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Freezing apparatus

A refrigeration device and refrigerant technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of reduced refrigeration capacity and inability to send liquid refrigerant to the main throttling mechanism.

Active Publication Date: 2015-08-12
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the liquid refrigerant cannot be sent to the main throttling mechanism, and the refrigerating capacity is lowered

Method used

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Examples

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Embodiment Construction

[0072] (1) Structure of refrigeration unit R

[0073] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a refrigerant circuit diagram of the refrigerating apparatus R according to one embodiment of the present invention. The refrigerating apparatus R in this embodiment includes a refrigerating machine unit 3 installed in an equipment room of a store such as a supermarket, and one or more (only one is shown in the drawing) display cabinets 4 installed in a sales floor of the store. These refrigerator units 3 and showcases 4 are connected by refrigerant pipes (liquid pipes) 8 and refrigerant pipes 9 via unit outlets 6 and unit inlets 7 to form a predetermined refrigerant circuit 1 .

[0074] The refrigerant circuit 1 of the embodiment uses carbon dioxide (R744) whose refrigerant pressure on the high-pressure side is equal to or higher than its critical pressure (supercritical) as a refrigerant. This carbon dioxid...

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PUM

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Abstract

The invention provides a freezing apparatus. When the high pressure side is up to a critical pressure, a steady freezing capacity can be guaranteed. The freezing apparatus comprises an electric expansion valve (33) that is connected to the downstream side of an air cooler (28) and the upstream side of an electric expansion valve (39); a liquid storing device (36) that is connected to the downstream side of the electric expansion valve (33) and the upstream side of an electric expansion valve (39); a heat exchanger (29) that is set at the downstream side of the air cooler and the upstream side of an electric expansion valve (33); an auxiliary circuit (48) that helps a refrigerant in the liquid storing device flows from electric expansion valves (43,47) into a first path (29A), and then back to a compressor (11); and a main circuit (38) that helps the refrigerant flows from the air cooler into a second path (29B) , and flows into the electric expansion valve (33) after heat exchange with the refrigerant flows in the first path, and makes the refrigerant flows from the lower part of the liquid storing device into the electric expansion valve (39); and electromagnetic valves (66,67) that are switched selectively, and make the refrigerant flows out of the first path back into the middle pressure part of the compressor or back to a low pressure part.

Description

technical field [0001] The invention relates to a refrigerating device in which a refrigerant circuit is formed by a compression mechanism, a gas cooler, a main throttling mechanism and an evaporator, and the high-pressure side reaches supercritical pressure. Background technique [0002] In the past, this type of refrigeration device constituted a refrigeration cycle by a compression mechanism, a gas cooler, and a throttling mechanism. The refrigerant evaporates, and the surrounding air is cooled by the evaporation of the refrigerant at this time. In recent years, Freon-based refrigerants have been gradually no longer used in such refrigerating devices due to natural environmental problems and the like. Therefore, the use of carbon dioxide, which is a natural refrigerant, as a substitute for Freon refrigerants is being developed. It is known that this carbon dioxide refrigerant is a refrigerant having a severe high-pressure difference and has a low critical pressure, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B1/00F25B41/06F25B49/02F25B41/34
CPCF25B9/00F25B49/022F25B2500/29F25B2500/07F25B2309/061F25B41/31
Inventor 冈村隼次轰笃
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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