U.S. patent number 3,780,954 [Application Number 05/207,675] was granted by the patent office on 1973-12-25 for burner construction.
This patent grant is currently assigned to Robertshaw Controls Company. Invention is credited to Francis S. Genbauffs.
United States Patent |
3,780,954 |
Genbauffs |
December 25, 1973 |
BURNER CONSTRUCTION
Abstract
A burner construction having wall means defining a chamber for
receiving fuel from a source thereof, the wall means having a
plurality of port means passing therethrough and interconnecting
the exterior of the wall means with the chamber whereby fuel will
issue from the chamber out through the port means. The port means
are arranged in a pattern through the wall means to define a first
row of aligned spaced port means and a plurality of second rows of
aligned spaced port means transverse and adjacent to the first row
in spaced parallel relation to each other with the spacing between
adjacent second rows being greater than the spacing between
adjacent port means in the first row so that secondary air will be
provided in a sufficient amount for all of the port means of the
burner construction for proper fuel combustion.
Inventors: |
Genbauffs; Francis S. (Irwin,
PA) |
Assignee: |
Robertshaw Controls Company
(Richmond, VA)
|
Family
ID: |
26714349 |
Appl.
No.: |
05/207,675 |
Filed: |
December 13, 1971 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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37654 |
May 15, 1970 |
3647146 |
|
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Current U.S.
Class: |
239/560;
239/568 |
Current CPC
Class: |
F23D
14/105 (20130101); F24C 3/08 (20130101); F23D
14/58 (20130101) |
Current International
Class: |
F23D
14/48 (20060101); F23D 14/10 (20060101); F24C
3/08 (20060101); F23D 14/58 (20060101); F23D
14/04 (20060101); B05b 001/14 () |
Field of
Search: |
;239/568,559,560 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: King; Lloyd L.
Parent Case Text
This is a division of application Ser. No. 37,654, filed May 15,
1970, now U.S. No. 3,647,146.
Claims
What is claimed is:
1. In an apparatus having a cooking chamber, a source of fuel and
means for igniting said fuel, the improvement comprising a burner
construction for heating said cooking chamber and having wall means
defining chamber means for receiving fuel from said source thereof,
said wall means having a plurality of port means passing
therethrough and interconnecting the exterior of said wall means
with said chamber means whereby fuel will issue from said chamber
means out through said port means to be ignited by said means for
igniting said fuel, said port means being arranged in a pattern
through said wall means to define a straight line first row of
aligned spaced port means and a plurality of straight line second
rows of aligned spaced port means perpendicular to and crossing
said first row and in spaced parallel relation to each other with
the spacing between adjacent second rows being greater than the
spacings between adjacent port means in said first row, the central
port means of each second row providing one of the port means of
said first row, the number of second rows being such that a
plurality of straight line unported sections of said wall means
respectively defined between adjacent pairs of said second rows
lead perpendicularly to said first row to provide secondary air
therefor.
2. In an apparatus as set forth in claim 1, said wall means
defining a tubular structure having a substantially circular
cross-sectional configuration, said first row of port means
extending longitudinally along said tubular structure.
3. In an apparatus as set forth in claim 2, said first row
extending along the top of said tubular structure.
4. In an apparatus as set forth in claim 3, each port means
comprising a pair of spaced and cooperating ports passing through
said wall means, each port including a tab means having a free end
projecting into said chamber means beyond the interior surface of
said wall means and having another end attached to said wall means
on the side of its respective port that is adjacent to the tab
means attached side of the other port that forms said respective
pair of ports, said tab means and said ports being so constructed
and arranged that fuel is adapted to flow from said chamber means
in two streams respectively out of each pair of cooperating ports
and impinge against each other to form a substantially common
stream that is angularly disposed relative to said wall means.
5. In an apparatus as set forth in claim 4, the spacing between
adjacent second rows of port means being such that said second rows
cross said first row at every other pair of cooperating ports of
said first row.
Description
This invention relates to an improved fuel burner construction as
well as to an improved method for making such a burner construction
or the like.
It is well known from the U.S. patent to Branson, No. 3,386,431,
that a burner tube construction can be provided with port means
passing therethrough in two longitudinal rows on opposite sides of
the burner construction for creating flame patterns that readily
provide for sufficient secondary air to be drawn into the issuing
fuel for proper fuel flame characteristics.
In particular, it was found that such prior burner construction was
not only relatively simple and inexpensive to manufacture, but also
was adapted to permit a minimum flame characteristic so that the
oven could be maintained at a relatively low warming and
non-cooking temperature without subjecting the burner construction
to adverse flashback conditions or adverse flame sweep off
conditions as in prior known burner constructions.
One of the features of this invention is to provide an improved
port means pattern for such a burner construction or the like
wherein a high BTU rating per lineal inch of the burner
construction can be provided and still permit the burner
construction to provide the small or low flame pattern for low
temperature characteristics, as desired.
In particular, one embodiment of this invention provides a burner
construction having wall means defining a chamber means for
receiving the fuel from a source thereof, the wall means having a
plurality of ports passing therethrough and interconnecting the
exterior of the wall means with the chamber whereby fuel will issue
from the chamber out through the port means. The port means are
arranged in a pattern through the wall means to define a first row
of aligned spaced port means along the top of the burner
construction and a plurality of second rows of aligned spaced port
means transverse and crossing the first row with the second rows
being in spaced parallel relation to each other and with the
spacing between adjacent second rows being greater than the spacing
between adjacent port means in the first row so that sufficient
secondary air can be drawn to all of the port means for proper fuel
burning characteristics.
Accordingly, it is an object of this invention to provide an
improved burner construction having one or more of the novel
features set forth above or hereinafter shown or described.
Another object of this invention is to provide an improved cooking
apparatus utilizing such a burner construction or the like.
Another object of this invention is to provide an improved method
for making such a burner construction or the like, the method of
this invention having one or more of the novel features set forth
above or hereinafter shown or described.
Other objects, uses and advantages of this invention are apparent
from a reading of this description which proceeds with reference to
the accompanying drawings forming a part thereof and wherein:
FIG. 1 is a fragmentary, top perspective and schematic view
illustrating an improved apparatus of this invention.
FIG. 2 is an enlarged fragmentary, top perspective view of an end
portion of the burner construction of FIG. 1 with the flame pattern
produced thereby being illustrated in cross section by phantom
lines.
FIG. 3 is a top view of the burner construction.
FIG. 4 is a side view of the burner construction.
FIG. 5 is an end view of the burner construction.
FIG. 6 is an enlarged fragmentary cross-sectional view taken on
line 6--6 of FIG. 3.
FIG. 7 is a transverse cross-sectional view taken on line 7--7 of
FIG. 6.
While the various features of this invention are herein described
and illustrated as being particularly adapted for providing a
gaseous fuel burning burner construction for a cooking apparatus or
the like, it is to be understood that the various features of this
invention can be utilized singly or in any combination thereof to
provide burner means for other types of fuel burning apparatus as
desired.
Therefore, this invention is not to be limited to only the
embodiment illustrated in the drawings, because the drawings are
merely utilized to illustrate one of the wide variety of uses of
this invention.
Referring now to FIG. 1, an improved cooking apparatus of this
invention is generally indicated by the reference numeral 20 and
includes a cooking oven chamber means 21 defined by conventional
wall means 22 of the cooking apparatus 20. The cooking chamber 21
is separated from the improved burner construction 23 of this
invention by conventional baffle plates 24 and 25 extending between
the wall means 22, but being spaced therefrom and having apertures
26 passing thererthrough in a conventional manner so that the
heated air produced by the burner construction 23 of this invention
can readily circulate into the cooking chamber 21 in a conventional
manner.
Generally, the burner construction 23 of this invention includes a
burner tube 27 having a closed end 28 for being supported to
suitable burner supporting structure on the wall means 22 of the
apparatus 20 and another end 29 adapted to be disposed in a sealing
and telescoping relation with a venturi or fuel mixing member 30 by
a U pipe or conduit 31'.
The venturi tube member 30 has an end 31 telescopically carrying a
primary air adjustment member 32 in the manner fully disclosed in
the aforementioned U.S. Pat. No. 3,386,431, the end 31 of the
venturi tube member 30 being in fluid communication with the outlet
orifice means 33 of a conventional fuel control valve means 34
adapted to have its inlet interconnected to a source 35 of gaseous
fuel or the like. The source 35 is adapted to be interconnected to
the valve means 34 by conventional selector means 36 manually
operated by the housewife or the like, the selector valve means 36
also being adapted to interconnect the source of fuel 35 to a pilot
burner means 37 through a conduit means 38. The valve means 34 is
so constructed and arranged that the valve means 34 will only
interconnect the source of fuel 35 to the venturi tube 30 when a
flame sensing bulb 39 senses a flame 40 at the pilot burner 37 so
that fuel subsequently issuing from the burner construction 23 will
be ignited by the pilot flame 40 in a manner well known in the
art.
As illustrated in the drawings, the tubular member 27 of the burner
construction 23 has the majority of the length thereof provided by
a cylindrical portion having a uniform circular cross section and
being provided with a single longitudinally disposed top row 41 and
a plurality of transverse rows 42 of port means 43 arranged in a
pattern hereinafter described to permit fuel to issue from the
internal chamber 44 of the wall means 45 of the burner construction
23 to the exterior thereof and produce the heating flames 46 in the
unique pattern illustrated throughout the drawings in a manner
hereinafter set forth.
As illustrated in FIG. 6, each port means 43 of the rows 41 and 42
of the burner construction 23 of this invention comprises a pair of
cooperating ports 43' in such a manner that the flow of fuel to the
chamber 44 of burner construction 23 flows out of each pair of
cooperating ports 43' in two streams in the manner illustrated by
arrows in FIG. 6 to impinge against each other outboard of the wall
45 of the tubular member 27 and form a common stream substantially
perpendicular to the vertical wall 45 of the burner construction 23
to produce the flame pattern 46 as illustrated schematically in
FIG. 6.
Each port 43' is formed in the manner fully disclosed and claimed
in the aforementioned U.S. Pat. No. 3,386,431 and interrupts the
cylindrical wall means 45 of the burner construction 23 so as to
include a carved and inwardly bent tab means 47 angularly disposed
relative to the longitudinal axis of the burner construction 23 in
such a manner that the tab means 47 not only causes the angular
flow of fuel through the respective port 43' in the manner
illustrated by the arrows in FIG. 6, but also the tab means 47
effectively increases the cross-sectional thickness of the wall
means 45 of the burner construction 23 at the respective port 43'
in such a manner that a relatively small flame can be produced at
the port 43' and be effectively held therein so that an upward
draft or flow of air will not wipe such flame from the respective
port 43' and will not cause the small flame at the port means 43'
to create an adverse flashback condition in the burner construction
23. Conversely, the tab means 47 are so constructed and arranged
that substantially no blow-off of the flames 46 can be created,
even for a low flame setting of the burner construction 23.
Because each port 43' of each pair thereof causes an angular flow
of fuel in the manner previously described, it can be seen that a
substantially flame or fuel free triangular area 48 is defined
between the cooperating ports 43' of each pair thereof to draw
secondary air therebetween for good secondary air entrainment with
the fuel flowing from the ports 43'. In addition, a substantially
flame or fuel free triangular area 50 is created between adjacent
pairs of ports 43' in the manner illustrated in FIG. 6 so as to
also cause secondary air flow entrainment so that by the time the
flames 46 substantially merge together, improved secondary air
entrainment has been provided for effective fuel burning
characteristics.
The tab means 47 for each port means 43' has a substantially
rectangular configuration and is cut on two sides thereof, each tab
means 47 when bent inwardly out of the plane of the wall 45
defining its particular port 43'.
It has been found according to the teachings of this invention that
in order to utilize such port means 43' with a tubular burner
construction 23 of sensible diameter and in order to produce a high
BTU per lineal inch for the burner construction, the port means 43
can be arranged in the unique pattern of this invention as provided
by the longitudinal top row 41 and plurality of transverse
secondary rows 42, each second row 42 being bisected by the top
longitudinal row 41 and comprising two adjacent pairs of ports 43'
on opposite sides of the longitudinal row 41 while utilizing one
cooperating pair of ports 43' of the top row 41 therewith. The
spacing between adjacent second rows 42 is equivalent to one of the
pairs of cooperating ports 43' in the top row 41 thereof. Thus, it
can be seen that the second rows 42 cooperate with every other pair
of cooperating ports 43' of the top row 41.
If desired, each second row 42 can include more than the number of
port means 43 disclosed and such additional port means 43 are
indicated by dash dot lines in the drawings and are disposed on
opposite sides of the centerline of the tube 27.
It has been found that when a burner construction 23 has the burner
tube 27 thereof provided with approximately 7.985 inches in length,
a diameter of approximately one inch and with the longitudinal row
41 of port means 43' being approximately six and one-half inches
long with the second rows 42 of ports 43' being arranged with each
first pair of ports 43' thereof being disposed 30.degree. from the
vertical axis, with the second pair of ports 43' thereof being
disposed 60.degree. from the vertical axis and with the last pair
of ports 43' being disposed 20.degree. from the vertical axis when
viewing the transverse cross section of FIG. 7, with the wall
thickness of the tube 27 being approximately 0.035 of an inch with
each port 43' having a length of approximately 0.100 of an inch and
a width of approximately 0.100 of an inch while being spaced at its
far edge to the far edge of its cooperating port 43' approximately
0.200 of an inch and having its tab means 47 bent at an angle of
approximately 35.degree.relative to the radius of the tube 27, the
difference between adjacent center lines of adjacent pairs of port
means 43 in the top row 41 being approximately 0.325 of an inch,
such a burner construction is adapted to produce approximately 4000
BTU per lineal inch with all of the ports 43' receiving sufficient
secondary air through the unique flame pattern arrangement
thereof.
Therefore, it can be seen that this invention not only provides an
improved burner construction, but also the burner construction of
this invention has many of the unique features fully disclosed and
claimed in the aforementioned U.S. Pat. No. 3,386,431.
In addition, this invention provides an improved method of making
such a burner construction or the like.
While the form of the invention now preferred has been disclosed as
required by the statues, other forms may be used, all coming within
the scope of the claims which follow.
* * * * *