JP6426644B2 - Sliding type switching valve and refrigeration cycle system - Google Patents

Description

  The present invention relates to a slide type switching valve and a refrigeration cycle system.

  Conventionally, as a refrigeration cycle used in an air conditioner such as a room air conditioner, a refrigerant is circulated to the compressor through a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger during a cooling mode (cooling) operation. To reverse the circulating direction of the refrigerant so that the refrigerant is circulated to the compressor via the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger during the heating mode (heating) operation. It is done. As a flow path switching valve (so-called, four-way valve) for reversing the circulating path of the refrigerant in such a refrigeration cycle, a slide type switching valve provided with a valve body slidably provided inside the valve body is widely used (See, for example, Patent Document 1).

  A conventional slide type switching valve as described in Patent Document 1 will be described based on FIGS. Here, FIG. 13 is a cross-sectional view showing a conventional slide-type switching valve, and (A) is a cross-sectional view along the axial direction, and is a cross-sectional view along arrow E-E in (B); Is a cross-sectional view orthogonal to the axial direction, and is a cross-sectional view taken along line F-F in (A). FIG. 14 is a cross-sectional view showing a part of a conventional slide type switching valve in an enlarged manner. The conventional slide type switching valve 100 has a whole cylindrical valve body 101, a valve body 102 slidably provided inside the valve body 101, and a plurality provided on the peripheral surface of the valve body 101. Ports 101A, 101B, 101C, and 101D, and a plurality of pipe members 103, 104, 105, and 106 communicated with the plurality of ports 101A, 101B, 101C, and 101D and protruding in the radial direction of the valve main body 101; It is configured with.

  The valve main body 101 has a plug 111, 112 for closing both axial ends thereof, and a valve seat 113 fixed to the inside of the valve main body 101, and is configured as a cylinder sealed in a whole. Conduits 111A and 112A connected to pilot valves (not shown) are connected to the plugs 111 and 112, respectively. The valve seat 113 is provided with openings for forming the ports 101B, 101C, and 101D as well as the tips of the pipe members 104, 105, and 106 being inserted therein. The inner surface of the valve seat 113 is a sliding contact surface for slidingly guiding the valve body 102.

  The port 101A is an inflow port 101A through which high pressure refrigerant flows, and is connected to a discharge port of a compressor (not shown) via a pipe member (D joint) 103 which is a high pressure side conduit. The port 101B is an outlet port 101B for returning the refrigerant to the compressor, and is connected to the suction port of the compressor via a pipe member (S joint) 104 which is a low pressure side conduit. The port 101C is an indoor port 101C connected to the indoor heat exchanger via a pipe member (E joint) 105, and the port 101D is connected to an outdoor heat exchanger via a pipe member (C joint) 106. Outdoor port 101D.

  The valve body 102 includes a pair of left and right pistons 121 and 122 in sliding contact with the inner circumferential surface of the valve body 101, and a coupling member 123 which couples the pair of pistons 121 and 122 and extends along the axial direction of the valve body 101 And a valve-like valve member 124 supported by the member 123. The internal space of the valve body 101 includes a high pressure chamber R1 formed between the pair of pistons 121 and 122, a first working chamber R2 formed between one piston body 121 and the plug body 111, and the other piston It is partitioned into a second working chamber R3 formed between 122 and the plug 112. Further, the inside of the bowl-shaped valve member 124 is a communication space R4 which allows the outflow port 101B and the indoor port 101C to communicate with each other, or the outflow port 101B and the outdoor side port 101D to communicate with each other.

  The tube member 103 is inserted into the projecting cylindrical portion 114 formed on the circumferential surface of the valve body 101, and the outer circumferential surface is fixed by brazing. The tube members 104, 105, 106 are respectively inserted into the through holes 115 formed in the circumferential surface of the valve main body 101, as shown also in FIG. It is fixed by brazing to the valve body 101 and the valve seat 113 via a fixing portion 116 along the edge of the through hole 115. In the valve seat 113, three openings 117 constituting ports 101B, 101C, 101D and three for inserting the tip of the pipe members 104, 105, 106 continuously in a step-like shape in each opening 117 And the insertion hole 118 of the

  Such a slide type switching valve 100 slides the valve body 102 to one side (the left side in FIG. 13A) by the pressure of the high pressure refrigerant introduced from the pilot valve (not shown) into the second working chamber R3. The communication space R4 of the valve member 124 causes the outflow port 101B to communicate with the indoor port 101C, and causes the inflow port 101A to communicate with the outdoor side port 101D via the high pressure chamber R1. On the other hand, the valve body 102 is slid to the other side (right side of FIG. 13A) by the pressure of the high pressure refrigerant introduced from the pilot valve into the first working chamber R2, so that the communication space R4 of the valve member 124 flows out. A heating mode is established in which the port 101B communicates with the outdoor side port 101D, and the inflow port 101A communicates with the indoor side port 101C via the high pressure chamber R1.

  The flow of the refrigerant in the heating mode will be described in detail. The high-temperature, high-pressure refrigerant RF1 that has flowed from the compressor into the high pressure chamber R1 through the pipe member (D joint) 103 and the inflow port 101A is, as shown in FIG. It flows to the pipe member (E joint) 105 through the inner port 101 C and is delivered to the indoor heat exchanger through the pipe member 105. The refrigerant exchanges heat with the indoor heat exchanger, and then flows from the pipe member (C joint) 106 into the inside of the valve body 101 through the outdoor port 101D via the expansion valve and the outdoor heat exchanger. Thus, the low-temperature low-pressure refrigerant RF2 which has flowed in from the outdoor side port 101D flows to the outflow port 101B via the communication space R4 of the valve member 124, and is sent to the compressor via the outflow port 101B and the pipe member (S joint) 104. It is refluxed.

Japanese Patent Application Laid-Open No. 7-151251

  However, in the conventional slide type switching valve as described in Patent Document 1, heat loss occurs in the flow path of the refrigerant, and there is a problem that the operation efficiency of the system is lowered.

  Specifically, as shown in FIG. 14, the flow path from the high pressure chamber R1 through which the high temperature / high pressure refrigerant RF1 passes to the pipe member 105 (or the pipe member 106 in the cooling mode) and the low temperature / low pressure refrigerant RF2 The passage from the communication space R4 through which the valve passes to the pipe member 104 is partitioned by the valve member 124, the valve seat 113, or the pipe members 104 and 105 (106) and the valve seat 113. Here, a material (for example, copper) having a high thermal conductivity may be used for the pipe members 104, 105, 106. Also, a material (for example, resin) having a low thermal conductivity is used for the valve member 124, and a material (for example, brass) having a thermal conductivity lower than that of the pipe members 104, 105, 106 for the valve seat 113 Is used.

  In other words, the thermal conductivity of the pipe members 104, 105, 106 is higher than that of the valve member 124. In such a case, the insertion hole is formed from the pipe member 105 (106) on the side through which the high temperature / high pressure refrigerant RF1 passes. Heat can be easily dissipated toward the side pipe member 104 through which the low-temperature low-pressure refrigerant RF2 passes through the valve seat 113 at the position of the portion 118. As a result, the operating efficiency of the refrigeration cycle system is reduced.

  An object of the present invention is to provide a slide type switching valve and a refrigeration cycle system capable of suppressing heat loss and improving the operation efficiency of the system.

The slide type switching valve according to the present invention comprises a cylindrical valve body, a valve body slidably provided inside the valve body, and a plurality of ports provided open on the circumferential surface of the valve body. A slide type switching valve including a plurality of pipe members communicating with each of the plurality of ports and protruding in the radial direction of the valve body, wherein the plurality of pipe members each have a heat than the valve body The valve body is formed of a material having high conductivity, and at least two ports adjacent to each other along the axial direction of the valve body among the plurality of ports are communicated with the two ports. And at least two pipe connectors for connecting the pipe members, wherein one and the other of the two pipe connectors are provided mutually offset in the radial direction of the valve body, Of one and the other tubular member connected to the pipe connection End positions are provided in a staggered manner, and the pipe connection portion is an insertion hole portion for inserting the tip end portion of the pipe member by a predetermined insertion length, and a circumferential surface of the pipe member located outside the insertion hole portion. And one of the insertion holes for inserting the one pipe member and the other insertion hole for inserting the other pipe member, the valve being the valve. It is provided adjacent to each other along the axial direction of the main body, and provided so as to be displaced in the radial direction so as not to overlap each other when seen in the axial direction .

  According to the present invention as described above, one and the other of the pipe connecting portions that respectively connect the pipe members in communication with the adjacent ports along the axial direction of the valve main body are mutually displaced in the radial direction of the valve main body Since the tip end positions of the pipe members connected to these are provided at different levels, it is possible to mutually separate the pipe members formed of a material having a thermal conductivity higher than that of the valve main body. Therefore, a part (pipe connecting portion) of the valve main body made of a material having a relatively low thermal conductivity is positioned between the one and the other pipe members, and the heat transfer resistance between the adjacent pipe members Can be enhanced, and the propagation of heat from the high temperature refrigerant side to the low temperature refrigerant side can be suppressed.

The slide type switching valve according to the present invention comprises a cylindrical valve body, a valve body slidably provided inside the valve body, and a plurality of ports provided open on the circumferential surface of the valve body. A slide type switching valve including a plurality of pipe members communicating with each of the plurality of ports and protruding in the radial direction of the valve body, wherein the plurality of pipe members each have a heat than the valve body The valve body is formed of a material having high conductivity, and at least two ports adjacent to each other along the axial direction of the valve body among the plurality of ports are communicated with the two ports. And at least two pipe connectors for connecting the pipe members, wherein one and the other of the two pipe connectors are provided mutually offset in the radial direction of the valve body, Of one and the other tubular member connected to the pipe connection End position is provided so uneven, the pipe connecting portion, the peripheral surface of the tube and the insertion hole portion for inserting a predetermined insertion length of the tip member, the tube member is located outside of the insertion hole portion formed with a, a fixing portion to be fixed, characterized in that the displacement amount of the tip position of the different levels provided the one and the other of the tubular members is set substantially equal to the insertion length .

According to the present invention, the distal end portion of the pipe member is inserted into the insertion hole portion of the pipe connection portion, and the circumferential surface of the pipe member is fixed to the fixing portion, whereby the pipe member is fixed to the valve body Be done. In the tube member fixed in this manner, the shift amount of the tip position of the one and the other tube member provided in a staggered manner is set to be substantially the same as the insertion length into the insertion hole, thereby making the shaft of the valve body When viewed along the direction, the tips of the one and the other tube members (the insertion portions into the insertion holes) can be separated so that they do not overlap with each other.

  Further, the valve body is integrally formed with a valve seat portion having a sliding contact surface in sliding contact with the valve body, and the at least two ports and a pipe connection portion are formed in the valve seat portion. Is preferred.

  According to this configuration, the valve seat portion is integrally formed with the valve body, and the two adjacent ports and the pipe connection portion are formed in the valve seat portion, whereby the valve body and the valve seat portion are separated. As compared with the case of the structure of (1), it is easy to form the pipe connection portion displaced in the radial direction of the valve main body, and the manufacturing cost of the valve main body can be reduced.

  Furthermore, the valve seat portion is formed on a side opposite to the sliding contact surface and has a flat flat surface recessed from the cylindrical outer peripheral surface of the valve body, and the two pipe connections are formed. Preferably, one of the portions is formed so as to protrude from the flat surface, and the other is formed so as to be recessed from the flat surface.

  According to this configuration, the valve seat portion has a flat flat surface recessed from the cylindrical outer peripheral surface of the valve main body, and one of the pipe connection portions is formed to protrude from the flat surface, and is recessed from the flat surface By forming the other pipe connection portion, one and the other pipe connection portion can be formed with the flat surface as a reference surface, and the brazing property can be enhanced to improve the manufacturing efficiency.

The slide type switching valve according to the present invention comprises a cylindrical valve body, a valve body slidably provided inside the valve body, and a plurality of ports provided open on the circumferential surface of the valve body. A slide type switching valve including a plurality of pipe members communicating with each of the plurality of ports and protruding in the radial direction of the valve body, wherein the plurality of pipe members each have a heat than the valve body The valve body is formed of a material having high conductivity, and at least two ports adjacent to each other along the axial direction of the valve body among the plurality of ports are communicated with the two ports. And at least two pipe connectors for connecting the pipe members, wherein one and the other of the two pipe connectors are provided mutually offset in the radial direction of the valve body, Of one and the other tubular member connected to the pipe connection End position is provided so uneven, the two one of the pipe connecting portion is provided radially outward of said valve body than the other, the radial direction than the tip portion of the tube member at one of the pipe connecting portion said inside, characterized in that the annular member made of a low material thermal conductivity is provided than the tube member.

According to the present invention as described above , the annular member is provided radially inward of the tip end of the pipe member at the one pipe connection portion provided radially outward of the valve main body, and the annular member is larger than the pipe member By being formed of a material having a low thermal conductivity, the heat transfer resistance between the adjacent tube members can be increased to suppress the heat propagation.

