EP1986788A1 - Zweistoffdüse mit kreisförmig angeordneten sekundärluftdüsen - Google Patents
Zweistoffdüse mit kreisförmig angeordneten sekundärluftdüsenInfo
- Publication number
- EP1986788A1 EP1986788A1 EP07703511A EP07703511A EP1986788A1 EP 1986788 A1 EP1986788 A1 EP 1986788A1 EP 07703511 A EP07703511 A EP 07703511A EP 07703511 A EP07703511 A EP 07703511A EP 1986788 A1 EP1986788 A1 EP 1986788A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- secondary air
- air nozzles
- mixing chamber
- mouth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
- B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
- B05B7/0458—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber the gas and liquid flows being perpendicular just upstream the mixing chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
- B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
- B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
Definitions
- the invention relates to a two-fluid nozzle with a main nozzle, with a mixing chamber and a nozzle connected to the mixing chamber and arranged downstream of the mixing chamber.
- FIG. 1 shows, by way of example, a two-fluid nozzle 3 according to the prior art, which is essentially symmetrical with respect to the axis 24.
- the liquid to be sprayed 1 is introduced via a central lance tube 2 at the constriction 10 in the mixing chamber 7.
- the compressed gas 15 is supplied via an outer lance tube 4 of an annular chamber 6, which surrounds the mixing chamber in an annular manner; over a certain number of holes 5, the compressed gas is introduced into the mixing chamber 7.
- a first division of the liquid takes place in drops, so that here a drop-containing gas 9 is formed.
- a divergent outlet part 26 connects, which ends with the nozzle orifice 8.
- the droplet-containing gas stream 9 formed in the mixing chamber 7 is greatly accelerated in the convergent-divergent nozzle, also called valving nozzle, so that a further division of the droplets is effected here.
- Two-substance nozzles with a single exit bore of conventional design suffer from the property that the jet 21 emerging from the nozzle of droplets and atomizing air has only a small opening angle ⁇ . This has the consequence that relatively large distances or large containers are required for the drop evaporation.
- liquid films on walls can still exist as stable films without dripping even if the gas flow which drives the liquid film to the nozzle orifice, supersonic reached speed. And this is also the reason why it is possible to use liquid film cooling in rocket thrusters.
- the film flow is particularly critical in the spraying of highly viscous liquids which simultaneously have a high surface tension, for example of glycol in refrigeration dryers of natural gas pumping stations or of solid suspensions in spray absorbers.
- the liquid films which are driven by the gas flow to the nozzle orifice 8, can even roam around a sharp edge on the nozzle orifice due to the adhesive forces; they then form a water bead 12 on the outside of the nozzle mouth, see FIG. 1.
- Edge drops 13 detach from this water bead whose diameter is a multiple of the mean droplet diameter in the jet core. Although these large edge drops contribute only a small mass fraction to the total drop freight, they are ultimately determining the dimensions of the container in which, for example, the temperature of a gas by evaporative cooling from 350 0 C to 120 0 C is lowered, without causing an entry of Drops come in downstream components such as blowers or fabric filters.
- Fig. 2 shows a corresponding two-fluid nozzle with annular gap atomization.
- the annular gap air also referred to here as secondary air, is branched off via bores 19 directly from the annular chamber 6. But even this type of nozzle suffers from the property to produce a relatively slender beam 21, with an opening angle ⁇ of about 15 °.
- Compressed gas exits the annular gap 16 at high speed and ensures that a liquid film on the wall of the nozzle mouth, in particular of the divergent outlet section, is drawn out to a very thin liquid lamella, which then decays into small drops.
- the annular gap air amount may be, for example, 10% to 40% of the total atomizing air amount.
- the total pressure of the air in the annular gap is advantageously 1, 5 bar to 2.5 bar absolute.
- the total pressure of the air in the annular gap is advantageously so high that when it is expanded to the pressure level in the container, approximately sound velocity is achieved.
- the outlet opening is formed by means of a peripheral wall, whose extreme end forms an outlet edge and the annular gap is arranged in the region of the outlet edge.
- the annular gap between the exit edge and an outer annular gap wall is formed.
- the annular gap wall edge is arranged after the trailing edge.
- the annular gap wall edge is arranged between 5% and 20% of the diameter of the outlet opening to the outlet edge.
- a pressure of the compressed gas supplied to the annular gap and a pressure of the compressed gas opening into the mixing chamber through the compressed gas inlet can be set independently of one another.
- the inlet bores 5 into the mixing chamber may be tangential to a circle about a central longitudinal axis of the nozzle. tet to create a spin in a first direction.
- Multiple inlet bores may be provided spaced from each other, and different inlet bores may be tangentially aligned to produce a twist in different directions, for example, opposing twist directions.
- non-prepublished patent application 10 2006 001 319.0 describes a two-substance nozzle for wall-mounted installation in which, to avoid wall coverings, an envelope, barrier or veiling air nozzle and the wall area in the vicinity of the nozzle are heated.
- the nozzle described therein is designed analogously to the two-component nozzle according to DE 10 2005 048 489.1.
- a two-fluid nozzle is to be provided with which a large opening angle of the spray jet can be achieved.
- a two-substance nozzle with a main nozzle, with a mixing chamber and a nozzle mouth connected to the mixing chamber and arranged downstream of the mixing chamber is provided, in which secondary air nozzles open out in the region of the nozzle mouth.
- a nozzle jet having a substantially larger opening angle ⁇ of at least approximately 30 ° to 45 ° can be produced. From the secondary air nozzles Exiting compressed air jets act on the emerging from the nozzle jet of droplets and atomizing air and expand it. At the same time, the advantages of the annular gap atomization according to the German patent application DE 10 2005 048 489.1 can be maintained even without a continuous annular gap, and in particular the formation of large peripheral drops is prevented.
- the nozzle according to the invention thus results from a two-fluid nozzle with annular gap atomization according to the unpublished German patent application DE 10 2005 048 489.1, by replacing the annular gap for the annular gap atomization by a ring of individual air nozzles which surround the nozzle mouth.
- the individual secondary air nozzles are arranged in a circle around the nozzle mouth around and that at several secondary air nozzles whose outlet jets touch or even overlap in the region of the nozzle mouth, so that a continuous annular beam of secondary air surrounds the nozzle mouth.
- the imaginary projections of the secondary air bores in the plane of the nozzle mouth can overlap to form a closed, annular surface.
- the nozzle according to the invention can thus have a geometric overlap have the secondary air holes in the mouth of the nozzle and either this overlap already takes place in the wall region of the nozzle mouth or only on an imaginary plane at the level of the nozzle mouth.
- an annular gap atomization may also be provided.
- a main spraying direction of the secondary air nozzles is aligned into a main spray jet emanating from the nozzle mouth.
- the central longitudinal axes of the secondary air nozzles to a central longitudinal axis of the main nozzle at an angle ß of 20 ° to 80 ° are arranged.
- the spray of secondary air nozzles receives both a component parallel to the central longitudinal axis of the main nozzle and a perpendicular thereto arranged component, which is mainly responsible for the expansion of the spray.
- Different expansions of the spray jet can be achieved by the variation of the angle ß.
- the central longitudinal axes of the secondary air nozzles do not intersect the central longitudinal axis of the main nozzle.
- the secondary air nozzles are aligned tangentially to an imaginary circle concentric with the central longitudinal axis of the main nozzle.
- the central longitudinal axes of the secondary air nozzles appear as tangents which rest on an imaginary circle concentrically surrounding the central longitudinal axis of the main nozzle. Since the secondary air nozzles moreover include an angle of less than 90 ° with the central longitudinal axis of the main nozzle, they thus touch an imaginary circular cylinder which concentrically surrounds the central longitudinal axis of the main nozzle.
- this imaginary circle has a radius which is between 30% and 80% of the radius of the spray jet of the main nozzle at the level of the circle.
- Such an orientation of the secondary air nozzles results in a clear widening of the spray jet with fine-droplet atomization. If one thus considers the imaginary circle on which the projection of the central longitudinal axes of the secondary air nozzles tangentially abuts, and especially the plane in which this circle lies, this plane forms, with the outer boundary of the main spray jet, a circular cutting line with a spray jet radius.
- the imaginary circle then has a radius which is between 30% and 80% of this spray radius.
- the imaginary circle is arranged downstream of the nozzle mouth of the main nozzle.
- the contact points of the central longitudinal axes of the secondary air nozzles are thus at an imaginary circular cylinder about the central longitudinal axis of the main nozzle downstream of the nozzle mouth.
- the secondary air nozzles open upstream of the nozzle mouth of the main nozzle in the outflow from the mixing chamber to the nozzle mouth.
- the secondary air nozzles open directly in front of the nozzle mouth in the discharge channel. It may be advantageous that touch the mouths of the secondary air nozzles at the entrance to the discharge or partially overlap.
- a separate air supply line is provided to the secondary air nozzles.
- the amount of air and the speed of the air exiting the secondary air nozzles can be adjusted separately and used, for example, to set a desired spray jet angle.
- this adjustment means are then required for setting an air pressure at the secondary air nozzles.
- the secondary air nozzles are in flow communication with a feed line for compressed gas, wherein this feed line is also in flow communication with the mixing chamber.
- a simple construction of the nozzle according to the invention results when the air required for the secondary air nozzles from the supply line for compressed gas of the main nozzle is shown.
- the secondary air nozzles can advantageously be connected to an annular space surrounding the mixing chamber. In this way, the two-fluid nozzle according to the invention can be constructed very compact.
- the nozzle mouth is surrounded by an annular gap, wherein the annular gap can be acted upon with compressed air.
- annular gap atomization water droplets at the nozzle mouth, which originate from a liquid film occupying the wall of the outflow channel, can be drawn out into liquid lamellae and atomized into fine droplets.
- An additional annular gap atomization can be advantageous in particular if the individual secondary air nozzles do not touch or overlap at the edge of the outflow channel.
- an outflow channel initially narrows continuously and then, starting from a constriction in the outflow channel, widens continuously again towards the nozzle mouth.
- the outflow channel can be designed in such a way and the pressure of the liquid and of the compressed gas can be adjusted so that at least sections of supersonic speed are achieved in the outflow channel.
- Such a Schleierluftdüse or Hüllluftdüse may be provided in addition to the annular gap for the Annularspaltverdüsung and is subjected to lower pressure air than is required for the Annularspaltverdüsung.
- FIG. 5 is a view on the plane V-V of FIG. 4 to illustrate the arrangement of the secondary air nozzles in the two-fluid nozzle of Fig. 4,
- FIG. 13 is a sectional view of a fourth embodiment of a two-fluid nozzle according to the invention.
- FIG. 14 is a sectional view of a nozzle outlet of the two-component nozzle of FIG. 13 defining component
- Fig. 15 is a view of the component of Fig. 14 from below.
- the sectional view of FIG. 3 shows a two-substance nozzle 30 according to the invention, which has a feed tube 34 for the liquid to be sprayed, arranged concentrically with respect to a central longitudinal axis 32 of the nozzle.
- the feed tube 34 merges into a frusto-conical constriction 36 and then into a cylindrical constriction 38, which is followed by a mixing chamber 40 which widens in the shape of a truncated cone.
- the mixing chamber is provided in its peripheral wall with inlet openings 42 for compressed gas.
- the inlet openings 42 are arranged in two spaced-apart, along the outflow direction, rings in the wall of the mixing chamber 40.
- the mixing chamber 40 is adjoined by an outflow channel 44, which ends at the nozzle mouth 46 and initially narrows continuously and then expands continuously again starting from a constriction 45.
- the boundary of the outflow channel has a continuously curved shape.
- the mixture of gas and liquid, for example air and water, formed in the mixing chamber 40 is greatly accelerated and can reach supersonic speed in the divergent section.
- Compressed gas is fed to the two-substance nozzle 30 via a compressed gas pipe 48 which surrounds the feed pipe 34 concentrically.
- the compressed gas is accordingly guided in the annular region between feed tube 34 and compressed gas tube 48.
- the compressed gas then passes through the inlet openings 42 into the mixing chamber 40.
- inlet openings of secondary air nozzles 52a, 52b are arranged in the compressed gas according to the indicated in Fig. 3 arrows 54th entry.
- the secondary air nozzles 52 are formed as bores in a closure piece 56 which centrally carries the outflow channel 44 and at the upstream end of the outflow channel 44 provides a flange for receiving a, the mixing chamber 40 defining tubular component.
- the annulus 50 for the compressed gas is also If formed by the component 56, and at its upstream end, the component 56 is screwed to the compressed gas tube 48.
- the secondary air nozzles 52a, 52b have central longitudinal axes 58a, 58b which enclose an angle ⁇ with the central longitudinal axis 32 of the main nozzle defined by the outflow channel 44.
- the angle ß in the illustration of FIG. 3 is about 45 ° and can be between about 20 ° and about 80 °.
- the secondary air nozzles 52a, 52b open into the outflow channel 44 immediately upstream of the nozzle mouth 46.
- the central longitudinal axes 58a and 58b of the two illustrated secondary air nozzles 52a, 52b intersect downstream of the nozzle mouth 46 with the central longitudinal axis 32.
- a Hüllluftdü- 66 surrounding the nozzle mouth 46 annular which is formed by means of a Hüllluftrohres 68.
- compressed gas is supplied at a lower pressure than the mixing chamber 40 supplied compressed gas.
- the enveloping air surrounds the spray jet 64 annularly.
- FIG. 4 shows a two-substance nozzle 70 according to the invention in accordance with a further embodiment of the invention. Parts identical to the two-substance nozzle 30 of FIG. 3 are provided with the same reference numerals and will not be explained again.
- four secondary air nozzles 72a, 72b, 72c and 72d are provided in the two-fluid nozzle 70, wherein only three secondary air nozzles 72a, 72b and 72d can be seen in the representation of FIG.
- the orifices of the four secondary air nozzles 72a, 72b, 72c and 72d are indicated in an outflow channel 74 of the two-component nozzle 70. These openings are located directly above a nozzle mouth 76.
- the respective central longitudinal axes 78a to 78d are shown. It can be seen from the representation of FIG.
- the central longitudinal axis 78a to 78d of the two-substance nozzle 72a to 72d are inclined on the one hand by the angle ⁇ to the central longitudinal axis 32 of the main nozzle, as can already be seen in FIG.
- the central longitudinal axes 78a to 78d but are skewed to the central longitudinal axis 32 and lie tangentially to a circle which is arranged concentrically to the central longitudinal axis 32 of the main nozzle.
- the secondary air nozzles 72a to 72d thus impart a twist to the two-substance mixture emerging from the outflow channel 74 and thereby ensure a widening of the spray jet to the spray angle ⁇ .
- the lines of action of the secondary air jets are therefore not directed towards the central longitudinal axis 32 of the main jet, but they dive into this main jet at a suitable radius which is between 20% and 80% of the radius of the principal ray at the point in question.
- the inclination angle ß of the central longitudinal axes of the secondary air nozzles relative to the central longitudinal axis 32 of the main nozzle plays a significant role, wherein, as mentioned, here the angle range between 20 ° and 80 ° for this angle ß is particularly advantageous.
- the nozzle 30 according to the invention thus results from a two-substance nozzle with annular gap atomization according to the unpublished German patent application DE 10 2005 048 489.1, by replacing the annular gap for the annular gap atomization by a ring of individual air nozzles, which surround the nozzle mouth.
- an annular gap atomization may be provided with the annular gap 80 in addition to the ring of secondary air nozzles.
- a certain disadvantage of the nozzle according to the invention could be seen in the fact that the provision of secondary air requires additional energy.
- conventional two-fluid nozzles with a single nozzle mouth produce a very compact, streamlined droplet jet.
- the two-substance nozzle 70 of FIG. 4 is provided with a Schleierluftdüse 82 in addition to an annular gap 80, which is directly adjacent to the outflow 74 and provided for annular gap atomization for the purpose of avoiding coarse liquid droplets on the nozzle mouth 76 , which annularly surrounds the annular gap 80 and is provided for the supply of pressurized gas at a lower pressure than into the mixing chamber 40 and the annular gap 80.
- the illustration of FIG. 5 shows a view of the two-fluid nozzle 70 from below and approximately at the level of the dashed line in Fig. 4 VV. In the illustration of FIG.
- the central longitudinal axes 78a to 78d bear tangentially on an imaginary circle with the radius n approximately at the level of the plane VV and therefore downstream of the nozzle mouth 76.
- the radius of this circle n is about 50% of the radius of the spray jet of the main nozzle at this point, which is defined in Fig. 4 by the section line of the dashed plane VV and also indicated by dashed lines lateral surface 84 of the main spray in Fig. 4.
- the radius ri can be between 30% and 80% of the radius of the principal ray at the point in question. In other words, and as can be seen in Fig.
- the radius T 1 is between the radius of the nozzle mouth 76 and the radius of a constriction 86 in the discharge channel 74.
- the central longitudinal axes 78a to 78d thus tangentially touch an imaginary circular cylinder, which is concentric with the central longitudinal axis 32 of the main nozzle is aligned and whose radius between the radius of the nozzle mouth 76 and the radius of the constriction 86 in the convergent-divergent-shaped outflow 74 of the two-fluid nozzle 70 is located.
- the contact point of the central longitudinal axes 78a to 78d at this imaginary circular cylinder can be located downstream of the nozzle mouth, but with the appropriate design of the nozzle but also at the level of the nozzle mouth itself or even upstream thereof.
- FIG. 6 shows a two-substance nozzle 90 according to the invention with a nozzle body 92, which has a through hole, not visible in FIG. 6, which forms a nozzle mouth 94 on its exit from the nozzle body 92.
- the shape of the nozzle orifice 94 is of a circular shape. This is caused by nozzle bores of four secondary air nozzles opening in the area of the nozzle mouth.
- the representation of FIG. 7 shows the two-component nozzle 90 in a side view, with nozzle bores of the secondary air nozzles being additionally indicated by dashed lines.
- nozzle bores 96, 98, 100 and 102 are indicated by dashed lines, which are all arranged at an angle of approximately 45 ° to a central longitudinal axis of the nozzle and open into an outflow channel 104 in the region of the nozzle orifice 94.
- FIG. 8 shows a view of the two-component nozzle 90 from below, ie from the side of the nozzle mouth 94. Good to see the four nozzle holes 96, 98, 100 and 102 and their staggered to a coordinate system through the central longitudinal axis arrangement.
- the nozzle bores 96, 98, 100 and 102 are thereby arranged tangentially to an imaginary circle about the central longitudinal axis of the nozzle and do not intersect the central longitudinal axis.
- the detail D which shows the mouths of the nozzle bores 96, 98, 100 and 102 in the area of the nozzle mouth, is shown enlarged, wherein the ellipses of the detail D, which indicate the mouth area, are visible only when In the nozzle body 92 first the nozzle bores 96, 98, 100 and 102 of the secondary air nozzles are introduced before the outflow channel 94. From the detail D it can be seen that the orifices of the nozzle bores 96, 98, 100 and 102 touch each other and thereby form a ring-like configuration as a whole around the central longitudinal axis of the two-substance nozzle.
- the secondary air emerging from the nozzle bores 96, 98, 100 and 102 thus forms an annular air jet which surrounds the spray jet emerging parallel to the central longitudinal axis. It is thus ensured that a fluid film resting against the wall of the outflow channel 104 and driven through the flow toward the nozzle mouth 94, is detected by secondary air from one of the nozzle bores 96, 98, 100 or 102 over the entire circumference of the outflow channel 104 is drawn to a thin liquid lamella at the nozzle mouth 94 and atomized into fine droplets.
- the illustration of FIG. 9 shows a sectional view along the line AA in FIG. 7.
- the central through-hole of the nozzle and the nozzle bores 96, 98, 100 and 102 of the secondary air nozzles can be clearly seen.
- the nozzle bores 96, 98, 100 and 102 intersect at the level of the sectional plane AA, each with a blind hole 106, wherein the blind holes 106 emanate from an outer periphery of the nozzle, as can be seen in Fig. 6, and provided for the insertion of throttle screws are to be able to set a free cross section of the nozzle bores 96, 98, 100 and 102 can.
- FIG. 10 shows a view of the two-substance nozzle 90 according to the invention from the side of the nozzle mouth 94 and indicates the course of a section line B-B.
- the section line B-B initially runs centrally through the nozzle bore 102, bends vertically at the height of the central longitudinal axis, traverses the outflow channel 94 and then bends at the level of the center of the nozzle bore 98 again at right angles.
- FIG. 11 shows the sectional view along the line B-B.
- the course of the nozzle bores 102, 98 which initially run parallel to a central longitudinal axis of the two-component nozzle 90 can be clearly seen, after passing through the respective associated blind hole 106 by 45 ° bend, and then finally open in the area of the nozzle mouth 94 in the outflow channel 104.
- the nozzle bores 98, 102 and, of course, the nozzle bores 96, 100 which are not visible in FIG. 11, start from an annular space 108, which is shown in FIG. 12 and is created by inserting a mixing chamber component 110 into the nozzle body 92. In this annulus 108 pressurized gas is introduced, which then enters through a first holes 112 in a mixing chamber 114 and on the other hand into the nozzle bores 96, 98, 100, 102 of the secondary air nozzles.
- the mouth of the nozzle bores in the region of the nozzle orifice 94 can be seen, which has one of these circular openings. give a different shape cylindrical shape of the outflow channel 104.
- FIG. 13 shows a sectional view of a two-substance nozzle 120 according to the invention in accordance with a fourth embodiment of the invention.
- the nozzle bores which are to be introduced obliquely to the central longitudinal axis of the nozzle, are problematic for the two-component nozzles 30, 70 and 90 shown in FIGS. 3, 4, 5 and 6 to 12.
- the dual-substance nozzle 120 of FIG. 13 therefore, another possibility was chosen to realize a ring of secondary air nozzles arranged in the region of the nozzle mouth.
- the two-fluid nozzle 120 has a feed tube 122 through which liquid to be sprayed is supplied to the nozzle.
- the feed tube 122 is surrounded by a concentric compressed gas tube 124, which in turn is surrounded concentrically by a Schleierluftrohr 126.
- Schleierluftrohr 126 It has already been explained that the veiling air is supplied at a substantially lower pressure than the compressed gas used for atomization.
- the pressure of the compressed gas between 1 bar and 1, 5 bar are absolute, the supplied air would then supplied, for example, with an absolute pressure of about 40 mbar to 80 mbar.
- the provision of fog air essentially serves to avoid incrustations in the region of the nozzle mouth.
- the compressed gas tube 124 has a frusto-conical component 130 which tapers toward a nozzle mouth, and the veiled air tube 126 also runs in the form of a truncated cone toward the nozzle mouth 128 and essentially parallel to the component 130.
- the feed tube 122 is extended by means of a mixing chamber component 132, which is provided with a plurality of compressed gas bores 134, 136, 138.
- the compressed gas bores 134, 136, 138 are each arranged at an angle of about 45 ° to a central longitudinal axis of the nozzle, wherein pressurized gas is thereby introduced in the outflow direction into the mixing chamber and the extensions of the central axes of the pressure gas bores 134, 136, 138, the central longitudinal axis of the two-fluid nozzle 120 intersect.
- a plurality of, for example four, compressed gas bores 134, 136, 138 are uniformly spaced and arranged around the circumference of the mixing chamber component 132. Seen in the outflow direction of the nozzle, a total of three rings with compressed gas bores 134, 136, 138 are arranged, all of which open into a mixing chamber 140. A cross-section of an annular gap between the pressurized gas tube 124 and the mixing chamber member 132 decreases downstream of each ring of pressurized gas bores 134, 136, 138.
- a liquid nozzle 142 is provided, which first clearly narrows the free cross section of the supply pipe 122 and then has a further cross-sectional constriction and protrudes with a nozzle pipe 144 into the mixing chamber 140.
- a swirl insert 146 may optionally be provided in the liquid nozzle 142.
- the nozzle tube 144 extends so far into the mixing chamber 140 in that the extensions of the pressure gas bores 134 coincide with the end of the nozzle tube 144.
- the pressurized gas entering the mixing chamber 140 through the compressed gas bores 134 thereby ensures that no larger drops of liquid can form at the end of the nozzle tube 144, but rather finely atomizes liquid which may be adhering to the edge of the nozzle tube 144.
- the provision of the fluid nozzle 142 is of considerable advantage, especially when the two-fluid nozzle 120 according to the invention is to be used over a large area of a liquid flow to be atomized.
- the liquid nozzle 142 provided at the entrance into the mixing chamber 140 thus serves to distinctly improve dynamics and the control range of the two-substance nozzle 120. At low liquid flow, the liquid tends to drip instationary when entering the mixing chamber 140, which ultimately leads to unsteady atomization, the so-called spitting of the nozzle and a poor part-load behavior.
- the liquid nozzle 142 is now provided, the nozzle tube 144 projects into the mixing chamber 140.
- the first ring of the pressure gas bores 134 is arranged such that the liquid emerging from the nozzle tube 144 is entrained without intermediate storage by the compressed gas provided for the atomization.
- the pressure gas bores 134 are arranged in the, the liquid nozzle 142 at the inlet to the mixing chamber 140 closest bore ring so that the incoming compressed gas is directed to the mouth of the liquid nozzle 142.
- the mixing chamber component 132 is inserted axially with its downstream end into an outlet component 148, which forms an outflow channel 150 and extends from the end of the mixing chamber 140 to the nozzle mouth 128.
- the mixing chamber 140 expands in the frustoconical direction, as viewed in the flow direction, in order to constrict again at the end of the mixing chamber component 132 through the outlet component 148 in the form of a truncated cone.
- the discharge channel 150 adjoining the mixing chamber 140 initially narrows, then merges into a circular-cylindrical constriction, in order then to expand again toward the nozzle mouth 128.
- the two-fluid nozzle 120 is accordingly designed as a convergent divergent nozzle or Laval nozzle. At least in the divergent Area of the outflow channel 150 reaches the compressed gas-liquid mixture sonic velocity.
- the exit member 148 is provided at its upstream end with an annular flange 152 in which a plurality of through holes 154 are provided evenly spaced from each other.
- the annular flange 152 holds the outlet component 148 between the compressed gas tube 124 and the component 130 on the one hand and, with the through holes 154 on the other, ensures that secondary air can enter into a gap between the component 130 and the outlet component 148.
- the compressed gas then flows as so-called secondary air between the component 130 and the downstream end of the outlet component 148, in order to strike the spray jet in the area of the nozzle mouth 128 at the downstream end of the outlet channel 150.
- the outlet component 148 and the component 130 are not abutting one another in the area of the nozzle mouth 128, so that secondary air can enter over the entire circumference of the outlet channel 150 in the region of the nozzle mouth.
- cutouts 156 are provided at the downstream end of the outlet component 148. These cutouts 156 each form the upper portion of a nozzle channel and can be seen in Fig. 15 in more detail. The secondary air passing between the component 130 and the outlet component 148 is thus channeled and aligned by the cutouts 156, in order then to strike the spray jet from the outflow channel 150 in the area of the nozzle mouth 128.
- the position of the cutouts can be seen more accurately.
- the cutouts 156 with their central axis are tangential to a central axis.
- nem imaginary circle about the central longitudinal axis of the two-fluid nozzle 120 are aligned.
- the spray jet at the nozzle mouth 128 is thereby subjected to a twist and expands. Since the outlet component 148 is manufactured separately and the nozzle channels are formed by means of the cutouts 156 only after the onset of the outlet component 148 into the component 130, the production of the two-component nozzle 120 is considerably facilitated.
- the component 130 can also be provided with cut-outs forming nozzle ducts.
- the two-substance nozzle 120 according to the invention accordingly has a combination of nozzle bores opening out at the nozzle mouth 128 with a circumferential annular gap.
- annular gap and secondary air nozzle bores or Sekundär Kunststoffdü- senkanäle can thus be generated by milling on the outside of the tapered outlet member 148. Additionally or alternatively, the annular gap and the secondary air nozzle bores can also be produced by milling on the inside of the likewise conical outer body, that is to say of the component 130. If the outlet part 148 is brought into contact with the inside of the component 130, no continuous annular gap is formed any more, but only discrete nozzle channels.
