Visual dynamic demonstration model of control rod magnetic lifting mechanism

Abstract

The utility model provides a visual dynamic demonstration model of a control rod magnetic lifting mechanism, and relates to the field of nuclear reactor equipment. Comprising a sleeve shaft arranged outside a driving shaft component in a sleeving mode, and the sleeve shaft is sequentially sleeved with a first electromagnet, a lifting armature, a movable grappling hook armature, a second electromagnet and a fixed grappling hook armature from top to bottom; the movable claw hook armature is connected with a first claw through a first connecting rod, and the first claw is matched with an annular groove in the outer wall of the driving shaft component; the fixed claw hook armature is connected with a second claw through a second connecting rod, and the second claw is matched with an annular tooth groove in the outer wall of the driving shaft component. Reset springs are arranged between the first electromagnet and the lifting armature, between the lifting armature and the movable grappling hook armature and between the second electromagnet and the fixed grappling hook armature. The structure is formed by detachably connecting a first fan-shaped part and a second fan-shaped part. The device works stably, the service life of the device is greatly prolonged, and the maintenance cost is reduced; therefore, the teaching effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of nuclear reactor equipment, and more specifically, to a visual dynamic demonstration model of a control rod magnetic lifting mechanism. Background Technology

[0002] The control rod drive mechanism is a crucial component of a nuclear reactor. It is used to deliver control rods into the reactor and drive shafts to move the control rods up and down to control the neutron flux within the reactor, thereby enabling the regulation of reactor power and emergency shutdown. The entire mechanism requires high precision in both component and assembly.

[0003] Existing control rod drive mechanisms typically use a flux loop to generate a magnetic field to move the control rod assembly. However, the energized flux loop lifting coil causes excessively high temperatures within the magnetic field, leading to model deformation and potentially affecting the entire mechanism's lifespan. Furthermore, the current control rod drive mechanisms are unsuitable for close-up demonstrations due to their specific environments, causing inconvenience for operators and researchers. In basic education, there is a lack of detailed theoretical materials and concrete, dynamic demonstration models, limiting students' understanding and mastery of control rod drive mechanisms and, to some extent, hindering their enthusiasm for research. Utility Model Content

[0004] The purpose of this invention is to provide a visual dynamic demonstration model of a control rod magnetic lifting mechanism, which can solve the problems of deformation caused by excessive internal temperature of the magnetic field due to prolonged energization of the existing magnetic flux ring lifting coil; it not only ensures the working stability of the equipment, but also greatly extends the service life of the equipment and reduces maintenance costs; at the same time, it makes the internal structure of the demonstration model visible in teaching, intuitive and easy to understand, and greatly improves the teaching effect.

[0005] The embodiments of this utility model are implemented as follows:

[0006] This application provides a visual dynamic demonstration model of a control rod magnetic lifting mechanism, including a sleeve shaft sleeved outside the drive shaft component. The sleeve shaft is provided with a first electromagnet, a lifting armature, a movable grab hook armature, a second electromagnet, and a fixed grab hook armature in sequence from top to bottom.

[0007] The movable grab hook armature is connected to a first hook claw via a first connecting rod. The first hook claw passes through the sleeve shaft and engages with the annular groove on the outer wall of the drive shaft component. The fixed grab hook armature is connected to a second hook claw via a second connecting rod. The second hook claw passes through the sleeve shaft and engages with the annular toothed groove on the outer wall of the drive shaft component.

[0008] A return spring is provided between the first electromagnet and the lifting armature, between the lifting armature and the movable grab hook armature, and between the second electromagnet and the fixed grab hook armature.

[0009] The first electromagnet, the lifting armature, the movable grab hook armature, the second electromagnet, and the fixed grab hook armature are all composed of two fan-shaped structures that can be detachably connected.

[0010] Furthermore, based on the aforementioned scheme, the two fan-shaped structures have different cross-sectional areas, and the fan-shaped structure with the smaller cross-sectional area is made of transparent material.

[0011] Furthermore, based on the aforementioned scheme, a strip-shaped hole is provided on one side of the sleeve shaft, and the opening arc length of the strip-shaped hole is consistent with the inner arc length of the first sector portion; the claw portions of the first hook and the second hook pass through the strip-shaped hole and engage with the drive shaft component.

[0012] Furthermore, based on the aforementioned scheme, the bottom of the movable grab hook armature is provided with a first annular inner cavity, and the first annular inner cavity is provided with a first iron ring; one end of the first connecting rod is connected to the movable grab hook armature through a pin, and the other end of the first connecting rod is connected to the first hook claw and the first iron ring through a pin;

[0013] The fixed grab hook armature has a second annular inner cavity at its bottom, and the second annular inner cavity has a second iron ring; one end of the second connecting rod is connected to the fixed grab hook armature by a pin, and the other end of the second connecting rod is connected to the second claw and the second iron ring by a pin.

[0014] Furthermore, based on the aforementioned scheme, a return spring is also provided between the top of the second iron ring and the inner cavity of the second annular ring.

[0015] Furthermore, based on the aforementioned scheme, the top of the lifting armature is provided with a first annular groove for the reset spring to be embedded; the bottom outer wall of the lifting armature is provided with a second annular groove for the reset spring to be embedded; and the top of the movable grab hook armature is provided with a third annular groove for the reset spring to be embedded.

[0016] Furthermore, based on the aforementioned scheme, the first annular inner cavity is also provided with a connecting ring, which is connected to the bottom of the lifting armature.

[0017] Furthermore, based on the aforementioned scheme, the second electromagnet is provided with a support ring at its bottom, and the bottom of the support ring and the top of the fixed hook armature are respectively provided with a fourth annular groove and a fifth annular groove for the reset spring to be embedded.

[0018] Furthermore, based on the aforementioned scheme, an end retaining ring is fixedly connected to the bottom outer side of the sleeve shaft.

[0019] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:

[0020] This application arranges a first electromagnet, a lifting armature, a movable hook armature, a second electromagnet, and a fixed hook armature sequentially from top to bottom outside the sleeve shaft. When the electromagnets are energized, they generate magnetic force to drive the lifting armature, movable hook armature, and fixed hook armature upwards, respectively. The first pawl connected to the movable hook armature and the second pawl connected to the fixed hook armature engage with the drive shaft component, so that when the first and second pawls move upwards synchronously, they drive the drive shaft component upwards. By controlling the upward movement of the drive shaft component using electromagnets, the magnitude of the magnetic force can be controlled by energizing the electromagnets, thereby controlling the stepwise movement of the first and second pawls on the drive shaft component, effectively controlling the rod assembly. The precise movement and fixation of the control rod assembly meet the requirements for movement of the nuclear reactor control rod assembly. By installing return springs between the first electromagnet and the lifting armature, between the lifting armature and the moving hook armature, and between the second electromagnet and the fixed hook armature, the control rod assembly can automatically move downwards and insert into the nuclear reactor under the elastic recovery action and its own gravity when the electromagnet is de-energized. By detachably connecting two sector-shaped structures for each of the first electromagnet, lifting armature, moving hook armature, second electromagnet, and fixed hook armature, the internal structure of each structure can be dissected, exposing the internal structure. This makes the internal structure of the demonstration model visually clear and easy to understand, greatly improving teaching effectiveness. Students can clearly observe the internal operation of the model, which helps them understand the relevant principles. This application solves the problems of model deformation caused by excessively high internal magnetic field temperature due to prolonged energization of existing flux loop lifting coils; it not only ensures the working stability of the equipment but also greatly extends its service life and reduces maintenance costs. Simultaneously, it makes the internal structure of the demonstration model visually clear and easy to understand, greatly improving teaching effectiveness. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the longitudinal structure of the control rod magnetic lifting mechanism in a visual dynamic demonstration model according to an embodiment of this utility model.

[0023] Figure 2 This is a top view of the overall structure of the control rod magnetic lifting mechanism visualization dynamic demonstration model according to an embodiment of this utility model;

[0024] Figure 3 This is an enlarged schematic diagram of the structure of the movable grab hook armature in an embodiment of this utility model;

[0025] Figure 4 This is an enlarged schematic diagram of the structure of the fixed grab hook armature in an embodiment of this utility model.

[0026] Icons: 1-Drive shaft component, 11-Annular toothed groove, 2-Sleeve shaft, 21-Strip hole, 22-End fixing ring, 3-First electromagnet, 31-First sector, 32-Second sector, 4-Lifting armature, 41-First annular groove, 42-Second annular groove, 5-Moving grab hook armature, 51-First connecting rod, 52-First claw, 53-First annular cavity, 54-First iron ring, 55-Third annular groove, 56-Connecting ring, 6-Second electromagnet, 61-Support ring, 62-Fourth annular groove, 7-Fixed grab hook armature, 71-Second connecting rod, 72-Second claw, 73-Second annular cavity, 74-Second iron ring, 75-Fifth annular groove, 8-Reset spring. Detailed Implementation

[0027] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0028] Please refer to Figures 1-4 The image shown is a schematic diagram of the overall structure of a visual dynamic demonstration model of the control rod magnetic lifting mechanism.

[0029] This embodiment provides a visual dynamic demonstration model of a control rod magnetic lifting mechanism, including a sleeve shaft 2 sleeved outside the drive shaft component 1. From top to bottom, the sleeve shaft 2 is fitted with a first electromagnet 3, a lifting armature 4, a movable grab hook armature 5, a second electromagnet 6, and a fixed grab hook armature 7.

[0030] The movable grab hook armature 5 is connected to the first hook 52 via the first connecting rod 51. The first hook 52 passes through the sleeve shaft 2 and matches the annular groove on the outer wall of the drive shaft component 1. The fixed grab hook armature 7 is connected to the second hook 72 via the second connecting rod 71. The second hook 72 passes through the sleeve shaft 2 and matches the annular toothed groove 11 on the outer wall of the drive shaft component 1.

[0031] A return spring 8 is provided between the first electromagnet 3 and the lifting armature 4, between the lifting armature 4 and the movable grab hook armature 5, and between the second electromagnet 6 and the fixed grab hook armature 7.

[0032] The first electromagnet 3, the lifting armature 4, the movable grab hook armature 5, the second electromagnet 6, and the fixed grab hook armature 7 are all composed of two fan-shaped structures that can be detachably connected.

[0033] The following will further explain a visual dynamic demonstration model of a control rod magnetic lifting mechanism according to this exemplary embodiment.

[0034] In some implementations, refer to Figure 1 The aforementioned sleeve shaft 2 provides axial movement space for the internal drive shaft component 1. The aforementioned drive shaft component 1 is an external drive shaft with a control rod inside, i.e., a control rod assembly. The external drive shaft has several annular grooves spaced apart along its axial direction. The sleeve shaft 2 is fitted with a first electromagnet 3, a lifting armature 4, a movable hook armature 5, a second electromagnet 6, and a fixed hook armature 7 sequentially from top to bottom. When the first electromagnet 3 and the second electromagnet 6 are energized, they generate magnetic force to attract the lifting armature 4, the movable hook armature 5, and the fixed hook armature 7 below, driving them to move upward. When the electromagnetic force is deactivated, it disappears.

[0035] It should be noted that the first electromagnet 3 and the second electromagnet 6 mentioned above only have magnetic attraction at the end facing the bottom. In the case of a closed magnetic circuit design in the prior art (such as an electromagnet with a yoke), if the electromagnet is designed with a yoke (a closed path formed by magnetic conductive material), the magnetic field will form a loop through the yoke, reducing leakage magnetic field on the "back side". In this case, the attraction on the back side may be almost zero because the magnetic field is guided to a specific working end.

[0036] Reference Figure 3 and Figure 4 The aforementioned movable grab armature 5 is connected to a first claw 52 via a first connecting rod 51. The first claw 52 passes through the sleeve shaft 2 and engages with the annular groove on the outer wall of the drive shaft component 1. The fixed grab armature 7 is connected to a second claw 72 via a second connecting rod 71. The second claw 72 passes through the sleeve shaft 2 and engages with the annular toothed groove 11 on the outer wall of the drive shaft component 1. The first claw 52 and the second claw 72 move upward synchronously with the movable grab armature 5 and the fixed grab armature 7, respectively. During the upward movement, the first claw 52 and the second claw 72 alternately engage with the annular groove of the drive shaft component 1, thereby driving the drive shaft to move upward. The aforementioned electromagnet is powered by DC and is controlled by switching on and off according to the design program. By controlling the current flowing through the electromagnet, the magnetic force can be controlled, thereby enabling the first claw 52 and the second claw 72 to move step by step along the drive shaft component 1. This can be adjusted according to the movement requirements, effectively achieving precise movement and fixation of the control rod assembly, and meeting the movement requirements of the nuclear reactor control rod assembly.

[0037] In some embodiments, a return spring 8 is provided between the first electromagnet 3 and the lifting armature 4, between the lifting armature 4 and the movable grab hook armature 5, and between the second electromagnet 6 and the fixed grab hook armature 7. By providing the return spring 8, when the electromagnet is de-energized, the above structure can move down to its original position under the elastic recovery action of the return spring 8, thereby causing the first hook 52 and the second hook 72 to drive the drive shaft component 1 to move down. Since the first hook 52 and the second hook 72 are movably connected by connecting rods, they will not obstruct the downward movement of the drive shaft component 1, allowing the drive shaft component 1 to continue to move down under its own gravity and automatically insert into the core by gravity to achieve fixation.

[0038] In some implementations, refer to Figure 1 and Figure 2 The aforementioned first electromagnet 3, lifting armature 4, movable grab hook armature 5, second electromagnet 6, and fixed grab hook armature 7 are all composed of two detachably connected sector-shaped structures. Through this structural design, during teaching demonstrations, one of the sector-shaped structures can be disassembled to expose its internal structure for demonstration purposes. This makes the internal structure of the demonstration model visible, intuitive, and easy to understand, greatly improving teaching effectiveness. Students can clearly observe the internal operation of the model, which helps them understand the relevant principles. Figure 2 The first electromagnet 3 is composed of a first sector 31 and a second sector 32 connected together.

[0039] As a preferred implementation, the two sector-shaped structures have different cross-sectional areas, with the smaller sector-shaped structure made of a transparent material. The area of ​​one sector-shaped structure is designed to be smaller than that of the other, allowing for easier disassembly of the smaller structure while facilitating the fixation of the larger structure on the overall mechanism. Alternatively, the smaller sector-shaped structure can be designed to be transparent, allowing observation of the internal structure without disassembly, thus facilitating teaching.

[0040] In a preferred embodiment, a strip-shaped hole 21 is provided on one side of the sleeve shaft 2, and the arc length of the opening of the strip-shaped hole 21 is consistent with the arc length of the inner circle of the first sector portion 31; the claw portions of the first claw 52 and the second claw 72 pass through the strip-shaped hole 21 and engage with the drive shaft component 1. Providing a strip-shaped hole 21 on one side of the sleeve shaft 2 facilitates the engagement of the first claw 52 and the second claw 72 with the drive shaft, and also facilitates observation of the internal drive shaft component 1, thus improving teaching effectiveness.

[0041] In a preferred embodiment, the bottom of the movable grab hook armature 5 is provided with a first annular inner cavity 53, and the first annular inner cavity 53 is provided with a first iron ring 54; one end of the first connecting rod 51 is connected to the movable grab hook armature 5 by a pin, and the other end of the first connecting rod 51 is connected to the first hook 52 and the first iron ring 54 by a pin; the bottom of the fixed grab hook armature 7 is provided with a second annular inner cavity 73, and the second annular inner cavity 73 is provided with a second iron ring 74; one end of the second connecting rod 71 is connected to the fixed grab hook armature 7 by a pin, and the other end of the second connecting rod 71 is connected to the second hook 72 and the second iron ring 74 by a pin. By setting a first iron ring 54 and a second iron ring 74, and movably setting the first hook 52 and the second hook 72 on the first iron ring 54 and the second iron ring 74 respectively, when the electromagnet is energized and generates magnetic attraction, it can simultaneously attract the first iron ring 54 and the second iron ring 74, thereby driving the first hook 52 and the second hook 72 to move synchronously, so as to avoid the first hook 52 and the second hook 72 from rotating relative to the corresponding armature, which would prevent them from moving axially.

[0042] In a preferred embodiment, a return spring 8 is also provided between the top of the second iron ring 74 and the second annular inner cavity 73 to assist the second hook 72 in resetting.

[0043] In a preferred embodiment, the top of the lifting armature 4 is provided with a first annular groove 41 for the reset spring 8 to be embedded; the bottom outer wall of the lifting armature 4 is provided with a second annular groove 42 for the reset spring 8 to be embedded; and the top of the movable hook armature 5 is provided with a third annular groove 55 for the reset spring 8 to be embedded. Through the design of these multiple annular grooves, the reset spring 8 can be stably connected to the above structure for elastic expansion and contraction.

[0044] As a preferred embodiment, the first annular inner cavity 53 is further provided with a connecting ring 56, which is connected to the bottom of the lifting armature 4, connecting the lifting armature 4 and the movable grab hook armature 5 into one unit, and moving synchronously under the action of magnetic attraction.

[0045] In a preferred embodiment, the second electromagnet 6 is provided with a support ring 61 at its bottom. The bottom of the support ring 61 and the top of the fixed hook armature 7 are respectively provided with a fourth annular groove 62 and a fifth annular groove 75 for the reset spring 8 to be embedded, which serve to support and fix the reset spring 8 and limit its movement.

[0046] In a preferred embodiment, an end fixing ring 22 is fixedly connected to the bottom outer side of the sleeve shaft 2 to fix the sleeve shaft 2 and prevent it from moving.

[0047] The beneficial effects of the embodiments of this application are as follows:

[0048] This application optimizes the drive shaft lifting mechanism by replacing the traditional flux loop with a custom electromagnet. The application of the custom electromagnet effectively solves problems such as model deformation caused by excessively high internal magnetic field temperatures due to prolonged energization of the flux loop lifting coil. This improvement not only ensures the stability of the equipment's operation but also significantly extends its service life and reduces maintenance costs.

[0049] This application presents an innovative design for the reset mechanism of the movable grab hook armature 5. Compared to the traditional textbook example model structure, the movable grab hook coil is eliminated, and the grab hook connecting rod is redesigned. This design utilizes the cooperation of gravity and the armature reset spring 8 to achieve the descent of the lifting armature 4 relative to the drive shaft. This change simplifies the mechanism, reduces manufacturing costs, and improves the reliability of the mechanism.

[0050] This application employs a three-section design for the ring-shaped structure, one section of which can be removed or replaced with a transparent material. This design makes the internal structure of the demonstration model visible during teaching, intuitive and easy to understand, greatly improving teaching effectiveness. Students can clearly observe the internal operation of the model, which helps them understand the relevant principles.

[0051] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0052] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A visual dynamic demonstration model of a control rod magnetic lifting mechanism, characterized in that, Includes a sleeve shaft fitted outside the drive shaft component, and the sleeve shaft is fitted with a first electromagnet, a lifting armature, a movable grab hook armature, a second electromagnet and a fixed grab hook armature in sequence from top to bottom; The movable grab hook armature is connected to a first hook claw via a first connecting rod. The first hook claw passes through the sleeve shaft and engages with the annular groove on the outer wall of the drive shaft component. The fixed grab hook armature is connected to a second hook claw via a second connecting rod. The second hook claw passes through the sleeve shaft and engages with the annular toothed groove on the outer wall of the drive shaft component. A return spring is provided between the first electromagnet and the lifting armature, between the lifting armature and the movable grab hook armature, and between the second electromagnet and the fixed grab hook armature. The first electromagnet, the lifting armature, the movable grab hook armature, the second electromagnet, and the fixed grab hook armature are all composed of two fan-shaped structures that can be detachably connected.

2. The visual dynamic demonstration model of the control rod magnetic lifting mechanism according to claim 1, characterized in that, The two sector-shaped structures have different cross-sectional areas, and the sector-shaped structure with the smaller cross-sectional area is made of transparent material; the first electromagnet is composed of a first sector-shaped part and a second sector-shaped part connected together.

3. The visual dynamic demonstration model of the control rod magnetic lifting mechanism according to claim 2, characterized in that, A strip-shaped hole is provided on one side of the sleeve shaft, and the opening arc length of the strip-shaped hole is consistent with the inner arc length of the first sector portion; the claw portions of the first hook and the second hook pass through the strip-shaped hole and engage with the drive shaft component.

4. The visual dynamic demonstration model of the control rod magnetic lifting mechanism according to claim 1, characterized in that, The bottom of the movable grab hook armature is provided with a first annular inner cavity, and the first annular inner cavity is provided with a first iron ring; one end of the first connecting rod is connected to the movable grab hook armature by a pin, and the other end of the first connecting rod is connected to the first hook and the first iron ring by a pin. The fixed grab hook armature has a second annular inner cavity at its bottom, and the second annular inner cavity has a second iron ring; one end of the second connecting rod is connected to the fixed grab hook armature by a pin, and the other end of the second connecting rod is connected to the second claw and the second iron ring by a pin.

5. The visual dynamic demonstration model of the control rod magnetic lifting mechanism according to claim 4, characterized in that, A return spring is also provided between the top of the second iron ring and the inner cavity of the second annular ring.

6. The visual dynamic demonstration model of the control rod magnetic lifting mechanism according to claim 4, characterized in that, The top of the lifting armature has a first annular groove for the reset spring to be inserted; the bottom outer wall of the lifting armature has a second annular groove for the reset spring to be inserted; and the top of the movable grab hook armature has a third annular groove for the reset spring to be inserted.

7. The visual dynamic demonstration model of the control rod magnetic lifting mechanism according to claim 6, characterized in that, The first annular inner cavity is also provided with a connecting ring, which is connected to the bottom of the lifting armature.

8. The visual dynamic demonstration model of the control rod magnetic lifting mechanism according to claim 1, characterized in that, The second electromagnet has a support ring at its bottom, and the bottom of the support ring and the top of the fixed hook armature are respectively provided with a fourth annular groove and a fifth annular groove for the reset spring to be embedded.

9. The visual dynamic demonstration model of the control rod magnetic lifting mechanism according to claim 1, characterized in that, An end retaining ring is fixedly connected to the bottom outer side of the sleeve shaft.

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