JP6832172B2 - Electric valve and refrigeration cycle system - Google Patents

Description

The present invention relates to an electric valve and a refrigeration cycle system using the electric valve.

Conventionally, electric valves used in packaged air conditioners, room air conditioners, refrigerators and the like are known (see, for example, Patent Document 1). In the electric valve 100, as shown in FIG. 6, when the stepping motor is driven to rotate the rotor 103, the valve body 114 moves in the central axis L direction due to the screw feeding action of the female screw 131a and the male screw 121a. .. As a result, the valve port 121 is adjusted to open and close, and the flow rate of the refrigerant flowing in from the pipe joint 111 and flowing out from the pipe joint 112 is controlled.

Japanese Patent No. 2015-45411

By the way, in the above-mentioned electric valve 100, the screw dimensions such as the ridge diameter, the valley diameter, and the effective diameter of the male screw 121a and the female screw 131a may change due to the temperature change in the usage environment. Therefore, in order to ensure the operability of the electric valve 100, it is necessary to provide a clearance 150 (gap between screws) between the male screw 121a and the female screw 131a as shown in FIG. 7 in consideration of the dimensional change. There is.

However, when the gap 150 between the screws is increased, the valve shaft 141 (female screw member) moves in the vertical and horizontal directions when the electric valve 100 is operated, so that an operating noise (hereinafter referred to as an operating noise) due to vibration during operation is generated. There was a problem that it became easier.

As a solution to the problem that this operating noise is likely to be generated, a method of suppressing vibration by applying an axial load to the valve shaft 141 with a spring or the like can be considered. However, in this case, when the electric valve 100 is operated, an axial load and a load due to the pressure difference of the fluid passing through the clearance formed between the valve body 114 and the valve port 121 are applied to the screw, so that the electric valve is applied. There is a risk that the durability of 100 will be impaired.

Further, in the above-mentioned electric valve 100, the torque for rotating the rotor 103 increases as the distance between the coil stator and the rotor 103 becomes narrower, so that the distance between the coil stator and the rotor 103 may be narrower. desirable. However, there is a problem that when the rotating shaft of the rotor 103 is misaligned due to the influence of the gap between the screws, the inner circumference of the case 160 and the rotor 103 come into contact with each other to generate a contact sound.

An object of the present invention is to provide an electric valve capable of suppressing operating noise and contact noise while maintaining high operability and durability, and a refrigeration cycle system using the electric valve.

The electric valve of the present invention
The rotary motion of the rotor housed in the inner circumference of the case is converted into a linear motion by screwing the male screw member and the female screw member, and the valve body housed in the valve body is used as the axis based on this linear motion. An electric valve that moves in the direction
A rotary drive unit that includes the rotor, the male screw member, and the valve body and is driven as the rotor rotates.
A fixed drive unit that includes the female screw member and is not driven by the rotation of the rotor.
A contact portion that is arranged on either one of the rotary drive unit and the fixed drive unit and that contacts the other in the radial direction orthogonal to the axial direction when the rotor rotates is provided.
The rotary drive unit includes a tubular valve guide that transmits the linear motion of the male screw member to the valve body.
The contact portion is a sliding member or an elastic member, and is
The rotor is Rukoto coupled with the male threaded member via a bush member, the male screw member and the rotor is moved integrally in a vertical direction while rotating,
The valve body is integrally connected below the opening side of the case.

By interposing the contact portion between the rotary drive unit and the fixed drive unit in this way, the vibration caused by the gap between the male screw and the female screw is absorbed, so that the male screw member can be moved when the rotor rotates. It is possible to prevent the operation noise from being generated by moving in the vertical and horizontal directions, and it is also possible to prevent the inner circumference of the case and the rotor from coming into contact with each other when the rotor is rotating to generate a contact noise. Further, since no axial pressure is applied between the male screw and the female screw, the durability of the electric valve is not impaired. Therefore, it is possible to provide an electric valve capable of suppressing operating noise and contact noise while maintaining high operability and durability.

Further, the electric valve of the present invention is
The contact portion is arranged on the inner circumference of the rotor.
It is a sliding member that comes into contact with the outer circumference of the female screw member when the rotor rotates.

In this case, since the sliding member slides on the outer circumference of the female screw member when the rotor is rotated, the rotation axis of the rotor is not misaligned, so that the inner circumference of the case and the rotor come into contact with each other and make a contact noise. Can be prevented from occurring.

Further, the electric valve of the present invention is
A stator arranged on the outer periphery of the case rotates a rotor housed in the inner circumference of the case , and this rotational motion is converted into a linear motion by screwing a male screw member and a female screw member, and this linear motion is performed. It is an electric valve that moves the valve body housed in the valve body in the axial direction based on the above.
A rotary drive unit that includes the rotor, the male screw member, and the valve body and is driven as the rotor rotates.
A fixed drive unit including the female screw member and not driven by the rotation of the rotor is provided.
The rotary drive unit includes a tubular valve guide that transmits the linear motion of the male screw member to the valve body.
The male screw member is provided with a buffer portion that cushions the female screw member, and the outer periphery of the buffer portion has a sliding portion that comes into contact with the inner circumference of the female screw member when the rotor is rotated.
The rotor is coupled to the male screw member via a bush member, so that the male screw member and the rotor move integrally in the vertical direction while rotating.
The valve body is integrally connected below the opening side of the case.

In this case, since the sliding member slides on the inner circumference of the rotor when the rotor is rotated, the rotation shaft of the rotor is not misaligned, so that the inner circumference of the case and the rotor come into contact with each other and a contact noise is generated. It can be prevented from occurring.

Further, the electric valve of the present invention is
The male screw member is provided with a buffer portion that buffers the female screw member.
The contact portion is provided on the outer periphery of the buffer portion, and is a sliding portion that comes into contact with the inner circumference of the female screw member when the rotor rotates.

In this way, by providing a sliding portion on the outer circumference of the shock absorber and sliding the sliding portion with the inner circumference of the female screw member when the rotor rotates, it is possible to prevent the male screw member (rotation drive portion) from wobbling. It is possible to prevent the male screw member from moving in the vertical and horizontal directions to generate an operating noise and to prevent the inner circumference of the case from coming into contact with the rotor to generate a contact noise.

Further, the electric valve of the present invention is
The contact portion is arranged on the inner circumference of the rotor.
It is an elastic member that comes into contact with the outer circumference of the female screw member when the rotor rotates.

By arranging the elastic member on the inner circumference of the rotor in this way, the vibration during rotation of the rotor caused by the gap between the male screw and the female screw is absorbed by the elastic force of the elastic member, so that the male screw member Can be prevented from moving up, down, left and right to generate an operating noise, and to prevent the inner circumference of the case from coming into contact with the rotor to generate a contact noise.

The electric valve of the present invention,
Before SL contact portion, the is disposed on the outer periphery of the female screw member, characterized in that it is a resilient member in contact with the outer periphery of the valve guide during rotation of the rotor.

By arranging the elastic member below the valve shaft holder in this way, the vibration during rotation of the rotor caused by the gap between the male screw and the female screw is absorbed by the elastic force of the elastic member. It is possible to prevent the member from moving in the vertical and horizontal directions to generate an operating noise and to prevent the inner circumference of the case from coming into contact with the rotor to generate a contact noise.

Further, the electric valve of the present invention is
The female screw member is made of resin.
As a result, the durability of the screw can be improved.

Further, the refrigeration cycle system of the present invention is
A refrigeration cycle system including a compressor, a condenser, an expansion valve, an evaporator, and the like, characterized in that the above-mentioned electric valve is used as the expansion valve.

According to the invention according to the present invention, it is possible to provide an electric valve capable of suppressing operating noise and contact noise while maintaining high operability and durability, and a refrigeration cycle system using the electric valve.

It is sectional drawing of the electric valve which concerns on 1st Embodiment. It is sectional drawing explaining the sliding member attached to the electric valve which concerns on 1st Embodiment. It is sectional drawing of the electric valve which concerns on 2nd Embodiment. It is sectional drawing of the electric valve which concerns on 3rd Embodiment. It is sectional drawing of the electric valve which concerns on 4th Embodiment. It is sectional drawing of the conventional electric valve. It is sectional drawing which shows the gap between screws of a conventional electric valve.

Hereinafter, the electric valve according to the first embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the electric valve 2 according to the first embodiment. In addition, in this specification, "upper" or "lower" is defined in the state of FIG. That is, the rotor 4 is located above the valve body 17.

In the electric valve 2, the valve body 30 is integrally connected to the lower side of the opening side of the case 60 having a tubular cup shape made of non-magnetic metal by welding or the like.

Here, the valve body 30 is made of a metal such as stainless steel and has a valve chamber 11 inside. Further, a first pipe joint 12 made of stainless steel or copper that directly communicates with the valve chamber 11 is fixedly mounted on the valve body 30. Further, a valve seat member 16 having a valve port 16a having a circular cross section is incorporated in the lower inside of the valve body 30. A second pipe joint 15 made of stainless steel or copper that communicates with the valve chamber 11 via the valve port 16a is fixedly mounted on the valve seat member 16.

