ROTOR NOZZLE

Abstract

A rotor nozzle for high pressure cleaning devices, having a nozzle housing that has an inlet opening at its axially one end and an outlet opening for liquid at the other end, and having a rotor which is arranged in the nozzle housing, whose front end facing the outlet opening is supported at a bearing, which may be at least partly flowed through by the liquid, and which may be set into rotation by liquid flowing into the nozzle housing. wherein the bearing has at least two bearing sides and may be placed into the nozzle housing in at least two different orientations in which the rotor is respectively supported at another one of the bearing sides.

Claims

1. A rotor nozzle comprising: a nozzle housing that has an inlet opening at its axially one end and an outlet opening for liquid at the other end; and a rotor which is arranged in the nozzle housing, whose front end facing the outlet opening is supported at a bearing, which is configured to be flowed through at least partly by the liquid, and which is configured to be set into rotation by liquid flowing into the nozzle housing, wherein the bearing has at least two bearing sides and is configured to be placed into the nozzle housing in at least two different orientations in which the rotor is respectively supported at another one of the bearing sides.

2. The rotor nozzle in accordance with claim 1, wherein the bearing is designed as a reversible bearing.

3. The rotor nozzle in accordance with claim 1, wherein the bearing has an even number of bearing sides that oppose each other pairwise, wherein the bearing sides of the or of each pair of bearing sides face in opposite directions.

4. The rotor nozzle in accordance with claim 1, wherein the bearing sides are each designed as concave.

5. The rotor nozzle in accordance with claim 1, wherein the bearing sides are of identical design.

6. The rotor nozzle in accordance with claim 1, wherein a passage for liquid flowing out of the rotor is provided between the two bearing sides.

7. The rotor nozzle in accordance with claim 1, wherein the bearing is provided with a peripheral groove for a seal.

8. The rotor nozzle in accordance with claim 1, wherein the nozzle housing has a seat for an exactly fitting reception of the bearing.

9. The rotor nozzle in accordance with claim 1, wherein the bearing is removable and insertable via the end of the nozzle housing at the inlet side.

10. (canceled)

11. The rotor nozzle in accordance with claim 4, wherein the bearing sides are each designed as to flare outwardly in conical form, funnel form, or cup form.

12. A bearing for use in a rotor nozzle comprising: a nozzle housing that has an inlet opening at its axially one end and an outlet opening for liquid at the other end; and a rotor which is arranged in the nozzle housing, which is configured to be flowed through at least partly by the liquid, and which is configured to be set into rotation by liquid flowing into the nozzle housing, the bearing comprising: at least two bearing sides configured to be placed into the nozzle housing in at least two different orientations in which a front end of the rotor facing the outlet opening is respectively supported at the bearing sides.

13. The bearing in accordance with claim 12, wherein the bearing is designed as a reversible bearing.

14. The bearing in accordance with claim 12, wherein the bearing has an even number of bearing sides that oppose each other pairwise, wherein the bearing sides of the or of each pair of bearing sides face in opposite directions.

15. The bearing in accordance with claim 12, wherein the bearing sides are each designed as concave.

16. The bearing in accordance with claim 12, wherein the bearing sides are of identical design.

17. The bearing in accordance with claim 12, wherein a passage for liquid flowing out of the rotor is provided between the two bearing sides.

18. The bearing in accordance with claim 12, wherein the bearing is provided with a peripheral groove for a seal.

19. The bearing in accordance with claim 12, wherein the nozzle housing has a seat for an exactly fitting reception of the bearing.

20. The bearing in accordance with claim 12, wherein the bearing is removable and insertable via the end of the nozzle housing at the inlet side.

21. The bearing in accordance with claim 15, wherein the bearing sides are each designed as to flare outwardly in conical form, funnel form, or cup form.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present disclosure will be described in the following by way of example with reference to the drawing. There are shown:

[0027] FIG. 1 a side view of a rotor nozzle in accordance with an embodiment of the present disclosure;

[0028] FIG. 2 a longitudinal section through the rotor nozzle of FIG. 1;

[0029] FIG. 3 an enlarged representation of the region of the rotor nozzle of FIG. 2 at the outlet side; and

[0030] FIG. 4 a perspective view of a bearing for a rotor nozzle in accordance with the present disclosure.

DETAILED DESCRIPTION

[0031] The rotor nozzle in accordance with the present disclosure shown in FIGS. 1, 2, and 3 comprises a nozzle housing 11 which in some embodiments is manufactured from metal, which is substantially rotationally symmetrical with respect to a longitudinal axis 35, and in which a rotor space 37 also called a swirl chamber is formed.

[0032] When a plug 33 is screwed into the rear end of the nozzle housing 11 via which the rotor nozzle may be connected in a manner known per se to a supply line, for example in the form of a so-called lance that may in turn be connected to a high pressure cleaning device that supplies a liquid, such as water, to the rotor nozzle at high pressure. The pressurized liquid enters via one or more bores, not shown, in the plug 33 into the rotor space 37 such that an eddy flow is created and thereby a rotor 19 arranged in the rotor space 37 is set into rotation about the longitudinal axis 35.

[0033] This functional principle of a rotor nozzle is familiar to the skilled person so that is does not need to be looked at more closely here.

[0034] A seat 31 for a bearing 17 also shown in FIG. 4 is formed in the region of a front outlet opening 15 in the nozzle housing 11 and is arranged with an exact fit in the seat 31 during operation and is supported at a shoulder bounding the outlet opening 15.

[0035] The bearing 17 that is formed in one piece and in which in some embodiments is manufactured from a ceramic material has a circular cylindrical base shape that is outwardly provided with a peripheral groove 27 (cf. FIG. 4) that serves for the reception of an O ring seal 29 (cf. FIG. 3), whereby it is prevented that the liquid moves outwardly past the bearing 17 to the outlet opening 15 in the region of the seat 31 during operation.

[0036] The bearing 17 is designed as a reversible bearing that has two identical bearing sides 21, 23 that each have a cup-like recess having a centrally arranged bearing surface for the front end of the rotor 19. The two bearing sides 21, 23 are connected to one another via a passage 25. The bearing surface is formed by an inner ring region 41 that concentrically surrounds the passage 25 and an outer ring region 39. The inner ring region 41 and the outer ring region 39 are connected to one another by webs 45 between which recesses 43 are formed. These recesses 43 are not openings, i.e. the two bearing sides 21, 23 are only connected to one another via the central passage 25. The recesses 43 may facilitate the manufacture of the bearing 17. In general, such recesses 43 may be dispensed with and the bearing sides 21, 23 may each be formed as smooth.

[0037] In the embodiment shown, the bearing 17 is designed as symmetrical with respect to a plane that is defined by the peripheral groove 27 and thus extends perpendicular to the center axis of the cylindrical base shape of the bearing 17 and thus perpendicular to the longitudinal axis 35 of the nozzle housing 11 with an inserted bearing 17.

[0038] During operation, the rotor 19 runs on a cone about the longitudinal axis 35, with the rotor 19 rolling off and/or sliding at the conical inner wall of the nozzle housing 11 in dependence on the respective circumstances. Depending on the specific design of the rotor nozzle, the rotor 19 may additionally carry out a rotation about its own longitudinal axis. The liquid flowing through an inner channel 20 of the rotor 19 to its front end forms a conical jet exiting the outlet opening 15 with a rotor 19 rotating in this manner. The kinematics of such a rotor nozzle that are generally familiar to the skilled person do not need to be looked at in any more detail at this point.

[0039] The movement of the rotor 19 during operation results in wear of the respectively used bearing side and in this respect in particular of the bearing surface 41. To put the respective other bearing side into operation in the wear case, the bearing 17 may be urged via the outlet opening 15 into the rotor space 37 and may be removed via the inlet opening 13 after removal of the plug 33 or may be gripped by a tool or by hand and may be arranged in the seat 31 again in the corresponding new orientation.

[0040] The service life of the rotor nozzle before the bearing 17 has to be replaced with a new bearing is hereby doubled.