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refrigeration unit

A refrigeration device and refrigeration machine technology, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problem of low-pressure side pressure drop, achieve the effect of reducing the start-up load, narrowing the valve opening, and preventing abnormal rise

Active Publication Date: 2017-06-13
PANASONIC CORP
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  • Abstract
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Problems solved by technology

[0007] Therefore, in summer, if the opening of the standard valve is too small, the inflow of refrigerant to the evaporator will be blocked at startup, causing the pressure on the high pressure side to rise. Refrigerant, through the excess cooling capacity caused by it, reduces the pressure on the low-pressure side, which has the problem of producing a so-called short cycle in which the compressor stops immediately

Method used

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Embodiment Construction

[0037] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. figure 1 It is a refrigerant circuit diagram of the refrigeration apparatus R of the embodiment to which the present invention is applied. The refrigerating device R in this embodiment is installed in a store such as a supermarket, and has a refrigerating machine 3 and one or more display cabinets 4 (load equipment) in the store. The inlet 7 is connected by refrigerant pipes 8 and 9 to form a predetermined refrigerant circuit 1 .

[0038] The refrigerant circuit 1 uses, as a refrigerant, carbon dioxide whose refrigerant pressure on the high pressure side (high pressure) is equal to or higher than its critical pressure (supercritical). This carbon dioxide refrigerant is an environmentally friendly natural refrigerant in consideration of flammability, toxicity, and the like. In addition, as the lubricating oil, for example, existing oils such as min...

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Abstract

The invention provides a refrigerating device, which can properly control the opening degree of the expansion valve when the compressor is started, and reduce the start-up load. The refrigeration device (R) comprises a compressor (11), a gas cooler (28), an expansion valve (32), and an evaporator (33) to form a refrigerant circuit (1), and its high pressure side becomes a supercritical pressure. A control device for controlling the compressor (11) and the expansion valve (32) is provided, and the control device changes the valve opening degree of the expansion valve (32) when the compressor (11) is started based on the outside air temperature. The control device expands the valve opening of the expansion valve (32) when the temperature of the outside air is high, and reduces the valve opening of the expansion valve (32) when the temperature of the outside air is low.

Description

technical field [0001] The present invention relates to a refrigeration device in which a refrigerant circuit is constituted by a compressor, a gas cooler, an expansion valve, and an evaporator, and the high-pressure side becomes a supercritical pressure. Background technique [0002] At present, this kind of refrigeration device consists of a compressor, a gas cooler, an expansion valve, an evaporator, etc. to form a refrigerant circuit. The refrigerant is evaporated, and the ambient air is cooled by the evaporation of the refrigerant at this time. In recent years, in such refrigerating apparatuses, it is no longer possible to use freon-based refrigerants due to natural environmental problems and the like. Therefore, the use of carbon dioxide, which is a natural refrigerant, is being developed as a substitute for Freon refrigerants. It is known that this carbon dioxide refrigerant is a refrigerant having a large high-pressure difference, has a low critical pressure, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B9/00F25B41/06F25B49/02F25B41/31
Inventor 三原一彦石井武柴田勋男小柴胜真野诚
Owner PANASONIC CORP
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