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Патент USA US3090433

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May 21, 1963
C. M. GARNER ETAL
3,090,423
GAS BURNER CONTROL
Filed May 14, 1958
2 Sheets-Sheet 1
FIG.
2
INVENTORS
LAUDE M GARNER
SOHN C ATTERBURY JR
THEIR
AGENT
May 21 ,
1963
C. M. GARNER ETAL
3,090,423
GAS BURNER CONTROL
May 14, 1958
2 Sheets_5heet 2
Fla. 3
05d
60 58
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. ATTERBURY JR.
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THEIR 'AGEN
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United States Patent 0
11
1
3,090,423
GAS BURNER CONTROL
Claude M. Garner, Clayton, and John C. Atterbury, .lr.,
Richmond Heights, Mo., assignors, by mesne assign
ments, to White-Rodgers Company, a corporation of
Missouri
Filed May 14, 1958, Ser. No. 735,165
4 Claims. (Cl. 158-125)
This invention relates to controls for gaseous fuel burn
ers, and more particularly to means for automatically op
erating the burner in an on and off manner over a wide
range of heat output rates while maintaining high ther
mal ei?ciency of the burner.
3,696,423
Patented May 21, 1963
2
ated therewith fuel metering and control valve mecha
nism constructed in accordance with the present inven
tion;
FIG. 2 is an enlarged sectional view taken on line
2-2 of FIG. 1;
FIG. 3 is an enlarged sectional view taken on line
3-3 of FIG. 1;
FIG. 4 is a still further enlarged fragmentary detail
view of the fuel ori?ce and metering needle;
FIG. 5 is a cross-sectional view taken on line 5—5 of
FIG. 4; and
FIG. 6 is a diagrammatic view of the entire control
system.
Referring to the drawings in more detail, the numeral
It is customary to control the ?ow of gas to a burner
by means of a valve spaced at some distance from the 15 10 generally indicates a main gas burner to which a com
burner and to provide a restricting ori?ce posterior to
the valve and at the base or inlet to the burner mixing
bination dual valve and metering device generally indi
the velocity of the aspirating fuel jet a?eots the quality
into three chambers, namely, the fuel inlet chamber 26,
cated ‘at 12 and a pilot burner generally indicated at 14
are attached by means of a bracket 16. The bracket 16
tube in order to create a relatively high-velocity fuel
also serves as a means of rigidly mounting the burner
stream or jet for aspirating combustion air into the burn
er tube. ‘In this arrangement if the fuel ?ow is throt 20 and fuel control assembly in an appliance such as a clothes
dryer. The dual valve and fuel metering device includes
tled at the valve in order to effect a reduction in the heat
an elongated, hollow valve body 18 having an axial fuel
output rate of the burner, the pressure on the upstream
inlet 20 at one end, a lateral main burner fuel outlet 22
side of the fuel ori?ce and, consequently, the velocity of
at the other end, and a lateral intermediate pilot burner
the fuel jet will be reduced.
outlet 24. The hollow valve body is divided by partitions
It has been found that any substantial variation in
an intermediate chamber 23 from which fuel flows to the
pilot burner through the outlet 24, and a main outlet
chamber 30 from which fuel ?ows to the main burner
through the outlet 22. The inlet and intermediate cham
bers 26 and 28 are in communication through a port 32,
and the intermediate and outlet chambers 28 and ‘30 are
in communication through a port 34. The ports 32 and
soft and yellowish indicating insu?icient combustion air,
34 are provided with valve seats 36 and 38, respectively.
and when the point is reached wherein the velocity of
A pair of valves 40 and 42 are provided for cooperation
the air-fuel mixture falls below the rate of ?ame propa— 35
with the valve seats 36 and 38, respectively. The valves
gation, the ?ame will drop back and burning may oc~
40 and 42 are normally biased on their respective seats by
cur at the ori?ce. If, however, the fuel ?ow to the burn
springs 44 and 46, and are opened by solenoid actuators
er port is varied by varying the effective area of the re
48 and 50, respectively, when these actuators are ener
stricting ori?ce, the ?ame volume, and consequently
burner heat output, may be varied over a wide range with 40 gized. The solenoid actuators each comprise a winding,
'a central sleeve open at its lower end, ‘and a plunger ar
out these objectionable results.
ranged for reciprocation in the sleeve and having one of
The present invention has for an object the provision
the valves attached to its lower end. These elements of
of an automatic control system for gas-?red clothes dry
the solenoid actuators are respectively designated as 48a,
ers which operates the burner at full heat output capacity
i
until a predetermined temperature is reached and there 45 48b, and 480, and 50a, 50b, and 500.
The main burner .10 comprises an elongated mixing
after operates the burner at a reduced heat output rate.
tube 52 with an enlarged cylindrical chamber 54 at its
A further object is to provide a control for gas burn
base ‘which has an axial opening 56 for the introduction
ers wherein a fuel metering ori?ce at the base of the
of fuel and lateral ports 58 for admission of air. An ad
burner determines the heat output rate of the burner
and a temperature responsive valve spaced anteriorly of 50 justable sleeve 60‘ is provided for varying the area of air
ports 58. A short tube 62 is provided for conducting
the burner controls operation of the burner in an on and
fuel from fuel outlet 22 to the base of burner 10. The
off manner as ‘the temperature of the space being heated
tube 62 is in axial alignment with outlet 22 and is at
falls below or rises above a preselected temperature, and
tached at one end in any suitable manner to one side of
wherein additional means responsive to the temperature
of the space reduces the effective area of the fuel me~ 55 the valve body. The other end of tube 62 is necked
down and internally threaded to receive a threaded ori
tering ori?ce as the temperature of the space, when be
?ce plug 64 having ‘an ori?ce 64a. The necked down end
ing heated, approaches the preselected temperature.
of tube 62 and the ori?ce plug 64 enter the axial opening
A further object is the provision of an automatic con
56 and extend into the base portion 54 of the main
trol system for gas-?red clothes dryers in which a high
temperature thermostat operates the burner at a reduced 60 burner.
The valve body 18 is provided with an aperture 6-6 in
heat output rate and a low temperature thermostat in
the wall opposite to and in axial alignment with the out
creases the heat output rate of the burner, and in which
let 22. The aperture 66 is counterbored and threaded to
means is provided to maintain the higher heat output rate
receive in threaded engagement a solenoid actuator 68.
of the burner, once it is initiated, until the high tempera
ture thermostat responds to cut off operation of the 65 The actuator 68 is provided with the usual winding 68a,
of the burner ?ame. As the velocity of the fuel jet is
increased over the optimum for a given burner design,
the air-fuel mixture becomes leaner and the burning rate
slower until a point is reached ‘wherein the ?ame lifts
from the burner port. On the other hand, as the ve
locity is reduced below the optimum, the ?ame becomes
burner.
central guide sleeve 63b, and plunger 63c arranged to
reciprocate in the guide sleeve. Attached at one end
These and further objects and advantages will become
to the solenoid plunger 63c ‘and extending in axial align
apparent when reading the following description in con
ment therewith is a metering rod 70 which extends
nection with the accompanying drawings.
70 transversely through the valve body, through the tube 62,
In the drawings:
FIG. 1 is a plan view of a gas burner having associ
and into the ori?ce plug 64-. The ori?ce plug 64 has a
tapered bore '72, and one end of the rod 70 is provided
3,090,423
S
with a tapered point of which the included angle is
slightly less than the included angle of the tapered bore
72, The end of rod ‘79 is additionally provided with flat
surfaces 74, as indicated in FIGS. 4 and 5, so that when
the tapered end of rod 74} is seated at the intersection of
ori?ce 64a and tapered bore 72, there will be two passages,
one on each side of the rod 70. The ?at surfaces '74
diverge inwardly from the end of rod 7% at such angle as
to effect substantially the same percentage of ?ow re
from its de-energized position and thereby move the valve
from a closed to an open position,
When selector switch '96 is in high ?re position “H,”
solenoid actuator winding 50a is connected across the ter
minals 164-166 as follows: lead 110, switch :108, lead
112, switch blade ‘98, contact “H,” a lead 122, high tem
per-attire thermostat 84, a lead 124, a lead 126, winding
50a, a lead 128, a lead 130, ?ame sensitive switch 90
(when in hot, dotted line position), and lead 120‘.
When selector switch 96 is in low ?re position “L,”
duction through the ori?ce 6411 ‘when ori?ce plugs having 10 solenoid actuator winding 50a is connected across the ter
larger or smaller diameter ori?ces are substituted. ‘It is
minals 104—106 as follows: lead 110, switch 108, lead
necessary to vary the diameter of ori?ce 64a to com
112, switch blade 98, contact “L,” a lead 132, a lead 134,
pensate for fuels of different calori?c values, and the
‘low temperature thermostat 82, a lead 136, a lead 138,
{foregoing arrangement provides for maintaining the same
lead 126, winding 50a, lead 123, lead 130, ?ame sensitive
percentage of reduction in heat output of the burner for
fuels of different heat value as the rod 70 is moved from
its withdrawn position of FIG. 3 to its seating position
on line 5—-5 of H6. 4. The rod 70* is further provided
with a collar 76 at its other end, against which a spring
78 bears so as to bias the rod in a seated position when
switch 90‘ (when in hot, dotted line position), and lead
120.
When selector switch 96 is in automatic position “A,”
solenoid actuator winding 50:; is connected across the
power source terminals 104-106 in the same manner as
when selector switch 96 is in high ?re position “H,” due
the solenoid 68 is tie-energized. When solenoid 68 is
to the provision of a lead 140 which connects selector
energized, the rod 79 is retracted from the ori?ce plug,
switch contact “A” of the lefthand switch section to the
thereby to permit the maximum passage of fuel through
lead 122.
'
the straight bore portion of the ori?ce.
When selector switch 96 is in high ?re position “H,” the
Having described the fuel control valves and fuel me 25
metering pin actuator winding 68a is connected across the
tering device, the arrangement and operation of the en
terminals 104-406 as follows: lead 110, switch 108, lead
tire control system as diagrammatically illustrated in FIG.
112, a lead 142, switch blade 100, a lead 144, winding
6 will now be described. In addition to the main and
68a, lead 130, ?ame sensitive switch 90 (when in a hot,
pilot burners 10 and 14, respectively, and the dual valve
dotted line position), and lead 120.
and metering device 12, the system further includes as
When selector switch 96 is in a low ?re position “L,”
primary elements a low-temperature space thermostat
the just described circuit for the metering pin actuator
82 which opens on a rise in temperature a high-tempera
winding 68a is broken by movement of selector switch
ture space thermostat 84 which opens on a rise in tem
blade 160 to “L” position.
perature an electrical resistance igniter coil 36, an igniter
When selector switch 96 is in automatic position “A,"
- transformer 88, a ?ame sensitive switch 90‘ sensitive .to
the metering pin actuator winding 68a is connected across
?ame at the pilot burner, current reducing resistors 92
terminals 104—106 as follows: lead 110, switch 108, lead
and 94, and a three-position manual selector switch 96
112, blade 98 and contact “A” of switch 96, lead 140,
comprises a rotatable switch generally indicated at 96.
lead 122, high temperature thermostat 84, lead 124, lead
The switch blades 98 and 100, both ?xed on a rotatable
shaft 102, and therefore they rotate in unison as the 40 138, lead 136, low temperature thermostat 82, lead
134, lead 132, lead 146, contact “A,” blade 100, lead 144,
shaft 102 is manually rotated. The three positions of
winding ‘68a, lead 130, ?ame sensitive switch 90 (when in
switch 96 are indicated as “H” for high ?re, “L” for low
a hot, dotted line position), and lead 120'. Metering pin
?re, and “A” for automatic operation, or more speci?
actuator winding 68a is also connected across the power
cally, for an automatic sequence of operation in which
the burner initially operates at high ?re and continues to 45 source when in “A” position through a resistor 94, which
is connected in parallel with the low-temperature thermo
operate in this manner, regardless of the response of low
stat 82. The resistance of winding 94 is such as to pro
temperature thermostat 82, until the space being heated
vide su?icient energization of winding 68a to hold in the
has attained a predetermined temperature, and thereafter
metering pin 70 in‘ a retracted position once it has been
operates in an on-and-oif manner at low ?re under control
moved there, but is insu?icient to retract the pin from its
of the high temperature thermostat to maintain this tem
normally biased position in the ori?ce 64.
perature. This method of burner operation is particu
The igniter transformer 88 is connected across terminals
larly useful in a clothes dryer wherein it is desirable to
104—106 as follows: lead 110, switch 108, lead 112, lead
heat the load from ‘room temperature to a predetermined
148, the transformer primary winding 88a, lead 150, ?ame
drying temperature as quickly as practical, whereafter
sensitive switch 90 (when in a cold, solid line position),
the heating load diminishes as the moisture evaporates
from the :wet clothes and the drying temperature can
and the lead 120.
Operation
readily be maintained on low ?re.
Terminals 104 and 106 are provided for, connection
When it is desired to operate the burner at high fire,
to a power source such as 110 volt, 60 cycle, A.C., and 60 the selector switch 96 is rotated to position “H.” Upon
a line switch 108 is provided for primary control of the
closure of line switch 108, the solenoid winding 48a will
circuits which energize the electrically operated com
be energized through the cold side contact of ?ame sensi
tive switch 90. This will effect opening of the valve 48
ponents. The winding 43a of solenoid actuator 48 is
and admit fuel through outlet 24 to pilot burner 14. At
connected across the terminals 1ti4—'106 as follows: a
lead 110, line switch 108, a lead :112, a lead 114, Winding 65 the same time, igniter transformer primary 88a will be
energized through the described circuit, which includes
48a, a lead 116, a lead 1118, the ?ame sensitive switch 90
switch 90 in a cold position, and will effect ignition of
(when in the cold, solid line position shown), and a lead
fuel issuing from the pilot burner. When ?ame sensitive
120. When ?ame sensitive switch 90 moves to its hot
switch 90 responds to the presence of ?ame at pilot burner
dotted line position in response to the presence of a pilot
14, it moves from its cold, solid line position to its hot,
70
?ame, a partial energization of winding 48a is maintained
dotted line position thereby breaking the igniter circuit at
through the resistor 92, which is connected in parallel
lead 150 and the circuit for solenoid winding 48a at lead
with the cold side contacts of switch 90. This amount
118. Valve 40 will remain open, however, to supply fuel
of energization is suf?cient to hold the valve 40 in an
to the pilot burner due to the described shunt resistor 92.
open position once the solenoid plunger is in an attracted
The movement of switch 90 to its dotted line position
position, but is insu?icient'to attract the solenoid plunger 75
"3,090,423
completes the described circuit for the solenoid winding
50a extending through selector switch blade and contact
“H,” and through the high temperature thermostat 84.
tions, said ?rst valve having a normally fully closed po
The main burner will now continue to operate at full out
put under the on and off control of high-temperature
and when in said partially closed position being effective
thermostat 84.
sition when de-energized and said second valve having a
normally partially closed position when de-energized,
to restrict the ?ow of fuel to the burner, a source of
power, an energizing circuit for said valves including a
If for any reason the electrical power source is inter
?rst, high-temperature thermostat responsive to a drop in
rupted during operation of the main burner, both valves
the temperature of the space being heated below a ?rst,
40 and 42 will close immediately, thereby extinguishing
point to close and complete the energiza
both pilot and main burner. Even though the power in 10 predetermined
tion
and
effect
the opening of said ?rst valve and a sec
terruption be only momentary with a full restoration of
ond, low-temperature thermostat responsive to a drop in
power in a matter of a few seconds, and before the ?ame
sensitive switch 90 has had time to respond to the no-?ame
the temperature of the space being heated below a sec
ond, lower, predetermined point to close and complete
condition to break the energizing circuit for main burner
the energization and opening of said second valve but
valve winding 50a, fuel will not again be permitted to ?ow 15 only
if said ?rst, high-temperature thermostat is closed,
to the main burner, or the pilot burner for that matter,
the circuit arrangement being such that said ?rst valve is
until the ?ame sensitive switch 90 has had time to move
‘connected across the source of power through said ?rst,
to its cold, solid line position in which energization of the
high temperature thermostat and said second valve is con
igniter 88 is again completed. This power failure, safety
nected across the source of power through said ?rst and
feature is set forth in more detail in the application of 20
second thermostats in series, and a current limiting con
ductor connected across said second, low-temperature
Claude M. Garner, Serial No. 648,174 ?led March 25,
1957, now abandoned for “Burner Control System.”
