CN111236363A - Secondary water supply tank with full-quantity filtering and self-cleaning functions and method - Google Patents

Abstract

The invention discloses a secondary water supply tank with full filtration and self-cleaning functions and a method, wherein the tank comprises a tank body and is characterized in that: this internal vertical baffle that is provided with of water tank, form overflow channel between the roof of baffle top and water tank body, first water tank and second water tank are separated into by preceding to the back to the water tank body to the baffle, first water tank and municipal water piping connection, the municipal water piping is provided with the water intaking valve on the road, be provided with filter equipment in the first water tank, bottom play water after filter equipment's side intaking, filter equipment passes through bottom connecting tube and second water tank intercommunication, the bottom of first water tank is equipped with sewage pipes, be provided with the liquid level detection mechanism who is used for controlling the switching of first water tank water intaking valve in the second water tank, the advantage is: make municipal tap water earlier through preliminary sediment, then carry out the total filtration, get rid of the secondary pollutant that supplies water to can guarantee the normal water supply of resident family simultaneously at the self-cleaning to filter equipment automatic washing.

Description

Secondary water supply tank with full-quantity filtering and self-cleaning functions and method

Technical Field

The invention relates to the field of urban and rural secondary water supply, in particular to a secondary water supply tank with full-quantity filtering and self-cleaning functions and a method.

Background

The safety guarantee of drinking water is closely related to the life health of people and the sustainable development of economic society, and is an important mark of the development level of modern cities and the quality of life of urban and rural residents. Tap water treated by a water plant is conveyed to each household through a huge municipal pipeline system for secondary water supply, and nowadays more and more communities are provided with water tanks underground for storing tap water and then conveyed to households through a pressurizing pump. Generally, tap water treated by a water plant can meet the national drinking water sanitation standard, but a huge underground pipe network system is like a large-scale reactor, and a lot of water quality problems mainly occur in the intermediate links between the water plant and the water faucet of each household. On one hand, the problems of aging corrosion of pipeline materials of the underground pipe network system, leakage of joint points of water pipes, falling of coatings on the inner walls of metal pipelines and the like are brought about by substances which are main sources of 'secondary pollution', wherein municipal pipe network secondary pollutants mainly comprise metal corrosion products, soluble organic matters, mud and sand suspended matters mixed into the pipe network and the like. On the other hand, when water supply equipment such as a water tank and a water pump is used for secondary water supply, the problem of pollution is easily caused due to poor management or untimely maintenance, and the safety of domestic water is affected.

And the pollution problem of the secondary water supply system has universality, multiplicity and uncertainty. Because the central urban area scope is continuously enlarged, the work load of old pipe transformation is big, the construction degree of difficulty is high, operations such as cutting off the water supply and takeover are big to the water supply system disturbance, consequently can't thoroughly clear up the underground water supply pipe network for the "secondary pollution" problem of running water in the transportation process does not fundamentally obtain solving, still has the gap between city running water quality of residence and people's life demand.

In addition, when the water tank for storing water is regularly maintained and cleaned, some problems also exist: on one hand, the cleaning work of the existing water tank is basically finished manually, the operation space is narrow, and the cleaning task is heavy; on the other hand, the disturbance on the secondary water supply system during cleaning is increased, which causes water quality pollution in a staged or sudden manner, and seriously affects the water supply quality of regional users.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a secondary water supply tank with full filtration and self-cleaning functions and a method thereof, which can perform full filtration and precipitation on secondary water supply, remove secondary pollutants, automatically clean a filter device and do not influence normal secondary water supply of residents while self-cleaning.

The technical scheme adopted by the invention for solving the technical problems is as follows: a secondary water supply tank with full filtration and self-cleaning functions comprises a tank body, wherein a baffle is vertically arranged in the tank body, an overflow channel is formed between the top end of the baffle and the top wall of the tank body at intervals, the baffle divides the tank body into a first tank and a second tank from front to back, the first tank is connected with a municipal water pipeline, a water inlet valve is arranged at one end of the municipal water pipeline entering the first tank, a filter device is arranged in the first tank, a filtration water inlet communicated with the outside is arranged at least one side of the filter device, a filtration water outlet is arranged at the bottom of the filter device, the filtration water outlet is communicated with the second tank through a connecting pipeline, a first valve is arranged on the connecting pipeline, and a sewage discharge pipeline is arranged at the bottom end of the first tank, the sewage draining pipeline is provided with a second valve, the second water tank is internally provided with a liquid level detection mechanism which is connected with the water inlet valve and used for switching the opening and closing state of the water inlet valve, and the rear side of the second water tank is connected with a secondary water supply pipeline.

In some embodiments, the side wall of the filtering device is surrounded by a stainless steel metal filter screen, the meshes of the stainless steel metal filter screen form the filtering water inlet, the top end and the bottom end of the filtering device are hermetically arranged, the filtering water inlet is arranged at the bottom end of the filtering device, and a plurality of filtering medium units are arranged in the filtering device. From this municipal water from stainless steel metal filter screen entering filter equipment in, flow out from the bottom and get into the second water tank after inside filter medium unit purifies, municipal water can deposit and filter in step in first water tank.

In some embodiments, the stainless steel metal screen has a precision in the range of 0.1 to 100 microns, and the filter media units are filled with one or a combination of the following filter materials: quartz sand, granular activated carbon, medical stone, ceramsite and fiber balls. Therefore, the filter medium has a better filtering effect, can remove most of secondary pollutants along the filtering path to obtain better water quality, and is not limited to the filter medium and the setting method, so long as the filter medium can be used for filtering the secondary pollutants.

In some embodiments, an ultrasonic vibration plate is disposed in the first water tank, and the ultrasonic vibration plate is disposed in parallel on both sides or the periphery of the filter device. Therefore, during backwashing, the cleaning effect on the filter medium and the peripheral water inlet channels can be enhanced through ultrasonic oscillation, and impurities enter the first water tank from the filter device in a reverse direction outwards under the action of water flow and impact force and are discharged by the sewage discharge channel.

In some embodiments, the first water tank is filled with a fiber ball filter material, and the fiber ball filter material is arranged on the periphery of the filter device. Therefore, the washing effect is further enhanced by utilizing the water flow effect in the back washing stage and rolling the fiber balls, the fiber balls also have a certain function of absorbing iron, and the dirt receiving capacity of the secondary water supply tank is improved.

In some embodiments, at least two filtering devices are provided, and the filtering devices are arranged side by side in the vertical direction.

In some embodiments, the top end of the baffle is provided with an overflow weir, the upper end of the overflow weir is provided with a plurality of downward-concave overflow chutes, and the cross section of each overflow chute is triangular, circular arc, rectangular or inverted trapezoid. Thereby further serving to keep the water flow stable.

In some embodiments, the liquid level detection mechanism includes a floating ball disposed in the second tank, the floating ball is connected to the inlet valve through a connecting rod, the connecting rod spans above the baffle, a set water level is disposed in the second tank, and the floating ball controls the inlet valve to open when the water level in the second tank is lower than the set water level; when the water level in the second water tank is higher than or equal to the set water level, the floating ball controls the water inlet valve to be closed, so that the liquid level of the first water tank is always higher than the liquid level of the second water tank.

In some embodiments, the volume ratio of the first water tank to the second water tank ranges from: 1: 9-1: 1. The volume of two water tanks is the specific selection, combines above-mentioned other structures to constitute this scheme jointly, realizes deposiing the dynamic balance who filters and supply water, has better effect.

A secondary water supply method adopting the secondary water supply tank comprises the following steps:

and (3) filtering state: municipal water enters a first water tank, is subjected to preliminary sedimentation and then enters a filtering device for filtering, a first valve is opened, filtered purified water enters a second water tank through a connecting pipeline, a secondary water supply pipeline is opened to supply water to each resident, a water inlet valve of the first water tank is controlled by a liquid level detection mechanism and is used for controlling the amount of inlet water, the liquid level of the second water tank is kept constant, and the liquid level of the first water tank is always higher than that of the second water tank;

and (3) overflow state: when the filtering device is blocked, the liquid level of the first water tank rapidly rises until the water in the first water tank overflows into the second water tank through the overflow channel, so that the normal supply of water for residents is ensured;

back washing state: after the overflow state occurs, when the liquid level of the second water tank is restored to the set water level, the liquid level detection mechanism controls to close the water inlet valve, close the first valve, open the second valve on the sewage discharge pipeline, so that the liquid level of the second water tank is higher than that of the first water tank, open the first valve, and the water in the second water tank enters the filtering device from the reverse direction of the connecting pipeline under the action of the water pressure difference to clean the filtering device, and the cleaning sewage is discharged from the sewage discharge port; and starting the ultrasonic vibration plates arranged on the two sides or the periphery of the filtering device, and intensively cleaning the filtering device together with the backflushing water flow.

Compared with the prior art, the invention has the advantages that:

(1) the municipal water supply is subjected to precipitation and full filtration synchronously in the first water tank to remove secondary pollutants, and tap water purified by the first water tank is stored in the second water tank and supplied to residents;

(2) when the liquid level of the first water tank rises rapidly due to blockage of the filtering device, water in the first water tank overflows to the second water tank through the top overflow channel, a liquid level detection mechanism for controlling the opening and closing of a water inlet valve of the first water tank is arranged in the second water tank, and the water inlet of the first water tank can be controlled through the liquid level in the second water tank, so that the liquid level of the first water tank is higher than that of the second water tank, and the filtering process and the filtering effect are ensured;

(3) when the filtering device is blocked, the liquid level detection mechanism can control the water inlet valve to be closed and the drain valve to be opened, so that the filtering device is automatically backwashed by utilizing the water level pressure difference between the first water tank and the second water tank, and the cleaning effect is further enhanced by arranging the ultrasonic vibration plate on the side surface of the filtering device;

(4) the normal secondary water supply of the residents cannot be influenced no matter in the filtering stage, the overflowing stage or the backwashing stage, so that convenience is provided for the residents;

(5) the water tank cleaning machine solves the problems that an existing water tank is narrow in cleaning space and heavy in task depending on manual cleaning, can timely and conveniently self-clean a filtering device and the water tank, can further improve the self-cleaning effect by adding the ultrasonic vibration plate, and cannot cause disturbance of a secondary water supply system during cleaning.

Drawings

FIG. 1 is a schematic structural view of an embodiment of a secondary water supply tank having full filtration and self-cleaning functions according to the present invention;

FIG. 2 is a schematic view showing a filtering state of an embodiment of a secondary water supply tank having full filtering and self-cleaning functions according to the present invention;

FIG. 3 is a schematic view showing an overflow state of an embodiment of a secondary water supply tank having full-scale filtering and self-cleaning functions according to the present invention;

FIG. 4 is a schematic view showing a back-flushing state of an embodiment of a secondary water supply tank having full-scale filtering and self-cleaning functions according to the present invention;

FIG. 5 is a top view of an embodiment of a secondary water supply tank with full filtration and self-cleaning features of the present invention;

FIG. 6 is a schematic diagram of a filter apparatus according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a backwash of a filtration device according to an embodiment of the present invention.

The water tank comprises a water tank body 1, a baffle 2, an overflow channel 3, a first water tank 4, a second water tank 5, a municipal water pipeline 6, a water inlet valve 7, a filtering device 8, a connecting pipeline 9, a first valve 10, a sewage discharge pipeline 11, a second valve 12, a secondary water supply pipeline 13, a stainless steel metal filter screen 14, a filtered water outlet 15, a filtering medium unit 16, an ultrasonic vibration plate 17, a floating ball 18, a connecting rod 19, a water flowmeter 20, a third valve 21, a filter 22, a fourth valve 23, a water supply pump 24, a water quality sensor 25 and a control system 26.

Detailed Description

The following provides a further detailed description of the secondary water supply tank with full filtering and self-cleaning functions and the method thereof with reference to the accompanying drawings and embodiments, but the invention is not limited thereto.

Example one

As shown in the figure, the secondary water supply tank with the full-scale filtering and self-cleaning functions comprises a tank body 1, a baffle 2 is vertically arranged in the tank body 1, an overflow channel 3 is formed between the top end of the baffle 2 and the top wall of the tank body 1 at intervals, the baffle 2 divides the tank body 1 into a first tank 4 and a second tank 5 from front to back, the first tank 4 is connected with a municipal water pipeline 6, one end of the municipal water pipeline 6, which enters the first tank 4, is provided with a water inlet valve 7, a filtering device 8 is arranged in the first tank 4, at least one side of the filtering device 8 is provided with a filtering water inlet communicated with the outside, the bottom of the filtering device 8 is provided with a filtering water outlet, the filtering water outlet is communicated with the second tank 5 through a connecting pipeline 9, the connecting pipeline 9 is provided with a first valve 10, the bottom end of the first tank 4 is, the sewage discharge pipeline 11 is provided with a second valve 12, the second water tank 5 is internally provided with a liquid level detection mechanism which is connected with the water inlet valve 7 and used for switching the open-close state of the water inlet valve 7, and the rear side of the second water tank 5 is connected with a secondary water supply pipeline 13.

In this embodiment, the filtering water outlet at the bottom of the filtering device 8 is communicated with the second water tank 5 through a connecting pipeline 9, the connecting pipeline extends out of the water tank body 1, and a first valve 10 on the connecting pipeline 9 for controlling the opening and closing of the pipeline is also arranged outside the water tank body 1.

In this embodiment, one filtering device 8 is provided, and in other embodiments, different numbers of filtering devices 8 may be provided according to the actual water consumption of the resident, and when two or more filtering devices 8 are provided, the filtering devices 8 are arranged side by side in the vertical direction.

Example two

The present embodiment provides a secondary water supply tank with full filtering and self-cleaning functions, which further defines the structure of the filtering device 8 on the basis of the first embodiment. In this embodiment, the lateral wall of filter equipment 8 is enclosed by stainless steel metal filter screen 14, and stainless steel metal filter screen 14's mesh constitutes and filters the water inlet, and filter equipment 8's top and bottom are sealed setting, filter delivery port 15 and set up in filter equipment 8's bottom, are provided with a plurality of filter medium unit 16 in the filter equipment 8.

In this embodiment, the fineness of the stainless steel metal screen 14 is 100 micrometers, and in other embodiments, the screen accuracy may also be in the range of 0.1, 10, 50 micrometers, and so on. The filter media units 16 are filled with the following filter materials, either alone or in combination: quartz sand, granular activated carbon, medical stone, ceramsite, fiber balls, and any filtering material capable of purifying water quality for secondary water supply can be adopted. In other embodiments, a deep purification unit such as PP cotton, a pleated filter element, or an ultrafiltration membrane can be connected in series in the filter device 8.

EXAMPLE III

The present embodiment provides a secondary water supply tank with full filtering and self-cleaning functions, which is a further improvement of the structure in the first water tank 4 on the basis of the first embodiment. In this embodiment, the ultrasonic vibration plates 17 are provided in the first water tank 4, and the ultrasonic vibration plates 17 are provided in parallel on both sides or the outer periphery of the filter device 8. The ultrasonic plate vibration plates on two sides or periphery of the filtering device are opened during cleaning, so that the cleaning effect of the filtering device can be further enhanced under the influence of water flow.

In this embodiment, the first water tank 4 is filled with a fiber ball filter material, and the fiber ball filter material is disposed on the periphery of the filter device. Therefore, the washing effect is further enhanced by utilizing the water flow effect in the back washing stage and rolling the fiber balls, the fiber balls also have a certain function of absorbing iron, and the dirt receiving capacity of the secondary water supply tank is improved.

Example four

The present embodiment provides a secondary water supply tank with full filtering and self-cleaning functions, which further improves the structure of the overflow channel 3 on the basis of the first embodiment. In this embodiment, the top end of the baffle 2 is provided with an overflow weir, the upper end of the overflow weir is provided with a plurality of downward-concave overflow chutes, and the cross sections of the overflow chutes are rectangular or inverted trapezoidal.

EXAMPLE five

The secondary water supply tank with the full-quantity filtering and self-cleaning functions provided by the embodiment further defines the structure of the liquid level detection mechanism on the basis of the first embodiment. In this embodiment, the liquid level detection mechanism includes a floating ball 18 disposed in the second water tank 5, the floating ball 18 is connected to the water inlet valve 7 through a connecting rod 19, the connecting rod 19 is disposed above the baffle 2 in a straddling manner, or a fulcrum of the connecting rod 19 is disposed above the overflow channel 3, a set water level is disposed in the second water tank 5, and when the water level in the second water tank 5 is lower than the set water level, the floating ball 18 controls the water inlet valve 7 to open; when the water level in the second water tank 5 is higher than or equal to the set water level, the floating ball 18 controls the water inlet valve 7 to be closed, so that the liquid level of the first water tank 4 is always higher than the liquid level of the second water tank 5, a water head difference is formed, and the filtering process and the filtering effect are ensured.

In this embodiment, the volume ratio of the first water tank 4 to the second water tank 5 is 1:5, and in other embodiments, the volume ratio of the first water tank 4 to the second water tank 5 may be 1:9, 1:3, 1:1, and the like. The volume of the second water tank is not smaller than that of the first water tank, so that the processes of filtering, water supply, overflowing and backwashing of the water tanks can be guaranteed.

EXAMPLE six

The present embodiment provides a secondary water supply tank with full filtering and self-cleaning functions, which is further defined by the rest of the structure of the tank on the basis of any one of the above embodiments. In this embodiment, a water flow meter 20, a third valve 21 and a filter 22 are sequentially arranged on the municipal water pipeline 6 from front to back, and the water flow meter, the third valve and the filter are all arranged outside the water tank body. And a fourth valve 23 and at least one water supply pump 24 for controlling the opening and closing of the secondary water supply pipeline are sequentially arranged on the secondary water supply pipeline 13 from front to back, and the water supply pump is used for providing secondary water supply pressure for residents. A water quality sensor 25 is arranged at an inlet of the second water tank 5 close to the secondary water supply pipeline 13 and used for backwashing the filtering device 8 when detecting that the water quality in the secondary water tank is poor.

In this embodiment, the water flow meter 20, the third valve 21, the ultrasonic plate vibrating plate 17, the water inlet valve 7, the liquid level sensor (the floating ball 18), the water quality sensor 25, the water supply pump 24, the fourth valve 23, the first valve 10, and the second valve 12 are electrically connected to the external control system 26, and the control method is conventional in the art and will not be described again. In other embodiments, each valve can adopt other alternative structures such as a manual valve.

EXAMPLE seven

A water supply method of the present embodiment using the secondary water supply tank of any of the above embodiments includes the steps of (arrows indicate water flow directions):

and (3) filtering state: municipal water enters a first water tank, is subjected to preliminary sedimentation and then enters a filtering device for filtering, a first valve is opened, filtered purified water enters a second water tank through a connecting pipeline, a secondary water supply pipeline at the tail end of the second water tank is opened to supply water to each resident, and a liquid level detection mechanism controls a water inlet valve of the first water tank and is used for controlling the amount of the inlet water, keeping the liquid level of the second water tank constant and enabling the liquid level of the first water tank to be higher than that of the second water tank all the time; under the condition of normal filtration flux and opening a secondary water supply pipeline to supply water to residents, the liquid level of the first water tank is higher than that of the second water tank, the liquid level of the second water tank is lower than a set water level, and the liquid level detection mechanism controls the water inlet valve to be opened to perform stable filtration and water supply operation.

And (3) overflow state: when the filtering device is blocked, the liquid level of the first water tank rapidly rises until the water in the first water tank overflows into the second water tank through the overflow channel, so that the normal supply of water for residents is ensured;

back washing state: after the overflow state takes place, when the liquid level of waiting the second water tank resumes to setting for the water level, liquid level detection mechanism control closed water inlet valve, closed first valve, open the second valve on the sewage pipes, make the liquid level of second water tank be higher than the liquid level of first water tank, open first valve again, water in the second water tank gets into filter equipment from the connecting line opposite direction under the differential pressure effect, washs filter equipment, washs sewage from the drain discharge.

In this embodiment, the ultrasonic vibration plates disposed on both sides or the periphery of the filter device are activated to intensively clean the filter device together with the backflushing water flow.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, and the present invention may be modified in materials and structures, or replaced with technical equivalents, in the constructions of the above-mentioned various components. Therefore, structural equivalents made by using the description and drawings of the present invention or by directly or indirectly applying to other related arts are also encompassed within the scope of the present invention.

Claims (10)

1. A secondary water supply tank with full filtration and self-cleaning functions comprises a tank body and is characterized in that a baffle is vertically arranged in the tank body, an overflow channel is formed between the top end of the baffle and the top wall of the tank body at intervals, the baffle divides the tank body into a first tank and a second tank from front to back, the first tank is connected with a municipal water pipeline, one end of the municipal water pipeline, entering the first tank, is provided with a water inlet valve, the first tank is internally provided with a filter device, at least one side of the filter device is provided with a filtration water inlet communicated with the outside, the bottom of the filter device is provided with a filtration water outlet communicated with the second tank through a connecting pipeline, and the connecting pipeline is provided with a first valve, the bottom of first water tank be provided with the blowdown pipeline, the blowdown pipeline on be provided with the second valve, the second water tank in be provided with the water intaking valve be connected and be used for switching the liquid level detection mechanism of water intaking valve open-close state, the rear side and the secondary water supply pipeline of second water tank be connected.

2. The secondary water supply tank with the functions of full-scale filtration and self-cleaning according to claim 1, characterized in that the side wall of the filtering device is surrounded by stainless steel metal filter screens, the meshes of the stainless steel metal filter screens form the filtering water inlet, the top end and the bottom end of the filtering device are sealed, the filtering water outlet is arranged at the bottom end of the filtering device, and a plurality of filtering medium units are arranged in the filtering device.

3. The secondary water supply tank with full-scale filtering and self-cleaning functions as claimed in claim 2, wherein the precision of the stainless steel metal screen is in the range of 0.1-100 μm, and the filtering medium unit is filled with the following filtering materials, either alone or in combination: quartz sand, granular activated carbon, medical stone, ceramsite and fiber balls.

4. The secondary water supply tank with full filtration and self-cleaning functions as claimed in claim 1, wherein ultrasonic vibration plates are provided in the first water tank, and the ultrasonic vibration plates are provided in parallel on both sides or the outer circumference of the filtration device.

5. The secondary water supply tank with the functions of full-scale filtration and self-cleaning as claimed in claim 1, wherein the first tank is filled with a fiber ball filter material, and the fiber ball filter material is arranged at the periphery of the filter device.

6. The secondary water supply tank having full filtering and self-cleaning functions as claimed in claim 1, wherein the filtering means is provided in at least two, and the filtering means are arranged side by side in a vertical direction.

7. The secondary water supply tank with full filtration and self-cleaning functions as claimed in claim 1, wherein the top end of the baffle is provided with an overflow weir, the upper end of the overflow weir is provided with a plurality of concave overflow chutes, and the cross section of each overflow chute is triangular, circular arc, rectangular or inverted trapezoid.

8. The secondary water supply tank of claim 1, wherein the liquid level detection mechanism comprises a float disposed in the secondary tank, the float is connected to the inlet valve through a connecting rod, the connecting rod spans above the baffle, a set water level is disposed in the secondary tank, and the float controls the inlet valve to open when the water level in the secondary tank is lower than the set water level; when the water level in the second water tank is higher than or equal to the set water level, the floating ball controls the water inlet valve to be closed, so that the liquid level of the first water tank is always higher than the liquid level of the second water tank.

9. The secondary water supply tank with full filtering and self-cleaning functions as claimed in claim 1, wherein the volume ratio of the first tank to the second tank is in the range of: 1: 9-1: 1.

10. A secondary water supply method using the secondary water supply tank as claimed in any one of claims 1 to 9, characterized by comprising the steps of:

and (3) filtering state: municipal water enters a first water tank, is subjected to preliminary sedimentation and then enters a filtering device for filtering, a first valve is opened, filtered purified water enters a second water tank through a connecting pipeline, a secondary water supply pipeline is opened to supply water to each resident, a water inlet valve of the first water tank is controlled by a liquid level detection mechanism and is used for controlling the amount of inlet water, the liquid level of the second water tank is kept constant, and the liquid level of the first water tank is always higher than that of the second water tank;

and (3) overflow state: when the filtering device is blocked, the liquid level of the first water tank rapidly rises until the water in the first water tank overflows into the second water tank through the overflow channel, so that the normal supply of water for residents is ensured;

back washing state: after the overflow state occurs, when the liquid level of the second water tank is restored to the set water level, the liquid level detection mechanism controls to close the water inlet valve, close the first valve, open the second valve on the sewage discharge pipeline, so that the liquid level of the second water tank is higher than that of the first water tank, open the first valve, and the water in the second water tank enters the filtering device from the reverse direction of the connecting pipeline under the action of the water pressure difference to clean the filtering device, and the cleaning sewage is discharged from the sewage discharge port; and starting the ultrasonic vibration plates arranged on the two sides or the periphery of the filtering device, and intensively cleaning the filtering device together with the backflushing water flow.

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