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Патент USA US2086228

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July 6, 1937.
'
`
H. JÄNxcKE
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I
FREE PIs'roN Mö‘forz coMPREssoR
2,086,228
I
Filed Feb.- 23;'1935
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July 6, '1937.
H. JANICKE
2,036,228' f
FREE PISTON MOTOR COMPARESSOR
* Filed Feb. 25K: 1955
I ~.191 ¿Z
3 r Sheets-"Sheet 2v
July s, 1937.
v2,086,228
H. JÄNICKE
F‘REE PISTON MOTOR COMPRESSOR'
3 Sheets-Sheet 3
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Patented July 6, 1937
’ 2,086,228
UNITED STATES
PATENT OFFICE
2,086,228
FREE PISTON -MOTOR. COMPRESSOR
Hermann Jänicke, Dessau, Germany, as_signor to
Therese Junkers, Gauting, near Munich, Ger
lllaflly
Application February 23, 1935, Serial No. 7,787 '
In Germany March 9, 1934
20 Claims.
My invention relates to free piston motor com
pressors.
It is an object of my invention to pro
(o1. 23o-56)
varied at the same time; they may be varied in
opposite senses, in which case the influences ex-`
vide means whereby the output'of compressors
erted on the performance by suchvariations of
of the kind aforesaid can- be controlled in a par
pressure add.
Alternatively they may be varied v
5 ticularly simple and efficient manner.
In my copending~ U. S. application Serial No.
710,483 I have disclosed a'method of controlling
a free piston motor compressor by varying the
length of stroke -and the pressures thereof, e. g.
in the same sense, in which .case the performance
varies in conformity with the difference between
the influences 0I the pressure` variations. In the
case last mentioned the proportion of 'the two
pressures may be constant and, if the initial tem
10 the suction or discharge pressure, or a combina
perature is constant, the ?inal‘temperature of thel
compressed gas will also remain constant.
tion of both these pressures. My copcnding U. S.
application Serial No. ’7,786 discloses the control
of a free piston motor compressor by means of a
variation of the dead space and the fuel supply
15 -in a manner such that the piston stroke always
remains approximately constant, independently
2
from the variation of the compressor output,
While my copending U. S. application Serial No.
7,788. discloses the regulation of a free ypiston
motor compressor by the simultaneous variation
of at least two of the variables, which at a pre
determined constant stroke of the piston deter
mine the output of the compressor as well as the
return energy in such a manner that the portion
25 of the total return energy available for the com
pression of the motor charge must always re
main 'approximately constant.
_
In free piston motor compressors comprising
a combustion chamber and one or more com
30 pressor chambers, and one or a plurality of freely
with the energy which is released in the com
pressor proper upon the return stroke, compress
ing the charge in the combustion chamber. In
such" additional chambers the same procedure
may be adoptedas in the compressor chambers
proper, i. e. a variation _of>pressures, such as,
for instance. the initial pressure of compression,
at substantially constant str__ke of the free pis
ton or- pistons.
_.
The controls to be effected’. according to this
invention, i. e., the variation of pressures and
the variation of the quantity of fuel supplied to
the motor per power stroke,4 mayY be' effected
‘either manually orautomatically, or _one of them
manually, the other automatically.
tons. Such variation of 4stroke involves cer
tain drawbacks, as thereby the~control of the
motor part of the machine, which' is derived from
the movement of the free pistons, is subjected to
undesirable variations.
arise comparatively few v_or slow _variationsof the
vention by regulating the performance of the
compressor by varying the pressures and, at the
45 same time, influencing the supply of fuel to the
combustion chamber of the motor in such man-ner that the stroke' of the free pistons remains
substantially constant.
'
_
_
' In order to accomplish; this, I may vary
50
by additional chambers such as, for instance,
pneumatic buffers which store compression energy
during one stroke and deliver it during the sub
sequent stroke, this delivered energy, together
gested to vary the performance of the compressor
by varying the length of stroke of the free pis
in Wide limits at substantially constant stroke.
This is eñected according to the present in
(a) The delivery pressure; the performance
' drops when the pressure is increased, and vice
o
In some cases the problem is to vary the ,
amount of energy taken up or of energy delivered,
reciprocating pistons, it has already been sug
It is an object of my invention to enable the
40 performance of the compressor to be varied with
Ul
0
y _ l
Manual control is adopté’d, for instance;r if there
demand for compressed` gas','_"or_"`if "the frequire_
ments as tothe exactitudel of controllare vnot
high._ With such a control the variations of pres
sure as well as the variation ofthe fuel'supply
may be derived from the same control member
_(a hand Wheel, a lever, or the like) so that each 40
control operation requires only the actuation of
this one member.
f
_-
.
'
`
If both controls are effected automatically, they'
may be inñuenced by the variations- of a single
source of power,'for instance,4by the _pressure
in a storage tank arranged in series with the
compressor. In that ease both control operations
are connected in parallel and are suitably tuned
with respect to each other. j
_
However, it is also possible, to render one con
50
trol'operation dependent of the other, for in
stance by
regulating the pressure inthe
(b) The suction pressure; the j perfx‘irmancek compressor in dependency upon the pressure in
drops if 4this pressure is lowered, and vice versa; a storage tank, while the supply of fuel is regu- _
-_ (c) The delivery and suction' pressures may be
lated in dependency upon the pressure in the 55
.
2,086,228
started. 'I'he check valve I2 may consist sim
ply-me.- g. in a manner similar to that shown in
Fig. l-of- a valve body 4I, 42, which a spring
operations dependent from distinct conditionsl 40 tends to close. The top of this spring abuts
which are not directly related to one another, against a spring abutment 44, which, however,
for instance, to again vary the pressure in the in contradistinction to the showing of Fig. 1, can
not be varied as to its position, but may be pro
compressor in dependency upon the pressure in
the storage tank, but to regulate the supply of ',vided either as the cover of the valve casing
fuel to the motor part in dependency upon the itself or as some other part rigidly connected
with said casing. In this case the'force of the 10
10 stroke- in such manner that this stroke remains
compressor. In this case the two control oper
ations are- connected in series.
It is further possible to render the two control
I will now proceed to describe my invention
with reference to the drawings affixed to this
spring acting upon the valve body is always
maintained constant. Since the delivery pressure
in the compressor `is solely determined by the
specification and forming part thereof, in which
force of the spring, the delivery pressure in. the
substantially constant.
several embodiments of this invention are illus
trated diagrammatically by way of example.
In the drawings
Figs. 1, '2, 6 and 8 are axial sections of free
piston motor compressors with oppositely recip
20 rocable pistons, each of the last two figures show;
ing one-half of the machine while
Figs. 3, 4 and 5 are diagrams showing pressures
plotted against stroke for the compressors illus
trated in Figs. 1 and 2, and
25
-
Fig. 'lis a similar diagram for the pneumatic
buffer illustrated in Fig. 6.
In the free piston motor compressors shown in
Figs. 1, 2, 6 and 8, l is the casing of the motor
andv 2 is the central combustion -chamber with a
compressor chamber 3 at each end. ’I‘he free
pistons are formed- by engine pistons 4 and com
pressor pistons _5' which are directly connected.
In order to warrant absolute- synchronism of the
opposite reciprocatory movements of the pistons,
they are connected 4by suitable mechanism, for
instance a rack I5 connected to each piston, the
racks meshing at diametrically opposite points
with a pinion IB which is Ymounted for rotation
in -a fixed position on the casing I. The left
40 hand motor piston controls the scavenging ports
6 and the right hand motor piston controls the
compressor likewise can always be maintained r15
at a predetermined minimum value, i. e. may
be constant, as indicated >in Fig. 4 of the appli
cation, 'according-to which the suction pressure
only isf varied, while the delivery pressure, de
spite the aforesaid variation, has remained con 20
stant. On the other hand the check-valve I2
can be arranged for 'a variable force of the spring
_40 in such a manner that the delivery pressure _
of the compressor also is rendered variable.
A
valve of this kind is described below in greater 25
det '_l with reference to Fig. 1.
'
‘
e amount of fuel supplied'to the motor per
power stroke is regulated automatically in de
pendency upon the pressure in the storage tank
I3 by' turning the pump piston. To this end a 30
spur gear 30 is rigidly connected to the pump
piston 20. A rack 3l meshing with the spur gear
is supported by a piston 32 mounted to slide in
cylinder 33. A compression spring 34 acts on
,one face of the piston, while the pressure in the 35
tank I3 acts on the other face. 'I'he position of
the piston 32 is thus determined by the pressure
in the tank I3, and consequently the amount of'
fuel delivered at each stroke of the pump is a
function of this pressure'.
‘
\ exhaust ports 'l inthe wall of the motor cylinder.
ulating the compressor performance by a varia
’ 'I'he residual compressed gas which’rernains overÍ
tion of pressures.
45
in the dead spaces of the compressor at the end
of every power Vstroke expands and forces the
free pistons toward each other. When the pres
sure in 'the compressor cylinders has dropped
to suction pressure, fresh gas is drawn in through
the suction valves 8 and, at the same time, the
.
'
'
As shown in Fig. v1, a valve loaded by a spring
40 and opening toward the storage tank is in 45
serted in the main I I leading to the storage tank.
The spindle 4I of the valve has the size of a piston
so that the valve seat 42 is relieved of the pres
sure in the tank, and the delivery pressure of
the compressor is determined by the tension of 50
charge in the combustion chamber 2 is com
pressed. Toward the end of the: return str ke
liquid fuel is injected into the combustion ch m
spring 40 exclusively. This spring tension, in
the example illustrated, is regulated automati
ber 2 through pipe 22 and injection nozzl 23
by means of a fuel pump having a piston 20rand
55 a cylinder 2I, and the mixture is ignited. ,'The
cally in dependency upon the pressure in the
tank. To this end a wedge member 45 is in
serted between the end wall 43 of the valve cas
fuel pump, which is more fully described in my
copending application Serial No. 710,483, is oper
ated by a cam 24 formed on the rack> I5, which,
when the piston is near the end of its inward
60
stroke, turns a rocker 25 which displaces the
pump piston 20 against a spring 26.. The prod
ucts of combustion in the combustion chamber
force the pistons apart, the gas which has been
drawn into the compressor cylinders, is com
pressed and> conducted to a. storage tank I3
' through delivery valves 9, delivery pipes I9 and
delivery main. II. A pipe I4 distributes the com- .
ing and the spring plate 44 acting like a piston.
- The wedge member .is connected to a piston 49
which is loaded, on one side, by the tension of a
pressure spring 41, while its othergside is con
nected to the tank I3 through a pipe 48, so that
the piston 49 is acted upon by the pressure in
this tank. When the pressure in the tank- I3
increases beyond the normal, the piston 49 and
wedge 45 move -to the left, the tension pf the
valve spring 40 is increased, the delivery pressureof the compressor rises in proportion and the per
formance is reduced. Obviously the increase of
pressed .gas to the individual stations where it 1s
.
pressure in the compressor can _be much greater
required. `Aspring-loaded check valve I2 is pro
the increase of pressure in the tank I3, and
70 vided in the main II for holding the compres than
sion pressure in the compressor chambers at a the regulation will therefore be rapid and pow
predetermined minimum even if the pressure in
erful.
the reservoir should be lower than the minimum,
for instance in consequence of heavy tappings
75 of compressed gas, or when the compres-sor .is
40
Figs. 1 and 2 further illustrate means for reg
A
'
`
If it is desired to manuallyregulate the com
pression pressure, the wedge 45 and the means'
for Shifting it are replaced by a threaded spindle
2,086,228
3 .
which is inserted in the end wall 43 of the valve
reduced in the proportion of the products from
casing and exerts pressure on the spring plate
suction line and suction pressure.
44.
-
.
