JP6705141B2 - vending machine - Google Patents

Description

The present invention relates to an automatic vending machine, and more particularly to an automatic vending machine configured to use an internal heat exchanger as a condenser and an external heat exchanger as an evaporator during heating operation.

BACKGROUND ART Conventionally, there is known an automatic vending machine including an internal heat exchanger that heats the inside of a storage by condensing a refrigerant discharged from a compressor during a heating operation (for example, see Patent Document 1).

In Patent Document 1 described above, an internal heat exchanger (internal heat exchanger) corresponding to a heating chamber (housing) to be heated during a heating operation is used as a condenser, and a canister containing canned beverage is stored in the chamber. There is disclosed a heat pump type vending machine for heating. The vending machine described in Patent Document 1 is configured so that the refrigerant flow in a refrigerant circuit in which a compressor, a condenser, an expansion valve, and a plurality of evaporators are connected in parallel can be switched using a plurality of solenoid valves. Has been done. As a result, during the heating operation, the refrigerant that has absorbed heat in the storage chamber (storage) to be cooled is condensed (radiated) in the storage chamber (storage) to be heated. Therefore, the canned beverage in the chamber to be cooled is cooled and the canned beverage in the chamber to be heated is heated.

JP, 2002-269630, A

In the vending machine described in Patent Document 1 described above, in order to obtain a larger heating capacity, not only the internal heat exchanger (internal heat exchanger) but also the external heat exchanger (external heat exchanger) is vaporized. It is conceivable that the device functions as a container. That is, after the heat of the atmosphere (outside air) is absorbed by the refrigerant via the external heat exchanger, the refrigerant is moved to the internal heat exchanger arranged in the chamber (housing) to be heated and radiated. As a result, a method of securing the heat source of the heating chamber can be adopted. However, when the external heat exchanger functions as an evaporator, water contained in the atmosphere (outside air) may be cooled and frozen (icing) when passing through the external heat exchanger. In particular, under a low outside air temperature (ambient temperature) condition, so-called frost (ice) adheres to the external heat exchanger (external heat exchanger), fins are clogged, and the performance of the external heat exchanger deteriorates. Therefore, the heat absorption of the external heat exchanger is not sufficiently performed, so that the heat source of the storage object to be heated cannot be stably obtained (the heating capacity of the storage object decreases). There is.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a heating operation system for obtaining atmospheric heat by using an outside heat exchanger in a low outside air temperature condition. It is also to provide an automatic vending machine capable of stably obtaining the heating capacity of the storage.

An automatic vending machine according to one aspect of the present invention includes a compressor that compresses a refrigerant, an internal heat exchanger that heats the inside of the storage by condensation heat when the high-temperature refrigerant discharged from the compressor is condensed, An external heat exchanger that evaporates the refrigerant that is condensed and adiabatically expanded by the internal heat exchanger, and a first flow path that causes the high-temperature refrigerant that is discharged from the compressor to flow in the order of the internal heat exchanger and the external heat exchanger. From the compressor to the second flow path that allows the high-temperature refrigerant to flow from the compressor to the external heat exchanger without passing through the internal heat exchanger, the inside of the storage compartment using the first flow path. The defrosting operation that uses the second flow path to melt the frost adhering to the outside heat exchanger during the independent heating operation is performed , and the refrigerant discharged from the outside heat exchanger is used as the inside heat. And a control unit that performs a cooling independent operation of circulating the air through the exchanger to the compressor , and the second flow path directly connects the discharge side of the compressor and the inlet side of the outside heat exchanger. It includes a bypass flow passage and a refrigerant return flow passage that directly connects the outlet side of the outdoor heat exchanger and the suction side of the compressor, and the bypass flow passage has a high temperature during the cooling only operation and the defrosting operation. The refrigerant is configured to flow , and the refrigerant return passage is configured to allow the refrigerant discharged from the outside heat exchanger to flow during the heating only operation and the defrosting operation .

In the vending machine according to one aspect of the present invention, as described above, the high-temperature refrigerant is supplied to the in-compartment heat exchanger from the first flow path that causes the high-temperature refrigerant to flow in the order of the in-compartment heat exchanger and the out-of-compartment heat exchanger. By switching the refrigerant flow path to the second flow path that allows the compressor to flow to the external heat exchanger without passing through, the external heat exchange is performed during the heating operation for heating the inside of the storage using the first flow path. Cooling that performs defrosting operation that melts the frost adhering to the vessel using the second flow path and also allows the refrigerant discharged from the outside heat exchanger to flow to the compressor via the inside heat exchanger. Provide a control unit that operates independently . This allows the external heat exchanger to function as an evaporator so that the refrigerant absorbs atmospheric heat and the internal heat exchanger radiates the heat to heat the inside of the storage chamber, thereby adhering to the external heat exchanger. It is possible to maintain the performance of the outside heat exchanger by performing the defrosting operation in which the frost (ice) that has been melted is melted by the high-temperature refrigerant (hot gas). As a result, the heating capacity of the storage can be stably obtained even in the heating operation system in which the outside heat exchanger is used to obtain atmospheric heat under low outside temperature conditions.
In addition, the second flow path connects a bypass flow path that directly connects the discharge side of the compressor and the inlet side of the outside heat exchanger, the outlet side of the outside heat exchanger and the suction side of the compressor. And a refrigerant return flow path that is directly connected. Then, the bypass passage is configured so that the high-temperature refrigerant flows during the cooling only operation and the defrosting operation. Then, the refrigerant return flow path is configured so that the refrigerant discharged from the outside heat exchanger flows during the heating only operation and the defrosting operation. According to this structure, a small closed circuit (a small closed circuit including a bypass flow path and a refrigerant return flow path) that continuously circulates high-temperature refrigerant (hot gas) between the compressor and the outside heat exchanger in a short time. Since the second flow path can be used in the defrosting operation in the circuit), the frost (ice) attached to the outside heat exchanger can be quickly melted. That is, since the defrosting operation time can be further shortened, the heating operation using the outside heat exchanger as the evaporator can be quickly returned to. As a result, it is possible to prevent the temperature of the housing to be heated from fluctuating (decreasing) significantly due to the defrosting operation.

In the vending machine according to the above aspect, preferably, the outdoor heat exchanger blower for supplying outside air to the outdoor heat exchanger is further provided, and the control unit is in a state in which the outdoor heat exchanger blower is stopped. Is configured to perform defrosting operation. With this configuration, the heat exchange between the outside heat exchanger and the outside air can be stopped during the defrosting operation, so that the heat of the high-temperature refrigerant (hot gas) discharged from the compressor is wasted to the outside air. It can be effectively (efficiently) transmitted to the outside heat exchanger without letting it escape. Therefore, the frost (ice) attached to the outside heat exchanger can be quickly melted.

In the vending machine according to the above aspect, preferably, the control unit is based on at least one of the temperature of the outside air temperature, the temperature of the outside heat exchanger, and the temperature of the inside heat exchanger or the temperature change tendency. The control for starting the defrosting operation is performed. According to this structure, the defrosting operation of the outside heat exchanger can be executed after surely grasping the defrosting operation start condition that actually requires the defrosting operation of the outside heat exchanger. Therefore, the outside heat exchanger can be defrosted in the minimum required defrosting operation time (number of times of defrosting operation). It is possible to avoid the temperature of the target storage box from fluctuating (decreasing) significantly.

In the configuration further comprising the outside heat exchanger blower unit, preferably, the control unit, after starting the outside heat exchanger blower unit is stopped immediately before the defrosting operation is finished, the refrigerant flow path. It is configured to perform control to return to the heating independent operation by switching from the second flow path to the first flow path. According to this structure, the moisture (steam) of the frost (ice) melted by the defrosting operation is used before returning to the heating independent operation by using the air supplied by the outside heat exchanger air blower. Can be reliably removed (blown off) from the exchanger. That is, since it is possible to return to the heating independent operation in which the outside heat exchanger is used as an evaporator after the outside heat exchanger is dried, it is possible to newly start frost formation on the outside heat exchanger. Can be delayed. As a result, it is possible to secure a longer time interval until the next defrosting operation is started, and it is possible to stably obtain the heating capacity of the container during the heating only operation.

In the vending machine according to the above aspect, preferably, the control unit, the elapsed time from the defrosting operation start, the elapsed time from the defrosting operation start and the temperature in the vicinity of the outside heat exchanger, and the defrosting operation start. Control for terminating the defrosting operation based on at least one of the temperature change near the outside heat exchanger and the predicted value of the temperature rise near the outside heat exchanger from the start of the defrosting operation. Is configured. According to this structure, the melting condition of the frost (ice) after the defrosting operation is started is obtained in advance by an experiment, or under the actual defrosting operation starting condition (low outside temperature condition). Based on the degree of melting of frost (ice) after the start of the defrosting operation, the frost (ice) in the outside heat exchanger can be melted in the optimum defrosting operation time. Therefore, the defrosting operation can be completed in the shortest possible time while surely melting the frost (ice), and the heating operation by the normal heat pump system can be quickly returned.

According to the present invention, as described above, the heating capacity of the storage can be stably obtained even in the heating operation system in which the outside heat exchanger is used to obtain atmospheric heat under the low outside temperature condition.

It is a perspective view showing the whole vending machine composition by one embodiment of the present invention. It is sectional drawing which showed the internal structure of the vending machine by one Embodiment of this invention. FIG. 1 is a refrigerant circuit diagram showing a schematic configuration of an automatic vending machine according to an embodiment of the present invention. FIG. 3 is a block diagram showing a control configuration of the vending machine according to the embodiment of the present invention. FIG. 4 is a refrigerant circuit diagram when performing HCC operation in the refrigerant circuit device shown in FIG. 3. FIG. 4 is a refrigerant circuit diagram in the case of performing a heating independent operation in the refrigerant circuit device shown in FIG. 3. FIG. 7 is a refrigerant circuit diagram in a case of performing a defrosting operation during the heating only operation shown in FIG. 6. It is the figure which showed an example of the process flow of the control part regarding the defrosting operation at the time of independent heating operation in the vending machine by one Embodiment of this invention.

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

[Embodiment]
A vending machine 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

(Overall structure of vending machines)
As shown in FIGS. 1 and 2, the vending machine 100 is a device that cools or heats a product 105 such as a canned beverage (plastic bottle beverage) and sells the product 105. The main body cabinet 1, the outer door 2, An inner door 3, a partition member 4, a product storage 5, a refrigerant circuit device 6, a machine room 7 for accommodating the refrigerant circuit device 6, and a controller 8 are provided. Further, as shown in FIG. 1, the product storage 5 includes a right storage 5a arranged on the X1 side, a middle storage 5b arranged in the center, and a left storage 5c arranged on the X2 side. The right compartment 5a and the middle compartment 5b are compartments exclusively for cooling, and the left compartment 5c is configured as a cooling/heating combined compartment capable of cooling and heating. Further, the right case 5a, the middle case 5b, and the left case 5c are separated from each other by a partition member 5d having a heat insulating property. Further, the main body cabinet 1 is vertically (separated by the arrow Z) separated by the partition member 4, so that the upper (Z1 side) product storage 5 and the lower (Z2 side) machine room 7 are partitioned from each other. There is.

As shown in FIG. 2, the left storage 5c (product storage 5) is provided with a product storage rack 5e. Although FIG. 2 shows the sectional structure of the product storage 5 at the left storage 5c, the right storage 5a and the middle storage 5b are also configured in substantially the same manner as the left storage 5c. Further, the product storage racks 5e individually arranged in each row forming the right storage 5a, the middle storage 5b, and the left storage 5c have a first portion 5f on the front side (Y1 side) and a rear side (Y2 side). It consists of a second portion 5g. Further, on the inner surface of the main body cabinet 1, a heat insulating material 9 is provided so as to surround the product storage rack 5e.

Each of the product storage racks 5e has a carry-out mechanism section 5h arranged near the lower end on the Z2 side and a carry-out shooter 10 for guiding the product 105 to the product take-out port 2a. Thereby, in the product storage 5, the horizontally placed products 105 are accommodated in a state of being stacked from the lower part (Z2 side) to the upper part (Z1 side), and the lower product 105 is sequentially passed through the carry-out shooter 10. It is configured to be discharged to the product outlet 2a. Further, the carry-out shooter 10 is provided with a plurality of through holes (not shown) through which cooling air or heated air flows along the thickness direction.

(Structure of Refrigerant Circuit Device)
As shown in FIG. 3, the refrigerant circuit device 6 includes a refrigerant circuit 60 including a main circuit 20, a high pressure refrigerant circuit 30, a heat dissipation circuit 40, and a bypass circuit 50. The main circuit 20 includes a compressor 21, a flow path switching valve 61, an outside heat exchanger 22, electronic expansion valves 23a to 23c, a right inside heat exchanger 24a, and an inside inside heat exchanger 24b. And a left inside heat exchanger 24c, and a refrigerant pipe 25 (a discharge pipe 25a (25b), a liquid pipe 25c, a suction pipe 25d, and pipes 25e and 25f) sequentially connecting these. In FIG. 3, for the sake of explanation of the CCC operation (cooling single operation) described later, the pipes 25e and 25f and the refrigerant return pipe 51 which are not used in this CCC operation are shown by broken lines for convenience. The left internal heat exchanger 24c is an example of the "internal internal heat exchanger" in the claims.

The discharge pipe 25a connects the compressor 21 and the flow path switching valve 61, and the discharge pipe 25b connects the flow path switching valve 61 and the outside heat exchanger 22. The liquid pipe 25c connected to the outlet of the outside heat exchanger 22 is connected to the electronic expansion valves 23a to 23c after branching into three systems at the branch portion P1. The suction pipe 25d connects the respective outlet sides of the right inside heat exchanger 24a, the inside inside heat exchanger 24b, and the left inside heat exchanger 24c to the compressor 21. The suction pipes 25d connected to the outlets of the internal heat exchangers (24a to 24c) are sequentially merged at the merging portion P2 and the merging portion P3 to form a single flow passage. ) Is connected to the suction side of the compressor 21. An electromagnetic valve 62 is provided in the suction pipe 25d extending from the outlet of the left inside heat exchanger 24c to the confluence portion P2. The solenoid valve 62 is in the open state when the "open command" is given from the control unit 8 (see FIG. 4) and allows the passage of the refrigerant, while it is in the closed state when the "close command" is given. Plays a role of regulating the passage of the refrigerant. The discharge pipes 25a and 25b are examples of the "bypass passage" in the claims.

The pipe 25e that constitutes the high-pressure refrigerant circuit 30 directly connects the flow path switching valve 61 and the portion of the refrigerant pipe 25 (downstream of the electronic expansion valve 23c) on the inlet side of the left internal heat exchanger 24c. .. Further, the pipe 25f forming the heat dissipation circuit 40 joins the branch portion P4 on the outlet side of the left inside heat exchanger 24c and the refrigerant pipe 25 (discharge pipe 25b) on the inlet side of the outside heat exchanger 22. It is connected to the section P5. Further, the discharge pipe 25a is provided with a coolant temperature sensor 81 for detecting the discharge coolant temperature Td. An outside air temperature sensor 82 for detecting the ambient temperature Ta is provided near the opening 7a on the front side (Y1 side) of the machine room 7 (on the back side of the outer door 2).

The compressor 21 in the main circuit 20 uses an inverter control type product in which the refrigerant discharge amount can be controlled based on the rotation speed control, and compresses and discharges the refrigerant (HFO-1234yf). Further, the outside heat exchanger 22 has a function of condensing the refrigerant by exchanging heat with the air (outside air) blown by the outside fan 71 when the high-temperature high-pressure refrigerant compressed by the compressor 21 passes through.

The electronic expansion valves 23a to 23c decompress the refrigerant for adiabatic expansion by finely controlling the valve opening degree, and at the same time, the right inside heat exchanger 24a, the inside inside heat exchanger 24b, and the left inside heat exchange. It has a role of controlling the flow rate of the refrigerant to the container 24c. A check valve 26 is provided between the electronic expansion valve 23c and the left internal heat exchanger 24c. The check valve 26 has a role of preventing the refrigerant flowing from the high pressure refrigerant circuit 30 described later to the left internal heat exchanger 24c from flowing backward to the electronic expansion valve 23c side. Further, the internal heat exchanger 24a is used for controlling the temperature of the right storage 5a, the internal heat exchanger 24b is used for controlling temperature of the middle storage 5b, and the left internal heat exchanger 24c is used for the left storage 5c. It is configured to be used for temperature control of each.

The flow path switching valve 61 sends the refrigerant discharged from the compressor 21 to the outside heat exchanger 22 in the direction of arrow A (see FIG. 3) through the discharge pipes 25a and 25b, and the pipe 25e. Is a solenoid valve (three-way valve) that switches between a second delivery state in which the heat is delivered to the left internal heat exchanger 24c in the direction of arrow B (see FIG. 5). The high pressure refrigerant circuit 30 is configured to be used in the second delivery state, and in the second delivery state, the left chamber 5c is heated by the refrigerant passing through the left inside heat exchanger 24c. It is configured.

Further, the heat dissipation circuit 40 includes a pipe 25f for circulating the refrigerant condensed in the left inside heat exchanger 24c, and an electronic expansion valve 41 for adiabatically expanding the refrigerant passing through the pipe 25f. Thus, the heat dissipation circuit 40 has a role of supplying the refrigerant condensed in the left inside heat exchanger 24c to the outside heat exchanger 22. In addition, the refrigerant after passing through the electronic expansion valve 41 is heat-exchanged with the air passing through the inside of the machine room 7 in the outside heat exchanger 22. A check valve 42 is provided between the electronic expansion valve 41 and the main circuit 20. The check valve 42 has a role of preventing the refrigerant flowing through the main circuit 20 from flowing backward toward the heat radiation circuit 40.

The bypass circuit 50 connects the downstream side of the outdoor heat exchanger 22 (the branch portion P6 in the middle of the refrigerant pipe 25) and the suction side of the compressor 21 (the joining portion P7 in the middle of the refrigerant pipe 25) to the refrigerant return. A pipe 51 and a solenoid valve 63 provided in the refrigerant return pipe 51 are provided. The solenoid valve 63 is in the open state when the "open command" is given from the control unit 8 (see FIG. 4) and allows passage of the refrigerant, while it is in the closed state when the "close command" is given. Plays a role of regulating the passage of the refrigerant. The refrigerant return pipe 51 is an example of the "refrigerant return passage" in the claims.

Further, the refrigerant circuit device 6 includes an outside fan 71 and internal fans 72a to 72c. Here, the compressor 21, the outside heat exchanger 22, and the outside fan 71 are installed in the machine room 7, and the outside fan 71 is a rear surface of the outside heat exchanger 22, as shown in FIG. It is provided on the side (Y2 side). The outside-compartment fan 71 has a role of circulating the air sucked from the front side (Y1 side) of the machine room 7 to the outside heat exchanger 22 and discharging the air from the back side (Y2 side) to the outside. The outside fan 71 is an example of the "blower unit for outside heat exchanger" in the claims.

The right inside heat exchanger 24a, the inside inside heat exchanger 24b, and the left inside heat exchanger 24c (see FIG. 3) are fin-and-tube type air heat exchangers in which the refrigerant flows inside the heat transfer tubes. , Right warehouse 5a, middle warehouse 5b, and left warehouse 5c are arranged on the rear side (Y2 side) of the inner bottom area. The internal fans 72a, 72b and 72c are arranged in front of the right internal heat exchanger 24a, the middle internal heat exchanger 24b and the left internal heat exchanger 24c (Y1 side).

As shown in FIG. 2, the product storage 5 is provided with back ducts 74a to 74c that are insulated from each other. The rear surface duct 74c corresponding to the left storage 5c extends in the up-down direction along the rear surface of the left storage 5c, and the lower end portion reaches the rear surface side (Y2 side) of the left internal heat exchanger 24c. Thereby, the air cooled/heated by the left inside heat exchanger 24c flows from the lower end of the left inside 5c to the front direction (arrow Y1 direction) by the inside fan 72c, and the plurality of through holes of the carry-out shooter 10 are provided. While passing through, it turns diagonally upward and is distributed. Then, after the product storage rack 5e in which the products 105 are stacked flows from the first portion 5f toward the rearward second portion 5g, the product storage rack 5e is collected in the rear duct 74c. Then, the air that has cooled/heated the product 105 is circulated again to the left inside heat exchanger 24c. The circulation direction of the air cooled by the right inside heat exchanger 24a and the inside inside heat exchanger 24b is also the same as that of the left inside 5c.

Further, inside temperature sensors 85a to 85c are provided at the lower ends of the first portions 5f (see FIG. 2) of the right case 5a, the middle case 5b, and the left case 5c, respectively. Further, as shown in FIG. 2, a wiring duct 5j through which an electric wiring is passed is provided at the lower end of each first portion 5f. In the left cabinet 5c, the interior temperature sensor 85c is provided inside the wiring duct 5j.

Further, heat exchange temperature sensors 86a to 86c are attached to the right inside heat exchanger 24a, the inside inside heat exchanger 24b, and the left inside heat exchanger 24c, respectively. Specifically, the heat exchange temperature sensors 86a to 86c are attached to heat transfer pipes (refrigerant pipes) that form the right inside heat exchanger 24a, the inside inside heat exchanger 24b, and the left inside heat exchanger 24c. There is. The heat exchange temperature sensors 86a to 86c are both electrically connected to the control unit 8 (see FIG. 4), and based on the temperature detected by the heat exchange temperature sensors 86a to 86c, the right inside heat exchanger 24a, middle The temperature of the inside heat exchanger 24b and the temperature of the left inside heat exchanger 24c are configured to be grasped by the control unit 8.

Further, as shown in FIG. 2, an auxiliary heater 73 for heating is provided in front of the left inside heat exchanger 24c (Y1 side). Thereby, under a predetermined operating condition, the air heated by the auxiliary heater 73 is introduced into the left storage 5c by the internal fan 72c.

As a control configuration of the vending machine 100, as shown in FIG. 4, a ROM 8a and a RAM 8b are provided in addition to the control unit 8 including a CPU. The ROM 8a stores a control program executed by the control unit 8 and a table (not shown) in which the operating frequency of the compressor 21 is defined. Further, the RAM 8b temporarily stores control parameters used when the control program is executed, the detected value of the outside air temperature (temporal change data), and the like. Further, the control unit 8 makes a predetermined determination based on input signals from the outside air temperature sensor 82, the inside temperature sensors 85a to 85c, etc., and appropriately operates the refrigerant circuit device 6 (see FIG. 3) based on the determination result. It is configured to perform control.

In the vending machine 100, an operation in which the right inside heat exchanger 24a, the inside inside heat exchanger 24b, and the left inside heat exchanger 24c are all used as evaporators to cool the right inside 5a, inside 5b, and left inside 5c In addition to the mode (CCC operation), by switching the refrigerant flow path in the refrigerant circuit device 6, the right inside heat exchanger 24a and the inside inside heat exchanger 24b serve as evaporators and the left inside heat exchanger The operation mode (HCC operation) in which 24c functions as a condenser to heat the left storage 5c is operable. Furthermore, by switching the refrigerant flow paths, the outside heat exchanger 22 serves as an evaporator and the left inside heat exchanger 24c functions as a condenser to operate only the left inside 5c (heating alone operation. ) Is configured to be operable. The refrigerant circuit device 6 configured as described above is configured to cool or heat (heat) the product 105 stored in the product storage 5 as follows.

(Explanation of CCC operation (cooling independent operation))
The CCC operation (cooling independent operation) of cooling the right warehouse 5a, the middle warehouse 5b, and the left warehouse 5c will be described. In the CCC operation, as shown in FIG. 3, the control unit 8 (see FIG. 4) switches the flow path switching valve 61 to the first delivery state (the state in which the refrigerant flows in the direction of arrow A), and the electronic expansion valve 41 and A "close command" is given to the solenoid valve 63. The control unit 8 also gives an "opening control command" to the electronic expansion valves 23a-23c and an "open command" to the solenoid valve 62.

As a result, the refrigerant from the compressor 21 flows through the discharge pipe 25a (25b) in the direction of arrow A, is heat-exchanged with the outside air in the outside heat exchanger 22, and is condensed. After flowing through the liquid pipe 25c and branched into three, the pressure is reduced by the electronic expansion valves 23a to 23c and adiabatically expanded. The adiabatic expansion refrigerant flows through each of the right inside heat exchanger 24a, the inside inside heat exchanger 24b, and the left inside heat exchanger 24c, and the insides of the right inside 5a, inside 5b, and left inside 5c. It evaporates due to heat exchange with air, and the air inside the refrigerator is cooled. As the cool air circulates in each of the right compartment 5a, the middle compartment 5b, and the left compartment 5c by the compartment fans 72a to 72c, the product 105 (see FIG. 2) is cooled by the circulating compartment air. The refrigerant evaporated in each of the right inside heat exchanger 24a, the middle inside heat exchanger 24b, and the left inside heat exchanger 24c merges and then is sucked into the compressor 21 via the suction pipe 25d.

(Explanation of HCC operation (heat pump heating operation using internal heat)
The HCC operation (heat pump heating operation of the internal heat utilization method) of heating the left warehouse 5c and cooling the right warehouse 5a and the middle warehouse 5b will be described. In the HCC operation, as shown in FIG. 5, the control unit 8 (see FIG. 4) switches the flow path switching valve 61 to the second delivery state (the state in which the refrigerant flows in the direction of arrow B), the solenoid valve 62, and the electromagnetic valve. A "close command" is given to each of the valve 63 and the electronic expansion valve 23c. Further, the control unit 8 gives an "open command" to the electronic expansion valve 41, and also gives an "opening control command" to the electronic expansion valves 23a and 23b.

As a result, the refrigerant from the compressor 21 flows through the discharge pipe 25a and the pipe 25e in the direction of arrow B and then flows into the left internal heat exchanger 24c. When the refrigerant flows through the left inside heat exchanger 24c, it condenses due to heat exchange with the inside air of the left inside 5c. Further, the air inside the left storage 5c is heated and circulated inside the left storage 5c by driving the internal fan 72c, so that the product 105 in the left storage 5c is heated. The refrigerant condensed in the left inside heat exchanger 24c flows through the electronic expansion valve 41 of the pipe 25f in the direction of arrow B and then flows into the outside heat exchanger 22. In the HCC operation, the electronic expansion valve 23c is closed. The liquid refrigerant that has flowed through the liquid pipe 25c and is branched into two branches flows through the electronic expansion valves 23a and 23b and is decompressed and adiabatically expanded. When the refrigerant flows through the right inside heat exchanger 24a and the inside inside heat exchanger 24b, the refrigerant evaporates by heat exchange with the inside air of the right inside 5a and inside inside 5b to cool the inside air. Cool air is circulated through the inside fans 72a and 72b in each of the right case 5a and the middle case 5b to cool the product 105. The refrigerant evaporated in the right inside heat exchanger 24a and the inside inside heat exchanger 24b merges, and then is sucked into the compressor 21 via the suction pipe 25d.

(Explanation of independent heating operation (heat pump heating operation using atmospheric heat))
In the vending machine 100, when the products 105 in the right storehouse 5a and the inside storehouse 5b reach a desired set temperature (cooling temperature) and the cooling of the right storehouse 5a and the inside storehouse 5b is stopped, the left storehouse to be heated. A single heating operation (heat pump heating operation) for heating only the product 105 of 5c to a desired set temperature (heating temperature) is performed. In the heating only operation, as shown in FIG. 6, the control unit 8 (see FIG. 4) switches the flow path switching valve 61 to the second delivery state (the state in which the refrigerant flows in the direction of arrow C) and the solenoid valve 62. And a "close command" is given to the electronic expansion valves 23a to 23c. Further, the control unit 8 gives an "opening control command" to the electronic expansion valve 41 and also gives an "opening command" to the solenoid valve 63.

As a result, the refrigerant from the compressor 21 flows through the discharge pipe 25a and the pipe 25e in the direction of arrow C to the left internal heat exchanger 24c, and is condensed by heat exchange with the air in the left internal storage 5c. .. The air in the left storage 5c is heated to heat the product 105. Further, the refrigerant condensed in the left inside heat exchanger 24c flows through the electronic expansion valve 41 of the pipe 25f in the direction of arrow C to be decompressed and adiabatically expanded. The refrigerant is evaporated by absorbing the heat of the outside air (atmospheric heat) when flowing through the outside heat exchanger 22. The evaporated refrigerant flows from the branch portion P6 through the refrigerant return pipe 51 toward the confluence portion P7, merges with the refrigerant pipe 25 (suction pipe 25d) at the confluence portion P7, and is sucked into the compressor 21. In the heating only operation, the refrigerant circulation that goes through the compressor 21, the discharge pipe 25a, the pipe 25e, the left inside heat exchanger 24c, the pipe 25f, the outside heat exchanger 22, the refrigerant return pipe 51, and the suction pipe 25d. The path 6a is formed in the refrigerant circuit device 6. The refrigerant circulation path 6a is an example of the "first flow path" in the claims.

Here, in the present embodiment, when the heating only operation is performed, the defrosting operation of melting (removing) the frost attached to the outside heat exchanger 22 serving as the evaporator is performed. Specifically, as shown in FIG. 7, when a predetermined defrosting operation start condition is satisfied, the control unit 8 (see FIG. 4) causes the flow path switching valve 61 to move to the first delivery state (refrigerant in the arrow D direction). (Flowing state) and a "close command" is given to the electronic expansion valve 41. Further, the "close command" of the electronic expansion valves 23a to 23c and the solenoid valve 62 is continued, and the "open command" of the solenoid valve 63 is also continued. As a result, in the refrigerant circuit device 6, a closed refrigerant circulation path 6b (shown by a thick solid line) that goes around the compressor 21, the discharge pipes 25a and 25b, the external heat exchanger 22, the refrigerant return pipe 51, and the suction pipe 25d. Is formed. The refrigerant circulation path 6b is an example of the "second flow path" in the claims.

In the defrosting operation, the high-temperature refrigerant (hot gas) compressed by the compressor 21 is passed through the outside heat exchanger 22 to remove frost (ice) attached to the fins (not shown) of the outside heat exchanger 22. It is configured to be melted by the heat of the high temperature refrigerant. When the defrosting operation is performed, the outside fan 71 is temporarily stopped. Note that this defrosting operation is performed when the outside air temperature (ambient temperature Ta) in which the vending machine 100 is installed by the outside air temperature sensor 82 becomes, for example, about -5°C or lower, and the outside air temperature condition is satisfied. It is configured to be executed when the heating independent operation is continued for a predetermined time (for example, 8 hours) below.

In addition, when a predetermined defrosting operation end condition is satisfied during execution of the defrosting operation, the control unit 8 switches the flow path switching valve 61 to the second delivery state (the state in which the refrigerant flows in the direction of arrow C). The "opening control command" is given to the electronic expansion valve 41. As a result, the defrosting operation is completed and the normal HCC operation or the heating independent operation is restored.

Next, referring to FIG. 2 to FIG. 8, when the vending machine 100 performs the heating only operation in the heat pump heating operation, the defrosting operation for removing the frost (ice) attached to the outside heat exchanger 22. A processing flow by the control unit 8 when the process is performed will be described. As a premise of this control processing flow, the flow path switching valve 61, the electromagnetic valve 62, the electronic expansion valves 23a to 23c, the electronic expansion valve 41, and the electromagnetic valve 63 in the refrigerant circuit device 6 (see FIG. 6) are operated in a heating independent operation. It is assumed that the operation state in which (see FIG. 6) is executed is preset.

As shown in FIG. 8, in step S1, the current ambient temperature Ta (outside air temperature) is acquired by the control unit 8 (see FIG. 4). That is, the current ambient temperature Ta is grasped by the control unit 8 side based on the detection result of the outside air temperature sensor 82 (see FIG. 4). Then, in step S2, the control unit 8 determines whether or not the environment is a low ambient temperature environment. That is, whether the ambient temperature Ta in which the vending machine 100 (see FIG. 2) is installed corresponds to a low ambient temperature environment based on the detection result of the outside air temperature sensor 82 (for example, whether it is -5° C. or lower). Is determined. If it is determined in step S2 that the environment does not correspond to the low ambient temperature environment, this control flow is temporarily terminated. In the case where the heating only operation is continuing, the main control flow shown in FIG. 8 is executed again after a predetermined control cycle has elapsed after the end of the main control flow.

When it is determined in step S2 that the ambient temperature Ta in which the vending machine 100 is installed corresponds to the low ambient temperature environment (a state of -5°C or lower), in step S3, it is determined whether or not the defrosting operation start condition is satisfied. The control unit 8 determines whether or not it is. The determination in step S3 is repeated until the defrosting operation start condition is satisfied.

When it is determined in step S3 that the defrosting operation start condition is satisfied, in step S4, the flow path switching valve 61 (see FIG. 7) is in the first delivery state (the state in which the refrigerant flows in the direction of arrow D) by the control unit 8. Can be switched to. In this embodiment, when it is determined that the heating single operation is continued for 8 hours under the low ambient temperature environment, it is determined that the defrosting operation start condition is satisfied. Then, in step S5, the control unit 8 continues the operation of the compressor 21 (see FIG. 7) and stops the rotation of the outdoor fan 71 (see FIG. 7).

As a result, the vending machine 100 (refrigerant circuit device 6) is operated in a defrosting operation mode in which hot gas is used to melt frost, as shown in FIG. 7. That is, in the refrigerant circuit device 6, the refrigerant circulation path 6b (thick, which is a small closed circuit that goes around the compressor 21, the discharge pipes 25a and 25b, the outside heat exchanger 22, the refrigerant return pipe 51, and the suction pipe 25d). (Indicated by the solid line) is formed. Therefore, the high-temperature refrigerant (hot gas) compressed by the compressor 21 is circulated (bypassed) to the outside heat exchanger 22 via the discharge pipes 25a and 25b, and the fins (not shown) of the outside heat exchanger 22 are shown. ) (Frost) adhering to () is melted by the heat of the hot gas.

After the start of the defrosting operation, as shown in FIG. 8, in step S6, the control unit 8 determines whether or not the defrosting operation ending condition is satisfied. The determination in step S6 is repeated until the defrosting operation end condition is satisfied. In the present embodiment, it is determined whether 5 minutes have elapsed since the defrosting operation was started. Therefore, during this 5 minutes, the high-temperature refrigerant (hot gas) from the compressor 21 continues to flow to the outside heat exchanger 22, and the frost (attached to the fins of the outside heat exchanger 22 over this 5 minutes ( Ice) is thawed. Since the external fan 71 is stopped, the heat of the hot gas is effectively transferred to the fins (not shown) of the heat exchanger 22.

When it is determined in step S6 that the defrosting operation end condition is satisfied (5 minutes have elapsed), in step S7, the external fan 71 (see FIG. 7) is restarted. Therefore, water drops flowing down the fins of the outside heat exchanger 22 and steam of water vaporized from the surfaces of the fins are blown off by the air supplied by the outside fan 71. At this time, as shown in FIG. 2, by controlling the rotation direction of the outside-compartment fan 71, outside air is sucked from the back side (Y2 side) of the machine room 7 and blown to the outside-compartment heat exchanger 22, and at the same time, the front side. The gas is exhausted from the opening 7a on the side (Y1 side). As a result, the air in the machine room 7, which has been warmed to some extent by the exhaust heat of the compressor 21 in operation, is blown to the outside heat exchanger 22 and the drying of the fin surface is effectively promoted.

Then, as shown in FIG. 8, when a predetermined time (for example, 30 seconds) elapses after restarting the external fan 71, the flow path switching valve 61 (see FIG. 7) is controlled by the controller 8 in step S8. It is switched to the two-delivery state (the state in which the refrigerant flows in the direction of arrow B). As a result, as shown in FIG. 7, the refrigerant circulation path 6b (shown by a thick solid line) is formed as the defrosting operation mode, and the refrigerant circulation path 6a shown in FIG. 6 is returned to the formed state. The vending machine 100 is returned to the heating independent operation (see FIG. 6). After the end of the control flow, the control flow shown in FIG. 8 is executed again after the lapse of a predetermined control cycle. In this way, the control regarding the defrosting operation during the heating only operation is performed.

Although not shown, when a cooling operation request or a heating operation request for using the internal heat is generated in the vending machine 100, the flow path switching valve 61, the solenoid valve 62, and the electromagnetic valve 62 that configure the refrigerant circuit device 6 are generated. 63 or the like is appropriately switched to start the cooling single operation (CCC operation: see FIG. 3) or the heat pump heating operation (HCC operation: see FIG. 5). The vending machine 100 in this embodiment is configured as described above.

(Effects of the embodiment)
In this embodiment, the following effects can be obtained.

In the present embodiment, as described above, the refrigerant discharged from the compressor 21 is passed through the refrigerant circulation path 6a for circulating the refrigerant in the left inside heat exchanger 24c and the outside heat exchanger 22 into the left inside heat exchanger. The refrigerant circulation path 6a is used by switching the refrigerant flow path to the refrigerant circulation path 6b that allows the high-temperature refrigerant (hot gas) from the compressor 21 to directly flow to the outside heat exchanger 22 without passing through 24c. A control unit 8 is provided for performing a defrosting operation in which the frost (ice) attached to the outside heat exchanger 22 is melted by using the refrigerant circulation path 6b during the single heating operation for heating the inside of the left cabinet 5c. Accordingly, in the operation method (heating only operation) in which the outside heat exchanger 22 functions as an evaporator to cause the refrigerant to absorb atmospheric heat and at the same time the left inside heat exchanger 24c radiates the heat to heat the inside of the left inside 5c. Also, the performance of the outside heat exchanger 22 can be maintained by performing the defrosting operation in which the frost (ice) attached to the outside heat exchanger 22 is melted by the high temperature refrigerant (hot gas). As a result, the heating capacity of the left storage 5c (the left internal heat exchanger 24c) can be stably obtained even in the heating operation method in which the outside heat exchanger 22 is used to obtain atmospheric heat under low outside temperature conditions. it can.

Further, in the present embodiment, discharge pipes 25a and 25b that directly connect the discharge side of the compressor 21 and the inlet side of the outside heat exchanger 22, the outlet side of the outside heat exchanger 22, and the compressor 21. The refrigerant circulation path 6b during the defrosting operation is constituted by the refrigerant return pipe 51 that is directly connected to the suction side of. As a result, a small closed circuit (comprising the discharge pipes 25a and 25b and the refrigerant return pipe 51) that continuously circulates high-temperature refrigerant (hot gas) between the compressor 21 and the outside heat exchanger 22 in a short time is small. Since the closed circuit) can be used during the defrosting operation, the frost (ice) attached to the outside heat exchanger 22 can be quickly melted. That is, since the defrosting operation time can be further shortened, it is possible to quickly return to the heating independent operation using the outside heat exchanger 22 as an evaporator. As a result, it is possible to prevent the temperature of the left cabinet 5c to be heated from fluctuating (decreasing) significantly due to the defrosting operation.

In addition, in the present embodiment, the control unit 8 is configured to perform the defrosting operation with the outside fan 71 stopped. As a result, the heat exchange between the outside heat exchanger 22 and the outside air can be stopped during the defrosting operation, so that the heat of the high-temperature refrigerant (hot gas) discharged from the compressor 21 is wasted to the outside air. Instead, it can be effectively (efficiently) transmitted to the outside heat exchanger 22. Therefore, frost (ice) attached to the outside heat exchanger 22 can be quickly melted.

In addition, in the present embodiment, the control unit 8 is configured to perform control for starting the defrosting operation based on the detection result of the outside air temperature of the environment in which the vending machine 100 is installed. As a result, the defrosting operation of the outside heat exchanger 22 can be executed after the defrosting operation start condition that actually requires the defrosting operation of the outside heat exchanger 22 is grasped. Therefore, since it is possible to defrost the outside heat exchanger 22 in the minimum necessary defrosting operation time (the number of defrosting operations), due to the frequent occurrence of the defrosting operation, It is possible to prevent the temperature of the left cabinet 5c to be heated from fluctuating (decreasing) significantly.

In addition, in the present embodiment, after the defrosting operation is finished, the stopped external fan 71 is started, and then the refrigerant flow path is switched from the refrigerant circulation path 6b to the refrigerant circulation path 6a to perform the heating only operation. The control unit 8 is configured to perform the control for returning. Thereby, the moisture (steam) of the frost (ice) melted by the defrosting operation is used from the outside heat exchanger 22 by using the air (outside air) supplied by the outside fan 71 before returning to the heating only operation. Can be reliably removed (blown away). That is, since the outside heat exchanger 22 can be brought into a dry state and then the heating independent operation in which the outside heat exchanger 22 functions as an evaporator can be restored, a new attachment to the outside heat exchanger 22 can be performed. The start time of frost can be delayed. As a result, it is possible to secure a longer time interval until the next defrosting operation is started, and it is possible to stably obtain the heating capacity of the left storage 5c (the left internal heat exchanger 24c) during the heating operation. it can.

In addition, in the present embodiment, the control unit 8 is configured to perform control for ending the defrosting operation of the outside heat exchanger 22 when 5 minutes have elapsed from the start of the defrosting operation. Thereby, the degree of melting of frost (ice) after the start of the defrosting operation is obtained in advance by an experiment or the like, and the frost of the outside heat exchanger 22 (at the optimum defrosting operation time is obtained based on the obtained experimental result). Ice) can be thawed. Therefore, the defrosting operation can be completed in the shortest possible time while surely melting the frost (ice), and the heating independent operation by the normal heat pump system can be quickly returned.

[Modification]
The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and further includes meanings equivalent to the scope of the claims and all modifications (modifications) within the scope.

For example, in the above-described embodiment, the control unit performs the defrosting operation of the outside heat exchanger 22 when the state where the outside air temperature is −5° C. or lower continues for a predetermined time (8 hours) during the heating only operation. However, the present invention is not limited to this. For example, as an index for starting the defrosting operation, in addition to the detection result of the outside air temperature, the temperature near the outside heat exchanger 22 (for example, the instantaneous value of the temperature of the fins) or the temperature near the outside heat exchanger 22 is displayed. It is more preferable that the control unit 8 is configured to determine whether or not to start the defrosting operation based on an acquisition result (such as an appropriate combination) such as a decreasing tendency (for example, a change in fin temperature over time). That is, the defrosting operation is performed after more accurately determining the degree of adhesion and growth of frost (ice) based on the temperature in the vicinity of the outside heat exchanger 22 and the decreasing tendency of the temperature in the vicinity of the outside heat exchanger 22. It is also possible to determine whether or not to start. In this case, a temperature sensor for detecting the temperature near the outside heat exchanger 22 may be provided near the outside heat exchanger 22. Alternatively, the determination as to whether or not to start the defrosting operation may be performed based on the temperature near the outside heat exchanger 22 or the temperature change tendency without using the detection result of the outside air temperature. Further, in the above embodiment, the interval between the defrosting operation and the next defrosting operation is set to 8 hours, but this interval may be other than 8 hours.

In addition, regarding whether or not to start the defrosting operation, from the same viewpoint, when frost (ice) adheres to and grows on the outside heat exchanger 22 in a low ambient temperature environment, the outside heat exchanger 22 Since the performance (evaporator performance) of (1) gradually decreases, the influence of frost also appears on the performance degradation of the left inside heat exchanger 24c (the reduction of the heating capacity of the left warehouse 5c). For example, the case where the temperature of the left storage 5c is not raised by 2° C. or more in 5 minutes, the case where the discharged refrigerant temperature Td by the refrigerant temperature sensor 81 is decreased to 50° C. or less, and the like correspond to this. Therefore, as an index for starting the defrosting operation, the defrosting operation is performed based on the acquisition results of the decreasing tendency (temporal change) of the temperature of the left internal heat exchanger 24c and the decreasing tendency of the temperature of the left warehouse 5c during the heating only operation. The control unit 8 may be configured to determine whether to start. In this case, the decreasing tendency of the temperature of the left inside heat exchanger 24c can be detected by the heat exchange temperature sensor 86c. The tendency of the temperature of the left cabinet 5c to decrease can be detected by the internal temperature sensor 85c.

Further, in the above-described embodiment, the control unit 8 is configured to end the defrosting operation of the outside heat exchanger 22 at the time when 5 minutes uniquely elapses from the start of the defrosting operation. Not limited. For example, as an index for ending the defrosting operation, in addition to the elapsed time of the defrosting operation, the temperature near the outside heat exchanger 22 (for example, when the instantaneous value of the temperature of the fins is 7° C. or more), The change tendency of the temperature near the heat exchanger 22 (for example, when the temperature of the fins rises by 2° C. or more in 3 seconds), or the predicted value of the temperature rise amount based on the temperature rise near the outside heat exchanger 22 Based on (combined appropriately), the control unit 8 may be configured to determine whether or not the defrosting operation is finished after accurately determining the degree of frost (ice) melting in the outside heat exchanger 22. Is. The method of predicting the amount of temperature increase near the outside heat exchanger 22 is predicted from the relationship between the discharged refrigerant temperature Td by the refrigerant temperature sensor 81 from the start of the defrosting operation and the ambient temperature Ta by the outside air temperature sensor 82. Good. For example, if it is determined that the temperature in the vicinity of the outside heat exchanger 22 becomes 7° C. or more 1 minute after the present, the defrosting operation using hot gas may be terminated (released) 1 minute after that. Good.

Moreover, although the said embodiment showed the example which defrosts the exterior heat exchanger 22 at the time of independent heating operation, this invention is not limited to this. For example, when the HCC operation (see FIG. 5) is performed so that the right warehouse 5a and the interior warehouse 5b are operated so as to have a desired cooling temperature, the right interior heat exchanger 24a and the interior interior heat exchanger 24b are connected to each other. Also, frost accumulates on the fins due to the water content of the cold air that cools the interior. When the right warehouse 5a and the interior warehouse 5b reach the desired cooling temperatures and the cooling of the right warehouse 5a and the interior warehouse 5b is stopped (thermo off), the heating is switched to the independent heating operation for heating only the left warehouse 5c. The external heat exchanger 22 may be operated as an evaporator. In such a case, the outside heat exchanger 22 is removed by hot gas in synchronization with the defrosting operation (natural thawing of frost) of the right inside heat exchanger 24a and the inside inside heat exchanger 24b whose cooling is stopped. You may perform frost operation.

Further, in the above-described embodiment, the vending machine 100 is configured such that the right storage 5a and the middle storage 5b are cooling-only storages, and the left storage 5c is a cooling/heating storage, but the present invention is not limited to this. For example, the vending machine may be configured such that only the right warehouse 5a is dedicated to cooling, and the middle warehouse 5b and the left warehouse 5c are both cooling/heating warehouses. Further, although the vending machine 100 is configured by the three warehouses of the right warehouse 5a, the middle warehouse 5b, and the left warehouse 5c, as long as the vending machine that uses the outside heat exchanger 22 as an evaporator and is capable of independent heating operation, The number of product storage boxes 5 may be other than three (three).

Further, in the above embodiment, an example in which the present invention is applied to the vending machine 100 that sells products 105 such as canned drinks and PET bottled drinks has been described, but the present invention is not limited to this. That is, if the vending machine 100 sells as a product 105 in which food and drink are enclosed in a container, the vending machine that sells products in which food and drink made of solid matter is enclosed in a container is not limited to liquid beverages. The present invention may be applied to the heating alone operation in.

Further, in the above-described embodiment, HFO-1234yf having a small global warming potential is used as the refrigerant, but the present invention is not limited to this. For example, the refrigerant circuit device 6 may be configured by using a carbon dioxide (CO ₂ ) refrigerant or another natural refrigerant.

Further, in the above-described embodiment, for convenience of description, the processing of the control unit 8 regarding the defrosting operation is described using the “flow drive type” flowchart, but the present invention is not limited to this. The process of the control unit 8 may be performed by an “event driven type” in which the process is performed in event units. In this case, the event driving may be performed completely, or the event driving and the flow driving may be combined.

5c Left warehouse (house)
6a Refrigerant circulation path (first flow path)
6b Refrigerant circulation path (second flow path)
8 Control Part 21 Compressor 22 Outside Heat Exchanger 24c Left Inside Heat Exchanger (Inside Heat Exchanger)
25a, 25b Discharge pipe (bypass flow path)
51 Refrigerant return pipe (refrigerant return flow path)
61 flow path switching valve 63 solenoid valve 71 outside fan (blower part for outside heat exchanger)
81 Refrigerant temperature sensor 82 Outside air temperature sensor 100 Vending machine

Claims (5)

A compressor for compressing the refrigerant,
An internal heat exchanger that heats the inside of the storage by condensation heat when condensing the high-temperature refrigerant discharged from the compressor,
An outside heat exchanger that evaporates the refrigerant that is condensed and adiabatically expanded by the inside heat exchanger,
The high-temperature refrigerant discharged from the compressor is compressed from the first flow path through which the high-temperature refrigerant is passed through the internal heat exchanger and the external heat exchanger in this order without passing the high-temperature refrigerant through the internal heat exchanger. Outside the heat exchanger during a heating independent operation of heating the inside of the storage using the first flow path by switching the refrigerant flow path from the machine to the second flow path that circulates to the outside heat exchanger. The frost attached to the container is melted using the second flow path, and the refrigerant discharged from the outside heat exchanger is passed through the inside heat exchanger to the compressor. And a control unit that performs a cooling independent operation to be distributed to
The second flow path is a bypass flow path that directly connects the discharge side of the compressor and the inlet side of the outside heat exchanger, the outlet side of the outside heat exchanger and the suction side of the compressor. Including a refrigerant return flow path that directly connects the side,
The bypass flow path is configured such that the high-temperature refrigerant flows during the cooling only operation and the defrosting operation,
Before SL coolant-returning flow path, the refrigerant discharged from the outside-compartment heat exchanger in heat isolated operation and during the defrosting operation is configured to flow, vending machine. Further comprising a blower for the outside heat exchanger that supplies outside air to the outside heat exchanger,
The vending machine according to claim 1, wherein the control unit is configured to perform the defrosting operation in a state in which the outdoor heat exchanger blower unit is stopped. The control unit controls the start of the defrosting operation based on the temperature of at least one of the outside air temperature, the temperature of the outside heat exchanger, and the temperature of the inside heat exchanger, or the temperature change tendency. The vending machine of claim 1 or 2, configured to do so. The control unit switches the refrigerant flow passage from the second flow passage to the first flow passage after starting the stopped external heat exchanger blower immediately before the defrosting operation is finished. The vending machine according to claim 2, wherein the automatic vending machine is configured to perform control for returning to the heating independent operation. The control unit, the elapsed time from the defrosting operation start, the elapsed time from the defrosting operation start and the temperature in the vicinity of the outside heat exchanger, and the temperature in the vicinity of the outside heat exchanger from the start of the defrosting operation Based on at least one of a change tendency and a predicted value of a temperature rise in the vicinity of the outside heat exchanger from the start of the defrosting operation, the control for ending the defrosting operation is performed, Item 5. The vending machine according to any one of Items 1 to 4.

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