US4324144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine flowmeter
Assignee: Tokico Ltd
•
Filing: 1979-01-03
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Granted: 1982-04-13
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Expires: 1999-01-03
Abstract
Abstract This invention relates to a turbine flowmeter comprising an impeller with blades rotatably mounted in a casing and a detection means provided to detect the revolutions of said impeller as a change of electrostatic capacity.
Inventors
- 👤 Yasuji Miyata
- 👤 Kazuhiko Hirose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:36
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/10; G01F1/106
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
A turbine flowmeter comprising (a) cylindrical casing, (b) a passage defined by an inner space of the casing for conducting a fluid to be measured, (c) an impeller rotatably supported within the casing in the passage, said impeller having a rotator with a number of blades fixed on the outer surface of the rotator, (d) guide members for guiding the fluid in the passage and disposed on the upstream side and downstream side of the impeller, respectively, (e) an annular recess provided within the casing adjacent to the free end of a blade in the direction of rotation of the impeller, the free end portion of the blade being positioned in the annular recess, and (f) a pair of electrode plates for detecting the rotation of the impeller as a change of electrostatic capacity, said electrode plates being fixed in the recess of the casing without projecting into the passage and being disposed in opposition to each other at a distance.
Claim 2
Dependent Claim
161 words
A turbine flowmeter comprising (a) cylindrical casing, (b) a passage defined by an inner space of the casing for conducting a fluid to be measured, (c) an impeller rotatably supported within the casing in the passage, said impeller having a rotator with a number of blades fixed on the outer surface of the rotator, (d) guide members for guiding the fluid in the passage and disposed on the upstream side and downstream side of the impeller, respectively, (e) an annular recess provided within the casing adjacent to the free end of a blade in the direction of rotation of the impeller, the free end portion of the blade being positioned in the annular recess, and (f) a pair of electrode plates for detecting the rotation of the impeller as a change of electrostatic capacity, said electrode plates being fixed in the recess of the casing without projecting into the passage and being disposed in opposition to each other at a distance.
Claim 3
Dependent Claim
42 words
A turbine flowmeter as claimed in claim 1, wherein said electrode plates are so disposed that one of the plates is close to the front edge of the blade while the other plate is close to the rear edge of the blade.
Claim 4
Dependent Claim
25 words
A turbine flowmeter as claimed in any one of claim 1, or 2, wherein the electrode plates are electrically insulated by quartz from each other.
Claim 5
Dependent Claim
112 words
A turbine flowmeter comprising an impeller rotatably supported in a casing and provided with blades, and a detection means adapted to detect the revolutions of the impeller as a change of electrostatic capacity, wherein, in order to improve the signal to noise ratio in the detected signal, said detection means comprises a first electrode plate fixed on the casing at the location of a groove formed in the inner face of the casing in the direction of rotation of the impeller, and a second electrode provided in the casing adjacently to said first electrode plate and spaced therefrom, the free end portion of each of the blades being positioned in said groove.
Claim 6
Dependent Claim
112 words
A turbine flowmeter comprising an impeller rotatably supported in a casing and provided with blades, and a detection means adapted to detect the revolutions of the impeller as a change of electrostatic capacity, wherein, in order to improve the signal to noise ratio in the detected signal, said detection means comprises a first electrode plate fixed on the casing at the location of a groove formed in the inner face of the casing in the direction of rotation of the impeller, and a second electrode provided in the casing adjacently to said first electrode plate and spaced therefrom, the free end portion of each of the blades being positioned in said groove.
Claim 7
Dependent Claim
15 words
A turbine flowmeter as claimed in claim 4, wherein said second electrode comprises said blade.
Claim 8
Dependent Claim
23 words
A turbine flowmeter as claimed in claim 5, wherein the first electrode plate is configured correspondingly to the sectional shape of the groove.
Claim 9
Dependent Claim
17 words
A turbine flowmeter as claimed in claim 6, wherein the first electrode plate is U-shaped in section.
Claim 10
Dependent Claim
42 words
A turbine flowmeter as claimed in claim 4, wherein said second electrode comprises a second electrode plate fixed on the casing at the location of said groove, said free end portion of each of the blades being positioned between said electrode plates.
Claim 11
Dependent Claim
44 words
A turbine flowmeter as claimed in claim 8, wherein said electrode plates are so arranged that one of said electrode plates is close to the front edge of the blade while the other electrode plate is close to the rear edge of the blade.
References Cited (Backward Citations)
US2455345A
Cited
GB606278A
Cited
US2723562A
Cited
US3208269A
Cited
US3377556A
Cited
US4164866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |