Filter and filter device for a spray system

Abstract

The invention relates to a filter (1) for a spray system, comprising a housing (2) having an inlet (3) and an outlet (4), in which housing (2) a flat, zigzag-folded filter medium (5) is accommodated, which filter medium (5) is spaced from the inlet (3) forming at least one collection volume (6) for flow homogenization, the invention further relates to a filtering device.

Description

Technical Field

[0001] The present invention relates to a filter for a spraying system, the filter comprising a housing with an inlet and an outlet, wherein a flat, zigzag-folded filter medium is accommodated in the housing. The present invention also relates to a filter device for a spraying system. Background Art

[0002] Such a filter is known from WO 2023 / 062199 A1. It is suitable for use in the area of ​​a spray chamber for receiving paint mist and for filtering the exhaust air discharged from the spray chamber. The exhaust air discharged from the spray chamber contains particles that remain in the air while the object is being coated, for example, by painting, and do not adhere to the object. These particles, or paint particles, are also referred to as paint mist or overspray.

[0003] Depending on the coating method, the amount of overspray or paint mist can be very high and can account for up to half of the total particles emitted by the coating system. Consequently, the filter systems used to clean the air exiting the spray booth are subject to a high particle load, which can have an impact on their service life, for example. Summary of the Invention

[0004] The object of the present invention is to provide a filter for a spraying system having a longer service life.

[0005] This object is achieved by the features of claim 1. The dependent claims relate to advantageous embodiments.

[0006] The filter for a spraying system according to the invention comprises a housing with an inlet and an outlet, in which a flat, zigzag-folded filter medium is accommodated, which is spaced apart from the inlet to form a collecting volume.

[0007] The collection volume, also called the plenum, provided in the housing enables more uniform loading of the filter medium, which is also accommodated in the housing. Particle-laden air flows into the housing via the inlet, is first evenly distributed over the surface of the filter medium in the region of the collection volume, then flows through the filter medium and finally leaves the housing via the outlet. Homogenization of the inflowing air, particularly in the region of the collection volume, ensures a uniform loading of the filter medium with particles, thereby extending the service life of the filter medium.

[0008] The collection volume can extend over at least one-quarter of the housing depth, and the folded filter medium can extend over a maximum of three-quarters of the housing depth. In this embodiment, the collection volume takes up a large amount of space within the housing, which allows for particularly good flow homogenization of the inflowing air. Consequently, a particularly uniform loading of the filter medium can be achieved.

[0009] The filter medium can be held in the housing in a form-fitting and / or force-fitting manner. This form-fitting and / or force-fitting securing ensures that the filter medium is always spaced apart from the inlet when forming a collection volume. Furthermore, it is conceivable to remove the filter medium from the housing in a non-destructive manner and dispose of it separately.

[0010] A support element can be provided in the housing, against which the filter medium rests at least partially. The support element is preferably designed such that, on the one hand, it secures the position of the filter medium in the housing. On the other hand, the support element can also predetermine and also secure the filter medium's sawtooth shape, i.e., its shape.

[0011] The collection volume can be equipped with a first support element. In this case, the first support element ensures a predetermined distance between the filter medium and the inlet, thereby ensuring the availability of the collection volume. The first support element can be strip-shaped and have a V-shaped groove that shapes the edge of the filter medium facing the inlet. The first support element can divide the collection volume into a plurality of sub-volumes.

[0012] The first support element can extend beyond the edge of the filter medium and form a shoulder on which the filter medium can be supported. This improves the stability of the filter medium fixed in the housing.

[0013] A second supporting element associated with the outlet can be provided. The second supporting element secures the filter medium in the area of ​​the outlet and in the housing. The second supporting element can be strip-shaped and have a groove for shaping the edge of the filter medium facing the outlet.

[0014] By virtue of the described configuration of the first and second support elements, a flat filter medium can be used which has a zigzag shape due to the grooves introduced into the first and second support elements.

[0015] The edge of the filter medium assigned to the outlet can be shaped so that an undercut is formed on the side of the edge facing the inlet. When viewed from the inlet toward the outlet, the section of the filter medium extending toward the edge widens again in the region of the undercut. This widening allows for delayed loading of the filter medium in the region of the edge on the outlet side, and prevents premature wear of the filter medium in the region of the edge. The paint-laden air is deflected in the region of the undercut. Here, paint particles can only conditionally follow the air flow, so that the filter medium is loaded with paint particles more slowly in the region of the undercut. Therefore, providing an undercut in the region of the edge assigned to the outlet further extends the service life of the filter.

[0016] The shaping of the filter medium with this design of undercut is preferably achieved by a second support element that is shaped like a keyhole in the region of the undercut to be formed. The transition from the conical region to the rounded undercut can be sharp-edged, so that the porous filter medium can hook onto the sharp-edged transition and thereby secure the filter medium in a fixed position.

[0017] The edges associated with the outlet can be rounded. This allows for excellent flow homogenization and significantly extends the service life of the filter medium. Viewed in cross section, the undercut can be substantially circular. The radius of the circular undercut is preferably between 5 mm and 25 mm.

[0018] The filter medium can include at least one layer of nonwoven fabric. Due to the material's porosity, this layer is particularly suitable for filtering particles from the spray. Furthermore, the porous material of the filter medium can hook onto filter components, in particular onto a support element, thereby improving the fixing of the filter medium in the housing. This is particularly advantageous because the absorption of the spray is accompanied by a high mass loading of the filter medium.

[0019] Here, the filter medium can be designed as a single layer or multiple layers and can have, for example, different nonwoven layers with different porosities. It is also conceivable that at least individual layers of the filter medium have an electrostatic effect.

[0020] The housing and / or the supporting element can be made of cardboard. As a result, the filter is dimensionally stable and can be manufactured particularly economically and easily.

[0021] The filter device for a spraying system according to the present invention comprises a first filter stage facing the spray and a second filter stage, wherein the second filter stage is a filter as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a detailed description of several design solutions of the filter according to the present invention with reference to the accompanying drawings. These drawings schematically illustrate:

[0023] Figure 1 The filter is shown with a spatial diagram of the front;

[0024] Figure 2 The filter is shown with the space diagram at the rear;

[0025] Figure 3 The filter housing is shown in cross-section;

[0026] Figure 4 showing the filter in cross-section; and

[0027] Figure 5 Shown is a filter arrangement for a spray system. DETAILED DESCRIPTION

[0028] The figures show a filter 1 for a spraying system, comprising a housing 2 made of cardboard with an inlet 3 and an outlet 4. The housing 2 is essentially cuboid and has the inlet 3 on one end and the outlet 4 on the opposite end. A flat, zigzag-folded filter medium 5 is accommodated in the housing 2. The filter medium 5 comprises a layer 9 of nonwoven fabric. In an alternative design, the filter medium 5 comprises a plurality of layers 9 of nonwoven fabric.

[0029] The filter medium 5 is arranged in the housing 2 such that it is spaced apart from the inlet 3, thereby forming a collecting volume 6. Relative to the depth of the housing 2, the collecting volume 6 extends over 1 / 4 of the depth, while the folded filter medium extends over 3 / 4 of the depth.

[0030] A support element 7 is provided in the housing 2, against which the filter medium 5 rests. A first support element 7' is assigned to the collection volume 6, and a second support element 7'' is assigned to the outlet 4. Each support element 7 is strip-shaped and has a V-shaped groove, which is used to shape the edge of the filter medium 5 facing the inlet 3 or outlet 4. The support elements 7 are made of cardboard. The filter medium 5 is held in the housing 2 in a form-fitting and force-fitting manner to prevent loss.

[0031] The edge 8 of the filter medium 5 associated with the outlet 4 is shaped such that an undercut 10 is formed on the side of the edge 8 facing the inlet 3 . The edge 8 associated with the outlet 4 is rounded. The shaping is achieved so that the rounded undercut 10 has a radius of approximately 16 to 20 mm. The depth of the undercut is between 7 and 12 mm. This design of the undercut 10 of the edge 8 can be achieved by correspondingly shaping the recess of the second support element 7 ″.

[0032] Figure 1 and 2 The filter 1 is shown in a spatial diagram, wherein Figure 1 In the figure, the inlet 3, the collecting volume 6 and the supporting element 7' assigned to the inlet 3 can be seen, and in the figure, Figure 2 The outlet 4 and the supporting element 7 ″ associated therewith can be seen. The first supporting element 7 ′ divides the collecting volume 6 into three partial volumes.

[0033] Figure 3 The housing 2 is shown in section with the support elements 7 ′, 7 ″ arranged therein. In particular, the V-shaped grooves in the support elements 7 ′, 7 ″ for shaping the filter medium 5 and the circular extensions in the grooves for realizing the design of the circular undercut 10 in the filter medium 5 can be seen.

[0034] The first supporting element 7 ′ covers the filter edge of the filter medium 5 facing the collection volume 6 and forms a shoulder 14 which supports the filter medium 5 in the region of the filter edge.

[0035] The second support element 7 ″ has a keyhole-shaped recess in which the undercut 10 of the filter medium 5 is formed. The transition 15 between the conical section and the circular section is designed to be sharp-edged, so that the filter medium 5 made of porous material hooks onto the second support element 7 ″ in the transition 15 .

[0036] Figure 4 The filter 1 is shown in a sectional view. In this figure, the undercut 10 of the zigzag-folded filter medium 5 can be seen, which is formed by the shaping of the support element 7 ″. The collection volume 6 is also shown.

[0037] Figure 5 The filter device 11 for a spraying system is shown, wherein the filter 1 is a component of the filter device 11. The filter device 11 is used to filter the spray, in particular to absorb the overspray. The filter device 11 has a first filter stage 12 facing the spray and a second filter stage 13 downstream, wherein the second filter stage 13 is based on Figures 1 to 4 Filter 1.

Claims

1. A filter (1) for a spraying system, comprising a housing (2) with an inlet (3) and an outlet (4), wherein a flat, zigzag-folded filter medium (5) is accommodated in the housing (2), characterized in that: The filter medium (5) is spaced apart from the inlet (3) to form at least one collecting volume (6) for flow homogenization.

2. The filter according to claim 1, characterized in that The filter medium (5) is held in the housing (2) in a form-fitting and / or force-fitting manner.

3. The filter according to claim 1 or 2, characterized in that: A support element (7) is arranged in the housing (2), and the filter medium (5) rests at least partially on the support element (7).

4. The filter according to claim 3, characterized in that A first supporting element (7') is associated with the collecting volume (6).

5. The filter according to claim 4, characterized in that A shoulder (14) is formed by the first supporting element (7'), on which the filter medium (5) is supported.

6. The filter according to any one of claims 3 to 5, characterized in that A second supporting element (7") is associated with the outlet (4).

7. The filter according to claim 6, characterized in that The filter medium (5) is partially hooked onto the second support element (7").

8. The filter according to any one of claims 1 to 7, characterized in that The edge (8) of the filter medium (5) associated with the outlet (4) is shaped in such a way that an undercut (10) is formed on the side of the edge (8) facing the inlet (3).

9. The filter according to claim 8, characterized in that The edge (8) associated with the outlet (4) is rounded.

10. The filter according to any one of claims 1 to 9, characterized in that The filter medium (5) comprises at least one layer (9) of nonwoven fabric.

11. The filter according to any one of claims 1 to 10, characterized in that The housing (2) and / or the supporting element (7) are made of cardboard.

12. The filter according to any one of claims 1 to 11, characterized in that The collecting volume (6) extends over at least 1 / 4 of the depth of the housing (2), and the folded filter medium (5) extends over a maximum of 3 / 4 of the depth of the housing (2).

13. A filter device (11) for a spraying system, comprising a first filter stage (12) facing the spray and a second filter stage (13) arranged downstream of the first filter stage (12), the second filter stage (13) being a filter (1) according to any one of the preceding claims.

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