Voltage stabilizer supporting structure and voltage stabilizer system

Abstract

The invention provides a voltage stabilizer supporting structure and a voltage stabilizer system.The voltage stabilizer supporting structure comprises an upper supporting assembly and a lower supporting assembly, the upper supporting assembly is composed of a plurality of lug type supports and supporting lugs in a matched mode, and the upper supporting assembly is evenly arranged in the area close to an upper sealing head in the circumferential direction of an upper barrel of a voltage stabilizer and provides axial supporting and circumferential limiting; the lower supporting assembly is formed by connecting horizontal pull rods and a lower end socket integrated forging boss, the horizontal pull rods and the lower end socket integrated forging boss are evenly distributed in the annular direction, gapless horizontal limiting is achieved, and the space layout of the lower end socket is optimized. Through the synergistic effect of the upper support and the lower support, the voltage stabilizer is allowed to expand downwards in the axial direction under the thermal load, a support gap is eliminated through the special structural design of the support assembly, radiation exposure of operation and maintenance personnel caused by regular adjustment and maintenance is avoided, the problems of gap collision, overlarge thermal stress, structural fatigue and the like of a voltage stabilizer support structure are effectively solved, and the service life of the voltage stabilizer is prolonged. And the safety, shock resistance and economical efficiency of the voltage stabilizer are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power plant pressurizer structure, and particularly relates to a pressurizer supporting structure and a pressurizer system. BACKGROUND

[0002] As a key pressure control device in the reactor coolant system of a nuclear power plant, the pressurizer is used to maintain the stability of the primary loop pressure of the reactor under normal operation and transient conditions, and its supporting structure directly affects the safety of the nuclear island. In the long-term operation process, the thermal load will cause the pressurizer cylinder to produce significant thermal expansion deformation along the axial direction, and if the expansion constraint of the supporting system is improper, local stress concentration, weld fatigue and even structural failure are easily caused.

[0003] In the existing nuclear power plant device, the upper support of the pressurizer generally uses a radial limiter with a gap, which causes the gap to be adjusted every overhaul cycle, exposes the maintenance personnel to the radiation environment, and easily causes collision under seismic conditions. The lower support adopts a form such as a skirt or an ear support, which limits the space of the lower head of the pressurizer and affects the maintenance accessibility of devices such as electric heaters, and there is a risk of stress concentration and fatigue at the weld position. In addition, improper constraint of the supporting structure on the thermal expansion of the pressurizer will also cause the upper head connector to bear excessive thermal stress. The existing pressurizer supporting system still has deficiencies in terms of thermal expansion coordination, welding reliability and limiting precision, and these defects seriously restrict the safety and economy of the nuclear power plant. SUMMARY

[0004] The present application provides a pressurizer supporting structure and a pressurizer system to solve the technical problems of insufficient seismic performance of the pressurizer supporting structure, radiation exposure hazards of the maintenance personnel caused by gap detection and adjustment, large seismic response of the upper head, large expansion load of the upper head connector and insufficient fatigue resistance of the weld.

[0005] The present application provides a pressurizer supporting structure, comprising: an upper supporting assembly arranged at a region close to the upper head of the cylinder of the pressurizer and uniformly arranged along the ring direction of the cylinder, the upper supporting assembly comprising a plurality of supporting supports connected with the cylinder to realize axial support and ring direction limiting of the pressurizer; a lower supporting assembly arranged at the lower head of the pressurizer and uniformly arranged along the ring direction thereof, the lower supporting assembly comprising a plurality of horizontal limiting pieces connected with the lower head to realize horizontal limiting of the pressurizer, the upper supporting assembly being configured to fix the pressurizer in the axial direction, and the lower supporting assembly being configured to allow the pressurizer to have thermal expansion displacement in the axial direction.

[0006] In an embodiment of the present application, the supporting seat is an ear-shaped supporting seat, which is connected with a corresponding supporting ear fixed on the civil structure to transmit the load of the stabilizer to the civil structure.

[0007] In an embodiment of the present application, the number of the ear-shaped supporting seats is three, which are uniformly distributed along the ring direction of the stabilizer at an interval of 120°.

[0008] In an embodiment of the present application, the upper head is connected with the cylinder through a first weld seam, and the distance between the end of the ear-shaped supporting seat close to the upper head and the first weld seam is a predetermined distance L, which satisfies the minimum space requirement of the in-service inspection of the first weld seam.

[0009] In an embodiment of the present application, the predetermined distance L satisfies: L≥2t+50, wherein t is the thickness of the first weld seam.

[0010] In an embodiment of the present application, each of the ear-shaped supporting seats comprises at least two rib plates and a bottom plate, and the rib plates are distributed along the width direction of the bottom plate. The side edge of the rib plate extends along the axial direction of the stabilizer and is connected with the cylinder through welding, the bottom surface of the rib plate is connected with the bottom plate through welding, and a gap is arranged between the bottom plate and the cylinder.

[0011] In an embodiment of the present application, the rib plate is connected with the cylinder through full penetration welding.

[0012] In an embodiment of the present application, the rib plate and / or the cylinder is provided with a first welding groove at the corresponding welding area, and the first welding groove is a K-type welding groove.

[0013] In an embodiment of the present application, the rib plate is connected with the cylinder through a second weld seam, which extends along the axial direction of the cylinder and has a length not less than the size of the rib plate in the axial direction.

[0014] In an embodiment of the present application, the rib plate is connected with the bottom plate through full penetration welding.

[0015] In an embodiment of the present application, the bottom plate and / or the rib plate is provided with a second welding groove at the corresponding welding area, and the second welding groove is a K-type welding groove.

[0016] In an embodiment of the present application, the horizontal limiting member is a horizontal pull rod, and the lower head is uniformly provided with a plurality of bosses in the circumferential direction, and one end of the horizontal pull rod is connected with the lower head through the boss.

[0017] In an embodiment of the present application, the number of the bosses is four, and the bosses are uniformly distributed along the lower head at an interval of 90 degrees.

[0018] In an embodiment of the present application, the boss and the lower head are integrally forged.

[0019] In an embodiment of the present application, each of the horizontal pull rods comprises a connecting rod and two connecting heads, and an adjustable connecting mechanism is arranged between the connecting rod and the connecting heads, for adjusting the horizontal limiting gap during installation, so as to realize stable support and non-loose limiting of the pressure stabilizer.

[0020] In an embodiment of the present application, the bottom of the lower head is further connected with a fluctuation pipe, and the fluctuation pipe is used for compensating the thermal expansion displacement of the pressure stabilizer in the axial direction of the cylinder.

[0021] The present application further provides a pressure stabilizer system comprising the pressure stabilizer and the pressure stabilizer support structure according to any one of the above embodiments.

[0022] The pressure stabilizer support structure and the pressure stabilizer system according to the present application realize axial and circumferential limiting and cooperation with the lower support for providing horizontal limiting through the upper support assembly arranged close to the upper head, realize expansion of the pressure stabilizer in the axial direction under thermal load, and absorb the difference in the axial expansion displacement of the pressure stabilizer by the relatively weak fluctuation pipe arranged in the bottom in a spiral manner, so as to effectively reduce the displacement difference between the upper head and the connecting pipe caused by thermal expansion. The adjustable horizontal pull rod is used as the lower support of the pressure stabilizer, the support gap is eliminated, the in-service inspection process is avoided, the radiation exposure of the operation and maintenance personnel caused by periodic adjustment and maintenance is reduced, the collision load caused by the support gap under seismic conditions is reduced, the space of the lower head of the pressure stabilizer is greatly optimized, sufficient space is provided for the installation and maintenance of the electric heater, and the gas flowability of the lower head position is improved. In the upper support assembly of the present application, the connecting weld between the bottom plate of the lug support and the cylinder is cancelled and a gap is arranged, and the connecting weld between the lengthened rib plate and the cylinder is lengthened, so as to eliminate the stress concentration at the end of the weld and the risk of insufficient fatigue resistance of the weld position of the bottom plate and the cylinder on the basis of ensuring the structural strength. Through the cooperative cooperation of the upper and lower support assemblies, the present application can realize controllable displacement of the pressure stabilizer under thermal load and reliable limiting under accident conditions, and improve the overall seismic performance and operation safety. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application. It is apparent that the drawing in the following description is only some embodiments of the application, and other drawings can be obtained by those of ordinary skill in the art without creative labor on the basis of these drawings.

[0024] In the drawings: Figure 1 A perspective view of a support structure of a voltage stabilizer according to an embodiment of the application; Figure 2 A front view of a support structure of a voltage stabilizer according to an embodiment of the application; Figure 3 A top view of a support structure of a voltage stabilizer according to an embodiment of the application; Figure 4 A perspective view of an ear support of a support structure of a voltage stabilizer according to an embodiment of the application; Figure 5 A front view of an ear support of a support structure of a voltage stabilizer according to an embodiment of the application; Figure 6 A left view of an ear support of a support structure of a voltage stabilizer according to an embodiment of the application; Figure 7 A top view of an ear support of a support structure of a voltage stabilizer according to an embodiment of the application; Figure 8 A structural view of a lower support assembly of a support structure of a voltage stabilizer according to an embodiment of the application.

[0025] Reference signs are as follows: 100, upper support assembly; 200, lower support assembly; 300, voltage stabilizer; 400, fluctuation tube; 110, ear support; 111, rib plate; 112, bottom plate; 113, first welding bevel; 114, second welding bevel; 120, support ear; 210, horizontal pull rod; 211, connecting rod; 212, fork-shaped seat; 310, cylinder; 320, upper head; 330, lower head; 331, boss; 340, first welding seam. DETAILED DESCRIPTION

[0026] The present application is described and explained with additional specificity and detail through the use of the accompanying drawings in which:

[0027] It should be noted that the drawings included herewith are included merely for purposes of illustration and are not intended to limit the scope of the present application. The drawings are in fact included herein are a component-based representation of certain embodiments of the present application. However, actual implementation of the present application can not appear as set forth in the drawings. In addition, it should be understood that embodiments of the present application can be practiced with modification and alteration, and that the present application

[0028] In the following description, numerous specific details are discussed to provide a thorough understanding of embodiments of the application. However, in other instances, well-known or conventional details have not been described in order to avoid obscuring the description of other aspects of the present application. Moreover, those skilled in the art will appreciate that the present application can be practiced with modification and alteration, and that the present application is not limited to the embodiments described and illustrated herein.

[0029] The pressurizer is a key equipment of the reactor coolant system in nuclear power plants, which undertakes important functions such as pressure regulation, volume control and overpressure protection. Its support structure needs to meet the requirements of bearing self-weight, temperature transient, LOCA (Loss of coolant accident) load, seismic load and other conditions, while allowing thermal expansion displacement during normal operation and limiting excessive displacement during accident conditions. There are still many deficiencies in the existing support structure, for example, some second-generation nuclear power units use upper radial limiters and lower skirt supports, which have the problems of support gap that needs to be adjusted regularly, leading to radiation exposure of maintenance personnel, gap collision affecting seismic performance, narrow lower space restricting electric heater maintenance, poor heat dissipation accelerating equipment aging, etc.; some third-generation nuclear power units follow similar upper support, and the lower part uses lug-type supports, in addition to the gap problem, there is also a problem of insufficient fatigue resistance caused by stress concentration in the weld area; in addition, some nuclear power units use complex structures of ring combination with legs, which not only have a large number of components and huge installation and maintenance workload, but also need to bear the load of ADS (Automatic Depressurization System) module. The existing support structure generally has the problems of collision risk and maintenance difficulty caused by support gap, excessive dynamic response caused by unreasonable structure arrangement, and limited space affecting equipment maintenance, which seriously affects the safety and economy of nuclear power plant operation.

[0030] Please refer to Figures 1 to 8The application provides a support structure of a pressurizer, which comprises an upper support assembly 100 and a lower support assembly 200, the upper support assembly 100 is arranged at a region close to an upper head 320 of a cylinder 310 of the pressurizer 300 and is uniformly arranged along the ring direction of the cylinder 310, the upper support assembly 100 comprises a plurality of support supports, the support supports are connected with the cylinder 310 to realize axial support and ring direction limiting of the pressurizer 300; the lower support assembly 200 is arranged at a lower head 330 of the pressurizer 300 and is uniformly arranged along the ring direction of the lower head 330, the lower support assembly 200 comprises a plurality of horizontal limiting pieces, the horizontal limiting pieces are connected with the lower head 330 to realize horizontal limiting of the pressurizer 300, the upper support assembly 100 is configured to fix the pressurizer 300 in the axial direction, and the lower support assembly 200 is configured to allow the pressurizer 300 to have thermal expansion displacement in the axial direction.

[0031] Please refer to Figures 1 to 8 It can be understood that the pressurizer 300 mainly bears various dynamic / static loads such as self weight, temperature transient, pressure transient, LOCA load, earthquake load, nozzle load and the like, the design of the support structure of the pressurizer needs to ensure that reliable support can be provided for the pressurizer 300, so that the pressurizer 300 can remain stable under various working conditions, and the support structure of the pressurizer can bear various working conditions and safely transmit the load to the floor and other civil structures, so as to limit the excessive displacement of the pressurizer 300 under the LOCA load and the earthquake load, and keep the position of the central axis of the pressurizer 300 relatively fixed. In the support structure of the pressurizer of the application, the upper support assembly 100 can bear most of the self weight and vertical load of the pressurizer 300, limit the overall displacement of the pressurizer 300 in the axial direction, restrict the ring direction rotation and prevent the upper horizontal swing; and the lower support assembly 200 is used for limiting the displacement and swing of the lower part of the pressurizer 300 in the horizontal direction, while allowing the lower part to freely expand or contract in the axial direction, the structure of the circumferential arrangement of the plurality of horizontal limiting pieces significantly reduces the occupied space in the region of the lower head, provides sufficient operation space for the installation, maintenance and replacement of the electric heater, and improves the air circulation condition of the region, which is beneficial to the timely dissipation of heat. In the process of starting or running of the nuclear power plant, the temperature of the coolant in the pressurizer 300 rises, and the pressurizer 300 body will have thermal expansion, under the cooperation of the upper support assembly 100 and the lower support assembly 200, the thermal expansion deformation of the whole pressurizer 300 is transmitted from the fixed support point of the upper part to the lower part, so as to significantly reduce the relative displacement difference between the upper head 320 and the connecting pipeline, effectively relieve the thermal stress; meanwhile, the space layout of the lower head 330 can ensure sufficient air circulation environment, which can effectively reduce the working temperature of the electric heater joint, the sealing element and the cable and other non-metallic components, delay the thermal aging process and prolong the service life.

[0032] Please refer toFigures 1 to 8 The voltage stabilizer supporting structure of the present application, through the cooperation of the upper and lower supporting assemblies, meets the supporting requirements of the voltage stabilizer, realizes the controllable displacement of the voltage stabilizer 300 under thermal load and the reliable limiting under accident conditions, significantly improves the equipment maintenance conditions and operating environment, has simple structure and high reliability, and fundamentally solves a series of problems such as gap collision caused by supporting gap and its adverse effects on equipment anti-seismic, harm to the health of operating personnel caused by operating radiation exposure, large seismic response of the upper head 320 of the voltage stabilizer 300, large expansion load of the connecting pipe of the upper head 320, cramped space and thermal stress concentration of the lower head 330, and weak structure anti-fatigue damage capacity.

[0033] Please refer to Figures 1 to 7 In an embodiment of the present application, the upper supporting assembly 100 is arranged at the upper part of the cylinder 310 of the voltage stabilizer 300, provides vertical (i.e. axial) and ring supporting for the voltage stabilizer 300, is arranged as close as possible to the upper head 320 along the axial direction of the voltage stabilizer 300, and ensures that the voltage stabilizer 300 mainly expands downward along the axial line of the cylinder 310 under temperature rising conditions. The upper supporting assembly 100 includes a supporting seat and an ear 120. Specifically, the supporting seat is an ear-shaped seat 110 which is connected with the corresponding ear 120 in a matched manner, and the ear 120 is fixed on the civil structure to transmit the load of the voltage stabilizer 300 to the civil structure. The ear-shaped seat 110 and the ear 120 can be connected by bolts or welding, etc. Through the close cooperation of the ear-shaped seat 110 and the ear 120, reliable supporting of the voltage stabilizer 300 is realized, and ring limiting constraint is formed to avoid the gap problem of radial limiting, prevent the cylinder 310 from rotating or deviating due to earthquake or operating load, and significantly reduce the collision risk. It should be noted that the supporting seat is not limited to the ear-shaped seat 110, and other structural forms such as hinged seat can also be used in other embodiments as long as the functions of axial supporting and ring limiting can be realized.

[0034] Please refer to Figures 1 to 7 In an embodiment of the present application, the number of ear-shaped seats 110 is three, and they are uniformly distributed at an interval of 120° along the ring direction of the voltage stabilizer 300. Through this symmetrical layout, it can be ensured that the stress of the cylinder 310 is symmetrical, the load transmission is uniform, the stress concentration caused by over-constraint is avoided, a stable three-point supporting system is provided for the voltage stabilizer 300, the displacement response of the voltage stabilizer 300 under various conditions can be effectively controlled, the dynamic stability of the equipment under the action of earthquake is improved, and the local deformation of the upper head 320 and the welding position of the cylinder 310, etc. is significantly reduced.

[0035] Please refer to Figures 1 to 7In an embodiment of the present application, the upper head 320 is connected to the cylinder 310 by the first weld 340, and the lug support 110 is arranged at a distance L from the first weld 340 at the end close to the upper head 320, and the distance L satisfies the minimum space requirement for in-service inspection of the first weld 340. The distance is arranged to ensure that the weld area can be completely detected by non-destructive testing means during service, so as to facilitate early detection of welding defects and stress corrosion problems, thereby improving the safety of equipment operation, and at the same time, the optimal support position can be ensured, so that the upper support can effectively control the displacement of the upper head area.

[0036] Please refer to Figures 1 to 7 In an embodiment of the present application, the distance L satisfies: L≥2t+50, wherein t is the thickness of the first weld 340. The distance relationship is determined based on the actual experience of in-service inspection and structural mechanics analysis, so as to ensure that the inspection equipment has enough space to operate and provide enough margin to prevent uncertain factors in the inspection process. It can be understood that, if the distance L is too small, the stress superposition or detection blind area may occur between the lug support 110 and the weld area, which will affect the inspection quality of the weld; if the distance is too large, the stress path of the support is prolonged, and the structural stiffness is reduced, which will significantly reduce the supporting effect. By limiting L≥2t+50, the support layout is optimized on the basis of balancing the detection space and the structural stiffness, and the fatigue life of the weld area of the stabilizer 300 is significantly improved.

[0037] Please refer to Figures 1 to 7In an embodiment of the present application, each ear support 110 comprises at least two rib plates 111 and a bottom plate 112, the rib plates 111 being distributed along the width direction of the bottom plate 112; the side edges of the rib plates 111 extend along the axial direction of the stabilizer 300 and are connected to the cylinder body 310 by welding, the bottom surface of the rib plates 111 is connected to the bottom plate 112 by welding, and a gap is provided between the bottom plate 112 and the cylinder body 310. In the structural design of the ear support 110, the rib plates 111 bear the main load transmission function, can effectively disperse the load transmission path, and reduce the local stress concentration of the cylinder body 310; the bottom plate 112 is connected to the rib plates 111, which enhances the overall stiffness of the ear support 110 and improves the stability; and the gap provided between the bottom plate 112 and the cylinder body 310 solves the problem of poor local fatigue resistance of the weld, and through the gap setting, the local over-restraint of the ear support 110 on the joint part can be effectively avoided, the stress and stress concentration generated at the connecting weld between the bottom plate 112 and the cylinder body 310 when the stabilizer 300 is subjected to circumferential and radial deformation can be avoided, at the same time, a buffer space can be provided for the thermal expansion of the cylinder body 310, the structural thermal stress adaptability is improved, and the fatigue resistance of the structure is significantly improved. The ear support 110 and the lug 120 are connected in cooperation to form a support system at the upper part, and reliable support and stress release of the stabilizer 300 are realized. It should be noted that the structure of the ear support 110 is not limited, and it can adopt a double-ear, three-ear or multi-ear structure, etc., to adapt to the stress requirements of stabilizers 300 of different specifications.

[0038] Please refer to Figures 1 to 7 In an embodiment of the present application, the rib plates 111 and the cylinder body 310 are connected by full penetration welding, the rib plates 111 and / or the cylinder body 310 are provided with first welding grooves 113 corresponding to the welding area, and the first welding grooves 113 are K-shaped welding grooves. The full penetration welding process ensures the strength and integrity of the connection part; the design of the K-shaped groove enables the weld to achieve complete penetration, and at the same time, the welding deformation can be better controlled during the welding process, which is also conducive to the filling of the welding material and the discharge of gas, thereby improving the weld forming quality and detectability, and is suitable for high-strength welding occasions. It should be noted that in other embodiments, the groove form can also be other structures such as X-shaped, etc., which can be selected according to the structure of the cylinder body 310 and the welding process parameters, etc., to take into account the process and strength requirements.

[0039] Please refer to Figures 1 to 7In an embodiment of the present application, the rib plate 111 is connected with the cylinder 310 through a second weld seam, which extends along the axial direction of the cylinder 310 and has a length not less than the size of the rib plate 111 in the axial direction. The axial extension of the weld seam can effectively disperse the load path, so that the stress is uniformly transmitted along the axial direction of the cylinder 310, thereby reducing the risk of local stress concentration at the weld toe and improving the fatigue life of the joint. It can be understood that the second weld seam bears and transmits the load between the support assembly and the body of the pressurizer 300. By increasing the length of the weld seam, the stress level per unit length is reduced, so that the structure has better durability under cyclic loading. The consistent length of the weld seam with the size of the rib plate 111 can ensure that the welding connection strength is matched, and prevent the hidden danger of insufficient bearing capacity of the welding area.

[0040] Referring to Figures 1 to 7 In an embodiment of the present application, the rib plate 111 is connected with the bottom plate 112 through a full penetration welding. Specifically, the bottom surface of each rib plate 111 is connected with the upper surface of the bottom plate 112 through a third weld seam, and the welding area extends along the full length of the bottom surface of the rib plate 111 to ensure uniform distribution of the load. The bottom plate 112 and / or the rib plate 111 is provided with a second welding groove 114 at the corresponding welding area, which is preferably a K-type welding groove, so that the weld seam can be fully penetrated to form a connection joint with good mechanical properties. This connection mode ensures the structural integrity of the lug-type support 110 as a whole, improves the overall stiffness and bending resistance of the rib plate 111 and the bottom plate 112, so that the rib plate 111 and the bottom plate 112 can form a firm connection and jointly bear the load transmission function. The design of the K-type groove ensures the welding quality and avoids the initiation of fatigue cracks due to insufficient welding, thereby improving the fatigue resistance and long-term service reliability of the support as a whole.

[0041] Referring to Figures 1 to 7 , Figures 1 to 7 and Figures 1 to 7In an embodiment of the present application, the lower support assembly 200 comprises a horizontal limiting member, specifically, a horizontal tie rod 210, and the lower head 330 is uniformly provided with a plurality of bosses 331 in the circumferential direction, and one end of the horizontal tie rod 210 is connected with the lower head 330 through the bosses 331, which can reliably limit the horizontal displacement of the stabilizer 300 under the action of an earthquake or an operating load, and prevent the stabilizer 300 from swinging or deviating as a whole. The horizontal tie rod 210 adopts a simple rod structure, which significantly reduces the structural complexity and space occupation of the lower head area compared with structures such as a skirt or an ear support 110, and provides sufficient operation space for the installation, maintenance and repair of the electric heater; at the same time, the open structure design also avoids the closure of the support structure to the lower head area, effectively improves the gas flowability of the area, promotes the timely dissipation of heat, and improves the working environment of the electric heater and other equipment. The horizontal tie rod 210 cooperates with the upper support assembly 100 to fix the axial position of the stabilizer 300, and allows the axial free expansion but restricts the horizontal direction, realizing the balance between the thermal expansion and the seismic performance of the stabilizer 300, effectively reducing the dynamic response of the upper head area, and improving the stress state of the pipe connection part. It can be understood that the structure of the horizontal tie rod 210 can effectively prevent structural impact under conditions such as an earthquake, and at the same time, the tie rod structure has no restraining effect on the axial deformation under thermal conditions, thereby avoiding the accumulation of thermal stress.

[0042] Please refer to Figure 1 , Figure 2 and Figure 8 , in an embodiment of the present application, the number of bosses 331 is four, and they are uniformly distributed at an interval of 90° along the circumferential direction of the lower head 330, and each boss 331 is matched with a tie rod to provide effective horizontal limiting for the stabilizer 300. Through symmetrical arrangement, symmetrical distribution of the horizontal load of the lower part of the stabilizer 300 can be realized, the uniformity of the horizontal limiting is ensured, a stable horizontal restraint system is provided for the stabilizer 300, local deformation of the head is reduced, and the overall seismic symmetry and load balance are improved.

[0043] Please refer to Figure 1 , Figure 2 and Figure 8 , in an embodiment of the present application, the boss 331 and the lower head 330 are integrally forged and formed, the material continuity between the boss 331 and the lower head 330 is ensured through the integrated forging process, the stress concentration problem that may be caused by welding connection and the like is avoided, the structural integrity and carrying capacity are significantly improved, the stress distribution state is improved, and the fatigue resistance is improved; the integrated structure also simplifies the manufacturing process, enhances the geometric precision and crack resistance, and has good reliability.

[0044] Please refer to Figure 1 , Figure 2 and Figure 8In an embodiment of the present application, each horizontal tie rod 210 comprises a connecting rod 211 and two connecting heads, and an adjustable connecting mechanism is arranged between the connecting rod 211 and the connecting heads for adjusting the horizontal limiting gap during installation, so as to realize stable support and non-loose limiting of the stabilizer 300. Specifically, the connecting head is, for example, a fork-shaped seat 212 with a U-shaped opening structure, and the overall length of the tie rod can be accurately adjusted by adjusting the screwing depth of the connecting rod 211 and the fork-shaped seat 212. The fork-shaped seat 212 can be connected with the boss 331 on the lower head 330 through a bolt or a pin shaft, and the other end is connected with a fixed base on the civil structure, so as to form a complete force transmission path. Through the connecting structure, it is ensured that the connecting member uniformly distributes stress when loaded, avoids local overload, is convenient for maintenance, and significantly reduces the risk of loosening in long-term operation. The adjustable connecting mechanism can flexibly adapt to the site deviation during the installation process, accurately control and eliminate the gap of the horizontal limiting, realize non-loose limiting under various working conditions, effectively prevent wear and collision caused by vibration, and the like. In addition, the simple rod structure of the horizontal tie rod 210 is combined with the compact design of the fork-shaped seat 212, the space of the lower head 330 is optimized, a more sufficient operation area is provided for the arrangement and maintenance of the electric heater, air circulation is promoted, and heat dissipation conditions are improved. It should be noted that the structure of the horizontal tie rod 210 is not limited, for example, a ball joint and the like can be used in cooperation with the rod structure to realize horizontal limiting, and stable horizontal limiting can be realized.

[0045] Please refer to Figure 1 , Figure 2 and Figure 8, in an embodiment of the present application, the bottom of the lower head 330 is connected with a corrugated pipe 400 for compensating the thermal expansion displacement of the surge tank 300 axially downward along the cylinder 310. Specifically, the corrugated pipe 400 is designed as a flexible pipe with relatively low stiffness, which is installed in the bottom area of the surge tank 300 in a spiral arrangement, and can absorb and accommodate the axial displacement of the cylinder 310 of the surge tank 300 due to temperature change through its own deformation. During the operation of the nuclear power plant, when the internal temperature of the surge tank 300 rises, the cylinder 310 will expand due to heat, and since the upper support assembly 100 fixes the upper part of the surge tank 300, the thermal expansion mainly develops axially downward, at this time, the flexible design of the corrugated pipe 400 allows it to compensate for this downward displacement through the elastic deformation of the spiral structure, and since the corrugated pipe 400 has relatively weak stiffness, it generates a small reaction force when bearing axial displacement, further reducing the load transmitted to the connecting pipe system, thereby avoiding excessive relative displacement between the surge tank 300 and the connecting pipe, and significantly reducing the displacement difference between the upper head area and the connecting pipe, valve and other components, effectively relieving the additional stress caused by uneven thermal expansion. Through this collaborative design, the corrugated pipe 400, together with the upper support assembly 100 and the lower support assembly 200, forms a displacement compensation system, which not only ensures the thermal displacement requirement of the surge tank 300 during normal operation, but also effectively reduces the expansion displacement difference between the upper part of the surge tank 300, the upper head 320 and the pipe, valve and other components, relieves thermal stress, and ensures the structural integrity under accident conditions.

[0046] Please refer to Figure 1 Figure 2 Figure 8 Figures 1 to 8The stabilizer system is supported by the upper supporting assembly 100 and the lower supporting assembly 200, and the upper supporting assembly 100 and the lower supporting assembly 200 are coordinated in structure and function, so that the stabilizer 300 can be stably supported and axial thermal expansion can be released under the working condition. Specifically, the upper supporting assembly 100 is rigidly connected with the lug support 110 and the lug 120, and provides axial support and annular limiting for the stabilizer 300, so as to determine the fixed reference position of the stabilizer 300 in the installation space; the lower supporting assembly 200 is horizontally limited by the horizontal limiting piece arranged at the lower head 330, so as to prevent the stabilizer 300 from being horizontally displaced under the action of an earthquake or a running load. The horizontal limiting piece is connected in an adjustable or hinged manner, and the action direction of the horizontal limiting piece is perpendicular to the axis of the stabilizer 300, so that the horizontal limiting piece only forms a gapless limiting for the horizontal direction of the stabilizer 300, and does not rigidly constrain the axial direction. When the stabilizer 300 is axially downwardly thermally expanded along the cylinder 310 due to the temperature rise of the internal medium during the running process, the connecting heads at both ends of the horizontal limiting piece can be slightly rotated or shifted through spherical contact or pin shaft rotation structure, so that the axial displacement of the stabilizer 300 can be smoothly released. At the same time, the fluctuation tube 400 at the bottom of the lower head 330 can absorb the axial thermal displacement, so as to avoid additional stress caused by the axial obstruction. Therefore, the upper supporting structure and the lower supporting structure of the stabilizer can allow the stabilizer 300 to be freely thermally expanded in the axial direction while keeping the stabilizer 300 to be stably positioned in the horizontal direction, so as to form the supporting characteristics of horizontal rigid constraint and longitudinal flexible release, ensure that the stabilizer 300 can be freely thermally expanded while being effectively limited in displacement, effectively avoid the collision problem under the working condition of an earthquake and the stress concentration problem caused by the limited thermal expansion, and ensure the stability, safety and long-term service reliability of the stabilizer 300 under the action of an earthquake load and a thermal load, and have good maintenance convenience, so as to provide a reliable guarantee for the long-term stable operation of a nuclear power plant.

[0047] In summary, the stabilizer supporting structure and the stabilizer system can effectively control the displacement response of the upper head region through the specific arrangement and connection mode of the upper supporting assembly 100, eliminate the maintenance risk and collision risk through the gapless design of the lower supporting assembly 200, optimize the lower space, improve the fatigue resistance through the optimized connection mode of the lug support 110, and finally realize the comprehensive improvement of the safety, reliability and maintainability of the supporting system.

[0048] The above-described embodiments are merely illustrative for the principles of the application and its efficacy, and are not intended to limit the application. Any modification or change to the above-described embodiments can be made by any person skilled in the art without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the application should be covered by the claims of the application.

[0049] In the description of the description herein, many specific details are provided, such as examples of components and / or methods, in order to provide a thorough understanding of embodiments of the present application. It will be apparent, however, to one skilled in the art that the embodiments of the present application can be practiced without one or more of the specific details, or with other devices, systems, components, methods, materials, parts, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail in order to avoid obscuring aspects of embodiments of the present application.

[0050] Reference throughout this specification to "an embodiment", "embodiments" or "certain embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application and is not necessarily included in all embodiments. Thus, the appearances of the phrase "in one embodiment", "in an embodiment", or "in certain embodiments" in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present application can be combined in any suitable manner in one or more other embodiments. It is understood that other variations and modifications of the applications described and illustrated herein can be made based on the teachings herein, and are therefore within the scope of the present application.

[0051] It is also to be understood that one or more of the elements of the drawings shown can also be implemented in a more separated or more integrated manner, or even removed because in certain cases this is not operational or because it can be useful according to a particular application.

[0052] In addition, unless explicitly stated otherwise, any reference signs in the drawings should be considered only as illustration and not as limiting. Further, unless specifically stated otherwise, the use of the term "or" as used herein is generally intended to mean "and / or", i.e. to include the conjunctive as well as the disjunctive sense. Combinations of components or steps will also be considered as being noted, where the context permits, even if not specifically stated in the above description and claims.

[0053] As used in the description of the description herein and in the following claims, the articles "a", "an" and "the" include plural references unless otherwise indicated. Also as used in the description of the description herein and in the following claims, the phrase "in an embodiment" means "in at least one embodiment" unless otherwise explicitly stated.

[0054] The above description of the illustrated embodiments of the application (including what is described in the abstract) is not intended to be exhaustive or to limit the application to the precise forms disclosed. While specific embodiments of, and examples for, the application are described herein for illustrative purposes, various equivalent modifications are possible within the spirit and scope of the application, as those skilled in the relevant art will recognize and appreciate. As indicated, these modifications can be made to the above described embodiments of the application and yet the application will fall within the scope of the application. In some cases, certain features, functions, and / or elements can be combined and / or divided into separate features, functions, and / or elements. In some cases, certain features, functions, and / or elements can be omitted completely without departing from the scope of the application.

[0055] The systems and methods have been described generally herein as facilitating an understanding of the details of the application. Moreover, various specific details have been given in order to provide a thorough understanding. It will be appreciated, however, that one of ordinary skill in the relevant art will recognize and appreciate that embodiments of the application can be practiced without one or more of the specific details, or with other devices, systems, assemblies, methods, components, materials, parts, and / or the like. In other instances, well-known structures, materials, and / or operations have not been shown or described in detail in order to avoid obscuring aspects of embodiments of the application.

[0056] Accordingly, although the application has been described herein in reference to specific embodiments thereof, many modifications, alterations and changes can be suggested to one skilled in the art and it is intended to include all such modifications, alterations and changes in the scope of the present application. Accordingly, the specification and figures are to be regarded in an illustrative manner and representations are to be deemed as abstractions of the principles of the application. The application is not limited to the exact details shown and described and obvious modifications will be apparent to one skilled in the art. Thus, numerous modifications can be made to the specific embodiments described above without departing from the spirit and scope of the application. Therefore, the scope of the application is not to be determined solely by the preferred embodiments, and the scope of the application is to be only limited by the claims that follow.

Claims

1. A voltage regulator support structure, characterized in that, include: An upper support assembly is disposed in the region of the cylinder of the voltage regulator near the upper end cap and is evenly arranged circumferentially along the cylinder. The upper support assembly includes multiple support seats, which are connected to the cylinder to achieve axial support and circumferential limiting of the voltage regulator. The lower support assembly is disposed at the lower end cap of the voltage regulator and evenly arranged around it. The lower support assembly includes a plurality of horizontal limiting members, which are connected to the lower end cap to achieve horizontal limiting of the voltage regulator. The upper support assembly is configured to fix the voltage regulator in the axial direction, and the lower support assembly is configured to allow the voltage regulator to undergo thermal expansion displacement in the axial direction.

2. The voltage regulator support structure according to claim 1, characterized in that, The support is an ear-type support, which is connected to a corresponding ear. The ear is fixed to the civil structure and is used to transfer the load of the voltage stabilizer to the civil structure.

3. The voltage regulator support structure according to claim 2, characterized in that, The number of lug supports is three, and they are evenly distributed at 120° intervals along the circumferential direction of the voltage stabilizer.

4. The voltage regulator support structure according to claim 2, characterized in that, The upper end cap is connected to the cylinder body by a first weld. The end of the lug support near the upper end cap is at a predetermined distance L from the first weld. The predetermined distance L meets the minimum space requirement for in-service inspection of the first weld.

5. The voltage regulator support structure according to claim 4, characterized in that, The predetermined distance L satisfies: L≥2t+50, where t is the thickness of the first weld.

6. The voltage regulator support structure according to claim 2, characterized in that, Each of the ear-type supports includes at least two stiffening plates and a base plate, the stiffening plates being distributed along the width direction of the base plate; The side edge of the stiffener extends along the axial direction of the voltage stabilizer and is welded to the cylinder. The bottom surface of the stiffener is welded to the bottom plate, and a gap is provided between the bottom plate and the cylinder.

7. The voltage regulator support structure according to claim 6, characterized in that, The stiffening plate and the cylinder are connected by full penetration welding.

8. The voltage regulator support structure according to claim 7, characterized in that, The stiffening plate and / or the cylinder are provided with a first welding bevel in the corresponding welding area, and the first welding bevel is a K-type welding bevel.

9. The voltage regulator support structure according to claim 6, characterized in that, The stiffening plate is connected to the cylinder by a second weld, which extends along the axial direction of the cylinder and its length is not less than the dimension of the stiffening plate in that axial direction.

10. The voltage regulator support structure according to claim 6, characterized in that, The stiffening plate and the base plate are connected by full penetration welding.

11. The voltage regulator support structure according to claim 10, characterized in that, The base plate and / or the stiffening plate are provided with a second welding bevel in the corresponding welding area, and the second welding bevel is a K-type welding bevel.

12. The voltage regulator support structure according to claim 1, characterized in that, The horizontal limiting component is a horizontal tie rod, and the lower end cap is evenly provided with multiple bosses along the circumference. One end of the horizontal tie rod is connected to the lower end cap through the bosses.

13. The voltage regulator support structure according to claim 12, characterized in that, The number of protrusions is four, and they are evenly distributed at 90° intervals along the circumferential direction of the lower end cap.

14. The voltage regulator support structure according to claim 12, characterized in that, The boss and the lower end cap are integrally forged.

15. The voltage regulator support structure according to claim 12, characterized in that, Each of the horizontal tie rods includes a connecting rod and two connectors. An adjustable connection mechanism is provided between the connecting rod and the connectors to adjust the horizontal limiting gap during installation, so as to achieve stable support and no loosening of the voltage regulator.

16. The voltage regulator support structure according to claim 1, characterized in that, The bottom of the lower end cap is also connected to a wave tube, which is used to compensate for the thermal expansion displacement of the pressure regulator along the axial direction of the cylinder.

17. A voltage regulator system, characterized in that, It includes a voltage regulator and a voltage regulator support structure as described in any one of claims 1 to 16.

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