A multi-layer filter structure for construction wastewater

Abstract

This application relates to the field of construction wastewater treatment technology, and in particular to a multi-layer filtration structure for construction wastewater, including a primary filtration mechanism, a fine filtration mechanism, a backwashing mechanism, and a collection tank; the primary filtration mechanism includes a filter tank, and stainless steel grids and sieve plates arranged sequentially from top to bottom on the inner wall of the filter tank; the fine filtration mechanism includes a fine filter cartridge arranged on the side of the filter tank, a limiting ring fixedly provided on the inner wall of the fine filter cartridge, and a sliding ring corresponding to the limiting ring slidably provided on the inner wall of the fine filter cartridge, and a stainless steel filter screen fixedly provided on the lower surface of the sliding ring; by setting up a primary filtration mechanism, a fine filtration mechanism, and a backwashing mechanism, this filtration structure can achieve staged filtration of construction wastewater with significantly improved efficiency, especially significantly improving the interception rate of small particles; moreover, the backwashing system effectively extends the service life of the filter cartridge; and the overall energy consumption is greatly reduced, and it supports long-term uninterrupted operation.

Description

Technical Field

[0001] This application relates to the field of construction wastewater treatment technology, and in particular to a multi-layer filtration structure for construction wastewater. Background Technology

[0002] The separation of solid impurities (such as sand, cement particles, and sludge) in construction wastewater mainly relies on physical filtration structures. Traditional structures struggle to simultaneously intercept large particles and capture fine particles. Current technological trends emphasize achieving staged filtration through structural optimization. Specific solutions using existing technologies include: Gravity settling structure: Inclined plates or honeycomb tubes are used to extend the water flow path, but the fixed plate spacing results in an escape rate of over 40% for particles smaller than 0.5mm. Stepped screen structure: Screens of different mesh sizes (20 mesh / 50 mesh / 100 mesh) are stacked vertically. Due to the lack of flow guidance design, the upper screens accumulate and become clogged. Cyclone separation structure: The built-in spiral guide vanes generate centrifugal force, but there is a risk of structural jamming for particles larger than 10mm.

[0003] In summary, existing filtration structures generally suffer from three major defects: First, rigidly connected multi-layer screens cannot adapt to changes in impurity load; second, turbulence in the interlayer transition area causes separated particles to be resuspended; and finally, the lack of a dynamic adjustment mechanism results in a penetration rate of up to 35% for small particles (<0.3mm).

[0004] Therefore, this application provides a multi-layer filtration structure for building wastewater. Summary of the Invention

[0005] The purpose of this application is to solve at least one technical problem raised in the background art.

[0006] This application provides a multi-layer filtration structure for building wastewater, including a primary filtration mechanism, a fine filtration mechanism, a backwashing mechanism, and a water collection tank; The primary filtration mechanism includes a filtration tank, and stainless steel grids and sieves arranged sequentially from top to bottom on the inner wall of the filtration tank. The fine filtration mechanism includes a fine filter cylinder disposed on the side of the filter tank. A limiting ring is fixedly provided on the inner wall of the fine filter cylinder. A sliding ring corresponding to the limiting ring is slidably disposed on the inner wall of the fine filter cylinder. A stainless steel filter screen is fixedly provided on the lower surface of the sliding ring. An inlet pipe and an outlet pipe are respectively provided on the outer surface of the fine filter cylinder. The backwashing mechanism includes three annular mounting grooves equidistantly opened on the inner wall of the fine filter cartridge, and an annular flushing pipe fixed on the inner wall of the annular mounting groove. The inner annular surface of the annular flushing pipe is fixed with six high-pressure flushing heads in a circumferential array. The outer surface of the fine filter cartridge is provided with a mountain-shaped connecting pipe. The three ends of the mountain-shaped connecting pipe extend into the interior of the three annular flushing pipes respectively. The backwashing mechanism also includes a high-pressure water pump fixed on the lower surface of the fine filter cartridge.

[0007] Preferably, the stainless steel grid is inclined at 15 degrees on the inner wall of the filter tank, a collection hopper corresponding to the bottom end of the stainless steel grid is fixed on the side of the filter tank, and a strip-shaped discharge port corresponding to the bottom end of the stainless steel grid and the top end of the collection hopper is opened on the inner wall of the filter tank.

[0008] By adopting the above technical solution, large particulate waste that has been intercepted and filtered by stainless steel grids can be effectively collected through the collection bucket.

[0009] Preferably, rectangular sliding grooves are provided on both inner walls of the filter pool, and sliding frames are slidably arranged on the inner walls of the two rectangular sliding grooves. The screen plate is fixed on the inner wall of the sliding frame, and the screen plate is a double-layered polyurethane screen.

[0010] By adopting the above technical solution, medium-sized particulate waste in wastewater can be effectively intercepted and filtered through double-layered polyurethane screens.

[0011] Preferably, a plurality of sliding rods are fixedly provided at equal intervals on the inner wall of the rectangular slide groove, and a sliding hole is provided on the upper surface of the sliding frame to slide and connect with the surface of the sliding rod. A vibration spring is sleeved on the surface of the sliding rod, one end of the vibration spring is fixedly connected to the lower surface of the sliding frame, and the other end of the vibration spring is fixedly connected to the inner bottom wall of the rectangular slide groove.

[0012] By adopting the above technical solution, the screen plate can be made to vibrate up and down under the action of the vibration spring.

[0013] Preferably, the bottom of the filter tank is fixed with four first support legs in a rectangular array, and the bottom of the fine filter cartridge is fixed with four second support legs in a rectangular array.

[0014] By adopting the above technical solution, the filter tank and the fine filter cartridge can be stably supported by the first support leg and the second support leg, respectively.

[0015] Preferably, one end of the inlet pipe extends to the inner bottom of the filter tank, the other end of the inlet pipe extends to the inner top of the fine filter cartridge, one end of the outlet pipe extends to the inner bottom of the fine filter cartridge, and the other end of the outlet pipe extends into the water collection tank.

[0016] By adopting the above technical solution, the wastewater filtered by the filter tank can be introduced into the fine filter cartridge through the inlet pipe, and the wastewater filtered by the fine filter cartridge can be introduced into the collection tank for collection through the outlet pipe.

[0017] Preferably, the top end of the fine filter cartridge is threadedly connected to a cartridge cover, and a handle is fixedly provided on the upper surface of the cartridge cover.

[0018] By adopting the above technical solution, the filter cartridge can be easily opened and closed by turning the cover with the operating handle.

[0019] Preferably, the high-pressure water pump has a suction pipe extending into the water collection tank at its inlet end, a water delivery pipe at its outlet end, and a connecting pipe connected to a mountain-shaped connecting pipe at its end.

[0020] By adopting the above technical solution, water in the collection tank can be transported to the mountain-shaped connecting pipe and three annular flushing pipes by a high-pressure water pump.

[0021] Preferably, the interior of the fine filter cartridge is provided with a drive mechanism for driving the stainless steel filter screen to vibrate up and down during backwashing. The drive mechanism includes a connecting cylinder disposed in the middle of the connecting pipe. A rotating shaft is rotatably disposed on the inner wall of the connecting cylinder. An impeller is disposed on the surface of the rotating shaft located inside the connecting cylinder. One end of the rotating shaft extends to the inner bottom of the fine filter cartridge. A plurality of eccentric discs for pushing the stainless steel filter screen are equidistantly disposed on the surface of the rotating shaft located inside the fine filter cartridge.

[0022] By adopting the above technical solution, during the process of the high-pressure water pump transporting water from the collection tank to the connecting pipe, the high-pressure water flow can drive the impeller in the connecting cylinder to rotate. The rotation of the impeller drives the rotating shaft to rotate, and the rotation of the rotating shaft drives the eccentric disc to push the stainless steel filter screen.

[0023] Preferably, the inner top wall of the cylinder cover is fixed with two symmetrical fixed cylinders, the inner wall of the fixed cylinder is provided with an annular sliding groove, the inner wall of the annular sliding groove is slidably provided with a sliding plate, the upper surface of the sliding ring is fixed with two symmetrical columns, the top ends of the two columns are respectively fixedly connected to the lower surface of the two sliding plates, the upper surface of the sliding plate is fixed with a return spring, and the top end of the return spring is fixedly connected to the inner top wall of the fixed cylinder.

[0024] By adopting the above technical solution, when the eccentric disc continuously pushes the stainless steel filter screen, and the stainless steel filter screen drives the sliding ring to move upward, the column can squeeze the sliding disc, causing the sliding disc to move upward. When the eccentric disc does not push the stainless steel filter screen, the sliding disc and the column can automatically reset under their own weight and the reaction force of the return spring, thereby realizing the up-and-down reciprocating vibration of the stainless steel filter screen, and thus enabling the high-pressure flushing head to more fully backwash the stainless steel filter screen.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The multi-layer filtration structure for construction wastewater described in this application, by setting up a primary filtration mechanism, a fine filtration mechanism, and a backwashing mechanism, allows wastewater to be added to the filtration tank during filtration. Large particles in the wastewater entering the filtration tank are first filtered by a stainless steel grid. Then, the wastewater undergoes intermediate filtration through a sieve plate to remove medium-sized particles. After that, the wastewater enters the fine filter cartridge through the inlet pipe, where it is finely filtered by the stainless steel filter screen to remove small particles. Finally, the wastewater is discharged into a collection tank through the outlet pipe. Moreover, after the wastewater enters the fine filter cartridge, a high-pressure water pump can be activated. The high-pressure water pump discharges water from the collection tank through a high-pressure flushing head on a ring flushing pipe to flush away debris attached to the stainless steel filter screen, preventing clogging. This allows the filtration structure to achieve graded filtration of construction wastewater with significantly improved efficiency, especially in the removal rate of small particles. Furthermore, the backwashing system effectively extends the service life of the filter cartridge, significantly reduces overall energy consumption, and supports long-term uninterrupted operation.

[0026] 2. The multi-layer filtration structure for building wastewater described in this application, by setting a drive mechanism, when the high-pressure water pump is started to backwash the stainless steel filter screen, during the process of the high-pressure water pump delivering water from the collection tank to the connecting pipe, the high-pressure water flow can drive the impeller in the connecting cylinder to rotate. The rotation of the impeller drives the rotating shaft to rotate, and the rotation of the rotating shaft drives the eccentric disk to push the stainless steel filter screen. Under the action of the return spring, the stainless steel filter screen is made to vibrate up and down, so that the high-pressure flushing head can backwash the stainless steel filter screen more thoroughly. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a rear view structural diagram of Embodiment 1 of this application; Figure 3 This is a schematic diagram of the cross-sectional structure of the filter tank in Embodiment 1 of this application; Figure 4 This is an enlarged structural diagram of point A in section 3 of this application; Figure 5 This is a schematic diagram of the internal structure of the fine filter cartridge in Embodiment 1 of this application; Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of this application; Figure 7 This is a schematic diagram of the bottom cross-sectional structure of the fine filter cartridge in Embodiment 2 of this application; Figure 8 This application Figure 7 Enlarged structural diagram at point B; Figure 9 This is a side sectional view of the fine filter cartridge in Embodiment 2 of this application; Figure 10 This application Figure 9 Enlarged structural diagram at point C.

[0028] Explanation of reference numerals in the attached figures: 100. Primary filtration mechanism; 101. Filter tank; 102. Stainless steel grating; 103. Screen plate; 104. Collection hopper; 105. Sliding frame; 106. Slide rod; 107. Vibration spring; 108. First support leg; 200. Fine filtration mechanism; 201. Fine filter cartridge; 202. Limiting ring; 203. Sliding ring; 204. Stainless steel filter screen; 205. Inlet pipe; 206. Outlet pipe; 207. Second support leg; 208. Cartridge cover; 300. Backwashing mechanism; 301. Annular flushing pipe; 302. High-pressure flushing head; 303. Mountain-shaped connecting pipe; 304. High-pressure water pump; 305. Suction pipe; 306. Water delivery pipe; 307. Connecting pipe; 400. Catchment pool; 500. Drive mechanism; 501. Connecting cylinder; 502. Rotating shaft; 503. Impeller; 504. Eccentric disc; 505. Fixed cylinder; 506. Slide plate; 507. Column; 508. Return spring. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 To be continued Figure 10 This application will be described in further detail below. Example

[0030] Please refer to Figures 1 to 5A multi-layer filtration structure for construction wastewater includes a primary filtration unit 100, a fine filtration unit 200, a backwashing unit 300, and a collection tank 400. The primary filtration unit 100 includes a filter tank 101, and a stainless steel grid 102 and a sieve plate 103 arranged sequentially from top to bottom on the inner wall of the filter tank 101. The fine filtration unit 200 includes a fine filter cylinder 201 arranged on the side of the filter tank 101. A limiting ring 202 is fixedly provided on the inner wall of the fine filter cylinder 201, and a sliding ring 203 corresponding to the limiting ring 202 is slidably arranged on the inner wall of the fine filter cylinder 201. A stainless steel filter screen 20 is fixedly provided on the lower surface of the sliding ring 203. 4. The outer surface of the fine filter cartridge 201 is provided with an inlet pipe 205 and an outlet pipe 206 respectively; the backwashing mechanism 300 includes three annular mounting grooves equidistantly opened on the inner wall of the fine filter cartridge 201, and an annular flushing pipe 301 fixed on the inner wall of the annular mounting groove. The inner annular surface of the annular flushing pipe 301 is provided with six high-pressure flushing heads 302 in a circumferential array. The outer surface of the fine filter cartridge 201 is provided with a mountain-shaped connecting pipe 303. The three ends of the mountain-shaped connecting pipe 303 extend into the interior of the three annular flushing pipes 301 respectively. The backwashing mechanism 300 also includes a high-pressure water pump 304 fixed on the lower surface of the fine filter cartridge 201.

[0031] Please see Figure 2 , Figure 3 The stainless steel grating 102 is inclined at 15 degrees on the inner wall of the filter tank 101. The side of the filter tank 101 is fixed with a collection hopper 104 corresponding to the bottom of the stainless steel grating 102. The inner wall of the filter tank 101 is provided with a strip-shaped discharge port corresponding to the bottom of the stainless steel grating 102 and the top of the collection hopper 104.

[0032] Specifically, it can effectively collect large particulate waste that has been intercepted and filtered by the stainless steel grid 102 through the collection bucket 104.

[0033] Please see Figure 3 , Figure 4 The filter tank 101 has rectangular sliding grooves on both sides of its inner wall. Sliding frames 105 are slidably installed on the inner wall of the two rectangular sliding grooves. The sieve plate 103 is fixed on the inner wall of the sliding frame 105. The sieve plate 103 is a double-layered polyurethane sieve.

[0034] Specifically, the filter can effectively intercept and filter medium-sized particulate waste in wastewater through a double-layered polyurethane screen. The outer surface of the filter tank 101 is provided with a discharge gate for discharging the medium-sized particulate debris intercepted and filtered by the screen plate 103.

[0035] Please see Figure 3 , Figure 4A plurality of slide rods 106 are fixedly fixed at equal intervals on the inner wall of the rectangular slide groove. The upper surface of the sliding frame 105 is provided with sliding holes that are slidably connected to the surface of the slide rods 106. A vibration spring 107 is sleeved on the surface of the slide rods 106. One end of the vibration spring 107 is fixedly connected to the lower surface of the sliding frame 105, and the other end of the vibration spring 107 is fixedly connected to the inner bottom wall of the rectangular slide groove. A vibration motor is also provided on the lower surface of the sliding frame 105.

[0036] Specifically, the screen plate 103 can vibrate up and down under the action of the vibrating spring 107.

[0037] Please see Figure 2 , Figure 3 The bottom of the filter tank 101 is fixed with four first support legs 108 in a rectangular array, and the bottom of the fine filter cartridge 201 is fixed with four second support legs 207 in a rectangular array.

[0038] Specifically, the filter tank 101 and the fine filter cartridge 201 can be stably supported by the first support leg 108 and the second support leg 207, respectively.

[0039] Please see Figure 3 , Figure 5 One end of the inlet pipe 205 extends to the bottom of the filter tank 101, and the other end of the inlet pipe 205 extends to the top of the fine filter cartridge 201. One end of the outlet pipe 206 extends to the bottom of the fine filter cartridge 201, and the other end of the outlet pipe 206 extends into the water collection tank 400.

[0040] Specifically, the wastewater filtered by the filter tank 101 can be introduced into the fine filter cartridge 201 through the inlet pipe 205, and the wastewater filtered by the fine filter cartridge 201 can be introduced into the collection tank 400 for collection through the outlet pipe 206.

[0041] Please see Figure 3 , Figure 5 The top of the fine filter cartridge 201 is threadedly connected to a cartridge cover 208, and a handle is fixedly provided on the upper surface of the cartridge cover 208.

[0042] Specifically, the fine filter cartridge 201 can be easily opened and closed by turning the cover 208 using the operating handle.

[0043] Please see Figure 3 , Figure 5 The high-pressure water pump 304 has a suction pipe 305 extending into the water collection tank 400 at its inlet end, and a water delivery pipe 306 at its outlet end. The end of the water delivery pipe 306 is connected to a connecting pipe 307 that communicates with the mountain-shaped connecting pipe 303.

[0044] Specifically, the high-pressure water pump 304 can transport water from the collection tank 400 to the mountain-shaped connecting pipe 303 and the three annular flushing pipes 301.

[0045] In this embodiment, by setting up a primary filtration mechanism 100, a fine filtration mechanism 200, and a backwashing mechanism 300, when filtering construction wastewater, the wastewater can be added into the filter tank 101. Large particles of wastewater entering the filter tank 101 are first filtered by the stainless steel grid 102. Then, the wastewater undergoes intermediate filtration through the sieve plate 103 to remove medium-sized particles. After that, the wastewater enters the fine filter cartridge 201 through the inlet pipe 205, where it is finely filtered by the stainless steel filter screen 204 to remove small particles. Finally, the wastewater is discharged through the outlet pipe 206. The wastewater is collected in the collection tank 400. After entering the fine filter cartridge 201, the high-pressure water pump 304 is activated. The high-pressure water pump 304 discharges the water in the collection tank 400 through the high-pressure flushing head 302 on the annular flushing pipe 301, flushing away the debris attached to the stainless steel filter screen 204 and preventing clogging. This allows the filtration structure to achieve graded filtration of construction wastewater with significantly improved efficiency, especially in the removal rate of small particles. Moreover, the backwashing system effectively extends the service life of the filter cartridge, and the overall energy consumption is greatly reduced, while supporting long-term uninterrupted operation. Example

[0046] Based on Example 1, referring to Figures 6 to 10 And unlike Example 1, the following is true: Please see Figure 7 , Figure 8 The fine filter cartridge 201 is equipped with a drive mechanism 500 for driving the stainless steel filter screen 204 to vibrate up and down during backwashing. The drive mechanism 500 includes a connecting cylinder 501 located in the middle of the connecting pipe 307. A rotating shaft 502 is rotatably mounted on the inner wall of the connecting cylinder 501. An impeller 503 is mounted on the surface of the rotating shaft 502 located inside the connecting cylinder 501. One end of the rotating shaft 502 extends to the inner bottom of the fine filter cartridge 201. Several eccentric discs 504 for pushing the stainless steel filter screen 204 are equidistantly mounted on the surface of the rotating shaft 502 located inside the fine filter cartridge 201.

[0047] Specifically, during the process of the high-pressure water pump 304 transporting water from the collection tank 400 to the connecting pipe 307, the high-pressure water flow can drive the impeller 503 in the connecting cylinder 501 to rotate. The rotation of the impeller 503 drives the rotating shaft 502 to rotate, and the rotation of the rotating shaft 502 drives the eccentric disc 504 to push the stainless steel filter screen 204.

[0048] Please see Figure 9 , Figure 10The inner top wall of the cylinder cover 208 is fixed with two symmetrical fixed cylinders 505. The inner wall of the fixed cylinder 505 is provided with an annular sliding groove. The inner wall of the annular sliding groove is slidably provided with a sliding plate 506. The upper surface of the sliding ring 203 is fixed with two symmetrical columns 507. The top ends of the two columns 507 are respectively fixedly connected to the lower surface of the two sliding plates 506. The upper surface of the sliding plate 506 is fixed with a return spring 508. The top end of the return spring 508 is fixedly connected to the inner top wall of the fixed cylinder 505.

[0049] Specifically, during the continuous pushing of the eccentric disc 504 against the stainless steel filter screen 204, when the stainless steel filter screen 204 drives the sliding ring 203 to move upward, it can squeeze the sliding plate 506 through the column 507, causing the sliding plate 506 to move upward. When the eccentric disc 504 does not push the stainless steel filter screen 204, the sliding plate 506 and the column 507 can automatically reset under their own weight and the reaction action of the return spring 508, thereby realizing the up-and-down reciprocating vibration of the stainless steel filter screen 204, so that the high-pressure flushing head 302 can more fully backwash the stainless steel filter screen 204.

[0050] In this embodiment, by setting a drive mechanism 500, when the high-pressure water pump 304 is started to backwash the stainless steel filter screen 204, the high-pressure water pump 304 delivers water from the water collection tank 400 to the connecting pipe 307. During this process, the high-pressure water flow can drive the impeller 503 in the connecting cylinder 501 to rotate. The rotation of the impeller 503 drives the rotating shaft 502 to rotate. The rotation of the rotating shaft 502 drives the eccentric disk 504 to push the stainless steel filter screen 204. Under the action of the return spring 508, the stainless steel filter screen 204 vibrates up and down, so that the high-pressure flushing head 302 can backwash the stainless steel filter screen 204 more thoroughly.

[0051] Working principle: When filtering construction wastewater, the wastewater can be added to the filter tank 101. Large particles in the wastewater entering the filter tank 101 are first filtered by the stainless steel grid 102. Then, the wastewater undergoes intermediate filtration through the screen plate 103 to remove medium-sized particles. After that, the wastewater enters the fine filter cartridge 201 through the inlet pipe 205, where it is finely filtered by the stainless steel filter screen 204 to remove small particles. Finally, the wastewater is discharged into the collection tank 400 through the outlet pipe 206. After the wastewater enters the fine filter cartridge 201, the high-pressure water pump 304 can be activated. The high-pressure water pump 304 discharges water from the collection tank 400 through the high-pressure flushing head 302 on the annular flushing pipe 301 to flush away debris adhering to the stainless steel filter screen 204 and prevent clogging. The filter structure is designed to perform graded filtration of construction wastewater with significantly improved efficiency, especially in the removal of small particles. The backwashing system effectively extends the lifespan of the filter cartridge and significantly reduces overall energy consumption. It also supports continuous operation for extended periods. When the high-pressure water pump 304 is started to backwash the stainless steel filter screen 204, the high-pressure water pump 304 delivers water from the collection tank 400 to the connecting pipe 307. The high-pressure water flow drives the impeller 503 in the connecting cylinder 501 to rotate. The rotation of the impeller 503 drives the rotating shaft 502 to rotate, which in turn drives the eccentric disc 504 to push against the stainless steel filter screen 204. Under the action of the return spring 508, the stainless steel filter screen 204 vibrates up and down, allowing the high-pressure flushing head 302 to more thoroughly backwash the stainless steel filter screen 204.

Claims

1. A multi-layer filtration structure for construction wastewater, characterized in that, It includes a primary filtration unit (100), a fine filtration unit (200), a backwashing unit (300), and a water collection tank (400). The primary filtration mechanism (100) includes a filter tank (101) and a stainless steel grid (102) and a sieve plate (103) arranged sequentially from top to bottom on the inner wall of the filter tank (101). The fine filtration mechanism (200) includes a fine filter cylinder (201) disposed on the side of the filter tank (101). A limiting ring (202) is fixedly provided on the inner wall of the fine filter cylinder (201). A sliding ring (203) corresponding to the limiting ring (202) is slidably disposed on the inner wall of the fine filter cylinder (201). A stainless steel filter screen (204) is fixedly provided on the lower surface of the sliding ring (203). An inlet pipe (205) and an outlet pipe (206) are respectively provided on the outer surface of the fine filter cylinder (201). The backwashing mechanism (300) includes three annular mounting grooves equidistantly opened on the inner wall of the fine filter cartridge (201), and an annular flushing pipe (301) fixed on the inner wall of the annular mounting groove. The inner annular surface of the annular flushing pipe (301) is fixed with six high-pressure flushing heads (302) in a circumferential array. The outer surface of the fine filter cartridge (201) is provided with a mountain-shaped connecting pipe (303). The three ends of the mountain-shaped connecting pipe (303) extend into the interior of the three annular flushing pipes (301). The backwashing mechanism (300) also includes a high-pressure water pump (304) fixed on the lower surface of the fine filter cartridge (201).

