Control rod driving mechanism and redundant system

Abstract

The invention relates to the technical field of high-temperature gas cooled reactor control, in particular to a control rod driving mechanism and a redundant system.The control rod driving mechanism comprises a driving assembly which comprises a motor, a fixing plate arranged at the output end of the motor, a lead screw arranged on the outer wall of the fixing plate and a rope winder movably arranged on the outer wall of the lead screw; the movement assembly comprises a rope connected with the rope winder and a control rod arranged at one end part of the rope; the sliding rod is arranged, the rope winding device can do axial movement along the sliding rod, the rope winding device is matched with the lead screw and the nut, rotation and axial transmission of the rope winding device in the movement direction are achieved, it is guaranteed that a rope is always connected with a control rod channel to achieve straight-up and straight-down movement, and two sets of driving mechanisms with different principles, namely a mechanical system and an electrical system are adopted; and when one set of system breaks down, the other set of system can be seamlessly taken over, so that the system shutdown caused by a single-point fault is avoided, and the continuity and stability of a measurement task are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of high temperature gas-cooled reactor control, in particular to a control rod driving mechanism and a redundant system. Background Art

[0002] As a clean and efficient energy source, nuclear energy plays an important role in the global energy structure. The safety and stability of nuclear power plants are key factors in their development, and the control rod system, as the core component of nuclear reactors, is responsible for regulating and controlling the rate of nuclear fission reactions to ensure the safe operation of the reactor. In high-temperature gas-cooled reactors, the performance of the control rod drive mechanism directly affects the control accuracy and safety of the reactor.

[0003] The existing control rod drive mechanism of high temperature gas-cooled reactor mainly adopts ring chain or wire rope drive. These systems have shown certain limitations in practical applications, especially in the face of emergency situations, such as the problem of control rod sticking caused by power failure, which may cause the reactor to fail to shut down in time, increasing safety risks. In addition, the complexity of the existing system and the excessive number of mechanical components also increase the difficulty of maintenance and potential failure points, affecting the reliability and efficiency of the system.

[0004] Based on the above problems, we proposed a control rod drive mechanism and redundant system. Summary of the invention

[0005] In view of the above-mentioned technical problem of the existing emergency shutdown power-off rod jamming, a control rod driving mechanism in the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a control rod driving mechanism, which includes a driving assembly, including a motor, a fixed plate arranged at the output end of the motor, a screw rod arranged on the outer wall of the fixed plate, and a rope winder movably arranged on the outer wall of the screw rod; a moving assembly, which includes a rope connected to the rope winder and a control rod arranged at one end of the rope; the rope winder controls the release or winding of the rope by moving and rotating, so as to control the axial movement of the control rod.

[0007] As a preferred solution of the control rod driving mechanism of the present invention, one end of the rope is fixed to the outer wall of the rope winder, and the other end is fixed to the center of the top of the control rod.

[0008] As a preferred solution of the control rod driving mechanism of the present invention, a friction disk is provided on the outer wall of one end of the motor, a rotating drum is provided on the outer wall of the motor, and a base is provided on the outer wall of the rotating drum.

[0009] As a preferred solution of the control rod driving mechanism of the present invention, three sliding rods are arranged on the outer wall of the fixing plate, and the three sliding rods pass through the rope winder.

[0010] As a preferred solution of the control rod driving mechanism of the present invention, the lead screw passes through the rope winder, and a nut matching the lead screw is provided inside the rope winder.

[0011] As a preferred solution of the control rod driving mechanism of the present invention, the three sliding rods are evenly distributed on the outer wall of the fixed plate to form a stable triangular structure.

[0012] As a preferred solution of the control rod driving mechanism of the present invention, the outer walls of the three sliding rods are sleeved with a first stop ring and a second stop ring.

[0013] As a preferred solution of the control rod driving mechanism of the present invention, the rope winder is movably arranged between the first stop ring and the second stop ring.

[0014] One beneficial effect of the present invention is that by setting a sliding rod, the rope winder can move axially along the sliding rod, and in conjunction with the lead screw and the nut, the rope winder can rotate in the direction of movement and transmit axially, ensuring that the rope is always connected to the control rod channel to achieve straight up and down movement.

[0015] In view of the above-mentioned technical problems that the existing system is complex and too many mechanical components reduce reliability and efficiency, a control rod drive mechanism redundant system in the present invention is proposed.

[0016] In order to solve the above technical problems, the present invention provides the following technical solutions: a control unit, including a displacement sensor and a controller; the displacement sensor transmits information to the controller by sensing a control rod action signal.

[0017] As a preferred solution of the control rod drive mechanism redundancy system of the present invention, the controller includes a controller drive module A and a controller drive module B, and the controller drive module A and the controller drive module B can be switched through timed switching reminders or manually switched.

[0018] Another beneficial effect of the present invention is that by adopting two sets of driving mechanisms with different principles, namely mechanical and electrical systems, it is ensured that when one system fails, the other can take over seamlessly, thereby avoiding system shutdown caused by single point failure, ensuring the continuity and stability of the measurement task, and the mutual verification mechanism of the two systems helps to reduce system errors and further improve the accuracy of the measurement. The logic optimization and rapid response capability of the controller enable the system to flexibly adapt to different working conditions and measurement requirements, and realize precise control of the motor operation and accurate measurement of the rope drop distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structural connection of the control rod drive mechanism in the present invention.

[0021] Figure 2 It is an exploded view of the control rod drive mechanism in the present invention.

[0022] Figure 3 This is a control flow chart of the redundant system in the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0026] Example 1, reference Figure 1-2 , which is the first embodiment of the present invention, provides a control rod drive mechanism, including a driving assembly 100 and a moving assembly 200. By setting a rope winder 104 to cooperate with the rope 201 to wind or release, the control rod 202 can achieve axial movement up and down in the reactor core.

[0027] Specifically, the driving assembly 100 includes a motor 101, a fixed plate 102 arranged at the output end of the motor 101, a screw rod 103 arranged on the outer wall of the fixed plate 102, and a rope winder 104 movably arranged on the outer wall of the screw rod 103; the moving assembly 200 includes a rope 201 connected to the rope winder 104 and a control rod 202 arranged at one end of the rope 201; the rope winder 104 can control the axial movement of the control rod 202 by moving and rotating to control the release or winding of the rope 201.

[0028] Preferably, one end of the rope 201 is fixed to the outer wall of the rope winder 104 , and the other end is fixed to the center of the top of the control rod 202 .

[0029] Among them, the displacement distance of rope 201 is calculated as:

[0030] L=√[(πD)^2+s^2]*H / s.

[0031] In the formula, L is the distance the rope end moves, D is the diameter of the rope winder, s is the lead of the spiral groove on the rope winder, and H is the length of the spiral groove of the rope winder.

[0032] Preferably, a friction disc 101a is provided on the outer wall of one end of the motor 101, a rotating drum 101b is provided on the outer wall of the motor 101, and a base 101c is provided on the outer wall of the rotating drum 101b.

[0033] Among them, the motor 101 is used to provide a power source to drive the movement of the entire control rod drive mechanism; the base 101c is used to support the entire control rod drive mechanism, and the drum 101b is movably arranged in the base 101c; the outer wall of the drum 101b is provided with a protrusion, and the outer wall of the motor 101 is provided with a groove, and the motor 101 is connected to the drum 101b through the cooperation of the groove and the protrusion; a friction disk 101a is provided at the tail of the motor 101, and a fixing plate 102 is provided at the output end; the design of the friction disk 101a can reduce the risk of the control rod 202 being unable to move due to a failure of the motor 101, and improve the reliability of the entire system; the friction disk 101a is driven by an electromagnet, that is, in the event of an accident power failure, the drive mechanism loses power, and the kinetic energy of the free fall motion of the control rod 202 can be converted into Electric energy activation can still ensure that the driving mechanism can quickly drop the rod and meet the time response requirements, reducing the impact on the components inside the reactor; one end of the screw rod 103 is fixedly connected to the outer wall of the fixed plate 102, and the other end passes through the first stop ring 102b, the rope winder 104 and the second stop ring 102c; the rope winder 104 is a cylindrical structure, one end of the rope 201 is fixedly connected to the outer wall of the rope winder 104 and wound around the outer wall of the rope winder 104, and the other end is perpendicular to the rope winder 104 and downwardly connected to the top center position of the control rod 202, and is on the same axis as the axis of the control rod 202; the rope 201 can convert the rotational motion of the motor 101 and the rope winder 104 into the linear motion of the control rod 202, ensuring that the control rod 202 can be inserted into or pulled out of the reactor core as needed.

[0034] In summary, by starting the motor 101, the fixed plate 102 can drive the lead screw 103 to rotate, and at this time the rope winder 104 rotates. The position of the control rod 202 in the core can be adjusted by controlling the winding and release of the rope 201. The rope 201 can provide a certain tension. The section where the rope 201 and the rope winder 104 end to be wound and the section where the rope 201 and the control rod 202 are connected are always on the same axis as the axis of the control rod 202, ensuring that the control rod 202 remains stable in the core and will not be displaced due to the fluid dynamics or other external forces in the reactor.

[0035] Example 2, reference Figure 1-2 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but the difference is that the arrangement of the three slide bars 102a can enable the rope winder 104 to move horizontally to ensure that when the rope 201 is wound or released, the horizontal position of the control rod 202 remains unchanged, and the movement is always straight up and down.

[0036] Specifically, three sliding rods 102 a are provided on the outer wall of the fixing plate 102 , and the three sliding rods 102 a penetrate the rope winder 104 .

[0037] Preferably, the screw rod 103 passes through the rope winder 104 , and a nut 104 a matching the screw rod 103 is provided inside the rope winder 104 .

[0038] Preferably, the three sliding rods 102a are evenly distributed on the outer wall of the fixing plate 102 to form a stable triangular structure.

[0039] Preferably, the outer walls of the three sliding rods 102a are sleeved with a first stop ring 102b and a second stop ring 102c.

[0040] Preferably, the rope winder 104 is movably disposed between the first stop ring 102b and the second stop ring 102c.

[0041] Among them, one end of the three sliding rods 102a is fixedly connected to the fixed plate 102, and the other end is fixedly connected to the second stop ring 102c; a channel for the screw rod 103 to pass through is opened at the center of the rope winder 104, and a nut 104a is arranged in the channel. The screw rod 103 rotates and cooperates with the nut 104a to make the rope winder 104 move horizontally; the three sliding rods 102a pass through the rope winder 104 to provide a guide for the horizontal movement of the rope winder 104, and the outer wall of the rope winder 104 is penetrated by a through hole matching the three sliding rods 102a; the three evenly distributed sliding rods 102a can distribute the load more evenly, reduce the stress on a single sliding rod, and thus improve the durability of the entire system. and reliability; the stable triangular structure helps to improve the seismic performance of the entire system and ensure that the control rod drive mechanism can still work normally under other vibration conditions; the first stop ring 102b and the second stop ring 102c are both provided with through holes for the screw rod 103 to pass through at the center of the circle; the three sliding rods 102a successively pass through the first stop ring 102b, the rope winder 104 and the second stop ring 102c, and the setting of the first stop ring 102b and the second stop ring 102c limits the horizontal movement range of the rope winder 104, and also limits the movement range of the control rod 202, preventing it from being excessively inserted or withdrawn, protecting the control rod and the core from damage, and ensuring the safe operation of the reactor.

[0042] In summary, when the motor 101 is started, the fixed plate 102 rotates and the lead screw 103b rotates, so that the three slide bars 102a rotate synchronously, and at the same time the rope winder 104 rotates, winds or releases the rope 201, and converts the rotational motion of the rope winder 104 into the linear motion of the control rod 202. At this time, the lead screw 103b and the nut 104a are movably matched, so that the rope winder 104 moves horizontally along the three slide bars 102a while rotating, so as to ensure that the horizontal position of the control rod 202 remains unchanged when the rope 201 is wound or released, so that the rope winder 104 can rotate in the direction of movement and transmit along the axial direction, so as to ensure that the rope 201 always carries the control rod 202 to realize straight up and down motion along the control rod channel, thereby solving the jamming problem in the prior art.

[0043] Example 3, reference Figure 1 to Figure 3 , which is the third embodiment of the present invention. This embodiment is based on the previous embodiment, but differs in that a redundant system is set up to ensure continuous operation of the measurement system and avoid system shutdown caused by a single point failure.

[0044] Specifically, the control unit 300 includes a displacement sensor 301 and a controller 302 ; the displacement sensor 301 transmits information to the controller 302 by sensing the control rod action signal.

[0045] Preferably, the controller 302 includes a controller driving module A302a and a controller driving module B302b. The controller driving module A302a and the controller driving module B302b can be switched between each other through a timed switching reminder or manually switched.

[0046] Among them, the control rod action signal is the input signal of the system, which comes from the operator's operation instruction or the trigger signal of the automation system; the displacement sensor 301 is used to detect the position change of the control rod 202, convert the mechanical displacement into an electrical signal, and feed it back to the controller 302; the controller 302 receives the signal of the displacement sensor 301, and decides how to adjust the state of the system according to the preset control logic and algorithm; the controller 302 performs specific control actions through the controller drive module A302a and the controller drive module B302b according to the control strategy; the controller drive module A302a and the controller drive module B302b can remind or switch the control strategy at a specific time point to adapt to different operation requirements, and allow the operator to manually intervene in the system when necessary, switch the control mode or directly control the drive module.

[0047] In summary, the control rod action signal triggers the displacement sensor 301, and the displacement sensor 301 transmits the position change information to the controller 302. The controller 302 performs corresponding control actions through the controller driving module A302a and the controller driving module B302b according to the received information and the preset control strategy. The timed conversion reminder and manual switching provide additional control flexibility to adapt to different operating conditions and requirements, and can ensure the measurement accuracy of the control rod 202.

[0048] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0049] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0050] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A control rod drive mechanism, characterized in that: include, A driving assembly (100) comprises a motor (101), a fixing plate (102) arranged at the output end of the motor (101), a screw rod (103) arranged on the outer wall of the fixing plate (102), and a rope winder (104) movably arranged on the outer wall of the screw rod (103); A motion assembly (200), comprising a rope (201) connected to the rope winder (104) and a control rod (202) disposed at one end of the rope (201); The rope winder (104) controls the release or winding of the rope (201) by moving and rotating, thereby controlling the axial movement of the control rod (202).

2. The control rod drive mechanism according to claim 1, characterized in that: One end of the rope (201) is fixedly arranged on the outer wall of the rope winder (104), and the other end is fixedly arranged at the center of the top of the control rod (202).

3. The control rod drive mechanism according to claim 2, characterized in that: A friction disc (101a) is provided on the outer wall of one end of the motor (101), a rotating drum (101b) is provided on the outer wall of the motor (101), and a base (101c) is provided on the outer wall of the rotating drum (101b).

4. The control rod drive mechanism according to claim 3, characterized in that: The outer wall of the fixing plate (102) is provided with three sliding rods (102a), and the three sliding rods (102a) pass through the rope winder (104).

5. The control rod drive mechanism according to claim 4, characterized in that: The screw rod (103) passes through the rope winder (104), and a nut (104a) matching the screw rod (103) is provided inside the rope winder (104).

6. The control rod drive mechanism according to claim 5, characterized in that: The three sliding rods (102a) are evenly distributed on the outer wall of the fixing plate (102) to form a stable triangular structure.

7. The control rod drive mechanism according to claim 6, characterized in that: The outer walls of the three sliding rods (102a) are sleeved with a first stop ring (102b) and a second stop ring (102c).

8. The control rod drive mechanism according to claim 7, characterized in that: The rope winder (104) is movably arranged between the first stop ring (102b) and the second stop ring (102c).

9. A control rod drive mechanism redundant system, characterized in that: Comprising a control rod drive mechanism as claimed in any one of claims 1 to 8; as well as A control unit (300) comprising a displacement sensor (301) and a controller (302); The displacement sensor (301) transmits information to the controller (302) by sensing the control rod action signal.

10. The control rod drive mechanism redundancy system according to claim 9, characterized in that: The controller (302) comprises a controller driving module A (302a) and a controller driving module B (302b). The controller driving module A (302a) and the controller driving module B (302b) can be switched between each other through a timed switching reminder or manually switched.

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