Ventilation – Workstation ventilator – Spray booth
Patent
1996-12-10
1998-06-09
Joyce, Harold
Ventilation
Workstation ventilator
Spray booth
B05B 1512
Patent
active
057625484
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method of ventilating a treatment cubicle, particularly a painting or spraying cubicle for painting objects such as vehicle bodies, in which method the fresh air to be supplied to the cubicle is supplied via an air-permeable ceiling, with an air supply chamber being arranged above the ceiling; this chamber communicates with an inlet air chamber connected via at least one aperture to a fresh-air supply system, and in which method the quantity of fresh air flowing into the air supply chamber can be regulated by altering the aperture.
The invention also relates to a treatment cubicle, particularly a painting and spraying cubicle for painting objects such as vehicle bodies, having an air supply chamber arranged above an air-permeable ceiling and substantially extending across the entire length of the cubicle's ceiling, and having an inlet air chamber communicating via at least one adjustable aperture with the air supply chamber and connected to a fresh-air supply system.
BACKGROUND OF THE INVENTION
A treatment cubicle of the named type is known from DE 29 32 392 C3. In this known cubicle, fresh air or treated exhaust air is passed via vertical inlet-air conduits into one or more inlet air chambers which in turn communicate, via horizontally arranged, adjustable flaps within through-apertures, with an air inlet chamber located therebelow. The air inlet chamber is arranged above an air-permeable ceiling of the spraying cubicle.
When fresh air is supplied to a treatment cubicle of the named type, it is necessary, with regard to the quality of the coating or paintwork of the objects to be treated such as vehicle bodies, to produce a high evenness of the air drop rate within the treatment cubicle. Turbulence or cross-flows both within and between the various work areas should be avoided inside the treatment cubicle, since--as a result of their negative influence on the paint application apparatus arranged in the treatment cubicle--they impair the quality of the coating result.
In the known treatment cubicle, the desired quantity of fresh air is supplied in a regulated manner via horizontally arranged flaps located in the through-apertures from the inlet air chamber to the individual sections of the air supply chamber. In order to remove the exhaust air, exhaust-air fans which draw off the cubicle air via a paint mist separator are located in the floor area of the treatment cubicle.
The known treatment cubicle suffers from the problem that the desired supplied quantity of air can be accurately adjusted only with a great deal of time and effort, since it is first also necessary to specify the adjustment predetermined by the removed quantity of air on the exhaust-air side as a basic setting for the supply within the individual sections of the supply side and then to adjust the quantities of supply air so as to reach the desired and actual guidance of inlet air inside the cubicle. Any emergent changes in operating conditions therefore entail a very complicated and time-consuming adjustment process, particularly when using inlet air flaps that have to be adjusted manually. Furthermore, a precise measurement of the quantity of inlet air is virtually impossible in the known prior art since an appropriate measurement requires a sufficiently long approach-flow length, and this is limited in the known treatment cubicles with a restricted design height.
SUMMARY OF THE INVENTION
A technical problem upon which the invention is based is to create a method of ventilating a treatment cubicle, in which method the quantity of fresh air to be supplied to the treatment cubicle is exactly determinable.
This technical problem is solved by a method of ventilating a treatment cubicle, in which method the fresh air to be supplied to the cubicle is supplied via an air-permeable ceiling, with an air supply chamber being arranged above the ceiling and communicating, via at least one aperture, with an inlet air chamber connected to a fresh-air supply system, and in which method the quant
REFERENCES:
patent: 5095811 (1992-03-01), Shutic et al.
Losch Manfred
Milojevic Dragoslav
ABB Flakt AB
Joyce Harold
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