The working principle of refrigerated truck refrigeration unit

- Aug 19, 2020-

The working principle of refrigerated truck refrigeration unit

The refrigeration unit of the refrigerated truck is divided into a non-independent unit and an independent unit. The non-independent unit of the refrigerated truck is specially designed for low temperature and medium temperature applications of single-carriage vans and medium trucks. Independent units are mostly used for large trucks and semi-trailers.

The refrigeration unit is operated by the truck engine to drive the compressor to perform refrigeration and defrost. According to user needs, a compressor driven by an electric motor can be selected to operate for refrigeration and defrosting (referred to as an electric backup device). The system consists of at least three independent components: condenser, evaporator and compressor. The compressor is mounted on and driven by the truck engine. Use refrigeration hoses or pipes to connect condensers, evaporators, compressors and other components. The back-up device also has another compressor, an electric motor, and an oil separator, etc., to prepare for power-driven operation. The engine compressor is driven by the engine through a belt. The power-driven compressor and the engine-driven compressor are connected in parallel. The power source drives the compressor through the motor belt. Both the refrigerating unit and the cab air-conditioning compressor use the same refrigeration system circuit.



During operation, the one-way valve isolates the two compressors. The operation of the compressor is controlled by the controller. The device supplies power to the compressor clutch of the refrigerated vehicle or starts the motor when the engine is running, and supplies power to the compressor clutch when the power is driven. The entire refrigeration system is protected by a pressure cut-off switch.


The refrigeration unit is operated by the truck engine to drive the compressor to perform refrigeration and defrost. According to user needs, a compressor driven by an electric motor can be selected for refrigeration and defrosting (referred to as an electric backup device). The system consists of at least three independent components: condenser, evaporator and compressor. The compressor is mounted on and driven by the truck engine. Use refrigeration hoses or pipes to connect the condenser, evaporator, compressor and other components. There is another compressor, an electric motor and an oil separator in the back-up device for power-driven operation. The engine compressor is driven by the engine through a belt. The power-driven compressor and the engine-driven compressor are connected in parallel. The power-driven compressor is driven by a motor belt. Both the refrigerating unit and the cab air-conditioning compressor use the same refrigeration system circuit.




During operation, the one-way valve isolates the two compressors. The operation of the compressor is controlled by the controller. The device supplies power to the compressor clutch of the refrigerated vehicle or starts the motor when the engine is running, and supplies power to the compressor clutch when the power is driven. The entire refrigeration system is protected by a pressure cut-off switch.