Pump

1. A pump including:

an outer housing having an outlet chamber with an outlet connector;

a first part pump and a second, downstream part pump, wherein the first and second part pumps are arranged in the outer housing;

a separating element which can be arranged between the first and second part pumps; and

a rotor shaft which is rotatably arranged in the first and second part pumps,

wherein the outer housing, the first part pump and the separating element bound a first pressure chamber and the outer housing, the second part pump and the separating element bound a second pressure chamber and the first and second pressure chambers are designed and arranged such that the outlet chamber is formed as a single high-pressure region of the pump, and the first pressure chamber includes a compensation opening and the second pressure chamber includes an inlet opening, wherein an output of a pump module is in flow communication with the compensation opening of the first pressure chamber by means of a compensation line.

2. The pump according to claim 1 , wherein the first pressure chamber and the outlet chamber and the second pressure chamber and the outlet chamber are separated from one another by the separating element.

3. The pump according to claim 1 , wherein the separating element is made in two parts and a part of the stator of a pump module is formed as a part of the separating element.

4. The pump according to claim 1 , wherein a first sealing element is arranged between the first pressure chamber and the outlet chamber and a second sealing element is arranged between the second pressure chamber and the outlet chamber.

5. The pump according to claim 4 , wherein the first and second sealing elements are arranged between the separating element and the outer housing.

6. The pump according to claim 4 , wherein the first sealing element is arranged between a stator of a pump module and the outer housing and the second sealing element is arranged between the separating element and the outer housing.

7. The pump according to claim 1 , wherein the compensation line is arranged in the stator of the pump module or in the separating element.

8. The pump according to claim 1 , wherein a first pump output of the first part pump is in flow communication with the compensation opening of the first pressure chamber by means of the compensation line and with the inlet opening of the second pressure chamber by means of a pressure line.

9. The pump according to claim 1 , wherein the second pressure chamber is formed as a second pump input for the second part pump.

10. The pump according to claim 1 , wherein the second part pump includes a second pump output and the second pump output is in flow communication with the outlet chamber by means of an outlet line.

11. The pump according to claim 10 , wherein the compensation line, the pressure line and the outlet line are arranged in the separating element or the compensation line is arranged in the stator of the pump module and the pressure line and the outlet line are arranged in the separating element.

12. The pump according to claim 1 , wherein the first and second part pumps are arranged so that a first flow direction is oriented in the first part pump and a second flow direction is oppositely oriented in the second part pump.