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Control method and system of improving running reliability of compressor

A compressor and reliability technology, applied in pump control, mechanical equipment, machine/engine, etc., can solve problems such as wear, evaporator cannot evaporate refrigerant immediately, and oil film cannot be formed, so as to improve operation reliability and avoid unit operation The effect of reduced reliability

Active Publication Date: 2015-03-11
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the thermal expansion valve is improperly selected or used, or when the unit is started to operate when the internal and external ambient temperature is low, the evaporator cannot immediately evaporate a sufficient amount of refrigerant, and the thermal expansion valve cannot immediately adjust the opening, so the unit flooded operation
When the unit is running with liquid, the refrigerant liquid dilutes the lubricating oil in the unit, and the oil viscosity decreases, so that the oil film cannot be formed on the friction surfaces of the compressor, resulting in rapid wear of the moving parts and reducing the operating reliability of the compressor.

Method used

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  • Control method and system of improving running reliability of compressor
  • Control method and system of improving running reliability of compressor

Examples

Experimental program
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Embodiment 1

[0046] The first embodiment discloses a control method for improving the operation reliability of the compressor.

[0047] Based on the research on the characteristics of the working conditions that are likely to lead to the liquid-laden operation of the compressor, the applicant pre-determined various reference information that can reflect the liquid-laden situation of the compressor: the suction superheat of the unit, the exhaust superheat and the liquid injection valve Liquid spraying conditions; and on this basis, formulate corresponding liquid-carrying early warning conditions (when there is a liquid-carrying hazard) or shutdown protection conditions (once entering liquid-carrying operation), and follow-up can be carried out on the compressor unit according to the formulated conditions. Corresponding control to improve the operating reliability of the unit.

[0048] The method of the present invention is described in detail below, with reference to figure 1 , the method ...

Embodiment 2

[0065] In the second embodiment, refer to figure 2 , the method may also include the following steps:

[0066] S105: After issuing the liquid-carrying warning command and controlling the corresponding warning device to give a warning, if it is detected that the suction superheat of the compressor is A≥T 1 +ΔT, an early warning stop instruction is issued to control the early warning device to stop the alarm, wherein ΔT is a preset temperature change value.

[0067] That is to say, after the early warning device gives an early warning, if the suction superheat of the compressor recovers to a certain extent and reaches a reasonable value, for example, A≥T 1 At +5°C, at this time, the value of suction superheat is relatively moderate, which eliminates the hidden danger of compressor running with liquid. Therefore, in this case, a corresponding early warning stop command can be issued to eliminate the alarm.

Embodiment 3

[0069] Embodiment 3 discloses a control system for improving the operating reliability of a compressor, and the system corresponds to the methods disclosed in Embodiment 1 and Embodiment 2.

[0070] First, corresponding to Embodiment 1, refer to image 3 , the system includes an acquisition module 100 , a first calculation module 200 , a second calculation module 300 and a control module 400 .

[0071] The obtaining module 100 is used to obtain the suction temperature and suction pressure of the compressor suction port in real time, the discharge temperature and discharge pressure of the compressor discharge port in real time, and the liquid injection situation of the liquid injection valve of the compressor in real time .

[0072] The first calculation module 200 is configured to calculate the suction superheat of the compressor in real time according to the suction temperature and suction pressure.

[0073] Wherein, the first calculation module 200 includes a first acquisi...

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PUM

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Abstract

The invention provides a control method of improving the running reliability of a compressor and a control system of improving the running reliability of the compressor. Based on the research of the characteristics of working conditions likely to cause the liquid-carrying running of the compressor, the reference information capable of reflecting the liquid-carrying circumstance of the compressor can be preliminarily determined; moreover, corresponding liquid-carrying pre-warning conditions (in the existence of liquid-carrying hidden danger) or shutdown protection conditions (once in the liquid-carrying running state) are formulated; on the basis, the reference information capable of reflecting the liquid-carrying circumstance of the compressor, for example, the suction gas superheat of the compressor, the gas discharge superheat of the compressor and the liquid injection of a compressor liquid injection valve are obtained in real time; moreover, when the obtained reference information meets the formulated pre-warning conditions or the shutdown protection conditions, a corresponding control instruction is given to realize liquid-carrying pre-warning or shutdown protection control. According to the method and the system, when the compressor has the liquid-carrying hidden danger or is once in the liquid-carrying running state, the corresponding liquid-carrying pre-warning or the shutdown protection control can be implemented in real time; therefore the problem of low running reliability, caused by liquid-carrying running, of a unit is avoided.

Description

technical field [0001] The invention belongs to the technical field of compressor unit control, and in particular relates to a control method and system for improving the operating reliability of a compressor. Background technique [0002] During the operation of the air-cooled condensing compressor unit, the suction superheat of the compressor is adjusted and controlled by the thermal expansion valve. [0003] When the thermal expansion valve is improperly selected or used, or when the unit is started to operate when the internal and external ambient temperature is low, the evaporator cannot immediately evaporate a sufficient amount of refrigerant, and the thermal expansion valve cannot immediately adjust the opening, so the unit It is very likely to run with liquid. When the unit is running with liquid, the refrigerant liquid dilutes the lubricating oil in the unit, and the oil viscosity decreases, so that the oil film cannot be formed on the friction surfaces of the comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B49/10F04B49/06
Inventor 李庆李金奎刘婷卫广穹何海波
Owner GREE ELECTRIC APPLIANCES INC