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Патент USA US2119503

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.'May 31, 1938.
r
'v _J. P. KRIECHBAUM
2,119,503
FLUID FUEL BURNER CONTROL
Filed, Jan. ‘23, i936
Y W
~ 2,119,503
Patented May 31, 1938 '
‘UNITED s'rATss PATENT - 0mm ',
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‘2,119.50:
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mmf$h?;m§$
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or to MinneapolivHoneyweli Regulator Com
pany, Minneapolis, Minn” a corporation of Del
aware
Application January ‘23, .1938, Serial No. 60,481
8 Claims.‘ (01. iss-zs)
'
My invention relates to a ?uid fuel burner
Otherobjects
a consideration
of theofinvention
the accompanying
will be apparent
speci
control and more particularly to a control for ' upon
a gas burner employing the pilot burner to ig
?cation, claims, and drawing.
_
.
.
_
. nite the same, which pilot burner is lighted only
In the single ?gure of the drawing, I have
5 when the burner vis to be put into operationland shown a preferred form of my invention in‘ a
during such operation.
'
more or less schematic manner. Referring. to
In certain types of gas burner control systems
ity is the practice to provide means’ for igniting
the pilot burner each time that it is desired to
10 place the main burner into operation. In such
systems, a valve is usually provided for con"
said ?gure, a; main gas burner is designated by
the numeral I0 and a pilot burner by the nu
meral i I. The main burner is connected through»
a. pipe l2 and a main valve It with a gas supply
pipe ll. Connected to the gas supply pipe on
the inlet side of valve i3 is a pipe l5 which sup
trolling the supply of gas to the ,pilot‘burner and
‘some means‘ is provided- for igniting the gas
supply to the pilot burner.
plies fuel to the pilot burner ll under control of
In addition, it is
' _a pilot valve ll.
15 customary as a safety measure to provide. a ther
mostatic device responsive to the presence of a
is a safety pilot thermostat "II. This safety pilot
thermostat may be‘ of any conventional form
?ame at the pilot burner, commonly known as
> a "safety pilot thermostat". This device is em
wherein switch means are provided so that when
the pilot is cold one set of contacts are in en-' .
gagement and when the pilot is hot another set 20
ployed to‘ prevent the main gas valve being
20 opened until the- pilot burner has been lighted.
’ Arrangements, have also been provided, which
is engaged.
utilize the safety pilot thermostat to place the
25
_
,
30
35
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Located in proximity to the pilot burner ll
In the schematic showing of the
safety pilot. thermostat in thedrawin'g‘, the tem-‘
ignition means out ‘of operation ‘after the pilot‘ perature sensitive element which is shownas a '
‘has been lighted.
‘ bimetallic element is indicated by referencenum
,The prior systems of . this type have all hadv ber ID. This bimetallic element is adapted to be 25
certain de?nite disadvantages. In one such sys
engaged with either of two contacts, “and II.
tem the main valve is controlled only by the when the pilot ‘burner is not lighted and the
safety pilot thermostat'and is not under the con-1 safety pilot thermostat is cold,- as indicated'in
trol of ‘the room thermostat.’- If for any reason, the drawing, the bimetallic element It is in
the pilot valve is stuck in an open position, there engagement with the contactv 20, which contact 30
is‘ a possibility in_ this system of a dangerous maybe referred ‘to as the "cold contact”.- When
condition being created by reason-of the con‘ the pilot burner is lighted, "thebimetallic ele-' "
tinued operation of the main-burner after the vment is de?ected to the left so as ,to be in en
thermostat ceasesto call for heat.v Another type gagement with the contact 2i, which contact
of system overcomes the disadvantage just men
may be referred to as the “hot contact”. _. l
as"
tioned by employing a’ relay which adds to vthe
_ Located in proximity to the pilot burner II are
expense and complication of the system.v '
two electrodes 24. which are spaced apart to An object of the'present‘ invention is to pro
providev a spark gap therebetween. ' These elec- '
vide a system of a similar type just, discussed , trodes are connected to the opposite terminals of
40 wherein the main valve is under control or, both a secondary 25 of a step-up spark transformer. 40
the thermostat and the safety pilot and wherein - 20. - The transformer‘ 28 has in- addition to the
the use of a relay is eliminated by the utiliza
high ~voltage secondary 28, a low voltage prl- . -
215
tion ofv a switch operated by the operating means -
mary 21.
for the pilot valve.
.A step-down transformer ll supplies ppwer for > i
the operation of my
This transformer 45 ~
comprisesa line voltage primary 3! and slow . ‘I
.,
-
Afurth'er- object of this invention is to pro
vide a control system employing .a plurality of
valves in which a‘ switch- actuated in connection
with the op'ening‘of one of the ‘valves controls;
I
voltage secondary I I .
The ,primary 3. is con-_
nected to line wires 32 and 38.
> ‘
.in conjunction with a thermostatic switch, the
‘ vllly'lystem
The thermostat‘
is designated
controlling
.by the'refer'ence
the operationnu
‘M
'50 action of the other valve.
A further object ‘or the present invention is moral ‘ll. This-thermostat may take any con 50
to provide a burner control system in which the _ ventional form and-may be responsive to any
circuit to the ignition means'for the burner is controlling'condition. In the present case, ‘Qtlfe‘i
, . controlled by a switch which'is closed upon open
.66
movement of the burner valve. -
Y Y
_ I i
.
thermostat is intended to be a mom thermostat
' ‘which co'niprisesa bimetallic element 38 to which up , "
9,119,008
is attached a contact arm 88 adapted to be moved
gagement will not cause the establishment of
will bewnoted that the contact arm 88 is less
tinues to drop, however, the contact arm 88 will
into engagement with contacts 81 and 88. It any energizing‘ circuit. ‘If the temperature con
be )moved into engagement with bothcontacts 81
38. Thus upon movement of the contact arm 88‘ and '88, causing the following energizing circuit
to be established: from the right hand .terminal
_widely spacedfrom contact 81, than from contact
in the direction of contacts 81 and 88-, the con
tact arm is ?rst moved into engagement with‘
contact 81' and after a. predetermined tempera
ture change into engagement also with contact
of secondary 8i through conductors 82 and 83,
contact 88, contact arm 88, contact 81, conductor
84, solenoid winding 85 andconductors 88, 88 and
81 to the left 'hand terminal of secondary 8|. 10
10 88. As indicated by a legend on the drawing, a
bimetallic element 35 is so arranged that con- ' This causes the energization of solenoid winding
tact arm 88 is moved'in the direction of con
tacts 81 ‘and 38 upon a decrease in'the tem
perature.
15
58 with the result that switch blade 58 is moved
, into engagement with contact 88 and the valve
-
The main gas valve I8 may be of any type
I8 is opened to admit ‘gas to the pilot. At the
same time the following circuit is’ established
employing electrically actuated means for open-‘ through the primary 21 of the spark transformer
in; the valve. For purposes of illustration, I have 28: from the right hand terminalof secondary
shown an actuating means/10f the “stalled motor" ‘3i, through conductors 82 ‘and 88, contact 88,
type, wherein the valve is opened by a_ motor contact arm 88, bimetallic element 85, conductor 20
88,conductor 88,bimetallic element I8,contact 28,
20 against the action of a ‘spring which tends to
move a valve to a closed position and which, upon conductor 18, primary 21, and conductors 1i, 88,
deenergization of the motor. so moves the valve. and 81 to the left hand terminal of secondary ii.
The moving of switch blade 88 into engagement
The motor of this actuating means is designated
by the reference numeral '48 and comprises a with contact 88 as the result of energlzation of 25
solenoid winding 58 causes the following holding
25 rotor 4i and held winding 42. The rotor 4i is circuit to be establishedto. the solenoid winding:
connected through a suitable reduction gearing
from the right hand terminal of secondary 8|
43 with a gear 44. Secured- to this gear 44 is
a pin 45, which pin is adapted to engage with through conductors 82 and 12. contact 88, switch
the curved-portion of a hook 41. The hook _41 is blade 58,‘ conductors 18 and 88, bimetallic ele 30
ment 85, contact arm 88, contact 81, conductor
30 pivotally connected to a lever 48, which in turn,
is connected to a valve stem 48 of the valve ii. A 84, solenoid winding 58, and conductors 85, 88
valve stem 48 is connected to a valve disk 88 and 81 to the left hand terminal of secondary 8|.
which is biased to a closed position by a spring At the same time, a holding circuit is established
5|. Upon energiz'ation of the motor, the gear 44 through the primary of spark transformer 21 as 35 t.
‘is rotated in the direction of the arrowv shown follows: from the‘ right hand terminal of sec
thereon causing the pin 45 to engage the hook 41 ’ ondary 8|, through conductors 82 and 12, contact
and to raise the lever 48 and accordingly the valve
58. A pin 52 is secured to any suitable support
and limits the upward movement of lever 48 and
consequently of the valve 88. Upon deenergiza
tion of the motor, the spring is e?ective to move
the valve downwardly, moving therewith the gear
train 48 and the motor 48 and returning them to
the position shown in the drawing. '
Although the pilot valve may be in the form oi.’
any power actuated valve with provision for a
switch actuated upon the energlzation of the
valve actuating means, I have shown for pur
88, switch blade 88, conductors 18 and 88, bi
metallic element I8, contact 28, conductor 18, pri
mary 21, and conductors 1i, 88 and 81 to the‘
left hand terminal of secondary 8i.v The result 40
of the establishment of these two holding circuits
is that the solenoid valve will remain open ‘and
the spark transformer will remain energized ‘even
though contact arm 88 should move away from
contact "as might occur because of some slight
vibration or very slight temperature ?uctuation.
,In this manner sudden starting and stopping of
the apparatus is avoided.
_
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poses of illustration, a solenoid valve-having a
The result of the opening of the pilot valve I8
energization of the solenoid. ' This valve may con-
is that the two conditions necessary for ignition
50
switch which is moved to closed position upon ' and the energization of the sparktransformer 28
veniently be of the form of the valve disclosed in
‘the co-pending application of Willis H. Gille,
Serial Number‘ 39,781, ?led September 9, 1935L
I have shown this valve schematically as com prising a valve body 54 on which is mounted a
_ solenoid coil 58, with which is associated a core
58 ‘of magnetic material. The core is attached to
a valve disk 81 so that upon energization of the
solenoid coil 55 with the resulting upward move
:ment of the core 58, the‘valve 'disk 51 is moved
into open position. Also associated with the
solenoid 88 is a switch comprising a. switch blade
88 to which is secured an armature member 88.
85 Upon energization of the solenoid, the armature
' member 58 and accordingly the switch blade 58
is moved downwardly, to. cause engagement of the
switch blade with a stationary contact 88.
The various members are shown in the drawing .
.in1 the position they assume when the tempera
ture in the space to be heated is at or above the
' _: desired value. Upon the temperature dropping
below this value, the contact arm,“ is moved in
the direction of contacts 81 and 88. The contact
arm 88 will first engage contact 81 but $1118 en
of the pilot burner ‘have been established. If the
apparatus is functioning properly, the gas sup
ply to the pilot burner II by reason of the valve
I8 being open will be ignited by a spark appearing 55
across the electrodes 24 by reason of the energi
zation of the spark transformer 28.‘, After the
pilot burner is lighted, the bimetallicvelement I8
of thesafety pilot thermostat I! will soon be
come heated with the result that the element I8
is moved out of engagement with the cold contact
28 and into engagement withthe hot contact 21.
The moving of the bimetallic eleinent I8 out of
engagement with contact 28 results in the circuit
through primary 21 and the ignition transformer _' 65
--being broken. This causes the deener'gization of
the ignition transformer, the operation of which is
no longer needed by reason of the pilot burner
being lighted.
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The, moving bf the bimetallic element "into
70
engagement with the hot contact 2i results in
the following circuit’ being established through
'?eld winding 4.2 of the motor 48 which aetuates
the main .gas valve:" from theright hand termi
nal of secondary 8i through conductors 82 and 75
8 .
2,119,503
12, contact 60', switbh blade 58, conductors ‘l3 ' contacts of said ‘condition responsive switch for
connecting said'motor associated with said switch
‘ and 8'9, bimetallic element I 9, contact 2|, conduc
tor 15, motor ?eld winding 42, and conductor 61
to the left hand terminal of secondary 3|. This
results in the energization of the motor 40 caus
ing the same to rotate the gear 44 in the‘ direc
with said source of energy, holding circuit means
for said motor independent of said pair of con
tacts and controlled by said ?rst named switch,
and energizing circuit means for the other of
tion of the arrow thereon and hence causing the . said motors including and controlled by said ?rst
opening of the main gas valve l3 as previously
explained. ' The opening of the main gas valve
10 permits gas to ?ow to the main burner l0 where
named
switch.
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3. In combination, a plurality of valves, an
electric motor for each of said valves, a switch
associated with one of said motors, said motor
it is ignited by the pilot burner. The main burner
will then continue in operation until the tem
being operative when energized to move its as
perature in the room or in the space to be heated
sociated valve from a ?rst to a second control
has risen su?lciently that contact arm 36 is sepa
15 rated from contact 31 causing the deenergiza
tion of the entire system 'and restoring the parts
to the positions shown in theldrawing.
'
It will be noted that the ?eld winding 42 of
the motor operating the main gas valve is-under
_20 control of both the safety pilot thermostat and
the room thermostat.
The control of the main
gas valve motor by the thermostat is effected
through switch 58 and. contact 60 which remain '_
closed only so long as the thermostat is calling
25 for heat. The moment that the contact arm 36
separates from contact 31, the solenoid winding
55 is deenergized permitting separation of switch
blade 58 from contact 60 thus interrupting the
circuit to the ?eld winding 32; It will further.
30 be noted that this control of the main gas valve
in addition to that by the safety pilot thermo
ling position and to simultaneously close said
switch, a switch responsive to a. condition and 15
having two sequentially engageable pairs of con
tacts, a source of energy, circuit means controlled
by both pairs of contacts of said condition re- .
sponsive switch for connecting said‘ motor as
sociated with said switch with said source of en' 20
ergy, holding circuit means for said motor inde
pendent of the last to be engaged of said pairs
of contacts and controlled by ‘said ?rst named
switch, and energizing circuit means for the
other of said motors including and'controlled by 25
said ?rst named switch.
-
4. In a ?uid fuel burner control system, a pilot
burner, a main burner, a pilot burner valve, a
main burner valve, an electric motor for operat
ing each of said valves, a switch associated with
30 ..
the pilot valve motor, said motor being operative
upon energization thereof to‘ open said pilot valve
and close said switch,_a switch responsive to a
controlling condition and comprising a pair of
contacts which at a predetermined value of said 35
tion means and also to control the main valve _ condition are moved into unstable engagement
with each other, a source of energy, circuit 'means
motor. In this manner, I have obtained a rela
tivelysimple and inexpensive control system‘ in controlled by said ‘pair of contacts of said con
which a minimum of parts are employed but in dition responsive switch for connecting said pilot
valve motor with said source of energy, holding 40
40 which absolute safety in the event of any con
circuit means for ‘said motor independent of said
tingencies is assured.
_
'
While I have shown a speci?c embodiment of pair of contacts and controlled by said ?rst
my invention, it is to be understood thatv this is named switch, and energizing circuit means for
said main valve motor including and controlled
for purposes of illustration only and that my in
stat is eilected without the use of an‘additional
relay. It will further'be noted that the switch
blade 58 and contact 60 function both to con
trol a holding circuit for the solenoid and igni
vention is to be limited only by the scope of the
bysaid ?rst named switch.
appended claims.
5. In a ?uid fuel burner control system, a pilot
burner, a main burner, a pilot burner valve, a
main burner valve, an electric motor for operat
ing.each of said valves, a switch associated with
'
I claim as my invention:
‘ 1. In a ?uid fuel burner control system,_a pilot
burner, a main burner, a pilot burner valve, a
50 main burner valve, an electric motor for operat
ing each of said valves, a‘ switch associated with
the pilot valve motor, said motor being operative
upon energization thereof to open said pilot valve
and close said switch, ‘a switch responsive to a
55
controlling condition, electrically operated igni
tion means for said pilot burner, a source of elec
trical energy, circuit means effective upon closure
of said condition responsive switch to simulta
neously connect said pilot valve motor and said
ignition means with said source of energy, and
circuit means including and‘ controlled by said
switch associated with said pilot valve motor for
connecting said main valve motor with said
7
45
the pilot valve moto'r, said motor being operative 50
upon energization thereof to open said pilot valve
and close said switch, a switch responsive to a
controlling condition and comprising two sequen
tially engageable pairs of contacts, a source of
energy, circuit means controlled by both pairs
of contacts of saidycondition responsive switch
for connecting said pilot valve motor with said
source of energy, holding circuit means for said
motor independent of the last to be engaged of
said pairs of contacts and controlled by said
?rst named switch, and energizing circuit means
for said mainv valve motor including and con-v
trolled by said ?rst named switch.
6. .In a ?uid fuel burnercontrol system, a pilot
'
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2. In combination, a plurality of valves, an - burner, a main burner, ‘a pilot burner valve, a 65
source of .energy.
65
electric motor for each of said valves, a switch
associated with one of said motors, said motor
main burner valve, an electric motor for oper
ating each of said valves, a switch associated
being operative when energized to move itsas- ', with the pilot valve motor,- said motor being op
erativeupon energization thereof to open said
sociated valve from a ?rst to a second control
70 ling position and to simultaneously close said pilot valve and close said switch, a switch re 70
switch, a switch responsive to a condition and sponsive to a controlling condition and com
prising a’pair of contacts which at a predeter
having a pair of contacts which at a predeter
mined value of said condition are moved into un
stable engagement 'with each other, a source of
75 energy. circuit means controlled by said pair of
mined value of said condition are moved into un- .
stable engagement with each other, ‘a source‘ .01’
energy, circuit" means controlled by said‘ pair of 75
4
2,119,503
‘
contacts of said condition responsive switch for
connecting said pilot valve motor with said source
circuit means also including and controlled by
said ?rst named switch ‘for energizing "said fur--"
of energy, holding circuit means for said motor
independent of said pair of contacts and con
trolled by said-?rst named switch, means for
ther apparatus.
_ igniting said pilot burner, a temperature re—
sponsive switch adJacent to said pilot burner
‘ and moved to closed position when subjected to
the heat of the pilot ?ame, and energizing cir
~10 cuit means'for said main valve motor including
and controlled by said ?rst named switch and
by said‘temperature responsive switch.
7. In a temperature control system‘, apparatus
employing a ?uid, a valve controlling the ?ow of 7
15 said ?uid to said apparatus, an electrical motor
for operating said valve, a switch comprising a
single pair of contacts associated with said mo
tor, said motor being operative upon energize
. Jion thereof to movesaid valve from a ?rst to a
20 second controlling ‘position and to simultane
ously close the contacts of said switch, a-swltch
responsive to the temperature of a controlling
medium and having a' pair of contacts which at
a‘ predetermined value of said condition are
moved into unstable engagement with each other,
a source '0! energy, circuit means controlled by
said pair of contacts of said condition respon
;
8. In a temperature control system, apparatus
employing a ?uid, a'valve controlling the ?ow of
said ?uid to said apparatus, an electrical motor
for operating said valve, a switch comprising a
single pair of contacts associated withisaid mo
tor, said "motor being operative upon energiza
tion thereof to move said valve from a‘?rst‘ltora 10
second controlling position. and to simultane
ously close the contacts of said switch, a switch
responsive to the temperature of a controlling
medium and having a pair of contacts which ‘at
a predetermined value of said ‘condition ‘are 15
moved into unstable engagement with each
other, a source of energy., circuit means con
trolled by said-pair of contacts of said condition
responsive switch for connecting said motor. with
said source of energy, holding circuit means for
said motor independent of said pair of contacts
of said condition responsive switch and con
trolled by said ?rst named switch, a third switch,
and means responsive to a condition normally‘
established as a result of the movement 01’ said 25
valve to said second controlling position and
operative upon the establishment of \ said con
sive switch for connectingsaid motor with said - dition to move said third switch toclosed posi
source of energy, holding circuit means for said tion, further electrically operated apparatus
30 motor independent of said pair of contacts of ‘ whose operation prior to the establishment of
said condition responsive switch and including» said last named condition is‘v not desirable, and
and controlled bysaid ?rst named switch, tur ‘ circuit means including and controlled by said
?rst named switch and by said third vswitch for
' ther electrically operated apparatus whose oper
ation prior to the movement of said valve-to said energizing said additional apparatus.
JOHN P. .KRIECHBAUM.
85 second controlling position is not desirable, and
1
30'
35
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