Box-type air filter

Abstract

The invention provides a box-type air filter, and relates to the technical field of box-type filters, the box-type air filter comprises an outer frame, an inner frame, a filter plate, a mounting mechanism and an adjusting mechanism, the sides, close to each other, of the outer frame and the inner frame are fixedly connected, the filter plate is located in the inner frame, and a protective frame is mounted on the surface of the outer frame; the adjusting mechanism is located at the position, corresponding to the filter plate, of the side wall of the inner frame, the adjusting mechanism comprises two fixed rails and an adjusting block, the two fixed rails are located on the two sides of the inner wall of the inner frame respectively, and one side of each fixed rail is fixedly connected with the surface of the side wall of the inner frame. According to the box-type high-efficiency air filter, the problems that in the long-time use process of the box-type high-efficiency air filter, the situation that a filter plate in the filter needs to be detached and cleaned occurs, and the filter plate is inconvenient to mount, regulate and control after the filter plate is detached and replaced due to the fact that most common filter plates are integrated are solved.

Description

Technical Field

[0001] The invention relates to the technical field of box-type filters, and in particular to a box-type air filter. Background Art

[0002] An air filter is a device that captures dust from a gas-solid two-phase flow and purifies the gas through the action of porous filter materials. A box-type high-efficiency air filter is a high-efficiency air purification device, commonly used in industries, laboratories, clean rooms 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 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 more common in daily life.

[0003] Prior art such as the invention with publication number CN112791532A discloses a box-type air filter, which comprises a filter body, a filter inner box is arranged inside the filter body, a plurality of filter plates are installed inside the filter inner box, an air inlet pipe is arranged at one end of the filter inner box, an air outlet pipe is arranged at the other end of the filter inner box, a cooling groove is arranged between the filter body and the filter inner box, a heat sink is arranged on the top of the filter body, a cooling chassis is installed on the top of the heat sink, a fan is installed inside the cooling chassis, a shock absorbing rod is installed at the bottom of the filter body, a shock absorbing spring is sleeved on the shock absorbing rod, and a support frame is installed at the bottom of the shock absorbing rod. The box-type air filter has strong flexibility and strong stability, is easy for people to disassemble and assemble, can quickly filter the air, and can also perform heat exchange on the air containing heat during filtering, thereby reducing the air temperature. It has strong functionality and is easy for people to operate and use.

[0004] It is found in daily life that during the long-term use of the box-type high-efficiency air filter, the filter plate inside the filter will need to be disassembled and cleaned. Since the filter plates are usually integrated, it will be inconvenient to install and adjust the filter plates after disassembling and replacing them. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that during the long-term use of a box-type high-efficiency air filter, the filter plate inside the filter needs to be disassembled and cleaned. Since the filter plates are usually integrated, it is inconvenient to install and adjust the filter plates after disassembling and replacing them.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a box-type air filter, comprising an outer frame, an inner frame, a filter plate, a mounting mechanism and an adjusting mechanism, wherein the outer frame and the inner frame are fixedly connected on one side close to each other, 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 a position of the filter plate on the side wall of the inner frame, the adjusting mechanism comprises 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 side wall surface of the inner frame, the inner wall of the fixed rail is slidably connected with a plurality of fixed rods, the plurality of fixed rods form a group of two, and the The cross-section of the fixing rod is "T"-shaped, and the arc surface of the fixing rod is threadedly connected to a fixing shaft, and the arc surface of the fixing rod is slidably connected to a fixing block, and a slot is provided on the upper end surface of the adjusting block, and the inner wall of the slot is plugged into the arc surface of the fixing rod, and the inner wall of each group of the adjusting block and the fixing block is snapped into the two side corner surfaces of the filter plate, and the end surface of the inner frame away from the outer frame is fixedly connected to a support plate by means of a mounting mechanism, and the surface of the support plate is fixedly connected to a sliding rod, and the end surface of the filter plate away from the outer frame is abutted against a support frame, and pulley frames are fixedly connected to both sides of the lower surface of the support frame, and 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 "U"-shaped, the bottom end cross-section of the fixed block is "L"-shaped, the upper end cross-section of the adjusting block is "L"-shaped, and the fixed block and the adjusting block are both 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 "U"-shaped, and a connecting strip is fixedly connected to the inner wall surface of the slot, and 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, and the mounting mechanism includes a mounting frame, one side of the mounting frame is fixedly connected to the bottom end side wall of the inner frame, a connecting rod is fixedly passed through the surface of the mounting frame, and connecting blocks are slidably connected to both ends of the arc surface of the connecting rod, and the cross-section of the connecting block is "L"-shaped, and limiting holes are provided on the two end surfaces of the support plate, and the surface of the connecting block slides through the inner wall of the limiting hole, and the short arm end of the connecting block is clamped with the surface of the support plate, and the arc surface of the connecting rod is sleeved with a spring, and the two ends of the spring are respectively fixedly connected to the connecting block and the mounting frame.

[0011] Preferably, two limit blocks are fixedly connected to the surfaces of both ends of the support plate at positions corresponding to the connection blocks, the cross-section of the limit blocks is "L"-shaped, and the inner walls of the limit blocks are plugged into the surfaces of the connection blocks.

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

[0013] Preferably, a positioning mechanism is provided at the position of the protective frame corresponding to the corner surface of the outer frame, the positioning mechanism includes a positioning column, the bottom end of the positioning column is fixedly connected to the surface of the outer frame, the arc surface of the positioning column is movably connected with a positioning block, the cross-section of the positioning block is in the shape of an "I", the arc surface of the positioning column is sleeved with a tension spring, the two ends of the tension spring are respectively fixedly connected to the positioning block and the positioning column, a through hole is provided on the surface of the protective frame corresponding to the position of the positioning column, 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, two side surfaces of the positioning block are rotatably connected to the same auxiliary rod, and the cross-section of the auxiliary rod is "U"-shaped.

[0015] Preferably, the protective frame is fixedly connected with compression pads on all four sides of the surface near the inner frame, and the protective frame is fixedly connected with a protective ring at the position corresponding to the positioning column, and one side of the protective ring and the compression pad are both in contact with the inner wall surface of the outer frame.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: 1. In the present invention, by providing an adjustment mechanism, the position of the filter plate inside the inner frame can be regulated, 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, thereby facilitating efficient and convenient air filtering operation and use of the filter plate in the inner frame.

[0017] 2. In the present invention, by setting up an installation mechanism, the installation limit of the support plate position at the bottom end of the inner frame can be set, which is convenient for supporting and protecting the filter plate in the inner frame to prevent the filter plate from loosening and falling off, and the support plate is plugged and fixed by using the connecting blocks sliding at both ends of the connecting rod on the surface of the mounting frame.

[0018] 3. In the present invention, by setting a positioning mechanism, the position of the protection frame can be fixed and limited conveniently and quickly. The positioning block movable on the arc surface of the positioning column is plugged into the slot provided on the surface of the protection frame, so that the protection frame can be quickly fixed. At the same time, when the filter plate is replaced, the protection operation can be further performed with the help of the protection frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional structural schematic diagram of a box-type air filter is provided for the present invention; Figure 2A partial schematic diagram of a three-dimensional structure of a box-type air filter provided by the present invention; Figure 3 A schematic diagram of the disassembled structure of a three-dimensional structure of a box-type air filter proposed by the present invention; Figure 4 A structural schematic diagram of an adjustment mechanism of a box-type air filter is provided for the present invention; Figure 5 The present invention provides a schematic diagram of the disassembled structure of an adjustment mechanism of a box-type air filter; Figure 6 A partial structural schematic diagram of an adjustment mechanism of a box-type air filter proposed by the present invention; Figure 7 A structural schematic diagram of a mounting mechanism for a box-type air filter is provided for the present invention; Figure 8 A structural schematic diagram of a positioning mechanism of a box-type air filter is provided for the present invention; Fig. 9 The present invention provides a partial structural schematic diagram of a positioning mechanism for a box-type air filter.

[0020] 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 strip; 508. Scale; 509. Support plate; 510. Support frame; 511. Sliding rod; 512. Pulley frame; 6. Mounting mechanism; 61. Mounting 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. Slot; 74. Positioning block; 75. Tension spring; 76. Auxiliary rod; 77. Extrusion pad; 78. Protective ring. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0023] Embodiment 1, as Figure 1-3As shown, the present invention provides a box-type air filter, comprising an outer frame 1, an inner frame 2, a filter plate 4, a mounting mechanism 6 and an adjusting mechanism 5, wherein the outer frame 1, the inner frame 2 and a plurality of filter plates 4 are assembled into a box-type air filter, and in the process of using the entire box-type air filter, it will be necessary to disassemble, clean and replace the plurality of filter plates 4 in the inner frame 2. In this process, the protective frame 3 on the surface of the outer frame 1 is first disassembled with the help of the positioning mechanism 7, and the position of the protective frame 3 can be quickly adjusted through the card connection and limit protection between the positioning block 74 sliding on the surface of the positioning column 71 and the card groove 73 on the surface of the protective frame 3, and then the filter plate 4 is replaced and fixed with the help of the adjusting mechanism 5, and the filter plate 4 is placed in the inner frame 2, and then the inner frame 2 is adjusted by adjusting the inner frame 2. The movement of the fixing rod 502 in the fixing rails 501 on both sides of the wall allows the fixing rod 502 to drive the adjustment block 505 and the fixing block 504 to limit the position, so that the adjustment block 505 and the fixing block 504 can clamp and fix the four corners of the filter plate 4. At the same time, the support frame 510 that slides along the sliding rod 511 on the surface of the support plate 509 is used to support and protect the bottom end of the filter plate 4, so that the entire filter plate 4 can be 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, and the connecting block 63 that slides at both ends of the connecting rod 62 is penetrated by the limiting hole 67 on the surface of the support plate 509, so that the short arm end of the connecting block 63 is clamped and fixed to the surface of the support plate 509.

[0024] The specific arrangement and functions of the adjusting mechanism 5, the mounting mechanism 6 and the positioning mechanism 7 are described in detail below.

[0025] like Figure 4 , Figure 5 and Figure 6As shown, the adjustment mechanism 5 includes two fixed rails 501 and an adjustment block 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. The inner wall of the fixed rail 501 is slidably connected with a plurality of fixed rods 502. The fixed rods 502 can dock and limit the position of the adjustment block 505 and the fixed block 504. The plurality of fixed rods 502 are grouped in pairs. The cross section of the fixed rods 502 is "T" shaped. The arc surface of the fixed rod 502 is threadedly connected with a fixed shaft 503. The shaft 503 can squeeze and limit the adjusting block 505 and the fixed block 504. The arc surface of the fixing rod 502 is slidably connected with the fixed block 504. The fixed block 504 and the adjusting block 505 can be clamped and limited on the surface of the filter plate 4. A slot 506 is provided on the upper end surface of the adjusting block 505. The slot 506 can dock and protect the position of the adjusting block 505. The inner wall of the slot 506 is plugged into the arc surface of the fixing rod 502. The inner wall of each group of adjusting blocks 505 and the fixed block 504 is clamped with the corner surfaces on both sides of the filter plate 4. The end surface of the inner frame 2 away from the outer frame 1 is fixedly connected with a support by means of a mounting mechanism 6. The support plate 509 can support and limit the bottom end of the filter plate 4. The surface of the support plate 509 is fixedly connected with a slide bar 511, and the slide bar 511 can drive the support frame 510 to move and adjust the position. The end surface of the filter plate 4 away from the outer frame 1 is abutted against the support frame 510, and the support frame 510 can clamp and fix the filter plate 4. The lower surface of the support frame 510 is fixedly connected with pulley frames 512 on both sides, and the pulley frame 512 can facilitate the movement and 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, and the upper end cross-section of the fixed block 504 is " The bottom cross section of the fixed block 504 is in an "L" shape, the upper cross section of the adjusting block 505 is in an "L" shape, the fixed block 504 and the adjusting block 505 are both carbide blocks, a scale 508 is provided on the surface of the fixed rail 501, the scale 508 can adjust the spacing 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, and a connecting strip 507 is fixedly connected to the inner wall surface of the slot 506, the connecting strip 507 can increase friction, and facilitate better fixing and limiting of the adjusting block 505, and the connecting strip 507 is a rubber strip.

[0026] After the filter plate 4 has been operated and used for a long time, the filter plate 4 is replaced and cleaned and docked with the inside of the inner frame 2 to limit the position. At this time, the fixing rod 502 moved by the inner wall of the moving fixed rail 501 is made to make the position of the fixing rod 502 correspond to the position of the filter plate 4, and then the adjusting block 505 is docked and assembled with the fixing block 504 and the fixing rod 502, so that the adjusting block 505 and the fixing block 504 are clamped and fixed to the four corners of the filter plate 4 to prevent the filter plate 4 from shaking. At the same time, the bottom end of the filter plate 4 is plugged into the support frame 510, and can slide along the slide rod 511 on the surface of the support plate 509 with the help of the pulley frames 512 on both sides of the support frame 510, so as to facilitate the support operation of the filter plate 4. At this time, multiple filter plates 4 in the inner frame 2 can be conveniently installed and adjusted.

[0027] like Figure 7 As shown, the mounting mechanism 6 is arranged on both sides of the bottom end of the inner frame 2, and the mounting mechanism 6 includes a mounting frame 61, and the mounting frame 61 can limit the position of the support plate 509. One side of the mounting frame 61 is fixedly connected to the bottom end side wall of the inner frame 2, and a connecting rod 62 is fixedly penetrated on the surface of the mounting frame 61, and 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 connecting blocks 63, and the connecting block 63 can be plugged into the surface of the support plate 509. The cross-section of the connecting block 63 is "L"-shaped, and both end surfaces of the support plate 509 are provided with limiting holes 67, and 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, and the short arm of the connecting block 63 The end is snap-fitted with the surface of the support plate 509, and the arc surface of the connecting rod 62 is sleeved with a spring 65. The extrusion force generated by the spring 65 can squeeze and limit the position of the connecting block 63. The two ends of the spring 65 are respectively fixedly connected to the connecting block 63 and the mounting frame 61. Two limit blocks 66 are fixedly connected to the surfaces of the two ends of the support plate 509 corresponding to the position of the connecting block 63. The limit block 66 can insert and limit the connecting block 63 to avoid the position displacement of the connecting block 63. The cross-section of the limit block 66 is "L"-shaped, and the inner wall of the limit block 66 is plugged into the surface of the connecting block 63. The side wall of the connecting block 63 is fixedly connected with a connecting plate 64. The connecting plate 64 can facilitate the extrusion and movement of the position of the connecting block 63, and the surface of the connecting plate 64 is provided with anti-slip grooves.

[0028] In order to facilitate fixing the position of the support plate 509, the connecting blocks 63 at both ends of the connecting rod 62 are squeezed, and the two connecting blocks 63 are moved toward the side close to each other, and at the same time, the support plate 509 is abutted against the bottom end surface of the inner frame 2 until the connecting blocks 63 and the limiting holes 67 at both ends of the support plate 509 are penetrated, and 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.

[0029] like Figure 8 and Fig. 9 As shown, positioning mechanisms 7 are provided at positions corresponding to the protective frame 3 on the four corner surfaces of the outer frame 1. The positioning mechanisms 7 include positioning posts 71. The positioning posts 71 can slide and limit the position of positioning blocks 74. The bottom ends of the positioning posts 71 are fixedly connected to the surface of the outer frame 1. The arc surface of the positioning posts 71 is movably connected with positioning blocks 74. The positioning blocks 74 can block and protect the protective frame 3. The cross section of the positioning blocks 74 is in the shape of a letter "I". The arc surface of the positioning posts 71 is sleeved with tension springs 75. The tension springs 75 can squeeze and limit the position of the positioning blocks 74. The two ends of the tension springs 75 are fixedly connected to the positioning blocks 74 and the positioning posts 71, respectively. A through hole 72 is provided on the surface of the protective frame 3 at the position corresponding to the positioning posts 71. The through hole 72 facilitates the sliding penetration of the positioning blocks 74. The inner wall of the through hole 72 and the surface of the positioning blocks 74 The locking ribs 73 are provided on the surface of the protective frame 3 at the position corresponding to the through hole 72, and the locking ribs 73 can be clamped and limited with the positioning block 74. The cross-sectional size of the locking ribs 73 is adapted to the cross-sectional size of the positioning block 74. The two side surfaces of the positioning block 74 are rotatably connected with the same auxiliary rod 76, and the auxiliary rod 76 can stretch and limit the position of the positioning block 74. The cross-sectional shape of the auxiliary rod 76 is "U"-shaped. The surrounding surfaces of the side of the protective frame 3 close to the inner frame 2 are fixedly connected with extrusion pads 77, and the extrusion pads 77 can protect the protective frame 3 to prevent the protective frame 3 from being excessively squeezed. The protective frame 3 is fixedly connected with a protective ring 78 at the position corresponding to the positioning column 71, and the protective ring 78 can provide protective support for the position of the positioning block 74. One side of the protective ring 78 and the extrusion pad 77 are both in contact with the inner wall surface of the outer frame 1.

[0030] When fixing the position of the protective frame 3, pull the auxiliary rod 76 on the surface of the positioning block 74, so that the auxiliary rod 76 drives the positioning block 74 to rotate along the arc surface of the positioning column 71, so that the positioning block 74 is penetrated by the through hole 72 on the surface of the protective frame 3, and at the same time, with the help of the extrusion force generated by the tension spring 75, the positioning block 74 is clamped and fixed with the 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, and at the same time, the extrusion pads 77 on the surrounding surfaces of one side of the protective frame 3 can provide effective support and protection to avoid excessive bumps and damage.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls 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); pulley frames (512) are fixedly connected to both sides of the lower surface 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).

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: 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).

6. A box-type air filter according to claim 5, 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).

7. 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.

8. The 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).

9. A box-type air filter according to claim 8, 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.

10. 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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