An automatic backwash filter

Abstract

This invention discloses an automatic backwashing filter, comprising a main housing, within which a cylindrical filter screen is rotatably connected. An inlet is located at the bottom of the main housing, communicating with the inner cavity of the main housing through the inner cavity of the filter screen. The inner cavity of the filter screen is provided with several suction nozzles, the discharge channels of which are connected to a backwashing pipe. A high-pressure nozzle manifold is located within the inner cavity of the main housing, used to transport high-pressure liquid. Several nozzles are mounted on the high-pressure nozzle manifold, with their inlet ends communicating with the manifold and their outlet ends corresponding to the outer surface of the filter screen. This automatic backwashing filter enables uniform and consistent cleaning of the filter screen, improving cleaning efficiency and the ability of the filter screen to operate continuously online, achieving high-precision automatic filtration.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and in particular to an automatic backwashing filter. Background Technology

[0002] Backwash filters are widely used in water treatment, petrochemical, fine chemical, papermaking, steel, power, shipbuilding, municipal or agricultural irrigation and other industries. A fully automatic backwash filter generally includes a main filter support, a suction nozzle, and a filter element. The filter element includes a filter screen, which is cylindrical and mounted on the main filter support. The suction nozzle is located inside the filter screen.

[0003] When the backwash filter is in operation, close the drain port. Water enters the filter from the inlet. Under the pressure difference, the water is filtered through multiple layers of filter screens inside the filter and then discharged from the outlet for use. During backwashing, open the drain port and rotate the suction nozzle. Because the water pressure inside the suction nozzle is lower than the water pressure inside the filter element, the water is forced out of the filter through the suction port and drain port, thus cleaning the filter element.

[0004] The above-mentioned backwashing method does not effectively clean the dirt remaining on the filter screen, resulting in poor cleaning effect. After prolonged use, it will cause filter screen blockage and prevent continuous online filtration. Summary of the Invention

[0005] In view of this, the present invention provides an automatic backwashing filter, which makes it easier to clean the dirt on the filter screen, improves the cleaning efficiency, and ensures the cleaning effect.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An automatic backwash filter includes a main housing with a cylindrical filter screen rotatably connected inside. An inlet is located at the bottom of the main housing, communicating with the inner cavity of the main housing through the inner cavity of the filter screen. The inner cavity of the filter screen has several suction nozzles, the discharge channels of which are connected to a backwash pipe. A high-pressure nozzle manifold is located within the inner cavity of the main housing, used to transport high-pressure liquid. Several nozzles are mounted on the high-pressure nozzle manifold, with their inlet ends communicating with the manifold and their outlet ends corresponding to the outer surface of the filter screen.

[0008] Optionally, one end of the high-pressure nozzle manifold is connected to a first power device, which drives the high-pressure nozzle manifold to move repeatedly.

[0009] Optionally, the end of the filter screen is connected to a first motor via a rotating shaft, and the first motor drives the filter screen to rotate.

[0010] Optionally, the first power device is a rotary drive device, the rotary drive device is a second motor, the second motor is connected to the end of the high-pressure nozzle manifold through a crank-connecting rod mechanism; the crank of the crank-connecting rod mechanism is connected to the power output end of the second motor, and the connecting rod of the crank-connecting rod mechanism is connected to the high-pressure nozzle manifold.

[0011] Optionally, the first power device is a linear drive device, which is an electric cylinder or a pneumatic cylinder, and the power output end of the electric cylinder or pneumatic cylinder is connected to the high-pressure nozzle main pipe.

[0012] Optionally, the high-pressure nozzle manifold is arranged along the axis of the main housing; a plurality of nozzles corresponding to each filter screen are arranged in rows along the length direction of the high-pressure nozzle manifold, each row of nozzles corresponds to one filter screen, and the number of rows of nozzles is the same as the number of filter screens.

[0013] Optionally, multiple filters are provided, and the axis of the filters is arranged parallel to the axis of the main housing; the multiple filters are evenly arranged around the axis of the main housing.

[0014] Optionally, it also includes a high-pressure liquid delivery system, which includes a high-pressure liquid inlet, a high-pressure pump, and a high-pressure liquid outlet connected in sequence by pipelines. The high-pressure liquid outlet is connected to the inner cavity of the high-pressure chamber, and the high-pressure chamber is connected to the high-pressure nozzle main pipe. The high-pressure liquid inlet is connected to the inner cavity of the main housing 1.

[0015] Optionally, a plurality of the suction nozzles are arranged in a row along the length of the filter screen; the suction nozzles are suction nozzles with straight slit openings; a guide cover is provided at the opening position of the suction nozzle, and the opening end of the guide cover away from the suction nozzle contacts the inner surface of the filter screen.

[0016] Optionally, the suction nozzle is positioned to correspond to the nozzle position, and the suction nozzle is positioned opposite to the nozzle.

[0017] As can be seen from the above technical solution, the automatic backwashing filter provided by the present invention, by setting a suction nozzle inside the filter screen and a nozzle for spraying high-pressure cleaning fluid outside the filter screen, adopts a cleaning method that combines internal suction and external high-pressure cleaning fluid spraying during backwashing of the filter screen. This makes it easier to remove dirt from the filter screen during backwashing, and the filter screen is easier to clean, thus improving cleaning efficiency and ensuring cleaning effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an automatic backwashing filter provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of an automatic backwashing filter provided in another embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a filter screen disposed inside the main housing of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the present invention, which includes three filters inside the main housing.

[0023] Figure 5 This is a schematic diagram of the structure of the present invention, which includes four filters inside the main housing.

[0024] Figure 6 This is a schematic diagram of the structure of the present invention, which includes five filters inside the main housing.

[0025] Figure 7 This is a schematic diagram of the structure of the present invention, which includes six filters inside the main housing.

[0026] Figure 8 This is a schematic diagram of the scanning cleaning of the nozzle of the present invention;

[0027] Figure 9 This is a schematic diagram of a corrugated filter cleaning process.

[0028] Figure 10 This is a schematic diagram of cleaning a cylindrical filter screen.

[0029] in:

[0030] 1. Main housing; 2. Filter screen; 3. First motor; 4. High-pressure pump; 5. Rotary shaft; 6. Backwash valve; 7. Nozzle; 8. High-pressure nozzle main pipe; 9. Second motor; 10. Backwash pipe; 11. Suction nozzle; 12. First sealing structure; 13. Second sealing structure; 14. Linear drive device; 15. Crank-connecting rod mechanism; N1. Liquid inlet; N2. Liquid outlet; N3. Backwash outlet; N4. High-pressure liquid suction inlet; N5. High-pressure liquid output outlet; N6. High-pressure detection port; N7. Low-pressure detection port. Detailed Implementation

[0031] This invention discloses an automatic backwashing filter, which makes it easier to clean the dirt on the filter screen, improves the cleaning efficiency, and ensures the cleaning effect.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1 to 10 The automatic backwash filter of the present invention includes a main housing 1, an annular filter screen 2 rotatably connected inside the main housing 1, and a liquid inlet chamber at the bottom end of the main housing 1. The liquid inlet N1 is connected to the inner cavity of the main housing 1 through the inner cavity of the filter screen 2. A plurality of suction nozzles 11 are provided in the inner cavity of the filter screen 2, and the drain channels of the suction nozzles 11 are connected to the backwash pipe 10. The positions of the suction nozzles 11 are fixed. A high-pressure nozzle manifold 8 is provided in the inner cavity of the main housing 1. The high-pressure nozzle manifold 8 is used to transport high-pressure cleaning liquid. A plurality of nozzles 7 are provided on the high-pressure nozzle manifold 8. The inlet ends of the nozzles 7 are connected to the high-pressure nozzle manifold 8, and the nozzles 7 are used to spray high-pressure cleaning liquid from outside the filter screen 2 into the filter screen 2. The outlet ends of the nozzles 7 are correspondingly arranged on the outer surface of the filter screen 2.

[0034] The backwash pipe 10 is connected to the main drain pipe via a pipeline. Each backwash pipe 10 corresponds to a filter screen. A backwash valve 6 is installed on the main drain pipe. An outlet N2 is installed on the main housing 1. During filter operation, the liquid to be filtered enters the inlet chamber through the inlet N1. The inlet chamber is connected to the inner cavity of the filter screen 2. After filtration by the filter screen 2, the filtered liquid enters the main housing 1. A second sealing structure 13 is installed at the position where the top partition of the inlet chamber contacts the filter screen 2. The second sealing structure 13 is a mechanical seal structure commonly used in the prior art, which will not be described in detail here. A backwash outlet N3 is installed on the main drain pipe to discharge waste liquid. A high-pressure detection port N6 is installed near the inlet N1, and a first pressure sensor is installed at the high-pressure detection port N6. A low-pressure detection port N7 is installed near the outlet N2, and a second pressure sensor is installed at the low-pressure detection port N7.

[0035] The automatic backwashing filter of the present invention, by setting a suction nozzle 11 inside the filter screen 2 and a nozzle 7 for spraying high-pressure cleaning fluid outside the filter screen 2, adopts a cleaning method that combines internal suction nozzle 11 suction and external high-pressure cleaning fluid spraying during backwashing of the filter screen 2. This makes it easier to remove dirt from the filter screen 2 during backwashing, and the filter screen 2 is easier to clean, improving cleaning efficiency, ensuring cleaning effect, and enabling continuous online filtration.

[0036] To increase the spray area of ​​a single nozzle 7, one end of the high-pressure nozzle manifold 8 is connected to a first power unit, which drives the high-pressure nozzle manifold 8 to move repeatedly. During backwashing, the high-pressure nozzle manifold 8 reciprocates under the drive of the first power unit, while the suction nozzle 11 remains stationary, the filter screen 2 rotates, and the nozzles 7 perform enhanced jet cleaning in a waveform scanning manner. The high-pressure nozzle manifold 8 of the nozzle 7 reciprocates at high speed while the filter screen 2 rotates, and the actual path of the cleaning point is wavy, as shown... Figure 8 As shown, after the liquid is ejected, it diffuses into small conical jets that spray onto the outer surface of the filter screen 2. Therefore, the coarse wavy lines overlap, resulting in the spray area completely covering the entire filter screen 2, forming a waveform scan that covers the entire filter screen 2. Multiple nozzles 7 are installed on the high-pressure nozzle manifold 8. During backwashing, multiple nozzles 7 reciprocate simultaneously, achieving repeated spray cleaning of the entire filter screen 2. Each nozzle 7 corresponds to a relatively large spray area, reducing the number of nozzles 7 required. The filter screen 2 is cleaned evenly and thoroughly, avoiding any uncleaned dead corners and ensuring a more thorough cleaning and better cleaning effect.

[0037] The filter screen 2 is connected to the first motor 3 via a rotating shaft 5, which is rotatably connected to the end cover of the main housing 1. The first motor 3 drives the filter screen 2 to rotate, thereby causing the nozzle 7 to form a waveform scan covering the entire filter screen 2.

[0038] In existing technologies, a densely arranged, stationary array of multiple nozzles 7 is typically used for cleaning. When these fixed nozzles 7 clean the filter screen 2, the spacing between them must be very small, at least 10mm, to ensure a uniform cleaning effect. A large number of nozzles 7 requires a high-flow-rate, high-pressure pump, which is very expensive. If multiple filter screens 2 need to be cleaned simultaneously, the cost increases accordingly. Furthermore, starting and operating a high-power pump poses a significant challenge to the user's electrical load capacity. The automatic backwash filter of this invention, by arranging the nozzles 7 in a reciprocating motion configuration, can significantly reduce the number of nozzles 7 and increase the effective cleaning range of each nozzle 7. The cleaning range of the nozzles 7 is determined by the stroke of the reciprocating motion of the high-pressure nozzle manifold 8.

[0039] In one specific embodiment, such as Figure 1 , Figure 2 , Figures 4 to 7As shown, multiple filter screens 2 are provided, and the high-pressure nozzle manifold 8 is arranged along the axis of the main housing 1, that is, the high-pressure nozzle manifold 8 is located at the center of the inner cavity of the main housing 1. "Multiple" here refers to the number of filter screens 2 being two or more. Several nozzles 7 corresponding to each filter screen 2 are arranged in rows along the length of the high-pressure nozzle manifold 8, with each row of nozzles 7 corresponding to one filter screen 2. The number of rows of nozzles 7 is the same as the number of filter screens 2. Several rows of nozzles 7 are fixedly connected to the high-pressure nozzle manifold 8. When the high-pressure nozzle manifold 8 moves repeatedly, it drives the nozzles 7 to move repeatedly. Simultaneously, the suction nozzles 11 are fixed at different positions, making the structure of the spray-wash combined cleaning mechanism of this invention simpler and more reliable.

[0040] Furthermore, the axis of the filter screen 2 is arranged parallel to the axis of the main housing 1. Multiple filter screens 2 are evenly arranged around the axis of the main housing 1.

[0041] In another specific embodiment, such as Figure 3 As shown, there is one filter screen 2, and the high-pressure nozzle manifold 8 is located inside the main housing 1 on one side. The axis of the filter screen 2 is set along the axis of the main housing 1.

[0042] Specifically, the first power device is a rotary drive device, which is a second motor 9. To convert the rotation of the second motor 9 into the reciprocating motion of the high-pressure nozzle manifold 8, the second motor 9 is connected to the end of the high-pressure nozzle manifold 8 via a crank-connecting rod mechanism 15. The crank-connecting rod mechanism 15 includes a crank and a connecting rod rotatably connected together. The crank is connected to the power output end of the second motor 9, and the connecting rod is connected to the high-pressure nozzle manifold 8. The high-pressure nozzle manifold 8 is vertically arranged, and the second motor 9 is located on the high-pressure chamber at the top of the high-pressure nozzle manifold 8. The crank-connecting rod mechanism 15 is located within the high-pressure chamber, which is isolated from the inner cavity of the main housing 1 by a top cover. To achieve a seal at the point where the upper end of the high-pressure nozzle manifold 8 passes through the top cover, a first sealing structure 12 is provided at the point of passage of the high-pressure nozzle manifold 8 on the top cover. The first sealing structure 12 is a commonly used sealing structure for moving rods in the art, and will not be described in detail here.

[0043] Specifically, the second motor 9 is a geared motor. The geared motor drives the crank, which in turn drives the connecting rod. The connecting rod is fixed by a guide ring, and the connecting rod drives the high-pressure nozzle manifold 8 in a reciprocating motion. Except for the geared motor, all components are housed within the casing of the high-pressure chamber. The drive shaft of the geared motor uses a commonly used packing seal or mechanical seal. This reciprocating motion structure does not require any limit switches, is simple and reliable, and can perform high-speed reciprocating motion.

[0044] In another embodiment, the first power unit is a linear drive device 14, with other structures the same as in the previous embodiment. The linear drive device 14 is an electric cylinder or a pneumatic cylinder, and the power output end of the electric cylinder or pneumatic cylinder is connected to the high-pressure nozzle manifold 8.

[0045] The automatic backwash filter of the present invention also includes a high-pressure liquid delivery system. The high-pressure liquid delivery system includes a high-pressure liquid inlet N4, a high-pressure pump 4, and a high-pressure liquid outlet N5, which are sequentially connected via pipelines. The high-pressure liquid outlet N5 is located on the housing of the high-pressure chamber and communicates with the inner cavity of the high-pressure chamber. The inner cavity of the high-pressure chamber is connected to the high-pressure nozzle manifold 8. The high-pressure chamber provides high-pressure flushing liquid to the nozzles 7 on the high-pressure nozzle manifold 8. In this embodiment, the high-pressure liquid inlet N4 is located on the main housing 1 and communicates with the inner cavity of the main housing 1 containing the filtered liquid, using the filtered liquid inside the main housing 1 to backwash the filter screen 2. In other embodiments, the high-pressure liquid inlet N4 is connected to an external container containing clean liquid. Specifically, the high-pressure pump 4 is a multi-stage centrifugal pump or a plunger pump, or other types of pumps, which are not limited here and are selected according to the liquid characteristics and industry application requirements. The pump's flow rate and head are determined according to the requirements of the spray cleaning, which is determined by the spray pressure and the number of nozzles 7, and are matched through experiments.

[0046] To ensure effective rinsing and improve efficiency, the suction nozzles 11 are positioned corresponding to the nozzles 7, with the nozzles 11 and nozzles 7 positioned opposite each other. Several suction nozzles 11 are arranged in rows along the length of the filter screen 2, with one row of nozzles 11 inside each filter screen 2. Specifically, the suction nozzles 11 are straight-slit openings. The suction nozzles 11 flow into the backwash pipe 10 through a funnel-shaped drain channel. The backwash pipe 10 has a segmented structure, ensuring even suction distribution across each nozzle 11 and preventing weak suction in the upper sections. Flexible guide covers are installed at the openings of the suction nozzles 11. These guide covers are open at both ends; one end fits into the nozzle 11, and the other end contacts the inner surface of the filter screen 2. The guide covers adhere to the inner surface of the filter screen 2, preventing liquid from flowing to the sides of the nozzles 11 during backwashing. The guide cover creates a relatively sealed structure between the opening of the suction nozzle 11 and the inner surface of the filter screen 2. This structure allows the suction nozzle 11 to generate a higher pressure difference between the inner and outer sides of the corresponding filter screen 2 position, thereby improving the backwashing effect and reducing the amount of waste liquid discharged.

[0047] Furthermore, filter 2 is a corrugated filter or a cylindrical filter, such as... Figure 9As shown in Figure 10. The cylindrical filter screen has a simple structure, is economical in cost, and is easy to clean. The filtration area of ​​the corrugated filter screen is several times larger than that of the cylindrical filter screen, and the filtration flow rate and dirt holding capacity are correspondingly increased several times, resulting in a significant improvement in product performance. The high-pressure jet sprayed from nozzle 7 can enter the gap between the corrugations and pass through the filter screen to wash away particulate impurities. The particulate impurities flow away through suction nozzle 11, and the corrugated filter screen can be cleaned efficiently.

[0048] Understandably, the backwash valve 6 is an electrically controlled valve. The first pressure sensor, the second pressure sensor, the backwash valve 6, the first power unit, and the first motor 3 are all electrically connected to the controller, which is a microcontroller or PLC commonly used in the prior art. The arrows in the figure indicate the direction of liquid flow.

[0049] When the automatic backwash filter of the present invention is working normally, liquid flows into the inlet chamber through the inlet N1 of the filter, flows into the filter screen 2 through the inlet chamber, and then passes through the filter screen 2 from the inside to the outside, and flows out from the outlet N2. Impurity particles are intercepted on the inner surface of the filter screen 2. When the impurity particles on the surface of the filter screen 2 accumulate and the filter pores are gradually blocked, the filtration pressure drop (the measurement difference between the first pressure sensor and the second pressure sensor) increases. When the preset differential pressure is reached (e.g., 50 kPa), the controller starts the self-cleaning action.

[0050] Self-cleaning process: The controller opens the backwash valve 6 and starts the high-pressure pump 4. Simultaneously, the first motor 3 drives the filter screen 2 to rotate, while the suction nozzle 11 remains stationary. The suction nozzle 11 is connected to the central backwash pipe 10 and ultimately to the backwash valve 6. After the backwash valve 6 is opened, the main drain pipe is connected to the outside atmosphere, and the internal pressure of the main drain pipe decreases. A pressure difference is formed between the outside and inside of the filter screen 2 where the suction nozzle 11 is attached. This pressure difference drives the filtered liquid to flow at high speed to flush the filter screen 2. Impurities on the inner surface of the filter screen 2 are carried away by the backwash and flow out through the backwash pipe 10 and the backwash valve 6. The filter screen 2 is clean and can continue filtering.

[0051] During backwashing, the high-pressure pump 4 draws in filtered clean liquid or external cleaning liquid and pumps it into the high-pressure chamber at the top of the filter. The liquid flows in from the hollow high-pressure nozzle manifold 8 and is ejected through the nozzle 7. The pressure of the liquid ejected from the nozzle 7 depends on the type of high-pressure pump 4. The nozzle 7 ejects a high-speed jet to clean the filter screen 2. The nozzle 7 moves up and down reciprocatingly, spraying and cleaning the entire area of ​​the filter screen 2 aligned with the straight-slit-shaped suction nozzle 11. Impurities are thoroughly washed away and peeled off from the filter screen aperture, and discharged through the suction nozzle 11 and the backwash pipe 10. After the filter screen 2 rotates once, all filter surfaces are cleaned. The high-pressure pump 4, backwash valve 6, first motor 3, and first power unit are then turned off, and one self-cleaning cycle ends.

