Reactor control rod assembly tilt lock and control rod assembly thereof

Abstract

The application discloses a reactor control rod assembly tipping locking device and a control rod assembly thereof. The tipping locking device is arranged in a pressure shell assembly of the control rod assembly, and a slidable driving rod assembly is arranged in the center of the tipping locking device. The tipping locking device comprises an electromagnetic coil assembly, a fixed armature, an elastic piece, a sliding armature and a protection claw arranged in sequence from top to bottom. The electromagnetic coil assembly is sleeved outside the fixed armature and the sliding armature. The top of the elastic piece is in abutment with the fixed armature, the bottom of the elastic piece is in abutment with the sliding armature, and the protection claw is pivotally arranged on the sliding armature. The tipping locking device can lock the driving rod assembly in a passive state, thereby preventing the control rod from being pulled out of the reactor core. The passive locking can be remotely controlled, and the locking structure is recoverable.

Description

Technical Field

[0001] This invention relates to the field of nuclear reactor control rod drive mechanism technology, and in particular to a reactor control rod assembly tilting and locking device and its control rod assembly. Background Technology

[0002] In reactor control rod technology, to address the potential for large-angle tilting, swaying, and overturning of reactor control rod assemblies under certain conditions or environments, and to ensure that the control rods remain locked in the core under extreme overturning conditions, thus controlling core reactivity, a locking mechanism is required in the reactor control rod drive mechanism to prevent overturning. The typical operating mode of this locking mechanism is as follows: during normal operation of the control rod drive mechanism, the locking mechanism is not energized and does not clamp or lock the drive rod assembly. However, in the event of the aforementioned extreme overturning conditions, the locking mechanism is energized, clamping the drive rod assembly and locking it in place.

[0003] However, in the existing drive locking mechanism, the tilting locking device can only clamp and lock when it is in an active state. Furthermore, it remains locked even after power is cut off, lacking recoverability and unable to be remotely unlocked. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a reactor control rod assembly tilting and locking device and the control rod assembly thereof.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: A reactor control rod assembly tilting and locking device is constructed. The tilting and locking device is disposed in the pressure-resistant shell assembly of the control rod assembly, and a slidable drive rod assembly is disposed at the center of the tilting and locking device. The tilting and locking device includes an electromagnetic coil assembly, a fixed armature, an elastic element, a sliding armature, and a protective claw arranged sequentially from top to bottom. The electromagnetic coil assembly is sleeved outside the fixed armature and the sliding armature. The top of the elastic element abuts against the fixed armature, and the bottom of the elastic element abuts against the sliding armature. The protective claw is pivotally disposed on the sliding armature. When the electromagnetic coil assembly is energized, the sliding armature drives the protective claw to slide towards the fixed armature, thereby releasing the protective claw from the constraint of the drive rod assembly. When the electromagnetic coil assembly is de-energized, the elastic element drives the sliding armature to slide the protective claw away from the fixed armature, thereby establishing the constraint of the protective claw on the drive rod assembly.

[0006] Preferably, the elastic element has a constant tendency to drive the sliding armature to move away from the fixed armature, the protective claw is pivotally mounted on the sliding armature and pivots with the movement of the sliding armature, and the sliding armature drives the protective claw to pivot and engage or disengage with the drive rod assembly during axial sliding.

[0007] Preferably, the protective claw is pivotally connected to the sliding armature via a connecting rod, one end of the connecting rod is rotatably connected to the sliding armature via a first pin, and the other end of the connecting rod is rotatably connected to the protective claw via a second pin.

[0008] Preferably, the tilting locking device further includes a buffer mechanism, which is disposed inside the fixed armature and communicates with the outside of the fixed armature. A cavity is provided between the tilting locking device and the pressure-resistant shell assembly, and a buffer medium is provided in the cavity. The buffer medium flows between the cavity and the buffer mechanism as the sliding armature slides.

[0009] Preferably, the buffer mechanism includes a buffer channel and a one-way valve assembly. The one-way valve assembly is disposed in the buffer channel. One end of the buffer channel is connected to the outside of the side of the fixed armature near the sliding armature, and the other end of the buffer channel is connected to the outside of the side of the fixed armature near the drive rod assembly.

[0010] Preferably, the buffer channel includes a first channel, a buffer cavity, and a second channel; one end of the first channel communicates with the outside of the fixed armature near the sliding armature, and the other end of the first channel is connected to the buffer cavity; one end of the second channel communicates with the outside of the fixed armature near the drive rod assembly, and the other end of the second channel communicates with the buffer cavity; the diameter of the buffer cavity is larger than the diameters of the first channel and the second channel; and the one-way valve assembly is provided inside the buffer cavity.

[0011] Preferably, the one-way valve assembly includes a stop and a semi-recessed structure; the semi-recessed structure is disposed at the connection between the buffer chamber and the first channel, and the stop is disposed in the semi-recessed structure.

[0012] Preferably, the stop is made of metal; the buffer medium is water.

[0013] Preferably, the elastic element is a spring.

[0014] Preferably, the tilting locking device further includes an outer locking nut and a support ring, the outer locking nut being disposed on top of the fixed armature; the support ring being disposed below the protective claw.

[0015] A reactor control rod assembly, employing the reactor control rod assembly tilting locking device described in any one of the above.

[0016] The implementation of this invention has the following beneficial effects: the tilting locking device of this invention can lock the drive rod assembly in a passive state, thereby preventing the control rod from being pulled out of the core, and can achieve passive locking through remote control. After locking, it can be unlocked remotely, and the locking structure is recoverable. Attached Figure Description

[0017] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention in the energized state;

[0019] Figure 2 This is an enlarged view of the structure of the present invention in the power-off state;

[0020] Figure 3 This is a schematic diagram of the elastic element structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the protective claw of the present invention in the open state;

[0022] Figure 5 This is a schematic diagram showing the flow direction of the buffer medium inside the buffer mechanism when the protective claw of the present invention swings open;

[0023] Figure 6 This is a schematic diagram of the protective claw of the present invention in the swing-in state;

[0024] Figure 7 This is a schematic diagram showing the flow direction of the buffer medium within the buffer mechanism when the protective claw of the present invention is inserted.

[0025] Explanation of reference numerals in the attached drawings: 1-Schematic diagram of the pressure-resistant shell assembly; 2-Drive rod assembly; 3-Tilting locking device; 31-Electromagnetic coil assembly; 32-Fixed armature; 33-Elastic element; 34-Sliding armature; 35-Protective claw; 36-Connecting rod; 37-First pin; 38-Second pin; 39-Rotating shaft; 21-Boss structure; 4-Buffer mechanism; 5-Cavity; 41-Buffer channel; 42-One-way valve assembly; 411-First channel; 412-Buffer chamber; 413-Second channel; 421-Stop block; 422-Semi-recessed structure; 6-External locking nut; 7-Support ring. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "lower," "top," "bottom," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing the technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on the present invention.

[0027] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," etc., are used only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0028] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0029] Example 1:

[0030] Please see Figure 1-3This invention discloses a reactor control rod assembly tilting and locking device 3. The tilting and locking device 3 is disposed in the pressure shell assembly of the control rod assembly (the part of the pressure shell assembly is indicated by the number 1 in the figure). A slidable drive rod assembly 2 passes through the center of the tilting and locking device 3. The tilting and locking device 3 includes an electromagnetic coil assembly 31, a fixed armature 32, an elastic element 33, a sliding armature 34, and a protective claw 35 arranged sequentially from top to bottom. The electromagnetic coil assembly 31 is sleeved on the outside of the fixed armature 32 and the sliding armature 34, and the top of the elastic element 33... The part abuts against the fixed armature 32, the bottom of the elastic member 33 abuts against the sliding armature 34, and the protective claw 35 is pivotally mounted on the sliding armature 34; when the electromagnetic coil assembly 31 is energized, the sliding armature 34 drives the protective claw 35 to slide towards the fixed armature 32, so as to release the constraint of the protective claw 35 on the drive rod assembly 2; when the electromagnetic coil assembly 31 is de-energized, the elastic member 33 drives the sliding armature 34 to slide the protective claw 35 away from the fixed armature 32, so as to establish the constraint of the protective claw 35 on the drive rod assembly 2.

[0031] In this embodiment, the elastic element 33 has a constant tendency to drive the sliding armature 34 to move away from the fixed armature 32. The protective claw 35 is pivotally mounted on the sliding armature 34 and makes a pivoting motion with the movement of the sliding armature 34. During the axial sliding process, the sliding armature 34 drives the protective claw 35 to make a pivoting motion that engages or disengages with the drive rod assembly 2.

[0032] In this embodiment, the control rod assembly has excellent neutron absorption capability. When the control rod is fully inserted into the reaction center, the reactor stops; when the control rod is raised, the reactor starts; in the event of a sudden accident, the control rod falls rapidly, enabling rapid reactor shutdown. The pressure shell assembly seals and supports the reactor and provides space for the movement of the drive rod assembly 2. The drive rod assembly 2 is used to precisely control the movement of its control rods, enabling precise adjustment of the reactor reaction rate. The electromagnetic coil assembly 31 is used to energize and de-energize the fixed armature 32 and the sliding armature 34, thereby achieving the connection between the fixed armature 32 and the sliding armature. The opposite ends of the iron 34 form magnetic poles that attract each other (i.e., the magnetic poles of the opposite ends of the fixed armature 32 and the sliding armature 34 are opposite), which in turn drives the sliding armature 34 to slide; the fixed armature 32 is used to drive the sliding armature 34 to slide closer to the fixed armature 32 after magnetization; the elastic element 33 is used to drive the sliding armature 34 to slide away from the fixed armature 32 through elastic force, so that the two are far apart; the sliding armature 34 is used to drive the protective claw 35 to perform pivoting motion through its own sliding; the protective claw 35 is used to engage or disengage with the drive rod assembly 2 through pivoting motion, thereby locking or unlocking the drive rod assembly 2.

[0033] In this embodiment, during normal reactor operation, the tilting locking device 3 magnetizes the fixed armature 32 and the sliding armature 34 by energizing the electromagnetic coil assembly 31. At this time, the sliding armature 34 slides towards the fixed armature 32 under magnetic force, and the elastic element 33 between them is compressed. Simultaneously, the sliding armature 34 drives the protective claw 35 to swing away from the drive rod assembly 2, preventing the protective claw 35 from engaging with the drive rod assembly 2 and creating a clamping effect. Meanwhile, the drive rod assembly 2 continues its normal lifting and lowering motion. When the reactor is in an abnormal operating condition, the tilting locking device 3 de-energizes the electromagnetic coil assembly 31, thereby releasing the magnetization of the fixed armature 32 and the sliding armature 34. The sliding armature 34 slides away from the fixed armature 32 due to the elastic force of the elastic element 33. Simultaneously, the sliding armature 34 drives the protective claw 35 to swing towards the drive rod assembly 2, engaging the protective claw 35 with the drive rod assembly 2 to achieve a clamping effect and lock the drive rod assembly 2. When the reactor returns to normal operation, after energizing again, the fixed armature 32 regains its magnetic force, driving the sliding armature 34 upward, thereby disengaging the protective claw 35 from the drive rod assembly 2, thus enabling remote unlocking and providing reversibility. The remote unlocking is achieved by energizing the electromagnetic coil assembly 31, magnetizing the fixed armature 32 and the sliding armature 34, causing the sliding armature 34 to slide towards the fixed armature 32, thereby disengaging the protective claw 35 from the drive rod assembly 2, and achieving remote unlocking.

[0034] In one specific example of this embodiment, as shown in the appendix Figure 1-2 As shown, the protective claw 35 is pivotally connected to the sliding armature 34 via a connecting rod 36. One end of the connecting rod 36 is rotatably connected to the sliding armature 34 via a first pin 37, and the other end of the connecting rod 36 is rotatably connected to the protective claw 35 via a second pin 38.

[0035] Furthermore, the first pin 37 or the second pin 38 can be a long pin or a short pin.

[0036] In this example, the center of the protective claw 35 is rotatably mounted on the pressure-resistant housing assembly via a pivot 39.

[0037] In this embodiment, as shown in the appendix Figure 2 Position A in the middle, i.e., attached Figure 3 As shown, the elastic element 33 can be a spring.

[0038] Furthermore, the workflow in this embodiment is as follows:

[0039] When the reactor is under normal operating conditions, the tilt locking device 3 is in the following state: Figure 1As shown, when the electromagnetic coil assembly 31 is energized, the fixed armature 32 and the sliding armature 34 are magnetized. Under the action of magnetic force, the sliding armature 34 slides toward the fixed armature 32. At the same time, the protective claw 35 is swung out by pulling the connecting rod 36 and does not engage with the drive rod assembly 2. At this time, the tilting locking device 3 does not clamp or limit the drive rod assembly 2, and the drive rod assembly 2 can perform normal lifting and lowering movements.

[0040] When the reactor is under extreme tilting conditions, the tilting locking device 3 is in the following state: Figure 2 As shown. When the electromagnetic coil assembly 31 is de-energized, the sliding armature 34 slides away from the fixed armature 32 under the force of the spring. Simultaneously, the sliding armature 34 pushes the connecting rod 36 to swing the protective claw 35 into place, engaging with the drive rod assembly 2. At this time, the tilting locking device 3 clamps and limits the drive rod assembly 2, preventing it from moving away from the reactor core, and passively locks the drive rod. Furthermore, when the reactor returns to normal operating conditions, the tilting locking device 3 can be remotely unlocked, demonstrating recoverability.

[0041] In this embodiment, as shown in the appendix Figure 2 As shown, the engagement can be achieved by providing a boss structure 21 on the drive rod assembly 2, and the protective claw 35 abutting against the boss structure 21 on the drive rod assembly 2 when it swings out, thereby locking the drive rod assembly 2. Alternatively, a groove structure can be provided on the drive rod assembly 2, and the protective claw 35 can extend into the groove structure on the drive rod assembly 2 when it swings out, thereby locking the drive rod assembly 2. It should be noted that in this embodiment, the shape of the protective claw 35 is not specifically limited, nor is the structure in the drive rod assembly 2 that engages with the protective claw 35 specifically limited. In actual operation, it is only necessary to design the corresponding engagement shape according to the requirements.

[0042] Example 2:

[0043] This embodiment is based on the tilting locking device 3 in Embodiment 1, and is further improved as shown in the attached figure. Figure 4 and attached Figure 6 As shown, the tilt locking device 3 also includes a buffer mechanism 4, which is located inside the fixed armature 32 and communicates with the outside of the fixed armature 32. A cavity 5 is provided between the tilt locking device 3 and the pressure-resistant shell assembly. A buffer medium is provided in the cavity 5, and the buffer medium flows between the cavity 5 and the buffer mechanism 4 as the sliding armature 34 slides. Through the cooperation between the buffer medium, the buffer mechanism 4, and the cavity 5, the sliding speed of the sliding armature 34 can be reduced under the pressure of the buffer medium, thereby reducing the swing-in action of the protective claw 35 (i.e., engaging with the drive rod assembly 2 to achieve clamping). This prevents the protective claw 35 from affecting the rapid drop of the control rod due to excessively rapid swing-in action, thus affecting the safe shutdown of the reactor.

[0044] In this embodiment, as shown in the appendix Figure 4 and attached Figure 6 As shown, the buffer mechanism 4 includes a buffer channel 41 and a one-way valve assembly 42. The one-way valve assembly 42 is disposed in the buffer channel 41. One end of the buffer channel 41 is connected to the outside of the side of the fixed armature 32 near the sliding armature 34, and the other end of the buffer channel 41 is connected to the outside of the side of the fixed armature 32 near the drive rod assembly 2.

[0045] The one-way valve assembly 42 ensures the following process: when the protective claw 35 engages with the drive rod assembly 2, i.e., when the sliding armature 34 slides away from the fixed armature 32, the buffer medium in the cavity 5 can enter the buffer channel 41 from the opening near the drive rod assembly 2 under pressure, and then slowly flow out from the other side of the buffer channel 41, i.e., the opening near the sliding armature 34, through the one-way conduction of the one-way valve, and re-enter the cavity 5. Through the one-way conduction of the one-way valve assembly 42 in the above process, the buffer medium is ensured to flow unidirectionally within the buffer channel 41 along with the movement direction of the sliding armature 34. The buffer channel 41 forms the flow path of the buffer medium, allowing the buffer medium to achieve a buffering effect on the sliding armature 34 through pressure during its flow.

[0046] Example 3:

[0047] This embodiment is based on Embodiment 2, and further improves the specific structure of the buffer channel 41, as shown in the attached figure. Figure 4-7 As shown, the buffer channel 41 includes a first channel 411, a buffer cavity 412, and a second channel 413. One end of the first channel 411 is connected to the outside of the fixed armature 32 near the sliding armature 34, and the other end of the first channel 411 is connected to the buffer cavity 412. One end of the second channel 413 is connected to the outside of the fixed armature 32 near the drive rod assembly 2, and the other end of the second channel 413 is connected to the buffer cavity 412. The diameter of the buffer cavity 412 is larger than the diameter of the first channel 411 and the second channel 413. A one-way valve assembly 42 is provided inside the buffer cavity 412.

[0048] Furthermore, the specific structure of the one-way valve assembly 42 in Embodiment 2 is improved, as shown in the attached figure. Figure 5 and attached Figure 7 As shown, the one-way valve assembly 42 includes a stop block 421 and a semi-recessed structure 422; the semi-recessed structure 422 is disposed at the connection between the buffer chamber 412 and the first channel 411, and the stop block 421 is disposed in the semi-recessed structure 422.

[0049] In this embodiment, the stop 421 and the semi-socket structure 422 cooperate to achieve the one-way conduction function of a one-way valve, enabling the protective claw 35 to quickly swing out and disengage when the coil is energized. That is, in the case of reactor rollover, when the coil is de-energized, the protective claw 35, under the pressure buffering effect of the buffer medium, slowly swings in to achieve clamping (time T1), ensuring that in the case of reactor rollover, the rapid swinging in of the protective claw 35 will not affect the rapid dropping of the control rods (the rapid dropping time is set to T2, i.e., T1 should be greater than T2), thereby affecting the safe shutdown of the reactor. In this embodiment, the stop 421 can be a sphere, and the semi-socket structure 422 is correspondingly set as a hemispherical socket structure.

[0050] Example 4:

[0051] This embodiment provides a reactor control rod assembly, which applies the reactor control rod assembly tilting and locking device described in any one of embodiments one to three above. The structure of the reactor control rod assembly can use existing technology and will not be elaborated here.

[0052] The working process of buffer mechanism 4 is as follows:

[0053] There is a cavity 5 between the pressure-resistant shell assembly of the control rod drive mechanism and the tilting locking device 3. Under actual operating conditions, the cavity 5 is filled with a buffer medium.

[0054] During the swinging process of the protective claw 35 of the tilting locking device 3: as shown in the attached... Figure 4-5 As shown, when the electromagnetic coil assembly 31 is energized, the fixed armature 32 and the sliding armature 34 are magnetized. Under the action of the magnetic force, the sliding armature 34 slides toward the fixed armature 32. At this time, part of the buffer medium in the cavity 5 between the fixed armature 32 and the sliding armature 34 flows into the gap between the pressure-resistant shell assembly and the tilting locking device 3. Most of it flows into the first channel 411 of the fixed armature 32 shown in the figure, and under the pressure of the buffer medium, it breaks through the stop block 421 and enters the buffer cavity 412. Finally, it flows into the gap between the drive rod assembly 2 and the tilting locking device 3 through the second channel 413 above the buffer cavity 412 until the fixed armature 32 and the sliding armature 34 move to the attraction state and the protective claw 35 swings out.

[0055] The protective claw 35 of the tilting locking device 3 provides cushioning during the swing-in process: as shown in the attached diagram. Figure 2As shown, under reactor tilting conditions, the electromagnetic coil assembly 31 is de-energized, and the sliding armature 34 slides away from the fixed armature 32 under the force of the spring. The buffer medium in the buffer cavity 412 inside the fixed armature 32 needs to flow into the gap between the fixed armature 32 and the sliding armature 34 through the opening connecting the first channel 411 in the fixed armature 32 to the outside. At the same time, the buffer medium in the cavity 5 between the pressure shell assembly and the tilting locking device 3 also flows into the buffer cavity 412 through the second channel 413. However, due to the small gap caused by the cooperation between the stop block 421 and the semi-recessed structure 422, the buffer medium cannot quickly pass through the first channel 411. At this time, under the pressure of the buffer medium, the spring force slowly pushes the sliding armature 34 to slide away from the fixed armature 32 to a lower position, until the protective claw 35 slowly swings in under the pushing action of the connecting rod 36.

[0056] Preferably, in this embodiment, the stop 421 is made of metal, preferably steel.

[0057] Preferably, in this embodiment, the buffer medium is water.

[0058] In addition, in this embodiment, the one-way valve assembly 42 can also be a one-way valve, and the flow rate of the buffer medium can be controlled by controlling the valve opening of the one-way valve, thereby achieving the buffering effect.

[0059] In this embodiment, the tilting locking device 3 further includes an outer locking nut 6 and a support ring 7. The outer locking nut 6 is disposed on top of the fixed armature 32; the support ring 7 is disposed below the protective claw 35. Both the outer locking nut 6 and the support ring 7 are used for the installation and fixation of the tilting locking device.

[0060] It should be noted that this embodiment does not impose specific restrictions on the shape of the first channel 411, the second channel 413, and the buffer cavity 412. That is, the cross-sections of the first channel 411, the second channel 413, and the buffer cavity 412 can be circular, elliptical, or square. It is only necessary to ensure that the diameter of the buffer cavity 412 is greater than the diameter of the first channel 411 and the second channel 413 to ensure the slow flow of the buffer medium.

[0061] It should also be noted that the tilting locking device 3 of the present invention adopts a modular design. When the stack is stopped and the material is changed, the tilting locking device 3 can be completely removed from the pressure shell assembly and installed without affecting the functions of opening the cover, locking the cover, and disengaging and interlocking the drive rod assembly 2 and the control rod assembly during the material change.

[0062] The beneficial effects of this embodiment:

[0063] By energizing and de-energizing the electromagnetic coil assembly 31, the protective claw 35 swings out and in, thereby clamping the drive rod assembly 2. This ensures that the drive rod assembly 2 is reliably locked in the reactor core under extreme tilting conditions, achieving a safe reactor shutdown. The drive rod can be passively locked, and when the reactor returns to normal operation, the tilting locking device 3 can be remotely unlocked, providing recoverability. Furthermore, the buffer mechanism 4 in the tilting locking device 3 allows the protective claw 35 to swing out rapidly when the coil is energized, and to swing in slowly under the pressure of the buffer medium when the coil is de-energized during reactor tilting. This ensures that the rapid swinging in of the protective claw 35 during reactor tilting will not affect the rapid drop of the control rods, thus ensuring a safe reactor shutdown. The mechanism of this invention is small in size (diameter less than 68 mm, height less than 136 mm) and compact in structure, adaptable to the requirements of high-temperature and high-irradiation environments at the reactor top.

[0064] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A reactor control rod assembly tilting and locking device, wherein the tilting and locking device is disposed in the pressure-resistant shell assembly of the control rod assembly, and a slidable drive rod assembly is disposed at the center of the tilting and locking device; characterized in that, The tilting locking device adopts a modular design, allowing it to be completely removed and installed from the pressure-resistant shell assembly. The tilting locking device includes an electromagnetic coil assembly, a fixed armature, an elastic element, a sliding armature, and a protective claw arranged sequentially from top to bottom. The electromagnetic coil assembly is sleeved outside the fixed armature and the sliding armature. The top of the elastic element abuts against the fixed armature, and the bottom of the elastic element abuts against the sliding armature. The protective claw is pivotally mounted on the sliding armature. The protective claw is pivotally connected to the sliding armature via a connecting rod. One end of the connecting rod is rotatably connected to the sliding armature via a first pin, and the other end of the connecting rod is rotatably connected to the protective claw via a second pin. The axial sliding motion of the sliding armature is converted into the pivoting motion of the protective claw via the connecting rod, and the pivoting motion of the protective claw is used to engage and lock or disengage from the drive rod assembly for unlocking. When the electromagnetic coil assembly is energized, the sliding armature drives the protective claw to slide towards the fixed armature, thereby releasing the protective claw from its constraint on the drive rod assembly. When the electromagnetic coil assembly is de-energized, the elastic element drives the sliding armature to slide the protective claw away from the fixed armature, thereby establishing the constraint of the protective claw on the drive rod assembly.

2. The reactor control rod assembly tilting and locking device according to claim 1, characterized in that, The elastic element has a constant tendency to drive the sliding armature to move away from the fixed armature. The protective claw is pivotally mounted on the sliding armature and pivots with the movement of the sliding armature. During the axial sliding process, the sliding armature drives the protective claw to pivot and engage or disengage with the drive rod assembly.

3. The reactor control rod assembly tilting and locking device according to claim 1, characterized in that, The tilting locking device further includes a buffer mechanism, which is disposed inside the fixed armature and communicates with the outside of the fixed armature. A cavity is provided between the tilting locking device and the pressure-resistant shell assembly, and a buffer medium is provided in the cavity. The buffer medium flows between the cavity and the buffer mechanism as the sliding armature slides.

4. A reactor control rod assembly tilting and locking device according to claim 3, characterized in that, The buffer mechanism includes a buffer channel and a one-way valve assembly. The one-way valve assembly is disposed in the buffer channel. One end of the buffer channel is connected to the outside of the side of the fixed armature near the sliding armature, and the other end of the buffer channel is connected to the outside of the side of the fixed armature near the drive rod assembly.

5. A reactor control rod assembly tilting and locking device according to claim 4, characterized in that, The buffer channel includes a first channel, a buffer cavity, and a second channel; one end of the first channel is connected to the outside of the fixed armature near the sliding armature, and the other end of the first channel is connected to the buffer cavity; one end of the second channel is connected to the outside of the fixed armature near the drive rod assembly, and the other end of the second channel is connected to the buffer cavity; the diameter of the buffer cavity is larger than the diameters of the first channel and the second channel; and the one-way valve assembly is provided inside the buffer cavity.

6. A reactor control rod assembly tilting and locking device according to claim 5, characterized in that, The one-way valve assembly includes a stop and a semi-recessed structure; the semi-recessed structure is disposed at the connection between the buffer chamber and the first channel, and the stop is disposed in the semi-recessed structure.

7. A reactor control rod assembly tilting and locking device according to claim 6, characterized in that, The stop block is made of metal; the buffer medium is water.

8. A reactor control rod assembly tilting and locking device according to claim 1, characterized in that, The elastic element is a spring.

9. A reactor control rod assembly tilting and locking device according to claim 1, characterized in that, The tilting locking device also includes an outer locking nut and a support ring. The outer locking nut is located on top of the fixed armature, and the support ring is located below the protective claw.

10. A reactor control rod assembly, characterized in that, The reactor control rod assembly tilting and locking device described in any one of claims 1-9 above.

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