Freezing apparatus

A refrigeration device and refrigerant technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of reduced performance coefficient, increased compression power, and reduced refrigeration capacity, and achieved the effect of improving performance coefficient

CN104833124AActive Publication Date: 2015-08-12PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-08-12

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Abstract

The invention provides a freezing apparatus. When the high pressure side is up to a critical pressure, a compression mechanism can be prevented from being influenced by the high pressure, and the freezing capacity of the freezing apparatus can be prevented from being influenced by outside air temperature. 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 casing (36) that is connected to the downstream side of the freezing apparatus and the upstream side of an electric expansion valve (39); a separating heat exchanger (29) that is set at the downstream side of the freezing apparatus and the upstream side of an electric expansion valve (39); an auxiliary circuit (48) that helps a refrigerant in the casing flows from electric expansion valves (43,47) into the separating heat exchanger, and then into the middle compression part of a compressor (11); and a main circuit (38) that helps the refrigerant flows from the lower part of the casing into the separating heat exchanger , and flows into the electric expansion valve (39) after heat exchange with the refrigerant flows in the first path; and a control apparatus (57) adjusts the pressure in the high pressure side of the refrigerant loop at the upstream side through the electric expansion valve (33).
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Description

Technical field

[0001] The invention relates to a refrigeration device in which a compression mechanism, a gas cooler, a main throttling mechanism and an evaporator constitute a refrigerant circuit, and the high pressure side reaches a supercritical pressure. Background technique

[0002] In the past, this type of refrigeration device constitutes a refrigeration cycle by a compression mechanism, a gas cooler, a throttle mechanism, etc. The refrigerant compressed by the compression mechanism radiates heat in the gas cooler, and is decompressed by the throttle mechanism, and then used in the evaporator. The refrigerant evaporates, and the evaporation of the refrigerant at this time is used to cool the surrounding air. In recent years, Freon-based refrigerants have gradually ceased to be used in such refrigeration devices due to natural environmental problems. Therefore, the use of carbon dioxide as a natural refrigerant as a substitute for Freon refrigerant is being developed. It...

Examples

Embodiment Construction

[0090] (1) Structure of refrigeration unit R

[0091] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 This is a refrigerant circuit diagram of a refrigeration system R to which one embodiment of the present invention is applied. The refrigerating device R in this embodiment includes a refrigerator unit 3 installed in an equipment room of a supermarket or the like, and one or more (only one shown in the drawing) showcase 4 installed in the counter of the shop. These refrigerating machine units 3 and showcases 4 are connected via a refrigerant pipe (liquid pipe) 8 and a refrigerant pipe 9 via a unit outlet 6 and a unit inlet 7 to constitute a predetermined refrigerant circuit 1.

[0092] The refrigerant circuit 1 uses carbon dioxide (R744) whose refrigerant pressure on the high-pressure side is higher than its critical pressure (supercritical) as a refrigerant. The carbon dioxide refrigerant is a natural refrigerant that i...