Peristaltic Pump

1 . A peristaltic pump comprising planetary rollers configured to revolve around a rotor driving the planetary rollers, wherein the rotor is configured to push the planetary rollers against a flexible tube such that the flexible tube is squeezed between the planetary rollers and a wall of a pump housing, and a toothless contact surface between the rotor and the planetary rollers.

2 . The peristaltic pump according to claim 1 , wherein the contact surface is formed by an elastic material.

3 . The peristaltic pump according to claim 1 , further comprising a rotatable support having supporting arms that are arranged inside the planetary rollers.

4 . The peristaltic pump according to claim 3 , wherein the supporting arms are arranged eccentrically inside the planetary rollers.

5 . The peristaltic pump according to claim 3 , wherein the support is loosely connected to the rotor via the planetary rollers.

6 . The peristaltic pump according to claim 3 , wherein the support comprises two parts that sandwich the planetary rollers inbetween.

7 . The peristaltic pump according to claim 3 , wherein the support comprises two separable rings, at least one of the rings comprising axially projecting ring segments forming at least partially the supporting arms, wherein opposite end faces of the projecting ring segments ( 52 ) in a circumferential direction of the rings are convex.

8 . The peristaltic pump according to claim 1 , further comprising a flexible sleeve provided between the rotor and the planetary rollers and having the contact surface.

9 . The peristaltic pump according to claim 8 , wherein the flexible sleeve has a Shore A hardness of between 40 and 100.

10 . The peristaltic pump comprising planetary rollers configured to revolve around a rotor driving the planetary rollers, wherein the rotor is configured to push the planetary rollers against a flexible tube such that the flexible tube is squeezed between the planetary rollers and a wall of a pump housing, further comprising a drive unit with a drive shaft, and a contactless coupling between the drive shaft and the rotor ( 8 ) for transferring torque from the drive shaft to the rotor.

11 . The peristaltic pump according to claim 1 , further comprising a first sensor element revolving around the rotor at the same speed as the planetary rollers, and a stationary second sensor element configured to detect the revolution of the first sensor element.

12 . The peristaltic pump according to claim 11 , wherein the first sensor element is provided in a receptacle of a supporting arm.

13 . The peristaltic pump according to claim 1 , wherein the rotor comprises a conical section and a cylindrical section, the cylindrical section having the contact surface, and wherein the rotor is axially displaceable from a storage position, in which the conical section or a section with reduced diameter contacts the planetary rollers such that the flexible tube is not squeezed between the planetary rollers and the wall of the pump housing, into an operating position, in which the cylindrical section contacts the planetary rollers such that the planetary rollers are pushed against the flexible tube and the flexible tube is squeezed between the planetary rollers and the wall of the pump housing.

14 . The peristaltic pump according to claim 13 , wherein an edge of the conical section next to the cylindrical section has a larger diameter than the cylindrical section.

15 . The peristaltic pump according to claim 13 , wherein the pump housing has an aperture in which the rotor is axially displaceable from the storage position into the operating position, and wherein the pump housing is provided with an inlet port and an outlet port that are connectable inside the pump housing via the flexible tube.

16 . The peristaltic pump according to claim 6 , wherein the two parts of the support are releasably connected to each other.

17 . The peristaltic pump according to claim 8 , wherein the flexible sleeve has a Shore A hardness of between 60 and 80.