Coated chemical filter

Abstract

The application discloses a coated chemical filter screen and relates to the technical field of chemical filter screens.The coated chemical filter screen comprises a top cover and a bottom plate, a cylindrical secondary filter screen is fixed between the top cover and the bottom plate, the top cover is further provided with a primary filter screen which is sleeved in the secondary filter screen, the primary filter screen is of an elastic telescopic structure, the primary filter screen comprises a plurality of continuous convex portions, each convex portion is provided with a wide width, and the end of the primary filter screen away from the top cover is fixed with a power plate; the coated chemical filter screen further comprises a turbulence assembly, the turbulence assembly comprises an air bag which is fixed between the top cover and the power plate; air flows into the primary filter screen through the top cover to be subjected to primary filtration, and the power plate is pushed to make the primary filter screen be elastically stretched, and the wide width is enlarged; the coated chemical filter screen solves the problems that the traditional filter screen is prone to forming particulate matter "concentrated interception" due to uneven air distribution, a consolidated layer is blocked due to static accumulation, a pore diameter is blocked, high-strength backwashing or manual maintenance is needed, dynamic response to particulate matter concentration change is unavailable, and the dust holding capacity of the fixed structure filter screen is rapidly attenuated due to local blockage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical filter screen, in particular to a coated chemical filter screen. BACKGROUND

[0002] Chemical filter screen is a device for air purification, usually made of chemical fiber or glass fiber, mainly used to intercept particulate matter contained in the air passing through the filter screen or to adsorb harmful substances through the filter material coated inside (such as coating activated carbon particles or ion exchange resin with filter cloth).

[0003] The chemical filter screen generally includes a frame and a filter screen part fixed in the frame. After the traditional filter screen intercepts particulate matter in the gas, a hardening layer is easily formed due to static accumulation, resulting in a reduction in local pore size or even blockage, which requires high-strength backwashing or frequent manual cleaning. Most self-cleaning filter screens rely on fixed thresholds (such as pressure difference or time) to trigger cleaning, which is difficult to dynamically respond to changes in particulate matter load, resulting in insufficient cleaning or excessive resource consumption (such as backwashing water / gas volume). The fixed structure filter screen is prone to form "concentrated interception" in local areas due to uneven airflow distribution, which accelerates clogging and reduces the overall dust holding capacity. SUMMARY

[0004] The present application aims to solve the problems of traditional filter screens, such as uneven airflow distribution leading to "concentrated interception" of particulate matter, static accumulation causing hardening layer to block pore size, and the need for high-strength backwashing or manual maintenance. The present application proposes a coated chemical filter screen that can dynamically respond to changes in particulate matter concentration and has a high dust holding capacity.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a coated chemical filter screen includes a top cover and a bottom plate, a cylindrical secondary filter screen is fixed between the top cover and the bottom plate, a primary filter screen is sleeved in the secondary filter screen, the primary filter screen is of elastic expansion structure, and the primary filter screen includes a plurality of continuous convex parts, each convex part is provided with a wide width.

[0006] The end of the primary filter screen away from the top cover is fixed with a power plate.

[0007] The coated chemical filter screen further includes a turbulence assembly, the turbulence assembly includes an air bag fixed between the top cover and the power plate.

[0008] When filtering air, the airflow enters the primary filter screen through the top cover for primary filtration, and pushes the power plate to elastically stretch the primary filter screen, making the wide width larger. The air bag is stretched and deformed through the primary filter screen, and the airflow forms a scattered flow field through the deformed air bag, so that the particulate matter moves disorderly in the primary filter screen.

[0009] When stopping purification, the primary filter screen rebounds and shrinks, and the wide width becomes smaller. The particulate matter falls off the convex parts.

[0010] As a further description of the above-mentioned technology, the air bag is fixedly installed with an exhaust pipe on one side, and a dust suction pipe on the other side, the dust suction pipe is provided with a plurality of suction holes, and the dust suction pipe is fixed on the power plate through a flange plate.

[0011] The exhaust pipe and the dust suction pipe are fixedly installed with a one-way valve.

[0012] The air bag compresses the gas inside to be discharged through the exhaust pipe, and the particulate matter is sucked into the air bag in the process of recovery through the suction hole.

[0013] As a further description of the above-mentioned technology, the air bag is fixedly installed with an exhaust pipe on one side, and a dust suction pipe on the other side, the dust suction pipe is provided with a plurality of suction holes, and the dust suction pipe is fixed on the power plate through a flange plate.

[0014] A plurality of annularly distributed spring wires are fixed in the interlayer of the filter segment.

[0015] The spring wire includes a plurality of continuous support protrusions matched with the inner protrusion and the outer protrusion.

[0016] As a further description of the above-mentioned technology, a plurality of support protrusions are fixedly connected with a limiting steel wire, the limiting steel wire is fixed in the interlayer of the filter segment, and is used for positioning the spring wire.

[0017] As a further description of the above-mentioned technology, the air bag is fixedly installed with an exhaust pipe on one side, and a dust suction pipe on the other side, the dust suction pipe is provided with a plurality of suction holes, and the dust suction pipe is fixed on the power plate through a flange plate.

[0018] As a further description of the above-mentioned technology, the bottom plate is fixedly installed with a guide pipe on one side close to the top cover, the power plate is adapted with the guide pipe, and the bottom plate is provided with a pressure relief hole at the bottom.

[0019] As a further description of the above-mentioned technology, the opening end of the guide pipe is fixedly installed with a limiting ring, and the limiting ring has a smaller diameter than the inner diameter of the power plate.

[0020] The first filter net is pulled by the elastic retraction of the power plate, the power plate collides with the inner wall of the limiting ring, and the particulate matter on the first filter net is shaken off.

[0021] As a further description of the above-mentioned technology, the air bag is fixedly installed with an exhaust pipe on one side, and a dust suction pipe on the other side, the dust suction pipe is provided with a plurality of suction holes, and the dust suction pipe is fixed on the power plate through a flange plate.

[0022] As a further description of the above-mentioned technology, the air bag is fixedly installed with an exhaust pipe on one side, and a dust suction pipe on the other side, the dust suction pipe is provided with a plurality of suction holes, and the dust suction pipe is fixed on the power plate through a flange plate.

[0023] In summary, due to the adoption of the above-mentioned technology, the beneficial effects of the present application are:

[0024] 1. The primary filter screen is supported by spring steel wires and combined with the power plate linkage, which can dynamically adjust the width and curvature according to the air flow pressure, increase the interception area while changing the curvature of the particle contact surface, reduce the adhesion stability, and improve the filtration efficiency and dust holding capacity.

[0025] 2. The primary filter screen is supported by spring steel wires and combined with the power plate linkage, which can dynamically adjust the width and curvature according to the air flow pressure, increase the interception area while changing the curvature of the particle contact surface, reduce the adhesion stability, and improve the filtration efficiency and dust holding capacity.

[0026] 3. The air bag compression / restoration drive exhaust pipe and the dust suction pipe work alternately, combined with a one-way valve to realize the directional adsorption-external discharge cycle of particles, forming a continuous self-cleaning mechanism, prolonging the service life of the filter screen.

[0027] 4. The air bag, filter screen and guide pipe are connected by flanges, threaded or pressed edge fixed structure, supporting quick replacement or cleaning; U-shaped bend dust storage design avoids valve blockage, reduces maintenance difficulty and downtime cost;

[0028] 5. The primary filter screen (physical interception) and the secondary activated carbon filter screen (chemical adsorption) are nested and linked, combined with air flow disturbance and filter screen swing to improve particle diffusion efficiency, reduce the load of the secondary filter screen, and improve the overall purification effect and stability. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The overall structure schematic diagram provided by the embodiment of the present application is shown;

[0030] Figure 2 The overall bottom structure schematic diagram provided by the embodiment of the present application is shown;

[0031] Figure 3 The overall cut structure schematic diagram provided by the embodiment of the present application is shown;

[0032] Figure 4 The overall cut structure schematic diagram provided by the embodiment of the present application is shown; Figure 3 The enlarged structure schematic diagram at A in the above figure is shown;

[0033] Figure 5 The filter section and power plate structure schematic diagram provided by the embodiment of the present application is shown;

[0034] Figure 6 The filter section and power plate structure schematic diagram provided by the embodiment of the present application is shown; Figure 5 The cut structure schematic diagram provided by the embodiment of the present application is shown;

[0035] Figure 7A front structure schematic diagram is shown according to an embodiment of the present application Figure 6 A front structure schematic diagram is shown according to an embodiment of the present application

[0036] Figure 8 A front structure schematic diagram is shown according to an embodiment of the present application

[0037] Figure 9 A front structure schematic diagram is shown according to an embodiment of the present application

[0038] Figure 10 A front structure schematic diagram is shown according to an embodiment of the present application

[0039] Figure 11 A front structure schematic diagram is shown according to an embodiment of the present application

[0040] Figure 12 A front structure schematic diagram is shown according to an embodiment of the present application

[0041] Legend:

[0042] 10, top cover

[0043] 20, bottom plate; 21, guide pipe; 22, limiting ring; 23, pressure relief hole

[0044] 30, primary filter screen; 31, filter section; 32, inner protrusion; 33, outer protrusion; 34, power plate; 35, spring wire; 351, limiting wire; 352, support protrusion; 36, edge ring plate

[0045] 40, secondary filter screen

[0046] 50, turbulence assembly; 51, air bag; 52, fixed ring holder; 53, exhaust pipe; 54, dust suction pipe; 541, adsorption hole; 55, one-way valve; 56, U-shaped bend DETAILED DESCRIPTION

[0047] The technical coated chemical filter screen in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0048] As Figure 1 - Figure 12As shown, the present application provides: a coated chemical filter screen, comprising a top cover 10 and a bottom plate 20, a cylindrical secondary filter screen 40 is fixed between the top cover 10 and the bottom plate 20, and the top cover 10 further fixes a cylindrical primary filter screen 30 which is sleeved in the secondary filter screen 40, the primary filter screen 30 intercepts the primary particulate matter of the gas, and the secondary filter screen 40 adsorbs the harmful substances through the activated carbon particles coated in the interlayer thereof, the primary filter screen 30 is of an elastic extension structure, and the primary filter screen 30 comprises a plurality of continuous convex portions, and each convex portion is provided with a wide width;

[0049] The end of the primary filter screen 30 away from the top cover 10 is fixed with a power plate 34;

[0050] Further comprising a turbulence assembly 50, the turbulence assembly 50 comprises an air bag 51 fixed between the top cover 10 and the power plate 34;

[0051] When filtering the gas, the gas flows into the primary filter screen 30 through the top cover 10 to perform the primary filtration, and the power plate 34 is pushed to elastically stretch the primary filter screen 30, and the wide width is enlarged; the air bag 51 is stretched and deformed through the primary filter screen 30, and the gas flow forms a scattered flow field through the deformed air bag 51, so that the particulate matter moves disorderly in the primary filter screen 30; after the flow enters through the gas inlet above the top cover 10, part of the gas flow directly enters the primary filter screen 30, and the other part of the gas flow is disturbed through the air bag 51, and when the gas flow pushes the power plate 34 to move downward, the air bag 51 is stretched and deflated, and the outer shape thereof becomes irregular, and the gas flow also forms a scattered flow field when passing through the irregular surface of the air bag 51; and when the power plate 34 stretches the primary filter screen 30, the wide width follows to become larger, and the primary filter screen 30 changes the position of the particulate matter in the process of stretching to effectively diffuse the accumulated particulate matter, and also plays a role of changing the position of the filter screen mesh to avoid the problem of reducing the filtering effect of the region after the accumulation;

[0052] At the same time, the stretching of the primary filter screen 30 reduces the adhesion ability of the particulate matter, so that the particulate matter cannot form a hardening on the surface thereof;

[0053] At the same time, after the primary filter screen 30 is stretched to effectively disperse the particulate matter, the gas flowability is better, so that the gas flow through the primary filter screen 30 gradually increases, and the force acting on the power plate 34 gradually decreases, thereby making the power plate 34 move upward, the primary filter screen 30 shrinks while the air bag 51 restores, the power plate 34 moves upward to push the gas flow, and the surface shape of the air bag 51 gradually changes in the process of gradually restoring, and an outward pushing force of the gas flow is generated, thereby playing a role of disturbing the gas flow in the primary filter screen 30;

[0054] When the air pressure in the primary filter screen 30 repeatedly changes, the repeated contraction of the primary filter screen 30 can shake off the particles on the surface of the primary filter screen 30, and the repeated compression or recovery of the air bag 51 changes the space in the primary filter screen 30, so that the primary filter screen 30 forms a disordered flow field. When the disordered gas flow field passes through the particles attached to the primary filter screen 30, part of the particles fall off the primary filter screen 30 and move disorderly inside the primary filter screen 30, so as to avoid the direct interception of all particles in the airflow on the primary filter screen 30, thereby reducing the thickness of the primary filter screen 30 for intercepting particles.

[0055] Moreover, when the disordered flow field appears in the primary filter screen 30, and the particle coverage area and thickness of the primary filter screen 30 are different, the airflow passing rate of the inner wall of the primary filter screen 30 is different, so that the primary filter screen 30 swings disorderly in the secondary filter screen 40, and when the primary filter screen 30 swings or collides with the secondary filter screen 40, part of the particles are shaken off or shaken off through vibration.

[0056] When the purification is stopped, the primary filter screen 30 rebounds and contracts, and the width becomes smaller; the particles fall off from the convex part. When the gas purification is stopped, the air pressure in the primary filter screen 30 decreases suddenly, the primary filter screen 30 rebounds quickly, and the width changes from large to small instantaneously. In the process of quick elastic contraction of the primary filter screen 30, the primary filter screen 30 is repeatedly shaken under the action of inertial force, so that the particles are shaken off from the inside of the primary filter screen 30. By shaking off part of the particles to the bottom of the primary filter screen 30, it can be avoided that a large amount of particles are blocked in a large area of the primary filter screen 30.

[0057] As shown in Figure 3 、 Figure 10 、 Figure 11 To reduce the particles in the primary filter screen 30, the exhaust pipe 53 and the dust suction pipe 54 are both hard pipes. The dust suction pipe 54 is fixed on the power plate 34 through a flange, and the exhaust pipe 53 is connected through the air bag 51 above. The exhaust pipe 53 is fixed on the lower surface of the top cover 10 through a fixed ring frame 52, and the lower end is connected to the dust suction pipe 54 with a plurality of adsorption holes 541 on the surface;

[0058] And a one-way valve 55 is fixedly installed on the exhaust pipe 53 and the dust suction pipe 54. When the one-way valve 55 on the exhaust pipe 53 is opened, the one-way valve 55 on the dust suction pipe 54 is closed, and vice versa.

[0059] Therefore, when the air bag 51 is compressed by the stretching deformation of the power plate 34 and the compression of the high-pressure gas, the one-way valve 55 on the exhaust pipe 53 is opened, and the one-way valve on the dust suction pipe 54 is closed, so that the gas inside is discharged through the exhaust pipe 53, and when the air bag 51 is restored, the internal gas pressure gradually increases, so that the one-way valve 55 on the exhaust pipe 53 is closed, and the one-way valve on the dust suction pipe 54 is opened, and part of the particulate matter in the primary filter screen 30 is sucked into the air bag 51 in the process of restoration through the adsorption hole 541, thereby reducing the particulate matter in the primary filter screen 30.

[0060] Notably, the side wall of the exhaust pipe 53 is annularly distributed with a plurality of exhaust holes facing the primary filter screen 30, which can blow towards the inner wall of the primary filter screen 30 when the exhaust holes are exhausted, and the airflow perpendicular to the exhaust direction plays a role of turbulence when passing through;

[0061] The exhaust hole is an internal thread hole, which is screwed with a dust discharge pipe (not shown in the figure) with an external thread, and the dust discharge pipe is led out to the outside of the entire filter screen after passing through the top cover 10, and the outlet of the dust discharge pipe is away from the purification environment, so that when the exhaust pipe 53 exhausts, the particulate matter in the air bag 51 can be discharged through the dust discharge pipe when the exhaust gas carries the particulate matter, thereby avoiding the particulate matter flowing back into the primary filter screen 30 after flowing out through the exhaust hole, so as to reduce the content of particulate matter in the primary filter screen 30.

[0062] As shown in Figure 5 , Figure 6 , Figure 7 , Figure 8 To be able to shape the primary filter screen 30, while having an extension state, the primary filter screen 30 includes a cylindrical filter section 31, which includes a plurality of groups of inner convex portions 32 and outer convex portions 33 that are sequentially and continuously arranged and have opposite convex surfaces, a plurality of annularly distributed spring wires 35 are stitched and fixed in the interlayer of the filter section 31, and the width of the inner convex portion 32 is "b" and the width of the outer convex portion 33 is "a"; the spring wire 35 includes a plurality of support convex portions 352 that are continuous and matched with the inner convex portion 32 and the outer convex portion 33, so as to support the inner convex portion 32 and the outer convex portion 33 in a circular arc structure and shape;

[0063] Further, when the spring wire 35 is deformed and stretched, the widths "a" and "b" are both increased, and since there is a gap between adjacent spring wires 35, the primary filter screen 30 will locally deform irregularly during the increase in width, change the curvature of the inner wall to control the contact area of the adhered particles, and form a drop;

[0064] Moreover, after the curvature of the inner wall of the primary filter screen 30 changes, the disordered airflow inside the primary filter screen 30 changes after passing through different curved surface positions, and the airflow passing through the curved surface position of the airflow passing through the primary filter screen 30 forms a back-blowing particle effect (as shown inFigure 12 As shown in the figure, the air flow is blown from the first filter screen 30, so that the particles can be blown off from the first filter screen 30, and the blown area keeps normal air flow.

[0065] As shown in the figure, in order to avoid the problem of spring wire 35 running, the limiting wire 351 is fixedly connected to the plurality of supporting protrusions 352, and the limiting wire 351 is stitched in the interlayer of the filter section 31, so as to position the spring wire 35, thereby ensuring the shaping effect of the spring wire 35 on the first filter screen 30. Figure 8

[0066] As shown in the figure, the air flow is blown from the first filter screen 30, so that the particles can be blown off from the first filter screen 30, and the blown area keeps normal air flow. Figure 10 As shown in the figure, the air flow is blown from the first filter screen 30, so that the particles can be blown off from the first filter screen 30, and the blown area keeps normal air flow.

[0067] As shown in the figure, the air flow is blown from the first filter screen 30, so that the particles can be blown off from the first filter screen 30, and the blown area keeps normal air flow. Figure 3 Figure 4 Figure 5 Figure 9 As shown in the figure, the air flow is blown from the first filter screen 30, so that the particles can be blown off from the first filter screen 30, and the blown area keeps normal air flow.

[0068] As shown in the figure, the air flow is blown from the first filter screen 30, so that the particles can be blown off from the first filter screen 30, and the blown area keeps normal air flow. Figure 4 Figure 9 As shown in the figure, the air flow is blown from the first filter screen 30, so that the particles can be blown off from the first filter screen 30, and the blown area keeps normal air flow.

[0069] At the same time, the first filter screen 30 is pulled back elastically to pull the power plate 34, the power plate 34 collides with the inner wall of the limiting ring 22 to make the first filter screen 30 vibrate, thereby shaking off the particles on the first filter screen 30.

[0070] As shown in the figure, the air flow is blown from the first filter screen 30, so that the particles can be blown off from the first filter screen 30, and the blown area keeps normal air flow. Figure 10 ​​​​​As shown, in order to avoid a large amount of particulate matter accumulated in the one-way valve 55 when the dust suction pipe 54 is vertically arranged, the U-shaped bend 56 is fixed between the air bag 51 and the dust suction pipe 54, so that the U-shaped bend 56 plays a role of storing dust, avoiding the accumulation of particulate matter in the one-way valve 55.

[0071] As shown in Figure 10 , Figure 11 The exhaust pipe 53 is a two-section threaded connection structure, the dust suction pipe 54 is detachable from the power plate 34 through the flange, and the air bag 51 can be disassembled, so that the dust particles in the air bag 51 can be cleaned by disassembling the air bag 51 regularly.

[0072] In order to facilitate the replacement of the primary filter screen 30, the open end of the primary filter screen 30 is sewn and fixed with a skirt, and the two skirts are fixed on the top cover 10 and the power plate 34 respectively through the edge pressing ring plate 36.

[0073] Working principle: when the air inlet in the top cover 10, especially when the air flow is unstable, part of the air flow is directly filtered through the primary filter screen 30 and the secondary filter screen 40, and part of the air flow is retained in the primary filter screen 30, and the internal air pressure is increased. When the air pressure in the primary filter screen 30 is increased, the power plate 34 moves to the bottom plate 20 and stretches the primary filter screen 30 and the spring wire 35, so that the spring wire 35 is deformed and stores energy;

[0074] At the same time, the air bag 51 with the streamline structure of wide and thick in the middle and gradually narrowing at both ends is stretched and deflated, changing the curvature of the primary filter screen 30 and the air bag 51, and disturbing the internal airflow, and the air bag 51 compresses the internal gas and discharges it through the exhaust pipe 53;

[0075] When the elastic contraction force of the spring wire 35 is greater than the air pressure in the primary filter screen 30, the primary filter screen 30 is contracted, and in the process of recovery of the air bag 51, the particulate matter floating in the primary filter screen 30 is adsorbed through the multiple adsorption holes 541;

[0076] At the same time, in the process of compression and recovery of the power plate 34 and the air bag 51, the airflow in the primary filter screen 30 is disturbed again, and internal buffeting phenomenon is formed;

[0077] The primary filter screen 30 after buffeting and disturbance swings in the secondary filter screen 40, and when the power plate 34 collides with the secondary filter screen 40, part of the particulate matter on the inner wall of the primary filter screen 30 is shaken off or scattered;

[0078] When the air pressure in the primary filter screen 30 becomes large and the spring wire 35 is stretched and deformed, the gas in the air bag 51 is discharged, and part of the particulate matter in the interior is discharged to the outside again through the dust discharge pipe;

[0079] Finally, the content of the particles in the primary filter screen 30 is reduced by the cycle of shaking off the particles-adsorbing the particles-discharging the particles, so as to guarantee the service life and normal filtering effect of the primary filter screen 30.

[0080] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent substitutions or changes to the coated chemical filter screen and the inventive concept thereof within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A covered chemical filter screen comprising a top cover (10) and a bottom plate (20), characterized in that, A cylindrical secondary filter screen (40) is fixed between the top cover (10) and the bottom plate (20), and a primary filter screen (30) is fixed in the secondary filter screen (40), wherein the primary filter screen (30) is of elastic expansion structure and comprises a plurality of continuous convex portions, each of which is provided with a wide width; The primary filter screen (30) is fixed with a power plate (34) at one end away from the top cover (10); Further comprising a turbulence assembly (50) comprising an air bag (51) fixed between the top cover (10) and the power plate (34); When filtering air, the airflow enters the primary filter screen (30) through the top cover (10) to perform primary filtering, and the power plate (34) is pushed to elastically stretch the primary filter screen (30) to increase the wide width; the air bag (51) is stretched and deformed through the primary filter screen (30), and the airflow through the deformed air bag (51) forms a scattered flow field, so that the particulate matters move disorderly in the primary filter screen (30); When stopping purification, the primary filter screen (30) rebounds and shrinks to reduce the wide width; the particulate matters are shaken off from the convex portions; One side of the air bag (51) is fixedly provided with an exhaust pipe (53), and the other side of the air bag (51) is fixedly provided with a dust suction pipe (54), wherein a plurality of suction holes (541) are formed in the dust suction pipe (54), and the dust suction pipe (54) is fixed on the power plate (34) through a flange; The exhaust pipe (53) and the dust suction pipe (54) are both fixedly provided with a one-way valve (55); The air bag (51) compresses the gas inside to be discharged through the exhaust pipe (53), and the particulate matters are sucked into the air bag (51) in recovery through the suction holes (541); The air bag (51) is of a streamlined structure with a wide and thick middle part and gradually narrowed two ends, and the exhaust pipe (53) and the dust suction pipe (54) are fixed at the small-diameter end of the air bag (51).

2. The coated chemical filter of claim 1, wherein, The primary filter screen (30) comprises a cylindrical filter section (31), and the filter section (31) comprises a plurality of groups of inner convex portions (32) and outer convex portions (33) arranged continuously in sequence; A plurality of annular spring wires (35) are fixed in the interlayer of the filter section (31); The spring wire (35) comprises a plurality of continuous support convex portions (352) matched with the inner convex portions (32) and the outer convex portions (33).

3. The coated chemical filter of claim 2, wherein, A plurality of limit wires (351) are fixedly connected to the support convex portions (352), and the limit wires (351) are fixed in the interlayer of the filter section (31) to position the spring wire (35).

4. The coated chemical filter of claim 1, wherein, The bottom plate (20) is fixed with a guide pipe (21) on one side close to the top cover (10), the power plate (34) is adapted to the guide pipe (21), and a pressure relief hole (23) is formed in the bottom of the bottom plate (20).

5. The coated chemical filter of claim 4, wherein, The opening end of the guide pipe (21) is fixed with a limit ring (22), and the inner diameter of the limit ring (22) is smaller than the diameter of the power plate (34); The primary filter screen (30) is elastically retracted to pull the power plate (34), and the power plate (34) collides with the inner wall of the limit ring (22) after being pulled to shake off the particulate matters on the primary filter screen (30).

6. The coated chemical filter of claim 2, wherein, A U-shaped bend (56) is fixed between the air bag (51) and the dust suction pipe (54).

7. The coated chemical filter of claim 2, wherein, The exhaust pipe (53) is a two-section detachable structure, and the dust suction pipe (54) is detachable with the power board (34).

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