Anti-clogging self-cleaning metal filter bag

Abstract

The application provides a metal filter bag capable of preventing blockage and self-cleaning. The metal filter bag capable of preventing blockage and self-cleaning comprises a metal ring, a connecting plate fixedly connected in the metal ring, and a first elastic telescopic pipe fixedly connected to the connecting plate. The axial "folding-expanding" alternating deformation and high-frequency elastic shaking of the first filter bag and the second filter bag can make the hard shell layer produce bending deformation through the instantaneous axial telescoping of the first filter bag and the second filter bag, and the hard shell layer can be broken and peeled due to the bending stress, and the axial shearing force can effectively peel the high-viscosity dust layer, thereby overcoming the problem that the existing pulse back blowing cannot completely clean the compacted hard shell and high-viscosity dust. Especially in the high-humidity or high-viscosity dust working condition, the dust is easily firmly adhered in a paste or lump shape. The existing pulse back blowing can remove the surface dust, but the radial expansion range of the compacted hard shell layer and the high-viscosity paste dust is limited, and it is difficult to provide sufficient mechanical shearing force, so that the dust cleaning effect is limited.

Description

Technical Field

[0001] This application relates to the field of filter bag technology, specifically to a self-cleaning, anti-clogging metal filter bag. Background Technology

[0002] Industrial production processes generate flue gas, which needs to be filtered to remove dust before it can be released. Metal dust collector filter bags are sometimes used in flue gas filtration. These filter bags are typically high-temperature filter bags made of sintered metal fibers and metal powders. They are oxidation resistant, washable and reusable, and can operate stably in high-temperature environments. They are commonly used in high-temperature flue gas dust removal and SCR denitrification technology.

[0003] In existing technologies, during the filtration of flue gas, dust gradually adheres to and accumulates on the surface of the filter bag. After prolonged operation, a thick dust layer forms on the surface of the filter bag. If not cleaned in time, the dust layer will continue to thicken, leading to decreased air permeability of the filter bag, reduced filtration efficiency, and even affecting the normal air extraction of the fan. To address this, some methods employ mechanical vibration, using a vibration device to vibrate the filter bag and shake off the dust adhering to its surface. Other methods use pulse backflushing, periodically injecting high-pressure gas into the filter bag to create a reverse airflow that blows the dust out. However, in high-dust-concentration environments such as cement plants, dust will clump together and adhere firmly to the surface of the filter bags; in high-humidity environments, dust will adhere to the surface of the filter bags in a viscous paste; some industrial dusts are inherently highly viscous, or may cause bag clogging under high temperature and moisture conditions. For these clump-like or viscous stubborn dusts, existing mechanical vibration or pulse backflushing methods are difficult to clean thoroughly, and their dust removal effect is limited. They cannot provide sufficient mechanical shearing force to effectively peel off the stubborn dust, resulting in a continuous decrease in the air permeability of the filter bags and affecting the filtration efficiency of the exhaust gas. In addition, existing filter bags lack corresponding protective measures during dust removal. The dust removed can easily re-adhere to the surface of the filter bag itself or adjacent filter bags under the influence of flue gas flow. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the purpose of this application is to provide a self-cleaning, anti-clogging metal filter bag.

[0005] The anti-clogging self-cleaning metal filter bag described in this application includes a metal ring, a connecting plate fixedly connected inside the metal ring, a first elastic telescopic tube fixedly connected to the connecting plate, a cross fixedly connected to the fixing part of the first elastic telescopic tube, a plurality of first elastic sheets arranged in a ring fixedly connected to the cross, the first elastic sheets being arranged in a wavy shape, and a fixing cylinder connected to the first elastic sheets fixedly connected to the telescopic part of the first elastic telescopic tube. A first filter bag is fixedly attached to the outside of the first elastic sheet. The first filter bag is corrugated in shape. A connecting ring is rotatably connected inside the metal ring. A plurality of second elastic sheets arranged in a ring are fixedly attached to the lower side of the connecting ring. One end of the second elastic sheet is rotatably connected to the fixed cylinder. The second elastic sheet is wavy. A second filter bag located on the outer ring surface of the first filter bag is fixedly attached to the outside of the second elastic sheet. The second filter bag is corrugated in shape. The mesh on the second filter bag is larger than the mesh on the first filter bag, and a cavity is formed between the two.

[0006] Furthermore, it is particularly preferred that the fixed end of the first elastic telescopic tube is rotatably connected to a rotating ring, and the rotating ring is fixedly connected to a fan and a plurality of connecting rods arranged in a ring from top to bottom, with one end of each connecting rod being fixedly connected to the connecting ring.

[0007] Furthermore, it is particularly preferred that a first scraper for cleaning dust from the surface of the first filter bag is fixedly connected to the lower side of the connecting ring. The first scraper has elastic deformation capability, and one end of the first scraper is fixedly connected to a second elastic sheet.

[0008] Furthermore, it is particularly preferred that the surface of the first filter bag is fixed with a plurality of first protrusions that act on the first scraper in an axially distributed manner.

[0009] Furthermore, it is particularly preferred that a second scraper for cleaning dust from the surface of the second filter bag is fixedly attached to the lower side of the metal ring, the second scraper having elastic deformation capability.

[0010] Furthermore, it is particularly preferred that the surface of the second filter bag is fixed with a plurality of second protrusions that are axially distributed and act on the second scraper.

[0011] Furthermore, it is particularly preferred that the bottom of the fixed cylinder is provided with a plurality of feeding grooves arranged in a ring, the expansion and contraction section of the first elastic expansion tube is fixedly connected with a valve, the bottom of the expansion and contraction section of the first elastic expansion tube is fixedly connected with a plurality of second elastic expansion tubes arranged in a ring, the expansion and contraction section of the second elastic expansion tube is fixedly connected with an L-shaped plate, and a sealing plate for sealing the feeding groove is fixedly connected to the L-shaped plate.

[0012] Furthermore, it is particularly preferred that the upper surface of the sealing plate is set as an inclined surface.

[0013] Furthermore, it is particularly preferred that the connecting ring has multiple ventilation slots arranged in a ring, the connecting plate has multiple air inlet pipes fixedly connected to it, the air inlet pipes have a first annular plate that contacts the connecting ring, the first annular plate has a hollow inner cavity, and the first annular plate has an air outlet that communicates with the inner cavity, the air outlet on the first annular plate is connected to the ventilation slots, the air inlet pipes are connected to a connecting pipe that passes through the metal ring, the connecting pipes have a second annular plate fixedly connected to it, the second annular plate has a hollow inner cavity, and the second annular plate has an air outlet that communicates with the inner cavity.

[0014] Furthermore, it is particularly preferred that the air outlets on the first annular plate and the air outlets on the second annular plate are both configured in an inverted V-shape.

[0015] The anti-clogging, self-cleaning metal filter bag described in this application has the following advantages: A. Because the mesh size of the second filter bag is larger than that of the first filter bag, the second filter bag will intercept, screen, and adsorb larger dust particles in the flue gas onto its outer wall. This provides an initial interception effect for the dust in the flue gas and also helps to share the burden with the first filter bag, thus preventing all the dust in the flue gas from adhering to the first filter bag and affecting the passage of the flue gas.

[0016] B. Since both the first and second filter bags are corrugated, the filtration contact area can be increased and the air permeability filtration performance can be improved. Meanwhile, the rotating first scraper removes the dust adhering to the outer surface of the first filter bag, while the second scraper removes the dust from the rotating surface of the second filter bag. This achieves a preliminary cleaning effect on the first and second filter bags, thus preventing excessive dust from adhering to their surfaces and causing them to become clogged in a short time, which would affect their ability to filter and separate flue gas and dust.

[0017] C. The first protrusion will contact the first scraper and force the first scraper to bend slightly. Then, as the first scraper continues to rotate, when the first scraper passes the first protrusion, the instantaneous rebound force generated by the elastic recovery causes it to strike the first filter bag, forcing the first filter bag to vibrate, thereby further peeling off the fine dust adhering to its surface. At the same time, the rotating second protrusion will contact the second scraper and force the second scraper to bend slightly. As the second protrusion continues to rotate, when the second scraper passes the second protrusion, the instantaneous rebound force generated by the elastic recovery causes it to strike the second filter bag, forcing the second filter bag to vibrate, thereby peeling off the larger dust particles adhering to its surface.

[0018] D. After the pulse valve closes, the elastic component retracts, and the first and second filter bags quickly rebound, causing the first and second filter bags to undergo alternating axial "folding-expansion" deformation and high-frequency elastic vibration. This instantaneous axial expansion and contraction of the first and second filter bags causes the hard shell layer to bend and deform, resulting in the hard shell layer breaking and peeling off due to bending stress. The axial shear force effectively peels off the highly viscous dust layer, thus overcoming the problem of incomplete cleaning of compacted hard shells and highly viscous dust in existing pulse backflushing systems. Especially under high humidity or high-viscosity dust conditions, dust tends to adhere firmly in a pasty or lumpy form. Although existing pulse backflushing can remove surface dust, its radial expansion range is limited for compacted hard shells and highly viscous pasty dust, making it difficult to provide sufficient mechanical shear force, resulting in limited cleaning effect.

[0019] E. A downward blowing airflow is generated through the ventilation slots, which in turn blows the cleaned dust downwards, preventing it from drifting around in the cavity between the first and second filter bags with the flue gas. This would prevent the cleaned dust from re-adhering to the outer and inner surfaces of the first and second filter bags. At the same time, some air in the inlet pipe will also enter the second annular plate through the connecting pipe and be blown downwards through the air outlet on the second annular plate, thus blowing the cleaned dust downwards. This prevents the dust from being re-adhered to itself or the surface of the adjacent second filter bag due to the flow of flue gas during the cleaning process. Attached Figure Description

[0020] Figure 1 This is a first-view perspective three-dimensional structural diagram of a self-cleaning, anti-clogging metal filter bag as described in this application; Figure 2 This is a second perspective three-dimensional structural diagram of the anti-clogging self-cleaning metal filter bag described in this application; Figure 3 This is a first partial cross-sectional view of a self-cleaning, anti-clogging metal filter bag as described in this application; Figure 4 This is a second partial cross-sectional view of a self-cleaning, anti-clogging metal filter bag as described in this application; Figure 5 This is an enlarged view of point A of the anti-clogging self-cleaning metal filter bag described in this application; Figure 6 This is an exploded view of the anti-clogging self-cleaning metal filter bag described in this application; Figure 7 This is a schematic diagram of the structure of 13-second scraper and 14-second protrusion of the anti-clogging self-cleaning metal filter bag described in this application; Figure 8This is a third partial cross-sectional view of a self-cleaning, anti-clogging metal filter bag as described in this application; Figure 9 This is a fourth partial cross-sectional view of a self-cleaning, anti-clogging metal filter bag as described in this application.

[0021] Explanation of reference numerals in the attached drawings: 1-Metal ring, 2-Connecting plate, 3-First elastic telescopic tube, 4-Cross, 5-First elastic sheet, 6-Fixing cylinder, 61-Discharge trough, 7-First filter bag, 8-Connecting ring, 81-Ventilation slot, 9-Second elastic sheet, 10-Second filter bag, 11-First scraper, 12-First protrusion, 13-Second scraper, 14-Second protrusion, 15-Valve, 16-Second elastic telescopic tube, 17-L-shaped plate, 18-Sealing plate, 21-Rotating ring, 22-Connecting rod, 23-Fan, 31-Air inlet pipe, 32-First annular plate, 33-Connecting pipe, 34-Second annular plate. Detailed Implementation

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] To simplify the disclosure of this invention, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials. Example 1

[0024] A type of anti-clogging, self-cleaning metal filter bag, such as Figure 1-7As shown, it includes a metal ring 1, a connecting plate 2 fixed inside the metal ring 1, a first elastic telescopic tube 3 fixed on the connecting plate 2, a cross 4 fixed on the fixing part of the first elastic telescopic tube 3, a plurality of first elastic pieces 5 arranged in a ring fixed on the cross 4, the first elastic pieces 5 are arranged in a wave shape, and a fixing cylinder 6 connected to the first elastic pieces 5 is fixed on the telescopic part of the first elastic telescopic tube 3. A first filter bag 7 is fixedly connected to the outer side of the first elastic sheet 5. The first filter bag 7 is corrugated in shape. A connecting ring 8 is rotatably connected inside the metal ring 1. Multiple second elastic sheets 9 arranged in a ring are fixedly connected to the lower side of the connecting ring 8. One end of the second elastic sheet 9 is rotatably connected to the fixed cylinder 6. The second elastic sheet 9 is wavy. A second filter bag 10 located on the outer ring surface of the first filter bag 7 is fixedly connected to the outer side of the second elastic sheet 9. The second filter bag 10 is corrugated in shape. The mesh on the second filter bag 10 is larger than the mesh on the first filter bag 7, and a cavity is formed between the two.

[0025] The fixed end of the first elastic telescopic tube 3 is rotatably connected to a rotating ring 21. The rotating ring 21 is fixedly connected to a fan 23 and a number of connecting rods 22 arranged in a ring from top to bottom. One end of the connecting rod 22 is fixedly connected to the connecting ring 8.

[0026] A first scraper 11 for cleaning dust from the surface of the first filter bag 7 is fixedly connected to the lower side of the connecting ring 8. The first scraper 11 has elastic deformation capability, and one end of the first scraper 11 is fixedly connected to the second elastic sheet 9.

[0027] The surface of the first filter bag 7 has multiple first protrusions 12 that are axially distributed and act on the first scraper 11.

[0028] A second scraper 13 for cleaning dust from the surface of the second filter bag 10 is fixedly attached to the lower side of the metal ring 1. The second scraper 13 has elastic deformation capability.

[0029] The surface of the second filter bag 10 has multiple axially distributed second protrusions 14 that act on the second scraper 13.

[0030] In use, the metal ring 1 is first fixed to the tube sheet of the filter box, so that the entire filter bag assembly is vertically suspended inside the dust-laden air chamber of the filter box. Then, during operation, under the action of the induced draft fan, the flue gas passes through the second filter bag 10 and the first filter bag 7 from the outside to the inside. During this process, since the mesh on the second filter bag 10 is larger than the mesh on the first filter bag 7, the second filter bag 10 will intercept, screen and adsorb larger dust particles in the flue gas onto the outer wall of the second filter bag 10. Thus, the second filter bag 10 plays a preliminary interception role for the dust in the flue gas, and also plays a role in sharing the burden of the first filter bag 7, so as to prevent all the dust in the flue gas from adhering to the first filter bag 7 and affecting the passage of the flue gas. Then, the flue gas will continue to pass through the first filter bag 7, which will intercept the fine dust in the flue gas, thus ensuring that the dust entrained in the flue gas is further removed, while the clean gas passes through the first filter bag 7 and enters its inner cavity, and finally is discharged through the first filter bag 7 and the upper outlet of the metal ring 1. Meanwhile, during the flue gas treatment process, since both the first filter bag 7 and the second filter bag 10 are corrugated, the filtration contact area can be increased and the air permeability filtration performance can be improved. Simultaneously, when clean gas is discharged outwards, the flowing gas will contact the fan 23. Using a top-down view as a reference, the fan 23 and the rotating ring 21 will rotate clockwise on the first elastic telescopic tube 3. The connecting rod 22, connecting ring 8, second elastic sheet 9, second filter bag 10, first scraper 11, and second protrusion 14 follow the rotating ring 21. The first scraper 11 rotates and then scrapes off the dust adhering to the outer surface of the first filter bag 7, while the second scraper 13 scrapes off the dust on the surface of the rotating second filter bag 10. This achieves the effect of initial cleaning of the first filter bag 7 and the second filter bag 10, thereby avoiding excessive dust adhering to the surface of the first filter bag 7 and the second filter bag 10, which could easily cause the first filter bag 7 and the second filter bag 10 to be blocked in a short time, thus affecting the filtration and separation of flue gas and dust by the first filter bag 7 and the second filter bag 10. Meanwhile, as the first scraper 11 rotates, the first protrusion 12 will contact the first scraper 11 and force the first scraper 11 to bend slightly. Then, as the first scraper 11 continues to rotate, when the first scraper 11 passes the first protrusion 12, the instantaneous rebound force generated by the elastic recovery causes it to strike the first filter bag 7, forcing the first filter bag 7 to vibrate, thereby further peeling off the fine dust adhering to its surface. At the same time, the rotating second protrusion 14 will contact the second scraper 13 and force the second scraper 13 to bend slightly. As the second protrusion 14 continues to rotate, when the second scraper 13 passes the second protrusion 14, the instantaneous rebound force generated by the elastic recovery causes it to strike the second filter bag 10, forcing the second filter bag 10 to vibrate, thereby peeling off the larger dust particles adhering to its surface. Next, after prolonged operation of the first filter bag 7 and the second filter bag 10, the thin layer of dust remaining after long-term scraping by the first scraper 11 and the second scraper 13 gradually hardens under repeated compaction, forming a hard shell layer that the first scraper 11 and the second scraper 13 cannot effectively remove, resulting in a continuous decrease in the air permeability of the filter bags. At this time, the pulse cleaning system is activated, the pulse valve opens instantly, and high-pressure airflow is injected into the inner cavity of the first elastic telescopic tube 3 from the upper end, causing its internal air pressure to rise instantly. This air pressure forces the telescopic part of the first elastic telescopic tube 3 to extend, driving the fixed cylinder 6 to move downward, stretching the first elastic plate 5, the second elastic plate 9, the first scraper 11 and the second scraper 13. At the same time, the first filter bag 7 and the second filter bag 10 are axially stretched. After the pulse valve closes, the elastic components retract, and the first... The filter bag 7 and the second filter bag 10 rebound rapidly, causing the first filter bag 7 and the second filter bag 10 to undergo alternating axial "folding-expansion" deformation and high-frequency elastic vibration. This instantaneous axial expansion and contraction of the first filter bag 7 and the second filter bag 10 causes the hard shell layer to bend and deform, resulting in the hard shell layer breaking and peeling off due to bending stress. The axial shear force effectively peels off the highly viscous dust layer, thus overcoming the problem of incomplete cleaning of compacted hard shells and highly viscous dust in existing pulse backflushing systems. Especially under high humidity or high-viscosity dust conditions, dust tends to adhere firmly in a pasty or lumpy form. Although existing pulse backflushing can remove surface dust, its radial expansion range is limited for compacted hard shells and highly viscous pasty dust, making it difficult to provide sufficient mechanical shear force, resulting in limited cleaning effect. Example 2

[0031] Based on Example 1, such as Figure 8 As shown, the bottom of the fixed cylinder 6 is provided with a plurality of annularly distributed feeding grooves 61. A valve 15 is fixedly connected inside the telescopic part of the first elastic telescopic tube 3. A plurality of annularly distributed second elastic telescopic tubes 16 are fixedly connected to the bottom of the telescopic part of the first elastic telescopic tube 3. An L-shaped plate 17 is fixedly connected to the telescopic part of the second elastic telescopic tube 16. A sealing plate 18 for sealing the feeding grooves 61 is fixedly connected to the L-shaped plate 17.

[0032] The upper surface of the sealing plate 18 is set as a slope.

[0033] It should be noted that the dust cleaned by the first scraper 11 on the surface of the first filter bag 7, as well as the broken and peeled hardened dust layer, will fall into the bottom of the fixed cylinder 6 through the cavity formed between the first filter bag 7 and the second filter bag 10, and be supported by the sealing plate 18. Then, after the high-pressure airflow is injected into the inner cavity of the first elastic telescopic tube 3 from the upper end, after the telescopic part of the first elastic telescopic tube 3 extends to its maximum value, the air pressure inside the first elastic telescopic tube 3 will force the valve 15 to open, and the gas will enter the second elastic telescopic tube 16 through the valve 15, causing the telescopic part of the second elastic telescopic tube 16 to extend. This causes the L-shaped plate 17 and the sealing plate 18 to move downwards, thereby opening the feeding trough 61. This allows the cleaned dust and the broken and peeled hard shell dust layer to fall into the collection hopper inside the filter box through the feeding trough 61. At the same time, the dust supported on the sealing plate 18 will also slide down its inclined surface, thus preventing dust from accumulating on the sealing plate 18. After the pulse valve is closed, the gas at the bottom of the first elastic telescopic tube 3 will force the valve 15 to open and be discharged through the valve 15. The telescopic part of the second elastic telescopic tube 16 will change from the extended state to the normal state. During this change, the L-shaped plate 17 and the sealing plate 18 will move upwards and reset. Example 3

[0034] Based on Example 2, such as Figure 9 As shown, the connecting ring 8 has multiple ventilation slots 81 arranged in a ring. The connecting plate 2 is fixed with multiple air inlet pipes 31. The air inlet pipes 31 are fixed with a first annular plate 32 that contacts the connecting ring 8. The first annular plate 32 has a hollow inner cavity and an air outlet that communicates with the inner cavity. The air outlet on the first annular plate 32 is connected to the ventilation slots 81. The air inlet pipes 31 are connected with a connecting pipe 33 that passes through the metal ring 1. The connecting pipe 33 is fixed with a second annular plate 34. The second annular plate 34 has a hollow inner cavity and an air outlet that communicates with the inner cavity.

[0035] The air outlets on the first annular plate 32 and the second annular plate 34 are both designed in an inverted V-shape.

[0036] It should be noted that the air inlet pipe 31 is equipped with a one-way valve to prevent flue gas from escaping outward through the air inlet pipe 31. The air inlet pipe 31 is connected to an external pump through a delivery pipe. Furthermore, during the rotation of the connecting ring 8, the first annular plate 32 is always in contact with the connecting ring 8 to prevent flue gas between the first filter bag 7 and the second filter bag 10 from overflowing outward through the ventilation slot 81. Next, during the cleaning of the first filter bag 7 and the second filter bag 10, an external pump is controlled to deliver air to the air inlet pipe 31 via a delivery pipe. The air flows into the first annular plate 32 through a one-way valve, and then through the air outlet on the first annular plate 32 to the ventilation groove 81 of the connecting ring 8. Finally, the ventilation groove 81 generates a downward blowing airflow, which can blow the cleaned dust downwards, preventing the cleaned dust from drifting around in the cavity between the first filter bag 7 and the second filter bag 10 with the smoke, thus causing the cleaned dust to re-adhere to the outer surface of the first filter bag 7 and the inner surface of the second filter bag 10. At the same time, some of the air in the air inlet pipe 31 will also enter the second annular plate 34 through the connecting pipe 33 and be blown downwards through the air outlet on the second annular plate 34, thereby blowing the cleaned dust downwards, preventing the cleaned dust from being re-attached to itself or the surface of the adjacent second filter bag 10 due to the flow of smoke during the cleaning of the second filter bag 10. It should be noted that when air is blown out from the air outlet on the first annular plate 32 and the air outlet on the second annular plate 34, since the air outlets are both designed in an inverted V-shape, the flow cross section gradually narrows as the air flows through this structure, thus significantly increasing the wind speed. This increased wind speed enhances the downward pressure and carrying capacity of the airflow on the dust, allowing the cleaned dust to be guided to the lower collection area more quickly. On the other hand, the high-speed airflow can effectively cut off the suspension and diffusion path of the dust in the cavity, reducing the chance of secondary contact between the dust and the surfaces of the first filter bag 7 and the second filter bag 10, thereby improving the cleaning effect and reducing the degree of re-contamination of the first filter bag 7 and the second filter bag 10.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A self-cleaning, clogging-resistant metal filter bag, characterized in that, Includes a metal ring (1), a connecting plate (2) fixed inside the metal ring (1), a first elastic telescopic tube (3) fixed on the connecting plate (2), a cross (4) fixed on the fixing part of the first elastic telescopic tube (3), a plurality of first elastic pieces (5) arranged in a ring fixed on the cross (4), the first elastic pieces (5) are arranged in a wave shape, and a fixed cylinder (6) connected to the first elastic pieces (5) is fixed on the telescopic part of the first elastic telescopic tube (3). A first filter bag (7) is fixedly attached to the outside of the first elastic sheet (5). The first filter bag (7) is corrugated in shape. A connecting ring (8) is rotatably connected inside the metal ring (1). A plurality of second elastic sheets (9) are fixedly attached to the lower side of the connecting ring (8) in an annular distribution. One end of the second elastic sheet (9) is rotatably connected to the fixed cylinder (6). The second elastic sheet (9) is wavy. A second filter bag (10) located on the outer ring surface of the first filter bag (7) is fixedly attached to the outside of the second elastic sheet (9). The second filter bag (10) is corrugated in shape. The mesh on the second filter bag (10) is larger than the mesh on the first filter bag (7), and a cavity is formed between the two.

2. The anti-clogging self-cleaning metal filter bag according to claim 1, characterized in that, The fixed end of the first elastic telescopic tube (3) is rotatably connected to a rotating ring (21). The rotating ring (21) is fixedly connected to a fan (23) and a plurality of connecting rods (22) arranged in a ring from top to bottom. One end of the connecting rod (22) is fixedly connected to the connecting ring (8).

3. The anti-clogging self-cleaning metal filter bag according to claim 1, characterized in that, The lower side of the connecting ring (8) is fixedly connected to a first scraper (11) for cleaning dust from the surface of the first filter bag (7). The first scraper (11) has elastic deformation capability, and one end of the first scraper (11) is fixedly connected to a second elastic sheet (9).

4. The anti-clogging self-cleaning metal filter bag according to claim 3, characterized in that, The surface of the first filter bag (7) is fixed with a plurality of first protrusions (12) that are axially distributed and act on the first scraper (11).

5. The anti-clogging self-cleaning metal filter bag according to claim 1, characterized in that, The metal ring (1) is fixed to the lower side with a second scraper (13) for cleaning dust from the surface of the second filter bag (10), and the second scraper (13) has elastic deformation capability.

6. The anti-clogging self-cleaning metal filter bag according to claim 5, characterized in that, The surface of the second filter bag (10) is fixed with a plurality of second protrusions (14) that are axially distributed and act on the second scraper (13).

7. The anti-clogging self-cleaning metal filter bag according to claim 1, characterized in that, The bottom of the fixed cylinder (6) is provided with a plurality of annularly distributed feeding grooves (61). A valve (15) is fixedly connected inside the telescopic part of the first elastic telescopic tube (3). A plurality of annularly distributed second elastic telescopic tubes (16) are fixedly connected to the bottom of the telescopic part of the first elastic telescopic tube (3). An L-shaped plate (17) is fixedly connected to the telescopic part of the second elastic telescopic tube (16). A sealing plate (18) for sealing the feeding grooves (61) is fixedly connected to the L-shaped plate (17).

8. The anti-clogging self-cleaning metal filter bag according to claim 7, characterized in that, The upper surface of the sealing plate (18) is set as an inclined surface.

9. The anti-clogging self-cleaning metal filter bag according to claim 8, characterized in that, The connecting ring (8) has multiple ventilation slots (81) arranged in a ring. The connecting plate (2) is fixed with multiple air inlet pipes (31). The air inlet pipes (31) are fixed with a first annular plate (32) that contacts the connecting ring (8). The first annular plate (32) has a hollow inner cavity and an air outlet that communicates with the inner cavity. The air outlet on the first annular plate (32) is connected to the ventilation slots (81). The air inlet pipes (31) are connected with a connecting pipe (33) that passes through the metal ring (1). The connecting pipe (33) is fixed with a second annular plate (34). The second annular plate (34) has a hollow inner cavity and an air outlet that communicates with the inner cavity.

10. The anti-clogging self-cleaning metal filter bag according to claim 9, characterized in that, The air outlets on the first annular plate (32) and the second annular plate (34) are both designed in an inverted V-shape.

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