Filter bag with multi-stage filtering effect

Abstract

The utility model discloses a filter bag with a multi-stage filtering effect, and relates to the technical field of filter bags. The multi-stage filter comprises a shell, a multi-stage filter assembly and an anti-blocking cleaning assembly, the top of the shell is communicated with an exhaust hood, the left side of the top of the exhaust hood is communicated with an exhaust pipe, and the multi-stage filter assembly comprises two coarse particle filter screens. According to the utility model, the multi-stage filter assembly is adopted, a double-layer graded interception structure of the coarse particle filter screen and the fine particle filter screen is adopted, the coarse particle filter screen is positioned at the front end of airflow, large-particle pollutants are intercepted preferentially, the filtering load of the subsequent fine particle filter screen is reduced, coarse particles are prevented from directly impacting surface pores of the fine particle filter screen, and the risk of blockage of a filter layer is reduced; through the gradient filtration design, coarse and fine particles are respectively intercepted at different levels, the overall pressure difference fluctuation of the filter bag is obviously reduced, the continuous working time of the filter bag is prolonged, and meanwhile, the efficient interception capability of the fine particle filter screen on micron-sized pollutants is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of filter bag technology, and in particular relates to a filter bag with multi-stage filtration effect. Background Technology

[0002] Filter bags are bag-shaped filter elements used for gas-solid or liquid-solid separation. They are made of fiber fabric or flexible felt as the base material and formed through processes such as weaving and needle punching. They intercept particulate matter by utilizing the gaps between fibers and have the characteristics of high-precision filtration, temperature and corrosion resistance, and easy replacement. They are widely used in industrial dust removal, liquid purification and other fields.

[0003] Traditional industrial filter bags mostly use a single material, such as polyester fiber or polyphenylene sulfide. Although they can meet basic filtration requirements, they have significant drawbacks. When treating flue gas containing a mixture of coarse and fine particles, the coarse particles easily clog the pores on the surface of the filter bag, causing a sharp increase in pressure differential. Meanwhile, the fine particles penetrate and cause secondary pollution. Although existing technologies include vibration cleaning or pulse jet cleaning devices, the single filter layer structure causes coarse and fine particles to be mixed and peeled off during cleaning, making it impossible to achieve graded interception and targeted anti-clogging. This results in decreased filtration efficiency and a shortened average lifespan of the filter bag, which is not conducive to its use.

[0004] To address these issues, we provide a filter bag with multi-stage filtration capabilities. Utility Model Content

[0005] The purpose of this utility model is to provide a filter bag with multi-stage filtration effect. By combining multi-stage filtration components and anti-clogging cleaning components, it solves the problem that the filter bags in the prior art are usually single-layer structures, which are prone to reduced filtration efficiency and shortened average life of filter bags when filtering mixed flue gas of coarse and fine particles.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0007] This utility model relates to a filter bag with multi-stage filtration, comprising a shell, a multi-stage filtration assembly, and an anti-clogging and cleaning assembly. The top of the shell is connected to an exhaust hood, and the left side of the top of the exhaust hood is connected to an exhaust pipe. The multi-stage filtration assembly includes two coarse particle filters, each fixedly connected to the shell on its opposite side. A fine particle filter is disposed within the inner cavity of the shell, and a sealing plate is fitted onto the bottom of the surface of the fine particle filter. A telescopic mechanism is fixedly connected to the right side of the shell, and the left side of the bottom of the telescopic mechanism is fixedly connected to the sealing plate. The anti-clogging and cleaning assembly includes two scraper brackets, the bottom of which is fixedly connected to the sealing plate. A reset mechanism is fixedly connected to the left side of the shell, and the bottom of the reset mechanism is fixedly connected to the sealing plate. An air supply pipe is connected to the right side of the top of the exhaust hood.

[0008] The present invention is further configured such that the telescopic mechanism includes an air chamber, the left side of which is fixedly connected to the housing, a piston is provided in the inner cavity of the air chamber, a connecting rod is fixedly connected to the bottom of the piston, the bottom of the connecting rod passes through the air chamber and is fixedly connected to the sealing plate, a conduit is connected to the top of the air chamber, and the top of the conduit is connected to the air supply pipe. The piston can move downward after air is input into the top of the air chamber. When the piston moves, it is used to adjust the height of the connecting rod and the sealing plate. The conduit can transport part of the air discharged from the air supply pipe to the inside of the air chamber.

[0009] The present invention is further configured such that a sliding sleeve is slidably connected to the surface of the connecting rod, the top of the sliding sleeve is fixedly connected to the inner wall of the air chamber, and a solenoid valve is installed on the surface of the conduit. The sliding sleeve can increase the stability of the connecting rod during its up-and-down movement, and the solenoid valve can control the opening and closing of the conduit.

[0010] The present invention is further configured such that the reset mechanism includes a reset shell, the right side of the reset shell is fixedly connected to the housing, the inner cavity of the reset shell is provided with a limit plate, the top of the limit plate is fixedly connected with a tension spring, and the bottom of the limit plate is fixedly connected with a reset rod. The bottom of the reset rod penetrates the reset shell and is fixedly connected to a sealing plate. The limit plate can prevent the reset rod from dislodging from the inner cavity of the reset shell, and the tension spring is used to stretch the limit plate and the reset rod, so that the sealing plate resets after movement and re-seals the bottom of the housing.

[0011] The present invention is further configured such that the front and rear sides of the limiting plate are provided with sliding grooves, and the inner cavity of the sliding grooves is slidably connected with sliding strips. The opposite sides of the two sliding strips are fixedly connected to the inner wall of the reset shell. The sliding grooves and sliding strips can increase the stability of the limiting plate during movement and prevent it from deviating during movement.

[0012] The present invention is further configured such that the top of the tension spring is fixedly connected to the inner wall of the reset shell, and the bottom of the reset shell is provided with an adjustment opening for use with the reset rod. The adjustment opening allows the reset rod to move up and down easily, so that the sealing plate can be reset after movement.

[0013] The present invention is further configured such that the scraper frame includes a plurality of staggered cleaning scrapers, the cleaning scrapers are fixedly connected to each other by a column, the bottom of the column is fixedly connected to a sealing plate, the cleaning scrapers can clean the surface of the fine particle filter screen, and the column is used to position and fix the plurality of cleaning scrapers.

[0014] The present invention has the following beneficial effects.

[0015] 1. This utility model employs a multi-stage filtration assembly with a dual-layer graded interception structure consisting of a coarse particle filter and a fine particle filter. The coarse particle filter is located at the front end of the airflow, prioritizing the interception of large particulate pollutants and reducing the filtration load of the subsequent fine particle filter. This avoids coarse particles directly impacting the surface pores of the fine particle filter, reducing the risk of filter layer blockage. Through gradient filtration design, coarse and fine particles are respectively intercepted at different levels, significantly reducing the overall pressure difference fluctuation of the filter bag and extending the continuous working time of the filter bag. At the same time, it ensures the high-efficiency interception capability of the fine particle filter for micron-sized pollutants, solving the problem of decreased filtration efficiency caused by the impact of mixed particles in traditional single-layer filter bags.

[0016] 2. This utility model, through an anti-clogging cleaning component, combines the directional mechanical scraping of the scraper frame with the airflow backflushing technology of the air supply pipe to achieve precise dust removal for different filter layer characteristics. Loose coarse particles accumulated on the surface of the coarse particle filter screen are blown off by the reverse airflow introduced by the air supply pipe, while dense fine particles adhering to the surface of the fine particle filter screen are scraped off by the scraper frame during the lifting and lowering of the sealing plate. The two dust removal methods work together to avoid the problems of coarse and fine particle mixing and peeling and secondary pollution caused by the traditional single dust removal mode. This ensures that the filter screen pore recovery rate is improved after dust removal, maintains the continuous and efficient filtration performance of the multi-stage filter screen, and effectively solves the problem of shortened filter bag life caused by incomplete dust removal in the existing technology. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 A three-dimensional view of a filter bag with multi-stage filtration effect;

[0019] Figure 2 This is a cross-sectional view of the inner shell of a filter bag with multi-stage filtration effect;

[0020] Figure 3 A schematic diagram of a fine particle filter screen and scraper frame in a filter bag with multi-stage filtration effect;

[0021] Figure 4 This is a cross-sectional view of the reset shell in a filter bag with multi-stage filtration effect;

[0022] Figure 5 This is a cross-sectional view of the air chamber in a filter bag with multi-stage filtration.

[0023] In the attached diagram: 1. Housing; 2. Exhaust hood; 3. Exhaust pipe; 4. Multi-stage filter assembly; 41. Coarse particle filter; 42. Fine particle filter; 43. Sealing plate; 44. Telescopic mechanism; 5. Anti-clogging cleaning assembly; 51. Scraper frame; 52. Reset mechanism; 53. Air supply pipe; 441. Air chamber; 442. Piston; 443. Connecting rod; 444. Conduit; 445. Solenoid valve; 521. Reset shell; 522. Limiting plate; 523. Tension spring; 524. Reset rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1

[0026] Please see Figure 1-5 This utility model is a filter bag with multi-stage filtration effect, including a shell 1, a multi-stage filtration assembly 4, and an anti-clogging cleaning assembly 5. The top of the shell 1 is connected to an exhaust hood 2, and the left side of the top of the exhaust hood 2 is connected to an exhaust pipe 3. The multi-stage filtration assembly 4 includes two coarse particle filters 41, and the opposite sides of the two coarse particle filters 41 are fixedly connected to the shell 1. The inner cavity of the shell 1 is provided with a fine particle filter 42, and a sealing plate 43 is fitted on the bottom of the surface of the fine particle filter 42. A telescopic mechanism 44 is fixedly connected to the right side of the shell 1, and the left side of the bottom of the telescopic mechanism 44 is fixedly connected to the sealing plate 43. The anti-clogging cleaning assembly 5 includes two scraper brackets 51, and the bottom of the two scraper brackets 51 is fixedly connected to the sealing plate 43. A reset mechanism 52 is fixedly connected to the left side of the shell 1, and the bottom of the reset mechanism 52 is fixedly connected to the sealing plate 43. An air supply pipe 53 is connected to the right side of the top of the exhaust hood 2.

[0027] Specifically: the exhaust hood 2 and exhaust pipe 3 can discharge the filtered flue gas; the coarse particle filter 41 can filter the coarse dust particles in the flue gas and block them to the outside of the housing 1; the fine particle filter 42 can filter the fine dust particles and prevent them from entering the interior of the exhaust hood 2; the sealing plate 43 is used to seal the bottom of the housing 1; the telescopic mechanism 44 can adjust the working height of the sealing plate 43; the scraper frame 51 can clean the surface of the fine particle filter 42 when the sealing plate 43 is opened, sweeping off the dust attached to its surface; as the sealing plate 43 is opened, the gas is discharged from the housing 1; the gas supply pipe 53 can transport the gas to the gas chamber 441 and the interior of the housing 1; and the dust attached to the surface of the coarse particle filter 41 and the fine particle filter 42 is blown off by the gas backflushing method.

[0028] Example 2

[0029] Please see Figure 1-5Based on Embodiment 1, the telescopic mechanism 44 includes an air chamber 441. The left side of the air chamber 441 is fixedly connected to the housing 1. A piston 442 is provided in the inner cavity of the air chamber 441. A connecting rod 443 is fixedly connected to the bottom of the piston 442. The bottom of the connecting rod 443 passes through the air chamber 441 and is fixedly connected to the sealing plate 43. A conduit 444 is connected to the top of the air chamber 441. The top of the conduit 444 is connected to the air supply pipe 53. A sliding sleeve is slidably connected to the surface of the connecting rod 443. The top of the sliding sleeve is fixedly connected to the inner wall of the air chamber 441. A solenoid valve 445 is installed on the surface of the conduit 444. The reset mechanism 52 includes a reset shell 521. The right side of the reset shell 521 is fixedly connected to the housing 1. The inner cavity of the reset shell 521 is provided with... A limiting plate 522 is provided, with a tension spring 523 fixedly connected to the top of the limiting plate 522 and a reset rod 524 fixedly connected to the bottom of the limiting plate 522. The bottom of the reset rod 524 passes through the reset shell 521 and is fixedly connected to the sealing plate 43. Slide grooves are provided on the front and rear sides of the limiting plate 522. Slide strips are slidably connected to the inner cavity of the slide grooves. The opposite sides of the two slide strips are fixedly connected to the inner wall of the reset shell 521. The top of the tension spring 523 is fixedly connected to the inner wall of the reset shell 521. An adjustment opening for use with the reset rod 524 is provided at the bottom of the reset shell 521. The scraper frame 51 includes multiple staggered cleaning scrapers. The cleaning scrapers are fixedly connected to each other by a column. The bottom of the column is fixedly connected to the sealing plate 43.

[0030] Specifically: Piston 442 can move downwards after air is introduced into the top of air chamber 441. When moving, piston 442 is used to adjust the working height of connecting rod 443 and sealing plate 43. Conduit 444 can deliver part of the air discharged from air pipe 53 into the air chamber 441. Sliding sleeve can increase the stability of connecting rod 443 during up and down movement. Solenoid valve 445 can control the opening and closing of conduit 444. Limiting plate 522 can prevent reset rod 524 from dislodging from the inner cavity of reset shell 521. Tension spring 523 is used to stretch limiting plate 522 and reset rod 524, so that sealing plate 43 resets after movement and re-seals the bottom of shell 1. Sliding groove and sliding strip can increase the stability of limiting plate 522 during movement and prevent it from deviating during movement. Adjusting opening can facilitate the up and down movement of reset rod 524 and facilitate the reset of sealing plate 43 after movement. Cleaning scraper can clean the surface of fine particle filter screen 42. Column is used to position and fix multiple cleaning scrapers.

[0031] The working principle of this invention is as follows: the coarse particle filter 41 filters the flue gas, where large particulate pollutants are intercepted on the outside. The airflow that has undergone preliminary filtration continues to flow to the fine particle filter 42, where micron-sized particles are trapped. The clean airflow is finally discharged from the system through the exhaust hood 2 and the exhaust pipe 3. Through the gradient filtration design, coarse and fine particles are trapped at different levels, significantly reducing the overall pressure difference fluctuation of the filter bag, extending the continuous working time of the filter bag, and ensuring the high efficiency of the fine particle filter 42 in trapping micron-sized pollutants. This solves the problem of traditional single-layer filter bags being affected by the impact of mixed particles. To address the issue of decreased filtration efficiency, during the dust removal stage, compressed gas is introduced into the air chamber 441 via the air supply pipe 53. The air inside the air chamber 441 pushes the piston 442, causing the connecting rod 443 to move downwards, disengaging the sealing plate 43 from the bottom opening of the housing 1. At this time, the scraper frame 51 descends with the sealing plate 43, and the cleaning scraper on its surface contacts and scrapes against the fine particle filter screen 42, removing the attached particles. Simultaneously, another stream of gas from the air supply pipe 53 is blown back into the housing 1 to pneumatically clean the coarse particle filter screen 41, effectively solving the problem of shortened filter bag life caused by incomplete dust removal in the existing technology.

[0032] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A filter bag with multi-stage filtration effect, comprising a shell (1), a multi-stage filtration assembly (4), and an anti-clogging and cleaning assembly (5), characterized in that: The top of the housing (1) is connected to an exhaust hood (2), and the left side of the top of the exhaust hood (2) is connected to an exhaust pipe (3); The multi-stage filtration assembly (4) includes two coarse particle filters (41), with one side of each coarse particle filter (41) fixedly connected to the housing (1). The inner cavity of the housing (1) is provided with a fine particle filter (42), and a sealing plate (43) is fitted on the bottom of the surface of the fine particle filter (42). A telescopic mechanism (44) is fixedly connected to the right side of the housing (1), and the left side of the bottom of the telescopic mechanism (44) is fixedly connected to the sealing plate (43). The anti-clogging cleaning component (5) includes two scraper brackets (51), the bottom of which is fixedly connected to the sealing plate (43). A reset mechanism (52) is fixedly connected to the left side of the housing (1), the bottom of which is fixedly connected to the sealing plate (43). An air supply pipe (53) is connected to the right side of the top of the exhaust hood (2).

2. The filter bag with multi-stage filtration effect according to claim 1, characterized in that: The telescopic mechanism (44) includes an air chamber (441), the left side of which is fixedly connected to the housing (1). A piston (442) is provided in the inner cavity of the air chamber (441). A connecting rod (443) is fixedly connected to the bottom of the piston (442). The bottom of the connecting rod (443) passes through the air chamber (441) and is fixedly connected to the sealing plate (43). A conduit (444) is connected to the top of the air chamber (441), and the top of the conduit (444) is connected to the air supply pipe (53).

3. A filter bag with multi-stage filtration effect according to claim 2, characterized in that: The surface of the connecting rod (443) is slidably connected to a sliding sleeve, the top of which is fixedly connected to the inner wall of the air chamber (441), and a solenoid valve (445) is installed on the surface of the conduit (444).

4. A filter bag with multi-stage filtration effect according to claim 1, characterized in that: The reset mechanism (52) includes a reset shell (521), the right side of which is fixedly connected to the shell (1). A limit plate (522) is provided in the inner cavity of the reset shell (521). A tension spring (523) is fixedly connected to the top of the limit plate (522), and a reset rod (524) is fixedly connected to the bottom of the limit plate (522). The bottom of the reset rod (524) passes through the reset shell (521) and is fixedly connected to the sealing plate (43).

5. A filter bag with multi-stage filtration effect according to claim 4, characterized in that: The limiting plate (522) has sliding grooves on both the front and rear sides, and the inner cavity of the sliding groove is slidably connected to a slide bar. The opposite sides of the two slide bars are fixedly connected to the inner wall of the reset shell (521).

6. A filter bag with multi-stage filtration effect according to claim 4, characterized in that: The top of the tension spring (523) is fixedly connected to the inner wall of the reset shell (521), and the bottom of the reset shell (521) is provided with an adjustment opening that works in conjunction with the reset rod (524).

7. A filter bag with multi-stage filtration effect according to claim 1, characterized in that: The scraper frame (51) includes multiple staggered cleaning scrapers, which are fixedly connected to each other by a column, and the bottom of the column is fixedly connected to the sealing plate (43).

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