U.S. patent application number 13/863430 was filed with the patent office on 2013-09-05 for hot air blower.
This patent application is currently assigned to Pro-Iroda Industries, Inc.. The applicant listed for this patent is PRO-IRODA INDUSTRIES, INC.. Invention is credited to Wei-Long Chen.
Application Number | 20130228232 13/863430 |
Document ID | / |
Family ID | 49042131 |
Filed Date | 2013-09-05 |
United States Patent
Application |
20130228232 |
Kind Code |
A1 |
Chen; Wei-Long |
September 5, 2013 |
Hot Air Blower
Abstract
A hot air blower includes a shell including a fan mechanism, a
combustion device, a vane mechanism, and a flame protector disposed
therein. The vane mechanism includes a clipping seat and a
plurality of guiding vanes extended thereon. The plurality of
guiding vanes extend obliquely and prevents the air passing through
the vane mechanism from generating turbulence. The clipping seat
and the flame protector form a half-closed combustion chamber
therebetween. Heat in the half-closed combustion chamber causes a
thermal expansion of the air and, thereby increasing a speed and a
volume of the air passing the guiding vanes of the vane mechanism.
Heated air is discharged from an external flow tube and which
controls a heating range of an area of the hot air blower.
Inventors: |
Chen; Wei-Long; (Taichung
City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
PRO-IRODA INDUSTRIES, INC. |
Taichung City |
|
TW |
|
|
Assignee: |
Pro-Iroda Industries, Inc.
Taichung City
TW
|
Family ID: |
49042131 |
Appl. No.: |
13/863430 |
Filed: |
April 16, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13629729 |
Sep 28, 2012 |
|
|
|
13863430 |
|
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|
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Current U.S.
Class: |
137/335 |
Current CPC
Class: |
F24H 3/0423 20130101;
Y10T 137/6443 20150401; F24H 9/00 20130101 |
Class at
Publication: |
137/335 |
International
Class: |
F24H 9/00 20060101
F24H009/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 2, 2012 |
TW |
101106960 |
Claims
1. A hot air blower comprising: a shell; a fuel canister, a fan
mechanism, a combustion device, a vane mechanism, and a flame
protector disposed within the shell, with the fan mechanism blowing
air, with the combustion device including a burning end for giving
out heat of combustion, with the vane mechanism disposed in a
position making the combustion device locate between the fan
mechanism and the vane mechanism, with the vane mechanism including
a clipping seat and a plurality of guiding vanes, with each of the
plurality of guiding vanes extending obliquely on the clipping seat
and make as a one-piece structure to prevent air passing through
the vane mechanism from generating turbulence and to achieve a
flow-regulating effect; with the flame protector disposed in the
vane mechanism and hooding the burning end of the combustion
device, with the air passing the vane mechanism able to be expelled
out of the flame protector, with the clipping seat and the flame
protector forming a half-closed combustion chamber therebetween,
with heat in the half-closed combustion chamber causing a thermal
expansion of the air and thereby increasing a speed and a volume of
the air passing the guiding vanes of the vane mechanism; and an
external flow tube fixed in and extended out of the shell, with
heated air discharged out of the hot air blower from the external
flow tube and which controls a heating range of an area of the hot
air blower.
2. The hot air blower as claimed in claim 1, wherein the plurality
of vents are circumferentially disposed on the flame protector.
3. The hot air blower as claimed in claim 1 further comprising an
internal flow tube disposed within the shell, wherein the internal
flow tube includes a periphery delimiting a cavity, and the
combustion device and the vane mechanism are disposed in the cavity
of the internal flow tube, and the external flow tube includes a
first end fixed to the internal flow tube and a second end extended
out of the shell.
4. The hot air blower as claimed in claim 3, wherein the flow tube
includes a cavity extended therethrough from the first end to the
second end thereof, and the flame protector is extended in the
cavity of external flow tube.
5. The hot air blower as claimed in claim 1, wherein the combustion
device is connected with a first fuel line, and the clipping seat
includes a heating tube mounted thereon.
6. The hot air blower as claimed in claim 5, wherein the heating
tube includes two legs extended separately with one leg connected
with the first fuel line and the other leg connected with a second
fuel line respectively.
7. The hot air blower as claimed in claim 6, wherein the heating
tube is disposed in front of the fan mechanism and aside of the
combustion device, and the combustion device is able to give off
heat energy to the heating tube and prevent fuel condensed and
clogged therein.
8. The hot air blower as claimed in claim 6, wherein the heating
tube is disposed outside the clipping seat and adjacent to the
plurality of guiding vanes.
9. The hot air blower as claimed in claim 6, wherein the heating
tube is disposed in the clipping seat.
10. The hot air blower as claimed in claim 1, wherein the shell
includes first and second outer shells symmetrically joined to each
other.
11. The hot air blower as claimed in claim 10, wherein the first
and second shells include first and second clamping collars
disposed therein and holding the internal flow tube fixedly inside
the shell.
12. The hot air blower as claimed in claim 1, wherein the fan
mechanism includes a fan and a flow-regulating sleeve, encasing the
fan.
13. The hot air blower as claimed in claim 1, wherein the shell is
substantially T-shaped and includes first and second extensions
transverse to each other, and the fan mechanism, the combustion
device, the vane mechanism, and the flame protector are disposed in
the first section of the shell.
14. The hot air blower as claimed in claim 13, wherein the fuel
canister is joined to the second section of and disposed outside
the shell.
15. The hot air blower as claimed in claim 13, wherein the fuel
canister is joined to the second section of and received in the
shell.
16. The hot air blower as claimed in claim 3, wherein the internal
and external flow tubes form a plurality of gaps between junctions
therebetween.
17. The hot air blower as claimed in claim 2, wherein the flame
protector includes a tamer disposed therein, and the flame
protector defines an open end and an air exit end, and the tamer is
in the form of a tube and includes a plurality of meshes.
18. The hot air blower as claimed in claim 1, wherein the flame
protector defines an open end and an air exit end including a
plurality of meshes.
19. The hot air blower as claimed in claim 18 further comprising an
internal flow tube disposed within the shell, wherein the internal
flow tube includes a periphery delimiting a cavity, and the
combustion device and the vane mechanism are disposed in the cavity
of the internal flow tube, and the external flow tube includes a
first end fixed to the internal flow tube and a second end extended
out of the shell.
20. The hot air blower as claimed in claim 1 further comprising an
internal flow tube disposed within the shell, wherein the internal
flow tube includes a periphery delimiting a cavity, and the
combustion device and the vane mechanism are disposed in the cavity
of the internal flow tube, and the external flow tube includes a
first end fixed to the internal flow tube and a second end extended
out of the shell.
Description
CROSS REFERENCE
[0001] The present application is a continuation-in-part
application of U.S. patent application Ser. No. 13/629,729, filed
on Sep. 28, 2012, of which the entire disclosure is incorporated
herein.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a hot air blower and,
particularly to, a hot air blower improved to blow air in a more
focused and less spread manner and to allow a user to effectively
control the extent of airflow.
[0004] 2. Description of the Related Art
[0005] U.S. Pat. No. 7,065,899 discloses a gas hot air gun
including a main body, an air blower, an ignition device, a nozzle
and a switch set. The main body includes a barrel, a handle, a
heating chamber and a mixing chamber on the inner front of the
barrel. A battery set and a gas can are inside the handle. One end
of the nozzle is connected to the gas can. The switch set includes
a power switch and an ignition switch. Users press the power switch
and have gas spray out from the nozzle into the heating chamber to
generate heat. The blower sends out hot air in the heating chamber
out of the main body. A metal slice to regulate the direction of
air and a catalyst to avoid flames from coming out of the nozzle
area are inside the heating chamber.
[0006] Applicant finds his patented gas hot air gun can be further
improved to have better controls of gas flow rates and heating
temperatures. It is acknowledged that there may be situations in
which a high gas flow rate inhibits a flame from being ignited, and
when the gas flow rate and oxygen supply rate are increased in
order to achieve a higher heating temperature, the increased supply
of oxygen proportionally causes air to travel at a higher speed as
the gas hot air gun includes an air passage with a fixed cross
sectional area. However, air can blow out a flame when the burning
speed of oxygen is slower or the density of gas is low.
[0007] The present invention is, therefore, intended to obviate or
at least alleviate the problems encountered in the prior art.
SUMMARY OF THE INVENTION
[0008] According to the present invention, a hot air blower
includes a shell, and a fuel canister, a fan mechanism, a
combustion device, a vane mechanism, and a flame protector are
disposed within the shell. The fan mechanism blows air. The
combustion device includes a burning end for giving out heat of
combustion. The vane mechanism is disposed in a position making the
combustion device locate between the fan mechanism and the vane
mechanism. The vane mechanism includes a clipping seat and a
plurality of guiding vanes. Each of the plurality of guiding vanes
extend obliquely on the clipping seat to prevent air passing
through the vane mechanism from generating turbulence and to
achieve a flow-regulating effect. The clipping seat and the
plurality of guiding vanes are formed as a one-piece structure. The
flame protector is disposed in the vane mechanism and hoods the
burning end of the combustion device. The air passing the vane
mechanism is able to be expelled out of the flame protector. The
clipping seat and the flame protector form a half-closed combustion
chamber therebetween. Heat in the half-closed combustion chamber
causes a thermal expansion of the air and thereby increasing a
speed and a volume of the air passing the guiding vanes of the vane
mechanism. An external flow tube is fixed in and extended out of
the shell. Heated air discharged out of the hot air blower from the
external flow tube and which controls a heating range of an area of
the hot air blower.
[0009] There has thus been outlined, rather broadly, the more
important features of the invention in order that the detailed
description thereof that follows may be better understood, and in
order that the present contribution to the art may be better
appreciated. There are additional features of the invention that
will be described hereinafter and which will form the subject
matter of the claims appended hereto.
[0010] In this respect, before explaining at least one embodiment
of the invention in detail, it is to be understood that the
invention is not limited in its application to the details of
construction and to the arrangements of the components set forth in
the following description or illustrated in the drawings. The
invention is capable of other embodiments and of being practiced
and carried out in various ways. Also, it is to be understood that
the phraseology and terminology employed herein are for the purpose
of description and should not be regarded as limiting.
[0011] As such, those skilled in the art will appreciate that the
conception, upon which this disclosure is based, may readily be
utilized as a basis for the designing of other structures, methods
and systems for carrying out the several purposes of the present
invention. It is important, therefore, that the claims be regarded
as including such equivalent constructions insofar as they do not
depart from the spirit and scope of the present invention.
[0012] Further, the purpose of the foregoing abstract is to enable
the U.S. Patent and Trademark Office and the public generally, and
especially the scientists, engineers and practitioners in the art
who are not familiar with patent or legal terms or phraseology, to
determine quickly from a cursory inspection the nature and essence
of the technical disclosure of the application. The abstract is
neither intended to define the invention of the application, which
is measured by the claims, nor is it intended to be limiting as to
the scope of the invention in any way.
[0013] Other objects, advantages, and new features of the present
invention will become apparent from the following detailed
description of the invention when considered in conjunction with
the accompanied drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a perspective view of a hot air blower in
accordance with a first embodiment of the present invention.
[0015] FIG. 2 is an exploded perspective view of the hot air blower
of FIG. 1.
[0016] FIG. 3 is a partial, exploded perspective view of the hot
air blower of FIG. 1.
[0017] FIG. 4 is a cross-sectional view of the hot air blower of
FIG. 1.
[0018] FIG. 5 is another cross-sectional view of the hot air blower
of FIG. 1.
[0019] FIG. 6 is a cross-sectional view showing the hot air blower
of FIG. 1 in operation.
[0020] FIG. 7 is another cross-sectional view showing the hot air
blower of FIG. 1 in operation.
[0021] FIG. 8 is a cutout view showing the hot air blower of FIG. 1
in operation.
[0022] FIG. 9 is a perspective view of a hot air blower in
accordance with a second embodiment of the present invention.
[0023] FIG. 10 is an exploded perspective view of the hot air
blower of FIG. 9.
[0024] FIG. 11 is a partial, exploded perspective view of the hot
air blower of FIG. 9.
[0025] FIG. 12 is a perspective view showing the hot air blower of
FIG. 9 and a fuel canister engagable therewith.
[0026] FIG. 13 is a continued perspective view of FIG. 12 and shows
the hot air blower in engagement with the fuel canister.
[0027] FIG. 14 is a cross-sectional view showing the hot air blower
of FIG. 9 in operation.
[0028] FIG. 15 is a cutout view showing the hot air blower of FIG.
9 in operation.
[0029] FIG. 16 is a perspective view of a hot air blower in
accordance with a third embodiment of the present invention.
[0030] FIG. 17 is an exploded perspective view of the hot air
blower of FIG. 16.
[0031] FIG. 18 is another exploded perspective view of the hot air
blower of FIG. 16.
[0032] FIG. 19 is a cross-sectional view showing the hot air blower
of FIG. 16 in operation.
DETAILED DESCRIPTION OF THE INVENTION
[0033] FIGS. 1 through 8 show a hot air blower in accordance with a
first embodiment of the present invention. The hot air blower
includes a shell 10, a fuel canisterister 20, a fan mechanism 30, a
combustion device 40, a vane mechanism 50, a flame protector 60, a
internal flow tube 70, and an external flow tube 80. The shell 10
includes first and second outer shells 11 and 12 symmetrically
joined to each other. The first and second shells 11 and 12 include
first and second clamping collars 13 and 14 disposed therein. The
shell 10 is substantially T-shaped including first and second
extensions 101 and 102 transverse to each other. The fan mechanism
30, the combustion device 40, the vane mechanism 50, and the flame
protector 60 are disposed in the first section 101 of the shell 10.
The fuel canister 20 is disposed in the second section 102 of the
shell 10.
[0034] The fuel canister 20, the fan mechanism 30, the combustion
device 40, the vane mechanism 50, and the flame protector 60 are
disposed within the shell 10.
[0035] The fan mechanism 30 blows air. The fan mechanism 30
includes a fan 31, a flow-regulating sleeve 32, a fan motor 33, and
a shielding cover 34. The flow-regulating sleeve 32 includes a
first end encasing the fan 31. The flow-regulating sleeve 32
includes a hole extended therethrough, and the fan 31 is disposed
in the hole and at the first end and of the flow-regulating sleeve
32. The fan 31 is completely disposed within the hole of the
flow-regulating sleeve 32, but not regarded as limiting. The
flow-regulating sleeve 32 includes a second end covering the fan
motor 33. The fan motor 33 is disposed in the hole of the
flow-regulating sleeve 32. The fan motor 33 is not completely
disposed within the hole of the flow-regulating sleeve 32, but not
regarded as limiting. The fan 31 is connected with and driven by
the fan motor 33. The shielding cover 34 includes an end attached
to the flow-regulating sleeve 32. The fan motor 33 includes a motor
spindle 331 the fan 31 is connected thereto. The fan 31 is rotated
upon rotation of the motor spindle 331. The shielding cover 34 is
attached to the second end of the flow-regulating sleeve 32. The
flow-regulating sleeve 32 and the shielding cover 34 are in a
tandem arrangement. The flow-regulating sleeve 32 includes an
annular internal wall 321, an annular external wall 322, and a
plurality of fins 323 extending between the internal and external
walls 321 and 322. The plurality of fins 323 extends obliquely on
the internal wall 321 and radially from the internal wall 321 to
the external wall 322. The internal wall 321 delimits a bore 324.
The bore 324 includes the fan motor 33 tightly fitted therein.
[0036] Combustions is carried out in the combustion device 40. A
catalyst net 41 can tame and prevent a flame from extending out of
the combustion device 40. The combustion device 40 includes an end
connecting with a first fuel line 42 and another end defining a
burning end 43. The burning end 43 gives out heat of combustion.
The combustion device 40 is mounted on the vane mechanism 50.
[0037] The vane mechanism 50 includes a first clipping seat 51 a
flow-regulating net 52, a second clipping seat 53, a plurality of
guiding vanes 54, and a heating tube 55. The first clipping seat 51
includes a bottom side 511, and a first through hole 513 is
extended through the bottom side 511. The first through hole 513 is
disposed in a central position of the first clipping seat 51. The
combustion device 40 is insertably disposed through the first
through hole 513. A plurality of guide holes 514 are disposed
circumferentially around the first through hole 513. An ignition
wire 516 is connected with an ignition device 517 disposed on the
first clipping seat 51. The ignition device 517 is able to produce
a flame. The flow-regulating net 52 is received within the first
clipping seat 51. The flow-regulating net 52 includes a plurality
of meshes 521. The flow-regulating net 52 includes a second through
hole 522. The second through hole 522 corresponds to the first
through hole 513. The combustion device 40 is insertably disposed
through the first and second through holes 513 and 522. The
flow-regulating net 52 is made of metal. The second clipping seat
53 is formed separately from the first clipping seat 51. One of the
first and second clipping seats 51 and 53 includes a first lateral
side 512 extended annularly and along a circumference of the bottom
side 511 and including a plurality of protruded first clamping
sections 515. The other of the first and second clipping seats 51
and 53 includes a second lateral side 531 extended annularly and
including a plurality of recessed second clamping sections 532, as
well as defining an embedding wall 533. The first and second
clipping seats 51 and 53 are connected together with the plurality
of protruded first clamping sections 515 correspondingly engaged
with the plurality of recessed second clamping sections 532. The
first and second clipping seats 51 and 53 are engaged together and
hold the plurality of guiding vanes 54. Each of the plurality of
guiding vanes 54 includes a recessed hook section 541 and an
anti-disengagement protruded hook section 542 on the same side and
adjacent to each other. The recessed hook section 541 of each of
the plurality of guiding vanes 54 is hooked onto the embedding wall
533. The anti-disengagement protruded hook sections 542 of each of
the plurality of guiding vane 54 is engaged and being clamped
between one of the plurality of protruded first clamping sections
515 and one of the plurality of recessed second clamping sections
532, thereby preventing disengagement from the first and second
clipping seats 51 and 53. Each of the plurality of guiding vanes 54
also includes a recessed limiting section 543. The recessed
limiting section 543, the recessed hook section 541, and the
anti-disengagement protruded hook section 542 are on the same side
and adjacent to one another. The heating tube 55 mounted on and
disposed in the first clipping seat 51. The heating tube 55 is
U-shaped. The heating tube 55 includes an end defining a fixing end
551. The heating tube 55 is insertably disposed through and
includes the fixing end 551 fixed in one of the plurality of guide
holes 514. The heating tube 55 includes two legs extended
separately, with one leg connecting with the first fuel line 42 and
the other leg connecting with a second fuel line 552, respectively.
The heating tube 55 is disposed in front of the fan mechanism 30
and aside of the combustion device 40. The combustion device 40 is
able to give off heat energy to the heating tube 55 and prevents
fuel condensed and clogged therein. Therefore, the heating tube 55
has a better combustion efficiently. The shielding cover 34
includes a lateral side extended annularly and delimiting a cavity
and including a cutout 341 penetrating therethrough. The cutout 341
allows the ignition wire 516 and the second fuel line 552 to extend
therethrough.
[0038] The flame protector 60 is mounted on the vane mechanism 50
and hoods the burning end 43 of the combustion device 40. The flame
protector 60 is axially disposed with respect to the vane mechanism
50. The flame protector 60 includes a side extended annularly and
delimiting a cavity, and has an end defining an open end 61 and
another end defining an air exit end 62. The exit end 62 has a wall
and an orifice extended through the wall. The burning end 43 of the
combustion device 40 is hooded in the cavity and disposed adjacent
to the open end 61 of the flame protector 60. The open end 61 of
the flame protector 60 is fixed to the second clipping seat 53 of
the vane mechanism 50. The flame protector 60 has an end fixed to
the lateral side 531 of the second clipping seat 53. Therefore, the
flame protector 60 is mounted on the vane mechanism 50. In the
embodiment, the second clipping seat 53 and the flame protector 60
are fixed together by a fastener. Moreover, the second clipping
seat 53 is disposed between the first clipping seat 51 and the
flame protector 60. The flame protector 60 also includes the wall
including a plurality of vents 63 extended therethrough, and the
air passing the vane mechanism 50 flows out of the flame protector
60 through the plurality of vents 63. The plurality of vents 63
allow heat convection and tames the flame. Therefore, the flame
from the combustion device 40 is prevented from propagation through
the flame protector 60. The plurality of vents 63 are
circumferentially disposed on the flame protector 60 and are
parallel to one another. Moreover, the first and second clipping
seats 51 and 53 and the flame protector 60 form a half-closed
combustion chamber a therebetween.
[0039] The internal flow tube 70 is disposed within the shell 10.
The first and second clamping collars 13 and 14 cooperate together
to hold the internal flow tube 70 fixed inside the shell 10. The
internal flow tube 70 includes a periphery delimiting a cavity, and
the combustion device 40 and the vane mechanism 50 are disposed in
the cavity of the internal flow tube 70. The internal flow tube 70
is disposed between the fan mechanism 30 and the external flow tube
80. Additionally, the shielding cover 34 is disposed between the
flow-regulating sleeve 32 and the internal flow tube 70.
[0040] The external flow tube 80 controls a heating range of an
area of the hot air blower. The external flow tube 80 has one end
mounted in the shell 10 and another end extended out of the shell
10. The external flow tube 80 includes a first end 81 mounted on
the internal flow tube 70 and a second end 82 extended out of the
shell 10. Moreover, the external flow tube 80 includes a cavity
extended therethrough from the first end to the second end 81 and
82 thereof, and the flame protector 60 is extended in the cavity of
external flow tube 80.
[0041] Furthermore, the internal and external flow tubes 70 and 80
form a plurality of gaps b between junctions therebetween.
[0042] When the hot air blower is in operation, the air flows
through the plurality of guide holes 514 and is regulated by the
plurality of meshes 521 of the flow-regulating net 52. The
flow-regulating net 52 limits the amount of air passing the vane
mechanism 50 per unit time to achieve a flow-regulating effect.
Each of the plurality of guiding vanes 54 extends obliquely between
the first and second clipping seats 51 and 53. The plurality of
guiding vanes 54 are circumferentially arranged on the first and
second clipping seats 51 and 53. The plurality of guiding vanes 54
prevent the air passing through the vane mechanism 50 from
generating turbulence to achieve a flow-regulating effect. Heat in
the half-closed combustion chamber a would cause a thermal
expansion of the air, thereby increasing a speed and a volume of
the air passing the guiding vanes 54 of the vane mechanism 50. The
internal flow tube 70 keeps the air flowing therein. The heated air
would be discharged out of the hot air blower from the external
flow tube 80. The plurality of gaps b causes a venturi effect
allowing an increased amount of external air to flow therein.
Furthermore, the plurality of gaps b prevents impedance of
circulation of the air avoiding the flame being put off,
particularly when a user operates the hot air blower too close to
an object to be heated.
[0043] FIGS. 9 through 15 show a hot air blower in accordance with
a second embodiment of the present invention, and same numbers are
used to correlate similar components of the first embodiment, but
bearing a letter a. The second embodiment is modified from the
first embodiment such that the first and second embodiments
differentiate from each other in that a shell 10a does not enclose
a fuel canister 20a engaged therewith. The shell 10 includes a
second extension 102a to which the fuel canister 20a is joined.
Also, a fan mechanism 30a does not include the shielding cover 34.
In addition, the vane mechanism 50 includes the first and second
clipping seats 51 and 53, but a vane mechanism 50a includes a
clipping seat 56a, and the clipping seat 56a and a plurality of
guiding vane 54a are formed as a one-piece structure. Furthermore,
each of the plurality of vanes 54a extends obliquely, and the
plurality of guiding vanes 54a are circumferentially arranged on
the outer circumference of the clipping seat 56a. Therefore, since
the clipping seat 56a and the plurality of guiding vanes 54a are
formed as a one-piece structure, the vane mechanism 50a has a
better structure strength and longer life, and a user can install
the vane mechanism 50a more easily. Moreover, the hot air blower
includes a flame protector 60a and a tamer 64a disposed in the
flame protector 60a. The flame protector 60a defines an open end
61a and an air exit end 62a, and includes a plurality of vents 63a
circumferentially disposed and extended therethrough. The tamer 64a
is made of metal and includes a plurality of meshes. The tamer 64a
is in the form of a tube. The tamer 64a retards heat loss, thereby
enabling a combustion device 40a of the hot air blower to emit heat
stably and at a stable speed. The tamer 64a can also prevent the
flame from the combustion device 40a from spreading out of the
flame protector 60a. The clipping seats 56a and the flame protector
60a form a half-closed combustion chamber a therebetween. In
addition, the arrangements between the combustion device 40, the
vane mechanism 50, the flame protector 60, the internal flow tube
70, and the external flame tube 80 also apply to the second
embodiment. Furthermore, the shell 10a includes first and second
clamping collars 13a and 14a disposed therein holding an internal
tube 70a securely.
