公开(公告)号：WO2004106742A1

公开(公告)日：2004-12-09

申请号：PCT/US2003/016858

申请日：2003-05-29

Applicant: FRISTAM PUMPS, INC. ,  EHLKE, Duane

Inventor： EHLKE, Duane

IPC: F04B49/035

CPC classification number: F04C14/26 ,  F04C2/126

Abstract: A rotary piston pump (100) includes a pump housing (102) having an interior housing wall (104) at least partially surrounding a pump interior (106), with the interior housing wall opening at a pump inlet (108) at the low-pressure side of the pump and a pump outlet (110) at the high-pressure side of the pump. Rotors (112) bearing radially protruding pistons (114) are situated with the pump interior, and the pistons intermesh between the pump inlet and the pump outlet. A movable relief member (122) such as a piston is situated on a portion of the interior housing wall, and may move toward or away from the pump interior to alter the effective volume of the pump interior and alter the pressure therein. The relief member is preferably resiliently and elastically biased toward the pump interior, as by a spring (140), whereby the relief member will yield and move away from the pump interior when excess pressure conditions exist therein. The relief member is preferably situated between the pump inlet and the pump outlet adjacent the region where the pistons intermesh so that retraction of the relief member will effectively define a passage between the low-pressure side of the pump and the high-pressure side of the pump, thereby allowing at least partial equalization of the pressure therebetween when the pressure difference between the sides reaches an excessive level.

Abstract translation: 旋转活塞泵（100）包括具有至少部分地围绕泵内部（106）的内部壳体壁（104）的泵壳体（102），其中内部壳体壁在低压侧的泵入口（108）处开口， 泵的高压侧和在泵的高压侧的泵出口（110）。 具有径向突出的活塞（114）的转子（112）与泵内部一起定位，并且活塞在泵入口和泵出口之间相互啮合。 诸如活塞的可移动卸载构件（122）位于内壳体壁的一部分上，并且可以朝向或远离泵内部移动，以改变泵内部的有效容积并改变其中的压力。 溢流构件优选地通过弹簧（140）弹性地弹性偏置到泵内部，由此当其中存在过量的压力条件时，释放构件将产生并远离泵内部移动。 溢流构件优选地位于泵入口和泵出口之间，邻近活塞相互啮合的区域，使得卸载构件的缩回将有效地限定泵的低压侧和泵的低压侧之间的通道 泵，从而当侧面之间的压力差达到过高水平时允许其间的压力至少部分均衡。