CN113926243A

CN113926243A - Radial filter

Info

Publication number: CN113926243A
Application number: CN202111463104.2A
Authority: CN
Inventors: 侯建雄
Original assignee: Foshan Zhongshun Water Treatment Technology Co ltd
Current assignee: Foshan Zhongshun Water Treatment Technology Co ltd
Priority date: 2021-05-10
Filing date: 2021-12-03
Publication date: 2022-01-14
Also published as: CN113209706A

Abstract

The invention provides a radial filter, which comprises a filter cartridge, a water inlet pipe, a backflushing water discharge pipe, a backflushing water inlet pipe, a water outlet pipe, a backflushing water distributor, a blow-off pipe, a filter material, a flow guider, a water distribution and collection tank, a water collector and a water collection and combination tank, wherein the filter material is arranged in the backflushing water distributor; the water flow is guided into the deep part of the filter material by the flow guider to form radial filtration, and meanwhile, the water flow is guided into the filter material from top to bottom by the water distribution and collection tank to form vertical filtration, so that the filtration area is effectively increased, and the filtration effect and efficiency are improved; the backflushing flow of the backflushing water is only a fraction of the filtering flow, the filtering material can be washed clean only by the water inlet flow, a special backflushing water tank, a backflushing water pump and a large-caliber pipeline valve are not needed to be arranged, the height of the backflushing water flowing through the filter in the radial direction is not limited, a larger filtering area can be obtained easily by increasing the height, and the backflushing flow does not need to be increased.

Description

Radial filter

Technical Field

The invention relates to the field of filter equipment, in particular to a radial filter.

Background

The most common principle of a filter for purifying water quality is that a filter layer (such as granular filter materials like quartz sand) is filled in the filter, water to be filtered flows through the filter material layer from top to bottom, dirt in the water is intercepted on the filter material, and the flowing water becomes clear. After the filter is used for a period of time, more and more dirt is trapped on the filter material, and finally the filter layer is blocked, so that the filter can not be used any more. At this moment, backflushing is needed, water flows through the filter material layer from bottom to top, the filter material layer is expanded and loosened by the scouring force of upward water flow, dirt trapped in the filter material rises along with the water flow to separate from the filter layer and is discharged out of the filter along with the water flow, and the filter layer recovers the filtering capacity after backflushing. Such back flushing is often performed and the filter can be used for a long period of time.

Thus, the filtering capacity of the prior art filter is determined by the filtering area of the filter material, which is the cross-sectional area of the filter material perpendicular to the direction of water flow. When the amount of water to be treated is large, the filter needs to have a large filtering area, and accordingly, the size of the filter needs to be large, or a plurality of filters need to be used in cooperation. Because the specific gravity of the commonly used sand filter material is larger than that of water, the specific gravity is usually 2.5-2.7, in order to clean the filter material, the backflushing water flow from bottom to top must be large enough to enable a sand layer naturally accumulated at the bottom of the filter to expand and tumble, and therefore impurities can be flushed out by the water flow.

However, the prior art filter has the following disadvantages:

if a large amount of water is required, the filter is very large in size, and the large size causes difficulty in manufacturing and transportation; the larger the size of the filter is, the more difficult the backflushing water flow is to be uniform in a large area range, the filter material cannot be washed cleanly due to the nonuniform water flow, and the filter material can be damaged or lost due to the disorder of the layered bearing structure of the filter material; in the back flushing process, in order to enable the filter material to achieve the necessary expansion effect, the back flushing water flow is much larger than the running flow, usually 5-6 times, so that the back flushing water source of the filter cannot use the raw water to be filtered, and a back flushing water pool and a back flushing water pump are additionally arranged to pump water from the back flushing water pool for back flushing. The power of a backwashing water pump is much larger than that of a raw water pump, the caliber of a valve of a backwashing water pipeline is much larger than that of a water inlet pipeline, the cost of a backwashing system is high, the occupied area is large, the electrical control difficulty is large, a backwashing water pool cannot be arranged due to the fact that a use site does not have site conditions, and a large-power supply cannot be matched with the backwashing water pump in many cases; the back flushing consumes a large amount of back flushing water, the back flushing water contains a large amount of impurities, and the back flushing water is only directly discharged without a special water recovery facility, so that a large amount of water resource waste is caused.

Therefore, there is a need to provide a new radial filter to solve the above problems.

Disclosure of Invention

The invention aims to solve the technical problem of providing a radial filter which has large filtering area, small backwashing water consumption and good backwashing effect under the condition of the same volume specification.

In order to solve the above technical problem, the present invention provides a radial filter, including:

the filter cartridge comprises a cylinder body with a closed bottom end and an open top end and a seal head which is covered and fixed at the open end of the cylinder body;

the water inlet pipe is arranged at one end, close to the end socket, of the cylinder body, and penetrates through the cylinder body and is communicated into the cylinder body;

the backflushing water discharging pipe is arranged at one end, close to the end socket, of the barrel body, penetrates through the barrel body and is communicated into the barrel body, and the backflushing water discharging pipe and the water inlet pipe are horizontally arranged at intervals;

the backflushing water inlet pipe is arranged at the bottom end of the barrel and penetrates through the barrel;

the water outlet pipe is arranged on the cylinder body close to the bottom end of the cylinder body and penetrates through the cylinder body;

the backflushing water distributor is arranged at the bottom in the barrel and is communicated with the backflushing water inlet pipe;

the blow-off pipe is arranged at the bottom of the barrel and penetrates through the barrel;

the filter material is granular and is filled in the cylinder body, and the backflushing water distributor is buried and covered;

the fluid director is of a hollow cylindrical structure with one open end and one closed end, the closed end of the fluid director is inserted into the filter material along the axial direction of the cylinder, and the fluid director extends to the upper part of the backflushing water distributor and is spaced from the backflushing water distributor; a plurality of fluid director filtering holes penetrating through the fluid director are formed in the peripheral side of the fluid director, and the aperture of each fluid director filtering hole is smaller than the particle size of the filter material; the drainage pipe penetrates through the closed end of the fluid director and is communicated with the fluid director;

the water distribution and collection tank is annular and is horizontally flush with the water inlet pipe, the water distribution and collection tank is sleeved and fixed on the fluid director and is spaced from the filter material, the inner peripheral side of the water distribution and collection tank is attached and fixed on the fluid director, the outer peripheral side of the water distribution and collection tank is spaced from the barrel to form a water flow gap, the tank bottom of the water distribution and collection tank is provided with a plurality of tank bottom filter holes penetrating through the tank bottom, and the outer periphery of the tank bottom of the water distribution and collection tank extends to be abutted and fixed on the barrel;

the water collector is annular and is coaxially arranged with the barrel, the water collector is positioned between the inner side wall of the barrel and the filter material and is fixed on the barrel, the water collector is provided with a clear water collecting space extending along the axial direction of the water collector, and the top end of the clear water collecting space is closed and the bottom end of the clear water collecting space is opened; the water collector is provided with a plurality of water collector filtering holes which penetrate through the water collector, the water collector filtering holes are in a strip shape which extends along the axial direction of the water collector, and the width of the water collector filtering holes is smaller than the grain size of the filter material; the water collector is embedded in the filter material, and a safe distance is reserved between the top end of the water collector and the top surface of the filter material; and the number of the first and second groups,

the water collecting and converging tank is annular and is arranged coaxially with the cylinder, and the water collecting and converging tank is positioned between the inner side wall of the cylinder and the filter material and is fixed on the cylinder; the bottom of the water collecting and merging tank is farther away from the backflushing water distributor than the bottom of the fluid director, the top of the water collecting and merging tank is fixedly connected with the water collector and enables the water collector and the water collector to be communicated with each other, and the water outlet pipe penetrates through the water collecting and merging tank and is communicated with each other.

Preferably, the top of the water collecting and merging tank is provided with a plurality of through holes penetrating through the water collecting and merging tank, the positions and the sizes of the through holes correspond to those of the water collecting space, and the water collecting and merging tank is communicated with the water collecting space through the through holes.

Preferably, the water collecting and converging groove is horizontally flush with the water outlet pipe, and the height of the water collecting and converging groove in the axial direction of the cylinder body is larger than or equal to the pipe diameter of the water outlet pipe.

Preferably, one side of the water collecting and merging tank, which is close to the central shaft of the cylinder body, is provided with a plurality of water collecting and merging tank filtering holes which penetrate through the water collecting and merging tank.

Preferably, the water collector comprises a plurality of strip-shaped metal plates extending along the axial direction of the cylinder, the metal plates are distributed along the radial direction of the cylinder and are intersected with each other to form an included angle, the metal plates are sequentially connected end to form an annular wave structure plate, the wave trough position of the wave structure plate is fixed on the cylinder, and the wave crest position of the wave structure plate faces the central shaft of the cylinder; the water collector filtering holes are formed in each metal plate, and the two metal plates with the same wave crest on the wave structure plate and the barrel body jointly enclose a clear water collecting space.

Preferably, the water collector comprises a plurality of metal tubes which extend along the axial direction of the barrel and are in a long strip shape, the metal tubes are arranged at intervals and jointly enclose an annular structure, the water collector filtering holes are formed in each metal tube, each metal tube is fixed to the barrel, and a clear water collecting space is formed inside each metal tube.

Preferably, the fluid director is a cylindrical structure made of a metal expanded metal with a smooth surface; the water collector is made of a metal plate with a smooth surface.

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

Preferably, the top surface of the water distribution and collection tank is lower than the top surface of the flow guider.

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

Compared with the prior art, the radial filter converts the filtering from a plane structure into a three-dimensional structure through the structural matching of the fluid director, the water collector and the like, changes the water flow from up-down flow to radial flow, ensures the thickness of the filter layer to be several times of the filtering area of the radial filter compared with the filter with the same size in the prior art, ensures the backflushing flow of the backflushing water to be only a fraction of the filtering flow, and can wash the filter material only by the water inlet flow without arranging a special backflushing water pool, a backflushing water pump and a large-caliber pipeline valve. Because the height dimension of the radial flow filter is relatively unlimited, a larger filtering area can be easily obtained by increasing the height, and the backflushing flow does not need to be increased.

Drawings

FIG. 1 is a partially exploded perspective view of a radial filter according to the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of the radial filter of the present invention in which a water collector is engaged with a water outlet pipe and a cylinder;

FIG. 3 is a schematic structural view of a water collector, a water outlet pipe and a cylinder of the radial filter according to the second embodiment of the present invention;

FIG. 4 is a schematic view of the water flow of the radial filter of the present invention in a filtration operating condition;

FIG. 5 is a schematic view of the water flow during the backflush state of the radial filter of the present invention.

Detailed Description

The invention will be further explained with reference to the drawings and the embodiments.

Referring to fig. 1, the present invention provides a radial filter 100, comprising: the device comprises a filter cartridge 1, a water inlet pipe 2, a backflushing water discharge pipe 3, a backflushing water inlet pipe 4, a water outlet pipe 5, a backflushing water distributor 6, a blow-off pipe 7, filter materials 8, a fluid director 9, a water distribution and collection tank 10, a water collector 11 and a water collection and combination tank 12.

The filter cartridge 1 comprises a cylinder 1001 with a closed bottom end and an open top end and a seal head 1002 covering and fixed at the open end of the cylinder 1001. The two can be for dismantling the connection, form sealedly when fixed connection, of course, barrel 1001 and head 1002 also can be integrative structure, and when the height of barrel 1001 was higher, can regard head 1002 as a partial structure of barrel 1001. The filter cartridge 1 may be round, square or other irregular shape, and may be a pressurized closed container or an open container.

The water inlet pipe 2 is arranged at one end, close to the seal head 1002, of the cylinder 1001, and the water inlet pipe 2 penetrates through the cylinder 1001 and is communicated into the cylinder 1001 for connecting a water source to be filtered.

The backflushing drain pipe 3 is arranged at one end, close to the end socket 1002, of the cylinder 1001, and the backflushing drain pipe 3 penetrates through the cylinder 1001 and is communicated into the cylinder 1003 and is used for backflushing waste water generated when the filter material 8 is washed. The backflushing drain pipe 3 and the water inlet pipe 2 are horizontally arranged at intervals.

The backflushing water inlet pipe 4 is arranged at the bottom end of the cylinder 1001, penetrates through the cylinder 1001 and is used for being connected with a cleaning water source when the filter material 8 is backflushed and cleaned.

The water outlet pipe 5 is arranged on the cylinder 1001 near the bottom end thereof and penetrates through the cylinder 1001, and is used for conveying out the filtered and collected clean water.

The backflushing water distributor 6 is arranged at the bottom in the barrel 1001 and is communicated with the backflushing water inlet pipe 4.

In this embodiment, the back flush water distributor 6 is a structure of the prior art. For example, one of the common structures is a water distributor structure assembled by a plurality of branch pipes with fine pores, and the size of the pores is smaller than that of filter material particles; for example, the second common structure is composed of multiple graded support layers with different particle sizes, the particles of each support layer are larger than the particles of the filtering material, and the size of the support particles is gradually increased from top to bottom from the size slightly larger than the particles of the filtering material, so that water can flow through the filtering material and the support layers, and the filtering material cannot run off from the support layers.

The sewage discharge pipe 7 is arranged at the bottom of the barrel 1001 and penetrates through the barrel 1001.

The filter material 8 is granular filter material, and the filter material 8 is filled in the cylinder 1001 and covers the back-flush water distributor 6 in a buried manner.

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

The fluid director 9 is a hollow cylindrical structure with one open end and one closed end, and is used for guiding inlet water into the deep part of the filter material 8, so that radial flow filtration is formed in the filter material.

The closed end of the fluid director 9 is inserted into the filter material along the axial direction of the cylinder 1001, and the fluid director 9 extends to above and is spaced from the back flush water distributor 6. In this embodiment, a plurality of fluid director filtering holes (not shown) penetrating through the fluid director 9 are formed on the periphery of the fluid director 9, and the aperture of the fluid director filtering holes is smaller than the particle size of the filter material 8. The drainage pipe 7 penetrates through the closed end of the fluid director 9 and is communicated with the fluid director 9, and is used for removing impurities possibly entering the fluid director 9 and preventing the fluid director 9 from being blocked.

In this embodiment, preferably, the fluid director 9 is a cylindrical structure made of a metal expanded metal with a smooth surface. The meshes on the metal plate net are the filter holes of the fluid director, the width of the filter holes is smaller than the minimum particle size of the filter material, and the total area of the meshes is large enough to ensure that raw water uniformly passes through the meshes and enters the deep part of the filter material 8, and meanwhile, too large water flow resistance cannot be generated. The smooth surface of the metal plate net can not clamp small-particle filter materials 8 on meshes, and the surface of the fluid director 9 can be washed clean during each backflushing.

When the radial filter 100 operates, water flow enters the fluid director 9 from the upper part and then flows out from the filtering holes of the fluid director 9 from inside to outside to enter the filtering material 8. In order to make the water flow distribution uniform. In the embodiment, the initial flow rate of the water inlet end of the cylinder body of the fluid director 9 is about 0.5 m/s. When the treated water quantity is large, a plurality of flow deflectors 9 can be required to be installed at the same time to meet the requirement of the inflow water quantity.

The water distribution and collection tank 10 is annular and is horizontally flush with the water inlet pipe 2, and the water distribution and collection tank 10 is fixed on the fluid director 9 in a sleeved mode and is spaced from the filter material 8. The inner peripheral side of the water distribution and collection tank 10 is attached and fixed to the fluid director 9, a water flow gap 1003 is formed between the outer peripheral side of the water distribution and collection tank 10 and the cylinder 1001 at intervals, and water entering the water inlet pipe 2 overflows through the water flow gap 1003 and flows into the water distribution and collection tank 10 and the fluid director 9. The bottom of the water distribution and collection tank 10 is provided with a plurality of tank bottom filtering holes (not shown) penetrating through the tank bottom, and the periphery of the bottom of the water distribution and collection tank 10 extends to be abutted against and fixed on the cylinder 1001.

Preferably, the top surface of the water distribution and collection tank 10 is lower than the top surface of the fluid director 9, so as to prevent the filter material 8 which can be brought up by water flow during backflushing from entering the fluid director 9.

The water collector 11 is annular and coaxial with the cylinder 1001, and is located between the inner side wall of the cylinder 1001 and the filter material 8 and fixed to the cylinder 1001. The sump 11 has a clean water collecting space 111 extending in an axial direction thereof, and the clean water collecting space 111 is closed at a top end and opened at a bottom end.

The water collector 11 is provided with a plurality of water collector filtering holes (not shown) penetrating through the water collector, the water collector filtering holes are in a strip shape extending along the axial direction of the water collector 11, the width of the water collector filtering holes is smaller than the particle size of the filter material 8, and the filter material 8 is prevented from entering. The water collector 11 is buried in the filter material 8 and makes the top end of the water collector 11 and the top surface of the filter material 8 are separated by a safe distance, so that the filter material 8 above the water collector 11 also has a filtering protection effect, and the water flow short circuit entering the water collector 11 from the upper side of the filter material 8 is prevented. In this embodiment, the safety distance is not less than 500mm, that is, the thickness of the filtering material 8 above the water collector 11 is not less than 500 mm.

The water collector 11 is made of a metal plate with a smooth surface, and the principle thereof is the same as that of the fluid director 9, and the details are not repeated herein.

In the radial filter 100 of the present invention, the water collector 11 provides two embodiments:

as shown in fig. 2, the water collector 11 includes a plurality of metal plates 1101 extending in the axial direction of the cylinder 1001 and having a long shape, the plurality of metal plates 1101 being distributed in the radial direction of the cylinder 1001 and two of the metal plates 1101 intersecting each other to form an included angle, so that the plurality of metal plates 1101 are sequentially connected end to form a ring-shaped wave structure plate, a valley position of the wave structure plate is fixed to the cylinder 1001, and a peak position of the wave structure plate faces the central axis of the cylinder 1001. The water collector filtering holes are formed in each metal plate 1101, and the two metal plates 1101 on the same wave crest on the wave structure plate and the cylinder 1001 together enclose the clear water collecting space 111. In this embodiment, the metal plate 1101 may be a single corrugated plate formed by bending at intervals, or a plurality of metal plates having a width of several tens of millimeters may be fixed to each other. The wave structure is arranged to have a high mechanical strength sufficient to withstand the pressure on the water collector 11 caused by the clogging of the filter media 8 during operation of the radial filter 100.

As shown in fig. 3, the water collector 11 includes a plurality of elongated metal tubes 1101 ' extending along the axial direction of the cylinder 1001, the metal tubes 1101 ' are arranged at intervals and jointly enclose an annular structure, the water collector filtering holes are opened in each metal tube 1101 ', each metal tube 1101 ' is fixed to the cylinder 1001, and the clean water collecting space 111 is formed inside each metal tube 1101 '. In order not to significantly affect the uniformity of the thickness of the filter media 8, the diameter of the metal tubes 1101 'is not too large, and in this embodiment, the diameter of the metal tubes 1101' is less than or equal to 50mm, the metal tubes 1101 'are spaced apart by a distance not greater than the expanded circumference of the metal tubes 1101', and the lower limit of the total number of the metal tubes 1101 'is the quotient of the diameter of the radial filter 100 divided by the diameter of the metal tubes 1101'.

The water collecting and converging tank 12 is annular and is arranged coaxially with the cylinder 1001, and the water collecting and converging tank 12 is positioned between the inner side wall of the cylinder 1001 and the filter material 8 and is fixed on the cylinder 1001.

