JP7164681B2 - Electric valve and refrigeration cycle system - Google Patents

Description

The present invention relates to an electrically operated valve and a refrigerating cycle system.

2. Description of the Related Art In general, a motor-operated valve is known that includes a screw feed mechanism and rotates a movable unit such as a rotor having a valve body to move forward and backward in an axial direction. As such an electric valve, a motor-operated valve in which a moving stopper is provided on the rotor and a fixed stopper is provided on the guide member has been proposed (see, for example, Patent Document 1). In the motor-operated valve disclosed in Patent Document 1, the rotation of the rotor is restricted by the stoppers coming into contact with each other with the circumferential direction being the collision direction, and the descent of the rotor is stopped.

JP 2010-223384 A

In the structure for stopping the descent of the movable unit by the contact between the stoppers as described in Patent Document 1, the contact area of the stoppers is set so that the surface pressure generated at the time of contact is a predetermined value. By the way, in order to move the movable unit by the screw feeding action, it is necessary to provide some margin (clearance) between the movable unit and the fixed unit that supports the movable unit. can move slightly. When the movable unit moves, the manner in which the stoppers abut against each other also changes, and the abutting area fluctuates. If the contact area becomes smaller than the design value, the surface pressure increases, and there is a possibility that the stopper will wear out.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrically operated valve and a refrigeration cycle system capable of suppressing wear of a stopper.

The motor-operated valve of the present invention includes a screw feed mechanism composed of a movable unit including a valve body and a fixed unit including a valve body, and the motor-operated valve is moved forward and backward in the axial direction by rotationally driving the movable unit by a driving means. In the valve, the movement of the movable unit in the axial direction is restricted by abutting the flat surface of the movable-side stopper of the movable unit and the flat surface of the fixed-side stopper of the fixed unit with the circumferential direction as a collision direction. The movable-side stopper is radially movable together with the screw portion of the movable unit, the upper portion of the magnet rotor of the movable unit is not supported in the radial direction, and the movable-side stopper One of the flat surfaces of the fixed side stopper and the fixed side stopper has a main contact area that contacts the other, and secondary contact areas that are arranged on both sides in the radial direction of the main contact area. The contact area is characterized by having a width equal to or larger than the radial dimension that allows the movable unit to move relative to the fixed unit.

According to this aspect of the invention, one of the movable-side stopper and the fixed-side stopper has a main contact area and a secondary contact area, and the width of the secondary contact area is such that the movable unit is positioned relative to the fixed unit. is greater than or equal to the radial dimension in which the movable unit moves in the radial direction, the portion of the other contact area that protrudes from the main contact area will contact the secondary contact area even if the movable unit moves in the radial direction. touch. As a result, it is possible to suppress the variation in the contact area between the stoppers, thereby suppressing the wear of the stoppers. Moreover, according to such a configuration, the contact area between the stoppers can be increased to reduce the surface pressure. Therefore, the wear of the stopper can be suppressed, and the life of the two stoppers can be extended.

At this time, in the electrically operated valve of the present invention, the movable side stopper is provided so as to be movable by a predetermined movable dimension in the radial direction from a reference state in which the central axes of the movable unit and the fixed unit are aligned, Preferably, the main contact area contacts the other stopper in the reference state. According to such a configuration, the entire contact area of the other is always in contact with the one, so that the contact area between the stoppers can be kept substantially constant, and wear of the stoppers can be suppressed.

Furthermore, in the motor operated valve of the present invention, it is preferable that the movable dimension includes a difference in effective radius between the male screw portion and the female screw portion in the screw feed mechanism. According to such a configuration, when the movable unit moves due to backlash generated between the screw portions, it is possible to keep the contact area between the stoppers substantially constant, thereby suppressing wear.

Further, in the motor operated valve of the present invention, the fixed unit has a threaded portion that is screwed with the movable unit, and a guide portion that guides the guided portion of the movable unit in the axial direction. may include a difference in inner and outer diameters between the guiding portion and the guided portion. According to such a configuration, when the movable unit moves due to backlash generated between the guide portion and the guided portion, it is possible to keep the contact area between the stoppers substantially constant, thereby suppressing wear.

Further, in the electrically operated valve of the present invention, the movable unit includes a member having the movable-side stopper and another member, and the movable dimension includes the member having the movable-side stopper and the It may also include the size of the gap between other members. According to such a configuration, even when the member having the movable-side stopper moves relative to another member, it is possible to keep the contact area between the stoppers substantially constant, thereby suppressing wear.

Further, in the electrically operated valve of the present invention, it is preferable that the movable side stopper and the fixed side stopper are each formed on a protrusion having a radial dimension larger than a circumferential dimension. According to such a configuration, it is possible to increase the contact area between the stoppers and reduce the surface pressure.

Further, in the electrically operated valve of the present invention, the portion including the contact area of the other of the movable side stopper and the fixed side stopper is the portion including the main contact area and the secondary contact area of the one. It is preferably made of a resin having a higher hardness than the above. One stopper (a stopper having a main contact area and a secondary contact area) has a variable contact area with the other stopper, whereas the other stopper contacts the one stopper over its entire contact area. It will happen. Therefore, the wear of the other stopper progresses more easily than the one stopper. Therefore, by making the hardness of the portion of the other stopper that includes the contact region higher than the hardness of the portion of the one stopper that includes the main contact region and the secondary contact region, the life of the two stoppers is extended. can do.

A refrigerating cycle system of the present invention is a refrigerating cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein any one of the motor-operated valves described above is used as the expansion valve. It is characterized by According to this aspect of the invention, since wear of the stopper is suppressed as described above, the stopper can easily function when the motor-operated valve is fully opened or closed, and a flow rate failure can be suppressed.

According to the electrically operated valve and the refrigeration cycle system of the present invention, one of the movable side stopper and the fixed side stopper has the main contact area and the secondary contact area, and the width of the secondary contact area is equal to or larger than the movable dimension. As a result, it is possible to keep the contact area between the stoppers substantially constant and suppress the wear of the stoppers.

FIG. 4 is a cross-sectional view showing a fully closed state of the motor-operated valve according to the embodiment of the present invention; FIG. 4 is a cross-sectional view showing a state in which a movable unit is in a fully opened state in the electric valve; It is a cross-sectional view showing a movable side stopper of the electric valve. FIG. 4 is a cross-sectional view showing a fixed-side stopper of the electric valve; It is a cross-sectional view showing a state in which the movable-side stopper and the fixed-side stopper abut. It is a cross-sectional view showing a state in which the movable-side stopper and the fixed-side stopper abut. It is a perspective view which shows the protrusion part in which the said movable side stopper was formed, and the protrusion part in which the said fixed side stopper was formed. It is a schematic block diagram which shows the refrigerating cycle system in which the said electrically-operated valve is used. FIG. 11 is a cross-sectional view showing a stopper of a motor-operated valve according to a modification; FIG. 11 is a cross-sectional view showing an electrically operated valve of another modified example;

Hereinafter, each embodiment of the present invention will be described based on the drawings. 1 and 2, the electrically operated valve 1A of this embodiment includes a valve body 2, a support member 3, a rotor 4, and a stepping motor 5 as driving means. , for example, is provided in a refrigeration cycle 100 of an air conditioner such as a package air conditioner or a room air conditioner. In FIG. 8, reference numeral 200 is an outdoor heat exchanger mounted on the outdoor unit, 300 is an indoor heat exchanger mounted on the indoor unit, 400 is a flow path switching valve forming a four-way valve, and 500 is a compressor. The motor-operated valve 1A, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are connected by conduits as shown, forming a heat pump refrigeration cycle. Note that the accumulator, pressure sensor, temperature sensor, etc. are omitted from the drawing. In this embodiment, the axial direction of the rotor 4 is defined as the Z direction, and two directions substantially perpendicular to the Z direction are defined as the X direction and the Y direction.

Note that the cross-sectional view of FIG. 1 is a cross section taken in the Z direction and a plane passing through the contact surfaces so that the contact surfaces of the respective stoppers, which will be described later, can be seen. It is a thing. At this time, the two contact surfaces that contact each other cannot be seen at the same time, but for convenience of explanation, two cross sections are depicted in FIG. The contact surface located on the front side in the Y direction with respect to the cross section is depicted as viewed from the back side to the front side. 2 to 6, 9 and 10 are also the same.

The valve body 2 is formed in a cylindrical shape and has a first opening 21 opened at one end side and a second opening 22 opened at a side surface. A first joint pipe 101 is connected to the first opening 21 , and a second joint pipe 102 is connected to the second opening 22 . A valve seat member 23 is provided in the first opening 21 . Hereinafter, the side of the valve body 2 where the first opening 21 is formed is defined as the Z-direction lower side, and the opposite side is defined as the Z-direction upper side.

The support member 3 has a disk-shaped flange portion 31 extending along the XY plane and a cylindrical holder portion 32 extending along the Z direction. The flange portion 31 is attached so as to block the other end side (upper side in the Z direction) of the valve body 2 , and the valve chamber 2</b>A is formed inside the valve body 2 . The valve body 2 and the support member 3 are fixed to each other by a mounting bracket 3a to form a fixed unit 20. As shown in FIG.

The holder portion 32 has a female screw portion 321 above the flange portion 31 in the Z direction, and further has a first guide portion 322 above. Further, the holder portion 32 has a second guide portion 323 below the flange portion 31 in the Z direction. The inner diameter of the first guide portion 322 is larger than the inner diameter of the female threaded portion 321 , and the inner diameter of the second guide portion 323 is smaller than the inner diameter of the female threaded portion 321 .

A stopper protrusion 324 is formed as a protrusion projecting radially outward from the upper end of the holder portion 32 in the Z direction. A portion of the stopper projection 324 on the upper side in the Z direction serves as a fixed side stopper 6U that restricts movement of the rotor 4 in the closing direction. The stopper protrusion 324 has a portion projecting downward in the Z direction at a position spaced radially outward from the cylindrical portion of the holder portion 32, and this projecting portion acts as a fixed-side stopper 6D that restricts movement of the rotor 4 in the opening direction. becomes.

The rotor 4 is formed in a rod shape extending along the Z direction, and has a needle portion 41 as a valve element formed at the tip (lower end in the Z direction), a male screw portion 42 formed substantially in the center in the Z direction, and a male screw portion 42 . A first guided portion 43 formed above the screw portion 42 in the Z direction, a stopper projection 44 as a projection formed above the first guided portion 43 in the Z direction, and a needle portion 41 . and a second guided portion 45 formed between the male screw portion 42 .

Specifically, the rotor 4 is composed of two members, a rotor shaft 11 and a valve stem 4A. The needle portion 41 and the second guided portion 45 are formed on the valve stem 4A. The male screw portion 42 , the first guided portion 43 and the stopper projection 44 are formed on the rotor shaft 11 . A fixing bracket 12 is fitted in an opening at the upper end of the rotor shaft 11 . A valve spring 13 is interposed between the lower end of this fixture 12 and the enlarged diameter portion 4A1 at the upper end of the valve stem 4A, and directs the valve stem 4A toward the valve seat 23 (that is, in the closing direction). to). Also, the valve stem 4A is slidable with respect to the rotor shaft 11 in the Z direction and the rotational direction.

The needle portion 41 can be seated on the valve seat member 23, and comes into contact with and separates from the valve seat member 23 as the rotor 4 advances and retreats along the Z direction. Thereby, the opening degree of the valve port 23a formed in the valve seat member 23 is adjusted.

The male threaded portion 42 is screwed with the female threaded portion 321 of the support member 3 . As a result, the rotor 4 is supported by the support member 3, and a screw feed mechanism is configured by the movable unit 10 and the fixed unit 20, which will be described later.

The first guided portion 43 is formed in a cylindrical shape with an outer diameter larger than the outer diameter of the male screw portion 42 and is arranged inside the first guide portion 322 of the support member 3 . The second guided portion 45 has an outer diameter smaller than the outer diameter of the male screw portion 42 and is arranged inside the second guide portion 323 .

The stopper projection 44 protrudes radially outward from a cylindrical portion continuous with the first guided portion 43 and has a portion protruding downward in the Z direction at a position spaced radially outward from this cylindrical portion. The portion that protrudes downward in the Z direction serves as a movable side stopper 7U that restricts movement of the rotor 4 in the closing direction.

