вход по аккаунту


Патент USA US2113001

код для вставки
Ap ° 5, 1938.
l.. l.. scoTT
Filed Nov. 18, 1935
2-snee1s~shee1~ 1
\\\\\\\ \
' April 5, 1938.>_~ l
L; ,_„ SCOTT
Filed Ndv. 1e, 1935
2 sheets-sneer 2
Patented Apr. 5, 1938
Lewis L. Scott, St. Louis, Mo.
Application November 18, 1935, Serial No. 50,284
8 Claims. (Cl. 158-99)
This invention relates to gas burners of a type
particularly adapted for household heating,_ al
though its utility is not limited to that use. v
An object of the invention is to provide a gas
5 burner with meansl for opening and closing a gas
supply line which is simple in construction, du
rable in service and economical in operation.
.Another object of the invention is to provide
a gas burner with valve mechanism for opening
and closing the supply line which will be so ar
ranged that the use of packing about the valve
is unnecessary. More specifically, an object is
to provide a valve having a stem opening into an
air conduit or chamber in such a fashion that any
small amount of gas leaking past the valve and
past its stem, due to irregularities of construction
or wear, ~will be discharged into the furnace where
it may be ignited by a pilot and thereby con
Another object of the invention is to provide
means simple in construction and durable in
service to simultaneously close a gas Valve, and
to close an air mixing valve, whereby air may
be prevented from entering the furnace when
25 the burner is out of operation,
Another object of the invention is to utilize
a motor which is provided for furnishing a forced
draft of air to the gas burner, also to open a gas
supply valve when the motor is placed in oper
In accordance with the preceding objects
30 ation.
vsuch a device may also be applied to simulta
neously open the air mixing valve if desired.
Thus, a single electric circuit supplying the motor
and controlled by a room thermostat, for in
stance, may fully control the operation of the
Other objects will be apparent from the fol
lowing descriptìon, taken in connection with the
accompanying drawings.
Fig. 1 is a vertical section showing an embodi
ment of my invention;
Fig. _2 is a bottom view;
Fig. 3> is a detail partly in section showing a
clutch which is a part of the embodiment; and
Fig. 4 is a‘circuit diagram.
A furnace or boiler I to be heated, which may
be of any selected construction, has an opening
2 in which the burner may be installed. The
burner includes a shell or casing 3 having an an
nular chamber or conduit 4 which communicates
through an extended portion 5 and a port 6
with valve housing l, connected to a gas supply
line 8. The casing 3 has an inner annular Wall
9 forming a cylindrical chamber or conduit with
a perforate bottom yWall I0, which supports a mo
tor II, having a shaft I2 extending through the
Wall and driving an air propeller I3 positioned in
side the cylindrical Wall or chamber 9.
The outer end of the motor shaft I2, through
60 a chain of reducing gearing, drives a shaft I4 at
a low` speed. An iron disc or armature I5 is fixed
to the shaft I4 and forms a part of a magnetic
clutch for opening and closing a poppet valve I6
in the port 6, and for shifting a perforate damper
plate I‘I, which is so arranged with respect to the
perforate plate I0 as to form an air mixing valve
or damper for the chamber 9.
The valve I6 seats in the port 6 and its stem
I8 extends through the annular wall 9 with its
outer end exposed for engagement by a lever I9.
The valve is closed and normally held in closed
position by an expansion spring 20.
The lever I9 is connected by a link 2I to the
damper plate I‘I and is connected by a link 22 to
a clutch stator 23, pivotally mounted on the shaft
I4 to cooperate with the clutch armature I5.
The stator 23 is energized by a coil 24 connected
by Wires 25 to a supply circuit 26 for the motor.
Hence, when the motor is not operating, the
spring 20 Will close the fuel valve I6, thus moving
the lever I9 to close the damper plate I'I. The
air chambers will be closed at the bottom and
any gas leaking through the valve and its stern
Will flow into the furnace. When current flows
through the circuit 26, responsive for instance to 25
the operation of a room thermostat 2l, the motor
and its blower I3 will start operation, and the
coil 24 will cause engagement of the magnetic
clutch to operate the lever I9 and thus open the
damper plate Il and the valve I6.
The foregoing is a short description of the em
bodiment of the invention specifically shown in
the drawings, while the essential features of the
invention are pointed out in the appended claims.
The following supplemental description of the
construction and operation of the embodiment
specifically illustrated will assist in understand
ing and practicing the invention.
The burner casing is provided with a burnerv
opening comprising an annular slot 30 through
the wall forming the annular chamber 4. A
mushroom deflector 3| is spaced from the top
Wall of the burner casing by means of legs 32.
Thus, air passing through the chamber or con
duit 9 is deflected toward the burner opening >
30. A pilot 33, as specifically shown, is fed by
gas from thechamber 1. The casing 3 is sup
ported in the opening 2 and above a floor upon
which the furnace may be placed by legs 34.
The damper, as previously described, includes
a fixed perforate plate I0, and a movable plate Il.
The plate I0 is held in position by a number
of screws 35, each engaging in the casing and hav
ing a shoulder portion adjacent the head, the
shoulder engaging the plate I0 and holding it ‘
securely in position while the head is spaced`
from the plate to provide a guide for the mov
able perforate plate Il. The motor II is sup
ported by bolts 36 to the plate I0, while the plate
I‘I has appropriate arcuate slots to accommodate
the supports. The extent of opening of the
damper plate I1 may be regulated by an adjust
able stop 31, having an abutment piece 38 for
engagement with a lug 39 secured to the plate
4l1. The stop 31 is held in position by a screw 40
on the casing 3 and passing through a slot 4I in
the stop member 31. Thus, the stop member 31
may be held in a number of positions depending
upon the setting of the screws 40 in the slot 4I.
