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Operation method of two-stage-throttling intermediate complete cooling type refrigeration system and two-stage-throttling intermediate complete cooling type refrigeration system

A technology of secondary throttling and refrigeration system, applied in the field of two-stage compression refrigeration system and refrigeration system, can solve the problems of compressor shock, reduced defrosting efficiency, slow defrosting speed, etc., to improve service life, flexible and convenient to use , The effect of high defrosting efficiency

Active Publication Date: 2018-10-26
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this defrosting method operates a single-stage compression heat pump cycle during defrosting, when the two-stage compression refrigeration cycle is converted to a single-unit compression heat pump defrosting cycle, the working pressure difference of the compressor participating in the single-stage compression heat pump cycle defrosting increases sharply, which will cause Impact on the compressor, damage the compressor, and this single-stage compression heat pump defrosting cycle enters the evaporator for defrosting, the temperature of the working medium is low, the defrosting speed is slow, and the time for heat diffusion around the evaporator is long, resulting in a decrease in defrosting efficiency In addition, when defrosting the evaporator, a large amount of liquid working fluid condensed by the evaporator flows into the gas-liquid separator. After long-term accumulation, these liquid working fluids are easily sucked by the low-pressure stage compressor, forming a wet compression of the compressor, resulting in Compressor damage, resulting in economic loss
[0005] In addition, the existing cold storage generally can only achieve a single cooling temperature, and the cooling capacity of the cold storage room or the freezing room is provided according to the needs of use, which is inconvenient to use

Method used

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  • Operation method of two-stage-throttling intermediate complete cooling type refrigeration system and two-stage-throttling intermediate complete cooling type refrigeration system
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  • Operation method of two-stage-throttling intermediate complete cooling type refrigeration system and two-stage-throttling intermediate complete cooling type refrigeration system

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Effect test

Embodiment 1

[0039] The schematic diagram of the structure of the full-liquid secondary throttling intermediate completely cooled refrigeration system for hot gas defrosting of the present invention is as follows: figure 1 As shown, it includes a high-pressure stage compressor group, a condenser 5, a first throttle valve 4-1, an intercooler 3 and multiple groups of low-pressure stage units. In this embodiment, the high-pressure stage compressor group includes one or more high-pressure stage compressors 1-2. When multiple high-pressure stage compressors 1-2 are used, the The suction port is connected in parallel as the suction end of the high pressure stage compressor group, and the exhaust port of each of the high pressure stage compressors 1-2 is connected in parallel as the discharge end of the high pressure stage compressor group. The low-pressure stage unit can be used for a refrigeration cycle or a defrosting cycle, and each of the low-pressure stage units includes a low-pressure stag...

Embodiment 2

[0043] The schematic diagram of the structure of the full-liquid secondary throttling intermediate completely cooled refrigeration system for hot gas defrosting of the present invention is as follows: figure 2 As shown, it includes a high-pressure stage compressor group, a condenser 5, a first throttle valve 4-1, an intercooler 3 and multiple groups of low-pressure stage units. In this embodiment, the high-pressure stage compressor group includes one or more high-pressure stage compressors 1-2. When multiple high-pressure stage compressors 1-2 are used, the The suction port is connected in parallel as the suction end of the high pressure stage compressor group, and the exhaust port of each of the high pressure stage compressors 1-2 is connected in parallel as the discharge end of the high pressure stage compressor group. The low-pressure stage units can be used in a refrigeration cycle or a defrosting cycle, and each of the low-pressure stage units includes a low-pressure sta...

Embodiment 3

[0047] The structure principle diagram of the non-full liquid type secondary throttling intermediate complete cooling refrigeration system for high-temperature hot gas defrosting of the present invention is as follows: image 3 As shown, it includes a high-pressure stage compressor unit, a condenser 5, a first throttle valve 4-1, an intercooler 3, a third four-way reversing valve 2-3 and a plurality of low-pressure stage units. In this embodiment, the high-pressure stage compressor group includes one or more high-pressure stage compressors 1-2. When multiple high-pressure stage compressors 1-2 are used, the The suction port is connected in parallel as the suction end of the high pressure stage compressor group, and the exhaust port of each of the high pressure stage compressors 1-2 is connected in parallel as the discharge end of the high pressure stage compressor group. The low-pressure stage unit can be used in a refrigeration cycle or a defrosting cycle, and each low-pressu...

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Abstract

The invention discloses an operation method of a two-stage-throttling intermediate complete cooling type refrigeration system and the two-stage-throttling intermediate complete cooling type refrigeration system. The operation method of the two-stage-throttling intermediate complete cooling type refrigeration system and the two-stage-throttling intermediate complete cooling type refrigeration system aim to achieve that a low-pressure-grade compressor heat pump circulation is used for wheel gear defrosting of low-temperature evaporators. An intermediate temperature evaporator and a low-temperature evaporator are arranged in each low-pressure-grade unit, wherein the intermediate temperature evaporator is used for achieving intermediate temperature refrigeration, and the low-temperature evaporator is used for achieving low-temperature refrigeration or defrosting. The operation method comprises the steps that when one low-temperature evaporator needs defrosting, through valve switching, a low-pressure-grade compressor having the defrosting function is converted into a high-pressure-grade compressor to operate, the low-pressure-grade compressor in the low-pressure-grade unit achieving the defrosting function sucks a working medium from the low-pressure-grade compressor achieving the refrigeration function, after the working medium is compressed, the working medium condenses to heat the low-temperature evaporator to be defrosted, and then defrosting is achieved; when multiple low-temperature evaporators need defrosting, wheel gear type defrosting is adopted. According to the two-stage-throttling intermediate complete cooling type refrigeration system and the two-stage-throttling intermediate complete cooling type refrigeration system, the defrosting circulation and the refrigeration circulation are both double-grade compression circulations, the temperature fluctuation of a cold storage is small, the structure is simple, and the efficiency is high.

Description

technical field [0001] The invention relates to the technical field of refrigeration, and more particularly, to an operation method and a refrigeration system of a two-stage compression refrigeration system with intermediate temperature evaporator and secondary throttling intermediate complete cooling using heat pump defrosting. Background technique [0002] In the cold storage, when the cooling surface of the heat exchanger is covered by a frost layer, if it is not removed in time, the frost accumulation will reduce the suction temperature of the compressor, increase the exhaust temperature, and block the air passage, reduce the heat transfer area, and reduce the air flow rate. The flow resistance increases significantly, the heat exchange efficiency decreases sharply, and the operation performance of the refrigeration unit decreases. The pros and cons of the defrosting effect are also the key to give full play to the equipment capacity of the cold storage, reduce overhaul ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B13/00F25B41/00F25B47/02F25B41/42
CPCF25B13/00F25B47/02F25B41/40Y02B30/70
Inventor 杨永安李瑞申
Owner TIANJIN UNIV OF COMMERCE
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