CN1119818C - Control bar driving mechanism in completely closed electromagnet with movable coil - Google Patents
Control bar driving mechanism in completely closed electromagnet with movable coil Download PDFInfo
- Publication number
- CN1119818C CN1119818C CN99125934A CN99125934A CN1119818C CN 1119818 C CN1119818 C CN 1119818C CN 99125934 A CN99125934 A CN 99125934A CN 99125934 A CN99125934 A CN 99125934A CN 1119818 C CN1119818 C CN 1119818C
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- Prior art keywords
- armature
- sealing
- assembly
- links
- control rod
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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
Abstract
The present invention belongs to the technical field of nuclear reactor. The present invention comprises an upper supporting assembly, a lower supporting assembly, a sealing barrel, a guide rod, a ballscrew, a stepper motor and a rotary encoder, wherein the sealing barrel is fixed between the upper supporting assembly and the lower supporting assembly; the stepper motor is arranged under the lower supporting assembly and is connected with the ballscrew; the rotary encoder is connected to the other end of the motor. A nut supporting assembly is arranged on the guide rod, a connecting rod is arranged in the sealing barrel, and a buffer is arranged under an armature. A terminal switch is fixed to the terminal site of the armature outside the sealing barrel, and the upper end of the sealing barrel is provided with a block valve. The present invention enhances reactive accuracy controlling the nuclear reactor, and refueling and other operation can be conveniently carried out; the reliability of a system is enhanced, and cost and fabrication difficulty are reduced.
Description
Technical field
The invention belongs to the nuclear reactor technology field, the particularly control rod drive mechanisms (CRD) of nuclear reactor design.
Background technology
Control rod drive mechanisms (CRD) is to be used for making RCC assembly (control rod) to be in appropriate location in the reactor core.Control rod drive mechanisms (CRD) can promote or following plug in control rod assembly according to instruction, or makes it to remain on a certain fixed position, thus the function of finishing reactor start-up respectively, regulating power and holding power.As make mechanism's outage, control rod then rely on gravity to fall into reactor core, thereby realize emergency shut-down.Each RCC assembly is all by own independent control rod drive mechanisms (CRD) operation.
The control rod drive mechanisms (CRD) that present presurized water reactor generally uses is the magnetic force hoisting device.Its structure and principle are as shown in Figure 1 and Figure 2.Be in all parts in the pressure shield 9, as movable clamping pin pawl 4, stationary gripper latch 7 and driving shaft 8 etc., all be exposed in the reactor coolant, the insertion or the extraction of control rod are finished like this: give the lifting coil 2 on three fixed positions in order, movable clamping coil 3, stationary gripper coil 6 energisings or outage, the magnetic field that coil produces is passed pressure shield and is acted on lifting magnetic pole 1 respectively, movable magnetic pole 10, on fixed magnetic pole 5 and the corresponding armature, armature drives movable pin pawl 4 or 7 engagements of fixed pin pawl or discharges, make the driving shaft 8 that has groove do step-type moving up and down, thereby drive the control rod motion.Whenever finish once circulation, control rod can promote or insert a step.With the 900Mwe of Daya Bay nuclear power plant presurized water reactor is example, and the lifting of its control rod drive mechanisms (CRD) and following slotting speed are 1143mm/min, and step pitch is 15.9mm.For some is the purpose reactor with the experiment, need control its reactivity more accurately, and it is too big that such step pitch just seems.And because the restriction on the above-mentioned magnetic force hoisting principle of device, further reducing step pitch significantly has been impossible.
Summary of the invention
The objective of the invention is to have developed a kind of control bar driving mechanism in completely closed electromagnet with movable coil in order to overcome the weak point of above-mentioned prior art.It not only makes the lifting of control rod and inserts action down becomes subcontinuous, can improve reactive degree of accuracy of control reactor greatly, and have and can reload easily and other operations, improve the reliability of system, reduce cost and the plurality of advantages of manufacture difficulty.
The control bar driving mechanism in completely closed electromagnet with movable coil of the present invention's design, comprise upper and lower bearing assembly, be fixed in sealing bore, guide pole and ball-screw between this upper and lower bearing assembly, place lower support assembly below and stepper motor that links to each other with this ball-screw and the rotary encoder that is connected in this motor other end; Be installed in the nut support assembly on this guide pole, this nut support assembly one side bearing connects ball nut, and the opposite side moving winding assembly outer with being placed in sealing bore links to each other; One connecting rod places in the said sealing bore, and the upper end and the reactor control rod of this connecting rod are rigidly connected, and its lower end links to each other with armature; The armature bottom is provided with impact damper; Limit switches are fixed in the outer armature of sealing bore stroke destination county up and down; The appropriate location of sealing tube upper end also is provided with a block valve.
