Quick-response control rod driving mechanism and nuclear reaction device

Abstract

The embodiment of the invention provides a quick-response control rod driving mechanism and a nuclear reaction device, and relates to the field of nuclear power equipment. The quick-response control rod driving mechanism comprises a mounting assembly, a guide assembly, a driving assembly and a control rod mounting seat. The control rod mount is configured to mount a control rod of a nuclear reactor. The control rod mounting seat is mounted at the bottom end of the guide assembly. The guide assembly is installed on the installation assembly and can move relative to the installation 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 ascend or descend, and the driving assembly can also relieve limitation so that the control rod mounting seat and the guide assembly can descend under the action of gravity. The reactor shutdown response efficiency can be improved, and the structure is simpler.

Description

Technical Field

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

[0002] The 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 rods is to control the intensity of the nuclear reaction by absorbing neutrons, thereby regulating the power output of the reactor. When the reactor is started, the control rods are usually fully inserted to prevent the occurrence of a chain reaction. When preparing to start, the control rods are gradually withdrawn to allow more neutrons to participate in the fission reaction, so that the reactor gradually reaches a critical state and begins to generate electricity. When the reactor needs to be stopped, the control rods will be quickly inserted into the reactor core to absorb a large number of neutrons to quickly stop the chain reaction. This process is also called emergency shutdown, which is usually used in abnormal situations or emergencies.

[0003] The control rod drive is the main structure for installing the control rod and adjusting the insertion and withdrawal of the control rod. The existing control rod drive is complex in structure and responds slowly during emergency shutdown, and cannot meet the existing emergency shutdown response requirements. Summary of the invention

[0004] The purpose of the present invention includes providing a fast-response control rod drive mechanism and a nuclear reaction device, which can improve the response efficiency during shutdown and have a simpler structure.

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

[0006] In a first aspect, the present invention provides a fast-response control rod drive mechanism, comprising a mounting assembly, a guide assembly, a drive assembly, and a control rod mounting seat;

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

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

[0009] The guide 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. The driving assembly can also release the restriction to make the control rod mounting seat and the guide assembly fall under the action of gravity.

[0011] In an optional embodiment, the driving assembly includes a driving motor, a driving rod, a driving wheel, and a guide limiter 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] The side wall of the driving rod is provided with a guide groove along the axial spiral;

[0017] The side wall of the driving wheel is provided with a mounting hole;

[0018] The guide limiter assembly is installed in the installation hole and inserted in the guide groove. The driving wheel can drive the guide limiter assembly to rotate, so that the guide limiter assembly cooperates with the guide groove to drive the driving rod to drive the control rod mounting seat to rise or fall.

[0019] The guide stop assembly can also be moved out of the guide groove to allow the control rod mounting seat, the guide assembly and the drive rod to fall under the action of gravity.

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

[0021] The guide and limit assembly comprises a stud, which is installed in the threaded hole through threaded cooperation, and the stud can extend out of the guide groove or move out of the guide groove by rotating.

[0022] In an optional embodiment, the guide limit assembly further includes a motor;

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

[0024] The outer end of the stud is concavely provided with an engaging groove, and the output shaft of the motor is inserted into the engaging groove. The rotation of the motor can drive the stud to rotate, and the stud can move relative to the output shaft of the motor.

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

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

[0027] The threaded hole is arranged on the outer periphery of the extending portion, the motor is mounted on the mounting portion, and the driving portion is drivingly connected to the driving motor.

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

[0029] The driving gear is rotatably mounted on the mounting assembly, and the mounting assembly is rotatably provided with a plurality of transmission gears on the periphery of the driving gear;

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

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

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

[0033] The middle shell is provided with a mounting platform, and a through hole is provided in the middle of the mounting platform;

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

[0035] The transmission gear is rotatably mounted on the middle housing and is located at the outer periphery of the driving gear;

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

[0037] The driving motor is mounted on the upper shell and 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 is passed through the avoidance hole.

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

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

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

[0042] In an optional embodiment, the guide limiter assemblies include at least two; the side wall of the driving rod is provided with at least two guide grooves along the axial same direction spiral; the side wall of the driving wheel is provided with at least two mounting holes; the guide limiter assemblies are installed in the mounting holes one by one, and are plugged in the guide grooves one by one;

[0043] and / or,

[0044] The guide assembly comprises a plurality of guide rods, one end of each of which is fixedly connected to a control rod mounting seat, and the mounting assembly is provided with a plurality of guide holes, into which the guide rods are correspondingly inserted one by one;

[0045] and / or,

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

[0047] In a second aspect, the present invention provides a nuclear reaction device, comprising a reactor chamber, a fuel assembly, and a fast-response control rod drive device as described in any one of the aforementioned embodiments;

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

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

[0050] The fast-response control rod drive mechanism and nuclear reactor provided by the embodiments of the present invention have the following beneficial effects:

[0051] The present application sets the drive assembly on the mounting assembly and is in transmission connection with the control rod mounting seat, so that the drive assembly 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 a need for emergency shutdown, the drive assembly can also release the restriction to allow the control rod mounting seat and the guide assembly to fall under the action of gravity, which can improve the efficiency of emergency shutdown, so that the control rod can fall quickly and be fully 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 drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

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

[0054] Figure 2 A schematic cross-sectional view of the fast-response control rod drive mechanism provided in this embodiment;

[0055] Figure 3 for Figure 2 The enlarged schematic diagram at A in the middle;

[0056] Figure 4 A schematic diagram of a partial explosion structure of a fast-response control rod drive mechanism provided in this embodiment;

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

[0058] Figure 6 A schematic cross-sectional view of the structure in which the guide limit assembly of the fast-response control rod drive mechanism provided in this embodiment is installed on the drive wheel.

[0059] Icons: 100-fast response control rod drive mechanism; 110-installation assembly; 111-middle shell; 113-upper shell; 115-lower shell; 117-mounting platform; 119-through hole; 121-through hole; 123-avoidance hole; 125-ball; 127-guide hole; 130-guide assembly; 131-guide rod; 137-limiting ring; 150-drive assembly; 151-drive motor; 152-drive rod; 153-drive wheel; 154-guide limit assembly; 155-through hole; 156-guide groove; 157-mounting hole; 158-stud; 159-motor; 161-embedded groove; 163-drive part; 164-extension part; 165-mounting part; 166-transmission gear; 170-control rod mounting seat; 200-control rod. DETAILED DESCRIPTION

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

[0061] In view of the above problems, the present invention provides a fast-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-mentioned complex structure cannot meet the existing emergency shutdown response requirements.

[0062] 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 are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0065] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0066] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0067] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0068] The overall structure, working principle and technical effects of the fast-response control rod drive mechanism and nuclear reactor provided by the present invention are described 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 reactor includes a reactor chamber (not shown), a fuel assembly (not shown) and a fast-response control rod 200 drive device. The fuel assembly is arranged in the reactor chamber. The fast-response control rod 200 drive device is installed in the reactor chamber, and the fast-response control rod 200 drive device is installed with a plurality of control rods 200. The plurality of control rods 200 are arranged corresponding to the fuel assembly.

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

[0071] In this embodiment, the drive assembly 150 is arranged on the mounting assembly 110 and is in transmission connection with the control rod mounting seat 170, so that 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 a need for emergency shutdown, the drive assembly 150 can also release the restriction to allow the control rod mounting seat 170 and the guide assembly 130 to fall under the action of gravity, so as to improve the efficiency of emergency shutdown, so that the control rod 200 can fall quickly and be fully inserted into the fuel assembly.

[0072] It should also be noted that the function of the guide assembly 130 is to limit the rotation of the control rod mounting seat 170, so as to ensure that the drive assembly 150 drives the control rod 200 to be inserted into the specific channel of the fuel assembly during the process of ascending and descending the control seat and during the process of gravity falling.

[0073] Please refer to Figures 1 to 6 In this embodiment, the guide assembly 130 includes a plurality of guide rods 131, one end of each of which is fixedly connected to the control rod mounting seat 170. The mounting assembly 110 is provided with a plurality of guide holes 127, and the plurality of guide rods 131 are correspondingly inserted into the guide holes 127. This arrangement enables the control rod mounting seat 170 to move only in the axial direction but not to rotate.

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

[0075] Please refer to Figures 1 to 6In this embodiment, the driving assembly 150 includes a driving motor 151, a driving rod 152, a driving wheel 153, and a guide stopper 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. The side wall of the driving rod 152 is provided with a guide groove 156 along the axial spiral. A mounting hole 157 is provided on the side wall of the driving wheel 153. The guide stopper assembly 154 is mounted in the mounting hole 157 and inserted in the guide groove 156. The driving wheel 153 can drive the guide stopper assembly 154 to rotate, so that the guide stopper assembly 154 cooperates with the guide groove 156 to drive the driving rod 152 to drive the control rod mounting seat 170 to rise or fall. The guide stop assembly 154 can also be moved out of the guide slot 156 to allow the control rod mounting seat 170, the guide assembly 130 and the drive rod 152 to fall under the action of gravity.

[0076] In this embodiment, a guide groove 156 is provided along the axial spiral on the side wall of the driving rod 152, so that the driving rod 152 is equivalent to a screw. A mounting hole 157 is provided on the driving wheel 153, and a guide stopper assembly 154 is provided in the mounting hole 157. When the guide stopper assembly 154 extends into the guide groove 156, a screw-nut transmission pair is formed, and the driving wheel 153 and the guide stopper assembly 154 extending into the guide groove 156 form a nut-like structure as a whole. The driving wheel 153 rotates with the guide stopper assembly 154, so that the driving rod 152 can drive the control rod mounting seat 170 to move axially to achieve lifting and lowering, thereby controlling the insertion depth of the control rod 200. When an emergency shutdown is required, it is only necessary to remove the guide stopper assembly 154 from the guide groove 156, and then other accessories will fall quickly under the action of gravity, which is more convenient to operate.

[0077] It should be noted that the guide 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 a fixing method such as welding.

[0078] Please refer to Figures 1 to 6 In this embodiment, the mounting hole 157 is a threaded hole. The guide limit assembly 154 includes a stud 158, which is mounted in the threaded hole by threaded engagement. The stud 158 can be extended into or out of the guide slot 156 by rotation.

[0079] In this embodiment, the mounting hole 157 is set as a threaded hole, and the guide limit assembly 154 is set as a stud 158, so that the end of the stud can be conveniently inserted into or removed from the guide groove 156 through threaded cooperation, and the structure is simple and the operation is more convenient.

[0080] Furthermore, one end of the stud 158 inserted into the guide groove 156 is provided with a chamfer, and the chamfer can make the stud 158 better inserted into the guide groove 156.

[0081] Please refer to Figures 1 to 6 In this embodiment, the guide limit assembly 154 further includes a motor 159, which is fixed relative to the driving wheel 153. An engaging groove 161 is recessed at the outer end of the stud 158, and the output shaft of the motor 159 is inserted into the engaging groove 161. The rotation of the motor 159 can drive the stud 158 to rotate, and the stud 158 can move relative to the output shaft of the motor 159.

[0082] In this embodiment, the outer end of the stud 158 is provided with an engaging groove 161, so that the output shaft of the motor 159 is inserted into the engaging groove 161, so that the stud 158 can be driven to rotate by the motor 159, and the stud 158 can be extended and retracted by cooperating with the threaded hole, the structure is simple, and automatic control can be realized. Most importantly, in the case of non-emergency shutdown, the motor 159 can be powered off and operated.

[0083] Furthermore, the interlocking groove 161 is clearance-matched with the output shaft of the motor 159, so that the stud 158 can move relative to the output shaft of the motor 159. The cross section of the interlocking 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-sectional 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 formed into a hexagonal structure. Of course, the shape of the fitting groove 161 can also be elliptical, polygonal, etc.

[0085] Secondly, the fitting groove 161 can also be set on the output shaft of the motor 159, and one end of the outer side of the stud 158 can be set to 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 guide limit assembly 154 may also be a telescopic assembly, such as an electrically controlled telescopic rod, etc. The telescopic end of the electrically controlled telescopic rod is inserted into the mounting hole 157, and the electrically controlled telescopic rod can be inserted into the guide groove 156 by telescoping the electrically controlled telescopic rod.

[0087] Please refer to Figures 1 to 6 In this embodiment, the driving wheel 153 includes a driving portion 163, an extension portion 164 and a mounting portion 165 which are connected in sequence. The through hole 155 passes through the driving portion 163, the extension portion 164 and the mounting portion 165 in sequence. The threaded hole is provided on the outer periphery of the extension portion 164. The motor 159 is installed on the mounting portion 165, and the driving portion 163 is drivingly connected to the driving motor 151.

