Air flow measuring device
First Claim
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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Accused Products
Abstract
An air flow measuring device has a throttle portion provided in a first sub-passage, a second sub-passage branched from the first sub-passage at an upstream side of the throttle portion, and a flow amount sensor located in the second sub-passage. The second sub-passage is configured to introduce therein a part of air flowing in the first sub-passage, and an inlet of the second sub-passage is open into the first sub-passage at one side in a first radial direction perpendicular to a flow direction of air flowing in the first sub-passage. Furthermore, the throttle portion is provided to gradually reduce a passage dimension of the first sub-passage in a second radial direction, as toward an outlet of the first sub-passage. Here, the second radial direction is perpendicular to a surface defined by the first radial direction and the flow direction of air in the first sub-passage.
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Citations
12 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification