JPH0515948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a refrigeration device such as a two-temperature refrigerator that includes an evaporator for a freezer compartment and an evaporator for a refrigerator compartment.

Conventional configuration and its problems The refrigerant circuit of a conventional two-temperature refrigerator is as follows:
As shown in FIG. 1, refrigerant from a compressor a is supplied to a freezer compartment evaporator d and a refrigerator compartment evaporator e through a condenser b and a capillary tube c to simultaneously cool them.
The temperature inside the refrigerator is controlled by controlling the compressor a on and off using a thermostat (not shown) provided in the refrigerator compartment. Here, if the compressor a is an in-shell high pressure type, the high temperature and high pressure gas in the compressor a will flow back into the evaporator d for the freezer compartment and the evaporator e for the refrigerator compartment when the compressor a is stopped. In order to prevent this, a check valve f is provided between the suction line g and the compressor a. Similarly, i is a solenoid valve that cuts off high-temperature, high-pressure gas when compressor a is stopped.

In such a refrigerant circuit, the refrigerator compartment evaporator e
Defrosting is generally carried out every cycle when the compressor a is stopped. Conventionally, defrosting is carried out every cycle when the compressor a is stopped by a defrosting heater h installed near the evaporator for the refrigerator compartment. It was frosty.

However, in the current environment where the energy saving trend is increasing, the power consumption by the heater h has become impossible to ignore. 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.

Structure of the Invention In order to achieve this object, the present invention provides a check valve in the middle of an evaporator for a refrigerator compartment, and when the compressor is stopped, high-temperature, high-pressure refrigerant in the compressor is transferred to the evaporator for the refrigerator compartment downstream of the check valve. When the refrigerant is condensed in the refrigerator compartment evaporator, the heat released is used to defrost the refrigerant, eliminating the need for a defrosting heater in the refrigerator compartment evaporator to reduce power consumption. The temperature of the evaporator can also be optimized by setting the check valve position.

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 inside the outer shell), 2 is a condenser, 3 is a capillary tube, 4 is an evaporator for the freezer compartment, and 5 is a high-temperature, high-pressure refrigerant in the rotary compressor 1. This is a check valve that prevents the liquid 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 described later. It is installed in the department. Reference numeral 7 designates 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 refrigerator compartment evaporator 6 is divided by a check valve 5 and includes 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) installed in the refrigerator compartment, and the rotary compressor 1 is controlled depending on the correlation between the refrigerator compartment temperature and the refrigerator compartment evaporator 6.
is controlled ON/OFF.

When the thermostat is ON, the refrigerant flows to rotary compressor 1.
The evaporator 4 for the freezer compartment is supplied via the condenser 2, the electromagnetic valve 7, and the capillary tube 3, and is supplied to the upstream evaporator 6a for the refrigerator compartment, the check valve 5, and the downstream evaporator 6b for the refrigerator compartment. Cool the room and 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. is suction line 8
The refrigerant flows backward toward the check valve 5 and is filled 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, defrosting is completed, and the rotary compressor 1 resumes cooling operation.

Effects of the Invention As is clear from the above description, the present invention uses an in-shell high-pressure compressor, and sequentially connects a condenser, a capillary tube, an evaporator for the freezer compartment, an evaporator for the refrigerator compartment, etc. 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 is allowed to flow back into the refrigerator compartment evaporator downstream of the check valve for defrosting. This eliminates the power consumption of conventional defrosting heaters, and the temperature rise of the refrigerator compartment evaporator can be controlled by adjusting the installation position of the check valve, making it possible to optimally adjust the temperature inside the refrigerator each time it is defrosted. .

[Brief explanation of the drawing]

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, 5... Check valve, 6... Evaporator for refrigerator compartment.

Claims (1)

[Claims] 1 A high-pressure type compressor in the outer shell, a condenser, a capillary tube, an evaporator for the freezer compartment, an evaporator for the refrigerator compartment, etc. were connected in sequence, and a check valve was installed in the middle of the evaporator for the refrigerator compartment. Refrigeration equipment.