JP2021055709A - Motor-driven valve and refrigeration cycle system - Google Patents

Abstract

To secure a normal operation by equalizing spiral pitches of a spiral guide wire body in a motor-driven valve including a stopper mechanism composed of the spiral guide wire body and a movable slider.SOLUTION: A stopper mechanism 1 is composed of: a spiral guide wire body 12 constituting a spiral raceway around an axis L of a valve port 103a; a lower end stopper portion 122 extending from a lower end of the spiral guide wire body 12; a holding portion 11 for holding the spiral guide wire body 12; and a movable slider 13 engaged with the spiral guide wire body 12. The spiral guide wire body 12 is composed of a stationary continuous portion 12A held by the holding portion 11, and a locking portion 12B fixed by elastic deformation. The spiral guide wire body 12 is formed such that a pitch in an axis L direction of a wire material on the stationary continuous portion 12A and a pitch in an axis L direction of the wire material on the locking portion 12B are different from each other in a natural state.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric valve and a refrigeration cycle system used in a refrigeration cycle system or the like.

Conventionally, as an electric valve of this type, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 2003-74730 (Patent Document 1). This conventional electric valve is provided with a stopper mechanism, in which a spiral guide wire is attached to a cylindrical portion (holding portion) and a movable slider (movable stopper member) is screwed into the spiral guide wire. The rotor of the stepping motor rotates the movable slider to move it in the axial direction. Then, by abutting the movable slider against the stopper wire body portion, a predetermined rotor is stopped at a predetermined position. Further, the spiral guide wire is fixed by elastically fitting the engaging end at the end to the positioning hole of the cylindrical portion.

Japanese Unexamined Patent Publication No. 2003-74730

In the conventional solenoid valve of Patent Document 1, since the engaging end of the spiral guide wire is elastically fitted and fixed to the cylindrical portion (positioning hole), the spiral guide wire is engaged. The vicinity of the edge is deformed. Therefore, the pitch of the spiral at the deformed portion of the spiral guide wire may change, and the movable slider may be caught and the normal operation may be impaired.

An object of the present invention is to ensure normal operation by equalizing the spiral pitch of the spiral guide wire in an electric valve provided with a stopper mechanism including a spiral guide wire and a movable slider.

In the electric valve of the present invention, the rotary motion of the magnet rotor constituting the electric motor is converted into a linear motion of the valve body by a screw feed mechanism, and the valve body is moved forward and backward with respect to the valve port to allow fluid to pass through the valve port. The electric valve that controls the flow rate includes a stopper mechanism that regulates at least the lower end position of the magnet rotor, and the stopper mechanism includes a spiral guide wire body forming a spiral trajectory around the axis of the valve port and the spiral. The spiral guide wire is composed of a lower end stopper extending from the lower end of the guide wire, a holding portion for holding the spiral guide wire, and a movable slider screwed into the spiral guide wire. The spiral guide wire body is composed of a stationary continuous portion held by the holding portion and a locking action portion fixed by elastic deformation, and the spiral guide wire body naturally has a pitch in the axial direction of the wire rod in the stationary continuous portion. It is characterized in that the pitch of the wire rod in the locking action portion in the axial direction is different from that of the wire rod.

According to the present invention, when the spiral guide wire is elastically attached to the holding portion, the pitch in the axial direction of the wire rod depends on how the locking action portion of the spiral guide wire is deformed. The pitch can be made uniform, and the normal operation of the movable slider can be ensured.

At this time, the lower end stopper portion is included in the locking action portion, and the pitch of the wire rod in the locking action portion is larger than the pitch of the wire rod in the steady continuous portion in the natural state of the spiral guide wire body. The characteristic electric valve is preferable.

Further, at this time, in the natural state of the spiral guide wire body, the lower end stopper portion is inclined toward the end portion toward the axis line side as compared with the state in which the spiral guide wire body is assembled. An electric valve is preferred.

Further, it is preferable that the electric valve is characterized in that the lower end stopper portion is included in the locking acting portion and the pitch of the wire rod in the locking acting portion is smaller than the pitch of the wire rod in the steady continuous portion in a natural state. ..

Further, at this time, in the natural state of the spiral guide wire body, the lower end stopper portion is inclined toward the end portion so as to be inclined to the side opposite to the axis line as compared with the state in which the spiral guide wire body is assembled. The characteristic electric valve is preferable.

The refrigeration cycle system of the present invention is a refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, and the electric valve according to any one of claims 1 to 5 is the electric valve. It is characterized in that it is used as the expansion valve.

According to the electric valve and the refrigeration cycle system of the present invention, the pitch in the axial direction of the spiral guide wire body of the stopper mechanism becomes a uniform pitch, and the normal operation of the movable slider can be ensured.

It is a vertical sectional view of the electric valve of the 1st Embodiment of this invention. It is a side view of the spiral guide wire body in the natural state in the electric valve of 1st Embodiment. It is a vertical cross-sectional view of the main part in the state which the spiral guide wire body in the electric valve of 1st Embodiment is assembled. It is a vertical sectional view of the electric valve of the 2nd Embodiment of this invention. It is a side view of the spiral guide wire body in the natural state in the electric valve of 2nd Embodiment. It is a vertical cross-sectional view of the main part in the state which the spiral guide wire body in the electric valve of 2nd Embodiment is assembled. It is a vertical sectional view of the electric valve of the 3rd Embodiment of this invention. It is a side view of the spiral guide wire body in the natural state in the electric valve of 3rd Embodiment. It is a vertical cross-sectional view of the main part in the state which the spiral guide wire body in the electric valve of 3rd Embodiment is assembled. It is a vertical sectional view of the electric valve of the 4th Embodiment of this invention. It is a side view of the spiral guide wire body in the natural state in the electric valve of 4th Embodiment. It is a vertical cross-sectional view of the main part in the state which the spiral guide wire body in the electric valve of 4th Embodiment is assembled. It is a figure which shows the main part of the refrigeration cycle system of embodiment of this invention.

Next, an embodiment of the electric valve of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of the electric valve of the first embodiment, FIG. 2 is a side view of the spiral guide wire in the electric valve of the first embodiment in a natural state, and FIG. 3 is a spiral guide of the electric valve of the first embodiment. It is a vertical cross-sectional view of a main part in a state where a line body is assembled. The concept of "upper and lower" in the following description corresponds to upper and lower in the drawing.

The electric valve 100 includes a valve housing 10, a support member 20, a stopper mechanism 1, a needle valve 30 as a "valve body", and a stepping motor 40.

The valve housing 10 is made of stainless steel or the like and has a substantially cylindrical shape, and has a valve chamber 10R inside the valve housing 10. A first joint pipe 101 conductive to the valve chamber 10R is connected to one side of the outer circumference of the valve housing 10, and a second joint pipe 102 is connected to a tubular portion extending downward from the lower end. Further, a valve seat ring 103 is fitted on the valve chamber 10R side of the second joint pipe 102. The inside of the valve seat ring 103 is a valve port 103a, and the second joint pipe 102 is conducted to the valve chamber 10R via the valve port 103a. The first joint pipe 101, the second joint pipe 102, and the valve seat ring 103 are fixed to the valve housing 10 by brazing or the like. Further, a sealed case 104 is airtightly fixed to the upper end of the valve housing 10 by welding, and a stopper mechanism 1 described later is provided on the upper portion of the sealed case 104.

The support member 20 has a central holder portion 201, a thick base portion 202 on the outer circumference of the holder portion 201, and a fixing bracket 203, and the fixing bracket 203 is integrally provided together with the holder portion 201 and the base portion 202 by insert molding. ing. Then, the support member 20 is fixed to the upper end portion of the valve housing 10 by welding via the fixing metal fitting 203. At the center of the holder portion 201, a female screw portion 201a coaxial with the axis L and a screw hole thereof are formed, and a guide hole 201b is formed.

The needle valve 30 is provided at the lower end of the cylindrical valve holder 301, and the valve holder 301 is attached to the lower end of the rotor shaft 401 of the stepping motor 40. The valve holder 301 is fitted in the guide hole 201b of the support member 20 and slidably arranged in the axis L direction. Further, a spring receiver 302 is provided in the valve holder 301 so as to be movable in the axis L direction, and a compression coil spring 303 is mounted between the spring receiver 302 and the needle valve 30 in a state where a predetermined load is applied. There is.

The stepping motor 40 includes a rotor shaft 401, a magnet rotor 402 rotatably arranged inside the sealed case 104, a stator coil 403 arranged to face the magnet rotor 402 on the outer circumference of the sealed case 104, and the like. , It is composed of a yoke, exterior members, etc. (not shown). The rotor shaft 401 is attached to the center of the magnet rotor 402, and the rotor shaft 401 extends to the support member 20 side. A male threaded portion 401a is formed on the outer circumference of the rotor shaft 401 on the support member 20 side, and the male threaded portion 401a is screwed into the female threaded portion 201a of the support member 20. Then, in the guide hole 201b of the support member 20, the upper end portion of the valve holder 301 is engaged with the lower end portion of the rotor shaft 401, and the valve holder 301 and the needle valve 30 are rotatably suspended by the rotor shaft 401. It is supported. The upper end of the rotor shaft 401 is rotatably fitted in the guide 105 inside the stopper mechanism 1.

With the above configuration, the magnet rotor 402 and the rotor shaft 401 are rotated by driving the stepping motor 40, and the rotor shaft 401 is aligned with the screw feed mechanism between the male screw portion 401a of the rotor shaft 401 and the female screw portion 21a of the support member 2. Move in the L direction. Then, the needle valve 30 moves in the L direction of the axis line and approaches or separates from the valve seat ring 103. As a result, the valve port 103a is opened and closed, and the flow rate of the refrigerant flowing from the first joint pipe 101 to the second joint pipe 102 or from the second joint pipe 102 to the first joint pipe 101 is controlled.

The stopper mechanism 1 includes a cylindrical holding portion 11 protruding from the center of the inner case 11a fitted to the upper portion of the closed case 104, a spiral guide wire body 12 mounted on the outer circumference of the holding portion 11, and a spiral guide. It is configured to have a movable slider 13 screwed into the wire body 12. The spiral guide wire body 12 is formed by bending a metal wire rod, and has a guide portion 121 that forms a spiral trajectory around the axis L and a lower end stopper portion that is bent in parallel with the axis L at the lower end of the guide portion 121. It has 122 and a locking portion 123 extending in the radial direction on the axis L side from the lower end stopper portion 122. The locking portion 123 is locked in the recess 111 formed at the lower end of the holding portion 11. Further, the movable slider 13 is formed by bending a metal wire having a spring property, and has a claw portion 131 protruding outward in the radial direction.

A protrusion 402a is formed on the magnet rotor 402, and the protrusion 402a kicks the movable slider 13 as the magnet rotor 402 rotates, so that the movable slider 13 and the guide portion 121 of the spiral guide wire 12 are formed. It moves up and down while turning by screwing. Then, when the claw portion 131 of the movable slider 13 comes into contact with the lower end stopper 122 of the spiral guide wire body 12, the rotation stopper action at the lowermost end position of the rotor shaft 401 can be obtained. Further, when the movable slider 13 comes into contact with the convex portion 112 formed at the upper end of the holding portion 11, the rotation stopper action at the uppermost end position of the rotor shaft 401 can be obtained.

As shown in FIG. 2, the spiral guide wire body 12 in the natural state before being assembled as the stopper mechanism 1 has a steady continuous portion 12A in which the pitch in the axis L direction of the wire is “A” and the axis L direction of the wire. It is composed of a locking action portion 12B having a pitch of "B". The relationship of this pitch is
A <B
There is a relationship of. The lower end stopper portion 122 and the locking portion 123 are included in the locking action portion 12B, and in this natural state, the lower end stopper portion 122 is inclined toward the axis L side by an angle "θ" with respect to the axis L. .. Then, as shown in FIG. 3, when the spiral guide wire body 12 is assembled to the holding portion 11, the locking portion 123 is deformed against the elastic force of the locking portion 12B to form the locking portion 123 in the recess at the lower end of the holding portion 11. Lock in 111. The thick arrow in FIG. 3 is the elastic force that the locking portion 123 presses against the recess 111. By deforming the locking action portion 12B in this way, the locking action portion 12B is slightly compressed in the axis L direction, and the pitch “B” of the wire rod in the natural state in the locking action portion 12B is reduced. Therefore, the pitch "A" is the same as that of the steady-state continuous portion 12A. Therefore, the pitch of the spiral guide wire body 12 becomes an even pitch, a gap "H" between the spiral guide wire body 12 and the movable slider 13 can be secured, and the movable slider 13 does not get caught in the spiral guide wire body 12 and moves stably. It becomes.

(Example of the first embodiment) In this embodiment, the locking action portion 12B is two turns of the wire rod. The wire rod pitch "A" in the steady-state continuous portion 12A is A = 2.0 mm, and the wire rod pitch "B" in the locking action portion 12B in the natural state is B = 2.3 mm. Further, the "uniform pitch" means that the difference between the maximum and the minimum is within ± 0.2 mm and within ± 30% of the wire diameter of the wire rod of the movable slider 13. For example, when the wire diameter of the wire rod of the movable slider 13 is 0.7 mm, the maximum and minimum difference of the uniform pitch is within 0.21 mm. Therefore, the relationship of A <B is preferably such that the maximum and minimum difference (difference between A and B) exceeds ± 0.2 mm (B = A + 0.3 = 2.3, etc.), but the spiral guide wire. Since the range of the maximum and minimum difference of the "equal pitch" varies depending on the dimensions such as the wire diameter and pitch of the body 12 and the movable slider 13, B = A + 0.1 mm, B = A + 0.2 mm, and B = A + 0. In some cases, 0.4 mm or the like is preferable. Further, the angle “θ” between the lower end stopper portion 122 and the axis L is preferably around θ = 3 °.

