Drive for vacuum pump

Abstract

A drive arrangement for a vacuum pump includes a separation member arranged between the motor stator and the motor rotor, and at least two, coaxial with each other and axially spaced from each other, guide surfaces, the separation member being formed as a separation sleeve which is supported and centered between the at least two guide surfaces, with the guide surfaces contacting an outer surface of the separation sleeve.

1 . A drive arrangement for a vacuum pump, comprising a motor stator; a motor rotor; a separation member arranged between the motor stator and the motor rotor; and at least two, coaxial with each other and axially spaced from each other, guide surfaces, the separation member having a separation sleeve which is supported and centered between the at least two guide surfaces, with the guide surfaces contacting an outer surface of the separation sleeve. 
   
   
       2 . A drive arrangement as set forth in  claim 1 , comprising at least two components which define, together with the separation member, a chamber in which the motor stator is located, and wherein the at least two guide surfaces are provided, respectively on the at least two components, and the at least two components are aligned relative to each other by respective surfaces provided on the at least two components and arranged coaxially with the guide surfaces. 
   
   
       3 . A drive arrangement as set forth in  claim 1 , wherein the separation sleeve is formed as a glass tube. 
   
   
       4 . A drive arrangement as set forth in  claim 3 , further comprising elastomeric ring means arranged on the outer side of the glass tube for sealing a space inside the glass tube from outside. 
   
   
       5 . A drive arrangement as set forth in  claim 2 , wherein the at least two components form stationary, axially spaced from each other, stops for the glass tube, with an axial distance between the stops being greater than a length of the glass tube. 
   
   
       6 . A drive arrangement as set forth in  claim 1 , wherein the motor stator comprises electrical coils, and the motor rotor comprises permanent magnets. 
   
   
       7 . A vacuum pump, comprising pumping component;, a shaft for supporting the pumping components; and a drive arrangement for driving the shaft; the drive arrangement including motor stator and rotor, a separation member arranged between the motor stator and the motor rotor and at least two, coaxial with each other and axially spaced from each other, guide surfaces, the separation member having a separation sleeve which is supported and centered between the at least two guide surfaces, with the guide surfaces contacting an outer surface of the separation sleeve. 
   
   
       8 . A vacuum pump as set forth in  claim 7 , further comprising oil-lubricated bearing means for supporting the shaft. 
   
   
       9 . A vacuum pump as set forth in  claim 7 , wherein the vacuum pump is formed as a vane rotary pump. 
   
   
       10 . A vacuum pump as set forth in  claim 7 , wherein the vacuum pump is formed as a Roots pumps.