A control rod drive mechanism with rapid response and a nuclear reaction device

Abstract

Embodiments of the present invention provide a control rod drive mechanism with fast response and a nuclear reaction device, relating to the field of nuclear power equipment. The control rod drive mechanism with fast response includes a mounting assembly, a guiding assembly, a driving assembly, and a control rod mounting seat. The control rod mounting seat is configured to mount the control rod of the nuclear reactor. The control rod mounting seat is installed at the bottom end of the guiding assembly. The guiding assembly is installed on the mounting assembly and can move relative to the mounting assembly. The driving assembly is arranged on the mounting assembly and is in transmission connection with the control rod mounting seat. The driving assembly can drive the control rod mounting seat to rise or fall, and the driving assembly can also release the restriction to enable the control rod mounting seat and the guiding assembly to fall under the action of gravity. It can improve the response efficiency during reactor shutdown and has a simpler structure.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power equipment, and in particular, to a control rod drive mechanism with rapid response and a nuclear reaction device. Background Art

[0002] Control rods in a nuclear reactor are key components used to regulate and control the rate of the chain fission reaction, ensuring the safe and stable operation of the reactor. The main function of the control rod is to control the intensity of the nuclear reaction by absorbing neutrons, thereby regulating the power output of the reactor. When the reactor starts up, the control rods are usually in a fully inserted state to prevent the occurrence of a chain reaction. When ready to start, the control rods are gradually withdrawn, allowing more neutrons to participate in the fission reaction, so that the reactor gradually reaches the critical state and starts to generate electricity. When it is necessary to stop the reactor, the control rods are quickly inserted into the reactor core, absorbing a large number of neutrons and quickly stopping the chain reaction. This process is also called an emergency shutdown, which is usually used in the event of abnormal or emergency situations.

[0003] The control rod drive device is the main structure for installing the control rod and adjusting the insertion and extraction of the control rod. The existing control rod drive device has a complex structure and a slow response during an emergency shutdown, and cannot meet the current response requirements for an emergency shutdown. Summary of the Invention

[0004] The objectives of the present invention include providing a control rod drive mechanism with rapid response and a nuclear reaction device, which can improve the response efficiency during shutdown and has a simpler structure.

[0005] Embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a control rod drive mechanism with rapid response, including a mounting assembly, a guiding assembly, a driving assembly, and a control rod mounting seat;

[0007] The control rod mounting seat is configured to mount the control rod of the nuclear reactor;

[0008] The control rod mounting seat is mounted at the bottom end of the guiding assembly;

[0009] The guiding assembly is mounted on the mounting assembly and can move relative to the mounting assembly;

[0010] The driving assembly is arranged on the mounting assembly and is in transmission connection with the control rod mounting seat. The driving assembly can drive the control rod mounting seat to rise or fall, and the driving assembly can also release the restriction to enable the control rod mounting seat and the guiding assembly to fall under the action of gravity.

[0011] In an alternative embodiment, the driving assembly includes a driving motor, a driving rod, a driving wheel, and a guiding and limiting assembly;

[0012] The driving wheel is rotatably mounted on the mounting assembly, and a through hole is provided at the center of the driving wheel;

[0013] The driving motor is mounted on the mounting assembly and is configured to drive the driving wheel to rotate;

[0014] The bottom end of the driving rod is connected to the control rod mounting seat;

[0015] The top end of the driving rod passes through the through hole;

[0016] A guiding groove is spirally provided along the axial direction on the side wall of the driving rod;

[0017] Mounting holes are provided on the side wall of the driving wheel;

[0018] The guiding and limiting assembly is mounted in the mounting hole and is inserted into the guiding groove. The driving wheel can drive the guiding and limiting assembly to rotate, so that the guiding and limiting assembly cooperates with the guiding groove to drive the driving rod to drive the control rod mounting seat to rise or fall;

[0019] The guiding and limiting assembly can also be removed from the guiding groove, so that the control rod mounting seat, the guiding assembly, and the driving rod fall under the action of gravity.

[0020] In an alternative embodiment, the mounting hole is a threaded hole;

[0021] The guiding and limiting assembly includes a stud, and the stud is mounted in the threaded hole by thread fit. The stud can rotate to extend out of the guiding groove or be removed from the guiding groove. [[ID=]32]

[0022] In an alternative embodiment, the guiding and limiting assembly further includes a motor;

[0023] The motor is fixed relative to the driving wheel;

[0024] A fitting groove is recessed at the outer end of the stud, and the output shaft of the motor is inserted into the fitting groove. When the motor rotates, it can drive the stud to rotate while the stud can move relative to the output shaft of the motor.

[0025] In an alternative embodiment, the driving wheel includes a driving portion, an extending portion, and a mounting portion that are connected in sequence;

[0026] The through hole sequentially penetrates through the driving portion, the extending portion, and the mounting portion; [[ID=]]47]

[0027] The threaded hole is provided on the outer peripheral edge of the extension part, the motor is installed on the installation part, and the driving part is in transmission connection with the driving motor.

[0028] In an alternative embodiment, the driving part is a driving gear;

[0029] The driving gear is rotatably installed on the installation assembly, and a plurality of transmission gears are rotatably arranged on the periphery of the driving gear;

[0030] All the plurality of transmission gears are meshed with the driving gear;

[0031] The driving motor is meshed with the transmission gear.

[0032] In an alternative embodiment, the installation assembly includes a middle shell, an upper shell and a lower shell;

[0033] The middle shell is provided with an installation table, and a through hole is provided in the middle of the installation table;

[0034] The extension part is inserted into the through hole so that the driving wheel can rotate relative to the middle shell;

[0035] The transmission gear is rotatably installed on the middle shell and is located on the outer peripheral edge of the driving gear;

[0036] The upper shell is provided with a through hole, the upper shell is installed on the top of the middle shell, and the driving rod extends out from the through hole;

[0037] The driving motor is installed on the upper shell and is connected to the transmission gear;

[0038] The lower shell is provided with an avoidance hole, the lower shell is installed on the bottom of the middle shell, and the driving rod passes through the avoidance hole.

[0039] In an alternative embodiment, a first annular groove is provided on the bottom surface of the driving gear, and a second annular groove is provided on the installation table corresponding to the first annular groove;

[0040] Ball bearings are arranged in the first annular groove and the second annular groove;

[0041] A third annular groove is provided on the top of the driving gear, a fourth annular groove is provided on the upper shell corresponding to the third annular groove, and ball bearings are arranged in the third annular groove and the fourth annular groove.

[0042] In an alternative embodiment, there are at least two of the guiding and limiting components; at least two of the guiding grooves are spirally arranged along the axial direction on the side wall of the driving rod in the same direction; at least two mounting holes are provided on the side wall of the driving wheel; the guiding and limiting components are respectively mounted in the mounting holes and are respectively inserted into the guiding grooves;

[0043] and / or,

[0044] The guiding component includes a plurality of guiding rods, one end of each of the plurality of guiding rods is fixedly connected to the control rod mounting seat, the mounting component is provided with a plurality of guiding holes, and each of the plurality of guiding rods is respectively inserted into the guiding holes;

[0045] and / or,

[0046] A limiting ring platform is arranged at the top of the driving rod.

[0047] In a second aspect, the present invention provides a nuclear reaction device, including a reactor chamber, a fuel assembly, and the fast-response control rod drive device according to any one of the foregoing embodiments;

[0048] The fuel assembly is arranged in the reactor chamber, the mounting component is mounted in the reactor chamber, and the control rod mounting seat is made to correspond to the fuel assembly;

[0049] A plurality of control rods are mounted on the control rod mounting seat.

[0050] The beneficial effects of the fast-response control rod drive mechanism and the nuclear reaction device provided by the embodiments of the present invention include:

[0051] In this application, the driving component is arranged on the mounting component and is in transmission connection with the control rod mounting seat, so that the driving component can drive the control rod mounting seat to rise or fall to adjust the insertion depth of the control rod, thereby meeting the reaction rate. When there is an emergency shutdown requirement, the driving component can also release the restriction so that the control rod mounting seat and the guiding component fall under the action of gravity, which can improve the efficiency during emergency shutdown, so that the control rod can quickly fall and be completely inserted into the fuel assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0053] Figure 1 It is a schematic structural diagram of the fast-response control rod drive mechanism provided in this embodiment;

[0054] Figure 2 Schematic cross-sectional structure diagram of the rapid-response control rod drive mechanism provided in this embodiment;

[0055] Figure 3 is Figure 2 Enlarged schematic diagram at position A in

[0056] Figure 4 Schematic partial explosion structure diagram of the rapid-response control rod drive mechanism provided in this embodiment;

[0057] Figure 5 Schematic assembly structure diagram of the drive wheel and drive rod of the rapid-response control rod drive mechanism provided in this embodiment;

[0058] Figure 6 Schematic cross-sectional structure diagram of the guiding and limiting component of the rapid-response control rod drive mechanism provided in this embodiment installed on the drive wheel.

[0059] Icon: 100 - rapid-response control rod drive mechanism; 110 - mounting component; 111 - middle shell; 113 - upper shell; 115 - lower shell; 117 - mounting table; 119 - through hole; 121 - penetrating hole; 123 - avoidance hole; 125 - ball; 127 - guiding hole; 130 - guiding component; 131 - guiding rod; 137 - limiting ring platform; 150 - driving component; 151 - driving motor; 152 - driving rod; 153 - drive wheel; 154 - guiding and limiting component; 155 - through hole; 156 - guiding groove; 157 - mounting hole; 158 - stud; 159 - motor; 161 - fitting groove; 163 - driving part; 164 - extending part; 165 - mounting part; 166 - transmission gear; 170 - control rod mounting seat; 200 - control rod. Detailed implementation manners

[0060] The existing control rod drive device has a complex structure and a slow response during emergency shutdown, which cannot meet the existing requirements for emergency shutdown response.

[0061] In view of the above problems, the present invention provides a rapid-response control rod drive mechanism and a nuclear reaction device, which can improve the response efficiency during shutdown and have a simpler structure, thereby improving the problem that the above complex structure cannot meet the existing requirements for emergency shutdown response.

[0062] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0063] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0064] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0065] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships in which the products of the invention are usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0066] In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0067] It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict.

[0068] The overall structure, working principle, and achieved technical effects of the fast-response control rod drive mechanism and nuclear reaction device provided by the present invention will be introduced in detail below through embodiments and in conjunction with the accompanying drawings.

[0069] Please refer to Figures 1 to 6 , in this embodiment, the nuclear reaction device includes a reactor chamber (not shown in the figure), a fuel assembly (not shown in the figure), and a fast-response control rod 200 drive device. The fuel assembly is disposed in the reactor chamber. The fast-response control rod 200 drive device is installed in the reactor chamber, and a plurality of control rods 200 are installed on the fast-response control rod 200 drive device. The plurality of control rods 200 are correspondingly arranged with the fuel assembly.

[0070] In this embodiment, the quick-response control rod drive mechanism 100 includes a mounting assembly 110, a guiding assembly 130, a driving assembly 150, and a control rod mounting seat 170. The mounting assembly 110 is fixedly installed in the reactor chamber. The control rod mounting seat 170 is configured to mount the control rod 200 of the nuclear reactor. The control rod mounting seat 170 is installed at the bottom end of the guiding assembly 130. The guiding assembly 130 is installed on the mounting assembly 110 and can move relative to the mounting assembly 110. The driving assembly 150 is disposed on the mounting assembly 110 and is in transmission connection with the control rod mounting seat 170. The driving assembly 150 can drive the control rod mounting seat 170 to rise or fall. The driving assembly 150 can also release the restriction to enable the control rod mounting seat 170 and the guiding assembly 130 to fall under the action of gravity.

[0071] In this embodiment, the driving assembly 150 is disposed on the mounting assembly 110 and is in transmission connection with the control rod mounting seat 170. In this way, the driving assembly 150 can drive the control rod mounting seat 170 to rise or fall to adjust the insertion depth of the control rod 200, so as to meet the reaction rate. When there is an emergency shutdown requirement, the driving assembly 150 can also release the restriction to enable the control rod mounting seat 170 and the guiding assembly 130 to fall under the action of gravity. This can improve the efficiency during emergency shutdown, so that the control rod 200 can quickly fall and be fully inserted into the fuel assembly.

[0072] It should also be noted that the function of the guiding assembly 130 is to restrict the rotation of the control rod mounting seat 170, so as to ensure that the control rod 200 is inserted into a specific channel of the fuel assembly during the process of the driving assembly 150 driving the control seat to rise and fall and during the process of falling under gravity.

[0073] Please refer to Figures 1 to 6 , in this embodiment, the guiding assembly 130 includes a plurality of guiding rods 131. One end of the plurality of guiding rods 131 is fixedly connected to the control rod mounting seat 170. The mounting assembly 110 is provided with a plurality of guiding holes 127, and the guiding rods 131 are inserted into the guiding holes 127 in a one-to-one correspondence. Such a setting can enable the control rod mounting seat 170 to move only axially and not rotate.

[0074] For example, in one embodiment, the guiding rod 131 can be a cylindrical optical axis and is arranged at the four corners of the control rod mounting seat 170. The mounting assembly 110 is provided with four guiding holes 127, and the optical axes are inserted into the guiding holes 127 in a one-to-one correspondence. In order to reduce wear, structures such as linear bearings and bearing bushes can be installed in the guiding holes 127.

[0075] Please refer to Figures 1 to 6, in this embodiment, the driving assembly 150 includes a driving motor 151, a driving rod 152, a driving wheel 153, and a guiding and limiting assembly 154. The driving wheel 153 is rotatably mounted on the mounting assembly 110, and a through hole 155 is provided at the center of the driving wheel 153. The driving motor 151 is mounted on the mounting assembly 110 and is configured to drive the driving wheel 153 to rotate. The bottom end of the driving rod 152 is connected to the control rod mounting seat 170. The top end of the driving rod 152 passes through the through hole 155. A guiding groove 156 is spirally provided along the axial direction on the side wall of the driving rod 152. A mounting hole 157 is provided on the side wall of the driving wheel 153. The guiding and limiting assembly 154 is mounted in the mounting hole 157 and is inserted into the guiding groove 156. The driving wheel 153 can drive the guiding and limiting assembly 154 to rotate, so that the guiding and limiting assembly 154 cooperates with the guiding groove 156 to drive the driving rod 152 to drive the control rod mounting seat 170 to rise or fall. The guiding and limiting assembly 154 can also be removed from the guiding groove 156, so that the control rod mounting seat 170, the guiding assembly 130, and the driving rod 152 fall under the action of gravity.

[0076] In this embodiment, by spirally providing the guiding groove 156 along the axial direction on the side wall of the driving rod 152, the driving rod 152 is equivalent to a screw rod. A mounting hole 157 is provided in the driving wheel 153, and the guiding and limiting assembly 154 is provided in the mounting hole 157. When the guiding and limiting assembly 154 extends into the guiding groove 156, a lead screw-nut transmission pair is formed, and the driving wheel 153 and the guiding and limiting assembly 154 extending into the guiding groove 156 form a structure similar to a nut as a whole. Driving the driving wheel 153 to drive the guiding and limiting assembly 154 to rotate can make the driving rod 152 drive the control rod mounting seat 170 to move axially to realize lifting, thereby controlling the insertion depth of the control rod 200. When an emergency shutdown of the reactor is required, it is only necessary to remove the guiding and limiting assembly 154 from the guiding groove 156. After that, other accessories will quickly fall under the action of gravity, and the operation is more convenient.

[0077] It should be noted that the guiding groove 156 is similar to a thread groove, which can convert rotation into axial movement. The bottom end of the driving rod 152 and the control rod mounting seat 170 can be connected by fixing means such as welding.

[0078] Please refer to Figures 1 to 6 , in this embodiment, the mounting hole 157 is a threaded hole. The guiding and limiting assembly 154 includes a stud 158, and the stud 158 is mounted in the threaded hole by thread fit. The stud can rotate to extend out of the guiding groove 156 or be removed from the guiding groove 156.

[0079] In this embodiment, the mounting hole 157 is set as a threaded hole, and the guiding and limiting assembly 154 is set as a stud 158. In this way, the end of the stud can be conveniently inserted into or removed from the guiding groove 156 by thread fit, and the structure is simple and the operation is more convenient.

[0080] Furthermore, a chamfer is provided at one end of the stud 158 inserted into the guiding groove 156, which can enable the stud 158 to be better inserted into the guiding groove 156.

[0081] Please refer to Figures 1 to 6 , in this embodiment, the guiding and limiting component 154 further includes a motor 159, which is fixed relative to the driving wheel 153. A fitting groove 161 is recessed at the outer end of the stud 158, and the output shaft of the motor 159 is inserted into the fitting groove 161. When the motor 159 rotates, it can drive the stud 158 to rotate while the stud 158 can move relative to the output shaft of the motor 159.

[0082] In this embodiment, by recessing the fitting groove 161 at the outer end of the stud 158 and inserting the output shaft of the motor 159 into the fitting groove 161, the stud 158 can be driven to rotate by the motor 159, and the stud 158 can be extended and retracted in cooperation with the threaded hole. The structure is simple and automatic control can be achieved. Most importantly, the motor 159 can operate with power off in the case of non-emergency reactor shutdown.

[0083] Furthermore, the fitting groove 161 and the output shaft of the motor 159 are in clearance fit, which can ensure the movement of the stud 158 relative to the output shaft of the motor 159. The cross-section of the fitting groove 161 corresponds to the cross-section of the output shaft of the motor 159, and the size can be slightly smaller, and both can adopt non-circular cross-section shapes.

[0084] In some embodiments of the present application, the cross-section of the fitting groove 161 is hexagonal, and the output shaft of the motor 159 is also in a hexagonal structure. Of course, the shape of the fitting groove 161 can also be oval, polygonal, etc.

[0085] Secondly, the fitting groove 161 can also be provided on the output shaft of the motor 159, and one end outside the stud 158 can be provided with a structure matching the fitting groove 161, so that the stud 158 can be inserted into the fitting groove 161 of the output shaft of the motor 159.

[0086] Of course, in some other embodiments of the present application, the guiding and limiting component 154 can also be a telescopic component, such as an electric control telescopic rod. The telescopic end of the electric control telescopic rod is inserted into the mounting hole 157, and the insertion into the guiding groove 156 can be achieved through the expansion and contraction of the electric control telescopic rod.

[0087] Please refer to Figures 1 to 6 , in this embodiment, the driving wheel 153 includes a driving part 163, an extending part 164 and a mounting part 165 connected in sequence. The through hole 155 sequentially penetrates through the driving part 163, the extending part 164 and the mounting part 165. The threaded hole is provided on the outer peripheral edge of the extending part 164. The motor 159 is mounted on the mounting part 165, and the driving part 163 is in transmission connection with the driving motor 151.

[0088] In this embodiment, setting the driving wheel 153 to the above structure can make it more convenient for the driving motor 151 to drive and rotate, and also more convenient for the installation of the motor 159.

[0089] In this embodiment, the driving part 163 and the extending part 164 are integrally arranged, and the extending part 164 is arranged on the bottom wall of the driving part 163. The mounting part 165 is mounted at the bottom end of the extending part 164 by welding or threaded engagement. The structure of the mounting part 165 is annular. This is convenient for manufacturing and installation.

[0090] Please refer to Figures 1 to 6 , in this embodiment, the driving part 163 is a driving gear. The driving gear is rotatably mounted on the mounting assembly 110, and a plurality of transmission gears 166 are rotatably arranged on the periphery of the driving gear. The plurality of transmission gears 166 are all meshed with the driving gear. The driving motor 151 is meshed with the transmission gear 166.

[0091] In this embodiment, gear transmission is adopted, so that the transmission ratio can be controlled and it is convenient for manufacturing. Most importantly, such a layout can also avoid the influence of the driving motor 151 on the driving rod 152.

[0092] In this embodiment, the mounting assembly 110 includes a middle shell 111, an upper shell 113 and a lower shell 115. The middle shell 111 is provided with a mounting table 117, and a through hole 119 is provided in the middle of the mounting table 117. The extending part 164 is inserted into the through hole 119 so that the driving wheel 153 can rotate relative to the middle shell 111. The transmission gears 166 are rotatably mounted on the middle shell 111 and are located on the outer periphery of the driving gear. The upper shell 113 is provided with a through hole 121, the upper shell 113 is mounted on the top of the middle shell 111, and the driving rod 152 extends out from the through hole 121. The driving motor 151 is mounted on the upper shell 113 and is connected to the transmission gear 166. The lower shell 115 is provided with an avoidance hole 123, the lower shell 115 is mounted on the bottom of the middle shell 111, and the driving rod 152 passes through the avoidance hole 123. Secondly, the upper shell 113, the middle shell 111 and the lower shell 115 are all provided with guide holes 127 for the guide rod to pass through.

[0093] Please refer to Figures 1 to 6 , in this embodiment, four transmission gears 166 are provided, and the four transmission gears 166 are equally spaced in the circumferential direction. The four transmission gears 166 are rotatably mounted between the upper shell 113 and the middle shell 111. There are four driving motors 151, and the four driving motors 151 are all connected to the upper shell 113, and the output shafts are respectively connected to one transmission gear 166. Arranging a plurality of driving motors 151 can ensure the normal operation of the system even when some of the motors 159 are damaged and fail.

[0094] Of course, in some other embodiments of the present application, only one driving motor 151 may be provided, and the driving motor 151 may be connected to one of the transmission gears 166.

[0095] Furthermore, a first annular groove is provided on the bottom surface of the driving gear, and a second annular groove corresponding to the first annular groove is provided on the mounting table 117. Ball bearings 125 are provided in the first annular groove and the second annular groove. A third annular groove is provided on the top of the driving gear, and a fourth annular groove corresponding to the third annular groove is provided on the upper housing 113. Ball bearings 125 are provided in the third annular groove and the fourth annular groove.

[0096] In this embodiment, by providing ball bearings 125 on both sides of the driving gear, it is better to realize the rotation of the driving wheel 153, and secondly, the friction and noise can also be reduced.

[0097] Please refer to Figures 1 to 6 , in this embodiment, the guiding and limiting assembly 154 includes at least two; at least two guiding grooves 156 are spirally arranged along the axial direction on the side wall of the driving rod 152 in the same direction; at least two mounting holes 157 are provided on the side wall of the driving wheel 153; the guiding and limiting assemblies 154 are respectively mounted in the mounting holes 157 and are respectively inserted into the guiding grooves 156. By providing multiple guiding and limiting assemblies 154 and guiding grooves 156 in this embodiment, it is safer to use.

[0098] Furthermore, limiting ring platforms 137 are provided at both the top and the bottom of the driving rod 152. The limiting ring platforms 137 can limit the two end points of the movement. A limiting ring platform 137 is also provided at the top end of the optical axis.

[0099] Secondly, it should also be noted that after the stud 158 is removed from the guiding groove 156, when the control rod 200 descends under the action of gravity and needs to be lifted again subsequently, it is necessary to determine whether the stud 158 is aligned with the guiding groove 156. If the stud 158 corresponds to the guiding groove 156, the motor 159 can be directly driven to rotate the stud 158 so that the end of the stud 158 extends into the guiding groove 156. If the stud 158 does not correspond to the guiding groove 156, it needs to be reset linearly. After the driving wheel 153 drives the stud 158 to rotate to the position aligned with the guiding groove 156, the motor 159 is then used to drive the stud 158 to rotate so that the end of the stud 158 is inserted into the guiding groove 156. Whether the stud 158 is aligned with the guiding groove 156 can be determined according to the angle of the stud 158 on the circle with the axis of the driving rod 152 as the center. For example, by comparing the current angle with the calibrated angle, it can be determined whether they are aligned.

[0100] In summary, for the quick-response control rod drive mechanism 100 and nuclear reaction device provided in this embodiment, the drive assembly 150 is disposed on the mounting assembly 110 and is in transmission connection with the control rod mounting seat 170. In this way, the drive assembly 150 can drive the control rod mounting seat 170 to rise or fall to adjust the insertion depth of the control rod 200, so as to meet the reaction rate. When there is an emergency shutdown requirement, the drive assembly 150 can also release the restriction to enable the control rod mounting seat 170 and the guiding assembly 130 to fall under the action of gravity, which can improve the efficiency during emergency shutdown, so that the control rod 200 can quickly fall and be fully inserted into the fuel assembly.

[0101] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A control rod drive mechanism with quick response, characterized in that It includes an installation component (110), a guiding component (130), a driving component (150), and a control rod mounting seat (170); The control rod mounting seat (170) is configured to mount the control rod (200) of a nuclear reactor; The control rod mounting seat (170) is mounted at the bottom end of the guiding component (130); The guiding component (130) is mounted on the installation component (110) and can move relative to the installation component (110); The driving component (150) is arranged on the installation component (110) and is in transmission connection with the control rod mounting seat (170). The driving component (150) can drive the control rod mounting seat (170) to rise or fall. The driving component (150) can also release the restriction to enable the control rod mounting seat (170) and the guiding component (130) to fall under the action of gravity; The driving component (150) includes a driving motor (151), a driving rod (152), a driving wheel (153), and a guiding and limiting component (154); The driving wheel (153) is rotatably mounted on the installation component (110), and a through hole (155) is provided at the center of the driving wheel (153); The driving motor (151) is mounted on the installation component (110) and is configured to drive the driving wheel (153) to rotate; The bottom end of the driving rod (152) is connected to the control rod mounting seat (170); The top end of the driving rod (152) passes through the through hole (155); A guiding groove (156) is spirally arranged along the axial direction on the side wall of the driving rod (152); An installation hole (157) is provided on the side wall of the driving wheel (153); The guiding and limiting component (154) is mounted in the installation hole (157) and is inserted into the guiding groove (156). The driving wheel (153) can drive the guiding and limiting component (154) to rotate, so that the guiding and limiting component (154) cooperates with the guiding groove (156) to drive the driving rod (152) to drive the control rod mounting seat (170) to rise or fall; The guiding and limiting component (154) can also be removed from the guiding groove (156), so that the control rod mounting seat (170), the guiding component (130), and the driving rod (152) fall under the action of gravity.

2. The quick-response control rod drive mechanism according to claim 1, wherein The installation hole (157) is a threaded hole; The guiding and limiting component (154) includes a stud (158), and the stud (158) is mounted in the threaded hole by thread fit. The rotation of the stud (158) can extend out of the guiding groove (156) or be removed from the guiding groove (156).

