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DE-102024113310-B4 - Sterile mechanical seal assembly

DE102024113310B4DE 102024113310 B4DE102024113310 B4DE 102024113310B4DE-102024113310-B4

Abstract

Sterile mechanical seal assembly comprising: - a mechanical seal (2) with a rotating sliding ring (3) having a first sliding surface and a stationary sliding ring (4) having a second sliding surface, wherein a sealing gap (5) is defined between the sliding surfaces, - a rotating sliding ring carrier (30) which is configured to transmit a torque from a rotating component (9) to the rotating sliding ring (3), and - a first secondary seal (6), - wherein the rotating sliding ring carrier (30) has a sleeve region (31), an axial region (32) and a radial region (33), wherein the radial region (33) connects the sleeve region (31) with the axial region (32), and - wherein the rotating sliding ring carrier (30) has a recess (34) for receiving the first secondary seal (6), which is formed on an outer side facing away from the rotating sliding ring in the radial area (33) of the rotating sliding ring carrier (30), - wherein the recess (34) has in section an arc-shaped area (34a), a first connecting area (34b) and a second connecting area (34c), wherein the first connecting area (34b) and the second connecting area (34c) are each straight and an acute first angle a is formed between the first connecting area (34b) and the second connecting area (34c).

Inventors

  • Linus Baur

Assignees

  • EAGLEBURGMANN GERMANY GMBH & CO. KG

Dates

Publication Date
20260513
Application Date
20240513

Claims (14)

  1. A sterile mechanical seal assembly comprising: - a mechanical seal (2) with a rotating sliding ring (3) having a first sliding surface and a stationary sliding ring (4) with a second sliding surface, wherein a sealing gap (5) is defined between the sliding surfaces, - a rotating sliding ring carrier (30) configured to transmit a torque from a rotating component (9) to the rotating sliding ring (3), and - a first secondary seal (6), - wherein the rotating sliding ring carrier (30) has a sleeve region (31), an axial region (32), and a radial region (33), wherein the radial region (33) connects the sleeve region (31) to the axial region (32), and - wherein the rotating sliding ring carrier (30) has a recess (34) for receiving the first secondary seal (6), which is formed on an outer surface facing away from the rotating sliding ring in the radial region (33) of the rotating sliding ring carrier (30). is, - wherein the recess (34) has in section an arc-shaped area (34a), a first connecting area (34b) and a second connecting area (34c), wherein the first connecting area (34b) and the second connecting area (34c) are each straight and an acute first angle a is formed between the first connecting area (34b) and the second connecting area (34c).
  2. Sterile mechanical seal arrangement according to Claim 1 , where the acute first angle a lies in a range of 35° ≤ a ≤ 45°.
  3. Sterile mechanical seal arrangement according to Claim 1 or 2 , wherein the first connection area (34b) is arranged at an acute second angle b to a perpendicular (Y), perpendicular to a central axis (XX) of the mechanical seal (2), wherein the second angle b lies in a range of 75° ≤ b ≤ 85°.
  4. Sterile mechanical seal arrangement according to Claim 2 or 3 , wherein the radial region (33) has a conical region (33a) which is arranged at an acute third angle c to the perpendicular (Y) to the central axis (XX).
  5. Sterile mechanical seal arrangement according to one of the preceding claims, further comprising a second secondary seal (7), wherein the rotating sliding ring (3) has a step (3a) on a radially outer circumferential region, such that the second secondary seal (7) is arranged on the step (3a) between the rotating sliding ring (3) and the axial region (32) of the rotating sliding ring carrier (30).
  6. Sterile mechanical seal arrangement according to Claim 5 , wherein the second secondary seal (7) has a first axial sealing area (71), a second axial sealing area (72), a first radial sealing area (73) and a second radial sealing area (74).
  7. Sterile mechanical seal arrangement according to Claim 5 or 6 , wherein an axial end (32a) of the axial region (32) of the rotating sliding ring carrier (30) and an axial side (3b) of the step (3a) in the rotating sliding ring (3) lie in a plane (E) which is perpendicular to the central axis (XX) of the sliding ring seal (2).
  8. Sterile mechanical seal arrangement according to one of the preceding claims, further comprising a retaining ring (14) which is arranged in a groove (31c) in the sleeve area (31) of the rotating mechanical seal carrier (30) and is arranged on a side of the rotating mechanical seal (3) facing the sealing gap (5) and secures an axial position of the rotating mechanical seal (3).
  9. Sterile mechanical seal arrangement according to Claim 8 , wherein the rotating sliding ring (3) has a recess (3c) on a side facing the sealing gap (5) radially within the sealing gap (5) for receiving the retaining ring (14) and/or wherein the stationary sliding ring (4) has a recess (4c) on a side facing the sealing gap radially within the sealing gap (5) for receiving the retaining ring (14).
  10. Sterile mechanical seal arrangement according to one of the preceding claims, wherein the stationary sliding ring (4) has a step (4a) on a radial outer circumference, wherein the step (4a) forms a sharp edge (15) to the outer circumference.
  11. Sterile mechanical seal arrangement according to Claim 10 , wherein a free space (17) is formed at the step (4a) of the stationary sliding ring (4) in order to form a flushing flow (18) on the outer circumference of the stationary sliding ring (4).
  12. Sterile mechanical seal arrangement according to one of the preceding claims, wherein the rotating sliding ring (3) has a first axial length (L1) which is smaller than a second axial length (L2) of the stationary sliding ring (4).
  13. Sterile mechanical seal arrangement according to one of the preceding claims, wherein a rear surface (3d) of the rotating sliding ring (3) The annular gap (16) is formed for the rotating sliding ring carrier (30).
  14. Sterile mechanical seal arrangement according to one of the preceding claims, wherein the radial area (33) on the outside, which is in contact with the product to be sealed, is formed without edges from the sleeve area (31) to the axial area (32) and/or wherein the axial area (32) on the outside is formed without edges up to the axial end (32a).

Description

The present invention relates to a sterile mechanical seal arrangement with a significantly reduced tendency for contamination and/or adhesion and improved cleanability. Mechanical seal assemblies are used, among other things, in sterile applications, for example in the food, chemical, and cosmetics industries. Particular attention is paid to good cleanability and the prevention of product accumulation, which can lead to contamination of the product being sealed and/or the growth of bacteria or similar substances. Therefore, special designs for sterile applications are necessary. DE 10 2014 214 929 A1 Disclosing a tandem shaft seal, which is flushable and arranged on the spring element for preloading the mechanical seals in stationary components. Furthermore, the DE 10 2014 221 043 B3 a drilling fluid system with an interchangeable insert. It is therefore an object of the present invention to provide a sterile mechanical seal assembly which, with a simple design and simple, cost-effective manufacturing capability, enables easy cleaning and can prevent product residues from adhering to components of the sterile mechanical seal assembly. This problem is solved by a sterile mechanical seal arrangement with the features of claim 1. The dependent claims describe preferred embodiments of the invention. In contrast, the sterile mechanical seal assembly according to the invention, with the features of claim 1, has the advantage that self-cleaning, particularly of the components of the sterile mechanical seal assembly that are in contact with the medium to be sealed, is possible during operation. Furthermore, the sterile mechanical seal assembly according to the invention prevents the formation of deposits and adhesions on the components that are in contact with the medium to be sealed. In addition, the sterile mechanical seal assembly can be easily cleaned. According to the invention, this is achieved by the sterile mechanical seal assembly comprising a mechanical seal with a rotating sliding ring having a first sliding surface and a stationary sliding ring with a second sliding surface. A sealing gap is defined between the first and second sliding surfaces. The sterile mechanical seal assembly further comprises a rotating sliding ring carrier, which is configured to transmit a torque from a rotating component to the rotating sliding ring. The rotating sliding ring carrier has a sleeve section, an axial section, and a radial section. The radial section connects the sleeve section to the axial section. The sleeve section extends, in particular, within the rotating sliding ring, resulting in a C-shape in cross-section. This allows the rotating sliding ring to be at least partially positioned between the sleeve section and the axial section. The sterile mechanical seal assembly further comprises a first secondary seal, in particular an O-ring. The rotating sliding ring carrier has a recess on its outer surface for receiving the first secondary seal. Thus, the first secondary seal comes into contact with the medium to be sealed. The recess is located on an outer surface facing away from the rotating sliding ring, in the radial area of the rotating sliding ring carrier. The first secondary seal seals, in particular, against a rotating conveying component, e.g., a pump impeller or the like. The recess is configured in cross-section with an arc-shaped area, a first connection area, and a second connection area. The first and second connection areas are each straight and form an acute angle α between them. This design ensures that the first secondary seal is securely held in the recess on the outer side in the radial area of the rotating sliding ring carrier. The straight first and second connection areas result in very wide sealing surfaces between the first secondary seal and the rotating sliding ring carrier, which particularly reinforces the fixation of the first secondary seal within the recess. This reduces the risk of the first secondary seal being forced out of the recess. The first angle a is preferably formed in a range of 35° ≤ a ≤ 45° and is particularly preferably 40°. Preferably, the first connection area is arranged at an acute second angle b to a perpendicular Y to a central axis X-X of the mechanical seal. The second angle b preferably lies in a range of 75° ≤ b ≤ 85° and is particularly 78°. Thus, the first connection area to the central axis X-X has only a relatively small slope, further reducing the tendency for the first secondary seal to move outwards in the radial direction. Preferably, the radial area of the rotating sliding ring carrier has a conical shape. The conical area is arranged at an acute third angle c to the perpendicular Y to the central axis XX. The third angle c preferably lies in a range of 30° ≤ c ≤ 40° and is particularly 35°. More preferably, the sterile mechanical seal assembly further comprises a second secondary seal, wherein the second secondary seal is arranged on a step forme