FIG. 4 is a vertical cross-sectional view of the electric valve of the second embodiment, FIG. 5 is a side view of the spiral guide wire in the electric valve of the second embodiment in a natural state, and FIG. 6 is a spiral guide of the electric valve of the second embodiment. It is a vertical cross-sectional view of a main part in a state where a line body is assembled. Hereinafter, in the second embodiment, the same elements as those in the first embodiment are designated by the same reference numerals as those in FIGS. 1 to 3, and redundant description will be omitted as appropriate.

The difference between the second embodiment and the first embodiment is the configuration of the stopper mechanism 2. The stopper mechanism 2 includes a cylindrical holding portion 21 protruding from the center of the inner case 21a fitted to the upper portion of the sealed case 104, a spiral guide wire body 22 mounted on the outer circumference of the holding portion 21, and a spiral guide. It is configured to have a movable slider 23 screwed into the wire body 22. The spiral guide wire body 22 is formed by bending a metal wire rod, and has a guide portion 221 that forms a spiral trajectory around the axis L and a lower end stopper portion that is bent in parallel with the axis L at the lower end of the guide portion 221. It has 222 and an L-shaped locking portion 223 extending in the radial direction on the axis L side from the lower end stopper portion 222. Then, the locking portion 223 is locked in the hole portion 211 formed at the lower end of the holding portion 21. Further, the movable slider 23 is formed by bending a metal wire having a spring property, and has a claw portion 231 protruding outward in the radial direction.

Then, following the protrusion 402a of the magnet rotor 402, the movable slider 23 moves up and down while turning by screwing with the guide portion 221 of the spiral guide wire body 22. Then, the claw portion 231 of the movable slider 23 comes into contact with the lower end stopper 222 of the spiral guide wire body 22, so that the rotation stopper action at the lowermost end position of the rotor shaft 401 can be obtained. Further, when the movable slider 23 comes into contact with the convex portion 212 formed at the upper end of the holding portion 11, the rotation stopper action at the uppermost end position of the rotor shaft 401 can be obtained.

As shown in FIG. 5, the spiral guide wire body 22 in the natural state before being assembled as the stopper mechanism 2 has a steady continuous portion 22A in which the pitch in the axis L direction of the wire is “A” and the axis L direction of the wire. It is composed of a locking action portion 22C having a pitch of "C". The relationship of this pitch is
C <A
There is a relationship of. The lower end stopper portion 222 and the locking portion 223 are included in the locking action portion 22C, and in this natural state, the lower end stopper portion 222 is inclined to the side opposite to the axis L by an angle "θ" with respect to the axis L. doing. Then, as shown in FIG. 6, when the spiral guide wire body 22 is assembled to the holding portion 21, the locking portion 223 is deformed against the elastic force of the locking portion 22C to form the hole at the lower end of the holding portion 21. Locks in the portion 211. The thick arrow in FIG. 6 is the elastic force that the locking portion 223 presses the end portion of the hole portion 211 from the inside. By deforming the locking action portion 22C in this way, the locking action section 22C is slightly extended in the axis L direction, and the pitch “C” of the wire rod in the natural state in the locking action section 22C is expanded. Therefore, the pitch "A" is the same as that of the steady-state continuous portion 22A. Therefore, the pitch of the spiral guide wire body 22 becomes an even pitch, and the gap "H" between the spiral guide wire body 22 and the movable slider 23 can be appropriately secured so that, for example, "H" is not partially too wide. The movable slider 23 does not get caught in the spiral guide wire body 22 and has a stable movement.

(Example of the second embodiment) In this embodiment, the locking action portion 22C is two turns of the wire rod. The wire rod pitch "A" of the steady-state continuous portion 22A is A = 2.0 mm, and the wire rod pitch "C" in the locking action portion 22C in the natural state is C = 1.7 mm. Further, the "uniform pitch" means that the difference between the maximum and the minimum is within ± 0.2 mm and within ± 30% of the wire diameter of the wire rod of the movable slider 23. For example, when the wire diameter of the wire rod of the movable slider 23 is 0.7 mm, the maximum and minimum difference of the uniform pitch is within 0.21 mm. Therefore, the relationship of C <A is preferably such that the maximum and minimum difference (difference between A and C) exceeds ± 0.2 mm (C = A-0.3 = 1.7, etc.), but the spiral. Since the range of the maximum and minimum difference of the "uniform pitch" varies depending on the dimensions such as the wire diameter and pitch of the guide wire body 22 and the movable slider 23, C = A-0.1 mm and C = A-0. In some cases, 2 mm, C = A-0.4 mm, or the like is preferable. Further, the angle "θ" between the lower end stopper portion 222 and the axis L is preferably around θ = 3 °.

FIG. 7 is a vertical cross-sectional view of the electric valve of the third embodiment, FIG. 8 is a side view of the spiral guide wire in the electric valve of the third embodiment in a natural state, and FIG. 9 is a spiral guide of the electric valve of the third embodiment. It is a vertical cross-sectional view of a main part in a state where a line body is assembled.

The electric valve 100 includes a valve housing 50, a support member 60, a stopper mechanism 3, a needle valve 70 as a "valve body", and a stepping motor 80.

The valve housing 50 is made of stainless steel or the like and has a substantially cylindrical shape, and has a valve chamber 50R inside the valve housing 50. A first joint pipe 501 conductive to the valve chamber 50R is connected to one side of the outer circumference of the valve housing 50, and a second joint pipe 502 is connected to a tubular portion extending downward from the lower end. Further, a valve seat member 503 is fitted on the valve chamber 50R side of the second joint pipe 502. The inside of the valve seat member 503 is a valve port 503a, and the second joint pipe 502 is conducted to the valve chamber 50R via the valve port 503a. Further, the valve seat member 503 has a cylindrical guide portion 503b, and the inside thereof is a guide hole 503c. The first joint pipe 501, the second joint pipe 502, and the valve seat member 503 are fixed to the valve housing 50 by brazing or the like. Further, a sealed case 504 is airtightly fixed to the upper end of the valve housing 50 by welding, and the support member 60 in the sealed case 504 is provided with a stopper mechanism 3 described later.

The support member 60 has a holding portion 31 constituting the stopper mechanism 3, a base portion 602 at the lower portion of the holding portion 31, and a fixing metal fitting 603, and the fixing metal fitting 603 is integrated with the holding portion 31 and the base portion 602 by insert molding. It is provided in. Then, the support member 60 is fixed to the upper end portion of the valve housing 50 by welding via the fixing metal fitting 603. A female screw portion 31a coaxial with the axis L is formed at the center of the holding portion 31.

The needle valve 70 has a cylindrical valve holder portion 70a, and the valve holder portion 70a is attached to the lower end of the rotor shaft 801 of the stepping motor 80 via a spring receiver 701. The valve holder portion 70a is fitted in the guide hole 503c of the valve seat member 503 and is slidably arranged in the axis L direction. Further, a spring receiver 702 is provided in the valve holder portion 70a so as to be movable in the axis L direction, and a compression coil spring 703 is attached between the spring receiver 702 and the spring receiver 701 in a state where a predetermined load is applied. ing.

The stepping motor 80 includes a rotor shaft 801, a magnet rotor 802 rotatably arranged inside the sealed case 504, a stator coil 803 arranged to face the magnet rotor 802 on the outer circumference of the sealed case 504, and the like. , It is composed of a yoke, exterior members, etc. (not shown). The rotor shaft 801 is attached to the center of the magnet rotor 802, and the rotor shaft 801 extends to the support member 60 side. A male screw portion 801a is formed on the outer circumference of the rotor shaft 801 on the support member 60 side, and the male screw portion 801a is screwed into the female screw portion 31a of the support member 60.

With the above configuration, the magnet rotor 802 and the rotor shaft 801 are rotated by driving the stepping motor 80, and the rotor shaft 801 is aligned with the screw feed mechanism of the male screw portion 801a of the rotor shaft 801 and the female screw portion 31a of the holding portion 31. Move in the L direction. Then, the needle valve 70 moves in the L direction of the axis and approaches or separates from the valve seat member 503. As a result, the valve port 503a is opened and closed, and the flow rate of the refrigerant flowing from the first joint pipe 501 to the second joint pipe 502 or from the second joint pipe 502 to the first joint pipe 501 is controlled.

The stopper mechanism 3 includes a columnar holding portion 31 formed in the center of the support member 60, a spiral guide wire 32 mounted on the outer circumference of the holding portion 31, and a movable slider screwed into the spiral guide wire 32. It is configured to have 33. The spiral guide wire body 32 is formed by bending a metal wire rod, and has a guide portion 321 that forms a spiral trajectory around the axis L and an upper end stopper portion that is bent in parallel with the axis L at the upper end of the guide portion 321. 324, a lower end stopper portion 322 bent substantially parallel to the axis L at the lower end of the guide portion 321, and a locking portion 323 extending from the lower end stopper portion 322 in the tangential direction of the circumference centered on the axis L. And have. Then, the locking portion 323 is locked in the groove portion 602a formed in the base portion 602 of the support member 60. Further, the movable slider 33 is formed by bending a metal wire having a spring property, and has a claw portion 331 that protrudes outward in the radial direction.

The magnet rotor 802 is provided with a protrusion 802a, and the protrusion 802a kicks the movable slider 33 as the magnet rotor 802 rotates, so that the movable slider 33 and the guide portion 321 of the spiral guide wire 32 It moves up and down while turning by screwing. Then, when the claw portion 331 of the movable slider 33 comes into contact with the lower end stopper 322 of the spiral guide wire body 32, a rotation stopper action at the lowermost end position of the rotor shaft 801 can be obtained. Further, when the movable slider 33 comes into contact with the upper end stopper 324 of the spiral guide wire body 32, a rotation stopper action at the uppermost end position of the rotor shaft 801 can be obtained.

As shown in FIG. 8, the spiral guide wire body 32 in the natural state before being assembled as the stopper mechanism 3 has a steady continuous portion 32A in which the pitch in the axis L direction of the wire is “A” and the axis L direction of the wire. It is composed of a locking action portion 32B having a pitch of "B". The relationship of this pitch is
A <B
There is a relationship of. The lower end stopper portion 322 and the locking portion 323 are included in the locking action portion 32B, and in this natural state, the lower end stopper portion 322 is parallel to the axis L, and in the state of being assembled as the stopper mechanism 3. , It is inclined to the side opposite to the axis L by an angle "θ" with respect to the axis L. Then, as shown in FIG. 9, when the spiral guide wire body 32 is assembled to the holding portion 31, the locking portion 323 is deformed against the elastic force of the locking acting portion 32B to form the groove portion at the lower end of the support member 60. Lock within 602a. The thick arrow in FIG. 9 is the elastic force that the locking portion 323 presses inside the groove portion 602a. By deforming the locking action portion 32B in this way, the locking action section 32B is slightly compressed in the axis L direction, and the pitch “B” of the wire rod in the natural state in the locking action section 32B is reduced. Therefore, the pitch "A" is the same as that of the steady-state continuous portion 32A. Therefore, the pitch of the spiral guide wire 32 becomes a uniform pitch, a gap “H” between the spiral guide wire 32 and the movable slider 33 can be secured, and the movable slider 33 does not get caught in the spiral guide wire 32 and moves stably. It becomes.

(Example of the third embodiment) In this embodiment, the locking action portion 32B is two turns of the wire rod. The wire rod pitch "A" of the steady-state continuous portion 32A is A = 2.0 mm, and the wire rod pitch "B" in the locking action portion 32C in the natural state is B = 2.3 mm. Further, the "uniform pitch" means that the difference between the maximum and the minimum is within ± 0.2 mm and within ± 30% of the wire diameter of the wire rod of the movable slider 33. For example, when the wire diameter of the wire rod of the movable slider 33 is 0.7 mm, the maximum and minimum difference of the uniform pitch is within 0.21 mm. Therefore, the relationship of A <B is preferably such that the maximum and minimum difference (difference between A and B) exceeds ± 0.2 mm (B = A + 0.3 = 2.3, etc.), but the spiral guide wire. Since the range of the maximum and minimum difference of the "equal pitch" varies depending on the dimensions such as the wire diameter and pitch of the body 32 and the movable slider 33, B = A + 0.1 mm, B = A + 0.2 mm, etc., B = A + 0.4 mm may be preferable. Further, the angle "θ" between the lower end stopper portion 322 and the axis L is preferably around θ = 3 °.

10 is a vertical cross-sectional view of the electric valve of the fourth embodiment, FIG. 11 is a side view of the spiral guide wire in the electric valve of the fourth embodiment in a natural state, and FIG. 12 is a spiral guide of the electric valve of the fourth embodiment. It is a vertical cross-sectional view of a main part in a state where a line body is assembled. In the fourth embodiment, the same elements as those in the third embodiment are designated by the same reference numerals as those in FIGS. 7 to 9, and redundant description will be omitted as appropriate.

The difference between the fourth embodiment and the third embodiment is the configuration of the stopper mechanism 4. The stopper mechanism 4 includes a columnar holding portion 41 formed in the center of the support member 60, a spiral guide wire body 42 mounted on the outer circumference of the holding portion 41, and a movable slider screwed into the spiral guide wire body 42. It is configured to have 43 and. The spiral guide wire body 42 is formed by bending a metal wire rod, and has a guide portion 421 that forms a spiral trajectory around the axis L and a U-shaped portion 424 that protrudes in parallel with the axis L at the upper end of the guide portion 421. It has a lower end stopper portion 422 bent outward from the axis L at the lower end of the guide portion 421, and an L-shaped locking portion 423 extending downward from the lower end stopper portion 422. Then, the locking portion 423 is locked in the groove portion 602a formed in the base portion 602 of the support member 60. Further, the movable slider 43 is formed by bending a metal wire having a spring property, and has a claw portion 431 that projects outward in the radial direction.

Then, as in the third embodiment, the protrusion 802a of the magnet rotor 802 causes the protrusion 802a to kick the movable slider 43 as the magnet rotor 802 rotates, so that the movable slider 43 guides the spiral guide wire 42. It moves up and down while turning by screwing with the portion 421. Then, when the claw portion 431 of the movable slider 43 comes into contact with the lower end stopper 422 of the spiral guide wire body 42, a rotation stopper action at the lowermost end position of the rotor shaft 801 can be obtained. Further, when the movable slider 43 comes into contact with the U-shaped portion 424 of the spiral guide wire body 42, a rotation stopper action at the uppermost end position of the rotor shaft 801 can be obtained.

As shown in FIG. 11, the spiral guide wire body 42 in the natural state before being assembled as the stopper mechanism 4 has a steady continuous portion 42A in which the pitch in the axis L direction of the wire is “A” and the axis L direction of the wire. It is composed of a locking action portion 42D having a pitch of "D". The relationship of this pitch is
D <A
There is a relationship of. The U-shaped portion 424 is included in the locking action portion 42D. Then, as shown in FIG. 12, when the spiral guide wire body 42 is assembled to the holding portion 41, the U-shaped portion 424 is deformed against the elastic force of the locking action portion 42D to form the U-shaped portion 424 vertically at the upper end of the holding portion 41. Locks in the hole 41a. The thick arrow in FIG. 12 is the elastic force of the locking action portion 42D acting on the U-shaped portion 424. The locking portion 423 extending from the lower end stopper portion 422 is fixed to the fixing bracket 603 of the support member 60 by welding. By assembling the spiral guide wire body 42 to the holding portion 41 in this way, the locking acting portion 42D is slightly extended in the axis L direction, and the pitch “D” of the wire rod in the natural state in the locking acting portion 42D. Is expanded to have the same pitch “A” as the steady-state continuous portion 42A. Therefore, the pitch of the spiral guide wire 42 becomes a uniform pitch, and the gap “H” between the spiral guide wire 42 and the movable slider 43 can be appropriately secured even in the upper part of the spiral guide wire 42, for example, “H”. ] Can be partially prevented from becoming too wide, and the movable slider 43 can move stably without being caught by the spiral guide wire body 42.

(Example of the fourth embodiment) In this embodiment, the locking action portion 42D is two turns of the wire rod. The wire rod pitch "A" of the steady-state continuous portion 42A is A = 2.0 mm, and the wire rod pitch "D" in the locking action portion 42D in the natural state is D = 1.7 mm. Further, the "uniform pitch" means that the maximum and minimum difference is within ± 0.2 mm and within ± 30% of the wire diameter of the wire rod of the movable slider 43. For example, when the wire diameter of the wire rod of the movable slider 43 is 0.7 mm, the maximum and minimum difference of the uniform pitch is within 0.21 mm. Therefore, the relationship of D <A is preferably such that the maximum and minimum difference (difference between D and A) exceeds ± 0.2 mm (D = A-0.3 = 1.7, etc.), but the spiral. Since the range of the maximum and minimum difference of the "uniform pitch" varies depending on the dimensions such as the wire diameter and pitch of the guide wire body 42 and the movable slider 43, D = A-0.1 mm and D = A-0. In some cases, 2 mm, D = A-0.4 mm, or the like is preferable.

FIG. 13 is a diagram showing a refrigeration cycle system of the embodiment. In the figure, reference numeral 100 is an electric valve of the embodiment of the present invention constituting an expansion valve, 200 is an outdoor heat exchanger mounted on an outdoor unit, 300 is an indoor heat exchanger mounted on an indoor unit, and 400 is a four-way valve. The flow path switching valve 500 constituting the above is a compressor. The electric valve 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are each connected as shown by a conduit to form a heat pump type refrigeration cycle. The accumulator, pressure sensor, temperature sensor, etc. are not shown.

The flow path of the refrigeration cycle is switched between the flow path during the cooling operation and the flow path during the heating operation by the flow path switching valve 400. During the cooling operation, as shown by the solid arrow in the figure, the refrigerant compressed by the compressor 500 flows into the outdoor heat exchanger 200 from the flow path switching valve 400, and the outdoor heat exchanger 200 functions as a condenser. Then, the liquid refrigerant flowing out from the outdoor heat exchanger 200 flows into the indoor heat exchanger 300 via the electric valve 100, and the indoor heat exchanger 300 functions as an evaporator.

On the other hand, during the heating operation, as shown by the broken arrow in the figure, the refrigerant compressed by the compressor 500 is transferred from the flow path switching valve 400 to the indoor heat exchanger 300, the electric valve 100, the outdoor heat exchanger 200, and the flow path. The switching valve 400 and the compressor 500 are circulated in this order, the indoor heat exchanger 300 functions as a condenser, and the outdoor heat exchanger 200 functions as an evaporator. The electric valve 100 decompresses and expands the liquid refrigerant flowing from the outdoor heat exchanger 200 during the cooling operation and the liquid refrigerant flowing from the indoor heat exchanger 300 during the heating operation, and further controls the flow rate of the refrigerant.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design changes, etc. within the range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention. For example, the fixing method at the locking action portion of the spiral guide wire in the embodiment may be any fixing method as long as it is a fixing method using elastic force. Further, the spiral guide wire may have three different pitches depending on the configuration in which the third embodiment and the fourth embodiment are combined.

In the first to fourth embodiments, the locking action portions 12B, 22C, 32B, and 42D of the spiral guide wire have been described as two turns of the wire, but the locking is not limited to two turns. If the spirals of the spiral guide wire have a uniform pitch after the assembly, the number of turns may be less than 2 turns (1 turn, etc.) or more than 2 turns (3 turns, 4 turns, etc.).

10 Valve housing 10R Valve chamber 101 1st joint pipe 102 2nd joint pipe 103 Valve seat ring 103a Valve port 20 Support member 201 Holder part 201a Female thread part 202 Base part 203 Fixing bracket 30 Needle valve (valve body)
40 Stepping motor 401 Rotor shaft 401a Male screw part 402 Magnet rotor 402a Protrusion 1 Stopper mechanism 11 Holding part 111 Recession 12 Spiral guide wire 12A Constant continuous part 12B Locking action part 121 Guide part 122 Lower end stopper part 123 Locking part 13 Movable Slider 131 Claw L Axis 2 Stopper mechanism 21 Holding 22 Spiral guide wire 22A Steady continuous part 22C Locking action part 221 Guide part 222 Lower end stopper part 223 Locking part 23 Movable slider 231 Claw part 50 Valve housing 50R Valve chamber 501 1st joint pipe 502 2nd joint pipe 503 Valve seat member 503a Valve port 60 Support member 602 Base 603 Fixing bracket 70 Needle valve (valve body)
80 Stepping motor 801 Rotor shaft 801a Male screw part 802 Magnet rotor 802a Protrusion part 3 Stopper mechanism 31 Holding part 31a Female thread part 32 Spiral guide wire 32A Constant continuous part 32B Locking action part 321 Guide part 322 Lower end stopper part 323 Upper end stopper part 33 Movable slider 331 Claw part 4 Stopper mechanism 42 Spiral guide wire body 42A Constant continuous part 42D Locking action part 421 Guide part 422 Lower end stopper part 423 U-shaped part 43 Movable slider 431 Claw part

Claims (6)

In an electric valve that converts the rotary motion of the magnet rotor that constitutes the electric motor into a linear motion of the valve body by a screw feed mechanism, and moves the valve body forward and backward with respect to the valve port to control the flow rate of the fluid passing through the valve port. ,
A stopper mechanism for regulating at least the lower end position of the magnet rotor is provided.
The stopper mechanism holds a spiral guide wire body forming a spiral trajectory around the axis of the valve port, a lower end stopper portion extending from the lower end of the spiral guide wire body, and the spiral guide wire body. It is composed of a holding portion and a movable slider screwed into the spiral guide wire, and the spiral guide wire has a stationary continuous portion held by the holding portion and a locking action portion fixed by elastic deformation. The spiral guide wire body is characterized in that, in a natural state, the pitch of the wire rod in the stationary continuous portion in the axial direction and the pitch of the wire rod in the locking action portion in the axial direction are different. Electric valve. The lower end stopper portion is included in the locking action portion, and the pitch of the wire rod in the locking action portion is larger than the pitch of the wire rod in the steady continuous portion in the natural state of the spiral guide wire body. The electric valve according to claim 1. The second aspect of claim 2, wherein in the natural state of the spiral guide wire, the lower end stopper portion is inclined toward the axis side as compared with the state in which the spiral guide wire is assembled toward the end. Electric valve. The first aspect of claim 1, wherein the lower end stopper portion is included in the locking action portion, and the pitch of the wire rod in the locking action portion is smaller than the pitch of the wire rod in the steady continuous portion in a natural state. Electric valve. The claim is characterized in that, in the natural state of the spiral guide wire body, the lower end stopper portion is inclined toward the end portion so as to be inclined to the side opposite to the axis line as compared with the state in which the spiral guide wire body is assembled. 4. The electric valve according to 4. A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the electric valve according to any one of claims 1 to 5 is used as the expansion valve. A refrigeration cycle system characterized by that.

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