3. The quick-response control rod drive mechanism according to claim 2, characterized in that, The guiding and limiting component (154) further includes a motor (159); The motor (159) is fixed relative to the driving wheel (153); The outer end of the stud (158) is recessed with a fitting groove (161), the output shaft of the motor (159) is inserted into the fitting groove (161), and when the motor (159) rotates, it can drive the stud (158) to rotate while the stud (158) can move relative to the output shaft of the motor (159).

4. The quick-response control rod drive mechanism according to claim 3, wherein The driving wheel (153) includes a driving part (163), an extending part (164) and a mounting part (165) connected in sequence; The through hole (155) sequentially penetrates the driving part (163), the extending part (164) and the mounting part (165); The threaded hole is provided on the outer peripheral edge of the extending part (164), the motor (159) is mounted on the mounting part (165), and the driving part (163) is in transmission connection with the driving motor (151).

5. The quick-response control rod drive mechanism according to claim 4, wherein The driving part (163) is a driving gear; The driving gear is rotatably mounted on the mounting assembly (110), and a plurality of transmission gears (166) are rotatably arranged on the periphery of the driving gear; All of the plurality of transmission gears (166) are meshed with the driving gear; The driving motor (151) is meshed with the transmission gear (166).

6. The quick-response control rod drive mechanism according to claim 5, characterized in that, The mounting assembly (110) includes a middle shell (111), an upper shell (113) and a lower shell (115); The middle shell (111) is provided with a mounting table (117), and a through hole (119) is provided in the middle of the mounting table (117); The extending part (164) is inserted into the through hole (119) so that the driving wheel (153) can rotate relative to the middle shell (111); The transmission gear (166) is rotatably mounted on the middle shell (111) and is located on the outer periphery of the driving gear; The upper shell (113) is provided with a through hole (121), the upper shell (113) is mounted on the top of the middle shell (111), and the driving rod (152) extends out from the through hole (121); The driving motor (151) is mounted on the upper shell (113) and is connected to the transmission gear (166); The lower shell (115) is provided with an avoidance hole (123), the lower shell (115) is mounted on the bottom of the middle shell (111), and the driving rod (152) passes through the avoidance hole (123).

7. The quick-response control rod drive mechanism according to claim 6, characterized in that, A first annular groove is provided on the bottom surface of the driving gear, and a second annular groove is provided on the mounting table (117) corresponding to the first annular groove; Ball bearings (125) are provided in the first annular groove and the second annular groove; A third annular groove is provided on the top of the driving gear, a fourth annular groove is provided on the upper shell (113) corresponding to the third annular groove, and ball bearings (125) are provided in the third annular groove and the fourth annular groove.

8. The quick-response control rod drive mechanism according to any one of claims 1-7, characterized in that, The guiding and limiting assembly (154) includes at least two; at least two of the guiding grooves (156) are spirally arranged along the axial direction on the side wall of the driving rod (152) in the same direction; at least two of the mounting holes (157) are arranged on the side wall of the driving wheel (153); the guiding and limiting assemblies (154) are respectively mounted in the mounting holes (157) and are respectively inserted into the guiding grooves (156); and / or, The guiding assembly (130) includes a plurality of guiding rods (131), one end of each of the plurality of guiding rods (131) is fixedly connected to the control rod mounting seat (170), the mounting assembly (110) is provided with a plurality of guiding holes (127), and each of the plurality of guiding rods (131) is respectively inserted into the guiding holes (127); and / or, A limiting ring platform (137) is arranged at the top of the driving rod (152).

9. A nuclear reaction device, characterized in that, Comprising a reactor chamber, a fuel assembly, and the fast-response control rod drive mechanism according to any one of claims 1-8; The fuel assembly is arranged in the reactor chamber, the mounting assembly (110) is mounted in the reactor chamber, and the control rod mounting seat (170) is made to correspond to the fuel assembly; A plurality of control rods (200) are mounted on the control rod mounting seat (170).

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