CN102372359A - Independent filter head for stable-pressure water distribution and gas distribution of air cushion layer and application method thereof - Google Patents
Independent filter head for stable-pressure water distribution and gas distribution of air cushion layer and application method thereof Download PDFInfo
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- CN102372359A CN102372359A CN2011103099617A CN201110309961A CN102372359A CN 102372359 A CN102372359 A CN 102372359A CN 2011103099617 A CN2011103099617 A CN 2011103099617A CN 201110309961 A CN201110309961 A CN 201110309961A CN 102372359 A CN102372359 A CN 102372359A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses an independent filter head for stable-pressure water distribution and gas distribution of an air cushion layer and an application method thereof. The filter head comprises a filter head cap, a filter head cap bottom plate, a filter head rod, a filter screen and a pre-embedded pipe sleeve, wherein the filter head cap is of a circular arch; the top of the filter head cap is provided with a residual gas releasing hole, the waist is provided with an upper gas distribution hole and a lower gas distribution hole, and the bottom plate is provided with a water distribution hole; the upper part of the filter head rod is provided with filter head rod installation screw thread, a filter head rod water distribution pipe is arranged in the filter head rod, a filter head rod gas distribution pipe is adhered on the inner pipe wall at one side of the filter head rod water distribution pipe, the length of the lower part of the filter head rod water distribution pipe is larger than that of the gas distribution pipe, the middle part of the filter head rod gas distribution pipe is provided with a filter head rod residual gas releasing hole, and the pipe wall at the outer side of the lower part of the filter head rod gas distribution pipe is provided with a vertical gas inlet seam; and the filter screen of the filter head can be assembled at the bottom of the water distribution pipe, the filter head pre-embedded pipe sleeve is of a pipe clamp shape, and the lower part of the filter head pre-embedded pipe sleeve is of a bell mouth shape. The filter head disclosed by the invention integrates aeration, water filtration and back washing functions, thereby simplifying the structure of a filter pool, ensuring work quality and improving efficiency. The filter head disclosed by the invention can be widely applied to a sewage biological filter pool treatment system and gas-water backwashing filter pools in water supply and other industries.
Description
Technical field
The present invention relates to a kind of distribute water and air device of water treating equipment.
Background technology
The comparatively advanced BAF of operation at present generally adopts V-type filter tank structure, and aerating system and back flushing distribution are divided into two independently systems.Aerating system is installed pipe special and aeration head, and the blending rinsed gas distribution of the gas flushing of back flushing and air water then adopts filter, filter plate.
1, the filtration of V-type BAF, aeration system
Former water evenly flows into the filter tank through the water distributing pore of irrigation channel, utilizes the water action of gravity, and filter material layer is passed in infiltration, through being installed in space and the filter bar of opening on the filter on the filter plate, flows into the water collecting basin of bottom, filter tank, flows out through filtering the back outlet conduit.
In drainage, pressurized air gets into the aeration arm be installed in the filter top and through being installed in aeration head on the arm with the state of the small bubbles filter material layer through top through the aeration air-supply duct, for the mushroom of filter tank oxidation degradation work provides oxygen.
2, the backwash technique of V-type BAF
Continuity along with the filter time; Space in the filtering layer is stopped up by the biosolids of the new growth of mushroom formation and the suspended substance in the former water gradually; Filter tank filtering velocity fall head of water loss increases; For guaranteeing that the filter tank can works better, when head loss acquires a certain degree, need carry out back flushing to the filter tank.
During filter back washing, close the aerated conduit valve earlier and stop aeration, close water flashboard into simultaneously and let the former water that gets in the pond continue to filter, treat to close when pool inner water potential drop to V-type sk-top once water outlet valve after the filter.Blower fan, recoil pump and the corresponding backwash gas of switch, residual air release and backwashing water by-pass valve control mix flushing by gas flushing, air water and water 3 stages of flushing recoil to the filter tank through starting then.When air water mixes flushing with the water flushing, open the dirt discharge that water discharge valve will recoil and gather in water and the filter tank.
Carry out that gas flushing is gentle, when water mixes flushing; Water collecting basin top filter plate forms an air cushion layer voltage stabilizing down; Pressurized air after the voltage stabilizing is through the slit exhaust of filter cap top; With the state of the small bubbles filter material layer through top filter material layer is expanded, effectively remove suspended substance and the microbial film that comes off through the collision of filtering material particle.
In the traditional method, aeration head and filter, inlet pipe and back flushing tracheae independently are provided with has not only increased construction investment but also increased difficulty of construction.In addition, in aeration system, aeration head (aeration perforated pipe or aerator) does not directly have the voltage stabilizing facility can influence the aeration quality by the aerated conduit air feed.Simultaneously, because traditional BAF only forms an air cushion layer in the filter plate bottom when back flushing, the stable inadequately backwash effect that also can influence the filter tank of filter tank air pressure when gas, air-water backwashing.
Summary of the invention
The purpose of this invention is to provide a kind of air cushion layer voltage stabilizing water distribution, gas distribution independence filter and application method thereof, solve and simplify the filter tank structure, guarantee aeration, back flushing quality, the problem of increasing work efficiency.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of air cushion layer voltage stabilizing water distribution, gas distribution independence filter comprise filter cap, filter cap base plate, filter bar, filtering net and pre-buried pipe box;
Said filter cap dome-shaped, its top have filter cap residual air release aperture, and its waist has qi-emitting hole and following qi-emitting hole;
Have water distributing pore on the said filter cap base plate;
Said filter bar top is provided with the filter bar screw thread is installed, and is provided with filter bar water distributor in the bar; Filter bar gas distribution pipe is attached on the inside pipe wall of filter bar water distributor one side, and filter bar water distributor lower length is greater than filter bar gas distribution pipe, and filter bar gas distribution pipe middle part has filter bar residual air release aperture, has vertical gas distribution pipe air inlet seam on the tube wall of the outside, bottom;
Said filter filtering net can be installed at the bottom of the pipe of water distributor;
Said filter service sleeve is the pipe collar shape, and the bottom is down bell mouth shape, in the same modulus of screw thread on screw thread and the filter bar is arranged.
The waist of said filter cap has a circle to go up qi-emitting hole under a qi-emitting hole and the circle.
On said filter bar water distributor upper end and the filter cap base plate make even in the plane, and filter bar gas distribution pipe upper end is higher than qi-emitting hole on the filter cap.
The inwall first half of said pre-buried pipe box has screw thread, and the outer wall of pre-buried pipe box has flange.
A kind of biological filter of using said air cushion layer voltage stabilizing water distribution, gas distribution independence filter; Said air cushion layer voltage stabilizing water distribution, gas distribution independence filter are installed on the filter plate in filter tank; Have one to cross water space between filter cap base plate lower plane and the filter plate; Pre-buried pipe box in filter club head below filter bar is installed screw thread and is embedded in filter plate forms adjustable and is connected fixing; Filter bar residual air release aperture is positioned at the hydraucone of service sleeve, and a side filter tank wall of catchment area, filter plate bottom, filter tank is communicated with back flushing water inlet pipe, filter back rising pipe and aeration rate valve, backwash gas control valve outlet conduit.
The application method of said air cushion layer voltage stabilizing water distribution, gas distribution independence filter, step is following:
Aeration, filtration operating mode: the pressurized air that gets into the catchment area forms the filter tank air cushion layer at its top; Increase when the gas distribution pipe air inlet of the below that reaches filter bar gas distribution pipe is stitched along with the increase air cushion layer thickness of tolerance is continuous; Pressurized air gets into the top of filter cap through the port of gas distribution pipe air inlet seam, filter bar gas distribution pipe; Form second air cushion layer-filter cap air cushion layer on the top of filter cap, along with the thickness of the increase filter cap air cushion layer of tolerance constantly increases, when reaching qi-emitting hole when following; Pressurized air flows out through last qi-emitting hole and forms aeration gas flow; Getting into filter material layer with aeration bubble state is that the mushroom of filter tank oxidation degradation work provides oxygen, simultaneously, filter the filter that the back forms through filter material layer after current get into the filter cap through the water distributing pore on the filter cap base plate; Filter bar water distributor on the filter bar flows into the catchment area, filter tank then, and rising pipe flows out after filter;
Back flushing operating mode: gas flushing stage; Pressurized air air-supply duct, backwash gas control valve get into the catchment area of bottom, filter tank; And form the filter tank air cushion layer at the top, catchment area, after air cushion layer reaches certain thickness, get into filter, and on its filter cap, form filter cap air cushion layer through the seam of the gas distribution pipe air inlet on the filter bar; When qi-emitting hole is following under the thickness of filter cap air cushion layer reaches; From last qi-emitting hole, flow out the qi-emitting hole down, form back flushing back flushing air-flow with, all with the filter material layer in backwash gas blister attitude entering filter tank to reach the purpose of gas flushing filtrate; Because the 3-4 that the tolerance during filter back washing is about aeration rate doubly, so thick many of the air cushion layer that the filter tank air cushion layer of formation and filter cap air cushion layer form during all than aeration;
Gas, water mix rinse stage; The gentle rinse stage of the working condition of backwash gas is identical; At this moment, backwashing water gets into water collecting basin through the back flushing pipeline, under the hydraulic pressure effect, gets into the filter cap through filter bar water distributor; Flow out through the water distributing pore on the filter cap base plate, pass filter material layer and form the back flushing current;
The water rinse stage, the backwash gas control valve is closed, and the residual air of top, catchment area air cushion layer and filter bar, filter cap internal memory can discharge through filter bar residual air release aperture and filter cap residual air release aperture; To avoid forming vapour lock; At this moment, will all be full of water in catchment area and the filter, when backwashing water after the back flushing pipeline gets into water collecting basin; Under the hydraulic pressure effect, get into the filter cap through filter bar water distributor, filter bar gas distribution pipe; Flow out formation back flushing current through the water distributing pore on the filter cap base plate, flow into the back flushing discharge channel through filter material layer, the last qi-emitting hole during the water flushing on the filter cap, following qi-emitting hole and filter cap residual air release aperture also have a spot of back flushing current and flow out; Because its aperture is very little, discharge is also very little.
Compared with prior art the present invention has following characteristics and beneficial effect:
The present invention adopts upper and lower two venting holes, upper air-vent in the filter tank aeration, use as solarization air cap when filtering operating mode, during, water mix backwash gentle at gas again double as recoil pore use.Following venting hole is only gentle at gas, make the recoil pore during water mix backwash uses.The top of filter cap can generate a voltage stabilizing air cushion layer that changes thickness according to air input size guaranteeing the stable of aeration and back flushing air pressure, thereby assurance aeration rate and back flushing tolerance is constant.
Filter bar of the present invention has adopted the work alone design of mode of water distribution, distribution, has effectively avoided in the filter bar, producing in the filter working process generation of vapour lock, pulse situation.Simultaneously, the filter bar has adopted the adjustable structure of mounting height, thereby highly can make the highly consistent equilibrium that can guarantee each filter aeration rate, recoil tolerance and the back flushing water yield of all filter air inlets in the filter tank through adjustment.
Because novel filter adopts above-mentioned multiple particular design; Solved thoroughly that former biological filter aeration head and filter, inlet pipe and back flushing tracheae need that problem independently is set and in aeration system, aeration head, aeration perforated pipe or aerator all are directly not have the voltage stabilizing facility can influence the aeration quality by the aerated conduit air feed; And traditional BAF stable inadequately defective of air pressure when when back flushing, only forming an air cushion layer and also can cause the filter tank at gas, air water mix backwash in filter plate bottom.
The present invention integrates aeration, drainage and backwashing function; Can guarantee that aeration, back flushing air pressure are stable; Improve workmanship and working efficiency, be widely used in saprobiont filter tank treatment system, also can be applied in the air-water backwash filter of water supply and other industry.
Description of drawings
Below in conjunction with accompanying drawing the present invention is done further detailed explanation.
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a scheme of installation of the present invention.
Fig. 3 is a using integral synoptic diagram of the present invention.
Fig. 4 is an application partial schematic diagram of the present invention.
Fig. 5 is filtration of the present invention, aeration operating mode synoptic diagram.
Fig. 6 is filtration of the present invention, aeration operating mode principle schematic.
Fig. 7 is a back flushing operating mode synoptic diagram of the present invention.
Fig. 8 is a back flushing operating mode principle schematic of the present invention.
Fig. 9 is the structural representation of service sleeve.
Reference numeral: 1-filter; 1.1-filter cap; 1.2-filter cap residual air release aperture; 1.3-last qi-emitting hole; 1.4-following qi-emitting hole; 1.5-filter cap base plate; 1.6-water distributing pore; 1.7-filter bar; 1.8-the filter bar is installed screw thread; 1.9-filter bar water distributor; 1.10-filter bar gas distribution pipe; 1.11-filter bar residual air release aperture; 1.12-gas distribution pipe air inlet seam; 1.13-filtering net; 1.14-service sleeve; The 2-filter plate; The 3-filter material layer; 4-water inlet cloth tank; 5-back flushing discharge channel; The 6-catchment area; 7-back flushing water shoot; 8-back flushing water inlet pipe; 9-filter back rising pipe; The 10-air-supply duct; 11-aeration rate valve; 12-backwash gas control valve; 13-aeration bubble; 14-filter tank wall; 15-back flushing bubble; 16-filter cap air cushion layer; 17-filter tank air cushion layer; The 18-aeration gas flow; 19-back flushing air-flow 1; 20-back flushing air-flow 2; 21-filter back current; 22-back flushing current.
Embodiment
Embodiment is referring to shown in Figure 1, and a kind of air cushion layer voltage stabilizing water distribution, gas distribution independence filter 1 comprise filter cap 1.1, filter cap base plate 1.5, filter bar 1.7, filtering net 1.13 and pre-buried pipe box 1.14; Said filter cap 1.1 dome-shaped, its top have filter cap residual air release aperture 1.2, and its waist has qi-emitting hole 1.3 and following qi-emitting hole 1.4; Have water distributing pore 1.6 on the said filter cap base plate 1.5.Said filter bar 1.7 tops are provided with the filter bar screw thread 1.8 are installed, and are provided with filter bar water distributor 1.9 in the bar, and filter bar gas distribution pipe 1.10 is attached on the inside pipe wall of filter bar water distributor 1.9 1 sides, and filter bar water distributor 1.9 lower length are greater than filter bar gas distribution pipe; Filter bar gas distribution pipe middle part has filter bar residual air release aperture 1.11, has vertical gas distribution pipe air inlet seam 1.12 on the tube wall of the outside, bottom; Said filter filtering net 1.13 can be installed at the bottom of the pipe of water distributor; Said filter service sleeve 1.14 is the pipe collar shape, and the bottom is down bell mouth shape, in the same modulus of screw thread on screw thread and the filter bar is arranged.The waist of above-mentioned filter cap has a circle to go up qi-emitting hole 1.4 under a qi-emitting hole 1.3 and the circle; On said filter bar water distributor 1.9 upper ends and the filter cap base plate 1.5 make even in the plane, and filter bar gas distribution pipe 1.10 upper ends are higher than qi-emitting hole 1.3 on the filter cap.
Referring to shown in Figure 2, said air cushion layer voltage stabilizing water distribution, gas distribution independence filter 1 are installed on the filter plate 2 in filter tank, have one to cross water space between filter cap base plate 1.5 lower planes and the filter plate 2, guarantee the water distributing pore works better.Screw thread 1.8 is installed to the filter bar when filter is installed and is screwed into the screw thread in the pre-buried cover sleeve pipe 1.14; Pre-buried pipe boxes 1.14 in filter club head below is installed screw thread 1.8 and is embedded in filter plate 2 form adjustable and are connected and fix, and filter bar residual air release aperture 1.11 is positioned at the hydraucone of service sleeve 1.14.
Referring to Fig. 3, shown in Figure 4; Top, filter tank distribution two row's water inlet cloth tanks 4; One side filter tank wall 14 of catchment area, filter plate bottom, filter tank 6 and back flushing water inlet pipe 8, filter back rising pipe 9, and the outlet conduit of aeration rate valve 11, backwash gas control valve 12 is communicated with.
Referring to Fig. 9, the inwall first half of pre-buried pipe box 1.14 has screw thread, and the outer wall of pre-buried pipe box 1.14 has three circle flanges, in order to be connected firmly with filter plate.
Said filter bar residual air release aperture 1.11 can guarantee that air cushion layer 17 residual air in filter tank can discharge totally in the telescopic hydraucone.
The application method of a kind of said air cushion layer voltage stabilizing water distribution, gas distribution independence filter, step is following:
Aeration, filter operating mode, referring to Fig. 5, shown in Figure 6:
The pressurized air that gets into the catchment area forms filter tank air cushion layer 17 at its top; Increase when the air inlet of the below that reaches filter bar gas distribution pipe 1.10 stitches 1.12 along with the increase air cushion layer thickness of tolerance is continuous; Pressurized air gets into the top of filter filter cap 1.1 through the port of air inlet seam, gas distribution pipe; Form second air cushion layer-filter cap air cushion layer 16 on filter cap top; Along with the increase air cushion layer thickness of tolerance constantly increases when reaching qi-emitting hole 1.3 when following, pressurized air is through last qi-emitting hole outflow formation aeration gas flow 18, is that the mushroom of filter tank oxidation degradation work provides oxygen with aeration bubble 13 states entering filter material layer.Simultaneously, filter the filter that the back forms through filter material layer after current 21 get into filter caps 1.1 through the water distributing pore on the filter cap base plate 1.6, catchment area, the 1.9 inflow filter tank of the water distributor on the filter bar 6 then, rising pipe 9 outflows after filter.
The back flushing operating mode, referring to Fig. 7, shown in Figure 8:
The gas flushing stage; The catchment area 6 of pressurized air air-supply duct 10, bottom, backwash gas control valve 12 entering filter tank; And form filter tank air cushion layer 17 at the top, catchment area, after air cushion layer reaches certain thickness, get into filters, and on its filter cap, form filter cap air cushion layer 16 through the seam of the gas distribution pipe air inlet on the filter bar 1.12; When gas distribution is following under the thickness of this air cushion layer reaches; From filter cap qi-emitting hole 1.3,1.4, flow out, form back flushing back flushing air- flow 19 and 20, all with the filter material layer 3 in back flushing bubble 15 states entering filter tank to reach the purpose of gas flushing filtrate.Need to prove at this, because the 3-4 that the tolerance during filter back washing is about aeration rate doubly, so thick many of the air cushion layer that filter tank air cushion layer 17 that forms and filter cap air cushion layer 16 form during all than aeration.
Gas, water mix rinse stage, and the gentle rinse stage of the working condition of backwash gas is identical.At this moment, backwashing water gets into water collecting basin 6 through the back flushing pipeline, under the hydraulic pressure effect, gets into the filter cap through filter bar water distributor 1.9, flows out through the water distributing pore on the filter cap base plate 1.6, passes filter material layer 3 and forms back flushing current 22.
