Deep bed filter overflow and backwashing system and process

Abstract

The invention discloses a deep bed filter tank overflow and backwashing system and process, and belongs to the technical field of filter tanks. An overflow and backwashing system of a deep-bed filter tank comprises a tank body, a hollow plate in a suspended state is fixedly connected to the bottom of the tank body, a filter material is laid at the upper end of the hollow plate, the overflow and backwashing system further comprises a waste water pipe fixedly connected to the outer wall of the tank body, the waste water pipe is flush with the upper end face of the filter material, and the filter material is arranged on the outer wall of the tank body. An overflow pipe is fixedly connected to the upper end of the tank body; first valves are mounted on the wastewater pipe and the overflow pipe; the strip-shaped plate is transversely mounted at the inner bottom of the tank body in a sliding manner, a strip-shaped water outlet groove is formed in an upper end opening of the strip-shaped plate, and a water inlet pipe is fixedly connected to the outer wall of the tank body; according to the invention, secondary lifting of sewage by using a lifting pump is not needed, the consumption of resources is reduced, and the backwashing effect can be remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of filter tanks, and in particular to an overflow and backwashing system and process for a deep bed filter tank. Background Art

[0002] A deep bed filter is a type of filtration equipment used for water treatment. Its characteristic is that it uses a thicker filter layer to remove suspended solids, organic matter and other impurities in the water. This type of filter is widely used in drinking water treatment, wastewater treatment and other fields due to its high filtration efficiency and long filtration cycle. In order to ensure the filtration efficiency, the deep bed filter needs to be backwashed regularly to keep the filter layer capable of filtering sewage.

[0003] In the prior art, when backwashing the filter layer, clean water is mainly directly delivered to the bottom of the filter tank, so that the clean water flows to the upper end surface of the filter tank to flush out the impurities in the filter layer. During this period, due to the large area of ​​the filter tank, the backwashing water pressure is relatively dispersed, which will result in low backwashing efficiency and indirectly affect the water treatment efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the backwashing water pressure is relatively dispersed due to the large area of ​​the filter tank, and to propose a deep bed filter overflow and backwashing system and process.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A deep bed filter overflow and backwash system comprises a tank body, the bottom of which is fixedly connected to a suspended hollow plate, the upper end of which is provided with filter material, and further comprises: a waste water pipe, fixedly connected to the outer wall of the tank body, wherein the waste water pipe is flush with the upper end surface of the filter material, the upper end of the tank body is fixedly connected to an overflow pipe, and a first valve is installed on both the waste water pipe and the overflow pipe; a strip plate, laterally slidably installed on the inner bottom of the tank body, wherein the upper end of the strip plate is provided with a strip water outlet trough, the outer wall of the tank body is fixedly connected to a water inlet pipe, the output end of the water inlet pipe is fixedly connected to a hose extending into the water outlet trough, and the outer wall of the tank body is provided with a driving part for driving the strip plate to reciprocate.

[0007] In order to improve the backwashing effect of the filter tank, preferably, the driving part includes a reciprocating screw rotatably connected to the outer wall of the tank body, the outer wall of the reciprocating screw is equipped with a reciprocating slider slidably connected to the outer wall of the tank body, the reciprocating slider is connected to the strip plate through a magnetic attraction part, and a driving motor for driving the reciprocating screw to rotate is fixedly installed on the tank body.

[0008] In order to facilitate the reciprocating slide plate to drive the strip plate to slide reciprocatingly, further, the magnetic attraction portion includes a first magnet fixedly connected to the reciprocating slide block, and a second magnet attracted to the first magnet is fixedly mounted on the strip plate.

[0009] In order to separate the filter material into multiple groups, further, a plurality of isolation plates arranged at equal intervals are fixedly connected to the hollow plate, and a plurality of isolation grooves are formed on the upper end of the hollow plate under the action of the isolation plates. The filter material is filled in the plurality of isolation grooves, and the width of the strip plate is greater than or equal to the width of the isolation grooves.

[0010] In order to discharge the sewage into the tank body more evenly, further, a mounting frame is fixedly connected to the reciprocating slider, and a sewage pipe located at the upper port of the tank body is fixedly mounted on the mounting frame.

[0011] In order to prevent the sewage from causing secondary pollution to the filter material, further, a top plate located on the top of the isolation plate is fixedly connected to the pool body, and a plurality of wide grooves corresponding to the isolation grooves are provided at the bottom of the top plate, and a narrow groove connected to the wide groove is provided at the upper end of the isolation plate, wherein a baffle flush with the upper end surface of the top plate is provided in the narrow groove, and a cross frame is fixedly connected in the wide groove, and a pillar is longitudinally slidably connected to the cross frame, and the baffle is fixedly connected to the pillar, and a first spring is installed between the baffle and the cross frame.

[0012] In order to improve the efficiency of sewage discharge from the pool body, further, a horizontal pipe is provided on the top of the top plate and is slidably connected to the inner wall of the pool body. Nozzles are fixedly installed on both sides of the horizontal pipe. The spraying direction of the nozzle is parallel to the upper end surface of the top plate. Wastewater pipes are provided on both sides of the pool body. A third magnet is fixedly connected to the horizontal pipe, and a fourth magnet attracted to the third magnet is fixedly connected to the reciprocating slider.

[0013] In order to effectively loosen the filter material during backwashing, further, a sleeve is fixedly connected to the upper end of the hollow plate, a column is longitudinally slidably installed in the sleeve, and a lifting part is provided in the water outlet trough for the column to rise and fall in the sleeve.

[0014] In order to enable the column to be lifted up and down, the lifting part further includes an active magnet fixedly connected to the water outlet trough, a driven magnet that repels the active magnet is fixedly installed at the lower end of the column, and a second spring is installed between the column and the bottom of the sleeve.

[0015] A backwashing process for a deep bed filter, the operating steps are as follows:

[0016] Step 1: Open the first valve on the waste water pipe;

[0017] Step 2: transport the backwash water into the water inlet pipe;

[0018] Step 3: Make the strip plate slide back and forth at the bottom of the pool body;

[0019] Step 4: During the movement of the strip plate, the baffles in the plurality of narrow grooves are lifted up in turn;

[0020] Step 5: Discharge the backwash wastewater from the pool through the wastewater pipe.

[0021] Compared with the prior art, the present invention provides a deep bed filter overflow and backwashing system, which has the following beneficial effects:

[0022] 1. The overflow and backwash system of the deep bed filter extends the ends of the overflow pipe and the wastewater pipe into the secondary sedimentation tank. Therefore, the excess sewage in the tank body can enter the sedimentation tank to prevent the overflow of scattered water in the plant area. The sewage generated by backwashing can also be directly discharged into the secondary sedimentation tank through the wastewater pipe. Therefore, there is no need to use a lifting pump to lift the sewage for a second time, reducing resource consumption.

[0023] 2. The overflow and backwashing system of the deep bed filter is equipped with strip plates, so the pressure of the backwashing water will be concentrated in the water outlet tank, thereby improving the efficiency and effect of backwashing. The reciprocating slider will drive the strip plates to slide back and forth at the bottom of the tank body, and the water outlet tank will perform comprehensive backwashing on the filter material.

[0024] 3. The overflow and backwashing system of the deep bed filter is provided with isolation plates, so that the filter material will be equally divided into the isolation grooves formed by multiple isolation plates. When the two sides of the strip plate are aligned with the two isolation plates respectively, the backwashing water discharged from the outlet trough will concentrate on flushing the filter material in the isolation groove, thereby making the flushing water pressure more concentrated and the backwashing effect better.

[0025] 4. The overflow and backwashing system of the deep bed filter is equipped with baffles. Therefore, during backwashing, the concentrated water flow will cause one or two adjacent baffles to lift upward, while the other baffles are basically unaffected by the water pressure. The sewage generated by backwashing will flow along the upper end surface of the top plate to the wastewater pipe, and the sewage will not secondarily pollute other unwashed filter materials, further improving the backwashing effect.

[0026] 5. The overflow and backwashing system of the deep bed filter moves the active magnet to the bottom of the driven magnet through the strip plate. The driven magnet will slide upward under the repulsive force between the two, thereby driving the column to slide upward. When the active magnet and the driven magnet deviate from each other, the second spring will drive the column to move downward and reset. The column moving up and down will loosen the filter material, so that it can achieve a better backwashing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1A schematic diagram of the axonometric structure of a deep bed filter overflow and backwashing system proposed by the present invention from a first perspective;

[0028] Figure 2 A schematic diagram of the axonometric structure from a second perspective of an overflow and backwashing system for a deep bed filter proposed by the present invention;

[0029] Figure 3 A partial isometric structural schematic diagram of a deep bed filter overflow and backwashing system proposed by the present invention;

[0030] Figure 4 A partial cross-sectional structural schematic diagram of a deep bed filter overflow and backwashing system proposed by the present invention;

[0031] Figure 5 A deep bed filter overflow and backwashing system proposed by the present invention Figure 4 Schematic diagram of the structure of part A;

[0032] Figure 6 This is a schematic diagram of the axonometric structure of a strip plate of a deep bed filter overflow and backwashing system proposed by the present invention;

[0033] Figure 7 This is a schematic diagram of the axonometric structure of a reciprocating slider of a deep bed filter overflow and backwashing system proposed by the present invention;

[0034] Figure 8 This is a schematic diagram of the transverse pipe axonometric structure of a deep bed filter overflow and backwashing system proposed by the present invention.

[0035] In the figure: 1, pool body; 2, hollow plate; 3, filter material; 4, waste water pipe; 5, overflow pipe; 6, first valve; 7, drain pipe; 8, second valve; 9, water inlet pipe; 10, strip plate; 11, water outlet trough; 12, hose; 13, reciprocating screw; 14, reciprocating slider; 15, drive motor; 16, first magnet; 17, second magnet; 18, cross pipe; 19, nozzle; 20, third magnet; 21, fourth magnet; 22, top plate; 23, isolation plate; 24, wide groove; 25, narrow groove; 26, cross frame; 27, baffle; 28, first spring; 29, pillar; 30, column; 31, sleeve; 32, second spring; 33, driven magnet; 34, active magnet; 35, sewage pipe; 36, mounting frame. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Embodiment 1:

[0039] Reference Figure 1-Figure 8 A deep bed filter overflow and backwashing system comprises a tank body 1 with a drain pipe 7 at the bottom, and a second valve 8 is fixedly installed on the drain pipe 7. A hollow plate 2 in a suspended state is fixedly connected to the bottom of the tank body 1, and a mesh is provided on the hollow plate 2. A filter material 3 for filtering sewage is laid on the upper end of the hollow plate 2. The filter material 3 is granular and cannot pass through the mesh on the hollow plate 2. It also includes: a wastewater pipe 4 for discharging backwashing sewage, which is fixedly connected to the outer wall of the tank body 1, wherein the wastewater pipe 4 and the upper surface of the filter material 3 are connected. The end faces are flush, and an overflow pipe 5 is fixedly connected to the upper end of the pool body 1, and a first valve 6 is installed on the waste water pipe 4 and the overflow pipe 5; a strip plate 10 is horizontally slidably installed on the inner bottom of the pool body 1, wherein a strip water outlet trough 11 is provided at the upper end of the strip plate 10, and the water outlet trough 11 faces the lower end of the filter material 3, and an inlet pipe 9 is fixedly connected to the outer wall of the pool body 1, and a hose 12 extending into the water outlet trough 11 is fixedly connected to the output end of the inlet pipe 9, and a driving part for driving the strip plate 10 to move back and forth is provided on the outer wall of the pool body 1.

[0040] Specifically, when in use, the ends of the overflow pipe 5 and the wastewater pipe 4 are extended into the secondary sedimentation tank. When the liquid level in the tank body 1 is high, excess sewage can enter the sedimentation tank to prevent overflow of scattered water in the factory area. When backwashing the filter material 3 in the tank body 1, the first valve 6 on the wastewater pipe 4 is opened, so that the sewage generated by backwashing can also be directly discharged into the secondary sedimentation tank. Therefore, there is no need to use a lifting pump to lift the sewage for a second time, thereby reducing resource consumption.

[0041] In reality, the backwash wastewater from the deep bed filter is directly discharged into the plant network and then returned to the plant's lift pump pool. However, the backwash wastewater is treated at the front end and only needs secondary sedimentation to meet the standards. It is estimated that the four groups of filters have about 2,000 cubic meters of backwash wastewater per day, which is returned to the lift pump room for secondary lifting, which not only increases power consumption and equipment loss, but also occupies the volume of the oxidation ditch and reduces the system's processing capacity. In order to explore effective measures such as energy conservation, consumption reduction, quality improvement and efficiency enhancement, the plant plans to add a filter wastewater pipe 4 and an overflow pipe 5 to the secondary sedimentation tank to reduce the related losses caused by the increase in wastewater reflux, ensure the centralized collection and disposal of overflow water in emergency situations such as filter blockage, and ensure that there is no overflow of bulk water in the pool 1.

[0042] When the filter material 3 needs to be backwashed, the backwash water is transported to the water inlet pipe 9. After being transported by the hose 12, the backwash water will be transported from the water outlet 11 on the strip plate 10 to the bottom of the hollow plate 2 and the filter material 3, thereby achieving the backwashing effect. Since the backwash water is restricted by the water outlet 11, the pressure of the backwash water will be concentrated in the water outlet 11, thereby improving the efficiency and effect of the backwashing. During this period, the driving unit will drive the strip plate 10 to slide back and forth at the bottom of the pool body 1, and the water outlet 11 will perform a comprehensive backwashing operation on the filter material 3.

[0043] Embodiment 2:

[0044] Reference Figure 1-Figure 7 , which is basically the same as the first embodiment, and further discloses a specific implementation scheme of the driving unit.

[0045] The above-mentioned driving part includes a reciprocating screw 13 rotatably connected to the outer wall of the pool body 1, and the outer wall of the reciprocating screw 13 is equipped with a reciprocating slider 14 slidably connected to the outer wall of the pool body 1. When the reciprocating screw 13 continues to rotate, the reciprocating slider 14 can slide back and forth along its surface. The reciprocating slider 14 is connected to the strip plate 10 through a magnetic attraction part, and the magnetic attraction part includes a first magnet 16 fixedly connected to the reciprocating slider 14. A second magnet 17 attracted to the first magnet 16 is fixedly installed on the strip plate 10. The first magnet 16 and the second magnet 17 are permanent magnets or electromagnets. A driving motor 15 for driving the reciprocating screw 13 to rotate is fixedly installed on the pool body 1.

[0046] Specifically, when the filter material 3 needs to be backwashed, the drive motor 15 is started, the drive motor 15 will drive the reciprocating screw 13 to rotate, and the reciprocating screw 13 will drive the reciprocating slider 14 to rotate, the reciprocating slider 14 will drive the second magnet 17 to slide synchronously through the first magnet 16, and the second magnet 17 will drive the strip plate 10 to slide back and forth at the bottom of the pool body 1, and the water outlet trough 11 will perform a comprehensive backwashing operation on the filter material 3.

[0047] The above-mentioned hollow plate 2 is fixedly connected to a plurality of isolation plates 23 arranged at equal intervals, the number of the isolation plates 23 is 6-18, and the preferred number in this application is 9. The upper end of the hollow plate 2 forms a plurality of isolation grooves under the action of the isolation plates 23, and the filter material 3 is filled in the plurality of isolation grooves. The width of the strip plate 10 is greater than or equal to the width of the isolation groove.

[0048] Due to the setting of the isolation plate 23, the filter material 3 will be equally divided into the isolation groove formed by multiple isolation plates 23. When the two sides of the strip plate 10 are aligned with the two isolation plates 23 respectively, or when the strip plate 10 is aligned with the lower port of the isolation groove, the backwash water discharged from the outlet trough 11 will concentrate on flushing the filter material 3 in the isolation groove, thereby making the flushing water pressure more concentrated and the backwashing effect better.

[0049] The reciprocating slider 14 is fixedly connected with a mounting frame 36 , and a sewage pipe 35 located at an upper end of the tank body 1 is fixedly mounted on the mounting frame 36 .

[0050] Specifically, when discharging sewage into the pool body 1, the sewage enters the sewage pipe 35 and is discharged into the pool body 1 through the sewage pipe 35. At this time, the driving motor 15 is started, and the reciprocating slider 14 will drive the sewage pipe 35 to slide back and forth along the pool body 1 through the mounting frame 36, so that the sewage can be evenly infused into the pool body 1 to ensure the filtering effect of the filter material 3.

[0051] Embodiment three:

[0052] Reference Figure 3-Figure 6 , which is basically the same as the second embodiment, and further, a specific implementation scheme for preventing the filter material 3 from being contaminated again is specifically added.

[0053] The above-mentioned pool body 1 is fixedly connected with a top plate 22 located on the top of the isolation plate 23, and the bottom of the top plate 22 is provided with a plurality of wide grooves 24 corresponding to the isolation grooves, and the upper end of the isolation plate 23 is provided with a narrow groove 25 connected to the wide groove 24, and the width of the wide groove 24 is greater than the narrow groove 25, wherein a baffle 27 flush with the upper end surface of the top plate 22 is provided in the narrow groove 25, and the area of ​​the baffle 27 is the same as that of the narrow groove 25, and a cross frame 26 is fixedly connected in the wide groove 24, and a pillar 29 is longitudinally slidably connected to the cross frame 26, and the baffle 27 is fixedly connected to the pillar 29, and a first spring 28 is installed between the baffle 27 and the cross frame 26.

[0054] Specifically, when there is a large amount of sewage to be filtered in the pool body 1, the flow pressure of the sewage will push the baffle 27 downward. At this time, the first spring 28 will be compressed, and the sewage will enter the wide groove 24 through the narrow groove 25, and then enter the filter material 3 for filtration. When the filter material 3 in the pool body 1 is backflushed, the water flow will flow upward, and the flowing water pressure will push the baffle 27 upward. The backwashed sewage will first enter the wide groove 24, and then pass through the narrow groove 25 and flow to the upper end surface of the top plate 22. Due to the setting of the isolation plate 23, the concentrated water flow will cause one or two baffles 27 in adjacent positions to push upward, while the other baffles 27 are basically not affected by the water pressure and will not push upward. Therefore, the sewage generated by the backwashing will flow along the upper end surface of the top plate 22 to the wastewater pipe 4, and the sewage will not secondary pollute other unflushed filter materials 3, further improving the backwashing effect.

[0055] Embodiment 4:

[0056] Reference Figure 4 as well as Figure 6-Figure 8 , which is basically the same as Example 3, and further, a specific implementation plan for improving sewage discharge efficiency is specifically added.

[0057] The top of the top plate 22 is provided with a transverse tube 18 which is slidably connected to the inner wall of the pool body 1. A movable gap is provided between the transverse tube 18 and the top of the top plate 22 to facilitate the lifting of the baffle 27. Nozzles 19 for spraying flushing liquid are fixedly installed on both sides of the transverse tube 18. The spraying direction of the nozzle 19 is parallel to the upper end surface of the top plate 22. Waste water pipes 4 are provided on both sides of the pool body 1. The transverse tube 18 is fixedly connected to the third magnet 20. The reciprocating slider 14 is fixedly connected to the fourth magnet 21 which is attracted to the third magnet 20. The third magnet 20 and the fourth magnet 21 are both permanent magnets or electromagnets.

[0058] Specifically, when the reciprocating slider 14 slides back and forth, the reciprocating slider 14 will also cause the fourth magnet 21 to drive the third magnet 20 to slide back and forth, and the third magnet 20 will drive the transverse tube 18 to slide back and forth, and the transverse tube 18 will drive the nozzles 19 on both sides to slide back and forth. At this time, flushing liquid is transported in the transverse tube 18, so the nozzle 19 can transport the sewage generated by backwashing to the wastewater pipe 4 in time, significantly improving the efficiency of sewage discharge from the pool body 1 and reducing secondary pollution to the filter material 3.

[0059] Embodiment five:

[0060] Reference Figure 4 , Figure 5 as well as Figure 8 , which is basically the same as Example 4, and further, a specific implementation plan for improving the backwashing effect of the filter material 3 is specifically added.

[0061] A sleeve 31 is fixedly connected to the upper end of the hollow plate 2, and a column 30 is longitudinally slidably installed in the sleeve 31. A lifting part is provided in the water outlet trough 11 for the column 30 to move up and down in the sleeve 31. The lifting part includes an active magnet 34 fixedly connected to the water outlet trough 11, and a driven magnet 33 that repels the active magnet 34 is fixedly installed at the lower end of the column 30. A second spring 32 is installed between the column 30 and the bottom of the sleeve 31.

[0062] Specifically, when the strip plate 10 moves to the lower end of the isolation groove, and the active magnet 34 in the strip plate 10 just moves to the bottom of the driven magnet 33, the driven magnet 33 will slide upward under the repulsive force of the two, thereby driving the column 30 to slide upward. When the active magnet 34 and the driven magnet 33 are offset from each other, the second spring 32 will drive the column 30 to move downward and reset, so that the column 30 moving up and down will loosen the filter material 3, so that it can obtain a better backwashing effect.

[0063] A backwashing process for a deep bed filter, the operating steps are as follows:

[0064] Step 1: Open the first valve 6 on the waste water pipe 4;

[0065] Step 2: transporting backwash water to the water inlet pipe 9;

[0066] Step 3: Make the strip plate 10 slide back and forth at the bottom of the pool body 1;

[0067] Step 4: During the movement of the strip plate 10, the baffles 27 in the plurality of narrow grooves 25 are lifted up in turn;

[0068] Step 5: Discharge the backwash wastewater from the tank body 1 through the wastewater pipe 4 .

[0069] When the overflow and backwashing system of the deep bed filter is in use, the ends of the overflow pipe 5 and the wastewater pipe 4 are extended to the secondary sedimentation tank. Therefore, when the liquid level in the tank body 1 is high, the excess sewage can enter the sedimentation tank to prevent the overflow of scattered water in the factory area. When the filter material 3 in the tank body 1 is backwashed, the first valve 6 on the wastewater pipe 4 is opened, so that the sewage generated by the backwashing can also be directly discharged into the secondary sedimentation tank. Therefore, there is no need to use a lifting pump to lift the sewage for a second time, thereby reducing resource consumption.

[0070] When the filter material 3 needs to be backwashed, the backwash water is transported to the water inlet pipe 9. After being transported by the hose 12, the backwash water will be transported from the water outlet 11 on the strip plate 10 to the bottom of the hollow plate 2 and the filter material 3, thereby achieving the effect of backwashing. Since the backwash water is restricted by the water outlet 11, the pressure of the backwash water will be concentrated in the water outlet 11, thereby improving the efficiency and effect of backwashing. During this period, the driving motor 15 will drive the reciprocating screw 13 to rotate, and the reciprocating screw 13 will drive the reciprocating slider 14 to rotate. The reciprocating slider 14 will drive the second magnet 17 to slide synchronously through the first magnet 16, and the second magnet 17 will drive the strip plate 10 to slide back and forth at the bottom of the pool body 1, and the water outlet 11 will perform a comprehensive backwashing operation on the filter material 3.

[0071] Due to the setting of the isolation plate 23, the filter material 3 will be equally divided into the isolation groove formed by multiple isolation plates 23. When the two sides of the strip plate 10 are aligned with the two isolation plates 23 respectively, or when the strip plate 10 is aligned with the lower port of the isolation groove, the backwash water discharged from the outlet trough 11 will concentrate on flushing the filter material 3 in the isolation groove, thereby making the flushing water pressure more concentrated and the backwashing effect better.

[0072] When there is a large amount of sewage to be filtered in the pool body 1, the flow pressure of the sewage will push the baffle 27 downward. At this time, the first spring 28 will be compressed, and the sewage will enter the wide groove 24 through the narrow groove 25, and then enter the filter material 3 for filtration. When the filter material 3 in the pool body 1 is backflushed, the water flow will flow upward, and the flowing water pressure will push the baffle 27 upward. The backwashed sewage will first enter the wide groove 24, and then pass through the narrow groove 25 and flow to the upper end surface of the top plate 22. Due to the setting of the isolation plate 23, the concentrated water flow will cause one or two baffles 27 in adjacent positions to be lifted upward, while the other baffles 27 are basically not affected by the water pressure and will not be lifted upward. Therefore, the sewage generated by the backwashing will flow along the upper end surface of the top plate 22 to the wastewater pipe 4, and the sewage will not secondary pollute other unflushed filter materials 3, further improving the backwashing effect.

[0073] When the strip plate 10 moves to the lower end of the isolation groove, and the active magnet 34 in the strip plate 10 just moves to the bottom of the driven magnet 33, the driven magnet 33 will slide upward under the repulsive force of the two, thereby driving the column 30 to slide upward. When the active magnet 34 and the driven magnet 33 are offset from each other, the second spring 32 will drive the column 30 to move downward and reset, so that the column 30 moving up and down will loosen the filter material 3, so that it can achieve a better backwashing effect.

[0074] When the reciprocating slider 14 slides back and forth, the reciprocating slider 14 will also cause the fourth magnet 21 to drive the third magnet 20 to slide back and forth, and the third magnet 20 will drive the transverse tube 18 to slide back and forth, and the transverse tube 18 will drive the nozzles 19 on both sides to slide back and forth. At this time, flushing liquid is transported in the transverse tube 18, so the nozzle 19 can transport the sewage generated by backwashing to the wastewater pipe 4 in time, which significantly improves the efficiency of sewage discharge from the pool body 1 and reduces the secondary pollution to the filter material 3.

[0075] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A deep bed filter overflow and backwash system, comprising a tank body (1), the bottom of the tank body (1) is fixedly connected to a suspended hollow plate (2), the upper end of the hollow plate (2) is paved with filter material (3), characterized in that: Also includes: A waste water pipe (4) is fixedly connected to the outer wall of the tank body (1). The wastewater pipe (4) is flush with the upper end surface of the filter material (3); an overflow pipe (5) is fixedly connected to the upper end of the pool body (1); and a first valve (6) is installed on both the wastewater pipe (4) and the overflow pipe (5); The strip plate (10) is installed on the inner bottom of the tank body (1) in a lateral sliding manner. The upper end of the strip plate (10) is provided with a strip water outlet groove (11), the outer wall of the pool body (1) is fixedly connected with a water inlet pipe (9), the output end of the water inlet pipe (9) is fixedly connected with a hose (12) extending into the water outlet groove (11), and the outer wall of the pool body (1) is provided with a driving part for driving the strip plate (10) to move back and forth.

2. A deep bed filter overflow and backwash system according to claim 1, characterized in that: The driving part comprises a reciprocating screw (13) rotatably connected to the outer wall of the pool body (1); the outer wall of the reciprocating screw (13) is provided with a reciprocating slider (14) slidably connected to the outer wall of the pool body (1); the reciprocating slider (14) is connected to the strip plate (10) via a magnetic attraction part; and a driving motor (15) for driving the reciprocating screw (13) to rotate is fixedly mounted on the pool body (1).

3. A deep bed filter overflow and backwash system according to claim 2, characterized in that: The magnetic attraction portion comprises a first magnet (16) fixedly connected to the reciprocating slider (14), and a second magnet (17) attracted to the first magnet (16) is fixedly mounted on the strip plate (10).

4. A deep bed filter overflow and backwash system according to claim 2, characterized in that: The hollow plate (2) is fixedly connected to a plurality of isolating plates (23) arranged at equal intervals, and the upper end of the hollow plate (2) forms a plurality of isolating grooves under the action of the isolating plates (23), the filter material (3) is filled in the plurality of isolating grooves, and the width of the strip plate (10) is greater than or equal to the width of the isolating grooves.

5. A deep bed filter overflow and backwash system according to claim 2, characterized in that: The reciprocating slider (14) is fixedly connected to a mounting frame (36), and a sewage pipe (35) located at an upper port of the pool body (1) is fixedly mounted on the mounting frame (36).

6. A deep bed filter overflow and backwash system according to claim 4, characterized in that: A top plate (22) located on top of the isolation plate (23) is fixedly connected to the pool body (1), a plurality of wide grooves (24) corresponding to the isolation grooves are provided at the bottom of the top plate (22), and a narrow groove (25) communicating with the wide grooves (24) is provided at the upper end of the isolation plate (23). A baffle (27) flush with the upper end surface of the top plate (22) is provided in the narrow groove (25); a cross frame (26) is fixedly connected in the wide groove (24); a support (29) is longitudinally slidably connected to the cross frame (26); the baffle (27) is fixedly connected to the support (29); and a first spring (28) is installed between the baffle (27) and the cross frame (26).

7. A deep bed filter overflow and backwash system according to claim 6, characterized in that: A transverse tube (18) is provided on the top of the top plate (22) and is slidably connected to the inner wall of the pool body (1). Nozzles (19) are fixedly installed on both sides of the transverse tube (18). The spraying direction of the nozzle (19) is parallel to the upper end surface of the top plate (22). Wastewater pipes (4) are provided on both sides of the pool body (1). A third magnet (20) is fixedly connected to the transverse tube (18). A fourth magnet (21) attracted to the third magnet (20) is fixedly connected to the reciprocating slider (14).

8. A deep bed filter overflow and backwash system according to claim 2, characterized in that: The upper end of the hollow plate (2) is fixedly connected with a sleeve (31), a column (30) is longitudinally slidably installed in the sleeve (31), and a lifting part for the column (30) to move up and down in the sleeve (31) is provided in the water outlet trough (11).

9. A deep bed filter overflow and backwash system according to claim 8, characterized in that: The lifting part comprises an active magnet (34) fixedly connected in the water outlet trough (11), a driven magnet (33) which repels the active magnet (34) is fixedly mounted at the lower end of the column (30), and a second spring (32) is mounted between the column (30) and the bottom of the sleeve (31).

10. A backwashing process for a deep bed filter, comprising an overflow and backwashing system for a deep bed filter according to any one of claims 1 to 9, characterized in that: The steps are as follows: Step 1: Open the first valve (6) on the waste water pipe (4); Step 2: transporting backwash water to the water inlet pipe (9); Step 3: making the strip plate (10) slide back and forth at the bottom of the pool body (1); Step 4: During the movement of the strip plate (10), the baffles (27) in the plurality of narrow grooves (25) are lifted up in turn; Step 5: The backwashed wastewater is discharged from the tank body (1) through the wastewater pipe (4).

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