US3902823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller for gas-handling apparatus
Assignee: Hitachi Ltd
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Filing: 1974-06-24
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Granted: 1975-09-02
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Expires: 1994-06-24
Abstract
Abstract An impeller for, such as, gas compressors and blowers, fans, etc. comprising an impeller made of a martensite alloy steel consisting essentially of 0.06-0.15 % of carbon, 11-13.5 % of chromium, 1.5 to 3 % of nickel, 0.7 to 2 % of molybdenum, 0.03 to 0.6 % of niobium, up to 1 % of silicon, 0.2 to 2 % of manganese, up to 0.2 % of nitrogen and the balance of iron and incidental impurities has highly improved strength, toughness and corrosion resistance.
Inventors
- 👤 Akira Minato
- 👤 Tsutomu Shimizu
- 👤 Akira Nishimatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:56
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/281; C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/48; F04D29/02; F04D29/023; F05; F05D; F05D2260/00; F05D2260/95; F05D2300/00; F05D2300/10; F05D2300/17; F05D2300/171
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
166 words
An impeller for gas handling apparatus comprising a pair of annular plates, a plurality of blades arranged in concentric relation with each other and fixed to each of the plates in the substantially axial direction, and a shaft disposed in the center of the arranged blades, said plates and blades being made of a martensite alloy steel consisting essentially of, based on weight, 0.06 to 0.15 % of carbon, 11 to 13.5 % of chromium, 1.5 to 3 % of nickel, 0.7 to 2 % of molybdenum, 0.03 to 0.6 % niobium, up to 1 % of silicon, 0.2 to 2 % of manganese, up to 0.2 % of nitrogen, up to 0.2 % in a total amount of at least one member selected from the group consisting of aluminum, titanium, calcium, magnesium and rare earth elements, and the balancE substantially iron, amounts of chromium, silicon, molyblenum, niobium, nickel, manganese and nitrogen being adjusted so that chromium equivalent is within the range of 7 to 13.
Claim 2
Dependent Claim
166 words
An impeller for gas handling apparatus comprising a pair of annular plates, a plurality of blades arranged in concentric relation with each other and fixed to each of the plates in the substantially axial direction, and a shaft disposed in the center of the arranged blades, said plates and blades being made of a martensite alloy steel consisting essentially of, based on weight, 0.06 to 0.15 % of carbon, 11 to 13.5 % of chromium, 1.5 to 3 % of nickel, 0.7 to 2 % of molybdenum, 0.03 to 0.6 % niobium, up to 1 % of silicon, 0.2 to 2 % of manganese, up to 0.2 % of nitrogen, up to 0.2 % in a total amount of at least one member selected from the group consisting of aluminum, titanium, calcium, magnesium and rare earth elements, and the balancE substantially iron, amounts of chromium, silicon, molyblenum, niobium, nickel, manganese and nitrogen being adjusted so that chromium equivalent is within the range of 7 to 13.
Claim 3
Dependent Claim
165 words
An impeller for gas handling apparatus comprising a pair of annular plates, plurality of blades arranged in concentric relation with each other and fixed to each of the plates in substantially axial direction and a shaft disposed in the center of the arranged blades, said plates and blades being made of a martensite alloy steel consisting essentially of, based on weight, 0.07 to 0.11 % of carbon, 11.5 to 12.5 % of chromium, 1.8 to 2.2 % of nickel, 0.8 to 1.2 % of molybdenum, 0.1 to 0.3 % of niobium, up to 1 % of silicon, 0.2 to 2 % of manganese, up to 0.2 % of nitrogen, up to 0.2 % in a total amount of at least one member selected from the group consisting of aluminum, titanium, calcium, manganese and rare earth elements, and the balance substantially iron, amounts of chromium, silicon, molybdenum, niobium, nickel, magnanese and nitrogen being adjusted so that chromium equivalent is within the range of 7 to 13.
Claim 4
Dependent Claim
165 words
An impeller for gas handling apparatus comprising a pair of annular plates, plurality of blades arranged in concentric relation with each other and fixed to each of the plates in substantially axial direction and a shaft disposed in the center of the arranged blades, said plates and blades being made of a martensite alloy steel consisting essentially of, based on weight, 0.07 to 0.11 % of carbon, 11.5 to 12.5 % of chromium, 1.8 to 2.2 % of nickel, 0.8 to 1.2 % of molybdenum, 0.1 to 0.3 % of niobium, up to 1 % of silicon, 0.2 to 2 % of manganese, up to 0.2 % of nitrogen, up to 0.2 % in a total amount of at least one member selected from the group consisting of aluminum, titanium, calcium, manganese and rare earth elements, and the balance substantially iron, amounts of chromium, silicon, molybdenum, niobium, nickel, magnanese and nitrogen being adjusted so that chromium equivalent is within the range of 7 to 13.
Claim 5
Dependent Claim
46 words
An impeller according to claim 1, wherein one of the plates has a gas inlet around the shaft, a section area of the gas inlet being smaller than a outlet formed between the blades whereby a gas introduced into the impeller is discharged from the outlet.
Claim 6
Dependent Claim
49 words
An impeller according to claim 2, wherein one of the plates has a gas inlet around the shaft, a section area of the gas inlet being larger than a outlet formed between the blades, whereby a gas introduced into the impeller is compressed therein and discharged from the outlet.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |