U.S. patent application number 12/492638 was filed with the patent office on 2010-01-07 for heat-dissipating pipe module.
Invention is credited to Ming-Chang Lai.
Application Number | 20100000721 12/492638 |
Document ID | / |
Family ID | 41463456 |
Filed Date | 2010-01-07 |
United States Patent
Application |
20100000721 |
Kind Code |
A1 |
Lai; Ming-Chang |
January 7, 2010 |
HEAT-DISSIPATING PIPE MODULE
Abstract
A heat-dissipating pipe module includes a first pipe unit
including a first pipe member disposed at an elongate pipe-mounting
portion of a cabinet for housing electronic equipment. A first
connecting member engages threadably an end of the first pipe
member. At least one side opening is in fluid communication with
the first pipe member and is directed toward the electronic
equipment. A second pipe unit includes a second pipe member
disposed at the elongate pipe-mounting portion, a second connecting
member, and at least one side opening. A major portion of the
second pipe member has an inner diameter smaller than that of a
major portion of the first pipe member. The second connecting
member engages threadably the first connecting member and the
second pipe member.
Inventors: |
Lai; Ming-Chang; (Taipei
City, TW) |
Correspondence
Address: |
VEDDER PRICE P.C.
222 N. LASALLE STREET
CHICAGO
IL
60601
US
|
Family ID: |
41463456 |
Appl. No.: |
12/492638 |
Filed: |
June 26, 2009 |
Current U.S.
Class: |
165/104.34 ;
165/121; 165/146; 165/147 |
Current CPC
Class: |
H01L 2924/0002 20130101;
F28F 9/0263 20130101; H01L 23/467 20130101; H05K 7/20572 20130101;
H01L 2924/0002 20130101; F28F 9/0275 20130101; H05K 7/20145
20130101; H01L 2924/00 20130101 |
Class at
Publication: |
165/104.34 ;
165/146; 165/147; 165/121 |
International
Class: |
F28D 15/00 20060101
F28D015/00; F28F 13/08 20060101 F28F013/08; F28F 7/00 20060101
F28F007/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 2, 2008 |
TW |
097124867 |
Claims
1. A heat-dissipating pipe module adapted to be mounted in a
cabinet that includes a box body for housing electronic equipment
therein and at least one elongate pipe-mounting portion, said
heat-dissipating pipe module comprising: a first pipe unit
including a first pipe member adapted to be disposed at the
elongate pipe-mounting portion and adapted to be connected to a
driving source that drives airflow, a first connecting member
engaging threadably an end of said first pipe member distal from
the driving source, and at least one side opening in fluid
communication with said first pipe member and adapted to be
directed toward the electronic equipment; and a second pipe unit
including a second pipe member adapted to be disposed at the
elongate pipe-mounting portion, a second connecting member, and at
least one side opening in fluid communication with said second pipe
member and adapted to be directed toward the electronic equipment,
a major portion of said second pipe member having an inner diameter
smaller than that of a major portion of said first pipe member,
said second connecting member engaging threadably said first
connecting member and said second pipe member, said second pipe
member being communicated fluidly with said first pipe member.
2. The heat-dissipating pipe module as claimed in claim 1, wherein
said end of said first pipe member distal from the driving source
is an internally threaded end, and said second pipe member has two
opposite internally threaded ends, said first connecting member
being tubular and having an externally threaded portion engaging
said internally threaded end of said first pipe member, said second
connecting member being tubular and having an internally threaded
portion and an externally threaded portion engaging said internally
threaded portion of said first connecting member and said
internally threaded end of said second pipe member.
3. The heat-dissipating pipe module as claimed in claim 2, further
comprising a third pipe unit adapted to be disposed at the elongate
pipe-mounting portion, said second pipe unit further including a
third connecting member, said third pipe unit including: a third
pipe member aligned with and adjacent to said second pipe member,
having two opposite internally threaded ends, and being
communicated fluidly with said second pipe member; a tubular fourth
connecting member having an externally threaded portion engaging
one of said internally threaded ends of said third pipe member
proximate to said second pipe member; and a side opening in fluid
communication with said third pipe member and adapted to be
directed toward the electronic equipment, a major portion of said
third pipe member having an inner diameter smaller than that of
said second pipe member, said third connecting member engaging
threadably said externally threaded portion of said fourth
connecting member and one of said internally threaded ends of said
second pipe member that is distal from said first pipe member, said
second pipe member being communicated fluidly with said third pipe
member.
4. The heat-dissipating pipe module as claimed in claim 3, wherein
said third pipe unit further includes a closure member, said
closure member engaging threadably and sealing one of said
internally threaded ends of said third pipe member that is distal
from said second pipe member.
5. The heat-dissipating pipe module as claimed in claim 4, wherein
each of said first, second, and third pipe members includes: two
side pipes; a middle pipe disposed between and aligned with said
side pipes and having two ends, said middle pipe cooperating with
said side pipes to constitute the major portion of a corresponding
of said first, second, and third pipe members; two said side
openings formed respectively in said side pipes; and two tubular
connectors each extending into and engaging threadably a respective
one of said ends of said middle pipe and a respective one of said
side pipes.
6. The heat-dissipating pipe module as claimed in claim 4, wherein
each of said first, second, and third pipe members includes: two
side pipes constituting the major portion of a corresponding of
said first, second, and third pipe members; a middle pipe disposed
between and aligned with said side pipes and having two ends
engaging respectively and threadably said side pipes; and a fan
unit disposed in said middle pipe.
7. The heat-dissipating pipe module as claimed in claim 1, wherein
said first pipe member includes: a first pipe; a first-T-joint
having a longitudinal tube portion aligned with and adjacent to
said first pipe, and a transverse tube portion extending
perpendicularly from an intermediate portion of said longitudinal
tube portion, said longitudinal tube portion having a proximate end
proximate to said first pipe, and a distal end distal from said
first pipe and constituting said end of said first pipe member
distal from the driving source; and a tubular connector extending
into and engaging threadably said proximate end of said
longitudinal tube portion of said first T-joint and said first
pipe.
8. The heat-dissipating pipe module as claimed in claim 7, wherein
said first pipe member further includes a first extension pipe
aligned with and communicated fluidly with said transverse tube
portion of said first T-joint, said first extension pipe
cooperating with said first pipe and said first T-joint to
constitute the major portion of said first pipe member, said first
extension pipe having one end portion engaging threadably an end of
said transverse tube portion of said first T-joint, and the other
end portion formed with an air outlet that is adapted to be
disposed in proximity to the electronic equipment.
9. The heat-dissipating pipe module as claimed in claim 8, wherein
said second pipe member includes: a second pipe aligned with and
adjacent to said longitudinal tube portion of said first T-joint, a
second T-joint having a longitudinal tube portion aligned with said
second pipe, and a transverse tube portion extending
perpendicularly from an intermediate portion of said longitudinal
tube portion of said second T-joint, said longitudinal tube portion
of said second T-joint having a proximate end proximate to said
second pipe, and a distal end distal from said second pipe, and a
tubular connector extending into and engaging threadably said
proximate end of said longitudinal tube portion of said second
T-joint and said second pipe, and said second pipe unit further
includes a third connecting member extending into and engaging
threadably said distal end of said longitudinal tube portion of
said second T-joint.
10. The heat-dissipating pipe module as claimed in claim 9, wherein
said second pipe member further includes a second extension pipe
aligned with and communicated fluidly with said transverse tube
portion of said second T-joint, said second extension pipe
cooperating with said second pipe and said second T-joint to
constitute the major portion of said second pipe member, said
second extension pipe having one end portion engaging threadably an
end of said transverse tube portion of said second T-joint, and the
other end portion formed with an air outlet that is adapted to be
disposed in proximity to the electronic equipment.
11. The heat-dissipating pipe module as claimed in claim 9, further
comprising a third pipe unit adapted to be disposed at the elongate
pipe-mounting portion, said third pipe unit including a third pipe
member and a fourth connecting member, a major portion of said
third pipe member having an inner diameter smaller than that of the
major portion of said second pipe member, said third pipe member
including: a third pipe aligned with and adjacent to said
longitudinal tube portion of said second T-joint, said fourth
connecting member extending into and engaging threadably said third
connecting member and said third pipe; a third T-joint having a
longitudinal tube portion aligned with said third pipe, and a
transverse tube portion extending perpendicularly from an
intermediate portion of said longitudinal tube portion of said
third T-joint, said longitudinal tube portion of said third T-joint
having a proximate end proximate to said third pipe, and a distal
end distal from said third pipe; and a tubular connector extending
into and engaging threadably said proximate end of said
longitudinal tube portion of said third T-joint and said third
pipe.
12. The heat-dissipating pipe module as claimed in claim 11,
wherein said third pipe member further includes a third extension
pipe aligned with and communicated fluidly with said transverse
tube portion of said third T-joint, said third extension pipe
cooperating with said third pipe and said third T-joint to
constitute the major portion of said third pipe member, said third
extension pipe having one end portion engaging threadably an end of
said transverse tube portion of said third T-joint, and the other
end portion formed with at least one air outlet that is adapted to
be disposed in proximity to the electronic equipment.
13. The heat-dissipating pipe module as claimed in claim 12,
wherein said third pipe unit further includes a closure member,
said closure member engaging threadably and sealing said distal end
of said longitudinal tube portion of said third T-joint.
14. The heat-dissipating pipe module as claimed in claim 12,
wherein said first pipe member further includes: a side pipe
aligned with and adjacent to said first pipe; a middle pipe
disposed between and aligned with said side pipe and said first
pipe and having two ends engaging respectively and threadably said
side pipe and said first pipe; and a fan unit disposed in said
middle pipe.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority of Taiwanese application
no. 097124867, filed on Jul. 2, 2008.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a heat-dissipating pipe module,
more particularly to a heat-dissipating pipe module adapted to be
mounted in a cabinet for housing electronic equipment therein.
[0004] 2. Description of the Related Art
[0005] Heat is generated by electronic equipment during operation.
Therefore, it is necessary to dissipate heat from the electronic
equipment.
[0006] Referring to FIG. 1, a conventional heat-dissipating pipe
module 8 is adapted to be mounted in a cabinet 9 that includes a
box body 91 for housing superposed electronic equipment 90 therein,
and four elongate pipe-mounting portions 92 disposed respectively
at four corners of the cabinet 9. Air outside of the cabinet 9 is
introduced into the box body 91 by the heat-dissipating pipe module
8, mixes with high temperature air inside the box body 91, and then
is discharged out of the box body 91 through a vent hole (not
shown) disposed at the box body 91 or a venting device (not shown).
The heat-dissipating pipe module 8 comprises a plurality of pipe
members 81 mounted at one of the pipe-mounting portions 92 that
have the same inner diameter, and a closure member 82. The pipe
members 81 are mounted in succession along a vertical direction.
Each of the pipe members 81 includes a side opening facing toward
the electronic equipment 90. The closure member 82 engages
threadably and seals one end of the lowermost pipe member 81.
[0007] By use of a fan (not shown), air flows into the pipe members
81, and toward the electronic equipment 90 through the side
openings 811 of the pipe members 81. Thus, the electronic equipment
90 can be cooled.
[0008] However, since the pipe members 81 have the same inner
diameter, flow rate of the air in the pipe members 81 decreases
gradually from the uppermost pipe member 81 toward the lowermost
pipe member 81. As such, heat cannot be dissipated effectively from
the lowermost electronic equipment 90, thereby reducing the
operating efficiency of the lowermost electronic equipment 90.
SUMMARY OF THE INVENTION
[0009] Therefore, the object of the invention is to provide a
heat-dissipating pipe module capable of alleviating the above
drawback of the prior art.
