WO2015037208A1 - 膨張弁 - Google Patents
膨張弁 Download PDFInfo
- Publication number
- WO2015037208A1 WO2015037208A1 PCT/JP2014/004490 JP2014004490W WO2015037208A1 WO 2015037208 A1 WO2015037208 A1 WO 2015037208A1 JP 2014004490 W JP2014004490 W JP 2014004490W WO 2015037208 A1 WO2015037208 A1 WO 2015037208A1
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- WIPO (PCT)
- Prior art keywords
- diaphragm
- fluid
- expansion
- expansion valve
- uniaxial center
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/002—Actuating devices; Operating means; Releasing devices actuated by temperature variation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/33—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant
- F25B41/335—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant via diaphragms
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/185—Control of temperature with auxiliary non-electric power
- G05D23/1852—Control of temperature with auxiliary non-electric power with sensing element expanding and contracting in response to change of temperature
Definitions
- the present disclosure relates to an expansion valve that decompresses a fluid.
- Patent Document 1 discloses an expansion valve having a power element in which two diaphragms are stacked and the peripheral edges of each diaphragm are joined over the entire circumference.
- a fluid sealed space in which a sealed fluid is sealed is formed between two diaphragms.
- Patent Document 1 Since the expansion valve of Patent Document 1 is provided with two diaphragms, in order to obtain a predetermined deformation amount of the power element with respect to the temperature change of the sealed fluid, the deformation amount per diaphragm compared to the one with one diaphragm. Can be reduced.
- Patent Document 2 discloses a first flow path having a decompression flow path for depressurizing the circulating fluid, and a uniaxial direction as the temperature of the sealed fluid increases as the sealed fluid is sealed.
- An expansion valve is disclosed that includes an expansion portion that expands and a flow rate adjustment portion that adjusts the flow rate of the circulating fluid in the first flow path in accordance with the expansion amount of the expansion portion.
- the expansion valve of Patent Document 2 includes a low pressure flow path as a second flow path through which the circulation fluid after being depressurized in the first flow path flows.
- the power element which is an expansion part is provided so that the temperature and pressure of the circulation fluid which flows through the low-pressure channel may be detected. And the fluid which mixed the some refrigerant
- the flow rate control characteristic of the flow rate control unit obtained by the expansion valve of Patent Document 2 for example, in the process of increasing the refrigerant temperature, the flow rate of the single refrigerant that is most likely to evaporate among a plurality of types of refrigerant sealed in the power element.
- the control characteristic becomes dominant.
- the flow rate control characteristic of the flow rate control unit is the flow rate control characteristic of a single refrigerant that is most likely to evaporate after the most easily evaporated refrigerant is vaporized. For this reason, the entire flow rate control characteristic of the flow rate adjusting unit is a combination of the flow rate control characteristics of individual refrigerants alone.
- the flow rate control characteristic of the flow rate control unit is a combination of characteristics obtained by using a power element enclosing a single refrigerant, that is, a single fluid, and the plurality of characteristics are connected. Since the inflection point is provided at the combined portion, it is difficult to obtain a flow control characteristic of the flow control unit arbitrarily determined.
- the flow rate control characteristic of the flow rate control unit is, for example, in Patent Document 2, the temperature and pressure in the low-pressure channel that is a boundary of whether or not the flow rate control unit flows the circulating fluid in the first channel. Expressed in relationship.
- this indication aims at providing the expansion valve with which it is easy to obtain arbitrarily the flow control characteristic of a flow control part.
- the expansion valve according to the first aspect of the present disclosure includes a first diaphragm and a second diaphragm laminated in the axial direction of a uniaxial center with respect to the first diaphragm, and the first diaphragm and the second diaphragm
- a first flow path having a decompression flow path for depressurizing the flow fluid and through which the flow fluid flows;
- a flow rate adjusting unit that adjusts the flow rate of the circulating fluid in the first flow path according to the deformation of the first diaphragm and the second diaphragm in the axial direction of the uniaxial center;
- the inflating part has an interposed member interposed between the first diaphragm and the second diaphragm,
- the fluid sealing space is formed
- the interposition member is interposed between the first diaphragm and the second diaphragm, thereby forming a fluid-filled space between the first diaphragm and the second diaphragm.
- the size of the fluid sealing space can be arbitrarily determined according to the shape of the interposed member such as the thickness. Therefore, it is possible to reduce the restriction caused by the shapes of the first diaphragm and the second diaphragm with respect to the size of the fluid sealing space.
- a first flow path having a decompression flow path for depressurizing the circulating fluid and flowing the circulating fluid;
- a first inflating part that expands in the axial direction of the uniaxial center as the temperature of the first fluid increases as the first fluid is enclosed;
- a second layer that is laminated in the axial direction of the uniaxial center with respect to the first inflating portion, and that expands in the axial direction of the uniaxial center as the temperature of the second fluid rises with the second fluid different from the first fluid enclosed
- An inflatable part And a flow rate adjusting unit that adjusts the flow rate of the circulating fluid in the first flow path according to the expansion of both the first expansion unit and the second expansion unit in the axial direction of the uniaxial center.
- the first fluid is enclosed in the first expansion part, and the second fluid different from the first fluid is enclosed in the second expansion part.
- the flow rate adjusting unit adjusts the flow rate of the circulating fluid in the first flow path according to the expansion of both the first expansion unit and the second expansion unit in the axial direction of the uniaxial center. Therefore, the flow rate control characteristic of the flow rate adjusting unit is generally intermediate between the flow rate control characteristic of only the first expansion unit and the flow rate control characteristic of only the second expansion unit, which is higher than that of the expansion valve of Patent Document 1. It is easy to arbitrarily obtain the flow rate control characteristic of the flow rate adjusting unit.
- FIG. 3 is a sectional view taken along the line III-III in FIG. 2. It is a figure for demonstrating the manufacturing process of the power element 34 shown by FIG. 2 and FIG. FIG. 2 is a cross-sectional view of the temperature type expansion valve 12 of FIG. 1, showing a state where the valve mechanism portion 32 maximizes the refrigerant passage area of the throttle passage 363, that is, a fully opened state of the first refrigerant passage 36. It is the expanded sectional view which expanded VI part of FIG. It is sectional drawing of the temperature type expansion valve 12 in 2nd Embodiment.
- FIG. 10 is a sectional view taken along line XX in FIG. 9. It is sectional drawing of the temperature type expansion valve 12 in 3rd Embodiment. It is the top view of the power element 50 seen from the uniaxial center CL1 direction in FIG.
- FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12 in the third embodiment. It is sectional drawing of the temperature type expansion valve 12 in 4th Embodiment.
- FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12 in the fourth embodiment.
- FIG. 13 is a sectional view taken along line XIII-XIII of FIG. 12 in the fifth embodiment. It is sectional drawing of the temperature type expansion valve 12 in 6th Embodiment. It is the top view of the power element 34 seen from the uniaxial center CL1 direction in FIG.
- FIG. 20 is a sectional view taken along line XX-XX in FIG. It is sectional drawing of the temperature type expansion valve 12 in 7th Embodiment. It is sectional drawing of the temperature type expansion valve 12 in 8th Embodiment. It is the top view of the 1st power element 34 seen from uniaxial center CL1 direction in FIG. FIG.
- FIG. 24 is a sectional view taken along line XXIV-XXIV in FIG. It is a figure for demonstrating the manufacturing process of the 1st power element 34 shown by FIG. 23 and FIG.
- FIG. 24 is a cross-sectional view of the temperature type expansion valve 12 of FIG. 23, showing a fully opened state of the first refrigerant passage 36 in which the valve mechanism 32 maximizes the refrigerant passage area of the throttle passage 363.
- the horizontal axis represents the flow rate control characteristic with the refrigerant temperature TL of the second refrigerant passage 38 and the vertical axis the refrigerant pressure PL of the second refrigerant passage 38. It is the expanded sectional view which expanded the XXVIII part of FIG.
- FIG. 31 is a sectional view taken along XXXI-XXXI in FIG. 30.
- FIG. 32 is a diagram for explaining a manufacturing process of the power element 48 shown in FIGS. 30 and 31.
- It is sectional drawing of the temperature type expansion valve 12 of 10th Embodiment. It is a 1st figure for demonstrating the manufacturing process of the power element 48 which the temperature type expansion valve 12 of FIG. 33 has. It is a 2nd figure for demonstrating the manufacturing process of the power element 48 which the temperature type expansion valve 12 of FIG.
- FIG. 33 has, Comprising: It is a figure which shows the manufacturing process following a 1st figure. It is the top view which looked at the power element 48 of FIG. 33 from the uniaxial center CL1 direction.
- FIG. 37 is a sectional view taken along the line XXXVII-XXXVII in FIG. 36. It is sectional drawing of the temperature type expansion valve 12 of 11th Embodiment. It is the top view which looked at the power element 50 of FIG. 38 from the uniaxial center CL1 direction.
- FIG. 40 is a cross-sectional view taken along the line XL-XL of FIG. 39 in the eleventh embodiment. It is sectional drawing of the temperature type expansion valve 12 of 12th Embodiment.
- FIG. 37 is a sectional view taken along the line XXXVII-XXXVII in FIG. 36.
- FIG. 40 is a cross-sectional view taken along the line XL-XL of FIG. 39 in the eleventh embodiment. It is sectional drawing
- FIG. 40 is a cross-sectional view taken along the line XL-XL of FIG. 39 in the twelfth embodiment. It is sectional drawing of the temperature type expansion valve 12 of 13th Embodiment.
- FIG. 40 is a cross-sectional view taken along the line XL-XL of FIG. 39 in the thirteenth embodiment. It is sectional drawing of the temperature type expansion valve 12 of 14th Embodiment. It is the top view which looked at the 1st power element 54 of Drawing 45 from uniaxial center CL1 direction.
- FIG. 47 is a sectional view taken along XLVII-XLVII in FIG. 46. It is sectional drawing of the temperature type expansion valve 12 of 15th Embodiment. It is the top view which looked at the power element 48 of FIG.
- FIG. 50 is a cross-sectional view taken along line LL in FIG. 49. It is sectional drawing of the temperature type expansion valve 12 of 16th Embodiment. It is sectional drawing which cut
- FIG. 1 is a cross-sectional view of a thermal expansion valve 12 that is an expansion valve in the present disclosure.
- the temperature type expansion valve 12 constitutes a part of a vapor compression refrigeration cycle 10 for a vehicle.
- FIG. 1 shows the connection relationship between the temperature type expansion valve 12 and each component of the vapor compression refrigeration cycle 10. Is also schematically illustrated.
- a chlorofluorocarbon refrigerant for example, R134a
- the vapor compression refrigeration cycle 10 constitutes a subcritical cycle in which the high-pressure side refrigerant pressure does not exceed the critical pressure of the refrigerant.
- the compressor 14 obtains driving force from a vehicle travel engine (not shown) via an electromagnetic clutch or the like, and sucks and compresses the refrigerant.
- the condenser 16 is a heat-dissipating heat exchanger that exchanges heat between the high-pressure refrigerant discharged from the compressor 14 and outside air that is outside air blown by a cooling fan (not shown) to dissipate and condense the high-pressure refrigerant. is there.
- the outlet side of the condenser 16 is connected to the temperature type expansion valve 12 via a receiver (not shown) that separates gas and liquid, for example.
- the temperature expansion valve 12 decompresses and expands the high-pressure refrigerant that has flowed out of the condenser 16, and the degree of superheat of the refrigerant that flows out of the evaporator is determined in advance based on the temperature and pressure of the refrigerant that flows out of the evaporator 18.
- the throttle passage area is changed so as to approach the determined value, and the flow rate of refrigerant flowing out to the inlet side of the evaporator 18 is adjusted.
- the detailed configuration of the temperature type expansion valve 12 will be described later.
- the evaporator 18 exchanges heat between the low-pressure refrigerant decompressed and expanded by the temperature type expansion valve 12 and the air blown by a blower fan (not shown), and evaporates the low-pressure refrigerant to exert a heat absorption effect. It is a vessel. Further, the outlet side of the evaporator 18 is connected to the suction side of the compressor 14 via a second refrigerant passage 38 formed inside the temperature type expansion valve 12.
- the temperature type expansion valve 12 includes a body part 30, a valve mechanism part 32, a power element 34, and the like.
- the body portion 30 constitutes an outer shell of the temperature type expansion valve 12 and a refrigerant passage in the temperature type expansion valve 12. For example, a drilling process is performed on a cylindrical or prismatic metal block made of an aluminum alloy or the like. It is formed by applying.
- the body part 30 is a housing that forms the outer shape of the temperature type expansion valve 12, and the body part 30 is formed with a first refrigerant passage 36, a second refrigerant passage 38, a valve chamber 40, and the like.
- the first refrigerant passage 36 is a first passage through which a refrigerant that is a circulation fluid flows, and is a passage provided to depressurize the refrigerant.
- the first refrigerant passage 36 has a first inlet 361 at one end and a first outlet 362 at the other end.
- the first inlet 361 is connected to the outlet side of the condenser 16, and the first outlet 362 is connected to the inlet side of the evaporator 18.
- the second refrigerant passage 38 is a flow passage through which the refrigerant flows, and is a second flow passage that is separate from the first refrigerant passage 36.
- the second refrigerant passage 38 has a second outlet 382 at one end and a second inlet 381 at the other end.
- the second inlet 381 is connected to the outlet side of the evaporator 18, and the second outlet 382 is connected to the suction side of the compressor 14.
- the valve chamber 40 is a space that is provided in the middle of the first refrigerant passage 36 and accommodates a spherical valve 321 of a valve mechanism portion 32 to be described later. Specifically, the valve chamber 40 communicates directly with the first inflow port 361 and communicates with the first outflow port 362 through the throttle passage 363.
- the throttle passage 363 constitutes a part of the first refrigerant passage 36, and is a decompression passage that decompresses the refrigerant by narrowing the refrigerant flow.
- the throttle passage 363 is a passage that guides the refrigerant flowing into the valve chamber 40 from the first inlet 361 from the valve chamber 40 side to the first outlet 362 side while decompressing and expanding.
- the valve mechanism portion 32 includes a spherical valve 321, a stopper 322, an operating rod 323, a vibration isolation spring 324, and a coil spring 325, and is accommodated in the body portion 30.
- the spherical valve 321, the stopper 322, the operating rod 323, the anti-vibration spring 324, and the coil spring 325 are disposed on the uniaxial center CL ⁇ b> 1, and the spherical valve 321 operates in the direction of the uniaxial center CL ⁇ b> 1.
- the valve mechanism unit 32 corresponds to the flow rate adjusting unit in the present disclosure.
- the spherical valve 321 is a valve body that adjusts the refrigerant passage area of the throttle passage 363 by being displaced in the direction of the uniaxial center CL1, that is, a valve body that adjusts the valve opening.
- the valve chamber 40 houses a vibration-proof spring 324 and a coil spring 325 together with the spherical valve 321.
- the anti-vibration spring 324 suppresses unnecessary vibration of the spherical valve 321 by sliding with respect to the valve chamber 40.
- the coil spring 325 applies a load for biasing the spherical valve 321 toward the valve closing side of the throttle passage 363 via the anti-vibration spring 324.
- FIG. 1 shows a state in which the valve mechanism 32 completely closes the throttle passage 363, that is, a fully closed state of the first refrigerant passage 36.
- the expansion valve 12 includes an adjustment screw 42 screwed into the body portion 30 so as to press the spherical valve 321 against the end portion of the throttle passage 363 via the coil spring 325.
- the load biased by the coil spring 325 against the spherical valve 321 can be adjusted by rotating the adjusting screw 42.
- An O-ring 421 is provided between the adjustment screw 42 and the body part 30, and the O-ring 421 prevents the refrigerant from flowing out of the valve chamber 40 to the outside of the expansion valve 12.
- the stopper 322 has, for example, a disk shape, and is in contact with the second diaphragm 342 of the power element 34 at a pressing surface 322a formed on one side in the direction of the uniaxial center CL1. The stopper 322 presses the second diaphragm 342 in the direction of the uniaxial center CL1 on the pressing surface 322a.
- the operating rod 323 has, for example, a cylindrical shape, and is interposed between the stopper 322 and the spherical valve 321. One end of the operating rod 323 is in contact with the stopper 322, and the other end of the operating rod 323 is inserted into the throttle passage 363 and abuts against the spherical valve 321.
- the spherical valve 321, the stopper 322, and the operating rod 323 correspond to the operating member of the present disclosure, and increase or decrease the refrigerant flow rate in the first refrigerant passage 36 by being displaced in the direction of the uniaxial center CL1.
- the O-ring 326 in which the operating rod 323 is inserted is held against the body part 30 by the retaining ring 327. The O-ring 326 prevents the refrigerant from flowing through the gap between the operating rod 323 and the body portion 30 between the first refrigerant passage 36 and the second refrigerant passage 38.
- the power element 34 is stacked on the stopper 322 and is housed in the housing space 44 formed in the body portion 30 together with the stopper 322. Specifically, the accommodation space 44 is formed by the body portion 30 and a lid member 46 that is fitted into the body portion 30 and is crimped. An O-ring 461 is provided between the lid member 46 and the body part 30, and the O-ring 461 prevents the refrigerant from flowing out of the storage space 44 to the outside of the expansion valve 12.
- the power element 34 corresponds to the expansion portion in the present disclosure.
- the lid member 46 constitutes a part of the accommodation space 44 and separates the power element 34 from the space outside the expansion valve 12.
- the lid member 46 is formed with a contact surface 46a that is in contact with the first diaphragm 341 of the power element 34 in the direction of the uniaxial center CL1.
- the lid member 46 presses the first diaphragm 341 in the direction of the uniaxial center CL1 at the contact surface 46a.
- the lid member 46 is preferably made of a material having excellent heat insulation performance, and is made of, for example, resin.
- the contact surface 46a is a fixed surface that cannot move in the direction of the uniaxial center CL1 because the lid member 46 is crimped and joined to the body portion 30.
- the power element 34 is sandwiched between the contact surface 46a of the lid member 46 and the pressing surface 322a of the stopper 322 in the uniaxial center CL1 direction, and is thereby held in the uniaxial center CL1 direction.
- the power element 34 is not restrained by the body portion 30 in the direction of the uniaxial center CL1, that is, the axial direction of the uniaxial center CL1, but has a clearance with the body portion 30 in the radial direction of the uniaxial center CL1.
- the movement of the power element 34 is restricted. That is, the power element 34 is movable in the radial direction within the accommodation space 44 within the clearance.
- the power element 34 includes disc-shaped first diaphragm 341 and second diaphragm 342, an annular interposed member 343, a flat and annular first collar 344, and a first collar 344. 2 colors 345.
- FIG. 2 is a plan view of the power element 34 viewed from the direction of the uniaxial center CL1. 3 is a cross-sectional view taken along the line III-III in FIG.
- the first diaphragm 341 and the second diaphragm 342 are composed of thin spring members and are laminated in the direction of the uniaxial center CL1.
- the first diaphragm 341 and the second diaphragm 342 bulge outward in the direction of the uniaxial center CL1 in accordance with the differential pressure between the internal pressure of the power element 34 and the pressure in the accommodation space 44 (see FIG. 1), and the power The element 34 opposes the pressing force from the coil spring 325.
- the central portions of the first diaphragm 341 and the second diaphragm 342 are displaced according to the differential pressure.
- 1 has the second refrigerant passage 38 so that the temperature and pressure in the accommodation space 44 are equal to those in the second refrigerant passage 38 regardless of the stroke position of the valve mechanism 32. Communicated with.
- the interposition member 343 is interposed between the first diaphragm 341 and the second diaphragm 342 in the direction of the uniaxial center CL1. Therefore, in the power element 34, a closed space 34a formed by being surrounded by the first diaphragm 341, the second diaphragm 342, and the interposition member 343 is provided between the first diaphragm 341 and the second diaphragm 342. ing.
- the closed space 34a is a greenhouse for sensing the refrigerant temperature in the second refrigerant passage 38, and corresponds to the fluid-filled space in the present disclosure.
- the interposition member 343 has an annular first contact surface 343a, and is in contact with the peripheral portion 341a of the first diaphragm 341 at the first contact surface 343a.
- the interposition member 343 has an annular second contact surface 343b on the opposite side in the direction of the uniaxial center CL1 with respect to the first contact surface 343a, and the second diaphragm 342 has a peripheral portion 342a.
- the second contact surface 343b is in contact therewith.
- the first contact surface 343a corresponds to the contact surface of the interposed member in the present disclosure.
- a fluid introduction path 343c for introducing a mixed fluid of a refrigerant and an inert gas into the closed space 34a is formed in the interposed member 343.
- a thin through hole penetrating in the radial direction of the interposed member 343 is formed as the fluid introduction path 343c.
- the fluid introduction path 343c is closed by a plug 346 after the mixed fluid is introduced into the closed space 34a. That is, this mixed fluid is a sealed fluid sealed in the closed space 34a.
- the temperature in the accommodation space 44 is transmitted to the mixed fluid in the closed space 34 a, and the temperature of the mixed fluid matches the temperature in the accommodation space 44.
- the pressure in the accommodation space 44 is a reaction force against the pressure of the mixed fluid, that is, a reaction force against the internal pressure of the power element 34.
- the first collar 344 is disposed on the opposite side to the interposed member 343 side in the direction of the uniaxial center CL1 with respect to the first diaphragm 341.
- the first collar 344 has a first color contact surface 344a and is in contact with the peripheral portion 341a of the first diaphragm 341 at the first color contact surface 344a. That is, the peripheral portion 341 a of the first diaphragm 341 is sandwiched between the first collar contact surface 344 a and the first contact surface 343 a of the interposition member 343.
- the first collar 344 corresponds to the color in the present disclosure
- the first color contact surface 344a corresponds to the color contact surface in the present disclosure.
- the second collar 345 is disposed on the opposite side to the interposed member 343 side in the direction of the uniaxial center CL1 with respect to the second diaphragm 342.
- the second collar 345 has a second color contact surface 345a and is in contact with the peripheral portion 342a of the second diaphragm 342 at the second color contact surface 345a. That is, the peripheral portion 342 a of the second diaphragm 342 is sandwiched between the second collar contact surface 345 a and the second contact surface 343 b of the interposition member 343.
- the power element 34 configured as described above is symmetrical in shape with respect to a virtual plane FCx passing through the center of the power element 34 and orthogonal to the uniaxial center CL1. Is made.
- the manufacturing process of the power element 34 will be described with reference to FIG. In FIG. 4, the manufacturing process sequentially proceeds from the state shown in (a) to the state shown in (e).
- the first collar 344, the first diaphragm 341, the interposition member 343, the second diaphragm 342, and the second collar 345 are sequentially laminated in the direction of the uniaxial center CL1.
- the second collar 345 and the interposition member 343 sandwiching the second diaphragm 342 are laser-welded, for example, over the entire circumference in the circumferential direction of the uniaxial center CL1. This laser welding is for joining with airtightness.
- the laser welded portion is indicated by a two-dot chain line in FIG. 4 and FIG. 3 described above.
- the interposition member 343 has a first diaphragm 341 that is radially outward of the uniaxial center CL ⁇ b> 1 from the inner peripheral end 343 d (see FIG. 6) of the first contact surface 343 a of the first contact surface 343 a.
- the first collar 344 is joined to the first diaphragm 341 by laser welding on the outer side in the radial direction of the uniaxial center CL1 than the inner peripheral end 344b (see FIG. 6) of the first collar contact surface 344a.
- the second diaphragm 342 is also joined to the interposed member 343 and the second collar 345 by laser welding in the same manner as the first diaphragm 341.
- a mixed fluid of the refrigerant and the inert gas is introduced from the fluid introduction path 343c into the closed space 34a.
- the refrigerant contained in the mixed fluid is, for example, a gas-liquid two-phase refrigerant.
- the refrigerant may be different from or the same as the refrigerant flowing through the second refrigerant passage 38.
- the fluid introduction path 343c is closed by the plug 346.
- the plug 346 is joined to the opening part of the fluid introduction path 343c in the state which obstruct
- FIG. 5 shows a state in which the valve mechanism portion 32 maximizes the refrigerant passage area of the throttle passage 363, that is, a fully opened state of the first refrigerant passage 36.
- the expansion valve 12 when the temperature of the refrigerant flowing through the second refrigerant passage 38 increases, the temperature in the accommodation space 44 and the temperature of the mixed fluid sealed in the closed space 34 a of the power element 34 also increase accordingly.
- the internal pressure of 34a becomes high. If the expansion force of the power element 34 due to the internal pressure overcomes the reaction force of the coil spring 325 or the like, the power element 34 expands in the direction of the uniaxial center CL1 as indicated by an arrow AR01 in FIG. Specifically, the first diaphragm 341 and the second diaphragm 342 swell outward in the direction of the uniaxial center CL1.
- the stopper 322 and the operating rod 323 are pushed by the second diaphragm 342 and moved as indicated by the arrow AR02.
- the spherical valve 321 is pushed by the operating rod 323 and moves as indicated by an arrow AR03. That is, the spherical valve 321 opens the throttle passage 363.
- the opening degree of the temperature type expansion valve 12 is adjusted by the balance between the load by which the power element 34 pushes the spherical valve 321 and the load by which the coil spring 325 pushes the spherical valve 321.
- the second diaphragm 342 is displaced in the direction of the uniaxial center CL1 with respect to the contact surface 46a, and at the same time, the second diaphragm 342 displaces the operating rod 323 in the direction of the uniaxial center CL1. Therefore, the total amount of deformation of the first diaphragm 341 and the amount of deformation of the second diaphragm 342 in the direction of the uniaxial center CL1 is the stroke amount of the operating rod 323. That is, the valve mechanism 32 adjusts the flow rate of the refrigerant in the first refrigerant passage 36 mechanically interlocked with the total deformation amount of the first diaphragm 341 and the deformation amount of the second diaphragm 342.
- FIG. 5 shows a state in which the stopper surface 322b has abutted against the abutting surface 30a. That is, the first refrigerant passage 36 is fully opened when the stopper surface 322b abuts against the abutting surface 30a.
- the interposition member 343 is interposed between the first diaphragm 341 and the second diaphragm 342, and thereby, between the first diaphragm 341 and the second diaphragm 342. Since the closed space 34a is formed, the size of the closed space 34a can be arbitrarily determined according to the shape such as the thickness of the interposed member 343. Therefore, it is possible to reduce the restriction caused by the shapes of the first diaphragm 341 and the second diaphragm 342 with respect to the size of the closed space 34a.
- the first contact surface 343a of the intervention member 343 has a first outer side in the radial direction of the uniaxial center CL1 than the inner peripheral end 343d (see FIG. 6) of the first contact surface 343a. It is bonded to one diaphragm 341.
- the first collar 344 is joined to the first diaphragm 341 by laser welding outside the inner peripheral end 344b (see FIG. 6) of the first collar contact surface 344a in the radial direction of the uniaxial center CL1.
- the first diaphragm 341 when the first diaphragm 341 is deformed, the first diaphragm 341 is bent with a position shifted with respect to the joint portion by welding of the first diaphragm 341 as a fulcrum, so that the stress concentration portion at the time of deformation of the first diaphragm 341 is separated from the joint portion.
- the durability of the first diaphragm 341 can be improved.
- the second diaphragm 342 is also joined to the interposition member 343 and the second collar 345 in the same manner as the joining configuration of the first diaphragm 341, the durability of the second diaphragm 342 is the same as the first diaphragm 341. Can also be improved.
- the interposing member 343 is formed with the fluid introduction path 343c for introducing the mixed fluid of the refrigerant and the inert gas into the closed space 34a. It is not necessary to form a communication hole corresponding to 343c in both the first diaphragm 341 and the second diaphragm 342. Therefore, it is easy to block the fluid introduction path 343c so that the mixed fluid does not leak.
- the power element 34 has a symmetrical outer shape with respect to the virtual plane FCx shown in FIG. Restrictions can be removed. Further, it is possible to make the parts common to the diaphragms 341 and 342 and the parts common to the collars 344 and 345.
- the power element 34 is not restrained in the direction of the uniaxial center CL1 by the body portion 30, and the first diaphragm 341 swells outward in the direction of the uniaxial center CL1. Since it is pressed against the contact surface 46a, the deformation amounts of both the first diaphragm 341 and the second diaphragm 342 can be used for the operation of the spherical valve 321. Therefore, it is possible to reduce the diameter of the power element 34 while ensuring a sufficient operation amount of the spherical valve 321.
- the power element 34 is separated from the space outside the expansion valve 12 and is accommodated in the body portion 30, so that the expansion valve 12 and a member disposed adjacent to the expansion valve 12 are disposed. It is possible to easily perform waterproofing treatment or sound insulation treatment with the like. Further, there is an advantage that the operation of the power element 34 is hardly affected by the outside air temperature around the expansion valve 12. Further, since the lid member 46 that separates the power element 34 from the space outside the expansion valve 12 is made of resin, the lid member 46 is less susceptible to the influence of the outside air temperature than the case where the lid member 46 is made of metal, for example. .
- FIG. 7 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the power element 34 is different from the temperature type expansion valve 12 of the first embodiment.
- the power element 34 of the present embodiment is the same in outer shape as the power element 34 of the first embodiment, but the first collar 344 (see FIG. 3) and the second collar in the first embodiment. 345 is integrated with the interposition member 343 and is configured by one interposition member 348.
- the manufacturing process of the power element 34 of the present embodiment will be described with reference to FIG. In FIG. 8, the manufacturing process proceeds sequentially from the state shown in (a) to the state shown in (g).
- the interposed member 348 includes an interposed part 348a, a first holding part 348b extending from the interposed part 348a, and a second holding part 348c extending from the interposed part 348a.
- the first clamping part 348b has a cylindrical shape protruding from the interposition part 348a in one direction in the direction of the uniaxial center CL1, and has an inner diameter into which the first diaphragm 341 can be fitted.
- the second sandwiching part 348c has a cylindrical shape protruding from the interposition part 348a to the other in the direction of the uniaxial center CL1, and has an inner diameter into which the second diaphragm 342 can be fitted.
- the first diaphragm 341 is fitted inside the first clamping portion 348b until the first diaphragm 341 contacts the interposed portion 348a, and at the same time, the second diaphragm 342 is inserted into the interposed portion 348a. It is inserted inside the second clamping part 348c until it abuts. Thereby, the interposition part 348a is interposed between the first diaphragm 341 and the second diaphragm 342.
- the first sandwiching portion 348b is bent radially inward.
- the 1st clamping part 348b opposes the interposed part 348a via the 1st diaphragm 341, and clamps the 1st diaphragm 341 with the interposed part 348a.
- the second clamping portion 348c is also bent radially inward.
- the 2nd clamping part 348c opposes the interposed part 348a via the 2nd diaphragm 342, and clamps the 2nd diaphragm 342 with the interposed part 348a.
- the first clamping part 348b corresponds to the first collar 344 of the first embodiment
- the second clamping part 348c corresponds to the second collar 345 of the first embodiment.
- FIGS. 8D to 8G are sequentially performed.
- the processes shown in FIGS. 8D to 8G are the same as those in FIGS. 4B to 4E of the first embodiment.
- FIG. 9 and FIG. 10 show the power element 34 manufactured through the steps shown in FIG. 8 (a) to FIG. 8 (g).
- FIG. 9 is a plan view of the power element 34 of the present embodiment viewed from the direction of the uniaxial center CL1.
- FIG. 10 is a sectional view taken along line XX of FIG.
- the power element 34 of the present embodiment is the same as that of the first embodiment in terms of the outer shape. And since this embodiment is the same as 1st Embodiment except the power element 34, the effect similar to 1st Embodiment can be acquired.
- the interposition member 348 includes the interposition section 348a, the first sandwiching section 348b, and the second sandwiching section 348c, so that the first collar 344 of the first embodiment described above and The second color 345 becomes unnecessary.
- the first diaphragm 341 is fitted inside the first sandwiching portion 348b, so that the first diaphragm 341 and the interposition member 348 are joined.
- the first diaphragm 341 and the interposition member 348 are joined.
- FIG. 11 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the power element 34 of the first embodiment is replaced with a power element 50.
- the arrangement of the stopper 322 and the length of the operating rod 323 are also different from those in the first embodiment.
- the power element 50 of the present embodiment corresponds to the power element 34 of the first embodiment, and is longer in the direction of the uniaxial center CL1 than the power element 34.
- the power element 50 of the present embodiment includes an interposed member 501 instead of the interposed member 343 of the first embodiment, and the interposed member 501 is longer than the interposed member 343. Yes.
- the power element 50 of this embodiment is provided with the shape as shown to FIG. 12 and FIG.
- FIG. 12 is a plan view of the power element 50 of this embodiment viewed from the direction of the uniaxial center CL1.
- 13 is a sectional view taken along line XIII-XIII in FIG.
- the power element 50 includes the first diaphragm 341, the second diaphragm 342, the first collar 344, and the second collar 345 in addition to the interposed member 501, as in the first embodiment. It has.
- the power element 50 corresponds to the inflating part in the present disclosure.
- the intervention member 501 includes a first joint 501a joined to the first diaphragm 341 by laser welding, a second joint 501b joined to the second diaphragm 342 by laser welding, a first joint 501a, and a second joint 501a. It is comprised from the constricted part 501c which comprised the cylindrical shape interposed between the junction parts 501b.
- the constricted portion 501c corresponds to the flow path arranging portion in the present disclosure.
- the power element 50 includes a closed space 50 a formed by being surrounded by the first diaphragm 341, the second diaphragm 342, and the interposed member 501, and the closed space 34 a of the first embodiment. It is formed in the same way.
- the closed space 50a is a fluid-filled space in which the above-described mixed fluid is sealed, like the closed space 34a.
- a fluid introduction path 343c for introducing the mixed fluid into the closed space 50a is formed in the second joint portion 501b, and the mixed fluid is introduced into the closed space 50a as in the first embodiment. Later it is plugged by a plug 346.
- the power element 50 is disposed so that the constricted portion 501 c of the interposed member 501 is positioned in the second refrigerant passage 38 across the refrigerant flow in the second refrigerant passage 38. .
- the refrigerant flowing through the second refrigerant passage 38 flows downstream while being in direct contact with the power element 50, so that the power element 50 operates with higher accuracy than the first embodiment in accordance with the refrigerant temperature in the second refrigerant passage 38. It is possible to make it.
- the power element 50 has a symmetrical shape with respect to the virtual plane FCx in the outer shape of the power element 50, similarly to the power element 34 of the first embodiment.
- This symmetrical shape means an approximate symmetrical shape rather than a strict shape, and the power element 50 is a symmetrical shape regardless of the presence or absence of a fine plug 346, for example.
- FIG. 14 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the power element 50 differs from the temperature type expansion valve 12 of 3rd Embodiment.
- a plan view of the power element 50 of this embodiment viewed from the direction of the uniaxial center CL1 is the same as FIG. 12 as in the third embodiment.
- the XIII-XIII sectional view of FIG. It is shown in FIG.
- the power element 50 of this embodiment further includes an adsorbent 502 and a pair of holding members 503 as compared with the third embodiment.
- the adsorbent 502 adsorbs or releases the refrigerant sealed in the closed space 50 a according to the temperature of the adsorbent 502.
- the adsorbent 502 is made of activated carbon or the like, for example, having poor thermal conductivity as compared to the interposed member 501.
- the adsorbent 502 is provided in a portion belonging to the constricted portion 501 c in the closed space 50 a of the power element 50.
- the arrangement position of the adsorbent 502 is held by the adsorbent 502 being sandwiched between the pair of holding members 503 in the direction of the uniaxial center CL1.
- the holding member 503 is a member having air permeability, and is made of, for example, a metal mesh or a filter.
- the adsorbent 502 is provided in the power element 50, the operation responsiveness of the power element 50 to the temperature change of the refrigerant flowing through the second refrigerant passage 38 is dulled, and the power element 50 is sensitive. Operation can be suppressed.
- FIG. 16 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the power element 50 differs from the temperature type expansion valve 12 of 3rd Embodiment.
- a plan view of the power element 50 of this embodiment viewed from the direction of the uniaxial center CL1 is the same as FIG. 12 as in the third embodiment.
- the XIII-XIII sectional view of FIG. FIG. 17 is obtained.
- the power element 50 of the present embodiment further includes a wall member 504 as compared with the third embodiment.
- the wall member 504 is made of a material having a lower thermal conductivity than the interposed member 501 made of metal, such as a resin, and is formed in a cylindrical shape. And it is inserted in the cylindrical constriction part 501c. Therefore, the inner peripheral surface 501d of the constricted portion 501c is covered with the wall member 504.
- the sensitive operation of the power element 50 is suppressed as in the fourth embodiment. be able to.
- FIG. 18 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the power element 34 differs with respect to the temperature type expansion valve 12 of 1st Embodiment.
- the first collar 344 and the second collar 345 are different from the first embodiment.
- FIGS. 19 and 20 Detailed views of the power element 34 shown in FIG. 18 are shown in FIGS. 19 and 20.
- FIG. 19 is a plan view of the power element 34 of the present embodiment as viewed from the direction of the uniaxial center CL1
- FIG. 20 is a sectional view taken along the line XX-XX in FIG.
- the first collar 344 includes a diaphragm pressing portion 344 c that is fixed by sandwiching the peripheral portion 341 a of the first diaphragm 341 with the interposition member 343, and the diaphragm pressing portion 344 c. And an extended portion 344d extending radially inward. This extending portion 344d corresponds to the limiting portion of the present disclosure.
- the diaphragm pressing portion 344c corresponds to the entire first collar 344 of the first embodiment. Therefore, the first collar 344 of the present embodiment extends to the first collar 344 of the first embodiment. A portion 344d is added.
- the central portion of the extending portion 344 d is a through-hole formed so as not to prevent the first diaphragm 341 from contacting the contact surface 46 a (see FIG. 18) of the lid member 46.
- a hole 344e is formed.
- the extending portion 344d of the first collar 344 is disposed so as to come into contact with the first diaphragm 341 when the first diaphragm 341 is expanded to some extent. And if the 1st diaphragm 341 expands until it contacts the extension part 344d, it will be restrict
- the extending portion 344d has a function of restricting deformation of the first diaphragm 341 so as to swell. Therefore, the deformation of the first diaphragm 341 can be suppressed so that the durability is not impaired.
- the deformation of the first diaphragm 341 is not suppressed by the lid member 46 and the stopper 322, so the extending portion 344 d This is particularly effective in such cases.
- the second collar 345 is the same as the first collar 344 described above. That is, the second collar 345 includes a diaphragm pressing portion 345c corresponding to the diaphragm pressing portion 344c of the first collar 344 and an extending portion 345d corresponding to the extending portion 344d of the first collar 344. A through hole 345e corresponding to the through hole 344e of the first collar 344 is formed in the extending portion 345d of the second collar 345.
- FIG. 21 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment. As shown in FIG. 21, the temperature type expansion valve 12 of this embodiment is different from the first embodiment in that it includes two power elements 34 that are the same as those in the first embodiment instead of one.
- the two power elements 34 are stacked in the direction of the uniaxial center CL1 so as to be in contact with each other, and are provided in the accommodation space 44. Specifically, the two power elements 34 are interposed between the contact surface 46a of the lid member 46 and the pressing surface 322a of the stopper 322 in the direction of the uniaxial center CL1.
- a working rod for the temperature change of the refrigerant flowing through the second refrigerant passage 38 as compared with the first embodiment described above.
- the stroke amount of 323 is increased, and the power element 34 can be easily reduced in diameter.
- the wall member 504 covers the inner peripheral surface 501d of the constricted portion 501c, but in addition to or instead of the inner peripheral surface 501d, The outer peripheral surface 501e of the constricted portion 501c may be covered.
- the fluid introduction path 343c is formed in the interposed members 343 and 501, but may be formed in other members.
- the first diaphragm 341 and the second diaphragm 342 are welded all around the interposed members 343 and 501, respectively, so that the airtightness of the power elements 34 and 50 is ensured. If the airtightness of the power elements 34 and 50 is ensured, the first diaphragm 341 and the second diaphragm 342 may be joined to the interposition members 343 and 501 by a method other than welding, respectively.
- the power elements 34 and 50 have a symmetric outer shape with respect to the virtual plane FCx, but they may not have a symmetric outer shape.
- the expansion valve 12 constitutes a part of the vapor compression refrigeration cycle 10, but it may be used for other purposes.
- the expansion valve 12 is configured such that the power elements 34 and 50 expand in accordance with the refrigerant temperature in the second refrigerant passage 38, but the refrigerant in the second refrigerant passage 38.
- the power elements 34 and 50 may be configured to expand at a temperature other than the temperature.
- the refrigerant that is the same fluid as the first refrigerant passage 36 flows through the second refrigerant passage 38, but the fluid that flows through the first refrigerant passage 36 flows through the second refrigerant passage 38. May be different fluids.
- the closed spaces 34a and 50a formed in the power elements 34 and 50 are a single space, but may be partitioned into a plurality of independent spaces. .
- the sealed fluid sealed in the closed spaces 34a and 50a of the power elements 34 and 50 is a mixed fluid in which a refrigerant and an inert gas are mixed, but only the refrigerant. There is no problem.
- the sealed fluid is not particularly limited as long as it is a fluid that expands in volume as the temperature rises.
- the lid member 46 side is called the first diaphragm 341 and the stopper 322 side is called the second diaphragm 342.
- the lid member 46 side may be referred to as the second diaphragm 342 and the stopper 322 side may be referred to as the first diaphragm 341.
- the two power elements 34 of the first embodiment are stacked in the direction of the uniaxial CL1, but for example, the power element 50 of the third embodiment is in the direction of the uniaxial CL1.
- Two layers may be stacked.
- the number of power elements 34 and 50 stacked may be three or more.
- the plurality of stacked power elements may have different shapes.
- FIG. 22 is a cross-sectional view of the temperature type expansion valve 12 which is an expansion valve in the present disclosure.
- the temperature type expansion valve 12 constitutes a part of the vapor compression refrigeration cycle 10 for a vehicle, and FIG. 22 shows the connection relationship between the temperature type expansion valve 12 and each component of the vapor compression refrigeration cycle 10. Is also schematically illustrated.
- a chlorofluorocarbon refrigerant for example, R134a
- the vapor compression refrigeration cycle 10 constitutes a subcritical cycle in which the high-pressure side refrigerant pressure does not exceed the critical pressure of the refrigerant.
- the compressor 14 obtains a driving force from a vehicle travel engine (not shown) via an electromagnetic clutch or the like, and sucks and compresses the refrigerant.
- the condenser 16 is a heat-dissipating heat exchanger that exchanges heat between the high-pressure refrigerant discharged from the compressor 14 and outside air that is outside air blown by a cooling fan (not shown) to dissipate and condense the high-pressure refrigerant. is there.
- the outlet side of the condenser 16 is connected to the temperature type expansion valve 12 via a receiver (not shown) that separates gas and liquid, for example.
- the temperature expansion valve 12 decompresses and expands the high-pressure refrigerant that has flowed out of the condenser 16, and the degree of superheat of the refrigerant that flows out of the evaporator is determined in advance based on the temperature and pressure of the refrigerant that flows out of the evaporator 18.
- the throttle passage area is changed so as to approach the determined value, and the flow rate of refrigerant flowing out to the inlet side of the evaporator 18 is adjusted.
- the detailed configuration of the temperature type expansion valve 12 will be described later.
- the evaporator 18 exchanges heat between the low-pressure refrigerant decompressed and expanded by the temperature type expansion valve 12 and the air blown by a blower fan (not shown), and evaporates the low-pressure refrigerant to exert a heat absorption effect. It is a vessel. Further, the outlet side of the evaporator 18 is connected to the suction side of the compressor 14 via a second refrigerant passage 38 formed inside the temperature type expansion valve 12.
- the temperature type expansion valve 12 includes a body part 30, a valve mechanism part 32, a first power element 34, a second power element 35, and the like.
- corresponds to the 1st expansion part in this indication
- corresponds to the 2nd expansion part in this indication.
- the body portion 30 constitutes an outer shell of the temperature type expansion valve 12 and a refrigerant passage in the temperature type expansion valve 12. For example, a drilling process is performed on a cylindrical or prismatic metal block made of an aluminum alloy or the like. It is formed by applying.
- the body part 30 is a housing that forms the outer shape of the temperature type expansion valve 12, and the body part 30 is formed with a first refrigerant passage 36, a second refrigerant passage 38, a valve chamber 40, and the like.
- the first refrigerant passage 36 is a first passage through which a refrigerant that is a circulation fluid flows, and is a passage provided to depressurize the refrigerant.
- the first refrigerant passage 36 has a first inlet 361 at one end and a first outlet 362 at the other end.
- the first inlet 361 is connected to the outlet side of the condenser 16, and the first outlet 362 is connected to the inlet side of the evaporator 18.
- the second refrigerant passage 38 is a flow passage through which the refrigerant flows, and is a second flow passage that is separate from the first refrigerant passage 36.
- the second refrigerant passage 38 has a second outlet 382 at one end and a second inlet 381 at the other end.
- the second inlet 381 is connected to the outlet side of the evaporator 18, and the second outlet 382 is connected to the suction side of the compressor 14.
- the valve chamber 40 is a space that is provided in the middle of the first refrigerant passage 36 and accommodates a spherical valve 321 of a valve mechanism portion 32 to be described later. Specifically, the valve chamber 40 communicates directly with the first inflow port 361 and communicates with the first outflow port 362 through the throttle passage 363.
- the throttle passage 363 constitutes a part of the first refrigerant passage 36, and is a decompression passage that decompresses the refrigerant by narrowing the refrigerant flow.
- the throttle passage 363 is a passage that guides the refrigerant flowing into the valve chamber 40 from the first inlet 361 from the valve chamber 40 side to the first outlet 362 side while decompressing and expanding.
- the valve mechanism portion 32 includes a spherical valve 321, a stopper 322, an operating rod 323, a vibration isolation spring 324, and a coil spring 325, and is accommodated in the body portion 30.
- the spherical valve 321, the stopper 322, the operating rod 323, the anti-vibration spring 324, and the coil spring 325 are disposed on the uniaxial center CL ⁇ b> 1, and the spherical valve 321 operates in the direction of the uniaxial center CL ⁇ b> 1.
- the valve mechanism unit 32 corresponds to the flow rate adjusting unit in the present disclosure.
- the spherical valve 321 is a valve body that adjusts the refrigerant passage area of the throttle passage 363 by being displaced in the direction of the uniaxial center CL1, that is, a valve body that adjusts the valve opening.
- the valve chamber 40 houses a vibration-proof spring 324 and a coil spring 325 together with the spherical valve 321.
- the anti-vibration spring 324 suppresses unnecessary vibration of the spherical valve 321 by sliding with respect to the valve chamber 40.
- the coil spring 325 applies a load for biasing the spherical valve 321 toward the valve closing side of the throttle passage 363 via the anti-vibration spring 324.
- FIG. 22 shows a state where the valve mechanism 32 completely closes the throttle passage 363, that is, a fully closed state of the first refrigerant passage 36.
- the expansion valve 12 includes an adjustment screw 42 screwed into the body portion 30 so as to press the spherical valve 321 against the end portion of the throttle passage 363 via the coil spring 325.
- the load biased by the coil spring 325 against the spherical valve 321 can be adjusted by rotating the adjusting screw 42.
- An O-ring 421 is provided between the adjustment screw 42 and the body part 30, and the O-ring 421 prevents the refrigerant from flowing out of the valve chamber 40 to the outside of the expansion valve 12.
- the stopper 322 has, for example, a disk shape, and is in contact with the fourth diaphragm 352 of the second power element 35 with a pressing surface 322a formed on one side in the direction of the uniaxial center CL1. The stopper 322 presses the fourth diaphragm 352 in the direction of the uniaxial center CL1 at the pressing surface 322a.
- the operating rod 323 has, for example, a cylindrical shape, and is interposed between the stopper 322 and the spherical valve 321. One end of the operating rod 323 is in contact with the stopper 322, and the other end of the operating rod 323 is inserted into the throttle passage 363 and abuts against the spherical valve 321.
- the spherical valve 321, the stopper 322, and the operating rod 323 are operating members that operate in the valve mechanism 32, and increase or decrease the refrigerant flow rate in the first refrigerant passage 36 by being displaced in the direction of the uniaxial center CL ⁇ b> 1.
- the O-ring 326 in which the operating rod 323 is inserted is held against the body part 30 by the retaining ring 327. The O-ring 326 prevents the refrigerant from flowing through the gap between the operating rod 323 and the body portion 30 between the first refrigerant passage 36 and the second refrigerant passage 38.
- the first power element 34 is stacked in the direction of the uniaxial center CL1 with respect to the second power element 35 and the stopper 322, and is housed in the housing space 44 formed in the body portion 30 together with the second power element 35 and the stopper 322. ing.
- the accommodation space 44 is formed by the body portion 30 and a lid member 46 that is fitted into the body portion 30 and is crimped.
- An O-ring 461 is provided between the lid member 46 and the body part 30, and the O-ring 461 prevents the refrigerant from flowing out of the storage space 44 to the outside of the expansion valve 12.
- the lid member 46 constitutes a part of the accommodation space 44 and separates the first power element 34 and the second power element 35 from the space outside the expansion valve 12.
- the lid member 46 is formed with a contact surface 46a that is in contact with the first diaphragm 341 of the first power element 34 in the direction of the uniaxial center CL1.
- the lid member 46 presses the first diaphragm 341 in the direction of the uniaxial center CL1 at the contact surface 46a.
- the lid member 46 is preferably made of a material having excellent heat insulation performance, and is made of, for example, resin.
- the contact surface 46a is a fixed surface that cannot move in the direction of the uniaxial center CL1 because the lid member 46 is crimped and joined to the body portion 30.
- the first power element 34 is adjacent to the lid member 46 side of the second power element 35 in the direction of the uniaxial center CL1, and together with the second power element 35, the contact surface 46a of the lid member 46 and the pressing surface 322a of the stopper 322 are formed. It is sandwiched between. Thus, the first power element 34 and the second power element 35 are integrally held in the direction of the uniaxial center CL1.
- the first power element 34 and the second power element 35 are not restrained by the body portion 30 in the direction of the uniaxial center CL1, that is, the axial direction of the uniaxial center CL1, but in the radial direction of the uniaxial center CL1
- the movement of the first power element 34 and the second power element 35 is restricted with a clearance between the first power element 34 and the second power element 35. That is, the first power element 34 and the second power element 35 are movable in the radial direction within the accommodation space 44 within the clearance.
- the first power element 34 includes a disk-shaped first diaphragm 341 and a second diaphragm 342, an annular interposed member 343, a flat plate and an annular first collar 344. And a second collar 345.
- FIG. 23 is a plan view of the first power element 34 viewed from the direction of the uniaxial center CL1. 24 is a cross-sectional view taken along the line XXIV-XXIV in FIG.
- the first diaphragm 341 and the second diaphragm 342 are composed of thin spring members and are laminated in the direction of the uniaxial center CL1.
- the first diaphragm 341 and the second diaphragm 342 bulge outward in the direction of the uniaxial center CL1 in accordance with the differential pressure between the internal pressure of the first power element 34 and the pressure in the accommodation space 44 (see FIG. 22).
- the first power element 34 resists the pressing force from the coil spring 325.
- the central portions of the first diaphragm 341 and the second diaphragm 342 are displaced according to the differential pressure.
- the storage space 44 shown in FIG. 22 has a second refrigerant passage 38 so that the temperature and pressure in the storage space 44 are equal to those in the second refrigerant passage 38 regardless of the stroke position of the valve mechanism 32. Communicated with.
- the interposed member 343 is interposed between the first diaphragm 341 and the second diaphragm 342 in the direction of the uniaxial center CL1. Therefore, the first power element 34 includes a first closed space 34 a formed by being surrounded by the first diaphragm 341, the second diaphragm 342, and the interposition member 343, and the first diaphragm 341 and the second diaphragm 342. It is provided in between. That is, the interposition member 343 forms the first closed space 34a by being joined to the first diaphragm 341 and the second diaphragm 342, respectively.
- the first closed space 34a is a temperature sensitive room for the first power element 34 that senses the refrigerant temperature in the second refrigerant passage 38, and corresponds to the enclosed space in the present disclosure.
- the interposition member 343 has an annular first contact surface 343a, and is in contact with the peripheral portion 341a of the first diaphragm 341 at the first contact surface 343a.
- the interposition member 343 has an annular second contact surface 343b on the opposite side in the direction of the uniaxial center CL1 with respect to the first contact surface 343a, and the second diaphragm 342 has a peripheral portion 342a.
- the second contact surface 343b is in contact therewith.
- the first fluid is, for example, a fluid obtained by mixing the same kind of refrigerant that flows through the second refrigerant passage 38 and an inert gas. That is, the first power element 34 is a normal charge element.
- a thin through hole penetrating in the radial direction of the interposed member 343 is formed in the interposed member 343 as a fluid introduction path 343c.
- the fluid introduction path 343c is closed by a plug 346 after the first fluid is introduced into the first closed space 34a. That is, the first fluid is enclosed in the first closed space 34a.
- the internal pressure of the first closed space 34a rises, and the first diaphragm 341 and the second diaphragm 342 swell outward in the direction of the uniaxial center CL1, respectively. Expands in the direction of the uniaxial center CL1.
- the temperature in the storage space 44 is transmitted to the first fluid in the first closed space 34a, and the temperature of the first fluid matches the temperature in the storage space 44. Further, the pressure in the accommodation space 44 becomes a reaction force against the pressure of the first fluid, that is, a reaction force against the internal pressure of the first power element 34.
- the first collar 344 is disposed on the opposite side to the interposed member 343 side in the direction of the uniaxial center CL1 with respect to the first diaphragm 341.
- the first collar 344 has a first color contact surface 344a and is in contact with the peripheral portion 341a of the first diaphragm 341 at the first color contact surface 344a. That is, the peripheral portion 341 a of the first diaphragm 341 is sandwiched between the first collar contact surface 344 a and the first contact surface 343 a of the interposition member 343.
- the first collar 344 corresponds to the color in the present disclosure
- the first color contact surface 344a corresponds to the color contact surface in the present disclosure.
- the second collar 345 is disposed on the opposite side to the interposed member 343 side in the direction of the uniaxial center CL1 with respect to the second diaphragm 342.
- the second collar 345 has a second color contact surface 345a and is in contact with the peripheral portion 342a of the second diaphragm 342 at the second color contact surface 345a. That is, the peripheral portion 342 a of the second diaphragm 342 is sandwiched between the second collar contact surface 345 a and the second contact surface 343 b of the interposition member 343.
- the first power element 34 configured as described above has an outer shape with respect to a virtual plane FCx passing through the center of the first power element 34 and orthogonal to the uniaxial center CL1. It has a symmetrical shape.
- the manufacturing process of the first power element 34 will be described with reference to FIG. In FIG. 25, the manufacturing process sequentially proceeds from the state shown in (a) to the state shown in (e).
- the first collar 344, the first diaphragm 341, the interposition member 343, the second diaphragm 342, and the second collar 345 are sequentially laminated in the direction of the uniaxial center CL1.
- the second collar 345 and the interposition member 343 sandwiching the second diaphragm 342 are laser-welded, for example, over the entire circumference in the circumferential direction of the uniaxial center CL1. This laser welding is for joining with airtightness.
- This laser welded portion is indicated by a two-dot chain line in FIG. 25 and FIG. 24 described above.
- the first contact surface 343a of the interposition member 343 has a first diaphragm on the radially outer side of the uniaxial center CL1 with respect to the inner peripheral end 343d (see FIG. 28) of the first contact surface 343a.
- 341 is joined by laser welding.
- the first collar 344 is joined to the first diaphragm 341 by laser welding on the radially outer side of the uniaxial center CL1 with respect to the inner peripheral end 344b (see FIG. 28) of the first collar contact surface 344a.
- the second diaphragm 342 is also joined to the interposed member 343 and the second collar 345 by laser welding in the same manner as the first diaphragm 341.
- the first fluid composed of the refrigerant and the inert gas is introduced into the first closed space 34a from the fluid introduction path 343c.
- the fluid introduction path 343c is closed by the plug 346.
- the plug 346 is joined to the opening part of the fluid introduction path 343c in the state which obstruct
- the second power element 35 shown in FIG. 22 is the same as the first power element 34 described above, except for the sealed fluid.
- the one corresponding to the first diaphragm 341 is called a third diaphragm 351
- the one corresponding to the second diaphragm 342 is called a fourth diaphragm 352.
- the one corresponding to the first closed space 34a is referred to as a second closed space 35a.
- those reference numerals 35, 351, 352, and 35a are displayed in parentheses.
- a second fluid obtained by mixing a different refrigerant and an inert gas with respect to the refrigerant contained in the first fluid. It is enclosed.
- the refrigerant contained in the first fluid and the refrigerant contained in the second fluid are different from each other in the saturation temperature characteristic that is the relationship between the saturation vapor pressure and the saturation temperature.
- Each of the refrigerant contained in the first fluid and the second fluid is a gas-liquid two-phase refrigerant.
- the amount of change in the saturation vapor pressure with respect to the change in saturation temperature is smaller than that in the refrigerant flowing through the second refrigerant passage 38. That is, the second power element 35 is a cross charge element.
- the internal pressure of the second closed space 35a increases in the second power element 35 in the direction of the uniaxial center CL1 as the temperature of the second fluid increases. Inflates to.
- the third diaphragm 351 of the second power element 35 is in contact with and in contact with the second diaphragm 342 of the first power element 34 in the direction of the uniaxial center CL1.
- FIG. 26 shows a state where the valve mechanism portion 32 maximizes the refrigerant passage area of the throttle passage 363, that is, a fully opened state of the first refrigerant passage 36.
- the expansion valve 12 when the temperature of the refrigerant flowing through the second refrigerant passage 38 rises, the temperature in the accommodation space 44, the temperature of the first fluid sealed in the first closed space 34a, and the second closed space 35a are accordingly increased.
- the temperature of the 2nd fluid enclosed in the inside also rises and the internal pressure of the 1st closed space 34a and the 2nd closed space 35a becomes high, respectively.
- the expansion force of the first power element 34 and the second power element 35 due to the internal pressure overcomes the reaction force of the coil spring 325 or the like, the first power element 34 and the second power element 34 as indicated by arrows AR01 and AR02 in FIG.
- the power element 35 expands in the direction of the uniaxial center CL1.
- the first diaphragm 341 and the second diaphragm 342 are respectively expanded outward in the direction of the uniaxial center CL1, and in the second power element 35, the third diaphragm 351 and the fourth diaphragm 352 are formed. Each swells outward in the direction of the uniaxial center CL1.
- the stopper 322 and the operating rod 323 are pushed by the fourth diaphragm 352 and move as indicated by the arrow AR03.
- the spherical valve 321 is pushed by the operating rod 323 and moves as indicated by an arrow AR04. That is, the spherical valve 321 opens the throttle passage 363.
- the valve opening of the temperature type expansion valve 12 is adjusted by the balance between the load by which the first power element 34 pushes the spherical valve 321 and the load by which the coil spring 325 pushes the spherical valve 321.
- the second diaphragm 342 is displaced in the direction of the uniaxial center CL1 with respect to the contact surface 46a,
- the second diaphragm 342 displaces the second power element 35 in the direction of the uniaxial center CL1.
- the third diaphragm 351 of the second power element 35 displaces the fourth diaphragm 352 relative to the second diaphragm 342 in the direction of the uniaxial center CL1, and the fourth diaphragm 352 moves the operating rod 323 in the direction of the uniaxial center CL1. Displace.
- the valve mechanism 32 adjusts the flow rate of the refrigerant in the first refrigerant passage 36 in accordance with the sum of the expansion amount of the first power element 34 and the expansion amount of the second power element 35.
- FIG. 26 shows a state in which the stopper surface 322b has abutted against the abutting surface 30a. That is, the first refrigerant passage 36 is fully opened when the stopper surface 322b abuts against the abutting surface 30a.
- the first power element 34 is sealed with the first fluid
- the second power element 35 is sealed with the second fluid different from the first fluid.
- the part 32 adjusts the refrigerant flow rate in the first refrigerant passage 36 according to the expansion of both the first power element 34 and the second power element 35 in the direction of the uniaxial center CL1. Therefore, as a whole, the flow rate control characteristic of the valve mechanism portion 32 is the first flow rate control characteristic by only the first power element 34 enclosing the first fluid and the second flow element 35 by only the second power element 35 enclosing the second fluid. Therefore, it is easy to obtain the flow control characteristic of the valve mechanism 32 arbitrarily. This will be described in detail with reference to FIG.
- FIG. 27 is a diagram showing flow rate control characteristics in which the horizontal axis represents the refrigerant temperature TL of the second refrigerant passage 38 and the vertical axis represents the refrigerant pressure PL of the second refrigerant passage 38.
- the flow rate control characteristic is a relationship between the refrigerant pressure PL and the refrigerant temperature TL in the second refrigerant passage 38 that is a boundary of whether or not the valve mechanism portion 32 opens the first refrigerant passage 36. That is, if the actual refrigerant pressure PL in the second refrigerant passage 38 is less than the pressure obtained from the flow control characteristic, the first refrigerant passage 36 is blocked, while if the pressure obtained from the flow control characteristic is exceeded.
- the first refrigerant passage 36 can be circulated.
- a two-dot chain line Ls shown in FIG. 27 represents the saturation temperature characteristic of the refrigerant in the second refrigerant passage 38.
- a solid line Lm represents the flow control characteristic of the valve mechanism 32 in the present embodiment.
- a broken line LA represents the flow rate control characteristic of the valve mechanism 32, that is, the first flow rate control characteristic when it is assumed that the first fluid is sealed in the second power element 35 instead of the second fluid. That is, the first flow rate control characteristic indicated by the broken line LA is a characteristic when it is assumed that the first fluid is sealed in both the first power element 34 and the second power element 35.
- the alternate long and short dash line LB represents the flow rate control characteristic of the valve mechanism 32, that is, the second flow rate control characteristic when it is assumed that the second fluid is sealed in the first power element 34 instead of the first fluid. That is, the second flow rate control characteristic indicated by the alternate long and short dash line LB is a characteristic when it is assumed that the second fluid is sealed in both the first power element 34 and the second power element 35.
- the first power element 34 enclosing the first fluid and the second power element 35 enclosing the second fluid are arranged in series in the direction of the uniaxial center CL1 and are encapsulated.
- the flow rate control characteristic of the present embodiment indicated by the solid line Lm is a characteristic having an intermediate slope between the first flow rate control characteristic indicated by the broken line LA and the second flow rate control characteristic indicated by the alternate long and short dash line LB. Therefore, by arbitrarily selecting one or both of the first fluid and the second fluid, it is possible to set the flow control characteristic indicated by the solid line Lm so as to have a desired gradient.
- the first flow rate control characteristic and the second flow rate control characteristic are as shown by the solid line Lm in FIG. It is possible to obtain a smooth flow rate control characteristic in which there is no inflection point except for MOP (maximum operating pressure). Therefore, stable control of the valve mechanism 32 can be performed.
- the first contact surface 343a of the intervention member 343 has a first outer side in the radial direction of the uniaxial center CL1 than the inner peripheral end 343d (see FIG. 28) of the first contact surface 343a. It is bonded to one diaphragm 341.
- the first collar 344 is joined to the first diaphragm 341 by laser welding outside the inner peripheral end 344b (see FIG. 28) of the first collar contact surface 344a in the radial direction of the uniaxial center CL1.
- the first diaphragm 341 when the first diaphragm 341 is deformed, the first diaphragm 341 is bent with a position shifted with respect to the joint portion by welding of the first diaphragm 341 as a fulcrum, so that the stress concentration portion at the time of deformation of the first diaphragm 341 is separated from the joint portion.
- the durability of the first diaphragm 341 can be improved.
- the second diaphragm 342 is also sandwiched and joined between the interposition member 343 and the second collar 345, so that the second diaphragm 342 is similar to the first diaphragm 341.
- the durability of 342 can also be improved. The same applies to the diaphragms 351 and 352 of the second power element 35.
- the fluid introduction path 343c for introducing the first fluid into the first closed space 34a is formed in the interposed member 343, it corresponds to the fluid introduction path 343c. There is no need to form communication holes in the first diaphragm 341 and the second diaphragm 342. Therefore, it is easy to block the fluid introduction path 343c so that the first fluid does not leak.
- the first power element 34 has a symmetrical outer shape with respect to the virtual plane FCx shown in FIG. 24, and therefore the first power element 34 in the direction of the uniaxial center CL1.
- the restriction of the assembly direction can be eliminated.
- first power element 34 and the second power element 35 are the same except for the sealed fluid, the arrangement order in the direction of the uniaxial center CL1 can be reversed. The restriction on the assembly order of the power element 34 and the second power element 35 can be eliminated.
- the 1st power element 34 and the 2nd power element 35 are arrange
- the first power element 34 and the second power element 35 are separated from the space outside the expansion valve 12 and are accommodated in the body portion 30. It is possible to easily perform waterproofing between the member and the like disposed adjacent to the member. Further, there is an advantage that the operation of the first power element 34 and the operation of the second power element 35 are hardly affected by the outside air temperature around the expansion valve 12. Further, since the lid member 46 that separates the first power element 34 and the second power element 35 from the space outside the expansion valve 12 is made of resin, compared to the case where the lid member 46 is made of metal, for example, Furthermore, it is hard to be affected by the outside temperature.
- the interposition member 343 is interposed between the first diaphragm 341 and the second diaphragm 342, whereby the first diaphragm 341 and the second diaphragm 342 are disposed. Since the closed space 34a is formed between them, the size of the closed space 34a can be arbitrarily determined according to the shape such as the thickness of the interposed member 343. Therefore, it is possible to reduce the restriction caused by the shapes of the first diaphragm 341 and the second diaphragm 342 with respect to the size of the closed space 34a. The same applies to the second power element 35.
- FIG. 29 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the temperature type expansion valve 12 of the present embodiment is different from the temperature type expansion valve 12 of the eighth embodiment in that only one power element 48 is provided.
- the power element 48 of FIG. 29 is different from the first power element 34 of the eighth embodiment in that it includes two independent closed spaces 48a and 48b, that is, sensitive chambers 48a and 48b.
- the power element 48 of the present embodiment will be described mainly with respect to differences from the first power element 34 of the eighth embodiment.
- FIG. 30 is a plan view of the power element 48 of this embodiment as viewed from the direction of the uniaxial center CL1.
- FIG. 31 is a sectional view taken along the line XXXI-XXXI in FIG.
- the power element 48 includes an interposed member 481 instead of the interposed member 343 of the eighth embodiment.
- the interposed member 481 is provided with a partition wall 481b that divides the hole 481a in the interposed member 481 in the direction of the uniaxial center CL1 in the direction of the uniaxial center CL1. Therefore, the power element 48 is formed with a first closed space 48a and a second closed space 48b arranged in the direction of the uniaxial center CL1 via the partition wall 481b.
- the first closed space 48a is a first enclosed space in which a first fluid is enclosed
- the second closed space 48b is a second enclosed space in which a second fluid is enclosed.
- the power element 48 includes a first expansion portion 482 that expands in the direction of the uniaxial center CL1 when the first diaphragm 341 expands outward, and a uniaxial center CL1 that expands the second diaphragm 342 outward. And a second expansion portion 484 that expands in the direction. And the 1st expansion part 482 and the 2nd expansion part 484 have the partition 481b in common, and are adjacent to uniaxial center CL1 direction.
- the first expansion portion 482 includes a first diaphragm 341, a first space forming portion 481 c, and a first collar 344.
- the first space forming portion 481c is configured by a portion of the interposed member 481 on the first diaphragm 341 side with respect to the partition wall 481b.
- the first space forming portion 481c is joined to the first diaphragm 341, whereby the first fluid is sealed on the second diaphragm 342 side in the direction of the uniaxial center CL1 with respect to the first diaphragm 341.
- a space 48a is formed.
- the second expansion portion 484 includes a second diaphragm 342, a second space forming portion 481d, and a second collar 345.
- the second space forming portion 481d is configured by a portion on the second diaphragm 342 side of the interposed member 481 with respect to the partition wall 481b.
- the first space forming portion 481c is integrated with the first space forming portion 481c and is disposed between the first space forming portion 481c and the second diaphragm 342.
- the second space forming portion 481d is joined to the second diaphragm 342, whereby the second closed space in which the second fluid is sealed on the first diaphragm 341 side of the second diaphragm 342 in the direction of the uniaxial center CL1. 48b is formed.
- the first expansion portion 482 is formed with a first fluid introduction path 481e for introducing the first fluid into the first closed space 48a.
- the first fluid introduction path 481e is closed by a plug 346.
- the second inflating portion 484 is formed with a second fluid introduction path 481f for introducing the second fluid into the second closed space 48b.
- the second fluid introduction path 481f is closed by a plug 346.
- the power element 48 configured as described above is symmetric with respect to a virtual plane FCx passing through the center of the power element 48 and orthogonal to the uniaxial center CL1, similarly to the first power element 34 of the eighth embodiment. It has a typical external shape.
- FIG. 32 is a view corresponding to FIG. 25 of the eighth embodiment.
- the steps shown in FIGS. 32 (a), (b), (e) to (g) are the same as FIGS. 25 (a) to (e), respectively.
- the same. 32 (c) and 32 (d) show steps added to FIG. Accordingly, FIGS. 32C and 32D will be described.
- the arrow AR1in in FIG. 32 (e) means the same as the arrow ARin in FIG. 25 (c)
- the arrow AR1c in FIG. 32 (f) means the same as the arrow ARc in FIG. 25 (d). is doing.
- the second fluid is introduced into the second closed space 48b from the second fluid introduction path 481f as indicated by an arrow AR2in.
- the second fluid introduction path 481f is closed by the plug 346.
- the plug 346 is joined to the opening part of the 2nd fluid introduction path 481f in the state which obstruct
- the second fluid introduction path 481f is closed, whereby the second fluid is sealed in the second closed space 48b.
- the first fluid introduction path 481e is temporarily closed by the closing jig 92 as shown in FIGS. 32C and 32D.
- the flow control characteristic indicated by the solid line Lm in FIG. 27 is obtained by the two power elements 34 and 35.
- the first expansion portion 482 corresponding to the first power element 34 and the second expansion portion 484 corresponding to the second power element 35 are integrated into one power element 48. 27 can be obtained, and the flow rate control characteristic indicated by the solid line Lm in FIG. 27 can be obtained, so that the number of parts can be reduced and the total length of the expansion valve 12 in the direction of the uniaxial center CL1 can be reduced.
- FIG. 33 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the power element 48 is different from the temperature type expansion valve 12 of the ninth embodiment.
- the power element 48 of the present embodiment is the same in outline as the power element 48 of the ninth embodiment, but the first collar 344 (see FIG. 31) and the second collar in the ninth embodiment. 345 is integrated with the interposed member 481, and is configured by one interposed member 485.
- FIG. 35 is a diagram showing a step that follows the step shown in FIG. 34.
- the manufacturing process sequentially proceeds from the state shown in (a) to the state shown in (i).
- the interposition member 485 includes an interposition portion 485a, a first sandwiching portion 485b extending from the interposition portion 485a, and a second sandwiching portion 485c extending from the interposition portion 485a.
- the first clamping part 485b has a cylindrical shape protruding from the interposition part 485a to one side in the direction of the uniaxial center CL1, and has an inner diameter capable of fitting the first diaphragm 341.
- the second clamping part 485c has a cylindrical shape protruding from the interposition part 485a to the other side in the direction of the uniaxial center CL1, and has an inner diameter into which the second diaphragm 342 can be fitted.
- the first diaphragm 341 is fitted inside the first sandwiching portion 485b until the first diaphragm 341 contacts the interposed portion 485a, and at the same time, the second diaphragm 342 is inserted into the interposed portion 485a. It is inserted inside the second clamping part 485c until it abuts. Thereby, the interposition part 485a is interposed between the first diaphragm 341 and the second diaphragm 342.
- the first clamping portion 485b is bent radially inward.
- the 1st clamping part 485b opposes the interposed part 485a via the 1st diaphragm 341, and clamps the 1st diaphragm 341 with the interposed part 485a.
- the second sandwiching portion 485c is also bent inward in the radial direction.
- the 2nd clamping part 485c opposes the interposed part 485a via the 2nd diaphragm 342, and clamps the 2nd diaphragm 342 with the interposed part 485a.
- the first clamping part 485b corresponds to the first collar 344 of the ninth embodiment
- the second clamping part 485c corresponds to the second collar 345 of the ninth embodiment.
- FIG. 34 (d) to FIG. 35 (i) are sequentially performed.
- the processes shown in FIGS. 34 (d) to 35 (i) are the same as those in FIGS. 32 (b) to 32 (g) of the ninth embodiment.
- FIGS. 36 and 37 show a power element 48 manufactured through the steps shown in FIGS. 34 (a) to 35 (i).
- FIG. 36 is a plan view of the power element 48 of the present embodiment as viewed from the direction of the uniaxial center CL1.
- FIG. 37 is a sectional view taken along the line XXXVII-XXXVII in FIG.
- the power element 48 of the present embodiment is the same as that of the ninth embodiment in terms of the outer shape. And since this embodiment is the same as 9th Embodiment except the power element 48, the effect similar to 9th Embodiment can be acquired.
- the interposition member 485 includes the interposition section 485a, the first sandwiching section 485b, and the second sandwiching section 485c, so that the first collar 344 of the ninth embodiment described above and The second color 345 becomes unnecessary.
- the first diaphragm 341 is fitted inside the first sandwiching portion 485b, so that the first diaphragm 341 and the interposition member 485 are joined.
- the first diaphragm 341 and the interposition member 485 are joined.
- FIG. 38 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment. As shown in FIG. 38, in the temperature type expansion valve 12 of the present embodiment, the power element 48 of the ninth embodiment is replaced with a power element 50. The arrangement of the stopper 322 and the length of the operating rod 323 are also different from those of the ninth embodiment.
- the power element 50 of the present embodiment corresponds to the power element 48 of the ninth embodiment, and is longer in the direction of the uniaxial center CL1 than the power element 48.
- the power element 50 of the present embodiment includes an interposed member 501 instead of the interposed member 481 of the ninth embodiment, and the interposed member 501 is longer than the interposed member 481. Yes.
- the power element 50 of this embodiment is provided with the shape as shown in FIG.39 and FIG.40.
- FIG. 39 is a plan view of the power element 50 of the present embodiment as viewed from the direction of the uniaxial center CL1.
- 40 is a cross-sectional view taken along the line XL-XL in FIG.
- the power element 50 includes the first diaphragm 341, the second diaphragm 342, the first collar 344, and the second collar 345 in addition to the interposed member 501, as in the ninth embodiment. It has.
- the intervention member 501 includes a first joint 501a joined to the first diaphragm 341 by laser welding, a second joint 501b joined to the second diaphragm 342 by laser welding, a first joint 501a, and a second joint 501a. It is comprised from the constricted part 501c which comprised the cylindrical shape interposed between the junction parts 501b.
- the constricted portion 501c is provided with a partition wall 501e that divides the hole 501d in the constricted portion 501c in the direction of the uniaxial center CL1 in the direction of the uniaxial center CL1. That is, the constricted portion 501c includes a first constricted portion 501f disposed on the first diaphragm 341 side with the partition wall 501e as a boundary, and a second constricted portion 501g disposed on the second diaphragm 342 side with the partition wall 501e as a boundary.
- the first constricted portion 501f corresponds to the flow path arranging portion in the present disclosure.
- the power element 50 is formed with a first closed space 50a and a second closed space 50b arranged in the direction of the uniaxial center CL1 via the partition wall 501e. That is, the 1st junction part 501a and the 1st constriction part 501f comprise the 1st space formation part 501h equivalent to the 1st space formation part 481c of a 9th embodiment, and the 2nd junction part 501b and the 2nd The constricted part 501g constitutes a second space forming part 501i corresponding to the second space forming part 481d of the ninth embodiment.
- the first closed space 50a corresponds to the first closed space 48a of the ninth embodiment, is a first enclosed space in which a first fluid is enclosed, and the second closed space 50b is the same as that of the ninth embodiment.
- the second enclosure space corresponds to the second closed space 48b and is filled with a second fluid.
- the power element 50 is functionally similar to the power element 48 of the ninth embodiment. From a functional viewpoint, the power element 50 expands in the direction of the uniaxial center CL1 as the first diaphragm 341 bulges outward,
- the second diaphragm 342 is composed of a second expansion portion 504 that expands in the direction of the uniaxial center CL1 by expanding outward.
- the first expansion portion 502 includes a first diaphragm 341, a first space forming portion 501h, and a first collar 344.
- the second expansion portion 504 includes a second diaphragm 342, a second space forming portion 501 i, and a second collar 345.
- a first fluid introduction path 481e for introducing the first fluid into the first closed space 50a is formed in the first joint portion 501a.
- the first fluid introduction path 481e is closed by a plug 346 after the first fluid is introduced into the first closed space 50a, as in the ninth embodiment.
- a second fluid introduction path 481f for introducing the second fluid into the second closed space 50b is formed in the second joint portion 501a.
- the second fluid introduction path 481f is closed by the plug 346 after the second fluid is introduced into the second closed space 50b, as in the ninth embodiment.
- the power element 50 is disposed so that the constricted portion 501 c of the interposed member 501 is positioned in the second refrigerant passage 38 across the refrigerant flow in the second refrigerant passage 38. . That is, the first constricted part 501f in which a part of the first closed space 50a is formed and the second constricted part 501g in which a part of the second closed space 50b is formed are in the second refrigerant passage 38. Has been placed.
- the refrigerant flowing through the second refrigerant passage 38 flows downstream while being in direct contact with the power element 50, so that the power element 50 operates with higher accuracy than the ninth embodiment according to the refrigerant temperature in the second refrigerant passage 38. It is possible to make it.
- the power element 50 has a symmetrical shape with respect to the virtual plane FCx in the outer shape of the power element 50.
- This symmetrical shape means an approximate symmetrical shape, not a precise one.
- FIG. 41 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the power element 50 is different from the temperature type expansion valve 12 of the eleventh embodiment.
- the plan view of the power element 50 of this embodiment viewed from the direction of the uniaxial center CL1 is the same as FIG. 39 as in the eleventh embodiment.
- the power element 50 of the present embodiment is further compared with the eleventh embodiment in the first adsorbent 506, the second adsorbent 508, and a pair of holding members 510. And.
- 1st adsorbent 506 and 2nd adsorbent 508 adsorb
- the first adsorbent 506 and the second adsorbent 508 are made of, for example, activated carbon or the like having poor thermal conductivity as compared to the interposed member 501.
- the first adsorbent 506 and the second adsorbent 508 differ in the adsorption characteristics that are the relationship between the amount of refrigerant adsorbed and the temperature.
- the first adsorbent 506 is provided in a portion belonging to the first constricted portion 501f in the first closed space 50a of the power element 50. The position of the first adsorbent 506 is held when the first adsorbent 506 is sandwiched between the partition wall 501e and one of the pair of holding members 510 in the direction of the uniaxial center CL1.
- the holding member 510 is a member having air permeability, and is made of, for example, a metal mesh or a filter.
- the second adsorbent 508 is the same as the first adsorbent 506. That is, the second adsorbent 508 is provided in a portion belonging to the second constricted portion 501g in the second closed space 50b. The position of the second adsorbent 508 is held by the second adsorbent 508 being sandwiched in the direction of the uniaxial center CL1 by the partition 501e and the other of the pair of holding members 510.
- the operation responsiveness of the power element 50 to the temperature change of the refrigerant flowing through the second refrigerant passage 38 is improved. It is possible to suppress the sensitive operation of the power element 50 by dulling.
- FIG. 43 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the power element 50 is different from the temperature type expansion valve 12 of the eleventh embodiment.
- the plan view of the power element 50 of this embodiment viewed from the direction of the uniaxial center CL1 is the same as FIG. 39 as in the eleventh embodiment.
- the power element 50 of the present embodiment further includes a first wall member 512 and a second wall member 514, as compared with the eleventh embodiment.
- the first wall member 512 and the second wall member 514 are made of a material having a lower thermal conductivity than that of the interposed member 501 made of metal, for example, resin, and are formed into a bottomed cylindrical shape.
- the first wall member 512 is fitted into the first constricted portion 501f having a bottomed cylindrical shape with the first diaphragm 341 side opened. Therefore, the first inner peripheral surface 501j and the first bottom surface 501k that form the inside of the first constricted portion 501f are covered with the first wall member 512.
- the second wall member 514 is fitted into the bottomed cylindrical second constricted portion 501g with the second diaphragm 342 side opened. Therefore, the second inner peripheral surface 501m and the second bottom surface 501n forming the inside of the second constricted portion 501g are covered with the second wall member 514.
- the inner surface of the first constricted portion 501f is covered with the first wall member 512 having a low thermal conductivity
- the inner surface of the second constricted portion 501g is covered with the second wall member 514 having a low thermal conductivity. Therefore, the sensitive operation of the power element 50 can be suppressed as in the above-described twelfth embodiment.
- FIG. 45 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the temperature type expansion valve 12 of the present embodiment differs from the temperature type expansion valve 12 of the eighth embodiment in a first power element 54 and a second power element 56. Therefore, the points that the first power element 54 is different from the first power element 34 of the eighth embodiment and the points that the second power element 56 is different from the second power element 35 of the eighth embodiment will be mainly described.
- FIG. 46 is a plan view of the first power element 54 shown in FIG. 45 viewed from the direction of the uniaxial center CL1.
- 47 is a sectional view taken along XLVII-XLVII in FIG.
- the first power element 54 includes a cover member 541 instead of the interposed member 343 of the eighth embodiment.
- the first power element 54 does not include the first collar 344 and the first diaphragm 341 according to the eighth embodiment, and includes only the second diaphragm 342 as the diaphragm.
- the cover member 541 is formed so that the second diaphragm 342 side in the direction of the uniaxial center CL1 is recessed.
- the cover member 541 is welded over the entire circumference around the uniaxial center CL1 with the peripheral portion 342a of the second diaphragm 342 sandwiched between the cover member 541 and joined to the second diaphragm 342 and the second collar 345.
- a two-dot chain line in FIG. 47 represents a welding site.
- a fluid introduction path 541a for introducing the first fluid into the first closed space 34a is formed at the top of the cover member 541.
- the fluid introduction path 541a is closed by a plug 542 after the first fluid is introduced into the first closed space 34a.
- the second power element 56 is the same as the first power element 54 described above, except for the sealed fluid. That is, the second power element 56 includes only the fourth diaphragm 352 as a diaphragm, and the second power element 56 has a second closed space 35a in which a second fluid is sealed. In FIG. 47, those symbols 56, 352, and 35a are displayed in parentheses.
- the plug 542 fixed to the cover member 541 of the first power element 54 is pressed against the contact surface 46a of the lid member 46 in the direction of the uniaxial center CL1.
- the plug 542 fixed to the cover member 541 of the second power element 56 is pressed against the second diaphragm 342 of the first power element 54.
- the temperature type expansion valve 12 includes the first power element 54 enclosing the first fluid and the second power element 56 enclosing the second fluid, similar to the eighth embodiment described above. Therefore, as with the eighth embodiment, it is easy to arbitrarily obtain the flow rate control characteristics of the valve mechanism portion 32.
- the plug 542 is attached to the cover member 541 from the direction of the uniaxial center CL1, and therefore, when the plug 542 is welded to the cover member 541 as compared with the above-described eighth embodiment.
- the first power element 54 and the second power element 56 can be easily manufactured.
- FIG. 48 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the power element 48 is different from the temperature type expansion valve 12 of the ninth embodiment.
- the first collar 344 and the second collar 345 are different from the ninth embodiment.
- FIGS. 49 and 50 Detailed views of the power element 48 shown in FIG. 48 are shown in FIGS. 49 and 50.
- 49 is a plan view of the power element 48 of the present embodiment as viewed from the direction of the uniaxial center CL1
- FIG. 50 is a cross-sectional view taken on line LL of FIG.
- the first collar 344 includes a diaphragm pressing portion 344c that is fixed by sandwiching the peripheral portion 341a of the first diaphragm 341 with the interposition member 481, and the diaphragm pressing portion 344c. And an extended portion 344d extending radially inward. This extending portion 344d corresponds to the limiting portion of the present disclosure.
- the diaphragm pressing portion 344c corresponds to the entire first collar 344 of the eighth embodiment, and therefore the first collar 344 of the present embodiment extends to the first collar 344 of the eighth embodiment. A portion 344d is added.
- a through-hole 344e formed so as not to prevent the first diaphragm 341 from contacting the contact surface 46a of the lid member 46 is formed in the central portion of the extending portion 344d. ing.
- the extended portion 344d is disposed so as to come into contact with the first diaphragm 341 when the first diaphragm 341 expands to some extent. And if the 1st diaphragm 341 expands until it contacts the extension part 344d, it will be restrict
- the extending portion 344d has a function of restricting deformation of the first diaphragm 341 so as to swell. Therefore, the deformation of the first diaphragm 341 can be suppressed so that the durability is not impaired.
- the deformation of the first diaphragm 341 is not suppressed by the lid member 46 and the stopper 322, so the extending portion 344 d This is particularly effective in such cases.
- the second collar 345 is the same as the first collar 344 described above. That is, the second collar 345 includes a diaphragm pressing portion 345c corresponding to the diaphragm pressing portion 344c of the first collar 344 and an extending portion 345d corresponding to the extending portion 344d of the first collar 344. A through hole 345e corresponding to the through hole 344e of the first collar 344 is formed in the extending portion 345d of the second collar 345.
- FIG. 51 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment.
- the first power element 34 of the eighth embodiment is replaced with the first power element 60 with respect to the eighth embodiment.
- the second power element 35 of the embodiment is replaced with a second power element 62. Therefore, the points that the first power element 60 is different from the first power element 34 of the eighth embodiment and the points that the second power element 62 is different from the second power element 35 of the eighth embodiment will be mainly described.
- FIG. 52 shows a detailed view of the first power element 60 shown in FIG.
- FIG. 52 is a cross-sectional view of the first power element 60 taken along a cross section including the uniaxial center CL1.
- the first power element 60 includes a first diaphragm 601 in place of the first diaphragm 341 in the eighth embodiment, and a second diaphragm 342 in place of the second diaphragm 342 in the eighth embodiment.
- a diaphragm 602 is provided.
- the first power element 60 does not include the interposed member 343, the first collar 344, and the second collar 345 included in the first power element 34 of the eighth embodiment.
- the first diaphragm 601 is composed of a thin spring member, similar to the first diaphragm 341 of the eighth embodiment.
- the 1st diaphragm 601 is shape
- the first pressure-sensitive deformation portion 601a has a disk shape orthogonal to the direction of the uniaxial center CL1, and deforms so as to swell in the direction of the uniaxial center CL1 according to the internal pressure of the first closed space 34a. That is, the first pressure-sensitive deformation portion 601a functions in the same manner as the first diaphragm 341 of the first embodiment.
- the first peripheral edge 601b has a cylindrical shape centered on the uniaxial center CL1.
- the base end 601c of the first peripheral portion 601b is connected to the peripheral edge of the first pressure-sensitive deformable portion 601a.
- the base end 601c of the first peripheral edge portion 601b that is, the peripheral edge of the first pressure-sensitive deformable portion 601a is a fulcrum when the first pressure-sensitive deformable portion 601a expands due to the internal pressure of the first closed space 34a.
- the first pressure-sensitive deformation portion 601a is deformed so as to swell with the base end 601c of the first peripheral edge portion 601b as a fulcrum.
- the second diaphragm 602 has the same configuration as the first diaphragm 601. That is, the second diaphragm 602 includes a second pressure-sensitive deformable portion 602a corresponding to the first pressure-sensitive deformable portion 601a and a second peripheral edge portion 602b corresponding to the first peripheral edge portion 601b.
- the second pressure-sensitive deformation portion 602a functions in the same manner as the second diaphragm 342 of the eighth embodiment.
- the base end 602c of the second peripheral edge portion 602b that is, the peripheral edge of the second pressure-sensitive deformable portion 602a is a fulcrum when the second pressure-sensitive deformable portion 602a expands due to the internal pressure of the first closed space 34a.
- the tip 601d of the first peripheral edge 601b is joined to the tip 602d of the second peripheral edge 602b.
- the joint portion is welded, for example, over the entire circumference around the uniaxial center CL1 so as to have airtightness.
- the 1st closed space 34a is formed by joining the 1st peripheral part 601b and the 2nd peripheral part 602b mutually in this way.
- the first diaphragm 601 has the first diaphragm 601 and the second diaphragm 601 relative to the base end 601c of the first peripheral edge 601b, which is a fulcrum when the first pressure-sensitive deformable portion 601a swells.
- the tip 601d of the first peripheral edge 601b, which is the joint location with 602, is formed so as to be separated.
- the second diaphragm 602 is a joint between the first diaphragm 601 and the second diaphragm 602 with respect to the base end 602c of the second peripheral edge 602b, which is a fulcrum when the second pressure-sensitive deformable portion 602a swells. It forms so that the front-end
- a fluid introduction path 601e for introducing the first fluid into the first closed space 34a is formed in the first peripheral edge 601b.
- the fluid introduction path 601e is closed by a plug 603 after the first fluid is introduced into the first closed space 34a.
- the second power element 62 is the same as the first power element 60 described above except for the sealed fluid.
- the second power element 62 has a second closed space 35a in which a second fluid is enclosed, and the second closed space 35a has the same shape as the first closed space 34a.
- the symbols 35a and 62 are shown in parentheses.
- the temperature type expansion valve 12 includes the first power element 60 enclosing the first fluid and the second power element 62 enclosing the second fluid, similar to the eighth embodiment described above. Therefore, as with the eighth embodiment, it is easy to arbitrarily obtain the flow rate control characteristics of the valve mechanism portion 32.
- the bending is performed with the position shifted from the joining position between the first diaphragm 601 and the second diaphragm 602 by welding.
- the stress concentration portions at the time of deformation of the first diaphragm 601 and the second diaphragm 602 are separated from the joint portions, and the durability of the first diaphragm 601 and the second diaphragm 602 can be improved.
- FIG. 53 is a cross-sectional view of the temperature type expansion valve 12 of the present embodiment. As shown in FIG. 53, in the temperature type expansion valve 12 of this embodiment, the 2nd power element 35 differs with respect to 8th Embodiment. On the other hand, the first power element 34 is the same as in the eighth embodiment.
- the diameter of the second power element 35 of the present embodiment is smaller than that of the eighth embodiment. Therefore, as shown in FIG. 53, the diameter of the second power element 35 is smaller than that of the first power element 34. That is, the diameters of the third diaphragm 351 and the fourth diaphragm 352 constituting the second power element 35 are smaller than the diameters of the first diaphragm 341 and the second diaphragm 342 constituting the first power element 34.
- the diaphragms 341, 342, 351, and 352 have the same plate thickness, but the third diaphragm 351 and the fourth diaphragm when the second power element 35 expands in the direction of the uniaxial center CL1.
- the spring constant k2 of 352 is larger than the spring constant k1 of the first diaphragm 341 and the second diaphragm 342 of the first power element 34.
- the shapes, for example, the diameters of the first diaphragm 341 and the second diaphragm 342 are different from those of the third diaphragm 351 and the fourth diaphragm 352.
- the 1st expansion characteristic which is the relation between the pressure of the 1st fluid enclosed with the 1st closed space 34a, and the amount of expansion of the 1st power element 34, and the 2nd enclosed with the 2nd closed space 35a.
- the second expansion characteristic which is the relationship between the fluid pressure and the expansion amount of the second power element 35, is different from each other.
- the flow rate control characteristic of the valve mechanism portion 32 as a whole is the first flow rate control characteristic by only the first power element 34 enclosing the first fluid, and the second flow control characteristic. It becomes an intermediate thing with the 2nd flow control characteristic by only the 2nd power element 35 with which the fluid was enclosed, and it is easy to obtain the flow control characteristic of valve mechanism part 32 arbitrarily.
- the spring constant k1 of the first power element 34 is smaller than the spring constant k2 of the second power element 35, the change in the internal pressure of the first closed space 34a is greater than the change in the internal pressure of the second closed space 35a. This is easily reflected in the operation of the spherical valve 321 of the mechanism unit 32. Therefore, the flow rate control characteristic of the valve mechanism 32 can be made closer to the first flow rate control characteristic than the above-described second flow rate control characteristic. This will be described in detail with reference to FIG.
- FIG. 54 is a diagram corresponding to FIG. 27 described above, and is a diagram illustrating flow rate control characteristics in the present embodiment.
- a two-dot chain line Ls in FIG. 54 represents the saturation temperature characteristic of the refrigerant in the second refrigerant passage 38
- a broken line LA represents the first flow rate control characteristic
- a one-dot chain line LB represents the second flow rate.
- the control characteristic is represented, and the solid line Lm represents the flow rate control characteristic of the valve mechanism 32.
- this solid line Lm is a different curve from FIG. Specifically, as described above, the change in the internal pressure of the first closed space 34a is more easily reflected in the operation of the spherical valve 321 of the valve mechanism 32 than the change in the internal pressure of the second closed space 35a.
- the flow rate control characteristic of the valve mechanism 32 shown is closer to the first flow rate control characteristic indicated by the broken line LA than the second flow rate control characteristic indicated by the alternate long and short dash line LB.
- the flow rate control characteristic of the valve mechanism 32 can be determined according to the first fluid and the second fluid.
- the first expansion characteristic of the first power element 34 and the second power element 35 The flow rate control characteristic of the valve mechanism portion 32 can also be determined according to the second expansion characteristic.
- the first fluid contains the same kind of refrigerant as the refrigerant flowing in the second refrigerant passage 38, but contains a different kind of refrigerant instead of the same kind of refrigerant. It doesn't matter if it goes out.
- the power element 50 includes the first adsorbent 506 and the second adsorbent 508, but only one of the first adsorbent 506 and the second adsorbent 508 is used. It does not matter if the other is not provided.
- the first wall member 512 covers the first inner peripheral surface 501j and the first bottom surface 501k of the first constricted portion 501f, but in addition to or instead of it.
- the first outer peripheral surface 501p that forms the outer periphery of the first constricted portion 501f may be covered.
- the second wall member 514 may cover the second outer peripheral surface 501q that forms the outer periphery of the second constricted portion 501g.
- the first power element 34 is interposed between the contact surface 46a of the lid member 46 and the second power element 35 in the direction of the uniaxial center CL1.
- the second power element 35 may be interposed between the contact surface 46a of the lid member 46 and the first power element 34.
- the diameter of the second power element 35 is smaller than that of the first power element 34. Conversely, the diameter of the second power element 35 is equal to the first power element 34. It can be larger. If doing so, contrary to the seventeenth embodiment, the change in the internal pressure of the second closed space 35a is reflected in the operation of the spherical valve 321 of the valve mechanism 32 rather than the change in the internal pressure of the first closed space 34a. It becomes easy to be done. Therefore, the flow rate control characteristic of the valve mechanism 32 indicated by the solid line Lm in FIG. 54 is closer to the second flow rate control characteristic indicated by the one-dot chain line LB than the first flow rate control characteristic indicated by the broken line LA.
- the diameters of both the first diaphragm 341 and the second diaphragm 342 are larger than those of the third diaphragm 351 and the fourth diaphragm 352.
- the diameters of the first diaphragm 341 and the second diaphragm 342 are different, and only one of the diameters may be larger than one or both of the third diaphragm 351 and the fourth diaphragm 352.
- the diameters of both the first diaphragm 341 and the second diaphragm 342 are different from both the third diaphragm 351 and the fourth diaphragm 352.
- the plate thickness of one or both of the first diaphragm 341 and the second diaphragm 342 is different from one or both of the third diaphragm 351 and the fourth diaphragm 352, whereby the first power
- the first expansion characteristic of the element 34 and the second expansion characteristic of the second power element 35 may be different from each other.
- the first fluid introduction path 481e and the second fluid introduction path 481f are formed in the interposed member 481, but they may be formed in other members.
- the first diaphragm 341 and the second diaphragm 342 are respectively welded to the interposition members 343, 481, 485, 501 so that the power elements 34, 35, 48, 50 airtightness is ensured.
- the first diaphragm 341 and the second diaphragm 342 are respectively interposed by means other than welding by means of interposing members 343, 481, 485, 501. Even if it is joined to the.
- the power elements 34, 35, 48, and 50 have a symmetrical outer shape with respect to the virtual plane FCx, but they may not have a symmetrical outer shape. Absent.
- the expansion valve 12 constitutes a part of the vapor compression refrigeration cycle 10, but it may be used for other purposes.
- the expansion valve 12 is configured such that the first power element 34 and the second power element 35 expand according to the refrigerant temperature in the second refrigerant passage 38.
- the first power element 34 and the second power element 35 may be configured to expand by a temperature other than the refrigerant temperature in the second refrigerant passage 38.
- the refrigerant that is the same fluid as the first refrigerant passage 36 flows through the second refrigerant passage 38, but the fluid that flows through the first refrigerant passage 36 passes through the second refrigerant passage 38. May be different fluids.
- the first fluid sealed in the first power element 34 and the second fluid sealed in the second power element 35 are both composed of a refrigerant and an inert gas. Although it is a mixed fluid, it may be a refrigerant alone. Furthermore, the first fluid and the second fluid are not particularly limited as long as the fluid expands in volume as the temperature rises. The same applies to the ninth to seventeenth embodiments.
- the lid member 46 side is called the first diaphragm 341 and the stopper 322 side is called the second diaphragm 342.
- the lid member 46 side may be called the second diaphragm 342 and the stopper 322 side may be called the first diaphragm 341.
- the thermal expansion valve 12 includes one power element 48, 50.
- the elements 48 and 50 may be provided so as to be stacked in the direction of the uniaxial center CL1.
- the temperature type expansion valve 12 includes the first power element 34 and the second power element 35 stacked one by one in the direction of the uniaxial center CL1, but FIG. As shown in FIG. 3, it is possible to provide another first power element 34. That is, the temperature type expansion valve 12 may include two first power elements 34 and one second power element 35 stacked in the direction of the uniaxial center CL1. 56, the volume change of the first fluid with respect to the temperature change is more easily reflected in the operation of the spherical valve 321 of the valve mechanism 32 than the volume change of the second fluid. Therefore, similarly to the above-described seventeenth embodiment, the flow rate control characteristic of the valve mechanism portion 32 can be closer to the first flow rate control characteristic than the second flow rate control characteristic.
- the first power element 54 does not include the first diaphragm 341 but includes the second diaphragm 342. Conversely, the first power element 54 does not include the second diaphragm 342 and does not include the first diaphragm 341. It can be provided. In that case, the cover member 541 is joined to the first diaphragm 341 to form the first enclosed space 34a.
- the adsorption characteristics of the first adsorbent 506 are different from those of the second adsorbent 508, but may be the same as those of the second adsorbent 508.
- the first power elements 34, 54, and 60 and the second power elements 35, 56, and 62 have the same shape, but the shapes are different from each other. It does not matter.
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Abstract
Description
流通流体を減圧させる減圧流路を有し流通流体が流れる第1の流路と、
一軸心の軸方向における第1ダイヤフラムおよび第2ダイヤフラムの変形に応じて第1の流路における流通流体の流量を調節する流量調節部とを備え、
膨張部は、第1ダイヤフラムと第2ダイヤフラムとの間に介装された介装部材を有し、
介装部材が第1ダイヤフラムと第2ダイヤフラムとの間に介装されることにより流体封入空間が形成されている。
第1流体が封入されその第1流体の温度が上昇するほど一軸心の軸方向に膨張する第1膨張部と、
その第1膨張部に対し一軸心の軸方向に積層され、第1流体とは異なる第2流体が封入されその第2流体の温度が上昇するほど一軸心の軸方向に膨張する第2膨張部と、
一軸心の軸方向における第1膨張部と第2膨張部との両方の膨張に応じて第1の流路における流通流体の流量を調節する流量調節部とを備えている。
図1は、本開示における膨張弁である温度式膨張弁12の断面図である。この温度式膨張弁12は、車両用の蒸気圧縮式冷凍サイクル10の一部を構成しており、図1は、温度式膨張弁12と蒸気圧縮式冷凍サイクル10の各構成機器との接続関係についても模式的に図示している。
また、作動棒323が挿入されたOリング326が、止め輪327によりボデー部30に対して保持されている。そのOリング326は、第1冷媒通路36と第2冷媒通路38との間で冷媒が作動棒323とボデー部30との間の隙間を伝わって流通することを防止している。
次に、本開示の第2実施形態について説明する。本実施形態では、前述の第1実施形態と異なる点を主として説明する。また、前述の実施形態と同一または均等な部分については省略または簡略化して説明する。後述の第3実施形態以降でも同様である。
次に、本開示の第3実施形態について説明する。本実施形態では、前述の第1実施形態と異なる点を主として説明する。
次に、本開示の第4実施形態について説明する。本実施形態では、前述の第3実施形態と異なる点を主として説明する。
次に、本開示の第5実施形態について説明する。本実施形態では、前述の第3実施形態と異なる点を主として説明する。
次に、本開示の第6実施形態について説明する。本実施形態では、前述の第1実施形態と異なる点を主として説明する。
次に、本開示の第7実施形態について説明する。本実施形態では、前述の第1実施形態と異なる点を主として説明する。
(1)上述の第4実施形態の図17において、壁部材504は、括れ部501cの内周面501dを覆っているが、その内周面501dに加えて或いは内周面501dに替えて、括れ部501cの外周面501eを覆っていても差し支えない。
図22は、本開示における膨張弁である温度式膨張弁12の断面図である。この温度式膨張弁12は、車両用の蒸気圧縮式冷凍サイクル10の一部を構成しており、図22は、温度式膨張弁12と蒸気圧縮式冷凍サイクル10の各構成機器との接続関係についても模式的に図示している。
また、作動棒323が挿入されたOリング326が、止め輪327によりボデー部30に対して保持されている。そのOリング326は、第1冷媒通路36と第2冷媒通路38との間で冷媒が作動棒323とボデー部30との間の隙間を伝わって流通することを防止している。
次に、本開示の第9実施形態について説明する。本実施形態では、前述の第8実施形態と異なる点を主として説明する。また、前述の実施形態と同一または均等な部分については省略または簡略化して説明する。後述の第10実施形態以降でも同様である。
次に、本開示の第10実施形態について説明する。本実施形態では、前述の第9実施形態と異なる点を主として説明する。
次に、本開示の第11実施形態について説明する。本実施形態では、前述の第9実施形態と異なる点を主として説明する。
次に、本開示の第12実施形態について説明する。本実施形態では、前述の第11実施形態と異なる点を主として説明する。
次に、本開示の第13実施形態について説明する。本実施形態では、前述の第11実施形態と異なる点を主として説明する。
次に、本開示の第14実施形態について説明する。本実施形態では、前述の第8実施形態と異なる点を主として説明する。
次に、本開示の第15実施形態について説明する。本実施形態では、前述の第9実施形態と異なる点を主として説明する。
次に、本開示の第16実施形態について説明する。本実施形態では、前述の第8実施形態と異なる点を主として説明する。
次に、本開示の第17実施形態について説明する。本実施形態では、前述の第8実施形態と異なる点を主として説明する。
(1)上述の第8~第17実施形態において、第1流体は、第2冷媒通路38を流れる冷媒と同種の冷媒を含んでいるが、その同種の冷媒に替えて異なる種類の冷媒を含んでいても差し支えない。
Claims (36)
- 第1ダイヤフラム(341)と、該第1ダイヤフラムに対し一軸心(CL1)の軸方向に積層された第2ダイヤフラム(342)とを有し、前記第1ダイヤフラムおよび前記第2ダイヤフラムの間に封入流体が封入された流体封入空間(34a、50a)が形成されており、該流体封入空間内の圧力が高まるほど前記一軸心の軸方向において前記第1ダイヤフラムおよび前記第2ダイヤフラムが外側にそれぞれ膨らむ膨張部(34、50)と、
流通流体を減圧させる減圧流路(363)を有し、前記流通流体が流れる第1の流路(36)と、
前記一軸心の軸方向における前記第1ダイヤフラムおよび前記第2ダイヤフラムの変形に応じて前記第1の流路における前記流通流体の流量を調節する流量調節部(32)とを備え、
前記膨張部は、前記第1ダイヤフラムと前記第2ダイヤフラムとの間に介装された介装部材(343、348、501)を有し、
前記介装部材が前記第1ダイヤフラムと前記第2ダイヤフラムとの間に介装されることにより前記流体封入空間が形成されている膨張弁。 - 前記介装部材は、前記第1ダイヤフラムが有する周縁部分(341a)に接する環状の接触面(343a)を有し、
前記介装部材は、前記接触面の内周端(343d)よりも前記一軸心の径方向外側で前記第1ダイヤフラムに接合されている請求項1に記載の膨張弁。 - 前記膨張部は、前記第1ダイヤフラムに対し前記一軸心の軸方向において前記介装部材(343、501)の接触面とは反対側に設けられた環状のカラー(344)を有し、
前記カラーは、前記第1ダイヤフラムに接するカラー接触面(344a)を有し、該カラー接触面の内周端(344b)よりも前記一軸心の径方向外側で前記第1ダイヤフラムに接合されている請求項2に記載の膨張弁。 - 前記カラーは、前記第1ダイヤフラムが膨らむように変形することを制限する制限部(344d)を備えている請求項3に記載の膨張弁。
- 前記制限部は、前記カラ―から径方向内側へ延出し、前記第1ダイヤフラムが膨らむように変形した際に接触することで当該第1ダイヤフラムの変形を制限する請求項4記載の膨張弁。
- 前記介装部材には、前記流体封入空間内へ前記封入流体を導入するための流体導入路(343c)が形成されている請求項1ないし5のいずれか1つに記載の膨張弁。
- 前記膨張部は、該膨張部の中心を通り前記一軸心に直交する仮想面(FCx)に対して対称的な外形形状を成している請求項1ないし6のいずれか1つに記載の膨張弁。
- 前記流通流体が流れる第2の流路(38)を前記第1の流路とは別個に備え、
前記介装部材(501)は、前記第2の流路内に配置され前記流体封入空間の少なくとも一部が形成されている流路配置部(501c)を有している請求項1ないし7のいずれか1つに記載の膨張弁。 - 前記膨張部(50)は、前記封入流体を吸着する吸着材(502)を前記流体封入空間内で前記流路配置部に属する部位に有している請求項8に記載の膨張弁。
- 前記流路配置部の内周面(501d)と外周面(501e)との一方または両方は、前記介装部材よりも熱伝導率の低い部材(504)で覆われている請求項8に記載の膨張弁。
- 前記第1の流路が形成され前記流量調節部を収容しているボデー部(30)を備え、
前記膨張部は、前記ボデー部内に収容されている請求項1ないし10のいずれか1つに記載の膨張弁。 - 前記膨張部を外部の空間と隔てている樹脂製の蓋部材(46)を備え、
該蓋部材は、前記膨張部に接している請求項11に記載の膨張弁。 - 前記一軸心の軸方向に移動不能な固定面(46a)を備え、
前記流量調節部は、前記一軸心の軸方向に変位することにより前記第1の流路における前記流通流体の流量を増減する作動部材(321、322、323)を備え、
前記一軸心の軸方向において、前記第1ダイヤフラムおよび前記第2ダイヤフラムの一方は前記固定面に押し当てられ、他方は前記作動部材を変位させる請求項12に記載の膨張弁。 - 前記蓋部材は、前記膨張部の作動時に前記一軸心の軸方向に移動不能な固定面(46a)を備え、
前記流量調節部は、前記一軸心の軸方向に変位することにより前記第1の流路における前記流通流体の流量を増減する作動部材(321、322、323)を備え、
前記一軸心の軸方向において、前記第1ダイヤフラムおよび前記第2ダイヤフラムの一方は前記固定面に押し当てられ、他方は前記作動部材を変位させる請求項12に記載の膨張弁。 - 前記介装部材(348)は、前記一軸心の軸方向において前記第1ダイヤフラムと前記第2ダイヤフラムとの間に介装されている介装部(348a)と、該介装部から延設され該介装部との間で前記第1ダイヤフラムを挟持する第1挟持部(348b)と、前記介装部から延設され、該介装部との間で前記第2ダイヤフラムを挟持する第2挟持部(348c)とを備えている請求項1または2に記載の膨張弁。
- 前記膨張部は、前記一軸心の軸方向に積層されて複数設けられている請求項1ないし15のいずれか1つに記載の膨張弁。
- 流通流体を減圧させる減圧流路(363)を有し前記流通流体が流れる第1の流路(36)と、
第1流体が封入され該第1流体の温度が上昇するほど一軸心(CL1)の軸方向に膨張する第1膨張部(34、482、502、54、60)と、
該第1膨張部に対し前記一軸心の軸方向に積層され、前記第1流体とは異なる第2流体が封入され該第2流体の温度が上昇するほど前記一軸心の軸方向に膨張する第2膨張部(35、484、504、56、62)と、
前記一軸心の軸方向における前記第1膨張部と前記第2膨張部との両方の膨張に応じて前記第1の流路における前記流通流体の流量を調節する流量調節部(32)とを備えている膨張弁。 - 前記第1膨張部(34、60)には、前記第1流体が封入された封入空間(34a)が形成されており、
前記第1膨張部は、前記一軸心の軸方向において前記封入空間の一方側を構成する第1ダイヤフラム(341、601)と、前記封入空間の他方側を構成する第2ダイヤフラム(342、602)とを有し、
前記第1膨張部は、前記第1ダイヤフラムおよび前記第2ダイヤフラムが外側にそれぞれ膨らむことで前記一軸心の軸方向に膨張する請求項17に記載の膨張弁。 - 前記第1膨張部(34)は、前記第1ダイヤフラムと前記第2ダイヤフラムとの間に介装された介装部材(343)を有し、
該介装部材は、前記第1ダイヤフラムと前記第2ダイヤフラムとにそれぞれ接合されることによって前記封入空間を形成している請求項18に記載の膨張弁。 - 前記介装部材には、前記封入空間内へ前記第1流体を導入するための流体導入路(343c)が形成されている請求項19に記載の膨張弁。
- 前記第1膨張部および前記第2膨張部は、前記第1流体の圧力と前記第1膨張部の膨張量との関係である第1膨張特性と、前記第2流体の圧力と前記第2膨張部の膨張量との関係である第2膨張特性とが互いに異なるように構成されている請求項18ないし20のいずれか1つに記載の膨張弁。
- 前記第2膨張部(35)には、前記第2流体が封入された第2の封入空間(35a)が形成されており、
前記第2膨張部は、前記一軸心の軸方向において前記第2の封入空間の一方側を構成する第3ダイヤフラム(351)と、前記第2の封入空間の他方側を構成する第4ダイヤフラム(352)とを有し、
前記第2膨張部は、前記第3ダイヤフラムおよび前記第4ダイヤフラムが外側にそれぞれ膨らむことで前記一軸心の軸方向に膨張し、
前記第1膨張部および前記第2膨張部は、前記第1ダイヤフラムおよび前記第2ダイヤフラムの一方または両方の形状が前記第3ダイヤフラムおよび前記第4ダイヤフラムの一方または両方と異なることによって前記第1膨張特性と前記第2膨張特性とが互いに異なるように構成されている請求項21に記載の膨張弁。 - 前記第2膨張部(35)には、前記第2流体が封入された第2の封入空間(35a)が形成されており、
前記第2膨張部は、前記一軸心の軸方向において前記第2の封入空間の一方側を構成する第3ダイヤフラム(351)と、前記第2の封入空間の他方側を構成する第4ダイヤフラム(352)とを有し、
前記第2膨張部は、前記第3ダイヤフラムおよび前記第4ダイヤフラムが外側にそれぞれ膨らむことで前記一軸心の軸方向に膨張し、
前記第1膨張部および前記第2膨張部は、前記第1ダイヤフラムおよび前記第2ダイヤフラムの一方または両方の直径が前記第3ダイヤフラムおよび前記第4ダイヤフラムの一方または両方と異なることによって前記第1膨張特性と前記第2膨張特性とが互いに異なるように構成されている請求項21に記載の膨張弁。 - 前記第2膨張部(35)には、前記第2流体が封入された第2の封入空間(35a)が形成されており、
前記第2膨張部は、前記一軸心の軸方向において前記第2の封入空間の一方側を構成する第3ダイヤフラム(351)と、前記第2の封入空間の他方側を構成する第4ダイヤフラム(352)とを有し、
前記第2膨張部は、前記第3ダイヤフラムおよび前記第4ダイヤフラムが外側にそれぞれ膨らむことで前記一軸心の軸方向に膨張し、
前記第1膨張部および前記第2膨張部は、前記第1ダイヤフラムおよび前記第2ダイヤフラムの一方または両方の板厚が前記第3ダイヤフラムおよび前記第4ダイヤフラムの一方または両方と異なることによって前記第1膨張特性と前記第2膨張特性とが互いに異なるように構成されている請求項21に記載の膨張弁。 - 前記封入空間(34a)は、前記第1ダイヤフラム(601)が有する前記一軸心まわりの周縁部(601b)と前記第2ダイヤフラム(602)が有する前記一軸心まわりの周縁部(602b)とが互いに接合されることにより形成され、
前記第1ダイヤフラムと前記第2ダイヤフラムとはそれぞれ、前記第1ダイヤフラムと前記第2ダイヤフラムとが膨らむときのそれぞれの支点(601c、602c)に対して前記第1ダイヤフラムと前記第2ダイヤフラムとの接合箇所が離れるように形成されている請求項18に記載の膨張弁。 - 前記第1膨張部(482、502、54)は、
第1ダイヤフラム(341)と、
該第1ダイヤフラムと接合されることによって、該第1ダイヤフラムに対し前記一軸心の軸方向における一方に、前記第1流体が封入された第1封入空間(34a、48a、50a)を形成している第1空間形成部(481c、501h、541)とを有し、
前記第1膨張部は前記第1ダイヤフラムが外側に膨らむことで前記一軸心の軸方向に膨張する請求項17に記載の膨張弁。 - 前記第2膨張部(484、504)は、
前記第1ダイヤフラムに対し前記一軸心の軸方向に積層された第2ダイヤフラム(342)と、
前記第1空間形成部と一体に構成されると共に該第1空間形成部と前記第2ダイヤフラムとの間に配設され、前記第2ダイヤフラムと接合されることによって、前記一軸心の軸方向において前記第2ダイヤフラムの前記第1ダイヤフラム側に、前記第2流体が封入された第2封入空間(48b、50b)を形成している第2空間形成部(481d、501i)とを有し、
前記第2膨張部は前記第2ダイヤフラムが外側に膨らむことで前記一軸心の軸方向に膨張する請求項26に記載の膨張弁。 - 前記第1空間形成部(481c、501h)には、前記第1封入空間(48a、50a)内へ前記第1流体を導入するための流体導入路(481e)が形成されている請求項27に記載の膨張弁。
- 前記流通流体が流れる第2の流路(38)を前記第1の流路とは別個に備え、
前記第1空間形成部(501h)は、前記第2の流路内に配置され前記第1封入空間の少なくとも一部が形成されている流路配置部(501f)を有している請求項27または28に記載の膨張弁。 - 前記第1膨張部は、前記第1流体を吸着する第1吸着材(506)を前記第1封入空間内に有し、
前記第2膨張部は、前記第2流体を吸着し前記第1吸着材とは異なる第2吸着材(508)を前記第2封入空間内に有している請求項29に記載の膨張弁。 - 前記流路配置部の内周面(501j)と外周面(501p)との一方または両方は、該流路配置部よりも熱伝導率の低い部材(512)で覆われている請求項29に記載の膨張弁。
- 前記第1膨張部と前記第2膨張部とから成る部材(48、50)が前記一軸心の軸方向に複数積層するように設けられている請求項27ないし31のいずれか1つに記載の膨張弁。
- 前記第1膨張部は、前記第1ダイヤフラムに対し前記一軸心の軸方向において前記第2ダイヤフラム側とは反対側に設けられた環状のカラー(344)を有し、
前記カラーは、前記第1ダイヤフラムに接するカラー接触面(344a)を有し、該カラー接触面の内周端(344b)よりも前記一軸心の径方向外側で前記第1ダイヤフラムに接合されている請求項18ないし24、26ないし32のいずれか1つに記載の膨張弁。 - 前記カラーは、前記第1ダイヤフラムが膨らむように変形することを制限する制限部(344d)を備えている請求項33に記載の膨張弁。
- 前記制限部は、前記カラ―から径方向内側へ延出し、前記第1ダイヤフラムが膨らむように変形した際に接触することで当該第1ダイヤフラムの変形を制限する請求項34記載の膨張弁。
- 前記第1膨張部には、冷媒と不活性ガスとを混合した流体が前記第1流体として封入されている請求項17ないし35のいずれか1つに記載の膨張弁。
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US10436349B2 (en) * | 2015-06-09 | 2019-10-08 | Denso Corporation | Pressure reduction valve |
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DE102019123902A1 (de) * | 2019-09-05 | 2021-03-11 | Hanon Systems | Vorrichtung zum Dämpfen von Druckpulsationen für einen Verdichter eines gasförmigen Fluids |
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