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Патент USA US2411230

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NOV. 19,
w_ A, RAY
‘
2,411,23Q
BURNER CONTROLv SYSTEM
‘Filed Jan. 29, 1945
-
3nventor:
'WILL'IAM A._RAY,
/,¢.‘ 2?.’
(Itiorneg.
Patented .Nov. 19, 1946
2,411,230
UNITED STATES PATENT OFFICE
.| BURNER CONTROL SYSTEM
William A. ‘Ray, Los Angeles, Call1'., assignor to
General Controls 00., a corporation
Application January 29, 1945, Serial No. 574,987
7 Claims.
(CI.
158--117.1)
.
My present invention relates to means ior con
trolling the operation of a ?uid-fuel burner sys
tem of the type which includes a main burner, a
pilot burner for the main burner, an electric ig
niter for the pilot burner, and an electrically op
erated valve for controlling supply of fuel to the
-
main burner.
An object of this invention is to provide, in a
system of the character - described, improved
means for delaying opening of the main-burner
valve until the pilot burner is safely ignited.
Another object is to provide means for pre
venting energization of, the igniting means for a
'
2 -.
end of the lower section 20 is closed by another
flexible diaphragm 22 to form a pressure cham
ber 23 below the main diaphragm 2i; another
pressure chamber 24, above the main diaphragm,
being formed by the upper section ill, the aperi
tured top end of which‘ is closed by a housing
25. While the valve I5 is open, the lower pres
sure chamber 23 is constantly subjected to the
' gas pressure through a horizontal inlet passage
26 in the section 20; a ?ow-restricting or o‘ri?ce
mmeber Zl being provided at the inner end of
this passage. Controlling ?uid pressure in the
upper chamber 24 is a three-way pilot valve
predetermined interval following closing of the
comprising a pair of jets 28 and 29 with which
main-burner valve.
‘
15 a movable blade-like closure 30' cooperates. The
Another object is to provide means responsive
jet 28 is ?tted in a horizontal passage ill in the '
to the flame of the pilot burner, which means is ‘ upper section it, which passage is in communica
activated and deactivated relatively slowly upon
tion with the inlet passage 26 through aligned
respective establishment and extinction of the
vertical passages .32 and 33 in sections l9 and
' ?ame, for effecting the delay referred ‘to in the 20 20, respectively. Cooperating with a reduced sec
preceding objects.
Another object is to provide, for eifecting the
delay, a motor, operated by the pressure of the
tion of passage 3i is a ‘sonically-pointed screw 34,
whereby ‘the rate of ?ow of gas to the jet 28 can
be adjusted. The jet 29 ?ts in another horizon
fuel in the system, for actuating switching means
tal passage 35 which leads through a pipe 36,
controlling energizatlon of the igniting means 25 in, series with a ?ow-restricting member 31, to
and the main-burner valve; the motor being ‘so
constructed that its operation in alternate direc
tions is relatively slow.
.
p
the atmosphere; the pipe 36, in practice, being
extended to a point adjacent the main burner it.
The pilot closure 30 is of magnetizable material
Another object is to provide means responsive
and is fulcrumed on the lower arm of a U-shaped
to the condition of the main-burner valve for 30 electromagnet core 38 mounted on the top sur
controlling energlzation of the igniting means.
face of section i9; a compression spring 38 bias
Other objects and advantages of the invention
ing the closure-armature 30 away from the upper
will be found inthe description, the drawing, and
arm of the core and into engagement with jet
the claims; and, for full understanding‘ of the
29. Around the upper arm of core 38 is an en
invention, reference is to be had to the following 85 ergizing coil till which is connected by wires 4!,
detailed description and accompanying drawing,
sealingly and insulatingly extending through the
the single ?gure of which is a view, mainly in
diagram, of a gas-burner control system embody-=- -
ing the invention.
top wall of housing 25, to a thermoelectric gen
erating device generally indicated at £2 and com
prising one or more thermocouples, contained
In the drawing, the numeral l l indicates a con 40 within a shell 613, having hot Junctions adapted
duit through which gas from a source (not shown)
to be heated'by the ?ame 44 of pilot burner I 2'.
is supplied to a main burner l2 under the con
Thermoelectric generating devices of the type
trol of an electromagnetically-operated main
commonly employed in gas-burner control sys
valve l3. Branching from conduit ll, ahead of
tems may be so constructed that their heating
the main valve i3, is a pipe it to the end of 45 and cooling (and the resultant growth and de
which is connected a pilot burner it’ for ignit
cay of generated current) are either relatively
ing the main burner. Controlling ?ow through
slowv or fast. Examples of such thermoelectric
pipe it is a. valve l5 comprising a manually-ro
generating devices are disclosed in the Ray Pat- ,
tatable plug it having a passage l ‘l. '
ent No. 2,340,899‘. In the device of Fig. 1 of
Connected to pipe it at the outlet side of valve 50 that patent, the elements are relatively light and
l5, by another pipe M’, is a fluid-pressure-oper
ated switch generally indicated at l8 and com
prising a pair of hollow casing sections 19 and
20‘ between. which is clamped at its margin a
main ?exible diaphragm 2i. The open bottom
their hot junctions (enclosed ,in_ thin stainless
steel protective sleeves) are exposed to the ?ame
or to the atmosphere and therefore heat or cool '
rapidly; whereas as, shown in Fig. 6, the ele
ments are relativela massive, and are surrounded
9,411,280
3
.
arm 49 is unaltered; this arm being biased to its
To
shown position mainly by the weight of the stiff
ening plates on opposite sides of main diaphragm
2|. The flow-restricting member 21 prevents the
possibility of upward‘ surge of the diaphragm 2|
e?ect delay of operation of the system herein
disclosed (in addition to such delay as may be
produced by the operation of the fluid-pressure‘
motor of switch l8) the thermoelectric generat
upon initial application of gas pressure. The
pressure of the gas acting on the lower diaphragm
ing device 42 may be so constructed that it heats
.and cools relatively slowly.
4
a of diaphragm 2| occurs and the position of switch .
. by insulating material and a relatively-thick met
. a1 jacket, so that they heat or cool slowly.
\
'
Connected, by a‘ link 45, to stiffening plates
_ 22 is ineffective to move the switch member 46
' between. Carried by the switch member 45 is a
' 38 that the armature-closure 30 is attracted out
arranged on opposite sides of the main dia 10 due to’ the pivotal arrangement of the same.
After a predetermined interval, determined by
is a switch member 45 rockably
the speci?c construction of thermoelectric gen
mounted on a pin 41 secured to a housing 48
erating device 42, the same becomes heated to a
which is attached to the lower section 2|) below
degree such that electricity is thereby generated
‘ diaphragm 22; the member 46 being in two sec—
tions joined together withgdiaphragm 22 there-, 15. in-an amount suilicient to so energize the core
contact arm 49 which cooperates with a pair of
contact blades 50 and 5| insulatingly mounted
on housing 48.
of engagement with jet 29 and into engage
ment with the other jet 28. When this occurs,
the gas compressed in the, upper chamber 24 is
blades 50 and 5| serves'to selectively control
ond” circuit, including winding 13, is completed,
as described hereinabove (it being assumed that
Indicated at 52 is a switch comprising a con 20 slowly vented to the atmosphere, through jet
29, restriction 31 and pipe 36;, the pressure in
tact arm 53 which is moved into engagement
the lower chamber then being effective to raise
with a ?xed contact 54, when the valve i5 is
the main diaphragm 2| and thereby rock the I
opened, by means of a- cam I5’ projecting from
contact arm 49 into'engagement with the upper
the valve plug l6. When switch 52 is closed, the
three-way switch constituted by arm 49 and 25 blade 50. In this position of arm 49 the “sec
‘ energization of two electrical circuits. ~ With arm
49 in engagement with blade 5|, as shown, a ?rst
circuit is completed which, comprises the sec
ondary 55 of a conventional A. C. service trans
thermostat 10 is in circuit-closing condition)
so that the closure 11 of valve I3 is raised and
30
former 5B, the primary 51 of an ignition trans- ‘
former 58, a thermal'cut-out 59, and'a switch 50
gas then passes to the main burner Where it is
ignited by the flame of the pilot burner.
In
the opening movement of valve l3, the arm 61
of switch 50 is moved (by an extension 18 or
operated by the valve l3; the circuit being traced
‘the solenoid plunger) out of engagement with
' from the righbhand side of the transformer sec
ondary 55 through wire 6|, switch arm 53, ?xed 35 contact 68 so that the igniting circuit is addi- ,
tionally interrupted at this point. During exist
contact 54, wire 62 and .fiexible extension 63,
ence of ?ame .at the pilot burner, the pressure
switch arm 49, contact blade 5|, wire 64, primary ~
operated switch is maintained in its “second" _
51 of ignition transformer 58, wire 55, thermal
circuit-connecting position; ‘ the main-burner
cut-out 59, wire 65, movable arm 61 and ?xed
contact 68 or switch 59, and wire 69 back to the 40 valve |3 then being opened and closed in ac
cordance with the demand of thermostat 1|].
other side of transformer secondary 55.
If the pilot-burner ?ame is extinguished ac
When, as will be described hereinafter, the
cidentally, or by closing of manual valve ‘i5,
switch arm 49» is moved into engagement with
upon resultant cooling of the thermoelectric gen
contact blade 5|], a second electrical circuit is
completed which comprises a thermostat 10, the 45 erating device the electromagnet core 38 is de
energized so that the armature-closure 30 is
electrically-operated valve l3, transformer sec
released and assumes the position shown in the
ondary 55 and switch 52—this circuit being traced
drawing. Gas can then pass through the open
from contact blade 59, through wire_ 1|, thermo
jet 28 into chamber 24 and, since this chamber
stat 10, wire 12, energizing coil 13 of solenoid
valve I3, and wire 69 back to the left—hand side 50 is now closed ,with respect to the atmosphere, the
?uid pressure therein gradually becomes the same
of transformer secondary 55; the portionof the
as that in chamber 23 below the main diaphragm
second circuit ‘from the right-hand side of the
I transformer secondary to contact arm 49 being
common with that of the ?rst circuit. The sec
ondary 14 of the ignition transformer 53 is con
so that that diaphragm falls under the force of
55
gravity, and the switch arm 49 is brought into
engagement with the lower contact blade 5| to
reestablish the “?rst” electrical circuit. If the
nected by wires 15 to a heating coil 16 for ignit
‘ extinguishment of the pilot-burner were due to -'
ing gas at the pilot burner I2’.
accidental causes, (other than .failure of gas or
In describing the operation of the system it
electric supply), the pilot burner would be im
will be assumed that the main burner I2 is ar
ranged to supply heat to aroom or space where 60 mediately reignited- since switch 52 is still in
closed condition. It follows that after a tem
in the thermostat 10 is located. With the parts
porary interruption of electrical service the burn
in the, positions shown in the drawing the sys
er system would automatically become operative.
tem is out of operation, as during a period when
Obviously, if extinguishment of the pilot burner _ ‘
no heating is required. To initiate operation of
the system, the plug I6 of valve vl5 is manually 65 were due to the closing of valve l5 (and resultant
rotated to open position so that gas issues from ,
opening of switch 52), the system would remain
the pilot burner.
ment of valve l5
"?rst” or igniting
scribed above and,
Since by the opening move
inoperative until valve l5 were again closed.
the switch 52 ‘is closed, the
Due to‘ .the ?ow restrictions provided by ‘
circuit is completed as de
members 21 and 31, and the restriction con
normally, after a brief inter 70 trolled‘by screw 34, the movement of the main
‘ ‘val the gas issuing from the pilot burner is ignited.
diaphragm 2| in both directions is relatively
With the opening'otvalve IS the pressure of the
slow;
and, further, the contact blades 59 and 5|
gas is applied tdjpoth of the chambers 23 and ’
24 of the pressure-operated switch l8 (the pilot
are spaced apart by a distance such that there is .
jet 28-being uncovered) so that no movement 75 an appreciable interval between the disengage;
‘2,411,980
ment ofarm 4s from one of the blades and its
I engagement with the other.
The thermal cut~out Ed is of conventional de
sign and operates to open the ignition circuit only
in the event of failure foffignition due to a defect
in the transformer 58 or ‘heating coil l6, or in the
event that the proper amount of gas fails to issue
from the pilot burner when valve i5 is opened.
The manual valve or r'g'asscock i5 is preferably
located at a point remote‘ from, the burner or fu
nace to avoid the possibility of injury of the per
son operating it if an explosion should occur. It‘
i 'will be observed that, to place the burner system
into or out of operation, the manualyalve i5 is
the only control device requiring attention; how
ever, for seasonal shut-off it is customary to pro
vide a main valve ahead of the system illustrated.
The embodiment of my invention herein shown
and described is susceptible of modi?cation with
3. In a gas-burner control, system: a main
burner; a pilot burner for said main. burner; a
manually operable valve for controlling supply of
fuel to said pilot burner; a ?rst electrical circuit;
electrical means in said ?rst circuit for igniting
the fuel at said pilot burner; a second electrical
circuit; an electrically operated valve in said
second circuit for controlling supply of fuel to
said main burner and biased to closed position; a
?rst switch ‘adapted to control a source of elec
trical energy for said circuits and actuated to
circuit-closing position by movement of said man
ually operated valve to open position; a second
switch in circuit with said ?rst switch and adapted
15 when the ?rst switch is closed, to connect‘ said
circuits individually to said source, the second
switch having two circuit-‘connecting positions
and being biased to ?rst-circuit-connecting posi
tion; a motor, operable by the pressure of the fuel,‘
out departing from the spirit of the invention, and 20 for actuating said second switch between said two
I intend therefore to be limited only by the scope
positions; a pilot valve for controlling operation
of the appended claims‘,
I claim as my invention:
of‘ said motor; means responsive to the ?ame of ,
'
-
the pilot burner for operating said pilot valve
1. In a gas~burner control system: a main‘
upon establishment of the flame to a position such
burner; a pilot burner for said main burner; a 25 that the second switch is ‘actuated to second
manually operable valve for controlling supply of
circuit~connecting position by the motor; and
fuel to said pilot burner; a ?rst electrical circuit;
means operatively associated with said-motor for
electrical means in said ?rst circuit for igniting
,so restricting ?ow of fuel with respect thereto
the fuel at said‘ pilot burner; a second electrical, ’ that actuation of the second switch is delayed for
circuit; an electrically operated valve in said sec? 30 a predetermined interval following the establish;
ond circuit for controlling supply of fuel to said
ment and the extinction of the ?ame.
main burner and biased to closed position; a ?rst
.' 4. In a gas-burner control system: a main
switch adapted to control a source of electrical
burner? a pilot burner for said main burner; a
energy for said circuits and actuated to circuit
manually operable valve for controlling supply of
closing position by movement of said manually r fuel to said pilot burner; a ?rst electrical circuit;
operated valve to open position; a second switch - electrical means in said ?rst circuit for. igniting
in circuit with said ?rst switch and adapted, when
the fuel at said pilot burner; a second electrical
the ?rst switch is closed, to connect said circuits
circuit; an ‘electrically operated valve in said sec
individually to said source, the second switch '
ond circuit for controlling supply of fuel to said
having two circuit-connecting positions and being
main burner and biased to closed position; a ?rst
biased to ?rst-circuit-connecting position; a
switch adapted to control a source of electrical
motor, operable slowly in opposite directions by
energy for said circuits and actuated to circuit
the pressure of the fuel, for acutating said second
closing position by movement of said manually '
switch between said two positions; valve means
operated valve to open position; a second switch
for controlling the operation of said motor; and
in circuit with said ?rst switch and adapted, when
means responsive to the flame of the pilot burner
the‘?rst switch is closed, to connect said circuits
for controlling the operation of said valve means.
individually to said source, the second switch hav
2. In a gas-burner control system: a main
burner; a pilot burner for said, main burner; a
manually operable valve for controlling supply of -
fuel to said pilot burner; a ?rst electrical circuit;
electrical means in said ?rst circuit for igniting
the fuel at said pilot burner; a second electrical
circuit; an electrically operated valve in said sec
ond circuit for controlling supply of fuel to said
main burner and biased to closed position; a ?rst
switch adapted to control a source of electrical
energy for said circuits and actuated to circuit
ing two circuit-connecting positions and being
biased to ?rst-circult-connecting position; a mo
tor for actuating said second switch between said
two positions and comprising means forming a
pair of pressure chambers separated by a mova
' ble partition; means operatively connecting said
partition to said second switch; means under the
control of said manually operated valve for sub
jecting both of said chambers to the pressure of
the fuel when the manually operated valve is
opened so that the second switch remains tern‘
closing position by movement of said manually
porarily in its biased position; a pilot valve for
operated valve to open position; a second switch 60 venting one of the chambers so that the pressure
in circuit with said ?rst switch and adapted,
of the fuel in the other of the chambers is effec
when the ?rst switch is closed, to connect said
tive to move the partition slowly in a direction
circuits individually to said source, the second
such that ‘the second switch is actuated to second
switch having two circuit-connecting, positions
and being biased to first-circuit-connecting posi
tion; a motor, operable slowly in opposite direc
tions by the pressure of the fuel, for actuating
circuit-connecting position; and means respon
sive to the ?ame of the pilot burner for operating
said pilot valve.
5. A system, as de?ned in claim 4, including
said second switch between said two positions;
means for so restricting ?ow of fuel with respect
a pilot valve for controlling operation of said
to the motor that actuation of the second switch
motor; and means, responsive to the ?ame of 70 is delayed for a predetermined interval following
the pilot burner, effective only after a predeter
the establishment and the extinction of the pilot
mined interval following establishment of the
burner flame°
?ame to operate said pilot valve to a position such
- 6. In a gas~burner control system: a main
that the second switch is actuated to second-cir
burner; a pilot burner for said main burner; a
cult-connecting position by the motor.
75 manually operable valve for controlling supply
2,411,280‘ ‘v
-
7
burner; a ?rst electrical
of fuel to said pilot
circuit; electrical means in said ?rst circuit for
igniting the fuel at said pilot burner; a second
electrical circuit; an electrically operated valve
in said second circuit for controlling supply of
fuel to. said main burner and biased to closed po
-
sition; a ?rst switch adapted to control a source
of electrical energy for said circuits and actuated
8
a ?rst switch adapted to control a source of elec~
, trical energy for said circuits and actuated to
circuit-closing position by movement of said man
ually operated valve to open position; a second
switch in circuit with said ?rst switch and
adapted, when the ?rst switch is closed, to con
nect said circuits individually to said source, the
second switch having two circuit-connecting po
sitions and being biased to ?rst-circuit-connect
manually operated valve to open position; a sec 10 ing‘posltion; a motor for actuating said second
switch between said twov positions and compris
ond switch in circuit with said ?rst switch and
to circuit-closing position by movement of said
adapted, when the first, switch is closed, to corn I
ing means forming a pair of pressure chambers
separated by a movable partition; means opera
tively connecting saidpart-ition to said second
sitions and being biased to ?rst-circuit-connect 15 switch; means under the control of said manual
ly operated valve for subjecting both of said
ing position; a motor, operable slowly in opposite
chambers to the pressure of the fuel when the
directions by the pressure of the fuel, for actu
manually operated valve is opened so that the
ating said second switch between said .two ‘posi
second switch remains temporarily in its biased
tions; a pilot valve for controlling operation of
said motor; an electromagnetic device for operat 20 position; a pilot valve for controlling fuel pres
nect said circuits individually to said source, the
second switch having two circuit-connecting po
ing said pilot valvé; and a thermoelectric gen
erating device, arranged for heating by the ?ame .'
of the pilot burner, for energizing said electro
sure in one of the ‘chambers; an electromagnetic
device for operating said pilot valve and e?ective
when energized to operate the ‘pilot valve to a‘
position wherein said one of the chambers is
magnetic device, the thermoelectric generating
device being so constructed that it heats and cools’ 25 vented, so that the pressure of the fuel in the
a ‘other of the chambers can move the partition
slowly so that operation of the pilot valve-‘is de
slowly in a direction to actuate‘, said second
layed for a predetermined interval following the
switch to second-circuit-connecting position; and
establishment and the extinction of the ?ame;
a ‘thermoelectric generating device for energiz
'7. In a gas-burner control system:' a , main
ing said electromagnetic device, the thermoelec
burner; a pilot burner for said main b_umer;,_a
manually operable valve for controlling supply’ "trlc generating device being so constructed that
it heats and cools slowly so that operation of the
A of fuel to said pilot burner; a ?rst electrical cir
is delayed for a predetermined
‘ cuit; electrical means in said ?rst circuit for is
‘pilot
valve
7
‘interval following the establishment and .the
trical circuit; an electrically operated valve in 85 extinction of the ?ame.
niting the fuel at said pilot burner; a second elec
said second circuit for controlling supply of fuel
to said [main burner and biased to closed position;
-
WILLIAM A. RAY.
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