公开(公告)号：US5056995A

公开(公告)日：1991-10-15

申请号：US483668

申请日：1990-02-23

申请人： Shigehiro Tamura ,  Hideaki Yoshidomi ,  Toshio Takeda

发明人： Shigehiro Tamura ,  Hideaki Yoshidomi ,  Toshio Takeda

IPC分类号： F04C18/18 ,  F04C18/16 ,  F04C29/12

CPC分类号： F04C29/12 ,  F04C18/16

摘要： A displacement compressor has a housing defining a chamber and having an inlet and an outlet for the chamber. A pair of meshing helical rotors are rotatably supported about parallel axes in the chamber, so that a compressible fluid may be pumped from the inlet to the outlet. A recess in the wall of the housing is positioned in the chamber and around the outlet and has a substantially trapezoidal shape, in plan. The non-parallel edges of the substantially trapezoidal shape are angled with respect to the axial direction of the rotors, preferably by an angle which is substantially equal to the twist angle of the rotors. Noise producing pressure pulsations at the outlet are thereby reduced.

摘要翻译： 排量压缩机具有限定腔室的壳体，并具有腔室的入口和出口。 一对啮合的螺旋转子围绕腔室中的平行轴线可旋转地支撑，使得可压缩流体可以从入口泵送到出口。 在壳体的壁中的凹部定位在腔室中并且围绕出口并且具有基本上梯形的形状。 大致梯形形状的非平行边缘相对于转子的轴向倾斜，优选地大致等于转子的扭转角度的角度。 从而降低出口处产生噪音的压力脉动。