Patent US3262394A successfully refreshed from Google Patents.
US3262394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler feed pump control system
Assignee: Ingersoll Rand Co
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Filing: 1964-08-19
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Granted: 1966-07-26
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Expires: 1984-08-19
Abstract
No abstract record available.
Inventors
- 👤 Smith John Pearson
- 👤 Samuel A Carswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:38
CPC Classifications
F; F22; F22D; F22D5/00; F22D5/04; F22D11/00; F22D11/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A METHOD OF PREVENTING THE VAPORIZATION OF WATER IN A BALANCING DRUM CHAMBER OF A BOILER FEED PUMP COMPRISING THE STEPS OF: (A) SENSING THE TEMPERATURE AND PRESSURE OF THE WATER IN THE BALANCING DRUM CHAMBER OF THE BOILER FEED PUMP, (B) TRANSMITTING A SIGNAL COMMENSURATE WITH THE TEMPERATURE AND PRESSURE SENSED TO A COMPUTING DEVICE, (C) CORRELATING THE TEMPERATURE AND PRESSURE SIGNALS INTO A RESULTANT SIGNAL IN ACCORDANCE WITH THE FORMULA P1=P2-K1P3 WHEREIN: P1 REPERESENTS THE RESULTANT OR COMPUTED SIGNAL P2 REPRESENTS THE TEMPERATURE SIGNAL P3 REPRESENTS THE PRESSURE SIGNAL, AND K1 REPRESENTS A CONSTANT FACTOR WHICH IS A LINEARIZED "SLOPE" OF VAPOR PRESSURE RELATIVE TO A TEMPERATURE CURVE, (D) RECIRCULATING THE FLUID DISCHARGED FROM THE PUMP WHEN THE VALUE OF P1 REACHES A PREDETERMINED VALUE NEAR THE POINT AT WHICH THE WATER IN THE BALANCING DRUM CHAMBER WILL VAPORIZE UNDER THE EXISTING PRESSURE THEREIN.
Claim 2
Independent Claim
146 words
A METHOD OF PREVENTING THE VAPORIZATION OF WATER IN A BALANCING DRUM CHAMBER OF A BOILER FEED PUMP COMPRISING THE STEPS OF: (A) SENSING THE TEMPERATURE AND PRESSURE OF THE WATER IN THE BALANCING DRUM CHAMBER OF THE BOILER FEED PUMP, (B) TRANSMITTING A SIGNAL COMMENSURATE WITH THE TEMPERATURE AND PRESSURE SENSED TO A COMPUTING DEVICE, (C) CORRELATING THE TEMPERATURE AND PRESSURE SIGNALS INTO A RESULTANT SIGNAL IN ACCORDANCE WITH THE FORMULA P1=P2-K1P3 WHEREIN: P1 REPERESENTS THE RESULTANT OR COMPUTED SIGNAL P2 REPRESENTS THE TEMPERATURE SIGNAL P3 REPRESENTS THE PRESSURE SIGNAL, AND K1 REPRESENTS A CONSTANT FACTOR WHICH IS A LINEARIZED "SLOPE" OF VAPOR PRESSURE RELATIVE TO A TEMPERATURE CURVE, (D) RECIRCULATING THE FLUID DISCHARGED FROM THE PUMP WHEN THE VALUE OF P1 REACHES A PREDETERMINED VALUE NEAR THE POINT AT WHICH THE WATER IN THE BALANCING DRUM CHAMBER WILL VAPORIZE UNDER THE EXISTING PRESSURE THEREIN.
Claim 3
Dependent Claim
289 words
A CONTROL SYSTEM IN COMBINATION WITH A BOILER FEED PUMP HAVING A BALANCING DRUM AND A BALANCING DRUM CHAMBER THEREIN FOR RECEIVING THE WATER AT SUBSTANTIALLY INLET WATER TEMPERATURE AND PRESSURE, THE CONTROL SYSTEM COMPRISING: (A) A COMPUTING DEVICE, (B) A FIRST TEMPERATURE SENSING AND TRANSMITTING MEANS FOR MEASURING THE TEMPERATURE OF WATER IN THE BALANCING DRUM CHAMBER AND TRANSMITTING A SIGNAL COMMENSURATE WITH THE TEMPERATURE MEASUREMENT TO SAID COMPUTING DEVICE, (C) PRESSURE SENSING AND TRANSMITTING MEANS FOR MEASURING THE PRESSURE OF THE WATER IN THE BALANCING DRUM CHAMBER AND TRANSMITTING A SIGNAL COMMENSURATE WITH THE PRESSURE MEASUREMENT TO SAID COMPUTING DEVICE, (D) SAID COMPUTING DEVICE BEING CONSTRUCTED AND ARRANGED TO CALCULATE THE RELATIONSHIP OF THE TEMPERATURE AND PRESSURE AS CONVEYED BY SAID TEMPERATURE AND PRESSURE SIGNALS AND TRANSMITTING A RESULTANT SIGNAL, (E) A RECIRCULATION LINE COMMUNICATING WITH THE DISCHARGE OF THE BOILER FEED PUMP, (F) A BY-PASS VALVE IN SAID RECIRCULATION LINE, (G) OPERATING MEANS CONNECTED TO SAID COMPUTING DEVICE AND SAID BY-PASS VALVE FOR OPENING THE BY-PASS VALVE AT A PREDETERMINED RESULTANT SIGNAL AND FOR CLOSING THE BY-PASS VALVE AT ANOTHER PREDETERMINED RESULTANT SIGNAL, AND A SECOND TEMPERATURE SENSING AND TRANSMITTING MEANS FOR MEASURING THE TEMPERATURE OF THE WATER ENTERING THE BOILER FEED PUMP AND TRANSMITTING A SIGNAL, A SECOND COMPUTING DEVICE CONNECTED TO SAID FIRSTMENTIONED TEMPERATURE SENSING AND TRANSMITTING MEANS AND SAID SECOND TEMPERATURE SENSING AND TRANSMITTING MEANS TO RECEIVE THE TEMPERATURE SIGNALS THEREFROM AND COMPUTE THE TEMPERATURE DIFFERENTIAL BETWEEN THE WATER ENTERING SAID FEED PUMP AND THE WATER IN THE BALANCING DRUM CHAMBER, AND SECOND OPERATING MEANS OVERRIDING SAID FIRST-MENTIONED OPERATING MEANS TO OPEN SAID BY-PASS VALVE UPON A PREDETERMINED MAXIMUM TEMPERATURE DIFFERENTIAL AND TO CLOSE SAID BY-PASS VALVE UPON A PREDETERMINED MINIMUM TEMPERATURE DIFFERENTIAL.
Claim 4
Dependent Claim
289 words
A CONTROL SYSTEM IN COMBINATION WITH A BOILER FEED PUMP HAVING A BALANCING DRUM AND A BALANCING DRUM CHAMBER THEREIN FOR RECEIVING THE WATER AT SUBSTANTIALLY INLET WATER TEMPERATURE AND PRESSURE, THE CONTROL SYSTEM COMPRISING: (A) A COMPUTING DEVICE, (B) A FIRST TEMPERATURE SENSING AND TRANSMITTING MEANS FOR MEASURING THE TEMPERATURE OF WATER IN THE BALANCING DRUM CHAMBER AND TRANSMITTING A SIGNAL COMMENSURATE WITH THE TEMPERATURE MEASUREMENT TO SAID COMPUTING DEVICE, (C) PRESSURE SENSING AND TRANSMITTING MEANS FOR MEASURING THE PRESSURE OF THE WATER IN THE BALANCING DRUM CHAMBER AND TRANSMITTING A SIGNAL COMMENSURATE WITH THE PRESSURE MEASUREMENT TO SAID COMPUTING DEVICE, (D) SAID COMPUTING DEVICE BEING CONSTRUCTED AND ARRANGED TO CALCULATE THE RELATIONSHIP OF THE TEMPERATURE AND PRESSURE AS CONVEYED BY SAID TEMPERATURE AND PRESSURE SIGNALS AND TRANSMITTING A RESULTANT SIGNAL, (E) A RECIRCULATION LINE COMMUNICATING WITH THE DISCHARGE OF THE BOILER FEED PUMP, (F) A BY-PASS VALVE IN SAID RECIRCULATION LINE, (G) OPERATING MEANS CONNECTED TO SAID COMPUTING DEVICE AND SAID BY-PASS VALVE FOR OPENING THE BY-PASS VALVE AT A PREDETERMINED RESULTANT SIGNAL AND FOR CLOSING THE BY-PASS VALVE AT ANOTHER PREDETERMINED RESULTANT SIGNAL, AND A SECOND TEMPERATURE SENSING AND TRANSMITTING MEANS FOR MEASURING THE TEMPERATURE OF THE WATER ENTERING THE BOILER FEED PUMP AND TRANSMITTING A SIGNAL, A SECOND COMPUTING DEVICE CONNECTED TO SAID FIRSTMENTIONED TEMPERATURE SENSING AND TRANSMITTING MEANS AND SAID SECOND TEMPERATURE SENSING AND TRANSMITTING MEANS TO RECEIVE THE TEMPERATURE SIGNALS THEREFROM AND COMPUTE THE TEMPERATURE DIFFERENTIAL BETWEEN THE WATER ENTERING SAID FEED PUMP AND THE WATER IN THE BALANCING DRUM CHAMBER, AND SECOND OPERATING MEANS OVERRIDING SAID FIRST-MENTIONED OPERATING MEANS TO OPEN SAID BY-PASS VALVE UPON A PREDETERMINED MAXIMUM TEMPERATURE DIFFERENTIAL AND TO CLOSE SAID BY-PASS VALVE UPON A PREDETERMINED MINIMUM TEMPERATURE DIFFERENTIAL.
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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) | 1969-07-25 | 1970-01-24 | 1970-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-25 | 1974-01-24 | 1974-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-25 | 1978-01-24 | 1978-07-26 | $7700.00 | Window Closed / Lapsed |