CN103762000A - Ball stopper applied to high-temperature gas-cooled reactor - Google Patents

Abstract

The invention provides a ball stopper applied to a high-temperature gas-cooled reactor. The ball stopper includes a box assembly, a power component, a magnetic drive, a rotor assembly and a shield, wherein the box assembly includes a surface with ball passing holes and The box body of the counterbore of the rotor, as well as the goal tube and the ball tube connected to the box, the ball passing hole, the goal tube and the ball tube are coaxial and equal in diameter, and are perpendicular to the rotor counterbore; the rotor assembly includes bearings and The rotor is supported in the rotor counterbore of the box through bearings, and is connected with the inner magnetic assembly of the magnetic drive; the rotor has a rotor through hole, and the diameter of the rotor through hole is the same as that of the ball through hole, the goal tube and the outlet. The diameters of the ball tubes are equal and larger than the diameter of the spherical element; the shield is connected with the support of the magnetic drive, and the power part is placed in the shield and connected with the support of the magnetic drive through a coupling assembly. The ball stopper can perform stop and conduction functions for single-row spherical elements, and can meet the operation reliability requirements of long-term intermittent operation.

Description

A Ball Stopper Applied to High Temperature Gas Cooled Reactor

technical field

The invention relates to reactor engineering, in particular to a ball stopper applied to a high-temperature gas-cooled reactor.

Background technique

The pebble bed high-temperature gas-cooled reactor uses spherical fuel elements (hereinafter referred to as spherical elements) to pass through the core multiple times to achieve non-stop continuous operation. In the HTR-PM demonstration power plant, the number of fuel balls that the dual stacks participate in circulation reaches 12,000 per day, the circulation speed is 250 balls/hour, and the fast circulation speed is as high as 375-500 balls/hour. The spent fuel of each is about 800. Chinese invention patent CN101083153B discloses a high-temperature gas-cooled reactor line refueling system for the HTR-PM project. Compared with the HTR-10 high-temperature gas-cooled experimental reactor, the fuel loading and unloading and cycle load of HTR-PM are greatly improved. In each ball flow pipeline system, in addition to performing the single delivery function, the core fuel cycle burnup measurement process of the online refueling system, the atmosphere switching process of new fuel charging and spent fuel unloading, and other In the pipelines that require temporary storage of fuel balls, a ball stopper that performs on-off functions for a single row of fuel balls in the flow must be installed, and the series of spherical elements can be operated in batches to meet the requirements of operating speed and capacity , so as to ensure the availability and economy of the demonstration power station.

In the prior art, there is a helium space-sealed transmission device that can perform similar functions under the hot working condition of the working chamber containing radioactive dust. Under reliable sealing conditions, the smooth passage of spherical elements, dust and debris is guaranteed. The device is suitable for stopping and passing non-radioactive new fuel balls. For core circulating spherical elements or spent fuel elements with strong radioactivity and residual heat, on the one hand, the amount of single ball stopping is large and the ball stopping time is long. On the one hand, the amount of passing balls is large, so the temperature the device bears is relatively high, and the cumulative gamma ray irradiation dose is large, and the disclosed device cannot meet the reliability requirements of long-term operation.

Contents of the invention

(1) Solved technical problems

Aiming at the deficiencies of the prior art, the present invention provides a ball stopper applied to high-temperature gas-cooled reactors. The ball stopper can perform stop and conduction functions for single-row spherical elements with strong radioactivity and residual heat, and can be used in high-temperature reactors. It can meet the operational reliability requirements of long-term intermittent operation within the service life.

(2) Technical solution

To achieve the above object, the present invention is achieved through the following technical solutions:

A ball stopper applied to a high-temperature gas-cooled reactor, characterized in that the ball stopper includes a box assembly, a power component, a magnetic drive, a rotor assembly, and a shield, wherein:

The box assembly includes a box with a ball passing hole and a rotor counterbore on the surface, and a goal tube and a ball outlet tube welded to the box. The ball passing hole, goal tube and ball outlet tube are the same The shafts are equal in diameter and their axis is perpendicular to the axis of the rotor counterbore;

The magnetic drive includes an inner magnetic assembly, an isolation cover, an outer magnetic assembly and a bracket, the bracket compresses the isolation cover through a first set of fasteners and a first seal, and is connected to the box assembly;

The rotor assembly includes a bearing and a rotor, the rotor is supported in the rotor counterbore of the box through the bearing, and is connected with the inner magnetic assembly of the magnetic drive; the rotor has a rotor through hole whose axis is perpendicular to the axis of the ball through hole , the diameter of the rotor through hole is equal to the diameters of the ball passing hole, the goal pipe and the ball exit pipe, and is greater than the diameter of the spherical element;

The shield is connected with the support of the magnetic drive, and the power part is placed in the shield and connected with the support of the magnetic drive through a coupling assembly.

Preferably, the ball stopper also includes a middle flange provided with cooling fins and through holes, the two ends of the middle flange are respectively connected with the box assembly and the magnetic drive through fasteners and seals, and the rotor The rotating shaft passes through the through hole of the middle flange.

Preferably, the diameters of the rotor through hole, the ball passing hole, the inlet pipe and the ball outlet pipe are in the range of 62-65mm.

Preferably, the power component is composed of an AC servo motor with a resolver and a planetary gear reducer.

Preferably, the bearing is a heat-resistant and wear-resistant alloy bearing.

Preferably, there are two bearings, which are installed on both sides of the rotor in the box respectively.

Preferably, the magnetic material in the magnetic actuator is a rare earth permanent magnet material.

(3) Beneficial effects

The present invention at least has the following beneficial effects:

The present invention mainly implements the function of stopping and conducting the single row of spherical elements by setting the rotor through hole on the rotor. In the case of the power provided by the power part and the transmission of the magnetic drive, the rotor can be rotated to make the rotor through hole communicate with the ball through hole of the box or not communicate (that is, cut off), so that the rotation of the rotor can be controlled. Performs stop and pass functions for a single row of spherical elements.

Similar to the electric ball valve in the prior art, the parts of the device of the present invention corresponding to the valve seat, the valve core and the electric device are the casing, the rotor and the driving part respectively. However, the electric ball valve is mainly suitable for the on-off of liquid and gaseous media, and its internal seals, such as stem packing, valve seat seal, ball seal, etc., are limited in temperature and radiation resistance, and their operating life is closely related to the number of valve switches. Related, usually nuclear power valves are 2000 to 5000 times. However, the main function of the ball stopper invented by the present technology is to stop and conduct a series of single-row spherical elements. There is no requirement for internal sealing, and the wear of the rotor is not considered. It is controlled by a servo system and can meet tens of thousands of frequent starts and stops. It can meet the requirements of long life and reliable operation under strong gamma ray irradiation dose.

Specifically, in the high-temperature gas-cooled reactor ball stopper provided by the technical solution of the present invention, other components except the servo system are mainly made of metal materials, and the rare earth permanent magnet materials in the magnetic drive have also been irradiated The test can meet the requirements of the operating environment.

However, due to the presence of non-metallic materials such as wires, insulating paint, grease, and electrical connectors, it is difficult for the servo system to withstand a high gamma radiation dose of more than 10 ³ Gy, and the temperature resistance is also limited. To deal with this problem, the present invention provides a shield, which can effectively reduce the irradiation damage of the servo system from the gamma rays from the fuel element and ensure its service life.

On the other hand, the ball stopper of the present invention is provided with a special flange with heat dissipation fins, which can freely set the heat dissipation structure, is convenient in processing, manufacturing and installation, low in cost, and has a good heat dissipation effect, which can effectively protect the servo system from The thermal effect of the waste heat of the fuel element; and the existing technical scheme often arranges the heat sink on the isolation cover of the magnetic drive. Since the pressure bearing function of the isolation cover is firstly guaranteed, the isolation cover adopts a thin-walled TC4 titanium alloy with small eddy current loss. The number and size of the heat dissipation fins provided on it are limited, the processing is difficult, the manufacturing cost is high, and the heat dissipation effect is limited, which leads to the long-term operation of the magnetic drive and the servo system at a certain temperature, which affects the performance and life of both.

Moreover, the high-temperature gas-cooled reactor ball stopper of the present invention is configured with double bearings, placed on both sides of the rotor, and installed in the box. Compared with the cantilever rotor in the prior art, the load-bearing condition is better and the operation is more efficient. smooth.

Of course, implementing any product or method of the present invention does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a cutaway front view of the structure of the high temperature gas-cooled reactor ball stopper involved in one embodiment of the present invention;

Fig. 2 is a partial cut-away detailed view of the high temperature gas-cooled reactor ball stopper body structure involved in an embodiment of the present invention;

Fig. 3 is a cutaway side view of the high temperature gas-cooled reactor ball stopper structure involved in one embodiment of the present invention;

Among them, 1: Power components; 2: Coupling assembly; 3: Magnetic drive;

4: rotor assembly; 5: middle flange; 6: box assembly; 7: servo system;

8: coupling; 9: external magnetic assembly; 10: bracket; 11: internal magnetic assembly;

12: isolation cover; 13: counterbore of rotor; 14: goal through hole; 15: goal tube;

16: Box; 17: Drum; 18: Bearing; 19: Exit tube; 20: Goal channel;

21: rotor through hole; 22: ball outlet channel; 23: ball outlet through hole; 24: first seal;

25: the first sealing lip edge; 26: the first set of fasteners; 27: cooling fins;

28: second sealing lip edge; 29: second seal; 30: second set of fasteners;

31: rotating shaft; 32: shielding.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The embodiment of the present invention proposes a ball stopper applied to a high-temperature gas-cooled reactor. Referring to FIGS. The driver 3 , the rotor assembly 4 , the middle flange 5 , the box assembly 6 and the shield 32 .

The casing assembly 6 includes a casing with a goal through hole 20, a ball discharge through hole 22 (collectively referred to as a ball through hole) and a rotor counterbore 13 on the surface, as well as a goal tube 15 welded with the casing 16 and a discharge hole. The ball tube 19; the goal through hole 20, the ball exit through hole 22, the goal pipe 15 and the ball exit pipe 19 are coaxial and equal in diameter, and are perpendicular to the counterbore 13 of the rotor.

The rotor assembly includes a bearing 18 and a rotor (including a rotating drum 17 and a rotating shaft 31). The rotating drum 17 of the rotor is supported in the rotor counterbore 13 of the casing 16 through the bearing 18, and is connected with the inner magnetic assembly 11 of the magnetic drive 3 Connected; the drum 17 of the rotor has a rotor through hole 21, and the diameter of the rotor through hole 21 is the same as that of the ball through hole (goal through hole 20 and ball out through hole 22), the goal tube 15 and the ball out tube 19 are equal in diameter and larger than the diameter of the spherical element.

The inner diameter of the goal tube 15, the inner diameter of the ball outlet tube 19, the diameter of the goal through hole 20, the ball outlet through hole 22 and the rotor through hole 21 are Φ65mm, which is slightly larger than the diameter of the spherical element Φ60mm. On the vertical or inclined ball passage with an inner diameter of Φ65mm, the spherical element can use its favorable geometry and its own gravity to flow in each channel and into and out of the ball pipe without jamming.

The ball stopper also includes a middle flange 5 and a shield 32, through the heat dissipation fins 27 provided on the middle flange 5, the waste heat of the spherical element in the ball stopper can be effectively dissipated, and there is enough wall The thick and long middle flange cylinder can serve as axial shielding, together with the shielding 32 used as radial shielding, it can jointly realize the shielding of the power part 1 located in the shielding 32 and outside the magnetic drive 3, and protect the shielding The system is protected from excessive gamma ray irradiation to ensure the operating life of the power unit 1 .

The isolation cover 12 of the magnetic driver 3, the middle flange 5 and the box body 16 of the box assembly 6 form a helium airtight space. In order to realize the reliable sealing of the highly permeable helium, the middle flange One end of 5 is connected with the box body 16 of the box assembly 6 through the first set of fasteners 26 and the first seal 24, and the other end is passed through the bracket 10 of the magnetic drive 3 by means of the second set of fasteners 30. Compress the isolation cover 12 of the magnetic driver 3, and utilize the second sealing member 29 to realize the outer sealing of the helium medium. In addition, the two ends of the middle flange 5 can also pass the first sealing lip 25 and the second sealing lip respectively. The second sealing welding lip 28 implements sealing welding to ensure the zero-leakage sealing of the helium space.

