Slide type switching valve and refrigeration cycle system

Abstract

To provide a slide type switching valve which can inhibit durability from being deteriorated when sliding operation of a slide valve body is repeated.SOLUTION: A slide type switching valve 10 includes: a valve housing 1 in which openings 11a at both ends of a cylindrical valve body 11 are closed with lid members 12L; and a slide valve body 2. The slide valve body 2 includes: a valve body; a piston 22L; a connection plate 23; a stopper plate 24L; and a fixing member 25. The lid member 12L includes: a bottom part 121; a cylinder part 122; and a flange part 123 in which an outer peripheral end is fixed to an opening end 11a-1 in the opening 11a of the valve body 11. The flange part 123 is provided with a plane part 123a which extends in a planar shape orthogonal to an axial direction D11 at the inner side of the opening 11a and defines an operation range of the slide valve body in the axial direction D11 by the stopper plate 24L contacting with the plane part 123a.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a sliding switching valve for switching a refrigerant flow path and a refrigeration cycle system used in a refrigeration cycle system such as an air conditioner.

Background Art

[0002] Conventionally, a sliding switching valve is known in which a slide valve body that slides by receiving a slide driving force with a piston is housed inside a valve housing in which openings at both ends of a cylindrical valve body are closed by lid members (see, for example, Patent Document 1). In the sliding switching valve described in Patent Document 1, the lid member is formed with a large-diameter portion and a small-diameter portion. The large-diameter portion is press-fitted into the opening of the valve body and is fixed by welding to the opening edge. Further, the small-diameter portion of the lid member protrudes toward the inside of the valve body, and the piston abuts against the small-diameter portion to define the operating range of the slide valve body by stopping the slide.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, in the above-described sliding switching valve, when the piston is brought into contact with the small-diameter portion of the lid member to stop the slide of the slide valve body, the piston may tilt, and there is a concern about a decrease in durability when the slide operation is repeated.

[0005] An object of the present invention is to provide a sliding switching valve capable of suppressing a decrease in durability when the slide operation of the slide valve body is repeated.

Means for Solving the Problems

[0006] The slide type switching valve of the present invention includes a valve housing in which openings at both ends of a cylindrical valve body are closed by lid members, at least a pair of pipes connected to the peripheral wall of the valve body so as to communicate with the inside of the valve body, and a slide valve body installed inside the valve body so as to be slidable in the axial direction of the valve body and switching the communication state of the pipes. The slide valve body is a valve body that switches the communication state of the pipes by sliding in the axial direction, a pair of pistons provided so as to sandwich the valve body in the axial direction and receiving the axial slide driving force, a connecting plate connecting the pair of pistons to the valve body, a stopper plate provided on the connecting plate at a position closer to the lid member than each piston and abutting against the lid member when the valve body slides to stop the slide, and a fixing member fixing the stopper plate together with the piston to the connecting plate. The lid member is located outside the opening of the valve body in the axial direction, and includes a plate-like bottom portion extending with an extending area narrower than the opening area of the opening in a direction intersecting the axial direction, a cylindrical portion extending from the peripheral edge of the bottom portion toward the opening in the axial direction, and a flange portion extending in a flange shape from the edge of the cylindrical portion on the side of the opening of the valve body toward the outside of the cylindrical portion, and an outer peripheral end portion of which is fixed to an opening end surrounding the opening in the valve body. The flange portion is provided with a flat portion extending in a planar shape toward the center side of the opening in a direction intersecting the axial direction and defining the axial operating range of the slide valve body by abutting the stopper plate. The flat portion extends in an annular shape, and the flange portion is provided with a curved surface portion connecting the inner peripheral surface of the cylindrical portion and the flat portion.

[0007] In this slide type switching valve, the operating range of the slide valve body is defined by bringing the stopper plate of the slide valve body into contact with the flat surface portion formed on the flange portion of the lid member. According to this configuration, the piston that receives the slide driving force does not come into contact with the lid member and receive force during sliding. Further, since the contact destination of the stopper plate is a flat surface portion orthogonal to the axial direction of the valve body, the contact between the stopper plate and the flat surface portion is also stably performed. As a result, the inclination of the piston at the time of contact is suppressed, and it is possible to suppress a decrease in durability when the slide operation of the slide valve body is repeated.

[0008] Here, a curved surface portion connecting the inner peripheral surface of the cylindrical portion and the flat surface portion is provided on the flange portion, and it is preferable that the curved surface portion is located closer to the center of the cylindrical portion than the outer peripheral surface of the cylindrical portion in a plan view from the direction facing the bottom portion.

[0009] According to this configuration, compared with the case where the curved surface portion extends further outside the outer peripheral surface of the cylindrical portion in the flange portion, the flat surface portion in the flange portion can be made larger. Thereby, the contact of the stopper plate with the flat surface portion becomes more stable, so that it is possible to further suppress a decrease in durability when the slide operation of the slide valve body is repeated. Further, since the flat surface portion can be made large without changing the outer diameter size of the flange portion, the entire flange portion can be made small.

[0010] Further, the fixing member in the slide valve body has a protruding portion that protrudes from the stopper plate toward the lid member, and it is preferable that the protruding portion is located in the internal space defined by the bottom portion and the cylindrical portion in the lid member in a state where the stopper plate is in contact with the flat surface portion of the flange portion.

