The refrigeration system of electric vehicle air conditioners is basically the same as that of traditional vehicles. It mainly consists of integrated compressors, condensers, expansion valves, evaporators, liquid storage dryers and other components. In addition, an air conditioning driver for the electrical system is also added. The use of scroll compressors with high pumping efficiency is a common feature of electric vehicle air conditioners. Compared with many other types of air conditioning compressors (such as swash plate type, crank connecting rod type, vane type, etc.), the scroll compressor Rotary compressors have many advantages such as small vibration, low noise, long service life, light weight, high speed, high efficiency, small appearance and size, etc., and are more in line with the air conditioning requirements of electric vehicles.
The scroll compressor includes a fixed scroll and a movable scroll. The two intermeshing scrolls have the same linear shape. They are installed 180° offset from each other, that is, the phase angles differ by 180°. The working principle of the scroll compressor is that the fixed scroll is fixed on the frame, and the movable scroll is directly driven by the electric motor. The movable scroll cannot rotate on its own and can only make a revolution around the fixed scroll with a small radius of rotation. When the drive motor rotates to cause the movable scroll to revolve, the refrigerant gas is sucked into the peripheral part of the fixed scroll through the filter element. As the drive shaft rotates, the movable scroll rotates according to the trajectory in the fixed scroll, causing the movable scroll and the fixed scroll to rotate. A cavity whose volume gradually decreases from outside to inside is formed. The refrigerant gas is gradually compressed in the six-month crescent-shaped compression cavity composed of the moving and fixed plate. Finally, the compressed refrigerant gas is continuously passed through the valve plate from the center hole of the fixed plate. discharge.
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