close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3032108

код для вставки
May 1, 1962
J. E. WILDER
3,032,098
OIL BURNER CONTROL
Filed Dec. 12, 1958
13
/
J7 is
l
semi / '
7396791405747
(04/605 770/1/
I|
I
FfSRQ/VS/ l/f 7715911057217 l
747m,
6%,
m ilzzm
,li‘farrzggs.
United States Patent Office
1
2
oil valve 12, by means of a wire 23. A wire 24 connects
the'wire 22 and the wire 16, this connection being at a
3,032,098
Justin E. Wilder, Goshen, ImL, assignor to Penn Controls,
_
3,032,098
Patented May 1, 1962
OIL BURNER CONTROL
Inc, Goshen, Ind., a corporation of Indiana
Filed Dec. 12, 1958, Ser. No. 780,051
3 Claims. (Cl. 158-28)
point intermediate of the switch R1, and the burner and
ignition means. A wire 26 connects the wire 17, inter
Cl mediate the switch SS and the switch P3 ‘to one side of
the primary coil 27 of a step-down transformer 28, the
other side of the primary coil being connected to the lead
wire 14.
The secondary coil 29 of the transformer is connected
This invention relates generally to oil burner controls,
and particularly to constant ignition oil burner controls
adapted for controlling portable space heaters or the like. 10 by means of a wire 31 to one side of an electrical resist
In the curing of concrete in building structures it is con
. ance heater P, which when heated operates the switches
ventional to utilize portable oil burning space heaters
P1, P2 and P3, and thereby functions as a purge or warp
referred to as “salamanders.” These burners are required
switch heater. The other side of the heater P is connected
to operate for extended periods without attention, and in
by means of a wire 32 to one side of a closed hot combus
dust laden atmospheres. Control circuits utilized in con
tion responsive switch CH. The other side of the switch
trolling the operation of these salamander heaters must
CH is connected to one side of a closed cold combustion
meet several requirements among them provision for a
responsive switch CC. The switches CC and CH may be
purge or scavenger operation of the burner fan at the end
operated by means of a suitable linkage from a combus
of a burner on-period until the combustion chamber is
tion temperature responsive element, such as helical bi
cooled and purged of products of combustion. Further,
metal 30. The wire 32 further connects the other side of
the switches in the circuit and the controlling thermostat a the switch CC to one side of an electrical safety switch
should preferably be of the line voltage type so that their ' heater SSH, the safety switch heater being connected by
contacts will be less sensitive to accumulation of dust.
It is an object of the present invention to provide a
control circuit for oil ?red salamander type heaters in
means of a wire 33 to the other side of the transformer
secondary coil 29. A wire 34 connects an electromag
netic coil R to the wire 31, the other side of the relay coil
which the majority of the switch contacts in the circuit, . .
being connected by means of a wire 36 to an intermediate
including the thermostat contacts, are line voltage.
A further object of the present invention is to provide
a control circuit of the type referred to above, providing
tap 37 on the transformer secondary coil 29 through the
normally open relay switch R2. A wire 38 connects the
juncture of the relay coil R and the switch R2 to the com
a timed purge period in which the burner motor fan is 30 mon’sides of the switches CH and CC; '
maintained in operation subsequent to opening of the .
It will be understood that the warp switch assembly
thermostat contacts at the end of a burner on-cycle.
provided by the heater P, and the switches P1, P2 and P3
A further object of the present invention is to provide a
operated thereby, is of a conventional type, wherein the
control circuitfor oil ?red salamander type heaters utiliz
heater raises the temperature of a bimetal member con
ing a combustion responsive switching means which need
trolling the position of one of the contacts of each of the
not be snap-acting but may be of the walking contact type. ’ switches; The switches P2 and P3 are preferably operated
These and other objects will become apparent as the ' with a-snap-action, but need not-be of the overlapping
description proceeds with reference to the accompanying
drawing:.
.
v
.
.
,.
..
-
The figure shows an across the. line diagram of a
control circuit embodying the present invention.
Referring to the drawing, the circuit shown controls a “
conventional oil burner indicatedv schematically at 10, the
burner being provided with a fan which drives air through
type. The relay coil R operates switches Rland R2 and
moves them to closed position when energized.
The
safety switch assembly. comprising the heaterSSH and the
switch SS is of a conventional type wherein, uponthe
heater being energized for a pre-determined timerthe
switch SS is latched open by a latch L and is not reclosed
upon deenergization of the heater, but must be manually
the combustion chamber. The burner construction per se
forms no part of the present invention, and its structure is
therefore not shown in detail.
reclosed on reset.
Co-operating with the burner is a conventional ignition
means 11, which also is of conventional type and may in
clude an ignition transformer and spark electrodes. An
oil supply valve is indicated at 12, and this valve may take
the form of a normally closed, solenoid-operated valve
responds upon a rise in stack temperature at the burner
to operate the switch.
controlling the supply of oil to the burner 10, the solenoid
valve being of a conventional type.
The circuit for controlling these elements includes pow
er supply Wires 13 and 14, which may be connected to a
suitable line voltage source of electrical power. A wire
16 connects the burner and ignition means to the power
lead 13, and has interposed therein a relay switch R1. A
wire 17 connects the space temperature responsive ther
mostat 18 to the wire 13, and further connects the nor
mally closed contacts of a safety switch SS in series with
the thermostat. The wire 17 further connects in series
therewith the normally open contacts of a purge or warp
switch P3, and the solenoid actuator for the oil valve 12.
The oil valve, ignition means and burner are connected
to the lead wire 14 by means of a wire 19. A wire 21
connects one side of a normally open warp switch P1 to
the wire 13. A wire 22 electrically connects the other
side of the switch P1 to one side of a normally closed
warp switch P2. The other side of the switch P2 is con
nected to the wire 17 intermediate the switch P3, and the
The switches CH and C0 are of a
conventional type operated by a stack temperature respon
sive element, usually in the form of a bimetal helix, which
In operation, with the circuit components in their posi
tion shown in the drawing, the circuit to the transformer
28 is broken at the thermostat 18, and the relay coil R
is consequently in a de-energized state. Switch R1 is open
and the burner, ignition means and oil valve are conse
quently de-energized. Upon a call for heat evidenced by
closure of the thermostat 18, a circuit will be completed
to the primary coil 27 of the transformer 28, which may
be traced from the wire 13, through thermostat 18, switch
SS and wire 26. Completion of the circuit to the trans
former provides power to the relay coil R by a circuit
which may be traced from one side of a secondary coil
29, through wire 33, heater SSH, switch CC, wire 32, wire
38, wire 36, relay coil R, wire 34, and via. wire 31 back
to the secondary coil 29.
Energization of relay coil R closes the holding switch
R2 and also closes the burner controlling switch R1.
This energizes the burner and ignition means, and,
through wires 24, 22, switch P2 and wire 23, also opens
the oil valve 12. Ignition of the oil thereupon occurs,
raising the temperature of the heater stock. It will be
noted that upon closure of thermostat 18 and energiza
tion of transformer secondary coil 29, the heater SSH is
3,032,098
a
also energized and the purge heater P remains de-ener
gized since the circuit thereto is broken at switch CH.
Normally the safety switch assembly is adjusted so that
the heater SSH will open the switch SS approximately
heating an enclosure, said control circuit comprising a ?rst
line voltage network including a main burner switch con-'
trolling the application of line voltage to the burner motor‘,
one and one-half minutes after it is energized.
In a normal operating cycle, prior to the termination
of this one and one-half minute period, the switch CC
will be moved to open position. Response to an increase
ture responsive thermostaticrswitch, a normally closed
safety switch and primary coil of a stepdown transformer
all serially connected, a combustion responsive element,
a second line voltage network'including a space tempera
a ?rst switch actuated by said element which is closed in
in stack temperature will subsequently move the switch
the absence of combustion at said burner, a second switch
CH to closed position, energizing the purge heater P. A 10 actuated by said element which is closed in the presence
timed period after energization of this heater, the switches
of combustion at said burner, an electromagnetic operator
P1 and P3 will be closed and simultaneously the switch
for said main burner switch, a thermalelectric operator
P2 will be opened. Closure of switch P3 maintains the
for said safety switch, a warp switch heater, a low voltage
valve 12 open even though switch P2 is opened. Switches
circuit network including a starting circuit comprising said
P2 and P3 are operated simultaneously, with a snap H 01 safety switch operator, said ?rst switch actuated by said
element and said electromagnetic operator all serially con
action, but need not overlap since a momentary de-ener
gization of the actuator for valve 12 has no detrimental
effect on the burner operation.
When the thermostat 18 is satis?ed, its contacts will
open, closing the oil valve 12 and de-energizing the trans
former 28 and consequently relay coil R. This opens
switch R1, however, even though switch R1 is opened,
the burner motor fan will be maintained in operation
through a circuit which may be traced from wire 13,
through wire 21, switch P1 and wire 24. This purging
nected across the secondary coil of said transformer, a
holding circuit for said electromagnetic operator compris
ing a holding switch operated by said electromagnetic
operator connected in series with said electromagnetic
operator and a portion of said transformer secondary coil,
an energizing circuit for said warp switch heater comprise
ing said heater, said second switch actuated by said ele-'
ment and said holding switch all serially connected across
25 said portion of said transformer secondary coil,- an elec-’
operation of the burner motor will be maintained for a
trically operated ?uid fuel valve adapted when energized
period timed by the cooling of the heater P su?iciently
to permit the ?ow of fuel to said burner motor and to
stop the ?ow of fuel thereto when de-energized, a ?rst
to open switch P1.
Cooling of heater P also resets the
switches P2 and P3 to their original positions. With this
circuit for energizing said oil valve including a normally
cooling of heater P an operating cycle of the burner 30 closed warp switch adapted to be opened by said warp
is completed. When the temperature of the enclosure
switch heater and connecting said valve to said main
being heated again falls below the control point of the
burner switch, a second energizing circuit for said oil
thermostat, another burner cycle will be initiated.
In the event of ignition failure, that is, failure of the
valve including a normally open switch adapted to be
closed by said warp switch heater and connecting said
coil to ignite at the start of a burner on-period, the switch 35 valve operator in a circuit lead joining the switch and said
CC will remain closed and the heater SSH will open the
transformer primary coil, whereby upon closure of said
safety switch SS, shutting the oil valve 12 and de-energiz
space temperature responsive thermostatic switch said oil
ing transformer 28 and relay coil R to shut down the
valve is energized through said normally closed warp
burner motor and the ignition means. In the event of
switch and upon opening of said normally closed warp
?ame failure mid-way in the burner on-period, the switch 40 switch and closing of said normally open warp switch
CC will reclose energizing safety switch heater SSH to
by said warp switch heater said valve is energized through
subsequently open the safety switch SS to close oil
said normally open warp switch, and means for retaining
valve 12.
said burner motor in operation for a purge period sub
It should be noted that the arrangement whereby the
sequent to opening of said space temperature responsive
actuator for the oil valve 12 is energized at the start of 45 thermostatic switch, said last mentioned means compris
a burner on-period through switch R1 and is de-energized
ing a second normally open warp switch operated by said
immediately upon opening of the thermostat provides a
warp switch heater and connected in shunt around said
means whereby the energization and de-energization of
main burner switch.
2. A control circuit for an electric motor operated ?uid
the oil valve actuator is simultaneous with the closing and
opening of the thermostat if, and only if, the relay coil R 50 fuel burner adapted for heating an enclosure, said control
is energized. This provides a safety factor in that relay
circuit comprising a ?rst line voltage network including
R cannot be energized upon closing of the room thermo
a main burner switch controlling the application of line
stat unless the stack temperature responsive switch CC
voltage to the burner motor, a second line voltage net
work including a space temperature responsive thermo
has moved to its closed position after the termination of
the preceding burner on-period, thus giving an indication 55 static switch, a normally closed safety switch and primary
that the stack temperature responsive switch is in proper
coil of a step-down transformer all serially connected,
operating condition for the next burner on-period. The
a combustion responsive element, a ?rst switch actuated
by said element which is closed in the absence of com-v
arrangement is thus such that valve 12 cannot be opened
unless the burner motor 10 is also energized.
bustion at said burner, a second switch actuated by said
The circuit arrangement is such that the majority of the 60 element which is closed in the presence of combustion at
said burner, an electrical operator for said main burner
controlling switches, including the thermostat, are in the
line voltage portion of the circuit and are thus less suscep
switch, an electrical operator for said safety switch, a warp
tible to fouling by dust. The relay coil and heaters P and
switch heater, a low voltage circuit network including a
starting circuit comprising said safety switch operator,
SSH are low voltage components and thus are of less
costly construction.
said ?rst switch actuated by said element and said main
65
burner switch operator all serially connected across the
While the invention has been disclosed and described
in some detail in the drawings and foregoing description,
secondary coil of said transformer, a holding circuit for
they are to be considered as illustrative and not restrictive
said main burner switch operator comprising a holding
in character, as other modi?cations may readily suggest
switch operated by said main burner switch operator con
themselves to persons skilled in this art and within the 70 nected in series with said main burner switch operator and
broad scope of the invention, reference being had to the
a portion of said transformer secondary coil, an ener
appended claims.
gizing circuit for said warp switch heater comprising said
The invention claimed is:
heater, said second switch actuated by said element and
, l. A control circuit for an electric motor operated ?uid
said holding switch all serially connected across said por
fuel burner of the constant ignition type adapted for 75 tion of said transformer secondary coil, an electrically
3,032,098
6
operated ?uid fuel valve adapted when energized to per
a low voltage circuit network including a starting circuit
rnit the ?ow of fuel to said burner motor and to stop the
flow of fuel thereto when de-energized, a ?rst circuit for
energizing said oil valve including a normally closed
Warp switch adapted to be opened by said warp switch
heater and connecting said valve to said main burner
switch, a second energizing circuit for said oil valve in
cluding a normally open switch adapted to be closed by
said warp switch heater and connecting said valve opera
comprising said safety switch operator, said ?rst switch
actuated by said element and said electromagnetic opera
tor all serially connected across the secondary coil of said
transformer, a holding circuit for said electromagnetic
operator comprising a holding switch operated by said
electromagnetic operator connected in series with said
electromagnetic operator and a portion of said trans
former secondary coil, an energizing circuit for said warp
tor in a circuit lead joining the switch and said trans 10 switch heater comprising said heater, said second switch
former primary coil, whereby upon closure of said space
actuated by said element and said holding switch all
temperature responsive thermostatic switch said oil valve
serially connected across said portion of said transformer
is energized through said normally closed warp switch
secondary coil, an electrically operated ?uid fuel valve
and upon opening of said normally closed warp switch
adapted when energized to permit the ?ow of fuel to said
and closing of said normally open Warp switch by said 15 burner motor and to stop the ?ow of fuel thereto when
warp switch heater said valve is energized through said
tie-energized, a ?rst circuit for energizing said oil valve
normally open warp switch, and means for retaining said
including a normally closed warp switch adapted to be
burner motor in operation for a purge period subsequent
opened by said warp switch heater and connecting said
to opening of said space temperature responsive thermo
valve to said main burner switch, a second energizing cir
static switch, said last mentioned means comprising a
cuit for said oil valve including a normally open switch
second normally open warp switch operated by said warp
adapted to be closed by said warp switch heater and con
switch heater and connected in shunt around said main
necting said valve operator in a circuit lead joining the
burner switch.
switch and said transformer primary coil, whereby upon
3. A control circuit for an electric motor operated
closure of said space temperature responsive thermostat
?uid fuel burner of the constant ignition type adapted for 25 said oil valve is energized through said normally closed
heating an enclosure, said control circuit comprising a
warp switch and upon opening of said normally closed
?rst line voltage circuit network including a main burner
warp switch and closing of said normally open warp switch
switch controlling the application of line voltage to the
by said warp switch heater said valve is energized through
burner motor, a second line voltage network including a
said normally open warp switch, and switch means shunt
space temperature responsive thermostat, a normally 30 ing said main burner switch for retaining said burner
closed safety switch and primary coil of a step~down trans
motor in operation for a purge period subsequent to open
former all serially connected, a combustion responsive
ing of said space temperature responsive thermostat.
element, a ?rst switch actuated by said element which is
closed in the absence of combustion at said burner, 21 sec
References Cited in the ?le of this patent
ond switch actuated by said element which is closed in
UNITED STATES PATENTS
the presence of combustion at said burner, an electromag
1,732,174
Sweatt _______________ __ Oct. 15, 1929
netic operator for said main burner switch, a thermalelec
2,772,727
Schell ________________ __ Dec. 4, 1956
tric operator for said safety switch, a warp switch heater,
Документ
Категория
Без категории
Просмотров
0
Размер файла
534 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа