EP1902774A1 - Dispositif de mélange, dispositif de pulvérisation pour la protection des plantes et procédé de fonctionnement d'un dispositif de pulvérisation - Google Patents

Dispositif de mélange, dispositif de pulvérisation pour la protection des plantes et procédé de fonctionnement d'un dispositif de pulvérisation Download PDF

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Publication number
EP1902774A1
EP1902774A1 EP07018248A EP07018248A EP1902774A1 EP 1902774 A1 EP1902774 A1 EP 1902774A1 EP 07018248 A EP07018248 A EP 07018248A EP 07018248 A EP07018248 A EP 07018248A EP 1902774 A1 EP1902774 A1 EP 1902774A1
Authority
EP
European Patent Office
Prior art keywords
line
mixing
mixing chamber
main flow
carrier liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07018248A
Other languages
German (de)
English (en)
Inventor
Wolf-Dieter Wichmann
Frank Gessler
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
Original Assignee
Lechler GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lechler GmbH filed Critical Lechler GmbH
Publication of EP1902774A1 publication Critical patent/EP1902774A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
    • B01F23/451—Mixing liquids with liquids; Emulsifying using flow mixing by injecting one liquid into another
    • 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
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
    • 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
    • B01F25/32—Injector mixers wherein the additional components are added in a by-pass of the main flow
    • 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
    • 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/10—Maintenance of mixers
    • B01F35/145—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means

Definitions

  • the invention relates to a mixing device for mixing a carrier liquid with at least one active ingredient, in particular for a field sprayer for crop protection, with a main flow line, an active ingredient feed line and a mixing chamber.
  • the invention also relates to a spraying device for spraying tips for crop protection. Furthermore, the invention relates to a method for operating a spray device for crop protection.
  • Sprays in agriculture or plant protection technology are made from active ingredients and carrier liquid, wherein the ratio of active ingredient to carrier liquid can vary extremely. For example, drug levels of about 200 ml to about 6 liters per hectare to be sprayed are used. Should the active ingredients and the Carrier liquid not mixed as usual today before the treatment, ie the spraying, in a container, but are dosed directly during the treatment, the supply of these agents must be carried out in a flow of the carrier liquid, which in turn also has a very broad spectrum. This is in spatial cultures, for example, at 150 to 450 I per hectare to be treated.
  • the momentarily flowing volume flow of the carrier liquid during spraying is, in addition to the application rate per hectare, also from the driving speed and the number of used sections or spray nozzles of the crop protection syringe, a spectrum of the volume flow of the carrier liquid, for example in a range of 8 l / min to 250 l / min.
  • the good mixing of the active ingredient and the carrier liquid is a difficult requirement if the entire area to be covered is considered.
  • the ratio of active ingredient to carrier liquid vary greatly between different applications, in the same application beyond the volume flow of spent carrier liquid can vary widely.
  • Known mixing chambers for mixing two or more liquid components have the disadvantage that they work reliably only in a limited range of volume flows of the carrier liquid flow and only from a certain amount of supplied active ingredient.
  • the known mixing chambers therefore only work reliably above a certain frequency of the metering pulses.
  • the size of the mixing chambers must in turn be designed for the volume flow to be mixed, so that high volume flows also require correspondingly large mixing chambers or complex stirring systems.
  • the known mixing chambers are therefore very limited.
  • the invention provides a compact mixing device for mixing a carrier liquid with at least one active substance, with which a wide range of active ingredient / carrier liquid ratio and a wide range of volume flow can be covered with reliable mixing.
  • a mixing device for mixing carrier liquid with at least one active ingredient, in particular for a sprayer for crop protection, an active ingredient feed line and a mixing chamber is provided, wherein the mixing chamber is arranged in a branching off from the main flow line and re-opening into this bypass line.
  • the mixing chamber is not arranged in the main flow line, but in a bypass line, the at least one active ingredient and the carrier liquid can be mixed in a mixing chamber, which is tuned to the side stream, which does not fluctuate or substantially less than the main flow in the main power line.
  • the mixing chamber can be optimally tuned to the secondary flow and run relatively small. If the added active ingredients, for example pesticides, are mixed sufficiently reliably with the secondary stream of the carrier liquid, for example water, the secondary stream is added again as a continuously flowing component to the main stream and mixed in in a customary manner, for example by means of a known mixer.
  • the mixing device according to the invention can ensure a reliable mixture of active substance and carrier liquid especially when the active substance or the active ingredients are added in pulses.
  • the drug feed line opens into the bypass line or into the mixing chamber.
  • a throttle is arranged in the main flow line downstream of the branch of the bypass line and upstream of the junction of the bypass line.
  • a throttle for example, a throttle valve or a check valve may be provided.
  • the throttle determines the pressure applied across the mixing chamber. With this pressure or this pressure difference, the mixing chamber located in the bypass flow is then flown and operated, for example, a hydraulic agitator.
  • the complete main flow is diverted into the bypass line, as long as the opening pressure of the check valve is not exceeded in the main flow line. If the opening pressure of the check valve is exceeded when the main flow continues to increase, a pressure difference corresponding to the opening pressure of the check valve is still maintained via the bypass flow line and as a result, part of the main flow flows into the bypass duct, the other part continues to flow through the check valve in the main flow duct.
  • the check valve in the main flow also has an increasing pressure difference over the bypass line with increasing volume flow, so that the size of the secondary flow always depends on the size of the main flow.
  • the resulting increase in the volume flow in the bypass line can be accepted, as this, for example, a stirrer in the mixing chamber is more strongly flowed and thus a proportionally higher stirring power almost compensates for the faster flow through the mixing chamber.
  • a further mixer is provided in the main flow line downstream of the junction of the bypass line.
  • means are provided in order to guide the complete main flow or only part of the main flow through the bypass flow, depending on a size of a main flow flowing through the main flow line.
  • the complete main flow is expediently passed through the bypass flow line, and only when the main flow exceeds a predefined size, a part of the main flow is diverted parallel to the secondary flow through the main flow line.
  • control of the main flow and the secondary flow can be effected automatically by the throttling action described, for example by means of the check valve described, or also by means of a controlled or regulated valve.
  • means are provided to define a size of the secondary flow shown from the main flow line and / or to limit it to a maximum value.
  • a Injektorrhakdüse for defining the branched off from the main flow line side stream and for limiting this side stream to a maximum value, for example a Injektorrhakdüse be used, which is also used as a hydraulic agitator.
  • the nozzle cross-section of the injector stirring nozzle determines, depending on the pressure difference between the diversion of the secondary flow from the main flow line and the introduction of the secondary flow into the mixing chamber whose size, ie the flow rate of the secondary flow.
  • bypass line is connected to a arranged in the mixing chamber injector-stirring nozzle.
  • a bypass line branching off from the bypass line upstream of the mixing chamber and opening into the mixing chamber is provided.
  • a switchable bypass valve is provided in the bypass line.
  • bypass line which bypasses, for example, an injector-stirring nozzle at the entrance of the mixing chamber
  • the mixing chamber can be flushed, for example in a rinsing operation with very large amounts of liquid.
  • very large amounts of by-pass streams can also be introduced into the mixing chamber during spraying operation via the bypass line, for example, if only smaller demands are placed on the uniformity of thorough mixing.
  • the bypass valve would be opened, in normal mixing operation, however, the switchable bypass valve is closed.
  • a spray device for spraying spraying agents for crop protection in which at least one metering pump and a mixing device according to the invention are provided.
  • the metering pump metered the at least one active ingredient in a pulse shape in the bypass line upstream of the mixing chamber or in the mixing chamber.
  • the metering of active ingredients in liquid pulses each having the same amount of liquid has the advantage that a very precise metering is possible, wherein different amounts of active ingredient are accomplished by simply increasing or decreasing the pulse frequency.
  • a carrier liquid in a main flow line Conveying a carrier liquid in a main flow line, depending on a size of a carrier liquid stream in the main flow line and / or an amount of active ingredient to be metered into the carrier liquid stream, branching off a secondary stream from the carrier liquid stream, continuously mixing the amount of active ingredient to be metered with the side stream and optionally mixing the side stream with the remaining carrier liquid stream in the main power line.
  • the method according to the invention makes it possible to reliably mix and homogenize directly metered active substances into a very widely varying carrier liquid flow.
  • the secondary flow and / or to limit it to a maximum value.
  • the dosing of the active ingredient in the secondary stream is pulsed.
  • the secondary flow mixing chamber By adjusting the secondary flow and limiting the secondary flow to a maximum value, which can be achieved for example by a nozzle or throttle in the secondary flow, it is ensured that in the secondary flow mixing chamber only flows are mixed, which are within a normal working range of the mixing chamber.
  • another mixer is required downstream of the junction of the secondary flow into the remaining main flow.
  • the mixing of the already mixed, continuous secondary flow with the remaining main flow is comparatively uncritical and can be achieved reliably with known mixers.
  • FIG. 1 shows a mixing device 10 according to the invention in an exemplary preferred embodiment, with a main flow line 12, a branching off from the main flow line 12 and back into this branching bypass line 14, wherein the bypass line 14 leads to a mixing chamber 16 and from this from back to the main power line 12 goes.
  • a drug delivery line 18 opens shortly before the confluence of the bypass line 14 in the mixing chamber 16, in the bypass line 14.
  • the active ingredient is metered in pulses via the active ingredient line 18 in the bypass line 14, which is symbolized by the dashed representation of the drug supply line 18.
  • the dashed representation is intended to indicate only that from the active ingredient supply line 18 in the bypass line 14 no continuous flow of active ingredient is introduced, but this drug stream flows in a pulsed manner.
  • the bypass duct 14 opens into an injector stirring nozzle 20 which is arranged within the mixing chamber 16 and, as indicated by arrows within the mixing chamber 16, ensures a thorough turbulence and thorough mixing of the liquid in the mixing chamber 16.
  • injector stirring nozzle 20 which is arranged within the mixing chamber 16 and, as indicated by arrows within the mixing chamber 16, ensures a thorough turbulence and thorough mixing of the liquid in the mixing chamber 16.
  • At the top in Fig. 1 bottom surface of the mixing chamber 16 in the center of the injector-stirring nozzle 20 is disposed radially outwardly an outlet 22, from which the downstream of the mixing chamber 16 lying portion 14b of the bypass line 14 goes out and back into the Main power line 12 opens.
  • the outlet 22 is always arranged in the opposite flow direction to the injector-stirring nozzle 20, so that from the injector-stirring nozzle 20 to the outlet 22 so a flow reversal must take place.
  • a check valve 24 is arranged between the branch of the bypass line 14 from the main flow line 12 and the junction of the Secondary flow line 14 in the main flow line 12.
  • a mixer 26 is optionally provided, which ensures thorough mixing of the secondary flow from the bypass duct 14 with the main flow in the main flow line 12.
  • the main flow line 12 is divided into a portion 12 a upstream of the check valve 24 and a portion 12 b downstream of the check valve 24.
  • the bypass duct 14 has two sections 14a, 14b, with the section 14a upstream of the mixing chamber 16 and the section 14b downstream of the mixing chamber.
  • the portion 14a of the bypass duct thus branches off from the portion 12a of the main flow line 12 and opens into the mixing chamber 16.
  • the portion 14b of the bypass duct 14 emanates from the mixing chamber 16 and opens into the portion 12b of the main flow line 12 downstream of the check valve 24th
  • the check valve 24 has a predefined opening pressure.
  • the check valve 24 in the main flow line 12 When a volumetric flow flows in the main flow line 12, the check valve 24 in the main flow line 12 generates a pressure drop or a pressure difference between the sections 12a upstream of the check valve 24 and the section 12b downstream of the check valve.
  • This pressure difference generated by the check valve 24 causes the flow through the arranged in the bypass mixing chamber 16 and operates in the illustrated embodiment, the hydraulic agitator in the form of the injector-stirring nozzle 20.
  • this opening pressure is not exceeded by the main flow in section 12a of the main power line 12, the complete main flow is diverted from the main flow line 12 into the section 14a of the bypass line 14.
  • the mixing device 10 further has a bypass valve 28, which can shut off or release a bypass line 30.
  • the bypass line 30 branches off upstream of the junction of the active ingredient feed line 18 from the portion 14 a of the bypass line and opens at an inlet 32 directly into the mixing chamber 16 Injection process to accelerate the concentration reduction and the flushing of the entire mixing device 10, the bypass valve 28 is opened and carrier liquid flows not only through the injector-stirring nozzle 20, but also via the inlet 32 into the mixing chamber 16 a. Within a short time, the mixing chamber 16 can thereby be reliably cleaned of active substance residues.
  • the bypass valve 28 is closed and is thus in the position shown in Fig. 1.
  • the bypass valve 28 can be controlled pneumatically, for example.
  • FIG. 2 shows a spray device 40 according to the invention with the mixing device 10 of FIG. 1.
  • the section 12a of the main flow line 12 is fed with carrier liquid from a carrier liquid tank 42, wherein a carrier liquid pump, not shown, is provided. Downstream of the mixer 26, the main flow line section 12b leads to a spray bar 44 having a plurality of spray nozzles.
  • the drug delivery line 18 is fed by a metering pump 46, the active ingredient is supplied from a drug reservoir 48.
  • the metering pump 46 outputs pulses of liquid each having the same amount of liquid and operates under the control of a control unit 50.
  • the control unit 50 receives, inter alia, information about the flowing in the main flow line 12a carrier fluid quantity and ensures by appropriate adjustment of the pulse frequency for the metering pump 46 sure that a preset drug / Carrier liquid ratio is maintained.
  • the mixing device 10 according to the invention By arranging the mixing device 10 according to the invention in a bypass branch of the spray device 40, it can be ensured that a satisfactory mixing of active ingredient and carrier liquid over an extremely wide range of active ingredient per hectare surface to be sprayed is ensured even with pulsed metering of at least one active substance and carrier liquid flow.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Catching Or Destruction (AREA)
EP07018248A 2006-09-19 2007-09-18 Dispositif de mélange, dispositif de pulvérisation pour la protection des plantes et procédé de fonctionnement d'un dispositif de pulvérisation Withdrawn EP1902774A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006045449A DE102006045449A1 (de) 2006-09-19 2006-09-19 Mischvorrichtung, Spritzvorrichtung für den Pflanzenschutz und Verfahren zum Betreiben einer Spritzvorrichtung

