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 a securing ring (10) which is designed to be secured to the stationary component (3), a first intermediate ring (11) and a first lateral ring (12) which are coaxially secured to the securing ring (10) in order to together form a first inwardly open U-shaped cross-section with a first annular intermediate space (4), a first sealing ring (20), which is provided within the first intermediate space (4) and a first sealing surface (23) of which is designed to sealingly rest against the rotating component (2), and a first seal support (30) which is situated radially between the first sealing ring (20) and the first intermediate ring (11) in the first intermediate space (4) in order to exert a radial force on the first sealing ring (20) and rotationally fix the first sealing ring (20).

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 between a rotating component and a stationary component.

[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, while being simple and cost-effective to manufacture, can reliably seal a rotating component against a stationary component and accommodate radial and axial movements of the rotating component. Furthermore, it would be desirable if the sealing system could be flexibly adapted to the sealing requirements.

[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 a retaining ring configured to be attached to the stationary component. Furthermore, the sealing system comprises a first intermediate ring and a first side ring, which are coaxially attached to the retaining ring to together form a first inwardly open U-shaped cross-section with a first annular space. The first intermediate ring is preferably arranged axially between the retaining ring and the first side ring. The sealing system also comprises a first sealing ring, which is arranged within the first space and configured to radially seal the rotating component at a first sealing surface.A portion of the sealing ring, on which the sealing surface is located, is positioned outside the annular space. Furthermore, the sealing system comprises a first sealing carrier, which is arranged radially between the first sealing ring and the first intermediate ring within the first space to exert a radial force on the first sealing ring and to fix it in a rotationally fixed position. Thus, a sealing system can be provided with a simple design in which the first sealing ring is arranged to be radially movable within the first space in order to accommodate radial movements of the rotating component. The radial movement of the first sealing ring is preferably in the range of 1 cm. The radial contact of the rotating component by means of the first sealing surface of the first sealing ring can accommodate axial movements of the rotating component. The sealing system is specifically designed to seal a process side from an atmospheric side.The sealing system can reliably seal the rotating component against the stationary component, even when stationary. The one-piece design with only a first sealing ring provides a particularly effective dust seal. The U-shaped cross-section, formed by the retaining ring, the first intermediate ring, and the first side ring, can be manufactured simply and cost-effectively, and facilitates easy maintenance, for example, when replacing the first sealing ring. The sealing system is preferably rotationally symmetrical.

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

[0008] Preferably, the retaining ring, the first intermediate ring, and the first side ring are coaxially fastened to one another by means of fasteners. The fasteners are specifically designed to form a screw connection. This allows for a simple and cost-effective, non-destructively detachable connection of the retaining ring, the first intermediate ring, and the side ring, enabling the first sealing ring to be reliably accommodated within the resulting U-shaped cross-section.

[0009] The sealing system is preferably segmented around its circumference. This allows the sealing system to be manufactured cost-effectively for large diameters to be sealed. Furthermore, the circumferentially segmented sealing system facilitates its assembly.

[0010] The segments of the sealing system are preferably interlocking, particularly using puzzle-piece connections. This allows for easy assembly and disassembly of the sealing system. Furthermore, interlocking connections for the sealing system can be easily produced, for example, using a laser cutting process. Preferably, the first sealing ring of a packing seal, particularly a gland packing, especially with a rectangular cross-section, is 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 seals can preferably be made of continuous aramid fiber or expanded graphite.Preferably, the packing seal is impregnated with a lubricant additive, such as PTFE, to improve the sealing and sliding properties of the first sealing ring. Preferably, the first sealing ring has a width between 10 and 30 millimeters. The first sealing ring is preferably designed for temperatures of up to 400°C. This can be reliably achieved by means of packing seals.

[0011] The first sealing carrier preferably has a radially oriented pin which is arranged in a corresponding recess in the first intermediate ring to guide the first sealing carrier radially. This allows torques from the first sealing ring to be absorbed by the first sealing carrier simply and reliably. Furthermore, the radial guidance provided by the pin and the recess can help to accommodate radial movements of the rotating component.

[0012] Preferably, the first sealing carrier has a tooth designed to engage with the first sealing ring to fix it in a rotationally fixed position. In particular, the sealing carrier has a plurality of teeth. These teeth can be easily integrated into the sealing carrier and provide reliable rotational fixation of the first sealing ring without damaging it.

[0013] A spring is preferably arranged between the first intermediate ring and the first sealing carrier to exert a radial force on the first sealing ring. This enables reliable contact of the rotating component via the first sealing surface of the first sealing ring, which can lead to an improvement in the sealing properties.

[0014] The retaining ring, the first intermediate ring, and / or the first side ring are preferably plate-shaped. This allows the components to be manufactured cost-effectively from a single sheet using a laser or waterjet cutting process.

[0015] The first sealing ring preferably has an inner diameter of at least one meter. More preferably, the inner diameter is at least 4 meters, particularly at least 7 meters, and most preferably at least 12 meters. This allows for the reliable sealing of rotating components with large diameters and the compensation of their axial and radial movements.

[0016] Preferably, the sealing system comprises a second intermediate ring and a second side ring, which are arranged coaxially with the retaining ring, such that the first side ring and the second side ring, together with the second intermediate ring, form a second inwardly opening U-shaped cross-section with a second annular space. The second intermediate ring is preferably arranged axially between the first and second side rings. Furthermore, the sealing system preferably comprises a second sealing ring, which is arranged within the second space and is configured to radially seal the rotating component at a second sealing surface. The sealing system preferably also includes a second sealing carrier, which is arranged radially between the second sealing ring and the second intermediate ring in the second space to exert a radial force on the second sealing ring and to fix the second sealing ring in a rotationally fixed position.Preferably, all previously described features of the sealing system can be combined with the second intermediate ring, the second side ring, the second sealing ring, and the second sealing carrier. The first intermediate ring and the second intermediate ring are particularly preferably identical. Furthermore, the first sealing ring and the second sealing ring are also preferably identical. The first intermediate ring and the second intermediate ring can preferably also be identical. This allows the sealing system to be easily and cost-effectively extended by a second sealing ring, which can improve the sealing properties of the sealing system.

[0017] Particularly preferably, the first side ring has a barrier medium supply to introduce a barrier medium into a space between the first sealing ring and the second sealing ring. This further improves the sealing properties of the sealing system, enabling it to seal against gases. In particular, a barrier gas or a purge gas can be introduced into the space via the barrier medium supply.

[0018] 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.

[0019] Further details, advantages and features of the present invention will become apparent from the following description of exemplary embodiments with reference to the drawing. It shows:

[0020] Fig. 1 is a perspective view of a sealing system according to a first embodiment, Fig. 2 is a view of the sealing system in the axial direction according to the first

[0021] Exemplary embodiment of the invention,

[0022] Fig. 3 shows a sectional view of the sealing system in the axial direction according to the first

[0023] Example of implementation,

[0024] Fig. 4 shows a sectional view of a sealing system according to a second embodiment of the invention and

[0025] Fig. 5 shows a perspective sectional view of the sealing system according to the second embodiment of the invention.

[0026] Below, with reference to Figures 1 to 5, a sealing system 1 according to a first and a second embodiment of the invention is described in detail.

[0027] Fig. 1 shows the sealing system, which consists of a retaining ring 10, a first intermediate ring 11, a first side ring 12, a first sealing ring 20 and a first sealing carrier 30.

[0028] The first intermediate ring 11 is arranged coaxially to the mounting ring 10 and adjacent to it. The first side ring 12 is arranged coaxially to the mounting ring 10 and to the first intermediate ring 11. The inner radius of the mounting ring 10 and the first side ring 12 are essentially identical. The inner radius of the first intermediate ring 11 is larger than the inner radius of the mounting ring 10 and the first side ring 12.

[0029] Thus, the fastening ring 10, the first intermediate ring 11, and the first side ring, in a section parallel to the axis of rotation, form an inwardly opening U-shaped cross-section. The fastening ring 10 and the first side ring 12 form the legs of the U-shaped cross-section. Due to the rotationally symmetric design of the fastening ring 10, the first intermediate ring 11, and the first side ring 12, the U-shaped cross-section forms a first annular space 4.

[0030] The first sealing ring 20 is arranged within the first gap 4. Furthermore, the first sealing carrier 30 is arranged radially between the first sealing ring 20 and the first intermediate ring 11 within the first annular gap 4. The first sealing ring 20 is configured to radially seal a rotating component 2 (shown in Fig. 3) against a first sealing surface 23. For this purpose, the first sealing carrier 30 exerts a radial force on the first sealing ring 20, pressing it onto the rotating component 2.

[0031] The first sealing ring 20 and the first sealing carrier 30 are arranged to float radially within the U-shaped cross-section formed by the retaining ring 10, the first intermediate ring 11, and the first side ring 12. This allows the first sealing ring 20 to compensate for radial movements of the rotating component 2 relative to the stationary component 3.

[0032] The inner radius of the first sealing ring 20, which is measured at the first sealing surface 23, is smaller than the inner radius of the first side ring 11 and the retaining ring 10. This prevents contact between the first side ring 12 and the retaining ring 10 with the rotating component 2.

[0033] The retaining ring 10, the first intermediate ring 11, and the first side ring 12 are coaxially fastened to one another by means of fastening elements 16, which are designed as screw connections. The fastening elements 16 comprise a threaded rod and a nut.

[0034] The outer diameter of the retaining ring 10 is larger than the outer diameter of the first intermediate ring 11 and the first side ring 12. This forms a flange to which the sealing system 1 can be attached to a stationary component 3 (shown in Fig. 5). The sealing system 1 is preferably attached to the stationary component 3 by means of a screw connection.

[0035] Figure 1 shows two segments of the mounting ring 10, which are arranged flush against each other. The mounting ring 10 is segmented into several segments around its circumference.

[0036] The first sealing ring 20 is a packing seal designed as a gland packing with a rectangular cross-section. The packing seal consists of a braided fiber material, which is preferably impregnated to improve the sliding and sealing properties of the first sealing ring 20.

[0037] Fig. 2 shows a partial view of the sealing system 1 from Fig. 1 in the axial direction, looking towards the first side ring 12. The first side ring 12 has two segments which are positively connected to each other. The positive connection is achieved by a puzzle-like joint.

[0038] In the first embodiment, the retaining ring 10, the first intermediate ring, the first side ring 12, and the first sealing carrier 30 are plate-shaped. This allows the components to be manufactured simply and cost-effectively from a single plate, for example, by laser beam welding. The plate is, in particular, a metal plate. If the plate is thin, it can also be a sheet metal plate.

[0039] Fig. 3 shows a sectional view through the sealing system 1. The sectional view is perpendicular to the axis of rotation of the sealing system 1 between the first intermediate ring 11 and the first side ring 12. Several first sealing carriers 30 are arranged in the first annular space 4 of the sealing system 1. The first sealing carrier 30 has a radially oriented pin 32, which is arranged in a corresponding recess 33 on the first intermediate ring 11. This allows the first sealing carrier 30 to be guided radially within the sealing system 1.

[0040] Several springs 36 are arranged between the first intermediate ring 11 and the first sealing carrier 30. Each first sealing carrier 30 has two springs 36, which are arranged on both sides next to the pin 32. The springs 36 are arranged in recesses in the first sealing carrier 30 and the first intermediate ring 11. Thus, the springs 36 can exert a radial force from the first intermediate ring 11 onto the first sealing carrier 30, which in turn exerts this radial force on the first sealing ring 20, pressing it with its first sealing surface 23 onto the rotating component 2. Due to the radially floating arrangement of the first sealing ring 20 and the first sealing carrier 30, radial movements of the rotating component 2 relative to the stationary component 3 can be compensated.

[0041] Each of the first sealing carriers 30 of the sealing system 1 preferably has three teeth 34 which are arranged to be inserted into the first sealing ring 20 in order to fix the first sealing ring 20 in a rotationally fixed manner.

[0042] The first sealing carrier 30 preferably has at least one fixing opening 35. The fixing opening 35 allows the first sealing carrier 30 to be fixed in a pre-tensioned position during assembly, thus simplifying the installation of the first sealing ring 20.

[0043] Fig. 4 shows a sectional view of a second embodiment of the sealing system 1. The sectional view is parallel to an axis of rotation of the sealing system 1. The second embodiment is similar to the first embodiment, except that in the second embodiment the sealing system 1 is extended by a second intermediate ring 13, a second side ring 14, a second sealing carrier 31 and a second sealing ring 21.

[0044] The second side ring 14 is identical to the first side ring 12 from the first embodiment. The first side ring 12 in the second embodiment has a barrier medium supply 15 through which a barrier medium can be introduced into a space 22 between the first sealing ring 20 and the second sealing ring 2. The barrier medium can preferably be a gas or a fluid and is in particular an injectable fiber putty packing.

[0045] The first side ring 12, the second side ring 14, and the second intermediate ring 13 are arranged coaxially and form a second inwardly opening U-shaped cross-section, which creates a second annular space 5. The second sealing ring 21 is arranged in this second annular space 5 and is configured to radially seal the rotating component 2 against a second sealing surface 24. Furthermore, the second sealing carrier 31 is arranged radially between the second sealing ring and the second intermediate ring 13 in this second annular space 5. The second sealing carrier 31 can exert a radial force on the second sealing ring 21 and fix it in a rotationally fixed position.

[0046] The first sealing ring 20 and the second sealing ring 21 from the second embodiment are identical to the first sealing ring 20 from the first embodiment. The first sealing carrier 30 and the second sealing carrier 31 from the second embodiment are identical to the first sealing carrier 30 from the first embodiment. Furthermore, the second side ring 14 from the second embodiment is identical to the first side ring 12 from the first embodiment.

[0047] Thus, the sealing system 1 can be easily and cost-effectively extended by an additional seal using the second intermediate ring 13, the second side ring 14, the second sealing ring 21, and the second sealing carrier 31. This further improves the sealing performance of the sealing system 1; in particular, by introducing a barrier medium through the barrier medium supply 15 in the first side ring 12, a gas-tight sealing system 1 can be provided.

[0048] Fig. 5 shows a perspective sectional view of the sealing system 1 according to the second embodiment of the invention. The sealing system 1 is attached to the stationary component 3 and seals radially against the rotating component 2 by means of the first sealing ring 20 and the second sealing ring 21. The rotating component 2 is cylindrical and can move axially along the first sealing surface 23 and the second sealing surface 24 of the first sealing ring 20 and the second sealing ring 21.

[0049] The sealing system according to the invention, as shown in the two exemplary embodiments, is designed to seal very large diameters, in particular greater than 7 meters.

[0050] The rotating component 2 is preferably the drum of a rotary kiln or a ball mill and can have an outer diameter greater than 7 meters.

[0051] The sealing system 1 according to the invention can reliably seal rotating components 2 against stationary components 3 while being simple and cost-effective to manufacture and assemble. The sealing system 1 can be easily supplemented with additional sealing rings to improve its sealing properties. The radial sealing of the rotating component by the floating sealing rings 20, 21 allows for the accommodation of axial and radial movements of the rotating component 2 relative to the stationary component 3.

[0052] Reference symbol list

[0053] 1 Sealing system

[0054] 2 rotating component

[0055] 3 Stationary component

[0056] 4 First space

[0057] 5 Second space

[0058] 10 fastening rings

[0059] 11 First intermediate ring

[0060] 12 First side ring

[0061] 13 Second intermediate ring

[0062] 14 Second side ring

[0063] 15 Blocking medium supply

[0064] 16 Fasteners

[0065] 20 First sealing ring

[0066] 21 Second sealing ring

[0067] 22 space

[0068] 23 First sealing surface

[0069] 24 Second sealing surface

[0070] 30 First sealing carrier

[0071] 31 Second sealing carrier

[0072] 32 cones

[0073] 33 recess

[0074] 34 teeth

[0075] 35 Fixing opening

[0076] 36 springs

Claims

Claims 1. Sealing system for sealing between a rotating component (2) and a stationary component (3), comprising . a fastening ring (10) which is designed to be attached to the stationary component (3), . a first intermediate ring (11) and a first side ring (12) which are coaxially attached to the fastening ring (10) to together form a first inwardly open U-shaped cross-section with a first annular space (4), . a first sealing ring (20) which is arranged within the first gap (4) and is designed to radially seal the rotating component (2) against a first sealing surface (23), and . a first sealing carrier (30) which is arranged radially between the first sealing ring (20) and the first intermediate ring (11) in the first space (4) to exert a radial force on the first sealing ring (20) and to fix the first sealing ring (20) in a rotationally fixed manner.

2. Sealing system according to claim 1, wherein the retaining ring (10), the first intermediate ring (11) and the first side ring (12) are coaxially fastened to one another by means of fastening means (16).

3. Sealing system according to one of the preceding claims, wherein the sealing system (1) is segmented circumferentially.

4. Sealing system according to claim 3, wherein the segments of the sealing system (1) are form-fitting and connectable.

5. Sealing system according to one of the preceding claims, wherein the first sealing ring (20) is a packing seal made of a fibrous material, in particular a braided fibrous material.

6. Sealing system according to one of the preceding claims, wherein the first sealing carrier (30) has a radially oriented pin (32) which is arranged in an associated recess (33) in the first intermediate ring (11) to guide the first sealing carrier (30) radially.

7. Sealing system according to one of the preceding claims, wherein the first sealing carrier (30) has a tooth (34) which is arranged to be inserted into the first sealing ring (20) in order to fix the first sealing ring (20) in a rotationally fixed manner.

8. Sealing system according to one of the preceding claims, wherein a spring (36) is arranged between the first intermediate ring (11) and the first sealing carrier (30) to exert a radial force on the first sealing ring (20).

9. Sealing system according to one of the preceding claims, wherein the retaining ring (10), the first intermediate ring (11) and / or the first side ring (12) are plate-shaped.

10. Sealing system according to one of the preceding claims, wherein the first sealing ring (20) has an inner diameter of at least 1 m, in particular of at least 4 m, in particular at least 7 m, and further in particular at least 12 m.

11. Sealing system according to one of the preceding claims, comprising . a second intermediate ring (13) and a second side ring (14) which are arranged coaxially to the fastening ring (10), such that the first side ring (12) and the second side ring (14) together with the second intermediate ring (13) form a second inwardly open U-shaped cross-section with a second annular space (5), . a second sealing ring (21) which is arranged within the second gap (5) and is designed to radially seal the rotating component (2) against a second sealing surface (24), and . a second sealing carrier (31) which is radially between the second sealing ring (21) and the second intermediate ring (13) in the second space (5) to exert a radial force on the second sealing ring (21) and to fix the second sealing ring (21) in a rotationally fixed position.

12. Sealing system according to claim 11, wherein the first side ring (12) has a barrier medium supply (15) to introduce a barrier medium into an intermediate space (22) between the first sealing ring (20) and the second sealing ring (21).

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

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