ROTOR NOZZLE FOR A HIGH-PRESSURE CLEANING APPARATUS

Abstract

A rotor nozzle for a high-pressure cleaning apparatus is provided, with a housing having an inlet opening tangentially into the housing and an outlet arranged on an end wall and on which is arranged a pan-shaped, centrally broken recess. A nozzle body arranged in the housing, having a through channel, and supported with a spherical end in the pan-shaped recess has a longitudinal axis tilted toward the longitudinal axis of the housing. The nozzle body is brought into a revolving movement by liquid flowing through the housing and supported on a support surface, of which flow resistance elements, each having one baffle surface, are arranged downstream of on the wall of the housing. A guiding surface is arranged upstream of each baffle surface and is continuously adjoined by the baffle surface, wherein the guiding surface is aligned obliquely to a radial plane of the housing.

Claims

1. A rotor nozzle for a high-pressure cleaning apparatus with a housing having at least one inlet opening tangentially and an outlet which is arranged on an end wall of the housing and on which is arranged a bearing with a pan-shaped, centrally broken recess, and with a nozzle body which is arranged in the housing, has a through channel, and is supported with a spherical end in the pan-shaped recess, the longitudinal axis of which nozzle body is tilted toward the longitudinal axis of the housing and which nozzle body is brought into a revolving movement by the liquid flowing through the housing, in which revolving movement the longitudinal axis of the nozzle body revolves on a conical shell and the nozzle body is supported with a contact surface on its circumference on a support surface, wherein several flow resistance elements are arranged downstream of the support surface on the wall of the housing in the circumferential direction at a distance to one another, which flow resistance elements respectively have one baffle surface protruding into the housing for impinging liquid, wherein a guiding surface is arranged directly upstream of each baffle surface with respect to the flow direction of the liquid, which guiding surface is continuously adjoined by the baffle surface, wherein the guiding surface is aligned obliquely to a radial plane with respect to the longitudinal axis of the housing.

2. The rotor nozzle according to claim 1, wherein the baffle surfaces are at least in sections arranged in a radial plane with respect to the longitudinal axis of the housing.

3. The rotor nozzle according to claim 1, wherein the guiding surfaces are curved in the shape of an arc at least in sections.

4. The rotor nozzle according to claim 1, wherein each guiding surface, in combination with the baffle surface adjoining the guiding surface, forms a channel-shaped expansion of the internal space of the housing.

5. The rotor nozzle according to claim 1, wherein a plurality of baffle surfaces and guiding surfaces are arranged alternatingly one behind the other with respect to the flow direction of the liquid.

6. The rotor nozzle according to claim 1, wherein each guiding surface, in combination with the baffle surface adjoining the guiding surface, forms an S-shaped or sawtooth-shaped contour in a plane aligned orthogonally to the longitudinal axis.

7. The rotor nozzle according to claim 1, wherein the flow resistance elements are formed in a wall of the housing.

8. The rotor nozzle according to claim 1, wherein the flow resistance elements are formed by an insert that is adapted to be inserted into the housing.

9. The rotor nozzle according to claim 8, wherein the insert has a constant wall thickness along its circumference.

10. The rotor nozzle according to claim 8, wherein the insert is adapted to be connected to the housing in a rotationally fixed and axially unmovable manner.

11. The rotor nozzle according to claim 8, wherein the insert is adapted to be screwed to the housing and has a stop surface, which, in the final position of the insert, rests against an inner shoulder of the housing.

12. The rotor nozzle according to claim 11, wherein the insert has an external thread, which interacts with a first internal thread of the housing.

13. The rotor nozzle according to claim 11, wherein the screw-in direction of the insert corresponds to the flow direction of the liquid in the internal space of the housing.

14. The rotor nozzle according to claim 12, wherein the first internal thread is a multi-start thread.

15. The rotor nozzle according to claim 12, wherein the rotor nozzle has a connecting part that is adapted to be connected to the housing to connect to a liquid supply line.

16. The rotor nozzle according to claim 15, wherein the connecting part has an external thread, which is adapted to be screwed into a second internal thread of the housing.

17. The rotor nozzle according to claim 16, wherein the direction of rotation of the second internal thread corresponds to the direction of rotation of the first internal thread.

18. The rotor nozzle according to claim 16, wherein the direction of rotation of the second internal thread is opposed to the direction of rotation of the first internal thread.

19. The rotor nozzle according to claim 15, wherein the connecting part is connected in a rotationally fixed manner to the housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG. 1 a longitudinal sectional view of a first advantageous embodiment of a rotor nozzle according to the invention with a housing, in which an insert and a nozzle body are arranged;

[0034] FIG. 2 a longitudinal sectional view of a housing lid of the rotor nozzle of FIG. 1;

[0035] FIG. 3 a lateral view of the insert of the rotor nozzle of FIG. 1;

[0036] FIG. 4 a sectional view of the insert along the line 4-4 in FIG. 3;

[0037] FIG. 5 a sectional view of a housing lid of a second advantageous embodiment of a rotor nozzle according to the invention, and

[0038] FIG. 6 a sectional view of the housing lid along the line 6-6 in FIG. 5.

DETAILED DESCRIPTION OF THE INVENTION

[0039] FIGS. 1 to 4 schematically show a first advantageous embodiment of a rotor nozzle according to the invention, which rotor nozzle is overall denoted by the reference symbol 10. The rotor nozzle 10 has a housing 12 with a housing bottom 14 and a housing lid 16. The housing bottom 14 is designed to be disk-shaped and has several tangential inlets 18, which open into an internal space 20 of the housing 12. The internal space 20 is surrounded by the housing lid 16 and tapers starting from the tangential inlets 18 toward an outlet 22, which is arranged on an end wall 24 of the housing lid 16.

[0040] Via the tangential inlets 18, pressurized liquid can be supplied to the internal space 20, which liquid rotates about a housing longitudinal axis 26 in the internal space 20 and can exit the housing 12 via the outlet 22.

[0041] Directly upstream of the outlet 22, a bearing in the form of a bearing ring 28 is arranged in the internal space 20, which bearing ring forms a pan-shaped recess 30. On its outside, the bearing ring 28 carries a sealing ring 32 and is thereby sealed with respect to the housing lid 16.

[0042] Upstream of the bearing ring 28, the housing lid 16 has a first internal thread 34, which is designed as a multi-start thread. In the exemplary embodiment shown, the first internal thread 34 is designed to be double-threaded. Upstream of the first internal thread 34, the housing lid 16 forms an inner shoulder 36 and, upstream of the inner shoulder 36, the housing lid 16 is designed in the shape of a conical contact region 38. Upstream of the conical contact region 38, the housing lid 16 forms a smooth support surface 40 without any profile, which support surface is designed to be conical in the exemplary embodiment shown. On the side facing away from the outlet 22, the housing lid 16 has a second inner shoulder 42 at a distance to the support surface 40, against which second inner shoulder the housing bottom 14 rests.

[0043] On the side facing away from the outlet 22, the housing lid 16 forms a second internal thread 44 at a distance to the second inner shoulder 42, the direction of rotation of which second internal thread corresponds to the first internal thread 34 in the exemplary embodiment shown. Alternatively, the direction of rotation of the second internal thread 44 can be opposed to the direction of rotation of the first internal thread 34.

[0044] An insert 46 shown schematically in FIGS. 3 and 4 is screwed into the housing lid 16. The insert 46 has an external thread 48, which can be screwed to the first internal thread 34 of the housing lid 16. Upstream of the external thread 48, the insert 46 forms a plurality of flow resistance elements 50, which are disposed evenly in the circumferential direction and which respectively have one baffle surface 52. A guiding surface 54 is arranged upstream of each baffle surface 52 with respect to the flow direction of the liquid. The baffle surfaces and guiding surfaces 52, 54 are arranged alternatingly with each other in the circumferential direction of the insert 46 and transition into each other continuously. In a plane aligned orthogonally to the housing longitudinal axis 26, the baffle surfaces and guiding surfaces form an S-shaped contour in the exemplary embodiment shown as both the baffle surfaces 52 and the guiding surfaces 54 are curved in an arc shape. The baffle surfaces 52 have an end portion 56 aligned in a radial plane with respect to the housing longitudinal axis 26. This can be clearly seen in FIG. 4. Each guiding surface 54 forms, in combination with the adjoining baffle surface 52, a channel-shaped expansion 55, which is aligned obliquely to the longitudinal axis 26 of the housing 12.

[0045] In the circumferential direction, the insert 46 has in the region of the baffle surfaces and guiding surfaces 52, 54, a constant material thickness. This facilitates the production of the insert 46 in an injection molding process.

[0046] The insert 46 extends from the first internal thread 34 of the housing lid 16 to an upstream edge 58 of the conical contact region 38 so that the support surface 40 is not impaired by the insert 46.

[0047] In the transition region between the external thread 48 and the flow resistance elements 50, the insert 46 forms on its outside a stop surface 60 and the insert 46 can be screwed with its external thread 48 into the first internal thread 34 until the stop surface 60 rests against the first inner shoulder 36 of the housing lid 16.

[0048] After screwing the insert 46 into the housing lid 16, a nozzle body 62 can be inserted into the internal space 20, which nozzle body is supported with a spherical end 64 in the pan-shaped recess 30 of the bearing ring 28. The nozzle body 62 has a nozzle 66, which forms the spherical end 64, and a nozzle carrier 68, which has a through channel 72 extending in the axial direction along a longitudinal axis 70 of the nozzle body 62. The nozzle 66 is pressed into the through channel 72. The nozzle 66 has a nozzle channel 74 with is aligned to be flush with the through channel 72. In its end region facing away from the nozzle 66, the through channel 72 expands in a stepped manner. In the region of the expansion, a solid body, in the form of a steel ball 76, amplifying the centrifugal force, is held. Adjoining the steel ball 76 in the through channel 72 in the direction of the nozzle 66 is a rectifier 78, which has two walls standing orthogonally one above the other, extending parallelly to the longitudinal axis 70 of the nozzle body 62, and penetrating the through channel 72 diametrically.

[0049] Liquid can flow around the steel ball 76 in the through channel 72 so that the liquid, after passing the rectifier 78 and the nozzle 66, can flow through the bearing ring 28 and the outlet 22 and exit the rotor nozzle 10.

[0050] At the height of the rectifier 78, the nozzle carrier 68 has an annular groove extending in the circumferential direction, in which annular groove an O-ring 86 is held in a rotationally fixed manner. With respect to the longitudinal axis 70 of the nozzle body 62, the O-ring 86 protrudes in the radial direction beyond the nozzle carrier 68. Said O-ring forms a contact surface, with which the nozzle body 62 can rest against the support surface 40 of the housing lid 16. This can be clearly seen in FIG. 1.

[0051] With respect to the longitudinal axis 70, the nozzle body 62 extends across at least a third of its total length in the region upstream of the insert, i.e., in the region between the insert 46 and the housing bottom 14.

[0052] The channel-shaped expansions 55 are aligned parallelly to the longitudinal axis 70 of the nozzle body 62.

[0053] The housing 12 of the rotor nozzle 10 is screwed to a connecting part 88, via which the housing 12 can be supplied with pressurized liquid from a high-pressure cleaning apparatus. For this purpose, the connecting part 88 has an external thread 90, which can be screwed into the second internal thread 44 of the housing lid 16.

[0054] Liquid supplied via the connecting part 88 to the housing 12 arrives through the tangential inlets 18 in the internal space 20 of the housing 12 and can exit the internal space 20 via the through channel 72, the nozzle channel 74, the bearing ring 28, and the outlet 22. During operation of the rotor nozzle 10, the internal space 20 is filled with liquid, which is brought into rotation about the housing longitudinal axis 26 by the liquid flowing in through the tangential inlets 18. A liquid column rotating about the housing longitudinal axis 26 thus forms in the internal space 20. The rotating liquid column carries along the nozzle body 62 supported with its spherical front end 64 on the bearing ring 28 so that said nozzle body also rotates about the housing longitudinal axis 26. The nozzle body 62 rests against the circular cylindrical support surface 40 via the O-ring 86 held on the nozzle body 62 in a rotationally fixed manner. The longitudinal axis 70 of the nozzle body 62 is thus tilted toward the housing longitudinal axis 26.

[0055] In the region of the insert 46, the liquid flowing around the housing longitudinal axis 26 experiences a deceleration as a result of the baffle surfaces 52, which is struck by a portion of the revolving liquid. In the process, liquid is supplied via the guiding surfaces 54 to respectively one baffle surface 52 so that an effective deceleration of the liquid can be achieved. Upstream of the insert 46, the liquid does however not experience any deceleration. This ensures that the nozzle body 62 is reliably brought into rotation about the housing longitudinal axis 26 by the liquid. In this region, the nozzle body 62 is only located on one side of the housing longitudinal axis 26, whereas the nozzle body 62 crosses the housing longitudinal axis 26 in the region of the insert 46 and the nozzle 66. This can be clearly seen in FIG. 1. The liquid flowing around the nozzle body 62 could drive the nozzle body 62 in the region in which it crosses the housing longitudinal axis 26 to a self-rotation about the longitudinal axis 70 of the nozzle body 62. Since the liquid is, however, decelerated in this region by the flow resistance elements 50, the self-rotation of the nozzle body 62 can be kept low. In addition, the provision of the flow resistance elements 50 achieves a limitation of the rotational speed that the nozzle body 62 has in its rotational movement about the housing longitudinal axis 26. The reduction of the self-rotation of the nozzle body 62 and the reduction of the rotational speed of the nozzle body 62 about the housing longitudinal axis 26 ensure that the liquid jet exiting the housing 12 is only fanned out unnoticeably. The rotor nozzle 10 is therefore characterized by a particularly large cleaning effect.

[0056] The invention is not limited to the use of a pre-assembled insert 46, which is used in addition to the housing lid 16 and the housing bottom 14. FIGS. 5 and 6 schematically show a housing lid 116 of a second advantageous embodiment of a rotor nozzle according to the invention. The housing lid 116 is designed to be largely identical to the housing lid 16 described above. It is distinguished from the housing lid 16 by the flow resistance elements 118 being formed directly in the housing lid 16. The flow resistance elements 118 are designed to be identical to the flow resistance elements 50 explained above. They respectively have one baffle surface 120, upstream of which is arranged a guiding surface 122. The baffle surfaces and guiding surfaces 120, 122 transition continuously into one another and respectively form a channel-shaped expansion 123. One baffle surface 120 and one guiding surface 122 respectively form an S-shaped contour in a plane aligned orthogonally to the housing longitudinal axis 124. Alternatively, the baffle surfaces and guiding surfaces 120, 122 could also form a sawtooth-shaped contour. In the same way as the guiding surfaces 54 explained above, the guiding surfaces 122 supply liquid to the respective baffle surface 120 following in the revolving movement of the liquid, wherein the liquid is noticeably decelerated on the baffle surface 120.

[0057] The housing lid 116 is used as an alternative to the housing lid 16. The housing bottom 14 can also be inserted into the housing lid 116, and the housing lid 116 can be screwed to the connecting part 88. For this purpose, the housing lid 116 also has, on its end region facing away from the outlet 126, an internal thread 128.

[0058] In the same way as into the housing lid 16 explained above, the nozzle body 62 can also be inserted into the housing lid 116, which nozzle body is driven by the liquid flowing around the housing longitudinal axis 124 to a rotation about the housing longitudinal axis 124, wherein the rotational speed of the nozzle body 62 can be effectively limited by the provision of the flow resistance elements 118. In addition, the use of the flow resistance elements 118 can limit the self-rotation of the nozzle body 62, without its start-up behavior being impaired however.