Filter

Abstract

The present invention relates to the technical field of sewage treatment, and provides a filter, which comprises: a tank body, a first filter plate and a second filter plate are arranged in the tank body, and the first filter plate and the second filter plate are vertically arranged at an interval so as to divide the space in the tank body into a water distribution region, a filler region between the first filter plate and the second filter plate, and a water collection region, which are sequentially arranged from bottom to top; the filler area is suitable for providing a filling space for the fiber filter material; a water inlet and a water outlet are formed in the tank body, the water inlet is connected with the water distribution area, and the water outlet is connected with the water collection area. Through the arrangement, in the filtering process, the fiber filter material with small specific gravity floats on the upper layer of the filler area under the action of buoyancy to automatically form a filter layer, and the filter layer works in a compacted state under the action of water flow, so that the filtering precision is ensured; in addition, the part with large specific gravity of the asymmetric filter material is arranged at the lower part, and the part with small specific gravity is arranged at the upper part, so that a density crossed and continuous gradient density filter layer structure is formed, the deep filtering principle is met, and the filtering effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a filter. Background Art

[0002] The turbid circulating water system in the metallurgical, petroleum, chemical and other industries is characterized by high suspended solids levels, oil, iron oxide and other impurities. The water production indicators of turbid circulating water treatment structures such as advection tanks, chemical deoiling precipitators, rare earth magnetic disk units, and pressure-bearing integrated water cannot meet the water quality requirements of the production line. Production accidents such as nozzle blockage often occur. It is necessary to further reduce the turbidity and oil content of the turbid circulating water. In terms of technology, it is necessary to build a first-level filtration equipment before the cooling water in the tower.

[0003] The filter material of traditional early filtering equipment is quartz sand sand filter or multi-media filter, that is, adding a fruit shell activated carbon filter layer on the quartz sand filter layer to achieve better oil removal. However, due to the low filtration speed, insufficient impact resistance and incomplete backwashing of the above filters, fiber filter materials are gradually used in the later period, such as fiber bundles, fiber ball filter materials, etc.

[0004] However, in actual applications, it is found that for fiber filter media with low specific gravity, a certain pressure difference between the inlet and outlet water needs to be maintained, that is, the amount of water treated must be large enough to form a filter layer, and the density distribution of asymmetric fiber filter media is not reasonable, which affects the filtration accuracy. Sometimes the fiber filter media is fixedly loaded, such as fiber bundle filter elements and fiber ball integral filter bins, but this design brings about the problem of insufficient backwash space and poor backwash effect. Summary of the invention

[0005] The present invention provides a filter for solving the problems of poor filtering accuracy and backwashing effect of filters in the prior art, and has the advantages of high filtering accuracy and good backwashing effect.

[0006] The present invention provides a filter, comprising: A tank body, wherein a first filter plate and a second filter plate are arranged in the tank body, and the first filter plate and the second filter plate are arranged in an upper and lower interval to divide the space in the tank body into a water distribution area, a filling area between the first filter plate and the second filter plate, and a water collection area arranged in sequence from bottom to top; the filling area is suitable for providing a filling space for the fiber filter material; The tank body is provided with a water inlet and a water outlet, the water inlet is connected to the water distribution area, and the water outlet is connected to the water collection area.

[0007] According to a filter provided by the present invention, the filter also includes a backwashing system for cleaning the fiber filter material; The first filter plate and the second filter plate can be moved closer to or farther from each other to adjust the space size of the filling area.

[0008] According to a filter provided by the present invention, the second filter plate is located above the first filter plate and is fixedly connected to the tank body; the first filter plate can move closer to or away from the second filter plate.

[0009] A filter provided according to the present invention further comprises a driving member for driving the first filter plate to move; The driving member is fixedly connected to the second filter plate, and the driving end is fixedly connected to the first filter plate.

[0010] According to a filter provided by the present invention, the backwash system comprises: The air washing module is provided with a plurality of air outlets, wherein the air outlets are located in the filling area, and the plurality of air outlets are arranged circumferentially around the filling area, and the air outlets are arranged at an angle to the axial direction and the radial direction of the tank body.

[0011] According to a filter provided by the present invention, the backwash system also includes a backwash module, and the backwash module includes a backwash water inlet pipe and a backwash drain pipe; the backwash water inlet pipe is connected to the water outlet through a backwash water inlet valve, and the backwash drain pipe is connected to the water inlet through a backwash drain valve.

[0012] According to a filter provided by the present invention, the backwash system also includes a forward wash module, which includes a forward wash water inlet pipe and a forward wash drain pipe; the forward wash water inlet pipe is connected to the water inlet through an inlet valve, and the forward wash drain pipe is connected to the water outlet through a forward wash drain valve.

[0013] According to a filter provided by the present invention, a safety valve interface is provided on the top of the tank body; the backwash system also includes a safety valve connected to the safety valve interface and an exhaust valve connected in parallel with the safety valve.

[0014] According to a filter provided by the present invention, the second filter plate is fully covered with water filter caps; The second filter plate includes a central area and a peripheral area located outside the central area, and the water flow rate of the water filter cap in the central area is smaller than the water flow rate of the water filter cap in the peripheral area.

[0015] According to a filter provided by the present invention, a sealing ring is fixedly connected to the outer periphery of the first filter plate, and the sealing ring is elastically pressed against the inner wall of the tank body; And / or, a plurality of limiting sliding blocks are protruding from the edge of the first filter plate, and the plurality of limiting sliding blocks are evenly arranged around the geometric center of the first filter plate and are suitable for abutting against the inner wall of the tank body.

[0016] According to a filter provided by the present invention, the driving member comprises a cylinder; A cylinder mounting seat is fixedly arranged on the second filter plate, a cylinder body of the cylinder is fixedly connected to the cylinder mounting seat, and a piston rod of the cylinder is connected to the first filter plate.

[0017] According to a filter provided by the present invention, the air washing module comprises: An air compressor main pipe is arranged around the outer circumference of the tank body; A plurality of nozzles are circumferentially arranged around the filling area, the inlet end of the nozzle is connected to the compressed air main pipe, and the outlet end extends into the tank body to form the air outlet.

[0018] According to a filter provided by the present invention, the nozzle comprises a Rafale nozzle.

[0019] According to a filter provided by the present invention, the water distribution area is provided with a water distributor, and the water distributor comprises: A mother pipe is arranged along the radial direction of the tank body, one end of the mother pipe is open and the other end is closed, and the open end of the mother pipe extends out of the tank body to form the water inlet; A plurality of branch pipes have one end connected to the main pipe and the other end closed and extending radially along the tank body. The plurality of branch pipes cover the bottom area of ​​the filling area and are provided with water distribution holes.

[0020] According to a filter provided by the present invention, the water distribution holes face the bottom of the tank body.

[0021] According to a filter provided by the present invention, the bottom of the first filter plate is fully covered with first reinforcing ribs, and the first reinforcing ribs are cross-arranged along the radial direction of the first filter plate.

[0022] According to a filter provided by the present invention, the upper surface of the second filter plate is fully covered with second reinforcing ribs, and the second reinforcing ribs are cross-arranged along the radial direction of the second filter plate.

[0023] According to a filter provided by the present invention, a support column is fixedly connected to the intersection position of the second reinforcement ribs, and the other end of the support column relative to the second filter plate is connected to the top of the tank body.

[0024] According to a filter provided by the present invention, a manhole is provided on the top of the tank body, and a manhole cover is sealedly connected to the manhole.

[0025] The filter provided by the present invention fills the fiber filter material in the filling area between the first filter plate and the second filter plate during filtration. During filtration, the pressurized sewage enters the water distribution area from the water inlet, and enters the filling area from the water distribution area for filtration, and finally enters the water collection area and is discharged from the water outlet. During the filtration process, the water gradually fills the entire tank body, and the fiber filter material with a small specific gravity floats on the upper layer of the filling area under the action of buoyancy, thereby automatically forming a filter layer without using a pressure difference. Once filtering is performed, the filter layer will work in a compacted state under the action of water flow, thereby ensuring the filtration accuracy. Moreover, due to the asymmetric characteristics of a single fiber filter material, a single filter material will present a part with a larger specific gravity at the bottom and a part with a smaller specific gravity at the top, thus forming a filter layer structure with sparse and dense cross-over and continuous gradient density, which complies with the deep filtration principle, has a large sewage interception depth, a high sewage interception capacity, impurities do not accumulate on the surface, and a high filtration flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic structural diagram of a filter provided by an embodiment of the present invention in a filtering state.

[0028] Figure 2 It is a schematic structural diagram of a filter provided by an embodiment of the present invention in a backwashing state.

[0029] Figure 3 It is a schematic diagram of the structure of the backwash system provided in an embodiment of the present invention.

[0030] Figure 4 It is a structural schematic diagram of the air washing module provided in an embodiment of the present invention.

[0031] Figure 5 It is a schematic structural diagram of the cooperation between the nozzle and the tank body provided by an embodiment of the present invention.

[0032] Figure 6 It is a schematic diagram of the structure of the driving member provided by an embodiment of the present invention, the first filter plate and the second filter plate.

[0033] Figure 7 It is a front view of the first filter plate provided in an embodiment of the present invention.

[0034] Figure 8 4 is a top view of the first filter plate provided in an embodiment of the present invention.

[0035] Fig. 9It is a schematic structural diagram of the cooperation between the sealing ring and the first filter plate provided in an embodiment of the present invention.

[0036] Fig.10 is a top view of the second filter plate provided in an embodiment of the present invention.

[0037] Fig.11 It is a schematic structural diagram of the cooperation between the support column and the second reinforcing rib provided in an embodiment of the present invention.

[0038] Fig.12 It is a schematic structural diagram of the cooperation between the support column, the second reinforcing rib and the tank body provided in an embodiment of the present invention.

[0039] Fig.13 It is a schematic structural diagram of the cooperation between the water filter cap and the second filter plate provided in an embodiment of the present invention.

[0040] Fig.14 It is one of the structural schematic diagrams of the water distributor in the water distribution area provided in the embodiment of the present invention.

[0041] Fig.15 This is the second structural schematic diagram of the water distributor in the water distribution area provided in an embodiment of the present invention.

[0042] Reference numerals: 10. Tank body; 100. Water outlet; 101. Manhole; 102. Safety valve interface; 11. Water distribution area; 12. Filling area; 13. Water collection area; 14. Water production pipe; 15. Water production valve; 16. Water inlet pipe; 17. Water inlet valve; 18. Safety valve; 19. Exhaust valve; 20. First filter plate; 200. Connecting hole; 21. Sealing ring; 22. Connecting bolt; 23. Limiting slider; 24. First reinforcing rib; 30. Second filter plate; 300. Cylinder mounting seat; 31. Second reinforcing rib; 32. Support column; 33. Water filter cap ; 40. Backwash system; 41. Backwash module; 410. Backwash water inlet pipe; 411. Backwash drain pipe; 412. Backwash water inlet valve; 413. Backwash drain valve; 42. Forward wash module; 421. Forward wash drain pipe; 422. Forward wash drain valve; 43. Alkaline washing module; 430. Alkaline washing pipeline; 431. Alkaline washing valve; 44. Air washing module; 440. Air compressed air main pipe; 441. Nozzle; 442. Air backwash valve; 50. Drive unit; 60. Water distributor; 600. Main pipe; 601. Branch pipe; 602. Water distribution hole. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In order to better understand the filter provided by the present invention, its application background is first introduced. The turbid circulating water in the metallurgical, petroleum, chemical and other industries has the characteristics of high suspended matter level, oil, iron oxide and other impurities. After being treated by the water treatment structure, it still cannot meet the water quality requirements of the production line and needs to be further filtered before the cooling water is put into the tower. The filter material selected by the traditional early filtering equipment is a sand filter or a multi-media filter made of quartz sand. However, due to the limitation of filtering speed, impact resistance and backwashing effect, fiber filter materials such as fiber bundles and fiber ball filter materials are gradually selected in the later stage.

[0045] However, it is found in actual applications that traditional filtering equipment all adopts a treatment process of top-filling water and bottom-draining water. The quartz sand filter with a high specific gravity can automatically form a grading layer according to the principle of grading, which is not a big problem. However, the fiber filter material with a low specific gravity needs to be maintained on the basis of a certain pressure difference between the inlet and outlet water, that is, the treated water volume must be large enough to form a filter layer, and the density distribution of the fiber filter material is not reasonable, which affects the filtration accuracy. Sometimes the fiber filter material is fixedly loaded, such as fiber bundle filter elements and fiber ball integral filter bins. However, this design brings about the problem of insufficient backwash space and poor backwash effect.

[0046] Based on the above problems and findings, the present invention provides a filter having the advantages of high filtering accuracy and good backwashing effect.

[0047] Combine the following Figure 1-Figure 15 The filter of the present invention is described.

[0048] Reference Figure 1 and Figure 2 A filter comprises a tank body 10, in which a first filter plate 20 and a second filter plate 30 are arranged, wherein the first filter plate 20 and the second filter plate 30 are arranged at intervals up and down to divide the space in the tank body 10 into a water distribution area 11, a filling area 12 between the first filter plate 20 and the second filter plate 30, and a water collection area 13 arranged in sequence from bottom to top; the filling area 12 is suitable for providing a filling space for a fiber filter material; a water inlet and a water outlet 100 are provided on the tank body 10, the water inlet is connected to the water distribution area 11, and the water outlet 100 is connected to the water collection area 13.

[0049] In actual work, the fiber filter material is filled in the filling area 12 between the first filter plate 20 and the second filter plate 30. During filtration, the pressurized sewage enters the water distribution area 11 from the water inlet, and enters the filling area 12 from the water distribution area 11 for filtration, and finally enters the water collection area 13 and is discharged from the water outlet 100. During the filtration process, the water gradually fills the entire tank body 10, and the fiber filter material with a small specific gravity floats on the upper layer of the filling area 12 under the action of buoyancy, thereby automatically forming a filter layer without using a pressure difference. Once filtering is performed, the filter layer will work in a compacted state under the action of water flow, thereby ensuring the filtration accuracy. Due to the asymmetric characteristics of a single fiber filter material, a single filter material will present a part with a larger specific gravity at the bottom and a part with a smaller specific gravity at the top, thus forming a filter layer structure with a sparse and cross-density and continuous gradient density, which conforms to the principle of deep filtration, has a large sewage interception depth, a high sewage interception capacity, impurities do not accumulate on the surface, and a high filtration flow rate.

[0050] In some optional embodiments, parameters such as shape, material and size specifications of the tank body 10 can be flexibly designed according to actual needs, such as sewage treatment volume, water pressure strength, etc., as long as it meets the required treatment capacity and pressure bearing capacity.

[0051] In addition, the fiber filter material in the embodiment of the present invention adopts asymmetric fiber filter material, such as universal comet fiber filter material, and some special uses (for example: filter material with denitrification function, suitable for high turbidity water, oily wastewater, etc.) filter material can be customized according to process requirements, and will not be listed one by one in the embodiment of the present invention. The size specifications and packing density of the fiber filter material can be selected and designed according to the actual required effluent water quality, and are not specifically limited in the embodiment of the present invention.

[0052] In one embodiment of the present invention, taking a vertical columnar tank body 10 as an example, the up and down direction is the axial direction of the tank body 10, and the first filter plate 20 and the second filter plate 30 are arranged at intervals along the axial direction of the tank body 10, thereby dividing the space inside the tank body 10 into a water distribution area 11, a filling area 12 and a water collection area 13 arranged in sequence along the axial direction.

[0053] Specifically, the water distribution area 11 is formed in the area of ​​the lower head of the tank body 10, the water inlet is arranged on the lower head of the tank body 10, the water collection area 13 is formed in the upper head area of ​​the tank body 10, and the water outlet 100 is arranged on the upper head of the tank body 10. A manhole 101 is also arranged on the upper head of the tank body 10, and the manhole 101 is sealed with a manhole cover through a flange, so that the staff can easily inspect and repair various components in the tank body 10 through the manhole 101.

[0054] In one embodiment of the present invention, referring to Figures 3 to 5 The filter also includes a backwashing system 40. After the filter has been used for a period of time, the backwashing system 40 can be used to backwash the fiber filler in the filler area 12 to ensure the filtering efficiency.

[0055] The backwash system 40 may include a backwash module 41 for backwashing the fiber filler with water, and may also include an air wash module 44 for stirring the fiber filler in the filler area 12 with wind, so that impurities fall off the fiber filler under the drag of centrifugal force, and may also include both the backwash module 41 and the air wash module 44, and improve the backwash effect by combining wind and water backwashing. In the embodiment of the present invention, in order to improve the backwash effect, the backwash system 40 includes both the backwash module 41 and the air wash module 44.

[0056] The backwash module 41 is adapted to supply backwash water from above the packing area 12. Backwashing by water inlet from above is beneficial to washing away dirt, and after washing away dirt, the sewage with dirt can be discharged naturally under the action of gravity, which is beneficial to improving the backwash effect.

[0057] Specifically, the backwash module 41 includes a backwash water inlet pipe 410 and a backwash drain pipe 411; wherein the backwash water inlet pipe 410 is connected to the water outlet 100 through a backwash water inlet valve 412, and the backwash drain pipe is connected to the water inlet through a backwash drain valve 413. When backwashing is performed, the backwash drain valve 413 is opened, and the backwash module 41 supplies backwash water to the filling area 12 through the water outlet 100, and the sewage after backwashing can be discharged from the water inlet through the backwash drain pipe 411.

[0058] For the convenience of control, the water outlet 100 of the tank body 10 is connected to the water production pipe 14 through the water production valve 15, and the water inlet of the tank body 10 is connected to the water inlet pipe 16 through the water inlet valve 17; in the filtration stage, the water inlet valve 17 and the water production valve 15 are opened, the backwash water inlet valve 412 and the backwash drain valve 413 are closed, and the sewage enters from the water inlet and is discharged from the water outlet 100 after filtration; in the backwash stage, the water inlet valve 17 and the water production valve 15 are closed, the backwash water inlet valve 412 and the backwash drain valve 413 are opened, the backwash water enters the tank body 10 through the water outlet 100 to backwash the fiber filler, and the backwash water is discharged through the backwash drain pipe 411 through the water inlet.

[0059] In order to further improve the backwashing effect, in one embodiment of the present invention, the backwashing system 40 further includes a forward washing module 42, which is adapted to supply washing water from below the packing area 12. After the backwashing, the forward washing module 42 performs forward washing, which can further improve the washing effect of the dirt.

[0060] Specifically, the forward wash module 42 includes a forward wash water inlet pipe and a forward wash drain pipe 421; wherein the forward wash water inlet pipe is connected to the water inlet through the forward wash water inlet valve, and the forward wash drain pipe 421 is connected to the water outlet 100 through the forward wash drain valve 422. After the backwash is finished, the backwash water inlet valve 412 and the backwash drain valve 413 are closed, and the forward wash water inlet valve and the forward wash drain valve 422 are opened, and the forward wash water enters through the water inlet to clean the fiber filler in the filler area 12, and the cleaned water is discharged through the water outlet 100 through the forward wash drain pipe 421.

[0061] Specifically, during the forward wash, the forward wash water can be provided by the water inlet pipe 16 , that is, the water inlet pipe 16 and the forward wash water inlet pipe use the same pipe and are controlled on and off by the water inlet valve 17 .

[0062] In one embodiment of the present invention, the backwash system 40 also includes an alkali washing module 43; the alkali washing module 43 includes an alkali washing pipe 430, which is connected to the water inlet through an alkali washing valve 431. After the filter has been running for a period of time, alkali liquid is provided through the alkali washing pipe 430 to perform alkali washing on the tank body 10 and various components in the tank body 10 to ensure the filtration efficiency.

[0063] In one embodiment of the present invention, the air washing module 44 is provided with a plurality of air outlets, which are located in the packing area 12, and the plurality of air outlets are arranged circumferentially around the packing area 12, and the air outlets are arranged at an angle to the axial direction and the radial direction of the tank body 10. With such arrangement, during the air washing stage, the air washing module 44 passes air into the packing area 12 through the air outlets, and the water in the packing area 12 is stirred by the wind pressure to scrub the fiber filter material in a circular motion, and at the same time, a huge centrifugal force is formed, and the impurities on the fiber filter material fall off under the drag of the centrifugal force, which greatly improves the backwashing effect.

[0064] Specifically, the air washing module 44 includes a compressed air main pipe 440 and a nozzle 441; wherein the compressed air main pipe 440 is arranged around the outer periphery of the tank body 10 for supplying compressed air; there are multiple nozzles 441, which are arranged circumferentially around the filling area 12, and the inlet end of the nozzle 441 is connected to the compressed air main pipe 440, and the outlet end extends into the tank body 10 to form the above-mentioned air outlet. In the air washing stage, the compressed air is transported to the multiple nozzles 441 through the compressed air main pipe 440 and sprayed into the filling area 12 by the nozzles 441. The water in the filling area 12 rotates in a circle under the action of the wind pressure to scrub the fiber filter material and promote the shedding of impurities.

[0065] The specific type, arrangement number and arrangement angle of the nozzles 441 can be selected according to actual needs to achieve the desired stirring effect.

[0066] As a specific embodiment of the present invention, the nozzle 441 is a Rafale nozzle, and the nozzle 441 is installed at an angle of 45 degrees in the radial direction and the axial direction of the tank body 10 to achieve the best stirring effect.

[0067] Specifically, the air wash module 44 can be controlled by an air backwash valve 442 .

[0068] To ensure safety, in one embodiment of the present invention, a safety valve interface 102 is provided on the top of the tank body 10, and a safety valve 18 is connected to the safety valve interface 102. When overpressure occurs during the operation of the filter, the safety valve 18 can open to release the pressure, thereby ensuring the safety of the equipment operation.

[0069] In one embodiment of the present invention, the filter also includes an exhaust valve 19, which is connected in parallel with the safety valve 18. During the backwash stage, the exhaust valve 19 is always in an open state, and the tank body 10 can be depressurized through the exhaust valve 19, thereby avoiding overpressure during operation of the tank body 10 and further ensuring safety.

[0070] In order to increase the backwash space and improve the backwash effect during the backwash stage, refer to Figure 1 and Figure 2 In one embodiment of the present invention, the first filter plate 20 and the second filter plate 30 can be moved closer to or farther from each other to adjust the space size of the packing area 12. In this way, during the backwashing stage, by moving the first filter plate 20 and the second filter plate 30 away from each other, the space of the packing area 12 can be increased, the packing density of the packing can be reduced, and the fiber packing can be fully scrubbed under the wind and water combined backwashing, and the backwashing effect is better. After the backwashing is completed, the first filter plate 20 and the second filter plate 30 are moved closer to each other, so that the fiber packing meets the required packing density, thereby ensuring the filtering effect.

[0071] Specifically, the second filter plate 30 is located above the first filter plate 20 and is fixedly connected to the tank body 10 , and the first filter plate 20 can move closer to or away from the second filter plate 30 .

[0072] In order to more conveniently adjust the space of the packing area, the filter further includes a driving member 50 for driving the first filter plate 20 to move closer to or away from the second filter plate 30; the driving member 50 is fixedly connected to the second filter plate 30 and the driving end is fixedly connected to the first filter plate 20. During the backwashing stage, the driving member 50 drives the first filter plate 20 to move away from the second filter plate 30 to increase the space of the packing area 12. After the backwashing is completed, the driving member 50 drives the first filter plate 20 to move closer to the second filter plate 30 to reduce the space of the packing area 12 to ensure the packing density of the fiber filler.

[0073] According to different actual needs, the driving member 50 can be selected to have different structures or forms, for example, a cylinder, an electric push rod, a motor-driven screw and a screw nut and other linear driving elements can be used, and the specific one can be selected according to actual needs.

[0074] As a specific embodiment of the present invention, the driving member 50 is a cylinder, and an air pressure pipe penetrating the tank wall of the tank body 10 is used to provide air pressure for the cylinder.

[0075] More specifically, refer to Figure 6 A cylinder mounting seat 300 is fixedly provided at the center position of the second filter plate 30, and the bottom end of the cylinder body is fixedly connected to the cylinder mounting seat 300 by bolts. A connecting hole 200 is provided at the center position of the first filter plate 20, and the end of the cylinder piston rod is a rigid universal joint and connected to the connecting hole 200.

[0076] It is understandable that the connection between the cylinder and the first filter plate 20 and the second filter plate 30 includes but is not limited to the connection methods listed above, and other connection methods can be used as long as they can achieve the connection between the cylinder and the first filter plate 20 and the second filter plate 30.

[0077] Specifically, the filter provided in the embodiment of the present invention performs backwashing operation through the following steps: During the backwashing stage, first close the water inlet valve 17 and the water production valve 15, and the driving member 50 drives the first filter plate 20 to move away from the second filter plate 30 to increase the space of the packing area 12, then open the backwashing water inlet valve 412 and the backwashing drain valve 413, and then open the exhaust valve 19, open the air washing module 44, and perform a combined wind and water backwashing on the packing in the packing area 12. The combined wind and water backwashing time is generally 3-5 minutes, and then close the air washing module 44. After backwashing for 1 minute, turn off the backwashing water pump, then close the backwashing water inlet valve 412 and the backwashing drain valve 413, open the water inlet valve 17 and the forward wash drain valve 422 for 1 minute of forward wash, and then close the forward wash drain valve 422, open the water production valve 15, and the driving member 50 drives the first filter plate 20 to move close to the second filter plate 30 to reset, and close the exhaust valve 19, and then normal filtering operations can be performed.

[0078] The specific structures of the first filter plate 20 and the second filter plate 30 will be described below in conjunction with the accompanying drawings.

[0079] Reference Figures 7 to 9 The shape of the first filter plate 20 is compatible with the cross-sectional shape of the tank body 10, and its specific structure and material can be selected according to actual needs. For example, the first filter plate 20 can be made of a stainless steel wedge-shaped screen, or a stainless steel porous plate with a PP material screen in the middle. No specific limitation is made in the embodiments of the present invention.

[0080] Since the first filter plate 20 is a movable filter plate, a certain matching gap needs to be left between the outer periphery of the first filter plate 20 and the inner wall of the tank body 10. During the backwashing stage, under the action of water pressure and wind pressure, the fiber filter material may enter the water distribution area 11 through this gap, causing backwashing material leakage.

[0081] In order to solve the above problem, in one embodiment of the present invention, a sealing ring 21 is fixedly connected to the outer periphery of the first filter plate 20, and the sealing ring 21 is used to elastically press the inner wall of the tank body 10 to achieve sealing.

[0082] In one embodiment of the present invention, the sealing ring 21 can be fixed to the outer periphery of the first filter plate 20 by connecting bolts 22. The specific material of the sealing ring 21 can be selected according to actual needs. In this embodiment, the sealing ring 21 is made of cooked rubber material.

[0083] In order to ensure the stability of the sliding of the first filter plate 20 and prevent the filter plate from tilting when it is moving, in one embodiment of the present invention, a plurality of limiting sliders 23 are convexly provided at the edge of the first filter plate 20, and the plurality of limiting sliders 23 are evenly arranged around the geometric center of the first filter plate 20, and are suitable for abutting against the inner wall of the tank body 10. During the sliding process of the first filter plate 20, the limiting slider 23 can abut against the inner wall of the tank body 10 to limit and constrain the first filter plate 20, so that the first filter plate 20 can only slide along the axial direction of the tank body 10 without tilting, which is conducive to improving the smoothness and stability of the sliding of the first filter plate 20.

[0084] The specific number of the limit sliders 23 and the connection method with the first filter plate 20 can be selected according to actual needs. As a specific embodiment of the present invention, there are four limit sliders 23 evenly distributed around the geometric center of the first filter plate 20, and the limit sliders 23 are fixedly connected to the upper surface of the first filter plate 20 by welding.

[0085] In order to ensure the structural strength of the first filter plate 20 , in one embodiment of the present invention, the first filter plate 20 is fully welded with first reinforcing ribs 24 . Specifically, the first reinforcing ribs 24 are welded to the bottom surface of the first filter plate 20 and are arranged in a horizontal and vertical cross pattern along the radial direction of the first filter plate 20 .

[0086] Reference Figures 10 to 12 In one embodiment of the present invention, the shape of the second filter plate 30 is adapted to the cross-sectional shape of the tank body 10 and is fixedly connected to the tank body 10. The specific structure, material, and specific connection method of the second filter plate 30 with the tank body 10 can be selected according to actual needs. In this embodiment, in order to ensure the structural strength of the second filter plate 30, it is made of a Q235 steel plate with a thickness of 12 mm. The periphery of the second filter plate 30 is extended to the outside of the tank for welding, that is, the upper head and the lower straight section of the tank body 10 are welded to the second filter plate 30. In one embodiment of the present invention, the upper surface of the second filter plate 30 is fully covered with second reinforcing ribs 31 to further improve the structural strength of the second filter plate 30. Specifically, the second reinforcing ribs 31 are arranged horizontally and vertically along the radial direction of the second filter plate 30, and the intersections of the second reinforcing ribs 31 are fully welded.

[0087] In one embodiment of the present invention, a support column 32 is fixedly connected to the upper surface of the second filter plate 30 , one end of the support column 32 is fixedly connected to the second filter plate 30 , and the other end is fixedly connected to the upper head of the tank body 10 .

[0088] Specifically, the support column 32 is welded to the intersection of the second reinforcing ribs 31 , and the other end of the support column 32 relative to the second filter plate 30 is fixed to the upper head of the tank body 10 by welding.

[0089] The support column 32 can further improve the structural strength of the second filter plate 30, thereby ensuring that the second filter plate 30 does not deform under the filtering pressure difference.

[0090] In one embodiment of the present invention, referring to Fig.12 and Fig.13 The second filter plate 30 is covered with filter caps 33, which can ensure the uniformity of the flow velocity of the water flow section, thereby ensuring the uniform distribution of the fiber filter material.

[0091] Specifically, the first filter plate 20 includes a central area and a peripheral area outside the central area, and the water filter cap 33 has two specifications, and the water flow rate of the water filter cap 33 in the central area is less than the water flow rate of the water filter cap 33 in the peripheral area. Such an arrangement can provide compensation for the water flow rate of the edge area, thereby achieving more uniform water distribution and improving the uniformity of the fiber filter material distribution.

[0092] It is understandable that the specific areas of the central area and the edge area and the specific specifications and arrangement quantity of the water filter caps 33 and other parameters can be flexibly designed according to the actual water flow demand, and no specific restrictions are made in the embodiments of the present invention.

[0093] It should be pointed out that the specific type and structure of the water filter cap 33 can refer to the prior art and will not be described in detail in the embodiment of the present invention.

[0094] In order to ensure uniform water distribution during filtration, in one embodiment of the present invention, reference is made to Fig.14 and Fig.15, a water distributor 60 is provided in the water distribution area 11, and the water distributor 60 includes a main pipe 600 and a plurality of branch pipes 601; wherein, the main pipe 600 is arranged in the water distribution area 11 along the radial direction of the tank body 10, one end of the main pipe 600 is open and the other end is closed, and the open end of the main pipe 600 passes through the tank body 10 to form the above-mentioned water inlet; one end of the branch pipe 601 is connected to the main pipe 600, and the other end is closed and extends along the radial direction of the tank body 10, and the branch pipe 601 is arranged at an angle with the main pipe 600, and the plurality of branch pipes 601 cover the bottom area of ​​the filling area 12, and the branch pipe 601 is provided with a water distribution hole 602. During filtration, the sewage is distributed to the plurality of branch pipes 601 through the main pipe 600, and the plurality of branch pipes 601 covering the bottom of the filling area 12 can evenly distribute the sewage to the filling area 12, thereby ensuring the filtration efficiency.

[0095] Specifically, the water distribution hole 602 is arranged at the bottom of the branch pipe 601, that is, toward the bottom of the tank body 10. After the sewage flows out through the water distribution hole 602, it impacts the tank body 10, and flows upward after being refracted by the tank body 10, which is beneficial to further improve the uniformity of water distribution.

[0096] In order to ensure the stability of the water distributor 60 connected to the bottom of the tank body 10, the closed end of the main pipe 600 is welded and fixed to the tank body 10, and the tail end of the branch pipe 601 is also fixedly connected to the tank body 10 by welding.

[0097] It is to be understood that, without mutual contradiction, those skilled in the art may combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification.

[0098] By using the filter provided by the embodiment of the present invention, the fiber filter material is filled in the filling area 12 between the first filter plate 20 and the second filter plate 30 during filtration. During filtration, the pressurized sewage enters the water distribution area 11 from the water inlet, and enters the filling area 12 from the water distribution area 11 for filtration, and finally enters the water collection area 13 and is discharged from the water outlet 100. During the filtration process, the water gradually fills the entire tank body 10, and the fiber filter material with a small specific gravity floats on the upper layer of the filling area 12 under the action of buoyancy, thereby automatically forming a filter layer without using a pressure difference. Once filtering is performed, the filter layer will work in a compacted state under the action of water flow, thereby ensuring the filtration accuracy. Due to the asymmetric characteristics of a single fiber filter material, a single filter material will present a part with a larger specific gravity at the bottom and a part with a smaller specific gravity at the top, thus forming a filter layer structure with a sparse and dense cross and a continuous gradient density, which conforms to the principle of deep filtration, has a large sewage interception depth, a high sewage interception capacity, impurities are not accumulated on the surface, and the filtration flow rate is high.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A filter, characterized in that: include: A tank body (10), wherein a first filter plate (20) and a second filter plate (30) are arranged in the tank body (10), wherein the first filter plate (20) and the second filter plate (30) are arranged at intervals up and down, so as to divide the space in the tank body (10) into a water distribution area (11), a filling area (12) between the first filter plate (20) and the second filter plate (30), and a water collection area (13) which are arranged in sequence from bottom to top; the filling area (12) is suitable for providing a filling space for a fiber filter material; The tank body (10) is provided with a water inlet and a water outlet (100), the water inlet is connected to the water distribution area (11), and the water outlet (100) is connected to the water collection area (13).

2. The filter according to claim 1, characterized in that The filter also includes a backwash system (40) for cleaning the fiber filter material; The first filter plate (20) and the second filter plate (30) can be moved closer to or farther from each other, so as to adjust the spatial size of the filling area (12).

3. The filter according to claim 2, characterized in that The second filter plate (30) is located above the first filter plate (20) and is fixedly connected to the tank body (10); the first filter plate (20) can move closer to or away from the second filter plate (30).

4. The filter according to claim 3, characterized in that It also includes a driving member (50) for driving the first filter plate (20) to move; The driving member (50) is fixedly connected to the second filter plate (30) and the driving end is fixedly connected to the first filter plate (20).

5. The filter according to claim 2, characterized in that The backwash system (40) comprises: The air washing module (44) is provided with a plurality of air outlets, wherein the air outlets are located in the filling area (12), and the plurality of air outlets are arranged circumferentially around the filling area (12), and the air outlets are arranged at an angle to the axial direction and the radial direction of the tank body (10).

6. The filter according to claim 5, characterized in that The backwash system (40) further comprises a backwash module (41), wherein the backwash module (41) comprises a backwash water inlet pipe (410) and a backwash drain pipe (411); the backwash water inlet pipe (410) is connected to the water outlet (100) via a backwash water inlet valve (412), and the backwash drain pipe (411) is connected to the water inlet via a backwash drain valve (413).

7. The filter according to claim 6, characterized in that The backwash system (40) further comprises a forward wash module (42), wherein the forward wash module (42) comprises a forward wash water inlet pipe and a forward wash drain pipe (421); the forward wash water inlet pipe is connected to the water inlet via a forward wash water inlet valve, and the forward wash drain pipe (421) is connected to the water outlet (100) via a forward wash drain valve (422).

8. The filter according to claim 7, characterized in that A safety valve interface (102) is provided on the top of the tank body (10); the filter further comprises a safety valve (18) connected to the safety valve interface (102) and an exhaust valve (19) connected in parallel with the safety valve (18).

9. The filter according to any one of claims 1 to 8, characterized in that The second filter plate (30) is fully covered with water filter caps (33); The second filter plate (30) comprises a central area and a peripheral area located outside the central area, and the water flow rate of the water filter cap (33) in the central area is smaller than the water flow rate of the water filter cap (33) in the peripheral area.

10. The filter according to claim 2, characterized in that A sealing ring (21) is fixedly connected to the outer periphery of the first filter plate (20), and the sealing ring (21) is elastically pressed against the inner wall of the tank body (10); And / or, a plurality of limit sliders (23) are protruding from the edge of the first filter plate (20), and the plurality of limit sliders (23) are evenly arranged around the geometric center of the first filter plate (20) and are suitable for abutting against the inner wall of the tank body (10).

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