Rotary Pump

Abstract

A rotary pump for delivering a fluid includes a pump housing having a first and a second fluid connections, wherein the first and the second fluid connections each open into a displacement chamber of the pump housing, a displacement rotor arranged in the displacement chamber, rotatable about an axis of rotation (D) in a first direction of rotation and a second direction of rotation opposite to the first direction of rotation, a plurality of displacement elements for delivering the fluid, distributed over the circumference of the displacement rotor, radially movable with respect to the axis of rotation (D), and designed to deliver the fluid from the first to the second fluid connection when the displacement rotor is rotated in the first direction of rotation, and to deliver the fluid from the second fluid connection to the first fluid connection when the displacement rotor is rotated in the second direction of rotation.

1 . A rotary pump for delivering a fluid, the rotary pump comprising:
 a pump housing having a first fluid connection and a second fluid connection, wherein the first fluid connection and the second fluid connection each open into a displacement chamber of the pump housing;   a displacement rotor arranged in the displacement chamber, wherein the displacement rotor is rotatable about an axis of rotation (D) in a first direction of rotation and a second direction of rotation opposite to the first direction of rotation;   a plurality of displacement elements for delivering the fluid, wherein the plurality of displacement elements is distributed over the circumference of the displacement rotor and is radially movable with respect to the axis of rotation (D), wherein   the displacement elements are configured
 to deliver the fluid to be delivered from the first fluid connection to the second fluid connection when the displacement rotor is rotated in the first direction of rotation, and 
 to deliver the fluid to be delivered from the second fluid connection to the first fluid connection when the displacement rotor is rotated in the second direction of rotation. 
   
     
     
         2 . The rotary pump according to  claim 1 , wherein the first fluid connection opens into a first chamber section of the displacement chamber and the second fluid connection opens into a second chamber section of the displacement chamber, wherein
 the first chamber section forms a suction zone and the second chamber section forms a pressure zone when the displacement rotor rotates in the first direction of rotation, and   the first chamber section forms a pressure zone and the second chamber section forms a suction zone when the displacement rotor rotates in the second direction of rotation.   
     
     
         3 . The rotary pump according to  claim 2 , wherein each two of the plurality of displacement elements arranged adjacent to one another in the circumferential direction of the displacement rotor, together with an outer circumferential surface of the displacement rotor and an inner circumferential surface of the displacement chamber delimit a displacement cell, wherein the volume of the respective displacement cell increases in the suction zone and decreases in the pressure zone when the displacement rotor rotates about the axis of rotation (D). 
     
     
         4 . The rotary pump according to  claim 1 , wherein the radial movement of the displacement elements radially inward is delimited by a pressure chamber, wherein a fluid pressure introduced into the pressure chamber presses the displacement elements radially outward. 
     
     
         5 . The rotary pump according to  claim 2 , wherein the radial movement of the displacement elements radially inward is delimited by a pressure chamber, wherein a fluid pressure introduced into the pressure chamber presses the displacement elements radially outward, and
 wherein the pressure chamber is connected in a fluid-communicating manner either to the first chamber section or to the second chamber section depending on the direction of rotation of the displacement rotor.   
     
     
         6 . The rotary pump according to  claim 2 , wherein the radial movement of the displacement elements radially inward is delimited by a pressure chamber, wherein a fluid pressure introduced into the pressure chamber presses the displacement elements radially outward,
 wherein the pressure chamber is connected in a fluid-communicating manner to the second chamber section when the displacement rotor rotates in the first direction of rotation, and   wherein the pressure chamber is connected in a fluid-communicating manner to the first chamber section when the displacement rotor rotates in the second direction of rotation.   
     
     
         7 . The rotary pump according to  claim 4   wherein the pressure chamber can is configured to be connected in a fluid-communicating manner via a valve to the fluid connections.   
     
     
         8 . The rotary pump according to  claim 7 , wherein the valve is a double-acting check valve. 
     
     
         9 . The rotary pump according to  claim 7 , wherein the valve is a ball valve. 
     
     
         10 . The rotary pump according to claim  16 , wherein the valve:
 connects the pressure chamber in a fluid-communicating manner to at least one of the second fluid connection or the second chamber section, and   fluidically separates the pressure chamber from at least one of the first fluid connection or from the first chamber section,   
       when the displacement rotor rotates in the first direction of rotation. 
     
     
         11 . The rotary pump according to  claim 7 , wherein the valve
 connects the pressure chamber in a fluid-communicating manner to at least one of the first fluid connection or the first chamber section, and   fluidically separates the pressure chamber from at least one of the second fluid connection or from the second chamber section,   
       when the displacement rotor rotates in the second direction of rotation. 
     
     
         12 . The rotary pump according to  claim 1 , wherein
 the first fluid connection forms a low-pressure inlet and the second fluid connection forms a high-pressure outlet when the displacement rotor rotates in the first direction of rotation, and   the first fluid connection forms a high-pressure outlet and the second fluid connection forms a low-pressure inlet when the displacement rotor rotates in the second direction of rotation.   
     
     
         13 . The rotary pump according to claim l one of the preceding claims , wherein the rotary pump is a rotary cell pump for delivering a hydraulic liquid. 
     
     
         14 . A fluid system for the chassis of a vehicle, wherein the fluid system has a rotary pump according to  claim 1 . 
     
     
         15 . The fluid system according to  claim 14 , wherein the fluid system has an actuator or a chassis actuator, and the actuator or the chassis actuator is connected in a fluid-communicating manner to one of the fluid connections such that the actuator or the chassis actuator is fluidically pressurized and depressurized by the rotary pump. 
     
     
         16 . The rotary pump according to  claim 4 , wherein the first fluid connection opens into a first chamber section of the displacement chamber and the second fluid connection opens into a second chamber section of the displacement chamber, wherein
 the first chamber section forms a suction zone and the second chamber section forms a pressure zone when the displacement rotor rotates in the first direction of rotation, and   the first chamber section forms a pressure zone and the second chamber section forms a suction zone when the displacement rotor rotates in the second direction of rotation,   wherein the pressure chamber is configured to be connected in a fluid-communicating manner via a valve to at least one of the fluid connections or the chamber sections.