阅读说明：本技术 控制棒驱动机构及其线圈组件 (Control rod drive mechanism and coil assembly thereof ) 是由 卢朝晖 李泽文 靳书武 陈叶青 刘亚男 刘青松 唐叔建 路广遥 芮旻 周国丰 胡 于 2020-12-11 设计创作，主要内容包括：本发明公开一种线圈组件,套装于控制棒驱动机构中的耐压壳组件之密封壳外,包含隔磁片及至少两组套装于密封壳外且各自形成独立的封闭磁路的分体式磁轭结构,所有分体式磁轭结构沿密封壳的轴向对接组合及固定,隔磁片夹设于相邻两分体式磁轭结构之间。本发明的线圈组件能减少动力线圈磁路之间的相互干扰并提高钩爪组件动作的可靠性,还具有结构简单和装配便捷的优点。另,本发明还公开了一种控制棒驱动机构。(The invention discloses a coil component, which is sleeved outside a sealed shell of a pressure shell component in a control rod driving mechanism and comprises a magnetism isolating sheet and at least two groups of split magnetic yoke structures which are sleeved outside the sealed shell and respectively form independent closed magnetic circuits, wherein all the split magnetic yoke structures are in butt joint combination and fixation along the axial direction of the sealed shell, and the magnetism isolating sheet is clamped between two adjacent split magnetic yoke structures. The coil component can reduce the mutual interference between the magnetic circuits of the power coils and improve the reliability of the action of the hook component, and also has the advantages of simple structure and convenient and fast assembly. In addition, the invention also discloses a control rod driving mechanism.)

1. A coil assembly is sleeved outside a sealed shell of a pressure shell assembly in a control rod driving mechanism and is characterized in that the coil assembly comprises a magnetism isolating sheet and at least two groups of split magnetic yoke structures which are sleeved outside the sealed shell and respectively form independent closed magnetic circuits, all the split magnetic yoke structures are in butt joint combination and fixed along the axial direction of the sealed shell, and the magnetism isolating sheet is clamped between two adjacent split magnetic yoke structures.

2. The coil assembly of claim 1, further comprising a fastener passing through all of the split yoke structures in an axial direction of the sealed housing and securing all of the split yoke structures together.

3. The coil assembly according to claim 2, wherein the split-type magnetic yoke structure comprises magnetic yokes and coils mounted in the magnetic yokes, and the magnetism isolating sheet is sandwiched between the magnetic yokes of two adjacent split-type magnetic yoke structures.

4. A coil assembly according to claim 3, wherein the magnetic shield is snap-fitted to the yoke.

5. The coil assembly according to claim 4, wherein one of the magnetic shielding plate and the magnetic yoke is provided with a protruding structure, and the other of the magnetic shielding plate and the magnetic yoke is provided with a recessed structure for snap-fitting with the protruding structure.

6. The coil assembly of claim 5, wherein the snap protrusions are at least two and spaced apart along a circumferential direction of the sealed housing, and the snap protrusions further extend along a radial direction and/or an axial direction of the sealed housing.

7. The coil assembly of claim 3, wherein the yoke defines a mounting hole for the fastener to be inserted and assembled.

8. The coil assembly of claim 7, wherein the mounting holes are diagonally arranged on the yoke.

9. A coil assembly according to claim 3, wherein the yoke comprises first and second yoke portions for mating combination to form a unitary body, the coil being located within a space defined by the first and second yoke portions.

10. The coil assembly according to claim 3, wherein the fastening member is sleeved with a locking nut at a position outside the two opposite sides of each split-type magnetic yoke structure, the locking nut is in threaded connection with the fastening member, and the magnetic yoke in each split-type magnetic yoke structure is clamped and fixed by the locking nuts outside the two opposite sides of the split-type magnetic yoke structure.

11. The coil assembly of claim 10, wherein a washer is further clamped between the lock nut and the yoke, and the washer is sleeved on the fastener.

12. The coil assembly of claim 10 wherein the fastener is a threaded rod.

13. The coil assembly of claim 10, wherein the fastening member includes a number of thread segments corresponding to the number of the split-type yoke structures and an optical axis segment connected between two adjacent thread segments, the yoke is sleeved on the optical axis segment, and the locking nut is sleeved on the thread segments.

14. The coil assembly of claim 13 wherein the number of threaded segments is one more than the number of split yoke structures.

15. The coil assembly according to claim 2, wherein the magnetic shielding sheet is provided with a sleeving hole, and the magnetic shielding sheet is sleeved outside the sealing shell through the sleeving hole.

16. A control rod drive mechanism comprising a rod position detector assembly, a pressure shell assembly, a finger assembly and a drive rod assembly, wherein the rod position detector assembly is sleeved on a travel sleeve in the pressure shell assembly, the finger assembly is suspended in a sealed shell in the pressure shell assembly, the drive rod assembly is located in the sealed shell, and the drive rod assembly is inserted in the finger assembly and extends to the travel sleeve, characterized in that the reaction push control rod drive mechanism further comprises a coil assembly according to any one of claims 1 to 15, and the coil assembly is sleeved outside the sealed shell.

Technical Field

The invention relates to the field of nuclear reactors, in particular to a control rod driving mechanism and a coil assembly thereof.

Background

It is known in the control rod drive mechanism of a reactor that the yoke of the coil assembly is used to accommodate the coil windings to create a magnetic circuit for the coil magnetic field to ensure the electromagnetic force required for the claw assembly poles in the control rod drive mechanism.

Currently, for example, in the crdm and the coil assembly thereof disclosed in chinese patent application No. 201611051995.X, and the stepping magnetic lift reactor crdm disclosed in chinese patent application No. 200710050738.9, due to the presence of the shared yoke portion between adjacent coils in the coil assembly, the magnetic circuit of the adjacent coils may cross-magnetize, which may adversely affect the operation of the hook assembly and reduce the magnetic energy available for the magnetic circuit.

Therefore, there is a need for a control rod driving mechanism and a coil assembly thereof that can reduce mutual interference between coil magnetic circuits and improve the operational reliability of a finger assembly to overcome the above-mentioned drawbacks.

Disclosure of Invention

An object of the present invention is to provide a control rod driving mechanism capable of reducing mutual interference between coil magnetic circuits and improving operational reliability of a hook assembly.

Another object of the present invention is to provide a coil assembly capable of reducing mutual interference between magnetic circuits of the coil and improving operational reliability of the finger assembly.

In order to achieve the purpose, the coil assembly is sleeved outside a sealed shell of a pressure shell assembly in a control rod driving mechanism and comprises a magnetic isolation sheet and at least two groups of split magnetic yoke structures which are sleeved outside the sealed shell and respectively form independent closed magnetic circuits. All the split magnetic yoke structures are in butt joint combination and fixation along the axial direction of the sealing shell, and the magnetism isolating sheet is clamped between two adjacent split magnetic yoke structures.

Preferably, the coil assembly of the present invention further includes a fastener penetrating all the split yoke structures in the axial direction of the sealed case and fixing all the split yoke structures together.

Preferably, the split-type magnetic yoke structure comprises a magnetic yoke and a coil arranged in the magnetic yoke, and the magnetism isolating sheet is clamped between the magnetic yokes of two adjacent split-type magnetic yoke structures.

Preferably, the magnetic shielding sheet is in clamping fit with the magnetic yoke.

Preferably, one of the magnetic shielding sheet and the magnetic yoke is provided with a convex structure, and the other of the magnetic shielding sheet and the magnetic yoke is provided with a concave structure in clamping fit with the convex structure.

Preferably, the clamping convex structures are at least two and are spaced apart along the circumferential direction of the seal shell, and the clamping convex structures extend along the radial direction and/or the axial direction of the seal shell.

Preferably, the magnet yoke is provided with a mounting hole for the fastener to be inserted and assembled.

Preferably, the mounting holes are diagonally arranged on the yoke.

Preferably, the yoke includes a first yoke portion and a second yoke portion for mating combination to form a unitary body, the coil being located within a space defined by the first and second yoke portions.

Preferably, the fastener is sleeved with a locking nut at a position outside two opposite sides of each split-type magnetic yoke structure, the locking nut is in threaded connection with the fastener, and the magnetic yoke in each split-type magnetic yoke structure is clamped and fixed by the locking nuts outside two opposite sides of the split-type magnetic yoke structure.

Preferably, a washer is clamped between the locking nut and the magnetic yoke, and the washer is sleeved on the fastener.

Preferably, the fastener is a screw.

Preferably, the fastener includes thread segments corresponding to the split-type magnetic yoke structure in number and an optical axis segment connected between two adjacent thread segments, the magnetic yoke is sleeved on the optical axis segment, and the locking nut is sleeved on the thread segments.

Preferably, the number of the threaded segments is one more than the number of the split yoke structures.

Preferably, the magnetism isolating sheet is provided with a sleeving hole, and the magnetism isolating sheet is sleeved outside the sealing shell by means of the sleeving hole.

In order to achieve the purpose, the control rod driving mechanism comprises a rod position detector assembly, a pressure shell assembly, a claw assembly, a driving rod assembly and the coil assembly. The rod position detector assembly is sleeved on a stroke sleeve in the pressure shell assembly, the claw assembly is suspended in a sealing shell in the pressure shell assembly, the driving rod assembly is located in the sealing shell, the driving rod assembly penetrates through the claw assembly and extends to the stroke sleeve, and the coil assembly is sleeved outside the sealing shell.

Compared with the prior art, the coil assembly comprises the magnetic shielding sheets and at least two groups of split magnetic yoke structures which are sleeved outside the sealing shell and respectively form independent closed magnetic circuits, all the split magnetic yoke structures are in butt joint combination and fixation along the axial direction of the sealing shell, and the magnetic shielding sheets are clamped between the adjacent split magnetic yoke structures, so that under the action of the magnetic shielding sheets, coil magnetic induction lines of all the split magnetic yoke structures form closed magnetic circuits along the respective magnetic yokes when the split magnetic yoke structures are electrified, the problems that the magnetic circuits of all power coils are mutually interfered and the magnetic circuits are not independent are solved, and the utilization rate of magnetic energy and the reliability of the action of the hook claw assembly are improved; in addition, the split type magnetic yoke structure which is combined and fixed in a butt joint mode along the axial direction of the sealing shell and the magnetic separation sheet which is clamped between the two adjacent split type magnetic yoke structures enable the coil assembly to be simple and compact in structure and convenient and fast to assemble.

Drawings

FIG. 1 is a schematic plan view of the control rod drive mechanism of the present invention.

FIG. 2 is a schematic view of the internal structure of a coil assembly in a control rod drive mechanism of the present invention in half section.

Fig. 3 is a schematic diagram of a flat structure of a yoke in the coil assembly shown in fig. 2.

Fig. 4 is a schematic view of the internal structure of fig. 3 taken along line B-B.

Fig. 5 is a schematic plan view of the magnetic shield in the coil assembly shown in fig. 2.

Fig. 6 is a schematic view of the internal structure of fig. 5 taken along the line C-C.

Fig. 7 is a schematic plan view of the fastener in the coil assembly of fig. 2.

Detailed Description

Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements.

Referring to FIG. 1, the control rod drive mechanism 100 of the present invention includes a coil assembly 10, a rod position detector assembly 20, a pressure housing assembly 30, a finger assembly (not shown) and a drive rod assembly 40. The rod position detector assembly 20 is mounted on a travel sleeve 31 in the pressure shell assembly 30 for signaling the actual position of the drive rod assembly 40 when the control rod drive mechanism 100 of the present invention is in operation. The hook assembly is suspended in the sealing shell 32 of the pressure shell assembly 30 for realizing the functions of grasping, lifting and inserting the driving rod assembly 40. The driving rod assembly 40 is positioned in the sealing shell 32, the driving rod assembly 40 is arranged in the claw assembly (in particular to the space surrounded by the claw assembly) in a penetrating way and extends to the stroke sleeve 31, and the stroke sleeve 31 provides a movement stroke space for the driving rod assembly 40. The coil assembly 10 is sleeved outside the sealed shell 32, and the coil assembly 10 provides power for the action of the claw assembly as shown in fig. 1. Since the rod position detecting assembly 20, the pressure housing assembly 30, the driving rod assembly 40 and the hook assembly are not improvements, they will not be described in detail herein. More specifically, the following is provided

Referring to fig. 2, the coil assembly 10 includes a magnetic shielding sheet 11 and three split-type magnetic yoke structures 12 sleeved outside the sealed case 32 and each forming an independent closed magnetic circuit. All the split-type magnetic yoke structures 12 are butted, combined and fixed along the axial direction (i.e. the direction indicated by the arrow a or the opposite direction) of the sealing shell 32, and the magnetic separation sheet 11 is clamped between two adjacent split-type magnetic yoke structures 12. Specifically, in fig. 1 and 2, in order to facilitate the assembly and positioning of the coil assembly 10 on the sealed shell 32, the coil assembly 10 further includes a fastener 13, and the fastener 13 penetrates all the split-type yoke structures 12 along the axial direction of the sealed shell 32 and fixes all the split-type yoke structures 12 together; of course, the split-type yoke structure 12 may be fixed to the sealing shell 32 by other methods, such as welding, according to actual requirements, and thus the present invention is not limited thereto. It is understood that, in other embodiments, the split-type yoke structure 12 may also be divided into two, four or five groups, and therefore the description is not limited thereto.

As shown in fig. 2, the split-type magnetic yoke structure 12 includes a magnetic yoke 121 and a coil 122 installed in the magnetic yoke 121, and the magnetism isolating sheet 11 is sandwiched between the magnetic yokes 121 of two adjacent split-type magnetic yoke structures 12, so as to make the structure of the split-type magnetic yoke structure 12 simpler and more compact. Specifically, in fig. 3, 5 and 6, for making reliable installation location between magnetism isolating piece 11 and the yoke 121, magnetism isolating piece 11 and yoke 121 joint cooperation, it is better that the mode that realizes magnetism isolating piece 11 and yoke 121 joint cooperation is: the magnetism isolating sheet 11 is provided with the convex structure 111, and the magnetic yoke 121 is provided with the concave structure 123 matched with the convex structure 111 in a clamping manner, so that the magnetism isolating sheet 11 can be matched with the magnetic yoke 121 in a clamping manner by axially oppositely inserting the convex structure 111 and the concave structure 123, and therefore, the magnetic yoke is more convenient to assemble and more reliable in positioning. For example, in fig. 5 and 6, the snap-fit structures 111 are two and spaced apart along the circumferential direction (i.e., circumferential direction) of the seal housing 32, and the snap-fit structures 111 extend along the radial direction and the axial direction of the seal housing 32 to improve the assembly convenience and the positioning reliability. It can be understood that the number of the snap convex structures 111 can also be one, three or four, which is flexibly selected according to actual needs; in addition, the convex clamping structure 111 can be arranged by the magnetic yoke 121, and the concave structure 123 can be arranged by the magnetic shield sheet 11, so that the purpose of clamping and matching the magnetic yoke 121 and the magnetic shield sheet 111 can be realized; furthermore, the snap projection 111 may also extend in the radial or axial direction of the seal housing 32. In order to conveniently sleeve the magnetism isolating sheet 11 on the sealing shell 32, the magnetism isolating sheet 11 is provided with a sleeve hole 112, so that the magnetism isolating sheet 11 is sleeved outside the sealing shell 32 by means of the sleeve hole 112, but not limited thereto.

As shown in fig. 3, the yoke 121 is provided with mounting holes 124 for the fasteners 13 to pass through, and preferably, the mounting holes 124 are diagonally arranged on the yoke 121, so that the purpose of fixing the coil assembly 10 on the sealed housing 32 more reliably can be achieved by using a pair of fasteners 13, the amount of the fasteners 13 used is reduced, and accordingly, the convenience of assembly is improved. Specifically, in fig. 1, 2 and 4, the yoke 121 includes a first yoke portion 121a and a second yoke portion 121b for mating combination to form a whole, and the coil 122 is located in a space 125 defined by the first yoke portion 121a and the second yoke portion 121b, so that the coil 121 is easily assembled and disassembled in the yoke 121 in the same split-type yoke structure 12; of course, the yoke 121 may be formed integrally, that is, the first yoke portion 121a and the second yoke portion 121b are not detachable from each other, so the above description is not limited thereto.

As shown in fig. 1, the fastening member 13 is sleeved with a locking nut 14 at a position outside of each of the two opposite sides of each of the split-type magnetic yoke structures 12 (e.g., outside of the left and right sides of the split-type magnetic yoke structure 12 in fig. 1), the locking nut 14 is in threaded connection with the fastening member 13, and the magnetic yoke 121 in each of the split-type magnetic yoke structures 12 is clamped and fixed by the locking nuts 14 outside of the two opposite sides of the split-type magnetic yoke structure 12, so that the design ensures the convenience of mounting and positioning each of the split-type magnetic yoke structures 12 on the sealing shell 32, and the integration of the coil assembly. Specifically, in fig. 1, a washer 15 is further clamped between the lock nut 14 and the yoke 121, and the washer 15 is sleeved on the fastener 13 to improve the fixing reliability. More specifically, in fig. 7, the fastening member 13 includes threaded segments 131 corresponding to the number of the split-type yoke structures 12 and optical axis segments 132 connected between two adjacent threaded segments 131, the yoke 121 is sleeved on the optical axis segments 132, and the locking nut 14 is sleeved on the threaded segments 131, so as to further improve the ease of installation and positioning of each split-type yoke structure 12 on the sealing shell 32. For example, the fastening member 13 is a screw, but not limited thereto. It can be understood that the threaded segments 131 correspond to the split-type yoke structure 12, which means that the number of the threaded segments 131 is one more than the number of the split-type yoke structure 12, for example, in fig. 2 and 7, three groups of the split-type yoke structure 12 are provided, and correspondingly, four threaded segments 131 are provided. In addition, when the mounting holes 124 of the yoke 121 are diagonally arranged, the fastening members 13 at this time are a pair.

Compared with the prior art, the coil assembly 10 comprises the magnetic isolation sheet 11 and at least two groups of split type magnetic yoke structures 12 which are sleeved outside the sealing shell 32 and respectively form independent closed magnetic circuits, all the split type magnetic yoke structures 12 are combined and fixed in a butt joint mode along the axial direction of the sealing shell 32, and the magnetic isolation sheet 11 is clamped between the adjacent split type magnetic yoke structures 12, so that under the action of the magnetic isolation sheet 11, coil magnetic induction lines of all the split type magnetic yoke structures 12 form closed magnetic circuits along respective magnetic yokes 121 when the split type magnetic yoke structures are electrified, the problems that the magnetic circuits of power coils are mutually interfered and the magnetic circuits are not independent are solved, and the utilization rate of magnetic energy and the reliability of the action of the hook claw assembly are improved; in addition, the split-type magnetic yoke structure 12 which is combined and fixed in a butt joint mode along the axial direction of the sealing shell 32 and the magnetism isolating sheet 11 which is clamped between the two adjacent split-type magnetic yoke structures 12 enable the coil assembly 10 to be simple and compact in structure and convenient and fast to assemble.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.