JPS5818077A - 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 The present invention uses a high-pressure container type compressor such as a rotary compressor as a compressor constituting a cooling system,
The present invention relates to an improvement of a refrigerator in which the temperature inside the refrigerator is controlled by turning the compressor ON and OFF.

Conventionally, in this type of electric refrigerator, the temperature inside the refrigerator is controlled to a predetermined temperature by ON-OFF control of the operation of a compressor forming a cooling system using a temperature detection thermostat provided inside the refrigerator.

As we all know, the cooling system consists of a compressor and a condenser.

It consists of a capillary cheep and an evaporator connected in sequence.During operation, high-temperature, high-pressure refrigerant is in the condenser, and low-temperature, high-pressure refrigerant is in the evaporator.
Each has a low pressure refrigerant.

However, in a high-pressure container type compressor, the pressure inside the compressor is high, so when the compressor is stopped, the high-temperature, high-pressure refrigerant that has accumulated inside the compressor and condenser is maintained at a low temperature and low pressure. It tries to flow into the evaporator. While the compressor's compression mechanism is in operation, it is possible to airtightly separate high and low pressures using oil, but as soon as the compressor is stopped, the oil circulation stops, and airtightness due to this oil becomes impossible, resulting in a large amount of oil inside the compressor. The high-temperature, high-pressure refrigerant flows back from the compressor suction port to the evaporator outlet, creating a heat load of 1 inside the refrigerator.

3.

For example, as an improvement to this kind of drawback,
As shown in Publication No. 6373, a method of installing a check valve in front of the compressor suction port has been adopted, but since a part of the piping between the evaporator outlet and the check valve is located outside the refrigerator, this part The refrigerant in the piping is heated, flows into the evaporator, and radiates heat in the evaporator, causing the low-temperature refrigerant to flow back into the piping located outside the refrigerator, creating a so-called heat pipe phenomenon. This resulted in an increase in the heat load inside the refrigerator.

Regarding these drawbacks, this method involves interposing a check valve in the piping between the evaporator outlet and the compressor inlet (hereinafter referred to as the suction pipe), and installing the check valve and suction pipe horizontally in the insulation material. In addition, the above-mentioned drawbacks are improved by locating the suction pipe upstream of the check valve closer to the inside of the refrigerator and the downstream side closer to the outside of the refrigerator.

An embodiment of Honyiro will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a refrigerator body, and a partition member 4 is provided to partition the inside of a cabinet 3 made of a heat insulating wall 2 into upper and lower parts, and the upper chamber is divided into a freezing chamber 6 and the lower chamber into a refrigerator chamber 6. Both chambers 5 and 6 have dedicated freezer compartment doors 7 and refrigerator compartment doors 8, respectively. The interior of the partition 4 is equipped with an evaporator 9 that forms part of a well-known cooling system, and a fan 10 that sends cold air into the refrigerator. Cold air is sent to each chamber 6, 6 to cool the inside of the warehouse. The cold air outlet 12 for the refrigerator compartment is equipped with a damper 13 that detects the temperature inside the refrigerator compartment 6 and adjusts the opening area of the cold air outlet 12 for the refrigerator compartment. (This damper 13 is generally called a damper thermostat, and may be of a conventionally known type.) Furthermore, a thermostat 16 is provided on the upper surface of the freezer compartment 6 to detect the temperature inside the freezer compartment 6 and turn the operation of the compressor 14 ON-OFF. ing.

The cooling system includes a rotary compressor 14 (hereinafter simply referred to as a compressor), which generates high pressure inside a closed container, and a condensing unit.
vessel 16, capillary tube 17, evaporator 9. , are connected in sequence, evaporator 9 outlet ゛ and compressor 1
A check valve 18 is provided between the 4 suction ports, and a first suction pipe 19 connects the check valve 18 outlet and the compressor to the upstream side of the check valve between the evaporator 9 outlet and the reversal valve 18 port. The downstream side of the check valve is connected to the suction port 14 by a second suction pipe 2o. A part of the first suction pipe 19 on the side of the evaporator 9 is disposed inside the partition material 4, but the other part of the first suction pipe 19 and the check valve 18 connected thereto are insulated. It is buried in wall 2. In addition, the check valve 18 and the first suction pipe 19Fi are located approximately in the center of the heat insulating wall 2 on the back of the main body or closer to the inside of the refrigerator than the center in order to reduce heat absorption from outside the refrigerator.

The first suction pipe 2o and the capillary peak 1
7 is conventional in that the refrigerant in the cavity retainer 17 is brought into thermal contact and supercooled to increase the refrigerating capacity.

In addition, the second suction pipe 20 is operated when the compressor is stopped.
The high-temperature, high-pressure refrigerant flowing back from the compressor suction port is heated, but since it is thermally isolated from the capillary chest, the capillary chest is not heated, and the refrigerant is not heated outside the refrigerator from the center of the insulation material 2. It is located closer to the refrigerator to suppress heat radiation into the refrigerator.

Next, the operation of the above configuration will be explained.

The compressor 1 is controlled by the thermostat 16 installed in the frozen accommodation 5.
4 and fan 1o to ON-OFF operation control,
The damper 13 provided in the refrigerator compartment 6 adjusts the opening area of the cold air outlet 12 for the refrigerator compartment, and cools the freezer compartment 6 and the refrigerator compartment 6 to respective predetermined temperatures.

During the cooling operation, the pressure in the second suction pipe 20 is lowered by the compressor 14 than in the first suction pipe 19, the refrigerant passage of the check valve 18 is opened, and a regular cooling operation is performed.

At the same time as the compressor 14 stops, the high and low pressure airtightness due to the oil in the compressor 14 is destroyed, and the high temperature, high pressure refrigerant inside the compressor 14 flows back to the second suction no. (eve 2o).For this reason, The pressure between the first suction pipe 19 and the second suction pipe 20 is reversed, and the check valve 1
No. 8 refrigerant passage is closed.

Furthermore, when the compressor 14 is stopped, high-temperature, high-pressure refrigerant flows backward through the compressor 14 and flows into the second suction pipe 2o, but since the flow path of the check valve 18 is closed, the first
The first suction pipe 19 does not flow into the first suction pipe 19, and the first suction pipe 19 and the cavity chest 17 in heat exchange contact with the first suction pipe 19 are not heated. Furthermore, since the second suction pipe 2o is located closer to the outside of the refrigerator than the center of the heat insulating wall 2, the temperature is higher than that inside the refrigerator compartment 6, but heat radiation to the refrigerator compartment 6 can be suppressed. Conversely, the first suction pipe 19 and the check valve 18, which has a larger surface area and a larger amount of heat absorption, are located closer to the inside of the refrigerator than the center of the insulation wall 2, so they absorb heat from outside the refrigerator and prevent evaporation. It cannot be used as a heating source for the vessel 9.

In addition to the above-F effect, the check valve 18 generated some noise when operating in reverse, although the noise was generated by the check valve 18.
Since the whole is covered with the heat insulating wall 2, noise can be almost completely eliminated.

As is clear from the above explanation, the refrigerator according to this printing uses a cooling system consisting of a high-pressure container type compressor, a condenser, a capillary tube, and an evaporator connected in sequence to cool the inside of the refrigerator. The temperature inside the refrigerator is controlled by ON-OFF operation of the machine; The downstream side of the check valve between the stop valve outlet and the compressor suction port is connected by a second suction pipe, and the check valve and the first suction pipe are buried in the heat insulating wall of the refrigerator. , the first suction pipe and the capillary tube are brought into thermal contact with each other, so there is no adverse effect on the cooling operation compared to conventional methods, and when the operation is stopped, the air flow from the compressor suction port to the evaporator is reduced. backflow of high temperature refrigerant;
This not only makes it possible to prevent heat absorption from the check valve and suction pipe and completely eliminate the heat load flowing into the evaporator, but also provides a refrigerator with improved noise. .

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of a refrigerator showing one embodiment of the present invention. 2... Heat insulation layer 9... Cooler 14.
... Compressor) 16 ... Condenser 117 ...
...Capillary tube, 18, Check valve, 19, First suction pipe, 20
,,,,,Second suction pipe.

Claims (1)

[Claims] A cooling system consisting of a compressor, a condenser, a capillary tube, and an evaporator are connected in sequence to cool the inside of the refrigerator and control the temperature inside the refrigerator by turning the compressor on and off. Connect the machine suction port with a suction pipe with a check valve in between, and bury the suction pipe and check valve in the insulation wall, and connect the suction pipe upstream of the check valve to the storage space from the center of the insulation wall. The refrigerator is characterized in that the inward side and the downstream side of the reversal valve are disposed on the outside side from the center of the heat insulating wall.