Refrigerator system for store

A technology for refrigerators and shops, applied in the direction of refrigerators, refrigerators, household refrigeration devices, etc., can solve the problems of amplifying vibration and noise, amplification, etc., to reduce vibration and noise, stabilize the temperature of exhaust gas, and reduce restrictions.

Inactive Publication Date: 2003-10-01
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it cannot operate fully and precisely with high accuracy over a wide range of capacities;
[0006] (2). Although the high-pressure discharge gas discharged from the compressor fluctuates greatly, the fluctuation is sometimes further amplified when the compressor speed is changed by the converter
Therefore, there are many restrictions in arranging the refrigerant pipes in order to prevent the sound

Method used

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  • Refrigerator system for store
  • Refrigerator system for store

Examples

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Example Embodiment

[0029] Some concepts of the present invention can be summarized as follows.

[0030] (1) A screw compressor without reciprocating motion is used. The driving method is to control the speed by detecting the operating suction pressure and changing the frequency of the converter. It is installed in a special mechanical room.

[0031] (2) The liquid injection volume is controlled according to the temperature and pressure of the discharge gas from the screw compressor. The liquid refrigerant is injected into a compression chamber near a discharge port, and communicates with each other once during one rotation movement of the rotating spiral cladding of the screw compressor.

[0032] (3) The inventive refrigerant system can identify faults, such as an abnormal increase in the temperature of the converter, and when such a fault occurs, the power supply of the screw compressor can be connected to a commercial power supply.

[0033] (4) Provide a mode for operating the compressor at a fixe...

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Abstract

The present invention relates to a refrigerator system for shops, which can be operated according to the load capacity, and can precisely control the temperature fluctuation in the horizontal plane to be extremely small, can reduce noise and space, and is convenient for trial operation, Repair and troubleshoot. A screw compressor without reciprocating motion is used. It is installed in the mechanical room, and controls the speed of the compressor by detecting the operating suction pressure and changing the inverter frequency. It can judge faults, such as abnormal temperature rise of the converter; when a fault occurs, it can be switched to commercial power. The pressure and temperature of each part that reflect the operating status are displayed digitally, and the cause of abnormal stop is also displayed.

Description

[0001] The present invention is a divisional application of an invention patent application filed on March 29, 1996, with the application number 96102801.7 and the invention title "Refrigerator System for Stores". Technical field [0002] The present invention relates to a refrigerator system for stores; more specifically, it relates to a refrigerator suitable for connecting 5 to 7 small-capacity showcases (refrigerated cabinets) to a refrigerator System, as seen in convenience stores. Background technique [0003] As an example, a system is described in Japanese Patent Laid-open No. 60-175970. In this system, an air-cooled condenser section is installed outdoors, a compressor section is installed in the indoor machine room, and An inverter is used to change the speed of the compressor to control its capacity to suppress the decrease in its refrigeration capacity. [0004] Many prior art refrigerator systems use an inverter and a reciprocating compressor with reciprocating motion,...

Claims

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Application Information

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IPC IPC(8): F25D11/00F25B1/00F25B5/02F25B49/02
CPCF25B2400/22
Inventor 菊地昭治青柳正晃太田和昌宫友明
Owner HITACHI LTD
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