WO2019056151A1 - 套管式流体分流器 - Google Patents

套管式流体分流器 Download PDF

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Publication number
WO2019056151A1
WO2019056151A1 PCT/CN2017/102164 CN2017102164W WO2019056151A1 WO 2019056151 A1 WO2019056151 A1 WO 2019056151A1 CN 2017102164 W CN2017102164 W CN 2017102164W WO 2019056151 A1 WO2019056151 A1 WO 2019056151A1
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WO
WIPO (PCT)
Prior art keywords
joint
container
female thread
sleeve
type fluid
Prior art date
Application number
PCT/CN2017/102164
Other languages
English (en)
French (fr)
Inventor
陈保同
Original Assignee
东莞好奇智能科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 东莞好奇智能科技有限公司 filed Critical 东莞好奇智能科技有限公司
Priority to PCT/CN2017/102164 priority Critical patent/WO2019056151A1/zh
Priority to CN201780094945.6A priority patent/CN111465795A/zh
Publication of WO2019056151A1 publication Critical patent/WO2019056151A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/02—Branch units, e.g. made in one piece, welded, riveted
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe

Definitions

  • the present invention relates to the field of fluid connectors, and in particular to a connection device for dispensing fluid from a main line to a branch.
  • Gas and liquid conveying pipelines are widely used in petroleum, chemical and other industrial fields.
  • the fluid in the main pipe or vessel often needs to be connected to multiple branch lines to distribute fluids to meet industrial needs, to achieve sample testing, fluid performance testing, and heat dissipation.
  • the gas source distributor is the most widely used in the industrial field.
  • Chinese patent CN102788246A discloses a gas source distributor, which is a centrally connected starting instrument connected to the gas main pipe, which can be conveniently controlled. The continuity of each pipeline.
  • the Chinese patent CN104180115A considers that the connection method of the prior patent causes the container wall to be too thick, which causes the entire device to be cumbersome, and thus an improvement has been made to invent a thin-wall type fluid splitter.
  • the fluid shunt disclosed in Chinese Patent No. CN104180115A has a thin wall and a light weight, but the manufacturing process is poor.
  • the insertion pin must be carried out from the inner end of the container, and after the insertion is completed, the container is further processed.
  • the welding of the end caps, the assembly process, the assembly speed is slow, and finally the welding is easily broken, resulting in seal failure and low yield.
  • the object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a cannula type fluid diverter which can achieve a firm connection and a stable seal by using a thin-walled container and a snap-fit connection. Fast processing.
  • a cannula type fluid diverter comprising a container, a plurality of valves, a plurality of sleeves, a plurality of joints, a plurality of fasteners and a plurality of seals;
  • the joint connects the valve to the container;
  • the container includes at least one fluid main passage, and further includes a circular hole disposed on the cylindrical wall of the container and connected to the joint;
  • the sleeve is round tubular, and both ends have a tapered or curved chamfer;
  • the valve controls the continuity of the pipeline , has a thread for connection with the joint a female thread, an annular tapered surface for engaging the end of the sleeve;
  • the joint has a substantially circular tubular shape with a through hole, the first end having an insertion portion for inserting the sleeve, and the end of the insertion portion having a An annular tapered surface that cooperates with the end of the sleeve, and a male thread for screwing with the female thread of the valve
  • the thickness of the thin portion of the fastening member is smaller than the thickness of the female thread portion.
  • the outer diameter of the thin portion is the same as the outer diameter of the female thread portion, and the diameter of the central hole before the thin portion is plasticized is larger than the diameter of the female thread portion.
  • the fastening member is prevented from being loosened in the axial direction, and the outer wall of the thin portion is provided with a grain or a protrusion to increase the friction between the protrusion and the inside of the container.
  • the joint and the fastening component are prevented from loosening axially, and the lower edge of the outer edge portion is provided with a grain or a protrusion, and the annular platform is also provided with a grain or a convex shape.
  • the fluid flow splitter also includes a bleed port for cleaning that is disposed on the container.
  • the sealing method of the joint and the container in the invention is reliable in sealing and the processing process is simple; in addition, the connection manner of the joint and the container adopts a manner of fastening inside the container, and the snap-fit ⁇ only needs to be operated outside the complete container.
  • DRAWINGS 1 is a structural view of a fluid splitter
  • FIG. 2 is an exploded view of a fluid splitter
  • Figure 3 is an axial cross-sectional view of the fastening member
  • Figure 4 is an axial cross-sectional view of the joint
  • FIG. 5 is an axial cross-sectional view of the joint, and FIG. 5 is perpendicular to the cross section of FIG. 4;
  • Figure 6 is an axial cross-sectional view of the sleeve
  • FIG. 7 is a schematic structural view of a clamping device
  • FIG. 8 is a schematic view of the clamping device and the fastening member after being screwed together;
  • FIG. 9 is a schematic view showing the cooperation of the clamping device, the fastening component and the joint;
  • FIG. 10 is a view showing an initial compression state of the fastening device to the fastening member
  • FIG. 11 is an enlarged view of a portion A in FIG. 10;
  • FIG. 12 is a view showing a state in which the clamping device is compressed to the fastening member
  • FIG. 13 is a view showing a state in which a joint is connected to a container
  • FIG. 14 is a partial cross-sectional view of a cannulated fluid diverter.
  • FIGS. 1 to 14 are drawings of a cannula type fluid splitter, a cannula type fluid splitter including a container 10, a plurality of valves, a plurality of sleeves, a plurality of joints, a plurality of fasteners, and a plurality of a joint; the joint 60 connects the valve 60 to the container 10; the container 10 includes a cylindrical intermediate section 11, a gathered front section 12, a gathered rear section 13 , the front section 12 and the rear section 13 pass through the weld 16 and the weld 17 is integrally connected and forms a container having a cavity 19; the front section 12 has a fluid main passage 14 for externally connecting the main pipe, the rear section 13 has a venting port 15, and the middle section 11 has six joints on the cylindrical wall.
  • the circular hole 18; the sleeve 90 has a round tubular shape, and both ends are flush; the valve 60 controls the opening and closing of the pipeline, has a female thread 61 for screwing with the joint, and an annular cone surface for engaging the end of the sleeve 62; the joint 20 is substantially circular in shape, has a through hole, and the first end has a The insertion portion 28 of the insertion sleeve, the end of the insertion portion 28 has an annular tapered surface 27 for engagement with the end of the sleeve, a male thread 22 for screwing with the female thread 61 of the valve, and the female thread 61 is screwed by the valve.
  • the sleeve 90 that is inserted into the insert 28 is axially forced, and the ends of the sleeve 90 are respectively sealed with the annular tapered surface 62 of the valve and the annular tapered surface 27 of the joint.
  • the central hole of the joint 20 penetrates along the joint axial direction to the second end of the joint, and the diameter of the central hole at the second end is smaller than the diameter at the female thread, that is, the diameter at the position 25 is smaller than the diameter at the position 28, so that the center hole is close to the first
  • the two ends form an annular platform 24, and a ring or protrusion is disposed on the annular platform 24, and the second end face 23 of the joint is a circular arc surface corresponding to the radius of the middle portion 11 of the container, and an annular groove 26 is disposed thereon.
  • the circular arc surface can ensure the axial compression compression process of the fastening component 30, and the outer wall of the middle section of the container 1 is naturally plastically abutted with the second end surface 23 without being plasticized.
  • the fastening member 30 includes a female thread portion 33, a thin portion 32, an outer edge portion 31, a protrusion portion 322, and a center hole.
  • the outer diameter of the thin portion 32 is the same as the outer diameter of the female thread portion 33, and the thin portion 32 is molded before The diameter of the central hole is larger than the diameter of the female thread portion, and the wall thickness of the thin portion 32 is smaller than the wall thickness of the female screw portion 33;
  • the inner wall 322 of the thin portion 32 is provided with a guiding groove 323 on the side close to the female screw portion 33, the guiding The groove 323 is a continuous, annular groove, and the guiding groove surrounds the central hole of the thin portion, and the guiding groove 323 has an arc shape;
  • the outer wall of the thin portion 32 is provided with the drawing pattern 321 to improve the fastening member and the container
  • the frictional force of the inner wall, the lower edge 311 of the outer edge portion 31 is provided with a texture to improve the frictional force between the fasten
  • Fig. 7 is a schematic view of a clamping device.
  • the specific mounting method of the joint is as follows: the male thread end 521 of the mandrel 52 of the clamping device 50 is The female thread 332 of the female threaded portion of the fastening member is screwed, and the gathered front end 333 of the fastening member is sequentially passed through the joint 20, the sealing member 40, the circular hole 18, and the annular sealing member 18 is embedded in the recess 26 Inside, the sleeve end portion 511 is abutted against the upper edge 312 of the fastening member, and then the force F1 is applied to the sleeve 51, and the force F2 is applied to the mandrel 52 to axially compress the fastening member.
  • the portion 32 first forms a bulge 324 radially outward at the guiding groove 323, As the axial compression force increases, the bulge 324 pulls the remaining portion of the thin wall portion to continue to bulge outward, forming a protrusion 322. As the forces F1, F2 gradually increase, the protrusion 322 abuts against the inner wall of the container 10 and is pressed.
  • the container is attached to the end face 23 of the joint 20, and finally the mandrel 52 and the female screw portion 33 are rotated, as shown in Fig. 13, to complete the attachment of a joint. Install the remaining connectors in the same way as above. Finally, the screwing of the valve 60 to the joint is screwed, and the sleeve is locked in the insertion portion 28 to achieve a sealed connection between the valve and the container to obtain the fluid flow divider shown in FIG.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

一种套管式流体分流器，包括容器（10）、多个阀门（60）、多个套管（90）、多个接头（20）、多个扣合件（30）和多个密封件（40）；采用扣合件（30）塑性变形将阀门（60）与容器（10）密封连接，密封可靠，产品加工工艺简单。

Description

套管式流体分流器
技术领域
[0001] 本发明创造涉及流体连接件领域， 具体涉及将流体从主管路分配到支路的连接 装置。
背景技术
[0002] 气体、 液体输送管道广泛应用于石油、 化工等工业领域。 在生产应用中， 主管 路或容器内的流体往往需要连接多个支线管路， 用以分配流体， 以满足工业需 求， 实现样本检测、 流体性能指标测试、 循环散热等目的。 气源分配器在工业 领域中应用最为广泛， 中国专利 CN102788246A公幵了一种气源分配器,这种气源 分配器是集中安装的启动仪表与气体总管相连接的中间桥梁， 它可以方便控制 各管路的通断。 中国专利 CN104180115A认为在先专利的连接方式会导致容器壁 过厚， 这就导致整个装置笨重， 因此作出改进， 发明了薄壁型流体分流器。 中 国专利 CN104180115A公幵的这种流体分流器， 容器壁薄、 重量轻， 但是加工制 造工艺欠佳， 在这种装置中， 穿插固定销吋必须从容器内部一端进行， 穿插完 毕后， 再进行容器端盖的焊接， 这种装配工艺， 装配速度慢， 而且最后焊接容 易破坏导致密封失效， 成品率低。
技术问题
[0003] 本发明的目的在于克服上述现有技术的不足， 提供一种套管式流体分流器， 这 种流体分流器采用薄壁容器、 扣合连接就能实现牢固连接和稳定密封， 该装置 加工快捷。
问题的解决方案
技术解决方案
[0004] 一种套管式流体分流器,包括容器、 多个阀门、 多个套管、 多个接头、 多个扣 合件和多个密封件； 接头将阀门与容器贯通连接； ； 所述容器包括至少一个流 体主通道， 还包括设置在容器的圆柱壁上、 与接头连接的圆孔； 套管呈圆管状 ， 两端均具有锥形或弧形倒角； 阀门控制管路的通断， 具有用于与接头螺纹连 接的阴螺纹、 用于与套管端部配合的环形锥面； 接头大致呈圆管状， 具有贯通 的中心孔， 第一端具有用于插接套管的插入部、 插入部的末端具有用于与套管 端部配合的环形锥面、 用于与阀门阴螺纹旋合的阳螺纹， 接头的中心孔沿着接 头轴向贯通至接头第二端， 中心孔在第二端的直径小于阴螺纹处的直径， 使得 中心孔在靠近第二端形成环状平台， 接头第二端端面是与容器壁半径相当的圆 弧面,第二端端面上设置有环形凹槽； 扣合件包括阴螺纹部、 薄壁部、 外沿部、 突起部和中心孔， 扣合件的中心孔贯通阴螺纹部、 薄壁部和外沿部； 扣合件的 阴螺纹部和薄壁部依次穿过接头、 密封件和容器圆孔， 在轴向、 相向方向上的 外力作用下， 薄壁部塑变塌陷、 并向薄壁部径向向外鼓起， 形成突起部， 使扣 合件外沿部的下缘抵顶在接头的环状平台上、 突起部抵顶在环绕圆孔的容器内 壁上， 实现接头与容器形成轴向夹紧， 并将密封件封闭在凹槽内。
[0005] 进一步的， 所述扣合件薄壁部的壁厚小于阴螺纹部壁厚。
[0006] 进一步的， 薄壁部的外部直径与阴螺纹部外部直径相同， 薄壁部塑变前中心孔 直径大于阴螺纹部直径。 这种结构， 在塑变吋， 薄壁部更容易向径向向外鼓起 形成突起部， 而不会径向向内塌陷、 阻碍作为流道的中心孔。
[0007] 进一步的， 为了便于插入接头、 圆孔装配， 阴螺纹部前端呈收拢状。
[0008] 进一步的， 为了提高扣合件与容器内壁的摩擦力， 防止扣合件轴向松动， 在薄 壁部外壁设置有纹路或凸起， 以加大突起部与容器内部的摩擦力。
[0009] 进一步的， 为了提高扣合件与接头的摩擦力， 防止接头与扣合件轴向松动， 外 沿部的下缘设置有纹路或凸起， 环状平台上也设置有纹路或凸起。
[0010] 流体分流器还包括设置在容器上的用于清扫的泄放接口。
发明的有益效果
有益效果
[0011] 本发明中的接头与容器的密封方式密封可靠， 加工工艺简单； 另外， 接头与容 器的连接方式采用了在容器内部扣合的方式， 扣合吋只需在完整的容器外部操 作。
对附图的简要说明
附图说明 [0012] 图 1是流体分流器结构图；
[0013] 图 2是流体分流器爆炸图；
[0014] 图 3是扣合件轴向剖视图；
[0015] 图 4是接头轴向剖视图；
[0016] 图 5是接头轴向剖视图， 图 5与图 4剖面垂直；
[0017] 图 6是套管轴向剖视图；
[0018] 图 7是夹紧设备结构示意图；
[0019] 图 8是夹紧设备与扣合件旋合后的示意图；
[0020] 图 9是夹紧设备与扣合件、 接头配合示意图；
[0021] 图 10是夹紧设备对扣合件初始压缩状态图；
[0022] 图 11是图 10中 A处放大图；
[0023] 图 12是夹紧设备对扣合件压缩完成状态图；
[0024] 图 13是接头与容器连接状态图；
[0025] 图 14是套管式流体分流器局部剖视图。
实施该发明的最佳实施例
本发明的最佳实施方式
[0026] 为了便于理解本发明， 下面结合附图对本发明的具体实施例及装配过程作详细 说明。
本发明的实施方式
[0027] 图 1至图 14是套管式流体分流器相关附图， 套管式流体分流器,包括容器 10、 多 个阀门、 多个套管、 多个接头、 多个扣合件和多个密封件； 接头将阀门 60与容 器 10贯通连接； 容器 10包括圆柱状的中段 11、 收拢状的前段 12、 收拢状的后段 1 3， 前段 12和后段 13通过焊缝 16和焊缝 17连接为一体， 并形成具有空腔 19的容器 ； 前段 12上有用于对外连接主管路的流体主通道 14、 后段 13上有泄放接口 15， 中段 11的圆柱壁上有 6个接头连接的圆孔 18; 套管 90呈圆管状， 两端平齐； 阀门 60控制管路的通断， 具有用于与接头螺纹连接的阴螺纹 61、 用于与套管端部配 合的环形锥面 62; 接头 20大致呈圆管状， 具有贯通的中心孔， 第一端具有用于 插接套管的插入部 28、 插入部 28的末端具有用于与套管端部配合的环形锥面 27 、 用于与阀门阴螺纹 61旋合的阳螺纹 22， 通过旋合阀门阴螺纹 61与接头阳螺纹 2 2的螺纹连接， 插接到插入部 28的套管 90轴向受力， 套管 90两端分别与阀门的环 形锥面 62、 接头的环形锥面 27密封。 接头 20的中心孔沿着接头轴向贯通至接头 第二端， 中心孔在第二端的直径小于阴螺纹处的直径， 即位置 25处的直径小于 位置 28处的直径， 使得中心孔在靠近第二端形成环状平台 24， 并且在环状平台 2 4上设置有纹路或凸起， 接头第二端面 23是与容器中段 11半径相当的圆弧面， 上 面设置有环形凹槽 26。 圆弧面能确保扣合件 30轴向压缩塑变过程中， 容器中段 1 1外壁不塑变就与第二端面 23自然吻合对接。 扣合件 30包括阴螺纹部 33、 薄壁部 32、 外沿部 31、 突起部 322和中心孔， 薄壁部 32的外部直径与阴螺纹部 33外部直 径相同， 薄壁部 32塑变前中心孔直径大于阴螺纹部直径， 薄壁部 32的壁厚小于 阴螺纹部 33壁厚； 薄壁部 32的内壁 322上、 靠近阴螺纹部 33的一侧设置有引导凹 槽 323， 该引导凹槽 323是连续的、 环形凹槽， 且引导凹槽包围薄壁部的中心孔 ， 引导凹槽 323的断面呈弧形； 薄壁部 32外壁设置有拉丝纹 321以提高扣合件与 容器内壁的摩擦力， 外沿部 31的下缘 311设置有纹路以提高扣合件与接头的摩擦 力， 阴螺纹部的前端 333呈收拢状， 扣合件 30的中心孔贯通阴螺纹部 33、 薄壁部 32和外沿部 31 ; 扣合件 30的阴螺纹部 33和薄壁部 32依次穿过接头 20、 密封件 40 和容器圆孔 18， 在轴向、 相向方向上的外力作用下， 薄壁部 32塑变塌陷、 并向 薄壁部径向向外鼓起， 形成突起部 322， 使扣合件外沿部 31的下缘 311抵顶在接 头的环状平台 24上、 突起部 322抵顶在环绕圆孔 18的容器内壁上， 实现接头 20与 容器 10形成轴向夹紧， 扣合件 30塑变吋压迫容器壁也发生塑变， 使容器 10外壁 贴合在接头第二端面 23上， 并将密封件 40封闭在凹槽 26内。
图 8-图 14展示了一个套管式流体分流器的接头安装方式， 图 7是夹紧设备的示 意图， 接头的具体安装方法为： 将夹紧设备 50的芯轴 52的阳螺纹端 521与扣合件 阴螺纹部的阴螺纹 332旋合， 再将扣合件的收拢状前端 333依次穿过接头 20、 密 封件 40、 圆孔 18， 并使圆环形密封件 18嵌入到凹槽 26内， 并使套筒端部 511抵顶 在扣合件的上缘 312， 然后再套筒 51上施加力 Fl、 在芯轴 52上施加力 F2， 以使扣 合件轴向压缩， 薄壁部 32首先在引导凹槽 323处幵始径向向外形成鼓起 324， 随 着轴向压缩力的增大， 鼓起 324牵引薄壁部其余部分继续向外鼓起， 形成突起部 322， 随着力 Fl、 F2逐渐加大， 突起部 322抵顶在容器 10内壁， 并压迫容器贴合 在接头 20的端面 23上， 最后将芯轴 52与阴螺纹部 33旋幵， 如图 13所示， 完成一 个接头的安装。 按照以上相同的方法， 安装剩余的接头。 最后将旋紧阀门 60与 接头的螺纹连接， 使套管紧锁在插入部 28内， 实现阀门与容器的密封连接， 得 到图 1所示的流体分流器。

Claims

权利要求书
[权利要求 1] 套管式流体分流器,其特征是： 包括容器、 多个阀门、 多个套管、 多 个接头、 多个扣合件和多个密封件； 接头将阀门与容器贯通连接； ； 所述容器包括至少一个流体主通道， 还包括设置在容器的圆柱壁上、 与接头连接的圆孔； 套管呈圆管状， 两端均具有锥形或弧形倒角； 阀 门控制管路的通断， 具有用于与接头螺纹连接的阴螺纹、 用于与套管 端部配合的环形锥面； 接头大致呈圆管状， 具有贯通的中心孔， 第一 端具有用于插接套管的插入部、 插入部的末端具有用于与套管端部配 合的环形锥面、 用于与阀门阴螺纹旋合的阳螺纹， 接头的中心孔沿着 接头轴向贯通至接头第二端， 中心孔在第二端的直径小于阴螺纹处的 直径， 使得中心孔在靠近第二端形成环状平台， 接头第二端端面是与 容器壁半径相当的圆弧面,第二端端面上设置有环形凹槽； 扣合件包 括阴螺纹部、 薄壁部、 外沿部、 突起部和中心孔， 扣合件的中心孔贯 通阴螺纹部、 薄壁部和外沿部； 扣合件的阴螺纹部和薄壁部依次穿过 接头、 密封件和容器圆孔， 在轴向、 相向方向上的外力作用下， 薄壁 部塑变塌陷、 并向薄壁部径向向外鼓起， 形成突起部， 使扣合件外沿 部的下缘抵顶在接头的环状平台上、 突起部抵顶在环绕圆孔的容器内 壁上， 实现接头与容器形成轴向夹紧， 并将密封件封闭在凹槽内。
[权利要求 2] 根据权利要求 1所述的套管式流体分流器， 其特征是： 扣合件薄壁部 的壁厚小于阴螺纹部壁厚。
[权利要求 3] 根据权利要求 1所述的套管式流体分流器， 其特征是： 薄壁部的外部 直径与阴螺纹部外部直径相同， 薄壁部塑变前中心孔直径大于阴螺纹 部直径。
[权利要求 4] 根据权利要求 1所述的套管式流体分流器， 其特征是： 扣合件阴螺纹 部前端呈收拢状。
[权利要求 5] 根据权利要求 1所述的套管式流体分流器， 其特征是： 薄壁部外壁设 置有纹路或凸起。
[权利要求 6] 根据权利要求 5所述的套管式流体分流器， 其特征是： 外沿部的下缘 设置有纹路或凸起， 环状平台上也设置有纹路或凸起。
[权利要求 7] 根据权利要求 1所述的套管式流体分流器， 其特征是： 外沿部的下缘 设置有纹路或凸起， 环状平台上也设置有纹路或凸起。
[权利要求 8] 根据权利要求 1所述的套管式流体分流器， 其特征是： 流体分流器还 包括设置在容器上的用于清扫的泄放接口。
PCT/CN2017/102164 2017-09-19 2017-09-19 套管式流体分流器 WO2019056151A1 (zh)

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JP2002106775A (ja) * 2000-09-27 2002-04-10 Nec Corp 分岐管接合構造
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