JP5663330B2 - Four-way selector valve - Google Patents

Description

  The present invention relates to a four-way switching valve used for equipment using a reversible refrigeration cycle such as refrigeration equipment and air conditioning equipment.

  Conventionally, a four-way switching valve is arranged in the refrigerant passage of the refrigeration cycle to switch the refrigerant passage to switch between indoor cooling and heating. Various types of such four-way switching valves have been proposed in Patent Document 1 and the like.

  As one of the four-way switching valves, for example, a four-way switching valve 41 shown in FIG. 2 includes a sealed hollow cylindrical valve body 43, a connection port 46 communicating with a discharge pipe 45 of a compressor 44, a compressor 44, a connection port 48 communicating with the suction pipe 47 is provided, and two connection ports 53, 54 communicating with the conduits 51, 52 to the heat exchangers 49, 50 are arranged on both sides of the connection port 48. The valve body 42 is slidably provided on the valve seat 56, and the valve body 42 is slid to selectively connect between the central connection port 48 and one of the connection ports 53 and 54 on both sides. To do.

JP 2010-38320 A

  When the four-way switching valve 41 and the like described in Patent Document 1 are used in equipment using a reversible refrigeration cycle such as refrigeration equipment and air conditioning equipment, the four-way switching valve 41 is discharged from the compressor 44 in the state shown in FIG. High-temperature gaseous refrigerant flows through the inside of the conduit 51 through the discharge pipe 45, and low-temperature gaseous refrigerant discharged from the heat exchanger 50 flows through the inside of the conduit 52 and the suction pipe 47.

  Here, the conduit 51, the conduit 52, and the suction pipe 47 are brazed to the valve seat 56. The conduit 51 and the suction pipe 47 are close to each other, and the piping and the valve seat 56 are made of metal. Therefore, the heat conductivity is high, and heat exchange is actively performed between the high-temperature gaseous refrigerant flowing through the conduit 51 and the low-temperature gaseous refrigerant flowing through the suction pipe 47, and as a result, the efficiency of the refrigeration cycle decreases. There was a problem. In this regard, the valve body 42 moves to the right on the valve seat 56, and the high-temperature gaseous refrigerant discharged from the compressor 44 flows through the discharge pipe 45 through the conduit 52, and from the heat exchanger 49. The same applies to the case where the discharged low-temperature gaseous refrigerant flows inside the conduit 51 and the suction pipe 47.

  Therefore, the present invention has been made in view of the problems in the above-described conventional technology, and even when used in equipment using a reversible refrigeration cycle such as refrigeration equipment and air conditioning equipment, the efficiency of the refrigeration cycle is reduced. An object of the present invention is to provide a four-way switching valve that can minimize the above.

In order to achieve the above object, the present invention provides a valve body having a sealed space, a first conduit connected to one side of the valve body and communicating with the sealed space, and connected to the other side of the valve body. A second conduit communicating with the sealed space; third and fourth conduits disposed adjacent to both sides of the second conduit and communicating with the sealed space; and the second conduit in the valve body. A valve seat having an opening communicating with each of the second to fourth conduits, and a valve body slidably disposed on the valve seat, and sliding the valve body in one direction or the other direction A four-way switching valve in which a communication state between the first conduit and the third conduit or between the first conduit and the fourth conduit is selectively switched, wherein the second conduit, the third conduit, and with each of the fourth conduit is formed of a resin or ceramic, a metal flange joints Input to, characterized in that fixed to the valve body.

  According to the present invention, since the second conduit, the third conduit, and the fourth conduit are formed of resin or ceramic having low thermal conductivity, heat is generated between the two even if the high-temperature fluid and the low-temperature fluid flow in the adjacent conduits. Even when this four-way switching valve is used in a reversible refrigeration cycle or the like, it is difficult to replace the refrigeration cycle.

  As described above, according to the present invention, the four-way switching valve that can minimize the decrease in the efficiency of the refrigeration cycle even when used in equipment that uses a reversible refrigeration cycle such as refrigeration equipment and air conditioning equipment. Can be provided.

It is sectional drawing which shows one Embodiment of the four-way selector valve concerning this invention. It is sectional drawing which shows an example of the conventional four-way switching valve.

  Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings. In the following description, a case where a four-way switching valve provided with a valve body according to the present invention is used in an air conditioner will be described as an example.

  FIG. 1 shows an embodiment of a four-way switching valve according to the present invention. This four-way switching valve 1 is provided inside a cylindrical valve body 2 and the valve body 2, and a bowl-shaped valve body 3 is provided. A valve seat 4 that slides, and the valve body 3 slides on the valve seat 4 so that either the discharge pipe 25 of the compressor 34 and the conduit 31 or the conduit 32 to the heat exchangers 38 and 39 are provided. Selectively connect.

  The valve body 2 is formed in a cylindrical shape with stoppers 2 a and 2 b fixed to both ends, and a flange joint 6 to which a discharge pipe 25 is connected is fixed to the upper side of the valve body 2. The flange joints 7 to 9 to which the suction pipe 28 of the compressor 34 and the conduits 31 and 32 to the heat exchangers 38 and 39 are respectively connected are fixed. The flange joints 6 to 9 are made of metal, and the discharge pipe 25 and the like of the compressor 34 are brazed to them.

