A support member and a drive mechanism nozzle structure for a pressurized water reactor nuclear power plant

Abstract

The present invention discloses a support member and a drive mechanism nozzle structure for a pressurized water reactor nuclear power plant. The support member includes a hollow ring body for being embedded in the drive mechanism nozzle and allowing a heat supply sleeve to pass through. Among them, a connecting portion for being connected to the drive mechanism nozzle and restricting relative movement in the axial and radial directions is provided at the first end of the hollow ring body in the axial direction; the inner wall surface at the second end of the hollow ring body in the axial direction is a conical surface for supporting the heat sleeve. By means of this support member, it can be ensured that the heat sleeve no longer causes wear to the drive mechanism nozzle body, improve the overall wear life of the drive mechanism nozzle, reduce or eliminate the operation and maintenance requirements of the drive mechanism nozzle, and improve the safety and economy of the unit. Moreover, the support member has the advantages of long life, wear resistance, and replaceability. After excessive wear occurs to the support member, it can be disassembled and replaced, without affecting the integrity of the pressure-bearing structure of the nozzle.

Description

Technical Field

[0001] The present invention relates to the technical field of the drive mechanism nozzle of a pressurized water reactor nuclear power plant, and particularly relates to a support member and a drive mechanism nozzle structure of a pressurized water reactor nuclear power plant. Background Art

[0002] As Figure 1 shown, the existing drive mechanism nozzle 2' is located on the top cover 1 of the pressure vessel and is used to support the drive rod 4 and the thermal sleeve 3. As Figure 2 、 3 and 4 show, the thermal sleeve 3 is inside the existing drive mechanism nozzle 2' and relies on its own weight to sit on the conical step surface 21' of the nozzle. Under the action of the in-core fluid, wear occurs, including the thermal sleeve flange 31 and the conical step surface 21' of the nozzle. In severe cases, this wear can cause the thermal sleeve flange 31 to separate from the thermal sleeve 3, forming foreign objects inside the existing drive mechanism nozzle 2' that affect the movement of the drive rod 4, resulting in jamming of the drive rod 4; at the same time, the wear causes the conical step surface 21' of the nozzle to form depressions, resulting in continuous wear of the existing drive mechanism nozzle 2' after installing a new thermal sleeve 3, and ultimately causing the existing drive mechanism nozzle 2' to lose its pressure boundary function.

[0003] Currently, the first common method is to remove the significantly worn thermal sleeve and install a new thermal sleeve on the worn drive mechanism nozzle 2 without treating the worn drive mechanism nozzle. This will cause the drive mechanism nozzle to continue to wear, and it cannot be guaranteed that the remaining life of the drive mechanism nozzle after installing the new thermal sleeve can meet the operation requirements of the nuclear power plant throughout its entire life cycle.

[0004] The second is to use an integrated drive mechanism nozzle. Since no wear-resistant strengthening is carried out on local positions and the wear-resistant performance of the material used for the drive mechanism nozzle is poor, the life of the drive mechanism nozzle after wear cannot meet the operation requirements of the nuclear power plant throughout its entire life cycle. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a support member and a drive mechanism nozzle structure of a pressurized water reactor nuclear power plant in view of at least one defect existing in the related technologies mentioned in the above background art: no wear-resistant strengthening is carried out on the drive mechanism nozzle, and the life of the drive mechanism nozzle after wear cannot meet the operation requirements of the nuclear power plant throughout its entire life cycle.

[0006] The technical solution adopted by the present invention to solve its technical problems is to construct a support member, including a hollow ring body for being embedded in the drive mechanism nozzle and allowing the thermal sleeve to pass through;

[0007] wherein, a connection portion for connecting with the drive mechanism nozzle and restricting relative movement in the axial and radial directions is provided at the first end of the hollow ring body in the axial direction;

[0008] The inner wall surface of the second end of the hollow ring body in the axial direction is a conical surface for supporting the thermal sleeve.

[0009] Preferably, in the support member of the present invention, a disassembly and assembly portion for disassembly or installation is provided on the inner wall surface of the hollow ring body.

[0010] Preferably, in the support member of the present invention, the disassembly and assembly portion is a first annular groove for clamping.

[0011] Preferably, in the support member of the present invention, the flanges at both ends of the first annular groove in the axial direction are respectively first chamfers.

[0012] Preferably, in the support member of the present invention, the hollow ring body or the conical surface is made of a material with better wear resistance than the drive mechanism socket.

[0013] Preferably, in the support member of the present invention, the connecting portion is an annular elastic clamping portion that extends axially from the end face of the first end of the hollow ring body and forms a step with the end face of the first end.

[0014] Preferably, in the support member of the present invention, the clamping portion is a lip structure.

[0015] Preferably, in the support member of the present invention, at least two grooves opening from the second end to the first end of the hollow ring body are provided in the circumferential direction of the clamping portion.

[0016] Preferably, in the support member of the present invention, the connecting portion is a second chamfer for welding provided on the inner peripheral edge of the end face of the first end of the hollow ring body.

[0017] Preferably, in the support member of the present invention, the connecting portion is a second annular groove for welding provided on the inner wall surface of the first end of the hollow ring body.

[0018] Preferably, in the support member of the present invention, the connecting portion is a third annular groove for welding provided on the end face of the first end of the hollow ring body.

[0019] Preferably, in the support member of the present invention, a first step is provided on the inner wall surface of the first end of the hollow ring body, and the inner diameter of the first step is greater than the inner diameter of the hollow ring body.

[0020] The present invention also constructs a drive mechanism socket structure for a pressurized water reactor nuclear power plant, including a drive mechanism socket and the support member according to any one of the above;

[0021] The hollow ring body is embedded in the drive mechanism socket, and a connected portion that cooperates with the connecting portion is provided on the drive mechanism socket.

[0022] Preferably, in the drive mechanism nozzle structure of the pressurized water reactor nuclear power plant described in the present invention, an inner wall surface at the top of the drive mechanism nozzle is provided with a second step, and an inner diameter at the second step is larger than an inner diameter of the drive mechanism nozzle;

[0023] The hollow ring body is embedded in the drive mechanism nozzle, an outer diameter of the hollow ring body is substantially the same as the inner diameter at the second step, an inner diameter of the hollow ring body is the same as the inner diameter of the drive mechanism nozzle, and an end face of a first end of the hollow ring body abuts against a plane of the second step;

[0024] The connected part is arranged on the second step or on an inner wall surface where the inner diameter of the drive mechanism nozzle is located.

[0025] The present invention also constructs a drive mechanism nozzle structure of a pressurized water reactor nuclear power plant, including a drive mechanism nozzle and the support member described above;

[0026] The hollow ring body and the clamping part are embedded in the drive mechanism nozzle, and a fourth annular groove for cooperating with the clamping part to perform clamping is arranged on the drive mechanism nozzle.

[0027] Preferably, in the drive mechanism nozzle structure of the pressurized water reactor nuclear power plant described in the present invention, an inner wall surface at the top of the drive mechanism nozzle is provided with a second step, and an inner diameter at the second step is larger than an inner diameter of the drive mechanism nozzle;

[0028] The hollow ring body is embedded in the drive mechanism nozzle, an outer diameter of the hollow ring body is substantially the same as the inner diameter at the second step, an end face of a first end of the hollow ring body abuts against the plane of the second step, and an inner diameter of the clamping part is the same as the inner diameter of the drive mechanism nozzle;

[0029] The fourth annular groove is arranged on an inner wall surface where the inner diameter of the drive mechanism nozzle is located.

[0030] Preferably, in the drive mechanism nozzle structure of the pressurized water reactor nuclear power plant described in the present invention, an outer diameter of a lip of the clamping part is larger than an outer diameter of a flange of the fourth annular groove.

[0031] The present invention also constructs a drive mechanism nozzle structure of a pressurized water reactor nuclear power plant, including a drive mechanism nozzle and the support member described above;

[0032] The hollow ring body is embedded in the drive mechanism nozzle, a third chamfer is arranged on the drive mechanism nozzle, and the third chamfer and the second chamfer are used for welding.

[0033] Preferably, in the drive mechanism nozzle structure of the pressurized water reactor nuclear power plant according to the present invention, the inner wall surface at the top of the drive mechanism nozzle is provided with a second step, and the inner diameter at the second step is larger than the inner diameter of the drive mechanism nozzle;

[0034] The hollow ring is embedded in the drive mechanism nozzle. The outer diameter of the hollow ring is substantially the same as the inner diameter at the second step, and the inner diameter of the hollow ring is the same as the inner diameter of the drive mechanism nozzle. Moreover, the end face of the first end of the hollow ring abuts against the plane of the second step;

[0035] The third chamfer is provided at the edge of the second step.

[0036] The present invention also constructs a drive mechanism nozzle structure of a pressurized water reactor nuclear power plant, which includes a drive mechanism nozzle and the support member described above;

[0037] The hollow ring is embedded in the drive mechanism nozzle. A fifth ring groove is provided on the drive mechanism nozzle, and the fifth ring groove and the second ring groove are used for welding.

[0038] Preferably, in the drive mechanism nozzle structure of the pressurized water reactor nuclear power plant according to the present invention, the inner wall surface at the top of the drive mechanism nozzle is provided with a second step, and the inner diameter at the second step is larger than the inner diameter of the drive mechanism nozzle;

[0039] The hollow ring is embedded in the drive mechanism nozzle. The outer diameter of the hollow ring is substantially the same as the inner diameter at the second step, and the inner diameter of the hollow ring is the same as the inner diameter of the drive mechanism nozzle. Moreover, the end face of the first end of the hollow ring abuts against the plane of the second step;

[0040] The fifth ring groove is provided on the inner wall surface where the inner diameter of the drive mechanism nozzle is located.

[0041] The present invention also constructs a drive mechanism nozzle structure of a pressurized water reactor nuclear power plant, which includes a drive mechanism nozzle and the support member described above;

[0042] The hollow ring is embedded in the drive mechanism nozzle. A sixth ring groove corresponding to the third ring groove is provided on the drive mechanism nozzle, and the sixth ring groove and the third ring groove are used for welding.

[0043] Preferably, in the drive mechanism nozzle structure of the pressurized water reactor nuclear power plant according to the present invention, the inner wall surface at the top of the drive mechanism nozzle is provided with a second step, and the inner diameter at the second step is larger than the inner diameter of the drive mechanism nozzle;

[0044] The hollow ring body is embedded in the seat of the driving mechanism. The outer diameter of the hollow ring body is substantially the same as the inner diameter at the second step, and the inner diameter of the hollow ring body is the same as the inner diameter of the seat of the driving mechanism. Moreover, the end face of the first end of the hollow ring body abuts against the plane of the second step;

[0045] The sixth annular groove is provided on the plane of the second step.

[0046] Preferably, in the seat structure of the driving mechanism of the pressurized water reactor nuclear power plant of the present invention, a third step is provided on the inner wall surface where the inner diameter of the seat of the driving mechanism is located, and the third step and the first step on the inner wall surface of the first end of the hollow ring body form a seventh annular groove;

[0047] The inner diameter of the seventh annular groove is larger than the inner diameter of the seat of the driving mechanism.

[0048] By implementing the present invention, the following beneficial effects are achieved:

[0049] The present invention discloses a support member, which includes a hollow ring body for being embedded in the seat of the driving mechanism and allowing a heat sleeve to pass through. The hollow ring body and the two components of the seat of the driving mechanism are connected through necessary mechanical connection or welding to form an integral body with sufficient strength. Among them, the seat of the driving mechanism undertakes the pressure boundary function, and the hollow ring body undertakes the heat sleeve support function and the wear resistance function, ensuring that the heat sleeve no longer causes wear to the body of the seat of the driving mechanism, improving the overall wear life of the seat of the driving mechanism, reducing or canceling the operation and maintenance requirements of the seat of the driving mechanism, and improving the safety and economy of the unit.

[0050] Moreover, the support member has the advantages of long life, wear resistance, and replaceability. After excessive wear occurs to the support member, it can be disassembled and replaced, without affecting the integrity of the pressure-bearing structure of the seat.

[0051] In addition, the support member can be used in operating power plants and power plants under construction. Adopting the support member solution for repairing in-service units can ensure that the structure is restored to the original design and avoid affecting the function of the drive line. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0053] Figure 1 is a schematic diagram of a typical reactor pressure vessel structure;

[0054] Figure 2 is a schematic diagram of the existing seat structure of the driving mechanism;

[0055] Figure 3 is a schematic diagram of the existing seat of the driving mechanism, heat sleeve and driving rod;

[0056] Figure 4 It is a schematic diagram of the wear of the existing drive mechanism socket;

[0057] Figure 5 It is a schematic structural diagram of the support member in the third embodiment of the present invention;

[0058] Figure 6 It is an exploded sectional structural diagram of the support member and the drive mechanism socket in the fourth embodiment of the present invention;

[0059] Figure 7 It is a schematic structural diagram of the installed support member and the drive mechanism socket in the fourth embodiment of the present invention;

[0060] Figure 8 It is a schematic structural diagram of the lip and the flange of the fourth annular groove after installation in the fourth embodiment of the present invention;

[0061] Figure 9 It is a schematic structural diagram of the support member in the fifth embodiment of the present invention;

[0062] Figure 10 It is an exploded sectional structural diagram of the support member and the drive mechanism socket in the sixth embodiment of the present invention;

[0063] Figure 11 It is a schematic structural diagram of the installed support member and the drive mechanism socket in the sixth embodiment of the present invention;

[0064] Figure 12 It is a schematic structural diagram of the support member in the seventh embodiment of the present invention;

[0065] Figure 13 It is an exploded sectional structural diagram of the support member and the drive mechanism socket in the eighth embodiment of the present invention;

[0066] Figure 14 It is a schematic structural diagram of the installed support member and the drive mechanism socket in the eighth embodiment of the present invention;

[0067] Figure 15 It is a schematic structural diagram of the support member in the ninth embodiment of the present invention;

[0068] Figure 16 It is an exploded sectional structural diagram of the support member and the drive mechanism socket in the tenth embodiment of the present invention;

[0069] Figure 17 It is a schematic structural diagram of the installed support member and the drive mechanism socket in the tenth embodiment of the present invention. Detailed implementation manners

[0070] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0071] It should be noted that the flowcharts shown in the accompanying drawings are only illustrative, and do not necessarily include all contents and operations / steps, nor are they necessarily executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0072] The block diagrams shown in the accompanying drawings are only functional entities, and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0073] In a first embodiment, the present invention discloses a support member, including a hollow ring body 5 for being embedded in a drive mechanism socket 2 and for a heat supply sleeve 3 to pass through.

[0074] Wherein, a first end A of the hollow ring body 5 in the axial direction is provided with a connecting portion for connecting with the drive mechanism socket 2 and restricting relative movement in the axial and radial directions. The inner wall surface of the second end B of the hollow ring body 5 in the axial direction is a tapered surface 52 for supporting the heat sleeve 3.

[0075] In this embodiment, since the entire hollow ring body 5 is embedded in the drive mechanism socket 2, in order to facilitate disassembly and installation, a disassembly and installation portion 53 for disassembly or installation is provided on the inner wall surface of the hollow ring body 5. Preferably, the disassembly and installation portion 53 is arranged closer to the first end A than the second end B of the hollow ring body 5.

[0076] For example, the disassembly and installation portion 53 is a first annular groove for clamping, and the flanges at both ends of the first annular groove in the axial direction are respectively first chamfers 531.

[0077] In addition, since the hollow ring body 5 is used to support the heat sleeve 3 and rubs against the heat sleeve 3, the material of the hollow ring body 5 is the same as that of the drive mechanism socket 2, or the entire hollow ring body 5 or at least the tapered surface 52 is made of a material with better wear resistance than the drive mechanism socket 2, having higher wear resistance to the heat sleeve 3, which can significantly improve the service life of the drive mechanism socket 2, reduce or cancel the operation and maintenance requirements of the drive mechanism socket 2, and improve the safety and economy of the unit.

[0078] In a second embodiment, the present invention discloses a drive mechanism socket structure of a pressurized water reactor nuclear power plant, including a drive mechanism socket 2 and the support member described in the above first embodiment, which will not be elaborated here. Wherein, the hollow ring body 5 is embedded in the drive mechanism socket 2, and a connected portion for cooperating with the connecting portion is provided on the drive mechanism socket 2.

[0079] In this embodiment, the inner wall surface at the top of the drive mechanism socket 2 is provided with a second step 21, and the inner diameter at the second step 21 is larger than the inner diameter of the drive mechanism socket 2.

[0080] The hollow ring body 5 is embedded in the drive mechanism socket 2. The outer diameter of the hollow ring body 5 is substantially the same as the inner diameter at the second step 21. For example, a small clearance fit or a slight interference fit is adopted to ensure that the hollow ring body 5 does not move significantly laterally within the drive mechanism socket 2. Moreover, the inner diameter of the hollow ring body 5 is the same as the inner diameter of the drive mechanism socket 2, and the end face of the first end A of the hollow ring body 5 abuts against the plane of the second step 21.

[0081] The connected part is arranged on the second step 21 or on the inner wall surface where the inner diameter of the drive mechanism socket 2 is located.

[0082] The third embodiment is as Figure 5 and 6 shown. The present invention discloses a support member, including the content of the above-mentioned first embodiment, which will not be elaborated here. Among them, the connecting part is an annular elastic clamping part 51 that extends axially from the end face of the first end A of the hollow ring body 5 and forms a step with the end face of the first end A.

[0083] In this embodiment, the clamping part 51 is a lip structure, and the inner diameter of the clamping part 51 is the same as the inner diameter of the hollow ring body 5.

[0084] Moreover, in order to ensure the smooth installation of the lip, at least two grooves 512 that open from the second end B of the hollow ring body 5 towards the first end A are provided in the circumferential direction of the clamping part 51. Preferably, it includes a plurality of grooves 512, and the plurality of grooves 512 are evenly spaced in the circumferential direction of the connecting part.

[0085] The fourth embodiment is as Figures 6 to 8 shown. The present invention discloses a drive mechanism socket structure of a pressurized water reactor nuclear power plant, including a drive mechanism socket 2 and the support member described in the above-mentioned third embodiment, which will not be elaborated here. Among them, the hollow ring body 5 and the clamping part 51 are embedded in the drive mechanism socket 2, and the drive mechanism socket 2 is provided with a fourth annular groove 22 that cooperates with the clamping part 51 for clamping.

[0086] In this embodiment, the inner wall surface at the top of the drive mechanism socket 2 is provided with a second step 21, and the inner diameter at the second step 21 is larger than the inner diameter of the drive mechanism socket 2.

[0087] The hollow ring body 5 is embedded in the seat 2 of the driving mechanism. The outer diameter of the hollow ring body 5 is basically the same as the inner diameter at the second step 21. For example, a small clearance fit or a slight interference fit is adopted to ensure that the hollow ring body 5 does not move significantly laterally in the seat 2 of the driving mechanism. Moreover, the end face of the first end A of the hollow ring body 5 abuts against the plane of the second step 21, and the inner diameter of the clamping portion 51 is the same as the inner diameter of the seat 2 of the driving mechanism. The fourth annular groove 22 is provided on the inner wall surface where the inner diameter of the seat 2 of the driving mechanism is located.

[0088] In this embodiment, to ensure that the lip 511 of the clamping portion 51 does not loosen after being inserted into the fourth annular groove 22, the outer diameter of the lip 511 of the clamping portion 51 is greater than the outer diameter of the flange of the fourth annular groove 22.

[0089] The fifth embodiment, as Figure 9 and 10 shown, the present invention discloses a support member, including the content of the above-mentioned first embodiment, which will not be elaborated here. Among them, the connecting portion is a second chamfer 54 provided on the inner peripheral edge of the end face of the first end A of the hollow ring body 5 for welding.

[0090] The sixth embodiment, as Figure 10 and 11 shown, the present invention discloses a seat structure of a driving mechanism for a pressurized water reactor nuclear power plant, including the seat 2 of the driving mechanism and the support member described in the above-mentioned fifth embodiment, which will not be elaborated here. Among them, the hollow ring body 5 is embedded in the seat 2 of the driving mechanism, and the seat 2 of the driving mechanism is provided with a third chamfer 23. The third chamfer 23 and the second chamfer 54 are used for welding. For example, a fillet welding or autogenous welding process is adopted for spot welding and anti-loosening.

[0091] In this embodiment, the inner wall surface at the top of the seat 2 of the driving mechanism is provided with a second step 21, and the inner diameter at the second step 21 is greater than the inner diameter of the seat 2 of the driving mechanism.

[0092] The hollow ring body 5 is embedded in the seat 2 of the driving mechanism. The outer diameter of the hollow ring body 5 is basically the same as the inner diameter at the second step 21. For example, a small clearance fit or a slight interference fit is adopted to ensure that the hollow ring body 5 does not move significantly laterally in the seat 2 of the driving mechanism. Moreover, the inner diameter of the hollow ring body 5 is the same as the inner diameter of the seat 2 of the driving mechanism, and the end face of the first end A of the hollow ring body 5 abuts against the plane of the second step 21. The third chamfer 23 is provided at the edge of the second step 21.

[0093] The seventh embodiment, as Figure 12 and 13 shown, the present invention discloses a support member, including the content of the above-mentioned first embodiment, which will not be elaborated here. Among them, the connecting portion is a second annular groove 55 provided on the inner wall surface of the first end A of the hollow ring body 5 for welding.

[0094] The eighth embodiment, asFigure 13 and 14 As shown in 14 , the present invention discloses a drive mechanism nozzle structure for a pressurized water reactor nuclear power plant, which includes a drive mechanism nozzle 2 and the support member described in the seventh embodiment above, and will not be elaborated here. Among them, the hollow ring body 5 is embedded in the drive mechanism nozzle 2, and a fifth ring groove 24 is provided on the drive mechanism nozzle 2. The fifth ring groove 24 and the second ring groove 55 are used for welding, for example, continuous or intermittent welding and anti-loosening are carried out by using a self-fusion process.

[0095] In this embodiment, the inner wall surface at the top of the drive mechanism nozzle 2 is provided with a second step 21, and the inner diameter at the second step 21 is greater than the inner diameter of the drive mechanism nozzle 2.

[0096] The hollow ring body 5 is embedded in the drive mechanism nozzle 2. The outer diameter of the hollow ring body 5 is substantially the same as the inner diameter at the second step 21. For example, a small clearance fit or a slight interference fit is adopted to ensure that the hollow ring body 5 does not move significantly laterally in the drive mechanism nozzle 2. Moreover, the inner diameter of the hollow ring body 5 is the same as the inner diameter of the drive mechanism nozzle 2, and the end face of the first end A of the hollow ring body 5 abuts against the plane of the second step 21. The fifth ring groove 24 is provided on the inner wall surface where the inner diameter of the drive mechanism nozzle 2 is located.

[0097] Ninth embodiment, as Figure 15 and 16 As shown in 16 , the present invention discloses a support member, which includes the content of the first embodiment above and will not be elaborated here. Among them, the connecting portion is a third ring groove 56 provided on the end face of the first end A of the hollow ring body 5 for welding.

[0098] In this embodiment, the inner wall surface of the first end A of the hollow ring body 5 is provided with a first step 57, and the inner diameter of the first step 57 is greater than the inner diameter of the hollow ring body 5.

[0099] Tenth embodiment, as Figure 16 and 17 As shown in 17 , the present invention discloses a drive mechanism nozzle structure for a pressurized water reactor nuclear power plant, which includes a drive mechanism nozzle 2 and the support member described in the ninth embodiment above, and will not be elaborated here. Among them, the hollow ring body 5 is embedded in the drive mechanism nozzle 2, and a sixth ring groove 25 corresponding to the third ring groove 56 is provided on the drive mechanism nozzle 2. The sixth ring groove 25 and the third ring groove 56 are used for welding, for example, continuous or intermittent welding and anti-loosening are carried out by using a self-fusion process.

[0100] In this embodiment, the inner wall surface at the top of the drive mechanism nozzle 2 is provided with a second step 21, and the inner diameter at the second step 21 is greater than the inner diameter of the drive mechanism nozzle 2.

[0101] The hollow ring body 5 is embedded in the socket 2 of the driving mechanism. The outer diameter of the hollow ring body 5 is basically the same as the inner diameter at the second step 21. For example, a small clearance fit or a slight interference fit is adopted to ensure that the hollow ring body 5 does not move significantly laterally within the socket 2 of the driving mechanism. Moreover, the inner diameter of the hollow ring body 5 is the same as the inner diameter of the socket 2 of the driving mechanism, and the end face of the first end A of the hollow ring body 5 abuts against the plane of the second step 21. The sixth annular groove 25 is provided on the plane of the second step 21.

[0102] In this embodiment, a third step 26 is provided on the inner wall surface where the inner diameter of the socket 2 of the driving mechanism is located. The third step 26 and the first step 57 on the inner wall surface of the first end A of the hollow ring body 5 form a seventh annular groove, and the inner diameter of the seventh annular groove is larger than the inner diameter of the socket 2 of the driving mechanism.

[0103] In addition, in any of the above embodiments, the socket 2 of the driving mechanism is made of stainless steel material and has higher hardness.

[0104] By implementing the present invention, the following beneficial effects are achieved:

[0105] The present invention discloses a support member, which includes a hollow ring body for being embedded in the socket of the driving mechanism and for a heat supply sleeve to pass through. Moreover, the two components of the hollow ring body and the socket of the driving mechanism are connected by necessary mechanical connection or welding to form an integral body with sufficient strength. Among them, the socket of the driving mechanism undertakes the pressure boundary function, and the hollow ring body undertakes the heat sleeve support function and the wear resistance function, ensuring that the heat sleeve no longer causes wear to the body of the socket of the driving mechanism, improving the overall wear life of the socket of the driving mechanism, reducing or canceling the operation and maintenance requirements of the socket of the driving mechanism, and improving the safety and economy of the unit.

[0106] Moreover, the support member has the advantages of long life, wear resistance, and replaceability. After excessive wear occurs to the support member, it can be disassembled and replaced, without affecting the integrity of the pressure-bearing structure of the socket.

[0107] In addition, the support member can be used in operating power plants and power plants under construction. Adopting the support member solution for in-service unit repair can ensure that the structure is restored to the original design and avoid affecting the driving line function.

[0108] It can be understood that the above embodiments only represent the preferred implementation modes of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several deformations and improvements can also be made, and these all belong to the protection scope of the present invention, that is, the embodiments described in "in some embodiments" can be freely combined with any of the above and below embodiments; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A support member, characterized in that, it includes a hollow ring body (5) for being embedded in the socket (2) of the drive mechanism and for the heat supply sleeve (3) to pass through; wherein, a connecting portion for connecting with the socket (2) of the drive mechanism and restricting relative movement in the axial and radial directions is provided at the first end of the hollow ring body (5) in the axial direction; the inner wall surface at the second end of the hollow ring body (5) in the axial direction is a conical surface (52) for supporting the heat sleeve (3).

2. The support member according to claim 1, characterized in that, a disassembly and assembly portion (53) for disassembly or installation is provided on the inner wall surface of the hollow ring body (5).

3. The support member according to claim 2, characterized in that, the disassembly and assembly portion (53) is a first annular groove for clamping.

4. The support member according to claim 3, characterized in that, the flanges at both ends of the first annular groove in the axial direction are respectively first chamfers (531).

5. The support member according to claim 1, characterized in that, the hollow ring body (5) or the conical surface (52) is made of a material with better wear resistance than the socket (2) of the drive mechanism.

6. The support member according to any one of claims 1 - 5, characterized in that, the connecting portion is an annular elastic clamping portion (51) extending axially from the end face of the first end of the hollow ring body (5) and forming a step with the end face of the first end.

7. The support member according to claim 6, characterized in that, the clamping portion (51) is a lip structure.

8. The support member according to claim 6, characterized in that, at least two grooves (512) opening from the second end to the first end of the hollow ring body (5) are provided in the circumferential direction of the clamping portion (51).

9. The support member according to any one of claims 1 - 5, characterized in that, the connecting portion is a second chamfer (54) for welding provided on the inner peripheral edge of the end face of the first end of the hollow ring body (5).

10. The support member according to any one of claims 1 - 5, characterized in that, the connecting portion is a second annular groove (55) for welding provided on the inner wall surface of the first end of the hollow ring body (5).

11. The support member according to any one of claims 1 - 5, characterized in that, the connecting portion is a third annular groove (56) for welding provided on the end face of the first end of the hollow ring body (5).

12. The support member according to claim 11, characterized in that, a first step (57) is provided on the inner wall surface of the first end of the hollow ring body (5), and the inner diameter of the first step (57) is greater than the inner diameter of the hollow ring body (5).

13. A socket structure of the drive mechanism of a pressurized water reactor nuclear power plant, characterized in that, it includes a socket (2) of the drive mechanism and the support member according to any one of claims 1 - 5; the hollow ring body (5) is embedded in the socket (2) of the drive mechanism, and a connected portion for cooperating and connecting with the connecting portion is provided on the socket (2) of the drive mechanism.

14. The socket structure of the drive mechanism of a pressurized water reactor nuclear power plant according to claim 13, characterized in that, The inner wall surface at the top of the drive mechanism socket (2) is provided with a second step (21), and the inner diameter at the second step (21) is larger than the inner diameter of the drive mechanism socket (2); The hollow ring body (5) is embedded in the drive mechanism socket (2). The outer diameter of the hollow ring body (5) is substantially the same as the inner diameter at the second step (21), and the inner diameter of the hollow ring body (5) is the same as the inner diameter of the drive mechanism socket (2). Moreover, the end face of the first end of the hollow ring body (5) abuts against the plane of the second step (21); The connected part is arranged on the second step (21) or on the inner wall surface where the inner diameter of the drive mechanism socket (2) is located.

15. A drive mechanism socket structure for a pressurized water reactor nuclear power plant, characterized in that, it includes a drive mechanism socket (2) and the support member according to any one of claims 6 - 8; The hollow ring body (5) and the clamping part (51) are embedded in the drive mechanism socket (2), and a fourth annular groove (22) for cooperating with and clamping the clamping part (51) is provided on the drive mechanism socket (2).

16. The drive mechanism socket structure for a pressurized water reactor nuclear power plant according to claim 15, characterized in that, The inner wall surface at the top of the drive mechanism socket (2) is provided with a second step (21), and the inner diameter at the second step (21) is larger than the inner diameter of the drive mechanism socket (2); The hollow ring body (5) is embedded in the drive mechanism socket (2). The outer diameter of the hollow ring body (5) is substantially the same as the inner diameter at the second step (21), and the end face of the first end of the hollow ring body (5) abuts against the plane of the second step (21). The inner diameter of the clamping part (51) is the same as the inner diameter of the drive mechanism socket (2); The fourth annular groove (22) is arranged on the inner wall surface where the inner diameter of the drive mechanism socket (2) is located.

17. The drive mechanism socket structure for a pressurized water reactor nuclear power plant according to claim 15, characterized in that, The outer diameter of the lip (511) of the clamping part (51) is larger than the outer diameter of the flange of the fourth annular groove (22).

18. A drive mechanism socket structure for a pressurized water reactor nuclear power plant, characterized in that, it includes a drive mechanism socket (2) and the support member according to claim 9; The hollow ring body (5) is embedded in the drive mechanism socket (2). A third chamfer (23) is provided on the drive mechanism socket (2), and the third chamfer (23) and the second chamfer (54) are used for welding.

19. The drive mechanism socket structure for a pressurized water reactor nuclear power plant according to claim 18, characterized in that, The inner wall surface at the top of the drive mechanism socket (2) is provided with a second step (21), and the inner diameter at the second step (21) is larger than the inner diameter of the drive mechanism socket (2); The hollow ring body (5) is embedded in the driving mechanism socket (2). The outer diameter of the hollow ring body (5) is substantially the same as the inner diameter at the second step (21), and the inner diameter of the hollow ring body (5) is the same as the inner diameter of the driving mechanism socket (2). Moreover, the end face of the first end of the hollow ring body (5) abuts against the plane of the second step (21). The third chamfer (23) is provided at the edge of the second step (21).

20. A structure of a driving mechanism socket for a pressurized water reactor nuclear power plant Characterized in that it includes a driving mechanism socket (2) and the support member described in claim 10; The hollow ring body (5) is embedded in the driving mechanism socket (2). A fifth ring groove (24) is provided on the driving mechanism socket (2), and the fifth ring groove (24) and the second ring groove (55) are used for welding.

21. According to the structure of the driving mechanism socket for a pressurized water reactor nuclear power plant described in claim 20 Characterized in that The inner wall surface at the top of the driving mechanism socket (2) is provided with a second step (21), and the inner diameter at the second step (21) is larger than the inner diameter of the driving mechanism socket (2); The hollow ring body (5) is embedded in the driving mechanism socket (2). The outer diameter of the hollow ring body (5) is substantially the same as the inner diameter at the second step (21), and the inner diameter of the hollow ring body (5) is the same as the inner diameter of the driving mechanism socket (2). Moreover, the end face of the first end of the hollow ring body (5) abuts against the plane of the second step (21). The fifth ring groove (24) is provided on the inner wall surface where the inner diameter of the driving mechanism socket (2) is located.

22. A structure of a driving mechanism socket for a pressurized water reactor nuclear power plant Characterized in that it includes a driving mechanism socket (2) and the support member described in claim 11 or 12; The hollow ring body (5) is embedded in the driving mechanism socket (2). A sixth ring groove (25) corresponding to the third ring groove (56) is provided on the driving mechanism socket (2), and the sixth ring groove (25) and the third ring groove (56) are used for welding.

23. According to the structure of the driving mechanism socket for a pressurized water reactor nuclear power plant described in claim 22 Characterized in that The inner wall surface at the top of the driving mechanism socket (2) is provided with a second step (21), and the inner diameter at the second step (21) is larger than the inner diameter of the driving mechanism socket (2); The hollow ring body (5) is embedded in the driving mechanism socket (2). The outer diameter of the hollow ring body (5) is substantially the same as the inner diameter at the second step (21), and the inner diameter of the hollow ring body (5) is the same as the inner diameter of the driving mechanism socket (2). Moreover, the end face of the first end of the hollow ring body (5) abuts against the plane of the second step (21). The sixth ring groove (25) is provided on the plane of the second step (21).

24. According to the structure of the driving mechanism socket for a pressurized water reactor nuclear power plant described in claim 23 Characterized in that On the inner wall surface where the inner diameter of the drive mechanism socket (2) is located, there is a third step (26), and the third step (26) and the first step (57) on the inner wall surface of the first end of the hollow ring body (5) form a seventh annular groove; The inner diameter of the seventh annular groove is larger than the inner diameter of the drive mechanism socket (2).

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