- the preparation of the slender secondary air nozzle holes in the two-fluid nozzle 30, 70 and 90 is costly and must be made for example by means of spark erosion.
- the spark erosion also allows, for example, to deviate from cylindrical holes.
- the cutouts 156 on the outlet component 148 can be produced comparatively inexpensively by means of shaped cutters, for example as a rectangular groove or as a semicircular groove. But it is quite possible also an arbitrary different geometry of these cutouts, such as a wavy shape.
- By a suitable spacing of the conical outer body, that is, the component 130, relative to the central nozzle exit part 148 can here to simple A combination of annular gap and Sekundär Kunststoffmaschinesenbohrun- gene be effected.
- the outlet component 148 and the conical outer body instead of providing the cutouts 156 in the outlet component 148, the outlet component 148 and the conical outer body, that is to say the component 130, could again be combined to form a single, cast component, given a corresponding further development of precision casting methods.
Landscapes
- Nozzles (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL07703511T PL1986788T3 (pl) | 2006-02-24 | 2007-02-17 | Dysza rozpyłowa pneumatyczna z umieszczonymi koliście dyszami powietrza wtórnego |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006009147A DE102006009147A1 (de) | 2006-02-24 | 2006-02-24 | Zweistoffdüse mit Weitwinkelstrahl |
PCT/EP2007/001384 WO2007098865A1 (de) | 2006-02-24 | 2007-02-17 | Zweistoffdüse mit kreisförmig angeordneten sekundärluftdüsen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1986788A1 true EP1986788A1 (de) | 2008-11-05 |
EP1986788B1 EP1986788B1 (de) | 2012-12-26 |
Family
ID=38016678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07703511A Not-in-force EP1986788B1 (de) | 2006-02-24 | 2007-02-17 | Zweistoffdüse mit kreisförmig angeordneten sekundärluftdüsen |
Country Status (6)
Country | Link |
---|---|
US (1) | US8857740B2 (de) |
EP (1) | EP1986788B1 (de) |
DE (1) | DE102006009147A1 (de) |
ES (1) | ES2401026T3 (de) |
PL (1) | PL1986788T3 (de) |
WO (1) | WO2007098865A1 (de) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102007034549A1 (de) | 2007-07-22 | 2009-01-29 | Wurz, Dieter, Prof. Dr.-Ing. | Energiespardüse mit Druckluftunterstützung |
DE102007044272A1 (de) * | 2007-09-17 | 2009-04-02 | Wurz, Dieter, Prof. Dr.-Ing. | Vielloch- oder Bündelkopfdüse ohne und mit Druckluftunterstützung |
DE102009037828A1 (de) | 2008-11-11 | 2010-05-20 | Wurz, Dieter, Prof. Dr. | Zweistoffdüse, Bündeldüse und Verfahren zum Zerstäuben von Fluiden |
GB2488144B (en) * | 2011-02-17 | 2014-01-15 | Kelda Showers Ltd | Shower head |
EP2554273A1 (de) | 2011-08-02 | 2013-02-06 | Omya Development AG | Zerstäuberdüsenvorrichtung und deren Verwendung |
RU2482928C1 (ru) * | 2012-03-20 | 2013-05-27 | Олег Савельевич Кочетов | Устройство создания газокапельной струи кочетова |
US9074969B2 (en) | 2012-04-18 | 2015-07-07 | Cooper Environmental Services Llc | Sample fluid stream probe |
JP6166103B2 (ja) * | 2013-06-04 | 2017-07-19 | ヤンマー株式会社 | 尿素水噴射ノズル |
US9981315B2 (en) | 2013-09-24 | 2018-05-29 | Iowa State University Research Foundation, Inc. | Atomizer for improved ultra-fine powder production |
EP3122685A4 (de) * | 2014-03-25 | 2017-11-22 | The Coca-Cola Company | Hochflussspendervorrichtung mit reduziertem schaum |
US10226778B2 (en) * | 2014-06-30 | 2019-03-12 | Carbonxt, Inc. | Systems, lances, nozzles, and methods for powder injection resulting in reduced agglomeration |
DE102015200236A1 (de) | 2015-01-12 | 2016-07-14 | Lechler Gmbh | Verfahren zum Erzeugen eines Sprühstrahls und Zweistoffdüse |
RU2576296C1 (ru) * | 2015-02-06 | 2016-02-27 | Олег Савельевич Кочетов | Вихревой пеногенератор кочетова |
US9746397B2 (en) | 2015-07-20 | 2017-08-29 | Cooper Environmental Services Llc | Sample fluid stream probe gas sheet nozzle |
CN108367304A (zh) * | 2015-10-02 | 2018-08-03 | 喷雾系统公司 | 加压空气辅助的全锥形喷雾喷嘴组件 |
CN105345675B (zh) * | 2015-11-03 | 2019-04-05 | 吉首大学 | 气旋水直喷式带砂冲洗装置 |
RU2622927C1 (ru) * | 2016-03-14 | 2017-06-21 | Олег Савельевич Кочетов | Пеногенератор кочетова |
CN105618290B (zh) * | 2016-03-16 | 2018-06-26 | 湖北荷普药业股份有限公司 | 一种雾化喷头 |
RU2624110C1 (ru) * | 2016-03-18 | 2017-06-30 | Татьяна Дмитриевна Ходакова | Пеногенератор |
DE102016123814A1 (de) * | 2016-12-08 | 2018-06-14 | Air Liquide Deutschland Gmbh | Anordnung und Verfahren zum Behandeln einer Oberfläche |
DE102019209898A1 (de) * | 2019-07-04 | 2021-01-07 | Schmid Silicon Technology Gmbh | Vorrichtung und Verfahren zur Bildung von flüssigem Silizium |
KR20220044516A (ko) * | 2019-07-11 | 2022-04-08 | 더 리젠츠 오브 더 유니버시티 오브 미시건 | 특수 유체들의 에어로졸 프린팅 |
JP7218335B2 (ja) * | 2020-09-11 | 2023-02-06 | 三菱重工業株式会社 | 金属粉末製造装置及びそのガス噴射器 |
CN114682404A (zh) * | 2020-12-31 | 2022-07-01 | 大连理工大学 | 一种外部旋流交叉孔喷射器 |
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US1451063A (en) * | 1923-04-10 | Burner | ||
US733463A (en) * | 1902-02-15 | 1903-07-14 | Ezra D Dennison | Petroleum-burner for furnaces. |
US733579A (en) * | 1903-04-01 | 1903-07-14 | Joseph Fitton | Hydrocarbon-burner. |
US3272441A (en) * | 1965-11-03 | 1966-09-13 | Gulf Research Development Co | Aspirating spray nozzle |
US3642202A (en) * | 1970-05-13 | 1972-02-15 | Exxon Research Engineering Co | Feed system for coking unit |
IT1117662B (it) * | 1977-01-14 | 1986-02-17 | Italimpianti | Bruciatore radiante per combustibile liquidi e gassosi |
US4338099A (en) * | 1979-12-26 | 1982-07-06 | Texaco Inc. | Process for the partial oxidation of slurries of solid carbonaceous fuels |
US4341347A (en) * | 1980-05-05 | 1982-07-27 | S. C. Johnson & Son, Inc. | Electrostatic spraying of liquids |
US4946475A (en) * | 1985-04-16 | 1990-08-07 | The Dow Chemical Company | Apparatus for use with pressurized reactors |
DE3514931A1 (de) * | 1985-04-25 | 1986-10-30 | Deutsche Babcock Werke AG, 4200 Oberhausen | Vorrichtung und verfahren zum einspeisen von schlamm |
FR2660215B1 (fr) * | 1990-04-02 | 1995-07-21 | Stein Industrie | Lance de dispersion de pulpe. |
DE10222863C1 (de) * | 2002-05-23 | 2003-11-20 | Edmar Link | Minimalmengen-Kühlschmiervorrichtung |
US6997405B2 (en) * | 2002-09-23 | 2006-02-14 | Spraying Systems Co. | External mix air atomizing spray nozzle assembly |
DE102005048489A1 (de) | 2005-10-07 | 2007-04-19 | Dieter Prof. Dr.-Ing. Wurz | Zweistoffdüse mit Ringspaltzerstäubung |
DE102006001319A1 (de) | 2006-01-09 | 2007-07-12 | Wurz, Dieter, Prof. Dr.-Ing. | Zweistoffdüse mit Lavalcharekteristik sowie mit Vorzerteilung in der Flüssigkeitszuleitung |
-
2006
- 2006-02-24 DE DE102006009147A patent/DE102006009147A1/de not_active Withdrawn
-
2007
- 2007-02-17 WO PCT/EP2007/001384 patent/WO2007098865A1/de active Application Filing
- 2007-02-17 US US12/224,027 patent/US8857740B2/en not_active Expired - Fee Related
- 2007-02-17 ES ES07703511T patent/ES2401026T3/es active Active
- 2007-02-17 PL PL07703511T patent/PL1986788T3/pl unknown
- 2007-02-17 EP EP07703511A patent/EP1986788B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2007098865A1 * |
Also Published As
Publication number | Publication date |
---|---|
PL1986788T3 (pl) | 2013-05-31 |
DE102006009147A1 (de) | 2007-08-30 |
US8857740B2 (en) | 2014-10-14 |
ES2401026T3 (es) | 2013-04-16 |
EP1986788B1 (de) | 2012-12-26 |
US20100163647A1 (en) | 2010-07-01 |
WO2007098865A1 (de) | 2007-09-07 |
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