US4762467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controlling the pressure ratio of a jet pump
Assignee: Henkel AG and Co KGaA
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Filing: 1986-12-19
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Granted: 1988-08-09
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Expires: 2006-12-19
Abstract
Abstract In a jet pump, the suction pressure (Po) generated may be kept constant within predetermined limits and times by varying the pressure ratio f(p) providing a prescribed value for the pressure ratio f(p) is determined by computer-aided iterative changing of an existing value of the pressure ratio f(p) using an algorithm and a measured value for the pressure (Pe) of the delivery fluid.
Inventors
- 👤 Hans Ackermann
- 👤 Ralf Koecher
- 👤 Udo Steinberner
- 👤 Otto Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:05
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/44; F04F5/48; F04F5/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
219 words
A method for controlling the pressure ratio of a jet pump to regulate a predetermined operating vacuum, said pressure ratio being defined as for a predetermined suction pressure and a predetermined volume of delivery fluid, the necessary volume of motive fluid is dependent on a function of the motive fluid pressure and the pressure at the exit of said jet pump, wherein a desired value for said pressure ratio is determined from the continuously measured value of the operating vacuum determined from the suction pressure in a vacuum container by a computer-aided iterative stepwise changing of an existing value of said pressure ratio, said iterative stepwise changing of an existing value of said pressure ratio being effected by use of an algorithm wherein the desired value is obtained by indefinitely repeating the algorithm using a corresponding computer, adapting the rate of change of the desired value for said pressure ratio to the magnitude and rate of change of the desired value/actual value deviation of the operating vacuum within preselectable limits, said algorithm having difference processing branches for different ranges of said desired value/actual value deviation of said operating vacuum and its rate of change, and observing a waiting time corresponding to the dead time of the system after each stepwise change of the desired value for said pressure ratio.
Claim 2
Independent Claim
219 words
A method for controlling the pressure ratio of a jet pump to regulate a predetermined operating vacuum, said pressure ratio being defined as for a predetermined suction pressure and a predetermined volume of delivery fluid, the necessary volume of motive fluid is dependent on a function of the motive fluid pressure and the pressure at the exit of said jet pump, wherein a desired value for said pressure ratio is determined from the continuously measured value of the operating vacuum determined from the suction pressure in a vacuum container by a computer-aided iterative stepwise changing of an existing value of said pressure ratio, said iterative stepwise changing of an existing value of said pressure ratio being effected by use of an algorithm wherein the desired value is obtained by indefinitely repeating the algorithm using a corresponding computer, adapting the rate of change of the desired value for said pressure ratio to the magnitude and rate of change of the desired value/actual value deviation of the operating vacuum within preselectable limits, said algorithm having difference processing branches for different ranges of said desired value/actual value deviation of said operating vacuum and its rate of change, and observing a waiting time corresponding to the dead time of the system after each stepwise change of the desired value for said pressure ratio.
Claim 3
Dependent Claim
39 words
A method as in claim 1, wherein the desired value for said pressure ratio is fed in the form of a manipulated variable for the motive fluid pressure to a regulating valve in the pipe for the motive fluid.
Claim 4
Dependent Claim
35 words
A method as in claim 1, wherein the desired value for said pressure ratio is used as a command quantity for the motive fluid pressure and/or the output pressure in an associated automatic control system.
Claim 5
Independent Claim
193 words
A method for controlling the pressure ratio of a jet pump to regulate a predetermined operating vacuum; said pressure ratio being a function of the motive fluid pressure, the pressure at the exit of said jet pump and the suction pressure in a vacuum container; wherein a desired value for said pressure ratio is determined from the continuously measured value of said suction pressure by computer-aided iterative stepwise changing of an existing value of said pressure ratio, effecting said iterative stepwise changing of an existing value of said pressure ratio by the use of an algorithm wherein the desired value is obtained by indefinitely repeating the algorithm using a corresponding computer, adapting the rate of change of the desired value for said pressure ratio to the magnitude and rate of change of the desired value/actual value deviation of the operating vacuum within preselectable limits, said algorithm having different processing branches for different ranges of said desired value/actual value deviation of said operating vacuum and its rate of change, and observing a waiting time corresponding to the dead time of the system after each stepwise change of the desired value for said pressure ratio.
Claim 6
Independent Claim
193 words
A method for controlling the pressure ratio of a jet pump to regulate a predetermined operating vacuum; said pressure ratio being a function of the motive fluid pressure, the pressure at the exit of said jet pump and the suction pressure in a vacuum container; wherein a desired value for said pressure ratio is determined from the continuously measured value of said suction pressure by computer-aided iterative stepwise changing of an existing value of said pressure ratio, effecting said iterative stepwise changing of an existing value of said pressure ratio by the use of an algorithm wherein the desired value is obtained by indefinitely repeating the algorithm using a corresponding computer, adapting the rate of change of the desired value for said pressure ratio to the magnitude and rate of change of the desired value/actual value deviation of the operating vacuum within preselectable limits, said algorithm having different processing branches for different ranges of said desired value/actual value deviation of said operating vacuum and its rate of change, and observing a waiting time corresponding to the dead time of the system after each stepwise change of the desired value for said pressure ratio.
Claim 7
Dependent Claim
39 words
A method as in claim 4 wherein said actual value of said operating vacuum is measured, processed by a computer-aided algorithm to an output quantity, and used in that form as a manipulated variable for said motive fluid pressure.
Claim 8
Dependent Claim
26 words
A method as in claim 5 wherein said motive fluid pressure represents the volume of motive fluid fed to said jet pump per unit of time.
Claim 9
Dependent Claim
39 words
A method as in claim 5 wherein said desired value for said pressure ratio is fed in the form of a manipulated variable for said motive fluid pressure to a regulating valve in the pipe for said motive fluid.
Claim 10
Dependent Claim
37 words
A method as in claim 5 wherein said desired value for said pressure ratio is fed in the form of a command variable for said motive fluid pressure and/or output pressure to an associated automatic control system.
References Cited (Backward Citations)
US2140306A
Cited
GB934502A
Cited
US3456871A
Cited
DE1703040A1
Cited
JPS5587900A
Cited
US4332527A
Cited
JPS5779300A
Cited
JPS5835299A
Cited
JPS6081500A
Cited
JPS6098200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |