ATOMIZING HEAD FOR SPRAYING LIQUIDS

Abstract: The invention concerns an atomizer for liquids, like water, to be atomized to humidify the atmosphere of spaces. The atomizer is of the type where liquid under pressure is atomized by compressed gas. The atomizer is equipped with a cleaning system which cleans the air nozzle (5) with the mouthpiece (13) of the liquid nozzle (12) and the liquid nozzle (12) with cleaning needle (16) which slides through liquid nozzle (12). Cleaning needle (16) is driven by piston (20) and the air nozzle (5) with airspray head (4) by compressed gas and are reset by springs (6 and 21). The quantity of atomized fluid is adjusted by a screwpart (19) whereby opening (14) is more or less opened when the atomizer is in operation.

Description: Atomizing head for spraying liquids. . \ The invention concerns an atomizer for liquids, like water, to be atomized for moistening the atmosphere in spaces, like stores for paper 05 and the like. The atomizer is of the type where the liquid is atomized with the help of compressed gas. It is possible with atomizers of the mentioned type to atomize water into such a fine mist that the formed droplets evaporate before the mist reaches equipment or stored material. In this way it is impossible that 10 droplets of water are formed other than by condensation which could cause damage. Because of the fact that in most cases tapwater is used for moistening the atmosphere one of the most important problems is the build-up of scale in the atomizer. This scale can influence the operation in a 15 negative way. As in most cases the atomizers are mounted near the ceiling maintenance is costly, There have been atomizers developed which pierces the spray nozzles and remove the scale when the atomizers are turned down. In this equipment the needle is operated with a combination αf a spring and a membrane which is activated by the pressure of the 20 watersupply. This type of atomiser is vulnerable because the operation is dependable αf a membrane. Furthermore it occurs that with a failure in the pressure of the gassupply the atomizer produces a jet of water. The invention has in view a considerable improvement of the operation of these atomizers in such a way that not only the fluid nozzle but also 25 the gas nozzle is cleaned at the moment the atomizer is shut off. This means that there is a cleaning system provided for the liquid nozzle as well for the gaε nozzle while the atomizing will only functior. when there is sufficient pressure of the gaε. Failures ir. pressure cf the gas will result in ar. immediate closing of the 30 watersupply. The atomizer constructior. has ir. normal apera ion -. con inuous waterpressurs while the nozzles are cleaned by periodical shut-off cf the gas sui-r " without the risk that the atomizer produceΞ _. squirt of r_o -atomized liquid ir. the atmosphere. 35 The nventior. will be enplaned with the help of the drawing. ?i ~ . - shows a crαssser icr. alone the length cf the atomizer at rest. Fig. _. shows the seal of the liquid supply when gas-pressure is absent. Fig. 1 shows with (1) the housing of the aton izer. In the housing <! ' < is C2> the liquid supply and with (3) the supply for compressed gas ( further-on to be indicated with air). In the front is airspray head (4) with air nozzle (5). The airspray head (4) is axial forced with airspray head spring (6) and held by ring (7) which is attached tc housing (1). Ring (7> is provided with a. groove that carries sealing ring (δ). Flange (9) of airspray head (4> realises with sealing ring <& '~ - a gastight seal between flange (9) and housing CD. Between flange (9) and housing (1) is ample tolerance to permit cleaning by air when the atomizer is put into operation. In the centre of the housing is a plug (10) screwed-in which carries nozzle holder (11). In this nozzle holder (11) is a nozzle (12; attached. The mouthpiece (13) reaches through air nozzle (5) cf airspray head (4) when airspray head (4) is pushed back by spring (6/. From the wall of nozzle (12) a part is taken away to form opening (14 ) . In the end (15) of nozzle (12) is cleaning needle (16 located. Cleaning needle (16) has a sliding fitting inside nozzle (12) and can move axial to position (17). Cleaning needle (16) is connected with piston rod (1&) which is adjustable connected with screwpiece (19) to the piston (20). Piston (20) is pushed axial by piston spring (21) in the direction of nozzle (12). Piston spring (21) rests against spring holder (22) which is attached in cylinder (23). Spring holder (22) carries in a groove sealing ring (24) which provides a gastight seal between piston (20) and cylinder (23). Piston (20) fits with ample tolerance in cylinder (23"' which allows piston spring (21) in all cases to bring piston (20) in the rest position. In housing (1> is provided for a seal (25) through which pistonrc-d "LI car. travel axially in housing (1>. Housing (1) is provided with ar. air supply connection <25" that connects gas supply '1" < with space "l . Also ir_ housing -D is a connection <2S N which connects space (27: with cylinder space (29V C~ the side of space (2?" there is a sealing rir_~ 3C mounted in a recess inside connection 2»:" that seals cn-ez.icr. (23> with flange (9). Licuid supply (2 is connected with space (3D with connection (-32 ' Spa e (31" can be separated fron space '34' bv seal '33'- again", the screw part of tube-like piece (10). The operation is as follows: Liquid under pressure is supplied through liquid supply (2) to space (31). Seal (33) is closed by the force of piston spring (21). Air under pressure is supplied at (3). Via connection (26) space (27) will be pressurised. Airspray head (4) moves axial against the force αf spring (6) until the dotted position. Flange (9> will seal against sealing ring (8), As soon as airspray head (4) is released from seal (30) compressed air will flow through connection (28) to cylinder space (29) and move piston (20) axially until the dotted position. Piston (20) will then seal against sealing ring (24). Together with piston (20) pistonrαd (18) will retrieve cleaning needle (16) and clear opening (14). Together with piston rod (18) seal (33) is released and the liquid can reach opening (14) via space (34). Liquid will flow out of the mouthpiece (13) and will be atomized by the airstream in air nozzle (5). When the air supply is cut-off the force of piston spring (21) and spring (6) will close seal (33) and nozzle (12) will be pierced by cleaning needle (16) and air nozzle (5) will be pierced by nozzle (12). With screw part (19) of piston rod (18) cleaning needle (16) can be adjusted and herewith the passage αf opening (14) in nozzle (12). This is a provision for a fine adjustment of the quantity αf the atomized fluid.

Claims: Claims. 11 Atomizer for atomizing liquids with the help cf gas under pressure characterised in that the atomizer is provided of a cleaning system 05 consisting of a nozzle (12) which, fitting in, reaches through the air nozzle (5> in airspray head (4) and in which a axial movable cleaning needle (16) is located which is brought in operational position by a piston (20> by compressed gas against the resilience of the piston spring (21) and release opening (14) for the liquid and where the 10 airspray head (4> moves axially by the compressed gas against tne resilience of the airspray head spring (6) and releases air nozzle (5). 23 Atomizer for atomizing liquids with the help of gas under pressure as in claim 1 characterised in that the cleaning needle (16) remains inside 15 the nozzle (12) while moving to the operational position and the liquid flows into nozzle (12) through an opening (14) whic is created by- taking away a part of the wall of the tube and where the detached part shows a inclination and where the cleaning needle (16) in operational position releases the opening (14) partly. 20 31 Atomizer for atomizing liquids with the help of gas under pressure as in claim 1 and 2 characterised in that the connection between piston (20) and piston rod (18) is axial adjustable by screw piece (19). 2541 Atomizer for atomizing liquids with the help αf gas under pressure as in claim 1, 2 and 3 characterised in that the piston rod (18> carries a sealing element (33) which in rest position is forced against the sealing surface of plug (IC- by resilience cf the piston spring (21). 3051 Atomiser for atomizing liquids with the help of gas under pressure as in claim 1, 2, 3 and 4 characterised ir. that connection (28) for compressed gas to cylinder space (29) is :.losed by the airspray hea»d f4 ' when the supply cf compressed gas is cut-off. 3561 Atomizer for atomizing liquids with the help cf gas under pressure as in claim 1, 2, 3, 4 and 5 characterised in that the piston (20) an»d flange (9 have a diametral tolerance between C.i and 1 millimeter and ir. h.ous_

Inventors: VALSTER JOHANNES, VALSTER, JOHANNES
Applicants: VALSTER JOHANNES, VALSTER, JOHANNES
Application year: 1992
Main classification: B05B7
IPC codes: B05B7, B05B15