Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
  • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
  • H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
• • 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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
  • F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
  • F16L3/10—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing divided, i.e. with two members engaging the pipe, cable or protective tubing
  • F16L3/1091—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing divided, i.e. with two members engaging the pipe, cable or protective tubing with two members, the two members being fixed to each other with fastening members on each side
• • 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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
  • F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
  • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
  • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
  • H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/10—Fuel cells with solid electrolytes
  • H01M2008/1095—Fuel cells with polymeric electrolytes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
  • H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
  • H01M8/04291—Arrangements for managing water in solid electrolyte fuel cell systems
• • 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
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/30—Hydrogen technology
  • Y02E60/50—Fuel cells
• • 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
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
• • 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
  • Y10T137/6851—With casing, support, protector or static constructional installations
  • Y10T137/6855—Vehicle
• • 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
  • Y10T137/8811—Frangible

Definitions

• the present invention relates to a gas piping system for a fuel cell, and more particularly, to a gas piping system for a fuel cell including a gas piping that connects elements constituting the fuel cell system.
• fuel cells are installed in vehicles.
• the fuel cell supplies, for example, a fuel gas such as hydrogen to the anode side of the fuel cell stack, supplies an oxidizing gas containing oxygen, for example, air, to the power sword side, and takes necessary power by an electrochemical reaction through the electrolyte membrane.
• a fuel gas such as hydrogen
• an oxidizing gas containing oxygen for example, air
• the power sword side supplies an oxidizing gas containing oxygen, for example, air
• an electrochemical reaction for example, air
• water is generated by the electrochemical reaction on the force sword side.
• This generated water is contained in the spent oxidizing gas on the power sword side and carried outside.
• the generated water permeates the anode side through the electrolyte membrane, which is contained in the spent fuel gas and carried outside.
• the electrolyte membrane for example, a solid polymer membrane is used, but this constituent element such as fluorine is separated into the generated water, and highly corrosive ions such as fluorine ions are generated, and gas pipes are corroded. There are things to do.
• Japanese Patent Application Laid-Open No. 2 0 0 2-3 1 3 4 0 4 discloses a first method for collecting ions discharged from a solid polymer film in response to such a corrosion problem.
• An ion removal unit is provided on at least one of the fuel gas discharge pipe and the oxidant gas discharge pipe from which the generated water is discharged, and a second ion removal unit is provided on the fuel gas humidifier and the oxidant gas humidifier.
• a third ion removal unit is provided on at least one of the fuel gas humidifier side of the cooling water supply pipe and the oxidizing gas humidifier side of the circulation pipe, and the fourth ion removal unit is provided in the middle of the cooling water bypass pipe. And being provided in the middle of the circulating water bypass pipe.
• These ion removal units include an ion exchange resin.
• austenitic stainless steel contains nickel as a component, but since nickel may be eluted by fluorine ions, it is necessary to comply with the nickel emission standard when discharging produced water. Therefore, ferritic stainless steel that does not contain nickel, such as J
• the gas pipe itself is welded and fixed to the fixing portion.
• a brazing technique can be used, but such a welding technique requires a certain amount of high-temperature treatment. It is known that when ferritic stainless steel is treated at high temperature, Cr combines with the crystal grain boundary and chromium carbide precipitates, and the Cr content decreases near the grain boundary, making it sensitive to corrosion. When this sensitization occurs, intergranular corrosion can occur, so there remains a challenge for fixing methods that require high temperature processing.
• An object of the present invention is to provide a gas piping system for a fuel cell that can achieve both corrosion resistance and piping fixing properties. Disclosure of the invention
• a gas piping system for a fuel cell comprises: a gas piping made of stainless steel not containing a nickel component; and a fixture for fixing the gas piping to a fixing portion at room temperature.
• the fuel cell gas piping system according to the present invention preferably includes an elastic body provided between the gas piping and the fixture.
• the gas piping is a connection end connected to a component of the fuel cell system, and has an offset between the connection position and the position of the fixture.
• the fixture has a connection end, and the fixture has a notch that can be broken by an external force when an external force is applied to the connection end of the gas pipe.
• the gas pipe is made of stainless steel that does not contain a nickel component, and the gas pipe is fixed to the fixed part at room temperature using a fixture.
• a method of fixing to the fixing part with a fixing tool at room temperature for example, fixing to the fixing part with a porch or nut while holding down the gas pipe using an appropriate bracket. This prevents nickel from being included in the produced water, and does not expose the stainless steel that does not contain nickel to high-temperature processing, thus reducing the possibility of intergranular corrosion.
• the gas pipe can be stably fixed to the fixing portion.
• the external force can be absorbed by the elastic body, thus improving the impact resistance.
• FIG. 1 is a plan view of a gas piping system for a fuel cell according to an embodiment of the present invention.
• FIG. 2 is a diagram illustrating the overall configuration of a fuel cell system to which the fuel cell gas piping system according to the embodiment of the present invention is applied.
• FIG. 3 is a front view showing a state of fixing by a fixing tool in the embodiment according to the present invention.
• FIG. 4 is a side view showing a state of fixing by a fixing tool in the embodiment according to the present invention.
• FIG. 5 is an exploded view of the fixture in the embodiment of the present invention.
• FIG. 6 is a diagram for explaining the operation of the fixture when an excessive external force F is applied to the connection end of the gas pipe in the embodiment according to the present invention.
• the fuel cell system will be described as including a fuel cell stack, an air compressor (ACP), a humidifier, a diluter, etc., but these are elements for explaining the gas piping system. It may be a fuel cell system including other elements such as various control valves, various sensors, a cooling water system, and the like.
• gas pipes that connect fuel cell stacks, air compressors (ACPs), and humidifiers will be described.
• gas pipes that connect other elements are used. May be.
• a gas pipe between the fuel gas source and the fuel cell stack, various bypass gas pipes, and the like may be used.
• FIG. 1 is a plan view of a fuel cell gas piping system 10 disposed under the floor of a vehicle.
• the fuel cell gas piping system 10 is simply referred to as a gas piping system 10.
• FIG. 2 is a diagram for explaining the overall configuration of the fuel cell system 11 to which the gas piping system 10 is applied.
• the gas pipes 40, 4 2, 4 4 and 4 6 which are components of the gas pipe system 10 are distinguished from other E pipe elements and are indicated by thick solid lines.
• the gas piping system 10 includes a fuel cell stack 1 2, an air compressor (ACP) 2 8, a humidifier 3 2, and a diluter 2 4. This is a system that connects 4 2, 4 4, 4 6 and fixes the position to the suspension member 50, which is the fixed part of the vehicle body.
• ACP air compressor
• FIG. 2 is a configuration diagram of the fuel cell system 11.
• the fuel cell system 11 includes a fuel cell main body called a fuel cell slag 12 in which a plurality of fuel cell cells are stacked, and elements for supplying hydrogen gas arranged on the anode side of the fuel cell stack 12 and And each element for air supply arranged on the force sword side.
• the fuel cell stack 12 is a unit cell in which separators are arranged on both outer sides of a MEA (Membrane Electron Assembly) with catalyst electrode layers on both sides of an electrolyte membrane, which is a solid polymer membrane.
• MEA Membrane Electron Assembly
• the fuel cell stack 12 supplies a fuel gas such as hydrogen to the anode side, supplies an oxidizing gas containing oxygen, for example, air, to the power sword side, generates power by a cell chemical reaction through the electrolyte membrane, and takes out necessary power It has a function.
• a fuel gas such as hydrogen
• an oxidizing gas containing oxygen for example, air
• the anode-side hydrogen gas source 14 is a tank that supplies hydrogen as a fuel gas.
• the reguillere evening 16 connected to the hydrogen gas source 14 has a function of adjusting the gas from the hydrogen gas source 14 to an appropriate pressure and flow rate.
• the output port of Leguille Ichiba 16 is connected to the anode side inlet of the fuel cell stack 12, and fuel gas adjusted to an appropriate pressure and flow rate is supplied to the fuel cell stack 12.
• the shunt 18 connected to the anode side outlet of the fuel cell stack 12 is used to flow to the diluter 24 through the exhaust valve 22 when the impurity gas concentration of the exhaust gas from the anode side outlet increases.
• the exhaust gas at this time is a hydrogen gas containing reaction product water in addition to nitrogen.
• the circulation booster 20 provided between the flow divider 18 and the anode side inlet further increases the hydrogen partial pressure of the gas returning from the anode side outlet and returns it to the anode side inlet for reuse. This is a hydrogen pump.
• the oxidizing gas source 26 on the power sword side can actually use the atmosphere.
• An air compressor (ACP) 28 provided after the oxidation gas source 26 is a gas pressure booster that compresses the oxidation gas by the volume 30 to increase its pressure.
• the AC P 28 has a function of providing a predetermined amount of oxidizing gas by changing the rotation speed (the number of rotations per minute). That is, when the required flow rate of oxidizing gas is large, the rotational speed of the motor 30 is increased, and conversely, when the required flow rate of oxidizing gas is small, the rotational speed of the motor 30 is decreased.
• the humidifier 3 2 has a function of moistening the oxidant gas to an appropriate extent and efficiently performing the fuel cell reaction in the fuel cell stack 12.
• the humidifier 3 2 is supplied with oxidizing gas from the ACP 28 through the flow path formed by the gas pipe 40.
• the oxidizing gas appropriately moistened by the humidifier 3 2 is supplied to the power sword side inlet of the fuel cell stack 1 2 through the flow path of the gas pipe 4 2 and exhausted from the power sword side outlet. .
• the reaction product water is also discharged along with the exhaust. Since the fuel cell stack 1 2 becomes hot due to the reaction, the discharged water is steam.
• the spent oxidizing gas containing water vapor is supplied to the humidifier 3 2 through the flow path by the gas pipe 4 4 to moderately moisten the oxidizing gas before use from the ACP 28 earlier.
• the humidifier 32 has a function of appropriately giving water vapor to the oxidizing gas, and a gas exchanger using a so-called hollow fiber can be used.
• the used oxidizing gas that has passed through the humidifier 3 2 is supplied to the diluter 2 4 through the flow path of the gas pipe 4 6 and used for dilution to dilute the used fuel gas exhausted from the exhaust valve 2 2. Used as gas.
• the diluter 24 collects the hydrogen-containing wastewater from the anode-side exhaust valve 22 and the hydrogen-containing exhaust that leaks through the MEA due to the steam on the power sword side, and is used from the humidifier 3-2. It is a buffer container that is diluted with oxidizing gas and discharged to the outside as a suitable hydrogen concentration.
• gas piping is used for supplying fuel gas, supplying oxidizing gas, exhausting used fuel gas, exhausting used oxidizing gas, and the like.
• gas pipes 40, 4 2, 4 4 and 4 6 are shown as thick solid lines as an example.
• FIG. 1 is a diagram showing the gas pipes 40, 4 2, 4 4, and 4 6 when the fuel cell system 11 described in FIG. 2 is mounted under the floor of a vehicle.
• the fuel cell stack 1 2 and ACP 2 8 are arranged on the suspension member 50 fixed to the vehicle body, and the humidification is performed on the underfloor member 5 1 fixed to the vehicle body in the same manner.
• a vessel 3 2 and a diluter 2 4 are arranged, and these are connected by gas pipes 40, 4 2, 4 4, 4 6.
• Figure 1 shows the direction of the front side, which is the front side of the vehicle, and the vehicle The direction of the rear side, which is the rear side, is shown.
• the suspension member 50 is arranged on the front side of the underfloor member 51. Therefore, the fuel cell stacks 1 2 and 8 and 2 8 are arranged on the front side of the humidifier 3 2 and the diluter 2 4.
• the gas pipes 40, 4 2, 4 4, 4 6 have connection ends 4 8, 4 9 at both ends, respectively, and by these connection ends 4 8, 4 9,
• the fuel cell stack 1 2, ACP 2 8, humidifier 3 2, and diluter 2 4 are securely connected to the gas ports.
• the gas pipes 40, 4 2, 4 4 are fixedly attached to the suspension member 50, which is a fixed part of the vehicle, by the fixture 60. As shown in FIG.
• each gas pipe 40, 4 2, 4 4, 4 6 is not a straight pipe, and therefore, each gas pipe 40, 4 2, 4 4, 4 6 has both ends.
• the positions of the connection ends 4 8 and 4 9 and the position of the fixture 60 are not linear and have an offset in the positional relationship.
• FIG. 3 and FIG. 4 are diagrams showing a state of fixing by the fixing tool 60, and here, the gas pipe 44 is shown as a representative for explanation.
• FIGS. 3 and 4 are diagrams respectively showing a state when the direction of the line of sight is changed by 90 degrees. If FIG. 3 is a front view, FIG. 4 corresponds to a side view.
• One connecting end 48 of the gas pipe 44 is connected to the port 13 of the fuel cell stack 12 that is fixedly disposed on the suspension member 50.
• connection end 4 9 of the gas pipe 4 4 is connected to a port 3 3 of a diluter 24 arranged fixedly to the underfloor member 51.
• the gas pipe 44 is fixed to a suspension member 50 which is a fixed part in the vehicle by a fixture 60 at a position intermediate between the connection end 48 on one side and the connection end 49 on the other side. Is done.
• the port 13 is an outlet through which the spent oxidizing gas mixed with water vapor is discharged in the fuel cell stack 12, and the port 13 is in the humidifier 3 2. It is a port to which used oxidizing gas mixed with water vapor is supplied.
• the gas pipe 4 4 carries out the used oxidizing gas containing the generated water generated by the cell chemical reaction in the fuel cell stack 1 2 as water vapor from the fuel cell stack 1 2 to the humidifier 3 2. It has a function as a functional flow path.
• the gas pipe 4 4 is a corrosion-resistant metal tube made of stainless steel that is substantially free of nickel components so as to withstand corrosion by dissolved fluorine ions from the solid polymer membrane that is a component of the fuel cell stack 1 2. is there. Specifically, SUS 43 type ferritic stainless steel in JIS standard can be used. Taking an example of the dimensions of the gas pipe 44, the outer diameter is about 30 mm and the inner diameter is about 28 mm. Of course, other dimensions may be used.
• the fixture 60 is provided between two bracket members 6 2 and 6 4 having a shape along the circular outer shape of the gas pipe 4 4, the outer periphery of the gas pipe 4 4, and the bracket members 6 2 and 6 4.
• the elastic member 66 is arranged to be disposed.
• the two bracket members 6 2 and 6 4 have an inner diameter shape that supports the circular outer shape of the gas pipe 44 when they are combined, and an elastic member 6 is provided between the inner diameter shape and the outer periphery of the gas pipe 44. 6 is arranged and integrated with multiple bolts and nuts 5 5 and 5 6.
• the fixing device 60 that supports and integrates the gas pipe 4 4 is attached to the suspension member 50 that is a fixing portion of the vehicle body by a plurality of bolts and nuts 5 3 and 5 4 via the mounting member 52. Mounted and fixed.
• FIG. 5 is an exploded view of the fixture 60.
• Each of the bracket member 6 2 and the bracket member 6 4 is a member having a semi-annular portion in cross-sectional shape, and the two annular members 6 2 and 6 4 are combined with the semi-annular portions 6 7 facing each other. Sometimes it becomes one tube.
• the inner diameter of the tubular part when combined is set slightly smaller than the outer diameter of the gas pipe 44.
• the bracket member 6 4 has a shape composed of a semi-annular portion 6 7 and flat portions 6 8 on both sides of the semi-annular portion 6 7, but the bracket member 6 2 further includes a flat portion 6 8 on one side. Is bent and has an overhang 69. As described with reference to FIG. 3, this overhanging portion 69 is used for connecting and fixing to the mounting member 52 using fixing means such as a porch nut 54.
• Corresponding flat portions 6 8 of each bracket member 6 2, 6 4 can be divided into two bracket members using appropriate fastening means such as a plurality of port nuts 55, 56, etc. as described in FIG. Used as a mating surface for integrating 6 2 and 6 4.
• the fastening means for integrating the two bracket members 6 2 and 6 4 is the bolt 'Natsu
• a force squeeze or the like can be used, but in any case, a means that can be fastened at room temperature without requiring any special heat treatment is selected.
• force staking can be used to connect and fix the mounting member 5 2 and the bracket member 6 2 to the overhanging part 6 9, and the gas pipe 4 4 can be thermally affected.
• welding may be used.
• the bracket member 6 2 is previously attached to the attachment member 52 fixed to the suspension member 50 in advance by welding, and then the bracket member 6 is connected via the gas pipe 4 4 and the elastic member 6 6. 4 can be fastened by fastening means.
• bracket members 6 2 and 6 4 having the semi-annular portion 6 7, the flat portion 6 8, and the overhang portion 6 9 can be obtained by forming a metal flat plate by an appropriate bending technique or pressing technique. it can.
• bracket members 6 2 and 6 4 having a semi-annular portion 67, a flat portion 68, and an overhanging portion 69 can be obtained by forming a steel plate having an appropriate thickness and strength.
• a steel plate with an outer diameter of gas pipe 44, about 30 mm, and a width of about 60 mm, which is about twice the outer diameter, is about 1 mm thick.
• the bracket member 6 2, 6 4 can be made into a predetermined shape by performing processing such as making the semi-annular part the axial direction of the arc.
• the bracket member 6 2 has a bead 7 2 formed on the top of the semi-annular part 6 7, and the bead 7 2
• a notch portion 70 is provided at a position corresponding to one end of the.
• the bracket member 6 4 is not provided with a bead 7 2 and a notch 70.
• the bracket member 64 may be provided with a bead 72 and a notch 70.
• the bead 72 is a protrusion provided linearly along the top of the semi-annular portion 67.
• the bead 72 has a function of setting a portion of the bracket member 62 that is different in strength from the other portions. Specifically, the bead 72 has a direction in which a crack is generated due to an excessive external force at the notch 70. Has the function of guiding the bead 7 2 along.
• the thickness of this protrusion is the same as or thinner than other parts.
• the bead 7 2 has the semi-annular part 6 7 Protrusions formed with a small bend with a radius of about 1 mm along the top.
• the direction in which the gas pipe 72 extends is the axial direction of the gas pipe 44 when the gas pipe 44 is supported by the bracket members 6 2 and 6 4.
• the notch 70 is provided at one end of the bead 72, and is a portion where the bracket member 62 is notched.
• the notch 70 has a function to make the bead 72 easily break when the external force is applied to the fixture 60 through the gas pipe 44, in other words, It is a weak portion that is intentionally provided in the bracket member 62.
• As the cutout portion 70 a triangular cutout gradually narrowing toward the bead 72 can be used.
• the one end of the bead 72 is the side of the connection end 48 on one side of the gas pipe 44 when the gas pipe 44 is supported by the bracket members 6 2 and 64. In other words, it is the end portion on the fuel cell stack 12 side when the gas pipe 44 is supported by the bracket members 6 2 and 6 4.
• the notch 70 is not provided at the other end of the bead 72, that is, the end that becomes the humidifier 32 side when the gas pipe 44 is supported by the bracket members 62, 64.
• the fuel cell stack 1 2 is located on the front side of the vehicle relative to the humidifier 3 2, and when the vehicle receives an impact from the front, the fuel cell stack 1 2 Receive external force first.
• the notch 70 is arranged at the end on the fuel cell stack 12 side that first receives external force when an impact is applied to the vehicle.
• the strength of the notch 70 that is, when the fixture 60 is fixed to the suspension member 50 and an external force is applied to pull the fixture 60 away from the suspension member 50 via the gas pipe 44.
• the magnitude of the strength to break can be obtained by experiments or the like based on the specific shape of the notch 70 and the shape of the bead 72, for example.
• the breaking strength can be set small by making the apex angle of the triangle of the cutout portion 70 an acute angle ⁇ .
• the elastic member 6 6 is disposed between the tubular portion formed in the integrated bracket members 6 2 and 6 4 and the outer periphery of the gas pipe 44, and prevents the gas pipe 44 from rotating.
• the gas pipe 4 4 is It will be less constrained about the movement of the direction.
• the elastic member 6 6 can apply an appropriate friction to the outer periphery of the gas pipe 44 by utilizing its elasticity, and thereby, the axial rotation and the axial direction of the gas pipe 44 can be provided. The movement can be restrained moderately.
• the magnitude of the restraining force due to the frictional force is the elastic coefficient of the elastic member 6 6, the compression ratio when sandwiched between the bracket members 6 2, 6 4 and the gas pipe 4 4, the size of the elastic member 6 6,
• the friction coefficient between the elastic member 6 6 and the bracket members 6 2 and 6 4, the friction coefficient between the elastic member 6 6 and the gas pipe 44, and the like can be set in advance.
• the elastic member 66 a material having a sufficiently lower elastic modulus than metal can be used.
• a material having viscoelasticity is preferable.
• a plastic rubber sheet can be used.
• the bracket member 6 2, 6 4 has a width dimension
• the gas pipe 44 has an outer peripheral length, and a rectangular shape having an appropriate thickness.
• a plastic rubber sheet having a shape can be prepared and placed so as to be wrapped around the outer periphery of the gas pipe 44.
• foamed plastic rubber such as ethylene propylene rubber (EPM) or ethylene propylene rubber (EPDM) obtained by adding a small amount of a third gen component to EPM can be used.
• EPM ethylene propylene rubber
• EPDM ethylene propylene rubber
• an EPDM sheet having a width of about 60 mm, a length of about 100 mm, and a thickness of about 1 mm can be used.
• the fixing device 60 is fixed to the suspension member 50 that is a fixing portion of the vehicle by sandwiching the outer periphery of the gas pipe 4 4 by the bracket members 6 2 and 6 4 via the elastic member 66. It is.
• the fixture 60 appropriately restrains the axial rotation and axial movement of the gas pipe 44, for example, Regarding vibration, the gas piping 4 4 suppresses rattling.
• the fixture 60 has an action of determining and holding the position of the gas pipe 44 so that it can cope with a certain amount of external force.
• the fixture 60 has a function of protecting the gas pipe 44 from deformation or damage against an excessive external force by the action of the bead 72 and the notch 70. This function will be described with reference to Fig. 6.
• Fig. 6 (a) shows the situation when an excessive external force F is applied to the connection end 48 of the gas pipe 44, and (b) shows that the fixture 60 breaks due to the excessive external force.
• FIG. 4 is a diagram showing a state where the gas pipe 44 is protected from deformation or damage. _
• an offset L exists between the position of the connection end 48 and the position of the fixture 60.
• Figure 6 (a) shows the situation.
• the stainless steel not containing nickel is used as the material of the gas pipe, and the fixing to the fixing part is fixed at a room temperature using a fixture, so that the fluorine contained in the generated water in the fuel cell stack It is possible to prevent nickel from being eluted by ions, and to prevent sensitization of intergranular corrosion due to high-temperature treatment.
• the gas pipe By disposing the elastic member between the fixture and the gas pipe, the gas pipe can be positioned and held with respect to a certain amount of external force. Also By providing a notch or the like in the fixture, the gas piping can be protected from deformation and damage by self-breaking of the fixture when an excessive external force is applied to the elements constituting the fuel cell system.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Sustainable Development (AREA)
• Sustainable Energy (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Fuel Cell (AREA)
• Supports For Pipes And Cables (AREA)

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• 2006
  • 2006-12-01 JP JP2006325849A patent/JP5011985B2/ja active Active
• 2007
  • 2007-11-07 DE DE112007002878.5T patent/DE112007002878B4/de active Active
  • 2007-11-07 CN CN2007800444443A patent/CN101553948B/zh active Active
  • 2007-11-07 WO PCT/JP2007/072041 patent/WO2008065884A1/ja not_active Ceased
  • 2007-11-07 US US12/516,959 patent/US8230883B2/en active Active

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