The stepping motor 5 has a case 51 , a magnet rotor 52 and a stator coil 53 . The case 51 is fixed to the upper end of the valve body 2 in the Z direction by welding or the like together with the mounting bracket 3a. Thereby, the valve body 2 and the inside of the case 51 are kept airtight.

The magnet rotor 52 has its outer peripheral portion magnetized with multiple poles, and is fixed to the upper end portion of the rotor 4 by the fixing metal fitting 12 described above. As a result, the magnet rotor 52 and the rotor 4 rotate simultaneously. That is, the magnet rotor 52 and the rotor 4 constitute the movable unit 10 . The magnet rotor 52 has a cylindrical portion 521 extending downward in the Z direction from a portion fixed to the rotor 4, and stopper protrusions 522 as protrusions protruding radially inward from the inner peripheral surface of the cylindrical portion 521. . A part of the stopper protrusion 522 on the upper side in the Z direction serves as a movable side stopper 7D that restricts the movement of the rotor 4 in the opening direction.

A pulse current is supplied to the stator coil 53 from a power source controlled by appropriate control means. When a pulse current is supplied to the stator coil 53, the movable unit 10 rotates with the Z direction as the axial direction according to the number of pulses. The movable unit 10 that constitutes the screw feed mechanism advances and retreats in the Z direction by rotating. As a result, the opening degree of the valve port 23a is adjusted, and the flow rate of the fluid flowing from the first joint pipe 101 toward the second joint pipe 102 or the flow rate of the fluid flowing from the second joint pipe 102 toward the first joint pipe 101 is adjusted. is regulated.

When the movable unit 10 is rotated and moved in the closing direction (downward in the Z direction), when the needle portion 41 is seated on the valve seat member 23, as shown in FIG. 7U and the stationary side stopper 6U of the stationary unit 20 abut against each other with the circumferential direction as the collision direction. This restricts the movement of the movable unit 10 in the closing direction.

On the other hand, when the movable unit 10 is rotated and moved in the opening direction (upper side in the Z direction), when the needle portion 41 is separated from the valve seat member 23 by a predetermined distance, the movable unit 10 is opened as shown in FIG. and the stationary stopper 6D of the stationary unit 20 abut against each other with the circumferential direction as the collision direction. This restricts the movement of the movable unit 10 in the opening direction.

Predetermined gaps are formed between the rotor 4 and the support member 3 so that the movable unit 10 can move in the Z direction with respect to the fixed unit 20 . In this embodiment, between the female threaded portion 321 and the male threaded portion 42, between the first guide portion 322 and the first guided portion 43, and between the second guide portion 323 and the second guided portion A total of three gaps are formed between the first guiding portion 322 and the first guided portion 43, and the gap between the first guiding portion 322 and the first guided portion 43 is the smallest. The size of the gap between the first guiding portion 322 and the first guided portion 43 is determined by the inner diameter (radius) of the first guiding portion 322 and the outer diameter (radius) of the first guided portion 43. , which is the movable dimension ΔL. The movable dimension ΔL is a dimension (one-side dimension) that allows the movable unit 10 to move in each direction (radial direction) in the XY plane from a reference state in which the central axes of the movable unit 10 and the fixed unit 20 are aligned.

Details of the fixed side stopper 6U and the movable side stopper 7U will now be described with reference to FIGS. The movable-side stopper 7U has a rectangular contact area 71. As shown in FIG. Let W1 be the radial dimension (width) of the contact area 71 . On the other hand, the fixed side stopper 6U has a main contact area 61 and sub-contact areas 62 and 63 . The main contact area 61 is a portion that contacts the contact area 71 in the reference state, and is formed in a rectangular shape. Therefore, the radial dimension of the main contact area 61 is W1. Further, the contact area between the stoppers in the reference state is equal to the area of the contact region 71 (the area of the main contact region 61).

The secondary contact areas 62 and 63 are arranged on both sides of the primary contact area 61, and their radial dimensions W2 and W3 are both larger than the movable dimension .DELTA.L. The radial dimension W2 of the secondary contact area 62 and the radial dimension W3 of the secondary contact area 63 may be equal to or different from each other.

