Pump

Abstract

A pump has a housing in which a rotor is arranged, which is rotatable in the housing about a housing-fixed axis of rotation, the rotor having at least one recess in which is received at least one displacement body which, when the rotor rotates, revolves about the axis of rotation and at the same time runs along on a housing inner wall of the housing, the displacement body being radially movable in the recess between a position retracted into the recess and a position extended out of the recess. A first chamber is present between the outside of the rotor and the housing inner wall. The displacement body, when it revolves about the axis of rotation, subdivides the first chamber into a leading first subchamber and a trailing second subchamber. The first subchamber is connected by means of a first duct and the second subchamber by means of a second duct in the rotor to a further chamber which is formed between the displacement body and an inner wall of the recess and which, according to the radial movements of the displacement body which occur when the rotor revolves about the axis of rotation, is alternately increased in volume, with the result that an additional vacuum arises in the further chamber and in the second subchamber, or decreased in volume, with the result that an additional overpressure arises in the further chamber and in the first subchamber.

1 . A pump, comprising
 a housing having a housing inner wall,   a rotor arranged in the housing, the rotor having at least one recess, the rotor being rotatable in the housing about a housing-fixed axis of rotation,   at least one displacement body received in the at least one recess of the rotor, the displacement body, when the rotor rotates about the housing-fixed axis of rotation, revolves about the axis of rotation and at the same time runs along on the housing inner wall of the housing, the displacement body being radially movable in the recess between a position retracted into the recess and a position extended out of the recess,   a first chamber arranged between the housing inner wall and an outside of the rotor,   a leading first subchamber and a trailing second subchamber, into which the displacement body, when revolving about the axis of rotation, subdivides the first chamber,   a further chamber formed between the displacement body and an inner wall of the recess,   a first duct connecting the leading first subchamber with the further chamber,   a second duct connecting the trailing second subchamber with the further chamber,   the further chamber, according to the radial movements of the displacement body which occur when the rotor revolves about the axis of rotation, is alternately increased in volume, with the result that an additional vacuum arises in the further chamber and in the second subchamber, and decreased in volume, with the result that an additional overpressure arises in the further chamber and in the first subchamber.   
     
     
         2 . The pump of  claim 1 , wherein the displacement body has, on its side facing the inner wall of the recess, a surface contour which corresponds to the inner contour of the inner wall of the recess. 
     
     
         3 . The pump of  claim 1 , wherein the housing inner wall, along which the displacement body runs, has a surface contour which corresponds to a surface contour of a side of the displacement body which faces the housing inner wall. 
     
     
         4 . The pump of  claim 1 , wherein the displacement body is designed as a body of revolution which can rotate in the recess at least about an axis parallel to the axis of rotation. 
     
     
         5 . The pump of  claim 4 , wherein the displacement body is a ball. 
     
     
         6 . The pump of  claim 5 , wherein the ball is a hollow ball. 
     
     
         7 . The pump of  claim 5 , wherein the inner wall of the recess is in the form of a part-spherical surface area. 
     
     
         8 . The pump of  claim 4 , wherein the displacement body is a cylinder, a cylinder axis of which runs parallel to the axis of rotation. 
     
     
         9 . The pump of  claim 8 , wherein the cylinder is a hollow cylinder. 
     
     
         10 . The pump of  claim 8 , wherein the inner wall of the recess is in the form of a part-cylindrical surface area. 
     
     
         11 . The pump of  claim 1 , wherein a first valve is arranged in the first duct, which first valve closes the first duct when the displacement body moves out of the retracted position to the extended position and which releases the first duct when the displacement body moves out of the extended position into the retracted position. 
     
     
         12 . The pump of  claim 1 , wherein a second valve is arranged in the second duct, which second valve releases the second duct when the displacement body moves out of the retracted position to the extended position and closes the second duct when the displacement body moves of the extended position into the retracted position. 
     
     
         13 . The pump of  claim 11 , wherein the first valve is controlled automatically by instantaneous pressures prevailing in the first duct on both sides of the first valve. 
     
     
         14 . The pump of  claim 12 , wherein the second valve is controlled automatically by instantaneous pressures prevailing in the second duct on both sides of the second valve. 
     
     
         15 . The pump of  claim 11 , wherein the first valve has a first valve disc and a first valve seat, the first valve disc closing against the first valve seat in direction towards the first subchamber. 
     
     
         15 . The pump of  claim 15 , wherein the first valve disc is prestressed into a closing position of the first valve. 
     
     
         17 . The pump of  claim 14 , wherein the first valve is arranged in the first duct such that the first valve disc and the first valve seat are oriented essentially in circumferential direction about the axis of rotation. 
     
     
         18 . The pump of  claim 12 , wherein the second valve has a second valve disc and a second valve seat, the second valve disc closing against the second valve seat in direction towards the second subchamber. 
     
     
         19 . The pump of  claim 18 , wherein the second valve disc is prestressed into a closing position of the second valve. 
     
     
         20 . The pump of  claim 18 , wherein the second valve is arranged in the second duct such that the second valve disc and the second valve seat are oriented essentially in circumferential direction about the axis of rotation. 
     
     
         21 . The pump of  claim 1 , wherein a plurality of first ducts and a plurality of second ducts are present in the rotor.