Radial filter

Abstract

The present invention provides a radial filter, comprising a filter cartridge, a water inlet pipe, a backwash drain pipe, a backwash water inlet pipe, a water outlet pipe, a backwash water distributor, a sewage pipe, filter material, a guide, a water distribution trough, a water collector, and a water collection merging trough; the water flow is guided into the depth of the filter material by the guide, forming radial filtration, while the water flow is guided into the filter material from top to bottom by the water distribution trough, forming vertical filtration, thereby effectively increasing the filtration area and improving the filtration effect and efficiency; the backwash flow of the backwash water is only a fraction of the filtration flow, and the filter material is flushed clean by the water inlet flow alone, and there is no need to set up a special backwash water tank, a backwash water pump, and a large-diameter pipeline valve. Since the height size of the radial flow filter is relatively unrestricted, a larger filtration area can be easily obtained by increasing the height, and the backwash flow does not need to be increased.

Description

Technical Field

[0001] The present invention relates to the field of filter equipment, in particular to a radial filter. Background Art

[0002] The most common principle of water purification filters is to install a filter layer (such as granular filter media like quartz sand) inside the filter. As filtered water flows down through the filter layer, impurities in the water are trapped on the filter media, resulting in clear water. After a period of use, the filter media accumulates more and more impurities, eventually clogging the filter layer and rendering it unusable. This requires backflushing, which allows water to flow up through the filter layer. The upward pressure of the water causes the filter layer to expand and loosen, allowing impurities trapped in the filter media to rise and escape from the filter layer. After backflushing, the filter layer regains its filtration capacity. Regular backflushing ensures long-term filter operation.

[0003] Therefore, the filtration capacity of existing filters is determined by the filter media's filtration area—the cross-sectional area of the filter media perpendicular to the direction of water flow. When handling large volumes of water, filters with a large filtration area are required, necessitating correspondingly larger filter sizes or the use of multiple filters. Because commonly used sand filter media has a higher specific gravity than water, typically 2.5 to 2.7, the backwash water flow from the bottom must be strong enough to expand and churn the naturally accumulated sand layer beneath the filter, allowing impurities to be flushed out.

[0004] However, the filters of the prior art have the following defects:

[0005] If a large amount of water is required, the size of the filter will be very large. Excessive size will bring difficulties in manufacturing and transportation. Moreover, the larger the size of the filter, the more difficult it is to achieve uniform backwash water flow over a large area. Uneven water flow cannot rinse the filter media cleanly, and may also disrupt the layered support structure of the filter media, causing filter damage or filter media loss. In order to achieve the necessary expansion effect of the filter media during backwashing, the backwash water flow rate is much larger than the operating flow rate, usually 5-6 times. Therefore, the backwash water source of the filter cannot use the raw water to be filtered, and a backwash water tank and backwash water pump must be set up separately to pump water from the backwash tank for backwashing. The power of the backwash pump is much greater than that of the raw water pump, and the diameter of the backwash water pipeline valve is also much larger than that of the water inlet pipeline. The backwash system is expensive, occupies a lot of space, and is difficult to control electrically. In many cases, the backwash pool cannot be set up due to lack of site conditions at the site of use, and the backwash pump cannot be matched without a high-power power supply. Backwashing consumes a large amount of backwash water, which contains a large amount of impurities. If there is no special water recovery facility, the backwash water is usually discharged directly, resulting in a large amount of water resource waste.

[0006] Therefore, it is necessary to provide a new radial filter to solve the above problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a radial filter with a large filtration area, low backwashing water consumption and good backwashing effect under the same volume specifications.

[0008] In order to solve the above technical problems, the present invention provides a radial filter, comprising:

[0009] The filter cartridge comprises a cylindrical body with a closed bottom end and an open top end, and a sealing head fixed to the open end of the cylindrical body;

[0010] A water inlet pipe is provided at one end of the cylinder close to the sealing head, and the water inlet pipe passes through the cylinder and is connected to the cylinder;

[0011] A backwash drain pipe is provided at one end of the cylinder body close to the sealing head, passes through the cylinder body and is connected to the cylinder body, and is horizontally spaced apart from the water inlet pipe;

[0012] a backwash water inlet pipe, the backwash water inlet pipe being arranged at the bottom end of the cylinder and passing through the cylinder;

[0013] a water outlet pipe, the water outlet pipe being arranged near the bottom end of the cylinder and passing through the cylinder;

[0014] A backwash water distributor, which is arranged at the bottom of the cylinder and is connected to the backwash water inlet pipe;

[0015] A sewage pipe is provided at the bottom of the cylinder and passes through the cylinder;

[0016] Filter material, the filter material is a granular filter material, the filter material is filled in the cylinder and the backwash water distributor is buried;

[0017] The deflector is a hollow cylindrical structure with one end open and the other end closed. The closed end of the deflector is inserted into the filter material along the axial direction of the cylinder. The deflector extends above the recoil water distributor and is spaced therefrom. The circumference of the deflector is provided with a plurality of deflector filter holes penetrating therethrough. The pore size of the deflector filter holes is smaller than the particle size of the filter material. The sewage pipe passes through the closed end of the deflector and is connected to the deflector.

[0018] A water distribution trough, the water distribution trough is annular and flush with the water inlet pipe, the water distribution trough is sleeved and fixed on the deflector and spaced from the filter material, the inner circumference of the water distribution trough is fitted and fixed to the deflector, the outer circumference of the water distribution trough is spaced from the cylinder to form a water flow gap, the bottom of the water distribution trough is provided with a plurality of bottom filter holes passing therethrough, and the outer circumference of the bottom of the water distribution trough extends to abut and be fixed to the cylinder;

[0019] A water collector, the water collector is annular and is coaxially arranged with the cylinder, the water collector is located between the inner side wall of the cylinder and the filter material and is fixed to the cylinder, the water collector has a clean water collection space extending along its axial direction, the top end of the clean water collection space is closed and the bottom end is open; the water collector is provided with a plurality of water collector filter holes running through it, the water collector filter holes are in the shape of long strips extending along the axial direction of the water collector and the width of the water collector filter holes is smaller than the particle size of the filter material; the water collector is buried in the filter material and the top end of the water collector is separated from the top surface of the filter material by a safe distance; and,

[0020] The water collecting and merging trough is annular and coaxially arranged with the cylinder. The water collecting and merging trough is located between the inner wall of the cylinder and the filter material and is fixed to the cylinder. The bottom of the water collecting and merging trough is farther away from the recoil water distributor than the bottom of the deflector. The top of the water collecting and merging trough is fixedly connected to the water collector and the two are interconnected. The outlet pipe passes through the water collecting and merging trough and is interconnected.

[0021] Preferably, the top of the water collecting and converging trough is provided with a plurality of through holes passing therethrough, the positions and sizes of the through holes correspond to the water collecting space, and the water collecting and converging trough is connected to the water collecting space through the through holes.

[0022] Preferably, the water collecting and converging trough is flush with the water outlet pipe, and the height of the water collecting and converging trough along the axial direction of the cylinder is greater than or equal to the diameter of the water outlet pipe.

[0023] Preferably, a plurality of water collecting and converging tank filter holes are provided on one side of the water collecting and converging tank close to the central axis of the cylinder.

[0024] Preferably, the water collector includes a plurality of long metal plates extending axially along the cylinder, the plurality of metal plates are distributed radially along the cylinder and intersect with each other to form an angle, the plurality of metal plates are sequentially connected end to end to form a ring-shaped wave structure plate, the trough position of the wave structure plate is fixed to the cylinder, and the crest position of the wave structure plate is toward the central axis of the cylinder; the water collector filter hole is opened on each of the metal plates, and the two metal plates at the same crest of the wave structure plate and the cylinder together form a clean water collection space.

[0025] Preferably, the water collector includes a plurality of long metal tubes extending axially along the cylinder, and the plurality of metal tubes are arranged at intervals and together form a ring structure. The water collector filter hole is opened in each of the metal tubes, and each of the metal tubes is fixed to the cylinder, and a clean water collection space is formed inside each of the metal tubes.

[0026] Preferably, the deflector is a cylindrical structure made of a metal plate mesh with a smooth surface; the water collector is made of a metal plate with a smooth surface.

[0027] Preferably, the diameter of the metal tube is less than or equal to 50 mm.

[0028] Preferably, the top surface of the water distribution and sump is lower than the top surface of the deflector.

[0029] Preferably, the filter material is quartz sand with a particle size of 0.6-1.2 mm, or anthracite with a particle size of 0.8-1.8 mm.

[0030] Compared with the prior art, the radial filter of the present invention, through the coordination of structures such as the guide and the water collector, transforms the filtration from a planar structure to a three-dimensional structure, and the water flow is changed from up and down flow to radial flow. The upper and lower water-facing surfaces of the radial filter and the outer periphery of the cylinder of the filter are perpendicular to the forward direction of the water flow. The water collector is set on the cylinder, so that the radial filter of the present invention can obtain several times the filtration area of the filter of the same size as the prior art, and the thickness of the filter layer can also be guaranteed. The backwash flow of the backwash water is only a fraction of the filtration flow, and the inlet water flow alone is sufficient to rinse the filter material clean, and there is no need to set up a special backwash water tank, backwash water pump and large-diameter pipe valve. Because the height size of the radial flow filter is relatively unrestricted, a larger filtration area can be easily obtained by increasing the height, and the backwash flow does not need to be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a partially exploded schematic diagram of the three-dimensional structure of the radial filter of the present invention;

[0032] Figure 2This is a structural diagram of the first embodiment of the radial filter of the present invention, in which the water collector, the water outlet pipe, and the cylinder cooperate;

[0033] Figure 3 This is a structural diagram of a second embodiment of the radial filter of the present invention, in which the water collector, the water outlet pipe, and the cylinder cooperate;

[0034] Figure 4 This is a schematic diagram of water flow during the filtering operation of the radial filter of the present invention;

[0035] Figure 5 Schematic diagram of water flow in the backflushing state of the radial filter of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] Please refer to Figure 1 As shown, the present invention provides a radial filter 100, including: a filter cartridge 1, a water inlet pipe 2, a backwash drain pipe 3, a backwash water inlet pipe 4, a water outlet pipe 5, a backwash water distributor 6, a sewage pipe 7, filter material 8, a deflector 9, a water distribution trough 10, a water collector 11, and a water collection and confluence trough 12.

[0038] The filter cartridge 1 comprises a body 1001 with a closed bottom and an open top, and a head 1002 fixed to the open end of the body 1001. The two can be detachably connected, forming a seal when fixedly connected. Alternatively, the body 1001 and head 1002 can be integrally formed, meaning that when the body 1001 is relatively tall, the head 1002 can be incorporated into the body 1001. The filter cartridge 1 can be round, square, or other irregular shapes, and can be a pressurized, sealed container or an open container.

[0039] The water inlet pipe 2 is provided at one end of the cylinder 1001 close to the sealing head 1002 . The water inlet pipe 2 passes through the cylinder 1001 and is connected to the inside of the cylinder 1001 for connecting to a water source to be filtered.

[0040] The backwash drain pipe 3 is provided at one end of the cylinder 1001 close to the head 1002. The backwash drain pipe 3 passes through the cylinder 1001 and is connected to the inside of the cylinder 1001 for draining the wastewater generated when backwashing the filter material 8. The backwash drain pipe 3 is horizontally spaced apart from the water inlet pipe 2.

[0041] The backwash water inlet pipe 4 is arranged at the bottom end of the cylinder 1001 and passes through the cylinder 1001, and is used to connect to a cleaning water source when backwashing the filter material 8.

[0042] The water outlet pipe 5 is arranged near the bottom end of the cylinder 1001 and passes through the cylinder 1001, and is used to transport the clean water collected after filtering.

[0043] The backwash water distributor 6 is arranged at the bottom of the cylinder 1001 and is connected to the backwash water inlet pipe 4.

[0044] In this embodiment, the backwash water distributor 6 is a conventional structure. For example, one common structure is a water distributor structure assembled from multiple branch pipes with fine holes, where the holes are smaller than the filter media particles. For example, another common structure is composed of multiple layers of graded support layers with varying particle sizes. The particles in each support layer are larger than the filter media particles, and the size of the support particles gradually increases from slightly larger than the filter media particles. This allows water to flow through the filter media and the support layers, preventing the filter media from flowing through the support layers.

[0045] The sewage pipe 7 is arranged at the bottom of the cylinder 1001 and passes through the cylinder 1001 .

[0046] The filter material 8 is a granular filter material, which is filled in the cylinder 1001 and covers the backwash water distributor 6 .

[0047] In this embodiment, the filter material 8 is quartz sand with a particle size of 0.6-1.2 mm, or anthracite with a particle size of 0.8-1.8 mm.

[0048] The deflector 9 is a hollow cylindrical structure with one end open and the other end closed, and is used to guide the incoming water into the deep part of the filter material 8, so that radial flow filtration is formed in the filter material.

[0049] The closed end of the deflector 9 is inserted into the filter media along the axial direction of the cylindrical body 1001. The deflector 9 extends above and is spaced apart from the backwash distributor 6. In this embodiment, the deflector 9 is provided with a plurality of deflector filter holes (not shown) extending therethrough. The pore size of these deflector holes is smaller than the particle size of the filter media 8. The drain pipe 7 extends through the closed end of the deflector 9 and communicates with the deflector 9, removing impurities that may have entered the deflector 9 and preventing clogging of the deflector 9.

[0050] In this embodiment, the deflector 9 is preferably a cylindrical structure made of smooth expanded metal. The mesh openings on the expanded metal serve as the deflector's filter holes. Their width is smaller than the minimum particle size of the filter media, and the total mesh area is large enough to allow raw water to evenly pass through the mesh and enter the depths of the filter media 8 without creating excessive flow resistance. The smooth expanded metal surface prevents small particles of filter media 8 from becoming trapped in the mesh, facilitating a clean flushing of the deflector 9 during each backflushing operation.

[0051] During operation of the radial filter 100, water enters the deflector 9 from above, then flows outward through the filter pores of the deflector 9 into the filter media 8. To ensure uniform water flow distribution, in this embodiment, the initial flow velocity at the water inlet end of the deflector 9 is set to approximately 0.5 m / s. When processing large volumes of water, multiple deflectors 9 may need to be installed simultaneously to meet the required inlet flow rate.

[0052] The water distribution trough 10 is annular and flush with the water inlet pipe 2. It is sleeved and fixed to the deflector 9 and separated from the filter material 8. The inner circumference of the water distribution trough 10 is affixed to the deflector 9, and the outer circumference of the water distribution trough 10 is separated from the cylindrical body 1001 to form a water flow gap 1003. Water entering from the water inlet pipe 2 rises upward through the water flow gap 1003 and flows into the water distribution trough 10 and the deflector 9. The bottom of the water distribution trough 10 is provided with a plurality of bottom filter holes (not shown) extending therethrough, and the outer circumference of the bottom of the water distribution trough 10 extends to abut and abut against the cylindrical body 1001.

[0053] More preferably, the top surface of the water distribution trough 10 is lower than the top surface of the deflector 9 to prevent the filter material 8 that may be carried by the water flow during backflushing from entering the deflector 9.

[0054] The water collector 11 is annular and coaxially arranged with the cylinder 1001. The water collector is located between the inner side wall of the cylinder 1001 and the filter material 8 and is fixed to the cylinder 1001. The water collector 11 has a clean water collection space 111 extending along its axial direction. The top end of the clean water collection space 111 is closed and the bottom end is open.

[0055] The water collector 11 is provided with a plurality of water collector filter holes (not shown) extending therethrough. The water collector filter holes are in the shape of long strips extending along the axial direction of the water collector 11, and the width of the water collector filter holes is smaller than the particle size of the filter material 8, thereby preventing the filter material 8 from entering. The water collector 11 is embedded in the filter material 8, and a safety distance is maintained between the top of the water collector 11 and the top surface of the filter material 8. This ensures that the filter material 8 above the water collector 11 also has a filtering and protective function, preventing the water flow entering the water collector 11 from above the filter material 8 from short-circuiting. In this embodiment, the safety distance is not less than 500 mm, that is, the thickness of the filter material 8 above the water collector 11 is not less than 500 mm.

[0056] The water collector 11 is made of a metal plate with a smooth surface. Its principle is the same as that of the deflector 9 and will not be repeated here.

[0057] In the radial filter 100 of the present invention, the water collector 11 provides two implementations:

[0058] like Figure 2As shown, the water collector 11 includes a plurality of long strips of metal plates 1101 extending axially along the cylinder 1001. The plurality of metal plates 1101 are distributed radially along the cylinder 1001 and intersect with each other to form an angle, so that the plurality of metal plates 1101 are sequentially connected end to end to form a ring-shaped wave structure plate. The trough position of the wave structure plate is fixed to the cylinder 1001, and the crest position of the wave structure plate faces the central axis of the cylinder 1001. The water collector filter hole is opened in each of the metal plates 1101. The two metal plates 1101 at the same crest of the wave structure plate and the cylinder 1001 together enclose a clean water collection space 111. In this embodiment, the metal plate 1101 can be a whole piece of wave structure plate formed by bending at intervals, or it can be formed by multiple metal plates with a width of several tens of millimeters fixed to each other. After being set, the wave structure has high mechanical strength, which is sufficient to withstand the pressure acting on the water collector 11 caused by the clogging of the filter material 8 when the radial filter 100 is in operation.

[0059] like Figure 3 As shown, the water collector 11 includes a plurality of long metal tubes 1101' extending axially along the cylinder 1001. The plurality of metal tubes 1101' are spaced apart and together form a ring-shaped structure. The water collector filter holes are provided in each of the metal tubes 1101'. Each of the metal tubes 1101' is fixed to the cylinder 1001, and a clean water collection space 111 is formed inside each of the metal tubes 1101'. In order not to significantly affect the uniformity of the thickness of the filter material 8, the diameter of the metal tubes 1101' should not be too large. In this embodiment, the diameter of the metal tubes 1101' is less than or equal to 50 mm, the spacing between the metal tubes 1101' is not greater than the expanded circumference of the metal tubes 1101', and the lower limit of the total number of metal tubes 1101' is the quotient obtained by dividing the diameter of the radial filter 100 by the diameter of the metal tubes 1101'.

[0060] The water collecting and converging groove 12 is annular and is coaxially arranged with the cylinder 1001 . The water collecting and converging groove 12 is located between the inner wall of the cylinder 1001 and the filter material 8 and is fixed to the cylinder 1001 .

[0061] The bottom of the water collecting and converging trough 12 is further away from the backwash water distributor 6 than the bottom of the guide device 9. The top of the water collecting and converging trough 12 is fixedly connected to the water collector 11 and the two are interconnected. The outlet pipe passes through the water collecting and converging trough and is interconnected. In this embodiment, specifically, the top of the water collecting and converging trough 12 is provided with a plurality of through holes (not shown) passing through it. The position and size of the through holes correspond to the clean water collection space 111. The bottom end of the water collector 11 is fixed to the top of the water collecting and converging trough 12. The water collecting and converging trough 12 is connected to the clean water collection space 111 through the through holes. Water can be collected in the water collecting and converging trough 12, and the filter material 8 will not pass through the water collecting and converging trough 12. Of course, it is easy to think of that the fixed connection between the two is sealed.

[0062] The water collecting and converging groove 12 is flush with the water outlet pipe 5 , and the height of the water collecting and converging groove 12 along the axial direction of the cylinder 1001 is greater than or equal to the diameter of the water outlet pipe 5 , so that water outlet is smoother.

[0063] More preferably, a plurality of water collecting and converging tank filter holes (not shown) are provided on one side of the water collecting and converging tank 12 close to the central axis of the cylinder 1001, so as to further increase the radial flow area by utilizing the height of the water collecting and converging tank 12.

[0064] Combine Figure 4 As shown, when the radial filter is in operation, the direction of water flow is as indicated by the arrow. Most of the water flows in from the water inlet pipe 2, enters the deflector 9 from the top open end of the deflector 9 through the water flow gap 1003, and then flows out from the deflector filter holes of the deflector 9 from the inside to the outside into the filter material 8, forming a radial water flow. After radial filtration, it enters the water collector 11, and then flows downward into the water collection and confluence tank 12, and the filtered clean water is discharged from the outlet pipe 5. A small part of the water flow enters the water distribution trough 10 from the notch at the top of the water distribution trough 10 through the water flow gap 1003, and then enters the filter material 8 through the bottom filter holes at the bottom of the trough, forming a vertical water flow. After vertical filtration, it enters the water collector 11 radially, and then flows downward into the water collection and confluence tank 12. The filtering area of the radial filter 100 is the sum of the filtering areas of the radial water flow filtration and the vertical water flow filtration. Therefore, compared with the filter of the same size in the prior art, the radial filter 100 effectively increases the filtering area and filtering effect.

[0065] Combine Figure 5As shown, when the radial filter is backflushed, the water flow direction is as shown by the arrow, and the backwash water enters from the backwash inlet pipe 4, flows vertically upward through the filter material 8 through the backwash water distributor 6, and enters the water distribution trough 10 through the bottom filter hole opened at the bottom of the water distribution trough 10. At the same time, the impurities on the top surface of the filter material 8 are flushed into the water distribution trough 10, and then overflow from the notch at the top thereof and discharged from the backwash drain pipe 3; in addition, a small part of the backwash water flows radially into the deflector 9 when passing through the filter material 8, thereby flushing away the impurities attached to the inner surface of the deflector 9, and discharged from the sewage pipe 7.

[0066] The water distribution trough 10 is used to evenly collect the rising water flow of the backwash during backwashing, and to merge the backwash water into the backwash drain pipe 3 for discharge. In this embodiment, the position of the notch on the top surface of the water distribution trough 10 is higher than the maximum height of the filter material 8 during backwash expansion, so the filter material 8 will not flow out of the water distribution trough 10 during backwashing.

[0067] Comparison of the actual use of the radial filter 100 of the present invention and the filter of the prior art:

[0068] Calculated based on the same flushing duration, the flushing water volume of the radial filter 100 of the present invention is only 20% of that of an ordinary filter. If the filter is backflushed once a day and each flushing lasts 6 minutes, the radial flow filter will consume 10.8 tons of backflushing water, which can save 43.2 tons of flushing water each time and 15,768 tons of flushing water each year, with obvious economic and environmental benefits.

[0069] Taking a filter with a diameter of D and a water collector height equal to D as an example, the filtration area of the filter in the prior art is (1 / 4)πD 2 The downward flow filtration area of the radial flow filter 100 of the present invention is also (1 / 4)πD 2 , but its radial filtration area is πD 2 , then the total filtration area is the sum of the two, that is (1 / 4)πD 2 +πD 2 =(5 / 4)πD 2 Compared with the conventional filter, the filtration area of the radial flow filter of the present invention is 5 times that of the conventional filter.

[0070] The backwash area of the radial flow filter of the present invention is (1 / 4)πD 2 , the filtration area is 5 times the backflushing area, that is to say, the operating flow rate is 5 times the backflushing flow rate, which is sufficient to meet the backflushing needs.

[0071] Calculation results show that under the condition of the same filter diameter, the radial filter technology of the present invention can obtain a filtration area several times larger than that of the traditional downward flow technology.

[0072] If the height of the water collector is increased further, the radial flow structure can obtain a larger filtration area while the backwash area remains unchanged.

[0073] For example, taking a 100t / h sand (filter material) filter as an example, in this field, the building water supply design specification requires that the filtration speed is generally not more than 10m / h. The filtration area corresponding to this filtration speed is 10m 2 To achieve this area, a conventional filter would need to have a diameter of 3.6m. This diameter is close to the upper limit of road transport dimensions and is inconvenient to transport.

[0074] Design specifications require a recoil velocity of 54 m / h, or 5.4 times the operating flow rate. This corresponds to a recoil water flow rate of 540 t / h. To achieve this flow rate, the corresponding recoil pump typically requires 22-30 kW of power, requiring a dedicated three-phase power supply, which is inconvenient.

[0075] Current technical specifications dictate that backflushing a filter requires at least six minutes, theoretically consuming 54 cubic meters of water. In reality, for safe operation, the water tank must hold significantly more water than this theoretical consumption, requiring a backflushing tank of at least 100 cubic meters. If the water depth is three meters, the required area is 33.3 square meters. Furthermore, factors such as the thickness of the tank, the working channel, and the location of the pump and piping require a total area of at least 50 to 60 square meters, resulting in high operational costs.

[0076] Accordingly, the radial filter 100 of the present invention is a radial flow filter with a diameter of 1.6 m and an effective cross-sectional area of 1.8 m. 2 When the side water collection height is 1.63m, the side water collection area is 8.2m 2 , total filtration area 10 m 2 , thus achieving the same filtration area as a 3.6m diameter filter. Backwash area 1.8 m 2 In this case, the backwash flow rate of 54m / h corresponds to a backwash water flow rate of 97t / h. The inlet water flow rate of 100t / h has met the backwash flow requirement, and there is no need to set up a backwash water tank and backwash water pump separately.

[0077] The water flow of the radial flow filter 100 diffuses from the central axis to the periphery of the cylinder. The effective filter layer thickness of the radial filtration with a diameter of 1.6m can be maintained at about 0.6m, which is equivalent to the filter material thickness of the filter in the prior art.

[0078] Comparing the above calculation results, the radial filter 100 of the present invention has a diameter of only 44% of that of conventional filters, while maintaining the same processing capacity and filtration area, and occupies only 20% of the projected area. Furthermore, the radial filter 100 of the present invention does not require a backflush tank, backflush pump, or large-diameter backflush pipe valves, simplifying the piping system, significantly reducing costs, and significantly simplifying transportation and handling.

[0079] Compared with the prior art, the radial filter of the present invention, through the coordination of structures such as the guide and the water collector, transforms the filtration from a planar structure to a three-dimensional structure, and the water flow is changed from up and down flow to radial flow. The upper and lower water-facing surfaces of the radial filter and the outer periphery of the cylinder of the filter are perpendicular to the forward direction of the water flow. The water collector is set on the cylinder, so that the radial filter of the present invention can obtain several times the filtration area of the filter of the same size as the prior art, and the thickness of the filter layer can also be guaranteed. The backwash flow of the backwash water is only a fraction of the filtration flow, and the inlet water flow alone is sufficient to rinse the filter material clean, and there is no need to set up a special backwash water tank, backwash water pump and large-diameter pipe valve. Because the height size of the radial flow filter is relatively unrestricted, a larger filtration area can be easily obtained by increasing the height, and the backwash flow does not need to be increased. Furthermore, the radial filter's water flow velocity gradually decreases, starting with a higher initial velocity. This helps impurities penetrate deeper into the filter layer, improving filter media utilization. As the flow velocity decreases, the filtration effect improves, ultimately outperforming conventional filters and significantly increasing their media interception capacity. This greater interception capacity translates to a longer filter cycle and fewer backflushes, resulting in more effective filter operation and less backflushing wastewater.

[0080] If the filter media particle uniformity is not ideal, there will be a lot of fine filter media mixed in with the normal-sized filter media. In this case, after backflushing, the fine filter media will concentrate at the top of the filter layer. During operation, impurities in the water will first contact the fine filter media, quickly clogging the filter layer. The normal-sized filter media at the bottom will have little effect, resulting in frequent backflushing of the filter. However, the water flow direction of the radial filter is inconsistent with the backflushing direction. The raw water is directly introduced into the deep filter layer. Although backflushing also causes the fine filter media to concentrate at the top of the filter layer, it only causes the small area of filter media at the top to fail prematurely. The normal-sized filter media that makes up the majority of the filter media deep in the filter layer can still be used normally. The phenomenon of abnormal failure caused by uneven filter media particles becomes less important, and the radial flow filter can still maintain an operating cycle close to that of the ideal-sized filter media.

[0081] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A radial filter, characterized in that: include: The filter cartridge comprises a cylindrical body with a closed bottom end and an open top end, and a sealing head fixed to the open end of the cylindrical body; A water inlet pipe is provided at one end of the cylinder close to the sealing head, and the water inlet pipe passes through the cylinder and is connected to the cylinder; A backwash drain pipe is provided at one end of the cylinder body close to the sealing head, passes through the cylinder body and is connected to the cylinder body, and is horizontally spaced apart from the water inlet pipe; a backwash water inlet pipe, the backwash water inlet pipe being arranged at the bottom end of the cylinder and passing through the cylinder; a water outlet pipe, the water outlet pipe being arranged near the bottom end of the cylinder and passing through the cylinder; A backwash water distributor, which is arranged at the bottom of the cylinder and is connected to the backwash water inlet pipe; A sewage pipe is provided at the bottom of the cylinder and passes through the cylinder; Filter material, the filter material is a granular filter material, the filter material is filled in the cylinder and the backwash water distributor is buried; The deflector is a hollow cylindrical structure with one end open and the other end closed. The closed end of the deflector is inserted into the filter material along the axial direction of the cylinder. The deflector extends above the recoil water distributor and is spaced therefrom. The circumference of the deflector is provided with a plurality of deflector filter holes penetrating therethrough. The pore size of the deflector filter holes is smaller than the particle size of the filter material. The sewage pipe passes through the closed end of the deflector and is connected to the deflector. A water distribution trough, the water distribution trough is annular and flush with the water inlet pipe, the water distribution trough is sleeved and fixed on the deflector and spaced from the filter material, the inner circumference of the water distribution trough is fitted and fixed to the deflector, the outer circumference of the water distribution trough is spaced from the cylinder to form a water flow gap, the bottom of the water distribution trough is provided with a plurality of bottom filter holes passing therethrough, and the outer circumference of the bottom of the water distribution trough extends to abut and be fixed to the cylinder; A water collector, the water collector is annular and is coaxially arranged with the cylinder, the water collector is located between the inner side wall of the cylinder and the filter material and is fixed to the cylinder, the water collector has a clean water collection space extending along its axial direction, the top end of the clean water collection space is closed and the bottom end is open; the water collector is provided with a plurality of water collector filter holes running through it, the water collector filter holes are in the shape of long strips extending along the axial direction of the water collector and the width of the water collector filter holes is smaller than the particle size of the filter material; the water collector is buried in the filter material and the top end of the water collector is separated from the top surface of the filter material by a safe distance; and, The water collecting and merging trough is annular and coaxially arranged with the cylinder. The water collecting and merging trough is located between the inner wall of the cylinder and the filter material and is fixed to the cylinder. The bottom of the water collecting and merging trough is farther away from the recoil water distributor than the bottom of the deflector. The top of the water collecting and merging trough is fixedly connected to the water collector and the two are interconnected. The outlet pipe passes through the water collecting and merging trough and is interconnected.

2. The radial filter according to claim 1, characterized in that The top of the water collecting and converging trough is provided with a plurality of through holes penetrating therethrough, the positions and sizes of the through holes correspond to the clean water collecting space, and the water collecting and converging trough is connected to the clean water collecting space through the through holes.

3. The radial filter according to claim 2, characterized in that The water collecting and converging trough is flush with the water outlet pipe, and the height of the water collecting and converging trough along the axial direction of the cylinder is greater than or equal to the diameter of the water outlet pipe.

4. The radial filter according to claim 1, characterized in that A plurality of water collecting and converging tank filter holes are provided on one side of the water collecting and converging tank close to the central axis of the cylinder.

5. The radial filter according to claim 1, characterized in that The water collector includes a plurality of long metal plates extending along the axial direction of the cylinder, and the plurality of metal plates are distributed along the radial direction of the cylinder and intersect with each other to form an angle, and the plurality of metal plates are sequentially connected end to end to form a ring-shaped wave structure plate, the trough position of the wave structure plate is fixed to the cylinder, and the crest position of the wave structure plate is toward the central axis of the cylinder; the water collector filter hole is opened on each of the metal plates, and the two metal plates on the same crest of the wave structure plate and the cylinder together form a clean water collection space.

6. The radial filter according to claim 1, characterized in that The water collector includes a plurality of long metal tubes extending along the axial direction of the cylinder. The plurality of metal tubes are arranged at intervals and together form a ring structure. The water collector filter hole is opened in each of the metal tubes. Each of the metal tubes is fixed to the cylinder, and a clean water collection space is formed inside each of the metal tubes.

7. The radial filter according to claim 5 or 6, characterized in that The deflector is a cylindrical structure made of a metal plate mesh with a smooth surface; the water collector is made of a metal plate with a smooth surface.

8. The radial filter according to claim 6, characterized in that The diameter of the metal tube is less than or equal to 50 mm.

9. The radial filter according to claim 1, characterized in that The top surface of the water distribution and sump is lower than the top surface of the deflector.

10. The radial filter according to claim 1, characterized in that The filter material is quartz sand with a particle size of 0.6-1.2 mm, or anthracite with a particle size of 0.8-1.8 mm.

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