A multi-layer composite filter cloth

Abstract

The utility model belongs to filter cloth technical field, and disclose a kind of multilayer composite filter cloth, including filter cloth body, the outer surface of filter cloth body is equipped with reinforcing frame, reinforcing frame is along the outer peripheral edge of filter cloth body and is set, and the height of reinforcing frame is higher than the thickness of filter cloth body, filter cloth body is by multilayer structure, and filter cloth body is by from the face of meeting flow to the face of discharge in order coarse filter layer, middle filter layer, fine filter layer and support layer composition, coarse filter layer adopts polyester fiber needle punching felt material, and it is formed by polyester staple fibre interwoven and has macroporous loose structure by needle punching process, the face of meeting flow of coarse filter layer is equipped with several evenly distributed protrusions, the utility model is by setting filter cloth body, under the action of realizing accurate interception respectively to large particle, middle particle and fine particle in different levels, significantly improve the filtration efficiency to complex impurity system, reduce the risk of single filter layer blockage.

Description

Technical Field

[0001] This utility model belongs to the field of filter cloth technology, specifically a multi-layer composite filter cloth. Background Technology

[0002] In numerous fields such as industrial production, environmental protection, and water purification, filtration technology has always played an indispensable role as a key means of achieving solid-liquid separation, gas-solid separation, or substance purification. As various industries continue to increase their requirements for filtration efficiency, separation accuracy, durability, and applicability, single-structure filter materials are gradually facing the challenge of balancing high-efficiency filtration with long-term stable operation when dealing with filter media with complex compositions and diverse particle distributions.

[0003] Existing filter cloths are mostly single-layer or simple double-layer structures, lacking sophisticated graded filtration design, resulting in low interception efficiency for impurities of different particle sizes, and making it difficult to balance filtration accuracy and flux stability.

[0004] Therefore, a multi-layer composite filter cloth is proposed to address the above problems. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides a multi-layer composite filter cloth, which has the advantages of significantly improving the filtration efficiency for complex impurity systems, reducing the risk of clogging of a single filter layer, extending the filtration cycle, and maintaining a stable pore morphology of the multi-layer filter structure under high pressure conditions, thus ensuring the continuous effectiveness of the graded filtration function.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-layer composite filter cloth, comprising a filter cloth body, wherein a reinforcing frame is provided on the outer surface of the filter cloth body, the reinforcing frame is provided along the outer peripheral edge of the filter cloth body, and the height of the reinforcing frame is greater than the thickness of the filter cloth body, the filter cloth body is composed of a multi-layer structure, and the filter cloth body is composed of a coarse filter layer, a medium filter layer, a fine filter layer and a support layer in sequence from the flow-facing surface to the flow-out surface.

[0007] Preferably, the coarse filter layer is made of polyester fiber needle-punched felt, which is formed by interlacing short polyester fibers through a needle-punching process to create a loose structure with large pores.

[0008] Preferably, the flow-facing surface of the coarse filter layer has a plurality of evenly distributed protrusions, which are integrally formed with the coarse filter layer. These protrusions can alter the flow path of the fluid on the surface of the coarse filter layer, reducing localized impurity accumulation.

[0009] Preferably, the protrusion is hemispherical.

[0010] Preferably, the middle filter layer is made of polypropylene meltblown nonwoven fabric, which is made of polypropylene resin through a meltblown process, and the fibers are randomly arranged to form a filter structure with medium pore size.

[0011] Preferably, the fine filtration layer is made of polyethersulfone nanofiber membrane material, which is prepared by electrospinning process, and the fiber diameter is small and forms a dense microporous structure.

[0012] Preferably, the support layer is made of glass fiber mesh fabric, which is woven from glass fiber filaments to form a skeleton structure with a regular mesh.

