CN109830319B - Flow plug for high-temperature gas cooled reactor - Google Patents
Flow plug for high-temperature gas cooled reactor Download PDFInfo
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- CN109830319B CN109830319B CN201811467411.6A CN201811467411A CN109830319B CN 109830319 B CN109830319 B CN 109830319B CN 201811467411 A CN201811467411 A CN 201811467411A CN 109830319 B CN109830319 B CN 109830319B
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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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Abstract
The invention relates to the technical field of reactor corollary equipment, and discloses a flow plug for a high-temperature gas cooled reactor, which comprises a shell and a rotor assembly, wherein the shell is provided with a plurality of air holes; a cavity is arranged in the shell, and a feed inlet and a discharge outlet which are communicated with the cavity are arranged on the shell; the rotor assembly comprises a rotating shaft and a rotating disc; the rotating shaft is rotatably arranged in the cavity around the axis of the rotating shaft, the rotating disc is coaxially arranged on the rotating shaft, and the peripheral surface of the rotating disc is in clearance fit with the curved surface of the cavity; the peripheral surface of the rotary table is provided with a plurality of positioning grooves and at least one material receiving cup for containing materials, and the material receiving cup is positioned between two adjacent positioning grooves; all inlay in every constant head tank and be equipped with the elasticity piece, the surface butt curved surface of cavity of elasticity piece to prevent gaseous circulation between feed inlet and discharge gate. The flow plug realizes buffering by arranging the elastic block and utilizing elasticity, can keep normal circulation and loading and unloading of spherical elements, has higher reliability in long-term operation, and can realize high-temperature thermal expansion compensation and mechanical wear compensation.
Description
Technical Field
The invention relates to the technical field of reactor corollary equipment, in particular to a flow plug for a high-temperature gas cooled reactor.
Background
The ball bed high temperature gas cooled reactor has the advantage of continuous refueling without stopping the reactor, and the fuel loading and unloading system with full automatic operation is the key for ensuring the on-line continuous operation of the ball bed high temperature gas cooled reactor. The fuel loading and unloading system utilizes the favorable geometric shape of the spherical fuel elements and adopts two spherical fuel element conveying modes to realize the circulation, loading and unloading operations of the spherical fuel elements, wherein one mode is to realize gravity conveying by utilizing the dead weight of the spherical elements, and the other mode is to realize pneumatic conveying by utilizing compressed gas.
The Chinese invention patent (publication No. CN103474113B) discloses a composition and a process flow of a pebble bed modular high-temperature gas cooled reactor fuel loading and unloading system, which comprises six helium pneumatic conveying loops and branches for fuel circulation and spent fuel unloading under the condition of double reactors, and a compressed air pneumatic conveying loop for secondary lifting of spent fuel. Because the fuel circulation and the unloading quantity are large and the speed is high, the fuel enters the reactor core spent fuel temporary storage device in a continuous discrete sphere flow mode in the pipeline. These pneumatic conveying circuits and branches cannot be physically completely isolated from the core, and the pressure and temperature of the circuits differ from the core. Thus, the pneumatic transport circuit is not only closely related to the primary pressure level, but also has flow exchange with the core at the top and bottom of the core. In order to ensure the stability of the pneumatic transmission and piling of the spherical elements, a flow resisting device for limiting the air flow exchange is arranged before the inlet of the ball path for starting the pneumatic transmission.
The Chinese patent of invention (publication No. CN103778982B) discloses a flow plug for high temperature gas cooled reactor, the rotor of the flow plug is provided with a deep hole ball receiving cup which can contain two spherical elements and a certain amount of chippings and dust, and the rotor is provided with an arc-shaped vent groove and vent holes. Although the air choke has the functions of stopping air flow and buffering the falling of the spherical elements, the rotor of the air choke is matched with a rotor counter bore of a box body in a micro clearance mode, and each spherical element is conveyed to rotate once, so that under the severe conditions of high temperature, strong radioactivity, falling vibration of the spherical elements, high-frequency operation, bearing clearance change and the like, after long-term operation, the matching between the rotor and the box body and the friction and wear are intensified, the matching clearance is increased, eccentric operation can occur, the flow choking effect is weakened, and the normal pneumatic conveying and the circulation, loading and unloading of the spherical elements are influenced.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a flow plug for a high-temperature gas cooled reactor, which has a good flow blocking effect and mechanical compensation capacity, so as to solve the problems of poor anti-seismic performance and eccentric operation of the existing flow plug.
(II) technical scheme
In order to solve the above technical problems, the present invention provides a flow plug for a high temperature gas cooled reactor, which includes a housing and a rotor assembly; a cavity is arranged in the shell, and a feed inlet and a discharge outlet which are communicated with the cavity are arranged on the shell; the rotor assembly comprises a rotating shaft and a rotating disc; the rotating shaft is rotatably arranged in the cavity around the axis of the rotating shaft, the rotating disc is coaxially arranged on the rotating shaft, and the peripheral surface of the rotating disc is in clearance fit with the curved surface of the cavity; the peripheral surface of the rotary table is provided with a plurality of positioning grooves and at least one material receiving cup for containing materials, and the material receiving cup is positioned between two adjacent positioning grooves; every all inlay in the constant head tank and be equipped with the elasticity piece, the surface butt of elasticity piece the curved surface of cavity to prevent gas be in the feed inlet with circulate between the discharge gate.
The positioning grooves are uniformly distributed on the outer peripheral surface of the rotary disc at equal angles.
The elastic block comprises an inner magnetic pole and an outer magnetic pole which are mutually repulsive in magnetism, the inner magnetic pole is arranged at the bottom of the positioning groove, one end of the outer magnetic pole is opposite to the inner magnetic pole, and the other end of the outer magnetic pole is abutted to the curved surface of the cavity.
The flow plug also comprises an inner lining ring, the outer surface of the inner lining ring is in transition fit with the curved surface of the cavity, and the inner surface of the inner lining ring is in clearance fit with the outer peripheral surface of the rotating disc; the position of the inner lining ring corresponding to the feed inlet is provided with a feed hole, and the position of the inner lining ring corresponding to the discharge hole is provided with a discharge hole.
The axis of the feed port is superposed with the axis of the discharge port and is intersected with the axis of the rotary disc; the central angle of the arc between two adjacent positioning grooves is less than or equal to 180 degrees.
The material receiving cup comprises a shell, wherein the shell is provided with a plurality of material receiving cups, the number of the material receiving cups is two, the central angle of the two material receiving cups opposite to the circular arc is equal to 180 degrees, the turntable is provided with a limiting groove, and the shell is provided with a limiting column matched with the limiting groove.
Wherein, the spoiler also comprises a power assembly and a magnetic driver; the magnetic driver comprises an inner magnetic assembly, an isolation cover, an outer magnetic assembly and a bracket which are sequentially arranged from inside to outside, wherein the outer magnetic assembly and the inner magnetic assembly form magnetic coupling connection; the inner magnetic assembly is connected with the rotating shaft, and the bracket is connected with the shell so as to tightly press the isolation cover and the shell; the power assembly is connected with the outer magnetic assembly to drive the outer magnetic assembly to rotate.
Wherein, the spoiler still includes the angle feedback sensor who sets up on magnetic actuator.
The power assembly comprises a motor, and the motor is connected with the outer magnetic assembly sequentially through a speed reducer and a metal coupler.
The power component is arranged in the shielding sleeve.
(III) advantageous effects
Compared with the prior art, the invention has the following advantages:
the invention provides a flow plug for a high-temperature gas cooled reactor, which utilizes clearance fit between a rotary table and the inner wall of a shell cavity, and simultaneously sets a plurality of groups of elastic blocks on the rotary table to abut against the inner wall of the shell cavity so as to form a flow blocking matching surface. Under the action of elastic force, the flow plug can bear and offset the impact force of the spherical element falling at high speed, and can constantly keep a good dynamic compaction state when the turntable performs eccentric operation and bearing play changes, so that the flow plug has a relatively stable flow blocking sealing effect, normal pneumatic transmission and the circulation, the loading and unloading of the spherical element are kept, and the reliability of long-term operation is higher. Meanwhile, the elastic block also has a good compensation function, so that machining errors and assembly errors can be eliminated, the installation and maintenance are convenient, high-temperature thermal expansion compensation and mechanical wear compensation can be realized, the air dam can operate in a severe high-temperature, high-radioactivity and high-strength use environment, and the environmental adaptability of the air dam is improved.
Drawings
FIG. 1 is a front view of a flow plug for a high temperature gas cooled reactor according to an embodiment of the present invention;
FIG. 2 is a sectional view of a casing of a flow plug for a high temperature gas cooled reactor according to an embodiment of the present invention;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic view illustrating a choke flow principle of a choke for a high temperature gas cooled reactor according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating four operating states of a flow plug for a high temperature gas cooled reactor according to an embodiment of the present invention;
FIG. 6 is a schematic partially cut-away isometric view of another flow plug for a high temperature gas cooled reactor in an embodiment of the invention;
FIG. 7 is a schematic illustration of the assembly of the rotating disk and the inner liner ring of the air dam of FIG. 6;
FIG. 8 is a cross-sectional view of the disk of the air dam of FIG. 6;
description of reference numerals:
100: a power assembly; 101: a motor; 102: a speed reducer;
103: a shielding sleeve; 104: a metal coupling; 200: a magnetic driver;
201: an external magnetic assembly; 202: a support; 203: an inner magnetic assembly;
204: an isolation cover; 205: a first fastener; 206: a first seal member;
207: stopping the opening; 300: a rotor assembly; 301: a spline;
302: a rotating shaft; 303: a first bearing; 304: an inner guard plate;
305: a turntable; 306: an outer guard plate; 307: a second bearing;
308: a receiving cup; 308-1: a first receiving cup; 308-2: a second receiving cup;
308-3: a third receiving cup; 308-4: a fourth receiving cup; 309: an elastic block;
309-1: a first elastic block; 309-2: a second elastic block; 309-3: a third elastic block;
309-4: a fourth elastic block; 310: an outer magnetic pole; 310-1: a first outer magnetic pole;
310-2: a second outer magnetic pole; 310-3: a third outer magnetic pole; 310-4: a fourth outer magnetic pole;
311: an inner magnetic pole; 311-1: a first inner magnetic pole; 311-2: a second inner magnetic pole;
311-3: a third inner magnetic pole; 311-4: a fourth inner magnetic pole; 312: positioning a groove;
312-1: a first positioning groove; 312-2: a second positioning groove; 312-3: a third positioning groove;
312-4: a fourth positioning groove; 313: the outer peripheral surface of the turntable; 314: an outer surface of the resilient block;
315: a limiting groove; 400: a housing; 401: an end face flange;
402: a second fastener; 403: a second seal member; 404: a chamber;
405: a feeding pipe connection; 406: a cavity; 407: a discharging connecting pipe;
408: a feed inlet; 409: a discharge port; 410: a limiting hole;
411: a column; 500: an internal component; 501: an inner liner ring;
502: positioning a plate; 503: a bearing seat; 504: a material passing hole;
504-1: a feed port; 504-2: a discharge hole; 505: a positioning column;
506: an inner surface of the liner ring; 507: a gap; 600: a spherical element;
601: a first spherical element; 602: a second spherical element; 603: a third spherical element;
604: a fourth spherical element.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described below with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "first", "second", "third", "fourth", "fifth", "sixth", etc. are used for clearly indicating the numbering of the product elements and do not represent any substantial difference. "preceding" and "succeeding" are described based on the arrangement order. The directions of the upper part, the lower part, the left part and the right part are all based on the directions shown in the attached drawings. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be understood that, unless otherwise expressly stated or limited, the term "coupled" is used in a generic sense as defined herein, e.g., fixedly attached or removably attached or integrally attached; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present invention, "a plurality", and "a plurality" mean two or more unless otherwise specified.
Fig. 1 is a front view, cut away in structure, of an air dam for a high temperature gas cooled reactor according to an embodiment of the present invention, fig. 2 is a cut away view of an internal structure of a casing according to an embodiment of the present invention, fig. 3 is a sectional view taken along a-a in fig. 2, and as shown in fig. 1 to 3, an air dam for a high temperature gas cooled reactor according to an embodiment of the present invention includes a casing 400 and a rotor assembly 300. The housing 400 comprises a left end face flange 401 and a right cavity 406, and the end face flange 401 and the cavity 406 are fixedly connected through a second fastener 402 and a second seal 403. The second fastener 402 comprises a detachable connector consisting of a plurality of groups of bolts, nuts and washers, and is convenient to mount, dismount, repair and replace. The connecting piece can be dismantled to the multiunit is along end flange 401's circumference evenly distributed, closely the pressfitting on cavity 406 with end flange 401, prevents revealing of radioactive gas, sets up second sealing member 403 on end flange 401 and cavity 406's pressfitting face simultaneously, adopts metal O shape sealing washer, and sealing strength is higher, and the effect is better. The end flange 401 and the cavity 406 together form a complete pressure-bearing boundary.
The cavity 406 is a regular octagonal prism with a cylindrical counterbore inside, which with the end flange 401 encloses a cylindrical chamber 404. The cavity 406 is provided with an upper inlet 408 and a lower outlet 409 which are communicated with the cavity 404. The feeding port 408 is welded with a feeding connecting pipe 405, the discharging port 409 is welded with a discharging connecting pipe 407, and the feeding connecting pipe 405 and the discharging connecting pipe 407 are connected with a fuel loading and unloading system to realize the transportation of the spherical element 600.
The rotor assembly 300 includes a rotating shaft 302 and a turntable 305. The shaft 302 is rotatably supported about its axis within the chamber 404, and the turntable 305 is coaxially disposed on the shaft 302. In this embodiment, the rotating shaft 302 and the rotating disc 305 are integrally formed, so that the rotating shaft 302 and the rotating disc 305 can rotate synchronously without deviation. Besides, the turntable 305 can be sleeved on the rotating shaft 302. As shown in fig. 1 and fig. 2, the rotating shaft 302 is a stepped shaft and sequentially includes a first shaft segment to a sixth shaft segment from left to right, where the second shaft segment is a shaft having a spline 301, the third shaft segment is positioned and installed with a first bearing 303, the turntable 305 is positioned between the fourth shaft segment and the fifth shaft segment, and the sixth shaft segment is positioned and installed with a second bearing 307. The rotating shaft 302 is rotatably connected with the chamber 404 through a first bearing 303 and a second bearing 307, wherein the first bearing 303 is installed in a bearing seat 503, and the bearing seat 503 is fixed in the chamber 404; the second bearing 307 is mounted in a small counterbore at the right end of the chamber 404.
As shown in fig. 3, the turntable 305 is a circular disk, the outer peripheral surface 313 of the turntable is in clearance fit with the curved surface of the chamber 404, and the clearance 507 is larger than zero, i.e. the diameter of the turntable 305 is smaller than the inner diameter of the chamber 404. As shown in FIG. 2, the turntable 305 has an inner fender 304 mounted on a left side surface thereof and an outer fender 306 mounted on a right side surface thereof. The outer circumferential surface 313 of the rotating disk is circumferentially provided with a plurality of positioning grooves 312 and at least one receiving cup 308 for containing materials, and the receiving cup 308 is located between two adjacent positioning grooves 312. The material in this embodiment is mainly spherical fuel element in high temperature gas cooled reactor, so the receiving cup 308 is a cylindrical counter bore with spherical bottom, and its inner diameter is matched with the spherical element 600 to be transported. The spherical element 600 uses graphite as a matrix, and due to poor ductility of graphite material, the spherical element 600 collides and wears with pipelines and equipment during multiple core circulation and loading and unloading processes, and although the spherical element 600 has sufficient strength in design, the probability of breakage is inevitable.
In addition, since the spherical elements 600 are rapidly pneumatically conveyed away after being discharged from the receiving cup 308, under DCS control, two spherical elements 600 do not simultaneously appear in the same receiving cup 308. Therefore, the receiving cup 308 must have some debris and dust holding capacity in addition to being able to hold a complete spherical element 600. The spherical element 600 in this embodiment has a diameter of 60mm and the receiving cup 308 has a diameter of 65 mm. Meanwhile, the cup bottom of the receiving cup 308 is tapered to contain a certain amount of debris and dust, so that the height of the receiving cup 308 is 70 mm.
As shown in fig. 3, each positioning groove 312 is embedded with a resilient block 309, and an outer surface 314 of the resilient block abuts against a curved surface of the chamber 404 to prevent gas from flowing between the inlet 408 and the outlet 409. While the resilient block 309 is confined within the inner fender 304 and the outer fender 306 mounted to the turntable 305. The resilient block 309 is an elastic cube, the inner surface of which is attached to the bottom of the positioning groove 312, and the outer surface of which is an arc surface attached to and abutting against the curved surface of the chamber 404. The thickness of the resilient block 309 is greater than the depth of the positioning groove 312, i.e. the resilient block 309 is higher than the outer peripheral surface of the turntable 305. Meanwhile, the width of the outer surface 314 of the elastic block is larger than the diameter of the feed port 408 and equal to or slightly larger than the thickness of the rotary disc 305, so that the feed port 408 and the discharge port 409 can be blocked, and the air flow is prevented from entering the rotary disc 305. The moderate compression spring force provided by the spring block 309 urges the spring block 309 against the inner surface of the chamber 404 forming a sealing surface against which the airflow is backed to prevent it from passing. In addition, under the action of the elastic force, the elastic block 309 also has a compensation function to eliminate machining errors and assembly errors, and perform thermal expansion and mechanical wear compensation.
The flow plug for high temperature gas cooled reactor provided by this embodiment utilizes clearance fit between the turntable and the inner wall of the housing chamber, and sets multiple sets of elastic blocks on the turntable to abut against the inner wall of the housing chamber to form a flow blocking fitting surface. Under the action of elastic force, the flow plug can bear and offset the impact force of the spherical element falling at high speed, and can constantly keep a good dynamic compaction state when the turntable performs eccentric operation and bearing play changes, so that the flow plug has a relatively stable flow blocking sealing effect, normal pneumatic transmission and the circulation, the loading and unloading of the spherical element are kept, and the reliability of long-term operation is higher. Meanwhile, the elastic block also has a good compensation function, so that machining errors and assembly errors can be eliminated, the installation and maintenance are convenient, high-temperature thermal expansion compensation and mechanical wear compensation can be realized, the air dam can operate in a severe high-temperature, high-radioactivity and high-strength use environment, and the environmental adaptability of the air dam is improved.
Further, as shown in fig. 3, the elastic block 309 employs a magnetic spring having mutually magnetically repulsive permanent magnetic poles, and includes mutually repulsive inner magnetic poles 311 and outer magnetic poles 310, the inner magnetic poles 311 are disposed at the bottom of the positioning groove 312, one end of the outer magnetic poles 310 is opposite to the inner magnetic poles 311, and the other end of the outer magnetic poles 310 abuts against the curved surface of the cavity 404. Due to the repulsive force, a certain gap exists between the inner pole 311 and the outer pole 310. In a specific embodiment, the inner pole 311 and the outer pole 310 are made of samarium cobalt rare earth cobalt permanent magnet material with good temperature resistance and magnetic property. The volume of the spring block 309 can be reduced by using a magnetic spring, which facilitates installation. The spring block 309 may also use other elastic elements to provide the spring force, in addition to the magnetic spring.
Further, as shown in fig. 3, the flow plug for high temperature gas cooled reactor in the present embodiment further includes an inner lining ring 501, and an outer surface of the inner lining ring 501 is in transition fit with the curved surface of the chamber 404, where the transition fit refers to a fit that may have a clearance or an interference, and if the fit is a clearance fit, the fit is a fitting surface with a clearance smaller than 0.5 mm. The inner surface 506 of the liner ring is a clearance fit with the outer circumferential surface 313 of the turntable. The inner liner 501 comprises two layers of loops with an inner reinforcing layer and an outer matching layer.
