EP0333960A1 - Hydraulische Arretierungsvorrichtung für einen thermo-hydraulischen Generator - Google Patents

Hydraulische Arretierungsvorrichtung für einen thermo-hydraulischen Generator Download PDF

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Publication number
EP0333960A1
EP0333960A1 EP88400736A EP88400736A EP0333960A1 EP 0333960 A1 EP0333960 A1 EP 0333960A1 EP 88400736 A EP88400736 A EP 88400736A EP 88400736 A EP88400736 A EP 88400736A EP 0333960 A1 EP0333960 A1 EP 0333960A1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
return
main
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88400736A
Other languages
English (en)
French (fr)
Inventor
Henri Mathiolon
Antonio Moretti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR8614780A priority Critical patent/FR2605678B3/fr
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Priority to EP88400736A priority patent/EP0333960A1/de
Publication of EP0333960A1 publication Critical patent/EP0333960A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B71/00—Free-piston engines; Engines without rotary main shaft
    • F02B71/02—Starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • the present invention relates to thermohydraulic generators with free pistons in which the thermal piston is directly associated with a double piston, one of which, during thermal expansion, provides the main pumping with valve box to a main hydraulic battery while the another, reversibly pumping without a valve to another hydraulic battery called "return", ensures the return of the moving element to the thermal compression dead center, any shocks, in this case, being protected by a dash-pot.
  • the thermal piston 1 the cylinder head 2, the fuel injector 3, the intake 4, the transfer 5, the diagram showing for example a two-stroke with lights and pump housing.
  • the light 6 allows the exhaust, the pump housing being noted 7.
  • the central piston 17 of the composite piston 8 slides in the cylinder 10 and delivers without valve in the oleopneumatic accumulator 18, the combined action of the battery 18 and of the piston 17 allowing the thermal piston to return to compression .
  • FIG 2 shows the components 1 to 22 of Figure 1 but it is supplemented with the elements which characterize the invention in the case where the stopping of the machine is controlled.
  • the invention implements the combination of the following means:
  • This operates in reverse of the main, in connection with the cavity 25, which is connected during normal operation of the generator, to the suction 13 of the main pumping by the valve 26 hydraulically controlled by the external pressure which l tackles.
  • fig. 2 shows the components of the invention in the arrangement where the stopping of the machine is controlled.
  • the same valve 26, when controlled as illustrated, carries the cavity 25, therefore the auxiliary pumping cylinder, to the pressure of the "return" accumulator 18 when the valve 26 is served by said pressure.
  • a controlled valve 27 is interposed between the return piston 17 and the return battery 18. It is normally passing under the effect of the pressure of said battery which pushes the main surface of this valve, which compresses the spring. 28 which, without pressure, would close the valve.
  • FIG. 2 shows that this action brings the control of the valve 26 to the same pressure of the return battery, which controls it and puts at this said pressure the cavity 25 of the auxiliary pumping.
  • Two controlled valves 30 and 31 press tank pressure, or very low, respectively the return pumping cylinder 10 and the main valve box 12. They perform these functions when they are controlled, being at rest during operation normal machine. Between the valve 31 and the valve box 12 a calibrated spring 32, whose setting pressure is a little higher than the booster pressure applied to the main suction 13, prevents a loss of hydraulic fluid to the tank when this valve 31 is ordered.
  • Fig. 2 shows the valve 31 at rest because, as will be explained below, its control is only operated at the end of the machine stop stroke.
  • combustion Shortly before the compression neutral point, combustion is established, can contribute to the final braking phase and pushes the moving part towards the trigger by jointly compressing the main cylinder 24 by the piston 11 which inflates the main battery 15 and the return cylinder 18 by the piston 17, in preparation for the following alternation.
  • valve 29 is controlled carrying the cover pressure the control piston of the piloted valve 27 which opens under the action of the pressure of the storage battery.
  • return 18 while the valve 26, which also receives the tank pressure, is in the rest position and connects the auxiliary pumping by its cavity 25 to the main suction 13.
  • This small displacement auxiliary pumping sends small volumes to 13 and these exchanges fade in front of the main suction.
  • valves 30 and 31 close, being at rest, the main and auxiliary cylinders.
  • valve 29 is put to rest from which it follows the pressurization by the return battery 18 of the piston controlled valve 27.
  • the latter under this action, and the parallel action of its spring 28, tend to close progressively.
  • said pressure of the return battery 18 reaches the controlled valve 26, controls it and reaches the cavity 25 of the auxiliary pumping.
  • This contributes to accelerating the return of the moving element to the detent dead center, compensating for the pressure drop and the correlative brake force caused by the control of the valve 27. It is indeed clear that, while being controlled, the valve 27 does not close completely until the end of the expansion stroke of the movable assembly, this at the cost of an overpressure that more than compensates for the action of the return pressure on the auxiliary pumping.
  • the two valves 30 and 31 are controlled carrying, at low pressure, the main and return cylinders, preventing any rebound.
  • the restart being decided, it is obtained by the game of the reverse maneuvers: the valves 30 and 31 are put at rest, which isolates from the tarpaulin the main and auxiliary cylinders, the valve 29 is ordered carrying the tarpaulin piston pressure control of the valve 27 and, at the same time, the valve 26. It follows that, under the action of the return pressure on the thrust ring, the valve 27 opens very quickly while the pressure of the suction 13 is established in the cavity 25 and the auxiliary pumping all conditions which allow the starting of the moving equipment for a sequence of operation.
  • the opening of the valve 27 is so rapid that it practically eliminates the loss of rolling energy and, therefore, the first start can be considered to be comparable to the following.
  • the determining action of the valve 29 on the opening of the valve 27 can be advantageously accelerated by the choice of a two-stage piloted valve as is known.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP88400736A 1986-10-24 1988-03-25 Hydraulische Arretierungsvorrichtung für einen thermo-hydraulischen Generator Withdrawn EP0333960A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8614780A FR2605678B3 (fr) 1986-10-24 1986-10-24 Dispositif d'arret hydraulique pour generateur thermohydraulique
EP88400736A EP0333960A1 (de) 1988-03-25 1988-03-25 Hydraulische Arretierungsvorrichtung für einen thermo-hydraulischen Generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88400736A EP0333960A1 (de) 1988-03-25 1988-03-25 Hydraulische Arretierungsvorrichtung für einen thermo-hydraulischen Generator

Publications (1)

Publication Number Publication Date
EP0333960A1 true EP0333960A1 (de) 1989-09-27

Family

ID=8200367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400736A Withdrawn EP0333960A1 (de) 1986-10-24 1988-03-25 Hydraulische Arretierungsvorrichtung für einen thermo-hydraulischen Generator

Country Status (1)

Country Link
EP (1) EP0333960A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003575A1 (en) * 1994-07-27 1996-02-08 Innas Free Piston B.V. Hydraulic switching valve, and a free-piston engine provided therewith

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1256066A (fr) * 1960-02-03 1961-03-17 Renault Commande de démarrage et d'arrêt d'une machine à pistons libres
FR2441073A1 (fr) * 1978-11-13 1980-06-06 Moiroux Auguste Compresseur a action directe equipe d'un piston monobloc
US4599861A (en) * 1985-05-13 1986-07-15 Beaumont Richard W Internal combustion hydraulic engine
FR2601721A1 (fr) * 1986-07-16 1988-01-22 Renault Dispositif d'arret et de demarrage d'un piston libre
FR2605678A1 (fr) * 1986-10-24 1988-04-29 Renault Dispositif d'arret hydraulique pour generateur thermohydraulique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1256066A (fr) * 1960-02-03 1961-03-17 Renault Commande de démarrage et d'arrêt d'une machine à pistons libres
FR2441073A1 (fr) * 1978-11-13 1980-06-06 Moiroux Auguste Compresseur a action directe equipe d'un piston monobloc
US4599861A (en) * 1985-05-13 1986-07-15 Beaumont Richard W Internal combustion hydraulic engine
FR2601721A1 (fr) * 1986-07-16 1988-01-22 Renault Dispositif d'arret et de demarrage d'un piston libre
FR2605678A1 (fr) * 1986-10-24 1988-04-29 Renault Dispositif d'arret hydraulique pour generateur thermohydraulique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003575A1 (en) * 1994-07-27 1996-02-08 Innas Free Piston B.V. Hydraulic switching valve, and a free-piston engine provided therewith
NL9401232A (nl) * 1994-07-27 1996-03-01 Innas Free Piston Bv Hydraulische schakelklep, alsmede een hiervan voorziene vrije zuiger motor.
US5983638A (en) * 1994-07-27 1999-11-16 Innas Free Piston B.V. Hydraulic switching valve, and a free piston engine provided therewith

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