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Патент USA US3042120

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July 3, 1962
Filed Dec. 16, 1957
3 Sheets-Sheet 1
Vi'rlor Waba- and.
July 3, 1962
Filed Dec. 16, 1957
3 Sheets-Sheet 2
Via‘or Weber and
July 3, ‘1962
Filed Dec. 16, 1957
3 Sheets-Sheet S
Vida! WZQM and
United States latent
Patented July 3, 1962
produce a condition that will insure complete ignition at“
low inputs to the burner.
Another object of the invention is to design an inex
pensive and easily manufactured burner body for a device
of the above-indicated character.
Richmond, Va., a corporation of Delaware
In the preferred embodiment of the invention, the
Filed Dec. 16, 1957, Ser. No. 703,031
burner body is ring-shaped so that the sensing element
2 Claims. (Cl. 158-116)
of the thermostat may be positioned within the central
This invention relates generally to burners for gase
opening of the burner. The burner body has an annular
ous fuels and more particularly to thermostatically con 10 opening in its top in which a ring of low heat conduc
trolled top surface burners for cooking ranges.
tivity is positioned. The burner port ring is mounted
One di?iculty that has been experienced in thermo
on the low heat conductive ring to form the burner ports
statically controlled top surface burners for cooking
therewith. The port ring also has an extension which
ranges is that of e?icient heating. Since the sensing
forms an inner seal with the burner body. Stable burn
means of the thermostat is best installed within the ring
ing at low inputs is accomplished by (1) providing
of the burner, the diameter of the burner ring of neces
?ange-like projections on the port ring and burner body
Victor Weber and Qharles D. Branson, Greenshurg, Pa,
assignors to Rohertshaw-Fulton Controls Company,
sity becomes relatively large thereby moving the ?ame to
so as to prevent any upward draft of air from carrying
ward the outside edges of the bottom of any cooking
vessel placed upon the burner. This tends to lower the
heating e?iciency of the burner since it permits less inti
the gas away from the ports before it is burned, (2) pro
viding an additional port in the burner ring which has
considerably improved ?ame stability and which provides
mate and complete contact between the ?ame and the
ignition for the other ports, and (3) holding the tempera
bottom of the cooking vessel.
ture of the port ring high by the use of the ring of low
Another di?iculty encountered in burner design is the
heat conductivity.
prevention of ?ashback (ignition occurring at the ori?ce
The above and other objects and features of the in
in the venturi). Flashback has a marked tendency to N) Cl vention will appear more fully hereinafter from a con
occur when the ratio of port length to cross-sectional
sideration of the following description taken in connec
area is too low.
tion with the accompanying drawings wherein a preferred
In the case where standing pilots are used, another dif
embodiment of the invention is illustrated by way
?culty encountered in the design of burners for use with
of example.
thermostatically controlled means is poor ignition at low
In the drawings:
inputs when the control valve is just throttling. The
FIG. 1 is a plan view of the preferred embodiment of
design must be such that ignition will occur all the way
the invention installed in a gas range;
around the burner at low inputs. Otherwise, raw gas
FIG. 2 is a partial cross-sectional view taken along
will be allowed to escape into the air around the range.
line II——II of FIG. 1;
Many burner installations of this type employ a by
FIG. 3 is an elevational view partly in cross-section
pass around the thermostatically operated valve. In these
cases, it is highly desirable to have the by-pass adjustment
as low as possible to attain low temperatures in the cook
ing vessel and to provide burner ignition by the conven
tional ?ash tube to eliminate the heat input of a stand
ing pilot from the burner location. Since the ?ash tubes
do not ignite well with extremely low burner inputs, very
stable burning is necessary at the burner.
Another di?iculty encountered in installations of this
type is the design of a burner body so that it may be
easily and inexpensively manufactured. In order to elim
inate the need for drilling, which is a relatively high—cost
manufacturing operation, and to provide a burner body
that may be manufactured by a relatively inexpensive die
casting operation, it is necessary to design the burner
body so that metal cores that can be pulled from the
?nished casting may be used.
It is an object of the invention to achieve high e?i
ciency in ‘heating in a burner installation of the above
indicated character without decreasing the port length
to the point at which ?ashback is encountered.
Another object of the invention is to prevent ?ashback
in a burner installation of the above-indicated character.
Another object is to insure stable burning in a burner
installation of the above-indicated character at low in 60
Another object is to prevent the upward draft of air
of the arrangement shown in FIG. 1;
FIG. 4 is a fragmentary view in elevation of a detail;
‘ and
FIG. 5 is an enlarged view taken on line V——V of FIG. 4.
Referring more particularly to the drawings, the top
surface burner illustrated therein includes a conventional
grate 10 ‘and re?ector pan 12 mounted horizontally on
a range top 14. The re?ector pan has a central opening
16 in which is mounted the burner head 18 of the burner.
The ‘diameter of central opening 16 is large enough to
provide an annular secondary air port 19 for ventilating
the burner head.
The burner includes a body 20 having a vertical, cir
cular inner wall 22 and an outer wall 24. Inner wall 22
has a cylindrical top portion 23. The internal diameter
of inner Wall 22 forms a central opening in body 20.
Outer wall 24 has a generally annular top portion 26
which is contiguous with the top portion 23 of inner
wall 22 and forms an annular passageway 28 in the top
of the body 20. The remaining portion of the outer wall
24 slopes downwardly and outwardly as shown in FIG. 3
to a point at which the bottoms of the inner and outer
Walls 22, 24- are in the same horizontal plane.
A venturi and mixing tube 30, having communicating
horizontal and vertical tube portions, is attached at the
top of its vertical portion to the bottom of body 20 by
means of a conventional adapter plate 32. Adapter plate
32 is mounted on body 20 by screws 34, 36 which en
around the top surface burner of a gas range from wash
gage threads in ?ange portions 38, 40, respectively, on
ing the gas away from the burner ports before it can
be burned.
65 body 20. Plate 32 is joined by means of screws 34-, 36
to body 20 and a gasket 42 seals the joint therebetween.
Another object of the invention is to minimize the
An air-tight ?tting 44 is provided in adapter plate 32 for
heat loss from the port ring of va burner installation of
tube 30. Gasket 42 contains a port 46 surrounding the
the above-indicated character in order to assist steady
burning at low inputs.
opening in the top end of the vertical portion of tube 30.
Hence, the port 46 acts as an inlet port for the ?ow of
Another object of the invention is to space the ports of 70 gas from tube 30 into body 20.
a burner installation of the above-indicated character to
The top portion 26 of outer wall 24 has horizontal
_ 3,042,110
annular recess 48 on its internal diameter. An annular,
cup-shaped‘ ring 50 of low conductivity is supported on
recess 48 with the side wall portion 52 of ring 50 resting
thereon so that the base portion 54 of ring 54} is in a.
horizontal plane above the top plane of burner body 26..
The top of sidewall portion 52 cooperates with recess 48v
to tr'orm a gas seal therewith.
Base portion 54 has a cen
of gas and air then passes through the venturi and mix
ing tube 30 into burner chamber 66. The mixture of
gas and air leaves burner chamber 66 by way of annu
lar outward passageway 68 and passes into the burner
ports 63 and burning takes place at the port outlets.
The burner ports 63 are so spaced that at very low
gas ?ows there is a merging or mixing between the gas
tral opening ‘56 therein, the diameter of which is greater
than the internal diameter of inner wall 22 of body 20
streams from the individual ports so as to form an
main body portion. Extension 64 is positioned within
inner wall 22 of the burner body 20 and is so sized that
there may be enough gas issuing from port 73 to sus
its outer diameter forms a high restriction seal against
the internal diameter of inner wall 22. The cylindrical
turn ignite several of the ports 63 in the immediate region
of port 73 so that there is steady burning in the region
of the port 73 because of the concentration of out?ow
ing gas in this region. This concentration of out?ow
almost continuous ring of gas around the burner head
for a purpose to be hereinafter described.
