Ultrasonic-assisted automatic backwashing filtering device

Abstract

The invention discloses an ultrasonic-assisted automatic backwashing filter device which comprises two filter cartridges, a water outlet pipe, a water inlet pipe, a drain pipe, a bypass pipeline and valve groups arranged on the pipelines, the water outlet pipe is mounted at the top ends of the two filter cartridges, and the water inlet pipe is mounted at the positions, close to the bottom ends, of the two filter cartridges; the drain pipe is mounted on the bottom surfaces of the two filter cartridges, the bypass pipeline is mounted between the tail end of the water outlet pipe and the tail end of the water inlet pipe, and filter structures are arranged in the filter cartridges; when one filter cartridge is allowed to be backwashed, the other filter cartridge is allowed to continue filtering, the continuity of the production process is ensured, primary liquid backwashing is firstly carried out, and impurities on the surface of the filter tube are taken away by utilizing the liquidity of liquid; then back flushing is carried out, and impurities embedded in pores of the filter tube are stripped by using the high-pressure characteristic of compressed air; and finally, secondary liquid backwashing is carried out, and impurities which are reversely blown out are flushed to a water outlet, so that the backwashing capability can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of purification and filtration, and in particular to an ultrasonic-assisted automatic backwashing filtration device. Background Art

[0002] In the related art, a filter is a device or mechanism whose main function is to separate unwanted solid particles, liquid droplets, gas bubbles or other impurities from a substance. Filters are widely used in various industries and daily life fields.

[0003] The filter will capture and accumulate impurities during operation, which will gradually clog the filter medium and cause the filter efficiency to decrease. Regular cleaning can remove these impurities and maintain the filter efficiency.

[0004] However, when the filter is being cleaned, filtering work cannot be performed at the same time, the continuity of the filtering process and the real-time filtration of the entire amount of the tank liquid cannot be guaranteed, and the cleaning efficiency of the existing automatic filter cleaning also needs to be improved. Summary of the invention

[0005] In order to solve the above problem, the present invention provides an ultrasonic assisted automatic backwashing filter device to solve the problem.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] An ultrasonic-assisted automatic backwashing filter device comprises two filter cartridges, an outlet pipe, an inlet pipe, a drain pipe, a bypass pipeline and a valve group arranged on each pipeline, wherein the outlet pipe is installed at the top of the two filter cartridges, the inlet pipe is installed at a position close to the bottom of the two filter cartridges, the drain pipe is installed on the bottom surface of the two filter cartridges, the bypass pipeline is installed between the end of the outlet pipe and the end of the inlet pipe, and a filtering structure is arranged in the filter cartridge.

[0008] It is further configured as follows: the filter cartridge is composed of a head and a cartridge body, and the head and the cartridge body are connected via a flange.

[0009] It is further configured as follows: the filtering structure includes a partition plate, a filtering assembly, an ultrasonic vibration plate and an ultrasonic generator, the partition plate is installed in the cylinder, the filtering assembly includes filter tubes distributed in a vertical array, and the upper parts of the multiple filter tubes are provided with external threads, and threaded holes compatible with the external threads are provided on the partition plate, and the multiple filter tubes are threadedly connected to the partition plate, and the top ends of the filter tubes pass through the partition plate, the ultrasonic vibration plate is a closed box body, and a plurality of ultrasonic generators are arranged inside it, and an ultrasonic generator circuit is provided outside the cylinder.

[0010] It is further configured as follows: the bottom surfaces of the two filter cartridges are each provided with a concave surface with the middle part sunken downward, a water inlet is opened at a position close to the bottom of the circumferential surface of the two filter cartridges, a water outlet is opened at the top of the two heads, and a drainage outlet is opened at the lowest end of the bottom surface of the two filter cartridges.

[0011] It is further configured as follows: a water outlet pipe is installed at two water outlets, a water inlet pipe is installed at two water inlets, a drain pipe is installed at two drain outlets, and the water outlet pipe, the water inlet pipe and the drain pipe are all configured as F-type, the two branch pipes of the water outlet pipe are respectively connected to the water outlets of the two filter cartridges, and the end of the main pipe of the water outlet pipe is connected to the outside; the two branch pipes of the water inlet pipe are respectively connected to the water inlets of the two filter cartridges, and the end of the main pipe of the water inlet pipe is connected to the outside; the two branch pipes of the drain pipe are respectively connected to the drain outlets of the two filter cartridges, and the end of the main pipe of the drain pipe is connected to the outside.

[0012] The valve group is further configured as follows: the valve group includes two automatic valves one respectively installed on the two branch pipes of the outlet pipe, two automatic valves two respectively installed on the two branch pipes of the inlet pipe, two automatic valves three respectively installed on the two branch pipes of the drain pipe, an automatic valve four installed on the bypass pipe, and a controller for controlling the opening and closing of the automatic valve one, the automatic valve two, the automatic valve three and the automatic valve four.

[0013] It is further configured as follows: installation openings are provided at the two end caps and at one side of the two water inlet pipes close to the water inlet, and differential pressure sensors are installed at the installation openings.

[0014] It is further configured as follows: air compression ports are provided at positions of the two cylinders near the top ends thereof, and air compression valves are installed at the two air compression ports.

[0015] It is further configured that: the backflushing step of the filter cartridge includes:

[0016] S100, calculate the momentary clogging index C of any filter cartridge (n) ;

[0017] S200, determine the clogging index C of any filter cartridge at any time (n) Is it greater than the set value? If it is greater than the set value, the filter cartridge enters the backwash cleaning state.

[0018] The congestion index C at the moment (n) Obtained by the following formula:

[0019]

[0020] In the formula, C (n) represents the congestion index at the desired time; w i represents the weight factor;

[0021] P1n Indicates the pressure at the water outlet of the filter cartridge at the desired time; P 2n represents the pressure at the water inlet of the filter cartridge at the desired time; T n Indicates the desired time; T n-1 represents the previous moment of the desired moment; f(x) represents the fluid property parameter;

[0022] Among them, the fluid property parameters

[0023] Where, d p represents the particle diameter; Δρ represents the difference between the isolation and fluid density; μ represents the ability of the filter element to capture particles, which is the inherent filtration efficiency of the filter element; V flu Indicates the flow rate of the fluid.

[0024] Compared with the prior art, the beneficial technical effects of the present invention are:

[0025] 1. The present invention allows one filter cartridge to continue filtering while the other filter cartridge is backwashing, thereby ensuring the continuity of the production process and reducing downtime caused by cleaning.

[0026] 2. Furthermore, the present invention first performs a liquid backwash, using the fluidity of the liquid to remove impurities on the surface of the filter tube; then backwashing is performed, using the high-pressure characteristics of compressed air to peel off the impurities embedded in the pores of the filter tube; finally, a secondary liquid backwash is performed to flush the backwashed impurities to the drain port, which can improve the backwashing capacity. In the primary backwash and the secondary backwash, the liquid backwash pressure is set to 3 bar, and the compressed air backwash pressure is set to 6 bar. Such a pressure setting helps to more effectively peel and remove impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 For along Figure 1 A front view of

[0030] Figure 3 It is a three-dimensional schematic diagram of a single filter cartridge in the present invention;

[0031] Figure 4 It is a side cross-sectional view of a single filter cartridge in the present invention;

[0032] Figure 5 This is a schematic diagram of a single filter cartridge after the head is hidden in the present invention;

[0033] Figure 6 is a top view of the filtering structure of the present invention;

[0034] Figure 7 It is a three-dimensional schematic diagram of the filtering structure in the present invention;

[0035] Figure 8 It is an enlarged schematic diagram of the front section of the filtering structure of the present invention;

[0036] Figure numerals: 1. water receiving tray; 2. filter cartridge; 3. water outlet pipe; 4. water inlet pipe; 5. drain pipe; 6. bypass pipe; 7. head; 8. cylinder; 9. partition plate; 10. ultrasonic vibration plate; 11. support plate; 12. filter tube; 13. nut; 14. water inlet; 15. water outlet; 16. drain outlet; 17. automatic valve one; 18. automatic valve two; 19. automatic valve three; 20. automatic valve four; 21. differential pressure sensor; 22. air compression valve. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Example

[0041] Reference Figure 1-Figure 8 , is an ultrasonic-assisted automatic backwashing filter device disclosed in the present invention, comprising a water receiving tray 1, two filter cartridges 2, a water outlet pipe 3, a water inlet pipe 4, a drain pipe 5, a bypass pipeline 6 and a valve group arranged on each pipeline;

[0042] Furthermore, a filtering structure is provided in the filter cartridge 2, and the filter cartridge 2 is provided in a cylindrical shape, and two filter cartridges 2 are installed on the water receiving tray 1 through a bracket;

[0043] Specifically, the filter cartridge 2 is composed of a head 7 and a cylinder 8, and the head 7 and the cylinder 8 are connected by a flange. The filtering structure includes a partition plate 9, a filtering assembly, an ultrasonic vibration plate 10 and an ultrasonic generator, wherein a horizontally arranged support plate 11 is installed on the inner wall of the cylinder 8, and the support plate 11 is located at a side position close to the top of the cylinder 8, the partition plate 9 is horizontally installed on the support plate 11 by bolts, and a sealing ring is used to seal the partition plate 9 and the support plate 11. The filtering assembly includes filter tubes 12 distributed in a vertical array, and the upper parts of the multiple filter tubes 12 are provided with external threads, and the partition plate 9 is provided with threaded holes adapted thereto, and the multiple filter tubes 12 are threadedly connected to the partition plate 9, the top of the filter tube 12 is the outlet end and passes through the partition plate 9, and the bottom end is the inlet end.

[0044] In this embodiment, the filter element of the filter tube 12 is made of metal sintering, ceramic sintering or the like, and its filtering accuracy is between 10um and 100um.

[0045] Furthermore, a nut 13 is threadedly connected to the top end of the filter tube 12 , and a sealing gasket is provided on the bottom surface of the nut 13 to be pressed against the partition plate 9 .

[0046] In this embodiment, the filter tube 12 is used to filter impurities, the liquid enters from the bottom and exits from the top, and the impurities are filtered outside the filter tube 12. The partition plate 9 divides the filter tube 2 into two parts, the upper part is the clear liquid after being filtered by the filter assembly, and the lower part is the turbid liquid.

[0047] The ultrasonic vibration plate 10 is a closed box body, inside which are a number of ultrasonic generators evenly arranged inside one side of the box body, and a flange is provided at the top of the ultrasonic vibration plate 10 for wire outlet;

[0048] In this embodiment, a plurality of ultrasonic vibration plates 10 are provided and are evenly installed under the partition plate 9 through flanges. An ultrasonic generator circuit is provided outside the cylinder 8. The function of the ultrasonic generator circuit is to convert electrical energy into a high-frequency AC signal that matches the ultrasonic generator.

[0049] In this embodiment, the bottom surfaces of the two filter cartridges 2 are both provided with a concave surface with the middle part sunken downward, a water inlet 14 is provided at a position near the bottom of the circumferential surface of the two filter cartridges 2, a water outlet 15 is provided at the top of the two heads 7, and a drain port 16 is provided at the lowest end of the bottom surface of the two filter cartridges 2;

[0050] The water outlet pipe 3 is installed at two water outlets 15, and the water outlet pipe 3 is set to be F-shaped. Specifically, the two branch pipes of the water outlet pipe 3 are respectively connected to the water outlets 15 of the two filter cartridges 2, and the end of the main pipe of the water outlet pipe 3 is connected to the outside;

[0051] The water inlet pipe 4 is installed at the two water inlets 14, and the water inlet pipe 4 is set to be F-shaped. Specifically, the two branch pipes of the water inlet pipe 4 are respectively connected to the water inlets 14 of the two filter cartridges 2, and the end of the main pipe of the water inlet pipe 4 is connected to the outside;

[0052] The drain pipe 5 is installed at the two drain ports 16, and the drain pipe 5 is set in an F shape. Specifically, the two branch pipes of the drain pipe 5 are respectively connected to the drain ports 16 of the two filter cartridges 2, and the end of the main pipe of the drain pipe 5 is connected to the outside;

[0053] The bypass pipe 6 is vertically installed at the ends of the water outlet pipe 3 and the water inlet pipe 4 .

[0054] In this embodiment, the valve group includes two automatic valves 17 respectively installed on the two branch pipes of the outlet pipe 3, two automatic valves 18 respectively installed on the two branch pipes of the inlet pipe 4, two automatic valves 19 respectively installed on the two branch pipes of the drain pipe 5, an automatic valve 4 20 installed on the bypass pipe 6, and a controller for controlling the opening and closing of the automatic valves 17, 18, 19 and 20.

[0055] Furthermore, installation openings are provided at the two sealing heads 7 and at one side of the two water inlet pipes 4 close to the water inlet 14, and differential pressure sensors 21 are installed at the installation openings.

[0056] Furthermore, air compression ports are provided at positions near the top ends of the two cylinders 8, and air compression valves 22 are installed at the two air compression ports.

[0057] When the whole device is not working, the automatic valve 4 20 is in the open state, the automatic valve 1 17, the automatic valve 2 18 and the automatic valve 3 19 are in the closed state, and the liquid passes through the bypass line 6;

[0058] When the overall device is working, the automatic valve 1 17 and the automatic valve 2 18 are in the open state, the automatic valve 3 19 and the automatic valve 4 20 are in the closed state, and the two filter cartridges 2 are all in the filtering state. At this time, the liquid flows in from the water inlet 14, passes through the automatic valve 2 18, enters the filter cartridge 2 from the bottom and exits from the top, and after passing through the automatic valve 1 17, flows out from the outlet pipe 3.

[0059] Furthermore, the differential pressure sensor 21 is used to monitor the differential pressure between the water inlet 14 and the water outlet 15 of the filter cartridge 2 in real time;

[0060] In this embodiment, the backflushing step of the filter cartridge 2 includes:

[0061] Calculate the momentary clogging index C of any filter cartridge (n) ;

[0062] When the controller determines that any filter cartridge has a clogging index C (n) When it is greater than the set value, the filter cartridge enters the backwash cleaning state.

[0063] Time Congestion Index

[0064] In the formula, C (n) represents the congestion index at the requested time;

[0065] w i represents the weight factor, which is the weight of the data at each time point n. The weight factor is used to adjust the importance of the nth time point relative to other time points at the calculation time of the congestion index, that is: w i It represents the weighting of the product of pressure difference and time in each time interval to reflect the contribution of this time point to the overall blockage trend;

[0066] P 1n Indicates the pressure at the water outlet of the filter cartridge at the desired time; P 2n represents the pressure at the water inlet of the filter cartridge at the desired time; T n Indicates the desired time; T n-1 represents the previous moment of the desired moment; f(x) represents the fluid property parameter;

[0067] Among them, the fluid property parameters

[0068] Where, d p represents the particle diameter; Δρ represents the difference between the isolation and fluid density; μ represents the ability of the filter element to capture particles, which is the inherent filtration efficiency of the filter element; V flu Indicates the flow rate of the fluid.

[0069] When the controller calculates that the blockage index at a certain moment is greater than the set value according to the above formula, the controller automatically controls the opening and closing of automatic valve 1 17 , automatic valve 2 18 , automatic valve 3 19 and automatic valve 4 20 .

[0070] Specifically, when the left filter cartridge 2 needs to be cleaned, the right automatic valve 17 and the right automatic valve 2 18 are opened, and the other valves are closed. At this time, the liquid flows in from the water inlet pipe 4, the right automatic valve 2 18, and passes through the plurality of filter tubes 12 in the right filter cartridge 2 from bottom to top, and finally flows out from the water outlet pipe 3 after passing through the right automatic valve 1 17.

[0071] At the same time, the ultrasonic generator inside the left filter cartridge 2 starts to work. Due to the cavitation effect generated by the ultrasonic wave, the impurities adhering to the filter tube 12 are peeled off and fall off to the bottom of the cylinder 8. When the ultrasonic generator stops working, the automatic valve 17 and the automatic valve 3 19 on the left are opened. At this time, the liquid flows into the left filter cartridge 2 through the automatic valve 17 on the left, passes through the multiple filter tubes 12 inside the left filter cartridge 2 from top to bottom, and the liquid backwashes the filter tube 12, flushes the impurities to the drain port 16 at the bottom of the left cylinder 8, passes through the automatic valve 3 19 on the left, and is finally discharged from the drain pipe 5; it is worth mentioning that at this time, the right filter cartridge 2 is filtering, and there will be a steady stream of clear liquid flowing out from the automatic valve 17 on the right; although the automatic valve 17 and the automatic valve 3 19 on the left are in the open state, since the pipeline pressure of the automatic valve 17 is higher than that of the automatic valve 3 19, the liquid will naturally flow in, and there will be no intersection of the filtered liquid and the insect repellent liquid.

[0072] After the first backwash is completed, close the automatic valve 17 and the automatic valve 3 19 on the left, open the compressed air valve on the left, and the compressed air enters the left cylinder 8 to backwash the filter tube 12. Then open the automatic valve 17 and the automatic valve 3 19 on the left at the same time again. At this time, the clear liquid enters the left cylinder 8 from the top and exits from the bottom, and the filter tube 12 is backwashed twice.

[0073] Realize the backwash and backwash process of primary backwash → backflush → secondary backwash, and the liquid backwash pressure is 3 bar and the compressed air backflush pressure is 6 bar;

[0074] Among them, the first backwash is to use liquid fluidity to remove impurities on the surface of the filter tube 12, the backflush is to use the high-pressure characteristics of compressed air to peel off impurities embedded in the pores of the filter tube 12, and the second backwash is to use liquid fluidity to flush the impurities blown out to the drain port 16.

[0075] After backflushing and backblowing, close the compressed air valve and the automatic valve three 19 on the left, reopen the automatic valve two 18 on the left, and allow the filter cartridge 2 on the left to re-enter the filtering state.

[0076] The same applies to the right side.

[0077] The present invention allows one filter cartridge 2 to continue filtering while the other filter cartridge 2 is backwashed, thereby ensuring the continuity of the production process and reducing downtime caused by cleaning. Furthermore, the present invention first performs a liquid backwash, using the fluidity of the liquid to remove impurities on the surface of the filter tube 12; then backwashing is performed, using the high-pressure characteristics of compressed air to peel off impurities embedded in the pores of the filter tube 12; finally, a secondary liquid backwash is performed to flush the backwashed impurities to the drain port 16, which can improve the backwashing capacity. In the primary backwash and the secondary backwash, the liquid backwash pressure is set to 3 bar, and the compressed air backwash pressure is set to 6 bar. Such a pressure setting helps to more effectively peel and remove impurities.

[0078] In addition, the present invention ensures uniform cleaning of the liquid in the filter cartridge 2, improves cleaning efficiency, and avoids the problem of incomplete local cleaning by evenly arranging the ultrasonic vibration plate 10 and the ultrasonic generator under the partition plate 9. The partition plate 9 is connected to a plurality of filter tubes 12 by threads and can be disassembled as a whole from the inside of the cylinder 8. A sealing ring is used to seal between the partition plate 9 and the support plate 11. Such a design can effectively prevent liquid leakage, ensure the sealing and safety of the filtration process, and also help to keep the inside of the filter cartridge 2 clean. The outlet wire inside the ultrasonic vibration plate 10 is sealed with the cylinder 8 by a flange. Such a design not only ensures the stability of the electrical connection, but also avoids the erosion of electrical components by moisture and impurities through sealing treatment, thereby improving the durability and safety of the equipment.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultrasonic-assisted automatic backwashing filter device, characterized in that: The invention comprises two filter cartridges (2), a water outlet pipe (3), a water inlet pipe (4), a drain pipe (5), a bypass pipeline (6) and a valve group arranged on each pipeline, wherein the water outlet pipe (3) is installed at the top of the two filter cartridges (2), the water inlet pipe (4) is installed at a position close to the bottom of the two filter cartridges (2), the drain pipe (5) is installed on the bottom surface of the two filter cartridges (2), the bypass pipeline (6) is installed between the end of the water outlet pipe (3) and the end of the water inlet pipe (4), and a filtering structure is arranged inside the filter cartridge (2).

2. The ultrasonic-assisted automatic backwashing filter device according to claim 1, characterized in that: The filter cartridge (2) is composed of a sealing head (7) and a cartridge body (8), and the sealing head (7) and the cartridge body (8) are connected via a flange.

3. The ultrasonic-assisted automatic backwashing filter device according to claim 2, characterized in that: The filtering structure comprises a partition plate (9), a filtering assembly, an ultrasonic vibration plate (10) and an ultrasonic generator. The partition plate (9) is installed in a cylinder (8). The filtering assembly comprises filter tubes (12) distributed in a vertical array, and the upper parts of the plurality of filter tubes (12) are provided with external threads. The partition plate (9) is provided with threaded holes matching the external threads. The plurality of filter tubes (12) are threadedly connected to the partition plate (9). The top ends of the filter tubes (12) pass through the partition plate (9). The ultrasonic vibration plate (10) is a closed box body, and a plurality of ultrasonic generators are arranged inside the box body. An ultrasonic generator circuit is provided outside the cylinder (8).

4. The ultrasonic-assisted automatic backwashing filter device according to claim 2, characterized in that: The bottom surfaces of the two filter cartridges (2) are both provided with a concave surface with the middle portion sunken downward, a water inlet (14) is provided at a position near the bottom of the circumferential surface of the two filter cartridges (2), a water outlet (15) is provided at the top of the two sealing heads (7), and a drainage outlet (16) is provided at the lowest end of the bottom surface of the two filter cartridges (2).

5. The ultrasonic-assisted automatic backwashing filter device according to claim 4, characterized in that: The water outlet pipe (3) is installed at two water outlets (15), the water inlet pipe (4) is installed at two water inlets (14), and the drainage pipe (5) is installed at two drainage outlets (16), and the water outlet pipe (3), the water inlet pipe (4) and the drainage pipe (5) are all arranged in an F shape, the two branch pipes of the water outlet pipe (3) are respectively connected to the water outlets (15) of the two filter cartridges (2), and the end of the main pipe of the water outlet pipe (3) is in communication with the outside; the two branch pipes of the water inlet pipe (4) are respectively connected to the water inlets (14) of the two filter cartridges (2), and the end of the main pipe of the water inlet pipe (4) is in communication with the outside; the two branch pipes of the drainage pipe (5) are respectively connected to the drainage outlets (16) of the two filter cartridges (2), and the end of the main pipe of the drainage pipe (5) is in communication with the outside.

6. The ultrasonic-assisted automatic backwashing filter device according to claim 5, characterized in that: The valve group comprises two automatic valves (17) respectively installed on two branch pipes of the water outlet pipe (3), two automatic valves (18) respectively installed on two branch pipes of the water inlet pipe (4), two automatic valves (19) respectively installed on two branch pipes of the water discharge pipe (5), an automatic valve (20) installed on the bypass pipe (6), and a controller for controlling the opening and closing of the automatic valves (17), the automatic valves (18), the automatic valves (19) and the automatic valves (20).

7. The ultrasonic-assisted automatic backwashing filter device according to claim 5, characterized in that: Installation openings are provided at the two sealing heads (7) and at one side of the two water inlet pipes (4) close to the water inlet (14), and differential pressure sensors (21) are installed at the installation openings.

8. The ultrasonic-assisted automatic backwashing filter device according to claim 2, characterized in that: Air compression ports are provided at positions near the top ends of the two cylinders (8), and air compression valves (22) are installed at the two air compression ports.

9. The ultrasonic-assisted automatic backwashing filter device according to claim 8, characterized in that: The backflushing step of the filter cartridge (2) comprises: S100, calculate the momentary clogging index C of any filter cartridge (n) ; S200, determine the clogging index C of any filter cartridge at any time (n) Is it greater than the set value? If it is greater than the set value, the filter cartridge enters the backwash cleaning state.

10. The ultrasonic-assisted automatic backwashing filter device according to claim 9, characterized in that: The congestion index C at the moment (n) Obtained by the following formula: In the formula, C (n) represents the congestion index at the requested time; w i represents the weight factor; P 1n Indicates the pressure at the water outlet of the filter cartridge at the desired time; P 2n represents the pressure at the water inlet of the filter cartridge at the desired time; T n Indicates the desired time; T n-1 represents the previous moment of the desired moment; f(x) represents the fluid property parameter; Among them, the fluid property parameters Where, d p represents the particle diameter; Δρ represents the difference between the isolation and fluid density; μ represents the ability of the filter element to capture particles, which is the inherent filtration efficiency of the filter element; V flu Indicates the flow rate of the fluid.

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