Rotary -vane vaccum pump is with preventing returning oily air inlet and rotary -vane vaccum pump

一种旋片式真空泵用防返油进气口及旋片式真空泵

Abstract

The utility model discloses a rotary -vane vaccum pump is with preventing returning oily air inlet and rotary -vane vaccum pump, the front end of the air inlet returns the oil seal interface for the interface that admits air, rear end for preventing, and interface and prevent returning and set up the ring flange between the oil seal interface admits air, admit air the interface the opening and prevent returning between the oil seal interface through leading to the inlet channel intercommunication to one side, admit air the projection of interface on ring flange place plane with the opening of preventing returning the oil seal interface in the only some projections coincidence of staggering each other of the projection on the ring flange place plane. The air inlet is through admitting air interface and prevent returning between the oil seal interface intercommunication through the oblique logical inlet channel of non - bypass structure, and it is effectual not only to prevent returning oil, greatly reduced the oil blanket sliding vane rotary pump return oily probability, and simple structure increases and manufactures the degree of difficulty.
本实用新型公开了一种旋片式真空泵用防返油进气口及旋片式真空泵,该进气口的前端为进气接口,后端为防返油密封接口,进气接口与防返油密封接口之间设置法兰盘;进气接口的开口与防返油密封接口之间通过斜通进气通道连通,进气接口在法兰盘所在平面上的投影与防返油密封接口的开口在法兰盘所在平面上的投影相互错开仅部分投影重合。该进气口通过在进气接口与防返油密封接口之间经非直通结构的斜通进气通道连通,不仅防返油效果好,大大降低了油封旋片泵的返油概率,且结构简单,未增加制造难度。

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