[0044] FIGS. 16 through 19 show a hot air blower in accordance with
a third embodiment of the present invention and same numbers are
used to correlate similar components of the first embodiment, but
bearing a letter b. The third embodiment is modified from the first
embodiment, and the first and third embodiments differentiate from
each other in that a fan mechanism 30b does not include the
shielding cover 34. Also, a vane mechanism 50b of the hot air
blower of the third embodiment includes a clipping seat 56b instead
of two clipping seats. The clipping seat 56b includes a plurality
of guiding vanes 54b, and the clipping seat 56b and a plurality of
guiding vane 54b are formed as a one-piece structure. Each of the
plurality of guiding vanes 54b extends obliquely, and the plurality
of guiding vanes 54b are circumferentially arranged on the outer
circumference of the clipping seat 56b. Therefore, since the
clipping seat 56b and the plurality of guiding vanes 54b are formed
as a one-piece structure, the vane mechanism 50b has a better
structure strength and longer life, and a user can also install the
vane mechanism 50a more easily. Moreover, the flame protector 60b
differentiates from the flame protector 60. The flame protector 60b
defines an open end 61b and an air exit end 62b including a
plurality of meshes. The plurality of meshes of the air exit end
62b of the flame protector 60b are made of metal. Further, a ring
(not numbered) is used to keep the flame protector 60b on the
clipping seat 56b stably. In addition, the hot air blower of the
third embodiment also includes a shell 10b enclosing a fuel
canister 20b engaged therewith. The fuel canister 20 is joined to a
second extension 102b of the shell 10b. A fan 31b is received in a
flow-regulating sleeve 32b. A combustion device 40 defines a
burning end 43b hooded by a flame protector 60b. An internal flow
tube 70 and an external flow tube 80 are in a tandem arrangement.
The arrangements between the combustion device 40, the vane
mechanism 50, the flame protector 60, the internal flow tube 70,
and the external flame tube 80 also apply to the third embodiment,
except that the hot air blower of the third embodiment includes a
heating tube 55b disposed outside the clipping seat 56b and
adjacent to the plurality of guiding vanes 54b.
[0045] In view of the foregoing, the flame protectors 60, 60a, and
60b are axially disposed with respect to the vane mechanisms 50,
50a, and 50b, respectively. The plurality of vents 63, 63a allows
the heated air in the half-closed combustion chamber a to flow
thereout. The combustion devices 40, 40a, and 40b and the vane
mechanism 50, 50a, and 50b are insertably disposed in the internal
flow tubes 70, 70a, and 70b, respectively. The external flow tubes
80, 80a, and 80b are extended out of the shell 10, 10a, and 10b,
respectively. The air can flow spirally, and cold and hot air can
be thoroughly mixed, and the heated air can be discharged out at a
predetermined angle in order to control a heating range of an area
of the hot air blower. The half-closed combustion chamber a would
be less affected by the speed of the flow outside, thereby
providing a greater heating range of an area. Furthermore, since
the vane mechanisms 50, 50a, and 50b can reduce backflow, thereby
enabling a stable flow field inside and outside of the half-closed
combustion chamber a and allowing the heated air to be spirally
discharged. Therefore, it would be easier for a user to control a
heating range of an area in this regard. Each of the plurality of
guiding vanes 54, 54a, and 54b is obliquely extended at an angle
determined from the rotation speed of the respective fan mechanisms
30, 30a, and 30b, thereby stabling a spiral flow field and reducing
backflow and turbulence and increasing air flow stability and
efficiency. The air flows at higher speed at a zone radially
outward of a center of the spiral flow field and at slower speed at
a zone towards the center. Furthermore, since the flame protectors
60, 60a, and 60b cover the respective combustion device 40, 40a,
and 40b, and the half-closed combustion chamber a is close to the
center of the spiral flow field where the air flows slower, supply
of oxygen and the speed of air can be stably controlled in an
internal area of the respective flame protectors 60, 60a, and 60b
when the hot air blower blows a greater amount of air and needs
greater combustion. Furthermore, since the plurality of guiding
vanes 54, 54a, and 54b are disposed away from the center of the
spiral flow field where the air flows faster, and conform to a
streamline curvature of the spiral flow field, drag can be
effectively reduced to the least and backflow can be effectively
reduced and cold and hot air can be mixed thoroughly.
[0046] While the specific embodiments have been illustrated and
described, numerous modifications come to mind without
significantly departing from the spirit of invention, and the scope
of invention is only limited by the scope of accompanying
claims.
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