A multi-material combined co-filtration equipment

Abstract

The present invention belongs to the field of filtration technology, and discloses a multi-material combined co-filtration device, the co-filtration device includes an inlet chamber, a filter chamber and a waste discharge chamber arranged in sequence from top to bottom, and also includes: filter material, whose array is arranged in the filter chamber; a backwash box, which is sleeved on the outer periphery of the filter material for limiting the backwashing area; an air inlet pipe, which is connected to the backwash box for injecting high-pressure gas therein to backwash the filter material; a drive module, which is transmission-connected to the backwash box for driving the backwash box to move vertically. The present application combines a variety of filter materials so that most of the ultra-fine, ultra-sticky or easily deformed solid fine particles in liquid-solid or gas-solid mixed materials are first dispersed and blocked in the filter material layer of the multi-layer auxiliary filter medium outside the main filter medium, and will not all be trapped on the surface of the main filter medium. In this way, under low pressure difference conditions, the entire filtration equipment still maintains a relatively high filtration rate.

Description

Technical Field

[0001] The invention belongs to the technical field of filtration, and in particular relates to a multi-material combined co-filtration device. Background Art

[0002] With the development of intelligent industrial production, humans are facing more and more challenges while enjoying convenience. Huge energy consumption and worsening environmental damage are among the many challenges. One of the major reasons for this is the lack of development of "solid-liquid mixture" separation technology in industrial production, and the lack of more efficient separation methods.

[0003] For example, the particle size of solid particles in the separated solid-liquid mixture is getting finer and finer, from micron level to submicron level or even nanometer level; the separated solid particles are no longer just rigid amorphous particles, a large number of particles have high surface viscosity, easy to stick together and difficult to separate; the separated solid particles are non-rigid and changeable, and these changeable particle layers can easily form a non-porous solid film that is difficult for liquid to penetrate, making subsequent liquid-solid separation impossible; the separated solid is not granular, but a loosely aggregated flocculent group of finer solid particles. These aggregates can also easily form a solid film with great resistance and difficult for liquid to penetrate on the surface of the filter material. In the environment where industrial production is in the primary stage, the above four materials are basically not separated, and even directly discharged into rivers, lakes and other places with wastewater. At present, industrial development has entered an advanced stage, and the above materials must be effectively separated, and unseparated discharge is no longer allowed. The separation technology currently used is more common with membrane separation, but due to the continuity of industrial production and frequent chemical regeneration, the cost consumption is also huge.

[0004] In order to overcome the above-mentioned solid-liquid separation defects in industrial production, the present application proposes a multi-material combination co-filtration equipment to solve the above-mentioned problems. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a multi-material combination co-filtration device.

[0006] To achieve the above object, the present invention provides the following technical solution: a multi-material combined co-filtration device, the co-filtration device comprises an inlet chamber, a filter chamber and a waste discharge chamber arranged in sequence from top to bottom, and further comprises:

[0007] A filter material, an array of which is disposed in the filter cavity;

[0008] A backwash box, which is sleeved on the periphery of the filter material to limit the backwashing area;

[0009] An air inlet pipe connected to the backwash box is used to inject high-pressure gas into the backwash box to backwash the filter material;

[0010] A driving module, which is connected to the backwash box for driving the backwash box to move vertically;

[0011] The inlet cavity is provided with a liquid inlet pipe port, the waste discharge cavity is provided with a liquid discharge pipe port, and the bottom of the waste discharge cavity is connected with a waste discharge pipe port which is communicated with the inner cavity of each filter material.

[0012] Preferably, the filter material comprises a filter material body and clamps fixedly mounted on the outside of the filter material at equal distances, and when the backwash box backwashes the filter material, the filter material body between two adjacent clamps is included therein for backwashing.

[0013] Preferably, the filter material body comprises a main filter material, an auxiliary filter material 1 and an auxiliary filter material 2 which are sequentially sleeved from the outside to the inside, the auxiliary filter material 1 is arranged in equal length sections and is evenly and thickly covered on the inner surface of the main filter material along the axis direction of the main filter material, two adjacent groups of auxiliary filter materials 1 are overlapped end to end, and the auxiliary filter material 2 cooperates with the main filter material to cover all the auxiliary filter materials 1 in the middle;

[0014] The clamp is clamped and pressed onto the main filter material at a horizontal position where the two auxiliary filter materials overlap end to end.

[0015] Preferably, the auxiliary filter material 1 is composed of shorter fiber bundles, the fiber bundle layer thickness is 1-2 mm, and the fiber bundle length is 20-30 mm;

[0016] The diameter of each strand is 0.1-0.15 mm;

[0017] The diameter of each fiber strand is not exactly the same.

[0018] Preferably, the mesh number of the auxiliary filter material 2 is 200-400 meshes, and the auxiliary filter material 2 is composed of 3-4 layers of filter screens of the same specifications stacked together.

[0019] Preferably, the backwash box includes a guide ring that runs through the upper and lower sides of the backwash box body, and the guide ring is set on the air inlet pipe to connect the inner cavity of the backwash box and the air inlet pipe;

[0020] The backwash box also includes a plurality of guide slip rings 2 that penetrate the upper and lower parts of the backwash box body. The guide slip rings 1 correspond to the filter materials one by one and are sleeved on the outside of the filter materials.

[0021] Preferably, the air inlet pipe comprises a pipe body, spacer rings equidistantly arranged on the outer periphery of the pipe body, and the space between two adjacent spacer rings corresponds to one layer of auxiliary filter material;

[0022] The pipe bodies of two adjacent spacer rings are provided with air inlets for communicating with the inner cavity of the backwash box.

[0023] Preferably, the air inlet comprises a fixing nail fixedly mounted on the air inlet and an elastic sheet movably sleeved on the fixing nail, and the elastic sheet is provided with a vertical groove to cooperate with the fixing nail;

[0024] The middle part of the elastic sheet arches outwardly along the radial direction of the tube body and extends to a vertical sliding track of the guide ring. A spacer ring is arranged on the inner side of the middle part of the elastic sheet for sealing or opening the inner opening of the air inlet.

[0025] Preferably, the vertical projection of the wing plate of the first guide slip ring coincides with the vertical projection of the middle arch end of the elastic sheet, and a connecting slot is provided on the second guide slip ring.

[0026] Preferably, the driving module comprises a driving machine arranged at the top of the inlet cavity, a lead screw arranged in the filter cavity and drivingly connected to the driving machine, and a slider fixed on the backwash box, wherein the slider is slidably connected to the lead screw.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention injects the water body to be separated into the inlet cavity from the liquid inlet pipe mouth, and the water body is filtered by the inlet cavity to form a filter cake on the inner wall of the filter material. When the filtration resistance exceeds the threshold value and greatly affects the filtration efficiency, the backwash box is activated to blow and wash the filter material. The backwash box is driven to move along the length direction of the filter material to backwash the filter material and fall off the filter cake adhering to its inner wall. The inner cavity of the filter material is connected to the waste discharge cavity, and the fallen filter cake is discharged to the external environment through the waste discharge pipe mouth for unified collection and treatment. The present application also combines a variety of filter materials, so that the ultra-fine, ultra-sticky or easily deformable solid fine particles in the liquid-solid or gas-solid mixed material will not be completely trapped on the surface of the main filter medium, forming a filter cake layer with great resistance, causing the filtration speed to drop rapidly. Most of them are first dispersed and blocked in the filter material layer of the multi-layer auxiliary filter medium outside the main filter medium, and will not be completely trapped on the surface of the main filter medium. In this way, under low pressure difference conditions, the entire filtration device still maintains a high filtration rate.

[0029] The filter material is backwashed in sections through the backwash box, and each layer of filter material is blown and washed in a targeted manner. A high blow-washing pressure difference is maintained, the filter cake is efficiently removed and finally discharged to the external environment in a uniform manner, which effectively improves the blow-washing efficiency and the use efficiency of the filter material. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 is an internal cross-sectional view of the present invention;

[0032] Figure 3 It is a schematic diagram of the filter material configuration inside the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the inlet cavity and the filter cavity of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure of a single filter material of the present invention;

[0035] Figure 6 It is a schematic diagram of the air intake pipe of the present invention;

[0036] Figure 7 For the present invention Figure 6 A magnified schematic diagram of part A;

[0037] Figure 8 It is a structural schematic diagram of the guide slip ring 1 and the air intake pipe of the present invention;

[0038] Fig. 9 For the present invention Figure 8 A magnified schematic diagram of part B;

[0039] Fig.10 It is a cross-sectional schematic diagram of the filter material body of the present invention.

[0040] In the figure: 101, inlet cavity; 102, filter cavity; 103, waste discharge cavity; 104, liquid inlet pipe outlet; 105, liquid discharge pipe outlet; 106, waste discharge pipe outlet; 201, driving machine; 202, lead screw; 203, slider; 300, backwash box; 301, guide slip ring 1; 302, guide slip ring 2; 400, filter material; 401, filter material body; 4011, main filter material; 4012, auxiliary filter material 1; 4013, auxiliary filter material 2; 402, clamp; 500, air inlet pipe; 501, pipe body; 502, air inlet; 503, elastic sheet; 504, vertical groove; 505, fixing nail; 506, spacer ring; 507, valve plate. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figures 1 to 10 As shown, the present invention provides a multi-material combined co-filtration device, the co-filtration device includes an inlet chamber 101, a filter chamber 102 and a waste discharge chamber 103 arranged in sequence from top to bottom, and also includes:

[0043] Filter material 400, whose array is disposed in the filter cavity 102;

[0044] The backwash box 300 is sleeved on the outer periphery of the filter material 400 to limit the backwashing area;

[0045] An air inlet pipe 500, which is connected to the backwash box 300 and is used to inject high-pressure gas therein to backwash the filter material 400;

[0046] A driving module, which is in transmission connection with the backwash box 300 and is used to drive the backwash box 300 to move vertically;

[0047] The inlet cavity 101 is provided with a liquid inlet port 104 , the waste discharge cavity 103 is provided with a liquid discharge port 105 , and the bottom of the waste discharge cavity 103 is connected with a waste discharge port 106 which is in communication with the inner cavity of each filter material 400 .

[0048] The water to be separated is injected into the inlet cavity 101 from the liquid inlet nozzle 104, and is diverted to each filter material 400 through the inlet cavity 101 to filter the water, forming a filter cake on the inner wall of the filter material 400. When the filtration resistance exceeds the threshold value and greatly affects the filtration efficiency, the backwash box 300 is activated to purge the filter material 400. The driver 201 drives the backwash box 300 to move along the length direction of the filter material 400, backwashes the filter material 400, and removes the filter cake adhered to its inner wall. The inner cavity of the filter material 400 is connected to the waste discharge cavity 103, and the fallen filter cake is discharged to the external environment through the waste discharge nozzle 106 for unified collection and treatment.

[0049] like Figure 2-Figure 5 As shown, the filter material 400 includes a filter material body 401 and clamps 402 fixedly mounted on the outside of the filter material 401 at equal intervals. When the backwash box 300 backwashes the filter material 400, the filter material body 401 between two adjacent clamps 402 is included therein for backwashing.

[0050] The clamps 402 form evenly spaced sections on the surface of the filter material body 401. The backwash box 300 cooperates with the clamps 402 to perform targeted flushing on the section only between two adjacent clamps 402. The backwash box 300 moves vertically to the clamps 402 of each section to form an interference fit with it, and the backwash liquid or gas-liquid mixture in the backwash box 300 backwashes it. The inner wall of the filter material body 401 is flushed down, and the backwash box 300 moves vertically one by one to perform section-by-section flushing at a time to ensure the flushing pressure and cleaning effectiveness. When the filter material body 401 is flushed as a whole, the area is large and the pressure is insufficient, resulting in insufficient flushing pressure, and the filter cake cannot be effectively removed, especially the sticky filter cake is inconvenient to blow off.

[0051] like Figure 5 and Fig.10As shown, the filter material body 401 includes a main filter material 4011, an auxiliary filter material 1 4012 and an auxiliary filter material 2 4013 which are sequentially sleeved from the outside to the inside, the auxiliary filter material 1 4012 is arranged in equal length sections and is evenly and thickly attached to the inner surface of the main filter material 4011 along the axis direction of the main filter material 4011, and two adjacent groups of auxiliary filter materials 1 4012 are overlapped end to end, and the auxiliary filter material 2 4013 cooperates with the main filter material 4011 to cover all the auxiliary filter materials 1 4012 in the middle;

[0052] The clamp 402 is clamped and pressed onto the main filter material 4011 at a horizontal position where the two auxiliary filter materials 4012 overlap end to end.

[0053] The main filter material 4011 is a sub-rigid microporous filter material (sub-rigid polymer sintered filter material or sub-rigid non-sintered microporous filter material), which can filter 100% of solid particles with a particle diameter of 0.1-0.5 microns in one filtration. Auxiliary filter material 1 4012 and auxiliary filter material 2 4013 are auxiliary filter materials arranged on the main filter material 4011, serving as pre-filtration of the main filter material 4011. The position of the hoop 402 is horizontal with the head and tail overlap position of the auxiliary filter material 1 4012 inside the main filter material 4011, and is used to separate it externally. It is convenient to perform backwashing on the single area in the subsequent backwashing.

[0054] like Fig.10 As shown, the auxiliary filter material 4012 is composed of shorter fiber bundles, the fiber bundle layer thickness is 1-2mm, and the fiber bundle length is 20-30mm;

[0055] The diameter of each strand is 0.1-0.15 mm;

[0056] The diameter of each fiber strand is not exactly the same.

[0057] All fiber bundles are placed in parallel without crossing. One end of the fiber is fixed on the main filter material 4011 and the other end is free. The free end is freely overlapped with the fixed section of the next fiber bundle layer and finally compressed by the auxiliary filter material 2 4013. The auxiliary filter material 1 4012 serves as a pretreatment layer for the main filter material 4011, intercepting some extremely fine and sticky solid particles, while the main filter material intercepts less extremely fine and sticky solid particles. At this point, all the extremely fine and sticky solid particles are completely structured on the surface of the filter material to form a thin filter cake layer.

[0058] like Fig.10 As shown, the mesh number of the auxiliary filter material 4013 is 200-400 meshes, and the auxiliary filter material 4013 is composed of 3-4 layers of filter screens of the same specifications stacked together.

[0059] The fiber diameter of the mesh cloth is between 0.1-0.15mm, and there is a 0.3mm coarse convex point at the intersection of the longitudinal line and the latitude line of the mesh cloth, which plays a filtering aid role in the filtration. The mesh cloth is supported on the inner side of the filter material main body 401 by a plastic cylindrical plastic frame and attached to the auxiliary filter material 1 4012. The auxiliary filter material 2 4013 cooperates with the auxiliary filter material 1 4012 as a pre-filtration treatment of the main filter material. It also plays a resistance role against the sticky filter cake layer and the floc filter cake layer.

[0060] like Figure 4-Figure 6 As shown, the backwash box 300 includes a guide ring 301 that penetrates the upper and lower parts of the backwash box 300 body, and the guide ring 301 is sleeved on the air inlet pipe 500 to connect the inner cavity of the backwash box 300 and the air inlet pipe 500;

[0061] The backwash box 300 further includes a plurality of guide rings 302 penetrating the upper and lower parts of the backwash box 300 body. The guide rings 301 correspond to the filter materials 400 one by one and are sleeved on the outside of the filter materials 400 .

[0062] The guide ring 1 301 and the guide ring 2 302 are respectively sleeved on the air inlet pipe 500 and the filter material 400. Since the air inlet pipe 500 and the filter material 400 are designed in the same paragraph style, the guide ring 1 301 and the guide ring 2 302 act on a layer of the air inlet pipe 500 and the filter material 400 at a corresponding height, respectively. The guide ring 1 301 and the guide ring 2 302 are designed to be connected inside and outside, and can conduct the backwash airflow and the solid-liquid mixed backwash fluid to the filter material 400. The guide ring 1 301 and the guide ring 2 302 cooperate closely and tightly with the air inlet pipe 500 and the filter material 400 during backwashing.

[0063] When the backwash box 300 performs backwashing at different heights, each of the heights corresponds to the position of a layer of auxiliary filter material 4012.

[0064] like Figure 6-Figure 9 As shown, the air intake pipe 500 includes a pipe body 501, and spacer rings 506 are equidistantly arranged on the outer periphery of the pipe body 501, and the space between two adjacent spacer rings 506 corresponds to a layer of auxiliary filter material 4012;

[0065] The tube bodies 501 of two adjacent spacer rings 506 are provided with air inlets 502 for communicating with the inner cavity of the backwash box 300 .

[0066] A layer of auxiliary filter material 4012 corresponds to two adjacent spacer rings 506, and an interference fit is formed between the spacer ring 506 and the guide ring 301 to prevent the backwash fluid from overflowing from the edge. The air inlet 502 is set between a layer of spacer rings 506, and is used to conduct the backwash air flow or solid-liquid mixture therein when the guide ring 301 slides onto the corresponding layer of spacer rings 506. After the backwash fluid enters the inner cavity of the backwash box 300, it backwashes the filter material body 401 of the corresponding section to remove the highly viscous solid small particle waste or other rigid small particle waste thereon.

[0067] like Figure 7-Figure 9 As shown, the air inlet 502 includes a fixing nail 505 fixedly mounted on the air inlet 502 and an elastic sheet 503 movably sleeved on the fixing nail 505, and a vertical groove 504 is provided on the elastic sheet 503 to cooperate with the fixing nail 505;

[0068] The middle part of the elastic sheet 503 arches radially outward along the tube body 501 and extends to the track of the vertical sliding of the guide ring 301. A spacer ring 506 is arranged on the inner side of the middle part of the elastic sheet 503 to block or open the inner opening of the air inlet 502.

[0069] In the initial state, the middle of the elastic sheet 503 arches outward and extends to the vertical sliding track of the guide ring 301. In this state, the valve plate 507 fits the inner opening of the air inlet 502 to block the air inlet 502. The upper and lower ends of the elastic sheet 503 are movably connected to the fixing nails 505, and the vertical grooves 504 opened on both ends provide space for the two ends of the elastic sheet 503 to slide vertically upward. When the guide ring 301 moves vertically, it presses on the elastic sheet 503 to make it yield and deform inward, so that Fig. 9 As shown, the elastic sheet 503 is pressed flat by the guide ring 301, and the valve plate 507 retreats backward to open the opening of the air inlet 502, allowing the air flow or solid-liquid mixed foam in the tube body 501 to enter the backwash box 300, thereby backwashing the filter material body 401.

[0070] like Figure 6 and Figure 7 As shown, the vertical projection of the wing plate of the first guide slip ring 301 coincides with the vertical projection of the middle arch end of the elastic sheet 503, and a connecting slot is provided on the second guide slip ring 302.

[0071] When the guide slip ring 1 301 moves vertically, it passes through the position where the middle part of the elastic sheet 503 is arched, pressing it downward. The width of the guide slip ring 1 301 is less than or equal to the width of the elastic sheet 503, and it does not block the opening of the air inlet 502, and the opening of the air inlet 502 can be connected normally. The guide slip ring 2 302 is tightly attached to the two adjacent clamps 402, and cooperates with the filter material body 401 to form a cavity. The connecting slot of the guide slip ring 2 302 connects the above-mentioned cavity with the inner cavity of the backwash box 300, so that the high-pressure gas or gas-liquid mixed fluid in the tube body 501 enters the above-mentioned cavity through the air inlet 502, the inner cavity of the backwash box 300 and the connecting slot on the guide slip ring 2 302, and presses the fluid into the filter material body 401 for section backwashing.

[0072] like Figure 1-Figure 3 As shown, the driving module includes a driving machine 201 arranged at the top of the inlet chamber 101, a lead screw 202 arranged in the filter chamber 102 and drivingly connected to the driving machine 201, and a slider 203 fixed on the backwash box 300, and the slider 203 is slidably connected to the lead screw 202.

[0073] The driving machine 201 is composed of a motor, a turbine mechanism, a reducer and other mechanisms, which is used to drive the lead screw 202 to drive the backwash box 300 to move vertically. The backwash box 300 is driven to move a fixed distance once, so that the backwash box 300 covers a section of the filter material body 401 between adjacent clamps 402 on the filter material 400 for backwashing.

[0074] The working principle and use process of the present invention:

[0075] The water to be separated is injected into the inlet cavity 101 from the liquid inlet nozzle 104, and is diverted to each filter material 400 through the inlet cavity 101 to filter the water, forming a filter cake on the inner wall of the filter material 400. When the filtration resistance exceeds the threshold value and greatly affects the filtration efficiency, the backwash box 300 is activated to purge the filter material 400. The driver 201 drives the backwash box 300 to move along the length direction of the filter material 400, backwashes the filter material 400, and removes the filter cake adhered to its inner wall. The inner cavity of the filter material 400 is connected to the waste discharge cavity 103, and the fallen filter cake is discharged to the external environment through the waste discharge nozzle 106 for unified collection and treatment. During the downward movement of the backwash box 300, the elastic sheet 503 is initially arched outward in the middle and extends to the vertical sliding track of the guide ring 301. In this state, the valve plate 507 fits the inner end opening of the air inlet 502 to block the air inlet 502. The upper and lower ends of the elastic sheet 503 are movably connected to the fixing nail 505, and the vertical grooves 504 opened on both ends provide space for the two ends of the elastic sheet 503 to slide downward in the vertical direction. When the guide ring 301 moves vertically, it presses on the elastic sheet 503 to make it yield and deform inward. The elastic sheet 503 is pressed flat by the guide ring 301, and the valve plate 507 retreats backward to open the opening of the air inlet 502, so that the airflow or solid-liquid mixed foam in the tube body 501 enters the backwash box 300, thereby backwashing the filter material body 401.

[0076] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0077] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-material combined co-filtration device, characterized in that: The co-filtration device comprises an inlet chamber (101), a filter chamber (102) and a waste discharge chamber (103) which are arranged in sequence from top to bottom, and further comprises: Filter materials (400), whose array is arranged in the filter cavity (102); A backwash box (300) is sleeved on the outer periphery of the filter material (400) and is used to limit the backwashing area; An air inlet pipe (500) is connected to the backwash box (300) and is used to inject high-pressure gas therein to backwash the filter material (400); A driving module, which is drivingly connected to the backwash box (300) and is used to drive the backwash box (300) to move vertically; The inlet cavity (101) is provided with a liquid inlet pipe opening (104), the waste discharge cavity (103) is provided with a liquid discharge pipe opening (105), and the bottom of the waste discharge cavity (103) is connected with a waste discharge pipe opening (106) which is in communication with the inner cavity of each filter material (400); The filter material (400) comprises a filter material body (401) and clamps (402) fixedly mounted on the outside of the filter material body at equal distances, and when the backwash box (300) backwashes the filter material (400), the filter material body (401) between two adjacent clamps (402) is included therein for backwashing; The backwash box (300) comprises a guide ring (301) that penetrates the upper and lower sides of the backwash box (300) body, and the guide ring (301) is sleeved on the air inlet pipe (500) to connect the inner cavity of the backwash box (300) and the air inlet pipe (500); The backwash box (300) further comprises a plurality of guide rings (302) penetrating the upper and lower parts of the backwash box (300) body, and the guide rings (301) correspond to the filter materials (400) one by one and are sleeved on the outside of the filter materials (400); The air intake pipe (500) comprises a pipe body (501), spacer rings (506) arranged at equal intervals on the outer periphery of the pipe body (501), and a space between two adjacent spacer rings (506) corresponding to a layer of auxiliary filter material one (4012); The tube bodies (501) of two adjacent spacer rings (506) are provided with air inlets (502) for communicating with the inner cavity of the backwash box (300); The air inlet (502) comprises a fixing nail (505) fixedly mounted on the air inlet (502) and an elastic sheet (503) movably sleeved on the fixing nail (505); the elastic sheet (503) is provided with a vertical groove (504) cooperating with the fixing nail (505); The middle part of the elastic sheet (503) arches outward radially along the tube body (501) and extends to the track of the vertical sliding of the guide ring (301), and a spacer ring (506) is provided on the inner side of the middle part of the elastic sheet (503) for sealing or opening the inner opening of the air inlet (502); The vertical projection of the wing plate of the first guide slip ring (301) coincides with the vertical projection of the middle arch end of the elastic sheet (503), and a connecting slot is provided on the second guide slip ring (302).

2. A multi-material combined co-filtration device according to claim 1, characterized in that: The filter material body (401) comprises a main filter material (4011), an auxiliary filter material 1 (4012) and an auxiliary filter material 2 (4013) which are sequentially sleeved from the outside to the inside, the auxiliary filter material 1 (4012) being arranged in equal length sections and evenly and thickly attached to the inner surface of the main filter material (4011) along the axis direction of the main filter material (4011), two adjacent groups of auxiliary filter materials 1 (4012) being overlapped end to end, and the auxiliary filter material 2 (4013) cooperates with the main filter material (4011) to cover all the auxiliary filter materials 1 (4012) in the middle; The clamp (402) is clamped and pressed onto the main filter material (4011) at a horizontal position where the two auxiliary filter materials (4012) overlap end to end.

3. A multi-material combined co-filtration device according to claim 2, characterized in that: The auxiliary filter material 1 (4012) is composed of shorter fiber bundles, the fiber bundle layer thickness is 1-2mm, and the fiber bundle length is 20-30mm; The diameter of each strand is 0.1-0.15 mm; The diameter of each fiber strand is not exactly the same.

4. The multi-material combined co-filtration device according to claim 3, characterized in that: The mesh number of the auxiliary filter material 2 (4013) is 200-400 meshes, and the auxiliary filter material 2 (4013) is composed of 3-4 layers of filter screens of the same specifications stacked together.

5. The multi-material combined co-filtration device according to claim 1, characterized in that: The driving module comprises a driving machine (201) arranged at the top of the inlet chamber (101), a lead screw (202) arranged in the filter chamber (102) and drivingly connected to the driving machine (201), and a sliding block (203) fixedly mounted on the backwash box (300), wherein the sliding block (203) is slidably connected to the lead screw (202).

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