EP0674946B1 - Spray nozzle for liquid - Google Patents
Spray nozzle for liquid Download PDFInfo
- Publication number
- EP0674946B1 EP0674946B1 EP95490012A EP95490012A EP0674946B1 EP 0674946 B1 EP0674946 B1 EP 0674946B1 EP 95490012 A EP95490012 A EP 95490012A EP 95490012 A EP95490012 A EP 95490012A EP 0674946 B1 EP0674946 B1 EP 0674946B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- channel
- tip
- intersections
- upstream
- 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
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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
- B05B1/04—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
Definitions
- the invention relates to a spray nozzle of a liquid substance.
- the object of the invention relates more particularly to the nozzles providing a flat jet output.
- this nozzle finds application in the ground marking of strips of signage.
- Said nozzle which then forms part of an installation carried by a machine which moves parallel to the belt, is arranged so that the projection surface of the liquid has its length which corresponds to the width of the bandaged.
- the head is generally hemispherical (FR-A-2546080, FR-A-2637819), but also it can be on the surface frustoconical (FR-A-2303603, FR-A-2361944).
- the internal wall of this fraction downstream is like a hemispherical wall.
- the nozzle is formed by a transverse groove which, in the case of flat jet nozzles, gives the nozzle in axial view roughly the shape of a cat's eye.
- the quality of the projection depends on many parameters that must be integrated to obtain a nozzle efficient.
- a nozzle is known (US-A-2,985,386) whose generator of the inner wall of the so-called downstream fraction which extends the upstream fraction of said channel is determined to define a warp-shaped room.
- the nozzle is formed by a groove cross section of Vee delimited by two notches in Vee communicating with each other and each extending over the half the width of the nozzle and whose intersections plans delimiting said Vee notches are symmetrically to the axis slightly inclined with respect to one to the other.
- the invention relates to a nozzle spraying of the aforementioned type, in particular characterized in that the intersections converge towards the distal end of the nozzle.
- the material 1 sprays a liquid substance 2 on a receiving surface 3.
- This spraying equipment includes a reserve 4 of liquid substance to be projected and projection means 5.
- projection means 5 comprise at least one nozzle 6 spraying circuit 7 for supplying liquid to the aforementioned nozzles and at least one pump 8 for supplying the fluid from reserve 4 to nozzles 6.
- the nozzle 12 is formed by a transverse groove 13 which has a shape defined according to the type of jet to be generated.
- this groove gives the nozzle, in axial view, a cat eye shape.
- the axial 1O channel is a cavity cylindrical of revolution with a section which, from its upstream end, is constant over a fraction 14 of its length, called upstream fraction 14, then gradually decreases according to a predetermined profile to connect to the nozzle.
- the generator 15 of the internal wall of fraction 16 said downstream which extends the upstream fraction 14 of said channel is determined to define a chamber 17 in the form of a warhead.
- the radius of the warhead of this wall and the section of the channel in its upstream part are determined for balance the forces due to the shear rate of the substance to be sprayed.
- the outer wall of the nozzle head also has a warhead shape and the groove 13 delimiting the nozzle has a section in Vé.
- the branches of the Vé delimit between them an angle of around 45 °.
- the pointed shape of the inner wall and the wall external is very interesting because it multiplies the nozzle adjustment possibilities.
- said nozzle is delimited by two notches 13A, 13B in Vee communicating with each other and each extending over half the width of the nozzle and whose intersections 18 of the plans delimiting the said V-shaped notches are symmetrically to the axis slightly inclined with respect to one to the other, according to the invention, the intersections 18 of these planes converge towards the distal end of the nozzle.
- This particular orientation significantly improves the projection quality.
Abstract
Description
L'invention se rapporte à une buse de pulvérisation d'une substance liquide.The invention relates to a spray nozzle of a liquid substance.
Il existe principalement deux types de buses qui se distinguent par la forme du jet du liquide qu'elles projettent.There are mainly two types of nozzles which distinguish by the shape of the jet of liquid they plan.
Ces deux types sont les buses à jet conique à surface de projection circulaire et celle à jet plat, en forme d'éventail, à surface de projection sensiblement rectangulaire de grande longueur, mais de faible largeur.These two types are the conical jet nozzles with a surface of circular and flat spray projections, shaped fan, with substantially rectangular projection surface very long, but narrow.
L'objet de l'invention se rapporte plus particulièrement aux buses fournissant en sortie un jet plat.The object of the invention relates more particularly to the nozzles providing a flat jet output.
Plus particulièrement, mais non exclusivement, cette buse trouve application dans le marquage au sol de bandes de signalisation.More particularly, but not exclusively, this nozzle finds application in the ground marking of strips of signage.
Ladite buse, qui fait alors partie d'une installation portée par un engin qui se déplace paralèlement à la bande, est disposée de manière que la surface de projection du liquide ait sa longueur qui corresponde à la largeur de la bande.Said nozzle, which then forms part of an installation carried by a machine which moves parallel to the belt, is arranged so that the projection surface of the liquid has its length which corresponds to the width of the bandaged.
Classiquement, une telle buse comprend une enveloppe qui loge un canal axial, lequel :
- d'une part, à son extrémité aval, débouche sur l'extérieur, en tête de l'enveloppe, au travers d'un ajutage et,
- d'autre part, à son extrémité amont, est, par la base de l'enveloppe, relié hydrauliquement à un circuit d'alimentation.
- on the one hand, at its downstream end, opens onto the outside, at the head of the envelope, through a nozzle and,
- on the other hand, at its upstream end, is, by the base of the envelope, hydraulically connected to a supply circuit.
La tête est généralement hémisphérique (FR-A-2546080, FR-A-2637819), mais également elle peut être à surface tronconique (FR-A-2303603, FR-A-2361944).The head is generally hemispherical (FR-A-2546080, FR-A-2637819), but also it can be on the surface frustoconical (FR-A-2303603, FR-A-2361944).
De manière classique, le canal axial est une cavité cylindrique avec une section qui :
- d'une part, en amont, est constante sur une fraction de sa longueur et,
- d'autre part, diminue progressivement vers l'aval selon un profil prédéterminé pour se raccorder à l'ajutage.
- on the one hand, upstream, is constant over a fraction of its length and,
- on the other hand, gradually decreases downstream according to a predetermined profile to connect to the nozzle.
Dans les buses connues, la paroi interne de cette fraction aval s'apparente à une paroi hémisphérique.In known nozzles, the internal wall of this fraction downstream is like a hemispherical wall.
L'ajutage est formé par une saignée transversale qui, dans le cas des buses à jets plats, donne à la buse en vue axiale sensiblement la forme d'un oeil de chat.The nozzle is formed by a transverse groove which, in the case of flat jet nozzles, gives the nozzle in axial view roughly the shape of a cat's eye.
Notamment, pour dans cette application avoir une bande d'épaisseur constante sur toute sa largeur avec ces buses dites à jet plat, on souhaite que la quantité de substance liquide projetée soit la plus constante possible tout au long de l'axe longitudinal de la surface de projection.In particular, for this application to have a band constant thickness over its entire width with these nozzles say flat spray, we want the amount of substance sprayed liquid is as constant as possible throughout from the longitudinal axis of the projection surface.
Or, avec la forme en éventail du jet, la tendance est plutôt de charger fortement le centre.However, with the fan shape of the jet, the trend is rather to heavily load the center.
Avec les buses connues à ce jour, il est donc très difficile d'obtenir le résultat visé.With the nozzles known to date, it is therefore very difficult to achieve the desired result.
En outre, la qualité de la projection dépend de nombreux paramètres qu'il faut intégrer pour obtenir une buse performante.In addition, the quality of the projection depends on many parameters that must be integrated to obtain a nozzle efficient.
Ces paramètres sont, par exemple, la forme de l'ajutage, le type de fluide, sa viscosité en fonction de la température, la nature de l'écoulement, etc...These parameters are, for example, the shape of the nozzle, the type of fluid, its viscosity as a function of temperature, the nature of the flow, etc ...
Tous ces facteurs doivent être pris en compte ensemble pour la détermination de la buse car ils sont essentiels pour l'homogénéité du jet. All of these factors need to be considered together for the determination of the nozzle as they are essential for the homogeneity of the jet.
Les possibilités d'adapter les buses existantes aux diverses spécificités des liquides sont limitées et il est très difficile de parvenir à une bonne uniformité de projection.The possibilities of adapting existing nozzles to various specificities of liquids are limited and it is very difficult to achieve good uniformity of projection.
Est connue une buse (US-A-2.985.386) dont la génératrice de la paroi interne de la fraction dite aval qui prolonge la fraction amont du dit canal est déterminée pour définir une chambre en forme d'ogive.A nozzle is known (US-A-2,985,386) whose generator of the inner wall of the so-called downstream fraction which extends the upstream fraction of said channel is determined to define a warp-shaped room.
Pour cette buse, l'ajutage est formé par une saignée transversale de section en Vé délimitée par deux entailles en Vé communiquant entre elles et s'étendant chacune sur la moitié de la largeur de l'ajutage et dont les intersections des plans délimitant lesdites entailles en Vé sont symétriquement à l'axe légèrement inclinées l'une par rapport à l'autre.For this nozzle, the nozzle is formed by a groove cross section of Vee delimited by two notches in Vee communicating with each other and each extending over the half the width of the nozzle and whose intersections plans delimiting said Vee notches are symmetrically to the axis slightly inclined with respect to one to the other.
Pour cette buse, les intersections des plans convergent vers l'arrière de la buse c'est à dire à l'opposé de l'extrémité aval.For this nozzle, the intersections of the planes converge towards the rear of the nozzle, i.e. opposite to the downstream end.
Les résultats obtenus ne sont pas suffisants.The results obtained are not sufficient.
Un des résultats que l'invention vise à obtenir est une buse qui remédie à ces inconvénients.One of the results which the invention aims to obtain is a nozzle which overcomes these disadvantages.
A cet effet, l'invention a pour objet une buse de pulvérisation du type précité notamment caractérisée en ce que les intersections convergent vers l'extrémité distale de la buse.To this end, the invention relates to a nozzle spraying of the aforementioned type, in particular characterized in that the intersections converge towards the distal end of the nozzle.
L'invention sera bien comprise à l'aide de la description ci-après faite à titre d'exemple non limitatif en regard du dessin ci-annexé qui représente schématiquement :
- figure 1 : une installation de projection,
- figure 2 : une buse de projection,
- figure 3 : une vue axiale d'une buse de pulvérisation,
- figure 4 : une coupe selon IV-IV de la figure 3.
- Figure 1: a projection installation,
- FIG. 2: a projection nozzle,
- FIG. 3: an axial view of a spray nozzle,
- Figure 4: a section on IV-IV of Figure 3.
En se reportant au dessin, on voit que le matériel 1
pulvérise une substance liquide 2 sur une surface réceptrice
3.Referring to the drawing, we see that the
Ce matériel de pulvérisation comprend une réserve 4 de substance liquide à projeter et des moyens de projection 5. This spraying equipment includes a reserve 4 of liquid substance to be projected and projection means 5.
Ces moyens de projection 5 comprennent au moins une buse 6
de pulvérisation, un circuit 7 d'alimentation en liquide des
buses précitées et au moins une pompe 8 pour amener le fluide
depuis la réserve 4 jusqu'aux buses 6.These projection means 5 comprise at least one
De manière classique chaque buse 6 comprend une enveloppe 9 qui loge un canal axial 10, lequel :
- d'une part, débouche à son
extrémité aval 11 sur l'extérieur, en tête de l'enveloppe 9, au travers d'un ajutage 12 et, - d'autre part, est relié hydrauliquement à son extrémité
amont par sa base à un
circuit 7 d'alimentation.
- on the one hand, opens at its
downstream end 11 on the outside, at the head of thecasing 9, through anozzle 12 and, - on the other hand, is hydraulically connected at its upstream end by its base to a
supply circuit 7.
L'ajutage 12 est formé par une saignée transversale 13 qui
est de forme définie en fonction du type de jet à engendrer.The
Dans le cas des jets plats, cette saignée donne à la buse, en vue axiale, une forme en oeil de chat.In the case of flat jets, this groove gives the nozzle, in axial view, a cat eye shape.
De manière classique, le canal 1O axial est une cavité
cylindrique de révolution avec une section qui, à partir de
son extrémité amont, est constante sur une fraction 14 de sa
longueur, dite fraction amont 14, puis diminue progressivement
selon un profil prédéterminé pour se raccorder à l'ajutage.Conventionally, the axial 1O channel is a cavity
cylindrical of revolution with a section which, from
its upstream end, is constant over a
La génératrice 15 de la paroi interne de la fraction 16
dite aval qui prolonge la fraction amont 14 dudit canal est
déterminée pour définir une chambre 17 en forme d'ogive.The
De manière remarquable, le rayon d'ogive de cette paroi et la section du canal dans sa partie amont sont déterminés pour équilibrer les forces dues au taux de cisaillement de la substance à projeter.Remarkably, the radius of the warhead of this wall and the section of the channel in its upstream part are determined for balance the forces due to the shear rate of the substance to be sprayed.
La paroi externe de la tête de la buse a également une
forme d'ogive et la saignée 13 délimitant l'ajutage a une
section en Vé.The outer wall of the nozzle head also has a
warhead shape and the
Les branches du Vé délimitent entre elles un angle de l'ordre de 45°.The branches of the Vé delimit between them an angle of around 45 °.
La forme en ogive de la paroi interne et de la paroi externe est très intéressante car elle multiplie les possibilités de réglage des buses.The pointed shape of the inner wall and the wall external is very interesting because it multiplies the nozzle adjustment possibilities.
Ces possibilités de réglage viennent s'ajouter à celles découlant de la forme de l'ajutage. These adjustment possibilities are added to those arising from the shape of the nozzle.
Au lieu que l'ajutage soit délimité par une seule entaille
13 en Vé, ledit ajutage est délimité par deux entailles 13A,
13B en Vé communiquant entre elles et s'étendant chacune sur
la moitié de la largeur de l'ajutage et dont les intersections
18 des plans délimitant lesdites entailles en Vé sont
symétriquement à l'axe légèrement inclinées l'une par rapport
à l'autre, selon l'invention, les intersections 18 de ces
plans convergent vers l'extrémité distale de la buse.Instead of the nozzle being delimited by a
L'inclinaison de ces intersections par rapport à un plan radial est de l'ordre de 15°.The inclination of these intersections with respect to a plane radial is around 15 °.
Cette orientation particulière améliore sensiblement la qualité de projection.This particular orientation significantly improves the projection quality.
Par ailleurs, lorsque celle-ci se combine avec la forme en ogive de la paroi externe, on obtient des résultats tout à fait excellents.Furthermore, when this combines with the form in warhead of the outer wall, results are obtained at made excellent.
Claims (4)
- A spray nozzle for a liquid substance comprising a shell (9), which houses an axial channel (10), with said channel :opening to the outside at its downstream end (11), at the head of the shell (9), through a tip (12), on one side, andbeing hydraulically connected at its upstream end to a feed circuit by its base, on the other side,
said axial channel being a cylindrical cavity with a circular section, which is constant from the upstream end thereof along an upstream portion (14) of its length, and then decreases gradually according to predetermined profile for connection to the tip,the generatrix (15) of the inner wall of the downstream portion (16) continuing the upstream portion (14) of said channel being determined to provide an ogive-like chamber (17),the tip (12) being formed by a transverse groove (13) having a V-shaped section, with the legs of the V forming a constant predetermined angle therebetween, said groove being limited by two V-notches (13A, 13B) in communication with each other and each extending over half the tip width, with the intersections (18) of the planes delimiting said V-notches being slightly slanted with respect to each other axisymmetrically,
said nozzle being CHARACTERIZED in that the intersections (18) are converging towards the distal end of the nozzle. - The nozzle according to claim 1, characterized in that the slant of the intersections with respect to a radial plane is of the order of 15°.
- The nozzle according to claim 1 or 2, characterized in that the legs of the V form an angle of the order of 45° therebetween.
- The nozzle according to claim 1, characterized in that the outer wall of the nozzle head also has an ogive-like configuration.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9404054 | 1994-03-28 | ||
| FR9404054A FR2717712B1 (en) | 1994-03-28 | 1994-03-28 | Spray nozzle of a liquid substance. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0674946A1 EP0674946A1 (en) | 1995-10-04 |
| EP0674946B1 true EP0674946B1 (en) | 1998-07-08 |
Family
ID=9461801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95490012A Expired - Lifetime EP0674946B1 (en) | 1994-03-28 | 1995-03-15 | Spray nozzle for liquid |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0674946B1 (en) |
| AT (1) | ATE168044T1 (en) |
| DE (1) | DE69503280D1 (en) |
| FR (1) | FR2717712B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG187751A1 (en) | 2010-08-16 | 2013-03-28 | Airgard Inc | Momentum transfer using liquid injection |
| WO2016077114A1 (en) | 2014-11-10 | 2016-05-19 | Bowles Fluidics Corporation | Spray nozzle for high viscosity (e.g., oil) spray applications with uniform spray distribution |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH351910A (en) * | 1956-02-25 | 1961-01-31 | Lechler Paul Fa | fan jet nozzle |
| US2985386A (en) * | 1958-07-18 | 1961-05-23 | William F Steinen | Spray nozzle |
-
1994
- 1994-03-28 FR FR9404054A patent/FR2717712B1/en not_active Expired - Fee Related
-
1995
- 1995-03-15 AT AT95490012T patent/ATE168044T1/en not_active IP Right Cessation
- 1995-03-15 EP EP95490012A patent/EP0674946B1/en not_active Expired - Lifetime
- 1995-03-15 DE DE69503280T patent/DE69503280D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ATE168044T1 (en) | 1998-07-15 |
| FR2717712A1 (en) | 1995-09-29 |
| EP0674946A1 (en) | 1995-10-04 |
| FR2717712B1 (en) | 1996-05-15 |
| DE69503280D1 (en) | 1998-08-13 |
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