Water primary filtering device for waterworks

Abstract

The utility model relates to a water body primary filtering device for a waterworks, which comprises a primary screening pipe body connected with a water source through a water delivery pipeline, and the output end of the primary screening pipe body is connected with a water treatment system capable of carrying out precipitation filtration and chemical disinfection through a drain valve. An input pipe body of the primary screening pipe body is connected with at least two branch filtering pipe bodies connected in parallel at the output end of the primary screening pipe body in the mode that water flow input into a pipe cavity of the primary screening pipe body can be divided, and the branch filtering pipe bodies communicate with an output pipe body in a confluence mode. A back-flushing filtering assembly for primarily screening and filtering water flow is arranged in the branch filtering pipe body, and the back-flushing filtering assembly is matched with a pipe cavity of the branch filtering pipe body to form a back-flushing cavity channel in a manner that a filter screen structure constructed by the back-flushing filtering assembly can be dredged by utilizing back-flushing air flow. According to the utility model, the filtering structure can be maintained without being disassembled in the process of continuously transferring the water body without stopping the machine, so that the continuous conveying capacity of the water body and a relatively strong filtering effect are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of water filtering equipment, in particular to a water primary filtering device for a water plant. Background Art

[0002] Tap water is an indispensable water source in people's daily life. However, since the quality of tap water is affected by many factors such as the water source and the transmission pipeline, it is often contaminated by various harmful substances and microorganisms, such as silt, rust, residual chlorine, heavy metals, bacteria, viruses, etc. These pollutants not only affect the taste and color of water, but also endanger human health. Therefore, people need to properly treat tap water to improve the quality and safety of water. Especially when drawing water from the water source, due to the directional traction of the suction on the water body, it is very easy to cause the water body to be mixed with particles such as silt. Such particulate impurities have a more obvious effect on the subsequent biochemical filtration and disinfection effect. Therefore, conventional tap water plants will set up a pre-sedimentation tank to precipitate and separate the particles. However, when transferring the water body, it is very easy to drive some of the precipitated impurities to continue to move forward with the water body due to the traction suction, thereby reducing the efficiency and quality of sedimentation filtration.

[0003] In addition, although existing water plants have introduced filter screens to remove particulate impurities, all current filter screens are clogged by particulate matter and cannot continuously and efficiently filter water. Such filter structures usually require regular maintenance, that is, shutting down and disassembling the filter screen for cleaning and dredging, which is not only time-consuming and labor-intensive, but also reduces the efficiency of water filtration and the overall cost of water treatment. Therefore, there is a need for a water treatment device that can locate, maintain and dredge the filter structure without shutting down the machine or disassembling the filter structure while maintaining the integrity of the water filtration and delivery system. Utility Model Content

[0004] The utility model aims to provide a water preliminary filtration device for a waterworks which can ensure continuous water delivery capacity and strong filtering effect by performing non-disassembly maintenance on the filtering structure during the process of continuous water transport without stopping the machine, so as to solve the problem that the existing filtering equipment for waterworks needs to be shut down regularly to maintain the filtering structure to avoid clogging of the filtering structure and ensure the filtering effect, but the shutdown maintenance operation is cumbersome, the labor cost is high and the filtering efficiency is affected, and the existing filtering equipment for waterworks cannot achieve continuous and efficient water filtration, and the shutdown and disassembly maintenance operation greatly reduces the continuous water delivery efficiency, thereby indirectly increasing the cost of use.

[0005] The technical solution adopted by the utility model is: a water body primary filtration device for a tap water plant, comprising a primary screening tube body connected to a water source through a water supply pipeline, the output end of the primary screening tube body being connected to a water treatment system capable of sedimentation filtration and chemical disinfection through a drain valve, the input tube body of the primary screening tube body being connected to at least two parallel branch filter tube bodies at its output end in a manner capable of diverting the water flow input into its tube cavity, and the branch filter tube body being connected to the output tube body in a converging manner, wherein a backwash filter assembly for primary filtration of the water flow is arranged in the branch filter tube body, and the backwash filter assembly cooperates with the tube cavity of the branch filter tube body to form a backwash cavity in a manner capable of utilizing the backwash airflow to clear the filter screen structure constructed thereby.

[0006] According to a preferred embodiment, the branch filter tube body includes a special-shaped tube cavity, a first inlet tube cavity, a second outlet tube cavity and a third common tube cavity, wherein the first inlet tube cavity, the special-shaped tube cavity, the third common tube cavity and the second outlet tube cavity are connected in sequence to form a water flow tube cavity, and the special-shaped tube cavity and the third common tube cavity can cooperate with the backwash filter assembly to construct a backwash cavity that can be selectively isolated from the water flow tube cavity.

[0007] According to a preferred embodiment, the backwash filter assembly includes a filter plate, an air inlet pipe, an air outlet pipe, a rotating baffle, an outlet valve, a hydraulic limit column and a blowing unit, wherein the filter plate is horizontally embedded in the third common tube cavity, and the air inlet pipe is connected to the tube wall of the third common tube cavity downstream of the filter plate; the air outlet pipe is connected to the tube wall of the special-shaped tube cavity away from the air inlet pipe, and the rotating baffle capable of blocking the pipe opening of the air outlet pipe is rotatably connected to the inner wall thereof close to the air outlet pipe.

[0008] According to a preferred embodiment, the hydraulic limit column is hinged on the lower surface of the rotating baffle, and the end of the hydraulic limit column away from the rotating baffle is hinged on the inner wall of the outlet pipe, so that the hydraulic limit column drives the rotating baffle to rotate in an adjustable telescopic manner to block the inlet pipe opening of the special-shaped lumen.

[0009] According to a preferred embodiment, the outlet end of the third common lumen is also provided with the outlet valve capable of adjustably sealing it; and the blowing unit for directional input of high-pressure dredging airflow is provided in the air inlet pipe.

[0010] According to a preferred embodiment, a stepped annular groove is opened on the tube wall of the special-shaped tube cavity, and the rotating baffle is rotatably connected to the step edge of the stepped annular groove, so that the rotating baffle can be adjusted to fill and shield the groove cavity defined by the stepped annular groove in a manner that its plate body can fit with the stepped annular groove; the air outlet pipe is connected to the inner chamber of the special-shaped tube cavity in a manner of penetrating the bottom surface of the stepped annular groove.

[0011] According to a preferred embodiment, a close-fitting step that can match the plate body contour of the rotating baffle is also provided on the inlet side of the special-shaped tubular cavity, so that the rotating baffle rotates clockwise under the drive of the hydraulic limit column and abuts against the close-fitting step, thereby adjusting the inlet of the special-shaped tubular cavity to block it.

[0012] According to a preferred embodiment, a sealing strip matching the close-fitting step is provided on the upper plate surface of the rotating baffle; and an annular sealing strip matching the annular surface of the stepped annular groove is provided on the lower plate surface of the rotating baffle.

[0013] According to a preferred embodiment, an arc-shaped protrusion is also provided on the upper plate surface of the rotating baffle.

[0014] According to a preferred embodiment, a water inlet valve is also provided on the input pipe body of the primary screening pipe body.

[0015] The beneficial effects of the utility model are:

[0016] The primary screening tube body provided in the present application diverts the water flow by constructing a branch filter tube body, so that the diverted water flow can more effectively complete the particle filtering treatment, and the branch filter tube body ensures the continuous and uninterrupted water supply capacity of the primary screening tube body by intermittent staggered conduction. At the same time, the intermittently disconnected branch filter tube body can regularly clear the filtering structure of the backwash filter assembly arranged on the branch filter tube body through the backwash airflow without disassembly, thereby ensuring its filtration efficiency, and then the synchronous conduction and intermittent disconnection maintenance of the two branch filter tube bodies ensure the continuous filtering water delivery of the primary screening tube body, which greatly improves the water filtration efficiency of the device under long-term working conditions, reduces maintenance costs and difficulties, and reduces the comprehensive cost of water treatment of the device. The backwash filter assembly provided in the present application can form a backwash cavity which is different from the water flow cavity defined by the branch filter tube body by regularly isolating the branch filter tube body in which it is located, thereby clearing the filter mesh holes of the filter structure constructed by it that are blocked by particulate impurities through the backwash airflow, thereby quickly completing the clearing of the filter structure without disassembling the pipeline structure, greatly improving the comprehensive filtration efficiency and effect, and avoiding the high manpower and time costs caused by shutdown maintenance. The mutual cooperation of the two parallel backwash filter assemblies can ensure that the primary screening tube body can always maintain a state of continuous water delivery, avoiding the defect that the existing filter structure needs to be completely shut down for maintenance and the water delivery efficiency is reduced. The adjustably constructed backwash cavity can improve the efficiency and convenience of maintenance and clearing, and greatly improve the comprehensive water filtration performance of the primary screening tube body provided with the backwash filter assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a preferred water body primary filtration device for a water plant proposed by the utility model;

[0018] Figure 2 It is a structural schematic diagram of a preferred waterworks water body primary filtration device proposed by the utility model when a backwash cavity is constructed;

[0019] Figure 3 This is an enlarged structural schematic diagram of the A region of a preferred water body primary filtration device for a water plant proposed by the utility model;

[0020] Figure 4 This is an enlarged structural schematic diagram of the B area of ​​a preferred water body primary filtration device for a water plant proposed by the utility model;

[0021] Figure 5 The utility model is a schematic structural diagram of a primary screening tube body of a preferred primary filtering device for water bodies used in a waterworks.

[0022] Reference numerals list

[0023] 1: primary screening tube body; 2: drain valve; 3: backwash filter assembly; 4: water inlet valve; 11: input tube body; 12: branch filter tube body; 13: output tube body; 121: special-shaped tube cavity; 122: first inlet tube cavity; 123: second outlet tube cavity; 124: third common tube cavity; 31: filter plate; 32: air inlet pipe; 33: air outlet pipe; 34: rotating baffle; 35: outlet valve; 36: hydraulic limit column; 37: blowing unit; 38: close-fitting rotating shaft; 1211: stepped ring groove; 1212: close-fitting step; 341: sealing strip; 342: annular sealing rubber strip; 343: arc-shaped protrusion. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be briefly introduced below in combination with the drawings and the descriptions of the embodiments or the prior art. Obviously, the following descriptions of the structures of the drawings are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] The technical solution provided by the present invention will be described in detail below by way of embodiments with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In some examples, some implementation methods are not described or are not described in detail because they belong to existing or conventional technologies.

[0026] In addition, the technical features recorded in this article, or the steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can also be combined in any suitable manner in one or more embodiments. For those skilled in the art, it is easy to understand that the steps or operation sequence of the methods related to the embodiments provided herein can also be changed. Any order in the drawings and embodiments is only for illustrative purposes and does not imply a requirement to follow a certain order unless it is explicitly stated that a certain order is required.

[0027] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, under reasonable circumstances (not constituting a self-contradiction), include direct and indirect connections (couplings).

[0028] The following is a detailed description with reference to the accompanying drawings.

[0029] Example 1

[0030] The present application provides a water primary filtration device for a water plant, which comprises a primary screening pipe body 1, a drain valve 2, a backwash filter assembly 3 and a water inlet valve 4.

[0031] according to Figure 1-5In a specific embodiment shown, the input end of the primary screening tube body 1 is connected to a water source through a water supply pipeline. The output end of the primary screening tube body 1 is connected to a water treatment system capable of sedimentation filtration and chemical disinfection through a drain valve 2. A backwash filter assembly 3 for primary screening of the water flow is arranged in the primary screening tube body 1. A water inlet valve 4 is also arranged on the input tube body 11 of the primary screening tube body 1. The backwash filter assembly 3 can be adjusted to cut off the lumen of the primary screening tube body 1 and construct a backwash cavity in combination with a part of the lumen of the input tube body 11, so as to periodically reversely clear the filter structure constructed by it, thereby improving the comprehensive filtration efficiency of the backwash filter assembly 3 under the long-term working state. The primary screening tube body 1 is configured with part of the lumen where the backwash filter assembly 3 is installed as a parallel branch, so that a larger water flow can be filtered by setting at least two parallel backwash filter assemblies 3, and the backwash filter assembly 3 in the branch can be unblocked to remove impurities by intermittent interruption to ensure the continuous water transport function of the primary screening tube body 1, and the non-disassembly backwash unblocking reduces the maintenance difficulty, tediousness and time cost of the filtering structure. The primary screening tube body 1 provided in the present application diverts the water flow by constructing a branch filter tube body 12, so that the diverted water flow can more effectively complete the particle filtering treatment, and the branch filter tube body 12 ensures the continuous and uninterrupted water supply capacity of the primary screening tube body 1 by intermittent staggered conduction. At the same time, the intermittently disconnected branch filter tube body 12 can regularly clear the filtering structure of the backwash filter assembly 3 arranged on the branch filter tube body 12 through the backwash airflow without disassembly, thereby ensuring its filtration efficiency, and then the synchronous conduction and intermittent disconnection maintenance of the two branch filter tube bodies 12 ensure the continuous filtering water delivery of the primary screening tube body 1, which greatly improves the water filtration efficiency of the device under long-term working conditions, reduces maintenance costs and difficulties, and reduces the comprehensive cost of water treatment by the device. The backwash filter assembly 3 provided in the present application can form a backwash cavity which is different from the water flow cavity defined by the branch filter tube body 12 by regularly isolating the branch filter tube body 12 in which it is located, thereby clearing the filter mesh holes of the filter structure constructed by it that are blocked by particulate impurities through the backwash airflow, thereby quickly completing the clearing of the filter structure without disassembling the pipeline structure, greatly improving the comprehensive filtration efficiency and effect, and avoiding the high manpower and time costs caused by shutdown maintenance, and the mutual cooperation of the two parallel backwash filter assemblies 3 can ensure that the primary screening tube body 1 can always maintain a state of continuous water transportation, avoiding the defect that the existing filter structure needs to be completely shut down for maintenance and reduces the water transportation efficiency, and the adjustably constructed backwash cavity can improve the efficiency and convenience of maintenance and clearing, greatly improving the comprehensive water filtration performance of the primary screening tube body 1 provided with the backwash filter assembly 3.

[0032] Preferably, the primary screening tube body 1 comprises an input tube body 11, a branch filter tube body 12 and an output tube body 13. Preferably, the input tube body 11 is connected to at least two parallel branch filter tube bodies 12 at its output end in a manner that can divert the water flow input into its tube cavity. Preferably, the branch filter tube body 12 is connected to the output tube body 13 in a converging manner. Preferably, a backwash filter assembly 3 for primary screening of the water flow is arranged in the branch filter tube body 12. Specifically, the backwash filter assembly 3 forms a backwash cavity in cooperation with the tube cavity of the branch filter tube body 12 in a manner that can utilize the backwash airflow to dredge the filter screen structure constructed thereby and ensure the filtration efficiency. The branch filter tube body 12 provided in the present application constructs a plurality of parallel branches by connecting end to end, so that the water flow is diverted to different branch filter tube bodies 12 to complete efficient and continuous filtration. The multiple branch filter tubes 12 provided in the present application can ensure continuous filtration of the primary screening tube 1 while completing the interval dredging and maintenance of different backwash filter components 3 through intermittent disconnection, thereby achieving continuous transportation while improving the filtration efficiency.

[0033] Preferably, the branch filter tube body 12 includes a special-shaped tube cavity 121, a first inlet tube cavity 122, a second outlet tube cavity 123 and a third common tube cavity 124. Preferably, a plurality of different inlets, outlets and sewage outlets are provided on different cavity walls of the special-shaped tube cavity 121, and the inlet or sewage outlet is adjustable to block the inlet or sewage outlet in accordance with the ability to allow the rotating baffle 34 to rotate in its inner cavity to define a curved arc tube cavity with different functional cavities. Further preferably, the first inlet tube cavity 122, the special-shaped tube cavity 121, the third common tube cavity 124 and the second outlet tube cavity 123 are connected in sequence to form a water flow tube cavity. Further preferably, the special-shaped tube cavity 121 and the third common tube cavity 124 can cooperate with the backwash filter assembly 3 to construct a backwash channel that can be selectively isolated from the water flow tube cavity. Preferably, a stepped annular groove 1211 is provided on the tube wall of the special-shaped tube cavity 121. Preferably, the inlet side of the special-shaped lumen 121 is also provided with a close-fitting step 1212 that can match the plate body contour of the rotating baffle 34, so that the rotating baffle 34 rotates clockwise under the drive of the hydraulic limit column 36 and abuts against the close-fitting step 1212, thereby adjusting the inlet of the special-shaped lumen 121 to block the water flow lumen and define the backwash cavity. The branch filter tube body 12 provided in the present application can cooperate with the backwash filter assembly 3 to construct in stages a water flow lumen that allows directional filtering flow of the water body and a backwash cavity formed by cutting off the water flow lumen defined by the branch filter tube body 12, so that the backwash filter assembly 3 can complete the water body filtration and the dredging of the periodic filtration pores without disassembling the branch filter tube body 12 and the backwash filter assembly 3, so as to ensure that it can have a high filtration efficiency for a long time, while ensuring its filtration effect and quality on the water body.

[0034] Preferably, the backwash filter assembly 3 includes a filter plate 31, an air inlet pipe 32, an air outlet pipe 33, a rotating baffle 34, an outlet valve 35, a hydraulic limit column 36, a blowing unit 37 and a close-fitting rotating shaft 38. Preferably, the filter plate 31 is horizontally embedded in the third common tube cavity 124. Preferably, the air inlet pipe 32 is connected to the tube wall of the third common tube cavity 124 downstream of the filter plate 31. Further preferably, a one-way guide valve is provided in the air inlet pipe 32 to limit the one-way discharge of the air flow and limit the reverse overflow of the water flow. Preferably, the air outlet pipe 33 is connected to the tube wall of the special-shaped tube cavity 121 away from the air inlet pipe 32. Further preferably, a rotating baffle 34 capable of blocking the pipe opening of the air outlet pipe 33 is rotatably connected to the inner wall of the special-shaped tube cavity 121 close to the air outlet pipe 33. Preferably, a hydraulic limit column 36 is hinged on the lower surface of the rotating baffle 34. Specifically, one end of the hydraulic limit column 36 away from the rotating baffle 34 is hinged on the inner wall of the outlet pipe 33, so that the hydraulic limit column 36 drives the rotating baffle 34 to rotate in an adjustable and retractable manner to block the inlet pipe opening of the special-shaped tube cavity 121. Preferably, the outlet end of the third common tube cavity 124 is also provided with an outlet valve 35 that can be adjusted to block it. Preferably, a blowing unit 37 for directional input of high-pressure dredging airflow is provided in the air inlet pipe 32. Specifically, the blowing unit 37 can be a high-pressure air pump, so that it can directional output high-pressure airflow to dredge the filter plate 31 with high-pressure airflow. The exhaust port of the high-pressure air pump can be directly connected to the inlet end of the air inlet pipe 32, and a solenoid valve is provided in its exhaust port, which is connected to the air inlet pipe 32 only when it starts to work, so as to avoid water vapor corrosion caused by overflowing water vapor to its internal components. The rotating baffle 34 provided in the present application can cooperate with the outlet valve 35 to adjustably change its position and define different working conditions, so that part of the special-shaped tube cavity 121 can adjustably assist in constructing a water flow tube cavity and a backwash cavity. The filter plate 31 provided in the present application can filter the water flowing through the special-shaped tube cavity 121, thereby ensuring the effectiveness of the filtration. The air inlet pipe 32 and the air outlet pipe 33 provided in the present application can form a backwash cavity with the special-shaped tube cavity 121, so that the high-pressure airflow output by the blowing unit 37 provided in the air inlet pipe 32 can pass through the filter plate 31 in the reverse direction, thereby blowing and clearing the filter holes of the filter plate 31 blocked by particulate impurities, and the particulate impurities cleared in the reverse direction can be discharged through the air outlet pipe 33, thereby improving the filtration efficiency and effect of the filter plate 31.

[0035] Preferably, the rotating baffle 34 is rotatably connected to the step edge of the step annular groove 1211 through a close-fitting rotating shaft 38, so that the rotating baffle 34 can adjustably fill and shield the groove cavity defined by the step annular groove 1211 in a manner that its plate body can fit with the step annular groove 1211. Further preferably, the close-fitting rotating shaft 38 is a rotating connecting shaft whose surface is filled with a sealing silicone pad layer to ensure the airtightness of the connection. Preferably, the air outlet pipe 33 is connected to the inner chamber of the special-shaped tube cavity 121 in a manner of penetrating the bottom surface of the step annular groove 1211. Preferably, a sealing strip 341 matching the close-fitting step 1212 is provided on the upper plate surface of the rotating baffle 34. The sealing strip 341 can improve the sealing of the partition shielding to reduce the risk of water leakage. Preferably, an annular sealing strip 342 that can match the annular surface of the stepped annular groove 1211 is provided on the lower plate surface of the rotating baffle 34 to fill the docking gap between the rotating baffle 34 and the stepped annular groove 1211. The annular sealing strip 342 can ensure the sealing of the water flow lumen, so that the water body can flow in a directional manner without leakage. Preferably, an arc-shaped protrusion 343 that can utilize the impact of water flow to enhance the pressing strength of the rotating baffle 34 into the stepped annular groove 1211 is also provided on the upper plate surface of the rotating baffle 34. The arc-shaped protrusion 343 can generate a downward pressure component during the directional flow of the water body, so that the rotating baffle 34 is pressed tightly and embedded in the stepped annular groove 1211, thereby enhancing the blocking effect.

[0036] The working principle of this application is:

[0037] When the branch filter tube body 12 is used to convey water, the rotating baffle 34 is embedded in the stepped annular groove 1211 to block the restricted by the shortened length of the hydraulic limit column 36, and the sealing of the embedding is ensured by the annular sealing strip 342 to achieve the isolation of the air outlet pipe 33. At the same time, the outlet valve 35 is opened to connect the second outlet tube cavity 123 and the third common tube cavity 124. In addition, the blowing unit 37 is in a shutdown state and the inlet of the air inlet pipe 32 is closed to construct a water flow tube cavity in which the first inlet tube cavity 122, the special-shaped tube cavity 121, the third common tube cavity 124 and the second outlet tube cavity 123 are connected in sequence. When the filter plate 31 needs to be backwashed and unblocked, the outlet valve 35 disconnects the second outlet cavity 123 from the third common cavity 124; the rotating baffle 34 rotates clockwise under the drive of the gradually elongated hydraulic limit column 36 and gradually places in the special-shaped cavity 121, thereby blocking the entrance of the special-shaped cavity 121 by abutting against the close-fitting step 1212, and at the same time, the blocking of the outlet pipe 33 is released, and the sealing of the partition is ensured by the sealing strip 341 on the surface of the rotating baffle 34. Then, the blowing unit 37 starts to work and communicates with the air inlet pipe 32, so that the pressurized air flow is input into the third common cavity 124 through the air inlet pipe 32 and reversely passes through the filter plate 31 to complete the unblocking of the filter plate 31, and then the air flow carrying particulate matter is discharged from the outlet pipe 33. After the reverse unblocking and cleaning is completed, the water flow cavity is constructed again to continue the transportation and filtration of the water body, thereby ensuring the efficiency and quality of the long-term filtration of the water body.

[0038] The present utility model is not limited to the above optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope of the claims of the present utility model fall within the protection scope of the present utility model. Those skilled in the art should understand that the present utility model specification and its drawings are illustrative and do not constitute limitations on the claims. The protection scope of the present utility model is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional method and should not be understood as having to be set. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A water primary filtration device for a waterworks, comprising a primary filtration tube body (1) connected to a water source via a water delivery pipeline, wherein the output end of the primary filtration tube body (1) is connected to a water treatment system capable of sedimentation filtration and chemical disinfection via a drain valve (2), characterized in that: The input tube body (11) of the primary screening tube body (1) is connected to at least two parallel branch filter tube bodies (12) at its output end in a manner that can divert the water flow input into its tube cavity, and the branch filter tube bodies (12) are connected to the output tube body (13) in a converging manner, wherein: A backwash filter assembly (3) for initially filtering the water flow is arranged in the branch filter tube body (12); the backwash filter assembly (3) cooperates with the tube cavity of the branch filter tube body (12) to form a backwash cavity in a manner that the filter screen structure constructed by the backwash filter assembly (3) can be unblocked by using the backwash airflow.

2. The water primary filtration device for waterworks according to claim 1, characterized in that: The branch filter tube body (12) comprises a special-shaped tube cavity (121), a first inlet tube cavity (122), a second outlet tube cavity (123) and a third common tube cavity (124), wherein: The first inlet tube cavity (122), the special-shaped tube cavity (121), the third common tube cavity (124) and the second outlet tube cavity (123) are connected in sequence to form a water flow tube cavity, and the special-shaped tube cavity (121) and the third common tube cavity (124) can cooperate with the backwash filter assembly (3) to construct a backwash cavity that can be selectively isolated from the water flow tube cavity.

3. The water primary filtration device for waterworks according to claim 2, characterized in that: The backwash filter assembly (3) comprises a filter plate (31), an air inlet pipe (32), an air outlet pipe (33), a rotating baffle (34), an outlet valve (35), a hydraulic limit column (36) and an air blowing unit (37), wherein: The filter plate (31) is horizontally embedded in the third common tube cavity (124), and the air inlet pipe (32) is connected to the tube wall of the third common tube cavity (124) downstream of the filter plate (31); The wall of the special-shaped tube cavity (121) away from the air inlet pipe (32) is connected to the air outlet pipe (33), and the inner wall of the special-shaped tube cavity (121) close to the air outlet pipe (33) is rotatably connected to a valve capable of rotating the air outlet pipe (33). The rotating baffle (34) is used to seal the pipe opening.

4. The water primary filtration device for waterworks according to claim 3, characterized in that: The hydraulic limit column (36) is hinged on the lower surface of the rotating baffle (34), and one end of the hydraulic limit column (36) away from the rotating baffle (34) is hinged on the inner wall of the outlet pipe (33), so that the hydraulic limit column (36) can drive the rotating baffle (34) to rotate in an adjustable telescopic manner to block the inlet pipe opening of the special-shaped cavity (121).

5. The water primary filtration device for waterworks according to claim 4, characterized in that: The outlet end of the third common lumen (124) is also provided with the outlet valve (35) capable of adjustable sealing thereof; The air blowing unit (37) for directionally inputting high-pressure dredging airflow is arranged in the air inlet pipe (32).

6. The water primary filtration device for waterworks according to claim 5, characterized in that: A stepped annular groove (1211) is provided on the wall of the special-shaped tube cavity (121), and the rotating baffle (34) is rotatably connected to the step edge of the stepped annular groove (1211), so that the rotating baffle (34) can be adjusted to fill and shield the groove cavity defined by the stepped annular groove (1211) in a manner that the plate body thereof can fit with the stepped annular groove (1211); The air outlet pipe (33) is communicated with the inner chamber of the special-shaped tube cavity (121) by penetrating the groove bottom surface of the stepped annular groove (1211).

7. The water primary filtration device for a waterworks according to claim 6, characterized in that: The inlet side of the special-shaped tubular cavity (121) is also provided with a close-fitting step (1212) that can match the plate body contour of the rotating baffle (34), so that the rotating baffle (34) rotates clockwise under the drive of the hydraulic limit column (36) and abuts against the close-fitting step (1212), thereby adjusting the inlet of the special-shaped tubular cavity (121) to block.

8. The water primary filtration device for waterworks according to claim 7, characterized in that: A sealing strip (341) matching the close-fitting step (1212) is provided on the upper plate surface of the rotating baffle plate (34); An annular sealing rubber strip (342) that can match the annular surface of the stepped annular groove (1211) is provided on the lower plate surface of the rotating baffle plate (34).

9. The water primary filtration device for a waterworks according to claim 8, characterized in that: An arc-shaped protrusion (343) is also provided on the upper plate surface of the rotating baffle (34).

10. The water primary filtration device for a waterworks according to claim 9, characterized in that: A water inlet valve (4) is also provided on the input pipe body (11) of the primary screening pipe body (1).

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