JP2016099015A - Refrigerant circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant circuit device for achieving energy saving by reducing power consumption during cooling/heating operation.SOLUTION: The refrigerant circuit device includes a main path 20 having a plurality of interior heat exchangers 24, a compressor 21, an exterior heat exchanger 22, expansion mechanisms 23, and low pressure side solenoid valves 262, 263, 264 arranged on the upstream sides of the expansion mechanisms 23 in an openable/closable manner, respectively, a high pressure refrigerant introduction path 30 for delivering refrigerant from the compressor 21 into the left interior heat exchanger 24c, and a heat release path 40 for returning the refrigerant delivered into the left interior heat exchanger 24c to the main path 20, the middle interior heat exchanger 24b and the right interior heat exchanger 24a being connected in series to each other. It further includes control means 60 for, during cooling/heating operation, closing the low pressure side solenoid valve 264 while opening the low pressure side solenoid valves 262, 263, and setting a high pressure side three-way valve 261 as part of the high pressure refrigerant introduction path 30 into a second delivering state.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a refrigerant circuit device, and more particularly to a refrigerant circuit device that is applied to, for example, a vending machine and includes a refrigerant circuit having a heat pump function.

  2. Description of the Related Art Conventionally, as a refrigerant circuit device that is applied to, for example, a vending machine and includes a refrigerant circuit having a heat pump function, a refrigerant circuit device that includes a main path, a high-pressure refrigerant introduction path, and a heat dissipation path is known.

  The main path is configured by connecting an internal heat exchanger, a compressor, an external heat exchanger, and an expansion mechanism through a refrigerant pipe. The internal heat exchanger is disposed inside a target room. The compressor sucks the refrigerant that has passed through the internal heat exchanger, compresses the sucked refrigerant, and discharges it in a high-temperature and high-pressure state. The external heat exchanger introduces and condenses the refrigerant compressed by the compressor. The expansion mechanism depressurizes the refrigerant condensed in the external heat exchanger and adiabatically expands it.

  In such a main path, the refrigerant compressed by the compressor is condensed by the external heat exchanger, and the condensed refrigerant is adiabatically expanded by the expansion mechanism and evaporated by the internal heat exchanger. The refrigerant evaporated in the internal heat exchanger is sucked by the compressor, compressed again, and circulated. Thereby, the internal air of the chamber in which the internal heat exchanger is disposed is cooled.

  The high-pressure refrigerant introduction path introduces the refrigerant compressed by the compressor, and supplies it to the one disposed in the chamber to be heated among the internal heat exchangers constituting the main path. In this way, the refrigerant is condensed. Thereby, the internal air of the chamber in which the internal heat exchanger is disposed is heated.

  The heat dissipation path is to return the refrigerant to the main path by introducing the refrigerant condensed in the internal heat exchanger and supplying the refrigerant to the external heat exchanger.

  In the refrigerant circuit device having such a configuration, when only cooling the internal air in the corresponding chamber (when performing a single cooling operation), the refrigerant may be circulated so as to pass only through the main path. On the other hand, when the internal air of one chamber is cooled to heat the internal air of the other chamber (when cooling and heating operation is performed), the refrigerant compressed by the compressor passes through the high-pressure refrigerant introduction path and the heat dissipation path. Then, it may be circulated so as to pass through a part of the main route.

  In order to improve the operation efficiency in the cooling and heating operation, the internal heat exchangers arranged in the chamber to be cooled in the cooling and heating operation are connected in series through the refrigerant pipe, A refrigerant circuit device has been proposed in which the refrigerant that has passed through the heat exchanger passes through the other internal heat exchanger (see, for example, Patent Document 1).

JP 2011-33264 A

  By the way, in the refrigerant circuit device proposed in Patent Document 1 described above, the refrigerant that has passed through one of the internal heat exchangers by connecting the internal heat exchangers of the chambers to be cooled in the cooling heating operation in series. Has the following problems because it passes through the other internal heat exchanger. That is, in the chamber in which the other internal heat exchanger on the downstream side of the refrigerant flow is disposed, the internal air of the chamber in which the one internal heat exchanger on the upstream side of the refrigerant flow is cooled to some extent. Therefore, even if the internal air in the chamber in which one of the internal heat exchangers is already below the cooling completion temperature, the other internal heat exchanger is arranged. The driving of the compressor or the like cannot be stopped until the internal air of the installed chamber falls below the cooling completion temperature, and as a result, it is difficult to reduce the power consumption.

  In view of the above circumstances, an object of the present invention is to provide a refrigerant circuit device that can save energy by reducing power consumption when performing a cooling and heating operation.

  In order to achieve the above object, a refrigerant circuit device according to the present invention includes a plurality of internal heat exchangers arranged for each target chamber, a compressor that sucks and compresses the refrigerant, External heat exchangers disposed outside, a plurality of capillary tubes that adiabatically expand the refrigerant that has passed through the external heat exchanger on the upstream side of the internal heat exchanger, and internal heat exchange The main path having an electromagnetic valve arranged to be openable and closable upstream of each capillary tube so as to correspond to the vessel, and the refrigerant compressed by the compressor by opening the introduction valve provided in itself, Among the internal heat exchangers, the high-pressure refrigerant introduction path for sending to the first internal heat exchanger disposed in the chamber to be heated, and the refrigerant sent to the first internal heat exchanger for the main path Heat dissipation path to be supplied to the upstream side of the external heat exchanger in The main path is connected to the outlet side of the second internal heat exchanger of any of the internal heat exchangers to the inlet side of the other third internal heat exchanger In a refrigerant circuit device comprising at least two internal heat exchangers connected in series by merging with a connected refrigerant pipe, the internal air of the chamber in which the first internal heat exchanger is disposed is heated. And when performing the cooling heating operation which cools the internal air of each room | chamber in which the said 2nd internal heat exchanger and the said 3rd internal heat exchanger were arrange | positioned, the said 1st internal heat exchanger And a control means for opening the introduction valve and opening the electromagnetic valve corresponding to the second internal heat exchanger and the third internal heat exchanger. Features.

  Further, in the refrigerant circuit device according to the present invention, the control means closes the introduction valve and performs the third internal heat exchanger when performing the single cooling operation for cooling the internal air of all the chambers. The electromagnetic valve corresponding to is closed, while the electromagnetic valves corresponding to the first internal heat exchanger and the second internal heat exchanger are opened.

  In the refrigerant circuit device, the refrigerant circuit device may be separated from the refrigerant pipe connected to the outlet side of the external heat exchanger and merged with the refrigerant pipe connected to the inlet side of the compressor. The bypass pipe is provided and can be opened and closed in the bypass pipe, and when opened, the refrigerant is allowed to pass through the bypass pipe, whereas when closed, the bypass pipe is connected to the bypass pipe. A bypass valve that restricts passage of the refrigerant; and a heat dissipation expansion mechanism that adiabatically expands the refrigerant that constitutes the heat dissipation path and that has passed through the first internal heat exchanger, and the control means includes: When performing a single heating operation that heats only the internal air of the chamber in which the first internal heat exchanger is disposed, the solenoid valve is closed while the introduction valve and the bypass valve are opened. Features.

  According to the present invention, the control means heats the internal air of the chamber in which the first internal heat exchanger is provided, and the second internal heat exchanger and the third internal heat exchanger are provided. When the cooling and heating operation for cooling the internal air of each chamber is performed, the electromagnetic valve corresponding to the first internal heat exchanger is closed, while the second internal heat exchanger and the third internal heat exchange are performed. Since the solenoid valve corresponding to the chamber is opened and the introduction valve is opened, the third internal heat exchanger includes not only the refrigerant that has passed through the second internal heat exchanger but also the upstream of the first internal heat exchanger. The refrigerant adiabatically expanded by the side capillary tube can be passed. Therefore, the internal air of the chamber in which the third internal heat exchanger is disposed can be cooled simultaneously with the cooling of the internal air in the chamber in which the second internal heat exchanger is disposed. When the internal air of the chamber in which the internal heat exchanger is disposed falls below a predetermined cooling completion temperature, the internal air of the chamber in which the second internal heat exchanger is disposed falls below a predetermined cooling completion temperature It becomes possible to make them close. Thereby, the drive time of a compressor can be shortened and power consumption can be reduced as a result. Therefore, in the case of performing the cooling and heating operation, there is an effect that the power consumption can be reduced and energy saving can be achieved.

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 showing the flow of the refrigerant when performing a single cooling operation (CCC operation) in the refrigerant circuit device shown in FIG. 3. FIG. 5 is a conceptual diagram showing the flow of the refrigerant when performing the cooling heating operation (HCC operation) in the refrigerant circuit device shown in FIG. 3. FIG. 5 is a conceptual diagram showing the flow of the refrigerant when the single heating operation is performed in the refrigerant circuit device shown in FIG. 3.

  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. The commodity storage 3 is a room for storing commodities such as canned beverages and plastic bottled beverages while being maintained at 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 commodity storage 3 is provided with a storage rack 6, a carry-out mechanism 7 and a carry-out shooter 8. The storage rack 6 is used for storing products in a manner of being arranged in the vertical direction. The carry-out mechanism 7 is provided at the lower part of the storage rack 6 and is used to carry out the products at the lowest level of the product group stored in the 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 path 20, a high-pressure refrigerant introduction path 30, a heat radiation path 40, and a bypass path 50, and a control unit 60 that appropriately controls each unit provided in the refrigerant circuit 10. It is prepared.

  The main path 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 is enclosed therein. .

  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. The outside heat exchanger 22 exchanges heat between the refrigerant passing through and the ambient air. An outside air blower fan F2 is provided in the vicinity of the outside heat exchanger 22.

  A high pressure side three-way valve (introduction valve) 261 is provided in the refrigerant pipe 25 connecting the external heat exchanger 22 and the compressor 21. 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 by a distributor 27 connected to a refrigerant pipe 25 connected to the external heat exchanger 22. 25 respectively.

  Here, in the case of performing a cooling heating operation (HCC operation described later) in which the refrigerant flow rate is the maximum, the throttle amounts of the first capillary tube 23a, the second capillary tube 23b, and the third capillary tube 23c constituting the expansion mechanism 23. It has been adjusted to be optimal. As can be seen from FIG. 1, the volume of the storage 3b is the smallest, so that the throttle amount of the second capillary tube 23b is adjusted to the largest.

  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. An internal heat exchanger 24 (hereinafter also referred to as a right internal heat exchanger (third internal heat exchanger) 24a) disposed in the right warehouse 3a is disposed downstream of the first capillary tube 23a. An internal heat exchanger 24 (hereinafter also referred to as an internal internal heat exchanger (second internal heat exchanger) 24b) disposed in 3b is disposed downstream of the second capillary tube 23b in the left internal 3c. The internal heat exchanger 24 (hereinafter, also referred to as a left internal heat exchanger (first internal heat exchanger) 24c) disposed in the interior is a refrigerant that is located downstream of the third capillary tube 23c. The pipe 25 is connected.

  Further, 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, which are opened when the opening command is given from the control means 60 and allow passage of the refrigerant, while when the closing command is given. Is closed to restrict the passage of the refrigerant. In addition, the code | symbol 281 in FIG. 3 is a low pressure side check valve.

  The refrigerant pipe 25 connected to the outlet side of the right-side internal heat exchanger 24a and the left-side internal heat exchanger 24c joins at the first joining point P1 and is connected to the compressor 21.

  A return solenoid valve 265 is disposed upstream of the first junction P1 in the refrigerant line 25 connected to the outlet side of the left-side heat exchanger 24c. The feedback solenoid valve 265 is a valve body that can be opened and closed. When the opening command is given from the control means 60, the feedback solenoid valve 265 opens and allows the refrigerant to pass, but closes when the closing command is given. In this way, the passage of the refrigerant is restricted.

  In the main path 20, a refrigerant pipe (hereinafter also referred to as a connecting pipe) 25a connected to the outlet side of the internal heat exchanger 24b reaches the right internal heat exchanger 24a from the first capillary tube 23a. The refrigerant pipe 25 joins the refrigerant pipe 25 at a second junction P2 in the middle of the refrigerant pipe 25. That is, the main path 20 connects two internal heat exchangers 24 that evaporate the supplied refrigerant in series.

  The high-pressure refrigerant introduction path 30 is connected to the high-pressure side three-way valve 261 and the high-pressure side three-way valve 261, and joins the third junction P3 of the refrigerant pipe 25 on the inlet side of the left-inside heat exchanger 24c. This is a path constituted by the high-pressure refrigerant introduction pipe 31.

  The high pressure side three-way valve 261 has a first sending state in which the refrigerant compressed by the compressor 21 is sent to the external heat exchanger 22 and a second sending state in which the refrigerant compressed by the compressor 21 is sent to the high pressure introduction path. It is a switching valve that can be switched alternatively between. The switching operation of the high-pressure side three-way valve 261 is performed according to a command given from the control means 60. That is, the high-pressure refrigerant introduction path 30 is opened when the high-pressure side three-way valve 261 is in the second delivery state, and is closed when the high-pressure side three-way valve 261 is in the first delivery state.

  The heat radiation path 40 is branched at a first branch point P4 in the middle of the refrigerant line 25 connected to the outlet side of the left-side internal heat exchanger 24c, and reaches the external heat exchanger 22 from the compressor 21. 25 is a path constituted by the heat radiating pipe 41 connected to the refrigerant pipe 25 in a mode of merging at the 25th fourth merging point P5. The heat dissipation path 40 is for supplying the refrigerant condensed in the left-side heat exchanger 24 c to the external heat exchanger 22 and returning it to the main path 20. An electronic expansion valve 42, a heat radiation capillary tube 43, and a heat radiation check valve 441 are provided in the middle of the heat radiation path 41 constituting the heat radiation path 40. The electronic expansion valve 42 and the heat radiating capillary tube 43 are for adiabatically expanding the passing refrigerant.

  The bypass path 50 branches from the second branch point P6 in the middle of the refrigerant pipe 25 extending from the external heat exchanger 22 to the distributor 27, and in the middle of the refrigerant pipe 25 extending from the first junction P1 to the compressor 21. It is comprised by the bypass line 51 provided in the aspect which merges in the 5th merge point P7. The bypass pipe 51 is provided with a bypass valve 52. The bypass valve 52 is a valve body that can be opened and closed. When the opening command is given from the control means 60, the bypass valve 52 opens and allows the refrigerant to pass through the bypass pipe 51, while the control means 60 closes the closing command. Is closed to restrict the refrigerant from passing through the bypass line 51.

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

  First, as an example of a single cooling operation, a case where a CCC operation (an operation for cooling the internal air of all the commodity containers 3) is described.

  In this case, the control means 60 places the high-pressure side three-way valve 261 in the first delivery state and opens the low-pressure side solenoid valves 263 and 264 and the feedback solenoid valve 265, while closing the low-pressure side solenoid valve 262 and the bypass valve 52. . 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, it evaporates in the internal heat exchanger 24b and the left internal heat exchanger 24c, takes heat from the internal air of the product storage 3, and cools the internal air. The cooled internal air circulates in the interior by driving the internal blower fan F1 disposed in the vicinity of each internal heat exchanger 24, and the products accommodated in the internal storage 3b and the left storage 3c are Cooled to circulating internal air.

  The refrigerant evaporated in the internal heat exchanger 24b passes through the connecting line 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 in the right warehouse 3a is cooled by the right internal heat exchanger 24a, and circulates in the interior by the drive of the internal air blower fan F1, whereby the products stored in the right warehouse 3a are circulated internal air. To be cooled.

  The refrigerant evaporated in the right-side heat exchanger 24a and the left-side heat exchanger 24c joins at the first joining point P1, and is then sucked into the compressor 21 and then compressed, and the above-described circulation is repeated.

  Next, as an example of the cooling and heating operation, a 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) will be described.

  In this case, the control means 60 places the high-pressure side three-way valve 261 in the second delivery state and opens the low-pressure side solenoid valves 262 and 263, while closing the low-pressure side solenoid valve 264, the feedback solenoid valve 265 and the bypass valve 52. . As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG. Note that it is desirable that the degree of opening of the electronic expansion valve 42 provided in the heat radiating pipe 41 be increased to such an extent that the refrigerant is not adiabatically expanded.

  The refrigerant compressed by the compressor 21 passes through the high-pressure refrigerant introduction pipe 31 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 inside the left warehouse 3c by driving the internal blower fan F1, 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-dissipating pipe 41 constituting the heat-dissipating path 40 and is adiabatically expanded in the heat-dissipating capillary tube 43, and then reaches the external heat exchanger 22 to be outside the box. The heat exchanger 22 exchanges heat with ambient air. The refrigerant that has passed through the external heat exchanger 22 is adiabatically expanded in the first capillary tube 23 a and the second capillary tube 23 b via the distributor 27.

  The refrigerant adiabatically expanded in the second capillary tube 23b reaches the internal heat exchanger 24b, evaporates in the internal heat exchanger 24b, takes heat from the internal air of the internal chamber 3b, and cools the internal air. To do. The cooled internal air circulates through the interior of the intermediate store 3b by driving the internal blower fan F1, thereby cooling the product accommodated in the intermediate store 3b. The refrigerant evaporated in the internal heat exchanger 24b passes through the connecting pipe line 25a and reaches the upstream side of the right internal heat exchanger 24a.

  On the other hand, the refrigerant adiabatically expanded in the first capillary tube 23a merges with the refrigerant evaporated in the internal heat exchanger 24b at the second junction P2 to reach the right internal heat exchanger 24a, and the right internal heat exchange. It evaporates in the vessel 24a. As a result, the internal air in the right warehouse 3a is cooled by the right internal heat exchanger 24a, and circulates in the interior by the drive of the internal air blower fan F1, whereby the products stored in the right warehouse 3a are circulated internal air. To be cooled.

  The refrigerant evaporated in the right-side heat exchanger 24a is sucked into the compressor 21 and then compressed, and the above-described circulation is repeated.

  Furthermore, the case where the driving | running which heats internal air of only the left store | warehouse | chamber 3c is performed as an example of heating independent operation | movement is demonstrated.

  In this case, the control means 60 places the high pressure side three-way valve 261 in the second delivery state, opens the bypass valve 52, and closes the low pressure side solenoid valves 262, 263, 264 and the feedback solenoid valve 265. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG. Note that the control means 60 adjusts the opening degree so as to achieve a desired throttle amount so that the refrigerant passing through the electronic expansion valve 42 provided in the heat radiating pipe 41 is adiabatically expanded.

  The refrigerant compressed by the compressor 21 passes through the high-pressure refrigerant introduction pipe 31 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 inside the left warehouse 3c by driving the internal blower fan F1, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the left internal heat exchanger 24c passes through the heat radiation pipe 41 constituting the heat radiation path 40 and is adiabatically expanded by the electronic expansion valve 42 and the heat radiation capillary tube 43. Finally, heat exchange with ambient air is performed in the external heat exchanger 22. The refrigerant that has passed through the external heat exchanger 22 passes through the bypass pipe 51 and is then sucked into the compressor 21 and is then compressed to repeat the above-described circulation.

  As described above, according to the refrigerant circuit device according to the present embodiment, when the control means 60 performs the cooling and heating operation, the low pressure side electromagnetic valve while the high pressure side three-way valve 261 is in the second delivery state. Since 262 and 263 are opened, not only the refrigerant that has passed through the internal heat exchanger 24b but also the refrigerant that has been adiabatically expanded by the first capillary tube 23a can be passed through the right internal heat exchanger 24a. Therefore, the internal air of the right warehouse 3a can be cooled at the same time as the internal air of the middle warehouse 3b is cooled, and the time when the internal air of the right warehouse 3a falls below a predetermined cooling completion temperature is determined. Can be close to a point in time when the temperature falls below a predetermined cooling completion temperature. Thereby, the drive time of the compressor 21 can be shortened and power consumption can be reduced as a result. Therefore, in the case of performing the cooling and heating operation, the power consumption can be reduced to save energy.

  According to the above refrigerant circuit device, when performing the single cooling operation, the refrigerant that has passed through the internal heat exchanger 24b passes through the right internal heat exchanger 24a. Refrigerant that passes through the right-side heat exchanger 24a even if the throttle amounts of the first capillary tube 23a, the second capillary tube 23b, and the third capillary tube 23c are adjusted to an optimum size when performing the cooling and heating operation. Is adiabatically expanded by the second capillary tube 23b having the largest throttle amount, and as a result, the evaporation temperature can be lowered and the internal air of the right chamber 3a can be cooled well.

  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 tubes 23a and the like constituting the mechanism 23 and the internal heat exchangers 24 can be reduced. Thereby, the quantity of the heat insulating material which covers the outer peripheral area of the refrigerant pipe line 25 between the expansion mechanism 23 and each heat exchanger 24 can be reduced, thereby reducing the manufacturing cost. .

  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.

  In the above-described embodiment, the refrigerant circuit device having the three internal heat exchangers 24 has been described. However, in the present invention, four or more internal heat exchangers may be included. . In this case, the internal heat exchanger disposed in the chamber to be heated becomes the first internal heat exchanger, and the upstream side of the internal heat exchangers connected in series among the remaining three or more is the first. It becomes a 2 internal heat exchanger, and a downstream becomes a 3rd internal heat exchanger.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 20 Main path 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 line 261 High pressure side three-way valve 262 Low pressure Side solenoid valve 263 Low pressure side solenoid valve 264 Low pressure side solenoid valve 265 Return solenoid valve 30 High pressure refrigerant introduction path 31 High pressure refrigerant introduction pipe 40 Heat radiation path 41 Heat radiation pipe 50 Bypass path 51 Bypass pipe 52 Bypass valve 60 Control means

Claims (3)

A plurality of in-compartment heat exchangers arranged for each target room, a compressor for sucking and compressing refrigerant, an out-of-compartment heat exchanger arranged outside the chamber, and the inside heat A plurality of capillary tubes for adiabatically expanding the refrigerant that has passed through the external heat exchanger on each upstream side of the exchanger, and an openable / closable upstream of each capillary tube so as to correspond to each internal heat exchanger A main path having a connected solenoid valve;
A high pressure for delivering the refrigerant compressed by the compressor by opening an introduction valve provided to itself to a first internal heat exchanger disposed in a chamber to be heated among the internal heat exchangers A refrigerant introduction path;
A heat dissipation path for supplying the refrigerant sent to the first internal heat exchanger to the upstream side of the external heat exchanger in the main path,
The main path is connected to the inlet side of the other third internal heat exchanger through the refrigerant line connected to the outlet side of the second internal heat exchanger of the internal heat exchangers. In the refrigerant circuit device formed by connecting at least two internal heat exchangers in series by joining the refrigerant pipes,
Heating the internal air of the chamber in which the first internal heat exchanger is disposed, and the internal air of each chamber in which the second internal heat exchanger and the third internal heat exchanger are disposed When performing a cooling heating operation for cooling, the electromagnetic valve corresponding to the first internal heat exchanger is closed, while corresponding to the second internal heat exchanger and the third internal heat exchanger. A refrigerant circuit device comprising control means for opening an electromagnetic valve and opening the introduction valve.   The control means, when performing a single cooling operation for cooling the internal air of all the chambers, while closing the introduction valve and closing the electromagnetic valve corresponding to the third internal heat exchanger, The refrigerant circuit device according to claim 1, wherein electromagnetic valves corresponding to the first internal heat exchanger and the second internal heat exchanger are opened. A bypass line arranged in a manner to be separated from a refrigerant line connected to the outlet side of the external heat exchanger and merged with a refrigerant line connected to the inlet side of the compressor;
When opened and opened in the bypass pipeline, the refrigerant is allowed to pass through the bypass pipeline, while when closed, the refrigerant is restricted from passing through the bypass pipeline. A bypass valve;
A heat dissipating expansion mechanism configured to adiabatically expand the refrigerant that constitutes the heat dissipating path and that has passed through the first internal heat exchanger;
The control means closes the electromagnetic valve, and performs the introduction valve and the bypass when performing a single heating operation for heating only the internal air of the chamber in which the first internal heat exchanger is disposed. The refrigerant circuit device according to claim 1, wherein the valve is opened.

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