Ventilation – Workstation ventilator
Patent
1990-02-09
1992-07-28
Joyce, Harold
Ventilation
Workstation ventilator
454 65, 454 67, F23J 1100
Patent
active
051336898
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a focussed ventilation method and a focussed ventilation of a work space.
Focussed ventilation apparatus for air impurities are known in the art, wherein suction is focussed on a source of impurity of each work space. Impurities are drawn off from the job target prior to coming into contact with the person working at the work space. However, in the focussed ventilation procedures of the prior art it has not been feasible to remove impurities to a sufficient extent. Therefore, a relatively high concentration of impurities has entered the respiratory zone of the person working in the work place.
SUMMARY OF THE INVENTION
The object of the invention is a completely novel focussed ventilation method and a focussed ventilation apparatus. Specifically, the aim is a method and an apparatus in which majority of the impurities can be removed from the work spot prior to their transmission into the zone of the person working in the work space.
The method of the invention comprises bringing the majority of the air space of the person working in the work space is with the aid of the suction of a suction apparatus into movement. The air of the work space is drawn with the aid of a first focussed suction and additional focussed suction. With the aid of the first focussed suction most of the impurity concentration and/or excess heat is/are removed, and with the aid of the additional focussed suction the residual impurities and/or excess heat is/are removed.
The method of the invention is mainly characterized in that at least a first focussed suction and at least one additional focussed suction are used, these being arranged to draw the air and/or gas and/or excess heat of the work spot and to interact so that the first focussed suction draws off the air which is more detrimental in quality than the air drawn off by the additional focussed suction.
The focussed ventilation apparatus of the invention is mainly characterized in that the apparatus comprises at least one suction duct for the actual focussed suction, through which duct a majority of the impurities and/or excess heat produced in the work space is/are removed, and that the apparatus comprises at least one suction duct for additional suction, through which duct residual impurities are removed from the work space.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in the following referring to a number of advantageous embodiments of the invention presented in the Figures of the drawing but to which the invention is not intended to be exclusively confined.
FIG. 1 presents a schematic view the most common embodiment of the procedure of the invention and the means of the invention.
FIG. 2A presents schematically an embodiment of the invention as a cross-sectional image in which the apparatus comprises a central suction duct and a second suction duct therearound.
FIG. 2B presents schematically a portion of the embodiment of FIG. 1 provided with an edge flange.
FIG. 3 presents a third advantageous embodiment of the method and the apparatus of the invention in axonometric image.
FIGS. 4A-4D present the flow curves of the apparatus embodiment of FIG. 3. FIGS. 4A-4D are sections taken along lines I--I of FIG. 3. In FIG. 4D is presented the distribution of impurity concentration in flow cross-section surfaces.
FIG. 5 presents schematically apparatus used for adjusting focussed suctions of the focussed ventilation means.
FIGS. 6A-6C present duct cross-sections related to the embodiment shown in FIGS. 2A and 2B.
FIG. 7 presents a movable focussed ventilation means.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 presents schematically a first embodiment of the procedure of the invention. The figure shows a person working at a work spot, e.g. a welder. As taught by the invention, two separate suctions are directed at the work spot. The focussed ventilation apparatus 10 comprises means 12 generating the first focussed suction 11 with which first focussed suction is focussed directly on the source of impurities from the suction du
REFERENCES:
patent: 2567776 (1951-09-01), Lundy
patent: 2579401 (1951-12-01), Schneible et al.
patent: 3880061 (1975-04-01), Hensiek et al.
patent: 4134331 (1979-01-01), Bender
Aalto Erkki
Eloranta Jouko
Pellinen Teuvo
Halton Oy
Joyce Harold
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