阅读说明：本技术 控制棒驱动机构及其防偏转钩爪组件 (Control rod drive mechanism and anti-deflection claw assembly thereof ) 是由 卢朝晖 陈叶青 李泽文 刘亚男 胡伦宝 靳书武 刘青松 周国丰 芮旻 唐叔建 路 于 2020-12-11 设计创作，主要内容包括：本发明公开一种控制棒驱动机构及防偏转钩爪组件,防偏转钩爪组件包含上端构件、提升衔铁、移动衔铁、钩爪、保持磁极、保持衔铁、钩爪支承套、下端构件、缓冲管轴、导向键及套管轴。缓冲管轴套于套管轴,导向键嵌于缓冲管轴,上端构件、提升衔铁、移动衔铁、保持磁极、保持衔铁和钩爪支承套及下端构件依次布；钩爪装于缓冲管轴上并与移动衔铁连动；移动衔铁和导向键中的一者开设有轴向导向凹而另一者设有轴向导向凸,轴向导向凸嵌于轴向导向凹内并于轴向导向凹内做轴向滑移；以减少在摇摆、倾斜等复杂工况下防偏转钩爪组件的磨损,确保控制棒驱动机构的可靠运行。(The invention discloses a control rod driving mechanism and an anti-deflection hook component. The buffer pipe shaft is sleeved on the sleeve shaft, the guide key is embedded in the buffer pipe shaft, and the upper end component, the lifting armature, the moving armature, the holding magnetic pole, the holding armature, the claw bearing sleeve and the lower end component are sequentially distributed; the hook claw is arranged on the buffer pipe shaft and is linked with the movable armature; one of the movable armature and the guide key is provided with an axial guide concave while the other is provided with an axial guide convex which is embedded in the axial guide concave and slides axially in the axial guide concave; the abrasion of the deflection-preventing hook component under complex working conditions of swinging, inclining and the like is reduced, and the reliable operation of the control rod driving mechanism is ensured.)

1. An anti-deflection hook component comprises an upper end member, a lifting armature, a moving armature, a hook, a holding magnetic pole, a holding armature, a hook supporting sleeve, a lower end member, a guide key and a sleeve shaft, wherein the upper end member is fixedly sleeved at the upper end of the sleeve shaft, the lower end member is fixedly sleeved at the lower end of the sleeve shaft, the holding magnetic pole is fixedly sleeved at the position of the sleeve shaft between the upper end member and the lower end member, the anti-deflection hook component is characterized by further comprising a buffer tube shaft, the buffer tube shaft is axially slidably sleeved at the position of the sleeve shaft between the upper end member and the holding magnetic pole, the guide key is fixedly embedded at the side wall of the buffer tube shaft, and the lifting armature and the moving armature are sequentially sleeved on the buffer tube shaft from the upper direction to the lower direction of the sleeve shaft, the lifting armature is also fixedly connected with the buffer tube shaft, the movable armature can axially slide on the buffer tube shaft, the retaining armature and the hook claw supporting sleeve are sequentially sleeved on the sleeve shaft in an axially sliding manner from the top to the bottom of the sleeve shaft, the holding armature and the claw bearing sleeve are also positioned between the holding magnetic pole and the lower end member, the claw is pivotally and swingably mounted on the buffer pipe shaft and linked with the moving armature, the movable armature iron is linked with the hook claw to do pivot swing motion in the process of axially sliding relative to the buffer pipe shaft, one of the movable armature iron and the guide key is provided with an axial guide concave and the other is provided with an axial guide convex, the axial guide protrusion is embedded in the axial guide groove in a clearance fit manner, and the axial guide protrusion can also slide in the axial guide groove in an axial direction relative to the axial guide groove.

2. The anti-deflection finger assembly according to claim 1 wherein the axially directed recess of the moving armature extends axially through the moving armature in a direction toward the retained pole.

3. The anti-deflection hook assembly according to claim 2, wherein the side wall of the moving armature defines a lateral through hole for radial communication with the axially directed recess of the moving armature.

4. The anti-deflection finger assembly according to claim 1, wherein the mating surface of the axial guiding projection for clearance fit with the axial guiding recess and/or the mating surface of the axial guiding recess for clearance fit with the axial guiding projection is coated with a wear resistant layer.

5. The anti-deflection hook assembly according to claim 1, wherein the buffer tube shaft defines an insertion space radially penetrating through a sidewall of the buffer tube shaft, and the guide key is located in the insertion space.

6. The anti-deflection hook assembly according to claim 1, further comprising a connecting rod disposed within the moving armature, wherein one end of the connecting rod is hinged to the moving armature, the other end of the connecting rod is hinged to the hook, and an avoiding space for the hook to pivot is formed in a side wall of the sleeve shaft.

7. The anti-deflection finger assembly according to claim 1 wherein the guide key is a square block and the axial guide projection is chamfered.

8. The anti-deflection hook assembly according to claim 1, wherein the upper end member, the sleeve shaft and the lower end member together define an axial passage for the driving rod assembly of the crdm to axially pass through and axially lift or lower, and a radial positioning and centering structure is formed on a passage wall of the axial passage, such that a portion of the axial passage defines a radial positioning and centering passage for the driving rod assembly to pass through and radially position and center the driving rod assembly, and the size of the radial positioning and centering passage is smaller than that of the axial passage.

9. The anti-deflection finger assembly according to claim 8, wherein the radial positive centering structure further defines a portion of the axial channels defining one or more coolant axial flow passages for radially expanding the radial positive centering channels, the plurality of coolant axial flow passages being circumferentially spaced apart.

10. The anti-deflection finger assembly according to claim 9, wherein the radial position limiting centering structures are formed in the channel walls of the axial channels at the upper and lower end members, respectively.

11. The anti-deflection finger assembly according to claim 10, wherein a sidewall of at least one of the upper and lower end members defines a lateral coolant flow passage in communication with the axial coolant flow passage or axial channel, the lateral coolant flow passage extending through the sidewall.

12. The anti-deflection finger assembly according to claim 11 wherein the coolant lateral flow channels and the coolant axial flow channels on the upper and/or lower end members are each radially arranged in the circumferential direction.

13. The anti-deflection finger assembly according to claim 8, wherein the upper end member is a lifting pole or is comprised of a lifting pole and an upper extension extending axially therefrom; the lower end component is a lifting magnetic pole, or the lower end component consists of a positioning nut and a lower expansion piece axially extended from the positioning nut.

14. The anti-deflection finger assembly according to claim 8, wherein the radial position-limiting centering structure has a cross-sectional profile that is a regular polygon having an inner circle with a dimension that is less than the dimension of the axial passage.

15. The anti-yaw hook assembly according to claim 9, wherein said radial positive centering structure has a cross-sectional profile that is a flower-shaped profile comprising first and second arcs of different curvatures alternately arranged to collectively define a central symmetry, all of said first arcs circumscribing a cross-sectional profile of said radial positive centering channel and said second arcs circumscribing a cross-sectional profile of said coolant axial flow passage.

16. The anti-deflection gripper assembly according to claim 15, wherein the first arc has a center on a central symmetry line, the second arc has a center that is offset from the central symmetry line, the axial channel has a cross-sectional profile that is larger in size than a diameter of a circle on which the first arc is located, and the axial channel has a cross-sectional profile that is smaller in size than a diameter of a circle on which the center is located on the central symmetry line and tangent to the second arc.

17. A control rod driving mechanism comprises a rod position detector assembly, a pressure shell assembly, a driving rod assembly and a coil assembly, wherein the rod position detector assembly is sleeved on a stroke sleeve in the pressure shell assembly, the driving rod assembly is installed in a sealing shell, and the coil assembly is sleeved outside the sealing shell.

Technical Field

The invention relates to the field of nuclear reactors, in particular to a control rod driving mechanism and an anti-deflection claw assembly thereof.

Background

It is known that in the case of such a reactor, the reactor may be subjected to complex conditions such as cyclic sway and inclination, and in such a case, the operating control rod drive mechanism cannot be maintained in a fixed vertical state, and the change of the operating environment affects the operation of the hook assembly.

At present, for example, in the stepping magnetic lifting type reactor control rod driving mechanism disclosed in chinese patent application No. 200710050738.9, the control rod driving mechanism can normally operate in the vertical operation state, but under the complex working conditions of tilting, swaying and the like, the control rod driving mechanism can be in the swaying or tilting state at any moment, which causes a tendency of relative deflection to the moving armature of the hook assembly, and at this moment, harmful additional force can be applied to the moving part related to the moving hook, so as to increase the wear of the contact surface, and reduce the reliability and the service life of the control rod driving mechanism.

Accordingly, there is a need for a crdm and an anti-yaw hook assembly that overcomes the above-mentioned deficiencies.

Disclosure of Invention

The invention aims to provide an anti-deflection hook claw assembly which can limit deflection of a moving armature under complex working conditions of inclination, swinging and the like, reduce abrasion of all relevant moving parts of the moving hook claw, axially guide the moving armature and ensure reliable operation of a control rod driving mechanism.

Another object of the present invention is to provide a control rod driving mechanism, which can limit the deflection of the moving armature under complex conditions such as tilting and swinging, reduce the wear of the moving parts of the moving hook, axially guide the moving armature, and ensure the reliable operation of the control rod driving mechanism.

To achieve the above object, the anti-deflection hook assembly of the present invention includes an upper end member, a lift armature, a moving armature, a hook, a holding pole, a holding armature, a hook support sleeve, a lower end member, a guide key, a quill and a buffer pipe shaft. The upper end component is fixedly sleeved at the upper end of the sleeve shaft, the lower end component is fixedly sleeved at the lower end of the sleeve shaft, and the holding magnetic pole is fixedly sleeved at the position, between the upper end component and the lower end component, of the sleeve shaft; the buffer pipe shaft is sleeved at the position, located between the upper end component and the holding magnetic pole, of the sleeve shaft in an axially sliding manner, the guide key is fixedly embedded at the side wall of the buffer pipe shaft, the lifting armature and the moving armature are sequentially sleeved on the buffer pipe shaft from the top to the bottom of the sleeve shaft in a sleeved manner, the lifting armature is also fixedly connected with the buffer pipe shaft, and the moving armature can axially slide on the buffer pipe shaft; the retaining armature and the hook claw supporting sleeve are sequentially sleeved on the sleeve shaft in an axially sliding manner from the top to the bottom of the sleeve shaft, and are also positioned between the retaining magnetic pole and the lower end member; the hook claw can be pivotally and swingably arranged on the buffer pipe shaft and is linked with the movable armature, the movable armature is linked with the hook claw to do pivotal swing motion in the axial sliding process relative to the buffer pipe shaft, one of the movable armature and the guide key is provided with an axial guide concave, the other one of the movable armature and the guide key is provided with an axial guide convex, the axial guide convex is embedded in the axial guide concave in a clearance fit manner, and the axial guide convex can also do axial sliding relative to the axial guide concave in the axial guide concave.

Preferably, the axial guide recess of the moving armature axially penetrates the moving armature in a direction close to the holding pole.

Preferably, a lateral through hole for communicating with the axial guide recess of the moving armature in the radial direction is formed in the side wall of the moving armature.

Preferably, the mating surface of the axial guiding convex for clearance fit with the axial guiding concave and/or the mating surface of the axial guiding concave for clearance fit with the axial guiding convex are plated with wear-resistant layers.

Preferably, the buffer tube shaft is provided with an embedding space radially penetrating through the side wall of the buffer tube shaft, and the guide key is positioned in the embedding space.

Preferably, the anti-deflection hook assembly further comprises a connecting rod positioned in the movable armature, one end of the connecting rod is hinged to the movable armature, the other end of the connecting rod is hinged to the hook, and an avoiding space for the hook to perform pivotal swing motion is formed in the side wall of the sleeve shaft.

Preferably, the guide key is a square block, and the axial guide protrusion is of a structure with a chamfer.

Preferably, the upper end member, the sleeve shaft and the lower end member together enclose an axial passage for the driving rod assembly in the control rod driving mechanism to axially penetrate and axially lift or lower, a radial position-limiting centering structure is formed on a passage wall of the axial passage, the radial position-limiting centering structure enables part of the axial passage to define a radial position-limiting centering passage for the driving rod assembly to penetrate and radially position and center the driving rod assembly, and the size of the radial position-limiting centering passage is smaller than that of the axial passage.

Preferably, the radial limiting and centering structure further enables a part of the axial channels to define one or more coolant axial flow passages for radially expanding the radial limiting and centering channels, and the plurality of coolant axial flow passages are arranged at intervals in the circumferential direction.

Preferably, the radial position-limiting centering structures are formed in channel walls of the axial channels at the upper and lower end members, respectively.

Preferably, a side wall of at least one of the upper end member and the lower end member is provided with a coolant lateral flow passage communicated with the coolant axial flow passage or the coolant axial channel, and the coolant lateral flow passage penetrates through the side wall.

Preferably, the coolant lateral flow channels and the coolant axial flow channels on the upper end member and/or the lower end member are each arranged radially in the circumferential direction.

Preferably, the upper end member is a lifting magnetic pole, or the upper end member is composed of a lifting magnetic pole and an upper expanding piece axially expanding and extending from the lifting magnetic pole; the lower end component is a lifting magnetic pole, or the lower end component consists of a positioning nut and a lower expansion piece axially extended from the positioning nut.

Preferably, the cross section of the radial position-limiting centering structure has a regular polygon shape, and the size of an inner circle where the regular polygon is located is smaller than that of the axial channel.

Preferably, the cross-section of the radial position-limiting centering structure has a contour in the shape of a flower, the contour including first circular arcs and second circular arcs having different curvatures and being alternately arranged to form a central symmetry together, all the first circular arcs circumscribing the contour of the cross-section of the radial position-limiting centering channel, and the second circular arcs circumscribing the contour of the cross-section of the coolant axial flow channel.

Preferably, the center of the first arc is located on a central symmetry line, the center of the second arc is staggered from the central symmetry line, the size of the profile of the cross section of the axial channel is larger than the diameter of the circle on which the first arc is located, and the size of the profile of the cross section of the axial channel is smaller than the diameter of the circle whose center is located on the central symmetry line and is tangent to the second arc.

In order to achieve the purpose, the control rod driving mechanism comprises an anti-deflection claw assembly, a rod position detector assembly, a pressure shell assembly, a driving rod assembly and a coil assembly. The rod position detector assembly is sleeved on a stroke sleeve in the pressure shell assembly, the driving rod assembly is installed in the sealing shell, the coil assembly is sleeved outside the sealing shell, the deflection-preventing claw assembly is sleeved in the sealing shell, and the driving rod assembly is further arranged in the deflection-preventing claw assembly in a penetrating mode and extends to the stroke sleeve.

Compared with the prior art, the anti-deflection hook claw assembly further comprises a buffer pipe shaft, the buffer pipe shaft is sleeved at the position, located between the upper end component and the holding magnetic pole, of the sleeve shaft in an axially slidable mode, the guide key is fixedly embedded in the side wall of the buffer pipe shaft, the lifting armature and the moving armature are sequentially sleeved on the buffer pipe shaft from the top to bottom direction of the sleeve shaft in a sleeved mode, the lifting armature is further fixedly connected with the buffer pipe shaft, and the moving armature can axially slide on the buffer pipe shaft; and then, one of the movable armature and the guide key is provided with an axial guide concave and the other is provided with an axial guide convex, the axial guide convex is embedded in the axial guide concave in a clearance fit manner, and the axial guide convex can also slide axially relative to the axial guide concave in the axial guide concave, so that under the action of the axial guide convex and the axial guide concave, the additional acting force generated by the movable armature on the hook under complex working conditions of swinging, tilting and the like can be transferred to the matching surfaces of the axial guide concave and the axial guide convex, the stress state of easily worn parts (such as the hook claw, a connecting rod and the like) in the deflection-proof hook component is improved, the abrasion of each contact surface of the easily worn parts is weakened, and the action reliability and the service life of the deflection-proof hook component are improved. Meanwhile, the axial guide concave and the axial guide convex are correspondingly designed on the original movable armature and the original guide key, so the structure is simple and compact, and the economical efficiency of manufacturing and processing is ensured. In addition, the axial guide convex and the axial guide concave are in clearance fit with each other, so that the axial movement of the movable armature can be realized, the deflection of the movable armature can be limited by setting fit tolerance, the principle is simple, and the realization is easy.

Drawings

FIG. 1 is a plan view, partially in section, of a control rod drive mechanism of the present invention.

FIG. 2 is a plan view, partially broken away in the middle, of an anti-yaw hook assembly in a control rod drive mechanism of the present invention.

FIG. 3 is a plan view, partially broken away, of an anti-yaw hook assembly in a control rod drive mechanism of the present invention at both the upper and lower ends.

Fig. 4 is a schematic view, partially in section, of the moving armature of the anti-yaw hook assembly in the crdm of the present invention, as viewed axially.

Fig. 5 is a schematic view of the structure of fig. 4 taken along the line B-B.

Fig. 6 is a partial schematic structural view viewed in the direction indicated by the arrow C in fig. 5.

FIG. 7 is a schematic plan view of the guide key of the anti-yaw hook assembly in the control rod drive mechanism of the present invention.

Fig. 8 is a schematic view of the internal structure of fig. 7 taken along line D-D.

Fig. 9 is a plan view, partially in section, of the upper end member of the anti-deflection finger assembly shown in fig. 3.

Fig. 10 is a schematic view of the internal structure of fig. 9 taken along line E-E.

FIG. 11 is a schematic diagram showing on FIG. 10 the profile of the cross-section of the circle on which the first arc lies, the circle tangent to the second arc, and the axial passage.

Fig. 12 is a plan view, partially in section, of the lower end member of the anti-deflection finger assembly shown in fig. 3.

Fig. 13 is a schematic view of the internal structure of fig. 12 taken along the line F-F.

Fig. 14 is a schematic view of the anti-deflection finger assembly of fig. 3 after deformation.

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 crdm 100 of the present invention includes an anti-deflection finger assembly 10, a rod position detector assembly 20, a pressure housing assembly 30, a drive rod assembly 40, and a coil assembly 50. The rod position detector assembly 20 is sleeved on a travel sleeve 31 in the pressure shell assembly 30 for providing an actual position signal of the drive rod assembly 40 when the control rod drive mechanism 100 of the present invention is in operation; the driving rod assembly 40 is installed in the sealing shell 32; the coil assembly 50 is sleeved outside the sealing shell 32 and used for providing power for the action of the deflection-preventing hook assembly 10; the anti-deflection claw assembly 10 is sleeved in the sealing shell 32 and used for realizing the functions of gripping, lifting and inserting the driving rod assembly 40, and the driving rod assembly 40 is further arranged in the anti-deflection claw assembly 10 in a penetrating way and extends to the stroke sleeve 31, so that the stroke sleeve 31 provides a movement stroke space for the driving rod assembly 40. Since the specific structures of the rod position detecting assembly 20, the pressure housing assembly 30, the driving rod assembly 40 and the coil assembly 50 are well known in the art, they will not be described in detail herein, and the anti-deflection finger assembly 10 will be described in detail below.

Referring to fig. 2 and 3, the anti-deflection hook assembly 10 includes an upper end member 11a, a lift armature 11b, a moving armature 11c, a hook 11d, a holding pole 12, a holding armature 13, a hook support sleeve 14, a lower end member 15, a pilot key 16, a quill 17, and a buffer tube shaft 18. The upper end member 11a is fixedly sleeved on the upper end of the quill 17, and is fixed to the upper end of the quill 17 by welding or screwing, for example, but not limited thereto; the lower end member 15 is fixedly sleeved on the lower end of the quill 17, and is fixed to the lower end of the quill 17 by welding, screwing or the like, but not limited thereto; the holding magnetic pole 12 is fixedly sleeved on the sleeve shaft 17 at a position between the upper end member 11a and the lower end member 15, and is fixed with the sleeve shaft 17 by welding, screwing or the like, but not limited thereto; the buffer tube shaft 18 is sleeved at the position of the sleeve shaft 17 between the upper end component 11a and the holding magnetic pole 12 in an axially sliding manner, and the guide key 16 is fixedly embedded at the side wall of the buffer tube shaft 18, so that the guide key 16 can follow the buffer tube shaft 18 to perform axial movement sliding on the sleeve shaft 17; the lifting armature 11b and the moving armature 11c are sequentially sleeved on the buffer pipe shaft 18 from the upper to the lower direction of the sleeve shaft 17 (namely the direction indicated by the arrow A), and the lifting armature 11b is fixedly connected with the buffer pipe shaft 18, so that the lifting armature 11b and the buffer pipe shaft 18 are fixed together; the movable armature 11c can axially slide on the buffer pipe shaft 18, so that the movable armature 11c can axially slide relative to the buffer pipe shaft 18; the retaining armature 13 and the hook supporting sleeve 14 are sequentially sleeved on the sleeve shaft 17 in an axially slidable manner from the top to the bottom of the sleeve shaft 17, and the retaining armature 13 and the hook supporting sleeve 14 are also positioned between the retaining magnetic pole 12 and the lower end member 15; the hook 11d is pivotally and swingably mounted on the buffer pipe shaft 18 and linked with the movable armature 11c, and the movable armature 11c links the hook 11d to make pivotal and swinging movement in the process of axially sliding relative to the buffer pipe shaft 18, so that the hook 11d is engaged with or disengaged from the driving rod assembly 40; the movable armature 11c is provided with an axial guide recess 111, the guide key 16 is provided with an axial guide projection 161, the axial guide projection 161 is embedded in the axial guide recess 111 in a clearance fit manner, and the axial guide projection 161 can also slide axially in the axial guide recess 111 relative to the axial guide recess 111. It will be appreciated that, according to practical requirements, the axial guiding projection 161 can be provided by the moving armature 11c, and correspondingly, the axial guiding recess 111 is opened by the guiding key 16, which can also achieve the purpose of preventing the moving armature 11c from deflecting in the circumferential direction during the axial sliding process. More specifically, the following:

as shown in fig. 2, in order to make the moving armature 11c more reliably interlock with the hook 11d, the anti-deflection hook assembly 10 further includes a connecting rod 11e located in the moving armature 11c, one end of the connecting rod 11e is hinged to the moving armature 11c, the other end of the connecting rod 11e is hinged to the hook 11d, and a side wall of the sleeve shaft 17 is opened with an escape space 171 for the hook 11d to perform a pivotal movement.

As shown in fig. 5 and 6, the axial guide recess 111 of the moving armature 11c axially penetrates the moving armature 11c in a direction approaching the holding magnetic pole 12 (also in a direction indicated by an arrow a) to improve the convenience of the operation of fitting the axial guide projection 161 into the axial guide recess 111 or taking it out from the axial guide recess 111. Specifically, a lateral through hole 112 is formed in a side wall of the moving armature 11c for communicating with the axial guide recess 111 of the moving armature 11c in a radial direction, so as to facilitate assembly and observation of the guide key 16. More specifically, in fig. 4 and 8, the mating surface 1611 of the axial guide projection 161 for clearance fit with the axial guide recess 111 and the mating surface 1111 of the axial guide recess 111 for clearance fit with the axial guide projection 161 are each coated with a wear-resistant layer, such as, but not limited to, a chromium layer, which both improves the wear resistance of the mating surfaces 1111(1611) and reduces the frictional resistance of the guiding process. It is understood that, according to practical requirements, the mating surface 1611 of the axial guiding protrusion 161 for clearance fit with the axial guiding recess 111 or the mating surface 1111 of the axial guiding recess 111 for clearance fit with the axial guiding protrusion 161 may be coated with a wear resistant layer, and therefore, the present invention is not limited thereto. In order to meet the installation requirement of the guide key 16, in fig. 2, the buffer tube shaft 18 is provided with an embedding space 181 radially penetrating through the side wall of the buffer tube shaft 18, and the guide key 16 is located in the embedding space 181. To make the structure of the guide key 16 simpler, the guide key 16 is a square block, and the axial guide projection 161 is a chamfered structure 1612 to reduce frictional resistance between the axial guide projection 161 and the axial guide recess 111.

As shown in fig. 3, the upper end member 11a, the sleeve shaft 17 and the lower end member 15 together define an axial passage 19a for the driving rod assembly 40 to axially penetrate and axially lift or lower, a channel wall 191 of the axial passage 19a is formed with a radial position-limiting centering structure 19b, the radial position-limiting centering structure 19b enables a part of the axial passage 19a to define a radial position-limiting centering channel 19C for the driving rod assembly 40 to penetrate and radially position-limiting centering the driving rod assembly 40, the size of the radial position-limiting centering channel 19C is smaller than that of the axial passage 19a, which can be seen in the relationship between C1 and C2 in fig. 11 in detail; the radial limiting centering channel 19c is used for limiting the shaking of the driving rod assembly 40 of the control rod driving mechanism 100 under the complex working conditions of tilting, swinging and the like, the shaking and tilting amplitude of the driving rod assembly 40 under the complex working conditions of tilting, swinging and the like is reduced, accordingly, the impact of the driving rod assembly 40 on the deflection-preventing hook assembly 10 and the extra additional force generated on the deflection-preventing hook assembly 10 are reduced, the service life of the deflection-preventing hook assembly 10 is prolonged, and the action reliability of the control rod driving mechanism 100 is effectively ensured; meanwhile, the limit centering of the driving rod assembly 40 during rod falling can be guaranteed, and the friction resistance is reduced, so that the control rod can be smoothly inserted into the reactor core under complex working conditions of swinging, inclining and the like, and the reactor can be safely shut down. In addition, the radial position limiting and centering structure 19b is easy to realize, and economical manufacturing and processing are guaranteed.

As shown in fig. 3, the radial position-limiting centering structures 19b are respectively formed on the channel walls 191 of the axial channels 19a of the upper end member 11a and the lower end member 15, and preferably, the radial position-limiting centering structures 19b on the upper end member 11a and the radial position-limiting centering structures 19b on the lower end member 15 are concentric (i.e., the center lines of the two are coincident) so that a pair of radial position-limiting centering structures 19b are distributed at two ends of the anti-deflection claw assembly 10, thereby ensuring the distance between two centering points, more reliably generating a significant position-limiting centering effect on the elongated driving rod assembly 40, and further ensuring the centering; of course, the radial position-limiting centering structure 19b can also be formed on the channel wall 191 of the axial channel 19a at other parts in the anti-deflection finger assembly 10 according to actual needs, and therefore, is not limited thereto. For example, in fig. 3, the upper end member 11a is a lifting pole, and the lower end member 15 is a positioning nut; of course, according to actual needs, as shown in fig. 14, in other embodiments, the upper end member 11a 'may be composed of a lifting pole 11a1 and an upper expanding piece 11a2 extending axially from the lifting pole 11a1, and the radial position-limiting centering structure 19b at the upper end member 11 a' is preferably located on the upper expanding piece 11a 2; similarly, the lower end member may be composed of a positioning nut and a lower expanding member extending axially from the positioning nut, and the radial position-limiting centering structure 19b at the lower end member is preferably located on the lower expanding member, so that the above description is not limited.

As shown in fig. 3, 9, 10, 12 and 13, the radial positioning and centering structure 19b further defines a part of the axial channels 19a with coolant axial flow channels 19e for radially expanding the radial positioning and centering channels 19c, preferably, four coolant axial flow channels 19e are arranged at intervals in the circumferential direction, so as to provide channels for the axial flow of the coolant by means of the coolant axial flow channels 19e, so as to reduce the flow resistance of the driving rod assembly 40, thereby effectively shortening the rod dropping time. Specifically, in fig. 3, 9, 10, 12 and 13, the side wall 111a (151) of both the upper end member 11a and the lower end member 15 is opened with a coolant lateral flow channel 19d communicated with the coolant axial flow channel 19e, and the coolant lateral flow channel 19d penetrates through the side wall 111a (151) to provide a passage for the lateral flow of the coolant through the coolant lateral flow channel 19d, thereby further reducing the flow resistance of the driving rod assembly 40, and thus further shortening the rod drop time. Preferably, the coolant lateral flow channels 19d and the coolant axial flow channels 19e of the upper end member 11a and the lower end member 15 are respectively arranged in a radial manner in the circumferential direction (referring to the circumferential direction of the anti-deflection hook assembly 10), so as to achieve the purpose of better reducing the flow resistance of the driving rod assembly 40. It will be appreciated that the coolant axial flow channels 19e may be one, two, three or five, which are flexibly selected according to the actual needs; the coolant lateral flow path 19d may be formed by the side wall 111a of the upper end member 11a or the side wall 151 of the lower end member 15; further, the coolant lateral flow passage 19d may be provided so as to communicate with the axial passage 19a and not communicate with the coolant axial flow passage 19e, and therefore, the above description is not intended to be limiting.

As shown in fig. 10 to 11, in the upper end member 11a, the cross-sectional profile of the radial position-limiting centering structure 19b is a flower-shaped profile including first circular arcs 192 and second circular arcs 193 having different curvatures and alternately arranged to form a central symmetry together, preferably, the first circular arcs 192 have a smaller curvature than the second circular arcs 193 such that the radius of the first circular arcs 192 is larger than the radius of the second circular arcs 193; all the first arcs 192 enclose the cross-sectional profile of the radial position-limiting centering channel 19c and the second arcs 192 enclose the cross-sectional profile of the coolant axial flow channel 19e, so that the radial position-limiting centering structure 19b is compact, simple and easy to implement, and the economy of manufacturing and processing is ensured. Specifically, in fig. 10 to 11, the center of the first circular arc 192 is located on the central symmetry line L, the center P1 of the second circular arc 193 is offset from the central symmetry line L, the size of the cross-sectional profile C2 of the axial channel 19a is larger than the diameter of the circle C1 of the first circular arc 192, and the size of the cross-sectional profile C2 of the axial channel 19a is smaller than the diameter of the circle C3 whose center is located on the central symmetry line L and is tangent to the second circular arc 193, so as to further make the radial limiting and centering structure 19b compact, simple and easy to implement, and ensure the economy of manufacturing and processing. Similarly, in fig. 12 and 13, the cross-sectional profile of the radial position-limiting centering structure 19b of the lower end member 15 is also a flower-shaped profile, and the specific structure of the flower-shaped profile is the same as that of the upper end member 11a, so that the detailed description thereof is omitted. It will be appreciated that in other embodiments, the cross-section of the radial position-limiting centering structure 19b is also a regular polygon, and the size of the inner circle of the regular polygon is smaller than that of the axial channel 19a, which can also achieve the purpose of radial position-limiting centering of the driving rod assembly 40.

Compared with the prior art, the anti-deflection hook assembly 10 further comprises a buffer pipe shaft 18, the buffer pipe shaft 18 is sleeved at the position, located between the upper end component 11a and the holding magnetic pole 12, of the sleeve shaft 17 in an axially slidable manner, the guide key 16 is fixedly embedded at the side wall of the buffer pipe shaft 18, the lifting armature 11b and the moving armature 11c are sequentially sleeved on the buffer pipe shaft 18 from the top to the bottom direction of the sleeve shaft 17, the lifting armature 11b is also fixedly connected with the buffer pipe shaft 18, and the moving armature 11c can axially slide on the buffer pipe shaft 18; in combination with that one of the movable armature 11c and the guide key 13 is provided with the axial guide recess 111 and the other is provided with the axial guide protrusion 161, the axial guide protrusion 161 is embedded in the axial guide recess 111 in a clearance fit manner, and the axial guide protrusion 161 can also slide axially relative to the axial guide recess 111 in the axial guide recess 111, so that under the action of the axial guide protrusion 161 and the axial guide recess 111, an additional acting force generated by the movable armature 11c on the hook claw 11d under complex conditions such as swinging and tilting can be transferred to the matching surfaces 1111(1611) of the axial guide recess 111 and the axial guide protrusion 161, the stress state of easily worn parts (such as a hook claw, a connecting rod and the like) in the anti-deflection hook assembly 10 is improved, the abrasion of the contact surfaces of the easily worn parts is reduced, and the action reliability and the service life of the anti-deflection hook assembly 10 are improved. Meanwhile, the axial guide concave 111 and the axial guide convex 161 are correspondingly designed on the original moving armature 11c and the guide key 16, so the structure is simple and compact, and the economical efficiency of manufacturing and processing is ensured. Moreover, the axial guide projection 161 and the axial guide recess 111 are in clearance fit with each other, so that not only can the axial movement of the moving armature 11c be realized, but also the deflection amount of the moving armature can be limited by setting fit tolerance, and the principle is simple and easy to realize.

It should be noted that the control rod drive mechanism 100 of the present invention is mounted vertically on the top head of the reactor pressure vessel when in use. Further, quill 17 and damper shaft 18 are referred to as hollow shaft members, however, as is well known in the art. Furthermore, in fig. 11, C1 (i.e., the inner circle) represents the circle C1 on which the first arc 192 is located, and is also the circle on which the profile of the cross-section of the radial centering channel 19C is located; c3 (i.e., the outer circle) represents a circle having a center on the central symmetry line L and tangent to the second circular arc 193, and is also a circle on which the cross-sectional profile of the coolant axial flow passage 19e is located; c2 (i.e., the middle circle) represents the cross-sectional profile of the axial passage 19 a.

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.