Self-cleaning filter plate, filter system and air sampling equipment

Abstract

The invention discloses a self-cleaning filter plate, a filter system and air sampling equipment, and relates to the related technical field of air sampling, the self-cleaning filter plate comprises a filter mechanism, the filter mechanism comprises a connecting box, a filter plate and two cleaning brushes, the filter plate is slidably inserted in the connecting box, the two cleaning brushes are symmetrically arranged, and the cleaning brushes are slidably mounted in the connecting box; a telescopic rod is installed in the connecting box, a first elastic piece is installed in the connecting box, the two cleaning brushes are made to get close to each other, the telescopic rod is used for driving the filter plate to pass through the two cleaning brushes, brush heads of the two cleaning brushes make contact with the two end faces of the filter plate correspondingly, and impurities blocked on the filter plate are swept away; the telescopic rod drives the filter plate to slide up and down in the connecting box, the two end faces of the filter plate sliding downwards make contact with brush heads of the cleaning brushes, impurities blocking filter holes in the surface of the filter plate are swept away through the cleaning brushes, the filter plate is prevented from being blocked, and the problem that the filter plate in an existing air sampling device depends on physical interception and is not prone to blockage is solved. And particulate matters are continuously accumulated to block micropores.

Description

Technical Field

[0001] The present invention relates to the technical field related to air sampling, and specifically provides a self-cleaning filter plate, a filtration system and an air sampling device. Background Art

[0002] An air sampling device is a professional instrument used to collect, detect and analyze particulate matter (such as PM2.5, PM10), microorganisms (such as bacteria, viruses), gaseous pollutants (such as sulfur dioxide) or specific components (such as pollen, radioactive substances) in the air. Its core function is to capture air samples through physical or chemical methods, providing data support for environmental monitoring, industrial safety, public health or scientific research experiments.

[0003] Most air sampling devices are divided into particulate matter sampling devices, microbial sampling devices, gaseous pollutant sampling devices, and special sampling devices. Among them, particulate matter sampling devices mainly use a suction pump to make air pass through a filter membrane (such as fiberglass, polytetrafluoroethylene membrane) to intercept particulate matter in the air, and then determine the concentration through weighing or component analysis (such as X-ray fluorescence spectroscopy). Therefore, the filter plate in the air sampling device is one of the core components, and its function is to efficiently capture target pollutants through physical interception, adsorption or chemical reactions, etc., providing a reliable sample for subsequent analysis.

[0004] However, the filter plates in existing particulate matter sampling devices rely on physical interception. The continuous accumulation of particulate matter will clog the micropores, resulting in an increase in air flow resistance (the pressure drop may increase by 200% after 1 hour of use). Such a consequence is that the sampling flow rate becomes unstable, and the capture rate of low-concentration particulate matter such as PM2.5 decreases (actual measurement shows that the PM2.5 interception efficiency may drop from 99% to 85% after clogging). Therefore, the filter plate needs to be replaced frequently (even every 4 - 8 hours in a heavily polluted environment). This not only greatly increases the consumable cost and manual maintenance time, but also causes the monitoring data to be discontinuous due to downtime for membrane replacement, seriously affecting the accuracy of long-term air quality assessment. To solve the above-mentioned problems, a self-cleaning filter plate, a filtration system and an air sampling device are provided. Summary of the Invention

[0005] The purpose of the present invention is to provide a self-cleaning filter plate, a filtration system and an air sampling device to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A self-cleaning filter plate, comprising a filtering mechanism; The filtering mechanism includes a connection box, a filter plate and two cleaning brushes. The filter plate is slidably inserted into the connection box, the two cleaning brushes are symmetrically arranged, and the cleaning brushes are slidably installed inside the connection box; Inside the connection box, there is a telescopic rod installed for controlling the up-and-down sliding of the filter plate. Inside the connection box, there is a first elastic member installed for applying elastic force to the cleaning brush, causing the two cleaning brushes to approach each other; The telescopic rod is used to drive the filter plate through between the two cleaning brushes. The brush heads of the two cleaning brushes respectively contact the two end faces of the filter plate, sweeping away the blocked impurities on the filter plate.

[0007] In a further embodiment, the first elastic member is set as a metal spring piece.

[0008] In a further embodiment, the telescopic rod is set as an electric push rod.

[0009] In a further embodiment, a rubber strip is provided at the edge of the filter plate for sealing the inside of the filter plate and the connection box.

[0010] A filtering system, including the above self-cleaning aluminum plate; Including a linkage mechanism; There are two linkage mechanisms, and the two linkage mechanisms are symmetrically arranged. The linkage mechanism includes a first toothed plate, a second toothed plate and three gears. The first toothed plate is fixedly installed at the lower end of the filter plate, the second toothed plate is fixedly connected to the lower end of the cleaning brush, and the three gears are rotatably installed inside the connection box in a straight line and meshed with each other. The upper gear meshes with the second toothed plate, and the lower gear meshes with the first toothed plate In a further embodiment, a sliding frame is slidably installed up and down inside the connection box. The sliding frame has a U-shaped structure. The two upper ends of the sliding frame are fixedly connected with clamping blocks. A clamping hole matching the clamping block is opened at the lower end of the cleaning brush. Inside the connection box, a second elastic member for applying upward elastic force to the sliding frame is installed.

[0011] In a further embodiment, the first toothed plate includes a base block, a sliding block and a third elastic member. The base block is fixedly connected to the lower end of the filter plate. Oblique sliding grooves are opened on both sides of the base block. The oblique sliding grooves are inclined. The sliding block is slidably installed in the oblique sliding groove, and a toothed groove meshing with the gear is opened at one end of the sliding block. The third elastic member is installed inside the base block, and the third elastic member applies an obliquely downward elastic force to the sliding block.

[0012] In a further embodiment, both the second elastic member and the third elastic member are set as springs.

[0013] In a further embodiment, a collection groove for receiving impurities is clamped at the lower end of the connection box.

[0014] An air sampling device, including the above filtering system: The main body of the device; An air inlet pipe is connected to one side of the main body, and the air inlet pipe is connected to the connection box through a pipeline.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The present invention relates to a self-cleaning filter plate, a filtration system and an air sampling device. The telescopic rod drives the filter plate to slide up and down in the connection box. The two end faces of the downward-sliding filter plate contact the brush heads of the cleaning brushes, and the impurities blocking the filter holes on the surface of the filter plate are swept away by the cleaning brushes, preventing the filter plate from being blocked, and solving the problem that the filter plate in the existing air sampling device relies on physical interception and the particulate matter accumulates continuously, which will block the micropores. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the air sampling device according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the main body structure according to an embodiment of the present invention; Figure 3 It is a half-sectional view of the connection box according to an embodiment of the present invention; Figure 4 It is according to an embodiment of the present invention Figure 3 The enlarged view at A in; Figure 5 It is a schematic diagram of the filter plate structure according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the cleaning brush structure according to an embodiment of the present invention; Figure 7 It is a partial cross-sectional view of the connection box according to an embodiment of the present invention; Figure 8 It is a schematic diagram of the sliding frame structure according to an embodiment of the present invention; Figure 9 It is a cross-sectional view of the first toothed plate according to an embodiment of the present invention; Figure 10 It is a schematic diagram of the exploded structure of the collection tank according to an embodiment of the present invention.

[0017] In the figure: 1, main body; 2, intake pipe; 3, filtration mechanism; 31, connection box; 311, telescopic rod; 312, collection tank; 32, filter plate; 33, cleaning brush; 331, first elastic member; 332, second toothed plate; 34, sliding frame; 341, clamping block; 342, second elastic member; 35, first toothed plate; 351, base block; 352, sliding block; 353, third elastic member; 36, gear. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 - 10, this embodiment provides a self-cleaning filter plate, a filtration system and an air sampling device, including the host 1 of the air sampling device. The host 1 is an air sampler with a reference model of HI-Q. Inside the host 1, there are a two-stage fan, a brush motor, and a resetable elapsed time timer, which can perform instantaneous flow readings and can be used continuously or intermittently. An air inlet is provided on the side of the host 1, and an exhaust hole is provided on the other end face. By starting the fan, air can be driven into the host 1.

[0020] When the host 1 is in use, it is necessary to filter and collect particulate matter in the air. Therefore, an intake pipe 2 is installed at the air inlet on the outer wall of the host 1, and a filtering mechanism 3 is provided at the other end of the intake pipe 2. As Figure 3 shown, the filtering mechanism 3 includes a connection box 31, a filter plate 32 and a cleaning brush 33. Among them, two cleaning brushes 33 are provided. The intake pipe 2 is connected to the connection box 31 through a pipeline. The connection box 31 is composed of an upper box body, a pipe body and a lower box body. A sliding cavity is provided inside the connection box 31, and the filter plate 32 is vertically and slidably installed in the sliding cavity, so that the filter plate 32 can reciprocate between the upper box body and the lower box body. As Figure 3 shown, an expansion rod 311 is installed inside the upper box body. The expansion rod 311 is an electric expansion rod (electric push rod). The output rod of the expansion rod 311 faces downward, and one end of the output rod is fixedly connected to the upper end of the filter plate 32. The filter plate 32 can be controlled to slide up and down in the connection box 31 through the expansion rod 311.

[0021] As Figure 5 shown, the filter plate 32 is composed of a frame and a mesh surface in the middle of the frame. The mesh surface of the filter plate 32 is made of PTFE microporous membrane material with a pore diameter of 0.3 μm, which can effectively intercept PM2.5 particles. The lower end of the frame is wider, which is convenient for the filter plate 32 to drive the impurities filtered out on the filter plate 32 to descend into the lower box body together when the filter plate 32 moves downward. A rubber strip is provided at the edge of the frame of the filter plate 32. When the filter plate 32 moves into the pipe body, the filter plate 32 can be sealed through the rubber strip to ensure that when air flows through the pipe body, it can smoothly pass through the mesh surface of the filter plate 32 to physically block particulate matter and other impurities.

[0022] A cleaning groove is provided inside the lower box body of the connection box 31. Horizontal sliding grooves are provided on both side walls inside the cleaning groove. The cleaning brushes 33 are slidably installed in the horizontal sliding grooves, and the two cleaning brushes 33 are symmetrically arranged. The bristles of the cleaning brushes 33 are made of nylon material with a hardness of Shore 75D, which can ensure the cleaning effect without damaging the mesh surface of the filter plate 32. A first elastic member 331 is also installed in the horizontal sliding groove. As Figure 6 shown, the first elastic member 331 is a metal spring piece. The first elastic member 331 applies an elastic force to the cleaning brushes 33, so that the two cleaning brushes 33 approach each other, and at the same time, the bristles of the cleaning brushes 33 extend into the cleaning groove.

[0023] After the telescopic rod 311 drives the filter plate 32 to move downward, the filter plate 32 moves into the cleaning groove of the lower box body. After the larger and wider part at the lower end of the filter plate 32 contacts the bristles of the cleaning brush 33, it will drive the bristles of the cleaning brush 33 to produce a bending deformation. After the cleaning brush 33 separates from the larger part at the lower end of the filter plate 32, the bristles of the cleaning brush 33 will recover due to their own elasticity. At this time, the bristles of the two cleaning brushes 33 can respectively contact the two end faces of the filter plate 32. After the filter plate 32 continues to move downward, the cleaning brush 33 can clean the two end faces of the filter plate 32. Similarly, after the filter plate 32 moves upward, the cleaning brush 33 can also clean the filter plate 32 again. The contact pressure between the cleaning brush 33 and the filter plate 32 should be maintained within the range of 0.5 - 1.2 N / cm². The particulate matter and other impurities cleaned out will fall downward due to their own gravity and then be discharged from the lower end of the connection box 31.

[0024] As Figure 1 and Figure 3 shown, a collection groove 312 is clamped at the lower end of the connection box 31. The impurities discharged from the bottom of the connection box 31 under the action of gravity can be collected in the collection groove 312. By weighing or analyzing the components (such as X-ray fluorescence spectroscopy) of the residues on the filter plate 32 and the impurities collected in the collection groove 312, the concentration of impurities in the air can be measured.

[0025] However, it is found in actual operation that when the filter plate 32 moves downward and is cleaned by the cleaning brush 33, a large amount of impurities will fall above the cleaning brush 33 and cannot be collected. To ensure the cleanliness of the cleaning brush 33 and prevent impurities from accumulating above the cleaning brush 33, when the filter plate 32 moves downward, the cleaning brush 33 can be slid and retracted into the horizontal sliding groove of the lower box body of the connection box 31. After the filter plate 32 moves upward, the bristles of the cleaning brush 33 are driven by the elasticity of the first elastic member 331 to pop out from the horizontal sliding groove into the cleaning groove. To achieve the above purpose, a linkage mechanism is installed in the connection box 31. Among them, two linkage mechanisms are provided, and the two linkage mechanisms are symmetrically arranged. Each linkage mechanism controls the movement of a cleaning brush 33. The linkage mechanism includes a first toothed plate 35, a second toothed plate 332, and three gears 36. The first toothed plate 35 is fixedly installed at the lower end of the filter plate 32. The second toothed plate 332 is fixedly connected to the lower end of the cleaning brush 33. The three gears 36 are rotatably installed inside the connection box 31 in a straight line and meshed with each other, and the size ratio of the three gears 36 refers to Figure 7 shown. The upper gear 36 meshes with the second toothed plate 332, and the lower gear 36 meshes with the first toothed plate 35. At this time, the up and down movement of the filter plate 32 will drive the gears 36 to rotate. To achieve the purpose of cleaning when the filter plate 32 rises and the cleaning brush 33 does not contact the filter plate 32 when it descends, a sliding frame 34 is also slidably installed up and down inside the connection box 31, and a toothed plate that meshes with the first toothed plate 35 in one direction is used.

[0026] Specifically, as Figure 8 shown, the sliding frame 34 is in a U-shaped structure. At both upper ends of the sliding frame 34, there are fixed connection blocks 341. Inside the connection box 31, a second elastic member 342 is installed. The second elastic member 342 is set as a spring, and an upward elastic force is applied to the sliding frame 34 through the second elastic member 342. As Figure 6 shown, at the lower end of the cleaning brush 33, there is a clamping hole matching the clamping block 341. After the cleaning brush 33 contracts into the horizontal sliding groove, the clamping groove is aligned with the clamping block 341 vertically. After the elastic force of the second elastic member 342 drives the sliding frame 34 to move upward, the clamping block 341 can be inserted into the clamping groove of the cleaning brush 33, thereby fixing the cleaning brush 33 and keeping the cleaning brush 33 in the horizontal sliding groove.

[0027] As Figure 9 shown, the first toothed plate 35 includes a base block 351, a sliding block 352, and a third elastic member 353. The base block 351 is fixedly connected to the lower end of the filter plate 32. On both sides of the base block 351, there are inclined sliding grooves which are inclined. The sliding block 352 is slidably installed in the inclined sliding groove, and at one end of the sliding block 352, there is a tooth groove meshing with the gear 36. The third elastic member 353 is installed in the base block 351, and the third elastic member 353 applies an inclined downward elastic force to the sliding block 352.

[0028] Before use, the telescopic rod 311 drives the filter plate 32 to move from the lower box body of the connection box 31 into the pipe body. During the movement of the filter plate 32, the first toothed plate 35 is driven to move, so that the tooth surface of the sliding block 352 meshes with the lowermost gear 36, driving the gear 36 to rotate. Then, through the second toothed plate 332, the cleaning brush 33 is driven to move and contract into the horizontal sliding groove. When the sliding frame 34 is subjected to the elastic force of the second elastic member 342, the clamping block 341 is inserted into the lower clamping groove of the cleaning brush 33, thereby fixing the cleaning brush 33 in the horizontal sliding groove. During the process of the telescopic rod 311 driving the filter plate 32 to move downward, after the tooth surface of the sliding block 352 contacts the gear 36, since the clamping block 341 fixes the cleaning brush 33, the gear 36 is fixed through the second toothed plate 332. As Figure 9 shown, since the tooth surfaces of both the gear 36 and the sliding block 352 are trapezoidal teeth, and the two sides of the teeth are inclined planes, the immovable gear 36 will apply an inclined upward force to the downward moving sliding block 352, driving the sliding block 352 to slide and contract into the inclined sliding groove. At this time, when the filter plate 32 moves downward, it cannot drive the cleaning brush 33 to move.

[0029] After the filter plate 32 moves to the lowermost position, it contacts the sliding carriage 34, applying a downward force to the sliding carriage 34, driving the sliding carriage 34 to move downward, and then driving the latch 341 to disengage from the latching hole of the cleaning brush 33. At this time, the cleaning brush 33 can extend out from the notch of the horizontal sliding groove under the elastic force of the first elastic member 331. In summary, when the filter plate 32 reciprocates up and down, the movement of the cleaning brush 33 can be linked through the linkage mechanism and the sliding carriage 34. During the upward movement of the filter plate 32, the cleaning brush 33 cleans the surface of the filter plate 32. After the cleaning of the filter plate 32 is completed and the tooth surface of the first toothed plate 35 contacts the lowermost gear 36, the cleaning brush 33 is driven to contract into the horizontal sliding groove. After the filter plate 32 descends to the lowest position, the cleaning brush 33 is then ejected through the sliding carriage 34 and the first elastic member 331.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-cleaning filter plate, characterized in that: include: Filter mechanism (3); The filtering mechanism (3) comprises a connection box (31), a filter plate (32) and two cleaning brushes (33); the filter plate (32) is slidably inserted in the connection box (31); the two cleaning brushes (33) are symmetrically arranged, and the cleaning brushes (33) are slidably installed inside the connection box (31); A telescopic rod (311) for controlling the filter plate (32) to slide up and down is installed in the connection box (31), and a first elastic member (331) for applying elastic force to the cleaning brush (33) is installed in the connection box (31) so that the two cleaning brushes (33) are close to each other; The telescopic rod (311) is used to drive the filter plate (32) to pass between the two cleaning brushes (33), and the brush heads of the two cleaning brushes (33) respectively contact the two end surfaces of the filter plate (32) to remove impurities blocking the filter plate (32).

2. A self-cleaning filter plate according to claim 1, characterized in that: The first elastic member (331) is configured as a metal spring.

3. A self-cleaning filter plate according to claim 1, characterized in that: The telescopic rod (311) is configured as an electric push rod.

4. The self-cleaning filter plate according to claim 1, wherein the edge of the filter plate (32) is provided with a rubber strip for sealing the filter plate (32) and the inside of the connection box (31).

5. A filtration system comprising a self-cleaning filter plate as claimed in any one of claims 1 to 4, characterized in that: It also includes linkage mechanisms; The linkage mechanisms are provided in two numbers, and the two linkage mechanisms are symmetrically arranged. The linkage mechanisms comprise a first tooth plate (35), a second tooth plate (332) and three gears (36). The first tooth plate (35) is fixedly mounted on the lower end of the filter plate (32), the second tooth plate (332) is fixedly connected to the lower end of the cleaning brush (33), and the three gears (36) are rotatably mounted inside the connection box (31) in a straight line shape and mesh with each other. The gear (36) at the upper end meshes with the second tooth plate (332), and the gear (36) at the lower end meshes with the first tooth plate (35).

6. The filtration system according to claim 5, characterized in that: A sliding frame (34) is installed in the connection box (31) so as to slide up and down. The sliding frame (34) is in a U-shaped structure. Two upper ends of the sliding frame (34) are fixedly connected with a clamping block (341). A clamping hole matching the clamping block (341) is provided at the lower end of the cleaning brush (33). A second elastic member (342) for applying an upward elastic force to the sliding frame (34) is installed in the connection box (31).

7. The filtration system according to claim 5, characterized in that: The first tooth plate (35) comprises a base block (351), a sliding block (352) and a third elastic member (353); the base block (351) is fixedly connected to the lower end of the filter plate (32); both sides of the base block (351) are provided with inclined sliding grooves, the inclined sliding grooves are arranged at an angle, the sliding block (352) is slidably mounted in the inclined sliding grooves, and one end of the sliding block (352) is provided with a tooth groove that meshes with the gear (36); the third elastic member (353) is mounted in the base block (351), and the third elastic member (353) applies an elastic force that is inclined downward to the sliding block (352).

8. The filtration system according to claim 7, characterized in that: The second elastic member (342) and the third elastic member (353) are both configured as springs.

9. The filtration system according to claim 5, characterized in that: The lower end of the connection box (31) is engaged with a collecting groove (312) for collecting impurities.

10. Air sampling equipment, characterized in that A filtration system comprising any one of claims 5 to 9, and The device's host (1); An air intake pipe (2) is connected to one side of the main unit (1), and the air intake pipe (2) is connected to a connection box (31) via a pipeline.

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