Electric refrigerating unit for refrigerated vehicle

Abstract

The invention discloses an electric refrigerating unit for a refrigerated vehicle. The electric refrigerating unit is characterized in that a full-closed variable frequency refrigerating compressor is arranged in a refrigerating circulating system, and the full-closed variable frequency refrigerating compressor is driven by output electrical energy of a variable frequency controller; the input end of the variable frequency controller has three selective power supply modes, respectively a vehicle engine drives a generator through a mechanical transmission mechanism to supply power, a storage battery supplies power directly, and a power supply interface is connected with the mains or other external power supply to supply power; and the variable frequency controller is used for converting the electrical energy input by the three selective power supply modes, and the conversion is used for regulating the frequency and voltage of an output alternating current according to the thermal load of the refrigerated vehicle to drive the full-closed variable frequency refrigerating compressor to run at variable revolving speeds, so that the refrigerating capacity of the refrigerating unit is matched with the thermal load of the refrigerated vehicle. The refrigerating unit has the functions of independent and direct-coupled refrigerating units for road transportation, is not provided with a fuel oil engine and a motor which are necessary for the independent refrigerating unit, and has the advantages of wide temperature regulating range, compact structure, miniaturization, energy conservation and environmental friendliness.

Description

technical field [0001] The invention relates to a refrigerating unit for a refrigerated vehicle, in particular to an electric refrigerating unit for a refrigerated vehicle that can flexibly use multiple power input modes, including an engine, a motor, a storage battery and an external power supply. Background technique [0002] Refrigeration unit is the core equipment of refrigerated transport vehicles. It widely adopts vapor compression refrigeration technology, and uses the heat absorption and heat release when the refrigerant phase changes to keep the compartment at an appropriate storage temperature. Refrigeration units for refrigerated transportation are divided into independent type and direct connection type. The independent type refrigeration unit needs to be equipped with a special fuel engine and electric motor. During driving and parking, it is driven by a special engine and an external power supply, and the open refrigeration compressor is driven by a belt transmi...

AI Technical Summary

Problems solved by technology

[0003] The self-contained refrigerating unit is suitable for medium, long and short-distance refrigerated transportation due to its self-contained fuel engine, electric motor and its mechanical transmission mechanism, but the system has complex structure, large volume and mass, and high cost. The technical difficulty is high, and the power output of the fuel engine is relied on during driving, which has low efficiency and serious emission pollution; the direct-connected refrigeration unit is only suitable for medium and short-distance refrigerated transportation with small cooling capacity, and the refrigeration compressor is driven by the vehicle engine through a pulley. The rotation speed changes with the driving speed of the car, making it difficult to adjust the load

These two types of refrigerating units for refrigerated transportation use open-type refrigeration compressors, which have the disadvantage of refrigerant leakage; for the direct-connected system, the main engine must run at idle speed to drive the refrigerating unit when parking on the way, which has high energy consumption and high emissions. Prominent problem

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