IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0373165
(2003-02-24)
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발명자
/ 주소 |
- Myers, Eric C.
- Zurek, Lawrence A.
- Caron, Richard W.
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| 출원인 / 주소 |
- Visteon Global Technologies, Inc.
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| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
0 인용 특허 :
69 |
초록
▼
A mass fluid flow sensor includes an internal bypass passage characterized by a first section that converges along a first axis to define a nozzle, and a radially-expanded generally-cylindrical second section immediately adjacent to and coaxial with the first section so as to define a radial step at
A mass fluid flow sensor includes an internal bypass passage characterized by a first section that converges along a first axis to define a nozzle, and a radially-expanded generally-cylindrical second section immediately adjacent to and coaxial with the first section so as to define a radial step at the nozzle exit. The passage further includes a semispherical third section adjacent to the second section having the same nominal diameter, a converging fourth section whose nominal axis is disposed at a right angle to the nominal axis of the first and second sections, and a fifth section adjacent to the fourth section that includes a further ninety degree bend. The resulting U-shaped passage features reduced pressure losses and an improved velocity profile, whereby the performance of a sensing element disposed in the passage proximate to the radial step is improved.
대표청구항
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1. A mass fluid flow sensor comprising:a housing adapted to be inserted in a fluid flow, the housing including an internal passage having an inlet in opposition to a primary direction of fluid flow and an outlet disposed at a predetermined angle with respect to the primary direction such that a mini
1. A mass fluid flow sensor comprising:a housing adapted to be inserted in a fluid flow, the housing including an internal passage having an inlet in opposition to a primary direction of fluid flow and an outlet disposed at a predetermined angle with respect to the primary direction such that a minimum pressure drop is developed at the outlet relative to the inlet as fluid flow in the primary direction passes over the housing, wherein the passage includes, in series, a first section converging along a first axis to define an annular nozzle having a nozzle diameter, a generally-right-cylindrical second section adjacent to the first section and extending along the first axis, the second section having a diameter greater than the nozzle diameter and defining a radial step immediately downstream of the nozzle, a third section adjacent to the second section and defining a generally-semi-spherical chamber centered on the first axis in opposition to the radial step, the third section having an effective radius substantially equal to one half of the diameter of the second section, and a fourth section adjacent to at least one of the second and third intermediate sections, the fourth section converging along a second axis to a minimum diameter, the second axis being disposed at a first, nonzero angle with respect to the first axis; and a sensing element supported by the housing within the passage proximate to the radial step. 2. The sensor of claim 1, wherein the minimum diameter of the fourth section is not less than the diameter of the second section.3. The sensor of claim 2, wherein the minimum diameter of the fourth section is substantially equal to the diameter of the second section.4. The sensor of claim 3, wherein the passage further includes a substantially-constant-diameter fifth section immediately adjacent to the fourth section, wherein the diameter of the fifth section is substantially equal to the minimum diameter of th fourth section.5. The sensor of claim 4, wherein the fifth section includes an arcuate bend characterized by a substantially-constant cross-sectional area through the bond.6. The sensor of claim 5, wherein the fifth section terminates along an outlet axis that is substantially parallel to the first axis of the first section.7. The sensor of claim 5, wherein the bend of the fifth section lies in a common plane with the first axis.8. The sensor of claim 1, wherein the juncture of the second, third and fourth sections of the passage includes an opposed pair of substantially flat passage surfaces.9. A fluid conduit defining an internal passage extending from a first region of relatively-higher pressure to a second region of relatively-lower pressure, wherein the passage redirects flow along a first axis to a second axis disposed at a nonzero angle with respect to the first axis, and wherein the passage is characterized by a plurality of adjoining sections includinga first section converging along the first axis to define an annular nozzle having a nozzle diameter, a generally-right-cylindrical second section adjacent to the first section and extending along the first axis, the second section having a diameter greater than the nozzle diameter and defining a radial step immediately downstream of the nozzle, a third section adjacent to the second section and defining a generally-semi spherical chamber centered on the first axis in opposition to the radial step, the third section having an effective radius substantially equal to one half of the diameter of the second section, and a fourth section adjacent to at least one of the second and third sections, the fourth section converging along the second axis to a minimum diameter, a juncture between the fourth section and the at least one of the second and third sections defining a pair of opposed flats within the passage. 10. The conduit of claim 9, wherein the minimum diameter of the fourth section is not less than the diameter of the second section.11. The conduit of claim 9, wherein the minimum diameter of the fourth section is substantially equal to the diameter of the second section.12. The conduit of claim 9 wherein the passage further includes a substantially-constant-diameter fifth section immediately adjacent to the fourth section, wherein tile diameter of the fifth section is substantially equal to the minimum diameter of the fourth section.13. The conduit of claim 12, wherein the fifth section includes an arcuate bend characterized by a substantially-constant cross-sectional area through the bend.14. The conduit of claim 13, wherein the fifth section terminates along an outlet axis that is substantially parallel to the first axis of the first section.15. The conduit of claim 12, wherein the bend of the fifth section lies in a common plane with the first axis of the first section.
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