EP3804861B1 - Spray device and injection nozzle for a spray device - Google Patents

Spray device and injection nozzle for a spray device 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
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Active
Application number
EP20190177.4A
Other languages
German (de)
French (fr)
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EP3804861A1 (en
Inventor
Boris Schmidt
Gabriele Beddies
Robert HEINKEL
Hannes Knupfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lechler GmbH
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Lechler GmbH
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Publication of EP3804861A1 publication Critical patent/EP3804861A1/en
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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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  • Nozzles (AREA)

Description

Die Erfindung betrifft eine Injektionsdüse für eine, insbesondere landwirtschaftliche, Sprühvorrichtung zum Ansaugen eines flüssigen Saugmediums mittels eines unter Überdruck stehenden flüssigen Treibmediums und zum Versprühen eines Gemisches aus dem Saugmedium und dem Treibmedium, mit einem Düsengehäuse, mit einer in dem Düsengehäuse angeordneten Injektionskammer, einer in die Injektionskammer mündenden Treibdüse zum Erzeugen eines in die Injektionskammer eintretenden Treibmediumstrahls und einer Flüssigkeitsansaugöffnung für das flüssige Saugmedium. Die Erfindung betrifft auch eine Sprühvorrichtung, insbesondere für landwirtschaftliche Zwecke, zum Versprühen eines Gemisches aus einem flüssigen Saugmedium und einem flüssigen Treibmedium.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.

Aus der internationalen Offenlegungsschrift WO 2016/090029 A1 ist ein Hochdruckreinigungsgerät bekannt, das unter anderem eine Injektionsdüse aufweist. Die Injektionsdüse ist zum Ansaugen eines flüssigen Saugmediums mittels eines unter Überdruck stehenden flüssigen Treibmediums vorgesehen. Das Gemisch aus Treibmedium und Saugmedium wird dann mittels einer Hochdrucklanze mit einer Sprühdüse am Auslass versprüht. Die Injektionsdüse weist eine Injektionskammer und eine in die Injektionskammer mündende Treibdüse auf. Eine Flüssigkeitsansaugöffnung für das flüssige Saugmedium mündet in einen Ringkanal, der eine Strömungsverbindung zur Injektionskammer aufweist.From the international disclosure document WO 2016/090029 A1 a high-pressure cleaning device is known 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.

Aus der europäischen Offenlegungsschrift EP 2 883 618 A1 ist eine Injektionsdüse für eine Sprühvorrichtung zum Ansaugen eines flüssigen Saugmediums mittels eines unter Überdruck stehenden flüssigen Treibmediums und zum Versprühen eines Gemisches aus dem Saugmedium und dem Treibmedium bekannt. Die Injektionsdüse weist ein Düsengehäuse mit einer in dem Düsengehäuse angeordneten Injektionskammer und eine in die Injektionskammer mündende Treibdüse zum Erzeugen eines in die Injektionskammer eintretenden Treibmediumstrahls auf. Es ist eine Flüssigkeitsansaugöffnung für das flüssige Saugmedium vorgesehen. Die Flüssigkeitsansaugöffnung mündet in die Injektionskammer. Die Injektionskammer weist einen ersten kegelförmigen Abschnitt, der sich in Strömungsrichtung erweitert, und einen zweiten kegelförmigen Abschnitt auf, der sich an den ersten kegelförmigen Abschnitt anschließt und der sich in Strömungsrichtung erweitert, wobei der zweite kegelförmige Abschnitt einen größeren Kegelwinkel als der erste kegelförmige Abschnitt aufweist.From the European publication 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 .

Aus der US-Patentschrift US 4,505,431 ist eine Injektionsdüse bekannt, bei der eine Treibdüse in eine Injektionskammer mündet. Die Flüssigkeitsansaugöffnung mündet in einen Ringkanal, der eine Strömungsverbindung zur Injektionskammer aufweist.From the US patent specification U.S. 4,505,431 an injection nozzle is known in which a propulsion nozzle opens into an injection chamber. The liquid intake opening opens into an annular channel which has a flow connection to the injection chamber.

Aus der deutschen Offenlegungsschrift DE 10 2011 085 899 A1 ist eine Injektorpumpe zum Ansaugen eines flüssigen Saugmediums bekannt. Eine Flüssigkeitsansaugöffnung mündet in einen Ringkanal, der eine Strömungsverbindung zur Injektionskammer aufweist.From the German Offenlegungsschrift DE 10 2011 085 899 A1 an injector pump for sucking in a liquid suction medium is known. A liquid intake opening opens into an annular channel which has a flow connection to the injection chamber.

Aus der deutschen Offenlegungsschrift DE 10 2009 046 992 A1 ist ein Abgasturbolader bekannt, wobei in einem Bypass des Turboladers eine Strahlpumpe zur Erzeugung von Unterdruck in einer Unterdruckleitung vorgesehen ist. Die Strahlpumpe weist eine Treibdüse und einen die Treibdüse umgebenden Ringkanal auf, wobei der Ringkanal eine Strömungsverbindung zur Injektionskammer aufweist.From the German Offenlegungsschrift DE 10 2009 046 992 A1 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.

Aus der französischen Offenlegungsschrift FR 2 330 462 ist eine Injektionsdüse bekannt, bei der eine Flüssigkeitsansaugöffnung in einen Ringkanal mündet, wobei der Ringkanal eine Strömungsverbindung zu einer Injektionskammer aufweist.From the French publication FR 2 330 462 an injection nozzle is known in which a liquid intake opening opens into an annular channel, the annular channel having a flow connection to an injection chamber.

Aus der internationalen Offenlegungsschrift WO 2020/043499 A1 ist eine Strahlpumpe zum Ansaugen von flüssigen Medien bekannt. Eine Flüssigkeitsansaugöffnung mündet in einen Ringkanal, der eine Treibdüse umgibt und der eine Strömungsverbindung zu einer Injektionskammer aufweist.From the international disclosure document WO 2020/043499 A1 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.

Aus der deutschen Offenlegungsschrift DE 43 38 585 A1 ist eine Injektordüse bekannt. Eine Treibdüse erzeugt einen in eine Injektionskammer eintretenden Treibmediumstrahl. Stromabwärts der Treibdüse mündet eine Flüssigkeitsansaugöffnung in die Injektionskammer. Die Injektionskammer verjüngt sich ausgehend von der Mündung der Flüssigkeitsansaugöffnung zunächst, um sich dann wieder kegelförmig zu erweitern.From the German Offenlegungsschrift DE 43 38 585 A1 an injector nozzle is known. 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.

Mit der Erfindung sollen eine Injektionsdüse und eine Sprühvorrichtung verbessert werden.The aim of the invention is to improve an injection nozzle and a spray device.

Erfindungsgemäß ist hierzu eine Injektionsdüse mit den Merkmalen von Anspruch 1 und eine Sprühvorrichtung mit den Merkmalen von Anspruch 17 vorgesehen. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.According to the invention, 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.

Die erfindungsgemäße Injektionsdüse für eine Sprühvorrichtung ist zum Ansaugen eines flüssigen Saugmediums mittels eines unter Überdruck stehenden flüssigen Treibmediums und zum Versprühen eines Gemisches aus dem Saugmedium und dem Treibmedium vorgesehen. Die Injektionsdüse weist ein Düsengehäuse, eine in dem Düsengehäuse angeordnete Injektionskammer, eine in die Injektionskammer mündende Treibdüse zum Erzeugen eines in die Injektionskammer eintretenden Treibmediumstrahls und eine Flüssigkeitsansaugöffnung für das flüssige Saugmedium auf. Die Flüssigkeitsansaugöffnung mündet in einen Ringkanal, der eine Strömungsverbindung zur Injektionskammer aufweist.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.

Injektionsdüsen sind prinzipiell bekannt und arbeiten nach dem sogenannten Venturi-Prinzip. Ein Flüssigkeitsstrahl tritt in eine Injektionskammer ein, erzeugt in der Injektionskammer einen Unterdruck und reißt dann Gas oder Luft mit sich. Nach diesem Prinzip funktioniert die sogenannte Wasserstrahlpumpe.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.

Auf dem Gebiet des Pflanzenschutzes sind konventionelle Injektionsdüsen problematisch, da sich das Mischungsverhältnis zwischen angesaugter Flüssigkeit und Trägerflüssigkeit mit dem Druck bzw. der Menge der Trägerflüssigkeit stark ändert. Eine solche Änderung des Mischungsverhältnisses, auch nur bei unbeabsichtigten Druckschwankungen der Trägerflüssigkeit, ist aber in der Landtechnik äußert problematisch. Die erfindungsgemäße Injektionsdüse kann auch bei sich veränderndem Druck des zugeführten Treibmediums ein im Wesentlichen konstantes Mischungsverhältnis zwischen dem Treibmedium und dem Saugmedium sicherstellen.Conventional 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.

Indem das flüssige Saugmedium zunächst in einen Ringkanal eintritt, der eine Strömungsverbindung zur Injektionskammer aufweist, kann eine gleichmäßige Verteilung des Saugmediums zunächst im Ringkanal und dann auch beim Eintritt in die Injektionskammer sichergestellt werden. Der Ringkanal kann die Treibdüse umgeben. Die Strömungsverbindung vom Ringkanal zur Injektionskammer kann mittels mehrerer, auf einem gedachten konzentrischen Kreis angeordneter Durchgangsbohrungen oder auch in sonstiger geeigneter Weise ausgebildet sein. Vorteilhaft ist, wenn das Saugmedium so in die Injektionskammer eintritt, dass es den aus der Treibdüse austretenden Treibmediumstrahl gleichmäßig umgibt.Because 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.

In Weiterbildung der Erfindung ist der Ringkanal zur Injektionskammer hin einseitig offen, so dass die Strömungsverbindung zur Injektionskammer mittels eines Ringspalts gebildet ist.In a development of the invention, 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.

Auf diese Weise kann das Saugmedium in Form eines Ringstrahls in die Injektionskammer eintreten, so dass in der Injektionskammer eine gleichmäßige Vermischung zwischen dem Treibmedium und dem Saugmedium sichergestellt werden kann. Durch den in die Injektionskammer mündenden Treibmediumstrahl wird ein Unterdruck erzeugt, der in einem den Treibmediumstrahl umgebenden Bereich wirkt. Wenn das Saugmedium über einen Ringspalt in die Injektionskammer eintritt, wird über den Umfang der Injektionskammer gesehen das Saugmedium gleichmäßig angesaugt.In this way, 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. By opening into the injection chamber propellant jet, a negative pressure is generated in a den Propellant medium jet surrounding area acts. When 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.

In Weiterbildung der Erfindung mündet die Flüssigkeitsansaugöffnung stromaufwärts der Austrittsöffnung der Treibdüse in den Ringkanal.In a further development of the invention, the liquid intake opening opens into the annular channel upstream of the outlet opening of the propulsion nozzle.

Dadurch kann sich das Saugmedium in dem Ringkanal zunächst gleichmäßig über den Umfang des Ringkanals verteilen, so dass das Saugmedium dann auch über die Strömungsverbindung zur Injektionskammer gleichmäßig um den Umfang des Treibmediumstrahls verteilt in die Injektionskammer eintritt.As a result, 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.

In Weiterbildung der Erfindung mündet die Strömungsverbindung von dem Ringkanal zur Injektionskammer auf Höhe der Austrittsöffnung der Treibdüse in die Injektionskammer.In a development of the invention, 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.

Unmittelbar nach dem Austritt des Treibmediumstrahls aus der Austrittsöffnung der Treibdüse in die Injektionskammer herrscht ein vergleichsweise großer Unterdruck. Indem die Strömungsverbindung von dem Ringkanal zur Injektionskammer auf Höhe der Austrittsöffnung der Treibdüse in die Injektionskammer mündet, kann eine gute, gleichmäßige Saugwirkung erzielt werden.Immediately after the jet of propellant medium emerges from the outlet opening of the propulsion nozzle into the injection chamber, there is a comparatively large negative pressure. Since 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, a good, uniform suction effect can be achieved.

In Weiterbildung der Erfindung ist der Ringkanal wenigstens einseitig durch ein Treibdüsengehäuse der Treibdüse begrenzt.In a further development of the invention, the ring channel is delimited at least on one side by a propulsion nozzle housing of the propulsion nozzle.

Das Saugmedium strömt in dem Ringkanal dadurch um ein Treibdüsengehäuse herum und tritt dann, das Treibdüsengehäuse radial umgebend, als ringförmiger Strahl in die Injektionskammer ein. Dadurch lässt sich eine sehr gleichmäßige Volumenverteilung des Saugmediums um den Treibmediumstrahl erzielen und ein konstruktiv vergleichsweise einfacher Aufbau der Injektionsdüse kann sichergestellt werden, da das Treibdüsengehäuse gleichzeitig als einseitige Begrenzung des Ringkanals dient.As a result, 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.

Gemäß der Erfindung ist in einem Ansaugkanal stromaufwärts der Flüssigkeitsansaugöffnung wenigstens eine Blende vorgesehen.According to the invention, at least one orifice plate is provided in an intake channel upstream of the liquid intake opening.

Mittels einer solchen Blende oder eines solchen Restriktors oder auch mehrerer hintereinander angeordneter Blenden oder Restriktoren kann eine Menge des eintretenden Saugmediums kontrolliert werden und es kann ein auch bei Druckschwankungen des Treibmediums konstantes Verhältnis zwischen der Menge des Treibmediums und der Menge des Saugmediums sichergestellt werden. Beispielsweise können zwei in Strömungsrichtung hintereinander angeordnete Blenden im Ansaugkanal vorgesehen sein. Die Blendenöffnungen der Blenden oder Restriktoren müssen dabei nicht unbedingt fluchtend zueinander angeordnet sein, sondern können auch zueinander versetzt sein.By means of such an orifice or such a restrictor or also several orifices or restrictors arranged one behind the other, 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. For example, 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.

