Slide-type switching valve and refrigeration cycle system provided with same

Abstract

The invention provides a sliding type switching valve capable of suppressing valve leakage and a refrigeration cycle system provided with the sliding type switching valve. In the valve seat member (3), a recess (36) is formed in a connecting surface (33) that connects the valve seat surface (31) and a joining curved surface (32) joined to the inner peripheral surface (21A) of the valve body (2), and solder can be stored in the recess (36). The connecting surface (33) is separated from the inner peripheral surface (21A) of the valve main body (2) across a boundary portion (35) with the joint curved surface (32) and a boundary portion (34) with the valve seat surface (31), so that a capillary phenomenon that the brazing filler metal passes through a gap between the valve seat member (3) and the valve main body (2) on the side closer to the valve seat surface (31) than the recess (36) is suppressed, and the brazing filler metal is difficult to face towards the valve seat surface (31) side. Therefore, the solder can be easily accumulated in the concave part (36) and prevented from reaching the valve seat surface (31), and the solder is difficult to interfere with the sliding valve (4) and prevents valve leakage.

Description

TECHNICAL FIELD

[0001] The present application relates to a sliding switching valve and a refrigeration cycle system provided with the same. BACKGROUND

[0002] Generally, a sliding switching valve is known in which a valve body that forms a valve chamber and a valve seat member that is housed in the valve chamber and has a valve seat surface are formed separately and joined by brazing. As such a sliding switching valve, a structure in which gaps are formed between the valve body, the valve seat member, and a joint member, respectively, is proposed (for example, refer to Patent Literature 1). In the sliding switching valve described in Patent Literature 1, in the case where molten brazing material overflows, the brazing material can flow into the gaps of the respective members, and in particular, by making the portion of the valve seat member that opposes the inner peripheral surface of the valve body concave, the brazing material can be accumulated in this portion.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Chinese Utility Model Publication No. 219263258 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, in the sliding switching valve described in Patent Literature 1, depending on the conditions of brazing, sometimes the brazing material can flow out to the valve seat surface side before the brazing material is completely accumulated in the concave portion of the valve seat member. If the brazing material adheres to the valve seat surface and solidifies, the sliding valve can interfere with the brazing material, and valve leakage can easily occur. The flow out of the brazing material to the valve seat surface side can occur regardless of the volume of the concave portion, and therefore even if only the size of the concave portion is changed, it is difficult to suppress the flow out.

[0008] An object of the present application is to provide a sliding switching valve in which valve leakage can be suppressed, and a refrigeration cycle system provided with the same.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The sliding switch valve of the present application is characterized in that the valve seat member has an engaging curved surface which engages with the inner peripheral surface of the cylindrical portion of the valve body and a connecting surface between the valve seat surface and the engaging curved surface, and the valve seat surface is installed to the valve body in a manner that it extends along the axial direction of the cylindrical portion, the connecting surface is separated from the inner peripheral surface at the boundary portion with the engaging curved surface and at the boundary portion with the valve seat surface, has a portion which extends along a predetermined plane or curved surface toward the valve seat surface while being continuous with the engaging curved surface, and is formed with a recess.

[0011] According to the present application as described above, the recess is formed in the connecting surface of the valve seat member, so that the solder can be accumulated in the recess. At this time, the connecting surface is separated from the inner peripheral surface of the valve body at the boundary portion with the engaging curved surface and at the boundary portion with the valve seat surface, so that the capillary phenomenon of the solder passing through the gap between the valve seat member and the valve body on the side of the valve seat surface further than the recess is suppressed, and the solder is difficult to go toward the valve seat surface. That is, in the structure in which the valve seat member and the valve body contact on the side of the valve seat surface further than the recess, the phenomenon in which the solder easily passes through the gap toward the valve seat surface due to the capillary phenomenon is difficult to occur in the present application. Therefore, the solder can be easily accumulated in the recess while being suppressed from reaching the valve seat surface, and the valve leakage is difficult to occur due to the interference with the sliding valve.

[0012] At this time, in the sliding switch valve of the present application, it is preferable that the connecting surface extends away from the inner peripheral surface as it goes from the boundary portion with the engaging curved surface toward the boundary portion with the valve seat surface. According to such a structure, the distance from the inner peripheral surface of the valve body can be easily ensured at the boundary portion of the connecting surface and the valve seat surface, so that the solder is difficult to reach the valve seat surface.

[0013] Further, in the sliding switch valve of the present application, it is preferable that the recess has an engaging curved surface side inner surface which extends from one side of the engaging curved surface toward the bottom, and the engaging curved surface side inner surface extends away from the inner peripheral surface as it goes closer to the valve seat surface, or extends in parallel with the valve seat surface. According to such a structure, when the solder is brazed in a manner that the valve seat surface extends along the vertical direction and the axial direction of the cylindrical portion of the valve body extends along the horizontal direction, the engaging curved surface side inner surface extends upward or along the vertical direction as it goes closer to the valve seat surface. At this time, when the solder which flows downward due to the gravity from the engaging curved surface toward the valve seat surface reaches the recess, the gravity acting on the solder can be made relatively large with respect to the surface tension of the solder which tries to go toward the surface of the valve seat surface along the engaging curved surface side inner surface, so that the solder can be suppressed from going toward the valve seat surface through the recess.

[0014] Further, in the slide type switching valve of the present application, it is preferable that the regions of the connection surface on both sides of the recess portion extend along a common plane or curved surface. According to this structure, the shape of the connection surface can be simplified, and the workability can be improved.

[0015] Further, in the slide type switching valve of the present application, it is also possible that the connection surface extends along a plane orthogonal to the valve seat surface, that the connection surface extends along a plane that is on the opposite side to the inner peripheral surface and that is at an acute angle with respect to the valve seat surface on the side of the engagement curved surface from the valve seat surface, or that the connection surface extends along a plane that is on the opposite side to the inner peripheral surface and that is at an obtuse angle with respect to the valve seat surface on the side of the engagement curved surface from the valve seat surface. According to these structures, it is easy to form a recess portion in the connection surface extending along each plane, and in particular, it is easy to form a recess portion that extends in such a manner as to move away from the inner peripheral surface of the valve main body as the inner surface on the side of the engagement curved surface approaches the valve seat surface, or that extends in parallel with the valve seat surface, as described above.

[0016] Further, in the slide type switching valve of the present application, it is also possible that the connection surface extends along a curved surface that is convex toward the inner peripheral surface. According to this structure, it is easy to ensure a distance from the inner peripheral surface of the valve main body at the boundary portion of the connection surface and the valve seat surface, and it is difficult for the solder to reach the valve seat surface.

[0017] Further, in the slide type switching valve of the present application, it is also possible that the connection surface extends along a curved surface that is concave with respect to the inner peripheral surface. According to this structure, it is easy for the solder to follow the connection surface toward the recess portion.

[0018] Further, in the slide type switching valve of the present application, it is also possible that the regions of the connection surface on both sides of the recess portion extend along mutually different planes or curved surfaces. According to this structure, the degree of freedom in setting the directions in which the regions on both sides of the recess portion extend can be improved, and for example, it is easy to ensure a distance from the inner peripheral surface of the valve main body at the boundary portion of the connection surface and the valve seat surface, and it is difficult for the solder to reach the valve seat surface.

[0019] The refrigeration cycle system of the present application is characterized by comprising: a compressor that compresses a refrigerant as a fluid; a first heat exchanger that functions as a condenser in a cooling mode; a second heat exchanger that functions as an evaporator in the cooling mode; an expansion mechanism that expands and depressurizes the refrigerant between the first heat exchanger and the second heat exchanger; and a four-way switching valve, and the above-described slide type switching valve is provided as the four-way switching valve.

[0020] According to the present application as described above, the valve leakage can be suppressed as described above.

[0021] Effects of the Invention

[0022] The sliding switch valve and the refrigeration cycle system according to the present application can suppress valve leakage. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic configuration view of a refrigeration cycle provided with a sliding switch valve according to an embodiment of the present application.

[0024] Figure 2 is a cross-sectional view of the sliding switch valve.

[0025] Figure 3 is an enlarged cross-sectional view of a main part of the sliding switch valve.

[0026] Figure 4 is a cross-sectional view showing a case where the amount of solder is increased in the sliding switch valve.

[0027] Figure 5 is an enlarged cross-sectional view of a main part of a sliding switch valve according to Modification 1 of the present application.

[0028] Figure 6 is an enlarged cross-sectional view of a main part of a sliding switch valve according to Modification 2 of the present application.

[0029] Figure 7 is an enlarged cross-sectional view of a main part of a sliding switch valve according to Modification 3 of the present application.

[0030] Figure 8 is an enlarged cross-sectional view of a main part of a sliding switch valve according to Modification 4 of the present application.

[0031] Figure 9 is an enlarged cross-sectional view of a main part of a sliding switch valve according to Modification 5 of the present application.

[0032] IN THE DRAWINGS:

[0033] 1 - sliding switch valve, 2 - valve main body, 21 - cylindrical portion, 21A - inner peripheral surface, 2R - valve chamber, 3 - valve seat member, 31 - valve seat surface, 32 - engaging curved surface, 33 - connecting surface, 34, 35 - boundary portion, 30, 36, 39 - recess, 361 - first inclined surface (inner surface on the engaging surface side), 391 - first side surface (inner surface on the engaging surface side), 302 - first curved surface (inner surface on the engaging surface side), 4 - sliding valve. DETAILED DESCRIPTION

[0034] An embodiment of the present application will be described with reference to the drawings. The sliding switch valve 1 of the present embodiment is a four-way switch valve provided in a refrigeration cycle 100, for example. The refrigeration cycle 100 is used in an air conditioner such as a room air conditioner, a cabinet air conditioner, a multi-split air conditioner, and the like, and is provided with a compressor 102 that compresses a refrigerant as a fluid, an outdoor heat exchanger 103 as a first heat exchanger that functions as a condenser in a cooling mode, an indoor heat exchanger 104 as a second heat exchanger that functions as an evaporator in the cooling mode, an expansion valve 105 as an expansion mechanism that expands and depressurizes the refrigerant between the outdoor heat exchanger 103 and the indoor heat exchanger 104, the sliding switch valve 1 as a four-way switch valve, and a pilot solenoid valve 106 that controls switching of flow paths of the sliding switch valve 1, and is connected by refrigerant pipes. Here, the expansion mechanism is not limited to the expansion valve 105, and can be a capillary tube.

[0035] In Figure 1 the cooling mode (refrigeration operation) shown by solid arrows, the refrigeration cycle 100 constitutes a refrigeration cycle in which the refrigerant flows in the order of the compressor 102, the sliding switch valve 1, the outdoor heat exchanger 103, the expansion valve 105, the indoor heat exchanger 104, the sliding switch valve 1, and the compressor 102. On the other hand, in the heating mode (heating operation) shown by dashed arrows, the refrigeration cycle 100 constitutes a heating cycle in which the refrigerant flows in the order of the compressor 102, the sliding switch valve 1, the indoor heat exchanger 104, the expansion valve 105, the outdoor heat exchanger 103, the sliding switch valve 1, and the compressor 102. Switching between the heating cycle and the refrigeration cycle is performed by switching operation of the sliding switch valve 1 by the pilot solenoid valve 106.

[0036] As Figure 2 shown, the sliding switch valve 1 of the present embodiment is provided with a valve main body 2 that forms a valve chamber 2R, a valve seat member 3 housed in the valve chamber 2R, a sliding valve 4 that is slidably provided inside the valve main body 2, a high-pressure side conduit (D port) 11 that communicates with a discharge port of the compressor 102, a low-pressure side conduit (S port) 12 that communicates with a suction port of the compressor 102, an indoor side conduit (E port) 13 that communicates with the indoor heat exchanger 104, and an outdoor side conduit (C port) 14 that communicates with the outdoor heat exchanger 103.

[0037] Hereinafter, a sliding direction of the sliding valve 4 is set as an X direction, two directions orthogonal to the X direction and orthogonal to each other are set as Y and Z directions, and up and down in the Z direction are set as a reference. Figure 2

[0038] ​The valve main body 2 is a metal valve housing formed of, for example, stainless steel, and has a valve chamber 2R on the inner side thereof. The valve main body 2 has a cylindrical cylinder portion 21 extending in the X direction (the X direction is set as the axial direction) and plug portions 22, 23 that block both axial end portions thereof, thereby constituting a cylinder body that is entirely sealed, and is formed with spaces sandwiching a piston that moves the slide valve 4 in the X direction. Which of these spaces becomes high pressure is switched by the pilot electromagnetic valve 106, and the slide valve 4 is caused to slide in the X direction by the pressure difference.

[0039] On the cylinder portion 21 (i.e., the side surface portion of the valve main body 2), openings 2A to 2C that are arranged in a straight line in the X direction and are connected to the conduits 12 to 14, respectively, are formed on the lower side in the Z direction (the lower side in the Z direction in Figure 2 Figure 1 On the other side in the Z direction (the upper side in the Z direction in Figure 1

[0040] The valve seat member 3 is constituted separately from the valve main body 2 and is formed of a suitable metal such as stainless steel. The valve seat member 3 is fixed to the valve main body 2 by brazing as described later, and a valve seat surface 31 that is the upper surface thereof is disposed in the valve chamber 2R. Three valve ports 3A to 3C that are opened in the valve seat surface 31 and that communicate with the openings 2A to 2C of the cylinder portion 21, respectively, are formed in the valve seat member 3. The valve seat surface 31 is a planar slide contact surface that extends in the XY plane.

