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Air flow measuring device

  • US 20100095753A1
  • Filed: 12/15/2009
  • Published: 04/22/2010
  • Est. Priority Date: 06/14/2007
  • Status: Active Grant
First Claim
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1. An air flow measuring device for measuring a flow amount of air flowing in an interior of a duct, the air flow measuring device comprising:

  • a first sub-passage portion configured to introduce therein a part of air flowing in the duct;

    a throttle portion provided in the first sub-passage portion to gradually reduce a passage sectional area of the first sub-passage portion as toward an outlet of the first sub-passage portion;

    a second sub-passage portion branched from the first sub-passage portion at an upstream side of the throttle portion in a flow direction of air flowing in the first sub-passage portion, the second sub-passage portion being configured to introduce therein a part of air flowing in the first sub-passage portion; and

    a flow amount sensor located in the second sub-passage portion to measure a flow amount of air flowing in the second sub-passage portion, wherein;

    the second sub-passage portion has an inlet at which the second sub-passage portion is branched from the first sub-passage portion;

    the inlet of the second sub-passage portion is open into the first sub-passage portion at one side in a first radial direction that is perpendicular to a flow direction of air flowing in the first sub-passage portion;

    the throttle portion is provided to gradually reduce a passage dimension of the first sub-passage portion in a second radial direction, as toward the outlet of the first sub-passage portion, the second radial direction being perpendicular to a first plane extending in the first radial direction and extending in the flow direction of air flowing in the first sub-passage portion; and

    the throttle portion is provided solely along a downstream side portion in the first sub-passage portion, downstream of the opening of the inlet of the second sub-passage portion.

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