A connection device, a nuclear reactor control system, and a nuclear reactor

Abstract

The present invention discloses a connection device, a nuclear reactor control system and a nuclear reactor. The connection device is used to connect a control rod and a driving mechanism, and includes a connecting rod and a first locking assembly. A central channel is opened in the main driving shaft of the driving mechanism along its axial direction. The connecting rod is arranged in the central channel. The first locking assembly includes a hook arranged at the end of the connecting rod and a countersunk hole arranged at the end of the control rod. A slot is arranged in the countersunk hole. The shape of the slot is adapted to the hook. The hook can be inserted into the countersunk hole and connected with the slot, thereby locking the axial displacement of the main driving shaft and the control rod. The connection device can realize the adjustment of the lateral spatial position of the control rod.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear industry, and in particular relates to a connecting device, a nuclear reactor control system comprising the connecting device, and a nuclear reactor. Background Art

[0002] The control rod drive mechanism of a nuclear reactor is an important device in the core reactivity control system and core protection system of a nuclear reactor. It can realize the operation and safety functions of the reactor such as startup, power regulation, normal shutdown and emergency shutdown by adjusting the spatial position, speed and acceleration of the control rods in the reactor core.

[0003] Currently, nuclear reactors commonly use control rod and drive mechanism connection structures such as spring-pushed release rod expansion clamping and pin-shaft chain connection. However, these connection structures are typically installed at the top or bottom of a vertical reactor core and can only achieve vertical movement of the control rod. When the reactor core requires a horizontal (or non-vertical) arrangement due to certain special requirements (such as height space limitations, or applications such as vehicle, ship, or aircraft), or in zero-gravity or microgravity conditions, the existing control rod and drive mechanism connection structures are either unsuitable for installation in the horizontal position of the horizontal core or are non-rigid connections, making it impossible to adjust the control rod's lateral spatial position (or non-vertical position) and unable to control the control rod's axial and axial position. Therefore, for horizontal reactors or scenarios requiring horizontal (or non-vertical) adjustment of the control rod, the existing connection structures are no longer suitable. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art and to provide a connecting device, a nuclear reactor control system and a nuclear reactor including the connecting device, wherein the connecting device can realize the adjustment of the lateral spatial position of the control rod.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A connecting device for connecting a control rod and a drive mechanism, comprising a connecting rod and a first locking assembly. A central channel is opened in the axial direction of a main drive shaft of the drive mechanism, and the connecting rod is arranged in the central channel. The first locking assembly includes a hook arranged at the end of the connecting rod and a countersunk hole arranged at the end of the control rod. A slot is provided in the countersunk hole, and the shape of the slot is adapted to the hook. The hook can extend into the countersunk hole and connect with the slot, thereby locking the axial displacement of the main drive shaft and the control rod.

[0007] Preferably, the connecting device further comprises a second locking assembly, the second locking assembly comprising a tenon and a groove, the tenon being provided at the end of the main drive shaft, the groove being provided at the end of the control rod, the shape of the tenon being adapted to the groove, the tenon extending into the groove, thereby locking the circumferential rotation and radial displacement of the main drive shaft and the control rod.

[0008] Preferably, there are multiple tenons, which are evenly distributed along the circumference of the main drive shaft. The number of the grooves is consistent with the number of the tenons, and the multiple grooves are evenly distributed along the circumference of the control rod end and correspond to the positions of the various tenons.

[0009] Preferably, the tenon point is arranged on the outside of the central channel, and the groove is arranged on the outside of the countersunk hole.

[0010] The present invention also provides a nuclear reactor control system, comprising control rods and a drive mechanism, and also comprising the above-mentioned connecting device.

[0011] Preferably, the nuclear reactor control system further comprises a pressure shell, the drive mechanism comprises a main drive shaft, and the control rods, the main drive shaft and the connecting device are all arranged inside the pressure shell.

[0012] Preferably, the nuclear reactor control system further includes a linear bearing group, two of which are provided. The two linear bearing groups are arranged inside the pressure shell, and the main drive shaft and the control rod are both passed through the two linear bearing groups and fixed inside the pressure shell.

[0013] Preferably, the two linear bearing groups are located on the same straight line.

[0014] The present invention also provides a nuclear reactor comprising a core, a reactor pressure vessel, and the above-mentioned nuclear reactor control system. The core is arranged inside the reactor pressure vessel, and the core is provided with a channel for inserting a control rod, and the channel and the control rod are located on the same straight line.

[0015] The connecting device of the present invention enables adjustment of the control rod's transverse spatial position and limits axial and radial displacement and circumferential rotation between the control rod and the drive mechanism, ensuring a tight connection between the drive mechanism and the control rod. This connecting device is particularly suitable for control rods that need to be arranged horizontally. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the connecting device in Example 1 of the present invention;

[0017] Figure 2 Schematic diagram of the structure of the main drive shaft in Example 1 of the present invention;

[0018] Figure 3 yes Figure 2 Left view of;

[0019] Figure 4 1 is a schematic structural diagram of a control rod in Example 1 of the present invention;

[0020] Figure 5 yes Figure 4 Left view of .

[0021] In the figure: 1-main drive shaft, 2-hook, 3-connecting rod, 4-tenon, 5-center channel, 6-control rod, 7-counterbore, 8-slot, 9-groove, 10-linear bearing group, 12-pressure shell. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of the present invention.

[0023] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “upper” and the like are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connect," "dispose," "install," "fix," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; they may refer to direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] The present invention provides a connecting device for connecting a control rod and a drive mechanism, comprising a connecting rod and a first locking assembly. A central channel is provided in the axial direction of a main drive shaft of the drive mechanism, and the connecting rod is disposed in the central channel. The first locking assembly comprises a hook provided at the end of the connecting rod and a countersunk hole provided at the end of the control rod. A slot is provided in the countersunk hole, and the shape of the slot matches that of the hook. The hook can extend into the countersunk hole and connect with the slot, thereby locking the axial displacement of the main drive shaft and the control rod.

[0027] The present invention also provides a nuclear reactor control system, comprising control rods and a drive mechanism, and also comprising the above-mentioned connecting device.

[0028] The present invention also provides a nuclear reactor comprising a core, a reactor pressure vessel, and the above-mentioned nuclear reactor control system. The core is arranged inside the reactor pressure vessel, and the core is provided with a channel for inserting a control rod, and the channel and the control rod are located on the same straight line.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment discloses a connection device for connecting a control rod 6 to a drive mechanism, comprising a connecting rod 3 and a first locking assembly. The drive mechanism's main drive shaft 1 is cylindrical, with a central bore 5 defined along its axial direction. The connecting rod 3 has a diameter smaller than that of the central bore 5. The connecting rod 3 is disposed within the central bore 5 and is movable axially along the central bore 5. The first locking assembly comprises a hook 2 disposed at the end of the connecting rod 3 and a counterbore 7 disposed at the end of the control rod 6. The counterbore 7 includes a slot 8, the shape of which matches the hook 2, allowing the hook 2 to extend into the counterbore 7 and connect with the slot 8. This locks the axial displacement of the main drive shaft 1 and the control rod 6, and allows the control rod 6 to move along with the main drive shaft 1 when the main drive shaft 1 moves away from the control rod 6.

[0031] like Figure 2 、 3 As shown in Figures 4 and 5, in this embodiment, the connecting device further includes a second locking assembly, which includes a tenon 4 and a groove 9. The tenon 4 is provided at the end of the main drive shaft 1, and the groove 9 is provided at the end of the control rod 6. The shape of the tenon 4 is adapted to the groove 9 so that the tenon 4 can extend into the groove 9, thereby locking the circumferential rotation (rotation of the control rod 6 around the center line of the main drive shaft 1) and radial displacement (displacement of the control rod 6 along any radial direction of the cross section of the main drive shaft 1) of the main drive shaft 1 and the control rod 6.

[0032] In this embodiment, the tenon 4 is protrudingly provided on the end face of the main drive shaft, and its cross-sectional shape is trapezoidal. Correspondingly, the cross-sectional shape of the groove is also trapezoidal.

[0033] In this embodiment, there are multiple tenons 4, evenly distributed along the circumference of the main drive shaft 1. The number of grooves 9 matches the number of tenons 4, and the grooves 9 are evenly distributed along the circumference of the end of the control rod 6, corresponding to the positions of the tenons 4. Specifically, the tenons 4 are located outside the central channel 5 and at the edge of the end surface of the main drive shaft, while the grooves 9 are located outside the counterbore 7 and at the edge of the end surface of the control rod.

[0034] The working process of the connection device in this embodiment is as follows:

[0035] The end face of the main drive shaft 1 contacts the end face of the control rod 6. The raised tenon 4 on the end face of the main drive shaft 1 engages with the groove 9 on the end face of the control rod 6. The tenon 4 is inserted into the groove 9 to limit the radial displacement and circumferential rotation of the control rod 6 relative to the main drive shaft 1, thereby achieving radial and circumferential locking.

[0036] After radial and circumferential locking is completed, the connecting rod 3 in the central channel 5 is moved so that the hook 2 at the end of the connecting rod 3 enters the counterbore 7 at the end of the control rod 6 and connects with the groove 8. The connecting rod 3 is then rotated so that the groove 8 of the control rod 6 is tightly hooked with the hook 2 of the connecting rod 3, thereby limiting the axial displacement of the control rod 6 relative to the main drive shaft 1 and completing the axial locking.

[0037] After radial, circumferential and axial locking are completed, the main drive shaft 1 pushes the control rod 6 with its end face or pulls the control rod 6 with its claw 2;

[0038] When it is necessary to unlock the connection between the control rod 6 and the main drive shaft 1, it is only necessary to rotate the connecting rod 3 in the opposite direction so that the hook 2 of the connecting rod 3 is disengaged from the slot 8 of the control rod 6, and then pull out the connecting rod 3 and the main drive shaft 1.

[0039] The connection device in this embodiment includes a first locking assembly and a second locking assembly, which can effectively limit the axial displacement, circumferential rotation and radial displacement of the control rod 6 and the drive mechanism, making the connection between the drive mechanism and the control rod 6 tighter and more stable. In addition, the connection device can be arranged in the horizontal direction of the horizontal reactor core, and can realize the adjustment of the lateral spatial position (and non-vertical position) of the control rod 6 in the core.

[0040] Example 2

[0041] This embodiment discloses a nuclear reactor control system, including a control rod 6 and a drive mechanism, and also includes the connecting device in embodiment 1.

[0042] In this embodiment, the nuclear reactor control system further includes a pressure vessel 12 , the drive mechanism includes a main drive shaft 1 , and the control rods 6 , the main drive shaft 1 and the connecting device are all arranged inside the pressure vessel 12 .

[0043] In this embodiment, the nuclear reactor control system also includes a linear bearing group 10, and two linear bearing groups 10 are provided. The two linear bearing groups 10 are arranged inside the pressure shell 12 and are respectively arranged on the outer periphery of the main drive shaft 1 and the control rod 6. The main drive shaft 1 and the control rod 6 are both fixed in the pressure shell 12 through the two linear bearing groups 10. Specifically, the linear bearing groups 10 are located on the same straight line, thereby ensuring that the main drive shaft 1 and the control rod 6 are located on the same straight line.

[0044] The connection mode between the driving mechanism of the nuclear reactor control system and the control rod 6 in this embodiment is stable, and the control rod 6 can be stably driven in the axial direction, thereby effectively controlling the activity of the reactor core.

[0045] Example 3

[0046] This embodiment discloses a nuclear reactor, including a core, a reactor pressure vessel, and the nuclear reactor control system of Example 2. The core is arranged inside the reactor pressure vessel, and the core is provided with a channel for inserting a control rod 6, and the channel and the control rod 6 are located on the same straight line.

[0047] In this embodiment, the reactor pressure vessel and the pressure shell 12 are interconnected and together constitute the reaction boundary of the nuclear reactor. The diameter of the channel on the core is adapted to the diameter of the control rod 6. The control rod 6 is inserted into or pulled out of the channel along a straight line under the drive of the main drive shaft 1, thereby controlling the reaction of the core.

[0048] The driving mode of the control rod 6 of the nuclear reactor in this embodiment is stable and has high safety.

[0049] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A connecting device for connecting a control rod (6) to a drive mechanism, characterized in that: It comprises a connecting rod (3), a first locking assembly, A central hole (5) is provided in the main driving shaft (1) of the driving mechanism along its axial direction, and the connecting rod (3) is arranged in the central hole (5). The first locking assembly comprises a hook (2) arranged at the end of the connecting rod (3), and a countersunk hole (7) arranged at the end of the control rod (6); a slot (8) is provided in the countersunk hole (7); the shape of the slot (8) is adapted to the hook (2); the hook (2) can extend into the countersunk hole (7) and connect with the slot (8), thereby locking the axial displacement of the main drive shaft (1) and the control rod (6); The device also includes a second locking assembly, The second locking assembly comprises a tenon (4) and a groove (9), wherein the tenon (4) is arranged at the end of the main drive shaft (1), and the groove (9) is arranged at the end of the control rod (6), the shape of the tenon (4) is adapted to the groove (9), and the tenon (4) extends into the groove (9), thereby locking the circumferential rotation and radial displacement of the main drive shaft (1) and the control rod (6); The connecting device is used to adjust the position of the control rod in the lateral space.

2. The connection device according to claim 1, characterized in that: There are a plurality of tenon points (4), and the plurality of tenon points (4) are evenly distributed along the circumference of the main drive shaft (1). The number of the grooves (9) is consistent with the number of the tenons (4); the plurality of grooves (9) are evenly distributed along the circumference of the end of the control rod (6) and correspond to the positions of the tenons (4).

3. The connection device according to claim 2, characterized in that: The tenon point (4) is arranged on the outside of the central channel (5), and the groove (9) is arranged on the outside of the countersunk hole (7).

4. A nuclear reactor control system, comprising a control rod (6) and a drive mechanism, characterized in that: It also comprises the connecting device according to any one of claims 1 to 3.

5. The nuclear reactor control system according to claim 4, characterized in that: Also includes a pressure shell (12), The drive mechanism comprises a main drive shaft (1), and the control rod (6), the main drive shaft (1) and the connecting device are all arranged inside the pressure shell (12).

6. The nuclear reactor control system according to claim 5, characterized in that: Also includes a linear bearing assembly (10), Two linear bearing groups (10) are provided, and the two linear bearing groups (10) are arranged inside the pressure shell (12); the main drive shaft (1) and the control rod (6) both pass through the two linear bearing groups (10) and are fixed inside the pressure shell (12).

7. The nuclear reactor control system according to claim 6, characterized in that: The two linear bearing groups (10) are located on the same straight line.

8. A nuclear reactor, comprising a core and a reactor pressure vessel, characterized in that: Also includes the nuclear reactor control system according to any one of claims 4 to 7, The core is arranged inside the reactor pressure vessel, and the core is provided with a channel for inserting a control rod (6), wherein the channel and the control rod (6) are located on the same straight line.

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