Gas flow rate measuring apparatus

Abstract

Abstract PURPOSE:To reduce measuring errors in the measurement of flow rate with the uniformed flow velocity distribution in a flow rate measuring tube by providing a tiny hole at the inlet of the flow rate measuring pipe to lessen exfoliated flows and vortex flows generated at the inlet. CONSTITUTION:A tiny hole 51 is provided piercing from the inlet end of a flow rate measuring pipe to the perimeter of the measuring pipe 8 between temperature-depended elements at an angle alpha to the line parallel to the center line of a suction conduit 3 and a electric heater element 10 and temperature-depended elements 11 and 12 are provided at the downstream of the tiny hole 51 to measure the flow rate. As the flow velocity outside the flow rate measuring pipe 8 is higher than that inside the pipe 8, the pressure on the inner wall of the measuring pipe 8 becomes smaller than the pressure outside the pipe 8. The difference in the pressure allows a flow to be generated from the outside to the inside of the pipe 8 through the tiny hole 51 eventually making the gas flowing into the pipe 8 flowing into a exfoliated flow. This reduces the difference in the flow velocity between the main flow and the exfoliated flow thereby bringing the velocity boundary closer to the inner wall surface of the flow rate measuring pipe 8 thereby lessening the disturbance of the flow velocity.

Inventors

• 👤 Kenji Kanehara
• 👤 賢治 金原
• 👤 Takeshi Nomura
• 👤 健 野村
• 👤 Tokio Kohama
• 👤 時男 小浜
• 👤 Hisashi Kawai
• 👤 寿 河合
• 👤 Norihito Tokura
• 👤 規仁 戸倉

Bibliographic Details