COUPLING ARRANGEMENT FOR SCREW COUPLING

Abstract

A coupling arrangement is provided for a screw coupling for liquid conduits of a high-pressure cleaning device. The coupling arrangement is connectable in a liquid-tight manner to a further coupling arrangement of the screw coupling, and includes a conduit piece having a channel for liquid under pressure, a multi-start thread for screwing the coupling arrangement to the further coupling arrangement, and a clamping device which is clampable to a clamping face of the further coupling arrangement. The clamping device includes a dimensionally stable clamping ring mount on which a clamping ring is held, wherein the clamping ring is deformable and adaptable to the shape of the clamping face by pressing onto the clamping face of the further clamping arrangement. In addition, a screw coupling with a coupling arrangement of that kind is provided.

Claims

1. A coupling arrangement for a screw coupling for liquid conduits of a high-pressure cleaning device, wherein the coupling arrangement is connectable in a liquid-tight manner to a further coupling arrangement of the screw coupling and comprises a conduit piece having a channel for a liquid under pressure; wherein the coupling arrangement comprises a multi-start thread for screwing the coupling arrangement to the further coupling arrangement of the screw coupling; wherein the coupling arrangement comprises a clamping device which is clampable to a clamping face of the further coupling arrangement; wherein the clamping device comprises a dimensionally stable clamping ring mount on which a clamping ring is held; and wherein the clamping ring is deformable and is adaptable to the shape of the clamping face by pressing onto the clamping face of the further coupling arrangement.

2. The coupling arrangement in accordance with claim 1, wherein the coupling arrangement is releasably connectable to the further coupling arrangement of the screw coupling.

3. The coupling arrangement in accordance with claim 1, wherein the coupling arrangement comprises a connecting sleeve which is held on the conduit piece and on which the multi-start thread is arranged.

4. The coupling arrangement in accordance with claim 3, wherein the thread is configured as an internal thread of the connecting sleeve.

5. The coupling arrangement in accordance with claim 4, wherein the connecting sleeve forms a screw collar ring which is held on the conduit piece so as to be freely rotatable.

6. The coupling arrangement in accordance with claim 1, wherein the clamping ring mount forms an annular groove in which the clamping ring is arranged.

7. The coupling arrangement in accordance with claim 4, wherein the clamping ring mount forms an annular groove which is arranged on the inside of the connecting sleeve and in which the clamping ring is arranged.

8. The coupling arrangement in accordance with claim 7, wherein the annular groove is arranged between the internal thread and a free end face of the connecting sleeve.

9. The coupling arrangement in accordance with claim 1, wherein the clamping ring in the deformed state forms a conical annular face.

10. The coupling arrangement in accordance with claim 9, wherein the conical annular face is aligned coaxially to the thread longitudinal axis of the thread.

11. The coupling arrangement in accordance with claim 1, wherein the clamping ring in the undeformed state has a round or angular cross sectional area, in particular an oval, circular, rectangular, or trapezoidal cross-sectional area.

12. The coupling arrangement in accordance with claim 1, wherein the clamping ring is connected to the clamping ring mount in a positively-fitting manner.

13. The coupling arrangement in accordance with claim 1, wherein the clamping ring is replaceably held on the clamping ring mount.

14. The coupling arrangement in accordance with claim 1, wherein the clamping ring is elastically deformable.

15. The clamping arrangement in accordance with claim 1, wherein the clamping ring is compressible.

16. The coupling arrangement in accordance with claim 1, wherein the clamping ring consists of plastic, in particular of a polyurethane material.

17. The coupling arrangement in accordance with claim 1, wherein the clamping ring has a hardness of at least 70 shore A, in particular a hardness in the range of 75 shore A to 95 shore A, for example 85 shore A.

18. A hose coupling for liquid conduits of a high-pressure cleaning device, said coupling having a first coupling arrangement in accordance with claim 1 and having a second coupling arrangement which is connectable in a liquid-tight manner to the first coupling arrangement, wherein the second coupling arrangement comprises a second conduit piece having a channel for liquid under pressure, and a second multi-start thread which cooperates with the thread of the first coupling arrangement, and a dimensionally stable clamping face cooperating with the clamping ring of the first coupling arrangement.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG. 1 shows a schematic longitudinal sectional view of a screw coupling with a first coupling arrangement and a second coupling arrangement, which are screwed and clamped together;

[0039] FIG. 2 shows an enlarged depiction of Detail A from FIG. 1, wherein a conduit piece with a nipple of the first coupling arrangement is hidden;

[0040] FIG. 3 shows an enlarged depiction corresponding to FIG. 2 before the screwing and clamping of the two coupling arrangements.

DETAILED DESCRIPTION OF THE INVENTION

[0041] Schematically depicted in the drawing is an advantageous embodiment of a screw coupling in accordance with the invention, which is designated as a whole with the reference numeral 10. The screw coupling comprises a first coupling arrangement 12 in accordance with the invention and a second coupling arrangement 14 which are able to be screwed and clamped together in a liquid-tight manner and separated from each other again as required, without any special tools.

[0042] The first coupling arrangement 12 has a first conduit piece 16 with a through-channel 18. The first conduit piece 16 forms a nipple 20. In the embodiment depicted, a steel pipe 24, which is known per se and is therefore shown only in sections for achieving a better overview, is connected to the end 22 of the conduit piece 16 remote from the nipple 20. The nipple has at a small distance from its free end face 26 a first annular groove 28 in which a sealing ring 30 is arranged, and in a region between the nipple 20 and the steel pipe 24, the first conduit piece 26 has an external circumferential groove 32.

[0043] The first coupling arrangement 12 also has a connecting sleeve 34 which is configured as a screw collar ring 36 in the embodiment depicted. The screw collar ring 36 comprises a circumferential wall 38 which surrounds the nipple 20 while forming an annular space 40 and to which a rear wall 42 connects that is passed through by the first conduit piece 16 and that dips into the circumferential groove 32. The screw collar ring 36 is freely rotatably in the circumferential groove 32 and is mounted so as to be practically non-displaceable in axial direction.

[0044] At a small distance from the rear wall 42, a multi-start internal thread 46 is arranged on the inside 44 of the circumferential wall 38. In the embodiment depicted, the internal thread 46 is of quadruple-thread configuration.

[0045] Remote from the rear wall 42, the screw collar ring 36 has a free end face 48. In the region between the internal thread 46 and the free end face 48, arranged on the inside 44 of the circumferential wall 38 is a clamping device 50 which is depicted enlarged in FIGS. 2 and 3. The clamping device 50 comprises a clamping ring mount 52, which is configured in the embodiment depicted as a second annular groove 54, and a clamping ring 56 which is held in the second annular groove 54.

[0046] The clamping ring 56 is elastically compressible and deformable. In the embodiment depicted, the clamping ring 56 consists of plastic, in particular of a polyurethane material. The clamping ring 56 has a hardness of 85 shore A in the embodiment depicted.

[0047] The second coupling arrangement 14 has a second conduit piece 58 with a through-channel and a sleeve-shaped receiving region 60 into which the nipple 20 of the first coupling arrangement 12 is able to be inserted with the interposition of the sealing ring 30, as is depicted in FIG. 1. On its outside, the second conduit piece 58 bears an external thread 62 of quadruple-thread configuration which is formed complementarily to the internal thread 46 of quadruple-thread configuration of the first coupling arrangement 12 and which is arranged at a small distance from the free end 64 of the sleeve-shaped receiving region 60. At a distance from the external thread 62, the second conduit piece 58 has on its outside an outer cone 66 which forms a conical clamping face 68. The outside diameter of the outer cone 66 enlarges continuously with increasing distance from the free end 64 of the receiving region 60.

[0048] When inserting the nipple 20 into the receiving region 60, the second conduit piece 58 dips into the annular space 40 between the nipple 20 and the screw collar ring 36, and the external thread 62 may be screwed to the internal thread 46. The elastically deformable and compressible clamping ring 56 comes into abutment against the conical clamping face 68 and is increasingly deformed, wherein it adapts to the shape of the clamping face 68 and is pressed between the second conduit piece 58 and the screw collar ring 36.

[0049] The clamping ring 56 has in its undeformed state depicted in FIG. 3 a rectangular cross-sectional area. By pressing onto the clamping face 68, the clamping ring 56 deforms in such a way that it has a trapezoidal shape in the deformed state depicted in FIG. 2, wherein it lies with a conical annular face 70 in areal contact against the clamping face 68. The conical annular face 70 is formed complementarily to the conical clamping face 68 and is aligned coaxially to the longitudinal axis 72 of the two conduit pieces 16 and 58, wherein the longitudinal axis 72 also forms a thread longitudinal axis of the internal thread 46 and the external thread 62.

[0050] As is clear in particular from FIGS. 2 and 3, the second annular groove 54 is configured to be rectangular in cross section and the clamping ring 56 is connected to the second annular groove 54 in a positively-fitting manner by it completely filling the second annular groove 54. In a region protruding out of the second annular groove 54, the clamping ring 56 forms the ring face 70 which is of conical configuration in the deformed state.

[0051] The clamping ring 56 is preferably replaceably held in the second annular groove 54, such that it may be replaced in a simple manner in the case of damage.

[0052] Because the internal thread 46 and the external thread 62 are of quadruple-thread configuration, a liquid-tight screw connection between the first coupling arrangement 12 and the second coupling arrangement 14 may be produced in a simple manner, and by using the clamping ring 56 and the clamping face 68, a clamping effect may be produced, which prevents an unintentional release of the screw connection. The requirements for the dimensional accuracy of the dimensionally stable clamping face 68 and the dimensionally stable clamping ring mount 52 may be kept relatively low. This enables an inexpensive production of the two coupling arrangements 12 and 14 and thus also of the hose coupling 10 as a whole.