2. The multi-layer filtration structure for building wastewater according to claim 1, characterized in that, The stainless steel grid (102) is inclined at 15 degrees on the inner wall of the filter tank (101). The side of the filter tank (101) is fixed with a collection hopper (104) corresponding to the bottom of the stainless steel grid (102), and the inner wall of the filter tank (101) is provided with a strip-shaped discharge port corresponding to the bottom of the stainless steel grid (102) and the top of the collection hopper (104).

3. The multi-layer filtration structure for building wastewater according to claim 1, characterized in that, The filter pool (101) has rectangular sliding grooves on both sides of its inner wall. Sliding frames (105) are slidably installed on the inner walls of the two rectangular sliding grooves. The sieve plate (103) is fixed on the inner wall of the sliding frame (105). The sieve plate (103) is a double-layered polyurethane sieve.

4. The multi-layer filtration structure for building wastewater according to claim 3, characterized in that, The inner wall of the rectangular slide groove is fixedly provided with a plurality of slide rods (106) at equal intervals. The upper surface of the sliding frame (105) is provided with a sliding hole that is slidably connected to the surface of the slide rods (106). A vibration spring (107) is sleeved on the surface of the slide rods (106). One end of the vibration spring (107) is fixedly connected to the lower surface of the sliding frame (105), and the other end of the vibration spring (107) is fixedly connected to the inner bottom wall of the rectangular slide groove.

5. A multi-layer filtration structure for building wastewater according to claim 1, characterized in that, The bottom of the filter tank (101) is fixed with four first support legs (108) in a rectangular array, and the bottom of the fine filter cartridge (201) is fixed with four second support legs (207) in a rectangular array.

6. The multi-layer filtration structure for building wastewater according to claim 1, characterized in that, One end of the inlet pipe (205) extends to the bottom of the filter tank (101), and the other end of the inlet pipe (205) extends to the top of the fine filter cartridge (201). One end of the outlet pipe (206) extends to the bottom of the fine filter cartridge (201), and the other end of the outlet pipe (206) extends into the water collection tank (400).

7. A multi-layer filtration structure for building wastewater according to claim 6, characterized in that, The top of the fine filter cartridge (201) is threadedly connected to a cartridge cover (208), and a handle is fixedly provided on the upper surface of the cartridge cover (208).

8. A multi-layer filtration structure for building wastewater according to claim 7, characterized in that, The high-pressure water pump (304) has a suction pipe (305) extending into the water collection tank (400) at its inlet end, and a water delivery pipe (306) at its outlet end. The end of the water delivery pipe (306) is provided with a connecting pipe (307) that communicates with the mountain-shaped connecting pipe (303).

9. A multi-layer filtration structure for building wastewater according to claim 8, characterized in that, The fine filter cartridge (201) is equipped with a drive mechanism (500) for driving the stainless steel filter screen (204) to vibrate up and down during backwashing. The drive mechanism (500) includes a connecting cylinder (501) located in the middle of the connecting pipe (307). A rotating shaft (502) is rotatably arranged on the inner wall of the connecting cylinder (501). An impeller (503) is arranged on the surface of the rotating shaft (502) located inside the connecting cylinder (501). One end of the rotating shaft (502) extends to the inner bottom of the fine filter cartridge (201). Several eccentric disks (504) for pushing the stainless steel filter screen (204) are equidistantly arranged on the surface of the rotating shaft (502) located inside the fine filter cartridge (201).

10. A multi-layer filtration structure for building wastewater according to claim 9, characterized in that, The inner top wall of the cylinder cover (208) is fixed with two symmetrical fixed cylinders (505). The inner wall of the fixed cylinder (505) is provided with an annular sliding groove. The inner wall of the annular sliding groove is slidably provided with a sliding plate (506). The upper surface of the sliding ring (203) is fixed with two symmetrical columns (507). The top ends of the two columns (507) are respectively fixedly connected to the lower surface of the two sliding plates (506). The upper surface of the sliding plate (506) is fixed with a return spring (508). The top end of the return spring (508) is fixedly connected to the inner top wall of the fixed cylinder (505).

Images