CN117443104A

CN117443104A - Dry chemical filter

Info

Publication number: CN117443104A
Application number: CN202311770924.5A
Authority: CN
Inventors: 陈福
Original assignee: Guangzhou Fulin Environmental Protection Technology Co ltd
Current assignee: Guangzhou Fulin Environmental Protection Technology Co ltd
Priority date: 2023-12-21
Filing date: 2023-12-21
Publication date: 2024-01-26
Anticipated expiration: 2043-12-21
Also published as: CN117443104B

Abstract

The invention relates to the technical field of gas filters, in particular to a dry chemical filter, which comprises a shell for guiding and treating sewage gas, wherein a plurality of fans which guide the gas to enter and can rotate forward and backward are arranged on the shell; the filter screen is movably arranged on the shell, the filter screen is automatically cleaned after being displaced, guide rods for guiding movement are arranged on two sides of the filter screen, a magnet is arranged on one side of the guide rods, which faces the fan, of the filter screen, an air bag I is correspondingly arranged on the shell, and the air bag I is arranged between the magnet and the electromagnet; the sealing piece is used for opening and closing according to the position of the filter screen and limiting the sewage to enter the shell, and simultaneously changing the rotation direction of the fan to blow the filter screen, the sealing piece comprises a fixed plate and a movable plate which are connected in a sliding manner and can be ventilated, and the fixed plate and the movable plate are staggered to limit the air to enter. The invention provides a stable environment for cleaning, improves the cleaning efficiency, does not need shutdown treatment, reduces the maintenance time, and is more intelligent for cleaning at regular and fixed time intervals.

Description

Dry chemical filter

Technical Field

The invention relates to the technical field of gas filters, in particular to a dry chemical filter.

Background

The polluted air contains more pollutants, and the pollutants not only comprise particles, but also comprise chemical pollutants such as ammonia, SO2, alkane, aldehyde and other acid-base substances. In order to clean air, neutralization and absorption are generally performed with specific chemical reagents in the treatment of chemical contaminants. But the gas is pre-treated before treatment for particulate matter, and a large amount of particulate matter easily forms a hardened plug in the filter holes, which affects the purification effect of the final air.

The Chinese patent network discloses the following publication numbers: CN218981074U, the name is a dry-type chemical filter for air purification, which comprises a box body, the inner space of box has set gradually the subassembly of bleeding from bottom to top, purifying and drying subassembly, chemical filter subassembly and exhaust subassembly, purifying and drying subassembly includes diaphragm and filter cloth bag, from bottom to top wear the air of filter cloth bag and get into chemical filter subassembly, the clean air outside the box gets into the box and sprays on the last bag face of filter cloth bag, when having solved chemical filter and absorbing the particulate matter in the air, the particulate matter hardening forms the jam on the filter screen surface, influence the problem of air purification effect, filter cloth bag on the one hand can absorb steam and the particulate matter in the air, on the other hand can blow away the particulate matter that the hardening appears on filter cloth bag surface again through the reverse of air, maintain filter drying ability of filter cloth bag all the time, air purification effect promotes.

In the above publication, the following disadvantages exist:

1. cleaning the filter cloth bag is realized only by back blowing, particles accumulated on the filter cloth bag cannot be blown out well, and the cleaning effect is poor;

2. when the cleaning, dirty gas still is getting into in the continuation, can not provide stable environment for the clearance, has reduced the effect of blowback again, needs to observe the clearance opportunity and manual control clearance, and is not convenient enough.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention provides the dry chemical filter, which can effectively solve the problems that the cleaning effect is not good, a stable environment cannot be provided for cleaning, and the cleaning is not convenient enough in the prior art.

In order to achieve the above purpose, the invention is realized by the following technical scheme:

the present invention provides a dry chemical filter comprising:

the device comprises a shell for guiding the sewage gas into a plurality of cavities for treatment, wherein a plurality of fans which guide the gas into and can rotate forward and backward are arranged on the shell;

the filter screen is movably arranged on the shell and positioned between the air inlet end and the fan and is used for preprocessing air, and the filter screen is automatically cleaned after being displaced, guide rods for guiding movement are arranged on two sides of the filter screen, magnets are arranged on one sides of the guide rods, facing the fan, of the filter screen, electromagnets are correspondingly arranged on the shell, and an air bag I is arranged between the magnets and the electromagnets;

the sealing piece is used for opening and closing according to the position of the filter screen and limiting the sewage to enter the shell, and simultaneously changing the rotation direction of the fan to blow the filter screen, the sealing piece comprises a fixed plate and a movable plate which are connected in a sliding manner and can be ventilated, and the fixed plate and the movable plate are staggered to limit the air to enter.

Further, the shell is provided with an air inlet and two groups of treatment cavities which are communicated with the air inlet, the two groups of treatment cavities are not communicated, and the filter screen is positioned in the treatment cavities.

Further, fan electrode plates electrically connected with the fan are arranged on the inner wall of the shell, which is attached to the sealing piece, two groups of fan electrode plates are arranged, and the connection directions of the two groups of fan electrode plates and the fan electrode are opposite.

Further, one side of the guide rod, which is far away from the magnet and is close to the sealing element, is provided with an electromagnetic iron electrode plate electrically connected with the electromagnet, an elastic element for resetting is arranged in the first air bag, a one-way air inlet valve and a one-way air outlet valve are arranged on the first air bag, and the air outlet speed of the air outlet valve is greater than the air inlet speed of the air inlet valve and is used for increasing the cleaning time of the filter screen.

Further, the fixed plate is provided with a plurality of groups of vent holes I which are distributed at equal intervals, the movable plate is provided with a plurality of groups of vent holes II which are distributed at equal intervals, the movable plate is provided with a first conductive block for communicating an electromagnetic ferroelectric pole piece and a second conductive block for connecting a fan electrode piece, the bottom of the movable plate is provided with an air bag II communicated with the air bag I, and the air bag II is provided with a leakage hole.

Further, a deflector rod is arranged on the filter screen, a guide ring for guiding and preventing the deflector rod from inclining is arranged on the shell, sliding rods which are connected with the guide rods in a sliding mode are arranged on two sides of the filter screen, and springs are arranged between the sliding rods and the guide rods and used for reserving a vibration space when the deflector rod is flapped for the fan and the filter screen is vibrated.

Further, the filter screen bottom is equipped with the shrouding, and is equipped with the exhaust hole on the shrouding, shell bottom corresponds the department with the shrouding and is equipped with the dirt collecting tank of collecting debris, and is equipped with dirt collecting hole and on the dirt collecting tank, and the exhaust hole is located dirt collecting hole and centre, be equipped with dustproof sack on the dirt collecting hole.

Further, the dirt collecting drawer is slidably arranged on the dirt collecting groove, and a guide plate which is attached to the sealing plate and guides the discharged gas of the dirt collecting hole to face one side of the fan close to the processing cavity is arranged on the shell.

Further, the chemical filling filter piece is arranged on the shell, and the chemical filling filter piece is positioned on one side of the fan away from the filter screen.

Advantageous effects

Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:

1. the filter screen is driven by accumulation of particles attached to the surface of the filter screen, the electromagnet is electrified and displaced again by moving the filter screen and pushing the guide rod to reach a preset distance, and the movable plate is pushed to rise by the extrusion air bag, so that the entry of sewage is prevented, and a stable environment is provided for cleaning;

2. the rotating direction of the fan is changed by lifting the movable plate, air is blown towards the filter screen, dust particles on the filter screen are cleaned, meanwhile, the stirring rod arranged on the filter screen is matched with the fan to contact the fan, the filter screen is stirred to vibrate, particle impurities adsorbed on the surface of the filter screen are removed again, and cleaning efficiency is improved;

3. the dirt collecting holes and cavities at two sides of the communicated filter screen are moved through the sealing plate arranged at the bottom of the filter screen, sundries are filtered and collected, and the dirt collecting drawer can be pulled out for centralized treatment after the filter screen is reset, so that the operation is simple, the shutdown treatment is not needed, and the maintenance time is reduced;

4. through being equipped with one-way admission valve and one-way discharge valve on gasbag one, and discharge valve's exhaust velocity is greater than admission valve air intake velocity, and the leak on the cooperation gasbag two leaks gas, increases the time to the filter screen clearance, realizes regularly long clearance, more intelligent.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a partial cross-sectional view of the housing of the present invention;

FIG. 3 is a partial cross-sectional view of the present invention;

FIG. 4 is a cross-sectional view of the attachment of the filter screen to the housing of the present invention;

FIG. 5 is an exploded schematic view of the structure of the filter screen and the dirt collection tank of the present invention;

FIG. 6 is a schematic diagram of the connection of the filter screen to the dirt collection drawer of the present invention;

fig. 7 is a schematic structural view of the seal of the present invention.

Reference numerals: 1. a housing; 11. an air inlet; 12. a processing chamber; 13. a fan; 131. a fan electrode plate; 14. a sewage collecting tank; 141. a dirt collecting hole; 142. an exhaust hole; 15. a dirt collection drawer; 16. a guide ring; 17. chemically filling the filter element; 2. a seal; 21. a fixing plate; 211. a first vent hole; 22. a movable plate; 221. a second vent hole; 222. a first conductive block; 223. a second conductive block; 224. an air bag II; 3. a filter screen; 311. a slide bar; 32. a guide rod; 321. a spring; 322. an electromagnetic ferroelectric sheet; 323. a magnet; 324. an air bag I; 325. an electromagnet; 33. a sealing plate; 331. an exhaust hole; 34. a deflector rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The invention is further described below with reference to examples.

Examples:

a dry chemical filter, referring to fig. 1-7, comprising:

the shell 1 is used for guiding the dirty gas into a plurality of cavities for treatment, the dirty gas enters the plurality of cavities for separate treatment, so that later maintenance is convenient, shutdown is not needed during maintenance, during maintenance is realized, equipment use efficiency is improved, a plurality of fans 13 which guide the gas to enter and can rotate forward and backward are arranged on the shell 1, the dirty gas enters the shell 1 for treatment through forward rotation of the fans 13, and reverse blowing of the fans 13 is convenient for cleaning pretreatment equipment, and cleaning speed and efficiency are improved.

Specifically, be equipped with air inlet 11 and two sets of processing chamber 12 that all communicate with air inlet 11 on the shell 1, and two sets of processing chamber 12 do not communicate, and filter screen 3 is located processing chamber 12, and in the gas guide that will treat gets into different processing chamber 12 through air inlet 11, handles simultaneously, and can select intermittent type maintenance when maintaining, keeps the normal use of equipment.

The filter screen 3 movably arranged on the shell 1 and positioned between the air inlet end of the shell 1 and the fan 13, the filter screen 3 pretreats the sewage extracted by the fan 13, removes particles, prevents the air from blocking the contact hole on the chemical treatment layer, automatically cleans the filter screen 3 after displacement of the filter screen 3, guide rods 32 for guiding the movement are arranged on two sides of the filter screen 3, a magnet 323 is arranged on one side of the guide rods 32 towards the fan 13, an electromagnet 325 is correspondingly arranged on the shell 1, an air bag one 324 is arranged between the magnet 323 and the electromagnet 325, after displacement occurs due to the fact that more particles are adhered on the surface of the filter screen 3, the electromagnetic iron pole piece 322 on the guide rods 32 is moved and driven to be connected, and accordingly the electromagnet 325 is started to adsorb the magnet 323 to generate displacement, so that cleaning operation is performed.

Specifically, the inner wall of the shell 1, which is attached to the sealing element 2, is provided with two groups of fan electrode plates 131 which are electrically connected with the fan 13, the two groups of fan electrode plates 131 are vertically distributed up and down, the connection directions of the two groups of fan electrode plates 131 and the fan 13 are opposite, and the rotation direction of the fan 13 is adjusted by changing the connection of the fan electrode plates 131 with different up and down directions, so that the air blowing of the to-be-treated gas or the filter screen 3 is realized, in the working state, the two poles of the fan 13 are connected with the fan electrode plates 131 below, at the moment, the fan 13 positively rotates to extract the sewage gas to pass through the filter screen 3 for treatment, and after the filter screen 3 moves, the two pole of the fan 13 is connected with the fan electrode plates 131 above, so that the current of the fan 13 is changed to blow the filter screen 3, and finally sundries are collected;

further, the guide rod 32 is far away from the magnet 323 and is close to the electromagnetic iron plate 322 electrically connected with the electromagnet 325 on one side of the sealing element 2, when the guide rod 32 is located and moves to reach a preset distance, the electromagnetic iron plate 322 is connected to energize the electromagnet 325, so that the first air bag 324 is extruded, an elastic element for resetting is arranged in the first air bag 324, the first air bag 324 is conveniently recovered when not extruded and is used for blowing and pressurizing on the next side, a one-way air inlet valve and a one-way air outlet valve are arranged on the first air bag 324, and the air outlet speed of the air outlet valve is greater than the air inlet speed of the air inlet valve and is used for increasing cleaning time of the filter screen 3.

Still further, be equipped with driving lever 34 on the filter screen 3, and be equipped with the guide ring 16 that guides and prevent driving lever 34 slope on the shell 1, follow the filter screen 3 through driving lever 34 and remove and contact in fan 13 for fan 13 stirs fan 13 and produces vibrations, thereby shake the dust off, the both sides of filter screen 3 are equipped with slide bar 311 with guide bar 32 sliding connection, and be equipped with spring 321 between slide bar 311 and the guide bar 32, make driving lever 34 be in the position that can stir by fan 13 all the time through spring 321, be used for simultaneously for fan 13 to beat driving lever 34 and reserve the vibration space when vibrations filter screen 3.

It is worth to say that the filter screen 3 bottom is equipped with shrouding 33, and be equipped with exhaust hole 331 on the shrouding 33, exhaust hole 331 is located the intermediate position of shrouding 33, shell 1 bottom is equipped with the dirt collecting tank 14 of collecting debris with shrouding 33 corresponds the department, and be equipped with dirt collecting holes 141 and 142 on the dirt collecting tank 14, and exhaust hole 331 is located dirt collecting holes 141 and 142 in the middle, remove 142 through shrouding 33 and spill, thereby collect the debris that trembles off on the filter screen 3, dirt collecting hole 141 and exhaust hole 331 coincide simultaneously, be convenient for gaseous overflow, gaseous when discharging from dirt collecting hole 141 and exhaust hole 331 to process chamber 12, also can drive debris entering dirt collecting tank 14, be equipped with dustproof sack on the dirt collecting hole 141, filter debris through the dustproof sack on the dirt collecting hole 141, when filter screen 3 resets, shrouding 33 covers dirt collecting holes 141 and 142, collect the dust in dirt collecting tank 14.

The dirt collecting drawer 15 is slidably mounted on the dirt collecting tank 14, the dirt collecting drawer 15 is used for collecting and processing the dirt, the dirt collecting drawer 15 is taken out to clean the dust when the filter screen 3 is in a filtering state, equipment is not required to be shut down during cleaning, maintenance time is shortened, working efficiency is improved, a guide plate which is attached to the sealing plate 33 and guides the discharged gas of the dirt collecting hole 141 to face the fan 13 and is close to one side of the processing cavity 12 is arranged on the shell 1, the guide plate extends to the rear side of the fan 13, and the air is prevented from entering the dirt collecting hole 141 end to affect the collection of sundries when the fan 13 blows.

In addition, a chemical filling filter 17 is arranged on the shell 1, and the chemical filling filter 17 is positioned on one side of the fan 13 away from the filter screen 3 and is used for chemically filtering the pretreated gas, removing harmful components and then discharging.

And a sealing member 2 for opening and closing according to the position of the filter screen 3 and limiting the entry of the sewage into the housing 1, and simultaneously changing the rotation direction of the fan 13 to blow the filter screen 3, wherein the sealing member 2 comprises a fixed plate 21 and a movable plate 22 which are connected with each other in a sliding manner and can be ventilated, and the fixed plate 21 and the movable plate 22 are dislocated to limit the entry of the sewage, and the fixed plate 21 and the movable plate 22 are flush under normal conditions, and after the filter screen 3 moves and the first air bag 324 is extruded by the magnet 323 and the electromagnet 325, the first air bag 324 provides power for the movable plate 22 to dislocate with the fixed plate 21, thereby closing the air inlet, and simultaneously changing the rotation direction of the fan 13 after the movable plate 22 moves.

