CN108695004A - Waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type - Google Patents
Waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type Download PDFInfo
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/20—Disposition of shock-absorbing devices ; Braking arrangements
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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
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Abstract
Include hydraulic buffer cylinder, compressed spring and its base baffle, visualization casing, passive shut-down rod lower end plug structure on inlet piping flanges the invention discloses a kind of waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type;Wherein hydraulic buffer cylinder is divided into two parts up and down by compressed spring base baffle, and lower part is equidistantly uniformly provided with one group of inlet opening circumferential, and top is equidistantly provided with three groups of pressure relief vents in circumferential direction, and upper end is processed as tapered through-hole;Passive shut-down rod lower end plug structure includes the bottom end cover of damping block and cone, and wherein damping block is circumferentially equidistantly provided with one group of through flow hole, and passive shut-down rod intermediate casing is connected above damping block;The present invention combines necking down Transition Design and compressed spring, significantly reduces the total rod drop time of passive shut-down rod;Radial clearance intake design makes coolant velocity distribution more uniform simultaneously, improves the suspension stability of passive shut-down rod.
Description
Technical field
The invention belongs to nuclear power plants to protect system equipment performance verification experimental study technical field, and in particular to Yi Zhongyong
In the waterpower buffer structure of the passive shutdown experimental provision of hydraulic suspension type.
Technical background
The passive shutdown experimental provision of hydraulic suspension type is outstanding to sodium-cooled fast reactor fluid power as the Substitute Working Medium of sodium using water
The passive shutdown unit dynamic characteristic of floating carries out the platform of experimental study.The passive shutdown unit of hydraulic suspension type is a kind of sodium
The emergent Reactor trip device of cold fast reactor is designed as the control rod under accidental conditions and is cooled the upward fluid power maintenance of agent
Be suspended in reactor core top, the operating modes such as loss-of-flow accident cause coolant flow drop to be not enough to maintain control rod suspend when, control
Stick processed falls to reactor core position and realizes shutdown.From operation principle it can be seen that the action of floated control rod is to be based on changes in flow rate
, control rod model can be fallen from stable state levitation position in a manner of freely falling body after experiment triggering every time, visual when dropping to
The maximum speed that changing may have when sleeve bottom reaches 4.43m/s, and the quality of control rod model is about 18kg, so high speed
Impact failure can be caused to the flow conditioner and suction flange structure for visualizing sleeve bottom, it is therefore desirable to quality visual
Change sleeve bottom and the scram impact that one buffer unit slows down control rod model is installed, protects end plug under control rod model, flowing
Adjuster and suction flange structure are not destroyed.Simultaneously as needing to carry out the experiment of multiplicating property to test Hydrodynamic suspension
The dynamic response characteristic of the passive shutdown unit of formula and the reliability of action, the buffer unit should be able to also be in 90 DEG C of water environments
Lower long-term work, performance do not decay.
The basic principle of control rod accident scram buffer unit is by various designs, by the kinetic energy of C&P systems whereabouts
Interior energy, potential energy or the strain energy of buffer structure are converted to, impact force is reduced, C&P systems and cladding tubes structure is protected not to occur
It destroys.
Traditional commercial water-water reactor nuclear power station reactor control stick buffer unit is the control rod guide pipe end in fuel assembly
End one section of undergauge section of setting or setting buffering plug endoporus, such as Chinese patent CN103971760A, CN105761765A, are falling
Stick latter stage squeezes the coolant in guide pipe by control rod and generates upward fluid force, is played to Control rod drive line mechanism slow
Punching acts on.This is simple in structure, but is only applicable to cluster type control rod component, can not be generalized to the passive shutdown dress of hydraulic suspension type
The C&P systems of other structures property such as set.
Advanced nuclear reactor of new generation generally requires to use different control rod buffer structures according to specific structure design.
For example, Chinese patent CN103413577A, it is proposed that a kind of thin wall cylinder for buffering high temperature gas cooled reactor control rod dropping shock
Buffer compresses thin wall cylinder generation plastic buckling deformation absorption impact energy when axial dropping shock occurs by holding impact ring
Amount, to protect the structure below pedestal not destroy.The design is a kind of victim buffer to protect the one of understructure
Secondary property buffer structure is not suitable for the passive shutdown unit of hydraulic suspension type for needing long term repeatability to act.Chinese patent
CN102280146A needs to pacify for the permanent magnet damping component and the hybrid retarder of electromagnetic damping component of high temperature gas cooled reactor proposition
On the transmission shaft of Control rod drive line, scram speed can effectively be controlled in the event of an accident.But Hydrodynamic suspension
Control rod in the passive shutdown unit of formula is to be detached from Control rod drive line with passive state independence in reactor operation
Operation, therefore the retarder can not be used.
For another example, Chinese patent CN103646673A discloses a kind of scram system and method for control rod drive mechanism, should
System passes through chain, sleeve of the fixed pulley connection equipped with the screw-drive mechanism being made of spin friction disk and friction plate, control
Chain-driving cage guiding bar moves when stick scram, and guide rod is effectively buffered by screw-drive mechanism and sufficient damping.The system
For molten salt reactor structure design, control rod operating head is connected with chain always, therefore is not suitable for control rod and is run with separate state
The passive shutdown unit of hydraulic suspension type.
For another example, Chinese patent CN106653104A discloses a kind of reactivity control for liquid heavy metal cooled reactor
Mechanism processed, scram buffer gear design wherein included is similar with traditional water-water reactor nuclear power station, and by being oriented in control rod
Pipe end is arranged one section of reducing area and is oriented to row buffering of going forward side by side to C&P systems offer whereabouts.The structure is only applicable to cluster type
C&P systems do not consider in control rod guide pipe there are the suspension of larger coolant flow and low operating position holding,
Therefore the passive shutdown unit of hydraulic suspension type it is not suitable for yet.
To meet the needs of passive shutdown experimental provision scram of hydraulic suspension type buffers, our research groups, which once design, to be added
A kind of hydraulic buffer of through type of work, as shown in Figure 1, including:Hydraulic buffer 1 ', visualization casing 2 ', control rod are led
To pipe 3 ', position-limit mechanism 4 ', top header ' and passive shut-down rod model 6 ';Its principle is coolant from hydraulic buffer 1 '
The through-hole at center is directly entered visualization casing 2 ' and control rod guide pipe 3 ' flows up offer hydraulic thrust and remains passive
Shut-down rod model 6 ' is suspended in operating position;Flow declines when carrying out Rod drop test, and passive shut-down rod model 6 ' is by gravity
It is inserted into hydraulic buffer 1 ' under effect, compresses buffer spring and the coolant transitional impact of buffer inside and lower section inducer
Energy is until terminate scram.But in its experiment and calculation and check, it is found that this design is uneven to control rod due to intaking
Suspension stability is affected, and increases the uncertainty of experimental data measurement, and will appear apparent water hammer in scram
Effect is unfavorable for protection test section and the safety of centrifugal pump.In view of the foregoing, it needs to buffer this through type waterpower at present
Device is improved.
Invention content
The purpose of the present invention is exactly the shortcomings that overcoming the above-mentioned prior art and deficiency, and providing one kind can grow at high temperature
Phase is reliably suitable for using realizing effective scram deceleration buffer, ensureing control rod stable suspersion and capable of inhibiting water hammer effect
The hydraulic buffer of the passive shutdown experimental provision of sodium-cooled fast reactor hydraulic suspension type.
The purpose of the present invention is what is realized by using following technical scheme:
A kind of waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type, the buffer structure are included in
Visualize setting hydraulic buffer and passive shut-down rod model lower end plug structure in casing 15;The hydraulic buffer includes water
Power buffer cylinder 7, hydraulic buffer cylinder 7 are vertically mounted on the 2 upper surface center of inlet piping flanges of visualization casing 15, water
7 lower end of power buffer cylinder is coolant inlet runner 1, and hydraulic buffer cylinder 7 is divided by the compressed spring base baffle 4 in it
Two parts up and down are divided into, lower part is provided with several pressure relief vents 9, upper end being arranged circumferentially several inlet openings 3, top in circumferential direction
It is processed as tapered through-hole 8;5 one end of cylindrical compression spring is fixed on compressed spring base baffle 4, and the other end is connected with buffering
Washer 6;Passive shut-down rod model lower end plug structure includes damping block 12 and the bottom end cover 11 in 12 lower end of damping block is arranged,
Shut-down rod model will not float when middle damping block 12 is circumferentially equidistantly uniformly provided with several through flow holes to ensure low discharge operating mode,
12 top of damping block connects passive shut-down rod model intermediate casing 13, and 12 outer diameter of the damping block is less than hydraulic buffer cylinder
7 internal diameters, passive 13 outer diameter of shut-down rod model intermediate casing are more than 7 internal diameter of hydraulic buffer cylinder, and hydraulic buffer cylinder 7 is grown
Degree is less than the sum of damping block 12 and 11 length of bottom end cover;The absorber stick model 14 of several positive triangles arrangement is pressed abd fixed on non-
In active shut-down rod model intermediate casing 13, and as passive shut-down rod model is along gravity direction whereabouts, damping block 12 is under
End cap 11 can be guided insertion in corresponding hydraulic buffer cylinder 7.
The inlet opening 3 is key-way shape hole, and quantity is M, and the M is the even number more than or equal to 2, and each inlet opening is along waterpower
The circumferentially spaced-apart 360 °/M in 7 lower part of buffer cylinder is uniformly distributed, 3 top edge of inlet opening and 4 lower face of compressed spring base baffle
It flushes, one third of the total cross section of fluid channel product that the inlet opening 3 provides not less than 1 sectional area of coolant inlet runner.
The pressure relief vent 9 is round hole, and quantity is 12, along 7 top of hydraulic buffer cylinder with three rows of a determining deviation point
Arrangement is often arranged circumferentially spaced 90 ° of 4 pressure relief vents and is uniformly distributed, the ranging from 0.5mm-2mm in 9 aperture of each pressure relief vent.
The tapered through-hole 8 is located at 7 upper end of hydraulic buffer cylinder, is 15 ° with axial angle, and top edge adds
Work is the decrement inducer with 0.5mm fillets, and lower edge is machined with round-corner transition.
5 outer diameter of the cylindrical compression spring matches with 7 internal diameter of hydraulic buffer cylinder, and free height is logical less than tapered
8 lower end of hole, 5 both ends of cylindrical compression spring polish, and lower end is welded on 4 upper surface of compressed spring base baffle, with hydraulic buffer
Cylinder 7 is concentric, upper end waterproof glue sticking buffer gasket 6, and is reinforced using steel wire winding;The buffer gasket 6 is that annular is straight
Angle triangular-section, bevel edge match with passive shut-down rod model bottom end cover 11, it is preferable that bevel edge interior angle angle is 15-
30°。
7 outer diameter of hydraulic buffer cylinder matches with visualization 15 suction flange internal diameter of casing.
The bottom end cover 11 is conical structure, and the replaceable bottom end cover with different cone angle carries out experimental study;Resistance
Buddhist nun's block 12 is the thin barrel structure of cylinder, and wall thickness 2-4mm, the height of damping block 12 is 2-4 times of its outer diameter, 12 cylinder ring of damping block
To several round through flow holes are equidistantly uniformly provided with, a diameter of 5-10mm of each through flow hole, through flow hole is arbitrary shape;Bottom end cover
It is coaxially connected by pipe screw thread between 11 and damping block 12, damping block 12 and passive shut-down rod model intermediate casing 13, under
Gradually increase to top external diameter, chamfering is all machined with close to junction in bottom end cover 11 and passive shut-down rod model intermediate casing 13
Transition.
15 material of visualization casing is organic glass, and 5 material of cylindrical compression spring is manganese steel and outer surface is through antirust
Processing, 6 material of buffer gasket are silicon rubber, and 14 material of absorber stick model is nylon, and other structural materials are 304 stainless
Steel.
Coolant enters the visualization casing in visualization casing 15 from coolant inlet channel 1 through inlet opening 3 when experiment
Runner 10, from bottom to top flowing maintain passive shut-down rod model to be suspended in operating position;It is less than when flow drops to fluid force
When gravity, passive shut-down rod model starts to fall, and bottom end cover 11 enters hydraulic buffer cylinder 7 along tapered through-hole 8 at first,
The coolant in 7 top endoporus of hydraulic buffer cylinder is squeezed out, waterpower pooling feature is realized, as damping block 12 is further inserted
Enter hydraulic buffer cylinder 7, the beginning of bottom end cover 11 is contacted with buffer gasket 6, is acted on by cylindrical compression spring 5 and is realized that deceleration is slow
Punching optimizes buffering effect by undergauge and compressed spring double action.
The present invention has the following advantages and beneficial effect:
1. necking down Transition Design and compressed spring are organically combined together by hydraulic buffer of the present invention, significantly subtract
The rod drop time for having lacked passive shut-down rod realizes effective scram deceleration buffer.
Make coolant velocity distribution more uniform 2. hydraulic buffer cylinder uses radial clearance intake design, significantly
Improve the suspension stability of passive shut-down rod.
3. the design of damping block through flow hole can not only prevent shut-down rod from surprisingly floating when low discharge reloads operating mode, moreover it is possible to
Effectively reduce rod drop time.
4. passive shut-down rod and hydraulic buffer are all located in visualization casing, entire scram buffering course can be carried out
Sight is looked into and is measured.
5. it is reasonable in design, (90 DEG C) can be used reliably and with long-term under high temperature environment, performance does not decay.
In short, apparatus of the present invention effectively can carry out deceleration buffer to shut-down rod, associated components and structure, design are protected
Rationally, simple in structure, space is saved in sturdy and durable, high efficient and reliable, integrated design, is suitble to be assemblied in hydraulic suspension type passive
Shutdown experimental provision.
Attachment explanation
Fig. 1 is the passive integrally-built three dimensional sectional view of shutdown experimental provision of hydraulic suspension type in the prior art.
Fig. 2 is the waterpower buffer structure three-dimensional sectional of the present invention for the passive shutdown experimental provision of hydraulic suspension type
Figure.
Specific implementation mode
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
It is described in further detail.
With reference to Fig. 2, a kind of hydraulic buffer for the passive shutdown experimental provision of hydraulic suspension type of the present invention
Structure, including inlet piping flanges 2, inlet opening 3, compressed spring base baffle 4, cylindrical compression spring 5, buffer gasket 6, waterpower are slow
Rush device cylinder 7, tapered through-hole 8, pressure relief vent 9, bottom end cover 11, damping block 12, passive 13 and of shut-down rod model intermediate casing
Visualize casing 15.
Shown in Fig. 2 is the structural schematic diagram of hydraulic buffer and matching component of the present invention, and hydraulic buffer cylinder 7 is vertical
It is welded on 2 upper surface center of inlet piping flanges, organic glass hexagon visualizes casing 15 with inlet piping flanges 2 by carrying
The flanged joint of positioning key is vertically-mounted, and Y-shaped ring and O-ring dual-seal is used in combination.By compression bullet inside hydraulic buffer cylinder 7
Spring base baffle 4 is divided into two parts up and down, and lower part is the idol more than or equal to 2 being arranged circumferentially M key-way shape inlet opening 3, M
Number, each circumferentially spaced 360 °/M in inlet opening are uniformly distributed, and inlet opening top edge and 4 lower face of compressed spring base baffle are neat
Flat, total cross section of fluid channel product that inlet opening 3 provides should be not less than the one third of 1 sectional area of coolant inlet runner;Top is in ring
To 12 round pressure relief vents 9 are provided with, are circumferentially set with three arrangement of a determining deviation point, often arrange circumferentially spaced 90 ° of 4 pressure relief vents
The recommendation aperture of even distribution, each pressure relief vent 9 is 0.5mm-2mm;Upper end is processed as tapered through-hole 8, is with axial angle
15 °, and top edge is processed as the decrement inducer with 0.5mm fillets, lower edge is machined with 10mm round-corner transitions.
5 outer diameter of manganese steel cylinder compressed spring matches with 7 internal diameter of hydraulic buffer cylinder, and free height is less than tapered
8 lower end of through-hole, 5 both ends of cylindrical compression spring polish, and lower end is welded on 4 upper surface of compressed spring base baffle, are buffered with waterpower
Device cylinder 7 is concentric, upper end waterproof glue sticking buffer gasket 6, and is reinforced using steel wire winding.Silicon rubber buffer gasket 6 is ring
Shape right triangular cross-sectional, bevel edge match with passive shut-down rod model bottom end cover 11, and recommendation bevel edge interior angle angle is 15-
30°。
Passive shut-down rod die body structure is process by 304 stainless steel cold-drawn pipes, and wherein lower end plug structure includes
Bottom end cover 11 and damping block 12, wherein bottom end cover 11 are processed as conical structure to increase suspension stability and scram speed,
And the replaceable bottom end cover with different cone angle carries out experimental study;Damping block 12 be the thin barrel structure of cylinder, wall thickness 2-4mm,
The height of damping block 12 is 2-4 times of its outer diameter, and 12 cylinder of damping block is circumferential to be equidistantly uniformly provided with several round through flow holes, with
Ensure that shut-down rod model will not float when low discharge operating mode, the preset diameters of each through flow hole are 5-10mm, and through flow hole is alternatively it
He is not limited at arbitrary shape with circle.The 12 passive shut-down rod model intermediate casing 13 of top connection of damping block, several positive three
The nylon absorber stick model 14 of angle arrangement is pressed abd fixed in passive shut-down rod model intermediate casing, and is stopped with passive
Heap stick model falls along gravity direction, and damping block 12 and bottom end cover 11 can be guided insertion to corresponding hydraulic buffer cylinder
In 7.It is coaxial by pipe screw thread between bottom end cover 11 and damping block 12, damping block 12 and passive shut-down rod model intermediate casing 13
Connection, outer diameter gradually increases from bottom to top, bottom end cover 11 and passive shut-down rod model intermediate casing 13 close to junction all
It is machined with suitable chamfered transition;12 outer diameter of damping block is less than 7 internal diameter of hydraulic buffer cylinder, and 13 outer diameter of intermediate casing is more than water
7 internal diameter of power buffer cylinder.
7 outer diameter of hydraulic buffer cylinder matches with visualization 15 suction flange internal diameter of casing, and hydraulic buffer cylinder 7 is grown
Degree is less than the sum of passive shut-down rod model damping block 12 and 11 length of bottom end cover.
In practical applications, the hydraulic buffer is the overall structure being assembled together, and is located in visualization casing 15,
Coolant uniformly flows into visualization casing runner 10 from inlet channel 1 through inlet opening 3, and flowing maintenance is passive from lower to upper stops
Heap stick model is suspended in operating position;When flow drops to fluid force less than gravity, passive shut-down rod model starts to fall,
Bottom end cover 11 enters hydraulic buffer cylinder 7 along tapered through-hole 8 at first, squeezes out in 7 top endoporus of hydraulic buffer cylinder
Coolant realizes waterpower pooling feature, and as damping block 12 is further inserted into hydraulic buffer cylinder 7, bottom end cover 11 starts
It is contacted with buffer gasket 6, cylindrical compression spring 5 provides elastic damping deceleration buffer, passes through undergauge and compressed spring double action
Optimize buffering effect.
By being used in the passive shutdown experimental loop of certain hydraulic suspension type and in experiment to scram end time speed
Degree, stressing conditions measure analysis, it was demonstrated that hydraulic buffer design disclosure satisfy that related experiment requirement, and protection is passive to stop
Heap stick model and sleeve structure do not destroy.Hydraulic buffer and passive shut-down rod bottom end cover are observed after many experiments,
Apparent damage or abrasion are not found.And since its design is simple, compact, experimentation cost is greatly saved, experiment is reduced
Section desired height.Therefore, the present invention is very suitable for the passive shutdown experimental provision assembly use of hydraulic suspension type.
The above content is only used for illustrating the present invention, and it cannot be said that the specific implementation mode of the present invention is only limitted to this, for this
For the those of ordinary skill of technical field that the present invention belongs to, as long as carrying out various modification and variations to the present invention does not depart from the present invention
Connotation and range, all should be considered as within the scope of claims of the present invention and its equivalent technologies.
Claims (8)
1. a kind of waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type, which is characterized in that the buffering
Structure includes:Setting hydraulic buffer and passive shut-down rod model lower end plug structure in visualization casing (15);The water
Power buffer includes hydraulic buffer cylinder (7), and hydraulic buffer cylinder (7) is vertically mounted on the import of visualization casing (15)
Pipe flange (2) upper surface center, hydraulic buffer cylinder (7) lower end are coolant inlet runner (1), hydraulic buffer cylinder
(7) two parts, lower part up and down are divided by the compressed spring base baffle (4) in it and are being arranged circumferentially several inlet openings (3),
Top is provided with several pressure relief vents (9) in circumferential direction, and upper end is processed as tapered through-hole (8);Cylindrical compression spring (5) one end is solid
It is scheduled on compressed spring base baffle (4), the other end is connected with buffer gasket (6);Passive shut-down rod model lower end plug structure
Including damping block (12) and setting in the bottom end cover (11) of damping block (12) lower end, wherein damping block (12) is circumferentially equidistantly equal
Even shut-down rod model when being provided with several through flow holes to ensure low discharge operating mode will not float, and connection is passive above damping block (12)
Shut-down rod model intermediate casing (13), damping block (12) outer diameter are less than hydraulic buffer cylinder (7) internal diameter, passive shutdown
Stick model intermediate casing (13) outer diameter is more than hydraulic buffer cylinder (7) internal diameter, and hydraulic buffer cylinder (7) length is less than damping
The sum of block (12) and bottom end cover (11) length;The absorber stick model (14) of several positive triangles arrangement is pressed abd fixed on passive
In shut-down rod model intermediate casing (13), and as passive shut-down rod model falls along gravity direction, damping block (12) and under
End cap (11) can be guided insertion in corresponding hydraulic buffer cylinder (7).
2. a kind of waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type according to claim 1,
It is characterized in that, the inlet opening (3) is key-way shape hole, quantity is M, and the M is the even number more than or equal to 2, each inlet opening
Along hydraulic buffer cylinder (7) lower part, circumferentially spaced-apart 360 °/M is uniformly distributed, and inlet opening (3) top edge is kept off with compressed spring pedestal
Plate (4) lower face flushes, and total cross section of fluid channel product that the inlet opening (3) provides is not less than coolant inlet runner (1) sectional area
One third.
3. a kind of waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type according to claim 1,
It is characterized in that, the pressure relief vent (9) is the round hole of pore diameter range 0.5mm-2mm, quantity is 12, is justified along hydraulic buffer
Cylinder (7) top is set with three arrangement of a determining deviation point, is often arranged circumferentially spaced 90 ° of 4 pressure relief vents and is uniformly distributed.
4. a kind of waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type according to claim 1,
It is characterized in that, the tapered through-hole (8) is located at hydraulic buffer cylinder (7) upper end, it is 15 ° with axial angle, and
Top edge is processed as the decrement inducer with 0.5mm fillets, and lower edge is machined with 10mm round-corner transitions.
5. a kind of waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type according to claim 1,
It is characterized in that, cylindrical compression spring (5) outer diameter matches with hydraulic buffer cylinder (7) internal diameter, free height is less than
Tapered through-hole (8) lower end, cylindrical compression spring (5) both ends polish, and lower end is welded on compressed spring base baffle (4) upper end
Face, upper end waterproof glue sticking buffer gasket (6) concentric with hydraulic buffer cylinder (7), and reinforced using steel wire winding;Institute
It states buffer gasket (6) and uses silastic material, annular right-angle triangular-section, bevel edge interior angle angle and passive shut-down rod model
Bottom end cover (11) angle of taper matches.
6. a kind of waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type according to claim 1,
It is characterized in that, the visualization casing (15) uses pmma material, inside and outside is regular hexagon structure, hydraulic buffer
Cylinder (7) outer diameter matches with visualization casing (15) suction flange internal diameter.
7. a kind of waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type according to claim 1,
It is characterized in that, the bottom end cover (11) is conical structure, and the replaceable bottom end cover with different cone angle carries out experiment and grinds
Study carefully;Damping block (12) is the thin barrel structure of cylinder, and wall thickness 2-4mm, the height of damping block (12) is 2-4 times of its outer diameter, damping
Block (12) cylinder is circumferential to be equidistantly uniformly provided with several round through flow holes, a diameter of 5-10mm of each through flow hole;Bottom end cover (11)
It is coaxially connected by pipe screw thread between damping block (12), damping block (12) and passive shut-down rod model intermediate casing (13),
Outer diameter gradually increases from bottom to top, all adds close to junction in bottom end cover (11) and passive shut-down rod model intermediate casing (13)
Work has chamfered transition.
8. a kind of according to any one of claim 1~7 is for the passive shutdown experimental provision of hydraulic suspension type
Waterpower buffer structure, it is characterised in that:Coolant enters through inlet opening (3) from coolant inlet channel (1) and visualizes when experiment
Visualization casing runner (10) in casing (15), from bottom to top flowing maintain passive shut-down rod model to be suspended in working position
It sets;When flow drops to fluid force less than gravity, passive shut-down rod model starts to fall, and bottom end cover (11) is at first along tapered
Shape through-hole (8) enters hydraulic buffer cylinder (7), squeezes out the coolant in the endoporus of hydraulic buffer cylinder (7) top, realizes
Waterpower pooling feature, as damping block (12) is further inserted into hydraulic buffer cylinder (7), bottom end cover (11) starts and cushion pad
(6) contact is enclosed, is acted on by cylindrical compression spring (5) and realizes deceleration buffer, is optimized by undergauge and compressed spring double action slow
Rush effect.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110148481A (en) * | 2019-06-03 | 2019-08-20 | 中国原子能科学研究院 | The judgment method of reactor hydraulic safe rod drives operating status |
| WO2020134808A1 (en) * | 2018-12-29 | 2020-07-02 | 清华大学 | Spherical object falling cushioning device |
| CN112017794A (en) * | 2020-07-31 | 2020-12-01 | 清华大学 | Spring box |
| CN112037943A (en) * | 2020-07-28 | 2020-12-04 | 中国原子能科学研究院 | Hydraulic suspension split type passive shutdown assembly for fast neutron reactor |
| CN113744898A (en) * | 2021-08-03 | 2021-12-03 | 西安交通大学 | Passive shutdown device and control method thereof |
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| US5761260A (en) * | 1996-05-29 | 1998-06-02 | Commissariat A L'energie Atomique | Device for uncoupling a control rod from an absorbing element for a nuclear reactor |
| CN103413577A (en) * | 2013-07-26 | 2013-11-27 | 清华大学 | Thin-walled cylinder buffer for buffering drop impact of high-temperature gas cooled reactor control rod |
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| CN112037943A (en) * | 2020-07-28 | 2020-12-04 | 中国原子能科学研究院 | Hydraulic suspension split type passive shutdown assembly for fast neutron reactor |
| CN112037943B (en) * | 2020-07-28 | 2023-03-14 | 中国原子能科学研究院 | Hydraulic suspension split type passive shutdown assembly for fast neutron reactor |
| CN112017794A (en) * | 2020-07-31 | 2020-12-01 | 清华大学 | Spring box |
| CN112017794B (en) * | 2020-07-31 | 2022-09-23 | 清华大学 | Spring box |
| CN113744898A (en) * | 2021-08-03 | 2021-12-03 | 西安交通大学 | Passive shutdown device and control method thereof |
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