US5388965A
Expired / Lapsed
US
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Sludge pump with monitoring system
Assignee: Friedrich Wilhelm Schwing GmbH
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Filing: 1993-03-19
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Granted: 1995-02-14
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Expires: 2013-03-19
Abstract
Abstract The present invention is a sludge pump system which includes a means for monitoring operation of a sludge pump. The sludge pump includes a material cylinder and a piston moveable in the material cylinder. A pump drive moves the piston during working cycles which include a pumping stroke and a filling stroke. A pump valve mechanism connects the material cylinder to an outlet during pumping strokes and connects the material cylinder to an inlet during filling strokes. A means for monitoring operation of the pump is provided. The means for monitoring includes a means for sensing a first parameter related to operation of the pump drive, a means for sensing a second parameter indicative of operation of the piston, and a means for determining errors in the operation of the pump based upon the first parameter and the second parameter.
Inventors
- 👤 Bethold A. Fehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:26
CPC Classifications
G; G01; G01F; G01F11/00; G01F11/02; G01F11/021; G01F11/029; F; F04; F04B; F04B13/00; F04B15/00; F04B15/02; F04B49/00; F04B49/06; F04B49/065; F04B2201/00; F04B2201/02; F04B2201/0201; F04B2201/0202; F04B2201/0209; F04B2201/06; F04B2201/0601; F04B2201/06012; F04B2201/12; F04B2201/1204; F04B2203/00; F04B2203/09; F04B2203/0901; F04B2203/0902; F04B2203/0903; F04B2203/091; F04B2205/00; F04B2205/05; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A sludge pump system comprising: a material cylinder; piston movable in the material cylinder; a pump drive for driving the piston during working cycles which include a pumping stroke and a filling stroke; pump valve means for connecting the material cylinder to an outlet during the pumping stroke and for connecting the material cylinder to an inlet during the filling stroke; and means for monitoring operation of the sludge pump, the means for monitoring comprising: means for sensing a first parameter related to operation of the pump drive, the first parameter being indicative of adjustment states of a throttle valve of the pump drive; means for sensing a second parameter indicative of operation of the piston; and means for determining errors in the operation of the pump based upon the first parameter and the second parameter.
Claim 2
Dependent Claim
136 words
A sludge pump system comprising: a material cylinder; piston movable in the material cylinder; a pump drive for driving the piston during working cycles which include a pumping stroke and a filling stroke; pump valve means for connecting the material cylinder to an outlet during the pumping stroke and for connecting the material cylinder to an inlet during the filling stroke; and means for monitoring operation of the sludge pump, the means for monitoring comprising: means for sensing a first parameter related to operation of the pump drive, the first parameter being indicative of adjustment states of a throttle valve of the pump drive; means for sensing a second parameter indicative of operation of the piston; and means for determining errors in the operation of the pump based upon the first parameter and the second parameter.
Claim 3
Dependent Claim
134 words
A sludge pump system comprising: a material cylinder; piston movable in the material cylinder; a pump drive for driving the piston during working cycles which include a pumping stroke and a filling stroke; pump valve means for connecting the material cylinder to an outlet during the pumping stroke and for connecting the material cylinder to an inlet during the filling stroke; and means for monitoring operation of the sludge pump, the means for monitoring comprising: means for sensing a first parameter related to operation of the pump drive, the first parameter being indicative of a hydraulic working pressure in the pump drive; means for sensing a second parameter indicative of operation of the piston; and means for determining errors in the operation of the pump based upon the first parameter and the second parameter.
Claim 4
Dependent Claim
134 words
A sludge pump system comprising: a material cylinder; piston movable in the material cylinder; a pump drive for driving the piston during working cycles which include a pumping stroke and a filling stroke; pump valve means for connecting the material cylinder to an outlet during the pumping stroke and for connecting the material cylinder to an inlet during the filling stroke; and means for monitoring operation of the sludge pump, the means for monitoring comprising: means for sensing a first parameter related to operation of the pump drive, the first parameter being indicative of a hydraulic working pressure in the pump drive; means for sensing a second parameter indicative of operation of the piston; and means for determining errors in the operation of the pump based upon the first parameter and the second parameter.
Claim 5
Dependent Claim
25 words
The sludge pump of claim 2, wherein the second parameter is a sludge delivery pressure of sludge pumped from the material cylinder by the piston.
Claim 6
Dependent Claim
157 words
A sludge pump system comprising: a material cylinder; piston movable in the material cylinder; a pump drive for driving the piston during working cycles which include a pumping stroke and a filling stroke; pump valve means for connecting the material cylinder to an outlet during the pumping stroke and for connecting the material cylinder to an inlet during the filling stroke; means for monitoring operation of the sludge pump, the means for monitoring comprising: means for sensing a first parameter related to operation of the pump drive; means for sensing a second parameter indicative of operation of the piston; and means for determining errors in the operation of the pump based upon the first parameter and the second parameter; and means for adjusting a width of opening of a throttle valve of the pump drive based upon a comparison of a time period between an opening and a closing of a pump valve to a predetermined value.
Claim 7
Dependent Claim
157 words
A sludge pump system comprising: a material cylinder; piston movable in the material cylinder; a pump drive for driving the piston during working cycles which include a pumping stroke and a filling stroke; pump valve means for connecting the material cylinder to an outlet during the pumping stroke and for connecting the material cylinder to an inlet during the filling stroke; means for monitoring operation of the sludge pump, the means for monitoring comprising: means for sensing a first parameter related to operation of the pump drive; means for sensing a second parameter indicative of operation of the piston; and means for determining errors in the operation of the pump based upon the first parameter and the second parameter; and means for adjusting a width of opening of a throttle valve of the pump drive based upon a comparison of a time period between an opening and a closing of a pump valve to a predetermined value.
Claim 8
Dependent Claim
204 words
A sludge pump system comprising: a material cylinder; piston movable in the material cylinder; a pump drive for driving the piston during working cycles which include a pumping stroke and a filling stroke; pump valve means for connecting the material cylinder to an outlet during the pumping stroke and for connecting the material cylinder to an inlet during the filling stroke; means for monitoring operation of the sludge pump, the means for monitoring comprising: means for sensing a first parameter related to Operation of the pump drive; means for sensing a second parameter indicative of operation of the piston; and means for determining errors in the operation of the pump based upon the first parameter and the second parameter; and means for determining an actual pumping rate of hydraulic fluid in the pump drive based upon the first parameter sensed; means for determining a theoretical pumping rate of hydraulic fluid in the pump drive based upon the second parameter sensed, the second parameter sensed being indicative of a number of piston pumping strokes; and means for determining a quantity of hydraulic fluid leakage from the hydrostatic pump drive based upon a comparison of the determined actual pumping rate and the determined theoretical pumping rate.
Claim 9
Dependent Claim
204 words
A sludge pump system comprising: a material cylinder; piston movable in the material cylinder; a pump drive for driving the piston during working cycles which include a pumping stroke and a filling stroke; pump valve means for connecting the material cylinder to an outlet during the pumping stroke and for connecting the material cylinder to an inlet during the filling stroke; means for monitoring operation of the sludge pump, the means for monitoring comprising: means for sensing a first parameter related to Operation of the pump drive; means for sensing a second parameter indicative of operation of the piston; and means for determining errors in the operation of the pump based upon the first parameter and the second parameter; and means for determining an actual pumping rate of hydraulic fluid in the pump drive based upon the first parameter sensed; means for determining a theoretical pumping rate of hydraulic fluid in the pump drive based upon the second parameter sensed, the second parameter sensed being indicative of a number of piston pumping strokes; and means for determining a quantity of hydraulic fluid leakage from the hydrostatic pump drive based upon a comparison of the determined actual pumping rate and the determined theoretical pumping rate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-13 | 1998-08-15 | 1999-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-13 | 2002-08-15 | 2003-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-13 | 2006-08-15 | 2007-02-14 | $7700.00 | Window Closed / Lapsed |