JP2002260081A - Cooling device of vending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device of vending machine capable of efficiently and simultaneously cooling a plurality of commodity storehouses in a well- balanced state. SOLUTION: This cooling device 1 of the vending machine is provided with a series cooling circuit for supplying a coolant shot from a compressor 11 to a first evaporator 16a and a second evaporator 16b in this order, a by-pass cooling circuit for supplying a coolant shot from the compressor 11 to the second evaporator 16b, evaporator temperature sensors 24a, 24b for detecting the temperature in the evaporators 16a, 16b, storehouse temperature sensors 21a, 21b for detecting the temperature in the commodity storehouses 19, 20, and a control device 22 for switching a supply circuit of the coolant shot from the compressor 11 when the detecting temperatures of the evaporator temperature sensors 24a, 24b reach the preset temperature. The preset temperature is varied according to the temperature in the commodity storehouses 19, 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a vending machine having a plurality of product storages for storing products and cooling and selling the products stored in the product storages.

[0002]

2. Description of the Related Art Conventionally, as a cooling device mounted on such a vending machine 2, the one shown in FIG. 6 has been known.
The cooling device 101 includes a compressor (compressor) 11
, Condenser 12 and solenoid valve 13a (first evaporator valve)
, A capillary tube (capillary tube) 14a, an accumulator (liquid reservoir) 15, and two evaporators 16a (first evaporator) and 16b (second evaporator) connected in series to form a closed circuit. Series refrigerant pipe 17 constituting cooling circuit
A bypass refrigerant pipe 18 comprising an electromagnetic valve 13b (second evaporator valve) and a capillary tube 14b and connecting one evaporator 16b to the compressor 11 and the condenser 12 to form a closed-circuit cooling circuit; It is provided with. Then, a refrigerant is sealed in the cooling circuit and circulates in the cooling circuit. The evaporators 16a and 16b are provided in a cooling / heating storage 20 (first product storage) and a cooling-dedicated storage 19 (second product storage), respectively, which can switch between cooling and heating. Inside chambers 19 and 20 are provided with inside chamber temperature sensors 21a and 21b for detecting the inside temperature. The solenoid valves 13a and 13b are open / close valves, and are controlled to open / close by a control device (not shown).

[0003] With the above structure, the refrigerant condensed and liquefied in the condenser 12 passes through the solenoid valves 13a and 13b and the capillary tubes 14a and 14b and passes through the evaporator 16a.
a, 16b, and vaporizes inside the evaporator 16b.
By depriving a, 16b and its surroundings of latent heat,
The inside of each storage is cooled. Further, the evaporators 16a and 16b
Is temporarily stored in the accumulator 15 and then sucked into the compressor 11, where it is compressed to become a high-temperature and high-pressure gaseous refrigerant, sent out again to the condenser 12, liquefied, and circulated through the cooling circuit. .

With this configuration, for example, in winter, the solenoid valve 13a is closed and the other solenoid valve 13b is opened to supply the refrigerant only to the evaporator 16a disposed in the storage cabinet 19 exclusively for cooling. The cooling dedicated storage 19 is cooled by heating, and the heater 23 (not shown) arranged in the cooling / heating storage 20 is operated to heat the cooling / heating storage 20, and the cooled product and the heated product are heated. It is possible to sell both of the sold goods at the same time. In the summer, two solenoid valves 13a and 13
By controlling the opening and closing of b, the refrigerant is supplied to the two evaporators 16a and 16b disposed in the cooling only storage 19 and the cooling and heating storage 20, and the products in both storages are cooled and sold. It is possible.

By the way, such a conventional cooling device 10
In FIG. 1, a cooling storage 19 and a cooling and heating storage 2 are provided.
0, the solenoid valves 13a, 13b are alternately opened and closed at predetermined time intervals, and the refrigerant is evaporated by the evaporators 16a, 16b so that two chambers are preferably cooled simultaneously.
Supplied to Then, the inside temperature sensors 21a and 21b
When it is detected that the inside of the storage is cooled to a predetermined storage temperature, the electromagnetic valves 13a and 13b connected to the evaporators 16a and 16b provided in the storage are detected.
Is closed, the supply of the refrigerant is stopped, and the inside of the storage is controlled to be maintained at the storage temperature.

