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 valve body 1, and a connection part 2 provided on the valve body 1 with insert molding. Inside the valve body 1 a valve chest 1a is provided, and outside the valve body 1, an external space S1 is provided. In the external space S1, a second space S2 is provided where a high pressure and a low pressure are switched. In the slide type switching valve 100, a seal member 13 is provided for restricting the flow of fluid via a virtual communication path 14 from the valve chest 1a into the second space S2 when peeling occurs on a contact surface where each of the inner face and the outer face of the connection part 2 and the resin inside of the valve body 1 contact each other to form the virtual communication path 14. The seal member 13 is arranged between the valve chest 1a and the second space S2.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, as slide-type switching valves used in a refrigeration cycle or the like, a four-way valve for switching a fluid flow path, a pilot-type electromagnetic flow path switching valve, and the like are known (see, for example, Patent Documents 1 and 2). The four-way valve described in Patent Document 1 includes a cylindrical valve box (hereinafter referred to as a valve body) that constitutes a valve chamber inside, a planar circular connection plate fixed to the opening edge of the valve body, and a non-magnetic sleeve fixed through the connection plate. An outer periphery of the sleeve is provided with a coil and a yoke of a magnetic material, and a part of a drive unit is constituted.

[0003] The pilot-type electromagnetic flow path switching valve described in Patent Document 2 includes a cylindrical main valve housing (hereinafter referred to as a valve body) having a main valve chamber inside, and a compressor housing (hereinafter referred to as a housing) in which a valve device receiving hole for receiving the main valve housing is formed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, in slide-type switching valves as described in Patent Documents 1 and 2, the valve body is sometimes molded from resin material, while the sleeve and connecting plate are made of metal. In this case, it is conceivable to fix the connecting plate to the valve body by insert molding and connect the valve body and sleeve via this connecting plate. However, since the inside of the valve body is under 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 is a risk that the contact surface where the connecting plate and the resin interior of the valve body come into contact with each other may peel off. Therefore, it is difficult to ensure airtightness between the valve body, which is a resin part, and the connecting plate, which is a metal part, and it is difficult to maintain airtightness inside the valve body.

[0006] Furthermore, in the configuration described in Patent Document 2, a space is created between the valve body and the housing that communicates with both the low-pressure and high-pressure fluid passages. As a result, the pressure outside the valve body fluctuates between low and high pressure, making the aforementioned pressure difference prone to fluctuation. Consequently, an inconsistent outward force is repeatedly applied to the inner surface of the valve body, further increasing the risk of separation between the connecting plate and the valve body. Moreover, for example, if the connecting plate and the valve body separate and a portion of it communicates with the inside and outside of the valve body, high-pressure fluid can enter that portion, causing further separation between the connecting plate and the valve body, making it even more difficult to ensure airtightness between the valve body and the connecting plate.

[0007] The object of the present invention is to provide 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 that facilitates ensuring airtightness inside the valve body. [Means for solving the problem]

[0008] To solve the aforementioned problems and achieve the objective, the present invention provides a slide-type switching valve comprising a cylindrical valve body made of resin and a cylindrical insert member made of metal provided by insert molding on one axial end of the valve body, wherein a high-pressure first space is provided inside the valve body, an external space is provided outside the valve body, partitioned by an interface surrounding the radially outer side of the valve body, a second space is provided in the external space where high pressure and low pressure are switched, the insert member has an inner surface of a portion of the exposed part exposed from the valve body located in the first space, and an outer surface of a portion of the exposed part located in the external space, and when delamination occurs at the contact surfaces where the inner and outer surfaces of the insert member and the resin interior of the valve body come into contact with each other, forming a virtual communication passage with one end opening to the first space, a sealing member is provided to restrict the flow of fluid from the first space to the second space through the virtual communication passage, the sealing member is disposed between the first space and the second space. The virtual passage has a virtual inlet at one end located in the first space and a virtual outlet at the other end located in the external space, the sealing member abuts against the outer surface of the valve body and the boundary surface, and a third space where the virtual outlet is located is defined between the exposed portion of the insert member and the second space. It is characterized by the following:

[0009] According to the present invention, even if delamination occurs at the contact surface between the valve body and the insert member due to a pressure difference inside and outside the valve body, and a virtual communication passage is formed, the sealing member can restrict the flow of fluid from the first space to the second space through the virtual communication passage. Therefore, it is possible to suppress the increase in refrigerant entering the delaminated portion at the contact surface and suppress the expansion of the delaminated portion. As a result, the adhesion strength at the contact surface can be improved compared to conventional configurations in which delamination at the contact surface is likely to progress. Furthermore, as described above, even if a virtual communication passage is formed, the flow of fluid from the first space to the second space can be restricted by the sealing member, so that the airtightness inside the valve body can be ensured. Therefore, 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 that easily ensures the airtightness inside the valve body. Furthermore, with this configuration, the sealing member can partition a third space between the exposed portion of the insert member and the second space, where the virtual outlet of the virtual communication passage is located, and can also restrict the flow of fluid from the first space to the second space. As a result, fluid flowing from the first space to the second space can be retained in the third space. Therefore, in addition to the action and effect of the sealing member described above, it is possible to make it even more difficult for the first space and the second space to communicate. Consequently, it is possible to suppress the increase in refrigerant entering the peeled portion of the contact surface, suppress the expansion of the peeled portion, and suppress the decrease in the airtightness between the valve body and the insert member.

[0011] Furthermore, it is preferable that the sealing member is positioned to surround the insert member in the circumferential direction. With this configuration, even if a force is applied to the inner surface of the valve body, for example radially outward, the sealing member can absorb that force, thus preventing deformation of the insert member and the valve body integrated with the insert member in the same direction. This suppresses the peeling and the formation of virtual communication passages associated with peeling, and improves the adhesion strength between the resin valve body and the metal member connecting the valve body and the sleeve.

[0012] Furthermore, it is preferable that the portion of the outer surface of the valve body surrounding the insert member in the circumferential direction constitutes a partition portion that protrudes toward the interface, and that the partition portion is provided with a groove portion that opens toward the interface, and that the sealing member is provided in contact with the bottom surface of the groove portion and the interface. With this configuration, by installing the sealing member in the groove portion provided in the partition portion, the sealing member can be positioned to surround the insert member in the circumferential direction. Therefore, even if a force is applied to the inner surface of the valve body, for example radially outward, that force can be stably received by the sealing member. In addition, since the partition portion protrudes toward the interface, if a force is applied to the inner surface of the valve body, for example radially outward, and the valve body attempts to deform in the same direction, the partition portion, in addition to the sealing member, can receive this force. Therefore, deformation of the insert member and the valve body can be further suppressed, and the above-mentioned peeling and the formation of a virtual communication passage associated with peeling can be further suppressed.

[0013] Furthermore, it is preferable that the exposed portion of the insert member is provided with a through hole that connects the first space and the third space. With this configuration, for example, if the refrigerant accumulated in the third space expands rapidly due to a temperature change, the refrigerant can be allowed to flow into the first space through the through hole. This prevents damage to the partition, valve body, or insert member due to unintended changes in pressure within the third space.

[0014] Also, A sliding type switching valve comprising a cylindrical valve body made of resin and a cylindrical metal insert member provided by insert molding on one axial end of the valve body, wherein a high-pressure first space is provided inside the valve body, an external space is provided outside the valve body, partitioned by an interface surrounding the radially outer side of the valve body, a second space is provided in the external space where high pressure and low pressure are switched, the insert member has an inner surface of a portion of the exposed part exposed from the valve body located in the first space, and an outer surface of a portion of the exposed part located in the external space, and when delamination occurs at the contact surfaces where the inner and outer surfaces of the insert member and the resin interior of the valve body come into contact with each other, forming a virtual communication passage with one end opening to the first space, a sealing member is provided to restrict the flow of fluid from the first space to the second space through the virtual communication passage, the sealing member is positioned between the first space and the second space, The valve body may be provided with an opposing surface that faces the inner surface of the insert member in the first space, and the sealing member may be positioned between the inner surface of the insert member and the opposing surface. With this configuration, the flow of fluid attempting to move from between the inner surface of the insert member and the opposing surface through a virtual communication passage to the second space can be restricted by the sealing member.

[0015] Also, A sliding type switching valve comprising a cylindrical valve body made of resin and a cylindrical metal insert member provided by insert molding on one axial end of the valve body, wherein a high-pressure first space is provided inside the valve body, an external space is provided outside the valve body, partitioned by an interface surrounding the radially outer side of the valve body, a second space is provided in the external space where high pressure and low pressure are switched, the insert member has an inner surface of a portion of the exposed part exposed from the valve body located in the first space, and an outer surface of a portion of the exposed part located in the external space, and when delamination occurs at the contact surfaces where the inner and outer surfaces of the insert member and the resin interior of the valve body come into contact with each other, forming a virtual communication passage with one end opening to the first space, a sealing member is provided to restrict the flow of fluid from the first space to the second space through the virtual communication passage, the sealing member is positioned between the first space and the second space, The virtual passage has a virtual inlet at one end located in the first space and a virtual outlet at the other end located in the external space. The portion of the outer surface of the valve body surrounding the insert member in the circumferential direction constitutes a partition portion that protrudes toward the boundary surface, and the sealing member may be provided in contact with the partition portion and the outer surface of the exposed portion of the insert member. With this configuration, since the sealing member is provided in contact with the partition portion and the outer surface of the exposed portion of the insert member, the flow of fluid from the first space to the second space can be restricted by the sealing member at a position close to the virtual outlet. [Effects of the Invention]

[0016] According to the present invention, it is possible to obtain a slide-type switching valve that improves the airtightness between the resin valve body and the metal member connecting the valve body and the sleeve, and that makes it easier to ensure airtightness inside the valve body. [Brief explanation of the drawing]

[0017] [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] A longitudinal cross-sectional view of a sliding type switching valve in the first embodiment. [Figure 4] Enlarged view of the main part in region A of Figure 3. [Figure 5] Enlarged view of the main part of a sliding type switching valve in a modified example of the first embodiment. [Figure 6] Vertical cross-sectional view of the slide type switching valve in the second embodiment. [Figure 7] Enlarged view of the main part in region B of FIG. 6. [Figure 8] Enlarged view of the main part of the slide type switching valve in a modified example of the second embodiment. [Figure 9] Vertical cross-sectional view of the slide type switching valve in the third embodiment. [Figure 10] Enlarged view of the main part in region C of FIG. 9. [Figure 11] Enlarged view of the main part of the slide type switching valve in a modified example of the third embodiment. [Figure 12] Vertical cross-sectional view of a conventional slide type switching valve. [Figure 13] Enlarged view of the main part in region D of FIG. 12. [Figure 14] Vertical cross-sectional view of a conventional slide type switching valve. [Figure 15] Enlarged view of the main part in region E of FIG. 14.

MODE FOR CARRYING OUT THE INVENTION

[0018] Hereinafter, the first embodiment of the present invention will be described based on FIGS. 1 to 4. 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 for switching the flow path of the refrigerant (fluid) flowing through these devices. The slide type switching valve 100 includes a resin-made cylindrical valve body 1, a connection portion 2 (insert member) provided in the valve body 1 by insert molding, a valve seat portion 3 fixed in the valve body 1, a valve element 4 provided slidably in the axial direction L inside the valve body 1, and a drive portion 5 for slidably driving the valve element 4.

[0019] In this embodiment, the side of the valve body 1 with the drive unit 5 in the axial direction L is referred to as one side in the axial direction L, and the side opposite to one side in the axial direction L is referred to as the other side in the axial direction L. Furthermore, one side in the axial direction L may be referred to as side L1, and the other side in the axial direction L may be referred to as other side L2. In addition, the direction perpendicular to the axial direction L is referred to as the radial direction, and the direction around the axial direction L is referred to as the circumferential direction. The radial direction may be referred to as radial direction X, and the circumferential direction may be referred to as circumferential direction Y.

[0020] As shown in Figures 1 and 2, 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 a resin such as polyphenylene sulfide (PPS) 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. High-pressure refrigerant compressed by the compressor 200 flows into the valve chamber 1a via the D port 1d, so the valve chamber 1a constitutes a first space with a higher pressure than the outside of the valve body 1.

[0021] 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. The outer peripheral surface of one end L1 of the side wall 11 forms an opposing surface 11a in the valve chamber 1a that faces the inner peripheral surface of the plate portion 21B2 of the lower cover 21, which will be described later, in the radial direction X.

[0022] 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.

[0023] The connecting part 2 is a cylindrical metal member that connects the valve body 1 and the sleeve 51, which will be described later. It is fixed to the open end edge of one side L1 (one end in the direction of the axial line L of the valve body 1) 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 of one side L1 of the upper cover 20 is welded to the open end edge of the other side L2 of the sleeve 51. The open end edge of the other side L2 of the upper cover 20 is formed to expand in diameter in the radial direction X.

[0024] The lower cover 21 is a cylindrical metal member provided on one side L1 (one end in the axial direction L) of the valve body 1 by insert molding. As shown in Figure 3, 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 inside the resin of the valve body 1), and an exposed portion 21B that is continuous with the insert portion 21A and exposed from the valve body 1. The insert portion 21A comprises a first insert portion 21A1 that extends in the axial direction L inside the resin of the valve body 1, and a second insert portion 21A2 that extends radially outward X, continuous with the end of one side L1 (one end in the axial direction L) of the first insert portion 21A1 inside the resin of the valve body 1.

[0025] The other end L2 of the first insert portion 21A1 is provided with a folded portion 21C formed by bending the first insert portion 21A1 inward in the radial direction X. The bending direction of the folded portion 21C is not limited to inward in the radial direction X, but may also be outward in the radial direction X. In other words, the folded portion 21C can be formed by bending the insert portion 21A in either direction in the radial direction X.

[0026] The exposed portion 21B includes a connecting portion 21B1 that extends radially outward in the X direction, continuous with the second insert portion 21A2, and is exposed from the valve body 1, and a plate portion 21B2 that extends axially in the L direction along the side surface of the valve body 1, continuous with the outer end edge of the connecting portion 21B1, and whose inner surface faces the inside of the valve body 1. A through hole 21D is formed in the connecting portion 21B1, penetrating in the axial L direction (plate thickness direction). This through hole 21D is a hole that connects the valve chamber 1a to the third space S3, which will be described later. The surface of the plate portion 21B2 that faces radially inward in the X direction (i.e., the inner surface of a part of the exposed portion 21B) is located in the valve chamber 1a, and the surface of the plate portion 21B2 that faces radially outward in the X direction (i.e., the outer surface of a part of the exposed portion 21B) is located in the external space S1, which will be described later.

[0027] The valve body 1 and connecting part 2 formed in this manner are housed in a housing 6. 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 connecting part 2 are inserted into this housing hole 6a in the direction of the axis L. A retaining ring 7 is fixed to one side L1 of the housing hole 6a, which abuts against the upper cover 20 of the valve body 1, and this retaining ring 7 prevents the valve body 1 from coming out of the housing 6.

[0028] A D-connection passage 6d is formed in the bottom wall of housing 6, which communicates with the D-port 1d and D-connection passage 1d1 described above. A D-connection pipe 1d2 is installed in the D-connection passage 6d. Multiple connection passages are formed in the side wall of housing 6, which communicate with the E-connection passage 1e, S-connection passage 1s, and C-connection passage 1c described above, respectively. These E-connection passage 6e, S-connection passage 6s, and C-connection passage 6c are formed in this order along the axis L direction from one side L1. The destinations of each connection passage 6e, 6s, and 6c are as described above, so their explanation is omitted.

[0029] As described above, since the housing hole 6a has an inner diameter larger than the outer diameter of the valve body 1, an external space S1 is provided outside the valve body 1, partitioned by the inner circumferential surface 6a1 (boundary surface) of the housing hole 6a that surrounds the radially X-outside side of the valve body 1. As shown in Figure 3, an O-ring 8 is installed between the outer circumferential surface of the valve body 1 and the inner circumferential surface 6a1 of the housing hole 6a. This O-ring 8 partitions the external space S1 into multiple adjacent spaces in the axial direction L, thereby providing multiple second spaces S2 in the external space S1 that are connected to the E-connection passage 6e, the S-connection passage 6s, and the C-connection passage 6c, respectively. When the valve body 4, which will be described later, is driven, the communication state of the E-connection passage 6e, the S-connection passage 6s, and the C-connection passage 6c is switched, and the pressure of the refrigerant flowing through these passages fluctuates, so the second spaces S2 are spaces where high pressure and low pressure are switched.

[0030] As shown in Figure 3, on the outer surface of the valve body 1, at a position L1 on one side L1 of the E connecting passage 6e and at a position L2 on the other side L2 of the exposed portion 21B of the lower cover 21, that is, at a position on the outer surface of the valve body 1 that surrounds the insert portion 21A in the circumferential direction Y (a position adjacent to the insert portion 21A in the radial direction X), a partition portion 12 protruding toward the inner circumferential surface 6a1 is formed along the entire circumference in the circumferential direction Y. In other words, the portion of the outer surface of the valve body 1 that surrounds the connecting portion 2 in the circumferential direction constitutes a partition portion 12 that protrudes toward the inner circumferential surface 6a1. As shown in Figure 4, an annular groove 12a (groove portion) that opens toward the inner circumferential surface 6a1 is formed in the partition portion 12. A sealing member 13 made of a material such as an O-ring is installed in the annular groove 12a. That is, the sealing member 13 is positioned to surround the connecting portion 2 in the circumferential direction Y.

[0031] The sealing member 13 has its radially outer end in contact with the inner circumferential surface 6a1 and its radially inner end in contact with the bottom surface of the annular groove 12a, thereby partitioning the third space S3, where the virtual outlet 14b described later is located, between the exposed portion 21B of the lower cover 21 and the second space S2. As described above, since the partition portion 12 is part of the outer surface of the valve body 1, the sealing member 13 is in contact with the outer surface of the valve body 1 and the inner circumferential surface 6a1, partitioning the third space S3, where the virtual outlet 14b is located, between the exposed portion 21B and the second space S2. With this configuration, the movement of refrigerant is restricted between the second space S2 and the third space S3, with the sealing member 13 as the boundary. Furthermore, because the third space S3 is not connected to any of the E-connection passage 6e, S-connection passage 6s, or C-connection passage 6c due to the position of the sealing member 13 described above, it is a space where switching between high and low pressure is difficult, unlike the second space S2.

[0032] In this embodiment, as described above, the sealing member 13 was placed in the annular groove 12a of the partition portion 12. However, although not shown in the figures, the partition portion 12 can be omitted. In this case, for example, the placement of the sealing member 13 can be kept the same, but its width and diameter dimensions can be adjusted so that the radially X inner end of the sealing member 13 abuts against the outer circumferential surface of the valve body 1 without the partition portion 12, and the radially X outer end of the sealing member abuts against the inner circumferential surface 6a1 of the housing hole 6a.

[0033] 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.

[0034] 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 flow path for the refrigerant. 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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 3, 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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, i.e., the first space, to become extremely high-pressure, and a pressure difference is easily created between the inside and outside of the valve body 1. For this reason, 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 at the joint between the valve body 1 (resin), which is made of a different material, and the connecting part 2 (metal). For this reason, it is difficult to ensure airtightness between the resin interior of the valve body 1 and the connecting part 2.

[0051] Furthermore, as described above, the communication state of the E switching port 3e, S port 3s, and C switching port 3c is switched, so the pressure in the second space S2 communicating with the E switching port 3e, S port 3s, and C switching port 3c is prone to change. For this reason, the pressure difference inside and outside the valve body 1 is prone to change, and a non-constant force, such as the shear force described above, may intermittently act on the joint between the valve body 1 and the connection part 2. For these reasons, in the conventional slide-type switching valves 101 and 102 shown in Figures 12 to 15, there was a possibility of delamination occurring at the contact surfaces where the inner and outer surfaces of the lower covers 22 (shown in Figures 12 and 13) and 23 (shown in Figures 14 and 15) and the resin interior of the valve body 1A (shown in Figures 12 and 13) and 1B (shown in Figures 14 and 15) come into contact with each other. Furthermore, once delamination occurs, refrigerant can penetrate that area, causing the delamination to progress and potentially forming a connecting passage with inlets located in valve chambers 1A1 and 1B1, as shown by dashed lines in Figures 13 and 15.

[0052] Here, if we define the passage as a virtual passage 14, and the inlet at one end of the virtual passage 14 as a virtual inlet 14a, and the outlet at the other end of the virtual passage 14 as a virtual outlet 14b, then in Figures 13 and 15, the virtual inlet 14a opens to the valve chambers 1A1 and 1B1, i.e., the first space, and the virtual outlet 14b opens to the second space S2 (external space S1). Therefore, when the virtual passage 14 is formed, the first space and the second space S2 will be in communication via the virtual passage 14.

[0053] In contrast, in this embodiment, as shown in Figure 4, a partition portion 12 is formed at a position surrounding the insert portion 21A in the circumferential direction Y, and a sealing member 13 is installed in the annular groove 12a of the partition portion 12. That is, the partition portion 12 and the sealing member 13 are located at a position surrounding the connection portion 2 in the circumferential direction Y. Therefore, even if a force is applied to the inner surface of the valve body 1, for example, radially outward in the X direction, the sealing member 13 can receive that force, and the sealing member 13 prevents deformation of the inner surface of the valve body 1 or the lower cover 21 in the same direction. As a result, the above-mentioned peeling and the formation of a virtual communication passage 14 associated with peeling are less likely to occur. Furthermore, in this configuration, the partition portion 12 protrudes toward the inner circumferential surface 6a1, and the sealing member 13 is installed in the annular groove 12a that opens toward the inner circumferential surface 6a1. Therefore, as described above, when a force is applied to the inner surface of the valve body 1 radially outward in the X direction, and the valve body 1 etc. attempt to deform in the same direction, the protruding end may come into contact with the inner circumferential surface 6a1. In that case, the force can be applied to the sealing member 13 and also received by the partition portion 12, so deformation of the inner surface of the valve body 1 and the lower cover 21 in the radial direction X outward is further suppressed, thereby suppressing the peeling and the formation of the virtual communication passage 14 associated with the peeling.

[0054] Furthermore, if delamination occurs at the contact surfaces where the inner and outer surfaces of the lower cover 21 and the resin interior of the valve body 1 come into contact with each other, and a virtual communication passage 14 is formed, the virtual communication passage 14 has a virtual inlet 14a located in the valve chamber 1a and a virtual outlet 14b located in the third space S3, allowing the refrigerant to move from the valve chamber 1a to the third space S3. However, even if the refrigerant moves from the valve chamber 1a to the third space S3 through the virtual communication passage 14, its movement to the second space S2 is restricted by the sealing member 13. In other words, the sealing member 13, positioned between the valve chamber 1a and the second space S2, restricts the flow of refrigerant from the valve chamber 1a to the second space S2 via the virtual communication passage 14. With this configuration, the virtual communication passage 14 is unlikely to form in the first place, and even if the virtual communication passage 14 does form, the refrigerant flowing out from the valve chamber 1a will not reach the second space S2 where the high and low pressures switch, but will remain in the third space S3 where the switching between high and low pressures is less likely to occur. As a result, the pressure difference between the inside and outside of the valve body 1 near the bottom cover 21 will not change easily, and the intermittent action of non-constant forces such as the shear force mentioned above will be suppressed.

[0055] Furthermore, as described above, since a through hole 21D is formed in the connecting portion 21B1, if, for example, the refrigerant accumulated in the third space S3 expands rapidly due to a temperature change, the refrigerant will move to the valve chamber 1a through the through hole 21D. Therefore, even if the pressure in the third space S3 changes unintentionally, the partition portion 12, the valve body 1, or the lower cover 21 will not be damaged by the pressure change.

[0056] As described above, according to this embodiment, even if delamination occurs at the contact surface between the valve body 1 and the connecting part 2 (insert member) due to a pressure difference inside and outside the valve body 1, and a virtual communication passage 14 is formed, the sealing member 13 can restrict the flow of refrigerant from the valve chamber 1a (first space) to the second space S2 via the virtual communication passage 14. Therefore, the increase in refrigerant entering the delaminated portion at the contact surface can be suppressed, and the expansion of the delaminated portion can be suppressed. As a result, the adhesion strength at the contact surface can be improved compared to conventional configurations in which delamination at the contact surface is more likely to progress. Furthermore, as described above, even if a virtual communication passage 14 is formed, the flow of fluid from the valve chamber 1a to the second space S2 can be restricted by the sealing member 13, so that the airtightness inside the valve body 1 can be ensured. Therefore, a slide-type switching valve 100 can be obtained that improves the adhesion strength between the resin valve body 1 and the connecting part 2 (metal member connecting the valve body and sleeve), and that easily ensures the airtightness inside the valve body 1.

[0057] Furthermore, in this embodiment, the sealing member 13 partitions the third space S3 where the virtual outlet 14b is located between the exposed portion 21B of the connection portion 2 and the second space S2, and restricts the flow of fluid from the valve chamber 1a into the second space S2. As a result, the fluid flowing from the valve chamber 1a to the second space S2 can be retained in the third space S3. Therefore, in addition to the action and effect of the sealing member 13 described above, it is possible to make it even more difficult for the valve chamber 1a and the second space S2 to communicate. Consequently, it is possible to suppress the increase in refrigerant entering the peeled portion of the contact surface, suppress the expansion of the peeled portion, and suppress the decrease in the airtightness between the valve body 1 and the connection portion 2.

[0058] Furthermore, as described above, since the sealing member 13 is positioned to surround the connection portion 2 in the circumferential direction Y, even if a force is applied to the inner surface of the valve body 1, for example, radially outward in the direction X, the sealing member 13 can absorb that force, and deformation of the connection portion 2 and the valve body 1, which is integrated with the connection portion 2, in the same direction is suppressed by the sealing member 13. Therefore, the peeling and the formation of the virtual communication passage 14 associated with peeling are suppressed, and the adhesion strength between the resin valve body 1 and the connection portion 2 can be improved.

[0059] Furthermore, by installing the sealing member 13 in the annular groove 12a provided in the partition portion 12, the sealing member 13 can be positioned in a portion that surrounds the connection portion 2 in the circumferential direction. Therefore, even if a force is applied to the inner surface of the valve body 1, for example, radially outward, that force can be stably received by the sealing member 13. Also, since the partition portion 12 protrudes toward the inner circumferential surface 6a1, if a force is applied to the inner surface of the valve body 1, for example, radially outward, and the valve body 1 attempts to deform in the same direction, the partition portion 12 can receive this force in addition to the sealing member 13. Therefore, deformation of the connection portion 2 and the valve body 1 can be further suppressed, and the separation and formation of the virtual communication passage 14 associated with the separation can be further suppressed.

[0060] Furthermore, since the exposed portion 21B of the connection portion 2 is provided with a through hole 21D that connects the valve chamber 1a and the third space S3, for example, if the refrigerant accumulated in the third space S3 expands rapidly due to a temperature change, the refrigerant can be allowed to flow into the valve chamber 1a through the through hole 21D. This prevents damage to the partition portion 12, the valve body 1, or the connection portion 2 due to unintended changes in the pressure inside the third space S3.

[0061] In this way, the seal strength between the resin valve body 1 and the connecting part 2 (a metal component that connects the valve body 1 and the sleeve 51) is improved, and a slide-type switching valve 100 that makes it easier to ensure airtightness inside the valve body 1 can be used as a flow path switching valve, thus enabling the construction of a refrigeration cycle system using this flow path switching valve.

[0062] 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.

[0063] Figure 5 is an enlarged view of the main part of the slide-type switching valve 100 in a modified example of the first embodiment. This modified version differs from the first embodiment described above in that the through hole 21D of the connecting portion 21B1 is omitted. With this configuration, in addition to the operation and effects of the first embodiment described above, the number of man-hours required for processing the connecting portion 2 can be reduced, and the manufacturing cost of the sliding switching valve 100 can be reduced.

[0064] Next, a second embodiment of the slide-type switching valve 100 according to the present invention and a modified example of the second embodiment will be described. Figure 6 is a longitudinal cross-sectional view of the slide-type switching valve 100 in the second embodiment. Figure 7 is an enlarged view of the main part in area B of Figure 6. Figure 8 is an enlarged view of the main part of the slide-type switching valve 100 in a modified example of the second embodiment.

[0065] In the second embodiment, the partition portion 12 and the annular groove 12a are omitted, and the arrangement of the sealing member 13 differs from the first embodiment and its modified form described above. As shown in Figure 6, the sealing member 13 is positioned between the inner surface of the plate portion 21B2 (the inner surface of the insert member) and the opposing surface 11a. With this configuration, as shown in Figure 7, even if a virtual communication passage 14 is formed, the sealing member 13 can prevent the refrigerant attempting to move from the valve chamber 1a to the second space S2 from reaching the virtual inlet 14a (i.e., the position on the contact surface that can be the starting point of delamination). This restricts the movement of refrigerant from the valve chamber 1a to the second space S2. In this way, the flow of refrigerant attempting to move from the inner surface of the connecting portion 2 (insert member) and the opposing surface 11a through the virtual communication passage 14 to the second space S2 can be restricted by the sealing member 13.

[0066] In the modified version of the second embodiment, as shown in Figure 8, the sealing member 13 is made of adhesive instead of an O-ring, which is a difference from the second embodiment. With this configuration as well, similar to the operation and effect of the second embodiment, the flow of refrigerant attempting to move to the second space S2 through the virtual communication passage 14 from between the inner surface of the connection part 2 and the opposing surface 11a can be restricted by the sealing member 13. Note that the sealing member 13 is not limited to an O-ring or adhesive; for example, it may be made of an elastic sealing material such as a packing or gasket molded from a resin such as polytetrafluoroethylene (PTFE).

[0067] Next, a third embodiment and a modified example of the slide-type switching valve 100 according to the present invention will be described. Figure 9 is a longitudinal cross-sectional view of the slide-type switching valve 100 in the third embodiment. Figure 10 is an enlarged view of the main part in area C of Figure 9. Figure 11 is an enlarged view of the main part of the slide-type switching valve 100 in a modified example of the third embodiment. In the third embodiment, the configuration of the first insert portion 21A1 and the second insert portion 21A2, the shape of the partition portion 12, and the arrangement of the sealing member 13 differ from the above-described embodiment and modified example.

[0068] As shown in Figure 9, the first insert portion 21A1 and the second insert portion 21A2 have surfaces facing the external space S1 that are exposed to the outside of the valve body 1. The partition portion 12 is formed over the entire circumference in the circumferential direction Y on the outer surface of the valve body 1 at a position L1 on one side of the E connecting passage 6e and at a position L2 on the other side of the exposed portion 21B of the lower cover 21, that is, at a position that surrounds the insert portion 21A in the circumferential direction Y (a position adjacent to the insert portion 21A in the radial direction X). As shown in Figure 10, this partition portion 12 includes a projection portion 12b that protrudes radially outward in the radial direction X from the outer surface of the valve body 1, and a support portion 12c that extends from the protruding end of the projection portion 12b along the outer surface of the valve body 1 to one side L1. The surface of the projection portion 12b facing one side L1 is opposite the surface of the connecting portion 21B1 and the surface of the second insert portion 21A2 facing the other side L2 in the axial direction L. The surface of the support portion 12c facing radially outward is opposite the inner circumferential surface 6a1 of the housing hole 6a with a gap in the radial direction X. The surface of the support portion 12c facing radially inward is opposite the surface of the first insert portion 21A1 facing radially outward in the radial direction X.

[0069] Furthermore, the sealing member 13 has one end L1 in contact with the connecting portion 21B1 and the other side L2 facing the second insert portion 21A2, and the other end L2 in contact with the one side L1 facing the protruding portion 12b. It is compressed by being pushed in the axial direction L from each of these surfaces, thereby restricting the flow of refrigerant from the valve chamber 1a into the second space S2. In other words, the sealing member 13 is provided in contact with the partition portion 12 and the outer surface of the exposed portion 21B of the connecting portion 2.

[0070] In this configuration, since the sealing member 13 is provided in contact with the partition portion 12 and the outer surface of the exposed portion 21B of the connecting portion 2, the flow of refrigerant from the valve chamber 1a into the second space S2 can be restricted by the sealing member 13 at a position close to the virtual outlet 14b. Furthermore, this restriction can be achieved by compressing the sealing member 13 in the axial direction L with the connecting portion 21B1, the second insert portion 21A2, and the protruding portion 12b. In addition, a support portion 12c is positioned between the sealing member 13 and the inner circumferential surface 6a1 of the housing hole 6a, and the sealing member 13 is positioned between the support portion 12c and the first insert portion 21A1. In a configuration without the support portion 12c, if a force is applied to the sealing member 13 radially outward due to the influence of the high-pressure valve chamber 1a, the sealing member 13 may be displaced in the same direction. As a result, as shown in Figure 10, the outer edge of the connecting portion 21B1 has an R shape, which reduces the compressive force of the sealing member 13 directed toward the other side L2, potentially leading to a decrease in airtightness. However, in this embodiment, the support portion 12c is provided, which restricts the sealing member 13 from displacing radially outward. This suppresses the decrease in the compressive force of the sealing member 13 due to the influence of the R shape of the outer edge of the connecting portion 21B1, thereby suppressing the decrease in airtightness due to the decrease in compressive force. Therefore, the sealing member 13 can stably maintain a state in which the inflow of refrigerant from the valve chamber 1a into the second space S2 is restricted.

[0071] In the modified version of the third embodiment, as shown in Figure 11, the support portion 12c of the partition portion 12 is omitted, which is different from the third embodiment. With this configuration, the number of man-hours required for processing the partition portion 12 can be reduced, and the manufacturing cost of the sliding switching valve 100 can be reduced. [Explanation of symbols]

[0072] L axis S1 External space S2 Second space X radial direction 1 Valve body 1a Valve chamber (first space) 2. Connecting part (insert member) 6a1 Inner peripheral surface (boundary surface) 13. Sealing member 14 Virtual Linkage 21B Exposed part 100 Slide-type switching valve

Claims

1. A sliding type switching valve comprising a cylindrical valve body made of resin and a cylindrical metal insert member provided by insert molding on one axial end of the valve body, A high-pressure first space is provided inside the valve body. An external space is provided outside the valve body, which is partitioned by an interface surrounding the radially outer side of the valve body. The aforementioned external space is provided with a second space where high pressure and low pressure are switched. The insert member has an inner surface of a portion of the exposed part that is located in the first space, and an outer surface of a portion of the exposed part that is located in the external space. When delamination occurs at the contact surfaces where the inner and outer surfaces of the insert member and the resin interior of the valve body come into contact with each other, and a virtual communication passage is formed with one end opening into the first space, a sealing member is provided to restrict the flow of fluid from the first space to the second space through the virtual communication passage. The sealing member is positioned between the first space and the second space. The virtual passage has a virtual entrance at one end located in the first space and a virtual exit at the other end located in the external space. A sliding type switching valve characterized in that the sealing member abuts against the outer surface of the valve body and the interface, and a third space where the virtual outlet is located is defined between the exposed portion of the insert member and the second space.

2. The sliding switching valve according to claim 1, characterized in that the sealing member is positioned to surround the insert member in the circumferential direction.

3. The portion of the outer surface of the valve body that surrounds the insert member in the circumferential direction constitutes a partition portion that protrudes toward the interface. The partition portion is provided with a groove that opens toward the interface, The sliding switching valve according to claim 2, characterized in that the sealing member is provided in contact with the bottom surface of the groove and the interface surface.

4. The slide-type switching valve according to any one of claims 1 to 3, characterized in that the exposed portion of the insert member is provided with a through hole that connects the first space and the third space.

5. A sliding type switching valve comprising a cylindrical valve body made of resin and a cylindrical metal insert member provided by insert molding on one axial end of the valve body, A high-pressure first space is provided inside the valve body. An external space is provided outside the valve body, which is partitioned by an interface surrounding the radially outer side of the valve body. The aforementioned external space is provided with a second space where high pressure and low pressure are switched. The insert member has an inner surface of a portion of the exposed part that is located in the first space, and an outer surface of a portion of the exposed part that is located in the external space. When delamination occurs at the contact surfaces where the inner and outer surfaces of the insert member and the resin interior of the valve body come into contact with each other, and a virtual communication passage is formed with one end opening into the first space, a sealing member is provided to restrict the flow of fluid from the first space to the second space through the virtual communication passage. The sealing member is positioned between the first space and the second space. The valve body is provided with an opposing surface that faces the inner surface of the insert member in the first space, A sliding type switching valve characterized in that the sealing member is positioned between the inner surface of the insert member and the opposing surface.

6. A sliding type switching valve comprising a cylindrical valve body made of resin and a cylindrical metal insert member provided by insert molding on one axial end of the valve body, A high-pressure first space is provided inside the valve body. An external space is provided outside the valve body, which is partitioned by an interface surrounding the radially outer side of the valve body. The aforementioned external space is provided with a second space where high pressure and low pressure are switched. The insert member has an inner surface of a portion of the exposed part that is located in the first space, and an outer surface of a portion of the exposed part that is located in the external space. When delamination occurs at the contact surfaces where the inner and outer surfaces of the insert member and the resin interior of the valve body come into contact with each other, and a virtual communication passage is formed with one end opening into the first space, a sealing member is provided to restrict the flow of fluid from the first space to the second space through the virtual communication passage. The sealing member is positioned between the first space and the second space. The virtual passage has a virtual entrance at one end located in the first space and a virtual exit at the other end located in the external space. The portion of the outer surface of the valve body that surrounds the insert member in the circumferential direction constitutes a partition portion that protrudes toward the interface. A sliding type switching valve characterized in that the sealing member is provided in contact with the partition portion and the outer surface of the exposed portion of the insert member.

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