Integrated sewage multi-stage treatment equipment with built-in replaceable functional module

Abstract

The invention relates to the technical field of water pollution treatment, and discloses integrated sewage multi-stage treatment equipment with built-in replaceable functional modules. Comprising a refined filtration box, a filter membrane arranged in the refined filtration box, a flushing nozzle fixedly installed in the refined filtration box, a driving motor fixedly installed on the outer wall of the refined filtration box and a sewage discharge plate fixedly installed in the refined filtration box, a baffle is fixedly installed on the inner wall of the refined filtration box, and the interior of the refined filtration box is divided into a water inlet area and a refined filtration area through the baffle; a filter membrane bracket is rotationally mounted in the fine filtration area, and the filter membrane is coated on the filter membrane bracket; the filter membrane bracket comprises two rotating plates rotationally mounted in the fine filtration area and a plurality of arc-shaped supporting plates mounted on opposite surfaces of the two rotating plates in a sliding manner. The device can automatically adjust the tension degree of the filter membrane according to the filtering and backwashing stages so as to ensure that backwashing is uniform and thorough.

Description

Technical Field

[0001] This invention relates to the technical field of water pollution treatment, and in particular to an integrated multi-stage wastewater treatment equipment with a built-in replacement function module. Background Technology

[0002] With the acceleration of industrialization and urbanization, the volume of sewage discharge is increasing daily, putting enormous pressure on the water environment. To achieve water resource recycling and environmental protection, sewage treatment technologies are constantly developing and improving. Currently, common sewage treatment processes typically include physical treatment, chemical treatment, and biological treatment stages. Among these, physical filtration is a crucial step in sewage treatment, primarily used to remove suspended solids, colloidal particles, and other impurities from sewage.

[0003] In existing precision filtration equipment, backwashing drum filters are widely used due to their high degree of automation and good filtration effect. However, existing backwashing drum filters still have the following drawbacks in practical applications: In existing drum filter equipment, the filter membrane is typically fixed directly to the drum wall by a rigid support or a fixed tensioning mechanism. This fixed tension structure has significant drawbacks: during the filtration stage, a high tension is usually required to prevent impurities from penetrating, but this increases water flow resistance, reduces filtration efficiency, and increases membrane wear; during the backwashing stage, the filter membrane needs a certain degree of elastic relaxation to allow for slight deformation under water flow, disrupting the mechanical interlocking and adsorption between impurities and the membrane, thus facilitating impurity removal. However, current technology cannot automatically switch the membrane tension state between the two distinctly different stages of filtration and backwashing, resulting in incomplete backwashing (excessive tension) or decreased filtration accuracy (excessive tension), severely impacting the overall operating performance of the equipment. Summary of the Invention

[0004] Given that existing technologies have a single and fixed method for adjusting the tension of the filter membrane, which cannot be adapted to different treatment stages, an integrated multi-stage wastewater treatment equipment with a built-in replacement function module is proposed.

[0005] This application provides an integrated multi-stage wastewater treatment equipment with a built-in replacement function module, the purpose of which is to automatically adjust the filter membrane tension according to the filtration and backwashing stages to ensure uniform and thorough backwashing.

[0006] The technical solution of this invention is as follows: an integrated multi-stage wastewater treatment equipment with a built-in replacement function module, including a fine filter box, a filter membrane disposed inside the fine filter box, a flushing nozzle fixedly installed inside the fine filter box, a drive motor fixedly installed on the outer wall of the fine filter box, and a drain plate fixedly installed inside the fine filter box. When the filter membrane is clogged, the flushing nozzle sprays water to backwash the impurities on the surface of the filter membrane, and the drive motor drives the filter membrane to rotate. After the impurities are removed from the surface of the filter membrane, they fall into the drain plate and are discharged. A baffle is fixedly installed on the inner wall of the fine filter box, and the interior of the fine filter box is divided into an inlet area and a fine filter area by the baffle. A filter membrane support is rotatably installed inside the fine filter area, and the filter membrane covers the filter membrane support. The filter membrane support includes two rotating plates rotatably installed inside the fine filter area and multiple arc-shaped support plates slidably installed on the opposite surfaces of the two rotating plates. By synchronously sliding the multiple arc-shaped support plates, the tension of the filter membrane can be adjusted to adapt to the filtration stage and the backwashing stage.

[0007] Furthermore, a fixing plate is fixedly installed on the outer wall of the arc-shaped support plate, and a T-shaped slider is fixedly installed on the side of the fixing plate near the rotating plate. A T-shaped groove for the T-shaped slider to slide is opened on the side of the rotating plate near the arc-shaped support plate.

[0008] Furthermore, a fixed rod is fixedly installed on one of the rotating plates near the water inlet area. A sliding sleeve is slidably installed on the wall of the fixed rod. A hinge rod is hinged to the wall of the sliding sleeve, and the end of the hinge rod away from the wall of the sliding sleeve is hinged to the inner wall of the arc-shaped support plate. The other rotating plate is annular with a through groove in its middle. A sealing ring is provided between the other rotating plate and the baffle.

[0009] Furthermore, a tension spring is fitted on the wall of the fixed rod, a connecting rope is fixedly connected to one end of the sliding sleeve near the water inlet area, a float is fixedly connected to the other end of the connecting rope away from the sliding sleeve, and one end of the tension spring is fixedly connected to the side of one of the rotating plates near the water inlet area, and the other end of the tension spring is fixedly connected to the other end of the sliding sleeve away from the water inlet area. When the water level inside the fine filter box rises, the float rises vertically.

[0010] Furthermore, a locking cylinder is fixedly installed on the inner wall of the water inlet area, and a limit block is fixedly installed on the wall of the sliding sleeve. A limit groove is opened at one end of the locking cylinder near the sliding sleeve to limit the movement stroke of the limit block. A through hole is also opened inside the locking cylinder for the connecting rope to pass through.

[0011] Furthermore, the limiting groove includes a slot opened at one end of the locking cylinder near the sliding sleeve, a transverse groove opened on the inner wall of the slot for the limiting block to be inserted, and an annular groove opened inside the locking cylinder for the limiting block to rotate one revolution, and the slot, transverse groove and annular groove are interconnected.

[0012] Furthermore, a positioning plate is fixedly installed on the inner wall of the water inlet area, and a hollow installation cylinder is fixedly installed inside the positioning plate. A traction rod for guiding the connecting rope is fixedly installed on the inner wall of the water inlet area, and the float is located inside the installation cylinder.

[0013] Furthermore, a first connecting plate is fixedly installed on the side of one of the arc-shaped support plates, and a second connecting plate is fixedly installed on the side of the other arc-shaped support plate. A first connecting ball is rotatably mounted on the first connecting plate, and a T-shaped rod is fixedly mounted on the outer wall of the first connecting ball. A second connecting ball is rotatably mounted on the second connecting plate, and a connecting cylinder is fixedly connected to the outer wall of the second connecting ball. The end of the T-shaped rod away from the first connecting ball slides inside the connecting cylinder, and a compression spring is sleeved on the rod wall of the T-shaped rod. Mounting holes are opened at both ends of the filter membrane.

[0014] Furthermore, a first annular component is snapped into the interior of the first connecting plate, and a first hemispherical cap is detachably installed on the side of the first connecting plate away from the second connecting plate via bolts. A second annular component is snapped into the interior of the second connecting plate, and a second hemispherical cap is detachably installed on the side of the second connecting plate away from the first connecting plate via bolts. The second connecting ball rotates inside the second annular component and the second hemispherical cap, and the first connecting ball rotates inside the first annular component and the first hemispherical cap.

[0015] Furthermore, an inlet pipe is fixedly installed on the outer wall of the fine filter box, which is connected to the interior of the inlet water area. An outlet pipe is fixedly installed on the outer wall of the fine filter box, which is connected to the interior of the fine filter area. An air flotation treatment box is set on one side of the fine filter box, and the end of the inlet pipe away from the fine filter box is connected to the interior of the air flotation treatment box.

[0016] The beneficial effects of this invention are: 1. When the filter membrane becomes clogged, the water level inside the fine filter tank rises. The connecting rope pulls the sliding sleeve towards the inlet area. Simultaneously, the hinge rod moves multiple arc-shaped support plates closer together, reducing the filter membrane tension to a low tension. This makes the membrane elastic, facilitating the flushing and removal of impurities from the membrane surface. After the water level drops, the float lowers, and the tension spring causes the sliding sleeve, hinge rod, and arc-shaped support plates to reset. At the moment of reset, the multiple arc-shaped support plates move synchronously to their maximum distance, placing the filter membrane at high tension and quickly restoring filtration accuracy to prevent impurity residue. Once the tension spring's momentary force dissipates, the distance between the multiple arc-shaped support plates returns to its initial state, placing the filter membrane at medium tension. This ensures filtration accuracy, prevents impurity penetration, and avoids excessive water flow resistance, maintaining a reasonable filtration speed.

[0017] 2. When the sliding sleeve moves towards the water inlet area, the end of the sliding sleeve closest to the water inlet area is inserted into the slot, and the limiting block is inserted into the transverse groove of the limiting groove until the limiting block enters the annular groove. Subsequently, the drive motor drives one of the rotating plates to rotate, and one of the rotating plates drives multiple arc-shaped support plates and another rotating plate to rotate. At the same time, under the action of the guide strip and guide groove, the fixed rod and the sliding sleeve also rotate synchronously with the rotating plate. At this time, the limiting block rotates inside the annular groove until the filter membrane rotates at least one revolution. The flushing nozzle completely and evenly flushes the filter pores on the surface of the filter membrane, effectively improving the uniformity of flushing the filter membrane by the flushing pipe and flushing nozzle. This effectively avoids the situation where the water level inside the fine filter box drops after only some filter pores on the surface of the filter membrane have been flushed, causing multiple arc-shaped support plates to reset prematurely. Attached Figure Description

[0018] Figure 1 This is a front view of the entire invention; Figure 2 This is a top view of the entire invention; Figure 3 This is a schematic diagram of the internal structure of the fine filter box in this invention; Figure 4 This is a schematic diagram of the installation of the arc-shaped support plate in this invention; Figure 5 This is a perspective view of the filter membrane support in this invention; Figure 6 This is a front view of the hinge rod in this invention; Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle; Figure 8 This is a side view of the arc-shaped support plate in this invention; Figure 9 For the present invention Figure 8 Enlarged view of point B in the middle; Figure 10 This is a schematic diagram of the installation of the T-shaped slider in this invention; Figure 11 This is a schematic diagram of the installation of the guide strip in this invention; Figure 12 This is a schematic diagram of the installation of the float in this invention; Figure 13 This is a three-dimensional view of the filter membrane in this invention.

[0019] In the picture: 1. Fine filter box; 2. Inlet pipe; 3. Outlet pipe; 4. Air flotation treatment box; 5. Baffle; 6. Filter membrane support; 7. Filter membrane; 8. Rotating plate; 9. Arc-shaped support plate; 10. Fixing plate; 11. T-shaped slider; 12. T-shaped slide groove; 13. Fixing rod; 14. Sliding sleeve; 15. Hinge rod; 16. Tension spring; 17. Guide bar; 18. Guide groove; 19. Limiting block; 20. Locking cylinder; 21. Limiting groove; 22. Slot; 23. Horizontal groove; 24. Annular groove; 25. Through hole; 26. Connecting rope; 27. Float ball; 28. Mounting cylinder; 29. ​​Positioning plate; 30. Traction rod; 31. First connecting plate; 32. First annular component; 33. First hemispherical cap; 34. First connecting ball; 35. Second connecting plate; 36. Second annular component; 37. Second hemispherical cap; 38. Second connecting ball; 39. T-shaped rod; 40. Connecting cylinder; 41. Compression spring; 42. Sealing ring; 43. Flushing pipe; 44. Flushing nozzle; 45. Sewage discharge plate; 46. Through groove; 47. Mounting hole; 48. Drive motor; 49. Water inlet area; 50. Fine filtration area. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Example 1, referring to Figures 1-13 This invention provides, in its first embodiment, an integrated multi-stage wastewater treatment device with a built-in replacement module, comprising a fine filter box 1, a filter membrane 7 disposed inside the fine filter box 1, a flushing nozzle 44 fixedly installed inside the fine filter box 1, a drive motor 48 fixedly installed on the outer wall of the fine filter box 1, and a drain plate 45 fixedly installed inside the fine filter box 1. When the filter membrane 7 is clogged, the flushing nozzle 44 sprays water to backwash the impurities on the surface of the filter membrane 7, and the drive motor 48 drives the filter membrane 7 to rotate, causing the impurities to detach from the surface of the filter membrane 7 and fall into the drain plate 45 for discharge. An inlet pipe 2, communicating with the interior of the inlet area 49, is fixedly installed on the outer wall of the fine filter box 1, and an outlet pipe 3, communicating with the interior of the fine filtration area 50, is fixedly installed on the outer wall of the fine filter box 1. An air flotation treatment tank 4 is disposed on one side of the fine filter box 1, and the end of the inlet pipe 2 away from the fine filter box 1 is connected to the interior of the air flotation treatment tank 4. A baffle 5 is fixedly installed on the inner wall of the fine filter box 1, and the interior of the fine filter box 1 is divided into an inlet zone 49 and a fine filter zone 50 by the baffle 5.

[0022] Specifically, the dissolved air flotation (DAF) treatment tank 4 is equipped with a dissolved air release device and a scum scraper. The dissolved air release device is used to dissolve compressed air in the wastewater to form microbubbles, and the scum scraper is used to remove scum. The inlet zone 49 is connected to the outlet of the DAF treatment tank 4 through the inlet pipe 2 and a flow meter. In addition, the DAF treatment tank 4 can also be connected to other wastewater treatment facilities to further improve the wastewater treatment effect.

[0023] Wastewater enters the dissolved air flotation (DAF) treatment tank 4 through the inlet. Microbubbles generated by the dissolved air release device adsorb suspended solids, oil, and other impurities, forming scum. A scraper then scrapes the scum to the top of the DAF treatment tank 4 and discharges it. The treated wastewater then enters the inlet area 49 of the fine filter tank 1 through the inlet pipe 2, and then flows into the fine filter area 50. Through the filtration action of the filter membrane 7, fine impurities are trapped, and the filtered clean water flows out from the outlet pipe 3. It should be noted that the material and pore size of the filter membrane 7 can be adjusted according to the type of wastewater.

[0024] When the filter membrane 7 becomes clogged, the drive motor 48 starts, driving one of the rotating plates 8 to rotate, causing the filter membrane 7 to circumferentially rotate within the fine filtration zone 50. Simultaneously, a flushing pipe 43 is connected to the flushing nozzle 44, which sprays water. The water pressure and direction of the flushing nozzle 44 can adapt to different impurity characteristics. Its reverse flushing flow field is opposite to the rotation direction of the filter membrane 7, enhancing the impurity removal effect. The detached impurities fall onto the drain plate 45, which is inclined, allowing the impurities to slide down its inclined surface and be discharged through the drain port, thus achieving backwashing. It should be noted that the starting method of the drive motor 48 and the flushing nozzle 44 is a mature existing technology, and no specific limitations are made here. In this embodiment, the following methods can be used: installing an electronic liquid level sensor (such as an ultrasonic liquid level gauge or an electrode-type liquid level switch) inside the fine filtration box 1 or setting a differential pressure sensor between the inlet and outlet of the filter membrane 7. When the filter membrane 7 becomes clogged, causing the water level inside the fine filter tank 1 to rise, or when the pressure difference across the filter membrane 7 increases to a preset threshold, the sensor converts the detected physical change into an electrical signal and transmits it to an external PLC (Programmable Logic Controller) or relay control unit. After receiving the signal and performing logical judgment, the control system simultaneously outputs control commands: on the one hand, it sends an electrical signal to the drive motor 48 to start the motor and drive the filter membrane 7 to rotate; on the other hand, it sends an electrical signal to the solenoid valve on the flushing pipe 43 to open the valve, allowing high-pressure water to enter the flushing nozzle 44 for spraying, thereby completing the backwashing initiation.

[0025] Reference Figures 3-5 The filter membrane support 6 is rotatably installed inside the fine filtration zone 50, and the filter membrane 7 is covered on the filter membrane support 6. The filter membrane support 6 includes two rotating plates 8 rotatably installed inside the fine filtration zone 50 and multiple arc-shaped support plates 9 slidably installed on the opposite sides of the two rotating plates 8. By synchronously sliding the multiple arc-shaped support plates 9, the tension of the filter membrane 7 can be adjusted to adapt to the filtration stage and the backwashing stage.

[0026] Specifically, different purification steps require different levels of tension to optimize the results: During the filtration stage: the filter membrane 7 and the filter membrane support 6 do not rotate. At this time, the filter membrane 7 is under medium tension, which ensures filtration accuracy, prevents impurities from penetrating, avoids excessive water flow resistance, and maintains a reasonable filtration speed.

[0027] During the backwashing stage: The filter membrane 7 and the filter membrane support 6 rotate. At this time, multiple arc-shaped support plates 9 approach synchronously, and the filter membrane 7 is at a low tension, making it elastic and facilitating the washing and removal of impurities from its surface. It should be noted that the adhesion between impurities (such as suspended solids and colloids) on the surface of the filter membrane 7 and the filter membrane 7 mainly comes from van der Waals forces, electrostatic forces, and mechanical interlocking. When the filter membrane 7 is relaxed (at low tension), its own elasticity causes it to undergo slight deformation under the backwashing force (water flow) (being lifted by the water flow). This deformation disrupts the mechanical interlocking between the impurities and the surface of the filter membrane 7 (the part of the impurity embedded in the pores of the filter membrane 7 is loosened), and at the same time, the elastic vibration of the filter membrane 7 weakens the effects of van der Waals forces and electrostatic forces, making it easier for impurities to detach.

[0028] During the instantaneous recovery phase after backwashing: the filter membrane 7 and the filter membrane support 6 stop rotating. At this time, multiple arc-shaped support plates 9 simultaneously move away to their farthest distance, the filter membrane 7 is under high tension, quickly restoring filtration accuracy and preventing impurity residue.

[0029] Reference Figure 8 as well as Figure 10 A fixing plate 10 is fixedly installed on the outer wall of the arc-shaped support plate 9. A T-shaped slider 11 is fixedly installed on the side of the fixing plate 10 near the rotating plate 8. A T-shaped groove 12 for sliding the T-shaped slider 11 is opened on the side of the rotating plate 8 near the arc-shaped support plate 9.

[0030] Specifically, the T-shaped groove 12 is arranged radially along the rotating plate 8, and the surface of the T-shaped groove 12 is hardened to improve wear resistance. Through the cooperation between the T-shaped groove 12 and the T-shaped slider 11, the sliding connection between the arc-shaped support plate 9 and the rotating plate 8 is realized.

[0031] Reference Figures 4-5 One of the rotating plates 8 has a fixed rod 13 fixedly installed on the side near the water inlet area 49. A sliding sleeve 14 is slidably installed on the wall of the fixed rod 13. A hinge rod 15 is hinged to the wall of the sliding sleeve 14, and the end of the hinge rod 15 away from the wall of the sliding sleeve 14 is hinged to the inner wall of the arc-shaped support plate 9. The other rotating plate 8 is annular, with a through groove 46 in the middle. A sealing ring 42 is provided between the other rotating plate 8 and the baffle 5.

[0032] Specifically, during the rotation of the rotating plate 8, the sealing ring 42 ensures the seal between the water inlet area 49, the baffle 5 and the fine filtration area 50.

[0033] Reference Figure 5 as well as Figure 8A tension spring 16 is sleeved on the wall of the fixed rod 13. A connecting rope 26 is fixedly connected to one end of the sliding sleeve 14 near the water inlet area 49. A float 27 is fixedly connected to the other end of the connecting rope 26 away from the sliding sleeve 14. One end of the tension spring 16 is fixedly connected to the side of one of the rotating plates 8 near the water inlet area 49. The other end of the tension spring 16 is fixedly connected to the other end of the sliding sleeve 14 away from the water inlet area 49. When the water level inside the fine filter box 1 rises, the float 27 rises in the vertical direction.

[0034] Specifically, when the water level inside the fine filter box 1 rises, the float 27 rises vertically under the action of buoyancy, and then the connecting rope 26 can pull the sliding sleeve 14 to move towards the water inlet area 49.

[0035] During use, when the filter membrane 7 becomes clogged, the water level inside the fine filter box 1 rises. The float 27 rises vertically under buoyancy, and the connecting rope 26 pulls the sliding sleeve 14 towards the water inlet area 49. With the linkage of the hinge rod 15, multiple arc-shaped support plates 9 move closer together, causing the tension of the filter membrane 7 to decrease, resulting in low tension and elasticity, facilitating the removal of impurities from the membrane surface. Simultaneously, the sliding sleeve 14 pulls the tension spring 16, generating elastic force. After the water level in the fine filter box 1 drops, the float 27 descends, and under the elastic force of the tension spring 16, the sliding sleeve 14, hinge rod 15, and arc-shaped support plates 9 reset. At the moment of reset, the multiple arc-shaped support plates 9 simultaneously move away to their furthest distance, the filter membrane 7 is at high tension, quickly restoring filtration accuracy and preventing impurity residue. After the momentary elastic force of the tension spring 16 ends, the distance between the multiple arc-shaped support plates 9 returns to its initial state, and the filter membrane 7 is under medium tension, which ensures filtration accuracy, prevents impurities from penetrating, avoids excessive water flow resistance, and maintains a reasonable filtration speed.

[0036] Example 2, refer to Figures 1-13 This is the second embodiment of the present invention, which differs from the first embodiment in that: a locking cylinder 20 is fixedly installed on the inner wall of the water inlet zone 49, and a limiting block 19 is fixedly installed on the cylinder wall of the sliding sleeve 14. A limiting groove 21 for limiting the movement stroke of the limiting block 19 is opened at one end of the locking cylinder 20 near the sliding sleeve 14. A through hole 25 for the connecting rope 26 to pass through is also opened inside the locking cylinder 20. The limiting groove 21 includes a slot 22 opened at one end of the locking cylinder 20 near the sliding sleeve 14, a transverse groove 23 opened on the inner wall of the slot 22 for the limiting block 19 to be inserted, and an annular groove 24 opened inside the locking cylinder 20 for the limiting block 19 to rotate one revolution. The slot 22, the transverse groove 23 and the annular groove 24 are interconnected.

[0037] Specifically, existing backwashing controls often employ simple timer or level control. The drive motor 48 starts rotating and begins backwashing as soon as the blockage is relieved. This method often results in the filter membrane 7 stopping backwashing before it has rotated one full revolution, causing the nozzles to fail to evenly cover the entire surface of the filter membrane 7. This results in some areas being cleaned while other areas still have impurities remaining, affecting subsequent filtration efficiency and the lifespan of the filter membrane 7.

[0038] Therefore, when the filter membrane 7 is clogged, the setting of the limiting groove 21 ensures that the filter membrane 7 will only pull the limiting block 19 and the sliding sleeve 14 out of the locking cylinder 20 after rotating at least one revolution under the tension of the tension spring 16, which effectively improves the uniformity of rinsing the filter membrane 7 by the rinsing pipe 43 and the rinsing nozzle 44.

[0039] Reference Figure 8 A positioning plate 29 is fixedly installed on the inner wall of the water inlet area 49. A hollow installation cylinder 28 is fixedly installed inside the positioning plate 29. A traction rod 30 for guiding the connecting rope 26 is fixedly installed on the inner wall of the water inlet area 49, and the float 27 is located inside the installation cylinder 28.

[0040] Specifically, the mounting cylinder 28 ensures that the float 27 can rise or fall vertically under the action of buoyancy, and the setting of the traction rod 30 enables the tension of the connecting rope 26 to be transmitted to the sliding sleeve 14 in a timely manner.

[0041] Reference Figure 11 The guide bar 17 is fixedly connected to the wall of the fixed rod 13, and the inner wall of the sliding sleeve 14 is provided with a guide groove 18 that is adapted to the guide bar 17.

[0042] The remaining structure is the same as that in Example 1.

[0043] During use, when the sliding sleeve 14 moves towards the water inlet area 49, the end of the sliding sleeve 14 near the water inlet area 49 is inserted into the slot 22. The limiting block 19 is inserted into the transverse groove 23 of the limiting groove 21 until the limiting block 19 enters the annular groove 24. Then, the drive motor 48 drives one of the rotating plates 8 to rotate, and one of the rotating plates 8 drives multiple arc-shaped support plates 9 and another rotating plate 8 to rotate. At the same time, under the action of the guide bar 17 and the guide groove 18, the fixing rod 13 and the sliding sleeve 14 also rotate synchronously with the rotating plate 8. At this time, the limiting block 19 rotates inside the annular groove 24 until the filter membrane 7 rotates at least one revolution. The rinsing nozzle 44 completely and evenly rinsing the filter holes on the surface of the filter membrane 7. The limiting block 19 rotates back to the position of the transverse groove 23. Under the tension of the tension spring 16, the limiting block 19 and the sliding sleeve 14 can be disengaged from the locking cylinder 20, which effectively improves the uniformity of rinsing the filter membrane 7 by the rinsing pipe 43 and the rinsing nozzle 44. It should be noted that if the surface of the filter membrane 7 is still blocked after rotating once, the water level inside the fine filter box 1 is still too high. Under the action of buoyancy, the float 27 and the connecting rope 26 are still pulling the sliding sleeve 14. Therefore, the limiting block 19 and the sliding sleeve 14 will continue to rotate along the annular groove 24, thereby ensuring that the filter membrane 7 rotates at least once (or possibly two or three times, etc.) until the surface of the filter membrane 7 is no longer blocked. Under the tension of the tension spring 16, the limiting block 19 and the sliding sleeve 14 will be pulled out of the locking cylinder 20, and the multiple arc-shaped support plates 9 will be reset, which effectively improves the uniformity of rinsing the filter membrane 7 by the rinsing pipe 43 and the rinsing nozzle 44.

[0044] Example 3, referring to Figures 8-9 ,as well as Figure 13This is the third embodiment of the present invention, which differs from the second embodiment in that: a first connecting plate 31 is fixedly installed on the side of one of the arc-shaped support plates 9, and a second connecting plate 35 is fixedly installed on the side of the other arc-shaped support plate 9; a first connecting ball 34 is rotatably disposed on the first connecting plate 31, and a T-shaped rod 39 is fixedly installed on the outer wall of the first connecting ball 34; a second connecting ball 38 is rotatably disposed on the second connecting plate 35, and a connecting cylinder 40 is fixedly connected to the outer wall of the second connecting ball 38; and the end of the T-shaped rod 39 away from the first connecting ball 34 slides inside the connecting cylinder 40; a compression spring 41 is sleeved on the rod wall of the T-shaped rod 39; and mounting holes 47 are provided at both ends of the filter membrane 7. The first connecting plate 31 is internally engaged with a first annular member 32. The side of the first connecting plate 31 away from the second connecting plate 35 is detachably mounted with a first hemispherical cap 33 by bolts. The second connecting plate 35 is internally engaged with a second annular member 36. The side of the second connecting plate 35 away from the first connecting plate 31 is detachably mounted with a second hemispherical cap 37 by bolts. The second connecting ball 38 rotates inside the second annular member 36 and the second hemispherical cap 37. The first connecting ball 34 rotates inside the first annular member 32 and the first hemispherical cap 33.

[0045] Specifically, the rotational engagement of the first connecting ball 34 and the second connecting ball 38, along with the sliding engagement of the T-shaped rod 39, enables synchronous movement with the arc-shaped support plate 9. When the arc-shaped support plate 9 slides, the filter membrane 7 deforms synchronously, adapting to the tension requirements of the filtration and backwashing stages, ensuring the uniformity of the tension adjustment of the filter membrane 7, and avoiding localized abnormal tension.

[0046] The two ends of the filter membrane 7 can be engaged with the first connecting plate 31 and the second connecting plate 35 through the mounting holes 47, so that the entire filter membrane 7 is wound around the surface of multiple arc-shaped support plates 9. The detachable first hemispherical cap 33 and second hemispherical cap 37 can effectively protect the first connecting ball 34 and the second connecting ball 38, preventing direct impact from external forces in case of accidents. By pressing the spherical surface of the first connecting ball 34 away from the T-shaped rod 39, the first connecting ball 34 can be squeezed out from inside the first annular part 32. Similarly, the second connecting ball 38 can be disassembled, ultimately achieving the effect of replacing and disassembling the filter membrane 7, further improving the convenience of maintenance of this device.

[0047] The remaining structure is the same as that in Example 2.

[0048] Working principle: Wastewater enters the dissolved air flotation (DAF) treatment tank 4 through inlet pipe 2. Microbubbles generated by the dissolved air release device adsorb suspended solids, oil, and other impurities, forming scum. A scraper then scrapes the scum to the top of the DAF treatment tank 4 and discharges it. The treated wastewater then enters the inlet area 49 of the fine filter tank 1 and flows into the fine filter area 50. Through the filtration action of the filter membrane 7, fine impurities are trapped, and the filtered clean water flows out from outlet pipe 3.

[0049] When the filter membrane 7 becomes clogged, the water level inside the fine filter box 1 rises. The float 27 rises vertically under buoyancy, and the connecting rope 26 pulls the sliding sleeve 14 towards the inlet area 49. With the linkage of the hinge rod 15, multiple arc-shaped support plates 9 move closer together, reducing the tension of the filter membrane 7 to a low tension, making it elastic and facilitating the rinsing and removal of impurities from its surface. Simultaneously, the end of the sliding sleeve 14 near the inlet area 49 is inserted into the slot 22, and the limiting block 19 is inserted into the transverse groove 23 of the limiting groove 21 until it enters the annular groove 24. Then, the drive motor 48 drives one of the rotating plates 8 to rotate, which in turn drives multiple arc-shaped support plates 9 and another rotating plate 8 to rotate. Under the action of the guide bar 17 and the guide groove 18, the fixing rod 13 and the sliding sleeve 14 also rotate synchronously with the rotating plate 8. At this time, the limiting block 19 rotates inside the annular groove 24.

[0050] As the filter membrane 7 rotates circumferentially within the fine filtration zone 50, the flushing nozzle 44 sprays water. The reverse flushing flow field is opposite to the rotation direction of the filter membrane 7. Impurities detached from the surface of the filter membrane 7 fall onto the drain plate 45 and slide down its inclined surface to the drain outlet on the drain plate 45 for discharge, thus achieving backwashing. During this process, the flushing nozzle 44 completely and evenly flushes the filter pores on the surface of the filter membrane 7. The filter membrane 7 rotates at least one revolution, and finally, the limiting block 19 rotates back to the position of the transverse groove 23. Under the tension of the tension spring 16, the limiting block 19 and the sliding sleeve 14 disengage from the interior of the locking cylinder 20.

[0051] It should be noted that when the connecting rope 26 pulls the sliding sleeve 14 towards the water inlet area 49, under the linkage of the hinge rod 15, multiple arc-shaped support plates 9 can be moved closer to each other simultaneously, causing the tension of the filter membrane 7 to decrease and reach a low tension, making the filter membrane 7 elastic and facilitating the flushing and removal of impurities from the surface of the filter membrane 7. After the water level inside the fine filter box 1 drops, the float 27 decreases in height, and under the elastic force of the tension spring 16, it can drive the sliding sleeve 14, hinge rod 15, and arc-shaped support plates 9 to reset. At the moment of reset, multiple arc-shaped support plates 9 move synchronously to their farthest distance, the filter membrane 7 is at a high tension, quickly restoring filtration accuracy and avoiding impurity residue. After the instantaneous elastic force of the tension spring 16 ends, the distance between multiple arc-shaped support plates 9 returns to its initial state, the filter membrane 7 is at a medium tension, ensuring filtration accuracy, preventing impurity penetration, and avoiding excessive water flow resistance, maintaining a reasonable filtration speed.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An integrated multi-stage wastewater treatment equipment with a built-in replacement function module, comprising a fine filter box (1), a filter membrane (7) disposed inside the fine filter box (1), a flushing nozzle (44) fixedly installed inside the fine filter box (1), a drive motor (48) fixedly installed on the outer wall of the fine filter box (1), and a drain plate (45) fixedly installed inside the fine filter box (1). When the filter membrane (7) is clogged, the flushing nozzle (44) sprays water to backwash the impurities on the surface of the filter membrane (7), and the drive motor (48) drives the filter membrane (7) to rotate. The impurities fall off the surface of the filter membrane (7) and fall into the drain plate (45) for discharge. The equipment is characterized in that... The inner wall of the fine filter box (1) is fixedly installed with a baffle (5), and the interior of the fine filter box (1) is divided into an inlet area (49) and a fine filter area (50) by the baffle (5). The fine filtration zone (50) is rotatably mounted with a filter membrane support (6), and the filter membrane (7) is wrapped around the filter membrane support (6); The filter membrane support (6) includes two rotating plates (8) rotatably installed inside the fine filtration zone (50) and multiple arc-shaped support plates (9) slidably installed on the opposite sides of the two rotating plates (8). By synchronously sliding the multiple arc-shaped support plates (9), the tension of the filter membrane (7) can be adjusted to adapt to the filtration stage and the backwashing stage.

2. The integrated multi-stage wastewater treatment equipment with a built-in replacement function module as described in claim 1, characterized in that: A fixing plate (10) is fixedly installed on the outer wall of the arc-shaped support plate (9). A T-shaped slider (11) is fixedly installed on the side of the fixing plate (10) near the rotating plate (8). A T-shaped groove (12) for sliding the T-shaped slider (11) is opened on the side of the rotating plate (8) near the arc-shaped support plate (9).

3. The integrated multi-stage wastewater treatment equipment with a built-in replacement function module as described in claim 1, characterized in that: One of the rotating plates (8) is fixedly mounted with a fixed rod (13) on the side near the water inlet area (49). A sliding sleeve (14) is slidably mounted on the wall of the fixed rod (13). A hinge rod (15) is hinged to the wall of the sliding sleeve (14), and the end of the hinge rod (15) away from the wall of the sliding sleeve (14) is hinged to the inner wall of the arc-shaped support plate (9). Another rotating plate (8) is annular, with a through groove (46) in its middle, and a sealing ring (42) is provided between the other rotating plate (8) and the baffle (5).

4. The integrated multi-stage wastewater treatment equipment with a built-in replacement function module as described in claim 3, characterized in that: The fixed rod (13) is fitted with a tension spring (16). The end of the sliding sleeve (14) near the water inlet area (49) is fixedly connected to a connecting rope (26). The end of the connecting rope (26) away from the sliding sleeve (14) is fixedly connected to a float (27). One end of the tension spring (16) is fixedly connected to the side of one of the rotating plates (8) near the water inlet area (49). The other end of the tension spring (16) is fixedly connected to the end of the sliding sleeve (14) away from the water inlet area (49). When the water level inside the fine filter box (1) rises, the float (27) rises in the vertical direction.

5. The integrated multi-stage wastewater treatment equipment with a built-in replacement function module as described in claim 4, characterized in that: A locking cylinder (20) is fixedly installed on the inner wall of the water inlet area (49), and a limiting block (19) is fixedly installed on the cylinder wall of the sliding sleeve (14). A limiting groove (21) for limiting the movement stroke of the limiting block (19) is opened at one end of the locking cylinder (20) near the sliding sleeve (14). A through hole (25) for the connecting rope (26) to pass through is also opened inside the locking cylinder (20).

6. The integrated multi-stage wastewater treatment equipment with a built-in replacement function module as described in claim 5, characterized in that: The limiting groove (21) includes a slot (22) opened at one end of the locking cylinder (20) near the sliding sleeve (14), a transverse groove (23) opened on the inner wall of the slot (22) for the limiting block (19) to be inserted, and an annular groove (24) opened inside the locking cylinder (20) for the limiting block (19) to rotate one revolution, and the slot (22), the transverse groove (23) and the annular groove (24) are interconnected.

7. The integrated multi-stage wastewater treatment equipment with a built-in replacement function module as described in claim 4, characterized in that: A positioning plate (29) is fixedly installed on the inner wall of the water inlet area (49). A hollow installation cylinder (28) is fixedly installed inside the positioning plate (29). A traction rod (30) for guiding the connecting rope (26) is fixedly installed on the inner wall of the water inlet area (49), and the float (27) is located inside the installation cylinder (28).

8. The integrated multi-stage wastewater treatment equipment with a built-in replacement function module as described in claim 7, characterized in that: A first connecting plate (31) is fixedly installed on the side of one of the arc-shaped support plates (9), and a second connecting plate (35) is fixedly installed on the side of the other arc-shaped support plate (9). A first connecting ball (34) is rotatably arranged on the first connecting plate (31), and a T-shaped rod (39) is fixedly installed on the outer wall of the first connecting ball (34). A second connecting ball (38) is rotatably disposed on the second connecting plate (35). A connecting cylinder (40) is fixedly connected to the outer wall of the second connecting ball (38). The end of the T-shaped rod (39) away from the first connecting ball (34) slides inside the connecting cylinder (40). A compression spring (41) is sleeved on the rod wall of the T-shaped rod (39). The filter membrane (7) has mounting holes (47) at both ends.

9. The integrated multi-stage wastewater treatment equipment with a built-in replacement function module as described in claim 8, characterized in that: The first connecting plate (31) is fitted with a first annular member (32). The side of the first connecting plate (31) away from the second connecting plate (35) is detachably fitted with a first hemispherical cap (33) by bolts. The second connecting plate (35) is fitted with a second annular member (36). The side of the second connecting plate (35) away from the first connecting plate (31) is detachably fitted with a second hemispherical cap (37) by bolts. The second connecting ball (38) rotates inside the second annular member (36) and the second hemispherical cap (37). The first connecting ball (34) rotates inside the first annular member (32) and the first hemispherical cap (33).

10. The integrated multi-stage wastewater treatment equipment with a built-in replacement function module according to claim 1, characterized in that: The outer wall of the fine filter box (1) is fixedly installed with an inlet pipe (2) that communicates with the interior of the inlet area (49). The outer wall of the fine filter box (1) is fixedly installed with an outlet pipe (3) that communicates with the interior of the fine filter area (50). An air flotation treatment box (4) is provided on one side of the fine filter box (1), and the end of the inlet pipe (2) away from the fine filter box (1) is connected to the interior of the air flotation treatment box (4).

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