[0006]

However, when cooling only the cooling storage and the cooling and heating storage at the same time, the cooling load in each storage is not always constant. For example, when a product having a large cooling load is stored in one storage and a product having a small cooling load is stored in the other storage, the respective storages are alternately cooled for a predetermined time. However, there is a problem in that the inside of the refrigerator, in which a product having a large cooling load is stored, is not easily cooled, and the time required to reach a predetermined storage temperature is prolonged.

Further, the supply of the refrigerant to the evaporator is controlled based on the result of detection of the temperature in the storage by the temperature sensor in the storage, and the storage is cooled to the storage temperature. When frost is formed and freezes, etc., the temperature of the evaporator decreases, but the circulating air in the storage cannot pass through the evaporator, so that heat cannot be exchanged. In order to prevent this, if a defrosting time is provided for stopping the supply of the refrigerant to the evaporator at every predetermined time, the temperature of the product stored in the storage may not be maintained at the storage temperature. There was a problem that occurred.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and regardless of the magnitude of the cooling load of the storage, a plurality of storages are cooled almost simultaneously in a well-balanced manner, thereby shortening the cooling time and evaporating the storage. It is an object of the present invention to provide a vending machine cooling device in which a container is prevented from frosting and freezing and the inside of a storage is efficiently cooled.

[0009]

According to a first aspect of the present invention, there is provided a product storage for storing goods, an evaporator for cooling the inside of the product storage, and Temperature sensor for detecting the temperature of the evaporator, an evaporator temperature sensor for detecting the temperature of the evaporator, and an evaporator for setting the lower limit evaporator temperature and the upper limit evaporator temperature in accordance with the temperature detected by the temperature sensor in the refrigerator Temperature setting means, and control means for controlling the supply of refrigerant to the evaporator based on the temperature detection results of the in-compartment temperature sensor and the evaporator temperature sensor, wherein the control means When the detected temperature is equal to or higher than a predetermined internal setting temperature and the detected temperature of the evaporator temperature sensor is equal to or higher than the evaporator upper limit temperature, the supply of the refrigerant to the evaporator is started, and the evaporator temperature sensor is started. The detected temperature is By stopping the supply of refrigerant to the evaporator when reaching the serial lower evaporator temperature, it is possible to control the supply of refrigerant to the evaporator in response cooled state of the product storage.

According to a second aspect of the present invention, there is provided a first product storage for storing products, a second product storage, a first evaporator for cooling the inside of the first product storage, A second evaporator for cooling the inside of the second product storage, and a first evaporator for reducing the pressure after condensing the refrigerant discharged from the compressor;
A serial cooling circuit that supplies the second evaporator in order and returns the compressor, and a refrigerant discharged from the compressor is condensed and then decompressed and supplied to the second evaporator and returned to the compressor. A bypass cooling circuit, a first internal temperature sensor for detecting a temperature in the first product storage, a second internal temperature sensor for detecting a temperature in the second product storage, A first evaporator temperature sensor for detecting the temperature of the first evaporator, a second evaporator temperature sensor for detecting the temperature of the second evaporator, and the first in-compartment temperature sensor or the second Evaporator temperature setting means for setting the lower limit evaporator temperature and the upper limit evaporator temperature in accordance with the temperature detected by the in-chamber temperature sensor, and control for supplying a refrigerant to either the series cooling circuit or the bypass cooling circuit. Means, wherein the control means is configured to control the first internal temperature. When the detected temperature of and the detected temperature of the sensor is not more predetermined storage room set temperature equal to or higher than the first evaporator temperature sensor is equal to or higher than the upper limit evaporator temperature,
The supply of the refrigerant to the series cooling circuit is started, and when the temperature detected by the first evaporator temperature sensor reaches the lower limit evaporator temperature, the supply of the refrigerant to the series cooling circuit is stopped. When the detected temperature of the internal temperature sensor is equal to or higher than a predetermined internal setting temperature and the detected temperature of the second evaporator temperature sensor is equal to or higher than the upper limit evaporator temperature, the supply of the refrigerant to the bypass cooling circuit is started. When the temperature detected by the second evaporator temperature sensor reaches the lower limit evaporator temperature, the supply of the refrigerant to the bypass cooling circuit is stopped,
When the temperature detected by the internal temperature sensor is equal to or higher than a predetermined internal temperature and the temperature detected by the first evaporator temperature sensor is equal to or higher than the upper limit evaporator temperature, the supply of the refrigerant to the serial cooling circuit is performed. , The first product storage and the second product storage can be alternately and similarly cooled.

According to a third aspect of the present invention, in the first or second aspect of the invention, the evaporator temperature setting means sets the upper limit evaporator temperature to a temperature of 0 ° C. or more, so that Frost and ice can be prevented from adhering to the vessel.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. Note that the same reference numerals are used for the same configurations as those in the related art.

FIG. 1 is a diagram showing an embodiment of a cooling device 1 of the present invention mounted on a vending machine 2 for selling products such as beverages. As shown in the figure, the cooling device 1 includes a compressor 11, a condenser 12, a solenoid valve 13
a, a capillary tube 14a, an accumulator 15, and a series refrigerant pipe 17 that connects two evaporators 16a, 16b in series to form a closed-circuit cooling circuit;
It is provided with a solenoid valve 13b and a capillary tube 14b.
And a bypass refrigerant pipe 18 which is connected to a cooling circuit having a closed circuit shape. The evaporators 16a and 16b are provided in a cooling / heating storage 20 and a cooling-dedicated storage 19, respectively, which can switch between cooling and heating, and each of the evaporators 16a and 16b detects the temperature inside the evaporator. Evaporator temperature sensors 24a and 24b are provided. Further, in the storages 19 and 20, storage temperature sensors 21a and 21b for detecting the storage temperature are provided.

FIG. 2 shows a cooling device 1 constructed as described above.
The control block diagram of FIG. The cooling / heating switching device 25 sets the cooling / heating storage 20 to either cooling or heating. The in-compartment temperature sensors 21a and 21b and the evaporator temperature sensors 24a and 24b are sensors composed of, for example, a thermistor or the like, and detect the temperatures in the evaporators 16a and 16b, the cooling dedicated storage 19, and the cooling and heating storage 20. Control signal (control means, evaporator temperature setting means)
22. The control device 22 includes a microprocessor, a ROM, and a RAM.
In accordance with the control program stored in M, the lower limit evaporator temperature TE is determined according to the temperature detected by the internal temperature sensors 21a and 21b.
0 and the upper limit evaporator temperature (2 ° C. in this embodiment) are set, the opening and closing of the solenoid valves 13 a and 13 b are controlled, and the ON / OFF control of the compressor and the heater is performed.

In the cooling device 1 configured as described above,
For example, when the cooling / heating switching device 25 is operated in winter and the cooling / heating storage 20 is set to the heating mode, the electromagnetic valve 13a is closed by the control device 22 and the supply of the refrigerant to the evaporator 16a is stopped. Then, the heater 23 is energized to heat the inside of the cooling / heating storage 20. Further, the opening and closing of the solenoid valve 13b is controlled, and the refrigerant is appropriately supplied to the evaporator 16b, so that the cooling storage 19 is cooled. On the other hand, when the cooling / heating switching device 25 is operated in summer to set the cooling / heating storage 20 to the cooling mode, the control device 22 controls the solenoid valve 1.
3a and 13b are controlled to open and close, and the two evaporators 16a and 1b are controlled.
The coolant is appropriately supplied to 6b, and the inside of the storage 19 for exclusive use of cooling and the inside of the storage 20 for cooling and heating are cooled.

Next, a method for controlling the cooling device 1 of the present invention will be described with reference to the drawings. FIG. 3 is a flowchart illustrating a control method of the cooling device 1 when the cooling / heating storage 20 is set to the cooling mode. In FIG. 3, in step 1 (S1), the detection temperature T1 of the inside temperature sensor 21a disposed in the cooling / heating storage 20 has reached the temperature inside the cooling case (3 ° C. in the present embodiment). It is determined whether or not.

In step 2 (S2), the temperature sensor 2
If the detected temperature T1 of 1a is lower than 3 ° C., the flag F1 =
Let it be 1.

In step 3 (S3), the temperature sensor 2
When the detected temperature T1 of 1a is 3 ° C. or higher, the detected temperature TE1 of the evaporator temperature sensor 24a for detecting the temperature in the evaporator 16a provided in the cooling / heating storage 20 is 2 ° C. (upper limit evaporator). Temperature) or more.

