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Refrigerating apparatus

A technology of refrigeration device and valve device, which is used in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of poor return efficiency, supercooled oil in oil coolers, etc., and achieve the effect of preventing viscosity from rising.

Active Publication Date: 2011-06-29
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Here, if the oil cooler is installed in the air passage provided with the gas cooler and they are air-cooled by the same blower, when the outside air temperature is low, the oil in the oil cooler will be overcooled. Refrigerant becomes easily soluble in oil
There is a problem that the return efficiency to the compression mechanism is deteriorated due to the viscosity of the oil dissolved in the refrigerant increases and becomes heavier.

Method used

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Embodiment Construction

[0089] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a refrigerant circuit diagram of the refrigeration apparatus R which concerns on embodiment of this invention. The refrigerator R of this embodiment includes a refrigerator unit 3 and a plurality of showcase units 5A, 5B. The refrigerator unit 3 and each showcase unit 5A, 5B are connected by refrigerant pipes 7 and 9 to form a predetermined refrigeration cycle.

[0090] In this refrigerating cycle, carbon dioxide whose refrigerant pressure on the high pressure side (high pressure) is equal to or higher than its critical pressure (supercritical) is used as a refrigerant. This carbon dioxide refrigerant is a natural refrigerant that is beneficial to the global environment and considers flammability, toxicity, and the like. In addition, existing oils such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, and PAG (polyalkylene glycol) are u...

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Abstract

An object of the present invention is to keep an appropriate amount of a refrigerant to be circulated through a refrigerant circuit and prevent an overload operation of compression means due to high pressure abnormality in a refrigerating apparatus which obtains a supercritical pressure on a high pressure side. The refrigerating apparatus (R) obtains the supercritical pressure on the high pressure side. In the refrigerating apparatus (R), a refrigerant circuit (1) is formed on the high pressure side by a compressor (11), a gas cooler (46), main reducing means (62A, 62B), evaporators (63A, 63B). The refrigerating apparatus (R) comprises an oil separator (44) for separating the oil from the refrigerant sprayed from the compressor (11), an oil return circuit (73), an oil cooler (74), an oil bypass circuit (78),an electromagnetic valve (79) and a control means (C) for controlling these valves to collect a refrigerant circulated through the refrigerant circuit in the tank and discharging the refrigerant to the refrigerant circuit.

Description

technical field [0001] The invention relates to a refrigeration device in which a refrigerant circuit is formed by a compression mechanism, a gas cooler, a throttling mechanism and an evaporator, and the high-pressure side becomes a supercritical pressure. Background technique [0002] At present, in this kind of refrigeration device, a refrigeration cycle is composed of a compression mechanism, a gas cooler, and a throttling mechanism. , thus using the evaporation of the refrigerant at that time to cool the surrounding air. In recent years, it has been impossible to use Freon-based refrigerants in such refrigerators due to natural environmental problems and the like. Therefore, a refrigeration device using carbon dioxide, which is a natural refrigerant, as a substitute for Freon refrigerant has been developed. It is known that the carbon dioxide refrigerant is a refrigerant with a large high-pressure difference, its critical pressure is low, and the high-pressure side of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B1/00F25B31/00F25B41/04F25B49/02
CPCF25B49/02F25B2400/04F25B2400/075F25B2400/072F25B2600/25F25B41/20
Inventor 三原一彦佐佐木英孝长谷川说川久保贤大竹雅久
Owner SANYO ELECTRIC CO LTD
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