US3837762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumps
Assignee: English Electric Co Ltd
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Filing: 1973-05-30
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Granted: 1974-09-24
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Expires: 1993-05-30
Abstract
Abstract A pump assembly having a chamber into which a pump is arranged to discharge, and a plurality of outlet pipes each having one end extending into the chamber, the wall of each outlet pipe at said one end being of streamline form, and the part of each pipe extending away from said one end being in the form of a diffuser of gradually increasing internal cross-sectional area with increasing distance from the said one end.
Inventors
- 👤 A Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:33
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/445; F04D29/66; F04D29/669; F04D7/00; F04D7/02; F04D7/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
A pump assembly comprising: a. a pump; b. a chamber into which the pump is arranged to discharge; c. at least one outlet pipe in communication at one of its ends with the interior of the chamber; d. a wall defining each outlet pipe at said one of its ends being of streamline form; e. a part of each outlet pipe extending away from the said one end thereof being in the form of a diffuser of gradually increasing internal cross-sectional area with increasing distance from the said one end of the outlet pipe; f. the total internal cross-sectional area of the said one end of the outlet pipes being small compared with the internal cross-sectional area of the chamber; and g. the said one end of each outlet pipe opening abruptly into the much greater cross-sectional area of the chamber so that the arrangement of outlet pipes and chamber acts as a fluid diode.
Claim 2
Dependent Claim
155 words
A pump assembly comprising: a. a pump; b. a chamber into which the pump is arranged to discharge; c. at least one outlet pipe in communication at one of its ends with the interior of the chamber; d. a wall defining each outlet pipe at said one of its ends being of streamline form; e. a part of each outlet pipe extending away from the said one end thereof being in the form of a diffuser of gradually increasing internal cross-sectional area with increasing distance from the said one end of the outlet pipe; f. the total internal cross-sectional area of the said one end of the outlet pipes being small compared with the internal cross-sectional area of the chamber; and g. the said one end of each outlet pipe opening abruptly into the much greater cross-sectional area of the chamber so that the arrangement of outlet pipes and chamber acts as a fluid diode.
Claim 3
Dependent Claim
55 words
A pump assembly as claimed in claim 1, wherein the pump comprises a rotary centrifugal impeller, and there is provided a further annular axial diffuser having a first end arranged to receive pumped fluid from the impeller and a second end, of greater annular cross-sectional area than the first end, opening into the said chamber.
Claim 4
Dependent Claim
125 words
A pump assembly as claimed in claim 2 wherein the second end of said annular axial diffuser constitutes a peripheral wall section of said chamber into which its second end opens peripherally, and each outlet pipe extends into the chamber in the axial direction of the said annular axial diffuser with its said one end directed oppositely to and away from the second end of the annular axial diffuser, whereby fluid flowing from the impeller flows in one axial direction through the annular axial diffuser and through each diffuser formed by a part of an outlet pipe, but flows in the opposite axial direction while flowing, within said chamber, from said annular axial diffuser to each diffuser formed by a part of an outlet pipe.
Claim 5
Dependent Claim
35 words
A pump assembly as claimed in claim 3 wherein the pump is located above the chamber and each outlet pipe extends downwards from the chamber with the said one end extending upwards into the chamber.
Claim 6
Dependent Claim
20 words
A pump assembly as claimed in claim 4 having four outlet pipes in communication with the interior of the chamber.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |