HEATING WIRE TYPE AIR FLOW METER

摘要

PURPOSE:To reduce the outputted noise of a flow meter by sloping the wall surface of a main air path in a direction separate from the exit surface of a bypass on the upstream side of the confluence part of the main air path and the bypass. CONSTITUTION:Air 9 flowing into a flow meter body 1 is branched to flow in the bypass 5a and the main air path 6. The air branched to flow in the bypass 5a passes a flow measuring part in which a heating wire 3 and a temperature sensitive resistor 4 are arranged and flows out to the main air path from the exit 7 of the bypass. The air branched to flow in the main air path is two- divided to flow to the exit part of the bypass by a rib 8 and flows together with the branched flow in the bypass at the exit part of the bypass to be sucked in an engine. In such the case, the flow of the air branched to flow in the main air path near the rib 8 has a streamline along a wall 10 which forms a lateral bypass which crosses the rib 8 and the main air path. Since the flows of the air smoothly flow together, the outputted noise of the flow meter is reduced.