When it is desired to operate the burner at low ?re,
the selector switch 96 is rotated to position “L.” This
thermostat, said current limiting conductor having such
resistance value as to permit sui?cient energization of
said second electromagnetically operated valve when said
action breaks the energizing circuit for the metering pin 25 second
thermostat is open to hold said valve open once
it is open, While, on the other hand, restricting energi—
and permits metering pin 70 to be seated in the ori?ce
zation suf?ciently when said second thermostat is open
plug v64, thereby reducing the ?ow of fuel to the main
to prevent actuation of said second valve from its nor
burner. At the same time, switch blade 98 is moved to
mal partially closed position to its fully open position,
position “L” so as to connect the main burner valve wind 30 whereby when the space is being heated from a cold con
ing 50a through the low temperature thermostat 82 via
dition the maximum ?ow of fuel to the burner will per~
actuator winding 68a at switch blade 100 and contact “ ”
lead 132. The burner will now continue to operate in an
on and olf manner at a reduced heat output rate under
sist until the space temperature has reached the point
wherein said ?rst, high-temperature thermos-tat opens,
control of the low~temperature thermostat 82.
even though said second, low-temperature thermostat has
When it is desired to initially operate the burner at high 35 previously opened at a lower space temperature.
?re when the heating load is heavy and then automatical
2. In a control system for clothes dryers operable
ly e?’ect a reduction in heat output rate when a desired
automatically to supply heat at a high rate to the dryer
temperature is reached, the selector switch 96 is moved
until a predetermined dryer temperature is reached and
to position “A.” When the selector switch is in this posi
thereafter to supply heat in an on-and-off manner at a
tion, main burner valve winding 50a is connected through 40 lower rate, an electrically operated heat producer oper
the high temperature thermostat ‘84 via switch blade 98,
able at a high heat output rate and at a low heat output
contact “A” and the lead 140, and metering pin actuator
rate, a high temperature open-on-rise thermostat which
winding 68a is connected through the high-temperature
thermostat 84, the low-temperature thermostat \82, and the
when closed effects operation of the heat producer at a
low heat output rate, a low temperature open-on-rise
parallel resistor 94. When operation of the burner is initi 45 thermostat which when closed increases the heat output
ated, the metering rod 70 is retracted and the burner oper
rate of the heat producer to its high heat output rate, and
ates at high ?re. When the temperature of the space to
holding means rendered operative upon closure of said
which the thermostats 82 and 84 are sensitive reaches the
high temperature thermostat and rendered inoperative
point wherein low-temperature thermostat 82 opens, the
only upon the opening of said high temperature thermo
electrical current through winding 68a will be limited by 50 stat to maintain operation of said heat producer at a high
the resistor 94. The value of resistor 94 is such as to
permit suf?cient energization of winding 68a to hold the
metering rod 70 retracted, but not su?icient energization to
heat output rate once such rate of operation is initiated
by the closing of said low temperature thermostat.