Fig. 6 shows a free piston motor compressor
with a pneumatic buffer comprising a cylinder 65
and a piston 66 which absorbs energy during the
-
Fig. 2 shows means for regulating the perform
ance of the compressor by varying the suction
pressure. Here all the suction valves 8 are con
nected to a suction pipe 5I in which a throttle
valve 50 is mounted to' slide, which is connected
to a piston 53 which, through a pipe 54, is acted
power stroke of the freely‘moving masses, stores ‘ ,
this energy in its dead space under the form of '
compressed gas, and returns it to the freely mov
ing masses A during their return stroke.
. upon by the pressure in the tankV I3 in such man
The
amount ofl energy absorbed and delivered by the 10
ner that this pressure tends to close the throttle
buffer is regulated, according _to this invention,
valve, While a spring 55 counteracts the pressure
on the‘ piston. The spring is so designed that the
throttle valve is closed in proportion as the pres
sure in the tank I3 rises beyond the normal, and
the suction pressure is progressively reduced.
The control of the supply of fuel to the motor
by varying the pressure existing in the buffer
space at the beginning of compression.l To this
vend the space 61 is connected tothe storage tank '
I3 by a pipe'69 which opens into the buffer space
at 68, i. e. in the vicinity of the position which
the end of the buiîer piston occupies at the begin
may be effected in dependency upon the pressure
in thetank, as shown in Fig. .1.
ning of the power stroke.
-
l
The operation- of this device appears from
'
The fuel supply may, however, also be regu
Fig. 7 which shows the diagram of such a buffer. 20
If the pressure in the tank I3 has its normal value
lated in dependency upon the suction pressure,
as shown byway of example in Fig. 2. ' To this
pm, compression in the buffer occurs ’from this
end the pipe 35 leading to the cylinder 33 of the pressure pm along line S fI‘. If the pressure in the
fuel-regulating device, instead of being connected ` >tank I3 rises to the higher value pn, the new
to the tank I3, is connected to the compressor compression line is U V, and the energy absorbed 25,
chamber 3,»this connection ending at -59 in the and delivered by the buffer is raised by an amount
` vicinity of the end face of the compressor piston . corresponding to the area S T V U S.
5 when this piston has just started for the com
pression stroke. Mountedv in the pipe 35 is a
closing member having the form of a slide valve
60 formed with a port 6I. This slide is con
like,.may also be so arranged that it absorbs' en
ergy upon the return stroke of the freely moving 30
mas's, and delivers such energy upon the power
nected to the short arm of a rocker 62, the long
arm of which is engaged by a pin 63 on the rack
I5, so that the reciprocatory movement of the
pistons is transmitted to the slide 6I). The ar-~
stroke of the same. If the compressor piston is
larger than the motor piston, the differential pis
ton area of the two, and~ the .space 'I0 (Fig. 1)
stitute the buffer or additional compressor.v The
amount of energy absorbed by such buffers or
compressor chambers during the return stroke of.
the freely movable masses may also be varied by
pressure variation, as illustrated, for instance, in 40
suction pressure acts on the opening 59, the con
nection being severed when the compressor piston
5, during its compression stroke, moves to the
other side of the opening 59 and exposes same to
Fig. 8. The space 'I0 adjoining 'the left hand side `
of the compressor piston 5 may, for example, be a
’ the pressure at the rear of the compressor piston
scavenging pump equipped with suction valves 1I
and delivery valves 12. A pipe ‘I3 extends from
the delivery valves 12 to the scavenging air tank 45
'M (Fig. 6). A throttle 15 is insertedin this pipe
which, in a manner similar to the throttle accord
ing to Fig. 2, is influenced vby the pressure in the
tank I3 in such manner that its throttling action
is increased when ,the pressure rises, and vice
In this manner interference of this pressure
with the operation of the fuel-regulating device
30-34 is prevented.
.Cil
-
‘
Fig. 3 is a diagram _illustrating the Way in
which the compressor is controlled by an increase
of the delivery pressure. A B C D A is the
diagram for the normal operation of the com
pressor.' Compression occurs from the suction
pressure p1 tothe delivery pressure pz. If the
delivery pressure is raised to p21, the new com
pressor diagram is 'A Bz C2 D1 A. The suction
line D1 A of this new diagram is shorter than
the suction line D A of the normal diagram.
The quantities of gas drawn in, and consequently
also the quantities of gas delivered, vary in the
versa.
f
--
-
r
I wish it to be understood that I do not desire
to be limited to the exact details of construction
shown and described for obvious modifications
will occur to a person skilled in the art.
same proportion as these lines.
Fig. 4> is a diagram showing the control by a
reduction o_f the suction pressure. Here again
35
in which this differential area operates, may con
rangement is such that the port 6I connects the>
compression chamber 3 to the cylinder 33 only if
5.
~
The buffer, or an additional'compressor or the„__
'
1. A free 'piston motor compressor comprising
in combination, a'motor cylinder and at least one
compressor cylinder arranged o-n either s_ide
thereof, a fre'e piston in each cylinder, comprising 60
A B C D A is the diagram of normal~operation. _ a motor piston and a compressor piston arranged
If the suction pressure is reduced from p1 to p11, _ on the same' side of the motor cylinder being di
the new diagram is A2 Bi C Dz A2.` The per
formances are proportioned similarly as the line
B C (at normal performance) relative to the line
rectly connected with each other, means for vary
ing one of the _initial and en_d pressures in said
compressor cylinders and means for at _the same
B1 C (at reduced suction pressure).
'
time varying the supply of fuel to sai-d _motor cyl
Fig. 5 is the diagram of a compressor in-which i" inder in such manner that the length of the pis
the performance is regulated by simultaneously
varying the delivery and suction pressures in op
posite senses.
If the performance of the com
pressor (the normal diagram of which is again
A B C D A), shall be reduced, the suction pres
sure is reduced from p1 to p11, While the` delivery
pressure is increased from p2 top-2i. The new
diagram is Az B2 C2 D2 A2. The performance is
ton stroke remains substantially constant.
2. A free piston motor compressor comprising
in combination, a motor cylinder and at least one 70
`compressor’ cylinder> arranged on either side
thereof, a free piston in each cylinder, comprising
a motor piston and a compressor piston arrangedr
on the same side of the motor cylinder being di
rectly connected with each other, means for vary 75
4
_ 2,086,228v
compressor cylinder arranged on either side
thereof, and at least one scavenging pump cylin
der, a free piston in each-cylinder, comprising a
motor pistonand-a compressor piston arranged
ing both the initial and end pressures in said com
pressor cylinders and means for at the same time
varying the supply of fuel to said’motor cylinder
in such manner that the length of the piston
on the same side of the motor cylinder being
ve1 stroke remains substantially constant.
directly connected with each other, means for
varying one of the initial and end pressures- in>
said compressor cylinders and- in said scavenging
’pump cylinder, and means for at the same time
10 inder, a free piston in each of said cylinders, com- ' varying the supply of fuel to said motor cylinder ll
prising a motor piston and a compressor piston in such manner that the length of the piston
arranged on the same side of the motorcylinder' stroke remains substantially constant.
9. The combination, with the free piston motor
being directly connected with each other, means
for varying one of the initial and end pressures in _ compressor of claim 2, of means for keeping the
relation between the initial and the end pressures
15 said compressor and additional compression cyl
inders, and means for at the same time varying in said compressor cylinders constant.
10. The combination, with the free piston mo
the supply of fuel to said motor cylinder in such
tor compressor of claim 4, of means for keeping
mannerv that the length of the piston stroke I_.f'e
mains substantially constant.
` .«.
