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EP1925873B1 - Behälter zum Lagern von Flüssigkeiten unter Hochdruck, insbesondere eines Gases zum Betanken eines Kraftfahrzeugmotors und Verfahren zu seiner Herstellung - Google Patents

Behälter zum Lagern von Flüssigkeiten unter Hochdruck, insbesondere eines Gases zum Betanken eines Kraftfahrzeugmotors und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP1925873B1
EP1925873B1 EP06425803A EP06425803A EP1925873B1 EP 1925873 B1 EP1925873 B1 EP 1925873B1 EP 06425803 A EP06425803 A EP 06425803A EP 06425803 A EP06425803 A EP 06425803A EP 1925873 B1 EP1925873 B1 EP 1925873B1
Authority
EP
European Patent Office
Prior art keywords
terminal region
tank
portions
area
defining
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.)
Not-in-force
Application number
EP06425803A
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English (en)
French (fr)
Other versions
EP1925873A1 (de
Inventor
Massimo Di Pardo
Michele Iammarino
Sergio Paolasini
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.)
Centro Ricerche Fiat SCpA
Original Assignee
Centro Ricerche Fiat SCpA
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 Centro Ricerche Fiat SCpA filed Critical Centro Ricerche Fiat SCpA
Priority to DE602006004368T priority Critical patent/DE602006004368D1/de
Priority to AT06425803T priority patent/ATE418041T1/de
Priority to EP06425803A priority patent/EP1925873B1/de
Priority to PCT/IB2007/002337 priority patent/WO2008062261A1/en
Priority to CN200780010199.4A priority patent/CN101405536B/zh
Publication of EP1925873A1 publication Critical patent/EP1925873A1/de
Application granted granted Critical
Publication of EP1925873B1 publication Critical patent/EP1925873B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/005—Storage of gas or gaseous mixture at high pressure and at high density condition, e.g. in the single state phase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/056—Small (<1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0639—Steels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2172—Polishing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2181—Metal working processes, e.g. deep drawing, stamping or cutting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/036—Very high pressure (>80 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/011—Improving strength
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
    • F17C2270/0178—Cars

Definitions

  • the present invention relates to tanks for storing fluids at operating pressures higher than 100 bar, such as gas for fuelling a motor-vehicle engine, and to a method for the production of tanks of the type referred to.
  • Such a tank is known from document WO 99/47850 .
  • Tanks of the type referred to comprise a body defining a hermetic chamber for containing the pressurized fluid. Rigidly associated to said body is at least one valve, suitable for enabling both charging of the aforesaid chamber with the fluid in order to fill the tank, and drawing-off of the fluid from the tank to enable its use. Said tanks find application in various sectors, amongst which of particular importance is the automobile sector, for the purpose of storage, at pressures in the region of 200-300 bar, of methane gas or hydrogen that is to fuel the internal-combustion engine of a vehicle.
  • the bodies of high-pressure gas tanks currently used in the automobile sector are made of steel on account of the relatively contained cost of said material and its solidity.
  • other types of cylinders that can be used as high-pressure gas tanks such as ones made of composite material, but their very high cost prevents diffusion thereof in the automobile sector.
  • the steels used for the construction of the bodies of pressurized-gas tanks referred to are high-carbon steels in so far as they are the only ones suitable for guaranteeing the necessary safety in terms of strength.
  • the steel "34CrMo4" is universally adopted by manufacturers of cylinders used as high-pressure tanks in the automobile sector.
  • Lowalloy steels or low-carbon steels are not instead deemed suitable for application in the case of high gas pressures, as in automobile use, on account of the low mechanical characteristics.
  • the bodies of high-pressure tanks of a known type are produced in a single piece made of high-alloy steel, with techniques characterized by the absence of any welding process.
  • the body of the tank is built starting from a billet or a thick plate, using hot-pressing techniques, to form a hollow body with an end that must be closed.
  • the body of the tank is obtained starting from a tube, in which case both of its ends must be closed. Closing of the end of the body (in the case of a mechanical process starting from a billet or a thick plate) or of both of its ends (in the case of a mechanical process starting from a tube) is obtained via fluoforming, which consists in progressive hot deformation so as to bring up together the areas to be closed.
  • the aim of the present invention is to overcome one or more of the drawbacks referred to above, and in particular to:
  • the aforesaid aims are achieved according to the invention by a method for the fabrication of a tank for storing a fluid at operating pressures higher than 100 bar, in particular a gas for fuelling a motor-vehicle engine, having the characteristics of Claim 11.
  • the reference number 1 designates as a whole a cylinder of a known type for storing a fluid at high pressure.
  • the cylinder 1 is of the type commonly used as fuel tank of a motor vehicle for containing methane gas at a pressure ranging between approximately 200 bar and approximately 300 bar, necessary for supplying an internal-combustion engine.
  • the cylinder 1 has a body 2 having a bottom portion 3, an intermediate portion 4, and a head portion 5.
  • the bottom portion 3 has a substantially flattened shape
  • the intermediate portion 4 has a generally hollow cylindrical shape
  • the head portion 5 has a substantially hemispherical or cap-like shape.
  • the shape illustrated in Figure 1 is the one typical of the case where the body 2 is obtained in a single piece, via hot pressing of a steel billet or a thick steel plate, to form first of all the portions 3 and 4.
  • the portion 5 is then obtained via fluoforming by deforming an end part of the intermediate portion 4.
  • the intermediate portion 4 of the body 2 can be obtained starting from a tube, in which case both of the ends of the latter are shaped like a hemispherical cap via fluoforming.
  • the reference number 6 designates a valve, made in a way in itself known and provided to enable both charging of the cylinder 1 with methane gas, in the case of refuelling, and drawing of the gas from the cylinder in order to supply the engine of the motor vehicle.
  • the valve 6 is connected to suitable pipes for charging and drawing-off of the gas (not represented).
  • a threaded part of the former is screwed in a through hole provided with internal screw on the top of the head portion 5.
  • valve 6 projects from the body 2, in a position aligned with the axis of the latter. Said arrangement derives from the need to position the valve 6 in a point where the thickness of the body 2 is large, to be able to provide therein a sufficiently long threaded through hole such as to guarantee a secure anchorage of the valve 6.
  • the process of fluoforming used for providing the head part 5 enables a sufficiently thick area of anchorage of the valve 6 for said purpose to be obtained.
  • Such an embodiment presents the drawback that, on account of said technique of formation of the body 2, the valve 6 can be located only in a position corresponding to the top of the portion 5, to project from the latter. This has adverse effects on the overall dimensions of the cylinder 1 since the valve 6 must, for normative reasons, be kept at a certain distance from possible surfaces of impact. Consequently, the useful space that can be occupied by the body 2 is smaller, a fact that jeopardizes its capacity for storage of gas.
  • the degree of safety and the storage capacity of the tank are increased by a particular modelling of the body of the cylinder, and in particular of one of its ends, in order to make available the respective valve in a safer or more protected position.
  • the end of the body of the cylinder to which the respective valve is fixed is not modelled via fluoforming.
  • Figures 2 to 6 represent a possible embodiment of a tank for storing fluids at operating pressures higher than 100 bar according to the present invention, said body being formed starting from a single piece, and being provided, in a position corresponding to a terminal region thereof - herein conventionally defined as "head region" -, with portions with thickened walls arranged with central symmetry with respect to the axis of the body, made in at least one of which is the hole in which the valve is fixed.
  • the tank according to the invention designated as a whole by 11, has a body 12, in which an intermediate hollow region, designated by 14, and two terminal regions 13 and 15 are identified, which form the bottom and the head of the body 12, respectively.
  • the intermediate region 14 is substantially cylindrical in shape, whilst the bottom terminal region 13 is as a whole cup-shaped; in particular, it has the shape of a hemispherical cap.
  • the head region 15 has, instead, a more flattened configuration.
  • the body 12 is made of hardened and tempered steels with high equivalent carbon content having ultimate strengths comprised between 800 and 1200 MPa (such as, for instance chromium-manganese or chromium-molybdenum steels, or high-strength steels, for example, 34CrMo4).
  • the valve 6 is fixed to the head terminal region 15 in a lateral position, said possibility of positioning being allowed on account of a particular conformation of the region itself.
  • FIG. 3 Visible in Figure 3 is the internal part of just the terminal region 15, and represented in Figures 4 , 5 and 6 are cross-sectional views of the same region, respectively according to three different mutually orthogonal planes. It should be noted that in said figures, for greater clarity, the representation of the valve 6 has been omitted.
  • the portions 16 are of dimensions such as to enable formation of an internal thread 17, or other type of through hole, in the desired position and of the desired length. Screwed into said hole is the threaded fixing part of the valve 6 of Figure 2 , the remaining connection part of the valve remaining, instead, on the outside of the body 12.
  • a first area 16a defines a substantially plane seat, which is made in a position corresponding to the hole 17 and has maximum thickness, with reference to a direction orthogonal to the central axis X of the body 12.
  • a second area 16b defines a first area of radiusing around the aforesaid first area 16a
  • a third area 16c defines a second area of radiusing around the aforesaid first and second areas 16a, 16b.
  • the area 16c extends, on one side, towards the intermediate region 14 and, on the opposite side, towards the end of the terminal region 15, radiusing thereto in a continuous way.
  • the first and second radiusing areas, respectively of the second and third areas 16b, 16c have curvatures of opposite sign.
  • the external side of the latter has, in a position corresponding to the first area 16a, a corresponding plane external region 16a'.
  • first, second and third areas 16a, 16b and 16c have characteristic dimensions that define globally a specific geometry thereof. Said dimensions are listed hereinafter:
  • the minimum side of the first area 16a must be greater than the diameter of the hole 17, preferably at least approximately 7% - 8% greater than the aforesaid diameter. In the case where, for example, the hole 17 has a diameter of 26 mm, the minimum side will be approximately 28 mm.
  • the body 12 of the tank or cylinder according to the present invention can be obtained in a simple and fast way via pressing from a steel billet of the type previously referred to, in so far as said technology is well suited to the complexity of the profile of the portions 16.
  • the embodiments according to the invention previously described enable improvement of the functionality of tanks that are to contain gas at high pressure, at operating pressures higher than 100 bar, on account of the possibility of placing the valve 6 in positions that have a positive impact both on the safety - in so far as the valve is more protected in the case of impact - and on the capacity for storage of fuel in the presence of an increase in exploitable volume for housing the tank body.
  • Figures 13A and 13B illustrate, respectively, the case of housing in said boot of a tank 11 according to the embodiment of Figure 2 , and of a tank 1 according to the known art appearing in Figure 1 .
  • L designates the maximum axial or longitudinal dimensions of the two tanks.
  • the longitudinal encumbrance of the tank 11 appearing in Figure 13A may be greater than that of the tank 1 appearing in Figure 13B thanks to the different position of the valve 6.
  • valve 6 can be positioned in areas of the bodies that are in any case safe.
  • valve 6 envisaged according to the invention is strictly linked to the conformation of the body 12 and in particular to the presence of the thickened portions 16.
  • the portions 16 lead to a strengthening of the side area of the head terminal region 15 so as to enable formation of the hole 17 for fixing the valve 6.
  • the present invention also envisages the possible presence of more than two portions with thickened walls 16, with the condition that they are arranged with central symmetry with respect to the axis X of the body 12 so as to distribute the circumferential stresses evenly over the cross sections of the body 12.
  • the body 12 of the tank 11 is obtained starting from a single piece, in this case a billet of high-alloy steel.
  • Figure 7 illustrates a step of pre-forming in which the billet, designated by 20, is compressed under a press 21 for the purpose of obtaining a pre-form.
  • a first step of forging is carried out, illustrated in Figure 8 , in which the pre-form is inserted in a die 22 and pressed by a counter-die 23 to obtain a form 20b having a longitudinal cross section with a substantially cup-shaped profile, the bottom end of which will define the head terminal region 15 of the body 12.
  • a second forging step is carried out that envisages the use of a second counter-die 23', visible in Figure 9 .
  • the counter-die 23' has two surface cavities 23b' diametrally opposite with respect to a central axis of the die and counter-die, and defining the matrix of the thickened portions 16.
  • the cavities 23b have a first area, a second area, and a third area, corresponding, respectively, to the first, second and third areas of the thickened portions 16.
  • the aforesaid areas of the counter-die are characterized by dimensions corresponding to those defined for the portions 16, which, in the case of the embodiment described above, are linked to one another according to the relations given previously.
  • a form 20c is obtained, which defines, at the bottom (as viewed in Figure 10 ), the head terminal region 15 provided laterally with the thickened portions 16.
  • the form 20c is drawn and coined so as to make a form 20d provided also with the hollow intermediate region 14.
  • the part of the form 20c that extends, at the top, to the thickened portions 16 is plastically deformed under the action of forces impressed by rollers 24 that stretch the aforesaid part.
  • the form 20c is thus lengthened until a volume substantially equal to that of the body 12 of the tank 11 is obtained.
  • the form 20d obtained by drawing undergoes a process of sand-blasting, which consists in smoothing the walls with a jet of sand and water under pressure.
  • the drawn product, represented by the form 20d is checked dimensionally and via visual inspection to detect the presence of possible irregularities of the structure that might be capable of impairing the mechanical properties of the finished tank.
  • the form 20d is closed via the formation of the bottom region 13 according to modalities in themselves known. Specifically, said step envisages setting in rotation the form 20d, which is heated in a position corresponding to its open end and on which a roller 25 acts in such a way as to curve the wall 20d' defining said end in order to form the hemispherical cap that distinguishes the bottom terminal region 13.
  • one of the portions 16 is perforated and, the hole 17 made is threaded internally for the purpose of receiving the threaded stem of the valve 6.
  • valves for one and the same cylinder, for example the one for charging the fluid and the other for drawing it off.
  • Each of said valves would be located in a position corresponding to a respective portion 16 provided with a threaded hole 17, as previously described, the two valves projecting, then, from the two opposite sides of one and the same head terminal region 15.
  • the invention has been described with particular reference to the construction of tanks or cylinders for application in the automobile sector, but it is clear that it may also be used in any other field that presents the same specific problems, in particular ones due to the need to guarantee an adequate mechanical sturdiness at operating pressures higher than 100 bar.
  • the tanks outlined previously has been described with reference to the storage of methane gas, it is clear that they are to be understood as being suitable for storing any other fluid at operating pressures higher than 100 bar, and in particular substantially comprised between 200 and 300 bar.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Claims (15)

  1. Tank zum Aufbewahren eines Fluids für den Antrieb einer Kraftfahrzeug-Brennkraftmaschine bei einem Betriebsdruck, der höher ist als 100 bar und insbesondere zwischen 200 bar und 300 bar liegt, enthaltend:
    einen Körper, der das Fluid (12) aufnimmt und aus einem einzigen Werkstück ausgebildet ist, wobei der Körper einen Kopfabschlussbereich (13), der ein Kopfende definiert, einen Bodenabschlussbereich (13), der ein Bodenende definiert, und einen Zwischenbereich (14) zwischen dem Kopfabschlussbereich (15) und dem Bodenabschlussbereich (13) enthält, wobei das Bodenende und das Kopfende eine Achsabmessung (L) der Ausdehnung des Körpers (12) begrenzen;
    eine Ventilvorrichtung (6) zum Befüllen des Körpers (12) mit dem Fluid und/oder Ablassen des Fluids aus dem Körper (12), wobei die Vorrichtung (6) einen Befestigungsabschnitt, der wirkungsmäßig in eine Durchgangsöffnung (17), die in einer Wand des Körpers (12) ausgebildet ist, eingefügt und dort arretiert ist, sowie einen Verbindungsabschnitt aufweist, der von der Wand auf der Außenseite des Körpers (12) hervorsteht,
    wobei der Tank dadurch gekennzeichnet ist, dass der Körper (12) am Kopfabschlussbereich (15) Abschnitte mit verdickten Wänden (16) aufweist, die punktsymmetrisch im Bezug auf eine Achse (X) des Körpers (12) angeordnet sind, wobei die Durchgangsöffnung (17) in wenigstens einer der verdickten Wandabschnitte (16) ausgebildet ist.
  2. Tank nach Anspruch 1, dadurch gekennzeichnet, dass die Abschnitte mit den verdickten Wänden durch zwei Abschnitte (16) ausgebildet sind, die seitlich dem Körper (12) zugewandt sind und diametral gegenüberliegend im Bezug auf die Mittelachse (X) angeordnet sind.
  3. Tank nach Anspruch 1, dadurch gekennzeichnet, dass das einzige Werkstück aus Stahl besteht, der aus der Gruppe gewählt ist, die aus gehärteten und vergüteten Stählen mit einem hohen äquivalenten Kohlenstoffgehalt besteht, deren Bruchfestigkeit zwischen 800 und 1.200 MPa liegt.
  4. Tank nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Kopfabschlussbereich (15) und der Bodenabschlussbereich (13) eine im wesentlichen schalenförmige Gestalt haben, die für den Kopfabschlussbereich (15) im allgemeinen abgeflacht und für den Bodenabschlussbereich (13) im wesentlichen halbkugelförmig ist, und der Zwischenbereich (14) eine im wesentlichen zylindrische Form hat.
  5. Tank nach Anspruch 1, dadurch gekennzeichnet, dass die Abschnitte (16) enthalten:
    - einen ersten Bereich (16a), der einen im wesentlichen ebenen Sitz definiert und eine maximale Dicke hat, und in dem die Durchgangsöffnung (17) ausgebildet ist;
    - einen zweiten Bereich (16b), der einen ersten Bereich einer Rundung definiert und den ersten Bereich (16a) umgibt; und
    - einen dritten Bereich (16c), der einen zweiten Bereich einer Rundung definiert und den ersten sowie den zweiten Bereich (16, 16b) umgibt.
  6. Tank nach Anspruch 5, dadurch gekennzeichnet, dass der zweite und der dritte Rundungsbereich (16b, 16c) Krümmungen mit einem entgegengesetzten Vorzeichen haben.
  7. Tank nach Anspruch 6, dadurch gekennzeichnet, dass:
    - die verdickten Abschnitte (16) eine erste und eine zweite charakteristische Abmessung (A, B) aufweisen, die die Breite bzw. die Höhe eines vorderen Vorsprungs der verdickten Abschnitte (16) definieren;
    - der zweite Bereich (16b) eine dritte charakteristische Abmessung (R1) aufweist, die einen ersten Radius einer Rundung definiert;
    - der dritte Bereich (16c) eine vierte charakteristische Abmessung (R2) aufweist, die einen zweiten Radius einer Rundung definiert;
    wobei die charakteristischen Abmessungen (A, B, R1 und R2) gemäß den folgenden Beziehungen miteinander korrelieren, wobei D der Durchmesser des Tanks ist:
    - die erste Abmessung (A) hat einen Wert, der zwischen 0,45 und 0,51 von D liegt und vorzugsweise etwa 0,48 von D beträgt;
    - die zweite Abmessung (B) hat einen Wert, der zwischen 0,4 und 0,5 von D liegt und vorzugsweise etwa 0,45 bis etwa 0,48 von D beträgt;
    - die dritte Abmessung (R1) hat einen Wert, der zwischen 0,1 und 0,2 von D liegt und vorzugsweise 0,13 von D beträgt; und
    die vierte Abmessung (R2) ist größer oder gleich 10 mm, vorzugsweise größer gleich etwa 15 mm.
  8. Tank nach Anspruch 1, dadurch gekennzeichnet, dass der Körper (12) aus einem einzigen Werkstück besteht, das aus einem Stahlrohling stammt.
  9. Tank nach Anspruch 2, dadurch gekennzeichnet, dass der Verbindungsabschnitt (6B) der Vorrichtung (6) seitlich vom Körper (12) im Bezug auf die Längsausdehnung des letztgenannten hervorragt.
  10. Tank nach Anspruch 5, dadurch gekennzeichnet, dass der Körper (12) auf seiner Außenseite an einer Position, die dem ersten Bereich (16a) entspricht, einen entsprechenden ebenen Außenbereich (16a') hat.
  11. Verfahren zur Herstellung eines Tanks für die Aufbewahrung eines Betriebsfluids bei einem Druck größer als 100 bar, insbesondere eines Gastanks zum Antreiben einer Kraftfahrzeug-Brennkraftmaschine, wobei das Verfahren folgende Schritte enthält:
    - Bereitstellen eines länglichen, hohlen Körpers (12), der aus Stahl besteht, mit einem Kopfabschlussbereich (15), der ein Kopfende bildet, einem Bodenabschlussbereich (13), der ein Bodenende definiert, und einem Zwischenbereich (14) zwischen dem Kopfabschlussbereich (15) und dem Bodenabschlussbereich (13);
    - Bereitstellen einer Ventilvorrichtung (6) mit einem Befestigungsabschnitt und einem Verbindungsabschnitt;
    - Befestigen der Ventilvorrichtung (6) am Körper (12) durch Einfügen und Arretieren des Befestigungsabschnittes in eine Durchgangsöffnung (17), die am Körper (12) ausgebildet ist, mit dem Verbindungsabschnitt, der an der Außenseite des Körpers (12) hervorsteht;
    wobei der Körper (12) aus einem einzigen Stahlstück ausgebildet wird und folgende Vorgänge vorgesehen sind:
    a) Ausführen eines ersten Schmiedevorgangs an dem einzigen Werkstück mit einem ersten Oberstempel (23), um eine erste Form (20b) zu erhalten, die einen länglichen Querschnitt mit einem im wesentlichen schalenförmigen Profil hat, in dem der Kopfabschlussbereich (15) zu erkennen ist;
    b) einen Schritt des Tiefziehens des einzigen Werkstücks, enthaltend die plastische Verformung eines Endbereiches des Werkstücks gegenüberliegend zum Kopfabschlussbereich, wobei der Endbereich gestreckt wird, um eine weitere Form (20d) zu erhalten, die den Zwischenbereich (14) aufweist;
    c) einen Schritt des Verschließens durch Warmverformung, ausgeführt an der weiteren Form (20d), wobei dieser Schritt eine örtliche Erwärmung des einzigen Werkstücks und dessen Verformung beinhaltet, um den Bodenabschlussbereich (13) zu erhalten,
    wobei das Verfahren dadurch gekennzeichnet ist, dass:
    vor dem Vorgang b) ein zweiter Schmiedevorgang an dem einzigen Werkstück mit Hilfe eines zweiten Oberstempels (23') ausgeführt wird, um eine zweite Form (20c) zu erhalten, die Abschnitte mit verdickten Wänden (16) im Kopfabschlussbereich (15) aufweist, wobei der zweite Oberstempel (23') Aussparungen oder Oberflächenvertiefungen (23b') enthält, die die Matrix der verdickten Abschnitte (16) definieren, wobei die Abschnitte mit verdickten Wänden punktsymmetrisch im Bezug auf eine Achse (X) der zweiten Form (20c) angeordnet sind,
    und die Durchgangsöffnung (17) in einer Position entsprechend einem der Abschnitte mit den verdickten Wänden (16) ausgebildet wird, um darin die Ventilvorrichtung (6) zu befestigen.
  12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, dass es vor dem Vorgang c) einen Sandstrahlschritt enthält, bei dem die weitere Form (20d) einem Strahl aus Sand und Wasser unter Druck ausgesetzt wird, um deren Wände zu glätten.
  13. Verfahren nach Anspruch 11, dadurch gekennzeichnet, dass der Vorgang c) umfasst:
    - Versetzen der weiteren Form (20d) in eine Drehung; und
    - Verwenden von Walzen (25) zur Verformung des einzigen Körpers.
  14. Verfahren nach Anspruch 11, dadurch gekennzeichnet, dass der Stahl aus der Gruppe gewählt ist, die aus gehärteten und vergüteten Stählen mit einem hohen äquivalenten Kohlenstoffgehalt und hochfesten Stählen besteht.
  15. Tank zum Aufbewahren eines Fluids bei hohem Druck, insbesondere eines Gases zum Antreiben einer Kraftfahrzeug-Brennkraftmaschine, enthaltend einen Körper (12), bestehend aus gehärteten und vergüteten Stählen mit einem hohen äquivalenten Kohlenstoffgehalt oder einem hochfesten Stahl, ausgebildet durch das Verfahren gemäß wenigstens einem der Ansprüche 11 bis 13.
EP06425803A 2006-11-24 2006-11-24 Behälter zum Lagern von Flüssigkeiten unter Hochdruck, insbesondere eines Gases zum Betanken eines Kraftfahrzeugmotors und Verfahren zu seiner Herstellung Not-in-force EP1925873B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE602006004368T DE602006004368D1 (de) 2006-11-24 2006-11-24 Behälter zum Lagern von Flüssigkeiten unter Hochdruck, insbesondere eines Gases zum Betanken eines Kraftfahrzeugmotors und Verfahren zu seiner Herstellung
AT06425803T ATE418041T1 (de) 2006-11-24 2006-11-24 Behälter zum lagern von flüssigkeiten unter hochdruck, insbesondere eines gases zum betanken eines kraftfahrzeugmotors und verfahren zu seiner herstellung
EP06425803A EP1925873B1 (de) 2006-11-24 2006-11-24 Behälter zum Lagern von Flüssigkeiten unter Hochdruck, insbesondere eines Gases zum Betanken eines Kraftfahrzeugmotors und Verfahren zu seiner Herstellung
PCT/IB2007/002337 WO2008062261A1 (en) 2006-11-24 2007-08-07 Tank for storing fluids at high pressures, in particular a gas for fuelling a motor vehicle engine, and manufacturing method thereof
CN200780010199.4A CN101405536B (zh) 2006-11-24 2007-08-07 用于存储尤其是为机动车辆发动机提供燃料的气体的高压流体的罐及其制造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425803A EP1925873B1 (de) 2006-11-24 2006-11-24 Behälter zum Lagern von Flüssigkeiten unter Hochdruck, insbesondere eines Gases zum Betanken eines Kraftfahrzeugmotors und Verfahren zu seiner Herstellung

Publications (2)

Publication Number Publication Date
EP1925873A1 EP1925873A1 (de) 2008-05-28
EP1925873B1 true EP1925873B1 (de) 2008-12-17

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EP06425803A Not-in-force EP1925873B1 (de) 2006-11-24 2006-11-24 Behälter zum Lagern von Flüssigkeiten unter Hochdruck, insbesondere eines Gases zum Betanken eines Kraftfahrzeugmotors und Verfahren zu seiner Herstellung

Country Status (5)

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EP (1) EP1925873B1 (de)
CN (1) CN101405536B (de)
AT (1) ATE418041T1 (de)
DE (1) DE602006004368D1 (de)
WO (1) WO2008062261A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB482142A (en) * 1936-10-10 1938-03-24 Harold Dickinson Brunton Improvements in and relating to containers for fluids under pressure
GB1558409A (en) * 1977-10-06 1980-01-03 Boc Ltd Fluid storage vessels
DE19812904C2 (de) * 1998-03-18 2000-02-03 Mannesmann Ag Vorrichtung zum Speichern von Druckgas
CA2384915C (en) * 2001-05-04 2007-02-06 Dynetek Industries Ltd. Pressure vessel mounting system
CN100546843C (zh) * 2004-10-29 2009-10-07 福特全球技术公司 一种用于车辆的燃料存储系统
CN100402916C (zh) * 2005-12-02 2008-07-16 马磊 压缩天然气汽车换瓶加气法及装置

Also Published As

Publication number Publication date
ATE418041T1 (de) 2009-01-15
WO2008062261A1 (en) 2008-05-29
DE602006004368D1 (de) 2009-01-29
CN101405536B (zh) 2011-06-08
EP1925873A1 (de) 2008-05-28
CN101405536A (zh) 2009-04-08

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