The said block valve of the present invention, it comprises housing, corrugated tube, screw rod, four connecting rods-slide block mechanism and the two groups of seal heads up and down that move that driven by them on the housing guide rail, this corrugated tube soldering and sealing is between screw rod and housing.Realize external totally-enclosed.
Principal feature of the present invention is:
(1) the present invention makes the lifting of control rod and inserts down action becomes subcontinuously, can improve reactive degree of accuracy of control reactor greatly.Solved the too big shortcoming of prior art step pitch like this.
(2) upwards promote control rod from stillpot shell bottom, promptly take the scheme of bottom-up transmission, to guarantee that reactor can reload and other operations easily from top.
(3) driving mechanism adopts the transmission of totally enclosed moving coil electromagnet.This transmission can guarantee the integrality on major loop border, and this point is identical with prior art.But, prior art is in the pressure shield of sealing, quite complicated structure is arranged, as magnetic pole, armature, pin pawl, driving shaft and various spring, pin or the like, more than all parts all in the major loop border, therefore all quite high to the manufacturing requirement of these parts, the inefficacy of any part all can cause serious consequence, and the cost of maintenance is also very high.Have only armature, connecting rod, impact damper in the sealing bore of the present invention, simplified the major loop border greatly with interior structure.The major part of driving mechanism all is in beyond the major loop border, therefore can use conventional technology, material and facility, has improved the reliability of system, has reduced cost and manufacture difficulty significantly, and maintenance cost has also obviously reduced.
Description of drawings
Fig. 1 is the prior art structural representation.
Fig. 2 is the prior art fundamental diagram.
Fig. 3 is a control rod drive mechanisms (CRD) embodiment organigram of the present invention.
Fig. 4 is the structure enlarged diagram of stop valve among Fig. 3.
Fig. 5 is a D-D cross section cut-away view among Fig. 4.
Fig. 6 is an A place structure enlarged diagram among Fig. 3.
Embodiment
The present invention designs a kind of control bar driving mechanism in completely closed electromagnet with movable coil embodiment, its structure such as Fig. 3-and shown in Figure 6, be described with reference to the accompanying drawings as follows:
The general structure of present embodiment as shown in Figure 3.Among the figure, what be positioned at the entire mechanism foot is rotary encoder 01, and it links with the driving shaft that is positioned at the stepper motor 02 on its top, writes down the rotating speed and the corner of stepper motor with this; The ball-screw 04 on its top of drive shaft of stepper motor rotates, thereby drive ball nut 05 moves up and down; Ball nut links to each other with nut support assembly 06, the nut support assembly further drives moving winding assembly 08 and moves up and down, the magnetic field penetration sealing bore 13 that solenoid energising back in the moving winding assembly produces acts on the armature 07, and electromagnetic force drives armature and moves up and down, as shown in Figure 6; Moving bearing assembly 10 is supporting moving winding assembly 08 jointly with nut support assembly 06 and is moving along guide pole 09; The upper end of armature 07 is a connecting rod 11, and the upper end and the reactor control rod of connecting rod are rigidly connected.Entire mechanism is supported jointly by upper support assembly 12 and lower support assembly 03.When armature arrived the high-low limit position, the limit switches 15 that are installed in the outer extreme position of sealing bore can provide control signal, make armature position be unlikely to surmount boundary, and limit switches have standardized product to select.When emergency shut-down, armature is then fallen on the impact damper 16 of its underpart.Appropriate location in sealing bore upper end is provided with a block valve 14, need overhaul or reactor need reload the time when control rod drive mechanisms (CRD), and block valve 14 will be locked.
Whole device most critical partly has three mechanisms:
1) is positioned at the step motor drive mechanism 02 of bottom.At this, stepper motor by first Application in reactor control rod driving mechanism.Utilize the accurate control characteristic of stepper motor, i.e. the command pulse number that the total displacement strictness of stepper motor equals to import, its mean speed strictness is proportional to the frequency of input instruction pulse; Simultaneously in its working frequency range, can stably be transformed into another kind of motion state from a kind of motion state---just be based on above characteristic, reactor control rod just is achieved by instruction and promotes with predetermined speed or slotting down predetermined distance, thereby realizes the precision control to pile reactivity.Stepper motor has saved traditional reductor and detent after introducing driving mechanism, has simplified mechanism, has saved the space, and is very important to the simplification of control rod drive mechanisms (CRD).
2) movable coil block 08.Drive ball-screw by stepper motor and rotate, thereby make ball nut drag solenoid to move up and down, the motion of coil further drives again and is positioned at its inner armature and synchronously moves, and finishes whole driving-chain.
