Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
  • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
  • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
  • F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/1624—Destructible or deformable element controlled
  • Y10T137/1797—Heat destructible or fusible
  • Y10T137/1812—In fluid flow path
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/1842—Ambient condition change responsive
  • Y10T137/1939—Atmospheric
  • Y10T137/1963—Temperature
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/7722—Line condition change responsive valves
  • Y10T137/7781—With separate connected fluid reactor surface
  • Y10T137/7793—With opening bias [e.g., pressure regulator]
  • Y10T137/7808—Apertured reactor surface surrounds flow line
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/8593—Systems
  • Y10T137/87265—Dividing into parallel flow paths with recombining
  • Y10T137/87378—Second valve assembly carried by first valve head

Definitions

• the invention relates to a safety valve for a compressed gas storage, with a Abblaskanal, which is connected to the compressed gas storage, and a closure element, which is arranged movably in Abblaskanal and operating phase dependent releases the Abblaskanal to the outside.
• a safety valve for a compressed gas storage, with a Abblaskanal, which is connected to the compressed gas storage, and a closure element, which is arranged movably in Abblaskanal and operating phase dependent releases the Abblaskanal to the outside.
• a safety valve for a compressed gas storage in which the closure element is formed so that it is formed on the end sides with different sized cross-sectional areas, wherein the closure element also biased by a spring and axially back. and is herverschiebbar.
• An inventive safety valve for a compressed gas storage comprises a Abblaskanal, which is connected to the compressed gas storage.
• the safety valve comprises a closure element, which is arranged movably in the blow-off channel and, depending on the operating phase, releases the blow-off passage to the outside and has a larger cross-sectional area on the side facing away from the compressed-gas accumulator than on the side facing the compressed-gas accumulator.
• the exhaust duct is on the side facing away from the pressure accumulator
• Closing element formed with a constriction By such a safety valve, the discharge of a constant mass flow during a blow-off process can be achieved much more precisely and with almost no fluctuations.
• the constriction is formed so that before and after this constriction, the cross section of the Abblaskanals is greater than at the constriction.
• the constriction or bottleneck is thus designed so that an expansion of the flow cross-section is again provided in the flow direction on both sides of the constriction. This particularly preferably contributes to the constant maintenance of the mass flow to be discharged.
• the constriction is formed in the discharge direction of the medium and thus in the outflow direction of the medium after the closure element in the exhaust duct. This allows a locally and functionally a particularly suitable attachment with regard to the constant bleed mass flow.
• the Abblaskanal is formed in the discharge direction of the medium before the constriction with a portion having a flow cross-section which is smaller as a flow cross section of Abblaskanals before and after this section.
• the safety valve bottlenecks are thus formed in Abblaskanal, which can be achieved in a particularly advantageous manner, the setting of a highly precise constant mass flow during a blow-off.
• this portion is formed as a bore in the closure element, in particular in an end portion of the closure element facing the compressed gas storage.
• the end part of the closure element has the smaller cross-sectional area of the closure element, which is larger than the area of the flow cross-section of the section of the blow-off channel.
• the closure element is a displaceable in the axial direction of the Abblaskanals piston.
• the closure element is held with an inner sealing and locking element in its initial position.
• the starting position is defined when no blow-off process is performed and the closure element is thus held positionally stable in this starting position.
• the sealing and locking element has the function of sealing off the blow-off duct when no blow-off operation is carried out, and has the locking of the closure element in this starting position when no blow-off operation is carried out.
• the sealing and locking element is particularly advantageously filled with a liquid.
• the activation of the sealing and locking element can be achieved in a particularly simple and low-effort manner in safety-critical states in such a way that it is destroyed.
• the sealing and locking element loses its sealing and locking function depending on a temperature, in particular the temperature of the liquid.
• the liquid evaporates on heating and thereby expands, which leads to bursting of the sealing and locking element and thus the sealing function and the locking function is lost, whereby the closure element can be moved from its initial position.
• the sealing and locking element is a cylindrical capsule, in particular of glass or glass-like material, which is filled with a high-temperature evaporating liquid.
• a high temperature is understood to be one which can be present, for example, in safety-critical conditions in which fire occurs. The increase in temperature of the liquid caused by the fire then leads to the evaporation and destruction of the sealing and arresting element.
• the sealing and locking element In its installed position, the sealing and locking element preferably extends into the interior of the closure element and rests against a housing wall with a first end protruding from the section of the blow-off channel formed in the closure element, and lies against a projection for reducing it with a second end arranged in the closure element the flow cross section of the Abblaskanals in the closure element.
• This is a particularly advantageous and with regard to the function particularly suitable positioning.
• the sealing and locking element is arranged in the discharge direction of the medium to be discharged between the constriction and the portion of the Abblaskanals with reduced flow cross-section.
• the closure element is coupled to a biasing element, in particular a spring, for guiding movement during the blow-off process. It can thus be adjusted continuously and very accurately the movement of the closure element depending on the pressure conditions formed, so that in this regard unwanted and large fluctuations in the mass flow to be discharged can be changed.
• a biasing element in particular a spring
• the compressed gas storage for receiving fuel, in particular hydrogen or hydrogen-containing gas, a fuel cell system is formed.
• FIGURE shows a schematic sectional view of an embodiment of a safety valve according to the invention.
• the safety valve 1 is for the metered blowing off of hydrogen or hydrogen-containing gas in safety-critical states of a fuel cell system formed, this gas to be discharged is contained in a compressed gas storage of the fuel cell system.
• the compressed gas storage not shown, via a line (not shown) or directly connected to the safety valve 1.
• the safety valve 1 is associated with a fuel cell system, which preferably as a mobile
• Fuel cell system is formed and preferably arranged in a vehicle.
• the device according to the invention is also suitable for stationary compressed gas storage.
• the safety valve 1 comprises a blow-off channel 3, which extends through the safety valve 1 and has various sections.
• the blow-off channel 3 has an inner diameter d 1, which is greater than an adjoining inner diameter d 2 (see section I).
• d 1 an inner diameter
• d 2 an adjoining inner diameter
• an end part 4 of a closure element 5 designed as a piston extends. This closure element 5 can be displaced back and forth in the axial direction (x-direction) in the interior of the safety valve 1.
• the closure element 5 At its end part 4 facing the compressed gas reservoir, the closure element 5 has a cross-sectional area Al which is smaller than a cross-sectional area A2 at the opposite end.
• the surface dimensioning of the cross-sectional areas Al and A2 is dimensioned so that the cross-sectional area A2 is much larger than the cross-sectional area Al and is virtually negligible in a surface viewing in comparison to the cross-sectional area A2.
• the Abblaskanal 3 also extends in the interior of the closure element 5, wherein it is realized in this context at the pressure gas storage end portion 4 by a very small bore, as in the enlarged Section I of the figure is shown.
• This section 12 of the Abblaskanals in the end part 4 is realized by a bore which has an inner diameter d3, which is smaller than the inner diameter d2.
• This portion 12 of the Abblaskanals 3 is dimensioned, in particular in its length and its inner diameter d3, that the compressed gas storage is emptied in 2 to 10, preferably in 2 to 5 minutes.
• the blow-off channel 3 is formed such that it in turn has a larger inner dimension d4 than the inner dimension d3.
• the blow-off channel 3 is then widened again in the interior of the closure element 5, in which connection then an inner diameter d5 is formed.
• a projection 6 is produced in the interior of the closure element 5, which results in the stepped embodiment in the embodiment of the inner diameter d4 to the inner diameter d5.
• the blow-off channel 3 then has a constriction 7 after the closure element 5 and thus also after the large cross-sectional area A2.
