US4424571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating compressor analog
Assignee: SOUTHERN GAS ASSOCIATION PIPELINE AND COMPRESSOR RESEARCH COUNCIL
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Filing: 1981-06-29
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Granted: 1984-01-03
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Expires: 2001-06-29
Abstract
Abstract An apparatus for electrically simulating a reciprocating gas pump or compressor includes unidirectional devices for simulating intake and discharge valves. The volume of the reciprocating cylinder is modeled by a fixed capacitor coupled in a feedback arrangement with a variable gain amplifier. The gain of the amplifier is preferably controlled by the contents of a digital memory device, which varies the gain to simulate the pumping action of a compressor. The device provides voltage outputs representing the pressure and volume readings obtained in the compressor being simulated.
Inventors
- 👤 Carl E. Edlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:06
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/48; G06G7/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
An apparatus for electrically simulating a reciprocating fluid compressor, comprising: means for simulating a compressor intake valve; means for simulating a compressor discharge valve, wherein said discharge valve simulating means is coupled to said intake valve simulating means at a common point; a high impedance buffer amplifier having an input coupled to the common point and an output; a first memory; a multiplier coupled to the buffer amplifier output and a first memory output, wherein said multiplier has an output proportional to the product of the buffer amplifier output and the first memory output; a capacitor coupled to the output of said multiplier and to the input of said buffer amplifier in a feed back arrangement; a second memory; means coupled to said first and second memories for sequentially addressing their contents; means coupled to said second memory for converting an output to an analog signal proportional to the volume of the reciprocating compressor; and an output line coupled to the output of said buffer amplifier, wherein the voltage present on said output line is proportional to the fluid pressure in the compressor.
Claim 2
Independent Claim
183 words
An apparatus for electrically simulating a reciprocating fluid compressor, comprising: means for simulating a compressor intake valve; means for simulating a compressor discharge valve, wherein said discharge valve simulating means is coupled to said intake valve simulating means at a common point; a high impedance buffer amplifier having an input coupled to the common point and an output; a first memory; a multiplier coupled to the buffer amplifier output and a first memory output, wherein said multiplier has an output proportional to the product of the buffer amplifier output and the first memory output; a capacitor coupled to the output of said multiplier and to the input of said buffer amplifier in a feed back arrangement; a second memory; means coupled to said first and second memories for sequentially addressing their contents; means coupled to said second memory for converting an output to an analog signal proportional to the volume of the reciprocating compressor; and an output line coupled to the output of said buffer amplifier, wherein the voltage present on said output line is proportional to the fluid pressure in the compressor.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1, wherein said valve simulating means comprises two diodes.
Claim 4
Independent Claim
128 words
An apparatus for electrically simulating a reciprocating fluid compressor, comprising: means for simulating an intake valve; means for simulating a discharge valve, wherein said discharge valve simulating means is coupled to said intake valve simulating means at a common point; a controllable gain amplifier having an input coupled to the common point; a capacitor coupled to an output and the input of said amplifier in a feedback arrangement; a first memory; means contained within said amplifier for multiplying an output signal from said first memory with a voltage proportional to the voltage present at the input of said amplifier; a second memory; a digital to analog converter coupled to the output of said second memory; and means for sequentially addressing the contents of said first and second memories.
Claim 5
Independent Claim
128 words
An apparatus for electrically simulating a reciprocating fluid compressor, comprising: means for simulating an intake valve; means for simulating a discharge valve, wherein said discharge valve simulating means is coupled to said intake valve simulating means at a common point; a controllable gain amplifier having an input coupled to the common point; a capacitor coupled to an output and the input of said amplifier in a feedback arrangement; a first memory; means contained within said amplifier for multiplying an output signal from said first memory with a voltage proportional to the voltage present at the input of said amplifier; a second memory; a digital to analog converter coupled to the output of said second memory; and means for sequentially addressing the contents of said first and second memories.
References Cited (Backward Citations)
US2951638A
Cited
US2936041A
Cited
US2979940A
Cited
US2997124A
Cited
US3506819A
Cited
US3970832A
Cited
SU412611A1
Cited
SU476573A1
Cited
US4079334A
Cited
SU577544A1
Cited
SU640326A1
Cited
US4215420A
Cited
SU802691A2
Cited
US4360787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |