Slide-type switching valve

Abstract

To provide a slide type switching valve for improving adhesion strength between a resin valve body and a metal member connecting the valve body and a sleeve, while easily securing airtightness inside the valve body.SOLUTION: A slide type switching valve 100 includes a cylindrical valve body 1, a metal cylindrical sleeve 51 arranged on one end side in an axis L direction of the valve body 1, and a connection part 2 connecting the opening edge of the sleeve 51 and the opening edge of the valve body 1, the connection part 2 including a cylindrical insert portion 21A insert-molded in the valve body 1 in the axis L direction. On the peripheral face of the insert portion 21A, there are provided a first contact part S1 contacting the resin inside of the valve body 1 in the direction that force against force to remove the connection part 2 is applied in the axis L direction, and a second contact part S2 contacting the resin inside of the valve body 1 in a radial direction X of the valve body 1.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a slide type switching valve.

Background Art

[0002] Conventionally, as a slide type switching valve used in a refrigeration cycle or the like, a four-way valve for switching a fluid flow path is known (see, for example, Patent Document 1). The four-way valve described in Patent Document 1 includes a cylindrical valve box (hereinafter referred to as a valve body) that forms a valve chamber inside, a circular connection plate in a plan view fixed to the opening edge of the valve body, and a non-magnetic sleeve fixed via the connection plate. A coil and a yoke of a magnetic material are provided on the outer periphery of the sleeve, and a part of the drive unit is constituted.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the slide type switching valve as described in Patent Document 1, while the valve body is formed of a resin material, the sleeve and the connection plate may be formed of metal. In this case, it is conceivable to fix the connection plate to the valve body by insert molding and connect the valve body and the sleeve via this connection plate. However, since the inside of the valve body is at a higher pressure than the outside due to the high-pressure refrigerant, a force is applied outward to the inner surface of the valve body due to the pressure difference. Depending on the direction in which this force acts, there was a risk that the contact surface where the connection plate and the resin inside of the valve body come into contact with each other would peel off. Therefore, it is difficult to ensure the adhesion between the resin component valve body and the metal component connection plate, and it is difficult to maintain the airtightness inside the valve body.

[0005] The objective of the present invention is to provide a slide-type switching valve that improves the airtightness inside the valve body by improving the adhesion strength between the resin valve body and the metal member connecting the valve body and the sleeve. [Means for solving the problem]

[0006] To solve the aforementioned problems and achieve the objective, the slide-type switching valve of the present invention comprises a cylindrical valve body, a cylindrical metal sleeve disposed on one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve and the open end edge of the valve body, wherein the connecting portion comprises a cylindrical insert portion insert-molded axially with respect to the valve body, and the circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied resisting the force that pulls the connecting portion out in the axial direction, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body. Furthermore, the circumferential surface of the insert portion is provided with a third contact portion that contacts the resin interior of the valve body in the circumferential direction of the valve body, and the circumferential surface of the insert portion is provided with at least one of a recess, a protrusion, and a through hole, and the first contact portion and the third contact portion are formed by at least one of the recess, protrusion, and through hole provided in the insert portion. It is characterized by being present.

[0007] According to the present invention, the valve body is provided with a cylindrical insert portion that is insert-molded in the axial direction, and the insert portion is provided with a first contact portion and a second contact portion. Because the insert portion is insert-molded in the axial direction, the contact area with the inside of the resin of the valve body can be increased in the axial direction. Furthermore, the first contact portion and the second contact portion allow the insert portion to contact the inside of the resin of the valve body in both the direction in which a force is applied to resist the force that pulls the connection portion out in the axial direction, and in the radial direction of the valve body, thereby suppressing the reduction of the mechanical catching effect (hereinafter also referred to as the anchoring effect) caused by chemical bonding force or fine irregularities at the contact surface. For this reason, it is possible to prevent the separation of the contact surface when a force is applied outward to the inner surface of the valve body due to the pressure difference between the inside and outside of the valve body. Thus, it is possible to obtain a slide-type switching valve that improves the adhesion strength between the resin valve body and the metal member connecting the valve body and the sleeve, and makes it easier to ensure airtightness inside the valve body. Furthermore, with this configuration, at least one of a recess, a protrusion, and a through hole is provided on the circumferential surface of the insert portion, and at least one of the recess, protrusion, and through hole provided on the insert portion constitutes a first contact portion and a third contact portion.

[0008] Also, Preferably, the first contact portion and the third contact portion are provided in multiple locations at equal intervals in the circumferential direction. With this configuration, the force applied to the inner surface of the valve body can be received by the multiple first contact portions and third contact portions provided at equal intervals in the circumferential direction of the cylindrical insert portion, thereby distributing the force evenly. This prevents the valve body and the connection portion from separating due to the concentration of stress or other forces at a specific location.

[0009] Also, Preferably, the sum of the maximum lengths of the first contact portions in the circumferential direction is less than half the circumferential length of the insert portion. With this configuration, the sum of the maximum lengths of the first contact portions in the circumferential direction is kept to less than half the circumferential length of the insert portion, so that the volume of the insert portion can be secured and the reduction in strength of the insert portion due to the provision of the first contact portions can be suppressed.

[0013] Also, The valve comprises a cylindrical valve body, a cylindrical metal sleeve positioned at one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve to the open end edge of the valve body. The connecting portion includes a cylindrical insert portion that is insert-molded axially with respect to the valve body. The circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied resisting the force that would cause the connecting portion to detach in the axial direction, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body. Preferably, the first contact portion and the second contact portion are provided in multiple locations at equal intervals in the circumferential direction of the valve body. With this configuration, the force applied to the inner surface of the valve body can be received by the multiple first and second contact portions provided at equal intervals in the circumferential direction of the cylindrical insert portion, thereby distributing the force evenly. This prevents the valve body and the connection portion from separating due to the concentration of stress or other forces at a specific location.

[0016] Also, The valve comprises a cylindrical valve body, a cylindrical metal sleeve positioned at one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve to the open end edge of the valve body. The connecting portion includes a cylindrical insert portion that is insert-molded axially with respect to the valve body. The circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied resisting the force that would cause the connecting portion to detach in the axial direction, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body. Preferably, the insert portion comprises a first insert portion extending in the axial direction and a second insert portion extending radially outward from one end of the first insert portion in the axial direction, and the connecting portion comprises the insert portion, a connecting portion extending radially outward from the second insert portion and exposed from the valve body, and a plate portion extending axially along the side surface of the valve body and continuous with the outer edge of the connecting portion, with its inner surface facing the inside of the valve body. With such a configuration, the aforementioned force applied to the inner surface of the valve body can be received by the connecting portion exposed from the valve body and the plate portion. That is, the outer edge can be used as the starting point for deformation of the plate portion. Therefore, it is possible to prevent the force from reaching the insert portion, thereby preventing the contact surface between the insert portion and the resin interior of the valve body from peeling off. Consequently, the airtightness between the valve body and the connecting portion can be further improved. Furthermore, the connection portion comprises a cylindrical upper cover connected to the sleeve and a lower cover connected to the upper cover, the lower cover comprising the insert portion, the connecting portion and the plate portion, and preferably the upper cover and the lower cover are integrated as a welded portion where one end of the upper cover in the axial direction and one end of the plate portion in the axial direction are welded together. With such a configuration, the upper cover and the lower cover are integrated by welding one end of the upper cover in the axial direction and one end of the plate portion in the axial direction together. In other words, the welded portion is formed between the plate portion, which is not the insert portion embedded in the valve body, and the end of the upper cover, so the effect of welding heat during welding is less likely to extend to the portion of the connection portion that is embedded in the valve body. Therefore, expansion and contraction of the valve body due to welding heat can be suppressed, and thereby separation between the valve body and the connection portion can be suppressed.

[0017] Also, The valve comprises a cylindrical valve body, a cylindrical metal sleeve positioned at one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve to the open end edge of the valve body. The connecting portion includes a cylindrical insert portion that is insert-molded axially with respect to the valve body. The circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied resisting the force that would cause the connecting portion to detach in the axial direction, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body.Preferably, the insert portion is provided with a folded portion that bends in the radial direction, and the first contact portion, the second contact portion, and the folded portion are arranged at different positions in the axial direction. With this configuration, the folded portion, the first contact portion, and the second contact portion, which are arranged at different positions in the axial direction, can receive the force applied to the inner surface of the valve body as described above, thus distributing the force. Therefore, it is possible to prevent the valve body and the connection portion from separating due to the concentration of stress or the like at a specific location.

[0018] Also, The valve comprises a cylindrical valve body, a cylindrical metal sleeve positioned at one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve to the open end edge of the valve body. The connecting portion includes a cylindrical insert portion that is insert-molded axially with respect to the valve body. The circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied resisting the force that would cause the connecting portion to detach in the axial direction, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body. Preferably, the circumferential surface of the insert portion has an uneven, rough surface. With this configuration, the resin of the valve body can fill the gaps in the rough surface formed on the circumferential surface of the insert portion, thereby increasing the contact area between the valve body and the connection portion, and thus improving the airtightness between the valve body and the connection portion. [Effects of the Invention]

[0020] According to the present invention, it is possible to obtain a slide-type switching valve that improves the airtightness inside the valve body by improving the airtightness between the resin valve body and the metal member connecting the valve body and the sleeve. [Brief explanation of the drawing]

[0021] [Figure 1] A schematic diagram showing the state of a refrigeration cycle system during cooling, using a slide-type switching valve according to one embodiment of the present invention as a flow path switching valve. [Figure 2] A schematic diagram showing the state of the aforementioned refrigeration cycle system during heating. [Figure 3] Enlarged cross-sectional view of the main part of the aforementioned sliding type switching valve. [Figure 4] Enlarged view of area B in Figure 3. [Figure 5] Enlarged view of region C in Figure 4. [Figure 6] Cross-sectional view taken along line AA in Figure 3. [Figure 7](A) is a side view of the connection part, and (B) is a cross-sectional view taken along the arrow D-D line in Fig. 7(A). [Figure 8] (A) to (C) are longitudinal sectional views showing variations of the connection part in the second embodiment. [Figure 9] Longitudinal sectional view of the connection part in the third embodiment.

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described based on Figs. 1 to 7. As shown in Fig. 1, the slide type switching valve 100 according to the present embodiment is connected to a compressor 200, an outdoor heat exchanger 300, and an indoor heat exchanger 500 in a refrigeration cycle or the like, and is a switching valve that switches the flow path of the refrigerant flowing through these devices. The slide type switching valve 100 includes a cylindrical valve body 1, a connection part 2 fixed to the opening edge of the valve body 1, a valve seat part 3 fixed inside the valve body 1, a valve body 4 provided slidably in the axial direction L inside the valve body 1, and a drive part 5 that slidably drives the valve body 4.

[0023] In the description of the present embodiment, the side with the sleeve 51 of the drive part 5 described later in the axial direction L of the valve body 1 is taken as one side in the axial direction L, and the opposite side to one side in the axial direction L is taken as the other side in the axial direction L. Further, one side in the axial direction L may be denoted as one side L1, and the other side in the axial direction L may be denoted as the other side L2. Further, the direction orthogonal to the axial direction L is taken as the radial direction, and the direction around the axis L is taken as the circumferential direction. The radial direction may be denoted as the radial direction X, and the circumferential direction may be denoted as the circumferential direction Y.

[0024] As shown in Figure 1, the valve body 1 comprises a circular bottom wall 10 and a side wall 11 extending from the periphery of the bottom wall 10 to one side L1, and is formed in a bottomed cylindrical shape (i.e., cylindrical shape) by resin molding using polyphenylene sulfide (PPS) or the like as the material. The inside of the valve body 1 constitutes a valve chamber 1a. A D port 1d is formed in the bottom wall 10, communicating with the inside and outside of the valve chamber 1a. The D port 1d communicates with the discharge hole of the compressor 200 via a D connecting passage 1d1 extending in the axial direction L, a D connecting passage 6d (described later), and a D joint pipe 1d2.

[0025] On the side wall 11, multiple passages communicating with the inside and outside of the valve chamber 1a are formed in this order along the axis L direction from one side L1: an E connection passage 1e, an S connection passage 1s, and a C connection passage 1c. The E connection passage 1e communicates with the indoor heat exchanger 500 (evaporator or condenser) via the E switching port 3e, the E connecting passage 6e, and the E joint pipe 1e1, which will be described later. The S connection passage 1s communicates with the intake port of the compressor 200 via the S port 3s, the S connecting passage 6s, and the S joint pipe 1s1, which will be described later. The C connection passage 1c communicates with the outdoor heat exchanger 300 (condenser or evaporator) via the C switching port 3c, the C connecting passage 6c, and the C joint pipe 1c1, which will be described later.

[0026] In this embodiment, the E connection channel 1e is connected to the indoor heat exchanger 500 via the E switching port 3e, the E connecting passage 6e, and the E joint pipe 1e1, and communicates with the indoor heat exchanger 500, while the C connection channel 1c is connected to the outdoor heat exchanger 300 via the C switching port 3c, the C connecting passage 6c, and the C joint pipe 1c1, and communicates with the outdoor heat exchanger 300. However, the connections of the E connection channel 1e and the C connection channel 1c may be reversed. That is, the E connection channel 1e may be connected to the outdoor heat exchanger 300, and the C connection channel 1c may be connected to the indoor heat exchanger 500.

[0027] The connecting part 2 is a metal component that connects the valve body 1 and the sleeve 51, which will be described later, and is fixed to the open end edge L1 of one side of the valve body 1 by insert molding. The connecting part 2 comprises a substantially cylindrical upper cover 20 and a substantially cylindrical lower cover 21 connected to the upper cover 20. The open end edge L1 of one side of the upper cover 20 is welded to the open end edge L2 of the other side of the sleeve 51. The open end edge L2 of the upper cover 20 is formed to expand in diameter in the radial direction X.

[0028] The lower cover 21 comprises an insert portion 21A that is insert-molded in the axial direction L relative to the valve body 1 (i.e., embedded in the valve body 1), a connecting portion 21B that extends radially outward X, continuous with the insert portion 21A, and is exposed from the valve body 1, a plate portion 21C that extends in the axial direction L along the side surface of the valve body 1, continuous with the outer end edge of the connecting portion 21B, and whose inner surface faces the inside of the valve body 1, and a folded portion 21D formed at the other end L2 of the insert portion 21A.

[0029] As shown in Figure 4, the upper cover 20 and the lower cover 21 are integrally connected by a welded joint W formed by welding the opening edge L2 on the other side of the upper cover 20 (one end in the direction of the axis L of the upper cover 20) and the opening edge L1 on one side of the plate portion 21C of the lower cover 21 (one end in the direction of the axis L of the plate portion 21C).

[0030] The valve body 1 and connection part 2 formed in this manner are housed in a housing 6, as shown in Figures 1 and 2. The housing 6 has a housing hole 6a in its center that is coaxial with the axis L and has an inner diameter larger than the outer diameter of the valve body 1, and the valve body 1 and connection part 2 are inserted into this housing hole 6a in the direction of the axis L. A D-connection passage 6d is formed in the bottom wall of the housing 6, which communicates with the D port 1d and the D connection passage 1d1 described above. A D-connection pipe 1d2 is installed in the D-connection passage 6d. Multiple communication passages are formed in the side wall of the housing 6, which communicate with the E connection passage 1e, S connection passage 1s, and C connection passage 1c described above, respectively, as E-connection passage 6e, S-connection passage 6s, and C-connection passage 6c, in this order from one side L1 along the direction of the axis L. The destinations of each communication passage 6e, 6s, and 6c are as described above, so their explanation is omitted.

[0031] In Figures 1 and 2, reference numeral G denotes grooves formed at predetermined intervals along the axis L on either the outer circumferential wall of the valve body 1 or the inner circumferential wall of the housing hole 6a, and reference numeral 7 denotes a sealing member such as an O-ring placed in the groove G. Reference numeral 8 denotes a retaining ring that abuts against the upper cover 20 and restricts the movement of the valve body 1 to one side L1.

[0032] As shown in Figure 3, the valve seat portion 3 is a component installed on the side wall of the valve body 1, where the E connection passage 1e, S connection passage 1s, and C connection passage 1c are formed. This valve seat portion 3 is made of a thin metal plate and is fixed to the side wall of the valve body 1 by insert molding, bonding, welding, etc. On the plate surface of the valve seat portion 3, an E switching port 3e communicating with the E connection passage 1e, an S port 3s communicating with the S connection passage 1s, and a C switching port 3c communicating with the C connection passage 1c are each formed penetrating in the thickness direction of the plate. Of the plate surface of the valve seat portion 3, the surface facing radially inward X constitutes a sealing surface 30 that slides against the sealing portion 40b of the valve body 4, which will be described later.

[0033] The valve body 4 is mainly made of a resin such as polyphenylene sulfide (PPS) and is slidably mounted inside the valve body 1 in the axial direction L. This valve body 4 is configured to switch the communication state of the D port 1d, E switching port 3e, S port 3s, and C switching port 3c, and in this embodiment, it is configured to include a valve body 40 that slides against the sealing surface 30 of the valve seat 3. This valve body 40 is formed in a bowl shape that opens toward the sealing surface 30, and its interior forms a bowl-shaped recess 40a that serves as a fluid passage. The opening edge of the valve body 40 is a sealing portion 40b that slides against the sealing surface 30, and its axial direction L and width are set to be large enough to cover two adjacent ports among the E switching port 3e, S port 3s, and C switching port 3c.

[0034] A hook portion 41 is formed at one end L1 of the valve body 40, protruding from the one end L1 and opening radially in the direction X on the side opposite to the side with the valve seat portion 3. The hook portion 41 is the part for connecting the valve body 4 to the drive unit 5, and is fixed to the drive unit 5 by a fixing pin 58c positioned on the hook-shaped portion, sandwiched radially from X by two connecting arms 58b of the female thread member 58 of the drive unit 5 (described later), and by a metal clip 58d that surrounds and tightens the connecting arms 58b and the hook portion 41 in the circumferential direction Y.

[0035] A stopper 42 is formed at the other end L2 of the valve body 40, projecting in the axial direction L toward the D port 1d. The stopper 42 restricts the movement of the valve body 40 toward the other L2 by its projecting end contacting the surface 10a on the valve chamber 1a side of the bottom wall 10 of the valve body 1.

[0036] A biasing member 43 is installed between the tip surface of the top of the valve body 40 and the inner circumferential surface of the valve body 1, biasing the valve body 4 toward the valve seat portion 3. The biasing member 43 is a leaf spring formed by press working or the like using a metal material such as phosphor bronze. By being biased by this biasing member 43, the sealing portion 40b of the valve body 40 is pressed against the sealing surface 30, thereby suppressing valve leakage.

[0037] The drive unit 5 is the part that slides the valve body 4 and includes a stepping motor 50 and a linear motion mechanism 54 that converts the rotation of the stepping motor 50 into linear motion and transmits it to the valve body 4. As shown in Figure 1, the stepping motor 50 is fixed to the open end edge of one side L1 of the top cover 20 (located on one end in the direction of the axis L of the valve body 1) and includes a sleeve 51 that seals the inside of the drive unit 5, an electromagnetic rotor 52 built into the sleeve 51, and an electromagnetic coil 53 that surrounds the outer circumference of the electromagnetic rotor 52 in the circumferential direction Y with the sleeve 51 in between. The sleeve 51 is formed in a bottomed cylindrical shape using a thin plate-like metal material, and is positioned so that its central axis is coaxial with the axis L and its open end edge faces the other side L2, and its open end edge is welded and fixed to the open end edge of one side L1 of the top cover 20.

[0038] The linear motion mechanism 54 comprises a bearing member 55 positioned inside one side L1 of the sleeve 51, a guide member 56 fixed to the inner circumferential wall of the upper cover 20, a male screw 57 as a drive shaft fixed to the center of the electromagnetic rotor 52, and a female screw member 58 having a female screw portion 58a1 that screws into the male screw portion 57a ​​formed on the outer circumferential surface of the male screw 57. In other words, the linear motion mechanism 54 is configured as a screw feed mechanism having a male screw portion 57a ​​and a female screw portion 58a1 that screw into each other.

[0039] The bearing member 55 is a member that supports the male screw 57 so that it can rotate in the direction of the axis L, and is formed in a cylindrical shape. The bearing member 55 is inserted into the sleeve 51 so that its central axis is coaxial with the axis L of the valve body 1. At the center of the bearing member 55, which is the axial position of the male screw 57, a first bearing hole 55a is formed that opens toward the other side L2. One end L1 of the male screw 57 is fitted into the first bearing hole 55a.

[0040] The guide member 56 is formed in a bottomed cylindrical shape and is fixed to the inner circumferential wall of the top cover 20 such that its tip is located on one side L1 and its bottom is located on the other side L2. The guide member 56 is positioned so that its central axis is coaxial with the axis L of the valve body 1. With this arrangement, the sleeve 51, bearing member 55, and guide member 56 are all positioned so that their central axes are coaxial with the axis L of the valve body 1. A first bearing hole 55a and a second bearing hole 56a facing each other in the direction of the axis L are formed in the center of the guide member 56. The other end L2 of the male screw 57 is fitted into the second bearing hole 56a.

[0041] In the bottom wall of the guide member 56, a pair of guide holes (not shown) are formed around the second bearing hole 56a, through which the connecting arm portion 58b of the female screw member 58 (described later) can be inserted so as to move back and forth in the axial direction L. These guide holes are through-holes in the axial direction L that prevent the female screw member 58 from rotating around the axial direction L and guide it to move back and forth in the axial direction L.

[0042] The male screw 57 is fixed to the center of the electromagnetic rotor 52, extends in the direction of the axis L, and is configured to rotate integrally with the electromagnetic rotor 52 around the axis L. As described above, a male screw portion 57a ​​is formed on the outer circumferential surface of the male screw 57. In addition, one end L1 of the male screw 57 is fitted into the first bearing hole 55a, and the other end L2 of the male screw 57 is fitted into the second bearing hole 56a, thereby supporting the male screw 57 so that it can rotate around the axis L.

[0043] The female threaded member 58 comprises a cylindrical base end portion 58a housed within the guide member 56, the outer peripheral wall of which slides against the inner peripheral wall of the guide member 56, and two connecting arms 58b extending from the base end portion 58a to the other side L2 and into the valve chamber 1a through the aforementioned guide hole. The central axis of the base end portion 58a is coaxial with the central axis of the guide member 56. A female threaded portion 58a1 is formed at the center of the base end portion 58a along the axis L. The female threaded portion 58a1 is screwed into the male threaded portion 57a ​​and can move back and forth in the direction of the axis L coaxial with the central axis as the male thread 57 rotates. The connecting arms 58b extend from a part of the peripheral edge of the base end portion 58a through the guide hole to the valve chamber 1a. The tip of each connecting arm 58b has a plate surface that faces each other, and a fixing pin 58c is fixed to the tip where the plate surfaces face each other, passing through both plate surfaces in the thickness direction.

[0044] In this configuration, when the male screw 57 rotates around the axis L due to the drive of the stepping motor 50, the female screw member 58 moves in the direction of the axis L as it rotates. As a result, the valve body 4 fixed to the connecting arm 58b of the female screw member 58 also moves in the direction of the axis L as the female screw member 58 moves. For example, in the state shown in Figure 1, the E switching port 3e and the S port 3s are in communication through the bowl-shaped recess 40a of the valve body 40, and the D port 1d and the C switching port 3c are in communication outside the valve body 40. However, when the valve body 40 moves to the other side L2, as shown in Figure 2, the C switching port 3c and the S port 3s are in communication through the bowl-shaped recess 40a of the valve body 40, and the D port 1d and the E switching port 3e are in communication outside the valve body 40.

[0045] Next, a refrigeration cycle system using a slide-type switching valve 100 as a flow path switching valve will be described. Figures 1 and 2 show a refrigeration cycle system of an embodiment, and are examples of a refrigeration cycle system for an air conditioner. The air conditioner has a compressor 200, an outdoor heat exchanger 300 (condenser or evaporator), an expansion valve 400, an indoor heat exchanger 500 (evaporator or condenser), and a slide-type switching valve 100 as a flow path switching valve. Each of these elements is connected by conduits as shown in the figure, forming a heat pump type refrigeration cycle system.

[0046] The flow path of the refrigeration cycle system can be switched between two flow paths, cooling operation and heating operation, by driving the valve body 4 of the sliding diverter valve 100 as described above. During cooling operation as shown in Figure 1, the valve body 4 of the sliding diverter valve 100 moves to one side L1, and the valve body 40 connects the S port 3s to the E diverter port 3e and the D port 1d to the C diverter port 3c. As shown by the arrows in the figure, the refrigerant, as a fluid compressed by the compressor 200, flows into the D port 1d of the sliding diverter valve 100 and flows into the outdoor heat exchanger 300 from the C diverter port 3c, and the refrigerant flowing out of the outdoor heat exchanger 300 flows into the expansion valve 400. The refrigerant is then expanded in the expansion valve 400 and supplied to the indoor heat exchanger 500. The refrigerant flowing out of the indoor heat exchanger 500 flows from the E switching port 3e to the S port 3s via the sliding switching valve 100, and is then circulated from the S port 3s to the compressor 200.

[0047] During heating operation as shown in Figure 2, the valve body 4 of the sliding diverter valve 100 moves to the other side L2, and the valve body 40 connects the S port 3s to the C diverter port 3c and the D port 1d to the E diverter port 3e. As shown by the arrows in the figure, the refrigerant compressed by the compressor 200 flows into the D port 1d of the sliding diverter valve 100 and flows into the indoor heat exchanger 500 from the E diverter port 3e, and the refrigerant flowing out of the indoor heat exchanger 500 flows into the expansion valve 400. The refrigerant is then expanded in the expansion valve 400 and supplied to the outdoor heat exchanger 300. The refrigerant flowing out of the outdoor heat exchanger 300 flows from the C diverter port 3c to the S port 3s in the sliding diverter valve 100, and is circulated from the S port 3s back to the compressor 200.

[0048] Although not shown in the diagram, if the E connection channel 1e is connected to the outdoor heat exchanger 300 and the C connection channel 1c is connected to the indoor heat exchanger 500, as described above, the relationship between the position of the valve body 4 and the cooling and heating operations will be reversed compared to this embodiment. That is, in the sliding switching valve 100, when the valve body 4 moves to one side L1, and the S port 3s is connected to the E switching port 3e by the valve body 40, and the D port 1d is connected to the C switching port 3c, the refrigerant flows in the following order: compressor 200, C switching port 3c, indoor heat exchanger 500, expansion valve 400, outdoor heat exchanger 300, E switching port 3e, S port 3s, and compressor 200, resulting in heating operation. Conversely, in the sliding type switching valve 100, when the valve body 4 moves to the other side L2, and the valve body 40 connects the S port 3s to the C switching port 3c and the D port 1d to the E switching port 3e, the refrigerant flows in the following order: compressor 200, E switching port 3e, outdoor heat exchanger 300, expansion valve 400, indoor heat exchanger 500, C switching port 3c, S port 3S, and compressor 200, resulting in cooling operation.

[0049] In such a sliding type switching valve 100, high-pressure refrigerant flows into the valve chamber 1a via the D port 1d, causing the valve chamber 1a to become extremely high-pressure, and a pressure difference is likely to occur between the inside and outside of the valve chamber 1a. As a result, outward forces are easily applied to the inner surface of the valve body 1, and depending on the direction in which these forces act, shear forces or the like may act on the joint between the valve body 1 (resin) and the connecting part 2 (metal), which are made of different materials, making it difficult to maintain airtightness, such as causing delamination. Therefore, in this embodiment, a structure to ensure airtightness is provided on the lower cover 21. The detailed structure of the lower cover 21, including this structure, will be described below.

[0050] The lower cover 21 is insert-molded and fixed to the valve body 1 in the axial direction L, and as described above, it comprises an insert portion 21A, a connecting portion 21B, a plate portion 21C, and a folded portion 21D. More specifically, as shown in Figure 4, the insert portion 21A comprises a first insert portion 21A1 extending in the axial direction L within the resin of the valve body 1, and a second insert portion 21A2 extending radially outward in the X direction, continuous with one end L1 of the first insert portion 21A1 (one end in the axial direction L), within the resin of the valve body 1. The connecting portion 21B extends radially outward in the X direction, continuous with the second insert portion 21A2, and is exposed from the valve body 1. The plate portion 21C is continuous with the outer end edge of the connecting portion 21B, extends in the axial direction L along the side surface of the valve body 1, and is formed with its inner surface facing the inside of the valve body 1. As shown in Figure 4, this configuration results in the lower cover 21 having a crank-like shape in its vertical cross-section, with a step in the radial direction X between one side L1 and the other side L2. The radial X-facing surface of the first insert portion 21A1 (outward and inward), the axial L-facing surface of the second insert portion (one side L1 and the other side L2), the inner circumferential surface of the connecting portion 21B (i.e., the surface facing one side L1), and the inner circumferential surface of the plate portion 21C (i.e., the surface facing radial X inward) are in contact with the valve body 1 by insert molding. This increases the contact area between the valve body 1 and the contact portion 2, thereby improving the airtightness between the valve body 1 and the contact portion 2.

[0051] The surface of the second insert portion 21A2 facing one side L1 is the surface that receives the force applied to the connection portion 2 in the direction of the axis L (a force that causes the connection portion 2 to come out in the direction of the axis L) due to the pressure difference between the inside and outside of the valve body 1. By extending substantially perpendicular to the direction of the axis L, it constitutes a first contact portion S1 that contacts the resin interior of the valve body 1 in the direction in which a force is applied that resists the force that causes the connection portion 2 to come out. In other words, the surface of the connection portion 2 facing the side with the sleeve 51 in the direction of the axis L and the surface of the valve body 1 facing the opposite side from the side with the sleeve 51 in the direction of the axis L are in contact. In this embodiment, the first contact portion S1 is composed of a surface that extends substantially perpendicular to the direction of the axis L, but the configuration of the first contact portion S1 is not limited to this. For example, the first contact portion S1 may be a surface that extends intersecting the axis L direction at an angle, or it may be a projection with a line or point that intersects the axis L direction, rather than a surface. In either configuration, it is sufficient that the first contact portion S1 has a structure that can receive a force applied toward one side L1 in the axis L direction (a force that causes the connecting portion 2 to detach toward the axis L direction) and is in contact with the resin interior of the valve body 1.

[0052] Furthermore, the surfaces of the circumferential surface of the first insert portion 21A1 facing inward in the radial direction X and the surfaces facing outward in the radial direction X constitute a second contact portion S2 that contacts the resin interior of the valve body 1 in the radial direction X of the valve body 1. This second contact portion S2 is the surface that receives a force when a force is applied to the connection portion 2 in the radial direction X due to the pressure difference between the inside and outside of the valve body 1 (for example, a force that separates the contact surface between the connection portion 2 and the resin interior of the valve body 1 in the radial direction X), and extends perpendicular to the radial direction X. The configuration of the second contact portion S2 is not limited to that of the first contact portion S1. That is, the second contact portion S2 may be a surface that intersects and extends at an inclination with respect to the radial direction X, or it may be a projection with a line or point that intersects with respect to the radial direction X, rather than a surface. In any configuration, it is sufficient that it has a structure that receives a force when a force is applied in the radial direction X and is in contact with the resin interior of the valve body 1.

[0053] In this configuration, the first contact portion S1 and the second contact portion S2 ensure a sufficient contact area between the valve body 1 and the connecting portion 2 in both the axial L direction and the radial X direction, thereby suppressing a reduction in the anchoring effect at the contact surface. For this reason, even if the pressure inside the valve chamber 1a rises above the pressure outside the valve chamber 1a, and an outward force is applied to the inner surface of the valve body 1, and this force acts on the connecting portion 2 in the axial L direction or radial direction, the lower cover 21 is less likely to deform, and forces such as shear force are less likely to be generated at the contact surface between the valve body 1 and the resin interior.

[0054] Furthermore, as shown in Figure 5, a rough surface 21a with irregularities is formed on the circumferential surface of the insert portion 21A. The rough surface 21a is formed by creating fine recesses 21a1 or protrusions 21a2 using methods such as etching, plating, vapor deposition, or sputtering. The depth of the recesses 21a1 or the height s1 of the protrusions 21a2 is set to approximately 10 nm to 100 μm. In the area where this rough surface 21a is formed, the resin of the valve body 1 enters the gaps between the recesses 21a1 or protrusions 21a2, increasing the contact area between the valve body 1 and the connection portion 2, thereby improving the adhesion between the valve body 1 and the connection portion 2. Note that Figure 5 shows the rough surface 21a formed on the radially outward-facing surface of the first insert portion 21A1, but the position where the rough surface 21a is formed is not limited to this, and it can be anywhere on the circumferential surface of the insert portion 21A.

[0055] Furthermore, as shown in Figure 4, a through-hole 21b is formed through the circumferential surface of the insert portion 21A, penetrating in the thickness direction. As shown in Figure 7(A), the through-hole 21b is formed in a substantially circular shape when viewed from the side of the insert portion 21A. Of the inner circumferential surface of the through-hole 21b, the lateral surface 21b1 facing one side L1 constitutes the first contact portion S1, similar to the surface of the second insert portion 21A2 facing one side L1 described above. The lateral surface 21b2 facing the circumferential direction Y constitutes the third contact portion S3, which contacts the inside of the resin of the valve body 1 in the circumferential direction Y of the valve body 1. In this way, the formation of the through-hole 21b increases the area of ​​the surface facing the axial direction L in the insert portion 21A (in Figure 6, only the lateral surface 21b1 (first contact portion S1) is shown, but the surface of the through-hole 21b facing the other side L2 is also included). Furthermore, the surface area of ​​the insert portion 21A facing the circumferential direction Y (vertical surface 21b2 (third contact portion S3)) is increased. As a result, the contact area between the insert portion 21A and the inside of the resin of the valve body 1 is increased in the axial direction L and the circumferential direction Y, improving the airtightness between the valve body 1 and the connection portion 2.

[0056] As shown in Figure 7(B), the inner diameter dimension s2 of the through hole 21b is set to be larger than the plate thickness s3 of the insert portion 21A. As a result, sufficient contact between the inner circumferential surface of the through hole 21b and the inside of the resin of the valve body 1 is ensured within the range of the inner diameter dimension s2, which is larger than the plate thickness s3 of the insert portion 21A.

[0057] In this embodiment, as shown in Figure 6, four through holes 21b are formed at equal intervals in the circumferential direction of the valve body 1. That is, multiple first contact portions S1 and third contact portions S3 are provided at equal intervals in the circumferential direction Y of the valve body 1. In addition, multiple second contact portions S2, which are partially separated in the circumferential direction Y by the formation of the through holes 21b, are provided at equal intervals in the circumferential direction Y of the valve body 1. Therefore, the force applied to the inner surface of the valve body 1 and the inner surface of the connecting portion 2 can be received by the multiple first contact portions S1, second contact portions S2, or third contact portions S3 provided at equal intervals in the circumferential direction of the cylindrical insert portion 21A. Furthermore, the sum of the maximum lengths s4 of the first contact portions S1 in the circumferential direction is set to be less than half of the length s5 of the insert portion 21A in the circumferential direction Y.

[0058] As shown in Figure 7(B), the folded portion 21D is formed by bending the end of the other side L2 of the first insert portion 21A1 inward in the radial direction X. That is, the folded portion 21D is positioned at a different location in the axial direction L from the first contact portion S1 and the second contact portion S2. Note that the bending direction of the folded portion 21D is not limited to the inward radial direction X, but may also be the outward radial direction X. In other words, the folded portion 21D can be formed by bending the end of the other side L2 of the insert portion 21A in any direction in the radial direction X.

[0059] As described above, according to this embodiment, the valve body 1 is provided with a cylindrical insert portion 21A that is insert-molded in the axial direction L, and the insert portion 21A is provided with a first contact portion S1 and a second contact portion S2. Because the insert portion 21A is insert-molded in the axial direction L, the contact area with the inside of the resin of the valve body 1 can be increased in the axial direction L. Furthermore, the first contact portion S1 and the second contact portion S2 allow the insert portion 21A to contact the inside of the resin of the valve body 1 in both the direction in which a force is applied to resist the force that pulls out the connecting portion 2 in the axial direction L, and in the radial direction X of the valve body 1, thereby suppressing the reduction of the anchor effect described above at the contact surface. For this reason, when a force is applied outward to the inner surface of the valve body 1 due to the pressure difference between the inside and outside of the valve body 1, peeling of the contact surface can be prevented. Therefore, it is possible to obtain a slide-type switching valve 100 that improves the airtightness inside the valve body 1 by improving the airtightness between the resin valve body 1 and the connecting part 2 (a metal component that connects the valve body 1 and the sleeve 51).

[0060] Furthermore, because the third contact portion S3 allows the insert portion 21A to contact the resin interior of the valve body 1 in the circumferential direction Y of the valve body 1, the reduction of the aforementioned anchoring effect at the contact surface can be further suppressed.

[0061] Furthermore, in this embodiment, the first contact portion S1 and the third contact portion S3 can be formed by the lateral surface 21b1 and the vertical surface 21b2 of the through hole 21b. Therefore, the first contact portion S1 and the third contact portion S3 can be easily provided by forming the through hole 21b on the circumferential surface of the insert portion 21A by drilling or the like, thereby increasing the contact area between the insert portion 21A and the inside of the resin of the valve body 1 in the axial L direction and the circumferential Y direction.

[0062] Furthermore, as described above, the force applied to the inner surface of the valve body 1 can be received by the first contact portion S1, the second contact portion S2, or the third contact portion S3, which are provided at equal intervals in the circumferential direction Y of the cylindrical insert portion 21A, thus distributing the force evenly. Therefore, it is possible to prevent the valve body 1 and the connection portion 2 from separating due to the concentration of stress or other forces at a specific location.

[0063] Furthermore, since the sum of the maximum lengths s4 in the circumferential direction of the first contact portion S1 is kept to less than half of the circumferential length s5 of the insert portion 21A, the volume of the insert portion 21A can be sufficiently secured, and the reduction in strength of the insert portion 21A due to the provision of the first contact portion S1 can be suppressed.

[0064] Furthermore, by composing the lower cover 21 with an insert portion 21A, a connecting portion 21B, and a plate portion 21C, the aforementioned force applied to the inner surface of the valve body 1 can be received by the connecting portion 21B and the plate portion 21C, which are exposed from the valve body 1. In other words, the outer edge of the connecting portion 21B can be used as the starting point for deformation of the plate portion 21C. As a result, it is possible to prevent the force from extending to the insert portion 21A, thereby preventing the contact surface between the insert portion 21A and the resin interior of the valve body 1 from peeling off. Consequently, the airtightness between the valve body 1 and the connecting portion 2 can be further improved.

[0065] Furthermore, the folded portion 21D, the first contact portion S1, and the second contact portion S2, which are positioned at different locations in the axial direction L, can receive the force applied to the inner surface of the valve body 1 as described above, thus distributing the force. Therefore, it is possible to prevent the valve body 1 and the connecting portion 2 from separating due to the concentration of stress or other forces at a specific location.

[0066] Furthermore, a rough surface 21a is formed on the circumferential surface of the insert portion 21A. In this rough surface 21a portion, the resin of the valve body 1 fills the gap between the recessed portion 21a1 or the protruding portion 21a2, thereby increasing the contact area between the valve body 1 and the connecting portion 2, and thus improving the airtightness between the valve body 1 and the connecting portion 2.

