CN114307363B - Automatic back flush centrifugation-grit integral filter - Google Patents
Automatic back flush centrifugation-grit integral filter Download PDFInfo
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- CN114307363B CN114307363B CN202111671717.5A CN202111671717A CN114307363B CN 114307363 B CN114307363 B CN 114307363B CN 202111671717 A CN202111671717 A CN 202111671717A CN 114307363 B CN114307363 B CN 114307363B
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Abstract
The invention discloses an automatic backwashing centrifugation-sand integrated filter; wherein the sand filter is arranged in the center, and the centrifugal filters on the same horizontal plane are uniformly arranged outside the sand filter; an outlet at the top of the centrifugal filter is connected with the top of the sand filter tank body through a sand conveying pipe; an additional opening is arranged on the side wall of the cylindrical part of the centrifugal filter so as to be connected with the lower part of the sand filter tank body through a sand discharge pipe and a filter material outlet electromagnetic valve; the uppermost main water inlet pipe is connected with the sand filter through a water inlet three-way electromagnetic valve and a sand filter water inlet pipe, the other outlet of the water inlet three-way electromagnetic valve is connected with a volute-shaped water delivery pipe which is horizontally arranged, and the inner side of the volute-shaped water delivery pipe is connected with a water inlet of the centrifugal filter through a centrifugal filter water inlet pipe. The invention establishes a centrifugal-sand back-flushing operation mode of the heterogeneous filter layer, and the centrifugal filter is a sand filter layer particle which is cleaned and then re-arranged according to the particle size.
Description
Technical Field
The invention belongs to the technical field of combination of various filters, and particularly relates to an automatic backwashing centrifugation-sand and stone integrated filter.
Background
The development of the yellow river water drip irrigation technology for agricultural irrigation becomes one of effective ways for relieving the problem of water resource shortage worldwide, the sand filter is considered to be one of the best choices for primary filtration due to the problems of high concentration, fine particle size and high concentration of microorganisms of cement sand in the yellow river, the filter layer in the existing sand filter is mostly a homogeneous filter material, the blocking substances are mainly accumulated on the upper layer of the filter medium, so that the filter medium cannot fully exert the filtering capacity of the filter layer, the filtering particle size interval is large, but the removal efficiency is low; if the heterogeneous filter material is used as a medium, the removal efficiency can be effectively improved, but the multi-layer particle size discharge sequence cannot be recovered after the backwashing by the conventional backwashing structure.
Meanwhile, the centrifugal filter can be used for separating silt with different particle sizes from yellow river water according to the characteristics of particle size and density, the removal efficiency is high, the particle size separation interval is small, and the effect of treating silt with the particle size of more than 100 microns is good. Therefore, whether the centrifugal filter is combined with a sand filter with a non-homogeneous filter material as a medium or not can be considered, the particle size separation interval of the centrifugal filter and the sand removal efficiency of the sand filter are cooperatively improved, and the automatic backwashing centrifugal-sand integrated filter with the heterogeneous filter material is developed, so that the automatic backwashing centrifugal-sand integrated filter has important significance for the popularization of the water drip irrigation technology of the yellow river.
At present, the yellow river water is filtered mainly by adopting a mode of combining various filters such as sand, centrifugation and lamination, but a plurality of experts and scholars propose an integrated filter for the yellow river water, for example: yang Peiling et al in the invention patent with chinese patent application number ZL201710812507.0 propose a "sand-screen" integrated filter and a combined filter system, the sand filter is arranged on the upper part of the tank, the screen filter is arranged on the lower part of the tank, a separator is arranged between the sand filter and the screen filter, the sand filter and the screen filter are separately washed during back washing without mutual influence, and the back washing effect of the integrated filter is improved. Xinjiang Tianye (group) Limited company has proposed the back flush combination formula filter in the utility model patent of Chinese patent application number ZL200520133926.4, at sandstone filtration ware internally mounted centrifugal filter jar body, its normal filtration gets into in the sandstone filtration ware behind the centrifugal filter, and sandstone filtration ware has back flush structure. However, the homogeneous medium is considered to be adopted in the existing sandstone filter, the backwashing of heterogeneous filter materials of the sandstone filter cannot be realized, the centrifugal filter and the sandstone filter are not considered to be combined, and the synergistic improvement of the separation efficiency and the effective filtering particle size interval is not realized.
Therefore, the invention provides an automatic backwashing centrifugation-sand and stone integrated filter for a yellow river water drip irrigation system, which uses a brand-new centrifugation-sand and stone integrated filter structure configuration and backwashing structure, under a normal filtering working condition, according to a secondary filtering mode of coarse filtering of the centrifugal filter and fine filtering of the sand filter, under a backwashing working condition, the centrifugal filter cleans filter layer particles in the sand filter, changes the operating pressure of the centrifugal filter, realizes that centrifugal separation particle sizes enter the sand filter from small to large to form a filter layer structure, and solves the problem of particle size distribution change after the backwashing of heterogeneous particle sizes is realized.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides an automatic backwashing centrifugal-sand and stone integrated filter, which is characterized by comprising the following components: the sand and stone filter comprises a water inlet three-way electromagnetic valve, a sand and stone filter water inlet pipe, a sand collecting tank sand discharging electromagnetic valve, a sand and stone filter, a centrifugal filter water inlet pipe, a centrifugal filter, a filter material outlet electromagnetic valve, a water discharging hole, a sand and stone filter water discharging pipe, a sand and stone filter water purifying outlet valve, a sand discharging pipe and a sand conveying pipe, wherein the sand and stone filter is arranged in the center, and a plurality of centrifugal filters on the same horizontal plane are uniformly arranged on the outer side of the sand and stone filter; an outlet at the top of the centrifugal filter is connected with the top of the sand filter tank body through a sand conveying pipe; the side wall of the cylindrical part of the centrifugal filter is provided with an additional opening so as to be connected with the lower part of the sand filter tank body through a sand discharge pipe and a filter material outlet electromagnetic valve; a sand filter drain pipe is arranged at the bottom of the sand filter tank body, and a sand filter purified water outlet valve is arranged on the sand filter drain pipe;
the uppermost main water inlet pipe is connected with the sand filter through a water inlet three-way electromagnetic valve and a sand filter water inlet pipe, the other outlet of the water inlet three-way electromagnetic valve is connected with a volute-shaped water delivery pipe which is horizontally arranged, and the inner side of the volute-shaped water delivery pipe is connected with a water inlet of a centrifugal filter through a centrifugal filter water inlet pipe; the volume of the conical sections of all the centrifugal filters is larger than that of the filtering layer of the sand filter;
the sand filter is internally provided with: the hollow rod is rotatably connected and installed in the sandstone filter and is collinear with the axis of the sandstone filter tank body; the upper end of the hollow rod is connected with a water inlet pipe of the sand filter, a plurality of rows of drain holes are formed in the lower portion of the hollow rod along the axis direction, a hollow impeller scraper blade is fixedly connected to the outside of each row of drain holes, and scraper driving water holes are uniformly formed in blades on the same side of each hollow impeller scraper blade.
The total number of the centrifugal filters is 3-12.
The distances between the centrifugal filters and the sand filter are equal.
The annular volute-shaped water delivery pipe is collinear with the axis of the cylindrical tank body of the sand filter; the length and the inclination angle of each centrifugal filter water inlet pipe are equal.
The grain size grading of the filter material in the sand filter is 0.27mm-0.83mm, and the grain size of the filter material is gradually reduced from top to bottom.
Discharging the filter material into the centrifugal filter when the sand filter is in a back washing state, and then returning the filter material to the sand filter from the centrifugal filter; forming a complete filtering layer structure with different grain diameters, wherein the small grain diameter is on the lower grain diameter and the large grain diameter is on the upper grain diameter.
During the process that the filter material returns to the sand filter from the centrifugal filter; the operating pressure of the centrifugal filter decreases with increasing backwash time.
And the lower part of the hollow rod is also provided with a plurality of rows of hollow rod drainage driving holes along the axis direction.
The number of rows of the hollow rod drainage driving holes is equal to that of the hollow impeller scraper blades, and the rows are alternately arranged.
The lower part of the centrifugal filter is connected with the sand collecting tank through a sand discharging electromagnetic valve of the sand collecting tank.
The invention has the beneficial effects that:
1. through the open-close matching of different valves, a secondary filtering mode of fine filtering of the sandstone filter after coarse filtering of the centrifugal filter is established, a centrifugation-sandstone back-flushing operation mode of a heterogeneous filtering layer is established, and the centrifugal filter is used for rearranging the filtering layer according to the particle size after cleaning the filtering layer particles of the sandstone filter.
2. A plurality of centrifugal filters are distributed around the sand filter at equal intervals, so that the separation efficiency of particles in a filter layer is ensured; the volume of all the conical sections of the centrifugal filter and the volume of the filtering layer larger than that of the sand filter are taken as control criteria.
3. A scraper blade structure of a hollow impeller of the sand filter based on hydraulic drive is developed; the sand-stone sieve plate clings to the sand-stone filter from the upper part, and the rotation is carried out under the hydraulic driving condition to discharge the particles in the filtering layer to the centrifugal filter, thereby ensuring the particle size cleaning and the reordering process in the centrifugal filter.
4. A sand filter backwashing structure based on a centrifugal filter is developed; and establishing an operation mode that the operation pressure of the centrifugal filter is gradually reduced along with the increase of time, so that the particle size is greatly returned to the sand filter from the overflow port of the centrifugal filter to form required filter layer arrangement, and the blank of a back washing structure in the heterogeneous sand-gravel filter is filled.
Drawings
FIG. 1 is a schematic diagram of the filter structure of an embodiment of an automatic backwash centrifugal-sand integrated filter according to the present invention;
FIG. 2 is an elevational view of a filter according to an embodiment of the invention;
FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3 in area B;
FIG. 5 is a top view of a filter according to an embodiment of the present invention.
The sand-collecting tank comprises a water inlet three-way electromagnetic valve 1, a sand filter water inlet pipe 2, a sand-collecting tank sand-discharging electromagnetic valve 1,4, a sand filter 5, a hollow rod 6, a centrifugal filter water inlet pipe 7, a centrifugal filter 8, a filter material outlet electromagnetic valve 9, a water discharge hole 10, a sand filter water discharge pipe 11, a sand filter purified water outlet valve 12, a hollow impeller scraper blade 13, a sand discharge pipe 14, a sand separator plate 15, a sand conveying pipe 16, a shell 17, a volute-shaped water conveying pipe 51, a hollow rod water discharge driving hole 123 and a scraper driving water hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the present invention shown in fig. 1 includes: the sand and stone filter comprises a water inlet three-way electromagnetic valve 1, a sand and stone filter water inlet pipe 2, a sand collecting tank sand discharging electromagnetic valve 3, a sand and stone filter 4, a centrifugal filter water inlet pipe 6, a centrifugal filter 7, a filter material outlet electromagnetic valve 8, a water outlet hole 9, a sand and stone filter water outlet pipe 10, a sand and stone filter pure water outlet valve 11, a sand discharging pipe 13 and a sand conveying pipe 15, wherein the sand and stone filter 4 is arranged in the center, a plurality of centrifugal filters 7 which are positioned on the same horizontal plane and have the same distance with the sand and stone filter 4 are arranged on the outer side of the sand and stone filter 4, and the centrifugal filters 7 are uniformly arranged along the circumferential direction of the sand and stone filter 4; the outlet at the top of the centrifugal filter 7 is connected with the top of the tank body of the sand filter 4 through a sand conveying pipe 15; an additional opening is arranged on the side wall of the cylindrical part of the centrifugal filter 7 so as to be connected with the lower part of the tank body of the sand filter 4 through a sand discharge pipe 13 and a filter material outlet electromagnetic valve 8; the lower part of the centrifugal filter 7 is connected with a sand collecting tank (not shown in the figure) through a sand collecting tank sand discharging electromagnetic valve 3; a sand filter drain pipe 10 is arranged at the bottom of the tank body of the sand filter 4, and a sand filter purified water outlet valve 11 is arranged on the sand filter drain pipe 10; in the first stage of the back flushing state, the sand inlet amount of different centrifugal filters needs to be ensured to be equal as much as possible, so that the length and the inclination angle of the sand discharge pipe 13 are equal;
the uppermost main water inlet pipe is connected with a sand filter 4 through a water inlet three-way electromagnetic valve 1 and a sand filter water inlet pipe 2, the other outlet of the water inlet three-way electromagnetic valve 1 is connected with a volute-shaped water delivery pipe 17 which is horizontally arranged, and the inner side of the volute-shaped water delivery pipe is connected with a water inlet of a centrifugal filter 7 through a centrifugal filter water inlet pipe 6; the annular volute-shaped water delivery pipe 17 is collinear with the cylindrical tank body axis of the sand filter 4, the length and the inclination angle of each centrifugal filter water inlet pipe 6 are equal, and the volute-shaped water delivery pipe 17 and the centrifugal filter water inlet pipes 6 ensure that the water inflow of different centrifugal filters 7 is the same; meanwhile, the number of the centrifugal filters 7 is determined by taking the volume of the conical section of the centrifugal filter larger than the volume of the filtering layer of the sand filter as a control criterion.
The background of the application of the embodiment is as follows: the specific application scene is the typical irrigation area at the upstream in the yellow river: the design flow of the inner river irrigation area is 50m 3 H, median silt particle diameter d 50 The sediment concentration of the river reach is 54 mu m, and the sediment concentration of the river reach in the flood season is 2 percent.
In the present embodiment, a casing 16 is further provided to completely enclose all of the centrifugal filter 7 and the sand filter 4;
in the present embodiment, the number of the centrifugal filters 7 is eight; namely, eight centrifugal filters 7 are provided around the sand filter 4. The grain size grading of the filter material in the sand filter 4 is 0.27-0.83mm, and the grain size of the filter material is gradually reduced from top to bottom; the height of the cone of the centrifugal filter 7 is 987mm, the height of the cone section is 543mm, and the cone angle is 20 degrees.
As shown in fig. 2 to 5, the sand filter 4 is provided with: the hollow rod 5, the hollow impeller scraper blade 12, the hollow rod drainage driving hole 51 and the scraper driving water hole 123, wherein the hollow rod 5 is rotatably connected and installed in the sandstone filter 4 and is collinear with the axis of the sandstone filter 4 tank body; the upper end of the hollow rod 5 is connected with the sand filter water inlet pipe 2, the lower part of the hollow rod 5 is provided with a plurality of rows of drain holes 9 and a plurality of rows of hollow rod drainage driving holes 51 along the axial direction, the plurality of rows of drain holes 9 and the plurality of rows of hollow rod drainage driving holes 51 are arranged in a staggered way, a hollow impeller scraper blade 12 is fixedly connected outside each row of drain holes 9, and the same blade of each hollow impeller scraper blade 12 is uniformly provided with scraper driving water holes 123 which can be driven to rotate by water power when water flows out;
in this embodiment, the hollow rod 5 is rotatably connected and installed in the sand filter 4 in the following manner: the upper end of the hollow rod 5 is rotatably connected with a water-blocking flange at the inlet, and the lower end of the hollow rod 5 is rotatably connected with a sand partition plate 14 below the filler.
