As a combination of compressor and other refrigeration equipment, the condensing unit for cold room integrates the core components into a system that can be directly used by users and plays a key role in the integration of refrigeration components. In recent years, with the continuous prosperity of China's refrigeration industry, industrial and commercial condensing units have been fully developed both in technology and market capacity. To meet the needs of different users, the condensing unit manufacturers have developed various products based on their advantages. As the market continues to mature, the condensing unit will continue to develop in the future in the direction of high efficiency and environmental protection, multi-machine parallel connection, energy-saving frequency conversion, etc. At present, the application field of the condensing unit is very broad, including light commercial, large-scale commercial and industrial fields. Among them, cold storage, supermarket, quick freezing, medicine, ice making, cold chain transportation, and petrochemical industry are the important application industries of condensing units, which involve all aspects of economic life.