The bottom of the water collecting and merging tank 12 is farther away from the back flush water distributor 6 than the bottom of the fluid director 9. The top of the water collecting and merging tank 12 is fixedly connected with the water collector 11 and enables the water collector and the water collector to be communicated with each other, and the water outlet pipe penetrates through the water collecting and merging tank and is communicated with each other. In this embodiment, specifically, the top of the water collecting and merging tank 12 is provided with a plurality of through holes (not shown) penetrating therethrough, the positions and sizes of the through holes correspond to the water collecting space 111, the bottom end of the water collector 11 is abutted against and fixed to the top end of the water collecting and merging tank 12, the water collecting and merging tank 12 is communicated with the water collecting space 111 through the through holes, water can be collected into the water collecting and merging tank 12, and the filter material 8 cannot penetrate through the water collecting and merging tank 12. Of course, the sealing process at the fixed connection of the two is easily conceivable.

The water collecting and merging groove 12 is horizontally flush with the water outlet pipe 5, and the height of the water collecting and merging groove 12 in the axial direction of the cylinder 1001 is larger than or equal to the pipe diameter of the water outlet pipe 5, so that water outlet is smoother.

Preferably, a plurality of water collecting and merging tank filtering holes (not shown) are formed through one side of the water collecting and merging tank 12, which is close to the central axis of the cylinder 1001, and the radial diameter area is further increased by using the height of the water collecting and merging tank 12.

Referring to fig. 4, when the radial filter operates, the water flow direction is shown by an arrow, most of the water flow flows in from the water inlet pipe 2, enters the fluid director 9 from the top opening end of the fluid director 9 through the water flow gap 1003, then flows out from the filtering holes of the fluid director 9 from inside to outside to enter the filtering material 8, forms radial water flow, enters the water collector 11 after being filtered along the radial direction, then flows downwards into the water collecting and merging tank 12, and the filtered clean water is injected out through the water outlet pipe 5. A small part of water flow enters the water distribution and collection tank 10 from the notch at the top of the water distribution and collection tank 10 through the water flow gap 1003, and then enters the material filter 8 through the filter hole at the bottom of the tank to form vertical water flow, and the vertical water flow enters the water collector 11 along the radial direction after vertical filtration and then flows downwards into the water collection and collection tank 12. The filtering area of the radial filter 100 is the sum of the filtering areas of the radial water flow filtering part and the vertical water flow filtering part, so that compared with the filter with the same size in the prior art, the radial filter 100 effectively increases the filtering area and the filtering effect.

Referring to fig. 5, when the radial filter backflushes, the water flow direction is shown by an arrow, backflush water enters from the backflush water inlet pipe 4, vertically flows upwards through the backflush water distributor 6 and flows through the filter material 8, enters the water distribution and collection tank 10 through the tank bottom filter hole formed in the tank bottom of the water distribution and collection tank 10, and simultaneously flushes impurities on the top surface of the filter material 8 into the water distribution and collection tank 10, overflows from the tank opening at the top of the water distribution and collection tank, and is discharged from the backflush water discharge pipe 3; in addition, when a small part of the backwash water passes through the filter material 8, the backwash water radially flows into the fluid director 9, so that impurities attached to the inner side surface of the fluid director 9 are washed away and discharged through the sewage discharge pipe 7.

The water distribution and collection tank 10 is used for uniformly collecting backflushed ascending water flow during backflushing and converging the backflushed water to the backflush drain pipe 3 for discharging, in the embodiment, the position of the notch on the top surface of the water distribution and collection tank 10 is higher than the maximum height of the filter material 8 during backflushing expansion, and the filter material 8 cannot run off from the water distribution and collection tank 10 during backflushing.

