CN113883284B - Electric valve and refrigeration cycle system - Google Patents
Electric valve and refrigeration cycle system Download PDFInfo
- Publication number
- CN113883284B CN113883284B CN202110686206.4A CN202110686206A CN113883284B CN 113883284 B CN113883284 B CN 113883284B CN 202110686206 A CN202110686206 A CN 202110686206A CN 113883284 B CN113883284 B CN 113883284B
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- Prior art keywords
- valve
- sub
- port
- valve port
- opening
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 37
- 238000004891 communication Methods 0.000 claims abstract description 21
- 238000005192 partition Methods 0.000 claims description 33
- 238000007791 dehumidification Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 39
- 238000011144 upstream manufacturing Methods 0.000 abstract description 6
- 238000012986 modification Methods 0.000 description 12
- 230000004048 modification Effects 0.000 description 12
- 238000013459 approach Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000036962 time dependent Effects 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
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
-
- 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
-
- 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
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
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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)
- Electrically Driven Valve-Operating Means (AREA)
- Lift Valve (AREA)
Abstract
The invention provides an electric valve capable of reducing noise and a refrigeration cycle system provided with the same. An electrically operated valve (1) is provided with: a valve housing (2); a main valve body (4) that changes the opening of a main valve opening (23 a) provided in a main valve chamber (2R) of a valve housing (2); a sub valve body (5) that changes the opening of a sub valve port (41 b) provided in a sub valve chamber (4R) of the main valve body (4); and a driving section (6) that drives the sub valve element (5) to advance and retreat in the Z direction, wherein the sub valve port (41 a) has an upper end (412A) as an opening end and a tubular inner peripheral surface (413) as a small diameter section. Thus, the rectifying portion can be formed upstream of the minimum throttling portion, and when the fluid flows into the sub-valve chamber (4R) through the first port (21) and the communication hole (421), even when the flow rate becomes unstable, the noise can be reduced by rectifying the fluid.
Description
Technical Field
The present invention relates to an electrically operated valve and a refrigeration cycle system.
Background
An electric valve has been proposed in which the opening degree of a main valve port can be changed by a main spool, and the opening degree of a sub valve port provided in the main spool can be changed by a sub spool (for example, refer to patent document 1). In the electric valve described in patent document 1, the main spool includes a main valve portion, a holding portion including a cylindrical needle guide hole, and a sub valve seat, and a part of the lower side of the needle guide hole is a sub valve chamber. When the sub valve body opens the sub valve port, the main valve chamber, the sub valve port, and the main valve port are connected by forming the through hole in the side surface of the holding portion.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2020-034141
Disclosure of Invention
Problems to be solved by the invention
In the electrically operated valve described in patent document 1, a joint is connected to a cylindrical valve housing having a main valve chamber on one side surface and one end side in the axial direction. When the side joint is the primary side, as described above, if the secondary valve port is opened, the fluid flowing in from the joint flows out from the joint on one end side through the secondary valve port and the primary valve port after passing through the side through hole of the holding portion. In this case, if the main valve body is rotatable, the positional relationship between the side joint and the through hole may change, and the flow rate of the fluid passing through the sub valve port may change with time. Even if the main valve body does not rotate, the flow rate of the fluid passing through the side passage hole of the holding portion may be different between a position closer to the side joint and a position farther from the side joint, and thus the flow rate of the fluid passing through the sub valve port may be uneven depending on the position. In this way, the flow rate of the fluid passing through the sub-valve port may become unstable in time or space (hereinafter, the time-dependent variation of the flow rate and the position unevenness are collectively referred to simply as "instability"), and such instability may become a factor of noise.
The invention aims to provide an electric valve capable of reducing noise and a refrigeration cycle system with the electric valve.
Means for solving the problems
The electric valve of the present invention comprises: a valve housing; a main valve body that changes the opening of a main valve opening provided in a main valve chamber of the valve housing; a sub valve body that changes an opening degree of a sub valve port provided in a sub valve chamber of the main valve body; and a driving portion that drives the sub valve body to advance and retreat in an axial direction, wherein the valve housing includes a first port that opens in a direction intersecting the axial direction and a second port that communicates with the main valve port and opens in the axial direction, the main valve body includes a partition wall portion that extends in the direction intersecting the axial direction and that is close to or apart from the sub valve body, a tubular portion that extends from the partition wall portion toward a side opposite to the main valve port and that forms the sub valve chamber from the partition wall portion and the tubular portion, at least one communication hole that communicates an inside and an outside thereof is formed in the tubular portion, and the sub valve port includes an opening end portion that is a through hole formed in the partition wall portion and is an end portion on a side opposite to the main valve port, and a small diameter portion that is located on the main valve port side of the opening end portion and that is formed to have a diameter smaller than that of the opening end portion.
