NOZZLE DEVICE FOR A FLUID, METHOD FOR PRODUCING A NOZZLE DEVICE AND KIT COMPRISING A ROTOR AND A HOLLOW NEEDLE FOR A NOZZLE DEVICE

Abstract

A nozzle device (1) for a fluid which comprises a stator (2), which has at least one connection (3) for a fluid line (4), a rotor (5) which is mounted in the stator (2) so as to be rotatable about a rotational axis (A) and has an axial, preferably continuous channel (6), a nozzle carrier (8) for at least one nozzle (9) arranged on a first end (7) of the rotor (6), and comprising a hollow needle (10) which has a continuous passage (11) and is arranged in the channel (6) of the rotor (5) such that the fluid can be conveyed from the fluid line (3) as far as the nozzle carrier (8). According to the invention, the hollow needle (10) is held on the stator (2) so as to be rotationally fixed.

Claims

1-10. (canceled)

11. A nozzle device for a fluid, comprising: a stator which has at least one connection for a fluid line, a rotor which is mounted in the stator so as to be rotatable about an axis of rotation and has an axial duct, wherein a nozzle carrier for at least one nozzle is arranged on a first end of the rotor, and a hollow needle has a continuous passage and is arranged in the duct of the rotor such that the fluid is able to be conducted from the fluid line to the nozzle carrier, and the hollow needle is held in a rotationally fixed manner against the stator.

12. The nozzle device as claimed in claim 11, wherein the axial duct is continuous.

13. The nozzle device as claimed in claim 11, wherein the hollow needle extends substantially over an entire axial length of the duct of the rotor.

14. The nozzle device as claimed in claim 11, wherein at least one outer surface of the hollow needle comprises a wear-resistant material.

15. The nozzle device as claimed in claim 14, wherein the wear-resistant material is a DLC coating.

16. The nozzle device as claimed in claim 11, wherein the hollow needle is held against the stator by a union nut.

17. The nozzle device as claimed in claim 11, wherein the hollow needle has a head, at one end, with a frustoconical head surface.

18. The nozzle device as claimed in claim 17, wherein the stator has a frustoconical surface against which the frustoconical head surface of the hollow needle is supported.

19. The nozzle device as claimed in claim 11, wherein the hollow needle is received in the duct of the rotor without any appreciable play.

20. The nozzle device as claimed in claim 19, wherein the hollow needle and the rotor are paired such that an annular gap size, between the duct and the outer surface of the hollow needle, is at most half a minimum value of a fit tolerance zone of a selected fit.

21. A method of producing a nozzle device as claimed in claim 11, comprising the step of: pairing a rotor with a hollow needle.

22. A kit comprising a rotor and a paired hollow needle for a nozzle device as claimed in claim 11.

Description

[0042] The invention will be described in more detail below on the basis of a preferred exemplary embodiment and in conjunction with the figures. In the figures:

[0043] FIG. 1 shows an axial sectional view through a nozzle device according to the invention;

[0044] FIG. 2 shows a perspective view, partially cut out, of the nozzle device in FIG. 1;

[0045] FIG. 3 shows a perspective view of the hollow needle according to the invention;

[0046] FIG. 4 shows an axial sectional view through the rotor according to the invention; and

[0047] FIG. 5 shows a perspective view of the rotor in FIG. 4.

[0048] FIGS. 1 and 2 show a nozzle device 1 according to the invention. FIGS. 3 or 4 and 5 show details of the hollow needle 10 and of the rotor 5.

[0049] The nozzle device 1 comprises a stator, which is generally provided with the reference sign 2. The stator 2 may however be of multi-part design and comprise further components, which, for the sake of clarity, if not necessary, are always referred to as the stator 2.

[0050] The stator 2 is of hollow design and serves as a housing for further components of the nozzle device 1. The stator 2 has a connection 3 for a fluid line 4, said connections being standardized and known per se to a person skilled in the art.

[0051] A rotor 5 having an axial, continuous duct 6 is arranged in the stator 2. The rotor 5, by means of needle axial ball bearings 17, is mounted in the stator 2 so as to be rotatable about an axis of rotation A. A nozzle carrier 8 is fastened to that end 7 of the rotor 5 which faces away from the connection 3. The fastening of the nozzle carrier 8 to the rotor 5 is realized via a screw connection 18, wherein the outer thread of the rotor is denoted by the reference sign 18 in FIGS. 4 and 5. It goes without saying that, according to the direction of rotation of the rotor, the screw connection 18 (and further screw connections described later) are always designed such that the screw connection 18 is tightened by the rotation of the nozzle carrier 8 or of the rotor 5.

[0052] In the nozzle carrier 8, there are arranged 4 nozzles 9, of which merely 3 can be seen in FIG. 2 owing to the cutout. The nozzles 9 are arranged such that the exiting fluid generates swirl and sets in rotation the rotor 5 together with the nozzle carrier 8. A protective cap 19 is fastened to the nozzle carrier 8 by means of threaded screws, of which merely the bores 20 can be seen.

[0053] In order to control the rotational speed of the rotor 5 in operation, an eddy current brake 21 is arranged in the stator 2.

[0054] In the duct 6 of the rotor 5, which can be seen in FIGS. 4 and 5, there is arranged a hollow needle 10, illustrated separately in FIG. 3, which extends over the entire length of the duct 5. The hollow needle 10 has an axial passage 11 through which the fluid can flow from the fluid line 4 to the nozzle carrier 8 and which opens into a distribution chamber 22 of the nozzle carrier 8. The distribution chamber 22 is connected in a fluid-conducting manner to in each case one nozzle 9 via lines (not illustrated) such that the fluid can flow out of the nozzle device.

[0055] From FIG. 3, it can be seen that the hollow needle 10 has a cylindrical outer surface 12, which is provided with a highly wear-resistant and low-friction coating. At the end facing the connection 3, the hollow needle 10 has a head 14 with a frustoconical head surface 15. The head 14 also has a projection 23 with a stop surface 24 at the transition to the outer surface 12.

[0056] The head surface 15 is supported against a frustoconical surface 16 of the stator 2, as illustrated in FIGS. 1 and 2. A union nut 13 with an outer thread 25 is in a state fitted onto the hollow needle 10 and is screwed firmly to the stator 2 via the outer thread 25. In this case, the stop surface 24 is stopped against an end surface 26 of the union nut 13 and the frustoconical head surface 15 of the hollow needle 10 is pressed against the frustoconical surface 16 of the stator 2. The hollow needle 10 is thereby firstly centered and secondly, by way of self-locking of both frustoconical surfaces 14 and 16 and by way of the contact pressure force, is held in a rotationally fixed manner against the stator 2.

[0057] For the purpose of simplified assembly, the stator 2 comprises a fastening section 27 which is designed to receive the union nut 13 and which is fastened via a thread 28 to the rest of the stator 2.

[0058] The hollow needle 10 is received in the duct 5 without any appreciable play. The low fit tolerance and the length of the hollow needle 10, which extends over the entire length of the duct 6, makes it possible for the rotating components to be sealed off with respect to the static components without the need for resorting to high-wear parts such as seals. The shaft seals shown in the figures prevent bearing lubricating grease from escaping.

[0059] Owing to the highly wear-resistant coating of the outer surface 12 of the hollow needle 10, the service life of the hollow needle 10 and of the rotor 5 is increased. Moreover, depending on the gap size between the outer surface 12 and the duct 6, the hollow needle 10 can act as a slide bearing and additionally stabilize the rotor 5, wherein the fluid flowing in the passage 11 can possibly effect cooling of the hollow needle 10 and of the rotor 5.