CN2843575Y

CN2843575Y - Back-flushing blow-down device of radial-flow filter net and filter material for filter

Info

Publication number: CN2843575Y
Application number: CN 200420068192
Authority: CN
Inventors: 王克春; 蔡友梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-20
Filing date: 2004-07-20
Publication date: 2006-12-06
Anticipated expiration: 2014-07-20

Abstract

The utility model relates to a back-flushing blow-down device of a radial-flow filter net and radial-flow filter materials for a filter. The utility model is characterized in that the utility model adopts a cylindrical sieve pipe formed by trapezoidal stainless steel wires are welded as a water inlet filter net of the center of the filter and a water collecting filter net of the periphery of the filter, the filter materials are outwards narrow and inwards wide due to the trapezoidal wires, the filter materials can be blocked in a gap, and the surface of the sieve pipe is smooth, the filter materials are conveniently formed a fluidization state on the surface of the sieve pipe to eliminate the possibility that filter materials generate plate connection, a cone bucket of the bottom of the filter is provided with a water jet nozzle, a center pipe and a separating cavity are respectively arranged on the jet nozzle, and the center pipe, the separating cavity, a top cone bucket, a slag overflowing opening and a liquid level control valve form the back-flushing blow-down device of the filter materials. A small flow pump supplies water to make the middle part filter materials of which the sewage cutting quantity is maximum constantly brought to the separating cavity of the upper part of the utility model by the center pipe, the filter materials are decelerated to drop to return a filter layer, ordure which is separated rises in a floating mode to the top of a cone bucket of the separating cavity and the ordure and small amount of ordure which rises in a floating mode at the top cone bucket of the filter material layer of the filter are discharged from the slag overflowing opening by that the liquid level control valve raises a liquid level. The back-flushing filter which implements the design can be normally used in production. The utility model can generate an obvious environment to the purifying project of water quality.

Description

Radial-flow strainer screen and filtrate backwash blowdown apparatus

One, technical field

The utility model relates to the filter screen and the filtrate backwash blowdown apparatus of a kind of radial-flow filter in the purification of water quality engineering.

Two, background technology

Filter is the dirty equipment that cuts of purification of water quality treatment process, extensively adopts down to flow depth layer filter at present.Because of filtrate backwash blowdown drift diameter area has only 1/100～1/200 of filter area, to making blowdown not smooth, filtrate purifies not thorough, and 1 year at most several months at least, filtrate inefficacys of can hardening must be upgraded its full scale clearance, could continue use.Add that the filtrate backwash needs to shut down, troublesome poeration not only, filth-discharging effect also can't be monitored; Stop using even scrap because of above-mentioned reason causes a considerable amount of existing filters.The radial-flow filter by comparison; filtered water stream from top-down axially at the uniform velocity flow change into from the radially speed change of mind-set periphery diffusion flow; flow velocity is successively decreased by middle mind-set periphery; not only can strengthen filtering layer and cut dirty effect; also can change filtrate and clean mode; change local automatic back-washing continuously into by the backwash of regular shutdown gross area, can effectively solve the filtrate problem that hardens.Though this filter is with the obvious advantage, but design is at present gone up and is had some defective: make skeleton lays the braiding of stainless steel wire or nylon yarn on the surface screen cloth as the cylinder that adopts the boring steel plate to roll, in order to stop that filtrate does not run off, because of the radial-flow filter adopts gravity filtration, filtering velocity is low, filter screen easily stops up, and causes aquifer yield to descend significantly; The filtrate backwash pollution discharge structure defectiveness of design does not reach the expection requirement; Causing the radial-flow filter not produce at home to go up as yet uses.

Three, summary of the invention

The purpose of this utility model is that a kind of radial-flow strainer screen and filtrate backwash blowdown apparatus will be provided, and guarantees that from structural design the radial-flow strainer screen can not stop up, and filtrate is in the purification state for a long time, to reach the filter effect of expection.Utility model is achieved in that 1) the cylindrical shape screen casing that adopts trapezoidal stainless steel wire bond system is as filter center inlet strainer and the periphery filter screen that catchments, the wide bottom surface of trapezoidal silk contacts with filtrate, filtrate is because of the cause of the outer narrow inner width of trapezoidal silk, uses for a long time and the little filtrate of particle diameter mill can not block up and is stuck in the slit; Add the screen casing any surface finish, rigidity is good, and the filtrate moving resistance is little, is convenient to filtrate and forms fluidized state on the screen casing surface, has reduced filtrate and has produced the possibility that hardens.2) bottom of filter awl struggles against water jet nozzle is housed, and the nozzle top is equipped with central tube and disengagement chamber respectively, bores struggle against, overflow cinder notch and fluid level control valve composition filtrate backwash blowdown apparatus with the top.The middle part filtrate that is supplied water the holding filth capacity maximum by low-capacity pump constantly takes the top disengagement chamber to by central tube, the dirt of filtrate absorption transports to collide mutually in the process at current and washes away separation, the filtrate that proportion and particle diameter are bigger slows down in disengagement chamber and falls to returning filtering layer, isolated dirt is because of volume and the less disengagement chamber awl bucket top that floats to of proportion, when accumulating to when a certain amount of, by fluid level control valve timing lifting liquid level, it is discharged from the cinder notch that overflows.Have a small amount of isolated dirt at the filter precoat top and float over liquid level, for this reason at tank body top weldering one awl bucket, can be when raising liquid level in the lump from top awl bucket to excessive cinder notch discharge.The slag situation of overflowing can be monitored on operating desk by telephotography.Thereby guarantee that filtrate is in normal purification state for a long time.The radial-flow filter of implementing as above design can just be usually used in producing.

The radial-flow filter has been compared following characteristics with present extensively adopt following to flow depth layer filter:

1. the filter area along the filtered water stream direction increases progressively, and is low more the closer to the filtering velocity of water outlet place, thereby brought into play the retaining power of filtrate to greatest extent.

2. the continuous automatic backwash of filtrate need not be shut down, and is simple to operate, can monitor.

3. the aquifer yield of unit are is multiplied.

4. floor space is little, the automaticity height, and reduced investment, operating cost is low.

5. filtrate can use for a long time, can not harden, and need not to upgrade.

6. filter effect is stable, insoluble impurities content all can＜10mg/L.

In view of above characteristics, replace used filter with the radial-flow filter, will produce tangible environment, economy and society benefit to the purification of water quality engineering.

Four, description of drawings

Fig. 1 is the front section view of radial-flow filter.

1-center screen casing; The 2-filter material layer; The 3-screen casing that catchments; 4-bottom water cavity; The 5-fluid level control valve; The 6-water jet nozzle; The 7-central tube; The 8-disengagement chamber; 9-top awl bucket.

Coming current radially to flow into bottom water cavity (4) to fluid level control valve (5) by filter material layer (2) to the screen casing that catchments (3) through center screen casing (1) discharges.Backwashing water penetrates through bottom nozzle (6), constantly the filtrate that will pollute is brought central tube (7) into, in uphill process, produce fierce collision and wash away, the dirt that adheres to is separated in disengagement chamber (8) with filtrate, filtrate falls filtering layer after rise because of the gravity effect, dirt drives the top that come-up accumulates in disengagement chamber (8) by current, float over the top of awl bucket (9) on a small amount of, gather situation by telephotography monitoring crud layer, make fluid level control valve (5) action, regularly the lifting liquid level is discharged dirt from overfall, has realized the continuous automatic back-washing operation of filtrate.

Fig. 2 is the partial sectional view of screen casing.The cylindrical shape screen casing adopts stainless steel trapezoidal wire weldering system, and trapezoidal wide bottom surface contacts with filtrate.H=3/5 filtrate minimum grain size among the figure; B=1.4～2mm.

Fig. 3 is the amplification view that bottom nozzle (6) is brought filtrate into central tube (7).

Fig. 4 is top disengagement chamber (8) and the amplification view of boring bucket (9).

Five, the specific embodiment

The radial-flow filtration device structure designs as shown in the figure, and the physical dimension of each parts depends primarily on aquifer yield and flow velocity.

[the screen casing seam is wide to be about 3/5 of particle diameter of filter medium through center screen casing (1) to come water [water level exceeds more than the 1.5m than flood level], going out water flow velocity is controlled at about 40～80m/h], radially by filter material layer (2) [crossing water layer thickness 0.5～0.7m], flow into bottom water cavity (4) from the screen casing that catchments (3) [flow velocity that catchments is controlled at about 8～16m/h], discharge through fluid level control valve (5).[flow is for handling 2%～4% of the water yield by low-capacity pump for backwashing water, about lift 25～30m] extract and filter back water [compressed air of can in water, annotating in case of necessity], penetrate [the nozzle flow velocity is about 5m/s] through nozzle (6), suction band filtrate enters the top through central tube (7) [upflow velocity 0.2～0.5m/s], and [the disengagement chamber upflow velocity is 3.5～5mm/s for the bucket-shaped disengagement chamber (8) of awl, hydraulic detention time is about 4min], excessive row's situation after the dirt separation is monitored the reduction time of setting up fluid level control valve (5) cylinder by telephotography.

Claims

1. radial-flow strainer screen and filtrate backwash blowdown apparatus, the cylindrical shape screen casing that it is characterized in that adopting trapezoidal stainless steel wire bond system is as filter center inlet strainer and the periphery filter screen that catchments; The bottom awl of filter struggles against water jet nozzle is housed, and the nozzle top is equipped with central tube and disengagement chamber respectively, bores struggle against, overflow cinder notch and fluid level control valve composition filtrate backwash blowdown apparatus with the top.