US4830218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow compensated pump
Assignee: FLUID MANAGEMENT SYSTEMS A MASSACHUSETTS CORP
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Filing: 1987-01-27
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Granted: 1989-05-16
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Expires: 2007-01-27
Abstract
Abstract A controlled fluid delivery system comprising a pump and electric drive apparatus which provides precise metering of the fluid, and includes an error correction apparatus by which the system errors may be compensated and calibrated to provide a precisely controlled fluid flow at a continuous speed or small quantities of the fluid by intermittent system operations. Furthermore, the apparatus is modular and may accommodate a variety of mechanical pumps. The controlled fluid delivery system communicates with other apparatus such as measurement devices and process control equipment through standard binary communication lines.
Inventors
- 👤 Hamid Shirkhan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:07
CPC Classifications
B; B67; B67D; B67D7/00; B67D7/06; B67D7/08; B67D7/085; B67D7/30; B67D7/302; B67D7/303; G; G05; G05D; G05D7/00; G05D7/06; G05D7/0617; G05D7/0629; G05D7/0688
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
132 words
A controlled fluid delivery system, comprising: a pump providing a predetermined delivery of fluid between an input and an output through connecting tubing; electric pump drive means connected to said pump to provide said predetermined delivery of fluid according to a control signal; control means providing said control signal according to a desired flow rate; and error correction means providing a correcting signal to said control means in response to said desired flow rate and a measured corresponding flow, including at least one of a tubing ID compensation factor and a calibration factor derived from pump calibration, wherein said control signal corresponds to a signal derived from the product of the input flow rate, a pump motor parameter and at least one of said tubing ID compensation factor and said calibration factor.
Claim 2
Dependent Claim
132 words
A controlled fluid delivery system, comprising: a pump providing a predetermined delivery of fluid between an input and an output through connecting tubing; electric pump drive means connected to said pump to provide said predetermined delivery of fluid according to a control signal; control means providing said control signal according to a desired flow rate; and error correction means providing a correcting signal to said control means in response to said desired flow rate and a measured corresponding flow, including at least one of a tubing ID compensation factor and a calibration factor derived from pump calibration, wherein said control signal corresponds to a signal derived from the product of the input flow rate, a pump motor parameter and at least one of said tubing ID compensation factor and said calibration factor.
Claim 3
Dependent Claim
33 words
The controlled fluid delivery system of claim 1, further including means to communicate with a process control system, wherein control of the controlled fluid delivery system is provided by the process control system.
Claim 4
Dependent Claim
32 words
The controlled fluid delivery system of claim 1, wherein said error correction means includes calibration means providing multiple calibration signals at corresponding calibration points and interpolated correction signals between said calibration points.
Claim 5
Dependent Claim
19 words
The controlled fluid delivery system of claim 1, wherein said electric pump drive means comprises a DC stepper motor.
Claim 6
Dependent Claim
30 words
The controlled fluid delivery system of claim 1, further including display means for providing a display of at least one of a system parameter request prompts and system parameter values.
Claim 7
Dependent Claim
16 words
The controlled fluid delivery system of claim 1, wherein said pump comprises an interchangeable pump head.
Claim 8
Dependent Claim
20 words
The controlled fluid delivery system of claim 6, wherein said pump comprises one of a peristaltic pump and piston pump.
Claim 9
Dependent Claim
28 words
The controlled fluid delivery system of claim 1, further including valve control means to provide a valve control signal for selecting a fluid path relative to said pump.
Claim 10
Dependent Claim
195 words
A controlled fluid delivery system, comprising: a pump providing a predetermined delivery of fluid between an input and an output through connecting tubing: electric pump drive means connected to said pump to provide said predetermined delivery of fluid according to a control signal; control means providing said control signal according to a desired flow rate; and error correction means providing a correcting signal to said control means in response to said desired flow rate and a measured corresponding flow, including at least one of a tubing ID compensation factor and a calibration factor derived from pump calibration; and means to communicate with a process control system, wherein control of the controlled fluid delivery system is provided by the process control system, wherein said control signal corresponds to a signal derived from the product of the input flow rate, a pump motor parameter and at least one of said tubing ID compensation factor and said calibration factor, and wherein the operator manually enters calibration data into said controlled fluid delivery system, and said calibration compensation factor is calculated by said error correction means, wherein said calibration data comprises specific numeric values related to at least one.
Claim 11
Dependent Claim
195 words
A controlled fluid delivery system, comprising: a pump providing a predetermined delivery of fluid between an input and an output through connecting tubing: electric pump drive means connected to said pump to provide said predetermined delivery of fluid according to a control signal; control means providing said control signal according to a desired flow rate; and error correction means providing a correcting signal to said control means in response to said desired flow rate and a measured corresponding flow, including at least one of a tubing ID compensation factor and a calibration factor derived from pump calibration; and means to communicate with a process control system, wherein control of the controlled fluid delivery system is provided by the process control system, wherein said control signal corresponds to a signal derived from the product of the input flow rate, a pump motor parameter and at least one of said tubing ID compensation factor and said calibration factor, and wherein the operator manually enters calibration data into said controlled fluid delivery system, and said calibration compensation factor is calculated by said error correction means, wherein said calibration data comprises specific numeric values related to at least one.
Claim 12
Dependent Claim
201 words
A controlled fluid delivery system comprising: a pump providing a predetermined delivery of fluid between an input and an output through connecting tubing; electric pump drive means connected to said pump to provide said predetermined delivery of fluid according to a control signal; control means providing said control signal according to a desired flow rate; and error correction means providing a correcting signal to said control means in response to said desired flow rate and a measured corresponding flow, including at least one of a tubing ID compensation factor and a calibration factor derived from pump calibration; and means to communicate with a process control system, wherein control of the controlled fluid delivery system is provided by the process control system, wherein said control signal corresponds to a signal derived from the product of the input flow rate, a pump motor parameter and at least one of said tubing ID compensation factor and said calibration factor, and wherein said error correction means includes means for communicating to measuring devices including at least one of a balance scale and a volumetric measuring device, wherein said error correction means automatically calculates said calibration factor in response to signals provided by the measuring devices.
Claim 13
Dependent Claim
201 words
A controlled fluid delivery system comprising: a pump providing a predetermined delivery of fluid between an input and an output through connecting tubing; electric pump drive means connected to said pump to provide said predetermined delivery of fluid according to a control signal; control means providing said control signal according to a desired flow rate; and error correction means providing a correcting signal to said control means in response to said desired flow rate and a measured corresponding flow, including at least one of a tubing ID compensation factor and a calibration factor derived from pump calibration; and means to communicate with a process control system, wherein control of the controlled fluid delivery system is provided by the process control system, wherein said control signal corresponds to a signal derived from the product of the input flow rate, a pump motor parameter and at least one of said tubing ID compensation factor and said calibration factor, and wherein said error correction means includes means for communicating to measuring devices including at least one of a balance scale and a volumetric measuring device, wherein said error correction means automatically calculates said calibration factor in response to signals provided by the measuring devices.
Claim 14
Dependent Claim
138 words
A controlled fluid delivery system, comprising; a pump providing a predetermined delivery of fluid between an input and an output through connecting tubing; electric pump drive means connected to said pump to provide said predetermined delivery of fluid according to a control signal; control means providing said control signal according to a desired flow rate; and error correction means providing a correcting signal to said control means in response to said desired flow rate and a measured corresponding flow, including compensation for the impedance characteristics of said electric pump drive means, wherein said impedance characteristic is approximated by a piecewise linear curve of the pump drive means impedance characteristic versus drive frequency, and wherein said control means includes drive current control means to adjust the drive current of said electric pump drive means according to said impedance characteristic.
Claim 15
Dependent Claim
138 words
A controlled fluid delivery system, comprising; a pump providing a predetermined delivery of fluid between an input and an output through connecting tubing; electric pump drive means connected to said pump to provide said predetermined delivery of fluid according to a control signal; control means providing said control signal according to a desired flow rate; and error correction means providing a correcting signal to said control means in response to said desired flow rate and a measured corresponding flow, including compensation for the impedance characteristics of said electric pump drive means, wherein said impedance characteristic is approximated by a piecewise linear curve of the pump drive means impedance characteristic versus drive frequency, and wherein said control means includes drive current control means to adjust the drive current of said electric pump drive means according to said impedance characteristic.
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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |