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Two-stage compression refrigerating unit for multi-temperature refrigeration storage and control method thereof

A compressor unit and refrigeration unit technology, applied in the direction of compressors, refrigerators, compressors, etc., can solve the problems of frequent load changes in multi-temperature cold storage, uneven load distribution in warehouses, damage to high-pressure compressor units under refrigerant return pressure, etc. Achieve the effects of precise control of oil return temperature, small size, improved work efficiency and service life

Inactive Publication Date: 2020-06-26
ANHUI MELUCK REFRIGERATION EQUIP
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] In order to avoid the shortcomings of the above-mentioned prior art, the present invention provides a two-stage compression refrigeration unit for multi-temperature cold storage and its control method, in order to realize reliable and economical operation of the oil cooling cycle and precisely control the supply of the compressor. Oil temperature, so that each compressor returns oil evenly; and solve the problem that due to frequent and seasonal changes in the multi-temperature cold storage load, the load distribution of each warehouse is uneven, and the high pressure of the refrigerant return air may cause damage to the high-pressure compressor unit

Method used

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  • Two-stage compression refrigerating unit for multi-temperature refrigeration storage and control method thereof
  • Two-stage compression refrigerating unit for multi-temperature refrigeration storage and control method thereof
  • Two-stage compression refrigerating unit for multi-temperature refrigeration storage and control method thereof

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Embodiment Construction

[0047] see figure 1 , figure 2 with image 3 In this embodiment, the two-stage compression refrigeration unit for multi-temperature cold storage includes: a low-pressure compressor unit 2, a high-pressure compressor unit 4, an oil separator 5, a condenser 6, a high-pressure liquid receiver 7, a subcooler 12 and an oil cooler 8 .

[0048] Such as figure 1 As shown, the return air of the cold storage user’s refrigerant is introduced into the gas collection main pipe 1, and the gas collection main pipe 1 is directly connected with the air inlet of the low-pressure compressor unit 2; connected to each other; a pressure sensor 21 and a temperature sensor 22 are set respectively for the gas collecting main pipe 1 .

[0049] The exhaust of the low-pressure compressor unit 2 is connected to the air inlet of the high-pressure compressor unit 4 through the medium-pressure pipeline 3; the exhaust port of the high-pressure compressor unit 4 is connected to the air inlet of the oil se...

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Abstract

The invention discloses a two-stage compression refrigerating unit for a multi-temperature refrigeration storage and a control method thereof. The two-stage compression refrigerating unit comprises alow-pressure compressor unit, a high-pressure compressor unit, an oil separator, a condenser, a high-pressure liquid storage device, a subcooler and an oil cooler. An oil cooling loop of the oil cooler uses the gravity difference between a high-level-energy refrigerant liquid and gas as power, and the reliable and economical oil cooling circulation is achieved; a bypass and a flow regulating valveare arranged between an oil outlet pipeline and an oil return main pipeline of the oil separator to accurately control the oil supply temperature of a compressor; and two different working modes areset to solve the problem that due to the frequent changes and the seasonal changes of the load of each storehouse of the multi-temperature refrigeration storage, the too high return air pressure of arefrigerant possibly occur to easily cause the damage of the high-pressure compressor unit.

Description

technical field [0001] The invention relates to the field of refrigeration and low temperature engineering, in particular to a two-stage compression refrigeration system for multi-temperature cold storage widely used in the cold chain logistics industry and a control method thereof. Background technique [0002] In the refrigeration compressor, the lubricating oil plays the role of lubrication, cooling, sealing and cleaning; the temperature of the lubricating oil rises during the operation of the compressor. Excessively high lubricating oil temperature will cause the performance index of the lubricating oil to attenuate, the lubricating effect is weakened, and the sealing In severe cases, it will cause excessive wear of the compressor, shorten the working life, or damage the compressor. Therefore, the lubricating oil discharged from the compressor must be cooled to maintain the best oil supply temperature for the compressor. System reliability and work efficiency are very im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25D13/04F25D19/00F25D29/00F25B1/10F25B40/02F25B41/04F25B43/02F25B49/02F25B31/00F25B43/00F25B41/20
CPCF25D13/04F25D19/00F25D29/001F25D29/005F25B1/10F25B31/004F25B31/006F25B40/02F25B43/02F25B43/006F25B49/02F25B2700/197F25B41/20
Inventor 江文彬刘德雄王铁军张敬超刘人林何鹏胡远洋
Owner ANHUI MELUCK REFRIGERATION EQUIP
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