In the vapor compression refrigeration system, the refrigeration compressor raises the refrigerant from low pressure to high pressure, and makes the refrigerant continue to circulate, so that the system continuously discharges internal heat to an environment higher than the system temperature. The refrigeration compressor is the heart of the refrigeration system. The refrigeration system inputs electrical energy through the compressor to discharge heat from a low-temperature environment to a high-temperature environment. The energy efficiency ratio of the refrigeration compressor determines the energy efficiency ratio of the entire refrigeration system. Because the ambient temperature changes frequently, the compressor is in a partial load state most of the time, so the compressor must have energy regulation.
A Helmholtz resonator is closed and connected on the outside of the compressor housing, that is, the cavity of the Helmholtz resonator is connected to the internal cavity of the compressor housing through the hole neck to reduce the amplitude of the excited acoustic mode in the compressor cavity. Modulating the resonance frequency of the resonator to the maximum excited vibration mode of the actual compressor cavity will greatly reduce the resonance peak and cause a significant change in the response spectrum. However, this will affect the appearance of the compressor and its layout in the refrigerator, and its research results have not been applied to products.
As the component that has the greatest impact on the efficiency and reliability of the transcritical carbon dioxide air conditioning system, the compressor should be redesigned in full consideration of the specific characteristics of the carbon dioxide supercritical cycle. Like ammonia, CO2 has a higher adiabatic index K value of 1.30, which may make the compressor discharge temperature higher. However, because CO2 requires a small compressor pressure ratio, there is no need to cool the compressor itself. It is precisely because of the high adiabatic index and low pressure ratio that the re-expansion loss of the compressor clearance volume can be reduced, and the compressor volumetric efficiency is higher. After experimental and theoretical research, Jurgen SUB and Horst Kruse found that reciprocating compressors have good oil film sliding seals and become the first choice for CO2 systems. BOCK has improved the exhaust valve of its carbon dioxide compressor, and the efficiency of the improved carbon dioxide compressor has increased by 7%.
The amount of remaining lubricating oil and the winding of the motor-end coil will also cause the difference in the sound level of the same type of compressors (deviation from the average sound level). By changing the external support of the shell to increase the torsional stiffness and reduce the vibration surface; the complexity of noise research requires researchers to have a strong theoretical quality, requires enterprises to have a good technical foundation, and requires large investment and long time. time. This aspect is one of the weak links of Chinese compressor companies, which are basically in the stage of qualitative experimental research, accompanied by great randomness and contingency. Mechanical Encyclopedia
The application of new refrigerants based on environmental protection requirements is also a hot issue in the refrigeration compressor industry. With the end of the replacement of R22 refrigerant for refrigerator products, research on new refrigerant compressors is mainly concentrated in the air-conditioning industry. In addition to the more mature R410A and R407C research, the biggest hot issue is the research on carbon dioxide compressors. Because the pressure of the carbon dioxide system is much greater than that of the traditional pressure critical cycle system, the design requirements of the compressor shaft seal are much higher than that of the original compressor, and the compressor shaft seal leakage will still be the main reason hindering its practical application for a period of time .
refrigeration compressor in the vapor compression refrigeration system, the refrigerant is raised from low pressure to high pressure, and the refrigerant is continuously circulated, so that the system continuously discharges internal heat to an environment higher than the system temperature. The refrigeration compressor is the heart of the refrigeration system. The refrigeration system inputs electrical energy through the compressor to discharge heat from a low-temperature environment to a high-temperature environment. The energy efficiency ratio of the refrigeration compressor determines the energy efficiency ratio of the entire refrigeration system. Because the ambient temperature changes frequently, the compressor is in a partial load state most of the time, so the compressor must have energy regulation.
A Helmholtz resonator is closed and connected on the outside of the compressor housing, that is, the cavity of the Helmholtz resonator is connected to the internal cavity of the compressor housing through the hole neck to reduce the amplitude of the excited acoustic mode in the compressor cavity. Modulating the resonance frequency of the resonator to the maximum excited vibration mode of the actual compressor cavity will greatly reduce the resonance peak and cause a significant change in the response spectrum. However, this will affect the appearance of the compressor and its layout in the refrigerator, and its research results have not been applied to products.
As the component that has the greatest impact on the efficiency and reliability of the transcritical carbon dioxide air conditioning system, the compressor should be redesigned in full consideration of the specific characteristics of the carbon dioxide supercritical cycle. Like ammonia, CO2 has a higher adiabatic index K value of 1.30, which may make the compressor discharge temperature higher. However, because CO2 requires a small compressor pressure ratio, there is no need to cool the compressor itself. It is precisely because of the high adiabatic index and low pressure ratio that the re-expansion loss of the compressor clearance volume can be reduced, and the compressor volumetric efficiency is higher. After experimental and theoretical research, Jurgen SUB and Horst Kruse found that reciprocating compressors have good oil film sliding seals and become the first choice for CO2 systems. BOCK has improved the exhaust valve of its carbon dioxide compressor, and the efficiency of the improved carbon dioxide compressor has increased by 7%.
The amount of remaining lubricating oil and the winding of the motor-end coil will also cause the difference in the sound level of the same type of compressors (deviation from the average sound level). By changing the external support of the shell to increase the torsional stiffness and reduce the vibration surface; the complexity of noise research requires researchers to have a strong theoretical quality, requires enterprises to have a good technical foundation, and requires large investment and long time. time. This aspect is one of the weak links of Chinese compressor companies, which are basically in the stage of qualitative experimental research, accompanied by great randomness and contingency. Mechanical Encyclopedia
The application of new refrigerants based on environmental protection requirements is also a hot issue in the refrigeration compressor industry. With the end of the replacement of R22 refrigerant for refrigerator products, research on new refrigerant compressors is mainly concentrated in the air-conditioning industry. In addition to the more mature R410A and R407C research, the biggest hot issue is the research on carbon dioxide compressors. Because the pressure of the carbon dioxide system is much greater than that of the traditional pressure critical cycle system, the design requirements of the compressor shaft seal are much higher than that of the original compressor, and the compressor shaft seal leakage will still be the main reason hindering its practical application for a period of time .