3. In a control system for clothes dryers operable au
effect its withdrawal from a seated position in ori?ce 64.
tomatically to supply heat at a high rate to the dryer un
The burner will therefore continue to operate in an on and 55 til a predetermined dryer temperature is reached and
off manner under control of thermostat 84 at a high heat
thereafter to supply heat in an on-and-olf manner at a
output rate until a higher space temperature is reached at
lower rate, an electrically controlled heat producer oper
the high-temperature thermostat 84 opens.
able at a high heat output rate and at a low heat output
When high-temperature thermostat 84 opens, the circuit
rate, a high temperature open-on-rise thermostat and a
therethrough for energization of winding '68:: is broken 60 low temperature open-on-rise thermostat, said thermostats
and pin 70 drops into its seat in ori?ce 64, so that when
the thermostat 84 again closes, the burner will be operated
at a low heat output rate. If, however, the heating load
again increases to the point wherein the space temperature
being responsive to a space being heated by the heat pro
ducer, a ?rst circuit completed through said high tem
perature thermostat for effecting operation of said heat
producer at a low heat output rate, means including an
drops under the low heat output to a point wherein the 65 electromagnetically operated device which when ener
low-temperature thermostat 82 again closes, the circuit
gized increases the output rate of said heat producer to
for winding 68a will again be completed and the burner
a high heat output rate, a branched circuit under the
will again operate at a high heat output rate.
control of said high temperature thermostat and com
We claim:
pleted through said low temperature thermostat for ener
1. In a burner control system, a burner, a fuel supply 70 gizing said electromagnetic device, and a holding circuit
conduit to said burner, ?rst and second electromagneti
cally operated valves in said supply conduit arranged in
series, said ?rst valve being operative between fully open
and fully closed positions and said second valve being
operative between fully open and partially closed posi 75
shunting said low temperature ‘thermostat, said holding
circuit including impedance of such value as to reduce
the magnetomotive force developed by said electromag
netic device to a value which is sui?cient to hold said
electromagnetic device in an energized position once it
3,090,423
7
has been moved there but is insufficient to operate said
device from its rile-energized to energized position, where
by operation of said heat producer at a high heat output
rate is maintained once it is established until said high
temperature thermostatropens irrespective of the position
of said low temperature thermostat.
4. In a burner control system for clothes dryers op
erable automatically to supply heat at a high rate to the
dryer until a predetermined dryer temperature is reached
8
lower, predetermined point to e?ect the energization and
opening oi said second valve, and holding means rendered
operative when said high temperature thermostat is in
a closed position for holding said second valve open once
it has been opened, whereby said burner is operated
constantly at a high heat output rate irrespective of the
position of said low temperature thermostat until the
temperature of the space being heated attains said ?rst
predetermined temperature and said high temperature
and thereafter to supply heat in an on-and-otf manner 10 thermostat opens.
References Cited in the ?le of this patent
at a lower rate, a burner, a fuel supply conduit to said
burner, ?rst and second electromagnetically operated
valves in said supply conduit arranged in series, said ?rst
valve being operative between fully open and fully closed
positions and said second valve being operative between 15
fully open and partially closed positions, said ?rst valve
having a normally fully closed position when tie-energized
and said second valve having a normally partially closed
position when de-energized, and when in said partially
UNITED STATES PATENTS
742,990
1,602,206
Humphrey __..,__, ______ __ Nov. 3, 1903
Possons _____ ___________ __ Oct. 5, 1926
1,819,560
Klees _______________ __ Aug. 18, 1931
2,109,862
Kriechbaurn ____ __, ____ __ Mar. 1, 1938
2,164,511
Furlong ______________ __ July 4, 1939
2,223,283
Grant et al. __ ________ __ Nov. 26, 1940
McCorkle _ _____ _,,______ Dec. 16, 1941
closed position being effective to restrict the ?ow of fuel 20 2,266,563
2,286,296
to the burner, a ?rst, high temperature thermostat re
2,494,737
sponsive to a drop in the temperature of a space being
2,820,130
heated below a ?rst, predetermined point to e?ect ener
2,824,605
gization and opening of said ?rst valve and a second,
low temperature thermostat responsive to a drop in the 25 2,884,009
2,978,228
temperature of the space being heated below a second,
'
McGrath 2,. __________ __ June 16, 1942
Borst __________ ______.__ Jan. 17, 1950
Dodson __,_‘_,___,_' _______ .Jan. 14, 1958
Dolby _.,___,____ ________ __ Feb. 25, 1958
Hetherington 1, _______ __ Apr. 28, 1959
Carlson ___.. __________ __ Apr. 4, 1961
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