JP5369971B2 - Refrigerant circuit device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant circuit device capable of improving operation efficiency in heat pump operation. <P>SOLUTION: The refrigerant circuit device includes: a main circuit 20 constituted by interconnecting interior heat exchangers 24, a compressor 21, an exterior heat exchanger 22 and an expansion mechanism 23 by refrigerant piping 25; a branch introducing route 30 for branching a refrigerant compressed by the compressor 21 and supplying the refrigerant to the interior heat exchangers 24 arranged in a room to be heated; a heat release route 40 introducing a refrigerant condensed by the interior heat exchangers 24 and supplying the refrigerant to a radiator 42; and a return route 50 introducing a refrigerant of which heat is released by the radiator 42 and returning the refrigerant to the main circuit 20. The main circuit 20 is formed by interconnecting in series the plurality of interior heat exchangers 24 dedicated for cooling and evaporating a supplied refrigerant, so that the refrigerant passed through one interior heat exchanger 24 is made to pass through the other interior heat exchangers 24. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a refrigerant circuit device, and more particularly to a refrigerant circuit device applied to, for example, a vending machine.

  2. Description of the Related Art Conventionally, as a refrigerant circuit device applied to, for example, a vending machine, one having a refrigerant circuit is known. As such a refrigerant circuit, a circuit having a cooling dedicated path and a heating path is known.

  The dedicated cooling circuit is configured by sequentially connecting an evaporator, a compressor, a condenser, and an expansion mechanism through a refrigerant pipe.

  The evaporator is disposed inside the commodity storage of the vending machine. This evaporator cools the internal air (internal atmosphere) of the product storage box by the supplied refrigerant passing through a predetermined flow path and evaporating.

  The compressor is disposed in the machine room inside the vending machine main body and outside the product container. The compressor sucks the refrigerant evaporated by the evaporator and compresses the sucked refrigerant into a high temperature and high pressure state. Are discharged.

  The condenser is disposed in the machine room in the same manner as the compressor, introduces the refrigerant compressed by the compressor through the refrigerant pipe, and heats the ambient air by condensing the introduced refrigerant, that is, into the ambient air. It dissipates heat.

  The expansion mechanism is disposed in the machine room in the same manner as the compressor and the condenser, and decompresses the refrigerant condensed in the condenser and adiabatically expands the refrigerant.

  The heating path is a path having an internal heat exchanger and a radiator. The internal heat exchanger is disposed inside the commodity storage. In more detail, it is arrange | positioned inside the goods storage container which accommodates the goods used as the heating object. In this internal heat exchanger, the inlet side is connected to a branch pipe branched from a refrigerant pipe connecting a compressor and a condenser constituting a cooling exclusive path. Such an in-compartment heat exchanger heats the internal air of the product storage container in which the refrigerant is compressed by introducing the refrigerant compressed by the compressor through the branch pipe and condensing the introduced refrigerant.

  In the radiator, the inlet side is connected to the refrigerant pipe connected to the outlet side of the internal heat exchanger, and the outlet side is connected to the pipe provided in a manner to join the refrigerant pipe connecting the condenser and the expansion mechanism. It is connected. Such a radiator introduces the refrigerant condensed in the internal heat exchanger and causes the introduced refrigerant to exchange heat with ambient air to dissipate heat.

  In such a refrigerant circuit, a cooling electromagnetic valve and a heating electromagnetic valve are provided in the refrigerant piping from the compressor to the condenser and the piping from the compressor to the internal heat exchanger, respectively. While the cooling solenoid valve opens when performing a cooling operation to cool the internal atmosphere of all the commodity containers provided with the evaporator, while allowing the refrigerant compressed by the compressor to flow to the condenser, In the case of other operations, the operation is closed to restrict the refrigerant compressed by the compressor from flowing to the condenser. On the other hand, the heating solenoid valve is opened when performing a heat pump operation that heats the internal atmosphere of any of the product storage units provided with the internal heat exchanger and cools the internal atmosphere of the other product storage units, While the refrigerant compressed by the compressor is allowed to flow to the internal heat exchanger, it is closed in other operations and the refrigerant compressed by the compressor is allowed to flow to the internal heat exchanger. It is something to regulate.

  When the cooling operation is performed, the refrigerant flows only through the cooling dedicated path, and when the heat pump operation is performed, the refrigerant flows through the heating path and a part of the cooling dedicated path (for example, Patent Document 1).

JP 2005-227833 A

  By the way, due to the recent demand for energy saving, the above-described refrigerant circuit device is also required to reduce the power consumption. In the refrigerant circuit device, for example, when performing a heat pump operation, the refrigerant radiated by the radiator is adiabatically expanded and then distributed and supplied to the evaporator disposed in the chamber to be cooled. Evaporated with a vessel. Therefore, the refrigerant that has passed through each evaporator does not sufficiently evaporate, and the suction refrigerant temperature of the compressor becomes low, which may cause the discharge refrigerant temperature of the compressor to be low. When the discharged refrigerant temperature becomes low in this manner, the internal air of the chamber to be heated cannot be sufficiently heated by the internal heat exchanger, and the compressor is driven more than necessary, so that the operation efficiency is sufficiently high. It will not be expensive. In particular, the compressor has a property that the temperature of the discharged refrigerant is difficult to rise at the time of start-up, and an inefficient operation is performed every time the compressor is repeatedly driven and stopped.

  An object of this invention is to provide the refrigerant circuit apparatus which can aim at the improvement of the operation efficiency in heat pump operation in view of the said situation.

In order to achieve the above object, the refrigerant circuit device according to claim 1 of the present invention is arranged in each of the target chambers, and the internal atmosphere of the chamber in which the supplied refrigerant is evaporated to evaporate the supplied refrigerant. An internal heat exchanger that cools the refrigerant, a compressor that sucks and compresses the refrigerant evaporated by the internal heat exchanger, and an external heat exchanger that introduces and condenses the refrigerant compressed by the compressor And an expansion mechanism for adiabatic expansion of the refrigerant passing therethrough, connected by refrigerant piping, and the refrigerant compressed by the compressor is branched and introduced, and the object to be heated in the internal heat exchanger The refrigerant introduced into the chamber disposed in the chamber is supplied, the refrigerant is condensed in the internal heat exchanger and the internal atmosphere of the chamber is heated, and the refrigerant is condensed in the internal heat exchanger The introduced refrigerant is introduced and supplied to the radiator, and the radiator is used to remove the refrigerant from the ambient air. In the refrigerant circuit device, comprising: a heat dissipation path for heat dissipation to dissipate heat; and a return path for introducing the refrigerant dissipated by the heatsink and returning it to the upstream side of the internal heat exchanger of the main circuit, The main circuit is formed by connecting in series a plurality of internal heat exchangers dedicated to cooling that evaporate the supplied refrigerant, and the refrigerant that has passed through one internal heat exchanger replaces the other internal heat exchanger. It is arranged in such a way that it passes between the internal heat exchangers connected in series with each other, branching in the middle of the path from the external heat exchanger to the junction with the return path. A bypass path, a bypass valve disposed at a predetermined location of the bypass path, and allowing or restricting refrigerant to pass through the bypass path by opening and closing the bypass path; The refrigerant passing through the path It is provided with a bypass expansion mechanism for thermal expansion, the bypass valve, characterized in that opening when the branch introduction path, the refrigerant in the heat radiation path and the return path passes.

  The refrigerant circuit device according to claim 2 of the present invention is the distributor according to claim 1, wherein the expansion mechanism distributes the refrigerant condensed in the external heat exchanger to each internal heat exchanger. It is characterized by being arranged on the downstream side.

  According to the refrigerant circuit device of the present invention, a plurality of internal heat exchangers dedicated to cooling that evaporate the supplied refrigerant are connected in series, and the refrigerant that has passed through one internal heat exchanger is the other. Since it passes through the internal heat exchanger, the degree of superheat of the refrigerant can be increased by evaporating the refrigerant evaporated in one internal heat exchanger again in the other internal heat exchanger. . Thus, since the degree of superheat of the refrigerant can be increased, the suction refrigerant temperature of the compressor can be increased, and as a result, the discharge refrigerant temperature of the compressor can be increased and the chamber to be heated can be heated. The internal atmosphere of the chamber can be sufficiently heated by the internal heat exchanger. Therefore, it is possible to improve the operation efficiency in the heat pump operation.

FIG. 1 is a sectional view showing a case where an internal structure of a vending machine to which a refrigerant circuit device according to an embodiment of the present invention is applied is viewed from the front. FIG. 2 shows the internal structure of the vending machine shown in FIG. 1, and is a cross-sectional side view of the right commodity storage. FIG. 3 is a conceptual diagram conceptually showing the refrigerant circuit device according to the embodiment of the present invention. FIG. 4 is a conceptual diagram conceptually showing the refrigerant circuit device according to the embodiment of the present invention. FIG. 5 is a conceptual diagram conceptually showing the refrigerant circuit device according to the embodiment of the present invention. FIG. 6 is a conceptual diagram conceptually showing a modification of the refrigerant circuit device according to the embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a refrigerant circuit device according to the present invention will be described in detail with reference to the accompanying drawings as appropriate.

  FIG. 1 is a sectional view showing a case where an internal structure of a vending machine to which a refrigerant circuit device according to an embodiment of the present invention is applied is viewed from the front. The vending machine illustrated here includes a main body cabinet 1.

  The main body cabinet 1 has a rectangular shape with an open front surface. The main body cabinet 1 is provided with three independent commodity containers 3 partitioned by, for example, two heat insulating partition plates 2 in a side-by-side manner. This product storage 3 is for storing products such as canned beverages and beverages containing plastic bottles while maintaining a desired temperature, and has a heat insulating structure.

  FIG. 2 shows the internal structure of the vending machine shown in FIG. 1 and is a cross-sectional side view of the right product storage case 3. Here, the internal structure of the right product storage 3 (hereinafter also referred to as the right storage 3a) is shown, but the central product storage 3 (hereinafter also referred to as the intermediate storage 3b) and the left product storage 3 are shown. The internal structure (hereinafter also referred to as the left warehouse 3c as appropriate) has substantially the same configuration as the right warehouse 3a. In the present specification, the right side indicates the right side when the vending machine is viewed from the front, and the left side indicates the left side when the vending machine is viewed from the front.

  As shown in FIG. 2, an outer door 4 and an inner door 5 are provided on the front surface of the main body cabinet 1. The outer door 4 is for opening and closing the front opening of the main body cabinet 1, and the inner door 5 is for opening and closing the front surface of the commodity storage 3. The inner door 5 is divided into upper and lower parts, and the upper door 5a opens and closes when a product is replenished.

  The product storage 3 is provided with a product storage rack 6, a carry-out mechanism 7 and a carry-out shooter 8. The commodity storage rack 6 is for storing commodities in a manner arranged in the vertical direction. The carry-out mechanism 7 is provided at the lower part of the product storage rack 6 and is used to carry out the products at the bottom of the product group stored in the product storage rack 6 one by one. The carry-out shooter 8 is for guiding the product carried out from the carry-out mechanism 7 to the product take-out port 4 a provided in the outer door 4.

  FIG. 3 is a conceptual diagram conceptually showing the refrigerant circuit device according to the embodiment of the present invention. The refrigerant circuit device illustrated here includes a refrigerant circuit 10 including a main circuit 20, a branch introduction path 30, a heat radiation path 40, and a return path 50.

  The main circuit 20 is configured by appropriately connecting a compressor 21, an external heat exchanger 22, an expansion mechanism 23, and an internal heat exchanger 24 through a refrigerant pipe 25, and a refrigerant (for example, R134a) is enclosed therein. It is.

  The compressor 21 is disposed in the machine room 9 as shown in FIG. The machine room 9 is a room inside the main body cabinet 1, partitioned from the product storage 3 and below the product storage 3. The compressor 21 sucks the refrigerant through the suction port, compresses the sucked refrigerant to be in a high-temperature and high-pressure state (high-temperature and high-pressure refrigerant), and discharges it from the discharge port.

  As shown in FIG. 2, the external heat exchanger 22 is disposed in the machine room 9 similarly to the compressor 21. This external heat exchanger 22 condenses the refrigerant that passes therethrough. More specifically, the refrigerant compressed by the compressor 21 and discharged from the discharge port and sent out through the refrigerant pipe 25 is condensed by exchanging heat with ambient air.

  The refrigerant pipe 25 connecting the external heat exchanger 22 and the compressor 21 is provided with a high-pressure side three-way valve 261. The high pressure side three-way valve 261 will be described later.

  As shown in FIG. 2, the expansion mechanism 23 is disposed in the machine room 9 similarly to the compressor 21 and the external heat exchanger 22. The expansion mechanism 23 is for adiabatic expansion by reducing the pressure of the passing refrigerant. More specifically, the expansion mechanism 23 includes a first capillary tube 23a, a second capillary tube 23b, and a third capillary tube 23c. The first capillary tube 23a, the second capillary tube 23b, and the third capillary tube 23c are divided into three refrigerant pipes 25 branched by a distributor 27 connected to the refrigerant pipe 25 connected to the external heat exchanger 22. Each is arranged.

  A plurality of (three in the illustrated example) heat exchangers 24 in the cabinet are provided, which are disposed in the lower interior of each commodity storage 3 and on the front side of the rear duct D (see FIG. 2). is there. The internal heat exchanger 24 (hereinafter also referred to as the right internal heat exchanger 24a) disposed in the right warehouse 3a is the internal heat disposed in the intermediate warehouse 3b on the downstream side of the first capillary tube 23a. The exchanger 24 (hereinafter also referred to as the internal heat exchanger 24b) is an internal heat exchanger 24 (hereinafter referred to as the left internal chamber) disposed in the left chamber 3c on the downstream side of the second capillary tube 23b. The heat exchanger 24c is also connected to the refrigerant pipe 25 in a manner located on the downstream side of the third capillary tube 23c.

  In the refrigerant pipe 25, low-pressure side solenoid valves 262, 263, and 264 are provided on the way from the distributor 27 to the first capillary tube 23a, the second capillary tube 23b, and the third capillary tube 23c, respectively. The low pressure side solenoid valves 262, 263, and 264 are openable and closable valve elements, and when an open command is given from a control unit (not shown), the low pressure side solenoid valves 262, 263, and 264 are opened and allowed to pass the refrigerant, while being given a close command. If it is closed, the passage of the refrigerant is restricted.

  Refrigerant piping 25 connected to the outlet side of the right-side heat exchanger 24a and the left-side heat exchanger 24c joins at the first joining point P1 and is connected to the compressor 21 via the accumulator 28. Yes. Here, the accumulator 28 is for storing the liquid-phase refrigerant and allowing the gas-phase refrigerant to pass through when the refrigerant passing therethrough is a gas-liquid mixed refrigerant.

  In the refrigerant pipe 25 connected to the outlet side of the left-side internal heat exchanger 24c, a return electromagnetic valve 265 is disposed on the upstream side of the first junction P1. The return electromagnetic valve 265 is a valve body that can be opened and closed. When the opening command is given from a control unit (not shown), the feedback electromagnetic valve 265 opens and allows the refrigerant to pass therethrough, while when the closing command is given. Is closed to restrict the passage of refrigerant.

  In the main circuit 20, a refrigerant pipe 25 (hereinafter also referred to as a connecting pipe 25a) connected to the outlet side of the internal heat exchanger 24b is a refrigerant extending from the first capillary tube 23a to the right internal heat exchanger 24a. The refrigerant 25 is merged at the second merge point P <b> 2 in the middle of the pipe 25. That is, the main circuit 20 connects two internal heat exchangers 24 dedicated to cooling that evaporate the supplied refrigerant, in series by the connecting pipe 25a (refrigerant pipe 25).

  The branch introduction path 30 is connected to the high-pressure side three-way valve 261, that is, branches in the middle of the path from the compressor 21 to the external heat exchanger 22 via the high-pressure side three-way valve 261, and the left internal heat exchanger 24c. It is the path | route comprised by the branch piping 31 which merges with the refrigerant | coolant piping 25 of the entrance side. The branch introduction path 30 is a path for introducing the refrigerant (high-pressure refrigerant) compressed by the compressor 21. Here, the high-pressure side three-way valve 261 is a valve body that opens and closes when a command is given from a control unit (not shown), and the refrigerant compressed by the compressor 21 passes through the refrigerant pipe 25 to the external heat exchanger 22 or This is sent to either one of the left-side heat exchanger 24c through the branch pipe 31. That is, when the refrigerant compressed by the compressor 21 is supplied through the branch introduction path 30, the left-inside heat exchanger 24 c condenses the refrigerant that passes therethrough and the target product storage 3 (left warehouse 3 c). ) To heat the internal air.

  The heat radiation path 40 is branched in the middle of the refrigerant pipe 25 connected to the outlet side of the left-side internal heat exchanger 24c, and on the inlet side of the radiator 42 disposed in a manner adjacent to the external heat exchanger 22. This is a path constituted by the connected heat radiation pipes 41. This heat radiation path 40 is for supplying the refrigerant condensed in the left-side heat exchanger 24c to the heat radiator 42. In the radiator 42 to which the refrigerant is supplied through the heat radiation path 40, heat exchange is performed between the refrigerant and the ambient air, and the refrigerant radiates heat. That is, the heat radiation path 40 introduces the refrigerant condensed in the internal heat exchanger 24 and supplies it to the heat radiator 42, and the heat radiator 42 exchanges heat with ambient air to dissipate heat. A heat radiation check valve 431 is provided in the middle of the heat radiation pipe 41 constituting the heat radiation path 40.

  The return path 50 is connected to the outlet side of the radiator 42 and constitutes the main circuit 20, that is, the third junction P <b> 3 of the refrigerant pipe 25 between the external heat exchanger 22 and the distributor 27. It is the path | route comprised by the return piping 51 connected to. Here, in the refrigerant pipe 25 between the external heat exchanger 22 and the distributor 27, a high-pressure check valve 266 is provided on the upstream side of the third junction P3.

  The refrigerant circuit device having the above-described configuration cools or heats the product stored in the product storage 3 as follows.

  First, the case where CCC operation (operation which cools the internal air of all the goods storage 3) is performed is explained.

  In this case, the open / close state of the high-pressure side three-way valve 261 is adjusted so that the refrigerant (compressed refrigerant) discharged from the compressor 21 is sent to the refrigerant pipe 25, and the low-pressure side solenoid valves 263 and 264 and the feedback solenoid valve 265 are opened. On the other hand, the low pressure side solenoid valve 262 is closed. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  That is, the refrigerant compressed by the compressor 21 passes through the high-pressure side three-way valve 261 and reaches the external heat exchanger 22 via the refrigerant pipe 25. The refrigerant that has reached the external heat exchanger 22 dissipates heat to the surrounding air (outside air) and condenses while passing through the external heat exchanger 22. The refrigerant condensed in the external heat exchanger 22 is branched by the distributor 27 and is adiabatically expanded by the second capillary tube 23b and the third capillary tube 23c, and the internal heat exchanger 24b and the left internal heat exchanger 24c. Then, each of the internal heat exchangers 24 evaporates and takes heat from the internal air of the commodity storage 3 to cool the internal air. The cooled internal air circulates in the interior by driving each internal blower fan, whereby the products stored in each product storage 3 are cooled to the circulating internal air.

  The refrigerant evaporated in the internal heat exchanger 24b passes through the connecting pipe 25a, reaches the upstream side of the right internal heat exchanger 24a, and evaporates in the right internal heat exchanger 24a. As a result, the internal air of the right warehouse 3a is cooled by the right internal heat exchanger 24a and circulates in the interior by the drive of the right internal air blower fan F1, whereby the products accommodated in the right warehouse 3a are circulated inside. Cooled to air.

  The refrigerant evaporated in the right internal heat exchanger 24a and the left internal heat exchanger 24c merges at the first confluence P1, and then is separated into gas and liquid by the accumulator 28, and the gas phase portion is sucked into the compressor 21. The compressor 21 is compressed and the above-described circulation is repeated.

  Next, the case where the HCC operation (operation for heating the internal air of the left warehouse 3c and cooling the internal air of the middle warehouse 3b and the right warehouse 3a) is described.

  In this case, the open / close state of the high-pressure side three-way valve 261 is adjusted so that the refrigerant (compressed refrigerant) discharged from the compressor 21 is sent to the branch pipe 31, and the low-pressure side solenoid valve 263 is opened, while the low-pressure side solenoid valve 262 is opened. , 264 and the return solenoid valve 265 are closed. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  That is, the refrigerant compressed by the compressor 21 passes through the branch introduction path 30 and reaches the left-inside heat exchanger 24c. The refrigerant that has reached the left-side heat exchanger 24c exchanges heat with the internal air of the left-hand side 3c while passing through the left-side heat exchanger 24c, and dissipates heat to the internal air to condense. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in the left warehouse 3c by driving the internal blower fan, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the left-side heat exchanger 24c passes through the heat radiation pipe 41 constituting the heat radiation path 40, reaches the heat radiator 42, and radiates heat to the ambient air by the heat radiator 42. The refrigerant radiated by the radiator 42 adiabatically expands in the second capillary tube 23 b via the distributor 27.

  The refrigerant which is adiabatically expanded and vaporized by the second capillary tube 23b reaches the internal heat exchanger 24b, evaporates in the internal heat exchanger 24b and takes heat from the internal air of the internal chamber 3b. Cool the air. The cooled internal air is circulated through the inside of the middle store 3b by driving a blower fan (not shown) in the middle store, and thereby the product accommodated in the middle store 3b is cooled.

  The refrigerant evaporated in the internal heat exchanger 24b passes through the connecting pipe 25a, reaches the upstream side of the right internal heat exchanger 24a, and evaporates in the right internal heat exchanger 24a. As a result, the internal air of the right warehouse 3a is cooled by the right internal heat exchanger 24a and circulates in the interior by the drive of the right internal air blower fan F1, whereby the products accommodated in the right warehouse 3a are circulated inside. Cooled to air.

  The refrigerant evaporated in the right-side heat exchanger 24a is gas-liquid separated by the accumulator 28, and the gas phase portion is sucked into the compressor 21 and compressed by the compressor 21 to repeat the above-described circulation. Thus, the refrigerant circuit 10 has a function as a heat pump.

  As described above, according to the refrigerant circuit device of the present embodiment, the main circuit 20 connects the right internal heat exchanger 24a and the internal heat exchanger 24b in series by the connecting pipe 25a. Since the refrigerant that has been configured to pass through the internal heat exchanger 24b passes through the right internal heat exchanger 24a, the refrigerant used for cooling the internal air of the internal 3b is again stored in the right warehouse. It will be used to cool the internal air of 3a, and the degree of superheat of the refrigerant can be increased. Since the superheat degree of the refrigerant can be increased in this way, the suction refrigerant temperature of the compressor 21 can be increased, and as a result, the discharge refrigerant temperature of the compressor 21 can be increased, and the left internal heat The internal air of the left warehouse 3c can be sufficiently heated by the exchanger 24c. Accordingly, it is possible to improve the operation efficiency in the heat pump operation.

  According to the refrigerant circuit device, the expansion mechanism 23 is disposed downstream of the distributor 27 that distributes the refrigerant condensed in the external heat exchanger 22 to the internal heat exchangers 24. The separation distance between the capillary tube constituting the mechanism 23 and each internal heat exchanger 24 can be reduced. Thereby, the quantity of the heat insulating material which covers the outer peripheral area of the refrigerant | coolant piping 25 between the expansion mechanism 23 and each heat exchanger 24 can be reduced, and, thereby, cost reduction can be aimed at.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications can be made.

  FIG. 6 is a conceptual diagram conceptually showing a modification of the refrigerant circuit device according to the embodiment of the present invention. In addition, the same code | symbol is attached | subjected to what has the same structure as the refrigerant circuit apparatus which is embodiment mentioned above, and the description is abbreviate | omitted. In the refrigerant circuit 10 of the refrigerant circuit device exemplified here, the main circuit 20 includes a bypass path 60.

  The bypass path 60 branches from the first branch point P4 of the refrigerant pipe 25 that extends from the external heat exchanger 22 to the high-pressure check valve 266, and is the fourth between the first capillary tube 23a and the second junction P2. The bypass pipe 61 is arranged so as to join the refrigerant pipe 25 at the junction P5.

  A bypass valve 62 and a bypass capillary tube 63 are disposed in the middle of the bypass pipe 61, that is, at a predetermined portion of the bypass path 60.

  The bypass valve 62 is a valve body that can be opened and closed. When an open command is given from a control unit (not shown), the bypass valve 62 opens and allows the refrigerant to pass through the bypass pipe 61 while being given a close command. In this case, the refrigerant is closed to restrict the refrigerant from passing through the bypass pipe 61. The bypass capillary tube 63 is disposed on the downstream side of the bypass valve 62, and decompresses the refrigerant passing therethrough so as to adiabatically expand the refrigerant.

  In such a refrigerant circuit device, when the bypass valve 62 is opened during the heat pump operation, the refrigerant staying in the external heat exchanger 22, that is, the refrigerant in a so-called stagnation state, is passed through the bypass pipe 61 and bypassed. It can be adiabatically expanded by the capillary tube 63 and sent to the upstream side of the right-side heat exchanger 24a dedicated to cooling. Thus, the refrigerant that has reached the upstream side of the right-side heat exchanger 24a evaporates while passing through the right-side heat exchanger 24a. As a result, the internal air of the right warehouse 3a is cooled by the right internal heat exchanger 24a and circulates in the interior by the drive of the right internal air blower fan F1, whereby the products accommodated in the right warehouse 3a are circulated. Cooled to air.

  Therefore, according to such a refrigerant circuit device, even when the refrigerant has fallen into the external heat exchanger 22 during the heat pump operation, the refrigerant that has fallen down through the bypass pipe 61 is opened by opening the bypass valve 62. The refrigerant circuit 10 can be circulated by being sent to the upstream side of the heat exchanger 24a. In particular, the refrigerant passing through the bypass pipe 61 is adiabatically expanded in the bypass capillary tube 63 to evaporate the refrigerated refrigerant in the right-side heat exchanger 24a and use it for cooling the internal air of the right-side warehouse 3a. Can do.

  As described above, the refrigerant circuit device according to the present invention is useful for vending machines.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 20 Main circuit 21 Compressor 22 External heat exchanger 23 Expansion mechanism 23a 1st capillary tube 23b 2nd capillary tube 23c 3rd capillary tube 24 Internal heat exchanger 25 Refrigerant piping 27 Distributor 28 Accumulator 30 Branch introduction Path 31 Branch pipe 40 Heat radiation path 41 Heat radiation pipe 42 Radiator 50 Return path 51 Return pipe 60 Bypass path 61 Bypass pipe 62 Bypass valve 63 Bypass capillary tube

Claims (2)

An internal heat exchanger for evaporating the supplied refrigerant and cooling the internal atmosphere of the room in which the refrigerant is supplied, and a refrigerant evaporated by the internal heat exchanger A compressor that sucks and compresses the refrigerant, an external heat exchanger that introduces and condenses the refrigerant compressed by the compressor, and an expansion mechanism that adiabatically expands the refrigerant that passes through the refrigerant pipe. The main circuit;
The refrigerant compressed by the compressor is branched and introduced, and the introduced refrigerant is supplied to the internal heat exchanger disposed in the chamber to be heated, and the internal heat exchanger supplies the refrigerant. A branch introduction path for condensing and heating the internal atmosphere of the chamber;
Introducing a refrigerant condensed in the internal heat exchanger and supplying the heat to the radiator, and radiating heat by exchanging heat between the refrigerant and ambient air in the radiator;
In a refrigerant circuit device comprising a return path that introduces the refrigerant radiated by the radiator and returns the refrigerant upstream to the internal heat exchanger of the main circuit,
The main circuit is formed by connecting in series a plurality of internal heat exchangers dedicated to cooling that evaporate the supplied refrigerant, and the refrigerant that has passed through one internal heat exchanger is the other internal heat exchanger. so as to pass through,
A bypass path that is branched in the middle of the path from the external heat exchanger to the junction with the return path, and is arranged in a manner to join between the internal heat exchangers connected in series with each other;
A bypass valve disposed at a predetermined location of the bypass path, allowing or restricting refrigerant to pass through the bypass path by opening and closing itself;
A bypass expansion mechanism disposed in the bypass path and adiabatically expanding the refrigerant passing through the bypass path;
With
The bypass circuit is opened when the refrigerant passes through the branch introduction path, the heat dissipation path, and the return path .   The refrigerant circuit device according to claim 1, wherein the expansion mechanism is disposed on a downstream side of a distributor that distributes the refrigerant condensed in the external heat exchanger to each internal heat exchanger.

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