阅读说明：本技术 控制棒驱动机构及具有其的反应堆 (Control rod driving mechanism and reactor with same ) 是由 彭朝晖 郭志家 张金山 刘兴民 柯国土 衣大勇 范月容 周寅鹏 孙征 姚成志 石 于 2020-07-28 设计创作，主要内容包括：本发明的实施例公开了一种控制棒驱动机构及具有其的反应堆,包括：壳体,固定设置,壳体具有容置通道；传动结构,至少部分设置在容置通道内,传动结构可沿容置通道移动,传动结构在其移动方向上具有第一端和第二端,传动结构的第一端与控制棒连接；驱动结构,与传动结构的第二端驱动连接,以驱动传动结构移动；弹性件,设置于容置通道和传动结构之间,弹性件对传动结构加朝向控制棒的弹性力。本发明的技术方案能够在反应堆处于摇摆、倾斜状态时将控制棒压紧在堆芯上,避免控制棒晃动或脱离堆芯,控制棒能够按照要求升降,从而保证了反应堆的生产运行。(The embodiment of the invention discloses a control rod driving mechanism and a reactor with the same, comprising: the shell is fixedly arranged and provided with an accommodating channel; the transmission structure is at least partially arranged in the accommodating channel and can move along the accommodating channel, the transmission structure is provided with a first end and a second end in the moving direction, and the first end of the transmission structure is connected with the control rod; the driving structure is in driving connection with the second end of the transmission structure so as to drive the transmission structure to move; and the elastic piece is arranged between the accommodating channel and the transmission structure and applies elastic force towards the control rod to the transmission structure. According to the technical scheme, the control rods can be tightly pressed on the reactor core when the reactor is in a swinging and inclining state, the control rods are prevented from shaking or separating from the reactor core, and the control rods can be lifted as required, so that the production operation of the reactor is ensured.)

1. A control rod drive mechanism, comprising:

a housing (10) fixedly arranged, the housing (10) having an accommodating channel (11);

a transmission structure (20) at least partially arranged in the accommodating channel (11), wherein the transmission structure (20) can move along the accommodating channel (11), the transmission structure (20) is provided with a first end and a second end in the moving direction, and the first end of the transmission structure (20) is connected with a control rod (200);

the driving structure (30) is in driving connection with the second end of the transmission structure (20) so as to drive the transmission structure (20) to move;

an elastic member (40) disposed between the receiving channel (11) and the transmission structure (20), the elastic member (40) applying an elastic force to the transmission structure (20) toward the control rod (200).

2. The crdm as set forth in claim 1, wherein:

the driving structure (30) and the transmission structure (20) can be selectively connected or disconnected.

3. The crdm as set forth in claim 2, wherein:

the elastic piece (40) always applies the elastic force to the transmission structure (20) when the driving structure (30) is connected and/or disconnected with the transmission structure (20).

4. The crdm as set forth in claim 3, wherein:

the spring force is greater than the sum of the weight forces of the transmission structure (20) and the control rod (200).

5. The crdm as set forth in claim 2, further comprising:

and the connecting and disconnecting device (60) is connected between the driving structure (30) and the transmission structure (20), and the connection or disconnection of the driving structure (30) and the transmission structure (20) is realized through the connecting and disconnecting device (60).

6. The crdm as set forth in claim 1, further comprising:

a flexible connection (70) connected between the drive structure (30) and the transmission structure (20).

7. The crdm as set forth in claim 1, further comprising:

position detection means (50) for detecting the position of the transmission structure (20) in the direction of movement thereof.

8. The crdm as set forth in claim 7, further comprising:

a sensing portion provided on at least part of the transmission structure (20), the sensing portion cooperating with the position detection device (50).

9. The crdm as set forth in claim 1, further comprising:

the first limiting part (12) is arranged on the inner wall of the accommodating channel (11);

the second limiting part (21) is arranged on the transmission structure (20);

the first limiting part (12) and the second limiting part (21) are matched with two ends of the elastic piece (40) respectively.

10. The crdm as set forth in claim 9, wherein:

the elastic force is pressure, and the first limiting part (12) is located between the second limiting part (21) and the driving structure (30).

11. The crdm as set forth in claim 9, wherein:

the elastic force is tensile force, the second limiting part (21) is located between the first limiting part (12) and the driving structure (30), and two ends of the elastic piece (40) are fixedly connected with the first limiting part (12) and the second limiting part (21) respectively.

12. The crdm as set forth in claim 9, wherein:

the first limiting part (12) extends along the circumferential direction of the inner wall of the accommodating channel (10) to form a ring shape; and/or the presence of a gas in the gas,

the second limiting portion (21) extends along the circumferential direction of the outer wall of the transmission structure (20) to form a ring shape.

13. The crdm as set forth in claim 1, wherein:

the transmission structure (20) is rod-shaped, the elastic piece (40) is a spring, and the spring is sleeved on the transmission structure (20).

14. The crdm as set forth in claim 5, further comprising:

more than two guiding parts, wherein one part of the guiding parts is arranged at the first end of the transmission structure (20), the other part of the guiding parts is arranged at the connecting and disconnecting device (60) and/or the second end of the transmission structure (20), and when the driving structure (30) is connected with the transmission structure (20) and the transmission structure (20) moves, at least one guiding part is positioned in the accommodating channel (11) and is in sliding fit with the inner wall of the accommodating channel (11).

15. The crdm as set forth in claim 14, wherein:

the first end of the transmission structure (20) is provided with a joint (22), the joint (22) is connected with the control rod (200), the joint (22) can move in the accommodating channel (10), and at least part of the circumferential outer wall of the joint (22) forms one of more than two guide parts.

16. The crdm as set forth in claim 15, wherein:

the joint (22) is detachably arranged with the transmission structure (20).

17. The crdm as set forth in claim 14, wherein:

the connecting and disconnecting device (60) can move in the accommodating channel (10), and at least part of the circumferential outer wall of the connecting and disconnecting device (60) forms one of more than two guide parts.

18. A reactor, comprising:

a control rod (200) and a control rod drive mechanism (100), wherein the control rod drive mechanism (100) is as defined in any one of claims 1 to 17.

Technical Field

The invention relates to the field of reactors, in particular to a control rod driving mechanism and a reactor with the same.

Background

Control rod drive mechanisms are important equipment for ensuring production operation and safety control of reactors. In the prior art, the control rod drive mechanism is only suitable for a stable land-based reactor, and the prior control rod drive mechanism cannot meet the use requirement under the swinging and inclining environment (such as a marine reactor applied to the sea).

Disclosure of Invention

In view of the above problems, the present invention has been made to provide a control rod drive mechanism and a reactor having the same that overcome or at least partially solve the above problems.

To achieve the above object, according to one aspect of the present invention, there is provided a control rod drive mechanism including: the shell is fixedly arranged and provided with an accommodating channel; the transmission structure is at least partially arranged in the accommodating channel and can move along the accommodating channel, the transmission structure is provided with a first end and a second end in the moving direction, and the first end of the transmission structure is connected with the control rod; the driving structure is in driving connection with the second end of the transmission structure so as to drive the transmission structure to move; and the elastic piece is arranged between the accommodating channel and the transmission structure and applies elastic force towards the control rod to the transmission structure.

Further, the driving structure and the transmission structure can be selectively connected or disconnected.

Further, the elastic member always applies elastic force to the transmission structure when the connection and/or disconnection between the driving structure and the transmission structure.

Further, the elastic force is greater than the sum of the gravity of the transmission structure and the control rod.

Further, the control rod drive mechanism further comprises: and the connecting and disconnecting device is connected between the driving structure and the transmission structure and realizes the connection or disconnection of the driving structure and the transmission structure through the connecting and disconnecting device.

Further, the control rod drive mechanism further comprises: and the flexible connecting piece is connected between the driving structure and the transmission structure.

Further, the control rod drive mechanism further comprises: and the position detection device is used for detecting the position of the transmission structure in the moving direction of the transmission structure.

Further, the control rod drive mechanism further comprises: the sensing part is arranged on at least part of the transmission structure and is matched with the position detection device.

Further, the control rod drive mechanism further comprises: the first limiting part is arranged on the inner wall of the accommodating channel; the second limiting part is arranged on the transmission structure; wherein, the first limit part and the second limit part are respectively matched with the two ends of the elastic piece.

Furthermore, the elastic force is pressure, and the first limiting part is positioned between the second limiting part and the driving structure.

Furthermore, the elastic force is a pulling force, the second limiting part is positioned between the first limiting part and the driving structure, and two ends of the elastic piece are respectively fixedly connected with the first limiting part and the second limiting part.

Furthermore, the first limiting part extends along the circumferential direction of the inner wall of the accommodating channel to form a ring; and/or the second limiting part extends along the circumferential direction of the outer wall of the transmission structure to form a ring shape.

Furthermore, the transmission structure is rod-shaped, the elastic element is a spring, and the spring is sleeved on the transmission structure.

Furthermore, more than two guide parts are arranged, one part of the guide parts is arranged at the first end of the transmission structure, the other part of the guide parts is arranged on the connecting and disconnecting device and/or the second end of the transmission structure, and when the driving structure is connected with the transmission structure and the transmission structure moves, at least one guide part is positioned in the accommodating channel and is in sliding fit with the inner wall of the accommodating channel.

Further, the first end of the transmission structure is provided with a joint, the joint is connected with the control rod through the joint and can move in the accommodating channel, and at least part of the circumferential outer wall of the joint forms one of more than two guide parts.

Further, the joint and the transmission structure are detachably arranged.

Further, the connecting and disconnecting device is movable within the receiving channel, at least part of the circumferential outer wall of the connecting and disconnecting device forming one of the two or more guides.

According to another aspect of the present invention, there is provided a reactor comprising: the control rod driving mechanism is the control rod driving mechanism.

By applying the technical scheme of the invention, the elastic piece is arranged between the transmission structure and the accommodating channel and always applies elastic force towards the control rod to the transmission structure. When the reactor is in a swinging and inclining state, the control rods can be tightly pressed on the reactor core under the action of the elastic force, the control rods are prevented from shaking or being separated from the reactor core, and the control rods can be lifted as required, so that the production operation of the reactor is ensured.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a control rod drive mechanism according to a first embodiment of the present invention; and

FIG. 2 shows a schematic structural diagram of a control rod drive mechanism according to a second embodiment of the present invention.

It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.

Description of reference numerals:

100. a control rod drive mechanism; 10. a housing; 11. an accommodating channel; 12. a first limiting part; 20. a transmission structure; 21. a second limiting part; 22. a joint; 30. a drive structure; 40. an elastic member; 50. a position detection device; 60. a connecting and disconnecting device; 70. a flexible connector; 200. a control rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.

It is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. In addition, if "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" including either scheme A, or scheme B, or schemes in which both A and B are satisfied.

Fig. 1 is a schematic structural diagram of a crdm 100 according to a first embodiment of the present invention.

As shown in fig. 1, the crdm 100 according to the first embodiment includes a housing 10, a transmission structure 20, a drive structure 30, and a resilient member 40. Wherein, the housing 10 is fixedly arranged, and the housing 10 has an accommodating channel 11. The transmission structure 20 is at least partially disposed in the accommodating passage 11. The transmission structure 20 can move along the accommodating channel 11. The transmission structure 20 has a first end and a second end in its direction of movement. A first end of the transmission structure 20 is connected with the control rod 200. The driving structure 30 is in driving connection with the second end of the transmission structure 20 to drive the transmission structure 20 to move along the accommodating channel 11 of the housing 10. The transmission structure 20 and the control rods 200 disposed at the first end thereof reciprocate along the receiving passage 11 under the driving of the driving structure 30, thereby achieving the elevation of the control rods 200 within the core. The elastic member 40 is disposed between the accommodating passage 11 and the transmission structure 20. The elastic member 40 applies an elastic force to the transmission structure 20 toward the control rods 200. In the present embodiment, the control rod drive mechanism 100 is applied to a marine reactor in the sea, the control rod drive mechanism 100 is disposed at the upper portion of a core structure of the reactor, the housing 10 is fixed to a reactor component, and the control rod drive mechanism 100 is used to drive the elevation and the retention of the control rods 200 in the core, thereby controlling the reactivity in the core.

With the control rod drive mechanism 100 of the present embodiment, the elastic member 40 is disposed between the receiving passage 11 and the transmission structure 20, and the elastic member 40 always applies an elastic force to the transmission structure 20 in the direction of the control rods 200. When the reactor is in a swinging and inclining state, the control rods 200 can be tightly pressed on the reactor core under the action of the elastic force, the control rods 200 are prevented from shaking or being separated from the reactor core, and the control rods 200 can be lifted as required, so that the production operation of the reactor is ensured.

It should be noted that the control rod drive mechanism 100 of the present embodiment is applied to a marine reactor in the sea, but the application scenario of the control rod drive mechanism 100 is not limited to this, and in other embodiments, the control rod drive mechanism 100 may be applied to other environmental conditions where sway and tilt may occur.

As shown in fig. 1, in the crdm 100 according to the first embodiment, the drive structure 30 and the transmission structure 20 may be selectively connected or disconnected. The drive structure 30 is coupled with the transmission structure 20 when the control rod drive mechanism 100 normally drives the control rods 200 up and down and holds them. When an accident such as impact or overturning occurs or other emergency shutdown is required, the driving structure 30 is disconnected from the transmission structure 20, and the control rods 200 are completely inserted into the core of the reactor by the elastic force of the elastic members 40 and the self-weights of the control rod driving mechanism 100 and the control rods 200, thereby achieving emergency shutdown of the reactor. In addition, the elastic force of the elastic member 40 provides acceleration power for dropping the control rod 200, thereby achieving rapid dropping of the control rod 200.

In the first embodiment shown in fig. 1, the elastic force of the elastic member 40 is a pressure force, and the elastic member 40 is always in a compressed state. When the drive structure 30 drives the drive structure 20 to lift the control rod 200, the elastic member 40 is gradually compressed to accumulate elastic potential energy, and after the drive structure 30 is disconnected from the drive structure 20, the elastic member 40 releases the elastic potential energy accumulated during the lifting process to provide acceleration power for dropping the control rod 200, and insertion of the control rod 200 is performed by the gravity of the drive structure 20 and the control rod 200.

In the control rod drive mechanism 100 of the first embodiment, the elastic force is greater than the sum of the gravity of the transmission structure 20 and the control rods 200.

The elastic member 40 is provided such that the force applied to the side of the transmission structure 20 facing the control rods 200 is always greater than the gravity of the transmission structure 20 and the control rods 200, in the sense that the control rods 200 do not fall off the core of the reactor when the reactor is overturned. Specifically, when the reactor topples, the elastic force applied by the elastic member 40 can overcome the gravity of the transmission structure 20 and the control rods 200, so that the control rods 200 are reliably and stably held in the reactor core without falling off, and the safety of the reactor is ensured.

It should be noted that the relationship between the elastic force and the sum of the gravity of the transmission structure 20 and the control rods 200 is not limited to this, and in other embodiments, the elastic force may be smaller than or equal to the sum of the gravity of the transmission structure 20 and the gravity of the control rods 200, and in this case, although the drop prevention function is not performed when the reactor topples, the elastic force is calculated to have a magnitude that can still perform the function of preventing the control rods 200 from dropping when the reactor is in a sway or tilt state.

As shown in fig. 1, in the crdm 100 according to the first embodiment, the crdm 100 further includes a connecting and disconnecting device 60. The connecting and disconnecting device 60 is connected between the drive structure 30 and the transmission structure 20. The connection or disconnection of the drive structure 30 to the transmission structure 20 is effected by a connecting/disconnecting device 60.

