A multi-layer filter bag

Abstract

The utility model discloses a multilayer filter bag belongs to filter bag technical field, including filter bag body and filter bag opening ring, the top of filter bag body is provided with filter bag opening ring, filter bag body includes support layer, main filter layer and prefilter layer, and this support layer, main filter layer and prefilter layer are by heat fusion mode and are compounded as integral structure from inside to outside, the support layer is polypropylene helical spring shape braided net, the hole of main filter layer outer surface is inverted ladder type setting, and this aperture decreases from inside to outside, and the outer surface of prefilter layer is set into V type pleat structure. The utility model discloses through the mode of heat fusion makes support layer main filter layer and prefilter layer compound, can avoid the pollution of filter liquid of gluing mode, improves the strength of filter bag body whole simultaneously, avoids the situation that filter bag body collapses in the process of filtering.

Description

Technical Field

[0001] This utility model relates to the field of filter bag technology, and in particular to a multi-layer filter bag. Background Technology

[0002] In the field of industrial filtration, filter bags are a key component in the operation of baghouse dust collectors. Cylindrical filter bags are typically suspended vertically in the dust collector. As the core filtration element, filter bags are widely used in solid-liquid separation scenarios in industries such as chemical, food, and pharmaceutical.

[0003] However, most existing filter bags are single-layered. Due to the rapid interception of large particles on the surface, the filter cake layer thickens, the pressure difference rises sharply, and it is prone to collapse in high-viscosity fluids, causing the filter layer to wrinkle and fail. To address this issue, we propose a multi-layered filter bag. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies mentioned in the background section by proposing a multi-layer filter bag.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-layer filter bag includes a filter bag body and a filter bag opening ring. The filter bag body is provided with a filter bag opening ring at its top end. The filter bag body includes a support layer, a main filter layer, and a pre-filter layer. The support layer, the main filter layer, and the pre-filter layer are composited into an integral structure from the inside to the outside by a hot-melt method. The support layer is a polypropylene spiral spring-shaped woven mesh. The pores on the outer surface of the main filter layer are arranged in an inverted trapezoidal shape, and the pore diameter decreases from the inside to the outside. The outer surface of the pre-filter layer is provided with a V-shaped pleated structure.

[0007] The three-layer composite structure can improve the overall mechanical strength and filtration accuracy of the filter bag. Then, it is fixed by hot-melt bonding, which can avoid the situation of adhesive contaminating the filtrate.

[0008] Preferably, the support layer is formed by interlacing warp spiral coils and weft connecting ribs to form a three-dimensional elastic skeleton, and the mesh shape of the support layer is diamond-shaped.

[0009] The helical spring structure of the support layer can provide anti-collapse support, thereby adapting to the filtration of high-viscosity fluids and extending the service life of the filter bag.

[0010] Preferably, the acute angle of the rhombus in the support layer is 60°, and the radial deformation rate of the support layer is 15%.

[0011] It can guide the liquid to penetrate vertically into the interior of the filter bag, reducing the lateral flow of the liquid and thus reducing turbulence.

[0012] Preferably, the innermost pore size of the main filter layer is 75 μm, the middle pore size of the main filter layer is 30 μm, and the outermost pore size of the main filter layer is 4 μm.

[0013] The gradient filtration of the main filter layer achieves the progressive interception of impurities, thereby reducing the clogging of the filter pores by impurities and making the flow stability of the liquid better.

[0014] Preferably, the pleat depth of the pre-filter layer is 5mm, the vertical height difference between the crest and trough of the pleat of the pre-filter layer is 6mm, the pleat density of the pre-filter layer is 20 pleats per 10cm, and the pleat slope of the pre-filter layer forms a 55° angle with the horizontal plane.

[0015] The pleated structure of the pre-filter layer can increase the effective filtration area and guide large particles of impurities to slide down along the pleats, thereby delaying clogging and increasing the overall service life of the filter bag.

[0016] Preferably, an installation groove is provided at the middle position of the filter bag opening ring, and the interior of the installation groove is filled with a sealing rubber ring, the cross-section of which is trapezoidal;

[0017] The sealing rubber ring can be press-fitted into the filter's groove, thus improving the sealing performance of the filter bag after installation.

[0018] Preferably, a conical flow guide is fixedly installed inside the filter bag body. A support rod is fixedly installed at the center of the conical flow guide. One end of the support rod is fixedly connected to the apex of the conical flow guide, and the other end of the support rod is fixedly connected to the bottom end of the filter bag body. Meanwhile, a swirl hole is provided on the outer surface of the conical flow guide, and the axis of the hole forms a 30° angle with the horizontal plane.

[0019] It can guide the liquid to rotate outside the conical guide shroud, and then, under the action of centrifugal force, make impurities gather in all directions, thus avoiding the accumulation of impurities at the bottom of the filter bag and causing blockage.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. This utility model uses a hot-melt method to combine the support layer, main filter layer, and pre-filter layer, which can avoid contaminating the filtrate by gluing and improve the overall strength of the filter bag, preventing the filter bag from collapsing during the filtration process.

[0022] 2. This utility model can improve the sealing of the filter bag opening ring during installation through the mounting groove. At the same time, after the liquid enters the bottom of the filter bag body, the conical guide shroud guides the liquid to rotate, thereby causing impurities to move to the periphery of the filter bag body under the action of centrifugal force, avoiding excessive accumulation of impurities at the bottom of the filter bag body and causing blockage. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of a multi-layer filter bag proposed in this utility model;

[0024] Figure 2 for Figure 1 A partial cross-sectional structural diagram of a medium-sized filter bag;

[0025] Figure 3 for Figure 1 Schematic diagram of the separated state of the opening ring and sealing rubber ring of the filter bag;

[0026] Figure 4 for Figure 1 A schematic diagram of the front cross-sectional structure of the filter bag body.

[0027] In the diagram: 1. Filter bag body; 11. Support layer; 12. Main filtration layer; 13. Pre-filtration layer; 2. Filter bag opening ring; 3. Mounting groove; 4. Sealing rubber ring; 5. Conical guide shroud; 6. Support rod. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] Reference Figures 1-4The illustration shows a multi-layer filter bag. The bag body 1 consists of three layers: a support layer 11, a main filter layer 12, and a pre-filter layer 13, arranged from the innermost to the outermost layer. The support layer 11 is a polypropylene spiral spring-shaped woven mesh, specifically formed by the interlacing of warp spiral coils and weft connecting ribs to create a three-dimensional elastic skeleton. The mesh has a rhomboid shape with an acute angle of 60°. The radial deformation rate of the support layer 11 is 15%. The overall substrate of the support layer 11 is modified polypropylene. The main filter layer 12 is made of copolyester, and the pores of the main filter layer 12 are arranged in an inverted trapezoidal shape, with the pore size decreasing from the inside out, and the innermost pore size being 75 μm. It can trap flaky metal shavings, the intermediate transition layer is 30μm, which can capture irregular silica gel debris, and the outermost pore size is 4μm, which can adsorb oxidized colloids of spherical particles, making the filtration effect better. The material of the pre-filter layer 13 is polyester needle-punched felt, and then a V-shaped pleated structure is set on the outer surface of the pre-filter layer 13. The pleat depth is 5mm, the vertical height difference between the crest and trough of the pleat is 6mm, and the pleat density is 20 pleats per 10cm. The pleat slope forms a 55° angle with the horizontal plane, and the support layer 11, the main filter layer 12 and the pre-filter layer 13 are composited into an integral structure by hot melting.

[0030] This embodiment provides supplementary explanations; please refer to [link / reference]. Figure 1 , Figure 3 and Figure 4 A filter bag opening ring 2 is fixedly installed at the top of the filter bag body 1. Then, an installation groove 3 is opened at the middle position of the filter bag opening ring 2. A sealing rubber ring 4 is filled inside the installation groove 3. The cross-section of the sealing rubber ring 4 is trapezoidal. Finally, a conical flow guide shroud 5 is fixedly installed inside the filter bag body 1. A support rod 6 is fixedly installed at the center position of the conical flow guide shroud 5, so that the support rod 6 can support the top of the conical flow guide shroud 5 and the bottom of the filter bag body 1. At the same time, a swirl hole is provided on the outer surface of the conical flow guide shroud 5, and the axis of the hole forms a 30° angle with the horizontal plane.

[0031] In this utility model, the installation, connection or setting methods of all the components mentioned above are common mechanical methods, and the specific structure, model and coefficient index of all the components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be described in detail.

[0032] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

[0033] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside, and vertical and horizontal" in the terminology only represent the orientation of the term in its conventional use or are common names understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, numerals such as "first," "second," and "third" do not represent specific quantities or orders, but are only used to distinguish names. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A multi-layer filter bag, comprising a filter bag body (1) and a filter bag opening ring (2), characterized in that, The filter bag body (1) is provided with a filter bag opening ring (2) at the top. The filter bag body (1) includes a support layer (11), a main filter layer (12) and a pre-filter layer (13). The support layer (11), the main filter layer (12) and the pre-filter layer (13) are combined into an integral structure from the inside to the outside by hot melting. The support layer (11) is a polypropylene spiral spring woven mesh. The holes on the outer surface of the main filter layer (12) are set in an inverted trapezoidal shape. The pore diameter of the holes decreases from the inside to the outside. The outer surface of the pre-filter layer (13) is set in a V-shaped pleated structure.

2. The multi-layer filter bag according to claim 1, characterized in that, The support layer (11) is formed by interlacing the warp spiral coil and the weft connecting rib to form a three-dimensional elastic skeleton, and the mesh shape of the support layer (11) is set in a rhombus shape.

3. A multi-layer filter bag according to claim 2, characterized in that, The acute angle of the rhombus of the support layer (11) is 60° and the radial deformation rate of the support layer (11) is 15%.

4. A multi-layer filter bag according to claim 1, characterized in that, The innermost pore size of the main filter layer (12) is 75 μm, the middle pore size of the main filter layer (12) is 30 μm, and the outermost pore size of the main filter layer (12) is 4 μm.

5. A multi-layer filter bag according to claim 1, characterized in that, The pre-filter layer (13) has a pleat depth of 5 mm, a vertical height difference of 6 mm between the peak and trough of the pleats, a pleat density of 20 pleats per 10 cm, and a pleat slope of 55° with the horizontal plane.

6. A multi-layer filter bag according to claim 1, characterized in that, An installation groove (3) is provided at the middle position of the filter bag opening ring (2), and the interior of the installation groove (3) is filled with a sealing rubber ring (4), the cross-section of the sealing rubber ring (4) is trapezoidal.

7. A multi-layer filter bag according to claim 1, characterized in that, A conical flow guide hood (5) is fixedly installed inside the filter bag body (1). A support rod (6) is fixedly installed at the center of the conical flow guide hood (5). One end of the support rod (6) is fixedly connected to the apex of the conical flow guide hood (5), and the other end of the support rod (6) is fixedly connected to the bottom end of the filter bag body (1). A swirling hole is provided on the outer surface of the conical flow guide hood (5), and the axis of the hole forms a 30° angle with the horizontal plane.

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