JPS6082758A - 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 the Invention The present invention relates to a refrigeration system, such as a two-temperature refrigerator, equipped with an evaporator for a freezer compartment and an evaporator for a refrigerator compartment.

Structure of conventional example and its problems As shown in Fig. 1, the refrigerant circuit of a conventional general two-temperature refrigerator transfers refrigerant from compressor a to condenser b and capillary tube C.
The compressor a is supplied to the freezer compartment evaporator d and the refrigerator compartment evaporator e to cool them simultaneously. It is for controlling. Here, if the compressor a is an external high-pressure type in a beige shell, when the compressor a is stopped, the compressor a
Since the high-temperature, high-pressure gas inside flows back into the evaporator d for the freezer compartment and the evaporator a for the refrigerator compartment, a check valve f is installed between the suction line q and the compressor a to prevent this. . Similarly, i is a solenoid valve that cuts off high-temperature, high-pressure gas when compressor a is stopped.

In such a refrigerant circuit, defrosting of the refrigerator compartment evaporator e is generally performed every cycle when the compressor a is stopped, and conventionally, the defrosting of the refrigerator compartment evaporator e is performed in the vicinity of the refrigerator compartment evaporator. The heater h was used to defrost the air every cycle when the compressor a was stopped.

However, in the current environment where energy conservation is becoming more and more oriented, the power consumption by the heater h can no longer be ignored. Furthermore, the rise in temperature inside the refrigerator due to the energization of the heater h could not be ignored.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to reduce the power consumption of the defrosting heater when the compressor is stopped and to prevent the temperature inside the refrigerator from rising too high, which are the drawbacks of the conventional example.

3. (Constitution of the Invention In order to achieve this object, the present invention provides a check valve in the middle of the evaporator for a refrigerator compartment, and when the compressor is stopped, the high-temperature, high-pressure refrigerant inside the compressor is diverted to the downstream side of the evaporator. lead to the evaporator part for the refrigerator compartment,
Defrosting is performed using the amount of heat released when the refrigerant condenses in the refrigerator compartment evaporator, and the defrosting heater of the refrigerator compartment evaporator is eliminated to reduce power consumption and to reduce the temperature of the refrigerator compartment evaporator. It is also possible to optimize the position of the check valve.

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

In Fig. 2, 1 is a rotary compressor (high-pressure compressor in the outer shell), 2 is a condenser, 3 is a capillary tube, 4 is an evaporator for the freezer compartment,
6 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 upstream of the refrigerator compartment evaporator 6, that is, to the refrigerator compartment upstream evaporator 6a to be described later. can be,
This is installed in the middle of the refrigerator compartment evaporator 6. 7
is a solenoid valve that prevents the high-temperature, high-pressure refrigerant in the condenser 2 from flowing into the evaporator 4 for the freezer compartment and upstream of the evaporator 6 for the refrigerator compartment. Further, the evaporator 6 for the refrigerator compartment is divided by a check valve 6 and is composed of an upstream evaporator 6a for the refrigerator compartment and a downstream evaporator 6b for the refrigerator compartment. The refrigerant circuit is constructed by sequentially connecting these, and no defrosting heater is used in 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) provided in the refrigerator compartment, and the rotary compressor 1 is controlled to 0N10FF depending on the correlation between the refrigerator compartment temperature and the refrigerator compartment evaporator 6.

When the thermostat is ON, the refrigerant is supplied by the rotary compressor 1.
Condenser 2. The electromagnetic valve 71 is supplied to the freezer compartment evaporator 4 via the capillary tube 3, and is supplied to the refrigerator compartment upstream evaporator 6a, check valve 5. It is supplied to the downstream evaporator 6b for the refrigerator compartment, and cools each of the freezing compartment and the refrigerator compartment.

When the rotary compressor 1 stops when the thermostat is OFF, the solenoid valve 7 is closed, and the high-low pressure airtightness maintained within the compressor 1 during operation is broken, causing the high-temperature and high-pressure refrigerant in the outer shell to leak. The refrigerant flows back toward the suction line 8 and is filled up to the check valve 5 with high-temperature, high-pressure refrigerant. The temperature of the downstream evaporator 6b for the refrigerator compartment rises due to this high-temperature, high-pressure refrigerant flowing back, and the entire refrigerator compartment evaporator 6 is defrosted. In addition, the temperature rise of the refrigerator compartment evaporator 6 can be controlled by the installation position of the check valve 5, which has less influence on the temperature inside the refrigerator, and also prevents backflow to the freezer compartment evaporator 4, thereby increasing the temperature of the freezer compartment. This also reduces the operating load on the compressor 1.

When defrosting with the high-temperature, high-pressure refrigerant progresses and the temperature of the refrigerator compartment evaporator 6 reaches the set temperature, the thermostat is turned on again.
1. When the defrosting is completed, the rotary compressor 1 restarts the cooling operation.

Effects of the Invention As is clear from the above explanation, the present invention uses a high-pressure compressor in the outer shell, and connects the condenser 9 capillary tubes, the evaporator for the freezer compartment, the evaporator for the refrigerator compartment, etc. in sequence. A check valve is installed in the middle of the refrigerator compartment evaporator, so when the compressor is turned off every cycle, high-temperature, high-pressure refrigerant flows back into the refrigerator compartment evaporator downstream of the check valve to defrost. This eliminates the power consumption of conventional defrosting heaters, and the temperature rise of the refrigerator compartment evaporator can be controlled by adjusting the check valve installation position, making it possible to control the temperature inside the refrigerator each time it is defrosted. can be adjusted optimally.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram of a conventional refrigeration system, and FIG. 2 is a refrigerant circuit diagram of a refrigeration system according to an embodiment of the present invention. 1... Compressor, 2... Condenser, 4...
... Evaporator for freezer compartment, 6... Check valve, 6.
...Evaporator for refrigerator compartment. Name of agent: Patent attorney Toshio Nakao and 1 other person
Figure C Figure 2/

Claims (1)

[Claims] A refrigeration system in which a high-pressure compressor, a condenser, a capillary tube, an evaporator for the freezer compartment, an evaporator for the refrigerator compartment, etc. are connected in sequence in the outer shell, and a check valve is installed in the middle of the evaporator for the refrigerator compartment. Device.