Electromagnetic coil for control rod driving mechanism of nuclear power plant

Abstract

The utility model discloses an electromagnetic coil for a control rod driving mechanism of a nuclear power plant, which comprises a ceramic coil framework, an insulating strip assembly and a winding wire, and the electromagnetic coil for the control rod driving mechanism of the nuclear power plant can increase the overall strength of the ceramic coil framework through the arrangement of the insulating strip assembly. The overall insulation performance of the ceramic coil framework can be improved, even if the ceramic coil framework cracks under the conditions of vibration, collision and the like, the structural form of the ceramic coil framework can still be prevented from collapsing and falling off, stable insulation performance of the ceramic coil framework is guaranteed, the reliability of the ceramic coil framework is improved, and the service life of the ceramic coil framework is prolonged. The insulation strip assembly provides a buffering effect between the framework inner cylinder and the winding wire and between the ceramic coil framework and other parts, and the collision and extrusion cracking risk of the ceramic coil framework can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high temperature resistant control rod driving mechanisms of pressurized water type nuclear power plants, in particular to an electromagnetic coil for a control rod driving mechanism of a nuclear power plant. Background Art

[0002] The control rod drive mechanism is a servo mechanism for the control system and safety protection system of a nuclear power plant. Its specific function is to lift, lower, hold or quickly insert the control rod to complete the reactor startup, adjust the reactor power, maintain power, stop the reactor and quickly stop thrust in the event of an accident. It is one of the key equipment that directly affects the normal operation and safety and reliability of a nuclear reactor. After the coil components of the pressurized water reactor control rod drive mechanism are energized, electromagnetic force is used as the driving force, and the electromagnetic force drives the control rod assembly to achieve the purpose of controlling the reactor power.

[0003] When the ventilation and cooling device of the control rod drive mechanism fails and there is no ventilation and cooling, the operating temperature of the electromagnetic coil will reach above 300°C. The organic materials of the existing coil components will quickly begin to decompose under high temperature conditions above 300°C, which can easily cause the coil to loosen and be damaged, thereby affecting the safe operation of the reactor and nuclear power plant. The high-temperature resistant control rod drive mechanism is the future development direction in the field of drive mechanisms. By improving the high-temperature resistance of the coil components, the safety and reliability of the drive mechanism operation can be improved. At the same time, the cooling fan of the drive mechanism and the ventilation and cooling system of the drive mechanism can be eliminated, which can simplify the top structure, reduce the weight of the top, improve the earthquake resistance of the reactor, improve the safety and reliability of the entire reactor operation, and reduce the cost of reactor construction and maintenance.

[0004] For the high temperature resistant coil of the control rod drive mechanism, relevant ceramic coil skeleton technology has been adopted at home and abroad. The main technical features include: winding the winding wire coated with ceramic paint to form a coil, installing the coil into a coil shell of a ceramic skeleton, using a potting material to encapsulate the coil in the coil shell, and baking and curing the potting material.

[0005] The characteristics of ceramic materials are that they are easily brittle and microcracks are easily generated inside the ceramic skeleton during manufacturing. Under the long-term cold and hot cycle conditions and vibration conditions of the coil, the microcracks in the ceramic coil skeleton may expand and cause the coil shell to crack, the skeleton structure to collapse, the insulation performance to decrease, and the coil to be damaged. This may significantly affect the life and reliability of the coil and the control rod drive mechanism. How to overcome the above-mentioned shortcomings of the high-temperature resistant coil ceramic skeleton and increase the reliability and insulation performance of the ceramic skeleton coil is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide an electromagnetic coil for a control rod driving mechanism of a nuclear power plant.

[0007] The technical solution adopted by the utility model to solve the technical problem is: construct an electromagnetic coil for a control rod driving mechanism of a nuclear power plant, which includes:

[0008] The ceramic coil frame comprises an inner frame cylinder, an outer frame cylinder connected to the inner frame cylinder and a cover plate, wherein the cover plate is connected to the inner frame cylinder and the outer frame cylinder at the same time, and the inner frame cylinder, the outer frame cylinder and the cover plate are enclosed to form a winding area space.

[0009] The insulating strip assembly comprises a first insulating strip and a second insulating strip. The first insulating strip covers the outer surface of the inner cylinder of the frame, and the second insulating strip covers the outer surface of the outer cylinder of the frame.

[0010] A winding wire is arranged in the winding area space, and the winding wire is arranged on the periphery of the first insulating strip.

[0011] In some embodiments, the inner cylinder of the skeleton includes a main body and a connecting part integrally formed with the main body, the main body and the connecting part are vertically arranged, the lower end of the outer cylinder of the skeleton is connected to the connecting part, and the cover plate is jointly connected to the upper end of the main body and the upper end of the outer cylinder of the skeleton.

[0012] In some embodiments, the inner cylinder of the skeleton, the outer cylinder of the skeleton and the cover plate are all sintered and connected by ceramic powder material.

[0013] In some embodiments, the first insulating strip is covered on the outer surface of the inner cylinder of the skeleton by overlapping winding or overall covering, and the second insulating strip is covered on the outer surface of the outer cylinder of the skeleton by overlapping winding or overall covering.

[0014] In some embodiments, the first insulating strip is covered on the outer surface of the inner cylinder of the framework in a longitudinal or circumferential manner;

[0015] The second insulating strip is covered on the outer surface of the inner cylinder of the frame in a longitudinal or circumferential manner. When the second insulating strip is covered on the outer surface of the inner cylinder of the frame in a longitudinal manner, the second insulating strip is also covered on the outer surface of the cover plate.

[0016] In some embodiments, the first insulating strip is bonded to the outer surface of the inner cylinder of the skeleton by a high temperature resistant adhesive, and the second insulating strip is bonded to the outer surface of the outer cylinder of the skeleton by a high temperature resistant adhesive.

[0017] In some embodiments, the first insulating strip and the second insulating strip are both made of insulating material;

[0018] The insulating material is glass fiber material, mica material or a composite material containing metal wires.

[0019] In some embodiments, the electromagnetic coil for a control rod drive mechanism of a nuclear power plant further includes a lead wire connected to the winding wire.

[0020] In some embodiments, the cover plate is provided with a lead hole for the lead wire to pass through.

[0021] In some embodiments, the winding wire is formed by high temperature resistant electromagnetic wire, and the high temperature resistant electromagnetic wire is wound outside the first insulating strip according to a set number of layers and turns.

[0022] The implementation of the utility model has the following beneficial effects: the electromagnetic coil for the control rod drive mechanism of a nuclear power plant can increase the overall strength of the ceramic coil skeleton through the arrangement of the insulating strip assembly, and can improve the overall insulation performance of the ceramic coil skeleton. Even if cracking occurs under conditions such as vibration and collision, the structural form of the ceramic coil skeleton can still be maintained without collapse and falling off, thereby ensuring the stability of the insulation performance of the ceramic coil skeleton, improving the reliability of the ceramic coil skeleton and extending its service life. The insulating strip assembly also provides a buffering effect between the cylinder inside the skeleton and the winding wire, and between the ceramic coil skeleton and other components, which can reduce the risk of collision and extrusion cracking of the ceramic coil skeleton. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0024] Figure 1 It is a schematic diagram of the structure of the ceramic coil skeleton in some embodiments of the utility model;

[0025] Figure 2 is a schematic diagram of the arrangement of the first insulating strip in some embodiments of the utility model;

[0026] Figure 3 It is a schematic diagram of the longitudinal coverage of the insulating strip in some embodiments of the utility model;

[0027] Figure 4 is a schematic diagram of the arrangement of the first insulating strip in some embodiments of the utility model;

[0028] Figure 5 It is a schematic diagram of the overall arrangement of electromagnetic coils for a control rod drive mechanism of a nuclear power plant in some embodiments of the utility model. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0030] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or one or more intermediate elements may be provided. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0031] See also Figures 1 to 5 , is an electromagnetic coil for a control rod drive mechanism of a nuclear power plant in some embodiments of the utility model, which includes a ceramic coil skeleton 1, an insulating strip assembly 2 and a winding wire 3. The ceramic coil skeleton 1 includes a skeleton inner cylinder 11, a skeleton outer cylinder 12 connected to the skeleton inner cylinder 11 and a cover plate 13, the cover plate 13 is connected to the skeleton inner cylinder 11 and the skeleton outer cylinder 12 at the same time, and the skeleton inner cylinder 11, the skeleton outer cylinder 12 and the cover plate 13 are enclosed to form a winding area space 14.

[0032] The ceramic coil frame 1 is made of ceramic material or ceramic-based composite material, which has been widely used in aerospace, energy, metallurgy and other industries, and has high reliability. It can be used for the electromagnetic coil structure of the high-temperature control rod drive mechanism, and then for the new type of self-heating cooling and ventilation stack top structure, which can simplify the complexity of stack top structure items, save stack top space, facilitate the layout and installation of the stack top structure and in-service maintenance, has excellent high temperature resistance and insulation performance, can solve the problem of easy aging deformation and insulation failure of ordinary coil frames in high temperature environment, and increase the service life of the coil.

[0033] like Figures 2 to 5 As shown, the insulating strip assembly 2 includes a first insulating strip 21 and a second insulating strip 22. The first insulating strip 21 covers the outer surface of the inner cylinder 11 of the skeleton, and the second insulating strip 22 covers the outer surface of the outer cylinder 12 of the skeleton. The outer surface of the inner cylinder 11 of the skeleton is the surface of the inner cylinder 11 of the skeleton facing the winding area space 14, and the outer surface of the outer cylinder 12 of the skeleton is the surface of the outer cylinder 12 of the skeleton facing away from the winding area space 14. The winding wire 3 is arranged in the winding area space 14, and the winding wire 3 is arranged on the periphery of the first insulating strip 21. The winding wire 3 is wound by high temperature resistant electromagnetic wire, and the high temperature resistant electromagnetic wire is wound outside the first insulating strip 21 according to the set number of layers and turns. The above insulating strips are all bendable flexible insulating strips, and the first insulating strip 21, the second insulating strip 22 and the ceramic coil skeleton 1 form an integral part.

[0034] In specific operation, the insulating strip assembly 2 can be installed in two stages. First, it is covered on the outer surface of the inner cylinder 11 of the skeleton, and then the winding wire 3 is installed. After that, the outer cylinder 12 of the skeleton and the cover plate 13 are fixedly connected to the inner cylinder 11 of the skeleton. At this time, the ceramic coil skeleton 1 forms a closed structure, and finally the second insulating strip 22 is covered on the outer surface of the outer cylinder 12 of the skeleton.

[0035] It is understandable that, since the ceramic coil skeleton 1 is made of ceramic material, the structural strength and insulation performance of the ceramic coil skeleton 1 are provided by the structure of the cylinder and the cover plate 13. Once the cylinder or the cover plate 13 is brittlely broken, it will directly and seriously affect the structural morphology and insulation performance of the coil skeleton. In addition, inside the ceramic coil skeleton 1, the winding wire 3 is in direct contact with the wall of the skeleton and is potted and solidified. There is no buffer structure, and the skeleton may be squeezed and cracked under thermal expansion and contraction. There is no buffer structure between the outside of the shell of the ceramic coil skeleton 1 and the inner wall 5 of the yoke. Both the ceramic coil skeleton 1 and the metal yoke are hard materials. Under vibration conditions such as coil transportation, hoisting, and long-term operation and thermal expansion and contraction, the ceramic coil skeleton 1 may be bumped, damaged, squeezed, deformed, and cracked. The above situation will directly affect the structural morphology, insulation performance, and service life of the coil.

[0036] Therefore, in this embodiment, the first insulating strip 21 is covered on the outer surface of the inner cylinder 11 of the skeleton, and the winding wire 3 is arranged on the outer periphery of the first insulating strip 21. The first insulating strip 21 is arranged between the inner cylinder 11 of the skeleton and the winding wire 3 to form an insulating buffer layer. At the same time, the second insulating strip 22 is covered on the outer periphery of the ceramic coil skeleton 1, and also provides a buffering effect for the contact between the ceramic coil skeleton 1 and the inner wall 5 of the yoke. The setting of the insulating strip assembly 2 can increase the overall strength of the ceramic coil skeleton 1, and can improve the overall insulation performance of the ceramic coil skeleton 1. Even if cracking occurs under vibration and collision, the structural form of the ceramic coil skeleton 1 can still be kept from collapsing and falling off, ensuring the insulation performance of the ceramic coil skeleton 1. Stable, improve the reliability of the ceramic coil skeleton 1 and extend its service life. The insulating strip assembly 2 also provides a buffering effect between the inner cylinder 11 of the skeleton and the winding wire 3, and between the ceramic coil skeleton 1 and the inner wall 5 of the yoke, which can reduce the risk of collision and extrusion cracking of the ceramic coil skeleton 1.

[0037] like Figure 1 As shown, the frame inner cylinder 11 includes a main body 111 and a connecting portion 112 integrally formed with the main body 111, the main body 111 and the connecting portion 112 are vertically arranged, the lower end of the frame outer cylinder 12 is connected to the connecting portion 112, and the cover plate 13 is connected to the upper end of the main body 111 and the upper end of the frame outer cylinder 12. It can be understood that the frame inner cylinder 11 can be a cylinder structure formed by an L-shaped structure rotating around the central axis of the frame inner cylinder 11, the frame outer cylinder 12 serves as the outer shell of the frame inner cylinder 11, and the cover plate 13 covers the upper part of the frame inner cylinder 11 and the frame outer cylinder 12.

[0038] The inner cylinder 11 of the frame, the outer cylinder 12 of the frame and the cover plate 13 are all sintered and connected by ceramic powder material. Ceramic powder material is a lightweight non-metallic multifunctional material with good dispersibility, high hiding power, high whiteness, good suspension, good chemical stability, good plasticity, high heat resistance, low density, low ignition loss, good light scattering and good insulation. The sintering connection method of ceramic powder material can ensure the overall strength of the ceramic coil frame 1.

[0039] In addition, the first insulating strip 21 is covered on the outer surface of the frame inner cylinder 11 by overlapping winding or overall covering, and the second insulating strip 22 is covered on the outer surface of the frame outer cylinder 12 by overlapping winding or overall covering. It can be understood that the insulating strip winding method can adopt narrower strips to overlap and wrap, or adopt wide strips to wrap as a whole, and the thickness and number of layers of the insulating strip winding are determined according to needs.

[0040] Furthermore, the first insulating strip 21 is covered on the outer surface of the inner cylinder 11 of the frame in a longitudinal or circumferential manner, and the second insulating strip 22 is covered on the outer surface of the inner cylinder 11 of the frame in a longitudinal or circumferential manner. When the second insulating strip 22 is covered on the outer surface of the inner cylinder 11 of the frame in a longitudinal manner, the second insulating strip 22 is also covered on the outer surface of the cover plate 13. This longitudinal covering method can more comprehensively protect the ceramic coil frame 1. Figure 2 and Figure 4 As shown, it is a schematic diagram of the circumferential coverage of the insulating strip, such as Figure 3 Shown is a schematic diagram of the longitudinal coverage of the insulating strip.

[0041] The first insulating strip 21 is bonded to the outer surface of the inner cylinder 11 of the frame by a high temperature resistant adhesive, and the second insulating strip 22 is bonded to the outer surface of the outer cylinder 12 of the frame by a high temperature resistant adhesive to strengthen the tightness of the insulating strips. The first insulating strip 21 and the second insulating strip 22 are made of insulating material, which is glass fiber material, mica material or a composite material containing metal wires.

[0042] The electromagnetic coil for the control rod driving mechanism of the nuclear power plant also includes a lead wire 4, which is connected to the winding wire 3. The cover plate 13 is provided with a lead hole 131 for the lead wire 4 to pass through. The lead hole 131 is used for the lead wire 4 to enter and exit.

[0043] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. An electromagnetic coil for a control rod drive mechanism of a nuclear power plant, characterized in that: include: A ceramic coil frame (1), comprising a frame inner cylinder (11), a frame outer cylinder (12) connected to the frame inner cylinder (11), and a cover plate (13), wherein the cover plate (13) is connected to both the frame inner cylinder (11) and the frame outer cylinder (12), and the frame inner cylinder (11), the frame outer cylinder (12), and the cover plate (13) are enclosed to form a winding area space (14); An insulating strip assembly (2), comprising a first insulating strip (21) and a second insulating strip (22), wherein the first insulating strip (21) covers the outer surface of the inner cylinder (11) of the frame, and the second insulating strip (22) covers the outer surface of the outer cylinder (12) of the frame; A winding wire (3) is arranged in the winding area space (14); the winding wire (3) is arranged on the periphery of the first insulating strip (21).

2. The electromagnetic coil for a control rod drive mechanism of a nuclear power plant according to claim 1, characterized in that: The inner cylinder (11) of the skeleton comprises a main body (111) and a connecting portion (112) integrally formed with the main body (111); the main body (111) and the connecting portion (112) are vertically arranged; the lower end of the outer cylinder (12) of the skeleton is connected to the connecting portion (112); and the cover plate (13) is commonly connected to the upper end of the main body (111) and the upper end of the outer cylinder (12).

3. The electromagnetic coil for a control rod drive mechanism of a nuclear power plant according to claim 1, characterized in that: The inner cylinder (11) of the framework, the outer cylinder (12) of the framework and the cover plate (13) are all sintered and connected by ceramic powder material.

4. The electromagnetic coil for a control rod drive mechanism of a nuclear power plant according to claim 1, characterized in that: The first insulating strip (21) is covered on the outer surface of the inner cylinder (11) of the frame by overlapping winding or overall covering, and the second insulating strip (22) is covered on the outer surface of the outer cylinder (12) of the frame by overlapping winding or overall covering.

5. The electromagnetic coil for a control rod drive mechanism of a nuclear power plant according to claim 1, characterized in that: The first insulating strip (21) is covered on the outer surface of the inner cylinder (11) of the framework in a longitudinal or circumferential manner; The second insulating strip (22) is covered on the outer surface of the inner cylinder (11) of the frame in a longitudinal or circumferential manner. When the second insulating strip (22) is covered on the outer surface of the inner cylinder (11) of the frame in a longitudinal manner, the second insulating strip (22) is simultaneously covered on the outer surface of the cover plate (13).

6. The electromagnetic coil for a control rod drive mechanism of a nuclear power plant according to claim 1, characterized in that: The first insulating strip (21) is bonded to the outer surface of the inner cylinder (11) of the frame by a high temperature resistant adhesive, and the second insulating strip (22) is bonded to the outer surface of the outer cylinder (12) of the frame by a high temperature resistant adhesive.

7. The electromagnetic coil for a control rod drive mechanism of a nuclear power plant according to claim 1, characterized in that: The first insulating strip (21) and the second insulating strip (22) are both made of insulating material; The insulating material is glass fiber material, mica material or a composite material containing metal wires.

8. The electromagnetic coil for a control rod drive mechanism of a nuclear power plant according to claim 1, characterized in that: The electromagnetic coil for the control rod driving mechanism of a nuclear power plant further comprises a lead wire (4), and the lead wire (4) is connected to the winding wire (3).

9. The electromagnetic coil for a control rod drive mechanism of a nuclear power plant according to claim 8, characterized in that: The cover plate (13) is provided with a lead hole (131) for the lead wire (4) to pass through.

10. The electromagnetic coil for a control rod drive mechanism of a nuclear power plant according to claim 1, characterized in that: The winding wire (3) is formed by winding a high temperature resistant electromagnetic wire, and the high temperature resistant electromagnetic wire is wound outside the first insulating strip (21) according to a set number of layers and turns.

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