The output shaft of the power component 1 is connected to the outer magnetic rotor 9 of the magnetic drive 3 through the coupling assembly 2, while the inner magnetic assembly (inner rotor) 11 of the magnetic drive 3 is connected to the rotor through a spline The rotating shaft 31 of the assembly 4 is connected. Since the drum 17 of the rotor assembly 4 is straddled in the rotor counterbore 13 of the box body 16 through the bearings 18 on both sides, the bearings are made of heat-resistant and wear-resistant alloy bearings. Simple.

Different from the electric ball valve which mainly performs the conduction and sealing cut-off functions of the fluid medium, the ball stopper only performs the conduction and stoppage function of the ball flow, but does not perform the seal cutoff function, so the torque of the ball stopper is small, so that the power Part 1 can use a servo motor with a high-precision resolver and a planetary gear reducer with high resolution. It not only has a compact structure, but also has reliable control, and can be started and stopped frequently to meet the requirements of long-life operation. On the other hand, due to the use of the magnetic drive, under the physical isolation of the isolation cover, the non-contact flexible transmission from the power part 1 to the rotor assembly 4 is realized, which avoids the problem of dynamic seal leakage, and can pass through the internal and external magnetic components. Overload slippage protects the servo system from overload shocks.

The ball stopper is in a normally closed state, that is, the rotor through hole 21 of the rotor assembly 4 is usually in the state of cutting off the ball flow pipeline, and the spherical element from the upstream pipeline reaches the drum 17 and is stopped by the drum. At this time, under the command of the main control system, the power part 1 drives the outer magnetic assembly 9 of the magnetic drive 3 to rotate 90°, and under the action of magnetic coupling, drives the inner magnetic assembly 11 and the rotating shaft 31 connected thereto to rotate 90°, The drum 17 is also rotated by 90°, so that the rotor through hole 21 is in the conduction position of the ball flow pipeline, so that the single or serial spherical elements originally stopped on the drum pass through the ball stop smoothly under the action of gravity.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. a trapping device that is applied to high temperature gas cooled reactor, is characterized in that, described trapping device comprises box assembly, power part, magnetic driver, rotor assembly and shielding, wherein:

Box assembly comprises that surface is with the casing of crossing ball through hole and rotor counterbore, and with the goal tube of described welding box body with go out bulb, describedly crosses ball through hole, goal tube and go out bulb coaxially isometrical, and its axis is vertical with the axis of described rotor counterbore;

Magnetic driver comprises interior magnetic assembly, cage, outer magnetic assembly and support, and described support compresses cage by first group of securing member and the first seal, and is connected with box assembly;

Rotor assembly comprises bearing and rotor, and described rotor, and is connected with the interior magnetic assembly of magnetic driver by bearings in the rotor counterbore of casing; Rotor is with the axis rotor through hole vertical with the axis of crossing ball through hole, the diameter of described rotor through hole with cross ball through hole, goal tube and go out the equal diameters of bulb, and be greater than the diameter of ball type device;

Described shielding is connected with the support of magnetic driver, and described power part is placed in shielding, and is connected with the support of magnetic driver by coupling assembly.

2. trapping device according to claim 1, it is characterized in that, described trapping device also comprises a middle flange that is provided with radiating fin and through hole, and described middle flange two ends are connected with magnetic driver with box assembly respectively with seal by securing member, and the rotating shaft of rotor is through middle flange through hole.

3. trapping device according to claim 1, is characterized in that, described rotor through hole, the diameter crossing ball through hole, goal tube and go out bulb are within the scope of 62-65mm.

4. trapping device according to claim 1, is characterized in that, described power part is comprised of the AC servo motor with rotary transformer and planet-gear speed reducer.

5. trapping device according to claim 1, is characterized in that, described bearing is heat-resistance abrasion-resistance alloy bearing.

6. trapping device according to claim 1, is characterized in that, described bearing has two, and is installed on respectively the rotor both sides in casing.

7. trapping device according to claim 1, is characterized in that, the magnetic material in described magnetic driver adopts rare earth permanent-magnetic material.

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