When the movable unit 10 moves radially outward to the maximum extent within the range of the movable dimension ΔL, the stoppers come into contact with each other as shown in FIG. A contact region 71 of the movable-side stopper 7U contacts the fixed-side stopper 6U across a main contact region 61 and a radially outer secondary contact region 62 . At this time, the entire contact area 71 comes into contact with the fixed-side stopper 6U, and the contact area between the stoppers is equal to the area of the contact area 71. As shown in FIG.

When the movable unit 10 moves radially inward to the maximum within the range of the movable dimension ΔL, the stoppers come into contact with each other as shown in FIG. The contact area 71 of the movable-side stopper 7U contacts the fixed-side stopper 6U across the main contact area 61 and the radially inner secondary contact area 63 . At this time, the entire contact area 71 comes into contact with the fixed-side stopper 6U, and the contact area between the stoppers is equal to the area of the contact area 71. As shown in FIG.

Thus, even when the movable unit 10 moves within the range of the movable dimension ΔL, the contact area 71 does not protrude from the contact area of the fixed side stopper 6U, and the contact area between the stoppers is As in the reference state, it is equal to the contact area 71 and kept substantially constant.

Further, as shown in FIG. 7, the radial dimension of the stopper projection 324 on which the fixed-side stopper 6U is formed is W1+W2+W3, and the circumferential dimension of the stopper projection 324 (rotational direction about the rotation axis of the movable unit 10). Greater than R1. The radial dimension of the stopper projection 44 on which the movable-side stopper 7U is formed is W1, which is larger than the circumferential dimension R2 of the stopper projection 44. As shown in FIG.

As described above, in the stopper that restricts the movement of the movable unit 10 in the closing direction, the fixed side stopper 6U has the main contact area 61 and the secondary contact areas 62 and 63. As for the stopper that restricts the movement in the opening direction, the fixed side stopper 6D similarly has a main contact area and a secondary contact area. Further, in the stopper that restricts the movement of the movable unit 10 in the opening direction, the radial dimension of the stopper protrusion 522 formed with the movable side stopper 7D is larger than the circumferential dimension thereof.

Also, the stopper protrusion 324 including the contact areas of the fixed side stoppers 6U and 6D and the stopper protrusion 44 including the contact area of the movable side stopper 7U are formed of different resins. Furthermore, the stopper projection 324 and the stopper projection 522 including the contact area of the movable side stopper 7D are made of different resins. Different resins mean different properties such as hardness, not only when the base materials are different, but also when additives of different amounts and types are added to the same base material.

Specifically, among a pair of movable side stoppers and fixed side stoppers that regulate movement in the opening direction or the closing direction, a stopper that does not have a secondary contact area (for example, a movable stopper for regulating the closing direction shown in FIG. 5) is used. The side stopper 7U) is made of a resin having higher hardness than the stopper having the main contact area and the sub-contact area (for example, the fixed side stopper 6U for restricting the closing direction shown in FIG. 5). Note that the index of hardness of the resin forming the stopper may be any index that is used for resin materials, such as Rockwell hardness and durometer hardness.

According to this embodiment, the following effects are obtained. That is, the fixed-side stopper 6U has a main contact area 61 and secondary contact areas 62 and 63, and the radial dimensions W2 and W3 of the secondary contact areas 62 and 63 are equal to or larger than the movable dimension ΔL. The entire contact area 71 of the side stopper 7U always contacts the fixed side stopper 6U. Therefore, regardless of the movement of the movable unit 10, the contact area between the stoppers can be kept substantially constant, and the surface pressure is less likely to fluctuate, thereby suppressing wear of the stoppers.

Further, since the movable dimension ΔL is the difference between the radii of the first guiding portion 322 and the first guided portion 43 , the distance between the first guiding portion 322 and the first guided portion 43 is When the movable unit 10 moves due to the backlash that occurs, the contact area between the stoppers can be kept substantially constant to suppress wear.

In addition, the stopper projections on which the fixed side stoppers 6U and 6D and the movable side stoppers 7U and 7D are respectively formed are formed so that the radial dimension is larger than the circumferential dimension, so that the stoppers do not contact each other. The surface pressure can be reduced by increasing the area.

Further, the stopper having no secondary contact area is made of a resin having a higher hardness than the stopper having the primary contact area and the secondary contact area, thereby extending the life of the two stoppers. be able to. A stopper having a main contact area and a secondary contact area has a variable contact area with the mating stopper. It comes into contact. Therefore, a stopper that does not have a secondary contact area is more likely to wear than a stopper that has a primary contact area and a secondary contact area. Therefore, by making the hardness of the stopper that does not have the secondary contact region higher than that of the stopper that has the primary contact region and the secondary contact region, the life of the two stoppers can be extended.

It should be noted that the present invention is not limited to the above-described embodiments, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention.

For example, in the above embodiment, the fixed side stopper has a main contact area and a secondary contact area, that is, the fixed side stopper has a larger radial dimension than the movable side stopper. 2, the movable side stopper 9U may have a larger radial dimension than the fixed side stopper 8U. The movable-side stopper 9U has a main contact area 91 and sub-contact areas 92 and 93 . The secondary contact areas 92 and 93 are formed on both sides of the primary contact area 91 in the radial direction, and both have a radial dimension equal to or larger than the movable dimension ΔL. In the form shown in FIG. 9, similarly to the above-described embodiment, the contact area between the stoppers can be kept substantially constant, and the surface pressure is less likely to fluctuate, thereby suppressing wear of the stoppers.

Further, the main contact area and the sub-contact area as in the above-described embodiment may be set to only one of the stopper that restricts movement in the closing direction and the stopper that restricts movement in the opening direction of the movable unit. .

Further, in the above embodiment, among the gaps formed between the movable unit 10 and the fixed unit 20, the gap between the first guide part 322 and the first guided part 43 is the smallest. , The radial dimensions W2 and W3 of the secondary contact areas 62 and 63 are set to be equal to or larger than the size of the gap (movable dimension ΔL). The size of this minimum gap is taken as the movable dimension, and the radial dimension of the auxiliary contact area should be equal to or larger than the movable dimension. For example, when the gap set between the male threaded portion 42 of the rotor 4 and the female threaded portion 321 of the support member 3 is the smallest, the radial dimension of the auxiliary contact area is equal to or larger than the size of the gap. I wish I had. The size of the gap between the male threaded portion 42 and the female threaded portion 321 is the difference in the effective radius (=1/2 of the effective diameter) between the threaded portions. Here, the effective diameter is defined in JISB0101 and is the diameter of a virtual cylinder (or cone) in which the width of the thread groove is equal to the width of the thread.

In the above embodiment, the movable dimension ΔL is determined only by the size of the gap formed between the movable unit 10 and the fixed unit 20. However, when the movable unit is composed of a plurality of members, these The movable dimension may include the size of the gap that occurs between the members. For example, when the movable dimension is determined by the size of the gap between the second guide portion 323 and the second guided portion 45 in the above embodiment, the movable dimension includes the third The size of the gap between the guide portion 325 and the third guided portion 49 of the rotor shaft 11 is also included.

Further, even in the case where the movable dimension is determined by the difference in the effective radius of the threaded portions as described above, if the movable unit includes a member having a movable side stopper and a member having a threaded portion, these The movable dimension includes the size of the gap generated between the members. Thus, the movable dimension may include the size of the gap between the member having the movable side stopper and the other member.

Further, in the above-described embodiment, the stopper projections on which the fixed side stoppers 6U and 6D and the movable side stoppers 7U and 7D are respectively formed are formed so that their radial dimensions are larger than their circumferential dimensions. However, it is not limited to such a configuration. For example, if the load applied to the proximal end portion of the stopper projection is large, the circumferential dimension of the stopper projection may be larger than the radial dimension. According to such a configuration, breakage at the proximal end portion of the stopper projection can be suppressed.

In the above embodiment, the entire stopper projection including the contact area of the fixed side stopper and the stopper protrusion including the contact area of the movable side stopper are made of different resins. Of the stopper projections, only the portions (surfaces) including the contact regions may be made of different resins. Also, these stopper protrusions may be formed of the same resin. If both of the two stopper projections are made of resin, it is possible to suppress wear of the stopper compared to the case where a resin stopper projection and a metal stopper projection are combined. At least one of the two stoppers may be made of metal.

In the above embodiment, the supporting member 3 of the fixed unit 20 has the female threaded portion 321 and the rotor 4 of the movable unit 10 has the male threaded portion 42. However, the motor operated valve 1B shown in FIG. , the supporting member 3B having the male threaded portion 33 and the rotor 4B having the female threaded portion 46 may be provided. In the electric valve 1B, the rotor 4B has a cylindrical rotor body 47 with a female threaded portion 46 formed on its inner peripheral surface, and the support member 3B is a tubular member with a male threaded portion 33 formed on its outer peripheral surface. 34. The tubular member 34 is accommodated in the tubular rotor main body 47 , the threaded portions are screwed together, and the rod-shaped valve stem 48 of the rotor 4</b>B is inserted through the tubular member 34 .

Also in the electric valve 1B, the fixed side stopper 6U has a main contact area and a secondary contact area with respect to the movable side stopper 7U. As a result, the contact area between the stoppers is kept substantially constant, and wear is suppressed.

In addition, although the best configuration, method, etc. for carrying out the present invention have been disclosed in the above description, the present invention is not limited thereto. That is, although the present invention has been particularly illustrated and described primarily with respect to particular embodiments, it may be modified in any manner to such embodiments without departing from the spirit and scope of the invention. , materials, quantity, and other detailed configurations can be modified in various ways by those skilled in the art. Therefore, the descriptions that limit the shape, material, etc. disclosed above are exemplified to facilitate understanding of the present invention, and do not limit the present invention. The description by the name of the member that removes all or part of the limitation such as is included in the present invention.

1A, 1B motor operated valve 321 female threaded portion 322 first guide portion 324 stopper projection (projection portion)
41 Needle part (valve element)
42 Male threaded portion 43 First guided portion 44 Stopper projection (projection)
5 stepping motor (driving means)
6U, 6D fixed side stopper 61 main contact area 62, 63 secondary contact area 7U, 7D movable side stopper 71 contact area 10 movable unit 20 fixed unit

Claims (9)

A motor-operated valve including a screw feed mechanism composed of a movable unit including a valve body and a fixed unit including a valve body, wherein the movable unit is rotationally driven by a driving means to move forward and backward in an axial direction,
A flat surface of the movable-side stopper of the movable unit and a flat surface of the fixed-side stopper of the fixed unit abut against each other with the circumferential direction as a collision direction, thereby restricting movement of the movable unit in the axial direction. is,
The movable-side stopper is radially movable together with the screw portion of the movable unit, and the upper portion of the magnet rotor of the movable unit is not supported in the radial direction,
A flat surface of one of the movable-side stopper and the fixed-side stopper has a main contact area that contacts the other, and sub-contact areas that are arranged on both sides in the radial direction of the main contact area. ,
The motor-operated valve, wherein the auxiliary contact area has a width equal to or greater than the radial dimension that allows the movable unit to move relative to the fixed unit. 2. The motor-operated valve according to claim 1, wherein a contact area between said movable side stopper and said fixed side stopper is equal to an area of said main contact area. The movable-side stopper is provided so as to be movable by a predetermined movable dimension in a radial direction from a reference state in which central axes of the movable unit and the fixed unit are aligned with each other,
3. The motor-operated valve according to claim 1, wherein the main contact area contacts the other stopper in the reference state. 4. The motor-operated valve according to claim 3, wherein the movable dimension includes a difference in effective radius between a male screw portion and a female screw portion in the screw feed mechanism. The fixed unit has a threaded portion that screws together with the movable unit, and a guide portion that guides the guided portion of the movable unit in the axial direction,
4. The motor-operated valve according to claim 3, wherein the movable dimension includes a difference between inner and outer diameters of the guide portion and the guided portion. the movable unit includes a member having the movable side stopper and another member,
6. The motor-operated valve according to claim 4, wherein the movable dimension includes the size of a gap between the member having the movable side stopper and the other member. 7. The movable-side stopper and the fixed-side stopper according to any one of claims 1 to 6, wherein each of the movable-side stoppers and the fixed-side stopper is formed on a projection portion whose radial dimension is larger than its circumferential dimension. electric valve. The other of the movable-side stopper and the fixed-side stopper has a portion including a contact area made of a resin having higher hardness than a portion including the main contact area and the sub-contact area of the one. The motor-operated valve according to any one of claims 1 to 7, characterized in that A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the motor-operated valve according to any one of claims 1 to 8 is used as the expansion valve. A refrigeration cycle system characterized by:

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