,
the relation between the initial and the _end
20
4. A free piston motor compressor comprising pressures in said compressor cylinders constant.
11. The combination, with the free piston mo
in combination, a motor cylinder, at least one
compressor cylinder arranged 'on either side _ tor compressor of claim 1, of means for regu
3. A free piston motor compressor comprising
-in combination, a motor cylinder, at least one
compressor cylinder arranged on either side there
of and at least one additional compression cyl
thereof and at least one additiogal compression ` lating the fuel supply to the motor cylinder. in `
dependency from one-of the initial and end pres-_,
cylinder, a free piston in each o _f said cylinders,
sures, subjected to variation, _in the compressor
25 comprising a motor piston and a compressor pis
ton arranged on the same side of t e motor cylin
der _being directly connected wi` h each other,
means for varying both the initial and` end pres
sures in said compressor and additional com
k30 pression cylinders, 'and means for ait the same
' time varying the supply of fuel- t vsaid motor
cylinder in such manner that the ength of the
piston stroke remains substantially constant.
~5. A free piston motor compres'?oiL comprising
«
cylinders.
'
.
12. A free piston motor compressor comprising
in combination, a motor cylinder and at least
one compressor cylinder arranged on either side '
thereof, a free piston in each cylinder, compris- 3
ing a motor piston and a compressor piston ar
ranged on the same side of the motor cylinder
_ being directly connected with each \other, means '
for varying one of the initial and end pressures
in combination, a motor cylinder, a pluralityof in said compressor cylinders,_means for at thel
compressor cylinders arranged on either side f' same- time varying the supply of fuel tó said
thereof, a free piston in each of said cylinders, motor cylinder in such manner that the length4
of the piston stroke remains substantially con
comprising amotor piston and a -compressor pis
ton arranged, on the same side of the motor cyl
stant, and Va. single _adjusting member adapted
inder being directly connected with each other,
40
means for varying one of the initial and Aend
pressures in part -of said compressor cylinders
and means for _at the same time varying the sup
.ply of fuel to said motor cylinder in such manner
45 that the length of the piston stroke remains -sub
stantially constant.
'
Q
6. _A free piston motor compressor comprising
in combination, a motor cylinder, a plurality of
compressor cylinders arranged on _either side
50 thereof, a free piston in each of said cylinders,
to effect the. variation of one of said pressures
. and of said fuelsupply.
‘
\
'
13. A free piston motor compressor comprising '
in combination, a motor cylinder and at least
one compressor cylinder arranged on either side ’
thereof, a free piston in each cylinder, comprising
a motor. piston and a compressor piston arranged
on the same side of the motor cylinder being
directly connected with each other, means for
varying _both the initial and end pressures in`
said compressor cylinders, means for at the same rn
comprising a motor piston and a compressor pis „time varying the supply of fuel to said motor
cylinder in such manner that the length of the
t0n arranged on the same side of the motor cyl
-inder being directly connected with eachother, piston stroke remains substantially constant, and
a single adjusting member adapted to effect the
means for varying both the initial and end pres
55 sures ln part of said compressor cylinders and Avariation bothv of said _pressures and of said fuel A
' means for at the same time varying the ‘supply _. supply.
14. A
_\ of fuel to said motor cylinder` in such _manner '
that the length of the piston stroke remains sub
stantially constant.-
'
.
free piston motor compressor comprising
in combination, a motor cylinder and at least
,. one compressor cylinder arranged on either side
‘ 7. A free piston motor compressor comprising thereof, a free piston in each cylinder, compris A
in combination, a motor cylinder, at least one , ing a motorl piston and a compressor piston ar
compressor cylinder arranged on either side ranged on the same side of the motor cylinder
thereof, and at least one pneumatic buil’er cylin
being directly connected >with each other, means
der, a free piston'v in each cylinder, comprising a for varying one of vthe initial and-end'pressures
piston and a compressor .piston `arranged in said compressor cylinders, means for at the
65 vmotor
on 'the same side of the motor cylinder being ' same time varying the supply of fuel to said mo
directly connected with each other, means for 4tor cylinder in such manner that the length of
varying one of the initial and end pressures in ' . the piston lstroke remains substantially constant,
said compressor cylinders and in said pneumatic and a single source of power adapted to move both _
_
_
buffer cylinder, and means for at the same time said members.
15. A free piston motor compressor comprising
-varying the supply of fuel to said motor- cylinder
~`-v~-in such manner that the length of the piston in combination, a motor cylinder and at least one
j 60
stroke remains substantially constant.
i
8. A free piston motor compressor comprising
in combination, a motor cylinder, ‘at least one
- compressor cylinder arranged on either side
thereof, a free piston in each cylinder, compris-_
in_'g a motor piston and a compressor piston ar- '
2,086,228
5
in combination, a motor cylinder, at least one
compressor cylinder arranged on either side
ranged on the same side of the motor cylinder
being directly connected with each other, means
for varying both 'the initial and end pressures in
thereof, and at least one- pneumatic buñ'er cyl
said-compressor cylinders, means for at the same
time varying the supply of fuel to said motor
cylinder in such manner that the length of the
piston stroke remains substantially constant, and’
, a single source of power adapted to move both
inder, a free piston in each of said cylinders, com
prising a motor piston and a compressor piston
arranged on the same side of the motor cylinder
being directly connected .with each other, each
buiîer cylinder being ñxed in alignment with the
corresponding compressor cylinder, a pressure v
said members.
`16. A free piston motor compressor comprising
10
in combination,~ a motor cylinder and at least one
compressor cylinder arranged on either side
conduit for the gas compressed in one compressor 10
cylinder, said pressure conduit being connected`
to'the corresponding- bu‘lïer cylinder near` the
point at which the end face of said buiïer pis
thereof, a free piston in each cylinder, comprising
a motor piston and a compressor piston arranged , ton is located 'before compression isstarted, and
means for varying the fuel supply to said motor
15 on the same side of the motor cylinder being
directly connected with each other, a compressed cylinder in such manner that the length of the
air conduit connected to said compressor cyl- . piston stroke remains substantially constant.
19. A free piston motor compressor comprising
in combination, a motor cylinder, at _least onecompressor cylinder arranged on either side 20
inders, a valve inserted in said conduit and sub
'jected to the discharge pressure of said compres
20 sor, a spring arranged to counteract the discharge
pressure acting on said valve, means for varying thereof and an additional compression cylinder.'
the tension of said spring in dependency from'the f a free piston in each of said cylinders, comprising
pressure prevailing in saidA conduit to the rear of a motor piston and a compressor piston arranged `
-on the same side of the motor cylinder being
said valve and means for varying .the supply of
25 fuel to -said motor cylinder in such manner that
directly connected with each other,`means for 25..
varying one of the initial and end pressures in
said compressor cylinders, and means for at the
tially constant.
17. A free piston motor compressor comprisingv ~ same time varying the supply of fuel to said mo
in combination, a motor cylinder and at least one 4tor cylinder in such manner that the length of 30
the piston stroke remains substantially constant.`
30 compressor cylinder arranged on either side
20. A free piston motor compressor- compris
thereof, a free piston in each cylinder, comprising
a motor piston and a compressor piston arranged ` ing in combination, a motor cylinder, at least one
on the same side of the motor cylinder being compressor cylinder arranged von either> side
directly connected with each other, suction valves thereof and an additional compression cylinder, 35
on said compressor cylinders, a suction conduit a free piston in each of said cylinders, comprising
a motor piston and a compressorvl pistonarranged
communicating with said valves, a pressure con.
duit for the gas compressed in said compressor on the same sideïof the motor -cylinder bein-g ï
>cylinders, means for varying the cross-sectional "directly connected with each other, means for
-varying both the initial and end pressures in said
area of passage of -said suction conduit in de
compressor cylinders, Aand means for at thesame
v4:0 pendency from the pressure in said pressure con
-duit and means for varying the supply of fuel to `time varying the supply of fuel to said motor
said motor cylinder in such manner that the cylinder in such manner that the length of the
the length of the piston ,stroke remains substan
length of the piston stroke remains substantially ‘
constant.
45
.
'Y
"
`
18. A free piston motor compressor comprising
,
piston stroke remains substantially constant.
HERMANN JÄNICKE,
45
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