Municipal water plant water body pretreatment device

Abstract

The water body pretreatment device for the municipal water plant comprises the surrounding shell which is connected to the pretreatment pipe in a bypass mode and matched with the pretreatment pipe and the filter plate assembly arranged at the joint of the surrounding shell and the pretreatment pipe, the longitudinal section of the surrounding shell on the pretreatment pipe is in a circular arc shape, and the end, away from the pretreatment pipe, of the surrounding shell is communicated with the blow-off pipe; a blow-off valve is arranged on the blow-off pipe, the filter plate assembly comprises a shaft and filter plates connected to the shaft, the shaft is rotatably connected to the surrounding shell and is perpendicular to the pretreatment pipe and passes through the circle center of the surrounding shell, the multiple filter plates are evenly distributed around the shaft, and the filter plate assembly is provided with a filter station and a back-flushing station; the end of the shaft is in dynamic sealing connection with the inner wall of the pretreatment pipe when the shaft is located at the filter station, the end of the shaft is in dynamic sealing connection with the inner wall of the surrounding shell when the shaft is located at the back-flushing station, and when the filter plate at the filter station is blocked, the filter plate can be switched between the filter station and the back-flushing station through rotation of the shaft, so that the filter plate is replaced, a blow-down valve is opened, and back-flushing cleaning of the filter plate can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of water pretreatment technology, specifically to a water pretreatment device for municipal water plants. Background Technology

[0002] Pretreatment is the first barrier in water purification, aiming to remove large particles, colloids, organic matter, and microorganisms from raw water, reduce the load on subsequent processes, and improve the stability of effluent. Its main objectives include:

[0003] Physical interception: Removes visible impurities such as suspended solids, silt, and algae.

[0004] Chemical regulation: decomposing or transforming soluble pollutants (such as humic acid and heavy metal ions).

[0005] Bioinhibition: Controlling the growth of microorganisms and preventing pipe blockage and biofilm formation.

[0006] Physical interception mainly relies on grids and screens to intercept large floating objects, algae, and small particles (such as sand) in the water. During use, the screens are prone to clogging. After clogging, the machine needs to be stopped and the screens removed, and then cleaned by manual flushing. This is inconvenient, time-consuming, and inefficient. At the same time, the screens are used in a closed environment, making it difficult to judge the degree of clogging, which can easily lead to premature removal or untimely cleaning. Utility Model Content

[0007] The purpose of this invention is to overcome one or more shortcomings in the prior art and provide a water pretreatment device for municipal water plants.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is a municipal water plant water pretreatment device for filtering sewage flowing from front to back in a pretreatment pipe. The municipal water plant water pretreatment device includes:

[0009] A casing that is adjacent to the pretreatment tube and matches the pretreatment tube;

[0010] A filter plate assembly located at the connection between the enclosure and the pretreatment pipe;

[0011] The enclosure is arc-shaped in the longitudinal section of the pretreatment pipe. The end of the enclosure away from the pretreatment pipe is connected to a drain pipe with a drain valve. The filter plate assembly includes a shaft and filter plates connected to the shaft. The shaft is rotatably connected to the enclosure, perpendicular to the pretreatment pipe and passing through the center of the enclosure. Multiple filter plates are evenly distributed around the shaft. Each filter plate has a filtration station and a backwash station. When the filter plate is in the filtration station, the end of the filter plate is dynamically sealed to the inner wall of the pretreatment pipe. When the filter plate is in the backwash station, the end of the filter plate is dynamically sealed to the inner wall of the enclosure. When the shaft rotates, the filter plate changes between the filtration station and the backwash station.

[0012] Preferably, there are four filter plates and the shaft rotates at a single angle of 90°; or, there are three filter plates and the shaft rotates at a single angle of 120°.

[0013] More preferably, the municipal water plant water pretreatment device further includes a servo motor for driving the shaft to rotate. The servo motor balances the force exerted by the sewage on the filter plate at the filtration station through negative feedback. When the negative feedback current of the servo motor exceeds a set value, the servo motor drives the shaft to rotate once.

[0014] Preferably, two active flushing mechanisms are symmetrically arranged on the front and rear sides of the enclosure. Each active flushing mechanism includes an insert plate that can be plugged into the enclosure. The insert plate has a flushing position and a clearance position. When the insert plate is in the flushing position, it is inserted into the enclosure, and the end of the insert plate abuts against the front or rear surface of the filter plate located in the filtration position, thus enclosing the filter plate located in the backflushing position within the enclosure. When the insert plate is in the clearance position, it is pulled out of the enclosure, and the end of the insert plate is flush with the inner wall of the enclosure to avoid the filter plate.

[0015] More preferably, the insert plate is hollow to form a cavity, and multiple spray nozzles are evenly distributed on the surface of the insert plate away from the pretreatment tube. The spray nozzles are connected to the cavity. The insert plate is also provided with a connector for supplying high-pressure water into the cavity. The active flushing mechanism also includes a high-pressure pump connected to the connector via a hose.

[0016] More preferably, the high-pressure pump draws water from the outlet of the pretreatment pipe and pumps it into the cavity through the connector.

[0017] More preferably, the end of the insert plate is provided with a sealing strip, so that when the insert plate is in the flushing position, the insert plate is sealed to the filter plate located in the filtration position.

[0018] More preferably, the active flushing mechanism further includes an electric push rod for driving the insertion and removal of the insert plate.

[0019] Preferably, the municipal water plant water pretreatment device further includes an active sealing mechanism for isolating the filter plate assembly. The active sealing mechanism includes a sealing plate that is pluggably disposed on the pretreatment pipe and located on the front and rear sides of the enclosure. When the sealing plate is inserted to its limit position, the sealing plate cuts off the pretreatment pipe. The opposing surfaces of the sealing plate, the inner wall of the pretreatment pipe, and the enclosure form a sealed cavity.

[0020] More preferably, the active sealing mechanism further includes a bracket connected to the two sealing plates protruding from the ends of the pretreatment tube, and a hydraulic cylinder for driving the bracket to move.

[0021] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] The municipal water pretreatment device provided by this utility model includes a casing that is connected to and matches the pretreatment pipe and a filter plate assembly located at the connection between the casing and the pretreatment pipe. The casing is arc-shaped in the longitudinal section of the pretreatment pipe, and a sewage pipe is connected to its end away from the pretreatment pipe. A sewage valve is installed on the sewage pipe. The filter plate assembly includes a shaft and filter plates connected to the shaft. The shaft is rotatably connected to the casing, perpendicular to the pretreatment pipe and passing through the center of the casing. Multiple filter plates are evenly distributed around the shaft, and each filter plate has a filtration position and a backwash position. When the filter plate is in the filtration position, its end is dynamically sealed to the inner wall of the pretreatment pipe. When the filter plate is in the backwash position, its end is dynamically sealed to the inner wall of the casing. When the filter plate in the filtration position is blocked, the rotation of the shaft allows the filter plate to switch between the filtration position and the backwash position, thereby replacing the filter plate. Then, opening the sewage valve allows the filter plate to be backwashed and cleaned. Attached Figure Description

[0023] Figure 1 This is a longitudinal sectional view of Embodiment 1 of the present invention.

[0024] Figure 2 This is a longitudinal sectional view of Embodiment 2 of the present invention.

[0025] Figure 3 yes Figure 2 A three-dimensional schematic diagram of the middle insert plate.

[0026] Figure 4 This is a longitudinal sectional view of Embodiment 3 of this utility model.

[0027] The components are as follows: 1. Pretreatment pipe; 10. Enclosure; 11. Drain pipe; 12. Drain valve; 20. Filter plate assembly; 21. Shaft; 22. Filter plate; 221. Filtration station; 222. Backflushing station; 30. Active flushing mechanism; 31. Insert plate; 311. Injection port; 312. Connector; 313. Sealing strip; 32. High-pressure pump; 33. Electric push rod; 40. Active sealing mechanism; 41. Sealing plate; 42. Support; 43. Hydraulic cylinder. Detailed Implementation

[0028] Example 1

[0029] like Figure 1 As shown, the municipal water plant pretreatment device provided by this utility model is used to filter sewage flowing from front to back in a pretreatment pipe 1. The municipal water plant pretreatment device includes: a casing 10 connected to the pretreatment pipe 1, and a filter plate assembly 20 located at the connection between the casing 10 and the pretreatment pipe 1. The pretreatment pipe 1 is a square or round pipe, extending horizontally from front to back. The casing 10 is connected to and communicates with the bottom of the pretreatment pipe 1. The casing 10 is an arc-shaped or circular casing, with an arc shape in the longitudinal section of the pretreatment pipe 1. A sewage discharge pipe 11 is connected to the end of the casing 10 away from the pretreatment pipe 1, and a sewage discharge valve 12 is provided on the sewage discharge pipe 11. The filter plate assembly 20 includes a shaft 21 and filter plates 22 connected to the shaft 21. The shaft 21 is rotatably connected to the casing 10. Shaft 21 extends horizontally in the front-to-back direction, is perpendicular to the pretreatment pipe 1 and passes through the center of the casing 10. Filter plates 22 are provided with filter holes, the diameter of which is designed as needed, preferably 1-5mm. There are four filter plates 22 evenly distributed around shaft 21. Filter plates 22 have a filtration station 221 and a backwash station 222. When filter plates 22 are in filtration station 221, the end of filter plates 22 is dynamically sealed to the inner wall of the pretreatment pipe 1, and the sewage in the pretreatment pipe 1 can pass through filter plates 22 from front to back to achieve filtration. When filter plates 22 are in backwash station 222, the end of filter plates 22 is dynamically sealed to the inner wall of the casing 10. The angle of single rotation of shaft 21 is 90°. During a single rotation of shaft 21, filter plates 22 change between filtration station 221 and backwash station 222.

[0030] The advantage of this setup is that when the filter plate 22 at the filtration station 221 becomes clogged, the rotation of the shaft 21 can move the filter plate 22 to the backwash station 222. Then, by opening the drain valve 12, the water in the pretreatment pipe 1 located in front of and behind the filtration station 221 can flush the filter plate 22 located at the backwash station 222, thus achieving backwash cleaning of the filter plate 22. At the same time, driven by the shaft 21, the clean filter plate 22 originally located at the backwash station 222 is moved to the filtration station, thus achieving the replacement of the filter plate 22.

[0031] In this embodiment, the housing 10 is matched with the pretreatment tube 1. This matching means that when the shaft 21 rotates, the filter plate 22 can smoothly switch between the filtration station 221 and the backwash station 222. Specifically, in this embodiment, this matching means that the straight-line distance between the lowest point of the inner wall of the housing 10 and the highest point of the inner wall of the pretreatment tube 1 is twice the length of the filter plate 22 in the vertical direction plus the diameter of the shaft 21.

[0032] The following describes the usage process of this implementation:

[0033] After water is drawn from the water source, large floating objects are first intercepted and filtered using a grid. Then, the water is discharged into the pretreatment pipe 1. When the water passes through the top filter plate 22 (the filter plate 22 in the filtration station 221), the filter plate 22 intercepts and filters algae and small particles in the water. The water then flows through the pretreatment pipe 1 into the subsequent treatment section for further treatment. When the filter plate 22 becomes clogged, the shaft 21 is driven to rotate 90 degrees clockwise, causing the positions of the four filter plates 22 to rotate. Then, the drain valve 12 is opened, allowing a portion of the water in the pretreatment pipe 1 to flow out through the drain pipe 11. This allows the water to backwash the horizontally placed filter plate 22 (the filter plate 22 in the backwash station 222), flushing out the debris that clogs the filter plate 22. The flushed debris is then discharged through the drain pipe 11 with the water flow, achieving backwash cleaning.

[0034] Example 2

[0035] like Figure 2 and 3 As shown, Embodiment 2 is basically the same as Embodiment 1, except that in Embodiment 2, two active flushing mechanisms 30 are symmetrically arranged on the front and rear sides of the casing 10. The active flushing mechanism 30 includes a pluggable plate 31 inserted into the casing 10. The pluggable plate 31 has a flushing position and a clearance position. When the pluggable plate 31 is in the flushing position, the pluggable plate 31 is inserted into the casing 10, and the end of the pluggable plate 31 abuts against the front or rear surface of the filter plate 22 located in the filtration position 221, thus enclosing the filter plate 22 located in the backflushing position 222 inside the casing 10. When the pluggable plate 31 is in the clearance position, the pluggable plate 31 is pulled out of the casing 10, and the end of the pluggable plate 31 is flush with the inner wall of the casing 10 to avoid the rotation of the filter plate 22.

[0036] In this embodiment, the insert plate 31 is hollow to form a cavity. Multiple spray nozzles 311 are evenly distributed on the surface of the insert plate 31 away from the pretreatment pipe 1. The spray nozzles 311 are connected to the cavity. The insert plate 31 is also provided with a connector 312 for supplying high-pressure water into the cavity. The active flushing mechanism also includes a high-pressure pump 32 connected to the connector 312 through a hose. The high-pressure pump 32 is used to pump clean water into the cavity. In order to achieve water saving, in other embodiments, the high-pressure pump 32 directly draws water from the outlet of the pretreatment pipe 1 and pumps it into the cavity through the connector 312.

[0037] To improve the sealing effect, in this embodiment, a sealing ring is used to seal the connection between the insert plate 31 and the casing 10 to prevent water leakage. At the same time, a sealing strip 313 is provided at the end of the insert plate 31. When the insert plate 31 is in the flushing position, the insert plate 31 is sealed to the filter plate 22 located in the filtration position 221. At this time, the drain valve 12 is opened, and clean water is pumped in by the high-pressure pump 32 to backwash and clean the filter plate 22 located below the insert plate 31 (in the backwash position 222).

[0038] To facilitate the driving of the insert plate 31, in this embodiment, the active flushing mechanism 30 also includes an electric push rod 33 for driving the insert plate 31 to be inserted or removed.

[0039] In this embodiment, the municipal water plant water pretreatment device also includes a servo motor (not shown in the figure) for driving the shaft 21 to rotate. The servo motor balances the force applied by the sewage to the filter plate 22 at the filtration station 221 through negative feedback. When the negative feedback current of the servo motor exceeds the set value, the servo motor rotates, driving the shaft 21 to rotate once. The advantage of this setting is that it can both drive the shaft 21 to rotate using the servo motor and detect the degree of blockage of the filter plate 22 at the filtration station 221, so as to replace and backwash the filter plate 22 in a timely manner.

[0040] In use, after the filter plate 22 rotates 90 degrees, the electric push rod 33 is activated to move the insert plate 31 into the housing 10, so that the end of the insert plate 31 presses against the upright filter plate 22 (the filter plate 22 in the filtration station 221). Then, external high-pressure water is sent into the cavity inside the insert plate 31 through the connector 312. Finally, the high-pressure water is sprayed out from the spray nozzle 311 and shot towards the filter plate 22 below to rinse the filter plate 22. The wastewater generated from rinsing flows out from the drain pipe 11. This method of use is suitable when the water pressure in the pretreatment pipe 1 is not high enough. In addition, since the insert plate 31 blocks the top of the horizontally placed filter plate 22, the impurities in the water flow transported in the pretreatment pipe 1 are not likely to contaminate and clog the filter plate 22 below, so that it can be used in the next rotation, thereby extending the usable time of the filter plate 22 and reducing the frequency of rotation.

[0041] Example 3

[0042] like Figure 4 As shown, Embodiment 3 is basically the same as Embodiment 2, except that in Embodiment 3, the municipal water plant water pretreatment device further includes an active sealing mechanism 40 for isolating the filter plate assembly 20. The active sealing mechanism 40 includes a sealing plate 41 that is pluggably mounted on the pretreatment pipe 1 and located on the front and rear sides of the enclosure 10. The sealing plate 41 is dynamically sealed to the pretreatment pipe 1. When the sealing plate 41 is inserted downward to the limit position, the sealing plate 41 cuts off the pretreatment pipe 1. The surfaces of the opposite sides of the sealing plate 41, the inner wall of the pretreatment pipe 1, and the enclosure 10 form a sealed cavity to facilitate the rotation of the shaft 21 and the backwash cleaning operation of the active flushing mechanism 30.

[0043] To achieve synchronous sealing, in this embodiment, the active sealing mechanism 40 also includes a bracket 42 connected to the two sealing plates 41 protruding from the end of the pretreatment tube 1, and a hydraulic cylinder 43 for driving the bracket 42 to move. The output shaft of the hydraulic cylinder 43 is connected to the bracket 42, and the outer shell of the hydraulic cylinder 43 is fixedly connected to the outer wall of the pretreatment tube 1.

[0044] In use, the hydraulic cylinder 43 is activated, extending its output shaft, which in turn drives the bracket 42 to move the two sealing plates 41 into the pretreatment pipe 1 until the bottom of the sealing plates 41 is in close contact with the inner wall of the pretreatment pipe 1, sealing and isolating the installation position of the filter plate 22 in the pretreatment pipe 1. Then, the drain valve 12 is opened to drain the water. At the same time, the position of the filter plate 22 can be rotated. During the rotation, the water flow on the inlet side of the pretreatment pipe 1 cannot flow, preventing unfiltered water from flowing into the later section. When the active flushing mechanism 30 is working, the water on the inlet and outlet sides of the pretreatment pipe 1 will not be discharged through the drain pipe 11, reducing water waste.

[0045] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A municipal waterworks water body pretreatment device for filtering sewage flowing from front to back in a pretreatment pipe, the municipal waterworks water body pretreatment device comprising: a shell matched with the pretreatment pipe and connected to the pretreatment pipe; a filter plate assembly arranged at the connection between the shell and the pretreatment pipe; characterized in that: the shell is in the shape of a circular arc in the longitudinal section of the pretreatment pipe, an end of the shell away from the pretreatment pipe is connected with a blowdown pipe, the blowdown pipe is provided with a blowdown valve, the filter plate assembly comprises a shaft and filter plates connected to the shaft, the shaft is rotatably connected to the shell, the shaft is perpendicular to the pretreatment pipe and passes through the center of the shell, the filter plates are arranged around the shaft, the filter plates have filtering positions and backwashing positions, when the filter plates are in the filtering positions, the end of the filter plates is in dynamic sealing connection with the inner wall of the pretreatment pipe, when the filter plates are in the backwashing positions, the end of the filter plates is in dynamic sealing connection with the inner wall of the shell, when the shaft rotates, the filter plates change between the filtering positions and the backwashing positions.

2. The municipal water plant water body pretreatment device of claim 1, wherein: The filter plates are four, and the angle of single rotation of the shaft is 90°, or the filter plates are three, and the angle of single rotation of the shaft is 120°.

3. The municipal water plant water body pretreatment device of claim 2, wherein: The municipal waterworks water body pretreatment device further comprises a servo motor for driving the shaft to rotate, the servo motor balances the force applied by the sewage on the filter plates at the filtering positions through negative feedback, and when the negative feedback current of the servo motor exceeds a set value, the servo motor drives the shaft to rotate once.

4. The municipal water plant water body pretreatment device of claim 1, wherein: Two active flushing mechanisms are symmetrically arranged on the front and back of the shell, the active flushing mechanism comprises a plug plate pluggably inserted into the shell, the plug plate has a flushing position and an avoiding position, when the plug plate is in the flushing position, the plug plate is inserted into the shell, the end of the plug plate abuts against the front surface or the back surface of the filter plate at the filtering position, and the filter plate at the backwashing position is enclosed in the shell, when the plug plate is in the avoiding position, the plug plate is pulled out of the shell, and the end of the plug plate is flush with the inner wall of the shell to avoid the filter plate.

5. The municipal water plant water body pretreatment device of claim 4, wherein: The plug plate is internally hollow to form a cavity, the surface of the plug plate away from the pretreatment pipe is uniformly provided with a plurality of injection ports, the injection ports are in communication with the cavity, the plug plate is further provided with a connector for supplying high-pressure water into the cavity, and the active flushing mechanism further comprises a high-pressure pump connected to the connector through a hose.

6. The municipal water plant water body pretreatment device of claim 5, wherein: The high-pressure pump takes water from the water outlet of the pretreatment pipe and pumps the water into the cavity through the connector.

7. The municipal water plant water body pretreatment device of claim 4, wherein: The end of the plug plate is provided with a sealing strip, and when the plug plate is in the flushing position, the plug plate is in sealing connection with the filter plate at the filtering position.

8. The municipal water plant water body pretreatment device of claim 4, wherein: The active flushing mechanism further comprises an electric push rod for driving the plug plate to be inserted and pulled out.

9. The municipal water plant water body pretreatment device of claim 1, wherein: The municipal water plant water body pretreatment device further comprises a positive blocking mechanism for blocking the filter plate assembly, the positive blocking mechanism comprising blocking plates which are pluggably arranged on the pretreatment pipe and located at the front side and the rear side of the enclosure, when the blocking plates are inserted to the limit position, the blocking plates cut off the pretreatment pipe, the surfaces of the opposite sides of the blocking plates, the inner wall of the pretreatment pipe and the enclosure form a closed cavity.

10. The municipal water plant water body pretreatment device of claim 9, wherein: The positive blocking mechanism further comprises a bracket connected to the blocking plates which protrude from the end of the pretreatment pipe, and a hydraulic cylinder for driving the movement of the bracket.

Images