EP3204167B1 - Zweistoffdüse - Google Patents

Zweistoffdüse Download PDF

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Publication number
EP3204167B1
EP3204167B1 EP14783810.6A EP14783810A EP3204167B1 EP 3204167 B1 EP3204167 B1 EP 3204167B1 EP 14783810 A EP14783810 A EP 14783810A EP 3204167 B1 EP3204167 B1 EP 3204167B1
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EP
European Patent Office
Prior art keywords
liquid
nozzle
channel
gas
outlet
Prior art date
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Active
Application number
EP14783810.6A
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German (de)
English (en)
French (fr)
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EP3204167A1 (de
Inventor
Markus Stefan
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Spraying Systems Manufacturing Europe GmbH
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Spraying Systems Manufacturing Europe GmbH
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Publication of EP3204167A1 publication Critical patent/EP3204167A1/de
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Classifications

    • 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
    • B05B7/0483—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 gas and liquid jets intersecting in the mixing chamber
    • 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
    • B05B7/0081—Apparatus supplied with low pressure gas, e.g. "hvlp"-guns; air supplied by a fan
    • 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
    • B05B7/025—Nozzles having elongated outlets, e.g. slots, for the material to be sprayed
    • 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
    • B05B7/045—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 parallel just upstream the mixing chamber
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids

Definitions

  • the invention relates to a two-substance nozzle, a nozzle device and a method for operating a two-substance nozzle.
  • Dual fluid nozzles are used in applications where finely atomized liquid drops are required, including, for example, in dust deposition devices or gas cooling devices.
  • a liquid or a liquid mixture or a suspension which can also have additives, such as cleaning agents or the like, is fed to a two-substance nozzle.
  • a gas under pressure flows out of a chamber with the liquid and supports the atomization.
  • the liquid atomized with the aid of the compressed air is released as an atomized spray jet at at least one outlet opening of the two-substance nozzle.
  • a two-substance nozzle is, for example, out EP 0 714 706 B1 known.
  • the two-fluid nozzle has a liquid connection and an air connection.
  • the liquid connection is fluidly connected to a liquid channel which extends coaxially along a nozzle axis and opens into a mixing chamber.
  • the liquid stream flows as a jet along the nozzle axis into the mixing chamber.
  • Radial to the nozzle axis several injection channels open into the mixing chamber and are fluidly connected to the air connection.
  • the axial is in the mixing chamber Liquid flow is atomized via the air flowing transversely thereto and is discharged to the outside along the nozzle axis through an outlet opening.
  • the nozzles are usually operated with water as a liquid and compressed air as an application medium for atomizing the water.
  • Compressors are used to generate compressed air, which are expensive to purchase and maintenance-intensive.
  • the compressors must be brought to the place of use or available there, which cannot always be ensured. Due to the small dimensions of the channels in known two-component nozzles, water must also be supplied with as free of dirt particles as possible so that the nozzle does not become blocked.
  • FR 1 008 377 A describes a two-component nozzle which has a nozzle body which delimits a flow space which leads to a nozzle outlet, with a gas channel for supplying a gas into the flow space and with a liquid channel for supplying a liquid.
  • the liquid channel has an annular feed gap which is formed between two housing parts of the central nozzle and a narrow annular outlet channel which is defined between two lips of the housing parts.
  • the outlet channel is oriented obliquely to the central axis of the nozzle in order to allow a thin liquid film to emerge into the flow space in the direction opposite to the flow direction of the gas. The liquid film is acted upon by the gas, deflected and atomized and discharged through the nozzle outlet.
  • DE 41 28 670 A1 describes an atomizing nozzle with a liquid channel for supplying one to be atomized Working fluid and a channel for supplying a gaseous atomizing fluid, for example.
  • the working fluid can be injected into the atomizing fluid in the form of a coherent jet in the same or opposite direction.
  • the working fluid stream and the atomizing fluid stream are brought into contact with one another in an atomizing zone by executing a relative movement, wherein they are aligned parallel to one another within an atomizing section extending in the flow direction until the working fluid is completely atomized.
  • WO 94/08724 A1 describes a fuel injection nozzle in which the liquid jet is introduced into the air flow against the direction of air flow, deflected and discharged via the nozzle outlet via a fuel supply part and a concave, annular gap between a valve element and a valve seat.
  • a two-component nozzle which has a nozzle body which delimits a flow space which leads to a nozzle opening which forms a nozzle outlet.
  • a gas channel serves to supply a gas, for example air, and opens into the flow space.
  • a liquid channel of the two-substance nozzle is designed to supply a liquid, for example water, and has at least one outlet opening. The liquid emerges into the flow space through the outlet opening. The liquid is acted upon by the gas in the flow space to form a liquid film in the flow space.
  • the outlet opening defines an outlet direction for the liquid from the liquid channel into the flow space. The outlet opening is directed towards a flow direction of the liquid film in the flow space.
  • the liquid channel is formed by a guide body which is set up and designed to divide a liquid flow in the flow space and to guide the liquid flowing to the nozzle opening.
  • the guide body has an airfoil shape or an elongated teardrop shape or a symmetrical wedge shape in cross section.
  • An end face of the guide body facing the nozzle opening forms a tear-off edge for the liquid film, which is located in the vicinity of the nozzle opening.
  • the liquid exiting from this is acted upon by the gas stream in such a way that it is deflected and then continues to flow essentially in the opposite direction of flow. It is formed into a thin film of liquid. This provides the basis for a good atomization of the liquid film acted upon by the gas, for example air. Reduced gas pressures can be used, so that the use of a compressor can be dispensed with if necessary.
  • the direction of flow of the liquid film is determined by the direction of gas flow.
  • the liquid and the gas emerge from a nozzle opening from the two-substance nozzle.
  • the arrangement of the gas inlet and the nozzle opening defines the flow direction for the liquid film to the nozzle outlet in the flow space.
  • the liquid channel and the outlet opening preferably extend in such a way that, when they are projected onto a projection plane running transversely through the flow space and perpendicular to the outlet direction, they form an at least partially curved, meandering or meandering line.
  • the liquid channel extends with its outlet opening in a circular cylindrical nozzle body in an arc along the cylinder jacket wall at a radial distance from the latter.
  • it can also extend in a serpentine, meandering or other suitable manner with one or more turns or loops across the nozzle body in order to create the longest possible arc length of the outlet opening or the largest possible outlet area defined by the outlet opening.
  • the nozzle body can also have the shape of a square or rectangular cylinder.
  • gas flowing into the flow space can be used particularly effectively for liquid film formation even under low pressure.
  • the liquid can be effectively expelled and atomized from the two-substance nozzle even without the use of compressed air in such a way that fine liquid droplets form behind the two-substance nozzle.
  • Compressed air is to be understood here in particular as compressed air with an overpressure of more than 1 bar.
  • the two-component nozzles can advantageously be developed as follows:
  • the liquid channel is preferably arranged at least in sections within the flow space, so that the liquid channel is at least partially surrounded by the flow space.
  • the liquid channel preferably extends through the flow space. To this way, the liquid can be expelled into the flow space over a particularly large area and distributed to form a film.
  • the liquid channel preferably extends at least in sections in an arc around the flow direction.
  • the arcuate shape of the liquid channel in the flow space allows a relatively large outlet opening for the liquid to be created, so that the liquid can be distributed on a large guide surface for the liquid film in a compact nozzle body.
  • the liquid channel preferably runs at least in sections along the circumference of the nozzle body.
  • a direction of flow through the channel is defined for the liquid channel, which is preferably oriented transversely to the direction of flow of the liquid film outside the channel. A long flow path of the liquid film through the nozzle body can thereby be created.
  • the liquid channel is spiral-shaped.
  • the liquid channel is preferably a spiral, at least in sections.
  • the spiral may, for example, but not necessarily, be an Archimedean spiral.
  • the spiral can be one or three-dimensional, that is, it can form a screw.
  • the liquid channel can also be circular, for example.
  • the liquid channel can also contain several, for example concentric, circular sections.
  • the liquid channel can also follow all or part of an arbitrary path with radial segments and peripheral segments, for example in a meandering shape, serpentine, zigzag, but preferably without kinks, etc. in the flow space, so that a sufficient length for the present purposes of the liquid channel and the outlet opening can be ensured.
  • the liquid channel is formed by at least a first channel wall and a second channel wall.
  • the guide body with guide surfaces for the liquid film can be formed by the first channel wall and / or the second channel wall.
  • the contour of the guide body, formed by the outer surface of the first channel wall and / or the outer surface of the second channel wall, is suitably designed to guide the liquid emerging from the outlet opening as a liquid film to the nozzle opening.
  • the amount of liquid supplied and the amount of gas supplied can be used particularly effectively for liquid film formation and atomization.
  • the guide surface which is preferably formed by the outer surfaces of the first channel wall and the outer surface of the second channel wall, a sufficient effective length can be created for the flowing gas on the liquid film. In this way, extremely fine atomization of the liquid can be achieved even with low gas pressure.
  • the gas flowing to the nozzle opening flows past the guide surface and drives the liquid or the liquid film to the nozzle opening.
  • the liquid film can be excited to vibrate by the gas flowing over the liquid film.
  • the film can advantageously be stretched and thereby become thinner.
  • the guide body is designed in such a way that it can divide the liquid flow into the flow space after exiting the outlet opening, so that the liquid flow flows around the guide body in the flow space, preferably on two sides.
  • the guide body is also suitably designed to promote the deflection of the liquid in the flow direction through the flow space against the exit direction and the film formation.
  • the outlet opening is preferably arranged on an end face of the liquid channel or the guide body, so that after deflection, the liquid is distributed substantially uniformly over the outer channel wall surfaces which form the guide surface. Due to the division of the liquid flow and the bilateral flow around the guide body through the liquid and the gas, both sides of the guide body oriented transversely to the gas or liquid flow direction serve for the conduction and formation of the liquid film. This increases the area of the liquid film and thus the effective area of the gas flow.
  • the second channel wall is preferably a mirror image of the first channel wall, the mirror plane being parallel to the Central or cylinder axis runs.
  • the cross section of the guide body is preferably symmetrical with respect to an axis which leads through the imaginary connecting line from the outlet opening of the liquid channel to the nozzle opening of the nozzle body.
  • the guide body preferably has a preferably symmetrical wedge shape in the direction of an end face facing away from the outlet opening of the liquid channel.
  • the guide body particularly preferably has an airfoil shape in cross section.
  • the guide body can also have an elongated drop shape in cross section. These shapes are particularly suitable for deflecting the liquid when it emerges from the outlet opening and for forming and guiding the thin liquid film.
  • the end face of the guide body facing the nozzle opening preferably forms a tear-off edge for the liquid film, which is located in the vicinity of the nozzle opening. The liquid can be separated from the guide surface by the tear-off edge and carried out of the nozzle body through the nozzle opening and atomized by the gas stream.
  • the outlet opening of the liquid channel is preferably designed to be continuous. This allows the liquid to flow freely into the flow space and promotes the formation of a closed, uninterrupted liquid film.
  • the outlet opening preferably follows the shape or curve shape of the section of the liquid channel which extends through the flow space.
  • the outlet opening is, for example, also spiral, circular, meandering or otherwise designed with one or more turns or loops like the liquid channel.
  • the outlet opening preferably extends along the circumference of the flow space.
  • the outlet opening can, for example, extend in an arc shape along an inner radial boundary surface of the flow space.
  • the flow space can be delimited, for example, by a cylindrical wall, along which the outlet opening extends at least in sections.
  • the outlet opening can, for example, also extend in an arc shape along the circumference of the flow space or the nozzle body on a path with a decreasing diameter.
  • the spiral shape of the outlet opening extends along the circumference of the nozzle body preferably at least by one revolution (by at least 360 °) or even by at least two revolutions.
  • the outlet opening can be "wound up" in this way.
  • This preferably also applies to the liquid channel and the guide surface. Due to the wound shape of the outlet opening and the guide surface, the liquid film can be exposed to the gas flow over the entire cross-sectional area of the nozzle body. In this way, a long outlet opening and a large guide surface can be formed in a compact nozzle body in a confined space.
  • the large guide surface formed on the surface of the guide body ensures a thin film of water on which the gas flow can act over a large area.
  • Fine atomization of the liquid can thus be achieved even at low gas pressures of, for example, a maximum of 300 mbar. Such pressures can be generated with normal fans or blowers. The use in the purchase, in Operation and maintenance of expensive compressors can be avoided. This expands the field of application and the variety of locations where the two-component nozzle according to the invention can be used.
  • the outlet opening is preferably an outlet slot or gap, as a result of which the liquid is expelled in an almost linear manner.
  • the outlet slot is preferably arranged on the end face of the guide surface facing the gas channel. In this way, a particularly thin, large-area, preferably coherent liquid film can be produced on the guide surface.
  • The, for example, arc-shaped or spiral-shaped extension along the circumference of the flow space can create a gap-shaped outlet opening, which nevertheless nevertheless provides a large outlet area through which the required amount of liquid enters the flow space.
  • the free flow path through and out of the nozzle body preferably always has a dimension of at least 2 mm transverse to the direction of flow.
  • the two-substance nozzle thus created is less susceptible to blockages, even when the two-substance nozzle is loaded with water contaminated with dirt particles. As a result, the dual-substance nozzle can also be used reliably in places where clean water is not available for the nozzle.
  • the flow space may have a section that is spiral.
  • the spiral section may contain the spiral liquid channel.
  • the spiral Flow space can have an open end face at which the gas channel opens into the flow space.
  • the outlet opening of the liquid channel is preferably oriented in the same direction as the open end face of the spiral section of the flow space.
  • the outlet opening can be offset towards the rear in the direction of the nozzle opening.
  • the gas flow can be divided radially by the arrangement described, the flow space nevertheless remaining coherent. In this way, the existing gas flow can be directed past the guiding surfaces of the liquid channel particularly closely over a long effective length.
  • the gas channel preferably opens into the flow space in the opposite direction to the outlet opening, the opening lying opposite the nozzle opening. In this way, the gas flow through the flow space is fixed in a direction that is opposite to the direction of the liquid flow when it exits the outlet opening. The liquid is thus deflected particularly effectively and distributed on the guide surface.
  • the flow space tapers in the direction of the nozzle outlet. This increases the flow velocity of the gas, which promotes liquid film formation and the expulsion of the liquid from the nozzle opening.
  • the nozzle opening which can also be referred to as a nozzle outlet, is preferably a slot or a gap.
  • the nozzle outlet gap can be curved, for example curved in a spiral, around the direction of flow.
  • the nozzle body is essentially cylindrical and has a gas connection which is connected in terms of flow to the gas channel and a liquid connection which is connected in terms of flow to the liquid channel.
  • the gas connection and the liquid connection are preferably arranged on a common first end face of the nozzle body.
  • the nozzle outlet is preferably arranged on an opposite second end face of the nozzle body.
  • the nozzle body with the gas channel and the liquid channel as a whole is preferably produced in one piece, in particular by 3D printing. 3D printing or other additive manufacturing processes are particularly suitable for the manufacture of the nozzle body.
  • a nozzle device which contains at least one of the two-substance nozzles described above, wherein the nozzle device also includes a blower which is set up to supply the two-substance nozzle with gas.
  • the blower preferably generates a pressure ratio of the gas pressure at the mouth of the gas channel into the flow space to the pressure on the suction side of the blower of at most 1.3.
  • the pressure at the mouth of the gas channel into the flow space is preferably increased by a maximum of 300 mbar compared to the pressure on the suction side.
  • a method for operating a two-substance nozzle in particular a two-substance nozzle with the features described above, is created, which has the following steps: Liquid is fed to the two-substance nozzle via a liquid channel.
  • the liquid channel is formed by a guide body which is set up and designed to divide a liquid flow in the flow space and to guide the liquid flowing to the nozzle opening.
  • the guide body has an airfoil shape or an elongated teardrop shape or a symmetrical wedge shape in cross section.
  • An end face of the guide body facing the nozzle opening forms a tear-off edge for the liquid film, which is located in the vicinity of the nozzle opening.
  • the liquid is expelled from the liquid channel into a flow space.
  • the discharge takes place from an outlet opening in a liquid outlet direction.
  • Gas is also fed into the flow space.
  • a gas flow direction is defined in the flow space, in particular by the relative arrangement of the gas inlet and nozzle opening.
  • the liquid outlet takes place in a direction that differs from the gas flow direction.
  • the liquid outlet direction and the gas flow direction are preferably opposite to each other.
  • the gas entering the flow space is acted upon by the gas.
  • the liquid is deflected around the guide body and a liquid film is formed which flows to a nozzle outlet in a flow direction opposite to the liquid exit direction.
  • the liquid is dispensed from the nozzle body through the nozzle outlet.
  • the gas is allowed to flow past the surface of the liquid film.
  • the liquid film is transported towards the nozzle outlet and can also be excited to vibrate and form waves, which promotes atomization outside the nozzle body.
  • the liquid is preferably ejected from the liquid channel into the flow space through a narrow outlet slot or gap.
  • the ejection takes place linearly and preferably opposite to the gas flow.
  • the linear ejection can take place along an arc along the circumference.
  • the line-like ejection is particularly preferably carried out from an at least sectionally curved, meandering or tortuous, preferably spiral-shaped gap or slot which is curved around the gas flow direction, so that even with a small slot or gap width, an adequate exit surface for the liquid is provided.
  • the linear ejection of the liquid preferably takes place on the end face of the guide body which contains the liquid channel.
  • a quantity of liquid is supplied to the liquid channel, so that the cross section of the liquid channel is preferably completely filled with liquid.
  • the liquid channel is also continuously cleaned by the liquid and the risk of dirt particles sticking to the channel walls is reduced.
  • the gas is supplied with the aid of a blower, the outlet of which is connected via a line to the gas connection of the flow space.
  • the two-component nozzle 10 shown has a nozzle body 11 which is essentially cylindrical.
  • the nozzle body 11 has a first end face 12 and a preferably flat second end face 13.
  • a gas connection 14 and a liquid connection 16 are arranged on the first end face 12 (see FIG. Figure 5 ).
  • a nozzle opening or nozzle outlet 17 is arranged on the second end face 13 of the nozzle body 11.
  • the nozzle outlet 17 is an outlet slot or narrow outlet gap which is wound around the cylinder axis Z by more than two complete rotations to form a flat spiral.
  • Figure 2 shows a longitudinal section through the nozzle body 11.
  • a gas channel 18 connects to the end face 12.
  • the gas channel 18 is essentially cylindrical and is delimited by the cylindrical wall 19 of the nozzle body 11.
  • the nozzle body 11 has a flow space 21, which is also delimited by the cylindrical wall 19 of the nozzle body 11.
  • the gas channel 18 opens axially into the flow space 21 within the nozzle body 11.
  • a spiral wall 22 is arranged in the flow space 21.
  • the flow space 21 is given the shape of a spiral arm by the spiral wall 22.
  • the central axis Z of the spiral is parallel to the cylinder axis Z or coincides with it.
  • the flow space 21 adjoins the gas channel 18 with a flat, axially open inlet side 23.
  • the inlet side 23 of the flow chamber 21 forms an open end face, which faces the end face 12, on which the gas channel 18 is connected to the gas connection 14.
  • the flow space 21 is divided radially by the spiral wall 22, but is open, continuous and in the circumferential direction U. unbranched.
  • the Indian Figure 2 flow space 21 formed by a single spiral arm can also be formed by at least two spiral arms.
  • the flow space 21 can alternatively have, for example, a plurality of concentric cylindrical ring-shaped spaces which have radial flow connections and divide the gas flow radially and in the circumferential direction U.
  • the flow space 21 has a front section 24 and a rear section 26.
  • the front section 24 adjoins the inlet side 23 and has a radial spiral arm height H that is constant along the cylinder axis Z.
  • the rear section 26 adjoins the front section 24.
  • the spiral arm height H gradually decreases toward the nozzle outlet 17.
  • the spiral-shaped nozzle outlet slot 17 adjoins the rear section 26.
  • a liquid channel 27 is arranged in the flow space 21.
  • the feed section 28 extends parallel to the cylinder axis Z starting from the first end face 12 of the nozzle body 11.
  • the feed section 28 has a feed channel wall 29.
  • the spiral wall 22 branches off from the feed section 28 transversely to the cylinder axis Z in the circumferential direction U on the one hand and an outlet section 31 of the liquid channel 27 radially spaced apart therefrom.
  • the outlet section 31 preferably has only two fastening points, a first fastening point 31a being arranged on the feed section 28 and a second fastening point 31b is arranged in the center of the nozzle body 11 and is connected to the inner end of the spiral wall 22. Additional fastening points, in particular webs between the spiral wall 22 and the outlet section 31 can be omitted, so that an unimpeded gas and liquid flow is made possible axially outside along the outlet section 31.
  • the outlet section 31 extends axially from the front section 24 into the rear section 26.
  • the outlet section 31 extends through the flow space 21 along the circumference of the nozzle body 11, so that a section of the liquid channel 27 is surrounded by the flow space 21.
  • the outlet section 31 has a first channel wall 32 and a second channel wall 33.
  • the first channel wall 32 has a first wall outer surface 34 and the second channel wall 33 has a second wall outer surface 35, each of which, viewed along the cylinder axis Z, is spiral, so that the outlet section 31 has the shape of a flat spiral.
  • the outlet section 31 has an outlet side 37.
  • the first channel wall 32 and the second channel wall 33 are not connected on the outlet side 37, so that a gap-shaped, coherent outlet opening 38 is created radially between the first channel wall 32 and the second channel wall 33, which follows the course of the outlet section 31.
  • the outlet opening 38 is arranged at a distance from the inlet side 23 of the flow space 21 and faces it.
  • the outlet opening 38 is flat and oriented transversely to the gas flow direction S.
  • the outlet opening 38 here has in particular the shape of a flat spiral, which, however, could also be designed as a three-dimensional spiral, that is to say a screw. Extends through the spiral shape the outlet opening 38 along the circumference of the flow space 21.
  • the outlet opening 38 extends in particular in an arc shape along the spiral wall 22 and the wall 19 of the nozzle body 11. Because of the spiral shape, the outlet opening 38 also extends in an arc shape along the circumference of the flow space 21 on a path increasingly reducing diameter.
  • the side of the outlet section 31 opposite the outlet side 37 forms a detachment side 39.
  • the outlet section 31 tapers axially in a wedge shape towards the detachment side 39 or the nozzle opening 17 and is in the rear section 26 of the flow chamber 17 which tapers in the direction of the nozzle opening 17 arranged.
  • the first outer wall surface 34 and the second outer wall surface 35 extend from the exit side 37 to the detachment side 39.
  • the first outer wall surface 34 is oriented radially outwards and the second outer wall surface 35 is oriented radially inwards.
  • the first channel wall 32 and the second channel wall 33 are connected to one another on the detaching side 39 and there form a tear-off edge 40 for a liquid film 41 which flows along the channel walls 32, 33.
  • the release side 39 or tear-off edge is arranged in the vicinity, at a distance from the nozzle outlet 17.
  • the channel walls 32, 33 thus jointly form a wedge shape or elongated teardrop shape which is substantially symmetrical with respect to a longitudinal and symmetry plane parallel to the cylinder axis Z and which is similar to an airfoil profile shape.
  • Figure 3 illustrates the one described above Two-component nozzle 10 in a longitudinal sectional view. Due to its orientation in the flow space 21, the outlet opening 38, together with the first channel wall 32 and second channel wall 33, defines an outlet direction A for the liquid on the inlet side 23. This is oriented opposite to the flow direction S of the gas which flows from the first end face 12 to the second end face 13.
  • the two-substance nozzle 10 described so far with the nozzle body 11, the gas channel 18 and the liquid channel 27 is preferably designed as a one-piece, integral body and can be produced, for example, by an additive manufacturing process, in particular by 3D printing.
  • the nozzle body 11 is preferably free of seams and joints and is made of a uniform material, preferably plastic or metal. Although it is also possible to produce the nozzle body 11 by means of several separately manufactured and assembled parts, this is less desirable here, inter alia, because of the greater outlay and the disadvantages associated with seams and joints.
  • the two-component nozzle 10 described above can be used for many applications, such as for moistening or cooling objects in industrial production, for spraying water and the like. In particular, it is suitable for use in dust depositing devices or gas cooling devices.
  • the two-fluid nozzle 10 is operated as follows, the description being based on FIG Figures 1-5 relates:
  • the two-component nozzle 10 is filled with gas, for example Air, which is set in motion by a fan.
  • Figure 5 illustrated which shows an embodiment of a nozzle device 42 according to the invention in a simplified block diagram, as it has the two-substance nozzle 10 and a blower 43, the blower 43 is connected to the gas connection 14, which opens into the gas channel 18 of the two-substance nozzle 10 on the end face 12 .
  • the relative arrangement of the gas connection 14 on the end face 12, the gas channel 18 and the flow space 21 and the nozzle outlet 17 on the opposite end face 13 defines a gas flow direction S in the flow space 21.
  • a pump 44 is connected to the liquid connection 16 on the first end face 12 of the nozzle body 11, the liquid connection 16 being connected to the supply section 28 of the liquid channel 27.
  • the pump 44 conveys water from a liquid supply 46, so that the two-substance nozzle 10 is fed with liquid, for example water.
  • the internal flow dimensions within the nozzle body 11, in particular the spiral arm height H, the cross-sectional area of the liquid channel, the width of the outlet gap 38, as determined by the radial distance of the channel walls 32, 33, or the height of the nozzle outlet 17 etc. are adequately dimensioned, are preferably at least 2 mm, so that water contaminated with dirt can also be used for feeding the two-substance nozzle 10 without there being any noticeable risk of the two-substance nozzle 10 becoming blocked.
  • the liquid initially flows along the feed section 28 into the outlet section 31.
  • the liquid flows along the outlet section 31 the circumferential direction U transverse to the cylinder axis Z around the gas flow S.
  • the outlet section 31 accordingly defines a channel direction K in which the liquid flows in the outlet section 31 and which is oriented transversely to the gas flow direction S. This is in Figure 3 indicated by the symbols " ⁇ " and "x”, which symbolize a flow out of the drawing plane or into the drawing plane.
  • the liquid is ejected linearly through the gap-shaped outlet opening 38 into the front section 24 of the flow space 17 in the outlet direction A.
  • the outlet opening 38 opposite the first end face 12, at which the gas channel 18 opens into the flow space 21, the outlet direction A is opposite to the gas flow direction S.
  • the liquid flowing out of the outlet opening 38 is captured by the oppositely directed gas stream S and deflected in the gas flow direction S by 180 °.
  • the liquid is distributed by the gas flow on both sides around the outlet section 31 to the first outer wall surface 34 and the second outer wall surface 35 of the channel walls 32, 33, forming a liquid film 41.
  • the outer wall surfaces 34, 35 form guide surfaces for the liquid film 41.
  • the channel walls 32, 33 thus form a guide body 36 for the liquid, which extends along the circumference of the nozzle body 11.
  • the guide body 36 divides the flow space 21 and the liquid flow radially outside the liquid channel 27, so that the liquid has the guide body 36 on two sides, via the in the figures flows around the upper, first outer wall surface 34 and the lower, second outer wall surface 35. Due to the opposite gas flow, which is largely uniform in the radial direction, and the essentially symmetrical guide body 36, the liquid flow outside the liquid channel 27 is largely evenly divided.
  • the gas flowing on the liquid surface to the nozzle outlet 17 then drives the liquid film 41 in the gas flow direction S toward the nozzle outlet 17.
  • the liquid film 41 is also acted upon by the gas in such a way that the liquid film 41 is additionally excited to vibrate. In this case, pre-atomization of the liquid films 41 can already occur while they flow together with the partial gas flows over the outer wall surfaces 34, 35 on the guide body 36 to the detaching side 39.
  • the partial liquid flows 41 flowing over the wall outer surfaces 34, 35 become increasingly thinner and accelerated.
  • the partial liquid flows 41 meet at the tear-off edge 40 and are separated from the guide body 36 by this. They are expelled together with the gas flow through the nozzle outlet opening 17 out of the two-substance nozzle 10, the liquid atomizing into fine liquid drops as it emerges from and outside the two-substance nozzle 10.
  • Figure 6 illustrates a flow diagram of a general method 50 for operating a two-fluid nozzle according to the invention, this in particular on the two-component nozzle 10 Figure 1-5 can be applied.
  • Method 50 begins by supplying liquid to a two-fluid nozzle, e.g. the two-fluid nozzle 10, via a liquid channel (e.g. 27), as illustrated in step 51.
  • a liquid channel e.g. 27
  • the liquid then flows through the liquid channel and is ejected from it into a flow space (e.g. 17) in a liquid exit direction A, as illustrated in step 52.
  • a flow space e.g. 17
  • gas is supplied into the flow space in a gas flow direction S (step 53).
  • the gas flow direction S differs from the liquid exit direction A and is preferably opposite thereto.
  • the liquid flowing into the flow space is acted upon by the gas flow in such a way that the liquid is deflected and a liquid film (e.g. 41) is formed which flows in a flow direction S opposite to the liquid exit direction A to a nozzle outlet (e.g. 17) (step 54).
  • the liquid film can already be atomized to a certain degree by the gas flow.
  • the liquid is discharged to the outside through the nozzle outlet from the two-substance nozzle.
  • the liquid is torn apart by the flowing gas and atomized.
  • the dispensing can take place in such a way that the emerging liquid is slightly frustoconical spreads outwards, which further supports the atomization.
  • the gas is fed into the flow space with a blower (e.g. 43).
  • a blower e.g. 43
  • the liquid is ejected from the liquid channel into the flow space in a linear manner through a narrow outlet gap, preferably a spiral wound outlet gap.
  • the exit gap can also be curved, meandered or meandering at least in sections in some other way. In any case, this creates the longest possible exit gap, and the liquid emerging from the exit gap can be effectively acted upon and deflected as required and / or formed into a thin liquid film, which advantageously further supports the atomization.
  • FIGS 7a-7f exemplary courses of liquid channels 27 with associated outlet openings 38 according to different embodiments of the invention. Shown are flat views that result from the projection of the liquid channels 27 and outlet openings 38 onto a projection plane that extends across the flow space 21 and essentially perpendicular to the outlet direction A (cf. Figure 2 ) the liquid runs out of the outlet opening 38. Although the limited width of the slot-shaped outlet openings 38 When projecting onto the projection plane results in band-shaped curve shapes, these are represented here by thin lines for simple and clear illustration.
  • Figure 7a shows the projection line of the spiral liquid channel 27 with the outlet opening 38 shown in FIGS Figures 1 to 3 illustrated preferred embodiment.
  • the spiral shape can result from a flat spiral or a helical course of the liquid channel 27.
  • the course of the liquid channel 27 with the outlet opening 38 could also take the form of a circle or several concentric circles, all of which are preferably continuously connected to one another, but need not be.
  • a curved arch section can be used, e.g. a circle or a spiral, which preferably spans an angle of at least 90 °, more preferably 180 °, are sufficient.
  • An extension over at least one revolution (at least 360 °) or even over two revolutions is particularly advantageous.
  • a meandering, meandering shape of a liquid channel 27 with the outlet opening 38 is shown, which has several, here four loops 61, which are rotated by an angle of 90 ° here around a central central axis of the flow space 17 and are connected to one another.
  • the number of loops 61 and the angle of rotation can be chosen as desired.
  • Figures 7d-7f furthermore show embodiments in which the spiral-like, star-shaped or serpentine courses of the liquid channels 27 and the outlet openings 38 each have a plurality of straight line sections 64 with curved or curved connecting sections 65 arranged therebetween.
  • the gradients can be two-dimensional or three-dimensional.
  • an extended, coherent, kink-free shape is obtained with a projection line that penetrates or spans a large part of the flow space 17 or the projection plane.
  • the large length of the liquid channel 27 and the outlet opening 38 makes it possible, even with a very limited gap width, to let a sufficient amount of liquid emerge from the outlet opening in the form of an extensive, uniform, thin film of liquid and then to atomize it effectively.
  • the nozzle opening 17 forming the outlet of the nozzle 10 preferably has an essentially same shape as the projection line of the liquid channel 27 and the outlet opening 38, but can also differ therefrom.
  • the flow space 21 any preferably cylindrical or tubular shape with an example circular, oval, square, rectangular, or any other suitable cross-section.
  • a two-substance nozzle 10 is specified, which can preferably be supplied with gas and operated by a blower 43.
  • the two-component nozzle 10 has a nozzle body 11 which delimits a flow space 21.
  • the two-fluid nozzle 10 also has a liquid channel 27 with an outlet opening 38.
  • a liquid film 41 is formed within the flow space 21 and is transported to the nozzle outlet 17 by the gas flow within the flow space 21.
  • the outlet opening 38 of the liquid channel 27 defines an outlet direction A for the liquid into the flow space 21, which is preferably opposite to the flow direction S of the liquid film 41.
  • the liquid channel 27 and its outlet opening 38 preferably extend at least in sections curved, meandering or meandering across the nozzle body 11.
EP14783810.6A 2014-10-09 2014-10-09 Zweistoffdüse Active EP3204167B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/071692 WO2016055116A1 (de) 2014-10-09 2014-10-09 Zweistoffdüse

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JP (1) JP6442048B2 (ja)
CN (1) CN106999965B (ja)
AU (1) AU2014408517B2 (ja)
CA (1) CA2963017C (ja)
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FI20175158L (fi) * 2017-02-21 2018-08-22 Metabar Tech Oy Suutin, suutinjärjestely ja nesteenjakojärjestelmä
CN109621757A (zh) * 2018-12-17 2019-04-16 邹权明 水下水气混合器
CN109877260B (zh) * 2019-03-21 2023-11-03 中信戴卡股份有限公司 一种模具润滑剂旋转喷盘装置
CN109821674A (zh) * 2019-03-21 2019-05-31 中信戴卡股份有限公司 一种模具润滑剂旋转喷涂喷盘装置
CN111940159B (zh) * 2019-05-14 2023-05-26 沈阳芯源微电子设备股份有限公司 一种晶圆表面颗粒清洗双旋喷嘴
SE546027C2 (sv) * 2019-11-19 2024-04-16 Brokk Ab Fjärrstyrd demoleringsrobot med en anordning för dammbekämpning med hjälp av en vätska vid rivningsarbete samt ett förfarande för dammbekämpning vid en sådan demoleringsrobot

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WO2016055116A1 (de) 2016-04-14
EP3204167A1 (de) 2017-08-16
US10471448B2 (en) 2019-11-12
JP6442048B2 (ja) 2018-12-19
AU2014408517B2 (en) 2020-05-21
WO2016055116A8 (de) 2017-04-27
CN106999965A (zh) 2017-08-01
US20170304850A1 (en) 2017-10-26
CA2963017A1 (en) 2016-04-14
JP2017531553A (ja) 2017-10-26
AU2014408517A1 (en) 2017-05-25
CN106999965B (zh) 2020-01-17
CA2963017C (en) 2021-07-27
ES2796227T3 (es) 2020-11-26

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