JPS6033456A - Refrigerator - 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 Field of Industrial Application The present invention comprises an evaporator for a freezer compartment and an evaporator for a refrigerator compartment.
Regarding 2-temperature refrigerators, etc.

The structure of a conventional example and its problems A conventional refrigerant circuit will be explained with reference to FIG.
It was supplied to the evaporator d for the freezer compartment and the evaporator e for the refrigerator compartment to cool them simultaneously.

The temperature inside the refrigerator is controlled by controlling the compressor a to ○N10F using a thermostat (not shown) installed in the refrigerator compartment.
F t, it was something to do. Here, f is a check valve that prevents high-temperature, high-pressure gas in the compressor a from flowing back into the evaporator d1 for the freezer compartment and the evaporator e for the refrigerator compartment when the compressor a is stopped. It is.

In such a refrigerant circuit, defrosting of the refrigerator compartment evaporator e is as follows:
When the compressor a is stopped, the defrost heater q installed near the refrigerator compartment evaporator e is energized to defrost the air. The power consumption by this defrosting heater q cannot be ignored.

OBJECTS OF THE INVENTION An object of the present invention is to save power by eliminating the need for a defrosting heater when the compressor is stopped, which is a drawback of the conventional example.

Structure of the Invention In order to achieve this object, the present invention provides a check valve between the evaporator for the freezer compartment and the evaporator for the refrigerator compartment, and when the compressor is stopped,
The high-temperature, high-pressure refrigerant in the compressor is led to a refrigerator compartment evaporator, and defrosting is performed using the heat released when the refrigerant is condensed in the refrigerator compartment evaporator, thereby eliminating unnecessary defrosting heaters. It is something to do.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In the figure, 1 is a rotary compressor (high pressure type in an outer shell), 2 is a condenser, 3 is a pressure reducer, and 4 is an evaporator for the freezer compartment. 6 is a check valve that prevents the high temperature and high pressure refrigerant in the rotary compressor 1 from flowing back into the freezer compartment evaporator 4;
It is installed between the evaporator 4 for the freezer compartment and the evaporator 6 for the refrigerator compartment.

The operation in such a configuration will be explained. The temperature inside the refrigerator is controlled by a thermostat (not shown) installed in the refrigerator compartment, but the correlation between the refrigerator compartment temperature and the temperature of the refrigerator compartment evaporator 6 is known in advance, and the refrigerator compartment temperature is controlled by a thermostat (not shown) installed in the refrigerator compartment. It is detected by a thermostatic temperature sensing section (not shown) installed on the surface of the evaporator 6, and the rotary compressor 1 is controlled to 0N10FF. When the thermostat is turned on, the refrigerant is transferred to the condenser 2 by the rotary compressor 1. It is supplied to the evaporator 4 for the freezer compartment via the pressure reducer 3, and further supplied to the evaporator 6 for the refrigerator compartment via the check valve 5, thereby cooling these evaporators 4, 6.

Further, when the temperature sensing portion of the thermostat becomes lower than the set temperature, the thermostat is turned off and the rotary compressor 1 is stopped. When the rotary compressor 1 stops, the airtightness of the high and low pressures maintained during operation is broken, and the high-temperature, high-pressure refrigerant in the outer shell flows back into the low-pressure side, that is, into the refrigerator compartment evaporator 6. . The high-temperature, high-pressure refrigerant that flows backward is sequentially condensed in the evaporator 6 for the refrigerator compartment, and the heat released at this time defrosts the evaporator 6 for the refrigerator compartment. This prevents the high-temperature, high-pressure refrigerant from flowing back into the freezer compartment evaporator 4, and there is no risk of the freezer compartment temperature rising due to backflow. When the surface temperature of 6 reaches the set temperature,
When the thermostat is turned on and defrosting is completed, the rotary compressor 1 starts cooling operation.

As is clear from the above description, in this embodiment, 6. the high-temperature, high-pressure refrigerant in the single-rotation compressor 1 is guided into the refrigerator compartment evaporator 6 every cycle to perform defrosting when the compressor is stopped. This means that there is no need for extra heaters, etc., and power costs can be saved.

Furthermore, under low outside temperatures, the high temperature and high pressure backflow refrigerant becomes an appropriate load, which prevents the operating rate of the rotary compressor from extremely decreasing and prevents the temperature of the freezer compartment from rising.

Effects of the Invention The present invention provides a check valve between the evaporator for the freezer compartment and the evaporator for the refrigerator compartment, and allows the high-temperature, high-pressure refrigerant of the high-pressure compressor in the shell to be evaporated for the refrigerator compartment when the compressor is stopped. Since it defrosts the frost by introducing it into the container, there is no need for a heater for defrosting as in the past, which has a great effect on energy saving.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram of a conventional example, and FIG. 2 is a refrigerant circuit diagram of a refrigeration system showing an embodiment of the present invention. 1...Rotary compressor, 2...Condenser,
3... Pressure reducer, 4... Evaporator for freezer compartment, 5... Check valve, 6 -... Evaporator for refrigerator compartment. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure C Figure 2

Claims (1)

[Claims] A refrigerant circuit is constructed by sequentially connecting an in-shell high-pressure compressor, a condenser, a pressure reducer, an evaporator for the freezer compartment, and an evaporator for the refrigerator compartment, and the evaporator for the freezer compartment and the evaporator for the refrigerator compartment are connected in sequence. A refrigeration system with a check valve placed between the