CN208898884U - Variable volume flows counterflow through filter - Google Patents

Abstract

Filter is flowed counterflow through the utility model relates to variable volume, comprising: fixing seat, cockpit, screen pipe, current stabilization set and flow guiding disc；Cockpit can fix the inside that seat is slidably mounted on fixing seat relatively, and gasket is equipped between cockpit and fixing seat, and cockpit and fixing seat surround filtering cavity.Screen pipe is located at center in filtering cavity, and current stabilization set is located at screen pipe periphery, and flow guiding disc is located at right above current stabilization set.This flows counterflow through the volume that filtering cavity can be adjusted flexibly automatically in filter according to actual use situation, improves and flows counterflow through the adaptability of filter, expands the scope of application for flowing counterflow through filter.Also it is able to achieve continuously being separated by filtration for the corpuscle of a variety of different-grain diameters.Belong to filtration and separation techniques field.

Description

Variable volume flows counterflow through filter

Technical field

The utility model relates to what filtration and separation techniques field more particularly to container can be changed to flow counterflow through filter.

Background technique

Corpuscle separates there are two the selections of common method: filtering or centrifugation.

Membrane separation technique is the method for a kind of aperture Selective Separation different component using filter membrane.Filter membrane is that have The material of Selective Separation function.Membrane separation technique has the function of separation, concentration, purifying and purification concurrently, but have it is efficient, energy saving, Environmental protection, the feature that molecular level filters and filter process is simple, easily controllable, it has also become most important means in current separation science One of.

Tangential flow filtration is membrane filtration pattern relatively advanced at present.Tangential flow filtration, which refers to, is trapped corpuscle movement Direction and the perpendicular filter method of film filtering direction；Under the promotion of pressure, liquid stream filter membrane surface generate two component, one A normal force for being perpendicular to filter membrane face makes liquid and enters downstream across filter membrane less than the corpuscle of fenestra.The other is It is parallel to the tangential force in filter membrane face, pushes the corpuscle for being greater than fenestra dynamic along filter membrane surface current, therefore referred to as tangential flow filtration.

The advantage of tangential flow filter is it is clear that still there is also deficiencies:

1, a tangential flow filtration film packet can only separate certain single corpuscle.

2, filter membrane packet need to maximumlly increase filter membrane area, higher cost in manufacture in limited volume.

3, sheet filter membrane is repeatedly turned back in filter membrane packet, causes runner extremely tortuous, flat, long and narrow in film packet, It is poor to the separating effect of high concentration substance or sticky system.

4, filter membrane packet needs to use at elevated pressures, filter membrane inevitably by embolism, can be contaminated, can break Silk.Reduce service life.

5, the structure feature of finished product tangential flow filtration film packet, causes runner dead space volume larger, harvest substance when loss compared with Greatly.

Centrifugal separation technology be by means of centrifuge rotate caused by centrifugal force, according to the sedimentation coefficient of corpuscle, The difference of the differences such as quality, density and buoyancy, the physical separation analytical technology for being separated and being extracted with centrifugal force field.When non-equal When phase system makes rotating motion around a central axis, corpuscle will receive centrifugal force and act on to be moved to deep direction. The speed of rotation is higher, and centrifugal force suffered by corpuscle is bigger.Under identical revolving speed, different size mass density in container Substance can be with different rate sedimentations, through centrifugally operated after a period of time, so that it may realize the effective of density different material Separation.

Filtering is to obtain target product through the aperture of filter medium (such as filter membrane) with corpuscle size.Centrifugation be with The quality difference of corpuscle obtains target product.The separating mechanism of the two is different, and the separation condition of dependence is different.Do not have at present Favorably implement the measure or method that continuously separate to many kinds of substance particle with filtering technique and the centrifugation technique same period.

Utility model content

Aiming at the problems existing in the prior art, the purpose of this utility model is: providing a kind of reverse flow of variable volume Filter, this flows counterflow through filter can be according to actual use situation according to the appearance that filtering cavity is adjusted flexibly automatically that imposes a condition Product, improves and flows counterflow through the adaptability of filter, expands the scope of application for flowing counterflow through filter.

In order to achieve the above object, the utility model adopts the following technical solution:

Variable volume flows counterflow through filter, comprising: screen pipe, cockpit, fixing seat, current stabilization set and flow guiding disc；It is fixed Seat is the main body for flowing counterflow through filter, is divided into top and body portion.Cockpit can fix relatively seat and be slidably mounted on fixing seat In body portion, gasket is equipped between the body portion of cockpit and the body portion of fixing seat, the body portion of cockpit and fixing seat surrounds filtering Cavity.Screen pipe is located at center in filtering cavity, and current stabilization set is located at screen pipe periphery and is fixed in cockpit, and flow guiding disc is located at Right above current stabilization set.After this structure, the body portion of cockpit and fixing seat constitutes the filtering of a complete variable volume Cavity.Reverse flow can be improved according to actual use situation according to the volume that filtering cavity is adjusted flexibly automatically that imposes a condition The adaptability of filter expands the scope of application for flowing counterflow through filter.Screen pipe and fixing seat are stationary parts, and cockpit is Moving component can not only make rotating motion, and can also move up and down or rotate carries out with up and down motion simultaneously.

Preferably, screen pipe includes filter bed and core pipe；The connection of the lower part of filter bed and core pipe, core pipe is interior to flow equipped at least four Road, including feed liquor runner, concentrate runner and at least two filtered solution runners；Cockpit is divided into body portion and bottom, cockpit Body portion is cylindrical shape, and bottom is disk like, and bottom center is cone bowl.After this structure, by feed liquor access by liquid to be filtered Body is conveyed into filtering cavity, and filtered filtered solution and concentrate are transferred out via filtered solution access and concentrate access respectively Filter cavity, realize the process that continuously filters, wherein filtered solution access be at least two, it can be achieved that a variety of different-grain diameters substance The separation of particle.

Preferably, between the upper wall in the body portion that the feed liquor outlet of feed liquor runner is located at flow guiding disc and fixing seat, liquid stream is concentrated The concentrate entrance in road is located in the cone bowl of cockpit bottom, and the filtered solution entrance of filtered solution runner is located at the lower part of filter bed, into The feed liquor outlet in liquid stream road, the filtered solution outlet of the concentrated solution outlet of concentrate runner and filtered solution runner are respectively positioned on fixing seat Top.After this structure, filtered solution entrance is located at the lower part of filter bed, can obtain the smallest harvest volume, be conducive to object The concentration of matter obtains the concentrate of high concentration.Concentrate entrance is located at lowest part in the cone bowl of cockpit bottom, can be by concentrate Total number discharge, therefore, flows counterflow through filter almost without dead space volume.Feed liquor outlet is located above flow guiding disc, and flow guiding disc will convey The liquid to be filtered guiding current stabilization set inside of entrance, can get biggish initial centrifugation kinetic energy.

Preferably, filter bed is saucer-like configuration, is connect with the lower part of core pipe, and filter bed and core pipe junction are equipped with drainage hole；With The filtered solution entrance of filter bed lower part is the diversion trench for the radial type that starting point is equipped with several divergings.After this structure, drain The hydrops inside dish-shaped filter bed can be discharged downwards for hole.

Preferably, be correspondingly provided with the different filter membrane in aperture outside each filtered solution entrance, using after this structure, it can be achieved that different The filtering of the corpuscle of partial size.

Preferably, flow guiding disc is sleeved and fixed with current stabilization set, and the upper surface of flow guiding disc is uniformly provided with several limits being vertically arranged The feed liquor outlet of flowing plate, feed liquor runner is located above current limiting plate.After this structure, flow guiding disc is by the liquid to be filtered of entrance It is oriented to current stabilization set inside, can get biggish initial centrifugation kinetic energy.

Preferably, current stabilization set is divided into body portion and bottom, and the bottom of current stabilization set is saucer-like configuration, and there are circular hole, current stabilization set in center Body portion be cylinder-like structure, current stabilization set body portion be equipped with several exchange holes；Current stabilization set will filter cavity be separated into the area Wen Xuan and The torrent area functional areas Liang Ge, the outside of current stabilization set are the area Wen Xuan, and the inside of current stabilization set is torrent area.Current stabilization set, flow guiding disc with point It is rotate in same direction from cabin with identical angular speed.After this structure, there are opposing stationary passes between current stabilization set and cockpit System, therefore, liquid are in stable rotation status in the area Wen Xuan, optimize the separation function for flowing counterflow through filter.Current stabilization set There are the relationships of relative motion between filter bed, and therefore, liquid is in the flow-disturbing state of torrent in torrent area, can be to filter membrane table Face, which generates, washes away automatic cleaning action, is conducive to remove incrustation.

It preferably, is torrent area between filter bed and the bottom of current stabilization set, between the bottom of current stabilization set and the bottom of cockpit Liquid gap is constituted out, feed liquor gap is constituted between flow guiding disc and the upper wall in fixed base frame portion；Liquid gap, cone bowl and concentration liquid stream out Road forms complete concentrate access, and diversion trench and filtered solution runner form complete filtered solution access, feed liquor runner and feed liquor Gap forms complete feed liquor access.After this structure, guidance is played to the discharge of concentrate in liquid gap out and protection is made With.

Preferably, the projected area of flow guiding disc is less than the projected area of current stabilization set, the projected area of current stabilization set is less than separation The projected area in cabin；Gasket is equipped between the body portion of cockpit and the body portion of fixing seat.After this structure, so that substance Particle has biggish initial centrifugation kinetic energy, improves separating effect.Corpuscle enters the area Wen Xuan by exchanging hole, is conducive to The stabilization of the area Wen Xuan liquid in rotation system.

A kind of application flowing counterflow through filter, each interface connect to be made with silica gel hose and disposably make on the top of fixing seat Filtration applications.Plastic cement Rule pin end, joint protective sleeve and feed liquor silica gel hose constitute port adapter tube.Four port adapter tubes It is socketed in liquid inlet, concentrated solution outlet, the outlet of the first filtered solution and the outlet of second filtered solution respectively, being made can be used directly Disposably flow counterflow through filter suit.

In field of biological pharmacy, cell is the producer of drug.There is the growth of a kind of cell to need (adherent using adhesive Formula) culture mode carry out.These cell adhesions are grown in microcarrier (spherical shape), and microcarrier suspension is in culture solution.? When harvesting cell, cell is set to fall off from microcarrier by the effect of certain enzyme；At this point, have in culture solution the naked pearl of microcarrier, Cast-off cells, cell fragment.Their particle size situation is: the naked pearl > cast-off cells > cell fragment of microcarrier.For one Secondary property harvests pure cast-off cells, can be used and disposably flows counterflow through filter suit.Disposably flow counterflow through in filter First filter sizes are less than cast-off cells, are greater than cell fragment；Second filter sizes are less than the naked pearl of microcarrier, thin greater than falling off Born of the same parents.

Rule female connector of Rule pin end connection cell culture bags outlet at liquid inlet end；The Shandong at concentrated solution outlet end Rule female connector of your the pin end connection naked pearl collecting bag entrance of microcarrier；Rule pin end of first filtered solution outlet end connects Rule female connector of cell fragment collecting bag entrance；Rule pin end of second filtered solution outlet end connects cast-off cells collecting bag Rule female connector of entrance.

Step 1: first closing the second filtered solution access and concentrate access when cell fragment and culture solution is collected by filtration；It is micro- By the first membrane retention, cell fragment is not trapped for the naked pearl of carrier and cast-off cells, is collected into carefully by the first filtered solution access Born of the same parents' garbage collection bag.The naked pearl of microcarrier and cast-off cells, which stay in, disposably to be flowed counterflow through in filter.

Step 2: closing the first filtered solution access after having collected cell fragment, opening the second filtered solution access, microcarrier Naked the second membrane retention of integument, cast-off cells are not trapped, and are collected into cast-off cells collecting bag by the second filtered solution access.It is micro- The naked pearl of carrier, which stays in, disposably to be flowed counterflow through in filter.

Finally, closing the first filtered solution access and the second filtered solution access after having collected cast-off cells, it is logical to open concentrate Road stays in the naked pearl of the microcarrier flowed counterflow through in filter by concentrate access and is collected into the naked pearl collecting bag of microcarrier.

The principles of the present invention are: cockpit provides adjustable rotation function by rotating electric machine, cockpit, flow guiding disc and Current stabilization set rotates in same direction together with cockpit according to same angular speed, there is the corresponding knot agreed with turntable outside the bottom of cockpit Structure realizes that docking is fixed.Straight reciprocating motion motor drives rotating electric machine and cockpit to realize and moves back and forth.

Axis connection (see Fig. 6) is rotated with rotating electric machine below turntable, is controlled by rotating electric machine.Rotating electric machine is fixed on up and down On motion platform.The movement of straight reciprocating motion motor control up and down motion platform.The position of up and down motion platform is by photoelectric sensing Device feeds back to control system.Control system controls straight reciprocating motion motor and rotating electric machine, realize cockpit rotation and/or on Lower movement.

Positive pressure is provided by pump or/and negative pressure forms driving of the pressure difference drop of filter membrane two sides as liquid flowing in cockpit Power.

By adjusting the pressure difference drop and centrifugal rotational speed of filter membrane upstream and downstream, the use item for flowing counterflow through filter can be optimized Part.It controls each substance and is flowing counterflow through the residence time in filter, obtain separation product.

Corpuscle by membrane retention, gathered by the double acting of centrifugal force and gravity in cockpit inner wall and settled downwards, Along the cone bowl that liquid gap out reaches cockpit bottom, it is discharged by concentrate runner.The corpuscle not being trapped can be from filter Cross the discharge of liquid access.

It is less than pressure difference of the corpuscle of filter sizes between filter membrane upstream and downstream when cockpit rotates, in liquid and drops promotion Under across filter membrane, filter liquor is discharged through filtered solution access；Greater than filter sizes corpuscle by while membrane retention by from Mental power function counter motion, far from filter membrane face.Because of the direction of motion for being trapped corpuscle and filter liquor direction in structure On the contrary, being properly termed as " reverse flow filtering ".

The schematic diagram for flowing counterflow through filtration principle is shown in Fig. 5.

The conventional unit for measuring centrifugal force is " relative centrifugal force (RCF) " or " digital xg ", as long as RCF value is constant, one Sample can obtain identical result on different centrifuges.RCF is exactly times that practical centrifugal field is converted into acceleration of gravity Number.

Relative centrifugal force (RCF) calculation formula:

RCF=XN²·1.118·10^-5

In formula: X is the radius distance (cm) of centrifugal rotor；N is rotor revolution (rpm) per minute.

It is therefore seen that: the size of relative centrifugal force (RCF) is directly proportional to the centrifugation size of radius, with revolving speed square at just Than.

In cockpit, corpuscle is mainly by centrifugal force, filtering power-assisted (related to the pressure difference of filter membrane two sides drop), liquid The influence of resistance (related to viscosity, shape, volume), gravity, density that body is displaced corpuscle.

In certain liquid system, in the case where revolving speed (rpm) is constant, same substance particle is in different radiuss of turn Under, suffered centrifugal force is different；Remoter from the center of circle, suffered centrifugal force is bigger.

Corpuscle enters the position in the area Wen Xuan, determines that it obtains the size of initial centrifugation power；It is remoter from the center of circle suffered Centrifugal force is bigger.

When centrifugal force is greater than filtering power-assisted+displacement resistance, corpuscle is gradually distance from filter membrane；When centrifugal force was less than When filtering power-assisted+displacement resistance, corpuscle moves closer to filter membrane.Therefore, liquid inlet position needs to have as far as possible far from the center of circle Help corpuscle and obtain higher initial centrifugation kinetic energy, improves separating effect.

In the fixed cockpit of radius of turn.For a certain corpuscle, revolving speed be an important adjusting because Element.

Under the premise of liquid inlet is determining, centrifugal force is greater than filtering power-assisted+resistance to displacement, cockpit rotation speed and filter The control condition that pressure difference drops between film upstream and downstream can there are many combinations, to match different separation needs.

Generally speaking, the utility model has the advantages that

1, flowing counterflow through filter has the ability being continuously separated by filtration to the corpuscle implementation of different-grain diameter.

2, can flexible modulation strained volume, improve adaptability, expand the scope of application.

3, cockpit is divided into inside and outside two functional areas, and the liquid in the area Wen Xuan is in always stablizes eddy flow state, optimization Continuous separation condition.

4, torrent flow-disturbing occurs for the liquid in torrent area, has to filter membrane surface and washes away automatic cleaning action, is conducive to removal incrustation, Prolong the service life.

5, flow guiding disc is by the liquid to be filtered delivered into guiding current stabilization set inside, and the centrifugal force of acquisition is bigger, separation effect Rate is higher.

6, cockpit and access are interior almost without dead space, and collection rate is higher.

Detailed description of the invention

Fig. 1 is the structural schematic diagram for flowing counterflow through filter of the utility model.

Fig. 2 is the structural schematic diagram of screen pipe.

Fig. 3 is the partial enlarged view of the coupling part of core pipe lower part and filter bed.

Fig. 4 is the structural schematic diagram of flow guiding disc.

Fig. 5 is to flow counterflow through filtration principle schematic diagram.

Fig. 6 is the structural schematic diagram of the utility model transmission control part point.

Fig. 7 is the stereoscopic schematic diagram of current stabilization set.

Fig. 8 is that current stabilization covers inverted stereoscopic schematic diagram.

Fig. 9 is the structural schematic diagram of fixing seat.

Figure 10 is screen pipe plumb cut figure.

Label and corresponding parts title in figure are as follows:

1- core pipe, 2- cockpit, 3- fixing seat, 4- flow guiding disc, 5- current stabilization set, 6- filter bed, the first filter membrane of 7-, 8- second are filtered Film, 9- feed liquor gap, 10- feed liquor runner, 11- liquid inlet, the outlet of 12- feed liquor, 13- the first filtered solution runner, 14- first are filtered Cross liquid outlet, 15- the first filtered solution entrance, 16- the second filtered solution runner, the outlet of the second filtered solution of 17-, the second filtered solution of 18- Entrance, 19- go out liquid gap, 20- concentrate runner, 21- concentrated solution outlet, 22- concentrate entrance, 23- exchange hole, 24- water conservancy diversion Slot, 25- cone bowl, 26- drainage hole, 27- current limiting plate, 28- filter membrane fixed frame, 29- gasket, the particle of 30- small particle, 31- are big The particle of partial size, 32- filter membrane, 33- linear reciprocating motor, 34- rotating electric machine, 35- turntable, 36- up and down motion platform, 37- control Device processed, 38- photoelectric detector, the top of 39- fixing seat, the body portion of 40- fixing seat, the area A- Wen Xuan, B- torrent area.Arrow in Fig. 1 Head indicates the flow direction of corpuscle.

Specific embodiment

It is next with reference to the accompanying drawings and examples that the utility model is described in more detail.

Embodiment 1

By the separation for flowing counterflow through filter and being used for the corpuscle of three kinds of different-grain diameters of variable volume in the present embodiment.

As shown in Figure 1, the filter that flows counterflow through of variable volume includes fixing seat, cockpit, screen pipe, current stabilization set and water conservancy diversion Disk.

Fixing seat is to flow counterflow through the main body of filter, is divided into top and body portion.There is feed liquor runner, dense in the top of fixing seat Contracting liquid stream road, the first filtered solution runner and the second filtered solution runner.There are liquid inlet, concentrated solution outlet, the first filtered solution to go out outside Mouth and the outlet of the second filtered solution.The body portion of fixing seat is cylindrical shape, and lower section is opening.

The inside in the body portion of fixing seat is arranged in cockpit, is divided into body portion and bottom.The body portion of cockpit is cylindric knot Structure, top are open, and the bottom of cockpit is saucer-like configuration, and the bottom center of cockpit is the cone bowl of bullet-shaped.Cockpit is Moving component can not only make rotating motion, and can also move up and down or be rotated and moved up and down simultaneously.

The body portion of cockpit and fixing seat constitutes filtering container, there is gasket between fixing seat and cockpit.Cockpit bottom Portion has the counter structure agreed with turntable realization to dock.

Axis connection (see Fig. 6) is rotated with rotating electric machine below turntable, is controlled by rotating electric machine.Rotating electric machine is fixed on up and down On motion platform.The movement of straight reciprocating motion motor control up and down motion platform.The position of up and down motion platform is by photoelectric sensing Device feeds back to control system.Control system controls straight reciprocating motion motor and rotating electric machine, drive cockpit rotation and/or on Lower movement.

Screen pipe is located in filtering container, is divided into core pipe and filter bed；There are feed liquor runner, concentrate runner, first in core pipe Filtered solution runner and the second filtered solution runner, with the feed liquor runner in the top of fixing seat, concentrate runner, the first filtration liquid stream Road and the corresponding connection of the second filtered solution runner.Filter bed is saucer-like configuration, above there is diversion trench, the first filter membrane and the second filter membrane, first Filtered solution entrance and the second filtered solution entrance.Filtered solution entrance is located at filter bed low level.Filtering bottom of the tube is suspended from cone bowl top, concentration Liquid entrance protrudes into cone bowl；Feed liquor runner is independent circular ring shape cannula structure.Concentrate runner, the first filtered solution runner and Two filtered solution runners are mutually independent tubular structure.

Filter bed is connected with the bottom of core pipe and junction sets that there are four for the drainage hole of hydrops in filter bed to be discharged.

Screen pipe and fixing seat are stationary parts.

Feed liquor access is made of liquid inlet, feed liquor runner, feed liquor outlet and feed liquor gap.

First filtered solution access is by the first filtered solution entrance, the first filtered solution runner, the first filtered solution export mixes.

Second filtered solution access is by the second filtered solution entrance, the second filtered solution runner, the second filtered solution export mixes.

Concentrate access is by concentrated solution outlet, concentrate runner, concentrate entrance, cone bowl and out liquid gap is constituted.

The concentrated solution outlet at the top of fixing seat, liquid inlet, the outlet of the first filtered solution and the second filtered solution outlet end connect Connect corresponding hose and container.

In the corpuscle filtering for carrying out three kinds of different-grain diameters, the aperture of the first filter membrane is less than the second filter membrane.Three kinds are not Mixing liquid with partial size is injected by feed liquor access.Large-sized corpuscle can divided by the first filter membrane and the second membrane retention From in cabin, collected by concentrate access.The corpuscle of middle partial size is filtered by the first membrane retention, by the second filter membrane, is passed through Second filtered solution access is collected.The particle of small particle is not trapped, and is collected by the first filtered solution access.

A kind of continuous separation method:

Step 1: needing to close the second filtered solution access and concentrate access when the particle of small particle is collected by filtration；Big grain The particle of diameter and medium grain size is not trapped by the first membrane retention, the particle of small particle, is collected by the first filtered solution access To collecting bag.

Step 2: closing the first filtered solution access after having collected the particle of small particle, opening the second filtered solution access, greatly The particle of partial size is not trapped by the second membrane retention, the particle of middle partial size, is collected into collecting bag by the second filtered solution access.

Finally, closing the first filtered solution access and the second filtered solution access, concentrate access is opened, by the second membrane retention Large-sized particle collecting bag is collected by concentrate access.

Other than the mode that above-described embodiment refers to, the filter that flows counterflow through of variable volume can also be used for three kinds or more The separation of the corpuscle of different-grain diameter.The filter bed of screen pipe may be polyhedron, the quantity in polyhedral filter face according to The number of isolate determines that, for the filter bed of more filtering surfaces, the selection of filter sizes is thought corresponding with filtering surface.These transformation sides Formula is within the protection scope of the present utility model.

Cockpit shapes and sizes can manufacture into different shape according to the actual application, it is not limited to which embodiment is retouched It states.The position of liquid inlet can manufacture according to the actual application, it is not limited to described by embodiment.Screen pipe can be according to reality Border application needs to manufacture into different shape, it is not limited to described by embodiment.Filter membrane shape can adopt according to the actual application With different shape, it is not limited to described by embodiment.The firm form of filter membrane can use according to the actual application, not office It is limited to described by embodiment.

Flowing counterflow through filter can not only be used continuously, can also interval use.It cannot be only used for being separated by solid-liquid separation, also can be used In including protein chemistry, molecular biology, immunology, the fields such as biochemistry and microbiology are divided from small biomolecule From big biomolecule, cell suspending liquid and clarified broth and cell lysate etc. are harvested.It is more advantageous to high concentration material On-line continuous separation.

Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.

Claims (9)

1. variable volume flows counterflow through filter characterized by comprising screen pipe, cockpit, fixing seat, current stabilization are covered and led Flow table；Cockpit can fix the inside that seat is slidably mounted on fixing seat relatively, and gasket is equipped between cockpit and fixing seat, Cockpit and fixing seat surround filtering cavity；Screen pipe center in filtering cavity, it is peripheral and solid that current stabilization set is located at screen pipe Due in cockpit, flow guiding disc is located at right above current stabilization set.

2. variable volume described in accordance with the claim 1 flows counterflow through filter, it is characterised in that: screen pipe includes filter bed and core Pipe；The connection of the lower part of filter bed and core pipe, is equipped at least four runners in core pipe, including feed liquor runner, concentrate runner and at least Two filtered solution runners；Cockpit is divided into body portion and bottom, and the body portion of cockpit is cylinder-like structure, and bottom is saucer-like configuration, Bottom center is the cone bowl of bullet-shaped.

3. variable volume flows counterflow through filter according to claim 2, it is characterised in that: fixing seat is divided into body portion and top Portion, between flow guiding disc and the upper wall in the body portion of fixing seat, the concentrate of concentrate runner enters for the feed liquor outlet of feed liquor runner Mouth is located at the cone bowl of cockpit bottom, and the filtered solution entrance of filtered solution runner is located at the lower part of filter bed, the feed liquor of feed liquor runner The filtered solution outlet of outlet, the concentrated solution outlet of concentrate runner and filtered solution runner is respectively positioned on the top of fixing seat.

4. variable volume described in accordance with the claim 3 flows counterflow through filter, it is characterised in that: filter bed is saucer-like configuration, with The lower part of core pipe connects, and filter bed and core pipe junction are equipped with drainage hole；If being equipped with by starting point of the filtered solution entrance of filter bed lower part The diversion trench of the radial type of dry item diverging.

5. variable volume flows counterflow through filter according to claim 4, it is characterised in that: corresponding outside each filtered solution entrance Equipped with the different filter membrane in aperture.

6. variable volume described in accordance with the claim 3 flows counterflow through filter, it is characterised in that: the upper surface of flow guiding disc is uniform Equipped with several current limiting plates being vertically arranged, the feed liquor outlet of feed liquor runner is located above current limiting plate.

7. variable volume flows counterflow through filter according to claim 5, it is characterised in that: the bottom of current stabilization set is disk like Structure, body portion are cylinder-like structure, and body portion cylinder-like structure part is equipped with several exchange holes；Current stabilization set, flow guiding disc and cockpit It is rotate in same direction with identical angular speed, current stabilization set is separated into the area Wen Xuan and the torrent area functional areas Liang Ge, current stabilization set for cavity is filtered Outside be the area Wen Xuan.

8. variable volume flows counterflow through filter according to claim 7, it is characterised in that: the bottom of filter bed and current stabilization set Between be torrent area, current stabilization set bottom and cockpit bottom between constitute out liquid gap, the body portion of flow guiding disc and fixing seat Upper wall between constitute feed liquor gap；Liquid gap, cone bowl and concentrate runner form complete concentrate access out, diversion trench and Filtered solution runner forms complete filtered solution access, and feed liquor runner and feed liquor gap form complete feed liquor access.

9. variable volume described in accordance with the claim 1 flows counterflow through filter, it is characterised in that: the projected area of flow guiding disc is small It is less than the projected area of cockpit in the projected area of the projected area of current stabilization set, current stabilization set；The lateral wall in the body portion of cockpit Gasket is equipped between the inner sidewall in the body portion of fixing seat.