Vane with axial seal

Abstract

A vane for a vane cell pump, in particular a vacuum pump, including: a vane body, wherein the vane body has an opening on at least one end-facing side facing a cover or base of a pump space of the vane cell pump; and an insert which is arranged in the opening and guided such that it can be axially moved in the opening.

1 . A vane for a vane cell pump, in particular a vacuum pump, comprising:
 a vane body, wherein the vane body comprises an opening on at least one end-facing side facing a cover or a base of a pump space of the vane cell pump; and   an insert which is arranged in the opening and guided such that it can be axially moved in the opening.   
     
     
         2 . The vane according to  claim 1 , wherein the vane body surrounds the opening and therefore also the insert. 
     
     
         3 . The vane according to  claim 1 , wherein the insert is guided, such that it can slide axially, on inner circumferential surfaces of the vane body which form the opening. 
     
     
         4 . The vane according to  claim 1 , wherein a tensing device is arranged in the vane body and biases the insert towards the base or the cover. 
     
     
         5 . The vane according to  claim 1 , wherein the vane body and/or the insert are formed from or comprise plastic. 
     
     
         6 . The vane according to  claim 1 , wherein the vane body comprises an opening on each of the end-facing sides facing the base and the cover, and an insert is arranged in each of the openings, wherein the vane body between the two openings is preferably formed as a hollow body. 
     
     
         7 . The vane according to  claim 6 , wherein the tensing device biases one of the inserts in an axial direction onto the base and biases the other of the inserts in an axial direction onto the cover of the pump space, and one of the openings axially faces the cover and the other of the openings axially faces the base of the pump space. 
     
     
         8 . The vane according to  claim 6 , wherein the vane body surrounds the openings and therefore also the respective insert. 
     
     
         9 . The vane according to  claim 6 , wherein each insert comprises a separate tensing device, or a common tensing device acts on both inserts. 
     
     
         10 . The vane according to  claim 9 , wherein the tensing device is connected to both inserts, and the inserts can be inserted into the vane body together with the tensing device. 
     
     
         11 . The vane according to  claim 1 , wherein the tensing device comprises at least one spring element or is formed by applying pressure to the insert using a pressure fluid. 
     
     
         12 . The vane according to  claim 11 , wherein the spring element consists of at least one pressure spring. 
     
     
         13 . The vane according to  claim 1 , wherein a wall thickness of the vane body, at least in the region of the openings, is equal to or greater than 1.5 mm. 
     
     
         14 . The vane according to  claim 1 , wherein the insert is formed from a hollow profile and comprises reinforcing fins. 
     
     
         15 . The vane according to  claim 1 , wherein at least the region of the insert in which it abuts the cover and/or the base of the pump chamber exhibits a surface design and/or coating which reduces a frictional value between the insert and the cover and/or base. 
     
     
         16 . A vane cell pump, comprising:
 a pump body made of a first material having a first coefficient of expansion; and   at least one vane made of a second material having a second coefficient of expansion which is different to the first coefficient of expansion; wherein   the vane comprises a vane body comprising at least one opening on an end-facing side facing a base or a cover of a pump space of the pump, and   an insert or inserts is/are arranged in the openings or openings and biased towards the base or cover by means of at least one tensing device.   
     
     
         17 . The vane cell pump according to  claim 16 , wherein at the operating temperature, the coefficient of expansion of the vane which is for example made of plastic is greater than the coefficient of expansion of the pump body which is for example made of aluminium. 
     
     
         18 . The vane cell pump according to  claim 16 , wherein the vane insert is arranged in the opening and guided such that it can be axially moved in the opening. 
     
     
         19 . A method for increasing an evacuating output of a vane cell pump comprising a pump body made of a first material having a first coefficient of expansion and at least one vane made of a second material having a second coefficient of expansion which is different to the first coefficient of expansion, at least at low temperatures, wherein
 the vane comprises an opening on at least one end-facing side facing a cover or base of an interior pump space of the pump body, and   an insert is inserted into the opening, the insert is pressed against the cover and/or the base by a tensing device arranged in the interior of the vane, such that the insert or inserts is/are pressed onto the cover and/or the base in a seal at all temperatures, despite the different coefficients of expansion of the pump body and the vane.   
     
     
         20 . The method according to  claim 19 , wherein
 the insert or inserts of the vane cell pump is/are arranged in the openings or openings and biased towards the base or cover by at least one tensing device; and/or   the vane comprises a vane body, wherein the vane body comprises an opening on at least one end-facing side facing a cover or a base of a pump space of the vane cell pump; and an insert which is arranged in the opening and guided such that it can be axially moved in the opening.