In the present embodiment, the hollow rod drain driving hole 51 is directed to the rear of the rotation direction to increase the thrust of the liquid flow at the time of starting, and when the hollow rod 5 is pushed to rotate by the water flow which is difficult to pass directly due to the large particle size of the filtering material, a motor may be further installed above the hollow rod 5 to increase the driving force of the rotation of the hollow rod 5.
In the embodiment, the number of the impeller scraper blades 12 is 3, the upper ends of the hollow impeller scraper blades 12 are straight lines parallel to the horizontal plane, and the lower ends of the hollow impeller scraper blades 12 are arc-shaped, so that a smaller contact surface is formed; so that the hollow bar 5 is more easily rotated by the urging of the hollow bar drain driving hole 51 and the blade driving water hole 123 to flow out of the liquid stream.
Under the normal filtration working condition, according to the secondary filtration mode of the coarse filtration of the sand filter after the coarse filtration of the centrifugal filter, under the back washing working condition, the centrifugal filter cleans the particles of the filter layer in the sand filter, and the time of the operation mode that the operation pressure is gradually reduced along with the increase of the time is established. The quartz sand in the sand filter 4 is discharged into the centrifugal filter 7 by back flushing, and the quartz sand returns to the sand filter 4 in batches by the centrifugal filter 7, so that the sand filter is paved again after centrifugal separation with the grain diameter from small to large, an effective filtering layer structure is formed, and the problem of missing of a back flushing structure is solved.
The backwashing centrifugation-sand and stone integrated filter can be mainly divided into two operation modes of normal filtration and backwashing, and the operation process is as follows:
1) And (4) normal filtering state:
under the normal condition, the passageway that water inlet three way solenoid valve 1 and below centrifugal filter inlet tube 6 are connected is opened, rivers are via three way solenoid valve 1, volute form raceway 17 and centrifugal filter inlet tube 6 get into centrifugal filter 7, under centrifugal filter whirl filtering action, large granule silt is arranged husky solenoid valve 3 through the husky jar of collection and gets into the husky jar of collection of below, during finer granule silt gets into sandstone filtration ware 4 through centrifugal filter's export and defeated sand pipe 15, through the further filtering action of inside filtering layer, rivers after the filtration are arranged to the water purification pipe from sandstone filtration ware drain pipe 10.
2) Backwashing state (centrifugal-sand backwashing operation mode of heterogeneous filter layer):
when the pressure difference between the three-way electromagnetic valve 1 and the outlet 10 of the sand filter reaches a preset pressure difference value, the backwashing state is entered, and the backwashing is divided into the following steps:
sand discharge stage, centrifugal filter 7: the sand-discharging electromagnetic valve 3 of the sand collecting tank is opened, the centrifugal filter 7 is closed, meanwhile, the sediment in the sand collecting tank below the centrifugal filter 7 is discharged along with water, a program is set at the position for sand discharging for 5 minutes, and the sand-discharging electromagnetic valve 3 of the sand collecting tank is closed after the sand discharging is finished.
In the first stage, the sand filter 4 discharges filter materials into the centrifugal filter 7: the passage between the three-way electromagnetic valve 1 and the volute-shaped water delivery pipe 17 below is closed, the passage between the three-way electromagnetic valve and the side sandstone filter 4 is opened, the filter material outlet electromagnetic valve 8 is opened, and the purified water outlet valve 11 of the sandstone filter is closed; during rivers directly get into hollow rod 5, discharge to hollow impeller scraper 12 in through the wash port 9 of hollow impeller scraper 12, hollow rod 5 begins to rotate under the promotion of scraper drive water hole 123, drives filter material and water simultaneously rotatory to discharge the filter material to centrifugal filter 7 in, simultaneously, hollow rod drainage drive hole 51 has also been arranged to hollow rod bottom, gives the filter material discharge and adds the motive force.