[0088] In this embodiment, the driving wheel 153 is configured as the above structure, which can make it easier for the motor 151 to rotate and also easier for the motor 159 to be installed.

[0089] In this embodiment, the driving portion 163 and the extension portion 164 are integrally arranged, and the extension portion 164 is arranged on the bottom wall of the driving portion 163. The mounting portion 165 is mounted on the bottom end of the extension portion 164 by welding or threaded fitting. The mounting portion 165 has a circular ring structure, which 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. The mounting assembly 110 is rotatably provided with a plurality of transmission gears 166 at 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] This embodiment uses gear transmission, so the transmission ratio is controllable and easy to manufacture. 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 platform 117, and a through hole 119 is provided in the middle of the mounting platform 117. The extension portion 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 at 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 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 is penetrated 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 rods 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 arranged at equal intervals in the circumferential direction. The four transmission gears 166 are rotatably installed between the upper shell 113 and the middle shell 111. There are four drive motors 151, and the four drive motors 151 are all connected to the upper shell 113, and the output shafts are respectively connected to a transmission gear 166. Arranging multiple drive motors 151 can ensure the normal operation of the system even if some of the motors 159 are damaged or 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 is provided on the mounting platform 117 corresponding to the first annular groove. Balls 125 are provided in the first and second annular grooves. A third annular groove is provided on the top surface of the driving gear, and a fourth annular groove is provided on the upper shell 113 corresponding to the third annular groove, and balls 125 are provided in the third and fourth annular grooves.

[0096] In this embodiment, balls 125 are arranged on both sides of the driving gear, so that the driving wheel 153 can be rotated better and friction and noise can be reduced.

[0097] Please refer to Figures 1 to 6 In this embodiment, the guide limiter assembly 154 includes at least two; the side wall of the driving rod 152 is provided with at least two guide grooves 156 along the axial direction spiral; the side wall of the driving wheel 153 is provided with at least two mounting holes 157; the guide limiter assembly 154 is installed in the mounting holes 157 one by one, and is plugged in the guide grooves 156 one by one. This embodiment is provided with multiple guide limiter assemblies 154 and guide grooves 156, which is safer to use.

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

[0099] Secondly, it should be noted that after the stud 158 moves out of the guide groove 156, the control rod 200 descends due to gravity operation, and the subsequent action needs to lift the control rod 200 again, it is necessary to determine whether the stud 158 is aligned with the guide groove 156. If the stud 158 corresponds to the guide groove 156, the motor 159 can directly drive the stud 158 to rotate and drive the end of the stud 158 to extend into the guide groove 156. If the stud 158 does not correspond to the guide groove 156, it needs to be reset linearly, so that the driving wheel 153 drives the stud 158 to rotate to a position aligned with the guide groove 156, and then the motor 159 drives the stud 158 to rotate so that the end of the stud 158 is inserted into the guide groove 156. Whether the stud 158 is aligned with the guide groove 156 can be determined based on 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 it is aligned.

[0100] In summary, the fast-response control rod drive mechanism 100 and the nuclear reactor provided in this embodiment set the drive assembly 150 on the mounting assembly 110 and are in transmission connection with the control rod mounting seat 170, so that 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, thereby meeting the reaction rate. When there is a need for emergency shutdown, the drive assembly 150 can also release the restriction to allow the control rod mounting seat 170 and the guide assembly 130 to fall under the action of gravity, which can improve the efficiency of emergency shutdown, so that the control rod 200 can fall quickly and be fully inserted into the fuel assembly.

[0101] The above description is only a specific implementation mode 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 a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A fast-response control rod drive mechanism, characterized in that: It comprises a mounting assembly (110), a guide assembly (130), a drive assembly (150) and a control rod mounting seat (170); The control rod mounting seat (170) is configured to mount a control rod (200) of a nuclear reactor; The control rod mounting seat (170) is mounted on the bottom end of the guide assembly (130); The guide assembly (130) is mounted on the mounting assembly (110) and is movable relative to the mounting assembly (110); The driving assembly (150) is arranged 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 restrictions to allow the control rod mounting seat (170) and the guide assembly (130) to fall under the action of gravity.

2. The fast-response control rod drive mechanism according to claim 1, characterized in that: The driving assembly (150) comprises a driving motor (151), a driving rod (152), a driving wheel (153), and a guide 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); The side wall of the driving rod (152) is provided with a guide groove (156) along the axial spiral; The side wall of the driving wheel (153) is provided with a mounting hole (157); The guide and limit assembly (154) is installed in the installation hole (157) and inserted in the guide groove (156); the driving wheel (153) can drive the guide and limit assembly (154) to rotate, so that the guide and limit assembly (154) cooperates with the guide groove (156) to drive the driving rod (152) to drive the control rod mounting seat (170) to rise or fall; The guide stop assembly (154) can also be moved out of the guide slot (156) so that the control rod mounting seat (170), the guide assembly (130) and the drive rod (152) fall down under the action of gravity.

3. The fast-response control rod drive mechanism according to claim 2, characterized in that: The mounting hole (157) is a threaded hole; The guide limit assembly (154) comprises a stud (158), wherein the stud (158) is installed in the threaded hole through threaded engagement, and the stud (158) can be extended out of the guide groove (156) or moved out of the guide groove (156) by rotating.

4. The fast-response control rod drive mechanism according to claim 3, characterized in that: The guide and limit assembly (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 an engaging groove (161), and the output shaft of the motor (159) is inserted into the engaging groove (161). The motor (159) rotates to drive the stud (158) to rotate, and the stud (158) can move relative to the output shaft of the motor (159).

5. The fast-response control rod drive mechanism according to claim 4, characterized in that: The driving wheel (153) comprises a driving portion (163), an extending portion (164) and a mounting portion (165) which are connected in sequence; The through hole (155) sequentially penetrates the driving portion (163), the extending portion (164) and the mounting portion (165); The threaded hole is arranged on the outer periphery of the extension portion (164), the motor (159) is mounted on the mounting portion (165), and the driving portion (163) is drivingly connected to the driving motor (151).

6. The fast-response control rod drive mechanism according to claim 5, characterized in that: The driving part (163) is a driving gear; The driving gear is rotatably mounted on the mounting assembly (110), and the mounting assembly (110) is rotatably provided with a plurality of transmission gears (166) located 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).

7. The fast-response control rod drive mechanism according to claim 6, characterized in that: The mounting assembly (110) comprises a middle shell (111), an upper shell (113) and a lower shell (115); The middle shell (111) is provided with a mounting platform (117), and a through hole (119) is provided in the middle of the mounting platform (117); The extension portion (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 housing (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 installed 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 connected to the transmission gear (166); The lower shell (115) is provided with an avoidance hole (123), the lower shell (115) is installed on the bottom of the middle shell (111), and the driving rod (152) is passed through the avoidance hole (123).

8. The fast-response control rod drive mechanism according to claim 7, characterized in that: The bottom surface of the driving gear is provided with a first annular groove, and the mounting platform (117) is provided with a second annular groove corresponding to the first annular groove; Balls (125) are arranged in the first annular groove and the second annular groove; A third annular groove is arranged on the top of the driving gear, a fourth annular groove is arranged on the upper shell (113) corresponding to the third annular groove, and balls (125) are arranged in the third annular groove and the fourth annular groove.

9. The fast-response control rod drive mechanism according to any one of claims 2 to 8, characterized in that: The guide and limit assemblies (154) include at least two; the side wall of the driving rod (152) is provided with at least two guide grooves (156) along the axial same direction spiral; the side wall of the driving wheel (153) is provided with at least two mounting holes (157); the guide and limit assemblies (154) are installed in the mounting holes (157) in a one-to-one correspondence, and are plugged in the guide grooves (156) in a one-to-one correspondence; and / or, The guide assembly (130) comprises a plurality of guide rods (131), one end of each of the plurality of guide rods (131) is fixedly connected to a control rod mounting seat (170), and the mounting assembly (110) is provided with a plurality of guide holes (127), and the plurality of guide rods (131) are inserted into the guide holes (127) in a one-to-one correspondence; and / or, A limiting ring platform (137) is provided on the top of the driving rod (152).

10. A nuclear reaction device, characterized in that: A reactor chamber, a fuel assembly and a fast-response control rod drive mechanism as claimed in any one of claims 1 to 9; 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) corresponds to the fuel assembly; The control rod mounting seat (170) is mounted with a plurality of control rods (200).

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