CN203269663U - Self-oscillation micropore aerator - Google Patents

Self-oscillation micropore aerator Download PDF

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Publication number
CN203269663U
CN203269663U CN2013201901858U CN201320190185U CN203269663U CN 203269663 U CN203269663 U CN 203269663U CN 2013201901858 U CN2013201901858 U CN 2013201901858U CN 201320190185 U CN201320190185 U CN 201320190185U CN 203269663 U CN203269663 U CN 203269663U
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China
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self
sustained oscillation
oscillation
spray nozzle
upper spray
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CN2013201901858U
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Chinese (zh)
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孙毅
于江忠
单继宏
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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 utility model discloses a self-oscillation micropore aerator. The self-oscillation micropore aerator comprises a base, a top cover connected to the base and a rubber diaphragm, wherein the top cover is used for pressing the rubber diaphragm on the upper part of the based, and the rubber diaphragm is provided with micropores; the inner cavity at the lower part of the base is an air supplying cavity, the self-oscillation micropore aerator also comprises a self-oscillation structure, and the self-oscillation structure comprises an upper nozzle, a self-oscillation cavity and a lower nozzle; the upper nozzle of the self-oscillation structure is communicated with an air supplying opening, the air supplying opening is communicated with an inlet pipe, the lower nozzle of the self-oscillation cavity is connected with the inlet pipe, the inlet pipe is communicated with an external air source, and the inner diameter of the upper nozzle of the self-oscillation cavity is larger than the inner diameter of the lower nozzle of the self-oscillation cavity. The self-oscillation micropore aerator provided by the utility model has the advantages that the turbulence intensity of an aeration tank is increased, the use ratio of oxygen is improved, and the aeration effect is improved.

Description

The self-sustained oscillation micro-hole aerator
Technical field
The utility model relates to a kind of aerator, especially a kind of micro-hole aerator.
Background technology
In the industrial sewages such as petrochemical industry, printing and dyeing, weaving, papermaking, pharmacy and city domestic sewage biochemical processing process, aerator is owing to providing the required dissolved oxygen of biochemical water treatment extensively to be quoted.
At present common aerator adopts microporous diaphragm aerator, for example application number is 2010101682404 Chinese patent application prospectus, a kind of microporous diaphragm aerator is disclosed, comprise pedestal, be threaded in top cover and rubber diaphragm on pedestal, wherein top cover is compressed on rubber diaphragm on the top of pedestal, has many enclosed micropores in rubber diaphragm.During ventilation, pressurized air enters by pipeline in the pedestal of aerator, and under the effect of air pressure, rubber diaphragm is slightly upwards heaved, and gas never in the air by forming small bubbles, provides dissolved oxygen, to carry out biochemical treatment in treatment tank.In actual applications, due to aeration under certain pressure, cause the stirring in the sewage aeration pond very low, bubble is directly emerged from the top mostly, causes the utilization ratio of oxygen very low.
Summary of the invention
For the deficiency that agitation capability is weak, coefficient of oxygen utilization is lower, the aeration effect is relatively poor that overcomes existing microporous diaphragm aerator, the utility model provides a kind of self-sustained oscillation micro-hole aerator that increases the turbulence intensity of aeration tank, the utilization ratio that improves oxygen, lifting aeration effect.
The technical scheme that its technical problem that solves the utility model adopts is:
a kind of self-sustained oscillation micro-hole aerator, comprise pedestal, be connected to top cover and rubber diaphragm on pedestal, wherein top cover is compressed on rubber diaphragm on the top of pedestal, have micropore in described rubber diaphragm, described pedestal bottom has air feed port, described self-sustained oscillation micro-hole aerator also comprises the self-sustained oscillation structure, described self-sustained oscillation structure comprises upper spray nozzle, the self-excited oscillation cavity and lower nozzle, the upper spray nozzle of described self-sustained oscillation structure is communicated with described air feed port, the lower nozzle of described self-sustained oscillation structure is communicated with inlet pipe, described inlet pipe is communicated with external gas source, the upper spray nozzle internal diameter of described self-sustained oscillation structure is larger than the lower nozzle inside diameter of described self-sustained oscillation structure.
Further, the top of described the self-excited oscillation cavity is provided with the taper impact walls, and described upper spray nozzle is positioned at the middle part of described taper impact walls.This taper impact walls is conducive to air-flow and forms collar vortex in the self-excited oscillation cavity; Certainly, the cross-sectional shape of impact walls also can be other shapes, such as trilateral etc., as long as external diameter is up big and down small.
Further, along described upper spray nozzle from top to bottom, it is large that the external diameter of described taper impact walls becomes gradually.The collar vortex effect of this mode is comparatively desirable, can make only to produce a pair of collar vortex along the axis symmetry in the self-excited oscillation cavity, makes the collar vortex structure more reasonable, air-flow is produced stable, and periodic exciting has obvious primary band, makes the exciting pulsatile effect best.Certainly, also can adopt other modes.
Further again, the internal diameter of described inlet pipe is along changing from small to big gradually away from described self-sustained oscillation cavity direction.In inlet pipe, air-flow is accelerated, also be conducive to promote turbulent effect.
The medullary ray of described upper spray nozzle and described lower nozzle is located along the same line, and to reduce the aeration process power loss, reduces aeration energy consumption.
Technical conceive of the present utility model is: this micro-hole aerator is provided with oscillating structure, the pressurized air of being carried by pipeline reaches certain pressure and flow velocity, when gaseous tension and flow velocity reach certain numerical value, gas is through oscillating structure, and can make and be sent to the mobile of microporous membrane by micro-pore aeration pallet internal space is time dependent Transient Flow.This flow exists the capable ripple of pressure, makes the air-flow that reaches microporous membrane that to a certain degree pulsation be arranged, and then makes bubble velocity that common micro-hole aerator overflows that to a certain degree difference be arranged, and further makes current present the state of strong turbulent flow.When pressurized air passes into vibration during the chamber through entrance, between chamber inner fluid and the pressurized air that enters, momentum exchange occurs, form certain thickness unstable shear layer, shear layer is carried secretly generation whirlpool, propagates down stream by jet.When arriving the downstream impact walls together with the vortex of the pressurized air with initial vibration and continuous generation, bring out the pressure disturbance ripple of certain frequency in the impact zone.At a high speed upstream to reflex to chamber entrance, when the frequency of this disturbance wave frequency and jet initial vibration be close, by superposition amplified again by the vibration of whole fluid for this perturbation wave.Repeat said process, the oscillating jet that has namely occurred modulated in the chamber exit.The cylindrical vibration chamber of self-sustained oscillation micro-hole aerator plays a part the simple harmonic device.When the vortex wave frequency of injecting the compressed-air actuated frequency of chamber and chamber structure, geometrical dimension decision is close, air produces resonance, amplitude is exaggerated, and propagate to outlet together, with compressed-air actuated steady state pressure and this two kinds of oscillating pressure superpositions, the mathematical model that can draw self-sustained oscillation micro-hole aerator flowing pressure in chamber is:
p＝p 0+p Acos k ax+p Bcos k vx (1)
In formula:
Figure DEST_PATH_GDA00003567860300031
Figure DEST_PATH_GDA00003567860300032
p 0Be steady state pressure; Be row wave pressure amplitude;
Figure DEST_PATH_GDA00003567860300034
Be vorticity wave pressure amplitude;
The mathematical model of chamber inner fluid velocity of wave motion is:
v＝v 0+v Asin k ax+v Bsin k vx （2）
In formula,
Figure DEST_PATH_GDA00003567860300035
The amplitude of expression row ripple V-bar;
Figure DEST_PATH_GDA00003567860300036
The amplitude of expression vorticity wave V-bar;
Figure DEST_PATH_GDA00003567860300037
Incoming flow velocity of wave motion during stable state; c 1Inner fluid velocity of wave motion in chamber during stable state; k sAdiabatic bulk modulus; k aThe wave number of row ripple; k vThe wave number of vorticity wave.
The beneficial effects of the utility model are mainly manifested in: increase the turbulence intensity of aeration tank, the utilization ratio that improves oxygen, lifting aeration effect.
Description of drawings
Fig. 1 is the structural representation of self-sustained oscillation micro-hole aerator.
Fig. 2 is the vibration cavity configuration.
Fig. 3 is the mechanism of production schematic diagram of self-sustained oscillation effect.
Fig. 4 is for flowing out the gas velocity schematic diagram in vibration chamber.
Fig. 5 is the self-excited oscillation cavity and lower nozzle segment schematic diagram.
Fig. 6 is taper impact walls and upper spray nozzle part schematic diagram.
Fig. 7 is the pedestal schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
with reference to Fig. 1～Fig. 7, a kind of self-sustained oscillation micro-hole aerator, comprise pedestal 1, be connected to top cover 2 and rubber diaphragm 3 on pedestal, wherein top cover 2 is compressed on rubber diaphragm on the top of pedestal 1, have micropore in described rubber diaphragm 3, described pedestal 1 bottom has air feed port, described self-sustained oscillation micro-hole aerator also comprises the self-sustained oscillation structure, described self-sustained oscillation structure comprises upper spray nozzle 5, the self-excited oscillation cavity 4 and lower nozzle 6, the upper spray nozzle 5 of described self-sustained oscillation structure is communicated with described air feed port, the lower nozzle 6 of described self-sustained oscillation structure is communicated with inlet pipe, described inlet pipe is communicated with external gas source, the upper spray nozzle internal diameter of described self-sustained oscillation structure is larger than the lower nozzle inside diameter of described self-sustained oscillation structure.
Further, the top of described the self-excited oscillation cavity 4 is provided with taper impact walls 7, and described upper spray nozzle is positioned at the middle part of described taper impact walls 7.This taper impact walls 7 is conducive to air-flow and forms collar vortex at the self-excited oscillation cavity; Certainly, the cross-sectional shape of impact walls also can be other shapes, such as trilateral etc., as long as external diameter is up big and down small.
Further, along described upper spray nozzle from top to bottom, it is large that the external diameter of described taper impact walls 5 becomes gradually.The collar vortex effect of this mode is comparatively desirable, can make only to produce a pair of collar vortex along the axis symmetry in the self-excited oscillation cavity, makes the collar vortex structure more reasonable, air-flow is produced stable, and periodic exciting has obvious primary band, makes the exciting pulsatile effect best.Certainly, also can adopt other modes.
Further again, the internal diameter of described inlet pipe is along changing from small to big gradually away from described self-sustained oscillation cavity direction.In inlet pipe, air-flow is accelerated, also be conducive to promote turbulent effect.
The medullary ray of described upper spray nozzle and described lower nozzle is located along the same line.To reduce the aeration process power loss, reduce aeration energy consumption.
In the present embodiment, when pressurized air flows out in the process of upper spray nozzle through lower nozzle, velocity variations occurs in gas in the chamber that vibrates, the gas velocity that flows out at last upper spray nozzle is variant, and then the degree that gas is heaved rubber diaphragm is different, and the Air Bubble Size that overflows on the one hand is variant, causes on the other hand bubble to produce gap at the flow velocity of water, make the larger agitaion of water generates, increase the content of dissolved oxygen.
The vibration chamber of the present embodiment produces the principle of vibration: when upper spray nozzle flowed into the rotational symmetry chamber, vibration had been full of stationary fluid in the chamber when one jet or shear flow, and jet produces Turbulent Mixing with stationary fluid on every side.Produce strong momentum exchange, form along the turbulent shear layer that flows to progressive additive, because jet speed is large, shear layer is burble shear layer and is unsettled; Therefore the fluid around shear layer is carried secretly and is produced vortex, because shear layer is axisymmetric, therefore vortex exists and moves with the form symmetry of collar vortex.The disengaging zone near the intersection of shear layer and inactive liquid, namely flowing distributes from the frictional belt turns to shear layer to distribute, there is velocity slope very large and unsettled zone in shear layer, orderly macrostructure vortex will be induced, vorticity disturbance in fluid in the certain frequency scope is amplified, form a succession of discrete collar vortex in shear layer, because shear layer is axisymmetric, the collar vortex that therefore forms is also symmetrical along the chamber axle center.When it moves downstream, bump with the downstream impact walls, produce certain pressure disturbance ripple in the impact zone, this pressure disturbance ripple is upstream propagated with wave velocity.Near the arrival upper spray nozzle initially-separate district.And the disengaging zone is quite responsive to disturbance, can bring out again new vorticity pulsation, because the shear layer unstable has optionally amplification to disturbance, when mixed turbulent carried as side-arm flowed to the vorticity pulsation of propagating in the downstream and satisfies it amplify condition in shear layer, this disturbance just was amplified in shear layer.Disturbance after amplification bumps with impact walls again, constantly repeats again said process.Thereby cause the significantly laterally pulsation of impact zone shear layer, involve fluid core, cause chamber exit fluid impedance periodical change, thereby play the effect of modulation flow, produce self-sustained oscillation.
According to fluid mechanics principle, set the upper spray nozzle diameter, the self-excited oscillation cavity chamber diameter and chamber length, lower nozzle diameter, the numerical value at the pitch angle of taper impact walls can produce a pair of collar vortex along the axis symmetry in the self-excited oscillation cavity, make the collar vortex structure more reasonable, air-flow is produced stable, periodic exciting has obvious primary band, makes pulsatile effect best, further make Minimal energy loss in aeration process, can produce maximum energy output.
The making processes of the self-sustained oscillation micro-hole aerator of the present embodiment is about to it and is divided into three parts processing as shown in Fig. 5,6,7, and first part is according to making shown in Figure 5, wherein, the self-excited oscillation cavity and lower nozzle segment, there are internal thread and outside screw in its upper end; Second section is according to making shown in Figure 6, taper impact walls and upper spray nozzle part, and taper impact walls end has outside screw, with the convenient and internal thread engagement the self-excited oscillation cavity upper end, consists of self-excitation self-sustained oscillation structure; Third part is according to making base construction shown in Figure 7, and there is internal thread the lower end of pedestal, to be convenient to the engagement of the self-excited oscillation cavity upper external screw thread, consists of base construction; Then first part, second section and third part assembling are formed the self-sustained oscillation micro-hole aerator.

Claims (5)

1. self-sustained oscillation micro-hole aerator, comprise pedestal, be connected to top cover and rubber diaphragm on pedestal, wherein top cover is compressed on rubber diaphragm on the top of pedestal, have micropore in described rubber diaphragm, described pedestal bottom has air feed port, it is characterized in that: described self-sustained oscillation micro-hole aerator also comprises the self-sustained oscillation structure, described self-sustained oscillation structure comprises upper spray nozzle, the self-excited oscillation cavity and lower nozzle, the upper spray nozzle of described self-sustained oscillation structure is communicated with described air feed port, the lower nozzle of described self-sustained oscillation structure is communicated with inlet pipe, described inlet pipe is communicated with external gas source, the upper spray nozzle internal diameter of described self-sustained oscillation structure is larger than the lower nozzle inside diameter of described self-sustained oscillation structure.
2. self-sustained oscillation micro-hole aerator as claimed in claim 1, it is characterized in that: described self-sustained oscillation top of chamber is provided with the taper impact walls, and described upper spray nozzle is positioned at the middle part of described taper impact walls.
3. self-sustained oscillation micro-hole aerator as claimed in claim 2, it is characterized in that: along described upper spray nozzle from top to bottom, it is large that the external diameter of described taper impact walls becomes gradually.
4. self-sustained oscillation micro-hole aerator as described in one of claim 1～3, it is characterized in that: the internal diameter of described inlet pipe is along changing from small to big gradually away from described self-sustained oscillation cavity direction.
5. self-sustained oscillation micro-hole aerator as described in one of claim 1～3, it is characterized in that: the medullary ray of described upper spray nozzle and described lower nozzle is located along the same line.
CN2013201901858U 2013-04-15 2013-04-15 Self-oscillation micropore aerator Expired - Fee Related CN203269663U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103253761A (en) * 2013-04-15 2013-08-21 浙江工业大学 Self-oscillation micropore aerator
CN107935165A (en) * 2017-12-22 2018-04-20 苏州清然环保科技有限公司 Aerator and the wastewater treatment equipment with the aerator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103253761A (en) * 2013-04-15 2013-08-21 浙江工业大学 Self-oscillation micropore aerator
CN107935165A (en) * 2017-12-22 2018-04-20 苏州清然环保科技有限公司 Aerator and the wastewater treatment equipment with the aerator
CN107935165B (en) * 2017-12-22 2024-01-19 苏州清然环保科技有限公司 Aeration device and wastewater treatment device with same

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Granted publication date: 20131106

Termination date: 20190415