When an accident occurs to the reactor or when the reactor needs to be stopped under other conditions, the connection and disconnection device 60 receives a disconnection signal and disconnects the connection between the driving structure 30 and the transmission structure 20, specifically, the connection and disconnection device 60 is always connected to the driving structure 30, and the connection and disconnection device 60 is disconnected from the transmission structure 20 after receiving the disconnection signal. Of course, in other embodiments, the connecting and disconnecting device 60 may be connected to the transmission structure 20 at all times, and the connecting and disconnecting device 60 and the driving structure 30 may be disconnected after receiving the disconnection signal.

In the present embodiment, the connecting and disconnecting device 60 employs an electromagnetic assembly, and controls the engagement between the transmission structure 20 and the driving structure 30 through electromagnetic force. Of course, the specific structure of the connecting device 60 is not limited to this, and in other embodiments, a pneumatic latch assembly or other devices capable of achieving the same function may be used as the connecting device 60.

As shown in fig. 1, in the crdm 100 according to the first embodiment, the crdm 100 further includes a flexible connection 70. The flexible connection 70 is connected between the drive structure 30 and the transmission structure 20. In this embodiment, the flexible connector 70 is of a wire rope construction.

In the control rod drive mechanism 100 of the embodiment, the drive structure 30 is connected with the transmission structure 20 through the flexible connection member 70, the drive structure 30 drives the transmission structure 20 to ascend and descend through the flexible connection member 70, and during rod lifting, the drive structure 30 lifts the control rod 200 against the gravity of the transmission structure 20 and the control rod 200 and the elastic force of the elastic member 40. In the rod dropping process, since the driving structure 30 is connected with the transmission structure 20 through the flexible connection member 70, the rod dropping is performed by adjusting the magnitude of the pulling force of the driving structure 30, depending on the gravity of the transmission structure 20 and the control rods 200 and the elastic force of the elastic member 40. The speed and acceleration of the falling rod can be controlled by adjusting the tension of the driving structure 30.

Because the driving structure 30 is connected with the transmission structure 20 through the flexible connection member 70, if the elastic member 40 is not provided, the transmission structure 20 and the control rods 200 are more likely to shake or even separate from the core due to the lack of rigid constraint at the top of the transmission structure 20 when the reactor is in a sway and tilt state. In the embodiment, the elastic member 40 is provided, so that the control rod 200 is not pressed by the elastic force of the elastic member 40, thereby improving the safety of the whole reactor.

In other embodiments, the driving structure 30 and the transmission structure 20 may be connected by a rigid member, and even if the driving structure 30 and the transmission structure 20 are connected by a rigid member, the control rods 200 may be moved and detached from the core when the reactor is in a sway or tilt condition.

In this embodiment, the connection and disconnection device 60 may be used to control connection and disconnection between the flexible connection member 70 and the transmission structure 20, and when the reactor control system determines that an accident occurs in the reactor, the reactor control system controls the connection and disconnection device 60 to disconnect the flexible connection member 70, so as to realize disconnection between the flexible connection member 70 and the transmission structure 20, thereby performing rapid rod drop by means of the gravity of the transmission structure 20 and the control rod 200 and the elastic force of the elastic member 40.

It should be noted that in the present embodiment, the flexible connection member 70 is directly connected between the connecting and disconnecting device 60 and the driving structure 30. Of course, the arrangement of the flexible connector 70 and the connecting and disconnecting device 60 is not limited thereto, and in other embodiments, the connecting and disconnecting device 60 may be directly connected between the flexible connector 70 and the driving structure 30. In other embodiments, the connection device 60 may not be provided, the flexible connection member 70 may be directly connected to the driving structure 30 and the transmission structure 20, and the flexible connection member 70 may be cut off to disconnect the driving structure 30 and the transmission structure 20.

As shown in fig. 1, in the crdm 100 according to the first embodiment, the crdm 100 further includes a position detecting device 50. The position detection device 50 is used to detect the position of the transmission structure 20 in its moving direction.

The position detecting device 50 is used for detecting the position of the transmission structure 20 in the moving direction, and further knowing the position of the control rod 200 in the reactor core, and the control system of the reactor acquires the position information of the control rod 200 through the position detecting device 50, so as to further adjust the position according to the reactivity requirement of the reactor.

In addition, the control rod drive mechanism 100 includes a sensing portion. A sensing portion is provided on at least a portion of the transmission structure 20, the sensing portion cooperating with the position detection device 50. In the present embodiment, a part of the transmission structure 20 itself is provided as the sensing portion. Of course, in other embodiments, the entire transmission structure 20 may be provided as the sensing portion.

In the present embodiment, the position detection device 50 is provided on the outer wall of the housing 10. The position detecting device 50 includes a detection coil, and the sensing portion formed by a portion of the transmission structure 20 itself is a magnetizer, and the magnetizer moves in the detection coil, and the coil can sense the position signal of the transmission structure 20, thereby monitoring the specific position of the control rod 200 in real time. Specifically, the movement path information of the sensing portion is fed back to the reactor control system, and the reactor acquires information of the control rods 200 in the core, thereby further regulating the elevation and maintenance of the control rods 200 in the core of the reactor.

It should be noted that the installation position of the position detection device 50 is not limited to this, and in other embodiments, the position detection device 50 may be installed on the inner wall of the accommodating passage 11 or outside the housing 10. In addition, the specific form of the position detection device 50 and the sensing part is not limited thereto, and in other embodiments, the position detection device 50 may be a magnetizer structure disposed on the inner wall of the accommodating passage 11 or the housing 10, that is, a part or all of the housing 10 is provided with the magnetizer structure. The induction part may be a coil structure, and is disposed on a corresponding portion of the transmission structure 20.

As shown in fig. 1, the crdm 100 according to the first embodiment further includes a first stopper portion 12 and a second stopper portion 21. The first limiting portion 12 is disposed on an inner wall of the accommodating passage 11. The second limiting portion 21 is disposed on the transmission structure 20. The first position-limiting portion 12 and the second position-limiting portion 21 are respectively engaged with two ends of the elastic element 40.

In the crdm 100, the elastic element 40 is disposed between the receiving channel 11 and the transmission structure 20, wherein a first limiting portion 12 is disposed on an inner wall of the receiving channel 11, a second limiting portion 21 is disposed on the transmission structure 20, and the two limiting portions are disposed in cooperation with the elastic element 40. Optionally, the elastic element 40 is a spring device, and two ends of the spring device are respectively disposed in cooperation with the two limiting portions.

In the first embodiment, the elastic force is a pressure force, and the first position-limiting portion 12 is located between the second position-limiting portion 21 and the driving structure 30.

As shown in fig. 1, in the crdm 100 according to the first embodiment, the elastic force of the elastic member 40 to the transmission structure 20 is a pressure force, and at this time, both ends of the elastic member 40 and the stopper portions are elastically disposed, and may be fixedly connected to the both stopper portions or not. In this embodiment, the elastic member 40 is a spring device, two ends of the spring device are disposed in cooperation with the two limiting portions, the first limiting portion 12 is located between the second limiting portion 21 and the driving structure 30, and the spring device sets a corresponding pre-compression amount so that pressure toward the control rod 200 is always applied to the driving structure 30. Meanwhile, the spring is gradually compressed to accumulate elastic potential energy during the lifting of the control rod 200, so that the elastic potential energy accumulated during the lifting is released to provide acceleration power to the control rod 200 when the rod is dropped. The lifting and lowering of the control rod 200 and the rapid rod drop can be normally realized under the conditions of swinging and inclination by matching the gravity of the transmission structure 20 and the control rod 200.

In the present embodiment, the pressure that can be generated by the pre-compression amount of the spring means is set to be greater than the sum of the gravity of the power transmission structure 20 and the control rods 200, which is set such that the control rods 200 do not suffer from a rod ejection accident in the event of the reactor tipping.

As shown in fig. 1, in the crdm 100 according to the first embodiment, the first stopper portion 12 extends in the circumferential direction of the inner wall of the receiving passage 11 to form a ring shape, and the second stopper portion 21 extends in the circumferential direction of the outer wall of the transmission structure 20 to form a ring shape.

Specifically, the first position-limiting portion 12 is annular and disposed on the inner wall of the accommodating channel 11, and the diameter of the inner hole is larger than the outer diameter of the transmission structure 20, so that the transmission structure 20 is not affected when passing through the first position-limiting portion 12. In the present embodiment, the first stopper portion 12 is provided as an inner snap ring structure on the inner wall of the accommodating passage 11.

The second limiting portion 21 is annular and is disposed on an outer wall of the transmission structure 20, and an outer diameter of the second limiting portion is smaller than an inner diameter of the accommodating channel 11, so that the transmission structure 20 is not affected when passing through the second limiting portion 21. In the present embodiment, the second limiting portion 21 is provided as a boss structure on the transmission structure 20.

It should be noted that the specific form of the first limiting portion 12 and the second limiting portion 21 is not limited to this, and in other embodiments, the first limiting portion 12 or the second limiting portion 21 may not be annular, as long as the end of the elastic member 40 can be limited.

As shown in fig. 1, in the crdm 100 according to the first embodiment, the transmission structure 20 is rod-shaped, the elastic member 40 is a spring, and the spring is sleeved on the transmission structure 20. Specifically, the transmission structure 20 is rod-shaped and moves in the accommodating channel 11, and the elastic member 40 is a spring, and two ends of the elastic member are respectively matched with the two limiting parts. The spring is sleeved on the transmission structure 20. The elastic member 40 has a simple structure and is easy to install.

In the present embodiment, there is one spring, and of course, in other embodiments, the elastic member 40 may include a plurality of springs, which are dispersedly disposed between the transmission structure 20 and the accommodating channel 11, and are respectively provided with corresponding limiting portions, so that the entire elastic member 40 has an elastic force towards the control rod 200 to the transmission structure 20.

In the crdm 100 according to the first embodiment, the crdm 100 includes two guiding portions, one of which is disposed at the first end of the transmission structure 20 and the other of which is disposed at the connecting and disconnecting device 60, and at least one of the guiding portions is located in the accommodating passage 11 and slidably engaged with the inner wall of the accommodating passage 11 when the transmission structure 20 moves while the driving structure 30 is connected to the transmission structure 20. The above arrangement ensures that the driving mechanism 20 is always guided and engaged with the receiving channel 11, thereby facilitating the movement of the driving mechanism. In addition, the advantage of setting up like this still can be according to actual need, the length of adjustment accommodation channel 11 under the prerequisite of guaranteeing the direction.

As shown in fig. 1, in the present embodiment, the first end of the transmission structure 20 is provided with a joint 22, and the control rod 200 is connected through the joint 22. To facilitate mounting between the components of the control rod drive mechanism 100, the adapter 22 is configured to be removably disposed with the transmission structure 20. When the reactor is normally started, the flexible connector 70 is connected with the connecting and disconnecting device 60, vertically moves downwards along the drive line of the control rod drive mechanism 100, is connected with the second end of the transmission structure 20, moves the transmission structure 20 up and down according to reactivity changes, controls the up and down movement of the control rod 200 through the joint 22, and finally realizes the regulation of the reactor power.

The above-mentioned joint 22 is movable within the housing channel 11, the circumferential outer wall of the joint 22 forming one of two guides. The radial dimension of the joint 22 is matched with the radial dimension of the accommodating channel 11, and the whole circumferential outer wall of the joint 22 can be in sliding fit with the inner wall of the accommodating channel 11. Of course, in other embodiments, the joint 22 may only be formed with a guide portion on a part of the outer circumferential wall, and slidably fit with the inner wall of the accommodating passage 11.

As shown in fig. 1, in the present embodiment, the connecting and disconnecting device 60 is disposed between the driving structure 30 and the transmission structure 20, and the connecting and disconnecting device 60 is capable of moving in the accommodating channel 11. The circumferentially outer wall of the linking device 60 forms the other of the two guides. The radial dimension of the connecting and disconnecting device 60 is matched with the radial dimension of the accommodating channel 11, and the whole circumferential outer wall of the connecting and disconnecting device 60 can be in sliding fit with the inner wall of the accommodating channel 11, so that the connecting and disconnecting device 60 can guide in the moving process of the transmission structure 20. Of course, in other embodiments, only a portion of the outer wall of the connecting and disconnecting device 60 may be provided as a guide portion, and slidably engaged with the inner wall of the accommodating passage 11.

It should be noted that the number and the arrangement position of the guiding portions are not limited to this, and in other embodiments not shown in the drawings, the number of the guiding portions may be three or more, and as for the arrangement position, a part of the guiding portions may be arranged on the first end of the transmission structure 20, and the rest of the guiding portions may be arranged on the connecting and disconnecting device 60 and/or the second end of the transmission structure 20. For example, guides are provided at both ends of the transmission structure 20 so that the transmission structure 20 can move along the accommodating passage 11. The housing 10 is provided with a receiving passage 11, and the receiving passage 11 may be a circular tube shape, a square tube shape, or other shapes satisfying receiving guide conditions. Furthermore, in the present embodiment, the guiding portion is directly slidably engaged with the inner wall of the accommodating channel 11, and in other embodiments, the guiding portion may be configured to engage with a guiding groove on the inner wall of the accommodating channel 11.

Fig. 2 is a schematic structural view of a crdm 100 according to a second embodiment of the present invention.

As shown in fig. 2, the control rod drive mechanism 100 of the second embodiment is mainly different from the first embodiment in that the elastic force is a tensile force, the second limiting portion 21 is located between the first limiting portion 12 and the drive structure 30, and two ends of the elastic element 40 are respectively fixedly connected to the first limiting portion 12 and the second limiting portion 21.

As shown in fig. 2, in the control rod drive mechanism 100 according to the second embodiment, the second stopper 21 is located between the first stopper 12 and the drive structure 30, and both ends of the elastic member 40 are fixedly connected to the first stopper 12 and the second stopper 21, respectively. The elastic force applied to the transmission structure 20 at this time is a tensile force in a direction toward the control rod 200. Specifically, the elastic element 40 may be a spring device, two ends of the spring device are respectively fixedly connected with the first limiting portion 12 and the second limiting portion 21, the second limiting portion 21 is located between the first limiting portion 12 and the driving structure 30, and the spring device sets a corresponding pre-stretching amount so that there is always a pulling force towards the control rod 200 on the driving structure 30. Meanwhile, in the lifting process of the control rod 200, the spring device accumulates elastic potential energy, so that the rod falling speed is accelerated when the rod falls, and the lifting and the rapid rod falling of the control rod 200 can be normally realized under the conditions of swinging and inclination.

In the second embodiment, the amount of pretension of the spring means is set to produce a tensile force greater than the sum of the weight forces of the transmission structure 20 and the control rods 200, so that the control rods 200 are not subjected to a rod ejection accident in the event of a reactor rollover. The other structures and operation principles of the second embodiment are the same as those of the first embodiment, and are not described herein again.

In the above embodiment of the present invention, the elastic member 40 is provided so that the control rod drive mechanism 100 can lift and lower the control rod 200 and drop the rod rapidly as required in the sway and tilt state. The predetermined elastic force is greater than the sum of the gravity of the control rods 200 and the transmission structure 20 so that the control rods 200 can be held in the core in an impact or upset state to prevent rod ejection accidents. The guide portion is provided to conveniently set the length of the receiving passage 11 according to the matching requirement when the control rod driving mechanism 100 is installed with the reactor. The overall design of the control rod drive mechanism 100 is simple and can satisfy the lifting control rods 200 and the rapid rod drop in the event of reactor instability.

The control rod driving mechanism 100 has the characteristics of simple structure, easy installation, convenient maintenance, good economy and the like on the basis of realizing the functions of nuclear reactor power regulation and shutdown protection, and the design of the elastic piece 40 can ensure that the control rod driving mechanism 100 can be suitable for special environmental conditions such as ocean sway, inclination, overturning and the like, thereby ensuring the safety of a reactor.

The present application also provides a reactor, according to embodiments of the reactor, comprising control rods 200 and the control rod drive mechanism 100 described above. It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.