JPH0123708B2 - - Google Patents

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, and controls the temperature inside the refrigerator by controlling the operation of the compressor.
This relates to the improvement of refrigerators by turning them on and off.

Conventionally, in this type of electric refrigerator, the temperature inside the refrigerator is controlled to a predetermined temperature by controlling the operation of a compressor forming a cooling system on and off using a temperature detection thermostat provided inside the refrigerator. As is well known, a cooling system consists of a compressor, condenser, capillary tube, and evaporator connected in sequence.
During operation, high-temperature, high-pressure refrigerant exists in the condenser, and low-temperature, low-pressure refrigerant exists in the evaporator. However, in a high-pressure vessel type compressor, the pressure inside the compressor is high, so when the compressor is stopped, the high-temperature, high-pressure refrigerant accumulated inside the compressor and condenser remains at a low temperature and low pressure. attempts 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, making airtightness impossible due to this oil, and a large amount of high temperature inside the compressor. , the high-pressure refrigerant flows back from the compressor suction port to the evaporator outlet, creating a heat load inside the refrigerator.

As an improvement to this kind of drawback, for example, Jitsukaiaki
As shown in Publication No. 55-96373, a check valve is installed in front of the compressor suction port, but a portion of the piping between the evaporator outlet and the check valve is located outside the refrigerator. Heat is absorbed from this part, and the refrigerant inside the pipe is heated and flows into the evaporator. At the same time, the refrigerant releases heat in the evaporator and becomes low temperature, and then flows back to the pipe located outside the refrigerator. This is the heat pipe phenomenon. This caused an increase in the heat load inside the refrigerator, and the effect of providing a check valve was halved.

Regarding this point, the present invention eliminates all of the above drawbacks by not only burying the piping between the evaporator outlet and the check valve in the heat insulating material, but also embedding the check valve in the heat insulating material. This allows the check valve to fully demonstrate its effectiveness.

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

In the figure, 1 is the refrigerator body, and the insulation wall 2
A partition member 4 is provided to partition the inside of the cabinet 3 into upper and lower sections, and the upper chamber is divided into a freezer 5 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 member 4 is equipped with an evaporator 9, which is 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 5, 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 15 is provided on the upper surface of the freezer compartment 5 to detect the temperature inside the freezer compartment 5 and turn the compressor 14 on and off.

The cooling system includes a rotary compressor 14 (hereinafter simply referred to as a compressor), which has a high pressure inside a closed container, a condenser 16, a capillary tube 17,
The evaporators 9 are connected in sequence, and a check valve 18 is provided between the evaporator 9 outlet and the compressor 14 suction port,
The first suction pipe 19 connects the check valve 1 to the upstream side of the check valve between the evaporator 9 outlet and the check valve 18 inlet.
The outlet 8 and the suction port of the compressor 14 are connected downstream from the check valve by a second suction pipe 20, respectively. The first suction pipe 19 is the evaporator 9
A part of the side is placed in the partition material 4, and the other part is placed in the insulation wall 2.
Piping is buried inside. A check valve 18 connected to the first suction pipe 19 is also embedded in the heat insulating wall 2. That is, the second suction pipe 20 passes through the cabinet outer plate 3a of the inclined heat insulating wall 2 that constitutes a part of the machine room 1a in the lower part of the main body 1 in which the compressor 14 is placed, and the first suction pipe 19 The check valve 18 is buried so as to extend substantially vertically from the penetration part 3a' of the buried plate 3a, and the penetration part is formed horizontally to facilitate piping work. In addition, the check valve 18 and the first suction pipe 19 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 and are penetrated therein in order to reduce heat absorption from outside the refrigerator.

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

By controlling the compressor 14 and the fan 10 on and off using the thermostat 15 provided in the freezer compartment 5, and by adjusting the opening area of the cold air outlet 12 for the refrigerator compartment using the damper 13 provided in the refrigerator compartment 6, The freezer compartment 5 and the refrigerator compartment 6 are each cooled to 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, so the refrigerant passage of the check valve 18 is opened, and the normal cooling operation is started. At the same time as the compressor 14 stops, the high and low pressure airtightness created by the oil in the compressor 14 is broken, and the high temperature, high pressure refrigerant inside the compressor 14 flows back into the second suction pipe 20. As a result, the pressures between the first suction pipe 19 and the second suction pipe 20 are reversed,
The refrigerant passage is closed to the check valve 18.

In the present invention, the check valve 18 is buried in the heat insulating wall 2 at a position closest to the compressor 14, so although the second suction pipe 20 becomes high temperature, there is no adverse effect on the refrigerator compartment 6. be. In addition, the check valve 18 and the first suction pipe 19, which have a larger surface area and a larger amount of heat absorption than the suction pipe 19, are inside the heat insulating wall 2, and because they do not absorb heat from both of them, the The heat pipe effect can be completely eliminated, and the heat load caused by the high temperature, high pressure refrigerant flowing into the evaporator 9 can be suppressed. Further, since the check valve 18, which is a source of noise, is covered by the heat insulating wall 2, noise can be almost completely eliminated.

As is clear from the above description, the refrigerator according to the present invention cools the inside of the refrigerator using a cooling system configured by sequentially connecting a high-pressure container type compressor, a condenser, a pressure reducing device, and an evaporator, and controls the temperature inside the refrigerator. is performed by ON-OFF operation of the compressor, a check valve is provided between the evaporator outlet and the compressor suction port, and the check valve and the suction pipe upstream of the check valve are Since it is embedded in the heat insulating wall, it can prevent heat absorption from both the check valve and the suction pipe, and eliminate heat pipe action in the suction pipe that connects the check valve and the evaporator outlet. This can maximize the effectiveness of the check valve.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a refrigerator according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main parts thereof. 14...Compressor, 16...Condenser, 17...Pressure reducing device, 2...Insulating wall, 18...Check valve, 19,
20... Suction pipe.

Claims (1)

[Claims] 1. A cooling system consisting of a compressor, condenser, capillary tube, and evaporator connected in sequence,
The interior of the refrigerator is cooled and the temperature inside the refrigerator is controlled by ON/OFF operation of the compressor, and the evaporator outlet and the compressor inlet are connected by a suction pipe with a check valve interposed therebetween. A refrigerator in which the check valve is embedded at least upstream of the check valve, and the check valve is embedded in the insulation material.