CN108343776B - Electric valve and refrigeration cycle system - Google Patents
Electric valve and refrigeration cycle system Download PDFInfo
- Publication number
- CN108343776B CN108343776B CN201810000796.9A CN201810000796A CN108343776B CN 108343776 B CN108343776 B CN 108343776B CN 201810000796 A CN201810000796 A CN 201810000796A CN 108343776 B CN108343776 B CN 108343776B
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- Prior art keywords
- rotor
- valve
- screw member
- female screw
- electrically operated
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 10
- 239000011347 resin Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 19
- 239000000872 buffer Substances 0.000 claims description 10
- 230000003139 buffering effect Effects 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000004734 Polyphenylene sulfide Substances 0.000 description 8
- 239000000654 additive Substances 0.000 description 8
- 230000000996 additive effect Effects 0.000 description 8
- 229920000069 polyphenylene sulfide Polymers 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- -1 Polytetrafluoroethylene Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
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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
- F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
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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
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)
- Mechanically-Actuated Valves (AREA)
Abstract
The invention provides an electric valve capable of keeping high working performance and durability and restraining working sound and contact sound and a refrigeration circulation system using the electric valve. An electrically operated valve converts a rotary motion of a rotor accommodated in an inner periphery of a housing into a linear motion by screw engagement of a male screw member and a female screw member, and moves a valve body accommodated in a valve body in an axial direction based on the linear motion, the electrically operated valve comprising: a rotation driving unit including the rotor, the male screw member, and the valve element and driven in accordance with rotation of the rotor; a fixed driving portion including the female screw member and not driven with rotation of the rotor; and a contact portion disposed on one of the rotation driving portion and the fixed driving portion and contacting the rotation driving portion or the fixed driving portion.
Description
Technical Field
The present invention relates to an electric valve and a refrigeration cycle system using the electric valve.
Background
Currently, an electrically operated valve used in a combination air conditioner, an indoor air conditioner, a refrigerator, and the like is known (for example, see patent document 1). In the motor-operated valve 100, as shown in fig. 6, when the rotor 103 is rotated by driving the stepping motor, the valve body 114 is moved in the direction of the center axis L by the thread feeding action of the female thread 131a and the male thread 121 a. This adjusts the opening/closing valve port 121, and controls the flow rate of the refrigerant flowing into the pipe joint 111 and flowing out of the pipe joint 112.
Documents of the prior art
Patent document 1: japanese patent 2015-45411
However, in the motor-operated valve 100 described above, the dimensions of the threads such as the top diameter, the bottom diameter, and the effective diameter of the male thread 121a and the female thread 131a may change due to a change in the temperature of the use environment. Therefore, in order to ensure the operability of the motor-operated valve 100, it is necessary to provide a gap 150 (an inter-thread gap) between the male thread 121a and the female thread 131a as shown in fig. 7 in consideration of dimensional changes.
However, if the inter-thread gap 150 is increased, the valve shaft 141 (female screw member) moves in the vertical and horizontal directions when the electric valve 100 is operated, and there is a problem that an operation sound (hereinafter, referred to as an operation sound) is easily generated by vibration during operation.
As a solution to the problem of the operational noise being likely to occur, a method of applying an axial load to the valve shaft 141 by a spring or the like to suppress vibration is considered. However, in this case, when the electric valve 100 is operated, an axial load is applied to the screw, or a load is generated by a pressure difference of the fluid passing through the gap formed between the valve body 114 and the valve port 121, which may deteriorate the durability of the electric valve 100.
In the motor-operated valve 100 described above, the narrower the interval between the stator of the coil and the rotor 103, the greater the torque for rotating the rotor 103, and the narrower the interval between the stator of the coil and the rotor 103 is desired. However, when the rotation axis of the rotor 103 is misaligned due to the influence of a gap between the threads or the like, there is a problem that the inner periphery of the housing 160 comes into contact with the rotor 103 and a contact sound is generated.
Disclosure of Invention
The invention aims to provide an electric valve capable of keeping high operability and durability and restraining operation sound and contact sound, and a refrigeration cycle using the electric valve.
An electrically operated valve according to the present invention is an electrically operated valve in which a rotary motion of a rotor accommodated in an inner periphery of a housing is converted into a linear motion by a screw engagement between a male screw member and a female screw member, and a valve body accommodated in a valve body is moved in an axial direction based on the linear motion, the electrically operated valve including:
a rotation driving unit including the rotor, the male screw member, and the valve body, and driven in accordance with rotation of the rotor;
a fixed driving unit including the female screw member and not driven with rotation of the rotor; and
and a contact portion disposed on one of the rotation driving portion and the fixed driving portion and contacting the rotation driving portion or the fixed driving portion.
In this way, by interposing the contact portion between the rotary drive portion and the fixed drive portion, the vibration generated by the gap between the male screw and the female screw is absorbed, and thus it is possible to prevent the male screw member from moving in the vertical and horizontal directions to generate an operating sound when the rotor rotates, and also to prevent the inner periphery of the housing from contacting the rotor to generate a contact sound when the rotor rotates. Further, axial pressure is not applied between the male screw and the female screw, and the durability of the motor-operated valve is not impaired. Therefore, it is possible to provide an electrically operated valve capable of suppressing operating noise and contact noise while maintaining high operability and durability.
In addition, the electrically operated valve of the present invention is characterized in that,
the contact portion is a sliding member that is disposed on an inner periphery of the rotor and contacts an outer periphery of the female screw member when the rotor rotates.
In this case, when the rotor rotates, the sliding member slides on the outer periphery of the female screw member, so that the rotation shaft of the rotor does not become misaligned, and the contact sound generated by the contact between the inner periphery of the housing and the rotor can be prevented.
In addition, the electrically operated valve of the present invention is characterized in that,
the contact portion is a sliding member that is disposed on an outer periphery of the female screw member and contacts an inner periphery of the rotor when the rotor rotates.
In this case, when the rotor rotates, the sliding member slides on the inner periphery of the rotor, so that the rotation shaft of the rotor does not deviate from the center, and the contact sound generated by the contact between the inner periphery of the housing and the rotor can be prevented.
In addition, the electrically operated valve of the present invention is characterized in that,
the male screw member is provided with a buffer portion for buffering the female screw member,
the contact portion is a sliding portion provided on an outer periphery of the buffer portion and contacting an inner periphery of the female screw member when the rotor rotates.
As described above, by providing the sliding portion on the outer periphery of the buffer portion and sliding the sliding portion on the inner periphery of the female screw member when the rotor rotates, the play of the male screw member (rotation driving portion) can be suppressed, and the occurrence of operating noise due to the movement of the male screw member in the vertical and horizontal directions and the occurrence of contact noise due to the contact between the inner periphery of the housing and the rotor can be prevented.
In addition, the electrically operated valve of the present invention is characterized in that,
the contact portion is an elastic member that is disposed on an inner periphery of the rotor and contacts an outer periphery of the female screw member when the rotor rotates.
In this way, by disposing the elastic member on the inner periphery of the rotor, vibration generated when the rotor rotates due to the gap between the male screw and the female screw is absorbed by the elastic force of the elastic member, and it is possible to prevent the occurrence of operating noise when the male screw member moves in the vertical and horizontal directions and the occurrence of contact noise when the inner periphery of the housing contacts the rotor.
In addition, the electrically operated valve of the present invention is characterized in that,
the rotation driving part includes a cylindrical valve guide for transmitting the linear motion of the male screw member to the valve body,
the contact portion is an elastic member disposed on an outer periphery of the female screw member and contacting an outer periphery of the valve guide when the rotor rotates.
In this way, by disposing the elastic member below the valve shaft holder, vibration generated when the rotor rotates due to a gap between the male screw and the female screw is absorbed by the elastic force of the elastic member, and it is possible to prevent the male screw member from moving in the vertical and horizontal directions to generate operating noise and prevent the inner periphery of the housing from contacting the rotor to generate contact noise.
In addition, the electrically operated valve of the present invention is characterized in that,
the female screw member is formed of resin.
This can improve the durability of the screw.
The refrigeration cycle of the present invention is a refrigeration cycle including a compressor, a condenser, an expansion valve, an evaporator, and the like, and is characterized in that the electric valve is used as the expansion valve.
The effects of the invention are as follows.
According to the present invention, it is possible to provide an electric valve capable of suppressing operating sound and contact sound while maintaining high operability and durability, and a refrigeration cycle using the electric valve.
Drawings
Fig. 1 is a sectional view of an electrically operated valve of the first embodiment.
Fig. 2 is a cross-sectional view illustrating a slide member attached to the motor-operated valve of the first embodiment.
Fig. 3 is a sectional view of the electrically operated valve of the second embodiment.
Fig. 4 is a sectional view of the motor-operated valve of the third embodiment.
Fig. 5 is a sectional view of an electrically operated valve of the fourth embodiment.
Fig. 6 is a sectional view of a conventional motor-operated valve.
Fig. 7 is a cross-sectional view showing a gap between threads of a conventional motor-operated valve.
In the figure:
2. 102, 104, 106-electric valve, 4-rotor, 6-valve shaft holder, 6 c-fitting portion, 6 d-internal thread, 16 a-valve port, 17-valve core, 18-valve guide, 22-gap, 33-bushing member, 41-valve shaft, 41 a-external thread, 41 b-flange portion, 41 j-buffer portion, 60-housing, 91-sliding member (contact portion), 93-sliding portion (contact portion), 95-elastic member (contact portion), 95 a-spring portion, 97-elastic member (contact portion), 97 a-spring portion, X-rotary drive portion, Y-stationary drive portion.
Detailed Description
Hereinafter, the motor-operated valve according to the first embodiment will be described with reference to the drawings. Fig. 1 is a sectional view showing an electric valve 2 of the first embodiment. In the present specification, "upper" or "lower" is defined in the state of fig. 1. That is, the rotor 4 is located above the valve body 17.
In the motor-operated valve 2, a valve main body 30 is integrally connected to a lower portion of an opening side of a cylindrical cup-shaped housing 60 formed of a non-magnetic metal by welding or the like.
Here, the valve main body 30 is made of metal such as stainless steel, and has the valve chamber 11 therein. A first pipe joint 12 made of stainless steel or copper and directly communicating with the valve chamber 11 is fixedly attached to the valve main body 30. Further, a valve seat member 16 is assembled inside the lower portion of the valve main body 30, and a valve port 16a having a circular cross section is formed in the valve seat member 16. A second pipe joint 15 made of stainless steel or copper and communicating with the valve chamber 11 through a valve port 16a is fixed to the valve seat member 16.
A rotatable rotor 4 is housed in the inner periphery of the housing 60, and a valve shaft 41 is disposed in the axial core portion of the rotor 4 via a bush member 33. The rotor 4 is formed of a resin material such as polyphenylene sulfide (PPS) containing magnetic powder, or a material having magnetism such as a ferrite magnet. The hub member 33 and the valve shaft 41 are each formed of a metal such as stainless steel, and the valve shaft 41 and the rotor 4 coupled by the hub member 33 integrally move in the vertical direction while rotating.
In the motor-operated valve 2 of the present embodiment, a portion hatched with an upward right diagonal line including the rotor 4, the bush member 33, the valve shaft 41, the valve body 17, the valve guide 18 described later, and the like constitutes a rotation driving portion X that is driven in accordance with the rotation of the rotor 4. A male screw 41a is formed on the outer peripheral surface of the valve shaft 41 near the intermediate portion. In the present embodiment, the valve shaft 41 functions as a male screw member.
A stator, not shown, including a yoke, a bobbin, and a coil is disposed on the outer periphery of the housing 60, and the rotor 4 and the stator constitute a stepping motor.