  The refrigeration cycle system of the present invention comprises a compressor for compressing a refrigerant that is a fluid, a first heat exchanger that functions as a condenser in the cooling mode, and a second heat exchanger that functions as an evaporator in the cooling mode. An expansion means for expanding and decompressing the refrigerant between the first heat exchanger and the second heat exchanger, and the slide type switching valve according to any one of claims 1 to 5. It is characterized by

  According to the refrigeration cycle system of the present invention, as in the slide type switching valve described above, the tube members formed of a material having a thermal conductivity higher than that of the valve main body can be separated from each other, The heat transfer resistance between the tube members can be increased to suppress the propagation of heat from the high temperature refrigerant side to the low temperature refrigerant side.

  At this time, in the valve body of the slide type switching valve, as the plurality of ports, an inflow port for allowing fluid to flow into the valve body, and a side opposite to the inflow port in the radial direction of the valve body. The first port, the second port, and the third port adjacent to each other along the axial direction of the valve body are provided, and the first port is disposed on the one side of the first port along the axial direction of the valve body. A second port is provided, the third port is provided on the other side of the first port, and a first pipe connection portion for connecting the pipe member in communication with the first port, the second port, and the second port It is preferable that a second pipe connection portion and a third pipe connection portion that respectively connect the pipe members in communication with the third port are provided mutually offset in the radial direction of the valve main body.

  According to this configuration, the first to third pipe connection parts for connecting the pipe members in communication with the first to third ports adjacent to each other are provided, and these three adjacent pipe connection parts are provided. Among them, the first pipe joint located at the center, and the second pipe joint and the third pipe joint located on both sides thereof are provided mutually offset in the radial direction of the valve body. The heat transfer can be suppressed while suppressing the increase in size of the slide type switching valve. That is, as compared with the case where the three pipe connection portions are displaced to different radial positions, the second pipe connection portion and the third pipe connection portion are provided at the same radial position without being displaced. It is only necessary to shift these and the first pipe connection portion from each other, and it is possible to suppress the expansion of the diameter dimension of the valve main body.

  According to the slide type switching valve and the refrigeration cycle system of the present invention, the operation efficiency of the system can be improved by suppressing the heat loss due to the propagation of heat from the high temperature refrigerant side to the low temperature refrigerant side.

It is a schematic block diagram of the refrigerating cycle concerning the embodiment of the present invention. It is an axial sectional view showing the slide type switching valve of the first embodiment used for the refrigeration cycle. It is sectional drawing of the axial orthogonal direction which shows the said slide-type switching valve. It is sectional drawing which expands and shows a part of said slide type | formula switching valve. It is a perspective view which shows the valve main body used for the said slide type switching valve. It is sectional drawing which shows the manufacturing process of the said slide-type switching valve. It is sectional drawing which shows the modification of the said slide-type switching valve. It is sectional drawing which expands and shows a part of slide type switching valve which concerns on the said modification. It is sectional drawing which shows the slide type switching valve of 2nd Embodiment used for the said refrigerating cycle. It is a perspective view which shows the valve main body used for the said slide type switching valve. It is a sectional view showing a slide type switching valve concerning a modification of the present invention. (A), (B) is sectional drawing which shows the slide-type switching valve which concerns on the other modification of this invention. It is sectional drawing which shows the slide-type switching valve based on the prior art example of this invention. It is sectional drawing which expands and shows a part of slide type | formula switching valve of a prior art example. It is sectional drawing which shows the manufacturing process of the slide type | formula switching valve of a prior art example.

  Next, embodiments of the present invention will be described with reference to the drawings. The refrigeration cycle 1 of the present embodiment is used for an air conditioner such as a room air conditioner, and is a compressor 2 that compresses a refrigerant, and an outdoor unit as a first heat exchanger that functions as a condenser during cooling operation. The refrigerant is expanded and decompressed by expanding the heat exchanger 3, the indoor heat exchanger 4 as the second heat exchanger functioning as the evaporator during the cooling operation, and the outdoor heat exchanger 3 and the indoor heat exchanger 4. The expansion valve 5 as expansion means, the four-way switching valve 10 as a slide type switching valve, and the pilot solenoid valve 6 for switching control of the flow path of the four-way switching valve 10 are connected by refrigerant piping There is. The expansion means is not limited to the expansion valve 5 but may be a capillary.

  In the heating mode (heating operation) shown in FIG. 1, the refrigeration cycle 1 includes the compressor 2, the four-way switching valve 10, the indoor heat exchanger 4, the expansion valve 5, the outdoor heat exchanger 3, the four-way switching valve 10 and the compression. The heating cycle in which the refrigerant flows in the order of the machine 2 is configured. On the other hand, in the cooling mode (cooling operation) (not shown), the refrigerant flows in the order of the compressor 2, the four-way switching valve 10, the outdoor heat exchanger 3, the expansion valve 5, the indoor heat exchanger 4, the four-way switching valve 10 and the compressor 2. Configure a cooling cycle. The switching between the heating cycle and the cooling cycle is performed by the switching operation of the four-way switching valve 10 by the pilot solenoid valve 6.

  A four-way switching valve according to a first embodiment of the present invention will be described based on FIGS. As shown in FIG. 2, the four-way switching valve 10 according to the first embodiment includes a cylindrical valve body 11, a valve body 12 slidably provided inside the valve body 11, and a discharge side of the compressor 2. The high pressure side conduit (D joint) 13 connected to the low pressure side conduit (S joint) 14 connected to the suction side of the compressor 2 and the indoor side conduit (E joint) 15 communicating with the indoor heat exchanger 4 And an outdoor side conduit (C joint) 16 communicating with the outdoor heat exchanger 3. The valve body 11 is integrally formed by forging from a metal material such as brass, and the high pressure side conduit 13, the low pressure side conduit 14, the indoor side conduit 15 and the outdoor side conduit 16 which are pipe members have respective thermal conductivity such as copper. It is made of high material.

  The cylindrical valve body 11 has stoppers 17 and 18 that close both end portions in the axial direction (left and right direction in FIG. 2), and is configured as a cylinder sealed in a whole. Conduits 17A and 18A communicated with the pilot solenoid valve 6 are connected to the plugs 17 and 18, respectively. The valve main body 11 is formed by forging a cylindrical portion excluding the plugs 17 and 18 by forging, and the valve main body 11 has a valve seat portion 19 having a sliding contact surface 31 slidingly contacting the valve 12. It is integrally formed. The valve seat portion 19 communicates with the low pressure side conduit 14, the indoor side conduit 15, and the outdoor side conduit 16, and openings 33, 34, which constitute first to third ports 11B, 11C, 11D described later. 35 are provided.

