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Refrigerating device

A refrigeration device and compressor technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as the mismatch between control capacity, load capacity and operating capacity, and save energy and reduce changes in operating capacity. Effect

Inactive Publication Date: 2006-12-27
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned prior art, since the drive frequency of the inverter is lowered or the inverter drives the compressor to stop for a predetermined time in response to load fluctuations, it is difficult to control the capacity very finely in response to changes in the load, and the load capacity is related to the operation. Capacity may not match

Method used

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Embodiment Construction

[0029] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0030] figure 1 It shows an example of the basic refrigeration cycle of the refrigeration apparatus in one embodiment. figure 1 Among them, 1a, 1b, and 1c are each a scroll compressor, 1a is an inverter compressor, 1b, 1c are constant speed compressors, and other than that, condenser 2, liquid accumulator 3, and expansion valve 4 , the main equipment of the evaporator 5 forms a refrigeration cycle. In addition, a pressure sensor 6 is installed on the pipeline on the input side of the compressor, and the suction pressure value detected by the pressure sensor 6 is processed in the unit controller 7 to determine the operating capacity at that moment.

[0031] The unit controller 7 outputs the instruction of the operation frequency of the compressor 1a to the inverter 8, and outputs the operation instructions of the constant speed compressors 1b and 1c respectively to t...

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Abstract

A refrigerating unit capable of optimum operation with respect to load by finely changing the operating capacity in response to changes in load, and offering energy saving effects. The refrigerating unit has a scroll type inverter-driven compressor and scroll type constant-speed compressors; a pressure sensor installed on the suction side; a circuit for starting the inverter-driven compressor first; and a circuit for deciding the driving frequency of the compressor and the number of constant-speed compressors to operate, based on a suction pressure value detected by the pressure sensor after the compressor was started.

Description

technical field [0001] The present invention relates to a refrigerating apparatus in which a plurality of compressors are mounted in parallel and whose capacities are controlled according to loads, and more particularly relates to a refrigerating apparatus having an inverter-driven compressor and a constant-speed compressor. Background technique [0002] Conventionally, in refrigeration equipment equipped with an inverter-driven compressor and a constant-speed compressor, it is known that after the drive frequency of the inverter compressor reaches the highest frequency, if the load is further increased, the constant-speed compressor also operates and does not operate. Reducing the driving frequency of the inverter, especially in Japanese Patent Laid-Open No. 09-273819, it is shown that the inverter-driven compressor is stopped for a predetermined time when the operation of the inverter-driven compressor and the constant-speed compressor are switched, A technology that impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B5/02F25B49/02F25B1/00F04C23/00F04C28/06F04C28/08F25B1/04
CPCF25B49/022F25B2700/193F25B2600/021F25B2400/075F25B49/025Y02B30/741F25B5/02F25B1/04F04C23/001F04C28/06F04C2240/403F04C28/08Y02B30/70F25B2313/0291F25B2700/1933
Inventor 宇野正记服部尚树
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC