Control method for preventing liquid impact on refrigeration compressor

A technology for refrigeration compressors and control methods, which is applied in refrigerators, refrigeration and liquefaction, pump control, etc., and can solve the problems of not being able to grasp the ratio of the system's return gas to liquid in real time, effectively controlling the liquid sucked by the compressor, and not being able to prevent liquids in a timely and effective manner. Avoid liquid shock phenomenon and other problems to achieve the effect of preventing liquid shock phenomenon, eliminating potential safety hazards and prolonging service life

Inactive Publication Date: 2011-10-19
YANTAI TONGDA REFRIGERATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the proportion of liquid in the return air of the system cannot be grasped in real time, so it can...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Data acquisition and display: Collect the suction pressure P in the return air pipeline of the refrigeration system through the pressure sensor 0 It is 0.381MPa (absolute pressure), and the pressure value is displayed on the monitor in real time. Collect the suction temperature T in the return air pipeline of the refrigeration system through the temperature sensor 1 It is 0°C, and the temperature value is displayed on the display in real time.

[0018] Calculation of superheat: First, the controller calculates the P 0 Corresponding evaporation temperature T 0 =-8°C, (the refrigerant used in this system is R22).

[0019] Superheat ΔT=T 1 -T 0 =8°C; real-time display of ΔT through the monitor;

[0020] Control: set the superheat value K to 6°C, at this time, because ΔT is greater than K, the compressor operates normally.

Embodiment 2

[0022] Data acquisition and display: Collect the suction pressure P in the return air pipeline of the refrigeration system through the pressure sensor 0 It is 0.381MPa (absolute pressure), and the pressure value is displayed on the monitor in real time. Collect the suction temperature T in the return air pipeline of the refrigeration system through the temperature sensor 1 It is -3°C, and the temperature value is displayed in real time on the display.

[0023] Calculation of superheat: First, the controller calculates the P 0 Corresponding evaporation temperature T 0 =-8°C, (the refrigerant used in this system is R22).

[0024] Superheat ΔT=T 1 -T 0 =5°C; real-time display of ΔT through the monitor;

[0025] Control: Set the superheat value K to 6°C. At this time, because ΔT is less than K, the controller sends an alarm signal for low superheat, and displays the alarm status through the display.

[0026] If the duration of ΔT less than K exceeds the set delay time of 20...

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PUM

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Abstract

The invention relates to a control method for preventing liquid impact on a refrigeration compressor, which comprises the following steps that: suction pressure and a suction temperature are detected and displayed in real time; and a controller calculates a suction superheat degree value according to the detected suction pressure and suction temperature, displays the suction superheat degree value in real time, compares the suction superheat degree value with a set superheat degree value, controls to send an alarm signal and displays an alarm state through a display when the suction superheat degree value is smaller than the set value, and controls to stop operating the compressor and displays the operating state of the compressor through the display when the suction superheat degree value is continuously too low and exceeds a delay time set value. By the method, the phenomenon of the liquid impact on the compressor can be effectively avoided, the potential safety hazard of the compressor under the operating working condition is eliminated, the safety factor of the compressor is improved, and the service life of the compressor is prolonged.

Description

technical field [0001] The invention relates to a control method for preventing liquid shock of a compressor applied to a dry evaporation system in the field of refrigeration. Background technique [0002] In the dry evaporative refrigeration system, the frosting of the evaporator is serious to a certain extent, the fan of the evaporator fails to operate, the cooling capacity output by the compressor is greater than the heat exchanged by the evaporator, the matching between the two is unreasonable, and the throttle expansion of the evaporator If the valve fails, the refrigerant in the evaporator of the refrigeration system cannot be fully evaporated, and part of the unevaporated refrigerant liquid is sucked into the compressor. Because the liquid cannot be compressed, it will cause mechanical damage to the compressor and hidden dangers of failure. In severe cases, the compressor cannot continue to operate and seriously affect the service life of the compressor. This phenome...

Claims

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Application Information

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IPC IPC(8): F04B49/06F25B49/02
Inventor 张华东董学超
Owner YANTAI TONGDA REFRIGERATION EQUIP
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