A rotatable rotor 4 is housed in the inner circumference of the case 60, and a valve shaft 41 is arranged at a shaft 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 magnetic material such as a ferrite magnet. Both the bush member 33 and the valve shaft 41 are made of a metal such as stainless steel, and the valve shaft 41 and the rotor 4 connected by the bush member 33 move integrally in the vertical direction while rotating.

In the electric valve 2 of the present embodiment, the portion hatched by the upward-sloping diagonal line including the rotor 4, the bush member 33, the valve shaft 41, the valve body 17, and the valve guide 18 described later is accompanied by the rotation of the rotor 4. It constitutes a rotary drive unit X that drives the vehicle. A male screw 41a is formed on the outer peripheral surface of the valve shaft 41 near the middle portion. In this embodiment, the valve shaft 41 functions as a male screw member.

A stator composed of a yoke, a bobbin, a coil, and the like (not shown) is arranged on the outer periphery of the case 60, and the rotor 4 and the stator form a stepping motor.
Below the bush member 33 of the valve shaft 41, a valve shaft holder 6 having a function of forming a screw connection A with the valve shaft 41 and suppressing the inclination of the valve shaft 41 as described later is a valve body 30. It is fixed so that it cannot rotate relatively.

The valve shaft holder 6 is a component that constitutes a fixed drive unit Y that is not driven as the rotor 4 rotates. The valve shaft holder 6 is made of a resin material such as polyphenylene sulfide (PPS), and contains an additive to reduce the coefficient of friction. As the additive, a fluororesin such as polytetrafluoroethylene (PTFE), carbon fiber, or the like is used.

The valve shaft holder 6 includes a first tubular portion 6a on the upper side, a second tubular portion 6b on the lower side, a fitting portion 6c accommodated on the inner peripheral portion side of the valve body 30, and a ring-shaped flange portion 6f. It consists of. The flange portion 6f of the valve shaft holder 6 is fixed to the upper end of the valve body 30 by welding or the like. Further, inside the valve shaft holder 6, a storage chamber 6h for accommodating a valve guide 18 described later is formed.

Further, a female screw 6d is formed downward from the upper opening 6g of the first tubular portion 6a of the valve shaft holder 6 to a predetermined depth. Therefore, in the present embodiment, the valve shaft holder 6 functions as a female screw member. A screw connection A is formed by a male screw 41a formed on the outer circumference of the valve shaft 41 and a female screw 6d formed on the inner circumference of the first tubular portion 6a of the valve shaft holder 6.

Further, a pressure equalizing hole 51 is formed on the side surface of the second tubular portion 6b of the valve shaft holder 6, and the pressure equalizing hole 51 allows the valve shaft holder chamber 83 in the second tubular portion 6b and the rotor. It communicates with the containment chamber 67 (second back pressure chamber). By providing the pressure equalizing hole 51 in this way, the space for accommodating the rotor 4 of the case 60 and the space inside the valve shaft holder 6 are communicated with each other, so that the valve shaft holder 6 can be smoothly moved. it can.

Further, below the valve shaft 41, a tubular valve guide 18 is slidably arranged with respect to the accommodating chamber 6h of the valve shaft holder 6. The ceiling portion 21 side of the valve guide 18 is bent at a substantially right angle by press molding. A through hole 18a is formed in the ceiling portion 21. Further, a flange portion 41b is further 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 loose state so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction, and the flange portion 41b is a valve. It is arranged in the valve guide 18 so as to be rotatable with respect to the guide 18 and displaceable in the radial direction. Further, the valve shaft 41 is arranged so that the through hole 18a is inserted and the upper surface of the flange portion 41b faces the ceiling portion 21 of the valve guide 18. Since the flange portion 41b has a diameter larger than that of the through hole 18a of the valve guide 18, the valve shaft 41 is prevented from coming off.

Since the valve shaft 41 and the valve guide 18 can be moved in the radial direction to each other, the valve guide 18 and the valve guide 18 and the valve guide 18 and the valve guide 18 are not required to have a high degree of concentric mounting accuracy with respect to the arrangement positions of the valve shaft holder 6 and the valve shaft 41. Concentricity with the valve body 17 can be obtained.

A washer 70 having a through hole formed in the central portion is installed between the ceiling portion 21 of the valve guide 18 and the flange portion 41b of the valve shaft 41. The washer 70 is preferably a metal washer with a highly slippery surface, a highly slippery resin washer such as fluororesin, a metal washer coated with a highly slippery resin, or various resin washers containing a highly slippery resin.
Further, the compressed valve spring 27 and the spring receiver 35 are housed in the valve guide 18.

Next, the main part of the electric valve 2 in the first embodiment will be described. As shown in FIG. 1, a sliding member 91 (contact portion) is attached below the inner circumference of the rotor 4 which forms a part of the rotary drive portion X. The sliding member 91 comes into contact with the outer circumference of the second tubular portion 6b of the valve shaft holder 6 (female screw member) constituting the fixed drive portion Y when the rotor 4 rotates. Further, the sliding member 91 is made of a resin material such as polyphenylene sulfide (PPS), for example, like the valve shaft holder 6, and contains an additive to reduce the friction coefficient. As the additive, a fluororesin such as polytetrafluoroethylene (PTFE), carbon fiber, or the like is used. Further, the surface on the side in contact with the valve shaft holder 6 is configured to have low friction.

As shown in FIG. 2A, the sliding member 91 may be an annular member that goes around the inner circumference of the rotor 4, but may be composed of a plurality of members. For example, as shown in FIG. 2B, a pair of arcuate sliding members 91 may be attached to the inner circumference of the rotor 4. Further, as shown in FIG. 2C, a plurality of sliding members 91 may be individually provided on the inner circumference of the rotor 4.

According to the electric valve 2 in the first embodiment, the sliding member 91 absorbs the vibration during rotation of the rotor 4 caused by the gap between the male screw 41a and the female screw 6d, so that the valve shaft 41 Can be prevented from moving up, down, left and right to generate an operating noise.

Further, since the sliding member 91 slides on the outer circumference of the valve shaft holder 6 when the rotor 4 is rotated, the rotating shaft of the rotor 4 is not misaligned, so that the inner circumference of the case 60 and the rotor 4 are separated. It is also possible to prevent contact noise from being generated by contact. Further, since no axial pressure is applied between the male screw 41a and the female screw 6d, the durability of the electric valve 2 is not impaired.
Therefore, it is possible to provide an electric valve 2 capable of suppressing operating noise and contact noise while maintaining high operability and durability.

In the electric valve 2 of the first embodiment, the sliding member 91 may be attached to the outer circumference of the second tubular portion 6b of the valve shaft holder 6 (female screw member). In this case, when the rotor 4 rotates, the sliding member 91 slides with the inner circumference of the rotor 4, and the same effect as when the sliding member 91 is attached to the rotor 4 can be obtained.

Next, the electric valve according to the second embodiment will be described by omitting the description of the portion overlapping with the first embodiment as appropriate. 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 electric valve 2 according to the first embodiment. It will be explained using.

FIG. 3 is a diagram showing an electric valve 102 according to the second embodiment. As shown in FIG. 3, the diameter is made larger than the portion where the male screw 41a is formed between the male screw 41a and the flange portion 41b of the valve shaft 41, and buffers with the valve shaft holder 6 (female screw member). A shock absorber 41j is provided. The cushioning portion 41j is made of a metal such as stainless steel like the valve shaft 41, and the outer periphery of the cushioning portion 41j is formed with a second tubular portion 6b of the valve shaft holder 6 (female screw member) when the rotor 4 rotates. A sliding portion 93 (contact portion) that comes into contact is provided. The outer peripheral surface of the sliding portion 93 may be surface-treated so as to have low friction.

According to the electric valve 2 in 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 fixed to the driving portion Y when the rotor 4 is rotated. By sliding the valve shaft holder 6 to the inner peripheral surface of the constituent valve shaft holder 6, the rotary drive unit X is suppressed from wobbling, the valve shaft 41 moves in the vertical and horizontal directions to generate an operating noise, and the inner circumference of the case 60 is generated. It is possible to prevent the rotor 4 from coming into contact with the rotor 4 and generating a contact sound.

Further, since the sliding portion 93 can be slid with the inner peripheral surface of the valve shaft holder 6 made of the resin material having a reduced friction coefficient as described above, the operability of the electric valve 102 is not deteriorated. can do.

Next, the electric valve according to the third embodiment will be described by omitting the description of the portion overlapping with the first embodiment as appropriate. 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 configuration as the configuration of the electric valve 2 according to the first embodiment. It will be explained using.

FIG. 4 is a diagram showing an electric valve 104 according to the third embodiment. As shown in FIG. 4, below the inner circumference of the rotor 4 forming a part of the rotary drive unit X, it extends downward along the inner circumference of the rotor 4 and bends toward the valve shaft holder 6 and upwards. An elastic member 95 (contact portion) having a substantially U-shaped cross section is attached.

The elastic member 95 is made of a metal such as stainless steel, and a spring portion 95a that can be expanded and contracted in the radial direction of the rotor 4 by elasticity constitutes a fixed drive portion Y when the rotor 4 rotates. Contact with the second tubular portion 6b of the member).

In the electric valve 104, the load applied to the valve shaft holder 6 by the elastic member 95 is smaller than the load due to the pressure difference of the fluid passing through the clearance 22 formed between the valve body 17 and the valve port 16a. It is configured as follows.

According to the electric valve 104 in the third embodiment, by arranging the elastic member 95 on the inner circumference of the rotor 4, the rotor 4 is rotated due to the gap between the male screw 41a and the female screw 6d. Since the vibration is absorbed by the elastic force of the elastic member 95, the valve shaft 41 moves in the vertical and horizontal directions to generate an operating noise, and the inner circumference of the case 60 and the rotor 4 come into contact with each other to generate a contact noise. Can be prevented.

Next, the electric valve according to the fourth embodiment will be described by omitting the description of the portion overlapping with the third embodiment as appropriate. 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 configuration as the configuration of the electric valve 2 according to the third embodiment. It will be explained using.

FIG. 5 is a diagram showing an electric valve 106 according to the fourth embodiment. As shown in FIG. 5, the outer circumference of the fitting portion 6c of the valve shaft holder 6 constituting the fixed drive portion Y extends downward along the outer circumference of the fitting portion 6c and bends upward toward the spring receiver 35. An elastic member 97 (contact portion) having a substantially L-shaped cross section is attached.

The elastic member 97 is made of a metal such as stainless steel, and the spring portion 97a that can be expanded and contracted in the radial direction of the electric valve 106 by elasticity forms a part of the rotation drive portion X when the rotor 4 rotates. Contact with.

In the electric valve 106, the load applied to the valve shaft holder 6 by the elastic member 97 is smaller than the load due to the pressure difference of the fluid passing through the clearance 22 formed between the valve body 17 and the valve port 16a. It is configured as follows.

According to the electric valve 106 in the fourth embodiment, by arranging the elastic member 97 below the valve shaft holder 6, when the rotor 4 is rotated due to the gap between the male screw 41a and the female screw 6d. Since the vibration of the elastic member 97 is absorbed by the elastic force of the elastic member 97, the valve shaft 41 moves in the vertical and horizontal directions to generate an operating noise, and the inner circumference of the case 60 and the rotor 4 come into contact with each other to generate a contact noise. Can be prevented.

In the first embodiment described above, the case where the sliding member 91 is attached to the inner circumference of the rotor 4 has been described as an example, but the sliding member 91 is located below the inner circumference of the rotor 4. It may be integrally molded with the rotor 4. Similarly, the sliding member 91 may be integrally formed with the valve shaft holder 2 below the outer circumference of the valve shaft holder 2.

Further, in the above-described first embodiment, the case where the sliding member 91 is made of a resin material to which an additive having a low friction coefficient is added has been described as an example, but such an additive has been described. The surface treatment may be applied so as to have a low coefficient of friction without containing. In this case, the material of the sliding member 91 is not limited to the resin material, and metal may be used.

Further, in the second embodiment described above, the case where the surface treatment is applied so that the sliding portion 93 made of metal has a low friction coefficient has been described as an example, but the friction is low regardless of the surface treatment. It may be a coefficient. For example, the sliding portion 93 may be formed of a resin material to which an additive has been added so that the outer peripheral surface of the sliding portion 93 has a low coefficient of friction.

Further, in the third and fourth embodiments described above, the elastic members 95 and 97 may be an annular member that goes around the inner circumference of the rotor 4 as shown in FIG. 2A, but a plurality of elastic members 95 and 97 may be formed. It may be composed of the members of. For example, as shown in FIG. 2B, a pair of arcuate elastic members 95, 97 may be attached to the inner circumference of the rotor 4. Further, as shown in FIG. 2C, a plurality of elastic members 95 and 97 may be individually provided on the inner circumference of the rotor 4.

Further, 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, so that the friction coefficient is low. It has excellent durability. On the other hand, resin parts that are generally molded by injection molding are difficult to precisely mold in consideration of dimensional deformation such as sink marks and warpage due to injection molding and dimensional changes peculiar to resin molding such as linear expansion and swelling. In many cases.

