FLOWMETER

• Main Authors: MORI YUKIO, SAWADA YUKIO, NAGASAKA REI, BAN TAKAHISA, KATO TSUNEMITSU, UMETSU KUNIHIRO
• Format: Patent
• Language: English
• Published: 25.01.1994
• Edition: 5
• Subjects: MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING

PURPOSE:To prevent influences of a turbulent flow at the downstream of a supporting member supporting a branch passage in a main passage. CONSTITUTION:An air flowmeter 1 for measuring the amount of suction air to an automobile engine has an opening 3 on the upstream side and an opening 5 on the downstream side, constituting part of a passage for the suction air. A cocoon-shaped central member is supported by four ribs 140, 150 (only two of four are indicated in the drawing) approximately at the center of the air passage in the air flowmeter 1. A part of the suction air is introduced from an incoming opening 410 into a branch pipe 420. After the air flows in a measuring pipe 430, it runs outside the branch pipe 420 and exits through outgoing openings 440, 450. At this time, the flow rate is measured by sensors 570, 580. Since the outgoing openings 440, 450 are located on the upper stream side than the ribs 140, 150, the turbulent flow at the surface and downstream of the ribs 140, 150 do not act to the outgoing openings 440, 450. Accordingly, the disturbance of the flow inside the branch passage, and the change of the ratio of the flow rate between the branch passage and the whole air passage can be prevented.