Seiko Instruments Inc

Sii Crystal Technology Inc.

Takafumi Sarata

Fumiharu Iwasaki

Norimasa Yanase

Tsuneaki Tamachi

Toru Ozaki

Kazutaka Yuzurihara

Noboru Ishisone

Kazuyoshi Furuta

Fumiyasu Utsunomiya

Saiichirou Ohtsuka

Yoshikazu Kato

Tuneaki Tamachi

To provide a small-sized piezoelectric vibrating reed and a piezoelectric vibrator with excellent durability. The piezoelectric vibrating reed includes a piezoelectric plate having a rectangular shape, a vibrating portion formed on a principal surface of the piezoelectric plate and a pair of mount portions for mounting the piezoelectric plate. The pair of mount portions are formed at both end portions of the piezoelectric plate in a longitudinal direction. The piezoelectric vibrator includes the piezoelectric vibrating reed and a package on which the mount portions of the piezoelectric vibrating reed are mounted.

Piezoelectric vibrating reed and piezoelectric vibrator

A fuel cell has a membrane electrode assembly (MEA), a supply member for supplying an anode fluid to the MEA, and a gas diffusion layer provide between the supply member and the MEA. The MEA has an electrolyte membrane and an anode catalyst. The supply member has at least one anode fluid flow path for supplying the anode fluid toward the MEA. The anode fluid flow path has an opening provided on a discharge side thereof for the anode fluid. A space for storing a gas pushed by the supply of the anode fluid is disposed between the opening of the anode fluid flow path and the gas diffusion layer so that the opening of the anode fluid flow path and the gas diffusion layer are not in direct contact with one another.

Fuel cell and fuel cell system as described and claimed in

A fuel cell has a membrane electrode assembly and a supply member for supplying an anode fluid to the membrane electrode assembly. The membrane electrode assembly has an electrolyte membrane and an anode catalyst. The supply member has at least one anode fluid flow path for supplying the anode fluid toward the membrane electrode assembly. A gas diffusion layer is provided between the supply member and the membrane electrode assembly. An opening of the at least one anode fluid flow path on a discharge side thereof for the anode fluid is disposed in contact with a side of the gas diffusion layer facing the supply member. The side of the gas diffusion layer includes a region that stores a gas pushed by the supply of the anode fluid.

Fuel cell and fuel cell system

A power supply apparatus has a combined power source with power cells configured electrically independently. A switch arbitrarily changes connection paths of the power cells by selectively connecting terminals of the power cells through switching elements. A detector detects differences in electrical potentials between power cell terminals. An output detector detects a power consumption in a load and/or an output power of the power source. ON-OFF states of the switching elements are controlled by a control signal generated based on voltage signals representing detected differences in electrical potentials, power consumption, and output power. A connection status of each power cell is controlled so as to halt outputting of the power cell having the lowest output voltage if it is detected that a detected power value is equal to or lower than an output power preset based on a power generating capacity of the power source.

Power supply apparatus

A power supply apparatus has a combined power source with power cells configured electrically independently. A switch arbitrarily changes connection paths of the power cells by selectively connecting power cell terminals through switching elements. A voltage detector detects differences in electrical potentials between the power cell terminals. A controller controls ON-OFF states of the switching elements by controlling the switch by a control signal generated based on voltage signals representing the differences in electrical potentials detected by the voltage detector so as to isolate one of the power cells to stop a supply of electric power therefrom when a voltage generated in the power cell has dropped to a specified voltage or lower. The controller restarts the supply of electric power from the power cell whose power supply has been stopped when the duration of a down time of the power cell has reached a predetermined time or longer.

A hydrogen generator has a reaction chamber that contains a complex hydride capable of reacting with an aqueous acid solution to generate hydrogen. A storage chamber contains an aqueous acid solution that is supplied through a supply pipe to the reaction chamber to react with the complex hydride to generate hydrogen. The total weight of water contained in the aqueous acid solution is 0.2 times or more, but 3 times or less, than the weight of the complex hydride. A control device controls the supplying of the aqueous acid solution through the supply pipe to the reaction chamber based on a reference pressure such that the aqueous acid solution is repeatedly supplied to the reaction chamber when the reference pressure is greater than the internal pressure within the reaction chamber and not supplied to the reaction chamber when the reference pressure is less than the reaction chamber internal pressure.

Hydrogen generator

A pressure regulating valve has a first pressure deformation portion connected to and receiving a pressure on a fuel demand side, a second pressure deformation portion opposed to the first pressure deformation portion and receiving a predetermined pressure, first and second flow passages, and a communication passage communicating the first and second flow passages to each other. A valve member has a connecting portion connecting the first and second pressure deformation portions together, and has a valve element provided at the connecting portion and configured to close the communication passage when moved toward the second pressure deformation portion. When the pressure on the fuel demand side is lower than a predetermined value, the valve element does not close the communication passage, but when the pressure on the fuel demand side is equal to or higher than the predetermined value, the valve element closes the communication passage.

Pressure regulating valve, fuel cell system using same, and hydrogen generating facility

A fuel cell has cell units and a manifold for uniformly supplying an anode fluid to the cell units. The manifold has a fluid supply plate with a flow conduit for feeding an anode fluid, and a plate structure having a flow space and openings arranged in a preselected direction. The flow space receives an anode fluid fed from an opening part of the flow conduit, reduces a flow rate of the anode fluid, and disperses the anode fluid at the reduced flow rate along a plane direction orthogonal to the preselected direction. The block group is arranged between the openings and the opening part so that the flow space is disposed between the block group and the opening part. The block group comprises blocks spaced apart from one another to form paths for dispersing into the openings the anode fluid dispersed by the flow space at the reduced rate.

Fuel cell

A fuel cell system supplies a reacting solution from a liquid storage section to a reaction section to generate a reacting gas. A gas storage section stores the reacting gas and supplies it to a solid polymer membrane fuel cell which generates electricity using the reacting gas as fuel. The reacting solution is supplied from the liquid storage section to the reaction section when the pressure in the liquid storage section is higher than the pressure in the reaction section and the supply of reacting solution is stopped when the pressure in the liquid storage section is lower than the pressure in the reaction section. In this manner, the supply volume of the reacting solution is controlled in accordance with the driving state of the fuel cell.

Fuel cell system controlled in accordance with drive condition of fuel cell

In a fuel cell power source system comprising a fuel cell, a fuel supplier for supplying a fuel to the fuel cell, an electricity storing member capable of charging and discharging an energy, and a control circuit for controlling outputs of the fuel cell and the electricity storing member and the fuel supplier for supplying a power to an external load, there are provided a method of operating the fuel cell power source system and a fuel cell system promoting safety of the fuel cell system and reducing a deterioration in the fuel cell by removing the fuel remaining at inside of the fuel cell after stopping the fuel supplier. At an initial stage of supplying the power to the external load and inside of the fuel cell system, the power is supplied from the electricity storing member, and the electricity storing member is charged by using an output outputted from the fuel cell by generating the power by the fuel cell by using the fuel remaining at inside of the fuel cell system after stopping the external load.

Method of operating fuel cell system and fuel cell system

A fuel cell has cell units and a manifold for uniformly supplying an anode fluid to each of the cell units. The manifold has a feed port through which an anode fluid is supplied, a first buffer section in fluid communication with the feed port for receiving the anode fluid and for reducing a flow rate of the anode fluid, a second buffer section in fluid communication with the first buffer section for receiving the anode fluid from the first buffer section at the reduced flow rate and for further reducing the flow rate of the anode fluid, and a block group formed of blocks spaced apart from one another to form flow channels in fluid communication with the second buffer section and through which the anode fluid at the further reduced flow rate flows. An array of fine openings is disposed in fluid communication with the cell units for receiving the anode fluid at the further reduced flow rate flowing through the flow channels so that the anode fluid is uniformly supplied to each of the cell units.

A pressure regulating valve comprises a first pressure deformation portion which receives a pressure on a fuel demand side, a second pressure deformation portion opposed to the first pressure deformation portion and which receives a predetermined pressure, first and second flow passages, and a communication passage for allowing the first and second flow passages to communicate with each other. The first and second flow passages and the communication passage are provided in a space between the first and second pressure deformation portions. A valve member has a connecting portion which extends through the communication passage and connects the first and second pressure deformation portions together, and has a valve element which is provided at the connecting portion and closes the communication passage when moved toward the second pressure deformation portion. When the pressure on the fuel demand side is lower than a predetermined value, the valve element does not close the communication passage, but when the pressure on the fuel demand side is equal to or higher than the predetermined value, the valve element closes the communication passage.

This invention provides a fuel battery comprising a solid polymer electrolyte membrane, an anode-side catalyst body and a cathode-side catalyst body disposed respectively on both sides of the solid polymer electrolyte membrane, and a fuel guide part in which the anode-side catalyst body is disposed opposite to the anode-side catalyst body on the opposite side where the anode-side catalyst body faces the solid polymer electrolyte membrane and which guides a fuel which has been externally supplied toward the center of the face of the anode-side catalyst body.

Fuel cell exhibiting enhanced hydrogen distribution density

A hydrogen production apparatusis constructed in which when workis close to a supply hole, a strutis pushed to open the supply hole, and when erosion of the workprogresses to cause the strutto protrude, the supply holeis closed with a seal member, so that products do not stay on the work, a reaction solutionis not fed to portions other than the work, and even if the attitude of the apparatus is changed, a hydrogen production reaction can be controlled appropriately.

Hydrogen production apparatus with solution feed control to eliminate build-up of products on a solid reactant

Hydrogen generation materials are a complex hydride which generates hydrogen upon hydrolysis, and an aqueous solution comprising water for causing the hydrolysis, and an accelerator dissolved therein for accelerating a hydrogen generation reaction. A method of hydrogen generation by a hydrogen generator comprises a first step Sof detecting that the internal pressure of a reactor is lower than a reference pressure, and supplying the aqueous accelerator solution to the reactor; a second step Sof dissolving the complex hydride in the aqueous accelerator solution to cause a hydrogen generation reaction; and a third step Sof detecting that the internal pressure of the reactor is higher than the reference pressure, and stopping the supply of the aqueous accelerator solution, and repeats the flow from the first step Sto the third step S

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Chiba, Japan

Takafumi Sarata