[0011] According to this configuration, in a state where the stopper plate abuts against the flat portion of the flange portion, the flange portion of the lid member and the protruding portion of the fixing member do not interfere with each other. For this reason, a spacer or the like for avoiding contact between the flat portion and the protruding portion of the fixing member is unnecessary, and it is possible to stabilize the contact of the stopper plate with respect to the flat portion while reducing the number of parts. That is, according to the above configuration, it is possible to suppress a decrease in durability when the sliding operation of the slide valve body is repeated while reducing the number of parts.

[0012] Further, a stepped portion recessed toward the bottom side in the axial direction of the valve body is provided at a position on the outer peripheral side of the flange portion rather than the flat portion at the outer peripheral end portion of the flange portion. The stepped portion has a first surface extending in the intersecting direction with respect to the axial direction and a second surface extending in the axial direction, and it is preferable that the open end of the valve body abuts against the first surface of the stepped portion.

[0013] According to this configuration, at the time of assembly, by housing the open end of the valve body in the stepped portion, the positioning of the lid member with respect to the opening of the valve body is performed, so that the workability of joining the lid member to the opening of the valve body is improved, and this joining can be easily performed.

[0014] Furthermore, it is more preferable that the valve body is a cylindrical member and the second surface of the stepped portion is a cylindrical surface formed with a diameter dimension equal to or smaller than the inner diameter dimension of the valve body.

[0015] According to this configuration, at the time of assembly, the open end of the valve body can be housed in the stepped portion without press-fitting the second surface of the stepped portion into the opening of the valve body. As a result, a situation where the valve body is deformed during assembly and the lid member is tilted and assembled is effectively avoided. As a result, the inclination of the piston at the time of contact is further suppressed, and a decrease in durability when the sliding operation of the slide valve body is repeated can be further suppressed. Also, according to the above configuration, the depth dimension in the axial direction of the stepped portion can be minimized because a press-fitting allowance for press-fitting is not required, and the processing of the stepped portion can be facilitated.

[0016] Further, it is more preferable that the stepped portion is a portion where the thickness is thinner than the plate portion having the flat portion in the flange portion.

[0017] According to this configuration, for example, the stepped portion can be easily formed by cutting or the like as compared with the case where the stepped portion is formed by deforming the outer peripheral end portion in the axial direction while keeping the thickness of the flange portion as it is.

[0018] Further, it is more preferable that chamfering is formed on the inner peripheral side of the opening end of the valve body.

[0019] According to this configuration, even if a corner R is formed at the boundary between the first surface and the second surface in the stepped portion, the opening end of the valve body can be stably brought into contact with the first surface in the stepped portion while avoiding the corner R by chamfering. As a result, a situation where the lid member is assembled to the valve body in an inclined state during assembly or the like is effectively avoided. As a result, the inclination of the piston at the time of contact is further suppressed, and a decrease in durability when the sliding operation of the slide valve body is repeated can be further suppressed.

[0020] Further, the refrigeration cycle system of the present invention includes a compressor that compresses a refrigerant that is a fluid, a first heat exchanger that functions as a condenser in the cooling mode, a second heat exchanger that functions as an evaporator in the cooling mode, expansion means that expands and decompresses the refrigerant between the first heat exchanger and the second heat exchanger, and the above-described slide type switching valve.

[0021] According to this refrigeration cycle system, since the above-described slide type switching valve is provided, a decrease in durability when the sliding operation of the slide valve body is repeated can be suppressed.

Effects of the Invention

[0022] According to the slide type switching valve and the refrigeration cycle system of the present invention, a decrease in durability when the sliding operation of the slide valve body is repeated can be suppressed.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

MODE FOR CARRYING OUT THE INVENTION

[0024] Hereinafter, the slide type switching valve according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

[0025] FIG. 1 is a cross-sectional view showing a cross-section along the axial direction of the valve housing of the slide type switching valve according to the first embodiment. FIG. 2 is an enlarged view showing the region A11 in FIG. 1 in a state before welding, and FIG. 3 is a view showing the region A12 in FIG. 2 in a state after welding. Further, FIG. 4 is an exploded view of the lid member, the stopper plate of the slide valve body, and the piston shown in FIG. 1, and FIG. 5 is a schematic view showing a refrigeration cycle system including the slide type switching valve shown in FIGS. 1 to 4. In the following description, in FIGS. 1 and 5, the side where the E joint pipe 13e is shown is referred to as the left side, and the side where the C joint pipe 13c is shown is referred to as the right side. In FIGS. 2 and 4, the side where the lid member 12L is shown is referred to as the left side, and the side where the piston 22L is shown is referred to as the right side. In FIG. 3, the side where the flange portion 123 is shown is referred to as the left side, and the side where the valve body 11 is shown is referred to as the right side.

[0026] As shown in Fig. 1, the slide type switching valve 10 of the present embodiment is a four-way switching valve that switches the communication state of four pipes, and has a structure including a slide valve body 2 in a valve housing 1.

[0027] The valve housing 1 is a cylindrical member with both ends closed, and is composed of a cylindrical valve body 11 and two lid members 12L and 12R. The lid members 12L and 12R are attached to the valve body 11 so as to close the openings 11a at both ends of the valve body 11. In the present embodiment, the lid members 12L and 12R are fixed to the valve body 11 by welding. Regarding these lid members 12L and 12R, the state before welding is shown in Fig. 2, and the state after welding is shown in Fig. 3. The valve body 11 and the lid members 12L and 12R are made of metal such as stainless steel or brass. Examples of fixing methods for such metal members include welding and brazing. When welding is adopted as in the present embodiment, it is preferable that the valve body 11 and the lid members 12L and 12R, which are the objects to be fixed, are made of stainless steel. Also, the central axes of the valve body 11 and the lid members 12L and 12R coincide with the axis X of the valve housing 1. Four pipes, namely a D joint pipe 13d, an E joint pipe 13e, an S joint pipe 13s, and a C joint pipe 13c, which will be described in detail later, are connected to the peripheral wall of the valve housing 1 so as to communicate with the inside of the valve housing 1.

[0028] A valve seat 15 on which the slide valve body 2 slides is provided on the inner peripheral surface of the valve body 11. This valve seat 15 is disposed in the middle part of the valve body 11, and a D joint pipe 13d as a high-pressure pipe that opens into the valve body 11 is attached at a position facing the valve seat 15 in the middle part of the valve body 11. Also, the valve seat 15 is attached with an E joint pipe 13e and a C joint pipe 13c as a pair of conduits and an S joint pipe 13s as a low-pressure pipe, which are arranged in a straight line in the direction of the axis X of the valve housing 1.

[0029] The slide valve body 2 is a member that is installed inside the valve main body 11 so as to be slidable in the axial direction D11 of the valve main body 11 and switches the communication state of the above four pipes. This slide valve body 2 includes a valve body 21, a pair of pistons 22L and 22R, a connecting plate 23, a pair of stopper plates 24L and 24R, and a fixing member 25.

[0030] The valve body 21 switches the communication state of the above four pipes by sliding in the axial direction D11. A bowl-shaped recess 21A is formed inside the valve body 21. And at the end position on the left side of FIG. 1, the valve body 21 connects the S joint pipe 13s and the E joint pipe 13e through the bowl-shaped recess 21A. At this time, the C joint pipe 13c communicates mainly with the D joint pipe 13d through the through hole 23a of the connecting plate 23 in the high-pressure chamber 11A partitioned by the pair of pistons 22L and 22R inside the valve housing 1. Also, at the end position on the right side where the slide valve body 2 moves to the right in FIG. 1, the valve body 21 connects the S joint pipe 13s and the C joint pipe 13c through the bowl-shaped recess 21A. At this time, the E joint pipe 13e communicates mainly with the D joint pipe 13d through the through hole 23a in the high-pressure chamber 11A.

[0031] A pair of pistons 22L and 22R are provided in a pair so as to sandwich the valve body 21 in the axial direction D11 and receive the sliding driving force in the axial direction D11. Each of the pistons 22L and 22R is reciprocally movable while pressing the packing 221 against the inner peripheral surface of the valve body 11. The interior of the valve housing 1 is partitioned by the two pistons 22L and 22R into a high-pressure chamber 11A at the central portion and a first working chamber 12A and a second working chamber 12B located on both sides of the high-pressure chamber 11A. Driving fluid flows into the first working chamber 12A and the second working chamber 12B from the pilot valve 3 shown in FIG. 5, and the pair of pistons 22L and 22R receive the sliding driving force via the driving fluid. The pair of pistons 22L and 22R have a mirror-symmetrical structure as shown in FIG. 1. The pistons 22L and 22R each include a packing 221, a fixed disk 222, and a leaf spring 223. The packing 221, the fixed disk 222, and the leaf spring 223 are coaxially arranged about the axis X together with the stopper plates 24L and 24R described later and are integrally fixed by rivets 224. In the present embodiment, the leaf spring 223 and the stopper plates 24L and 24R are made of metal such as stainless steel, and the packing 221 is made of a resin having a relatively low coefficient of friction such as polytetrafluoroethylene (PTFE).

[0032] The connecting plate 23 is a metal plate that connects the pair of pistons 22L and 22R to the valve body 21. This connecting plate 23 is installed between the pistons 22L and 22R so as to be disposed on the axis X of the valve housing 1 and holds the valve body 21 at its center. Further, a through hole 23a is formed in the connecting plate 23. Then, when the pistons 22L and 22R move, the valve body 21 slides on the valve seat 15 in conjunction with the connecting plate 23 and stops at the left and right positions where the stopper plates 24L and 24R provided together with the pistons 22L and 22R abut against the lid members 12L and 12R. Also, in the present embodiment, this connecting plate 23 is made of metal such as stainless steel.

[0033] Each stopper plate 24L, 24R is a circular plate member provided on the connecting plate 23 so as to be closer to the lid members 12L, 12R than the respective pistons 22L, 22R, and abuts against the lid members 12L, 12R when the valve body 21 slides to stop the slide.

[0034] The fixing member 25 is a bolt that fixes the respective stopper plates 24L, 24R together with the respective pistons 22L, 22R at both ends of the connecting plate 23 in the axial direction D11. Both ends of the connecting plate 23 are bent in an L shape so as to be orthogonal to the axial direction D11, and serve as fixing portions 231 for fixing the respective pistons 22L, 22R and the respective stopper plates 24L, 24R. Together with the respective pistons 22L, 22R, the respective stopper plates 24L, 24R are bolted by the fixing member 25 in an orthogonal posture with respect to the axial direction D11 while abutting against the fixing portion 231 of the connecting plate 23.

[0035] In the refrigeration cycle system 30 shown in FIG. 5, the D joint pipe 13d is a high-pressure pipe connected to the discharge port of the compressor 31, and the S joint pipe 13s is a low-pressure pipe connected to the suction port of the compressor 31. The C joint pipe 13c is a conduit connected to the outdoor heat exchanger 32 (first heat exchanger), and the E joint pipe 13e is a conduit connected to the indoor heat exchanger 33 (second heat exchanger). The outdoor heat exchanger 32 and the indoor heat exchanger 33 are connected via a throttling device 34 (expansion means). The refrigeration cycle system 30 is constituted by a path including the outdoor heat exchanger 32, the throttling device 34, the indoor heat exchanger 33, and the E joint pipe 13e from the C joint pipe 13c, and a path including the compressor 31 from the S joint pipe 13s and the D joint pipe 13d. Note that a small amount of refrigeration oil is contained in the refrigerant in the refrigeration cycle system 30 for the protection of the compressor 31 and other devices.

[0036] The pilot valve 3 shown in Fig. 5 allows the driving fluid to flow through a pair of spaces sandwiching the slide valve body 2 in the axial direction D11 inside the valve housing 1, that is, both the first working chamber 12A and the second working chamber 12B, to slide the slide valve body 2 in the axial direction D11. In this embodiment, this pilot valve 3 slides the slide valve body 2 by allowing the fluid in the D joint pipe 13d as the high-pressure pipe to flow through one of the first working chamber 12A and the second working chamber 12B and allowing the fluid in the S joint pipe 13s as the low-pressure pipe to flow through the other.

[0037] The pilot valve 3 has the same structure as the slide type switching valve 10, and switches the flow path by sliding the pilot valve body inside the pilot valve housing. The pilot valve body switches the communication destination of the low-pressure joint pipe 14s communicating with the S joint pipe 13s as the low-pressure pipe connected to the suction port of the compressor 31 as follows. That is, the pilot valve body switches the communication destination of the low-pressure joint pipe 14s between the first housing pipe 14L connected to the first working chamber 12A of the slide type switching valve 10 and the second housing pipe 14R connected to the second working chamber 12B. At the same time, the communication destination of the high-pressure joint pipe 14d communicating with the D joint pipe 13d as the high-pressure pipe connected to the discharge port of the compressor 31 is switched between the second housing pipe 14R and the first housing pipe 14L. Thereby, a pressure difference is generated between the pressure in the first working chamber 12A into which the suction pressure and the discharge pressure of the compressor 31 are introduced and the pressure in the second working chamber 12B, and due to this pressure difference, the slide valve body 2 is slid in the axial direction D11 from the high-pressure side to the low-pressure side. Then, by this sliding movement, the position of the valve body 21 in the slide valve body 2 is switched and the flow path of the refrigeration cycle system 30 is switched.

[0038] With the above configuration, the high-pressure refrigerant compressed by the compressor 31 flows into the high-pressure chamber 11A from the D joint pipe 13d. In the state of the cooling operation (during the cooling mode), the high-pressure refrigerant flows into the outdoor heat exchanger 32 from the C joint pipe 13c. Also, in the state of the heating operation (during the heating mode) where the position of the valve body 21 is switched, the high-pressure refrigerant flows into the indoor heat exchanger 33 from the E joint pipe 13e. That is, during the cooling operation, the refrigerant discharged from the compressor 31 circulates as C joint pipe 13c → outdoor heat exchanger 32 → throttling device 34 → indoor heat exchanger 33 → E joint pipe 13e. In this circulation, the outdoor heat exchanger 32 functions as a condenser, and the indoor heat exchanger 33 functions as an evaporator, and cooling is performed. The throttling device 34 expands and depressurizes the refrigerant between the outdoor heat exchanger 32 and the indoor heat exchanger 33. Also, during the heating operation, the refrigerant circulates in the reverse direction, the indoor heat exchanger 33 functions as a condenser, and the outdoor heat exchanger 32 functions as an evaporator, and heating is performed.

[0039] Here, in the present embodiment, the pair of lid members 12L, 12R has the following configuration. Note that the pair of lid members 12L, 12R has a structure that is mirror-symmetrical as shown in FIG. 1. Hereinafter, the left lid member 12L, which is enlarged and shown in FIGS. 2 and 4, will be taken as a representative example, and its structure will be described.

[0040] The lid member 12L is a bottomed cylindrical member including a bottom portion 121, a cylindrical portion 122, and a flange portion 123. The bottom portion 121 is located outside the opening 11a of the valve body 11 in the axial direction D11 of the valve body 11, and is a plate-like portion extending with an extending area narrower than the opening area of the opening 11a in the intersecting direction D12 with respect to the axial direction D11. That is, the bottom portion 121 is formed in a disc shape with a smaller diameter than the inner diameter dimension φ11 of the opening 11a, and is a portion that is coaxial with and located outside the opening 11a. The cylindrical portion 122 is a cylindrical portion extending from the peripheral edge of the bottom portion 121 toward the opening 11a in the axial direction D11. The outer diameter of this cylindrical portion 122 is also smaller than the inner diameter dimension φ11 of the opening 11a. The flange portion 123 is a portion extending in a flange shape radially outward from the edge on the side of the opening 11a of the valve body 11 in the cylindrical portion 122. This flange portion 123 extends in an annular shape from the inner side of the opening 11a radially outward to the same diameter as the outer diameter of the opening 11a. And, by fixing the outer peripheral end portion of this flange portion 123 to the opening end 11a-1 surrounding the opening 11a in the valve body 11, the lid member 12L closes the opening 11a of the valve body 11. Further, in the present embodiment, the first housing capillary 14L is connected so as to penetrate the peripheral wall of the cylindrical portion 122 and reach the first working chamber 12A. And, on the above flange portion 123, a flat portion 123a extending in a planar shape toward the center side of the opening 11a (specifically, the radially inner side of the circular opening 11a) in the intersecting direction D12 with respect to the axial direction D11 is provided. The flat portion 123a is orthogonal to the axial direction D11. This flat portion 123a is an annular portion that defines the operating range of the slide valve body 2 in the axial direction D11 by abutting the stopper plate 24L. The operating range of the slide valve body 2 is the range from the position where the left stopper plate 24L abuts on the flat portion 123a in the left lid member 12L to the position where the right stopper plate 24R abuts on the flat portion 123a in the right lid member 12R.

[0041] Here, in the present embodiment, the above-described fixing member 25 in the slide valve body 2 is a bolt attached so as to penetrate the stopper plate 24L from the side of the lid member 12L, and the bolt head serves as a protruding portion 251 that protrudes from the stopper plate 24L toward the lid member 12L. This protruding portion 251 is configured to be located in the internal space 124 defined by the bottom portion 121 and the cylindrical portion 122 in the lid member 12L when the stopper plate 24L abuts against the flat surface portion 123a of the flange portion 123.

[0042] Also, in the present embodiment, the flange portion 123 is provided with a curved surface portion 123b that connects the inner peripheral surface 122a of the cylindrical portion 122 and the flat surface portion 123a. The flat surface portion 123a is subjected to pressing (surface hitting) or cutting, and the curved surface portion 123b is made smaller. This curved surface portion 123b is located closer to the center of the cylindrical portion 122 than the outer peripheral surface 122b of the cylindrical portion 122 in a plan view from the direction facing the bottom portion 121. Further, by the pressing (surface hitting) or cutting applied to the flat surface portion 123a, the flatness of the flat surface portion 123a can be ensured, and the inclination of the pistons 22L and 22R can be further suppressed. Furthermore, an annular step portion 123c that is recessed toward the bottom portion 121 in the axial direction D11 of the valve body 11 is provided at a position on the outer peripheral side of the flat surface portion 123a at the outer peripheral end portion of the flange portion 123. This step portion 123c has an annular first surface 123c-1 that extends in the intersecting direction D12 with respect to the axial direction D11 and a cylindrical second surface 123c-2 that extends in the axial direction D11. The open end 11a-1 of the valve body 11 abuts against the first surface 123c-1 of this step portion 123c and is fixed by welding. As a result, as shown in FIG. 3, a welded portion 125 is formed over the entire circumference at the boundary between the flange portion 123 and the valve body 11. Also, the second surface 123c-2 of the step portion 123c is a cylindrical surface formed with a diameter dimension φ12 that is equal to or smaller than the inner diameter dimension φ11 of the valve body 11.

[0043] In addition, in the present embodiment, the stepped portion 123c is a portion where the thickness is reduced, for example, by cutting or the like, compared to the plate portion having the flat portion 123a in the flange portion 123. Further, in the present embodiment, chamfers 11a-2 are formed on the inner peripheral side of the open end 11a-1 of the valve body 11, and chamfers 11a-3 are also formed on the outer peripheral side.

[0044] In the sliding switching valve 10 and the refrigeration cycle system 30 of the first embodiment described above, the operating range of the slide valve body 2 is defined by bringing the stopper plates 24L and 24R of the slide valve body 2 into contact with the flat portions 123a formed in the flange portions 123 of the lid members 12L and 12R. According to this configuration, the pistons 22L and 22R that receive the sliding driving force do not come into contact with the lid members 12L and 12R and receive force during sliding. Further, since the contact destinations of the stopper plates 24L and 24R are the flat portions 123a orthogonal to the axial direction D11 of the valve body 11, the contact between the stopper plates 24L and 24R and the flat portions 123a is also stably performed. As a result, the inclination of the pistons 22L and 22R at the time of contact is suppressed, and it is possible to suppress a decrease in durability when the sliding operation of the slide valve body 2 is repeated.

[0045] Here, in the present embodiment, the curved surface portion 123b provided in the flange portion 123 is located closer to the center of the cylindrical portion 122 than the outer peripheral surface 122b of the cylindrical portion 122. According to this configuration, compared to the case where the curved surface portion 123b in the flange portion 123 extends further outside the outer peripheral surface 122b of the cylindrical portion 122, the flat portion 123a in the flange portion 123 can be made larger. As a result, the contact of the stopper plates 24L and 24R with the flat portion 123a becomes more stable, so that a decrease in durability when the sliding operation of the slide valve body 2 is repeated can be further suppressed. Further, since the flat portion 123a can be made larger without changing the outer diameter size of the flange portion 123, the entire flange portion 123 can be made smaller.

[0046] In addition, in the present embodiment, the protruding portion 251 of the fixing member 25 is located in the internal space 124 of the lid members 12L and 12R when the stopper plates 24L and 24R abut against the flat portion 123a. According to this configuration, when the above-mentioned abutment occurs, the flange portions 123 of the lid members 12L and 12R and the protruding portion 251 of the fixing member 25 do not interfere with each other. Therefore, a spacer or the like for avoiding contact between the flat portion 123a and the protruding portion 251 of the fixing member 25 is unnecessary, and the contact of the stopper plates 24L and 24R with the flat portion 123a can be stabilized while reducing the number of parts. That is, according to the above configuration, it is possible to suppress a decrease in durability when the sliding operation of the slide valve body 2 is repeated while reducing the number of parts.

[0047] In addition, since the flat portion 123a of the flange portion 123 abuts against the outer peripheral ends of the stopper plates 24L and 24R in an annular shape, the inclination of the pistons 22L and 22R at the time of abutment is further suppressed. As a result, it is possible to further suppress a decrease in durability when the sliding operation of the slide valve body 2 is repeated.

[0048] In addition, in the present embodiment, a stepped portion 123c is provided at the outer peripheral end of the flange portion 123, and the opening end 11a-1 of the valve body 11 abuts against the first surface 123c-1 of the stepped portion 123c. According to this configuration, at the time of assembly, by accommodating the opening end 11a-1 of the valve body 11 in the stepped portion 123c, the lid members 12L and 12R are positioned with respect to the opening 11a of the valve body 11. As a result, the workability of joining the lid members 12L and 12R to the opening 11a of the valve body 11 is improved, and this joining can be easily performed.

[0049] Further, in the present embodiment, the second surface 123c-2 of the stepped portion 123c is a cylindrical surface formed with a diameter dimension φ12 that is equal to or less than the inner diameter dimension φ11 of the valve body 11. According to this configuration, at the time of assembly, the opening end 11a-1 of the valve body 11 can be received in the stepped portion 123c without press-fitting the second surface 123c-2 of the stepped portion 123c into the opening 11a of the valve body 11. As a result, a situation where the valve body 11 is deformed during assembly and the lid members 12L and 12R are assembled in a tilted state can be effectively avoided. In the present embodiment, welding is used for fixing the lid member 12. Generally, in the case of welding and fixing to a press-fitted portion, due to the residual stress of press-fitting and the heat of welding, the object to be fixed is likely to be in a tilted state. In contrast, in the present embodiment, as described above, at the time of assembly, the opening end 11a-1 of the valve body 11 is received in the stepped portion 123c without press-fitting the second surface 123c-2 of the stepped portion 123c into the opening 11a of the valve body 11. As a result, the inclination of the pistons 22L and 22R at the time of contact is further suppressed, and a further reduction in durability when the sliding operation of the slide valve body 2 is repeated can be suppressed. Further, according to the above configuration, the depth dimension in the axial direction D11 of the stepped portion 123c may be the minimum depth dimension because no press-fitting allowance for press-fitting is required, and the processing of the stepped portion 123c can be facilitated.

[0050] Further, in the present embodiment, the stepped portion 123c is a portion where the thickness is thinner than other plate portions in the flange portion 123. According to this configuration, for example, the stepped portion 123c can be easily formed by cutting or the like as compared with the case where the outer peripheral end portion is deformed in the axial direction D11 while keeping the thickness of the flange portion 123 as it is to form the stepped portion 123c.

[0051] Further, in the present embodiment, as shown in FIG. 2, a corner R123c-3 is formed at the boundary between the first surface 123c-1 and the second surface 123c-2 in the stepped portion 123c. On the other hand, in the present embodiment, a chamfer 11a-2 is formed on the inner peripheral side of the open end 11a-1 of the valve body 11. According to this configuration, the open end 11a-1 of the valve body 11 can be stably brought into contact with the first surface 123c-1 in the stepped portion 123c while avoiding the corner R123c-3 with the chamfer 11a-2. As a result, a situation where the lid members 12L and 12R are assembled to the valve body 11 in a tilted state during assembly is effectively avoided. As a result, the inclination of the pistons 22L and 22R at the time of contact is further suppressed, and a further reduction in durability when the sliding operation of the slide valve body 2 is repeated can be suppressed.

[0052] This concludes the description of the first embodiment. Next, the second embodiment will be described with reference to FIG. 6. This second embodiment is a modification of the flange portion 123 of the lid members 12L and 12R in the first embodiment. Hereinafter, the second embodiment will be described while focusing on the differences from the first embodiment. Also, since the refrigeration cycle system is the same as that of the first embodiment, illustration and description thereof are omitted.

[0053] FIG. 6 is a cross-sectional view showing a cross-section along the axial direction of the valve housing of the slide type switching valve according to the second embodiment. In FIG. 6, the same components as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals as in FIG. 1 only when necessary for explanation. In the following description, in FIG. 6, the side where the lid member 52L is shown is referred to as the left side, and the side where the lid member 52R is shown is referred to as the right side.

[0054] In the sliding switching valve 50 of the second embodiment, the lid members 52L and 52R that close both ends of the valve body 11 in the valve housing 5 have the following configuration. Each of the lid members 52L and 52R has a bottom portion 121 and a cylindrical portion 122 equivalent to those of the first embodiment, and also has a flange portion 523 as a modification to the first embodiment. In this flange portion 523, a stepped portion 523c for accommodating the open end 11a-1 of the valve body 11 is formed by a deformation process such as press deformation in the axial direction D11, rather than by the thin-walled processing as in the first embodiment. As a result, the back side of the stepped portion 523c in the flange portion 523 has become a bulging portion 523d that bulges to the left side in FIG. 6 away from the valve body 11 in the axial direction D11 according to the recess on the right side in FIG. 6 of the stepped portion 523c. A part of the bulging portion 523d on the axis X side is formed so as to overlap with a flat surface portion 523a against which the stopper plates 24L and 24R of the slide valve body 2 abut, and the abutting strength is enhanced. Also in this embodiment, similar to the above-described first embodiment, the flange portion 523 is fixed to the valve body 11 by welding, and a welded portion 525 is formed over the entire circumference at the boundary between the flange portion 523 and the valve body 11.

[0055] Needless to say, also according to the second embodiment described above, similar to the above-described first embodiment, it is possible to suppress a decrease in durability when the sliding operation of the slide valve body 2 is repeated.

[0056] Note that the first and second embodiments described above merely show typical forms of the present invention, and the present invention is not limited thereto. That is, various modifications can be made and implemented without departing from the gist of the present invention. As long as the configuration of the sliding switching valve of the present invention is provided even by such modifications, of course, it is included in the scope of the present invention.

[0057] For example, in the above-described first and second embodiments, as an example of the slide-type switching valve, the slide-type switching valves 10 and 50 as four-way switching valves for switching the communication state of four pipes are illustrated. However, the slide-type switching valve is not limited to a four-way switching valve. As long as at least a pair of pipes is connected to the valve housing, the slide-type switching valve may be a three-way switching valve that switches the pipes to be communicated when communicating a pair of pipes among, for example, three pipes, using a slide valve body. Alternatively, it may be a two-way switching valve that opens and closes between two pipes using a slide valve body. Regarding the number of pipes in the slide-type switching valve, the method of switching the communication state, etc., can be appropriately set according to the application target of the slide-type switching valve, etc.

[0058] Also, in the above-described first and second embodiments, as an example of the lid member, the lid members 12L, 12R, 52L, and 52R in which the bent surface portion 123b is provided closer to the center than the outer peripheral surface 122b of the cylindrical portion 122 on the flange portions 123 and 523 are illustrated. However, the lid member is not limited thereto, and it may not have any bent surface portion, or even when a bent surface portion is provided, the bent surface portion may be provided so as to extend further outside the outer peripheral surface of the cylindrical portion. However, as described above, by providing the bent surface portion 123b closer to the center than the outer peripheral surface 122b of the cylindrical portion 122, it is possible to further suppress a decrease in durability when the sliding operation of the slide valve body 2 is repeated. Also, as described above, by providing the bent surface portion 123b as described above, the flange portion 123 as a whole can be made smaller.

[0059] In the above-described first and second embodiments, as an example of the slide-type switching valve, the slide-type switching valves 10 and 50 in which the protruding portion 251 of the fixed member 25 is located in the internal space 124 of the lid members 12L, 12R, 52L, and 52R when the stopper plates 24L and 24R are in contact are illustrated. Also, in the first and second embodiments, a bolt is adopted as the fixed member 25. However, the slide-type switching valve is not limited to this. For example, a rivet or the like other than a bolt may be used as the fixed member. Further, the protruding portion of the fixed member from the stopper plate may not fit into the internal space of the lid member, and a spacer or the like may be used to avoid contact between the protruding portion and the lid member. However, according to the configuration in which the protruding portion 251 of the fixed member 25 is housed in the internal space 124 of the lid members 12L, 12R, 52L, and 52R, as described above, it is possible to suppress a decrease in durability when the sliding operation of the slide valve body 2 is repeated while reducing the number of parts.

[0060] In the above-described first and second embodiments, as an example of the lid member, the lid members 12L, 12R, 52L, and 52R in which the open end 11a-1 of the valve body 11 abuts on the first surface 123c-1 of the stepped portions 123c and 523c in the flange portions 123 and 523 are illustrated. However, the lid member is not limited to this, and it may be configured such that no stepped portion is provided on the flange portion. However, according to the configuration in which the open end 11a-1 of the valve body 11 is brought into contact with the first surface 123c-1 of the stepped portions 123c and 523c, as described above, it is possible to easily join the lid members 12L, 12R, 52L, and 52R to the opening 11a of the valve body 11.

[0061] In addition, in the above-described first and second embodiments, as an example of the stepped portion in the lid member, the stepped portions 123c and 523c are exemplified, in which the second surface 123c-2 is a cylindrical surface formed with a diameter dimension φ12 that is equal to or less than the inner diameter dimension φ11 of the valve body 11. However, the stepped portion in the lid member is not limited to this, and the second surface may be a cylindrical surface formed with a diameter dimension that exceeds the inner diameter dimension of the valve body, and the lid having this stepped portion may be press-fitted into the opening of the valve body. However, by adopting the stepped portions 123c and 523c in which the second surface 123c-2 is a cylindrical surface formed with a diameter dimension φ12 that is equal to or less than the inner diameter dimension φ11 of the valve body 11, the deformation of the valve body 11 during assembly can be effectively avoided as described above. Also, as described above, since no press-fitting cost is required, the processing of the stepped portion 123c can be facilitated.

[0062] In addition, in the above-described first embodiment, as an example of the stepped portion in the lid member, the stepped portion 123c, which is thinner than the other plate portions in the flange portion 123, is exemplified. However, the stepped portion in the lid member is not limited to this, and for example, as exemplified in the second embodiment, it may have the same thickness as the other plate portions in the flange portion 523 or may be thicker than the other plate portions. As described above, the thinner stepped portion 123c can be easily formed by cutting or the like.

[0063] In addition, in the above-described first and second embodiments, as an example of the opening end of the valve body housed in the stepped portion of the lid member, the opening end 11a-1 of the valve body 11, in which a chamfer 11a-2 is formed on the inner peripheral side, is exemplified. However, the opening end of the valve body is not limited to this, and it may not have any chamfer formed on the inner peripheral side. However, by forming the chamfer 11a-2 on the inner peripheral side of the opening end 11a-1 of the valve body 11, the corner R123c-3 in the stepped portions 123c and 523c can be effectively avoided by the chamfer 11a-2 as described above. Also, in the above-described first and second embodiments, a form in which a chamfer 11a-3 is also formed on the outer peripheral side of the opening end 11a-1 of the valve body 11 is exemplified, but a chamfer may be provided only on the inner peripheral side of the opening end.

Description of Symbols

[0064] 1,5-valve housing 2-slide valve body 10,50-slide type changeover valve 11-valve body 11A-high pressure chamber 11a-opening 11a-1-opening end 11a-2,11a-3-chamfer 12L,12R,52L,52R-cover member 12A-first operating chamber 12B-second operating chamber 13c-C coupling pipe 13d-D coupling pipe 13e-E coupling pipe 13s-S coupling pipe 14L-fine pipe for the first housing 14R-fine pipe for the second housing 14d-fine pipe for high pressure coupling 14s-fine pipe for low pressure coupling 15-valve seat 21-valve body 21A-bowl-shaped recess 22L,22R-piston 23-connecting plate 23a-through hole 24L,24R-stop plate 25-fixing member 30-refrigeration cycle system 31-compressor 32-outdoor heat exchanger (first heat exchanger) 33-indoor heat exchanger (second heat exchanger) 121-bottom part 122-cylindrical part 122a-inner circumferential surface 122b-outer circumferential surface 123,523-flange part 123a,523a-planar part 123b-curved surface part 123c,523c-step part 123c-1-first surface 123c-2-second surface 123c-3 corner R 124 Internal space 125, 525 Weld part 221 Packing 222 Fixed disk 223 Leaf spring 224 Rivet 231 Fixed part 251 Protrusion 523d Bulge D11 Axial direction D12 Crossing direction X-axis φ11 Inner diameter dimension φ12 Diameter dimension

Claims

1. A valve housing in which openings at both ends of a cylindrical valve body are closed by lid members, At least a pair of pipes connected to the peripheral wall of the valve body so as to communicate with the inside of the valve body, Inside the valve body, a slide valve body is installed slidably in the axial direction of the valve body to switch the communication state of the pipes, The slide valve body is, A valve body that switches the communication state of the pipes by sliding in the axial direction, A pair of pistons provided so as to sandwich the valve body in the axial direction and receiving the axial sliding driving force, A connecting plate connecting the pair of pistons to the valve body, A stopper plate provided on the connecting plate at a position closer to the lid member than each piston, and contacting the lid member when the valve body slides to stop the slide, A fixing member for fixing the stopper plate to the connecting plate together with the piston, The lid member is, A plate-like bottom portion located outside the opening of the valve body in the axial direction and extending with an extending area narrower than the opening area of the opening in a direction intersecting the axial direction, A cylindrical portion extending from the peripheral edge of the bottom portion toward the opening in the axial direction, A flange portion extending in a flange shape from the edge of the cylindrical portion on the side of the opening of the valve body toward the outside of the cylindrical portion, and an outer peripheral end portion thereof is fixed to an opening end surrounding the opening in the valve body, The flange portion is provided with a flat portion that extends in a planar shape toward the center side of the opening in a direction intersecting the axial direction, and defines the axial operating range of the slide valve body by contacting the stopper plate, The flat portion extends annularly, The flange portion is provided with a curved surface portion connecting the inner peripheral surface of the cylindrical portion and the flat portion, and is a slide type switching valve characterized by this.

2. The flange portion is provided with a curved surface portion connecting the inner peripheral surface of the cylindrical portion and the flat portion, The slide type switching valve according to claim 1, wherein the curved surface portion is located closer to the center of the cylindrical portion than the outer peripheral surface of the cylindrical portion in a plan view from a direction facing the bottom portion.

3. The fixing member in the slide valve body has a protruding portion protruding from the stopper plate toward the lid member, The slide type switching valve according to claim 1 or 2, wherein the protruding portion is located in an internal space defined by the bottom portion and the cylindrical portion of the lid member in a state where the stopper plate is in contact with the flat portion of the flange portion.

4. On the outer peripheral end of the flange portion, at a position on the outer peripheral side of the flat portion, a stepped portion recessed toward the bottom side in the axial direction of the valve body is provided. The stepped portion has a first surface extending in the intersecting direction with respect to the axial direction and a second surface extending in the axial direction. The slide type switching valve according to any one of claims 1 to 3, characterized in that the open end of the valve body abuts on the first surface of the stepped portion.

5. The valve body is a cylindrical member. The slide type switching valve according to claim 4, characterized in that the second surface of the stepped portion is a cylindrical surface formed with a diameter dimension equal to or less than the inner diameter dimension of the valve body.

6. The slide type switching valve according to claim 4 or 5, characterized in that the stepped portion is a portion where the thickness is thinner than the plate portion having the flat portion in the flange portion.

7. The slide type switching valve according to any one of claims 4 to 6, characterized in that chamfering is formed on the inner peripheral side of the open end of the valve body.

8. A compressor that compresses a refrigerant which is a fluid, a first heat exchanger that functions as a condenser in the cooling mode, a second heat exchanger that functions as an evaporator in the cooling mode, expansion means that expands and decompresses the refrigerant between the first heat exchanger and the second heat exchanger, and a slide type switching valve according to any one of claims 1 to 7, characterized in that a refrigeration cycle system is provided with the same.

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