A coil for a control rod drive mechanism and a method of assembling a coil

Abstract

The application discloses a kind of electromagnetic coil for control rod drive mechanism and the assembly method of electromagnetic coil, the electromagnetic coil includes inner framework, outer shell, coil winding being arranged between inner framework and outer shell, potting insulation layer being arranged between inner framework and outer shell, the partial material or overall material of the outer shell is metal, the side of the potting insulation layer close to the inner side of the outer shell is further provided with elastomer between the outer shell, the elastomer can be elastically deformed in the radial direction of the electromagnetic coil, elastomer is arranged between the outer shell and potting insulation layer in the state of elastic compression, and elastomer is located between the potting insulation layer and the part of outer shell which is metal material.The electromagnetic coil with the structure can not only prolong the service life of the electromagnetic coil itself, but also be conducive to improving the motion accuracy of control rod drive mechanism and control rod, and the assembly method is the assembly method of the electromagnetic coil.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of reactor control rod drive mechanism parts, in particular to a control rod drive mechanism electromagnetic coil and an electromagnetic coil assembly method. BACKGROUND

[0002] The reactor is the core part of the nuclear power plant, and the control rod drive mechanism (CRDM) of the reactor can lift, insert or keep the control rod in the position in the core to control the fission rate of the reactor, realize the start, stop of the reactor and the adjustment of the reactor power; under the accident condition, the CRDM can also quickly insert the control rod (quick drop rod) to make the reactor emergency shutdown in a short time to ensure safety. The realization of these functions cannot be separated from the CRDM electromagnetic coil assembly. Because of its special working environment and the importance of its function, the CRDM electromagnetic coil must have the characteristics of high temperature resistance, good insulation performance, radiation resistance, moisture resistance, shock resistance and the like.

[0003] For a long time, the highest temperature resistance of the CRDM electromagnetic coil assembly of the nuclear power plant can only reach about 250℃, and the temperature of the reactor coolant is above 300℃, so in actual application, forced ventilation is used to cool the electromagnetic coil assembly to ensure the reliable operation of the CRDM, which complicates the upper structure of the reactor head.

[0004] In order to make the CRDM electromagnetic coil assembly of the nuclear power plant have better resistance to high temperature, the skilled in the art has made many efforts, such as the technical solution provided by the invention patent application with the application number of CN201410500311.4 and the name of electromagnetic coil insulation structure and electromagnetic coil outer shell and electromagnetic coil inner skeleton, and the technical solution provided by the invention patent application with the application number of CN201520855201.X and the name of high-temperature-resistant electromagnetic coil skeleton, inner skeleton body and outer shell body thereon, which can well solve the problem of insufficient resistance to high temperature of the CRDM electromagnetic coil assembly of the nuclear power plant in the prior art.

[0005] Further optimization of the structure design of the electromagnetic coil will undoubtedly promote the further development of China's nuclear power industry. SUMMARY

[0006] In view of the problem of further optimization of the structure design of the electromagnetic coil which will undoubtedly promote the further development of China's nuclear power industry, the present application provides a control rod drive mechanism electromagnetic coil and an electromagnetic coil assembly method. The electromagnetic coil with the structure can not only prolong the service life of the electromagnetic coil itself, but also be conducive to improving the movement precision of the control rod drive mechanism and the control rod. The assembly method is the assembly method of the electromagnetic coil.

[0007] Aiming at the above problems, the electromagnetic coil for control rod drive mechanism and the assembling method of the electromagnetic coil provided by the application achieve the purpose through the following technical points:

[0008] The electromagnetic coil for control rod drive mechanism comprises an inner framework, an outer shell, a coil winding arranged between the inner framework and the outer shell, and a potting insulation layer arranged between the inner framework and the outer shell, wherein the outer shell is partially or entirely made of metal, and an elastomer is arranged between the side of the potting insulation layer close to the outer shell and the inner side of the outer shell, the elastomer can be elastically deformed in the radial direction of the electromagnetic coil, the elastomer is arranged in an elastically compressed state between the outer shell and the potting insulation layer, and the elastomer is located between the potting insulation layer and the part of the outer shell made of metal.

[0009] For a long time, the main factor restricting the improvement of the temperature resistance grade of the CRDM electromagnetic coil is the material and structure of the coil framework (the inner framework and the outer shell). The existing CRDM electromagnetic coil framework is mostly made of high polymer materials such as glass fiber reinforced polyether ether ketone (PEEK), which will gradually soften and fail at 250 DEG C high temperature. In view of the problem of the influence of the above material on the performance of the electromagnetic coil, in the prior art, there are coil frameworks provided with flow interruption grooves and integral metal cylinder coil frameworks meeting certain resistivity requirements.

[0010] The main body of the coil framework provided with the flow interruption grooves and the integral metal cylinder coil framework have more excellent high temperature resistance performance relative to the electromagnetic coil framework made of high polymer materials in the prior art, which can not only avoid the use of cooling components in the control rod drive mechanism, but also have more excellent service life and performance stability.

[0011] In the specific application process, the temperature environment of the whole electromagnetic coil is fluctuant during its whole life, such as the temperature difference of about 300 DEG C during the maintenance period and the working period, which leads to the different thermal expansion between the metal part of the electromagnetic coil skeleton and the potting insulation layer. For the outer shell, the thermal expansion of the potting insulation layer is generally less than that of the outer shell. Although the potting insulation layer is obtained by heating the potting material in the general preparation process, there is a possibility that the gap between the electromagnetic coil and the outer shell occurs during the service of the electromagnetic coil (the potting insulation layer is potting when the potting material is heated, and the specific potting temperature is close to the working temperature of the electromagnetic coil. After the preparation of the electromagnetic coil is completed and the slow cooling is completed, the outer shell is under internal pressure. However, during the whole service of the electromagnetic coil, due to high temperature creep, the outer shell changes from elastic deformation to plastic deformation, and the expansion amount of the outer shell is still greater than the thermal expansion amount of the potting insulation layer), which makes the potting insulation layer move with the coil winding and collide with the outer shell during the working of the electromagnetic coil, causing the damage of the potting insulation layer, the change of the cooperation state of the potting insulation layer and the coil winding, the lateral displacement of the lifting rod and the control rod of the driving mechanism, and finally leading to the damage of the electromagnetic coil, the eccentric wear of the control rod driving mechanism and the control rod.

[0012] In the structural design of the scheme, for the above gap, an elastic body is used to fill the gap, and the elastic body is elastically deformed in the radial direction of the electromagnetic coil to avoid direct collision or buffer the collision between the potting insulation layer and the outer shell when the coil winding is energized. Through the constraint of the elastic body to the movement of the potting insulation layer, the coaxial state of the coil winding relative to the axis of the electromagnetic coil is limited.

[0013] Specifically, in the prior art, the metal part of the outer shell is the main strength layer of the outer shell, and an elastic body is arranged between the side of the potting insulation layer close to the outer shell and the inner side of the outer shell. The elastic body can be elastically deformed in the radial direction of the electromagnetic coil, and the elastic body is arranged in an elastically compressed state between the outer shell and the potting insulation layer, and the elastic body is located between the potting insulation layer and the metal part of the outer shell, which aims to achieve that the elastic body is elastically compressed during the assembly of the electromagnetic coil, and after the expansion of the outer shell during the use of the electromagnetic coil, the elastic body fills the gap caused by the different expansion amounts by elastic rebound, at this time, the elastic body acts as a support between the potting insulation layer and the coil winding, and when the coil winding has a tendency to change the radial position or during the change of the radial position, the elastic body is used to constrain the potting insulation layer, so as to stabilize the position of the coil winding, optimize the stress of the potting insulation layer, prolong the life of the electromagnetic coil, and improve the movement accuracy of the control rod driving mechanism and the control rod.

[0014] Preferably, the elastic body is arranged to have an elastic deformation amount greater than the gap width that may occur during operation of the electromagnetic coil, so that the outer shell body can always constrain the potting insulation layer by using the elastic body, thereby avoiding collision of the potting insulation layer during use.

[0015] As a further technical solution of the electromagnetic coil:

[0016] In order to constrain and protect the potting insulation layer from any radial deviation of the elastic body in the circumferential direction of the electromagnetic coil, the elastic body is arranged in a cylindrical structure coaxial with the electromagnetic coil.

[0017] As a specific technical solution that can better withstand the environmental temperature during operation of the electromagnetic coil, and at the same time make the elastic body itself have greater anti-deformation ability to stabilize the radial position of the coil winding, the elastic body is arranged to have a local material or an overall material that is metal, and the elastic compression occurs on the part of the elastic body that is metal.

[0018] As a simple structure, easy to process and prepare, the elastic body is arranged to include multiple elastic plates each bent from a corrugated metal plate, the elastic plates are equidiameter arc-shaped plates, and the multiple elastic plates are arranged in an equidistant manner between the outer shell body and the potting insulation layer relative to the axis of the electromagnetic coil. In the specific structural design of this solution, not only is the metal material used as an elastic support or constraint between the potting insulation layer and the coil winding, but also the technical solution that the elastic body can constrain and protect the potting insulation layer from any radial deviation in the circumferential direction of the electromagnetic coil, and at the same time, by arranging an insulating gap between the elastic plates, the electromagnetic coil can avoid generating a circumferential eddy current around the coil winding in the circumferential direction of the electromagnetic coil during operation, thereby affecting the performance of the electromagnetic coil.

[0019] In order to make the elastic plates have a more stable relative position relationship, so that each elastic plate can reliably protect and buffer the potting insulation layer during the entire life cycle of the electromagnetic coil, an isolation strip is arranged between any two adjacent elastic plates in the circumferential direction of the electromagnetic coil, the length direction of the isolation strip is along the axis direction of the electromagnetic coil, both sides of the isolation strip are connected with the end portions of the corresponding elastic plates, the isolation strip can be elastically deformed in the radial direction of the electromagnetic coil, and the isolation strip serves as an insulator between the two elastic plates. In this solution, the isolation strip serves as a filler between the elastic plates, and the relative position between the elastic plates is constrained by the isolation strip, thereby stabilizing the relative position between the elastic plates.

[0020] In order to enable the isolation strip itself to provide elastic support for the potted insulation layer to achieve the purpose of position constraint and buffering, while avoiding the generation of annular eddy current on the elastic body as described above, it is provided that: the isolation strip includes a metal coil located on the inner side and a sheath wrapped on the outer side of the metal coil, the metal coil is in strip shape and is wound by elastic material, and the sheath serves as an insulator between the metal coil and the elastic plate. As a person skilled in the art, the above sheath is under pressure in specific use, so the material selection for the sheath can be based on the temperature tolerance of the existing materials. Preferably, since the above sheath has surface wear during the entire working period of the electromagnetic coil, the sheath is preferably made of wear-resistant non-metallic material.

[0021] Unlike the existing shell, in the present scheme, due to the existence of the elastic body, the shell may be continuously pressed during the entire service life, considering the strength of the shell, it is designed that: the shell as a whole is a metal cylinder, and the material of the shell is a metal with an electrical resistivity of not less than 1Ωmm 2 / m at 20℃. The above limitation on electrical resistivity is intended to consider the influence of the annular eddy current introduced by the shell on the normal operation of the electromagnetic coil as described above.

[0022] Unlike the existing shell, in the present scheme, due to the existence of the elastic body, the shell may be continuously pressed during the entire service life, considering the strength of the shell, it is designed that: the shell is a metal cylinder provided with a flow breaking groove, and an inlay is embedded in the flow breaking groove to enable the shell to form a complete cylindrical structure, the inlay includes a metal body and an insulating sleeve wrapped on the outer side of the metal body, and the metal body is interacted with the metal cylinder at both sides: when the metal cylinder expands and contracts, the metal body is pulled or pressed;

[0023] The insulating sleeve serves as an insulating component between the metal body and the metal cylinder. Unlike the inlay of the prior art, the structure of the inlay is further limited in the present scheme, which aims to utilize the better stress capacity of the metal body to enable the shell to form a complete cylindrical structure to withstand the pressure from the elastic body, and the purpose of the insulating sleeve is equivalent to the sheath provided above. For the design of the insulating sleeve, such as the insulating sleeve clamped between the metal body and the metal cylinder, the material selection of the insulating sleeve can be based on the temperature tolerance of the existing materials. Preferably, since the above insulating sleeve has surface wear during the entire working period of the electromagnetic coil, the insulating sleeve is preferably made of wear-resistant non-metallic material.

[0024] As a simple structure, the technical scheme is convenient for completing the connection of the outer shell, and is characterized in that: the connection of the metal cylinder and the metal main body is realized by the following mode: one of the metal cylinder and the metal main body is provided with a clamping groove, and the other is provided with a clamping convex, the clamping groove and the clamping convex are both in a strip shape and have a length direction along the axial direction of the electromagnetic coil, and the clamping convex is embedded in the clamping groove. In specific application, the insulating sleeve is sleeved on the metal main body, and after the cooperation is completed, the insulating sleeve serves as an insulating interlayer between the clamping groove and the clamping convex.

[0025] The application further discloses an assembling method of an electromagnetic coil for a control rod drive mechanism, the electromagnetic coil being the electromagnetic coil according to any one of the preceding electromagnetic coils, and the assembling method comprising the following steps performed in sequence:

[0026] S1, a combined body formed by the coil winding and the pouring insulation layer is prepared by using a mold, and an outer shell is prepared;

[0027] S2, relative position fixation of the elastic body on the outer shell is completed, and the assembling of the combined body, the outer shell and the elastic body is completed by using strength expansion connection;

[0028] In step S2, the relative position fixation is that one end of the elastic body is exposed to the outside of the outer shell, and after the relative position fixation is completed, the part of the elastic body extending out of the outer shell is bent by using the constraint of the end part of the outer shell on the elastic body, and the bending is used to form an enlarged part at the end part of the elastic body, which facilitates the introduction of the combined body.

[0029] Different from the prior art, in the assembling method provided above, when the pouring insulation layer is obtained, the direct use of the outer shell as a mold in the prior art is changed to that the combined body is prepared before the curing of the outer shell and the coil winding, and then the assembling of the electromagnetic coil is completed by using the strength expansion connection. Different from the wrapping of the outer shell on the outside of the elastic body, the uneven force in the circumferential direction of the completed wrapped outer shell caused by the friction between the inner wall of the outer shell and the elastic body can be avoided. Different from the fixation of the elastic body on the outer wall of the combined body and then the assembling of the outer shell, the relative position fixation between the elastic body and the outer shell is easier to realize than the relative position fixation between the elastic body and the combined body, because the elastic body and the outer shell are both partially made of metal and are integrally made of metal. Meanwhile, the bending process is further included in step S2, and the obtained enlarged part facilitates the introduction of the combined body to the inside of the elastic body and causes the elastic compression of the elastic body in the process of the introduction, so that the purpose of facilitating the assembling of the electromagnetic coil is achieved.

[0030] As a person skilled in the art, after the assembly is completed, the bulge is cut off to be installed as the end plate of the partial end of the electromagnetic coil framework. For the above-mentioned cylindrical elastomer structure, the bulge is preferably obtained by using the strength expansion process: under the action of the strength expansion, the corresponding end of the elastomer deforms beyond the maximum elastic deformation amount, and then plastically deforms to obtain the bulge. By using this scheme, the coaxiality of the bulge and the elastomer can be better ensured to facilitate the assembly precision of the combination on the outer shell.

[0031] The present application has the following beneficial effects:

[0032] 1. In the structural design of the scheme, for the above-mentioned gap, a technical scheme is proposed for filling the gap with an elastomer, and avoiding direct collision or buffering the collision between the potting insulation layer and the outer shell when the coil winding is energized by the elastic deformation of the elastomer in the radial direction of the electromagnetic coil. By constraining the movement of the potting insulation layer by the elastomer, the coaxial state of the coil winding relative to the electromagnetic coil axis is limited.

[0033] Specifically, in the prior art, the part of the outer shell made of metal material is used as the main strength layer of the outer shell, and an elastomer is arranged between the side of the potting insulation layer close to the outer shell and the inner side of the outer shell. The elastomer can elastically deform in the radial direction of the electromagnetic coil. The elastomer is arranged in an elastically compressed state between the outer shell and the potting insulation layer, and the elastomer is located between the potting insulation layer and the part of the outer shell made of metal material, which aims to: when the electromagnetic coil is assembled, the elastomer is elastically compressed, and after the outer shell expands during the use of the electromagnetic coil, the elastomer fills the gap caused by different amounts of expansion by elastic rebound. At this time, the elastomer acts as a supporting member between the potting insulation layer and the coil winding, and when the coil winding has a tendency to change the radial position or during the change of the radial position, the elastomer constrains the potting insulation layer to stabilize the position of the coil winding and optimize the stress of the potting insulation layer, thereby prolonging the service life of the electromagnetic coil and improving the movement precision of the control rod drive mechanism and the control rod.

[0034] 2. The specific assembly method differs from the existing technology. When obtaining the potting insulation layer, instead of using the outer shell directly as a mold in the existing technology, the assembly is prepared before the outer shell and coil winding are cured. Then, the electromagnetic coil is assembled by strength expansion. This differs from wrapping the outer shell around the elastic body, which avoids uneven stress in the circumferential direction of the encapsulated outer shell due to friction between the inner wall of the outer shell and the elastic body. It also differs from fixing the elastic body to the outer wall of the assembly before assembling the outer shell. Since both the elastic body and the outer shell are partially or entirely made of metal, fixing the relative position between the elastic body and the outer shell is easier to achieve than fixing the relative position between the elastic body and the assembly. At the same time, step S2 also includes a bending process, which makes it easier to introduce the assembly into the inner side of the elastic body and allow the elastic body to generate the required elastic compression during the introduction process, thereby facilitating the assembly of the electromagnetic coil. Attached Figure Description

[0035] Figure 1 This is a structural cross-sectional view of a specific embodiment of an electromagnetic coil for a control rod drive mechanism according to the present invention. In this cross-sectional view, the axis of the electromagnetic coil is located on the cross-section.

[0036] Figure 2 This is a structural cross-sectional view of a specific embodiment of an electromagnetic coil for a control rod drive mechanism according to the present invention, which is different from... Figure 1 In this cross-sectional view, the axis of the electromagnetic coil is perpendicular to the cross-section.

[0037] Figure 3 This is a schematic diagram of a specific embodiment of an electromagnetic coil for a control rod driving mechanism according to the present invention. The schematic diagram is a partial schematic diagram and is a top view or bottom view of an elastic body.

[0038] Figure 4 This is a schematic diagram of a specific embodiment of an electromagnetic coil for a control rod drive mechanism according to the present invention. The schematic diagram is a partial schematic diagram and a cross-sectional view of an elastic body. The cross-sectional view is a schematic diagram of the structure after an enlarged portion is machined at the end of the elastic body.

[0039] The labels in the diagram represent: 1. Inner frame, 2. Outer shell, 3. Coil winding, 4. Encapsulated insulation layer, 5. Elastomer, 51. Enlarged part, 6. Elastic plate, 7. Spacing strip. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the embodiments, but the structure of the present invention is not limited to the following embodiments.

[0041] Example 1:

[0042] likeFigures 1 to 4 As shown in the drawings, the electromagnetic coil for a control rod drive mechanism comprises an inner skeleton 1, an outer shell 2, a coil winding 3 arranged between the inner skeleton 1 and the outer shell 2, and a potting insulation layer 4 arranged between the inner skeleton 1 and the outer shell 2. The outer shell 2 is partially or entirely made of metal. An elastic body 5 is arranged between the side of the potting insulation layer 4 close to the outer shell 2 and the inner side of the outer shell 2. The elastic body 5 can be elastically deformed in the radial direction of the electromagnetic coil. The elastic body 5 is arranged in an elastically compressed state between the outer shell 2 and the potting insulation layer 4, and is located between the potting insulation layer 4 and the part of the outer shell 2 made of metal.

[0043] For a long time, the main factor restricting the improvement of the temperature resistance level of the CRDM electromagnetic coil is the material and structure of the coil skeleton (the inner skeleton 1 and the outer shell 2). The existing CRDM electromagnetic coil skeletons are mostly made of high polymer materials such as glass fiber reinforced polyether ether ketone (PEEK), which will gradually soften and fail at a high temperature of 250℃. In view of the problem of the above material affecting the performance of the electromagnetic coil, the existing technology has a coil skeleton with a flow interruption groove and a whole metal cylinder coil skeleton that meets certain resistivity requirements.

[0044] The above coil skeleton with a flow interruption groove and the whole metal cylinder coil skeleton have more excellent high-temperature resistance than the electromagnetic coil skeletons made of high polymer materials in the prior art, which can not only avoid the use of cooling components in the control rod drive mechanism, but also have more excellent service life and performance stability.

[0045] In the specific application process, the temperature environment of the whole electromagnetic coil is fluctuant during its whole life, such as the temperature difference of about 300°C during the maintenance period and the working period, which leads to different thermal expansion amounts between the metal part of the electromagnetic coil framework and the potting insulation layer 4. For the outer shell 2, the thermal expansion amount of the potting insulation layer 4 is generally less than that of the outer shell 2. Although the potting insulation layer 4 is obtained by heating the potting material and then potting in the general preparation process, there is a possibility of gap between the electromagnetic coil and the outer shell 2 during the service period of the electromagnetic coil (the potting insulation layer 4 is potting when the potting material is heated after potting, and the specific potting temperature is close to the working temperature of the electromagnetic coil. After the preparation of the electromagnetic coil is completed and the slow cooling is completed, the outer shell 2 is under internal pressure. However, during the whole service period of the electromagnetic coil, because of high temperature creep, the outer shell 2 changes from elastic deformation to plastic deformation, and the expansion amount of the outer shell 2 is still greater than the thermal expansion amount of the potting insulation layer 4), which makes the potting insulation layer 4 move with the coil winding 3 and collide with the outer shell 2 during the working period of the electromagnetic coil, such as when the coil winding 3 is energized, the potting insulation layer 4 is damaged, the cooperation state of the potting insulation layer 4 and the coil winding 3 is changed, the driving mechanism such as the lifting rod is shifted, the control rod is shifted, and finally the electromagnetic coil is damaged, the control rod driving mechanism and the control rod are eccentrically worn.

[0046] In the structural design of the present scheme, for the above gap, an elastic body 5 is used to fill the gap, and the elastic body 5 is elastically deformed in the radial direction of the electromagnetic coil to avoid direct collision between the potting insulation layer 4 and the outer shell 2 or to buffer the collision when the coil winding 3 is energized. By restricting the movement of the potting insulation layer 4 by the elastic body 5, the coaxial state of the coil winding 3 relative to the axis of the electromagnetic coil is limited.

[0047] Specifically, in the prior art, the part of the outer shell 2 made of metal material serves as the main strength layer of the outer shell 2, and an elastic body 5 is arranged between the side of the pouring insulation layer 4 close to the outer shell 2 and the inner side of the outer shell 2. The elastic body 5 can be elastically deformed in the radial direction of the electromagnetic coil. The elastic body 5 is arranged in an elastically compressed state between the outer shell 2 and the pouring insulation layer 4, and the elastic body 5 is located between the pouring insulation layer 4 and the part of the outer shell 2 made of metal material. The purpose is to achieve that the elastic body 5 is elastically compressed when the electromagnetic coil is assembled, and after the outer shell 2 expands during use of the electromagnetic coil, the elastic body 5 fills the gap caused by different amounts of expansion through elastic rebound, at this time, the elastic body 5 serves as a support between the pouring insulation layer 4 and the coil winding 3, and when the coil winding 3 has a tendency to change the radial position or during the change of the radial position, the elastic body 5 restrains the pouring insulation layer 4 to stabilize the position of the coil winding 3 and optimize the stress of the pouring insulation layer 4, thereby prolonging the service life of the electromagnetic coil itself and improving the movement accuracy of the control rod drive mechanism and the control rod.

[0048] Preferably, the elastic body 5 is arranged to have an elastic deformation greater than the gap width that may occur during operation of the electromagnetic coil, so that the elastic body 5 can keep the outer shell 2 in a state of restraining the pouring insulation layer 4 at all times, thereby avoiding collision of the pouring insulation layer 4 during use.

[0049] Embodiment 2:

[0050] As shown in Figures 1 to 4 , this embodiment is further limited based on embodiment 1: to make the elastic body 5 have a restraining and protecting effect on any radial deviation of the pouring insulation layer 4 in the circumferential direction of the electromagnetic coil, the elastic body 5 is arranged to have a cylindrical structure coaxial with the electromagnetic coil.

[0051] Embodiment 3:

[0052] As shown in Figures 1 to 4 , this embodiment is further limited based on embodiment 1: as a specific technical solution that can better withstand the environmental temperature during operation of the electromagnetic coil, and make the elastic body 5 itself have greater anti-deformation ability to stabilize the radial position of the coil winding 3, the elastic body 5 is arranged to have a metal material in part or as a whole, and the elastic compression occurs in the part of the elastic body 5 made of metal.

[0053] As a simple structure, easy to process and prepare the elastomer 5 implementation form, set to: the elastomer 5 includes a plurality of pieces of elastic plate 6, which are folded by corrugated metal plate, the elastic plate 6 is equal diameter arc-shaped plate, a plurality of elastic plate 6 is arranged between the outer shell 2 and the potting insulation layer 4 in the form of spacing and relative to the axis of the electromagnetic coil annular distribution. In the specific structure design of the scheme, not only the metal material is used as the elastic support or restraint between the potting insulation layer 4 and the coil winding 3, but also the elastic body 5 has the restraint and protection effect on the potting insulation layer 4 in the circumferential direction of the electromagnetic coil, and at the same time, by setting the elastic plate 6 with an insulating gap, the annular eddy current around the coil winding 3 on the elastic body 5 can be avoided when the electromagnetic coil is working, which affects the performance of the electromagnetic coil.

[0054] In order to make the elastic plate 6 have a more stable relative position relationship, so that each elastic plate 6 can reliably play a protective and buffering performance for the potting insulation layer 4 in the entire life cycle of the electromagnetic coil, it is provided that: in the circumferential direction of the electromagnetic coil, any two adjacent elastic plates 6 are provided with a separation strip 7, the length direction of the separation strip 7 is along the axis direction of the electromagnetic coil, and the two sides of the separation strip 7 are connected with the end of the corresponding elastic plate 6. The separation strip 7 can be elastically deformed in the radial direction of the electromagnetic coil, and the separation strip 7 serves as an insulator between the two corresponding elastic plates 6. In the scheme, the separation strip 7 serves as a filler between the elastic plates 6, and the relative position between the elastic plates 6 is constrained by the separation strip 7 to stabilize the relative position between the elastic plates 6.

[0055] In order to make the separation strip 7 itself provide elastic support for the potting insulation layer 4 to achieve the purpose of position constraint and buffering, and to avoid the annular eddy current on the elastic body 5 as described above, it is provided that: the separation strip 7 includes a metal coil on the inner side and a sheath wrapped on the outer side of the metal coil, the metal coil is in strip shape and is wound by elastic material, and the sheath serves as an insulator between the metal coil and the elastic plate 6. As a person skilled in the art, the sheath is compressed in stress in specific use, so the material selection of the sheath can be considered based on the temperature resistance of the existing material. Preferably, since the sheath has surface wear during the entire working cycle of the electromagnetic coil, the sheath is preferably made of wear-resistant non-metallic material.

[0056] Embodiment 4:

[0057] As Figures 1 to 4As shown, this embodiment further defines the features of Embodiment 1: Unlike the existing outer shell 2, in this design, due to the presence of the elastic body 5, the outer shell 2 may be subjected to continuous pressure throughout its lifespan. Considering the strength of the outer shell 2, it is designed as follows: the outer shell 2 is entirely a metal cylinder, and the material of the outer shell 2 has a resistivity of not less than 1 Ωmm at 20°C. 2 / m of metal. The above limits on resistivity are intended to account for the effect of the toroidal eddy currents, as described above, introduced by the housing 2, on the normal operation of the electromagnetic coil.

[0058] Example 5:

[0059] like Figures 1 to 4 As shown, this embodiment further defines the features of embodiment 1: Unlike the existing outer shell 2, in this solution, due to the presence of the elastic body 5, the outer shell 2 may be subjected to continuous pressure throughout its lifespan. Considering the strength of the outer shell 2, it is designed as follows: the outer shell 2 is a metal cylinder with a flow interruption groove, and the flow interruption groove is also inlaid with an inlay that enables the outer shell 2 to form a complete cylindrical structure. The inlay includes a metal body and an insulating sleeve wrapped around the outside of the metal body. Both sides of the metal body interact with the metal cylinders at both ends of the flow interruption groove: when the metal cylinder expands and contracts, the metal body is subjected to tension or compression.

[0060] The insulating sleeve serves as an insulating component between the metal body and the metal cylinder. Unlike existing inlay designs, this solution further defines the structure of the inlay, aiming to utilize the better load-bearing capacity of the metal body to allow the outer shell 2 to form a complete cylindrical structure to withstand the pressure from the elastic body 5. The purpose of the insulating sleeve is equivalent to the sheath provided above. Regarding the design of the insulating sleeve, such as its clamping position between the metal body and the metal cylinder, the material selection for the insulating sleeve can be based on existing materials, considering temperature resistance. Preferably, since the surface of the insulating sleeve experiences wear throughout the entire working cycle of the electromagnetic coil, it is preferable to use a wear-resistant non-metallic material for the insulating sleeve.

[0061] As a simple structural solution that facilitates the connection of the outer shell 2, the connection between the metal cylinder and the metal body is achieved as follows: one of the metal cylinder and the metal body has a groove, and the other has a protrusion. Both the groove and the protrusion are strip-shaped, and their length direction is along the axis of the electromagnetic coil. The protrusion is embedded in the groove. In practical application, the insulating sleeve is simply fitted onto the metal body: after the fit is complete, the insulating sleeve serves as an insulating interlayer between the groove and the protrusion.

[0062] Example 6:

[0063] The embodiment also discloses an assembling method of the electromagnetic coil of the control rod drive mechanism, the electromagnetic coil being any one of the electromagnetic coils provided in any one of the above embodiments, and the assembling method comprising the following steps performed in sequence:

[0064] S1, a combined body formed by the coil winding 3 and the pouring insulation layer 4 is prepared by using a mold, and an outer shell 2 is prepared;

[0065] S2, the relative position of the elastic body 5 on the outer shell 2 is fixed, and the assembling of the combined body, the outer shell 2 and the elastic body 5 is completed by using the strength expansion joint mode;

[0066] In step S2, the relative position is that one end of the elastic body 5 is exposed to the outside of the outer shell 2, and after the relative position is fixed, the part of the elastic body 5 extending out of the outer shell 2 is bent by using the constraint of the end of the outer shell 2 on the elastic body 5, and the bulging part 51 is formed at the end of the elastic body 5 by using the bending, which facilitates the introduction of the combined body.

[0067] Different from the prior art, in the assembling method scheme provided above, when the pouring insulation layer 4 is obtained, the prior art directly uses the outer shell 2 as the mold is changed to prepare the combined body before the outer shell 2 and the coil winding 3 are solidified, and then the assembling of the electromagnetic coil is completed by using the strength expansion joint mode. Different from wrapping the outer shell 2 on the outside of the elastic body 5, the uneven force in the circumferential direction of the completed outer shell 2 can be avoided due to the friction between the inner wall of the outer shell 2 and the elastic body 5. Different from fixing the elastic body 5 on the outer wall of the combined body and then assembling the outer shell 2, since the elastic body 5 and the outer shell 2 are both partially made of metal and are made of metal as a whole, the relative position between the elastic body 5 and the outer shell 2 is more easily fixed than the relative position between the elastic body 5 and the combined body. Meanwhile, the bending process is further included in step S2, and the obtained bulging part 51 facilitates the introduction of the combined body to the inside of the elastic body 5 and causes the elastic compression of the elastic body 5 in the process of the introduction, so that the purpose of facilitating the assembling of the electromagnetic coil is achieved.

[0068] As a person skilled in the art, after the assembling is completed, the bulging part 51 can be cut off and installed as the end plate of the partial framework of the electromagnetic coil. For the above elastic body 5 structure in the form of a cylinder, the bulging part 51 is preferably obtained by using the strength expansion processing mode: under the action of the strength expansion, the deformation of the corresponding end of the elastic body 5 exceeds the maximum elastic deformation amount, and then the plastic deformation is generated to obtain the bulging part 51. By using this scheme, the coaxiality of the bulging part 51 and the elastic body 5 can be better ensured to facilitate the assembling precision of the combined body on the outer shell 2.

[0069] The above is further detailed description of the present application in combination with specific preferred embodiments, and cannot be deemed as limitation of the specific embodiments of the present application. Other embodiments obtained by those skilled in the art without departing from the technical solutions of the present application shall be included in the protection scope of the present application.

Claims

1. A solenoid for a control rod drive mechanism, comprising an inner skeleton (1), an outer shell (2), a coil winding (3) arranged between the inner skeleton (1) and the outer shell (2), and a potting insulation layer (4) arranged between the inner skeleton (1) and the outer shell (2), wherein the outer shell (2) is partially or entirely made of metal, characterized in that, The elastic body (5) is partially or entirely made of metal, and the elastic compression occurs on the metal part of the elastic body (5). The elastic body (5) includes a plurality of elastic plates (6) each of which is bent from a corrugated metal plate, the elastic plate (6) is an equidiameter arc-shaped plate, and the plurality of elastic plates (6) are arranged in an interval between the outer shell (2) and the potting insulation layer (4) and are distributed in a ring shape relative to the axis of the electromagnetic coil. In the circumferential direction of the electromagnetic coil, an isolation strip (7) is arranged between any two adjacent elastic plates (6), the length direction of the isolation strip (7) is along the axis direction of the electromagnetic coil, the two sides of the isolation strip (7) are connected with the end of the corresponding elastic plate (6), the isolation strip (7) can be elastically deformed in the radial direction of the electromagnetic coil, and the isolation strip (7) serves as an insulator between the two elastic plates (6). The elastic body (5) is a cylindrical structure coaxial with the electromagnetic coil.

2. The electromagnetic coil for a control rod drive mechanism according to claim 1, characterized by The isolation strip (7) includes a metal coil on the inner side and a sheath wrapped on the outer side of the metal coil, the metal coil is in a strip shape and is wound by an elastic material, and the sheath serves as an insulator between the metal coil and the elastic plate.

3. The electromagnetic coil for a control rod drive mechanism according to claim 1, characterized by The outer shell (2) is a metal cylinder, and the material of the outer shell (2) is a metal with an electrical resistivity of not less than 1 Ωmm2 / m at 20°C.

4. The electromagnetic coil for a control rod drive mechanism according to claim 1, characterized by The outer shell (2) is a metal cylinder provided with a flow breaking groove, and an inlay is embedded in the flow breaking groove to form a complete cylindrical structure of the outer shell (2), the inlay includes a metal body and an insulating sleeve wrapped on the outer side of the metal body, and the two sides of the metal body are respectively connected with the metal cylinder at both ends of the flow breaking groove: when the metal cylinder expands and contracts, the metal body is pulled or pressed.

5. The electromagnetic coil for a control rod drive mechanism according to claim 1, characterized by The insulating sleeve serves as an insulating component between the metal body and the metal cylinder. The connection between the metal cylinder and the metal body is realized by the following way: one of the metal cylinder and the metal body is provided with a clamping groove, and the other is provided with a clamping convex, the clamping groove and the clamping convex are both in a strip shape and the length direction of the clamping groove and the clamping convex is along the axis direction of the electromagnetic coil, and the clamping convex is embedded in the clamping groove.

6. The electromagnetic coil for a control rod drive mechanism according to claim 5, characterized by The electromagnetic coil is any one of the electromagnetic coils in claims 1 to 6, and the assembling method includes the following steps in sequence:

7. A method of assembling an electromagnetic coil for a control rod drive mechanism, characterized by, S1, a combined body formed by the coil winding (3) and the potting insulation layer (4) is prepared by using a mold, and the outer shell (2) is prepared; S2, the relative position of the elastic body (5) on the outer shell (2) is fixed, and the assembly of the combined body, the outer shell (2) and the elastic body (5) is completed by using a strong expansion joint. ​ In step S2, the relative position is fixed with one end of the elastic body (5) exposed outside the outer housing (2), and after the relative position is fixed, the part of the elastic body (5) protruding relative to the outer housing (2) is bent by using the constraint of the outer housing (2) end to the elastic body (5), and by using the bending, an enlarged part (51) is formed at the end of the elastic body (5) to facilitate the introduction of the assembly.

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