Fluid sprinkling – spraying – and diffusing – With selective proportioning or correlated flow for plural...
Patent
1992-11-25
1994-07-05
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With selective proportioning or correlated flow for plural...
239300, 2395811, 239586, 251 6, 251 9, F16K 707, B05B 130
Patent
active
053260333
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is related to an adjustable control valve flow regulation of gas or liquid, in particular for use in controlling the quantity of paint and air supplied during a spray painting operation.
Control of paint quantity and air supply for atomizing and jet formation with manual as well as robot controlled spray painting has up to now usually been performed by means of air pressure regulated mechanical controllers. Regarding the paint quantity control, these controllers have the disadvantage that they are substantially temperature and viscosity dependent and thus require cost and energy demanding regulation of the prevailing conditions in the spray boxes and paint flow circulation.
Another disadvantage of the known technical equipment is the difficulty associated with the cleaning thereof when the color of the paint is to be changed.
SUMMARY OF THE INVENTION
Consequently, it is an object of the present invention to provide an adjustable control valve in which the disadvantages indicated above are essentially overcome.
Thus, the invention concerns an adjustable control valve for flow regulation of gas or liquid by compressing a hose at a site between two clamping members of a hose clamp device, thereby adjusting selectively the flow cross-section of the hose, one of the clamping members being operatively disposed in engagement with a movable cam disk, e.g. a rotatable eccentric sheave, operated by a shifting mechanism and mounted for actuating the clamp device to exert varying compression of the hose in accordance with the setting of the cam disk or eccentric sheave. On this background of prior art known in principle from GB-A-2.187.535 for a different field of application, the unique feature of the control valve according to the invention is then that said clamping member in engagement with the cam disk or eccentric sheave is disposed on a pivot arm which is pivotably hinged on a pivot pin substantially spaced from the compression site.
When used for the supply of paint for spray painting, this technical solution has the advantage that no mechanical valve parts are in contact with the flow of liquid, and cleaning in connection with changing of the paint is simplified and devoid of problems. It should also be clearly evident that this solution would have corresponding advantages in many other cases.
The engagement of the clamping member with the eccentric sheave is preferably effected through a ball or roll bearing, and the shifting mechanism is preferably a step motor having the eccentric sheave mounted on the motor shaft, and may advantageously be arranged to be controlled by a flow measuring device provided for gauging the flow in the hose downstream of the compression site.
The cam disk or eccentric sheave has preferably a cam profile shaped to provide a linear relation between the shift position or rotational angle of the cam and the flow cross-section of the hose at the compression site, but alternatively a data processing unit may be inserted in the controlling connection between the flow measuring device and the shifting mechanism and programmed to provide a linear relation between the shift position or rotational angle of the cam and the flow cross-section of the hose at the compression site.
The invention is also related to use of one or more adjustable control valves as indicated above, for the control of the supply of paint and/or air to an atomizing gun for spray painting, preferably for the purpose of controlling the quantity ratios between the supplies of paint, jet formation air and atomizing air, respectively, to the gun.
In practice such a quality ratio control is preferably performed by means of a common data processing unit connected between the control valve and the measuring device in all control loops for the supplies of paint, jet formation air and atomizing air, respectively, to the atomizing gun.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is now to be explained in more detail by means of exemplified embodiments with reference to
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Grant William
Kashnikow Andres
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