CN219922419U

CN219922419U - Air filter

Info

Publication number: CN219922419U
Application number: CN202321322909.XU
Authority: CN
Inventors: 贾建东; 张爱健
Original assignee: Hangzhou Cobetter Filtration Equipment Co Ltd
Current assignee: Hangzhou Cobetter Filtration Equipment Co Ltd
Priority date: 2023-05-27
Filing date: 2023-05-27
Publication date: 2023-10-31
Anticipated expiration: 2033-05-27

Abstract

The utility model claims an air filter comprising: a frame including two side plates and two end plates to define a gas passage extending in a first direction; the filter membrane is arranged on the gas channel and is folded to form pleats; the pleats include peaks on the upstream side, valleys on the downstream side, and legs connecting the peaks and valleys; a spacer provided between adjacent legs of the pleat to maintain a spacing between the adjacent legs; a first seal member disposed between the end face of the filter membrane and the end plate; the second sealing piece is arranged between the side surface of the filter membrane and the side plate in an interference manner; the spacer having a longitudinal dimension less than the longitudinal dimension of the filter membrane to form a cavity between the first seal, the spacer and the filter membrane; the filter cotton is abutted to the first sealing piece to seal the gap between the filter membrane and the first sealing piece. Can ensure the effective filtration of the air filter.

Description

Air filter

Technical Field

The utility model belongs to the technical field of filtration, and particularly relates to an air filter.

Background

The plate and frame type air filter is used in the fields of circulating air purification of a dryer and the like, exhaust gas treatment of an incinerator, and filtration of high-temperature gas required for semiconductors. Chinese patent CN106334391B discloses a high efficiency air filter assembly for high temperature applications comprising: the filter core and the box-shaped metal frame are sealed by ceramic adhesive. In practical use, technicians find that due to the different thermal expansion coefficients of the metal frame, the ceramic glue and the filter element, a gap through which gas can directly pass is often generated between the metal frame and the ceramic glue when the temperature is raised, so that the sealing is invalid.

In response to the above problems, those skilled in the art replace ceramic glue with a high temperature resistant and flexible seal; structurally, the person skilled in the art wishes the seal to seal against the end of the filter membrane, but during actual use it is found that: the sealing element can generate the problem of wrinkling, and the filter membrane is easy to be pressed and deformed in the production, transportation and installation processes; therefore, when the filter membrane abuts against the sealing member, the problem that the gas to be filtered passes through the filter membrane directly without being filtered by the filter membrane occurs. In view of this, the present utility model has been proposed.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides the air filter which has good sealing performance, ensures that gas is effectively filtered in the using process and has good filtering effect.

The technical scheme adopted for solving the technical problems is as follows: an air filter, comprising:

a frame including two side plates and two end plates to define a gas passage extending in a first direction;

the filter membrane is arranged on the gas channel and is folded to form pleats; the pleats include peaks on the upstream side, valleys on the downstream side, and legs connecting the peaks and valleys;

a spacer provided between adjacent legs of the pleat to maintain a spacing between the adjacent legs;

a first seal member disposed between the end face of the filter membrane and the end plate;

the second sealing piece is arranged between the side surface of the filter membrane and the side plate in an interference manner;

the spacer having a longitudinal dimension less than the longitudinal dimension of the filter membrane to form a cavity between the first seal, the spacer and the filter membrane;

the filter cotton is abutted to the first sealing piece to seal the gap between the filter membrane and the first sealing piece.

The utility model uses the first sealing element to realize the sealing between the end face of the filter membrane and the end plate, uses the second sealing element to realize the sealing between the side face of the filter membrane and the side plate, and simultaneously sets filter cotton in a cavity formed among the first sealing element, the isolating element and the filter membrane; when the first sealing element generates folds in the production and use processes, the filter membrane is abutted on the first sealing element of the folds, gas can directly pass through gaps at the edges of the folds without being filtered by the filter membrane, and at the moment, the arrangement of the filter cotton can prevent the gas from directly passing through the gaps at the folds, so that all the gas is ensured to pass through the filter membrane or/and the filter cotton to achieve good filtering effect; meanwhile, the rigidity of the filter membrane is relatively low, when the filter membrane is propped against the first sealing piece, the filter membrane can also generate local deformation after being stressed, so that gas can directly pass through the deformation part without being filtered by the filter membrane, and at the moment, the filter cotton can prevent the gas from directly passing through a gap at the deformation part, and the filtering treatment of all the gas through the filter membrane or/and the filter cotton is ensured; and after the frame is heated and expanded in use, a gap is generated between the first sealing element and the filter membrane, and the filter cotton is arranged so that gas can not directly pass through the gap, but is filtered by the filter membrane or/and the filter cotton, thereby guaranteeing the final filtering effect.

Further, the filter cotton comprises a closed section correspondingly arranged on the crest and the valley, and an extension section integrally connected with two sides of the closed section; the projection surfaces of the extension sections of the adjacent filter cotton in the lateral direction are provided with overlapping parts.

The overlapping part prevents gas from passing through a gap between the end face of the filter membrane and the first sealing piece, ensures that all the gas flows to the downstream side after being filtered, and ensures good filtering effect.

Further, the longitudinal dimension of the filter cotton in the natural state is larger than that of the cavity.

When the filter cotton is assembled in the cavity, the filter cotton is in a compressed state, the filter cotton is guaranteed to be in sealing abutting connection with the first sealing piece, and the gap between the filter membrane and the first sealing piece is guaranteed to be effectively plugged.

Further, a pressing plate is arranged between the filter cotton and the end plate, and the first sealing piece is axially wound on the pressing plate by taking the first direction as the axial direction.

The pressure plate can provide a supporting function for the first sealing element; the first sealing element is axially wound on the pressing plate in the first direction D1, so that the first sealing element is prevented from being entangled by the stop element, the first sealing element is prevented from being torn by being pulled, and fragments of the first sealing element at the rear end of the stop element are prevented from falling and entering the downstream side of the gas channel; in addition, the first sealing piece is wound on the edges of the two sides of the pressing plate, so that interference fit can be formed between the first sealing piece and the second sealing piece, and the sealing performance of the joint of the end plate and the side plate is effectively improved; the cooling effect to the first sealing member can also be played when the louvre is seted up on the clamp plate, and air cleaner application environment temperature can be more than 300 ℃, and continuous high temperature will cause the glass transition of first sealing member faster even take place key fracture and carbonization etc. to the life of first sealing member can be improved to first sealing member cooling.

Further, the frame is correspondingly provided with first barrier strips at the upper and lower streams of the gas channel, and the first barrier strips and the two side plates are enclosed to form a first installation space; the projection surface of the first barrier strip in the first direction covers the filter cotton.

The filter cotton falls in first installation space completely, can avoid the filter cotton to break away from the preset position under the air current blows, guarantees its good sealed effect, and avoids the filter cotton to cause the drop of piece under the gas impact, guarantees good filter effect.

Further, the frame is correspondingly provided with a second barrier strip at the upper and the lower stream of the gas channel, and the second barrier strip and the two end plates are enclosed to form a second installation space; and the projection surface of the second barrier strip in the first direction covers the second sealing element.

The second sealing element falls in the second installation space completely, so that the second sealing element can be prevented from being separated from a preset position under the blowing of air flow, the good sealing effect is ensured, the falling of fragments caused by the impact of the air on the second sealing element is avoided, and the good filtering effect is ensured.

Further, the second sealing element is V-shaped, the side wall of the second sealing element is attached to the side plate for sealing, and the starting end and the tail end of the filter membrane extend into the second sealing element.

The second sealing element is in a V shape, two side walls of the second sealing element can be respectively attached to the side plates and the isolating element, one side wall of the second sealing element is attached to the side plates for sealing, so that air flow is prevented from directly passing through a gap between the second sealing element and the side plates, and good filtering effect is ensured; the starting end and the tail end of the filter membrane extend into the closed end of the second sealing element, so that sealing fit between the filter membrane and the second sealing element can be realized, and air flow is prevented from directly passing through a gap near the end part of the filter membrane.

Further, the surface of the second sealing piece is contacted with the filter cotton to form a seal; and/or, the end face of the second sealing piece is contacted with the first sealing piece to form a seal.

The second sealing member contacts with the side surface of the extension section of the filter cotton to form a seal, and/or the upper end surface and the lower end surface of the second sealing member contact with the first sealing member to form a seal, so that good sealing can be formed on the periphery of the frame, better filtering effect is guaranteed, and poor filtering effect caused by the heated deformation of the frame is avoided.

Further, a longitudinally extending support plate is further arranged in the frame, and two longitudinal ends of the support plate are propped against the first sealing piece.

The backup pad can keep the distance between the frame both ends board, avoids the filter membrane to be crushed by the clamp plate at both ends in third direction D3, has had the support of backup pad in the transportation, and the filter membrane is difficult for receiving external force effect and damage in the transportation.

Further, a pressing plate is arranged between the filter membrane and the end plate; the support plate includes a main body portion and protruding portions located at both ends of the main body portion in a third direction, the protruding portions being abutted against an upstream side end face of the platen.

The bulge and the pressing plate are propped against each other to prevent the support plate from moving towards the downstream side and prevent the support plate from moving towards the downstream direction to damage the filter membrane.

The beneficial effects of the utility model are as follows: a filter cotton is arranged in a cavity formed among the first sealing piece, the isolating piece and the filter membrane; when the first sealing element generates folds in the production and use processes, the arrangement of the filter cotton can prevent gas from directly passing through gaps at the folds, so that all the gas is ensured to pass through the filter membrane or/and the filter cotton to achieve good filtering effect; meanwhile, the rigidity of the filter membrane is relatively low, when the filter membrane is propped against the first sealing piece, the filter membrane can also generate local deformation after being stressed, and the filter cotton can avoid the gas to directly pass through a gap at the deformation part, so that the filtering treatment of all the gas through the filter membrane or/and the filter cotton is ensured; in addition, after the frame is heated and expanded in use, a gap is generated between the first sealing element and the filter membrane, and the arrangement of the filter cotton ensures that the gas is filtered by the filter membrane or/and the filter cotton, so that the filtering effect is good; the first sealing element is wound on the pressing plate, so that the first sealing element can be supported and cooled, and the service life of the first sealing element is prolonged; the first sealing element is axially wound on the pressing plate in the first direction D1, so that the first sealing element is prevented from being torn by being pulled, and fragments of the first sealing element are prevented from falling down and entering the downstream side of the gas channel; in addition, the first sealing piece is wound on the edges of the two sides of the pressing plate, so that interference fit can be formed between the first sealing piece and the second sealing piece, and the sealing performance of the joint of the end plate and the side plate is effectively improved; the filter cotton falls in first installation space completely, the second sealing member falls in the second installation space completely, can avoid filter cotton, second sealing member to break away from the preset position under the air current blows, guarantees its good sealed effect, and avoids filter cotton, second sealing member to cause the drop of piece under the gas impact, guarantees good filter effect.

Drawings

Fig. 1 is a schematic view of a partial structure of the present utility model.

Fig. 2 is a schematic view of the back structure of the present utility model.

FIG. 3 is a schematic view of the structure of the utility model with the frame removed.

FIG. 4 is a schematic view of the structure of the present utility model with the frame, platen, and upper first seal removed.

FIG. 5 is a schematic diagram of the mating structure of the filter membrane and the second seal member of the present utility model.

Fig. 6 is a schematic diagram of the mating structure of the filter membrane, the filter plug and the second seal member of the present utility model.

Fig. 7 is a top view of the mating structure of the filter membrane, the filter plug and the second seal member of the present utility model.

Fig. 8 is a top view of the filter plug of the present utility model.

Fig. 9 is a top view of the utility model with the frame, second seal removed.

Fig. 10 is a cross-sectional view AA of fig. 9.

FIG. 11 is a schematic view of the cooperation structure of the platen and the support plate according to the present utility model.

Fig. 12 is an enlarged view of the structure at B in fig. 11.

FIG. 13 is a schematic view showing a structure in which the first seal member is wound around the pressing plate in the present utility model.

Fig. 14 is an enlarged view of the structure at C in fig. 13.

Fig. 15 is a side view of the first seal of the present utility model wrapped around a platen.

The device comprises a 1-frame, 11-side plates, 12-end plates, 13-first baffle strips, 14-first installation space, 15-second baffle strips, 16-second installation space, 17-supporting plates, 171-main body parts, 172-protruding parts, 2-gas passages, 3-filter membranes, 31-folds, 311-fold peaks, 312-fold valleys, 313-legs, 32-filter membrane starting ends, 33-filter membrane tail ends, 4-isolating pieces, 5-first sealing pieces, 6-second sealing pieces, 7-cavities, 8-filter cottons, 81-sealing pieces, 82-extending pieces, 83-overlapping parts, 9-pressing plates, 91-heat dissipation holes, 92-blocking pieces, D1-first directions, D2-second directions and D3-third directions.

Detailed Description

In order to make the present utility model better understood by those skilled in the art, the following description of the technical solutions of the present utility model will be made in detail, but not all embodiments of the present utility model are apparent to some embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

An air filter comprises a frame 1, a filter membrane 3, a spacer 4, a first seal 5, a second seal 6, and a filter plug 8. As shown in fig. 1, the frame 1 is made of stainless steel, and includes two side plates 11 and two end plates 12, the two side plates 11 are parallel to each other in a vertical direction, and the two end plates 12 are parallel to each other in a parallel direction, so that the two side plates 11 and the two end plates 12 define a gas channel 2 with a square frame-shaped boundary, the extending direction of the gas channel 2 is defined as a first direction D1 in fig. 1, an inlet side of the gas is an upstream side of the gas channel 2 (hereinafter, an upstream side is an upstream side of the gas channel 2), and an outlet side of the gas is a downstream side of the gas channel 2 (hereinafter, a downstream side is a downstream side of the gas channel 2).

As shown in fig. 2-5, the filter membrane 3 is arranged on the gas channel 2, which may be of glass fibre material, and the filter membrane 3 is folded to form pleats 31, and the pleats 31 extend between the side plates 11 in the second direction D2 in fig. 1. The pleats 31 include pleats on the upstream side of the gas passage 2

1. The valleys 312 on the downstream side of the gas passage 2 and the legs 313 connecting the crests 311 and the valleys 312.

The spacers 4 are disposed between adjacent legs 313 of the pleats 31 so that the spacing between adjacent legs 313 is maintained to avoid adjacent legs 313 from approaching or even conforming to each other. The longitudinal dimension of the spacer 4 is smaller than the longitudinal dimension of the filter membrane 3, thereby forming a cavity 7 between the first seal 5, the spacer 4 and the filter membrane 3. The third direction D3 in fig. 1 is defined herein as a longitudinal direction, and the third direction D3, the first direction D1, and the second direction D2 are perpendicular to each other. In this embodiment, the spacers 4 are made of aluminum foil, which are disposed between the adjacent legs 313 of each pleat 31 and are bent to form waves to ensure the effective filtering area of the filter membrane 3.

The first sealing member 5 is disposed between the end face of the filter membrane 3 and the end plate 12, and may be disposed between the upper end face of the filter membrane 3 and the upper end plate, or may be disposed between the lower end face of the filter membrane 3 and the lower end plate, or may be disposed between the upper end face of the filter membrane 3 and the upper end plate, or may be disposed between the lower end face of the filter membrane 3 and the lower end plate, without being limited in particular. In this embodiment, the first sealing member 5 may be glass fiber wool, or may be other sealing materials resistant to high temperatures.

The second sealing member 6 is disposed between the side surface of the filter membrane 3 and the side plate 11 in an interference fit manner, and may be disposed between the left side surface of the filter membrane 3 and the left side plate, or may be disposed between the right side surface of the filter membrane 3 and the right side plate in an interference fit manner, or may be disposed between the left side surface of the filter membrane 3 and the left side plate in an interference fit manner, or may be disposed between the right side surface of the filter membrane 3 and the right side plate in an interference fit manner, which is not particularly limited. In this embodiment, the second sealing member 6 may be glass fiber wool, or may be other sealing materials resistant to high temperatures.

The filter plug 8 is arranged in the cavity 7, and the filter plug 8 abuts against the first sealing member 5 so that a gap between the filter membrane 3 and the first sealing member 5 can be blocked. When the first sealing element 5 generates folds in the production and use processes, the filter membrane 3 is abutted to the first sealing element 5 of the folds, gas can directly pass through gaps at edges of the folds without being filtered by the filter membrane 3, and at the moment, the filter cotton 8 is arranged in the cavity 7, so that the gas can be prevented from directly passing through the gaps at the folds, and all the gas is ensured to pass through the filter membrane 3 or/and the filter cotton 8 for filtering treatment, so that a good filtering effect is achieved. Meanwhile, the rigidity of the filter membrane 3 is relatively low, when the filter membrane 3 is propped against the first sealing piece 5, the filter membrane 3 can also generate local deformation after being stressed, so that gas can directly pass through the deformation part without being filtered by the filter membrane 3, and at the moment, the filter cotton 8 can avoid the gas to directly pass through a gap at the deformation part, so that the filtering treatment of all the gas through the filter membrane 3 and/or the filter cotton 8 is ensured. Also, when the frame 1 expands in use by heat, a gap is created between the first seal 5 and the filter membrane 3, through which gas does not pass directly, but rather is subjected to a filtration treatment by the filter membrane 3 and/or the filter plug 8.

The filter cotton 8 can be a material which plays a role in filtering, and the filter cotton 8 assists the filter membrane 3 to realize a filtering function on gas; of course, the filter element 8 may be a material which does not perform a filtering function, but only performs a sealing function, and at this time, the gas can flow to the position of the filter membrane 3 under the blocking of the filter element 8 to continue filtering. In this embodiment, the filter plug 8 may be glass fiber cotton or PI yellow cotton with high temperature resistance.

As shown in fig. 6 to 8, the filter element 8 includes a closed section 81 and extension sections 82 integrally connected to both sides of the closed section 81, the closed section 81 is correspondingly disposed on the crests 311 and troughs 312 of the filter membrane 3, and the projection surfaces of the extension sections 82 of adjacent filter elements 8 in the lateral direction have overlapping portions 83. In other words, the outer wall of the closed end 81 is attached to the side walls of the crests 311 and troughs 312, and the extension length of the extension 82 of the filter element 8 in the first direction D1 exceeds the end of the adjacent other filter element 8, so that the extension 82 of the adjacent filter element 8 overlaps in the first direction D1, thereby avoiding the passage of gas between the end face of the filter membrane 3 and the first seal member 5, and ensuring that all the gas passing through the gap flows to the downstream side after being filtered by the filter element 8.

In this embodiment, the cross section of the filter element 8 is V-shaped, and the extension 82 thereof is attached to the leg 313 of the filter membrane 3. Of course, in other embodiments, the cross section of the filter element 8 may be U-shaped or any other shape. Two filter elements 8 are provided in the crests 311 and troughs 312 of one pleat 31, and the closed segments 81 of the filter elements 8 located in the crests 311 are located on the upstream side and the closed segments 81 of the filter elements 8 located in the troughs 312 are located on the downstream side. Preferably, the cotton filter 8 is elastically biased against the peaks 311, valleys 312 and legs 313 of the filter membrane.

The longitudinal dimension of the filter element 8 in the natural state is greater than the longitudinal dimension of the cavity 7, in other words, when the filter element 8 is assembled in the cavity 7, it is in a compressed state, ensuring that the filter element 8 is in sealing abutment against the first sealing element 5, and ensuring that the gap between the filter membrane 3 and the first sealing element 5 is effectively blocked.

The frame 1 is provided with a first barrier strip 13 correspondingly at the upstream and downstream of the gas channel 2, the first barrier strip 13 extends along the whole length direction of the second direction D2 of the frame 1, the first barrier strip 13 and the two side plates 11 are enclosed to form a first installation space 14, the projection surface of the first barrier strip 13 in the first direction D1 covers the filter cotton 8, in other words, the filter cotton 8 falls in the first installation space 14 completely, and the height of the filter cotton 8 does not exceed the first barrier strip 13. The filter cotton 8 is arranged in the first installation space 14, so that the filter cotton 8 can be prevented from being separated from a preset position under the blowing of air flow, the good sealing effect is ensured, the filter cotton 8 is prevented from falling off of chips caused by the impact of air, and the good filtering effect is ensured.

As shown in fig. 9 and 10, in the present embodiment, the first seals 5 are provided between the upper end plate 12 and the filter membrane 3 of the frame 1, and between the lower end plate 12 and the filter membrane 3, and the cavities 7 are formed, and then the filter elements 8 are provided. The number of first bars 13 is thus also two and the number of first installation spaces 14 is also two. More specifically, the bottom surface of the first barrier rib 13 near the upper end plate 12 is located below the lower bottom surface of the filter element 8, and the top surface of the first barrier rib 13 near the lower end plate 12 is located above the upper top surface of the filter element 8.

As shown in fig. 3 and 5-7, the second sealing member 6 is V-shaped, the side wall of the second sealing member is sealed with the side plate 11 in a fitting manner, and the starting end 32 and the end 33 of the filter membrane 3 extend into the second sealing member 6. The second seal 6 extends along the third direction D3 for the entire height direction between the upper and lower end plates of the frame 1. The surface of the second seal 6 contacts the plug 8 to form a seal, and in particular contacts the side of the extension 82 of the plug 8. The side surface of the second sealing member 6 contacts with the first sealing member 5 to form a seal, and in this embodiment, the upper end surface and the lower end surface of the second sealing member 6 may contact with the first sealing member 5 to form a seal. The second sealing member 6 may form a contact seal with both the filter plug 8 and the first sealing member 5, or may form a contact seal with only the filter plug 8, or may form a contact seal with only the first sealing member 5.

The frame 1 is correspondingly provided with a second barrier strip 15 at the upstream and downstream of the gas channel 2, the second barrier strip 15 extends along the whole height direction along the third direction D3 of the frame 1, the second barrier strip 15 and the two end plates 12 are enclosed to form a second installation space 16, the projection surface of the second barrier strip 15 in the first direction D1 covers the second sealing element 6, in other words, the second sealing element 6 falls in the second installation space 16 completely, and the width of the second sealing element 6 does not exceed the second barrier strip 15. The second sealing element 6 is arranged in the second installation space 16, so that the second sealing element 6 can be prevented from being separated from a preset position under the blowing of air flow, the good sealing effect is ensured, and the falling of chips caused by the impact of air on the second sealing element 6 is avoided, and the good filtering effect is ensured.

As shown in fig. 3, 10 to 15, a pressing plate 9 is disposed between the filter element 8 and the end plate 12, and the first seal member 5 is wound around the pressing plate 9 in the first direction D1. The pressing plate 9 can provide effective support for the first sealing member 5, and in this embodiment, a plurality of heat dissipation holes 91 are formed in the pressing plate 9, so as to perform a cooling function on the first sealing member 5. The application environment temperature of the air filter can exceed 300 ℃, the continuous high temperature can cause the glass transition of the first sealing element 5 to be faster, even key breakage, carbonization and the like, the heat dissipation holes 91 are formed in the pressing plate 9 to play a role of a heat dissipation plate, the first sealing element 5 can be cooled on the premise of providing support for the first sealing element 5, and the service life of the first sealing element 5 is prolonged.

The platen 9 has a stopper 92 on the downstream side of the filter membrane 3, and the spacer 4 protrudes from the filter membrane 3 in the first direction D1 and can abut against the stopper 92. During operation, the filter membrane 3 is blown by the air flow to move in the downstream direction, and after the spacer 4 abuts against the stop member 92, the filter membrane 3 is prevented from flowing further downstream, so that the filter membrane 3 is prevented from being separated from the frame 1. At the same time, the stop 92 also prevents the first seal 5 from coming off the pressure plate 9 after a long period of use. Of course, in other embodiments, the stop 92 may be provided on the downstream side of the end plate 12.

Since the first sealing member 5 is wound around the pressing plate 9 in the first direction D1, the first sealing member 5 is prevented from being entangled by the stopper 92, the first sealing member 5 is prevented from being torn by being pulled, and the fragments of the first sealing member 5 at the rear end of the stopper 92 are prevented from falling off and entering the downstream side of the gas passage 2; in addition, the first sealing piece 5 is wound on the two side edges of the pressing plate 9, so that interference fit can be formed between the first sealing piece 5 and the second sealing piece 6, and the sealing performance of the joint of the end plate 12 and the side plate 11 is effectively improved.

In order to avoid crushing of the filter membrane 3 in the third direction D3 by the pressure plates 9 at both ends, a longitudinally extending support plate 17 is also provided in the frame 1, the longitudinal ends of the support plate 17 being arranged against the first seal 5. In other words, the support plate 17 extends in the third direction D3 over the entire height direction of the frame 1 until it abuts against the first seal 5, and the support plate 17 can maintain the distance between the end plates 12 of the frame 1.

In order to avoid displacement of the support plate 17, the support plate 17 includes a main body 171 and protrusions 172 at both ends of the main body 171 in the third direction D3, and the protrusions 171 are abutted against the upstream side end surface of the platen 9, that is, the support plate 17 is not moved downstream by the obstruction of the platen 9, and damage to the filter membrane 3 due to movement of the support plate 17 in the downstream direction is avoided.

The foregoing detailed description is provided to illustrate the present utility model and not to limit the utility model, and any modifications and changes made to the present utility model within the spirit of the present utility model and the scope of the appended claims fall within the scope of the present utility model.

Claims

1. An air filter, comprising:

it is characterized in that the method comprises the steps of,

2. An air filter according to claim 1, wherein: the filter cotton comprises a closed section correspondingly arranged on the crest and the valley, and extension sections integrally connected with two sides of the closed section; the projection surfaces of the extension sections of the adjacent filter cotton in the lateral direction are provided with overlapping parts.

3. An air filter according to claim 1 or 2, wherein: the longitudinal dimension of the filter cotton in the natural state is larger than that of the cavity.

4. An air filter according to claim 2, wherein: a pressing plate is arranged between the filter cotton and the end plate, and the first sealing piece is axially wound on the pressing plate by taking the first direction as the axial direction.

5. An air filter according to claim 1, wherein: the frame is provided with first barrier strips corresponding to the upper and lower streams of the gas channel, and the first barrier strips and the two side plates are surrounded to form a first installation space; the projection surface of the first barrier strip in the first direction covers the filter cotton.

6. An air filter according to claim 5, wherein: the frame is correspondingly provided with second barrier strips at the upper and lower streams of the gas channel, and the second barrier strips and the two end plates are enclosed to form a second installation space; and the projection surface of the second barrier strip in the first direction covers the second sealing element.

7. An air filter according to claim 1 or 6, wherein: the second sealing piece is V-shaped, the side wall of the second sealing piece is attached to the side plate for sealing, and the starting end and the tail end of the filter membrane extend into the second sealing piece.

8. An air filter according to claim 1, wherein: the surface of the second sealing piece is contacted with the filter cotton to form a seal; and/or, the end face of the second sealing piece is contacted with the first sealing piece to form a seal.

9. An air filter according to claim 1, wherein: and a longitudinally extending supporting plate is also arranged in the frame, and two longitudinal ends of the supporting plate are propped against the first sealing piece.

10. An air filter according to claim 9, wherein: a pressing plate is arranged between the filter membrane and the end plate; the support plate includes a main body portion and protruding portions located at both ends of the main body portion in a third direction, the protruding portions being abutted against an upstream side end face of the platen.