Fluid sprinkling – spraying – and diffusing – Including supplemental gas shaping or shielding jet
Patent
1990-09-12
1993-04-20
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including supplemental gas shaping or shielding jet
23953315, 239579, 137509, 251 635, 251340, B05B 128, B05B 130
Patent
active
052035085
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a dosing gun, in particular a high-pressure dosing gun for spraying a medium such as polishing paste.
In patent DE-C-22 04 942, a high-pressure dosing gun is described for the first time in which a pressure determining the motion of the valve body such as a valve piston is generated by a compressed air motor in a supply chamber containing the medium to be sprayed, such as polishing paste. To do so, the medium encloses the valve piston at least in the area of the valve seat, such that the valve piston is at a distance from or in contact with the valve seat depending on the prevailing pressure, in order to thereby spray or retain the medium as required.
When the medium is sprayed without the supply of air, this is referred to as the "airless" method. Before the medium can be sprayed, it is necessary to bleed the high-pressure dosing gun. To do so, separate valves are necessary in some cases or the air present is ejected too at the start of spraying, with the result that there is no reproducible output of the medium at this time.
German patent DE-A-32 02 189 describes a high-pressure dosing gun in which the valve body is arranged fixedly and the spring-pressure-loaded nozzle containing the valve seat can be in contact with or at a distance from the valve piston. The spring surrounds the nozzle coaxially and is fixed by a cap nut. A design of this type has proved to have major drawbacks. A further drawback of this gun design is that the sealing action is between the valve body and a section of a cylinder element containing the nozzle, said section being movable relative to the valve element, so that a relatively large sealing area is obtained from which high forces result, which in their turn must be compensated or balanced by a spring element with correspondingly high force. The result is the risk that even with minor leaks from the valve seat or from the seal itself an internal pressure can build up which is no longer sufficient to move the cylinder element. It is of major importance, particularly when using or operating with abrasive media such as polishing paste, for the valve arrangement to be sufficiently open, since otherwise a self-destructive effect as a result of uneven washing out at the valve seat or valve shank will occur in spite of the use of carbides or similar, thereby further accelerating wear. In addition, the manual opening necessary for putting into service the valve arrangement for bleeding the system is only possible with an additional special tool. The sensitivity necessary for operating an arrangement of this type with atomizer air is inadequate for achieving the consistent high level of dosability required. This is not achievable with the device shown in DE-A-32 02 189.
High-pressure dosing guns of this type have the further drawback that frequent changing is necessary of wear parts such as the valve body or valve element containing the valve seat, such as the perforated disk. In addition, design drawbacks may then be present if the valve body is designed as a hollow needle through which flows the medium to be sprayed.
The object of the present invention is, among others, to develop a dosing gun such that replaceability of the wear parts is reduced, and high reproducibility of the sprayed media is achieved by simple design means, where small sealing surfaces must be selected in particular for better control of the forces generated. In addition, simple replacement of any worn parts should be possible. Finally, it should also be possible to operate the dosing gun with the "airless" method or with a compressed air supply as required. A further object of the present invention is to achieve bleeding with simple means, with both rapid bleeding and if necessary continuous bleeding being possible. In addition, the nozzle should be adjustable with simple means without the need for cap nuts or similar that have to be tightened.
The invention is particularly noteworthy in that the valve body is mounted detachable from a first casing combining with it to form a unit, in t
REFERENCES:
patent: 3332623 (1967-07-01), Gallant
patent: 3561680 (1971-02-01), Ott
patent: 4650119 (1987-03-01), Pomponi, Jr.
patent: 4735362 (1988-04-01), Trautwein et al.
patent: 4982899 (1991-01-01), Kille et al.
Kashnikow Andres
Trainor Christopher G.
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