JP5915364B2 - Refrigerant circuit device - Google Patents

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 internal heat exchanger, a compressor, an external heat exchanger, and an expansion mechanism through a refrigerant pipe.

  The in-compartment heat exchanger is disposed inside the commodity storage of the vending machine. This internal heat exchanger cools the internal air (internal atmosphere) of the product storage, as the supplied refrigerant passes through a predetermined flow path and evaporates.

  The compressor is installed in the machine room inside the vending machine main body and outside the product container. The compressor sucks the refrigerant evaporated by the internal heat exchanger, compresses the sucked refrigerant, In this state, the liquid is discharged.

  The external heat exchanger 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 radiating the introduced refrigerant, that is, It dissipates heat to the surrounding air.

  The expansion mechanism is disposed in the machine room in the same manner as the compressor and the external heat exchanger, and adiabatically expands by depressurizing the refrigerant radiated by the external heat exchanger.

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

  The radiator is connected to the refrigerant pipe connected to the outlet side of the heat exchanger for heating and connected to the refrigerant pipe connecting the external heat exchanger and the expansion mechanism and connected to the refrigerant pipe. Is connected to the exit side. Such a radiator introduces the refrigerant radiated by the heat exchanger for heating and causes the introduced refrigerant to radiate heat by exchanging heat with ambient air.

  In such a refrigerant circuit, a cooling electromagnetic valve and a heating electromagnetic valve are respectively provided in the refrigerant piping from the compressor to the external heat exchanger and the piping from the compressor to the heating heat exchanger. The cooling solenoid valve is opened when a cooling operation is performed to cool the internal atmosphere of all the product containers provided with the internal heat exchanger, and the refrigerant compressed by the compressor flows to the external heat exchanger. On the other hand, it is closed in the case of other operations, and the refrigerant compressed by the compressor is restricted from flowing to the external heat exchanger. On the other hand, the heating solenoid valve is opened when performing a heat pump operation that heats the internal atmosphere of one of the commodity containers provided with a heating heat exchanger and cools the internal atmosphere of the other commodity container, While the refrigerant compressed by the compressor is allowed to flow to the heating heat exchanger, it is closed in other operations, and the refrigerant compressed by the compressor is allowed to flow to the heating 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, although not clearly shown in the above-mentioned Patent Document 1, the above refrigerant circuit device is a case where the internal air of all the product containers is cooled in a state where the outside air temperature is high, for example, in summer. When the cooling load of each product storage is large, that is, when the cooling load is high, the refrigerant sucked into the compressor, that is, the refrigerant returning from the internal heat exchanger to the compressor becomes high temperature. As a result, the compressor may stop abnormally due to overload.

  Therefore, in order to prevent the compressor from being overloaded, the refrigerant circulates only in the internal heat exchangers of some product storage units without simultaneously cooling the internal air of all the product storage units. It is possible to do.

  However, in the refrigerant circuit, the refrigerant filling amount is determined so that the internal air of all the product containers can be efficiently cooled, and the refrigerant circulates only to one internal heat exchanger at a high cooling load. In this case, the amount of refrigerant becomes excessive, leading to a reduction in efficiency due to an increase in high pressure in the refrigerant circuit, and as a result, the compressor may be abnormally stopped.

  In view of the above circumstances, an object of the present invention is to provide a refrigerant circuit device that can prevent a compressor from being abnormally stopped due to an overload even at a high cooling load.

In order to achieve the above object, the refrigerant circuit device according to the present invention is provided in each of the two target chambers, and the target chamber in which the refrigerant is adiabatically expanded by the expansion mechanism to evaporate the refrigerant. An internal heat exchanger that cools the internal atmosphere, a compressor that sucks and compresses the refrigerant evaporated in the internal heat exchanger, and an external part that introduces the refrigerant compressed by the compressor and dissipates heat In a refrigerant circuit device including a refrigerant circuit configured by connecting a heat exchanger to a refrigerant pipe, the inside of the chamber that is provided inside the target chamber and blows the internal atmosphere of the target chamber in which the target chamber is provided In the case where the outside air temperature exceeds a predetermined reference outside air temperature when the air blowing means and the outside air temperature exceed a preset internal temperature set in advance, or the heat radiation temperature of the refrigerant in the outside heat exchanger Is preset When the above setting radiator temperature, or when rapid cooling operation for rapidly cooling each of the internal atmosphere of the target chamber is performed, while maintaining the supply of refrigerant to each of the internal heat exchanger, the one It drives the storage room blowing means that for the other storage room blowing means in the driving stop, the internal temperature of all of the target chamber alternates every predetermined time to below the release temperature is a predetermined threshold value control Means.

  In the refrigerant circuit device according to the present invention, carbon dioxide is used as the refrigerant.

  According to the refrigerant circuit device of the present invention, when the outside air temperature exceeds a predetermined reference outside air temperature, when each internal temperature of the target chamber exceeds a preset internal temperature, or in the outside heat exchanger When the heat radiation temperature of the refrigerant exceeds a preset heat radiation temperature, or when a rapid cooling operation for rapidly cooling the internal atmosphere of the target chamber is performed, the control means supplies the refrigerant to the internal heat exchanger. Since the internal air blowing means is alternately driven every predetermined time while maintaining the supply, the total amount of air blown by the internal air blowing means can be reduced and the refrigerant sucked by the compressor, that is, It can suppress that the refrigerant | coolant which returns to a compressor from an internal heat exchanger becomes high temperature. Therefore, it is possible to prevent the compressor from being abnormally stopped due to overload even at a high cooling load.

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 block diagram showing a characteristic control system of 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 flowchart showing the processing contents of the fan drive control processing performed by the fan control unit shown in FIG. FIG. 7 is a flowchart showing the processing contents of the supercooling load determination process in the fan drive control process shown in FIG. FIG. 8 is a flowchart showing the processing contents of the internal blower fan alternating drive process in the fan drive control process shown in FIG. FIG. 9 is a flowchart showing the processing contents of the release determination process in the internal blower fan alternating drive process shown in FIG.

  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 two independent commodity storage boxes 3 partitioned by, for example, a heat insulating partition plate 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 store 3a) is shown, but the internal structure of the left product storage 3 (hereinafter also referred to as the left store 3b, as appropriate) The configuration is substantially the same. 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 has a refrigerant circuit 10 in which carbon dioxide is enclosed as a refrigerant. The refrigerant circuit 10 includes a compressor 21, an external heat exchanger 22, a first capillary tube 23, and The internal heat exchanger 24 is sequentially connected by a refrigerant pipe 25.

  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-pressure refrigerant), and discharges it from the discharge port.

  The compressor 21 in the present embodiment is a two-stage compressor that performs a compression operation in two steps. More specifically, the compressor 21 includes a first compression element 211 that performs a first compression operation and a second compression element 212 that performs a second compression operation, and an intermediate portion (not shown) therebetween. A heat exchanger is provided. The intermediate heat exchanger radiates the refrigerant compressed by the first compression operation by the first compression element 211 and sends it to the second compression element 212.

  As shown in FIG. 2, the external heat exchanger 22 is disposed in the machine room 9 similarly to the compressor 21. When the refrigerant compressed by the compressor 21 passes through its flow path, the external heat exchanger 22 exchanges heat with ambient air to dissipate heat.

  The first capillary tube 23 is disposed in the machine room 9 similarly to the compressor 21 and the external heat exchanger 22. The first capillary tube 23 constitutes an expansion mechanism that adiabatically expands by reducing the pressure of the passing refrigerant.

  A plurality (two in the illustrated example) of the internal heat exchangers 24 are provided, and each of the internal heat exchangers 24 is disposed on the front side of the rear duct D in the interior low region of each commodity storage 3. The refrigerant piping 25 connecting the internal heat exchanger 24 and the first capillary tube 23 is branched into two by a distributor 26 disposed in the middle thereof, and the internal heat disposed in the right warehouse 3a. Connected to the inlet side of the exchanger 24 (hereinafter also referred to as the right-side heat exchanger 24a) and the internal heat exchanger 24 (hereinafter also referred to as the left-side heat exchanger 24b) disposed in the left case 3b. It is. These internal heat exchangers 24 evaporate the refrigerant that passes therethrough and cool the internal air (internal atmosphere) of the commodity storage 3.

  In the refrigerant pipe 25, electromagnetic valves 271 and 272 and second capillary tubes 281 and 282 are respectively provided on the way from the distributor 26 to the internal heat exchangers 24. The electromagnetic valves 271 and 272 are openable and closable valve bodies, which open when an opening command is given from a control unit (not shown) and allow the refrigerant to pass therethrough, while when a closing command is given. It closes and regulates the passage of refrigerant. The second capillary tubes 281 and 282 are disposed inside each product storage 3 and constitute an expansion mechanism that adiabatically expands by reducing the pressure of the refrigerant passing therethrough, like the first capillary tube 23.

  The refrigerant pipe 25 connected to the outlet side of each internal heat exchanger 24 is connected to the compressor 21 in such a manner that the refrigerant pipe 25 joins at the middle first joining point P1 and communicates with the suction port of the compressor 21. .

  In addition, the code | symbols H, 29, F1, and F2 in FIG. 3 are a heater, an internal heat exchanger, an internal fan, and an external fan, respectively. The heater H is a heating means that is disposed in the left warehouse 3b and that heats the internal air of the left warehouse 3b when driven and energized. The internal heat exchanger 29 exchanges heat between the high-pressure refrigerant that has passed through the external heat exchanger 22 and the refrigerant (low-pressure refrigerant) that has passed through the internal heat exchanger 24. The internal blower fan F <b> 1 is disposed in the vicinity of the internal heat exchanger 24 inside each commodity storage 3, and is an internal blower that blows the internal air of the commodity storage 3 by driving. The outside blower fan F2 is disposed near the outside heat exchanger 22 and is a blower that blows air so as to pass outside air around the outside blower fan F2 when driven.

  FIG. 4 is a block diagram showing a characteristic control system of the refrigerant circuit device according to the embodiment of the present invention. As shown in FIG. 4, the refrigerant circuit device includes an outside air temperature sensor S <b> 1, an interior temperature sensor S <b> 2, a heat radiation temperature sensor S <b> 3, and a fan control unit 30.

  The outside air temperature sensor S1 is the outside air temperature of the vending machine to which the refrigerant circuit device is applied. More specifically, the outside air temperature is blown toward the outside heat exchanger 22 by driving the outside blowing fan F2 ( The outside air temperature) T is detected. The outside air temperature sensor S1 gives the detected outside air temperature T to the fan control unit 30 as a detection signal. The in-compartment temperature sensor S2 is disposed inside each commodity storage 3, and detects the in-compartment temperature (internal temperature) t1 of the commodity storage 3 in which it is disposed. These internal temperature sensors S2 give the detected internal temperature t1 to the fan control unit 30 as a detection signal. The heat radiation temperature sensor S3 detects the heat radiation temperature t2 of the refrigerant in the external heat exchanger 22. The heat radiation temperature sensor S3 gives the detected heat radiation temperature t2 to the fan control unit 30 as a detection signal.

  The fan control unit 30 controls the driving of the internal fan F1 according to programs and data stored in the memory 38, and includes an input processing unit 32, a determination processing unit 34, and a fan drive processing unit 36. is there. The fan control unit 30 may be configured integrally with a control unit that controls driving of the electromagnetic valves 271 and 272, or may be configured independently of the control unit. Also good. In the present embodiment, the fan control unit 30 is configured independently of the control unit, and further configured independently of the vending machine control unit 40 that controls the sales operation of the vending machine. Will be described.

  The memory 38 stores reference outside air temperature information, set internal temperature information, set heat radiation temperature information, release temperature information, and the like in addition to the above-described program.

  The reference outside air temperature information includes a reference outside air temperature Ts (for example, 38 ° C.) which is a precondition for determining the high cooling load state.

  The set internal temperature information includes a set internal temperature ti (for example, 20 ° C.) that serves as a threshold value for determining whether or not the product is in a high cooling load state based on the internal temperature in each commodity storage 3.

  The set heat radiation temperature information includes a set heat radiation temperature tc that serves as a threshold for determining whether or not a high cooling load state is based on the heat radiation temperature of the refrigerant in the external heat exchanger 22.

  The release temperature information includes a release temperature tic that is a threshold value for determining that the high cooling load state has been released based on the internal temperature in each commodity storage 3. The release temperature tic is a temperature lower than the set internal temperature ti.

  The input processing unit 32 is used to input detection signals given from the sensors S1 to S3 every time a preset time elapses and to input a command from the vending machine control unit 40. The determination processing unit 34 determines whether or not the vehicle is in a high load cooling state based on the detection signal or command input through the input processing unit 32 and various temperature information read from the memory 38. The fan drive processing unit 36 individually drives or stops driving the internal blower fan F1 of each product storage case 3.

  The refrigerant circuit device having the above configuration cools the product stored in the product storage 3 as follows. Here, the case where the cooling operation which cools the internal air of all the goods storage 3 is performed is demonstrated.

  In this case, the control unit opens the electromagnetic valves 271 and 272. As a result, the refrigerant compressed by the compressor 21 reaches the external heat exchanger 22 as shown in FIG. The refrigerant that has reached the external heat exchanger 22 performs heat exchange with ambient air (outside air) while passing through the external heat exchanger 22, and dissipates heat. The refrigerant radiated by the external heat exchanger 22 is adiabatically expanded in the first capillary tube 23 after passing through the internal heat exchanger 29.

  The refrigerant which is adiabatically expanded and vaporized by the first capillary tube 23 is branched into two by the distributor 26 and further adiabatically expanded by the second capillary tubes 281 and 282, and the right internal heat exchanger 24a and the left internal heat. It reaches the exchanger 24b, evaporates in each internal heat exchanger 24, takes heat from the internal air of the commodity storage 3, and cools the internal air. The cooled internal air circulates in the interior by driving the internal blower fan F1, whereby the products stored in each product storage 3 are cooled to the circulating internal air.

  The refrigerant evaporated in each internal heat exchanger 24 joins at the first junction P1, and then is sucked into the compressor 21 through the internal heat exchanger 29, is compressed by the compressor 21, and repeats the circulation described above.

  When performing the cooling operation described above, the fan control unit 30 performs the following fan drive control process.

  FIG. 6 is a flowchart showing the processing contents of the fan drive control process performed by the fan control unit 30.

  When the outside air temperature T is input from the outside air temperature sensor S1 through the input processing unit 32 (step S100: Yes), the fan control unit 30 reads the reference outside air temperature information from the memory 38 through the determination processing unit 34, and the outside air temperature T The reference outside air temperature Ts included in the reference outside air temperature information is compared (step S200). When the outside air temperature T becomes equal to or lower than the reference outside air temperature Ts (step S200: No), the fan control unit 30 returns the procedure without performing the process described later, and ends the current fan drive control process.

  When the outside air temperature T exceeds the reference outside air temperature Ts (step S200: Yes), the fan control unit 30 performs a supercooling load determination process (step S300).

  FIG. 7 is a flowchart showing the processing contents of the supercooling load determination process in the fan drive control process shown in FIG.

  In this supercooling load determination process, when the fan control unit 30 inputs the internal temperature t1 from each internal temperature sensor S2 through the input processing unit 32 (step S301: Yes), the internal setting is made from the memory 38 through the determination processing unit 34. The temperature information is read, and all the internal temperatures t1 are compared with the set internal temperature ti (step S302).

  If all the internal temperatures t1 are higher than the set internal temperature ti (step S302: Yes), the fan control unit 30 determines that there is a supercooling load state through the determination processing unit 34 (step S303), and thereafter Return the procedure to end the current process.

  If all the internal temperatures t1 do not exceed the set internal temperature ti (step S302: No), the fan control unit 30 returns the procedure without determining that it is in the supercooling load state, and ends the current process.

  On the other hand, when the fan control unit 30 inputs the heat radiation temperature t2 from the heat radiation temperature sensor S3 through the input processing unit 32 without inputting the inside temperature t1, the fan control unit 30 passes through the determination processing unit 34. The set heat radiation temperature information is read from the memory 38, and the heat radiation temperature t2 is compared with the set heat radiation temperature tc (step S305).

  If the heat dissipation temperature t2 is higher than the set heat dissipation temperature tc (step S305: Yes), the fan control unit 30 determines that the supercooling load is present through the determination processing unit 34 (step S306), and then returns the procedure. To end the current process.

  If the heat dissipation temperature t2 does not exceed the set heat dissipation temperature tc (step S305: No), the fan control unit 30 returns the procedure without determining that the supercooling load state is present, and ends the current process.

  Further, the fan control unit 30 receives a rapid operation command from the vending machine control unit 40 through the input processing unit 32 without inputting the internal temperature t1 and the heat radiation temperature t2 (step S301: No, step S304: No, step S307). : Yes), it is determined through the determination processing unit 34 that it is in a supercooling load state (step S308), and then the procedure is returned to end the current process. Here, the rapid operation is referred to as so-called pull-down operation. After the outer door 4 and the inner door 5 are moved open to replenish products in the product storage rack 6 of each product storage 3, the outer door 4 and the inner door 5 are operated. In this operation, the door 5 is closed again to rapidly cool the internal air of each commodity storage 3.

  When none of the inside temperature t1, the heat radiation temperature t2, and the rapid cooling operation command is input (Step S301: No, Step S304: No, Step S307: No), the fan control unit 30 determines that the supercooling load state is present. Don't, return the procedure and end the current process.

  As a result of performing such a supercooling load determination process, when it is determined that the state is a supercooling load state (step S400: Yes), the fan control unit 30 performs an internal blower fan alternate drive process (step S500). ).

  FIG. 8 is a flowchart showing the processing contents of the internal blower fan alternating drive process in the fan drive control process shown in FIG.

  In this internal blower fan alternate drive process, the fan control unit 30 passes through the fan drive processing unit 36 until the preset time (for example, 30 seconds) elapses, and the internal blower fan F1 (hereinafter, the right storehouse) of the right store 3a. The internal air blower fan F1 (also referred to as the left internal air blower fan F1) is stopped (step S501, step S502: No).

  When the set time has elapsed (step S502: Yes), the fan control unit 30 drives the left internal blower fan F1 through the fan drive processing unit 36 until the set time elapses, and the right internal blower fan F1 is turned on. The drive is stopped (step S503, step S504: No).

  After driving any one of the internal blower fans F1 alternately in this way, the fan control unit 30 performs a release determination process (step S505).

  FIG. 9 is a flowchart showing the processing contents of the release determination process in the internal blower fan alternating drive process shown in FIG.

  In this release determination process, when the fan control unit 30 inputs the internal temperature t1 from each internal temperature sensor S2 through the input processing unit 32 after a predetermined time has elapsed (step S505a: Yes), the release temperature information read from the memory 38. Is compared with the internal temperature t1 (step S505b).

  When the internal temperature t1 of all the product containers 3 is lower than the release temperature tic (step S505b: Yes), the fan control unit 30 determines that the high cooling load state has been released through the determination processing unit 34, and determines the release. (Step S505c), and then the procedure is returned to end the current process.

  On the other hand, if the internal temperature t1 of all the product containers 3 is not lower than the release temperature tic (step S505b: No), the fan control unit 30 returns the procedure thereafter without performing the release determination, and performs the current process. Exit.

  By performing such a release determination process, the fan control unit 30 repeats the processes in steps S501 to S504 described above until a release determination is made (step S506: No). When the fan control unit 30 makes a release determination in the release determination process (step S506: Yes), the fan control unit 30 stops driving all the internal blower fans F1 through the fan drive processing unit 36 (step S507), and then performs the procedure. Is returned to end the current blower fan alternate drive process.

  The fan control part 30 which implemented this internal ventilation fan alternating drive process returns a procedure after that, and complete | finishes this fan drive control process.

  By performing this fan drive control process, even when the outside air temperature T exceeds the reference outside air temperature Ts, the inside temperature of each product storage case 3 can be sufficiently reduced, and the detection result of the inside temperature thereafter. Accordingly, it is possible to shift to a normal cooling operation in which the internal blower fan F1 is driven.

  As described above, according to the refrigerant circuit device of the present embodiment, when the outside air temperature T exceeds the reference outside air temperature Ts, when each inside temperature t1 exceeds the set internal temperature ti or the heat radiation temperature t2 When the set heat radiation temperature tc is exceeded, or when a rapid cooling operation command is given, it is determined that a high cooling load state is present. And when it is judged that it is such a high cooling load state, by repeating supply of the internal blower fan F1 every set time while maintaining the supply of the refrigerant to the internal heat exchanger 24, Since the total amount of air blown by the internal fan F1 is reduced, the refrigerant sucked by the compressor 21, that is, the refrigerant returning from the internal heat exchanger 24 to the compressor 21 is prevented from becoming a high temperature. can do. Therefore, it is possible to prevent the compressor 21 from being abnormally stopped due to overload even at a high cooling load.

  As described above, the compressor 21 can be prevented from abnormally stopping even under a high cooling load, and as a result, the internal air of each commodity storage 3 can be cooled well.

  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 embodiment described above, in the internal blower fan alternate drive process, the internal blower fan F1 is alternately driven every set time, thereby reducing the total amount of air blown by the internal blower fan F1. However, in the present invention, the internal air blowing means of the product storage case 3 having a large deviation from the reference internal temperature which is a preset threshold value by comparing the internal temperature and the reference internal temperature. May be driven with priority.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 21 Compressor 22 External heat exchanger 23 1st capillary tube 24 Internal heat exchanger 25 Refrigerant piping 26 Distributor 30 Fan control part 32 Input processing part 34 Judgment processing part 36 Fan drive processing part 38 Memory 40 Vending machine Control unit F1 Internal blower fan F2 External blower fan S1 Outside air temperature sensor S2 Inside temperature sensor S3 Heat radiation temperature sensor

Claims (2)

An internal heat exchanger for evaporating the refrigerant adiabatically expanded by the expansion mechanism and cooling the internal atmosphere of the target chamber in which the target chamber is disposed,
A compressor that sucks and compresses the refrigerant evaporated in the internal heat exchanger;
In a refrigerant circuit device including a refrigerant circuit configured by connecting a refrigerant compressed by the compressor and dissipating heat from an external heat exchanger connected by a refrigerant pipe,
In-compartment blowing means for blowing the internal atmosphere of the target chamber provided inside each of the target chambers and provided therein,
When the outside air temperature exceeds a predetermined reference outside air temperature, when the internal temperature of each of the target chambers exceeds a preset internal temperature, or the heat release temperature of the refrigerant in the external heat exchanger is preset. When the temperature exceeds the set heat dissipation temperature, or when a rapid cooling operation for rapidly cooling the internal atmosphere of each of the target chambers is performed , while maintaining the supply of the refrigerant to each internal heat exchanger, that the inner blower means is driven to the other storage room blowing means to driving stop, the internal temperature of all of the target chamber alternates every predetermined time to below the release temperature is a predetermined threshold value control means A refrigerant circuit device comprising:   The refrigerant circuit device according to claim 1, wherein carbon dioxide is used as the refrigerant.

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