A box-type air filter

Abstract

The present invention provides a box-type air filter, which relates to the technical field of box-type filters and includes an outer frame, an inner frame, a filter plate, a mounting mechanism and an adjusting mechanism. One side of the outer frame and the inner frame close to each other is fixedly connected. The filter plate is located inside the inner frame. A protective frame is installed on the surface of the outer frame. The adjusting mechanism is located at the position corresponding to the filter plate on the side wall of the inner frame. The adjusting mechanism includes two fixed rails and an adjusting block. The two fixed rails are respectively located on both sides of the inner wall of the inner frame, and one side of the fixed rail is fixedly connected to the surface of the side wall of the inner frame. In the present invention, during the long-term use of the box-type high-efficiency air filter, it will be necessary to disassemble and clean the filter plate inside the filter. Since the usual filter plates are mostly integrated, after the filter plate is disassembled and replaced, it will be inconvenient to install and adjust the filter plate.

Description

Technical Field

[0001] The present invention relates to the technical field of box filters, and particularly to a box air filter. Background Art

[0002] An air filter is a device that captures dust from a gas-solid two-phase flow through the action of a porous filter material and purifies the gas. A box high-efficiency air filter is a high-efficiency air purification device commonly used in industrial, laboratory, clean room and other environments to remove tiny particles, pollutants and harmful substances in the air and provide clean air. Its structure usually includes a sealed box body and high-efficiency filter media, which can effectively capture particles with a diameter of 0.3 microns and above, and the filtration efficiency usually reaches 99.97% or higher, which is relatively common in daily life.

[0003] Existing technologies such as the invention with the publication number CN112791532A disclose a box air filter. The patent includes a filter body. Inside the filter body, there is a filter inner box. Inside the filter inner box, several filter plates are installed. One end of the filter inner box is provided with an air inlet pipe, and the other end is provided with an air outlet pipe. A cooling groove is provided between the filter body and the filter inner box. The top of the filter body is provided with a heat dissipation plate, and a cooling machine box is installed on the top of the heat dissipation plate. A fan is installed inside the cooling machine box. The bottom of the filter body is installed with shock-absorbing rods, shock-absorbing springs are sleeved on the shock-absorbing rods, and a support frame is installed at the bottom of the shock-absorbing rods. This box air filter has strong flexibility and stability, is convenient for people to disassemble and assemble, can quickly filter the air, and can also perform heat exchange on the hot air during filtration, thereby reducing the air temperature, has strong functionality, and is convenient for people to operate and use.

[0004] In daily use, it is found that during the long-term use of a box high-efficiency air filter, it will be necessary to disassemble and clean the filter plates inside the filter. Since most common filter plates are integrated, after disassembling and replacing the filter plates, there will be problems in inconvenient installation and adjustment of the filter plates. Summary of the Invention

[0005] The purpose of the present invention is to solve the disadvantages in the prior art that during the long-term use of a box high-efficiency air filter, it will be necessary to disassemble and clean the filter plates inside the filter. Since most common filter plates are integrated, after disassembling and replacing the filter plates, there will be problems in inconvenient installation and adjustment of the filter plates.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A box-type air filter includes an outer frame, an inner frame, a filter plate, a mounting mechanism, and an adjusting mechanism. One side of the outer frame and the inner frame that are close to each other is fixedly connected. The filter plate is located inside the inner frame. A protective frame is installed on the surface of the outer frame. The adjusting mechanism is located at the position of the inner frame side wall corresponding to the filter plate. The adjusting mechanism includes two fixed rails and an adjusting block. The two fixed rails are respectively located on both sides of the inner wall of the inner frame. One side of the fixed rail is fixedly connected to the surface of the side wall of the inner frame. A plurality of fixed rods are slidably connected to the inner wall of the fixed rail. Every two of the plurality of fixed rods form a group. The cross-section of the fixed rod is in the shape of a "T". A fixed shaft is threadedly connected to the arc surface of the fixed rod. A fixed block is slidably connected to the arc surface of the fixed rod. A slot is opened on the upper end surface of the adjusting block. The inner wall of the slot is inserted into the arc surface of the fixed rod. The inner walls of each group of the adjusting block and the fixed block are clamped with the two side corners of the filter plate. One end surface of the inner frame away from the outer frame is fixedly connected to a support plate by means of a mounting mechanism. A sliding rod is fixedly connected to the surface of the support plate. One end surface of the filter plate away from the outer frame abuts against a support frame. Two pulley frames are fixedly connected to both sides of the lower surface of the support frame. The inner wall of the pulley frame is slidably connected to the arc surface of the sliding rod.

[0007] Preferably, the upper end cross-section of the fixed block is in the shape of a "U", the lower end cross-section of the fixed block is in the shape of an "L", the upper end cross-section of the adjusting block is in the shape of an "L", and both the fixed block and the adjusting block are made of cemented carbide blocks.

[0008] Preferably, a scale is provided on the surface of the fixed rail, and the scale corresponds to the positions of the fixed block and the adjusting block.

[0009] Preferably, the cross-section of the slot is in the shape of a "U", and a connecting strip is fixedly connected to the inner wall surface of the slot. The connecting strip is a rubber strip.

[0010] Preferably, the mounting mechanism is arranged on both sides of the bottom end of the inner frame. The mounting mechanism includes a mounting frame. One side of the mounting frame is fixedly connected to the side wall of the bottom end of the inner frame. A connecting rod is fixedly penetrated through the surface of the mounting frame. Both ends of the arc surface of the connecting rod are slidably connected with a connecting block. The cross-section of the connecting block is in the shape of an "L". Limit holes are opened on both end surfaces of the support plate. The surface of the connecting block slidably penetrates through the inner wall of the limit hole. The short arm end of the connecting block is clamped with the surface of the support plate. A spring is sleeved on the arc surface of the connecting rod. Both ends of the spring are fixedly connected to the connecting block and the mounting frame respectively.

[0011] Preferably, two limit blocks are fixedly connected to the positions of both end surfaces of the support plate corresponding to the connecting block. The cross-section of the limit block is in the shape of an "L", and the inner wall of the limit block is inserted into the surface of the connecting block.

[0012] Preferably, a connecting plate is fixedly connected to the side wall of the connecting block, and anti-slip patterns are provided on the surface of the connecting plate.

[0013] Preferably, a positioning mechanism is provided at the position corresponding to the protective frame on the surface of the four corners of the outer frame. The positioning mechanism includes a positioning post, the bottom end of the positioning post is fixedly connected to the surface of the outer frame, a positioning block is movably connected to the arc surface of the positioning post, the cross section of the positioning block is in a "one" shape, a tension spring is sleeved on the arc surface of the positioning post, and both ends of the tension spring are fixedly connected to the positioning block and the positioning post respectively. A through hole is provided on the surface of the protective frame corresponding to the positioning post, the inner wall of the through hole is slidably connected to the surface of the positioning block, and a card slot is provided on the surface of the protective frame corresponding to the through hole, and the cross-sectional size of the card slot is adapted to the cross-sectional size of the positioning block.

[0014] Preferably, the same auxiliary rod is rotatably connected to the two side surfaces of the positioning block, and the cross section of the auxiliary rod is in a "U" shape.

[0015] Preferably, extrusion pads are fixedly connected to the surfaces of the four sides of the protective frame close to the inner frame, a protective ring is fixedly connected to the position of the protective frame corresponding to the positioning post, and one sides of the protective ring and the extrusion pads are both abutted against the inner wall surface of the outer frame.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows.

[0017] 1. In the present invention, by setting the adjustment mechanism, the position of the filter plate inside the inner frame can be adjusted, which is convenient for disassembling and cleaning the filter plate after long-term use, and then adjusting and fixing it with the help of the adjustment mechanism, so as to contribute to the efficient and convenient air filtration operation of the filter plate in the inner frame.

[0018] 2. In the present invention, by setting the installation mechanism, the installation limit of the position of the support plate at the bottom end of the inner frame can be realized, which is convenient for supporting and protecting the filter plate in the inner frame, avoiding the situation that the filter plate loosens and falls off, and using the connecting block sliding at both ends of the connecting rod on the surface of the mounting rack to insert and fix the support plate.

[0019] 3. In the present invention, by setting the positioning mechanism, it is convenient to quickly fix and limit the position of the protective frame. Using the positioning block movably arranged on the arc surface of the positioning post to insert into the card slot opened on the surface of the protective frame, the protective frame can be quickly fixed. At the same time, when replacing and using the filter plate, the protective frame can be used for further protection operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of a box-type air filter proposed by the present invention;

[0021] Figure 2 This figure shows a partial schematic view of the three-dimensional structure of a box-type air filter proposed by the present invention;

[0022] Figure 3 This figure shows a schematic view of the disassembled structure of the three-dimensional structure of a box-type air filter proposed by the present invention;

[0023] Figure 4 This figure shows a schematic view of the structure of the adjustment mechanism of a box-type air filter proposed by the present invention;

[0024] Figure 5 This figure shows a schematic view of the disassembled structure of the adjustment mechanism of a box-type air filter proposed by the present invention;

[0025] Figure 6 This figure shows a partial schematic view of the structure of the adjustment mechanism of a box-type air filter proposed by the present invention;

[0026] Figure 7 This figure shows a schematic view of the structure of the installation mechanism of a box-type air filter proposed by the present invention;

[0027] Figure 8 This figure shows a schematic view of the structure of the positioning mechanism of a box-type air filter proposed by the present invention;

[0028] Figure 9 This figure shows a partial schematic view of the structure of the positioning mechanism of a box-type air filter proposed by the present invention.

[0029] Legend: 1. Outer frame; 2. Inner frame; 3. Protective frame; 4. Filter plate; 5. Adjustment mechanism; 501. Fixed rail; 502. Fixed rod; 503. Fixed shaft; 504. Fixed block; 505. Adjustment block; 506. Slot; 507. Connecting bar; 508. Scale; 509. Support plate; 510. Support frame; 511. Slide bar; 512. Pulley frame; 6. Installation mechanism; 61. Installation frame; 62. Connecting rod; 63. Connecting block; 64. Connecting plate; 65. Spring; 66. Limit block; 67. Limit hole; 7. Positioning mechanism; 71. Positioning column; 72. Through hole; 73. Card slot; 74. Positioning block; 75. Tension spring; 76. Auxiliary rod; 77. Extrusion pad; 78. Protective ring. Detailed implementation manners

[0030] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0031] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways different from those described herein. Therefore, the present invention is not limited by the limitations of the specific embodiments disclosed in the following specification.

[0032] Embodiment 1, as Figures 1-3 shown, the present invention provides a box - type air filter, including an outer frame 1, an inner frame 2, a filter plate 4, a mounting mechanism 6, and an adjusting mechanism 5. The outer frame 1, the inner frame 2, and multiple filter plates 4 are assembled into a box - type air filter. During the use of the entire box - type air filter, there will be a situation where it is necessary to disassemble, clean, and replace multiple filter plates 4 in the inner frame 2. During this process, first, the protective frame 3 on the surface of the outer frame 1 is disassembled by means of a positioning mechanism 7. Through the clamping and limiting protection between the positioning block 74 sliding on the surface of the positioning column 71 and the card slot 73 on the surface of the protective frame 3, the position of the protective frame 3 can be quickly adjusted. Then, the filter plate 4 is replaced, fixed, and limited by means of the adjusting mechanism 5. The filter plate 4 is placed into the inner frame 2, and then by moving the fixing rod 502 in the fixed rails 501 on both sides of the inner wall of the inner frame 2, the fixing rod 502 drives the adjusting block 505 to be limited in position with the fixing block 504, so that the adjusting block 505 and the fixing block 504 clamp and fix the four corners of the filter plate 4. At the same time, the bottom end of the filter plate 4 is supported and protected by the support frame 510 sliding along the sliding rod 511 on the surface of the support plate 509, so that the entire filter plate 4 is stably installed inside the inner frame 2. At the same time, when fixing the position of the support plate 509, it will be necessary to use the mounting mechanism 6 to limit the support plate 509. The connecting block 63 sliding at both ends of the connecting rod 62 penetrates through the limiting hole 67 opened on the surface of the support plate 509, and the short - arm end of the connecting block 63 is used for clamping and fixing operation on the surface of the support plate 509.

[0033] Next, specifically describe the specific settings and functions of its adjusting mechanism 5, mounting mechanism 6, and positioning mechanism 7.

[0034] As Figure 4 、 Figure 5 and Figure 6As shown, the adjusting mechanism 5 includes two fixed rails 501 and adjusting blocks 505. The fixed rails 501 can limit the horizontal movement of the position of the filter plate 4. The two fixed rails 501 are respectively located on both sides of the inner wall of the inner frame 2. One side of the fixed rail 501 is fixedly connected to the side wall surface of the inner frame 2. A number of fixed rods 502 are slidably connected to the inner wall of the fixed rail 501. The fixed rods 502 can limit the docking position of the adjusting block 505 and the fixed block 504. Every two of the number of fixed rods 502 form a group. The cross-section of the fixed rod 502 is in a "T" shape. A fixed shaft 503 is threadedly connected to the arc surface of the fixed rod 502. The fixed shaft 503 can limit the extrusion of the adjusting block 505 and the fixed block 504. A fixed block 504 is slidably connected to the arc surface of the fixed rod 502. The fixed block 504 and the adjusting block 505 can limit the clamping of the surface of the filter plate 4. A slot 506 is opened on the upper end surface of the adjusting block 505. The slot 506 can protect the docking position of the adjusting block 505. The inner wall of the slot 506 is inserted into the arc surface of the fixed rod 502. The inner walls of each group of adjusting blocks 505 and fixed blocks 504 are clamped to the surface of the two side corners of the filter plate 4. One end surface of the inner frame 2 away from the outer frame 1 is fixedly connected to a support plate 509 by means of a mounting mechanism 6. The support plate 509 can support and limit the bottom end of the filter plate 4. A slide bar 511 is fixedly connected to the surface of the support plate 509. The slide bar 511 can drive the support frame 510 to adjust the position. One end surface of the filter plate 4 away from the outer frame 1 abuts against the support frame 510. The support frame 510 can clamp and fix the filter plate 4. Two sides of the lower surface of the support frame 510 are fixedly connected to pulley frames 512. The pulley frames 512 can facilitate the adjustment of the position of the support frame 510. The inner wall of the pulley frame 512 is slidably connected to the arc surface of the slide bar 511. The upper end cross-section of the fixed block 504 is in a "U" shape, and the bottom end cross-section of the fixed block 504 is in an "L" shape. The upper end cross-section of the adjusting block 505 is in an "L" shape. Both the fixed block 504 and the adjusting block 505 are made of cemented carbide blocks. A scale 508 is provided on the surface of the fixed rail 501. The scale 508 can control the distance between the filter plates 4. The scale 508 corresponds to the positions of the fixed block 504 and the adjusting block 505. The cross-section of the slot 506 is in a "U" shape. A connecting strip 507 is fixedly connected to the inner wall surface of the slot 506. The connecting strip 507 can increase the friction and facilitate better fixing and limiting of the adjusting block 505. The connecting strip 507 is a rubber strip.

[0035] After the filter plate 4 has been operated and used for a long time, the filter plate 4 is replaced and cleaned and then docked and limited inside the inner frame 2. At this time, the fixing rod 502 moving on the inner wall of the moving fixed rail 501 is moved so that the position of the fixing rod 502 corresponds to the position of the filter plate 4. Then, the adjusting block 505 is docked and assembled with the fixing block 504 and the fixing rod 502, and the adjusting block 505 and the fixing block 504 are used to clamp and fix the four corners of the filter plate 4 to prevent the filter plate 4 from shaking in position. At the same time, the bottom end of the filter plate 4 is inserted into the support frame 510, and it can slide along the slide bar 511 on the surface of the support plate 509 by means of the pulley frames 512 on both sides of the support frame 510, which is convenient for supporting the filter plate 4. At this time, multiple filter plates 4 in the inner frame 2 can be conveniently installed, adjusted and limited.

[0036] As Figure 7 shown, the installation mechanism 6 is arranged on both sides of the bottom end of the inner frame 2. The installation mechanism 6 includes an installation frame 61. The installation frame 61 can limit the position of the support plate 509. One side of the installation frame 61 is fixedly connected to the bottom side wall of the inner frame 2. A connecting rod 62 is fixedly penetrated on the surface of the installation frame 61. The connecting rod 62 can slide the position of the connecting block 63. Both ends of the arc surface of the connecting rod 62 are slidably connected with a connecting block 63. The connecting block 63 can be inserted into the surface of the support plate 509. The cross section of the connecting block 63 is in an "L" shape. Limiting holes 67 are opened on both ends of the surface of the support plate 509. The limiting holes 67 can slide through the connecting block 63. The surface of the connecting block 63 slides through the inner wall of the limiting hole 67. The short arm end of the connecting block 63 is clamped with the surface of the support plate 509. A spring 65 is sleeved on the arc surface of the connecting rod 62. The extrusion force generated by the spring 65 can squeeze and limit the position of the connecting block 63. Both ends of the spring 65 are fixedly connected with the connecting block 63 and the installation frame 61 respectively. Two limiting blocks 66 are fixedly connected to the positions of the two ends of the surface of the support plate 509 corresponding to the connecting block 63. The limiting blocks 66 can insert and limit the connecting block 63 to prevent the connecting block 63 from shifting in position. The cross section of the limiting block 66 is in an "L" shape. The inner wall of the limiting block 66 is inserted into the surface of the connecting block 63. A connecting plate 64 is fixedly connected to the side wall of the connecting block 63. The connecting plate 64 can facilitate the extrusion and movement of the position of the connecting block 63. Anti-slip lines are opened on the surface of the connecting plate 64.

[0037] To facilitate the fixation of the position of the support plate 509, the connecting blocks 63 at both ends of the extrusion connecting rod 62 are squeezed at this time, and the two connecting blocks 63 are moved towards the side close to each other. At the same time, the support plate 509 is abutted against the bottom surface of the inner frame 2 until the connecting blocks 63 penetrate through the limiting holes 67 at both ends of the support plate 509. Then, the two connecting blocks 63 are released. At this time, the connecting blocks 63 are subjected to the elastic force generated by the arc surface spring 65 of the connecting rod 62, and the short arm ends of the two connecting blocks 63 are clamped and fixed to the surface of the support plate 509. At this time, the position of the entire support plate 509 will be fixed and cannot be offset.

[0038] As Figure 8 and Figure 9 shown, positioning mechanisms 7 are provided at the positions corresponding to the protective frames 3 on the surface of the four corners of the outer frame 1. The positioning mechanism 7 includes positioning columns 71. The positioning columns 71 can slide and limit the position of the positioning blocks 74. The bottom ends of the positioning columns 71 are fixedly connected to the surface of the outer frame 1. The arc surface of the positioning column 71 is movably connected with a positioning block 74. The positioning block 74 can block and protect the protective frame 3. The cross-section of the positioning block 74 is in the shape of a "one". A tension spring 75 is sleeved on the arc surface of the positioning column 71. The tension spring 75 can squeeze and limit the position of the positioning block 74. The two ends of the tension spring 75 are respectively fixedly connected to the positioning block 74 and the positioning column 71. Through holes 72 are provided on the surface of the protective frame 3 corresponding to the positions of the positioning columns 71. The through holes 72 facilitate the sliding penetration of the positioning blocks 74. The inner wall of the through hole 72 is slidably connected to the surface of the positioning block 74. Card slots 73 are provided on the surface of the protective frame 3 corresponding to the positions of the through holes 72. The card slots 73 can be clamped and limited with the positioning blocks 74. The cross-sectional size of the card slot 73 is adapted to the cross-sectional size of the positioning block 74. The same auxiliary rod 76 is rotatably connected to the two side surfaces of the positioning block 74. The auxiliary rod 76 can stretch and limit the position of the positioning block 74. The cross-section of the auxiliary rod 76 is in the shape of a "U". Extrusion pads 77 are fixedly connected to the peripheral surfaces of the four sides of the protective frame 3 close to the inner frame 2. The extrusion pads 77 can protect the protective frame 3 and prevent the protective frame 3 from being over-extruded. A protective ring 78 is fixedly connected to the position of the protective frame 3 corresponding to the positioning column 71. The protective ring 78 can protect and support the position of the positioning block 74. One sides of the protective ring 78 and the extrusion pads 77 are both abutted against the inner wall surface of the outer frame 1.

[0039] When fixing the position of the protective frame 3, pull the auxiliary rod 76 on the surface of the positioning block 74 to make the auxiliary rod 76 drive the positioning block 74 to rotate along the arc surface of the positioning column 71, so that the positioning block 74 penetrates through the through hole 72 on the surface of the protective frame 3. At the same time, with the squeezing force generated by the tension spring 75, the positioning block 74 is clamped and fixed to the card slot 73 opened on the surface of the protective frame 3. At this time, the protective frame 3 will be fixed to the surface of the outer frame 1. At the same time, the extrusion pads 77 on the peripheral surfaces of the four sides of one side of the protective frame 3 can provide effective support and protection to prevent excessive collision and damage.

[0040] As described above, it is only the preferred embodiment of the present invention, and it is not a limitation to the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A box-type air filter, comprising an outer frame (1), an inner frame (2), a filter plate (4), a mounting mechanism (6) and an adjustment mechanism (5), characterized in that: The outer frame (1) and the inner frame (2) are fixedly connected at a side close to each other, the filter plate (4) is located inside the inner frame (2), a protective frame (3) is installed on the surface of the outer frame (1), the adjustment mechanism (5) is located at a position of the side wall of the inner frame (2) corresponding to the filter plate (4), the adjustment mechanism (5) comprises two fixed rails (501) and an adjustment block (505), the two fixed rails (501) are respectively located on both sides of the inner wall of the inner frame (2), one side of the fixed rail (501) is fixedly connected to the surface of the side wall of the inner frame (2), the inner wall of the fixed rail (501) is slidably connected to a plurality of fixed rods (502), the plurality of fixed rods (502) are grouped in pairs, the cross section of the fixed rod (502) is T-shaped, the arc surface of the fixed rod (502) is threadedly connected to a fixed shaft (503), the fixed The arc surface of the fixed rod (502) is slidably connected to a fixed block (504); a slot (506) is provided on the upper end surface of the adjustment block (505); the inner wall of the slot (506) is plugged into the arc surface of the fixed rod (502); the inner wall of each group of the adjustment block (505) and the fixed block (504) is snap-fitted to the corner surfaces of both sides of the filter plate (4); the end surface of the inner frame (2) away from the outer frame (1) is fixedly connected to a support plate (509) by means of a mounting mechanism (6); the surface of the support plate (509) is fixedly connected to a slide bar (511); the end surface of the filter plate (4) away from the outer frame (1) is abutted against a support frame (510); the lower surface of the support frame (510) is fixedly connected to pulley frames (512) on both sides; the inner wall of the pulley frame (512) is slidably connected to the arc surface of the slide bar (511); The mounting mechanism (6) is arranged on both sides of the bottom end of the inner frame (2). The mounting mechanism (6) comprises a mounting frame (61). One side of the mounting frame (61) is fixedly connected to the side wall of the bottom end of the inner frame (2). A connecting rod (62) is fixedly passed through the surface of the mounting frame (61). Both ends of the circular arc surface of the connecting rod (62) are slidably connected to connecting blocks (63). The cross section of the connecting block (63) is in an "L" shape. Both end surfaces of the support plate (509) are provided with limiting holes (67). The surface of the connecting block (63) and the inner wall of the limiting hole (67) are slidably passed through. The short arm end of the connecting block (63) is clamped with the surface of the support plate (509). The circular arc surface of the connecting rod (62) is sleeved with a spring (65). The two ends of the spring (65) are respectively fixedly connected to the connecting block (63) and the mounting frame (61).

2. A box-type air filter according to claim 1, characterized in that: The upper end cross-section of the fixed block (504) is in a "U" shape, the lower end cross-section of the fixed block (504) is in an "L" shape, the upper end cross-section of the adjustment block (505) is in an "L" shape, and both the fixed block (504) and the adjustment block (505) are hard alloy blocks.

3. A box-type air filter according to claim 1, characterized in that: A scale (508) is provided on the surface of the fixed rail (501), and the scale (508) corresponds to the positions of the fixed block (504) and the adjustment block (505).

4. A box-type air filter according to claim 1, characterized in that: The cross section of the slot (506) is U-shaped, and a connecting strip (507) is fixedly connected to the inner wall surface of the slot (506), wherein the connecting strip (507) is a rubber strip.

5. A box-type air filter according to claim 1, characterized in that: Two limit blocks (66) are fixedly connected to the surfaces of both ends of the support plate (509) at positions corresponding to the connection blocks (63); the cross-section of the limit blocks (66) is L-shaped, and the inner walls of the limit blocks (66) are plugged into the surfaces of the connection blocks (63).

6. A box-type air filter according to claim 5, characterized in that: A connecting plate (64) is fixedly connected to the side wall of the connecting block (63), and a surface of the connecting plate (64) is provided with anti-slip grooves.

7. A box-type air filter according to claim 1, characterized in that: Positioning mechanisms (7) are provided at positions of the four corner surfaces of the outer frame (1) corresponding to the protective frame (3). The positioning mechanisms (7) include positioning columns (71). The bottom ends of the positioning columns (71) are fixedly connected to the surface of the outer frame (1). The arc surface of the positioning columns (71) is movably connected to a positioning block (74). The cross section of the positioning block (74) is in the shape of a letter "I". The arc surface of the positioning columns (71) is sleeved with a tension spring (75). The two ends of the tension spring (75) are respectively fixedly connected to the positioning block (74) and the positioning columns (71). A through hole (72) is provided at a position of the surface of the protective frame (3) corresponding to the positioning column (71). The inner wall of the through hole (72) is slidably connected to the surface of the positioning block (74). A clamping groove (73) is provided at a position of the surface of the protective frame (3) corresponding to the through hole (72). The cross-sectional dimensions of the clamping groove (73) are matched to the cross-sectional dimensions of the positioning block (74).

8. A box-type air filter according to claim 7, characterized in that: The two side surfaces of the positioning block (74) are rotatably connected to the same auxiliary rod (76), and the cross-section of the auxiliary rod (76) is "U"-shaped.

9. A box-type air filter according to claim 8, characterized in that: The surrounding surfaces of the side of the protection frame (3) close to the inner frame (2) are fixedly connected with a compression pad (77), and the position of the protection frame (3) corresponding to the positioning column (71) is fixedly connected with a protection ring (78), and one side of the protection ring (78) and the compression pad (77) are both in contact with the inner wall surface of the outer frame (1).

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