US3817446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pitot pump with centrifugal separator
Assignee: KABE Inc
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Filing: 1973-01-08
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Granted: 1974-06-18
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Expires: 1993-01-08
Abstract
Abstract A pitot pump, i.e., a centrifugal pump comprising a rotating casing, means for delivering the fluid to be pumped to the interior of the casing, a pitot tube fixed within and extending radially of the rotating casing, and a discharge duct for the pitot tube coaxial with the rotating casing. A structure for removing heavier material from the fluid being pumped and including a plurality of peripheral nozzles in the rotating casing, an annular passage feeding the nozzles, and a plurality of strainer passages feeding the annular passage from the interior of the rotating casing.
Inventors
- 👤 J Erickson
- 👤 V Budrys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:55
CPC Classifications
B; B04; B04B; B04B5/00; F; F04; F04D; F04D1/00; F04D1/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
211 words
In a pitot pump adapted to pump a liquid containing undesirable heavier material, the combination of: a generally cylindrical rotary casing rotatable about its central axis, including an annular pump chamber having an annular outer wall; means for delivering such a liquid to be pumped to said pump chamber; means for rotating said casing and chamber in one direction to impart a velocity to said liquid in said direction and cause heavier material therein to tend to stratify adjacent said annular outer wall; a stationary pitot tube in said chamber and extending radially therein, said pitot tube having adjacent its outer end an inlet opening radially inwardly of said annular wall facing in a direction opposite to said one direction of rotation of said rotary casing; and a discharge duct coaxial with sAid rotary casing and communicating with the inner end of said pitot tube; said annular outer wall including orifice means therethrough, having a cross-sectional area great enough to permit the passage of particles contained in the liquid in said chamber to a point outside said casing but having a total effective crosssectional area sufficiently smaller than that of said inlet opening to prevent a substantial pressure drop in the outer portion of said chamber during rotation of said casing.
Claim 2
Dependent Claim
211 words
In a pitot pump adapted to pump a liquid containing undesirable heavier material, the combination of: a generally cylindrical rotary casing rotatable about its central axis, including an annular pump chamber having an annular outer wall; means for delivering such a liquid to be pumped to said pump chamber; means for rotating said casing and chamber in one direction to impart a velocity to said liquid in said direction and cause heavier material therein to tend to stratify adjacent said annular outer wall; a stationary pitot tube in said chamber and extending radially therein, said pitot tube having adjacent its outer end an inlet opening radially inwardly of said annular wall facing in a direction opposite to said one direction of rotation of said rotary casing; and a discharge duct coaxial with sAid rotary casing and communicating with the inner end of said pitot tube; said annular outer wall including orifice means therethrough, having a cross-sectional area great enough to permit the passage of particles contained in the liquid in said chamber to a point outside said casing but having a total effective crosssectional area sufficiently smaller than that of said inlet opening to prevent a substantial pressure drop in the outer portion of said chamber during rotation of said casing.
Claim 3
Dependent Claim
28 words
A device as defined in claim 1, in which the outer portion of the pump chamber is generally v-shaped and the apex thereof communicates with said orifice means.
Claim 4
Dependent Claim
65 words
A device as defined in claim 1, in which said outer wall of said casing includes an annular passage between said pump chamber and said orifice means and coaxial with said casing and in which said outer wall of said casing includes strainer means between said annular passage and pump chamber and having passage means providing flow between said annular passage and said orifice means.
Claim 5
Dependent Claim
22 words
A device as defined in claim 3, including a plurality of said orifice means circumferentially spaced from each other around said casing.
Claim 6
Dependent Claim
47 words
A device as defined in claim 3, wherein the relative sizes of said strainer means passage means and said orifice means is such that during rotation of said casing the pressure drop across said strainer means is substantially less than the pressure drop across said orifice means.
Claim 7
Dependent Claim
36 words
A device as defined in claim 1, including a closed, stationary shell surrounding said rotary casing, with which said orifice means communicates, said shell collecting material discharged from said orifice means upon rotation of said casing.
Claim 8
Dependent Claim
33 words
A device as defined in claim 1 wherein said orifice means includes a plurality of discharge nozzles directed generally tangential to said casing in a direction opposite to the rotation of said casing.
Claim 9
Dependent Claim
47 words
A device as defined in claim 7 wherein said outer wall of said casing includes an annular passage coaxial with said casing and a plurality of strainer passages, providing fluid flow paths from said chamber through said strainer passages and said annular passage to said discharge nozzles.
Claim 10
Dependent Claim
55 words
A device as defined in claim 8 wherein each of said strainer passages comprises a relatively large upstream collection zone and a relatively small downstream zone, with the total cross-section area of said downstream zone is greater than the total cross-section area of said orifice means discharge nozzles by at least a factor of two.
Claim 11
Dependent Claim
31 words
A device as defined in claim 8 wherein each of said strainer passages includes an outlet opening obliquely into said annular passage in a direction opposite to rotation of said casing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |