JPS5851178B2 - Reitokiniokereibaigasuno Netsukou Kanhouhou - Google Patents

Description

[Detailed description of the invention] The present invention relates to a defrosting device for a refrigerator.

A defrosting device in a conventional refrigerator removes frost adhering to a cooler using high-temperature, high-pressure refrigerant gas pumped from a compressor, and sends the defrosted refrigerant gas containing liquefied refrigerant to a heat exchanger.

The heat exchanger expands and vaporizes the refrigerant gas with water and then sends the gas back to the compressor to prevent the refrigerant from returning to the compressor.

This liquid return phenomenon refers to the liquefied refrigerant entering the compressor when the refrigerant returns from the cooler to the compressor, and this causes damage to the compressor.

However, in the case of a refrigerant that expands and vaporizes with water as described above, the expansion and vaporization efficiency of the refrigerant is poor, and liquid or mist gas that cannot be completely vaporized may enter the compressor and damage the compressor. was there.

Therefore, the present invention improves the expansion and vaporization efficiency of the refrigerant returning from the cooler to the compressor, eliminates the liquid return phenomenon of the refrigerant to the compressor, and prevents damage to the compressor due to this liquid return phenomenon. The purpose is to provide equipment.

The defrosting device of the present invention that meets this objective is comprised of an inner box in which a radiator and an expansion tank are disposed close to each other between a compressor and a cooler, and an outer box housing the inner box. A heat exchanger is provided to heat the expansion tank by forcibly circulating the warm air released from the radiator through the gap between the inner case and the outer case and the air passage inside the inner surface, and the compressor and the radiator are heated. At the same time, a high-pressure solenoid valve is installed in the middle of the radiator and the condenser is connected to the condenser, and the outlet of the expansion valve is connected to the condenser and the cooler is connected by branching the conduit at the outlet of the expansion valve. Then, the pipe line at the inlet of the low-pressure solenoid valve disposed in the pipe connecting the cooler, the compressor, and the cooler is branched, and a defrost solenoid valve and a defrost expansion valve are disposed in the middle. An expansion tank is connected to the compressor, and the expansion tank and the compressor are connected through a pipe.

An embodiment of the present invention will be explained below in detail based on the drawings. 1 is a compressor, 2 is a radiator, 3 is a condenser, 4 is a cooler, 5 is an expansion valve, 6 is a heat exchanger, and 7 is an expansion for defrosting. Valves: 8 is a blower, 9 is an expansion tank, Dl is a high-pressure solenoid valve, D2 is a low-pressure solenoid valve, D3 is a defrosting solenoid valve that opens when defrosting, and each device has the piping and configuration as shown in the diagram. .

To describe the circuit configuration, a radiator 2 in a heat exchanger 6 is connected to the compressor 1 through a pipe 12, a water-cooled condenser 3 is connected to the radiator 2 through a pipe 12', and the condenser 3 to tube 12"
In the middle of the dryer D1 side glass S1 solenoid valve D4,
A packless valve P is provided, and a cooler 4 is connected through an expansion valve 5, and a compressor 1 is connected to the cooler 4 through a pipe 12# through a low-pressure solenoid valve D2.

Further, the pipe 12' is branched to the radiator 2, and the high pressure solenoid valve D1 is connected to the radiator 2.
A pipe 12'' is branched at the outlet of the expansion valve 5 to connect it to the cooler 4, and a defrosting solenoid valve is connected to the cooler 4 by a pipe 10 branched at the inlet of the low-pressure solenoid valve D2. D3 and an expansion tank 9 in the heat exchanger 6 are connected through the defrost expansion valve 7, and a pipe 11'' and a pipe 12''' are connected to the expansion tank 9.
The compressor 1 is connected via.

The dryer D disposed in the pipe 12'' is a part that removes impurities such as moisture and dust, the side glass S is a part that monitors the flow of liquefied gas, and the solenoid valve D4 is a thermostat that controls a predetermined temperature inside the cooler. In combination, the packless valve P, which is a valve that electrically stops the inflow of gas, is a valve that collects gas into the condenser.

The heat exchanger 6 has a double structure inside and outside, as shown in the second figure, and has an outer box part 6 with an arbitrary number of ventilation holes a.
A ventilation passage P is formed between ' and the inner surface 6'', and a blower 8 driven by a motor is installed by opening the rear of the inner case, and a ventilation port 8' is opened at the front of the inner case. be done.

9′, 9″, 9″ are expansion tanks arranged in parallel inside the inner surface 6″, and a branch 10′ at the tip of the pipe 10 connected to the cooler 4.
, 10″.

10"' and connect to expansion tanks 9', 9", 9"'.

IL11', 11" is expansion tank 9', 9" 9///
It is a return pipe for the refrigerant gas inserted in the pipe 11'', and is collected at one end of the pipe 11'' and connected to the compressor 1 via the pipe 12''.

Next, the operating method will be explained. First, in normal (refrigeration) operation, high temperature and high pressure refrigerant gas compressed by the compressor 1 is sent under pressure to the pipe 12, and the heat of the refrigerant gas is radiated in the radiator 2, and the pipe 12'
The refrigerant gas is passed through the condenser 3 and cooled, and the liquefied refrigerant gas is sent to the pipe 1.
2" dryer D1, side glass S1, solenoid valve, packless valve P, evaporates in expansion valve 5, cools the inside in cooler 4, passes through pipe 12" low solenoid valve D2, and supplies to compressor 1. Allow reflux.

Next, to describe the defrosting operation, the high-temperature, high-pressure gas pumped from the compressor 1 passes through the pipe 12, releases gas heat in the radiator 2, passes through the high-pressure solenoid valve D1, enters the cooler 4, and enters the cooler 4. The frost adhering to the pipe is removed, and the cooled refrigerant gas containing the liquefied refrigerant after defrosting passes through the defrosting solenoid valve D3 of the pipe 10 and the defrosting expansion valve 7 to branch pipes 10', 10"l Q// /more expansion tank 9'.

9" 9/// into the expansion tanks 9', 9", 9"
The vaporized refrigerant gas is expanded and vaporized in the return pipe 11゜11.
', 11'' through tube 11'' and tube 12''' to the compressor 1.
Return to

The present invention is constructed as described in detail and has the following effects.

(1) During defrosting, refrigerant gas is pumped from the compressor to a radiator installed in the heat exchanger to release heat, and then the gas is introduced into the cooler to remove the frost inside the cooler. At this time, the cooled gas is returned to the heat exchanger and a mixture of air forcedly circulated within the heat exchanger and warm air released from the radiator is used to
After efficiently expanding and vaporizing the cold refrigerant gas, it is returned to the compressor, so the cold liquid or mist gas that comes out of the cooler during defrosting is completely expanded and vaporized, completely eliminating the liquid pack phenomenon. can be resolved.

(2) During defrosting operation, the refrigerant gas pumped by the high-temperature, high-pressure compressor is put into the radiator to release heat before being sent to the cooler, so the heating rate of the cooler slows down. , it is possible to eliminate the loss of cooling energy due to excessive heat in the cooler when switching to normal operation.

[Brief explanation of the drawing]

The drawings are illustrations of an embodiment, and FIG. 1 is a circuit diagram of the present invention during normal operation, and FIG. 2 is a circuit diagram during defrosting. 1...Compressor, 2...Radiator, 3...
...Condenser, 4...Cooler, 5...
・Expansion valve, 6...Heat exchanger, 6'...
Outer box part, 6"...Inner surface, 7...Defrost expansion valve, Dl...High pressure solenoid valve, D2...
...Low pressure solenoid valve, D3...Defrosting solenoid valve,
D4...Solenoid valve, a...Vent hole, P.
...Ventilation duct, 8...Blower, 8'...
... Vent, 9.9', 9", 9"... Expansion tank, 10.11", 12, 12', 12", 12
"'...Pipe, 10'. 10", 10"'...Branch pipe, 11.11'11"...Return pipe.

Claims (1)

[Claims] 1 Consisting of an inner box in which a radiator and an expansion tank are placed close to each other between the compressor and the cooler, and an outer box housing the inner box, the warm air released from the radiator is transferred to the inner box. A heat exchanger is provided that heats the expansion tank by forced circulation through the gap between the outer case and the air passage inside the inner surface, and the compressor and the radiator are connected by a pipe line, and the heat radiator and A high-pressure solenoid valve is installed in the middle of the pipe connecting the condenser and cooler, and the pipe at the outlet of the expansion valve is branched to connect the cooler, and the cooler is connected to the compressor. A pipe line at the inlet of a low-pressure solenoid valve disposed in a pipe line connecting a cooler is branched, a defrosting solenoid valve and a defrost expansion valve are disposed in the middle, and the expansion tank is connected to the expansion tank. A defrosting device for a refrigerator, comprising a compressor and a compressor connected through a pipe.