According to the above-described invention, since the sub valve port has the open end portion and the small diameter portion, the space between the sub valve element and the open end portion can be made larger than the space between the sub valve element and the small diameter portion. When fluid flows from the secondary valve chamber to the primary valve port side through the secondary valve port, the fluid passes through a space between the secondary valve body and the small diameter portion after passing through a space between the secondary valve body and the open end portion. In this case, the space between the sub valve element and the small diameter portion becomes a throttle portion to determine a substantial valve opening degree (opening area), and a larger space is provided upstream of the throttle portion, that is, the space can temporarily rectify the fluid at a position upstream of the throttle portion. Therefore, even when the flow rate becomes unstable when the fluid flows into the sub-valve chamber through the first port and the communication hole of the valve housing, the noise can be reduced by rectifying the fluid.
In this case, in the electrically operated valve according to the present invention, it is preferable that the sub-valve port has a tapered portion having an inner diameter that decreases toward the main valve port side between the opening end portion and the small diameter portion. According to this structure, the fluid easily flows along the tapered portion, and disturbance of the fluid flow can be suppressed.
In the electrically operated valve according to the present invention, it is preferable that the sub-valve port has a stepped portion between the opening end portion and the small diameter portion, the stepped portion being formed of a cylindrical inner peripheral surface extending in the axial direction and an annular portion extending radially inward from the end portion of the cylindrical inner peripheral surface on the main valve port side. According to this structure, the volume of the space between the cylindrical portion and the sub-valve body is easily secured, and the fluid can be easily rectified.
In the electric valve according to the present invention, it is preferable that the small diameter portion is provided on the main valve port side of the axial center portion of the partition wall portion, and is a portion having the smallest inner diameter in the sub valve port. According to such a configuration, the volume can be increased by securing the axial dimension of the space for rectifying the fluid, and the fluid can be easily rectified.
The refrigeration cycle system according to the present invention includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, an electronic expansion valve provided between the indoor heat exchanger and the outdoor heat exchanger, and a dehumidification valve provided in the indoor heat exchanger, and is characterized in that the electric valve described in any one of the above is used as the dehumidification valve. According to the present invention described above, noise can be reduced in the motor-operated valve.
The effects of the invention are as follows.
According to the electric valve and the refrigeration cycle system of the present invention, noise can be reduced.
Drawings
Fig. 1 is a cross-sectional view showing an electrically operated valve according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view showing an enlarged main portion of the electric valve when the opening of the sub-valve port is minimized.
Fig. 3 is a cross-sectional view showing an enlarged main portion of the electric valve when the opening of the sub-valve port is intermediate.
Fig. 4 is a cross-sectional view showing an enlarged main portion of the electric valve when the opening of the sub-valve port is maximized.
Fig. 5 is a cross-sectional view showing a cross-section through the cylindrical portion in the above-described electrically operated valve.
Fig. 6 is a system diagram showing an example of a refrigeration cycle system provided with the above-described motor-operated valve.
Fig. 7 is an enlarged cross-sectional view showing a main portion of the electrically operated valve according to the first modification in which the opening degree of the sub-valve port is minimized.
Fig. 8 is a cross-sectional view showing an enlarged main portion of the electric valve according to the first modification, in which the opening degree of the sub-valve port is maximized.
Fig. 9 is a cross-sectional view showing an enlarged main portion of the second modified example in which the opening degree of the sub-valve port is minimized.
Fig. 10 is a cross-sectional view showing an enlarged main portion of the second modified example in which the opening degree of the sub-valve port is intermediate.
Fig. 11 is a cross-sectional view showing an enlarged main portion of the second modified example in which the opening degree of the sub-valve port is maximized.
Fig. 12 is a cross-sectional view showing an enlarged main portion of the electric valve according to the above embodiment, in which the valve opening of the sub-valve port is set to 0.
Fig. 13 is a cross-sectional view showing an enlarged main portion of the electric valve according to the first modification, in which the valve opening of the sub-valve port is set to 0.
Fig. 14 is a cross-sectional view showing an enlarged main portion of the electric valve according to the second modification, in which the valve opening of the sub-valve port is set to 0.
In the figure:
1-electric valve, 2-valve housing, 21-first port, 22-second port, 23 a-main valve opening, 2R-main valve chamber, 4-main valve element, 41-partition wall portion, 41a, 41 b-auxiliary valve opening, 412-taper portion, 412A-upper end portion (open end portion), 413-cylindrical inner peripheral surface (small diameter portion), 414-cylindrical inner peripheral surface, 415-annular portion, 416-step portion, 42-cylindrical portion, 421-communication hole, 4R-auxiliary valve chamber, 5-auxiliary valve element, 6-drive portion, 91-first indoor heat exchanger, 92-second indoor heat exchanger, 93-electronic expansion valve, 94-outdoor heat exchanger.
