Oil-sealed vane rotary vacuum pump

Abstract

An oil-sealed vane rotary vacuum pump includes at least one pump stage arranged in the housing and having a cylindrical chamber, a shaft excentrically arranged in the cylindrical chamber and provided with vanes, and a drive for driving the shaft and having a plurality of permanent magnets arranged on the shaft and stationary electrical coils surrounding the permanent magnets and producing a rotatable magnetic field, and control electronics for controlling the coils and arranged in a removable housing part of the pump.

1 . An oil-sealed vane rotary vacuum pump, comprising: 
 a housing;    at least one pump stage arranged in the housing and including a cylindrical chamber, a shaft excentrically arranged in the cylindrical chamber and provided with vanes, and drive means for driving the shaft and having a plurality of permanent magnets arranged on the shaft and stationary electrical coil means surrounding the permanent magnets and producing a rotatable magnetic field; and    control electronics for controlling the coil means and arranged in a removable housing part of the pump.    
   
   
       2 . An oil-sealed vane rotary vacuum pump according to  claim 1 , further comprising a split pot member arranged between the shaft and the coil means for separating the pumping chamber from atmosphere.  
   
   
       3 . An oil-sealed vane rotary vacuum pump according to  claim 1 , further comprising sensor means for determine a position of the pump shaft.  
   
   
       4 . An oil-sealed vane rotary vacuum pump according to  claim 3 , wherein the sensor means comprises Hall sensor means.  
   
   
       5 . An oil-sealed vane rotary vacuum pump according to  claim 1 , wherein the control electronics includes means for changing the rotational speed of the shaft.  
   
   
       6 . An oil-sealed vane rotary vacuum pump according to  claim 1 , wherein the control electronics is directly connectable with a supply network.  
   
   
       7 . An oil-sealed vane rotary vacuum pump according to  claim 6 , wherein the control electronics is connectable with one- or multi-phase voltage between 60V and 400V.  
   
   
       8 . An oil-sealed vane rotary vacuum pump according to  claim 1 , wherein the control electronics comprises power means for operating the coil means and wherein at least the power means forms a thermal contract with a wall of the pump housing.  
   
   
       9 . An oil-sealed vane rotary vacuum pump according to  claim 1 , wherein the coil means is encapsulated in one of cast plastic material and resin.  
   
   
       10 . An oil-sealed vane rotary vacuum pump according to  claim 1 , wherein the removable housing part, which contains the control electronics, is located in the pump housing.