Filter material for a fluid and drainage layer for such a filter material including a filter element

Patent metadata

Field	Value
Publication number	US-9943792-B2
Application number	US-201414758629-A
Country	US
Kind code	B2
Filing date	Jan 17, 2014
Priority date	Jan 19, 2013
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A filter material for a fluid, particularly a hydraulic fluid, has a multi-layer filter medium ( 10 ) through which a fluid can flow and having a filter layer ( 20 ) and a drainage layer ( 32 ) forming a three-dimensional structure designed to enlarge the flow channels formed for the fluid to flow through. The drainage layer cooperates with an adjacent drainage layer and/or has individual line elements ( 33 ) that form a mesh or grid structure. Those line elements are arc-shaped or curved at least to some extent.

First claim

The invention claimed is:

1. A filter material for fluids, the filter material comprising:
a multi-layer filter medium through which a fluid can flow and including a filter layer, a first flow path defining layer and a second flow path defining layer, said second flow path defining layer having a thickness with enlarged flow channels formed therein for fluid to flow therethrough relative to flow channels in said first flow path defining layer; and
two individual line elements of said second flow path defining layer extending adjacent to one another along arc-shaped paths at least to some extent and defining flow chambers between pairs of two consecutive cross points of said two individual line elements, each of said flow chambers having a largest opening width formed between two apexes of the arc-shaped paths that are spaced from one another, said two individual line elements rest against one another and on top of one another at the cross points, said two individual line elements forming angles therebetween changing gradually within each repeat of a repeating pattern of said two individual line elements.

2. A filter material according to claim 1 wherein
said second flow path defining layer is disposed on a downstream side of the filter material.

3. A filter material according to claim 1 wherein
said second flow path defining layer is flush with and adjacent to said first flow path defining layer.

4. A filter material for a fluid, the filter material comprising:
a multi-layer filter medium through which a fluid can flow and including a filter layer and a flow path defining layer, said flow path defining layer having a thickness with flow channels formed therein for the fluid to flow therethrough and being composed of individual line elements forming at least one of a mesh or grid, said individual line elements being at least one of arc-shaped or curved, at least to some extent, two of said individual line element extending adjacent to one another in an arc-shape, at least to some extent, and defining flow chambers between each pair of two consecutive cross points of said two of said individual line elements, each of said flow chambers having a largest opening width formed between two apexes of arc-shaped courses of said two of said individual line elements that are spaced apart from one another, said cross points of said two of said line individual elements resting against one another and on top of one another, said two of said line individual elements defining an included angle therebetween changing gradually within each repeat of a repeating pattern of said two individual line elements.

5. A filter material according to claim 4 wherein
each of said flow chambers has a shape approximately of at least one of a circle, ellipse or a rhombus between said two of said individual line elements.

6. A filter material according to claim 4 wherein
support layers sandwich said multi-layer medium therebetween, at least one of said support layers comprise at least one of line-shaped grid elements or mesh elements bordering individual outlets for the fluid at edges of said support layers and forming a flow path defining layer.

7. A filter material according to claim 6 wherein
said outlets of said support layers are in shapes of at least one of rectangles or rhombuses.

8. A filter material according to claim 4 wherein
said flow chambers are channel-shaped guides bordered, at least to some extent, at edges thereof by said individual line elements extending in arc-shapes.

9. A filter material according to claim 6 wherein
said flow chambers of said flow path defining layer have flow cross sections dimensioned at least equal to flow openings of said support layers.

10. A filter material according to claim 9 wherein
said flow cross sections are larger than said flow openings of said support layers.

11. A filter material according to claim 9 wherein
said flow cross sections are twice as large as said flow openings of said support layers.

12. A filter material according to claim 4 wherein
said individual line elements of said flow path defining layer comprise at least one of filaments, threads, yarns or fibers made of at least one of plastic or metal material, are connected to one another as a mesh and are part of at least one of a screen, braided fabric, knitted fabric, or grid.

13. A filter material according to claim 6 wherein
said flow path defining layer is supported directly at one of said support layers; and
said individual line elements are in direct contact with one another at least to some extent.

14. A filter material according to claim 6 wherein
said flow path defining layer is arranged between two other layers.

15. A filter material according to claim 4 wherein
said flow path defining layer is disposed as an outer layer or on an upstream side of said multi-layer medium.

16. A filter material according to claim 6 wherein
said individual line elements of said flow path defining layer have diameters greater than diameters of line-shaped grid elements of said support layers.

17. A filter material according to claim 4 wherein
said multi-layer medium has a layer structure in a fluid flow direction therethrough as viewed from an inside to an outside of said flow path defining layer, an adjacently disposed flow path defining layer, a support layer, a filter layer, and at least one of a further flow path defining layer or a support layer.

18. A flow path defining layer for a filter material, the flow path defining layer comprising:
individual line elements forming a mesh or grid and being arc-shaped or curved at least to some extent, two of said individual line elements extend adjacent to one another in an arc-shaped manner at least to some extent and define flow chambers between pairs of two consecutive cross points of said two of said individual line elements, a largest opening of each of said flow chambers being formed between two apexes of arc-shaped courses of said two of said individual line elements, said arc-shaped courses of said two of said individual line elements being spaced apart from one another, said two of said individual line elements resting against one another and being on top of one another at said cross points, said two of said individual line elements form angles therebetween that gradually change within a repeat of a repeating pattern of said two of said line elements.

Assignees

• Hydac Filtertechnik Gmbh

Inventors

• Schwender Matthias

Classifications

• B01D39/16

  of organic material, e.g. synthetic fibres · CPC title

• B01D39/086

  of inorganic material · CPC title

• B01D39/1623

  of synthetic origin · CPC title

• B01D39/083 Primary

  of organic material · CPC title