Steam-Generator. Page: 4 of 5
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1,209,211
a semi-circle, a portion of the circle being
removed to leave a space for the passage of
the steam, as is clearly illustrated in the
drawings.
5 The baffle plates may be fastened in any
suitable manner to the inside walls of the
mixing chamber, the means shown in the
drawings consisting of a flanged strip of
metal 22, said strip being riveted to the wall
!0 of chamber 18 and to the baffle plates.
Directly above mixing chamber 18 in
chamber 2 is a valve 23, communicating with
water jacket 15, the stem 24 of which valve
being normally held down under tension of
15 the spring 25. Underneath, and in aline-
ment with the valve stem 24, is a thermostat,
secured to the underside of head 19, said
thermostat controlling the opening and clos-
ing, through stem 24, of valve 23. This
21 thermostat may be of any desirable form
which will accomplish the purpose. In the
drawings there is shown a small chamber 26
secured to the head 19, said chamber being
filled with mercury. Extending up through
25 chamber 26 and on up through mixing cham-
ber 18 and up to and resting against the un-
der face of valve stem 24 is a hollow copper
tube 27, open at the bottom and closed at
the top, said tube being filled with mercury
33 supplied from chamber 26. As the tempera-
ture rises in the mixing, chamber the tube
27 becomes heated and the mercury in said
tube and in the chamber 26 will expand and
as.it does so it will force the tube higher up
35 out of chamber 26 and thus force valve stem
24 upward, opening valve 23, and thereby
allowing the proper proportion of water to
enter the mixing chamber in the form of a
spray. To secure a proper adjustment of
40 the valve 23, and to thereby control the ex-
-tent to which it moves, there is provided on
the underside of the thermostat an adjust-
able member 28, in the form of a valve stem,
said member passing on up through head29
45 of cylinder 30, thence on through stuffing
box 31 and into chamber 26.
From the foregoing it is obvious that
when the adjusting member 28 is advanced
farther on up into the chamber 26, the ca-
50 pacity of said chamber is lessened propor-
tionally, and the mercury in seeking an
opening will advance in the tube 27 and
force said tube up against valve stem 24.
Conversely, when the member 28 is with-
55 drawn from the chamber, the capacity of
said chamber is increased, which allows tube
27 to fall farther back into said chamber.
Referring now to Fig. 2 as an illustra-
tion of the controlling means for fuel and
60 steam regulating or control valves 8 and 11,
the valves are each provided with lever arms
32 and 33, respectively, with a connecting
link 34 between the same, as shown. The
storage tank 20 is provided with a dia-
65 phragm or lever valve 35, said valve havinga lever arm 36 fulcramed at one end as at
37. The valve stem 35a of valve 35 is pivot-
ally connected to lever 36 as at 38. Extend-
ing up to lever arms 32 and 33 of valves 8
and 11 is a connecting link 39. When the 70
steam pressure rises in storage tank 20 it
acts on the diaphragm valve 35 to. cause the
valve stem 35a to raise the lever arm 36.
This arm in turn (through medium of link
39) raises lever arms 32 and 33, thus par- 75
tially closing valves 8 and 11, and admitting
less fuel and. dry steam to the combustion
chamber, hence decreasing the amount of
steam being generated, or vice versa. For
an adjustment of this control there is pro- so
vided a coil spring 40, secured at one end to
storage tank 20, the other end being adjust-
ably secured to lever arm 36, as shown in the
drawings.
For the initial heating of the water in 85
boiler 4 surrounding the-combustion cham-
ber there is provided a pilot or auxiliary
burner 41, traversing head 3. The burner is
connected to feed pipe 7 by pipe 42. To reg-
ulate the proper amount of fuel there is pro- 90
vided a globe valve 43 between the burner
and fuel feed pipe. To assist initial com-
bustion there is provided an air feed pipe
44 leading from an air pressure tank (not
shown) to the burner 41, and a globe $K
valve 45 on air pipe 44 controls the proper
amount of air introduced to burner 41. To
ignite the pilot burner it is necessary to first
remove plug 46 in head 3 and to open the
air valve 47 at the closed' end of the mixing 7.
chamber 2. The fuel and air valves to pilot
burner 41 are now opened and then through
the opening made by removing the plug 46
the burner is lighted. The plug 46 is next re-
placed and the burner 41 continues to burn 1 >
until enough heat has been generated in the
boiler 4 to operate the main burner 6. When
the main burner has been started the air
valve 47 is closed and fuel combustion begins
to take - place under pressure, the oxygen 13
necessary to support combustion being fur-
nished by the steam passing through pipe
10. When the steam pressure in boiler 4
goes above a predetermined point the relief
valve 14 automatically opens and allows the 13
steam to pass through pipe 13 into the mix-
ing chamber to thereby mix with the gases
from the combustion chamber. As said
steam is of a very high temperature, it
heats tube 27 sufficiently to cause the mer- 12r
cury contained in said tube to expand suffi-
ciently to open valve 23. This allows the
proper proportion of water to pass through
said valve. The water in jacket 15, being
practically up to a boiling point due to the 125
intense heat from the combustion and mix-
ing chambers, as it passes through valve 23
enters the mixing chamber in the form of
a spray which readily mixes with the gases
contained in the mixing chamber. When 130
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Sands, George. H. Steam-Generator., patent, December 19, 1916; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth859739/m1/4/?rotate=90: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.