JPS5952170A - 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 having different temperatures.

Conventionally, a system in which a high-concentration and a low-temperature storage are cooled by a single cooling device has been seen in household refrigerator-freezers, etc., 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. Rich 6
Perform cooling. The low-temperature refrigerator 5 is cooled by circulating air cooled by a blower IK disposed near the evaporator 4 inside the refrigerator. On the other hand, a portion of the air cooled by the blower 7 is supplied to the high-temperature floor 6 into the refrigerator via the thermo pump 8 and is cooled. 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-temperature thickness 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 that senses the temperature within the high temperature thickness 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. Also, an evaporator 4 that cools the high temperature thickness 6
Since the temperature is low enough to match the temperature of the low-temperature storage 5, the inside of the high-temperature thickness 6 becomes excessively dry, resulting in a large amount of silk deposited on the evaporator 4, which requires 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. The present invention will be explained below 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° and 16 are a high temperature system solenoid valve and a low temperature system solenoid valve that switch the refrigerant flow path, 17 is a high temperature system capillary tube, and a high temperature evaporator installed in the high temperature thickness 19. The high temperature system solenoid valve 15 communicates with the high temperature system electromagnetic 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. The discharge pipes of the high-temperature evaporator 18 and the low-temperature evaporator 21 are arranged independently, and are connected to the suction pipe in the vicinity of the compressor 11.

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 temperature thicknesses 19 and 32, respectively. Temperature detection terminals 33 and 34 detect the internal temperature of the low-temperature chamber 22, which outputs an on signal from room temperature to the lower limit set value, and outputs an off signal from the lower limit set value to the upper limit set value. 1st for 22. A second temperature controller 35 is an AND gate established by the off signal of the temperature controller 33 and the on signal of the temperature controller 340;
36 is an OR gate that is established by either the ON signal of the AND gate 35 or the ON signal of the temperature controller 330.

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, and the high temperature system solenoid valve 15 is opened by the temperature controller 330 ON signal. Low temperature system solenoid valve 16 is ANDN-gate 0
Performs opening operation with ON signal.

When the temperature within the high temperature thickness 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 from this K the high temperature system solenoid valve 15 and compressor 11 operate. . 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 cooling operation with high temperature thickness 19 5° Also, 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 if an 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. Since the discharge pipe of the evaporator 21 is arranged independently up to the vicinity of the suction of the compressor 11, the refrigerant that has become a gas in the high-temperature evaporator 1B does not flow to the low-temperature evaporator 21. When the thickness 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 15
is closed. At this time, if the temperature of the low-temperature refrigerator 22 is high and the ON signal is output from the temperature controller 34, the AND gate 35
holds true. As a result, the OR gate 36 continues to hold true, so the compressor 11 continues to operate. AND gate 35
When the low temperature system solenoid valve 16 is established, 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. It flows to the low-temperature evaporator 21 and starts the cooling operation of the low-temperature storage 22.

Further, when the temperature of the high-temperature bed 19 reaches the upper limit setting value again during the cooling operation of the low-temperature storage 22 and the cooling operation is performed, the operation of the high-temperature bed 19 is switched to as described in 5 above.

High temperature thickness 19. When the internal temperature of both low-temperature refrigerators 22 falls below the lower limit set value, the temperature controllers 33 and 34 output an off signal, both electromagnetic valves 15 and 16 close, and the compressor 11 stops.

Generally, as the evaporation temperature increases, the amount of refrigerant circulating increases.
If we look at the same condenser, it will not completely liquefy and the operation efficiency of the cooling system will be poor.Therefore, in the case of high evaporation temperature, it is necessary to increase the evaporation temperature compared to low evaporation temperature.In the case of this invention, when operating the low temperature system, , only the first condenser 12 is used, and when the high temperature system is operating, the second condenser 14 is operated in addition to the first condenser 12, improving the operating efficiency of the cooling device for the high temperature system. When applied to a household refrigerator-freezer in which the load ratio is about 4:6 and the high-temperature floor (refrigerator) 19 has a large load, power savings of several tens of times can be achieved.

In the above embodiment, the high temperature system operation with good operational efficiency is mainly operated, and the low temperature system operation is operated as a secondary operation, but it is of course possible to do the opposite. 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 was described in which the capillary tubes 17 and 20 of the high temperature system and the low temperature system were used as the pressure reducer, but it goes without saying that an expansion valve or the like may also be used. System, low temperature system solenoid valve 15.1
6, 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 temperatures in time series, and also switches the size of the condenser, thereby greatly increasing the operating efficiency of the compressor and cooling device. In addition, there is an advantage that the internal temperature of each refrigerator can be controlled independently.

[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. 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, 17 is a high temperature system capillary, 18 is a High temperature evaporator, 19 high temperature bed, 20 low temperature system capillary, 21 low temperature evaporator, 22 low temperature storage, 31.32 temperature detection end, 33
．． 34 is a first and second temperature controller, 35 is an AND gate, and 36 is an OR gate. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - (1 other person) Figure 1

Claims (1)

[Claims] Cooling in which the high-concentration and low-temperature storages each include a high-temperature evaporator and a low-temperature evaporator, 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, and 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 the temperature in the high-temperature chamber is sensed and an on/off signal is output. a first temperature controller that senses the temperature inside the low-temperature refrigerator and outputs an on/off signal; and an AND gate established by the ON or OFF signal of the second temperature controller, and an OR gate established by either the ON signal of the AND gate and the ON signal of the first temperature controller, and the OR gate The output of the first temperature controller is connected to the high-temperature system on-off valve pressure, the output of the AND gate is connected to the low-temperature system on-off valve, and the high-temperature evaporator and A cooling device characterized in that the discharge pipes of the low-temperature evaporators are individually arranged and connected in the vicinity of the suction pipe of the compressor.