[0041] The slide valve 4 is constituted of, for example, synthetic resin and is formed in a bowl shape (dome shape) that is open toward the valve seat surface 31 side. A communication space 4R that communicates the central valve port 3A and the one-side valve port 3B while not communicating the other-side valve port 3C, or that communicates the central valve port 3A and the other-side valve port 3C while not communicating the one-side valve port 3B, is formed in the interior of the slide valve 4. Further, the illustration of the slide valve 4 is omitted in Figure 2

[0042] Here, the illustration of the slide valve 4 is omitted in Figure 3 The connection structure of the valve main body 2 and the valve seat member 3 in the slide switching valve 1 will be described in detail with reference to Figure 2 Figure 3 The cross section through the valve port 3A is shown, but the cross sections through the valve ports 3B, 3C also have the same shape, and the valve seat member 3 has the same cross-sectional shape regardless of the X direction position. In addition, the valve seat member 3 has a plane of symmetry along the ZX plane, and the two sides in the Y direction are the same shape, and therefore, the shape of only one side in the Y direction will be described below.

[0043] ​​The valve seat member 3 has an engaging curved surface 32 along and in engagement with the inner peripheral surface 21A of the cylindrical portion 21 of the valve body 2, and a connecting surface 33 between the valve seat surface 31 and the engaging curved surface 32, a boundary portion 34 is formed between the valve seat surface 31 and the connecting surface 33, and a boundary portion 35 is formed between the engaging curved surface 32 and the connecting surface 33.

[0044] The inner peripheral surface 21A and the engaging curved surface 32 extend in a circular arc shape as viewed in the X direction (in a cross-sectional view along the YZ plane), and can be in substantially no gap engagement with each other by having substantially equal curvatures, or can have some gap between these surfaces by having a larger curvature of the inner peripheral surface 21A than that of the engaging curved surface 32 or a smaller curvature of the inner peripheral surface 21A than that of the engaging curved surface 32, and the gap is filled with a brazing material. The engaging curved surface 32 does not reach a position at which the valve seat surface 31 is hypothetically extended in the Y direction to cross the inner peripheral surface 21A, thereby forming the connecting surface 33. Further, the valve seat surface 31 is located on the lower side in the Z direction than the center axis of the cylindrical inner peripheral surface 21A. Thus, the inner peripheral surface 21A extends away from the valve port 3A toward the upper side in the Z direction from the opening 2A to the intersection with the hypothetically extended surface of the valve seat surface 31.

[0045] The connecting surface 33 extends along the ZX plane, that is, along a plane orthogonal to the valve seat surface 31 (θ = 90°). Thus, the connecting surface 33 is isolated from the inner peripheral surface 21A across the boundary portion 35 with the engaging curved surface 32 and the boundary portion 34 with the valve seat surface 31. Further, the connecting surface 33 extends away from the inner peripheral surface 21A (the gap in the Y direction becomes larger) toward the boundary portion 34 from the boundary portion 35.

[0046] In the illustrated example, the boundary portion 34 between the valve seat surface 31 and the connecting surface 33 is chamfered. In contrast, the boundary portion 35 between the engaging curved surface 32 and the connecting surface 33 is not chamfered, and the connecting surface 33 has a continuous flat surface 331 continuous with the engaging curved surface 32 without other surfaces such as chamfers. The continuous flat surface 331 is a portion extending along the ZX plane from the engaging curved surface 32 toward the valve seat surface 31.

[0047] The connecting surface 33 is formed with a recess 36 in a V shape in a cross section along the YZ plane. The recess 36 is preferably a groove portion extending in the X direction, and more preferably is formed across the entire length of the valve seat member 3 in the X direction. The recess 36 is composed of a first inclined surface 361 on the engaging curved surface 32 side, a second inclined surface 362 on the valve seat surface 31 side, and a bottom portion 363 which is a boundary between the first inclined surface 361 and the second inclined surface 362.

[0048] The first inclined surface 361 and the second inclined surface 362 each have an inclination of substantially 45° with respect to the XY plane. The first inclined surface 361 is an inner surface of the joint curved surface side that extends from the joint curved surface 32 side toward the bottom 363 so as to extend away from the inner peripheral surface 21A in the Y direction as it approaches the valve seat surface 31 in the Z direction.

[0049] The connecting surface 33 has a second plane 332 in addition to the continuous plane 331 described above. The continuous plane 331 and the second plane 332 are each along the ZX plane and extend along a common plane, with the recess 36 interposed therebetween. In addition, the continuous plane 331 and the second plane 332 each have an inclination of substantially 45° with respect to the first inclined surface 361 and the second inclined surface 362, and are clearly distinguished from the first inclined surface 361 and the second inclined surface 362.

[0050] Next, the details of the method of joining the valve seat member 3 to the valve body 2 by brazing will be described. First, the valve seat member 3 is housed in the valve body 2, and the orientation is set so that the Y direction is along the vertical direction (the orientation in which the up and down direction and the vertical direction in the drawing coincide). Figure 3 A small-diameter portion 37 on the valve seat surface 31 side and a large-diameter portion 38 in which the front end of the low-pressure side conduit 12 is disposed are formed in the valve port 3A. A gap G is formed between the small-diameter portion 37 and the front end surface of the low-pressure side conduit 12 that is inserted to a prescribed depth, and a circular ring-shaped brazing material is disposed in this gap G.

[0051] When such a brazing material is melted, the brazing material tends to go downward due to gravity. Specifically, the brazing material that has passed between the low-pressure side conduit 12 and the large-diameter portion 38 goes between the joint curved surface 32 and the inner peripheral surface 21A toward the bottom in the Z direction.

[0052] The brazing material that has reached the connecting surface 33 is filled between the continuous plane 331 and the inner peripheral surface 21A, and when the amount of brazing material further increases, it is filled along the first inclined surface 361 in the recess 36. At this time, as shown in FIG. 8, the brazing material A is rounded, and has a front end portion Al that follows the inner peripheral surface 21A. Figure 3

[0053] The connecting surface 33 as a whole is separated from the inner peripheral surface 21A, and the recess 36 is formed therein, so the brazing material has difficulty reaching the second plane 332. That is, even if the front end portion Al reaches the intersection position of the extension of the valve seat surface 31 and the inner peripheral surface 21A, the brazing material A does not reach the second plane 332, but rather the brazing material is completely filled in the recess 36, and then reaches the second plane 332, as shown in FIG. 9. Figure 4

[0054] ​​According to the above embodiment, the recess 36 is formed in the connection surface 33 of the valve seat member 3, so that the brazing material can be accumulated in the recess 36. At this time, the connection surface 33 is separated from the inner peripheral surface 21A of the valve main body 2 at the boundary portion 35 with the joint curved surface 32 and at the boundary portion 34 with the valve seat surface 31, so that the capillary phenomenon of the brazing material passing through the gap between the valve seat member 3 and the valve main body 2 on the side of the valve seat surface 31 from the recess 36 is suppressed, and the brazing material is difficult to reach the valve seat surface 31. Therefore, the brazing material can be easily accumulated in the recess 36 while being suppressed from reaching the valve seat surface 31, and it is difficult to interfere with the sliding valve 4, so that the valve leakage is suppressed.

[0055] In addition, the connection surface 33 extends away from the inner peripheral surface 21A of the valve main body 2 as it approaches the boundary portion 34 with the valve seat surface 31 from the boundary portion 35 with the joint curved surface 32, so that the distance from the inner peripheral surface 21A of the valve main body 2 can be easily ensured at the boundary portion 34 of the connection surface 33 with the valve seat surface 31, and the brazing material is difficult to reach the valve seat surface 31.

[0056] In addition, the first inclined surface 361 of the recess 36 extends away from the inner peripheral surface 21A of the valve main body 2 as it approaches the valve seat surface 31, that is, in the arrangement at the time of brazing, extends upward as it approaches the valve seat surface 31, so that when the brazing material flowing to the lower side by gravity from the joint curved surface 32 reaches the recess 36, the gravitational force acting on the brazing material can be made relatively large with respect to the surface tension of the brazing material along the first inclined surface 361 toward the valve seat surface 31, and the brazing material passing through the recess 36 toward the valve seat surface 31 can be suppressed.

[0057] In addition, the continuous plane 331 and the second plane 332 of the connection surface 33, which are arranged on both sides with the recess 36 therebetween, extend along a common plane, so that the shape of the connection surface 33 can be simplified, and the workability can be improved.

[0058] In addition, the connection surface 33 extends along a plane orthogonal to the valve seat surface 31, so that the first inclined surface 361 extending away from the inner peripheral surface 21A of the valve main body 2 as it approaches the valve seat surface 31 can be easily formed in the connection surface 33.

[0059] Furthermore, the present application is not limited to the above-described embodiments, and includes other structures and the like that can achieve the object of the present application, and the modifications and the like shown below are also included in the present application. That is, the shape of the connection surface and the recess formed in the valve seat member can be such as the modifications 1 to 5 shown below. Furthermore, in the description of the modifications 1 to 5 below, the points different from the above-described embodiments are mainly described, and the portions common to the above-described embodiments are omitted from the description. Figures 5 to 9

[0060] Modification 1

[0061] Figure 5 ​represents Modification 1. In Modification 1, the planes along which the continuous plane 331 and the second plane 332 extend are different from those in the above-described embodiment, and the continuous plane 331 and the second plane 332 extend along a plane that forms an acute angle (for example, θ = 70°) with the valve seat surface 31 on the opposite side from the opposite side of the inner peripheral surface 21A and on the lower side (the side of the joining curved surface 32) in the Z direction with respect to the valve seat surface 31. That is, the continuous plane 331 and the second plane 332 are inclined in such a manner that they approach the valve port 3A in the Y direction as they move away from the valve seat surface 31 in the Z direction. Further, the opposite side of the continuous plane 331 and the second plane 332 with respect to the inner peripheral surface 21A refers to the side of the continuous plane 331 and the second plane 332 that is opposite the inner peripheral surface 21A (the lower side in the following modifications as well). Figure 5

[0062] The first inclined surface 361 and the second inclined surface 362 of the recess 36, although having the same inclination with respect to the continuous plane 331 and the second plane 332 as in the above-described embodiment, have different inclinations of the continuous plane 331 and the second plane 332 from those in the above-described embodiment, and thus the inclination angles of the first inclined surface 361 and the second inclined surface 362 with respect to the Z direction are different from those in the above-described embodiment. However, the first inclined surface 361 as the inner surface on the side of the joining curved surface extends in such a manner that it moves away from the inner peripheral surface 21A in the Y direction as it approaches the valve seat surface 31 in the Z direction, as in the above-described embodiment.

[0063] According to such Modification 1, as in the above-described embodiment, it is possible to suppress valve leakage.

[0064] Modification 2

[0065] Figure 6 represents Modification 2. In Modification 2, the planes along which the continuous plane 331 and the second plane 332 extend are different from those in the above-described embodiment, and the continuous plane 331 and the second plane 332 extend along a plane that forms an obtuse angle (for example, θ = 107°) with the valve seat surface 31 on the opposite side from the opposite side of the inner peripheral surface 21A and on the lower side (the side of the joining curved surface 32) in the Z direction with respect to the valve seat surface 31. That is, the continuous plane 331 and the second plane 332 are inclined in such a manner that they move away from the valve port 3A in the Y direction as they move away from the valve seat surface 31 in the Z direction. Further, the continuous plane 311 is relatively short, but is a plane that is distinguished from the first inclined surface 361.

[0066] ​The first inclined surface 361 and the second inclined surface 362 of the recess 36 have the same inclination relative to the continuous plane 331 and the second plane 332 as in the above embodiment, but the inclination of the continuous plane 331 and the second plane 332 is different from that in the above embodiment. Therefore, the inclination angle of the first inclined surface 361 and the second inclined surface 362 relative to the Z direction is different from that in the above embodiment. However, the first inclined surface 361, which is the inner surface of the mating curved surface, extends in the same manner as in the above embodiment, moving closer to the valve seat surface 31 in the Z direction and further away from the inner peripheral surface 21A in the Y direction.

[0067] According to this variation 2, similar to the above embodiment, valve leakage can be suppressed.

[0068] Variation Example 3

[0069] Figure 7 This refers to Modification 3. Modification 3 differs from the above embodiment in that the connecting surface 33 extends along a curved surface. Specifically, in Modification 3, the connecting surface 33 has a continuous curved surface 333 that is continuous with the mating curved surface 32 and a second curved surface 334 on the valve seat surface 31 side. The continuous curved surface 333 and the second curved surface 334 are disposed in regions on both sides separated by the recess 36, and they extend along a common curved surface. This common curved surface is an arc centered inside the cylindrical portion 21 and with a diameter smaller than the diameter of the cylindrical portion 21. In other words, the continuous curved surface 333 and the second curved surface 334 extend along a curved surface that is convex toward the inner peripheral surface 21A.

[0070] Furthermore, in Modified Example 3, the connecting surface 33 also extends across the boundary portion 35 with the mating surface 32 and the boundary portion 34 with the valve seat surface 31, separating from the inner circumferential surface 21A of the valve body 2. Moreover, the connecting surface 33 extends away from the inner circumferential surface 21A as it moves from the boundary portion 35 with the mating surface 32 toward the boundary portion 34 with the valve seat surface 31.

[0071] According to this variation 3, the connecting surface 33 extends along a convex curved surface 21A toward the inner peripheral surface 21A of the valve body 2, thereby making it easy to ensure the distance between the connecting surface 33 and the inner peripheral surface 21A of the valve body 2 at the boundary 34 between the connecting surface 33 and the valve seat surface 31, making it difficult for the brazing filler metal to reach the valve seat surface 31.

[0072] Variation Example 4

[0073] Figure 8This refers to Modification Example 4. Modification Example 4 differs from the above embodiment in that the connecting surface 33 extends along a curved surface and that the recess 39 formed in the connecting surface 33 is rectangular. Specifically, in Modification Example 4, the connecting surface 33 has a continuous curved surface 335 continuous with the mating curved surface 32 and a second curved surface 336 on the valve seat surface 31 side. The continuous curved surface 335 and the second curved surface 336 are disposed in regions separated by the recess 39 on both sides, and they extend along a common curved surface. This common curved surface is an arc centered on the outer side of the cylindrical portion 21 and with a diameter smaller than the diameter of the cylindrical portion 21. In other words, the continuous curved surface 335 and the second curved surface 336 extend along a curved surface that is concave relative to the inner peripheral surface 21A.

[0074] In Modification 4, the recess 39 is composed of three surfaces: a first side surface 391 on the mating surface 32 side, a second side surface 392 on the valve seat surface 31 side, and a bottom surface 393 connecting the first side surface 391 and the second side surface 392. The first side surface 391 and the bottom surface 393 are approximately orthogonal, and the second side surface 392 and the bottom surface 393 are approximately orthogonal. The first side surface 391 and the second side surface 392 are approximately parallel to each other. The first side surface 391, which is the inner surface of the mating surface side, extends away from the inner peripheral surface 21A as it approaches the valve seat surface 31.

[0075] In Modification 4, the connecting surface 33 also extends across the boundary portion 35 with the mating surface 32 and the boundary portion 34 with the valve seat surface 31, separating from the inner circumferential surface 21A of the valve body 2. Furthermore, in Modification 4, the connecting surface 33 extends away from the inner circumferential surface 21A in a portion (particularly the continuous surface 335) as it moves from the boundary portion 35 with the mating surface 32 toward the boundary portion 34 with the valve seat surface 31, but in other portions (particularly the second surface 336), it extends closer to the inner circumferential surface 21A as it moves from the boundary portion 35 with the mating surface 32 toward the boundary portion 34 with the valve seat surface 31.

[0076] According to this variation 4, the connecting surface 33 extends along a concave curved surface relative to the inner peripheral surface 21A of the valve body 2, thereby enabling the brazing filler metal to easily move along the connecting surface toward the concave portion.

[0077] Variation Example 5

[0078] Figure 9Modification 5 is shown. In Modification 5, the difference from the above embodiment is that the continuous plane 331 and the second plane 332, which are disposed on both sides of the connecting surface 33 across the recess 30, extend along different planes, and the recess 30 is arc-shaped. In Modification 5, both the continuous plane 331 and the second plane 332 extend away from the inner peripheral surface 21A from the boundary 35 with the mating surface 32 toward the boundary 34 with the valve seat surface 31, and extend along a plane that forms an acute angle with the valve seat surface 31 on the opposite side to the inner peripheral surface 21A and relative to the valve seat surface 31 in the Z direction (on one side of the mating surface 32). In addition, the acute angle between the second plane 332 and the valve seat surface 31 is larger than the acute angle between the continuous plane 331 and the valve seat surface 31, and the extended surfaces of the continuous plane 331 and the second plane 332 intersect in a manner that protrudes toward the inner peripheral surface 21A.

[0079] The arc-shaped recess 30 has a bottom 301, a first curved surface 302 that is closer to the mating surface 32 than the bottom 301, and a second curved surface 303 that is closer to the valve seat surface 31 than the bottom 301. The first curved surface 302 as a whole and a part of the second curved surface 303, which are the inner surfaces of the mating surface, extend away from the inner peripheral surface 21A as they approach the valve seat surface 31, and other parts of the second curved surface 303 extend closer to the inner peripheral surface 21A as they approach the valve seat surface 31.

[0080] According to this variation 5, the regions on both sides of the recess 30 in the connecting surface 33 extend along different planes, thereby increasing the degree of freedom in setting the direction of extension of the regions on both sides of the recess 30. In this case, compared with the continuous plane 331, the second plane 332 can be set to an angle that increases in the amount of distance from the inner circumferential surface as it approaches the valve seat surface 31. This makes it easy to ensure the distance between the connecting surface 33 and the inner circumferential surface 21A of the valve body 2 at the boundary 34 between the connecting surface 33 and the valve seat surface 31, making it difficult for the brazing filler metal to reach the valve seat surface 31.

[0081] Furthermore, the shapes of the connecting surfaces and grooves in the above embodiments and variations 1 to 5 can be appropriately combined.

[0082] Furthermore, in the above embodiment, the sliding switching valve 1 is a four-way switching valve installed in the refrigeration cycle 100, but the application and structure of the sliding switching valve are not limited to this; for example, it can also be a pilot solenoid valve. In addition, the sliding switching valve is not limited to switching the connection state of two ports by moving the sliding valve; it can also be a structure in which the ports are only open or closed relative to the valve chamber.

[0083] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments, and design changes that do not depart from the spirit of the present invention are also included in the present invention.

Claims

1. A sliding switching valve comprising: a cylindrical valve body forming a valve chamber; a valve seat member having a valve seat surface within the valve chamber; and a sliding valve slidable relative to the valve seat surface, characterized in that, The valve seat component described above has a mating surface that runs along and engages with the inner circumferential surface of the cylindrical portion of the valve body, and a connecting surface between the valve seat surface and the mating surface. It is mounted to the valve body such that the valve seat surface extends along the axial direction of the cylindrical portion. The aforementioned connecting surface extends from the inner circumferential surface to the boundary portion of the aforementioned mating surface and the boundary portion of the aforementioned valve seat surface, and has a portion that extends along a predetermined plane or curved surface toward the aforementioned valve seat surface while being continuous with the aforementioned mating surface, and is formed with a recess.

2. The sliding switching valve according to claim 1, characterized in that, The aforementioned connecting surface extends away from the aforementioned inner circumferential surface from the boundary portion with the aforementioned mating surface toward the boundary portion with the aforementioned valve seat surface.

3. The sliding switching valve according to claim 2, characterized in that, The aforementioned recess has an inner surface of the mating surface extending from one side of the mating surface toward the bottom. The inner surface of the aforementioned mating curved surface extends away from the aforementioned inner circumferential surface as it approaches the aforementioned valve seat surface, or extends parallel to the aforementioned valve seat surface.

4. The sliding switching valve according to claim 2 or 3, characterized in that, The regions on both sides of the aforementioned connecting surface, separated by the aforementioned recess, extend along a common plane or curved surface.

5. The sliding switching valve according to claim 4, characterized in that, The aforementioned connecting surface extends along a plane orthogonal to the aforementioned valve seat surface.

6. The sliding switching valve according to claim 4, characterized in that, The aforementioned connecting surface extends along a plane that forms an acute angle with the aforementioned valve seat surface on the side opposite to the inner circumferential surface and on one side of the aforementioned mating surface relative to the aforementioned valve seat surface.

7. The sliding switching valve according to claim 4, characterized in that, The aforementioned connecting surface extends along a plane that forms an obtuse angle with the aforementioned valve seat surface on the side opposite to the inner circumferential surface and on one side of the aforementioned mating surface relative to the aforementioned valve seat surface.

8. The sliding switching valve according to claim 4, characterized in that, The aforementioned connecting surface extends along a curved surface that is convex toward the aforementioned inner circumferential surface.

9. The sliding switching valve according to claim 4, characterized in that, The aforementioned connecting surface extends along a concave curved surface relative to the aforementioned inner circumferential surface.

10. The sliding switching valve according to claim 2 or 3, characterized in that, The regions on both sides of the aforementioned connecting surface, separated by the aforementioned recess, extend along different planes or curved surfaces.

11. A refrigeration cycle system, characterized in that, have: A compressor that compresses a refrigerant that is a fluid; The first heat exchanger that functions as a condenser in cooling mode; A second heat exchanger that functions as an evaporator in cooling mode; An expansion mechanism that expands the refrigerant and reduces pressure between the first heat exchanger and the second heat exchanger; and Four-way switching valve The sliding switching valve as described in claim 1 is used as the above-mentioned four-way switching valve.

Images