Gemäß der Erfindung ist das Düsengehäuse mit einem Blendeneinsatz versehen, der einen Abschnitt des Ansaugkanals zum Ansaugen des flüssigen Saugmediums und die Blende aufweist und der lösbar an dem Düsengehäuse angeordnet ist.According to the invention, 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.

Durch Vorsehen eines lösbar am Düsengehäuse angeordneten Blendeneinsatzes kann die erfindungsgemäße Injektionsdüse modular aufgebaut werden. Je nachdem, welches Verhältnis zwischen dem Treibmedium und dem Saugmedium gewünscht ist, kann die Durchlassöffnung der Blende verändert werden, indem ein Blendeneinsatz mit einer anderen Blende eingesetzt wird. Soll ein Gemisch aus Pflanzenschutzmittel und Wasser hergestellt werden, kann durch Austauschen des Blendeneinsatzes daher die Konzentration des Pflanzenschutzmittels im Wasser verändert werden. Je nach Anforderung an das Mischverhältnis zwischen Pflanzenschutzmittel und Wasser, allgemein zwischen Saugmedium und Treibmedium, kann die Restriktorbohrung, mit anderen Worten die Blendenöffnung, einen Durchmesser zwischen beispielsweise 0,1 mm bis 1,5 mm aufweisen.By providing a screen insert arranged detachably on the nozzle housing, the injection nozzle according to the invention can be constructed in a modular manner. Depending on the desired ratio between the propellant medium and the suction medium, 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. Depending on the requirement for the mixing ratio between crop protection agent and water, generally between suction medium and propellant medium, the restrictor bore, in other words the aperture, can have a diameter of between 0.1 mm and 1.5 mm, for example.

Gemäß der Erfindung ist der Blendeneinsatz mittels einer Schiebeführung mit dem Düsengehäuse verbunden. Auf diese Weise kann der Blendeneinsatz in sehr einfacher Weise mit dem Düsengehäuse verbunden werden. Beispielsweise weist der Blendeneinsatz einen Stutzen auf, der in eine passende Bohrung des Düsengehäuses eingeschoben werden kann. Der Stutzen kann mit einem umlaufenden Dichtungsring versehen sein, um durch einfaches Einschieben des Blendeneinsatzes den Ansaugkanal vollständig auszubilden und gegen die Umgebung abzudichten. Selbstverständlich ist es auch möglich, dass das Düsengehäuse einen Stutzen und der Blendeneinsatz einen Aufnahmebereich aufweist. Der Blendeneinsatz kann mittels der Schiebeführung in das Düsengehäuse eingeschoben werden und verrastet in seiner Endposition automatisch, beispielsweise durch Einrasten von Dichtungsringen in passende Nuten oder Aufnahmen am Düsengehäuse. Zum Lösen des Blendeneinsatzes kann zwischen dem Düsengehäuse und dem Blendeneinsatz beispielsweise eine kleine Aussparung vorgesehen sein, in die die Klinge eines Schraubendrehers eingeführt werden kann. Durch einfaches Verdrehen des Schraubendrehers wird der Blendeneinsatz dann entgegen der Einschubrichtung ein Stück weit in der Ausschubrichtung entlang der Schiebeführung bewegt. Diese, durch die Drehung des Schraubendrehers verursachte Bewegung reicht dann aus, um die Verrastung zwischen dem Blendeneinsatz und dem Düsengehäuse zu lösen. Nachdem diese Verrastung gelöst ist, kann der Blendeneinsatz von Hand und ohne weitere Zuhilfenahme von Werkzeug einfach aus der Schiebeführung herausgezogen werden.According to the invention, the screen insert is connected to the nozzle housing by means of a sliding guide. In this way, the screen insert can be connected to the nozzle housing in a very simple manner. For example, 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. Of course, 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. To release the screen insert, 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. By simply turning the screwdriver, 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.

Gemäß der Erfindung ist der Blendeneinsatz lösbar an einem Injektorbauteil angeordnet, dass wenigstens die Treibdüse und die Injektionskammer aufweist.According to the invention, the diaphragm insert is detachably arranged on an injector component that has at least the propulsion nozzle and the injection chamber.

Auf diese Weise kann der modulare Aufbau der erfindungsgemäßen Injektionsdüse weitergebildet werden. Für unterschiedliche Saugmedien können beispielsweise unterschiedliche Injektorbauteile verwendet werden. Vor allem kann das Injektorbauteil mit der Treibdüse, die verschleißen kann, in einfacher Weise ausgewechselt werden. Zweckmäßigerweise wird das Injektorbauteil mit dem daran befestigten Blendeneinsatz in ein Austrittsdüsenbauteil der Injektionsdüse eingesetzt. Das Injektorbauteil kann aus dem Austrittsdüsenbauteil entnommen werden und erst dann kann der Blendeneinsatz vom Injektorbauteil gelöst werden.In this way, the modular structure of the injection nozzle according to the invention can be further developed. For example, different injector components can be used for different suction media. Above all, 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.

In Weiterbildung der Erfindung weist die Injektionskammer stromabwärts der Austrittsöffnung der Treibdüse einen ersten kegelförmigen Abschnitt auf, der sich in Strömungsrichtung erweitert, und weist einen zweiten kegelförmigen Abschnitt auf, der sich an den ersten kegelförmigen Abschnitt anschließt und der sich in Strömungsrichtung erweitert, wobei der zweite kegelförmige Abschnitt einen größeren Kegelwinkel als der erste kegelförmige Abschnitt aufweist.In a further development of the invention, 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.

Durch eine solche Gestaltung der Injektionskammer mit zwei aufeinanderfolgenden kegelförmigen Abschnitten lässt sich ein Mischungsverhältnis zwischen Treibmedium und Saugmedium auch bei Druckschwankungen des Treibmediums im Wesentlichen konstant halten.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.

In Weiterbildung der Erfindung liegt ein Kegelwinkel des ersten kegelförmigen Abschnitts im Bereich von 5° bis 15°, insbesondere zwischen 5° und 10°.In a development of the invention, a cone angle of the first conical section is in the range from 5° to 15°, in particular between 5° and 10°.

In Weiterbildung der Erfindung liegt ein Kegelwinkel des zweiten kegelförmigen Abschnitts im Bereich von 30° bis 40°.In a development of the invention, a cone angle of the second conical section is in the range of 30° to 40°.

In Weiterbildung der Erfindung weist der erste kegelförmige Abschnitt in Strömungsrichtung gesehen eine Länge auf, die im Bereich des Zweifachen bis Vierfachen, insbesondere dem Dreifachen, der Länge des zweiten kegelförmigen Abschnitts liegt.In a development of the invention, the length of the first conical section, seen in the direction of flow, is in the range of twice to four times, in particular three times, the length of the second conical section.

In Weiterbildung der Erfindung mündet eine Austrittsöffnung der Treibdüse in einen sich in Strömungsrichtung kegelförmig verjüngenden Abschnitt der Injektionskammer.In a development of the invention, an outlet opening of the propulsion nozzle opens into a section of the injection chamber that tapers conically in the direction of flow.

Eine solche Ausgestaltung der Injektionskammer trägt zu einem gleichmäßigen Mischungsverhältnis zwischen Treibmedium und Saugmedium auch bei Druckschwankungen des Treibmediums bei.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.

In Weiterbildung der Erfindung ist stromaufwärts des ersten kegelförmigen Abschnitts ein zylindrischer Abschnitt der Injektionskammer angeordnet, wobei sich der erste kegelförmige Abschnitt an den zylindrischen Abschnitt anschließt.In a development of the invention, a cylindrical section of the injection chamber is arranged upstream of the first conical section, with the first conical section adjoining the cylindrical section.

Das Vorsehen eines solchen zylindrischen Abschnitts stromaufwärts der beiden kegelförmigen Abschnitte und insbesondere stromabwärts des sich kegelförmig verjüngenden Abschnitts trägt ebenfalls zu einem konstanten Mischungsverhältnis zwischen Treibmedium und Saugmedium auch bei Druckschwankungen des Treibmediums bei.The provision of such a cylindrical section upstream of the two conical sections and in particular downstream of the conically tapering section also contributes to a constant mixing ratio between motive medium and suction medium, even with pressure fluctuations in the motive medium.

In Weiterbildung der Erfindung liegt ein Verhältnis zwischen dem Durchmesser des zylindrischen Abschnitts der Injektionskammer und einer Länge des sich in Strömungsrichtung kegelförmig verjüngenden Abschnitts der Injektionskammer zwischen der Austrittsöffnung der Treibdüse und dem Beginn des zylindrischen Abschnitts im Bereich von 0,5 bis 5, insbesondere zwischen 1 und 2, insbesondere bei 1,4.In a further development of the invention, 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.

In Weiterbildung der Erfindung liegt ein Verhältnis zwischen dem Durchmesser des zylindrischen Abschnitts der Injektionskammer und einem Durchmesser der Austrittsöffnung der Treibdüse im Bereich von 1 bis 3, insbesondere zwischen 1,5 und 1,7, insbesondere bei 1,6.In a development of the invention, 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.

In Weiterbildung der Erfindung ist in einem Ansaugkanal stromaufwärts der Flüssigkeitsansaugöffnung eine Blende vorgesehen, wobei ein Verhältnis zwischen dem Durchmesser des zylindrischen Abschnitts der Injektionskammer und einem Durchmesser einer Durchgangsöffnung der Blende im Bereich von 1,5 bis 15, insbesondere zwischen 4 und 6, insbesondere bei 4,7, liegt.In a further development of the invention, 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.

In Weiterbildung der Erfindung liegt ein Verhältnis zwischen einer Fläche des zylindrischen Abschnitts der Injektionskammer und einer Fläche der Strömungsverbindung von dem Ringkanal zu der Injektionskammer im Bereich von 0,25 bis 2,5, insbesondere zwischen 0,5 und 1, insbesondere bei 0,76.In a development of the invention, 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 .

In Weiterbildung der Erfindung ist die Strömungsverbindung zwischen dem Ringkanal und der Injektionskammer in einem Abschnitt unmittelbar stromaufwärts der Mündung in die Injektionskammer zwischen zwei sich in Strömungsrichtung kegelförmig verjüngenden Wänden angeordnet.In a further development of the invention, 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.

Auf diese Weise lassen sich über den Umfang des Ringkanals und über den Umfang der Injektionskammer gesehen konstante Strömungsverhältnisse und Druckverhältnisse einstellen. Beispielsweise geht der Ringkanal mittels eines Ringspalts in die Injektionskammer über. Indem sich dieser Ringspalt zwischen dem Ringkanal und der Injektionskammer in Strömungsrichtung kegelförmig verjüngt, wird zu einem konstanten Mischungsverhältnis zwischen Treibmedium und Saugmedium auch bei Druckschwankungen des Treibmediums beigetragen.In this way, constant flow conditions and pressure conditions can be set over the circumference of the ring channel and over the circumference of the injection chamber. For example, the 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.

Das der Erfindung zugrunde liegende Problem wird auch mittels einer Sprühvorrichtung zum Versprühen eines Gemisches aus einem flüssigen Saugmedium und einem flüssigen Treibmedium mit einer erfindungsgemäßen Injektionsdüse gelöst.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.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Ansprüchen und der folgenden Beschreibung bevorzugter Ausführungsformen der Erfindung im Zusammenhang mit den Zeichnungen. Einzelmerkmale der unterschiedlichen dargestellten oder beschriebenen Ausführungsformen lassen sich dabei in beliebiger Weise kombinieren. Dies gilt auch für die Kombination von Einzelmerkmalen ohne weitere Einzelmerkmale, mit denen sie im Zusammenhang dargestellt sind. In den Zeichnungen zeigen:

Fig. 1
eine auseinandergezogene Darstellung einer erfindungsgemäßen Injektionsdüse,
Fig. 2
eine Schnittansicht der erfindungsgemäßen Injektionsdüse,
Fig. 3
eine vergrößerte Schnittansicht eines Injektorbauteils der erfindungsgemäßen Injektionsdüse,
Fig. 4
eine Ansicht eines erfindungsgemäßen Injektorbauteils gemäß einer weiteren Ausführungsform,
Fig. 5
einen Blendeneinsatz für das Injektorbauteil der Fig. 4,
Fig. 6
eine Schnittansicht des Blendeneinsatzes der Fig. 5 und
Fig. 7
das Injektorbauteil der Fig. 4 ohne den Blendeneinsatz.
Further features and advantages of the invention result from the claims and the following description of preferred embodiments of the invention in connection with the drawings. Individual features of the different illustrated or described embodiments can be combined in any way. This also applies to the combination of individual features without other individual features with which they are presented in connection. In the drawings show:
1
an exploded view of an injection nozzle according to the invention,
2
a sectional view of the injection nozzle according to the invention,
3
an enlarged sectional view of an injector component of the injection nozzle according to the invention,
4
a view of an injector component according to the invention according to a further embodiment,
figure 5
an aperture insert for the injector component 4 ,
6
a sectional view of the panel insert figure 5 and
7
the injector component 4 without the aperture insert.