The inner lining ring 501 is provided with a material passing hole 504 so that the spherical element 600 can smoothly enter the turntable 305 and be transferred out. Specifically, the lining ring 501 is provided with a feeding hole 504-1 corresponding to the feeding hole 408, and a discharging hole 504-2 corresponding to the discharging hole 409. During the rotation of the turntable 305, the elastic block 309 and the inner lining ring 501 form a pair of friction pairs, and in order to ensure the reliability and the service life of the friction pairs, the elastic block 309 and the inner lining ring 501 are both made of wear-resistant materials or are subjected to surface treatment to form wear-resistant surfaces. Once worn, the inner ring 501 and the spring block 309 may be repaired or replaced. The inner lining ring can reduce the abrasion of the inner wall of the chamber, so that the long-term reliable use of the shell can be ensured without frequent replacement.
Further, as shown in fig. 2 and 3, the axis of the inlet 408 and the axis of the outlet 409 coincide and intersect the axis of the turntable 305. I.e., the inlet port 408 and the outlet port 409, are coaxially disposed and pass through the center of the turntable 305. At this time, the central angle subtended by the circular arcs between two adjacent positioning slots 312 is less than or equal to 180 degrees, that is, when the turntable 305 rotates at any position, at least one elastic block 309 is arranged between the feeding port 408 and the discharging port 409 to block flow. If the number of the positioning slots 312 is two, the axes of the two positioning slots 312 are on the same straight line and pass through the center of the turntable 305, so that the arc degree of the two positioning slots 312 is 180 degrees in both clockwise and counterclockwise directions, which is equal to the central angle between the feeding hole 408 and the discharging hole 409. Specifically, the feed inlet 408, the discharge outlet 409, the feed hole 504-1, the discharge hole 504-2, the feed connection pipe 405 and the discharge connection pipe 407 are coaxial and have the same inner diameter.
Further, as shown in fig. 3, the positioning grooves 312 are uniformly distributed on the outer circumferential surface 313 of the turntable at equal angles. The number of the positioning grooves 312 may be two or more positive integers. In this embodiment, four positioning slots 312 and four receiving cups 308 are taken as an example, and the positioning slots 312 and the receiving cups 308 are arranged in a staggered manner, that is, one receiving cup 308 is arranged between two adjacent positioning slots 312, and one positioning slot 312 is also arranged between two adjacent receiving cups 308. Specifically, when viewed from the feed inlet along the counterclockwise direction, a first receiving cup 308-1, a first positioning groove 312-1, a second receiving cup 308-2, a second positioning groove 312-2, a third receiving cup 308-3, a third positioning groove 312-3, a fourth receiving cup 308-4 and a fourth positioning groove 312-4 are sequentially arranged. The central angles of the circular arcs between two adjacent positioning grooves 312 and between two adjacent receiving cups 308 are equal to 90 degrees, that is, the circular arcs are arranged in a circumferential array.
A magnetic spring block 309 is installed in each positioning groove 312. Specifically, a first elastic block 309-1 is installed in the first positioning groove 312-1, and the first elastic block 309-1 comprises a first inner magnetic pole 311-1 and a first outer magnetic pole 310-1; a second elastic block 309-2 is arranged in the second positioning groove 312-2, and the second elastic block 309-2 comprises a second inner magnetic pole 311-2 and a second outer magnetic pole 310-2; a third elastic block 309-3 is arranged in the third positioning groove 312-3, and the third elastic block 309-3 comprises a third inner magnetic pole 311-3 and a third outer magnetic pole 310-3; the fourth positioning groove 312-4 is provided with a fourth resilient block 309-4, and the fourth resilient block 309-4 comprises a fourth inner magnetic pole 311-4 and a fourth outer magnetic pole 310-4. Therefore, even if the elastic blocks 309 are deviated from the material passing holes 504, because the four elastic blocks 309 are arranged in an array, when the turntable 305 rotates to any position, at least one elastic block 309 is in contact with the lining ring 501 on both sides of the ball passing hole 504 on the lining ring 501, and the upstream and downstream air is sealed in a flow-resisting manner.
Fig. 4 is a schematic diagram illustrating a flow blocking principle of a flow blocker for a high temperature gas cooled reactor according to an embodiment of the present invention, as shown in fig. 4, when the rotary table 305 is rotated to a position where the receiving cup 308 faces the discharge port 409. The airflow flows from bottom to top, enters the flow plug from the discharge connecting pipe 407 and the discharge port 409, neglects the possible small gap on the side of the turntable 305, enters the gap 507 between the inner lining ring 501 and the turntable 305 through the material passing hole 504, and is blocked by two friction pairs formed by the left second elastic block 309-2, the right third elastic block 309-3 and the inner lining ring 501, so that the airflow can be prevented from passing through, and the upstream and downstream airflow blocking function of the flow plug can be realized.
Further, as shown in fig. 1 and 2, the flow plug for a high temperature gas cooled reactor further includes a power assembly 100 and a magnetic driver 200. The magnetic driver 200 is a cylindrical magnetic driver with a lag angle less than 0.2 degrees, and comprises an inner magnetic assembly 203, a separation cover 204, an outer magnetic assembly 201 and a bracket 202 which are arranged from inside to outside in sequence. The isolation cover 204 is made of a titanium alloy material. The bracket 202 is connected with the housing 400 to press the isolation cover 204 tightly against the housing 400.
Specifically, a spigot 207 is arranged on the end face flange 401, the isolation cover 204 is limited by the spigot 207, and is pressed on the end face flange 401 by the coaxially arranged bracket 202, and is detachably connected and sealed through a first fastener 205 and a first sealing element 206. The magnetic actuator 200 is supported by an end flange 401. The outer magnet assembly 201 is located between the bracket 202 and the cage 204, and the outer magnet assembly 201 is provided with a bearing on the side in contact with the cage 204. The inner magnetic assembly 203 is located between the shaft 302 and the cage 204, and the inner magnetic assembly 203 is provided with a bearing on the side that contacts the cage 204.
More specifically, the first bearing 303 and the second bearing 307 of the rotor assembly 300 and the bearings inside the magnetic driver 200 are made of heat-resistant and wear-resistant alloy bearings with polyimide retainers, the polyimide retainers with radiation-resistant and self-lubricating properties provide solid lubricating films, and the heat-resistant and wear-resistant alloy has better plasticity and toughness than ceramic bearings, so that the long-life operation requirements of temperature resistance and radiation resistance of the bearings are met.
In addition, the power assembly 100 comprises a motor 101, the motor 101 is connected with the outer magnetic assembly 201 sequentially through a speed reducer 102 and a metal coupler 104 so as to drive the outer magnetic assembly 201 to rotate, and meanwhile, the inner magnetic assembly 203 is connected with a rotating shaft 302 through a spline 301. The outer magnetic assembly 201 receives the rotational motion output by the power assembly 100, and drives the inner magnetic assembly 203 to rotate through magnetic coupling, thereby driving the rotating shaft 302 to rotate.
Under the instruction of a nuclear power plant DCS main control system, a speed reducer 102 directly connected with a motor 101 drives an outer magnetic assembly 201 to synchronously rotate, and under the action of magnetic coupling, after a magnetic field penetrates through an isolation cover 204, an inner magnetic assembly 203 and a rotor assembly 300 directly connected with the inner magnetic assembly 203 are driven to synchronously rotate, so that flexible mechanical transmission under a non-contact condition is realized, dynamic sealing is converted into static sealing, sealing of radioactive thermal state helium is realized, and the operating environment of a power assembly 100 is also improved. During the process of material receiving and rotation of the air dam, the spherical element 600 in the material receiving cup 308 in the rotating disc 305 has strong radioactivity, the magnetic driver 200 adopts a thin and long compact cylindrical structure, and the outer magnetic assembly 201 and the inner magnetic assembly 203 have enough shielding thickness not only in the length direction, but also in the radial direction, so that the power assembly 100 can be protected from excessive gamma ray accumulated radioactive dose caused by short-time ball stopping.
Further, the flow plug for the high temperature gas cooled reactor further includes an angle feedback sensor disposed on the magnetic driver 200. Under the condition that the turntable 305 is continuously operated, if power failure or related faults occur, the rotor assembly 300 needs to be re-zeroed, and accurate position information of the rotor assembly 300 is difficult to obtain from the outside of the isolation cover 204 due to the fact that the magnetic driver 200 is in a non-contact soft connection. This problem is solved by providing an angle feedback sensor in the magnetic actuator 200. The basic principle of the angle feedback sensor is that a magnetic limiter is arranged on an inner magnetic assembly 203, a magnetic probe is arranged at the corresponding position of an isolation cover 204, and when the magnetic limiter rotates to the corresponding position of the magnetic probe, the angle sensor can detect a real-time corner and timely adjust the real-time corner to an initial corner based on permanent magnet coupling and Hall effect so as to ensure the stability of receiving and conveying spherical elements.
Further, the motor 101 employs an ac servo motor with a resolver, the ac servo motor 101 has a good torque-frequency characteristic, and the resolver provided therewith has a high resolution, and the rotational speed and the rotational angle are accurately controlled by controlling the driver and the resolver to perform rotational angle feedback. The speed reducer 102 is used for providing output torque to ensure that the actuating mechanism moves stably, and a servo system can be ensured to meet the requirements of frequently starting and stopping, stable operation and accurate and in-place rotation angle control of an output shaft.
Further, a shielding sleeve 103 is sleeved on the outer side of the support 202, and the power assembly 100 is placed in the shielding sleeve 103. The shielding sleeve 103 is a steel integral workpiece, one end of the shielding sleeve is positioned with the support 202 of the magnetic driver 200, the other end of the shielding sleeve is supported on an equipment steel frame or a steel platform to take root, and the motor 101 and the speed reducer 102 are arranged on the shielding sleeve 103 to limit the radial gamma ray accumulated dose of the spherical element 600 in the surrounding spherical flow pipeline to the motor 101 and the speed reducer 102. Since the instantaneous radiation exposure of the power assembly 100 to oblique radiation during the flow of the spherical element 600 is relatively small, a smaller thickness of the shielding 103 is sufficient.
Further, as shown in fig. 2, the flow plug for high temperature gas cooled reactor in the present embodiment further includes an inner assembly 500, and the inner assembly 500 further includes a positioning plate 502 in addition to the above-mentioned lining ring 501 and bearing seat 503. The positioning plate 502 is embedded in the inner wall of the housing 400, and the bearing seat 503 is fixed in the cavity 404 by the positioning column 505, thereby playing a role of positioning the turntable 305.
The flow plug in the present embodiment will be further described with reference to specific working processes.
Fig. 5 is a schematic diagram illustrating four operation states of a choke for a high temperature gas cooled reactor according to an embodiment of the present invention, in which a in fig. 5 is an initial state of the choke, b in fig. 5 is a state in which the choke rotates clockwise by 90 degrees, c in fig. 5 is a state in which the choke rotates clockwise by 180 degrees, and d in fig. 5 is a state in which the choke rotates clockwise by 270 degrees. As shown in fig. 5, when the first receiving cup 308-1 is located in the axial direction of the feed nipple 405, the first spherical member 601 from upstream falls into the first receiving cup 308-1. Subsequently, the turntable 305 rotates clockwise, which causes the first spherical element 601 to rotate. After 90 degrees of rotation, the first spherical element 601 is turned to the right, and the second receiving cup 308-2 is now in the axial direction of the feed connection 405, and the second spherical element 602 from upstream falls into the second receiving cup 308-2. The dial 305 then continues to rotate clockwise and brings the first spherical element 601 and the second spherical element 602 to rotate together. After 180 degrees of rotation, the second spherical element 602 is turned to the right, and the third receiving cup 308-3 is now in the axial direction of the feed connection 405, and the third spherical element 603 from upstream falls into the third receiving cup 308-3. At the same time, the first spherical element 601 rotates downward, the first receiving cup 308-1 is located in the axial direction of the tapping stub 407, and the first spherical element 601 falls from the first receiving cup 308-1 into the tapping stub 407 and is discharged downstream. The dial 305 then continues to rotate clockwise and brings the second spherical element 602 and the third spherical element 603 together. After 270 degrees of rotation, the third spherical element 603 turns to the right, and the fourth receiving cup 308-4 is now in the axial direction of the feed connection 405, and the fourth spherical element 604 from upstream falls into the fourth receiving cup 308-4. At the same time, the second ball-shaped element 602 rotates downward, the second receiving cup 308-2 is located in the axial direction of the tapping stub 407, and the second ball-shaped element 602 falls from the second receiving cup 308-2 into the tapping stub 407 and is discharged downstream. At the same time, the empty first receiving cup 308-1 is turned to the left, and the turntable 305 is rotated further 90 degrees clockwise, so that the first receiving cup 308-1 is again located in the axial direction of the feed connection 405 and receives the next spherical element 600. In this cycle, at the command of the main control system DCS and the motor controller, one spherical element 600 is delivered downstream for each 90 degrees of rotation of the rotor assembly 300, i.e., in the case of flow-resistant seals. In this embodiment, four material receiving cups 308 are uniformly arranged, so that the rotation angle is 90 degrees, and the number of the material receiving cups 308 can be flexibly selected according to needs in actual use, and is not limited to four. Further, the direction of rotation of the turntable 305 may be clockwise, or counterclockwise, or alternately clockwise and counterclockwise.
In addition to the above embodiments, fig. 6 to 8 illustrate another form of a flow plug for a high temperature gas cooled reactor. As shown in fig. 6 to 8, the number of the receiving cups 308 is two, and the number of the positioning grooves 312 is four. The detents 312 are arranged in a circumferential array as in the previous embodiment. Except that the first receiving cup 308-1 is located between the first positioning groove 312-1 and the fourth positioning groove 312-4, and the second receiving cup 308-2 is located between the second positioning groove 312-2 and the third positioning groove 312-3.
The circular arc between the two receiving cups 308 subtends an angle of the centre equal to 180 degrees, i.e. is arranged in mirror symmetry about the axis of the turntable 305 at 180 degrees. The turntable 305 is provided with a circular limiting groove 315, and two upright posts 411 are arranged at two ends of the limiting groove 315, so that the angle of a limiting limit point is 180 degrees. A semi-arc limiting groove can also be arranged on the turntable 305 to realize 180-degree limiting. The housing 400 is provided with a limiting hole 410 engaged with the limiting groove 315, and a limiting post is installed in the limiting hole 410. The limiting column slides in the limiting groove 315 for limiting, so as to limit the rotation angle movement range of the turntable 305. Because the mechanical limit is arranged, the rotor assembly 300 can only operate in a 180-degree reciprocating swing mode, the working efficiency is relatively low, the friction and the abrasion are large, but the structure is simple, and automatic change making is easy.
It can be seen from the above embodiments that the flow plug for a high temperature gas cooled reactor provided by the present invention utilizes the clearance fit between the turntable and the inner wall of the housing chamber, and sets a plurality of sets of elastic blocks on the turntable to abut against the inner wall of the housing chamber to form a flow blocking fitting surface. Under the action of elastic force, the flow plug can bear and offset the impact force of the spherical element falling at high speed, and can constantly keep a good dynamic compaction state when the turntable performs eccentric operation and bearing play changes, so that the flow plug has a relatively stable flow blocking sealing effect, normal pneumatic transmission and the circulation, the loading and unloading of the spherical element are kept, and the reliability of long-term operation is higher. Meanwhile, the elastic block also has a good compensation function, so that machining errors and assembly errors can be eliminated, the installation and maintenance are convenient, high-temperature thermal expansion compensation and mechanical wear compensation can be realized, the air dam can operate in a severe high-temperature, high-radioactivity and high-strength use environment, and the environmental adaptability of the air dam is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The flow plug for the high-temperature gas cooled reactor is characterized by comprising a shell and a rotor assembly; a cavity is arranged in the shell, and a feed inlet and a discharge outlet which are communicated with the cavity are arranged on the shell;
the rotor assembly comprises a rotating shaft and a rotating disc; the rotating shaft is rotatably arranged in the cavity around the axis of the rotating shaft, the rotating disc is coaxially arranged on the rotating shaft, and the peripheral surface of the rotating disc is in clearance fit with the curved surface of the cavity; the peripheral surface of the rotary table is provided with a plurality of positioning grooves and at least one material receiving cup for containing materials, and the material receiving cup is positioned between two adjacent positioning grooves; every all inlay in the constant head tank and be equipped with the elasticity piece, the surface butt of elasticity piece the curved surface of cavity to prevent gas be in the feed inlet with circulate between the discharge gate.
2. The flow plug of claim 1, wherein the positioning slots are uniformly distributed on the outer circumferential surface of the turntable at equal angles.
3. The flow plug for the high-temperature gas-cooled reactor according to claim 1, wherein the elastic block comprises an inner magnetic pole and an outer magnetic pole which are mutually repulsive in magnetism, the inner magnetic pole is arranged at the bottom of the positioning groove, one end of the outer magnetic pole is opposite to the inner magnetic pole, and the other end of the outer magnetic pole abuts against the curved surface of the cavity.
4. The flow plug for a high temperature gas cooled reactor of claim 1, further comprising an inner lining ring, wherein the outer surface of the inner lining ring is in transition fit with the curved surface of the chamber, and the inner surface of the inner lining ring is in clearance fit with the outer circumferential surface of the rotating disc; the position of the inner lining ring corresponding to the feed inlet is provided with a feed hole, and the position of the inner lining ring corresponding to the discharge hole is provided with a discharge hole.
5. The flow plug for a high temperature gas cooled reactor according to claim 1, wherein the axis of the inlet port and the axis of the outlet port are coincident and intersect with the axis of the rotary table; the central angle of the arc between two adjacent positioning grooves is less than or equal to 180 degrees.
6. The flow plug for the high-temperature gas-cooled reactor according to claim 5, wherein the number of the receiving cups is two, a central angle subtended by an arc between the two receiving cups is equal to 180 degrees, the rotating disc is provided with a limiting groove, and the housing is provided with a limiting column matched with the limiting groove.
7. The air dam for the high temperature gas cooled reactor according to any one of claims 1 to 6, further comprising a power assembly and a magnetic driver;
the magnetic driver comprises an inner magnetic assembly, an isolation cover, an outer magnetic assembly and a bracket which are sequentially arranged from inside to outside, wherein the outer magnetic assembly and the inner magnetic assembly form magnetic coupling connection; the inner magnetic assembly is connected with the rotating shaft, and the bracket is connected with the shell so as to tightly press the isolation cover and the shell;
the power assembly is connected with the outer magnetic assembly to drive the outer magnetic assembly to rotate.
8. The flow plug for a high temperature gas cooled reactor of claim 7, further comprising an angle feedback sensor disposed on the magnetic driver.
9. The air dam for the high temperature gas cooled reactor according to claim 7, wherein the power assembly comprises a motor, and the motor is connected with the external magnetic assembly sequentially through a speed reducer and a metal coupling.
10. The flow plug for the high temperature gas cooled reactor as set forth in claim 7, wherein a shielding sleeve is sleeved outside the support, and the power assembly is disposed inside the shielding sleeve.
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| CN201811467411.6A CN109830319B (en) | 2018-12-03 | 2018-12-03 | Flow plug for high-temperature gas cooled reactor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7453442B2 (en) | 2022-08-15 | 2024-03-19 | 清華大学 | High temperature gas furnace flow prevention device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115083644B (en) * | 2022-06-20 | 2023-08-22 | 华能核能技术研究院有限公司 | Ball passing and flow blocking device of high-temperature gas cooled reactor capable of running in one direction |
| CN115171931B (en) * | 2022-06-24 | 2024-01-23 | 华能山东石岛湾核电有限公司 | Material level controllable ball falling device for high-temperature gas cooled reactor |
| CN115050498B (en) * | 2022-06-27 | 2024-01-30 | 华能山东石岛湾核电有限公司 | Reciprocating type choke of high-temperature gas cooled reactor fuel loading and unloading system |
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| CN102097144A (en) * | 2010-11-02 | 2011-06-15 | 清华大学 | Singularized spherical-element conveying device applied to high-temperature gas cooled reactor |
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