EP0556121B1 - Buse de pulvérisation de liquide - Google Patents

Buse de pulvérisation de liquide Download PDF

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Publication number
EP0556121B1
EP0556121B1 EP93400344A EP93400344A EP0556121B1 EP 0556121 B1 EP0556121 B1 EP 0556121B1 EP 93400344 A EP93400344 A EP 93400344A EP 93400344 A EP93400344 A EP 93400344A EP 0556121 B1 EP0556121 B1 EP 0556121B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
restraining component
section
orifice
endpiece
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.)
Expired - Lifetime
Application number
EP93400344A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0556121A1 (fr
Inventor
Patrick Jean-Marie Ballu
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.)
Tecnoma SA
Original Assignee
Tecnoma SA
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 Tecnoma SA filed Critical Tecnoma SA
Publication of EP0556121A1 publication Critical patent/EP0556121A1/fr
Application granted granted Critical
Publication of EP0556121B1 publication Critical patent/EP0556121B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/32—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
    • 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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/12—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means capable of producing different kinds of discharge, e.g. either jet or spray
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/10—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to temperature or viscosity of liquid or other fluent material discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/12—Flexible outlets

Definitions

  • the present invention relates to a liquid spray nozzle.
  • a liquid spray nozzle is, in general, a part comprising an internal vacuum, called a turbulence chamber, connected on one side to a power source, and the wall opposite to the inlet is generally of hemispherical shape.
  • a turbulence chamber connected on one side to a power source, and the wall opposite to the inlet is generally of hemispherical shape.
  • an outlet orifice In the generally hemispherical end wall of the turbulence chamber, there opens an outlet orifice, which, at the point where it opens into the turbulence chamber, has a much smaller section, not more than half and preferably less than a fifth of the cross section of the turbulence chamber.
  • the outlet opening widens outward away from the turbulence chamber, but this is not mandatory.
  • the outlet orifice can be of circular section, or of flattened section, depending on the shape of the jet of droplets which it is desired to obtain.
  • the projection nozzles which are intended to give a higher speed to a jet of liquid, without however causing it to burst into droplets, have a markedly different shape, with a gradual narrowing, possibly followed by an equally gradual widening.
  • the progressiveness of the section variations results in an increase in the speed of the jet without dispersing it.
  • the size of the droplets formed at the outlet of a spray nozzle of given dimensions and shape depends, among other things, on the pressure of the liquid in the turbulence chamber.
  • a nozzle has been proposed the end of which is made up of a block of elastic material, inside which the turbulence chamber and the outlet orifice are hollowed out.
  • the object of this provision is not to modify at will the shape of the nozzle, but to allow, by deformation of the orifice, the escape of a foreign solid which would block the nozzle, the latter then resuming its usual form.
  • the object of the invention is to provide a liquid spray nozzle, the performance of which can be varied at will, within certain limits, that is to say the size of the droplets for a given flow rate, or vice versa. flow without changing the size of the droplets.
  • the invention provides a liquid spray nozzle, comprising a body having an internal cavity and carrying a nozzle composed of a solid part made of elastically deformable material, this part having a turbulence chamber connected to the internal cavity. of the body, and an axial outlet orifice, opening into the turbulence chamber through an opening of section at most equal to half that of the turbulence chamber and with an abrupt variation in the section of passage of the liquid, characterized in that that a movable constraint piece is provided, the displacement of which acts to deform the end piece, and means for preventing the displacement of the constraint piece from substantially deforming the turbulence chamber.
  • the constraint part moves substantially transversely by acting on the part of the endpiece which contains the outlet orifice.
  • This embodiment has the advantage of its simplicity, when applied to a spray nozzle whose outlet orifice has a flattened section: it nevertheless has, even in this case, the disadvantage of modifying the shape of the outlet.
  • the constraint part is frustoconical and moves axially by acting on the outlet end of the end piece, and the latter has a peripheral groove in the vicinity of the level of the connecting passage the turbulence chamber at the outlet orifice, this groove being of calculated shape and dimension so that the deformation imposed by the constraint part is not transmitted substantially to the turbulence chamber.
  • a deformable nozzle brings adjustment possibilities which had not been exploited until now, and makes it possible to achieve the desired goal, for example by increasing the section of the orifice when the flow rate must be increased, or by decreasing it when it must be reduced, the pressure upstream of the nozzle remaining substantially constant, or alternatively by varying the supply pressure and the section of the orifice in order to vary the size of the droplets to constant flow, or by varying the flow, the pressure and the section of the orifice according to another pre-established law, according to the desired result.
  • the constraint part is a hollow part, having an interior surface converging towards the outside, which can move axially to exert on the end piece a radial compressive force tending to reduce the section of the orifice, a displacement of the stress piece in the opposite direction, releasing the compressive force, which tends to widen the orifice to the dimension it has at rest.
  • the constraint part engages the end piece and is capable of exerting on the end piece, when it moves, a radial tensile force tending to increase the section of the orifice.
  • the internal surface of the constraint part has a shape of revolution. It can also have an oval section, so as to modify the shape of the orifice, and therefore of the jet of droplets which it produces. If the orifice is in the form of a slot, the part of the internal surface of the constraint part which cooperates with the end piece is flattened in cross section.
  • the constraint part can slide axially along the body while being immobilized in rotation, and a micrometric screw device ensures its sliding movement.
  • a pressure sensor disposed in the supply circuit of the device is connected to a control member able to control the movements of the stress piece in response to signals from the pressure sensor.
  • the nozzle comprises a body 1 which has an axial passage 2 for the liquid. At one of its ends, means are provided for connection with an intake manifold.
  • the axial passage 2 ends, at the opposite end, in a turbulence chamber 3, of hemispherical shape, provided in an end piece 4 secured to the body 1, and made of a different material, which allows a deformation of this end piece at the level of the output section.
  • the end piece 4 can also be in one piece with the body 1, the deformability then results only from the shape and the thickness of the end piece.
  • the end piece has at its end an orifice 5 in the form of a slot, and more specifically a dihedral opening towards the outside, the orifice 5 opens, at its end opposite to the outside, into the turbulence chamber 3.
  • the elastomer from which the end piece 4 is made gives it flexibility in terms of deformation, making it possible to obtain a variation in the cross-section of the liquid passage, and ensures that it returns to its initial shape (position in which the end piece 4 practically does not undergo any deformation).
  • a constraint part 6 is driven in a translational movement relative to the body 1 and the end piece 4 without rotation possible thanks to two bosses and grooves 1A. This keeps the slot 5 and a slot 7 of the constraint part 6 aligned, and consequently the possible passage of the jet when the nozzle is under pressure.
  • a peripheral groove 8 is hollowed out in the outer surface of the endpiece 4 in the vicinity of a plane perpendicular to the axis which passes through the zone where the orifice 5 opens into the turbulence chamber.
  • the shape and position of the groove 8 are such that the deformation of the end piece 4 resulting from a displacement of the stress piece occurs essentially in the part of the end piece which is located between the groove 8 and the end of the end piece, and that the turbulence chamber does not is not distorted.
  • the shape of the constraint part 6 can vary depending, in particular, on the shape of the end piece 4 and its orifice 5.
  • the part of the part 6 which slides on the body 1 has a shape adapted to it, and therefore cylindrical in general.
  • the part which cooperates with the end piece may have an inner surface with a more or less flattened elliptical section, or else a circular section.
  • the nozzle 4, in each case, will have a shape adapted to preserve substantially the flattened shape of the jet of droplets which results from the elongated shape of the orifice 5.
  • the constraint part will advantageously have a form of revolution.
  • this nut is driven by a movement of rotation and translation, provided by a micrometric thread 1B between the nut and the body 1.
  • This nut is integral with a pinion 11 by means of a screw 12.
  • the pinion 11 has the function of ensuring the rotation of the nut and of carrying out the adjustment making it possible to adjust the pressure.
  • the rotation of the pinion 11 is, for its part, ensured by another pinion 13 driven by a motor 14.
  • the motor 14 is advantageously, but not necessarily, a stepping electric motor, in the in the case of automated or remote control. In a simpler embodiment, it can be replaced by a manual control, with means for locating the angular position of the pinion 11.
  • FIG. 2 schematically shows an installation equipped with nozzles according to the invention and intended to supply droplets of constant size from a positive displacement pump whose flow rate can vary.
  • a positive displacement pump whose flow rate can vary.
  • the flow rate of the pump varying with the speed of the vehicle for spray a constant amount of product per unit area.
  • the diagram in FIG. 2 can be suitable for installations in many other technical fields, with adaptations which are within the reach of those skilled in the art.
  • a boom 20 carries a series of nozzles 21 in accordance with the invention, each equipped with a motor 14.
  • the supply circuit of the boom 20 comprises a reservoir of product to be sprayed 22, a pump 23, the useful flow of which is regulated by a control system 24 itself controlled by the movement of the carrier vehicle.
  • a pipe 25 connects the spray pump 23 to the boom 20.
  • the reference 26 can designate, instead of a pressure sensor, a flow sensor, or even an assembly formed by a pressure sensor and a flow sensor.
  • the sensor 26 is connected to a control unit 27 in which the measured value is recorded, which is that of the pressure in the example described here.
  • the face of the housing is equipped with a button 28 with which the desired working value is displayed. If the measured value is greater than the desired working value, the difference between these two values is compensated by electronics which, by means of pulses, act on the motor 14, which is a stepping motor.
  • the motor turning in steps, therefore acts on the conical tip with great precision, and thus allows the tip 4 to open, thereby obtaining an adjustment of the measured value relative to the desired value.
  • the difference will be compensated so as to act on the constraint part 6, which will close the end piece 4 a little more, hence a value automatically set to the value desired.
  • the description of the above operation remains valid provided that the pressure is replaced therein by the flow or by a function chosen at pressure-flow couple advance.
  • the installation can also be represented by the diagram in FIG. 2, provided that the reference 23 designates a pumping system with stabilized outlet pressure, and the reference 26 a flow sensor.
  • Figure 3 shows another installation diagram, intended to supply a machine with a product whose the humidity must be continuously adjusted to a certain value.
  • the product to be treated 30 is poured from a hopper 31 onto a conveyor belt 32.
  • An equalizing device 33 brings the layer of product on the belt 32 to a constant thickness.
  • a gamma ray probe 34 determines the humidity level of the incoming product.
  • a temperature probe 35 likewise determines the temperature of the product.
  • the signals from the probes 34 and 35 are sent to a computer 36.
  • An adjustable nozzle 37 is connected to a water tank 38 by a pump 39.
  • the computer 36 permanently controls the pump 39 and the nozzle 37 for continuously adjusting both the water flow and the droplet size as a function of the humidity and the temperature of the product, the droplets being larger if the product is hotter.
  • the probes 34 and 35 can also be placed after the nozzle, in the direction of movement of the product.
  • the opening and the closing of the orifice is made only by elasticity, a displacement of the movable part 6 until bringing it out of contact with the end piece 4 results in l maximum opening of the slot. It is however possible to provide that the moving part can widen, still in an elastic manner, the dimensions of the orifice.
  • the end piece 40 made of elastic material, has longitudinal grooves 41 with dovetail section, which converge towards the axis.
  • a rigid constraint piece 42 which can slide axially around the end piece 41 has longitudinal dovetail ribs 43, projecting radially towards the axis, and which penetrate into the grooves 41. It can be seen that a displacement longitudinal of the part 42 increases the section of the orifice 44 of the endpiece relative to the section which it has at rest.
  • Figure 6 similar to Figure 4, corresponds to an arrangement where the orifice 44 of the nozzle is in the form of a slot instead of being of circular section.
  • the ribs 43 tend, by deviating, to widen the slot in it giving the form shown in phantom.
  • grooves 41 could also be placed in the direction of the elongation of the slot 44. In this case, the spacing of the ribs tends to close the slot.
  • FIGS. 4 to 6 make the material of the end piece 40 work by deformation on either side of a rest position, hence a lower fatigue than in the case of FIG. 1.
  • machining is more expensive. The choice between solutions is therefore essentially a question of price.

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  • Nozzles (AREA)
EP93400344A 1992-02-14 1993-02-11 Buse de pulvérisation de liquide Expired - Lifetime EP0556121B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9201685 1992-02-14
FR9201685A FR2687333A1 (fr) 1992-02-14 1992-02-14 Buse de pulverisation de liquide.

Publications (2)

Publication Number Publication Date
EP0556121A1 EP0556121A1 (fr) 1993-08-18
EP0556121B1 true EP0556121B1 (fr) 1997-03-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93400344A Expired - Lifetime EP0556121B1 (fr) 1992-02-14 1993-02-11 Buse de pulvérisation de liquide

Country Status (5)

Country Link
US (1) US5323963A (enrdf_load_stackoverflow)
EP (1) EP0556121B1 (enrdf_load_stackoverflow)
AU (1) AU654760B2 (enrdf_load_stackoverflow)
DE (1) DE69309131T2 (enrdf_load_stackoverflow)
FR (1) FR2687333A1 (enrdf_load_stackoverflow)

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FR2618087B1 (fr) * 1987-07-15 1990-02-23 Graco France Sa Procede de selection d'un fluide avec commande et regulation de son debit et dispositif mettant en oeuvre le procede et installation d'application de peinture avec selection de couleur mettant en oeuvre le procede
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US4987854A (en) * 1988-12-12 1991-01-29 Nordson Corporation Apparatus for gas-aided dispensing of liquid materials
US4930441A (en) * 1988-12-28 1990-06-05 Pitney Bowes Inc. Verification of operability of moistener

Also Published As

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AU3293393A (en) 1993-08-19
DE69309131T2 (de) 1997-07-10
EP0556121A1 (fr) 1993-08-18
US5323963A (en) 1994-06-28
FR2687333B1 (enrdf_load_stackoverflow) 1995-06-02
AU654760B2 (en) 1994-11-17
FR2687333A1 (fr) 1993-08-20
DE69309131D1 (de) 1997-04-30

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