The lever I9 includes an arm l2, which en
gages the end of the valve stem and an arm I3,
to which is attached links 2| and 22, the arms
being adjustably positioned on a shaft M which is
supported by a bracket 45 attached to the casing
15 3.‘ The levers are adjustable on the shaft M in
order to provide a proper valve clearance re
gardless of the adjustment of the stop 31 for the
leading from atmosphere to said opening, a valve
for opening and closing the port and having a
stem extending through a wall separating said
conduits, a damper for closing said air conduit,
ar blower in the air conduit, a motor for driving Ul
the blower, mechanism for operating the stem
and the damper, and a clutch for connecting the
motor and the mechanism arranged whereby the
motor upon starting will operate the mechanism
and upon stopping will release the mechanism; 10
2.v In a gas burner, a blower, a motor for oper
ating the blower, a gas supply valve, mechanism
for opening the valve, a magnetic clutch for con
necting when energized the motor and said
mechanism, a-common circuit for energizing _both
the motor and clutch, and resilient means for
closing the valve, whereby the valve will be opened
20 attached, is driven through reducing gearing, not
and held open upon operation of the blower and
closed when current is cut on.' from the motor.
3. In a gas burner, a motor, a gas supply valve, 20
shown, by the motor shaft I2. The details of
the gearing are not shown because it forms no
part of the present invention and its construc
tion, which may be varied, is well understood in
25 the art. It may be of the type commonly used
yielding means for normally holding the valve
closed, mechanism for opening the valve, and a
clutch device for connecting the motor and said
mechanism arranged whereby the motor upon
starting will operate the mechanism and upon 25
The shaft Il, to which the clutch disc I5 is
for driving oscillating mechanism in electric cir
culating fans, and rotates at substantially the
stopping will release the mechanism. 4. In a gas burner,-'a draft damper, a gas sup
same speed, that is to say, between 4 and 5
R. P. M. If the burner is to be used for heat
ply valve, a lever, an operating connection be
tween said lever and damper, an operating con
nection between the lever and the valve, ar
ing, the motor circuit will ordinarily be controlled
ranged whereby the lever will open the valve and
by a room' thermostat 21, shown diagrammati
damper, a blower, a motor for operating the
cally in Fig. 4. That is to say, when the tem
perature of the room falls below the temperature ' blower, mechanism for operating the lever, and a
for which the thermostat may be set, the motor clutch device for connecting the motor and said
35 circuit will be closed and the‘motor pnt inopera
tion. The operation of the motor rotates the
shaft I4 and since the coil 2l of the magnetic
clutch is connected to the motor circuit, mnve‘
ment of the disc I5 will tend to move the clutch
40 element 23 to rock the lever I9 and open the valve
I8 and _the damper plate I1. Rotation of the
disc 23 -`will continue until the damper plate I1
is opened and the lug- 33 engages the abutment
piece 33 on the stop member 31. Thereafter, dur
45 ing operation of the motor the clutch will slip but
hold the valve and damper open.
Upon a predetermined rise in temperature the
thermostatic switch ß will be opened, thus stop
ping the motor and releasing the clutch element
50 23. Thereupon the `expansion spring 20 will press
the valve I3 closed and move the lever 42, thus
closing the damper plate I1. Any gas which
might escape around the valve, due' to wear or
faulty workmanship, and from the chamber 5
55 around the valve stem into the chamber I will be
trapped by the shutter I1 and will now into the
furnace under the mushroom deilector 3| where
it may be ignited by the pilot 33. -Furthermore,
draft will be prevented from flowing through
the air-duct 3 and thus unnecessarily cooling the
mechanism arranged whereby the motor upon 35
starting will operate said mechanism and upon
stopping will releasesa'id mechanism.
5. Apparatus for operating aI supply valvel
comprising, yielding means for closing the valve,
mechanism for opening the valve, an electric 40
motor, a magnetic clutch adapted when ener
gized to connect the motor- and said mechanism,
and a common circuit to supplyl said motor and
to actuate said clutch.
6. Apparatus for operating a supply valve 45
comprising, yielding means for closing the valve,
mechanism for opening the valve, an electric
motor, a slip clutch adapted to connect the motor
and said mechanism, and arranged by slipping
to permit continuous operation of the motor dur 50
ing the period said valve is open and to permit the
yielding means to close said valve when the motor
is stopped.
7. Apparatus for operating a supply valve ccm
prising, an electric motor, reducing gearing oper
able bythe motor, mechanism for .opening the
valve, a slip-clutch associated with` said gearing
to actuate saidmechanism and adapted by slip
ping to permit continuous operation of the motor
while the valve is open, and means independent
of said gearing and motor .operable to close said
. .
From the foregoing it is obvious that the in
valve when the motor is stopped.
8. Apparatus for operating a supply valve coni'
vention accomplishes its purposes. i Parts of the
invention may be used without ~the whole and lprising, yielding means for closing the valve,
65 various changes may be made in the details of mechanism-for opening the valve. an electric
construction, vwithin“ the scope 4of the appended motor, reducing gearing operable by the motor.
claims, without departing from the spirit of this .a magnetic clutch adapted when energized to
connect the gearing and the mechanism for open
I claim:
ing the valve, and a common circuit to supply
1. A gas burner having a_ supply port, a gas , Said motor 8nd t0 actuate Said clutch.
conduit leading from the port to a burner open
ing, an air conduit adjacent said gas conduit
furnace when the burner is oiI.-
Без категории
Размер файла
394 Кб
Пожаловаться на содержимое документа