3) be positioned at the block valve 14 on whole device top, as Fig. 4, shown in Figure 5.Externally do not leak when normal reactor operation, when needs overhauled control rod drive mechanisms (CRD), block valve should guarantee that the major loop chilled water does not leak, and it is stuck to be positioned at its inner connecting rod again.Block valve comprises shell, corrugated tube, screw rod, four connecting rods-slide block mechanism and the two groups of seal heads up and down that move that driven by them on the housing guide rail.All mechanisms are realized external totally-enclosed by housing and corrugated tube.This function is achieved in that rotating valve handle 17, screw rod on it drives parallel-crank mechanism 18, and then drive the slide block 19 on the housing guide rail, move, slide block drives seal head 20 and connecting rod is blocked and simultaneously major loop is sealed, the sealing surface of seal head 20 is provided with sealing gasket, to realize the sealing to connecting rod.Between screw rod and shell 21, a corrugated tube 22 in soldering and sealing.Like this, entire mechanism is just totally-enclosed by shell and corrugated tube.
The principle of work of present embodiment is: electromagnet armature is in the sealing bore that links to each other with the sealing of pond shell, and solenoid is in outside the sealing bore.When the solenoid energising, the magnetic field that coil produces is passed sealing bore and is acted on the armature, and armature and coil keep relatively-stationary position relation.At this moment coil is different with existing magnetic force hoisting device, and it is movable.Coil movement drives armature, and armature is rigidly connected from lower end and control rod (be positioned at small end, do not mark among the figure) by connecting rod, promotes control rod and moves up and down, the control reactor.When solenoid cuts off the power supply, comprise control rod, connecting rod, the motion assembly of armature will fall under action of gravity, fall into reactor core until control rod.Armature is then fallen on the impact damper of bottom.
Solenoid is to be driven by its drive system.The power source of drive system is a stepper motor, the direct rotation ball leading screw of stepper motor, and the nut of ball-screw drags the coil that is supported on the support and moves up and down.
The position indication of control rod comprises two parts: indication of rod position and the indication of control rod high-low limit position continuously.Continuously rod position indicator signal is by providing with the rigidly connected rotary encoder of step motor shaft.And the high-low limit position indicative signal is to send by being installed near the limit switches that are in outside the sealing bore armature high-low limit position.
Upper end at sealing bore is provided with block valve.This valve can block the passage that communicates with major loop at connecting rod by under the state of valve, and is simultaneously that connecting rod is stuck.This valve is mainly used in when carry out the reactor core maintenance or reload etc. operated, and connecting rod is stuck; To the drive system maintenance, need open under the situation of sealing bore, block the passage that communicates with major loop substantially with it, prevent a large amount of losses of the chilled water of major loop.Block valve comprises by screw rod, four connecting rods-slide block mechanism and two groups of seal heads up and down that move on the housing guide rail of being driven by their.Corrugated tube of soldering and sealing between screw rod and valve body, external totally-enclosed to realize.
The main design parameters of present embodiment:
The control rod translational speed: normal: 1 mm/second is quick: 1.6 mm/second
Emergency shut-down: passed through core height in 0.9 second
Core height: 750 millimeters
Control rod drive mechanisms (CRD) design runlength: 900 millimeters
Moving component gross weight: 323N (282N in the water)
The feed pull maximum of control rod drive mechanisms (CRD): 〉=700 newton
Solenoid input voltage: 50 volts of direct currents
The course of work of present embodiment is:
(1) under nominal situation, the stepper motor rotational lead screw, leading screw promotes solenoid, and coil promotes the control rod assembly by armature.The translational speed of control rod assembly is 1mm/s and 1.6mm/s.When motor one cut off the power supply mutually, then it was in hold mode, and control rod will remain on the given position.The continuous position signal of control rod (absolute number amount) is provided by the rotary encoder that directly links with leading screw.When control rod arrived the high-low limit position, being installed in the outer limit switches of sealing bore will move, and provides open close signal.
(2) emergency shut-down: under urgent situation, the electromagnet outage, the control rod assembly falls into reactor core rapidly under action of gravity.Then, stepper motor outage because not self-locking of ball-screw, thus under action of gravity, also can landing to terminal.At this moment, even electromagnet does not cut off the power supply, the control rod assembly also can slowly fall into reactor core with coil.The speed that the control rod assembly promptly falls into reactor core can be as the criterion by core height in 0.9 second for making it.
(3) start: the startup of control rod drive mechanisms (CRD), only after the control rod assembly fell into reactor core, moving coil was got back to the smallest limit position, under the condition that armature and coil align fully, could begin.
