US3866469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectangular flowmeter
Assignee: Delta Engineering Holdings Ltd
•
Filing: 1973-12-13
•
Granted: 1975-02-18
•
Expires: 1993-12-13
Abstract
Abstract A fluid flowmeter comprising a rotor with radially-directed, axially-extending blades borne for rotation within a chamber of rectangular cross-section wherein the blades are exposed to a substantially tangential flow. The number of revolutions imparted to the rotor thereby are counted as a measure of the fluid passed. Rods are situated in one or more corners of the chamber to guide the flow around the chamber by the promotion of stable fluid vortices in the corners.
Inventors
- 👤 William Alexander Wemyss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:57
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
157 words
A fluid flowmeter comprising: a body defining a chamber of substantially rectangular crosssection having four side walls extending between substantially parallel top and bottom walls; a metering rotor having radially-directed, axially extending blades borne for rotation with said chamber; means defining a fluid inlet and a fluid outlet, opening to said chamber through the same of different side walls of the chamber; said inlet including a nozzle for directing a jet of incoming fluid towards and substantially tangential to the rotor; means arranged within the chamber for guiding such incoming fluid around the chamber to the outlet which means comprises: a rod like member extending between said top and bottom walls of the chamber situated in one or more corners of the chamber, the axis of the or each such member being substantially parallel with that of the rotor; and means for sensing the number of revolutions of the rotor to signal the amount of fluid passed.
Claim 2
Dependent Claim
157 words
A fluid flowmeter comprising: a body defining a chamber of substantially rectangular crosssection having four side walls extending between substantially parallel top and bottom walls; a metering rotor having radially-directed, axially extending blades borne for rotation with said chamber; means defining a fluid inlet and a fluid outlet, opening to said chamber through the same of different side walls of the chamber; said inlet including a nozzle for directing a jet of incoming fluid towards and substantially tangential to the rotor; means arranged within the chamber for guiding such incoming fluid around the chamber to the outlet which means comprises: a rod like member extending between said top and bottom walls of the chamber situated in one or more corners of the chamber, the axis of the or each such member being substantially parallel with that of the rotor; and means for sensing the number of revolutions of the rotor to signal the amount of fluid passed.
Claim 3
Dependent Claim
30 words
The flowmeter of claim 1 wherein a rod-like member is situated in each corner of the chamber encountered by fluid flowing around the chamber from said inlet to said outlet.
Claim 4
Dependent Claim
43 words
The flowmeter of claim 2 wherein the nozzle is in the form of an ecceNtrically bored insert borne in a side wall of the chamber so that the alignment of the nozzle is adjustable relative to the rotor by rotation of said insert.
Claim 5
Dependent Claim
42 words
The flowmeter of claim 1 wherein said inlet and outlet open into the chamber through the same side wall of the chamber, and a rod-like member is situated in one or both of the two corners remote from said same side wall.
Claim 6
Dependent Claim
51 words
The flowmeter of claim 1 wherein said inlet and outlet open into the chamber through the same side wall of the chamber, at positions spaced from the next nearest side wall and a rod-like member is situated in one or both of the two corners adjacent to said same side wall.
Claim 7
Dependent Claim
17 words
The flowmeter of claim 1 wherein at least one rod-like member is adjustable as to its position.
Claim 8
Dependent Claim
33 words
The flowmeter of claim 6 wherein said member is borne eccentrically in said top and bottom walls of the chamber so that the member is adjustable as to its position by rotation thereof.
Claim 9
Dependent Claim
17 words
The flowmeter of claim 1 wherein the alignment of said nozzle relative to the rotor is adjustable.
Claim 10
Dependent Claim
39 words
The flowmeter of claim 1 wherein at least one rotor blade embodies a magnetic element in its tip to cause pulses in an inductive sensor in proximity to the chamber, thereby sensing the number of revolutions of the rotor.
Claim 11
Dependent Claim
41 words
The flowmeter of claim 1 wherein means are provided in the region of the outlet opening to the chamber to deflect a flow of fluid entering the chamber from the outlet from impingement on the rotor sufficient to overspeed the same.
Claim 12
Dependent Claim
64 words
The flowmeter of claim 10 wherein said deflecting means comprises a baffle member arranged to partially occlude the outlet opening so as to direct a flow of fluid entering the chamber from the outlet around the chamber to the inlet with components of direction tending to rotate the rotor in both senses, any net rotation being within the normal operational range of the rotor.
Claim 13
Dependent Claim
86 words
The flowmeter of claim 11 wherein said inlet and outlet open into the chamber through the same side wall of the chamber, at positions spaced from the next nearest side wall, and a rod-like member is situated in each of the two corners adjacent to said same side wall, said baffle member being in the form of a clip sprung over said two rod-like members, the clip being notched to allow unimpeded forward flow from the inlet but leaving a portion partially occluding the outlet opening.
Claim 14
Dependent Claim
23 words
The flowmeter of claim 11 wherein said baffle member is prismatic with an apex pointing upstream in the reverse sense of fluid flow.
References Cited (Backward Citations)
US2525914A
Cited
US2963907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |