JP5347704B2 - vending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vending machine which is provided with a cooling/heating system and prevents leakage in a check valve. <P>SOLUTION: The vending machine is provided with a capillary tube 19 which decompresses a refrigerant at the time of a cooling operation, capillary tubes 20 and 21 which decompress the refrigerant at the time of a heating operation, a check valve 17 which makes the refrigerant pass only at the time of the cooling operation, and a check valve 18 making the refrigerant pass only at the time of the heating operation. Since a refrigerant flow rate on this side of the check valve 18 at the time of the cooling operation can be speeded up by arranging the check valve 18 between the capillary tube 20 and the capillary tube 21, the check valve is easily closed and leakage can be prevented in the vending machine. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cooling and heating system that performs cooling and heating using latent heat generated when refrigerant compressed by a compressor condenses in a vending machine that sells canned beverages by cooling and heating the same Is related to vending machines using

In recent years, there has been an increasing demand for power consumption reduction for vending machines, and as a means for reducing power consumption, a system using a system for heating with a heat pump has been proposed. (See Patent Document 1)
FIG. 5 shows a refrigerant circuit diagram of the vending machine shown in Patent Document 1. As shown in FIG.

  As shown in FIG. 5, the conventional vending machine includes a cooling box 37 that cools the goods to be stored, and cooling and heating boxes 38 and 39 that cool or heat the goods to be stored. A machine room is provided which is divided and formed in a vertical direction by a partition wall. The conventional vending machine has a first compressor 53 and a first heat exchanger 54 (external heat exchanger) arranged in a machine room connected in an annular manner with an indoor heat exchanger 50 arranged in a cooling and heating cabinet 39. And a cooling / heating cycle including a flow path switching valve 55 for switching the flow path of the refrigerant, an evaporator 47 disposed in the cooling chamber 37, and an evaporator 48 disposed in the cooling / heating chamber 38. It is comprised by the cooling cycle comprised by the three-way valve 58 which switches the flow path of the refrigerant | coolant to the 2nd compressor 56, the condenser 57, and the evaporators 47 and 48 which are arrange | positioned in the machine room.

  The flow path switching valve 55 is composed of four switching valves. When the cooling and heating chamber 39 is cooled, the flow path switching valve 55 includes a high pressure side cooling switching valve 55a and a low pressure side cooling switching valve 55b that are opened as refrigerant flow paths. And a high-pressure side warming switching valve 55c and a low-pressure side warming switching valve 55d that are opened as a refrigerant flow path when the cooling and warming chamber 39 is warmed.

  Further, between the flow path switching valve 55 and the indoor heat exchanger 50, the dryer 100 and the second pipe 100 are connected to the piping path through which the refrigerant flows only when the cooling and heating chamber 39 is cooled by the operation of the flow path switching valve 55 a. 1 is connected to the first check valve 101 and the first liquid pipe (first capillary tube) 59, and the piping path through which the refrigerant flows only when the cooling and heating chamber 39 is heated by the operation of the flow path switching valve 55c. A second liquid pipe (second capillary tube) 60 and a second check valve 102 are connected.

  When the cooling and heating chamber 39 is cooled, the refrigerant flows from the indoor heat exchanger 50 acting as an evaporator in the direction of the flow path switching valve 55b and returns to the first compressor 53, and is discharged from the first compressor 53 during heating. The refrigerant passes through the flow path switching valve 55c and flows in the direction of the indoor heat exchanger 50 acting as a condenser, and the gas pipe 61 (which connects the flow path switching valves 55b and 55c and the indoor heat exchanger 50) Connection piping) is configured.

  FIG. 6 is a perspective view showing a principal part of the connection configuration of the cooling and heating system of the vending machine shown in Patent Document 1 and the piping configuration of the first capillary tube and the second capillary tube.

As shown in FIG. 6, the connection pipe 61 and the first capillary tube 59 are closely fixed with solder or the like between the flow path switching valve 55 and the indoor heat exchanger 50, and the periphery is urethane foam. It surrounds with the heat insulation members 62, such as. Further, the second capillary tube 60 is not fixed in contact with the connection pipe 61 or the first capillary tube 59, and is insulated by the heat insulating member 62 so as not to exchange heat with the connection pipe 61, and is insulated by the banding tube 63 or the like. It is configured to be fixed to the outside of the member 62.

  The operation of the vending machine configured as described above will be described below.

  First, when the cooling / heating chamber 39 is cooled, the cooling / heating chamber 39 is in a state where the high-pressure side cooling switching valve 55a and the low-pressure side cooling switching valve 55b are opened and the other switching valves 55c and 55d are closed. The first heat exchanger 54 functions as a condenser, and the indoor heat exchanger 50 functions as an evaporator, and is formed as a refrigerator 39. The refrigerant is compressed by the compressor to become a high-temperature and high-pressure gas, is liquefied by the first heat exchanger 54 through the switching valve 55a, passes through the first capillary tube 59 in which a flow path is secured by the operation of the switching valve 55b, and is decompressed. While flowing, it flows to the indoor heat exchanger 50, where it evaporates by absorbing heat from the inside of the refrigerator 39, communicates with the gas pipe 61, and returns to the compressor via the switching valve 55b.

  Next, when the cooling / warming chamber 39 is set to the warming chamber 39, that is, the cooling / warming chamber 39 has the high pressure side warming switching valve 55c and the low pressure side warming switching valve 55d opened, and the other switching valves. The first heat exchanger 54 functions as an evaporator and the indoor heat exchanger 50 functions as a condenser in a state in which 55a and 55b are closed, and the heating chamber 39 is formed. The refrigerant is compressed by the compressor 53 to become a high-temperature and high-pressure gas, passes through the connection pipe 61 through the switching valve 55c, flows into the indoor heat exchanger 50, and is liquefied by the heat radiation to the heating chamber 39. It passes through the second capillary tube 60 in which a flow path is secured by operation, flows to the first heat exchanger 54 while being decompressed, and evaporates by absorbing heat from the outside air, and returns to the compressor.

  First, when the cooling / heating chamber 39 is cooled, since the high temperature first capillary tube 59 and the low temperature connection pipe 61 are in close contact with each other, the first capillary tube 59 is cooled by the connection pipe 61 and the first capillary tube 59 is cooled. The refrigerant that has become liquid refrigerant due to the condensing action of the heat exchanger 54 further becomes supercooled liquid through the connection pipe 61 and flows to the indoor heat exchanger 50, so that the efficiency during cooling can be improved.

  Further, when the cooling / heating chamber 39 is heated, the high-temperature connection pipe 61 and the low-temperature second capillary tube 60 are insulated from each other by the heat insulating member 62, so that heat from the connection pipe 61 to the second capillary tube 60 is obtained. Since there is no movement and heat is suppressed by the heat insulating member 62 so as not to lower the temperature of the refrigerant gas discharged from the first compressor 53, the heat is conveyed to the indoor heat exchanger 50, so that the heating efficiency of the heating chamber 39 is increased. be able to.

  Further, another heat insulating material is wrapped around the second capillary tube 60 itself, and is fixed to the outside of the heat insulating member 62 by the banding tube 63, so that the heat exchange between the second capillary tube 60 and the connection pipe 61 can be further performed. In addition, it is possible to prevent the piping surface of the second capillary tube 60 from being damaged. Moreover, you may cover with the coating layer which prevents damage other than a heat insulation member.

JP 2008-282124 A

However, in the above conventional configuration, the capillary tube is arranged on the internal heat exchanger side, and the check valve is arranged on the external heat exchanger side. The state of the refrigerant before the second check valve through which the gas passes becomes the liquid refrigerant. By becoming a liquid refrigerant, the flow rate of the refrigerant becomes slow, and therefore, the check valve is difficult to close, and the refrigerant may easily leak. As the refrigerant leaks, the amount of refrigerant circulation increases and the evaporation temperature increases. As a result, there was a problem of inducing a slow cooling phenomenon.

  In order to solve the above-described conventional problems, the vending machine of the present invention includes an internal heat exchanger disposed in a warehouse, a compressor in a machine room disposed below the interior, and external heat exchange. Automatic cooling or heating of the product put in the warehouse by switching the refrigerant flow path of the cooling and heating system that connects the vessel, the flow path switching valve for switching the flow path and the capillary tube in an annular shape In the vending machine, the capillary tubes are connected in parallel, and one connected piping path is provided with a cooling capillary tube that depressurizes the refrigerant during cooling and a first check valve that allows the refrigerant to pass only during cooling. The other path is provided with a heating capillary tube for reducing the pressure of the refrigerant at the time of heating and a second check valve for allowing the refrigerant to pass only at the time of the heating, and the heating capillary tube is provided with the second check valve. Upstream of By disposing divided into flow, by vacuum in front of the second check valve suppresses the liquid refrigerant state, it is possible to ensure the operation of the second check valve.

  The vending machine of the present invention can ensure the operation of the second check valve and prevent refrigerant leakage at the check valve portion in the cooling and heating system.

Refrigerant circuit diagram of vending machine in Embodiment 1 of the present invention System operation | movement figure at the time of performing the heating operation in Embodiment 1 of this invention System operation diagram when performing cooling operation in Embodiment 1 of the present invention Refrigerant circuit diagram of vending machine in Embodiment 2 of the present invention Refrigerant circuit diagram for conventional vending machines Perspective view of main parts showing connection piping in a conventional vending machine

  According to the first aspect of the present invention, an internal heat exchanger disposed in a warehouse, a compressor of a machine room disposed below the interior of the warehouse, an external heat exchanger, and a flow path for switching the flow path. In the vending machine that cools or heats the product put in the warehouse by switching the refrigerant flow path of the cooling and heating system that connects the switching valve and the capillary tube in an annular shape, the capillary tubes are arranged in parallel. One connected piping path is provided with a cooling capillary tube that depressurizes the refrigerant during cooling and a first check valve that allows the refrigerant to pass only during cooling, and the other connected path is used during heating. A heating capillary tube for reducing the pressure of the refrigerant and a second check valve for allowing the refrigerant to pass only during the heating are provided, and the heating capillary tube is divided and arranged upstream and downstream of the second check valve. What The liquid refrigerant state can be suppressed by reducing the pressure before the second check valve, and the operation of the second check valve can be ensured, and the refrigerant leakage at the check valve portion in the cooling and heating system can be prevented. Can be prevented.

  The invention according to claim 2 is the invention according to claim 1, wherein the resistance of the heating capillary tube provided on the downstream side of the second check valve is made larger than the resistance of the capillary tube provided on the upstream side. Therefore, the refrigerant can be depressurized more before the check valve on the side where no refrigerant is allowed to pass, so that the dryness of the refrigerant increases, so that the refrigerant flow rate is further increased and the check valve is more easily closed.

The invention according to claim 3 is the invention according to claim 1 or 2, further comprising an external fan for exchanging heat in the external heat exchanger of the cooling and heating system, and cooling operation in the cooling and heating system. When the compressor of the cooling and heating system is started, the external fan is stopped for a predetermined time after the start of the compressor. When the compressor is started, the heat exchange amount in the external heat exchanger is Since it decreases, the dryness of the refrigerant at the outlet of the external heat exchanger increases, the refrigerant flow rate becomes faster, and the check valve becomes easier to close.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, further comprising an internal fan that performs heat exchange in the internal heat exchanger of the cooling and heating system, wherein the cooling heating is performed. When performing the warming operation in the temperature system, the internal fan is stopped for a predetermined time after the compressor of the cooling warming system is started, and when performing the warming operation in the cooling warming system By reducing the amount of heat exchange in the internal heat exchanger, the degree of dryness of the refrigerant at the internal heat exchanger outlet increases, so that the refrigerant flow rate becomes faster and the check valve becomes easier to close.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but detailed description thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a refrigerant circuit diagram according to the first embodiment, FIG. 2 is a system operation diagram of a cooling and heating system during a heating operation, and FIG. 3 is a system operation diagram of the cooling and heating system during a cooling operation.

  In FIG. 1, the vending machine according to the present embodiment has a product storage 1 and a machine room (not shown) disposed in the lower part of the product storage 1. The inside of the product storage 1 is partitioned into three chambers by partition walls 2 and 3 filled with a heat insulating material, and between the cooling wall 4 and the partition walls 2 and 3 for cooling the product stored on the left side of the partition wall 2. A cooling / heating chamber 5 that cools or heats the products to be stored, and a cooling / heating chamber 6 that cools or heats the products to be stored that are positioned on the right side of the partition wall 3 In addition, a product storage shelf (not shown) is suspended in the upper part of the product storage 1 in each store, and the product is stored inside. Further, an evaporator 12 is provided below the cooling chamber 4, an electric heater 28 that is energized with the evaporator 13 is provided below the cooling and heating chamber 5, and an internal heat exchanger 22 is provided below the cooling and heating chamber 6. An electric heater 29 is provided as an auxiliary to the internal heat exchanger. The cooling cabinet 4 and the cooling and heating cabinets 5 and 6 have internal fans 25, 26, and 27, respectively, forcibly blowing air to circulate the internal air.

  Further, the vending machine according to the present embodiment includes a first compressor 7, a condenser 8, an evaporator 12, a three-way valve 9 for switching the flow path of the evaporator 13 and the refrigerant, and capillary tubes 10 and 11 which are decompression mechanisms. A cooling system 30 for cooling the cooling chamber 4, the cooling / heating chamber 5, the second compressor 14, the external heat exchanger 15, the internal heat exchanger 22, and the four-way valve 23 for switching the refrigerant flow path, A dryer 16, check valves 17 and 18, and a cooling and heating system 31 including capillary tubes 19, 20, and 21 that decompress the refrigerant passing therethrough are provided.

  Here, the discharge pipe, the suction pipe and the external heat exchanger 15 and the internal heat exchanger 22 of the second compressor 14 are connected to the four-way valve 23, and the discharge pipe of the second compressor, Switching between the cooling operation and the heating operation by switching the heat exchanger outside and inside the chamber communicating with the suction pipe.

  Further, a dryer 16, a first check valve 17 and a cooling capillary tube 19 are connected to a piping path through which the refrigerant passes when the cooling / heating chamber 6 is cooled, and the cooling / heating chamber 6 is heated. A second check valve 18, a heating first capillary tube 20 on the upstream side of the second check valve 18, and a heating second capillary tube 21 on the downstream side. Is connected. The first check valve 17 is connected in the direction in which the refrigerant flows from the external heat exchanger 15 side to the internal heat exchanger 22 side, and the second check valve 18 is connected to the internal heat exchanger 22 side. To the external heat exchanger 15 side in the direction in which the refrigerant flows.

The resistance of the second heating capillary tube 21 on the downstream side of the second check valve is set larger than the resistance of the first heating capillary tube 20 on the upstream side.

  Further, an outside fan 24 for promoting heat exchange is provided in the vicinity of the condenser 8 and the outside heat exchanger 15.

  The operation and action of the vending machine configured as described above will be described below.

  First, when the cooling / heating chamber 6 is heated, the discharge pipe of the second compressor 14 and the internal heat exchanger 22 communicate with each other, and the external heat exchanger 15 and the intake pipe of the second compressor 14 are communicated. The four-way valve 23 is operated so as to communicate with each other. By doing so, the refrigerant discharged from the second compressor 14 passes through the four-way valve 23 toward the internal heat exchanger 22 and is condensed and liquefied. The condensed liquid refrigerant is depressurized by the first heating capillary tube 20, passes through the second check valve 18, and further depressurized by the second heating capillary tube 21, and then the external heat exchanger 15. To evaporate and pass through the four-way valve 23 to return to the second compressor 14.

  At that time, the refrigerant is dried by the cooling capillary tube 19 in front of the first check valve 17 through which the refrigerant does not pass, so that the dryness of the refrigerant is increased. 17 becomes easy to close and it becomes difficult for a refrigerant | coolant to leak.

  In addition, at that time, as shown in FIG. 2, the amount of heat exchange in the internal heat exchanger 22 is reduced by stopping the internal fan 27 for a predetermined time after the second compressor 14 is activated. Furthermore, since the dryness of the refrigerant increases, the refrigerant flow rate becomes faster and the first check valve 17 is more difficult to leak.

  Next, when cooling the cooling chamber 6, the discharge pipe of the second compressor 14 and the external heat exchanger 15 communicate with each other, and the internal heat exchanger 22 and the intake pipe of the second compressor 14 are connected to each other. The four-way valve 23 is operated so as to communicate with each other. By doing so, the refrigerant discharged from the second compressor 14 passes through the four-way valve 23 toward the external heat exchanger 15 and is condensed and liquefied. The condensed liquid refrigerant passes through the dryer 16 and the first check valve 17 and is then depressurized by the cooling capillary tube 19 and supplied to the internal heat exchanger 22 to evaporate and pass through the four-way valve 23. To the second compressor 14.

  At that time, the refrigerant is depressurized by the heating second capillary tube 21 in front of the second check valve 18 through which the refrigerant does not pass, thereby increasing the dryness of the refrigerant in front of the second check valve 18. As a result, the refrigerant flow rate becomes faster, the second check valve 18 becomes easier to close, and the refrigerant is less likely to leak.

  Further, when the first capillary tube for heating 20 and the second capillary tube for heating 21 are divided and arranged before and after the second check valve 18, only one of the capillary tubes for heating is used. Compared to the above, the refrigerant can be decompressed immediately after passing through the internal heat exchanger 22 without arranging the second check valve 18 in the cooling / heating chamber 6 during the heating operation, so the amount of refrigerant is reduced. It is possible to improve the safety when the refrigerant leaks when the flammable refrigerant is used.

  Further, at that time, as shown in FIG. 3, by stopping the outside fan 24 for a predetermined time after the second compressor 14 is activated, the heat exchange amount in the outside heat exchanger 15 is reduced, Furthermore, since the dryness of the refrigerant increases, the refrigerant flow rate becomes faster, and leakage at the second check valve 18 can be prevented.

  Further, since the resistance of the second heating capillary tube 21 on the downstream side of the second check valve is set larger than the resistance of the first heating capillary tube 20 on the upstream side, the second check valve The dryness of the refrigerant before 18 becomes higher, and the second check valve 18 becomes easier to close.

(Embodiment 2)
FIG. 4 shows a refrigerant circuit diagram according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected about the structure same as embodiment described previously, and the detailed description is abbreviate | omitted.

  4, the vending machine according to the present embodiment includes a first compressor 7, a condenser 8, an evaporator 12, a three-way valve 9 for switching the flow path of the evaporator 13 and the refrigerant, and a capillary tube 10 serving as a pressure reducing mechanism. , 11, a cooling system 30 for cooling the cooling / heating chamber 5, a second compressor 14, an external heat exchanger 15, an internal heat exchanger 22, and a solenoid valve for switching the refrigerant flow path. 32, dryer 16, check valves 17 and 18, cooling capillary tube 19 for reducing the pressure of the refrigerant passing through, and cooling and heating system 34 including first heating capillary tube 33a and second heating capillary tube 33b. Is provided.

  Here, the electromagnetic valve 32 that switches the refrigerant flow path of the cooling and heating system 34 is connected to the electromagnetic valves 32 a and 32 b that switch the flow path from the discharge pipe of the second compressor 14 and the suction pipe of the second compressor 14. And solenoid valves 32c and 32d for switching the flow paths.

  In addition, a dryer 16, a first check valve 17 and a cooling capillary tube 19 are connected to a piping path through which the refrigerant passes when the cooling / heating chamber 6 is cooled, and when the cooling / heating chamber 6 is heated. A heating first capillary tube 33a and a heating second capillary tube 33b are connected to the piping path through which the refrigerant passes by being divided into an upstream side and a downstream side of the second check valve 18. The stop valve 17 is connected in the direction in which the refrigerant flows from the external heat exchanger 15 side to the internal heat exchanger 22 side, and the second check valve 18 is external heat exchange from the internal heat exchanger 22 side. It is connected in the direction in which the refrigerant flows to the container 15 side.

  The downstream connection pipe of the second check valve 18 is connected so as to communicate with the pipe connecting the electromagnetic valve 32 a and the external heat exchanger 15.

  About the vending machine comprised as mentioned above, the operation | movement and an effect | action below are demonstrated.

  First, when heating the cooling and heating chamber 6, the electromagnetic valves 32b and 32d are opened, and the electromagnetic valves 32a and 32c are closed. By doing so, the refrigerant discharged from the second compressor 14 passes through the electromagnetic valve 32b and then condenses and liquefies toward the internal heat exchanger 22. The condensed liquid refrigerant is depressurized by the first heating capillary tube 33a, then passes through the second check valve 18, and further depressurized by the second heating capillary tube 33b. To evaporate and then pass through the solenoid valve 32d to return to the second compressor 14.

  At that time, the refrigerant is dried by the cooling capillary tube 19 in front of the first check valve 17 through which the refrigerant does not pass, so that the dryness of the refrigerant is increased. 17 becomes easy to close and it becomes difficult for a refrigerant | coolant to leak.

  Next, when cooling the cooling / heating chamber 6, the electromagnetic valves 32a and 32c are opened, and the electromagnetic valves 32b and 32d are closed. By doing so, the refrigerant discharged from the second compressor 14 is condensed and liquefied in the external heat exchanger 15 after passing through the electromagnetic valve 32a. The condensed liquid refrigerant passes through the dryer 16 and the first check valve 17 and is then depressurized by the cooling capillary tube 19 and supplied to the internal heat exchanger 22 to evaporate, and then passes through the electromagnetic valve 32c. Then, it is refluxed to the second compressor 14.

At that time, the downstream connection pipe of the second check valve 18 is connected so as to communicate with the pipe connecting the electromagnetic valve 32 a and the external heat exchanger 15, and therefore downstream of the second check valve 18. The side is in a gaseous state, like the entrance of the external heat exchanger 15, and since the refrigerant flow rate is fast, the valve of the second check valve 18 is easy to close and the refrigerant is difficult to leak. Furthermore, even if the second check valve 18 cannot be closed due to a failure or a foreign object, the refrigerant is in a gas state, so that the passage resistance in the heating capillary tubes 33a and 33b is in a liquid state. Since the amount of refrigerant passing through the capillary tubes 33a and 33b decreases, the influence can be minimized.

  Of the heating capillary tubes 33a and 33b in the present embodiment, the heating second capillary tube 33b disposed on the downstream side of the second check valve 18 may be omitted. In this case, the state of the refrigerant on the downstream side of the second check valve 18 during the cooling operation communicates with the pipe connecting the electromagnetic valve 32a and the external heat exchanger 15, and therefore is in a gas state. Is due to. Thereby, cost reduction can be achieved.

  As described above, since the vending machine according to the present invention can prevent leakage of refrigerant in the check valve when using the heat pump, a cooling / heating device having a cold temperature switching system including the check valve can be used. It can also be applied to applications.

6 Cooling and heating chamber 14 Second compressor 15 External heat exchanger 17 First check valve 18 Second check valve 19 Capillary tube for cooling 20 First capillary tube for heating 21 Second capillary tube for heating 22 Internal heat exchanger 23 Flow path switching valve 24 External fan 27 Internal fan 32a, 32b, 32c, 32d Electromagnetic valve 33a Heating first capillary tube 33b Heating second capillary tube

Claims (4)

An annular heat exchanger disposed inside the chamber, a compressor of the machine room disposed below the interior of the chamber, an external heat exchanger, a flow path switching valve for switching the flow path, and a capillary tube In the vending machine that cools or warms the product put in the warehouse by switching the refrigerant flow path of the cooling and heating system connected to the capillary tube, the capillary tubes are connected in parallel, and one connected pipe The path is provided with a cooling capillary tube that depressurizes the refrigerant during cooling and a first check valve that allows the refrigerant to pass only during cooling, and the other connected path is a heating capillary tube that depressurizes the refrigerant during heating. And a second check valve that allows the refrigerant to pass only during heating, and the heating capillary tube is divided and arranged upstream and downstream of the second check valve. . The vending machine according to claim 1, wherein the resistance of the heating capillary tube provided on the downstream side of the second check valve is made larger than the resistance of the capillary tube provided on the upstream side. When the cooling / heating system is provided with an external fan that performs heat exchange with the external heat exchanger of the cooling / heating system, and a cooling operation is performed in the cooling / heating system, a predetermined time has elapsed since the compressor of the cooling / heating system was started. The vending machine according to claim 1 or 2, wherein the outside fan is stopped. A cooling fan is provided with an internal fan that performs heat exchange in the internal heat exchanger of the cooling and heating system, and when performing a heating operation in the cooling and heating system, the compressor of the cooling and heating system is started after being started. The vending machine according to any one of claims 1 to 3, wherein the internal fan is stopped for a time.