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Refrigerating device

A refrigeration device and refrigerant technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as damage to compressors, and achieve the effect of increasing defrosting heat and shortening defrosting time.

Active Publication Date: 2016-05-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there may be a risk that the refrigerant is not completely vaporized, and a part of it is sucked into the compressor while maintaining the state of liquid refrigerant, thereby damaging the compressor.

Method used

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  • Refrigerating device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] figure 1 It is a refrigerant circuit configuration diagram of the refrigeration apparatus according to Embodiment 1 of the present invention.

[0028] in figure 1 Among them, the refrigeration device has: a heat source unit 1 installed outdoors; a cooling unit 2 installed in a freezer to be cooled; and a defrosting unit 3. In addition, the heat source unit 1 and the defrosting unit 3 are connected via a first exhaust gas connection pipe 26a, a second exhaust gas connection pipe 26b, and a first high-pressure pipe 11a. In addition, the cooling unit 2 is connected to the defrosting unit 3 via the second high-pressure pipe 11 b, and the cooling unit 2 is connected to the heat source unit 1 via the low-pressure pipe 12. In addition, in the first embodiment, the number of cooling units 2 is one, but the number may be two or more.

[0029] The heat source unit 1 has: a compressor 4 that compresses refrigerant; an air-cooled condenser 5; a receiver 6; an economizer 7 as a first he...

Embodiment approach 2

[0053] Image 6 It is a refrigerant circuit diagram showing the flow of refrigerant during the defrosting operation of the refrigeration apparatus according to Embodiment 2 of the present invention, Figure 7 It is a state diagram showing the refrigeration cycle operation during the cooling operation of the refrigeration apparatus according to the second embodiment of the present invention.

[0054] in Image 6 In the second heat exchange section, the high and low pressure heat exchanger 27 is capable of resisting the refrigerant circulating in the pipe 28a between the first exhaust gas connection pipe 26a and the hot gas pressure regulating valve 18 and the low pressure pipe 12 and accumulating The refrigerant flowing in the pipe 28b between the devices 9 is configured to exchange heat.

[0055] In addition, the other structure is the same as that of the first embodiment.

[0056] In the defrosting operation mode of the refrigeration apparatus configured as described above, the sol...

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PUM

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Abstract

The purpose of this invention is to provide a refrigerating device that can prevent liquid refrigerant from flowing back to a compressor and that can shorten the defrost time without increasing construction costs or equipment costs. This refrigerating device comprises: a refrigeration circuit by which refrigerant that is discharged from a compressor is returned to the compressor by being pumped to a first flow rate regulating device, a thermal storage tank, a condenser, a first pressure reducing device, and an evaporator, in sequence; a defrost circuit by which the refrigerant that is discharged from the compressor is returned to the compressor by being pumped to the first flow rate regulating device, the thermal storage tank, the first pressure reducing device, and the evaporator, in sequence; and a flow channel switching device that forms the refrigeration circuit or the defrost circuit by selectively connecting the outlet side of the thermal storage tank to the inlet side of the condenser or to the inlet side of the first pressure reducing device.

Description

Technical field [0001] The present invention relates to a refrigeration device that cools and maintains the inside of a refrigerated warehouse to a set temperature, and more particularly relates to a refrigeration device that uses hot air for defrosting operation. Background technique [0002] In this type of refrigeration device, during the cooling operation, frost increases in the evaporator and hinders heat transfer, so the defrosting operation is performed at a certain cycle. As the defrosting operation, a method of energizing an electric heater embedded in an evaporator, and a method of directly circulating a high-temperature refrigerant just discharged from the compressor to the frosted cooling gas (hot gas bypass method) are known. [0003] However, since the temperature in the refrigerated warehouse rises during the defrosting operation in which the cooling capacity cannot be exerted, it is desirable to complete the defrosting in as short a time as possible. [0004] In addi...

Claims

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Application Information

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IPC IPC(8): F25B47/02F28D20/00
CPCF25B47/022F25B2400/13F25B2400/24F28D20/00
Inventor 齐藤信亩崎史武
Owner MITSUBISHI ELECTRIC CORP