Dry-running reciprocating vacuum pump

Abstract

A dry-running reciprocating vacuum pump includes at least one pump stage located in the housing and including a cylinder having at least one gas inlet, a gas outlet, and a piston reciprocating in the cylinder and controlling the at least one inlet, a drive system for driving the piston-driving shaft, which is connected by a crank gear mechanism with the piston, and including a plurality of permanent magnets arranged on the shaft and stationary electrical coils surrounding the permanent magnets for producing a rotatable magnetic field, and a control electronics located in the pump housing for operating the coils.

1 . A dry-running reciprocating vacuum pump, comprising: 
 a housing;    at least one pump stage located in the housing and including a cylinder having at least one gas inlet, a gas outlet, and a piston reciprocating in the cylinder, the at least one inlet being controlled by the piston; a shaft located in the housing for driving the piston;    a crank gear mechanism connecting the shaft with the piston,    a drive system for driving the shaft and having a plurality of permanent magnets arranged on the shaft, and stationary electrical coil means surrounding the permanent magnets for producing a rotatable magnetic field; and    a control electronics located in the housing for operating the coil means.    
   
   
       2 . A dry-running reciprocating vacuum pump according to  claim 1 , further comprising sensor means for determining a position of the shaft.  
   
   
       3 . A dry-running reciprocating vacuum pump according to  claim 2 , wherein the sensor means comprises Hall sensor means.  
   
   
       4 . A dry-running reciprocating vacuum pump according to  claim 1 , wherein the control electronics is directly connectable with a supply network.  
   
   
       5 . A dry-running reciprocating vacuum pump according to  claim 4 , wherein the control electronics is connectable with one- or multi-phase voltage between 60V and 400V.  
   
   
       6 . A dry-running reciprocating vacuum pump according to  claim 1 , wherein the control electronics comprises means for recognizing an applied network voltage and means for switching voltage regions.  
   
   
       7 . A dry-running reciprocating vacuum pump according to  claim 1 , wherein the control electronics comprises a power element for operating the coil means and forming a thermal contact with a wall of the pump housing.