As a result, the evaporator 16a is in a frosted state (actually, it can be estimated that the evaporator is in a frosted state when the detected temperature TE1 is 0 ° C. or less. The evaporator is determined to be in frost when:
If the evaporator 16a is in a frozen state, the supply of the refrigerant is avoided until the frost on the evaporator 16a is eliminated. Thereby, the heat exchange in the evaporator 16a is sufficiently performed, and the product S in the cooling / heating storage 20 can be efficiently cooled.

In step 4 (S4), the evaporator 16 is operated on the basis of the temperature detected by the temperature sensor 21a for cooling and heating.
The lower limit evaporator temperature TE0 of the evaporator temperature sensor 24a for stopping the supply of the refrigerant to a is set. In the case of this embodiment, when the detected temperature TE1 of the internal temperature sensor 21a is equal to or higher than 20 ° C., the lower limit evaporator temperature TE0 is −3 ° C., and the detected temperature TE1
Is less than 10 ° C and less than 20 ° C, the lower limit evaporator temperature TE0
Is set to −5 ° C., and when the detected temperature TE1 is lower than 10 ° C., the lower-limit evaporator temperature TE0 is set to −7 ° C.

By changing and setting the lower limit evaporator temperature TE0 reached by the evaporator according to the change in the temperature in the storage, the temperature in the evaporator is sufficiently cooled and left as it is. In a state where the inside of the refrigerator is cooled, waste of cooling the evaporator more than necessary as in the related art can be eliminated. In addition, frost formation on the evaporator can be prevented.

In step 5 (S5), the solenoid valve 13a is opened and the solenoid valve 13b is closed, so that the refrigerant
6a.

In step 6 (S6), the compressor 11
It is determined whether or not is operating.

In step 7 (S7), the compressor 11
Starts when is not running.

In step 8 (S8), it is determined whether or not the detected temperature TE1 of the evaporator temperature sensor 24a has reached the lower limit evaporator temperature TE0. If the lower limit evaporator temperature TE0 has not been reached, the refrigerant is continuously supplied.

As described above, the evaporator 16a is controlled based on the detection results of the internal temperature sensor 21a and the evaporator temperature sensor 24a.
Control of the supply of the refrigerant to the cooling and heating storage 20
The inside can be efficiently and reliably cooled to the set temperature in the cooling box.

In step 9 (S9), the cooling-dedicated storage 1
Then, it is determined whether or not the detected temperature T2 of the in-compartment temperature sensor 21b disposed at 9 has reached the set temperature in the cooling compartment of 3 ° C.

In step 10 (S10), when the temperature T2 detected by the in-chamber temperature sensor 21b is lower than 3 ° C. and the flag F1 =
It is determined whether it is 1 or not.

In step 11 (S11), the flag F =
When it is 1, the compressor 11 is stopped. Then, the flag F is set to 0.

Step 12 (S12) is an evaporator temperature sensor for detecting the temperature in the evaporator 16b provided in the cooling storage 19 when the temperature T2 detected by the internal temperature sensor 21b is 3 ° C. or higher. It is determined whether or not the detected temperature TE2 of 24b is 2 ° C. or higher.

In step 13 (S13), the evaporator 1 is operated on the basis of the temperature detected by the temperature sensor 21b in the storage dedicated to cooling.
Evaporator temperature sensor 24b for stopping the supply of the refrigerant to the evaporator 6b
The lower limit evaporator temperature TE0 is set. (The setting is in accordance with Step 4.) Step 14 (S14) is performed by the solenoid valve 13.
b is opened and the solenoid valve 13a is closed so that the refrigerant is supplied only to the evaporator 16b.

Step 15 (S15) determines whether or not the compressor 11 is operating.

Step 16 (S16) is started when the compressor 11 is not operating.

In step 17 (S17), it is determined whether or not the detected temperature TE2 of the evaporator temperature sensor 24b has reached the lower limit evaporator temperature TE0. When the lower limit evaporator temperature TE0 has not been reached, the refrigerant is continuously supplied.

