EP3804861B1 - Buse d'injection pour un dispositif de pulvérisation et dispositif de pulvérisation - Google Patents

Buse d'injection pour un dispositif de pulvérisation et dispositif de pulvérisation Download PDF

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Publication number
EP3804861B1
EP3804861B1 EP20190177.4A EP20190177A EP3804861B1 EP 3804861 B1 EP3804861 B1 EP 3804861B1 EP 20190177 A EP20190177 A EP 20190177A EP 3804861 B1 EP3804861 B1 EP 3804861B1
Authority
EP
European Patent Office
Prior art keywords
injection
injection chamber
nozzle
nozzle according
medium
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.)
Active
Application number
EP20190177.4A
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German (de)
English (en)
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EP3804861A1 (fr
Inventor
Boris Schmidt
Gabriele Beddies
Robert HEINKEL
Hannes Knupfer
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Lechler GmbH
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Lechler GmbH
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Publication of EP3804861A1 publication Critical patent/EP3804861A1/fr
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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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/06—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in annular, tubular or hollow conical form
    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/26—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device
    • B05B7/28—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device in which one liquid or other fluent material is fed or drawn through an orifice into a stream of a carrying fluid
    • B05B7/30—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device in which one liquid or other fluent material is fed or drawn through an orifice into a stream of a carrying fluid the first liquid or other fluent material being fed by gravity, or sucked into the carrying fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31243—Eductor or eductor-type venturi, i.e. the main flow being injected through the venturi with high speed in the form of a jet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/244—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using carrying liquid for feeding, e.g. by suction, pressure or dissolution, a carried liquid from the container to the nozzle
    • B05B7/2454—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using carrying liquid for feeding, e.g. by suction, pressure or dissolution, a carried liquid from the container to the nozzle the carried liquid and the main stream of carrying liquid being brought together by parallel conduits, one conduit being in the other

Definitions

  • the invention relates to an injection nozzle for an, in particular agricultural, spraying device for sucking in a liquid suction medium by means of a pressurized liquid propellant medium and for spraying a mixture of the suction medium and the propellant medium, with a nozzle housing, with an injection chamber arranged in the nozzle housing, an in propulsion nozzle opening into the injection chamber for generating a propellant medium jet entering the injection chamber and a liquid suction opening for the liquid suction medium.
  • the invention also relates to a spray device, in particular for agricultural purposes, for spraying a mixture of a liquid suction medium and a liquid propellant medium.
  • a high-pressure cleaning device which has, among other things, an injection nozzle.
  • the injection nozzle is provided for sucking in a liquid suction medium by means of a pressurized liquid propellant medium.
  • the mixture of propellant medium and suction medium is then sprayed using a high-pressure lance with a spray nozzle at the outlet.
  • the injection nozzle has an injection chamber and a propulsion nozzle opening into the injection chamber.
  • a liquid suction opening for the liquid suction medium opens into an annular channel which has a flow connection to the injection chamber.
  • EP 2 883 618 A1 is an injection nozzle for a spray device for sucking in a liquid suction medium by means of a pressurized liquid propellant medium and for spraying a mixture of the suction medium and the propellant medium.
  • the injection nozzle has a nozzle housing with an injection chamber arranged in the nozzle housing and a propulsion nozzle opening into the injection chamber for generating a propellant medium jet entering the injection chamber.
  • a liquid suction opening for the liquid suction medium is provided. The liquid suction opening opens into the injection chamber.
  • the injection chamber has a first cone-shaped section that widens in the flow direction and a second cone-shaped section that adjoins the first cone-shaped section and that widens in the flow direction, the second cone-shaped section having a larger cone angle than the first cone-shaped section .
  • an exhaust gas turbocharger is known, a jet pump for generating negative pressure in a negative pressure line being provided in a bypass of the turbocharger.
  • the jet pump has a driving nozzle and an annular channel surrounding the driving nozzle, the annular channel having a flow connection to the injection chamber.
  • a jet pump for sucking in liquid media is known.
  • a liquid suction opening opens into an annular channel which surrounds a propulsion nozzle and which has a flow connection to an injection chamber.
  • a motive nozzle generates a jet of motive medium entering an injection chamber.
  • a liquid intake opening opens into the injection chamber downstream of the propulsion nozzle. Starting from the mouth of the liquid suction opening, the injection chamber first tapers, in order to then widen conically again.
  • the aim of the invention is to improve an injection nozzle and a spray device.
  • an injection nozzle having the features of claim 1 and a spray device having the features of claim 17 are provided for this purpose.
  • Advantageous developments of the invention are specified in the dependent claims.
  • the injection nozzle according to the invention for a spray device is for sucking in a liquid suction medium by means of a pressurized liquid propellant and provided for spraying a mixture of the suction medium and the propellant medium.
  • the injection nozzle has a nozzle housing, an injection chamber arranged in the nozzle housing, a propulsion nozzle opening into the injection chamber for generating a propellant medium jet entering the injection chamber, and a liquid suction opening for the liquid suction medium.
  • the liquid intake opening opens into an annular channel which has a flow connection to the injection chamber.
  • Injection nozzles are known in principle and work according to the so-called Venturi principle.
  • a liquid jet enters an injection chamber, creates a negative pressure in the injection chamber and then entrains gas or air with it.
  • the so-called water jet pump works according to this principle.
  • injection nozzles are problematic in the field of crop protection, since the mixing ratio between the liquid sucked in and the carrier liquid changes greatly with the pressure or the quantity of the carrier liquid. Such a change in the mixing ratio, even if there are unintentional pressure fluctuations in the carrier liquid, is extremely problematic in agricultural engineering.
  • the injection nozzle according to the invention can ensure a substantially constant mixing ratio between the driving medium and the suction medium even when the pressure of the driving medium supplied changes.
  • the liquid suction medium first enters an annular channel that has a flow connection to the injection chamber, a uniform distribution of the suction medium can be ensured initially in the ring channel and then also when it enters the injection chamber.
  • the ring channel can surround the propulsion nozzle.
  • the flow connection from the annular channel to the injection chamber can be formed by means of a plurality of through bores arranged on an imaginary concentric circle or in any other suitable manner. It is advantageous if the suction medium enters the injection chamber in such a way that it evenly surrounds the jet of motive medium emerging from the motive nozzle.
  • the annular channel is open on one side towards the injection chamber, so that the flow connection to the injection chamber is formed by means of an annular gap.
  • the suction medium can enter the injection chamber in the form of an annular jet, so that uniform mixing between the propellant medium and the suction medium can be ensured in the injection chamber.
  • a negative pressure is generated in a den Propellant medium jet surrounding area acts.
  • the suction medium enters the injection chamber via an annular gap, the suction medium is sucked in evenly over the circumference of the injection chamber.
  • the liquid intake opening opens into the annular channel upstream of the outlet opening of the propulsion nozzle.
  • the suction medium in the ring channel can initially be distributed evenly over the circumference of the ring channel, so that the suction medium then also enters the injection chamber via the flow connection to the injection chamber, distributed evenly around the circumference of the jet of propellant medium.
  • the flow connection from the ring channel to the injection chamber opens out into the injection chamber at the level of the outlet opening of the propulsion nozzle.
  • the ring channel is delimited at least on one side by a propulsion nozzle housing of the propulsion nozzle.
  • the suction medium flows in the ring channel around a driving nozzle housing and then, radially surrounding the driving nozzle housing, enters the injection chamber as a ring-shaped jet.
  • This makes it possible to achieve a very uniform volume distribution of the suction medium around the jet of motive medium and to ensure a structurally comparatively simple design of the injection nozzle, since the motive nozzle housing also serves as a one-sided limitation of the ring channel.
  • At least one orifice plate is provided in an intake channel upstream of the liquid intake opening.
  • a quantity of the suction medium entering can be controlled and pressure fluctuations in the propellant medium can also be avoided constant ratio between the amount of motive medium and the amount of suction medium can be ensured.
  • two orifices arranged one behind the other in the direction of flow can be provided in the intake port.
  • the diaphragm openings of the diaphragms or restrictors do not necessarily have to be arranged in alignment with one another, but can also be offset from one another.
  • the nozzle housing is provided with a diaphragm insert, which has a section of the suction channel for sucking in the liquid suction medium and the diaphragm, and which is detachably arranged on the nozzle housing.
  • the injection nozzle according to the invention can be constructed in a modular manner.
  • the passage opening of the orifice can be changed by using an orifice insert with a different orifice. If a mixture of plant protection agent and water is to be produced, the concentration of the plant protection agent in the water can be changed by exchanging the orifice insert.
  • the restrictor bore in other words the aperture, can have a diameter of between 0.1 mm and 1.5 mm, for example.
  • the screen insert is connected to the nozzle housing by means of a sliding guide.
  • the screen insert can be connected to the nozzle housing in a very simple manner.
  • the screen insert has a socket that can be pushed into a suitable hole in the nozzle housing.
  • the socket can be provided with a circumferential sealing ring in order to completely form the intake channel and seal it from the environment simply by pushing in the screen insert.
  • the nozzle housing it is also possible for the nozzle housing to have a socket and the screen insert to have a receiving area.
  • the screen insert can be pushed into the nozzle housing by means of the sliding guide and automatically locks in its end position, for example by locking sealing rings in suitable grooves or receptacles on the nozzle housing.
  • a small recess can be provided between the nozzle housing and the screen insert, for example, into which the blade of a screwdriver can be inserted.
  • the panel insert is then moved a little way in the direction of extension along the sliding guide counter to the direction of insertion. This movement caused by turning the screwdriver is then sufficient to to release the catch between the screen insert and the nozzle housing. After this latching has been released, the panel insert can be easily pulled out of the sliding guide by hand and without the aid of tools.
  • the diaphragm insert is detachably arranged on an injector component that has at least the propulsion nozzle and the injection chamber.
  • the modular structure of the injection nozzle according to the invention can be further developed.
  • different injector components can be used for different suction media.
  • the injector component with the propulsion nozzle which can wear out, can be easily replaced.
  • the injector component with the diaphragm insert attached to it is expediently inserted into an outlet nozzle component of the injection nozzle.
  • the injector component can be removed from the outlet nozzle component and only then can the diaphragm insert be detached from the injector component.
  • the injection chamber downstream of the outlet opening of the propulsion nozzle has a first conical section which widens in the direction of flow, and has a second conical section which adjoins the first conical section and widens in the direction of flow, the second conical section has a larger cone angle than the first conical section.
  • Such a configuration of the injection chamber with two consecutive conical sections allows a mixing ratio between the propellant medium and the suction medium to be kept essentially constant, even if the pressure of the propellant medium fluctuates.
  • a cone angle of the first conical section is in the range from 5° to 15°, in particular between 5° and 10°.
  • a cone angle of the second conical section is in the range of 30° to 40°.
  • the length of the first conical section is in the range of twice to four times, in particular three times, the length of the second conical section.
  • an outlet opening of the propulsion nozzle opens into a section of the injection chamber that tapers conically in the direction of flow.
  • Such a configuration of the injection chamber contributes to a uniform mixing ratio between the propellant medium and the suction medium, even when there are pressure fluctuations in the propellant medium.
  • a cylindrical section of the injection chamber is arranged upstream of the first conical section, with the first conical section adjoining the cylindrical section.
  • a ratio between the diameter of the cylindrical section of the injection chamber and a length of the section of the injection chamber that tapers conically in the flow direction between the outlet opening of the propulsion nozzle and the start of the cylindrical section is in the range from 0.5 to 5, in particular between 1 and 2, especially at 1.4.
  • a ratio between the diameter of the cylindrical section of the injection chamber and a diameter of the outlet opening of the propulsion nozzle is in the range from 1 to 3, in particular between 1.5 and 1.7, in particular 1.6.
  • an orifice is provided in an intake channel upstream of the liquid intake opening, with a ratio between the diameter of the cylindrical section of the injection chamber and a diameter of a through-opening of the orifice in the range from 1.5 to 15, in particular between 4 and 6, in particular at 4.7.
  • a ratio between an area of the cylindrical section of the injection chamber and an area of the flow connection from the ring channel to the injection chamber is in the range from 0.25 to 2.5, in particular between 0.5 and 1, in particular 0.76 .
  • the flow connection between the annular channel and the injection chamber is arranged in a section immediately upstream of the opening into the injection chamber between two walls tapering conically in the direction of flow.
  • annular channel transitions into the injection chamber by means of an annular gap. Since this annular gap between the annular channel and the injection chamber tapers conically in the direction of flow, this contributes to a constant mixing ratio between the propellant medium and the suction medium, even when there are pressure fluctuations in the propellant medium.
  • the problem on which the invention is based is also solved by means of a spray device for spraying a mixture of a liquid suction medium and a liquid propellant medium with an injection nozzle according to the invention.
  • the injection nozzle 10 has an injector component 12 and an outlet nozzle component 14 .
  • the injector component 12 is inserted in sections into the outlet nozzle component 14, cf. 2 to achieve an operable condition of the injector nozzle 12.
  • the injection nozzle 12 is then used in a known manner in a nozzle holder, not shown, of a spraying device, in particular an agricultural spraying device.
  • An orifice 16 can be seen on the injector component 12 which marks the start of an intake channel in the injector component 12 .
  • Liquid suction medium is drawn in from a storage tank via the diaphragm 16, mixed with a liquid propellant medium and a mixture of suction medium and propellant medium is discharged at a downstream end 18 of an injection chamber.
  • the mixture then enters the exit nozzle assembly 14, cf. 2 , and is discharged as a flat jet via an outlet opening 20 of a flat jet nozzle 22 .
  • the flat jet nozzle 22 it goes without saying that essentially any outlet nozzle can be provided on the outlet nozzle component 14, for example a hollow cone nozzle or a full cone nozzle.
  • FIG 2 shows a sectional view of the injection nozzle 10 of FIG 1 in assembled condition.
  • the injector component 12 has now been inserted in sections into the outlet nozzle component 14 .
  • a mixture of liquid suction medium and liquid propellant medium enters an outlet chamber 26, at the downstream end of which the outlet nozzle 22 is then arranged.
  • a propulsion nozzle housing 28 is arranged in the injector component, via which liquid propellant medium, usually pressurized water, is introduced into the injection chamber 24 in the form of a propellant medium jet.
  • the propellant medium jet is in the form of a full jet and enters the injection chamber 24 via an outlet opening 30 in the propellant nozzle housing 28 .
  • the outlet opening 30 has a diameter d TR .
  • the driving nozzle housing 28 is surrounded by an annular channel 32 .
  • a suction channel 34 opens into the annular channel 32 at a liquid suction opening 36.
  • An in 2 left end of the intake passage 34 is shown in the illustration 2 limited by the aperture 16.
  • the screen 16 has a through-opening 38 with a diameter dR .
  • the annular channel 32 is delimited on one side by the driving nozzle housing 28 and is in flow connection with the injection chamber 24.
  • the flow connection between the annular channel 32 and the injection chamber 24 is in the form of an annular gap 40.
  • the annular gap 40 is realized in that the annular channel 32 is open to the injection chamber 24 on one side.
  • An area of the annular gap 40 at the level of the downstream end of the outlet opening 30 is denoted by A S .
  • the flow connection between the annular channel 32 and the injection chamber 24 can also be designed differently, for example by means of several channels.
  • the injection chamber 24 has four sections viewed in the direction of flow.
  • the outlet opening 30 of the propulsion nozzle and the annular gap 40 open into a conically tapering section 42 of the injection chamber, which is generally frustoconical in shape.
  • a cylindrical section 44 adjoins the conically tapering section 42 .
  • the cylindrical section 44 is adjoined by a first, conically widening section 46 which has a first cone angle.
  • a second conically widening section 48 adjoins the first conically widening section 46, which has a second cone angle.
  • the second cone angle is greater than the first cone angle.
  • the first conically widening section 46 is longer than the second conically widening section 48.
  • a cone angle of the first conical section is in the range between 5° and 15° and in particular between 5° and 10 °.
  • a taper angle of the second tapered portion 48 is in the range of 30° to 40°.
  • the first conical section 46 has a length, seen in the direction of flow, which is in the range of twice to four times, in particular three times, the length of the second conical section 48 .
  • the two successive, conically widening sections 46, 48 contribute to a constant mixing ratio between the liquid propellant medium and the liquid suction medium even when the pressure of the propellant medium fluctuates.
  • a jet of motive medium generated by means of the motive nozzle and emerging from the outlet opening 30 of the motive nozzle housing 28 enters the conically tapering section 42 of the injection chamber 24 and creates a negative pressure in the injection chamber 24 by means of the so-called Venturi effect 38 of the diaphragm 16 is sucked into the intake channel 34 and enters the annular channel 32 via the liquid intake opening 36 .
  • the suction medium is distributed in the annular channel 32 and then, viewed over the circumference of the driving nozzle housing 28 , uniformly distributed, enters the injection chamber 24 through the annular gap 40 .
  • Annular gap 40 can also be provided, for example, with a plurality of through-channels between the ring channel 32 and the injection chamber 24 .
  • the jet of propellant medium enters the cylindrical section 44 and then the two conically widening sections 46, 48 of the injection chamber 24 together with the sucked-in suction medium.
  • the jet of propellant medium begins to break up and mixing occurs between the jet of propellant medium and the sucked-in suction medium.
  • a mixture of suction medium and propellant medium enters the outlet chamber 26 .
  • the mixture between the propellant medium and the suction medium is further evened out.
  • a flat jet consisting of a mixture of propellant medium and suction medium then emerges from the outlet nozzle 22 .
  • the special design of the injection nozzle 10 can ensure a constant mixing ratio between the propellant medium and the suction medium, even if the pressure of the propellant medium fluctuates.
  • the injection nozzle 10 according to the invention is therefore particularly suitable for use in agricultural engineering.
  • the outlet nozzle 22 can also be designed as a full cone nozzle or hollow cone nozzle.
  • FIG. 3 shows an enlarged representation of the injector component 12 of the injection nozzle 10 of FIG Figures 1 and 2 .
  • a diameter of the passage opening of the screen 16 is denoted by d R .
  • a diameter of the outlet opening 44 of the driving nozzle housing 28 is denoted by d TR .
  • a length of the conically tapering section 42 of the injection chamber 24 is denoted by h as seen in the direction of flow.
  • a diameter of the cylindrical portion 44 of the injection chamber 24 is denoted by d DH and a cross-sectional area of the cylindrical portion 44 is denoted by A DH .
  • An area of the annular gap 40 at the downstream end of the flow connection between the annular channel 32 and the injection chamber 24 is denoted by AS .
  • a cone angle of the first flared portion 46 of the injection chamber 24 is denoted by ⁇ 1 and a cone angle of the second flared portion 48 of the injection chamber 24 is denoted by ⁇ 2.
  • a length of the cylindrical portion 44 of the injection chamber 24 is denoted by L 0 .
  • a length of the first flared portion 46 is labeled L 1 and a length of the second flared portion 48 is labeled L 2 .
  • L 0 is significantly smaller than h and is only about a third of h in the illustrated embodiment.
  • L 1 and L 2 are significantly larger than L 0 .
  • L 1 is larger than L 2 and L 1 is about twice to four times larger than L 2 .
  • ⁇ 1 is in the range from 5° to 15°, in particular between 5° and 10°.
  • ⁇ 2 is in the range of 30° to 40°.
  • a ratio d DH /h between the diameter d DH of the cylindrical section 44 of the injection chamber 24 and the length h of the section 42 of the injection chamber 24 that tapers conically in the direction of flow between the outlet opening 30 and the start of the cylindrical section 44 is in the range of 0, 5 to 5, in particular between 1 and 2, in particular at 1.4.
  • a ratio d DH /d TR between the diameter d DH of the cylindrical section 44 of the injection chamber and a diameter d TR of the outlet opening 30 of the propulsion nozzle is in the range from 1 to 3, in particular between 1.5 and 1.7, in particular 1. 6.
  • a ratio d DH /d R between the diameter d DH of the cylindrical section 44 of the injection chamber 24 and a diameter d R of a passage opening of the diaphragm 16 is in the range from 1.5 to 15, in particular between 4 and 6, in particular 4.7 .
  • a ratio A DH /A S between an area A DH of the cylindrical section 44 of the injection chamber 24 and an area A S of the flow connection from the annular channel 32 to the injection chamber 24, specifically an area A S of the annular gap 40, is in the range of 0, 25 to 2.5, in particular between 0.5 and 1, in particular at 0.76.
  • the ratios explained above and also the lengths and diameters and angles explained above contribute to a constant mixing ratio between the suction medium and the driving medium, even if there are pressure fluctuations in the driving medium.
  • the injection nozzle according to the invention is therefore particularly suitable for use in agricultural engineering.
  • FIG 4 12 shows an injector component 112 according to a further embodiment of the invention.
  • the injector component 112 is very similar to the injector component 12 of FIG Figures 1 to 3 constructed so that identical elements are either not explained or provided with the same reference numbers.
  • the injector component 112 can instead of the injector component 12 of Figures 1 to 3 in the in the Figures 1 to 3 illustrated outlet nozzle component 14 are used.
  • the injector assembly 112 includes a modular orifice insert 114 .
  • the bezel insert 114 includes the bezel 16 and a portion of the intake port. The intake passage then continues in the injector component 112 .
  • figure 5 shows the panel insert 114 from below and diagonally 6 the panel insert 114 in a sectional view. Based on 6 It can be seen that the bezel insert 114 defines a portion 34A of the intake port. The remaining section 34B of the intake duct, which then leads to the annular duct around the motive nozzle, cf. 2 , however, is formed in the injector component 112 .
  • the orifice insert 114 has the orifice 16 defining the restrictor bore 38 at its upstream end of the intake passage 34A.
  • the flow resistance of the restrictor bore 38 changes and thus a ratio between the amount of suction medium sucked in and the amount of the propellant medium can be set.
  • the section 34A of the intake duct is formed at its downstream end by means of a stub 116 which projects beyond a stop surface 118 of the screen insert 114 .
  • the socket 116 is intended for this, cf. 7 to be inserted into a suitable recess 120 in the injector component 112 .
  • the peripheral projection 122 is formed by means of a sealing ring, so that after the projection 122 has snapped into the groove 124, the two sections 34A, 34B of the intake channel are tightly connected to one another. Only low demands are placed on the tightness of this connection, since the intake channel 34 and thus also the connection of the sections 34A, 34B are under negative pressure when the injection nozzle is in operation.
  • the projection 122 which snaps into the groove 124 when the panel insert 114 is in the installed state, also ensures that the panel insert 114 is mechanically secured to the injector component 112.
  • the sliding guide is formed on the injector component 112 by means of two strip-shaped projections 126 which protrude into a recess on the injector component 112 which extends to the edge of the injector component.
  • an undercut is formed on both sides between the strip-shaped projections 126 and a base 128 of the recess.
  • the screen insert 114 also has strip-shaped projections 130 on both sides, which are matched to the length, height and width of the undercut in the recess.
  • the screen insert 114 can be pushed into the injector component 112 along the sliding guide until the end face 118 of the screen insert 114 strikes the front-side boundary 132 of the recess in the injector component 112 . This state is in 4 shown.
  • the projection 122 on the connecting piece 116 of the panel insert 114 has also snapped into the groove 124 in the recess 120 of the injector component 112 .
  • the edge of a coin or the blade of a screwdriver is inserted into a rectangular recess 134 at the top of the injector component 112 .
  • a delimitation of this recess 134 is formed by the end face 118 of the screen insert 114.
  • the locking connection between screen insert 114 and injector component 112 is thereby released.
  • the bezel insert 114 can then be easily removed by hand from the injector assembly 112 along the sliding guide.
  • the diaphragm insert 114 can then be exchanged for another diaphragm insert, for example, which differs from the diaphragm insert 114 only in that the restrictor bore 38 of the diaphragm 16 has a different dimension.
  • the injection nozzle according to the invention can be adjusted in a simple manner so that different ratios of the amount of suction medium and the amount of propellant medium can be set.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nozzles (AREA)

Claims (17)

  1. Buse d'injection (10) pour un dispositif de pulvérisation pour aspirer un milieu d'aspiration liquide au moyen d'un milieu de propulsion liquide sous surpression et pour pulvériser un mélange du milieu d'aspiration et du milieu de propulsion, avec un boîtier de buse, avec une chambre d'injection (24) agencée dans le boîtier de buse, une buse de propulsion (28) débouchant dans la chambre d'injection (24) pour produire un jet de milieu de propulsion entrant dans la chambre d'injection (24), une ouverture d'aspiration de liquide (36) pour le milieu d'aspiration liquide, l'ouverture d'aspiration de liquide (36) débouchant dans un canal annulaire (32) qui présente une liaison d'écoulement avec la chambre d'injection (24), caractérisé en ce qu'au moins un diaphragme (16) est prévu dans un canal d'aspiration (34) en amont de l'ouverture d'aspiration de liquide (36), en ce que le boîtier de buse est pourvu d'un insert de diaphragme (114) qui présente une section (34A) du canal d'aspiration (34) pour l'aspiration du milieu d'aspiration liquide et le diaphragme (16) et qui est agencé de manière amovible sur le boîtier de buse, en ce que l'insert de diaphragme (114) est relié au boîtier de buse au moyen d'un guidage coulissant et en ce que l'insert de diaphragme (114) est agencé de manière amovible sur un composant d'injecteur (112) qui présente au moins la buse de propulsion (28) et la chambre d'injection (24).
  2. Buse d'injection selon la revendication 1, caractérisée en ce que le canal annulaire est ouvert d'un côté vers la chambre d'injection, de telle sorte que la liaison d'écoulement vers la chambre d'injection est formée au moyen d'un interstice annulaire.
  3. Buse d'injection selon la revendication 1 ou 2, caractérisée en ce que l'ouverture d'aspiration de liquide débouche dans le canal annulaire en amont de l'ouverture de sortie de la buse de propulsion.
  4. Buse d'injection selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que la liaison d'écoulement du canal annulaire à la chambre d'injection débouche dans la chambre d'injection à la hauteur de l'ouverture de sortie de la buse de propulsion.
  5. Buse d'injection selon l'une quelconque des revendications précédentes, caractérisée en ce que le canal annulaire est délimité au moins d'un côté par un boîtier de buse de propulsion de la buse de propulsion.
  6. Buse d'injection selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que la chambre d'injection présente, en aval de l'ouverture de sortie de la buse de propulsion, une première section conique qui s'élargit dans la direction de l'écoulement et une deuxième section conique qui se raccorde à la première section conique et qui s'élargit dans la direction de l'écoulement, la deuxième section conique présentant un angle de conicité plus grand que la première section conique.
  7. Buse d'injection selon la revendication 6, caractérisée en ce que l'angle de conicité de la première section conique se situe dans la plage allant de 5 degrés à 15 degrés, notamment entre 5 degrés et 10 degrés.
  8. Buse d'injection selon la revendication 6 ou 7, caractérisée en ce qu'un angle de conicité de la deuxième section conique se situe dans la plage allant de 30 degrés à 40 degrés.
  9. Buse d'injection selon la revendication 6, 7 ou 8, caractérisée en ce que la première section conique, vue dans la direction de l'écoulement, présente une longueur qui est de l'ordre de deux fois à quatre fois, notamment trois fois, la longueur de la deuxième section conique.
  10. Buse d'injection selon au moins l'une quelconque des revendications précédentes, caractérisée en ce qu'une ouverture de sortie de la buse de propulsion débouche dans une section de la chambre d'injection qui se rétrécit en forme de cône dans la direction de l'écoulement.
  11. Buse d'injection selon au moins l'une quelconque des revendications précédentes, caractérisée en ce qu'une section cylindrique de la chambre d'injection est agencée en amont de la première section conique, la première section conique se raccordant à la section cylindrique.
  12. Buse d'injection selon les revendications 10 et 11, caractérisé en ce qu'un rapport (dDH/h) entre le diamètre (dDH) de la section cylindrique de la chambre d'injection et une longueur (h) de la section de la chambre d'injection qui se rétrécit en forme de cône entre l'ouverture de sortie de la buse de propulsion et le début de la section cylindrique se situe dans la plage allant de 0,5 et 5, notamment entre 1 et 2, notamment à 1,4.
  13. Buse d'injection selon la revendication 11 ou 12, caractérisée en ce qu'un rapport (dDH/dTR) entre le diamètre (dDH) de la section cylindrique de la chambre d'injection et un diamètre (dTR) de l'ouverture de sortie de la buse de propulsion se situe dans la plage allant de 1 à 3, notamment entre 1,5 et 1,7, notamment à 1,6.
  14. Buse d'injection selon la revendication 11, 12 ou 13, caractérisée en ce qu'un diaphragme est prévu dans un canal d'aspiration en amont de l'ouverture de sortie de fluide, un rapport (dDH/dTR) entre le diamètre (dDH) de la section cylindrique de la chambre d'injection et un diamètre (dTR) d'une ouverture de passage du diaphragme se situant dans la plage allant de 1,5 à 15, notamment entre 4 et 6, notamment à 4,7.
  15. Buse d'injection selon l'une quelconque des revendications 11 à 14, caractérisée en ce qu'un rapport (ADH/AS) entre une surface (ADH) de la section cylindrique de la chambre d'injection et une surface (AS) de la liaison d'écoulement du canal annulaire à la chambre d'injection se situe dans la plage allant de 0,25 à 2,5, notamment entre 0,5 et 1, notamment à 0,76.
  16. Buse d'injection selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que la liaison d'écoulement entre le canal annulaire et la chambre d'injection est agencée dans une section immédiatement en amont de l'embouchure dans la chambre d'injection entre deux parois se rétrécissant en forme de cône dans la direction de l'écoulement.
  17. Dispositif de pulvérisation pour pulvériser un mélange d'un milieu d'aspiration liquide et d'un milieu de propulsion liquide, caractérisé par au moins une buse d'injection selon l'une quelconque des revendications précédentes.
EP20190177.4A 2019-09-06 2020-08-10 Buse d'injection pour un dispositif de pulvérisation et dispositif de pulvérisation Active EP3804861B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019213569.2A DE102019213569A1 (de) 2019-09-06 2019-09-06 Injektionsdüse für eine Sprühvorrichtung und Sprühvorrichtung

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EP3804861A1 EP3804861A1 (fr) 2021-04-14
EP3804861B1 true EP3804861B1 (fr) 2023-08-09

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US (1) US11583870B2 (fr)
EP (1) EP3804861B1 (fr)
DE (1) DE102019213569A1 (fr)
PL (1) PL3804861T3 (fr)

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FR3107659B1 (fr) * 2020-02-28 2022-06-24 Solcera Buse de pulvérisation à jet plat et faible dérive.
DE102021203755A1 (de) 2021-04-15 2022-10-20 Volkswagen Aktiengesellschaft Strahlpumpe, insbesondere Strahlpumpe für eine Brennstoffzellenanwendung

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Also Published As

Publication number Publication date
PL3804861T3 (pl) 2024-02-19
DE102019213569A1 (de) 2021-03-11
US20210069733A1 (en) 2021-03-11
US11583870B2 (en) 2023-02-21
EP3804861A1 (fr) 2021-04-14

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