US5498124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative pump and casing thereof
Assignee: Denso Corp
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Filing: 1994-02-02
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Granted: 1996-03-12
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Expires: 2014-02-02
Abstract
Abstract A regenerative pump includes a casing which a recessed fluid flow passage interconnecting a suction port and a discharge port is formed in an arcuate shape. An impeller is provided rotatably with respect to the casing and formed with a plurality of vane members which face the recessed fluid flow passage. A recessed damping portion is formed in a terminal end portion of the recessed fluid flow passage on a discharge port side thereof to begin at a position corresponding to the discharge port and extend along a rotating direction of the impeller. The recessed damping portion has a depth which is smaller than that of a main depth of the recessed fluid flow passage and substantially constant.
Inventors
- 👤 Motoya Ito
- 👤 Minoru Yasuda
- 👤 Atsushige Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:21
CPC Classifications
F; F04; F04D; F04D1/00; F04D5/00; F04D5/002; F04D29/00; F04D29/66; F04D29/669; F04D5/007; F05; F05B; F05B2250/00; F05B2250/50; F05B2250/503
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
120 words
A regenerative pump comprising: a casing which a recessed fluid flow passage interconnecting a suction port and a discharge port is formed in an arcuate shape; and an impeller provided rotatably with respect to said casing and formed with a plurality of vane members which face said recessed fluid flow passage, wherein a recessed damping portion is formed in a terminal end portion of said recessed fluid flow passage on a discharge port side thereof to begin at a position corresponding to the discharge port and extend along a rotating direction of said impeller, and said recessed damping portion has a depth which is smaller than that of a main depth of said recessed fluid flow passage and substantially constant.
Claim 2
Dependent Claim
120 words
A regenerative pump comprising: a casing which a recessed fluid flow passage interconnecting a suction port and a discharge port is formed in an arcuate shape; and an impeller provided rotatably with respect to said casing and formed with a plurality of vane members which face said recessed fluid flow passage, wherein a recessed damping portion is formed in a terminal end portion of said recessed fluid flow passage on a discharge port side thereof to begin at a position corresponding to the discharge port and extend along a rotating direction of said impeller, and said recessed damping portion has a depth which is smaller than that of a main depth of said recessed fluid flow passage and substantially constant.
Claim 3
Dependent Claim
32 words
A regenerative pump according to claim 1, wherein said recessed damping portion is defined by a boundary line which causes each vane member of said impeller to enter a partition portion gradually.
Claim 4
Dependent Claim
107 words
A regenerative pump according to claim 2, wherein said casing extends in a range which holds said impeller from both opposite sides thereof, said recessed fluid flow passage includes a first section which faces one of surfaces of said impeller and a second section which faces the other surface of said impeller, the discharge port extends from a terminal end of said first section perpendicularly to the surfaces of said impeller, and said damping portion is formed at least in a terminal end portion of said second section and further extends from a vertically projected position of said discharge port along the rotating direction of the impeller.
Claim 5
Dependent Claim
28 words
A regenerative pump according to claim 1, wherein said recessed damping portion is surrounded by a vertical wall which extends substantially perpendicularly to inner surfaces of said casing.
Claim 6
Dependent Claim
29 words
A regenerative pump according to claim 4, wherein said vertical wall includes a wall surface which permits each vane member of said impeller to enter a partition portion gradually.
Claim 7
Dependent Claim
107 words
A regenerative pump according to claim 5, wherein said casing extends in a range which holds said impeller from both opposite sides thereof, said recessed fluid flow passage includes a first section which faces one of surfaces of said impeller and a second section which faces the other surface of said impeller, the discharge port extends from a terminal end of said first section perpendicularly to the surfaces of said impeller, and said damping portion is formed at least in a terminal end portion of said second section and further extends from a vertically projected position of the discharge port along the rotating direction of said impeller.
Claim 8
Dependent Claim
22 words
A regenerative pump according to claim 6, wherein another damping portion is formed in the terminal end portion of said first section.
Claim 9
Dependent Claim
39 words
A regenerative pump according to claim 7, wherein said impeller is formed in a disk-like shape, and the vane members are formed to extend continuously from one of end faces of said impeller to the other end face thereof.
Claim 10
Dependent Claim
25 words
A regenerative pump according to claim 8, wherein the vane members of said impeller are concave with respect to the rotating direction of said impeller.
Claim 11
Dependent Claim
17 words
A regenerative pump according to claim 9, wherein the pump supplies fuel to an internal combustion engine.
Claim 12
Dependent Claim
105 words
A regenerative pump according to claim 1, wherein said casing extends in a range which holds said impeller from opposite sides, said recessed fluid flow passage includes a first section which faces one of surfaces of said impeller and a second section which faces the other surface of said impeller, the discharge port extends from a terminal end of said first section perpendicularly to the surfaces of said impeller, and said damping portion is formed at least in a terminal end portion of said second section and further extends from a vertically projected position of the discharge port along the rotating direction of said impeller.
Claim 13
Dependent Claim
36 words
A regenerative pump according to claim 1, wherein said impeller is formed in a disk-like shape, and the vane members are formed individually on one end face of said impeller and on another end face thereof.
Claim 14
Dependent Claim
114 words
A regenerative pump comprising: a casing in which a recessed fluid flow passage interconnecting a suction port and a discharge port is formed in an arcuate shape; and an impeller provided rotatably with respect to the formed with a plurality of vane members which face the recessed fluid flow passage, wherein a recessed damping portion is formed in a terminal end portion of said recessed fluid flow passage on a discharge port side thereof to begin at a position corresponding to the discharge port and extend along a rotating direction of said impeller, and said recessed damping portion is surrounded by a vertical wall which extends substantially perpendicularly to inner surfaces of said casing.
Claim 15
Dependent Claim
114 words
A regenerative pump comprising: a casing in which a recessed fluid flow passage interconnecting a suction port and a discharge port is formed in an arcuate shape; and an impeller provided rotatably with respect to the formed with a plurality of vane members which face the recessed fluid flow passage, wherein a recessed damping portion is formed in a terminal end portion of said recessed fluid flow passage on a discharge port side thereof to begin at a position corresponding to the discharge port and extend along a rotating direction of said impeller, and said recessed damping portion is surrounded by a vertical wall which extends substantially perpendicularly to inner surfaces of said casing.
Claim 16
Dependent Claim
29 words
A regenerative pump according to claim 13, wherein said vertical wall includes a wall surface which permits each vane member of said impeller to enter a partition portion gradually.
Claim 17
Dependent Claim
106 words
A regenerative pump according to claim 14, wherein said casing extends in a range which holds said impeller from both opposite sides, said recessed fluid flow passage includes a first section which faces one of surfaces of said impeller and a second section which faces the other surface of said impeller, the discharge port extends from a terminal end of said first section perpendicularly to the surfaces of said impeller, and said damping portion is formed at least in a terminal end portion of said second section and further extends from a vertically projected position of the discharge port along the rotating direction of said impeller.
Claim 18
Dependent Claim
22 words
A regenerative pump according to claim 15, wherein another damping portion is formed in the terminal end portion of said first section.
Claim 19
Dependent Claim
39 words
A regenerative pump according to claim 16, wherein said impeller is formed in a disk-like shape, and the vane members are formed to extend continuously from one of end faces of said impeller to the other end face thereof.
Claim 20
Dependent Claim
25 words
A regenerative pump according to claim 17, wherein the vane members of said impeller are concave with respect to the rotating direction of said impeller.
Claim 21
Dependent Claim
17 words
A regenerative pump according to claim 18, wherein the pump supplies fuel to an internal combustion engine.
Claim 22
Dependent Claim
105 words
A regenerative pump according to claim 13, wherein said casing extends in a range which holds said impeller from opposite sides, said recessed fluid flow passage includes a first section which faces one of surfaces of said impeller and a second section which faces the other surface of said impeller, said discharge port extends from a terminal end of said first section perpendicularly to the surfaces of said impeller, and said damping portion is formed at least in a terminal end portion of said second section and further extends from a vertically projected position of the discharge port along the rotating direction of said impeller.
Claim 23
Dependent Claim
36 words
A regenerative pump according to claim 13, wherein said impeller is formed in a disk-like shape, and the vane members are formed individually on one end face of said impeller and on another end face thereof.
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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) | 1999-03-12 | 1999-09-11 | 2000-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-12 | 2003-09-11 | 2004-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-12 | 2007-09-11 | 2008-03-12 | $7700.00 | Window Closed / Lapsed |