US4150916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial flow inducers for hydraulic devices
Assignee: Nikkiso Co Ltd
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Filing: 1977-03-22
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Granted: 1979-04-24
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Expires: 1997-03-22
Abstract
Abstract An axial flow inducer for hydraulic devices is disclosed. The inducer is coaxially arranged in front of a fluid suction inlet side of a main impeller of an hydraulic device, for example, a pump and constituted by at least two axial flow blade parts which are constructed and arranged so as to prevent an occurrence of noise over all flow amount region of the impeller.
Inventors
- 👤 Toshiaki Tsutsui
- 👤 Akira Oyamada
- 👤 Tomomitsu Hamaguchi
- 👤 Akihiko Agata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:36
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2261; F04D29/2277; B; B01; B01F; B01F27/00; B01F27/60; B01F27/71; B01F27/711
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
An axial flow inducer for hydraulic devices comprising a pump casing, a rotary shaft rotatably journaled by said pump casing, a main impeller secured to said rotary shaft, and an inducer having axial flow blades coaxially arranged in front of a fluid suction inlet side of said main impeller a sleeve extending forwardly of the front of said inducer and having one end secured to the outer peripheral edge of said inducer and the opposite end bent inwardly and spaced from the front of said inducer so as to form a barrier, said axial flow blades being constructed and arranged so as to prevent an occurrence of noise over the region of said impeller.
Claim 2
Dependent Claim
114 words
An axial flow inducer for hydraulic devices comprising a pump casing, a rotary shaft rotatably journaled by said pump casing, a main impeller secured to said rotary shaft, and an inducer having axial flow blades coaxially arranged in front of a fluid suction inlet side of said main impeller a sleeve extending forwardly of the front of said inducer and having one end secured to the outer peripheral edge of said inducer and the opposite end bent inwardly and spaced from the front of said inducer so as to form a barrier, said axial flow blades being constructed and arranged so as to prevent an occurrence of noise over the region of said impeller.
Claim 3
Dependent Claim
34 words
An axial flow inducer for hydraulic devices as claimed in claim 1, wherein a design flow amount of said inducer is about 1.0 to 2 times the design flow amount of said main impeller.
Claim 4
Dependent Claim
28 words
An axial flow inducer for hydraulic devices according to claim 1, wherein said barrier is annular and forms a hole concentric with the axis of the rotary shaft.
Claim 5
Dependent Claim
85 words
An axial flow inducer for hydraulic devices according to claims 1 wherein the inducer comprises at least two stages of axial flow blades including a front stage axial flow blade part located at the fluid inlet side and a rear stage axial flow blade part, the outer diameter of said rear stage axial flow blade part being smaller than the outer diameter of said front stage axial flow part, and said sleeve is secured to the edge of the foremost blade of the front stage.
Claim 6
Dependent Claim
46 words
An axial flow inducer for hydraulic devices as claimed in claim 4, wherein a gap between the outer peripheral edge of said front stage axial flow blade part and the inside wall surface of the inlet of said pump chamber is confined as small as possible.
Claim 7
Dependent Claim
31 words
An axial flow inducer for hydraulic devices as claimed in claim 4, wherein said front stage axial flow blade part is detachably connected to the rear stage axial flow blade part.
Claim 8
Dependent Claim
59 words
An axial flow inducer for hydraulic devices as claimed in claim 4, wherein a difference between the outer diameter D 1 of said front stage axial flow blade part and the outer diameter D 2 of said rear stage axial flow blade part is defined by a formula given by D 1 -D 2 =(0.03 to 0.1)D 1 .
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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |