SPIRAL COMPRESSOR

Abstract

A spiral compressor having a stationary spiral element with a stationary spiral wall, a rotating spiral element with a rotating spiral wall arranged on a rotatable plate which is engaged with the stationary spiral wall wherein several compression working spaces are formed, and a guide means intended for guiding the rotating spiral element and with at least two guiding pins arranged in a stationary manner, at least two recesses formed on a back of the rotating spiral element with running sleeves which are inserted therein in a radially movable manner, in which the guiding pins are received such that the inner surface of the running sleeves, during rotation of the rotating spiral element, rotates about the circumference of the guiding pins, and wherein a lock is formed in every recess which prevents an axial protrusion of the running sleeves out of the recesses.

Claims

1-12. (canceled)

13. A spiral compressor, having a stationary spiral element with a stationary spiral wall, a rotating spiral element with a rotating spiral wall arranged on a rotatable plate and which is engaged with the stationary spiral wall in such a way that several compression working spaces are formed, and a guide means intended for guiding the rotating spiral element and with at least two guiding pins arranged in a stationary manner, at least two recesses formed on a back of the rotating spiral element with running sleeves which are inserted therein in a radially movable manner, in which the guiding pins arranged in the stationary manner are received such that the inner surface of the running sleeves, during rotation of the rotating spiral element, rotates about a circumference of the guiding pins, wherein a lock is formed in each of the recesses which prevents an axial protrusion of the running sleeves out of the recesses.

14. The spiral compressor according to claim 13, wherein for axial locking of the running sleeves inserted into the recesses, a material deformation is formed in an edge region of the recesses which is at least selectively directed against an end face of one of the running sleeves.

15. The spiral compressor according to claim 14, wherein the material deformation in the edge region of the recesses for the axial locking of the running sleeves inserted into the recesses is formed with a stem stroke, a notch stroke and/or by beading or crimping.

16. The spiral compressor according to claim 13, wherein the recesses have an undercut at a side of an inner circumference in which an edge region of the inserted running sleeves is deformed by beading or crimping.

17. The spiral compressor according to claim 13, wherein the lock is formed with one respective ring element inserted into each of the recesses.

18. The spiral compressor according to claim 17, wherein in a side of an inner circumference of the recesses, a respective annular groove into which the ring element is inserted is formed.

19. The spiral compressor according to claim 17, wherein the ring element is inserted into each of the recesses (11) through a press-fit.

20. The spiral compressor according to claim 17, wherein the recesses have a cross-section which is enlarged in regions with a landing, wherein the landing serves as a seat for the ring element.

21. The spiral compressor according to claim 13, wherein the running sleeves are arranged in the recesses such that end faces do not protrude over a planar surface on the back of the rotating spiral element and are located below the planar surface.

22. The spiral compressor according to one of the preceding claims, wherein the running sleeves and the guiding pins are formed from a material which has a larger hardness than a material from which the rotating spiral element is formed.

23. The spiral compressor according to claim 22, wherein the running sleeves and the guiding pins are formed from a hard metal, wherein the rotating spiral element is formed from aluminum.

24. The spiral compressor according to claim 13, wherein a material of a disc-shaped sealing element has a lower hardness than a material of the running sleeves.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0031] Further details, features and advantages of embodiments of the invention result from the following description of example embodiments with reference to the accompanying drawings. It is shown:

[0032] FIG. 1: a schematic exploded representation of a spiral compressor known according to the state of the art,

[0033] FIG. 2: a schematic representation of an example embodiment of the back of the rotating spiral element of the spiral compressor according to the invention,

[0034] FIGS. 3A to 3C: enlarged schematic representations of example embodiments of recesses of the back of the rotating spiral element of the spiral compressor according to the invention,

[0035] FIGS. 4A to 4B: enlarged schematic representations of a second embodiment of recesses of the back of the rotating spiral element of the spiral compressor according to the invention,

[0036] FIGS. 5A to 5B: an enlarged schematic sectional representation of a third embodiment of a recess of the back of the rotating spiral element of the spiral compressor according to the invention and a detailed representation of the third embodiment, and

[0037] FIGS. 6A to 6B: an enlarged schematic representation of a fourth embodiment of a recess of the back of the rotating spiral element of the spiral compressor according to the invention and a detailed sectional representation of the fourth embodiment.

DESCRIPTION OF AN EMBODIMENT

[0038] FIG. 1 shows a schematic exploded representation of a spiral compressor known according to the state of the art. The spiral compressor has a stationary spiral element 1 on which a stationary spiral wall is formed. In the perspective representation of FIG. 1, the stationary spiral wall, which is formed on the stationary spiral element 1, is covered by the circumference of the stationary spiral element 1. A rotating spiral element 2 with a rotating spiral wall 3 arranged on a rotatable plate is arranged opposite the stationary spiral element 1. In the assembled state, the rotating spiral wall 3 is engaged with the stationary spiral wall of the stationary spiral element 1 such that several compression working spaces are formed between the interlocking spiral walls.

[0039] For guidance of the rotating spiral element 2, a guide means is provided which has six stationary guiding pins 4 which are received in six recesses 11 formed on a back of the rotating spiral element 2 which are covered in the perspective representation of the rotating spiral element 2. The guiding pins 4 are arranged in a stationary manner in evenly distributed openings 5 of a disc-shaped sealing element 6. The disc-shaped sealing element 6 is arranged between a housing body 7 and the rotating spiral element 2 and has a radially circumferential notch 8 for receiving an O-ring 9 in order to seal the disc-shaped sealing element 6 against the housing body 7. Preferably, the disc-shaped sealing element 6 is not hardened and/or formed from the same material as the housing body 7. The housing body 7 and the disc-shaped sealing element 6 have corresponding openings into which pins 10 for the stationary connection of the disc-shaped sealing element 6 to the housing body 7 are inserted.

[0040] According to the state of the art, a respective radially and axially movable running sleeve 12 is inserted into each of the six recesses 11. In the assembled state of the spiral compressor, the axial and the radial clearance of the running sleeves 12 enables a radial and an axial movement of the running sleeves 12 inserted into the recesses 11.

[0041] The guiding pins 4 are arranged axially opposite the recesses 11, such that the guiding pins 4 in the assembled state of the spiral compressor are received in the running sleeves 12. In doing so, the inner surface of the running sleeves 12 rotates about the circumference of the guiding pins 4 when the rotating spiral element 2 rotates.

[0042] A ring seal 13 with an O-ring 14 is arranged between the rotating spiral element 2 and the disc-shaped sealing element 6.

[0043] In contrast to the embodiment of a spiral compressor according to the state of the art shown in FIG. 1, the axial movability of the running sleeves 12 in the spiral compressor according to the invention is restricted by a respective lock formed in the recesses 11 such that they cannot axially protrude out of the recesses 11.

[0044] FIG. 2 shows a schematic representation of an example embodiment of the back of the rotating spiral element of the spiral compressor according to the invention. On the back of the rotating spiral element 2 which faces the disc-shaped sealing element 6 (not shown), six circular recesses 11 are formed in an equally distributed manner. A running sleeve 12 is inserted into every recess 11, wherein the inner diameters of the recesses 11 are larger than the outer diameters of the running sleeves 12, such that the running sleeves 12 inserted into the recesses 11 have a radial movement clearance. The clearance fit between the running sleeves 12 and the recesses 11 enables a rotation of the running sleeves 12.

[0045] The material of the running sleeves 12 is harder than the material from which the rotating spiral element 2 is formed. Preferably, the running sleeves 12 and the guiding pins 4 are formed from a steel, particularly preferred from a hardened steel.

[0046] In an edge region of the recesses 11, respectively two material deformations 15 selectively directed against an end face of the running sleeves 12 are formed as a lock which restrict an axial movement of the running sleeves 12 in the recesses 11 such that the running sleeves 12 cannot protrude out of the recesses 11 beyond the back of the rotating spiral element 2. The material deformations 15 are selectively carried out stem strokes, whereby the material of the rotating spiral element 2, which, for example, is aluminum, is deformed from the edge of the recesses 11 to the inner side of the respective recess 11 and thus restricts an axial movement of the running sleeve 12 inserted into the respective recess 11. The selective material deformations 15 are formed such that they do not protrude beyond the end faces of the running sleeves 12 into the running sleeves 12. In the shown example, the selective material deformations 15 respectively protrude 0.25 mm into the recesses 11 and thus block the running sleeves 12 against an axial protrusion out of the recesses 11. The width of the selective material deformations 15 is 0.25 mm. The depth of the selective material deformations 15 is 0.2 mm measured from the upper edge of the recesses 11.

[0047] FIGS. 3A to 3C show enlarged schematic representations of example embodiments of recesses 11 of the back of the rotating spiral element 2 of the spiral compressor according to the invention.

[0048] FIG. 3A shows an embodiment in which a running sleeve 12 inserted into a recess 11 is locked against an axial protrusion with an individual material deformation 15 of the edge of the recess 15 selectively formed by a stem stroke.

[0049] FIG. 3B is a detailed representation of a further embodiment of the solution according to the invention, wherein the axial lock of the running sleeve 12 inserted into the recess 11 of the rotating spiral element 2 is formed with three material deformations 15 evenly formed in a selectively distributed manner about the circumference of the edge of the recess 11.

[0050] FIG. 3C shows a further detailed representation of an axial lock formed by material deformation 15 in the edge region of a recess 11 of a running sleeve 12 inserted into the recess 11. The material deformation 15 is formed such that it is directed against the end face of the running sleeve 12 without clamping the running sleeve 12. This makes it possible for the running sleeve 12 in the recess 11 to rotate about its own axis. The material deformation 15 prevents the running sleeve 12 from axially protruding out of the recess beyond the back of the rotating spiral element 2.

[0051] FIGS. 4A to 4B show enlarged schematic representations of a second embodiment of the recesses 11 of the back of the rotating spiral element 2 of the spiral compressor according to the invention. In FIG. 4A, an embodiment of the recess 11 is shown in which the axial lock of the running sleeve 12 inserted into the recess 11 is formed with a material deformation 15 of the edge of the recess 11. The material deformation 15 is obtained by beading the material of the rotating spiral element 2 on the edge of the recess 11 to the interior in the direction of the end face of the running sleeve 12. The beaded edge of the recess 11 protrudes into the recess 11 and thus reduces the cross-section of the recess 11. Due to the reduced cross-section, the running sleeve 12 inserted into the recess 11 is axially locked and cannot protrude out of the recess 11 beyond the back of the rotating spiral element 2.

[0052] FIG. 4B shows an enlarged sectional representation of the embodiment of the recess 11 represented in FIG. 4A with beaded edge for axially locking the running sleeve 12 inserted into the recess 11. The material deformation 15, i.e. the beaded edge, protrudes to the inside against the end face of the running sleeve 12 without axially clamping the running sleeve 12. In doing so, the material deformation 15 does not protrude beyond the end face into the running sleeve 12. The diameter of the recess 11 in the region of the beaded edge is smaller than the outer diameter of the running sleeve 12 and greater than the inner diameter of the running sleeve 12.

[0053] FIGS. 5A to 5B show an enlarged schematic sectional representation of a third embodiment of a recess 11 in the back of the rotating spiral element 2 of the spiral compressor according to the invention, wherein FIG. 5B shows a detailed representation of FIG. 5A.

[0054] FIG. 5A shows a section of the recess 11 with a running sleeve 12 inserted into the recess 11. In this third embodiment, the recess 11 has an annular groove 16 formed on the side of the inner circumference, wherein the running sleeve 12 in the region of the annular groove 16 is deformed such that the material of the running sleeve 12 protrudes into the annular groove 16, whereby the running sleeve 12 is axially locked in the recess 11. The material deformation of the running sleeve 12 in the region of the annular groove 16 can be formed by beading or crimping. The annular groove 16, which is formed on the lower edge of a recess 11, serves as an undercut into which the deformed edge region of the running sleeve 12 protrudes without radially clamping the running sleeve 12 in the recess 11. Thus, the deformation of the edge region of the running sleeve 12 is chosen such that a radial clearance of the running sleeve 12 in the recess 11 is guaranteed.

[0055] FIG. 5B shows an enlarged sectional representation of the embodiment of the recess 11 with a ring groove 16 represented in FIG. 5A into which deformed material of the running sleeve 12 protrudes in order to axially lock the running sleeve 12 in the recess 11.

[0056] FIGS. 6A to 6B show an enlarged schematic representation of a fourth embodiment of a recess 11 of the back of the rotating spiral element 2 of the spiral compressor according to the invention, wherein FIG. 6B shows a detailed representation of FIG. 6A.

[0057] FIG. 6A shows a recess 11 with a running sleeve 12 inserted into the recess 11 and which is axially locked with a press ring 17 inserted into the recess 11. The press ring 17 is inserted into the recess 11 as a press-fit and thus blocks an axial protrusion of the running sleeve 12 out of the recess 11. The inner diameter of the press ring 17 is larger than the inner diameter of the running sleeve 12, such that a touch of the inner surface of the press ring 17 with the outer surface of the guiding pins 4 received into the running sleeves 12 is avoided during operation.

[0058] FIG. 6B shows an enlarged sectional representation of the embodiment of the recess 11 represented in FIG. 6A with a press ring 17 for axially locking the running sleeve 12 inserted into the recess 11. The press ring 17 is inserted into the recess 11 such that it is arranged slightly below the surface of the back of the rotating spiral element 2 in order to prevent an end face friction with axially adjacent components, in particular with the disc-shaped sealing element 6. The recesses 11 have a cross-section on the back of the rotating spiral element which is enlarged in regions, with a landing 18 which serves as a press ring seat for the respective inserted press ring 17.

LIST OF REFERENCE NUMERALS

[0059] 1 stationary spiral element [0060] 2 rotating spiral element [0061] 3 rotating spiral wall [0062] 4 guiding pin [0063] openings [0064] 6 disc-shaped sealing element [0065] 7 housing body [0066] 8 notch [0067] 9 O-ring [0068] 10 pin [0069] 11 recess [0070] 12 running sleeve [0071] 13 sealing [0072] 14 O-ring [0073] 15 material deformation [0074] 16 annular groove/undercut [0075] 17 press ring/ring element [0076] 18 landing/press ring seal