Detailed Description
Embodiments of the present invention will be described with reference to the accompanying drawings. The motor-operated valve 1 of the present embodiment is used in a refrigeration cycle system of an air conditioner such as a cabinet air conditioner or an indoor air conditioner, and includes, as shown in fig. 1, a valve housing 2, a guide member 3, a main valve body 4, a sub valve body 5, and a driving unit 6. The main valve body 4 and the sub valve body 5 are moved in a predetermined axial direction, and the axial direction is hereinafter referred to as a Z direction, and two directions orthogonal to the Z direction are referred to as an X direction and a Y direction, and the up and down of the Z direction are based on fig. 1.
The valve housing 2 is formed in a substantially cylindrical shape, for example, of brass, stainless steel, or the like, and has a main valve chamber 2R inside thereof. The valve housing 2 has a first port 21 opening to one side in the X direction and a second port 22 opening to the lower side in the Z direction on its side surfaces. The first port 21 is connected to the first joint pipe 11 extending in the X direction, the second port 22 is connected to the second joint pipe 12 extending in the Z direction, and the first joint pipe 11 and the second joint pipe 12 communicate with the main valve chamber 2R. The first joint pipe 11 and the second joint pipe 12 may be fixed to the valve housing 2 by brazing or the like, for example.
A cylindrical main valve seat 23 protruding toward the main valve chamber 2R (upward) in the Z direction is formed at the lower end of the valve housing 2, and the inside of the main valve seat 23 serves as a main valve port 23a, and the main valve port 23a communicates with the second port 22. That is, the second joint pipe 12 is in communication with the main valve chamber 2R via the main valve port 23 a. In the present embodiment, the electric valve 1 has the first port 21 as the primary side and the second port 22 as the secondary side, and is configured to allow the fluid (refrigerant) flowing from the first joint pipe 11 into the main valve chamber 2R to flow out from the second joint pipe 12, but the electric valve 1 may be incorporated in a cycle in which the fluid can flow in both directions.
The guide member 3 is attached to an opening at the upper end of the valve housing 2, and includes: a press-fit portion 31 that is press-fitted into the inner peripheral surface of the valve housing 2; a substantially cylindrical guide portion 32 located inside the press-fitting portion 31; a bracket 33 extending from an upper portion of the guide 32; and an annular flange portion 34 located on the outer periphery of the guide portion 32. The press-fitting portion 31, the guide portion 32, and the bracket portion 33 are formed as a single piece made of resin. The flange 34 is made of, for example, a metal plate made of brass, stainless steel, or the like, and the flange 34 is integrally provided with the resin press-fitting portion 31 and the bracket 33 by insert molding.
The guide member 3 is assembled to the valve housing 2, and is fixed to the upper end portion of the valve housing 2 by welding at the flange portion 34. In the guide member 3, a cylindrical guide hole 32a is formed in the guide portion 32 in the axial direction in the Z direction, and a female screw portion (screw hole) 33a coaxial with the guide hole 32a is formed in the center of the holder portion 33.
The main valve body 4 is disposed in the guide hole 32a of the holder 33, and is formed in a cylindrical shape with the Z direction as the axial direction. The main valve element 4 integrally includes: a partition wall 41 extending along the XY plane and configured to allow the sub-valve body 5 to approach or separate from the sub-valve body; a cylindrical portion 42 extending from the partition wall portion 41 toward the opposite side (upper side) of the main valve port 23 a; and a main valve portion 43 that is close to or remote from the main valve seat 23.
The partition wall 41 is a sub-valve seat portion provided at the lower end of the tubular portion 42, and is formed in a plate shape having a predetermined plate thickness (Z-direction dimension). A bottom cylindrical portion is formed by the partition wall portion 41 and the cylindrical portion 42, and the inside of the bottom cylindrical portion becomes the sub valve chamber 4R. A sub-valve port 41a as a through hole is formed in the center of the partition wall 41. The cylindrical portion 42 is formed in a cylindrical shape, and its inner peripheral surface becomes a needle guide hole 42a. A washer 53 and a guide boss 54 attached to a valve shaft 51 described below are inserted into the needle guide hole 42a of the cylindrical portion 42, and an annular stopper 44 is fixed to the upper end of the cylindrical portion 42 by fitting, welding, or the like. A main valve spring 4a is disposed between the stopper 44 and the upper end portion of the guide hole 32a, and the main valve spring 4a biases the main valve spool 4 in the direction of the main valve seat 23 (lower side in the Z direction; closing direction).
As shown in fig. 5, a plurality of (in the present embodiment, four, or more than one) communication holes 421 for communicating the inside and the outside are formed in the cylindrical portion 42. The four communication holes 421 are arranged at equal intervals in the circumferential direction around the Z direction. In fig. 5, although two communication holes 421 are aligned in the X direction and two other communication holes 421 are aligned in the Y direction, the main valve body 4 is rotatable with respect to the valve housing 2, and the position of the communication holes 421 may be changed by rotation of the main valve body 4. That is, the positional relationship of the communication hole 421 and the first port 21 may vary. The main valve chamber 2R, the sub valve chamber 4R, the sub valve port 41a, and the main valve port 23a are communicated by forming the communication hole 421 in the tubular portion 42.
The main valve portion 43 is formed in a substantially cylindrical shape such that the cylindrical portion 42 extends downward from the partition wall portion 41. The main valve portion 43 may be seated (abutted) against the main valve seat 23 in the fully closed state or may be slightly distant from it.
The sub valve element 5 is a needle valve provided at a lower end portion of a rotor shaft 61 described below, and integrally includes a valve shaft 51 connected to the rotor shaft 61 side and a needle portion 52 connected to a lower end of the valve shaft 51. The sub valve element 5 further includes an annular packing 53 disposed on the valve shaft 51 and a guide boss 54 fixed to the valve shaft 51. The guide boss 54 is fixed separately from the valve shaft 51, but the guide boss 54 may be formed integrally with the valve shaft 51. The washer 53 and the guide boss 54 are slidably inserted into the needle guide hole 42a.
The driving unit 6 is provided inside and outside a housing 24 fixed to the upper end of the valve housing 2, and includes a stepping motor 6A, a screw feed mechanism 6B for advancing and retreating the sub-valve body 5 by rotation of the stepping motor 6A, and a stopper mechanism 6C for restricting rotation of the stepping motor 6A. The housing 24 is fixed to the valve housing 2 in an airtight manner, for example, by welding or the like.
The stepping motor 6A is configured by a rotor shaft 61, a magnetic rotor 62 rotatably disposed in the housing 24, a stator coil 63 disposed on the outer periphery of the housing 24 so as to face the magnetic rotor 62, and other not-shown yokes, exterior members, and the like. The rotor shaft 61 is attached to the center of the magnetic rotor 62 via a bushing, and a male screw portion 61a is formed on the outer periphery of the rotor shaft 61 on the guide member 3 side. The male screw portion 61a is screw-engaged with the female screw portion 33a of the guide member 3, whereby the guide member 3 supports the rotor shaft 61 on the axis in the Z direction. The female screw portion 33a of the guide member 3 and the male screw portion 61a of the rotor shaft 61 constitute a screw feed mechanism 6B.
Here, the opening and closing operations of the main spool 4 and the sub spool 5 in the electric valve 1 will be described in detail. When the magnetic rotor 62 and the rotor shaft 61 are rotated by the drive of the stepping motor 6A, the rotor shaft 61 moves in the Z direction by the screw feed mechanism 6B of the male screw portion 61a of the rotor shaft 61 and the female screw portion 33a of the guide member 3. Thereby, the sub valve element 5 moves forward and backward in the Z direction to approach or separate from the sub valve port 41a, thereby controlling the valve opening of the sub valve port 41a. The sub valve body 5 (the washer 53) is engaged with the main valve body 4 (the stopper 44), and the main valve body 4 moves together with the sub valve body 5, and approaches or separates from the main valve seat 23. Thereby, the flow rate of the refrigerant flowing from the first joint pipe 11 toward the second joint pipe 12 is controlled.
The magnetic rotor 62 is formed with a protrusion 62a, and the protrusion 62a operates the rotation restricting mechanism 6C in accordance with the rotation of the magnetic rotor 62, thereby restricting the lowermost position and the uppermost position of the rotor shaft 61 (and the magnetic rotor 62). Fig. 1 shows a state in which the rotor shaft 61 (and the magnetic rotor 62) is located at the lowermost position.
The detailed shapes of the sub-valve port 41a and the sub-valve body 5 and their relationships will be described below with reference to fig. 2 to 4. Fig. 2 shows a state in which the sub valve element 5 is positioned at the lowermost position and the valve opening degree of the sub valve port 41a is minimum, fig. 3 shows a state in which the sub valve element 5 is positioned above the lowermost position and the valve opening degree is medium, and fig. 5 shows a state in which the sub valve element 5 is positioned at the uppermost position and the valve opening degree of the sub valve port 41a is maximum. The sub valve element 5 is not in contact with the partition wall 41 at the lowermost position, and fluid can pass through the sub valve port 41a. In the uppermost position, the lower end (tip end) of the sub valve element 5 is positioned in the sub valve port 41a.
The sub-valve port 41a has: a tapered portion 412 having an inner diameter that gradually decreases from the upper end surface 411 toward the lower side (main valve opening 23a side); and a cylindrical inner peripheral surface 413 of a cylindrical shape (constant inner diameter) extending downward from a lower end portion of the tapered portion 412. An upper end portion 412A of the tapered portion 412 is an opening end portion at an end portion of the partition wall portion 41 on the opposite side to the main valve port 23 a. The tubular inner peripheral surface 413 is located closer to the main valve opening 23a than the upper end portion 412A, and is formed to have a smaller diameter than the upper end portion 412A, thereby forming a small diameter portion. The cylindrical inner peripheral surface 413 is formed at a portion where the inner diameter is smallest at the sub-valve port 41a.
The tapered portion 412 is formed over half or more of the entire sub-valve port 41a. That is, the cylindrical inner peripheral surface 413 is located closer to the main valve opening 23a than the Z-direction central portion of the partition wall 41. The cylindrical inner peripheral surface 413 is preferably provided in a region 1/3 of the lower side in the Z direction of the partition wall 41.
The needle 52 of the sub-valve body 5 includes, in order from the upper side in the Z direction, a first straight portion 521 formed continuously with the valve shaft 51 and having a constant outer diameter, a first tapered portion 522 having a smaller outer diameter toward the lower side in the Z direction, a second straight portion 523 having a constant outer diameter, and a truncated cone-shaped second tapered portion 524 having a smaller outer diameter toward the lower side in the Z direction.
The angle of inclination of the first tapered portion 522 with respect to the Z direction is smaller than the angle of inclination of the tapered portion 412 of the sub-valve port 41a with respect to the Z direction. That is, as shown in fig. 2, in a state where the first tapered portion 522 is opposed to the tapered portion 412, the interval therebetween increases toward the upper side in the Z direction. The outer diameter of the second straight portion 523 is smaller than the inner diameter of the cylindrical inner peripheral surface 413.
In the state shown in fig. 2, the lower end portion of the first straight portion 521, the entire first tapered portion 522, the entire second straight portion 523, and the upper end portion of the second tapered portion 524 are located inside the sub-valve port 41a. The distance between the sub valve element 5 and the sub valve port 41a is smallest between the second straight portion 523 and the cylindrical inner peripheral surface 413, and this position becomes the minimum throttle portion A1. The larger the distance between the sub valve element 5 and the sub valve port 41a, the larger the cross-sectional area through which fluid can pass, and the easier the fluid can pass, and the following description will be focused on the distance between the sub valve element 5 and the sub valve port 41a. A through portion A2 is formed between the first straight portion 521 and the tapered portion 412, and a through portion A3 is formed between the first tapered portion 522 and the tapered portion 412, above the minimum throttle portion A1. At the passage A3, the distance between the sub valve element 5 and the sub valve port 41a is larger than the minimum orifice A1, and at the passage A2, the distance between the sub valve element 5 and the sub valve port 41a is larger than the passage A3.
In this way, a portion having a large distance between the sub valve element 5 and the sub valve port 41a is formed above the minimum orifice portion A1 (upstream side when the first port 21 is the primary side), and the fluid is likely to pass through this portion, so that this portion becomes a rectifying portion where the fluid is rectified. In this case, both the first passage A1 and the second passage A2 may function as the rectifying unit, or only one of them may function as the rectifying unit. That is, it is difficult to obtain the rectifying effect even when the distance between the sub valve element 5 and the sub valve port 41a is too large or too small, and a portion having an appropriate distance may be a rectifying portion. In this way, the rectifying portion may be formed at the opening end portion (upper end portion 412A), or may be formed at a position between the opening end portion and the small diameter portion. In the illustrated example, the second pass portion A2 mainly functions as a rectifying portion.
In the state shown in fig. 3, the lower portion of the first tapered portion 522, the entire second straight portion 523, and the entire second tapered portion 524 are located inside the sub-valve port 41a. The distance between the sub valve element 5 and the sub valve port 41a is smallest between the second tapered portion 524 and the upper end portion of the tubular inner peripheral surface 413 (the boundary portion with the tapered portion 412), and this position becomes the minimum throttle portion A4. As in the case of the state shown in fig. 2, a portion having a large distance between the sub valve element 5 and the sub valve port 41a is formed above the minimum orifice A4, and this portion serves as a rectifying portion. In the illustrated example, the passage portion A5 between the first tapered portion 522 or the second flat portion 523 and the tapered portion 412 mainly functions as a rectifying portion.
In the state shown in fig. 4, only the lower portion of the second tapered portion 524 is located inside the sub-valve port 41a. The distance between the sub valve element 5 and the sub valve port 41a is smallest between the tip end portion of the second tapered portion 524 and the tapered portion 412, and this position becomes the minimum throttle portion A6. That is, the minimum throttle portion is not formed on the cylindrical inner peripheral surface 413 which is the small diameter portion. As in the case of the state shown in fig. 2 and 3, a passage A7 is formed above the minimum orifice A6, and the passage A7 serves as a rectifying portion, and is a portion where the distance between the sub valve element 5 and the sub valve port 41a is large.
Since the sub-valve port 41a has the tapered portion 412, if at least a part of the needle-like portion 52 is located inside the sub-valve port 41a, a minimum throttle portion and a rectifying portion located above the minimum throttle portion are formed in the same manner as described above. That is, although the portion of the needle 52 facing the sub-valve port 41a in the XY plane changes between the state shown in fig. 3 and the state shown in fig. 5, the minimum throttle portion and the rectifying portion are formed. The sub valve element 5 may be moved beyond this range.
When the fluid flowing from the first port 21 into the main valve chamber 2R flows into the sub valve chamber 4R through the communication hole 421 of the main valve body 4, the flow rate may be different in each of the four communication holes 421. That is, there is a tendency that: the flow rate tends to increase as the communication hole 421 is closer to the first port 21 (toward the first port 21 side), and tends to decrease as the communication hole 421 is farther from the first port 21 (not toward the first port 21 side). Therefore, the flow rate of the fluid reaching the sub-port 41a through the four communication holes 421 may vary depending on the position in the vicinity of the sub-port 41a, and the flow rate of the fluid may vary.
Further, since the positional relationship between the communication hole 421 and the first port 21 may change due to rotation of the main valve body 4, the flow rate of the fluid passing through the communication hole 421 may change with time, and the flow rate of the fluid may become unstable with time in the vicinity of the sub-valve port 41a.
Even when the flow rate is spatially or temporally unstable as described above, the flow rate is regulated by the minimum throttle portion determining the substantial valve opening after the flow through the sub-port 41a is rectified by the rectifying portion.
Next, an example of a refrigeration cycle system in which the motor-operated valve 1 according to the present embodiment is provided will be described with reference to fig. 6. The refrigeration cycle system is used for an air conditioner such as a household air conditioner. The electric valve 1 is provided as a "dehumidification control valve" between a first indoor heat exchanger 91 (operating as a cooler in dehumidification) and a second indoor heat exchanger 92 (operating as a heater in dehumidification). The electric valve 1, the first indoor heat exchanger 91, the second indoor heat exchanger 92, the electronic expansion valve 93, the outdoor heat exchanger 94, the compressor 95, and the four-way valve 96 constitute a heat pump refrigeration cycle. The first indoor heat exchanger 91, the second indoor heat exchanger 92, and the electric valve 1 are installed indoors, and the electronic expansion valve 93, the outdoor heat exchanger 94, the compressor 95, and the four-way valve 96 are installed outdoors, thereby constituting a cooling and heating device.
According to the present embodiment described above, the sub-valve port 41a has the upper end portion 412A as the opening end portion and the tubular inner peripheral surface 413 as the small diameter portion, and the rectifying portion can be formed upstream of the minimum throttle portion. Therefore, when the fluid flows into the sub-valve chamber 4R through the first port 21 and the communication hole 421, even when the flow rate becomes unstable, the noise can be reduced by rectifying the fluid.
Further, since the sub-valve port 41a has the tapered portion 412, the fluid easily flows along the tapered portion 412, and disturbance of the flow of the fluid can be suppressed.
Further, by setting the cylindrical inner peripheral surface 413 as the small diameter portion to be closer to the main valve port 23a than the Z-direction central portion of the partition wall portion 41, the Z-direction dimension of the space for rectifying the fluid can be ensured to increase the volume, and the fluid can be easily rectified.
The present invention is not limited to the above-described embodiments, and includes other configurations and the like capable of achieving the objects of the present invention, and the present invention includes modifications and the like shown below. For example, in the above embodiment, the sub valve port 41a is provided with the tapered portion 412, and the sub valve element 5 is provided with the tapered portions 522 and 524, but the combination of the shapes of the sub valve port and the sub valve element is not limited thereto.
In the first modification shown in fig. 7 and 8, the sub valve port 41a has the same shape as that of the above-described embodiment, and the needle portion 52A of the sub valve body 5A has a first straight portion 521, a first tapered portion 522, and a second straight portion 525 in this order from the upper side in the Z direction. Fig. 7 shows a state in which the sub valve element 5A is positioned at the lowermost position and the valve opening of the sub valve port 41a is minimum, and fig. 8 shows a state in which the sub valve element 5A is positioned at the uppermost position and the valve opening of the sub valve port 41a is maximum. The sub valve body 5A is not in contact with the partition wall 41 at the lowermost position, and fluid can pass through the sub valve port 41a. The lower end (tip end) of the sub valve body 5A is disposed inside the sub valve port 41a at either the lowermost position or the uppermost position, and the second straight portion 525 of the needle portion 52A faces the sub valve port 41a in the XY plane when the sub valve body 5A moves between the lowermost position and the uppermost position.
In the state shown in fig. 7, a minimum throttle portion A8 is formed between the lower end portion of the second straight portion 525 and the tapered portion 412, and a passing portion A9 between the second straight portion 525 and the upper end portion 412A of the tapered portion 412 functions as a rectifying portion. Similarly, in the state shown in fig. 8, a minimum throttle portion a10 is formed between the lower end portion of the second straight portion 525 and the tapered portion 412, and a passing portion a11 between the second straight portion 525 and the upper end portion 412A of the tapered portion 412 functions as a rectifying portion.
In the first modification, the dimension in the Z direction of the cylindrical inner peripheral surface 413 is smaller than that of the above-described embodiment, but the dimension of the cylindrical inner peripheral surface may be appropriately set, or the cylindrical inner peripheral surface may be omitted so that the entirety of the sub valve port is formed as a tapered portion. Further, a cylindrical inner peripheral surface may be formed at the upper end side of the sub valve port, and a tapered portion may be formed at the lower side thereof.
In the second modification shown in fig. 9 to 11, the sub valve port 41b has a cylindrical inner peripheral surface 414 and an annular portion 415, and the sub valve element 5 has the same shape as in the above-described embodiment. Fig. 9 shows a state in which the sub valve element 5 is positioned at the lowermost position and the valve opening of the sub valve port 41b is the smallest, fig. 10 shows a state in which the sub valve element 5 is positioned above the lowermost position and the valve opening is medium, and fig. 11 shows a state in which the sub valve element 5 is positioned at the uppermost position and the valve opening of the sub valve port 41b is the largest. The sub valve element 5 is not in contact with the partition wall 41 at the lowermost position, and fluid can pass through the sub valve port 41b. In the uppermost position, the lower end (distal end) of the sub valve element 5 is disposed inside the valve port 41b.
The cylindrical inner peripheral surface 414 extends downward in the Z direction with the upper end surface 411 of the partition wall portion 41 as an opening end portion, and has a substantially constant inner diameter. The annular portion 415 is formed in a plate shape extending along the XY plane from the lower end portion of the tubular inner peripheral surface 414 toward the inner peripheral side. The annular portion 415 has an inner diameter smaller than that of the cylindrical inner peripheral surface 414, and a stepped portion 416 is formed between the cylindrical inner peripheral surface 414 and the annular portion 415. The outer diameter of the second straight portion 523 is smaller than the inner diameter of the through hole of the annular portion 415.
In the state shown in fig. 9, a minimum throttle portion a12 is formed between the second straight portion 523 and the annular portion 415, and a passage portion having a larger distance between the sub-valve port 41b and the needle portion 52 than the minimum throttle portion a12 is formed above the minimum throttle portion a 12. Of such passing portions, for example, the passing portion a13 between the first straight portion 521 and the cylindrical inner peripheral surface 414 mainly functions as a rectifying portion. In the state shown in fig. 10, a minimum throttle portion a14 is formed between the tip end portion of the second tapered portion 524 and the annular portion 415, and a passage portion having a larger distance between the sub-valve port 41b and the needle portion 52 than the minimum throttle portion a14 is formed above the minimum throttle portion a 14. Of such passing portions, for example, the passing portion a15 between the first tapered portion 522 and the cylindrical inner peripheral surface 414 mainly functions as a rectifying portion. In the state shown in fig. 11, a minimum throttle portion a16 is formed between the distal end portion of the second tapered portion 524 and the tubular inner peripheral surface 414, and a passage portion (a passage portion a17 between the second tapered portion 524 and the tubular inner peripheral surface 414) in which the distance between the sub-valve port 41b and the needle portion 52 is larger than the minimum throttle portion a16 is formed at an upper side thereof, the passage portion a17 functioning as a rectifying portion.
Further, as the above-described embodiment, the first modification, and the second modification, a combination of shapes of the sub valve port and the sub valve body is exemplified, but these shapes may be appropriately combined, and are not limited to the above-described examples. For example, the secondary valve port may have both a tapered portion and a stepped portion, or the secondary valve port may have an opening end portion and a small diameter portion, and a flow straightening portion having a larger volume than the minimum throttle portion may be formed upstream of the minimum throttle portion.
In the above embodiment, the sub valve body 5 is not in contact with the partition wall 41 at the lowermost position, and fluid can pass through the sub valve port 41a, but as shown in the specific examples of fig. 12 to 14, the sub valve body may be in contact with the partition wall to prevent fluid from passing therethrough. Fig. 12 corresponds to the shape of the above embodiment, and the first tapered portion 522 is in contact with the boundary portion between the tapered portion 412 and the cylindrical inner peripheral surface 413. Fig. 13 corresponds to the first modification described above, and the vicinity of the first straight portion 521 in the first tapered portion 522 is in contact with the upper end portion 412A. Fig. 14 corresponds to the second modification described above, and the first tapered portion 522 abuts against the upper end portion of the annular portion 415. The combination of the positions at which the sub valve element and the sub valve port are in contact with each other is not limited to the above combination.
In the above embodiment, the tubular inner peripheral surface 413 serving as the small diameter portion is located closer to the main valve port 23a than the Z-direction central portion of the partition wall portion 41, but the position of the small diameter portion is not limited thereto. For example, when the Z-direction dimension of the partition wall portion is sufficiently large and the volume of the rectifying portion is easily secured, the small diameter portion may be located on the opposite side of the main valve port from the Z-direction center portion of the partition wall portion.
In the above embodiment, the tubular inner peripheral surface 413 serving as the small diameter portion is the portion of the sub-valve port 41a having the smallest inner diameter and is located at the position closest to the main valve port 23a in the partition wall portion 41, but may be formed in a shape (constricted shape) in which the inner diameter increases again as the small diameter portion moves toward the main valve port side, for example.
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 (4)
1. An electrically operated valve includes: a valve housing; a main valve body that changes the opening of a main valve opening provided in a main valve chamber of the valve housing; a sub valve body that changes an opening degree of a sub valve port provided in a sub valve chamber of the main valve body; and a driving part for driving the sub-valve core to advance and retreat in the axial direction,
the above-mentioned electric valve is characterized in that,
the valve housing has a first port opening in a direction intersecting the axial direction and a second port communicating with the main valve port and opening in the axial direction,
the main valve body has a partition wall portion extending in a direction intersecting the axial direction and the sub valve body is moved toward or away from the partition wall portion, and a cylindrical portion extending from the partition wall portion toward a side opposite to the main valve opening and forming the sub valve chamber from the partition wall portion and the cylindrical portion,
at least one communication hole for communicating the inside and the outside of the cylindrical portion is formed in the cylindrical portion,
the sub valve port has an opening end portion which is a through hole formed in the partition wall portion and is an end portion on the opposite side of the main valve port, and a small diameter portion which is located on the main valve port side from the opening end portion and is formed to have a smaller diameter than the opening end portion,
in the state where the sub valve element is located most on the main valve port side, a position where the sub valve element is separated from the partition wall portion and where the distance between the sub valve element and the sub valve port is smallest is formed on the partition wall portion on the main valve port side of the axial center portion in the axial direction, and the distance between the sub valve element and the sub valve port at the opening end portion is larger than the distance between the sub valve element and the sub valve port at the smallest position.
2. The electrically operated valve as set forth in claim 1, wherein,
the secondary valve port has a tapered portion having an inner diameter that decreases toward the primary valve port side between the opening end portion and the small diameter portion.
3. An electrically operated valve as claimed in claim 1 or 2, characterized in that,
the secondary valve port has a stepped portion between the opening end portion and the small diameter portion, the stepped portion being formed of a cylindrical inner peripheral surface extending in the axial direction and an annular portion extending radially inward from the end portion of the cylindrical inner peripheral surface on the main valve port side.
4. A refrigeration cycle system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, an electronic expansion valve arranged between the indoor heat exchanger and the outdoor heat exchanger, and a dehumidifying valve arranged on the indoor heat exchanger, and is characterized in that,
use of the electrically operated valve according to any one of claims 1 to 3 as the dehumidification valve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020115133A JP7409982B2 (en) | 2020-07-02 | 2020-07-02 | Electric valve and refrigeration cycle system |
| JP2020-115133 | 2020-07-02 |
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| Publication Number | Publication Date |
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| CN113883284A CN113883284A (en) | 2022-01-04 |
| CN113883284B true CN113883284B (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110686206.4A Active CN113883284B (en) | 2020-07-02 | 2021-06-21 | Electric valve and refrigeration cycle system |
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| JP (1) | JP7409982B2 (en) |
| CN (1) | CN113883284B (en) |
Families Citing this family (2)
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|---|---|---|---|---|
| CN114352751A (en) * | 2022-01-20 | 2022-04-15 | 广东威灵电机制造有限公司 | Electronic expansion valve, refrigeration equipment and automobile |
| GB2617337A (en) * | 2022-04-04 | 2023-10-11 | Weir Minerals Netherlands Bv | Valve |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113883284A (en) | 2022-01-04 |
| JP7409982B2 (en) | 2024-01-09 |
| JP2022012948A (en) | 2022-01-18 |
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