The core problem of compressor oper
Common fault solutions and improvement measures of air energy heat pump compressor
The air energy heat pump system is widely used in hot water, heating, drying and other fields. Its characteristic is that most of the heat energy comes from the low temperature heat energy in the air energy, so it is more prominent in energy saving and conforms to the concept of environmental protection. However, most of the air source heat pump units are installed outdoors and are affected by the external environment. The working range fluctuates greatly. The unit runs for a long time under non-standard working conditions. Under some harsh working conditions, air energy heat pump units may appear Some compressor malfunctions. The importance of the heat pump compressor is self-evident. It is the "engine" of the entire air energy heat pump system, equivalent to the human heart. So the editor of okmarts.com summarized some common compressor failures and analyzed them in detail, and proposed corresponding improvement measures.
Air energy heat pump system is widely used in hot water, heating, drying and other fields. Its characteristic is that most of the heat energy comes from the low temperature heat energy in the air energy, so it is more prominent in energy saving and conforms to the concept of environmental protection. However, most of the air source heat pump units are installed outdoors and are affected by the external environment. The working range fluctuates greatly. The unit runs for a long time under non-standard working conditions. Under some harsh working conditions, air energy heat pump units may appear Some compressor malfunctions. The importance of the heat pump compressor is self-evident. It is the "engine" of the entire air energy heat pump system, equivalent to the human heart. Therefore, the editor summarized some common compressor failures and analyzed in detail, and proposed corresponding improvement measures.
Air source heat pump units use many types of heat pump compressors, with hermetic piston compressors as common ones, and the failure of hermetic piston compressors mostly occurs during heating operation in winter. By observing the anatomy of some faulty compressors, the faults of heat pump compressors can be roughly divided into three categories:
One, the heat pump compressor suction and exhaust valve is broken
Phenomenon: The compressor oil level is normal, the compressor bearings, crankshaft, and connecting rod are intact, and the suction and exhaust valves are broken.
2. The heat pump compressor is blocked (there are many such failures)
Phenomenon: Compressor refrigerating oil is black, upper and lower bearing sleeves are off or worn, connecting rod is broken, friction surface between crankshaft and bearing and friction surface between crankshaft and connecting rod have traces of roughness, traces of wear on motor rotor, suction and exhaust valve intact.
3. The heat pump compressor motor burns out
Phenomenon: the compressor’s ground insulation is 0, and the compressor’s bearings, crankshaft and connecting rod are intact
In view of the above analysis of the heat pump compressor, corresponding improvement measures are given:
(1) There should be an antifreeze control function in the control (that is, in the shutdown state, when the ambient temperature is below a certain value, the water pump or electric heating should be put into operation to cause the waterproof system to freeze), and the water system should be equipped with drainage When the unit is not used for a long time, the water in the water exchanger should be drained to prevent freezing damage.
(2) In order to ensure the normal operation of the unit, the flow switch and various protection switches cannot be short-circuited privately; when the unit is running, frequent observations should be made. If the temperature difference between the inlet and outlet water of the unit is too large, the water system should be checked in time: Whether the water pump is normal, the water flow and cleaning the water filter.
(3) In the electronic control program, the condition to ensure the heating time of the compressed crankcase heater before starting up is added to ensure that the compressor can fully warm up to prevent damage.
(4) Improve the defrosting method to ensure timely and thorough defrosting, improve the reliability of electronic control, and prevent malfunction or non-operation.
(5) Improve system design, especially in low temperature heating conditions, should reasonably match expansion valves and gas-liquid separators, or take measures such as increasing high and low pressure bypasses to prevent the liquid back problem of the unit.
(6) Improve the process, strengthen management and enhance quality awareness, to ensure that the refrigeration system is clean and free of moisture. The quality of manufacturing and processing is an important factor affecting the quality of the unit. Many problems must be prevented before they occur to avoid major failures.
(7) Strengthen user training on use, operation and maintenance.
