Coating apparatus – With means to apply electrical and/or radiant energy to work... – With electromagnetic and/or electrostatic removal of...
Patent
1986-05-30
1988-01-26
Wayner, William E.
Coating apparatus
With means to apply electrical and/or radiant energy to work...
With electromagnetic and/or electrostatic removal of...
118326, 118634, 118DIG7, B05B 1512
Patent
active
047210338
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to spray booths, and in particular to a method and apparatus for removing paint or other sprayed material from the air exhausted from a spray booth.
It is customary to extract air from a paint spray booth and to wash it with a cleaning liquid, generally water, to remove the paint entrained in the exhaust air. Examples of washing systems for the exhaust air from paint spray booths are described in British Patent specifications Nos. 1165022, 1399805, and 2007542B.
The washing systems described in the above identified patent specifications generally exhibit their best efficiency if a substantially constant volume of air flows therethrough. If the volume of air or the air speed varies, the characteristic performance of the washing systems varies. This can present a problem in that it may be required to vary the volume of air flowing through the paint spray booth. Clearly if the air flow is so varied the efficiency of the washing systems can be impaired.
In some applications the volume of air flow through the booth must be reduced, and in other applications the volume of air flow can be substantially reduced without adversely affecting the painting operation. As the air supplied to the booth is generally conditioned to be at a predetermined temperature and humidity, any such reduction in the volumes used represents a substantial energy saving.
Thus, when human operators are working in a spray booth, the downward air speed is normally required to be at least 0.5 m/sec. This air speed is not required for the painting operation itself, and if automatic applicators are used, the air velocity can be reduced to 0.3 m/sec or even less.
The present invention seeks to provide a spray booth through which the air flow rates can be varied without impairing the efficiency of the washing systems.
According to the present invention there is provided a spray booth comprising an enclosure in which material is sprayed, an air inlet path in communication with said enclosure, means for extracting air laden with the sprayed material from said enclosure, and apparatus for removing the sprayed material from the material laden extracted air, said apparatus comprising washing means through which said material laden air is arranged to flow in intimate contact with a cleaning liquid, characterized in that at least two physically separate air outlet paths for said extracted air are provided, in that respective apparatus for removing sprayed material is associated with each said air outlet path, and in that means are provided for controlling the volume of air flowing through each said outlet path.
In an embodiment, a substantially horizontally extending sub-floor is arranged at the base of the enclosure to define an air outlet chamber in communication with the enclosure, and one or more substantially vertically extending partitions are arranged to divide said air outlet chamber into two or more separate chambers each constituting a respective air outlet path.
Preferably, each said washing means comprises one or more tubular members extending substantially vertically within the respective separate chamber and passing through said sub-floor. Means for supplying cleaning liquid are arranged to supply the cleaning liquid onto said sub-floor such that the cleaning liquid passes through the tubular members in intimate contact with said material laden air. The tubular members may project relative to the sub-floor such that a pond for the cleaning liquid is defined on the upper surface of the sub-floor.
In one embodiment, said substantially vertically extending partitions project relative to the sub-floor and thereby divide the upper surface thereof into sections, each section being associated with a respective separate chamber. Separate cleaning liquid supply means may then be provided for each section of the sub-floor.
The tubular members extending through the sub-floor may be circular, rectangular or any other shape in cross section, and these members may be of any size.
The sub-floor is preferably spaced above a f
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patent: 4285270 (1981-08-01), Donahue
patent: 4425870 (1984-01-01), Marshke
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patent: 4515073 (1985-05-01), Dorsch et al.
patent: 4537120 (1985-08-01), Josefsson
Bloomer Ivan
Lynham Ian H.
Haden Drysys International Limited
Warner Steven E.
Wayner William E.
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