Motor-operated valve

Abstract

To provide a motor valve which can fix a guide member to a valve body while maintaining good workability.SOLUTION: A motor valve 1 includes a valve body 11 and a guide member 12. The valve body 11 has an opening 11a. The guide member 12 has a guide member body 121 and a fixing member 122. The fixing member 122 is fixed to an end surface 11b of the opening 11a. The guide member body 121 has press-fitting parts 1213 to be press-fitted in the opening 11a. The press-fitting part 1213 has: a close contact surface 1213a extending from a position where the close contact surface contacts with the fixing member 122 in an axis L direction; and an inclined surface 1213b which is continuous with the close contact surface 1213a and inclines to an inner side X1. The opening 11a is provided with inner periphery diameter enlarged parts 11d in each of which its diameter is enlarged to an outer side X2 relative to an inner peripheral surface 11c to form a burr housing space S with the close contact surface 1213a.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a motor-operated valve. [Background technology]

[0002] Conventionally, a motor-operated valve including a valve body, a valve element, and a drive unit is known (see Patent Document 1). In the motor-operated valve described in Patent Document 1, a guide member for guiding a main valve element (valve element) forward and backward in the axial direction is fixed inside a valve housing (valve body). The guide member includes a cylindrical resin guide portion and a metal flange portion insert-molded into the guide portion, and the flange portion is welded to the opening edge of the valve housing. The guide portion has a main valve guide hole for guiding the main valve element in the axial direction, and a press-fit portion provided so as to protrude radially outward, and the press-fit portion is press-fitted into an opening of the valve housing to achieve concentricity between the valve housing and the guide member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-95807 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional motor-operated valves as described above, when the press-fit portion of the guide part is pressed into the opening of the valve body, the resin press-fit portion is scraped off and burrs are generated. If this burr becomes caught between the opening edge of the valve body and the flange portion, the guide member becomes fixed in an inclined position relative to the valve body, which may affect the operability of the motor-operated valve.

[0005] An object of the present invention is to provide an electrically operated valve in which a guide member can be fixed to a valve body while maintaining good operability. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the object, the motor-operated valve of the present invention is an electric valve including a cylindrical valve body, a valve element that variably adjusts an opening area of ​​a valve port provided in the valve body, and a guide member that is fixed to the valve body and guides the valve element, wherein the valve body has an opening that opens to the opposite side to the valve port, and the guide member includes a resin guide member body and a metal fixing member fixed to the guide member body, and the fixing member Material The opening of the valve body of The guide member body is fixed to the end surface of the valve body. Axis The press-fit portion has a contact surface that extends in the axial direction from a position where it contacts the fixing member and contacts the inner circumferential surface of the valve body, and an inclined surface that is continuous with the contact surface and inclined radially inward, and the opening of the valve body is provided with an inner circumferential expansion portion that is expanded radially outward from the inner circumferential surface to form a space between the contact surface and the contact surface. In a cross-sectional view including the press-fit portion, a radial length dimension of a contact portion between the end face of the opening and the fixing member is larger than a radial length dimension of an opening between the close contact surface and the inner circumferential expansion portion, and the inner circumferential expansion portion is formed in a stepped shape having a first surface portion extending in the axial direction from the end face of the opening and a second surface portion extending radially inward from the first surface portion and continuing to the inner circumferential surface, and a burr accommodation space for accommodating burrs generated from the close contact surface is formed between the inner circumferential expansion portion and the close contact surface. It is characterized by:

[0007] According to the present invention, even if the press-fit portion is scraped and burrs are generated when the press-fit portion is pressed into the opening of the valve body, a space is formed between the inner peripheral enlarged portion of the valve body and the contact surface of the press-fit portion, so that the burrs can be contained in this space. That is, the space can be used as a burr containing space. Therefore, it is possible to prevent the burrs from being pinched between the opening edge of the valve body and the fixing member, which causes the fixing member to be fixed in a state tilted from the press-fit direction relative to the valve body, thereby inhibiting the operability of the motor-operated valve. Therefore, it is possible to provide an electric valve that can fix the guide member to the valve body while maintaining good operability. In addition, since the press-fit portion extends in the axial direction from the position where it contacts the fixing member, the fixing member can bear the stress generated in the press-fit portion when the guide member is fixed. Therefore, it is possible to inhibit deformation and damage of the guide member. In addition, the inclined surface of the press-fit portion functions as a guide for the press-fit portion when it is in sliding contact with the inner peripheral surface of the valve body, so that the assembly of the guide member is made easier and the assembly cost of the motor-operated valve can be reduced compared to a configuration without an inclined surface. Furthermore, by providing an inclined surface on the press-fit portion, the contact area between the press-fit portion and the inner peripheral surface of the valve body can be reduced, thereby further suppressing the occurrence of burrs.

[0008] Also ,child According to such a configuration, burrs generated when the press-fit portion is scraped off can be accommodated in the space having the stepped surface constituted by the first surface portion and the second surface portion. In addition, with this configuration, the fixing member, which is in contact with the valve body at a position of the press-fit portion with a contact width larger than the width dimension of the opening of the space between the sealing surface and the inner peripheral expanded portion, can be reliably fixed to the valve body by welding or the like, thereby improving the stability when the guide member is fixed to the valve body. Furthermore, by improving the stability of the guide member fixed to the valve body, the inclination of the guide member with respect to the valve body is suppressed, and the concentricity of the guide member can be improved.

[0009] Moreover, it is preferable that the length dimension in the axial direction of the first surface portion is smaller than the length dimension in the axial direction of the contact surface of the press-fit portion. With this configuration, even when the press-fit portion is pressed in, the contact surface extends beyond the first surface portion in the direction of the axis L. Therefore, the contact surface can be reliably brought into contact with the inner peripheral surface of the valve body that is continuous with the second surface portion.

[0012] The refrigeration cycle system of the present invention includes a compressor, a condenser, an expansion valve, and an evaporator, and any one of the motor-operated valves described above is used as the expansion valve. With this configuration, the refrigeration cycle system can be configured using, as the expansion valve, a motor-operated valve in which the guide member can be fixed to the valve body while maintaining good operability. 。 Effect of the Invention

[0013] According to the present invention, it is possible to provide an electrically operated valve in which a guide member can be fixed to a valve body while maintaining good operability. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is an assembled cross-sectional view of the motor-operated valve according to the embodiment of the present invention. [Diagram 2] FIG. 4 is a bottom view of the guide member as viewed from the axial direction. [Diagram 3] 2A is a partially enlarged view of FIG. 1 showing the contact portion between the valve body and the guide member, and FIG. 2B is a partially enlarged view showing the state in which burrs have occurred at the contact portion between the valve body and the guide member. [Figure 4] 1A is a partially enlarged view of the contact portion between the valve body and the guide member in a first modified example, and FIG. 1B is a partially enlarged view of the contact portion between the valve body and the guide member in a second modified example. [Diagram 5] FIG. 1 is a diagram showing an example of a refrigeration cycle system of the present invention. [Figure 6] FIG. 11 is a bottom view of a guide member according to a third modified example, as viewed from the axial direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 3 and 5. As shown in Fig. 1, the motor-operated valve 1 according to this embodiment includes a valve body 11, a guide member 12, a valve body 13 and a drive unit 14. In the following description, the axial direction of the motor-operated valve 1 is defined as the axial direction L, the side of the axial direction L where the drive unit 14 is located is defined as one side L1, and the opposite side of the one side L1 is defined as the other side L2. In addition, the direction perpendicular to the axial direction L is defined as the radial direction X. In addition, the side of the radial direction X where the axial direction L is located may be defined as the inner side X1, and the opposite side of the inner side X1 may be defined as the outer side X2. This is merely for convenience of description, and does not necessarily limit the directions in the actual use state of the motor-operated valve 1.

[0016] The valve body 11 is made of a metal material such as brass or stainless steel and is formed in a cylindrical shape with an opening 11a on one side L1 (the opposite side of a valve port 112a (valve port) described later), and defines a valve chamber 11A therein. As shown in Fig. 1, the valve body 11 includes a side wall 111 extending in the axial direction L, a bottom wall 112 formed at an end of the side wall 111 on the other side L2, and a cylindrical protrusion 113 extending from the center of the bottom wall 112 along the axial direction L to the other side L2.

[0017] An end of one side L1 of the side wall 111 forms an end face 11b of the opening 11a of the valve body 11. An inner peripheral surface of the side wall 111 forms an inner peripheral surface 11c of the valve body 11. A first opening 111a penetrating in the radial direction X is formed in the side wall 111. A cylindrical first coupling tube 15 is fitted into this first opening 111a, and the inside of the first coupling tube 15 forms a first port 15a. The first coupling tube 15 is fixed to the outer peripheral surface of the side wall 111 by brazing or the like while being fitted into the first opening 111a, and communicates with the valve chamber 11A via the first port 15a of the first coupling tube 15.

[0018] A valve port 112a is provided at the center of the bottom wall 112, penetrating in the direction of the axis L. Specifically, the valve port 112a is formed penetrating the center of the bottom wall 112. This valve port 112a communicates with the internal space of the protruding portion 113. A cylindrical second coupling pipe 16 is fitted into a second opening 113a on the inner peripheral surface of the protruding portion 113, and this second coupling pipe 16 is fixed to the outer peripheral surface of the protruding portion 113 by brazing or the like while being fitted into the second opening 113a. That is, the second coupling pipe 16 is fixed to the valve body 11 coaxially with the axis L. The second port 16a inside the second coupling pipe 16 communicates with the valve chamber 11A via the valve port 112a.

[0019] The guide member 12 is a member fixed to the valve body 11 and guides the valve element 13 back and forth in the direction of the axis L. The guide member 12 includes a cylindrical resin guide member body 121 and a metal annular fixing member 122 fixed to the guide member body 121 by insert molding. The guide member body 121 is made of PPS (polyphenylene sulfide) resin and includes a small diameter portion 1211 that constitutes one side L1, a large diameter portion 1212 that is formed with a larger diameter than the small diameter portion 1211 and constitutes the other side L2, and a press-fit portion 1213 that protrudes outward in the radial direction X from the outer circumferential surface of the large diameter portion 1212.

[0020] A female screw 1211a is formed in the center of the small diameter portion 1211 along the axis L. The female screw 1211a screws into a male screw 1431 formed on the outer circumferential surface of the rotor shaft 143, which will be described later, and constitutes a screw feed mechanism together with the male screw 1431. A guide groove 1211b formed in a spiral shape is formed on the outer circumferential surface of the small diameter portion 1211. The guide groove 1211b supports a slider 1441, which will be described later, and constitutes a rotation stopper mechanism 144 together with the slider 1441. A guide hole 1212a extending in the axis L is formed in the center of the large diameter portion 1212. A valve holder 132, which will be described later, is accommodated in the guide hole 1212a.

[0021] As shown in FIG. 2, four press-fitting portions 1213 are formed at equal intervals in the circumferential direction of the large diameter portion 1212, each of which protrudes from the outer circumferential surface of the large diameter portion 1212 in the radial direction X outward and extends in the axial direction L and is formed in a columnar shape. When the guide member 12 is fixed to the valve body 11, the press-fitting portions 1213 are press-fitted into the opening 11a of the valve body 11 in the axial direction L direction. As shown in FIG. 2, the press-fitting portions 1213 are formed in a convex arc shape in the protruding direction (outward in the radial direction X) when viewed from the bottom, and a part of the outer circumferential surface thereof constitutes a later-described sealing surface 1213a having an R-shape with the width of the press-fitting portions 1213 as a diameter. In this embodiment, four press-fitting portions 1213 are formed, but the number of the press-fitting portions 1213 is not limited to this, and may be four or less or four or more. However, it is preferable to provide at least three press-fit portions 1213 from the viewpoint of maintaining the concentricity of the valve body 11 and the guide member 12. In addition, the press-fit portion 1213 may be formed around the entire circumference of the large diameter portion 1212.

[0022] The fixing member 122 is formed in an annular shape from a metal plate member such as brass or stainless steel, and is integrated with the press-fit portion 1213 by insert molding. That is, the fixing member 122 is fixed to the guide member main body 121. The outer peripheral end of the fixing member 122 protrudes from the press-fit portion 1213 to the outside X2, and the abutting surface 122a, which is the surface on the other side L2 of this protruding portion, is fixed to the end face 11b by welding or the like, by welding the inside corner between the end face 11b and the outer peripheral end of the fixing member 122 in a state of contact with the end face 11b of the opening 11a of the valve main body 11. That is, the fixing member 122 is fixed to the end face 11b of the opening 11a of the valve main body 11, and the guide member 12 is fixed to the valve main body 11.

[0023] The valve body 13 includes a valve body portion 131 that variably adjusts the opening area of ​​the valve port 112a, and a valve holder 132 that holds the upper end of the valve body portion 131. The valve body portion 131 is formed in a shaft shape extending in the axial direction L, and includes a needle portion 1311 formed at the tip of the other side L2, a disk-shaped flange portion 1312 formed on one side L1 and expanding in the radial direction X, and a cylindrical expansion portion 1313 continuous with the surface of the one side L1 of the flange portion 1312. The needle portion 1311 is formed in a tapered shape that decreases in diameter toward the other side L2, and is inserted into the valve port 112a along the axial direction L.

[0024] When the needle portion 1311 moves to the limit position to which it can move on the other side L2, it seats on the valve port 112a and closes the valve port 112a, and when the needle portion 1311 moves from this state to the one side L1, the valve port 112a gradually opens. Note that in this embodiment, the needle portion 1311 is configured to seat on the valve port 112a and close the valve port 112a, but it is not necessary for the needle portion 1311 to seat on the valve port 112a, and a gap may be formed between the needle portion 1311 and the valve port 112a even when the needle portion 1311 moves to the limit position to which it can move on the other side L2 (lowest position). In other words, the needle portion 1311 may be configured to approach or move away from the valve port 112a.

[0025] The flange portion 1312 is formed so as to protrude from the outer peripheral surface of the valve body portion 131 of the valve holder 132 toward the outside X2 over the entire circumference. The surface of the flange portion 1312 facing the one side L1 abuts against the opening edge of the valve holder 132 in the axial direction L. The enlarged portion 1313 is formed so as to have a diameter smaller than that of the flange portion 1312 and larger than that of the needle portion 1311. The enlarged portion 1313 fits into the inner peripheral surface of the valve holder 132. In this way, the valve body portion 131 is fixed to the valve holder 132 with the enlarged portion 1313 fitting into the inner peripheral surface of the valve holder 132 and the surface of the one side L1 of the flange portion 1312 abutting against the opening edge of the valve holder 132.

[0026] The valve holder 132 includes a cylindrical portion 1321, a spring bearing 1322, a compression coil spring 1323, and a washer 1324. The cylindrical portion 1321 is formed in a bottomed cylindrical shape that opens to the other side L2, and is fitted into the guide hole 1212a of the guide member main body 121 so as to be movable in the axial direction L, and its outer circumferential surface is guided by the inner circumferential surface of the guide hole 1212a. The end of the rotor shaft 143 on the other side L2, which will be described later, is inserted into the center of the bottom wall (wall part of the one side L1) of the cylindrical portion 1321. As described above, the enlarged portion 1313 of the valve body portion 131 is fitted into the inner circumferential surface of the cylindrical portion 1321. As described above, the surface of the flange portion 1312 of the valve body portion 131 facing the one side L1 abuts against the open end edge (end edge of the other side L2) of the cylindrical portion 1321.

[0027] The spring receiver 1322 includes a cylindrical large diameter portion 1322a guided by the inner circumferential surface of the cylindrical portion 1321, and a cylindrical small diameter portion 1322b having a smaller diameter dimension than the large diameter portion 1322a and extending from the center of the large diameter portion 1322a to the other side L2 along the axis L. The compression coil spring 1323 is interposed between the spring receiver 1322 and the enlarged portion 1313 of the valve body portion 131. The washer 1324 is disposed at a position in contact with the inner surface of the bottom wall of the cylindrical portion 1321.

[0028] The driving unit 14 includes a cylindrical case 141 with a bottom that opens to the other side L2, a magnet rotor 142 arranged in the case 141, a rotor shaft 143, a stator coil (not shown), and a rotation stopper mechanism 144. The case 141 is made of a metal material and is formed into a cylindrical shape with a bottom, and is fixed to the valve body 11 by welding the open end edge to the end face 11b of the opening 11a of the valve body 11. The magnet rotor 142 is formed by mixing magnetic powder into a resin material such as PPS resin as a base material, and the outer periphery is magnetized with multiple poles. A bush member 142a made of a metal material is insert-molded in the center of the magnet rotor 142, and the end face of the one side L1 of the bush member 142a and the rotor shaft 143 are fixed by welding. As a result, the magnet rotor 142 is supported so as to be rotatable around the axis L together with the rotor shaft 143 fixed to the center and to be movable forward and backward in the direction of the axis L.

[0029] The rotor shaft 143 is fixed to the center of the magnet rotor 142, extends in the direction of the axis L, and is supported so as to be rotatable around the direction of the axis L and to be movable forward and backward in the direction of the axis L while being guided by the guide member 12. A male screw portion 1431 that screws into the female screw portion 1211a to form a screw feed mechanism is formed on the outer circumferential surface of the rotor shaft 143. A flange portion 1432 is formed on the end of the other side L2 of the rotor shaft 143. The flange portion 1432 is located inside the cylindrical portion 1321 of the valve holder 132, and is sandwiched between the washer 1324 and the large diameter portion 1322a of the spring bearing 1322 in the direction of the axis L to be integrated with the valve holder 132. That is, the valve holder 132 is provided on the other side L2 of the rotor shaft 143, and the rotor shaft 143 is provided in a state in which it can be moved forward and backward within the cylindrical portion 1321 of the valve holder 132, and is prevented from coming off.

[0030] A stator coil (not shown) is disposed on the outer periphery of the case 141, and a pulse signal is applied to the stator coil to rotate the magnet rotor 142 according to the number of pulses. When the magnet rotor 142 rotates, the rotor shaft 143 is screw-fed by the screw feed mechanism described above and moves back and forth in the direction of the axis L. As a result, the valve holder 132 integrated with the end of the other side L2 of the rotor shaft 143 and the valve body portion 131 fixed to the valve holder 132 also move back and forth in the direction of the axis L in accordance with the movement of the rotor shaft 143, so that the opening area of ​​the valve port 112a is variably adjusted by the needle portion 1311 of the valve body portion 131, and the flow rate of the refrigerant (fluid) flowing through the first joint pipe 15, the valve chamber 11A, and the second joint pipe 16 is adjusted.

[0031] The rotation stopper mechanism 144 includes the guide groove 1211b of the guide member 12 and a coil-shaped slider 1441 that is screwed into the guide groove 1211b. The slider 1441 includes a claw portion 1441a that protrudes outward in the radial direction X. The claw portion 1441a can abut against an inner edge of the magnet rotor 142 in the radial direction X around the axis L. Therefore, when the magnet rotor 142 rotates, the slider 1441 rotates following the rotation, and the slider 1441 is guided by the guide groove 1211b to move to one side L1 or the other side L2. When the slider 1441 abuts against the end of the guide groove 1211b on one side L1 or the end of the other side L2, the slider 1441 cannot rotate any more, and the rotation of the magnet rotor 142 is forcibly stopped.

[0032] Next, the refrigeration cycle system of the present invention will be described with reference to Fig. 5. Fig. 5 is a diagram showing an example of the refrigeration cycle system of the present invention. In Fig. 5, reference numeral 100 denotes an expansion valve using the motor-operated valve 1 of each of the above-mentioned embodiments, 200 denotes an outdoor heat exchanger mounted on an outdoor unit, 300 denotes an indoor heat exchanger mounted on an indoor unit, 400 denotes a flow path switching valve constituting a four-way valve, and 500 denotes a compressor. The expansion 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 by a conduit as shown in the figure, and constitute a heat pump type refrigeration cycle. Note that an accumulator, a pressure sensor, a temperature sensor, and the like are omitted from the illustration.

[0033] The flow path of the refrigeration cycle is switched between two flow paths, one for cooling operation and the other for heating operation, by the flow path switching valve 400. During cooling operation, as shown by the solid arrows in Fig. 5, the refrigerant compressed by the compressor 500 flows from the flow path switching valve 400 into the outdoor heat exchanger 200, which functions as a condenser, and the liquid refrigerant flowing out of the outdoor heat exchanger 200 flows through the expansion valve 100 into the indoor heat exchanger 300, which functions as an evaporator.

[0034] On the other hand, during heating operation, as shown by the dashed arrows in Figure 5, the refrigerant compressed by the compressor 500 is circulated from the flow path switching valve 400 to the indoor heat exchanger 300, the expansion valve 100, the outdoor heat exchanger 200, and then the compressor 500, with the indoor heat exchanger 300 functioning as a condenser and the outdoor heat exchanger 200 functioning as an evaporator.

[0035] The expansion valve 100 reduces the pressure and expands the liquid refrigerant flowing in from the outdoor heat exchanger 200 during cooling operation, or the liquid refrigerant flowing in from the indoor heat exchanger 300 during heating operation, and further controls the flow rate of the refrigerant. Note that in Fig. 5, the expansion valve 100 is provided in the refrigeration cycle so that the liquid refrigerant from the outdoor heat exchanger 200 flows into the first joint pipe 15 of the expansion valve 100 during cooling operation, and the liquid refrigerant from the indoor heat exchanger 300 flows into the second joint pipe 16 of the expansion valve 100 during heating operation, but the invention is not limited to this. The expansion valve 100 may be provided in the refrigeration cycle so that the liquid refrigerant from the outdoor heat exchanger 200 flows into the second joint pipe 16 of the expansion valve 100 during cooling operation, and the liquid refrigerant from the indoor heat exchanger 300 flows into the first joint pipe 15 of the expansion valve 100 during heating operation.

[0036] Next, a detailed description will be given of the structure of the contact portion between the valve body 11 and the guide member 12. Fig. 3(A) is a partially enlarged view of Fig. 1 in which the contact portion between the valve body 11 and the guide member 12 is enlarged.

[0037] As shown in Fig. 3(A), an inner peripheral expanded diameter portion 11d is formed in the opening 11a of the valve body 11. The inner peripheral expanded diameter portion 11d is a portion for forming a burr accommodation space S (space) between the press-fit portion 1213 and a sealing surface 1213a described later, and is formed with a larger diameter toward the outer side X2 than the inner peripheral surface 11c of the valve body 11. In the cross-sectional view shown in Fig. 3(A), the inner peripheral expanded diameter portion 11d has a first surface portion 11d1 extending from the end surface 11b of the opening 11a of the valve body 11 in the axis L direction, and a second surface portion 11d2 extending from the first surface portion 11d1 toward the inner side X1 and continuing to the inner peripheral surface 11c of the valve body 11, and is formed into a stepped shape by the first surface portion 11d1 and the second surface portion 11d2. In this embodiment, the inner peripheral expanded diameter portion 11d is formed around the entire circumference of the opening 11a of the valve body 11. However, for example, the inner peripheral expanded diameter portion 11d may be formed only at the position where the press-fit portion 1213 is located (four locations in this embodiment).

[0038] The press-fit portion 1213 is formed with a contact surface 1213a that extends in the axial direction L from the contact surface 122a (position in contact with the fixed member 122) of the fixed member 122 and comes into close contact with the inner peripheral surface 11c of the valve body 11, and an inclined surface 1213b that is continuous with the contact surface 1213a and is inclined inward X1 with respect to the axial direction L. A burr accommodating space S is formed between the contact surface 1213a and the first surface portion 11d1, i.e., between the contact surface 1213a and the inner peripheral expanded diameter portion 11d.

[0039] 3(A), the length A1 of the first surface 11d1 of the valve body 11 in the axial direction L is set to be smaller than the length A2 of the close contact surface 1213a in the axial direction L. The diameter of the portion where the close contact surface 1213a is formed in the press-fitted portion 1213 before being press-fitted into the opening 11a of the valve body 11 is set to be slightly larger than the inner diameter of the inner circumferential surface 11c of the valve body 11. The maximum diameter of the portion where the inclined surface 1213b is formed in the press-fitted portion 1213 before being press-fitted into the opening 11a of the valve body 11 is set to be the same as the diameter of the portion where the close contact surface 1213a is formed in the press-fitted portion 1213.

[0040] In addition, in the cross-sectional view shown in Figure 3(A) (cross-sectional view of a vertical cross section cut along the axis L direction of the portion including the press-fit portion 1213), the radial width dimension A3 of the contact portion of the abutment surface 122a of the fixing member 122 that contacts the end face 11b of the opening 11a of the valve body 11 is set to be larger than the radial width dimension A4 of the opening of the burr accommodating space S in the radial direction X.

[0041] Next, the assembly of the guide member 12 to the valve body 11 will be described. When the guide member 12 is assembled to the valve body 11, the press-fit portion 1213 of the guide member 12 is pressed into the opening 11a of the valve body 11 in the direction of the axis L and press-fitted. When the press-fit portion 1213 is press-fitted, the inclined surface 1213b slides against the inner peripheral surface 11c of the valve body 11 and functions as a guide while the press-fit portion 1213 moves to the other side L2 in the direction of the axis L.

[0042] As the press-fitting progresses, the inclined surface 1213b is followed by the contact surface 1213a which starts to slide against the inner circumferential surface 11c of the valve body 11. At this time, the contact surface 1213a is deformed inwardly X1, and a force which tries to return the contact surface 1213a to its original shape before deformation is applied to the inner circumferential surface 11c of the valve body 11. As a result, the guide member 12 is supported by the valve body 11. This press-fitting is continued until the contact surface 122a of the fixing member 122 comes into contact with the end surface 11b of the opening 11a of the valve body 11. Thereafter, the contact surface 122a of the fixing member 122 and the end surface 11b of the opening 11a of the valve body 11 are fixed to each other by welding or the like.

[0043] In this case, since the diameter dimension of the press-fit portion 1213 is larger than the inner diameter dimension of the inner peripheral surface 11c of the valve body 11, the inner peripheral surface 11c of the metal valve body 11 may scrape the resin contact surface 1213a, generating burrs B, as shown in Fig. 3(B). However, the burrs B are contained in the burr containing space S, and are prevented from affecting the contact state of the contact surface 1213a of the press-fit portion 1213, the attitude of the press-fit portion 1213, and the like. Furthermore, as described above, the length dimension A1 of the first surface portion 11d1 in the axial direction L is set to be smaller than the length dimension A2 of the sealing surface 1213a in the axial direction L. Therefore, even when the press-fit portion 1213 is pressed in, the sealing surface 1213a extends in the axial direction L beyond the end of the other side L2 of the first surface portion 11d1, and the sealing surface 1213a is reliably in contact with the inner surface 11c of the valve body 11 which is continuous with the second surface portion 11d2.

[0044] In the cross-sectional view of FIG. 3(B), when the maximum amount of burrs B generated as described above is expressed by an area, the area can be expressed by the following formula.

[0045] (Formula) Maximum amount of burr B generated (mm 2 )=((Maximum diameter dimension (mm) of the press-fit portion 1213-Inner diameter dimension (mm) of the inner circumferential surface 11c of the valve body 11)×(Length dimension A2 (mm) of the contact surface 1213a in the axial direction L-Length dimension A1 (mm) of the first surface portion 11d1 in the axial direction L))÷2

[0046] Therefore, the size of the inner peripheral expanded diameter portion 11d can be determined by estimating the amount of burrs B to be generated from the dimensional ratio between the inner diameter of the inner peripheral surface 11c of the valve body 11 and the maximum diameter of the press-fit portion 1213, and the dimensional ratio between the length dimension A1 and the length dimension A2, etc. The shape of the generated burrs is not limited to a flat thin plate, and may be curled, twisted, etc., so that the area of ​​the burrs B in the cross-sectional view of FIG. 3(B) becomes larger. Therefore, it is preferable to set the size of the inner peripheral expanded diameter portion 11d (particularly the width dimension in the radial direction X of the inner peripheral expanded diameter portion 11d) to about 1.5 to 3.0 times the size of the generated burrs B.

[0047] Furthermore, the size of the inner peripheral expanded diameter portion 11d may be set simply based on the width dimension in the radial direction X of the end face 11b of the opening 11a of the valve body 11. For example, the length dimension in the radial direction X of the second surface portion 11d2 may be set to about 3.0% to 25.0% of the width dimension in the radial direction X of the end face 11b, and the length dimension A1 in the axial direction L of the first surface portion 11d1 may be set to about 10.0% to 35.0% of the width dimension in the radial direction X of the end face 11b.

[0048] As described above, according to this embodiment, even if the press-fit portion 1213 is scraped off and a burr B is generated when the press-fit portion 1213 is press-fitted into the opening 11a of the valve body 11, a burr accommodation space S (space) is formed between the inner peripheral expanded diameter portion 11d of the valve body 11 and the close contact surface 1213a of the press-fit portion 1213, and the burr B can be accommodated in this burr accommodation space S. Therefore, it is possible to suppress the burr B being sandwiched between the end face 11b (opening edge) of the valve body 11 and the fixing member 122, which causes the fixing member 122 to be fixed in a state inclined from the axis L direction (press-fitting direction) relative to the valve body 11, thereby inhibiting the operability of the motor-operated valve 1. Therefore, it is possible to provide a motor-operated valve 1 in which the guide member 12 can be fixed to the valve body 11 while maintaining good operability.

[0049] In addition, since the press-fit portion 1213 extends in the axial direction L from the position where it contacts the fixed member 122, the fixed member 122 can receive the stress generated in the press-fit portion 1213 when the guide member 12 is fixed. Therefore, deformation and damage of the guide member 12 can be suppressed. In addition, the inclined surface 1213b of the press-fit portion 1213 functions as a guide for the press-fit portion 1213 when it is in sliding contact with the inner peripheral surface 11c of the valve body 11, so that the assembly of the guide member 12 can be made easier and the assembly cost of the motor-operated valve 1 can be reduced compared to a configuration without the inclined surface 1213b. In addition, by providing the inclined surface 1213b to the press-fit portion 1213, the contact area between the press-fit portion 1213 and the inner peripheral surface 11c of the valve body 11 can be reduced, so that the generation of burrs B can be further suppressed.

[0050] Furthermore, since the inner peripheral expansion portion 11d is composed of the first surface portion 11d1 and the second surface portion 11d2, the burr storage space S having a stepped surface composed of the first surface portion 11d1 and the second surface portion 11d2 can store burrs B generated when the press-fit portion 1213 is scraped.

[0051] Further, the length dimension A1 in the axial direction of the first surface portion 11d1 is set to be smaller than the length dimension A2 in the axial direction of the contact surface 1213a of the press-fit portion 1213. Therefore, even when the press-fit portion 1213 is press-fitted, the contact surface 1213a extends in the axial direction beyond the end of the other side L2 of the first surface portion 11d1, and the contact surface 1213a can be reliably brought into contact with the inner circumferential surface 11c of the valve body 11 that is continuous with the second surface portion 11d2.

[0052] As described above, in a cross-sectional view in the axial direction L including the press-fit portion 1213, the width dimension A3 (length dimension) in the radial direction X of the contact portion between the end face 11b of the opening 11a and the abutment surface 122a of the fixing member 122 is larger than the width dimension A4 (length dimension) in the radial direction X of the opening of the burr accommodation space S. Therefore, the fixing member 122 that contacts the valve body 11 with a contact width larger than the width dimension of the opening of the burr accommodation space S at a position of the press-fit portion 1213 can be reliably fixed to the valve body 11 by welding or the like, thereby improving the stability when the guide member 12 is fixed to the valve body 11. Furthermore, by improving the stability of the guide member 12 fixed to the valve body 11, the inclination of the guide member 12 with respect to the valve body 11 is suppressed, and the concentricity of the guide member 12 can be improved.

[0053] In this way, a refrigeration cycle system can be configured by using the motor-operated valve 1, in which the guide member 12 can be fixed to the valve body 11 while maintaining good operability, as the expansion valve 100.

[0054] The above describes in detail the embodiments of the motor-operated valve 1 with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the present invention includes design changes and the like that do not deviate from the gist of the present invention.

[0055] FIG. 4(A) is a partial enlarged view of the contact portion between the valve body 11 and the guide member 12 in the first modified example. In the first modified example, an inner peripheral expanded diameter portion 21d is formed at the opening 11a of the valve body 11. The inner peripheral expanded diameter portion 21d includes a first surface portion 21d1 and a second surface portion 21d2. The inner peripheral expanded diameter portion 21d, the first surface portion 21d1, and the second surface portion 21d2 correspond to the inner peripheral expanded diameter portion 11d, the first surface portion 11d1, and the second surface portion 11d2 in the above-mentioned embodiment, respectively. This modified example differs from the above-mentioned embodiment in that the dimension of the first surface portion 21d1 in the axis L direction and the dimension of the second surface portion 21d2 in the radial direction X are approximately equal. According to this configuration, it is possible to provide an electric valve 1 that can fix the guide member 12 to the valve body 11 while maintaining good operability, as in the above-mentioned embodiment.

[0056] Fig. 4(B) is a partially enlarged view of the contact portion between the valve body 11 and the guide member 12 in the second modified example. In the second modified example, an inner circumferential expanded diameter portion 31d is formed at the opening 11a of the valve body 11. The inner circumferential expanded diameter portion 31d corresponds to the inner circumferential expanded diameter portion 11d and the inner circumferential expanded diameter portion 21d described above. In the cross-sectional view shown in Fig. 4(B), the inner circumferential expanded diameter portion 31d includes a tapered surface portion 31d1 that extends from the end face 11b of the opening 11a of the valve body 11 toward the inner side X1 at an angle with respect to the axis L direction, and a curved surface portion 31d2 that curves from the inner circumferential surface 11c of the valve body 11 toward the outer side X2 and one side L1 (the end face 11b side).

[0057] This configuration provides the same effects and advantages as the above-described embodiment and the first modified example. In addition, when the press-fit portion 1213 is press-fitted into the opening 11a, the tapered surface portion 31d1 of the inner peripheral expanded portion 31d slides against the outer peripheral surface of the press-fit portion 1213, i.e., the close contact surface 1213a and the inclined surface 1213b, and functions as a guide for the press-fit portion 1213. This makes it easier to assemble the guide member 12 and reduces the assembly cost of the motor-operated valve 1 compared to a configuration without the tapered surface portion 31d1.

[0058] In addition, by forming the curved portion 31d2, the number of corners between the inner peripheral expansion portion 31d and the inner surface 11c of the valve body 11 is reduced, thereby further suppressing the generation of burrs B when the press-fit portion 1213 hits the inner peripheral expansion portion 31d.

[0059] In the second modification, the inner circumferential expanded portion 31d is provided with both the tapered surface portion 31d1 and the curved surface portion 31d2, but the configuration of the inner circumferential expanded portion 31d is not limited to this. For example, the inner circumferential expanded portion 31d may be provided with either the tapered surface portion 31d1 or the curved surface portion 31d2. That is, it is sufficient that the inner circumferential expanded portion 31d has at least one of the tapered surface portion 31d1 and the curved surface portion 31d2.

[0060] FIG. 6 is a bottom view of the guide member 12 in the third modified example as viewed from the axis L direction. In the third modified example, a press-fit portion 2213 is formed in the large diameter portion 1212 of the guide member main body 121. The press-fit portion 2213 corresponds to the press-fit portion 1213 in the above-mentioned embodiment and modified example. As shown in FIG. 6, four press-fit portions 2213 are formed at equal intervals in the circumferential direction of the large diameter portion 1212, each of which protrudes outward in the radial direction X from the outer circumferential surface of the large diameter portion 1212 and extends in the axis L direction to be formed in a columnar shape. As shown in FIG. 6, the press-fit portion 2213 is formed in a substantially rectangular shape in a bottom view, and the flat surface constituting the protruding end portion is a contact surface 2213a. Curved surfaces are connected to both ends of the contact surface 2213a in a bottom view. As with the above-mentioned embodiments and modified examples, the number of press-fit portions 2213 may be four or less, or may be four or more, and from the viewpoint of maintaining the concentricity of the valve body 11 and the guide member 12, it is preferable to provide at least three or more.

[0061] According to this configuration, since the contact surface 2213a is flat and not arc-shaped, when the press-fit portion 2213 is pressed in, the contact area of ​​the press-fit portion 2213 with the valve body 11 can be made smaller than in a configuration having an arc-shaped contact surface 1213a. This makes it possible to further suppress the occurrence of burrs B.

[0062] In the above-mentioned embodiment, the first modified example, the second modified example, and the third modified example, the valve body 11 is integrally formed in a cylindrical shape with the side wall 111 to which the first joint pipe 15 is fixed and the bottom wall 112 to which the second joint pipe 16 is fixed, and the guide member 12 and the case 141 are fixed to the opening 11a by welding or the like. However, the configuration of the valve body 11, the guide member 12, and the case 141 is not limited to this, and the valve body 11 may be formed by combining a plurality of cylindrical parts. That is, the valve body 11 may be formed by integrally having the side wall 111 to which the first joint pipe 15 is fixed and the bottom wall 112 to which the second joint pipe 16 is fixed, and fixing another cylindrical part to the opening end of the cylindrical part that constitutes the valve chamber 11A inside, and fixing the guide member 12 and the case 141 to the opening of the other cylindrical part.

[0063] In the above-described embodiment, the first modified example, the second modified example, and the third modified example, the valve body 13 has the following configuration. That is, the valve body portion 131 is held on the other side L2 of the valve holder 132, and the rotor shaft 143 is provided on one side L1 of the valve holder 132 so as to be movable forward and backward inside the valve holder 132, whereby the valve holder 132 is provided on the other side L2 of the rotor shaft 143. However, the configuration of the valve body 13 is not limited to this. That is, the rotor shaft 143 may be integrally fixed to the one side L1 of the valve holder 132 by means of welding, crimping, press-fitting, or the like, a shaft portion extending to the other side L2 is formed in the valve body portion 131, and the shaft portion of the valve body portion 131 may be provided inside the valve holder 132 so as to be movable forward and backward, thereby providing the valve holder 132 on the other side L2 of the rotor shaft 143. Alternatively, both the rotor shaft 143 and the valve body portion 131 may be provided inside the valve holder 132 so as to be movable forward and backward, so that the valve holder 132 is provided on the other side L2 of the rotor shaft 143.

[0064] 1, 3(A), 3(B), and 4(B), the dimension of the burr accommodating space S in the axial direction L is set to be larger than the dimension of the burr accommodating space S in the radial direction X. With this configuration, the volume of the burr accommodating space S can be increased while maintaining the contact area between the abutment surface 122a of the fixing member 122 and the end face 11b. [Explanation of symbols]

[0065] 1 Motor-operated valve 11 Valve body 11a opening 11b End face 11c Inner surface 11d Inner circumference expansion part 11A Valve chamber 112a Valve port 12 Guide member 121 Guide member body 1213 Press-fit part 1213a Close contact surface 1213b Slope 122 Fixing member 13 Valve body L axis S Burr storage space (space) X radial direction X1 Inner side (radial inner side) X2 Outside (radially outside)

Claims

1. An electrically operated valve including a cylindrical valve body, a valve element that variably adjusts an opening area of ​​a valve port provided in the valve body, and a guide member that is fixed to the valve body and guides the valve element, the valve body has an opening that opens to a side opposite the valve port; The guide member has a resin guide member body and a metal fixing member fixed to the guide member body, the fixing member being fixed to an end surface of the opening of the valve body, the guide member main body has a press-fit portion that is press-fitted into the opening of the valve body in the axial direction, the press-fit portion having a contact surface that extends in the axial direction from a position in contact with the fixing member and contacts an inner circumferential surface of the valve body, and an inclined surface that is continuous with the contact surface and inclined radially inward, The opening of the valve body is provided with an inner peripheral expanded portion that is expanded radially outward from the inner peripheral surface to form a space between the inner peripheral surface and the sealing surface, In a cross-sectional view including the press-fit portion, a radial length dimension of a contact portion between the end surface of the opening and the fixing member is larger than a radial length dimension of an opening between the close contact surface and the inner peripheral expanded diameter portion, The inner peripheral expansion portion is formed in a stepped shape having a first surface portion extending in the axial direction from the end face of the opening portion and a second surface portion extending radially inward from the first surface portion and continuing to the inner peripheral surface, in a cross-sectional view; The motor-operated valve is characterized in that a burr storage space for storing burrs generated from the sealing surface is formed between the inner peripheral enlarged portion and the sealing surface.

2. The motor-operated valve according to claim 1, wherein a length dimension in the axial direction of the first surface portion is smaller than a length dimension in the axial direction of the sealing surface of the press-fit portion.

3. 3. A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the motor-operated valve according to claim 1 or 2 is used as the expansion valve.

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