U.S. patent application number 11/799092 was filed with the patent office on 2008-10-30 for fan device for smoke exhauster.
Invention is credited to Chao-Cheng Chiang, Chi-Hsiung Chiang, I-Wen Chiang.
Application Number | 20080267779 11/799092 |
Document ID | / |
Family ID | 39887192 |
Filed Date | 2008-10-30 |
United States Patent
Application |
20080267779 |
Kind Code |
A1 |
Chiang; Chi-Hsiung ; et
al. |
October 30, 2008 |
Fan device for smoke exhauster
Abstract
A fan device for a smoke exhauster includes a housing having an
upper plate and a lower plate, and the upper plate is secured to a
motor and rotated by the motor, the lower plate includes a bore to
allow an air to flow into the housing of the fan device, and a
number of fan blades secured between the upper plate and the lower
plate and each fan blade include a curved bottom edge to allow the
air to flow into the chamber of the fan device before contacting
with the fan blades, and the fan blades each include a number of
orifices for reducing a noise generated by the fan blades when the
fan blades are rotated relative to the motor. The fan blades are
preferably disposed inclined relative to the upper plate and the
lower plate.
Inventors: |
Chiang; Chi-Hsiung;
(Taichung Hsien, TW) ; Chiang; I-Wen; (Taichung
Hsien, TW) ; Chiang; Chao-Cheng; (Taichung Hsien,
TW) |
Correspondence
Address: |
CHARLES E. BAXLEY, ESQUIRE
90 JOHN STREET, SUITE 309
NEW YORK
NY
10038
US
|
Family ID: |
39887192 |
Appl. No.: |
11/799092 |
Filed: |
April 30, 2007 |
Current U.S.
Class: |
416/178 |
Current CPC
Class: |
F04D 29/666
20130101 |
Class at
Publication: |
416/178 |
International
Class: |
F04D 29/30 20060101
F04D029/30 |
Claims
1. A fan device for a smoke exhauster comprising: a housing
including an upper plate, and a lower plate disposed below said
upper plate for forming a chamber between said upper plate and said
lower plate, said upper plate including a plurality of slits formed
therein, said lower plate including a plurality of slots formed
therein, and including a bore formed therein, and said upper plate
including a casing provided therein, said chamber of said fan
device being communicating with said bore of said lower plate to
allow an air to flow through said bore of said lower plate and to
flow into said chamber of said fan device, a motor received in said
casing of said upper plate and including a spindle secured to said
casing of said upper plate of said housing for allowing said casing
of said housing to be rotated and driven by said spindle of said
motor and to be rotated relative to said motor, and a plurality of
fan blades disposed in said chamber which is formed between said
upper plate and said lower plate of said housing, said fan blades
each including an upper portion having a plurality of ears extended
upwardly therefrom and engaged through said slits of said upper
plate for securing said fan blades to said upper plate, and each
including a lower portion having a plurality of ears extended
downwardly therefrom and engaged through said slots of said lower
plate for securing said fan blades to said lower plate and for
securing said fan blades between said upper plate and said lower
plate, and said fan blades each including a curved bottom edge
curved inwardly and upwardly from said lower plate toward said
upper plate to allow the air to flow into said chamber of said fan
device before contacting with said fan blades, and said fan blades
each including a plurality of orifices formed therein for allowing
the air to flow through said orifices of said fan blades and for
reducing a noise generated by said fan blades when said fan blades
are rotated relative to said motor.
2. The smoke exhauster as claimed in claim 1, wherein said fan
blades each includes a curved outer segment, and a planar inner
segment.
3. The smoke exhauster as claimed in claim 1, wherein said fan
blades are disposed inclined relative to said upper plate and said
lower plate for increasing an air scooping effect of said fan
blades.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a smoke exhauster, and more
particularly to a smoke exhauster including an improved fan device
for increasing the air drawing effect thereof and for reducing the
noise that may be generated by the smoke exhauster.
[0003] 2. Description of the Prior Art
[0004] The applicants have developed various kinds of typical smoke
exhausters which comprise one or more centrifugal fan devices each
having a fan casing and a number of radially extended fan blades
directly punched or forged or extended from the fan casing.
[0005] For example, U.S. Pat. No. 5,158,429 to Chiang et al.
discloses one of the typical smoke exhausters comprising a number
of radially extended fan blades directly punched or forged or
extended from the fan casing for agitating the air or the like and
for generating a circulating air. Due to the directly punching or
forming of the fan blades from the fan casing, the fan blades may
only be formed with a single curvature and may include a limited or
a small area for actuating the air.
[0006] For increasing the air drawing effect to the fan device, the
applicants have further developed various kinds of typical smoke
exhausters comprising a fan device including a number of preformed
fan blades to be assembled and secured between two casing members
for increasing the air drawing effect to the fan devices.
[0007] For example, U.S. Pat. No. 6,866,481 to Chiang et al., and
U.S. Pat. No. 6,945,753 to Chiang et al. discloses two of the
typical smoke exhausters each comprising a fan device including a
number of preformed and curved and suitably shaped fan blades to be
assembled and secured between an upper plate and a lower plate for
increasing the air drawing effect to the fan devices.
[0008] However, the fan blades include a solid structure that may
generate a great noise particularly when the fan blades are rotated
or driven or operated in a great speed.
[0009] The present invention has arisen to mitigate and/or obviate
the afore-described disadvantages of the conventional smoke
exhausters.
SUMMARY OF THE INVENTION
[0010] The primary objective of the present invention is to provide
a smoke exhauster including an improved fan device for increasing
the air drawing effect thereof and for reducing the noise that may
be generated by the smoke exhauster.
[0011] In accordance with one aspect of the invention, there is
provided a fan device for a smoke exhauster comprising a housing
including an upper plate, and a lower plate disposed below the
upper plate for forming a chamber between the upper plate and the
lower plate, the upper plate including a number of slits formed
therein, the lower plate including a number of slots formed
therein, and including a bore formed therein, and the upper plate
including a casing provided therein, the chamber of the fan device
being communicating with the bore of the lower plate to allow an
air to flow through the bore of the lower plate and to flow into
the chamber of the fan device, a motor received in the casing of
the upper plate and including a spindle secured to the casing of
the upper plate of the housing for allowing the casing of the
housing to be rotated and driven by the spindle of the motor and to
be rotated relative to the motor, and a number of fan blades
disposed in the chamber which is formed between the upper plate and
the lower plate of the housing, the fan blades each include an
upper portion having a number of ears extended upwardly therefrom
and engaged through the slits of the upper plate for securing the
fan blades to the upper plate, and each include a lower portion
having a number of ears extended downwardly therefrom and engaged
through the slots of the lower plate for securing the fan blades to
the lower plate and for securing the fan blades between the upper
plate and the lower plate, and the fan blades each include a curved
bottom edge curved inwardly and upwardly from the lower plate
toward the upper plate to allow the air to flow into the chamber of
the fan device before contacting with the fan blades, and the fan
blades each include a number of orifices formed therein for
allowing the air to flow through the orifices of the fan blades and
for reducing a noise generated by the fan blades when the fan
blades are rotated relative to the motor.
[0012] The fan blades each includes a curved outer segment, and a
planar inner segment. The fan blades are preferably disposed
inclined relative to the upper plate and the lower plate for
increasing an air scooping effect of the fan blades.
[0013] Further objectives and advantages of the present invention
will become apparent from a careful reading of the detailed
description provided hereinbelow, with appropriate reference to the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a partial exploded view of a fan device for a
smoke exhauster in accordance with the present invention;
[0015] FIG. 2 is a bottom perspective view of the fan device for
the smoke exhauster;
[0016] FIG. 3 is a bottom plan schematic view of the fan device for
the smoke exhauster;
[0017] FIG. 4 is a side plan schematic view of the fan device for
the smoke exhauster;
[0018] FIG. 5 is an upper plan schematic view of the fan device for
the smoke exhauster;
[0019] FIG. 6 is a partial exploded and partial cross sectional
view of the fan device for the smoke exhauster taken along lines
6-6 of FIG. 5, illustrating the inner structure of the fan device
for the smoke exhauster.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0020] Referring to the drawings, and initially to FIGS. 1-5,
illustrated is a fan device 1 for attaching or engaging into an
outer receptacle (not shown) of a smoke exhauster in accordance
with the present invention, the fan device 1 comprises a housing 10
including an upper plate 11 having a recess or depression or
concave 12 formed in the upper portion thereof, or including a
casing 13 provided or formed in the middle portion of the upper
plate 11 and having the recess or depression or concave 12 formed
in the middle portion of the casing 13 for receiving a motor 30
(FIGS. 5, 6), and including a tube or barrel or hub 14 provided or
formed or extended outwardly from the middle or center portion of
the casing 13 for receiving a spindle 31 that is extended outwardly
from the lower portion of the motor 30 (FIGS. 1-3 and 6), and one
or more fasteners 16 may be used to secure the spindle 31 of the
motor 30 to the hub 14 of the casing 13.
[0021] The motor 30 may further include a frame or bracket 32
(FIGS. 5, 6) for attaching or securing to the outer receptacle (not
shown) of the smoke exhauster and thus for allowing the casing 13
of the housing 10 to be rotated or driven by the spindle 31 of the
motor 30 and to be rotated relative to the motor 30 and the outer
receptacle of the smoke exhauster. The upper plate 11 includes a
number of slits 17, 18, such as two rows or two circles of slits
17, 18 formed therein (FIGS. 1, 5) for attaching or securing a
number of fan blades 40 to the upper plate 11 of the housing 10.
The rows or two circles of slits 17, 18 preferably include
different inclinations or are inclined relative to each other, best
shown in FIG. 1. The housing 10 further includes a lower plate 20
disposed below the upper plate 11 and to be secured to the upper
plate 11 with the fan blades 40, and for forming a space or chamber
21 between the upper plate 11 and the lower plate 20.
[0022] The lower plate 20 includes a bore 22 formed therein (FIGS.
1-3) and communicating with the chamber 21 of the housing 10 of the
fan device 1, for allowing the air to be drawn through the bore 22
of the lower plate 20 and to be drawn into the chamber 21 of the
housing 10 of the fan device 1. The lower plate 20 includes a
number of slots 23 formed therein (FIGS. 1-3) and also provided for
attaching or securing the fan blades 40 to the lower plate 20 of
the housing 10. Each of the fan blades 40 include an upper portion
41 having one or more ears 42 extended upwardly therefrom and
engaged through the slits 17, 18 of the upper plate 11, and bent or
secured to the upper plate 11, for securing the fan blades 40 to
the upper plate 11. Each of the fan blades 40 further include a
lower portion 43 having one or more ears 44 extended downwardly
therefrom and engaged through the slots 23 of the lower plate 20,
and bent or secured to the lower plate 20, for securing the fan
blades 40 to the lower plate 20.
[0023] The fan blades 40 may thus be solidly attached and secured
between the outer peripheral portion of the upper plate 11 and the
lower plate 20. As shown in FIG. 1, each of the fan blades 40
include a curved lower or bottom portion or edge 45 curved inwardly
and upwardly from the lower plate 20 toward the upper plate 11
and/or the casing 13 of the housing 10. As shown in FIGS. 1-3, each
of the fan blades 40 include a first or outer curved segment 46 and
a second or inner planar segment 47 for scooping the air in the
chamber 21 of the housing 10. It is preferable that the curved
outer segment 46 of the fan blade 40 includes a width equals to or
greater than that of the lower plate 20 of the housing 10, but
smaller than that of the planar inner segment 47 of the fan blade
40. The above-described structure for the housing 10 of the fan
device 1 has been disclosed and patented in U.S. Pat. No. 6,945,753
to Chiang et al.
[0024] The fan blades 40 of the housing 10 of the fan device 1 each
further include a number of orifices 48 formed therein for allowing
the air to flow through the orifices 48 of the fan blades 40 and
for reducing the noise that may be generated by the fan blades 40
when the fan blades 40 are rotated or driven or operated in a great
speed. The fan blades of the typical fan devices have no noise
reducing orifices formed in the fan blades such that the fan blades
of the typical fan devices may generate great noises particularly
when the fan blades are rotated or driven or operated in a great
speed. It is to be noted that a single fan device 1 has been shown
and illustrated in FIGS. 1-6 of the drawing figures, and the smoke
exhauster may include two or more fan devices 1 attached to the
outer receptacle of the smoke exhauster and each driven by one
motor 30.
[0025] It is further to be noted that the fan blades 40 are shown
in the drawing figures to be secured between the upper plate 11 and
the lower plate 20, and the fan blades 40 may be disposed or
arranged perpendicular to the upper plate 11 and the lower plate
20, or the fan blades 40 may be arranged or disposed to be tilted
or inclined relative to the upper plate 11 and the lower plate 20,
best shown in FIGS. 4 and 6, for increasing the air drawing or
scooping effect of the fan blades 40. In operation, as shown in
FIGS. 1-3 and 6, due to the formation or provision of the curved
lower or bottom edges 45 of the fan blades 40, the fan device 1 may
include a widely opened lower portion formed and defined by the
bore 22 of the lower plate 20 and the chamber 21 of the fan device
1, for allowing the air to flow through the bore 22 of the lower
plate 20 and deeper into the chamber 21 of the fan device 1, before
the air may be contacted and scooped by the fan blades 40.
[0026] The formation or provision of the orifices 48 in the fan
blades 40 allows the air to flow through the orifices 48 of the fan
blades 40 and to reduce the noise that may be generated by the fan
blades 40, and the inclination of the fan blades 40 relative to the
upper plate 11 and the lower plate 20 may further increase the air
drawing or scooping effect of the fan blades 40.
[0027] Accordingly, the smoke exhauster in accordance with the
present invention includes an improved fan device for increasing
the air drawing effect thereof and for reducing the noise that may
be generated by the smoke exhauster.
[0028] Although this invention has been described with a certain
degree of particularity, it is to be understood that the present
disclosure has been made by way of example only and that numerous
changes in the detailed construction and the combination and
arrangement of parts may be resorted to without departing from the
spirit and scope of the invention as hereinafter claimed.
* * * * *