阅读说明：本技术 一种防反应堆控制棒弹棒装置及反应堆 (Anti-reactor control rod ejection prevention device and reactor ) 是由 梁活 崔旭阳 罗汉炎 陈韵茵 杨江 刘金林 王仙茅 纪文英 刘仲昊 路长冬 陈忆 于 2020-12-11 设计创作，主要内容包括：本发明涉及反应堆系统设备技术领域,提供一种防反应堆控制棒弹棒装置及反应堆。装置上部驱动杆,其内部包括一容置腔；下部驱动杆；触发组件,包括触发机构和触发针,触发机构用于保持触发针处于锁定状态,当上部驱动杆以较大的加速度向上移动时,触发机构动作引发触发针位移；支撑件,设置在上部驱动杆与下部驱动杆的结合处,与触发针联动；本发明用于在驱动杆失控弹出事故工况下,实现驱动杆与控制棒组件自动断开连接,避免了控制棒的失控弹出,从而保证堆芯不会在短时间内引入大量正反应性,降低了包壳破损的几率,提高了反应堆安全性。(The invention relates to the technical field of reactor system equipment, and provides a reactor control rod ejection prevention device and a reactor. The upper driving rod of the device comprises an accommodating cavity inside; a lower drive rod; the trigger assembly comprises a trigger mechanism and a trigger needle, the trigger mechanism is used for keeping the trigger needle in a locked state, and when the upper driving rod moves upwards at a large acceleration, the trigger mechanism acts to trigger the displacement of the trigger needle; the supporting piece is arranged at the joint of the upper driving rod and the lower driving rod and is linked with the trigger needle; the invention is used for realizing the automatic disconnection of the driving rod and the control rod assembly under the working condition of the out-of-control ejection accident of the driving rod, and avoiding the out-of-control ejection of the control rod, thereby ensuring that the reactor core can not introduce a large amount of positive and negative responses in a short time, reducing the probability of cladding damage and improving the safety of the reactor.)

1. An anti-reactor control rod ejection prevention device, comprising:

the upper driving rod comprises an accommodating cavity inside;

the lower driving rod is detachably connected to the bottom of the upper driving rod;

the trigger assembly is arranged in the accommodating cavity and comprises a trigger mechanism and a trigger needle, the trigger mechanism is used for keeping the trigger needle in a locked state, and when the upper driving rod moves upwards at a higher acceleration, the trigger mechanism acts to trigger the trigger needle to move;

the supporting piece is arranged at the joint of the upper driving rod and the lower driving rod and is linked with the trigger needle;

when the trigger pin is in a locked state, the support part supports the lower driving rod and is fixedly arranged at the lower part of the upper driving rod; when the trigger pin is displaced, the supporting piece is retracted, and the lower driving rod is separated from the upper driving rod and falls off under the action of gravity.

2. The anti-reverse reactor control rod springing device as claimed in claim 1, wherein the accommodating cavity is arranged at the upper side and the lower side inside the upper driving rod and comprises an upper chamber and a lower chamber, and a communication hole is arranged between the upper chamber and the lower chamber.

3. The anti-reverse reactor control rod ejection device as recited in claim 2, wherein a square boss is fixed at the bottom of the upper driving rod, and a square groove matched with the boss is formed at the top of the lower driving rod.

4. The anti-reverse reactor control rod ejection device as recited in claim 1, wherein the triggering mechanism is arranged in the accommodating cavity and comprises a first spring, a triggering piece and a locking mechanism from top to bottom in sequence; the upper end of the first spring is fixed at the top of the accommodating cavity, and the lower end of the first spring is fixedly connected with the trigger piece;

the locking mechanism is arranged between the trigger needle and the trigger piece, and in a locking state, the locking mechanism keeps the trigger needle in a locking state; in the triggering state, the triggering piece triggers the locking mechanism to unlock, and the triggering needle is released.

5. The anti-reactor control rod ejection device of claim 4, wherein the locking mechanism comprises a T-shaped piece, a spring piece, a twist trigger rod and an L-shaped trigger rod;

a pair of supports which are horizontally distributed at intervals are fixed in the accommodating cavity, a sliding hole is formed in the center of each support, the lower section of the T-shaped part is slidably arranged in the sliding hole in a penetrating manner, the bottom of the T-shaped part is in contact with the free end of the spring piece, and the other end of the spring piece is fixed on the inner wall of the accommodating cavity;

the twisting trigger rod is close to the lower side of the spring piece, and one end of the twisting trigger rod is rotatably connected to the inner wall of the accommodating cavity through a torsion spring;

the upper end of the L-shaped trigger rod is abutted against the free end of the twisting trigger rod, the bottom of the L-shaped trigger rod is rotatably hinged in the accommodating cavity, and the free end of the lower part of the L-shaped trigger rod locks the trigger needle;

when the spring piece is pressed and deformed downwards, the twisting trigger rod can be squeezed to rotate downwards, so that the limitation on the upper end of the L-shaped trigger rod is relieved, and the L-shaped trigger rod can rotate to unlock the trigger needle.

6. The anti-reverse reactor control rod ejection device as recited in claim 5, wherein the twisting trigger bar is naturally distributed with the main body in a horizontal direction parallel to the spring plate, the L-shaped trigger bar comprises two sections of long and short bars perpendicular to each other, and when the twisting trigger bar is horizontal, the free end of the twisting trigger bar supports the long bar to be in a vertical state, so as to restrain the twisting of the L-shaped trigger bar.

7. The anti-reverse reactor control rod ejection device as recited in claim 5, wherein the spring constant of the first spring, the weight of the trigger, and the distance between the trigger and the T-shaped part during normal suspension match the acceleration of the upper driving rod in the upward movement, and only when the upper driving rod moves upward with a large acceleration, the first spring is elongated and the trigger collides with the T-shaped part, so that the T-shaped part generates a relative displacement action along the support.

8. The anti-reverse reactor control rod ejection device as recited in claim 2, wherein the upper section and the lower section of the trigger needle are respectively provided with a first through hole and a second through hole, a second spring is connected between the trigger needle and the top of the lower chamber, when the trigger needle is in a locked state, the trigger mechanism is inserted in the first through hole in a matching manner, and the second spring is pressurized to store force.

9. The anti-reverse reactor control rod ejection device as recited in claim 8, wherein the trigger pin is an elongated cuboid with a square cross section, the communication hole is a square hole matched with the trigger pin, and the communication hole is in clearance fit connection with the trigger pin.

10. The anti-reactor control rod ejection prevention device as recited in claim 8, wherein the support comprises two support teeth symmetrically arranged and rotatably connected to the wall surface of the accommodating cavity;

the joint of the upper driving rod and the lower driving rod is provided with a through notch together, when the trigger needle is in a locking state, the relative inner end of the supporting tooth is pressed on the trigger needle, and the outer end of the supporting tooth extends into the notch to clamp the lower driving rod; when the trigger needle moves downwards, the opposite inner end of the support tooth is inserted into the second through hole, and the outer end of the support tooth rotates inwards to be separated from the notch on the lower driving rod.

11. The anti-reverse reactor control rod ejection device as recited in claim 1, wherein a plurality of through water flow holes are formed in the circumferential direction of the upper driving rod and the lower driving rod, and the water flow holes are also formed in the junction surface of the upper driving rod and the lower driving rod.

12. A reactor comprising a core, a control rod assembly inserted into the core, and a drive mechanism for driving the control rod assembly, wherein the reactor further comprises the anti-reactor control rod springing device of any one of claims 1 to 11.

Technical Field

The invention relates to the technical field of reactor system equipment, in particular to a reactor control rod ejection prevention device and a reactor.

Background

The control rod assembly is a tool for quickly controlling reactivity, is used for adjusting the power of a reactor during normal operation, and quickly introduces negative reactivity under an accident condition, so that the reactor is emergently stopped, and the nuclear safety is ensured.

The control rod assembly consists of a spider and an absorber rod. The spider is made of stainless steel, and its central portion is a connecting handle, and its interior is connected with detachable joint on the control rod driving mechanism driving rod by means of screw thread. The spring assembly is arranged at the lower end of the connecting handle, and when the control rod falls down rapidly, the spring can play a buffering role, so that the impact of the control rod assembly on the fuel assembly is reduced. The connecting handle is provided with 16 connecting fins in a radial shape, each fin is provided with 1 or 2 fingers, each finger is provided with an absorbent rod, and the absorbent rods are fixed through threads and then fastened through pins. There are 24 absorbent rods that can be inserted into the 24 guide tubes of the corresponding fuel assembly.

The drive mechanism for the control rod assembly is a step-lift mechanism for lifting, inserting or holding the control rod assembly in place within the center to achieve reactive control. Each control rod assembly is operated by a separate control rod drive mechanism located above the pressure vessel. The control rod driving mechanism structure consists of a pin claw component, a driving rod, a pressure shell, an operating coil and a single rod position indicating coil. When the power is lost, the control rod falls into the reactor core by gravity, the maximum time of free falling from the highest position to the lowest position is 3.2s, and the maximum time allowed for falling to the buffer section is 2.15 s.

Under normal conditions, the bottom of the driving rod is connected with the connecting handle of the control rod assembly through a screw thread. If the pressure shell of the control rod driving mechanism is broken, the driving rod is out of control to pop out under the action of huge pressure difference, and then the control rod assembly is driven to be drawn out from the reactor core. If the control rod assembly which is inserted deepest and has the largest value is out of control and popped up, a large amount of positive and negative responses can be introduced into the reactor core in a short time, so that the power of the reactor core is increased suddenly, further the fuel cladding is damaged, a large amount of radioactive nuclides are released, and the personal safety of power plant workers and public personnel is threatened.

Disclosure of Invention

The invention aims to solve the technical problem of providing a reactor control rod bouncing prevention device and a reactor using the same.

The technical scheme adopted by the invention for solving the technical problems is as follows: provided is a reactor control rod ejection prevention device including:

the upper driving rod comprises an accommodating cavity inside;

the lower driving rod is detachably connected to the bottom of the upper driving rod;

the trigger assembly is arranged in the accommodating cavity and comprises a trigger mechanism and a trigger needle, the trigger mechanism is used for keeping the trigger needle in a locked state, and when the upper driving rod moves upwards at a higher acceleration, the trigger mechanism acts to trigger the trigger needle to move;

the supporting piece is arranged at the joint of the upper driving rod and the lower driving rod and is linked with the trigger needle;

when the trigger pin is in a locked state, the support piece supports the lower driving rod and is fixedly arranged at the lower part of the upper driving rod; when the trigger pin is displaced, the supporting piece is retracted, and the lower driving rod is separated from the upper driving rod and falls off under the action of gravity.

Preferably, the accommodating cavity is arranged at the upper side and the lower side inside the upper driving rod and comprises an upper cavity and a lower cavity, and a communicating hole is formed between the upper cavity and the lower cavity.

Preferably, a square boss is fixed at the bottom of the upper driving rod, and a square groove matched with the boss is formed at the top of the lower driving rod.

Preferably, the trigger mechanism is arranged in the accommodating cavity and sequentially comprises a first spring, a trigger piece and a locking mechanism from top to bottom; the upper end of the first spring is fixed at the top of the accommodating cavity, and the lower end of the first spring is fixedly connected with the trigger piece;

the locking mechanism is arranged between the trigger needle and the trigger piece, and in a locking state, the locking mechanism keeps the trigger needle in a locking state; in the triggering state, the triggering piece triggers the locking mechanism to unlock, and the triggering needle is released.

Preferably, the locking mechanism comprises a T-shaped piece, a spring piece, a twist trigger lever and an L-shaped trigger lever;

a pair of supports which are horizontally distributed at intervals are fixed in the accommodating cavity, a sliding hole is formed in the center of each support, the lower section of the T-shaped part is slidably arranged in the sliding hole in a penetrating manner, the bottom of the T-shaped part is in contact with the free end of the spring piece, and the other end of the spring piece is fixed on the inner wall of the accommodating cavity;

the twisting trigger rod is close to the lower side of the spring piece, and one end of the twisting trigger rod is rotatably connected to the inner wall of the accommodating cavity through a torsion spring;

the upper end of the L-shaped trigger rod is abutted against the free end of the twisting trigger rod, the bottom of the L-shaped trigger rod is rotatably hinged in the accommodating cavity, and the free end of the lower part of the L-shaped trigger rod locks the trigger needle;

when the spring piece is pressed and deformed downwards, the twisting trigger rod can be squeezed to rotate downwards, so that the limitation on the upper end of the L-shaped trigger rod is relieved, and the L-shaped trigger rod can rotate to unlock the trigger needle.

Preferably, under the wrench movement trigger lever natural state, the main part is the horizontal direction and distributes, with the spring leaf is parallel, L type trigger lever includes two sections mutually perpendicular stock and quarter butt, when wrench movement trigger lever level, its free end supports the stock is in vertical state, retrains L type trigger lever wrench movement.

Preferably, the spring constant of the first spring, the weight of the trigger member and the distance between the trigger member and the T-shaped member in normal suspension are matched with the upward acceleration of the upper driving rod, and only when the upper driving rod moves upward with a large acceleration, the first spring is elongated, and the trigger member collides with the T-shaped member, so that the T-shaped member performs a relative displacement action along the support.

Preferably, the upper section and the lower section of the trigger needle are respectively provided with a first through hole and a second through hole, a second spring is connected between the trigger needle and the top of the lower chamber, when the trigger needle is in a locking state, the trigger mechanism is matched and inserted in the first through hole, and the second spring is pressed to store force.

Preferably, the trigger needle is long and thin cuboid, and the cross section is the square, the intercommunicating pore be with the quad slit of trigger needle adaptation, the intercommunicating pore with the trigger needle clearance fit is connected.

Preferably, the supporting part comprises two symmetrically arranged supporting teeth which are rotatably connected to the wall surface of the accommodating cavity;

the joint of the upper driving rod and the lower driving rod is provided with a through notch together, when the trigger needle is in a locking state, the relative inner end of the supporting tooth is pressed on the trigger needle, and the outer end of the supporting tooth extends into the notch to clamp the lower driving rod; when the trigger needle moves downwards, the opposite inner end of the support tooth is inserted into the second through hole, and the outer end of the support tooth rotates inwards to be separated from the notch on the lower driving rod.

Preferably, a plurality of through water flow holes are formed in the circumferential direction of the upper driving rod and the lower driving rod, and the water flow holes are also formed in the joint surface of the upper driving rod and the lower driving rod.

The invention also provides a reactor, which comprises a pressure vessel, a reactor core, a control rod assembly inserted into the reactor core, a driving mechanism for driving the control rod assembly and other components, and the reactor also comprises the anti-reactor control rod bouncing device.

The implementation of the invention has at least the following beneficial effects:

the invention utilizes the design that the upper driving rod and the lower driving rod can be separated, and the trigger mechanism is triggered to respond when the upper driving rod moves upwards at a larger acceleration, the trigger mechanism acts to push the trigger needle to displace, when the trigger needle displaces, the supporting piece is retracted, and the lower driving rod is separated from the upper driving rod and falls off under the action of gravity. Under the accident condition that the pressure shell of the control rod driving mechanism is broken, the upper driving rod is upwards popped out at a high acceleration, and the triggering mechanism responds to the driving rod, so that the upper driving rod and the lower driving rod are separated. The upper driving rod is upwards popped out under the pushing of the pressure difference, the lower driving rod and the control rod assembly fall under the action of gravity and are inserted into the reactor core, the driving rod and the control rod assembly are automatically disconnected, the out-of-control popping of the control rods is avoided, the reactor core is ensured not to introduce a large amount of positive and negative reactions in a short time, the probability of cladding damage is reduced, and the safety of the reactor is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the status of an un-triggered front trigger pin and an L-shaped trigger bar according to the present invention;

FIG. 2 is a schematic diagram of the status of the trigger pin and the supporting member after triggering according to the present invention;

FIG. 3 is a schematic view of the connection between the drive rod and the control rod assembly of the integrated device of the present invention;

FIG. 4 is a schematic view of the trigger mechanism of the present invention inside the upper chamber;

FIG. 5 is a cross-sectional view of the firing pin of the present invention;

the reference numerals in the drawings denote: 1-an upper drive rod; 2-lower drive rod; 3-trigger needle; 4-a support; 5-a first spring; 6-a trigger; 7-T-shaped part; 8-spring leaf; 9-twisting the trigger lever; a 10-L-shaped trigger lever; 11-a scaffold; 12-a support table; 13-a second spring; 14-notches; 15-water holes; 16-a connecting plate; 17-a drive rod; 18-a control rod assembly; 101-an upper chamber; 102-a lower chamber; 103-communicating hole; 104-boss; 201-grooves; 301-a first through-going hole; 302-a second through hole; 1001-long rod; 1002-short bar; 1101 — slide hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

referring to fig. 1-4, a main body of the device is used for connecting between a control rod assembly 18 and a drive rod 17 of a drive mechanism, the main body of the device comprises an upper drive rod 1, and the upper drive rod 1 internally comprises a containing cavity; the lower driving rod 2 is detachably connected to the bottom of the upper driving rod 1; the upper driving rod 1 and the lower driving rod 2 are both made of steel alloy materials. It will be appreciated that in some embodiments, the anti-reactor control rod ejection prevention device may be used in a reactor, the reactor may include a core, a control rod assembly inserted into the core, a driving mechanism for driving the control rod assembly, and the like, and the anti-reactor control rod ejection prevention device is connected between the control rod assembly and the driving mechanism, so that an ejection accident of the reactor control rod assembly can be effectively prevented.

A trigger assembly is arranged between the upper driving rod 1 and the lower driving rod 2, is arranged in the accommodating cavity and comprises a trigger mechanism and a trigger needle 3, the trigger mechanism is used for keeping the trigger needle 3 in a locking state, and when the upper driving rod 1 moves upwards at a higher acceleration, the trigger mechanism acts to cause the trigger needle 3 to displace;

the support piece 4 is arranged at the joint surface of the upper driving rod 1 and the lower driving rod 2 and is linked with the trigger needle 3; when the trigger pin 3 is in a locked state, the support 4 supports the lower driving rod 2 and is fixedly arranged at the lower part of the upper driving rod 1; when the trigger pin 3 is displaced, the support member 4 is retracted, and the lower drive rod 2 is separated from the upper drive rod 1 and falls off by gravity. In the embodiment, when the supporting member 4 is unfolded to the maximum supporting arm extension, the lifting lower driving rod 2 is fixedly arranged at the bottom of the upper driving rod 1; when the trigger pin 3 is displaced, the support member 4 is retracted, and the lower drive rod 2 is separated from the upper drive rod 1 and falls off by gravity.

When the device is used and installed, the lower driving rod 2 is connected with the connecting handle of the control rod assembly 18 through screw threads, and the upper driving rod 1 is connected with the detachable joint on the driving rod 17 of the control rod driving mechanism through screw threads.

Referring to fig. 1, in the present embodiment, the receiving chamber includes an upper chamber 101 and a lower chamber 102 provided at upper and lower sides inside the upper driving rod, which are communicated with each other through a communication hole 103. When realizing that lower part actuating lever 2 can dismantle with upper portion actuating lever 1 and be connected, the bottom of upper portion actuating lever 1 is fixed with a boss 104, and the top of lower part actuating lever 2 is formed with the recess 201 that matches with boss 104, and both just match the straining, and wherein, this boss 104 can be square boss, the recess 201 that corresponds is square groove for relative wrench movement can not take place between the two. Meanwhile, in the present embodiment, the water flowing hole 15 is preferably disposed at the joint surface of the upper driving rod 1 and the lower driving rod 2, i.e., at the contact surface of the groove 201 matched with the boss 104, so as to ensure that the upper driving rod 1 and the lower driving rod 2 can be quickly separated when being separated.

Wherein, the trigger mechanism is arranged in the upper chamber 101, and specifically comprises a first spring 5, a trigger piece 6 and a locking mechanism in sequence from top to bottom in the upper chamber 101. The upper end of the first spring 5 is fixed on the top of the containing cavity, and the lower end is fixedly connected with the trigger piece 6. In this embodiment, the triggering member 6 may be a steel ball, the weight of which can be adjusted according to actual needs, and the inertia of the steel ball is used as the trigger to unlock the collision locking mechanism.

The locking mechanism is arranged between the trigger needle 3 and the trigger piece 6, and in a locking state, the locking mechanism keeps the trigger needle 3 in a locking state; in the activated state, the trigger 6 activates the locking mechanism to unlock, releasing the trigger pin 3.

In this embodiment, the locking mechanism includes a tee 7, a spring plate 8, a twist trigger lever 9 and an L-shaped trigger lever 10. The upper end of the first spring 5 is fixed on the top of the upper chamber 101, the lower end is fixedly connected with the trigger 6, a pair of brackets 11 which are horizontally distributed at intervals are fixed in the upper chamber 101, a sliding hole 1101 is arranged at the center of the bracket 11, the lower section of the T-shaped part 7 is arranged in the sliding hole 1101 in a sliding manner, the bottom of the T-shaped part 7 is contacted with the free end of the spring piece 8, and the other end of the spring piece 8 is fixed on the inner wall of the upper chamber 101 through a connecting plate 16. The twist trigger lever 9 is close to the lower side of the spring plate 8, and one end thereof is rotatably connected to the inner wall of the upper chamber 101 by a torsion spring.

The bottom of the L-shaped trigger lever 10 is hinged to the support base 12 through a torsion spring and can swing around the support base 12, and the support base 12 is fixed on the inner wall of the bottom of the upper chamber 101. It can be understood that the L-shaped trigger lever 10 can also be rotatably mounted on the inner wall of the accommodating cavity directly through the rotating shaft. The upper end of the L-shaped trigger rod 10 is abutted against the free end of the twisting trigger rod 9, the bottom of the L-shaped trigger rod 10 is rotatably hinged in the accommodating cavity, and the lower free end of the L-shaped trigger rod 10 locks the trigger needle 3.

When the spring piece 8 is pressed and deformed downwards, the pressing and twisting trigger rod 9 rotates downwards to release the limitation of the upper end of the L-shaped trigger rod 10, so that the L-shaped trigger rod 10 can rotate to release the locking of the trigger needle 3.

The main body of the trigger needle 3 passes through the communication hole 103, the upper and lower sections of the trigger needle 3 are respectively provided with a first through hole 301 and a second through hole 302, a second spring 13 is connected between the trigger needle 3 and the top of the lower chamber 102, when the trigger needle 3 is in a locking state, the short rod 1002 of the L-shaped trigger rod 10 is matched and inserted in the first through hole 301, and the second spring 13 is pressurized and accumulated. Preferably, the trigger pin 3 is an elongated rectangular parallelepiped with a square cross section, the communication hole 103 is a square hole adapted to the trigger pin 3, and the communication hole 103 is connected with the trigger pin 3 in a clearance fit manner, so that the trigger pin 3 can only perform piston movement in the up-and-down direction, but cannot perform twisting.

Preferably, twist the trigger bar 9 under the natural state, the main part is the horizontal direction and distributes, and is parallel with spring leaf 8, and L type trigger bar 10 comprises two sections mutually perpendicular stock 1001 and quarter butt 1002, and when twisting the trigger bar 9 level, its free end supports stock 1001 and is in vertical state, retrains L type trigger bar 10 and twists. By utilizing the rotation limiting constraint of the L-shaped trigger rod 10, the short rod 1002 of the L-shaped trigger rod 10 is matched and inserted in the first through hole 301, so that the downward displacement of the trigger needle 3 is limited and the trigger needle is kept fixed. Meanwhile, due to the design, when the spring piece 8 is pressed downwards and slightly deformed, the trigger rod 9 can be pressed and twisted to rotate downwards. Therefore, the L-shaped trigger rod 10 is released by utilizing the separation of the free end of the twisting trigger rod 9, so that the L-shaped trigger rod 10 rotates under the action of the torsion spring, the short rod 1002 of the L-shaped trigger rod 10 is separated from the first through hole 301 of the trigger needle 3, and the release of the trigger needle 3 from the locking state is completed.

Referring to fig. 1, 2 and 5, the supporting member 4 in this embodiment includes two supporting teeth symmetrically arranged, the supporting teeth are substantially triangular, and are coupled to the wall surface of the lower chamber 102 in a rotating manner by a torsion spring, a through notch 14 is formed at the joint of the upper driving rod 1 and the lower driving rod 2, when the trigger pin 3 is in a locked state, the inner end of the supporting teeth is pressed against the trigger pin 3, and the outer end of the supporting teeth extends into the notch 14 to clamp the lower driving rod 2, so as to fixedly connect the lower driving rod 2 to the bottom of the upper driving rod 1. When the trigger pin 3 is displaced downwards along the communication hole 103, the opposite inner end of the support tooth is inserted into the second through hole 302, and the outer end thereof rotates inwards to be separated from the notch 14 on the lower drive rod 2, so that the lower drive rod 2 sleeved at the bottom of the upper drive rod 1 automatically falls off under the action of gravity.

In this embodiment, preferably, a plurality of through water flow holes 15 are formed in the circumferential direction of the upper driving rod 1 and the lower driving rod 2, and a plurality of water flow holes 15 are dug in the circumferential direction of the upper driving rod 1, so that the upper chamber 101 is communicated with the external environment, and the coolant in the chamber can freely enter and exit through the water flow holes 15, thereby ensuring that the trigger 6 can freely move up and down in the chamber without being subjected to excessive resistance. The number and inner diameter parameters of the water flow holes 15 are related to the volume and the mass of the trigger piece 6, and can be optimized according to actual needs.

The working principle of the device is as follows: before the trigger mechanism is triggered, the upper driving rod 1 and the lower driving rod 2 are in a buckling state, and the supporting teeth can bear the gravity of the lower driving rod 2 and the control rod assembly 18, so that the upper driving rod 1 and the lower driving rod 2 are connected together.

In the event of a rod ejection accident, the pressure at the top of the drive rod 17 of the drive mechanism is suddenly reduced to one atmosphere, while the pressure at the bottom of the drive rod 17 is maintained at 10⁷Pa magnitude (corresponding to pressure of about 15.5MPa for pressurized water reactor example), the upper driving rod 1 is driven by the pressure generated by the huge pressure difference between the upper end and the lower end, and is popped up at a great acceleration, andbringing the top of the first spring 5 upwards. Due to the inertia of the trigger piece 6, there is a tendency to maintain the original static state, so that the spring is elongated and further collides with the T-shaped piece 7 moving upwards along with the upper driving rod 1 and the trigger piece 6, so that the T-shaped piece 7 is inserted downwards, the trigger twisting trigger rod 9 swings downwards, and the L-shaped trigger rod 10 also swings downwards, so that the trigger pin 3 is released. Under the thrust action of the second spring 13, the trigger pin 3 moves downwards, so that the lower through hole of the trigger pin 3 is aligned with the pressing end of the support tooth, the pressing end loses the support effect, the support tooth is twisted downwards under the gravity action of the lower driving rod 2 and the control rod assembly 18, and the pressing end enters the lower through hole, so that the upper driving rod 2 and the lower driving rod 2 are separated. The upper drive rod 1 is then ejected upward by the pressure differential, and the lower drive rod 2 and control rod assembly 18 fall under gravity and are inserted into the reactor core. The out-of-control ejection of the control rod is avoided, the reactor core is ensured not to introduce a large amount of positive and negative reactions in a short time, the probability of cladding damage is reduced, and the safety of the reactor is improved.

Among them, it is noteworthy that: the elastic coefficient of first spring 5, the weight of trigger 6 and when normally hanging trigger 6 and T type spare 7 between the distance need match each other according to the acceleration of upper portion actuating lever 1, guarantee that trigger 6 can not miss collision steel needle when normal operating, only bump under the bullet stick operating mode, trigger T type spare 7 and insert the action down. The acceleration of the upper driving rod 1 is related to the operating pressure of the reactor, the cross-sectional area of the driving rod and the mass of the upper driving rod 1, so that the rod ejection prevention and control device needs to be designed according to a specific reactor, but the implementation of the principle of the scheme is not influenced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.