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CN-121985987-A - Filter element

CN121985987ACN 121985987 ACN121985987 ACN 121985987ACN-121985987-A

Abstract

The invention relates to a filter element (10), in particular an air filter element, comprising a pleated filter media bellows (12) extending at least partially circumferentially around a longitudinal axis (14), wherein pleats (16) of the filter media bellows (12) extend substantially parallel to the longitudinal axis (14). The filter media bellows (12) includes an inner pleat fold (20) at an inner periphery (18) and an outer pleat fold (24) at an outer periphery (22). The at least one inner pleat fold (20) and the at least one outer pleat fold (24) each include a pleat lock deformation (26, 28) having an extension along the longitudinal axis (14) that is less than a total longitudinal extension (30) of the filter media bellows (12).

Inventors

  • L. Tokachilli
  • L.C. FRITZ
  • M. R. Suarez

Assignees

  • 曼·胡默尔有限公司

Dates

Publication Date
20260505
Application Date
20241009
Priority Date
20231009

Claims (17)

  1. 1. A filter element (10), in particular an air filter element, comprising: A pleated filter media bellows (12), the pleated filter media bellows (12) extending at least partially circumferentially about a longitudinal axis (14), Wherein the pleats (16) of the filter media bellows (12) extend substantially parallel to the longitudinal axis (14), And wherein the filter media bellows (12) comprises an inner pleat fold (20) at the inner periphery (18) and an outer pleat fold (24) at the outer periphery (22), And wherein the at least one inner pleat fold (20) and the at least one outer pleat fold (24) each comprise a pleat lock deformation (26, 28), the pleat lock deformations (26, 28) having an extension along the longitudinal axis (14) that is less than a total longitudinal extension (30) of the filter media bellows (12).
  2. 2. Filter element according to claim 1, wherein the inner and outer pleat locking deformations (26, 28) comprise a predetermined depth (32, 34), in particular in a radial direction (36), a predetermined length (38, 40), in particular in a longitudinal direction (14), and a predetermined width (42, 44), in particular in a circumferential direction (46).
  3. 3. The filter element of claim 2, wherein, The width (42) of the inner fold locking deformations (26) is greater than the width (44) of the outer fold locking deformations (28), and/or The depth (32) of the invagination locking deformations (26) is greater than the depth (34) of the invagination locking deformations (28).
  4. 4. A filter element according to claim 2 or 3, wherein the width (42) of the inner pleat lock deformation (26) is at least 20% greater, in particular at least 25% greater, in particular at least 30% greater than the width (44) of the outer pleat lock deformation (28).
  5. 5. The filter element according to any one of claims 2 to 4, wherein, The depth (32) of the inner fold locking deformations (26) is at least 30% greater, in particular at least 35% greater, in particular at least 40% greater than the depth (34) of the outer fold locking deformations (28).
  6. 6. A filter element according to any one of the preceding claims, comprising an additional invagination locking deformation (26) at every nth invagination fold (20), where n is a natural number.
  7. 7. The filter element according to any one of the preceding claims, comprising said invagination locking deformations (26) at each invagination fold (20).
  8. 8. The filter element of claim 6 or 7, wherein, The width (42) of the plurality of inner pleat lock deformations (26) is on average greater than the width (44) of the outer pleat lock deformations (28), and/or The depth (32) of the plurality of invagination locking deformations (26) is on average greater than the depth (34) of the invagination locking deformations (28).
  9. 9. The filter element according to any one of claims 6 to 8, wherein, The width (42) of the plurality of inner pleat lock deformations (26) is on average at least 20% greater, in particular at least 25% greater, in particular at least 30% greater than the width (44) of the outer pleat lock deformations (28).
  10. 10. The filter element according to any one of claims 6 to 9, wherein, The depth (32) of the plurality of invagination locking deformations (26) is on average at least 30% greater, in particular at least 35% greater, in particular at least 40% greater than the depth (34) of the invagination locking deformations (28).
  11. 11. The filter element according to any one of claims 7 to 10, wherein, The invagination locking deformations (26) abut each other at least in the intended use state of the filter element (10).
  12. 12. The filter element according to any one of claims 6 to 11, wherein, The invagination locking deformations (26) are arranged at the same longitudinal position so as to lie in a common plane, in particular extending in a direction perpendicular to the longitudinal axis (14).
  13. 13. A filter element according to any one of the preceding claims, wherein a plurality of invagination locking deformations (26) are provided at a common invagination fold (20), and the plurality of invagination locking deformations (26) are spaced apart from each other in the longitudinal direction (14).
  14. 14. The filter element according to any of the preceding claims, wherein, The inner and/or outer pleat locking deformations (26, 28) are formed as local geometric deviations of the inner and/or outer pleat folds (20, 24), i.e. local pleat cross sections deviate from pleat cross sections along a majority of the longitudinal extension of the pleat.
  15. 15. The filter element according to any one of claims 2 to 14, wherein, The filter media bellows (12) comprises an outer pleat spacing (50) and an inner pleat spacing (48), the pleat spacing (48, 50) being a distance between two adjacent pleat folds (20, 24) measured in a circumferential direction (46), and Wherein the invagination locking deformations (26) comprise a minimum width of 70%, in particular 75%, in particular 80%, in particular 85% of the invagination distance (48) without the invagination locking deformations (26, 28).
  16. 16. Filter element according to any one of the preceding claims, comprising at least one end body (52, 53), in particular an end cap (54, 55), which closes the filter media bellows (12) in a fluid-tight manner at one axial end (56, 57).
  17. 17. The filter element according to any one of the preceding claims, comprising a fluid permeable support body (58), in particular a support grid, the support body (58) being arranged at an inner circumference (18) of the filter media bellows (12) and extending at least partially in a circumferential direction (46), wherein in particular the support body (58) is adapted and configured to support at least some of the invagination folds (20) against deformation in a radial direction (36).

Description

Filter element The present patent application claims priority from german patent application DE102023127453.8 filed by the german patent and trademark office on day 10, 2023, the subject matter of which is incorporated herein by reference. Technical Field The present invention relates to filter elements, in particular air filter elements. Background Cylindrical filter elements, in particular air filter elements, with pleated filter media bellows are known from the prior art. Pleat locking is applied to stabilization in the outer region of the filter element. Pleated rollers with pleat locking techniques known in the art are used to make such filter media bellows. Disclosure of Invention It is an object of the present invention to provide an improved filter element, in particular an air filter element, with pleat locking. According to an aspect of the invention, the object is achieved by a filter element, in particular an air filter element, comprising a pleated filter media bellows extending at least partially circumferentially around a longitudinal axis, wherein pleats of the filter media bellows extend substantially parallel to the longitudinal axis, and wherein the filter media bellows comprises inner pleat folds at an inner periphery and outer pleat folds at an outer periphery, and wherein at least one inner pleat fold and at least one outer pleat fold each comprise a pleat lock deformation having an extension length (extension) along the longitudinal axis, the extension length being smaller than the total longitudinal extension length of the filter media bellows. Advantageous embodiments are described in the dependent claims, the description and the figures. A filter element, in particular an air filter element, is proposed, comprising a pleated filter media bellows extending at least partially circumferentially around a longitudinal axis, wherein pleats of the filter media bellows extend substantially parallel to the longitudinal axis. The filter media bellows includes an inner pleat fold at an inner periphery and an outer pleat fold at an outer periphery. The at least one inner pleat fold and the at least one outer pleat fold each include a pleat lock deformation having an extension along the longitudinal axis that is less than the total longitudinal extension of the filter media bellows. Advantageously, by modifying the pleat rollers accordingly, these pleat rollers also have the ability to create radial folds in specific areas of the bellows, which are directed towards the outer areas of the filter element, by means of mechanical crushing forces when the filter medium (e.g. paper) is crushed. In the proposed filter element, in particular a cylindrical air filter element, there is a visual change in the bottom geometry of the pleats of the filter medium. This is accomplished by providing a reverse pleat lock that is associated with its implementation in a bent head of a particular filter media (e.g., paper) that has a characteristic known as pleat lock. This provides the ability to create radial bands (frieze) along the filter media bellows. The pleat lock deformities are advantageously present on the inner pleat folds and on the outer pleat folds. Thus, the internal stability of the pleat folds is enhanced, which makes the characteristic bands of the pleat lock deformations more pronounced on the interior portion of the filter media bellows. The pleat lock deformity has a visual appearance similar to a square, closing the central tube of the filter media bellows in a more uniform manner, and creating a greater likelihood of sedimentation of the filter dust at the bottom of the pleats. The reverse pleat lock allows for a larger band in the inner portion of the filter element, thereby changing the inner geometry of the pleats, as opposed to the prior art where such a more pronounced band is only present in the outer portion of the filter element. The pleating rollers are adapted to form radial pleats, by which the filter media bellows is better stabilized, with a more uniform distribution over the filter element. The better distribution of pleats provides a better visual appearance. It also allows the number of pleats to be reduced without losing the dust holding capacity of the filter element. The advantage of the proposed filter element is the internal stability of the pleats of the filter media bellows, which allows more dust to penetrate into the pleats and thus creates more sedimentation in this area than conventional pleats without this specific pleat lock. In such conventional pleats having a pleat lock at the outer side of the filter element, the subsidence is mainly at the portion of the pleat closer to the outer portion of the filter element, which may result in a depth of the clogged pleat and thus a reduced filter area. According to an advantageous embodiment of the filter element, the inner and outer pleat locking deformations may comprise a predetermined depth, in particular in the radi