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Патент USA US2105626

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Jan. 18, 1938.
‘ 2,105,626
' Filed March 4, 1936
Patented Jan. ' 18, 1938
um'rao STATES '
Walter W. Williams, Bloomington, 111.
Application March 4, 1936, Serial No. 67,020
4 Claims. (Cl. 158-28)
vention as applied to a burner‘mechanism of the
type above described. The 'burner mechanism
This invention relates to improvements in ?uid
fuel burners, and more particularly to an im
illustrated includes a casing I "supported upon
proved means for controlling the ?ame at‘ initial
ignition in the forced vdraft type of burner.
In the forced draft type of ?uid fuel burner
mechanism for domestic heating purposes, the
legs 2 which in turn'support a fan blower hous
ing 3 mounting a blower for delivering air under 5
pressure through a draft pipe 4. The blower
driving shaft is driven by an electric motor, not
shown, and said shaft is extended to operate the
rotor 5 of a pressure pump within a housing 6
extending from the blower housing 3 and. a fluid 10
fuel metering pump 1 adapted to deliver ?uid
fuel to the interior of said pressure pump. The
pressure pump is provided‘ with an air intake
‘8 and delivers the air received therefrom and 15
the fuel from the metering pump under pressure
through pipe 9 to_ the interior of the closed cham
ber l0 formed by the casing ll supported upon
full forces of the air and fuel under normal op
erating pressures are simultaneously delivered,
upon initiating operation, and roaring combus
10 tion'noise ‘occurs upon initiating ignition of the
combustible mixture much greater than the noise
of combustion during the operation thereafter.
It is an object of this invention to control the
initial delivery of fuel and air in such a manner
that the noise of initial combustion-is no greater
than during normal operation.
With these and other objects inview, refer- '
ence is made to the accompanying sheet of draw _ the casing I.
The burner nozzle {I2 is mounted concentri-.
cally within the draft pipe 4 adjacent its open 20
end and adjacent the electric ignition device l3.
The nozzle I2 is connected to the chamber In
from the scope thereof.
by an air pipe l4 axially mounted within the
In the drawing:
draft pipe 4 which enters said chamber adjacent
Figure 1 is a view in side elevation of an elec- ‘
top. The nozzle I2 is also connected to the 25 '
25 trically operated andgcontrolled ?uid fuel burner chamber I0 by ?uid fuel pipe I5 extending con
ing which illustrates a preferred embodiment of
this invention, with the understanding that‘de-v
. tail changes may be made without departing
mechanism to which this i vention has been ap
centrically within said air pipe M which is ex
plied, with parts broken afway, and parts shown
‘ tended within the chamber 10 to adjacent the
bottom thereof, and the entrance of fuel therein ,
in section.
Figure 2 is an enlarged detail view in central
is controlled by a. ?oat-operated valve 16 actu- 30
ated by the level of the fuel within the cham
ber l0 received from the said pressure pump.
The pressure created within the chamber In de
livers both fuel through the fuelpipe I5 and air
through the air pipe M to the nozzle l2 where 35
~30 vertical section of the improved control device,
with parts shown in elevation.
Figure 3 is a view partly in elevation and partly
in section of a modi?cation of Figure 2. Figure
4 is a schematic wiring diagram of the ignition
the fuel is delivered in a vspray into the sur
I developeda particular type of .?uid fuel-i
_ burning mechanism wherein the fuel is deliv
ered in a constant ?ow by a metering pump to
a pressure pump which receives theq?uid fuel
rounding stream of air from the blower passing
through the draft pipe '4 and the combustion
mixture is initially ignited by the ignition device 40
l3. This particular construction above described
40 and atmospheric air and then delivers the fuel ' is fully disclosed in my prior Patent No. 1,831,277,
and air under pressure to a chamber wherein the
pressure created therein delivers the fuel through
. a ?oat-controlled valve to a fuel pipe and the
air through an air pipe surrounding said fuel
' pipe to'a nozzle where the fuel and air are de
livered in the form of a spray surrounded by
air under pressure from a fan blower to be ig
nited by an‘electrical ignition‘ device. This con
struction is fully disclosed in my prior Patent
50 No. 1,831,277, dated November 10, 1931, and as
this invention relates to' a particular control to
dated November 10, 1931.
