WO2007022722A1 - Structure de joint annulaire assiste par de la chaleur et possedant une section transversale de forme trapezoidale - Google Patents

Structure de joint annulaire assiste par de la chaleur et possedant une section transversale de forme trapezoidale Download PDF

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Publication number
WO2007022722A1
WO2007022722A1 PCT/CN2006/002157 CN2006002157W WO2007022722A1 WO 2007022722 A1 WO2007022722 A1 WO 2007022722A1 CN 2006002157 W CN2006002157 W CN 2006002157W WO 2007022722 A1 WO2007022722 A1 WO 2007022722A1
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Prior art keywords
annular
section
cross
sectional
trapezoidal
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PCT/CN2006/002157
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English (en)
French (fr)
Inventor
Changxiang Xu
Original Assignee
Zhejiang China Valve Co., Ltd.
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Publication date
Application filed by Zhejiang China Valve Co., Ltd. filed Critical Zhejiang China Valve Co., Ltd.
Priority to US12/064,570 priority Critical patent/US20080231000A1/en
Publication of WO2007022722A1 publication Critical patent/WO2007022722A1/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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing

Definitions

  • This invention relates to conventional fluid seals, and more particularly to sealing between two fluid containment members under thermal cycling conditions. Background technique
  • All fluid containment parts need to be connected or enclosed to withstand pressure.
  • the connection of any pressurized fluid containment should be done in both sealing and fastening, often by welding, threading, flanges, horns, extrusion, etc.
  • the sealing structure often differs depending on the joining method or the fastening method. Welded joints, sealed and fastened by welded metal; sealed threaded joints, sealed and fastened by threaded teeth; tightened threaded connections, fastened by threads or bolts arranged around the fluid passages, An annular gasket or packing between the two end faces of the joint completes the seal. Annular gaskets, often non-metallic, are often crimped into closed chambers formed when two joined metal parts are closed, where higher requirements are required.
  • U.S. Patent No. 6,837,482 discloses a diamond-shaped annular gasket and cavity that attempts to utilize the different temperature coefficients of the material to enhance the sealing of the joint.
  • this patent does not fully disclose the principle of thermal assisted seal compensation, only that the annular non-metallic pad will move radially into its cavity toward the sharp corner of the cavity with temperature changes. In fact, things are not as simple as this.
  • the annular pad whose radius of gyration is being reduced should have a strong, radially retracted into the smaller cavity portion. That is to say, the annular pad should also have sufficient tensile strength to compensate for the reduced cross-sectional area in the radial direction.
  • Patent US683 7482 mounted in the annular chamber of any form of air or paste filler can not seal with the enhanced temperature, because the air or cyclic paste impossible to produce any radial shrinkage force, temperature change is impossible And one-way movement.
  • the valve has a switching element, such as a ball in a ball valve and a gate in a gate valve.
  • the switch element is mounted in the fluid passage, has an open position that allows the medium to flow past, has a closed position that prevents the flow of the medium, and its movement from open to closed and from off to open is through the body.
  • the outer valve stem is realized.
  • the installation or attachment of such valve fluid passages involves complex sealing connections, sometimes using bolted flanges or threaded flange connections, sometimes directly using a tightening threaded connection, covering three basic forms of tightening the threaded connection fluid containment.
  • the heat assisting sealing structure of the present invention is a trapezoidal cross-sectional annular sealing structure comprising an annular cavity having a trapezoidal cross section and an annular pad or packing for sealing the connection of the two fluid receiving members by fastening threads or bolts,
  • the two fluid-receiving members are enclosed by a fastening thread or a bolt, and enclose and enclose the annular gasket or packing of the trapezoidal section in the enclosed annular cavity of the trapezoidal section.
  • the trapezoidal shape of the cross section is reduced inwardly along its radius, and the cross-sectional area of the annular pad is slightly larger than the cross-sectional area of the annular cavity, and the annular cavity is preferentially recessed into one end surface of the two end faces to be connected.
  • the cross-sectional area and radius of gyration of the annular pad will increase or decrease simultaneously with the annular cavity with temperature changes.
  • the cross-sectional area and radius of gyration of the annular pad increase simultaneously with respect to the cavity, it is equivalent to pressing more annular pad material into the smaller cavity, as long as the material strength of the pad is lower than the material strength of the cavity, any The cavity of the cross-sectional shape does not cause sealing problems.
  • the annular pad whose radius of gyration is being reduced should have a strong force and retract into a smaller cavity portion in the radial direction. That is to say, the annular pad should also have sufficient tensile strength to compensate for the reduced cross-sectional area in the radial direction.
  • a specific embodiment of the heat-assisted sealing structure of the present invention is that the annular cavity of the trapezoidal section is made of metal, and the annular pad of the trapezoidal section is made of polytetrafluoroethylene PTFE or the like; another embodiment is a heat-assisted sealing.
  • the structure is arranged between two end faces of the flange to be joined, wherein the flange is connected by bolts or threads; another embodiment is that the heat-assisted sealing structure is arranged on the end face of the externally threaded part or the end face of the part having the internal thread, wherein The two threaded fluid containing members are coupled together by internal and external threaded engagement; another embodiment is the use of a heat assisted sealing structure to achieve a sealed connection of the valve body or valve fluid passageway, the fastening connection being achieved by a thread or flange .
  • Figure 1 is a partial cross-sectional view of a threaded two-piece ball valve body (fluid passage) including two annular trapezoidal annular seal structures of the present invention.
  • Figure la is a partial enlarged view of the annular seal structure of the trapezoidal cross section of Figure 1.
  • Figure 2 is a partial cross-sectional view of a completed one-piece ball valve including a ladder-shaped annular seal structure of the present invention.
  • Figure 3 is an exploded perspective view of Figure 2.
  • Figure 4 is a partial cross-sectional view of a trapezoidal cross-sectional annular gasket taken from the annular seal chamber of the present invention.
  • Figure 5 is a partial cross-sectional view of a pipe union joined by a threaded flange, including a trapezoidal cross-sectional annular seal of the present invention.
  • Figure 6 is a partial cross-sectional view of a pipe union joined by bolt flanges, including a trapezoidal cross-sectional annular seal of the present invention. The best way to implement the invention
  • FIG. 1 is a specific application and arrangement example of a two-body ball valve in a fluid control passage of the illustrated two-piece ball valve, using the trapezoidal-section annular seal structure of the present invention to achieve a sealed connection of two fluid-receiving members.
  • the end of the externally threaded end cap 05 and the internally threaded valve body 01 port each have an annular cavity of trapezoidal cross section and a pad 04 which is enclosed in an annular cavity enclosed by the engagement of the two threaded members.
  • Figure la is a partial enlarged view of the annular seal structure of the trapezoidal section of Figure 1.
  • more annular material such as PTFE
  • the cavity of any cross-sectional shape will be Does not cause sealing problems.
  • the cross-sectional area and the radius of gyration of the annular pad are simultaneously reduced relative to the cavity, as long as the annular pad has sufficient tensile strength, the annular pad that is reducing the cross-sectional area will be retracted along the radius as the radius of gyration is reduced.
  • the smaller portion of the toroidal cavity compensates for the reduced cross-sectional area, thereby keeping the seal of the connection unchanged (see Figure la).
  • FIGS 2 and 3 show the same ball valve, the same one-piece ball valve, in which the same parts use the same part number.
  • this ball valve there is a medium flow control assembly and a stem seal assembly.
  • the flow control assembly is formed by the internal pressure plug 05 engaging the thread of the valve body 01 to fix the switch ball 03 and the valve seat 02 in the valve body.
  • a trapezoidal cross-section annular gasket (M, which is packaged when the two threaded members are engaged, is formed at the end of the inner pressure plug 05 an annular chamber (within the M, is connected to provide a thermally assisted sealing structure is captured in a through hole 03 switches the two valve seats 02 in the ball, the stem can be rotated by 0 or 14 the handle 6 provided on the drive allpass , partial open and fully closed fluid control.
  • the assembly includes a triangular section sleeve post seal and a spherical wedge/wonk mating shoulder seal. Triangular seal
  • the spherical wedge/socket mating pair is composed of a ball wedge shoulder on the valve stem 06 and a spherical seat on the valve body 01. As the triangular seal 09 is pinched against its seat to provide a post seal, the ball wedge shoulder is tensioned against its mating ball seat to provide a shoulder seal.
  • Figure 5 shows a pipe union connected by a threaded flange.
  • Figure 6 shows a pipe union connected by a bolt flange.
  • the two flange ends of the two unions each have a trapezoidal cross section. Sealing structure.
  • the annular cavities of the two illustrated unions are recessed on one end face of the two flange end faces to be joined, but in practice, they can be enclosed by two semi-trapezoidal section annular cavities recessed on both sides.
  • the trapezoidal section annular pad shown in Figure 4 is a trapezoidal section annular pad that is removed from its annular cavity and designated 04 in the other figures.
  • the trapezoid of the present invention can be used in any connection of two fluid containment members connected by bolt flanges (Fig. 6), threaded flanges (Fig. 5) and direct fastening threads (Figs. 1 and 2).
  • the annular sealing structure of the section serves as a heat assisted seal.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Taps Or Cocks (AREA)
  • Gasket Seals (AREA)
  • Sealing Devices (AREA)

Description

梯形截面的环形热助密封结构 技术领域
本发明涉及普通流体密封，特别涉及热循环条件下的两个流体容纳件间 的密封。 背景技术
一切流体容纳件都需要连接起来或封闭起来才能承受压力。 任何受压流 体容纳件的连接都应完成密封和紧固两种连接， 常常通过焊接、 螺紋、 法兰、 喇叭、 挤压等方法来实现。 密封结构往往随连接方法或紧固方法的不同而不 同。 焊接连接， 同时由焊接金属完成密封和紧固； 密封螺紋连接， 同时由螺 牙完成密封和紧固； 紧固螺紋连接， 由布置在流体通道周围的螺紋或螺栓完 成紧固， 由布置在被连接的两个端面间的环形密封垫或填料完成密封。 环形 密封垫， 往往是非金属， 在要求较高的场合， 常常被压封在两个被连金属件 合拢时形成的封闭腔内。 这些非金属和金属材料的热胀冷缩系数往往差异很 大， 在热循环条件下常常引发密封连接失效。 美国专利 US6837482提出了一 种菱形截面的环形密封垫和腔， 试图利用材料的不同温度系数来加强连接的 密封性。 然而， 该专利没能完整地披露热助密封补偿的原理， 只以为， 环形 非金属垫会随温度变化， 简单地径向地相对其容腔运动进入容腔尖角部位。 实际上， 事情并非简单如此。 众所周知， 不管环形垫的材料温度系数比其容 腔的材料温度系数大还是小，在温度变化时， 它们之间的材料温度系数差异， 都会引起环形垫的截面积和回转半径相对其容腔同时增加或同时缩小。 环形 垫的截面积和回转半径相对其容腔同时增加时， 就意味着， 要把较多的环形 垫材料压入较小的容腔内， 只要垫的材料强度低于容腔的材料强度， 任何截 面形状的容腔都不会引发密封问题。 当环形垫的截面积和回转半径相对其容 腔同时缩小时， 为了补偿正在缩小的截面积， 回转半径正在缩小的环形垫应 当有一殷劲， 沿径向内缩入较小的容腔部位， 也就是说， 环形垫还应有足够 的抗拉强度， 才会沿径向内缩补偿其正在缩小的截面积。 装在 US6837482专 利环形腔中的任何形式的空气或膏填料都不可能随温度变化而使密封得到加 强， 因为环状空气或膏根本不可能产生任何径向收缩力， 根本不可能随温度 变化而单向运动。
阀门作为流体传输与控制单元， 有一个开关元， 如球阀中的球， 闸阀中 的闸。 开关元安装在流体通道中， 有一个允许介质流过去的开通位置， 有一 个阻止介质流过去的关闭位置， 其从开到关和从关到开的运动是通过伸到体 外的阀杆来实现的。 这种阀门流体通道的安装或固定涉及复杂的密封连接， 有时使用螺栓法兰或螺紋法兰连接， 有时直接使用紧固螺紋连接， 涵盖了紧 固螺紋连接流体容纳件的三种基本形式。 发明的公幵
本发明的目的是为两个流体容纳件通过紧固螺紋或螺栓的连接提供一个 热助密封结构。
本发明的热助密封结构是一种梯形截面的环形密封结构， 包括一个截面 为梯形的环形腔和环形垫或填料， 用于实现两个流体容纳件通过紧固螺紋或 螺栓的连接的密封， 其特征是所述的两个流体容纳件， 通过紧固螺紋或螺栓 连接在一起时， 围成并把所述梯形截面的环形垫或填料封装在所围成的所述 梯形截面的环形腔内， 所述截面的梯形沿其环绕半径向内缩小， 所述环形垫 的截面积稍稍大于所述环形腔的截面积， 所述环形腔优先凹陷入要被连接的 两个端面的一个端面上。 当环形腔和环形垫的材料热胀冷缩温度系数不一样 时， 不管谁大谁小， 环形垫的截面积和回转半径都将随温度变化相对其环形 容腔同时增加或同时缩小。 环形垫的截面积和回转半径相对其容腔同时增加 时， 就相当于要把较多的环形垫材料压入较小的容腔内， 只要垫的材料强度 低于容腔的材料强度， 任何截面形状的容腔都不会引发密封问题。 当环形垫 的截面积和回转半径相对其容腔同时缩小时， 为了补偿正在缩小的截面积， 回转半径正在缩小的环形垫应当有一股劲， 沿径向内缩入较小的容腔部位， 也就是说， 环形垫还应有足够的抗拉强度， 才会沿径向内缩补偿其正在缩小 的截面积。
本发明的热助密封结构的一个具体实施实例就是梯形截面的环形腔由金 属制成， 梯形截面的环形垫由聚四氟乙烯 PTFE或类似非金属制成； 另一个 具体实施实例就是热助密封结构布置在两个要被连接的法兰端面间， 其中法 兰用螺栓或螺紋连接； 另一个具体实施实例就是热助密封结构布置在有外螺 紋的零件端面或有内螺紋的零件端面， 其中这两个有螺紋的流体容纳件通过 内外螺紋啮合连接在一起； 另一个具体实施实例就是使用热助密封结构实现 阀体或阀门流体通道的密封连接， 其紧固连接通过螺紋或法兰实现的。 附图的简要说明 图 1 是一个螺紋连接的两体式球阀阀体 (流体通道)的局部剖面图， 其中 包括本发明的两个梯形截面的环形密封结构。 图 la是图 1的梯形截面的环形密封结构的局部放大视图。
图 2是一个完整的一体式球阀的局部剖面图， 其中包括本发明的一个梯 形截面的环形密封结构。
图 3是图 2的分解透视图。
图 4是一个从本发明的环形密封腔中取出来的梯形截面的环形密封垫的 局部剖面图。
图 5是一个通过螺紋法兰连接的管活接头的局部剖面图， 其中包括本发 明的一个梯形截面的环形密封结构。
图 6是一个通过螺栓法兰连接的管活接头的局部剖面图， 其中包括本发 明的一个梯形截面的环形密封结构。 实现本发明的最佳方式
图 1是用本发明的梯形截面的环形密封结构， 实现两个流体容纳件密封 连接的具体应用和布置实例； 从图 1可以看出， 在所示的两体式球阀的流体 控制通道中， 有两个梯形截面的环形密封结构； 流体控制通道是， 通过端盖 05同阀体 01的紧固螺紋啮合， 把一个开关球 03和两个阀座 02固定在阅体 01中形成的； 在有外螺紋的端盖 05端头和有内螺紋的阀体 01端口， 各有一 个梯形截面的环形腔和垫 04，环形垫是封装在两个螺紋件啮合时围成的环形 腔内的。 图 la是图 1的梯形截面的环形密封结构的局部放大视图。 当环形垫 的截面积和回转半径， 随温度变化相对其容腔增加时， 相当于更多的环形垫 材料， 如 PTFE, 将被压入较小的环形腔内， 任何截面形状的容腔都不会引发 密封问题。 当环形垫的截面积和回转半径相对其容腔同时缩小时， 只要环形 垫有足够的抗拉强度，正在缩小截面积的环形垫就将随着其回转半径的缩小， 沿着半径内缩入环形容腔的较小部位， 使正在缩小的截面积得到补偿， 借以 保持连接的密封性不发生变化 (参见图 la) .
图 2和 3所显示的都是同一个球阀， 同一个一体式球阀， 其中， 相同的 零件用的是相同的零件号。 在这个球阀中， 有一个介质流动控制总成和一个 阀杆密封总成。 流动控制总成是通过内压塞 05同阀体 01的螺紋啮合， 把开 关球 03和阀座 02固定在阀体中而形成的。随着有外螺紋的内压塞 05同有内 螺紋的阀体 01的螺紋啮合， 一个梯形截面的环形垫（M , 就被封装在这两个 螺紋件啮合时在内压塞 05端头形成的环形腔 (M内， 为连接提供一个热助密 封结构。 被俘获在两个阀座 02 中的开关球 03有一个通孔， 可通过阀杆 06 上的手柄 14或驱动器转动提供全通、部分开通和全闭流体控制。阀杆密封总 成包括一个三角截面套杆柱密封和一个球形楔 /窝配合杆肩密封。三角密封套
09是通过套装在阀杆 06上的套压环 10和碟型垫圈 11及螺母 12同杆 06的 啮合，夹压在阀体 01的杆出口处的套座上而为阀杆提供柱面密封的。球形楔 /窝配合副是由阀杆 06上的一个球楔肩和阀体 01上的一个球形座组成的。随 着三角密封套 09夹压在其座上提供杆柱密封的同时，球楔杆肩被拉紧在其配 合球形座上而提供杆肩密封。
图 5展示的是一个通过螺紋法兰连接的管活接头， 图 6展示的是一个通 过螺栓法兰连接的管活接头， 两个活接头的两个法兰端面间各有一个梯形截 面的环形密封结构。 两个图示的活接头的环形腔都是凹陷在被连接的两个法 兰端面的一个端面上的， 但实际上， 可用凹在两面的两个半梯形截面环形腔 围成。
展示在图 4的梯形截面环形垫，是从其环形腔中取出的在其它图中用 04 标示的梯形截面环形垫。
事实上，可在任何通过螺栓法兰（图 6)、螺紋法兰（图 5)和直接紧固螺紋 (图 1和图 2)连接的两个流体容纳件的连接中， 使用本发明的梯形截面的环 形密封结构作热助密封。

Claims

权 利 要 求
1. 一种梯形截面的环形密封结构，包括一个截面为梯形的环形腔和环 形垫或填料， 用于实现两个流体容纳件通过紧固螺紋或螺栓的连接 的密封， 其特征是所述的两个流体容纳件， 通过紧固螺紋或螺栓连 接在一起时， 围成并把所述梯形截面的环形垫或填料封装在所围成 的所述梯形截面的环形腔内， 所述截面的梯形沿其环绕半径向内缩 小。
2. 一种按权利 1所述的梯形截面的环形密封结构，其特征是所述环形 垫的截面积稍稍大于所述环形腔的截面积。
3. 一种按杈利 1 所述的梯形截面的环形密封结构， 其特征是所述环 形腔完全凹陷在被连接的两个端面的一个端面上。
4. 一种按权利 1 所述的梯形截面的环形密封结构， 其特征是所述环 形腔和垫或填料绕流体通道地布置在两个要被连接的法兰端面间。
5. 一种按杈利 1 所述的梯形截面的环形密封结构， 其特征是所述环 形腔和垫或填料绕流体通道地布置在有外螺紋的零件端面或有内 螺紋的零件端面，其中这两个有螺紋的流体容纳件通过内外螺紋啮 合连接在一起。
6. 一种按权利 1 所述的梯形截面的环形密封结构， 其特征是所述环 形腔和垫或填料绕流体通道布置地实现要被螺紋或法兰连接的阀 体的密封连接。
PCT/CN2006/002157 2005-08-23 2006-08-23 Structure de joint annulaire assiste par de la chaleur et possedant une section transversale de forme trapezoidale WO2007022722A1 (fr)

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US8382067B2 (en) 2013-02-26
CN100513850C (zh) 2009-07-15
WO2007022721A1 (fr) 2007-03-01
US20080231000A1 (en) 2008-09-25
US20080217568A1 (en) 2008-09-11
CN1920363A (zh) 2007-02-28

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