The cooling device 1 is controlled as described above. Further, by controlling in this manner, the cooling / heating storage 20 and the cooling-dedicated storage 19 can be cooled in substantially the same manner with good balance, and the cooling time can be shortened.

Next, a control method of the cooling apparatus 1 for cooling the inside of the cooling dedicated storage 19 when the cooling / heating storage 20 is set to the heating mode is shown in a flowchart of FIG.
FIG. 5 is a flowchart illustrating a control method of the heater 23 that heats the cooling / heating storage 20.

First, in FIG. 4, step 21 (S2
In 1), the electromagnetic valve 13b is opened and the electromagnetic valve 13a is closed so that the refrigerant is supplied only to the evaporator 16b.

In step 22 (S22), the detected temperature T of the internal temperature sensor 21b disposed in the storage 19 for exclusive use of cooling is detected.
It is determined whether or not 2 has reached the set temperature 3 ° C. in the refrigerator.

In step 23 (S23), the compressor 11 is stopped when the temperature T2 detected by the internal temperature sensor 21b is lower than 3 ° C.

In step 24 (S24), when the temperature T2 detected by the temperature sensor 21b in the refrigerator is 3 ° C. or more, the evaporator temperature sensor for detecting the temperature in the evaporator 16b provided in the cooling storage 19 is used. It is determined whether or not the detected temperature TE2 of 24b is 2 ° C. or higher.

In step 25 (S25), the evaporator 1 is operated based on the temperature detected by the temperature sensor 21b in the storage dedicated to cooling.
Evaporator temperature sensor 24b for stopping the supply of the refrigerant to the evaporator 6b
The lower limit evaporator temperature TE0 is set. (The setting is in accordance with Step 4.) In Step 26 (S26), it is determined whether or not the compressor 11 is operating.

Step 27 (S27): Compressor 1
Starts when 1 is not running.

Step 28 (S28): It is determined whether or not the detected temperature TE2 of the evaporator temperature sensor 24b has reached the lower limit evaporator temperature TE0. If the lower limit evaporator temperature TE0 has not been reached, the refrigerant is continuously supplied. The cooling device 1 is controlled as described above. In FIG. 5, step 31 (S31) is a process in which the detection temperature T1 of the inside temperature sensor 21a provided in the cooling and heating storage case 20 is set to the heating room set temperature (55 ° C. in the present embodiment). ) Is determined.

In step 32 (S32), if the temperature T1 detected by the internal temperature sensor 21a is 55.degree.
The energization of 3 is stopped.

In step 33 (S33), if the temperature T1 detected by the in-chamber temperature sensor 21a is 55 ° C. or lower, the heater 23 provided in the cooling and warming storage 20 is energized. As described above, the power supply to the heater 23 is controlled, and the cooling / warming storage 20 is heated.

As described above, in the cooling circuit configuration of the present invention, as shown in FIG. 1, two evaporators 16a and 16b are provided downstream of the capillary tube 14a, and two evaporators are provided downstream of the capillary tube 14b. Table 16
By disposing b, the capacity of the evaporator disposed downstream of each of the capillary tubes 14a and 14b is always constant. Therefore, an apparatus such as an expansion valve for variably adjusting the refrigerant amount is not required. Solenoid valves 13a and 13b are provided in each of the refrigerant pipes for dividing the refrigerant protruding from the condenser 12 into two parts, and alternately open and close to reliably branch the refrigerant into the respective pipes. No refrigerant flows through the pipe, and no special device such as a refrigerant distributor (flow regulator) is required. As described above, since the configuration of the cooling device 1 of the present invention is relatively simple, control of the cooling device 1 can be facilitated, and the highly reliable cooling device 1 can be provided.

[0047]

As described above, according to the first aspect of the present invention, by controlling the supply of the refrigerant to the evaporator according to the cooling state of the article storage, the evaporator can be used more than necessary. Thus, it is possible to prevent the freezing and to prevent the freezing, and it is possible to reliably cool to the set cooling temperature.

According to the second aspect of the present invention, the first and second commodity storages are alternately and similarly cooled, so that the two storages are cooled almost at the same time with good balance. Can be.

According to the third aspect of the present invention, by preventing frost and ice from adhering to the evaporator, the product in the product storage can be reliably cooled.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a cooling device of the present invention.

FIG. 2 is a control block diagram of the cooling device of the present invention.

FIG. 3 is a flowchart illustrating a control method of the cooling device of the present invention when the cooling / warming storage is set to a cooling mode.

FIG. 4 is a flowchart illustrating a control method of the cooling device of the present invention when the cooling / warming storage is set to a heating mode.

FIG. 5 is a flowchart illustrating a heater control method according to the present invention when the cooling / warming storage is set to the heating mode.

FIG. 6 is a diagram showing an embodiment of a conventional cooling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Compressor (compressor) 12 Condenser 13a Solenoid valve 13b Solenoid valve 16a Evaporator (1st evaporator) 16b Evaporator (2nd evaporator) 17 Series refrigerant pipe 18 Bypass refrigerant pipe 19 Storage only for cooling (No. 2) Storage unit for cooling and heating (first product storage unit) 21a Internal temperature sensor 21b Internal temperature sensor 22 Control device (evaporator temperature setting means, control means) 24a Evaporator temperature sensor 24b Evaporator temperature sensor

Continued on front page F term (reference) 3E044 AA01 CA09 CB05 CC08 DB16 FB11 3L045 AA01 BA01 CA02 DA02 HA02 HA06 JA02 JA14 MA02 MA04 PA02 PA03

Claims (3)

[Claims] 1. An article storage for storing articles, an evaporator for cooling the inside of the article storage, an inside temperature sensor for detecting a temperature in the article storage, and detecting a temperature of the evaporator. An evaporator temperature sensor, evaporator temperature setting means for setting a lower limit evaporator temperature and an upper limit evaporator temperature according to the temperature detected by the internal temperature sensor, and control means for controlling supply of refrigerant to the evaporator. The control unit is configured to control the evaporator when the temperature detected by the internal temperature sensor is equal to or higher than a predetermined internal temperature and the temperature detected by the evaporator temperature sensor is equal to or higher than the evaporator upper limit temperature. The supply of the refrigerant to the evaporator is stopped when the temperature detected by the evaporator temperature sensor reaches the lower limit evaporator temperature, and the supply of the refrigerant to the evaporator is stopped. 2. A first product storage for storing products, a second product storage, a first evaporator for cooling the inside of the first product storage, and the second product storage. A second evaporator for cooling the inside, and a series cooling circuit for condensing the refrigerant discharged from the compressor, reducing the pressure, supplying the first evaporator and the second evaporator in this order, and returning to the compressor A bypass cooling circuit for condensing the refrigerant discharged from the compressor and then reducing the pressure and supplying the reduced pressure to the second evaporator and returning the refrigerant to the compressor; and detecting a temperature in the first product storage. A first in-compartment temperature sensor, a second in-compartment temperature sensor for detecting the temperature in the second product storage, and a first evaporator temperature sensor for detecting the temperature of the first evaporator. A second evaporator temperature sensor for detecting a temperature of the second evaporator, and a first internal temperature sensor or Evaporator temperature setting means for setting a lower limit evaporator temperature and an upper limit evaporator temperature in accordance with the temperature detected by the second internal temperature sensor; and supplying a refrigerant to one of the series cooling circuit or the bypass cooling circuit. Control means, wherein the detected temperature of the first internal temperature sensor is equal to or higher than a predetermined internal temperature and the detected temperature of the first evaporator temperature sensor is When the temperature is equal to or higher than the upper limit evaporator temperature, the supply of the refrigerant to the series cooling circuit is started, and the supply of the refrigerant to the series cooling circuit is performed when the temperature detected by the first evaporator temperature sensor reaches the lower limit evaporator temperature. When the supply of the refrigerant to the series cooling circuit is stopped, the temperature detected by the second inside temperature sensor is equal to or higher than a predetermined inside temperature and the second evaporator temperature. The temperature detected by the sensor When the temperature is equal to or higher than the upper limit evaporator temperature, the supply of the refrigerant to the bypass cooling circuit is started, and the supply of the refrigerant to the bypass cooling circuit is performed when the temperature detected by the second evaporator temperature sensor reaches the lower limit evaporator temperature. A cooling device for a vending machine. 3. The cooling device for a vending machine according to claim 1, wherein the evaporator temperature setting means sets the upper limit evaporator temperature to a temperature of 0 ° C. or higher.