Nippondenso Co., Ltd.

Mikiyasu Kouketsu

Toshio Tanahashi

Yukio Mori

Yukio Sawada

Hiroshi Hasegawa

Ryo Nagasaka

Akira Muramatsu

Takeo Matsuura

An apparatus for measuring a flow rate of gas comprises a gas passage through which the gas to be measured flows in an axial direction thereof, a movable member linearly movable being disposed in the gas passage in a gas flow direction, a flow pipe providing therein the gas passage, a cross-sectional area of the flow pipe being increased along the gas flow direction in at least over a moving range of the movable member, a rod secured to the movable member to extend from the movable member along the gas flow direction, a bearing for bearing the rod for movement in response to moving of the movable member, the bearing being disposed in the gas passage and secured to the flow pipe, a helical spring for urging the movable member towards a direction opposite to the gas flow direction, a potentiometer for converting an amount of displacement of the rod into an electric signal, an amount of the displacement of the rod corresponding to that of movement of the movable member, a first cylinder closed at one end thereof by the movable member and opened at the other end thereof, the first cylinder extending along the gas flow direction, and a second cylinder disposed in the gas passage and secured to the flow pipe, the second cylinder being closed at one end thereof and opened at the other end thereof, the second cylinder being engaged at the other end thereof with the other end of the first cylinder through a minute clearance therebetween.

Gas flow measuring apparatus

Growing community of inventors

Ichinomiya, Japan

Mikiyasu Kouketsu