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Cooling device

A refrigeration device and valve device technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of reduced refrigeration cycle efficiency, reduced cooling capacity of refrigeration devices, poor startup of compression mechanisms, etc., to improve refrigeration capacity and realize performance effect

Active Publication Date: 2011-06-29
SANYO ELECTRIC CO LTD
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Problems solved by technology

Therefore, the pressure in the intermediate-pressure region and the high-pressure region of the refrigerant circuit are close to each other, and the pressure difference between the intermediate-pressure region and the high-pressure region cannot be sufficiently ensured until the compressed state of the refrigerant becomes a poor compression state.
[0005] As a result, there may be problems such as causing poor start of the compression mechanism, significantly reducing the cooling capacity of the refrigeration device, increasing the power of the compression mechanism, and reducing the efficiency of the refrigeration cycle.

Method used

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Embodiment Construction

[0085] 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.

[0086] 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 use...

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Abstract

The invention provides a cooling device (R) which can improve the starting problem of a compressing mechanism and realize a stable and high-efficient operation, wherein a refrigerant circuit (1) is composed of a compressor (11), a gas cooler (46), a main throttle mechanism (62A, 62B), and an evaporator (63A, 63B), and has a supercritical pressure at a high-pressure side. The cooling device (R) comprises a bypass circuit (84) which communicates an intermediate-pressure region and a low-pressure side region of the refrigerant circuit (1); a solenoid valve (85) which is disposed in the bypass circuit; a control mechanism (C) which controls the solenoid valve (85) and opens the flow path of the bypass circuit (84) using the solenoid valve (85) from the starting of the compressor (11) till the operation frequency is increased to a defined value.

Description

technical field [0001] The present invention relates to a refrigeration device in which a refrigerant circuit is constituted 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 type of refrigeration device, a refrigeration cycle is composed of a compression mechanism, a gas cooler, and a throttling mechanism. Evaporation, thereby 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, and has a low critical pressure,...

Claims

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Application Information

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IPC IPC(8): F25B1/00F25B49/02
CPCF25B49/02F25B2400/072F25B2400/075F25B2600/25F25B2400/04F25B41/20
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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