CN113101726A

CN113101726A - Suction-blowing filtering system

Info

Publication number: CN113101726A
Application number: CN202110215609.0A
Authority: CN
Inventors: 陈旗新; 蒋雨洁; 张冠群; 曾永平
Original assignee: Jinan University
Current assignee: Jinan University
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-07-13
Anticipated expiration: 2041-02-26
Also published as: CN113101726B; WO2022179078A1

Abstract

The invention relates to the technical field of water treatment, in particular to a suction-blowing filtering system. The device comprises a roller filtering system, a gas conveying system and a liquid conveying system, wherein the roller filtering system is particularly suitable for filtering soft and easily blocked solids, and is connected with an air inlet and exhaust device through an air suction and blowing control system, and the roller filtering system automatically controls and manages raw liquid input and filtered liquid discharge through the liquid conveying system.

Description

Suction-blowing filtering system

Technical Field

The invention relates to the technical field of water, in particular to a suction-blowing filtering system.

Background

With the rapid development of domestic industry and agriculture, the water environment deteriorates, and blue algae and the like are caused to flood. Because the blue algae is very fine and sticky, the blue algae can easily pollute the filter medium, and the performance of the filter is rapidly reduced. The existing filtering technology mostly adopts continuous pressure, the filtering holes are easy to be plugged when soft solids are filtered, and once the filtering holes are plugged, the filtering net loses efficiency. Therefore, at present, the blue algae is rarely removed by adopting a filtering mode, and only the water body with lower blue algae concentration is filtered by using a sand pool, but sand pollution is caused.

In the invention patent with the publication number of CN108579199A, a blue algae filtering device is provided, impurities are filtered through a pre-filtering link, and a rubber scraper capable of cleaning blue algae filtering cloth is arranged, so that the cleanness of a blue algae filtering medium is kept, and the utilization rate is improved. However, the device provided by the invention only cleans the filter medium through the rubber scraper, and the blue algae particles are only a few microns in size, so that the blue algae particles are difficult to effectively scrape by the rubber scraper when being embedded into the filter cloth grids, so that the efficiency of the filter cloth is recovered.

Disclosure of Invention

The invention provides a suction-blowing filtration system for overcoming the problems of low filtration efficiency and easy blockage of soft solids in the prior art.

In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a inhale and blow filtration system, is including being used for solid-liquid separation's cylinder filtration system, gas delivery system and being used for carrying the stoste and the liquid delivery system who discharges the clear liquid for cylinder filtration system, cylinder filtration system is including the urceolus and the roll inner tube that the section of thick bamboo wall for the filter screen that fix on the base that cup joint mutually, forms airtight space and is equipped with the urceolus exhaust tube that is used for forming the firm solid of negative pressure suction between affiliated urceolus and the roll inner tube, the circumference roll can be done to the roll inner tube, cylinder filtration system still includes solid dehydration sweeps device and solid desorption and blows off the device to and desorption solid collection device.

In the technical scheme, a suction-blowing filtering system is a roller filtering system communicated with a gas conveying system and a liquid conveying system through arrangement, an outer barrel is utilized, a rolling inner barrel rotating relative to the circumferential direction of the outer barrel and negative pressure outside the rolling inner barrel are used for separating stock solution, the stock solution is guided into the rolling inner barrel through the liquid conveying system, air extraction operation is carried out on the outer barrel through the gas conveying system to form a negative pressure environment, a solid dehydration blowing device in the rolling inner barrel is used for drying solid exposed on a filter screen of the liquid level of the stock solution under the negative pressure of the outer barrel, and a solid desorption and blowing device utilizes gas to blow in a desorption solid collecting device which is influenced by the negative pressure in the outer barrel and adsorbs the solid adsorbed on the filter screen after drying, so that solid-liquid separation of.

Preferably, the outer cylinder comprises an upper cylinder and a lower cylinder which are connected in a sealing manner, the solid desorption stripping device is arranged on the inner wall of the outer cylinder and comprises a cavity structure isolated from the negative pressure of the upper cylinder and a first opening structure longitudinally distributed among the sealing baffles, the cavity structure is formed by the sealing baffles and the inner wall of the upper cylinder to form a cavity, and the solid dehydration purging device is communicated with a pressure air pipe used for providing positive pressure in the gas conveying system. In this technical scheme, solid desorption blows off the device and encloses into the isolated section of thick bamboo negative pressure of going up of cavity by seal baffle and last section of thick bamboo inner wall, and sealed solid desorption blows off the device and provides the malleation through the air-leg to first open structure, and first open structure adopts soft material can make solid desorption blow off the device and roll inner tube filter screen outer wall and form the sealing of certain degree, and can not cause the fish tail to damage the filter screen outer wall.

Preferably, one end of the desorption solid collecting device, which is close to the filter screen, is provided with a second opening structure opposite to the first opening structure, and the second opening structure is communicated to a collecting gas pipe for conveying through the desorption solid collecting device. In this technical scheme, the second open structure that sets up relatively with first open structure docks with first open structure, can inhale the collection from the filter screen on by the solid that gas blown down high-efficiently, the solid that blows down transports through collecting the trachea.

Preferably, the rolling inner cylinder is provided with a blowing device air inlet pipe connected with a solid dehydration blowing device, the head of the solid dehydration blowing device is an air injection slit with the length not less than the length of a filter screen of the rolling inner cylinder and parallel to a rolling shaft of the rolling inner cylinder, the air injection direction of the air injection slit is opposite to the rolling direction of the rolling inner cylinder downwards and is close to tangency or small angle with the inner wall of the rolling inner cylinder. In this technical scheme, the solid dehydration sweeps the device and can maintain the closely gas blowing to the filter screen when rolling the inner tube turnover, the gas injection slit of solid dehydration sweeps the device and carries out the operation of blowing to the solid that is adsorbed on the filter screen by the negative pressure, will not blow away by the solid-liquid that is absorbed together, makes the solid dehydration of being adsorbed weather, realizes the solid-liquid separation of solid.

Preferably, the gas conveying system is provided with a pressure gas pipe, a purging device gas inlet pipe, a collecting gas outlet pipe and an outer cylinder gas exhaust pipe. In this technical scheme, the trachea that sets up among the gas delivery system will connect external air supply and cylinder filtration system intercommunication, provide the required function of breathing in and bleed for cylinder filtration system's work.

Preferably, both ends of the rolling inner cylinder are provided with open tubular structures, the collecting air inlet pipe is connected with one end of the collecting air pipe in the rolling inner cylinder through the tubular structures, the other end of the collecting air pipe is connected with the collecting air outlet pipe, and the air inlet pipe of the purging device is connected into the rolling inner cylinder through the tubular structures. In the technical scheme, the collecting air inlet pipe is a flow-limiting open air pipe, the collecting air outlet pipe is connected with an external gas-solid separation device, the flow limitation of the collecting air inlet pipe and the air exhaust of the collecting air outlet pipe enable the collecting air pipe to have certain negative pressure, the negative pressure in the collecting air pipe sucks all solids blown off from the filter screen by the desorption solid collecting device into the collecting air pipe, the collecting air pipe conveys the collected solids to external gas-solid separation equipment for solid collection through the collecting air outlet pipe, the desorption solid collecting device is provided with an air throttle valve for adjusting air flow at the air suction pipe orifice, the air throttle valve arranged at the air suction pipe orifice of the desorption solid collecting device can adjust air inflow, in order to meet the blowing requirements of the system in different working capacities, the air inlet pipe of the blowing device is connected with the external air supply device, and the air inlet pipe of the blowing device is connected with the external air supply device to provide positive pressure air flow for the solid dehydration blowing device.

Preferably, the outer cylinder exhaust pipe is communicated with the upper cylinder and is not communicated with the solid desorption and stripping device, and a pressure air pipe is arranged at the position where the upper cylinder is communicated with the solid desorption and stripping device and is connected with an external air supply device. In the technical scheme, the outer cylinder air exhaust pipe can enable negative pressure to be formed between the outer cylinder and the rolling inner cylinder through air exhaust of the outer cylinder, so that solids are adsorbed on the filter screen, water in stock solution enters the outer cylinder through the filter screen to obtain filtered solution, solid-liquid separation of the stock solution is achieved, the solid desorption air-removal device is provided with pressure gas through the air compression pipe connected with the external air supply device, and the solid desorption air-removal device can implement positive pressure air blowing operation through the first opening structure.

Preferably, the liquid conveying system comprises a raw water inlet pipe, a clear water outlet pipe and a drain pipe, the raw water inlet pipe is introduced into the rolling inner cylinder through the tubular structure, the clear water outlet pipe is communicated and arranged at a position, lower than the tubular structure, on the outer cylinder, and the drain pipe is communicated and arranged at the bottom of the outer cylinder. In the technical scheme, stock solution is fed into the rolling inner cylinder through a raw water inlet pipe, filtered clear liquid without solids filtered out from a filter screen is discharged out of the outer cylinder through a clear water outlet pipe, and waste water generated by cleaning the outer cylinder and the like is drained through a drain pipe arranged at the bottom of the outer cylinder.

Preferably, the connecting part of the rolling inner cylinder and the outer cylinder on the tubular structure is provided with a waterproof sealing ring, two ends of the tubular structure are respectively provided with a belt pulley which is connected with power equipment and driven synchronously, the tubular structure at each end is supported on at least two rollers in a rolling manner, and the rollers are fixed on roller supports. In this technical scheme, the waterproof sealing washer on the tubular structure can maintain the space gas tightness between the interior urceolus, makes it keep the negative pressure, and synchronous drive's belt pulley can drive the rotation of rolling inner tube simultaneously through the tubular structure at both ends to avoid the inner tube filter screen to receive the moment of torsion, improve the stability of rolling inner tube when rotating.

Preferably, a liquid level sensor is arranged in the rolling inner cylinder and used for controlling the liquid level height in the rolling inner cylinder. In this technical scheme, the liquid level sensor of setting in the rolling inner tube can reflect the liquid level height in the rolling inner tube, and control raw water inlet valve carries out liquid level control, maintains the interior liquid level of rolling inner tube and is in the height that requires, avoids the liquid level too high to lead to the stoste to spill over, causes equipment damage and incident, perhaps the liquid level crosses lowly and influences filtration efficiency.

Compared with the prior art, the beneficial effects are: the device has the advantages that the device is provided with the roller filtering system communicated with the gas conveying system and the liquid conveying system, the stock solution is separated by the fixedly arranged outer cylinder and the rolling inner cylinder which rotates along the circumferential direction relative to the outer cylinder, solid-liquid separation is carried out on the solid on the filter screen of the rolling inner cylinder through the negative pressure of the outer cylinder, then the solid is collected in a blowing mode, the filter screen is kept in the optimal state all the time, and the solid filtering is efficiently realized.

Drawings

FIG. 1 is a schematic diagram of a suction-blow filtration system of the present invention;

FIG. 2 is a cross-sectional view of a suction-blow filtration system of the present invention;

FIG. 3 is a schematic diagram of the roller system of the suction-and-blow filtration system of the present invention;

fig. 4 is a sectional view of the solid desorption and stripping device of the suction-blow filtration system of the invention.

Description of reference numerals: the device comprises a base, 2 rollers, 3 pipeline supports, 4 outer cylinders, 41 upper cylinders, 42 lower cylinders, 5 rolling inner cylinders, 6 tubular structures, 7 roller supports, 8 belt pulleys, 9 raw water inlet pipes, 10 clear water outlet pipes, 11 blow-off pipes, 12 outer cylinder exhaust pipes, 13 air pressing pipes, 14 solid desorption and blow-off devices, 141 first opening structures, 15 sealing baffle plates, 16 desorption solid collecting devices, 161 second opening structures, 17 collecting air pipes, 18 collecting air inlet pipes, 19 collecting air outlet pipes, 20 solid dehydration and blowing devices, 201 air injection slits, 21 blowing device air inlet pipes and 22 sealing rings.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:

example 1

As shown in fig. 1 to 4, a suction-blowing filtration system comprises a roller filtration system for solid-liquid separation, a gas delivery system and a liquid delivery system for delivering stock solution and discharging filtered liquid for the roller filtration system, wherein the roller filtration system comprises an outer cylinder 4 fixed on a base 1 and a rolling inner cylinder 5 with a filter screen as a cylinder wall, which are sleeved with each other, an outer cylinder air suction pipe 12 for forming negative pressure to firmly suck solids is arranged between the outer cylinder 4 and the rolling inner cylinder 5, the rolling inner cylinder 5 can roll circumferentially, the roller filtration system further comprises a solid dehydration purging device 20, a solid desorption blow-off device 14 and a desorption solid collecting device 16.

In the embodiment, a suction-blowing filtration system is provided with a roller filtration system communicated with a gas conveying system and a liquid conveying system, solid-liquid separation is carried out on stock solution by utilizing an outer cylinder 4 and a rolling inner cylinder 5, the stock solution is guided into the rolling inner cylinder 5 through the liquid conveying system, air extraction operation is carried out on the outer cylinder 4 through the gas conveying system and an air extraction pipe 12 to form a negative pressure environment, along with the rolling of the rolling inner cylinder 5, a filter screen is sucked into a gap between the inner cylinder and the outer cylinder by the negative pressure between the inner cylinder and the outer cylinder in the process that the filter screen is rotated out of the water surface from the water body, and solids thicker than filter holes are intercepted by the filter screen, block the filter holes and rotate up along with; most other solids which are not sucked by the negative pressure of the filter holes flow down with the water and continue to wait for the suction of the filter holes. When the water and the solids which do not flow cleanly on the surface layer roll to the solid dehydration blowing device 20, the water and the solids flow back to the lower water body under the strong gas blowing, and only the solids sucked by the negative pressure on the innermost layer can continue to flow upwards through the blowing valve. When the solids sucked on the inner wall of the roller rotate to the position of the desorption solid collecting device 16 along with the filter screen, negative pressure is not suddenly generated, and the solids are blown off the inner wall of the rolling inner cylinder 5 and directly fall into the desorption solid collecting device 16 on the inner side of the inner cylinder of the roller under the action of strong pressure airflow from the solid desorption blow-off device 14 on the outer side of the inner cylinder, and the desorption solid collecting device 16 has certain negative pressure, so that the collection effect of the desorption solid collecting device 16 on the blown-off solids can be effectively improved.

Wherein, urceolus 4 includes a sealing connection's last section of thick bamboo 41 and a lower section of thick bamboo 42, and the solid desorption blows off device 14 and locates 4 inner walls of urceolus, including with the isolated cavity structures of last section of thick bamboo 41 negative pressure to and the first open structure 141 of vertical spread between seal baffle 15, cavity structures is enclosed into the cavity by seal baffle 15 and last section of thick bamboo 41 inner wall, and cavity structures is linked together with the pressure trachea 13 that is arranged in providing the malleation among the gas conveying system. In this embodiment, the solid desorption blow-off device 14 is enclosed by the sealing baffle 15 and the inner wall of the upper cylinder 41 to form a cavity to isolate the negative pressure of the upper cylinder 41, the sealed solid desorption blow-off device 14 provides positive pressure to the first opening structure 141 through the air pressing pipe 13, and the first opening structure 141 is made of soft material so that the solid desorption blow-off device 14 and the outer wall of the filter screen of the rolling inner cylinder 5 form a certain degree of sealing, and the outer wall of the filter screen cannot be scratched or damaged.

In addition, one end of the desorption solid collecting device 16 close to the filter screen is provided with a second opening structure 161 opposite to the first opening structure 141, and the second opening structure 161 is communicated to the collecting gas pipe 17 for transportation through the desorption solid collecting device 16. In this embodiment, the second opening structure 161 disposed opposite to the first opening structure 141 is abutted against the first opening structure 141, so that the solids blown off from the screen by the gas can be efficiently sucked and collected, and the blown solids are transported through the collecting gas pipe 17.

The air blowing device comprises a rolling inner cylinder 5, a blowing device air inlet pipe 21 connected with a solid dehydration blowing device 20, wherein the head of the solid dehydration blowing device 20 is an air blowing slit 201 which is not less than the length of a filter screen of the rolling inner cylinder 5, is parallel to a rolling shaft of the rolling inner cylinder 5 and is close to the inner wall of the rolling inner cylinder 5, and the air blowing direction of the air blowing slit is opposite to the rolling direction of the rolling inner cylinder 5 downwards and is close to tangency or a small angle with the inner wall of. In this embodiment, the solid dewatering and purging device 20 can maintain a close range of blowing to the filter screen when the rolling inner cylinder 5 rotates, the air blowing slit 201 of the solid dewatering and purging device 20 performs a blowing operation to the solid adsorbed on the filter screen by negative pressure, and blows off the solid and liquid not adsorbed together, so as to dewater and dry the adsorbed solid and realize solid-liquid separation of the solid.

In addition, the gas delivery system is provided with a pneumatic tube 13, a purge device inlet tube 21, a collection inlet tube 18, a collection outlet tube 19, and an outer cylinder exhaust tube 12. In this embodiment, the air pipe that sets up in the gas delivery system communicates external air supply and cylinder filtration system, provides the required function of breathing in and bleeding for cylinder filtration system's work.

Wherein, both ends of rolling inner tube 5 are provided with opening tubular structure 6, collect intake pipe 18 and roll inner tube 5 in collect one end of trachea 17 and be connected through tubular structure 6, collect the other end of trachea 17 and be connected with collection outlet duct 19, sweep device intake pipe 21 and insert in rolling inner tube 5 through tubular structure 6. In this embodiment, the collecting gas inlet pipe 18 is a flow-limiting open gas pipe, the collecting gas outlet pipe 19 is connected with an external gas-solid separation device, the flow limitation of the collecting gas inlet pipe 18 and the air suction of the collecting gas outlet pipe 19 enable a certain negative pressure to be present in the collecting gas pipe 17, all solids blown off from the filter screen by the desorption solid collecting device 16 and collected by the collecting gas pipe 17 are sucked into the collecting gas pipe 17, the collected solids are conveyed to the external gas-solid separation device for solid collection through the collecting gas outlet pipe 19 by the collecting gas pipe 17, the gas suction pipe mouth of the desorption solid collecting device 16 is provided with a gas throttle valve for adjusting gas flow, the gas throttle valve arranged at the gas suction pipe mouth, in order to meet the blowing requirements of the system in different working capacities, the air inlet pipe 21 of the blowing device is connected with an external air supply device, and the air inlet pipe 21 of the blowing device is connected with the external air supply device to provide positive pressure air flow for the solid dehydration blowing device 20.

The outer cylinder extraction pipe 12 is provided in the upper cylinder 41 so as to communicate with the solid desorption/desorption device 14, and a gas compression pipe 13 is provided in a portion of the upper cylinder 41 communicating with the solid desorption/desorption device 14, and the gas compression pipe 13 is connected to an external gas supply device. In this embodiment, the outer cylinder suction pipe 12 can form a negative pressure between the outer cylinder 4 and the rolling inner cylinder 5 by sucking air from the outer cylinder 4, so that the solid is adsorbed on the filter screen, and water in the stock solution enters the outer cylinder 4 through the filter screen to obtain a filtered solution, thereby realizing solid-liquid separation of the stock solution, and the solid desorption and desorption device 14 is supplied with pressure gas through the pressure gas pipe 13 connected to the external air supply device, so that the solid desorption and desorption device 14 can perform a positive pressure air blowing operation through the first opening structure 141.

The liquid conveying system comprises a raw water inlet pipe 9, a clear water outlet pipe 10 and a sewage discharge pipe 11, the raw water inlet pipe 9 is introduced into the rolling inner cylinder 5 through the tubular structure 6, the clear water outlet pipe 10 is communicated with the position, lower than the tubular structure 6, of the outer cylinder 4, and the sewage discharge pipe 11 is communicated with the bottom of the outer cylinder 4. In this embodiment, the raw liquid is fed into the rolling inner cylinder 5 through the raw water inlet pipe 9, the filtered liquid without solids filtered out from the filter screen is discharged out of the outer cylinder 4 through the clear water outlet pipe 10, and the waste water generated by cleaning the outer cylinder and the like is drained through the drain pipe 11 arranged at the bottom of the outer cylinder 4.

In addition, a waterproof sealing ring 22 is arranged at the connecting part of the rolling inner cylinder 5 and the outer cylinder 4 on the tubular structure 6, belt pulleys 8 which are connected with power equipment and synchronously driven are respectively arranged at two ends of the tubular structure 6, the tubular structure 6 at each end is supported on at least two rollers 2 in a rolling way, and the rollers 2 are fixed on a roller bracket 7. In this embodiment, the waterproof sealing ring 22 on the tubular structure 6 can maintain the air tightness of the space between the inner and outer cylinders 4, so that the space keeps a negative pressure, the synchronously driven belt pulley 8 can simultaneously drive the rolling inner cylinder 5 to rotate through the tubular structures 6 at the two ends, and prevent the inner cylinder filter screen from being subjected to torque, thereby improving the stability of the rolling inner cylinder 5 during rotation.

Wherein, be provided with level sensor in rolling inner tube 5, level sensor is used for controlling the interior liquid level height of rolling inner tube 5. In this embodiment, the liquid level sensor that sets up in rolling inner tube 5 can reflect the liquid level height in rolling inner tube 5, and control raw water inlet valve carries out liquid level control, maintains in the rolling inner tube 5 liquid level and is in the height that requires, avoids the liquid level too high to lead to the stoste to spill over, perhaps the liquid level crosses lowly and influences filtration efficiency.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A suction-blow filtration system characterized by: including cylinder filtration system, the gas conveying system who is used for solid-liquid separation and be used for cylinder filtration system to carry stoste and discharge the liquid conveying system who strains the clear liquid, cylinder filtration system is including urceolus (4) and the section of thick bamboo wall that fixes on base (1) that cup joints mutually roll inner tube (5) for the filter screen, forms airtight space and is equipped with urceolus exhaust tube (12) that are used for forming the solid of negative pressure absorption between affiliated urceolus (4) and the roll inner tube (5), roll inner tube (5) and can do circumference and roll, cylinder filtration system still includes solid dehydration sweeps device (20) and solid desorption and blows off device (14) to and desorption solid collection device (16).

2. The suction-blow filtration system of claim 1, wherein: the outer cylinder (4) comprises an upper cylinder (41) and a lower cylinder (42) which are connected in a sealing manner, the solid desorption stripping device (14) is arranged on the inner wall of the outer cylinder (4) and comprises a cavity structure isolated from the negative pressure of the upper cylinder (41) and a first opening structure (141) longitudinally distributed among the sealing baffles (15), the cavity structure is formed by surrounding the sealing baffles (15) and the inner wall of the upper cylinder (41) into a cavity, and the cavity structure is communicated with a gas pressing pipe (13) used for providing positive pressure in the gas conveying system.

3. The suction-blow filtration system of claim 2, wherein: one end of the desorption solid collecting device (16) close to the filter screen is provided with a second opening structure (161) opposite to the first opening structure (141), and the second opening structure (161) is communicated to a collecting air pipe (17) for conveying through the desorption solid collecting device (16).

4. The suction-blow filtration system of claim 3, wherein: roll inner tube (5) and be provided with the device intake pipe (21) that sweeps of connecting solid dehydration sweep device (20), solid dehydration sweeps device (20) head for length not less than roll inner tube (5) filter screen length and roll inner tube (5) parallel air injection slit (201) that are close to roll inner tube (5) inner wall, its air injection direction is downward and roll inner tube (5) roll opposite direction and be close tangent or be the small-angle with roll inner tube (5) inner wall.

5. The suction-blow filtration system of claim 1, wherein: the gas conveying system is provided with a pressure gas pipe (13), a purging device gas inlet pipe (21), a collecting gas inlet pipe (18), a collecting gas outlet pipe (19) and an outer cylinder gas extraction pipe (12).

6. The suction-blow filtration system of claim 5, wherein: the two ends of the rolling inner cylinder (5) are provided with opening tubular structures (6), the collecting air inlet pipe (18) is connected with one end of the collecting air pipe (17) in the rolling inner cylinder (5) through the tubular structures (6), the other end of the collecting air pipe (17) is connected with the collecting air outlet pipe (19), and the air inlet pipe (21) of the purging device is connected into the rolling inner cylinder (5) through the tubular structures (6).

7. The suction-blow filtration system of claim 5, wherein: the outer cylinder air exhaust pipe (12) is communicated with the upper cylinder (41) and is not communicated with the solid desorption and stripping device (14), the upper cylinder (41) is provided with a pressure air pipe (13) at the position communicated with the solid desorption and stripping device (14), and the pressure air pipe (13) is connected with an external air supply device.

8. The suction-blow filtration system of claim 1, wherein: the liquid conveying system comprises a raw water inlet pipe (9), a clear water outlet pipe (10) and a sewage discharge pipe (11), the raw water inlet pipe (9) is connected into the rolling inner cylinder (5) through the tubular structure (6), the clear water outlet pipe (10) is communicated with the position, lower than the tubular structure (6), on the outer cylinder (4), and the sewage discharge pipe (11) is communicated with the bottom of the outer cylinder (4).

9. The suction-blow filtration system of claim 1, wherein: the connecting part of the rolling inner cylinder (5) and the outer cylinder (4) on the tubular structure (6) is provided with a waterproof sealing ring (22), two ends of the tubular structure (6) are respectively provided with a belt pulley (8) which is synchronously driven and connected with power equipment, the tubular structure (6) at each end is supported on at least two rollers (2) in a rolling manner, and the rollers (2) are fixed on a roller support (7).

10. The suction-blow filtration system of claim 1, wherein: and a liquid level sensor is arranged in the rolling inner cylinder (5) and is used for controlling the liquid level height in the rolling inner cylinder (5).