US5160249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circumferential flow type fuel pump
Assignee: Mitsubishi Electric Corp
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Filing: 1990-11-13
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Granted: 1992-11-03
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Expires: 2010-11-13
Abstract
Abstract A circumferential flow type fuel pump has a circumferential fuel flow passage provided around an impeller and a gas discharging hole formed in the inner wall of the fuel flow passage in such a manner that the fuel flow passage is communicated with the outside of the fuel pump. The upstream and portion of the fuel flow passage extends to a position near the gas discharging hole and is formed into a flow passage enlarging part by increasing its sectional area radially outwardly, whereby the pumping capacity is substantially maintained unchanged even under severe operation conditions such as at a high fuel temperature.
Inventors
- 👤 Shingo Iwai
- 👤 Hiroshi Yoshioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
F; F02; F02M; F02M37/00; F02M37/04; F02M37/08; F02M37/048; F02M37/06; F02M37/20; F04; F04D; F04D5/00; F04D5/002; F04D5/007; F04D9/00; F04D9/001; F04D9/002; F04D9/003; F02D; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0606; F05; F05B; F05B2250/00; F05B2250/50; F05B2250/503
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A circumferential flow type fuel pump comprising: an impeller having a periphery; a circumferential fuel flow passage provided along the periphery of the impeller and having an inner wall, an outer wall having an upstream region and a downstream region distanced radially inward from the upstream region, and a gas discharging hole communicating between the inner wall and the outside of the pump, the fuel flow passage having a larger cross section along the upstream region than along the downstream region; and a fuel guide recess extending to the gas discharging hole from a start point which is located slightly upstream of and on a radially outward side of the gas discharging hole and passes obliquely through the fuel flow passage.
Claim 2
Dependent Claim
121 words
A circumferential flow type fuel pump comprising: an impeller having a periphery; a circumferential fuel flow passage provided along the periphery of the impeller and having an inner wall, an outer wall having an upstream region and a downstream region distanced radially inward from the upstream region, and a gas discharging hole communicating between the inner wall and the outside of the pump, the fuel flow passage having a larger cross section along the upstream region than along the downstream region; and a fuel guide recess extending to the gas discharging hole from a start point which is located slightly upstream of and on a radially outward side of the gas discharging hole and passes obliquely through the fuel flow passage.
Claim 3
Dependent Claim
122 words
A circumferential flow type fuel pump comprising: an impeller having a periphery and blade grooves on the periphery; a pump cover and a pump casing which rotatably support the impeller and define an arcuate fuel flow passage surrounding the impeller, the fuel flow passage having an arcuate upstream region and a linear flow passage adjoining the upstream region and comprising a chord of the fuel flow passage and having a smaller cross-sectional area than the upstream region; a fuel inlet provided in the pump cover and a fuel outlet provided in the casing, the inlet and the outlet communicating with the fuel flow passage; and a gas discharging hole communicating between the fuel flow passage and the outside of the fuel pump.
Claim 4
Dependent Claim
122 words
A circumferential flow type fuel pump comprising: an impeller having a periphery and blade grooves on the periphery; a pump cover and a pump casing which rotatably support the impeller and define an arcuate fuel flow passage surrounding the impeller, the fuel flow passage having an arcuate upstream region and a linear flow passage adjoining the upstream region and comprising a chord of the fuel flow passage and having a smaller cross-sectional area than the upstream region; a fuel inlet provided in the pump cover and a fuel outlet provided in the casing, the inlet and the outlet communicating with the fuel flow passage; and a gas discharging hole communicating between the fuel flow passage and the outside of the fuel pump.
Claim 5
Dependent Claim
41 words
A circumferential flow type fuel pump as claimed in claim 2 wherein the fuel flow passage comprises a downstream region having a larger cross-sectional area than the linear flow passage, the linear flow passage extending between the upstream and downstream regions.
Claim 6
Dependent Claim
41 words
A circumferential flow type fuel pump as claimed in claim 2 wherein the fuel flow passage has an inner wall and an outer wall, both of which have a smaller radius in the linear flow passage than in the upstream portion.
Claim 7
Dependent Claim
24 words
A circumferential flow type pump as claimed in claim 2 wherein the linear flow passage is closer to the inlet than to the outlet.
Claim 8
Dependent Claim
30 words
A circumferential flow type pump as claimed in claim 2 wherein the linear flow passage has an inner periphery, and the gas discharging hole is disposed along the inner periphery.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-03 | 1996-05-04 | 1996-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-03 | 2000-05-04 | 2000-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-03 | 2004-05-04 | 2004-11-03 | $7700.00 | Window Closed / Lapsed |