JPH0136033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a two-temperature refrigerator, etc., equipped with an evaporator for a freezer compartment and an evaporator for a refrigerator compartment.

Configuration of conventional example and its problems A conventional refrigerant circuit is explained with reference to Fig. 1.A high-pressure compressor a inside the outer shell supplies refrigerant to the freezer compartment through a condenser b and a pressure reducer c. It was supplied to the evaporator d and the refrigerator compartment evaporator e to cool them at the same time. The temperature inside the refrigerator is controlled by the compressor a.
This was done by turning on and off using a thermostat (not shown) installed in the refrigerator compartment.
Here, f is a check valve, and when the compressor a is stopped, the high temperature and high pressure gas in the compressor a is transferred to the freezer compartment evaporator d,
This is to prevent backflow into the evaporator e for the refrigerator compartment.

In such a refrigerant circuit, the evaporator e for the refrigerator compartment is defrosted by energizing the defrost heater g provided near the evaporator e for the refrigerator compartment when the compressor a is stopped.

However, in the current environment where the energy saving trend is increasing, the power consumption by the defrosting heater g cannot be ignored.

OBJECT 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, high-temperature, high-pressure refrigerant in the compressor is transferred to the refrigerator compartment. The purpose is to eliminate unnecessary defrosting heaters by defrosting the refrigerant using the heat released when the refrigerant is introduced into the evaporator and condensing in the refrigerator compartment evaporator.

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. 5 is a check valve that prevents the high-temperature, high-pressure refrigerant in the rotary compressor 1 from flowing back into the freezer compartment evaporator 4;
and the refrigerator compartment evaporator 6.

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. The temperature is detected by a thermostat temperature sensing section (not shown) installed on the surface of the room evaporator 6, and the rotary compressor 1 is controlled to turn ON/OFF. When the thermostat is ON, the refrigerant is supplied by the rotary compressor 1 to the evaporator 4 for the freezer compartment via the condenser 2 and pressure reducer 3, and then to the evaporator 4 for the refrigerator compartment via the check valve 5. evaporator 6 and cools both evaporators 4 and 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 this rotary compressor 1 stops, the airtightness of the high and low pressures maintained during operation is broken, and the high-temperature and 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 refrigerator compartment evaporator 6, and the heat released at this time defrosts the refrigerator compartment evaporator 6. Note that the check valve 5 prevents the high-temperature, high-pressure refrigerant from flowing back into the freezer compartment evaporator 4, and there is no fear that the freezer compartment temperature will rise due to the backflow. Then, when defrosting with the high-temperature, high-pressure refrigerant progresses and the surface temperature of the refrigerator compartment evaporator 6 reaches the set temperature, the thermostat is turned on again.
The rotary compressor 1 is turned ON, and as soon as defrosting is completed,
starts cooling operation.

As is clear from the above explanation, in this example,
The high-temperature, high-pressure refrigerant in the rotary compressor 1 is guided into the refrigerator compartment evaporator 6 for defrosting every cycle when the compressor is stopped, which saves power by eliminating the need for extra heaters, etc. The cost is affordable.

In addition, under low outside temperatures, the high temperature and high pressure backflow refrigerant
This provides an appropriate load, prevents the operating rate of the rotary compressor from dropping excessively, and prevents the freezer compartment temperature 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 in-shell high-pressure compressor to be evaporated for the refrigerator compartment when the compressor is stopped. Since the defrost is carried out by introducing the defrost into the container, there is no need for a defrosting heater as in the past, which has a significant energy saving effect.

[Brief explanation of drawings]

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.

Claims (1)

[Claims] 1 A refrigerant circuit is constructed by sequentially connecting an in-shell high-pressure type 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. Refrigeration equipment with a check valve placed between the container and the container.