US3672398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accumulator for absorbing a pulsation of pump pressure
Assignee: Hitachi Ltd
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Filing: 1970-07-15
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Granted: 1972-06-27
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Expires: 1990-07-15
Abstract
Abstract An accumulator to be provided in a conduit leading from a pump for absorbing a pulsation of pump pressure, which is so constructed that the ratio of the diameter of the accumulator neck da to the diameter of the conduit dp is not smaller than 0.5, i.e. da/dp > OR = 0.5 and the ratio of the length of the neck dL to the diameter of the conduit dp is not larger than 0.5, i.e. dL/dp < OR = 0.5.
Inventors
- 👤 Ken Ichiryu
- 👤 Mitsuaki Takenoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:24
CPC Classifications
F; F04; F04B; F04B11/00; F04B11/0008; F04B11/0016; F16; F16L; F16L55/00; F16L55/04; F16L55/045; F16L55/05; F16L55/052; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85978; Y10T137/86035; Y10T137/86043
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
An accumulator for absorbing a pulsation of pump pressure comprising a cylindrical neck (21, 31) projecting outwardly from a conduit (20) connected to a pump, said neck defining a substantially cylindrical cavity (A) having a lower end directly opening to said conduit and an upper end closed with a cover (25), a substantially cylindrical rubber bag (23, 34) coaxially disposed in said cavity and sealingly secured at its upper end to said cover to form a gas containing chamber therein, and a gas inlet hole (26) provided on said cover for charging gas into said chamber, wherein the ratio of the inner diameter of said neck (cavity) da to the inner diameter of said conduit dp is not smaller than 0.5, i.e. da/dp > OR = 0.5, and the ratio of the length of said neck (cavity) dL to the inner diameter of said conduit dp is not larger than 0.5, i.e. dL/dp < OR = 0.5.
Claim 2
Dependent Claim
157 words
An accumulator for absorbing a pulsation of pump pressure comprising a cylindrical neck (21, 31) projecting outwardly from a conduit (20) connected to a pump, said neck defining a substantially cylindrical cavity (A) having a lower end directly opening to said conduit and an upper end closed with a cover (25), a substantially cylindrical rubber bag (23, 34) coaxially disposed in said cavity and sealingly secured at its upper end to said cover to form a gas containing chamber therein, and a gas inlet hole (26) provided on said cover for charging gas into said chamber, wherein the ratio of the inner diameter of said neck (cavity) da to the inner diameter of said conduit dp is not smaller than 0.5, i.e. da/dp > OR = 0.5, and the ratio of the length of said neck (cavity) dL to the inner diameter of said conduit dp is not larger than 0.5, i.e. dL/dp < OR = 0.5.
Claim 3
Dependent Claim
47 words
An accumulator as defined in claim 1, further comprising a stopper consisting of a screen disposed at the lower portion of said cavity for restricting the expansion of said rubber bag, said stopper being formed to permit free communication of fluid between said cavity and said conduit.
Claim 4
Dependent Claim
65 words
An accumulator as defined in claim 1, wherein said rubber bag is provided with a metal plate (35) adhesively secured to the entire outer surface of the bottom wall of said rubber bag and a seat (33) being formed on the peripheral wall of said cavity at the lower portion thereof to restrict the expansion of said rubbEr bag by contact with said metal plate.
Claim 5
Dependent Claim
47 words
An accumulator as defined in claim 1, wherein the peripheral wall of said rubber bag is outwardly bulged at the middle portion of the length thereof and the thickness of said peripheral wall is smallest at said middle portion and is progressively increased upwardly and downwardly therefrom.
Claim 6
Dependent Claim
18 words
An accumulator as defined in claim 2, wherein said screen is formed of a metal of large mesh.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |