U.S. patent application number 15/695500 was filed with the patent office on 2018-03-08 for low aspect ratio fan.
The applicant listed for this patent is MACROAIR TECHNOLOGIES, INC.. Invention is credited to EDWARD K. BOYD.
Application Number | 20180066667 15/695500 |
Document ID | / |
Family ID | 61281621 |
Filed Date | 2018-03-08 |
United States Patent
Application |
20180066667 |
Kind Code |
A1 |
BOYD; EDWARD K. |
March 8, 2018 |
LOW ASPECT RATIO FAN
Abstract
A fan with a housing a front face, a back face, and a side
portion extending between and securing together the front face and
the back face, and a duct extending from a top portion of the
housing for directing air flow. The fan further includes a rotor
secured within the housing, the rotor comprising a motor housing
and a plurality of arcuate blades, wherein the motor housing
comprises a plurality of interlocking recesses formed therein and
one end of each of the plurality of blades comprises an
interlocking pin, wherein the interlocking pin is received into a
respective interlocking recess in the motor housing for securing
the blade to the motor housing. Air is received into an inlet
formed into the front face of the housing and circulated over the
motor and the blades for cooling an area.
Inventors: |
BOYD; EDWARD K.; (GRAND
TERRACE, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MACROAIR TECHNOLOGIES, INC. |
SAN BERNADINO |
CA |
US |
|
|
Family ID: |
61281621 |
Appl. No.: |
15/695500 |
Filed: |
September 5, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
62383663 |
Sep 6, 2016 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04D 29/263 20130101;
F04D 29/281 20130101; F04D 17/16 20130101; F04D 29/4226 20130101;
F04D 25/082 20130101 |
International
Class: |
F04D 25/08 20060101
F04D025/08; F04D 17/16 20060101 F04D017/16; F04D 29/28 20060101
F04D029/28; F04D 29/42 20060101 F04D029/42 |
Claims
1. A fan comprising: a housing having a front face, a back face,
and a side portion extending between and securing together the
front face and the back face, and a duct extending from a top
portion of the housing for directing air flow; and a rotor secured
within the housing, the rotor comprising a motor housing and a
plurality of arcuate blades, wherein the motor housing comprises a
plurality of interlocking recesses formed therein and one end of
each of the plurality of blades comprises an interlocking pin,
wherein the interlocking pin is received into a respective
interlocking recess in the motor housing for securing the blade to
the motor housing; wherein: air is received into an inlet formed
into the front face of the housing and circulated over the motor
and the blades for cooling an area; and the fan has aspect ratio of
at least 3.
2. The fan of claim 1, wherein the fan has an aspect ratio of at
least 4.
3. The fan of claim 1, wherein the fan is equipped with a motor
configured to operate in the range of from 10 to 500 rotations per
minute and generate a constant torque of at least 13 NM.
4. The fan of claim 1, wherein the blades extend outwardly and
arcuately from the motor housing with an arc in the range of from
25 to 40 degrees.
Description
RELATED APPLICATION
[0001] This application claims the benefit of priority of U.S.
Provisional Application No. 62/383,663 filed Sep. 6, 2016.
FIELD
[0002] The invention disclosed herein is related to fans, and in
particular, low aspect ratio fans for use in rooms and structures
with space limitations.
BACKGROUND
[0003] Typical ceiling fans are generally mounted proximate the
ceiling and have a relatively large blade diameter. In general, the
greater the diameter of the fan, the larger the volume of air that
the fan is able to move. There are several problems that exist with
the use of typical ceiling fans in areas of limited space. One
problem with typical ceiling fans is the requirement of a space
above the fan blades which allow air flow into the fan from above.
Additionally, because of the exposed rotating fan blades, there is
a minimum height requirement to ensure the safety of those in
proximity to the fan. Ceiling fans are thus best suited for large,
mostly open spaces with ceilings that meet the minimum height
requirements to ensure that the fan has enough space to receive air
flow from above while maintaining the safety of those in the room
with the fan.
[0004] In areas with limited space, such as a shallow mezzanine
packing area with workers present, or a trailer that is pulled up
to a loading dock with forklift access, or a room with low
ceilings, it can be difficult to provide air movement, especially
with the problems presented by typical ceiling fans. A fan having a
large diameter and shallow profile that does not require space
between the fan blades and the ceiling, or a minimum safety
clearance, is desirable.
SUMMARY
[0005] Disclosed herein is a fan comprising a housing having a
front face, a back face, and a side portion extending between and
securing together the front face and the back face, and a duct
extending from a top portion of the housing for directing air flow.
A rotor is secured within the housing, and includes a motor housing
and a plurality of blades. The motor housing has a plurality of
interlocking recesses formed therein, and one end of each of the
plurality of blades comprises an interlocking pin. The interlocking
pin is received into a respective interlocking recess in the motor
housing for securing the blade to the motor housing. In use, air is
received into an inlet formed into the front face of the housing
and faned over the motor and the blades for cooling an area. The
ratio of the diameter of the rotor to the depth of the rotor is at
least 3.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 shows a front perspective view of a centrifugal fan
according to one embodiment of the invention;
[0007] FIG. 2 shows a close up side view of the centrifugal fan of
FIG. 1;
[0008] FIG. 3 shows a close up front view of the inlet of the
centrifugal fan of FIG. 1;
[0009] FIG. 4A shows a front view of the rotor without the housing
according to one aspect of the invention; and
[0010] FIG. 4B shows the rotor in combination with the housing
according to another aspect of the invention.
DETAILED DESCRIPTION
[0011] Embodiments of centrifugal fans designed for use in areas of
limited space are described herein. FIGS. 1-3 depict an exemplary
centrifugal fan 100 according to one embodiment of the invention.
The fan 100 includes a housing 105. The housing 105 may include a
front face 110 and a back face 115 with a side portion 120
extending between and securing together the front and back faces
110 and 115. The front and back face may have a U-shaped
configuration, for example. A duct 130 may extend from the top of
the "U" for exhausting air out of the fan 100. An air exhaust port
may exist on a single side, or multiple sides, depending upon the
particular needs of the user.
[0012] The front face 110 of the housing may be equipped with an
inlet opening 140 for receiving air into the fan 100. A rotor 150,
described below, may pull air from the central inlet 140 over the
motor and the blades for cooling an area. The air may also be drawn
over the motor, thereby preventing the motor from overheating.
[0013] The housing 105 may be manufactured from any acceptable
material, including plastic, metal or a synthetic material.
Moreover, the inlet 140 of the housing 110 may optionally be fitted
with an air filter. The air filter may be useful for filtering the
air flowing into the rotor by removing particulate matter from the
air flowing into the workspace. The filtered air may also help to
keep the blades clean for optimal fan performance. Finally, the
filter may also serve to keep foreign objects from contacting the
rotor.
[0014] The rotor 150, best illustrated by FIGS. 4A and 4B, may be
configured to be located inside the housing 105. The rotor 150 may
include a motor housing 155, and a set of blades 160 extending from
the motor housing 155. The rotor 150 may be manufactured using an
extrusion process, wherein a plurality of interlocking recesses may
be formed into the motor housing 155 and the end of the blades 160
that attach to the motor housing 155 include interlocking pins. For
example, the interlocking recesses and pins formed into the motor
housing 155 and the blades 160, respectively, may be in the shape
of a dovetail. To attach the blades 160 to the motor housing 155,
the blades 160 may be pressed into the interlocking recesses in the
motor housing 155. A device, such as a pin, spring loaded ball
bearing, or other locking mechanism may additionally be included to
prevent the blades 160 from separating from the motor housing 155.
Fan blades 160 in a preferred embodiment extend outwardly from the
motor housing 155 in a curved or arcuate fashion. The blades
preferably extend with an arc that is consistent for each set of
fan blades. The arc of each set of fan blades may range from 20 to
45 degrees depending upon the specific operational characteristics
desired for the specific fan.
[0015] It shall be understood that the rotor 150 may additionally,
or alternately, be functional without the housing 110 (FIG. 4A). In
situations in which the rotor is provided without the housing, air
from the fan may be dispersed in a 360-degree pattern.
[0016] Unlike most centrifugal fans, because the blades 160 are
secured to the motor housing 155 via the interlocking recesses and
pins, a back plate on the impeller 150 (or rotor) is not required
in order to keep the blades 160 secured to the motor housing 155.
This allows blades 160 to be added and/or removed to the motor
housing 155 easily without the need for expensive tooling or
alternative motor housings. For example, it may be desirable to
change out the blades 160 with larger (or smaller) blades to give
the fan a larger (or smaller) diameter. The blades 160 that are
attached to the motor housing 155 may be easily removed by sliding
the blades 160 out from the respective interlocking recesses, and
replacing the blades 160 with new blades 160 having the desired
size and/or shape. In this way, the load and performance of the fan
100 may be varied.
[0017] The interlocking system described above ensures a secure
connection between the motor housing 155 and the blades 160.
However, it also allows for the blades 160 to be manufactured
separately from the motor housing 155. This is important for the
reasons described above, as well as because an extruded rotor 150
that includes the motor housing 155 and the blades 160 as a single
piece may be cumbersome to manufacture and/or handle.
[0018] The fan 100 may be configured to have an aspect ratio of at
least 3, more preferably 4, and most preferably 5 or greater. The
aspect ratio of the fan 100 is defined as the ratio of the diameter
of the rotor 150 to the depth of the rotor 150. Most centrifugal
fans are very deep and have a small diameter, yielding a low aspect
ratio. For example, a prior art centrifugal fan may have a diameter
of 6 inches with a 12 inch depth. Thus, the aspect ratio of the
prior art fan is 1/2.
[0019] Conversely, the fan described herein may be very shallow
with a large diameter. In one embodiment of the invention, the fan
100 has a diameter of 25 inches and a 5 inch depth, yielding an
aspect ratio of 5. A higher aspect ratio allows a fan to move
considerable air in a room while consuming little space near the
ceiling of the structure.
[0020] The fan 100 may be equipped with a high-torque, low-speed
motor 170 that has a low-profile capable of being received into the
middle of the motor housing. The motor 170 may, for example, be
configured to operate in the range of from 10 to 500 rpm and
generate a constant torque of no less than 13 NM.
[0021] The fan 100 may be optionally mounted to a stand 200 such
that the fan 100 may be easily moved from one area to another.
Additionally, or alternately, the fan housing 105 may include a
bracket 125 for securing the housing 105 to structure.
[0022] Many different arrangements of the various components
depicted, as well as components not shown, are possible without
departing from the spirit and scope of the present invention.
Embodiments of the present invention have been described with the
intent to be illustrative rather than restrictive. Alternative
embodiments will become apparent to those skilled in the art that
do not depart from its scope. A skilled artisan may develop
alternative means of implementing the aforementioned improvements
without departing from the scope of the present invention. It will
be understood that certain features and subcombinations are of
utility and may be employed without reference to other features and
subcombinations and are contemplated within the scope of the
present invention.
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