Fan duct combination unit
First Claim
Patent Images
1. In a cross flow type fan/duct combination for moving gases, the improvement comprising:
- an intake duct spanning 160°
-180°
of the anterior face of the fan;
the upper surface of which curves downwardly to the point of closest approach to the fan at substantially the same curvature as the curvature of the impeller blades just anterior to a point where there is a substantial drop in power requirement at a given rpm combined with a substantial increase in gas velocity;
the lower surface of the intake duct'"'"'s closest approach to contact with the fan is located just anterior to the place where there is an increase in the substantially uniform air velocity external to the fan because of back flow from the fan/duct interface;
an exhaust duct which spans 100°
-120°
of the fan circumference at the lower rear of the fan where the lower surface of the exhaust duct is located at the point of closest approach of the rear exhaust duct to the fan and where the exhaust gas flow becomes substantially linear with little or no back flow into the intake duct; and
the upper surface is located at the point of closest approach of the upper surface of the exhaust duct to the fan is just above the point where there is a substantial reduction in exhaust gas velocity; and
a fan having essentially no internal vortex reducing mechanism and end disks with forward facing blades having an inner surface curvature of about 65°
to about 80° and
the inner surface of the outer ends of the blades is angled at about 30°
to 34°
from the vertical.
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Abstract
A modified cross flow fan 10, intake duct 25 and exhaust duct 26 combination has the intake duct 25 spanning 160°-180° of the anterior circumference of the fan 10. The location of the upper surface 27 adjacent fan 10 is determined by a substantially increasing power requirement and a substantial diminishing of exhaust gas outputs. The upper surface 26 near the fan 10 preferably has a curvature similar to the curvature of blades 12. The lowermost location of the lower surface 28 of the intake duct 25 is at the point of an increase in the relative vacuum of the external intake gas pressure.
The fan 10 has blades 12 creating an internal working space ratio of at least about 5:1. Blade 12 count will vary with intended usage and size, e.g., from 16-60 or more. Blades 12 are preferably angled at 50°-60° from the radius line of the fan 10 and have an inner surface curvature of 60°-80°.
The exhaust duct 26 spans 100°-120° of the fan'"'"'s circumference at the lower rear of fan 10. The upper surface 29 of exhaust duct 26 adjacent fan 10 is positioned at a point just below a substantial drop in exhaust gas velocity and the lower surface 31 curves under fan 10 to a point where the exhaust gas flow through the fan'"'"'s blades approaches linearity with surface 31 and there is minimal blowback.
47 Citations
12 Claims
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1. In a cross flow type fan/duct combination for moving gases, the improvement comprising:
-
an intake duct spanning 160°
-180°
of the anterior face of the fan;
the upper surface of which curves downwardly to the point of closest approach to the fan at substantially the same curvature as the curvature of the impeller blades just anterior to a point where there is a substantial drop in power requirement at a given rpm combined with a substantial increase in gas velocity;
the lower surface of the intake duct'"'"'s closest approach to contact with the fan is located just anterior to the place where there is an increase in the substantially uniform air velocity external to the fan because of back flow from the fan/duct interface;
an exhaust duct which spans 100°
-120°
of the fan circumference at the lower rear of the fan where the lower surface of the exhaust duct is located at the point of closest approach of the rear exhaust duct to the fan and where the exhaust gas flow becomes substantially linear with little or no back flow into the intake duct; and
the upper surface is located at the point of closest approach of the upper surface of the exhaust duct to the fan is just above the point where there is a substantial reduction in exhaust gas velocity; and
a fan having essentially no internal vortex reducing mechanism and end disks with forward facing blades having an inner surface curvature of about 65°
to about 80° and
the inner surface of the outer ends of the blades is angled at about 30°
to 34°
from the vertical.- View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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2. In a cross flow type fan for moving gases having an exhaust volume output to fan rpm relationship which is substantially linear over the fan operating range and exhaust duct combination having a fan with a plurality of end disks, the improvement comprising:
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an intake duct having an upper surface which curves downwardly toward the fan at substantially the same curvature as the curvature of the impeller blades at the point of closest approach to a location proximate to the upper surface of the fan just anterior to the point that there is substantially increasing power requirement combined with a substantial reduction in exhaust gas velocity and a lower surface that is positioned proximate to the fan at the point of an increase in the intake gas pressure external to the fan, an exhaust duct offset from the intake duct having an upper surface location adjacent to and below the point of a substantial drop in exhaust gas velocity and a lower surface location where the lower surface curves under and remains substantially separated from the fan to a point where the exhaust gas flow through the fan'"'"'s blades approaches linearity with the curvature of the lower surface of the duct adjacent to the fan and a cross flow type fan having no internal vortex reducing mechanism and forward facing blades having an inner surface curvature of about 65°
to about 80° and
the inner surface of the outer ends of the blades is angled at about 30°
to 34°
from the vertical.
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3. In a cross flow type fan for moving gases having an exhaust gas speed to blade tip speed relationship which is substantially linear, an intake duct and exhaust duct combination having a fan with a plurality of end disks and a greater plurality of impeller blades comprising:
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an intake duct having an upper surface which curves downwardly toward the fan at substantially the same curvature as the curvature of the impeller blades to a location proximate to the upper surface of the fan just lower than the point that there is an increasing power requirement combined with a substantial reduction in exhaust gas velocity and a lower surface that is positioned proximate to the fan substantially at the point of an increase in the intake gas pressure external to the fan, an exhaust duct offset from the intake duct having an upper surface location adjacent and below the point of a substantial drop in exhaust gas velocity and a lower surface location at the point where the lower surface curves under the fan to a point where the exhaust gas flow through the fan'"'"'s blades approaches substantial linearity with the curvature of the lower surface of the duct adjacent to the fan and a cross flow type fan having no internal vortex reducing mechanism, forward facing blades with an inner surface curvature of about 65°
to about 80° and
the inner surface of the outer ends of the blades is angled at about 30°
to 34°
from the vertical.
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Specification
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- Resources
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Current AssigneeGordon A. Kolacny
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Original AssigneeGordon A. Kolacny
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InventorsKolacny, Gordon A.
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Primary Examiner(s)Ryznic, John E.
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Application NumberUS09/145,458Time in Patent Office1,049 DaysField of Search415/53.1, 415/53.2, 415/53.3, 415/203, 415/224, 416/178, 416/187US Class Current415/53.3CPC Class CodesF01D 1/14 traversed by the working-fl...F03B 3/00 Machines or engines of reac...F04D 17/04 of transverse-flow typeF04D 29/30 VanesF05B 2240/244 of the cross-flow, e.g. Ban...Y02E 10/20 Hydro energy
