TENSIONING DEVICE FOR A SCROLL COMPRESSOR

Abstract

A tensioning device for a scroll compressor having at least one frame which has a continuous opening which extends circularly about a central axis and is surrounded by an inner wall of the frame. At least one tensioning sleeve is arranged in the opening of the frame and has a stop section which runs around the central axis and lies flat against the inner wall of the frame with an outer surface. A tensioning section is included which revolves around the central axis and has a continuous recess which extends circularly around the central axis and is surrounded by an inner surface of the tensioning sleeve. At least one tensioning unit which includes at least one tensioning means is arranged between the tensioning sleeve and the frame and by means of which a force can be built up which is uniformly distributed along the circumferential direction.

Claims

1. A tensioning device for a scroll compressor with at least one frame, with a continuous opening running in a circle around a central axis, surrounded by an inner wall of the frame with at least one tensioning sleeve arranged in the opening of the frame with a stop section surrounding the central axis that lies flat against the inner wall of the frame with an outer surface that corresponds to the inner wall of the frame, and that comprises a tensioning section revolving around the central axis, which has a continuous recess running in a circle around the central axis that is surrounded by an inner surface of the tensioning sleeve on which a workpiece is arranged to lie flat, and with at least one tensioning unit that comprises at least one tensioning means that is arranged between the tensioning sleeve and the frame and through which a force, distributed evenly along the perimeter direction or the central axis and acting on the tensioning section in the direction of the central axis can be increased, wherein the tensioning section of the tensioning sleeve is configured to, by the force acting on the tensioning section from a basic position where the interior diameter of the recess is at a maximum, be transferred to at least one tensioning position in which the interior diameter of the recess is reduced in relation to the base position.

2. The tensioning device according to claim 1, wherein the tensioning sleeve comprises a groove-like cavity extending transversely to the central axis in the circumferential direction, which is arranged in the outer side of the stop section, which is completely circumferential with respect to the central axis and which is open in the direction of the frame, wherein the tensioning section delimits the cavity as a whole or at least in sections on the side facing away from the outside and whereby at least one of the at least one tensioning means can be arranged or is arranged in the cavity.

3. The tensioning device according to claim 1, wherein the tensioning sleeve comprises at least two material weakening sections which are arranged on both sides of the tensioning section in each case between the stop section and the tensioning section and connect the tensioning section to the stop section, which delimit the cavity between the tensioning section and the stop section and which are malleable when the force is built up by the tensioning means.

4. The tensioning device according to claim 1, wherein the tensioning section is disc-shaped and comprises an inner edge region, which comprises the inner surface against which the workpiece rests for tensioning, an outer edge region, which adjoins the cavity, and a disc-shaped intermediate region, which connects the inner edge region to the outer edge region and absorbs the load and force.

5. The tensioning device according to claim 4, wherein the intermediate region is solid or in that the intermediate region comprises multiple spoke-like supporting elements that are evenly distributed around the central axis and extend from the inner edge area to the outer edge area, wherein two adjacent supporting elements, inner edge area and outer edge area surround a free cut that is material-free.

6. The tensioning device according to claim 5, wherein at least one of the multiple spoke-like support elements in a plane transverse to the central axis comprises a cross-section that widens from the inner edge region to the outer edge region and/or in that at least one of the multiple spoke-like support elements in a plane transverse to the central axis comprises a V-type or Y-type cross-section that opens outwards with respect to the central axis.

7. The tensioning device according to claim 5, wherein at least one of the at least one free cut comprises a rounded cross-section in a plane transverse to the central axis and/or comprises rounded corners.

8. The tensioning device according to claim 1, wherein the stop section, the tensioning section and the material weakening sections of the tensioning sleeve form a common one-piece component and/or in that the tensioning sleeve and frame form two separate components or components which can be separated from one another.

9. The tensioning device according to claim 1, wherein the frame has a cut-out extending transversely or obliquely to the central axis, which extends from an outer wall of the frame to the inner wall of the frame and which opens into the cavity.

10. The tensioning device according to claim 9, wherein the tensioning means of the tensioning unit comprises a fluid which can be introduced into the cavity via the cut-out in the frame and in that the tensioning unit comprises a pressure build-up mechanism by means of which the fluid arranged in the cavity can be pressurised, wherein the force acting in the direction of the central axis comprises a compressive force.

11. The tensioning device according to claim 1, wherein at least two sealing mechanisms, which are each arranged between the stop surface of the tensioning sleeve and the inner wall of the frame, which are each designed to be completely circumferential with respect to the central axis and which, viewed in the direction of the central axis, are spaced apart from one another and arranged on opposite sides with respect to the cavity.

12. The tensioning device according to claim 1, wherein at least one ring, tyre or disc-like stopping mechanism, which is fixed to the frame and which protrudes with respect to the inner wall of the frame in the direction of the central axis and limits movement of the tensioning sleeve along a joint direction running parallel to the central axis, along which the tensioning sleeve can be inserted into the opening of the frame when arranged in the frame, upon reaching an end position in which the tensioning sleeve is in contact with the step area.

13. The tensioning device according to claim 12, wherein at least one ring, tyre or disc-like rear gripping mechanism, which is detachably fixable or fixed to the frame on the side facing away from the stopping mechanism, which extends in the direction of the central axis and overlaps the tensioning sleeve transversely to the central direction at least in sections and which engages behind the clamping sleeve arranged in the frame to prevent it from moving against the joint direction.

14. The tensioning device according to claim 12, wherein the stopping mechanism and/or the rear gripping mechanism can be fixed or secured to the frame in a detachable manner, in particular by means of force-fit and/or form-fit, or in a non-detachable manner, in particular by means of material, force and/or form-fit.

15. The tensioning device according to claim 12, wherein the frame and the stopping mechanism form a common one-piece component.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings show:

[0042] FIG. 1A perspective front view of an exemplary embodiment of the tensioning device;

[0043] FIG. 2A sectional view of the embodiment example shown in FIG. 1;

[0044] FIG. 3A top view of a tensioning sleeve in the embodiment example shown in FIG. 1

[0045] FIG. 4A top view on a sectional view of a tensioning sleeve in a second embodiment example of the tensioning device;

[0046] FIG. 5A top view on a sectional view of a tensioning sleeve in a third embodiment example of the tensioning device;

[0047] FIG. 6A top view on a sectional view of a tensioning sleeve in a fourth embodiment example of the tensioning device;

DETAILED DESCRIPTION

[0048] The figures show embodiment examples of a tensioning device for a scroll compressor given the overall reference number 2. The tensioning device 2 comprises a frame 4. A continuous opening 8, circularly formed around a central axis 6 is arranged in the frame 4. The opening 8 is surrounded by an inner wall 10 of the frame 4.

[0049] A tensioning sleeve 12 is arranged in the opening 8 of the frame 4 of the tensioning device 2. The tensioning sleeve 12 comprises a contact section 14 surrounding the central axis 6, which lies flat against the inner wall 10 of the frame 4 with an outer surface 16 that corresponds to, in particular complements, the inner wall 10 of the frame 4. The tensioning sleeve 12 comprises a tensioning section 18 that surrounds the central axis 6. This comprises a continuous recess 20, arranged running circularly around the central axis 6. The recess 20 is surrounded by an inner surface 22 of the tensioning sleeve 12. A workpiece, in particular an f-scroll or o-scroll, can be placed against the tensioning section 18, in particular against the inner surface 22.

[0050] Furthermore, the tensioning device 2 comprises a tensioning unit 24 that comprises at least one tensioning means 26 that is arranged between tensioning sleeve 12 and frame 4. The tensioning means 26 of the tensioning unit 24 can be used to build up a force that is evenly distributed along the circumferential direction with respect to the central axis 6 and acts on the tensioning section 18 in the direction of the central axis 6. As a result of this built-up force, the tensioning section 18 of the tensioning sleeve 12 can be transferred from a basic position, in which the inside diameter of the recess 20 is at a maximum, to at least one tensioning position, in which the inside diameter of the recess 20 is reduced with respect to the basic position.

[0051] In the embodiment examples shown in the figures the tensioning means 26 of the tensioning unit 24 is formed by a fluid that can be pressurised via a pressure build-up mechanism 28. For this purpose, the tensioning sleeve 12 comprises a groove-like cavity 30 extending transversely to the central axis 6 in the circumferential direction, which is arranged in the outer side of the contact section 14, which is completely circumferential with respect to the central axis 6 and which is open in the direction of the frame 4. In order to add fluid to the cavity 30 a cut-out 32 is arranged in the frame 4 and is in fluid connection with the cavity 30 and the pressure build-up mechanism 28.

[0052] In order to prevent fluid from escaping, the tensioning device 2 comprises two sealing mechanisms 34 that are each arranged between the contact surface 16 of the tensioning sleeve 12 and the inner wall 10 of the frame 4, each of which is completely circumferential with respect to the central axis 6 and which, viewed in the direction of the centre axis 6, are spaced apart and arranged on opposite sides with respect to the cavity 30.