Publications (1)

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EP1902774A1 true EP1902774A1 (fr) 2008-03-26

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EP07018248A Withdrawn EP1902774A1 (fr) 2006-09-19 2007-09-18 Dispositif de mélange, dispositif de pulvérisation pour la protection des plantes et procédé de fonctionnement d'un dispositif de pulvérisation

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EP (1) EP1902774A1 (fr)
DE (1) DE102006045449A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104541731A (zh) * 2015-02-12 2015-04-29 张江龙 水肥一体机
CN106807579A (zh) * 2017-02-22 2017-06-09 南通市广益机电有限责任公司 用于喷雾机药剂存储箱的搅拌装置
CN109430217A (zh) * 2018-12-12 2019-03-08 济南大学 一种喷雾机拌药与供药***及方法
US11096385B2 (en) * 2011-12-14 2021-08-24 Basf Se System and method for applying liquid mixtures

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010055353A1 (de) 2010-12-20 2012-06-21 ALKO Fördertechnik GmbH Einrichtung an Aufzuganlagen zum Schutz von Personal in den Schachtenden

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181797A (en) 1963-04-03 1965-05-04 Hayes Spray Gun Company Mixing apparatus having plural eductors
FR2545685A1 (fr) 1983-05-13 1984-11-16 Rhone Poulenc Agrochimie Dispositif d'incorporation de produits dans un systeme d'irrigation
US5000844A (en) * 1988-10-20 1991-03-19 Philippe Cloup Device for injecting additive products into a liquid
FR2688709A1 (fr) * 1992-03-23 1993-09-24 Schlumberger Cie Dowell Melangeur d'additifs liquides en continu dans un fluide.
US20050124734A1 (en) * 2003-12-06 2005-06-09 Bayer Materialscience Ag Process for the introduction of additives, into polymer melts
US20050173326A1 (en) 2004-02-09 2005-08-11 Eco Oxygen Technologies, Llc Superoxygenation of raw wastewater for odor/corrosion control

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH559574A5 (en) * 1973-10-18 1975-03-14 Maier Kurt Continuously metering detergent into running water - for washing cars using jet induction and mixing
US3968932A (en) * 1975-11-03 1976-07-13 Ardean Kimmell Applicator
FR2813540B1 (fr) * 2000-09-01 2003-09-26 Rene Proharam Dispositif de pulverisation, notamment a usage agricole
US7093606B2 (en) * 2003-07-08 2006-08-22 Roberts Kenneth J Liquid fertilizer injector system for lawn sprinkler systems and irrigation systems
US7156321B2 (en) * 2004-09-23 2007-01-02 Lechler Gmbh Active compound supply system and spraying device for spraying liquids

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181797A (en) 1963-04-03 1965-05-04 Hayes Spray Gun Company Mixing apparatus having plural eductors
FR2545685A1 (fr) 1983-05-13 1984-11-16 Rhone Poulenc Agrochimie Dispositif d'incorporation de produits dans un systeme d'irrigation
US5000844A (en) * 1988-10-20 1991-03-19 Philippe Cloup Device for injecting additive products into a liquid
FR2688709A1 (fr) * 1992-03-23 1993-09-24 Schlumberger Cie Dowell Melangeur d'additifs liquides en continu dans un fluide.
US20050124734A1 (en) * 2003-12-06 2005-06-09 Bayer Materialscience Ag Process for the introduction of additives, into polymer melts
US20050173326A1 (en) 2004-02-09 2005-08-11 Eco Oxygen Technologies, Llc Superoxygenation of raw wastewater for odor/corrosion control

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11096385B2 (en) * 2011-12-14 2021-08-24 Basf Se System and method for applying liquid mixtures
CN104541731A (zh) * 2015-02-12 2015-04-29 张江龙 水肥一体机
CN106807579A (zh) * 2017-02-22 2017-06-09 南通市广益机电有限责任公司 用于喷雾机药剂存储箱的搅拌装置
CN109430217A (zh) * 2018-12-12 2019-03-08 济南大学 一种喷雾机拌药与供药***及方法
CN109430217B (zh) * 2018-12-12 2024-05-14 山东博胜动力科技股份有限公司 一种喷雾机拌药与供药***及方法

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