  Between the metal valve seat 4 fixed to the bottom face in the valve body 2 and each of the flange joints 7 to 9, resin or ceramic conduits 11 to 13 are interposed. These conduits 11 to 13 are made of, for example, PPS, and are press-fitted and fixed to the valve seat 4 and the flange joints 7 to 9.

  Further, inside the valve body 2, a piston 14 is provided between the valve seat 4 and the plug body 2a, a piston 15 is provided between the valve seat 4 and the plug body 2b, and between the pistons 14 and 15, A high pressure chamber 16 is formed. The pistons 14 and 15 are connected to the connecting plate 17 by bolts 20 and 21, respectively, and are configured to be integrally movable by the connecting plate 17.

  The working chamber 18 formed between the piston 14 and the plug 2a and the working chamber 19 formed between the piston 15 and the plug 2b are connected to the four-way switching pilot valve 35 via conduits 23 and 24. It is connected. By interposing the four-way switching pilot valve 35 between the working chambers 18 and 19, when either one of the working chambers 18 or 19 communicates with the inside of the valve body 2 via the conduit 26, the other working chamber. Is configured to communicate with the suction pipe 28 by a conduit 27.

  On the valve seat 4, a bowl-shaped valve body 3 having a communication recess (fluid passage) 3a and an annular flange 3b is provided. The valve body 3 is loosely fitted in the hole 17 a of the connecting plate 17. As a result, the valve body 3 slides on the valve seat 4 as the pistons 14 and 15 move in the left-right direction in FIG. 1, and connects the conduit 12 communicating with the suction pipe 28 connected to the compressor 34. The other conduit is communicated with one of the conduits 11 and 13 on both sides, and the other conduit is opened to the high-pressure chamber 16.

  In order to incorporate the conduits 11 to 13 and the flange joints 7 to 9 into the valve body 2, first, the conduits 31, 28 and 32 are brazed to the flange joints 7 to 9, and then the flange joints 7 to 9 are joined. The conduits 11 to 13 are attached to the valve body, and finally the flange joints 7 to 9 are attached to the valve body 2.

  As shown in FIG. 1, the four-way switching valve 1 having the above-described configuration is used when the refrigerant flow is switched between cooling and heating in an air conditioner. At this time, the high-temperature gaseous refrigerant discharged from the compressor 34 flows through the inside of the conduit 11 through the discharge pipe 25 to reach the heat exchanger 38 from the conduit 31 and is discharged from the heat exchanger 39. The refrigerant flows in the conduit 13 and the conduit 12 through the conduit 32 and reaches the compressor 34 through the suction pipe 28.

  Here, the conduit 11 and the conduit 12 are close to each other. However, since the conduits 11 to 13 are made of resin or ceramic, the thermal conductivity is low, and the high-temperature gaseous refrigerant flowing in the conduit 11 and the conduit 12 are connected. Heat exchange with the flowing low-temperature gaseous refrigerant can be minimized, and a decrease in the efficiency of the refrigeration cycle can be avoided.

  In addition, the valve body 3 moves to the left on the valve seat 4, and the high-temperature gaseous refrigerant discharged from the compressor 34 flows through the inside of the conduit 13 through the discharge pipe 25, and from the conduit 32 to the heat exchanger 39. In the same manner as described above, the low-temperature gaseous refrigerant discharged from the heat exchanger 38 flows through the conduit 11 and the conduit 12 through the conduit 31 and reaches the compressor 34 through the suction pipe 28. In addition, although the conduit 12 and the conduit 13 are close to each other, the conduits 11 to 13 are made of resin or ceramic, so that the thermal conductivity is low, and the high-temperature gaseous refrigerant flowing in the conduit 13 and the low-temperature flowing in the conduit 12 are low. Heat exchange with the gaseous refrigerant can be minimized, and a decrease in the efficiency of the refrigeration cycle can be avoided.

  In the above embodiment, the case where the four-way switching valve 1 according to the present invention is used in an air conditioner has been described as an example. However, in addition to the air conditioner, a device using another reversible refrigeration cycle such as a refrigeration device, Can be used not only for equipment using a refrigeration cycle, but also for equipment that needs to switch the fluid in all directions.

DESCRIPTION OF SYMBOLS 1 Four-way switching valve 2 Valve body 2a, 2b Plug body 3 Valve body 3a Communication recessed part 3b Ridge part 4 Valve seat 6-9 Flange joints 11-13 Pipe | tube 14, 15 Piston 16 High pressure chamber 17 Connecting plate 17a Hole 18, 19 Actuation Chambers 20, 21 Bolts 23, 24 Conduit 25 Discharge pipes 26-28 Conduit 34 Compressor 35 Four-way switching pilot valves 38, 39 Heat exchanger

Claims (1)

A valve body having a sealed space, a first conduit connected to one side of the valve body and communicating with the sealed space, and a second conduit connected to the other side of the valve body and communicating with the sealed space A third and a fourth conduit that are arranged adjacent to each other on both sides of the second conduit and communicate with the sealed space, and an opening that communicates with each of the second to fourth conduits in the valve body. A valve seat having a portion, and a valve body slidably disposed on the valve seat, and by sliding the valve body in one direction or the other direction, the first conduit and the third conduit Or a four-way switching valve in which a communication state between the first conduit and the fourth conduit is selectively switched,
Each of the second conduit, the third conduit, and the fourth conduit is made of resin or ceramic, and press-fitted into a metal flange joint to be fixed to the valve body .

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