Ventilation – Having outlet airway – With air pump
Reexamination Certificate
1998-12-18
2001-12-18
Ferensic, Denise L. (Department: 3749)
Ventilation
Having outlet airway
With air pump
Reexamination Certificate
active
06331141
ABSTRACT:
The present invention relates to fluid extraction apparatus, particularly, but not exclusively, to apparatus for use in the pacification, purification or expulsion of a fluid, for example drawing a gas or liquid from a first area and transporting it to a second area at which it may optionally be treated. The present invention has particular application, but is not restricted, to use in the extraction and filtering of air containing impurities such as smoke, water vapour or oil vapour. Such an apparatus can be particularly useful in a cooking environment and could be employed in connection with a cooker hood above a cooking apparatus.
Normal extractor fans or cooker hoods generally use some form of fan in the path of the air to be extracted. Even if the fan is positioned downstream of a filter, oily impurities in the air can become deposited on the fan.
According to the present invention there is provided fluid extraction apparatus comprising:
a passage having an upstream end, a downstream end and a cross-sectional flow area for the pumped flow therealong of a first fluid in a downstream direction;
a fluid flow area control device having an upstream side and a downstream side and providing at said downstream side an increase in the available cross-sectional flow area of said passage between said upstream and downstream ends; and
an inlet to said passage at or downstream of said downstream side of said device;
whereby pumped flow of the first fluid along said passage past said device reduces the fluid pressure at said inlet to cause a second fluid to be drawn into said passage via said inlet to flow with the first fluid towards said downstream end.
Said fluid flow area control device advantageously provides an abrupt increase in the available cross-sectional first fluid flow area of said passage at its downstream side.
In a preferred arrangement the passage downstream of the fluid flow area control device is contained within a first conduit and a second conduit, for the supply of the second fluid to the inlet, branches into the first conduit at a branch junction.
The fluid flow area control device may take the form of a plug situated in the first conduit, with the passage passing though at least one aperture provided in the plug. The device may further comprise a hollow extension pipe extending downstream from the downstream side of the plug, beyond the branch junction, with the passage passing through the plug's aperture and through the pipe.
In an alternative arrangement a downstream portion of the second conduit extends into the first conduit, beyond the branch junction, and extends in the downstream direction. The exterior surface of the downstream portion of the second conduit can be spaced from the surrounding interior surface of the first conduit to form therebetween an annular space through which the passage passes. In this way the downstream portion of the second conduit forms the fluid flow area control device.
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An English Language abstract of DE 36 22 744.
Boles Derek S.
Ferensic Denise L.
Greenblum & Bernstein P.L.C.
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