Cleanable high-efficiency air filter

Abstract

The invention belongs to the technical field of air purification, and discloses a cleanable efficient air filter which comprises an outer box, an air inlet pipe, an exhaust pipe and a fan, a telescopic rod and a water storage tank are installed in an inner cavity of the outer box, the inner cavity of the water storage tank is filled with clear water, a connecting cylinder is installed at the telescopic end of the telescopic rod, and the connecting cylinder is connected with the air inlet pipe. A movable plate is fixedly mounted at the top of the connecting cylinder, a limiting cylinder located in the connecting cylinder is fixedly connected to the bottom of the movable plate, a filter cylinder is fixedly mounted at the bottom of the connecting cylinder, and a sealing ring is fixedly connected to the bottom of the filter cylinder. According to the device, the limiting cylinder is arranged to guide external air from the corrugated pipe and the air inlet pipe downwards, and when the external air turns over the limiting cylinder outwards, the external air is in full contact with the liquid level of clear water, so that most dust in the air can be absorbed, and the filtering burden of the filtering cylinder is reduced; and the loss condition of a traditional sealing element is directly avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of air purification, in particular to a washable high-efficiency air filter. Background Art

[0002] An air filter is a purification device used to filter solid particle impurities such as dust in the air. It is often used in home ventilation purification, factory ventilation and other fields. The air filter captures dust from the gas-solid two-phase flow through the action of its porous filter material and purifies the gas, so that the indoor air has a high degree of cleanliness, thereby greatly improving the indoor air quality. In the prior art, in order to avoid the trouble of replacing the air filter after long-term use, it is more common to design the filter to be rotatable, and place a part of the filter in water for a cycle to achieve the purpose of cleaning (restoring the filtering function). However, this design has the problems of poor sealing and low cleaning effect. First, the sealing side of the filter that is in continuous motion will inevitably wear after multiple frictions. After reaching the wear cycle, it also needs to be replaced. The filter is often covered with dust impurities and sticky when placed in the cleaning water, which makes the cleaning operation unable to proceed smoothly. Therefore, the filter after rotating back to its original position cannot play an effective filtering function and urgently needs to be improved. Summary of the invention

[0003] The object of the present invention is to provide a washable high-efficiency air filter to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a washable high-efficiency air filter, comprising an outer box, an air inlet pipe, an exhaust pipe and a fan, the inner cavity of the outer box is installed with a telescopic rod and a water storage tank, the inner cavity of the water storage tank is filled with clean water, the telescopic end of the telescopic rod is installed with a connecting cylinder, the top of the connecting cylinder is fixedly installed with a movable plate, the bottom of the movable plate is fixedly connected with a limiting cylinder located inside the connecting cylinder, the bottom of the connecting cylinder is fixedly installed with a filter cylinder, the bottom of the filter cylinder is fixedly connected with a sealing ring, the bottom of the sealing ring is immersed below the liquid level of the clean water, a bellows is connected and installed between the top of the movable plate and the inside of the outer box, the bellows is connected with the air inlet pipe, a drain pipe is installed at the bottom of the front of the water storage tank, a water inlet pipe is installed at the top of the back of the water storage tank, a motor is installed at the bottom of the water storage tank, the output shaft of the motor is fixedly connected with a support plate, the top of the support plate is fixedly connected with a connecting column, the top of the connecting column is fixedly connected with a fixing ring, and the outer surface of the fixing ring is fixedly connected with multiple groups of brushes.

[0005] As a preferred solution of the present invention, two groups of multiple connecting pipes symmetrically distributed front and back are fixedly connected to the top of the water storage tank, a transfer ring is fixedly connected to the top of the connecting pipe, a fan is installed on the outer surface of the outer box, the air outlet end of the fan is connected to the inner cavity of the transfer ring, and a plurality of groups of exhaust columns facing the axis of the limiting cylinder are fixedly installed on the outer surface of the connecting pipe at equal intervals longitudinally.

[0006] As a preferred solution of the present invention, a sealing cylinder is fixedly connected to the bottom of the support plate, and the bottom end of the sealing cylinder is in sealing contact with the bottom of the inner wall of the water storage tank.

[0007] As a preferred solution of the present invention, the number of the connecting pipes in each group is three, and they are evenly distributed at the outer edge of the top of the water tank in a fan shape.

[0008] As a preferred solution of the present invention, the top of the movable plate is provided with two groups of placement grooves 1 with the same number and distribution as those of the connecting pipe. The connecting pipe is placed in the placement groove 1 with a gap. The inner wall of the connecting pipe is provided with a placement groove 2 on the side facing the axis of the limiting cylinder, and the exhaust column can pass through the interior of the placement groove 2.

[0009] As a preferred solution of the present invention, the axial cross-section of the sealing ring is "L"-shaped, the inner diameter of the lower end of the sealing ring is larger than the inner diameter of the filter cartridge, and the outer end of the brush protrudes from the outer annular surface of the filter cartridge.

[0010] As a preferred solution of the present invention, the bottom of the limiting cylinder is higher than the liquid surface of the clean water, and the fixing ring and the brush are both located below the liquid surface of the clean water.

[0011] As a preferred solution of the present invention, the inner diameter of the limiting cylinder is smaller than the inner diameter of the filter cylinder, and the bottom of the limiting cylinder is lower than the bottom of the filter cylinder.

[0012] The beneficial effects of the present invention are as follows: 1. The device has been improved and optimized, and uses clean water to seal the filter cartridge, so that the air filtered by the filter cartridge can achieve a liquid seal function, which greatly improves the reliability of the device. The filter cartridge is designed to be cylindrical in shape, and a connecting cylinder and a sealing ring are installed above and below it respectively, so that the filter cartridge can be cleaned in all directions after entering the water storage tank. A water storage tank is provided below the filter cartridge and the sealing ring, and clean water is filled inside the water storage tank. When the telescopic rod drives the connecting cylinder, the filter cartridge and the sealing ring to move to the highest point, the bottom of the sealing ring is immersed below the liquid surface of the clean water, thereby providing a seal. By providing a limiting cylinder, the outside air from the bellows and the air inlet pipe is diverted downward, and when it is turned over the limiting cylinder, it is fully in contact with the liquid surface of the clean water, so that most of the dust in the air can be absorbed, thereby reducing the filtering burden of the filter cartridge. The device uses clean water to provide a bottom seal for the filter cartridge, which directly avoids the loss of traditional seals.

[0013] 2. Then, the device is also provided with a water storage tank and clean water, which can cooperate with a connecting cylinder, a filter cylinder and a sealing ring that can move downward with the telescopic rod, so as to realize the immersion and efficient brushing function of the filter cylinder. When the filter cylinder moves below the liquid level of the clean water, the static electricity can be effectively eliminated. While the filter cylinder moves downward, the brush is squeezed by the inner wall of the filter cylinder to form pressure for brushing the filter cylinder. The support plate, the connecting column, the fixing ring and the brush are driven by the motor to rotate so as to physically brush the impurities attached to the inner wall of the filter cylinder. At the same time, the immersion of clean water is also conducive to soaking away the impurities. When the support plate, the connecting column, the fixing ring and the brush are in the process of rotating, they will also drive the clean water to form a vortex in the inner cavity of the water storage tank, thereby taking away the impurities brushed off the inner wall of the filter cylinder. This design can effectively clean the inner wall of the water storage tank and improve the practicality of the device.

[0014] 3. The device is also designed with a connecting pipe and an exhaust column, and the exhaust column is aligned with the outer surface of the filter cartridge to air-dry the cleaned filter cartridge. After the cleaned filter cartridge moves upward and reset, a fan is provided and high-pressure air is pumped into the transfer ring and the connecting pipe. Under the guidance of the exhaust column, multiple groups of directional airflows are formed horizontally toward the outer surface of the filter cartridge, thereby drying the outer surface of the filter cartridge. Then, the high-pressure airflow passes through the surface of the filter cartridge and enters its inner cavity, blowing the moisture on the inner wall of the filter cartridge to the outer ring surface of the limiting cylinder, and gathers into water droplets to flow back to the water storage tank, thereby making the cleaning and drying of the filter cartridge more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a partial separation schematic diagram of the internal structure of the present invention; Figure 2 It is a schematic diagram of the front appearance of the overall structure of the present invention; Figure 3 It is a front cutaway schematic diagram of the overall structure of the present invention; Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at center A; Figure 5 It is a side cutaway schematic diagram of the overall structure of the present invention; Figure 6 It is a schematic diagram of the internal structure of the present invention; Figure 7 It is a top view cutaway schematic diagram of the outer box of the present invention; Figure 8 It is a schematic diagram of the overall separation of the internal structure of the present invention.

[0016] In the figure: 1. outer box; 2. air inlet pipe; 3. exhaust pipe; 4. fan; 5. motor; 6. drain pipe; 7. water inlet pipe; 8. water storage tank; 9. clean water; 10. sealing cylinder; 11. support plate; 12. connecting column; 13. fixing ring; 14. brush; 15. telescopic rod; 16. movable plate; 17. bellows; 18. connecting cylinder; 19. filter cylinder; 20. sealing ring; 21. transfer ring; 22. connecting pipe; 23. exhaust column; 24. limiting cylinder; 25. placement slot one; 26. placement slot two. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figures 1 to 8 As shown, an embodiment of the present invention provides a washable high-efficiency air filter, including an outer box 1, an air inlet pipe 2, an exhaust pipe 3 and a fan 4, a telescopic rod 15 and a water storage tank 8 are installed in the inner cavity of the outer box 1, the inner cavity of the water storage tank 8 is filled with clean water 9, a connecting cylinder 18 is installed at the telescopic end of the telescopic rod 15, a moving plate 16 is fixedly installed on the top of the connecting cylinder 18, a limiting cylinder 24 located inside the connecting cylinder 18 is fixedly connected to the bottom of the moving plate 16, a filter cylinder 19 is fixedly installed at the bottom of the connecting cylinder 18, and a sealing ring 20 is fixedly connected to the bottom of the filter cylinder 19. The bottom of the sealing ring 20 is immersed below the liquid level of the clean water 9, a bellows 17 is installed between the top of the movable plate 16 and the inside of the outer box 1, the bellows 17 is connected to the air inlet pipe 2, a drain pipe 6 is installed at the bottom of the front of the water storage tank 8, a water inlet pipe 7 is installed at the top of the back of the water storage tank 8, a motor 5 is installed at the bottom of the water storage tank 8, the output shaft of the motor 5 is fixedly connected to the support plate 11, the top of the support plate 11 is fixedly connected to the connecting column 12, the top of the connecting column 12 is fixedly connected to the fixing ring 13, and the outer surface of the fixing ring 13 is fixedly connected to multiple groups of brushes 14; The device is improved and optimized, and uses clean water 9 to seal the filter cartridge 19, so that the air filtered by the filter cartridge 19 can achieve a liquid seal function, which greatly improves the reliability of the device. The filter cartridge 19 is designed to be cylindrical in shape, and a connecting cylinder 18 and a sealing ring 20 are installed above and below it, respectively, so that the filter cartridge 19 can be cleaned in all directions after entering the water storage tank 8. The water storage tank 8 is provided below the filter cartridge 19 and the sealing ring 20, and clean water 9 is filled inside the water storage tank 8. When the telescopic rod 15 drives the connecting cylinder 18 and the sealing ring 20 to move, the filter cartridge 19 can be cleaned in all directions. When the filter cartridge 19 and the sealing ring 20 move to the highest point, the bottom of the sealing ring 20 is immersed below the liquid surface of the clean water 9, thereby providing a seal. By providing a limiting cylinder 24, the outside air from the bellows 17 and the air inlet pipe 2 is guided downward, and when it is turned outward over the limiting cylinder 24, it is in full contact with the liquid surface of the clean water 9, thereby being able to absorb most of the dust in the air, thereby reducing the filtering burden of the filter cartridge 19. The device uses clean water 9 to provide a bottom seal for the filter cartridge 19, directly avoiding the loss of traditional seals.

[0019] Then, the device is also provided with a water storage tank 8 and clean water 9, which cooperate with a connecting tube 18, a filter tube 19 and a sealing ring 20 that can be driven downward by the telescopic rod 15, so as to realize the immersion and efficient brushing function of the filter tube 19. When the filter tube 19 moves below the liquid level of the clean water 9, the static electricity can be effectively eliminated. While the filter tube 19 moves downward, the brush 14 is squeezed by the inner wall of the filter tube 19 to form a pressure for brushing the filter tube 19. The support plate 11, the connecting column 12, the fixing ring 13 and the brush 14 are driven by the motor 5 to rotate so as to physically brush the impurities attached to the inner wall of the filter tube 19. At the same time, the immersion of the clean water 9 is also conducive to soaking away the impurities. When the support plate 11, the connecting column 12, the fixing ring 13 and the brush 14 are rotating, they will also drive the clean water 9 to form a vortex in the inner cavity of the water storage tank 8, thereby taking away the impurities brushed off the inner wall of the filter tube 19. This design can effectively clean the inner wall of the water storage tank 8 and improve the practicality of the device.

[0020] Among them, two groups of multiple connecting pipes 22 symmetrically distributed front and back are fixedly connected to the top of the water storage tank 8, and the top of the connecting pipe 22 is fixedly connected to the transfer ring 21. The outer surface of the outer box 1 is installed with a fan 4, and the air outlet end of the fan 4 is connected to the inner cavity of the transfer ring 21. The outer surface of the connecting pipe 22 is longitudinally equidistantly fixed with multiple groups of exhaust columns 23 facing the axis of the limiting cylinder 24; The device is also designed with a connecting pipe 22 and an exhaust column 23, and the exhaust column 23 is aligned with the outer surface of the filter cartridge 19 to air-dry the cleaned filter cartridge 19. After the cleaned filter cartridge 19 moves upward and resets, a fan 4 is provided and high-pressure air is pumped into the transfer ring 21 and the connecting pipe 22. Under the guidance of the exhaust column 23, multiple groups of directional airflows are formed horizontally toward the outer surface of the filter cartridge 19, thereby drying the outer surface of the filter cartridge 19. Then, the high-pressure airflow passes through the surface of the filter cartridge 19 and enters its inner cavity, blowing the moisture on the inner wall of the filter cartridge 19 toward the outer ring surface of the limiting cylinder 24, and gathers into water droplets to flow back into the water storage tank 8, thereby making the cleaning and drying of the filter cartridge 19 more efficient.

[0021] The bottom of the support plate 11 is fixedly connected with a sealing cylinder 10, and the bottom end of the sealing cylinder 10 is in sealing contact with the bottom of the inner wall of the water storage tank 8; The sealing cylinder 10 is used to seal between the clean water 9 and the output shaft of the motor 5 , and the bottom of the sealing cylinder 10 can prevent the clean water 9 from entering the motor 5 .

[0022] There are three connecting pipes 22 in each group, which are evenly distributed at the outer edge of the top of the water storage tank 8 in a fan-shaped manner; like Figure 7 As shown, multiple groups of connecting pipes 22 and exhaust columns 23 are horizontally facing the outer side of the filter cartridge 19, which completely covers the outer side of the filter cartridge 19 with high-pressure airflow blown out by the exhaust columns 23, avoiding dead corners in the drying of the outer side of the filter cartridge 19.

[0023] The top of the movable plate 16 is provided with two sets of placement grooves 25 of the same number and distribution as the connecting pipe 22. The connecting pipe 22 is placed in the placement groove 25 with a gap. A placement groove 26 is provided on the inner wall of the connecting pipe 22 facing the axis of the limiting cylinder 24. The exhaust column 23 can pass through the inside of the placement groove 26. The connecting pipe 22 and the exhaust column 23 are fixedly installed on the top of the water tank 8, and the telescopic rod 15 needs to drive the movable plate 16 and the connecting tube 18 to move downward as a whole. At this time, the placement groove 1 25 and the placement groove 26 opened on the surface of the movable plate 16 are just for the connecting pipe 22 and the exhaust column 23 to "pass relative to each other".

[0024] The axial cross-section of the sealing ring 20 is in an "L" shape, the inner diameter of the lower end of the sealing ring 20 is greater than the inner diameter of the filter cartridge 19, and the outer end of the brush 14 protrudes from the outer annular surface of the filter cartridge 19; The function of the sealing ring 20 is to contact with the clean water 9 and be partially immersed below the liquid surface of the clean water 9, thereby providing a dynamic seal for the bottom opening of the filter cartridge 19. When the filter cartridge 19 moves downward, the filter cartridge 19 can also be cleaned. At this time, the brush 14 will be squeezed by the inner wall of the filter cartridge 19, so that the inner wall of the filter cartridge 19 can be effectively brushed when it rotates at high speed.

[0025] The bottom of the limiting cylinder 24 is higher than the liquid level of the clean water 9, and the fixing ring 13 and the brush 14 are both located below the liquid level of the clean water 9; A gap needs to be left between the limiting cylinder 24 and the liquid surface of the clean water 9 to facilitate the passage of air therethrough. However, when the air passes therethrough, it will inevitably come into contact with the clean water 9, thereby achieving the purpose of absorbing some of the dust in the air.

[0026] The inner diameter of the limiting cylinder 24 is smaller than the inner diameter of the filter cylinder 19, and the bottom of the limiting cylinder 24 is lower than the bottom of the filter cylinder 19; The limiting cylinder 24 is located inside the filter cylinder 19 and is responsible for changing the flow direction of the air so that the air can be controlled in the path of the device and contact the clean water 9. After increasing the flow rate, it speeds up the passage through the filter cylinder 19 and completes the filtration.

[0027] Working principle: First, the air inlet pipe 2 is connected to the outside world, and the exhaust pipe 3 enters the internal fan; During filtering, negative pressure is generated inside the device from the air inlet pipe 2, the bellows 17, the limiting cylinder 24, the inside of the filter cylinder 19, the outside of the filter cylinder 19, the inner cavity of the outer box 1 to the exhaust pipe 3, that is, the filtered air channel. When the external air enters the inner cavity of the limiting cylinder 24, it will move downward under the limiting action of the limiting cylinder 24 and contact the liquid surface of the clean water 9. Since a relatively narrow channel is formed between the bottom of the limiting cylinder 24 and the liquid surface of the clean water 9, the air flow rate increases. When the air contacts the clean water 9, part of the dust will be absorbed and enter the clean water 9. Then, the air turns over the inner ring surface of the limiting cylinder 24 and accelerates upward. At this time, the temperature of the air drops after contacting the clean water 9 (the air flow rate, that is, the kinetic energy, increases, and its internal energy must be consumed, and the overall energy is converted from internal energy to kinetic energy), and it is filtered through the filter cylinder 19, leaving impurities on the inner ring surface of the filter cylinder 19. The filtered air enters the inner cavity of the outer box 1 and is discharged upward through the exhaust pipe 3 into the room or factory; During cleaning, due to the setting of the limiting cylinder 24, the air to be filtered contacts the filter cylinder 19 from bottom to top. Therefore, the impurities below the inner wall of the filter cylinder 19 are more than those above it. The telescopic rod 15 is started, and the filter cylinder 19 and the sealing ring 20 are driven to move downward through the connecting cylinder 18 and the moving plate 16. The filter cylinder 19 and the sealing ring 20 gradually enter the clean water 9. When the filter cylinder 19 contacts the brush 14, the brush 14 is squeezed and bent. While the filter cylinder 19 descends, the motor 5 is started, and the support plate 11, the connecting column 12, the fixing ring 13 and the brush 14 are driven to rotate, and the inner annular surface of the downwardly moving filter cylinder 19 is scrubbed. The impurities on the inner wall of the filter cylinder 19 are scrubbed away by the brush 14. After cleaning, the telescopic rod 15 is started to rise, and the connecting cylinder 18, the filter cylinder 19 and the sealing ring 20 are driven to reset. Finally, start the fan 4 and pump clean high-pressure air into the inner cavity of the transfer ring 21. The high-pressure air is sprayed toward the outer surface of the filter cartridge 19 through multiple groups of connecting pipes 22 and exhaust columns 23, and the surface of the filter cartridge 19 is air-dried. The moisture flows back to the water storage tank 8 along the inner and outer walls of the filter cartridge 19, and the impurities entering the clean water 9 gradually sink to the bottom during the normal filtration process of the filter cartridge 19, and are discharged through the drain pipe 6 and then replenished through the water inlet pipe 7.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A washable high-efficiency air filter, comprising an outer box (1), an air inlet pipe (2), an exhaust pipe (3) and a fan (4), wherein a telescopic rod (15) and a water storage tank (8) are installed in the inner cavity of the outer box (1), characterized in that: The inner cavity of the water storage tank (8) is filled with clean water (9); the telescopic end of the telescopic rod (15) is installed with a connecting cylinder (18); a movable plate (16) is fixedly installed on the top of the connecting cylinder (18); the bottom of the movable plate (16) is fixedly connected to a limiting cylinder (24) located inside the connecting cylinder (18); a filter cylinder (19) is fixedly installed on the bottom of the connecting cylinder (18); a sealing ring (20) is fixedly connected to the bottom of the filter cylinder (19); the bottom of the sealing ring (20) is immersed below the liquid level of the clean water (9); the top of the movable plate (16) and the inner surface of the outer box (1) are connected. A bellows (17) is installed between the two parts, the bellows (17) is connected to the air inlet pipe (2), a drain pipe (6) is installed at the bottom of the front of the water storage tank (8), a water inlet pipe (7) is installed at the top of the back of the water storage tank (8), a motor (5) is installed at the bottom of the water storage tank (8), an output shaft of the motor (5) is fixedly connected to a support plate (11), a connecting column (12) is fixedly connected to the top of the support plate (11), a fixing ring (13) is fixedly connected to the top of the connecting column (12), and a plurality of groups of brushes (14) are fixedly connected to the outer surface of the fixing ring (13).

2. A washable high efficiency air filter according to claim 1, characterized in that: The top of the water storage tank (8) is fixedly connected to two groups of multiple connecting pipes (22) symmetrically distributed front and back, and the top of the connecting pipe (22) is fixedly connected to a transfer ring (21). The outer surface of the outer box (1) is equipped with a fan (4), and the air outlet end of the fan (4) is connected to the inner cavity of the transfer ring (21). The outer surface of the connecting pipe (22) is fixedly equipped with multiple groups of exhaust columns (23) equidistantly spaced longitudinally and facing the axis of the limiting cylinder (24).

3. A washable high efficiency air filter according to claim 2, characterized in that: The bottom of the support plate (11) is fixedly connected to a sealing cylinder (10), and the bottom end of the sealing cylinder (10) is in sealing contact with the bottom of the inner wall of the water storage tank (8).

4. A washable high efficiency air filter according to claim 3, characterized in that: The number of the connecting pipes (22) in each group is three, and they are evenly distributed in a fan-shaped manner at the outer edge of the top of the water storage tank (8).

5. A washable high efficiency air filter according to claim 4, characterized in that: The top of the movable plate (16) is provided with two groups of placement grooves (25) of the same number and distribution as the connecting tube (22); the connecting tube (22) is placed in the placement grooves (25) with a gap, and the inner wall of the connecting tube (22) is provided with a placement groove (26) on the side facing the axis of the limiting cylinder (24); the exhaust column (23) can pass through the interior of the placement grooves (26).

6. A washable high efficiency air filter according to claim 5, characterized in that: The axial cross-section of the sealing ring (20) is in an "L" shape, the inner diameter of the lower end of the sealing ring (20) is greater than the inner diameter of the filter cartridge (19), and the outer end of the brush (14) protrudes from the outer annular surface of the filter cartridge (19).

7. A washable high efficiency air filter according to claim 6, characterized in that: The bottom of the limiting cylinder (24) is higher than the liquid surface of the clean water (9), and the fixing ring (13) and the brush (14) are both located below the liquid surface of the clean water (9).

8. A washable high efficiency air filter according to claim 7, characterized in that: The inner diameter of the limiting cylinder (24) is smaller than the inner diameter of the filter cylinder (19), and the bottom of the limiting cylinder (24) is lower than the bottom of the filter cylinder (19).

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