[0067] Furthermore, the upper cover 20 and the lower cover 21 are integrally formed by welding the other end L2 of the upper cover 20 (one end in the direction of axis L) to the end L1 of one side of the plate portion 21C (one end in the direction of axis L). In other words, the welded portion W is formed by the plate portion 21C, which is not the insert portion 21A embedded in the valve body 1, and the end of the upper cover 20. This makes it possible to reduce the influence of welding heat during welding on the part of the connection portion 2 that is embedded in the valve body 1. Therefore, expansion and contraction of the valve body 1 due to welding heat can be suppressed, and thereby separation between the valve body 1 and the connection portion 2 can be suppressed.

[0068] In this way, by improving the airtightness between the resin valve body 1 and the connecting part 2 (a metal component that connects the valve body 1 and the sleeve 51), and by using a slide-type switching valve 100 that makes it easier to ensure airtightness inside the valve body 1, a refrigeration cycle system using this switching valve can be constructed.

[0069] Although embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and any design changes, etc., that do not depart from the spirit of the present invention are also included.

[0070] Figures 8(A) to 8(C) are longitudinal cross-sectional views showing variations of the connection portion 2 in the second embodiment. This second embodiment differs from the above-described embodiment in that, instead of a through hole 21b, a protrusion 21c, a recess 21d, or both a protrusion 21c and a recess 21d are formed. As shown in Figure 8(A), the protrusion 21c is formed projecting radially outward from the circumferential surface of the insert portion 21A (in this embodiment, the surface of the first insert portion 21A1 facing radially outward). Of the side surfaces of the protrusion 21c, the lateral surface 21c1 facing one side L1 constitutes the first contact portion S1, similar to the surface of the second insert portion 21A2 facing one side L1 described above. Furthermore, of the outer surfaces of the protrusion 21c, the top surface 21c2 of the protrusion 21c, i.e., the surface facing radially outward, constitutes the second contact portion S2, similar to the surface of the first insert portion 21A1 facing radially inward and the surface facing radially outward. Furthermore, the vertical surface (not shown) of the side surface of the protrusion 21c that faces the circumferential direction Y constitutes a third contact portion S3 that contacts the inside of the resin of the valve body 1 in the circumferential direction Y of the valve body 1. With this configuration, the first contact portion S1 and the third contact portion S3 can be easily provided on the circumferential surface of the insert portion 21A, for example, by forming the protrusion 21c by press molding.

[0071] Furthermore, the formation of the protrusion 21c increases the area of ​​the surfaces facing the axial direction L in the insert portion 21A (the lateral surface 21c1 (first contact portion S1) and the surface facing the other side L2 of the protrusion 21c). Also, the area of ​​the vertical surface facing the circumferential direction Y in the insert portion 21A increases. In the configuration in which the through hole 21b is formed as described above, the area of ​​the second contact portion S2 decreases as it penetrates the insert portion 21A in the thickness direction. However, in this embodiment, since the top surface 21c2 of the protrusion 21c constitutes the second contact portion S2 as described above, the reduction in the area of ​​the second contact portion S2 due to the formation of the protrusion 21c is suppressed, and the area of ​​the second contact portion S2 is maintained. In other words, by forming the protrusion 21c, the contact area between the insert portion 21A and the resin interior of the valve body 1 can be increased in the axial direction L and the circumferential direction Y while maintaining the area of ​​the second contact portion S2. This increases the contact area between the valve body 1 and the connecting portion 2 compared to the configuration that forms a through hole 21b, thereby further improving the airtightness between the valve body 1 and the connecting portion 2.

[0072] As shown in Figure 8(B), the recess 21d is formed as a recess in the radial direction X outward on the circumferential surface of the insert portion 21A (in this embodiment, the surface of the first insert portion 21A1 facing radially X inward). Of the side surfaces of the recess 21d, the lateral surface 21d1 facing one side L1 constitutes the first contact portion S1, similar to the surface of the second insert portion 21A2 facing one side L1 described above. The bottom surface 21d2 of the recess 21d, i.e., the surface facing radially X inward, constitutes the second contact portion S2, similar to the surface of the first insert portion 21A1 facing radially X inward and the surface facing radially X outward. The vertical surface 21d3 of the side surface of the recess 21d facing circumferential Y constitutes a third contact portion S3 that contacts the inside of the resin of the valve body 1 in the circumferential Y direction of the valve body 1. With this configuration, the first contact portion S1 and the third contact portion S3 can be easily provided on the circumferential surface of the insert portion 21A, for example, by forming a recess 21d by press molding.

[0073] Furthermore, the formation of the recess 21d increases the area of ​​the surfaces facing the axial direction L (the lateral surface 21d1 (first contact portion S1) and the surface facing the other side L2 of the recess 21d) in the insert portion 21A. Also, the area of ​​the vertical surface 21d3 facing the circumferential direction Y increases in the insert portion 21A. Since the bottom surface 21d2 of the recess 21d constitutes the second contact portion S2 as described above, the formation of the recess 21d prevents a reduction in the area of ​​the second contact portion S2, and the area of ​​the second contact portion S2 is maintained. In other words, by forming the recess 21d, the contact area between the insert portion 21A and the resin interior of the valve body 1 can be increased in both the axial direction L and the circumferential direction Y, while maintaining the area of ​​the second contact portion S2. As a result, the contact area between the valve body 1 and the connection portion 2 can be increased compared to the configuration in which a through hole 21b is formed, further improving the airtightness between the valve body 1 and the connection portion 2.

[0074] As shown in Figure 8(C), both the convex portion 21c and the concave portion 21d may be formed on the circumferential surface of the insert portion 21A. In this case, the arrangement of the convex portion 21c and the concave portion 21d may be reversed from that shown in Figures 8(A) and 8(B). That is, the convex portion 21c may be formed on the surface of the insert portion 21A facing radially inward X, and the concave portion 21d may be formed on the surface of the insert portion 21A facing radially outward X. Furthermore, multiple convex portions 21c and concave portions 21d may be arranged, and for each arrangement, the arrangement of the convex portion 21c and the concave portion 21d may be swapped between the surface of the insert portion 21A facing radially inward X and the surface facing radially outward X.

[0075] Furthermore, it is also possible to combine the protrusions 21c, recesses 21d, and the through-holes 21b described above and form them all on the insert portion 21A. That is, at least one of the protrusions 21c, recesses 21d, and through-holes 21b is provided on the circumferential surface of the insert portion 21A, and at least one of the protrusions 21c, recesses 21d, and through-holes 21b provided on the insert portion 21A constitutes the first contact portion S1 and the third contact portion S3. With such a configuration, at least one of the protrusions 21c, recesses 21d, and through-holes 21b is provided on the circumferential surface of the insert portion 21A, and at least one of the protrusions 21c, recesses 21d, and through-holes 21b provided on the insert portion 21A constitutes the first contact portion S1 and the third contact portion S3.

[0076] Figure 9 is a longitudinal cross-sectional view of the connection portion 2 in the third embodiment. The third embodiment differs from the other embodiments in that the folded portion 21D, the through hole 21b, the protrusion 21c, and the recess 21d are omitted. That is, in this embodiment, the first contact portion S1 is not formed by the side surface 21b1 of the through hole 21b, the side surface 21c1 of the protrusion 21c, or the side surface 21d1 of the recess 21d, as in the embodiments described above, but is formed by the surface facing one side L1 of the second insert portion 21A2. With this configuration, the first contact portion S1 and the second contact portion S2 ensure a contact area between the valve body 1 and the connection portion 2 in the axial L direction and the radial X direction.

[0077] Therefore, when the pressure inside the valve chamber 1a rises above the pressure outside the valve chamber 1a, an outward force is applied to the inner surface of the valve body 1. Even if this force acts on the connection part 2 in the axial L direction or radial X direction, the lower cover 21 is less likely to deform, and forces such as shear force are less likely to be generated on the contact surface with the resin interior of the valve body 1. Therefore, it is possible to prevent the separation of the contact surface when an outward force is applied to the inner surface of the valve body 1 due to the pressure difference between the inside and outside of the valve body 1. Thus, it is possible to obtain a slide-type switching valve 100 that improves the adhesion strength between the resin valve body 1 and the connection part 2 (metal member connecting the valve body 1 and the sleeve 51), and makes it easier to ensure airtightness inside the valve body 1. [Explanation of symbols]

[0078] L axis L1 One side (one end) S1 First contact part S2 Second contact part X radial direction 1 Valve body 2 Connection part 21A Insert section 51 sleeves 100 Slide-type switching valve

Claims

1. The valve comprises a cylindrical valve body, a cylindrical metal sleeve positioned at one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve to the open end edge of the valve body. The connecting portion comprises a cylindrical insert portion that is insert-molded axially with respect to the valve body, The circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied in the axial direction to resist the force that pulls the connecting portion out, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body. The circumferential surface of the insert portion is further provided with a third contact portion that contacts the inside of the resin of the valve body in the circumferential direction of the valve body. The circumferential surface of the insert portion is provided with at least one of a recess, a protrusion, and a through hole. A sliding switching valve characterized in that the first contact portion and the third contact portion are formed by at least one of the recess, the protrusion, and the through hole provided in the insert portion.

2. The slide-type switching valve according to claim 1, characterized in that the first contact portion and the third contact portion are provided in multiple locations at equal intervals in the circumferential direction.

3. The sliding switching valve according to claim 2, characterized in that the sum of the maximum lengths in the circumferential direction of the first contact portion is less than half the length in the circumferential direction of the insert portion.

4. The insert portion comprises a first insert portion extending in the axial direction and a second insert portion extending radially outward from one end of the first insert portion in the axial direction, The sliding switching valve according to claim 1, characterized in that the connecting portion comprises the insert portion, a connecting portion that extends radially outward and is continuous with the second insert portion and exposed from the valve body, and a plate portion that extends axially along the side surface of the valve body and is continuous with the outer end edge of the connecting portion, with its inner surface facing the inside of the valve body.

5. The aforementioned connection part includes a cylindrical upper cover connected to the sleeve, It comprises a lower cover connected to the upper cover, The lower cover comprises the insert portion, the connecting portion, and the plate portion. The sliding switching valve according to claim 4, characterized in that the upper cover and the lower cover are integrally formed by a welded portion where one end of the upper cover in the axial direction and one end of the plate portion in the axial direction are welded together.

6. The insert portion is provided with a folded portion that bends in the radial direction, The sliding switching valve according to claim 1, characterized in that the first contact portion, the second contact portion, and the folded portion are arranged at different positions in the axial direction.

7. The slide-type switching valve according to claim 1, characterized in that an uneven, rough surface is formed on the circumferential surface of the insert portion.

8. The valve comprises a cylindrical valve body, a cylindrical metal sleeve positioned at one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve to the open end edge of the valve body. The connecting portion comprises a cylindrical insert portion that is insert-molded axially with respect to the valve body, The circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied in the axial direction to resist the force that pulls the connecting portion out, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body. A sliding type switching valve characterized in that the first contact portion and the second contact portion are provided in multiple locations at equal intervals in the circumferential direction of the valve body.

9. The sliding switching valve according to claim 8, characterized in that the sum of the maximum lengths in the circumferential direction of the first contact portion is less than half the length in the circumferential direction of the insert portion.

10. The valve comprises a cylindrical valve body, a cylindrical metal sleeve positioned at one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve to the open end edge of the valve body. The connecting portion comprises a cylindrical insert portion that is insert-molded axially with respect to the valve body, The circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied in the axial direction to resist the force that pulls the connecting portion out, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body. The insert portion comprises a first insert portion extending in the axial direction and a second insert portion extending radially outward from one end of the first insert portion in the axial direction, The connecting portion is characterized by comprising: the insert portion; a connecting portion that is continuous with the second insert portion and extends radially outward, exposed from the valve body; and a plate portion that is continuous with the outer end edge of the connecting portion and extends axially along the side surface of the valve body, with its inner surface facing the inside of the valve body.

11. The aforementioned connection part includes a cylindrical upper cover connected to the sleeve, It comprises a lower cover connected to the upper cover, The lower cover comprises the insert portion, the connecting portion, and the plate portion. The sliding switching valve according to claim 10, characterized in that the upper cover and the lower cover are integrally formed by a welded portion where one end of the upper cover in the axial direction and one end of the plate portion in the axial direction are welded together.

12. The valve comprises a cylindrical valve body, a cylindrical metal sleeve positioned at one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve to the open end edge of the valve body. The connecting portion comprises a cylindrical insert portion that is insert-molded axially with respect to the valve body, The circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied in the axial direction to resist the force that pulls the connecting portion out, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body. The insert portion is provided with a folded portion that bends in the radial direction, A sliding switching valve characterized in that the first contact portion, the second contact portion, and the folded portion are arranged at different positions in the axial direction.

13. The valve comprises a cylindrical valve body, a cylindrical metal sleeve positioned at one axial end of the valve body, and a connecting portion connecting the open end edge of the sleeve to the open end edge of the valve body. The connecting portion comprises a cylindrical insert portion that is insert-molded axially with respect to the valve body, The circumferential surface of the insert portion is provided with a first contact portion that contacts the resin interior of the valve body in a direction in which a force is applied in the axial direction to resist the force that pulls the connecting portion out, and a second contact portion that contacts the resin interior of the valve body in the radial direction of the valve body. A sliding type switching valve characterized in that the circumferential surface of the insert portion has an uneven, rough surface.

Images