WO2007149882A2 - Mécanisme régulateur à haute pression - Google Patents

Mécanisme régulateur à haute pression Download PDF

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Publication number
WO2007149882A2
WO2007149882A2 PCT/US2007/071598 US2007071598W WO2007149882A2 WO 2007149882 A2 WO2007149882 A2 WO 2007149882A2 US 2007071598 W US2007071598 W US 2007071598W WO 2007149882 A2 WO2007149882 A2 WO 2007149882A2
Authority
WO
WIPO (PCT)
Prior art keywords
piston
pressure
outlet
seat
inlet
Prior art date
Application number
PCT/US2007/071598
Other languages
English (en)
Other versions
WO2007149882A3 (fr
Inventor
Todd W. Larsen
David L. Thomas
Eric W. Neumann
Original Assignee
Tescom Corporation
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 Tescom Corporation filed Critical Tescom Corporation
Publication of WO2007149882A2 publication Critical patent/WO2007149882A2/fr
Publication of WO2007149882A3 publication Critical patent/WO2007149882A3/fr

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/10—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger
    • G05D16/103—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger the sensing element placed between the inlet and outlet

Definitions

  • This invention relates generally to a pressure regulator for high- pressure applications and, more particularly, to a high-pressure regulator for a tank dispensing compressed hydrogen.
  • Hydrogen has been demonstrated to be a very appealing alternative fuel supply for many applications, including automobiles, because the only byproducts of hydrogen consumption are heat and water.
  • Current hydrogen fuel supplies rely upon hydrogen fuel cells to generate electricity from stored hydrogen, which may be used to operate an electric motor to power an automobile.
  • hydrogen is typically stored in a gaseous state in a tank at relatively high pressures approaching 700 bar or 10,000 psi.
  • the high- pressure storage provides a large supply of hydrogen in a reduced storage volume.
  • the fuel cell generally draws hydrogen from the tank through a system of tubes or pipes as needed to maintain energy conversion, but it must be operated at significantly lower pressures (e.g., 200 psi) than the stored hydrogen for reduced system expense and safety.
  • At least one pressure regulator is provided between the tank and the fuel cell to reduce the pressure of the compressed hydrogen from the tank to a pressure suitable for the fuel cell system.
  • FIG. 1 is a cross-sectional view of an example high-pressure regulator having a predetermined regulated pressure.
  • FIG. 2 is a cross-sectional view of an example high-pressure regulator having an adjustable regulated pressure.
  • a high-pressure regulator includes a body which is preferably of a substantially cylindrical shape, and includes an inner bore preferably concentric with an outer bore such that the inner bore defines a pressure inlet and includes a seat ring located within the inner bore.
  • a bonnet forms a pressure chamber with a throughbore defining a pressure outlet preferably concentrically aligned with the inner bore.
  • a piston assembly internally disposed between the body and the bonnet selectively engages the seat ring of the inner bore for controlling a fluid flowing from the pressure inlet to the pressure outlet.
  • the piston assembly includes a piston, a piston seat and a loading element, wherein the piston seat is externally press-fit on the piston to circumferentially engage a piston base, which results in improved piston seat retention at extremely low temperature.
  • the piston includes a first effective sensing area for a first operational mode and a second effective sensing area for a second operational mode.
  • a high-pressure regulator includes a body having a substantially cylindrical shape including an inner bore substantially concentric to an outer bore such that the inner bore defines a pressure inlet and includes a seat ring located within the inner bore.
  • a substantially cylindrical bonnet forms a pressure chamber with a throughbore defining a pressure outlet substantially concentrically aligned with the inner bore.
  • the piston assembly comprises a piston having a first sealing member and a second sealing member, a piston seat and a loading element operatively coupled to the piston to provide a loading element force.
  • the arrangement of the first sealing member and the second sealing member provide a seal of the piston assembly at the bonnet and the body such that the first and second sealing members are not exposed to a relatively high inlet pressure thereby substantially reducing inlet pressure leaks within the body.
  • the example high-pressure regulator described herein provides a single regulator body that contains an interior piston assembly to control fluid flow through the regulator.
  • the outlet pressure of the example high-pressure regulator may remain substantially unaffected by variations in inlet pressure by relying upon direct outlet pressure feedback to control the fluid pressure.
  • a preferred example high-pressure regulator operates using a compressive force balance across the piston assembly to maintain the regulator outlet pressure at a predetermined pressure or set point.
  • a single or unitary piston within the piston assembly may reduce the number of required components, thereby enabling a more compact design with improved reliability and performance while lowering manufacturing and assembly costs.
  • the example pressure regulator is configured with seals only on the outlet or low pressure side of the regulator to substantially eliminate inlet pressure hydrogen leaks within the regulator.
  • a piston seat is coupled to the piston without supplemental retaining devices to provide improved low temperature performance.
  • the example regulator also advantageously provides an outlet pressure-assisted shutoff if a fluid leak occurs across the piston seat when the piston assembly is closed.
  • FIG. 1 a cross-sectional view of an example non- adjustable, high-pressure regulator 100 for a high-pressure gas dispensing system for a hydrogen fuel cell is shown.
  • the example high-pressure regulator 100 has a relatively small overall size (e.g., approximately D2.40" x H3.00") and has a substantially reduced total number of parts. Accordingly, the disclosed example offers a more reliable and less expensive, in-line, high-pressure regulator.
  • the example high-pressure regulator 100 is comprised of an interior piston assembly or module 130 disposed within a substantially single or unitary body 110.
  • a bonnet 150 threadably attached to the body 110 forms an outlet pressure chamber 160 for pressure control.
  • the example high-pressure regulator 100 is shown in an open position, such as when the regulator is transitioning between a fully opened and a fully closed position.
  • the preferred embodiment of the example high-pressure regulator 100 includes the body 110 having a single pressure inlet 112 formed from a hollow cylinder extending from the body 110 and including multiple concentric passageways of varying diameter positioned along a longitudinal axis C. External threads 115 on the pressure inlet 112 are provided, as shown, to connect the regulator 100 to a compressed gas source, such as a high- pressure hydrogen tank (not shown).
  • a compressed gas source such as a high- pressure hydrogen tank (not shown).
  • Other suitable coupling mechanisms for such high-pressure applications known by those skilled in that art may also be used.
  • a recess 117 is formed into the pressure inlet 112 to incorporate a high- pressure seal, such as a flat sheet gasket (not shown), to seal the regulator 100 to the tank.
  • a passageway 113 is formed in the body 110 to fluidly connect the piston assembly 130 to the pressure inlet 112 through an inlet pressure chamber 114, which will be discussed in greater detail below.
  • the body 110 further includes an inner cylindrical cavity 149, bounded by an interior wall 126 of the body 110.
  • the cylindrical cavity 149 preferably is substantially aligned with the longitudinal axis C of the pressure inlet 112.
  • This cylindrical cavity 149 is provided to retain a loading element 135, which is preferably a spring or other suitable loading element or biasing device.
  • the loading element 135 biases the piston assembly 130 in a generally upward direction when viewing the Figures, as will be discussed in greater detail below.
  • the body 110 may also include exterior threads 111 on an upper portion of the exterior wall 127 to threadably engage the bonnet 150 of the example high-pressure regulator 100 to form a pressure retaining assembly necessary to control the fluid flow.
  • a pressure outlet 170 is formed on the bonnet 150 along the longitudinal axis C and is preferably substantially aligned to the pressure inlet 112. As shown, external threads 159 or the like are provided on the bonnet 150 to provide for a threaded connection to a fuel cell system. An annular groove 171 may also be provided to accommodate a seal, such as an o-ring seal (not shown) on the bonnet 150.
  • the pressure outlet 170 is in direct fluid communication with the outlet pressure chamber 160 to provide outlet pressure feedback control.
  • Outlet pressure control is achieved by the regulator 100 outlet pressure interacting on a piston sensing area 158.
  • the sensing area 158 is defined by an outlet pressure side 155 of the piston assembly 130, as described in detail below.
  • the bonnet 150 and piston assembly 130 also define a separate ambient pressure chamber 162 to house the piston assembly 130. It should also be appreciated that the bonnet 150 includes a vent 174 within the ambient pressure chamber 162 to permit pressure equalization within the chamber to eliminate any "air spring" effect that may adversely affect the force balance necessary to operate the piston assembly 130.
  • the piston assembly 130 of the example high-pressure regulator 100 operates between the pressure inlet 112 and the pressure outlet 170 in a normally- open position (i.e., at pressures below a predetermined pressure or set point, fluid flows generally unobstructed from the inlet to the outlet) to regulate the fluid pressure, and therefore, the fluid flow.
  • the piston assembly 130 includes a single piston 132, the spring 135, a piston seat 129 and two annular seals 136 and 138.
  • the piston 132 is formed from a generally cylindrical base
  • the piston head 132 is preferably circular or substantially circular, although it is possible other shapes may prove sufficient. As shown in the Figures, the piston 132 has a generally T- shaped cross section. The piston 132 further incorporates a first annular channel 144 formed about the piston head 137 and a second annular channel 146 formed about a central portion 147 adjacent or above the piston base 139 to accommodate the two annular seals 136 (in the channel 144) and 138 (in the channel 146). The seals 136 and 138 may be o-rings.
  • the seal 136 provides a seal between the ambient pressure chamber and the outlet pressure chamber 160, while the seal 138 provides a seal between the between ambient pressure chamber 162 and the inlet pressure chamber 114.
  • the seals 136 and 138 may be manufactured from a polymer with suitable low-temperature performance and abrasion resistance such as ethylene propylene rubber (EPDM) available from the E. I. du Pont de Nemours, Wilmington, Delaware. Other materials may prove suitable.
  • EPDM ethylene propylene rubber
  • the seals 136 and 138 isolate the ambient pressure chamber 162 from the outlet pressure chamber 160 to direct the fluid towards the pressure outlet 170 and prevent fluid from escaping through the vent 174 in the bonnet 150.
  • the seals 136 and 138 and piston seat 129 are arranged to substantially reduce the risk of high-pressure leaks within the regulator by isolating certain regions of the regulator from fluid flow, as explained in greater detail below.
  • a lower surface 161 of the piston 132 may also be preferably configured to receive the loading element 135 (which may be a spring) to provide a predetermined force to counteract and/or balance an outlet pressure force exerted upon the sensing area 158 of the piston 132.
  • the piston seat 129 includes an internal channel 129a sized to engage an annular ring 129b on the piston base.
  • the piston 132 includes at least one cross-bore 168 within the piston base 139 that interconnects the hydrogen from the tank through an axial bore 169 within the piston 132 to the outlet 170.
  • the piston seat 129 and a seat ring 128 within the body 110 form a variable restriction at the inlet pressure chamber 114 to control fluid pressure within the regulator 100.
  • the piston seat 129 is shaped to sealingly engage a chamfered edge of the seat ring 128 within the regulator body 110. It should be appreciated by one of ordinary skill in the art that the restriction presented by the valve creates a pressure reduction within the regulator.
  • the regulated outlet pressure of the example high-pressure regulator is controlled by a force balance acting on the piston 132.
  • the piston 132 experiences an upward force due to the fluid pressure from the inlet 112 acting on the piston seat area and by the upward force of the loading element 135.
  • the sensing area may be the first effective sensing area formed by the recess 157 (such as when the piston 132 is in its uppermost position), or may be the second effective sensing are formed by the full diameter of the piston 132 (such as when the piston 132 is moved downwardly slightly).
  • the sensing area 158 of the piston 132 is defined by an upper surface
  • an outlet recess 157 on the piston 132 receives a control pressure via the axial bore 169 that yields a first outlet force proportional to a first effective sensing area related to the outlet recess 157 to counteract the force created by the inlet pressure and the spring 135.
  • the outlet recess 157 in the piston ensures that the initial outlet pressure force, in a high-pressure application such as the present example application, is sufficient to initiate pressure control in opposition to the high inlet pressure forces, by providing additional area (i.e. greater than an outlet area) when the valve is initially fully opened.
  • the entire upper surface 133 of the piston 132 is exposed to form a second effective sensing area approximately equal to the area of the outlet recess 157 and an annular area 156 yielding a proportional increase in outlet pressure feedback during pressure control.
  • the area of the recess 157 is less than the area of the full piston. More specifically, the diameter of the recess 157 is about 1.694 inches, while the diameter of the full piston is about 1.976 inches.
  • the increased effective sensing area provides enhanced pressure control by providing greater feedback force resulting from the increased second effective sensing area.
  • the example piston 132 as shown, has minimal inlet surface areas at the piston base 139 such that the outlet pressure feedback substantially offsets inlet forces on the piston 132 generated by the extremely high inlet pressures. This configuration allows the forces exerted upon the sensing area 158 to dominate outlet pressure control.
  • the piston assembly 130 defines multiple pressure zones or regions within the regulator.
  • the pressure regions are formed across the seals 136 and 138 as the piston 132 slidably engages a bonnet sealing surface 145 and a sealing surface 143 of an inner bore 118 of the body 110.
  • a first or high-pressure region exists between the pressure inlet 112, the seat ring 128 and the piston seat 129.
  • a second or relatively lower pressure or controlled outlet pressure region exists between the axial bore 169 and the pressure outlet 170 in the outlet pressure chamber 160 between the inlet annular seal 138 and the outlet annular seal 136 and a third or ambient pressure region exists within the ambient pressure chamber 162.
  • the spring 135 biases the piston 132 away from the seat ring 128 and into intimate contact with an inner surface 131 of the bonnet 150 to permit substantially unrestricted fluid flow from the pressure inlet 112 to the pressure outlet 170.
  • the fluid flows from the pressure inlet 112 through the cross-bore passageways 168 and momentarily pressurizes the outlet pressure chamber 160 to a pressure above the predetermined outlet pressure.
  • the piston seat 129 When the outlet pressure is substantially equal to the desired operating pressure or set point, as determined by the force balance, the piston seat 129 fully engages the seat ring 128 to substantially inhibit fluid flow through the regulator. It should be further appreciated by one of ordinary skill in the art that during operation the piston 132 is continuously cycled towards and away from the piston seat 128 to maintain pressure control in response to variations in outlet pressures.
  • the surface area of the piston 132 is preferably sixteen times (16x) greater that the surface area of the seat ring 128 to counteract the inlet fluid pressure force.
  • 16x sixteen times
  • the relatively large piston outlet surface areas ensure higher regulator gains, which results in lower regulator "droop" and stable control over a wide range of temperatures and pressures.
  • the regulation or decrease in pressure of the high-pressure gas from the tank results in extremely low temperatures within the high-pressure regulator 100. Specifically, the rapid expansion of the gas at the seat ring 128 reduces internal temperatures to nearly -50 Celsius.
  • the present example high- pressure regulator 100 uses the externally press-fit piston seat 129 to lessen the effects of thermal contraction on regulator performance. That is, under low temperature operation, the piston seat 129 contracts about the piston base 139 to affect a better connection therebetween.
  • the piston seat 129 is manufactured from a temperature-stable polyimide, such as Vespel ® from the E. I. du Pont de Nemours, Wilmington, Delaware.
  • the coefficient of thermal expansion for Vespel can be greater than or equal to the coefficient of thermal expansion for the piston base 139, which is preferably manufactured from 316L stainless steel. Accordingly, due to the different thermal expansion characteristics, at a pressure inlet fluid temperature below or substantially below an ambient fluid temperature, the piston seat firmly contracts about the piston base.
  • the piston seat 129 contracts at a greater rate than the piston base 139 forming a tighter connection under high-pressure. Additionally, fluid pressure is exerted upon the piston seat 129 in a direction that drives the piston seat 129 onto the piston base 139, thus securing a more rigid connection.
  • the outlet pressure may rise above the set point. In such a condition, the additional fluid flow creates an increase in the pressure of the outlet side of the piston assembly 130 and an additional closure force is generated against the sensing area 158.
  • the annular seals 136 and 138 serve to isolate the loading element 135 for the fluid flow.
  • hydrogen may cause hydrogen embrittlement of metals that can substantially reduce operational life.
  • the example high-pressure regulator improves operational life of the loading element 135 by substantially eliminating hydrogen exposure.
  • the loading element 135 may be manufactured from Elgiloy ® from Elgiloy Specialty Metals of Elgin, IL, which is known to be substantially less susceptible to the previously mentioned embrittlement effects. [0028] FIG.
  • FIG. 2 illustrates an alternate embodiment, which includes an adjustable high-pressure regulator 200.
  • the example regulator operates using a force balance across the piston assembly to control fluid flow.
  • the outlet pressure can be adjusted by modifying the preload on an adjusting spring 285 retained within the bonnet 250.
  • the piston 232 for this embodiment includes at least one lock nut, and preferably two lock nuts 280 and 281 forming a lock nut assembly 286, incorporated with an axial bore 269 of the piston 232 to control the preload on the adjusting spring 285.
  • the bonnet 250 contains a shoulder 253 configured to retain the adjusting spring 285 when the piston 232 is initially installed within the body 210.
  • the preload of the adjusting spring 285 is proportional to its compression, which is controlled by the position of the lock nuts 280 and 281 in the axial bore 269. That is, by increasing or decreasing the preload of the adjusting spring 285 by rotating or counter-rotating within internal/external mating threads 251 and 252, the bias force of the adjusting spring 285 can be controlled. Since the adjusting spring 285 supplies supplemental force to the outlet pressure force that is in opposition to or offsets the inlet pressure force and loading element forces previously described, it should be appreciated that by adjusting the position of the internal locking nuts 280 and 281 , the supplemental force can be controlled, and therefore the outlet pressure can be adjusted.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Fluid Pressure (AREA)

Abstract

L'invention concerne un mécanisme régulateur à haute pression comprenant un corps ayant une entrée de pression et une sortie de pression. Un piston est disposé dans le corps et accouplé de manière fluide au niveau de l'entrée de pression et de la sortie de pression. Le piston est configuré pour fonctionner en compression pour entrer en contact avec une bague de siège afin de commander l'écoulement du fluide allant de l'entrée de pression à la sortie de pression en réaction à une pression exercée sur une surface du piston par le biais de la sortie de pression. Un siège de piston entre circonférentiellement en contact avec le piston pour la mise en œuvre d'une meilleure étanchéité à basses températures.
PCT/US2007/071598 2006-06-19 2007-06-19 Mécanisme régulateur à haute pression WO2007149882A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80510506P 2006-06-19 2006-06-19
US60/805,105 2006-06-19

Publications (2)

Publication Number Publication Date
WO2007149882A2 true WO2007149882A2 (fr) 2007-12-27
WO2007149882A3 WO2007149882A3 (fr) 2009-05-14

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2162813A1 (fr) * 2007-06-19 2010-03-17 Tescom Corporation Régulateur haute pression
EP2770240A1 (fr) * 2013-02-26 2014-08-27 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Détendeur de pression, robinet et bouteille munis d'un tel détendeur
FR3003656A1 (fr) * 2013-03-25 2014-09-26 Ad Venta Detendeur inverse compact pour la distribution de gaz.
LU92383B1 (en) * 2014-02-27 2015-08-28 Luxembourg Patent Co Sa Pressure reducer with cap-shaped movable chamber

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5230359A (en) * 1992-06-15 1993-07-27 Veriflo Corporation Supply pressure compensated fluid pressure regulator and method
WO2000070419A1 (fr) * 1999-05-19 2000-11-23 Veritek Ngv, Corp. Regulateur de pression
WO2005124493A1 (fr) * 2004-06-15 2005-12-29 Toyota Jidosha Kabushiki Kaisha Dispositif réducteur de pression et système réducteur de pression

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5230359A (en) * 1992-06-15 1993-07-27 Veriflo Corporation Supply pressure compensated fluid pressure regulator and method
WO2000070419A1 (fr) * 1999-05-19 2000-11-23 Veritek Ngv, Corp. Regulateur de pression
WO2005124493A1 (fr) * 2004-06-15 2005-12-29 Toyota Jidosha Kabushiki Kaisha Dispositif réducteur de pression et système réducteur de pression

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2162813A1 (fr) * 2007-06-19 2010-03-17 Tescom Corporation Régulateur haute pression
EP2770240A1 (fr) * 2013-02-26 2014-08-27 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Détendeur de pression, robinet et bouteille munis d'un tel détendeur
FR3002614A1 (fr) * 2013-02-26 2014-08-29 Air Liquide Detendeur de pression, robinet et bouteille munis d’un tel detendeur
FR3003656A1 (fr) * 2013-03-25 2014-09-26 Ad Venta Detendeur inverse compact pour la distribution de gaz.
WO2014154953A3 (fr) * 2013-03-25 2015-01-08 Ad-Venta Detendeur inverse compact pour la distribution de gaz
LU92383B1 (en) * 2014-02-27 2015-08-28 Luxembourg Patent Co Sa Pressure reducer with cap-shaped movable chamber
WO2015128234A1 (fr) * 2014-02-27 2015-09-03 Luxembourg Patent Company S.A. Réducteur de pression à chambre mobile en forme de capuchon
US10428956B2 (en) 2014-02-27 2019-10-01 Luxembourg Patent Company S.A. Pressure reducer with cap-shaped movable chamber

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