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EP 0 291 545 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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17.04.1991 Bulletin 1991/16 |
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Date of filing: 18.05.1987 |
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Repeating detonation device
Mehrfach Detonationsmaschine
Dispositif de détonation répétée
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Designated Contracting States: |
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AT BE CH DE ES FR GB GR IT LI LU NL SE |
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Date of publication of application: |
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23.11.1988 Bulletin 1988/47 |
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Proprietor: Adams, Joseph S. |
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Ganges B.C. VOS1E0 (CA) |
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Inventor: |
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- Adams, Joseph S.
Ganges B.C. VOS1E0 (CA)
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(74) |
Representative: Spott, Gottfried, Dr. et al |
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Patentanwälte
Spott, Weinmiller & Partner
Sendlinger-Tor-Platz 11 80336 München 80336 München (DE) |
(56) |
References cited: :
FR-A- 2 001 658 US-A- 3 395 688
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FR-A- 2 463 267 US-A- 4 599 861
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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A repeating detonation device
[0001] The present invention relates to a repeating detonation device according to the preamble
of claim 1 and to a method of purging and recharging a detonation chamber of a repeating
detonation device according to the preamble of claim 8.
[0002] A repeating detonation device of that kind is known from US-A-4 599 861. This known
repeating detonation device comprises a detonation chamber, a valved exhaust passageway
from said detonation chamber and a recharging system using a differential free piston
driven by a detonation for reciprocation within a differential cylinder. By this known
device it is possible to rapidly burn a charge of fuel and air and to use the energy
of that detonation to drive, e.g., a hand-operated fastener tool.
[0003] A drawback of this known detonation device, however, lies therein that the power
output of each detonation is not efficient.
[0004] It therefore is the object of the present invention to improve a detonation device
according to the preamble of claim 1 and to improve a method of purging and recharging
a detonation chamber according to the preamble of claim 8 in such a way that efficiency
of detonations can be improved.
[0005] According to the present invention this object is achieved by the advantageous measures
indicated in the characterizing portions of claim 1 and 8, respectively.
[0006] These advantageous measures provide for a very high efficiency of detonation, so
that the power output of each detonation can be increased without increasing fuel
consumption.
[0007] The invention will now be discussed in more detail in the following description with
reference to the accompanying drawings in which:
Fig.1 is a partially schematic, elevational, cross-sectional view of a preferred embodiment
of the invention as applied to a hand-operated fastener driving tool; and
Figures 2-4 are enlarged bottom views of a detonation plate suitable for the device
of FIG. 1 and showing alternative preferred check valve arrangements.
[0008] Tool 10, as shown in FIG. 1, is a hand-held fastener driving tool that conveniently
illustrates a preferred way of applying the present invention to a practical purpose.
However, the invention is not limited to fastener tools and applies to detonation
devices used for other purposes.
[0009] A detonation in detonation chamber 20 of device 10 is accomplished by an ignition
chamber 25 as explained more fully below. But for some fuels and some circumstances,
a detonation in chamber 20 can be initiated by a spark or flame not produced by ignition
chamber 25.
[0010] Tool 10 has a housing 11, a handle 12, a trigger 13, a fastener driver 14, and a
fuel supply 15, all of which are schematically or partially illustrated as conventional
components of a fastener driving tool. The improvement lies in a purging and recharging
system using a differential piston 30 and associated valving and passageways that
cooperate to accomplish effective purging and recharging for rapidly repeating detonations
of improved efficiency.
[0011] Differential piston 30 is a free piston and moves in a differential cylinder having
a smaller bore 31 and a larger bore 32. Differential piston 30 also includes upstanding
sidewalls forming a cylinder, as it were, within the piston. This inner cylinder or
expansion chamber surrounds and is spaced from the wall 21 of detonation chamber 20.
An inside bottom surface 33 of differential piston 30 forms a power piston that is
driven downward by a detonation from chamber 20.
[0012] A one-way seal 34 around an outer surface of differential piston 30 moves in smaller
cylinder 31 to operate as a pump piston. Air is admitted to smaller cylinder 31 via
an opening 35 covered by a one-way check valve 36 that lets air flow into cylinder
31 and blocks air outflow. As pump seal 34 moves downward on a power stroke, air in
smaller cylinder 31 is compressed and escapes past seal 34 toward a plenum 16 in handle
12 where the compressed air is stored for recharging purposes. On a return stroke,
as differential piston 30 moves upward, pump seal 34 draws more air into smaller cylinder
31 via passageway 35 and check valve 36.
[0013] At the upper end of differential piston 30, a seal 37 runs in larger cylinder 32.
Above seal 37 is a displacer piston surface 38, and below seal 37 is a return surface
39. When differential piston 30 is moving downward on a power stroke, displacer 38
draws in purging air via an air inlet opening 40 and a one-way seal 41. This purging
air is drawn into larger cylinder 32 around the outside of detonation chamber wall
21 where it absorbs some heat transmitted through wall 21.
[0014] A seal 42 engaging the inside of differential piston 30 cooperates with seal 37 around
the outside of differential piston 30 so that purging air drawn into larger bore 32
on a power stroke of differential piston 30 is pumped into detonation chamber 20 on
a return stroke. This is possible because of a fluid flow passageway 43 formed between
chamber wall 21 and the inside of differential piston 30 and passageways 44 arranged
inside of seal 42 and having check valves 45.
[0015] A return stroke of differential piston 30 is caused partly by a vacuum that occurs
after a detonation in chamber 20 and partly by recharging air that is compressed in
plenum 16 during a power stroke. The compressed recharging air exerts force on return
surface 39 to lift differential piston 30 to its uppermost position where seal 37
enters into port 47 and disengages from larger cylinder 32. This opens a passageway
around seal 37 and over displacer surface 38 so that compressed recharging air flows
around seal 37 in port 47 and follows the purging air down through passageway 43,
passages 44, and check valves 45 to flow into detonation chamber 20. Such an arrangement
also allows the compressed recharging air to fill chamber 20 with air at more than
atmospheric pressure, which can substantially increase the force of a detonation.
[0016] An exhaust system cooperates with differential piston 30 for exhausting burnt gases
and some of the purging air to keep chamber 20 adequately cool, fully exhausted, and
fully recharged with fresh air. Exhaust valve 50 controls an exhaust passageway 51
and is operated by a diaphragm 52 that is subject to the pressure of the compressed
recharging air in plenum 16 as shown by the broken line arrow. It has been found that
it is desirable to open exhaust valve 50 rapidly at the end of a power stroke so as
to vent exhaust gases and residual heat as quickly as possible. Using the rising pressure
of the recharging air that is compressed in plenum 16 on a power stroke to open exhaust
valve 50 toward the end of a power stroke accomplishes this.
[0017] When exhaust valve 50 opens, a pin 53 extending downward from exhaust valve 50 opens
a check valve 55 covering opening 23 in detonation plate 22. This opens an exhaust
route through valve 55, opening 23, ignition chamber 25, and exhaust passageway 51,
venting both detonation chamber 20 and ignition chamber 25 to exhaust.
[0018] Check valve 55 is loosely mounted on screws 54 and blocks any backflow of fluid or
flame from detonation chamber 20 through opening 23 during a detonation. This improves
the force and efficiency of a detonation. It is believed that this is due to the fact
that ignition in chamber 25 forces some unburned fuel/air mixture into detonation
chamber 20 ahead of a flame jet injected through opening 23. Then when the flame jet
detonates the fuel/air mixture in detonation chamber 20, the force of the detonation
slams check valve 55 closed over opening 23, trapping all the available fuel and air
in chamber 20 for a more forceful detonation. Also, blocking any escape route through
detonation plate 22 by the closure of check valve 55 forces the full detonation energy
through the output from chamber 20 against power piston surface 33.
[0019] Another function of check valve 55 is to divert a flame jet from ignition chamber
25 through opening 23 so that the flame spreads radially outward along detonation
plate 22 toward the periphery of detonation chamber 20. There, a deflector surface
56 directs the radially spreading flame axially of detonation chamber 20 for an effective
ignition.
[0020] An alternative check valve arrangement as shown in FIG. 3 uses three reed valves
57 overlapping each other and covering opening 23 in detonation plate 22. Reed valves
57 not only cooperte to serve as check valves over opening 23, but also divide an
incoming flame jet into three radial segments flowing in the spaces between reed valves
57 and deflected axially of detonation chamber 20 by peripheral deflector surfaces
58.
[0021] Another reed check valve arrangement for detonation plate 22 as shown in FIG. 4 uses
three reed valves 59 covering three openings 24 formed around the periphery of detonation
plate 22. As reed valves 59 are forced open by flames injecting into the detonation
chamber through openings 24, reed valves 59 deflect each flame jet from an axial path
and make the flame jets swirl helically around the periphery of detonation chamber
20 for a fast and effective initiation of a detonation. Reed valves 59 also check
any backflow of fuel or flame through openings 24 during a detonation.
[0022] Piston 60 can be moved in handle 12 by knob 61 for manually pumping up the pressure
of recharging air in plenum 16 for an initial detonation after which detonations can
be repeated automatically and indefinitely. Air enters through opening 35 and check
valve 36 as this occurs.
[0023] Trigger 13 delivers a spark to spark plug 17 in ignition chamber 25 as schematically
shown by a broken line arrow. An arrangement not shown injects fuel from container
15 into ignition chamber 25, also as schematically shown by a broken line arrow.
[0024] The purging and recharging accomplished by differential piston 30 and its associated
valves and passageways assures that adequate air is forced through detonation chamber
20 and ignition chamber 25 to purge exhaust gases and prevent heat build-up. The rapid
action of the exhaust system in response to compressed recharging air cooperates to
help make this possible. The recharging air pumped in by differential piston 30 and
compressed during a power stroke also provides piston return force and ensures an
adequate volume of recharging air, which can be compressed above atomospheric pressure
to improve performance in detonation chamber 20. Fuel injection and spark ignition
then ready tool 10 for an automatically repeatable detonation. Check valving the flame
injection opening through detonation plate 22 not only cooperates with the exhaust
system, but also increases the force of a detonation. This cooperates with the purging
and recharging system to produce a large driving force from a small detonation chamber
to increase the efficiency of the device.
1. A repeating detonation device comprising a detonation chamber (20), a valved exhaust
passageway (51) from said detonation chamber, and a recharging system using a differential
free piston (30) driven by a detonation for reciprocation within a differential cylinder
(31, 32),
characterized in that
[a] said differential cylinder (31, 32) is surrounding said detonation chamber (20)
with an annular space therebetween;
[b] the top of said differential free piston (30) is having upward sidewalls extending
into said annular space, thereby defining an expansion chamber which is communicating
via a restricted opening with said detonation chamber (20) and which is disposed for
reciprocation relative to said detonation chamber (20), said sidewalls affording a
fluid passageway (43-45) around the periphery of said detonation chamber (20), and
said differential free piston (30) being driven by a detonation from said detonation
chamber (20);
[c] said differential free piston is further comprising
[c1] a pumping surface with a valving arrangement (34) which is compressing recharging
air from an extension (31) of said differential cylinder being disposed below said
detonation chamber (20);
[c2] a displacer piston surface (38) at the top of said upward sidewalls which is
drawing cooling and exhaust purging air into said annular space surrounding said detonation
chamber (20) via a valving arrangement at the top of said differential cylinder (31,
32); and
[c3] a return surface which, on a return stroke of said differential free piston (20)
biased by compressed recharging air, is forcing said purging air through said fluid
passageway (43-45) into said detonation chamber (20) and which, upon completion of
said return stroke, is providing combustion air for the next power stroke via an enlarged
part (47) of said differential cylinder (31, 32).
2. A repeating detonation device according to claim 1, characterized in that said detonation chamber (20) is separated from an ignition chamber (25) by a
detonation plate (22) which comprises an opening (23) through which a flame jet can
pass from said ignition chamber (25) toward a peripheral region of said detonation
chamber (20).
3. A repeating detonation device according to claim 2, characterized by a check valve (55) which is arranged for diverting said flame jet from said ignition
chamber (25) toward a peripheral region of said detonation chamber (20).
4. A repeating detonation device according to claim 2, characterized in that said detonation chamber (20) comprises a plurality of openings (24) for admitting
a plurality of said flame jets into said detonation chamber (20).
5. A repeating detonation device according to claim 4, characterized by a check valve system (57; 59) which is arranged for permitting said flame jets to
flow through said openings (24) during ignition, and to block backflow of fluid and
flame from said detonation chamber (20) through said openings (24) to said ignition
chamber (25) during detonation.
6. A repeating detonation device according to claim 5, characterized in that said check valve system (57; 59) is arranged for diverting said flame jets from
said ignition chamber (25) toward a peripheral region (56) of said detonation chamber
(20).
7. A repeating detonation device according to one of the preceding claims, characterized in that an exhaust valve (50) in said valved exhaust passageway (51) includes a diaphragm
(52) which is controlling the opening of said exhaust valve (50) and means for communicating
said compressed recharging air with said diaphragm (52) for controlling said exhaust
valve.
8. A method of purging and recharging a detonation chamber (20) of a repeating detonation
device which comprises a valved exhaust passageway (51) from said detonation chamber,
and a differential piston (30) driven by a detonation for reciprocating within a differential
cylinder (31, 32),
characterized by the following steps:
[a] flowing fluid through an inlet passageway between said detonation chamber (20)
and said differential piston (30) for purging and recharging said detonation chamber
(20);
[b] operating a valving system which cooperates with surfaces of said differential
piston (30) and said differential cylinder (31, 32) in such a way that
[b1] on a power stroke wherein said differential piston (20) is driven by a detonation
from said detonation chamber (20), one side of said differential piston (20) compresses
recharging air and another side of said differential piston (20) draws in purging
air;
[b2] on a return stroke of said differential piston (20) biased by compressed recharging
air, said purging air is forced through said inlet passageway and into said detonation
chamber (20); and
[b3] upon completion of said return stroke, said compressed recharging air flows through
said inlet passageway and into said detonation chamber (20) for recharging said detonation
chamber (20) with air.
9. A method according to claim 8, characterized by the step of opening an exhaust valve in said exhaust passageway from said detonation chamber
(20) in response to compression of said recharging air during an end portion of said
power stroke.
10. A method according to claim 8 or 9, characterized by the step of initiating said detonation by injecting a flame from an ignition chamber (25) through
a detonation plate (22) into said detonation chamber (20).
11. A method according to claim 10, characterized by the step of diverting flame passing through said detonation plate (22) toward a peripheral region
(56) of said detonation chamber (20).
1. Dispositif à détonation à répétition comprenant une chambre de détonation (20), un
passage d'échappement à soupape (51) de la dite chambre de détonation, et un système
de recharge utilisant un piston libre différentiel (30) entraîné par une détonation
pour déplacement alternatif à l'intérieur d'un cylindre différentiel (31, 32),
caractérisé en ce que
[a] le dit cylindre différentiel (31, 32) entoure la dite chambre de détonation (20)
avec un espace annulaire entre eux;
[b] le sommet du dit piston libre différentiel (30) possède des parois latérales dirigées
vers le haut s'étendant dans le dit espace annulaire, définissant ainsi une chambre
de détente qui communique par l'intermédiaire d'une ouverture à étranglement avec
la dite chambre de détonation (20) et qui est prévue pour se déplacer de façon alternative
par rapport à la dite chambre de détonation (20), les dites parois latérales procurant
un passage de fluide (43 à 45) autour de la périphérie de la dite chambre de détonation
(20), et le dit piston libre différentiel (30) étant entraîné par une détonation provenant
la dite chambre de détonation (20);
[c] le dit piston libre différentiel comporte en outre
[c1] une surface de pompage avec un agencement de clapet (34) qui comprime l'air de
recharge provenant d'un prolongement (31) du dit cylindre différentiel disposée en
dessous de la dite chambre de détonation (20);
[c2] une surface de piston déplaceur (38) au sommet des dites parois latérales dirigées
vers le haut qui aspire de l'air de purge d'échappement et de refroidissement dans
le dit espace annulaire entourant la dite chambre de détonation (20) par l'intermédiaire
d'un agencement de clapet au sommet du dit cylindre différentiel (31, 32); et
[c3] une surface de retour qui, lors d'une course de retour du dit piston libre différentiel
(20) rappelé par l'air de recharge comprimé, force le dit air de purge au travers
du dit passage de fluide (43 à 45) dans la dite chambre de détonation (20) et qui,
à la fin de cette course de retour, fournit de l'air de combustion pour la course
motrice suivante par l'intermédiaire d'une partie agrandie (47) du dit cylindre différentiel
(31, 32).
2. Dispositif à détonation à répétition selon la revendication 1, caractérisé en ce que
la dite chambre de détonation (20) est séparée d'une chambre de mise à feu (25) par
une plaque de détonation (22) qui comporte une ouverture (23) à travers laquelle peut
passer un jet de flamme provenant de la dite chambre de mise à feu (25) en direction
d'une zone périphérique de la dite chambre de détonation (20).
3. Dispositif à détonation à répétition selon la revendication 2, caractérisé par un
clapet anti-retour (55) qui est prévu pour détourner le dit jet de flamme provenant
de la dite chambre de mise à feu (25) en direction d'une zone périphérique de la dite
chambre de détonation (20).
4. Dispositif à détonation à répétition selon la revendication 2, caractérisé en ce que
la dite chambre de détonation (20) comprend plusieurs ouvertures (24) destinées à
admettre plusieurs des dits jets de flamme dans la dite chambre de détonation (20).
5. Dispositif à détonation à répétition selon la revendication 4, caractérisé par un
système de clapet anti-retour (57; 59) qui est prévu pour permettre aux dits jets
de flamme de s'écouler au travers des dites ouvertures (24) au cours de la mise à
feu, et pour bloquer le retour de fluide et de flamme depuis la dite chambre de détonation
(20) au travers des dites ouvertures (24) vers la dite chambre de mise à feu (25)
au cours de la détonation.
6. Dispositif à détonation à répétition selon la revendication 5, caractérisé en ce que
le dit système de clapet anti-retour (57; 59) est prévu pour détourner les dits jets
de flamme provenant de la dite chambre de mise à feu (25) en direction d'une zone
périphérique (56) de la dite chambre de détonation (20).
7. Dispositif à détonation à répétition selon l'une des revendications précédentes, caractérisé
en ce que une soupape d'échappement (50) dans le dit passage d'échappement à soupape
(51) comprend un diaphragme (52) qui commande l'ouverture de la dite soupape d'échappement
(50) et des moyens destinés à faire communiquer le dit air de recharge comprimé avec
le dit diaphragme (52) afin de commander la dite soupape d'échappement.
8. Procédé de purge et de recharge d'une chambre de détonation (20) d'un dispositif à
détonation à répétition qui comporte un passage d'échappement à soupape (51) depuis
la dite chambre de détonation, et un piston libre différentiel (30) entraîné par une
détonation pour déplacement alternatif à l'intérieur d'un cylindre différentiel (31,
32),
caractérisé par les étapes suivantes:
[a] écoulement de fluide au travers d'un passage d'admission entre la dite chambre
de détonation (20) et le dit piston différentiel (30) afin de purger et recharger
la dite chambre de détonation (20);
[b] actionnement d'un système de soupape qui coopère avec des surfaces du dit piston
différentiel (30) et du dit cylindre différentiel (31, 32) d'une manière telle que
[b1] lors d'une course motrice dans laquelle le dit piston différentiel (20) est entraîné
par une détonation provenant de la dite chambre de détonation (20), un côté du dit
piston différentiel (20) comprime l'air de recharge et l'autre côté du dit piston
différentiel (20) aspire de l'air de purge;
[b2] lors d'une course de retour du dit piston différentiel (20) rappelé par l'air
de recharge comprimé, le dit air de purge est forcé au travers du dit passage d'admission
et dans la dite chambre de détonation (20); et
[b3] à la fin de la dite course de retour, le dit air de recharge comprimé s'écoule
au travers du dit passage d'admission et dans la dite chambre de détonation (20) afin
de recharger la dite chambre de détonation (20) avec de l'air.
9. Procédé selon la revendication 8, caractérisé par l'étape d'ouverture d'une soupape
d'échappement dans le dit passage d'échappement depuis la dite chambre de détonation
(20) en réponse à la compression du dit air de recharge au cours d'une partie finale
de la dite course motrice.
10. Procédé selon la revendication 8 ou 9, caractérisé par l'étape d'amorçage de la dite
détonation par l'injection d'une flamme provenant d'une chambre de mise à feu (25)
au travers d'une plaque de détonation (22) dans la dite chambre de détonation (20).
11. Procédé selon la revendication 10, caractérisé par l'étape de déviation de la flamme
passant au travers de la dite plaque de détonation (22) en direction d'une zone périphérique
(56) de la dite chambre de détonation (20).
1. Mehrfachdetonationsvorrichtung mit einer Brennkammer (20), einem ventilgesteuerten
Abgaskanal (51) aus der Brennkammer und einem Nachfüllsystem, das einen durch eine
Detonation zur Hin- und Herbewegung innerhalb eines Stufenzylinders (31, 32) angetriebenen
Stufen-Freikolben (30) benutzt,
dadurch gekennzeichnet, daß
[a] der Stufenzylinder (31, 32) die Brennkammer (20) mit einem dazwischenliegenden
ringförmigen Zwischenraum umschließt,
[b] der Kopf des stufen-Freikolbens (30) sich aufwärts in den ringförmigen Zwischenraum
erstreckende Seitenwände aufweist, wodurch ein Schöpfraum abgegrenzt wird, der über
eine begrenzte Öffnung mit der Brennkammer (20) in Verbindung steht und der zur Hin-
und Herbewegung relativ zu der Brennkammer (20) angeordnet ist, wobei die Seitenwände
einen Strömungskanal (43-45) um die Außenfläche der Brennkammer (20) herum bilden
und der Stufen-Freikolben (30) durch eine Detonation aus der Brennkammer (20) angetrieben
wird, und
[c] der Stufen-Freikolben zudem
[c1] eine Pumpoberfläche mit einer Ventilanordnung (34), die Nachfülluft aus einer
Verlängerung (31) des Stufenzylinders unterhalb der Brennkammer (20) verdichtet,
[c2] eine Verdrängerkolbenoberfläche (38) an der Spitze der sich aufwärts erstreckenden
Seitenwände, die über eine Ventilanordnung an der Spitze des Stufenzylinders (31,
32) Kühl- und Abgas-Reinigungsluft in den die Brennkammer (20) umschließenden ringförmigen
Zwischenraum einzieht, und
[c3] eine Rückgangsoberfläche aufweist, die bei einem Kolbenrückgang des Stufen-Freikolbens
(30) aufgrund der verdichteten Nachfülluft die Reinigungsluft durch den Strömungskanal
(43-45) in die Brennkammer (20) drückt und die nach Beendigung des Kolbenrückgangs
Verbrennungsluft für den nächsten Arbeitshub über einen vergrößerten Abschnitt (47)
des Stufenzylinders (31, 32) liefert.
2. Mehrfachdetonationsvorrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß
die Brennkammer (20) von einer Zündkammer (25) durch ein Detonationsblech (22) getrennt
ist, das eine Öffnung (23) aufweist, durch die ein Flammenstrahl aus der Zündkammer
(25) zu einem Wandungsabschnitt der Brennkammer (20) gelangen kann.
3. Mehrfachdetonationsvorrichtung nach Anspruch 2,
gekennzeichnet durch
ein Rückschlagventil (55), das zum Umlenken des Flammenstrahls aus der Zündkammer
(25) zu einem Wandungsabschnitt der Brennkammer (20) angeordnet ist.
4. Mehrfachdetonationsvorrichtung nach Anspruch 2,
dadurch gekennzeichnet, daß
die Brennkammer (20) eine Vielzahl von Öffnungen (24) zum Einlaß einer Vielzahl von
Flammenstrahlen in die Brennkammer (20) aufweist.
5. Mehrfachdetonationsvorrichtung nach Anspruch 4,
gekennzeichnet durch
ein Rückschlagventilsystem (57; 59), dessen Anordnung zuläßt, daß während einer Zündung
die Flammenstrahlen durch die Öffnungen (24) strömen, und verhindert, daß während
einer Detonation Fluid und Flammen aus der Brennkammer (20) durch die Öffnungen (24)
in die Zündkammer (25) zurückströmen.
6. Mehrfachdetonationsvorrichtung nach Anspruch 5,
dadurch gekennzeichnet, daß
das Rückschlagventilsystem (57; 59) zum Umlenken des Flammenstrahls aus der Zündkammer
(25) zu einem Wandungsabschnitt (56) der Brennkammer (20) angeordnet ist.
7. Mehrfachdetonationsvorrichtung nach einem der vorstehenden Ansprüche,
dadurch gekennzeichnet, daß
ein Abgasventil (50) in dem ventilgesteuerten Abgaskanal (51) eine Membran (52), die
die Öffnung des Abgasventils (50) steuert, und eine Einrichtung enthält, die zum Steuern
des Abgasventils die verdichtete Nachfülluft mit der Membran (52) verbindet.
8. Verfahren zum Reinigen und Nachfüllen einer Brennkammer (20) einer Mehrfachdetonationsvorrichtung,
die einen ventilgesteuerten Abgaskanal (51) aus der Brennkammer und einen durch eine
Detonation zur Hin- und Herbewegung innerhalb eines Stufenzylinders (31, 32) angetriebenen
Stufen-Freikolben (30) umfaßt,
gekennzeichnet durch die folgenden Schritte:
[a] Fluid durch einen Einlaßkanal zwischen der Brennkammer (20) und dem Stufenkolben
(30) zum Reinigen und Nachfüllen der Brennkammer (20) strömen zu lassen, und
[b] ein Ventilsystems zu betreiben, das mit Oberflächen des Stufenkolbens (30) und
des Stufenzylinders (31, 32) derart zusammenwirkt, daß
[b1] durch einen Arbeitshub, bei dem der Stufenkolben (30) durch eine Detonation aus
der Brennkammer (20) angetrieben wird, eine Seite des Stufenkolbens (30) Nachfülluft
verdichtet und eine andere Seite des Stufenkolbens (30) Reinigungsluft einzieht,
[b2] durch einen Rückgang des Stufenkolbens (30) aufgrund der verdichteten Nachfülluft
die Reinigungsluft durch den Einlaßkanal und in die Brennkammer (20) gedrückt wird,
und
[b3] bei Beendigung des Rückgangs die verdichtete Nachfülluft zum Nachfüllen der Brennkammer
(20) mit Luft durch den Einlaßkanal und in die Brennkammer (20) strömt.
9. Verfahren nach Anspruch 8,
gekennzeichnet durch den Schritt,
ein Abgasventil in dem Abgaskanal aus der Brennkammer (20) unter Bezug auf die Verdichtung
der Nachfülluft während eines Endabschnitts des Arbeitshubs zu öffnen.
10. Verfahren nach Anspruch 8 oder 9,
gekennzeichnet durch den Schritt,
die Detonation mittels Einspritzen einer Flamme aus der Zündkammer (25) durch ein
Detonationsblech (22) in die Brennkammer (20) einzuleiten.
11. Verfahren nach Anspruch 10,
gekennzeichnet durch den Schritt,
die durch das Detonationsblech (22) tretende Flamme zu einem Wandungsabschnitt (56)
der Brennkammer (20) zu lenken.