JP2010127573A - Refrigerating cycle and expansion valve used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating cycle capable of reducing labor and cost required for overall building up, installation of each equipment and piping or the like and of reducing the entire occupation space as much as possible and to provide an expansion valve used for the refrigerating cycle. <P>SOLUTION: The refrigerating cycle includes a compressor, a condenser, an evaporator, an internal heat exchanger and the expansion valve 112, and in the internal heat exchanger, heat exchange is performed between a high-temperature refrigerant led from the condenser to the expansion valve 112 and a low-temperature refrigerant led from the evaporator to the suction side of the compressor. A high-temperature refrigerant conduit 11 for introducing the high-temperature refrigerant from the internal heat exchanger to the inside of the expansion valve 112 and a low-temperature refrigerant conduit 12 for introducing the low-temperature refrigerant from the evaporator to the internal heat exchanger are connected to a piping connection flange 50B mounted to the expansion valve 112. Heat exchange passages 70A, 70B for making the high-temperature refrigerant and/or the low-temperature refrigerant flow are provided in the flange 50B, so as to make the flange 50B function as the internal heat exchanger. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a refrigeration cycle used for a car air conditioner and the like, and in particular, includes a compressor, a condenser, an evaporator, an internal heat exchanger, and an expansion valve. The present invention relates to a refrigeration cycle in which heat is exchanged between a high-temperature refrigerant introduced to the refrigerant and a low-temperature refrigerant introduced from an evaporator to a suction side of a compressor, and an expansion valve used therefor.

  In order to improve the cooling capacity and the like in a refrigeration cycle used for a car air conditioner or the like, conventionally, for example, the one shown in FIG. 5 has been proposed or put into practical use. That is, the refrigeration cycle 10 in the illustrated example includes a compressor 101, a condenser 102, an evaporator 103, an internal heat exchanger 104, and an expansion valve 110 (described later), and in the internal heat exchanger 104, from the condenser 102. Heat exchange is performed between the high-temperature and high-pressure refrigerant (liquid phase) guided to the expansion valve 110 and the low-temperature and low-pressure refrigerant (gas phase) guided from the evaporator 103 to the suction side of the compressor 101. (For example, see also Patent Documents 1, 2, and 3 below).

  An example of the expansion valve 110 used in the refrigeration cycle 10 is shown in FIG. The expansion valve 110 of the illustrated example is provided with a valve chamber 24 having an inlet 21 and a valve seat portion 25 (valve port 26) for introducing high-temperature refrigerant from the internal heat exchanger 104 at the lower portion of the valve body 20. In addition, an outlet 22 is provided in the center, temperature-sensitive inlets 31 and outlets 32 are provided on the upper left and right of the valve body 20, and a temperature-sensitive inlet 31 is provided at the top of the valve body 20. A diaphragm device 40 is attached as a temperature-sensitive pressure responsive means that responds to changes in temperature and pressure of the refrigerant flowing to the outlet 32.

  For convenience of piping connection, flanges 50 and 50 (only the right side is shown here) are integrally attached to the left and right sides of the outer periphery of the valve body 20 with bolts 15 or the like. The high-temperature refrigerant conduit 11 for introducing the high-temperature refrigerant from the internal heat exchanger 104 into the expansion valve 110 (in the valve chamber 24) through the through holes 50a and 50b formed in the inlet 21. However, a low-temperature refrigerant conduit 12 for guiding the low-temperature refrigerant from the evaporator 103 to the internal heat exchanger 104 is connected to the outflow port 32, and the vicinity of the ends of the conduits 11 and 12 O-rings 13 and 14 are attached to the outer crossing portions of the conduits 11 and 12 and the flange 50 (typically, the flange 50 is attached to the flange 50 before the flange 50 is attached to the valve body 20). Guidance Keep joined the 11 and 12 brazing). A bolt through hole 55 a is formed at the center of the flange 50, and a bolt female screw 55 b is formed in the valve body 20.

  A ball valve body 30 that opens and closes the valve port 26 and a coil spring 27 that biases the ball valve body 30 in the valve closing direction are arranged in the valve chamber 24.

  The diaphragm device 40 includes a diaphragm 42 for driving the ball valve body 30 in an opening / closing direction (vertical direction) via a drive rod 35 and a connecting body 36, and the diaphragm 42 serves as a partition, An upper pressure chamber 43 and a lower pressure chamber 44 are defined. The upper pressure chamber 43 is sealed with a cap 46 filled with a gas having a predetermined pressure. The lower pressure chamber 44 communicates with the temperature sensing inlet 31 and the outlet 32 through the communication opening 45, and the lower surface side of the diaphragm 42 is connected from the evaporator 103 to the internal heat exchanger 104. The pressure of the introduced low-temperature refrigerant is applied.

  The lower pressure chamber 44, the temperature sensing inlet 31 and the outlet 32, and the refrigerant outlet 22 are closed in the vicinity of the center of the interior of the valve body 20 through which the drive rod 35 is passed. A hole 38 is provided, and an O-ring 39 as a seal material is interposed between the inner peripheral surface of the hole 38 and the outer peripheral surface of the drive rod 35. A spring pressure adjusting nut 28 is screwed into the lower portion of the valve chamber 24, and a seal material is provided between the non-threaded portion of the spring pressure adjusting nut 28 and the inner peripheral surface of the valve chamber 24. An O-ring 29 is interposed.

  Therefore, in the expansion valve 110 having such a configuration, the flow rate (pressure drop and temperature drop) of the refrigerant led out from the outlet 22 to the evaporator 103 is set to a low temperature before heat exchange is performed in the internal heat exchanger 104. The temperature is adjusted according to the temperature and pressure of the refrigerant.

JP 2000-346466 A JP 2007-240041 A JP 2007-303747 A

  By the way, in the refrigeration cycle 10 provided with the compressor 101, the condenser 102, the evaporator 103, the internal heat exchanger 104, and the expansion valve 110 as described above, the internal heat exchanger 104 is incorporated. There is a dislike that the cost required for the entire assembly, installation of each device, piping, etc. becomes high, and there is a problem that the entire occupied space becomes large accordingly, for example, when used as a car air conditioner, etc. There is a strong demand to reduce the labor and cost required for assembly piping and the like and to reduce the total occupied space.

  In order to meet such a demand, Patent Document 3 proposes that an internal heat exchanger is assembled to an expansion valve to form a single assembly.

  However, in the refrigeration cycle described in Patent Document 3, a double tube structure is used as the internal heat exchanger, so that efforts and cost reduction effects, reduction of the total occupied space, etc. are greatly achieved. The fact is that you can't.

  The present invention has been made in view of the above circumstances, and its purpose is to reduce the labor and cost required for the entire assembly, installation of each device, piping, etc. An object of the present invention is to provide a refrigeration cycle that can be reduced as much as possible and an expansion valve used therefor.

  In order to achieve the above object, a refrigeration cycle according to the present invention basically includes a compressor, a condenser, an evaporator, an internal heat exchanger, and an expansion valve, and the internal heat exchanger includes: Piping attached to the expansion valve for heat exchange between the high-temperature refrigerant led from the condenser to the expansion valve and the low-temperature refrigerant led from the evaporator to the suction side of the compressor The connecting flange is configured to function as the internal heat exchanger.

  In a preferred embodiment, a high-temperature refrigerant conduit for introducing the high-temperature refrigerant from the internal heat exchanger into the expansion valve, and the low-temperature refrigerant from the evaporator to the internal heat exchanger are connected to the pipe connection flange. A low-temperature refrigerant conduit for guiding is connected, and a heat exchange passage for flowing the high-temperature refrigerant and / or the low-temperature refrigerant is provided in the flange.

  The flange for pipe connection preferably has a laminated structure in which a plurality of plate-like members are stacked, and the heat exchange passage is provided between the plurality of plate-like members.

  On the other hand, an expansion valve for a refrigeration cycle according to the present invention includes a compressor, a condenser, an evaporator, an internal heat exchanger, and an expansion valve, and the internal heat exchanger is changed from the condenser to the expansion valve. Used in a refrigeration cycle in which heat is exchanged between a high-temperature refrigerant introduced and a low-temperature refrigerant introduced from the evaporator to the suction side of the compressor, and a pipe connection flange is integrally attached. The pipe connecting flange functions as the internal heat exchanger.

  A heat exchange passage for flowing the high-temperature refrigerant and / or low-temperature refrigerant is provided in the pipe connection flange.

  In this case, the pipe connection flange preferably has a laminated structure in which a plurality of plate-like members are overlapped, and the heat exchange passage is provided between the plurality of plate-like members.

  In the refrigeration cycle according to the present invention, a heat exchange passage for flowing a high-temperature refrigerant and / or a low-temperature refrigerant is provided in a pipe connection flange normally provided in an expansion valve, and the flange serves as an internal heat exchanger. Compared to the case where an internal heat exchanger is arranged at a position away from the expansion valve as in the conventional example, the labor and cost required for the entire assembly, installation of each device, piping, etc. Can be reduced, and the entire occupied space can be greatly reduced. Moreover, since the flange for pipe connection that is normally provided in the expansion valve is used as an internal heat exchanger, it can be manufactured at a lower cost compared to the case of using an internal heat exchanger with a double pipe structure, Piping and assembly work can be performed easily, and space is also advantageous.

  Hereinafter, an embodiment of an expansion valve for a refrigeration cycle of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of an expansion valve for a refrigeration cycle according to the present invention. The expansion valve 111 of this embodiment is used in the refrigeration cycle 10 as shown in FIG. Further, the expansion valve 111 of this embodiment is such that the flange portion for pipe connection functions as the internal heat exchanger 104, and the basic components of the expansion valve are substantially the same as the expansion valve 110 shown in FIG. Yes, with respect to the expansion valve 111 of the illustrated first embodiment, portions corresponding to the respective portions of the expansion valve 110 shown in FIG. Will be explained with emphasis.

  The piping connection flange 50A of the expansion valve 111 in the first embodiment shown in the figure is connected to the high-temperature refrigerant conduit 11 (consisting of the first conduit 11a and the second conduit 11b) and the low-temperature refrigerant conduit 12 and is connected to the flange 50A. Heat exchange passages 60A and 60B (described later) for flowing a high-temperature refrigerant from the first conduit 11a are provided in 50A.

  The flange 50A includes a rectangular plate-shaped intermediate plate 53 and a pair of grooved plates 51, 51 of the same shape superimposed on the front side and the back side, as can be understood by referring to FIG. 2 in addition to FIG. The intermediate plate member 53 and the grooved plate members 51 and 51 are fastened and fixed to the valve body 20 with bolts 15 together.

  Specifically, the grooved plate members 51 and 51 are formed with through holes 51a and 51b corresponding to the conduit through holes 50a (high temperature side) and 50b (low temperature side) of the conventional example. Although a through hole 53b corresponding to the through hole 50b of the conventional example is formed in 53, a through hole corresponding to the through hole 50a of the conventional example is not formed (used as a blind cover).

  A pair of generally groove-shaped grooves 61 and 61 that are the heat exchange passages 60A and 60B are formed symmetrically on one side of the grooved plate member 51. One end of the groove 61 opens into the through hole 51a on the high temperature side, and the other end is closed near the through hole 51b on the low temperature side.

  The intermediate plate 53 is formed with through-holes 63 and 63 for communicating the vicinity of the other ends of the left and right grooves 61 and 61 of the grooved plates 51 and 51 superimposed on the front side and the back side. .

  In the flange 50A portion of the expansion valve 111 configured as described above, the high-temperature refrigerant sent from the condenser 102 via the first conduit 11a has a through hole formed in the lower portion of the intermediate plate 53. Since it acts as a blind cover, it flows into the groove 61 from the through-hole 51a of the front-side grooved plate material 51, and passes through the through-hole 63 formed in the intermediate plate material 53 from the groove 61. It flows into the groove 61 and flows into the valve chamber 27 from the groove 61 through the through hole 51 a of the grooved plate 51 on the back side, the second conduit 11 b and the inlet 21 of the valve body 20.

  In this case, the high-temperature refrigerant flows through the heat exchange passages 60A and 60B formed by the grooves 61 and 61, the through holes 63 and 63, and the grooves 61 and 61 provided in the flange 50A, so that the high-temperature refrigerant and the conduit 12 are connected. Heat exchange with the flowing low-temperature refrigerant is performed, the high-temperature refrigerant is cooled, and the temperature of the low-temperature refrigerant is increased.

  As described above, in the refrigeration cycle in which the expansion valve 111 of the present embodiment is used, the heat exchange passages 60A and 60B for allowing the high-temperature refrigerant to flow are provided in the piping connection flange that is normally provided in the expansion valve. Since the flange 50A functions as an internal heat exchanger, as compared with the conventional case where the internal heat exchanger is arranged at a site away from the expansion valve, the entire assembly and each device The labor and cost required for installation, piping, etc. can be reduced, and the entire occupied space can be greatly reduced. Moreover, since the flange for pipe connection that is normally provided in the expansion valve is used as an internal heat exchanger, it can be manufactured at a lower cost compared to the case of using an internal heat exchanger with a double pipe structure, Piping and assembly work can be performed easily, and space is also advantageous.

  FIG. 3 shows a second embodiment of the expansion valve for the refrigeration cycle according to the present invention. As in the first embodiment, the expansion valve 112 of this embodiment is such that the flange portion for pipe connection functions as the internal heat exchanger 104. The basic components of the expansion valve are the expansion components shown in FIG. The expansion valve 111 of the second embodiment shown in the figure is substantially the same as the valve 111, and portions corresponding to the respective portions of the expansion valve 111 of the first embodiment are denoted by the same reference numerals and redundant description is omitted. Will focus on the differences.

  In the pipe connection flange 50B of the expansion valve 112 in the illustrated second embodiment, the high-temperature refrigerant conduit 11 and the low-temperature refrigerant conduit 12 are connected, and heat exchange for flowing the high-temperature refrigerant from the conduit 11 into the flange 50B. Passages 70A and 70B (described later) are provided.

  The flange 50B includes a rectangular plate-shaped intermediate plate 53, a pair of identical grooved plates 51, 51 superimposed on the front side and the back side, and an outer plate 56 superimposed on the front side of the front-side grooved plate 51. The intermediate plate member 53, the grooved plate members 51 and 51, and the outer plate member 56 are fastened to the valve body 20 with bolts 15 together.

  Specifically, the grooved plate members 51, 51, the intermediate plate member 53, and the outer plate member 56 are provided with through holes 51a, 51b53a corresponding to the conduit through holes 50a (high temperature side) and 50b (low temperature side) of the conventional example. 53b, 56a, and 56b are formed (in this embodiment, a through hole 53a is also formed in the intermediate plate 53).

  As shown in FIG. 4, a pair of grooves 71 and 71 that are longer than those of the first embodiment are formed on one surface side of the grooved plate member 51 as shown in FIG. Has been. One end of each of the grooves 71, 71 opens into the high temperature side through hole 51a, and the other end side surrounds each of the left and right halves of the through hole 51b (conduit 12) in order to increase heat exchange efficiency. It is bent in a semicircular shape and extended to the vicinity of the upper end portion of the grooved plate material 51, and the other end portions thereof are closed facing each other.

  The intermediate plate 53 is formed with through holes 73 and 73 for communicating the vicinity of the other ends of the left and right grooves 71 and 71 of the grooved plates 51 and 51 superimposed on the front and back sides thereof. .

  In this embodiment, the leading end of the conduit 11 passes through the outer side plate material 56, the grooved plate material 51, the intermediate plate material 53, and the high-temperature side through holes 56a, 51a, 53a, 51a formed in the grooved plate material 51. A bottomed cylinder member 80 serving as a blind cover is inserted into the distal end portion of the conduit 11 by press-fitting or the like. The conduit 11 is formed with a pair of left and right communication holes 75, 75, 76, 76 so as to continue to the pair of left and right grooves 71, 71 of the front and back grooved plate members 51, 51. The lid cylinder 80 is also formed with communication holes 81 and 81 so as to be continuous with the grooves 71 and 71 and the communication holes 76 and 76 of the grooved plate member 51 on the back side. The conduit 11 has O-rings 16, 17, 18 for sealing between the valve main body 20 (inlet 21), the intermediate plate 53 (through hole 53 a), and the outer plate 56 (through hole 56 a). It is installed.

  In the flange 50B portion of the expansion valve 111 having such a configuration, the high-temperature refrigerant sent from the condenser 102 via the conduit 11 is the lid cylinder 80 (bottom portion) inserted into the conduit 11. Flows into the groove 71 of the front grooved plate material 51 from the communication hole 75 formed in the conduit 11, and from the groove 71 through the through hole 73 formed in the intermediate plate material 53, the rear groove It flows into the groove 71 of the attached plate member 51, and the valve passes through the communication hole 76 formed in the conduit 11 from the groove 71 → the communication hole 81 formed in the cover cylinder 80 → the inside of the cover cylinder 80 → the inlet 21. It flows into the chamber 27.

  In this case, the high-temperature refrigerant flows through the heat exchange passages 70A and 70B including the grooves 71 and 71, the through holes 73 and 73, the grooves 71 and 71, and the like provided in the flange 50B. The heat exchange with the low-temperature refrigerant flowing through is performed, the high-temperature refrigerant is cooled, and the temperature of the low-temperature refrigerant is increased.

  As described above, also in the refrigeration cycle using the expansion valve 112 of the present embodiment, as in the first embodiment, heat exchange for flowing a high-temperature refrigerant into a pipe connection flange normally provided in the expansion valve. Since the passages 70A and 70B are provided and the flange 50B functions as an internal heat exchanger, the internal heat exchanger is disposed at a position away from the expansion valve as in the conventional example. In addition, it is possible to reduce labor and cost required for the entire assembly, installation of each device, piping, and the like, and it is possible to greatly reduce the entire occupied space. Moreover, since the flange for pipe connection that is normally provided in the expansion valve is used as an internal heat exchanger, it can be manufactured at a lower cost compared to the case of using an internal heat exchanger with a double pipe structure, Piping and assembly work can be performed easily, and space is also advantageous.

  In the above-described embodiment, the heat exchange passage is formed by superimposing the intermediate plate 53 and the two grooved plates 51, but it is not always necessary to have such a configuration. Of course, the type and number of plate materials to be stacked, the shape of the grooves, the number of the plate materials, and the like may be changed as appropriate. Further, only the heat exchange passage for flowing the high-temperature refrigerant is formed in the flange, but instead or in addition thereto, a heat exchange passage for flowing the low-temperature refrigerant may be formed in the flange. In addition, when there is a concern about refrigerant leakage between the laminated plate materials (51, 53, 56), a sealing material or the like may be appropriately disposed.

The partial notch longitudinal cross-sectional view which shows 1st Example of the expansion valve for refrigeration cycles which concerns on this invention. The disassembled perspective view of the flange for piping connection with which the expansion valve of 1st Example is equipped. The partial notch longitudinal cross-sectional view which shows 2nd Example of the expansion valve for refrigeration cycles which concerns on this invention. The top view of the board | plate material with a groove | channel used for the flange for piping connection of 2nd Example. The schematic block diagram which shows an example of the conventional freezing cycle. The partial notch longitudinal cross-sectional view which shows an example of the expansion valve currently used with the conventional refrigerating cycle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Refrigeration cycle 101 Compressor 102 Condenser 103 Evaporator 104 Internal heat exchanger 111, 112 Expansion valve 11 High temperature side conduit 12 Low temperature side conduit 20 Valve body 21 Inlet 32 Outlet 24 Valve chamber 30 Ball valve body 40 Diaphragm Device 43 Upper pressure chamber 44 Lower pressure chamber 50A, 50B Expansion valve 51 Grooved plate 53 Intermediate plate 60A, 60B, 70A, 70B Heat exchange passage 61, 71 Groove 63, 73 Through hole 80 Cylindrical material for lid

Claims (6)

A compressor, a condenser, an evaporator, an internal heat exchanger, and an expansion valve, wherein the internal heat exchanger is fed from the condenser to the expansion valve with a high-temperature refrigerant and the evaporator to the compressor. A refrigeration cycle adapted to exchange heat with a low-temperature refrigerant guided to the suction side of
A refrigeration cycle, wherein a flange for pipe connection attached to the expansion valve functions as the internal heat exchanger.   A high-temperature refrigerant conduit for introducing high-temperature refrigerant from the internal heat exchanger into the expansion valve, and a low-temperature for introducing low-temperature refrigerant from the evaporator to the internal heat exchanger, to the pipe connection flange. 2. The refrigeration cycle according to claim 1, wherein the refrigerant conduit is connected, and a heat exchange passage for flowing the high-temperature refrigerant and / or the low-temperature refrigerant is provided in the flange.   The pipe connection flange has a laminated structure in which a plurality of plate-like members are stacked, and the heat exchange passage is provided between the plurality of plate-like members. The refrigeration cycle described. A compressor, a condenser, an evaporator, an internal heat exchanger, and an expansion valve, wherein the internal heat exchanger is fed from the condenser to the expansion valve with a high-temperature refrigerant and the evaporator to the compressor. An expansion valve for a refrigerant cycle that is used in a refrigeration cycle that exchanges heat with a low-temperature refrigerant guided to the suction side of the refrigerant, and that is integrally attached with a flange for pipe connection,
The expansion valve for a refrigeration cycle, wherein the pipe connection flange functions as the internal heat exchanger.   The expansion valve for a refrigeration cycle according to claim 4, wherein a heat exchange passage for flowing the high-temperature refrigerant and / or the low-temperature refrigerant is provided in the flange for pipe connection.   6. The pipe connection flange has a laminated structure in which a plurality of plate-like members are stacked, and the heat exchange passage is provided between the plurality of plate-like members. The expansion valve for a refrigeration cycle described.

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