The radial filter 100 of the present invention is in contrast to the practical use of prior art filters:

the amount of flushing water of the radial flow filter 100 of the invention is only 20% of that of a common filter calculated by the same flushing duration, if the filter is backflushed once a day, each flushing lasts for 6 minutes, the radial flow filter consumes 10.8 tons of backflushing water, 43.2 tons of flushing water can be saved each time, 15768 tons of flushing water can be saved each year, and the economic benefit and the environmental protection benefit are obvious.

Taking a filter with a diameter D and a collector height equal to D as an example, the filter area of the prior art filter is (1/4) π D². The downflow filtration area of the radial flow filter 100 of the present invention is also (1/4) π D²But with a radial filter area of π D²The total filtration area is then the sum of the two, i.e., (1/4) π D²+πD²＝（5/4）πD². Compared with the other materials, the present inventionThe filtration area of the open radial flow filter is 5 times that of the conventional filter.

The radial flow filter of the present invention has a back-wash area of (1/4) π D²The filtering area is 5 times of the backflushing area, that is to say the running flow is 5 times of the backflushing flow, which is sufficient to meet the backflushing requirement.

The calculation results show that under the condition of the same filter diameter, the radial filter technology can obtain a filtering area which is several times larger than that of the traditional downward flow technology.

If the height of the water collector is increased again, the radial flow structure can obtain larger filtering area again, and the back flushing area is still kept unchanged.

Such as: taking a sand (filter material) filter with the specification of 100t/h as an example, in the field, the design specification of building water supply requires that the filtering speed is generally not more than 10m/h, and the filtering area corresponding to the filtering speed is 10m². To achieve this area, a conventional filter would need to be 3.6m in diameter. The size of the diameter of 3.6m is close to the upper limit of the size limit of road transportation, and the transportation is inconvenient.

The design specification requires that the backflushing speed is 54m/h, namely 5.4 times of the running flow, and the backflushing speed corresponds to 540t/h of the backflushing water flow. In order to achieve the flow, the power of the corresponding backwash water pump usually needs 22-30 kw, and a special three-phase power supply is needed to meet the power requirement, so that the use is inconvenient.

In the prior art specifications, the backwashing water of the filter takes at least 6 minutes and the theoretical amount of water consumed is 54 cubic meters. In fact, for the safe operation of the equipment, the water storage capacity of the water tank is far larger than the theoretical consumption, and a backflushing water tank with the volume of more than 100 cubic meters is necessary for matching the filter. If the water depth is 3 meters, the required area of the pool is 33.3 square meters, and the factors such as the thickness of the pool, a working channel, a water pump, the installation position of a pipeline and the like are added, the floor area of the pool is at least fifty-ten square meters, and the application cost is high.

Accordingly, the radial filter 100 of the present invention is a radial flow filter with a diameter of 1.6m and an effective cross-sectional area of 1.8m²High water collection on the sideWhen the water reaches 1.63m, the side water collecting area is 8.2m²Total filtration area 10m²This achieves the same filtration area as a 3.6m diameter filter. Recoil area of 1.8m²Under the condition, the back flushing water flow rate is 97t/h corresponding to the back flushing flow rate of 54m/h, the 100t/h flow rate of inlet water meets the back flushing flow rate requirement, and a back flushing water tank and a back flushing water pump do not need to be additionally arranged.

The water flow passing through the filter 100 in radial direction spreads from the center axis to the periphery of the cylinder body, and the effective filter layer thickness of the radial filter with the diameter of 1.6m can be kept about 0.6m, which is equivalent to the filter material thickness of the filter in the prior art.

Compared with the above calculation results, under the premise of the same processing capacity and filtering area, the diameter of the radial filter 100 of the invention is only 44% of that of the common filter, and the floor space projection area is only 20%. In addition, the radial filter 100 of the present invention does not require a back flush tank, a back flush pump, and a large diameter back flush pipe valve to be fitted, the piping system becomes very simple, the manufacturing cost is greatly reduced, and the transportation and handling become very simple.

Compared with the prior art, the radial filter converts the filtering from a plane structure into a three-dimensional structure through the structural matching of the fluid director, the water collector and the like, changes the water flow from up-down flow to radial flow, ensures the thickness of the filter layer to be several times of the filtering area of the radial filter compared with the filter with the same size in the prior art, ensures the backflushing flow of the backflushing water to be only a fraction of the filtering flow, and can wash the filter material only by the water inlet flow without arranging a special backflushing water pool, a backflushing water pump and a large-caliber pipeline valve. Because the height dimension of the radial flow filter is relatively unlimited, a larger filtering area can be easily obtained by increasing the height, and the backflushing flow does not need to be increased. In addition, radial filter's rivers forward speed is degressive gradually, and initial velocity is higher, is favorable to aquatic impurity to go deep into the filter bed depths, improves filter material utilization efficiency, and along with the continuous slow down of rivers speed, quality of water filter effect constantly improves, and final filter effect is superior to ordinary filter, and filter material cuts dirty ability and also obviously is higher than ordinary filter. The larger dirt blocking capacity means that the filter has a longer operation period, the backflushing times are reduced, accordingly, the effective working time of the filter is longer, and the consumption of backflushing drainage is lower.

If the uniformity of the filter material particles is not ideal, a plurality of fine filter materials are mixed in the filter material with the normal particle size, in this case, the fine filter materials are concentrated above the filter layer after the back flushing of the common filter, impurities in water contact the fine filter materials firstly during operation, the filter layer is blocked quickly, the filter material with the normal specification at the bottom layer does not play a role basically, and the frequent back flushing of the filter is caused as a result. The running direction of water flow of the radial filter is different from the backflushing direction, raw water is directly led into the deep part of the filter layer, although backflushing also enables fine filter materials to be concentrated above the filter layer, the result only causes premature failure of the filter materials with small area above, the filter materials occupying most of the normal particle size in the deep part of the filter layer can be normally used, the phenomenon of abnormal failure caused by uneven filter material particles is less important, and the running period of the radial flow filter can still be close to the running period of the filter materials with ideal size.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A radial filter, comprising:

2. The radial filter of claim 1, wherein the top of said water collecting and merging grooves is provided with a plurality of through holes passing therethrough, the positions and sizes of said through holes corresponding to said water collecting space, and said water collecting and merging grooves are communicated with said water collecting space through said through holes.

3. The radial filter of claim 2, wherein the water collecting and merging groove is horizontally flush with the water outlet pipe, and the height of the water collecting and merging groove along the axial direction of the cylinder body is greater than or equal to the pipe diameter of the water outlet pipe.

4. The radial filter of claim 1 wherein said sump has a plurality of sump filter openings therethrough on a side of said sump adjacent said central axis of said barrel.

5. The radial filter of claim 1, wherein the water collector comprises a plurality of metal plates extending along the axial direction of the cylinder and having an elongated shape, the plurality of metal plates are distributed along the radial direction of the cylinder and form an included angle with each other, the plurality of metal plates are sequentially connected end to form a wave structure plate having a ring shape, the trough position of the wave structure plate is fixed to the cylinder, and the crest position of the wave structure plate faces the central axis of the cylinder; the water collector filtering holes are formed in each metal plate, and the two metal plates with the same wave crest on the wave structure plate and the barrel body jointly enclose a clear water collecting space.

6. The radial filter of claim 1, wherein said water collector comprises a plurality of elongated metal tubes extending along the axial direction of said cylindrical body, said metal tubes are spaced apart and together form an annular structure, said water collector filtering hole is opened in each of said metal tubes, each of said metal tubes is fixed to said cylindrical body, and each of said metal tubes forms said clean water collecting space therein.

7. The radial filter of claim 5 or 6, wherein the flow guide is a cylindrical structure made of a metal expanded metal with a smooth surface; the water collector is made of a metal plate with a smooth surface.

8. A radial filter as claimed in claim 6, wherein the diameter of the metal tube is less than or equal to 50 mm.

9. The radial filter of claim 1, wherein the top surface of the water distribution and collection tank is lower than the top surface of the flow guider.

10. The radial filter of claim 1, wherein 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.