Control rod drive mechanism and roller nut structure

Abstract

The application discloses a control rod drive mechanism and a roller nut structure, wherein the roller nut structure comprises a main armature, an auxiliary armature and a drive column, the main armature is provided with a containing space on one side close to the drive column; the auxiliary armature is located at one end of the main armature and can move close to or away from the main armature; the drive column is provided with a rolling disc arranged in a circumferential direction on the outer side of the drive column and is located in the containing space; the end of the drive column is connected with the auxiliary armature through a sliding component; when the auxiliary armature moves close to the main armature, the first radial force is applied to the drive column through the sliding component, and the drive column can move to a first position; when the auxiliary armature moves away from the main armature, the second radial force is applied to the drive column through the sliding component, and the drive column moves to a second position; the rolling disc is engaged with the spiral groove when the drive column is in the first position; and the rolling disc is disengaged from the spiral groove when the drive column is in the second position. In the scheme, the overall structure of the control rod drive mechanism is simplified, and the control rod drive mechanism is more suitable for application in small-sized reactors.

Description

Technical Field

[0001] This invention relates to the field of control rod drive mechanism technology for nuclear power reactors, and more specifically, to a control rod drive mechanism and roller nut structure. Background Technology

[0002] In some types of nuclear reactors, such as pressurized water reactors, the nuclear reaction rate is controlled by the movement of control rods. These control rods, which consist of neutron-absorbing material, are designed to be inserted into the reactor core. The deeper the control rods are inserted into the core, the more neutrons are absorbed, and thus the greater the decrease in the nuclear reaction rate. Therefore, controlling the insertion depth of the control rods controls the reactivity of the reactor.

[0003] In emergency situations, control rods need to be fully inserted into the reactor to quickly stop the nuclear reaction. Currently, pressurized water reactors (PWRs) operating domestically and internationally primarily employ three types of control rod drive mechanisms: rack and pinion, screw-roller-nut, and magnetically driven step-by-step. The screw-roller-nut type uses a screw, roller, and nut to drive the nut, controlling the axial movement of the screw and thus controlling the insertion depth of the control rod into the reactor.

[0004] For example, CN105788668A discloses a control rod drive mechanism with a separable nut drive, including a separable nut component. The separable nut component consists of a separable nut, multiple connecting rods, an armature, and a release spring, and is fitted inside the motor pressure-bearing housing. Two of the connecting rods are identical. These two identical connecting rods, a connecting rod for connecting the rotor shaft sleeve, the armature, and the separable nut constitute a single-degree-of-freedom linkage mechanism with a parallelogram structure. The position of the separable nut is controlled by the up-and-down movement of the armature. The drive screw component consists of a core rod, a drive screw, a positioning block, a drop spring, and a guide block. One end of the drive screw is connected to the control rod assembly. In this design, the separable nut rotates to drive the screw in linear motion, enabling the insertion, removal from the reactor core, and position holding functions of the control rod assembly under various reactor operating conditions. When an emergency power outage occurs, the drive screw cannot move. At this time, the armature is ejected, and the armature is pulled by the connecting rod to separate the nut, disengaging from the drive screw. Under the action of the drop bar spring, the drive screw quickly pushes the control rod assembly into the reactor core.

[0005] In this design, in an emergency, the nut can be pulled apart by the connecting rod, disengaging it from the drive screw and thus allowing the rod to fall. However, the connecting rod mechanism has many parts and kinematic pairs, resulting in high structural complexity, low space utilization, and the transmission uncertainty easily introduced by the gaps between multiple kinematic pairs, making it unsuitable for small reactors with limited space. Summary of the Invention

[0006] This invention provides a control rod drive mechanism and a roller nut structure. This solution simplifies the structure of the control rod drive mechanism, facilitates miniaturization, and ensures reliable rod dropping in emergency situations.

[0007] To achieve the above objectives, the technical solution provided by the present invention is as follows: A roller nut structure for mating with a drive rod having a helical groove on its outer side includes a main armature, an auxiliary armature, and a drive rod. The main armature is used to be sleeved on the outside of the drive rod, and a receiving space is provided on the side near the drive rod; The auxiliary armature has at least one, located at one end of the main armature, and is capable of moving toward or away from the main armature; The drive column has at least one, with a circumferentially arranged rolling disk on its outer side, and the drive column is located in the receiving space; The end of the drive column is connected to the auxiliary armature via a sliding assembly. The auxiliary armature is configured such that when it moves closer to the main armature, the sliding assembly applies a first radial force to the drive column, allowing the drive column to move closer to the drive rod to a first position; when it moves away from the main armature, the sliding assembly applies a second radial force to the drive column, allowing the drive column to move away from the drive rod to a second position. The first position of the drive column is configured such that the rolling disk and the helical groove are engaged; the second position is configured such that the rolling disk and the helical groove are disengaged.

[0008] In this design, when the auxiliary armature and the main armature approach each other, the sliding assembly applies a first radial force to the drive column, with the direction of the first radial force towards the drive rod, thereby moving the drive column closer to the drive rod to a first position. At the first position, the rolling disk on the drive column engages with the helical groove, enabling the drive rod to move up and down. When the auxiliary armature and the main armature move away from each other, the sliding assembly applies a second radial force to the drive column, with the direction of the second radial force away from the drive rod, thereby moving the drive column away from the drive rod to a second position. At the second position, the rolling disk on the drive column disengages from the helical groove. At this time, the drive rod is freed from the constraint of the roller nut structure, so that in an emergency, the roller nut structure can perform an emergency drop of the control rod, allowing the control rod to be fully inserted into the core reactor. This roller nut structure mainly includes a main armature, an auxiliary armature, and a drive column. By moving the drive column to different positions through the relative movement between the main armature and the auxiliary armature, the drive rod is controlled, greatly reducing the number of parts in the control rod drive mechanism, simplifying the overall structure of the control rod drive mechanism, and making it more suitable for small reactor applications.

[0009] As a further improvement, when the auxiliary armature moves closer to or further away from the main armature, the sliding assembly pushes or pulls the drive column to apply an axial force, and simultaneously applies a first radial force or a second radial force to the drive column. By applying the first or second radial force to the drive column through the sliding assembly when the auxiliary armature moves, the movement of the drive column can be controlled, reducing the control path for the drive column. As a further improvement, the sliding assembly includes a sliding unit rotatably connected to the drive column and a second sliding unit connected to the auxiliary armature; when the auxiliary armature moves closer to or further away from the main armature, the sliding unit and the second sliding unit slide relative to each other, and the sliding trajectory is inclined relative to the axial direction of the drive rod. The relative sliding between the sliding unit and the second sliding unit forms a sliding trajectory, which is inclined relative to the axial direction of the drive rod, thereby enabling the sliding assembly to apply a first radial force or a second radial force to the drive column when the auxiliary armature moves.

[0010] As a further improvement, the sliding unit includes a sliding block, and the second sliding unit is a sliding space disposed on the auxiliary armature; the sliding block is located in the sliding space and moves relative to the sliding space. A sliding groove is formed at the bottom of the sliding space, and the sliding block is connected to the sliding groove; the inclination direction of the connecting surface between the sliding block and the sliding groove is consistent with the sliding trajectory. The sliding block and the sliding groove are connected, and the inclination direction of the connecting surface between the sliding block and the sliding groove is consistent with the sliding trajectory, generating a driving force between the sliding block and the sliding groove, thereby realizing the movement of the driving column, resulting in a simple structure.

[0011] As a further improvement, the rolling disk is configured without a helical angle in the circumferential direction.

[0012] As a further improvement, the drive column is integrally molded. This integral molding creates a drive column structure with rolling discs, increasing the structural strength of the drive column, avoiding assembly errors caused by separate assembly, better ensuring the positional accuracy between the rolling discs, and improving the fit between the rolling discs and the helical groove.

[0013] As a further improvement, an electromagnetic coil is provided on the outside of the main armature; when the electromagnetic coil is energized, the main armature and the auxiliary armature are attracted, and the auxiliary armature moves closer to the main armature; when the electromagnetic coil is de-energized, the main armature and the auxiliary armature are disconnected, and the auxiliary armature moves away from the main armature. By controlling the energization and de-energization of the electromagnetic coil, the movement of the auxiliary armature closer to the main armature or away from the main armature is controlled, thereby correspondingly controlling the different positions of the drive column and simplifying the drive setting method for the movement of the drive column.

[0014] As a further improvement, an elastic element is provided between the main armature and the auxiliary armature. This elastic element is configured to cause the auxiliary armature to move away from the main armature when the main armature and the auxiliary armature are disconnected. In the event of an emergency power failure, the elastic element also applies an elastic force to the auxiliary armature. Under the action of this elastic force, the auxiliary armature can move away from the main armature, thereby moving the drive column to the second position, thus enabling a timely response to the emergency drop bar.

[0015] This application also provides a control rod drive mechanism, including a drive lever and any of the roller nut structures described above. The drive lever passes through the main armature and is arranged along the axial direction of the main armature. When the roller nut structure rotates, it can drive the drive lever to move along its axial direction. The control rod drive structure also possesses the beneficial effects of the other roller nut structures described above.

[0016] Other technical problems that the control rod drive mechanism and roller nut structure of the present invention can solve, other technical features contained in the technical solution, and the advantages brought by these technical features will be further described in detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the control rod drive mechanism; Figure 2 This is a cross-sectional view of the control rod drive mechanism when the drive column is in the first position. Figure 3 for Figure 2 Enlarged view of point B in the middle; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a cross-sectional view of the control rod drive mechanism when the drive column is in the second position. Figure 6 This is a schematic diagram of a roller nut structure; Figure 7 This is a schematic diagram of the drive column structure; Figure 8 This is a schematic diagram of the first armature structure.

[0018] Label Explanation: 1. Drive bar; 101. Helical groove; 2. Driver components; 201. Outer casing; 202. Electromagnetic coil; 203. First bearing; 204. Main armature; 2041. Connecting post; 2042. Elastic element; 2043. Accommodation space; 205. Drive column; 2051. Rolling disc; 206. First armature; 2061. Sliding space; 2062. Drive tooth; 2063. Sliding groove; 2064. Connecting groove; 207. Second armature; 208. Sliding unit; 2081. Sliding block; 2082. Receiving groove; 2083. Second bearing; 2084. Stop; 2085. Limiting part. Detailed Implementation

[0019] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0020] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0022] In this application, the terms "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0023] like Figure 1 and Figure 2As shown, this invention provides a control rod drive mechanism applied in a nuclear reactor to control the insertion depth of control rods into the core. This drive mechanism controls the insertion depth of the control rods into the core; the deeper the control rods are inserted, the more neutrons are absorbed, thus reducing the nuclear reaction rate. Furthermore, in emergency situations, the control mechanism also needs to perform an emergency drop operation to ensure the control rods are fully inserted into the core.

[0024] The present invention also provides a roller nut structure for engaging with the drive rod 1. When the structure rotates, it controls the drive rod 1 to move along its axial direction.

[0025] Specifically, the drive rod 1 is vertically positioned, and a spiral groove 101 is formed on the outer side of the drive rod 1. The spiral groove 101 is continuously arranged.

[0026] like Figure 2 and Figure 3 As shown, a roller nut structure includes a main armature 204, an auxiliary armature, and a drive post 205. The main armature 204 is sleeved on the outside of a drive rod 1, and a receiving space 2043 is provided on the side of the main armature 204 near the drive rod 1. At least one auxiliary armature is located at one end of the main armature 204 and can move towards or away from the main armature 204. At least one drive post 205 is provided, and a circumferentially arranged rolling disk 2051 is provided on the outside of the drive post 205. The drive post 205 is located within the receiving space 2043.

[0027] Furthermore, the end of the drive column 205 is connected to the auxiliary armature via a sliding assembly. The auxiliary armature is configured such that, when it moves closer to the main armature 204, it can apply a first radial force to the drive column 205 via the sliding assembly, causing the drive column 205 to move closer to the drive rod 1 to a first position; when it moves away from the main armature 204, it can apply a second radial force to the drive column 205 via the sliding assembly, causing the drive column 205 to move away from the drive rod 1 to a second position. The first position of the drive column 205 is configured such that the rolling disk 2051 and the helical groove 101 are engaged; the second position is configured such that the rolling disk 2051 and the helical groove 101 are disengaged.

[0028] In this embodiment, two auxiliary armatures are provided, namely the first armature 206 and the second armature 207, which are sleeved on the drive rod 1 and respectively set on the upper and lower sides of the main armature 204 (within the range of...). Figure 2 (Taking the middle view as an example). Both ends of the drive column 205 are connected to the auxiliary armature via sliding assemblies. See... Figure 2As shown, when the auxiliary armature and the main armature 204 approach each other, the sliding assembly applies a first radial force to the drive column 205. The direction of the first radial force is towards the drive rod 1, thereby causing the drive column 205 to move closer to the drive rod 1 to a first position. At the first position, the rolling disk 2051 on the drive column 205 meshes with the helical groove 101. At this time, when the roller nut structure is driven to rotate, the meshing of the rolling disk 2051 and the helical groove 101 can drive the drive rod 1 to move up and down.

[0029] See Figure 5 As shown, when the auxiliary armature and the main armature 204 move away from each other, the sliding assembly applies a second radial force to the drive column 205. The direction of the second radial force is opposite to that of the drive rod 1, thereby moving the drive column 205 away from the drive rod 1 to a second position. At the second position, the rolling disk 2051 on the drive column 205 disengages from the helical groove 101. At this time, the drive rod 1 is freed from the constraint of the roller nut structure, so that in an emergency, the roller nut structure can perform an emergency drop of the control rod, allowing the control rod to be fully inserted into the core assembly.

[0030] See Figure 2 and Figure 3 As shown, when the auxiliary armature moves closer to or further away from the main armature 204, it applies an axial force to the drive column 205 by pushing or pulling through the sliding assembly, and at the same time applies a first radial force or a second radial force to the drive column 205.

[0031] Specifically, when the auxiliary armature moves closer to the main armature 204, it pushes the drive rod 1 through the sliding assembly, thereby applying an axial force toward the drive column 205 and simultaneously applying a first radial force to the drive column 205. Since the axial forces at both ends of the drive column 205 are balanced, the drive column 205 only moves closer to the drive rod 1. When the auxiliary armature moves away from the main armature 204, it pulls the drive rod 1 through the sliding assembly, thereby applying an axial force away from the drive column 205 and simultaneously applying a second radial force to the drive column 205. Since the axial forces at both ends of the drive column 205 are balanced, the drive column 205 only moves away from the drive rod 1.

[0032] Furthermore, the sliding assembly includes a sliding unit 208 rotatably connected to the drive column 205 and a second sliding unit connected to the auxiliary armature; when the auxiliary armature moves closer to or further away from the main armature 204, the sliding unit 208 and the second sliding unit slide relative to each other, and the sliding trajectory is inclined relative to the axial direction of the drive rod 1.

[0033] The sliding unit 208 and the second sliding unit are connected in cooperation. When the auxiliary armature moves closer to or away from the main armature 204, relative sliding occurs between the sliding unit 208 and the second sliding unit. During the sliding process, the second sliding unit applies a driving force perpendicular to the sliding trajectory to the sliding unit 208. This driving force is decomposed into an axial force toward or away from the drive column 205, and a first radial force or a second radial force.

[0034] See Figure 3 and Figure 4 As shown, in a preferred embodiment, the included angle α between the two sliding trajectories of the sliding components at both ends of the drive column 205 and the drive rod 1 is less than 180°, and the upper and lower sliding components have the same structure.

[0035] See Figure 4 In this description, the sliding assembly at the upper end of the drive column 205 and the first armature 206 are used as examples. When the auxiliary armature moves closer to the main armature 204, during the sliding process, the second sliding unit applies a driving force perpendicular to the sliding trajectory to the sliding unit 208. This driving force is decomposed into an axial force toward the drive column 205 and a first radial force toward the drive rod 1. See... Figure 4 During the sliding process, the second sliding unit applies a driving force F perpendicular to the sliding trajectory to the sliding unit 208. This driving force is decomposed into an axial force F2 toward the driving post 205 and a first radial force F1 toward the driving rod 1. Similarly, when the auxiliary armature moves away from the main armature 204, the driving force is decomposed into an axial force away from the driving post 205 and a second radial force away from the driving rod 1.

[0036] In this embodiment, combined with Figure 6 , Figure 7 and Figure 8 As shown, the sliding unit 208 includes a sliding block 2081, and the second sliding unit is a sliding space 2061 disposed on the auxiliary armature; the sliding block 2081 is located in the sliding space 2061, and the sliding block 2081 moves relative to the sliding space 2061. Further, a sliding groove 2063 is formed at the bottom of the sliding space 2061, and the sliding block 2081 is connected to the sliding groove 2063. The inclination direction of the connecting surface between the sliding block 2081 and the sliding groove 2063 is consistent with the sliding trajectory.

[0037] To prevent the sliding block 2081 from disengaging from the sliding groove 2063 during relative movement, limiting portions 2085 are provided protruding from both sides of the sliding block 2081 along the sliding direction. Limiting grooves are recessed from both sides of the sliding groove 2063 along the sliding direction. When the sliding block 2081 and the sliding groove 2063 are engaged, the limiting portions 2085 simultaneously engage and lock into the limiting grooves, preventing the sliding block 2081 from disengaging from the sliding groove 2063.

[0038] The drive column 205 is rotatably connected to the sliding unit 208. As one specific embodiment, see... Figure 4 As shown, a receiving groove 2082 is formed on the side of the sliding unit 208 near the drive column 205. A second bearing 2083 is provided between the side wall of the receiving groove 2082 and the end side of the drive column 205, so that the drive column 205 and the sliding unit 208 are rotatably connected. In order to fix the second bearing 2083, a stop 2084 is engaged on the inner side wall of the receiving groove 2082, and a limiting step is provided on the end side of the drive column 205. On the side of the second bearing 2083 near the drive column 205, the outer ring of the second bearing 2083 abuts against the stop 2084, and the inner ring abuts against the limiting step.

[0039] Combination Figure 3 and Figure 7 As shown, several rolling disks 2051 are spaced apart along the axial direction on the drive column 205. The rolling disks 2051 have no helical angle in the circumferential direction, which makes the operation between the drive column 205 and the drive rod 1 more stable. At the same time, the outer peripheral sidewall of the rolling disk 2051 is an arc surface, which matches the shape of the helical groove 101, and can better mesh and transmit power with the helical groove 101.

[0040] As a preferred embodiment, the drive column 205 is integrally molded. This integral molding creates a drive column 205 structure with rolling discs 2051, improving the structural strength of the drive column 205, avoiding assembly errors caused by separate assembly, better ensuring the position of each rolling disc 2051, and improving the fitting accuracy between the rolling discs 2051 and the helical groove 101.

[0041] Figure 6 As shown, when multiple drive columns 205 are provided, they are arranged in an array spaced apart around the axial center of the drive rod 1. In one specific embodiment, three drive columns 205 are provided. Simultaneously, the main armature 204 has a corresponding number of receiving spaces 2043 on the side near the drive rod 1, with each drive column 205 located within one receiving space 2043. This arrangement allows the drive columns 205 to be located inside the main armature 204, making the roller nut structure more compact. Furthermore, the receiving spaces 2043 provide a radial movement channel for the drive columns 205, allowing them to move smoothly towards or away from the drive rod 1 within the receiving spaces 2043 without structural interference.

[0042] It should also be noted that the accommodating spaces 2043 can be spaced out, corresponding to the number of drive columns 205. The accommodating spaces 2043 can also be arranged continuously, with the entire inner side of the main armature 204 having its own accommodating space.

[0043] See Figure 2As shown, an electromagnetic coil 202 is provided on the outside of the main armature 204. The electromagnetic coil 202 is housed in the outer casing 201, which protects the electromagnetic coil 202. When the electromagnetic coil 202 is energized, the main armature 204 and the auxiliary armature are attracted under the action of the electromagnetic coil 202, and the auxiliary armature moves closer to the main armature 204. When the electromagnetic coil 202 is de-energized, the main armature 204 and the auxiliary armature are disconnected, and the auxiliary armature moves away from the main armature 204.

[0044] Furthermore, an elastic element 2042 is provided between the main armature 204 and the auxiliary armature. The elastic element 2042 is configured to move the auxiliary armature away from the main armature 204 when the main armature 204 and the auxiliary armature are disconnected.

[0045] Combination Figure 6 and Figure 8 As shown, the auxiliary armature and the main armature 204 are movably connected. As a specific connection method between the auxiliary armature and the main armature 204, several connecting posts 2041 are provided on the side of the main armature 204 near the auxiliary armature. A protruding limiting block is provided on the circumferential outer side of the end of each connecting post 2041 near the auxiliary armature. Several connecting slots 2064 are provided on the side of the auxiliary armature near the main armature 204. The number and position of the connecting slots 2064 correspond to the connecting posts 2041, so that one connecting post 2041 is matched with one connecting slot 2064. A limiting step protrudes from the inner wall of the end of the connecting slot 2064 near the main armature 204.

[0046] Figure 5 The image shows an installation method for the connecting post 2041. Taking the second armature 207 on the lower side as an example, a mounting hole is opened at the corresponding position on the second armature 207, and the connecting post 2041 is fixedly connected to the main armature 204 through the mounting hole.

[0047] Additionally, an elastic element 2042 is provided between the main armature 204 and the auxiliary armature. The elastic element 2042 can be a spring. The elastic element 2042 can be sleeved on the connecting post 2041, so that one end of the elastic element 2042 can abut against the auxiliary armature and the other end can abut against the main armature 204.

[0048] When the electromagnetic coil 202 is energized, the main armature 204 and the auxiliary armature are attracted together under the action of the electromagnetic coil 202, and the auxiliary armature moves closer to the main armature 204. When the electromagnetic coil 202 is de-energized, the main armature 204 and the auxiliary armature are disconnected, and the auxiliary armature moves away from the main armature 204 under the action of the elastic element 2042.

[0049] In order to limit the relative positions between the main armature 204 and the auxiliary armature, the auxiliary armature moves away from the main armature 204 until the limiting block on the connecting post 2041 abuts against the limiting step on the connecting groove 2064, thereby preventing the main armature 204 and the auxiliary armature from separating.

[0050] Regarding the rotation of the roller nut structure, as a specific implementation, one of the auxiliary armatures is provided with a drive tooth 2062, which is connected to a drive component. The drive component can be any existing drive structure, such as a drive motor, to drive the roller nut structure to rotate.

[0051] In this embodiment, during normal operation, the electromagnetic coil 202 is energized, the main armature 204 and the auxiliary armature are attracted, and the auxiliary armature moves closer to the main armature 204. The sliding assembly applies a first radial force to the drive column 205, causing the drive column 205 to move closer to the drive rod 1 to a first position. The rolling disk 2051 on the drive column 205 meshes with the helical groove 101. At this time, when the roller nut structure is driven to rotate, the meshing of the rolling disk 2051 and the helical groove 101 can drive the drive rod 1 to move up and down.

[0052] In an emergency, when the electromagnetic coil 202 is de-energized, the main armature 204 and the auxiliary armature disconnect. Under the action of the elastic element 2042, the auxiliary armature moves away from the main armature 204. The sliding assembly applies a second radial force to the drive column 205, causing the drive column 205 to move away from the drive rod 1 to the second position. The rolling disk 2051 on the drive column 205 disengages from the helical groove 101. At this time, the drive rod 1 is released from the constraint of the roller nut structure and falls, allowing the control rod to be fully inserted into the core assembly.

[0053] This application also provides a control rod drive mechanism, including a drive rod 1 and a drive assembly 2. The drive assembly 2 includes the roller nut structure. The drive rod 1 passes through the main armature 204 and is arranged along the axial direction of the main armature 204. When the roller nut structure rotates, it can drive the drive rod 1 to move along its axial direction.

[0054] Unless otherwise specified, the terms "installation," "setup," "equipped with," and "connection" used herein should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0055] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A roller nut structure, characterized in that: For connection with a drive rod (1) having a spiral groove (101) on the outside, including, The main armature (204) is used to be sleeved on the outside of the drive rod (1), and a receiving space (2043) is provided on the side near the drive rod (1). A secondary armature, having at least one, is located at one end of the main armature (204) and is capable of moving toward or away from the main armature (204); The drive column (205) has at least one circumferentially arranged rolling disk (2051) on its outer side, and the drive column (205) is located in the receiving space (2043); The end of the drive column (205) is connected to the auxiliary armature via a sliding assembly. The auxiliary armature is configured such that when it moves closer to the main armature (204), a first radial force is applied to the drive column (205) via the sliding assembly, and the drive column (205) can move closer to the drive rod (1) to a first position; when it moves away from the main armature (204), a second radial force is applied to the drive column (205) via the sliding assembly, and the drive column (205) can move away from the drive rod (1) to a second position. The first position of the drive column (205) is configured such that the rolling disk (2051) and the helical groove (101) are engaged with each other; the second position is configured such that the rolling disk (2051) and the helical groove (101) are disengaged from each other.

2. The roller nut structure according to claim 1, characterized in that: When the auxiliary armature moves closer to or further away from the main armature (204), it applies an axial force to the drive column (205) by pushing or pulling through the sliding assembly, and at the same time applies a first radial force or a second radial force to the drive column (205).

3. The roller nut structure according to claim 2, characterized in that: The sliding assembly includes a sliding unit (208) rotatably connected to the drive column (205) and a second sliding unit connected to the auxiliary armature; when the auxiliary armature moves closer to or further away from the main armature (204), the sliding unit (208) and the second sliding unit slide relative to each other, and the sliding trajectory is inclined relative to the axial direction of the drive rod (1).

4. The roller nut structure according to claim 3, characterized in that: The sliding unit (208) includes a sliding block (2081), and the second sliding unit is a sliding space (2061) disposed on the auxiliary armature; the sliding block (2081) is located in the sliding space (2061), and the sliding block (2081) moves relative to the sliding space (2061).

5. The roller nut structure according to claim 4, characterized in that: The sliding space (2061) has a sliding groove (2063) at the bottom, and the sliding block (2081) is connected to the sliding groove (2063). The inclination direction of the connecting surface of the sliding block (2081) and the sliding groove (2063) is consistent with the sliding trajectory.

6. The roller nut structure according to any one of claims 1-5, characterized in that: The rolling disk (2051) has no helical angle when it is circumferentially set.

7. The roller nut structure according to claim 6, characterized in that: The drive column (205) is integrally molded.

8. The roller nut structure according to any one of claims 1-5, characterized in that: An electromagnetic coil (202) is provided on the outside of the main armature (204); When the electromagnetic coil (202) is energized, the main armature (204) and the auxiliary armature are attracted together, and the auxiliary armature moves closer to the main armature (204); when the electromagnetic coil (202) is de-energized, the main armature (204) and the auxiliary armature are disconnected, and the auxiliary armature moves away from the main armature (204).

9. The roller nut structure according to claim 8, characterized in that: An elastic element (2042) is provided between the main armature (204) and the auxiliary armature. The elastic element (2042) is configured to move the auxiliary armature away from the main armature (204) when the main armature (204) and the auxiliary armature are disconnected.

10. A control rod drive mechanism, characterized in that: It includes a drive bar (1) and a drive assembly (2), wherein the drive assembly (2) includes a roller nut structure as described in any one of claims 1-9, the drive bar (1) is inserted in the main armature (204) and is arranged axially along the main armature (204), and the roller nut structure can drive the drive bar (1) to move along its axial direction when it rotates.

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