An automatic backwash sewage filter for water supply and drainage

Abstract

The application discloses an automatic backwashing sewage filter for water supply and drainage and relates to the technical field of sewage filters. The automatic backwashing sewage filter comprises support legs, support shells fixedly connected to the support legs, top covers fixedly connected to the support shells, first sliding plates sealingly and slidingly connected to lower portions of the support shells, connecting shells rotationally connected to the first sliding plates, first filter members installed in the connecting shells, connecting rings slidingly connected to the fixed shells, second filter members installed in the connecting rings and first push rods fixedly connected between the support shells and the first sliding plates. The automatic backwashing sewage filter adjusts the positions of the first sliding plates and the first filter members by means of the two first push rods, so that sewage can pass through the second filter members when the filtering efficiency of the first filter members is reduced, the pressure of the sewage in the first filter members and the second filter members is reduced, and the first filter members and the second filter members are prevented from being deformed due to excessively high sewage pressure in the first filter members and the second filter members.

Description

Technical Field

[0001] This invention relates to the field of sewage filter technology, and more particularly to an automatic backwashing sewage filter for water supply and drainage. Background Technology

[0002] Water supply and drainage systems are widely used in urban construction and residents' lives, playing an important role in urban development and people's welfare. During the sewage discharge process, water supply and drainage systems require filters to remove impurities from the sewage so that it meets discharge standards.

[0003] In existing wastewater filters, the filter screen filters particulate impurities in the wastewater. Most impurities adhere to the filter screen, while a small portion embeds into the filter pores, severely affecting the filtration speed. Backwashing can only remove impurities attached to the filter screen, but it is difficult to clean the impurities embedded in the filter screen. When the filtration speed of the filter screen decreases, the inlet and outlet speeds of the filter become mismatched, causing the pressure on the filter side of the filter screen to gradually increase. The increased wastewater pressure impacts the filter screen, causing the filter pores to deform. Some impurities can then pass through the deformed filter pores, resulting in a reduction in the filtration effect on particulate impurities in the wastewater. Summary of the Invention

[0004] This invention provides an automatic backwashing sewage filter for water supply and drainage, overcoming the aforementioned drawbacks of existing filters.

[0005] The technical solution of this invention is as follows: an automatic backwashing sewage filter for water supply and drainage, comprising a support leg, a support shell fixedly connected to the support leg, a top cover fixedly connected to the support shell, a control box fixedly connected to the support shell, an outlet pipe fixedly connected and connected to the side of the support shell near the support leg, a fixing shell fixedly connected to the lower side of the top cover, an inlet pipe extending through and fixedly connected to the fixing shell on the side of the support shell away from the support leg, an electric actuator fixedly connected to the support shell, a pressure detector installed on a delivery pipe connected to the inlet pipe, and a sealed and slidably connected lower part of the support shell. The system includes a first sliding plate, a connecting shell rotatably connected to the first sliding plate, a first filter element mounted on the connecting shell, a connecting ring slidably connected to a fixed shell, a second filter element mounted on the connecting ring, the second filter element being located outside the first filter element, a sealing ring slidably fitted to the upper part of the first filter element, a first push rod with a telescopic end fixed to the first sliding plate fixed to the supporting shell, an auxiliary backlash mechanism provided between the supporting shell and the fixed shell, and an electric actuator, a pressure detector, and the first push rod all electrically connected to the control box.

[0006] Furthermore, both the first filter element and the second filter element are cylindrical, and both the first filter element and the second filter element are provided with equally spaced through holes. Filter screens are installed in the through holes of the first filter element and the second filter element, and the inner walls of the first filter element and the second filter element are both made of smooth surfaces.

[0007] Furthermore, the width of the sealing ring is greater than the width between adjacent through holes on the upper and lower sides of the second filter element, which is used to increase the sealing performance between the second filter element and the sealing ring.

[0008] Furthermore, the auxiliary recoil mechanism includes a fixed ring, which is fixedly connected between the support shell and the fixed shell. A compression block is sealed and slidably connected between the support shell and the fixed shell. The compression block is located below the fixed ring. A second push rod electrically connected to the control box is fixedly connected to the fixed ring. The telescopic end of the second push rod passes through the fixed ring and is fixedly connected to the compression block. The second push rod passes through the top cover, and the top cover is fixedly connected to the second push rod.

[0009] Furthermore, it also includes a buffer mechanism disposed on the fixed shell. The buffer mechanism is used to buffer pressure fluctuations of sewage. The buffer mechanism includes a fixed plate, which is fixed to the side of the fixed shell away from the connecting ring. The fixed shell is sealed and slidably connected to a second sliding plate, which is located below the fixed plate. A spring is fixed between the fixed plate and the second sliding plate. The second sliding plate is fixed to a first connecting rod that is fixed to the connecting ring. The top cover is provided with a limiting component for limiting the movement of the second sliding plate.

[0010] Furthermore, the limiting component includes a sliding rod, which is fixedly connected to the second sliding plate. The sliding rod slides in cooperation with the fixed plate and the top cover. A limiting block is fixedly connected to one end of the sliding rod away from the second sliding plate. The limiting block is provided with a groove. The top cover is rotatably connected to a limiting plate, which is provided with a groove that cooperates with the limiting block. An arc-shaped rack is fixedly connected to one side of the limiting plate. The top cover is fixedly connected to a first motor electrically connected to the control box via a mounting plate. The output shaft of the first motor is fixedly connected to a first gear that meshes with the arc-shaped rack.

[0011] Furthermore, the groove width of the limiting block is smaller than the groove width of the limiting plate, and inclined surfaces are provided on both sides of the groove of the limiting block to facilitate the cooperation between the limiting block and the limiting plate.

[0012] Furthermore, it also includes a slag discharge mechanism for periodically discharging filter slag. The slag discharge mechanism is disposed on the connecting shell and includes a first toothed ring fixedly connected to the connecting shell. A first sliding plate is fixedly connected to a second motor electrically connected to the control box via a mounting base. The output shaft of the second motor is fixedly connected to a second gear meshing with the first toothed ring. A first slag discharge pipe is fixedly connected to the connecting shell via a connector. The central axis of the first slag discharge pipe coincides with the central axis of the connecting shell. A rotating sleeve is sealed and rotatably connected between the connecting shell and the first slag discharge pipe. A second toothed ring is fixedly connected to the outer side of the rotating sleeve. A third motor electrically connected to the control box is fixedly connected to the first slag discharge pipe via a mounting base. The output shaft of the third motor is fixedly connected to a third gear meshing with the second toothed ring. A sealing component is provided between the connecting shell and the rotating sleeve to isolate the accumulated filter slag.

[0013] Furthermore, the sealing assembly includes a sealing plate, which is fixed to the inner wall of the connecting shell. A rotating plate is rotatably connected to the side of the sealing plate near the rotating sleeve. Both the sealing plate and the rotating plate are provided with circumferentially spaced through holes. A second connecting rod is fixed to the rotating plate. The second connecting rod is fixed to the rotating sleeve through a mounting plate. The first slag discharge pipe is fixed to and connected to a first solenoid valve that is electrically connected to the control box.

[0014] Furthermore, it also includes an auxiliary filtration mechanism, which is disposed within the support shell. This auxiliary filtration mechanism is used for secondary filtration of wastewater. The auxiliary filtration mechanism includes a second slag discharge pipe, which is fixedly connected to and communicates with the lower side of the first solenoid valve. The second slag discharge pipe is fixedly connected to mirror-distributed limiting rings. The mirror-distributed limiting rings are sealed to each other and rotatably connected to a rotating ring. The mirror-distributed limiting rings and the rotating ring cooperate to form a cavity. The second slag discharge pipe is provided with circumferentially spaced through holes, which communicate with the cavity formed by the mirror-distributed limiting rings and the rotating ring. The first sliding plate is fixedly connected to the rotating ring and communicates with a third slag discharge mechanism. The third slag discharge pipe is equipped with a second solenoid valve electrically connected to the control box. The fixed shell and the first sliding plate are provided with equally spaced third filter elements. The third filter elements are all located outside the second filter elements. Corrugated pipes are fixedly connected between adjacent third filter elements. The third filter elements located on the upper side are fixedly connected to the fixed shell, and the third filter elements located on the lower side are fixedly connected to the first sliding plate. The upper end of the third slag discharge pipe is located between the third filter elements and the connecting shell. The third filter elements are provided with equally spaced through holes, and filter screens are installed in the through holes of the third filter elements. Circumferentially equally spaced guide wheels are fixedly connected to the outer side of the third filter elements. The guide wheels are pressed into the inner wall of the support shell.

[0015] The present invention has at least the following beneficial effects compared to the prior art:

[0016] 1. The present invention uses two first push rods to adjust the position of the first sliding plate and the first filter element, thereby allowing sewage to pass through the second filter element when the filtration efficiency of the first filter element decreases. This reduces the pressure of sewage in the first and second filter elements, preventing excessive sewage pressure that could cause deformation of the first and second filter elements. It also reduces the frequency of cleaning the first and second filter elements.

[0017] 2. In this invention, the extrusion block is driven to move downward by the telescopic ends of the two second push rods. The extrusion block directly squeezes the filtered sewage on the upper side of the first sliding plate, increasing the pressure of the filtered sewage, thereby increasing the impact force of the filtered sewage on the first and second filter elements and improving the backwash effect on the first and second filter elements.

[0018] 3. The present invention utilizes the cooperation of the second sliding plate and the spring to buffer the pressure fluctuation of sewage, and avoids the sewage pressure from increasing suddenly and impacting the first and second filter elements outward, causing the first and second filter elements to deform.

[0019] 4. The limiting plate is used to limit the limiting block, which in turn limits the second sliding plate, so that the second sliding plate is always in a stable state during the process of filtering sewage, ensuring that the first filter element and the second filter element can stably filter sewage.

[0020] 5. The present invention uses a rotating plate and a sealing plate to separate the impurities entering the lower side of the connecting shell from the sewage on the upper side, thereby preventing the flowing sewage from impacting the settled impurities and causing the impurities to mix with the sewage again and adhere to the filter screens of the first and second filter elements.

[0021] 6. The filter screen on the third filter element filters the wastewater that has been filtered by the first and second filter elements again, thus improving the filtration effect of this filter on wastewater. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a cross-sectional view of the support shell and top cover of the present invention;

[0024] Figure 3 This is a cross-sectional view of the first filter element and the second filter element of the present invention;

[0025] Figure 4 This is a cross-sectional view of the buffer mechanism of the present invention;

[0026] Figure 5 This is a three-dimensional structural diagram of the limiting component of the present invention;

[0027] Figure 6 This is a three-dimensional structural diagram of the slag discharge mechanism of the present invention;

[0028] Figure 7 This is a cross-sectional view of the slag discharge mechanism of the present invention;

[0029] Figure 8 This is a cross-sectional view of the first slag discharge pipe and the second slag discharge pipe of the present invention.

[0030] Figure 9 This is a cross-sectional view of the auxiliary filtration mechanism of the present invention.

[0031] Labels in the diagram: 1. Support leg, 2. Support shell, 3. Top cover, 4. Control box, 5. Outlet pipe, 6. Fixed shell, 7. Inlet pipe, 8. Electric actuator, 9. Pressure detector, 10. First sliding plate, 11. Connecting shell, 12. First filter element, 13. Connecting ring, 14. Second filter element, 141. Sealing ring, 15. First push rod, 16. Fixed ring, 17. Squeezing block, 18. Second push rod, 19. Fixed plate, 20. Second sliding plate, 21. Spring, 22. First connecting rod, 23. Sliding rod, 24. Limiting block, 2 5. Limiting plate; 26. Arc-shaped rack; 27. First motor; 28. First gear; 29. ​​First gear ring; 30. Second motor; 31. Second gear; 32. First slag discharge pipe; 33. Rotating sleeve; 34. Second gear ring; 35. Third motor; 36. Third gear; 37. Sealing plate; 38. Rotating plate; 39. Second connecting rod; 40. First solenoid valve; 41. Second slag discharge pipe; 42. Limiting ring; 43. Rotating ring; 44. Third slag discharge pipe; 45. Second solenoid valve; 46. Third filter element; 47. Corrugated pipe; 48. Guide wheel. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0033] Example 1: An automatic backwashing sewage filter for water supply and drainage, combined with Figures 1-3As shown, the device includes a support leg 1, a support shell 2 bolted to the upper part of the support leg 1, a top cover 3 bolted to the top of the support shell 2, a control box 4 bolted to the front of the support shell 2 via a mounting bracket, an outlet pipe 5 bolted to and connected to the lower right side of the support shell 2, through which filtered wastewater is discharged and continues to flow to the right along a conveying pipe, a fixed shell 6 bolted to the lower inner side of the top cover 3, an inlet pipe 7 penetrating and bolted to the upper part of the support shell 2, through which wastewater flows to the left along the inlet pipe 7, entering the fixed shell 6 and flowing downwards along it, the inlet pipe 7 being bolted to and connected to the fixed shell 6, and an electric actuator 8 for monitoring the pressure difference between the outlet pipe 5 and the inlet pipe 7 bolted to the right side of the support shell 2. Actuator 8 is located between outlet pipe 5 and inlet pipe 7. A pressure detector 9 is installed on the delivery pipe connected to inlet pipe 7. The pressure detector 9 is used to detect pressure changes of sewage in the delivery pipe. The lower inner part of support shell 2 is sealed and slidably connected to a first sliding plate 10. A sealing element is installed on the outer ring surface of the first sliding plate 10 to increase the sealing between the first sliding plate 10 and the inner wall of support shell 2. The first sliding plate 10 is rotatably connected to a connecting shell 11. A valve is installed on the lower side of the connecting shell 11. A sealing element is installed between the connecting shell 11 and the first sliding plate 10 to prevent filtered sewage from leaking from the connection between the connecting shell 11 and the first sliding plate 10. A first filter element 12 is installed on the connecting shell 11. A connecting ring 13 is slidably connected to the fixed shell 6. 3. A second filter element 14 is installed, located outside the first filter element 12. Both the first and second filter elements are used to filter impurities in wastewater. Both the first and second filter elements 12 and 14 are cylindrical, and both have equally spaced through holes. Filter screens are installed inside the through holes of the first and second filter elements 12 and 14. The filter screens of the first and second filter elements 12 and 14 are not shown in the figure. Both the first and second filter elements 12 and 14 filter impurities in wastewater through the filter screens in their through holes. A sealing ring 141 that slides with the second filter element 14 is installed on the upper part of the first filter element 12. The inner walls of the second filter element 14 are all smooth to reduce the friction between the sealing ring 141 and the inner wall of the second filter element 14. The sealing ring 141 is made of elastic, friction-resistant rubber material, and its width is greater than the width between adjacent through holes in the second filter element 14 to increase the sealing performance between the second filter element 14 and the sealing ring 141. During the sliding process of the sealing ring 141 along the second filter element 14, the sealing ring 141 can ensure the sealing performance with the second filter element 14. The bottom of the support shell 2 is fixedly connected to two first push rods 15 through the mounting base. The first push rods 15 are electric push rods, and their telescopic ends are fixedly connected to the first sliding plate 10. The telescopic ends of the first push rods 15 are used to drive the first sliding plate 10 and other parts on it to move.An auxiliary recoil mechanism is provided between the supporting shell 2 and the fixed shell 6. The electric actuator 8, pressure detector 9, and first push rod 15 are all electrically connected to the control box 4.

[0034] Combination Figure 3 and Figure 4 As shown, the auxiliary backwashing mechanism includes a fixed ring 16, which is fixed between the support shell 2 and the fixed shell 6. The fixed ring 16 is sealed to both the support shell 2 and the fixed shell 6. A squeezing block 17 is slidably connected between the support shell 2 and the fixed shell 6. The squeezing block 17 is used to squeeze the filtered sewage downwards to increase the pressure of the filtered sewage and backwash the filter screens in the through holes of the first filter element 12 and the second filter element 14. The squeezing block 17 is located below the fixed ring 16. The fixed ring 16 is fixed with two second push rods 18 that are electrically connected to the control box 4. The second push rods 18 are electric push rods. The telescopic ends of the second push rods 18 pass through the fixed ring 16 and are fixed to the squeezing block 17. The two second push rods 18 are used to drive the squeezing block 17 to move, and the filtered sewage backwashes the filter screens in the through holes of the first filter element 12 and the second filter element 14. The second push rods 18 pass through the top cover 3, and the top cover 3 is fixed to the second push rods 18.

[0035] The staff fixed and connected the outlet pipe 5 and inlet pipe 7 to the sewage pipe. The staff started the filter through the control box 4. Subsequently, the sewage in the sewage pipe flowed into the fixed shell 6 through the inlet pipe 7. In the initial state, a valve was installed on the lower side of the connecting shell 11. During the sewage filtration process, the valve on the lower side of the connecting shell 11 was closed, and the connecting shell 11 was in the closed state. After the sewage was filtered by the first filter element 12 and the second filter element 14, the filtered sewage entered between the squeezing block 17 and the first sliding plate 10. The filtered sewage was discharged through the outlet pipe 5 and continued to be transported to the right along the conveying pipe. During the sewage filtration process, impurities in the sewage were filtered by the first filter element 12 and the second filter element 14. In the initial state (combined with Figure 3As shown), the second filter element 14 is fitted outside the first filter element 12. When the wastewater filtered by the first filter element 12 passes through the second filter element 14, the impurities in the wastewater have already been filtered by the first filter element 12. During the operation of this filter, the electric actuator 8 constantly detects the pressure difference between the outlet pipe 5 and the inlet pipe 7. The pressure detector 9 is used to detect pressure changes in the wastewater pipeline. As the first filter element 12 continues to filter the wastewater, the filter holes of the filter screen on the first filter element 12 will be gradually blocked by impurities, causing the wastewater pressure inside the first filter element 12 to increase. When the electric actuator 8 detects the pressure difference between the outlet pipe 5 and the inlet pipe 7, it will trigger the second filter element 14. When the difference between the pipes 7 reaches the set value, the electric actuator 8 transmits a signal to the control box 4. The control box 4 then activates the two first push rods 15. The telescopic ends of the two first push rods 15 drive the first sliding plate 10 and other parts thereon to move downwards. The first sliding plate 10 moves downwards along the inner wall of the support shell 2. (Each time the first filter element 12 moves downwards and stops, the through hole of the first filter element 12 connects with the adjacent through hole on the second filter element 14 to maintain normal filtration.) The first sliding plate 10 drives the first filter element 12 to move downwards through the connecting shell 11. The first filter element 12 drives the sealing ring 141 to move along the inner wall of the second filter element 14. As the wall slides downwards, the first filter element 12 moves. At this time, the through-hole of the first filter element 12 remains connected to the adjacent through-hole of the second filter element 14. Wastewater can be filtered through the through-hole at the top of the second filter element 14. This reduces the pressure of the wastewater inside the first filter element 12 and the second filter element 14, preventing excessive pressure that could cause deformation of the first and second filter elements 12 and 14. It also reduces the frequency of cleaning the first and second filter elements 12 and 14. When the first sliding plate 10 moves downwards, it increases the efficiency of the first filter element. The volume between filter element 12 and filter element 14 further reduces the internal pressure of filter element 12 and filter element 14. When the electric actuator 8 detects that the pressure of the outlet pipe 5 and the inlet pipe 7 has returned to normal, the electric actuator 8 sends a signal to the control box 4. Then the control box 4 closes the two first push rods 15 and keeps the first sliding plate 10 in this position. When the electric actuator 8 detects again that the pressure difference between the outlet pipe 5 and the inlet pipe 7 exceeds the predetermined value, the control box 4 starts the two first push rods 15 again and repeats the above operation, changing the relative position of the second filter element 14 and the first filter element 12.

[0036] As the filter continuously filters wastewater, the first sliding plate 10 and its other parts have moved to the lower side of the support shell 2. However, the first filter element 12 and the second filter element 14 are still in a mating state. At this time, a backwashing operation is required for the first filter element 12 and the second filter element 14. The operator first closes the valves connected to the outlet pipe 5 and the inlet pipe 7. Then, the operator activates the two second push rods 18 through the control box 4. The telescopic ends of the two second push rods 18 drive the squeezing block 17 to move downward. At the same time as activating the two second push rods 18, the operator opens the valve installed on the connecting shell 11, releasing the seal on the lower part of the connecting shell 11. The squeezing block 17 then moves downward. The squeezing block 17 directly squeezes the filtered wastewater on the upper side of the first sliding plate 10, increasing the pressure of the filtered wastewater on the upper side of the first sliding plate 10. The filtered wastewater backwashes the filter screens of the first filter element 12 and the second filter element 14, thereby washing away the impurities attached to the filter screens of the first filter element 12 and the second filter element 14. The impurities washed off will flow downward along the first filter element 12 and the second filter element 14 with the water flow and be discharged through the connecting shell 11. By squeezing the filtered wastewater on the upper side of the first sliding plate 10 downward by the squeezing block 17, the impact force on the backwashing of the first filter element 12 and the second filter element 14 is increased, thereby improving the backwashing effect of the first filter element 12 and the second filter element 14.

[0037] After backwashing the first filter element 12 and the second filter element 14, the operator restores the connecting shell 11 to the closed state. Simultaneously, the operator uses the control box 4 to reset the telescopic ends of the two first push rods 15 and the two second push rods 18. Then, wastewater flows into the filter along the delivery pipe. The electric actuator 8 detects the pressure difference between the outlet pipe 5 and the inlet pipe 7. If a pressure difference exists, it indicates that some filter holes in the first filter element 12 and the second filter element 14 are filled with impurities that are difficult to remove through backwashing. The control box 4 then activates the two first push rods 15 to adjust the initial position of the first sliding plate 10, thereby changing the first filter element's position. The relative positions of filter element 12 and second filter element 14 allow the first filter element 12 and part of the second filter element 14 to filter wastewater together in the initial state. Then, the above process is repeated to filter and backwash the wastewater. When the first sliding plate 10 is located at the lower part of the support shell 2 in the initial state, the filter needs to be thoroughly cleaned. The staff should replace the first filter element 12 and the second filter element 14. Through the cooperation of the first filter element 12 and the second filter element 14, the pressure of the filter can be guaranteed, and the service life and service time of the first filter element 12 and the second filter element 14 can be extended.

[0038] Example 2: Based on Example 1, combined with Figure 4 and Figure 5As shown, it also includes a buffer mechanism, which is disposed on the fixed shell 6. The buffer mechanism is used to buffer pressure fluctuations of sewage. The buffer mechanism includes a fixed plate 19, which is fixed to the upper side of the inner wall of the fixed shell 6. The fixed plate 19 and the fixed shell 6 are sealed together. The fixed shell 6 is sealed and slidably connected to a second sliding plate 20. The outer ring surface of the second sliding plate 20 is provided with a sealing element to increase the sealing performance between the second sliding plate 20 and the fixed shell 6. The second sliding plate 20 is located below the fixed plate 19. The fixed plate 19 and the second sliding plate 20 are connected... A spring 21 is fixedly connected to the second sliding plate 20. The elastic force of the spring 21 is used to buffer the upward impact force of sewage on the second sliding plate 20. The second sliding plate 20 is fixedly connected to a first connecting rod 22 that is fixedly connected to the connecting ring 13. When the second sliding plate 20 is impacted and moves upward along the fixed shell 6, the second sliding plate 20 drives the connecting ring 13 and the second filter element 14 to move upward through the first connecting rod 22, which is used to increase the filtration area of ​​the first filter element 12 and the second filter element 14 for sewage. The top cover 3 is provided with a limiting component for limiting the second sliding plate 20.

[0039] Combination Figure 5 As shown, the limiting assembly includes a sliding rod 23, which is fixedly connected to the second sliding plate 20. The sliding rod 23 passes through the fixed plate 19 and the top cover 3. The central axis of the sliding rod 23 coincides with the central axis of the second sliding plate 20, maintaining the force balance of the second sliding plate 20. The sliding rod 23 slides in cooperation with the fixed plate 19 and the top cover 3. A limiting block 24 is fixedly connected to the top of the sliding rod 23. The limiting block 24 is provided with a groove. The top cover 3 is rotatably connected to a limiting plate 25. The limiting plate 25 is in a limiting cooperation with the groove of the limiting block 24, ensuring that the second sliding plate 20 is in a stable state during the sewage filtration process. The limiting plate 25 is provided with a groove that cooperates with the limiting block 24. When the groove of the limiting block 24 corresponds vertically with the groove of the limiting plate 25, the limiting plate 25 releases its limiting function. The limiting block 24 is positioned such that when the second sliding plate 20 is impacted, the second sliding plate 20 can drive the sliding rod 23 to slide upward. The groove width of the limiting block 24 is smaller than the groove width of the limiting plate 25. Inclined surfaces are provided on both sides of the groove of the limiting block 24 to facilitate the cooperation between the limiting block 24 and the limiting plate 25, and to prevent the limiting plate 25 from colliding with the limiting block 24 during the rotation and reset process of the limiting plate 25. An arc-shaped rack 26 is fixedly connected to the outer ring surface of the limiting plate 25. The top cover 3 is fixedly connected to the first motor 27, which is electrically connected to the control box 4, through the mounting plate. The output shaft of the first motor 27 is fixedly connected to the first gear 28, which meshes with the arc-shaped rack 26. The first motor 27 drives the arc-shaped rack 26 through the first gear 28 on its output shaft to change the position of the groove of the limiting plate 25.

[0040] When pressure detector 9 detects an increase and fluctuation in sewage pressure within the delivery pipe, it transmits a signal to control box 4. Control box 4 then starts the first motor 27. The output shaft of the first motor 27 drives the first gear 28 on it to rotate. Initially, the grooves on the limiting block 24 and the limiting plate 25 are interlocked, and the limiting plate 25 and the limiting block 24 are in a limiting engagement. The first gear 28, through its engagement with the arc-shaped rack 26, changes the rotation angle of the limiting plate 25, so that the grooves on the limiting plate 25 and the grooves on the limiting block 24 are aligned. In this state, when the sewage pressure is transmitted to the fixed shell 6, the pressure inside the fixed shell 6 will increase instantaneously. The sewage impacts the second sliding plate 20 upwards. After being impacted, the second sliding plate 20 slides upwards along the fixed shell 6, and the second sliding plate 20 presses the spring 21 upwards. The spring 21 is compressed, thereby buffering the pressure fluctuation of the sewage and preventing the sewage pressure from increasing instantaneously and impacting the first filter element 12 and the second filter element 14 outwards, causing the first filter element 12 and the second filter element 14 to deform. During the upward movement of the second sliding plate 20, the second sliding plate 20 is connected to the first connecting rod. 22 drives the connecting ring 13 and the second filter element 14 to move upward synchronously, increasing the filtration area for sewage and preventing impurities already attached to the filter screen of the first filter element 12 from causing sewage to have difficulty passing through the filter screen quickly when the pressure increases. The second sliding plate 20 drives the limiting block 24 to move upward via the sliding rod 23. At this time, the limiting block 24 is misaligned with the limiting plate 25. When the sewage pressure returns to normal, the second sliding plate 20 and its parts are reset under the elastic force of the spring 21, and the second filter element 14 and the connecting ring 13 return to the buffer position. The wastewater continues to be filtered under the pre-pressure state. When the pressure detector 9 detects that the pressure in the wastewater delivery pipe has recovered, the control box 4 controls the output shaft of the first motor 27 to rotate in the reverse direction, thereby causing the limiting plate 25 to rotate in the reverse direction to the initial state. This causes the limiting block 24 and the limiting plate 25 to cooperate again, and the limiting plate 25 limits the limiting block 24, thereby limiting the second sliding plate 20. This ensures that the second sliding plate 20 remains stable during the wastewater filtration process, guaranteeing that the first filter element 12 and the second filter element 14 can stably filter the wastewater.

