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refrigeration unit

A refrigeration device and refrigerant technology, applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problem of damage to the compressor, achieve the effect of increasing the defrosting heat and shortening the defrosting time

Active Publication Date: 2017-06-09
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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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

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

[0028] exist 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 . And the heat source unit 1 and the defrosting unit 3 are connected via the 1st exhaust gas connection pipe 26a, the 2nd exhaust gas connection pipe 26b, and the 1st high pressure pipe 11a. Further, 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 heat e...

Embodiment approach 2

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

[0054] exist Figure 6 Among them, the high-low pressure heat exchanger 27 as the second heat exchange part is capable of connecting the refrigerant flowing in the pipeline 28a between the first discharge gas connection pipeline 26a and the hot gas pressure regulating valve 18 and the refrigerant accumulated in the low pressure pipeline 12 and The refrigerant flowing in the pipeline 28b between the devices 9 performs heat exchange.

[0055] In addition, other configurations are configured in the same manner as in the first embodiment.

[0056] In the defrosting operation mode of the re...

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PUM

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Abstract

The present invention provides a refrigerating device capable of preventing liquid refrigerant from flowing back to a compressor and shortening defrosting time without increasing engineering cost and equipment cost. The refrigerating device of the present invention has: the refrigerant discharged from the compressor is sequentially pressure-transmitted to the first flow regulating device, the heat storage tank, the condenser, the first decompression device, and the evaporator, and makes it return to the compressor The refrigeration circuit; the refrigerant discharged from the compressor is sequentially pressure-transmitted to the first flow regulating device, the heat storage tank, the first decompression device, and the evaporator, and make It returns to the defrosting circuit of the compressor; and selectively connects the outlet side of the heat storage tank with the inlet side of the condenser or the inlet side of the first decompression device, and forms the refrigeration circuit or the flow switching device of the defrosting circuit.

Description

technical field [0001] The present invention relates to a refrigeration device that cools and maintains the interior of, for example, a refrigerated warehouse at a set temperature, and more particularly relates to a refrigeration device that performs a defrosting operation using hot air. Background technique [0002] In such a refrigerating device, during cooling operation, frost increases in the evaporator to hinder heat transfer, and thus defrosting operation is performed at regular intervals. As the defrosting operation, a method of energizing an electric heater embedded in an evaporator and a method of directly flowing high-temperature refrigerant immediately discharged from a compressor into 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 desired to complete the defrosting in as short a time as possible...

Claims

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Application Information

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