CN103594125A - Sealing ring used for reactor pressure vessel - Google Patents

Sealing ring used for reactor pressure vessel Download PDF

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Publication number
CN103594125A
CN103594125A CN 201310616690 CN201310616690A CN103594125A CN 103594125 A CN103594125 A CN 103594125A CN 201310616690 CN201310616690 CN 201310616690 CN 201310616690 A CN201310616690 A CN 201310616690A CN 103594125 A CN103594125 A CN 103594125A
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layer
interface
ring
sealing
temperature
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CN 201310616690
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Chinese (zh)
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董亚超
马志刚
刘青松
韩嘉兴
白杉
朱建强
吴昊
毛华平
侯勇
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中科华核电技术研究院有限公司
苏州宝骅机械技术有限公司
中国广核集团有限公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors
    • Y02E30/40Other aspects relating to nuclear fission

Abstract

The invention discloses a sealing ring used for a reactor pressure vessel, which comprises a coating layer in a hollow circular ring state, an interface layer and a built-in layer, the interface layer is accommodated in a hollow structure of the coating layer and clung to the inner wall of the coating layer, the built-in layer is accommodated in the hollow structure of the interface layer and clung to the inner wall of the interface layer, the cross section of the coating layer, the interface layer and the built-in layer are in a C-shaped structure, the built-in layer forms a spiral tightening spring in a circular ring state which is characterized by welding end to end by winding a wire material with a cylindrical shape, the spiral tightening spring clings to the part behind the inner wall of the interface layer, and has gap to the inner wall of the interface layer, wherein, the wire material is a nickel-based high temperature alloy material, the mass percentage of cobalt in the nickel-based high temperature alloy material is less than or equal to 0.1%, and mass percentage of copper is less than or equal to 0.2%. The nationalized sealing ring is capable of adapting the conditions of high temperature, high voltage, and instantaneous large temperature difference and pressure fluctuation in a nuclear power station, the sealing ring can ensure sealing performance of the reactor pressure vessel, and simultaneously, the cost is reduced.

Description

反应堆压力容器用密封环 Reactor pressure vessel seal ring

技术领域 FIELD

[0001] 本发明涉及核电站反应堆压力容器密封领域,尤其涉及一种反应堆压力容器用密封环。 [0001] The present invention relates to the field of nuclear power plant reactor pressure vessel was sealed, the reactor pressure vessel and particularly to a seal ring.

背景技术 Background technique

[0002] 目前,压水堆是核电站的主流堆型,全世界约60%的反应堆都是压水堆,压水堆核电站一般分为两个回路:一回路系统及二回路系统,一回路系统称为核岛部分,二回路系统是常规岛部分,具有汽轮机部分和发电机部分。 [0002] Currently, the pressurized water reactor nuclear power plant is the mainstream type of reactor, about 60% of the world's reactors are pressurized water reactors, pressurized water reactor nuclear power plants are generally divided into two circuits: the primary system and the secondary cooling system, a loop system nuclear called island section, two loop system is a conventional island section, having a steam turbine and the power generator portion. 压水堆核电站的一回路系统与二回路系统完全隔开,它是一个密闭的循环系统。 PWR primary system and the secondary cooling system completely separated, it is a closed loop system. 核电站的原理流程为:主泵将高压冷却剂送入反应堆,冷却剂把核燃料放出的热能带出反应堆,并进入蒸汽发生器,通过传热管把热量传给管外的二回路水,使水沸腾产生蒸汽;冷却剂流经蒸汽发生器后,再由主泵送入反应堆,这样来回循环,不断地把反应堆中的热量带出并转换产生蒸汽,从蒸汽发生器出来的高温高压蒸汽,推动汽轮发电机组发电。 Process for the nuclear power station principle: the main pump high-pressure coolant into the reactor, the nuclear fuel discharged coolant heat out of the reactor, and into the steam generator through the heat transfer tubes of the heat to the outer tube two primary water, the water steam generated by the boiling; coolant through the steam generator, and then by the main pump into the reactor, so cycle back and forth continuously to the reactor with the heat and steam generating conversion, out of the high temperature high pressure steam from the steam generator, to promote Turbine power generation. 做过功的废汽在冷凝器中凝结成水,再由凝结给水泵送入加热器,重新加热后送回蒸汽发生器,这就是二回路循环系统。 The work done in the condenser exhaust steam condenses into water, and then fed from the condensate pump to the heater, was heated again returned to the steam generator, which is two-loop circulation system.

[0003] 其中,核电站反应堆压力容器由筒体和顶盖两部分组成,筒体和顶盖之间通过筒体法兰、顶盖法兰和密封件实现密封连接。 [0003] wherein the cylindrical reactor pressure vessel and the top two parts, through the barrel flange, a cap sealing flanges and seals the connection between the barrel and the cap. 密封件的存在保证了压力容器内冷却剂的泄漏量能够维持在允许的范围内。 To ensure the presence of the seal leakage of the coolant within the pressure vessel can be maintained within the allowable range. 目前,我国核电站反应堆压力容器所使用的密封件及其所使用的材料均为国外产品,由于该产品为与核安全相关的重要产品,故核电运营单位应用国内产品的难度较大。 At present, the seal material and the use of Chinese nuclear power plant reactor pressure vessel used are foreign products, because the product is an important product related to nuclear safety, nuclear power operating units apply it more difficult domestic product. 然而,一套压力容器密封件的成本需要几十万,且每开一次反应堆顶盖就需要更换一套密封件,由此造成了密封件的高成本。 However, the cost of a pressure vessel seal requires hundreds of thousands, and each reactor head once a need to replace a seal member, thereby causing the cost of the seal. 因此,密封件国产化不仅在经济效益上有重大意义,而且也对中国核电国产化进程具有重要的战略意义。 Accordingly, seals localization of great significance not only in economic benefits, but also has important strategic significance for Chinese nuclear power localization process.

[0004] 另外,核电站机组正常运行时,要求密封件能够承受高温、高压工况;机组启停堆时,密封件要承受升/降温速率达到28 °C /h的大温差作用,而且在某些情况下,瞬态温差还有可能达到128°C ;另外,在机组正常运行的某些瞬态工况下,密封件还要承受压力波动的作用。 [0004] In addition, nuclear power plant unit normal operation, seal is required to withstand high temperatures, high pressure conditions; start and stop when the unit stack, the sealing member to bear L / cooling rates up to 28 ° C / h to effect large temperature difference, and in a under some circumstances, there may be transient temperature difference reached 128 ° C; Also, to withstand the pressure fluctuations in certain transient conditions, the normal operation of the seal unit. 因此对密封件的密封性能提出了很高的要求,这些要求是常规密封件所不能满足的。 Thus sealing performance of the seal is made high requirements that conventional seals can not be met. 此外,压力容器内的冷却剂具有高放射性,如果发生泄漏将会严重威胁社会的安全。 In addition, the coolant in the pressure vessel is highly radioactive, if the leak will be a serious threat to the security of society.

[0005] 因此,有必要研制一种国产化的能够适应核电站高温、高压以及瞬时大温差、压力波动工况的密封件,保证反应堆压力容器的密封性能,以保证核电站的安全运行,同时降低成本。 [0005] Accordingly, it is necessary to develop a domestic nuclear power plant can be adapted to high temperature, high pressure and high instantaneous temperature, pressure fluctuation condition of the seal, to ensure the sealing performance of the reactor pressure vessel, in order to ensure the safe operation of nuclear power plants, while reducing costs .

发明内容 SUMMARY

[0006] 本发明的目的在于提供一种国产化的能够适应核电站高温、高压以及瞬时大温差、压力波动工况的密封环,保证反应堆压力容器的密封性能,以保证核电站的安全运行,同时降低成本。 [0006] The object of the present invention is to provide a localization of the nuclear power plant can be adapted to high temperature, high pressure and high instantaneous temperature, pressure fluctuation condition of the sealing ring to ensure sealing performance of the reactor pressure vessel, in order to ensure the safe operation of nuclear power plants, while reducing cost.

[0007] 为实现上述目的,本发明的技术方案为:提供一种反应堆压力容器用密封环,所述密封环呈圆环状,所述密封环包括呈中空圆环状的包覆层、中间层及内置层,所述中间层容置于所述包覆层的中空结构内且紧贴所述包覆层的内壁,所述内置层容置于所述中间层的中空结构内并紧贴所述中间层的内壁,且所述包覆层、所述中间层及所述内置层的截面均呈C形结构,其中,所述内置层为通过一呈圆柱形的丝材绕制形成的呈圆环状的螺旋并紧弹簧,所述螺旋并紧弹簧的首尾相焊接,且所述螺旋并紧弹簧紧贴于所述中间层的内壁后,所述螺旋并紧弹簧与所述中间层的内壁之间还具有空隙,且所述丝材为镍基高温合金材质,所述镍基高温合金中钴的质量百分比含量小于等于0.1%,铜的质量百分比含量小于等于0.2%O [0007] To achieve the above object, the technical solution of the present invention is: a reactor pressure vessel to provide a seal ring, said seal ring annular shape, the seal ring comprises a hollow annular cladding layer, an intermediate layer and the build-up layers, said intermediate layer against the inner wall of the container and disposed within the cladding layer of the coating layer hollow structure, and the built-in against the inner layer of the intermediate layer is accommodated in a hollow structure an inner wall of said intermediate layer and said cladding layer, said intermediate layer and said build-up layers showed a cross-sectional C-shaped structure, wherein the layer is built by a cylindrical forming wire wound and a circular annular coil garter spring, and said coil spring is tightly welded end to end, and the coil spring tightly and closely attached to the inner wall of the intermediate layer, and the coil spring and the intermediate layer immediately further having a gap between the inner wall and the wire material is a nickel-base superalloy, the mass percent content of cobalt in the nickel-base superalloy is 0.1% or less, by mass percentage of copper content less 0.2% O

[0008] 较佳地,所述镍基高温合金丝材的晶粒度等级大于等于5级。 [0008] Preferably, the grain size of the nickel-base superalloy grade wire is not less than 5 stages.

[0009] 较佳地,所述中间层通过一镍铬铁合金材质的带材成型,所述带材的首尾相焊接,其中,所述镍铬铁合金中钴的质量百分比含量小于等于0.1%,铜的质量百分比含量小于等于0.2%O [0009] Preferably, the intermediate layer is formed by a nichrome strip shaped material, the belt material is welded end to end, wherein the nichrome mass content percentage of 0.1% or less of cobalt, copper mass percentage content less 0.2% O

[0010] 较佳地,所述镍铬铁合金带材的晶粒度等级大于等于5级。 [0010] Preferably, the grain grade nichrome strip is greater than or equal to level 5.

[0011] 较佳地,所述包覆层通过银带成型,所述银带的首尾相焊接,且所述银带中银的纯度大于等于99.99%。 Purity [0011] Preferably, the silver coating layer by tape casting, welded end to end with the silver, and the silver in the silver band greater than or equal to 99.99%.

[0012] 较佳地,所述密封环的有效回弹量大于等于0.20毫米,且所述密封环的总回弹量大于等于0.25毫米。 [0012] Preferably, the effective resilient seal ring is greater than equal to 0.20 mm and the total resilient seal ring is greater than or equal 0.25 mm.

[0013] 较佳地,所述密封环承受的升降温速率大于等于28°C /h。 [0013] Preferably, the seal ring is subjected to heating and cooling rates not less than 28 ° C / h.

[0014] 较佳地,升降温过程中,所述密封环的泄漏率小于等于0.lL/h;温度、压力稳定时,所述密封环无泄漏。 [0014] Preferably, the heating and cooling process, the ring seal leak rate is less than or equal 0.lL / h; temperature, pressure stability, the seal ring without leakage.

[0015] 较佳地,所述包覆层沿其周向开设有第一开口,所述中间层沿其周向开设有第二开口,所述第一开口与所述第二开口相对应并连通。 [0015] Preferably, the coating layer along a circumferential direction defines a first opening, the intermediate layer along a circumferential direction defines a second opening, the first opening and the second opening and corresponding connectivity.

[0016] 与现有技术相比,由于本发明的反应堆压力容器用密封环,其包括呈中空圆环状的包覆层、中间层及内置层,所述中间层容置于所述包覆层的中空结构内且紧贴所述包覆层的内壁,所述内置层容置于所述中间层的中空结构内并紧贴所述中间层的内壁,且所述包覆层、所述中间层及所述内置层的截面均呈C形结构,其中,所述内置层为通过一呈圆柱形的丝材绕制形成的呈圆环状的螺旋并紧弹簧,所述螺旋并紧弹簧的首尾相焊接,且所述螺旋并紧弹簧紧贴于所述中间层的内壁后,所述螺旋并紧弹簧与所述中间层的内壁之间还具有空隙,且所述丝材为镍基高温合金材质,所述镍基高温合金中钴的质量百分比含量小于等于0.1%,铜的质量百分比含量小于等于0.2%。 [0016] Compared with the prior art, since the reactor pressure vessel according to the present invention a sealing ring comprising a hollow annular cladding layer, an intermediate layer and disposed layer, the intermediate layer is accommodated in the cover and close to an inner wall of said inner cladding layer hollow structure, an inner wall of the build-up layers and housed in the intermediate layer against the inner hollow structure of the intermediate layer and the coating layer, the built-in section of the intermediate layer and the layer showed C-shaped structure, wherein the layer is a built-in annular shape by a cylindrical wire coil wound and formed tight spring, said coil spring tightening and welded end to end, and the coil spring tightly and closely attached to the inner wall of said intermediate layer, said coil having a gap between an inner wall and further tightening the spring and the intermediate layer, and the nickel-based wire high temperature alloy, the mass percent content of cobalt in the nickel-base superalloy is 0.1% or less, by mass percentage content of copper is 0.2% or less. 工作时,密封环在螺栓预紧力作用下呈压紧状态,其与密封面紧密贴合起到密封作用;当介质压力或/和温度出现变化时,由螺旋并紧弹簧的压缩-回弹特性保持密封性能的稳定性,从而保证反应堆压力容器的密封性能,确保核电站的安全运行,并能够适应核电站高温、高压以及瞬时大温差、压力波动工况,同时采用国产化的原材料生产所述密封环,不仅能大幅降低密封环的生产成本,且对中国核电国产化进程具有重要的战略意义。 In operation, the sealing ring in the form of bolt preload force of the compressed state, which is in close contact with the sealing surface of the sealing function; when the fluid pressure and / or temperature changes, and by a helical compression spring is tight - Rebound sealing performance characteristics remain stable, thus ensuring the sealing performance of the reactor pressure vessel, to ensure safe operation of nuclear power plants, nuclear power plants and can adapt to high temperature, high pressure and high instantaneous temperature, pressure fluctuation condition, while use of domestic raw materials of the seal ring, not only can significantly reduce the production costs of the sealing ring, and has important strategic significance for Chinese nuclear power localization process.

附图说明 BRIEF DESCRIPTION

[0017] 图1是本发明密封环的结构示意图。 [0017] FIG. 1 is a structural diagram of the present invention, the sealing ring.

[0018] 图2是沿图1中AA线的剖视图。 [0018] FIG. 2 is a sectional view along line 1 AA in FIG.

[0019] 图3是沿图2中BB线的剖视图。 [0019] FIG. 3 is a sectional view taken along line BB in FIG. 2. [0020] 图4是本发明密封环的压缩-回弹特性曲线图。 [0020] FIG. 4 is a compression of the sealing ring of the present invention - FIG rebound characteristic.

[0021] 图5是装设有本发明密封环的反应堆压力容器的剖视图。 [0021] FIG. 5 is a cross-sectional view of a sealing ring of the reactor pressure vessel mounted with the present invention.

[0022] 图6是图5中A部分的放大示意图。 [0022] FIG. 6 is an enlarged view of part A in FIG. 5.

[0023] 图7是图6中B部分的放大示意图。 [0023] FIG. 7 is an enlarged schematic view of part of FIG. 6 B.

具体实施方式 detailed description

[0024] 现在参考附图描述本发明的实施例,附图中类似的元件标号代表类似的元件。 [0024] Referring now to the accompanying drawings of embodiments of the present invention, the accompanying drawings in which like numerals represent like element elements throughout. 本发明提供的国产化的密封环1,能够适应核电站高温、高压以及瞬时大温差、压力波动工况,保证反应堆压力容器的密封性能,以确保核电站的安全运行,同时降低成本。 The present invention provides the localization of a sealing ring 1, it is possible to adapt nuclear power plant a high temperature, high pressure and high instantaneous temperature, pressure fluctuation condition to ensure the sealing performance of the reactor pressure vessel, to ensure safe operation of nuclear power plants, while reducing costs.

[0025] 如图1所示,本发明所提供的反应堆压力容器用密封环1,其呈圆环状,且本发明密封环I为大直径密封环,优选地,本发明所述密封环I主要是直径为3983.lmm、4071.1mm两种型号的密封环。 [0025] As shown in FIG. 1, the present invention provides a reactor pressure vessel 1 with a sealing ring which is annular, and the seal ring of the present invention I is a large diameter ring seal, preferably the seal ring of the present invention, I mainly diameter 3983.lmm, 4071.1mm two types of sealing rings.

[0026] 如图1-图3所示,所述密封环I包括呈中空圆环状的包覆层11、中间层12及内置层13,所述中间层12容置于所述包覆层11的中空结构内且紧贴所述包覆层11的内壁,所述内置层13容置于所述中间层12的中空结构内并紧贴所述中间层12的内壁,且所述包覆层11、所述中间层12及所述内置层13的截面均呈C形结构(见图2),故本发明密封环I又称为C型密封环。 [0026] As shown in FIG. 1 to FIG. 3, the seal ring I comprises a hollow annular cladding layer 11, the intermediate layer 12 and the build-up layers 13, the intermediate layer 12 accommodated in the cladding layer the hollow structure 11 and close to the inner wall 11 of the coating layer, the build-up layers 13 accommodated in close contact with an inner wall of said intermediate layer and the intermediate layer 12 within the hollow structure 12, and the coating layer 11, the intermediate layer 12 and a cross section showed a C-shaped configuration (see FIG. 2), so that the present invention is a sealing ring I is also known as the C-ring seal 13 is disposed layer.

[0027] 本发明所述密封环1,中间层12紧密地包覆于内置层13夕卜,中间层12用于隔离介质与环境,起到密封作用;包覆层11紧密地包覆于中间层12外,包覆层11具有高塑性从而使其与中间层12的密封面接触时起到弥合作用。 [0027] The seal ring 1 according to the present invention, the intermediate layer 12 tightly covering the built-Bu Xi layer 13, intermediate layer 12 for isolating the medium and the environment, the sealing function; close to the cladding layer 11 covering the intermediate an outer layer 12, the cladding layer 11 having a high plasticity so that it plays the role of bridging contact with the sealing surface of the intermediate layer 12. 具体地,所述包覆层11沿其周向开设有第一开口111,所述中间层12沿其周向开设有第二开口121,包覆层11包覆于中间层12外后,所述第一开口111与所述第二开口121相对应并连通成一个整体的开口(见图2);因此,所述包覆层11、所述中间层12的截面均呈C形结构;密封环I安装后,第一开口111与所述第二开口121位于密封环I的承压侧相对面(详见后述),用以适应介质工况变化时密封面的形变。 Specifically, after the coating layer 11 defines a first opening 111 to the circumferential direction thereof, the intermediate layer 12 along a circumferential direction defines a second opening 121, the cladding layer 11 coated on the outer intermediate layer 12, the said first opening 111 and second opening 121 corresponding to the communication and opening into a whole (see FIG. 2); Thus, the coating layer 11, the intermediate layer 12 showed a cross-sectional C-shaped configuration; seal I install the ring, the first opening 111 located on the pressure side seal ring facing surface I (described in detail later) to the second opening 121, to accommodate the change in strain at the sealing surface of the medium conditions.

[0028] 如图2、图3所示,所述内置层13是通过一呈圆柱形的丝材绕制形成的呈圆环状的螺旋并紧弹簧,所述螺旋并紧弹簧的首尾相焊接;因此,内置层13的截面呈C形结构。 [0028] As shown in FIG 2, FIG. 3, the layer 13 is built by a circular annular cylindrical shape wire wound coil formed welded end to end and tightening spring, and said coil spring is tightly ; Thus, layer 13 is a sectional built C-shaped configuration. 螺旋并紧弹簧容置于中间层12后,所述螺旋并紧弹簧紧贴于所述中间层12的内壁;但由于螺旋并紧弹簧是由呈圆柱形的丝材绕制形成的,因此,其外表面呈波纹状,而并非为光滑的曲面,所以所述螺旋并紧弹簧的外表面与所述中间层12的内壁之间还具有一定空隙14(见图3)。 And immediately after the coil spring is received in the intermediate layer 12, and the coil spring tightly against the inner wall of the intermediate layer 12; however, since the coil spring is a tight and cylindrical formed of wound wire, and therefore, its outer surface is corrugated, rather than a smooth curved surface, and so that the coil spring is tightened to the outer surface of the intermediate layer also has a certain gap 14 (see FIG. 3) between the inner wall 12.

[0029] 本发明中,所述螺旋并紧弹簧采用镍基高温合金材质的丝材绕制形成,所述镍基高温合金中,钴的质量百分比含量小于等于0.1%,铜的质量百分比含量小于等于0.2%,且所述镍基高温合金丝材的晶粒度等级大于等于5级。 [0029] In the present invention, the use of the coil spring and the tightening wire nickel-base superalloy materials wound is formed, the nickel-base superalloy, the mass percent content of cobalt is 0.1% or less, by mass percentage content of copper is less than equal to 0.2% and the die nickel-base superalloy grade wire is not less than 5 stages. 优选地,所述丝材的材质为GH4145合金,GH4145合金主要是以Y丨相进行时效强化的镍基高温合金,其在980°C以下具有良好的耐腐蚀和抗氧化性能,在800°C以下具有较高的强度,在540°C以下具有较好的耐松弛性能,同时还具有良好的成形性能和焊接性能。 Preferably, the wire material is an alloy GH4145, GH4145 alloy mainly Shu Y phase age strengthening Ni-base superalloy having good corrosion and oxidation resistance at 980 ° C or less, at 800 ° C or less has high strength, has good resistance to relaxation resistance 540 ° C or less, while also having good formability and weldability. 该合金主要用于制造在800°C以下工作并要求强度较高的耐松弛的平面弹簧和螺旋弹簧。 The alloys are mainly used in the manufacturing work to 800 ° C and requires high strength and relaxation resistance planar spring coil spring. 因此,采用该材质的丝材制造本发明螺旋并紧弹簧,其具有良好的回弹特性,从而提升密封性能。 Therefore, the wire material for producing the helical spring of the present invention is compact, which has good resilient properties, thereby enhancing sealing performance. [0030] 另外,本发明中镍基高温合金丝材在用于绕制螺旋并紧弹簧以前,需要对其进行涡流检测,以保证丝材及螺旋并紧弹簧的质量。 [0030] Further, the present invention is a nickel-based superalloy used in the wire coil and tightly wound spring before the eddy current needs to be detected, and the coil wire to ensure the quality and tight spring.

[0031] 本发明所述中间层12通过一镍铬铁合金材质的带材制成,所述带材的首尾相焊接,从而使整根带材只有一个焊接接头。 [0031] The present invention, the intermediate layer 12 by a tape made of nichrome material, welded end to end of the tape material, so that the entire root only a strip welded joint. 其中,在镍铬铁合金中,钴的质量百分比含量小于等于0.1%,铜的质量百分比含量小于等于0.2%,且所述镍铬铁合金带材的晶粒度等级大于等于5级。 Wherein the nichrome, the mass percent content of cobalt is 0.1% or less, by mass percentage content of copper is 0.2% or less, and the grain size level nichrome strip is greater than or equal to level 5. 优选地,中间层12采用GH600带材制成;GH600带材形成圆环状后,再将带材的两端焊接,因此整根带材只有一个焊接接头。 Preferably, the intermediate layer 12 is made strip GH600; GH600 rear annular strip formed, and then both ends with solder material, so that only a whole root strips welded joint. 由于GH600合金是镍-铬-铁基固溶强化合金,因此具有良好的耐高温腐蚀和抗氧化性能,并具有优良的冷热加工和焊接性能,其在7000C以下具有满意的热强性和高塑性,因此,中间层12起到很好的隔离介质与环境的作用,起到良好的密封作用。 Since GH600 alloy is a Ni - Cr - Fe alloy based solid solution strengthening, thus having good high temperature corrosion and oxidation resistance, and has excellent weldability and cold working, having a satisfactory heat resistance and high strength at 7000C or less plastic, and therefore, the intermediate layer 12 functions as a very good separation medium and the environment, play a good sealing effect.

[0032] 优选地,所述包覆层11通过银带制成,所述银带的首尾相焊接,因此,整根银带只有一个焊接接头。 [0032] Preferably, the coating layer 11 formed by silver with a silver band welded end to end, therefore, the whole root of a welded joint only with silver. 且银带中银的纯度大于等于99.99%,并要求银有非常低的含气量。 And the purity of silver in the silver band greater than or equal to 99.99%, and requires a very low silver-containing gas. 由于银的硬度小于镍铬铁合金的硬度,因此,包覆层11具有高塑性,从而使其与中间层12的密封面接触时起到较好的弥合作用。 A hardness less than the hardness of the silver nichrome, and therefore, the clad layer 11 having a high plasticity, and thus play a role so as to bridge a better contact with the sealing surface of the intermediate layer 12.

[0033] 本发明所述密封环I的包覆层11通过银带制成,中间层12通过镍铬铁合金材质的带材制成,内置层13采用GH4145合金制成,包覆层11、中间层12及内置层13均采用国产材料制成,相较于现有技术中采用国外材料来制备的密封环,生产成本大幅降低。 [0033] I of the present invention, the seal ring 11 with a cladding layer formed by silver, the intermediate layer 12 is formed by nichrome strip material, the build-up layers 13 made of GH4145 alloy clad layer 11, the intermediate layer 12 and the layer 13 are made with built-in domestic materials, the use of foreign material prepared sealing ring compared to the prior art, significantly reduce production costs.

[0034] 为检验本发明密封环I的力学性能和密封性能,还需对本发明密封环I进行载荷-位移特性曲线测定试验及大温差梯度热循环试验,下面分别进行说明。 [0034] In order to test the mechanical properties of the present invention, the sealing ring and the sealing performance of the I, need to be a load of the seal ring of the present invention, I - displacement curve measurement test and the temperature difference between the heat cycle test gradients, are described separately below.

[0035] 参阅图4所示,为了检验本发明密封环I的压缩性和回弹性,需要对所述密封环I进行载荷-位移特性曲线测定试验;通过C型密封环I进行载荷-位移特性曲线试验,可以测得密封环I的压缩量和回弹量。 [0035] Referring to Figure 4, in order to examine and compress resilient seal ring I of the present invention, the need for the sealing ring I is a load - displacement curve measurement test; load carried by the C-seal ring I - displacement characteristic curve test, can measure the amount of compression and the sealing ring I of springback.

[0036] 如图4所示的密封环I的压缩-回弹特性曲线中,当达到初始密封状态时,密封环I的压缩量为此时密封环I所必需的单位长度上的紧固载荷为YtlNAim ;当密封环I保持密封状态,且呈压缩状态时,密封环I的最佳压缩量(即,工作点压缩量)为e2mm,对应地,此时密封环I单位长度上的紧固载荷为Y2N/mm ;而密封环I保证密封状态的极限压缩量为ec mm ;在e0-e2组成的区间内,氦真空随机单孔漏率小于1.33X l(T9Pa.m3/s。 [0036] As shown in FIG. 4 the sealing ring compressed I - rebound characteristic curve, when the seal reaches the initial state, the amount of compression of the sealing ring at this time I tightening load per unit length of the sealing ring necessary I is YtlNAim; I when the seal ring remains sealed state and a compressed state, the optimal amount of compression of the sealing ring I (i.e., the amount of compression work point) is e2mm, correspondingly, when the fastening ring on the sealing unit length I load of Y2N / mm; I guarantee the seal ring sealed state limit compression of ec mm; in the section e0-e2 consisting of helium leak rate less than the vacuum hole random 1.33X l (T9Pa.m3 / s.

[0037] 另外,从上述压缩-回弹特性曲线中还可看到,从压缩状态e2处卸载至密封失效时,密封环I对应的压缩量为eimm,相应地,此时密封环I单位长度上的紧固载荷为Y1N/mm ;而当密封环I卸载至零时,密封环I对应的永久变形量为el'mm ;本发明密封环I的压缩-回弹特性为:有效回弹量L1 (即e2-ei)大于等于0.20毫米,且所述密封环I的总回弹量L2 (即e2-ei' )大于等于0.25毫米。 [0037] Further, from the compression - rebound characteristic curve can also be seen, is unloaded from the compressed state to the sealing failure e2, corresponding to the amount of compression of the sealing ring EIMM I, respectively, when the sealing ring unit length I the tightening load is Y1N / mm; I unloaded when the sealing ring to zero, the amount of permanent deformation of the sealing ring I corresponds el'mm; I seal ring of the present invention, compression - rebound characteristics: an effective amount of springback L1 (i.e., e2-ei) not less than 0.20 mm, and the total amount of springback of the seal ring I L2 (i.e., e2-ei ') greater than or equal 0.25 mm.

[0038] 另外,为了验证C型密封环I在实际使用工况下的性能,还需对密封环I进行大温差梯度热循环试验。 [0038] Further, in order to verify the C-ring seal in the actual use conditions I performance, the need for a large temperature difference between the sealing ring I gradient heat cycle test. 根据实际核电站一回路的热力工况和反应堆压力容器中密封环I的安装结构,对密封环I进行大温差梯度热循环试验时,最高压力为15.5MPa,最高温度为343±5°C,循环次数≤30次,升降温速率≥28 C /h。 The nuclear power plant during the actual thermal condition of a loop reactor pressure vessel and the seal ring mounting structure I, the sealing ring I is a gradient of the temperature difference between the heat cycle test, the maximum pressure of 15.5MPa, a maximum temperature of 343 ± 5 ° C, cycle ≤30 number of times, the ramp rate ≥28 C / h. 试验时,在升降温过程中,泄漏率必须(0.lL/h;当温度、压力均稳定时,密封环I不发生任何泄漏和异常现象,这样密封环I才覆合验收标准。因此,本发明密封环I所能承受的升降温速率> 28°c。 During the test, the heating and cooling process, the leak rate must (0.lL / h; when the temperature and pressure were stable, without any leakage of the sealing ring I and abnormal phenomenon, so that only the sealing ring I overbite Thus acceptance criteria. I seal ring of the present invention can withstand heating and cooling rates> 28 ° c.

[0039] 下面参阅图5-图7所示,对本发明密封环I的具体应用进行说明。 [0039] Next, referring to FIGS. 5 to 7, the seal ring of the present invention will be described with particular application I. [0040] 如图5所示,核电站反应堆压力容器2包括筒体21和顶盖22,其中,筒体21设置有冷却剂进出口管嘴212,且筒体21的上端设置有筒体法兰211,顶盖22上设置有与筒体法兰211相对应的顶盖法兰221,筒体21和顶盖22通过筒体法兰211、顶盖法兰221相密封连接,且筒体法兰211、顶盖法兰221之间设置有至少一道密封环I。 [0040] 5, the nuclear reactor pressure vessel 2 comprises a cylindrical body 21 and a cap 22, wherein the cylindrical body 21 is provided with a coolant nozzle outlet tubes 212, and the upper end of the cylindrical body 21 is provided with a cylindrical flange 211 is provided on the top cover and the cylinder 22 has a flange 211 corresponding to the flange 221 of the cap, the cylindrical body 21 and cap 22 211, the cap flange 221 is connected through the barrel with the sealing flange, and the process cartridge LAN 211, is provided with at least one sealing ring between the cap flange 221 I.

[0041] 参阅图5-图7所示,本实施例中,筒体法兰211、顶盖法兰221之间设置有两道密封环I。 [0041] Referring to FIGS. 5-7, the present embodiment, the cylinder flange 211, a seal ring disposed between the cap flange prescribe 221 I. 具体地,在顶盖法兰221上开设有与密封环I相对应的容置槽222,密封环I对应容置于所述容置槽222内,且在容置槽222的一侧还设置有固定件3以固定密封环I。 In particular, the sealing ring I defines a corresponding receiving groove on the cover flange 221,222, the contents corresponding to the sealing ring I in the accommodating groove 222, and is provided at one side of the receiving groove 222 a fixing member to fix the seal ring 3 I. 其中,固定件3包括紧固螺钉31及固定夹32,固定夹32具有一固定部321,从固定部321的一端弯折延伸形成一夹持部322,固定部321通过紧固螺钉31固定于顶盖法兰221上,夹持部322向容置槽222内延伸并抵压于密封环I的外壁上,且密封环I上的第一开口111、第二开口121位于远离夹持部322的一侧,也即第一开口111、第二开口121位于承压侧的相对面。 Wherein the fixing member 3 comprises a fastening screw 31 and the retaining clip 32, the fixing clip 32 has a fixing portion 321, from one end of the fixed portion 321 is bent to form a clamping portion 322 extending, fixed portion 321 is fixed to the fastening screw 31 the cover flange 221, clamping portion 322 extending into the receiving groove 222 and pressed against the outer wall of the sealing ring I, and sealing the first opening 111 in the ring I, a second opening 121 located remote from the clamping portion 322 side, i.e., the first opening 111, opposite side of the second opening 121 is located in pressure. 工作时,密封环I在螺栓预紧力作用下呈现压紧状态,与密封面紧密贴合起到密封作用;当介质压力或/和温度出现变化时,由内置的螺旋并紧弹簧的压缩-回弹特性保持密封性能的稳定性。 In operation, the sealing ring I presented in bolt preload force of the pressing state, the sealing surface in close contact with the sealing function; when the fluid pressure and / or temperature changes, and the spring is compressed by the tight spiral built - rebound characteristics remain stable sealing properties.

[0042] 本发明所述压力容器2长期工作在高温(一般为310°C )、高压(一般为343°C )工况下,还会有短时的压力波动,机组启停堆时,密封环I能承受升/降温速率28°C /h的大温差作用,并能承受128°C瞬态温差的大温差作用,密封环I的存在很好的实现了反应堆压力容器2的密封作用。 When [0042] the present invention, the long-term pressure vessel 2 at a high temperature (typically 310 ° C), high pressure (typically 343 ° C) condition, there will be a short-term pressure fluctuations, unit commitment stack, sealing ring I can withstand l / cooling rate of 28 ° C / h to effect large temperature difference, 128 ° C and can withstand large temperature difference between the transient temperature difference effect, the presence of the sealing ring I to achieve a good sealing effect of the reactor pressure vessel 2.

[0043] 由于本发明的反应堆压力容器用密封环1,其包括呈中空圆环状的包覆层11、中间层12及内置层13,所述中间层12容置于所述包覆层11的中空结构内且紧贴所述包覆层11的内壁,所述内置层13容置于所述中间层12的中空结构内并紧贴所述中间层12的内壁,且所述包覆层11、所述中间层12及所述内置层13的截面均呈C形结构,其中,所述内置层13为通过一呈圆柱形的丝材绕制形成的呈圆环状的螺旋并紧弹簧,所述螺旋并紧弹簧的首尾相焊接,且所述螺旋并紧弹簧紧贴于所述中间层12的内壁后,所述螺旋并紧弹簧与所述中间层12的内壁之间还具有空隙,且所述丝材为镍基高温合金材质,所述镍基高温合金中钴的质量百分比含量小于等于0.1%,铜的质量百分比含量小于等于0.2%。 [0043] Since the sealing ring 1, which comprises a hollow annular cladding layer 11, the intermediate layer 12 and the layer 13 built in the reactor pressure vessel of the present invention, the intermediate layer 12 accommodated in the cladding layer 11 and the hollow structure against the inner wall 11 of the coating layer, the build-up layers 13 accommodated in close contact with an inner wall of said intermediate layer and the intermediate layer 12 within the hollow structure 12, and the coating layer 11, the cross section of the intermediate layer 12 and the build-up layers 13 showed a C-shaped structure, wherein the layer 13 is built by a circular annular cylindrical shape of the wire forming the coil wound tight and spring , and the coil spring is tightly welded end to end, and the coil spring tightly and closely attached to the inner wall of the intermediate layer 12, and the coil spring and the tightening between an inner wall of the intermediate layer 12 also has a void and said wire is a nickel-based superalloy material, the mass percent content of cobalt in the nickel-base superalloy is 0.1% or less, by mass percentage content of copper is 0.2% or less. 工作时,密封环I在螺栓预紧力的作用下呈压紧状态,其与密封面紧密贴合起到密封作用;当介质压力或/和温度出现变化时,由螺旋并紧弹簧的压缩-回弹特性保持密封性能的稳定性,从而保证反应堆压力容器2的密封性能,确保核电站的安全运行,并能够适应核电站高温、高压以及瞬时大温差、压力波动工况,同时采用国产化的原材料生产所述密封环1,不仅能大幅降低密封环I的生产成本,且对中国核电国产化进程具有重要的战略意义。 In operation, the sealing ring under the action of the form I bolt preload compression state, the close contact with the sealing surface of the sealing function; when the fluid pressure and / or temperature changes, and by a helical compression spring is tight - rebound characteristics remain stable sealing performance, to ensure the sealing performance of the reactor pressure vessel 2, to ensure the safe operation of nuclear power plants, nuclear power plants and can adapt to high temperature, high pressure and high instantaneous temperature, pressure fluctuation condition, while use of domestic production of raw materials the sealing ring 1, not only can significantly reduce the production costs of the sealing ring I, and has a strategic importance for Chinese nuclear power localization process.

[0044] 本发明反应堆压力容器2的其他结构为本领域普通技术人员所熟知,在此不再做详细的说明。 [0044] Other configurations of the reactor pressure vessel 2 of the present invention are known to those of ordinary skill in the art, and will not be described in detail.

[0045] 以上所揭露的仅为本发明的优选实施例而已,当然不能以此来限定本发明之权利范围,因此依本发明申请专利范围所作的等同变化,仍属本发明所涵盖的范围。 [0045] While the invention disclosed above are preferred embodiments only, but not intended to limit the scope of the present invention, the equivalent changes made according to the invention patent application made by the range, still covered by the scope of the present invention.

Claims (9)

  1. 1.一种反应堆压力容器用密封环,所述密封环呈圆环状,其特征在于:所述密封环包括呈中空圆环状的包覆层、中间层及内置层,所述中间层容置于所述包覆层的中空结构内且紧贴所述包覆层的内壁,所述内置层容置于所述中间层的中空结构内并紧贴所述中间层的内壁,且所述包覆层、所述中间层及所述内置层的截面均呈C形结构,其中,所述内置层为通过一呈圆柱形的丝材绕制形成的呈圆环状的螺旋并紧弹簧,所述螺旋并紧弹簧的首尾相焊接,且所述螺旋并紧弹簧紧贴于所述中间层的内壁后,所述螺旋并紧弹簧与所述中间层的内壁之间还具有空隙,且所述丝材为镍基高温合金材质,所述镍基高温合金中钴的质量百分比含量小于等于0.1%,铜的质量百分比含量小于等于0.2%。 A reactor pressure vessel seal ring, said seal ring annular shape, characterized in that: said seal ring comprises a hollow annular cladding layer, an intermediate layer and disposed layer, the intermediate layer container and close to the inner wall of the cladding layer of the coating layer disposed within a hollow structure, and against the inner walls of the built-in-layer intermediate layer intermediate layer is accommodated in the hollow structure, and the cladding layer, the intermediate layer and the built-sectional layer showed a C-shaped structure, wherein the layer is built a circular annular cylindrical shape wire coil formed by winding and tightening spring, and after the coil spring is tightly welded end to end, and the coil spring tightly and closely attached to the inner wall of the intermediate layer, and tightening the spiral spring between the inner wall and the intermediate layer further comprises a void, and the said wire is a nickel-based superalloy material, the mass percent content of cobalt in the nickel-base superalloy is 0.1% or less, by mass percentage content of copper is 0.2% or less.
  2. 2.如权利要求1所述的反应堆压力容器用密封环,其特征在于:所述镍基高温合金丝材的晶粒度等级大于等于5级。 2. The reactor pressure vessel as claimed in claim 1 with a sealing ring, characterized in that: the level of grain size Ni-base superalloy wire is not less than 5 stages.
  3. 3.如权利要求1所述的反应堆压力容器用密封环,其特征在于:所述中间层通过一镍铬铁合金材质的带材成型,所述带材的首尾相焊接,其中,所述镍铬铁合金中钴的质量百分比含量小于等于0.1%,铜的质量百分比含量小于等于0.2%。 A reactor pressure vessel as claimed in claim 1 with a sealing ring, characterized in that: said intermediate layer is formed by a nichrome strip material, welded end to end of the strip, wherein the nickel-chromium mass percent of cobalt iron alloy is less than or equal to 0.1% by mass percentage content of copper is 0.2% or less.
  4. 4.如权利要求3所述的反应堆压力容器用密封环,其特征在于:所述镍铬铁合金带材的晶粒度等级大于等于5级。 The reactor pressure vessel 3, seal ring as claimed in claim 4, wherein: said grain level nichrome strip is greater than or equal to level 5.
  5. 5.如权利要求1所述的反应堆压力容器用密封环,其特征在于:所述包覆层通过银带成型,所述银带的首尾相焊接,且所述银带中银的纯度大于等于99.99%。 A reactor pressure vessel as claimed in claim 1 with a sealing ring, characterized in that: the coating layer is formed by molding with silver, the silver tape welded end to end, and the purity of silver in the silver band of 99.99 %.
  6. 6.如权利要求1所述的反应堆压力容器用密封环,其特征在于:所述密封环的有效回弹量大于等于0.20毫米,且所述密封环的总回弹量大于等于0.25毫米。 1, the reactor pressure vessel 6. A seal ring as claimed in claim, wherein: the effective resilient sealing ring is greater than equal to 0.20 mm and the total resilient seal ring is greater than or equal 0.25 mm.
  7. 7.如权利要求1所述的反应堆压力容器用密封环,其特征在于:所述密封环承受的升降温速率大于等于28°C /h。 7. The reactor pressure vessel according to claim 1 with the seal ring, wherein: said seal ring is subjected to heating and cooling rates not less than 28 ° C / h.
  8. 8.如权利要求1所述的反应堆压力容器用密封环,其特征在于:升降温过程中,所述密封环的泄漏率小于等于0.lL/h;温度、压力稳定时,所述密封环无泄漏。 A reactor pressure vessel as claimed in claim 1 with a sealing ring, characterized in that: heating and cooling process, the ring seal leak rate is less than or equal 0.lL / h; temperature, pressure stability, the seal ring no leaks.
  9. 9.如权利要求1所述的反应堆压力容器用密封环,其特征在于:所述包覆层沿其周向开设有第一开口,所述中间层沿其周向开设有第二开口,所述第一开口与所述第二开口相对应并连通。 Reactor pressure vessel according to claim 1, said seal ring, characterized in that: the coating layer along a circumferential direction defines a first opening, the intermediate layer along a circumferential direction defines a second opening, the said first opening and said second opening corresponding to the communication.
CN 201310616690 2013-11-27 2013-11-27 Sealing ring used for reactor pressure vessel CN103594125A (en)

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