CN114420401B

CN114420401B - Electromagnetic coil for control rod driving mechanism of nuclear power station

Info

Publication number: CN114420401B
Application number: CN202210001303.XA
Authority: CN
Inventors: 李翔; 米大为; 蒋恩; 卜佳炜; 毛安杰; 刘德明
Original assignee: Shanghai No1 Machine Tool Works Co ltd
Current assignee: Shanghai No1 Machine Tool Works Co ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-12-27
Anticipated expiration: 2042-01-04
Also published as: CN114420401A

Abstract

The embodiment of the invention discloses an electromagnetic coil for a control rod driving mechanism of a nuclear power station, which comprises a coil framework, a coil winding and two binding posts, wherein the coil framework is provided with a coil winding; the coil framework comprises an inner cylinder made of a magnetism isolating material and an outer framework made of a magnetic conducting material, and the outer framework is sleeved on the outer side of the inner cylinder to form a closed winding space between the radial inner side of the outer framework and the radial outer side of the inner cylinder; two leading-out ends are formed at two ends of the coil winding; each binding post comprises a shell and a contact pin; wherein the contact pin of each binding post is electrically connected with a corresponding lead-out terminal. According to the invention, the coil winding is positioned in a closed space and isolated from the external environment through the inner cylinder made of the magnetism isolating material, the outer framework made of the magnetic conducting material and the coil winding arranged in the winding space of the inner cylinder, and the inner cylinder and the outer framework can restrict the magnetic flux direction and compensate the main magnetic circuit when the coil winding works, so that the coil winding is applied to the environment with higher air humidity or alternating operation.

Description

Electromagnetic coil for control rod driving mechanism of nuclear power station

Technical Field

The invention relates to the technical field of nuclear reactor control rod driving mechanisms, in particular to an electromagnetic coil for a nuclear power station control rod driving mechanism.

Background

The control rod driving mechanism is a servo mechanism of a nuclear power station reactor control system and a safety protection system. The control rod has the specific functions of lifting, descending, keeping or quickly inserting the control rod to complete the starting of the reactor, the regulation of the reactor power, the maintenance of the power, the stopping of the reactor and the quick stopping and pushing under the accident condition, is an important action part of the nuclear reactor, and is one of the safe and reliable pipe fittings which directly influence the normal operation of the nuclear reactor. Specifically, the pressurized water reactor control rod driving mechanism can take electromagnetic force as driving force, and the working coil generates electromagnetic force after being electrified, so that the aim of controlling the reactor power is fulfilled by the electromagnetic force driving. Without ventilation cooling, the operating temperature of the solenoid would reach above 300 ℃. Due to the limitations of radiation-resistant and high-temperature-resistant insulating materials and manufacturing processes, inorganic insulating materials such as mica, glass fiber, and silicon oxide are generally used for electromagnetic coils, but inorganic insulating materials generally have the disadvantages of loose structure and poor moisture resistance, so that a large amount of organic materials are still needed for bonding, impregnating, encapsulating, and the like of electromagnetic coils to improve the moisture-resistant and high-temperature-resistant properties of the electromagnetic coils.

The existing organic materials quickly begin to decompose under the high temperature condition of more than 300 ℃. The pressurized water reactor control rod driving structure is difficult to be applied to the operating environment with high air humidity or frequent cold and hot alternation. Therefore, the problem of loose and damaged coils is easily caused, and the operation safety of the reactor and the nuclear power station is further influenced.

In view of the above, it is actually necessary to develop an electromagnetic coil for a control rod driving mechanism in a nuclear power plant, which can be applied to an environment with high air humidity or alternating operation, can resist high temperature, and can prolong the service life of the electromagnetic coil.

Disclosure of Invention

Embodiments of the present invention provide a solenoid coil for a control rod drive mechanism in a nuclear power plant, so as to improve the high temperature resistance of the solenoid coil and prolong the service life of the solenoid coil.

In order to solve the above technical problem, the embodiment of the present invention discloses the following technical solutions: an electromagnetic coil for a control rod driving mechanism of a nuclear power station comprises a coil framework, wherein the coil framework comprises an inner barrel made of a magnetic isolation material and an outer framework made of a magnetic conduction material, and the outer framework is sleeved on the outer side of the inner barrel to form a closed winding space between the radial inner side of the outer framework and the radial outer side of the inner barrel; the coil winding is formed by winding electromagnetic wires in the winding space, and two leading-out ends are formed at two ends of the coil winding; each binding post comprises a shell fixedly connected with the outer framework and a contact pin arranged in the shell, and the contact pin is in insulated connection with the shell through an insulating structure; and the contact pin of each binding post penetrates through the outer framework to extend into the winding space to be electrically connected with one corresponding leading-out terminal.

Except for the above-mentioned one or more disclosed characteristics, insulation structure is the insulating piece, the insulating piece cup joint in the contact pin outside, and through the insulating piece is embedded in the inside of casing, the contact pin both ends stretch out in the casing sets up.

In addition to one or more of the features disclosed above, the housing is made of stainless steel.

In addition to one or more of the features disclosed above, the housing is embedded in and secured to the upper plate.

In addition to one or more of the above-disclosed features, the number of the insulating sheets is at least two, and two of the insulating sheets are respectively disposed at both ends of the contact pins, and the insulating sheets are respectively welded to the contact pins and the housing by vacuum brazing.

In addition to one or more of the features disclosed above, the insulating sheet is made of a ceramic material; and/or the pins are made of nickel plated copper alloy.

In addition to one or more features disclosed above, the coil winding further comprises an encapsulation layer made of an inorganic insulating material, wherein the encapsulation layer is filled between the coil winding and the coil bobbin.

In addition to one or more of the above-mentioned features, the inner cylinder has a hollow cylindrical structure with openings at both ends, the outer frame includes an outer cylinder and an upper plate and a lower plate disposed at both ends of the outer cylinder, and the coil winding is wound in a winding area space of the coil frame and located between the upper plate and the lower plate.

In addition to one or more of the above-mentioned disclosed features, the upper and/or lower ends of the inner cylinder are provided with first limiting grooves, and the first limiting grooves are located on the outer wall surface of the inner cylinder and are radially and inwardly provided along the outer wall surface;

the outer barrel is a hollow cylindrical barrel, second limiting grooves are formed in the upper end and/or the lower end of the outer barrel, and the second limiting grooves are located on the inner wall surface of the outer barrel and are formed outwards along the radial direction of the outer barrel;

the upper plate and/or the lower plate are assembled through the first limiting groove and/or the second limiting groove.

In addition to one or more of the features disclosed above, the terminals are connected to the pins by cold pressing or silver-based brazing; and/or the lead wires are connected with the contact pins in a cold pressing or silver-based soldering mode,

one of the above technical solutions has the following beneficial effects: the coil winding is positioned in a closed space and isolated from the external environment through the inner cylinder made of the magnetism isolating material, the outer framework made of the magnetic conducting material and the coil winding arranged in the winding space, the magnetic flux direction can be restrained and the main magnetic circuit can be compensated through the inner cylinder and the outer framework when the coil winding works, so that the coil winding is applied to the environment with high air humidity or alternating operation, can resist high temperature and can prolong the service life of the coil winding.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of an embodiment of the present application;

FIG. 2 is an enlarged view of FIG. 1 at A;

fig. 3 is an enlarged view of fig. 1 at B.

Reference numerals:

1. an inner barrel; 11. a first limit groove;

2. an outer skeleton; 21. an outer cylinder; 211. a second limit groove; 22. an upper plate; 23. a lower plate;

3. a coil winding; 31. leading out the terminal;

4. a binding post; 41. a housing; 42. inserting a pin; 43. an insulating sheet;

5. and (7) packaging the layer.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Example 1

Referring to fig. 1, fig. 1 is a schematic cross-sectional view of an embodiment of the invention. The application provides a nuclear power station solenoid for control rod drive mechanism adopts closed structural design, and this solenoid receives environmental impact little, can be applied to the great or frequent operational environment of cold and hot alternation of air humidity. The magnetic shielding coil comprises a coil framework, wherein the coil framework comprises an inner cylinder 1 made of a magnetic shielding material and an outer framework 2 made of a magnetic conducting material, and the outer framework 2 is sleeved on the outer side of the inner cylinder 1 to form a closed winding space between the radial inner side of the outer framework 2 and the radial outer side of the inner cylinder 1; and the coil winding 3 is formed by winding electromagnetic wires in the winding space, and two leading-out ends 31 are formed at two ends of the coil winding 3. In this embodiment, the electromagnetic wire is wound in the winding space of the coil bobbin according to the preset number of layers/turns to form the coil winding 3, that is, the coil winding 3 is wound on the outer wall of the inner cylinder 1 made of the magnetism isolating material. When current flows in the coil winding 3, a magnetic field is formed in the circumferential space of the coil winding 3, a magnetic path generated in the magnetic field in the radial direction can be shielded through the magnetism-isolating inner cylinder 1, the direction of the magnetic flux is restrained, and the situation of magnetic flux leakage of the coil winding 3 after the power is on is prevented. The outer framework 2 made of magnetic conductive material can enhance the capacity of the coil to generate magnetic flux, and most of the magnetic circuit can compensate the main magnetic circuit through the magnetic conductive outer framework 2. In this embodiment, the inner winding space can be sealed by the inner cylinder 1 and the outer frame 2, so as to avoid the influence of special operating environments such as high air humidity or alternate operation on the coil winding 3.

Further, the wiring terminal comprises two wiring terminals 4, wherein each wiring terminal 4 comprises a shell 41 fixedly connected with the outer framework 2 and a pin 42 arranged in the shell 41, and the pin 42 is in insulation connection with the shell 41 through an insulation structure. And the pin 42 of each binding post 4 penetrates through the outer frame 2 to extend into the winding space to be electrically connected with a corresponding one of the terminals 31. The contact pin 42 arranged in the shell 41 is used as a connecting carrier to connect the lead wire and the leading-out terminal 31 so as to realize electric connection, the outer side of the contact pin 42 is connected with the shell 41 through an insulating structure, when the coil winding 3 is electrified, the contact pin 42 and the shell 41 can be isolated through the non-conducting insulating structure, the shell 41 is prevented from being electrified, and the power loss when the lead wire is electrically connected with the contact pin 42 can be avoided through the design.

Example 2

Referring to fig. 2, fig. 2 is an enlarged view of the post 4 at a. The insulation structure provided by this embodiment is to ensure the isolation effect between the pin 42 and the housing 41 thereof during the live working, and to avoid the housing 41 from being electrically connected. On the basis of embodiment 1, the insulation structure is an insulation sheet 43, the insulation sheet 43 is sleeved on the outer side of the contact pin 42 and is embedded in the housing 41 through the insulation sheet 43, and two ends of the contact pin 42 extend out of the housing 41. The insulating sheet 43 is made of solid insulating material for isolating the housing 41 and the pin 42, and the insulating sheet 43 has a supporting function. Through the insulating piece 43 circumference and casing 41 scarf joint, make insulating piece 43 can more stabilize the structure position relation of contact pin 42 with casing 41, maintain its electrified stability of working.

Example 3

On the basis of embodiment 3, the housing 41 is made of stainless steel, and the housing 41 made of stainless steel has good high temperature resistance, corrosion resistance and irradiation capability. The coil for the control rod driving mechanism of the nuclear power station in the embodiment can meet the requirement of high-temperature working conditions.

Stated further, the housing 41 is embedded in the upper plate 22 and fixed to the upper plate 22. Preferably, the terminal 4 is connected with the upper plate 22 through a shell 41 in a welding mode, and the shell 41 is embedded into the upper plate 22 and welded, so that the strength of a welding point can be improved, and the situation that a gap or a seam is possibly generated at the root of the welding line during welding is avoided. Will terminal 4 and coil skeleton welding are a whole, can make be stable sealed space in the casing 41, have further improved the humidity resistance of terminal 4.

Example 4

In order to further improve the supporting strength of the insulating structure. The embodiment provides the following technical solutions on the basis of embodiment 4: the quantity of insulating piece 43 is two at least, and two insulating piece 43 disposes respectively in the both ends of contact pin 42, insulating piece 43 through vacuum brazing respectively with contact pin 42 with casing 41 welds. The insulating sheet 43 is welded between the pin 42 and the housing 41 by vacuum brazing, and the strength of the welded portion can be improved by welding an oxide film on the surface in a vacuum environment. And will two insulating piece 43 vacuum brazing is in the both ends of contact pin 42, can balance the contact pin 42 through both ends and make two be vacuum state between the insulating piece 43, will contact pin 42 middle-end and external environment further isolated improve its corrosion resisting degree for the holistic humidity resistance of terminal 4 promotes.

Further, the insulating sheet 43 is made of a ceramic material; and/or the pins 42 are made of nickel plated copper alloy. The contact pin 42 made of the nickel-plated copper alloy has good conductivity and is corrosion resistant. The insulating sheet 43 made of the ceramic material on the peripheral side of the contact pin 42 has discharge resistance and stronger mechanical strength, so that the electromagnetic coil can further have the capability of running underwater.

Example 5

Further, in this embodiment, on the basis of any one of the above embodiments, an encapsulation layer 5 made of an inorganic insulating material is further included, and the encapsulation layer 5 is filled between the coil winding 3 and the coil bobbin. Preferably, the winding space of the coil frame is filled with the modified ceramic material packaging layer 5, and the coil winding 3 is sealed and fixed in the winding space of the coil frame by high-temperature baking and curing, so that the position of the coil winding 3 is stabilized, and the stability of the working state of the coil winding 3 is maintained.

Example 6

This example provides the following scheme based on example 6: inner tube 1 is for having both ends open-ended hollow tubular structure, exoskeleton 2 includes urceolus 21 and locates upper plate 22 and hypoplastron 23 at urceolus 21 upper and lower both ends, coil winding 3 coiling is in coil skeleton's wire winding region space, and lie in between upper plate 22 and the hypoplastron 23. Through the split type design of winding framework, be convenient for coiling coil winding 3. Or the inner barrel 1 can be used for winding a coil for a winding die, and then the coil winding 3 formed by winding is placed in the coil framework, so that the assembly working efficiency can be improved.

Example 7

This example provides the following scheme based on example 7: the upper end and/or the lower end of the inner barrel 1 are/is provided with first limiting grooves 11, and the first limiting grooves are positioned on the outer wall surface and are inwards arranged along the radial direction; the outer cylinder 21 is a hollow cylindrical cylinder, and the upper and/or lower ends of the outer cylinder 21 are provided with second limiting grooves 211 which are located on the inner wall surface and are radially and outwardly arranged; the upper plate 22 and/or the lower plate 23 are assembled through the first restriction groove 11 and/or the second restriction groove 211. Through the first limiting groove 11 and/or the second limiting groove 211, the mounting position of the upper plate 22 and/or the lower plate 23 can be accurately positioned, the working efficiency is improved, meanwhile, the upper plate 22 and/or the lower plate 23 can be welded with the inner cylinder 1 and/or the outer cylinder 21 through the first limiting groove 11 and/or the second limiting groove 211, the contact area is increased, the assembling and machining requirements of the upper plate 22 and/or the lower plate 23 are reduced, the concentrated stress is reduced, and the bearing capacity of the upper plate 22 and/or the lower plate 23 is ensured.

Example 8

This example provides the following scheme based on example 8: the leading-out terminal 31 is connected with the contact pin 42 in a cold pressing or silver-based brazing mode; and/or the lead wires are connected to the pins 42 by cold pressing or silver-based soldering. The end parts of the contact pins 42 are welded in a silver-based brazing mode, gaps or gaps can be avoided from being generated in welding seams, and the strength of welding ends of the contact pins is improved. Preferably, the ends of the pins 42 are also cold-pressed.

The electromagnetic coil for the control rod drive mechanism of the nuclear power plant provided by the embodiment of the invention is described in detail, the principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An electromagnetic coil for a control rod drive mechanism of a nuclear power plant, comprising:

the coil framework comprises an inner cylinder made of a magnetism isolating material and an outer framework made of a magnetic conducting material, wherein the outer framework is sleeved on the outer side of the inner cylinder so as to form a closed winding space between the radial inner side of the outer framework and the radial outer side of the inner cylinder;

the coil winding is formed by winding electromagnetic wires in the winding space, and two leading-out ends are formed at two ends of the coil winding;

each binding post comprises a shell fixedly connected with the outer framework and a contact pin arranged in the shell, and the contact pin is in insulation connection with the shell through an insulation structure;

the contact pin of each binding post penetrates through the outer framework to extend into the winding space to be electrically connected with one corresponding leading-out terminal;

the contact pin of the binding post is electrically connected with the lead wire;

insulation system is for the insulating piece, the insulating piece cup joint in the contact pin outside, and pass through the insulating piece is embedded in the inside of casing, the contact pin both ends stretch out in the casing sets up.

2. The electromagnetic coil for a nuclear power plant control rod drive mechanism as set forth in claim 1,

the housing is made of stainless steel.

3. The electromagnetic coil for a nuclear power plant control rod drive mechanism as set forth in claim 1,

the shell is embedded into the upper plate and is fixedly connected with the upper plate.

4. The electromagnetic coil for a nuclear power plant control rod drive mechanism as set forth in claim 1,

the quantity of insulating piece is two at least, and two the insulating piece disposes respectively in the both ends of contact pin, the insulating piece through vacuum brazing respectively with the contact pin with the casing welding.

5. The electromagnetic coil for a nuclear power plant control rod drive mechanism as set forth in claim 1,

the insulating sheet is made of a ceramic material; and/or

The contact pin is made of nickel-plated copper alloy.

6. The electromagnetic coil for a nuclear power plant control rod drive mechanism as set forth in any one of claims 1 to 5,

the coil winding is characterized by further comprising an encapsulation layer made of an inorganic insulating material, wherein the encapsulation layer is filled between the coil winding and the coil framework.

7. The electromagnetic coil for a nuclear power plant control rod drive mechanism as recited in claim 6,

the inner tube is for having both ends open-ended hollow tubular structure, the ectoskeleton includes the urceolus and locates upper plate and hypoplastron at urceolus upper and lower both ends, the coil winding coiling is in the wire winding region space of coil skeleton, and is located between upper plate and the hypoplastron.

8. The electromagnetic coil for a nuclear power plant control rod drive mechanism as recited in claim 7,

the upper end and/or the lower end of the inner cylinder are/is provided with first limit grooves, and the first limit grooves are positioned on the outer wall surface of the inner cylinder and are inwards arranged along the radial direction of the inner cylinder;

9. The electromagnetic coil for a nuclear power plant control rod drive mechanism as recited in claim 8,

the leading-out end is connected with the contact pin in a cold pressing or silver-based brazing mode; and/or

The lead wires are connected with the contact pins in a cold pressing or silver-based brazing mode.