CN114917761A - Rotary ultrasonic filtering structure and rotary ultrasonic filtering device - Google Patents

Abstract

The invention provides a rotary ultrasonic filtering structure and a rotary ultrasonic filtering device, wherein the rotary ultrasonic filtering structure comprises an accommodating cavity, a rotary driving unit and a membrane filtering unit, the membrane filtering unit is arranged in the accommodating cavity, the rotary driving unit is arranged outside the accommodating cavity, the rotary driving unit drives the membrane filtering unit to rotate, the membrane filtering unit comprises a hollow rotating shaft and at least two filtering membranes, the two filtering membranes are arranged on the hollow rotating shaft, a cross flow channel is formed between the two adjacent filtering membranes, a water production channel is arranged in each filtering membrane, the water production channel is communicated with the inside of the hollow rotating shaft, an ultrasonic unit is also arranged in the accommodating cavity and comprises an ultrasonic emitter, the ultrasonic emitter is arranged in the cross flow channel and can emit ultrasonic waves to the filtering membranes; the rotary ultrasonic filter device includes a rotary ultrasonic filter structure. The invention can reduce the sediment on the surface of the membrane and improve the filtration efficiency and stability.

Description

Rotary ultrasonic filtering structure and rotary ultrasonic filtering device

Technical Field

The invention relates to the technical field of membrane filtration, in particular to a rotary ultrasonic filtering structure and a rotary ultrasonic filtering device.

Background

The cross flow filters to the tangent "cross flow of a kind of with filtration membrane" form of liquid flow, because its high surface cross flow, the shearing force on membrane surface has been improved, there is certain scouring action to membrane surface, can make the filtration process work under the condition of accumulating a small amount of filter cakes all the time, concentration polarization and membrane pollution in the membrane separation process have been improved to a certain extent, but increase along with the filtration time, receive the influence of factors such as liquid reflux resistance, the tangential velocity of flow that the fluid produced membrane surface, the sedimentary deposit that lacks filtration membrane surface is washed out completely along with the time lapse. With the deepening of relevant theories and experimental researches of a membrane separation mode, a cross flow filtration mode is optimized to obtain dynamic cross flow filtration, and the centrifugal force and the shearing force generated by fluid rotation and the turbulence effect of a feed liquid are utilized to enable the feed liquid to generate higher tangential flow velocity on the surface of a membrane, so that the growth of a filter cake layer is inhibited, the pollution on the surface of the membrane can be more effectively eliminated, the concentration polarization is reduced, and the filtration stability of the membrane system is improved.

However, in some fields such as bio-pharmaceuticals, novel nano-material preparation, sewage treatment and the like, the conditions of high material viscosity, high impurity content, high solid content and the like exist, so that the membrane filtration device can easily reach a pollution level in a short time, and the phenomena of reduced filtration efficiency, poor filtration stability, low concentration and the like are caused.

In the prior art, rotary ceramic membrane filtration devices are known, which are usually realized by using regular disk membranes, which are fixed on a hollow rotating shaft. The mode is convenient for mechanical fixation and installation of the circular membrane, but can lead to the liquid to tend to be orderly in the flow field so that particles are gradually deposited on the surface of the membrane, and further lead to the reduction of the pollution resistance of the membrane in the separation process, thereby limiting the application field of the rotary membrane filtration system.

Disclosure of Invention

The first purpose of the invention is to provide a rotary ultrasonic filtering structure which can reduce the sediment on the surface of a membrane and improve the filtering efficiency and stability.

A second object of the present invention is to provide a rotary filtering apparatus comprising the above rotary ultrasonic filtering structure.

In order to achieve the first object, the present invention provides a rotary ultrasonic filtering structure, which includes an accommodating chamber, a rotary driving unit and a membrane filtering unit, wherein the membrane filtering unit is disposed in the accommodating chamber, the rotary driving unit is disposed outside the accommodating chamber, the rotary driving unit drives the membrane filtering unit to rotate, the membrane filtering unit includes a hollow rotating shaft and at least two filtering membranes, the two filtering membranes are disposed on the hollow rotating shaft, a cross flow channel is formed between the two adjacent filtering membranes, a water production channel is disposed in the filtering membrane, a liquid seepage channel is disposed in the hollow rotating shaft, the water production channel is communicated with the liquid seepage channel, an ultrasonic unit is further disposed in the accommodating chamber, the ultrasonic unit includes an ultrasonic emitter, the ultrasonic emitter is disposed in the cross flow channel, and the ultrasonic emitter can emit ultrasonic waves toward the filtering membranes.

According to the scheme, the ultrasonic transmitter is arranged in the cross flow channel and can transmit ultrasonic waves to the filtering membrane, and the ultrasonic waves can enable disordered turbulence in the accommodating cavity to be more disordered, so that the deposition of particles on the surface of the filtering membrane is effectively reduced, the surface pollution of the filtering membrane is delayed, and the filtering efficiency and the stability of the filtering membrane are improved; the invention can better adapt to the material environment with high concentration, high solid content and high viscosity, and greatly improves the separation and filtration efficiency and performance of the filtration membrane.

The further scheme is that the ultrasonic transmitter is in a rod shape, the ultrasonic transmitter is fixedly arranged between two adjacent filtering membranes, and the filtering membranes can rotate relative to the ultrasonic transmitter.

By above-mentioned scheme, through the ultrasonic transmitter who sets up rod-like structure, when the relative ultrasonic transmitter of hollow rotation axis drive filtration membrane was rotatory, ultrasonic transmitter played the vortex pole effect, was favorable to increasing fluid flow and turbulence disturbance.

The further scheme is that an opening is formed in one end, far away from the hollow rotating shaft, of the cross-flow channel, and the ultrasonic transmitter penetrates through the opening from the outward side of the filtering membrane to extend to the inward side of the filtering membrane.

According to the scheme, the ultrasonic emitter can conveniently enter the cross flow channel by arranging the opening, and the filtering membrane cannot collide with the ultrasonic emitter when the filtering membrane rotates; the length of the ultrasonic emitter radiates the whole water production channel of the filter membrane to the greatest possible extent, so as to ensure that the ultrasonic energy effectively acts on the filter holes on the surface of the filter membrane to rapidly sweep the sediment.

The further proposal is that a plurality of filtering membranes are arranged, and the filtering membranes are arranged at intervals up and down; the ultrasonic transmitter is provided with a plurality of, and ultrasonic transmitter sets up between two adjacent filtration membranes.

According to the scheme, the arrangement of the plurality of filtering membranes and the plurality of ultrasonic emitters is favorable for forming a plurality of cross flow channels and a plurality of turbulent flow fields, and the plurality of turbulent flow fields are mutually matched to form a disordered turbulent flow field with large volume and high strength, so that the filtering efficiency of liquid is improved.

The ultrasonic unit further comprises a mounting seat, the mounting seat is arranged on the inner wall of the accommodating cavity, fixed ends of the ultrasonic transmitters are connected to the mounting seat respectively, and the ultrasonic transmitters are correspondingly arranged up and down in the axial direction of the hollow rotating shaft or are arranged in a staggered mode.

The further proposal is that all the filter membranes are arranged in parallel, and the ultrasonic transmitter and the filter membranes are arranged in parallel.

By the scheme, the filter membrane is parallel to the filter membrane, so that the rotation resistance is reduced, and the filter membrane is convenient to rotate.

The further proposal is that the filter membrane is of a disc structure or a disc structure, and the filter membrane is a ceramic membrane, a PVDF membrane, a metal membrane or an IPUF soft membrane.

In order to achieve the second object, the present invention provides a rotary ultrasonic filtering apparatus, which includes a mounting bracket, a separation tank and the rotary ultrasonic filtering structure, wherein the separation tank is disposed on the mounting bracket, a membrane filtering unit of the rotary ultrasonic filtering structure is disposed in the separation tank, a rotary driving unit of the rotary ultrasonic filtering structure is disposed outside the separation tank, an ultrasonic unit of the rotary ultrasonic filtering structure is disposed on an inner wall of the separation tank, and a filtering fluid in the separation tank generates disordered turbulence during rotation.

According to the scheme, under the rotating action of the membrane filtering unit, disordered turbulence can be formed in the separation tank, the ultrasonic transmitter is arranged to transmit ultrasonic waves to strengthen the disorder degree of the turbulence, and the ultrasonic waves can sweep the surface of the filtering membrane to reduce or remove sediments on the surface of the filtering membrane, so that the filtering efficiency of the filtering membrane is improved, and the effective service life of the filtering membrane is prolonged.

The further proposal is that one end of a hollow rotating shaft of the membrane filtration unit penetrates out of the separation tank, a penetrating fluid outlet is arranged at one end of the hollow rotating shaft penetrating out of the separation tank in a communicating way, and the penetrating fluid outlet is communicated with a penetrating fluid channel of the hollow rotating shaft.

The further scheme is that a liquid inlet pipe and a sewage draining pipe are arranged at the lower part of the separation tank, a liquid discharging pipe is arranged at the upper part of the separation tank, and pressure detectors are arranged at the upper parts of the liquid inlet pipe, the sewage draining pipe and the separation tank.

Drawings

FIG. 1 is a block diagram of an embodiment of a rotary ultrasonic filter apparatus of the present invention.

FIG. 2 is a cross-sectional view of a rotary ultrasonic filter structure in an embodiment of a rotary ultrasonic filter apparatus of the present invention.

Fig. 3 is a cross-sectional view of a membrane filtration unit in an embodiment of a rotary ultrasonic filtration apparatus of the present invention.

FIG. 4 is a block diagram of an ultrasonic unit in an embodiment of a rotary ultrasonic filter apparatus of the present invention.

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

Detailed Description

Referring to fig. 1 to 4, the rotary ultrasonic filter device provided by the present embodiment includes a mounting bracket 1, a separation tank 2 and a rotary ultrasonic filter structure, wherein the separation tank 2 is disposed on the mounting bracket 1, and an accommodating cavity is disposed inside the separation tank 2. The rotary ultrasonic filtering structure comprises a rotary driving unit 31, a membrane filtering unit 32 and an ultrasonic unit 33, wherein the membrane filtering unit 32 and the ultrasonic unit 33 are both arranged in an accommodating cavity, the rotary driving unit 31 is arranged on the outer side of the lower part of the separation tank 2 and is hung on the mounting bracket 1, the ultrasonic unit 33 is fixedly arranged on the inner wall of the separation tank 2, and the rotary driving unit 31 can drive the membrane filtering unit 32 to rotate relative to the ultrasonic unit 33 in the separation tank 2. During the rotation process of the membrane filtering unit 32, the filtering fluid in the containing cavity can generate disordered turbulence, and the arrangement of the ultrasonic unit 33 can increase the disorder degree of the disordered turbulence and play a role in increasing the fluid flow and turbulence disturbance.

Referring to fig. 2 and 3, the membrane filtration unit 32 includes a hollow rotating shaft 321 and a plurality of filtration membranes 322, an upper portion of the hollow rotating shaft 321 is disposed in the separation tank 2, a lower portion of the hollow rotating shaft 321 penetrates out of the separation tank 2, and the hollow rotating shaft 321 and the separation tank 2 are hermetically connected through a mechanical sealing assembly, which is a standard component in the art and is not described herein again. The rotation driving unit 31 includes a driving motor, preferably an asynchronous motor, and a reducer, to which a driving shaft of the driving motor is connected, the reducer being a parallel shaft type reducer, and the reducer being connected to a lower portion of the hollow rotating shaft 321 through a hollow shaft locking device. A liquid permeating channel is arranged in the hollow rotating shaft 321, a liquid permeating outlet 3211 is arranged at one end of the hollow rotating shaft 321 penetrating out of the separation tank 2, and the liquid permeating outlet 3211 is communicated with the liquid permeating channel.

The plurality of filter membranes 322 are divided into two or three groups of equal number, and the groups are disposed on the hollow rotating shaft 321 at regular intervals. In the embodiment, for example, two groups of six filter membranes 322 are provided, the extending direction of the filter membranes 322 is perpendicular to the axial direction of the hollow rotating shaft 321, the six filter membranes 322 in the same group are uniformly provided at intervals up and down and fixed by the overlying plate 323, the filter membranes 322 at the lowermost layer and the uppermost layer are respectively fastened by the lower limiting plate 324 and the upper limiting plate 325, and the filter membranes 322, the lower limiting plate 324, the upper limiting plate 325 and the overlying plate 323 are hermetically provided. The membrane filtration unit 32 of the present embodiment adopts a modular design, and the filtration membrane 322 can be replaced independently, which provides high flexibility.

All the filter membranes 322 are arranged in parallel, a cross flow channel 326 is formed between the two adjacent upper and lower filter membranes 322, and the cross flow channel 326 is communicated with the accommodating cavity of the separation tank 2, so that the filtered fluid can conveniently enter and exit the cross flow channel 326. The surface of the filtering membrane 322 is provided with filtering holes, a water producing channel 3221 is arranged in the filtering membrane 322, and the filtering holes are communicated with the penetrating fluid outlet 3211 through the water producing channel 3221 and the penetrating fluid channel. The membrane filtering unit 32 is driven by the rotary driving unit 31 to rotate, so that a disordered turbulence phenomenon inconsistent with the filtering direction can be formed, the deposition of particles on the surface of the membrane can be avoided, and the membrane pollution is reduced.

Referring to fig. 3 and 4, the ultrasonic unit 33 includes a mounting base 331 and a plurality of ultrasonic transmitters 332, the mounting base 331 is disposed on an inner wall of the separation tank 2 and extends in a height direction of the separation tank 2, and the plurality of ultrasonic transmitters 332 are disposed in parallel on the mounting base 331. Specifically, the fixed ends of the ultrasonic transmitters 332 are connected to the mounting base 331, and the free ends of the ultrasonic transmitters 332 extend toward the hollow rotating shaft 321. The plurality of ultrasonic transmitters 332 are disposed in an up-down correspondence or the plurality of ultrasonic transmitters 332 are disposed in a staggered manner in the axial direction of the hollow rotating shaft 321. The ultrasonic transmitter of the present embodiment may be an ultrasonic transducer or an ultrasonic vibrator.

The number of the ultrasonic emitters 332 is preferably one less than the number of the filtering membranes 322 in one group, and in this embodiment, five ultrasonic emitters 332 are respectively disposed in the corresponding cross-flow channels 326, and the ultrasonic emitters 332 can emit ultrasonic waves toward the filtering membranes 322. Specifically, the other parts of the cross-flow channel 326 than the connection with the hollow rotating shaft 321 communicate with the inside of the separation tank 2, and particularly, the cross-flow channel 326 is provided with an opening at an end away from the hollow rotating shaft 321. The ultrasonic transmitter 332 is formed in a rod shape, the ultrasonic transmitter 332 extends from the outward side of the filtering membrane 322 to the inward side of the filtering membrane 322 through the opening, and preferably, the free end of the ultrasonic transmitter 332 is as close to the hollow rotating shaft 321 as possible, so that the ultrasonic transmitter 332 can radiate the whole water generating passage 3221 of the filtering membrane 322 to the maximum extent possible to ensure that the ultrasonic energy acts on the filtering membrane 322 with a larger area. The ultrasonic transmitter 332 is fixedly disposed between two adjacent filtering membranes 322, and preferably, the distance from the ultrasonic transmitter 332 to the filtering membranes 322 on the upper and lower sides is equal. The ultrasonic transmitter 332 is disposed in parallel with the filtering membrane 322, which is advantageous for facilitating the rotation of the membrane filtering unit 32.

The ultrasonic emitter 332 of the embodiment is fixedly arranged in the cross-flow channel 326, the filtering membrane 322 can rotate relative to the ultrasonic emitter 332, the ultrasonic emitter 332 can emit ultrasonic waves to the filtering membrane 322 on the upper side and the lower side, a large number of small bubbles can be generated when the ultrasonic waves act on fluid, the small bubbles can continuously move along with the vibration of surrounding media, grow up or are suddenly broken, a local turbulent environment is formed, under the matching action of centrifugal force and shearing force, and the cavitation action of the ultrasonic waves is utilized, a plurality of directional forces are formed in the cross-flow channel 326, the surface of the filtering membrane 322 can be effectively washed away, deposited layers on the surface of the filtering membrane 322 can be effectively damaged, the concentration polarization phenomenon is weakened, the membrane pollution degree is reduced, the filtering operation can be kept continuous and stable, and the filtering device is more suitable for filtering separation of a high-viscosity high-solid-content material system. The rod-shaped ultrasonic transmitter 332 itself may also function as a spoiler. When the fluid rotates along with the hollow rotating shaft 321 in the separation tank 2, the fluid slowly moves in parallel with the filtering membrane 322, so that the shearing force applied to the filtering membrane 322 is reduced, and the filtering efficiency is lowered. At this time, the turbulence bars are required to disturb the moving direction of the fluid and increase the shearing force to enhance the turbulence intensity of the fluid and further increase the disorder degree of the disorder turbulence in the separation tank 2.

The filtering membrane 322 is a disc structure or a disc structure, and the disc filtering membrane has the advantages of stable structure, high rotation speed and good separation effect. The filter membrane 322 mainly adopts A1 ₂ O ₃ 、ZrO ₂ 、Ti0 ₂ And Si0 ₂ The pore diameter of the porous membrane prepared by the inorganic materials is 0.01-50 μm, and the porous membrane can adapt to the operating environment with higher rotating speed of 300-1000RPM and the like. The filter membrane 322 can be a hollow ceramic membrane, PVDFA film, a metal film, or a film in film form, wherein the metal film and film in film form are suitable for use in a lower rotational speed operating environment. PVDF membrane, polyvinylidene difluoride membrane, is a solid support commonly used in western blotting. The film is preferably a commercially available IPUF film.

Referring to fig. 1 and 2, the separation tank 2 includes a tank body 21 and an upper cover 22, the upper cover 22 is provided with a press bolt (not shown), the upper cover 22 is fastened and connected to the tank body 21 through the press bolt, and the upper cover 22 is connected to the upper portion of the tank body 21 through a seal ring. A drain pipe 221 is provided on the top of the upper lid 22, the drain pipe 221 communicates with the inside of the tank 21, and the drain pipe 221 also has an exhaust function. The tank body 21 is provided at the bottom thereof with a liquid inlet pipe 211 and a sewage discharge pipe 212, the liquid inlet pipe 211 and the sewage discharge pipe 212 are respectively provided at the left and right sides of the separation tank 2, and the liquid inlet pipe 211 and the liquid discharge pipe 221 are preferably arranged diagonally. The liquid inlet pipe 211 of the separation tank 2 is connected with a liquid conveying pump, liquid is conveyed into the separation tank 2 through the liquid conveying pump, penetrating fluid enters the interior of the filtering membrane 322 and is guided out from the penetrating fluid outlet 3211 through a penetrating fluid channel, and intercepted concentrated liquid is remained outside the filtering membrane 322 and is discharged through a liquid outlet.

In this embodiment, the liquid inlet pipe 211, the sewage pipe 212 and the upper cover 22 are all provided with a pressure detector.

This embodiment still can set up the speed governing unit, through the rotational speed of adjustment membrane filtration unit 32 to satisfy and handle to characteristics such as the different viscosity of material, solid contain, and can handle the sewage of different degrees, application scope is wide.

The device of this embodiment compact structure, appearance size are little, and manufacturing cost is lower, and applicable majority manufacturing enterprise or sewage treatment enterprise satisfy the processing to different types of material or sewage, have obvious considerable economic benefits.

The working process is as follows: the driving motor drives the hollow rotating shaft 321 to rotate through the speed reducer, so that all the filtering membranes 322 are driven to rotate, the liquid inlet pipe 211 of the separation tank 2 is provided with a liquid conveying pump, the liquid conveying pump conveys liquid into the tank body 21, concentrated liquid is discharged through the liquid discharge pipe 221, pressure difference between the inside and the outside of the tank body 21 is caused by the liquid conveying pump or a leachate negative pressure suction pump, and then filtered leachate passes through filtering holes of the filtering membranes 322 and is pressed into the water production channel 3221 and the hollow rotating shaft 321, and finally is led out through a leachate outlet 3211. During, open ultrasonic unit 33, utilize the ultrasonic vibration function, strengthen the unordered degree of torrent, promote the abundant unordered torrent of feed liquid in the jar body 21, weaken filtration membrane 322 surface pollution, ensure filtration membrane 322's filtration efficiency.

In conclusion, the ultrasonic emitter is arranged in the cross flow channel, the ultrasonic emitter can emit ultrasonic waves to the filtering membrane, and disordered turbulence in the accommodating cavity can be changed into more disordered by the ultrasonic waves, so that deposition of particles on the surface of the filtering membrane is effectively reduced, surface pollution of the filtering membrane is delayed, and filtering efficiency and stability of the filtering membrane are improved; the invention can better adapt to the material environment with high concentration, high solid content and high viscosity, and greatly improves the separation and filtration efficiency and performance of the filtration membrane.

Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, and it should be understood that various changes and modifications may be made by those skilled in the art, and any changes, equivalents, improvements and the like, which fall within the spirit and principle of the present invention, should be included in the scope of the present invention.

Claims (10)

1. Rotatory supersound filtration, including holding chamber, rotation driving unit and membrane filtration unit, the membrane filtration unit sets up hold the intracavity, rotation driving unit sets up hold the chamber outside, rotation driving unit drive the membrane filtration unit is rotatory, membrane filtration unit includes cavity rotation axis and two at least filtration membrane, two filtration membrane all sets up on the cavity rotation axis, adjacent two be formed with the cross-flow passageway between the filtration membrane, be provided with the water production passageway in the filtration membrane, be provided with the sepage passageway in the cavity rotation axis, the water production passageway with the sepage passageway intercommunication, its characterized in that:

an ultrasonic unit is further arranged in the accommodating cavity and comprises an ultrasonic transmitter, the ultrasonic transmitter is arranged in the cross flow channel, and the ultrasonic transmitter can transmit ultrasonic waves to the filtering membrane.

2. The rotary ultrasonic filter structure of claim 1, wherein:

the ultrasonic emitters are rod-shaped, the ultrasonic emitters are fixedly arranged between two adjacent filtering membranes, and the filtering membranes can rotate relative to the ultrasonic emitters.

3. The rotary ultrasonic filter structure of claim 2, wherein:

the cross flow channel is provided with an opening at one end far away from the hollow rotating shaft, and the ultrasonic emitter penetrates through the opening from the outward side of the filtering membrane to extend to the inward side of the filtering membrane.

4. A rotary ultrasonic filter structure according to any one of claims 1 to 3, wherein:

the filter membranes are arranged in plurality and are arranged at intervals up and down;

the ultrasonic transmitter is provided with a plurality of, ultrasonic transmitter sets up between two adjacent filtration membranes.

5. The rotary ultrasonic filter structure of claim 4, wherein:

the ultrasonic wave unit still includes the mount pad, the mount pad sets up on the inner wall that holds the chamber, it is a plurality of ultrasonic emitter's stiff end respectively connects all be connected on the mount pad in the axial of cavity rotation axis, it is a plurality of ultrasonic emitter corresponds the setting from top to bottom, perhaps a plurality of ultrasonic emitter dislocation set.

6. The rotary ultrasonic filter structure of claim 4, wherein:

all the filtering membranes are arranged in parallel, and the ultrasonic transmitter and the filtering membranes are arranged in parallel.

7. A rotary ultrasonic filter structure according to any one of claims 1 to 3, wherein:

the filtering membrane is of a disc structure or a disc structure, and is a ceramic membrane, a PVDF membrane, a metal membrane or a soft membrane.

8. Rotatory supersound filter equipment, its characterized in that: the rotary ultrasonic filtering structure comprises a mounting bracket, a separating tank and the rotary ultrasonic filtering structure of any one of claims 1 to 7, wherein the separating tank is arranged on the mounting bracket, a membrane filtering unit of the rotary ultrasonic filtering structure is arranged in the separating tank, a rotary driving unit of the rotary ultrasonic filtering structure is arranged outside the separating tank, an ultrasonic unit of the rotary ultrasonic filtering structure is arranged on the inner wall of the separating tank, and filtering fluid in the separating tank generates disordered turbulence in the rotating process.

9. The rotary ultrasonic filter device of claim 8, wherein:

one end of a hollow rotating shaft of the membrane filtering unit penetrates out of the separation tank, a penetrating fluid outlet is arranged at one end of the hollow rotating shaft penetrating out of the separation tank in a communicating manner, and the penetrating fluid outlet is communicated with a penetrating fluid channel of the hollow rotating shaft.

10. The rotary ultrasonic filter device of claim 8, wherein:

the lower part of the separation tank is provided with a liquid inlet pipe and a sewage discharge pipe, the upper part of the separation tank is provided with a liquid discharge pipe, and the liquid inlet pipe, the sewage discharge pipe and the upper part of the separation tank are respectively provided with a pressure detector.

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