一种带旁通功能的四通换向阀及其工作模式

一种带旁通功能的四通换向阀及及其工作模式，该四通换向阀包括主阀、引导阀以及连接二者的毛细管；主阀包括滑块，设置在滑块两端的左活塞和右活塞，左活塞与主阀壳体围成左腔体，右活塞与主阀壳体围成右腔体，左右腔体内分别设置左弹簧和右弹簧；引导阀包括滑碗，与滑碗连接的铁芯，与铁芯和引导阀壳体连接的弹簧，绕制在引导阀壳体外的电磁线圈；第一毛细管连接引导阀高压进气管口和主阀高压进气管口，第二毛细管连接引导阀低压出气管口和主阀低压出气管口，第三毛细管连接引导阀左换向管口和主阀的左腔体，第四毛细管连接引导阀右换向管口和主阀的右腔体；本发明还公开了该四通换向阀的工作模式；使得低充灌量热泵系统在冷启动及除霜过程中避免出现吸气压力过低。 The invention discloses a four-way reversing valve with a bypass function, and a working mode thereof. The four-way reversing valve comprises a main valve, a pilot valve and capillary tubes connecting the main valve with the pilot valve, wherein the main valve comprises a slide block, and a left piston and a right piston which are arranged at the two ends of the slide block, the left piston and the shell body of the main valve form a left cavity body in an encircling manner, the right piston and the shell body of the main valve form a right cavity body in an encircling manner, and a left spring and a right spring are arranged in the left cavity body and the right cavity body separately; the pilot valve co