Fig. 1 zeigt eine erfindungsgemäße Injektionsdüse 10 im auseinandergezogenen Zustand. Die Injektionsdüse 10 weist ein Injektorbauteil 12 und ein Austrittsdüsenbauteil 14 auf. Das Injektorbauteil 12 wird abschnittsweise in das Austrittsdüsenbauteil 14 gesteckt, vgl. Fig. 2, um einen betriebsfähigen Zustand der Injektordüse 12 zu erzielen. Die Injektionsdüse 12 wird dann in bekannter Weise in einen nicht dargestellten Düsenhalter einer Sprühvorrichtung eingesetzt, insbesondere einer landwirtschaftlichen Sprühvorrichtung. 1 shows an injection nozzle 10 according to the invention in the expanded state. 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.

Am Injektorbauteil 12 ist eine Blende 16 zu erkennen, die den Beginn eines Ansaugkanals in dem Injektorbauteil 12 markiert. Über die Blende 16 wird flüssiges Saugmedium aus einem Vorratstank angesaugt, mit einem flüssigen Treibmedium vermischt und ein Gemisch aus Saugmedium und Treibmedium wird an einem stromabwärts gelegenen Ende 18 einer Injektionskammer ausgegeben. Das Gemisch tritt dann in das Austrittsdüsenbauteil 14 ein, vgl. Fig. 2, und wird als Flachstrahl über eine Austrittsöffnung 20 einer Flachstrahldüse 22 ausgegeben. Anstelle der Flachstrahldüse 22 kann selbstverständlich eine im Wesentlichen beliebige Austrittsdüse an dem Austrittsdüsenbauteil 14 vorgesehen sein, beispielsweise eine Hohlkegeldüse oder Vollkegeldüse.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 . Instead of 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 zeigt eine Schnittansicht der Injektionsdüse 10 der Fig. 1 im zusammengebauten Zustand. Das Injektorbauteil 12 ist nun abschnittsweise in das Austrittsdüsenbauteil 14 eingesteckt worden. Am Ende 18 einer Injektionskammer 24 tritt ein Gemisch aus flüssigem Saugmedium und flüssigem Treibmedium in eine Austrittskammer 26 ein, an deren stromabwärts gelegenem Ende dann die Austrittsdüse 22 angeordnet ist. 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 . At the end 18 of an injection chamber 24, 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.

Im Injektorbauteil ist ein Treibdüsengehäuse 28 angeordnet, über das flüssiges Treibmedium, üblicherweise unter Druck stehendes Wasser, in die Injektionskammer 24 in Form eines Treibmediumstrahls eingebracht wird. Der Treibmediumstrahl ist bei der dargestellten Ausführungsform als Vollstrahl ausgebildet und tritt in die Injektionskammer 24 über eine Austrittsöffnung 30 des Treibdüsengehäuses 28 ein. Die Austrittsöffnung 30 weist einen Durchmesser dTR auf.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. In the illustrated embodiment, 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 .

Das Treibdüsengehäuse 28 ist von einem Ringkanal 32 umgeben. Ein Ansaugkanal 34 mündet an einer Flüssigkeitsansaugöffnung 36 in den Ringkanal 32. Ein in Fig. 2 linkes Ende des Ansaugkanals 34 wird in der Darstellung der Fig. 2 durch die Blende 16 begrenzt. Die Blende 16 weist eine Durchgangsöffnung 38 mit einem Durchmesser dR auf.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 .

Der Ringkanal 32 wird einseitig durch das Treibdüsengehäuse 28 begrenzt und steht in Strömungsverbindung mit der Injektionskammer 24. Bei der dargestellten Ausführungsform ist die Strömungsverbindung zwischen Ringkanal 32 und Injektionskammer 24 in Form eines Ringspalts 40 ausgebildet. Der Ringspalt 40 ist dadurch realisiert, dass der Ringkanal 32 zur Injektionskammer 24 einseitig offen ist. Eine Fläche des Ringspalts 40 auf Höhe des stromabwärts gelegenen Endes der Austrittsöffnung 30 wird mit AS bezeichnet. Im Rahmen der Erfindung kann die Strömungsverbindung zwischen Ringkanal 32 und Injektionskammer 24 auch anders gestaltet sein, beispielsweise mittels mehrere Kanäle.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. In the illustrated embodiment, 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 . Within the scope of the invention, 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.

Die Injektionskammer 24 weist in Strömungsrichtung gesehen vier Abschnitte auf.The injection chamber 24 has four sections viewed in the direction of flow.

Die Austrittsöffnung 30 der Treibdüse und der Ringspalt 40 münden in einen sich kegelförmig verjüngenden Abschnitt 42 der Injektionskammer, der allgemein kegelstumpfförmig ausgebildet ist. An den sich kegelförmig verjüngenden Abschnitt 42 schließt sich ein zylindrischer Abschnitt 44 an. An den zylindrischen Abschnitt 44 schließt sich ein erster, kegelförmig erweiternder Abschnitt 46 an, der einen ersten Kegelwinkel aufweist. An den ersten sich kegelförmig erweiternden Abschnitt 46 schließt sich ein zweiter kegelförmig erweiternder Abschnitt 48 an, der einen zweiten Kegelwinkel aufweist. Der zweite Kegelwinkel ist größer als der erste Kegelwinkel Der erste sich kegelförmig erweiternde Abschnitt 46 ist länger ausgebildet als der zweite sich kegelförmig erweiternde Abschnitt 48. Ein Kegelwinkel des ersten kegelförmigen Abschnitts liegt im Bereich zwischen 5° und 15° und insbesondere zwischen 5° und 10°. Ein Kegelwinkel des zweiten kegelförmigen Abschnitts 48 liegt im Bereich von 30° bis 40°. Der erste kegelförmige Abschnitt 46 weist in Strömungsrichtung gesehen eine Länge auf, die im Bereich des Zweifachen bis Vierfachen, insbesondere dem Dreifachen, der Länge des zweiten kegelförmigen Abschnitts 48 liegt. Die beiden aufeinanderfolgenden, sich kegelförmig erweiternden Abschnitte 46, 48 tragen zu einem konstanten Mischungsverhältnis zwischen dem flüssigen Treibmedium und dem flüssigen Saugmedium auch bei Druckschwankungen des Treibmediums bei.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.

Ein mittels der Treibdüse erzeugter und aus der Austrittsöffnung 30 des Treibdüsengehäuses 28 austretender Treibmediumstrahl tritt in den sich kegelförmig verjüngenden Abschnitt 42 der Injektionskammer 24 ein und erzeugt mittels des sogenannten Venturi-Effekts einen Unterdruck in der Injektionskammer 24. Infolgedessen wird das flüssige Saugmedium über die Durchgangsöffnung 38 der Blende 16 in den Ansaugkanal 34 gesaugt und tritt über die Flüssigkeitsansaugöffnung 36 in den Ringkanal 32 ein. Das Saugmedium verteilt sich im Ringkanal 32 und tritt dann, über den Umfang des Treibdüsengehäuses 28 gesehen gleichmäßig verteilt, durch den Ringspalt 40 in die Injektionskammer 24 ein. Anstelle des Ringspalts 40 können beispielsweise auch mehrere Durchgangskanäle zwischen dem Ringkanal 32 und der Injektionskammer 24 vorgesehen sein.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 . Instead of 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 .

Der Treibmediumstrahl tritt zusammen mit dem angesaugten Saugmedium in den zylindrischen Abschnitt 44 und dann in die beiden sich kegelförmig erweiternden Abschnitte 46, 48 der Injektionskammer 24 ein. Bereits im sich kegelförmig verjüngenden Abschnitt 42 der Injektionskammer 24 beginnt der Treibmediumstrahl aufzureißen und es erfolgt eine Vermischung zwischen dem Treibmediumstrahl und dem angesaugten Saugmedium. Am stromabwärts gelegenen Ende 18 der Injektionskammer 24 tritt dadurch ein Gemisch aus Saugmedium und Treibmedium in die Austrittskammer 26 ein. In der Austrittskammer erfolgt eine weitere Vergleichmäßigung der Mischung zwischen dem Treibmedium und dem Saugmedium. Aus der Austrittsdüse 22 tritt dann bei der dargestellten Ausführungsform ein Flachstrahl aus einem Gemisch zwischen Treibmedium und Saugmedium aus. Wie ausgeführt wurde, kann durch die spezielle Gestaltung der Injektionsdüse 10 ein konstantes Mischungsverhältnis zwischen Treibmedium und Saugmedium auch bei Druckschwankungen des Treibmediums sichergestellt werden. Die erfindungsgemäße Injektionsdüse 10 ist dadurch in besonderer Weise für die Anwendung in der Landtechnik geeignet. Die Austrittsdüse 22 kann im Rahmen der Erfindung auch als Vollkegeldüse oder Hohlkegeldüse ausgebildet sein.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. Already in the conically tapering section 42 of the injection chamber 24, the jet of propellant medium begins to break up and mixing occurs between the jet of propellant medium and the sucked-in suction medium. As a result, at the downstream end 18 of the injection chamber 24 , a mixture of suction medium and propellant medium enters the outlet chamber 26 . In the outlet chamber, the mixture between the propellant medium and the suction medium is further evened out. In the illustrated embodiment, a flat jet consisting of a mixture of propellant medium and suction medium then emerges from the outlet nozzle 22 . As has been explained, 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. Within the scope of the invention, the outlet nozzle 22 can also be designed as a full cone nozzle or hollow cone nozzle.

Fig. 3 zeigt eine vergrößerte Darstellung des Injektorbauteils 12 der Injektionsdüse 10 der Fig. 1 und 2. 3 shows an enlarged representation of the injector component 12 of the injection nozzle 10 of FIG Figures 1 and 2 .

Ein Durchmesser der Durchgangsöffnung der Blende 16 ist mit dR bezeichnet. Ein Durchmesser der Austrittsöffnung 44 des Treibdüsengehäuses 28 ist mit dTR bezeichnet. Eine Länge des sich kegelförmig verjüngenden Abschnitts 42 der Injektionskammer 24 ist in Strömungsrichtung gesehen mit h bezeichnet. Ein Durchmesser des zylindrischen Abschnitts 44 der Injektionskammer 24 ist mit dDH bezeichnet und eine Querschnittsfläche des zylindrischen Abschnitts 44 ist mit ADH bezeichnet.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 .

Eine Fläche des Ringspalts 40 am stromabwärts gelegenen Ende der Strömungsverbindung zwischen dem Ringkanal 32 und der Injektionskammer 24 ist mit AS bezeichnet. Ein Kegelwinkel des ersten sich kegelförmig erweiternden Abschnitts 46 der Injektionskammer 24 ist mit α1 bezeichnet und ein Kegelwinkel des zweiten sich kegelförmig erweiternden Abschnitts 48 der Injektionskammer 24 ist mit α2 bezeichnet. Eine Länge des zylindrischen Abschnitts 44 der Injektionskammer 24 ist mit L0 bezeichnet. Eine Länge des ersten, sich kegelförmig erweiternden Abschnitts 46 ist mit L1 und eine Länge des zweiten, sich kegelförmig erweiternden Abschnitts 48 ist mit L2 bezeichnet.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 α1 and a cone angle of the second flared portion 48 of the injection chamber 24 is denoted by α2. 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 .

L0 ist deutlich kleiner als h und beträgt bei der dargestellten Ausführungsform nur etwa ein Drittel von h. L1 und L2 sind wesentlich größer als L0. L1 ist größer als L2 und L1 ist etwa doppelt so groß bis viermal so groß wie L2. α1 liegt im Bereich von 5° bis 15°, insbesondere zwischen 5° und 10°. α2 liegt im Bereich von 30° bis 40°.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 . α1 is in the range from 5° to 15°, in particular between 5° and 10°. α2 is in the range of 30° to 40°.

Ein Verhältnis dDH/h zwischen dem Durchmesser dDH des zylindrischen Abschnitts 44 der Injektionskammer 24 und der Länge h des sich in Strömungsrichtung kegelförmig verjüngenden Abschnitts 42 der Injektionskammer 24 zwischen der Austrittsöffnung 30 und dem Beginn des zylindrischen Abschnitts 44 liegt im Bereich von 0,5 bis 5, insbesondere zwischen 1 und 2, insbesondere bei 1,4.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.

Ein Verhältnis dDH/dTR zwischen dem Durchmesser dDH des zylindrischen Abschnitts 44 der Injektionskammer und einem Durchmesser dTR der Austrittsöffnung 30 der Treibdüse liegt im Bereich von 1 bis 3, insbesondere zwischen 1,5 und 1,7, insbesondere bei 1,6.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.

Ein Verhältnis dDH/dR zwischen dem Durchmesser dDH des zylindrischen Abschnitts 44 der Injektionskammer 24 und einem Durchmesser dR einer Durchgangsöffnung der Blende 16 liegt im Bereich von 1,5 bis 15, insbesondere zwischen 4 und 6, insbesondere bei 4,7.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 .

Ein Verhältnis ADH/AS zwischen einer Fläche ADH des zylindrischen Abschnitts 44 der Injektionskammer 24 und einer Fläche AS der Strömungsverbindung von dem Ringkanal 32 zu der Injektionskammer 24, speziell einer Fläche AS des Ringspalts 40, liegt im Bereich von 0,25 bis 2,5, insbesondere zwischen 0,5 und 1, insbesondere bei 0,76.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.

Die vorstehend erläuterten Verhältnisse und auch die vorstehend erläuterten Längen und Durchmesser sowie Winkel tragen zu einem konstanten Mischungsverhältnis zwischen Saugmedium und Treibmedium bei, auch wenn Druckschwankungen des Treibmediums auftreten. Die erfindungsgemäße Injektionsdüse ist dadurch in besonderer Weise für die Anwendung in der Landtechnik geeignet.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 zeigt ein Injektorbauteil 112 gemäß einer weiteren Ausführungsform der Erfindung. Das Injektorbauteil 112 ist sehr ähnlich zum Injektorbauteil 12 der Fig. 1 bis 3 aufgebaut, so dass identische Elemente entweder nicht erläutert oder mit den gleichen Bezugszeichen versehen werden. Das Injektorbauteil 112 kann anstelle des Injektorbauteils 12 der Fig. 1 bis 3 in das in den Fig. 1 bis 3 dargestellte Austrittsdüsenbauteil 14 eingesetzt werden. 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.

Das Injektorbauteil 112 weist einen modularen Blendeneinsatz 114 auf. Der Blendeneinsatz 114 weist die Blende 16 und einen Abschnitt des Ansaugkanals auf. Der Ansaugkanal wird dann in dem Injektorbauteil 112 fortgesetzt.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 .

Fig. 5 zeigt den Blendeneinsatz 114 von schräg unten und Fig. 6 den Blendeneinsatz 114 in einer Schnittansicht. Anhand der Fig. 6 ist zu erkennen, dass der Blendeneinsatz 114 einen Abschnitt 34A des Ansaugkanals definiert. Der übrige Abschnitt 34B des Ansaugkanals, der dann zu dem Ringkanal um die Treibdüse führt, vgl. Fig. 2, ist hingegen in dem Injektorbauteil 112 ausgebildet. 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 .

Der Blendeneinsatz 114 weist an seinem stromaufwärts gelegenen Ende des Ansaugkanals 34A die Blende 16 auf, die die Restriktorbohrung 38 definiert. Je nach Strömungswiderstand der Restriktorbohrung 38, also abhängig vom Durchmesser der Restriktorbohrung 38 und abhängig von der Länge der Restriktorbohrung 38, ändert sich der Strömungswiderstand der Restriktorbohrung 38 und somit kann ein Verhältnis zwischen der Menge des angesaugten Saugmediums und der Menge des Treibmediums eingestellt werden.The orifice insert 114 has the orifice 16 defining the restrictor bore 38 at its upstream end of the intake passage 34A. Depending on the flow resistance of the restrictor bore 38, i.e. depending on the diameter of the restrictor bore 38 and depending on the length of the restrictor bore 38, 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.

In Fig. 5 ist zu erkennen, dass der Abschnitt 34A des Ansaugkanals an seinem stromabwärts gelegenen Ende mittels eines Stutzens 116 gebildet ist, der über eine Anschlagfläche 118 des Blendeneinsatzes 114 hinausragt. Der Stutzen 116 ist dafür vorgesehen, vgl. Fig. 7, in eine passende Ausnehmung 120 im Injektorbauteil 112 eingeschoben zu werden. Durch einfaches Einschieben des Blendeneinsatzes 114 in die Schiebeführung des Injektorbauteils 112, wobei am Ende der Schiebebewegung der Zapfen 116 in die Ausnehmung 120 eindringt, wird zum einen der Abschnitt 34A dicht mit dem Abschnitt 34B des Ansaugkanals verbunden. Dies wird dadurch erreicht, dass der Stutzen 116 mit einem umlaufenden Vorsprung 122 versehen ist, der in eine passende umlaufende Nut 124 in der Ausnehmung 120 einrasten kann. Beispielsweise ist der umlaufende Vorsprung 122 mittels eines Dichtrings gebildet, so dass nach dem Einrasten des Vorsprungs 122 in die Nut 124 die beiden Abschnitte 34A, 34B des Ansaugkanals dicht miteinander verbunden sind. An die Dichtheit dieser Verbindung werden dabei nur geringe Anforderungen gestellt, da der Ansaugkanal 34 und somit auch die Verbindung der Abschnitte 34A, 34B im Betrieb der Injektionsdüse unter Unterdruck steht.In figure 5 It can be seen that 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 . By simply pushing the screen insert 114 into the sliding guide of the injector component 112, with the pin 116 penetrating into the recess 120 at the end of the sliding movement, the section 34A is connected tightly to the section 34B of the intake duct. This is achieved in that the connecting piece 116 is provided with a peripheral projection 122 which can snap into a matching peripheral groove 124 in the recess 120 . For example, 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.

Der Vorsprung 122, der im montierten Zustand des Blendeneinsatzes 114 in die Nut 124 eingerastet ist, sorgt auch für eine mechanische Sicherung des Blendeneinsatzes 114 an dem Injektorbauteil 112.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.

Die Schiebeführung ist am Injektorbauteil 112 mittels zweier leistenförmiger Vorsprünge 126 ausgebildet, die in eine Ausnehmung am Injektorbauteil 112 hineinragen, die sich bis zum Rand des Injektorbauteils erstreckt. Dadurch ist zwischen den leistenförmigen Vorsprüngen 126 und einem Grund 128 der Ausnehmung an beiden Seiten jeweils ein Hinterschnitt gebildet.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. As a result, an undercut is formed on both sides between the strip-shaped projections 126 and a base 128 of the recess.

Der Blendeneinsatz 114 weist zu beiden Seiten ebenfalls leistenförmige Vorsprünge 130 auf, die auf die Länge, Höhe und Breite des Hinterschnitts in der Ausnehmung abgestimmt sind. Durch einfaches Einschieben der leistenförmigen Vorsprünge 130 in die Hinterschnitte am Injektorbauteil 112 wird der Blendeneinsatz dadurch am Injektorbauteil 112 geführt. Der Blendeneinsatz 114 kann entlang der Schiebeführung in das Injektorbauteil 112 eingeschoben werden, bis die Stirnfläche 118 des Blendeneinsatzes 114 an der stirnseitigen Begrenzung 132 der Ausnehmung im Injektorbauteil 112 anschlägt. Dieser Zustand ist in Fig. 4 dargestellt. Sobald der Blendeneinsatz 114 seine in Fig. 4 dargestellte Endposition erreicht hat, ist auch der Vorsprung 122 am Stutzen 116 des Blendeneinsatzes 114 in die Nut 124 in der Ausnehmung 120 des Injektorbauteils 112 eingerastet.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. By simply pushing the strip-shaped projections 130 into the undercuts on the injector component 112, the screen insert is thereby guided on the injector component 112. 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. As soon as the aperture insert 114 is in 4 has reached the end position 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 .

Um den Blendeneinsatz 114 wechseln zu können, also aus der in Fig. 4 dargestellten Position entfernen zu können, wird der Rand einer Münze oder die Klinge eines Schraubendrehers in eine rechteckförmige Ausnehmung 134 an der Oberseite des Injektorbauteils 112 eingeführt. Eine Begrenzung dieser Ausnehmung 134 bildet die Stirnfläche 118 des Blendeneinsatzes 114. Durch Verdrehen der Münze oder der Klinge des Schraubendrehers kann dadurch der Blendeneinsatz 114 ein Stück weit entlang der Schiebeführung in radialer Richtung vom Injektorbauteil 112 wegbewegt werden. Diese Bewegung muss nur so weit erfolgen, bis der umlaufende Vorsprung 122 am Stutzen 116 des Blendeneinsatzes 114 aus der Nut 124 der Ausnehmung 120 im Injektorbauteil 112 herausbewegt worden ist. Die Rastverbindung zwischen Blendeneinsatz 114 und Injektorbauteil 112 ist dadurch gelöst. Der Blendeneinsatz 114 kann dann leicht von Hand entlang der Schiebeführung vom Injektorbauteil 112 entfernt werden. Der Blendeneinsatz 114 kann dann beispielsweise gegen einen anderen Blendeneinsatz ausgewechselt werden, der sich von dem Blendeneinsatz 114 lediglich durch eine andere Abmessung der Restriktorbohrung 38 der Blende 16 unterscheidet. Auf diese Weise kann die erfindungsgemäße Injektionsdüse in einfacher Weise so angepasst werden, dass unterschiedliche Verhältnisse der Menge an Saugmedium und der Menge an Treibmedium eingestellt werden können.In order to be able to change the screen insert 114, i.e. from the in 4 To be able to remove the position shown, 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. By turning the coin or the blade of the screwdriver, the screen insert 114 can be moved a little far along the sliding guide in the radial direction away from the injector component 112. This movement only has to take place until the peripheral projection 122 on the connecting piece 116 of the screen insert 114 has been moved out of the groove 124 of the recess 120 in the injector component 112 . 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. In this way, 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.

Claims (17)

  1. Injection nozzle (10) for a spray device for drawing in a fluid suction medium by means of a fluid propellant which is under excess pressure and for spraying an admixture of the suction medium and the propellant, having a nozzle housing, having an injection chamber (24) which is arranged in the nozzle housing, having a jet nozzle (28) which opens in the injection chamber (24) for producing a propellant jet which is introduced into the injection chamber (24), and having a fluid suction opening (36) for the fluid suction medium, wherein the fluid suction opening (36) opens in an annular channel (32) which has a flow connection to the injection chamber (24), characterized in that at least one pin diaphragm (16) is provided in a suction channel (34) upstream of the fluid suction opening (36), in that the nozzle housing is provided with a pin diaphragm insert (114) which has a portion (34A) of the suction channel (34) for drawing in the fluid suction medium (16) and the pin diaphragm (16) and which is releasably arranged on the nozzle housing, in that the pin diaphragm insert (114) is connected to the nozzle housing by means of a sliding guide, in that the pin diaphragm insert (114) is releasably arranged on an injector component (112) which has at least the jet nozzle (28) and the injection chamber (24).
  2. Injection nozzle according to Claim 1, characterized in that the annular channel is open at one side towards the injection chamber so that the flow connection to the injection chamber is formed by means of an annular gap.
  3. Injection nozzle according to Claim 1 or 2, characterized in that the fluid suction opening opens in the annular channel upstream of the outlet opening of the jet nozzle.
  4. Injection nozzle according to at least one of the preceding claims, characterized in that the flow connection from the annular channel to the injection chamber opens in the injection chamber at the height of the outlet opening of the jet nozzle.
  5. Injection nozzle according to any one of the preceding claims, characterized in that the annular channel is delimited at least at one side by a jet nozzle housing of the jet nozzle.
  6. Injection nozzle according to at least one of the preceding claims, characterized in that the injection chamber downstream of the outlet opening of the jet nozzle has a first conical portion which expands in the flow direction and has a second conical portion which adjoins the first conical portion and which expands in the flow direction, wherein the second conical portion has a larger cone angle than the first conical portion.
  7. Injection nozzle according to Claim 6, characterized in that a cone angle of the first conical portion is in the range from 5° to 15°, in particular between 5° and 10°.
  8. Injection nozzle according to Claim 6 or 7, characterized in that a cone angle of the second conical portion is in the range from 30° to 40°.
  9. Injection nozzle according to Claim 6, 7 or 8, characterized in that the first conical portion has when viewed in the flow direction a length which is in the range from two to four times, in particular three times, the length of the second conical portion.
  10. Injection nozzle according to at least one of the preceding claims, characterized in that an outlet opening of the jet nozzle opens in a portion of the injection chamber which tapers in a conical manner in the flow direction.
  11. Injection nozzle according to at least one of the preceding claims, characterized in that a cylindrical portion of the injection chamber is arranged upstream of the first conical portion, wherein the first conical portion adjoins the cylindrical portion.
  12. Injection nozzle according to Claim 10 and 11, characterized in that a ratio (dDH/h) between the diameter (dDH) of the cylindrical portion of the injection chamber and a length (h) of the portion of the injection chamber which tapers in a conical manner in a flow direction between the outlet opening of the jet nozzle and the beginning of the cylindrical portion is in the range from 0.5 to 5, in particular between 1 and 2, in particular 1.4.
  13. Injection nozzle according to Claim 11 or 12, characterized in that a ratio (dDH/dTR) between the diameter (dDH) of the cylindrical portion of the injection chamber and a diameter (dTR) of the outlet opening of the jet nozzle is in the range from 1 to 3, in particular between 1.5 and 1.7, in particular 1.6.
  14. Injection nozzle according to Claim 11, 12 or 13, characterized in that a pin diaphragm is provided in a suction channel upstream of the fluid suction opening, wherein a ratio (dDH/dTR) between the diameter (dDH) of the cylindrical portion of the injection chamber and a diameter (dTR) of a through-opening of the pin diaphragm is in the range from 1.5 to 15, in particular between 4 and 6, in particular 4.7.
  15. Injection nozzle according to any one of Claims 11 to 14, characterized in that a ratio (ADH/AS) between a surface-area (ADH) of the cylindrical portion of the injection chamber and a surface-area (AS) of the flow connection from the annular 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.
  16. Injection nozzle according to at least one of the preceding claims, characterized in that the flow connection between the annular channel and the injection chamber is arranged in a portion directly upstream of the opening in the injection chamber between two walls which taper in a conical manner in the flow direction.
  17. Spray device for spraying an admixture of a fluid suction medium and a fluid propellant, characterized by at least one injection nozzle according to any one of the preceding claims.
EP20190177.4A 2019-09-06 2020-08-10 Spray device and injection nozzle for a spray device Active EP3804861B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019213569.2A DE102019213569A1 (en) 2019-09-06 2019-09-06 Injection nozzle for a spray device and spray device

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

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

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FR3107659B1 (en) * 2020-02-28 2022-06-24 Solcera Flat fan, low drift spray nozzle.
DE102021203755A1 (en) 2021-04-15 2022-10-20 Volkswagen Aktiengesellschaft Jet pump, in particular jet pump for a fuel cell application

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Also Published As

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

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