EP1239137B1 - Piston et cylindre pour un moteur Stirling - Google Patents

Piston et cylindre pour un moteur Stirling Download PDF

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Publication number
EP1239137B1
EP1239137B1 EP02400014A EP02400014A EP1239137B1 EP 1239137 B1 EP1239137 B1 EP 1239137B1 EP 02400014 A EP02400014 A EP 02400014A EP 02400014 A EP02400014 A EP 02400014A EP 1239137 B1 EP1239137 B1 EP 1239137B1
Authority
EP
European Patent Office
Prior art keywords
piston
working
stroke
skirt
stirling engine
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.)
Expired - Lifetime
Application number
EP02400014A
Other languages
German (de)
English (en)
Other versions
EP1239137A2 (fr
EP1239137A3 (fr
Inventor
Andreas Baumüller
Andreas Laug
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.)
Cleanergy AB
Original Assignee
Cleanergy AB
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
Application filed by Cleanergy AB filed Critical Cleanergy AB
Publication of EP1239137A2 publication Critical patent/EP1239137A2/fr
Publication of EP1239137A3 publication Critical patent/EP1239137A3/fr
Application granted granted Critical
Publication of EP1239137B1 publication Critical patent/EP1239137B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2243/00—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes
    • F02G2243/30—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes having their pistons and displacers each in separate cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2244/00—Machines having two pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2244/00—Machines having two pistons
    • F02G2244/02—Single-acting two piston engines
    • F02G2244/06—Single-acting two piston engines of stationary cylinder type
    • F02G2244/10—Single-acting two piston engines of stationary cylinder type having cylinders in V-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2270/00—Constructional features
    • F02G2270/40—Piston assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2270/00—Constructional features
    • F02G2270/45—Piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]

Definitions

  • Stirling engines is particularly advantageous if it is possible to make the service life and service intervals much greater than in conventional gasoline or diesel engines.
  • the invention has for its object to provide a Stirling engine with increased life and larger service intervals.
  • a piston of a Stirling engine with a piston head, with a piston skirt, wherein piston skirt has a lower edge, wherein in the piston skirt at least one annular groove for receiving a piston ring is present, and wherein the piston is coupled via a piston rod, a crosshead and a connecting rod or directly via a connecting rod with a crankshaft, thereby solved in that the distance of the annular groove which is arranged closest to the crankshaft and the lower edge of the piston shaft is between 0.66 x piston stroke and 1.5 x piston stroke, more preferably between 0.9 x piston stroke and 1.1 x piston stroke.
  • This structural design of the piston skirt ensures that the cylinder running surface is completely or almost completely covered by the piston skirt in the region which is swept by the piston ring (s). This improves the heat dissipation.
  • the piston skirt has a sleeve at its end opposite the piston head, so that the length of the piston skirt according to the invention can be achieved by a sleeve which is easy to produce.
  • this embodiment of the invention a per se known piston for a Stirling engine in accordance with the invention can be improved. Since the sleeve, apart from the inertial forces, is not subject to any significant high stresses, it can be made very thin-walled.
  • the Stirling engine according to Fig. 1 has a crankcase 1, in which a crankshaft 3 is rotatably mounted. At a crank pin 5 of the crankshaft 3, a first connecting rod 7 and a second connecting rod 9 are rotatably mounted.
  • the first connecting rod 7 is connected via a first crosshead 10 and a first piston rod 11 with a compression piston 12.
  • the second connecting rod 9 is connected via a second crosshead 13 and a second piston rod 14 with a working piston 15.
  • the structural design of compression piston 12 and piston 15 is in connection with Fig. 1 is not relevant and will therefore not be explained further here.
  • the compression piston 12 runs in a compression cylinder 16, while the working piston 15 is running in a working cylinder 17.
  • the crankshaft 3 and the crank pin 5 are lubricated with oil, while the compression piston 12 and the working piston 15 run dry in the compression cylinder 16 or in the working cylinder 17.
  • the working gas can be pushed back and forth. It takes in the Fig. 1 Not shown working gas when moving from the compression cylinder 16 in the working cylinder 17 heat from a regenerator 21 and heats up to about 650 ° Celsius.
  • the regenerator 21 is generally composed of a packet of wire screens, which in Fig. 1 are not shown in detail.
  • any heat source with a sufficient temperature level can be used as heat source in a Stirling engine, in the exemplary embodiment according to FIG Fig. 1 a burner is used (not shown), which can burn a gaseous or liquid fuel.
  • the so-called high temperature range of the Stirling engine is protected by a thermal insulation 27 against heat loss.
  • FIG. 2 shows a view of a compression piston 12 according to the invention with a first guide band 29, a first piston ring 31 and a second piston ring 33.
  • the guide band 29 serves to guide the compression piston 12 in the cylinder, not shown.
  • the first piston ring 31 and the second piston ring 33 serve to seal the in FIG. 2 located on the left of the piston 12 working space, in FIG. 2 is not shown, to the right of the piston 12 located, also not dargestellen crankcase 1 of the Stirling engine.
  • the guide band 29 and the piston rings 31 and 33 are each received in annular grooves in a known manner.
  • FIG. 2 only the Ring groove 35 of the second piston ring 33 marked with reference lines and a reference numeral.
  • a sleeve 39 is attached to a piston shaft 41 of the piston 12.
  • the sleeve 39 may be more connected to the piston shaft 41 by welding, in particular electron beam welding, pressing, soldering and others.
  • the sleeve 39 has a lower edge 43, which has a to the annular groove 35 with a designated "A" distance. This distance "A” is inventively dimensioned so that it is between 0.66 x piston stroke to 1.5 X piston stroke.
  • the distance "A” in the size according to the invention ensures that the region of the illustrated cylinder running surface swept by the piston rings 29, 31 and 33 is covered during operation by the piston shaft 41 or the sleeve 39 so that no oil is present this area of the cylinder surface can knock down.
  • the precipitation of oil on this area of the cylinder surface is undesirable because parts of this oil precipitate can dissolve in the working gas and then precipitate in the regenerator and char there. This leads to functional impairments of the Stirling engine and reductions in efficiency and performance of the Stirling engine.
  • FIG. 3 an embodiment of a working piston 17 according to the invention is shown in longitudinal section. Some components are given the same reference numbers and only the differences are explained below to avoid repetition.
  • a piston dome 45 is placed above the piston head 37, which reduces the heat transfer between working gas (not shown) and the working cylinder 17.
  • the piston shaft 41 two annular grooves 35 and 47 are inserted.
  • the wide annular groove 47 serves to receive a guide band of Teflon (in Fig. 3 not shown), which assumes the leadership of the working piston 17 in the cylinder, not shown.
  • the annular groove 35 receives a piston ring (not shown), which serves to seal the working space relative to the crankcase.
  • a sleeve 39 is attached to the piston shaft 41.
  • the distance "A" is measured according to the same rules as based on the embodiment according to FIG. 2 explained.
  • FIG. 3 is also an internal thread 49 shown, in which a piston rod, not shown, can be screwed.
  • the long piston shaft 41 also improves the cooling of the piston rings.
  • the inventive design of a piston skirt can also be used in piston compressors for compressing a wide variety of gases. Even with reciprocating compressors, it is namely undesirable that the gases to be compressed absorb oil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Claims (6)

  1. Piston pour un moteur Stirling, doté d'une tête de piston (37), d'un corps de piston (41), le corps de piston (41) présentant un bord inférieur (43), au moins une gorge annulaire (35) étant présente dans le corps de piston (41) afin d'accueillir un segment de piston (33), et le piston étant couplé, par l'intermédiaire d'une tige de piston (11, 14), d'une crosse de tige de piston (10, 13) et d'une bielle (7, 9) ou bien directement par une bielle (7, 9), à un vilebrequin (3), caractérisé en ce que l'écart entre la gorge annulaire (35), qui est montée le plus près du vilebrequin (3), et le bord inférieur (43) du corps de piston (41) se situe entre 0,66 x la course du piston et 1,5 x la course du piston, de manière particulièrement préférée entre 0,9 x la course du piston et 1,1 x la course du piston.
  2. Piston selon la revendication 1, caractérisé en ce que le corps de piston (41) présente un manchon (39) au niveau de son extrémité opposée à la tête de piston (37).
  3. Piston selon la revendication 1 ou 2, caractérisé en ce qu'un dôme de piston (45) est placé sur la tête de piston (37).
  4. Piston selon l'une quelconque des revendications précédentes, caractérisé en ce que le piston est un piston de compression (12).
  5. Piston selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le piston est un piston moteur (13).
  6. Piston selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le piston est un piston de refoulement.
EP02400014A 2001-03-05 2002-03-05 Piston et cylindre pour un moteur Stirling Expired - Lifetime EP1239137B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10110446A DE10110446A1 (de) 2001-03-05 2001-03-05 Kolben und Zylinder für einen Stirling-Motor
DE10110446 2001-03-05

Publications (3)

Publication Number Publication Date
EP1239137A2 EP1239137A2 (fr) 2002-09-11
EP1239137A3 EP1239137A3 (fr) 2003-05-28
EP1239137B1 true EP1239137B1 (fr) 2009-05-27

Family

ID=7676308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02400014A Expired - Lifetime EP1239137B1 (fr) 2001-03-05 2002-03-05 Piston et cylindre pour un moteur Stirling

Country Status (3)

Country Link
EP (1) EP1239137B1 (fr)
AT (1) ATE432413T1 (fr)
DE (2) DE10110446A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102041370B (zh) * 2010-11-12 2012-05-23 江南大学 钢顶铝裙活塞环槽感应强化防自回火装置
SE541815C2 (en) * 2018-01-02 2019-12-17 Maston AB Stirling engine comprising a metal foam regenerator
SE541816C2 (en) * 2018-01-02 2019-12-17 Maston AB A Stirling engine arranged with a gas channel comprising three heat exchangers
SE541814C2 (en) * 2018-01-02 2019-12-17 Maston AB Stirling engine comprising a transition flow element

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR935169A (fr) * 1945-10-29 1948-06-11 Philips Nv Perfectionnements aux machines à piston à gaz chaud
CH347677A (de) * 1956-01-24 1960-07-15 Energy Limited Heissgaskolbenmaschine mit äusserer Heizung
DE2851806A1 (de) * 1978-11-30 1980-06-12 Briggs & Stratton Corp Stirling-kraftmaschine und verfahren zum betreiben einer solchen maschine
JPS5896148A (ja) * 1981-12-02 1983-06-08 Aisin Seiki Co Ltd ガス機関のピストン
US5755100A (en) * 1997-03-24 1998-05-26 Stirling Marine Power Limited Hermetically sealed stirling engine generator

Also Published As

Publication number Publication date
DE50213570D1 (de) 2009-07-09
ATE432413T1 (de) 2009-06-15
DE10110446A1 (de) 2002-09-19
EP1239137A2 (fr) 2002-09-11
EP1239137A3 (fr) 2003-05-28

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