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Патент USA US2091600

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Aug. 31, 1937.
Filed Sept. 2, 1952
3 Sheets-Sheet 1
Aug. 31, 1937.
Filed Sept. 2, 1932
3 Sheets-Sheeil 2
l/ M
Pt/ïlliam G. Latimer
Aug. 31, 1937.
Filed Sept. 2, .1932
3- Sheets-Sheet 5
ïI/'ílliam G. Latimejr
BY /P Í ‘y f á Ã
Patented Aug. 31, 1937
entrar ori-‘ice
William G. Latimer, Detroit, Mich., assigner to
Kelvinator Corporation, Detroit, Mich., a cor
poration of Michigan
Application September 2, 1932, Serial No. 631,571
2 Claims. (C1. 15S-42.4)
The present invention relates to heating sys
tems and more particularly to burners using oil
for the fuel. This application is a continuation
in part of my copending application S. N, 488,521,
5 filed October 13, 1930, now Patent No. 2,011,901.
An object of the invention is to provide a
safety valve in the fuel line forI preventing the
flooding of the burner in the event of abnormal
operation. T'o carry this out I provide a continu
`l0 ous operating motor for supplying air for sup
porting combustion and utilizing a governor op
erated by the motor for maintaining the safety
valve open only as long as the motor is operating
normally and also utilizing a thermostat respon
»15 sive to the temperature of the burner for main
taining the safety Valve open only when the burn
er is heating above a predetermined minimum
Other and further objects and advantages will
20 be apparent from the following description, ref
erence being had to they accompanying drawings
The burner is of that type in which the fuel
is fed outward over a revolving disc and is dis
charged from the periphery of this disk to produce the flame. However, the construction dif
fers radically from those usually employed, first,
ployed for preventing combustion or overheating l0
of the fuel until it is discharged from the pe
riphery of the burner disc, the detailed con
struction being as follows:
D is a disc preferably formed of sheet metal
and integral and coaxial with a cylindrical sleeve
the disc and is then return bent at D3 with a
substantially cylindrical portion D4 extending 20
tion through the burner;
is provided at its center with the hub E2 detach
Figure 4 is a sectional view taken on line 5-5
Figure 5 is a bottom plan View of a portion
shown in Figure 3.
Figure 6 is a sectional top plan View of the end
35 of the burner;
Fig. 'I is a fragmentary plan View, showing the
governor control mechanism illustrated in Fig. 2
but on a larger scale;
Fig. 8 is a view of the mechanism shown in Fig.
40 7 but showing the arm S2 in a different position;
Fig. 9 is a sectional view taken on line l2--I2
of Fig. 2;
Fig. 10 is a perspective View of a thermostatic
control mechanism;
Fig. 11 is a cross sectional and fragmentary
View of the gas burner shown in Fig. 1 but on a
larger scale.
A shelf C is provided for supporting the motor
H. This shelf is preferably formed integral with
50 a vertically extending plate C’ which forms a
closure for the fuel door opening of a furnace.
Projecting inwardly from this plate or closure
and preferably formed integral therewith. is a
`cylindrical casing C2 which extends to substan
55 tially Vthe central plane of the furnace fire pot
portion D’. Between the cylindrical portion D’
and the disc is a slightly flaring or conical portion
D2 which extends outward beyond the plane of
backward and merging into the disc. The disc
D is mounted upon a spider E‘ which also carries
a disc E’ spaced from the disc D. The spider E
Figure 2 is a top plan View with parts thereof
shown in section;
Figure 3 is a View similar to Figure» 1 showing
the burner frame in section, the section being
taken on line ¿l-4 of Fig. 2;
in the manner of feeding and distributing the
liquid fuel thereon and second, in the means em
wherein a preferred embodiment is disclosed.
Figure 1 is a vertical central longitudinal sec
of Figure 3;
and has mounted at its inner end a rotary burner
as hereinafter described.
ably secured to a shaft F preferably by a threaded 25
engagement therewith. This shaft is journaled in
bearings G which are preferably carried by an
inner tubular housing member G’ mounted within
and secured at C4 to the outer cylindrical housing
C2. The opposite end of the shaft F is connected 30
to the shaft of the moto-r H preferably through
the medium of a universal joint I-I’ permitting of
slight inaccuracy in alignment. Thus the shaft
will be driven at motor speed and will communi
cate its movement first to the spider E and then 35
to the disc D and sleeve D’.
The fuel is supplied to the burner through a
nozzle I which is arranged to discharge the. liquid
at the base of the flaring portion D2 of the sleeve
D'. The sleeve D' extends into a housing G2 at 40
the inner end of the housing G’ and which forms
an air chamber through which air is to be sup
plied to the burner.
The arrangement is such
that the sleeve D’ is in close proximity to an an
nular bearing G3 in the housing G2 to form prac- 45
tically a sealed joint and beyond this bearing is
an annular portion G4 which extends in prox
imity to the disc D. On this annular portion G4
is mounted a non-revoluble disc J which is spaced‘
from the disc D a sufficient distance to permit the 50
passage outward of the liquid fuel film but close
enough to- protect the` fuel from ignition until it
is discharged from the periphery of the disc.
Thus in operation the fuel discharged from the
nozzle I will first come in contact with the outer 55
surface of the conical portion D2 of the sleeve D’
and through the combined action of capillarity
and centrifugal force will be fed spirally outward
on the revolving cone. T‘his continues until the
Ul fuel reaches the return bend D3 where its progress
is checked by the cylindrical return bent portion
discs D and E’ radially outward against the flame.
The valve L is preferably thermostatically con
trolled and to this end is mounted on a rock shaft
L’ passing horizontally outward through the cyl
inder C2 and having attached at its outer end a
spiral thermostat L3 of the bi-metallic type.
D4 so that by the time the fuel reaches the disc D
l/Vh-en the parts are cold the damper or valve
it is quite uniformly distributed. From this point
centrifugal action causes the film to move radial
ly outward until it is finally discharged from the
periphery of the disc D. The operation of the
burner will be fully described hereinafter, but
L will be substantially closed but after the burner
the effect of the mechanism thus far described
is to produce a uniformly distributed ñlm of
liquid fuel upon the. peripheral portion of the disc
D and without regard to whether the quantity
of fuel discharged by the nozzle I is large or
To render the fuel ignitible it is necessary that
it should be raised in temperature to near the
vaporizing point and to support combustion there
must be supplied the proper quantity of air pref
erably also preheated. The heating of the fuel
is eifected by surrounding the disc D with an an
25 nular member J ’ which as will be hereinafter
explained, is maintained at a temperature above
the Vaporizing point of the fuel. rI‘hus the ñlm. of
fuel which is discharged from the periphery of
the disc will be Vaporized when in proximity to
the member J ’ and will be discharged from the
outer end of said member as a combustible gas
burning in close proximity thereto. A portion of
the heat of combustion will be conducted back
through the member J ’ and will thus maintain
fo Cal said member at the desired temperature.
1t is,
however, necessary to first raise the temperature
of the member J’ by other means and to this
end I have provided a preheating gas burner K.
This is preferably formed by a disc K’ secured
to and extending outward from the disc J and
fashioned t0 form an annular channel K2 which
abuts against a flange C3 at the outer end of
the tubular housing C2. A gasket K3 seals the
joint between the disc K' and flange C3 so as
is to form a gas tight conduit which communicates
at one point with a supply gas conduit K4 ex
tending parallel to the casing C2 from outside
the furnace door. The outer wall of the channel
K2 is perforated at K5 to form gas jets adjacent
to the periphery of the member J', and an annu
lar shield K6 confines the gas within only a re
is heated the thermostat L3 by expanding will
rock the shaft L’ and open the valve. The degree
to which it is opened depends upon the tempera
ture of the casing which in turn depends upon
the size of the flame that is issuing from the
burner. Consequently whenever the llame is in
creased by a greater supply of liquid fuel the in
creased heat will affect the further opening of
the valve L so as to supply additional air for the
flame. A further function that is performed by
the passage of air through this
ourse is the
cooling of the shaft and inner portions of the 20
disc E' while the absorbed heat will raise the
temperature of the air to increase its efliciency
in supporting combustion. Further protection
against overheating the shaft and connecting
parts is through one or more secondary shields 25
lVl which are arranged outside. of the disc E" to
the peripheral portion of which they are at
tached. Thus air pockets are formed between
the shields M and the disc E’ which lessens the
amount of heat that can penetrate tothe disc E’. 3C)
As shown in Figure l a semi-cylindrical shield
N surrounding a portion of the housing C2 forms
a channel for the air through which a portion
of the air passing inward through the housing C2
will be returned outward through the ports N2 35
channel N1 and ports N3 and will be discharged
outside of the furnace. This circulation of air
will be constant during the operation of the fur
nace and will therefore prevent the overheating
of the housing C2 and the air passing there 40
through. This in turn will prevent overheating
of the bearings G. As a further precaution the
inner housing G’ is supported within the housing
C2 by members of restricted cross section such as
the screws C4 and dowel pin C5 so that very little 45
heat can be conducted inward through these
The gas conduit passes through the shelf and
connects to pipe K4 leading to the burner K.
The .amount of fuel fed to the burner may be 50
either manually or
automatically controlled.
stricted channel between the same and a flange
Preferably it is automatically controlled through
J2 upon the member J ’. Thus in starting, when
gas is supplied through the conduit K4 it will
burn just outside the restricted passage between
thermostatic means actuated by room tempera
ture and serving to open or close the liquid fuel
supply valve. Any suitable construction may be
employed for this purpose and as this. forms no
the member K6 and fia-nge J2 and will supply
suñicient heat to the. member J ’ for the initial
vaporization of the liquid fuel.
The air for supporting combustion is supplied
C? O to the llame through the space between the discs
D and E’. This space communicates through the
interior of the sleeve D' with the chamber with'
in the housing G2. Mounted on the housing G2
is a damper or air valve L which when open will
65 establish communication between the chamber in
the housing G2 and the space within the cylin
drical housing C2. Th-e air is propelled longitu
dinally through the housing C2 by means of a
suitable fan O or other air propelling device
driven by the motor, and as shown this fan is
mounted upon the. universal joint I-l’ and is ar
ranged within a housing O’ between the motor
H and the flange C’. Whenever the damper L
is opened a portion of vthis air will pass into the
housing G2 and through4 the space between the.
part of the present invention further description
is omitted.
The valve for controlling the admission of fuel
may be located at any convenient point external 60
to the furnace but in order to guard against
accidental discharge of fuel an automatic control
valve is also employed. This valve R is prefer
ably of the diaphragm control type and is located
adjacent to the shelf C. As shown, it is beneath
the shelf and comprises a ball R’ centrally above
a flexible diaphragm R2 having the stud R3 se
cured thereto which when moved upward Will
press the ball to its seat. Beneath the diaphragm
R2 is a lever R4 having one arm engaging
the stud R3 and its opposite arm provided with a
weight R5. The arm of the lever which engages
the stud R3 also bears against a vertical rod R6
which passes through the shelf C and upward
through the casing O’ and being provided at its
lower end with a ylaterally lextending arm #R7
passing out from said casingand having a handle
R5 in a position for manual operation tolift’the'
rod R6. . S is a movable stop which in oneposition
is in the path of the rod‘R6 so as toiprevent- the
lifting of the rod R5. ’ This stop »is provided with
a slot which receives a'stud VS1' which extends
downwardly from the free end_of a horizontal
lever S2 fulcrumed at S3 and bifurcatedi to» em
brace the shaft F.
Upon the shaft F is a centrifugal `governor T
having a slidable‘sleeve ‘T’ actuated by a spring
T2 lto bear against the lever S2vin a direction to
bei-iig heatedfthespring'ÜS‘i will move the -stop S
over rod `R‘î-after the-'motor attainswits normal
operating? speed and has retracted sleeve T1.
Fuel, as beforey described, passes-first on the in
clined or flaring `portion D2 of the sleeve around
the return bend D3 and? back on to the face of
the'.disk\D.»"»Thelouter portion of the disc has
already been heated so vthat' the film of oil
passing radiallyoutward meeting ‘the‘hot portion
of the disc will ‘be vaporized and will issue as `a lO
Arms'T4 are pivotally carried by a collar'l."5 se
stream of -gasffrom the' periphery of the disc. "At
the same time air which has passed from the fan
through the space within the conduit C2 will
reach the partly- open valve L and a portion will
passv into" the housing G2 and then through the
spaceîbetween thediscs D and E, striking against
the ñameat the periphery of the disc. This will
cured to a shaft F, which’arm's, when' thrown out
support smokeless combustion but as the air is not
withdraw the stop kS from'tl‘iepatlfiV of the rod R6.
15 The sleeve is actuated in the opposite direction by
links T3 connecting it‘to the Weighted ‘arms T4'.
centrifugally,` will overcome the tension of "spring ' commingled'with the gas until the air reaches
20 T2.
The stop S is also connected to a horizontal
rod S4. which ‘extends inward through the housing
C2 through a bearing S5 on the housing G2. A
spring S6 between this bea-ring and a collar S7 on
the rod yieldably holds the stop S extended to be
25 in the path of the rod R6.
In the event the fuel heating member J ' should
cool to such low degree that the fuel is not proper
ly vaporized to support proper combustion, as for
example, in case the fuel supply is exhausted,
30 means is provided for preventing flow of fuel
to the burner after the fuel tank is replenished.
A bi-metallic thermostat U, similar to spiral
thermostat L2, is employed for this purpose. This
thermostat when cooling will rock a bell-crank
35 lever U1 which in turn will move the rod S4 to the
right (as viewed in Fig. 4) causing stop S to move
to the right. The bell-crank lever Ul is loosely
mounted on the rod L' and comprises an arm U2
which lies in the path of spiral thermostat U and
40 is engaged by the end of the thermostat and
forced upwardly when the thermostat cools. The
bell-crank lever U1 includes a depending arm U3
arranged to engage the projection S8 on the rod S4.
The spiral thermostat U being disposed ad
the peripheral outlet'for the fuel, the name will
be white. In other words, a flame that is high in
radiant heat is produced, this being the most
efficient way of heating the furnace. The con
struction is one which requires very little atten
,tion after it is once started, but if for any reason it 25
should be required to clean the burner this may
be easily accomplished by swinging the burner
out from the furnace chamber and detaching the
rotary disc from the end of the shaft.
The annular groove which is formed by the 30
return bent portion D3 of the disc constitutes
in eifect a well in which a certain amount of the
liquid fuel is temporarily detained. The larger
the capacity of this well the longer the fuel will
be detained, which modiñes both the degree of
heat which is imparted to the fuel and the cool
ing effect' on the disc. Due to this fact I am
enabled to adapt my burner for either mild or
very cold weather by merely exchanging discs.
Thus the greatest efficiency is obtained when
the burner is operating low, as in the spring and
fall of the year, when used with a disc and a
cools the thermostat will cool to rock the bell
comparatively shallow well but in mid-winter
greater elliciency is obtained by using a disc hav
ing a deeper well. The changing of the discs
is so easily effected that this method of operation
may be much more satisfactory than retaining
crank lever U1 causing the arm U3 to move the
the one construction for all seasons of the year.
projection S8 to the right. This movement
causes the stop S to release rod R6 whereby the
weight R5 is effective to close the valve R1 to shut
off the flow of fuel to the burner.
As long as the motor is operating at its proper
speed and as long as the ring Jl is heated above
a predetermined minimum temperature, the stop
Where the burner is operating low, it is highly
desirable to maintain uninterrupted feeding of
the liquid fuel as otherwise there would be danger
of the burner going out. It is, however, difficult
to maintain a continuous liquid stream where
the quantity is small but I have avoided this
difficulty by placing the discharge end of the noz
zle I in very close proximity to the surface D2
on which the liquid is discharged. This has
the effect of maintaining the continuity of the
liquid stream due to capillarity, whereas if the
nozzle were spaced further from the revolving 60
surface the liquid might break up into drops.
45 jacent the heating ring J1, it is responsive to the
temperature thereof, therefore when the ring
is over the rod R.G and maintains the safety valve
R1 open. However, on failure of proper motor
operation or on decrease of temperature of the
ring J1, for any reason, below ‘a predetermined
minimum, the stop S is moved to render the
weight R5 effective to close the valve R1.
If it is desired to immediately run the burner
the gas starter may be first lighted before the
insertion of the burner and is then run for a
65 sufficient length of time to do the preliminary
The thermostat U will then be heated
Furthermore, a positive propulsion force for the `
fuel is exerted as an air seal is formed which
prevents back atmospheric pressure against the
fuel in the nozzle and therefore a suction effect
to the shaft F and disc Dafterwhich theliquid fuel `
is produced by the revolving disc. 'I'hus the liq
uid fuel will be fed successfully however small
the quantity.
By my improved arrangement, the fan O not
only supplies air for supporting combustion, but
also provides for cooling the moving parts of the
valve is opened by depressing rod R6 by pushing
burner within the furnace.
. sufficient to release the stop S so that the spring
S6 will be free to move said stop S over the rod R6
when the said rod is depressed. The motor is
then started which communicates rotary motion
downwardly on handle R8 which is connected with
A blast of cool air
is continuously forced over the moving parts to
arm R7. This permits the feeding of the fuel f thus keep them sufficiently cool even though the
through the nozzle I. The thermostat U then air valve L is closed, or substantially closed. 75
Some air at all times, is permitted to flow over
the working parts, which air expelled through
the ports N2 channel N1 and ports N3 to the ex
terior of the furnace or through the housing U4
Cl for the bell-crank U1 and thermostat U, Which
housing opens into the furnace and air passing
through said housing U4 prevents excessive heat
ing of these operating parts.
While the form of embodiment of the present
invention as herein disclosed constitutes a pre
ferred form, it is to be understood that other
forms might be adopted, all coming Within the
scope of the claims which follow.
What I claim as my invention is:
1. A fluid fuel burner comprising in combina»
tion, a rotating fuel feeding device, a fuel line,
a valve in the fuel line, said valve being urged
normally to a closed position, means responsive
to a predetermined temperature of the oil burner,
means responsive to the speed of the rotating
device, and a latch cooperating with the tem
perature responsive means and to the speed re
sponsive means and connections between said
latch and said temperature and speed responsive
means, whereby said latch is rendered operative
to hold said valve open only when the burner
temperature and the speed of the rotating device
simultaneously exceed predetermined minimum
2. A fluid fuel burner comprising in combina
tion, a rotating fuel feeding device, a fuel line, a
valve in the fuel line, said valve being urged to a
closed position, means responsive to a predeter
mined speed of the rotating device, means re
sponsive to a predetermined temperature of the
oil burner, and a latch cooperating With the speed
and temperature responsive means and depend
ent jointly upon the speed of the rotating device
being normal and upon the temperature of the
oil burner being normal for holding the valve
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