JTKET shows Hydrogen Gas Valve, Regulator of Mirai FCV
Resource from: Tech-On Likes:139
Jun 11,2015
Jtekt Corp exhibited the high-pressure hydrogen gas valve and regulator employed for Toyota Motor Corp's Mirai fuel-cell vehicle at Automotive Engineering Exposition 2015.
The high-pressure hydrogen gas valve is opened when hydrogen is supplied to a fuel tank and closed after filling the tank to prevent hydrogen from leaking. The regulator reduces the pressure of hydrogen being supplied to fuel cells to about 1MPa. They are both manufactured at the company's Hanazono Plant.
It takes about three minutes to fill up the hydrogen tank. At this point, the valve is opened to quickly supply hydrogen with a high pressure. It is opened and closed by an electromagnetic solenoid. Jtekt (1) used a material that does not contain impurities much and is less likely to cause hydrogen embrittlement and (2) employed a structure whose valve deforms at the time of closure and eliminates gaps to prevent leakage.
For the valve, a tapered cylinder moves in and out of a cylindrical ring. When the tapered part touches the ring, the valve is closed. For the movement of the cylinder, the electromagnetic solenoid is used.
For eliminating leakage, it is necessary to increase the concentricity of the parts of the valve and reduce surface roughness as much as possible. However, no matter how accurately they were made, small gaps were made, leaking hydrogen.
Therefore, Jtekt employed a structure that fills the small gaps by using the elastic deformation of the valve. While a hard material improves the abrasion resistance of the valve, it makes the valve difficult to deform. It was difficult to attain a proper balance, the company said. The Mirai is equipped with two high-pressure hydrogen tanks, and each of them has this valve.
On the other hand, the Mirai uses one regulator whose valve has a similar structure and balanced by a spring. The spring is adjusted so that the pressure in the pressure chamber connected to fuel cells becomes about 1MPa. When the pressure lowers to less than 1MPa, the spring is compressed and the regulator (valve) is opened, supplying hydrogen from the high-pressure tank. When the pressure increases to higher than 1MPa, the regulator is closed. The housing and valve are made of aluminum alloy and steel, respectively.
For the valve, a tapered cylinder moves in and out of a cylindrical ring. When the tapered part touches the ring, the valve is closed. For the movement of the cylinder, the electromagnetic solenoid is used.
For eliminating leakage, it is necessary to increase the concentricity of the parts of the valve and reduce surface roughness as much as possible. However, no matter how accurately they were made, small gaps were made, leaking hydrogen.
Therefore, Jtekt employed a structure that fills the small gaps by using the elastic deformation of the valve. While a hard material improves the abrasion resistance of the valve, it makes the valve difficult to deform. It was difficult to attain a proper balance, the company said. The Mirai is equipped with two high-pressure hydrogen tanks, and each of them has this valve.
On the other hand, the Mirai uses one regulator whose valve has a similar structure and balanced by a spring. The spring is adjusted so that the pressure in the pressure chamber connected to fuel cells becomes about 1MPa. When the pressure lowers to less than 1MPa, the spring is compressed and the regulator (valve) is opened, supplying hydrogen from the high-pressure tank. When the pressure increases to higher than 1MPa, the regulator is closed. The housing and valve are made of aluminum alloy and steel, respectively.
(Tech-On)
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1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"CBCC".
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