Therefore, when the resin valve shaft holder 6 is adopted, the clearance generated in the engagement between the male screw 41a and the female screw 6d tends to be large. When this clearance becomes large, the valve shaft holder 6 moves in the vertical and horizontal directions when the rotor 4 rotates, and an operating noise is easily generated, or a contact noise is easily generated due to the contact between the inner circumference of the case 60 and the rotor 4.

However, as introduced in each of the above-described embodiments, the vibration caused by the gap between the male screw 41a and the female screw 6d is absorbed by interposing the contact portion between the rotary drive unit and the fixed drive unit. Will be done. Therefore, even when the resin valve shaft holder 6 is adopted, it is possible to accurately prevent the operation noise and the contact noise from being generated when the rotor 4 is rotated.

Further, the electric valve of each of the above-described embodiments is used as an expansion valve provided between the condenser and the evaporator in, for example, a refrigeration cycle system including a compressor, a condenser, an expansion valve, an evaporator and the like. Be done.

2, 102, 104, 106 Electric valve 4 Rotor 6 Valve shaft holder 6c Fitting part 6d Female screw 16a Valve port 17 Valve body 18 Valve guide 22 Clearance 33 Bush member 41 Valve shaft 41a Male screw 41b Border 41j Cushioning part 60 Case 91 Sliding member (contact part)
93 Sliding part (contact part)
95 Elastic member (contact part)
95a Spring part 97 Elastic member (contact part)
97a Spring part X Rotation drive part Y Fixed drive part

Claims (8)

The rotary motion of the rotor housed in the inner circumference of the case is converted into a linear motion by screwing the male screw member and the female screw member, and the valve body housed in the valve body is used as the axis based on this linear motion. An electric valve that moves in the direction
A rotary drive unit that includes the rotor, the male screw member, and the valve body and is driven as the rotor rotates.
A fixed drive unit that includes the female screw member and is not driven by the rotation of the rotor.
A contact portion that is arranged on either one of the rotary drive unit and the fixed drive unit and that contacts the other in the radial direction orthogonal to the axial direction when the rotor rotates is provided.
The rotary drive unit includes a tubular valve guide that transmits the linear motion of the male screw member to the valve body.
The contact portion is a sliding member or an elastic member, and is
The rotor is coupled to the male screw member via a bush member, so that the male screw member and the rotor move integrally in the vertical direction while rotating.
An electric valve characterized in that the valve body is integrally connected below the opening side of the case. The contact portion is arranged on the inner circumference of the rotor.
The electric valve according to claim 1, wherein the electric valve is a sliding member that comes into contact with the outer periphery of the female screw member when the rotor rotates. The contact portion is arranged on the outer circumference of the female screw member.
The electric valve according to claim 1, wherein the electric valve is a sliding member that comes into contact with the inner circumference of the rotor when the rotor rotates. A stator arranged on the outer periphery of the case rotates a rotor housed in the inner circumference of the case , and this rotational motion is converted into a linear motion by screwing a male screw member and a female screw member, and this linear motion is performed. It is an electric valve that moves the valve body housed in the valve body in the axial direction based on the above.
A rotary drive unit that includes the rotor, the male screw member, and the valve body and is driven as the rotor rotates.
A fixed drive unit including the female screw member and not driven by the rotation of the rotor is provided.
The rotary drive unit includes a tubular valve guide that transmits the linear motion of the male screw member to the valve body.
The male screw member is provided with a buffer portion that cushions the female screw member, and the outer periphery of the buffer portion has a sliding portion that comes into contact with the inner circumference of the female screw member when the rotor is rotated.
The rotor is coupled to the male screw member via a bush member, so that the male screw member and the rotor move integrally in the vertical direction while rotating.
An electric valve characterized in that the valve body is integrally connected below the opening side of the case. The contact portion is arranged on the inner circumference of the rotor.
The electric valve according to claim 1, wherein the electric valve is an elastic member that comes into contact with the outer periphery of the female screw member when the rotor rotates. The electric valve according to claim 1, wherein the contact portion is an elastic member arranged on the outer periphery of the female screw member and in contact with the outer periphery of the valve guide when the rotor rotates. The electric valve according to any one of claims 1 to 6, wherein the female screw member is made of a resin. A refrigeration cycle system including a compressor, a condenser, an expansion valve, an evaporator, and the like, wherein the electric valve according to any one of claims 1 to 7 is used as the expansion valve. system.

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