JPS5952175A - Cooling device - 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 a cooling device such as a refrigerator having a plurality of cold storage chambers t having different temperatures.

Conventionally, a system in which cooling is performed using a single cooling device including a high-temperature floor and a low-temperature oven has been seen in home-use refrigerator-freezers, and the basic cooling device is shown in FIG. The operation of the conventional example will be described below with reference to FIG.

In FIG. 1, refrigerant discharged from a compressor 1 and liquefied in a condenser 2 is depressurized in a capillary tube 3 and evaporated in an evaporator 4 disposed in a low temperature storage 5. floor 6
cooling. The low-temperature refrigerator 5 is cooled by circulating air cooled by a blower 7 disposed near the evaporator 4 inside the refrigerator. On the other hand, the high-temperature cloth 6 is cooled by a portion of the air cooled by the blower TVc being supplied into the refrigerator via the thermo pump 8. The temperature of the low-temperature chamber 5 is controlled by starting and stopping the compressor 1 using a temperature regulator (not shown) installed in the low-temperature chamber 5, and the temperature of the high-concentration chamber 6 is controlled by a temperature regulator (not shown) installed near the outlet of the duct 9. This is done by adjusting the amount of cooling air supplied by a thermometer 8 which senses the temperature inside the high concentration 6.

However, in the conventional example described above, the pressure of the evaporator 4 depends on the temperature of the low temperature storage 5, so the coefficient of performance of the compressor 1 is a very small value, resulting in an inefficient operation as a cooling device. Ta. In addition, the evaporator 4 that cools the highly concentrated 6
Since the temperature is low enough to match the temperature of the low-temperature refrigerator 5, the inside of the high-concentration chamber 6 becomes too dry, resulting in frequent frost formation on the evaporator 4 (which has the disadvantage of requiring frequent defrosting).

The purpose of this invention is to improve the drawbacks of the conventional system by operating each of the low temperature and high temperature systems independently. Hereinafter, this invention will be explained with reference to the drawings.

FIGS. 2 and 3 are a schematic configuration diagram and a block diagram of an operation control circuit showing an embodiment of the present invention.

In FIG. 2, 11 is a compressor, 12 is a first condenser, 1
3 is a check valve, 14 is a second condenser, 15° 16 is a refrigerant flow path switching high-temperature system solenoid valve and low-temperature system solenoid valve, 1T is a high-temperature system capillary tube, which is a high-temperature system installed in the high-concentration 19. It communicates with the evaporator 18 and is arranged between the high temperature system solenoid valve 15. 20 is a low-temperature system capillary tube, which communicates with a low-temperature evaporator 21 disposed in a low-temperature storage 22 and is disposed between a low-temperature system solenoid valve 16. 23 is a check valve.

FIG. 3 is a block diagram of an operation control circuit for explaining the operation method of the present invention, and 31 and 32 are the high concentration 19 and 32, respectively. Temperature detection terminals 33 and 34 that detect the internal temperature of the low-temperature refrigerator 22 output ON signals from room temperature to the lower limit set value, and also output off signals up to the lower limit set value J, 9 and the upper limit set value. The first one for the low temperature storage 22. Second
temperature controller, 35 is an AND gate established by the off signal of the temperature controller 33 and the temperature controller 340 on signal, and 36 is established by either the ANDN-gate 0 on signal or the temperature controller 330 on signal. The OR gate 37 is a timer that outputs an ON signal after a certain predetermined time from the ON signal of the AND gate 35.

11.15.16 are the same as shown in FIG. That is, the compressor 11 is driven by the output of the OR gate 36, the high temperature system solenoid valve 15 opens when the temperature controller 330 turns on, and the low temperature system solenoid valve 16 opens when the timer 370 turns on.

When the temperature inside the high concentration 19 detected by the temperature detection end 31 is higher than the lower limit set value, the temperature controller 33 outputs an on signal, and the high temperature system solenoid valve 15 and compressor 11 are thereby operated. The refrigerant discharged from the compressor 11 is transferred to the first condenser 12. Check valve 13° Second condenser 14. High temperature system solenoid valve 15. High temperature system capillary tube 17. High temperature evaporator 18. Compressor 1
1 and performs a high concentration 19 cooling operation.

In addition, since the low temperature system solenoid valve 16 is an AND gate 35,
When the temperature inside the low-temperature storage 22 is high (it remains closed even when the ON signal is output from the temperature controller 34, the refrigerant circuit of the low-temperature system is separated from the high-temperature system by the low-temperature system solenoid valve 16 and the check valve 231C). Ru.

Now, when the high temperature w, 19 is cooled and reaches the lower limit set value,
The temperature controller 33 outputs an off signal, and the high temperature system solenoid valve 1
5 closes 1. At this time, if the temperature of the low-temperature refrigerator 22 is high and the temperature controller 34 also outputs an ON signal, the AND gate 35 is established. As a result, the OR gate 36 continues to be established, so the compressor 11 continues to operate.

On the other hand, when the AND gate 35 is established, the timer 31 starts measuring time, but until a certain time, the low temperature system solenoid valve 16 remains closed because it outputs an off signal. The refrigerant discharged from the compressor 11 from this trap is transferred to the first condenser 12.
It is condensed in the second condenser 14 and accumulated in each condenser. If low-temperature system operation and high-temperature system operation are performed with the same amount of refrigerant, there will be an excess of refrigerant during low-temperature system operation, causing phenomena such as liquid banks. In the present invention, excess refrigerant is accumulated in the second condenser 14 by the delay operation of the timer 3T described above at the start of low-temperature system operation. When the predetermined period of time has elapsed and the timer 37 outputs an on signal, the low temperature system solenoid valve 16 becomes open, and the refrigerant flows from the first condenser 12 to the low temperature system solenoid valve 16. Low temperature system capillary 20. Flows to low temperature evaporator 21, check valve 23, and low temperature storage 2
Start the second refrigerant operation.

On the other hand, the refrigerant accumulated in the second condenser 14 is removed by the check valve 13.
．． The high temperature system solenoid valve 15 causes the water to accumulate as it is. In other words, the amount of refrigerant was adjusted appropriately and the high temperature system operation was switched to the low temperature system operation.

Further, when the temperature of the high-temperature bed 19 reaches the upper limit set value again during the cooling operation of the low-temperature storage 22, the operation is switched to the high-temperature bed 19 as described above. When both chamber temperatures are below the lower limit set value, the temperature controllers 33 and 34 output an off signal, both solenoid valves 15 and 16 close, and the compressor 11
stops.

This invention switches the evaporator for each low-temperature and high-temperature system,
Switch the condenser size t and operate it independently, high temperature bed 19
By maintaining a high evaporation temperature when cooling the compressor 11, it improves the performance efficiency of the compressor 11, improves the operating efficiency of the cooling device, and has the function of appropriately adjusting the amount of refrigerant. Therefore, when this invention is applied to a household refrigerator-freezer, the cooling load ratio is about 4:6, and the load on the refrigerator (high temperature bed) is heavy (the coefficient of performance of the compressor 11 is about 1:2 to 2.5). Since the refrigerator compartment is large, power consumption can be reduced by approximately several tens of percent.

In the above embodiment, the high-temperature system operation with good operational efficiency is mainly performed, and the low-temperature system operation is performed as a secondary operation, but it goes without saying that the reverse may be used. Also,
Although the above embodiment has been described with respect to a case where there are two load systems, it is clear that the present invention can be easily applied to loads with a larger number of systems.

Furthermore, in the above embodiment, the case where the capillary tubes 17 and 20' of the high-temperature system and the low-temperature system are used as a pressure reducer was described, but it goes without saying that an expansion valve or the like may also be used. High temperature system, low temperature system solenoid valve 15
．． 16 (although a three-way valve may be provided at the refrigerant branch to the high-temperature evaporator 18 and the low-temperature evaporator 21).

As explained in detail above, this invention distributes refrigerant to evaporators with different evaporation attachments in chronological order and switches the size of the condenser, thereby increasing the operating efficiency of the compressor and cooling device. In addition, it is possible to independently control the internal temperature of each refrigerator.In addition, when cooling the low-temperature system, a timer is used to delay the start of cooling, and the refrigerant is stored in the second condenser. It has the advantage that it will not become excessive.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the configuration of an example of a conventional cooling device, Fig. 2 is a schematic diagram of the configuration of an embodiment of the present invention, and Fig. 3 is a block diagram of the operation control circuit of the embodiment of Fig. 2. In the figure, 11 is a compressor, 12 is a first condenser, 13 is a check valve, 14 is a second condenser, 15 is a high temperature system solenoid valve, 16 is a low temperature system solenoid valve, and 17 is a high temperature system capillary. , 18 is a high-temperature evaporator, 19 is a high-temperature bed, 20 is a low-temperature system capillary, 21d is a low-temperature evaporator, 22 is a low-temperature storage, 23 is a check valve, 31.32 is a temperature detection end, 33.34 is the first. 2 temperature controller, 35
is an AND gate, 36 is an OR gate, and 37 is a timer. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) Figure 1 5 Figure 2 Figure 3

Claims (1)

[Claims] A cooling system in which a high-temperature bed and a low-temperature storage are provided with a high-temperature evaporator and a low-temperature evaporator, respectively, and the refrigerant from the compressor is passed through the high-temperature evaporator and the low-temperature evaporator via a first condenser. In the device,
A check valve, a second condenser, and a high-temperature system opening/closing valve are provided between the first condenser and the high-temperature evaporator. and a high-temperature system pressure reducer are provided in sequence, a low-temperature system on-off valve and a low-temperature system pressure reducer are provided between the first condenser and the low-temperature evaporator, and a reverse pressure is provided between both downstream of the low-temperature evaporator and the high-temperature evaporator. A first temperature controller that includes an upper valve and senses the temperature inside the high-temperature refrigerator and outputs an on/off signal, and a second temperature controller that senses the temperature inside the low-temperature refrigerator and outputs an on/off signal. an AND gate established by the off or on signal of the first temperature controller and the on or off signal of the second temperature controller, the on signal of the AND gate and the first temperature control; an OR gate established by any of the ON signals of the AND gate, and a timer that outputs an ON signal after a predetermined time from the ON signal of the AND gate,
an output of the OR gate is connected to the compressor;
An output of the temperature controller is connected to the high-temperature system on-off valve, and an output of the timer is connected to the low-temperature system on-off valve.