Antibacterial air filtering non-woven fabric and filtering device

Abstract

The utility model discloses an antibacterial air filtering non-woven fabric which comprises a pre-filtering layer and a fine filtering layer, the fine filtering layer is fixedly arranged on the exhaust side of the pre-filtering layer; the surface, facing the pre-filtering layer, of the fine filtering layer is provided with a plurality of closed annular protruding parts, annular concave parts of the protruding parts are arranged on the exhaust side of the pre-filtering layer at intervals in a blocking mode, and the pre-filtering layer is made of antibacterial elastic non-woven fabric. The antibacterial air filtering non-woven fabric is provided with a closed annular lug boss and an elastic pre-filtering layer, the pressure difference between the air inlet side and the air outlet side of the non-woven fabric deforms, the elastic pre-filtering layer deforms towards the fine filtering layer during filtering, the deformation amplitude of the pre-filtering layer and the size change of the filtering holes are limited by the fine filtering layer, and the elastic pre-filtering layer deforms away from the fine filtering layer during pulse back flushing. When the two states are switched, the deformation amplitude of the pre-filtering layer is larger, accumulated dust can be fully separated from the pre-filtering layer, and the pulse blowback effect is optimized. The utility model further discloses a filtering device.

Description

Technical Field

[0001] The utility model relates to the technical field of air filtering materials, in particular to an antibacterial air filtering nonwoven fabric and a filtering device. Background Art

[0002] Air filter nonwoven fabric is a consumable material that effectively reduces particulate matter in the air and is widely used in automobiles, purification workshops, filter cartridges, filter bags and other products.

[0003] Taking the cylindrical filter element as an example, as the air filtration time increases, the particulate matter attached to the air inlet surface increases. The pulse back-blowing air filter is equipped with an electromagnetic pulse valve and an auxiliary air source. When the electromagnetic pulse valve is opened, the clean high-pressure airflow quickly passes through the filter material and impacts the particulate matter attached to the air inlet surface of the filter cartridge. Most of the accumulated dust leaves the air inlet surface of the filter cartridge along with the high-pressure airflow.

[0004] The layer structure of air filter nonwoven fabric mainly includes two layers: pre-filter layer and fine filter layer. The pore size of pre-filter layer is larger than that of fine filter layer, and pre-filter layer constitutes the air inlet surface of filter material. In the prior art, pre-filter layer and fine filter layer are combined into an integrated structure. Compared with filter bag, the filter material of filter element is limited by flanges at both ends, clamps or tie bands on the periphery, the filter material itself is less deformed, and the pressure of high-pressure airflow must be strictly controlled. Further improving the pulse back-flushing effect of filter element is one of the main problems in the production of filter material and filter element. Utility Model Content

[0005] One of the purposes of the utility model is to overcome the defects in the prior art and provide an antibacterial air filtration nonwoven fabric, wherein the elastic pre-filter layer deforms with the pressure difference between the air inlet side and the exhaust side of the nonwoven fabric, thereby improving the pulse backflushing effect of the filter element.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: an antibacterial air filtration nonwoven fabric, comprising:

[0007] Pre-filter layer;

[0008] A fine filter layer, fixedly arranged on the exhaust side of the pre-filter layer;

[0009] The surface of the fine filter layer facing the pre-filter layer is provided with a plurality of closed annular protrusions, the inner recesses of the protrusions are spaced and blocked at the exhaust side of the pre-filter layer, and the pre-filter layer is an antibacterial elastic non-woven fabric.

[0010] A preferred technical solution is that a separation ridge is provided in the raised portion, and the separation ridge separates the raised portion into at least two raised units of closed shapes.

[0011] A preferred technical solution is that the fine filtration layer between the pre-filtration layer and the protrusion is punctured and entangled.

[0012] A preferred technical solution is that the fine filtration layer extends along a first direction, and a plurality of the protrusions are arranged at intervals from each other along the first direction.

[0013] A preferred technical solution is that a fluoroplastic microporous membrane layer is compositely provided on the surface of the pre-filtration layer facing away from the fine filtration layer.

[0014] A preferred technical solution is that a support portion is provided in the protrusion unit, the support portion has a protrusion top surface which is away from the fine filtration layer and abuts against the pre-filtration layer, and the protrusion height of the support portion is smaller than that of the protrusion unit.

[0015] A preferred technical solution is that the fine filtration layer includes a compositely connected filtration substrate layer and a non-woven protrusion layer, and the protrusion is arranged on the non-woven protrusion layer.

[0016] The second object of the utility model is to provide a filtering device, including a filtering part made of the above-mentioned air filtering non-woven fabric.

[0017] A preferred technical solution is that the filter portion is a pleated structure composed of continuous V-shaped grooves, the pre-filter layer is located on the groove surface of the V-shaped groove; and the protrusion is arranged on at least one groove surface of the V-shaped groove.

[0018] The preferred technical solution is that the groove surface of the V-shaped groove has a relative groove bottom edge and groove top edge, the raised portion is spaced apart from the groove bottom edge and the groove top edge, the distance between the raised portion and the groove top edge is L1, the distance between the raised portion and the groove bottom edge is L2, and L1 is smaller than L2.

[0019] The advantages and beneficial effects of the utility model are:

[0020] The antibacterial air filtering nonwoven fabric is provided with a closed annular protrusion and an elastic pre-filter layer; the nonwoven fabric is deformed due to the pressure difference between the air inlet side and the air exhaust side, and the elastic pre-filter layer is deformed away from the fine filter layer during filtering, and the deformation amplitude of the pre-filter layer and the size change of the filter hole are limited by the fine filter layer. During pulse backblowing, the elastic pre-filter layer is deformed away from the fine filter layer. Compared with the nonwoven fabric with a completely composite layer between layers, the deformation amplitude of the pre-filter layer is larger when switching between the two states, which is conducive to the dust accumulation to fully separate from the pre-filter layer and optimize the pulse backblowing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 2. It is a schematic diagram of the three-dimensional structure of the antibacterial air filtration nonwoven fine filtration layer of the embodiment;

[0022] Figure 2 yes Figure 1 A schematic diagram of the top view of the structure of the embodiment;

[0023] Figure 3 is along Figure 2 Sectional view of AA in the middle;

[0024] Figure 4 It is a cross-sectional view of the air filter nonwoven fabric in the filtering state;

[0025] Figure 5 It is a cross-sectional view of the air filter nonwoven fabric in the pulse backflush state;

[0026] Figure 6 is a cross-sectional view of an antibacterial air filtration nonwoven fabric according to another embodiment;

[0027] Figure 7 is a cross-sectional view of an antibacterial air filtration nonwoven fabric according to another second embodiment;

[0028] Figure 8 It is a structural schematic diagram of the filter part in the filter device;

[0029] In the figure: 1, pre-filtration layer; 2, fine filtration layer; 201, filtration base material layer; 202, non-woven raised layer; 2a, raised portion; 2b, dividing strip; 2c, supporting portion; 3, fluoroplastic microporous membrane layer; 4, V-shaped groove. DETAILED DESCRIPTION

[0030] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0031] In the description of the present application, it should be noted that, unless otherwise specified, “plurality” means more than two; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] Example

[0034] like Figure 1-5As shown, the antibacterial air filtration nonwoven fabric of the embodiment comprises a pre-filter layer 1 and a fine filter layer 2; the fine filter layer 2 is fixedly arranged on the exhaust side of the pre-filter layer 1; a plurality of closed annular protrusions 2a are arranged on the surface of the fine filter layer 2 facing the pre-filter layer 1, and the inner recesses of the protrusions 2a are spaced and blocked on the exhaust side of the pre-filter layer 1, and the pre-filter layer 1 is an antibacterial elastic nonwoven fabric.

[0035] It is understandable that the pore size of the fine filter layer 2 is smaller than the pore size of the pre-filter layer 1. During filtration, the elastic pre-filter layer 1 is deformed toward the fine filter layer 2, and the deformed pre-filter layer 1, the protrusion 2a and the fine filter layer 2 enclose an ash holding cavity of the fine filter layer 2, especially at the angle formed by the protrusion 2a and the fine filter layer 2.