  The valve body 11 is formed with a plurality of ports 11A, 11B, 11C, 11D opened in the circumferential surface thereof. That is, an inflow port 11A is connected to the high pressure side conduit 13 to allow the refrigerant to flow into the valve body 11, and a first valve seat 19 is opened on the opposite side of the inflow port 11A in the radial direction of the valve body 11. A port 11B, a second port 11C, and a third port 11D are provided. The high pressure side conduit 13 is fixed by brazing to the valve body 11 around the inflow port 11A. In the following, the axial direction of the valve main body 11 is simply referred to as the axial direction, and among the radial directions of the valve main body 11 orthogonal to the axial direction, the high pressure side conduit 13, the low pressure side conduit 14, the indoor side conduit 15 and the outdoor side. The direction in which the conduit 16 protrudes (vertical direction in FIG. 2) may be simply referred to as the radial direction.

  The first port 11B is an outlet port 11B to which the low pressure side conduit 14 is connected to cause the refrigerant to flow out from the inside of the valve body 11, and the second port 11C is an indoor port 11C to which the indoor side conduit 15 is connected. The third port 11D is an outdoor port 11D to which the outdoor conduit 16 is connected. The outflow port 11B is provided substantially at the center of the valve main body 11 in the axial direction, and the indoor side port 11C is provided adjacent to one side (left side in FIG. 2) of the outflow port 11B along the axial direction. 11D is provided along the axial direction on the other side (right side in FIG. 2) of the outflow port 11B.

  The valve body 12 includes a pair of left and right pistons 21 and 22 in sliding contact with the inner peripheral surface of the valve main body 11 and a coupling member 23 which couples the pair of pistons 21 and 22 and extends along the axial direction of the valve main body 11 And a valve member 24 supported by the member 23. The internal space of the valve body 11 includes a high pressure chamber R1 formed between the pair of pistons 21 and 22, a first working chamber R2 formed between one piston 21 and the plug 17, and the other piston 22. And a second working chamber R3 formed between the plug 18 and the stopper 18.

  The valve member 24 is an integrally formed member made of synthetic resin, and extends from the opening edge of the collar portion 25 to a flange portion 25 which is concavely opened toward the valve seat portion 19 and a slide of the valve seat portion 19. It has the flange part 26 which carries out the sliding contact with the contact surface 31, and is formed. The collar portion 25 is formed in a dome shape having an oval shape in a plan view, and is inserted into the holding hole of the connecting member 23. Inside the flange portion 25, the outflow port 11B and the indoor side port 11C are communicated with each other so as not to communicate with the outdoor side port 11D, or the outflow port 11B and the outdoor side port 11D are communicated with each other so as to communicate with the indoor side port 11C. A communication space R4 is formed to prevent communication.

  The valve seat portion 19 is located on the inner side of the valve body 11 and is in contact with the sliding surface 31 in sliding contact with the valve member 24 of the valve body 12 and on the opposite side of the sliding surface 31 (outside the valve body 11). A flat surface 32 (see FIG. 5) is formed to project to the inside of the valve main body 11. The flat surface 32 is recessed from the cylindrical outer peripheral surface of the valve main body 11 and is formed in a planar shape parallel to the axial direction. The outflow port 11B, the indoor side port 11C, and the outdoor side port 11D are respectively constituted by openings 33, 34, 35 opened in the sliding contact surface 31 and having a cylindrical inner peripheral surface.

  The low pressure side conduit 14, the indoor side conduit 15, and the outdoor side conduit 16 are respectively communicated with the outflow port 11B, the indoor side port 11C, and the outdoor side port 11D on the flat surface 32 side of the valve seat 19 A pipe connection 36, 37, 38 is provided which connects to 11. The pipe connection portion (first pipe connection portion) 36 is formed so as to protrude outward from the flat surface 32, and the pipe connection portion (second pipe connection portion) 37 and the pipe connection portion (third pipe connection portion) 38 are It is formed by immersing from the flat surface 32. The pipe connection parts 36, 37, 38 respectively have insertion holes 36A, 37A, 38A for inserting the low pressure side conduit 14, the indoor side conduit 15, and the distal end of the outdoor side conduit 16 by a predetermined insertion length L, and Of the low pressure side conduit 14, the indoor side conduit 15, and the fixing portion 36B, 37B, 38B brazed and fixed to the circumferential surface of the outdoor side conduit 16 located outside the insertion holes 36A, 37A, 38A of It is formed.

  The tube connection portion 36 is formed in a cylindrical shape that protrudes radially outward from the flat surface 32 and has an inner diameter larger than the inner diameter of the opening 33 and is formed in a stepped shape continuously with the opening 33 There is. The projection length of the pipe connector 36 from the flat surface 32 is the insertion length L of the tip of the low pressure side conduit 14 with respect to the insertion hole 36A, and from the tip surface 36C of the pipe connector 36 to the stepped portion 36D. It is set the same as the distance of. Accordingly, the low pressure side conduit 14 is fixed with its leading edge 14A positioned substantially flush with the flat surface 32.

  The pipe connection portion 37, 38 has a cylindrical inner peripheral surface which is recessed radially inward from the flat surface 32, has an inner diameter larger than the inner diameter of the openings 34, 35, and is stepped in the openings 34, 35 It is formed continuously. The immersion depth from the flat surface 32 of these pipe connection portions 37, 38 is the insertion length L of the tip of the indoor side conduit 15 and the outdoor side conduit 16 with respect to the insertion holes 37A, 38A, and the flat surface 32. Are set to be the same as the distance from the step portion 37C to the stepped portion 37C. Therefore, the indoor side conduit 15 and the outdoor side conduit 16 are fixed with the tip edges 15A and 16A positioned on the inside of the valve body 11 by the insertion length L from the flat surface 32.

  A fixing structure and a fixing method of the low pressure side conduit 14, the indoor side conduit 15, and the outdoor side conduit 16 with respect to such pipe connection portions 36, 37, 38 will be described based on FIG. The low pressure side conduit 14, the indoor side conduit 15 and the outdoor side conduit 16 are fixed to the pipe connection portions 36, 37, 38 by brazing, and as shown in FIG. The wax B is heated and melted and then solidified, and as shown in FIG. 6 (B), the fixed portions 36B, 37B, 38B are formed by the solidified wax, and low pressure is generated by these fixed portions 36B, 37B, 38B. The side conduits 14, the indoor side conduits 15 and the outdoor side conduits 16 are fixed to the pipe connections 36, 37, 38.

  Specifically, the tip end of the low pressure side conduit 14 is inserted into the insertion hole 36A of the pipe connection portion 36, and the outer circumferential surface of the low pressure side conduit 14 and the tip surface portion 36C of the pipe connection portion 36 are brought into contact Place wax B. Further, the distal end portions of the indoor side conduit 15 and the outdoor side conduit 16 are inserted into the insertion holes 37A, 38A of the pipe connection portions 37, 38, and the outer peripheral surface of the indoor side conduit 15 and the outdoor side conduit 16 and the pipe connecting portion 37, An annular placement solder B is placed in contact with the flat surface 32 around 38. In this state, the valve seat portion 19 of the valve main body 11, the low pressure side conduit 14, the indoor side conduit 15, and the outdoor side conduit 16 are heated by a burner or an electric heater and the like. Let it melt. Thereafter, the heating operation is stopped to wait until the melted wax is cooled and solidified, and when the wax is solidified and the fixing portions 36B, 37B and 38B are formed, the fixing operation is completed.

  Compared with the four-way switching valve 10 of this embodiment, in the conventional slide-type switching valve 100, as shown in FIG. 15, the pipe members 104, 105, 106 have the outer peripheral surface of the valve body 101 and the valve seat 19 It is brazed and fixed to. As the fixing procedure, first, as shown in FIG. 15 (A), the tip of the pipe members 104, 105, 106 is inserted into the through hole 115 of the valve body 101 and the insertion hole 118 of the valve seat 113. An annular placement solder B is installed in contact with the outer peripheral surface of the members 104, 105, 106 and the outer peripheral surface of the valve body 101. In the state where the placing wax B is installed in this manner, the fixing portion 116 is formed by heating the valve main body 101 and the pipe members 104, 105 and 106 to melt the placing wax B and cooling and solidifying the wax. .

  However, in the conventional slide type switching valve 100, as shown in FIG. 15 (B), since the distance between the pipe members 104, 105, 106 is narrow, the melted solder is melted from one of the pipe members 104, 105, 106 As a result, the fixing portion 116 may not be uniformly formed, and a part of the brazing material may be insufficient to cause a fixing failure. In contrast to such a conventional slide type switching valve 100, in the four-way switching valve 10 of this embodiment, as shown in FIG. 6, the low pressure side conduit 14 and the indoor side conduit 15 and the outdoor side conduit 16 are adjacent to each other. Since the pipe connection parts 36, 37, 38 are provided radially offset and the placing braces B are separated from each other, the molten brazes do not come in contact with each other and are not fixed. The portions 36B, 37B, 38B are formed uniformly.

  In the four-way switching valve 10 described above, when the high-pressure refrigerant discharged from the compressor 2 is introduced into the first working chamber R2 via the pilot solenoid valve 6 and the conduit 17A, as shown in FIG. Then, the valve body 12 is slid in the axial direction of the valve body 11 (right side in FIG. 2). In this state, the outflow port 11B and the outdoor side port 11D are communicated with each other by the communication space R4 of the flange 25 of the valve member 24, and the high pressure chamber R1 of the valve main body 11 communicates with the inflow port 11A and the indoor side port 11C. It is communicated. As a result, the four-way switching valve 10 is in the heating mode (heating operation), and the high pressure refrigerant discharged from the compressor 2 and flowing into the high pressure chamber R1 from the inflow port 11A is indoors as shown by solid arrows in FIG. The low-pressure refrigerant that is delivered to the indoor heat exchanger 4 through the port 11C and the indoor side conduit 15 and flows into the communication space R4 from the outdoor heat exchanger 3 through the outdoor side conduit 16 and the outdoor side port 11D is the outflow port 11B. And is returned to the compressor 2 via the low pressure side conduit 14.

  On the other hand, when the high pressure refrigerant is introduced into the second working chamber R3 via the pilot solenoid valve 6 and the conduit 18A, the piston 22 is pressed and the valve body 12 slides in the axial direction of the valve body 11 (left side in FIG. 2) Be done. In this state, the outflow port 11B and the indoor port 11C are communicated with each other by the communication space R4 of the flange 25 of the valve member 24, and the high pressure chamber R1 of the valve main body 11 communicates the inflow port 11A and the outdoor side port 11D. It is communicated. Thereby, the four-way switching valve 10 is in the cooling mode (cooling operation), and as shown by the broken line arrow in FIG. 1, the high pressure refrigerant discharged from the compressor 2 and flowing into the high pressure chamber R1 from the inflow port 11A is the outdoor side port. The low-pressure refrigerant that has been delivered to the outdoor heat exchanger 3 via the indoor heat exchanger 11D via the indoor heat exchanger 11D and flows into the communication space R4 from the indoor heat exchanger 4 via the indoor conduit 15 and the indoor port 11C is the outlet port 11B and the outlet port 11B. It is returned to the compressor 2 via the low pressure side conduit 14.

  As described above, when the refrigerant flow is switched by the four-way switching valve 10, the outlet port 11B and the low pressure side conduit 14 adjacent to each other, the indoor side port 11C and the indoor side conduit 15 (or the outdoor side port 11D and the outdoor side) The conduits 16) have a temperature difference between the refrigerants passing through each other. That is, as shown in FIG. 4, in the heating mode, the high temperature / high pressure refrigerant RF1 passes from the high pressure chamber R1 to the indoor side port 11C and the indoor side conduit 15 and the outflow port 11B and the low pressure side conduit from the communication space R4. The low-temperature low-pressure refrigerant RF2 passes through 14. On the other hand, in the cooling mode, the high temperature and high pressure refrigerant RF1 passes from the high pressure chamber R1 to the outdoor side port 11D and the outdoor side conduit 16 and the low temperature and low pressure refrigerant RF2 from the communication space R4 to the outflow port 11B and the low pressure side conduit 14 Will pass.

  Therefore, heat is transferred from the indoor side port 11C and the indoor side conduit 15 (or the outdoor side port 11D and the outdoor side conduit 16) through which the high temperature and high pressure refrigerant RF1 passes to the outflow port 11B and the low pressure side conduit 14. It will be. At this time, the pipe connection portion 36 and the pipe connection portion 37 (or the pipe connection portion 38) are provided so as to be displaced from each other in the radial direction, and the tip edge 14A of the low pressure side conduit 14 and the indoor side conduit 15 And the distal end edge 16A of the outdoor side conduit 16 are provided in a staggered manner. Therefore, the low pressure side conduit 14 and the indoor side conduit 15 (or the outdoor side conduit 16), which are made of copper having a thermal conductivity higher than that of the brass valve body 11 (the valve seat 19), can be separated from each other. The heat transfer resistance between adjacent ports is increased.

