Water quality purification equipment for hydraulic engineering

Abstract

The utility model relates to the technical field of hydraulic engineering, in particular to water quality purification equipment for hydraulic engineering. Comprising a pretreatment assembly, a grating assembly, a purification assembly, a sand filtering assembly and a filtering assembly, the pretreatment assembly comprises a pretreatment box, the grating assembly comprises a grating plate and a sealing plate, the purification assembly comprises a purification box, a backflushing pipe, a water inlet pipe and a first water pump, and the sand filtering assembly comprises a flow guide plate and a sand filtering layer. The filtering assembly comprises a filtering box and a second water pump, the lower end of a back-flushing pipe is connected with a back-flushing spray head, a sand filtering layer is filled with quartz sand, and a filtering layer is arranged on the inner side of the filtering box. After water flows into the purification box from the first water conveying pipe, the water is blocked by the flow guide plate in the falling process of the purification box, then the water continuously falls through the flow guide groove, when the water passes through the quartz sand, suspended solids and colloids are intercepted and adsorbed, and then the suspended solids and the colloids in the water are removed through the sand filtering layer.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering technology, specifically to a water purification device for water conservancy projects. Background Technology

[0002] Water conservancy projects refer to the engineering field that utilizes water resources for planning, design, construction, and management to meet the needs of human production, life, and environmental protection. The main goal of water conservancy projects is to efficiently utilize water resources, provide reliable water supply, drainage, and irrigation services, and simultaneously achieve flood control, navigation, and power generation. Water purification refers to the process of removing or transforming impurities, harmful substances, and pollutants in water to achieve safe, clean, and healthy water quality requirements.

[0003] Existing water purification equipment for water conservancy projects requires the use of grating plates for water pretreatment. To facilitate subsequent cleaning and maintenance of the grating plates, they are usually installed in the pretreatment tank after passing through the installation trough. However, due to the large flow rate and high velocity of the water in water conservancy projects, the long-term impact of this water on the grating plates will cause them to shake, which in turn affects the subsequent cleaning and maintenance of the grating plates. Utility Model Content

[0004] To address the above problems, the purpose of this utility model is to provide a water purification device for water conservancy projects. This device solves the problem of using grating plates for water pretreatment. To facilitate subsequent cleaning and maintenance, the grating plates are typically installed inside a pretreatment tank after passing through an installation trough. However, due to the large flow rate and high velocity of the water in water conservancy projects, the prolonged impact of this water on the grating plates causes them to shake, affecting subsequent cleaning and maintenance. As the grating plate is gradually inserted into the pretreatment tank, the connecting strip contacts the sliding plate as the grating plate descends. With the continued descent of the grating plate, the connecting strip applies pressure to the sliding plate under the action of the grating plate. Then, the compression spring contracts under the force of the sliding plate. When the bottom of the grating plate is in contact with the bottom wall of the pretreatment tank, the connecting strip simultaneously extends into the clearance groove, thus ensuring the stability of the connection between the grating plate and the pretreatment tank.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a water purification device for water conservancy projects, comprising a pretreatment component, a bar screen component, a purification component, a sand filter component, and a filtration component. The pretreatment component includes a pretreatment box; the bar screen component includes a bar screen plate and a sealing plate; the purification component includes a purification box, a backwash pipe, an inlet pipe, and a first water pump; the sand filter component includes a guide plate and a sand filter layer; and the filtration component includes a filtration box and a second water pump. The top wall of the pretreatment box has two mounting grooves, and the bottom wall of the pretreatment box has two clearance grooves. A sliding plate is provided on the inner side of each clearance groove. A baffle plate is connected to the inner wall of the pretreatment box. A connector strip is welded to the bottom of the bar screen plate. One end of the inlet pipe is connected to a diversion pipe, and the lower end of the backwash pipe is connected to a backwash nozzle. The sand filter layer is filled with quartz sand, and a filtration layer is provided on the inner side of the filtration box.

[0006] The beneficial effects of this utility model are as follows: When the grating is gradually inserted into the pretreatment box, the insert strip contacts the sliding plate as the grating descends. As the grating continues to descend, the insert strip applies pressure to the sliding plate under the action of the grating. Then, the compression spring contracts under the force of the sliding plate. When the bottom of the grating is in contact with the bottom wall of the pretreatment box, the insert strip simultaneously extends into the relief groove, thereby ensuring the stability of the connection between the grating and the pretreatment box. When the grating is lifted, the insert strip gradually moves away from the relief groove. At this time, the compression spring resets and pushes the sliding plate upward. The rise of the sliding plate is used to seal the relief groove, preventing impurities from entering the relief groove.

[0007] To allow water to flow through the filter tank into the area separated by the barrier plate and undergo sedimentation treatment:

[0008] As a further improvement to the above technical solution: a water filter tank is provided on the inner side of the upper part of the barrier plate, and the pretreatment box is divided into two areas by the barrier plate.

[0009] The beneficial effects of this improvement are as follows: as the water level rises, the water, after being blocked by the bar screen, flows through the filter tank into the area separated by the bar screen and undergoes sedimentation treatment. In this area, most of the suspended solids are removed by gravity sedimentation.

[0010] To ensure the stability of the connection between the grating and the pretreatment box, the insertion strip must extend into the clearance groove simultaneously.

[0011] As a further improvement to the above technical solution: there are two relief grooves, both located directly below the vertical direction of the mounting top groove. A compression spring is connected to the bottom of the sliding plate. The end of the compression spring away from the sliding plate is connected to the inner wall of the relief groove. The sliding plate is slidably connected to the relief groove through the compression spring. An anti-slip pad is embedded on the inner side of the upper part of the sliding plate.

[0012] The beneficial effects of this improvement are as follows: When the grating is gradually inserted into the pretreatment box, the insert strip contacts the sliding plate as the grating descends. As the grating continues to descend, the insert strip applies pressure to the sliding plate under the action of the grating. Then, the compression spring contracts under the force of the sliding plate. When the bottom of the grating is in contact with the bottom wall of the pretreatment box, the insert strip simultaneously extends into the clearance groove, thereby ensuring the stability of the connection between the grating and the pretreatment box. When the grating is lifted, the insert strip gradually moves away from the clearance groove. At this time, the compression spring resets and pushes the sliding plate upward. The rise of the sliding plate is used to seal the clearance groove, preventing impurities from entering the clearance groove.

[0013] For use in blocking and removing large particulate matter from water:

[0014] As a further improvement to the above technical solution: the grating plate is provided in two pieces, the upper two ends of the grating plate are symmetrically welded with limit plates, the top of the grating plate away from the plug strip is welded with ear plates, the top of the sealing plate is welded with ear plates, the upper two ends of the sealing plate are symmetrically welded with limit plates, and the inner side of the grating plate is provided with a grating groove.

[0015] The beneficial effects of this improvement are as follows: by setting up the grating plate, large particles of debris in the water can be blocked and removed. When the grating plate needs to be cleaned and maintained, the hook of the lifting equipment is connected to the ear plate, and then the grating plate is lifted from the pretreatment box. The sealing plate is then inserted into the installation top groove exposed after the grating plate is lifted.

[0016] In order for the first water pump to operate and for the pre-treated water to be extracted from the pre-treatment tank through the first water pipe:

[0017] As a further improvement to the above technical solution: the first water pump is installed on the top of the pretreatment tank and electrically connected to the operation panel. The output end of the first water pump is connected to a first water suction pipe. The end of the first water pump away from the first water suction pipe is connected to a first water delivery pipe. The end of the first water suction pipe away from the first water pump penetrates the top wall of the pretreatment tank and extends to the inside of the pretreatment tank. The end of the first water delivery pipe away from the first water pump penetrates the top wall of the purification tank and extends to the inside of the purification tank.

[0018] The beneficial effects of this improvement are as follows: after the water has settled, the first water pump is started. The first water pump works and extracts the settled water from the pretreatment tank through the first water pumping pipe, and then transports it to the purification tank through the first water delivery pipe.

[0019] The flushing water inside the backflushing pipe is sprayed out through the backflushing nozzles to flush the baffle plate and remove accumulated dirt.

[0020] As a further improvement to the above technical solution: the end of the inlet pipe away from the branch pipe is connected to an external water source, the end of the branch pipe away from the inlet pipe is connected to a backflushing pipe, and the end of the backflushing pipe away from the branch pipe is connected to the inner wall of the purification tank.

[0021] The beneficial effects of this improvement are as follows: when the baffle plate needs to be flushed, the external water source is turned on, and the flushing water flows from the inlet pipe into the diversion pipe and then into the backflushing pipe. The flushing water in the backflushing pipe is then sprayed out through the backflushing nozzle and used to flush the baffle plate, removing the dirt accumulated on the baffle plate.

[0022] To ensure that suspended solids and colloids are trapped and adsorbed when water passes through quartz sand:

[0023] As a further improvement to the above technical solution: a flow guide groove is provided on the inner side of the flow guide plate, and there are two sand filter layers, both of which are located below the flow guide plate.

[0024] The beneficial effects of this improvement are as follows: after the water flows into the purification tank from the first water supply pipe, the water encounters the obstruction of the guide plate during its descent in the purification tank, and then the water continues to fall through the guide channel. When the water passes through the quartz sand, suspended solids and colloids are intercepted and adsorbed, and then the suspended solids and colloids in the water are removed through the sand filter layer.

[0025] To ensure the filter layer filters the incoming water in two stages:

[0026] As a further improvement to the above technical solution: the second water pump is electrically connected to the operation panel, the output end of the second water pump is connected to a second water suction pipe, the end of the second water pump away from the second water suction pipe is connected to a second water delivery pipe, the end of the second water suction pipe away from the second water pump penetrates the wall of the purification box and extends to the inside of the purification box, the end of the second water delivery pipe away from the second water pump penetrates the top wall of the filter box and extends to the inside of the filter box, there are two filter layers, both of which are slidably connected to the inner wall of the filter box, and one end of the filter box is connected to a drain pipe.

[0027] The beneficial effects of this improvement are as follows: After the second water pump is started, it works and pressurizes the water in the purification tank and draws it into the filter tank. The filter layer performs two-layer filtration on the incoming water, and then the filtered water is discharged through the drain pipe. Attached Figure Description

[0028] Figure 1 This is a front cross-sectional view of the present invention.

[0029] Figure 2 for Figure 1 A magnified structural diagram of point A in the middle.

[0030] Figure 3This is a cross-sectional view of the pretreatment box of this utility model.

[0031] Figure 4 for Figure 3 A magnified structural diagram at point B in the middle.

[0032] Figure 5 This is a schematic diagram of the structure of the grating plate of this utility model.

[0033] Figure 6 This is a top view cross-sectional structural diagram of the purification box of this utility model.

[0034] Figure 7 This is a schematic diagram of the structure of the guide plate of this utility model.

[0035] Figure 8 This is a cross-sectional structural diagram of the sand filter layer of this utility model.

[0036] In the diagram: 1. Pretreatment assembly; 11. Pretreatment box; 12. Mounting top groove; 13. Clearance bottom groove; 14. Sliding plate; 15. Anti-slip mat; 16. Barrier plate; 17. Filter tank; 18. Compression spring; 2. Grille assembly; 21. Grille plate; 22. Connecting strip; 23. Grille channel; 24. Limiting plate; 25. Ear plate; 26. Sealing plate; 3. Purification assembly; 31. Purification box; 32. Backflushing pipe 33. Diversion pipe; 34. Inlet pipe; 35. First water pump; 36. First pumping pipe; 37. First water delivery pipe; 38. Backflush nozzle; 4. Sand filter assembly; 41. Guide plate; 42. Guide channel; 43. Sand filter layer; 44. Quartz sand; 5. Filter assembly; 51. Filter box; 52. Filter layer; 53. Second water pump; 54. Second pumping pipe; 55. Second water delivery pipe; 56. Drainage pipe. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0038] like Figure 1-8As shown, a water purification device for a water conservancy project includes a pretreatment component 1, a bar screen component 2, a purification component 3, a sand filter component 4, and a filtration component 5. The pretreatment component 1 includes a pretreatment tank 11. The bar screen component 2 includes a bar screen 21 and a sealing plate 26. The purification component 3 includes a purification tank 31, a backwash pipe 32, an inlet pipe 34, and a first water pump 35. The sand filter component 4 includes a guide plate 41 and a sand filter layer 43. The filtration component 5 includes a filtration tank 51 and a second water pump 53. The top wall of the pretreatment tank 11 has two mounting grooves 12, and the bottom wall of the pretreatment tank 11 has two clearance grooves 13. A sliding plate 14 is provided on the inner side of each clearance groove 13. The inner wall of the pretreatment tank 11 is connected to... A baffle plate 16 is connected to the bottom of the grid plate 21, and a connector strip 22 is welded to the bottom of the grid plate 21. One end of the water inlet pipe 34 is connected to a diversion pipe 33, and the lower end of the backwash pipe 32 is connected to a backwash nozzle 38. The sand filter layer 43 is filled with quartz sand 44. A filter layer 52 is provided inside the filter box 51. A water filter trough 17 is opened on the inner side of the upper part of the baffle plate 16. The pretreatment box 11 is divided into two areas by the baffle plate 16. As the water level rises, the water blocked by the grid plate 21 flows through the water filter trough 17 into the area separated by the baffle plate 16 and undergoes sedimentation treatment. In this area, most of the suspended solids are removed by gravity sedimentation. There are two bottom troughs 13, both located in the installation top trough 12. Directly below in the vertical direction, a compression spring 18 is connected to the bottom of the sliding plate 14. The end of the compression spring 18 away from the sliding plate 14 is connected to the inner wall of the clearance groove 13. The sliding plate 14 is slidably connected to the clearance groove 13 through the compression spring 18. An anti-slip pad 15 is embedded on the inner side of the upper part of the sliding plate 14. When the grating plate 21 is gradually inserted into the pretreatment box 11, the insertion strip 22 contacts the sliding plate 14 as the grating plate 21 descends. As the grating plate 21 continues to descend, the insertion strip 22 applies pressure to the sliding plate 14 under the action of the grating plate 21. Then, the compression spring 18 is compressed under the force of the sliding plate 14. When the bottom of the grating plate 21 is in contact with the bottom wall of the pretreatment box 11, the insertion strip 22... Simultaneously, it extends into the relief groove 13, thereby ensuring the stability of the connection between the grating plate 21 and the pretreatment box 11. When the grating plate 21 is lifted, the insert strip 22 gradually moves away from the relief groove 13. At this time, the compression spring 18 resets and pushes the sliding plate 14 to rise. The rise of the sliding plate 14 is used to block the relief groove 13 to prevent impurities from entering the relief groove 13. There are two grating plates 21. Limiting plates 24 are symmetrically welded at both ends of the upper part of the grating plate 21. Ear plates 25 are welded to the top of the grating plate 21 away from the insert strip 22. Ear plates 25 are welded to the top of the sealing plate 26. Limiting plates 24 are symmetrically welded to both ends of the upper part of the sealing plate 26. A grating groove 23 is opened on the inner side of the grating plate 21.The grating plate 21 is used to block and remove large particles of debris in the water. When cleaning and maintenance of the grating plate 21 is required, the lifting equipment hook is connected to the ear plate 25, and then the grating plate 21 is lifted from the pretreatment tank 11. The sealing plate 26 is inserted into the installation top groove 12 exposed after the grating plate 21 is lifted. The first water pump 35 is installed on the top of the pretreatment tank 11 and is electrically connected to the operation panel. The output end of the first water pump 35 is connected to the first water suction pipe 36. The end of the first water pump 35 away from the first water suction pipe 36 is connected to the first water delivery pipe 37. The end of the first water suction pipe 36 away from the first water pump 35 penetrates the top wall of the pretreatment tank 11 and extends to the inside of the pretreatment tank 11. The end of the inlet pipe 37 away from the first water pump 35 penetrates the top wall of the purification tank 31 and extends to the inside of the purification tank 31. After the water has settled, the first water pump 35 is started. The first water pump 35 works and draws the settled water from the pretreatment tank 11 through the first water pumping pipe 36, and then delivers it to the purification tank 31 through the first water supply pipe 37. The end of the inlet pipe 34 away from the diversion pipe 33 is connected to an external water source. The end of the diversion pipe 33 away from the inlet pipe 34 is connected to the backwash pipe 32. The end of the backwash pipe 32 away from the diversion pipe 33 is connected to the inner wall of the purification tank 31. When it is necessary to rinse the guide plate 41, the external water source is turned on, and the rinsing water is diverted from the inlet pipe 34 into the diversion pipe 33 and then flows into the backwash pipe. The backwash pipe 32 then sprays the flushing water through the backwash nozzle 38 to rinse the guide plate 41, removing the dirt accumulated on the guide plate 41. The guide plate 41 has a guide groove 42 on its inner side. There are two sand filter layers 43, both located below the guide plate 41. After the water flows into the purification tank 31 from the first water supply pipe 37, the water encounters the obstruction of the guide plate 41 during its descent into the purification tank 31. Then, the water continues to fall through the guide groove 42. When the water passes through the quartz sand 44, suspended solids and colloids are trapped and adsorbed, and then the suspended solids and colloids in the water are removed through the sand filter layer 43. The second water pump 53 is electrically connected to the operation panel, and the output end of the second water pump 53 is connected to the second water suction pipe 54. The second water pump 53 is connected to a second water supply pipe 55 at one end away from the second suction pipe 54. The end of the second suction pipe 54 away from the second water pump 53 penetrates the wall of the purification tank 31 and extends into the inner side of the purification tank 31. The end of the second water supply pipe 55 away from the second water pump 53 penetrates the top wall of the filter tank 51 and extends into the inner side of the filter tank 51. There are two filter layers 52, both slidably connected to the inner wall of the filter tank 51. One end of the filter tank 51 is connected to a discharge pipe 56. After the second water pump 53 is started, it operates and pressurizes the water in the purification tank 31, drawing it into the filter tank 51. The filter layers 52 perform two-layer filtration on the incoming water, and then the filtered water is discharged through the discharge pipe 56.

[0039] The working principle of this utility model is as follows: During use, water flows into the pretreatment tank 11. The grating plate 21 is used to block and remove large particles of debris from the water. When cleaning and maintenance of the grating plate 21 is required, the lifting equipment hook is connected to the ear plate 25, and then the grating plate 21 is lifted from the pretreatment tank 11. The sealing plate 26 is inserted into the installation top groove 12 exposed after the grating plate 21 is lifted. When the grating plate 21 is lifted, the connecting strip 22 gradually moves away from the clearance groove 13. At this time, the compression spring 18 resets and pushes the sliding plate 14 upward. The rising of the sliding plate 14 seals the clearance groove 13. To prevent impurities from entering the clearance trough 13, as the grating plate 21 is gradually inserted into the pretreatment tank 11, the connecting strip 22 contacts the sliding plate 14 during the descent of the grating plate 21. As the grating plate 21 continues to descend, the connecting strip 22 applies pressure to the sliding plate 14 under the action of the grating plate 21. Then, the compression spring 18 contracts under the force of the sliding plate 14. When the bottom of the grating plate 21 is in contact with the bottom wall of the pretreatment tank 11, the connecting strip 22 simultaneously extends into the clearance trough 13, thus ensuring the stability of the connection between the grating plate 21 and the pretreatment tank 11. As the water level rises, the water body blocked by the grating plate 21... The water flows into the area separated by the baffle plate 16 through the filter tank 17 and undergoes sedimentation treatment. In this area, most of the suspended solids are removed by gravity sedimentation. After the water has settled, the first water pump 35 is started. The first water pump 35 works and pumps the settled water from the pretreatment tank 11 through the first water pumping pipe 36, and then delivers it to the purification tank 31 through the first water supply pipe 37. When it is necessary to rinse the guide plate 41, the external water source is turned on. The rinsing water is diverted from the inlet pipe 34 to the diversion pipe 33 and then flows into the backwash pipe 32. The rinsing water in the backwash pipe 32 is then sprayed out through the backwash nozzle 38 and used to rinse the guide plate. The rinsing of 41 removes the dirt accumulated on the guide plate 41. After the water flows into the purification tank 31 from the first water supply pipe 37, the water encounters the obstruction of the guide plate 41 during its descent into the purification tank 31. Then the water continues to fall through the guide channel 42. When the water passes through the quartz sand 44, suspended solids and colloids are intercepted and adsorbed. Then, the suspended solids and colloids in the water are removed through the sand filter layer 43. After the second water pump 53 is started, the second water pump 53 works and pressurizes the water in the purification tank 31 and draws it into the filter tank 51. The filter layer 52 performs two layers of filtration on the incoming water. Then the filtered water is discharged through the discharge pipe 56.

[0040] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of this utility model, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A water purification device for a water conservancy project, comprising a pretreatment component (1), a bar screen component (2), a purification component (3), a sand filter component (4), and a filtration component (5), wherein the pretreatment component (1) comprises a pretreatment tank (11), the bar screen component (2) comprises a bar screen plate (21) and a sealing plate (26), the purification component (3) comprises a purification tank (31), a backwash pipe (32), an inlet pipe (34), and a first water pump (35), the sand filter component (4) comprises a guide plate (41) and a sand filter layer (43), and the filtration component (5) comprises a filter tank (51) and a second water pump (53), characterized in that: The pretreatment box (11) has two mounting grooves (12) on its top wall and two clearance grooves (13) on its bottom wall. A sliding plate (14) is provided on the inner side of the clearance groove (13). A baffle plate (16) is connected to the inner wall of the pretreatment box (11). A plug strip (22) is welded to the bottom of the grid plate (21). A diversion pipe (33) is connected to one end of the water inlet pipe (34). A backwash nozzle (38) is connected to the lower end of the backwash pipe (32). Quartz sand (44) is filled inside the sand filter layer (43). A filter layer (52) is provided on the inner side of the filter box (51).

2. The water purification equipment for water conservancy projects according to claim 1, characterized in that: A water filter tank (17) is provided on the inner side of the upper part of the barrier plate (16), and the pretreatment box (11) is divided into two areas by the barrier plate (16).

3. The water purification equipment for water conservancy projects according to claim 1, characterized in that: There are two relief grooves (13), both located directly below the mounting top groove (12) in the vertical direction. A compression spring (18) is connected to the bottom of the sliding plate (14). The end of the compression spring (18) away from the sliding plate (14) is connected to the inner wall of the relief groove (13). The sliding plate (14) is slidably connected to the relief groove (13) through the compression spring (18). An anti-slip pad (15) is embedded on the inner side of the upper part of the sliding plate (14).

4. The water purification equipment for water conservancy projects according to claim 1, characterized in that: Two grid plates (21) are provided. Limiting plates (24) are symmetrically welded at both ends of the upper part of the grid plate (21). Ear plates (25) are welded to the top of the grid plate (21) away from the plug strip (22). Ear plates (25) are welded to the top of the sealing plate (26). Limiting plates (24) are symmetrically welded to both ends of the upper part of the sealing plate (26). A grid groove (23) is opened on the inner side of the grid plate (21).

5. A water purification device for water conservancy projects according to claim 1, characterized in that: The first water pump (35) is installed on the top of the pretreatment tank (11) and electrically connected to the operation panel. The output end of the first water pump (35) is connected to the first water suction pipe (36). The end of the first water pump (35) away from the first water suction pipe (36) is connected to the first water delivery pipe (37). The end of the first water suction pipe (36) away from the first water pump (35) penetrates the top wall of the pretreatment tank (11) and extends to the inside of the pretreatment tank (11). The end of the first water delivery pipe (37) away from the first water pump (35) penetrates the top wall of the purification tank (31) and extends to the inside of the purification tank (31).

6. The water purification equipment for water conservancy projects according to claim 1, characterized in that: The end of the inlet pipe (34) away from the branch pipe (33) is connected to an external water source. The end of the branch pipe (33) away from the inlet pipe (34) is connected to the backflushing pipe (32). The end of the backflushing pipe (32) away from the branch pipe (33) is connected to the inner wall of the purification box (31).

7. A water purification device for water conservancy projects according to claim 1, characterized in that: The inner side of the guide plate (41) is provided with a guide groove (42), and there are two sand filter layers (43), both of which are located below the guide plate (41).

8. A water purification device for water conservancy projects according to claim 1, characterized in that: The second water pump (53) is electrically connected to the operation panel. The output end of the second water pump (53) is connected to the second water suction pipe (54). The end of the second water pump (53) away from the second water suction pipe (54) is connected to the second water delivery pipe (55). The end of the second water suction pipe (54) away from the second water pump (53) penetrates the wall of the purification box (31) and extends to the inside of the purification box (31). The end of the second water delivery pipe (55) away from the second water pump (53) penetrates the top wall of the filter box (51) and extends to the inside of the filter box (51). There are two filter layers (52), both of which are slidably connected to the inner wall of the filter box (51). One end of the filter box (51) is connected to the drain pipe (56).

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