WO2022127011A1

WO2022127011A1 - Water filtering equipment and working method thereof

Info

Publication number: WO2022127011A1
Application number: PCT/CN2021/093337
Authority: WO
Inventors: 陈海鹰; 檀冰; 王道新; 邱汝彬
Original assignee: 福州海恒水务设备有限公司
Priority date: 2020-12-15
Filing date: 2021-05-12
Publication date: 2022-06-23
Also published as: CN112386969A

Abstract

Water filtering equipment and a working method thereof. The water filtering equipment comprises a cylindrical tank (2) of which the upper part is provided with a sewage inlet (1), an air-water backwashing chamber (3) disposed at the bottom in the cylindrical tank (2), and filtering layers (4) disposed in the cylindrical tank (2) and located above the air-water backwashing chamber (3). An air-water backwashing mechanism (5) is provided in the air-water backwashing chamber (3). The air-water backwashing mechanism (5) comprises a lower central pipe (8) of which the pipe wall is provided with an air washing port (6) and a water washing port (7), and a backwashing air inlet pipe (9) and a backwashing water inlet pipe (10) that separately communicate with the lower central pipe (8) and is disposed on the periphery. A plurality of air ports (11) are formed in the backwashing air inlet pipe (9) in the length direction thereof, and a plurality of drainage ports (12) are formed in the backwashing water inlet pipe (10) in the length direction thereof. An upper central pipe (13) that is closed at the bottom surface is provided in the cylindrical tank (2) and located above the air-water backwashing chamber (3). A sewage overflow inlet (14) is formed in the upper central pipe (13). The lower side portion of the upper central pipe (13) is provided with a sewage drainage pipe (15) extending out of the air-water backwashing chamber (3). During filtration, sewage enters the cylindrical tank (2) from the sewage inlet (1), water to be filtered enters the air-water backwashing chamber (3), the backwashing air inlet pipe (9), and the lower central pipe (8) after being sequentially filtered by the filtering layers (4) one by one, and finally the filtered water is discharged from a water washing pipe (28) on the lower central pipe (8).

Description

Water filtration equipment and its working method

technical field

The present invention relates to a water filtration device and its working method.

Background technique

Filtration is an important process for water treatment. The conventional filter tank mainly uses quartz sand as the filter material. During filtration, the filtered water passes through the water inlet valve and the square hole from the main water inlet channel, overflows the weir mouth, and then enters the V-shaped groove through the side hole. It enters the filter tank through the V-shaped groove and the water distribution hole at the bottom of the V-shaped groove respectively. After the filtered water passes through the filter material layer from top to bottom, it is collected by the water distribution system and enters the clear water tank; when the effluent quality does not meet the requirements or the filter layer When the water head loss reaches the maximum value, the filter tank needs to be backwashed. In order to keep the filter material layer in a suspended state, the backwash gas and water pass through the filter material layer from bottom to top through the water distribution system. The sand particles begin to move, causing the sand particles to rub and collide with each other, and the sludge attached to the surface of the sand particles falls off during the friction between the sand particles. ..

technical problem

Traditional water filtration equipment is generally made by pouring, the internal structure is complex, the construction is cumbersome, the production cycle is long, the flexibility is poor, and it is inconvenient to use.

technical solutions

The present invention improves the above problems, that is, the technical problem to be solved by the present invention provides a water filtration device and a working method thereof. The water filtration device has a simple structure, is convenient to manufacture, and is flexible to use.

The water filtration equipment of the present invention is characterized in that it comprises a cylindrical tank with a sewage water inlet on the upper part, a gas-water backwash chamber arranged in the bottom of the cylindrical tank, and a gas-water backwash chamber provided in the cylindrical tank and located above the gas-water backwash chamber. The filter layer, the air and water recoil chamber is provided with an air and water recoil mechanism, and the air and water recoil mechanism includes a lower center pipe with an air wash port and a water wash port on the pipe wall, and a lower center pipe with an air wash port and a water wash port on the pipe wall. The backwash air inlet pipe and the backwash water inlet pipe are connected by pipes. The backwash air inlet pipe is provided with a plurality of air ports along its length direction, and the backwash water inlet pipe is provided with a plurality of drain ports along its length direction. An upper center pipe with a closed bottom is arranged above the gas-water recoil chamber, a sewage overflow inlet is arranged on the upper center pipe, and a sewage pipeline extending out of the gas-water recoil chamber is arranged on the lower side of the upper center pipe.

Further, the above-mentioned cylindrical tank is a cylindrical stainless steel tank body, and a circle of cofferdam plates is arranged on the inner wall surface of the cylindrical tank and on the side of the sewage inlet, and the cofferdam plate and the inner wall surface of the cylindrical tank form a ring shape. Grooves with serrations on the upper edge of the cofferdam plate.

Further, a plurality of support rods are arranged between the inner wall surface of the cylindrical tank and the upper central pipe.

Further, the filter layer is located between the inner wall surface of the cylindrical tank and the upper central tube, and the filter layer includes a fine quartz sand filter material layer and a coarse quartz sand filter material layer.

Further, the plate surface of the air-water backflushing chamber in contact with the filter layer has filter holes or a long-handled filter cap.

Further, the upper port of the upper central pipe is higher than the upper surface of the filter layer.

Further, the above-mentioned backwash intake pipe includes an intake annular pipe and a plurality of backwash intake branch pipes for connecting the lower central pipe and the intake annular pipe, and the backwash water intake pipe includes a water intake annular pipe and a plurality of The backwash water inlet branch pipe connecting the water inlet annular pipe and the lower central pipe.

Further, the side part of the lower central pipe is provided with a water washing pipe extending out of the air-water backwash chamber, and the end of the water washing pipe is communicated with the water washing port; the side part of the lower central pipe is provided with an air wash extending out of the air-water backwash chamber The air wash pipe is communicated with the air wash port, and the air wash port is located above the water wash port of the water inlet pipe.

The working method of the water filtration equipment of the present invention is characterized in that: the water filtration equipment comprises a cylindrical tank with a sewage water inlet on the upper part, a gas-water backwash chamber provided in the cylindrical tank with a closed bottom, and a cylindrical tank provided in the cylindrical tank. The filter layer is located above the gas-water recoil chamber. The gas-water recoil chamber is provided with an air and water recoil mechanism. The air and water recoil mechanism includes a lower center with an air wash port and a water wash port on the pipe wall. The pipe and its periphery are provided with a backwash air inlet pipe and a backwash water inlet pipe respectively communicating with the lower central pipe. The backwash air inlet pipe is provided with a plurality of air ports along its length direction, and the backwash water inlet pipe is provided with a plurality of air ports along its length direction. Drainage outlet, in the cylindrical tank and above the gas-water recoil chamber, there is an upper center pipe with a closed bottom surface, the upper end of the upper center pipe is provided with a sewage overflow inlet, and the lower side of the upper center pipe is provided with a protruding gas-water counter. The sewage pipeline of the flushing chamber; when the filtration is working, the sewage enters the cylindrical tank from the sewage water inlet, and the filtered water enters the air-water backwashing chamber, the backwashing water inlet pipe and the lower central pipe after being filtered layer by layer of the filter layer. Finally, the filtered water is discharged from the water washing pipe on the lower center pipe.

When the filter structure works for a period of time, when the dirt in the filter layer reaches a considerable amount, the filtration resistance of the filter layer increases, resulting in a decrease in the amount of filtration. At this time, the filter layer needs to be backwashed to remove the dirt in the filter layer. Backflushing and discharging of the material to restore the filtration capacity of the filter layer; during backflushing, first, only high-pressure gas is used to disperse the dirt, then high-pressure water flushing and high-pressure gas flushing are performed together, and finally, only high-pressure water flushing is performed; When the high-pressure gas is used to disperse the dirt, the inflatable equipment is used to blow air into the interior through the air wash pipe, and the gas flows from the inside of the lower center pipe through the backwash intake pipe, air port, air-water backwash chamber and long-handled filter cap in turn. The filter layer will wash away the impurities deposited on the filter layer; when high-pressure water is flushed, the high-pressure flushing water will be passed into the water washing pipe, and the water will flow from the inside of the lower center pipe through the backwashing water inlet pipe, the water outlet, and the gas-water backwashing chamber in turn. And the long handle filter cap enters the filter layer, and the water flows through the filter layer to wash the impurities filtered and deposited on the filter layer. Pipeline discharge; when high-pressure water flushing and high-pressure air flushing are carried out together, the above two methods are carried out simultaneously, that is, the water for high-pressure flushing is introduced into the water washing pipe and the high-pressure gas is introduced into the air-washing pipe.

beneficial effect

Compared with the prior art, the present invention has the following beneficial effects: the device is simple in structure, reasonable in design, convenient in use, good in sewage filtration and backwashing effect, convenient in production and manufacture, flexible in movement, convenient in replacement and maintenance, and suitable for different use scenarios .

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the present invention;

Fig. 2 is the partial structure schematic diagram of Fig. 1;

Figure 3 is a perspective view of the gas and water recoil mechanism;

Fig. 4 is the top view of gas, water recoil mechanism;

Fig. 5 is the water flow schematic diagram of filtered water;

Figure 6 is a schematic diagram of water flow during backwashing.

Embodiments of the present invention

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

The water filtration equipment of the present invention comprises a cylindrical tank 2 with a sewage water inlet 1 on the upper part, a gas-water backwash chamber 3 provided in the cylindrical tank 2 with a closed bottom, and a gas-water backwash chamber 3 provided in the cylindrical tank 2 and located above the gas-water backwash chamber The filter layer 4, the space in the gas-water recoil chamber 3 is relatively airtight, not absolutely closed, the gas-water recoil chamber 3 is provided with an air and water recoil mechanism 5, and the gas and water recoil mechanism 5 Including the lower center pipe 8 with the air washing port 6 and the water washing port 7 on the pipe wall, the backwash air inlet pipe 9 and the backwash water inlet pipe 10 which are respectively communicated with the lower center pipe 8 are arranged on the periphery, and the backwash air inlet pipe 9 is along its length. There are a plurality of air ports 11 in the direction of the backwash water inlet pipe 10, and a plurality of drain ports 12 are provided along the length direction of the backwash water inlet pipe 10. In the cylindrical tank 2 and above the air-water backwash chamber 3, there is an upper center with a closed bottom surface. Pipe 13, the upper end of the upper center pipe is provided with a sewage overflow inlet 14, the lower side of the upper center pipe is provided with a sewage pipe 15 extending out of the gas-water backwash chamber, the outer periphery of the cylindrical tank 2 and the gas-water backwash chamber 3 The wall surface can be integrally made into a cylindrical shell, and a diaphragm 16 is arranged in the lower part of the cylindrical shell, so that the cylindrical shell, its bottom surface and the diaphragm form a closed gas-water recoil chamber 3, and the upper central pipe The lower central tube and the upper central tube can be coaxial tube bodies, and the parts where the upper central tube and the lower central tube are connected with the diaphragm can be reinforced by reinforcing rib plates.

During the filtration work, the sewage enters the cylindrical tank from the sewage inlet. After the filtered water and the sewage are filtered layer by layer, they enter the air-water backwash chamber, the backwash water inlet pipe and the lower center pipe. Finally, the filtered water It is discharged from the water washing pipe on the lower center pipe.

Preferably, the above-mentioned cylindrical tank is a cylindrical stainless steel tank, which is convenient to manufacture and has good structural stability. The weir plate 30, the cofferdam plate and the inner wall of the cylindrical tank form an annular groove 17, and the upper edge of the cofferdam plate has serrations 18. After the sewage enters the tank from the sewage inlet 1, it flows to the annular groove. 17, after the sewage overflows in the annular groove 17, it flows from the sawtooth 18 into the filter layer 4 from the overflow, and the sewage enters the air-water backwash chamber 3 after being filtered by the filter layer 4.

In order to improve the connection strength between the tank body and the upper center pipe, a number of support rods 31 are arranged between the inner wall surface of the cylindrical tank and the upper center pipe. The cylindrical tank has 2-4 layers, and each layer is evenly distributed with 2-4 support rods Rod 31.

For the convenience of manufacture, the above-mentioned filter layer 4 is located between the inner wall surface of the cylindrical tank and the upper central tube. The filter layer 4 includes a fine quartz sand filter material layer 19 and a coarse quartz sand filter material layer 20 from top to bottom in turn. The thickness of the quartz sand filter material layer 19 may be 1-8 times the thickness of the coarse quartz sand filter material layer 20 .

In order to make the filtration effect good, the plate surface of the gas-water backflushing chamber in contact with the filter layer (ie, the diaphragm 16 ) has filter holes or installed filters, and the filter can be selected as a long-handled filter cap 27 .

In order to make the sewage discharge effect good, the upper port of the upper central pipe (ie the sewage overflow inlet 14) is higher than the upper surface of the filter layer, and the upper end of the upper central pipe has a positive conical shell 21 and a reverse conical shell 22 connected to each other, Adopting the design of the forward conical shell 21 and the reverse conical shell 22 (the upper port of the upper central pipe is small) is beneficial to avoid the reverse flow of sewage entering the upper central pipe.

Further, for the sake of reasonable design, the above-mentioned backflushing intake pipe 9 includes an intake annular pipe 23 and a plurality of backflushing intake branch pipes 24 for connecting the lower central pipe 8 and the intake annular pipe 23. The backflushing water intake pipe 10 It includes a water inlet annular pipe 25 and a plurality of backwash water inlet branch pipes 26 for connecting the water inlet annular pipe and the lower central pipe. The diameters of the gas ring pipe 23 and the water inlet ring pipe 25 can be different and can be located at different heights. The backwash air inlet branch pipe 24 and the backwash water inlet branch pipe 26 are radially distributed, and several are evenly distributed in the circumferential direction. , the air port 11 is arranged on the inlet annular pipe 23 and the backwash inlet branch pipe 24, and the water outlet 12 is arranged on the water inlet annular pipe 25 and the backwash water inlet branch pipe 26. When the water is filtered, the water will pass through the filter layer 4, the long-handled filter cap 27, the gas-water backwash chamber 3, the drain port 12, the lower center pipe 8 and the water washing pipe in turn. When using water, the water passes through the water washing pipe, the lower central pipe 8, the water outlet 12, the gas-water backwash chamber 3, the long-handled filter cap 27 and the filter layer 4 in sequence.

The side part of the lower central pipe is provided with a water washing pipe 28 extending out of the gas-water backwash chamber, and the end of the water washing pipe is communicated with the water washing port 7; 29, the air wash pipe is communicated with the air wash port 6, the air wash port is located above the water wash port of the water inlet pipe, and the water wash pipe 28 and the air wash pipe 29 are connected with opening and closing valves to control the on-off of water or gas.

An air wash branch pipe 32 is branched on the air wash pipe 29, and the end of the air wash branch pipe 32 is connected to the top of the annular groove 17, so as to facilitate the air wash, make the dirt more easily flow into the filter layer, and also help the air wash to be located in the filter layer. There is an opening and closing valve on the air washing branch pipe 32.

The working method of the water filtration equipment of the present invention, the water filtration equipment comprises a cylindrical tank with a sewage water inlet on the upper part, a gas-water backwash chamber provided in the cylindrical tank and closed at the bottom, and a gas-water recoil chamber provided in the cylindrical tank and located in the gas-water The filter layer above the recoil chamber, the air-water recoil chamber is provided with an air and water recoil mechanism, and the air and water recoil mechanism includes a lower center pipe with an air wash port and a water wash port on the pipe wall, and a peripheral setting There are a backwash air inlet pipe and a backwash water inlet pipe which are respectively communicated with the lower central pipe. The backwash air inlet pipe is provided with a plurality of air ports along its length direction, and the backwash water inlet pipe is provided with a plurality of drain ports along its length direction. Inside the cylindrical tank and above the gas-water recoil chamber, there is an upper center pipe with a closed bottom surface, the upper end of the upper center pipe is provided with a sewage overflow inlet, and the lower side of the upper center pipe is provided with a sewage outlet extending out of the air-water recoil chamber. Pipeline; the dirt overflowing into the upper center pipe is discharged through the sewage pipe on the lower side of the upper center pipe.

When the filter structure works for a period of time, when the dirt in the filter layer reaches a considerable amount, the filtration resistance of the filter layer increases, resulting in a decrease in the amount of filtration. At this time, the filter layer needs to be backwashed to remove the dirt in the filter layer. Backflushing and discharging of the material to restore the filtration capacity of the filter layer; during backflushing, first, only high-pressure gas is used to disperse the dirt, then high-pressure water flushing and high-pressure gas flushing are performed together, and finally, only high-pressure water flushing is performed; When the high-pressure gas is used to disperse the dirt, the inflatable equipment is used to blow air into the interior through the air wash pipe, and the gas flows from the inside of the lower center pipe through the backwash intake pipe, air port, air-water backwash chamber and long-handled filter cap in turn. The filter layer will wash away the impurities deposited on the filter layer; when high-pressure water is flushed, the high-pressure flushing water will be passed into the water washing pipe, and the water will flow from the inside of the lower center pipe through the backwashing water inlet pipe, the water outlet, and the gas-water backwashing chamber in turn. And the long handle filter cap enters the filter layer, and the water flows through the filter layer to wash the impurities filtered and deposited on the filter layer. Pipeline discharge; when high-pressure water flushing and high-pressure air flushing are carried out together, that is, the above two methods are carried out at the same time, that is, high-pressure flushing water is introduced into the water washing pipe and high-pressure gas is introduced into the air-washing pipe. , the water flow rate can be doubled.

The filtration period of the water filtration equipment of the invention is extended by about 75% compared with the existing filter tank with pure water flushing, the amount of intercepted sewage can be increased by 118%, and the consumption of backwash water can be reduced by more than 40% compared with the filter tank with pure water flushing , When the filter tank is flushed with air, the air is pressed into the filter layer 4 by the blower (connected to the air washing pipe 29), so the filtering performance of the filter tank is improved from the following aspects:

①The addition of compressed air increases the shear force on the surface of the filter material in the filter layer, so that the dirt that is not easy to peel off during normal water washing can be peeled off under the high shear force of the sharp rise of air bubbles, thereby improving the backwash effect.

②After the bubbles move in the filter layer to generate mixing, the particles of the filter material can be continuously vortexed and diffused, which promotes the cyclic mixing of the filter layer particles, thereby obtaining a mixed filter layer with a relatively uniform gradation, and its porosity is higher than that of the gradation. The grading filter layer of the filter material improves the filtration performance, thereby improving the filter layer's ability to intercept dirt.

③ With the addition of compressed air, the air bubbles explode in the granular filter material, which intensifies the collision and friction between the filter material particles. During water washing, the shearing effect on the surface of the filter material particles can also be fully exerted, which strengthens the cleaning effect of water washing. efficacy.

④ The movement of air bubbles in the filter layer reduces the resistance of the mutual contact between the filter particles during water flushing, so that the water flushing intensity is greatly reduced, thereby saving the energy consumption of flushing.

To sum up, during backwashing with air and water, due to the intense trent action of air bubbles, the ability of dirt peeling and interception is greatly enhanced; during the actual backwashing of this equipment, we observed: when the backwashing time is about 5 The filter layer dirt peels off more than 95% in minutes, so the backwash effect of this equipment is certain.

If words such as "first" and "second" are used herein to define components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing components The above terms have no special meaning unless otherwise stated.

At the same time, if the above-mentioned invention discloses or involves parts or structural parts that are fixedly connected to each other, then, unless otherwise stated, fixed connection can be understood as: detachable fixed connection (for example, using bolts or screws), or It is understood as: non-removable fixed connection (such as riveting, welding), of course, the mutual fixed connection can also be replaced by a one-piece structure (for example, integrally formed using a casting process) (except that it is obviously impossible to use the one-piece forming process).

In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in the present disclosure used to represent positional relationships or shapes include states or shapes that are similar to, similar to, or close to.

Any component provided by the present invention may be assembled from a plurality of individual components, or may be a single component manufactured by an integral molding process.

Finally it should be noted that: the above embodiment is only used to illustrate the technical scheme of the present invention and not to limit it; Although the present invention has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should understand: The specific embodiments of the invention are modified or some technical features are equivalently replaced; without departing from the spirit of the technical solutions of the present invention, all of them should be included in the scope of the technical solutions claimed in the present invention.

Claims

A water filtration device is characterized in that: it comprises a cylindrical tank with a sewage water inlet on the upper part, a gas-water backwash chamber arranged in the bottom of the cylindrical tank, and a water-air backwash chamber provided in the cylindrical tank and located above the gas-water backwash chamber. The filter layer, the air and water recoil chamber is provided with an air and water recoil mechanism, and the air and water recoil mechanism includes a lower center pipe with an air wash port and a water wash port on the pipe wall, and a lower center pipe with an air wash port and a water wash port on the pipe wall. The backwash air inlet pipe and the backwash water inlet pipe are connected by pipes. The backwash air inlet pipe is provided with a plurality of air ports along its length direction, and the backwash water inlet pipe is provided with a plurality of drain ports along its length direction. An upper center pipe with a closed bottom is arranged above the gas-water recoil chamber, a sewage overflow inlet is arranged on the upper center pipe, and a sewage pipeline extending out of the gas-water recoil chamber is arranged on the lower side of the upper center pipe.
The water filtration equipment according to claim 1, characterized in that: the cylindrical tank is a cylindrical stainless steel tank body, and a circle of cofferdam plates is arranged on the inner wall surface of the cylindrical tank and on the side of the sewage water inlet, The cofferdam plate forms an annular groove with the inner wall surface of the cylindrical tank, and the upper edge of the cofferdam plate has saw teeth.
The water filtering device according to claim 1, wherein a plurality of support rods are arranged between the inner wall surface of the cylindrical tank and the upper central pipe.
The water filtration device according to claim 1, wherein the filter layer is located between the inner wall surface of the cylindrical tank and the upper central pipe, and the filter layer comprises a fine quartz sand filter material layer and a coarse quartz sand filter layer. material layer.
The water filtration equipment according to claim 1, wherein the plate surface of the gas-water backflushing chamber in contact with the filter layer has filter holes or a long-handled filter cap.
The water filtration device according to claim 1, wherein the upper port of the upper central pipe is higher than the upper surface of the filter layer.
The water filtration device according to claim 1, wherein the backflushing intake pipe comprises an intake annular pipe and a plurality of backflushing intake branch pipes for connecting the lower central pipe and the intake annular pipe, and the backflushing intake pipe The flushing water inlet pipe includes a water inlet annular pipe and a plurality of backwashing water inlet branch pipes for connecting the water inlet annular pipe and the lower central pipe.
The water filtration device according to claim 1, characterized in that: the side of the lower central pipe is provided with a water washing pipe extending out of the gas-water backwash chamber, and the end of the water washing pipe is communicated with the water washing port; the lower central pipe The side part is provided with an air wash pipe extending out of the air-water backwash chamber, the air wash pipe is communicated with the air wash port, and the air wash port is located above the water wash port of the water inlet pipe.
A working method of water filtration equipment, characterized in that: the water filtration equipment comprises a cylindrical tank with a sewage water inlet on the upper part, a gas-water backflushing chamber arranged in the bottom of the cylindrical tank, and a backwash chamber provided in the cylindrical tank and The filter layer is located above the gas-water recoil chamber. The gas-water recoil chamber is provided with an air and water recoil mechanism. The air and water recoil mechanism includes a lower central pipe with an air wash port and a water wash port on the pipe wall. , The periphery is provided with a backwash air inlet pipe and a backwash water inlet pipe which are respectively communicated with the lower central pipe. The backwash air inlet pipe is provided with a plurality of air ports along its length direction, and the backwash water inlet pipe is provided with a plurality of drains along its length direction. Inside the cylindrical tank and above the gas-water recoil chamber, there is an upper center pipe with a closed bottom surface, the upper center pipe is provided with a sewage overflow inlet, and the lower side of the upper center pipe is provided with a gas-water recoil chamber extending out When the filtration works, the sewage enters the cylindrical tank from the sewage inlet, and the filtered water is filtered layer by layer and then enters the gas-water backwash chamber, the backwash water inlet pipe and the lower center pipe, and finally filtered. The latter water is discharged from the water washing pipe on the lower center pipe.
The working method of water filtration equipment according to claim 9, wherein when the filter structure works for a period of time, when the dirt in the filter layer reaches a considerable amount, the filtration resistance of the filter layer increases, resulting in a decrease in the amount of filtration. , at this time, the filter layer needs to be backwashed to discharge the dirt in the filter layer and restore the filtration capacity of the filter layer; when backwashing, first only use high-pressure air to disperse the dirt, and then high-pressure water Flushing and high-pressure air flushing are carried out together, and finally, only high-pressure water flushing is carried out; when only high-pressure gas is used to disperse the dirt, the inflatable equipment is used to blow air into the interior through the air-washing pipe, and the gas is sequentially backwashed from the inside of the lower center pipe. Air intake pipe, air port, air-water backwash chamber and long-handled filter cap, the gas passes through the filter layer and disperses the impurities filtered and deposited on the filter layer; when high-pressure water is flushed, the high-pressure flushing water is fed into the water-washing pipe, and the water flows from the bottom The inside of the central pipe enters the filter layer through the backwash water inlet pipe, the drain outlet, the gas-water backwash chamber and the long-handled filter cap in turn. The water flows through the filter layer to wash the impurities filtered and deposited on the filter layer. Residual impurities are flushed to the sewage overflow inlet at the upper end of the upper center pipe, and finally discharged from the sewage pipe; when high-pressure water flushing and high-pressure air flushing are carried out together, the above two methods are carried out simultaneously, that is, the water for high-pressure flushing is passed into the water washing pipe. And the high pressure gas is introduced into the gas washing pipe.