The subject matter of this invention relates
to the particular constru ,tlon of an air muilier 45
attached to the air intake 8 in the casing 6, of the
pressure pump andv the results accomplished by
such construction.
It is customary in the electricallyoperated and
controlled ?uid fuel burner mechanism above 50
described, when the space to be' heated has
reached the, predetermined degree of temperature
be added to such structure, it is thought that the
above description is sufficient to the understand
for the room thermostat to open the circuit to the
burner and the mechanism ceases to operate.
The motor, fan blower,‘ fuel vmete 'ng pump, and
ingof this invention.
air and fuel pressure pump remain idle until a" 55
2 '-
Figure 1 illustrates an embodiment of this in
call. for heat initiates operation. In accordance
with this invention, when operation is initiated,
of ‘said plunger into an axial passage 30 therein,
communicating with the interior of the casing l1
below said plunger. It is preferable to provide the
said passage 30 with a needle valve 3| adjustably.
mounted within the tube 26, as shown in Figure 2.
When the pressure pump ceases to operate, the
weight of the piston and dash-pot mechanism
attached upon the under side thereof will allow
the fluid to lift the ball check 28 to accelerate the
the air intake to the air and fuel pressure pump
is throttled, so that when the said pump ?rst
starts to operate, no air is drawn in through the
air intake and the suction resulting from con
tinued operation gradually opens the air intake
until the-normal amount of air passes there
through. The result is that at the start of opera
10 tion the pressure within the chamber In is built
travel of the plunger.
up gradually until normal operating pressure’ is’
reached and the amount of air and fuel delivered
from the chamber III to the nozzle enters the noz
zle l2 at a lesser rate and gradually increases to
16 . normal as the pressure within the chamber be-'
comes normal. The result is that the combustible
mixture formed at the nozzle ignites with smaller
?ame increasing to normal and the ignition oc
curs without the initial roar.
The improved air muffler for producing the
above result includes a cylindrical casing I'T, pref
erably formed with a closed lower end l8 and a
removable cover IQ for the upper open end. An
aperture 20 corresponding in size to the air in
take 8 ofrthe pump casing 6 is provided in the‘
It is preferable to provide the exterior of the
casing l1 with a spaced-apart air strainer 32 in
the form of a wire mesh cylinder to prevent for
eign matter from entering the air inlet ports 24,
and also provide the under side of the piston 23 15
with- a similar cylindrical wire mesh strainer 33
to'prevent the bleeder passage 25 from (becoming
It is desirable to open the circuit to the igni
tion device after combustion has been completed 20
and this may be accomplished 'by the movement
of the piston 23, if so desired. When the piston‘
23 is‘ to be employed for this purpose, a housing
34 is substituted for the removable cover IS. The
housing mounts a tiltable mercury tube switch 25
casing _|'I adjacent its upper end which is held 7. > 35 connected by wires 35“ and 35b in the ignition
circuit, shown in Figure 4, mounted upon a pivot
ed support 36 normally passing over the center
in alinem'ent with the air intake 8, in any de
sired manner, such as by screws 2| passed through
years 22 provided upon the casing II to hold said
casing securely upon the pump casing. 6.
A dash-pot controlled piston 23 is mounted to
reciprocate within the casing H, which, in its
lowermost position, will snugly ?t therein.
pf the casing l1 and engaged with a stop 31 with
in the housing 34 to support the switch in the 30
closed position; The piston 23 is provided upon
its upper side with a concentric switch operator
3?“ adapted, as the piston approaches the upper
end of its travel, to engage the support 36 and
about the casing IT below, the under side of the tilt it about its pivot to open the switch 35. To 35
piston 23 when in its lowermost position, as shown allow of this operation and still maintain the
in Figure 2. The inner diameter of the casing suction within the casing I 1, it is preferable to
I1 is gradually increased toward the ‘top from the employ a ?exible metallic bellows 38 having a
40 upper side of the piston 23 when in its lowermost closed end normally in engagement with the un
position, anda bleeder passage 25 is provided in der side of the support 36 when the switch is
the piston 23 in communication with the interior closed and its open end having an annular ?ange
of the casing I‘! on each side of the piston.
adapted to be secured between the contacting por
When the fuel and air pressure pump starts to, tions of the top of the casing l1 and housing 34.
It is also preferable to cause the free end of the '
8 and 20 within the casing l'l upon the upper side support 36 to travel over an adjustable post 39 45
of the piston 23, and the piston, from in its lower
mounted upon the stop 31 and provide a spring
most-position where it obstructs the entry of air‘ .40 coiled=aloout the post 39 with its ends en
through the ports 24, will gradually be drawn up
gaging the head of said postland upper side of
85 plurality ‘of air intake apertures 24 are arranged
50 ward and in so moving will gradually allow the
incoming air to pass'about its periphery as the
_ diameter of the casing increases, until the normal -
amount of air passesthrough the pump intake 8.
If desired, the inner walls of the casing H may
. 55 be provided with other means for allowing the
incoming air to ?ow in increased volume about
the piston as it ascends, such as by providing a
plurality of gradually deepening grooves in the
walls of the casing.
Inorder to give the piston 23 sumcient weight
to normally return to its lowermost position, upon
cessation of operation of the fuel and air pres
sure pump, and to adjustably regulate the rate
of upward travel thereof, it' is preferable to mount
65 the piston23 upon a depending concentrictube
26 adapted to engage the 'bOttOm I 8 to-properly
locate the piston at the ends of its downward
travel, which tube mounts adjacent its lower end
a dash-pot 'plunger? provided with one or more
70 ball checks 28, Sumcient ?uid, such-as oil, is in-'
. troduced into the casing II to co-act with the‘
plunger 21 for the purpose desired.
Upon the ‘upward movement of the piston 23
and plunger 21, the ?uid above the plunger passes
75 through ports°29 in the tube 26 adjacent the top
said support to normally insure the returning of
the switch 35 to the closed position when the 50
plunger 23 has returned to its lowermost end of
travel when the mechanism ceases operation.
As the casing H with its air inlet 20 communi~
eating with the air intake of the air and fuel
pressure pump also acts as a muiiier and is pro-'
vided with the screens 32 and 33 to prevent
foreign matter from entering the casing and
pump, the interior of the cylindrical air strainer
32 may be provided with a lining of porous felt
4 I, as shown in Figure 2, if desired, to deaden the
sound of the air sucked through the screen mesh
of the strainer 32.
, What I claim is:
1. In an electrically operated and controlled
?uid fuel burning mechanism having an electrical
ignition circuit and including a fuel and air pump
having an air intake, a cylindrical casing closed
at the lower end secured over said intake air inlets
provided in the wall of ‘said casing, a piston
mounted to. reciprocate between said air inlets
and said pump air intake, means in the ‘casing in
creasing the rate of air ?ow to said pump air
intake as the piston moves in the direction of
the said pump air intake, a housing secured over 75
the open end of the casing, a switch in the igni
tion circuit mounted within said housing, and
means upon the, adjacent side of said piston
adapted to enter said housing'as the piston ap
5 proaches that end of its travelgto de-energize said
ignition circuit.»
2. The structure of claim 1, wherein said switch
is a mercury tube switch, a tiltable support for
said switch pivotally mounted within said housing
10 to extend over the axis of said housing, and said
7 operating means includes an axial projection
mounted upon said piston adapted to tilt said
support about its pivot.
v3. The structure of claim 1, wherein said switch
15 is a mercury tube switch, a tiltable support for
said switch pivotally mounted within said hous
ing to extend over the axis of said housing, and
said operating means includes an axial projec
tion mounted upon said piston adapted to tilt ,
said support about its pivot, and wherein a ?ex
ible metallic bellows having a closed end and an
annular ?anged end is secured by its ?ange be
tween the housing and easing withpits closed end
engaging the under side of said switch support,
whereby the suction is maintained within the eas
ing during operation of the pump.
4. The structure of claim 1, wherein said switch
is a mercury tube switch, a tiltable support for
said switch pivotally mounted within said hous 10
ing to extend over the axis of said housing, and
said operating means includes an axial projection
mounted upon said piston adapted to tilt said
support about its pivot, and means within the
housing co-acting with the pivoted switch sup 15
port to contract the said bellows upon the move
ment of the piston away therefrom.
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