CN115274145A - Parallel drive control rod drive mechanism for a reactor - Google Patents

Parallel drive control rod drive mechanism for a reactor Download PDF

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Publication number
CN115274145A
CN115274145A CN202210911196.4A CN202210911196A CN115274145A CN 115274145 A CN115274145 A CN 115274145A CN 202210911196 A CN202210911196 A CN 202210911196A CN 115274145 A CN115274145 A CN 115274145A
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China
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assembly
control rod
parallel
transmission
reactor
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CN202210911196.4A
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Chinese (zh)
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不公告发明人
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Anhui Zhongke Chaohe Technology Co ltd
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Anhui Zhongke Chaohe Technology Co ltd
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Priority to CN202210911196.4A priority Critical patent/CN115274145A/en
Publication of CN115274145A publication Critical patent/CN115274145A/en
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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
    • G21C7/12—Means for moving control elements to desired position
    • 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
    • G21C7/12—Means for moving control elements to desired position
    • G21C7/14—Mechanical drive arrangements
    • 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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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The invention relates to the technical field of reactors, in particular to a parallel transmission control rod driving mechanism for a reactor, and aims to solve the problem that the axial size of the control rod driving mechanism of the existing reactor is large. To this end, the parallel drive control rod drive mechanism of the present invention comprises: the three-level nesting assembly comprises a rotating part, a transmission part and a gripper driving rod, wherein the projections of the rotating part, the transmission part and the gripper driving rod are at least partially overlapped on the longitudinal section, and the rotating part is connected with the gripper driving rod in a matching way; the first parallel transmission assembly is used for driving the hand grab and the control rod assembly to move in the guide tube; the second parallel transmission assembly is used for driving the rotating piece to rotate and realizing the opening and closing control of the hand grip. The parallel transmission control rod driving mechanism utilizes the three-level nested assembly and the transmission assembly arranged in parallel, can effectively reduce the axial size of the control rod driving mechanism, and is beneficial to the miniaturization development of a reactor.

Description

Parallel drive control rod drive mechanism for a reactor
Technical Field
The invention relates to the technical field of reactors, and particularly provides a parallel transmission control rod driving mechanism for a reactor.
Background
The control rod driving mechanism is a key device for realizing effective control of reactivity and safe operation of a reactor, and the reactivity control is generally realized by lifting or inserting a control rod assembly downwards. And under the condition of shutdown accident, releasing the control rod assembly, and enabling the control rod assembly to quickly fall into the reactor core under the action of gravity to realize emergency shutdown.
At present, a control rod driving mechanism generally adopts the modes of magnetic lifting, motor driving and the like. For example, a control rod driving mechanism for stepping magnetic lifting is generally adopted in a commercial pressurized water reactor, a loop power supply controller is used for energizing and de-energizing a coil assembly (a holding coil, a transfer coil and a lifting coil) according to a design program, and magnetic force and a claw are used for driving a driving rod to drive the control rod assembly to step up or down. For another example, a liquid metal reactor mainly uses a motor-driven control rod driving mechanism, for example, a motor is driven to cooperate with a rack-and-pinion transmission, so as to drive the control rod assembly to lift or lower.
However, in the process of driving the control rod assembly to move, the axial dimension of the driving mechanism is larger, the overall height of the reactor is increased, and the miniaturization development of the reactor is seriously restricted.
Disclosure of Invention
The invention aims to solve the technical problem that the existing control rod has no self-locking function in the using process.
The present invention provides a parallel transmission control rod drive mechanism for a small reactor for controlling the movement of a gripper and a control rod assembly within a guide tube, the gripper being for gripping or releasing the control rod assembly, wherein the parallel transmission control rod drive mechanism comprises:
the three-level nesting assembly comprises a rotating part, a transmission part and a gripper driving rod, a plane perpendicular to a horizontal plane is taken as a longitudinal section, at least parts of projections of the rotating part, the transmission part and the gripper driving rod on the longitudinal section are overlapped, the rotating part is in adaptive connection with the gripper driving rod, and the transmission part and the gripper driving rod are arranged at intervals;
the first parallel transmission assembly is arranged beside one side of the three-level nested assembly, and one end of the first parallel transmission assembly is connected with the transmission part and is used for driving the hand grip and the control rod assembly to move in the guide tube;
and one end of the second parallel transmission assembly is connected with the rotating piece and used for driving the rotating piece to rotate and realizing the opening and closing control of the hand grip.
In the above preferred technical solution of the parallel transmission control rod drive mechanism for a small reactor, the rotating member includes a sleeve having an opening at the bottom, the inner wall of the sleeve has a slide rail groove, and one end of the gripper drive rod passes through the opening and is connected to the slide rail groove in a fitting manner;
at least part of the transmission piece penetrates through the opening and extends into the sleeve, and a preset distance is reserved between the transmission piece positioned in the sleeve and the inner wall of the sleeve.
In the above preferred embodiment of the parallel transmission control rod drive mechanism for a small reactor, the transmission member includes a first gear and a rack engaged with the first gear;
the first gear is rotatably connected with the first parallel transmission assembly, and at least part of the rack is inserted into the rotating part, so that one end of the rack moves in the rotating part along the axial direction of the guide pipe under the driving of the first parallel transmission assembly.
In the above preferred embodiment of the parallel transmission control rod drive mechanism for a small reactor, the first parallel transmission assembly includes a first motor and a first gear pair;
the output shaft end of the first motor is connected with a first speed reducer, and the output shaft end of the first speed reducer is connected with the first gear pair;
the output shaft end of the first gear pair is in transmission connection with the first gear;
the height of the horizontal position where the highest point of the first motor is located is lower than that of the horizontal position where the rack is located when the highest point is located.
In the above preferred technical solution of the parallel transmission control rod drive mechanism for a small reactor, the parallel transmission control rod drive mechanism further comprises a rod position measuring assembly disposed on the first gear pair to measure the displacement of the control rod assembly by the rotation angle of the transmission gear in the first gear pair.
In the above preferred solution of the parallel transmission control rod drive mechanism for a small reactor, the second parallel transmission assembly includes a second motor and a second gear pair:
the output shaft end of the second motor is connected with a second speed reducer, and the output shaft end of the second speed reducer is connected with the second gear pair;
the output shaft end of the second gear pair is connected with the rotating piece;
the height of the horizontal position where the highest point of the second motor is located is lower than that of the horizontal position where the rack is located when the highest point is located.
In the above preferred technical solution of the parallel transmission control rod drive mechanism for small reactor, the first motor and the second motor both adopt 10-proof7And the irradiation resisting motor is used for resisting the irradiation dose of the gray.
In the above preferred technical solution of the parallel transmission control rod drive mechanism for a compact reactor, the parallel transmission control rod drive mechanism further comprises a counterweight, and the counterweight is disposed on the gripper drive rod, the transmission member and the control rod assembly, wherein the counterweight is a heavy metal structural member having a density greater than that of the coolant in the guide tube, so that the total gravity of the gripper drive rod, the transmission member, the gripper and the control rod assembly is greater than the buoyancy generated by the coolant.
In the above preferred technical solution of the parallel transmission control rod drive mechanism for a small reactor, the parallel transmission control rod drive mechanism further comprises a shielding layer, and the shielding layer is arranged above the guide tubes and covers the part of the tertiary nested assembly exposed to the outside.
In the above preferred technical solution of the parallel transmission control rod drive mechanism for a small reactor, the parallel transmission control rod drive mechanism further includes a self-locking assembly, and the self-locking assembly is configured to disconnect control between the first parallel transmission assembly and the transmission member in an accident state, so as to achieve rapid falling and reverse self-locking of the control rod assembly.
Under the condition of adopting the technical scheme, the parallel transmission control rod driving mechanism is provided with a first parallel transmission assembly and a second parallel transmission assembly which are arranged beside the guide pipe, wherein the first parallel transmission assembly is used for driving the hand grip and the control rod assembly to do linear motion in the vertical direction in the guide pipe, and the second parallel transmission assembly is used for driving the rotating part to rotate and realizing the opening and closing control of the hand grip. Meanwhile, the nesting form of the three-level nesting assembly is matched, so that the axial size of the control rod driving mechanism is effectively reduced, and the miniaturization development of the reactor is facilitated.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a parallel drive control rod drive mechanism for a small reactor, according to an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating the construction of a transmission in a parallel drive control rod drive mechanism for a small reactor according to an exemplary embodiment.
Description of reference numerals:
1. a third-level nested component; 11. a rotating member; 12. a transmission member; 13. a gripper driving rod; 121. a first gear; 122. a rack;
2. a first parallel drive assembly; 21. a first motor; 22. a first gear pair; 23. a first decelerator;
3. a second parallel drive assembly; 31. a second motor; 32. a second gear pair; 33. a second decelerator;
4. a rod position measuring assembly; 5. a shielding layer; 6. a self-locking assembly; 10. a guide tube; 20. a gripper; 30. a control rod assembly.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
As shown in fig. 1, an exemplary embodiment of the present invention provides a parallel transmission control rod drive mechanism for a small reactor for controlling the movement of a hand grip 20 and control rod assemblies 30 within a guide tube 10, wherein the hand grip 20 is used to grip or release the control rod assemblies 30. The parallel transmission control rod driving mechanism for the small reactor comprises a three-stage nested assembly 1, a first parallel transmission assembly 2 and a second parallel transmission assembly 3.
Referring to FIG. 1, the guide tube 10 is internally constructed in a hollow structure having a passage defined therein for the hand grip 20 and the control rod assemblies 30 to pass through.
The part of the three-stage nested assembly 1 is positioned in the guide pipe 10, and particularly, the lower half part of the three-stage nested assembly 1 extends into the guide pipe 10. Wherein, the three-stage nested assembly 1 extending into the guide pipe 10 is arranged at a preset distance from the inner wall of the guide pipe 10, and the preset distance ranges from 0.5mm to 2mm, so that the three-stage nested assembly 1 can move in the guide pipe 10 along the vertical direction.
Referring to fig. 1 in conjunction with fig. 2, the tertiary nest assembly 1 includes a rotating member 11, a transmission member 12, and a gripper driving lever 13. The plane perpendicular to the horizontal plane is taken as a longitudinal section, and the projections of the rotating piece 11, the transmission piece 12 and the gripper driving rod 13 on the longitudinal section are at least partially overlapped. The lower end of the rotation member 11 may be fastened to the top of the driving member 12 and the top of the gripper driving lever 13 in the vertical direction. The rotating member 11 has an accommodating space therein, and the bottom of the accommodating space has an opening. The top of the transmission member 12 passes through the opening and extends into the accommodating space, and the top of the transmission member 12 can move in the accommodating space along the vertical direction. Wherein the transmission 12 may be connected to the hand grip 20 or the control rod assembly 30 such that movement of the transmission 12 drives movement of the control rod assembly 30 and the hand grip 20.
The rotating member 11 is connected to the gripper driving rod 13 in an adaptive manner, for example, the gripper driving rod 13 may slide along an axial direction of the rotating member 11, and the rotating member 11 may drive the gripper driving rod 13 to rotate along a radial direction. The gripper driving lever 13 is connected to the gripper 20. For example, the top of the gripper driving rod 13 is threadedly coupled to the inside of the rotating member 11 to convert the rotation of the rotating member 11 into the vertical movement of the gripper driving rod 13, thereby performing the opening and closing operation of the gripper and finally performing the gripping or releasing of the control rod assembly 30 by the gripper. It should be noted that the opening and closing of the hand grip 20 by the hand grip driving lever 13 can be accomplished by the prior art, and the specific structure of the hand grip driving lever 13 and the hand grip 20 is not specifically described herein.
The gripper driving rod 13 is spaced apart from the transmission member 12, that is, there is no connection between the gripper driving rod 13 and the transmission member 12. In this example, the rotating member 11 is buckled on the top of part of the transmission member 12 and the top of the gripper driving rod 13, so as to form a three-level nesting structure, which can effectively reduce the axial dimension of the control rod driving assembly, thereby being beneficial to the miniaturization development of the reactor.
As described further with reference to fig. 1 and 2, the first parallel transmission assembly 2 is disposed beside the guide tube 10 in an axial direction (i.e., a vertical direction) of the guide tube, wherein one end of the first parallel transmission assembly 2 extends into the guide tube 10 and is connected to the transmission member 12 for driving the hand grip 20 and the control rod assembly 30 to linearly reciprocate in the vertical direction within the guide tube 10.
The side arrangement can be parallel side arrangement, vertical side arrangement or side arrangement with a preset angle. For example, the first parallel transmission assembly 2 and the guide tube 10 are parallel to each other, that is, the first parallel transmission assembly 2 is arranged in a vertical direction. Alternatively, the first parallel transmission assembly 2 is arranged in a horizontal direction, and one end of the first parallel transmission assembly 2 and the guide pipe 10 are disposed perpendicular to each other. Still alternatively, the axis of the first parallel transmission assembly 2 in the arrangement direction is at a predetermined angle with respect to the axis of the guide tube 10, that is, an extension line of the axis of the first parallel transmission assembly 2 in the arrangement direction passes through the axis of the guide tube 10, defining the arrangement direction of the guide tube 10 as the vertical direction, and the arrangement direction of the first parallel transmission assembly 2 is arranged in an obliquely upward direction or in an obliquely downward direction. In this example, the first parallel transmission assembly 2 is arranged along the vertical direction, so that the axial dimension of the driving mechanism is reduced, and the radial dimension of the driving mechanism is also reduced, thereby being beneficial to the miniaturization development of the reactor.
Continuing with reference to FIG. 1, the second parallel drive assembly 3 is positioned alongside the guide tube 10 in the axial direction of the guide tube (i.e., the vertical direction). One end of the second parallel transmission assembly 3 extends into the guide tube 10 and is connected with the rotating part 11, and the second parallel transmission assembly 3 is used for driving the rotating part 11 to rotate, so that the opening and closing control of the hand grip 20 is realized. Specifically, one end of the second parallel transmission assembly 3 extends into the guide tube 10 and then is connected with the top of the rotating member 11.
The side arrangement can be parallel side arrangement, vertical side arrangement or side arrangement with a preset angle. For example, the second parallel transmission assembly 3 and the guide tube 10 are parallel to each other, i.e., the second parallel transmission assembly 3 is arranged in a vertical direction. Alternatively, the second parallel transmission assembly 3 is arranged in a horizontal direction, and one end of the second parallel transmission assembly 3 is disposed perpendicular to the guide pipe 10. Still alternatively, the axis of the arrangement direction of the second parallel transmission assemblies 3 is at a predetermined angle with the axis of the guide pipe 10, that is, the extension line of the axis of the arrangement direction of the second parallel transmission assemblies 3 passes through the axis of the guide pipe 10, defining the arrangement direction of the guide pipe 10 as the vertical direction, and the arrangement direction of the second parallel transmission assemblies 2 is arranged in either an obliquely upward direction or an obliquely downward direction. In this example, the second parallel transmission assembly 3 is arranged in the horizontal direction to effectively reduce the axial dimension of the control rod drive mechanism, thereby facilitating the development of miniaturization of the reactor.
It should be noted that the second parallel transmission assembly 3 is located at a predetermined distance above the first parallel transmission assembly 2. Of course, the second parallel transmission assembly 3 may also be located on the other side of the guide tube 10 at the same position as the first parallel transmission assembly 2, or may also be located below the first parallel transmission assembly 2.
In this embodiment, the first parallel transmission assembly 2 and the second parallel transmission assembly 3 are disposed beside the guide tube 10, wherein the first parallel transmission assembly 2 is used for driving the hand grip 20 and the control rod assembly 30 to move linearly in the vertical direction inside the guide tube, and the second parallel transmission assembly 3 is used for driving the rotating member 11 to rotate and controlling the opening and closing of the hand grip 20. Meanwhile, the nesting form of the three-level nesting assembly 1 is matched, so that the axial size of the control rod driving mechanism is effectively reduced, and the miniaturization development of the reactor is facilitated.
Referring to fig. 1 and 2, in some embodiments, the rotating member 11 comprises a sleeve having an opening at the bottom. Wherein, the inner wall of the sleeve is provided with a slide rail groove (not shown in the figure), and one end (top end) of the gripper driving rod 13 passes through the opening and is connected with the slide rail groove in a matching way. In one example, the plurality of slide rail grooves may be arranged on the inner wall of the sleeve in a spiral line structure, and a plurality of slide rail protrusions (not shown in the figure) connected with the slide rail grooves in a one-to-one correspondence manner are arranged at the top of the gripper driving rod 13, so that the gripper driving rod 13 rotates by using the rotation of the sleeve, thereby controlling the opening and closing of the gripper 20, and simultaneously ensuring the free sliding of the gripper driving rod 13 in the vertical direction.
Wherein at least part of the transmission member 12 passes through the opening and extends into the sleeve, and the transmission member 12 positioned in the sleeve is spaced from the inner wall of the sleeve by a predetermined distance. It should be noted that the predetermined distance is in the range of 3mm to 5mm to ensure the smoothness of the movement of the transmission member 12 in the vertical direction in the sleeve.
In this embodiment, the sliding rail groove on the inner wall of the sleeve is connected with the gripper driving rod 13 in a matching manner, so that the rotation of the sleeve is finally converted into the opening and closing of the gripper 20, and the gripping or releasing of the control rod assembly 30 is completed. That is, a portion of the gripper driving lever 13 is accommodated in the sleeve. Meanwhile, at least part of the transmission part 12 is accommodated in the sleeve, so that a three-level nesting mode among the rotating part 11, the transmission part 12 and the gripper driving rod 13 is realized, the axial size of the control rod driving mechanism is effectively reduced, the axial size of the control rod driving mechanism is reduced, and the design of a miniature reactor with compact space size is suitable on the premise of realizing the safety function of the reactor, so that the miniaturization development of the reactor is facilitated.
It should be noted that, in one example, the rotating member 11 may also be a prism rod. Wherein, the lower half part of the prism rod is accommodated in the transmission member 12 to form a three-level nested structure. The cross-sectional shape of the prismatic rods may comprise a regular polygon. The prism pole is worn to locate in tongs actuating lever 13. Wherein, tongs actuating lever 13 inside cavity, and the cavity cross-sectional shape of tongs actuating lever 13 is unanimous with prismatic pole shape to through the rotation of second parallel transmission assembly 3, drive and rotate piece 11, and then drive the rotation of tongs actuating lever 13, thereby realize the control of opening and shutting of tongs 20, ensured the free slip of tongs actuating lever in the vertical direction simultaneously.
Referring to fig. 1, in some embodiments, the transmission member 12 includes a first gear 121 and a rack 122, and the first gear 121 is engaged with the rack 122.
The first gear 121 is rotatably connected to the first parallel transmission assembly 2, that is, an output shaft end of the first parallel transmission assembly 2 is connected to the first gear 121. At least a portion of the rack gear 122 is inserted into the rotating member 11 (which may include but is not limited to a sleeve), and a lower end of the rack gear 122 may be connected to the control rod assembly 30 such that one end of the rack gear 122 moves in the rotating member 11 in the axial direction of the guide tube 10 under the driving of the first parallel transmission assembly 2, thereby achieving the movement of the control rod assembly 30 in the vertical direction.
In this embodiment, the first gear 121 and the rack 122 are engaged to control the movement of the control rod assembly 30, and the control device has a simple structure and is convenient for accurately controlling the movement position of the control rod assembly 30.
Referring to fig. 1, in some embodiments, the first parallel transmission assembly 2 includes a first electric motor 21 and a first gear pair 22. An output shaft end of the first motor 21 is connected with a first speed reducer 23, and an output shaft end of the first speed reducer 23 is connected with the first gear pair 22. The first speed reducer 23 is configured to reduce the output rotation speed of the first motor 21 to a desired number of revolutions, obtain a large torque, and have a reverse self-locking function, so as to accurately control the rotation speed and the rotation process of the first gear pair 22.
While the output shaft end of the first gear pair 22 is in transmission connection with the first gear 121, the first gear pair 22 may include, but is not limited to, a bevel gear pair, and the bevel gear pair includes a driving bevel gear connected with the output shaft end of the first speed reducer 23 and a driven bevel gear engaged with the driving bevel gear. The output shaft end of the driven bevel gear of the first gear pair 22 is connected to one end of a transmission rod, and the other end of the transmission rod is connected to the first gear 121, so that the rotation of the first motor 21 is converted into the linear reciprocating motion of the rack 122.
It should be noted that the first motor 21 and the first speed reducer 23 are both arranged along the vertical direction, the bevel gear pair converts the rotation of the first motor 21 along the vertical direction into the rotation of the transmission rod along the horizontal direction, the transmission rod drives the first gear 121 to rotate, and the rotation of the first gear 121 further drives the rack 122 to move. When the first motor 21 rotates in the forward or reverse direction, the rack 122 is linearly reciprocated in the vertical direction.
In this embodiment, the first motor 21, the first reducer 23, the first gear pair 22, the transmission rod, the transmission member 12, the gripper 20, and the control rod assembly 30 are sequentially connected to form a main transmission line. With reference to fig. 1, the height of the highest point of the first motor 21 is lower than the height of the horizontal position of the rack 122 when the highest point is located, so that a parallel transmission structure is formed by the first parallel transmission assembly 2 and by means of gear conversion, and the axial size of the control rod driving mechanism is effectively reduced.
Referring to FIG. 1, in some embodiments, the parallel drive control rod drive mechanism further includes a rod position measurement assembly 4. The rod position measuring assembly 4 is provided on the first gear pair 22 to measure the displacement of the control rod assembly 30 by the rotational angle of the drive gear in the first gear pair.
Wherein the rod position measuring assembly 4 may include an angle measuring instrument to directly measure the rotation angle of the driven bevel gear or the drive bevel gear in the first gear pair 22 using the angle measuring instrument to derive the displacement of the control rod assembly 30.
Or the rod position measuring assembly 4 may include a chain or a measuring rack engaged with the driven bevel gear or the drive bevel gear in the first gear pair 22, so that the rotation angle of the driven bevel gear or the drive bevel gear is measured by the transmission distance of the chain or according to the moving distance of the measuring gear, and finally the displacement of the control rod assembly 30 is derived and determined by the transmission ratio or the tooth speed ratio of the driven bevel gear and the first gear 121 and the rack 122.
In this embodiment, the rod position measuring assembly 4 can be used to precisely control the relative position of the control rod assembly 30, thereby effectively improving the control effect of the control rod assembly 30.
Referring to fig. 1, in some embodiments, the second parallel transmission assembly 3 reports a second electric machine 31 and a second gear set 32. An output shaft end of the second motor 31 is connected with a second speed reducer 33, and an output shaft end of the second speed reducer 33 is connected with the second gear pair 32. The second reducer 33 is used to reduce the output rotation speed of the second motor 31 to a desired number of revolutions, obtain a large torque, and have a reverse self-locking function, so as to accurately control the rotation speed and the rotation process of the second gear pair 32.
The output shaft end of the second gear pair 32 is connected to the rotating member 11 to realize the rotation of the rotating member 11 by the rotation of the second motor 31. The second gear pair 32 may include, but is not limited to, a cylindrical gear pair, a bevel gear pair, or a worm gear pair.
It should be noted that, the second motor 31 and the second speed reducer 33 are both arranged along the horizontal direction, the second gear pair 32 converts the rotation of the second motor 31 along the first horizontal position into the rotation along the second horizontal position, and the output shaft end of the second gear pair 32 drives the rotating member 11 to rotate. When the second motor 31 rotates forward or backward, the gripper driving lever 13 rotates and moves vertically with respect to the rack 122, so that the open/close state of the gripper 20 is controlled by the movement of the gripper driving lever 13.
In this embodiment, the second motor 31, the second reducer 33, the second gear pair 32, the rotating member 11, the gripper driving rod 13, and the gripper 20 are sequentially connected to each other, so that the gripper 20 grips or releases the control rod assembly 30, and a transmission path for gripping or releasing the control rod assembly 30 is formed. With reference to fig. 1, the height of the highest point of the second motor 31 is lower than the height of the horizontal position of the rack 122 at the highest point, so that a parallel transmission structure is formed by the second parallel transmission assembly 3 and the gear conversion, and the axial size of the control rod driving mechanism is effectively reduced.
Referring to FIG. 1, in some embodiments, both first motor 21 and second motor 31 employ a reactance 107The Gray radiation dose resistant motor is used for improving the radiation resistance of the first motor 21 and the second motor 31, and further improving the service cycle.
Referring to FIG. 1, in some embodiments, the parallel drive control rod drive mechanism further comprises a counterweight (not shown). Wherein the weight is arranged on the gripper driving rod 13, the rack 122 in the transmission 12 and the control rod assembly 30. The counterweight is a heavy metal structural member with density greater than that of the coolant in the guide tube 10, and tungsten metal can be selected as the counterweight material according to the type of the coolant, or other heavy metal materials can be selected according to the actual type of the coolant, so that the total gravity of the gripper driving rod 13, the rack 122, the gripper 20 and the control rod assembly 30 is greater than the buoyancy generated by the coolant.
Referring to FIG. 1, in some embodiments, the parallel drive control rod drive mechanism further comprises a shield 5. The shielding layer 5 is arranged above the guide tube 10 and covers the part of the tertiary nested assembly 1 exposed to the outside. It should be noted that the shielding layer 5 occupies the gap position between the reactor electrical equipment, the three-stage nested assembly 1, the first parallel transmission assembly 2 and the third parallel transmission assembly 3 during the installation process, so as to effectively ensure the radiation resistance of the electrical equipment in the reactor. The shielding layer 5 may also be disposed outside the rotating member 11 and the rack 122, or, according to actual conditions, the shielding layer 5 is directly covered on the first motor 21, the first speed reducer 23, the second motor 31, and the rod position measuring assembly 4. The thickness of the shield 5 may be determined from calculations of neutron flux within the reactor.
Referring to FIG. 1, in some embodiments, the parallel drive control rod drive mechanism further comprises a self-locking assembly 6. The self-locking assembly 6 is used for disconnecting the control between the first parallel transmission assembly 2 and the transmission part 12 in an accident state so as to realize quick falling and reverse self-locking of the control rod assembly 30, specifically, in the accident state, after the self-locking assembly 6 disconnects the control between the first parallel transmission assembly 2 and the transmission part 12, under the action of gravity, the gripper driving part 13, the rack 122, the gripper 20 and the control rod assembly 30 fall rapidly, and meanwhile, the self-locking assembly 6 is utilized to enable the control rod assembly 30 to be reversely self-locked, so that the rod is prevented from being ejected, and the functions of releasing the rod in the accident and self-locking in the accident are realized.
The self-locking assembly 6 may include an electromagnetic clutch and a self-locking structure, the self-locking structure includes but is not limited to an overrunning clutch, the self-locking structure may also adopt an anti-bounce device in patent number CN114093530a (name: anti-bounce device of compensation adjusting rod driving mechanism), and the specific structure of the anti-bounce device is not described herein.
In the embodiment, the self-locking assembly 6 can be used for disconnecting the transmission connection in an accident state, for example, the first speed reducer 23 and the first gear pair 22, so that the control rod assembly 30 can be ensured to rapidly fall and stop the reactor, meanwhile, the rod ejection can be prevented, the accident rod release (releasing the control rod assembly 30) and the accident self-locking function are realized, and the reactor stopping safety is ensured.
The operation of the parallel transmission control rod drive mechanism for a small reactor according to the present invention will be described in detail with reference to fig. 1 and 2:
the working state of the control rod driving mechanism is divided into a normal working state, a rod dropping shutdown state, an installation and maintenance state and the like.
And (3) normal working state: the second motor 31 drives the rotating member 11 to rotate through the second speed reducer 33 and the second gear pair 32, and drives the gripper driving rod 13 to rotate and move in the vertical direction relative to the rack 122, so as to press the gripper 20 to grip the control rod assembly 30. The first motor 21 drives the control rod assembly 30 to move up and down at a designed rate through the first speed reducer 23, the first gear pair 22 and the transmission member 12. The rod position measurement assembly 4 reacts to the rod position of the control rod assembly 30 in real time during operation of the control rod assembly 30.
A rod dropping shutdown state: taking the self-locking assembly 6 as an electromagnetic clutch and a self-locking structure as an example, the electromagnetic clutch is powered off, and the control rod assembly 30, the gripper 20, the rack 122 and the gripper driving rod 13 rapidly drop and stop under the action of self gravity. Meanwhile, the reverse self-locking function of the self-locking assembly 6 is utilized to prevent the rod from being bounced.
Installation and maintenance: the second motor 31 drives the rotating member 11 to rotate, and drives the handle driving rod 13 to rotate relative to the rack 122, so that the handle 20 is in an open state, the control rod assembly 30 stands by itself in the core active region, the control rod assembly 30 is separated from the upper end structure, and then the upper end structure can be installed and overhauled or the control rod assembly 30 can be reloaded by using a reloading mechanism.
