Patent US3740166A successfully refreshed from Google Patents.
US3740166A
Expired / Lapsed
US
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Slurry pump of oil-diaphragm type
Assignee: Mitsubishi Shindoh Co Ltd
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Filing: 1971-04-19
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Granted: 1973-06-19
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Expires: 1991-04-19
Abstract
Abstract In a riser portion of the slurry connecting pipe between the valve box and the diaphragm chamber of an oil-diaphragm slurry pump having a plunger pump, there is installed a pipe part of large cross section having an interior of a volume greater than the suction displacement of the plunger pump and of a configuration such as to provide abruptly changing cross sectional area with respect to slurry flow therein, whereby turbulent flow, eddy flow or vortices are continually formed in the slurry during pump operation thereby to prevent settling of solid particles.
Inventors
- 👤 K Seki
- 👤 T Kazama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:53
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/14; F04B53/141; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
In an oil-diaphragm slurry pump comprising a plunger pump of a certain suction displacement, a valve box for pumping slurry, and an oil-diaphragm chamber communicating by way of an oil path with the plunger pump and communicating with the valve box by way of a slurry connecting pipe having a riser portion, the improvement wherein said riser portion has a pipe part of enlarged cross-sectional area, said pipe part having an internal volume greater than the volume by which the plunger pump makes said suction displacement and also having such an internal configuration that the cross-sectional area of the slurry flowpath through the pipe part is abruptly and discontinuously changed at least at both ends of the pipe part, said pipe part having therewithin baffle plates for generating vortices in the slurry flow in the pipe part during operation of the slurry pump.
Claim 2
Dependent Claim
143 words
In an oil-diaphragm slurry pump comprising a plunger pump of a certain suction displacement, a valve box for pumping slurry, and an oil-diaphragm chamber communicating by way of an oil path with the plunger pump and communicating with the valve box by way of a slurry connecting pipe having a riser portion, the improvement wherein said riser portion has a pipe part of enlarged cross-sectional area, said pipe part having an internal volume greater than the volume by which the plunger pump makes said suction displacement and also having such an internal configuration that the cross-sectional area of the slurry flowpath through the pipe part is abruptly and discontinuously changed at least at both ends of the pipe part, said pipe part having therewithin baffle plates for generating vortices in the slurry flow in the pipe part during operation of the slurry pump.
Claim 3
Dependent Claim
20 words
An oil-diaphragm slurry pump according to claim 1 in which said baffle plates are in the form of orifice plates.
References Cited (Backward Citations)
DE1193368B
Cited
US3241496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |