CN102716827B - Gas-liquid two-phase pressure-balanced wide-angle uniformly-distributed mist nozzle - Google Patents
Gas-liquid two-phase pressure-balanced wide-angle uniformly-distributed mist nozzle Download PDFInfo
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- CN102716827B CN102716827B CN201210236501.0A CN201210236501A CN102716827B CN 102716827 B CN102716827 B CN 102716827B CN 201210236501 A CN201210236501 A CN 201210236501A CN 102716827 B CN102716827 B CN 102716827B
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Abstract
The invention discloses a gas-liquid two-phase pressure-balanced wide-angle uniformly-distributed mist nozzle. The gas-liquid two-phase pressure-balanced wide-angle uniformly-distributed mist nozzle comprises a nozzle shell and a Venturi ejector, wherein the nozzle shell is provided with a liquid inlet pipe and a gas inlet pipe; the a Venturi ejector is formed by a Venturi rotating body and a spiral groove type inner core and is fixedly embedded in an inner cavity of the nozzle shell; the spiral groove type inner core is fixedly inserted in a middle cavity of the Venturi rotating body; the Venturi rotating body is provided with a ring-shaped pressure equalizing chamber which is communicated with the liquid inlet pipe; a liquid discharging ring seam is formed on the inner side of the ring-shaped pressure equalizing chamber; a ring-shaped reducing section, a ring-shaped throat pipe section and a ring-shaped divergent section are sequentially formed between the spiral groove type inner core and the Venturi rotating body from inside to outside; the ring-shaped reducing section is communicated with the gas inlet pipe; the ring-shaped throat pipe section is communicated with the liquid discharging ring seam; and the ring-shaped divergent section is communicated with the outside. The gas-liquid two-phase pressure-balanced wide-angle uniformly-distributed mist nozzle disclosed by the invention has the advantages of simple structure, good atomizing distribution uniformity, wide ejection area and the like.
Description
Technical field
The biphase gas and liquid flow atomizer that the present invention relates to be applicable to the fields such as clarifying smoke, desulphurization denitration, gas cooling, spraying and fire-fighting, refers in particular to the uniform mist nozzle of a kind of gas-liquid two-phase pressure balanced wide-angle.
Technical background
Atomizer has two kinds: single liquid atomizing nozzle and gas-liquid two-phase atomizer.
The atomization mechanism of single liquid atomizing nozzle is mainly mitoschisis, and liquid penetrates from spray orifice with very high speed, and under the frictional force effect between surface tension and liquid and extraneous still air, fluid column becomes the brin of snake shape vibration, and mist formation then ruptures.The atomizing effect of single liquid atomizing nozzle is poor, if produce the droplet that average diameter is less than 100 microns, must adopt little spray orifice, high hydraulic pressure, and the problem that single liquid atomizing nozzle of this structure exists is: aperture is easily stopped up, and atomization quality is poor.
Gas-liquid two-phase atomizer is mainly to adopt compressed air to impact liquid stream to improve atomization quality, significantly reduces hydraulic pressure.Because gas-liquid two-phase atomizer has better atomization than single liquid atomizing nozzle, therefore, gas-liquid two-phase atomizer obtains using more and more widely.
The atomization mechanism of gas-liquid two-phase atomizer is mainly membranaceous division, when gas-liquid mixed stream sprays from pressure nozzle with quite high speed, can form the film-form droplet group of gas-in-liquid, gas expansion makes liquid-sheet disintegration mist formation, increase air pressure, reduce liquid measure and can further improve atomizing effect.Gas-liquid two-phase atomizer has two kinds of patterns: ejection type and gas-liquid collision type.
The required hydraulic pressure of ejection type nozzle is extremely low, can be normal pressure (ambient atmosphere pressure), and the negative pressure that only depends on high velocity air to produce in Venturi tube throat just may suck liquid in Venturi tube, makes gas-liquid mixed formation droplet.The subject matter that ejection type nozzle exists is that atomization quality is unstable, and reason has two kinds:
The one, liquid can not suck ejection type nozzle to be caused forming liquid mist: according to the Diffusion Law of gas jet, when larynx mouth distance is excessive, gas jet sectional area had been diffused into and has been greater than trunnion area before entering trunnion, trunnion becomes simple resistance to jet, thereby makes injector can not form liquid mist by pumping liquid.In addition, flow type pump with injection gas sprays and has air velocity lower limit.If spout gas speed is lower than lower limit, the negative pressure producing is inadequate, liquid cannot inhalation spray head, can not form liquid mist (referring to Wu Weifeng, Feng Quanke, to the Qingjian River, Lv Junxian.Two phase flow pattern analysis in gas-liquid ejector.Nuclear Power Engineering.2007，28（6），34-37）。
The 2nd, the backflow effect in mixing chamber causes normally spraying: between gas spout and Venturi tube, be gas-liquid mixed chamber, the outside, high-speed jet district that gas spout produces is recirculating zone, recirculating zone is along with the rising of back pressure is constantly moved to mixing chamber inlet place, when back pressure surpasses to a certain degree, will there is serious backflow phenomenon in porch, cause ejection type nozzle operation to stop (referring to Wang Houqing, Shen Chao, Wang Xiaojuan, Chen Ping Lu, Zhang Hefei.The numerical simulation of biphase gas and liquid flow injector and experimental study.Petroleum machinery.2005，33（9），21-23）。
Gas-liquid collision type nozzle mainly produces atomization by the mutual collision between high-speed gas-liquid, and gas-liquid collision type nozzle has good atomization stability, but also has weak point:
1, liquid phase spout easily stops up.Because gas-liquid collision type nozzle is to produce atomization by the mutual collision between high-speed gas-liquid, therefore just require the diameter of liquid phase spout very little (being conventionally less than 1mm), make hydrojet become very thin fluid column, so just easily under the impact of high velocity air broken mist formation (referring to Yang Lijun, Wang Wei.The research of two phase flow emulsifying mist-generating nozzle atomization characteristics, BJ University of Aeronautics & Astronautics's journal, 2002,28(4), 413-416).If liquid has impurity (as wet desulphurization spray alkali lye has solid particle, oil spray has grease etc.), thin spout very easily stops up.
2, gas-liquid two-phase atomizing is not not fully exerted.Collision type nozzle only has the mutual collision effect between high-speed gas-liquid, does not utilize the shearing force between biphase gas and liquid flow.
3, the required hydraulic pressure of gas-liquid collision type nozzle is higher than ejection type nozzle.
In order to overcome the unsettled problem of ejection type nozzle atomization quality, effectively bring into play the atomization potentiality of gas-liquid collision type nozzle simultaneously, Chinese invention patent ZL 2,009 1 0063156.3, a kind of employing backspin compressed air stream is disclosed, and utilize the percussion of high velocity air to fluid column, shear action in conjunction with High Rotation Speed air-flow to fluid column, thus make the more easily broken liquid mist that forms of fluid column.Although two-phase whirl heavy calibre mist nozzle has greatly improved atomizing effect, still have and exist with defect:
1, required hydraulic pressure higher (being conventionally greater than 0.2MPa).
2, due to the pressure on air-flow and liquid contact surface not etc., cause nozzle end each spray orifice ejection liquid measure not etc.
3, for all jet roses, no matter be porous list liquid atomizing nozzle or porous gas-liquid two-phase atomizer, between two strands of dispersed jets, always there is the phenomenon of spraying distribution inequality, up to the present this problem is not also solved well.
Summary of the invention
Object of the present invention will overcome above-mentioned technological deficiency exactly, and the uniform mist nozzle of gas-liquid two-phase pressure balanced wide-angle that a kind of atomization distributing homogeneity is good, simple in structure and can not occur to stop up is provided.
For achieving the above object, the uniform mist nozzle of gas-liquid two-phase pressure balanced wide-angle that the present invention is designed, comprise nozzle body, on described nozzle body, be provided with feed tube and air inlet pipe, also comprise the venturi-type eductors being formed by venturi revolving body and spiral groove type inner core, described venturi revolving body is set in the inner chamber that is fixed on nozzle body, and described spiral groove type inner core inserts and is fixed in the middle cavity of venturi revolving body; On described venturi revolving body, be provided with the equal pressure chamber of ring-type, the equal pressure chamber of described ring-type is connected with feed tube, and the inner side of the equal pressure chamber of described ring-type offers fluid circumferential weld; Between described spiral groove type inner core and venturi revolving body, form successively from the inside to the outside ring-type converging transition, ring-type trunnion section and the ring-type divergent segment of venturi-type eductors, described ring-type converging transition communicates with air inlet pipe, described ring-type trunnion section communicates with fluid circumferential weld, and described ring-type divergent segment communicates with the external world.
In technique scheme, the equal pressure chamber of described ring-type is enclosed and is formed by the cylinder inner wall of the annular groove on venturi revolving body and nozzle body.
In technique scheme, described spiral groove type inner core comprises inner side conical section, middle screw shell of column and outside frustum section; Described venturi revolving body comprises inner side inversed conical drum section, middle cylinder section and outside conical cylinder section; Between described inner side conical section and inner side inversed conical drum section, form ring-type converging transition, between described middle screw shell of column and middle cylinder section, form ring-type trunnion section, between described outside frustum section and outside conical cylinder section, form ring-type divergent segment.
In technique scheme, described nozzle body is formed by conical cylinder section housing and cylindrical section shell combination, described air inlet pipe is arranged on the top of conical cylinder section housing, and described venturi revolving body is set in the inner chamber that is fixed on cylindrical section housing, and described feed tube is arranged on the sidewall of cylindrical section housing.
In technique scheme, the axial line of described spiral groove type inner core overlaps with the axial line of air inlet pipe, vertical with the axial line of feed tube, and three's axial line is positioned at same plane.
The present invention adopts technique scheme, has following remarkable technological progress and beneficial effect:
1, the effect of venturi ejection atomization is combined with fluid dynamic rotary-cut atomizing, on the one hand, utilize the high velocity air negative-pressure liquid suction effect of ejection type nozzle, effectively reduce liquid supply pressure, utilize the negative-pressure ejecting effect of high velocity air in venturi-type eductors, the liquid in the equal pressure chamber of ring-type is drawn in spiral grooves by feed liquor circumferential weld, make liquid stream and high velocity air mixed aerosol, therefore required hydraulic pressure is normal pressure or low pressure, has energy-saving effect; On the other hand, utilize the impact rotary-cut effect of gas-liquid swirl nozzle, make the atomization of liquid more abundant, the droplet footpath of generation is less.
2, feed tube of the present invention communicates with the equal pressure chamber of ring-type, the equal pressure chamber of ring-type is large section ring-shaped cavity, because the basal area of the equal pressure chamber of ring-type is far longer than the basal area of feed liquor circumferential weld, so the whole gas-liquid circumference contact-making surface upward pressure in circumferential weld import department equates, the flow that liquid is flowed into each spiral grooves from feed liquor circumferential weld is identical, according to pressure balanced principle, pressure on whole annular circumferential gas-liquid contact face between the equal pressure chamber of ring-type and feed liquor circumferential weld equates everywhere, efficiently solve inlet hydraulic imbalance problem, improved spraying uniformity.
3, the trunnion section of venturi-type eductors adopts spiral grooves design, utilizes the high speed rotary-cut atomizing of air-flow in groove, and liquid is flowed to shearing-crushing, makes the liquid atomization, and atomizing effect is good.
4, liquid mist of the present invention is the ring-type flaring horn mouth ejection from venturi-type eductors end, bell-mouthed passage is very wide, effectively avoided the phenomenon of stopping up, and the liquid mist form of ejection is rotation umbrella, improved the atomization uniformity in whole 360 ° of angular regions.
5, in the parts that nozzle of the present invention forms, nozzle body, venturi revolving body and spiral groove type inner core are convolution circulus, and processing and fabricating is simple, easy for installation.
Accompanying drawing explanation
Fig. 1 is the sectional structure chart of the uniform mist nozzle of a kind of gas-liquid two-phase pressure balanced wide-angle;
Fig. 2 is that the A-A of Fig. 1 is to view;
Fig. 3 is the structural representation of spiral groove type inner core in Fig. 1;
In figure, feed tube 1; The equal pressure chamber 2 of ring-type; Feed liquor circumferential weld 3; Air inlet pipe 4; Nozzle body 5(is wherein: conical section housing 5.1, cylindrical section housing 5.2); Ring-type converging transition 6; Ring-type trunnion section 7; Ring-type divergent segment 8; Spiral groove type inner core 9(is wherein: inner side conical section 9.1, middle screw shell of column 9.2, outside frustum section 9.3); Venturi revolving body 10(is wherein: inner side inversed conical drum section 10.1, middle cylinder section 10.2, outside conical cylinder section 10.3).
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
The uniform mist nozzle of gas-liquid two-phase pressure balanced wide-angle shown in figure, comprise nozzle body 5, on nozzle body 5, be provided with feed tube 1 and air inlet pipe 4, also comprise the venturi-type eductors being formed by venturi revolving body 10 and spiral groove type inner core 9, venturi revolving body 10 is set in the inner chamber that is fixed on nozzle body 5, and spiral groove type inner core 9 inserts and is fixed in the middle cavity of venturi revolving body 10; On venturi revolving body 10, be provided with the equal pressure chamber 2 of ring-type, the equal pressure chamber 2 of ring-type is connected with feed tube 1, and the inner side of the equal pressure chamber 2 of ring-type offers fluid circumferential weld 3; Between spiral groove type inner core 9 and venturi revolving body 10, form successively from the inside to the outside ring-type converging transition 6, ring-type trunnion section 7 and the ring-type divergent segment 8 of venturi-type eductors, ring-type converging transition 6 communicates with air inlet pipe 4, ring-type trunnion section 7 communicates with fluid circumferential weld 3, and ring-type divergent segment 8 communicates with the external world.
Particularly, the equal pressure chamber 2 of ring-type is enclosed and is formed by the cylinder inner wall of the annular groove on venturi revolving body 10 and nozzle body 5.Spiral groove type inner core 9 comprises inner side conical section 9.1, middle screw shell of column 9.2 and outside frustum section 9.3; Corresponding with the three-stage structure of spiral groove type inner core 9, venturi revolving body 10 is also provided with three-stage structure, comprises inner side inversed conical drum section 10.1, middle cylinder section 10.2 and outside conical cylinder section 10.3.Between inner side conical section 9.1 and inner side inversed conical drum section 10.1, form ring-type converging transition 6, between middle screw shell of column 9.2 and middle cylinder section 10.2, form ring-type trunnion section 7, between outside frustum section 9.3 and outside conical cylinder section 10.3, form ring-type divergent segment 8.On the outer surface of middle screw shell of column 9.2, be distributed with spiral grooves, between spiral grooves and the equal pressure chamber 2 of ring-type, by feed liquor circumferential weld 3, communicating, is stationary fit between spiral grooves and venturi revolving body 10, particularly, the inwall spot welding of spiral grooves and venturi revolving body 10, structure is more stable.
In the present embodiment, the axial line of spiral groove type inner core 9 overlaps with the axial line of air inlet pipe 4, vertical with the axial line of feed tube 1, and three's axial line is positioned at same plane, so not only makes air-flow and liquid stream comparatively unobstructed, and is convenient to machining.
In the present embodiment, nozzle body 5 is combined by conical cylinder section housing 5.1 and cylindrical section housing 5.2, air inlet pipe 4 is welded on the top of conical cylinder section housing 5.1, and venturi revolving body 10 is set in the inner chamber that is fixed on cylindrical section housing 5.2, and feed tube 1 is welded on the sidewall of cylindrical section housing 5.2.
Operation principle of the present invention is:
Feed tube 1 is communicated with normal pressure water source by plastic tube, and air inlet pipe 4 is connected with the compressed air stream feeder of 0.2MPa-0.4MPa by plastic tube.Water flows into the equal pressure chamber 2 of ring-type by feed tube 1, when compressed air stream enters venturi nozzle ring-type converging transition 6 along air inlet pipe 4, air-flow accelerates gradually, and when air-flow enters ring-type trunnion section 7, flow velocity reaches maximum, and air-flow is along the spiral grooves flow at high speed on spiral groove type inner core 9 circumference.The high negative pressure that high velocity air produces by the liquid in the equal pressure chamber 2 of ring-type along feed liquor circumferential weld 3 even suctions in spiral grooves, when high velocity air and liquid stream meets in spiral grooves, high velocity air is to raw strong impact and the rotary-cut effect of liquid miscarriage, liquid is flowed to broken atomization, form gas-liquid mixed stream.Subsequently, it is horn mouth that gas-liquid mixed stream flow into ring-type divergent segment 8(along spiral grooves), the further expansion atomization in ring-type divergent segment 8 of gas-liquid mixed stream.Finally, liquid mist, from 8 ejections of ring-type divergent segment, forms the equally distributed mist of wide-angle.
Claims (4)
1. the uniform mist nozzle of gas-liquid two-phase pressure balanced wide-angle, comprises nozzle body (5), is provided with feed tube (1) and air inlet pipe (4) on described nozzle body (5), it is characterized in that:
Also comprise the venturi-type eductors being formed by venturi revolving body (10) and spiral groove type inner core (9), described venturi revolving body (10) is set in the inner chamber that is fixed on nozzle body (5), and described spiral groove type inner core (9) inserts and is fixed in the middle cavity of venturi revolving body (10);
On described venturi revolving body (10), be provided with the equal pressure chamber of ring-type (2), the equal pressure chamber of described ring-type (2) is connected with feed tube (1), and the inner side of the equal pressure chamber of described ring-type (2) offers fluid circumferential weld (3);
Between described spiral groove type inner core (9) and venturi revolving body (10), form successively from the inside to the outside ring-type converging transition (6), ring-type trunnion section (7) and the ring-type divergent segment (8) of venturi-type eductors, described ring-type converging transition (6) communicates with air inlet pipe (4), described ring-type trunnion section (7) communicates with fluid circumferential weld (3), and described ring-type divergent segment (8) communicates with the external world;
Described spiral groove type inner core (9) comprises inner side conical section (9.1), middle screw shell of column (9.2) and outside frustum section (9.3); Described venturi revolving body (10) comprises inner side inversed conical drum section (10.1), middle cylinder section (10.2) and outside conical cylinder section (10.3); Between described inner side conical section (9.1) and inner side inversed conical drum section (10.1), form ring-type converging transition (6), between described middle screw shell of column (9.2) and middle cylinder section (10.2), form ring-type trunnion section (7), between described outside frustum section (9.3) and outside conical cylinder section (10.3), form ring-type divergent segment (8).
2. the uniform mist nozzle of gas-liquid two-phase pressure balanced wide-angle according to claim 1, is characterized in that: the equal pressure chamber of described ring-type (2) is enclosed and formed by the cylinder inner wall of the annular groove on venturi revolving body (10) and nozzle body (5).
3. the uniform mist nozzle of gas-liquid two-phase pressure balanced wide-angle according to claim 1 and 2, it is characterized in that: described nozzle body (5) is combined by conical cylinder section housing (5.1) and cylindrical section housing (5.2), described air inlet pipe (4) is arranged on the top of conical cylinder section housing (5.1), described venturi revolving body (10) is set in the inner chamber that is fixed on cylindrical section housing (5.2), and described feed tube (1) is arranged on the sidewall of cylindrical section housing (5.2).
4. the uniform mist nozzle of gas-liquid two-phase pressure balanced wide-angle according to claim 1 and 2, it is characterized in that: the axial line of described spiral groove type inner core (9) overlaps with the axial line of air inlet pipe (4), vertical with the axial line of feed tube (1), and three's axial line is positioned at same plane.
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| CN201210236501.0A CN102716827B (en) | 2012-07-10 | 2012-07-10 | Gas-liquid two-phase pressure-balanced wide-angle uniformly-distributed mist nozzle |
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| CN201210236501.0A CN102716827B (en) | 2012-07-10 | 2012-07-10 | Gas-liquid two-phase pressure-balanced wide-angle uniformly-distributed mist nozzle |
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| CN102716827B true CN102716827B (en) | 2014-11-26 |
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| RU2804549C1 (en) * | 2022-12-06 | 2023-10-02 | Федеральное государственное бюджетное учреждение науки "Институт теплофизики им. С.С. Кутателадзе" Сибирского отделения Российской академии наук | Pneumatic nozzle |
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| CN1007409B (en) * | 1987-03-02 | 1990-04-04 | 莱奇勒有限公司 | Binary atomizing jet-nozzle for generating full coniform efflux |
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| RU2804549C1 (en) * | 2022-12-06 | 2023-10-02 | Федеральное государственное бюджетное учреждение науки "Институт теплофизики им. С.С. Кутателадзе" Сибирского отделения Российской академии наук | Pneumatic nozzle |
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