Sealing system for providing a seal between a rotating component and a stationary component

Abstract

The invention relates to a sealing system for providing a seal between a rotating component (2) and a stationary component (3), comprising an annular seal housing (10) with a radially inwardly open U-shaped cross-section and a seal support (20) on which a first sealing ring (21), a second sealing ring (22), a third sealing ring (23), and a fourth sealing ring (24) are provided. The seal support (20) is mounted to as to be radially movable in the U-shaped cross-section of the seal housing (10), a blocking chamber (4) is formed radially between the seal housing (10) and the seal support (20), the seal housing (10) is designed to be secured to the stationary component (3), a first contact surface (21a) of the first sealing ring (21) is designed to sealingly rest against a first sealing surface (11) of the seal housing (10) in the axial direction, a second contact surface (22a) of the second sealing ring (22) is designed to sealingly rest against a second sealing surface (12) of the seal housing (10) in the axial direction, and a third contact surface (23a) of the third sealing ring (23) and a fourth contact surface (24a) of the fourth sealing ring (24) are designed to sealingly rest against the rotating component (2) in the radial direction.

Description

[0001] Sealing system for sealing between a rotating component and a stationary component

[0002] Description

[0003] The invention relates to a sealing system for sealing a process side against an atmospheric side and a ball mill with the sealing system which seals a ring motor against a grinding chamber of a drum in the ball mill.

[0004] Large rotating drums, such as those found in ball mills or rotary kilns, can move axially and radially during operation. These movements should be accommodated by a sealing system mounted on the drum to reliably seal the process side from the atmospheric side. In the prior art, compensators are most commonly used as axial compensating elements. These are limited in terms of operating temperature, especially with moist, condensing gases, and under axial movement, radial deflection, and thermal expansion. Simple lip seals are typically used for sealing, but these are insufficient to accommodate radial and axial movement and lack adequate wear resistance.

[0005] The object of the invention is to provide a sealing system for very large diameters which, with simple and cost-effective manufacturing, can reliably seal a rotating component against a stationary component and can accommodate radial and axial movements of the rotating component.

[0006] This problem is solved by the sealing system according to the invention with the features of claim 1. The sealing system for sealing between a rotating component and a stationary component comprises an annular sealing housing with a radially inwardly opening U-shaped cross-section and a sealing carrier in which a first sealing ring, a second sealing ring, a third sealing ring, and a fourth sealing ring are arranged. The sealing carrier is arranged to be radially movable within the U-shaped cross-section of the sealing housing, with a barrier chamber forming radially between the sealing housing and the sealing carrier. The sealing housing is designed to be attached to the stationary component.The first sealing ring can seal axially against a first sealing surface of the seal housing at a first contact surface, and the second sealing ring can seal axially against a second sealing surface of the seal housing at a second contact surface. The third and fourth sealing rings can seal radially against the rotating component at a third and fourth contact surface, respectively. The floating arrangement of the seal carrier within the seal housing allows for reliable accommodation of radial movements of the rotating component. The radial contact of the third and fourth sealing rings with the rotating component enables the absorption of axial displacements of the rotating component, particularly if the rotating component is cylindrical in the area of ​​the third and fourth sealing rings.The sealing system is specifically designed to seal a process side against an atmospheric side, even with very large diameters on the order of several meters. The sealing system can also reliably seal the rotating component against the stationary component when stationary. The sealing system preferably incorporates a torque-bearing mechanism, particularly with radial centering, to prevent rotational movement of the seal carrier.

[0007] The dependent claims describe preferred embodiments of the invention.

[0008] Preferably, the first, second, third, and / or fourth sealing ring is a packing seal, in particular a gland packing, especially with a rectangular cross-section, made of a fibrous material, particularly a braided fibrous material. Packing seals can exhibit good sealing properties with high abrasion resistance. Furthermore, packing seals can be flexibly adapted to large diameters to be sealed. The packing seal can preferably be made of continuous aramid fiber or expanded graphite. It is further preferred that the packing seal is impregnated with a lubricant additive, such as PTFE. Preferably, the first, second, third, and fourth sealing rings have the same cross-section. In particular, the width of the first, second, third, and fourth sealing rings is between 10 mm and 30 mm.The first, second, third and / or fourth sealing ring is preferably designed for temperatures up to 400°C. This can be reliably achieved using packing seals.

[0009] Preferably, the seal carrier has at least one first spring configured to press the first and / or second sealing ring against the first and / or second sealing surface. This ensures a uniform contact force on the third and / or fourth sealing ring, thereby improving the sealing properties. Preferably, the first spring is arranged in a through-hole between the first and second sealing rings in the seal carrier, enabling cost-effective manufacturing. More preferably, the sealing system has a plurality of first springs arranged circumferentially in the seal carrier.

[0010] The sealing carrier preferably has at least one second spring configured to press the third and / or fourth sealing ring against the rotating component. This can ensure a reliable radial seal of the rotating component. Furthermore, the second spring can compensate for changes in the diameter of the rotating component, which may be due, for example, to thermal expansion.

[0011] Preferably, the third and fourth sealing rings are axially spaced apart to form a gap on the rotating component. This gap is preferably filled with a barrier medium. This improves the sealing properties of the sealing system. The barrier medium can be a gas or a liquid. Preferably, the barrier medium is a fiber putty packing.

[0012] A gaseous barrier medium can preferably be introduced from the barrier chamber into the gap through an opening in the sealing carrier. This allows a barrier gas or purge gas to be easily introduced into the gap to improve the sealing properties of the sealing system.

[0013] Preferably, an intermediate ring is arranged in the space, which in particular includes sensors. The intermediate ring can facilitate simple spacing between the third and fourth sealing rings. Furthermore, the intermediate ring can enable easy replacement of the third and fourth sealing rings. The integration of sensors in the intermediate ring can allow monitoring of the sealing properties and wear in the sealing system.

[0014] The sealing housing preferably comprises a first plate-shaped side element and a second plate-shaped side element, which are aligned perpendicular to an axis of rotation of the sealing system and are connected by a connecting element. The three-part plate-shaped design of the sealing housing can enable simple and cost-effective manufacturing, especially for large diameters to be sealed.

[0015] Preferably, the first side element, the second side element, and the connecting element are joined together by means of a fastening element. This allows the sealing housing to be manufactured simply and cost-effectively. Furthermore, the detachable connection of the sealing housing components enables easy maintenance of the sealing system, for example, to replace sealing rings. The fastening element preferably forms a screw connection.

[0016] Preferably, the sealing housing has a barrier gas port to supply the barrier chamber with a barrier gas. The barrier gas port is particularly located in the connecting element. This allows gas to be easily introduced into the barrier chamber. The gas can preferably also contribute to cooling the sealing system.

[0017] Preferably, the sealing housing and / or the sealing carrier is segmented around its circumference. This allows for the simple and cost-effective production of a sealing system for sealing large diameters.

[0018] The third and fourth sealing rings preferably have an inner diameter of at least one meter. More preferably, the inner diameter is at least four meters, particularly at least seven meters, and most preferably at least twelve meters. This allows for the reliable sealing of large-diameter rotating components and the compensation of their axial and radial movements.

[0019] The first, second, third, and fourth sealing rings are preferably made of the same material. This allows for a reliable seal using the sealing system while maintaining cost-effective manufacturing.

[0020] Furthermore, the invention relates to a ball mill or a rotary kiln with a sealing system as previously described. The sealing system can absorb axial and radial movements of a rotating component in the ball mill or rotary kiln, preventing these movements from being transmitted to a stationary component of the ball mill or rotary kiln.

[0021] Brief description of the drawings

[0022] A preferred embodiment of the invention is described in detail below with reference to the accompanying drawings. It shows:

[0023] Fig. 1 shows a perspective view of a sealing system according to a preferred embodiment of the invention and

[0024] Fig. 2 shows another perspective view of the sealing system according to the preferred embodiment of the invention. A sealing system 1 for a ball mill is described in detail below with reference to Figures 1 and 2.

[0025] Fig. 1 shows the sealing system 1 for sealing a process side 5 inside a rotating component 2 against an atmospheric side 6, which is arranged radially outside the rotating component 2. The sealing system 1 has an annular sealing housing 10, which is attached to a stationary component 3.

[0026] The annular sealing housing 10 has, in a section parallel to the axis of rotation of the sealing housing 10, a radially inwardly opening i-shaped cross-section, which forms a receiving chamber 40. A sealing carrier 20 is arranged within the U-shaped cross-section.

[0027] A first sealing ring 21, a second sealing ring 22, a third sealing ring 23, and a fourth sealing ring 24 are arranged on the sealing carrier 20. The first sealing ring 21 seals against a first sealing surface 11 of the sealing housing 10 via a first contact surface 21a. The second sealing ring 22 seals against a second sealing surface 12 of the sealing housing 10 via a second contact surface 22a. Furthermore, the third sealing ring 23 and the fourth sealing ring 24 seal radially against the rotating component 2 with a third contact surface 23a and a fourth contact surface 24a, respectively. Thus, the sealing carrier 20 is floatingly mounted in the sealing housing 10, which allows radial movements of the rotating component 2 to be accommodated. The rotating component 2 is cylindrical at the contact surface with the sealing system 1, so that the rotating component 2 can move axially relative to the sealing system 1.

[0028] The first sealing ring 21, the second sealing ring 22, the third sealing ring 23, and the fourth sealing ring 24 are packing seals with a rectangular cross-section, made of a braided fiber material. This allows for the formation of a finished sealing gap, which enables reliable sealing properties. The rectangular cross-section of all sealing rings 21, 22, 23, 24 preferably has a width between 10 mm and 30 mm.

[0029] The first sealing ring 21 and the second sealing ring 22 are arranged in two opposing grooves 8 in the sealing carrier 20. A through-bore 9 is formed between the grooves 8, in which a first spring 25 is arranged. The first spring 25 contacts the first sealing ring 21 and the second sealing ring 22 via pressure rings 19 and presses them outwards against the first sealing surface 11 and the second sealing surface 12.

[0030] The third sealing ring 23 and the fourth sealing ring 24 are spaced apart from each other on an inner radius of the sealing carrier 20. The gap between the third sealing ring 23 and the fourth sealing ring 24 is formed by an intermediate ring 28, which is arranged coaxially between the third sealing ring 23 and the fourth sealing ring 24. A space 27 is thus formed between the third sealing ring 23, the intermediate ring 28, the fourth sealing ring 24, and the rotating component 2.

[0031] Preferably, a sensor is arranged in the intermediate ring 28 which can detect operating parameters of the sealing system 1, such as the wear of the third sealing ring 23 and the fourth sealing ring 24.

[0032] A barrier medium is preferably arranged in the space 27, which can improve the sealing properties of the sealing system 1. For example, an injectable fiber putty packing can be arranged as a barrier medium in the space 27.

[0033] A barrier chamber 4 is arranged radially between the sealing carrier 20 and the sealing housing 10. A barrier gas can be introduced into the barrier chamber 4 via a barrier gas opening 16 in the sealing housing 10. The barrier gas can also be introduced into the space 27 through openings 7 in the sealing carrier 20.

[0034] In the sealing carrier 20, a second spring 26 is arranged in each of two blind bores 18. These springs exert a spring force on the third sealing ring 23 and the fourth sealing ring 24, pressing them against the rotating component 2. A pressure ring can also be arranged between the second spring 26 and the third sealing ring 23 and the fourth sealing ring 24, respectively, to better transfer the spring force to the sealing ring.

[0035] The sealing system 1 preferably has a plurality of first springs 25 and second springs 26, which are arranged circumferentially in the sealing carrier 20 in order to exert a circumferentially uniform force on the sealing rings 21 , 22, 23, 24.

[0036] The sealing housing 10 comprises a first plate-shaped side element 13 and a second plate-shaped side element 14, which are aligned perpendicular to an axis of rotation of the sealing system 1. The first side element 13 and the second side element 14 are connected to each other at a radially outer end by means of a connecting element 15. Thus, the first side element 13 and the second side element 14 form the legs of the U-shaped cross-section of the sealing housing 10.

[0037] The first sealing surface 11 is located on an inner surface of the first side element 13, and the second sealing surface 12 is located on an inner surface of the second side element 14. A plurality of bores 17 are arranged circumferentially in the second side element 14, extending into the connecting element 15 and the first side element 13, in order to connect the first side element 13, the second side element 14, and the connecting element 15 by means of a fastening element, such as a screw. Fig. 2 shows another perspective view of the sealing system 1 from Fig. 1. In Fig. 2, the first side element 13 is hidden. This reveals the bores 17 in the connecting element 15.

[0038] Furthermore, Fig. 2 shows a clamping element 29 in greater detail, which adjoins the seal carrier 20 and the fourth sealing ring 24. The clamping element 29 can be attached to the seal carrier 20 by means of a fastening element and exerts an axial force on the fourth sealing ring 24, the intermediate rings 28 arranged thereon, and the third sealing ring 23, which is laterally attached to the seal carrier 20 at a shoulder 20a. This allows the third sealing ring 23 and the fourth sealing ring 24 to be axially fixed in the seal carrier 20 while still retaining radial mobility. The clamping element 29 can be easily removed from the seal carrier 20 by means of the fastening element, thereby allowing the third sealing ring 23 and the fourth sealing ring 24 to be replaced.

[0039] The inner diameter of the third sealing ring 23 and the fourth sealing ring 24 is preferably at least 7 meters and corresponds to the outer diameter of the rotating component 2 in the area of ​​the sealing system 1.

[0040] To facilitate manufacturing and assembly, the sealing housing 10 and the sealing carrier 20 are preferably segmented. Furthermore, the segments are preferably connectable to one another by means of positive-locking connections.

[0041] The sealing carrier 20 is preferably arranged in a rotationally fixed manner on the sealing housing 20. This can be implemented, for example, by means of a torque transmission and a radial centering.

[0042] Thus, a sealing system for very large diameters can be provided, which enables a seal between a rotating component and a stationary component, whereby the sealing system 1 can accommodate axial and radial movements of the rotating component 2.

[0043] Reference symbol list

[0044] 1 Sealing system

[0045] 2 Rotating component

[0046] 3 Stationary component

[0047] 4 Locking chamber

[0048] 5 Process page

[0049] 6 Atmosphere side

[0050] 7 Opening

[0051] 8 grooves

[0052] 9 through holes

[0053] 10 sealing housings

[0054] 11 First sealing surface

[0055] 12 Second sealing surface

[0056] 13 First page element

[0057] 14 Second page element

[0058] 15 Connecting element

[0059] 16. Gas shut-off valve

[0060] 17 bore

[0061] 18 Blind hole drilling

[0062] 19 pressure rings

[0063] 20 sealing carriers

[0064] 20a paragraph

[0065] 21 First sealing ring

[0066] 21a first contact surface

[0067] 22a second contact surface

[0068] 23a third contact surface

[0069] 24a fourth contact surface

[0070] 22 Second sealing ring

[0071] 23 Third sealing ring

[0072] 24 Fourth sealing ring

[0073] 25 First spring

[0074] 26 Second spring

[0075] 27 space

[0076] 28 Intermediate ring

[0077] 29 clamping element

[0078] 40 Recording Room

Claims

Claims 1. Sealing system for sealing between a rotating component (2) and a stationary component (3), comprising . an annular sealing housing (10) with a radially inwardly opening i-shaped cross-section and . a sealing carrier (20) on which a first sealing ring (21), a second sealing ring (22), a third sealing ring (23) and a fourth sealing ring (24) is arranged, . wherein the sealing carrier (20) is arranged radially movable in the U-shaped cross-section of the sealing housing (10), wherein a barrier chamber (4) is formed radially between the sealing housing (10) and the sealing carrier (20), . wherein the sealing housing (10) is designed to be attached to the stationary component (3), . wherein the first sealing ring (21) is arranged to seal axially with a first contact surface (21a) against a first sealing surface (11) of the sealing housing (10), . wherein the second sealing ring (22) is arranged to seal axially with a second contact surface (22a) against a second sealing surface (12) of the sealing housing (10) and . wherein the third sealing ring (23) and the fourth sealing ring (24) are arranged to seal radially against the rotating component (2) with a third contact surface (23a) and fourth contact surface (24a).

2. Sealing system according to claim 1, wherein the first sealing ring (21), second sealing ring (22), third sealing ring (23) and / or fourth sealing ring (24) is a packing seal, in particular with a rectangular cross-section made of a fibrous material, in particular a braided fibrous material.

3. Sealing system according to one of the preceding claims, wherein the sealing carrier (20) has at least one first spring (25) arranged to seal the first sealing ring (21) and / or the second sealing ring (22) against the first sealing surface (11) and / or second sealing surface (12).

4. Sealing system according to one of the preceding claims, wherein the sealing carrier (20) has at least a second spring (26) which is configured to press the third sealing ring (23) and / or the fourth sealing ring (24) against the rotating component (2).

5. Sealing system according to one of the preceding claims, wherein the third sealing ring (23) and the fourth sealing ring (24) are axially spaced apart to form a gap (27) on the rotating component (2), in particular filled with a barrier medium.

6. Sealing system according to claim 5, wherein a gaseous barrier medium can be introduced from the barrier chamber (4) into the space (27) through an opening (7) in the sealing carrier (20).

7. Sealing system according to claim 5 or 6, wherein an intermediate ring (28) is arranged in the space (27), which in particular has a sensor.

8. Sealing system according to one of the preceding claims, wherein the sealing housing (10) comprises a first plate-shaped side element (13) and a second plate-shaped side element (14) which are aligned perpendicular to an axis of rotation of the sealing system (1) and are connected by a connecting element (15).

9. Sealing system according to claim 8, wherein the first side element (13), the second side element (14) and the connecting element (15) are connected by means of a fastening element.

10. Sealing system according to one of the preceding claims, wherein the sealing housing (10) has a barrier gas opening (16), in particular in the connecting element (15), to supply the barrier chamber (4) with a barrier gas.

11. Sealing system according to one of the preceding claims, wherein the sealing housing (10) and / or the sealing carrier (20) is segmented circumferentially.

12. Sealing system according to one of the preceding claims, wherein the third sealing ring (23) and the fourth sealing ring (24) have an inner diameter of at least 1 m, in particular of at least 4 m, in particular of at least 7 m, and further in particular of at least 12 m.

13. Sealing system according to one of the preceding claims, wherein the first sealing ring (21), the second sealing ring (22), the third sealing ring (23) and the fourth sealing ring (24) are made of the same material.

14. Ball mill or rotary kiln with a sealing system according to one of claims 1 to 10.

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