10 outside the ports and within the oppositely disposed
?anges 7t} and 72. Hence, it will be apparent that ?anges
An annular port ring 58 is horizontally mounted on
70 and 72 actually de?ne an annular ignition chamber
base portion 54 of ring 50 by supporting an annular rib
therebetween. These ?anges are e?ective to accumulate
portion 60 of the port ring 58 thereon. The internal
the gas in this ignition chamber at low gas ?ows and
diameter of rib portion 60 is preferably the same as the
prevent the gas from being carried away from the burner
diameter of central opening 56 in base portion 54, and
ports 63 by air currents until the gas is ignited. It has
the width of rib portion 64} is approximately equal to- the
been found that 54 to 60 ports or slots of 1/16 inch width
width of base portion 54. Rib portion 60 has a plurality
and equally spaced give proper spacing for good ignition
of open-ended port slots 62 spaced in a horizontal plane
if the ?anges 70 and 72 are provided.
around the periphery thereof extending the full width of
the rib portion and facing the base portion 54 so as to 20 Port 73 also aids in causing steady and stable burning
at low inputs. Because port 73 has more favorable feed
de?ne a plurality of burner ports 63. The side wall por
conditions, it offers considerably improved ?ame stability
tions of slots 62 are parallel to each other and the roof
‘than the other ports. Since the ports are so ‘spaced that
is slanted upwardly and outwardly ‘from the internal di
at low gas flows there is a merging between the gas
ameter of rib portion 60. Hence, the burner ports 63
will slightly ‘diffuse the jet of gas issuing therefrom and N) UK streams from the individual ports, port 73 provides igni
tion for the other ports to prevent the escape of gas into
direct it more quickly toward the cooking vessel bottom
the ambient air under low inputs to the burner.
which results in more efficient heating. Flashback is
When the supply of gas is throttled ‘down to a point
prevented by maintaining a su??cient port length to cross
at which there is insu?icient gas issuing from all of the
sectional area ratio.
Port ring 58 has a cylindrical extension 64 at its inner 30 ports around the periphery of the burner head to sus
tain a steady ?ame completely around the burner head,
portion which extends vertically downward from ‘the
extension 64 of port ring 58, the ring 50, and gasket 42
tain a steady ?ame thereat.
This steady ?ame will in
cooperate with burner body 20 to de?ne a burner cham
ing gas is a result of several factors. Firstly, there is a
ber 66. ‘Inasmuch as the outer diameter of the cylindri
greater burner port area in this region because of addi
cal extension 64 is less than the diameter of the central
opening 56 in ring 50, burner chamber 66 has an annu 40 tional port 73. Secondly, there are more favorable feed
conditions to this region because of the location of port
lar outlet passageway 68.
The outer portion of port ring 58 is provided with an
annular ?ange 70 extending horizontally outwardly of
the port ring 58 above the rib portion 69. The top por
tion 26 of outer wall_24 of the burner body 20 also has
an annular ?ange 72 disposed opposite annular ?ange 70
beneath the gas outlet ports 63.
' As is illustrated in FIGS. 4 and 5, rib portion 60 is
also provided with a small additional port 73 in the form
of a drilled hole. Preferably, port 73 is slightly higher
than the top plane of the burner ports 63 so that it would
have a more favorable feed condition at low ?ows than
the burner ports 63.
Communicating with the horizontal portion of vcnturi
and mixing tube 30 is a conventional air shutter 74 for
controlling the mixing of the primary air with the gas.
73. Thirdly, the temperature of the burner ring in this
region will be higher because a steady ?ame is main
tained in this region while the ?ame will be extinguished
for temporary periods at the other regions of the pe
riphery remote from the additional port 73. Hence, it
will be apparent that the ?ame coming from burner
chamber 66 will be'attracted to the region with the high
est temperature.
During the operation of the burner under this condi
tion where a steady ?ame is maintained only in the
region immediate said additional port means 73, the gas
issuing from the unlighted ports around the periphery of
the burner ring will be accumulated in the annular
C1 Ur ignition chamber between ?anges 70 and 72. When a
sufficient amount of gas is accumulated, it will be ignited
by a ?ame travelling around the burner in a Well known
Thermostatic means are provided for controlling the
manner from the steady ?ame region in one direction or
?ow of gas to the venturi and mixing tube 30 in response
to the temperature of the cooking vessel. A conventional
another depending on the draft conditions in the area of
thermostatic valve 76 is set at a desired temperature by 60 the burner. As the amount of gas issuing'from the
means of a control knob 78. A thermal sensing ele
regions on the periphery remote from the additional port
ment 80, which is responsive to the temperature of the
73 is insu?icient to sustain a ?ame, the ?ame travelling
around the burner will be extinguished after the ac
cooking vessel, is operative to close the valve 76 when
the temperature of the cooking vessel reaches that set
cumulated gas is burned. When a su?icient amount of
by knob 78 by causing an expansion of an expansible
?uid in tube 82 which in turn controls the valve 76. The
sensing element 80 is mounted within the central open
ing in burner body 20 by any suitable means, such as
plate 84, so that element 80 contacts a cooking vessel
placed ‘on grate 10.
gas is subsequently accumulated, the travelling ?ame
will again be effective as above described. Hence, there
will be little or no unburned gas escaping into the medium
‘around ‘the burner.
Ring 50 is preferably made of aluminum coated steel.
The aluminum protects the steel from corrosion and the
steel, by virtue of its low heat conductivity, minimizes
the loss of heat from port ring 58.
It will be apparent that the use of parts such as ring
from an inlet tube 86 which communicates with a sup
50 and port ring 58 in the construction of the burner
ply of gas. The gas then passes into the air shutter 74
where it is mixed with the primary air. The mixture 75 makes it possible to manufacture the burner body 20
In the operation of the embodiment of the invention
disclosed, the burner gas enters thermostatic valve 76
by using metal cores which can be pulled from “the ?n
ished casting. The fact that the cores can be pulled
makes it possible to make the burner body 20 by the
die-casting process, which is a relatively low-cost manu
facturing process. Ring 50 and port ring 58 also lend
themselves to low~cost manufacturing methods. Ring
50 can easily be formed by stamping and port ring 58
can be die-cast.
FIG. 2 shows a standing pilot 88 which is used in those
installations not equipped with a by-pass. In this type of
installation, the thermostatic valve may completely throt
tle the ?ow of gas to the main burner and, upon opening,
may supply only very small ?ows of gas which must be
said burner body being disposed below said series of
burner ports and cooperating with said annular ?ange to
de?ne an accumulation chamber therebetween for un
burned gaseous fuel, said annular projection being larger
than said annular ?ange to direct an upward ?ow of air
past the accumulation chamber, and means on said rib
member de?ning an additional port spaced above and
between a pair of said series of burner ports, said addi
tional port communicating with said outlet passageway
10 to provide su?icient gaseous fuel for maintaining a ?ame
in the area of said additional port.
2. In a burner assembly for maintaining a ?ame at a
surface cooking device, the combination comprising a
burner body member having annular inner and outer
re-ignited by the standing pilot. It is this condition which
requires good ignition characteristics in the burner.