In the parallel transmission control rod assembly driving mechanism of the embodiment, the axial size of the control rod driving mechanism is effectively reduced through the parallel transmission of the first parallel transmission assembly 2 and the second parallel transmission assembly 3 and the structural mode of the three-stage nested assembly. Meanwhile, the shielding layer 5 is arranged, so that the problem of irradiation resistance of electrical equipment caused by reduction of the axial size of the control rod driving mechanism is solved, miniaturization development of a reactor is facilitated, and the safe operation coefficient of the control rod driving mechanism is effectively improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A parallel transmission control rod drive mechanism for a reactor for controlling movement of a gripper and a control rod assembly within a guide tube of the reactor, the gripper for gripping or releasing the control rod assembly, the parallel transmission control rod drive mechanism comprising:
the three-level nesting assembly comprises a rotating piece, a transmission piece and a gripper driving rod, wherein the projections of the rotating piece, the transmission piece and the gripper driving rod on the longitudinal section perpendicular to the horizontal plane are at least partially overlapped, the rotating piece is in adaptive connection with the gripper driving rod, and the transmission piece and the gripper driving rod are arranged at intervals;
the first parallel transmission assembly is arranged beside one side of the three-level nested assembly, and one end of the first parallel transmission assembly is connected with the transmission part and is used for driving the hand grip and the control rod assembly to move in the guide tube;
and one end of the second parallel transmission assembly is connected with the rotating piece and used for driving the rotating piece to rotate and realizing the opening and closing control of the hand grip.
2. The parallel transmission control rod drive mechanism for a reactor as set forth in claim 1, wherein the rotating member includes a sleeve having an opening at a bottom thereof, the sleeve having a slide groove on an inner wall thereof, one end of the gripper driving rod passing through the opening and being fittingly coupled to the slide groove;
at least part of the transmission piece penetrates through the opening and extends into the sleeve, and a preset distance is reserved between the transmission piece positioned in the sleeve and the inner wall of the sleeve.
3. The parallel drive control rod drive mechanism for a reactor of claim 2 wherein the drive comprises a first gear and a rack engaged with the first gear;
the first gear is rotatably connected with the first parallel transmission assembly, and at least part of the rack is inserted into the rotating part, so that one end of the rack moves in the rotating part along the axial direction of the guide pipe under the driving of the first parallel transmission assembly.
4. The parallel drive control rod drive mechanism for a reactor of claim 3 wherein the first parallel drive assembly comprises a first motor and a first gear pair;
the output shaft end of the first motor is connected with a first speed reducer, and the output shaft end of the first speed reducer is connected with the first gear pair;
the output shaft end of the first gear pair is in transmission connection with the first gear;
the height of the horizontal position where the highest point of the first motor is located is lower than that of the horizontal position where the rack is located when the highest point is located.
5. The parallel drive control rod drive mechanism for a reactor of claim 4 further comprising a rod position measurement assembly disposed on the first gear set to measure displacement of the control rod assembly by the angle of rotation of a drive gear in the first gear set.
6. The parallel drive control rod drive mechanism for a reactor of claim 4 wherein the second parallel drive assembly comprises a second motor and a second gear set;
the output shaft end of the second motor is connected with a second speed reducer, and the output shaft end of the second speed reducer is connected with the second gear pair;
the output shaft end of the second gear pair is connected with the rotating piece;
the height of the horizontal position where the highest point of the second motor is located is lower than that of the horizontal position where the rack is located when the highest point is located.
7. The parallel drive control rod drive mechanism for a reactor of claim 6 wherein the first motor and the second motor each employ a reactance of 107And the irradiation resisting motor is used for resisting the irradiation dose of the gray.
8. The parallel transmission control rod drive mechanism for a reactor as set forth in any one of claims 1 to 7, further comprising a counterweight disposed on the gripper drive rod, the transmission member, and the control rod assembly, wherein the counterweight is a heavy metal structure having a density greater than a density of coolant within the guide tube such that a total weight of the gripper drive rod, the transmission member, the gripper, and the control rod assembly is greater than a buoyancy force generated by the coolant.
9. The parallel transmission control rod drive mechanism for a reactor as set forth in any one of claims 1 to 7, further comprising a shield disposed over the guide tube and shrouding the externally exposed portion of the tertiary nest assembly.
10. The parallel drive control rod drive mechanism for a reactor of any one of claims 1 to 7, further comprising a self-locking assembly for disconnecting control between the first parallel drive assembly and the drive to achieve rapid fall and reverse self-locking of the control rod assembly in an accident situation.
CN202210911196.4A 2022-07-29 2022-07-29 Parallel drive control rod drive mechanism for a reactor Pending CN115274145A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115841881A (en) * 2022-11-30 2023-03-24 中国原子能科学研究院 Reactor control rod drive mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115841881A (en) * 2022-11-30 2023-03-24 中国原子能科学研究院 Reactor control rod drive mechanism
CN115841881B (en) * 2022-11-30 2024-05-31 中国原子能科学研究院 Reactor control rod driving mechanism

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