Claims (2)
1, a kind of control bar driving mechanism in completely closed electromagnet with movable coil, it is characterized in that, comprise upper and lower bearing assembly, be fixed in sealing bore, guide pole, the ball-screw between this upper and lower bearing assembly and place the stepper motor and the rotary encoder of lower support assembly below, the driving shaft of this stepper motor links to each other with ball-screw, and the other end of this motor driving shaft links to each other with rotary encoder; Be installed in moving bearing assembly and nut support assembly on this guide pole, a side of nut support assembly connects ball nut, and the lower end of the moving winding assembly that opposite side is outer with being placed in sealing bore links to each other; Moving bearing assembly links to each other with the upper end of moving winding assembly; One connecting rod places in the said sealing bore, and the upper end and the reactor control rod of this connecting rod are rigidly connected, and its lower end links to each other with armature; The armature bottom is provided with impact damper; Limit switches are fixed in the outer armature of sealing bore stroke destination county up and down; The appropriate location of sealing tube upper end also is provided with a block valve.
2, the control bar driving mechanism in completely closed electromagnet with movable coil that is used for as claimed in claim 1, it is characterized in that, said block valve, it comprises housing, corrugated tube, screw rod, four connecting rods-slide block mechanism and the two groups of seal heads up and down that move that driven by them on the guide rail of housing, this corrugated tube soldering and sealing is between screw rod and housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99125934A CN1119818C (en) | 1999-12-10 | 1999-12-10 | Control bar driving mechanism in completely closed electromagnet with movable coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99125934A CN1119818C (en) | 1999-12-10 | 1999-12-10 | Control bar driving mechanism in completely closed electromagnet with movable coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1256497A CN1256497A (en) | 2000-06-14 |
| CN1119818C true CN1119818C (en) | 2003-08-27 |
Family
ID=5284237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99125934A Expired - Fee Related CN1119818C (en) | 1999-12-10 | 1999-12-10 | Control bar driving mechanism in completely closed electromagnet with movable coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1119818C (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10032529B2 (en) * | 2010-12-09 | 2018-07-24 | Westinghouse Electric Company Llc | Nuclear reactor internal electric control rod drive mechanism assembly |
| DE102011008202B3 (en) * | 2011-01-11 | 2012-06-14 | Areva Np Gmbh | Safety device for a control rod in a nuclear facility |
| US9911512B2 (en) | 2012-02-27 | 2018-03-06 | Bwxt Mpower, Inc. | CRDM internal electrical connector |
| US9805832B2 (en) | 2012-02-27 | 2017-10-31 | Bwxt Mpower, Inc. | Control rod drive mechanism (CRDM) mounting system for pressurized water reactors |
| CN104520938A (en) * | 2012-04-17 | 2015-04-15 | 巴布科克和威尔科克斯M能量股份有限公司 | CRDM internal electrical connector |
| CN102854425A (en) * | 2012-09-29 | 2013-01-02 | 北京博润宏达科技发展有限公司 | High-speed electromagnetic valve performance detection system |
| CN105788668A (en) * | 2016-05-06 | 2016-07-20 | 上海核工程研究设计院 | Split nut driven control rod drive mechanism |
| CN105788667A (en) * | 2016-05-06 | 2016-07-20 | 上海核工程研究设计院 | Control rod driving mechanism of floating type reactor |
| CN106402310B (en) * | 2016-11-14 | 2019-03-08 | 清华大学天津高端装备研究院 | A kind of material-changing device with antifriction self-locking function |
| CN107651562A (en) * | 2017-09-08 | 2018-02-02 | 芜湖市长江起重设备制造有限公司 | A kind of steering driving mechanism of bridge crane |
| CN107665741A (en) * | 2017-11-01 | 2018-02-06 | 上海核工程研究设计院有限公司 | A kind of control rod for nuclear reactor component is kept and release structure |
| CN108231217A (en) * | 2018-01-23 | 2018-06-29 | 上海第机床厂有限公司 | Presurized water reactor control rod drive mechanism and its assembly method |
| CN111415763A (en) * | 2020-03-30 | 2020-07-14 | 中国原子能科学研究院 | Driving method of control rod driving mechanism for fast reactor |
| CN111811618A (en) * | 2020-07-24 | 2020-10-23 | 交通运输部天津水运工程科学研究所 | High-precision water level automatic measuring instrument for model test |
| CN112071446B (en) * | 2020-08-27 | 2022-09-16 | 清华大学 | Built-in control rod driving wire |
| CN111968759B (en) * | 2020-09-16 | 2023-03-14 | 北京新龙立自动化设备有限公司 | Supporting device and rod pulling machine with same |
| CN114420327A (en) * | 2022-01-28 | 2022-04-29 | 上海核工程研究设计院有限公司 | Rod position measuring device and method of motor-driven control rod driving mechanism |
-
1999
- 1999-12-10 CN CN99125934A patent/CN1119818C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1256497A (en) | 2000-06-14 |
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