Specifically, the fixed plate 21 is provided with a plurality of groups of vent holes 211 which are distributed equidistantly, the movable plate 22 is provided with a plurality of groups of vent holes 221 which are distributed equidistantly, the movable plate 22 is provided with a first conductive block 222 which is used for being communicated with an electromagnetic iron electrode plate 322 and a second conductive block 223 which is used for being connected with a fan electrode plate 131, the vent holes 211 and the vent holes 221 are communicated under normal conditions, after the filter screen 3 displaces and reaches a preset distance, the first conductive block 222 is contacted with the electromagnetic iron electrode plate 322 and starts an electromagnet 325, at the moment, the magnet 323 and the electromagnet 325 cooperate to enable the filter screen 3 to displace again, meanwhile, the movable plate 22 is lifted under the driving of the first air bag 324, the second conductive block 223 is contacted with the fan electrode plate 131 at a high position, so that the rotation direction of the fan 13 is changed, the bottom of the movable plate 22 is provided with an air bag 224 which is communicated with the first air bag 324, and the air leakage hole is arranged on the second air bag 224 is compressed, and then gas is led into the second air bag 224, so that the movable plate 22 is lifted, and the air in the air bag 224 is discharged.

Working principle: introducing the waste gas from the gas inlet 11 on the shell 1, leading the gas into two cavities in the shell 1 through the sealing element 2, discharging the gas from the treatment cavity 12 after treatment, aligning the fixed plate 21 and the movable plate 22 on the sealing element 2 with the first vent hole 211 and the second vent hole 221 in working condition, after the filter screen 3 filters the sundry particles for a long time, when the particles attached on the surface of the filter screen 3 can not fall down, the air permeability of the filter screen 3 is reduced along with the accumulation of the particles, thereby reducing the waste gas treatment capacity in unit time, reducing the filtration treatment efficiency, because a large amount of particles are attached on the surface of the filter screen 3, the wind resistance of the filter screen 3 is increased, the filter screen 3 slides on the inner wall of the shell 1, after the filter screen 3 moves and pushes the guide rod 32 to reach a preset distance, the electromagnetic iron electrode plate 322 on the guide rod 32 moves to the position of the sealing element 2 and contacts with the first conductive block 222, thereby the electromagnet 325 is electrified, the magnet 323 is pulled to enable the filter screen 3 to displace again, meanwhile, the first air bag 324 is extruded, the air in the first air bag 324 is extruded into the second air bag 224, the movable plate 22 is pushed to ascend, the second air holes 221 and the first air holes 211 are staggered when the movable plate 22 ascends, thus closing and preventing the sewage on one side from entering, meanwhile, when the movable plate 22 ascends, the second conductive block 223 moves and contacts with the upper fan electrode plate 131, thus changing the rotating direction of the fan 13, at the moment, the fan 13 blows towards the filter screen 3, when the filter screen 3 moves, the deflector rod 34 arranged on the filter screen 3 correspondingly moves and contacts with the rotating fan 13, thereby poking the filter screen 3 to vibrate, removing the particle impurities adsorbed on the surface of the filter screen 3, and the included angle between the cut filter screen 3 and the sealing piece 2 is smaller than 90 degrees because the filter screen 3 is obliquely arranged, dust particles are not easy to accumulate on the filter screen 3 when the filter screen 3 vibrates, cleaning is convenient, meanwhile, the sealing plate 33 arranged at the bottom of the filter screen 3 moves, the exhaust hole 331 is communicated with the dirt collecting hole 141 when the filter screen 142 is exposed, sundries enter the dirt collecting groove 14 through the filter screen 142 and are discharged into the treatment cavity 12 through the dirt collecting hole 141, the one-way air inlet valve and the one-way air outlet valve are arranged on the first air bag 324, the exhaust speed of the exhaust valve is higher than the air inlet speed of the air inlet valve, the one-way air inlet valve is arranged on one side of the first air bag 324 close to the electromagnet 325 and is used for preventing air from overflowing outside when the first air bag 324 is extruded, the one-way air outlet valve is arranged on the communicating part with the second air bag 224, the air in the second air bag 224 is prevented from being recooled into the first air bag 324, the movable plate 22 rises to lead the first conductive block 222 to be separated from the electromagnetic iron 322 after the air bag is inflated, the electromagnet 325 is powered off, the air bag 324 is automatically reset and sucked, the guide rod 32 is slowly reset, the reset speed is the same as the first air bag 324 is inflated, the movable plate 224 is slowly descends due to the air, and the guide rod 32 is reset before the movable plate 22 resets, the air bag is reset, the clean 3 is increased, the cleaning time is realized, the cleaning efficiency is improved, the time is kept regularly, the cleaning time is long, and the cleaning time is saved, and the time is convenient, and the cleaning time is saved.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; these modifications or substitutions do not depart from the essence of the corresponding technical solutions from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dry chemical filter, comprising:

a shell (1) for guiding the sewage gas into a plurality of cavities for treatment, wherein a plurality of fans (13) which guide the gas into and can rotate forward and backward are arranged on the shell (1);

the filter screen (3) is movably arranged on the shell (1) and positioned between the air inlet end and the fan (13) and is used for preprocessing air, the filter screen (3) is automatically cleaned after being displaced, guide rods (32) for guiding movement are arranged on two sides of the filter screen (3), a magnet (323) is arranged on one side, facing the fan (13), of the guide rods (32), an electromagnet (325) is correspondingly arranged on the shell (1), and an airbag I (324) is arranged between the magnet (323) and the electromagnet (325);

the sealing piece (2) is used for opening and closing according to the position change of the filter screen (3) and limiting the entry of the sewage into the shell (1), and simultaneously changing the rotating direction of the fan (13) to blow the filter screen (3), the sealing piece (2) comprises a fixed plate (21) and a movable plate (22) which are connected with each other in a sliding way and can be ventilated, and the fixed plate (21) and the movable plate (22) are staggered to limit the entry of the sewage.

2. A dry chemical filter according to claim 1, characterized in that the housing (1) is provided with an air inlet (11) and two sets of treatment chambers (12) which are both in communication with the air inlet (11), and the two sets of treatment chambers (12) are not in communication, and the filter screen (3) is located in the treatment chambers (12).

3. The dry chemical filter according to claim 1, wherein the inner wall of the housing (1) attached to the sealing member (2) is provided with two sets of fan electrode plates (131) electrically connected with the fan (13), and the two sets of fan electrode plates (131) are connected with the fan (13) in opposite directions.

4. A dry chemical filter according to claim 3, wherein the guide rod (32) is provided with an electromagnetic iron electrode plate (322) which is electrically connected with an electromagnet (325) at a side far away from the magnet (323) and close to the sealing member (2), an elastic member for resetting is arranged in the first air bag (324), a one-way air inlet valve and a one-way air outlet valve are arranged on the first air bag (324), and the air outlet speed of the air outlet valve is larger than the air inlet speed of the air inlet valve, so that the cleaning time of the filter screen (3) is increased.

5. The dry chemical filter according to claim 4, wherein the fixed plate (21) is provided with a plurality of groups of vent holes (211) which are distributed at equal intervals, the movable plate (22) is provided with a plurality of groups of vent holes (221) which are distributed at equal intervals, the movable plate (22) is provided with a first conductive block (222) for communicating an electromagnetic ferroelectric electrode plate (322) and a second conductive block (223) for connecting a fan electrode plate (131), the bottom of the movable plate (22) is provided with a second air bag (224) which is communicated with the first air bag (324), and the second air bag (224) is provided with a leakage hole.

6. The dry chemical filter according to claim 5, wherein the filter screen (3) is provided with a deflector rod (34), the housing (1) is provided with a guide ring (16) for guiding and preventing the deflector rod (34) from tilting, two sides of the filter screen (3) are provided with sliding rods (311) which are in sliding connection with the guide rods (32), and springs (321) are arranged between the sliding rods (311) and the guide rods (32) for reserving a vibration space when the fan (13) flaps the deflector rod (34) and shakes the filter screen (3).

7. The dry chemical filter according to claim 1, wherein the bottom of the filter screen (3) is provided with a sealing plate (33), the sealing plate (33) is provided with an exhaust hole (331), the corresponding part of the bottom of the shell (1) and the sealing plate (33) is provided with a dirt collecting groove (14) for collecting sundries, the dirt collecting groove (14) is provided with dirt collecting holes (141) and (142), the exhaust hole (331) is positioned between the dirt collecting holes (141) and (142), and the dirt collecting hole (141) is provided with a dustproof cloth bag.

8. A dry chemical filter according to claim 7, characterized in that the dirt collecting drawer (15) is slidably mounted on the dirt collecting tank (14), and a guide plate which is attached to the sealing plate (33) and guides the exhaust gas from the dirt collecting hole (141) to the side of the fan (13) close to the treatment chamber (12) is arranged on the housing (1).

9. A dry chemical filter according to claim 1, characterized in that the housing (1) is provided with a chemical filling filter (17), and that the chemical filling filter (17) is located on the side of the fan (13) remote from the filter screen (3).