CN114233878B - Electric valve and refrigeration cycle system - Google Patents
Electric valve and refrigeration cycle system Download PDFInfo
- Publication number
- CN114233878B CN114233878B CN202111564601.1A CN202111564601A CN114233878B CN 114233878 B CN114233878 B CN 114233878B CN 202111564601 A CN202111564601 A CN 202111564601A CN 114233878 B CN114233878 B CN 114233878B
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- Prior art keywords
- valve
- chamber
- electric
- back pressure
- guide
- Prior art date
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 description 9
- 239000003507 refrigerant Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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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
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/046—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor
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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
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
- F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention provides an electric valve and a refrigeration cycle system. The electric valve (100) holds the valve member (2) via a bearing (31) and prevents foreign matter and the like in the fluid from entering the rotary bearing. In the electric valve (100), a sealing part (73) is arranged between the valve guide part (7) and the valve component (2) for sealing the valve chamber (1A) and the back pressure chamber (7A). A valve frame part (3) having a bearing (31) connected to a rotor shaft (51) is provided. And holds the valve member (2) in the valve frame (3). A support member (4) is provided for guiding the valve frame (3) in the direction of the axis X. The bearing (31) is surrounded by a cylindrical housing (32) (cover member) of the valve frame (2).
Description
The present application is a divisional application with application number 201910476516.6, the application date is 2019, 6, 3.
Technical Field
The present invention relates to an electrically operated valve and a refrigeration cycle system.
Background
The design concept of an electric valve, particularly a pressure-balanced electric valve, used in a refrigeration cycle system and the like is as follows: in order to eliminate the differential pressure applied to the valve member, the back pressure chamber provided in the upper portion of the valve member is communicated with the valve port side in the lower portion of the valve member by the pressure equalizing passage provided in the valve member, and the upper portion and the lower portion of the valve member are made to have the same pressure, thereby eliminating the net differential pressure applied to the valve member. Examples of such an electric valve include those disclosed in japanese patent application laid-open No. 3672380 (patent document 1) and japanese patent application laid-open No. 2017-203509 (patent document 2).
The conventional electric valve drives a valve member by a link rod that moves up and down by a screw feed mechanism with a rotor of an electric motor. On the other hand, in the pressure-balanced type electric valve, the back pressure chamber for the valve member needs to be sealed from the valve chamber or the like by the sealing portion at a portion of the guide surface for guiding the valve member. Therefore, the valve member always generates sliding resistance due to the seal portion, and the valve member is not rotated even when operated. As a result, the valve member is held by a rotating bearing such as a bearing.
Prior art literature
Patent literature
Patent document 1: japanese patent No. 3672380
Patent document 2: japanese patent application laid-open No. 2017-203509
Disclosure of Invention
Problems to be solved by the invention
In the conventional motor-operated valve described above, the use of the bearing as the swivel bearing reduces torque loss in the seat portion, thereby improving the workability. However, in the device of patent document 1, the fluid is caused to flow from the valve port side to the back pressure chamber side in the housing with the bearing as a flow path. Therefore, foreign substances, sludge, and the like in the fluid may intrude into the bearing. When foreign matter intrudes into the bearing, sliding loss occurs during rotation, and there is a possibility that the operability of the electric valve is affected. In the device of patent document 2, although a pressure equalizing flow path is provided in the valve shaft (connecting rod), a bearing is directly disposed in the flow path, and in particular, when fluid flows from the joint pipe on the valve port side (lower side) to the joint pipe on the valve chamber side (side), foreign matter may intrude.
The invention provides an electric valve which can prevent foreign matters in fluid from entering a rotary bearing and ensure high operability by maintaining pressure balance type of valve component via the rotary bearing.
Means for solving the problems
The electrically operated valve according to claim 1 is characterized in that the valve opening is opened and closed by a valve member that is interlocked with the operation shaft in a valve chamber of the valve housing, and the electrically operated valve includes: a valve frame portion having a rotary bearing coupled to the working shaft and holding the valve member on a side opposite to the rotary bearing; and a bracket guide portion that guides the valve frame portion, wherein the valve frame portion includes a cylindrical cover member that is inserted into a guide hole of the bracket guide portion and that surrounds the swivel bearing.
The electrically operated valve according to claim 2 is the electrically operated valve according to claim 1, wherein the electrically operated valve is a pressure balance type in which the fluid pressure in the back pressure chamber of the valve member is uniform with the fluid pressure in the valve port.
The electrically operated valve according to claim 3 is the electrically operated valve according to claim 2, wherein: the rotor of the electric motor is housed in a sealed housing, the sealed housing is assembled to the valve housing in an airtight manner, the working shaft is moved in an axial direction via a screw feed mechanism by rotation of the rotor, and the electric motor is provided with a valve guide portion in which the valve member is inserted and disposed in the valve chamber, and a seal portion that seals the valve chamber and the back pressure chamber between the valve guide portion and the valve member, and is configured to: the valve frame portion is guided by the bracket guide portion in the back pressure chamber sealed with respect to the valve chamber by the seal portion, and a flow path for flowing fluid from the back pressure chamber to the airtight housing is provided on an outer periphery of the bracket guide portion.
The electrically operated valve according to claim 4 is the electrically operated valve according to claim 3, wherein the holder guide and the working shaft together form the screw feed mechanism.
The refrigeration cycle system according to claim 5 is a refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the electric valve according to any one of claims 1 to 4 is used as the expansion valve.
The effects of the invention are as follows.
According to the electric valve of claims 1 to 4, since the cover member of the valve frame portion is inserted into the guide hole of the bracket guide portion and surrounds the swivel bearing, the flow of the fluid flowing into the back pressure chamber for the valve member to the swivel bearing can be prevented by the cover member, intrusion of foreign matters or the like in the fluid to the swivel bearing can be prevented, and high workability can be ensured.
According to the refrigeration cycle system of claim 5, the same effects as those of the schemes 1 to 4 are obtained.
Drawings
Fig. 1 is a longitudinal sectional view of an electrically operated valve according to an embodiment of the present invention.
Fig. 2 is a main part enlarged view of the electric valve according to the embodiment and a view showing an example of the flow of fluid.
Fig. 3 is an enlarged cross-sectional view of A-A of fig. 1.
Fig. 4 is a diagram showing a refrigeration cycle system according to an embodiment.
In the figure:
1-valve housing, 1A-valve housing, 11-joint pipe, 13-valve seat member, 13 a-valve port, 13 b-tapered portion, 12-joint pipe, 2-valve member, 2 a-longitudinal pressure equalizing path (pressure equalizing path), 2 b-transverse pressure equalizing path (pressure equalizing path), 21-valve body portion, 21A-flow control portion, 21A-inner space, 22-boss portion, 23-coupling portion, 3-valve frame portion, 31-bearing (swivel bearing), 31A-inner ring, 31 b-outer ring, 31 c-ball, 32-cylinder housing (cover member), 33-guide, 34-stationary metal part, 35-valve-side sleeve, 36-coil spring, 37-shaft-side sleeve, 4-support member (bracket guide portion), 41-press-in portion, 41A-flow path, 42-guide portion, 42 a-guide hole, 43-screw holder portion, 43 a-female screw portion, 44-flange portion, 44 a-flow path, 5-step motor (electric motor), 51-rotor shaft (working shaft), 51A-male screw portion, 52-magnetic rotor, 53-stator coil, 6-sealed housing, 7-valve guide portion, 7A-back pressure chamber, 71-cylindrical portion, 72-guide portion, 73-seal portion, 73 a-leaf spring, 73 b-L-shaped gasket, 73 c-reinforcing plate, X-axis, 100-electric valve, 200-outdoor heat exchanger, 300-indoor heat exchanger, 400-flow path switching valve, 500-compressor.
Detailed Description
Next, embodiments of the electrically operated valve and the refrigeration cycle system according to the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of an electrically operated valve according to an embodiment, fig. 2 is a main part enlarged view of the electrically operated valve according to an embodiment and a view showing an example of fluid flow, and fig. 3 is an enlarged sectional view of A-A of fig. 1. The concept of "up and down" in the following description corresponds to up and down in the drawings of fig. 1 and 2.
The electric valve 100 includes a valve housing 1, a valve member 2, a valve frame 3, a support member 4 serving as a "bracket guide", a stepping motor 5 serving as an "electric motor", a sealed housing 6, and a valve guide 7. The valve housing 1 is formed of metal such as brass or stainless steel, and has a substantially cylindrical shape, and has a valve chamber 1A on the inner side thereof. A joint pipe 11 communicating with the valve chamber 1A from the side surface is attached to the valve housing 1, and a valve seat member 13 is attached to the lower end portion. A circular valve port 13a is formed in the center of the valve seat member 13, a mortar-shaped tapered portion 13b is formed around the opening of the valve port 13a, and a tapered flow rate control portion 21a formed at the front end of the valve member 2 is in contact with the upper opening end of the valve port 13a when the valve is closed. The joint pipe 12 is attached to the valve seat member 13 in the direction of the axis X of the valve chamber 1A so as to communicate with the valve port 13a.
The valve member 2 is formed in a substantially cylindrical shape having a piston shape as a whole, and the valve member 2 includes a hollow cylindrical valve core portion 21 having an inner space 21A, a boss portion 22 protruding from the valve core portion 21 toward the valve frame portion 3 side, and a connecting portion 23 having a diameter smaller than that of the boss portion 22. A vertical pressure equalizing passage 2a extending upward from the inner space 21A is formed at the upper top of the valve body 21 and the center of the boss 22, and a horizontal pressure equalizing passage 2b connected to the vertical pressure equalizing passage 2a and opening at the outer periphery of the boss 22 is formed at the boss 22.
The valve frame 3 includes a bearing 31 serving as a "swivel bearing", a cylindrical housing 32 serving as a "cover member", a guide 33 disposed between the bearing 31 and the cylindrical housing 32, a fixing metal part 34 fixed to a lower end of the cylindrical housing 32, a valve side sleeve 35 in contact with the fixing metal part 34, a coil spring 36 disposed between the valve side sleeve 35 and the bearing 31, and a shaft side sleeve 37.
The bearing 31 is composed of an inner ring 31a, an outer ring 31b, and a plurality of balls 31c, and the coil spring 36 is in contact with the outer ring 31 b. The rotor shaft 51 described later is fitted into the inner ring 31a, the flange portion 51b of the rotor shaft 51 is abutted against the inner ring 31a, and the shaft-side sleeve 37 is fixed to the lower end portion of the rotor shaft 51 by welding. Further, the guide 33 is pressed against the inner flange portion of the upper end of the cylindrical housing 32 by the urging force of the coil spring 36 to urge the outer ring 31b of the upper Fang Duizhou bearing 31 upward. Thereby, the cylinder housing 32 and the rotor shaft 51 are free to rotate relative to each other about the axis X.
The boss portion 22 of the valve member 2 is inserted into the insertion hole 34a of the fixing metal part 34, and the valve-side sleeve 35 is fitted into the coupling portion 23 of the valve member 2. The valve-side sleeve 35 and the coupling portion 23 are fixed by welding. The valve-side sleeve 35 is pressed against the stationary metal part 34 by the biasing force of the coil spring 36. Thereby, the valve member 2 is held on the opposite side of the valve frame portion 3 from the bearing 31.
The support member 4 as a "bracket guide" is attached to an opening portion at the upper end of the valve guide 7. The support member 4 includes a press-fit portion 41 press-fitted into the inner peripheral surface of the valve guide portion 7, a substantially cylindrical guide portion 42 located inside the press-fit portion 41, a screw bracket portion 43 extending from an upper portion of the guide portion 42, and an annular flange portion 44 located on an outer periphery of the guide portion 42. The press-fitting portion 41 is formed to protrude in four directions about the axis X, but is shown in fig. 1 and 2 in a position rotated by 45 ° by a virtual line. The press-fitting portion 41, the guide portion 42, and the screw holder portion 43 are formed as a resin integrated product. The flange 44 is a flat plate having an annular disk shape centered on the axis X, and is made of a metal plate such as brass or stainless steel. The flange portion 44 is integrally provided with the resin press-fitting portion 41, the guide portion 42, and the screw bracket portion 43 by insert molding.
The support member 4 is assembled to the valve guide 7, and is fixed to the upper end portion of the valve guide 7 via the flange 44 by welding. In the support member 4, a cylindrical guide hole 42a coaxial with the axis X is formed in the guide portion 42, and a female screw portion 43a coaxial with the guide hole 42a and a screw hole thereof are formed in the center of the screw bracket portion 43. As shown in fig. 3, a flow path 41a is formed between two adjacent press-fit portions 41, 41 so as to be separated from the valve guide 7, and a flow path 44a is formed in a position corresponding to the flow path 41a in the flange portion 44. The flow paths 41a and 44a are flow paths for allowing fluid to flow from the inside of the valve guide 7 into the sealed housing 6.
The stepping motor 5 includes a rotor shaft 51 serving as a "working shaft", a magnetic rotor 52 rotatably disposed in the sealed housing 6, a stator coil 53 disposed on the outer periphery of the sealed housing 6 so as to face the magnetic rotor 52, and other not-shown yokes, exterior members, and the like. The rotor shaft 51 is attached to the center of the magnetic rotor 52 via a bush, and a male screw portion 51a is formed on the outer periphery of the rotor shaft 51 on the support member 4 side. The male screw portion 51a is screwed with the female screw portion 43a of the support member 4. Thereby, the support member 4 supports the rotor shaft 51 on the axis X.
The airtight housing 6 is formed in a substantially cylindrical shape with an upper end portion thereof closed, and is fixed to an upper end of the valve guide 7 in an airtight manner by welding. A sleeve 61 is provided on the inner top surface of the airtight housing 6, and a guide 62 is provided in the center of the sleeve 61. Further, the upper end portion of the rotor shaft 51 is supported by a guide 62. Further, a rotation limiting mechanism 63 is provided on the outer periphery of the sleeve 61.
The valve guide 7 includes a cylindrical portion 71 fitted and fixed to the upper half of the valve housing 1 around the axis X, a guide portion 72 fixed to the valve port 13a side of the cylindrical portion 71, and a seal portion 73 fixed by being sandwiched between the cylindrical portion 71 and the guide portion 72. The valve core 21 of the valve member 2 is mainly disposed in the guide portion 72, and is fitted and inserted in the seal portion 73. The seal portion 73 includes a pair of flat springs 73a formed of a thin and annular metal plate, a pair of L-shaped gaskets 73b formed of a fluororesin such as PTFE or PFA and annular, and an annular reinforcing plate 73c formed of a metal plate. The reinforcing plate 73c is sandwiched between the L-shaped spacers 73b, and the plate spring 73a is fitted to overlap the L-shaped spacers 73 b. Then, the plate spring 73a is pressed by the cylindrical portion 71 and the guide portion 72, and the sealing portion 73 is attached in this state.
As described above, the back pressure chamber 7A for the valve member 3 is formed in the cylindrical portion 71 by accommodating a part of the valve member 2 in the valve guide 7 in a state where the sealing portion 73 is in close contact with the outer periphery of the valve core 21, thereby dividing the inner space of the valve guide 7.
A coil spring 74 is disposed in the back pressure chamber 7A, and the coil spring 74 is disposed in a compressed state between a spring seat 75 provided in a shoulder portion of the valve core 21 and the press-fitting portion 41 of the support member 4. The valve frame 3 and the rotor shaft 51 (the external screw portion 51a thereof) are always biased toward the valve port 13a with respect to the support member 4 (the internal screw portion 43a thereof) by the biasing force of the coil spring 74. This can reduce the hysteresis, which is the difference between the flow rate characteristics when the valve is closed and opened and the flow rate characteristics when the valve is opened and closed.
According to the above configuration, the magnetic rotor 52 and the rotor shaft 51 are rotated by the driving of the stepping motor 5, and the rotor shaft 51, the valve frame 3, and the valve member 2 are moved up and down in the axis X direction by the screw feeding mechanism of the male screw portion 51a and the female screw portion 43 a. Thereby, the valve member 2 is guided by the valve guide 7 and unseats/seats against the tapered portion 13b of the valve seat member 13. Thereby opening and closing the valve opening 13a. Further, although the rotor shaft 51 rotates around the axis X by this screw feed mechanism, the rotational force is not transmitted to the valve member 2 due to the function of the bearing 31 as a "swivel bearing".
The electric valve of this embodiment is used for controlling, for example, a first flow in which a fluid (refrigerant) flows in from the joint pipe 11 and out from the joint pipe 12, and a second flow in which a fluid flows in from the joint pipe 12 and out from the joint pipe 11. That is, in the first flow, the joint pipe 11 is an inflow port, the joint pipe 12 is an outflow port, and in the second flow, the joint pipe 12 is an inflow port, and the joint pipe 11 is an outflow port. Here, the inner space 21A, the vertical pressure equalizing passage 2a, and the horizontal pressure equalizing passage 2b of the valve member 2 are configured as "pressure equalizing passages" that communicate the valve port 13a with the back pressure chamber 7A to equalize the pressures. Thus, in the first flow, the low pressure of the valve port 13a is introduced into the back pressure chamber 7A via the "pressure equalizing passage". In the second flow, the high pressure on the valve port 13a side is introduced into the back pressure chamber 7A through the "pressure equalizing passage". Therefore, the same pressure acts on the valve member 2 from both sides of the valve port 13a and the back pressure chamber 7A. Thereby, the force generated by the differential pressure between the high pressure and the low pressure of the fluid is offset in the direction of the axis X with respect to the valve member 2, and the pressure balance is maintained.
Here, when the valve member 2 is seated on the valve seat member 13 and the second flow is performed, the high-pressure fluid from the valve port 13a flows into the back pressure chamber 7A through the inner space 21A, the vertical pressure equalizing passage 2a, and the horizontal pressure equalizing passage 2b, but flows into the sealed housing 6 through the flow passages 41A and 44a. And, the air also flows into the guide hole 42a of the support member 4 through the gap between the cylindrical housing 32 and the guide portion 42. However, the flow rate flowing into the sealed case 6 through the flow paths 41a and 44a is overwhelmingly higher than the flow rate flowing into the guide hole 42 a. This is because of the following reasons: since the volume inside the hermetic enclosure 6 is large, the pressure difference between the inside of the hermetic enclosure 6 and the inside of the back pressure chamber 7A is large in the initial stage. The high pressure is also applied to the guide hole 42a, so that the pressure in the guide hole 42a is the same as the pressure in the back pressure chamber 7A.
In this way, as shown by the arrows in fig. 2, the flow of the high-pressure fluid bypasses the valve frame 3 and flows to the outside thereof. In the valve housing 3, the bearing 31 is surrounded by a cylindrical housing 32 serving as a "cover member". Therefore, intrusion of foreign matter or the like into the bearing 31 can be prevented.
Fig. 4 is a diagram showing a refrigeration cycle system according to an embodiment. In the drawings, reference numeral 100 denotes an electric valve according to each embodiment of the present invention, which constitutes an expansion valve, 200 denotes an outdoor heat exchanger mounted in an outdoor unit, 300 denotes an indoor heat exchanger mounted in an indoor unit, 400 denotes a flow path switching valve constituting a four-way valve, and 500 denotes a compressor. The motor valve 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are connected by pipes as shown in the drawing, respectively, to constitute a heat pump refrigeration cycle. The illustration of the reservoir, the pressure sensor, the temperature sensor, and the like is omitted.
The flow path of the refrigeration cycle is switched by the flow path switching valve 400 to both of the flow path during cooling operation and the flow path during heating operation. In the cooling operation, as shown by solid arrows in the figure, the refrigerant compressed by the compressor 500 flows into the outdoor heat exchanger 200 from the flow path switching valve 400, the outdoor heat exchanger 200 functions as a condenser, the liquid refrigerant flowing out of the outdoor heat exchanger 200 flows into the indoor heat exchanger 300 through the motor-operated valve 100, and the indoor heat exchanger 300 functions as an evaporator.
On the other hand, during the heating operation, as indicated by a broken-line arrow in the figure, the refrigerant compressed by the compressor 500 circulates from the flow path switching valve 400 to the indoor heat exchanger 300, the motor valve 100, the outdoor heat exchanger 200, the flow path switching valve 400, and the compressor 500 in this order, and the indoor heat exchanger 300 functions as a condenser and the outdoor heat exchanger 200 functions as an evaporator. The electric valve 100 decompresses and expands the liquid refrigerant flowing in from the outdoor heat exchanger 200 during the cooling operation or the liquid refrigerant flowing in from the indoor heat exchanger 300 during the heating operation, and controls the flow rate of the refrigerant.
In the above embodiment, the flow paths 41a and 44a are provided on the outer periphery of the guide portion 42 of the support member 4, but for example, a flow path may be formed in which the fluid flows from the center of the valve member 2 to the inside of the valve frame portion 3, the inside of the inner ring 31a of the bearing 31, and the center of the rotor shaft 51, and flows from the valve port 13a to the closed casing 6.
In the above embodiment, the female screw portion 43a is formed in the support member 4, the male screw portion 51a is formed in the rotor shaft 51, and the male screw portion 51a is screwed with the female screw portion 43a to constitute the screw feeding mechanism, but the screw feeding mechanism is not limited to the combination of the screws, but the male screw portion may be formed in the same member as the support member, the female screw portion may be formed in the magnetic rotor side, and the electric valve may be formed such that the female screw and the male screw are arranged opposite to each other.
The embodiments of the present invention have been described in detail above with reference to the drawings, but the specific configuration is not limited to the above embodiments, and the present invention also includes design changes and the like within the scope not departing from the gist of the present invention.
Claims (3)
1. An electric valve for opening and closing a valve opening by a valve member interlocked with an operation shaft in a valve chamber of a valve housing, the electric valve comprising:
a valve frame portion having a rotary bearing coupled to the working shaft and holding the valve member on a side opposite to the rotary bearing; and
a bracket guide part for guiding the valve frame part,
the valve frame part is provided with a cylindrical cover member which is inserted into the guide hole of the bracket guide part and surrounds the rotary bearing,
the electric valve is a pressure balance type valve which makes the fluid pressure of the back pressure chamber of the valve component and the fluid pressure of the valve port uniform,
the rotor of the electric motor is housed in a hermetic casing and the hermetic casing is assembled in an airtight manner to the valve housing,
the working shaft is moved in the axial direction by the rotation of the rotor via a screw feed mechanism, and,
the electric valve includes a valve guide portion, in which the valve member is inserted and disposed in the valve chamber, and a seal portion, which seals the valve chamber and the back pressure chamber between the valve guide portion and the valve member,
the sealing part is in sliding contact with the outer periphery of the valve member,
the valve frame portion is guided by the bracket guide portion in the back pressure chamber sealed from the valve chamber by the seal portion, and a flow path for flowing fluid from the back pressure chamber to the airtight housing is provided on an outer periphery of the bracket guide portion.
2. The electrically operated valve as set forth in claim 1, wherein,
the bracket guide portion and the working shaft together form the screw feeding mechanism.
3. A refrigeration cycle system comprises a compressor, a condenser, an expansion valve and an evaporator, and is characterized in that,
use of the electrically operated valve according to claim 1 or 2 as the expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111564601.1A CN114233878B (en) | 2018-06-20 | 2019-06-03 | Electric valve and refrigeration cycle system |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018116926A JP6889685B2 (en) | 2018-06-20 | 2018-06-20 | Electric valve and refrigeration cycle system |
| JP2018-116926 | 2018-06-20 | ||
| CN202111564601.1A CN114233878B (en) | 2018-06-20 | 2019-06-03 | Electric valve and refrigeration cycle system |
| CN201910476516.6A CN110617337B (en) | 2018-06-20 | 2019-06-03 | Electric valve and refrigeration cycle system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910476516.6A Division CN110617337B (en) | 2018-06-20 | 2019-06-03 | Electric valve and refrigeration cycle system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114233878A CN114233878A (en) | 2022-03-25 |
| CN114233878B true CN114233878B (en) | 2024-01-30 |
Family
ID=68921340
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111564601.1A Active CN114233878B (en) | 2018-06-20 | 2019-06-03 | Electric valve and refrigeration cycle system |
| CN201910476516.6A Active CN110617337B (en) | 2018-06-20 | 2019-06-03 | Electric valve and refrigeration cycle system |
| CN202111564811.0A Pending CN114233879A (en) | 2018-06-20 | 2019-06-03 | Electric valve and refrigeration cycle system |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910476516.6A Active CN110617337B (en) | 2018-06-20 | 2019-06-03 | Electric valve and refrigeration cycle system |
| CN202111564811.0A Pending CN114233879A (en) | 2018-06-20 | 2019-06-03 | Electric valve and refrigeration cycle system |
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| JP (1) | JP6889685B2 (en) |
| CN (3) | CN114233878B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11796234B2 (en) * | 2018-12-25 | 2023-10-24 | Zhejiang Dunan Artificial Environment Co., Ltd. | Electronic expansion valve and air conditioning system with electronic expansion valve |
| JP7453091B2 (en) * | 2020-08-18 | 2024-03-19 | 株式会社鷺宮製作所 | Electric valve and refrigeration cycle system |
| JP7362569B2 (en) * | 2020-08-20 | 2023-10-17 | 株式会社鷺宮製作所 | Electric valve and refrigeration cycle system |
| CN114607782B (en) * | 2022-01-26 | 2023-01-31 | 广东威灵电机制造有限公司 | Electronic expansion valve and refrigeration equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110617337B (en) | 2021-11-16 |
| CN114233878A (en) | 2022-03-25 |
| JP6889685B2 (en) | 2021-06-18 |
| JP2019219007A (en) | 2019-12-26 |
| CN114233879A (en) | 2022-03-25 |
| CN110617337A (en) | 2019-12-27 |
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