[0036] During pulse backwashing, the elastic pre-filter layer 1 is deformed away from the fine filter layer 2, and its deformation amplitude is greater than that of the pre-filter layer 1 during filtration; the deformation amplitude of the pre-filter layer 1 is large, and the filter pore size is slightly increased, which increases the probability of small particles in the layer escaping from the pre-filter layer 1.

[0037] The elasticity of the pre-filter layer 1 is specifically micro-elastic, so as to increase the deformation of the pre-filter layer 1 during pulse back-blowing. In order to avoid the obvious enlargement of the filter holes of the pre-filter layer 1 in the filtering state and the deterioration of the filtering accuracy, the elasticity of the pre-filter layer 1 must be determined in combination with the protrusion height of the protrusion 2a, the pressure difference on both sides of the air filter non-woven fabric, and the degree of deformation of the fine filter layer 2 under the pressure of the pre-filter layer 1.

[0038] The shape of the protrusion 2a can be selected from known shapes such as circle, ellipse, rectangle, hexagon, etc.

[0039] The connection between the pre-filter layer 1 and the protrusion 2a in the recessed area can be selected to be thermal composite bonding, point glue bonding, or entangled into one by puncturing fibers.

[0040] The laid fibers of the antibacterial elastic nonwoven fabric include antibacterial fibers (including but not limited to fibers loaded with silver ion antibacterial agents and guanidine antibacterial agents) and elastic fibers (including but not limited to elastic polyester fibers), or include fibers that are both antibacterial and elastic.

[0041] like Figure 1 As shown, in some preferred embodiments, a separation ridge 2b is provided in the raised portion 2a, and the separation ridge 2b separates the raised portion 2a into at least two raised units of closed shapes. The function of the separation ridge 2b is to reduce the size of the raised portion 2a, thereby reducing the deformation amplitude of the pre-filter layer 1 during filtration, and ensuring that the filtration aperture is maintained within a predetermined range.

[0042] In this embodiment, the protrusion 2a is in the shape of a long hole with opposite long sides, and the partitioning ridges 2b are connected between the opposite long sides to divide the long hole into ten smaller holes along the extending direction of the long sides.

[0043] In some preferred embodiments, the fine filter layer 2 between the pre-filter layer 1 and the protrusion 2a is punctured and entangled. Compared with bonding, puncture and entanglement have higher composite strength, which is beneficial to prolonging the service life of the air filter nonwoven fabric and the corresponding filter device.

[0044] like Figure 1 As shown, in some preferred embodiments, the fine filter layer 2 extends along a first direction (the X direction in the figure), and a plurality of protrusions 2a are arranged spaced apart from each other along the first direction. The non-woven fabric with spaced protrusions 2a is mainly produced into a filter cloth with a pleated structure, which is used in products such as filters and filter cartridges.

[0045] like Figure 6 As shown, in some preferred embodiments, the surface of the pre-filter layer 1 facing away from the fine filter layer 2 is compositely provided with a fluoroplastic microporous membrane layer 3. The fluoroplastic microporous membrane deforms with the pre-filter layer 1, and the particles accumulated on the surface of the fluoroplastic microporous membrane layer 3 are more easily detached.

[0046] like Figure 7 As shown, in some preferred embodiments, a support portion 2c is provided in the protrusion unit, and the support portion 2c has a protrusion top surface that is away from the fine filter layer 2 and abuts against the pre-filter layer 1, and the protrusion height of the support portion 2c is less than the protrusion unit. The protrusion height of the support portion 2c limits the deformation amplitude of the pre-filter layer 1 during filtration, and the support portion 2c, the fine filter layer 2, the protrusion 2a and the pre-filter layer 1 enclose an ash holding cavity. Compared with the non-woven fabric without the support portion 2c, the ash holding cavity of the fine filter layer has a larger accommodating space.

[0047] The support portion 2c may be in the shape of a long strip, or a point-shaped support portion 2c connected to the protruding unit through the long strip-shaped support portion 2c.

[0048] like Figure 7 As shown, in some preferred embodiments, the fine filter layer 2 includes a compositely connected filter substrate layer 201 and a non-woven protrusion layer 202, and the protrusion 2a is arranged on the non-woven protrusion layer 202. Furthermore, the support portion 2c is also arranged on the non-woven protrusion layer 202. Specifically, the non-woven protrusion layer 202 includes a base layer, and a protrusion 2a (and a support portion 2c) arranged on the base layer. The non-woven protrusion layer 202 can be optionally produced by airflow puncture, with the protrusion unit being approximately rectangular, and the support portion 2c being a line connecting opposite sides.

[0049] like Figure 8 As shown, the filter device of the embodiment includes a filter portion made of the above-mentioned air filtering non-woven fabric.

[0050] The filter part is a pleated structure composed of continuous V-shaped grooves 4 , the pre-filter layer 1 is located on the groove surface of the V-shaped groove 4 ; the raised portion 2 a is arranged on at least one groove surface of the V-shaped groove 4 .

[0051] like Figure 8 As shown, in some preferred embodiments, the groove surface of the V-shaped groove 4 has relative groove bottom edges and groove top edges, the raised portion 2a is spaced apart from the groove bottom edges and the groove top edges, the distance between the raised portion 2a and the groove top edge is L1, and the distance between the raised portion 2a and the groove bottom edge is L2, and L1 is smaller than L2.

[0052] The relative groove surface distance of the V-shaped groove 4 gradually increases from the groove bottom to the groove top, and the raised portion 2a is arranged close to the groove top edge and away from the groove bottom edge, so that the pre-filter layer 1 that is deformed relative to the groove surface during pulse backblowing has a larger mutual spacing, avoiding the problem of incomplete cleaning caused by the deformed pre-filter layers 1 approaching or abutting each other.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An antibacterial air filtration nonwoven fabric, comprising: Pre-filter layer; A fine filter layer, fixedly arranged on the exhaust side of the pre-filter layer; It is characterized in that a plurality of closed annular protrusions are arranged on the surface of the fine filter layer facing the pre-filter layer, the inner recesses of the protrusions are spaced apart and arranged on the exhaust side of the pre-filter layer, and the pre-filter layer is an antibacterial elastic non-woven fabric.

2. The antibacterial air filtration nonwoven fabric according to claim 1, characterized in that: A separation convex strip is arranged in the convex portion, and the separation convex strip separates the convex portion into at least two convex units of closed shapes.

3. The antibacterial air filtration nonwoven fabric according to claim 1, characterized in that: The pre-filter layer and the concave regions between the protrusions are punctured and entangled.

4. The antibacterial air filtration nonwoven fabric according to claim 1, characterized in that: The fine filter layer extends along a first direction, and a plurality of protrusions are arranged at intervals from each other along the first direction.

5. The antibacterial air filtration nonwoven fabric according to claim 1, characterized in that: The surface of the pre-filtering layer facing away from the fine-filtering layer is compositely provided with a fluoroplastic microporous membrane layer.

6. The antibacterial air filtration nonwoven fabric according to claim 2, characterized in that: A support portion is arranged inside the protruding unit. The support portion has a protruding top surface which is away from the fine filtering layer and abuts against the pre-filtering layer. The protruding height of the support portion is smaller than that of the protruding unit.

7. The antibacterial air filtration nonwoven fabric according to claim 1, characterized in that: The fine filtration layer comprises a compositely connected filtration substrate layer and a non-woven protrusion layer, and the protrusion is arranged on the non-woven protrusion layer.

8. A filtering device, characterized in that: A filter portion comprising the air filtering nonwoven fabric according to any one of claims 1 to 7.

9. The filtering device according to claim 8, characterized in that: The filter part is a pleated structure composed of continuous V-shaped grooves, the pre-filter layer is located on the groove surface of the V-shaped groove; and the protrusion is arranged on at least one groove surface of the V-shaped groove.

10. The filtering device according to claim 9, characterized in that: The groove surface of the V-shaped groove has a relative groove bottom edge and groove top edge, the protrusion is spaced from the groove bottom edge and the groove top edge, the distance between the protrusion and the groove top edge is L1, the distance between the protrusion and the groove bottom edge is L2, and L1 is smaller than L2.

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