U.S. patent application number 10/000307 was filed with the patent office on 2003-06-05 for smoke exhauster having an improved fan device.
Invention is credited to Chiang, Chao Cheng, Chiang, Chi Shyong.
Application Number | 20030101985 10/000307 |
Document ID | / |
Family ID | 21690904 |
Filed Date | 2003-06-05 |
United States Patent
Application |
20030101985 |
Kind Code |
A1 |
Chiang, Chao Cheng ; et
al. |
June 5, 2003 |
Smoke exhauster having an improved fan device
Abstract
A smoke exhauster includes a motor and a fan device attached to
a housing. The fan device includes an upper and a lower plates each
having an outer peripheral portion, and a number of fan blades
secured between the outer peripheral portions of the upper and the
lower plates for forming a chamber in the fan device. The lower
plate has a bore for air to flow or to be drawn into the chamber of
the fan device. The fan blades each has an inner section partially
extended inward of the bore of the lower plate and has a curvature
smaller than the other portion of the blade.
Inventors: |
Chiang, Chao Cheng;
(Taichung, TW) ; Chiang, Chi Shyong; (Taichung,
TW) |
Correspondence
Address: |
Chao Cheng Chiang
Chi Shyong Chiang
P.O. Box 63-99
Taichung
406
TW
|
Family ID: |
21690904 |
Appl. No.: |
10/000307 |
Filed: |
December 4, 2001 |
Current U.S.
Class: |
126/299R ;
126/299D |
Current CPC
Class: |
F24C 15/20 20130101 |
Class at
Publication: |
126/299.00R ;
126/299.00D |
International
Class: |
F24C 015/20 |
Claims
I claim:
1. A smoke exhauster comprising: a) a housing, b) a motor attached
to said housing, and c) a fan device attached to said motor and
driven by said motor, said fan device including: i) an upper plate
including an outer peripheral portion, ii) a lower plate including
an outer peripheral portion and including a bore formed therein,
and iii) a plurality of fan blades secured between said outer
peripheral portions of said upper and said lower plates for
defining a chamber between said upper and said lower plates and
said fan blades, said chamber of said fan device being
communicating with said bore of said lower plate for allowing air
to flow and to be drawn into said chamber of said fan device.
2. The smoke exhauster according to claim 1, wherein said upper and
said lower plates each includes a plurality of slits formed in said
outer peripheral portion thereof, said fan blades each includes an
upper and a lower portions each having at least one ear extended
therefrom and engaged through said slits of said upper and said
lower plates, for securing said fan blades between said outer
peripheral portions of said upper and said lower plates.
3. The smoke exhauster according to claim 1, wherein said motor
includes a lower portion, said upper plate includes a recess formed
therein for receiving said lower portion of said motor.
4. The smoke exhauster according to claim 1, wherein said motor
includes a spindle, said upper plate includes a hub secured thereto
and attached to said spindle of said motor, for securing said fan
device to said spindle of said motor.
5. The smoke exhauster according to claim 1, wherein said fan
blades each includes a first section partially extended inward of
said bore of said lower plate.
6. The smoke exhauster according to claim 5, wherein said fan
blades each includes a second section extended from said first
section and disposed between said outer peripheral portions of said
upper and said lower plates, said second section includes a
curvature greater than that of said first section of said fan
blade.
7. The smoke exhauster according to claim 6, wherein said fan
blades each includes a third section extended from said second
section and disposed between said outer peripheral portions of said
upper and said lower plates, said second section includes a
curvature less than that of said third section of said fan blade.
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 having an improved fan device for
drawing much air or for increasing the air drawing effect.
[0003] 2. Description of the Prior Art
[0004] The applicant has developed various kinds of 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. U.S.
Pat. No. 5,979,436 to Chiang et al. discloses one of the typical
smoke exhausters. 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 therein and include a limited or a small
area for actuating the air.
[0005] The present invention has arisen to mitigate and/or obviate
the afore-described disadvantages of the conventional smoke
exhausters.
SUMMARY OF THE INVENTION
[0006] The primary objective of the present invention is to provide
a smoke exhauster including an improved fan device for drawing much
air or for increasing the air drawing effect to the fan device.
[0007] In accordance with one aspect of the invention, there is
provided a smoke exhauster comprising a housing, a motor attached
to the housing, and a fan device attached to the motor and driven
by the motor, the fan device including an upper plate including an
outer peripheral portion, a lower plate including an outer
peripheral portion and including a bore formed therein, and a
plurality of fan blades secured between the outer peripheral
portions of the upper and the lower plates for defining a chamber
between the upper and the lower plates and the fan blades, the
chamber of the fan device being communicating with the bore of the
lower plate for allowing air to flow and to be drawn into the
chamber of the fan device.
[0008] The upper and the lower plates each includes a plurality of
slits formed in the outer peripheral portion thereof, the fan
blades each includes an upper and a lower portions each having at
least one ear extended therefrom and engaged through the slits of
the upper and the lower plates, for securing the fan blades between
the outer peripheral portions of the upper and the lower
plates.
[0009] The motor includes a lower portion, the upper plate includes
a recess formed therein for receiving the lower portion of the
motor. The motor includes a spindle, the upper plate includes a hub
secured thereto and attached to the spindle of the motor, for
securing the fan device to the spindle of the motor.
[0010] The fan blades each includes a first section partially
extended inward of the bore of the lower plate. The fan blades each
includes a second section extended from the first section and
disposed between the outer peripheral portions of the upper and the
lower plates, the second section includes a curvature greater than
that of the first section of the fan blade.
[0011] The fan blades each includes a third section extended from
the second section and disposed between the outer peripheral
portions of the upper and the lower plates, the second section
includes a curvature less than that of the third section of the fan
blade.
[0012] Further objectives and advantages of the present invention
will become apparent from a careful reading of a detailed
description provided hereinbelow, with appropriate reference to
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 is a partial exploded view of a smoke exhauster in
accordance with the present invention;
[0014] FIG. 2 is a partial exploded view of the fan device;
[0015] FIG. 3 is a top plan view of the fan device, in which a
portion of the upper plate has been cut off for showing the inner
structure of the fan device;
[0016] FIG. 4 is a perspective view of one of the fan blades;
and
[0017] FIG. 5 is a top plan view of the fan blade.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0018] Referring to the drawings, and initially to FIG. 1, a smoke
exhauster in accordance with the present invention comprises a
housing 10, a motor 11 secured to the ceiling or the top panel 13
of the housing 10, and a fan device 30 attached or secured to the
spindle 12 of the motor 11 for being actuated or driven by the
motor 11. The top panel 13 of the housing 10 includes an orifice 14
formed therein for air circulation purposes. A casing 16 is engaged
onto the fan device 30 and secured to the top panel 13 of the
housing 10, for covering or shielding the peripheral portion of the
fan device 30, and includes an opening 17 formed therein and
aligned with the fan device 30 for allowing the air to be drawn
into the casing 16 by the fan device 30. The casing 16 includes a
conduit 18 formed or provided therein and directed toward the
orifice 14 of the housing 10 for directing the air out through the
orifice 14 of the housing 10. A board 15 is attached or secured to
the bottom of the housing 10 for covering or shielding the housing
10, and includes an aperture 19 formed therein and aligned with the
opening 17 of the casing 16 for allowing the air to be drawn
through the aperture 19 of the board 15 and drawing into the casing
16 by the fan device 30.
[0019] Referring next to FIGS. 2-4, the fan device 30 includes an
upper plate 31 having a recess or a depression 32 formed in the
upper portion thereof for receiving the lower portion of the motor
11, and having a hub 33 attached thereto for receiving or for
securing to the spindle 12 of the motor 11. The upper plate 31
includes an outer peripheral portion having a number of slits 34
formed therein, particularly having a number pairs of slits 34
formed therein. A lower plate 36 is disposed below the upper plate
31 and to be secured to the upper plate 31 with a number of fan
blades 40, and for forming a chamber 37 between the upper and the
lower plates 31, 36 and the fan blades 40. The lower plate 36
includes a bore 38 formed therein for forming or defining a
circular shape to the lower plate 36, and communicating with the
chamber 37 of the fan device 30, for allowing the air to flow and
to be drawn into the chamber 37 of the fan device 30. The lower
plate 36 includes a number of slits 39 formed therein, particularly
having a number pairs of slits 39 formed therein.
[0020] The fan blades 40 each includes an upper portion having one
or more ears 41 extended upward therefrom and engaged through the
slits 34 of the upper plate 31 and bent or secured to the upper
plate 31, for securing the fan blades 40 to the upper plate 31. The
fan blades 40 each includes a lower portion having one or more ears
42 extended downward therefrom and engaged through the slits 39 of
the lower plate 36 and bent or secured to the lower plate 36, for
securing the fan blades 40 to the lower plate 36. The fan blades 40
may thus be solidly secured between the outer peripheral portions
of the upper and the lower plates 31, 36.
[0021] As best shown in FIGS. 3 and 5, the fan blades 40 each
includes a first or an inner section 43 having a portion extended
inward of the bore 38 of the lower plate 36; a second or an
intermediate section 44 extended from the inner section 43 and
disposed between the upper and the lower plates 31, 36; and a third
or an outer section 45 disposed between the upper and the lower
plates 31, 36, or having the tip portion of the outer edge 47
slightly extended radially outward of the upper and the lower
plates 31, 36, best shown in FIG. 3. The portion of the inner
section 43 of the fan blade 40 that extends inward of the bore 38
of the lower plate 36 may be used for scooping the air in the
chamber 37 of the fan device 30.
[0022] As best shown in FIG. 5, the inner section 43 of the fan
blade 40 includes a curvature or a semidiameter R1 preferably less
than the curvature or the semidiameter R2 of the intermediate
section 44, for increasing the air scooping effect of the fan
blades 40 and the air drawing effect of the fan device 30. The
curvature or the semidiameter R2 of the intermediate section 44 is
preferably less than the curvature or the semidiameter R3 of the
outer section 45. As shown in FIGS. 2 and 4, the inner sections 43
of the fan blades 40 each includes a rounded lower corner 48 for
reducing the eddy current and for reducing the noise while the fan
device 30 is actuated or energized.
[0023] As shown in FIG. 1, the smoke exhauster is shown and
illustrated to include a single fan device 30 attached to the
housing 10 and driven by one motor 11. Certainly, the smoke
exhauster may also include two or more fan devices 30 attached to
the housing 10 and each driven by one motor 11.
[0024] Accordingly, the smoke exhauster in accordance with the
present invention includes an improved fan device for drawing much
air or for increasing the air drawing effect to the fan device.
[0025] 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.
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