[0013] Preferably, the support layer has a mesh reinforcing rib on the side away from the fine filter layer, and the reinforcing rib is integrally formed with the reinforcing frame.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. By setting up a filter cloth body, this utility model can accurately intercept large, medium and fine particles at different levels, which can significantly improve the filtration efficiency of complex impurity systems and reduce the risk of clogging of a single filter layer.

[0016] 2. By setting up a reinforced frame and reinforcing ribs, this utility model, with the synergistic effect of the frame strengthening the edge structure and the reinforcing ribs improving the bottom support strength, not only avoids edge damage or interlayer separation of the filter cloth during installation and use, but also ensures that the multi-layer filter structure maintains a stable pore shape under high pressure conditions by improving the overall structural rigidity, thus ensuring the continuous effectiveness of the graded filtration function. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is an exploded view of the coarse filter layer, medium filter layer, fine filter layer and support layer structure of this utility model;

[0019] Figure 3 This utility model Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0020] Figure 4 This is a schematic diagram of the reinforced frame and reinforcing rib structure of this utility model.

[0021] In the diagram: 1. Reinforced border; 11. Reinforcing rib;

[0022] 2. Filter cloth body; 21. Coarse filter layer; 211. Protrusions;

[0023] 22. Medium filtration layer; 23. Fine filtration layer; 24. Support layer. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figures 1 to 4 As shown, this utility model provides a multi-layer composite filter cloth, including a filter cloth body 2. The outer surface of the filter cloth body 2 is provided with a reinforcing frame 1. The reinforcing frame 1 is set along the outer periphery of the filter cloth body 2, and the height of the reinforcing frame 1 is higher than the thickness of the filter cloth body 2. The filter cloth body 2 is composed of a multi-layer structure, and the filter cloth body 2 is composed of a coarse filter layer 21, a medium filter layer 22, a fine filter layer 23 and a support layer 24 from the flow-facing surface to the flow-out surface. Through the combination design of the multi-layer structure and the reinforcing frame 1, the graded filtration function is realized, and the overall structural stability is enhanced by the frame, which solves the problems of low filtration efficiency and easy edge damage of traditional filter cloth with a single structure.

[0026] Specifically, the coarse filter layer 21 is made of polyester fiber needle-punched felt, which is formed by interlacing short polyester fibers through a needle-punching process to create a loose structure with large pores. The loose structure of the polyester fiber needle-punched felt can efficiently intercept large particulate impurities in the fluid. At the same time, the polyester material is wear-resistant and acid and alkali resistant, which extends the service life of the coarse filter layer 21.

[0027] like Figures 1 to 4 As shown, the coarse filter layer 21 has several evenly distributed protrusions 211 on its flow-facing surface. The protrusions 211 are integrally formed with the coarse filter layer 21. The protrusions 211 can change the flow path of the fluid on the surface of the coarse filter layer 21, reduce the accumulation of local impurities, and the structure of the protrusions 211 can disperse the impact force of the fluid, prevent impurities from accumulating in local areas, maintain the unobstructed flow of the coarse filter layer 21, and ensure stable filtration flux.

[0028] Furthermore, the protrusion 211 is hemispherical. The hemispherical protrusion 211 has no sharp edges, which can effectively change the fluid path, reduce the resistance to the fluid, and prevent damage to the protrusion 211 due to stress concentration.

[0029] like Figures 1 to 4 As shown, the middle filter layer 22 is made of polypropylene meltblown nonwoven fabric, which is made of polypropylene resin through meltblowing process. The fibers are randomly arranged to form a medium pore size filter structure. The medium pore size structure of polypropylene meltblown nonwoven fabric can accurately intercept medium particulate impurities that are not filtered by the coarse filter layer 21, and the randomly arranged fibers form tortuous flow channels, which improves the probability of particle capture.

[0030] It is worth noting that the fine filter layer 23 is made of polyethersulfone nanofiber membrane material and is prepared by electrospinning process. The fiber diameter is small and forms a dense microporous structure. The dense microporous structure of polyethersulfone nanofiber membrane can efficiently filter fine particles. The electrospinning process makes the fiber diameter uniform, ensuring the filtration accuracy and consistency of fine filter layer 23.

[0031] like Figures 1 to 4 As shown, the support layer 24 is made of glass fiber mesh cloth, which is woven from glass fiber filaments to form a skeleton structure with a regular grid. The regular grid structure of the glass fiber mesh cloth provides stable support for the upper filter layer and resists deformation caused by filtration pressure. At the same time, the grid structure does not obstruct the flow of fluid and ensures smooth filtration.

[0032] It is worth emphasizing that the support layer 24 is provided with a mesh reinforcing rib 11 on the side away from the fine filter layer 23. The reinforcing rib 11 is integrally formed with the reinforcing frame 1, so that the force of the support layer 24 is transferred to the reinforcing frame 1 through the reinforcing rib 11, forming an overall force system, which significantly improves the tensile and deformation resistance of the filter cloth, and is especially suitable for high-pressure filtration scenarios.

[0033] Working principle and process: The fluid to be filtered enters the coarse filter layer 21 from the inlet side. Large particles of impurities are intercepted by the large pore structure of the coarse filter layer 21, and the hemispherical protrusions 211 guide the fluid to be evenly distributed. The remaining fluid enters the middle filter layer 22, where medium-sized particles of impurities are captured by the medium-sized pore structure of the meltblown nonwoven fabric. The fluid then flows through the fine filter layer 23, where fine particles are intercepted by the dense micropores of the nanofiber membrane. Finally, the purified fluid flows out through the support layer 24. The reinforced frame 1 and the reinforcing ribs 11 work together to provide stable support for the multi-layer filtration structure, avoiding structural deformation or edge damage caused by pressure changes during filtration, and ensuring the continuous effectiveness of the graded filtration function.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-layer composite filter cloth, comprising a filter cloth body (2), characterized in that: The outer surface of the filter cloth body (2) is provided with a reinforcing frame (1). The reinforcing frame (1) is set along the outer periphery of the filter cloth body (2), and the height of the reinforcing frame (1) is higher than the thickness of the filter cloth body (2). The filter cloth body (2) is composed of a multi-layer structure, and the filter cloth body (2) is composed of a coarse filter layer (21), a medium filter layer (22), a fine filter layer (23), and a support layer (24) from the flow-facing surface to the flow-out surface.

2. The multilayer composite filter cloth according to claim 1, characterized in that: The coarse filter layer (21) is made of polyester fiber needle-punched felt, which is formed by interlacing short polyester fibers through a needle-punching process to create a loose structure with large pores.

3. The multilayer composite filter cloth according to claim 2, characterized in that: The coarse filter layer (21) has several uniformly distributed protrusions (211) on its flow-facing surface. The protrusions (211) are integrally formed with the coarse filter layer (21). The protrusions (211) can change the flow path of the fluid on the surface of the coarse filter layer (21) and reduce the local accumulation of impurities.

4. The multilayer composite filter cloth according to claim 3, characterized in that: The protrusion (211) is hemispherical.

5. The multilayer composite filter cloth according to claim 1, characterized in that: The middle filter layer (22) is made of polypropylene meltblown nonwoven fabric, which is made of polypropylene resin through meltblowing process. The fibers are randomly arranged to form a medium pore size filter structure.

6. The multilayer composite filter cloth according to claim 1, characterized in that: The fine filter layer (23) is made of polyethersulfone nanofiber membrane material and is prepared by electrospinning process. The fiber diameter is small and forms a dense microporous structure.

7. The multilayer composite filter cloth according to claim 1, characterized in that: The support layer (24) is made of glass fiber mesh fabric, which is woven from glass fiber filaments to form a skeleton structure with a regular mesh.

8. The multilayer composite filter cloth according to claim 7, characterized in that: The support layer (24) is provided with a mesh reinforcing rib (11) on the side away from the fine filter layer (23), and the reinforcing rib (11) is integrally formed with the reinforcing frame (1).

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