JP3526945B2 - Vending machine cooling system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device mounted in an automatic vending machine for selling products such as canned beverages to cool the products.

[0002]

2. Description of the Related Art Conventionally, a cooling device shown in FIG. 4 has been known as a cooling device mounted on an automatic vending machine for selling products such as canned beverages. This cooling device 51 includes a compressor (compressor) 60, a condenser (condenser) 61, a distributor 58, electromagnetic valves 57a and 57b, capillaries (capillary tubes) 53a and 53b, and evaporators (evaporators) 54a and 54b. And the accumulator 59
And a refrigerant pipe 56 that connects them in series and constitutes a closed circuit refrigeration circuit.
A refrigerant such as CFC is enclosed in the refrigerant pipe 56 and circulates in the refrigeration circuit.

With the above configuration, the capacitor 61
The refrigerant that has been condensed and liquefied in (1) is sent to the distributor 58 through the refrigerant pipe 56 and is branched into two. The electromagnetic valves 57a and 57b are ON (open) / OFF (closed) type valves and are controlled to be opened and closed by a controller (not shown) or the like. The capillaries 53a and 53b are a kind of capillaries, and are adjusted so that the refrigerant flows evenly to the respective evaporators 54a and 54b on the downstream side even if the amount of the refrigerant flowing through either of the two branched refrigerant pipes 56a or 56b changes. . The liquid refrigerant that has flowed into the evaporators 54a and 54b is depressurized and vaporized in the evaporators 54a and 54b, and at this time, the latent heat of the refrigerant is removed from the evaporator and its surroundings to perform cooling. Each evaporator 54a
And the refrigerant discharged from 54b is stored in the accumulator 59 by 1
It joins two tubes and is sent to the compressor 60. The refrigerant is compressed by the compressor 60 and becomes a high temperature and high pressure gas.
This high-temperature, high-pressure gaseous refrigerant is sent to the condenser 61, cooled by a heat radiation fan or the like, and liquefied. The liquefied refrigerant is sent again to the evaporators 54a and 54b by the refrigerant pipe 56 and used again for cooling.

Inside the vending machine in which the cooling device 51 is mounted, there are provided three product storage compartments (not shown) partitioned by heat insulating partition walls. Two of the product storages are dedicated to cooling, and one product storage has a structure capable of both cooling and heating. For this reason, the two product storages dedicated to cooling have a structure in which cool air can circulate with each other, and the evaporator 54a is installed inside one of the two product storages dedicated to cooling. The products in both of these product storages are cooled. The evaporator 54b is installed inside the above-mentioned cooling / heating dual-use product storage, and cools the products in the cooling / heating dual-use product storage.

With this configuration, for example,
In winter, the solenoid valve 57b is closed to stop the supply of the refrigerant to the evaporator 54b in the above-mentioned cooling / heating commodity storage box, and instead operate a heater (not shown) to heat one commodity storage box. In this way, the circulation with the inside of the exclusive cooling chamber is cut off, and heating is performed by the heater having no evaporator. On the other hand, in the summer, both solenoid valves 57a and 57b can be opened to supply the refrigerant to both evaporators 54a and 54b to cool the inside of the three product storages.

[0006]

However, in the above-described conventional cooling device for a vending machine, the evaporator 5 in the product storage for both cooling and heating, which is not used in the winter, is used.
When the cooling medium is caused to flow into 4b to restart the cooling, the cooling medium tends to flow toward the evaporator 54a that is already in operation, and the cooling of the evaporator 54b does not proceed easily.

Further, in general, when the capacity of the compressor is constant and the amount of refrigerant supplied to the evaporator increases,
Although the evaporation amount of the refrigerant increases, the evaporation temperature of the refrigerant rises, which causes a problem that the cooling temperature in the product storage compartment rises. Therefore, the structure is simply changed to increase the refrigerant flow rate to the evaporator 54b. Just the evaporator 5
The temperature of 4b, that is, the cooling temperature of the product storage does not drop to a desired temperature value.

An object of the present invention is to provide a cooling device for a vending machine capable of rapid cooling and having an improved life of liquid back control.

[0009]

In order to solve the above-mentioned problems, a cooling device for a vending machine according to the present invention has an evaporator forming a part of a refrigeration circuit in each of a plurality of product storages. Then, in the cooling device of the vending machine configured to cool the plurality of product storage boxes independently of each other by sending the refrigerant to each of the evaporators and evaporating the refrigerant in each of the evaporators, Expansion valve provided on the upstream side of the evaporator, the opening of the valve is variable by control, and each evaporation of the branching refrigerant pipe branched toward the evaporator on the downstream side of the electronic expansion valve. Of the evaporator valve that is provided on the inlet side of the evaporator and that can be opened or closed, and the opening of the electronic expansion valve according to the combination of opening and closing of each of the evaporator valves. A ratio equal to or the ratio Was determined to be low ratio than, constructed and a control means for controlling said electronic expansion valve so that the valve opening.

In the above, when the number of the goods storage and the number of evaporators is 3, the control means controls the ratio of the opening degree of the electronic expansion valve to the whole of the evaporator valves which are open. Is 2/3, the valve opening is set to a value that is twice the valve opening when the ratio of the evaporator valves that are open to the total is 1/3, and the evaporator valve that is open is When the ratio to the whole is 3/3, it is decided to maintain the valve opening when the ratio of the evaporator valves that are open to the whole is 2/3, and the valve opening is set to the valve opening. It may be configured to control the electronic expansion valve.

Further, in the above, a temperature sensor for detecting the temperature in each of the commodity storages is provided, and the control means is
When all of the valves for the evaporator are open, the determined opening degree of the electronic expansion valve is determined according to the temperature in each of the product storages detected by each of the temperature sensors. The electronic expansion valve may be configured to be controlled so that the valve opening is equal to the opening of the electronic expansion valve or the valve opening is determined by correcting the determined opening of the electronic expansion valve. Good.

[0012]

According to the present invention having the above structure, the flow rate of the refrigerant that is branched and supplied to each evaporator is controlled by the electronic expansion valve. The opening of the electronic expansion valve is equal to or lower than the ratio of the evaporator valves that are open to the whole, that is, the ratio of the evaporator valves that are open. It is controlled so as to be equal to or smaller than the ratio.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings.

[0014]

In order to solve the above-mentioned problems, according to the present invention, an evaporator forming a part of a refrigeration circuit is installed in each of a plurality of product storages, and a refrigerant is supplied to each evaporator. In a cooling device of a vending machine configured to cool the plurality of product storage boxes independently of each other by evaporating the refrigerant in each of the evaporators, the refrigerant pipes on the upstream side of the evaporators are provided. is a opening variable one electronic expansion valve of the valve by the control, provided on the inlet side of the evaporator downstream in the branch refrigerant pipe diverged toward the evaporators of the electronic expansion valve previously constant depending on being an open or closable evaporator valve, the combination of opening and closing of the respective evaporator valve
From the value of the table that indicates the opening degree of the electronic expansion valve that has been set, the opening degree of the electronic expansion valve is equal to the ratio of the opening of the evaporator valve to the whole, or more than the ratio. And a control means for controlling the electronic expansion valve so that the valve opening degree is set to a low ratio.

The cooling device 1 shown in FIG.
, A refrigerant pipe 6 which is a refrigerant pipe, evaporators 4a, 4b and 4c which are three evaporators, and temperature sensors 5a and 5
b, 5c and a controller 3 as a control means. Each evaporator 4a-4c is arrange | positioned inside each of each goods storage 20a-20c.

The cooling device main body 2 is provided with a compressor, a condenser, an electromagnetic valve, etc., which will be described later, and supplies a liquid refrigerant for cooling. The liquid refrigerant supplied from the cooling device main body 2 is sent to the evaporators 4a to 4c by the refrigerant pipe 6 and evaporated in the evaporators 4a to 4c to remove the latent heat of the refrigerant from the evaporator and its surroundings to store each product. Product G that is stored inside after cooling the inside independently
To cool. The temperature sensors 5a to 5c are used for storing the respective product storage 2
0a to 20c provided in each of the product storage boxes 20a to 20c
The internal temperature TR is detected and output to the controller 3 as a temperature signal. The controller 3 uses the temperature sensors 5a to 5c.
The temperature signals TRa to TRc in the product storage boxes 20a to 20c are monitored in response to the temperature signal from the device, and a control signal is output to the cooling device body 2 according to each condition.

Two of the three product storage boxes 20a to 20c, for example, the product storage box 20a are assigned to the product storage boxes dedicated to cooling the product G such as a canned beverage, and the other two.
One product storage, for example, product storage 20b to 20c is assigned to a product storage that performs both cooling and heating. Therefore, for example, a heater (not shown) is provided inside the product storage 20c.

With this configuration, for example,
The evaporator 4a in the product storage 20a is constantly supplied with a refrigerant from the cooling device body 2 to cool the product, but in the winter, the controller 3 outputs a control signal to the cooling device body 2 to cool the product. A later-described electromagnetic valve in the apparatus body 2, for example, an electromagnetic valve 7c (see FIG. 2) is closed, and the evaporator 4c in the above-mentioned cooling / heating commodity storage box 20c is closed.
The supply of the refrigerant to the cooling unit is stopped, and a heater (not shown) is operated instead to heat the inside of the product storage box 20c. In the summer, the controller 3 outputs a control signal to the cooling unit main body 2 so that the inside of the cooling unit main body 2 can be heated. Later described solenoid valve, for example 7c
(Refer to FIG. 2) can be opened, the refrigerant can be supplied to the evaporator 4c, and it can be switched so as to cool the inside of the product storage 20c as well. Switching between the heating mode and the cooling mode of the product storage 20c is performed by a changeover switch (not shown) for controlling the solenoid valve 7c to be turned on and off.

Next, a more detailed structure of the cooling device 1 will be described with reference to FIG. As shown in the figure,
The cooling device 1 includes a compressor (compressor) 10, a condenser (condenser) 11, an electronic expansion valve 12, a distributor 8, and solenoid valves 7a, 7 which are valves for an evaporator.
b, 7c, evaporators 4a, 4b, 4c, accumulator 9, and refrigerant pipes 6, 6a, 6b, 6 that connect these in series and constitute a closed circuit refrigeration circuit.
c, temperature sensors 5a, 5b, 5c, and controller 3
It is configured with. A refrigerant such as CFC is enclosed in the refrigerant pipe 6 and circulates in the refrigeration circuit.
Here, the compressor 10, the condenser 11, the electronic expansion valve 12, the distributor 8, and the solenoid valves 7a ...
7c, the accumulator 9, and the refrigerant pipes 6, 6a to 6c that connect them in series constitute the cooling device body 2.

The solenoid valves 7a to 7c and the electronic expansion valve 1 described above.
A signal line for outputting a control signal from the controller 3 is connected to 2. Further, the refrigerant pipe 6 is branched into three by a distributor 8 downstream of the electronic expansion valve 12,
It becomes the refrigerant pipes 6a, 6b, 6c of the book. Refrigerant pipe 6
The solenoid valve 7a and the evaporator 4a are connected in series to a, and the solenoid valve 7b and the evaporator 4b are connected to the refrigerant pipe 6b.
However, the solenoid valve 7c and the evaporator 4c are connected in series to the refrigerant pipe 6c, respectively. The three refrigerant pipes 6 a, 6 b, 6 c are joined to one refrigerant pipe 6 downstream of the evaporators 4 a to 4 c and connected to the accumulator 9. Also, the compressor 10 and the condenser 1
A refrigerant pipe (not shown) in which a muffler for preventing overheating of the compressor 10 is interposed may be circulated between 1 and 1.

With the above configuration, the capacitor 11
The refrigerant condensed and liquefied in (1) is sent to the electronic expansion valve 12 through the refrigerant pipe 6. The electronic expansion valve 12 is a variable valve opening type expansion valve equipped with, for example, a stepping motor, and the valve opening is digitally controlled by a control signal output from the controller 3. The valve opening control signal is composed of, for example, a pulse signal, and the valve opening is increased / decreased according to a predetermined pulse position, and the supply amount of the refrigerant to each of the evaporators 4a to 4c is adjusted here.

The refrigerant having passed through the electronic expansion valve 12 is sent to the distributor 8 and is branched into three. The solenoid valves 7a to 7c on the downstream side are valves that are controlled to be in either an ON (open) or OFF (closed) state, and are opened / closed by a control signal from the controller 3.

The liquid refrigerant flowing into each of the evaporators 4a to 4c is depressurized and vaporized in each of the evaporators 4a to 4c, and at this time, the latent heat of the refrigerant is taken from the evaporator and its surroundings to perform cooling. Each evaporator 4a-4c
The refrigerant discharged from the refrigerant merges into one refrigerant pipe 6 by the accumulator 9 and is sent to the compressor 10. The refrigerant is compressed by the compressor 10 and becomes high-temperature and high-pressure gas. The high-temperature and high-pressure gaseous refrigerant is sent to the condenser 11 and cooled by a heat radiation fan or the like to be liquefied. This liquefied refrigerant is again fed through the refrigerant pipe 6 to the evaporator 4
a to 4c and used again for cooling.

The temperature sensors 5a-5c are, for example, sensors such as thermistors, and are used as product storage boxes 20a-20c.
The internal temperatures TRa to TRc are detected, converted into electric signals and output to the controller 3. The controller 3 is C (not shown).
It is composed of a kind of microcomputer having a PU, a ROM and a RAM, and turns on / off the solenoid valves 7a to 7c according to an operation from the outside or a control program stored in the ROM.
The OFF control, the valve opening control of the electronic expansion valve 12, and the control of other parts of the cooling device are performed.

Next, the control procedure in the controller 3 of the cooling device 1 of this embodiment will be described with reference to the flow chart of FIG.

First, the controller 3 performs electronic expansion from the values in the table of "electromagnetic valve opening / closing pattern and electronic expansion valve opening" in the table stored in the ROM (not shown) in the controller 3 described above. The degree of opening of the valve 12 is determined (step S1).

That is, the controller 3 has the product storage boxes 20a to 20c output from the temperature sensors 5a to 5c.
In order to stop the evaporation of the refrigerant in the evaporator whose temperature has dropped to a predetermined cooling temperature according to the internal temperature of 20c, a closing control signal is output to the solenoid valve that communicates with the evaporator that has reached the predetermined cooling temperature, and the valve is closed. Let Each solenoid valve 7
There are 8 patterns of opening and closing a to 7c, and the table below shows the opening degree of the electronic expansion valve 12 in each case for each pattern.

[0028]

[Table 1] Is a table of "electromagnetic valve opening / closing pattern and electronic expansion valve opening degree" shown in FIG.
It is stored in M.

For each opening / closing pattern of the solenoid valves 7a to 7c, the valve opening degree of the electronic expansion valve 12 in that case is shown in the rightmost column of the above table. The numerical values 80 to 160 are values indicating the pulse position in the valve opening control signal, and the larger the value, the larger the opening of the valve.

As shown in the table of "electromagnetic valve opening / closing pattern and electronic expansion valve opening degree", the controller 3 of the cooling device 1 of this embodiment sets the valve opening degree to 80 when all the electromagnetic valves are closed. If any one solenoid valve is open and the other two solenoid valves are closed, the valve opening degree of the electronic expansion valve 12 is set to 8
0, and when any two solenoid valves are open and the other one is closed, the valve opening is set to 160, and when all the solenoid valves are opened, the valve opening is set to 160. decide.

That is, the controller 3 determines that the opening degree of the electronic expansion valve 12 is 2/3 of the solenoid valves that are open to the entire solenoid valve (when the two solenoid valves are open). , Of the solenoid valves that are open to the whole ratio is 1/3 (when one solenoid valve is open), it is controlled to be 160 which is twice the valve opening 80. Therefore, in this case, the degree of opening of the electronic expansion valve is determined so as to be equal to the ratio of the solenoid valves that are open to the whole.

However, the controller 3 opens the solenoid valves when the ratio of the solenoid valves that are open to the whole is 3/3 (when the three solenoid valves are open). Electronic expansion valve 12 when the ratio of things to the whole is 2/3 (when two solenoid valves are open)
Since it is controlled to maintain the opening value of 160,
In this case, the ratio of the solenoid valves that are open to the whole increased 1.5 times from 2/3 to 3/3, but without increasing it, the increase ratio was more than 1.5. This means that the opening degree of the electronic expansion valve is determined so that it becomes a low ratio of 1.0.

In this way, the controller 3 of this embodiment is
Controls the electronic expansion valve opening so as to be equal to or smaller than the ratio of the electromagnetic valves that are open among the electromagnetic valves 7a to 7c. Therefore, the amount of refrigerant supplied to each evaporator 4a to 4c Is a little suppressed, rapid cooling can be performed without raising the evaporation temperature of the evaporator, and wasteful refrigerant is not passed to the evaporator, which is energy saving.

Next, the controller 3 controls the solenoid valves 7a to 7
It is determined whether or not all c are ON (open) (step S2). As a result, when the result is "NO", that is, when it is a stage other than the uppermost stage of the above-mentioned "solenoid valve opening / closing pattern and electronic expansion valve opening" table, the process proceeds to step S7 in this case. Then, the controller 3 outputs the valve opening control signal having the determined pulse position of the electronic expansion valve opening to the electronic expansion valve 12. As a result, the electronic expansion valve 12 moves the valve so as to reach the valve opening determined as described above.

As a result of the determination in step S2, "YE
In the case of "S", it means that all the solenoid valves are open, that is, in the case of the uppermost stage of the above "solenoid valve opening / closing pattern and electronic expansion valve opening" table. In step S3, the controller 3 receives the temperature signals from the temperature sensors 5a to 5c in the product storages 20a to 20c as inputs.

Next, the controller 3 controls each temperature sensor 5
Each product storage 20a-20c sent from a-5c
Of the internal temperatures TRa to TRc, the highest temperature is determined as the "highest internal temperature" (step S4).

Then, the controller 3 determines that the maximum internal temperature determined as described above is the "maximum internal temperature" in the table stored in the ROM (not shown) in the controller 3. The table below is a table of "temperature range and correction value of electronic expansion valve opening"

[0038]

[Table 2] The opening degree to be taken by the electronic expansion valve 12 is searched and determined from the value of (step S5, S6).

That is, in the case where all the electromagnetic valves are opened among the electronic expansion valve openings determined in step S1, the controller 3 further increases the electronic expansion valve openings according to the maximum internal temperature. The controller 3 is programmed to make a correction, first determines which temperature range the maximum internal temperature falls within by determining from the left column of the above table (step S5), and in the case of that temperature range, the electronic expansion is performed. The correction value of the valve opening that the valve 12 should take is read from the right column of the stage and determined (step S6).

That is, as shown in the table, when the maximum internal temperature is within the temperature range of 19 ° C. to 65 ° C., the controller 3 determines that all the solenoid valves described above are open. It is determined to add a correction value to the electronic expansion valve opening degree 160. However, when the maximum internal temperature becomes lower than the above range, the controller 3 causes the electronic expansion valve opening degree 16 above.
The smaller valve opening is corrected to 0 to determine. That is, when the maximum internal temperature is within the temperature range of 15 ° C to 18 ° C, the controller 3 determines that the electronic expansion valve opening degree 16
When the maximum internal temperature is within the temperature range of 11 ° C to 14 ° C, the controller 3 adds the correction value +80 to the electronic expansion valve opening degree 160. In addition, the electronic expansion valve opening 240 is determined.

Next, the controller 3 performs the above step S
The valve opening control signal having the pulse position of the electronic expansion valve opening determined in 6 is output to the electronic expansion valve 12. As a result, the electronic expansion valve 12 moves the valve so as to reach the valve opening determined as described above.

That is, the controller 3 of this embodiment is
When all the solenoid valves 7a to 7c are open, the opening degree of the electronic expansion valve 12 determined in step S1 is detected by the temperature sensors 5a to 5c.
According to the temperature in c, a valve opening equal to the electronic expansion valve opening determined in step S1 or a valve opening obtained by correcting the valve opening is determined, and the electronic opening is set to the valve opening. Expansion valve 1
Control 2

The present invention is not limited to the above embodiment. The above-mentioned embodiment is an exemplification, has substantially the same configuration as the technical idea described in the scope of the claims of the present invention, and has any similar effect to the present invention. It is included in the technical scope of the invention.

For example, in the above embodiment, an example in which the number of product storages and the number of evaporators is three has been described, but the present invention is not limited to this, and the number of product storages and evaporators as a whole. Any number may be used as long as it is two or more.

Further, in the above embodiment, the example in which the temperature sensor is provided in the product storage has been described, but the present invention is not limited to this, and the temperature sensor may be provided in the evaporator. I don't care.

Further, in the above embodiment, an example in which an ON (open) / OFF (close) control type solenoid valve is used as the evaporator valve has been described, but the present invention is not limited to this, and the evaporator valve is not limited to this. An electronic expansion valve may be used as. In that case, the controller may control the valve opening degree of each evaporator valve in the same manner as in the above embodiment.

Alternatively, instead of the stepping motor type electronic expansion valve, another type of variable opening type expansion valve may be adopted.

Further, in the above-described embodiment, when the ratio of the opening degree of the electronic expansion valve 12 to the total of the solenoid valves 7a to 7c that are opened is 2/3, the solenoid valves are opened. The ratio of what is done to the whole is 1 /
When the value is 160, which is twice the valve opening 80 in the case of 3, the ratio of the solenoid valves that are open to the whole is 3 /
In the case of 3, the value 160 of the opening degree of the electronic expansion valve 12 when the ratio of the solenoid valves that are open to the whole is 2/3 is maintained, and when the solenoid valves are all open If the maximum internal temperature is within the temperature range of 19 ° C to 65 ° C, the correction 160 is added to the electronic expansion valve opening 160 to make the electronic expansion valve opening 320, and the maximum internal temperature is 15 ° C.
When the temperature is within the range of -18 ° C, the electronic expansion valve opening is 1
With the correction of 20, the maximum internal temperature is 11 ° C to 14 ° C
An example in which the electronic expansion valve opening is corrected by 80 when the temperature is within the temperature range is described, but the present invention is not limited to this and other valve opening values may be used. In short, depending on the combination of opening and closing of the solenoid valve that is the evaporator valve, the opening degree of the electronic expansion valve is set to a ratio equal to the ratio of the evaporator valve that is open to the whole or a ratio lower than the ratio. Any valve opening may be used as long as it is determined to control the electronic expansion valve to have the valve opening, and the opening of the electronic expansion valve determined as described above is , Correction is made according to the temperature condition according to the temperature inside each product storage detected by each temperature sensor, and the valve opening equal to the above-mentioned determined opening of the electronic expansion valve or its electronic expansion valve opening is corrected. In addition, any valve opening may be used as long as the electronic expansion valve is controlled so as to have the determined valve opening.

[0049]

As described above, according to the present invention,
Since the flow rate of the main pipe of the refrigerant branched and supplied to each evaporator is controlled by using the electronic expansion valve, finer control of the refrigerant flow rate becomes possible as compared with the conventional mechanical expansion valve or the like.

Further, the opening degree of the electronic expansion valve is set to be equal to or lower than the ratio of the evaporator valves that are open to the whole, that is, the evaporator valve that is open. Since the control is performed so as to be equal to or smaller than the ratio, the rapid cooling is possible without raising the evaporation temperature of each evaporator, and energy saving is achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an automatic vending machine equipped with a cooling device according to an embodiment of the present invention.

FIG. 2 is a detailed block diagram showing a configuration of a cooling device in the vending machine shown in FIG.

FIG. 3 is a flowchart showing a control procedure in a controller of the cooling device of the vending machine shown in FIGS. 1 and 2.

FIG. 4 is a block diagram showing a configuration of a conventional example of a cooling device for a vending machine.

[Explanation of symbols]

1 Cooling device 2 Cooling device body 3 controller 4a-4c evaporator 5a-5c Temperature sensor 6,6a-6c Refrigerant pipe 7a-7c Solenoid valve 8 distributors 9 Accumulator 10 compressor 11 capacitors 12 Electronic expansion valve 20a-20c product storage 51 Cooling device 53a, 53b capillaries 54a, 54b evaporator 56,56a, 56b Refrigerant pipe 57a, 57b Solenoid valve 58 distributor 59 Accumulator 60 compressor 61 Capacitor 100 vending machines G product

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuyoshi Tajima 2-5-5 Keihan Hon-dori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-5-189650 (JP, A) Kaihei 5-325005 (JP, A) JP-A-6-34208 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25D 11/00 101 G07F 9/10 102

Claims (3)

(57) [Claims] 1. An evaporator forming a part of a refrigeration circuit is installed in each of a plurality of product storages, and a refrigerant is sent to each of the evaporators to evaporate the refrigerant in each of the evaporators. in the cooling device of the vending machine a plurality of commodity storage chamber configured to cool independently of one another, each evaporator is provided upstream refrigerant tube, opening variable one electron valves by the control An expansion valve, an evaporator valve that is provided on the inlet side of each evaporator of a branch refrigerant pipe branched toward the respective evaporators downstream of the electronic expansion valve and that can be opened or closed, and for each evaporator Predetermined according to the combination of valve opening and closing
From the value of the table that indicates the opening degree of the electronic expansion valve that has been set, the opening degree of the electronic expansion valve is equal to the ratio of the opening of the evaporator valve to the whole, or more than the ratio. A cooling device for a vending machine, comprising: a control unit that determines a low ratio and controls the electronic expansion valve so that the valve opening degree is set. 2. When the number of product storages and the number of evaporators are three, the control means sets the opening degree of the electronic expansion valve to
When the ratio of the open valves of the evaporator valve to the whole is 2/3, it is twice the valve opening when the ratio of the open valves of the evaporator valve to the whole is 1/3. When the ratio of the open valves of the evaporator valve to the whole is 3/3, the valve opening when the ratio of the open valves of the evaporator valve to the whole is 2/3 The cooling device for a vending machine according to claim 1, wherein the electronic expansion valve is controlled so as to be maintained and the valve opening degree is maintained. 3. A temperature sensor for detecting a temperature inside each of the product storages is provided, and the control means opens the determined electronic expansion valve when all of the evaporator valves are open. According to the temperature in each of the product storages detected by each of the temperature sensors, to a valve opening equal to the determined opening of the electronic expansion valve or the determined opening of the electronic expansion valve The cooling device for a vending machine according to claim 1 or 2, wherein the electronic expansion valve is controlled so as to have the valve opening determined by adding.