Pump for delivering a liquid

Abstract

A pump for delivering a liquid has a pump housing with at least one inlet and at least one outlet. On the pump housing, there is arranged an eccentric which, with an axis, is rotatable relative to the pump housing. A deformable element between the pump housing and the eccentric delimits at least one delivery path from the inlet to the outlet and forms at least one displaceable seal of the delivery path, which displaceable seal partitions off at least one closed pump volume in the delivery path. By a movement of the eccentric, the displaceable seal is displaceable to deliver the liquid along the delivery path. The inlet and the outlet have an angular spacing to one another in a circumferential direction about the axis, and the seal spans an angle segment in which the delivery path is closed, the angle segment being larger than the angular spacing.

1 - 12 . (canceled) 
     
     
         13 . A pump ( 1 ) that delivers a liquid, the pump ( 1 ) comprising:
 a pump housing ( 2 ) having at least one inlet ( 3 ) and at least one outlet ( 4 );   a rotatable eccentric ( 5 ) arranged on the pump housing ( 2 ), the eccentric ( 5 ) being rotatable about an axis ( 6 ) relative to the pump housing ( 2 ); and   a deformable element ( 7 ) arranged between the pump housing ( 2 ) and the eccentric ( 5 ), the deformable element ( 7 ) delimiting at least one delivery path ( 8 ) from the at least one inlet ( 3 ) to the at least one outlet ( 4 ) and forming at least one displaceable seal ( 9 ) of the delivery path ( 8 ), said at least one displaceable seal separating off at least one closed pump volume ( 10 ) in the delivery path ( 8 ),   wherein, by a movement of the eccentric ( 5 ), the at least one displaceable seal ( 9 ) is displaceable in a delivery direction ( 11 ) from the inlet ( 3 ) to the outlet ( 4 ) to deliver the liquid along the delivery path ( 8 ), and   wherein the inlet ( 3 ) and the outlet ( 4 ) have an angular spacing ( 13 ) with respect to one another in a circumferential direction ( 12 ) about the axis ( 6 ), and the at least one displaceable seal ( 9 ) spans, in the circumferential direction ( 12 ), an angular segment ( 14 ) in which the delivery path ( 8 ) is closed, the angular segment ( 14 ) being larger than the angular spacing ( 13 ).   
     
     
         14 . The pump ( 1 ) as claimed in  claim 13 , wherein the deformable element ( 7 ) is a hose ( 20 ) arranged in an arcuate gap ( 17 ) between the eccentric ( 5 ) and the pump housing ( 2 ) and connecting the inlet ( 3 ) to the outlet ( 4 ). 
     
     
         15 . The pump ( 1 ) as claimed in  claim 13 , wherein the deformable element ( 7 ) is a deformable diaphragm ( 21 ), and the delivery path ( 8 ) from the at least one inlet ( 3 ) to the at least one outlet ( 4 ) is at least partially delimited by the pump housing ( 2 ) and by the deformable diaphragm ( 21 ). 
     
     
         16 . The pump ( 1 ) as claimed in  claim 13 , wherein the angular spacing ( 13 ) between the inlet ( 3 ) and the outlet ( 4 ) is less than 40°. 
     
     
         17 . The pump ( 1 ) as claimed in  claim 13 , wherein the at least one inlet ( 3 ) and the at least one outlet ( 4 ) have a cross-sectional area ( 16 ) elongated in a direction of the axis ( 6 ). 
     
     
         18 . The pump ( 1 ) as claimed in  claim 13 , wherein the angular segment ( 14 ) spanned by the seal ( 9 ) is greater than 90°. 
     
     
         19 . The pump ( 1 ) as claimed in  claim 13 , wherein the eccentric ( 5 ) has a shape deviating from a circular shape, such that a displacement of the at least one seal ( 9 ) in the delivery direction ( 11 ) from the inlet ( 3 ) to the outlet ( 4 ) gives rise to at least one of the following effects:
 a closed pump volume ( 10 ) in the delivery path ( 8 ) is compressed, and   the deformable element ( 7 ) is deformed such that a pressure increase occurs in the closed pump volume ( 10 ).   
     
     
         20 . The pump ( 1 ) as claimed in  claim 13 , wherein the pump housing ( 2 ) has a shape deviating from a circular shape, such that a displacement of the at least one seal ( 9 ) in the delivery direction ( 11 ) from the inlet ( 3 ) to the outlet ( 4 ) gives rise to at least one of the following effects:
 a closed pump volume ( 10 ) in the delivery path ( 8 ) is compressed, and   the deformable element ( 7 ) is deformed such that a pressure increase occurs in the closed pump volume ( 10 ).   
     
     
         21 . The pump ( 1 ) as claimed in  claim 19 , wherein at least the pump housing ( 2 ) or the eccentric ( 5 ) is designed such that an arcuate gap ( 17 ) between the pump housing ( 2 ) and the eccentric ( 5 ), in which arcuate gap the deformable element ( 7 ) is arranged, tapers continuously in the delivery direction ( 11 ) from the inlet ( 3 ) to the outlet ( 4 ). 
     
     
         22 . The pump ( 1 ) as claimed in  claim 21 , wherein the pump housing has a first radius ( 18 ) at the inlet ( 3 ) and has a second radius ( 19 ) at the outlet ( 4 ), wherein the first radius ( 18 ) is greater than the second radius ( 19 ), and the first radius ( 18 ) transitions continuously into the second radius ( 19 ). 
     
     
         23 . The pump ( 1 ) as claimed in  claim 13 , wherein at least one of the following components is configured such that, during the displacement of the at least one seal ( 9 ) from the inlet ( 3 ) to the outlet ( 4 ), a continuous adaptation of the pressure from the inlet ( 3 ) to the outlet ( 4 ) takes place within the pump ( 1 ) as a result of the compression of the at least one closed pump volume ( 10 ) or as a result of the pressure increase that occurs as a result of the deformation of the deformable element ( 7 ):
 the inlet ( 3 ),   the outlet ( 4 ),   the seal ( 9 ),   the pump housing ( 2 ), and   the eccentric ( 5 ).   
     
     
         24 . A motor vehicle ( 22 ) comprising:
 an internal combustion engine ( 23 );   an exhaust-gas treatment device ( 24 ) configured to purify exhaust gases of the internal combustion engine ( 23 ); and   a device ( 25 ) having the pump ( 1 ) as claimed in  claim 13 , by which a liquid for exhaust-gas purification is deliverable into the exhaust-gas treatment device ( 24 ).   
     
     
         25 . The pump ( 1 ) as claimed in  claim 20 , wherein at least the pump housing ( 2 ) or the eccentric ( 5 ) is designed such that an arcuate gap ( 17 ) between the pump housing ( 2 ) and the eccentric ( 5 ), in which arcuate gap the deformable element ( 7 ) is arranged, tapers continuously in the delivery direction ( 11 ) from the inlet ( 3 ) to the outlet ( 4 ). 
     
     
         26 . The pump ( 1 ) as claimed in  claim 25 , wherein the pump housing has a first radius ( 18 ) at the inlet ( 3 ) and has a second radius ( 19 ) at the outlet ( 4 ), wherein the first radius ( 18 ) is greater than the second radius ( 19 ), and the first radius ( 18 ) transitions continuously into the second radius ( 19 ).