Vapor compression type refrigerating machine
A compressor, compression technology, applied in the direction of compressors, compressors, refrigerators, etc., can solve problems such as increased current
Inactive Publication Date: 2009-06-10
DENSO CORP
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0020] However, when a normally closed valve is used as the bypass valve 81, since the bypass valve 81 needs to be energized until the vapor compression refrigerator is restarted after it has been stopped, the dark current, that is, the At the same time, the current consumed will increase
Method used
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Embodiment Construction
[0035] In an embodiment of the present invention, the ejector cycle according to the present invention is applied to a vapor compression refrigerator that needs to be lowered in cabinets for keeping food and beverages under refrigerated and frozen conditions, or with The temperature in the refrigerated container of the refrigerated means for transporting food and beverages kept under refrigerated and frozen conditions lower than the temperature of the air conditioner.
[0036] The compressors 10a, 10b suck and compress the refrigerant by obtaining energy from the electric motor, and these two compressors 10a, 10b are arranged in parallel with respect to the flow of the refrigerant. Note that when the compressors 10a, 10b are collectively referred to, they will be described as the compressor 10, but when the individual compressors need to be described separately, they will be described as the compressor 10a or the compressor 10b.
[0037] The condenser 20 is a high-pressure sid...
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A bypass valve 81 is opened until a predetermined period of time elapses after compressors 10a, 10b are stopped so as to equalize the pressure of a refrigerant circuit on a condenser 20 side with the pressure of a refrigerant circuit on an evaporator 30 side and, after the bypass valve 81 is closed, at least either of a refrigerant circuit 91 connecting to the compressor 10aand a refrigerant circuit 92 connecting to the compressor 10b is opened by opening a three-way valve 90 so that the refrigerant circuit on the condenser 20 side is made to communicate with the refrigerant circuit on the evaporator 30 side via the compressor 10 whereby, as the pressure equalized state can be maintained, it is possible to prevent the accumulation of a large amount of refrigerating machine oil on suction sides of the compressors 10 while the compressors 10 are stopped, thereby making it possible to prevent damage to the compressors 10 due to excessive compression when activated.
Description
technical field [0001] The present invention relates to the transfer of heat on the low temperature side to the high temperature side in a refrigerator, a vapor compression refrigerator with multiple compressors, which is very efficient when applied to an ejector cycle. Background technique [0002] The ejector cycle is a cycle used in vapor compression refrigerators in which the pressure of the refrigerant is reduced by the ejector, causing the refrigerant to expand, drawing vapor-phase refrigerant that has been vaporized by the evaporator into the ejector device, and increase the suction pressure of the compressor by converting expansion energy into pressure energy (for example, refer to Japanese Unexamined Patent Publication No. 6-11197). [0003] Incidentally, in a vapor compression refrigerator in which the pressure of the refrigerant is reduced by a decompression unit such as an expansion valve according to the isenthalpic method (hereinafter, referred to as an expansi...
Claims
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IPC IPC(8): F25B41/00F25B1/00F25B9/08F25B31/00F25B43/02
CPCF25B2400/23F25B2400/0401F25B2700/171F25B31/004F25B2500/26F25B2500/27F25B41/00F25B2700/21175F25B2600/2501F25B2341/0012F25B2400/075
Inventor 西嵨春幸武内裕嗣池本彻松永久嗣
Owner DENSO CORP