[0041] Example 3: Based on Example 2, combined with Figures 6-8As shown, it also includes a slag discharge mechanism for periodically discharging filter slag. The slag discharge mechanism is located on the connecting shell 11 and includes a first gear ring 29, which is fixed to the connecting shell 11 and located below the first sliding plate 10. The first sliding plate 10 is fixed to a second motor 30 electrically connected to the control box 4 via a mounting base. The output shaft of the second motor 30 is fixed to a second gear 31 that meshes with the first gear ring 29. The second motor 30 is a reciprocating motor, and its output shaft drives the second gear 31 to reciprocate. The second gear 31 drives the first gear ring 29, causing the sedimented impurities to move downwards along the connecting shell 11. The connecting shell 11 is fixed to a first slag discharge pipe 32 via a connector. The central axis of the first slag discharge pipe 32 is perpendicular to the connecting shell 11. The central axes coincide, facilitating the discharge of impurities carried by the sewage during backwashing. A rotating sleeve 33 is sealed and rotatably connected between the connecting shell 11 and the first slag discharge pipe 32. Sealing elements are provided on both the upper and lower sides of the rotating sleeve 33. A second toothed ring 34 is fixedly connected to the outer side of the rotating sleeve 33. A third motor 35 electrically connected to the control box 4 is fixedly connected to the first slag discharge pipe 32 through a mounting base. The third motor 35 is a servo motor. A third gear 36 meshing with the second toothed ring 34 is fixedly connected to the output shaft of the third motor 35. The output shaft of the third motor 35 drives the second toothed ring 34 through the third gear 36, causing the rotating sleeve 33 to rotate along the connecting shell 11 and the first slag discharge pipe 32. A sealing component is provided between the connecting shell 11 and the rotating sleeve 33 to isolate the accumulated filter residue.

[0042] Combination Figure 6 and Figure 7 As shown, the sealing assembly includes a sealing plate 37, which is fixed to the inner wall of the connecting shell 11. A rotating plate 38 is rotatably connected to the sealing plate 37. Both the sealing plate 37 and the rotating plate 38 are provided with circumferentially spaced through holes. When the through holes of the sealing plate 37 and the rotating plate 38 are connected, the sedimented impurities will pass through the through holes of the sealing plate 37 and the rotating plate 38. When the through holes of the sealing plate 37 and the rotating plate 38 are no longer connected, the sealing plate 37 and the rotating plate 38 cooperate to separate the sedimented impurities from the sewage to be filtered on the upper side of the sealing plate 37. A second connecting rod 39 is fixedly connected to the rotating plate 38. The second connecting rod 39 is fixedly connected to the rotating sleeve 33 through the mounting plate. The rotating sleeve 33 drives the rotating plate 38 to rotate along the sealing plate 37 through the mounting plate and the second connecting rod 39. A first solenoid valve 40, which is electrically connected to the control box 4, is fixedly connected to the first slag discharge pipe 32. During the sewage filtration process, the first solenoid valve 40 is in the closed state.

[0043] During the filtration of wastewater by the first filter element 12 and the second filter element 14, the filtered impurities settle to the top of the sealing plate 37. The control box 4 starts the third motor 35 at regular intervals. The conveying shaft of the third motor 35 drives the third gear 36 to rotate. The third gear 36 drives the second gear ring 34 to rotate the rotating sleeve 33 along the connecting shell 11 and the first slag discharge pipe 32. The rotating sleeve 33 drives the rotating plate 38 to rotate along the sealing plate 37 through the second connecting rod 39 until the through hole of the sealing plate 37 is connected to the through hole of the rotating plate 38. At this time, the settled impurities move downward through the through holes of the sealing plate 37 and the rotating plate 38. Initially, the first solenoid valve 40 is closed. The settled impurities move through the through holes of the sealing plate 37 and the rotating plate 38 to the space between the connecting shell 11, the first slag discharge pipe 32, and the rotating sleeve 33. During the above process, the control box 4 will periodically start the third motor 35. When the second motor 30 is started, the conveying shaft of the second motor 30 drives the second gear 31 to rotate reciprocally. The second gear 31 drives the first gear ring 29, thereby causing the connecting shell 11 to rotate reciprocally along the first sliding plate 10, changing the position of the through holes of the sealing plate 37 and the rotating plate 38, so that the settled impurities can move downward. Then, the control box 4 controls the output shafts of the second motor 30 and the third motor 35 and resets them, thereby resetting the connecting shell 11 and the rotating sleeve 33. After the rotating sleeve 33 is reset, the through hole of the rotating plate 38 is no longer connected to the through hole of the sealing plate 37. At this time, the rotating plate 38 and the sealing plate 37 cooperate to separate the impurities entering the lower side of the connecting shell 11 from the sewage on the upper side of the sealing plate 37, so as to prevent the flowing sewage from impacting the settled impurities, causing the impurities to mix with the sewage again and stick to the filter screens of the first filter element 12 and the second filter element 14.

[0044] When it is necessary to backwash the filter screens of the first filter element 12 and the second filter element 14, the operator starts the first solenoid valve 40 through the control box 4. First, the impurities and sewage between the connecting shell 11, the first slag discharge pipe 32 and the rotating sleeve 33 are discharged downwards simultaneously. At the same time, the operator starts the third motor 35 through the control box 4, which makes the through hole of the rotating plate 38 connect with the through hole of the sealing plate 37 again. Then, the above operation is repeated to backwash the filter screens of the first filter element 12 and the second filter element 14. The sewage and impurities from the backwash are discharged downwards through the through holes of the rotating plate 38 and the sealing plate 37. When the backwash is completed, the operator closes the first solenoid valve 40 through the control box 4 and controls the output shaft of the third motor 35 to reset and shut down.

[0045] Example 4: Based on Example 3, combined with Figure 8 and Figure 9As shown, it also includes an auxiliary filtration mechanism, which is disposed between the first sliding plate 10 and the fixed shell 6. The auxiliary filtration mechanism is used for secondary filtration of sewage. The auxiliary filtration mechanism includes a second slag discharge pipe 41, which is fixedly connected to and communicates with the lower side of the first solenoid valve 40. Two mirror-distributed limiting rings 42 are fixedly connected to the second slag discharge pipe 41. A rotating ring 43 is rotatably connected between the two limiting rings 42 and seals between them. The two limiting rings 42 and the rotating ring 43 cooperate to form a cavity. The second slag discharge pipe 41 is provided with circumferentially equally spaced passages. Wastewater in the cavity of the two limiting rings 42 and the rotating ring 43 is discharged through the through hole of the second slag discharge pipe 41. The through hole of the second slag discharge pipe 41 is connected to the cavity formed by the two limiting rings 42 and the rotating ring 43. The first sliding plate 10 is fixedly connected to the rotating ring 43 and is connected to the third slag discharge pipe 44. During the reciprocating rotation of the connecting shell 11, the rotating ring 43 rotates between the two limiting rings 42 and maintains a sealed state. The third slag discharge pipe 44 is equipped with a second solenoid valve 45 that is electrically connected to the control box 4. During the wastewater filtration process, the second solenoid valve 45 is activated. Ultimately in the closed state, the fixed shell 6 and the first sliding plate 10 are provided with equally spaced third filter elements 46. All third filter elements 46 are located outside the second filter element 14. A corrugated pipe 47 is fixedly connected between adjacent third filter elements 46. The corrugated pipe 47 is made of corrosion-resistant elastic rubber. The upper third filter element 46 is fixedly connected to the fixed shell 6, and the lower third filter element 46 is fixedly connected to the first sliding plate 10. The lower third filter element 46 is truncated cone-shaped. The upper end of the third slag discharge pipe 44 is located between the third filter element 46 and the connecting... Between the shells 11, the third filter element 46 is provided with equally spaced through holes, and a filter screen is installed in the through holes of the third filter element 46. The filter screen of the third filter element 46 is not shown in detail in the attached drawings. Three circumferentially equally spaced guide wheels 48 are fixed to the outside of the third filter element 46. The guide wheels 48 are pressed and engaged with the inner wall of the support shell 2. During the up and down movement of the third filter element 46, the three guide wheels 48 on the third filter element 46 cooperate with the support shell 2, so that the central axis of the third filter element 46 always coincides with the central axis of the second filter element 14.

[0046] When this filter filters wastewater, the filter screens on the four third filter elements 46 further filter the wastewater after it has been filtered by the first filter element 12 and the second filter element 14, improving the filtration effect of this filter. When the first sliding plate 10 moves its upper parts downward, the first sliding plate 10 moves the lowest third filter element 46 downward, and the two middle third filter elements 46 move downward simultaneously. The three bellows 47 are gradually stretched. During the downward movement of the two middle third filter elements 46, the guide wheel 48 moves downward along the inner wall of the support shell 2. The guide wheel 48 guides the adjacent third filter elements 46, making the central axis of the third filter element 46 coincide with the central axis of the second filter element 14. This prevents the third filter element from being damaged during use and backwashing. When filter element 46 collides with the second filter element 14, and the filter screens on the first filter element 12 and the second filter element 14 are backwashed, the operator activates the second solenoid valve 45 through the control box 4 to connect the third slag discharge pipe 44. The pressure of the filtered sewage increases. While backwashing the filter screens on the first filter element 12 and the second filter element 14, the filter screens on the four third filter elements 46 are backwashed simultaneously. The impurities on the third filter elements 46 flow downward along the third slag discharge pipe 44 to between the two limiting rings 42 and the rotating ring 43, and flow downward through the through hole of the second slag discharge pipe 41. As the second slag discharge pipe 41 rotates with the first slag discharge pipe 32, the rotating ring 43 will rotate between the two limiting rings 42. After the filter is backwashed, the operator closes the second solenoid valve 45.

[0047] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic backwashing sewage filter for water supply and drainage, comprising a support leg (1), a support shell (2) fixedly connected to the support leg (1), a top cover (3) fixedly connected to the support shell (2), and a control box (4) fixedly connected to the support shell (2), characterized in that: It also includes an outlet pipe (5), which is fixedly connected to and communicates with the side of the support shell (2) near the support leg (1). A fixed shell (6) is fixedly connected to the lower side of the top cover (3). An inlet pipe (7) is connected to and communicates with the fixed shell (6) through the side of the support shell (2) away from the support leg (1). An electric actuator (8) is fixedly connected to the support shell (2). A pressure detector (9) is installed on the delivery pipe connected to the inlet pipe (7). A first sliding plate (10) is sealed and slidably connected to the lower part of the support shell (2). A connecting shell (11) is rotatably connected to the first sliding plate (10). A first filter is installed on the connecting shell (11). The fixed shell (6) is slidably connected to a connecting ring (13), and a second filter element (14) is installed on the connecting ring (13). The second filter element (14) is located outside the first filter element (12). A sealing ring (141) that slides with the second filter element (14) is installed on the upper part of the first filter element (12). A first push rod (15) with a telescopic end fixed to the first sliding plate (10) is fixedly connected to the support shell (2). An auxiliary back-jet mechanism is provided between the support shell (2) and the fixed shell (6). The electric actuator (8), the pressure detector (9) and the first push rod (15) are all electrically connected to the control box (4). The auxiliary recoil mechanism includes a fixed ring (16), which is fixed between the support shell (2) and the fixed shell (6). A compression block (17) is sealed and slidably connected between the support shell (2) and the fixed shell (6). The compression block (17) is located on the lower side of the fixed ring (16). The fixed ring (16) is fixed with a second push rod (18) that is electrically connected to the control box (4). The telescopic end of the second push rod (18) passes through the fixed ring (16) and is fixed with the compression block (17). The second push rod (18) passes through the top cover (3), and the top cover (3) is fixed with the second push rod (18).

2. An automatic backwashing sewage filter for water supply and drainage as described in claim 1, characterized in that: Both the first filter element (12) and the second filter element (14) are cylindrical. Both the first filter element (12) and the second filter element (14) are provided with equally spaced through holes. Filter screens are installed in the through holes of the first filter element (12) and the second filter element (14). The inner walls of the first filter element (12) and the second filter element (14) are both smooth surfaces.

3. An automatic backwashing sewage filter for water supply and drainage as described in claim 2, characterized in that: The width of the sealing ring (141) is greater than the width between the upper and lower adjacent through holes of the second filter element (14), which is used to increase the sealing between the second filter element (14) and the sealing ring (141).

4. An automatic backwashing sewage filter for water supply and drainage as described in claim 3, characterized in that: It also includes a buffer mechanism, which is disposed on the fixed shell (6) and is used to buffer the pressure fluctuation of sewage. The buffer mechanism includes a fixed plate (19), which is fixed to the side of the fixed shell (6) away from the connecting ring (13). The fixed shell (6) is sealed and slidably connected to a second sliding plate (20). The second sliding plate (20) is located below the fixed plate (19). A spring (21) is fixed between the fixed plate (19) and the second sliding plate (20). The second sliding plate (20) is fixedly connected to a first connecting rod (22) which is fixed to the connecting ring (13). The top cover (3) is provided with a limiting component for limiting the second sliding plate (20).

5. An automatic backwashing sewage filter for water supply and drainage as described in claim 4, characterized in that: The limiting component includes a sliding rod (23), which is fixed to the second sliding plate (20). The sliding rod (23) slides in cooperation with the fixed plate (19) and the top cover (3). A limiting block (24) is fixed to one end of the sliding rod (23) away from the second sliding plate (20). The limiting block (24) is provided with a groove. The top cover (3) is rotatably connected to a limiting plate (25). The limiting plate (25) is provided with a groove that cooperates with the limiting block (24). An arc-shaped rack (26) is fixed to one side of the limiting plate (25). The top cover (3) is fixed to a first motor (27) that is electrically connected to the control box (4) through a mounting plate. The output shaft of the first motor (27) is fixed to a first gear (28) that meshes with the arc-shaped rack (26).

6. An automatic backwashing sewage filter for water supply and drainage as described in claim 5, characterized in that: The groove width of the limiting block (24) is smaller than the groove width of the limiting plate (25). Inclined surfaces are provided on both sides of the groove of the limiting block (24) to facilitate the cooperation between the limiting block (24) and the limiting plate (25).

7. An automatic backwashing sewage filter for water supply and drainage as described in claim 6, characterized in that: It also includes a slag discharge mechanism for periodically discharging filter residue. The slag discharge mechanism is disposed on the connecting shell (11) and includes a first toothed ring (29) fixedly connected to the connecting shell (11). The first sliding plate (10) is fixedly connected to a second motor (30) electrically connected to the control box (4) via a mounting base. The output shaft of the second motor (30) is fixedly connected to a second gear (31) meshing with the first toothed ring (29). The connecting shell (11) is fixedly connected to a first slag discharge pipe (32) via a connector. The central axis of the first slag discharge pipe (32) is perpendicular to the... The central axes of the connecting shell (11) coincide. A rotating sleeve (33) is sealed and rotatably connected between the connecting shell (11) and the first slag discharge pipe (32). A second toothed ring (34) is fixedly connected to the outside of the rotating sleeve (33). A third motor (35) electrically connected to the control box (4) is fixedly connected to the first slag discharge pipe (32) through a mounting seat. A third gear (36) meshing with the second toothed ring (34) is fixedly connected to the output shaft of the third motor (35). A sealing component is provided between the connecting shell (11) and the rotating sleeve (33). The sealing component is used to isolate the accumulated filter residue. The sealing assembly includes a sealing plate (37), which is fixed to the inner wall of the connecting shell (11). A rotating plate (38) is rotatably connected to the side of the sealing plate (37) near the rotating sleeve (33). Both the sealing plate (37) and the rotating plate (38) are provided with through holes spaced equally in the circumferential direction. A second connecting rod (39) is fixed to the rotating plate (38). The second connecting rod (39) is fixed to the rotating sleeve (33) through a mounting plate. The first slag discharge pipe (32) is fixed to and connected to a first solenoid valve (40) that is electrically connected to the control box (4).

8. An automatic backwashing sewage filter for water supply and drainage as described in claim 7, characterized in that: It also includes an auxiliary filtration mechanism, which is disposed inside the support shell (2). The auxiliary filtration mechanism is used for secondary filtration of sewage. The auxiliary filtration mechanism includes a second slag discharge pipe (41), which is fixedly connected to and communicates with the lower side of the first solenoid valve (40). The second slag discharge pipe (41) is fixedly connected to a mirror-distributed limiting ring (42). The mirror-distributed limiting ring (42) is sealed and rotatably connected to a rotating ring (43). The mirror-distributed limiting ring (42) and the rotating ring (43) cooperate to form a cavity. The second slag discharge pipe (41) is provided with circumferentially spaced through holes. The through holes of the second slag discharge pipe (41) communicate with the cavity formed by the mirror-distributed limiting ring (42) and the rotating ring (43). The first sliding plate (10) is fixedly connected to and communicates with the rotating ring (43) via a third slag discharge pipe (44). The third slag discharge pipe (44) is equipped with a second slag discharge pipe that is electrically connected to the control box (4). The solenoid valve (45) is provided with third filter elements (46) evenly spaced on the fixed housing (6) and the first sliding plate (10). The third filter elements (46) are located between the first sliding plate (10) and the fixed housing (6). The third filter elements (46) are all located outside the second filter element (14). A bellows (47) is fixedly connected between adjacent third filter elements (46). The third filter element (46) located on the upper side is fixedly connected to the fixed housing (6). The third filter element (46) located on the lower side is fixedly connected to the first sliding plate (10). The upper end of the third slag discharge pipe (44) is located between the third filter element (46) and the connecting shell (11). The third filter element (46) is provided with through holes at equal intervals, and a filter screen is installed in the through holes of the third filter element (46). A guide wheel (48) with equal circumferential intervals is fixedly connected to the outer side of the third filter element (46). The guide wheel (48) is pressed and fitted with the inner wall of the support shell (2).

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