JPH0244177A - Cooling and heating changeover type storage room - Google Patents

Abstract

PURPOSE:To adjust a capability of a compressor during a cooling- cooling operation and a cooling-heating operation without changing a capacity of a condensor by a method wherein each of evaporators mounted in two chambers is connected to the compressor through a three-way valve and at the same time a piping directly connecting the evaporator for always performing a cooling operation to the compressor is provided. CONSTITUTION:In case of a cooling- cooling operation, a compressor 7 and a blower fan 12 are controlled for their operation by a temperature adjuster 13a. A chamber 4a is operated to cool in synchronous with an operation of the compressor 7 and a coil 25 of a three-way valve is energized only when both first temperature adjuster 13a and second temperature adjuster 13b are kept in their ON state, so that refrigerant is made to flow to a second evaporator and a chamber 4b is operated to cool. In case of performing a cooling-heating operation, a heating heater 15 is energized and a heating of the chamber 4b is controlled with a temperature adjuster 16. A first evaporator 5a is connected to the compressor 7 and also a second evaporator 5b is directly connected to the compressor 7, so that a suction resistance of the compressor 7 can be performed, a phenomenon of a lack of gas caused by a variation of load of the compressor can be eliminated and then a stable operation of a cooling system can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cold-temperature switching type storage for use in vending machines and the like, and particularly relates to improvements in the refrigeration system thereof.

2. Prior Art As a conventional example, Fig. 4 shows a vending machine that stores and sells products by switching between cold and hot storage with multiple evaporators, one for cooling and one for storing and heating products. , will be explained with reference to FIG.

Reference numeral 1 denotes the main body of the storage consisting of a heat insulating box 2;
Inside, there are two storage compartments 4a and 4 on the left and right by a heat insulating partition wall 3.
b (hereinafter referred to as chambers). Each room 4a, 4b
have first and second evaporators 5 for cooling, respectively.
Air blowers 8a, 6b for forced circulation of a, esb and cold air
is located.

The first... The second evaporators 5a, sb are connected in parallel with each other, the compressor 7, the capacitor 81, the second electromagnetic valve 10&, 10b, the first solenoid valve 10&, Second pressure reducer 11a
, 1 l b, 1st. Second evaporator 5a.

6b to form a cooling system.

Further, the condenser 8 is an air-cooled condenser that is cooled by air blowing by a blowing fan 12 . 13a.

13b is a first chamber which controls the temperature of each chamber 4a, 4b to an arbitrary temperature. With the second temperature controller, the first temperature controller. Second temperature regulator 1
temperature sensitive part 14a of sa, 13b.

14b is attached to the eleventh and second evaporators 5a and 5b for heat exchange. 1st. Second solenoid valve 1oa, 1o
b is the flow divider 9 and the first. The second pressure reducers 11a and 11b are respectively provided between the first and second pressure reducers 11a and 11b. By the ON-OFF command of the second temperature regulators 13a and 13b,
Open and close the refrigerant circuit.

Reference numeral 16 denotes a heater which is controlled and operated by the temperature regulator 16.

Next, the electric circuit will be explained. Compressor 7 and blower fan 12. The first solenoid valve 10a is connected in series to the power supply 17 via the first temperature regulator 13&, the second temperature regulator 13b and the second solenoid valve 10b are connected in series, and the first
It is connected to a power source 17 via a temperature regulator 13a and one contact of a changeover switch 18. The overheating heater 15 is connected to a power source 17 via a temperature regulator 16 and the other contact of a changeover switch 18. Blow fan 8a.

6b are each directly connected to the power source 17.

In the above configuration, when both chambers 4a and 4b are in cooling operation (hereinafter referred to as cold-cold operation), the switching switch 18 is set to C.
By switching to the o1d side, the first temperature regulator 13
Compressor 7. Blow fan 12. The first solenoid valve 10a is operated in a controlled manner, and the first temperature regulator 13a
The second electromagnetic valve 10b is operated under control by the second temperature regulator 13b, and the respective chambers 4a and 4b are operated for cooling.

In addition, when the chamber 4a is cooled and the chamber 4b is heated (hereinafter referred to as cold-hot operation), by switching the changeover switch 18 to the Hot side, the heating heater 15 is energized and the temperature controller 16 is turned on. Accordingly, chamber 4b is operated with heating control, and chamber 4b
A is operated for cooling in the same manner as in the cold-cold case. As described above, by selecting and energizing the second solenoid valve 10b and the heating heater 16, the p chambers 4a and ab can have cold-cold and cold-warm combinations, and can be used in - vending machines. It was possible to sell cold and hot products at the same time.

Problem to be Solved by the Invention However, in the above configuration, the load on the compressor 7 is reduced in cold-to-temperature operation compared to cold-to-cold operation, so if the system is designed based on cold-to-cold operation, the cold-to-temperature Gas shortage occurs during operation.

Additionally, because two solenoid valves were used to control the refrigerant circuit, the piping became complicated.

Therefore, in view of the above problems, the present invention aims to adjust the compressor capacity during cold-cold operation and cold-hot operation without changing the capacity of the condenser, and to obtain a simple piping cooling system. be.

Means for Solving the Problems In order to solve the above problems, the present invention provides piping in which the evaporators installed in two chambers are each connected to a compressor via a three-way valve, and the evaporator on the side that performs constant cooling is directly connected to the compressor. It has the following.

Function The present invention has the above-described configuration, and when it is desired to cool both chambers,
The evaporator in the chamber that is in constant cooling operation is directly connected to the compressor, and the evaporator in the other chamber is connected to the compressor via a three-way valve to flow refrigerant to the evaporators in both chambers to cool both chambers. When operating with one chamber cooled and the other heated, the evaporator of the chamber that is constantly being cooled is connected directly to the compressor and also connected to the compressor through a three-way valve, which reduces the suction resistance of the compressor. This eliminates the gas shortage phenomenon caused by compressor load fluctuations and enables stable cooling system operation.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings, but the same parts as those of the conventional example will be given the same numbers and detailed explanation will be omitted.

In Figure 1, 19 is a three-way valve with port 20.2122 connected to 3
It has one. In FIG. 2, the port 2° is the first evaporator 6a, the port 21 is the second evaporator 6b, and the port 2 is the first evaporator 6a.
2 is connected to the compressor 7 through a pipe 23. Also,
The first evaporator 5a is also directly connected to the compressor T by a pipe 24 without going through the three-way valve 1e. Figure 3 shows
In the electrical circuit diagram of this embodiment, the three-way valve Koi/L/25 is connected to a power source 17 via a cold/hot changeover switch 18, a first temperature regulator 13a, and a second temperature regulator 13b.

Regarding the vending machine configured as above, the following is the first part.
The operation will be explained with reference to FIGS.

During the cold-cold operation, the operation of the compressor 7 and the blower fan 12 are controlled by the first temperature controller 13a by operating the changeover switch 18 shown in FIG. Cooling in synchronization with three-way valve carp/L'2
5 is a first temperature regulator 13a, a second temperature regulator 13b
Since both are energized only when they are in the normal state, the refrigerant is allowed to flow through the second evaporator and the chamber 4b is operated for cooling.

During the cold-hot operation, by operating the changeover switch 18, the heater 15 is energized and the temperature controller 16 controls the heating of the chamber 4b. The chamber 4a is operated for cooling in the same manner as during the cold-cold operation, but at this time, the first evaporator 5a is
The three-way valve 19 t is connected to the compression state through the piping 23, and at the same time is directly connected to the compressor 7 through the piping 24 without going through the three-way valve 19, so unlike during cold-cold operation, the suction resistance of the compressor 7 can be reduced. This eliminates the gas shortage phenomenon caused by compressor load fluctuations and enables stable cooling system operation.

As described above, according to this embodiment, by using a three-way valve in the cold-hot switching device, the piping can be simplified, and the phenomenon of gas shortage due to compressor load fluctuations can be eliminated, making it possible to operate the cooling system stably. It is something.

Effects of the Invention As described above, according to the present invention, a three-way valve is used for the cold-hot switching device, and the other equipment configuration is the same as the conventional one, so that during the cold-cold operation, the same operating state as before is maintained, and the cooling is maintained. - During hot operation, the evaporator and compressor are connected by piping that goes through the three-way valve and piping that does not go through the three-way valve, thereby reducing pressure loss due to the piping, eliminating gas shortage phenomena caused by compressor load fluctuations, and stabilizing the system. This makes it possible to operate the cooling system in a controlled manner. Furthermore, by arranging the three-way valve on the low pressure side, a very simple piping configuration can be achieved.

[Brief explanation of the drawing]

4 is a sectional view of a conventional vending machine, and FIG. 5 is a diagram of the same electric circuit. 4a, 4b... 1st. Second storage room, Ryo・
...Compressor, 8...Capacitor,
10a, 10b... 1st. second solenoid valve, 11
a, 11b...first, second pressure reducer, 12...
...Blower fan, 18...Selector switch,
19... Three-way valve, 23, 24... Piping, 26... Three-way valve. Name of agent: Patent attorney Shigetaka Awano 11 or 1 person 1
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Claims (1)

[Claims] a plurality of storage chambers provided in the main body; an evaporator provided in each of at least two of the storage chambers; a blower fan that sends air to the evaporator; a blower fan that sends air to the compressor and the condenser; a flow divider; a cooling system in which a plurality of pressure reducers, a plurality of evaporator three-way valves are sequentially connected, a plurality of temperature regulators for detecting evaporator temperatures, and a heating heater provided in at least one or each of the chambers; A storage unit that can switch between cold and hot storage, equipped with a switch that switches between cold storage and hot storage.