公开(公告)号：US3810488A

公开(公告)日：1974-05-14

申请号：US30802972

申请日：1972-11-20

Applicant: CONTROLS CO OF AMERICA

Inventor： ORTH C ,  TREDER C ,  GRIFFOUL M

IPC: F16K17/10 ,  F25B41/04 ,  G05D16/10

CPC classification number: G05D16/106 ,  F16K17/105 ,  F25B41/043 ,  Y10T137/7766 ,  Y10T137/7767

Abstract: The interior of the bellows is sealed at atmospheric pressure so the pressure on the outside of the bellows is resisted by the atmospheric pressure within the bellows as well as by the spring. When the pressure on the outside of the bellows (which is evaporator pressure in a refrigeration system) exceeds a predetermined amount, the bellows tends to collapse and the head of the bellows pulls away from the actuating pin and allows the spring acting on the pilot valve to open the pilot valve whereupon the pressure to the right of the head of the piston is reduced, allowing the piston to move to the right against the return spring force and thus open the outlet by moving the end of the piston wall past the slot in the stationary sleeve. When the pressure falls below the desired amount, the bellows expands and moves the head of the bellows against the actuating pin to close the pilot valve. Flow through the bleed hole in the end of the piston to the pilot valve chamber rapidly raises the pressure therein so that the return spring can move the piston to close the outlet. Even with the outlet closed, the small port in the piston sleeve allows enough refrigerant flow to insure adequate flow to the compressor to keep the compressor lubricated. The bleed hole in the piston head is sized to require substantial opening of the pilot valve which, therefore, minimizes false opening of the main valve. Controlled leakage to the groove at the pilot end of the piston blocks flow from the pilot valve chamber to the main outlet and stabilizes valve operation.

Abstract translation: 波纹管的内部在大气压力下被密封，因此波纹管外部的压力受波纹管内的大气压力以及弹簧的抵抗。 当波纹管外部的压力（其是制冷系统中的蒸发器压力）超过预定量时，波纹管倾向于塌缩并且波纹管的头部从致动销拉开并允许弹簧作用在先导阀 以打开先导阀，因此活塞头部右侧的压力减小，允许活塞抵抗复位弹簧力向右移动，从而通过将活塞壁的端部移动通过狭槽而打开出口 固定套筒。 当压力低于所需量时，波纹管膨胀并将波纹管的头部靠在致动销上以关闭先导阀。 流过活塞末端的排放孔到先导阀室，迅速升高其中的压力，使得复位弹簧可以移动活塞以关闭出口。 即使出口关闭，活塞套筒中的小口允许足够的制冷剂流量来确保足够的流量到压缩机以保持压缩机润滑。 活塞头中的排放孔的尺寸设置成要求导阀的大量打开，因此导致主阀的假开口最小化。 在活塞块的先导端处对槽的受控泄漏从先导阀室流到主出口并稳定阀的操作。