[0053] In the embodiment examples shown in the figures for the tensioning device 2, a tensioning section 18 of the tensioning sleeve 12 is designed as a disc. For this purpose, the tensioning section 18 of the tensioning sleeve 12 comprises an inner edge area 36, which comprises the inner surface 22 against which the workpiece rests for tensioning, an outer edge area 38, which adjoins the cavity 30, and a disc-shaped intermediate area 40, which connects the inner edge area 36 to the outer edge area 38 and absorbs the load and force.

[0054] The tensioning section 18 of the tensioning sleeve 12 is connected to the contact section 14 of the tensioning sleeve 12 via material weakening sections 42.

[0055] In order to fix the tensioning sleeve 12 in the frame 4 against movement parallel to the central axis 6, the tensioning device 2 comprises a stopping mechanism 44 that is attached in the embodiment example show in the figures to the frame 4 and protrudes in the direction of the central axis 6. Stopping mechanism 44 and frame 4 are a one-piece, common component. On the side opposite the stopping mechanism 44 the tensioning device 2 comprises a rear gripping mechanism 46 that is detachable in the embodiment example shown in the figures, namely by means of screwing to the frame 4.

[0056] FIG. 3 shows a top view of a tensioning sleeve 12 of a first embodiment example of the tensioning device 2. In this embodiment, the intermediate area 40 is formed by multiple spoke-like support elements 48. These comprise a V-type or Y-type cross section in the embodiment example shown in FIG. 3.

[0057] FIG. 4 shows a second embodiment example of the tensioning device 2. In this embodiment, the tensioning sleeve 12 comprises an intermediate area 40 in a solid design.

[0058] FIG. 5 shows a third embodiment example of the tensioning device 2, in which the tensioning sleeve 12 also comprises an intermediate area 40 with spoke-like support elements 48. However, the support elements 48 are designed in substantially rectilinear fashion. The free cuts 50 arranged between the support elements 48 have a rounded cross-section.

[0059] FIG. 6 shows a fourth embodiment example of the tensioning device 2, in which the intermediate area 40 comprises spoke-like support elements 48 that extend from the direction of the inner edge area 36 to the outer edge area 38.

[0060] In the following, the mode of operation of the tensioning device 2 is briefly described:

[0061] This can be tensioned by the tensioning device 2 in order to process a workpiece. For this purpose, a tensioning sleeve 12 is first inserted into the frame 4. This takes place along the joint direction, which runs parallel to the central axis 6. If the tensioning sleeve 12 has reached its target position, then the tensioning sleeve 12 lies against the stopping mechanism 44 of the frame 4. In order to fix the tensioning sleeve 12 the cover-type rear gripping mechanism 46 is screwed onto the frame 4.

[0062] According to this, only one workpiece can be arranged in the tensioning sleeve 12 in such a way that the workpiece lies against the inner surface 22 of the tensioning section 18 of the tensioning sleeve 12. In order to tension the workpiece the tensioning means 26 is driven by the tensioning unit 24 in such a way that a force is built up which transfers the tensioning section 18 of the tensioning sleeve 12 from its home position to at least one tensioning position. In the embodiment example shown in the figures the pressure of the fluid that is located in the cavity 30 of the tensioning sleeve 12 is increased in such a way that the tensioning section 18 is pushed in the direction of the central axis 6. A relative movement is made possible through the two material weakening sections 42 that connect the tensioning section 18 with the contact section 14. The workpiece is thus secured with a force fit.

[0063] The features of the invention disclosed in the aforementioned description, in the claims as well as in the drawing, both individually and in any combination, may be essential in the realisation of the invention in its various embodiments within the scope of protection of the following claims.

REFERENCE SYMBOL LIST

[0064] 2 Tensioning device [0065] 4 Frame [0066] 6 Central axis [0067] 8 Opening [0068] 10 Inner wall [0069] 12 Tensioning sleeve [0070] 14 Contact section [0071] 16 Outer surface [0072] 18 Tensioning section [0073] 20 Recess [0074] 22 Inner surface [0075] 24 Tensioning unit [0076] 26 Tensioning device [0077] 28 Pressure build-up mechanism [0078] 30 Cavity [0079] 32 Cut-out [0080] 34 Sealing mechanism [0081] 36 Inner edge area [0082] 38 Outer edge area [0083] 40 Intermediate area [0084] 42 Material weakening sections [0085] 44 Stopping mechanism [0086] 46 Rear gripping mechanism [0087] 48 Support element [0088] 50 Free cut