[0052] The automatic backwash filter of this invention eliminates the need for manual cleaning of the filter screen, representing a significant advancement in automatic filtration. The cleaning process of this automatic backwash filter includes internal suction and external spraying, rotation of the filter screen 2, and reciprocating motion of the nozzle 7, ensuring uniform and thorough cleaning of all surfaces of the filter screen 2. This solves the problem of filter screen 2 easily clogging in existing automatic backwash filters, preventing thorough backwashing. The automatic backwash filter of this invention has a simple and reliable structure, is modular and flexibly expandable, and meets the needs of high-flow-rate, high-pollution-holding filtration.

[0053] The automatic backwashing filter of this invention combines self-backwashing and externally enhanced backwashing, enabling the filter to be used for high-precision filtration up to 3 microns, and also for filtering impurity particles that are difficult to remove through backwashing. After the filter screen is thoroughly cleaned, a higher backwashing start differential pressure can be set, and backwashing can be initiated only when the filter cake has accumulated to a thicker consistency. Therefore, during continuous operation, the concentration of impurity particles in the backwash wastewater is higher, and the wastewater discharge is less, thereby reducing the load and treatment costs of the downstream wastewater receiving system.

[0054] In the description of this solution, it should be understood that the terms "upper", "lower", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship 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 orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this solution.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic backwashing filter, comprising a main housing, wherein a cylindrical filter screen is rotatably connected inside the main housing, and an inlet is provided at the bottom end of the main housing, the inlet communicating with the inner cavity of the main housing through the inner cavity of the filter screen, characterized in that, The filter screen has a plurality of suction nozzles in its inner cavity. The suction nozzles are fixed in position and their drain channels are connected to the backwash pipe. The main housing has a high-pressure nozzle manifold in its inner cavity. The high-pressure nozzle manifold is used to transport high-pressure liquid. The high-pressure nozzle manifold has a plurality of nozzles. The inlet end of each nozzle is connected to the high-pressure nozzle manifold, and the outlet end of each nozzle is correspondingly positioned to the outer surface of the filter screen. One end of the high-pressure nozzle manifold is connected to the first power device, which drives the high-pressure nozzle manifold to move repeatedly. The high-pressure nozzle manifold is arranged along the axis of the main housing and moves back and forth along the axis of the main housing. The end of the filter screen is connected to the first motor via a rotating shaft, and the first motor drives the filter screen to rotate. A plurality of the suction nozzles are arranged in a row along the length of the filter screen; the suction nozzles are suction nozzles with straight slit openings; a guide cover is provided at the opening position of the suction nozzle, and the opening end of the guide cover away from the suction nozzle contacts the inner surface of the filter screen; the position of the suction nozzles corresponds to the position of the nozzles.

2. The automatic backwashing filter according to claim 1, characterized in that, The first power device is a rotary drive device, which is a second motor. The second motor is connected to the end of the high-pressure nozzle manifold via a crank-connecting rod mechanism. The crank of the crank-connecting rod mechanism is connected to the power output end of the second motor, and the connecting rod of the crank-connecting rod mechanism is connected to the high-pressure nozzle manifold.

3. The automatic backwashing filter according to claim 1, characterized in that, The first power unit is a linear drive device, which is an electric cylinder or a pneumatic cylinder, and the power output end of the electric cylinder or pneumatic cylinder is connected to the high-pressure nozzle main pipe.

4. The automatic backwashing filter according to claim 1, characterized in that, Each filter screen has several nozzles arranged in rows along the length of the high-pressure nozzle manifold, with each row of nozzles corresponding to one filter screen, and the number of rows of nozzles being the same as the number of filter screens.

5. The automatic backwashing filter according to claim 4, characterized in that, Multiple filters are provided, and the axis of each filter is arranged parallel to the axis of the main housing; the multiple filters are evenly arranged around the axis of the main housing.

6. The automatic backwashing filter according to claim 1, characterized in that, It also includes a high-pressure liquid delivery system, which includes a high-pressure liquid inlet, a high-pressure pump, and a high-pressure liquid outlet connected in sequence by pipelines. The high-pressure liquid outlet is connected to the inner cavity of the high-pressure chamber, and the high-pressure chamber is connected to the main high-pressure nozzle pipe. The high-pressure liquid inlet is connected to the inner cavity of the main housing.

7. The automatic backwashing filter according to claim 1, characterized in that, The suction nozzle is positioned opposite to the nozzle.

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