CN1182541C - Reactor control-rod driving mechanism with adjustable magnetic damper - Google Patents
Reactor control-rod driving mechanism with adjustable magnetic damper Download PDFInfo
- Publication number
- CN1182541C CN1182541C CNB021486379A CN02148637A CN1182541C CN 1182541 C CN1182541 C CN 1182541C CN B021486379 A CNB021486379 A CN B021486379A CN 02148637 A CN02148637 A CN 02148637A CN 1182541 C CN1182541 C CN 1182541C
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- driving mechanism
- magnetic damper
- disk
- control rod
- motor
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- 230000007246 mechanism Effects 0.000 title claims abstract description 55
- 230000009467 reduction Effects 0.000 claims abstract description 15
- 229910000679 solder Inorganic materials 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000013016 damping Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Vibration Prevention Devices (AREA)
Abstract
The present invention relates to a reactor control rod driving mechanism with an adjustable magnetic damper, which comprises a driving mechanism bracket, a driving chain, a rod position measuring system and a magnetic damper, wherein the driving chain is composed of a motor, a gear reduction mechanism and a chain wheel device; the magnetic damper is composed of a movable disc, an upper and a lower magnetic discs, and a bearing seat. The motor of the present invention adopts a biaxial extension stepping motor, the magnetic damper adopts an adjustable structure, and the magnetic damper is arranged in the outer top position of the driving mechanism bracket. Because the magnetic damper only performs the damping action, does not bear the driving function and adopts the adjustable structure, the driving chain of the control rod driving mechanism is short, and the driving is stable and reliable. Besides, the magnetic damper can not be limited by the driving mechanism bracket and can obtain enough braking moment under the condition of big gaps between the magnetic discs and the movable disc, and therefore, the influence of the falling speed of the rod by the manufacture and assembly precision of the control rod driving mechanism is reduced, and the phenomenon of scrape which can occur between the movable disc and the magnetic discs can be eliminated. The present invention provides the assurance for the safe operation in reactor disaster working conditions.
Description
Technical field
The present invention relates to a kind of driving arrangement of reactor control rod, relate in particular to a kind of control rod drive mechanisms (CRD) with magnetic damper.
Background technology
Under the reactor nominal situation, control rod drive mechanisms (CRD) moves in reactor with certain speed drive control rod, regulates the reactor core reactivity, realizes normal reactor start-up, power adjustments and shutdown; Under the reactor accident operating mode, the control rod drive mechanisms (CRD) outage, control rod inserts reactor core fast by deadweight, the sudden closure of realization response heap.Magnetic damper is wherein in order to the fall brake component of rod speed of limited reactions heap accident.
On the HTR-10 reactor of the HTTR reactor of the THTR of Germany reactor, Japan and Tsing-Hua University's design-build, all adopted at present the control rod drive mechanisms (CRD) of band magnetic damper.Generally all include parts such as motor, magnetic damper, gear reduction, chain gear apparatus, rod position measuring system and spring shock absorption mechanism in these driving mechanisms, each parts interconnects and locatees by the driving mechanism support.The driving-chain of existing control rod drive mechanisms (CRD) is generally: the rotation of motor reaches chain gear apparatus through magnetic damper, gear reduction, and chain gear apparatus is converted to rotation the rectilinear motion of control rod again.But find that in processing and manufacturing and operational process there is following problem in existing control rod drive mechanisms (CRD): 1. magnetic damper participates in transmission, makes that the driving-chain of whole driving mechanism is longer relatively, is unfavorable for its even running; 2. driving mechanism supporting structure complexity, difficult processing is to reach the design accuracy requirement; 3. magnetic damper is positioned at the driving mechanism internal stent, its radial dimension is restricted, in order to obtain enough braking moments, can only reduce the gap between Moving plate and disk as far as possible, make braking moment very responsive to this gap value, less manufacturing, rigging error all can cause the change of the bigger rod speed that falls, even Moving plate and disk generation " scratch " sometimes, form the card rod; 4. when the rod speed that falls is not inconsistent because of processing, rigging error and designing requirement, can't effectively regulate.
Summary of the invention
The purpose of this invention is to provide that a kind of driving-chain is short, supporting structure is simple and be easy to processing and manufacturing, the reliable and stable control rod drive mechanisms (CRD) of overall operation, magnetic damper Moving plate wherein and disk adjustable gaps, make control rod drive mechanisms (CRD) not only satisfy under the reactor nominal situation the reactive requirement of regulating, and provide more reliable means for the safe shutdown of reactor accident operating mode.
Technical scheme of the present invention is as follows: a kind of reactor control rod driving mechanism with adjustable magnetic damper, comprise the driving mechanism support, be arranged on this support by motor, gear reduction, the driving-chain that chain gear apparatus is formed, rod position measuring system, by Moving plate, have permanent magnet on, the magnetic damper that following disk and bearing seat are formed, it is characterized in that: described motor adopts twin shaft to stretch stepper motor, described upward disk and top chock are separated from each other, magnetic damper is connected with the last shaft extension of motor, the following shaft extension of motor links to each other with gear reduction, and is arranged in the outer tip position of driving mechanism support.
The last disk and the top chock of described magnetic damper are separated from each other and leave the gap, at the lock-screw that disk in the set screw that can regulate disk and Moving plate gap, the locking is housed on the top chock and be provided with the measured hole that can measure disk and Moving plate gap.
On the following disk of described magnetic damper bearing being housed uses as step; Described driving mechanism support adopts box integral solder structure.
The present invention compared with prior art, have the following advantages and the high-lighting effect: owing in the control rod drive mechanisms (CRD) of the present invention magnetic damper is designed to only rise the individual components of damping action, do not bear transmission agency, thereby make that the driving-chain of The whole control rod drive mechanism is shorter, the processing and manufacturing of driving mechanism support is more simple, and transmission is more steady reliable; Magnetic damper is adjustable structure, and the rod speed that falls can be regulated and control according to designing requirement, for the safe operation under the reactor accident operating mode provides assurance.Magnetic damper is not subjected to the restriction of driving arm in addition, can increase the radial dimension of magnetic damper as far as possible, promptly increases the magnetic patch sectional area and the damping arm of force significantly, thereby obtains enough braking moments under the bigger situation in disk and Moving plate gap.So both reduced control rod drive mechanisms (CRD) manufacturing, assembly precision influence, can eliminate Moving plate and disk contingent " scratch " phenomenon again the rod speed that falls.
Description of drawings
Fig. 1 is the reactor control rod driving mechanism structural representation of the adjustable magnetic damper of band of the present invention.
Fig. 2 is the structural representation of adjustable magnetic damper.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Reactor control rod driving mechanism with adjustable magnetic damper provided by the present invention partly is made up of adjustable magnetic damper 1, motor 2, gear reduction 3, chain gear apparatus 4, rod position measuring system 5 and driving mechanism support 6 etc.Adjustable magnetic damper 1 comprises: parts such as Moving plate 7, last disk 8, following disk 9, top chock 10, set screw 11, lock-screw 12 and magnetic patch 13.Magnetic damper 1 places the outer top of driving mechanism support 6, is linked to each other with motor 2 by axle sleeve 14.For the structure that makes magnetic damper is compact more, on the following disk 9 samarium-cobalt permanent-magnetic material Sm is housed not only
2(Co, Cu, Fe, Zr)
17The magnetic patch of making 13, but also bearing is housed as bearing seat; Mutual location between magnetic damper and driving mechanism support is realized by the seam 25 on the following disk.Last disk 8 is separated from each other with top chock 10, therefore goes up disk 8 and can move, to regulate the gap of 7 of itself and Moving plates.For guaranteeing the unimpeded of magnetic circuit, adopt transition fit between last disk 8 and the following disk 9.When adjusting the gap of disk 8 and Moving plate 7 by three set screw 11, the gap width that is recorded by three measured holes 26 must equate, to guarantee the parallel of disk 8 and Moving plate 7.Must will go up disk 8 with three lock-screws 13 after the gap adjustment is finished fixes.(DCS) controls and manages the operation of control rod drive mechanisms (CRD) for ease of digital control system, and the motor 2 in this driving mechanism is stretched the formula stepper motor for twin shaft, and shaft extension links to each other with magnetic damper 1 on it, and following shaft extension links to each other with gear reduction 3.For making the driving mechanism structure compactness and saving the space, gear reduction 3 adopts bevel gears 15 and spur gear 16 structure combining patterns.Chain gear apparatus 4 is used for promoting and inserting control rod, and this device is after taking to install chain guard 17 additional, leading measures such as carrier bar 18 and raising manufacturing accuracy, and it at the Shi Buhui that runs up chain 27 takes place and breaks away from the major accident that sprocket wheels 28 cause the card rod.Rod position measuring system 5 comprises selsyn 19 and worm gear-endless screw device 20, worm gear-endless screw device 20 links to each other with chain gear apparatus 4, the control rod stroke is converted to the anglec of rotation of worm gear, and selsyn 19 sends angle signal to the DCS system to carry out the rod position and handles and show.Driving mechanism support 6 is box integral solder structure, and it mainly is made up of damper back up pad 21, motor support plate 22, two gear reduction back up pads 23 and two chain gear apparatus back up pads 24.In the process of driving mechanism support 6, pilot hole on the damper back up pad 21 29 must satisfy the right alignment requirement with pilot hole 30 on the motor support plate 22, and is coaxial with gear reduction 3 threes to guarantee magnetic damper 1, motor 2; Dead eye 32 on dead eye 31 on two gear reduction back up pads 23 and the two chain gear apparatus back up pads 24 must satisfy depth of parallelism requirement, to guarantee the parallel axes of gear reduction and chain gear apparatus.
The present invention breaks away from the driving-chain of magnetic damper 1 with control rod drive mechanisms (CRD), become one independently brake component place the outer top of driving mechanism support 6, the rotation of motor 2 only reaches chain gear apparatus 4 through gear reduction 3, shortened the driving-chain of control rod drive mechanisms (CRD), made its operation more steady; Omitted two magnetic damper back up pads in the driving mechanism support 6, reduced its complex structure degree, so the present invention is designed to box integral solder structure with it,, reduce rigging error to guarantee machining accuracy; Because the independence of magnetic damper 1, its structure and size are not subjected to the restriction of driving mechanism support 6, therefore the present invention is designed to adjustable structure with it, promptly changes the size of braking moment by the gap between adjustment magnetic damper disk and the Moving plate, the rod speed thereby the adjustment accident falls; The present invention can not be subjected to the restriction of driving mechanism support 6 in addition, increases the radial dimension of magnetic damper 1 as far as possible, promptly increases magnetic patch 13 sectional areas and the damping arm of force significantly, thereby obtains enough braking moments under the bigger situation in disk and Moving plate gap.So both reduced control rod drive mechanisms (CRD) manufacturing, assembly precision influence, can eliminate Moving plate and disk contingent " scratch " phenomenon again the rod speed that falls.
Claims (4)
1. reactor control rod driving mechanism with adjustable magnetic damper, comprise the driving mechanism support, be arranged on this support by motor, gear reduction, the driving-chain that chain gear apparatus is formed, rod position measuring system, by Moving plate, have permanent magnet on, the magnetic damper that following disk and bearing seat are formed, it is characterized in that: described motor adopts twin shaft to stretch stepper motor, described upward disk and top chock are separated from each other, magnetic damper is connected with the last shaft extension of motor, the following shaft extension of motor links to each other with gear reduction, and is arranged in the outer tip position of driving mechanism support.
2. according to the described reactor control rod driving mechanism of claim 1, it is characterized in that: the last disk and the top chock of described magnetic damper are separated from each other and leave the gap, the lock-screw of disk and be provided with the measured hole of disk and Moving plate gap in the measurement in the set screw that disk and Moving plate gap in the adjusting are housed on the top chock, locking.
3. according to claim 1 or 2 described reactor control rod driving mechanisms, it is characterized in that: on the following disk of described magnetic damper bearing is housed and uses as step.
4. according to the described reactor control rod driving mechanism of claim 1, it is characterized in that: described driving mechanism support adopts box integral solder structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021486379A CN1182541C (en) | 2002-11-14 | 2002-11-14 | Reactor control-rod driving mechanism with adjustable magnetic damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021486379A CN1182541C (en) | 2002-11-14 | 2002-11-14 | Reactor control-rod driving mechanism with adjustable magnetic damper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1405788A CN1405788A (en) | 2003-03-26 |
| CN1182541C true CN1182541C (en) | 2004-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021486379A Expired - Fee Related CN1182541C (en) | 2002-11-14 | 2002-11-14 | Reactor control-rod driving mechanism with adjustable magnetic damper |
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| Country | Link |
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| CN (1) | CN1182541C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10032529B2 (en) * | 2010-12-09 | 2018-07-24 | Westinghouse Electric Company Llc | Nuclear reactor internal electric control rod drive mechanism assembly |
| CN102280146B (en) * | 2011-06-28 | 2014-05-07 | 清华大学 | Mixed retarder for high-temperature gas-cooled reactor accidental scramming |
| CN103065692B (en) * | 2013-01-18 | 2015-04-22 | 中国科学院合肥物质科学研究院 | Safety rod driving system of liquid heavy metal cooling reactor |
| US9865364B2 (en) * | 2013-03-15 | 2018-01-09 | Bwxt Mpower, Inc. | CRDM with separate SCRAM latch engagement and locking |
| US10229760B2 (en) | 2013-03-15 | 2019-03-12 | Bwxt Mpower, Inc. | CRDM with separate scram latch engagement and locking |
| CN103646673B (en) * | 2013-12-13 | 2016-02-03 | 中国科学院上海应用物理研究所 | A kind of scram system and method for control rod drive mechanisms (CRD) |
| FR3044156B1 (en) * | 2015-11-23 | 2017-11-10 | Commissariat Energie Atomique | PASSIVE TRIP SECURITY DEVICE FOR NUCLEAR REACTOR ON ABNORMAL PRIMARY RATE DROP |
| FR3044155B1 (en) * | 2015-11-23 | 2017-11-10 | Commissariat Energie Atomique | PASSIVE TRIP SECURITY DEVICE FOR NUCLEAR REACTOR ON ABNORMAL PRIMARY RATE DROP |
| CN114373558A (en) * | 2021-12-08 | 2022-04-19 | 华能核能技术研究院有限公司 | High temperature reactor control rod drive mechanism test bed |
-
2002
- 2002-11-14 CN CNB021486379A patent/CN1182541C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1405788A (en) | 2003-03-26 |
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