US4220910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Raising-pressure delay type electromagnetic pumps
Assignee: Taisan Industrial Co Ltd
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Filing: 1977-12-30
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Granted: 1980-09-02
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Expires: 1997-12-30
Abstract
Abstract An electromagnetic pump in which the ignition sound at the time of starting of a combustor is lowered by delaying a raising speed for the delivery pressure of fuel oil. The delivery pressure of fuel oil is automatically controlled by means of an electronic delay circuit including a silicon controlled rectifier which is phase controlled in synchronism with a power source, a trigger diode, and resistors and condensers used for setting the amount of time delay.
Inventors
- 👤 Yasutsune Chiba
- 👤 Shizuo Arima
- 👤 Shoji Suzuki
- 👤 Masayuki Saitoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:51
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
An electromagnetic pump arranged to be driven by rectified half-wave currents from a power source, comprising: a power source; a pump coil connected in series with said power source; a silicon controlled rectifier connected in series with said pump coil; a trigger diode connected to the gate of said silicon controlled rectifier; an R-C phase control circuit connected between the anode and the cathode of said silicon controlled rectifier for controlling the firing point thereof in association with said trigger diode; a resistor and condenser connected across the power source in series relationship to each other; and a diode means connected to the junction of said resistor and said condenser in the polarity under which current flows into said R-C phase control circuit such that the base potential of said R-C phase control circuit is raised stepwise as half-wave currents are generated from said power source.
Claim 2
Dependent Claim
146 words
An electromagnetic pump arranged to be driven by rectified half-wave currents from a power source, comprising: a power source; a pump coil connected in series with said power source; a silicon controlled rectifier connected in series with said pump coil; a trigger diode connected to the gate of said silicon controlled rectifier; an R-C phase control circuit connected between the anode and the cathode of said silicon controlled rectifier for controlling the firing point thereof in association with said trigger diode; a resistor and condenser connected across the power source in series relationship to each other; and a diode means connected to the junction of said resistor and said condenser in the polarity under which current flows into said R-C phase control circuit such that the base potential of said R-C phase control circuit is raised stepwise as half-wave currents are generated from said power source.
Claim 3
Dependent Claim
145 words
An electromagnetic pump of the type to be driven by rectified half-wave currents and whose delivery pressure of fuel oil at the time of starting thereof is progressively raised, comprising: a pump coil; a silicon controlled rectifier connected in series with said pump coil; a triggering circuit connected to the gate of said silicon controlled rectifier through a trigger diode for phase-controlling said silicon controlled rectifier in synchronism with the rectified half-wave currents of a power source; and a control circuit associated with said triggering circuit for gradually reducing a phase angle determined by circuit constants of said triggering circuit from the instant power is applied thereto, said control circuit including a resistor and a condenser connected in series with each other and a diode means connected to the junction of said resistor and said condenser in the polarity under which currents flow out therefrom.
Claim 4
Dependent Claim
145 words
An electromagnetic pump of the type to be driven by rectified half-wave currents and whose delivery pressure of fuel oil at the time of starting thereof is progressively raised, comprising: a pump coil; a silicon controlled rectifier connected in series with said pump coil; a triggering circuit connected to the gate of said silicon controlled rectifier through a trigger diode for phase-controlling said silicon controlled rectifier in synchronism with the rectified half-wave currents of a power source; and a control circuit associated with said triggering circuit for gradually reducing a phase angle determined by circuit constants of said triggering circuit from the instant power is applied thereto, said control circuit including a resistor and a condenser connected in series with each other and a diode means connected to the junction of said resistor and said condenser in the polarity under which currents flow out therefrom.
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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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |