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Патент USA US2113720

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Àpril l2, E938„`
l 2,3 13,720
Filed March 2, 1955
2 Sheets-Sheet 1
April 12, 1938„
Filed March 2, 1935
2 SheetsèSheet 2
/ v_»./Í
Patented Apr. 12, 1938
Stanley Percy Christie, London, England
Application March 2, 1935, Serial No. 10,279
In Great Britain March 7, 1934
1 Claim.
My invention relates to those internal combus
tion motors of the known type which use a com
bustion chamber above a liquid piston oscillating
(C1. 12S-19)
near, but short of, the dome of the combustion
chamber, so that the two spaces elsewhere sepa
rated by it are always connected over the top of
it. The path of the exhaust gases initially fol
lowed by the new charge is therefore downwards both before and after passing through the
louvers 8, then upwards between the inner wall
l' and the outer wall 9, and then over- the top of
wall 9, and between it and the wall of the com
bustion chamber downwards to the exhaust
valves, as indicated by the arrows.
According to my invention a balance port I0,
the charge at atmospheric pressure, hereinafter ` located near the top of wall l, is adapted, when
open, to establish equilibrium between the com~
called the charge space, and also in which the
bustion spaces on the two sides of wall 'I during
15 combustible charge is caused by suitable guides
the compression and explosion of the charge.
to follow the exhaust in a path which extends
A balance valve II adapted to close this port
downwards from the admission valve nearly to
ISB is arranged to open it at or near the beginning
the lowest level of the liquid surface and then
of the compression of the charge by the rising
rises upwards to the dome of the combustion
liquid, and to keep open until the pressure durchamber
ing expansion has fallen to a desired limit. In
towards the exhaust ports.
Fig. l, the lever l2 causes balance valve II to
The object of my invention is to enable the
be opened by the closing of exhaust Valve 4 when
whole of the charge in this tortuous path to be
this is touched by the rising liquid and compres
substantially at one pressure at any instant dur
sion of the charge begins.
ing its compression or expansion, and also to
N) Oi
Simultaneous ignition on both sides of wall 1
facilitate the simultaneous ignition of all parts
is ensured by the use of an ignition chamber I5,
of the charge.
Referring to the drawings which illustrate for example in the form of a ring pipe fed with
combustible mixture similar to that passing
merely by way of example means suitable for
through admission valve 3, for which purpose an
30 carrying out my invention:
auxiliary admission valve I 1 is used and operated
Figure 1 is a vertical section through the com
in a play-pipe for pumping liquid or for com~
5 pressing gas, and more particularly to those of
such motors as operate on a two-stroke cycle, to
which the combustible mixture is supplied at a
pressure above that of the atmosphere, and in
which the charge enters through an admission
10 valve at the top of the combustion chamber, and
the exhaust gases leave by an exhaust valve
located at the bottom of the space occupied by
bustion chamber of armotor embodying my in
Figure 2 is a section of an alternative means
for operation.
Figure 3 is a section through the combustion
chamber of a large unit employing several admis
sion valves.
In Fig. l, numeral I denotes the combustion
40 chamber closed at the top by seats 2 of the ad
mission valves 3. Exhaust valve 4 is located so
as to be closed in the known manner by the liq.
uid column 5 when this rises to the height at
which the charge volume remains above it. The
45 admission valves 3 are in an opening E in the
dome of chamber I, and from the edges of this
opening an inner wall 'I extends downwards
nearly to the lowest level to which the liquid falls
in oscillating. Below the level at which the ris
50 ing liquid closes the exhaust valve 4, the wall 'I
has louvered openings 8 adapted to enable the
mixture to pass through wall 1 and also to direct
it downwards. The inner wall 1 is surrounded
by an outer wall 9 which extends from below the
55 lowest level to which the liquid surface falls, to
synchronously with valve 3, and a non-return
valve i6 is interposed between valve I‘I and
chamber I5.
On the contents of this chamber
being ignited by sparking plug I8, flame is pro- 35
jected through a number of short bifurcated
ports I9 into the combustion spaces on both sides
of the inner wall 'I at the same instant.
The operations of one cycle of an upward and
a downward stroke of the liquid column are as 40
The column having moved downwards under
the action of an explosion and having come to
rest, the exhaust valve 4 has been opened by
springs 2l) and the balance Valve II has been
shut. Combustible mixture enters under slight
pressure through valve 3 and in passing through
louvers 8 in a downward direction displaces first
the lowest portions of the exhaust gases between 50
walls ‘I and 9, and then follows this exhaust up
wards and over the top of wall 9 until, by the
time the liquid level has risen to the exhaust
valve 4 and shut this, practically all the exhaust
has been replaced by new charge. The further 55
rising of the liquid column compresses this charge
equally on both sides of wall 1, as ensured by the
opening of valve II; and, on ignition, flame is
projected into the mixture on both sides of wall
'I at the same instant.
In a convenient form of construction the inner
wall 'I and outer wall 9 take the form of concen--
tric tubes of which the outer may be attached
to the wall of the combustion chamber I by
radial ñns or vanes 22 which guide the gases so
as to lessen dilîusion between the new charge
and the exhaust products. In Fig. 3 illustrating
part of the combustion chamber of a large unit
a plurality of admission valves each with a tubu
L. lar wall such as 'I and a balance Valve such as
II and bifurcated ignition ports such as I9 may
be used, and may be surrounded by one tubular
outer wall such as 9, and the annulus between
this Wall 9 and that of the combustion chamber
20 may itself be divided into segments by varies 22.
In Figure 3 vanes 2| divide the space within tube
9 into four parts.
In Figure 2, as an alternative mode of open
ing balance valve Il, it is shown connected
l@El through lever I2, with piston I3, of which the
right face is acted upon by the pressure in the
combustion chamber and the left face is acted
upon by spring I4, which is adjusted so that
valve I I shall be open while the pressure remains
above a suitable limit.
I claim:
In an internal combustion motor having a
combustion chamber over a liquid column oscil
lating in a play-pipe and operating on a two
stroke cycle, an exhaust valve located at the 10
bottom of the charge space, an admission valve
located at the top of the charge space, an inner
wall surrounding the admission Valve and ex
tending from the combustion chamber top to
the level of the exhaust valve, a perforated ex
tension of this wall nearly to the lowest level of
the'liquid surface, and an outer wall between
the inner wall and the exhaust valve extending
from below the lowest level of the liquid surface
to near they top of the combustion chamber, the 20
use <of a balance port inthe inner wall adapted
to be closed by a balance valve only while the
pressure in the combustion chamber is below a
desired limit.
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