The water rinse stage; The backwash gas control valve is closed, and the residual air of top, catchment area air cushion layer and filter bar, filter cap internal memory can discharge through filter bar residual air release aperture 1.11 and filter cap residual air release aperture 1.2, to avoid forming vapour lock; At this moment; To all be full of water in catchment area and the filter, when backwashing water after the back flushing pipeline gets into water collecting basin, under the hydraulic pressure effect, get into the filter cap and flow out formation back flushing current 22 through the water distributing pore on the filter cap base plate through the water distribution in the filter bar, gas distribution pipe; Flow into back flushing discharge channel 5 through filter material layer through back flushing water shoot 7; Two venting holes during the water flushing on the filter cap and residual air release aperture also have a spot of back flushing current and flow out, because its aperture is very little, discharge is also very little.
Claims (6)
1. an air cushion layer voltage stabilizing water distribution, gas distribution independence filter (1) comprise filter cap (1.1), filter cap base plate (1.5), filter bar (1.7), filtering net (1.13) and pre-buried pipe box (1.14);
Said filter cap (1.1) dome-shaped, filter cap residual air release aperture (1.2) is arranged at its top, and its waist has qi-emitting hole (1.3) and following qi-emitting hole (1.4);
Have water distributing pore (1.6) on the said filter cap base plate (1.5);
Said filter bar (1.7) top is provided with the filter bar screw thread (1.8) is installed, and is provided with filter bar water distributor (1.9) in the bar; Filter bar gas distribution pipe (1.10) is attached on the inside pipe wall of filter bar water distributor (1.9) one sides; Filter bar water distributor (1.9) lower length is greater than filter bar gas distribution pipe (1.10); Filter bar gas distribution pipe (1.10) middle part has filter bar residual air release aperture (1.11), has vertical gas distribution pipe air inlet seam (1.12) on the tube wall of the outside, bottom;
Said filter filtering net (1.13) can be installed at the bottom of the pipe of water distributor;
Said filter service sleeve (1.14) is the pipe collar shape, and the bottom is down bell mouth shape, in the same modulus of screw thread on screw thread and the filter bar is arranged.
2. air cushion layer voltage stabilizing water distribution according to claim 1, gas distribution independence filter is characterized in that: the waist of said filter cap has a circle to go up qi-emitting hole (1.4) under a qi-emitting hole (1.3) and the circle.
3. air cushion layer voltage stabilizing water distribution according to claim 1, gas distribution independence filter; It is characterized in that: said filter bar water distributor (1.9) upper end is gone up the plane with filter cap base plate (1.5) and is made even, and filter bar gas distribution pipe (1.10) upper end is higher than qi-emitting hole on the filter cap (1.3).
4. air cushion layer voltage stabilizing water distribution according to claim 1, gas distribution independence filter is characterized in that: the inwall first half of said pre-buried pipe box (1.14) has screw thread, and the outer wall of pre-buried pipe box (1.14) has flange.
5. an application rights requires the biological filter of one of 1-5 said air cushion layer voltage stabilizing water distribution, gas distribution independence filter; It is characterized in that: said air cushion layer voltage stabilizing water distribution, gas distribution independence filter (1) are installed on the filter plate (2) in filter tank; Have one to cross water space between filter cap base plate (1.5) lower plane and the filter plate (2); Pre-buried pipe box (1.14) in filter club head below filter bar is installed screw thread (1.8) and is embedded in filter plate (2) forms adjustable and is connected fixing; Filter bar residual air release aperture (1.11) is positioned at the hydraucone of service sleeve (1.14), and a side filter tank wall (14) of catchment area, filter plate bottom, filter tank (6) is communicated with back flushing water inlet pipe (8), filter back rising pipe (9) and aeration rate valve (11), backwash gas control valve (12) outlet conduit.
6. the application method of the said air cushion layer voltage stabilizing of one of claim 1-5 water distribution, gas distribution independence filter, it is characterized in that: step is following:
Aeration, filtration operating mode: the pressurized air that gets into the catchment area forms filter tank air cushion layer (17) at its top; Increase when (1.12) are stitched in the gas distribution pipe air inlet of the below that reaches filter bar gas distribution pipe (1.10) along with the increase air cushion layer thickness of tolerance is continuous; Pressurized air gets into the top of filter cap (1.1) through the port of gas distribution pipe air inlet seam (1.12), filter bar gas distribution pipe (1.10); Second air cushion layer-filter cap air cushion layer (16) formed at the top at filter cap (1.1); Along with the thickness of the increase filter cap air cushion layer (16) of tolerance constantly increases; When reaching qi-emitting hole (1.3) when following, pressurized air flows out through last qi-emitting hole and forms aeration gas flow (18), and getting into filter material layer (3) with aeration bubble (13) state is that the mushroom of filter tank oxidation degradation work provides oxygen; Simultaneously; Current (21) get into filter cap (1.1) through the water distributing pore (1.6) on the filter cap base plate after filtering the filter that the back forms through filter material layer, and the filter bar water distributor (1.9) on the filter bar flows into catchment area, filter tank (6) then, rising pipe (9) outflow after filter;
Back flushing operating mode: gas flushing stage; Pressurized air air-supply duct (10), backwash gas control valve (12) get into the catchment area (6) of bottom, filter tank; And form filter tank air cushion layer (17) at the top, catchment area;, air cushion layer gets into filter after reaching certain thickness through the seam of the gas distribution pipe air inlet on the filter bar (1.12); And go up to form filter cap air cushion layer (16) at its filter cap (1.1), when the thickness of filter cap air cushion layer (16) reaches that qi-emitting hole (4) is following down, from last qi-emitting hole (1.3), outflow the qi-emitting hole (1.4) down; Form back flushing back flushing air-flow (19) and (20); The filter material layer (3) that all gets into the filter tank with back flushing bubble (15) state to be reaching the purpose of gas flushing filtrate, because the 3-4 that the tolerance during filter back washing is about aeration rate doubly, so thick many of the air cushion layer that the filter tank air cushion layer (17) of formation and filter cap air cushion layer (16) form during all than aeration;
Gas, water mix rinse stage; The gentle rinse stage of the working condition of backwash gas is identical; At this moment, backwashing water gets into water collecting basin (6) through the back flushing pipeline, under the hydraulic pressure effect, gets into filter cap (1.1) through filter bar water distributor (1.9); Flow out through the water distributing pore (1.6) on the filter cap base plate (1.5), pass filter material layer (3) and form back flushing current (22);
The water rinse stage; The backwash gas control valve is closed; The residual air of top, catchment area air cushion layer and filter bar, filter cap internal memory can discharge through filter bar residual air release aperture (1.11) and filter cap residual air release aperture (1.2), to avoid forming vapour lock, at this moment; To all be full of water in catchment area and the filter; When backwashing water after the back flushing pipeline gets into water collecting basin, under the hydraulic pressure effect, get into filter cap (1.1) through filter bar water distributor (1.9), filter bar gas distribution pipe (1.10), flow out formation back flushing current (22) through the water distributing pore (1.6) on the filter cap base plate (1.5); Flow into back flushing discharge channel (5) through filter material layer; Last qi-emitting hole (1.3) during the water flushing on the filter cap, following qi-emitting hole (1.4) and filter cap residual air release aperture (1.2) also have a spot of back flushing current (22) and flow out, because its aperture is very little, discharge is also very little.
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| CN2011103099617A CN102372359B (en) | 2011-10-13 | 2011-10-13 | Independent filter head for stable-pressure water distribution and gas distribution of air cushion layer and application method thereof |
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| CN112824329A (en) * | 2019-11-20 | 2021-05-21 | 南京大学 | Water and gas distribution device for modular filter tank and system and application method thereof |
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