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在制冷系统回路中,采用一个单向阀,隔离了蒸发器和压缩机。将一常开的电磁阀装在卸荷管上,卸荷管的一端通向驱动缸的后腔,而前腔即活塞的另一侧和排气口相通。卸荷管的另一端在单向阀前端与系统的低压侧相连,驱动缸的后腔还通过装有一常闭电磁阀的加荷管与系统的高压侧相通。当压缩机停机时,系统的低压力作用在后腔,而前腔却作用着系统的高压力,从而驱动滑阀向压缩机空负荷位置移动,则不需要通常所用的弹簧就可以使滑阀达到压缩机空负荷位置。
In the refrigeration system loop, a check valve is used to isolate the evaporator and compressor. A normally open solenoid valve is mounted on the unloading tube, one end of the unloading tube leading to the rear chamber of the cylinder, and the front chamber communicating with the exhaust port on the other side. The other end of the unloading tube is connected to the low pressure side of the system at the front end of the check valve. The rear chamber of the cylinder also communicates with the high pressure side of the system through a loading tube equipped with a normally closed solenoid valve. When the compressor is shut down, the low pressure in the system acts on the back chamber and the front chamber acts on the high pressure in the system, driving the spool to move to the compressor empty load position. This eliminates the need for the normally used springs to slide the spool Compressor empty load position.