Control rod driving mechanism capable of regulating and controlling power in groups

Abstract

The embodiment of the invention provides a control rod driving mechanism capable of regulating and controlling power in groups, and relates to the technical field of nuclear power equipment. The control rod driving mechanism capable of regulating and controlling power in groups comprises a driving assembly, a transmission assembly and a fuel assembly. The driving assembly comprises multiple driving pieces, the transmission assembly comprises multiple connecting pieces, control rods are installed on the connecting pieces, the fuel assembly is located at the ends, away from the connecting pieces, of the control rods, and the driving pieces are used for driving the connecting pieces to move in the axis direction of the control rods so that the control rods can be inserted into or pulled out of the fuel assembly. The control rods on the different connecting pieces are driven by the different driving pieces to move, the control rods corresponding to different areas of the fuel assembly can be allowed to be independently adjusted, the axial positions of the different control rods relative to the fuel assembly can be adjusted according to the actual reaction conditions above and below the fuel assembly, fuel resources are fully utilized, and the fuel efficiency is improved. And the relative homogeneous reaction of the fuel in the fuel assembly can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power equipment, and in particular to a control rod driving mechanism capable of regulating power in groups. Background Art

[0002] A nuclear reactor is a device used to control and utilize nuclear fission reactions. The main function of a nuclear reactor is to generate heat energy by controlling fission reactions and convert this heat energy into useful energy forms, such as electricity, heat or other forms of energy. Nuclear reactors mainly include pressurized water reactors, boiling water reactors, heavy water reactors, etc. For pressurized water reactors, the control rod drive assembly is an important part of the pressurized water reactor. The through-hole drives the control rod to lift, lower, hold or quickly insert, control the start and stop of the reactor and adjust the reaction power.

[0003] Some existing control rod drive mechanisms capable of regulating power in groups are prone to causing inhomogeneous fuel reactions in fuel assemblies after operation. Summary of the invention

[0004] The purpose of the present invention includes providing a control rod drive mechanism capable of regulating power in groups, which can achieve a relatively homogeneous reaction of fuel in a fuel assembly.

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

[0006] In a first aspect, the present invention provides a control rod drive mechanism capable of regulating power in groups, comprising:

[0007] A drive assembly, the drive assembly comprising a plurality of drive members;

[0008] A transmission assembly, the transmission assembly includes a plurality of connecting members, control rods are mounted on the connecting members, and each connecting member is connected to a driving member;

[0009] A fuel assembly, which is located at the end of the control rod away from the connector;

[0010] The driving member is used to drive the connecting member to move along the axial direction of the control rod so that the control rod can be inserted into or pulled out of the fuel assembly.

[0011] In an optional embodiment, the driving member includes a transmission gear and a driving structure, and the driving structure is used to drive the transmission gear to rotate;

[0012] The transmission assembly also includes a plurality of transmission racks, the transmission racks include an assembly surface, a plurality of meshing teeth extending along the axis direction of the control rod are provided on the assembly surface, and the meshing teeth are meshed with the transmission gear, each driving member is connected to a transmission rack through the transmission gear, one end of the transmission rack is connected to the connecting member, and the number of transmission racks, driving members and connecting members is the same.

[0013] In an optional embodiment, there are two transmission racks and the two transmission racks are movably connected. The transmission rack is in the shape of a triangular prism. The outer peripheral surface of the transmission rack includes two adjacent assembly surfaces and a fitting surface located between the two assembly surfaces. The fitting surfaces of the two transmission racks are relative and can move relative to each other in the axial direction of the control rod.

[0014] In an optional embodiment, the four assembly surfaces on the two transmission racks are sequentially connected at an angle, and any two adjacent assembly surfaces are arranged at an angle of 90 degrees.

[0015] In an optional embodiment, the two driving members are respectively a first driving member and a second driving member, the first driving member includes a first transmission gear and a second transmission gear, the second driving member includes a third transmission gear and a fourth transmission gear, the first transmission gear and the second transmission gear are respectively engaged with the meshing teeth on the two assembly surfaces of one of the transmission racks, and the third transmission gear and the fourth transmission gear are respectively engaged with the meshing teeth on the two assembly surfaces of the other transmission rack.

[0016] In an optional embodiment, the driving assembly also includes a driving block, which is provided with a mating hole. The inner wall of the mating hole is provided with an assembly groove for installing a transmission gear. Two transmission racks are passed through the mating hole. Each transmission gear can rotate around its own axis relative to the driving block, and the transmission gears are exposed from the mating hole.

[0017] In an optional embodiment, the number of drive blocks is two and the two drive blocks are arranged in sequence along the axial direction of the control rod, the two drive blocks are respectively a first drive block and a second drive block, the matching hole of the first drive block is provided with first assembly grooves on both sides along the first direction, the first transmission gear and the third transmission gear are respectively installed in the two first assembly grooves, the matching hole of the second drive block is provided with second assembly grooves on both sides along the second direction, the second transmission gear and the fourth transmission gear are respectively installed in the two second assembly grooves, the first direction forms an angle with the second direction and are both perpendicular to the axial direction of the control rod.

[0018] In an optional embodiment, the mating surface of the transmission rack is provided with a mating groove and a mating protrusion, wherein the mating protrusion of one transmission rack is slidably mated with the mating groove of another transmission rack, and the mating groove and the mating protrusion extend along the length direction of the transmission rack.

[0019] In an optional embodiment, the mating surface of the transmission rack is provided with a mounting groove, and the mounting grooves of the two transmission racks together form a mounting hole. A control rod drive mechanism capable of regulating power in groups also includes a measuring rod, which passes through the mounting hole and is used to extend into the fuel assembly.

[0020] In an optional embodiment, a first connector is provided at one end of the transmission rack close to the fuel assembly, the connector includes a clamping plate and a second connector connected to each other, the second connector is located on a side of the clamping plate away from the fuel assembly and connected to the first connector, and a control rod is installed on a side of the clamping plate close to the fuel assembly;

[0021] The clamping plate is provided with hollow holes, which penetrate the upper and lower sides of the clamping plate;

[0022] The plane where the axes of the second connectors on the two clamping disks are located is a preset plane, the clamping disks are symmetrically arranged about the preset plane, and the plurality of control rods are symmetrically arranged about the preset plane.

[0023] The beneficial effects of a control rod drive mechanism with group-controlled power provided by an embodiment of the present invention include: controlling the movement of control rods on different connecting parts by different driving parts, allowing the control rods in different areas of the corresponding fuel assembly to be adjusted independently, and adjusting the axial positions of different groups of control rods relative to the fuel assembly according to the actual reaction conditions above and below the fuel assembly, which can burn fuel more evenly, improve the overall efficiency of the reactor, and make full use of fuel resources, that is, it can achieve a relatively homogeneous reaction of the fuel in the fuel assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 A schematic diagram of the structure of a control rod drive mechanism capable of group-adjusting power from a first perspective provided in this embodiment;

[0026] Figure 2 A schematic diagram of the structure of a control rod drive mechanism capable of group-adjusting power provided by the present embodiment at a second viewing angle when neither the first drive block nor the second drive block is shown;

[0027] Figure 3 A schematic diagram of the structure of the two transmission racks provided in this embodiment when assembled;

[0028] Figure 4 An exploded schematic diagram of a first driving block and a second driving block provided in this embodiment;

[0029] Figure 5 A schematic structural diagram of the first clamping disk and the second clamping disk provided in this embodiment at a third viewing angle;

[0030] Figure 6 A schematic structural diagram of the first clamping plate and the second clamping plate provided in this embodiment at a fourth viewing angle.

[0031] Icons: 1-a control rod drive mechanism capable of regulating power in groups; 100-a drive assembly; 110-a first drive block; 111-a first assembly groove; 120-a second drive block; 121-a second assembly groove; 101-a matching hole; 130-a first transmission gear; 140-a second transmission gear; 150-a third transmission gear; 160-a fourth transmission gear; 200-a drive assembly; 210-a transmission rack; 211-an assembly surface; 212-a fitting surface; 213-a matching groove; 214-a matching protrusion; 215-a first connector; 206-a mounting hole; 220-a connector; 221-a first clamping plate; 222-a second clamping plate; 223-a control rod; 225-a second connector; 226-a hollow hole; 300-a fuel assembly; 400-a measuring rod; 2-a preset plane. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The specific structure of a control rod drive mechanism capable of group-adjusting power provided by an embodiment of the present invention and the corresponding technical effects thereof are described in detail below in conjunction with the patent drawings.

[0039] Please refer to Figure 1-Figure 4 A control rod drive mechanism 1 capable of regulating power in groups provided by an embodiment of the present invention comprises a drive assembly 100, a transmission assembly 200 and a fuel assembly 300. The drive assembly 100 comprises a plurality of drive members, the transmission assembly 200 comprises a plurality of connectors 220, a control rod 223 is mounted on the connector 220, and the fuel assembly 300 is located at an end of the control rod 223 away from the connector 220, wherein the drive member is used to drive the connector 220 to move along the axis direction of the control rod 223 so that the control rod 223 is inserted into or pulled out of the fuel assembly 300.

[0040] It should be noted that, in order to uniformly control the control rods 223 and reduce the number of driving parts, some existing control rod drive mechanisms 1 that can adjust power in groups have driving parts that simultaneously drive all the control rods 223 to move along the axis direction of the control rods 223 to be inserted into the fuel assembly 300, thereby controlling the reactor power. It can be understood that since the driving parts in the existing control rod drive mechanism 1 that can adjust power in groups simultaneously drive all the control rods 223 to move up and down to be inserted into the fuel assembly 300, thereby controlling the reactor power, when controlling the power, when the control rods 223 are to be inserted into the fuel assembly 300 from top to bottom, the power of the fuel above the fuel assembly 300 is suppressed, while the fuel below is not affected. Under long-term operating conditions, an inhomogeneous reaction of the upper and lower fuels will be caused, thereby affecting the life of the fuel assembly 300.

[0041] In a nuclear reactor, neutron flux refers to the number of neutrons passing through a unit area per unit time. Neutron flux distribution directly affects the fission reaction rate inside the fuel assembly 300. The higher the fission reaction rate, the faster the fuel consumption, and the local temperature and pressure will increase accordingly. Therefore, controlling the neutron flux distribution is crucial to maintaining a uniform reaction inside the fuel assembly 300.

[0042] It has been found that since the drive controls the up and down movement of all the control rods 223, all the control rods 223 are raised or lowered by the same distance at the same time. With this control, the neutron flux distribution above and below the fuel assembly 300 is uneven, resulting in the power of the upper fuel being suppressed, while the lower fuel is not easily affected, which will cause a temperature difference between the upper and lower parts of the fuel assembly 300, thereby causing local overheating.

[0043] In addition, all control rods 223 are inserted into the fuel assembly 300 up and down by overall control, and the neutron flux distribution inside the fuel assembly 300 cannot be accurately controlled, resulting in uneven fuel combustion and different fuel consumption rates at the top and bottom, which affects the fuel service life.

[0044] The fission reaction rates at the top and bottom of the fuel assembly 300 are different. The fuel resources cannot be fully utilized by overall controlling the up and down movement of all the control rods 223, which will also lead to a decrease in reactor efficiency.

[0045] In the present embodiment, since there are multiple driving members, the transmission assembly 200 has multiple connecting members 220, and control rods 223 are installed on the connecting members 220. Each connecting member 220 is connected to a driving member. Therefore, different control rods 223 can be controlled to move up and down by different driving members. It can be seen that when the operator is controlling the reactor fuel power, the control rods 223 on each connecting member 220 can be divided into a group of control rods 223, and different groups of control rods 223 can be driven to move up and down by different driving members, thereby realizing independent control of different groups of control rods 223.

[0046] It can be understood that by driving the control rods 223 in groups, the control rods 223 corresponding to different areas of the fuel assembly 300 can be adjusted independently. The axial positions of different groups of control rods 223 relative to the fuel assembly 300 can be adjusted separately according to the actual reaction conditions above and below the fuel assembly 300. The neutron flux distribution inside the fuel assembly 300 can be adjusted more accurately, so that the fission reaction rate above and below the fuel assembly 300 is more uniform, thereby reducing the temperature difference above and below the fuel assembly 300, preventing local overheating, thereby extending the service life of the fuel in the fuel assembly 300, and burning the fuel more evenly, improving the overall efficiency of the reactor, and making full use of fuel resources, that is, achieving a relatively homogeneous reaction of the fuel in the fuel assembly 300.

[0047] In detail, in this embodiment, the driving member includes a transmission gear and a driving structure (not shown in the figure), the driving structure is used to drive the transmission gear to rotate, the transmission assembly 200 also includes a plurality of transmission racks 210, the transmission rack 210 includes an assembly surface 211, and the assembly surface 211 is provided with a plurality of meshing teeth extending along the axial direction of the control rod 223, and the meshing teeth are meshed with the transmission gear. Each driving member is connected to a transmission rack 210 through a transmission gear, and one end of the transmission rack 210 is connected to the connecting member 220. The number of transmission racks 210, driving members and connecting members 220 is the same.

[0048] It should be noted that, in this embodiment, the length direction of the transmission rack 210 is parallel to the axial direction of the control rod 223, and the transmission gear can only rotate around its own axis and cannot move in other directions.

[0049] That is to say, in this embodiment, the driving member can drive the transmission gear to rotate and then drive the transmission rack 210 to move along the axis direction of the control rod 223. It can be understood that the driving accuracy of the control rod 223 can be improved through the transmission mode of the rack and the gear.

[0050] Of course, in some other embodiments, the driving member may also include other structures. For example, the driving member may also be a linear driving electric cylinder, a pneumatic cylinder or an oil cylinder. The driving end of the driving electric cylinder, the driving end of the driving cylinder or the driving end of the driving oil cylinder is connected to the connecting member 220. Of course, the driving member may also include a linear guide rail and a screw motor. The screw nut of the screw motor is fixedly connected to the connecting member 220.

[0051] In this embodiment, there are two transmission racks 210 and the two transmission racks 210 are movably connected. The transmission rack 210 is in the shape of a triangular prism. The outer peripheral surface of the transmission rack 210 includes two adjacent assembly surfaces 211 and a fitting surface 212 located between the two assembly surfaces 211. The fitting surfaces 212 of the two transmission racks 210 are relative and can move relative to each other in the axial direction of the control rod.

[0052] It can be understood that since the transmission rack 210 has two assembly surfaces 211, it is convenient for the user to install the transmission gear that meshes with itself. When a driving member connected to a transmission rack 210 has two transmission gears, the two transmission gears can be respectively connected to the meshing teeth of the two assembly surfaces 211, thereby effectively improving the transmission efficiency and transmission stability.

[0053] For example, the two driving members are respectively a first driving member and a second driving member, the first driving member includes a first transmission gear 130 and a second transmission gear 140, the second driving member includes a third transmission gear 150 and a fourth transmission gear 160, the first transmission gear 130 and the second transmission gear 140 are respectively engaged with the meshing teeth on the two assembly surfaces 211 of one of the transmission racks 210, and the third transmission gear 150 and the fourth transmission gear 160 are respectively engaged with the meshing teeth on the two assembly surfaces 211 of the other transmission rack 210.

[0054] It can be understood that in the present application, the first transmission gear 130 and the second transmission gear 140 of the first driving member are respectively engaged with the meshing teeth on the two assembly surfaces 211 of a transmission rack 210, and the third transmission gear 150 and the fourth transmission gear 160 of the second driving member are respectively engaged with the meshing teeth on the two assembly surfaces 211 of another transmission rack 210. Each driving member can drive a transmission rack 210 to move along the axis direction of the control rod 223 through two transmission gears, thereby driving the control rod 223 to move up and down, thereby ensuring the stability of the driving transmission rack 210.

[0055] Of course, in some embodiments, the number of the transmission gear in each driving member may be one, and the transmission gear may be transmission-connected with the meshing teeth on an assembly surface 211 of each transmission rack 210 .

[0056] In detail, in this embodiment, the four assembly surfaces 211 of the two transmission racks 210 are connected in sequence at an angle, that is, the contact surfaces 212 of the two transmission racks 210 are in contact with each other. Any two adjacent assembly surfaces 211 are arranged at an angle of 90 degrees.

[0057] Of course, in some other embodiments, any two assembly surfaces 211 may be arranged at other angles, such as an obtuse angle or an acute angle.

[0058] Optionally, the first driving member may include two independent driving structures, which respectively drive the first transmission gear 130 and the second transmission gear 140 to rotate. Similarly, the second driving member may also include two independent driving structures, which are used to independently drive the third transmission gear 150 and the fourth transmission gear 160 to rotate.

[0059] The detailed driving assembly 100 also includes a driving block, which is provided with a matching hole 101. The inner wall of the matching hole 101 is provided with an assembly groove for installing a transmission gear. Two transmission racks 210 are passed through the matching hole 101. Each transmission gear can rotate around its own axis relative to the driving block. The transmission gears are exposed from the matching hole 101 to facilitate use with the transmission gear.

[0060] In detail, the matching hole 101 in this embodiment is substantially a rectangular hole, two transmission racks 210 pass through the matching hole 101 , and one end of the transmission rack 210 is connected to the connecting member 220 .

[0061] In detail, there are two driving blocks and the two driving blocks are arranged in sequence along the axial direction of the control rod 223. The two driving blocks are respectively a first driving block 110 and a second driving block 120. The matching hole 101 of the first driving block 110 is provided with first assembly grooves 111 on both sides along the first direction. The first transmission gear 130 and the third transmission gear 150 are respectively installed in the two first assembly grooves 111. The matching hole 101 of the second driving block 120 is provided with second assembly grooves 121 on both sides along the second direction. The second transmission gear 140 and the fourth transmission gear 160 are respectively installed in the second assembly grooves 121. The first direction and the second direction form an angle and are both perpendicular to the axial direction of the control rod 223.

[0062] It should be noted that the first driving block 110 and the second driving block 120 can be fixed to an external supporting structure to ensure that the transmission gears in the first driving block 110 and the second driving block 120 can rotate stably.

[0063] It can be understood that in this embodiment, the driving structure is also installed in the driving block, so that the driving structure drives the transmission gear to rotate.

[0064] In detail, in this embodiment, the first direction, the second direction and the axial direction of the control rod 223 are perpendicular to each other.

[0065] It can be understood that the first transmission gear 130 and the second transmission gear 140 of the first driving member are staggered in the axial direction of the control rod 223, that is, the axes of the first transmission gear 130 and the second transmission gear 140 are not in the same horizontal plane. The staggered installation in sequence can avoid interference between the first transmission gear 130 and the second transmission gear 140. Similarly, the third transmission gear 150 and the fourth transmission gear 160 of the second driving member are staggered in the axial direction of the control rod 223, which can also avoid interference between the third transmission gear 150 and the fourth transmission gear 160.

[0066] The mating surface 212 of the transmission rack 210 is provided with a matching groove 213 and a matching protrusion 214, wherein the matching protrusion 214 of one transmission rack 210 is slidably matched with the matching groove 213 of the other transmission rack 210, and the matching groove 213 and the matching protrusion 214 extend along the length direction of the transmission rack 210. In detail, in this embodiment, the matching protrusions 214 in the two transmission racks 210 are slidably matched with the matching grooves 213 in a one-to-one correspondence.

[0067] A first connector 215 is provided at one end of the transmission rack 210 close to the fuel assembly 300, and the connector 220 includes a clamping plate and a second connector 225 connected to each other. The second connector 225 is located on the side of the clamping plate away from the fuel assembly 300 and is connected to the first connector 215. A control rod 223 is installed on the side of the clamping plate close to the fuel assembly 300.

[0068] It should be noted that the connection between the first connector 215 and the second connector 225 can be a detachable connection or a non-detachable connection. For example, the first connector 215 can be provided with an internal thread hole, and the outer peripheral wall of the second connector 225 can be provided with an external thread threadedly connected to the first connector 215. Alternatively, the outer peripheral wall of the first connector 215 can be provided with an external thread, and the second connector 225 can be provided with an internal thread hole threadedly connected to the first connector 215. Alternatively, the first connector 215 and the second connector 225 can also be connected by welding or expansion. It should be noted that in order to facilitate the axial direction of the control rod 223 to be parallel to the height direction, so that the control rod 223 can move along its own axis, when the clamping plate is connected to the transmission rack 210, it is necessary to ensure that the outer side surface of the clamping plate is parallel to the side surface of the transmission rack 210.

[0069] In detail, in the present embodiment, each clamping disk is installed with a plurality of control rods 223. Since the number of connecting members 220 and the number of transmission racks 210 in the present embodiment are both two, the number of control rods 223 on the clamping disks on the two connecting members 220 is the same, and the arrangement of the plurality of control rods 223 on the two clamping disks is roughly symmetrical, and the symmetry may be central symmetry or axial symmetry.

[0070] Specifically, each clamping plate in this embodiment is provided with 12 control rods 223 .

[0071] Of course, in some optional embodiments, the multiple control rods 223 on the two clamping plates can also be arranged in other ways.

[0072] That is to say, the control rods 223 in this embodiment are divided into two groups, and the first driving member and the second driving member respectively drive the two transmission racks 210, thereby respectively driving the control rods 223 on the two connecting members 220 to move along the axis direction of the control rods 223.

[0073] It can be understood that, by setting the matching groove 213 and the matching protrusion 214, the two transmission racks 210 can be facilitated to slide relative to each other in the axial direction of the control rod 223, and the two transmission racks 210 can be facilitated to be positioned and assembled. After the matching protrusion 214 of one transmission rack 210 is slidably matched with the matching groove 213 of the other transmission rack 210, the fitting surfaces 212 in the two transmission racks 210 fit together.

[0074] In detail, the outer peripheral wall of the matching protrusion 214 in this embodiment is an arc wall, and similarly, the inner peripheral wall of the matching groove 213 is an arc inner wall matched with the matching protrusion 214, so as to reduce the friction when the two transmission racks 210 move relative to each other.

[0075] It can be understood that in order to facilitate operators to detect the internal conditions of the fuel assembly 300, a control rod drive mechanism 1 that can adjust power in groups also includes a measuring rod 400. The fitting surface 212 of the transmission rack 210 is provided with a mounting groove. The mounting grooves of the two transmission racks 210 together form a mounting hole 206. The measuring rod 400 passes through the mounting hole 206 and is used to extend into the fuel assembly 300. It should be noted that part of the measuring rod 400 passes through the fuel assembly 300 and is not fixed on the transmission rack 210. Therefore, the measuring rod 400 and the mounting hole 206 are clearance fit. When the transmission rack 210 moves along the axial direction of the control rod 223, it will move relative to the measuring rod 400.

[0076] It should be noted that the length dimension of the control rod 223 in this embodiment may be greater than or equal to the length dimension inside the fuel assembly 300 .

[0077] In detail, the control rod drive mechanism 1 with group-controlled power provided in this embodiment can effectively make the fuel reaction of each part of the fuel assembly 300 uniform by controlling the control rods 223 on the two clamping plates to alternately insert and withdraw the fuel assembly 300.

[0078] Please refer to Figure 5-Figure 6 The clamping plate is provided with a hollow hole, and the hollow hole 226 runs through the upper and lower sides of the clamping plate. The lower side of the clamping plate can be understood as the side of the clamping plate close to the fuel assembly 300, and the upper side of the clamping plate can be understood as the side of the clamping plate close to the first connecting head 215.

[0079] It is understandable that the clamping plate can reduce its own weight through the hollow holes 226 to reduce the load of the drive assembly 100. It should be noted that, since the control rod drive mechanism 1 capable of grouping and regulating power provided in this embodiment drives the control rod 223 to be inserted into the fuel assembly 300 up and down, the heat exchange liquid will flow from bottom to top, and when the heat exchange liquid passes through the clamping plate, since the clamping plate is provided with hollow holes 226, the heat exchange liquid will flow from bottom to top through the hollow holes 226, thereby improving the flow efficiency of the heat exchange liquid and reducing the obstruction of the clamping plate to the heat exchange liquid.

[0080] And through grouping, the two groups of control rods 223 can be reasonably controlled to be inserted into or pulled out of the fuel assembly 300 to regulate the uniform reaction of the fuel assembly 300. For example, the two clamping plates are named the first clamping plate 221 and the second clamping plate 222 respectively.

[0081] It can be understood that in this embodiment, the first clamping plate 221 and the second clamping plate 222 are both provided with a plurality of hollow holes 226. It should be noted that the arrangement of the hollow holes 226 on the first clamping plate 221 and the arrangement of the hollow holes 226 on the second clamping plate 222 can be different or the same, and no specific limitation is made here.

[0082] In detail, in this embodiment, the plane where the axes of the second connectors 225 on the two clamping disks are located is the preset plane 2, the clamping disks are symmetrically arranged about the preset plane 2, and the multiple control rods 223 are symmetrically arranged about the preset plane 2.

[0083] In this embodiment, the outer contour surfaces of the second connector 225 of the first clamping plate 221 and the second connector 225 of the second clamping plate 222 are cylindrical surfaces. The axis of the second connector 225 is parallel to the axis of the control rod 223 .

[0084] That is to say, the axis of the second connecting head 225 of the first clamping plate 221 and the axis of the second connecting head 225 of the second clamping plate 222 in this embodiment are both on the preset plane 2, and the first clamping plate 221 in this embodiment is symmetrical about the preset plane, and the second clamping plate 222 is also symmetrically arranged about the preset plane 2. In detail, all control rods 223 on the first clamping plate 221 and the second clamping plate 222 are symmetrical about the preset plane 2. It can be understood that since the first clamping plate 221 and the second clamping plate 222 are symmetrical about the preset plane 2, and the multiple control rods 223 are also symmetrically arranged about the preset plane 2, it can ensure that the arrangement of the control rods 223 and the first clamping plate 221 and the second clamping plate 222 is more regular, which is convenient for maintenance and overhaul, and the multiple control rods 223 symmetrically arranged about the preset plane 2 can reduce power fluctuations caused by local neutron flux changes and reduce the uneven distribution of transfer flux inside the reactor, improve the stability of reactor combustion, and can enhance the controllability of the device, better control the power output of the reactor, and can also make the fuel burn more evenly in the fuel assembly 300.

[0085] When the two groups of control rods 223 are operating at 1 / 2 full power, the two driving parts can alternately make the control rods 223 on the first clamping plate 221 and the second clamping plate 222 fully inserted into the fuel assembly 300. That is to say, the control rods 223 on the first clamping plate 221 are fully inserted into the fuel assembly 300 in advance, and the control rods 223 on the second clamping plate 222 are not inserted into the fuel assembly 300. Then, the control rods 223 on the first clamping plate 221 are fully pulled out of the fuel assembly 300, and then the control rods 223 on the second clamping plate 222 are fully inserted into the fuel assembly 300, thereby alternating reactions.

[0086] When the two groups of control rods 223 are operating at 1 / 4 full power, the control rods 223 on the first clamping plate 221 and the second clamping plate 222 can be inserted half of their length into the fuel assembly 300 alternately. In other words, the control rods 223 on the first clamping plate 221 can be inserted half of their length into the fuel assembly 300 in advance, and the control rods 223 on the second clamping plate 222 are not inserted into the fuel assembly 300. Then, the control rods 223 on the first clamping plate 221 are completely pulled out of the fuel assembly 300, and then the control rods 223 on the second clamping plate 222 are inserted half of their length into the fuel assembly 300, thereby performing alternating reactions.

[0087] When the two groups of control rods 223 are operating at 3 / 4 full power, the control rod 223 on one of the first clamping plates 221 can be fully inserted into the fuel assembly 300, and the control rod 223 on the second clamping plate 222 can be inserted half of its length into the fuel assembly 300. After a period of time, the control rod 223 on the second clamping plate 222 is inserted half of its length and continues to be inserted until the control rod 223 on the second clamping plate 222 is fully inserted into the fuel assembly 300, and the control rod 223 on the first clamping plate 221 is pulled out half of its length to the outside of the fuel assembly 300, so that only half of the control rod 223 on the first clamping plate 221 is inserted into the fuel assembly 300, thereby alternating reactions.

[0088] In summary, a control rod drive mechanism 1 capable of regulating power in groups provided by an embodiment of the present invention includes a drive assembly 100, a transmission assembly 200 and a fuel assembly 300. The drive assembly 100 includes a plurality of drive members, the transmission assembly 200 includes a plurality of connectors 220, a control rod 223 is mounted on the connector 220, and the fuel assembly 300 is located at one end of the control rod 223 away from the connector 220, wherein the drive member is used to drive the connector 220 to move along the axial direction of the control rod 223 so that the control rod 223 can be inserted into or pulled out of the fuel assembly 300. By driving the control rods 223 in groups, the control rods 223 corresponding to different regions of the fuel assembly 300 can be independently adjusted, and the positions of the control rods 223 of different groups relative to the fuel assembly 300 in their own axial direction can be adjusted according to the actual reaction conditions above and below the fuel assembly 300, so that the fuel can be burned more evenly, the overall efficiency of the reactor can be improved, and the fuel resources can be fully utilized, that is, the fuel in the fuel assembly 300 can be relatively homogeneous. Reaction.

[0089] 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 control rod drive mechanism capable of regulating power in groups, characterized in that: include: A drive assembly (100), the drive assembly (100) comprising a plurality of drive members; A transmission assembly (200), the transmission assembly (200) comprising a plurality of connecting members (220), a control rod (223) being mounted on the connecting member (220), and each of the connecting members (220) being connected to one of the driving members; a fuel assembly (300), the fuel assembly (300) being located at an end of the control rod (223) away from the connecting piece (220); The driving member is used to drive the connecting member (220) to move along the axial direction of the control rod (223) so that the control rod (223) can be inserted into or pulled out of the fuel assembly (300).

2. A control rod drive mechanism capable of group-controlled power according to claim 1, characterized in that: The driving member includes a transmission gear and a driving structure, and the driving structure is used to drive the transmission gear to rotate; The transmission assembly (200) further comprises a plurality of transmission racks (210), wherein the transmission racks (210) comprise an assembly surface (211), wherein the assembly surface (211) is provided with a plurality of meshing teeth extending along the axis direction of the control rod (223), and the meshing teeth are meshed with the transmission gear, wherein each of the driving members is transmission-connected to a transmission rack (210) via the transmission gear, wherein one end of the transmission rack (210) is connected to the connecting member (220), and the number of the transmission racks (210), the driving members and the connecting member (220) is the same.

3. The control rod drive mechanism capable of group-adjusting power according to claim 2, characterized in that: The number of the transmission racks (210) is two and the two transmission racks (210) are movably connected. The transmission racks (210) are in the shape of a triangular prism. The outer peripheral surface of the transmission rack (210) includes two adjacent assembly surfaces (211) and a fitting surface (212) located between the two assembly surfaces (211). The fitting surfaces (212) of the two transmission racks (210) are relative and can move relative to each other in the axial direction of the control rod (223).

4. The control rod drive mechanism capable of group-adjusting power according to claim 3, characterized in that: The four assembly surfaces (211) on the two transmission racks (210) are sequentially connected at an angle, and any two adjacent assembly surfaces (211) are arranged at an angle of 90 degrees.

5. The control rod drive mechanism capable of group-controlled power according to claim 3, characterized in that: The two driving members are respectively a first driving member and a second driving member, the first driving member comprises a first transmission gear (130) and a second transmission gear (140), the second driving member comprises a third transmission gear (150) and a fourth transmission gear (160), the first transmission gear (130) and the second transmission gear (140) respectively mesh with meshing teeth on two assembly surfaces (211) of one of the transmission racks (210), and the third transmission gear (150) and the fourth transmission gear (160) respectively mesh with meshing teeth on two assembly surfaces (211) of the other transmission rack (210).

6. The control rod drive mechanism capable of group-adjusting power according to claim 5, characterized in that: The driving assembly (100) further comprises a driving block, the driving block is provided with a matching hole (101), the inner wall of the matching hole (101) is provided with an assembly groove for mounting the transmission gear, the two transmission racks (210) are passed through the matching hole (101), each of the transmission gears can rotate around its own axis relative to the driving block, and the transmission gears are all exposed from the matching hole (101).

7. The control rod drive mechanism capable of group-adjusting power according to claim 6, characterized in that: The number of the driving blocks is two and the two driving blocks are arranged in sequence along the axial direction of the control rod (223). The two driving blocks are respectively a first driving block (110) and a second driving block (120). The matching hole (101) of the first driving block (110) is provided with first assembly grooves (111) on both sides along the first direction. The first transmission gear (130) and the third transmission gear (150) are respectively installed in the two first assembly grooves (111). The matching hole (101) of the second driving block (120) is provided with second assembly grooves (121) on both sides along the second direction. The second transmission gear (140) and the fourth transmission gear (160) are respectively installed in the two second assembly grooves (121). The first direction and the second direction form an angle and are both perpendicular to the axial direction of the control rod (223).

8. The control rod drive mechanism capable of group-controlled power according to claim 3, characterized in that: The mating surface (212) of the transmission rack (210) is provided with a mating groove (213) and a mating protrusion (214), wherein the mating protrusion (214) of one transmission rack (210) is slidably mated with the mating groove (213) of the other transmission rack (210), and the mating groove (213) and the mating protrusion (214) extend along the length direction of the transmission rack (210).

9. The control rod drive mechanism capable of group-adjusting power according to claim 8, characterized in that: The mating surface (212) of the transmission rack (210) is provided with a mounting groove, and the mounting grooves of the two transmission racks (210) together form a mounting hole (206). The control rod drive mechanism capable of group-adjusting power further comprises a measuring rod (400), and the measuring rod (400) passes through the mounting hole (206) and is used to extend into the fuel assembly (300).

10. The control rod drive mechanism capable of group-controlled power according to claim 3, characterized in that: A first connector (215) is provided at one end of the transmission rack (210) close to the fuel assembly (300); the connector (220) comprises a clamping plate and a second connector (225) connected to each other; the second connector (225) is located on a side of the clamping plate away from the fuel assembly (300) and connected to the first connector (215); a control rod (223) is installed on a side of the clamping plate close to the fuel assembly (300); The clamping plate is provided with a hollow hole (226), and the hollow hole (226) runs through the upper and lower sides of the clamping plate; The plane where the axes of the second connectors (225) on the two clamping disks lie is a preset plane (2), the clamping disks are symmetrically arranged about the preset plane (2), and the plurality of control rods (223) are symmetrically arranged about the preset plane (2).

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