Slip ring sealing device
By designing annular ribs and annular grooves on the back of the retaining member of the sliding ring seal device, flexible support is provided, and the leakage problem of the sliding ring seal device during rotation and stationary is solved, achieving better sealing performance and leakage stability.
Patent Information
- Application Number
- CN202380056413.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-08-09
- Filing Date
- 2023-06-01
- Publication Date
- 2025-03-18
AI Technical Summary
Existing slip ring sealing devices are difficult to achieve the effect of no leakage or minimal leakage when rotating and stationary, especially when temperature changes and pressure changes.
A slip ring sealing device is designed, wherein the retaining member consists of an annular rib, a first annular groove and a second annular groove, which protrudes on the back side of the retaining member to provide flexible support and reduce leakage.
Through this design, the slip ring sealing device significantly improves sealing performance in all operating types, reduces leakage and improves leakage stability, especially when temperature and pressure changes.
Smart Images
Figure CN119654508A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a slide ring seal device having improved supporting and sealing functions at the back side of the slide ring and reducing the disturbing force transmitted to the slide ring, which reduces leakage at the sealing gap of the slide ring seal. Background Art
[0002] Slide ring seals are known from the prior art in various designs. In applications, especially with toxic media, it must be ensured that the slide ring seal is as leak-free as possible both during operation, i.e. when the slide ring is rotating, and when the machine to be sealed is at a standstill. This, of course, also applies to other applications. Summary of the invention
[0003] The object of the present invention is to provide a mechanical slide seal which has a reliable sealing separation and minimal or no leakage in all operating modes while being producible in a manner that is as simple and cost-effective as possible.
[0004] This object is achieved by a sliding ring seal device having the features of the following technical solutions. The following technical solutions show preferred improved solutions of the present invention.
[0005] The slide ring seal device according to the present invention having the following technical solution features has the advantage that a significant improvement in leakage of the slide ring seal and an improved leakage stability are achieved. This is particularly advantageous because the improvement is achieved by surprisingly simple adaptation of a retaining member, which is arranged at the back side of one of the slide rings, wherein a significant leakage reduction and an improvement in leakage stability can be achieved. According to the present invention, this is achieved in the following manner, that is, the slide ring seal device comprises a slide ring seal having a rotating slide ring and a stationary slide ring, wherein the slide ring defines a sealing gap between its sliding surfaces. In addition, the slide ring seal device comprises a retaining member, which is arranged at the back side of one of the slide rings. The retaining member has a base surface pointing to the back side of the slide ring. The retaining member is, for example, a slide ring carrier that retains the slide ring. The base surface of the retaining member comprises an annular rib (Steg) protruding from the base surface in the axial direction of the slide ring seal and a first annular groove and a second annular groove formed in the base surface. The two annular grooves and the annular rib are arranged concentrically relative to each other. The annular rib here protrudes beyond the base surface of the retaining component by a predetermined protrusion s. The amount by which the annular rib protrudes beyond the base surface perpendicular to the center line of the slide ring seal is relatively small here and is in particular less than 1 mm. In the installed state, the annular rib is in contact with the back side of the slide ring to provide support at the back side of the slide ring. The annular rib is arranged between the first annular groove and the second annular groove. The first annular groove and the second annular groove are arranged in a manner adjacent to the annular rib.
[0006] Therefore, by the ingenious design of the slide ring seal according to the invention, a significantly improved sealing performance can be achieved by the slide ring seal. The annular rib can achieve flexibility (Flexibilisierung) of the contact between the retaining component and the back side of the slide ring. In particular, it is possible to compensate for the interference forces that may occur during the operation of the slide ring due to temperature changes, especially temperature changes to high temperatures, and speed changes and pressure changes, without having a negative impact on the flatness of the sliding surface of the slide ring. The present invention can be particularly advantageously applied to slide ring seals in which the slide ring and the retaining component are made of different materials. Here, the annular rib can be adapted to the material and / or to the expected maximum and minimum temperatures and the corresponding expected temperature gradients due to its flexibility, which is easy to achieve through the geometric design of the annular ribs according to the present invention.
[0007] The retaining component with the two annular grooves and the annular rib can be provided on the rotating slip ring and / or on the stationary slip ring.
[0008] In this case, mechanical weakening of the retaining component is prevented by the choice of the geometry of the annular rib and of the two annular grooves.
[0009] More preferably, the depth a' of the first annular groove is the same as the depth a of the second annular groove, or the depth a' of the first annular groove is smaller than the depth a of the second annular groove. In the case of the same depth, it can be ensured that geometrically identical conditions are provided on both sides of the annular rib. This also simplifies the manufacturability of the annular groove and the annular rib and is very cost-effective.
[0010] Further preferably, the width t' of the first annular groove extending in the radial direction is the same as or different from the width t of the second annular groove extending in the radial direction. In particular, the groove widths of the first annular groove and the second annular groove are different. This has the advantage that the annular groove can assume other functions in addition to defining the annular rib. Particularly preferably, an auxiliary sealing element, in particular an O-ring or the like, is arranged in one of the annular grooves. Therefore, the groove width of one of the two annular grooves is selected to be relatively large. The other groove width can be selected to be relatively small here, because the other groove width is introduced into the base surface of the retaining component only for the subsequent manufacture of the annular rib.
[0011] The retaining member is particularly preferably a slip ring carrier overlapping the slip ring. When the slip ring is a rotating slip ring, the torque is preferably also introduced into the slip ring via the retaining member.
[0012] It is further preferred that the retaining element has an annular region which extends radially within the slip ring. The annular region thus forms a kind of inner sleeve of the retaining element which, when the slip ring is a rotating slip ring, can be arranged directly on a shaft or sleeve, for example. A third annular groove is preferably arranged in this additional annular region, in which an additional auxiliary sealing element or a centering aid for the slip ring can be arranged.
[0013] Further preferably, the holding component with the annular rib is made of metal. The slide ring at which the holding component is arranged can also be made of a metallic material or alternatively of ceramic, in particular SiC or WC.
[0014] Preferably, the protrusion s of the annular rib beyond the base surface perpendicular to the center line of the slide ring seal is in the range of 0.1 mm ≤ s ≤ 0.5 mm. The protrusion is further preferably 0.2 mm.
[0015] Preferably, the free rib length l of the annular rib from the annular groove with a smaller depth is in the range of 0.5 mm≤l≤6 mm. The rib length l is further preferably 1 mm≤l≤2 mm and is formed by the depth a' and the projection s of the first annular groove.
[0016] More preferably, the depths a', a of the annular groove from the base surface of the holding component are in the range of 0.2 mm ≤ a' ≤ 6.5 mm and 0.2 mm ≤ a ≤ 6.5 mm. The depth a' is particularly preferably 2 mm.
[0017] Further preferably, the radial width t, t' of the annular groove is in the range of 0.1 mm to 7 mm. When auxiliary sealing elements etc. need not be arranged in the annular groove, the width of the annular groove should be kept as small as possible, preferably in the range of 0.1 mm to 2 mm.
[0018] According to another preferred design of the present invention, the thickness h of the annular rib is in the range of 0.2 mm ≤ h ≤ 1 mm. The thickness h is particularly preferably 0.4 mm.
[0019] Preferably, the ratio of the depth a' of the first annular groove (8) and the depth a of the second annular groove (9) to the thickness h of the annular rib 10 is within the range of 0.2≤a' / h≤15 and 0.2≤a / h≤15.
[0020] Further preferably, the ratio of the maximum free rib length l of the annular rib to the thickness h of the annular rib is in the range of 0.5≤l / h≤15. This ensures that the annular rib has sufficient flexibility on the one hand and sufficient mechanical rigidity on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the accompanying drawings:
[0022] Figure 1 shows a schematic cross-sectional view of a slide ring seal device according to a first embodiment of the present invention,
[0023] Figure 2 Shows Figure 1 A schematic cross-sectional view of a retaining member of a slide ring seal device,
[0024] Figure 3 Shows Figure 1 A schematic cross-sectional view of another retaining component of a mechanical slide ring seal,
[0025] Figure 4 Shows Figure 2 A schematic, enlarged partial cross-sectional view of a retaining member, and
[0026] Figure 5 A schematic partial sectional view shows an alternative embodiment of a retaining component for a mechanical slide ring seal. DETAILED DESCRIPTION
[0027] The following will refer to Figures 1 to 4 A slide ring seal device 1 according to a preferred embodiment of the present invention is described in detail.
[0028] like Figure 1 As shown, the slide ring seal device 1 comprises a slide ring seal 2 having a rotating slide ring 3 and a stationary slide ring 4. A sealing gap 5 is defined between a sliding surface 3a of the rotating slide ring 3 and a sliding surface 4a of the stationary slide ring 4.
[0029] The slide ring seal 2 seals the product space 12 at the shaft 14 against the atmosphere 13. XX denotes the center line of the slide ring seal arrangement.
[0030] The rotating slip ring 3 is arranged at the first holding member 6. The first holding member 6 enables torque transmission from the shaft 14 to the rotating slip ring 3. Figure 2 The first retaining member 6 is shown in detail in FIG.
[0031] The stationary slide ring 4 is arranged on the housing 15 . In this case, the stationary slide ring 4 is preloaded in the axial direction of the slide ring seal by means of a preload element 17 . The pin 16 serves as a torque introduction and ensures axial mobility relative to the housing 15 .
[0032] The second holding member 7 is arranged at the back side 4b of the stationary slip ring 4 and is Figure 3 You can see it in detail.
[0033] The first holding member 6 holding the rotating slip ring 3 has in particular an annular region 62, a radial region 61 and an overlapping region 63. The side of the first holding member pointing toward the back side 3b of the rotating slip ring 3 forms a base surface 60 of the first holding member 6. The base surface 60 is arranged perpendicular to the center line XX (see Figure 2 ).
[0034] An annular rib 10 protruding in the axial direction of the slide ring seal, a first annular groove 8 and a second annular groove 9 are arranged on the base surface 60, which faces the back side 3b of the rotating slide ring. Figure 2 It can be seen in FIG. 1 that the annular rib 10 is arranged here between the first annular groove 8 and the second annular groove 9. The two annular grooves 8, 9 and the annular rib are arranged concentrically relative to one another.
[0035] If further from Figure 2 As can be seen from FIG. 1 , the annular rib 10 protrudes beyond the base surface 60 of the first retaining member 6 by a protrusion s in the axial direction XX. Figure 4 As can be seen from the details of FIG. 1 , the protrusion s is very small here and is preferably in the range of 0.1 mm to 0.5 mm.
[0036] Therefore, the first annular groove 8 and the second annular groove 9 are arranged in close proximity to the annular rib 10. The mechanical rigidity of the annular rib 10 is obtained according to the depth a' of the first annular groove 8 and the depth a of the second annular groove 9 and the thickness h of the annular rib 10. In this embodiment, the depth a' of the first annular groove 8 is less than the depth a of the second annular groove 9 (see Figure 4 ). The free rib length l of the rib 10 is thereby defined.
[0037] Furthermore, the width t' of the first annular groove 8 is also smaller than the width t of the second annular groove 9. Thus, the second annular groove 9 is provided for receiving the auxiliary sealing element 18. The first annular groove 8 is merely a recess for forming the annular rib 10 on the base surface 60 of the first retaining member 6. Therefore, the width t' of the first annular groove 8 is significantly smaller than the width t of the second annular groove 9.
[0038] Furthermore, a further annular groove 62a is formed in the annular region 62, in which a further auxiliary sealing element 19 is arranged. Alternatively, a centering element for the rotating slide ring 3 can also be arranged here (see Figure 2 ).
[0039] Thus, in the axial direction, a contact surface is obtained between the first retaining member 6 and the rotating slide ring 3 only at the end region 10a of the annular rib and the back side 3b of the rotating slide ring 3. This can reduce interference forces that may occur between the components of the slide ring seal due to relative movements, especially caused by pressure changes and / or speed changes and / or temperature changes. From the perspective of the final effect, this results in a significantly improved leakage stability of the slide ring seal in a surprisingly simple manner, especially in the case of temperature increases and decreases or in the case of changes in the temperature gradient. The robustness of the slide ring seal against interfering influences can therefore be significantly increased.
[0040] The first retaining member 6 is preferably made of metal. The rotating slip ring 3 can also be made of metal or, alternatively, of a ceramic material. The thickness h of the annular rib 10 is preferably at most as wide as the smallest width t', t of one of the annular grooves 8, 9, which is t' in this embodiment.
[0041] Here, the provision of the annular rib 10 on the base surface 60 of the first holding component 6 does not lead to a mechanical weakening of the first holding component 6, since the depth a' of the first annular groove 8 is smaller than the depth a of the second annular groove 9 (see Figure 4 ). Therefore, by providing the annular rib 10 , a significantly better leakage characteristic of the entire slide ring seal can be achieved due to the flexibility of the contact between the rotating slide ring 3 and the first retaining component 6 .
[0042] In the first embodiment, the same device is also constructed on the back side 4b of the stationary slip ring 4. Figure 3 Schematically shown in . Here, the second retaining member 7 is arranged at the back side 4b of the stationary slip ring 4. The second retaining member 7 has a first annular groove 8, a second annular groove 9 and an annular rib 10 arranged between the two annular grooves 8 and 9, just like the first retaining member 6. The base surface 70 of the second member 7 is arranged in the direction of the back side 4b of the stationary slip ring 4. The two annular grooves 8, 9 and the annular rib are concentrically constructed at the base surface 70. In this embodiment, the two annular grooves 8, 9 are only provided to limit the annular rib 10. That is to say, neither of the two annular grooves 8, 9 needs to be constructed relatively large in order to accommodate auxiliary sealing elements and the like.
[0043] Therefore, in the first embodiment, the concept according to the invention is formed both on the first holding component 6 for the rotating slide ring 3 and on the second holding component 7 for the stationary slide ring 4. Therefore, the back sides of the two slide rings 3, 4 are supported only on the end region 10a of the annular rib 10. In operation, this allows minimal leakage in all operating situations of the slide ring seal.
[0044] Figure 5An alternative design of the first annular groove 9 of the first retaining member 6 is shown. Similar to the second retaining member 7, the annular rib 10 is Figure 5 For example, the annular groove 8 and the annular groove 9 are formed by two recesses, which form the first annular groove 8 and the second annular groove 9. The first annular groove 8 and the second annular groove 9 are designed to have the same cross section, are arranged only with different radii, and define an annular rib 10 between them. The depth a' of the first annular groove 8 and the depth a of the second annular groove 9 are the same. The widths t', t of the annular grooves 8, 9 are also the same. As a result, the two annular grooves 8, 9 can be produced in a cost-effective manner using the same tool.
[0045] In addition to the above written description of the invention, reference is hereby made expressly to Figures 1 to 5 The graphical representation of the invention in is used for the disclosure that supplements it.
[0046] Description of Reference Numerals
[0047] 1 Slide ring seal device
[0048] 2 Slide ring seals
[0049] 3 Rotating slip ring
[0050] 3a Sliding surface
[0051] 3b Back
[0052] 4Stationary slip ring
[0053] 4a Sliding surface
[0054] 4b Back
[0055] 5 Sealing gap
[0056] 6First holding member
[0057] 7 Second holding member
[0058] 8First annular groove
[0059] 9 Second annular groove
[0060] 10 Circular ribs
[0061] 10a End region
[0062] 12 Product Space
[0063] 13 Atmosphere
[0064] 14 Axis
[0065] 15 Housing
[0066] 16 Pins
[0067] 17 Preload mechanism
[0068] 18 Auxiliary sealing element
[0069] 19 Auxiliary sealing element
[0070] 60 base
[0071] 61 Radial Area
[0072] 62 Ring Area
[0073] 62a Other annular grooves
[0074] 63 Overlapping Area
[0075] 70 base surface
[0076] XX midline
[0077] a, a' Depth of the annular groove from the base surface
[0078] h is the thickness of the annular rib in the radial direction
[0079] Free rib length
[0080] sThe protrusion of the annular rib beyond the base surface
[0081] t, t' Width of the annular groove along the radial direction
Claims
1. A sliding ring sealing device, comprising: A sliding ring seal (2) comprising a rotating sliding ring (3) and a stationary sliding ring (4), wherein a sealing gap (5) is defined between the sliding surfaces (3a, 4a) of the rotating sliding ring and the stationary sliding ring. a retaining member (6, 7) arranged at the back side (3b, 4b) of one of the slip rings (3, 4), wherein the retaining member (6, 7) has a base surface (60, 70) pointing toward the back side (3b, 4b) of the slip ring (3, 4), The base surface (60, 70) comprises a rib (10) protruding from the base surface in the axial direction of the sliding ring seal, a first annular groove (8) formed in the base surface, and a second annular groove (9) formed in the base surface. wherein the first annular groove (8), the second annular groove (9) and the annular rib (10) are arranged concentrically relative to each other, and the annular rib (10) protrudes beyond the base surface (60, 70) of the retaining member (6, 7) by a protrusion amount s, wherein the annular rib (10) contacts the back side (3b, 4b) of the slip ring (3, 4) to provide support at the back side of the slip ring, wherein the annular rib (10) is arranged between the first annular groove (8) and the second annular groove (9), and The first annular groove (8) and the second annular groove (9) are arranged in close proximity to the annular rib.
2. The sliding ring seal device according to claim 1, wherein a depth a' of the first annular groove (8) from the base surface (60, 70) of the retaining component is less than or equal to a depth a of the second annular groove (9) from the base surface (60, 70) of the retaining component.
3. The sliding ring seal device according to any one of the preceding claims, wherein a width t' of the first annular groove (8) extending in the radial direction of the sliding ring seal is less than or equal to a width t of the second annular groove (9) extending in the radial direction of the sliding ring seal.
4. The slide ring seal device according to any one of the preceding claims, further comprising an auxiliary sealing element (18) which is arranged in one of the annular grooves.
5. The slide ring seal device according to any one of the preceding claims, wherein the retaining member (6, 7) and the annular rib (10) are made of a metal material.
6. The slide ring seal according to any one of the preceding claims, wherein the protrusion amount s of the annular rib (10) is in the range of 0.1 mm ≤ s ≤ 0.5 mm; and / or The rib length l of the annular rib (10) from the first annular groove (8) is in the range of 0.5 mm ≤ l ≤ 6 mm.
7. The sliding ring seal device according to any one of the preceding claims, wherein a depth a' of the first annular groove (8) from the base surface (60, 70) and a depth a' of the second annular groove (9) from the base surface (60, 70) are in the range of 0.2 mm ≤ a' ≤ 6.5 mm and 0.2 mm ≤ a ≤ 6.5 mm.
8. The slide ring seal device according to any one of the preceding claims, wherein a thickness h of the rib (10) is in the range of 0.2 mm ≤ h ≤ 1 mm.
9. The sliding ring seal device according to any one of the preceding claims, wherein the ratio of the depth a' of the first annular groove (8) and the depth a of the second annular groove (9) to the thickness h of the annular rib (10) is in the range of 0.2≤a' / h≤15 and 0.2≤a / h≤15. 10 . The slide ring seal according to claim 1 , wherein a ratio of a free rib length l of the annular rib to a thickness h of the annular rib is in the range of 0.5≦l / h≦15.