From the foregoing description, it is apparent that
15 walls de?ning an inlet passageway for receiving a gaseous
stable burning at low inputs has been achieved by the use
tions on said inner and outer walls de?ning an annular
mixture of fuel gas and primary air, spaced upper por
of protective ?anges 70 and 72, the additional port 73,
chamber therebetween, an annular recess means on the
and ring 50. Protective ?anges 70 and 72 prevent the
interior of the upper portion of said outer wall, a gen
upward draft of air around the burner from washing the 20 erally cup-shaped ring mounted on said annular recess
gas away from the burner ports 63 before it can be
burned. The resistance to heat conductance of ring 50
helps to hold the temperature of the port ring 58 high
means and having a portion extending partially across
said annular chamber, an annular burner head having a
cylindrical extension engaging the exterior of the upper
which materially improves steady burning at low inputs.
portion of said inner wall, said cup-shaped ring portion
The resistance to heat ?ow provided by the arrange 25 terminating in spaced relationship to said cylindrical ex
ment can be a combinaion of the lower conductivity of
the material of which port ring 58 is made and the re
sistance to heat ?ow afforded by the joint between port
ring 58 and burner body 20 or it can only be the resist
ance of the joint. It has been found that aluminum,
which is a good heat conductor, can be used in the ring
'50 since the resistance to heat ?ow of the joint is so high.
While these features are essential for stable burning at
low inputs, they offer little or no hindrance at high in
puts when the velocities of the ‘gas-air mixture coming
from the burner ports 63 is high. At high input, the burn
tension to de?ne an outlet passage therebetween, an annu
lar rib on the undersurface of said burner head resting on
said cup-shaped ring portion to support said burner head
thereon, a series of open-ended slots in said annular rib
cooperating with said cup-shaped ring portion to de?ne
a series of burner ports in communication with said out
let passageway, a, radially outwardly extending ?ange
member on said burner head disposed above said series
of burner ports to accumulate unburned portions of the
gaseous mixture, an annular ?ange on the top portion of
said outer wall cooperating with said ?ange member to
ing occurs outside the ?anges 70, 72 so that their e?ect is
de?ne an accumulation chamber therebetween extending
radially outwardly a distance greater than said ?ange
It is to be understood that although only one embodi
member whereby a ?ow of secondary air about said outer
ment of this invention has been shown and described, the 40 wall passes the accumulation chamber, and an ignition
invention can be variously embodied and changes may be
port means extending through said rib member above and
made in the construction and arrangement of the parts
between a pair of said series of burner ports and being in 7
without ‘departing from the scope of the invention as
communication with said outlet passage to provide a
de?ned by the appended claims.
su?’icient ?ow of the ‘gaseous mixture to maintain a ?ame
We claim:
45 in the area of the ignition port means.
1. In a burner assembly, the combination comprising
a burner body having spaced annular inner and outer
References Cited in the ?le of this patent
walls de?ning an inlet passageway therebetween, a sup
porting ring carried by an upper portion of said outer
Nicolaus __________ __.___ May 16, 1922
wall, an annular burner head having an annular rib mem 50
Grayson _____ __' _______ __ July 2, 1946
her on the undersurface thereof resting on said ring for
Cole _______________ __ Dec. 21, 1948
Reeves ______________ __ Dec. 13, 1949
downwardly from said burner head for engagement with
‘an upper portion of said inner wall, said supporting ring
being spaced from said cylindrical member to de?ne an
Du Perow _____________ __ Apr. 1,
Taylor ______________ __ Sept. 23,
Broddeck et al _________ _. July 15,
Jensen ______________ __ Sept. 30,
outlet passageway therebetween for a ?ow of gaseous
fuel from said inlet passageway to said series of burner
Reinhart ____________ __ Nov. 18, 1958
Hollman et al. _______ __ Aug. 11, 1959
Netherlands _________ _.._ Nov. 17, 1923
supporting said burner head thereon, said rib member
having means cooperating with said ring to de?ne a
series of burner ports, a cylindrical member extending
ports, an annular ?ange extending outwardly from said
burner head and being spaced above said series of burner
ports, and an annular projection on the outer wall of
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