U.S. patent number 3,826,607 [Application Number 05/382,866] was granted by the patent office on 1974-07-30 for combustion chamber for dryer.
This patent grant is currently assigned to The Maytag Company. Invention is credited to L. Dean Kuhn.
United States Patent |
3,826,607 |
Kuhn |
July 30, 1974 |
COMBUSTION CHAMBER FOR DRYER
Abstract
A clothes dryer includes a fuel combustion chamber comprising a
pair of telescoped housing portions defining a generally annular
secondary air intake intermediate the opposite ends of the
combustion chamber formed by the housing portions. The annular
secondary air intake formed by the telescoped housing portions
permits more complete combustion of the fuel while achieving a
decreased surface temperature of the combustion chamber wall.
Inventors: |
Kuhn; L. Dean (Newton, IA) |
Assignee: |
The Maytag Company (Newton,
IA)
|
Family
ID: |
23510720 |
Appl.
No.: |
05/382,866 |
Filed: |
July 26, 1973 |
Current U.S.
Class: |
432/105; 431/351;
432/114; 34/595 |
Current CPC
Class: |
F23D
91/02 (20150701); D06F 58/263 (20130101); F26B
21/001 (20130101); F23D 2206/0094 (20130101) |
Current International
Class: |
F23D
21/00 (20060101); D06F 58/26 (20060101); F26B
21/00 (20060101); D06F 58/20 (20060101); F23r
001/10 (); F26b 011/02 () |
Field of
Search: |
;34/79,82,133,48
;431/351,352
;432/115,105,49,88,92,103,104,105,106,117,114,219,222 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Camby; John J.
Assistant Examiner: Yuen; Henry C.
Attorney, Agent or Firm: Landwier; William G. Ward; Richard
L.
Claims
I claim:
1. In a clothes dryer having a drying chamber, the combination
comprising: a fuel burner supported within said clothes dryer; a
combustion chamber including a first housing portion and a second
housing portion, said first housing portion being generally conical
and open at the enlarged end to receive the egress of said burner
and to define a first air intake into said combustion chamber at
said enlarged end, said second housing portion having a first end
telescopically adjacent to and spaced radially outwardly from the
reduced end of said first housing portion; means for connecting
said first and second housing portions together including legs
formed integrally with said second housing portion at said first
end thereof and extending inwardly and attached to the reduced end
of said first housing portion for cooperatively connecting the two
housing portions together to define said combustion chamber, the
connection between the first and second housing portions defining a
generally continuous annular second air intake into said combustion
chamber intermediate the ends thereof; and means for connecting
said combustion chamber in fluid communication with said drying
chamber.
2. In a clothes dryer as defined in claim 1 wherein said second
housing portion is generally cylindrical and receives the reduced
end of said first housing portion in a longitudinally overlapping
relationship.
3. In a clothes dryer as defined in claim 1 wherein said first and
second housing portions are concentric to a common axis.
4. In a clothes dryer as defined in claim 1 wherein said first and
second housing portions are each substantially imperforate whereby
air ingress into said combustion chamber is limited to said first
and second air intakes.
5. In a clothes dryer having a drying chamber, the combination
comprising: a fuel burner supported within said clothes dryer on an
axis inclined upwardly from a horizontal plane; a combustion
chamber having an inclined axis generally parallel to the axis of
said burner and including a first housing portion and a second
housing portion, said first housing portion being generally conical
and open at the enlarged end to receive the egress of said burner
and to define a first air intake into said combustion chamber, said
second housing portion being enlarged and including a thin wall
member generally open at a first end to receive the reduced end of
said first housing portion in a longitudinally overlapping radially
outwardly spaced relationship, said second housing portion having
at said first end a plurality of legs formed integrally with said
second housing portion and comprising a generally annular portion
of said thin wall member deformed radially inwardly at spaced
circumferential positions for engagement with said first housing
portion, said legs being attached to the reduced end of said first
housing portion for cooperatively connecting the two housing
portions together to define said combustion chamber, the connection
between the first and second housing portions defining a generally
continuous annular second air intake into said combustion chamber
intermediate the ends thereof; and means for connecting said
combustion chamber in fluid communication with said drying
chamber.
6. In a clothes dryer as defined in claim 5 wherein the axis of
said burner is spaced below the axis of said combustion
chamber.
7. In a clothes dryer as defined in claim 5 wherein said second
housing portion is cylindrical and wherein both housing portions
are concentric to the inclined axis of said combustion chamber.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to heating apparatus and more particularly
to a novel fuel combustion chamber for a clothes dryer.
2. Description of the Prior Art
Prior art shows a continuing search for improved fuel combustion
apparatus to achieve the utmost efficiency in combustion and
heating. U.S. Pat. No. 2,606,014 for example discloses a space
heater in which the combustion chamber comprises a conical housing
having spaced perforations near the enlarged egress end for
admitting secondary combustion air under the influence of a driven
fan. U.S. Pat. No. 2,852,241 on the other hand discloses a double
wall combustion chamber including a square collar at the reduced
end of a generally conical combustion chamber for admitting
secondary air into the fluid system. Still further U.S. Pat. No.
3,291,467 shows an elongated conical combustion chamber including
spaced perforations near the reduced end of the conical housing for
admitting secondary air and being sloped upwardly relatively to the
fuel burner.
SUMMARY OF THE INVENTION
It is an object of the instant invention to provide a fuel
combustion chamber for achieving improved airflow to effect more
complete combustion and greater heating efficiency.
It is a further object of the instant invention to provide a
combustion chamber comprising a pair of telescoped housing portions
defining a generally annular secondary air intake intermediate the
opposite ends of the combustion chamber.
It is a still further object of the instant invention to provide a
fuel burner combustion chamber having a pair of telescoping housing
portions connected by integral legs formed in one of the housings
to define a generally annular secondary air intake intermediate the
ends of the combustion chamber for achieving more complete
combustion and greater heating efficiency.
The instant invention achieves these objects in a clothes dryer
having a combustion chamber comprising a pair of housing portions
having an intermediate connecting relationship defining a generally
annular secondary air intake intermediate the ends of the
combustion chamber.
Operation of the device and further objects and advantages thereof
will become evident as the description proceeds and from an
examination of the accompanying two pages of drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings illustrate a preferred embodiment of the invention
with similar numerals referring to similar parts throughout the
several views wherein:
FIG. 1 shows an overall view of a clothes drying apparatus
partially broken away and sectioned to show a preferred embodiment
of the instant invention;
FIG. 2 is a fragmentary view of the heating apparatus of FIG. 1
including a longitudinal section of the combustion chamber; and
FIG. 3 shows a transverse section of the combustion chamber of FIG.
2 as taken along lines 3--3 of FIG. 2.
DESCRIPTION OF A PREFERRED EMBODIMENT
Referring to FIG. 1, there is shown the overall construction for a
clothes dryer 10 including a cabinet assembly comprising a sidewall
wrapper 11 having generally vertical opposite side panels 13 and a
rear panel 14. The sidewall wrapper 11 is supported on a base 15
which in turn is supported on a horizontal surface through a
plurality of vertically adjustable feet 16. The cabinet assembly
further comprises a front panel 19 and a top cover 20 supported on
the sidewall wrapper 11. The top cover 20 includes an upwardly
extending housing 21 for accommodating selected controls for the
dryer.
The front panel 19 includes a generally central access opening 23
and a door 24 hinged on the front panel 19 for operation between
open and closed positions relative to the access opening 23. The
door 24 comprises an outer panel 25 substantially flush with the
front panel and an inner panel 26 having a portion that extends
rearwardly into the access opening 23. A seal 29 supported by the
inner panel 26 extends endlessly around the rearwardly extending
portion of the inner panel 26 for engagement with a recess portion
30 of the front panel 19 to effectively provide an air seal at the
access opening 23.
Disposed within the cabinet assembly is a pair of spaced-apart
generally vertical bulkheads 31 and 33. The rear bulkhead 33 is
fixed to the sidewall wrapper 11 by a pair of brackets such as the
bracket 35 that includes a front flange connected to the bulkhead
33 and a rear flange connected at the rear panel 14 of the sidewall
wrapper 11. The front bulkhead 31 is similarly connected to the
front flanges of wrapper 11 with a pair of brackets (not
shown).
A generally cylindrical peripheral sidewall 36 having a generally
horizontal axis is disposed between the stationary bulkheads. At
the front and at the rear of the peripheral sidewall 36 there are
inwardly turned flanges comprising relatively short end walls 39
and 40 juxtaposed the front and rear bulkheads and cooperable with
the sidewall 36 to effectively define a fabric tumbler 41. A
plurality of baffle members 42 are fixed to the peripheral sidewall
36 and extend into the tumbling chamber to effect movement of
fabrics therewithin during rotation of the fabric tumbler 41.
The front and rear bulkheads 31 and 33 include radially outwardly
disposed recess portions 43 and 44 extending axially toward the
rear and toward the front, respectively, of the dryer. Seals 45 and
46 are fixed to the bulkheads 31 and 33 in the recesses 43 and 44
and are engageable with the tumbler end walls 39 and 40 to provide
an air seal at the ends of the tumbler 41. The seal member 46, for
example, is a U-shaped or channel-shaped felt member having a pair
of generally outwardly extending legs connected by an intermediate
arcuate portion. One leg, of seal 46 for example, is fixed as with
adhesive in the recess 44 of the stationary bulkhead 33 so that the
intermediate arcuate portion conforms generally to the corner
radius of the recess 44 and effectively biases the other leg into
engagement with the rear wall 40 of the tumbler 41. The felt may be
coated on one side with an antifriction layer such as
polytetrafluoroethylene to provide a smoother, more durable, and
lower friction running surface for engagement with the tumbler end
wall 40.
The front tumbler bulkhead 31 defines an access into the tumbling
chamber that is substantially aligned with the access opening 23 in
the front panel 19. The rear bulkhead 33 defines an opening
receiving a perforate panel 49 through which airflow is directed
into the tumbling chamber from a duct system as will be shown.
The tumbler sidewall 36 is supported on a generally horizontal axis
by a system including a pair of rollers 50 supported on brackets 51
fixed to the rear bulkhead 33 and by a pair of slide bearings (not
shown) supported by similar brackets fixed to the front bulkhead
31. The tumbler sidewall 36 could be supported entirely on rollers
or entirely on slides as conditions permit. The fabric tumbler
sidewall 36 is rotated by a belt 53 encompassing the periphery of
the sidewall 36 and driven by a motor 54 mounted on the base
15.
The airflow system for the clothes dryer 10 includes a fuel burning
heater supported adjacent the base and into which air is drawn from
the atmosphere for heating prior to movement into the fabric
tumbler 41. The heating system includes a fuel burner 60 and a
combustion chamber 61 as will be discussed in greater detail
hereinafter. The combustion chamber 61 is connected to a generally
upwardly extending rear air duct 63 which conducts heated air from
the combustion chamber 61 through the rear perforate panel 49 and
into the tumbling chamber 41.
The air then flows from the chamber 41 through a filter assembly 64
into the front air duct 66. The filter assembly 64 includes a
filter screen 65 supported within the air duct for removing lint
particles from the air leaving the tumbling chamber 41. The air is
drawn from the front air duct 66 into a blower assembly 69 from
which it is forced through a rearwardly extending lower air duct
70. The blower 69 includes an impeller (not shown) that is driven
by the motor 54 through the motor shaft 71. The general airflow
pattern within the drying apparatus is shown by the broken and
solid line arrows 74, 75 and 73 in FIG. 1.
Referring to FIG. 2, the heating system is shown in a longitudinal
view including the combustion chamber 61 in section. FIG. 3 in turn
shows a transverse section of the combustion chamber 61. The
heating system includes the conventional burner 60 fed by an
incoming gas line 76 and controlled by a valve mechanism 79. The
burner 60 and valve 79 are fixed to the base 15 through a bracket
80. The heating system further includes the combustion chamber 61
comprising a pair of housing portions 82 and 83.
The first housing portion 82 is fabricated of sheet metal in the
shape of a cone where the ends of the cone are both open and with
the larger end 84 receiving the egress end of the fuel burner 60.
The conical portion 82 is connected at the larger end 84 by a
bracket 86 to the base 15 and is connected at the other or reduced
end 85 to the second housing portion 83 as will be shown.
The second housing portion 83 is cylindrical and receives the
smaller end 85 of the conical first housing portion 82 in an
overlapping and radially spaced relationship. The opposite or rear
end 90 of the cylindrical portion extends into the upwardly
extending air duct 63 at the rear of the dryer and is connected
thereto by a bracket 89.
The forward end 91 of the cylindrical second housing portion 83
includes three circumferentially extending slots 93 spaced a short
distance from the end of the housing 83 so that portions of the
entry end 91 of the cylindrical housing 83 adjacent to the
circumferential slots 93 may be deformed inwardly as if reversed
relative to a chord line for contact with the periphery of the
smaller end 85 of the conical housing portion 82 as best shown in
FIG. 3. These three inwardly formed portions such as 94 may be
described as longitudinally extending arcuately shaped flanges for
effectively serving as connecting legs between the conical and
cylindrical combustion housing portions 82 and 83. A threaded
member 95 connects the two housing portions together at each of the
three inwardly extending legs 94.
As best shown in FIG. 3, this connection between the two housing
portions 82 and 83 defines a generally continuous annular air
intake 96. The intake is completely annular except for the
thickness of the sheet metal at the three inwardly extending legs
94.
It is thus seen, as best viewed in FIG. 2, that the combustion
chamber construction disclosed in this application provides for a
first air intake at the forward end 84 of the conical portion 82 in
the space surrounding the burner nozzle 60 and a second air intake
96 at the annular connection between the two housing portions 82
and 83 which is intermediate the opposite ends of the combustion
chamber 61.
It is also noted that the combustion chamber 61 is sloped upwardly
with respect to the base 15 and is disposed on an axis parallel to
the upwardly directed burner 60. The improved housing construction
providing for an enlarged terminal portion of the combustion
chamber 61 and for providing an intermediate secondary air intake
96 achieves improved burner operation by insuring sufficient
combustion air, by minimizing contact of the flame with the wall of
combustion chamber 61 to avoid formation of carbon monoxide
resulting from incomplete combustion, and by facilitating increased
airflow through the combustion chamber 61 to effectively reduce the
temperature at the combustion chamber wall.
It is thus seen that the instant invention provides an improved
heating apparatus for a gas burning clothes dryer wherein the
efficiency of the burning apparatus is improved through a
combustion chamber construction having an enlarged terminal portion
along with an improved secondary air intake at an intermediate
position of the combustion chamber.
In the drawings and specification, there is set forth a preferred
embodiment of the invention and although specific terms are
employed these are used in a generic and descriptive sense only and
not for purposes of limitation. Changes in form and the proportion
of parts as well as the substitution of equivalents are
contemplated as circumstances may suggest or render expedient
without departing from the spirit or scope of this invention as
defined in the following claims.
* * * * *