Patent US3619675A successfully refreshed from Google Patents.
US3619675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control rod drive mechanism
Assignee: BFM ENERGY PRODUCTS CORP OF DE A DE CORP
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Filing: 1969-06-16
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Granted: 1971-11-09
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Expires: 1989-06-16
Abstract
Abstract A control rod drive mechanism for positioning a control rod in a nuclear reactor. The control rod having a part length poison portion for positioning in the reactor core. The mechanism coacting with a pressure housing and including an energizable stator mounted on the outside of the pressure housing and a rotor responsive to the stator mounted on the inside of the pressure housing for positioning a control rod. A rotor tube is movably mounted with a translating leadscrew and positioned within the rotor to be rotatably responsive to the magnetic field coupled thereto from the stator. The part length control rod is connected to the leadscrew and movable therewith. The rotor carries a nut assembly for engagement with the leadscrew to cause the leadscrew to be responsive to the rotations of the rotor and thereby the positioning of the control rod. The rotor is constructed of two pivoted segments adapted to pivot in opposite directions in response to the energization and deenergization of the stator for providing an unlocking and locking action of the rotor by moving one of the segments against the pressure housing to effect the braking action of the rotor and effective for preventing translation of the leadscrew.
Inventors
- 👤 Silveus M Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:08
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2247; F16H25/2266; G; G21; G21C; G21C7/00; G21C7/06; G21C7/08; G21C7/12; G21C7/14; H; H02; H02K; H02K7/00; H02K7/06; H02K7/065; H02K7/10; H02K7/12; H02K7/125; H02K99/00; H02K99/20; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
In a reactor control rod drive including a pressure housing, a motor stator assembly adapted for producing a rotating magnetic field surrounding the pressure housing, a rotor-nut assembly mounted within the pressure housing, a rotor tube rotatably mounted within the rotor assembly, a translating leadscrew mounted within the rotor tube to be responsive to the rotations of the rotor-nut assembly, a control rod connected to the leadscrew and moved therewith, the improvement comprising a rotor-nut assembly having segments adapted to pivot in opposite directions in response to the energization and deenergization of the stator assembly for providing an unlocking and locking action respectively of the rotor and effective for preventing translation of the leadscrew
Claim 2
Dependent Claim
114 words
In a reactor control rod drive including a pressure housing, a motor stator assembly adapted for producing a rotating magnetic field surrounding the pressure housing, a rotor-nut assembly mounted within the pressure housing, a rotor tube rotatably mounted within the rotor assembly, a translating leadscrew mounted within the rotor tube to be responsive to the rotations of the rotor-nut assembly, a control rod connected to the leadscrew and moved therewith, the improvement comprising a rotor-nut assembly having segments adapted to pivot in opposite directions in response to the energization and deenergization of the stator assembly for providing an unlocking and locking action respectively of the rotor and effective for preventing translation of the leadscrew
Claim 3
Dependent Claim
33 words
In a reactor control rod drive as defined in claim 1 including resilient means mounted with one of the rotor segments for moving said segment against said housing to effect the braking action.
Claim 4
Dependent Claim
160 words
In a nuclear reactor control rod drive mechanism connectable to a control rod having a pressure housing having a magnetic section, a motor having an energizable stator and a rotor, the stator being adapted for producing a rotating magnetic field and being mounted adjacent the magnetic section of the housing for coupling the magnetic field therethrough, a rotatable rotor tube positioned within the rotor, the rotor for the motor being mounted inside the pressure housing and rotatably mounted with the rotor tube to be rotatably responsive therewith to the magnetic field coupled thereto, and a translating leadscrew movably mounted within the rotor tube, said rotor carrying a nut assembly for engagement with the leadscrew to cause the leadscrew to be responsive to the rotations of the rotor, the improvement comprising the motor rotor carrying braking means normally braking the rotor when the motor stator is deenergized for holding the translating leadscrew in position and deactuated when the stator is energized.
Claim 5
Dependent Claim
160 words
In a nuclear reactor control rod drive mechanism connectable to a control rod having a pressure housing having a magnetic section, a motor having an energizable stator and a rotor, the stator being adapted for producing a rotating magnetic field and being mounted adjacent the magnetic section of the housing for coupling the magnetic field therethrough, a rotatable rotor tube positioned within the rotor, the rotor for the motor being mounted inside the pressure housing and rotatably mounted with the rotor tube to be rotatably responsive therewith to the magnetic field coupled thereto, and a translating leadscrew movably mounted within the rotor tube, said rotor carrying a nut assembly for engagement with the leadscrew to cause the leadscrew to be responsive to the rotations of the rotor, the improvement comprising the motor rotor carrying braking means normally braking the rotor when the motor stator is deenergized for holding the translating leadscrew in position and deactuated when the stator is energized.
Claim 6
Dependent Claim
47 words
In a nuclear reactor control rod drive mechanism as defined in claim 3 wherein the motor rotor comprises two pivoted segments adapted for pivoting in opposite directions in response to the energization and deenergization of the stator, said braking means being carried by one of said segments.
Claim 7
Dependent Claim
52 words
In a nuclear reactor control rod drive mechanism as defined in claim 4 wherein said rotor segments comprise a magnetic seGment coupled to the rotating magnetic field and the other segment carrying the braking means, said braking means being constructed and defined to be normally biased in braking position against said housing.
Claim 8
Dependent Claim
62 words
In a nuclear reactor control rod drive mechanism as defined in claim 3 wherein said nut assembly comprises a plurality of spaced-apart roller nuts which coact with the improvement to positively engage the leadscrew for holding and maintaining the leadscrew position and thereby the position of the control rod in the event of power interruption or failure of power to the stator.
Claim 9
Dependent Claim
125 words
In a nuclear reactor control rod drive mechanism for positioning a control rod having a part length poison portion including a pressure housing, a control rod drive mechanism including a drive motor having an energizable stator mounted on the outside of the pressure housing and a rotor responsive to the stator mounted on the inside of the pressure housing for positioning a control rod, the improvement comprising a motor rotor constructed and defined to be pivotable so that the ends of the rotor are swingable in opposite directions in response to the energization and deenergization of the motor stator, said rotor including means for holding the position of the drive mechanism upon deenergization of the stator in response to the swinging action of the rotor.
Claim 10
Dependent Claim
125 words
In a nuclear reactor control rod drive mechanism for positioning a control rod having a part length poison portion including a pressure housing, a control rod drive mechanism including a drive motor having an energizable stator mounted on the outside of the pressure housing and a rotor responsive to the stator mounted on the inside of the pressure housing for positioning a control rod, the improvement comprising a motor rotor constructed and defined to be pivotable so that the ends of the rotor are swingable in opposite directions in response to the energization and deenergization of the motor stator, said rotor including means for holding the position of the drive mechanism upon deenergization of the stator in response to the swinging action of the rotor.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |