Gas filter insert

Abstract

The invention relates to a gas filter insert (10) for inserting into an insert receptacle of a filtration device, comprising a multi-layer structure (12), which has two electrically conductive polarisation layers (18a, 18b) and a dielectric filter layer (22) which is arranged between the polarisation layers (18a, 18b) and can be polarised by means of the polarisation layers (18a, 18b), wherein the layer structure (12) has a dry layer (24) which is arranged between the polarisation layers (18a, 18b) and is designed to remove one or more fluids (F) which impair the polarisation of the filter layer (22).

Description

[0001] Münster, October 1, 2025

[0002] Our reference: HE1209-02WO

[0003] Official file number: New registration

[0004] Applicant: Stallion SE

[0005] Nienkamp 55-85 48147 Münster

[0006] Gas filter insert

[0007] The invention relates to a gas filter insert for insertion into an insert holder of a filtration device, with a multi-layered structure comprising two electrically conductive polarization layers and a dielectric filter layer arranged between the polarization layers and polarizable by means of the polarization layers.

[0008] The filter performance and efficiency of electrically actuated filter elements with a multi-layer structure and a polarization function depend particularly on the achievable polarization voltage. The achievable polarization voltage can be reduced by the introduction of moisture and liquid into the layer structure.

[0009] Since the introduction of moisture and liquid into the layer structure of the filter element also leads to a reduction in the voltage that can be tolerated without flashover, the introduction of moisture and liquid into the layer structure also leads to a significantly increased risk of short circuits.

[0010] The object underlying the invention is therefore to reduce the impairment of the polarization function of the filter element caused by moisture and / or liquids.

[0011] The problem is solved by a gas filter element of the type mentioned above, wherein the layer structure of the gas filter element according to the invention comprises a dry layer arranged between the polarization layers, which is designed to remove one or more fluids that impair the polarization of the filter layer. By removing the one or more fluids that impair the polarization of the filter layer through the dry layer, the reduction of the generable polarization voltage caused by moisture and / or liquid is avoided or at least delayed and / or reduced. Furthermore, the risk of a short circuit between the polarization layers when moisture and / or liquid enters the layer structure of the gas filter element is significantly reduced by the dry layer.The dry layer dries relatively quickly and preferably has a coarse-pored structure characterized by high permeability and low capillary forces. This ensures that liquid is quickly drained from the layer and not absorbed from adjacent layers or layers of the multi-layer structure. Overall, the dry layer significantly reduces moisture- and / or liquid-related impairment of the polarization function of the gas filter element.

[0012] The dry layer preferably significantly improves the insulation of the polarization layers from each other, thus reducing the tendency for rollover.

[0013] A fluid that impairs the polarization of the filter layer can be a liquid, for example, water. The water can, for instance, form from condensation of humid air. Humid air can also be a fluid that impairs the polarization of the filter layer.

[0014] The layer structure can be a pleated composite. The filter layer can be a dielectric nonwoven layer.

[0015] In a preferred embodiment of the gas filter element according to the invention, the dry layer has a free volume for the temporary absorption of one or more fluids. The dry layer does not permanently store the fluid(s) that impair the polarization of the filter layer. Rather, the dry layer quickly drains away liquids, particularly any penetrating water. This results from the coarse-pored material of the dry layer, in which no or only minimal capillary forces act. In another preferred embodiment of the gas filter element according to the invention, the dry layer has a total volume, wherein the free volume is at least 30%, preferably at least 50%, of the total volume of the dry layer. Particularly preferably, the free volume of the dry layer is at least 70% of the total volume of the dry layer.The comparatively large free volume prevents or at least greatly reduces capillary force-generating structures, thus reducing the absorption properties of the dry layer.

[0016] The gas filter element according to the invention is further advantageously developed in that the dry layer comprises a plurality of spacer elements which are configured to space the layers of the layer structure adjacent to the dry layer apart from one another. The spacer elements can be, for example, dot-shaped or elongated, in particular strip-shaped. The spacer elements can be, for example, dots of adhesive, beads of adhesive, or beads of adhesive. The spacer elements can also be formed by spray material which has been sprayed onto a layer of the layer structure. The spacer elements can also be formed by plastic elements, for example, plastic bridges, which are attached to a layer of the layer structure, in particular by gluing or welding.

[0017] In a further preferred embodiment of the gas filter element according to the invention, the dry layer comprises a grid structure or a sieve structure, or is designed as a grid structure or sieve structure. The grid structure or sieve structure is preferably made of an electrically non-conductive material, in particular plastic. The grid structure can be an expanded plastic grid. The grid structure or sieve structure can have several creases or folds and / or be part of a pleated layer structure having several creases or folds. The grid can be hydrophobic, for example, coated with a hydrophobic material or itself formed from a hydrophobic material, so that water is not retained in the grid structure and is readily drained away. A gas filter element according to the invention in which the dry layer is designed as a textile is also preferred.The textile can be, for example, a knitted or woven fabric. The textile can be made of hydrophobic fibers, thus minimizing the water absorption tendency of the drying layer.

[0018] Furthermore, a gas filter insert according to the invention is advantageous in which the dry layer has a dry layer thickness of at least 0.3 mm. Preferably, the dry layer has a dry layer thickness of at least 0.6 mm. A corresponding dry layer thickness ensures suitable spacing of the polarization layers from one another, so that polarization interferences due to spacing are avoided and the tendency to roll over is reduced due to spacing.

[0019] The gas filter element according to the invention is further advantageously developed by designing the dry layer as a liquid-permeable drainage layer. By being designed as a liquid-permeable drainage layer, the dry layer allows the removal or transport of one or more fluids that impair the polarization of the filter layer from the multi-layer structure, thus further reducing the probability of liquid- and / or moisture-related impairment of the polarization function and the tendency for the filter to overflow.

[0020] Furthermore, a gas filter insert according to the invention is preferred in which the dry layer is formed, at least partially, from a hydrophobic material. The dry layer can be formed from a water-repellent drainage material. In one embodiment, the dry layer can comprise or be formed from an aerogel with hydrophobic properties. In another embodiment, the dry layer can comprise or be formed from an aerogel-coated material with hydrophobic properties. The aerogel can be formed from silicon dioxide, in particular amorphous silicon dioxide. The aerogel can be a silica aerogel based on silicates. The hydrophobic material further reduces the liquid-induced impairment of the polarization function.In embodiments using an aerogel, conductive connections between the electrically conductive polarization layers are preferably effectively prevented via the liquid. The electrical resistance of the layered structure increases exponentially and reduces the tendency for flashover.

[0021] Furthermore, a gas filter element according to the invention is preferred in which the layer structure is configured to allow flow from an inlet side to an outlet side, wherein the dry layer is arranged either on the inlet side or the outlet side of the filter layer. If the dry layer is arranged on the inlet side of the filter layer, the gas to be filtered flows through the dry layer upstream of the filter layer. If the dry layer is arranged on the outlet side of the filter layer, the filtered gas flows through the dry layer after passing through the filter layer. On the outlet side, the dry layer can form the penultimate layer of the layer structure to ensure good drainage of liquid from the dry layer.

[0022] In a further preferred embodiment of the gas filter element according to the invention, the layer structure comprises at least one activated carbon layer, which is preferably arranged between the polarization layers. The activated carbon layer can comprise a support layer and a carbon layer, wherein the activated carbon material of the carbon layer is supported by the support layer. For comparatively thick activated carbon layers, several activated carbon layers can also be arranged one above the other.

[0023] Furthermore, a gas filter insert according to the invention is advantageous in which the activated carbon layer is arranged on the inlet side of the filter layer. Alternatively or additionally, the dry layer is arranged on the inlet or outlet side of the activated carbon layer.

[0024] Preferred embodiments of the invention are explained and described in more detail below with reference to the accompanying drawings. Figure 1 shows a gas filter insert according to the invention in a perspective view;

[0025] Fig. 2 shows the layer structure of the gas filter insert shown in Fig. 1 in a schematic representation;

[0026] Fig. 3 shows the layer structure of a gas filter insert according to the invention in a schematic sectional view;

[0027] Fig. 4 shows the layer structure of another gas according to the invention.

[0028] Filter insert in a schematic sectional view;

[0029] Fig. 5 shows the layer structure of another gas according to the invention.

[0030] Filter insert in a schematic sectional view;

[0031] Fig. 6 shows a schematic representation of the dry layer of a layer structure of a gas filter insert according to the invention;

[0032] Fig. 7 shows a schematic representation of the dry layer of a layer structure of another gas filter insert according to the invention; and

[0033] Fig. 8 shows a schematic representation of the dry layer of a layer structure of another gas filter insert according to the invention.

[0034] Fig. 1 shows a gas filter element 10 with polarization functions. The gas filter element 10 comprises a multilayer structure 12 with two electrically conductive polarization layers, an activated carbon layer, a filter layer, and a dry layer.

[0035] The layer structure 12 is a multiply folded, i.e., pleated, layer composite, wherein the layer composite is connected at its end-face material edges to material strips 14a, 14b, for example, by adhesive bonding. The material strips 14a, 14b can be designed as side lamination of the gas filter element 10. A contact element 16 is located on the material strip 14a, via which the gas filter element can be electrically connected to an electrical power supply for the implementation of the polarization function. Thus, a polarization voltage can be applied between the polarization layers of the layer structure 12 via the contact element 16.

[0036] As shown in Fig. 2, the multilayer structure 12 has two electrically conductive polarization layers 18a, 18b and a dielectric filter layer 22 arranged between the polarization layers 18a, 18b and polarizable by means of the polarization layers 18a, 18b. An activated carbon layer 20 is located between the polarization layer 18a and the filter layer 22.

[0037] The layer structure 12 further comprises a dry layer 24 arranged between the polarization layers 18a and 18b. The dry layer 24 is designed to drain away a fluid F, namely liquid, that impairs the polarization of the filter layer 22. By draining the fluid F, which impairs the polarization of the filter layer 22, through the dry layer 24, a reduction in the generable polarization voltage caused by moisture and liquid is avoided or at least delayed and / or reduced. Furthermore, the risk of a short circuit between the polarization layers 18a and 18b when moisture and / or liquid enters the layer structure 12 of the gas filter element 10 is significantly reduced by the dry layer 24.

[0038] In the illustrated embodiment, the dry layer 24 has a free volume for receiving the fluid F and is simultaneously designed as a drainage layer for removing the temporarily absorbed fluid. The dry layer 24 drains any penetrating water through the material structure by exerting no or only minimal capillary forces. In the illustrated embodiment, the dry layer 24 has a plurality of spacer elements 26, which space the layers 22, 18b of the layer structure 12 adjacent to the dry layer 24 from one another.

[0039] In other embodiments, the dry layer 24 can comprise or be configured as a grid or sieve structure. The spacer elements 26 and / or the grid or sieve structure are made of an electrically non-conductive material. If the dry layer 24 comprises or is configured as a grid structure, the grid structure can be an expanded plastic mesh.

[0040] The gas filter element 10 is traversed by the gas to be filtered in flow direction R from an inlet side to an outlet side. The dry layer 24 is arranged on the outlet side of the filter layer 22. Furthermore, the dry layer 24 is arranged on the outlet side of the activated carbon layer 20. The activated carbon layer 20 is arranged on the inlet side of the filter layer 22.

[0041] Figures 3 to 5 show different layer structures 12 of gas filter inserts 10.

[0042] In the layer structure 12 shown in Fig. 3, the polarization layer 18a is located on the inlet side of the gas filter element 10. The carbon layer 28 of the activated carbon layer 20 borders the polarization layer 18a on the outlet side. The support layer 30 of the activated carbon layer 20 borders the carbon layer 28 on the outlet side. The activated carbon material of the carbon layer 28 is supported by the support layer 30. The filter layer 22 borders the support layer 30 on the outlet side. The dry layer 24 borders the filter layer 22 on the outlet side. The polarization layer 18b borders the dry layer 24 on the outlet side.

[0043] In the layer structure 12 shown in Fig. 4, the polarization layer 18a is located on the inlet side of the gas filter element 10. The carbon layer 28 of the activated carbon layer 20 borders the polarization layer 18a on the outlet side. The support layer 30 of the activated carbon layer 20 borders the carbon layer 28 on the outlet side. The dry layer 24 borders the support layer 30 on the outlet side. The filter layer 22 borders the dry layer 24 on the outlet side. The polarization layer 18b borders the filter layer 22 on the outlet side. In the layer structure 12 shown in Fig. 5, the polarization layer 18a is located on the inlet side of the gas filter element 10. The dry layer 24 borders the polarization layer 18a on the outlet side. The carbon layer 28 of the activated carbon layer 20 borders the dry layer 24 on the outlet side.The support layer 30 of the activated carbon layer 20 borders the carbon layer 28 on the outlet side. The filter layer 22 borders the support layer 30 of the activated carbon layer 20 on the outlet side. The polarization layer 18b borders the filter layer 22 on the outlet side.

[0044] Figures 6 to 8 show different embodiments of spacer elements 28 of a dry layer 24.

[0045] In the embodiment shown in Fig. 6, the spacer elements 26 are formed as points. The spacer elements 26 can, for example, be adhesive points. The adhesive points are arranged at intervals from the fold creases 32 of the layer structure 12 and extend along several rows of points.

[0046] In the layer structure 12 shown in Fig. 7, the spacer elements 26 are designed as elongated strips of material which extend over the folds 32 of the layer structure 12. The strip-shaped spacer elements 26 are spaced apart from each other in the direction of their length, so that a spacer-free layer structure 12 is located between the folds 32.

[0047] In the layer structure 12 shown in Fig. 8, the spacer elements 26 are designed as elongated strips of material which extend in the direction of travel over the entire layer structure 12. The individual spacer elements 26 thus extend across several folds 32. Reference numeral

[0048] 10 gas filter inserts

[0049] 12 layer structure 14a, 14b material strips

[0050] 16 Contact member

[0051] 18a, 18b Polarization positions

[0052] 20 activated carbon layers

[0053] 22 Filter layer 24 Dry layer

[0054] 26 spacer elements

[0055] 28 Coal layer

[0056] 30 carrier layer

[0057] 32 folds

[0058] F Fluid

[0059] R Flow direction

Claims

Claims 1. Gas filter insert (10) for insertion into an insert receptacle of a filtration device, with a multi-layered structure (12) comprising two electrically conductive polarization layers (18a, 18b) and a dielectric filter layer (22) arranged between the polarization layers (18a, 18b) and polarizable by means of the polarization layers (18a, 18b), characterized in that the structure (12) comprises a dry layer (24) arranged between the polarization layers (18a, 18b) which is configured to drain one or more fluids (F) that impair the polarization of the filter layer (22).

2. Gas filter insert (10) according to claim 1, characterized in that the dry layer (24) has a free volume for the temporary absorption of one or more fluids (F).

3. Gas filter insert (10) according to claim 2, characterized in that the dry layer (24) has a total layer volume, wherein the free volume is at least 30 percent, preferably at least 50 percent, of the total layer volume of the dry layer (24).

4. Gas filter insert (10) according to one of the preceding claims, characterized in that the dry layer (24) comprises a plurality of spacer elements (26) which are arranged to space the layers of the layer structure (12) adjacent to the dry layer (24) apart from each other.

5. Gas filter insert (10) according to one of the preceding claims, characterized in that the dry layer (24) comprises a grid structure or a sieve structure or is designed as a grid structure or sieve structure.

6. Gas filter insert (10) according to one of the preceding claims, characterized in that the dry layer (24) is designed as a textile.

7. Gas filter insert (10) according to one of the preceding claims, characterized in that the dry layer (24) has a dry layer thickness of at least 0.3mm, preferably a dry layer thickness of at least 0.6mm.

8. Gas filter insert (10) according to one of the preceding claims, characterized in that the dry layer (24) is designed as a liquid-permeable drainage layer.

9. Gas filter insert (10) according to one of the preceding claims, characterized in that the dry layer (24) is formed at least sectionally from a hydrophobic material.

10. Gas filter insert (10) according to one of the preceding claims, characterized in that the layer structure (12) is arranged to be flowed through from an inlet side to an outlet side, wherein the dry layer (24) is arranged on the inlet side or outlet side of the filter layer (22).

11. Gas filter insert (10) according to one of the preceding claims, characterized in that the layer structure (12) has at least one activated carbon layer (20) which is preferably arranged between the polarization layers (18a, 18b).

12. Gas filter insert (10) according to claim 11 , characterized in that the activated carbon layer (20) is arranged on the inlet side of the filter layer (22); and / or the dry layer (24) is arranged on the inlet or outlet side of the activated carbon layer (20).

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