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Common Problems And Improvement Of Air SourceHeat Pump Compressor

Nov 25, 2017

Common Problems and Improvement of Air SourceHeat Pump Compressor


Air heat pump system is widely used in hot water, heating, drying and other fields, which is characterized by the fact that most of the heat energy comes from the low-temperature heat energy in the air, so it is more prominent in energy conservation and in line with the concept of environmental protection. However, most of the air source heat pump units are installed outdoors. Due to the influence of the external environment, the working range fluctuates greatly. The unit runs for a long time under non-standard conditions. Under some severe conditions, the air heat pump units may appear Some compressor fault problem. The importance of heat pump compressor is self-evident, is the whole air heat pump system "engine", equivalent to the human heart. So Xiaobian summarizes a number of common compressor problems were analyzed in detail, and put forward the corresponding improvements.


Air heat pump system is widely used in hot water, heating, drying and other fields, which is characterized by the fact that most of the heat energy comes from the low-temperature heat energy in the air, so it is more prominent in energy conservation and in line with the concept of environmental protection. However, most of the air source heat pump units are installed outdoors. Due to the influence of the external environment, the working range fluctuates greatly. The unit runs for a long time under non-standard conditions. Under some severe conditions, the air heat pump units may appear Some compressor fault problem. The importance of heat pump compressor is self-evident, is the whole air heat pump system "engine", equivalent to the human heart. So Xiaobian summarizes a number of common compressor problems were analyzed in detail, and put forward the corresponding improvements.


Air-source heat pump units used in many types of heat pump compressors to fully enclosed piston compressor is common, and fully enclosed piston compressor failure problems, mostly occurred in winter heating operation. Through the failure of some fault compressor anatomical observation of the situation, the heat pump compressor can be roughly divided into three categories:


First, the heat pump compressor suction and exhaust valve rupture


Phenomenon: Compressor oil level is normal, compressor bearings, crankshaft, connecting rod intact, suction and exhaust valve rupture.


Second, the heat pump compressor stall (such failures more)


Phenomenon: compressor oil is black, the upper and lower bearing sleeve off or wear, connecting rod fracture, the crankshaft and bearing friction surface and crankshaft and connecting rod friction surface with traces of wear, the motor rotor wear marks, suction and exhaust valve intact.


Third, the heat pump compressor motor burned


Phenomenon: Compressor insulation to 0, the compressor bearings, crankshaft, connecting rod intact


For the above reasons for heat pump compressor analysis, to give the appropriate improvements:


1. The control should have antifreeze control function (ie in the shutdown state, when the ambient temperature is lower than a certain value, the pump or electric heating should be put into operation to prevent freezing of the water system), while the water system should be provided with drainage Device, when the unit is not in use for a long time, should drain the water within the water exchanger to prevent freezing damage.


2. In order to ensure the normal operation of the unit, the flow switch and various protection switches can not be short-circuited by themselves; when the unit is running, it is necessary to observe frequently and find out when the temperature difference between the water inlet and outlet of the unit is too large, check the water system in time: Whether the pump is normal, water flow and water filter cleaning.


3. increase in the electronic control program to ensure the compression crankcase heater heating time conditions before starting to ensure that the compressor can fully preheat to prevent damage.


4. to improve the defrost method to ensure timely defrosting and defrosting thoroughly improve the reliability of electronic control, to prevent malfunction or non-action.


5. Improve the system design, especially in the low-temperature heating conditions, the expansion valve and gas-liquid separator should be reasonable match, or take measures to increase the bypass of high and low pressure to prevent back to the unit problem.


6. Improve the technology, strengthen the management and enhance the awareness of quality, ensure that the refrigeration system is clean, clean and free of moisture. The quality of manufacturing and processing is an important factor that affects the quality of generating units. Many problems must be avoided in order to avoid any major failure.


7. to enhance the user's use, operation and maintenance training.