In the second stage, the filter material returns to the sand filter 4 through the centrifugal filter 7: after the filter materials enter the centrifugal filter 7, the filter material outlet electromagnetic valve 8 is closed, the sand filter purified water outlet valve 11 is opened, the channel between the three-way electromagnetic valve 1 and the centrifugal filter water inlet pipe 6 is opened, and the channel between the three-way electromagnetic valve 1 and the sand filter 4 is closed; the centrifugal filter 7 starts to work, the flow and the pressure at the inlet of the centrifugal filter are controlled by PLC programming, the working pressure of the centrifugal filter is reduced along with the increase of the backwashing time, the particles with small particle size firstly enter the sand filter 4 along with the water flow under the action of the rotational flow in the centrifugal filter 7, and the particles with larger particle size enter the sand filter 4 along with the reduction of the pressure, so that a complete filter layer structure with different particle sizes, wherein the small particle size is larger than the large particle size.
In this embodiment, the preset differential pressure value is a pressure difference up to 10m head loss.
In the process of discharging the filter material to the centrifugal filter 7 in the first stage, the small-size filter material below the sandstone filter 4 flows out along with the water flow discharged from the hollow rod water discharge driving hole 51 and the scraper driving water hole 123 and drives the residual material to start moving; on the premise that the moving speed of part of the filter material is increased firstly, the empty impeller scraper blade 12 gradually starts to rotate along with the decrease of the filter material and drives the rest filter material to rotate together; then the hollow rod 5 rotates and the water flow pushes the filter material to be discharged into the centrifugal filter 7 gradually.
Claims (7)
1. An automatic backwashing centrifugal-sand integrated filter, comprising: the sand filter comprises a water inlet three-way electromagnetic valve (1), a sand filter water inlet pipe (2), a sand collecting tank sand discharging electromagnetic valve (3), a sand filter (4), a centrifugal filter water inlet pipe (6), a centrifugal filter (7), a filter material outlet electromagnetic valve (8), a water discharging hole (9), a sand filter water discharging pipe (10), a sand filter water purifying outlet valve (11), a sand discharging pipe (13) and a sand conveying pipe (15), wherein the sand filter (4) is arranged in the center, and a plurality of centrifugal filters (7) are uniformly arranged on the outer side of the sand filter (4); the outlet at the top of the centrifugal filter (7) is connected with the top of the tank body of the sand filter (4) through a sand conveying pipe (15); an additional opening is arranged on the side wall of the cylindrical part of the centrifugal filter (7) so as to be connected with the lower part of the tank body of the sandstone filter (4) through a sand discharge pipe (13) and a filter material outlet electromagnetic valve (8); a sandstone filter drain pipe (10) is arranged at the bottom of the tank body of the sandstone filter (4), and a sandstone filter purified water outlet valve (11) is arranged on the sandstone filter drain pipe (10);
the uppermost main water inlet pipe is connected with a sand filter (4) through a water inlet three-way electromagnetic valve (1) and a sand filter water inlet pipe (2), the other outlet of the water inlet three-way electromagnetic valve (1) is connected with a volute-shaped water delivery pipe (17) which is horizontally arranged, and the inner side of the volute-shaped water delivery pipe is connected with a water inlet of a centrifugal filter (7) through a centrifugal filter water inlet pipe (6); the volume of the conical sections of all the centrifugal filters (7) is larger than the volume of the filtering layer of the sand filter;
the sand filter (4) is internally provided with: the scraper assembly comprises a hollow rod (5), a hollow impeller scraper blade (12) and a scraper driving water hole (123), wherein the hollow rod (5) is rotatably connected and installed in the sandstone filter (4) and is collinear with the axis of the sandstone filter (4) tank body; the upper end of the hollow rod (5) is connected with the sand filter water inlet pipe (2), a plurality of rows of water drainage holes (9) are formed in the lower portion of the hollow rod (5) along the axis direction, a hollow impeller scraper blade (12) is fixedly connected to the outside of each row of water drainage holes (9), and scraper driving water holes (123) are uniformly formed in blades on the same side of each hollow impeller scraper blade (12);
the grain size grading of the filter material in the sand filter (4) is 0.27mm-0.83mm, and the grain size of the filter material is gradually reduced from top to bottom; the sand filter (4) discharges filter materials into the centrifugal filter (7) in a back flushing state; then the filter material is returned to the sand filter (4) by the centrifugal filter (7); forming a complete filtering layer structure with different particle sizes, wherein the small particle size is on the lower particle size and the large particle size is on the upper particle size; during the process of returning the filter material from the centrifugal filter (7) to the sandstone filter (4), the working pressure of the centrifugal filter (7) is reduced along with the increase of the back flushing time.
2. An automatic back-flushing centrifugal-sand-stone integrated filter as claimed in claim 1, characterized in that the total number of said centrifugal filters (7) is 3-12.
3. An automatic backwash centrifugal-sand integrated filter as claimed in claim 2, characterized in that each centrifugal filter (7) is equidistant from the sand filter (4).
4. An automatic back-flushing centrifugal-sand and stone integrated filter as claimed in claim 1, characterized in that the annular volute-shaped water delivery pipe (17) is collinear with the cylindrical tank axis of the sand filter (4); the length and the inclination angle of each centrifugal filter water inlet pipe (6) are equal.
5. An automatic backwashing centrifugal-sand and stone integrated filter as claimed in claim 1, wherein the lower part of said hollow rod (5) is further provided with a plurality of rows of hollow rod drain driving holes (51) along the axial direction.
6. An automatic backwash centrifugal-sand integrated filter as claimed in claim 5, wherein the number of rows of hollow rod drain drive holes (51) is equal to the number of rows of hollow impeller blades (12) and the rows are arranged alternately.
7. An automatic back-flushing centrifugal-sand integrated filter as claimed in claim 1, characterized in that the lower part of the centrifugal filter (7) is connected with a sand collecting tank through a sand collecting tank sand discharging electromagnetic valve (3).
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| CN202111671717.5A CN114307363B (en) | 2021-12-31 | 2021-12-31 | Automatic back flush centrifugation-grit integral filter |
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| CN103520966A (en) * | 2013-09-27 | 2014-01-22 | 新龙鼎控股集团有限公司 | Automatic vortex-type filtering device |
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| US6383383B1 (en) * | 2001-06-21 | 2002-05-07 | Water Creations, Inc. | Combination cyclonic separator and multi-stage filter and pump |
| KR100559739B1 (en) * | 2005-08-10 | 2006-03-15 | 경상남도 창원시 | Purification apparatus for lake |
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| CN201978554U (en) * | 2010-11-04 | 2011-09-21 | 美舒环保科技（北京）有限公司 | Compressed air-driven honeycombed continuous filtration pool |
| CN102512870B (en) * | 2012-01-05 | 2013-10-30 | 中国农业大学 | Automatic back-washing combined filter |
| JP6373711B2 (en) * | 2014-10-03 | 2018-08-15 | 富士フィルター工業株式会社 | Filtration device |
| CN104324535B (en) * | 2014-11-04 | 2016-01-13 | 青岛国标环保有限公司 | There is filter plant and filter method, the back-washing method of eddy flow backwash function |
| CN212067852U (en) * | 2020-03-10 | 2020-12-04 | 太原市鑫运泽科技有限公司 | Continuous backwashing sand filter |
| CN112386988B (en) * | 2020-11-17 | 2022-08-05 | 华东理工大学 | Device and method for cleaning filter medium through bubble water circulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103520966A (en) * | 2013-09-27 | 2014-01-22 | 新龙鼎控股集团有限公司 | Automatic vortex-type filtering device |
| CN204411880U (en) * | 2015-01-27 | 2015-06-24 | 刘新杰 | A kind of filter for agricultural irrigation systems |
| CN208465270U (en) * | 2018-03-16 | 2019-02-05 | 延长油田股份有限公司 | A kind of filter with multi-layer filter material with back purge system |
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