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(11) | EP 1 035 925 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
ATOMISER FOR FLUIDS FLÜSSIGKEITSZERSTÄUBER ATOMISEUR POUR FLUIDES |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The invention concerns an atomiser for fluids with the support of compressed gas. The atomiser is provided with cleaning systems for cleaning the fluid nozzle and also the gas nozzle. The cleaning action is introduced by closing the gas supply and executed by springs. The atomiser is so organised that only fluid is forwarded after opening of the gas supply.
[0003] A plunger activated by compressed gas positions the cleaning tube into working position with thrust bars after which the fluid supply is opened and then the triangular opening will be open.
[0004] The atomiser is characterised in that both the fluid nozzle and the gas nozzle are rigid fixed in the atomiser and the cleaning elements are moving.
[0005] The atomiser is very suitable for humidifying air in spaces, atomising suspensions like disinfectants and such.
[0006] Atomisers of this kind are known from the European publication EP-A-525164. It turned out that the cleaning is not optimal and the production of noise is considerable. By having a separate cleaning system for the fluid nozzle and the gas nozzle it has been possible to reduce the noise of atomising and have a more effective cleaning. Therefore a movable needle is placed in the fluid supply tube and around the fluid supply tube a cleaning element that cleans the gas nozzle. The atomiser of GB-A-492852 ( and FR-A-831076) has a fluid nozzle which functions also as cleaning element. The position of the fluid nozzle in working position is dependent of machining tolerances and dirt depositions. The operation of this type of atomiser is easily influenced by differences of the pressure of the fluid supply, which can be considerable in high spaces.
[0007] The invention will be explained with the help of the drawing.
Fig. 1 shows a cross-section along the length of the atomiser at rest
Fig. 2 shows the atomising head enlarged and operational.
Fig. 3 shows a section at the position of the gas and fluid connections.
[0008] In Fig. 1 The atomiser body is indicated with (1). Gas nozzle (2) is mounted in body (1). On the other side is bottom (3) mounted. Bottom (3) fits in the cylindrical boring (4) where piston (5) moves axially. Piston (5) is urged by spring (6) into boring (4). Needle holder (7), which is positioned in the centre of the atomiser slides through piston (5). Stop (8) is adjustable fixed to needle holder (7). Spring (9) forces needle holder (7) via stop (8). Needle holder (7) is drilled on end (10) with a stepped hole (11). Needle (12) slides fitting through fluid nozzle (13) which is fixed in holder (14). At (15) a part of the wall of fluid nozzle (13) is taken away to have a triangular opening. In holder (14) is a boring (16) which holds sealing ring (17). End (10) of needle holder (7) slides easily through boring (16). Inside gas nozzle (2) is a cleaning element (18) composed of a holder (19) and tube (20) which slides fittingly around fluid nozzle (13) and sliding fittingly inside blow opening (21) of gas nozzle (2). Holder (19) is urged against body (1) by spring (22). In boring (23) lies with play thrust bar (24). Thrust bar (24) reaches into boring (4) and has such a length that piston (5) with help of spring (6) displaces holder (19) against spring (22) so far that tube (20) reaches through blow opening (21).
[0009] Compressed gas is supplied via connection (25) and channel (26) which goes from boring (4) until space (27) in gas nozzle (2). Fluid is supplied via connection (28), boring (29) to channel (30) in which needle holder (7) is. In channel (30) is at (31) the passage of needle holder (7) sealed.
[0011] Fig. 1 shows the atomiser at rest. Fluid is supplied under pressure via connection (28). Needle holder (7) rests with end (10) against seal (17) with the force of spring (9) and seals the connection between channel (30) and triangular at (15). Needle (12) reaches whole through fluid nozzle (13).
[0012] Piston (5) pushes with the support of spring (6) and thrust bar (24) cleaning element (19, 20) through blow opening (21).
[0013] When compressed gas is admitted to connection (25) piston (5) will move with sufficient gas pressure against spring (6). This allows cleaning element (18) by spring (22) to free blow opening (21). The compressed gas can now flow through blow opening (21). When piston (5) moves further-on needle holder (7) will come into action and free seal (17). When piston (5) reaches the end of its travel triangular opening at (15) will be opened. The dimension of this opening is adjusted with stop (8). Fluid now flows from channel (30) via triangular opening at (15) through fluid nozzle (13) to blow opening (21) and is atomised in the already existing gas stream.
[0014] At closing of the gas supply the movements will be executed in reverse sequence, where it must be remarked that the fluid supply is already closed with seal (17) before the pressure has completely gone. Therefore the last fluid from fluid nozzle (13) will always be atomised. With every interruption of the atomising process there is a cleaning movement where the fluid nozzle (13) will be pierced by needle (12) and blow opening (21) by tube (20).
1. Atomiser for atomising of fluid with the support of compressed gas which is provided
with a cleaning system for a gas nozzle (2) and a fluid nozzle (13) characterised by that the atomiser (1) is provided with a fixed gas nozzle (2) and a fixed fluid nozzle
(13) where the cleaning operation of the gas nozzle (2) by a tube (20) is caused by
the force of a spring (6) against a piston (5) where the action of the piston (5)
is transferred by one or more thrust bars (24) to a holder (19) of a tube (20) and
the cleaning operation of fluid nozzle (13) is executed by a cleaning element (12)
through a needle holder (7) and a stop (8) and a spring (9).
2. Atomiser according to claim 1 characterised by than the piston (5) at starting the operation of the atomiser (1) by means of a compressed
gas moves axially where first holder (19) by the push bars (24) reaches working position
after which the stop (8) is brought into action after an adjustable free stroke of
the piston (5).
3. Atomiser according to claim 1 and 2 characterised by that the fluid supply is closed by the hollow part of the needle holder (7) and the
elastic ring (17) in the holder 14.
1. Spritzdüse zum sprühen von Flüssigkeiten unter Zuhilfenahme von zusammengepresst Gas
der ist vorhergesehen mit ein Reinigungssystem für ein Gasdüse (2) und ein Flüssigkeitsdüse
(13) gekennzeichnet durch daß der Spritzdüse (1) ist vorhergesehen mit ein ortsfester Gasdüse (2) und ein ortsfeste
Flüssigkeitsdüse (13) wobei der Reinigingsoperation von der Gasdüse (2) durch ein Rohr (20) verursacht wird durch der Kraft einer Feder (6) gegen der Kolben (5) wobei die Action von der Kolben (5)
ist übertragen mittels ein oder mehere Druckstange (24) zu ein Halter (19) von ein
Rohr (20) und der Reinigingsoperation von der Flüssigkeitsdüse (13) ist durchgeführt
mit ein Reinigungselement (12) durch Nadelhalter (7) und ein Anschlag (8) und ein Feder (9).
2. Spritzdüse nach Anspruch 1 gekennzeichnet durch daß der Kolben (5) bei Anfangen von der Wirkung der Spritzdüse (1) durch ein zusammengepresten Gas axial bewegt wobei zum ersten Halter (19) mittels die Druckstange
(24) der Arbeitsposition bereicht woraufhin der Anschlag (8) in Action gebracht wird
nach ein eistellbarer Freilauf von der Kolben (5)
3. Spritzdüse nach Anspruch 1 und 2 gekennzeichnet durch daß die Zufuhr von Flüssigkeit abgeslossen wird durch der hohler Teil von der Nadelhalter (7) und der elastische Ring (17) innerhalb der
Halter (14).
1. Pulvérisateur pour pulvériser des fluides avec l'aide de gaz comprimé quelle est prévu
avec une système de nettoyage pour un arroseur de gaz (2) et un arroseur de fluide
(13) characterisé par que le pulvérisateur (1) est prévu avec un arroseur de gax immobile (2) et un
arroseur de fluide immobile (13) ou l'opération de nettoyage du arroseur de gaz (2)
par un tuyau (20) est causé par la force d'un ressort (6) vers un piston (5) prés
de quoi le action du piston (5) est transferrée par un ou plus tiges de poussée (24)
vers un porteur (19) d'une tuyau (20) et l'operation de nettoyage de l'arroseur de
fluide (13) est executer par un élément de nettoyage (12) vers un porteur de aiguille
(7) et un arrêt (8) et un ressort (9).
2. Pulvérisateur pour pulvériser des fluides suivant la revendication 1 characterisé par que le piston (5) en commencé l'opération du pulvérisateur (1) par moyen du gaz
comprimé est mettre en mouvement axiale près de quoi en premièrement porteur (19)
par tiges de poussée (24) atteint le position de fonctionnement après ça l'arrêt (8)
est mettre en action après une ajustable parcours libre du piston (5).
3. Pulvérisateur pour pulvériser des fluides suivant la revendication 1 et 2 characterisé par que l'alimentation de fluide est arrêté par le partie creux du porteur de aiguille
(7) et l' anneau elastique (17) dans le porteur (14).