JPS58173367A - Cold and hot changeover type storehouse - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a storage unit that can switch between cold and hot operation, which switches between cooling and warming articles.

Conventionally, a vending machine is generally known as this type of storage that can switch between cold and hot operation, so this conventional vending machine will be explained with reference to FIGS. 2 and 3. Reference numeral 1 denotes a main body of a vending machine having a heat insulating material 2. The inside of the main body 1 is divided into two storage chambers 3a and sb for storing products on the left and right, each of which has a storage chamber 3a and 3b. are provided with product shelves 4a and 4b, respectively. In addition, each of the product storage chambers 3a and 3b has a first cooling chamber. Blow fans 7a and 7b are arranged to forcefully circulate cold air and warm air into the second evaporators sa and sb, the heating heaters e+a and eb, and the respective storage chambers 3a and 3b. And each room 3
The first and second evaporators 5a arranged at a and 3b
, esb are connected in series with each other, including an electric compressor 8, a capacitor 9, a solenoid valve 11, and a first capillary tube 10.
a, first evaporator 5a, second evaporator 6b
A bypass circuit 12 is formed which includes a second capillary tube 1ob which has a higher degree of pressure reduction than the first capillary tube 10a which injects the first evaporator 6a. The solenoid valve 11 is opened and closed by an electric signal based on a cold/hot operation selection switching command.

In the above configuration, when both the storage chambers 3a and 3b are in cooling operation, the solenoid valve 11 is opened, and the refrigerant from the compressor 8 and condenser 9 flows into the first capillary tube 10a and the second capillary tube 10b. I try, but
Since the degree of pressure reduction is smaller in the first capillary tube 10a and the resistance is smaller, most of the refrigerant flows from the first capillary tube 10a to the first evaporator 5a and then to the second evaporator 5b. Although the amount of the refrigerant was small, it flowed from the second capillary tube 10b to the second volator 5b, cooling both the storage chambers 3a and 3b.

Further, when the storage compartment 3a is operated for heating and the storage compartment 3b is operated for refrigerating, the solenoid valve 11 is closed, and the refrigerant does not flow to the first evaporator 6a, but only to the second evaporator 6b.
Only the storage chamber 3b is operated for cooling, and the storage chamber 3a is operated for heating by the heater 6a. If both storage chambers 3a and 3b are kept warm, the compressor 8 is stopped and both chambers 3a are heated by heaters aa and eb.

3b is operated at a high temperature.

As mentioned above, heaters 6a, 6b, compressor 8, solenoid valve 11
By selecting and energizing the storage chambers 3a and 3b,
Combinations of cold-cold, hot-cold, and warm-hot operations were obtained, and one vending machine could sell refrigerated products and hot products at the same time. However, in this refrigerant circuit, the storage chambers 3a and ab cannot be operated in combination with cold and hot operation. Another option is to arrange two evaporators in parallel in this type of refrigerant circuit, but it may be difficult to distribute the flow evenly to the two evaporators depending on the load conditions, especially if the loads are extremely different. It was difficult.

The object of the present invention is to eliminate these drawbacks and provide a refrigerant circuit for a storage unit capable of switching between cold and hot operation, and in particular, a refrigerant circuit for the storage unit, which can easily and reliably perform all combinations of cold and hot storage. That is.

An embodiment of the present invention will be described below with reference to FIG. 1. Since the cooling system is the same as the conventional one except that it is different from the conventional one, the same reference numerals will be used in the description. Compressor 8, condenser 9, first electromagnetic valve 11, first capillary tube 10a-'-1
- A first evaporator 5a.

Third capillary tube 13, second evaporator 5
b are connected in series to form a cooling system, and between the condenser 9 and the first electromagnetic valve 110 and the first evaporator 6.
a and the third capillary tube 13, the first bypass pipe 12' has a second capillary tube 10b' having a higher degree of pressure reduction than the first capillary tube 10a.
has been established. Also, between the first evaporator 6a and the third capillary tube 13 and the second evaporator 6b.
A second bypass pipe 16 having a second electromagnetic valve 14 is provided between the compressor 8 and the compressor 8 . The sum of the resistance of the third capillary tube 13 and the resistance of the second evaporator 5b is greater than the resistance of the second bypass pipe 16 having the second electromagnetic valve 14. However, when the resistance of the second evaporator 5b alone is greater than the resistance of the second bypass pipe 16, the third capillary tube 13 is not particularly required.

The cold/hot switching operation in the above configuration will be described next. When both the storage chambers 3a and ab are in cooling operation, the first solenoid valve 11 is open, the second solenoid valve 14 is closed, and the first capillary tube 10a' has a lower pressure than the second capillary tube 10b'. is small and the resistance is small, so
The amount of refrigerant flowing through the first bypass pipe 12' is extremely small.
Most of the refrigerant flows from the first capillary chirp 10a, to the first evaporator 5a, to the third capillary tube 13, to the second evaporator 6b, and to each storage chamber 3a.

Cool 3b. Next, if the chamber 3a is to be operated for heating and the chamber 3b is to be operated for refrigerating, the first. Both the second solenoid valves 11 and 14 are closed,
The refrigerant flows only to the second evaporator 5b, and the refrigerant flows to the storage chamber 3b.
Only the storage chamber 3a is operated for cooling, and the storage chamber 3a is operated for heating by the heater 6a. On the other hand, if the storage compartment 3a is to be refrigerated and the storage compartment 3b is to be heated, the first. Both the second electromagnetic valves 11 and 14 are opened, and the refrigerant flows into the second capillary tube 1ob' due to the resistance difference.Most of the refrigerant flows into the first capillary tube 10a', and the refrigerant flows into the first capillary tube 10a'. After flowing to the exhaust gas a, it passes through the second bypass circuit 16 and returns to the compressor 8. This means that the flow path to the second eno (porator 5b) is also a closed path, but the third capillary tube 1
This is because, due to the resistance of 3, it does not flow to the second evaporator tube b, but flows to the second evaporator tube 15. As a result, only the storage chamber 3a is operated for cooling, and the storage chamber 3b is operated for heating by the heater 6b. And Ryozo storage room 3A, 3
If both b are kept warm, the compressor 8 is stopped and the heaters 6a and
6b, both storage chambers 3a and 3b are operated at a high temperature.

As described above, by providing the second nozzle pass pipe having the solenoid valve 14, a combination of cold and hot operation can be performed.
It can be done easily and reliably. It's a moat, in this system, 2.
Because two evaporators are arranged in series, there is no need to worry about uneven refrigerant flow due to load imbalance that occurs when evaporators are arranged in parallel, and one vending machine can sell cold and hot products at the same time. Now I can do it.

It should be noted that the present invention is not limited to vending machines, but similar practical effects can be obtained with any cold/hot operation switching storage that has a similar cooling system, such as a cold/hot switching wet towel machine.

As described above, the storage of the present invention has two storage chambers for storing products, and an evaporator is installed in the two chambers.

By installing a heater for each and switching between cooling operation and heating operation, it is configured so that refrigerated products and heated products can be sold at the same time. A tube, a first evaporator, and a second evaporator are connected in series to form a cooling system, and a first capillary is connected between the condenser and the first solenoid valve and between the first evaporator and the second evaporator. A second electromagnetic valve is connected between the first evaporator and the second evaporator and between the second evaporator and the compressor. , and the resistance on the second evaporator side from the second bypass pipe is set as a dog, so that when the first solenoid valve and the second solenoid valve are closed, By opening the solenoid valve and the second solenoid valve, the two storage compartments can be switched between cold and hot storage and hot and cold storage.1. Each storage room can be used by switching between cold storage and hot storage. In addition, by providing a difference in the degree of pressure reduction between the first capillary tube and the second capillary tube during cold-warming storage, and by making the resistance on the second evaporator side larger than that on the second bypass pipe, the refrigerant This ensures the flow. The first one. Since the second evaporator is arranged in series, even if both storage chambers are refrigerated, there will be no imbalance in the flow of refrigerant due to the load.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram of a cooling unit of a vending machine with cold and hot switching according to an embodiment of the present invention, FIG. 2 is a front view showing the configuration of a conventional vending machine with cold and hot switching, and FIG. 2 shows a refrigerant circuit diagram of the cooling unit in FIG. 2. 3a, 3b...Storage room, 6a, 5b...
・1st゜second evaporator, 6a, 6b...
1st. Second heater, 10a'...first capillary tube, 10b'...second capillary tube, 11.14...first. second solenoid valve, 1
6...Second Nokuinox tube. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 3b / Figure 212

Claims (1)

[Claims] Two storage chambers are formed in the main body, and a first storage chamber for cooling is formed in the two storage chambers. A second evaporator, a first and second heater for heating are provided, and a compressor, a condenser, a first electromagnetic valve, a first capillary tube, the first evaporator, and the second evaporator are connected in series to form a cooling system, between the condenser and the first solenoid valve;
A first bypass pipe is provided between the first evaporator and the second evaporator via a second capillary tube having a higher degree of pressure reduction than the first capillary tube, and an outlet of the first evaporator. and the second
A second bypass pipe is provided between the outlets of the evaporator via a second solenoid valve, and the resistance on the second evaporator side is greater than that of the second bypass pipe. storage.