[0010] Accordingly, a heat-dissipating pipe module of the present
invention is adapted to be mounted in a cabinet that includes a box
body for housing electronic equipment therein and at least one
elongate pipe-mounting portion. The pipe module includes a first
pipe unit including a first pipe member adapted to be disposed at
the elongate pipe-mounting portion and adapted to be connected to a
driving source that drives airflow. A first connecting member
engages threadably an end of the first pipe member distal from the
driving source. At least one side opening is in fluid communication
with the first pipe member and is adapted to be directed toward the
electronic equipment. A second pipe unit includes a second pipe
member adapted to be disposed at the elongate pipe-mounting
portion, a second connecting member, and at least one side opening
in fluid communication with the second pipe member and adapted to
be directed toward the electronic equipment. A major portion of the
second pipe member has an inner diameter smaller than that of a
major portion of the first pipe member. The second connecting
member engages threadably the first connecting member and the
second pipe member. The second pipe member is communicated fluidly
with the first pipe member.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Other features and advantages of the invention will become
apparent in the following detailed description of the preferred
embodiments with reference to the accompanying drawings, of
which:
[0012] FIG. 1 is a perspective view of a conventional
heat-dissipating pipe module adapted to be mounted in a cabinet for
housing electronic equipment therein;
[0013] FIG. 2 is a perspective view of a heat-dissipating pipe
module of the first preferred embodiment of the present invention,
illustrating the heat-dissipating pipe module mounted in a cabinet
for housing electronic equipment therein;
[0014] FIG. 3 is a sectional view of the heat-dissipating pipe
module of the first preferred embodiment of the present
invention;
[0015] FIG. 4 is a sectional view of a heat-dissipating pipe module
of a second preferred embodiment of the present invention;
[0016] FIG. 5 is a sectional view of a heat-dissipating pipe module
of a third preferred embodiment of the present invention;
[0017] FIG. 6 is a perspective view of a heat-dissipating pipe
module of a fourth preferred embodiment of the present invention,
illustrating the heat-dissipating pipe module mounted in a cabinet
for housing electronic equipment therein;
[0018] FIG. 7 is a sectional view of a heat-dissipating pipe module
of the fourth preferred embodiment of the present invention;
and
[0019] FIG. 8 is a sectional view of a heat-dissipating pipe module
of a fifth preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] Before the invention is described in greater detail with
reference to the accompanying embodiments, it should be noted
herein that like elements are denoted by the same reference
numerals throughout the disclosure.
[0021] Referring to FIGS. 2 and 3, a first preferred embodiment of
a heat-dissipating pipe module of the present invention adapted to
be mounted in a cabinet 1 is shown. The cabinet 1 includes a box
body 11 for housing superposed electronic equipment 2 therein and
four elongate pipe-mounting portions 12. The heat-dissipating pipe
module comprises a first pipe unit 3 including a first pipe member
31 adapted to be disposed at one of the elongate pipe-mounting
portions 12 (hereinafter referred to as the pipe-mounting portion)
and adapted to be connected to a driving source (not shown) that
drives airflow. A first connecting member 32 engages threadably an
end of the first pipe member 31 distal from the driving source. A
side opening 30 is formed in the first pipe member 31 and is
adapted to be directed toward the electronic equipment 2. The end
of the first pipe member 31 distal from the driving source is an
internally threaded end 311. The first connecting member 32 is
tubular and has an internally threaded portion 325, and an
externally threaded portion 326 engaging the internally threaded
end 311 of the first pipe member 31.
[0022] A second pipe unit 4 includes a second pipe member 41
adapted to be disposed at the elongate pipe-mounting portion 12, a
second connecting member 42, and two side openings 40 formed in the
second pipe member 41 and adapted to be directed toward the
electronic equipment 2. The second pipe member 41 has two opposite
internally threaded ends 411. The second connecting member 42 is
tubular and has an internally threaded portion 425 and an
externally threaded portion 426 engaging the internally threaded
portion 325 of the first connecting member 32 and the upper
internally threaded end 411 of the second pipe member 41. The
second pipe member 41 has an inner diameter smaller than that of
the first pipe member 31. The second pipe member 41 is communicated
fluidly with the first pipe member 31.
[0023] A third pipe unit 5 is adapted to be disposed at the
elongate pipe-mounting portion 12. The second pipe unit 4 further
includes a third connecting member 44. The third pipe unit 5
includes a third pipe member 51, a tubular fourth connecting member
52, a closure member 54, and two side openings 50 formed in the
third pipe member 51 and adapted to be directed toward the
electronic equipment 2. The third pipe member 51 is aligned with
and adjacent to the second pipe member 41, has two opposite
internally threaded ends 511, and is communicated fluidly with the
second pipe member 41. The closure member 54 engages threadably and
seals one of the internally threaded ends 511 of the third pipe
member 51 that is distal from the second pipe member 41. The
tubular fourth connecting member 52 has an externally threaded
portion 526 engaging one of the internally threaded ends 511 of the
third pipe member 51 proximate to the second pipe member 41. The
third pipe member 51 has an inner diameter smaller than that of the
second pipe member 41. The third connecting member 44 engages
threadably the externally threaded portion 526 of the fourth
connecting member 52 and one of the internally threaded ends 411 of
the second pipe member 41 that is distal from the first pipe member
31. The second pipe member 41 is communicated fluidly with the
third pipe member 51.
[0024] The driving source drives airflow into the heat-dissipating
pipe module mounted in the cabinet 1. Air flows from the first,
second, and third pipe units 3, 4, 5, and then is directed toward
the electronic equipment 2 through the side openings 30, 40, 50. An
exhaust fan module (not shown) is provided to force air out of the
cabinet 1 after heat exchange, such that heat convection is also
conducted to further cool the electronic equipment 2. Due to the
differences among the inner diameters of the first, second, and
third pipe members 31, 41, 51, the flow rate of the air in the
second pipe member 41 is not slower than that of the first pipe
member 31, and the flow rate of the air in the third pipe member 51
is not slower than that of the second pipe member 41. Therefore,
heat exchange efficiency of the present invention is better than
that of the prior art.
[0025] It should be noted that the combination of the first,
second, and third pipe members 31, 41, 51 is not limited to the
first preferred embodiment. The number of the first, second, and
third pipe members 31, 41, 51 may be changed according to the
amount of heat generated by the electronic equipment 20, such that
the flow rate of the air can meet heat-dissipating requirements.
For example, the second pipe member 41 and the third connecting
member 44 are omitted, and the fourth connecting member 52 engages
the second connecting member 42 and the third pipe member 51.
Moreover, the closure member 54 may be replaced by any component
that can seal one of the internally threaded ends 511 of the third
pipe member 51 distal from the second pipe member 41.
[0026] As shown in FIG. 4, a second preferred embodiment of the
heat-dissipating pipe module according to the present invention has
a structure similar to that of the first embodiment. The main
difference between this embodiment and the first embodiment resides
in the following. Each of the first, second, and third pipe members
31, 41, 51 includes two side pipes 312, 412, 512, and a middle pipe
313, 413, 513 disposed between and aligned with the side pipes 312,
412, 512 and cooperating with the side pipes 312, 412, 512 to
constitute a major portion of a corresponding of the first, second,
and third pipe members 31, 41, 51. Two side openings 30, 40, 50 are
formed respectively in the side pipes 312, 412, 512 of each of the
first, second, and third pipe members 31, 41, 51. Each end of each
of the middle pipes 313, 413, 513 is connected to the corresponding
side pipe 312, 412, 512 by a tubular connector 314, 414, 514. The
second preferred embodiment has the same advantages as those of the
first preferred embodiment.
[0027] As shown in FIG. 5, a third preferred embodiment of the
heat-dissipating pipe module according to the present invention has
a structure similar to that of the second embodiment. The main
difference between this embodiment and the second embodiment
resides in the following. Each of the first, second, and third pipe
members 31, 41, 51 includes two side pipes 312, 412, 512
constituting the major portion of a corresponding of the first,
second, and third pipe members 31, 41, 51, and a middle pipe 313,
413, 513 disposed between and aligned with the side pipes 312, 412,
512 and having two ends engaging respectively and threadably the
side pipes 312, 412, 512. Three fan units 7, 71, 72 are disposed
respectively in the middle pipes 313, 413, 513. The third preferred
embodiment has the same advantages as those of the first preferred
embodiment.
[0028] It should be noted that the number of the fan units, the
side pipes, and the middle pipes may be modified in other
embodiments of this invention.
[0029] As shown in FIGS. 6 and 7, a fourth preferred embodiment of
the heat-dissipating pipe module according to the present invention
has a structure similar to that of the first embodiment. The main
difference between this embodiment and the first embodiment resides
in the following. The first pipe member 31 includes a first pipe
310, and a first T-joint 315. The first T-joint 315 has a
longitudinal tube portion 315a aligned with and adjacent to the
first pipe 310, and a transverse tube portion 315b extending
perpendicularly from an intermediate portion of the longitudinal
tube portion 315a. The longitudinal tube portion 315a has a
proximate end proximate to the first pipe 310, and a distal end
distal from the first pipe 310. A tubular connector 316 extends
into and engages threadably the proximate end of the longitudinal
tube portion 315a of the first T-joint 315 and the first pipe 310.
The first pipe member 31 further includes a first extension pipe 33
aligned with and communicated fluidly with the transverse tube
portion 315b of the first T-joint 315. The first extension pipe 33
cooperates with the first pipe 310 and the first T-joint 315 to
constitute the major portion of the first pipe member 31. The first
extension pipe 33 has one end portion engaging threadably an end of
the transverse tube portion 315b of the first T-joint 315, and the
other end portion formed with an air outlet 331 that is adapted to
be disposed in proximity to the electronic equipment 2.