The valve shaft holder 6 is fixed to the valve shaft 41 below the bush member 33 so as not to be rotatable relative to the valve body 30, and the valve shaft holder 6 is screwed to the valve shaft 41 as described below, and has a function of suppressing inclination of the valve shaft 41.
The valve shaft holder 6 is a member constituting a fixed driving portion Y that is not driven with the rotation of the rotor 4. The valve shaft holder 6 is made of a resin material such as polyphenylene sulfide (PPS), and contains an additive for reducing the friction coefficient. As the additive, fluorine resin such as Polytetrafluoroethylene (PTFE), carbon fiber, or the like is used.
The valve shaft holder 6 includes a first cylindrical portion 6a on the upper side, a second cylindrical portion 6b on the lower side, a fitting portion 6c housed on the inner peripheral side of the valve main body 30, and an annular flange portion 6 f. The flange portion 6f of the valve shaft holder 6 is fixed to the upper end of the valve main body 30 by welding or the like. A housing chamber 6h for housing a valve guide 18 described later is formed inside the valve shaft holder 6.
The first cylindrical portion 6a of the valve shaft holder 6 has a female screw 6d formed downward from the upper opening 6g to a predetermined depth. Therefore, in the present embodiment, the valve shaft holder 6 functions as a female screw member. The threaded connection a is formed by a male screw 41a formed on the outer periphery of the valve shaft 41 and a female screw 6d formed on the inner periphery of the first cylindrical portion 6a of the valve shaft holder 6.
Further, a pressure equalizing hole 51 is formed through a side surface of the second cylindrical portion 6b of the valve holder 6, and the valve holder chamber 83 in the second cylindrical portion 6b and the rotor housing chamber 67 (second back pressure chamber) are communicated by the pressure equalizing hole 51. By providing the pressure equalizing hole 51 in this manner, the space of the housing 60 that houses the rotor 4 and the space inside the valve shaft holder 6 communicate with each other, and the movement operation of the valve shaft holder 6 can be performed smoothly.
A cylindrical valve guide 18 is disposed below the valve shaft 41 so as to be slidable with respect to the housing chamber 6h of the valve shaft holder 6. The ceiling portion 21 side of the valve guide 18 is bent substantially at a right angle by press forming. The ceiling portion 21 is formed with a through hole 18 a. Further, a collar 41b is formed below the valve shaft 41.
Here, the valve shaft 41 is inserted into the through hole 18a of the valve guide 18 in a loosely fitted state so as to be rotatable and displaceable in the radial direction with respect to the valve guide 18, and the collar portion 41b is disposed in the valve guide 18 so as to be rotatable and displaceable in the radial direction with respect to the valve guide 18. The valve shaft 41 is inserted through the through hole 18a, and the upper surface of the collar portion 41b is disposed to face the ceiling portion 21 of the valve guide 18. The diameter of the collar portion 41b is larger than the diameter of the through hole 18a of the valve guide 18, and the valve shaft 41 is thereby prevented from coming off.
The valve shaft 41 and the valve guide 18 are movable in the radial direction relative to each other, and therefore, with respect to the arrangement positions of the valve shaft holder 6 and the valve shaft 41, concentricity with the valve guide 18 and the valve body 17 can be obtained without requiring high concentric mounting accuracy.
A washer 70 having a through hole formed in the central portion thereof is provided between the ceiling portion 21 of the valve guide 18 and the flange portion 41b of the valve shaft 41. The gasket 70 is preferably a high-slip surface metal gasket, a high-slip resin gasket such as a fluororesin or a high-slip resin-coated metal gasket, various high-slip resin-containing resin gaskets, or the like.
Further, a compressed valve spring 27 and a spring seat 35 are accommodated in the valve guide 18.
Next, a main part of the motor-operated valve 2 in the first embodiment will be described. As shown in fig. 1, a sliding member 91 (contact portion) is attached to a lower portion of the inner periphery of the rotor 4 constituting a part of the rotation driving portion X. The slide member 91 contacts the outer periphery of the second cylindrical portion 6b of the valve shaft holder 6 (female screw member) constituting the fixed driving portion Y when the rotor 4 rotates. The slide member 91 is made of a resin material such as polyphenylene sulfide (PPS) and contains an additive for reducing the friction coefficient, similarly to the valve shaft holder 6. As the additive, fluorine resin such as Polytetrafluoroethylene (PTFE), carbon fiber, or the like is used. The surface on the side contacting the valve shaft holder 6 is configured to have low friction.
The slide member 91 may be an annular member that rotates once around the inner circumference of the rotor 4 as shown in fig. 2 (a), but may be formed of a plurality of members. For example, as shown in fig. 2 (b), a pair of arc-shaped sliding members 91 may be attached to the inner periphery of the rotor 4. As shown in fig. 2 (c), a plurality of sliding members 91 may be provided on the inner periphery of the rotor 4.
According to the motor-operated valve 2 of the first embodiment, the sliding member 91 absorbs the vibration of the rotor 4 during rotation due to the gap between the male screw 41a and the female screw 6d, and the valve shaft 41 can be prevented from moving in the vertical and horizontal directions and generating operating noise.
Further, when the rotor 4 rotates, the sliding member 91 slides on the outer periphery of the valve shaft holder 6, so that the rotation shaft of the rotor 4 does not become misaligned, and the inner periphery of the housing 60 can be prevented from contacting the rotor 4 and generating contact noise. Further, since no axial pressure is applied between the external thread 41a and the internal thread 6d, the durability of the motor-operated valve 2 is not impaired.
Therefore, the motor-operated valve 2 capable of suppressing the operating sound and the contact sound while maintaining high operability and durability can be provided.
In the motor-operated valve 2 according to the first embodiment, the slide member 91 may be attached to the outer periphery of the second cylindrical portion 6b of the valve shaft holder 6 (female screw member). In this case, when the rotor 4 rotates, the sliding member 91 slides on the inner periphery of the rotor 4, and the same effect as that in the case where the sliding member 91 is attached to the rotor 4 can be obtained.
Next, description of the motor-operated valve according to the second embodiment will be omitted as appropriate, overlapping with the description of the first embodiment. In the description of the second embodiment, the same reference numerals as those used in the description of the first embodiment are used for the same configuration as that of the motor-operated valve 2 of the first embodiment.
Fig. 3 is a diagram showing the electric valve 102 of the second embodiment. As shown in fig. 3, a buffer portion 41j is provided between the male screw 41a and the collar portion 41b of the valve shaft 41, and the buffer portion 41j has a larger diameter than the portion where the male screw 41a is formed and buffers the valve shaft holder 6 (female screw member). The damper 41j is formed of a metal such as stainless steel similarly to the valve shaft 41, and a sliding portion 93 (contact portion) that contacts the second cylindrical portion 6b of the valve shaft holder 6 (female screw member) when the rotor 4 rotates is provided on the outer periphery of the damper 41 j. Further, the surface treatment may be performed so that the outer peripheral surface of the sliding portion 93 has low friction.
According to the motor-operated valve 2 of the second embodiment, the sliding portion 93 is provided on the outer periphery of the buffer portion 41j provided on the valve shaft 41, and the sliding portion 93 is slid on the inner peripheral surface of the valve shaft holder 6 constituting the fixed drive portion Y when the rotor 4 rotates, so that the rotational drive portion X can be suppressed from rattling, and the valve shaft 41 can be suppressed from moving in the vertical and horizontal directions to generate operating noise, or from contact between the inner periphery of the housing 60 and the rotor 4 to generate contact noise.
Further, since the sliding portion 93 can slide on the inner peripheral surface of the valve shaft holder 6 made of the resin material having the reduced friction coefficient as described above, the operability of the electric valve 102 is not deteriorated.
Next, description of the motor-operated valve according to the third embodiment will be omitted as appropriate for the description of the overlapping portions with the first embodiment. In the description of the third embodiment, the same reference numerals as those used in the description of the first embodiment are used for the same structure as that of the motor-operated valve 2 of the first embodiment.
Fig. 4 is a diagram showing the motor-operated valve 104 of the third embodiment. As shown in fig. 4, an elastic member 95 (contact portion) having a substantially U-shape in cross section is attached to a lower portion of the inner periphery of the rotor 4 constituting a part of the rotation driving portion X, and the elastic member 95 extends downward along the inner periphery of the rotor 4, is bent toward the valve shaft holder 6, and stands upward.
The elastic member 95 is formed of a metal such as stainless steel, for example, and a spring portion 95a elastically stretchable in the radial direction of the rotor 4 is in contact with the second cylindrical portion 6b of the valve shaft holder 6 (female screw member) constituting the fixed driving portion Y when the rotor 4 rotates.
In the electric valve 104, the load applied to the valve shaft holder 6 by the elastic member 95 is configured to be smaller than the load generated by the pressure difference of the fluid passing through the gap 22 formed between the valve body 17 and the valve port 16 a.
According to the motor-operated valve 104 in the third embodiment, the elastic member 95 is disposed on the inner periphery of the rotor 4, and vibration generated when the rotor 4 rotates due to the gap between the male screw 41a and the female screw 6d is absorbed by the elastic force of the elastic member 95, so that it is possible to prevent the occurrence of operating noise caused by the vertical movement of the valve shaft 41 or the occurrence of contact noise caused by the contact between the inner periphery of the housing 60 and the rotor 4.
Next, description of the motor-operated valve according to the fourth embodiment will be omitted as appropriate, overlapping with the description of the third embodiment. In the description of the fourth embodiment, the same reference numerals as those used in the description of the third embodiment are used for the same structure as that of the motor-operated valve 2 of the third embodiment.
Fig. 5 is a diagram showing the electric valve 106 of the fourth embodiment. As shown in fig. 5, an elastic member 97 (contact portion) having a substantially L-shape in cross section is attached to the outer periphery of the fitting portion 6c of the valve shaft holder 6 constituting the fixed driving portion Y, and the elastic member 97 extends downward along the outer periphery of the fitting portion 6c, bends toward the spring seat 35, and rises upward.
The elastic member 97 is made of metal such as stainless steel, for example, and a spring portion 97a that can expand and contract in the radial direction of the motor-operated valve 106 due to its elasticity contacts the valve guide 18 that constitutes a part of the rotation driving portion X when the rotor 4 rotates.
In the electrically-operated valve 106, the load applied to the valve shaft holder 6 by the elastic member 97 is configured to be smaller than the load generated by the pressure difference of the fluid passing through the gap 22 formed between the valve body 17 and the valve port 16 a.
According to the motor-operated valve 106 in the fourth embodiment, the elastic member 97 is disposed below the valve shaft holder 6, and vibration generated when the rotor 4 rotates due to the gap between the male screw 41a and the female screw 6d is absorbed by the elastic force of the elastic member 97, so that it is possible to prevent the occurrence of operating noise caused by the vertical movement of the valve shaft 41 or the occurrence of contact noise caused by the contact between the inner periphery of the housing 60 and the rotor 4.
In the first embodiment described above, the case where the slide member 91 is attached to the inner periphery of the rotor 4 has been described as an example, but the slide member 91 may be formed integrally with the rotor 4 at the lower portion of the inner periphery of the rotor 4. Similarly, the slide member 91 may be integrally formed with the valve shaft holder 2 below the outer periphery of the valve shaft holder 2.
Further, in the first embodiment described above, the case where the sliding member 91 is formed of a resin material to which an additive having a low friction coefficient is added was described as an example, but the sliding member may be surface-treated so that the friction coefficient becomes low without containing such an additive. In this case, the material of the sliding member 91 is not limited to a resin material, and a metal may be used.
Further, in the second embodiment described above, the case where the sliding portion 93 formed of a metal is subjected to surface treatment so that the friction coefficient becomes low was described as an example, but the friction coefficient may not be reduced by the surface treatment. For example, the sliding portion 93 may also be formed of a resin material to which an additive is added so that the friction coefficient of the outer peripheral surface of the sliding portion 93 is low.
In the third and fourth embodiments, the elastic members 95 and 97 may be annular members that rotate around the inner circumference of the rotor 4 as shown in fig. 2 (a), but may be formed of a plurality of members. For example, as shown in fig. 2 (b), a pair of arc-shaped elastic members 95 and 97 may be attached to the inner periphery of the rotor 4. As shown in fig. 2 (c), a plurality of elastic members 95 and 97 may be provided on the inner periphery of the rotor 4.
As described above, the valve shaft holder 6 (female screw member) is made of a resin such as polyphenylene sulfide (PPS) containing an additive so that the friction coefficient is low, and thus the valve shaft holder has a low friction coefficient and excellent durability. On the other hand, in a resin-made part generally molded by injection molding, when dimensional deformation such as sink marks and lifting, and dimensional change unique to resin molding such as linear expansion and swelling, which are caused by injection molding, are taken into consideration, precise molding is often difficult.
Therefore, when the valve shaft holder 6 made of resin is used, a gap generated in the engagement between the male screw 41a and the female screw 6d tends to be large. When the gap is increased, the valve shaft holder 6 moves in the vertical and horizontal directions when the rotor 4 rotates, and operation noise is generated, or contact noise is easily generated when the inner periphery of the housing 60 contacts the rotor 4.
However, as described in the above embodiments, the vibration generated by the gap between the male screw 41a and the female screw 6d is absorbed by interposing the contact portion between the rotary drive portion and the fixed drive portion. Therefore, even when the valve shaft holder 6 made of resin is used, it is possible to reliably prevent the generation of operating noise and contact noise when the rotor 4 rotates.
The motor-operated valve according to each of the above embodiments is used as an expansion valve provided between a condenser and an evaporator in a refrigeration cycle including, for example, a compressor, the condenser, the expansion valve, the evaporator, and the like.
Claims (8)
1. An electrically operated valve in which a rotary motion of a rotor housed in an inner periphery of a housing is converted into a linear motion by a screw engagement between a male screw member and a female screw member, and a valve body housed in a valve body is moved in an axial direction based on the linear motion,
the electrically operated valve is characterized by comprising:
a rotation driving unit including the rotor, the male screw member, and the valve body, and driven in accordance with rotation of the rotor;
a fixed driving unit including the female screw member and not driven with rotation of the rotor; and
and a contact portion that is disposed on one of the rotation driving portion and the fixed driving portion, and that contacts the other of the rotation driving portion and the fixed driving portion over an entire range of movement of the valve body in the axial direction.
2. Electrically operated valve according to claim 1,
the contact portion is a sliding member that is disposed on an inner periphery of the rotor and contacts an outer periphery of the female screw member when the rotor rotates.
3. Electrically operated valve according to claim 1,
the contact portion is a sliding member that is disposed on an outer periphery of the female screw member and contacts an inner periphery of the rotor when the rotor rotates.
4. Electrically operated valve according to claim 1,
the male screw member is provided with a buffer portion for buffering the female screw member,
the contact portion is a sliding portion provided on an outer periphery of the buffer portion and contacting an inner periphery of the female screw member when the rotor rotates.
5. Electrically operated valve according to claim 1,
the contact portion is an elastic member that is disposed on an inner periphery of the rotor and contacts an outer periphery of the female screw member when the rotor rotates.
6. Electrically operated valve according to claim 1,
the rotation driving part includes a cylindrical valve guide for transmitting the linear motion of the male screw member to the valve body,
the contact portion is an elastic member disposed on an outer periphery of the female screw member and contacting an outer periphery of the valve guide when the rotor rotates.
7. An electrically operated valve according to any one of claims 1 to 5,
the female screw member is formed of resin.
8. A refrigeration cycle system comprises a compressor, a condenser, an expansion valve and an evaporator,
an electrically operated valve as claimed in any one of claims 1 to 7 is used as the expansion valve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-011529 | 2017-01-25 | ||
| JP2017011529A JP6832172B2 (en) | 2017-01-25 | 2017-01-25 | Electric valve and refrigeration cycle system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108343776A CN108343776A (en) | 2018-07-31 |
| CN108343776B true CN108343776B (en) | 2020-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810000796.9A Active CN108343776B (en) | 2017-01-25 | 2018-01-02 | Electric valve and refrigeration cycle system |
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| Country | Link |
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| JP (1) | JP6832172B2 (en) |
| CN (1) | CN108343776B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7098557B2 (en) * | 2019-03-05 | 2022-07-11 | 株式会社鷺宮製作所 | Solenoid valve and refrigeration cycle system including it |
| US11959561B2 (en) * | 2019-03-13 | 2024-04-16 | Zhejiang Dunan Artificial Environment Co., Ltd. | Electronic expansion valve and refrigeration system |
| JP7359711B2 (en) * | 2020-02-06 | 2023-10-11 | 株式会社鷺宮製作所 | Electric valve and refrigeration cycle system |
| JP6823222B1 (en) * | 2020-08-18 | 2021-01-27 | 太平洋工業株式会社 | Solenoid valve |
| JP7349420B2 (en) * | 2020-11-27 | 2023-09-22 | 株式会社鷺宮製作所 | Electric valve and refrigeration cycle system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788073A (en) * | 2009-01-22 | 2010-07-28 | 株式会社不二工机 | Mortor operated valve |
| JP2011027148A (en) * | 2009-07-23 | 2011-02-10 | Fuji Koki Corp | Electric valve |
| CN102213509A (en) * | 2011-06-02 | 2011-10-12 | 上海俊乐制冷自控元件有限公司 | Electronic expansion valve |
| CN202158703U (en) * | 2011-06-02 | 2012-03-07 | 上海俊乐制冷自控元件有限公司 | Straight-through electronic expansion valve |
| CN204692724U (en) * | 2015-05-05 | 2015-10-07 | 苏州科迪流体控制设备有限公司 | Mortor operated valve transmission connecting structure |
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|---|---|---|---|---|
| JP4015769B2 (en) * | 1998-12-18 | 2007-11-28 | シャープ株式会社 | Fluid control valve |
| JP4684305B2 (en) * | 2001-09-03 | 2011-05-18 | 株式会社鷺宮製作所 | Motorized valve |
| JP4762018B2 (en) * | 2006-03-23 | 2011-08-31 | 株式会社不二工機 | Motorized valve |
| JP5291477B2 (en) * | 2009-01-22 | 2013-09-18 | 株式会社不二工機 | Motorized valve |
| JP5701825B2 (en) * | 2012-08-08 | 2015-04-15 | 株式会社鷺宮製作所 | Flow control valve |
| JP6214487B2 (en) * | 2014-07-18 | 2017-10-18 | 株式会社鷺宮製作所 | Motorized valve |
| JP6392685B2 (en) * | 2015-03-06 | 2018-09-19 | 株式会社鷺宮製作所 | Motorized valve |
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2017
- 2017-01-25 JP JP2017011529A patent/JP6832172B2/en active Active
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2018
- 2018-01-02 CN CN201810000796.9A patent/CN108343776B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788073A (en) * | 2009-01-22 | 2010-07-28 | 株式会社不二工机 | Mortor operated valve |
| JP2011027148A (en) * | 2009-07-23 | 2011-02-10 | Fuji Koki Corp | Electric valve |
| CN102213509A (en) * | 2011-06-02 | 2011-10-12 | 上海俊乐制冷自控元件有限公司 | Electronic expansion valve |
| CN202158703U (en) * | 2011-06-02 | 2012-03-07 | 上海俊乐制冷自控元件有限公司 | Straight-through electronic expansion valve |
| CN204692724U (en) * | 2015-05-05 | 2015-10-07 | 苏州科迪流体控制设备有限公司 | Mortor operated valve transmission connecting structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018119613A (en) | 2018-08-02 |
| JP6832172B2 (en) | 2021-02-24 |
| CN108343776A (en) | 2018-07-31 |
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