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Патент USA US2127172

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Aug. 16, 193s.
2,127,41 72
Fil-ed May 17, 1937
2 Sheets-Sheet l
` Eg..
.Puentes Aug. 1c, 193s '
UNiTaD .STATT-:s PATENT carica 'V
. 3,121,172
'mais nemica, Paris, France, minor' to ,sc_
clêté'llateau, Paris, France,Y a corporation of
'application may 11, 1931, sei-iai No. 143,229
May 2_3. 193s
lin Franc
s ciiiinrii».î (ci. 15s-ssi
According to the essential feature of the pres
Therev exist> furnaces heated by means of a ' ent invention, I provide, in connection with the
liquid fuelgsuch as mazout, in which the feed
of said fuel is controlled through anïoutilow or
discharge conduit ñtted on the delivery pipe of
5 the burner feed pump.
This pump is for instance a volumetric pump
delivery pipe of 'the fuel pump, a number of.`
discharge circuits equal to the number of burners,
each of these circuits being-ñtted with a. control 5
member operated in such manner that, at any
time, the opening of the passage is the same for
all the circuits, andwith a cut-off. member or
working at uniform speed and supplying. conse
quently, a uniform total feed. TheV variation of ` valve adapted to be always opened or closed at the
the section of this discharge conduit, since it per
10 mits of returning a portion of the fuel to the
intake of the pump or to the feed tank thereof,
same time as the corresponding burner.
result from the following detailed description of
permits of controlling at will the portion of the
v delivery that passes to the burners.
i 10
Other features ofthe presentA invention will
a specific embodiment thereof.
A preferred embodiment of `the present ‘1n
Therefore, in the case of _a furnace fed by
'vention will be hereinafter described, with` ref-l la
15 means of a 'single burner or a fixed number of
erence to the accompanying drawings, given
'burners all controlled byl the same discharge
means, the useful feed of fuel supplied by said
burner or burners depends merely upon the po
sitlonïvof said control means. But- lf the number
20 of burners in operation is variable, according to
the working conditions of the system, then the
total useful feed of mazout depends both upon
the degree of opening of said discharge means
and upon the number of burners in service. For
25 a given position of the discharge means, for in
stance, the useful feed‘will be in proportion ofv
the number of burners in service.
Inversely, in order to obtain the same useful'
feed with different numbers of burners, it is nec
w essary to give different positions to the dis
merely byway of example, andin which:
charge means.’
.boiler furnace having four burners, .the steam
pressure of the boiler being automatically lregu
Fig. 2 shows the curve of variation of the fuel
pressure as a function of the useful feed to the
The fuel. for instance-mazout, drawn from '
tank I by pump 2, is delivered through pipe. 3 30
into chamber'd, and then,~ through pipe 5, to a
plurality of burners, for instance four in the '
This may involve disadvantages, especially
when the control n_ieinr r is operated by an auto
matic regulator. For instance,- in the case of
85 a boiler furnace, the opening of the mazout dis
_ charge may be automatically performed either by
'a steam pressure regulator or by a steam feed
regulator, or again by any other combination.
'In these .various cases, the obtainment of the
4o same useful feed of fuel will depend upon whether
thereds la greater or smaller number'of burners
in service for different‘posiiions of the control
member, that is to say for different valuœ of
the control parameter, to wit pressure _or feed of
Now, itis generally desirable that the
determination of this variable should be always
the same fora predetermined rate of combustion,
whatever be the number of burners -employed
for obtaining this rate of combustion..
Figs. la andl 1b are respective portions, intend
ed to be assembled along line a--`-a. of a diagram
matical view illustrating thel general arrange- 20
ment of a system according to the present in applied to the particular case of a
particular case. These burners are designated on
the drawings by reference characters 6--87-,6'2- ` .
Chamber ii is provided with >discharge or return »
orifices, 1, 1', 11",»,and 1"' (the number of which
is equal to the number of burners) vadapted to
return to tank I a portion of the mazout present
in tank- I, through return conduit 8. The useful 40
section of these discharge orifices is controlled
by the position of four adjustment needle valves
9, 9',~9", and 9"' having identical profiles and
which move simultaneously under the action of a
piston I0 »with which they are connected through 45
a transverse member II, in such manner that
the displacements of these needle valves -are al
ways the same for all of them. These needle
valves- may bereplaced by any other/equivalent
means giving, for each -position of th’e whole, an 50
The object of the present invention is to pro
vide a 'system with which the control of the
equal section of the oriñces 1, 1', 1" and 1'.".
Finally, valves or other cut olf means I2, I2',
rate of feed of fuel is independent of the number , ` I2" and IZ'" are adapted to cut off each of the
burners from the mazout feed pipe 5, and, on the
f of burners in service, this rate of feed being de
termined solely'by the position of the regulating
55 member which controls the discharges; fuel.
other` hand, valves I3, i3', I3" and I3’" are in- 55
I terposed between the
respective discharge orifices
tion, piston III is gradually lowered, which re
1„1', 1", and 1"' and the pipe I through which
duces the section of flow to the return passages.
'I'he feed to the burner therefore increases accord
ing to vcurve AB of Fig. 2, in which the useful feeds
q are plotted in abscissas and the mazout pres
. mazout is returned to tank I.
lPump 291s of the'volumetric type, driven at a
uniform speed, therefore supplying a constant
feed of mazoutl
- _supposing that all the valve
me'ans l2, lr...
I2", I2"’ and Il, I3', Il", Il’" are open, it is
10 clear that for a certain opening of needle valves
9 to 9"’ the total delivery of the pump is dis
tributed in a given proportion between the burn
ers and the return pipe 8. 'If the needle valves
are closed, the whole of the delivery of the pump
15 passes through the burners. If, on the contrary,
the needle valves are fully opened, there is sub
stantially no feed through the burners. In other
words, the useful fuel feed can be controlled by
_ determining the position of the needle valves, that
is to say the position of piston I0.
Now, it will be supposed that, without'modify
ing this position, some of the burners are brought
out of service,- for instance burners 6" and'ß'",
by closing valves I2” and I2”.’ and also,_simul-
sures p in ordinates.
When the maximum feed Q of the burner is
reached, valves I2’ and I3’ _are simultaneously
opened. 'I'he useful ñow is not changed, but the
pressure drops from value P to value p'. 'I’he 10
system now works with two burners and the fuel
feed is increased by further lowering piston I 0.'
The delivery pressure and the useful feed vary
according to curve A'B' of Fig. 2,- and when the
maximum feed 2Q, corresponding to two burners 15
in service, _and to pressure P, has been reached,
the third burner is brought into service by simul
taneously opening valves I2" and I3".
'I'he starting of the fourth burner is-en‘ected ,y
in the same manner and, for the reduction of 20
the rate of combustion, the inverse operations are
to be effected, by closing always, simultaneously,
the cut off valve controllingA the burner that is
tobe brought out of service and the cut-off valve
It will be readily understood that the distribu
tion of the total feed between the return pipe 8 _inserted in the corresponding return circuit.
It is> possible, with such a device automatically
~ and the burners 6 is not changed, that is to say '
taneously, valves I I" and I3’".
the useful feed remains the same. However, `as
this useful feed now passes through two burners
6 and 8', whereas, precedingly it passed through
four burners, the pressure of mazout through the
feed pipes and at the outlet of lthe lpump has now
to control the position of piston I Il and of the
discharge, or return,- valves by means of any reg
ulating means.
The example hereinafter described applies to 30
the case of a boiler furnace with adjustment of
the steam pressure.
In a general manner, and supposing that for
combustion, a number p oi'-
burners is used, an equal number of valves will
be opened on the return circuits above referred to.
The pressure transformer I 4 is connected
through a pipe I 5 with the steam header of the
The steam pressure acts upon a manometric
deformable box I6 simultaneously. .with a spring
When designating by Sn the maximum opening
of each of the discharge orinces or passages 1. I1 and the pressure existing in as_econd mano
to 1"', the total passage for the useful feed of metric deformable box I8.
'I'he displacements of the bottom of this de 40
fuel is p.Sn and the total passage for the fuel
formable box are transmitted to a valve 49.
returned to the tank is p.Sn.X, in which X desig
On the other hand, a pump 20 draws oil from
pates the degree of opening of the control valve
-a tank 2| -and delivers it under pressure into
discharge passage . It follows that, under these pipe 22. This oil successively undergoes two ex
pensions through orifices 23 and 24 and then 45
conditions, the total feed of the pump is dis
returns to tank 2I through
tributed betweenthe
useful feed and the amount -
returned to the tank proportionally to numbers
Sn and Sax..
If I keep the _same-opening of the regulating
pipe 25.
These two orifices 2l and- 24 are defined by
the position of valve I 9, in such manner that ,
one of theni increases when the other one de
o_r control valves, that is to say the same value y creases and inversely,A which involves pressure
of X, but I make use of q burners instead of pl I 4variations in‘ the intermediate chamber 26., 'As
the total passages become respectively Saa and this chamber is in communication with the -in
55 Sn.q.X.
ere ore, the distribution of the feed ` side of deformable box Il, it is clear that the
system is in equilibrium when the oil pressure
is equal to the din’erence between the steam pres 55
sure and the strength of spring I1. ' '
v This system therefore ensures the independence
60 of the control of the maxout feed, which ldepends
solely upon the position of piston III and the num
Finally, I obtain, in pipe 21, an oil pressure
which variesl exactly in accordance with the vari-"_Í
ations of the steam pressure. This oil pressure
ber of burners in service. 'I'he bringing in_to, or -acts upon piston Ill in opposition with spring 2l.
When the amount of steam required' from the
out of, service of a burner takes place by simul
taneously opening or closing one of the 'valves I2 boiler increases, for instance as a consequence
and the _corresponding valve I3 to II'", of the opening of the. output passages to the uti
this operation having no disturbing influence upon lization apparatus, the pressure in the header
1 the control of the fuel feed.
As it is generally advantageous to employ, for
_a given rate of combustion, the minimum possible
70 number of burners permitting the flow of the
lcorresponding feed of mazout, the control of the
decreases and also the oil pressure in pipe 2l also 65
decreases. Piston III.' pushed by its spring I'I,
therefore moves downwardly, which closes the
fourorifices 'I to 1"' and increases the feed
to _
the burners. yThis increase of the fuel feed _in
creases the production of steam in the boiler 70
All the needle valves 9 to 9"' being fully opened, ' and consequently tends to reestablish the steam
valves I2 and I l are opened, the other cut off Pressure to_its value corresponding _to the equis»
l furnace might take place in the following manner:
closed, and only burner i is
75 valves remaining
In order to Increase the rate of combus
librium of the system.
0f course, the means for controlling the posi
tion of the needle valves, according to the de- 76_ _'
not in any way limited to this particular .example
-sired result, are not in any way limited to this
since, for instance, instead of the venturi I might
particular example. For instance, always in the
make use of any feed meter, or again I might
case of a boiler, I may make use of a steam feed
regulator, either alone or in combination with a
employ, as control parameter, a variable other
than the feed of mazout.
For instance, I might make use, for this pur-.
The control of the number of, burners in service pose, of the stearn’pressure.- I may also 'make '
may. also be obtained automatically. The fol
use of the mazout pressure. _The’distributor 33'
lowing device constitutes an example of auto-_ is then controlled by a piston which moves when f
matic control starting a- new- burner every time; the mazout pressure exceeds value P (Fig. 2) 10
10 those in service reach their maximum
and comes bacl'r to its position when said pres
it .
and, inversely, stopping a
sure drops below value p’.
becomes possible to ensure
I_n a general manner, while' I have, in the above
system with a number of burners reduced by one. description, disclosed what I deem' to be prac
For this purpose, a Venturi nozzle 2s, inserted tical and eñlcient embodiments lof the present
15 in pipe 5 betweenthe discharge needle valves invention, it should be well understood that I do
and the burners gives a pressure drop which is not wish tobe limited thereto as there might be>
a function of the useful feed to the burners, espe 4changes made in the arrangement, disposition
pressure regulator.
cially forrates of feed of Q, 2Q, 3Q, correspond
ing respectively to the maximum output of one,
andform of the parts without departing from
the principle of the present invention as com
20 two, or three burners, or to pressure drops equal
prehended within the scope of the appended
to H', H", H'". This pressure drop acts through
two conduits 3h, connected respectively to pipe 5
What I claim is:
1..In a system including a number of liquid
pistons 3|', 3|",
outlet means, and a vpump for supplying liquid
32', 32", 32"'. These springs are lmade of suchv under pressure to said means in parallel, a con
respective strengths that they are successively trol -device which comprises, in combination, an
overcome by respective values of the pressure equal number of return liquid circuits inserted
on opposite sides of the venturi, and acting upon »
,drop equal to HUH", H'".
in parallel between the delivery of said pump 30
and the intake thereof, variable passage controlmeans in said return circuits respectively, means
for simultaneously operating said passage con
These pistons control the oil distributors 33',
33"', connected on the other hand to pistons
.30 33",
34'., 3d", 36"’ which control valves I2', I2", I2’"
- and to pistons 35', 35",`35"' which control valves
I3', i3", Iä’".
trol so that all of said control means always have
In the embodiment illustrated by Fig. i, burner
The oil delivered by pump f
35 6' is shown in service.
2|! into pipe 22 enters the distributor 33' through
conduit 36' and leaves it through conduit 3_1'. It
exerts its pressure through pipe Sß'upon piston
3ft', which compresses the opposing spring 39'
40 and opens valve I2'.
the same position in all of said return circuits
-respectively, valve means for controlling said
outlet means, cut-ofi. valve means in each of saidv
return circuits, and means interconnecting each
of said last mentioned valve means with one of
4the first mentioned _valve means, for causing them 40
Through pipe Q0', this oil pressure v,acts upon
to be operated simultaneously and in the same
2. In a system including a number of fuel
, piston 35', which crushes spring LI’ and opens ' burners, and a pump for supplying fuel under
valve i3’. Burners t" and B!" are shown as be- ' pressure to said. burners in parallel, a control
ing out of service, the position of the'respective -device which comprises, in combination, an equal,
45 oil distributors 33" and 33"' corresponding there
number of liquid return circuits inserted in par- j
to connecting pipes 31" and 31"' with the dis
through which oil re-\ allel between the delivery of said pump and the
_ charge pipes 62" and 42"'
intake thereof, variable passage control'means in
._ _
return circuits respectively, means for simili
Springs 39", 39"' on the one hand and 4I", _ said
taneously operating said passage control means 50
il i "’ on the other handare expanded, closing the so that all of them always have the ,same posi
corresponding valves. ,
tion in all of said return circ'uitsr'espectively,
’ The operation of this system takes place in the valve means for controlling said' burners, and
following manner:
cut-oil' valve means` in each of >said return cir
Burner „5 andvalves I2 and I3 are still con
cuits, and means interconnecting each of said
55 trolled manually for starting the furnace. When last mentioned valve means with’oneI of the first
turns to the tank 2l.
the output of this burner reaches the maximum mentioned valve means, respectively, for causing“, I
value Q, the pressure drop in venturi 29 reaches them to be operated simultaneously and in the 'I
»value H' and piston 3l' is moved, together with
same direction.
its oil distributor, which opens valves I2’ and3. In a system including a number of fuel
burners, a fuel tank, and a pump for supplying
If the fuel feed still increases, when it reaches ' fuel from said tank under pressure to' said
the value 2Q, the pressure drop in venturi 29 burners in parallel, a control system which com
reaches value H". Piston 3 I " then moves, bring
ing burner 8" into service, and so on.
lînversely, if the fuel feed is decreased, when
. its value 'reaches 3Q, then 2Q, and finally Q,
respectively, the pressure drop in venturi 29
passes. through decreasing values H'", H", H',
respectively, and springs 32"', 32", 32' succes
sively move back the corresponding pistons, which
ybrings out of service burners 6"', i" and 8', suc
Thiscontrol of the number of burners in serv
L ice is given merely by way of example and it
_795 should be weu understood that the invention is
prises, in combination, a chamber mounted on
the delivery of said pump, a number of liquid
return circuits, equal to the number of'fuel burn
ers, inserted in _parallel between said chamber
and said tank, a plurality of needle valves"- for
controlling the -ilow through said liquid circuits, 70
respectively, means for simultaneously operating
said needle valves so
that their degree of opening-r
is aways the same for all of them, valve meansì@
for controlling said burners, cut off valve means
in each of said return circuits, and means inter
connecting each of said last mentioned valve
' means with one of the iirst mentioned valve
pressure in said boiler, means operative by said
oil pressure for simultaneously aetuating-all-of
means, respectively, so as to _cause them to be
opetxi-ated simultaneously and «in the same di-`
said needle valves, cut-oil' valve means for con
4. In a system including a boiler, a furnace i'or'>
trolling said `burners, and cut-off valve means
each lof said fuel return conduits, each of said
said boiler anda numberl of f’uelv burners for '_ in
last mentioned valve means being associated with
said furnace, a fuel tank, and a pump for sup
plying fuel from said tank under pressure to said
burners, in parallel, a control device which com
prises, in combination,- a chamber mounted on
the delivery of said pump, a number -of fuel
return circuits, equ'al to the number of burners.
inserted in parallel between said chamber and
- said tank, a plurality of needle valves for con
trolling the flow of fuel through said fuel re
-turn circuits, respectively, adapted to determine
one of the first mentioned valve means, respec
tively, `to be operated simultaneously therewith,
and in the same direction.v
6. In a system including a boiler, a furnace for
said boiler, a number of fuel burners for said
furnace, a fuel tank, and a pump for _supplying
fuel from _said .tanki under pressure to said
burners, in parallel, a- control device which com
prises, in combination, a chambery mounted on
the delivery of said pump, a number of fuel re
turn conduits equal to the number of burners, in
serted in parallel between said chamber and said
a plurality of needle valveslfor controlling, boiler, for simultaneously actuating all of said ' tank,
the flow of fuel through said fuel return con
needle valves, 'cut-oi! valve means for control-_
always the same passage .through all of said cir
cuits, respectively, means, automatically opera
tive in response to th’e working conditionsfin said
ling 'said burners, and cut-0U valve means in
each of said return circuits, each of said last
‘mentioned valve means being associated with one
-of the first mentioned valve means, respectively,
to be operated simultaneously, therewith and in
the same direction.
5. In a system including a boiler, a furnace
for said boiler, a number of fuel burners forl
Vsaicl furnace, a fuel tank, and a pump for sup
plying fuel from -said tank under pressure to
said burners, in parallel, a 'control device which
comprises, in combination, a chamber mounted
duits respectively, adapted to determine always
the same passage through all of said respective
circuits, means for simultaneously actuating all
oi' said needle valves, cut-oil valve means for
controlling said burners, respectively,- cut-‘ofi
valve means in each of said return conduits, each 25
of said last mentioned valve means being associ
ated with one of the ñrst mentioned valve means,
respectively, to be operated simultaneously there
with and in the samel direction, and means, op
erative by the working conditions, for successively 30
opening and closingsaid burners in an automatic
on the delivery of said pump, a number of fuel
7. A system according to claim 6in which said
return conduits, equal to the number of burners, , last mentioned means are operative 'in response
inserted in parallel‘between' said chamber and
said tank, a plurality of lneedle valves for con
trolling the flow _of fuel through said fuel re
turn conduits, respectively, adapted to determine
always the same passagethrough all of said re
spective circuits, an oil circulation system, means
for- automatically controlling the pressure
through at least a 4portion of 4said circulation sys
tem in" accordance with variations of the steam
to variations of the feed of fuel from said»v pump ‘
to said burners.
8. A system Kaccordingtò claim 6 in which said `
last mentioned means-include a Venturi element
inserted between said- pump- and said burners,
and meansy operative by theÀ pressure drop pro 40
duced by said vVenturi element forJ controlling
said first mentioned cut-oil valve means.
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