JPS5952173A - 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 configuration in which both a high-temperature and a low-temperature compartment 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, the refrigerant discharged from the compressor 1 and liquefied in the υC compressor 2 is depressurized in the capillary tube 3 and evaporated in the evaporator 4 disposed in the low temperature storage 5. Cooling is performed at high temperature and thickness 6. The low-temperature refrigerator 5 is cooled by circulating air cooled by a blower 1 disposed near the evaporator 4 inside the refrigerator. On the other hand, the high temperature thickness 6 is cooled by a part of the air cooled by the blower 1 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-temperature thickness 6 is controlled by a temperature regulator (not shown) installed near the outlet of the duct 9σ. Thermal damper 8 detects the temperature inside the high-temperature bed 6
This is done by adjusting the amount of cooling air supplied.

However, in the conventional example as described above, since the pressure of the evaporator 4 depends on the temperature of the low temperature storage 5, the coefficient of performance of the compressor 1 is a very small °C value, and there is no inefficient operation as a cooling device. was. In addition, since the temperature of the evaporator 4 that cools the high temperature thickness 6 becomes a low temperature commensurate with the low temperature storage 5,
There were drawbacks such as the inside of the high-temperature bed 6 becoming excessively dry and frost forming on the evaporator 4 increasing, necessitating 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 show an embodiment of the present invention.

It is a schematic diagram and a Glock diagram of an operation control circuit.

In FIG. 2, 11 is a compressor, 12 is a 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 disposed in the high temperature cloth 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. 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 temperature thicknesses 19 and 32, respectively. A temperature detection terminal 33.34 detects the internal temperature of the low temperature refrigerator 22, and a high temperature thickness 19 and a low temperature refrigerator output an ON signal from room temperature to a lower limit setting value, and outputs an OFF signal from the lower limit setting value to an upper limit setting value. 1st for 22. A second temperature controller 35 is an AND result formed 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 35σ) or the ON signal of the temperature controller 33.

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 ON signal from the temperature controller 33. Low temperature system solenoid valve 16 is ANDN-gate 0
Performs opening operation with ON signal.

When the temperature inside the high temperature cloth 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 the compressor 11 operate. . The refrigerant discharged from the compressor 11 is transferred to the first condenser 12. Check valve 13° 21st! , compressor 14. High temperature system solenoid valve 15. High temperature system capillary tube 17. It flows through the high temperature evaporator 1B and the compressor 11, and performs a cooling operation with a high temperature thickness 19.

In addition, since the low temperature system solenoid valve 16 is an AND gate 35,
The temperature inside the low-temperature refrigerator 22 is high, and even if the ON signal is output from the temperature controller 34, it remains closed, and the refrigerant circuit of the low-temperature system is separated from the high-temperature system by the low-temperature system solenoid valve 16 and check valve 23. .

Now, when the high temperature 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 AN'D gate 3
5 is established, and the low temperature system solenoid valve 16 is opened. Also,
As a result, the OR gate 36 continues to be established, so the compressor 11 continues to operate, and the refrigerant is transferred to the condenser 12. Low temperature system solenoid valve 16. Low temperature system capillary 20. The low temperature evaporator 21 flows through the check valve 23, and the cooling operation of the low temperature storage 22 is started. In other words, the system has switched from high-temperature system operation to low-temperature system operation.

In addition, if the temperature of the high temperature thickness 19 reaches the upper limit setting value again during the cooling operation of the low temperature refrigerator 22, the above-mentioned 5
The operation is switched to high temperature thickness 19.

High temperature bed19. When the internal temperature of both low-temperature refrigerators 22 falls below the lower limit set value, the temperature controllers 33, 34 output an off signal, both electromagnetic valves 15, 16 close, and the compressor 11 stops.

Generally, as the evaporation temperature increases, the number of refrigerant circulation members increases.
If we look at the same condenser, it will not completely liquefy and the operating efficiency of the cooling system will deteriorate. Therefore, when the evaporation temperature is high, it is necessary to make the lid open larger than when the lid is opened at a low temperature.In the case of this invention, only the first condenser 12 is used during low temperature system operation, and this In addition to the condenser 12, a second condenser 14 operates to improve the operating efficiency of the cooling system for the high temperature system.In other words, the present invention switches the evaporator for each of the low temperature and high temperature systems, and changes the size of the condenser. Switch and operate independently, high temperature bed 1
By maintaining the high temperature evaporation temperature when cooling the compressor 9, the performance efficiency of the compressor 11 is improved, and the operating efficiency of the cooling device is improved. Therefore, when this invention is applied to a household refrigerator-freezer, the cooling load ratio is 4:6.
The load on the refrigerator (high-temperature floor) is large, the coefficient of performance of the compressor 11 is about 1:2 to 2.5, and the refrigerator compartment is large, so power savings of about several tens of centimeters can be achieved.

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.

Further, in the above embodiment, the case was described in which the capillary tubes 17 and 2 of the high temperature system and the low part system were used as the pressure reducer, but it goes without saying that an expansion valve or the like may be used.
In addition, the refrigerant on-off valve is also the solenoid valve 15 for the still temperature system and the low temperature system.
16, a three-way valve may be provided at the refrigerant branch to the high temperature evaporator 1B 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, it has the advantage of being able to independently control the temperature inside each refrigerator.

[Brief explanation of drawings]

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 condensate, 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 is a high-temperature bed, 2o is a low-temperature system capillary, 21 is a low-temperature evaporator, 22 is a low-temperature chamber, 23 is a check valve, 31.32 is a coating detection end, 33° 34 is a temperature controller, 35 is an AND gate, and 36 is a zero field gate. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - (1 other person) Figure 1 et al.

Claims (1)

[Claims of Claims] A cooling system in which a high-temperature evaporator and a low-temperature evaporator are provided in the high-temperature tank and the low-temperature storage, 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 between the downstream of the low-temperature evaporator and the high-temperature evaporator. A check valve is installed to sense the temperature inside the high temperature chamber and turn it on.
A first temperature controller that outputs an OFF signal and a second temperature controller that senses the temperature inside the low temperature refrigerator and outputs an ON/OFF signal are provided, and further, the first temperature controller An AND gate is established between the OFF or ON signal and the OFF signal of the second temperature controller, and an OR gate is established between the ON signal of this AND gate and the ON signal of the first temperature controller. Provided. The output of the OR gate is connected to the tail of the compressor, and
An output of the temperature controller is connected to the high temperature system on-off valve, and an output of the AND gate is connected to the low temperature system on-off valve.