• This constriction 7 is radially symmetrical and designed so that in the discharge direction of the hydrogen, the inner diameter of the Abblaskanals in the immediate vicinity of the constriction 7 before and after this is greater than at the constriction 7 itself.
• the Abblaskanal an inner diameter d ⁇ on.
• the constriction 7 thus represents an orifice, which is designed so that the compressed gas storage is emptied in 2 to 10, preferably in 2 to 5 minutes.
• the safety valve 1 comprises a sealing and locking element 8, which is preferably cylindrical.
• the sealing and locking element 8 is preferably formed as a cylindrical glass capsule, which is filled with liquid.
• the seal and Arret istselement 8 serves that, if no blow-off process is required, the Abblaskanal 3 seals and on the other hand holds the shutter member 5 in a stable position and thus locked.
• the sealing and locking element 8 In its initial position, the sealing and locking element 8 is positioned so that it extends for the most part inside the closure element 5, wherein it rests against the stop or the projection 6 and on the other hand rests against a housing wall 9 with the opposite end.
• the safety valve 1 comprises a spring 10 which serves to guide the movement of the closure element 5 during the blow-off process.
• the blow-off channel 3 can be released to the outside depending on the operating phase in order to be able to blow off hydrogen.
• the constriction 7 is formed in the region of the side facing away from the compressed gas storage side 11 of the safety valve 1.
• a minimum mass flow is made possible by the bore or the portion with the inner diameter d3 of the Abblaskanals 3 in the end portion 4 of the closure member 5 and also prevents blocking the Abblasvorgangs occurs.
• a constant mass flow is thus achieved in the blow-off process by these two essential measures, the bore with the inner diameter d3 and the constriction 7 with the inner diameter d ⁇ .
• the closure element 5 which has on the opposite sides of different sized cross-sectional areas Al and A2, in particular their size substantially different areas Al and A2, a function of the pressure control on the high and the low pressure side of the safety valve 1 is generated, this preferably in conjunction with the spring 10 for guiding movement of the closure element 5 is accompanied.
• D characterizes the spring constant of the spring 10, x the spring bias in the x direction, p L the pressure of the hydrogen on the low pressure side and p H the pressure of the hydrogen on the high pressure side.
• the area ratios of the cross-sectional areas Al and A2 are dimensioned such that the term Al * p H is negligible.
• the functional principle of the safety valve 1, which operates on the basis of a pressure regulator, will be explained briefly below.
• An essential point of the safety valve 1 is that a pressure-dependent mass flow control is made possible by a bore or a portion 12 of the Abblaskanals 3 with an inner diameter d3 in the input area on the one hand and a diaphragm or a constriction 7 at the output area, in which context the safety valve works on the basis of a pressure regulator.
• an external heat source is a Increasing the temperature of the liquid generated inside the sealing and locking element 8, as can occur, for example, in a safety-critical state of the fire, and the liquid heated and evaporated, whereby the sealing and locking element 8 is destroyed by it bursts. After this destruction, the closure element 5 is pressed by the pressure of the medium to be discharged on the cross-sectional area Al to the left and in the left chamber 13, a pressure builds up.
• the spring 10 acts on the left cross-sectional area A2, which is substantially larger than the area Al, and by this force action, the closure element 5 is moved to the right already at the relatively low pressure. Contrary to this force effect, the spring 10 acts.
• the spring 10 is adjusted by means of an adjusting nut to a desired pressure in the left chamber 13.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Safety Valves (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)
• Control Of Fluid Pressure (AREA)
• Fuel Cell (AREA)

Priority Applications (2)

Applications Claiming Priority (4)

Publications (1)

Family

ID=40911433

Family Applications (1)

Country Status (4)

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Citations (5)

Family Cites Families (12)

• 2008
  • 2008-04-12 DE DE200810018561 patent/DE102008018561A1/de not_active Withdrawn
• 2009
  • 2009-02-27 WO PCT/EP2009/001401 patent/WO2009109331A1/de not_active Ceased
  • 2009-02-27 US US12/920,431 patent/US8439064B2/en not_active Expired - Fee Related
  • 2009-02-27 JP JP2010548025A patent/JP5311076B2/ja not_active Expired - Fee Related

Patent Citations (5)

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