  According to the above-described embodiment, the heat transfer resistance between the adjacent ports, that is, between the outflow port 11B and the indoor port 11C, or between the outflow port 11B and the outdoor port 11D is enhanced. The propagation of heat from the high temperature / high pressure refrigerant RF1 side to the low temperature / low pressure refrigerant RF2 side can be suppressed, and by suppressing the heat loss, the operation efficiency of the system can be improved.

  Also, the inner side conduit 15 and the outdoor side conduit are inserted into the tip end edge 14A of the low pressure side conduit 14 inserted into the insertion hole 36A of the pipe connection 36 and the insertion holes 37A, 38A of the pipe connection 37, 38 The sixteen tip edges 15A and 16A are provided in a step difference with substantially the same dimension as the insertion length L of each other. Thereby, in the low pressure side conduit 14 and the indoor side conduit 15 and the outdoor side conduit 16 adjacent to each other, the insertion portions to the pipe connection portions 36, 37, 38 are separated so as not to overlap each other, and heat transfer resistance is increased. it can.

  Further, the pipe connection portion 36 is formed in a cylindrical shape projecting from the flat surface 32, and a stepped portion 36D to which the tip end edge 14A of the low pressure side conduit 14 abuts is provided in substantially the same plane as the flat surface 32 Therefore, it is possible to suppress the protrusion dimension of the pipe connection portion 36 and to suppress the increase of the thermal mass of the valve seat portion 19. That is, although the distal end portion of the low pressure side conduit 14 and the distal end portions of the indoor side conduit 15 and the outdoor side conduit 16 can be separated from each other as the protrusion dimension of the pipe connection portion 36 is increased, the pipe connection portion 36 If the projection size of the valve is too large, the manufacture of the slide type switching valve becomes difficult. Therefore, the stepped portion 36D is provided in substantially the same plane as the flat surface 32 in order to suppress an increase in heat mass around the outflow port 11B while enhancing the heat transfer resistance between the adjacent ports. Is more preferred.

  The stepped portion 36D of the pipe connection portion 36 is not limited to one provided so as to be located in substantially the same plane as the flat surface 32, but as shown in FIGS. It may be provided at the same radial position as the attached portions 37C, 38C. In this case, the insertion hole 36A is formed extending to the stepped portion 36D, and the annular member 39 is provided radially inward (on the side of the sliding contact surface 31) of the tip of the low pressure side conduit 14 . The annular member 39 has substantially the same diameter as the low pressure side conduit 14 and is formed to have substantially the same length as the insertion length L of the indoor side conduit 15 and the outdoor side conduit 16. The annular member 39 is formed of, for example, the same brass as the valve main body 11 or a material having a lower thermal conductivity than the valve main body 11 as a material having a lower thermal conductivity than copper which is a material of the low pressure side conduit 14 This further enhances the heat transfer resistance between adjacent ports.

  Next, a four-way switching valve according to a second embodiment of the present invention will be described based on FIGS. FIG. 9 is a cross-sectional view showing the four-way switching valve 10A of the present embodiment, in which the valve body 12 and the plug members 17, 18 are omitted from the four-way switching valve 10A. FIG. 10 is a perspective view showing the four-way switching valve 10A, where the valve body 12, the plug members 17, 18 and the conduits 13, 14, 15, 16 are omitted from the four-way switching valve 10A. The four-way switching valve 10A of this embodiment differs from the four-way switching valve 10 of the first embodiment in the configuration of the pipe connection portions 36, 37 and 38 in the valve seat portion 19, and the other configurations are the same or similar. is there. Hereinafter, differences from the first embodiment will be described in detail, and the same or similar components as or to those of the first embodiment may be denoted by the same reference numerals and descriptions thereof may be omitted.

  In the four-way switching valve 10A of the present embodiment, the pipe connection portion 36 has a cylindrical inner peripheral surface which is recessed radially inward from the flat surface 32, and has an inner diameter larger than the inner diameter of the opening 33 It is continuously formed in a stepped shape. The immersion depth from the flat surface 32 of the pipe connection portion 36 is set to be the same as the insertion length L of the tip portion of the low pressure side conduit 14 with respect to the insertion hole portion 36A. Accordingly, the low pressure side conduit 14 is fixed with its leading edge 14A positioned on the inside of the valve body 11 by the insertion length L from the flat surface 32.

  On the other hand, the pipe connection portions 37 and 38 are formed in a cylindrical shape projecting radially outward from the flat surface 32 and have an inner diameter larger than the inner diameter of the openings 34 and 35 and stepped in the openings 34 and 35 It is continuously formed in a shape. The projection length from the flat surface 32 of these pipe connection portions 37 and 38 is set to be the same as the insertion length L of the tip of the indoor side conduit 15 and the outdoor side conduit 16 with respect to the insertion holes 37A and 38A. . Therefore, the indoor side conduit 15 and the outdoor side conduit 16 are fixed with their tip edges 15A and 16A positioned in substantially the same plane as the flat surface 32.

  In the four-way switching valve 10A described above, the pipe connection portion 36 and the pipe connection portions 37, 38 are provided so as to be displaced from each other in the radial direction, and the tip edge 14A of the low pressure side conduit 14 and the indoor side conduit 15 And the tip edges 15A and 16A of the outdoor side conduit 16 are provided in a step difference. Therefore, the low pressure side conduit 14 formed of copper, which has a thermal conductivity higher than that of the brass valve body 11 (the valve seat portion 19), and the indoor side conduit 15 and the outdoor side conduit 16 can be separated from each other. The heat transfer resistance between matching ports is increased. Thus, since the heat transfer resistance between the adjacent ports is enhanced, the propagation of heat from the high temperature / high pressure refrigerant side to the low temperature / low pressure refrigerant side can be suppressed, and the heat loss can be suppressed. Operation efficiency can be improved.

  In addition, this invention is not limited to the said embodiment, The other modification etc. which can achieve the objective of this invention are included, and the modification as shown below is also included in this invention. For example, although the refrigeration cycle 1 used for air conditioners, such as a room air conditioner, was illustrated in the above-mentioned embodiment, the refrigeration cycle of the present invention is not limited to the air conditioners, and the heating mode and the cooling mode can be switched. Any device can be used. Further, the slide type switching valve according to the present invention is not limited to those used for the switching valve in the refrigeration cycle, and can be used for various piping systems for circulating various fluids such as gas and liquid.

  In the embodiment, the valve body 11 is formed of a metal material such as brass, and the pipe member (the high pressure side conduit 13, the low pressure side conduit 14, the indoor side conduit 15 and the outdoor side conduit 16) has a thermal conductivity such as copper. Although the slide type switching valve formed from the high material of the material was illustrated, the material of each part which constitutes the slide type switching valve is not particularly limited, and the pipe member is formed of the material having the heat conductivity relatively higher than the valve main body. It should be done. For example, not only metal materials such as aluminum alloy, stainless steel, iron, titanium, and the like, but also resin materials such as engineering plastics and the like may be used as long as the combination satisfies the above relationship.

  In the above embodiment, the valve main body 11 is integrally formed of a metal material by forging, and the valve seat portion 19 is integrally formed on the valve main body 11. However, the manufacturing method and structure of the valve main body are the same as those in the above embodiment. It is not limited. That is, the valve body may be formed by continuous casting in which molten metal is extruded from a mold and formed, or may be cut out from a metal block by cutting. Furthermore, after the valve body is formed by continuous casting or forging, a valve seat portion, a pipe connection portion, or the like may be formed by cutting. Moreover, in the said embodiment, although pipe | tube connection part 36, 37, 38 was integrally formed by the valve seat part 19 of the valve main body 11, a pipe | tube connection part is joined to the valve seat part separately formed. The valve body may be configured.

  Further, the valve main body is not limited to one in which the valve seat portion is integrally formed, and may be configured as shown in FIG. That is, in the four-way switching valve 10B as a slide type switching valve according to the modification of the present invention shown in FIG. 11, the valve seat portion 19A formed of a resin material or the like separate from the valve main body 11 is fixed inside the valve main body 11. It is done. The valve seat portion 19A is configured to have a sliding contact surface 31A, an outlet port 11B, an indoor port 11C, and openings 33A, 34A, and 35A that constitute an outdoor port 11D. Further, the pipe connection portion 36 is formed to protrude from the outer peripheral surface of the valve main body 11, and the pipe connection portions 37, 38 are embedded on the inner side of the valve main body 11 from the outer peripheral surface of the valve main body 11 to the valve seat portion 19A. It is formed.

  In the four-way switching valve 10B described above, the pipe connection portion 36 and the pipe connection portions 37, 38 are provided so as to be offset from each other in the radial direction, and the tip edge 14A of the low pressure side conduit 14 and the indoor side conduit 15 And the tip edges 15A and 16A of the outdoor side conduit 16 are provided in a step difference. Therefore, the low pressure side conduit 14 made of copper having a thermal conductivity higher than that of the brass valve body 11 and the resin valve seat 19A can be separated from the indoor side conduit 15 and the outdoor side conduit 16 from each other. The heat transfer resistance between adjacent ports is increased. Thus, since the heat transfer resistance between the adjacent ports is enhanced, the propagation of heat from the high temperature / high pressure refrigerant side to the low temperature / low pressure refrigerant side can be suppressed, and the heat loss can be suppressed. Operation efficiency can be improved.

  The slide type switching valve of the present invention includes one in which the valve main body 11 and the valve seat portion 19A as shown in FIG. 11 are separately provided, but they are shown in the first and second embodiments. As described above, the one in which the valve seat portion 19 is integrally formed in the valve main body 11 can improve the operation efficiency of the system as compared with the case of the separate body. That is, when separately fixing the valve body 11 and the valve seat portion 19A separately or when fixing the pipe member (joint) by brazing, the heat conductivity is generally higher than the material of the valve body 11 A brazing material is used. For example, when the material of the valve body is brass or stainless steel, the brazing material is copper braze or silver braze. When the brazing material having such a high thermal conductivity is interposed between the valve body 11 and the valve seat portion 19A, the heat is transmitted from the high temperature side to the low temperature side through the brazing material to cause a heat loss. On the other hand, in the case of the structure of the above embodiment in which the valve seat portion 19 is integrally formed with the valve main body 11, the brazing material does not intervene between the valve main body 11 and the valve seat portion 19; One of the causes of heat loss can be eliminated, and the operating efficiency of the system can be further improved as compared with the separate form.

  Further, in the embodiment, the inflow port 11A is provided on one side in the radial direction of the valve main body 11, and the outflow port 11B, the indoor side port 11C and the outdoor side port 11D are provided on the opposite side (the other side in the radial direction). Although the ports are provided side by side in the axial direction of the valve body, the present invention is not limited to such a structure. That is, in the slide type switching valve according to the present invention, the ports adjacent to each other along the axial direction of the valve body may be at least two ports, and each of the at least two ports may be connected via a pipe connection. The pipe members may be connected, and one and the other of the two pipe connection parts may be provided so as to be displaced from each other in the radial direction of the valve body.

  Further, in the valve main body 11 of the embodiment, the inflow port 11A is provided to face the outflow port 11B among the three ports of the outflow port 11B, the indoor side port 11C and the outdoor side port 11D. Not limited to this, the configuration as shown in FIG. 12 may be employed. That is, in the four-way switching valve 10C as the slide-type switching valve according to the modification of the present invention shown in FIG. 12A, the inflow port 11A is provided to face the indoor side port 11C in the radial direction. Further, in the four-way switching valve 10D as a slide-type switching valve according to the modification of the present invention shown in FIG. 12B, the inflow port 11A is provided to face in the radial direction of the outdoor side port 11D.

  As shown to FIG. 12 (A), when the inflow port 11A was provided facing the indoor side port 11C, it was made to flow in from the inflow port 11A inside valve body 11 in heating mode (heating operation). The fluid can be made to flow linearly toward the indoor port 11C, and the flow path resistance can be reduced. Therefore, during the heating operation, it is possible to suppress the flow rate reduction and the heat loss of the high pressure side fluid, and thereby it is possible to further improve the operation efficiency of the system. The inflow port 11A is not limited to the one provided coaxially with the indoor side port 11C, and one side (left side of FIG. 12A) or the other side (FIG. 12 (FIG. 12) with respect to the indoor side port 11C. It may be provided slightly eccentrically on the right side of A). By making the inflow port 11A eccentric to one side in the axial direction with respect to the indoor side port 11C, even if a part of the flange portion 26 of the valve member 24 overlaps the indoor side port 11C, the contraction of the flow path is alleviated Thus, it is possible to suppress the decrease in the flow rate of the fluid from the inflow port 11A to the indoor port 11C.

  As shown in FIG. 12B, when the inflow port 11A is provided to face the outdoor side port 11D, the fluid that has flowed into the valve main body 11 from the inflow port 11A in the cooling mode (cooling operation) Can be flowed in a straight line toward the outdoor side port 11D, and the flow path resistance can be reduced. Therefore, during the cooling operation, it is possible to suppress the flow rate reduction and the heat loss of the high-pressure side fluid, thereby further improving the operation efficiency of the system. The inflow port 11A is not limited to the one provided coaxially with the outdoor side port 11D, and one side (left side of FIG. 12B) or the other side (FIG. 12 (FIG. 12) with respect to the outdoor side port 11D. It may be provided slightly eccentrically on the right side of B). By making the inflow port 11A eccentric to the other side in the axial direction with respect to the outdoor side port 11D, even if a part of the flange portion 26 of the valve member 24 overlaps the outdoor side port 11D, the contraction of the flow path is alleviated Thus, it is possible to suppress the decrease in the flow rate of the fluid from the inflow port 11A to the outdoor side port 11D.

  Moreover, in the said embodiment, the middle pipe connection part 36 is a pipe of the both sides among the 3 pipe connection parts (pipe connection parts 36, 37, 38) provided mutually adjacent to the axial direction of the valve main body 11 It is formed to protrude in the radial direction more than the connection parts 37, 38 (first embodiment), or the pipe connection parts 37, 38 on both sides are formed to protrude in the radial direction from the middle pipe connection part 36 The second embodiment is not limited to such a configuration. That is, three pipe connection parts may be provided so that radial direction positions may differ in a step shape toward the other side from the axial direction one side of a valve main body.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and changes in design etc. within the scope of the present invention are not limited. Are included in the present invention.

1 refrigeration cycle 2 compressor 3 outdoor heat exchanger (first heat exchanger)
4 Indoor heat exchanger (second heat exchanger)
5 Expansion valve (expansion means)
10, 10A, 10B, 10C, 10D Four-way switching valve (sliding type switching valve)
11 valve body 11A inflow port 11B outflow port (first port)
11C indoor side port (second port)
11D outdoor side port (third port)
12 valve body 13 high pressure side conduit (pipe member)
14 Low pressure side conduit (pipe member)
15 Indoor conduit (pipe member)
16 outdoor side conduit (pipe member)
19, 19A valve seat 31 sliding contact surface 32 flat surface 36 pipe connection portion (first pipe connection portion)
37 pipe connection (second pipe connection)
38 pipe connection (third pipe connection)
36A, 37A, 38A Insertion hole 36B, 37B, 38B Fixing portion 39 Ring member L Insertion length

Claims (7)

A tubular valve body, a valve body slidably provided inside the valve body, a plurality of ports provided open on the peripheral surface of the valve body, and the plurality of ports are communicated. A slide type switching valve including a plurality of pipe members protruding in the radial direction of the valve body,
The plurality of tubular members are each formed of a material having a thermal conductivity higher than that of the valve body,
The valve body includes at least two ports adjacent to each other along the axial direction of the valve body among the plurality of ports, and at least two ports connecting the pipe members in communication with the two ports. A pipe connection part of the
One and the other of the two pipe connection parts are provided offset with respect to each other in the radial direction of the valve body, and the tip positions of one and the other pipe members connected to these pipe connection parts are uneven Provided
The tube connection portion includes an insertion hole portion into which a tip end portion of the tube member is inserted for a predetermined insertion length, and a fixing portion which is located outside the insertion hole portion and fixed to the circumferential surface of the tube member. And one of the insertion holes for inserting the one tube member and the other insertion hole for inserting the other tube member along the axial direction of the valve body. A slide type switching valve , which is provided adjacent to each other and is displaced in the radial direction so as not to overlap each other when seen in the axial direction . A tubular valve body, a valve body slidably provided inside the valve body, a plurality of ports provided open on the peripheral surface of the valve body, and the plurality of ports are communicated. A slide type switching valve including a plurality of pipe members protruding in the radial direction of the valve body,
The plurality of tubular members are each formed of a material having a thermal conductivity higher than that of the valve body,
The valve body includes at least two ports adjacent to each other along the axial direction of the valve body among the plurality of ports, and at least two ports connecting the pipe members in communication with the two ports. A pipe connection part of the
One and the other of the two pipe connection parts are provided offset with respect to each other in the radial direction of the valve body, and the tip positions of one and the other pipe members connected to these pipe connection parts are uneven Provided
The tube connection portion includes an insertion hole portion into which a tip end portion of the tube member is inserted for a predetermined insertion length, and a fixing portion which is located outside the insertion hole portion and fixed to the circumferential surface of the tube member. A slide type switching valve characterized in that the sliding amount switching valve is formed to have a tip end position displacement amount of the one and the other pipe members substantially equal to the insertion length. A tubular valve body, a valve body slidably provided inside the valve body, a plurality of ports provided open on the peripheral surface of the valve body, and the plurality of ports are communicated. A slide type switching valve including a plurality of pipe members protruding in the radial direction of the valve body,
The plurality of tubular members are each formed of a material having a thermal conductivity higher than that of the valve body,
The valve body includes at least two ports adjacent to each other along the axial direction of the valve body among the plurality of ports, and at least two ports connecting the pipe members in communication with the two ports. A pipe connection part of the
One and the other of the two pipe connection parts are provided offset with respect to each other in the radial direction of the valve body, and the tip positions of one and the other pipe members connected to these pipe connection parts are uneven Provided
One of the two pipe connections is provided radially outward of the valve body relative to the other, and radially inward of the tip of the pipe member at the one pipe connection from the pipe member. A slide type switching valve characterized in that an annular member made of a material having low thermal conductivity is provided.   The valve body is integrally formed with a valve seat portion having a sliding contact surface in sliding contact with the valve body, and the at least two ports and a pipe connection portion are formed in the valve seat portion. The slide type switching valve according to any one of claims 1 to 3, characterized in that The valve seat portion is formed on a side opposite to the sliding contact surface and has a flat flat surface recessed from a cylindrical outer peripheral surface of the valve body,
5. The slide type switching valve according to claim 4, wherein one of the two pipe connection parts is formed to protrude from the flat surface, and the other is formed to be recessed from the flat surface.   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, the first heat exchanger, and the first heat exchanger A refrigeration cycle system comprising: expansion means for expanding and decompressing a refrigerant between two heat exchangers; and the slide type switching valve according to any one of claims 1 to 5. . The valve body of the slide type switching valve includes, as the plurality of ports, an inflow port for allowing fluid to flow into the interior of the valve body, and the valve on the radially opposite side of the valve body with respect to the inflow port. First, second and third ports adjacent to each other along the axial direction of the main body are provided;
The second port is provided on one side of the first port along the axial direction of the valve body, and the third port is provided on the other side of the first port,
A first pipe connection portion connecting the pipe members in communication with the first port, and a second pipe connection portion and a third pipe connecting the pipe members in communication with the second port and the third port, respectively 7. The refrigeration cycle system according to claim 6, wherein the connecting portion is provided so as to be displaced from each other in the radial direction of the valve body.

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