JP2021060120A - Motor valve and refrigeration cycle system - Google Patents

Abstract

To improve positional accuracy of a fixing position of a magnet rotor and a rotor shaft in a motor valve.SOLUTION: A first shaft part 11 and a second shaft part 12 whose diameter is larger than that of the first shaft part 11 are formed in a rotor shaft 1, and a step surface part 13 extending in a large-diameter direction from an axis side of the rotor shaft 1 is provided in a boundary part thereof. An insertion hole 23a through which the first shaft part 11 of the rotor shaft 1 is inserted is provided in a fixing member 23 of a magnet rotor, and an abutment surface part 23b extending in a large-diameter direction than an inner peripheral surface of the insertion hole 23a is abutted to the step surface part 13 of the rotor shaft 1. In a recessed corner part which is formed by the first shaft 11 and the step surface part 13 in the rotor shaft 1, a horizontal V groove 14 retracted from a projected corner part which is formed by the inner peripheral surface of the insertion hole 23a and the abutment surface part 23b in the magnet rotor is provided as a retracted part. The abutment surface part 23b at the side of the magnet rotor 2 is surely abutted to the step surface part 13 of the rotor shaft 1.SELECTED DRAWING: Figure 3

Description

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

Conventionally, as an electric valve of this type, there is a valve member that opens and closes a valve port by directly moving an operating shaft via a screw feed mechanism by rotating a magnet rotor of a stepping motor and opening and closing the valve member with a valve member connected to the operating shaft. Such an electric valve is disclosed in, for example, Japanese Patent Application Laid-Open No. 2016-89870 (Patent Document 1).

The electric valve of Patent Document 1 has a structure for fixing the magnet rotor and the valve shaft, and the valve shaft is inserted and fixed through a bush member (fixing member) provided in the shaft core portion of the magnet rotor. At that time, the open end of the insertion hole of the bush member is brought into contact with the stepped portion formed on the valve shaft.

Japanese Unexamined Patent Publication No. 2016-89870

In the technique of Patent Document 1 described above, as shown in FIG. 9, a bush member b (fixing member) is provided on the shaft core portion of the magnet rotor a, and the valve shaft c penetrates and is fixed through the bush member b. Has been done. Further, the bush member b is fixed to the stepped portion c1 of the valve shaft c. However, as shown in FIG. 10, for example, due to the machining accuracy of the valve shaft c during machining, an R portion X may be formed at the inside corner of the stepped portion c1 of the valve shaft c. If there is this R portion X, the contact position between the bush member b and the step portion c1 varies, the magnet rotor a is inclined and fixed with respect to the valve shaft c, or the valve shaft c is displaced in the axial direction. There is a possibility that it will be fixed in the state of being fixed. When the magnet rotor is tilted with respect to the valve shaft, the sealed case (can) accommodating the magnet rotor comes into contact with the magnet rotor, causing problems in durability and operability.

According to the present invention, in an electric valve in which a motor unit rotates a magnet rotor and a rotor shaft to open and close a valve port by moving the valve member forward and backward with the rotation of the rotor shaft, the position accuracy of the fixed position between the magnet rotor and the rotor shaft is accurate. The challenge is to increase.

The electric valve according to claim 1 is an electric valve in which a motor unit rotates a magnet rotor and a rotor shaft and opens and closes a valve port by moving the valve member forward and backward with the rotation of the rotor shaft. The rotor shaft is the first. At the boundary between the shaft portion, the second shaft portion having a diameter larger than that of the first shaft portion, the male screw portion formed on the second shaft portion, and the first shaft portion and the second shaft portion. The magnet rotor is formed to have a stepped surface portion extending in a large radial direction from the axis side of the rotor shaft, and the magnet rotor has a magnetic magnet body and a fixing member integrally molded with the magnet body. However, the fixing member has a substantially cylindrical shape and has an insertion hole for inserting the first shaft portion of the rotor shaft in the center, and a cylinder having an upper end portion having a diameter smaller than the outer diameter of the substantially cylindrical portion. In addition to having a portion, the total length in the axial direction of the fixing member is longer than the outer diameter of the first shaft portion, and extends in a larger diameter direction than the inner peripheral surface of the insertion hole so that it can come into contact with the stepped surface portion. The inside corner portion formed by the first shaft portion and the stepped surface portion of the rotor shaft is recessed radially inward from the outer surface of the first shaft portion. An annular recess formed around the axis of the rotor shaft is provided, and the contact surface portion of the fixing member is brought into contact with the stepped surface portion of the rotor shaft to form the magnet rotor and the rotor shaft. Is fixed to the rotor shaft by welding at a portion of the fixing member which is a part of the magnet rotor, and is fixed between the inner peripheral surface of the fixing member and the inner surface of the recess in the rotor shaft. It is characterized in that a gap is formed over the entire circumference around the axis of the rotor shaft.

The electric valve according to claim 2 is the electric valve according to claim 1, wherein the recess is reduced in diameter as the diameter of the first shaft portion of the rotor shaft toward the stepped surface portion side. A horizontal V-groove formed in an annular shape so as to extend the stepped surface portion toward the center, or a diameter of the first shaft portion of the rotor shaft having a predetermined width in the axial direction of the rotor shaft portion from the stepped surface portion side. The diameter is reduced, and the horizontal angular groove is formed in an annular shape so as to extend the stepped surface portion toward the center.

The other electric valve is an electric valve in which the motor portion rotates the magnet rotor and the rotor shaft, and the valve port is opened and closed by the advance / retreat movement of the valve member accompanying the rotation of the rotor shaft. The rotor shaft is the first shaft portion. A second shaft portion having a diameter larger than that of the first shaft portion, a male screw portion formed on the side of the second shaft portion opposite to the first shaft portion, and the first shaft portion and the second shaft portion. The magnet rotor is formed by having a stepped surface portion extending in a large radial direction from the axis side of the rotor shaft at a boundary portion with the portion, and the magnet rotor has an insertion hole through which the first shaft portion of the rotor shaft is inserted. The first shaft portion and the stepped surface portion of the rotor shaft are formed by having a contact surface portion that extends in a larger diameter direction than the inner peripheral surface of the insertion hole and can come into contact with the stepped surface portion. The inside corner formed by the rotor shaft is recessed toward the second shaft portion along the axial direction of the rotor shaft from the stepped surface portion, and the recess width in the radial direction of the rotor shaft is recessed toward the second shaft portion side. An annular vertical V-groove or an annular vertical V-groove extending around the axis of the rotor shaft formed so as to extend the first shaft portion in the axial direction. A recess having a predetermined width in the radial direction of the rotor shaft, which is recessed toward the second shaft portion along the axial direction from the stepped surface portion, so as to extend the first shaft portion in the axial direction. An annular vertical angular groove extending around the axis of the rotor shaft is provided, and the contact surface portion of the magnet rotor is brought into contact with the stepped surface portion of the rotor shaft to form the magnet rotor. And the rotor shaft are fixed.

As described above, in the electric valve of claim 1, the magnet rotor has a magnet body having magnetism and a fixing member integrally molded with the magnet body, and the fixing member has the insertion hole and the insertion hole. A contact surface portion is provided.

The refrigeration cycle system according to claim 3 is a refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, and the electric valve according to claim 1 or 2 is the expansion valve. It is characterized by being used.

According to the electric valve of claim 1 or 2, the inside corner portion formed by the first shaft portion and the stepped surface portion of the rotor shaft, and the outside corner portion formed by the inner peripheral surface and the contact surface portion of the insertion hole in the magnet rotor. Since at least one of the, has a retracted portion retracted from the other, the inside corner portion and the outside corner portion do not interfere with each other. Therefore, the stepped surface portion of the rotor shaft and the contact surface portion of the magnet rotor are surely in contact with each other, and the positioning accuracy of the fixed position between the magnet rotor and the rotor shaft is improved.

According to the refrigeration cycle system of claim 3, the same effect as that of claim 1 or 2 can be obtained.

It is a vertical sectional view of the electric valve of the 1st Embodiment of this invention. FIG. 5 is an enlarged cross-sectional view of a main part of a magnet rotor and a rotor shaft in the electric valve of the first embodiment. It is a partially enlarged view of FIG. FIG. 5 is an enlarged cross-sectional view of a main part for explaining an inside corner portion of a rotor shaft and an outside corner portion of a magnet rotor according to the first embodiment. It is an enlarged sectional view of the main part which shows the modification 1, the modification 2 and the modification 3 of the concave portion on the rotor shaft side in the first embodiment. FIG. 5 is an enlarged cross-sectional view of a main part of a magnet rotor and a rotor shaft in the electric valve of the second embodiment. It is a partially enlarged view of FIG. It is a figure which shows the refrigeration cycle system of an embodiment. It is an enlarged view of the main part of a conventional electric valve. It is a figure explaining an example of a problem in a conventional electric valve.

Next, an embodiment of the electric valve and the refrigeration cycle system 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 an enlarged cross-sectional view of a main part of a magnet rotor and a rotor shaft in the electric valve of the first embodiment, and FIG. It is a partially enlarged view of a part. The concept of "upper and lower" in the following description corresponds to the upper and lower parts in the drawing of FIG.

The electric valve 100 includes a stepping motor 10 as a "motor portion", a valve housing 40, a valve mechanism portion 50, and a sealed case 60 made of a non-magnetic material.

The sealed case 60 is formed in a substantially cylindrical shape with the upper end closed, and is airtightly fixed to the upper end of the valve housing 40 by welding or the like. The stepping motor 10 includes a rotor shaft 1, a magnet rotor 2 rotatably arranged inside the sealed case 60, a stator coil 3 arranged to face the magnet rotor 2 on the outer circumference of the sealed case 60, and the like. , It is composed of a yoke, exterior members, etc. (not shown). The rotor shaft 1 is attached to the center of the magnet rotor 2, and the rotor shaft 1 extends to the valve mechanism portion 50 side.

The valve housing 40 is made of stainless steel or the like and has a substantially cylindrical shape, and has a valve chamber 40R inside. A first joint pipe 41 conductive to the valve chamber 40R is connected to one side of the outer circumference of the valve housing 40, and a second joint pipe 42 is connected to a tubular portion extending downward from the lower end. Further, a valve seat ring 43 is fitted on the valve chamber 40R side of the second joint pipe 42. The inside of the valve seat ring 43 is a valve port 43a, and the second joint pipe 42 is conducted to the valve chamber 40R via the valve port 43a. The first joint pipe 41, the second joint pipe 42, and the valve seat ring 43 are fixed to the valve housing 40 by brazing or the like.

The valve mechanism portion 50 includes a support member 51, a valve holder 52, and a needle valve 53 as a “valve member”. The support member 51 is made of synthetic resin, for example, and is formed in a substantially cylindrical shape, and is fixed to the upper end of the valve housing 40 by welding or the like via a stainless steel flange portion 511 integrally provided on the outer periphery thereof by insert molding. Has been done. At the center of the support member 51, a female screw portion 51a coaxial with the axis L of the rotor shaft 1 and a screw hole thereof are formed, and a cylindrical guide hole 51b having a diameter larger than that of the screw hole of the female screw portion 51a is formed. ing.

The valve holder 52 is a cylindrical member, which is fitted in the guide hole 51b and slidably arranged in the L direction of the axis. The needle valve 53 is fixed to the lower end of the valve holder 52. A spring receiver 52a is provided in the valve holder 52 so as to be movable in the axis L direction, and a compression coil spring 52b is attached between the spring receiver 52a and the needle valve 53 in a state where a predetermined load is applied.

A male threaded portion 1a is formed on the outer periphery of the rotor shaft 1 on the support member 51 side, and the male threaded portion 1a is screwed into the female threaded portion 51a of the support member 51. Then, in the guide hole 51b of the support member 51, the upper end portion of the valve holder 52 is engaged with the lower end portion of the rotor shaft 1, and the valve holder 52 and the needle valve 53 are rotatably suspended by the rotor shaft 1. It is supported.

A guide holding cylinder 61 is fitted in the upper part of the sealed case 60, and the guide 62 is fitted in the central cylindrical portion 61a of the guide holding cylinder 61. The guide 62 has a guide hole 62a in the center, and the upper end portion of the rotor shaft 1 is rotatably fitted in the guide hole 62a. A spiral guide wire 63 is mounted on the outer periphery of the cylindrical portion 61a, and a movable stopper member 64 screwed into the spiral guide 63 is provided.

With the above configuration, the magnet rotor 2 and the rotor shaft 1 are rotated by driving the stepping motor 10, and the rotor shaft 1 is aligned with the screw feed mechanism between the male screw portion 1a of the rotor shaft 1 and the female screw portion 51a of the support member 51. Move in the L direction. Then, the valve member 53 moves in the L direction of the axis and approaches or separates from the valve seat ring 43. As a result, the valve port 43a is opened and closed, and the flow rate of the refrigerant flowing from the first joint pipe 41 to the second joint pipe 42 or from the second joint pipe 42 to the first joint pipe 41 is controlled.

Further, a protrusion 24 is formed on the magnet rotor 2, and the protrusion 24 kicks the movable stopper member 64 as the magnet rotor 2 rotates, so that the movable stopper member 64 and the spiral guide wire 63 are formed. It moves up and down while turning by screwing. Then, when the movable stopper member 64 comes into contact with the lower end stopper 63a of the spiral guide wire body 63, the rotation stopper action at the lowermost end position of the rotor shaft 1 can be obtained. Further, when the movable stopper member 64 comes into contact with the upper end stopper 61b of the guide holding cylinder 61, a rotation stopper action at the uppermost end position of the rotor shaft 1 can be obtained.

In this way, in the electric valve 100, the stepping motor 10 (motor unit) rotates the magnet rotor 2 and the rotor shaft 1, and the valve member 53 moves forward and backward with the rotation of the rotor shaft 1 to open and close the valve port 43a. Is.

The rotor shaft 1 is formed by processing a stainless steel rod member, and has a first shaft portion 11 located above the support member 51 and a second shaft portion 12 having a diameter larger than that of the first shaft portion 11. And have. The male screw portion 1a is formed in a portion of the second shaft portion 12 that is inserted into the support member 51. Further, due to the difference in diameter between the first shaft portion 11 and the second shaft portion 12, the boundary portion between the first shaft portion 11 and the second shaft portion 12 is located at the boundary portion between the first shaft portion 11 and the second shaft portion 12 from the axis L side of the rotor shaft 1 to the second shaft portion. It has a stepped surface portion 13 extending in the outer diameter direction of 12 and forming a surface perpendicular to the axis L of the rotor shaft 1.

The magnet rotor 2 has a cylindrical magnet portion 21 whose outer peripheral portion is magnetized in multiple poles, a disk portion 22 extending therein substantially in the central portion in the L direction of the axis, and a boss portion in the center of the disk portion 22. It has a fixing member 23 that functions as a hub provided in 22a, and a protrusion 24. The magnet portion 21, the disk portion 22, and the protrusion 24 form a "magnet body" as an integrally molded member made of PPS or the like, and the magnet portion 21 is molded by mixing magnetic powder with PPS or the like as a base material. ing. Further, the fixing member 23 is made of a metal such as stainless steel, and the fixing member 23 is integrally molded together with the magnet portion 21 and the disk portion 22 (the boss portion 22a thereof) by insert molding.

The fixing member 23, which is a part of the magnet rotor 2, has a substantially cylindrical shape having a cylindrical portion at the upper end portion, and a cylindrical insertion hole through which the first shaft portion 11 of the rotor shaft 1 is inserted is inserted in the center thereof. It has 23a. Further, the surface of the fixing member 23 on the support member 51 side is a surface extending outward (in the large diameter direction) from the axis L with respect to the inner peripheral surface of the insertion hole 23a, and this surface is the rotor shaft 1 The contact surface portion 23b is capable of contacting the stepped surface portion 13 of the above.

FIG. 4 shows a state in which the magnet rotor 2 is being assembled to the rotor shaft 1. As shown in the figure, in the rotor shaft 1, the outer peripheral surface of the first shaft portion 11 and the stepped surface portion 13 are at right angles so that the stepped surface portion 13 intersects the extension surface of the outer peripheral surface of the first shaft portion 11. It forms the inside corner A (the part surrounded by the alternate long and short dash line). Further, in the magnet rotor 2, the inner peripheral surface of the insertion hole 23a and the contact surface portion 23b form a right angle to form a protruding corner portion B (a portion surrounded by a alternate long and short dash line). The same applies to the inside corner portion A and the outside corner portion B in the modified example and the second embodiment described later, and FIG. 4 is also incorporated in the description of the modified example and the second embodiment.

In this first embodiment, the diameter of the first shaft portion 11 of the rotor shaft 1 is reduced toward the stepped surface portion 13 side, and the stepped surface portion 13 is extended toward the center side to form a “retracted portion”. An annular horizontal V-groove 14 is formed. Although FIG. 3 shows only the cross-sectional shape on one side, the horizontal V-groove 14 has an annular structure formed on the entire circumference around the axis L. That is, the horizontal V-groove 14 is provided so as to recede from the exit corner B on the magnet rotor 2 side to the center side at the entrance corner A of the rotor shaft 1. As a result, as shown in FIG. 3, the contact surface portion 23b of the magnet rotor 2 is in contact with the stepped surface portion 13 of the rotor shaft 1 in a state where the magnet rotor 2 is assembled to the rotor shaft 1. The magnet rotor 2 and the rotor shaft 1 are fixed by welding or the like at a portion of the fixing member 23.

As described above, the annular horizontal V-groove 14 as the "retracting portion" of the rotor shaft 1 allows the contact surface portion 23b on the magnet rotor 2 side to interfere with the inside corner portion A and the stepped surface portion of the rotor shaft 1. Since the magnet rotor 2 and the rotor shaft 1 can be reliably brought into contact with each other, the positional accuracy of the fixed positions of the magnet rotor 2 and the rotor shaft 1 is improved.

FIG. 5 is a diagram showing modifications 1 to 3 of the “retracted portion” in the first embodiment. In each of the following modifications and 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 4, and the overlapping description will be omitted as appropriate. Although the cross-sectional shape of only one side is shown in the figure, the following vertical V-groove 15, horizontal angular groove 16, and vertical angular groove 17 have an annular structure formed all around the axis L. There is.

In the modified example 1 of FIG. 5A, an annular vertical V-groove 15 is formed as a “retracting portion” by extending the first shaft portion 11 of the rotor shaft 1 in the axial direction. That is, the vertical V-groove 15 is provided so as to recede in the axial direction from the outside corner B (see FIG. 4) on the magnet rotor 2 side at the inside corner A (see FIG. 4) of the rotor shaft 1.

In the modified example 2 of FIG. 5B, the annular horizontal angular groove 16 as the “retracted portion” is formed by extending the stepped surface portion 13 of the rotor shaft 1 toward the center side. That is, the horizontal angular groove 16 is provided so as to recede from the outer corner B (see FIG. 4) on the magnet rotor 2 side to the center side at the inner corner A (see FIG. 4) of the rotor shaft 1.

In the modified example 3 of FIG. 5C, the first shaft portion 11 of the rotor shaft 1 is extended in the axial direction to form an annular vertical square groove 17 as a “retracted portion”. That is, the vertical angular groove 17 is provided so as to recede in the axial direction from the outer corner portion B (see FIG. 4) on the magnet rotor 2 side at the inner corner portion A (see FIG. 4) of the rotor shaft 1.

Also in the above modified examples 1 to 3, the vertical V-groove 15, the horizontal square groove 16, and the vertical square groove 17 ensure that the contact surface portion 23b on the magnet rotor 2 side abuts on the stepped surface portion 13 of the rotor shaft 1. Therefore, the positional accuracy of the fixed positions of the magnet rotor 2 and the rotor shaft 1 is improved.

FIG. 6 is an enlarged cross-sectional view of a main part of the magnet rotor 2 and the rotor shaft 1 in the electric valve of the second embodiment, and FIG. 7 is a partially enlarged view of the portion indicated by the alternate long and short dash line in FIG. In this second embodiment, an annular chamfered portion 23c as a "retracting portion" is formed around the lower opening of the insertion hole 23a of the fixing member 23. That is, the chamfered portion 23c is a surface that intersects the inner peripheral surface of the insertion hole 23a and the contact surface portion 23b, respectively, and the chamfered portion 23c is a protruding corner portion B (fixed member 23) of the magnet rotor 2 (fixing member 23). (See FIG. 4), it is provided so as to recede outward from the inside corner A (see FIG. 4) on the rotor shaft 1 side. As a result, as shown in FIG. 7, even if the R portion X is formed at the inside corner portion A of the rotor shaft 1, the contact surface portion 23b on the magnet rotor 2 side is reliably hit against the stepped surface portion 13 of the rotor shaft 1. It can be brought into contact with each other, and the positional accuracy of the fixed position between the magnet rotor 2 and the rotor shaft 1 is improved.

FIG. 8 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.

In the above example, the stepped surface portion 13 of the rotor shaft 1 and the contact surface portion 23b of the magnet rotor 2 are surfaces perpendicular to the axis L, but may be a surface substantially perpendicular to the axis L. Further, the surface is not limited to a right angle or a substantially right angle surface, and may be a surface having an inclination extending outward (large diameter direction) from the axis L side.

In the above embodiment, the case where the magnet rotor 2 is configured by insert molding the fixing member 23 with respect to the "magnet body" in which the magnet portion 21 and the disk portion 22 are integrated has been described. The member 23 may be omitted. That is, the present invention may be applied to a mounting structure in which the magnet rotor is composed of one member and functions as a hub thereof, and the rotor shaft.

Further, although an example in which the magnet rotor 2 and the rotor shaft 1 are fixed to each other by welding or the like has been described, the fixing method may be another method such as an adhesive.

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.

1 Rotor shaft 1a Male thread part 11 1st shaft part 12 2nd shaft part 13 Stepped surface part 14 Horizontal V groove (retracted part)
15 Vertical V-groove (retracted part)
16 Horizontal angle groove (retracted part)
17 Vertical angle groove (retracted part)
A Inside corner 2 Magnet rotor 21 Magnet part (magnet body)
22 Disc (magnet body)
22a Boss part 23 Fixing member 23a Insertion hole 23b Contact surface part 23c Chamfering part (retracted part)
B Outer corner 3 Stator coil 10 Stepping motor (motor part)
40 Valve housing 41 1st joint pipe 42 2nd joint pipe 43 Valve seat ring 43a Valve port 50 Valve mechanism 51 Support member 52 Valve holder 53 Needle valve (valve member)
51a Female thread 100 Electric valve (expansion valve)
200 Outdoor heat exchanger 300 Indoor heat exchanger 400 Flow switching valve 500 Compressor L axis

Claims (3)

In an electric valve in which the motor unit rotates the magnet rotor and the rotor shaft and opens and closes the valve port by moving the valve member forward and backward with the rotation of the rotor shaft.
The rotor shaft includes a first shaft portion, a second shaft portion having a diameter larger than that of the first shaft portion, a male screw portion formed on the second shaft portion, the first shaft portion, and the second shaft portion. It is formed with a stepped surface portion extending in the large diameter direction from the axis side of the rotor shaft at the boundary portion with the portion.
The magnet rotor has a magnet body having magnetism and a fixing member integrally molded with the magnet body, and the fixing member has a substantially columnar shape and has the first shaft of the rotor shaft in the center. It has an insertion hole through which the portion is inserted, and has a cylindrical portion at the upper end portion having a diameter smaller than the outer diameter of the substantially cylindrical portion, and the total length in the axial direction of the fixing member is larger than the outer diameter of the first shaft portion. It is also long, and is formed to have a contact surface portion that extends in a larger diameter direction than the inner peripheral surface of the insertion hole and can come into contact with the stepped surface portion.
The inside corner formed by the first shaft portion and the stepped surface portion of the rotor shaft is formed on the entire circumference around the axis of the rotor shaft, which is recessed radially inward from the outer surface of the first shaft portion. An annular recess is provided, the contact surface portion of the fixing member is in contact with the stepped surface portion of the rotor shaft, and the magnet rotor and the rotor shaft are a part of the magnet rotor. The rotor shaft is fixed to the member by welding, and a gap is formed between the inner peripheral surface of the fixing member and the inner surface of the recess in the rotor shaft over the entire circumference around the axis of the rotor shaft. An electric valve characterized by being formed. The recess is a horizontal V-groove formed in an annular shape so that the diameter of the first shaft portion of the rotor shaft is reduced toward the stepped surface portion side and the stepped surface portion is extended toward the center side. Or, the diameter of the first shaft portion of the rotor shaft is reduced by a predetermined width in the axial direction of the rotor shaft from the stepped surface portion side, and the stepped surface portion is extended toward the center side in an annular shape. The electric valve according to claim 1, wherein the horizontal square groove is formed. A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the electric valve according to claim 1 or 2 is used as the expansion valve. Refrigeration cycle system.

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