[0030] The second pipe member 41 includes a second pipe 410 aligned
with and adjacent to the longitudinal tube portion 315a of the
first T-joint 315, and a second T-joint 415. The second T-joint 415
has a longitudinal tube portion 415a aligned with the second pipe
410, and a transverse tube portion 415b extending perpendicularly
from an intermediate portion of the longitudinal tube portion 415a
of the second T-joint 415. The longitudinal tube portion 415a of
the second T-joint 415 has a proximate end proximate to the second
pipe 410, and a distal end distal from the second pipe 410. A
tubular connector 416 extends into and engages threadably the
proximate end of the longitudinal tube portion 415a of the second
T-joint 415 and the second pipe 410. The second pipe unit 4 further
includes a third connecting member 44 extending into and engaging
threadably the distal end of the longitudinal tube portion 415a of
the second T-joint 415. The second pipe member 41 further includes
a second extension pipe 43 aligned with and communicated fluidly
with the transverse tube portion 415b of the second T-joint 415.
The second extension pipe 43 cooperates with the second pipe 410
and the second T-joint 415 to constitute the major portion of the
second pipe member 41. The second extension pipe 43 has one end
portion engaging threadably an end of the transverse tube portion
415b of the second T-joint 415, and the other end portion formed
with an air outlet 431 that is adapted to be disposed in proximity
to the electronic equipment 2. A major portion of the third pipe
member 51 has an inner diameter smaller than that of the major
portion of the second pipe member 41. The third pipe member 51
includes a third pipe 510 aligned with and adjacent to the
longitudinal tube portion 415a of the second T-joint 415, and a
third T-joint 515. The third T-joint 515 has a longitudinal tube
portion 515a aligned with the third pipe 510, and a transverse tube
portion 515b extending perpendicularly from an intermediate portion
of the longitudinal tube portion 515a of the third T-joint 515. The
longitudinal tube portion 515a of the third T-joint 515 has a
proximate end proximate to the third pipe 510, and a distal end
distal from the third pipe 510. A tubular connector 516 extends
into and engages threadably the proximate end of the longitudinal
tube portion 515a of the third T-joint 515 and the third pipe 510.
The third pipe member 51 further includes a third extension pipe 53
aligned with and communicated fluidly with the transverse tube
portion 515b of the third T-joint 515. The third extension pipe 53
cooperates with the third pipe 510 and the third T-joint 515 to
constitute the major portion of the third pipe member 51. The third
extension pipe 53 has one end portion engaging threadably an end of
the transverse tube portion 515b of the third T-joint 515, and the
other end portion formed with two air outlets 531 that are adapted
to be disposed in proximity to the electronic equipment 2. The
third pipe unit 5 further includes a closure member 54 engaging
threadably and sealing the distal end of the longitudinal tube
portion 515a of the third T-joint 515. The fourth preferred
embodiment has the same advantages as those of the first preferred
embodiment.
[0031] The first, second, and third extension pipes 33, 43, 53 are
in fluid communication with the first, second, and third pipe
members 31, 41, 51, and are adapted to guide the air toward the
electronic equipment 2. It should be noted that the first, second,
and third T-joints 315, 415, 515 may be formed integrally with a
corresponding one of the first, second, and third pipe members 31,
41, 51 in other embodiments of this invention.
[0032] As shown in FIG. 8, a fifth preferred embodiment of the
heat-dissipating pipe module according to the present invention has
a structure similar to that of the fourth embodiment. The main
difference between this embodiment and the fourth embodiment
resides in the following. The first pipe member 31 further includes
a side pipe 312 aligned with and adjacent to the first pipe 310. A
middle pipe 313 is disposed between and aligned with the side pipe
312 and the first pipe 310 and has two ends engaging respectively
and threadably the side pipe 312 and the first pipe 310. A fan unit
7 is disposed in the middle pipe 313. The fifth preferred
embodiment has the same advantages as those of the fourth preferred
embodiment.
[0033] While the invention has been described in connection with
what are considered the most practical and embodiments, it is
understood that this invention is not limited to the disclosed
embodiments but is intended to cover various arrangements included
within the spirit and scope of the broadest interpretation so as to
encompass all such modifications and equivalent arrangements.
* * * * *