Vacuum pump with a fan

Abstract

A vacuum pump for producing low or high vacuum includes a housing ( 1′ ) having an inlet ( 9 ) and an outlet ( 9 ), a pumping system ( 30 ) for compressing gas, a motor ( 25, 26 ) for driving the pumping system ( 30 ), and a fan ( 6 ) for cooling the pump and having its own motor ( 6 a ) for driving the fan ( 6 ).

1 . A vacuum pump for producing low or high vacuum, comprising a housing ( 1 ′) having an inlet ( 9 ) and an outlet ( 9 ); a pumping system ( 30 ) for compressing gas; a motor ( 25 ,  26 ) for driving the pumping system ( 30 ); a fan ( 6 ) for cooling the pump; and a motor ( 6   a ) for driving the fan ( 6 ). 
   
   
       2 . A vacuum pump according to  claim 1 , wherein the housing ( 1 ′) has cooling ribs ( 8 ), and the fan ( 6 ) is arranged for feeding cooling air in space between the cooling ribs ( 8 ). 
   
   
       3 . A vacuum pump according to  claim 2 , further comprising a hood ( 1 ) that at least partially surrounds the housing ( 1 ′), wherein the hood ( 1 ) is so formed in a region of the cooling ribs ( 8 ) that the cooling air from the fan ( 6 ) is deflected in the space between the cooling ribs ( 8 ). 
   
   
       4 . A vacuum pump according to  claim 1 , wherein the housing ( 1 ′) has at least one section ( 3 ) in which the fan ( 6 ) is located. 
   
   
       5 . A vacuum pump according to  claim 1 , wherein the housing has at least one pumping section ( 5 ) in which the pumping system ( 30 ) is located, and a control section ( 2 ) in which control electronics ( 12 ) is located. 
   
   
       6 . A vacuum pump according to  claim 5 , wherein the fan ( 6 ) is so arranged that the cooling air from the fan ( 6 ) flows to the at least one pumping section ( 5 ). 
   
   
       7 . A vacuum pump according to  claim 5 , wherein the fan ( 6 ) is so arranged that the control section ( 2 ), together with the control electronics is cooled as a result of free convection. 
   
   
       8 . A vacuum pump according to  claim 1 , wherein the pumping system ( 30 ) has a shaft ( 24 ) eccentrically arranged in a housing of the pumping housing section ( 5 ), extending through a bore formed in the pumping housing section ( 5 ), and a vane ( 33 ) supported on the shaft ( 24 ) for producing a pumping action, and wherein the pumping system ( 5 ) contains oil for sealing and lubricating the vane ( 33 ). 
   
   
       9 . A method of operating a vacuum pump for producing low or high vacuum and including a housing ( 1 ′) having an inlet ( 9 ) and an outlet ( 9 ), a pumping system ( 30 ) for compressing gas, a motor ( 25 ,  26 ) for driving the pumping system ( 30 ), a fan ( 6 ) for cooling the pump, and a motor for driving the fan, the method comprising the step of operating the pump motor ( 25 ,  26 ) with a first rotational speed and operating the fan motor ( 6   a ) with a second rotational speed, wherein the first and second rotational speeds are different at least temporarily.