WO2021047671A1 - 采用组合式密封结构的管道补偿器 - Google Patents

采用组合式密封结构的管道补偿器 Download PDF

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Publication number
WO2021047671A1
WO2021047671A1 PCT/CN2020/115049 CN2020115049W WO2021047671A1 WO 2021047671 A1 WO2021047671 A1 WO 2021047671A1 CN 2020115049 W CN2020115049 W CN 2020115049W WO 2021047671 A1 WO2021047671 A1 WO 2021047671A1
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Prior art keywords
ring
packing
metal ring
pressure
metal
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PCT/CN2020/115049
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English (en)
French (fr)
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潘文浩
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江苏永力管道有限公司
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Publication of WO2021047671A1 publication Critical patent/WO2021047671A1/zh

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    • 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
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
    • F16L27/0804—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another
    • F16L27/0808—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/184—Tightening mechanisms
    • F16J15/185—Tightening mechanisms with continuous adjustment of the compression of the packing
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/20—Packing materials therefor
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/26—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings
    • F16J15/28—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings with sealing rings made of metal
    • 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
    • F16L51/00—Expansion-compensation arrangements for pipe-lines

Definitions

  • the invention relates to the technical field of pipeline compensators, in particular to a pipeline compensator adopting a combined sealing structure.
  • Pipeline compensators generally need to use sealing packing to keep the pipeline sealed and prevent medium leakage.
  • the existing sleeve compensator compensates for the displacement of the pipeline through the expansion and contraction of the sliding core tube, and the seal between the sliding core tube and the packing cannot be maintained in a good state for a long time, and leakage is likely to occur after long-term use.
  • a sealed packing cavity is arranged between the inner and outer pipes of the rotating compensator, and the sealed packing is installed in the sealed cavity, and the packing is compressed by the packing gland to achieve sealing.
  • the matching clearance between the rotating parts of the rotating compensator is large, and the relative rotation stability of the inner and outer pipes is poor due to the thrust of the pipeline, and it is easy to produce eccentric deflection of different shafts, which increases the rotation resistance. After a period of use, the sealing performance of the sealing packing will be affected, resulting in sealing failure and leakage. If it is discovered and maintained not in time, it may even cause safety production accidents.
  • the existing pipeline compensator generally uses graphite packing or asbestos packing as the sealing filler, which has a better sealing effect under ordinary working conditions.
  • graphite packing or asbestos packing as the sealing filler, which has a better sealing effect under ordinary working conditions.
  • the assembly gap of the traditional pipeline compensator is usually designed to be close to the outer surface of the inner core tube.
  • the medium will penetrate to the root of the sealing packing along the assembly gap and accelerate the loss and blowing of the sealing packing.
  • Such a design is more likely to cause failure of the "labyrinth effect" that prevents the leakage of the medium, resulting in large loss of the sealing packing of the compensator, easy leakage, and short service life.
  • the purpose of the present invention is to provide a pipeline compensator with a combined sealing structure that has strong high temperature resistance and high pressure performance, good sealing effect, high pressure bearing strength, flexible operation, long service life, and convenient installation.
  • the pipeline compensator adopts a combined sealing structure, including an outer sleeve, a rotating core tube and a packing gland.
  • the rotating core tube is arranged in the outer sleeve.
  • the end surface of the packing gland and the inner surface of the outer sleeve and the outer surface of the rotating core tube constitute the packing.
  • the sealed cavity is provided with a sealing packing.
  • the sealing packing includes a pressure-changeable metal ring and a non-metallic flexible packing.
  • the pressure-changeable metal ring will radially expand and deform under the action of an external force, causing its inner and outer sides It is tightly matched with the side wall of the sealed cavity; at the same time, the pressure-changeable metal ring is tightly combined with the non-metallic flexible packing to achieve a sealing effect.
  • the pressure-changeable metal ring is formed by bending a metal hollow tube, or formed by bending a metal sheet with a semicircular, arc, or V-shaped cross section.
  • the metal hollow tube includes a hollow round tube or an elliptical hollow tube.
  • the pressure-changeable metal ring includes a closed metal ring or a C-shaped metal ring with one side open.
  • the sealing packing includes at least two laminated metal rings and two layers of non-metallic flexible packing.
  • the first pressure-changeable metal ring is formed by bending a metal hollow tube
  • the second pressure-changeable metal ring is formed by bending an arc-shaped or V-shaped metal sheet.
  • the first pressure-changeable metal ring is a closed metal ring welded by a port
  • the second pressure-changeable metal ring is a C-shaped metal ring with an opening on one side.
  • the pressure-changeable metal ring is a copper ring or an aluminum alloy ring
  • the non-metal flexible filler is graphite packing or asbestos packing.
  • the inner wall of the outer sleeve is provided with an inner convex ring
  • the end of the rotating core tube is provided with a stepped outer flange that matches the inner convex ring
  • the outer flange and the inner The assembly gap formed between the convex rings is located in the middle of the bottom of the sealed cavity.
  • the outer flange of the rotating core tube is provided with at least two steps, and a linear metal sealing ring is provided between the side surface of the upper step and the opposite surface of the inner convex ring; the outer sleeve is of integral structure
  • the inner diameter of the end tube of the outer sleeve is equal to the inner diameter of the rotating core tube.
  • the beneficial effect of the present invention is that compared with the prior art, the present invention adopts a soft and easy-stretchable compression-changeable metal ring and a non-metallic flexible packing to be compressed under the action of an external force to form a composite sealing structure, so that the metal ring and the flexible packing are The radial expansion is achieved, and the edges on both sides of the inner and outer sides are closely matched with the side wall of the sealed cavity; at the same time, a linear metal sealing ring is embedded between the side of the outer flange step of the rotating core tube and the opposite surface of the inner convex ring of the outer sleeve.
  • the ring can form a positive correlation self-sealing effect with the change of the pressure of the pipeline medium, so as to further enhance the sealing effect.
  • the pressure variable metal ring When the compensator is working, the pressure variable metal ring is placed at the bottom of the sealed cavity, which can block direct contact between high temperature and high pressure medium and the flexible sealing packing, effectively reducing the loss of the flexible packing, and at the same time achieving the effect of extending the service life of the sealing packing and strengthening the seal.
  • the linear metal sealing ring and the pressure-changeable metal ring form an end face seal under pressure, with low friction and good sealing effect, which is beneficial to the flexible operation of the compensator. It not only forms the end face seal, but also plays the role of anti-falling and anti-friction.
  • the invention has strong high temperature resistance and high pressure performance, good sealing performance, high pressure bearing strength, long service life and convenient installation. It is especially suitable for high temperature and high pressure heat pipe network, safe and reliable to use, and is conducive to energy saving and environmental protection.
  • Fig. 1 is a schematic diagram of the structure of the present invention.
  • a pipeline compensator with a combined sealing structure includes an outer tube 3, a rotating core tube 6 and a packing gland 5.
  • the rotating core tube 6 is set in the outer tube 3, and the end face of the packing gland 5 and the outer shell
  • the inner surface of the tube 3 and the outer surface of the rotating core tube 6 constitute a packing seal cavity, and a seal packing is arranged in the seal cavity.
  • the seal packing includes a pressure-changeable metal ring 1 and a non-metal flexible packing 4, and a pressure-changeable metal ring 1 Under the action of external force, it will produce radial expansion and deformation, so that its inner and outer sides are closely matched with the side wall of the sealed cavity; at the same time, the pressure-changeable metal ring 1 and the flexible packing 4 are tightly combined to achieve the sealing effect.
  • the pressure-changeable metal ring 1 is formed by bending a metal hollow tube, or formed by bending a metal sheet with a semicircular, arc, or V-shaped cross section; the metal hollow tube includes a hollow round tube or an elliptical hollow tube. Pipe; pressure-changeable metal ring 1 includes a closed metal ring welded at the connecting end, or a C-shaped metal ring with one side open.
  • the sealing packing in the sealed cavity of this embodiment includes three-layer modified metal ring 1 and two layers of non-metallic flexible packing 4, the first pressure-changing metal ring is set at the bottom of the sealed cavity, and then the first non-metallic flexible packing in turn , The second pressure-changeable metal ring, the second non-metallic flexible packing, and the third pressure-changeable metal ring.
  • the first pressure-changeable metal ring is formed by bending a metal hollow tube
  • the second pressure-changeable metal ring is formed by bending an arc-shaped metal sheet
  • the third pressure-changeable metal ring is formed by bending a V-shaped metal sheet.
  • the first pressure-changeable metal ring is a closed metal ring welded by a port, and the second and third pressure-changeable metal rings are C-shaped metal rings with one side open.
  • the pressure-changeable metal ring 1 is a copper ring or an aluminum alloy ring, and the flexible packing 4 is a graphite packing or an asbestos packing.
  • the inner wall of the outer sleeve 3 is provided with an inner convex ring 31, the end of the rotating core tube 6 is provided with a stepped outer flange 61 that cooperates with the inner convex ring 31, and a stepped outer flange 61 is formed between the outer flange 61 and the inner convex ring 31.
  • the assembly gap is located in the middle of the bottom of the sealed cavity.
  • the outer flange 61 of the rotating core tube 6 is provided with upper and lower secondary steps, and a linear metal sealing ring 2 is provided between the side surface of the upper step and the opposite surface of the inner convex ring 31.
  • the outer tube 3 of the present invention is a rotary reducing tube with an integral tensile structure, and the inner diameter of the end tube 32 of the outer tube 3 is equal to the inner diameter of the rotating core tube 6.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)
  • Joints Allowing Movement (AREA)

Abstract

采用组合式密封结构的管道补偿器，包括外套管（3）、旋转芯管（6）和填料压盖（5），密封腔内设有密封填料，密封填料包括压变式金属环（1）和非金属柔性填料（4），压变式金属环（1）在外力作用下产生径向扩张和变形，使其内外两侧边与密封腔侧壁紧密配合；压变式金属环（1）与非金属柔性填料（4）紧密结合；压变式金属环（1）由金属空心管弯曲构成，或者由截面为半圆形、弧形、V形的金属片弯曲构成；旋转芯管（6）的台阶形外凸缘（61）的台阶侧面与外套管（3）的内凸环（31）相对面之间嵌设线型金属密封环（2）。

Description

采用组合式密封结构的管道补偿器 技术领域
本发明涉及管道补偿器技术领域，尤其是一种采用组合式密封结构的管道补偿器。
背景技术
管道补偿器一般都需要采用密封填料来保持管道密封，防止介质泄漏。现有的套筒补偿器通过滑动芯管的伸缩补偿管道的位移，滑动芯管与填料之间的密封不能持久保持良好状态，长期使用容易产生泄漏。旋转补偿器的内外管之间设有密封填料腔，密封填料装进密封腔内，通过填料压盖压紧密封填料来实现密封。旋转补偿器的旋转部件之间配合间隙较大，受管道推力作用，内外管相对旋转的稳定性差，易产生不同轴偏心偏转，增加旋转阻力，用于高压管道中容易磨损或被压坏，使用一段时间后即会影响密封填料的密封性能，导致密封失效，出现泄漏。如果发现和维护不及时，甚至会引发安全生产事故。
现有管道补偿器一般采用石墨盘根或石棉盘根作为密封填料，在普通工况下具有较好的密封效果。对于输送高温、高压介质的管道来说，由于管道补偿器不可避免的装配间隙以及传统密封填料强度较低的原因，加上高温、高压介质的作用，盘根材料在补偿器的偏转和位移过程中损耗较大。另一方面，传统管道补偿器的装配间隙通常设计为紧贴内芯管的外表面，工作过程中，介质会沿着装配间隙向密封填料的根部渗透，并使密封填料加速流失和吹散。这样的设计较易引起阻止介质泄漏作用的“迷宫效应”失效，导致补偿器的密封填料损耗大，易泄漏，使用寿命短。
发明内容
本发明的目的是提供一种具有较强耐高温、高压性能，密封效果好，承压强度大，运转灵活，使用寿命长，安装方便的采用组合式密封结构的管道补偿 器。
本发明的目的是通过采用以下技术方案来实现的：
采用组合式密封结构的管道补偿器，包括外套管、旋转芯管和填料压盖，旋转芯管设在外套管内，填料压盖的端面与外套管的内表面、旋转芯管的外表面构成填料密封腔，密封腔内设有密封填料，所述密封填料包括压变式金属环和非金属柔性填料，压变式金属环在外力作用下会产生径向扩张和变形，使其内外两侧边与所在密封腔的侧壁紧密配合；同时，压变式金属环与非金属柔性填料紧密结合，从而达到密封效果。
作为本发明的优选技术方案，所述压变式金属环由金属空心管弯曲构成，或者由截面为半圆形、弧形、V形的金属片弯曲构成。
作为本发明的优选技术方案，所述金属空心管包括空心圆管或椭圆形空心管。
作为本发明的优选技术方案，所述压变式金属环包括封闭式金属环或一侧开口的C形金属环。
作为本发明的优选技术方案，所述密封填料包括至少两层压变式金属环和两层非金属柔性填料，第一压变式金属环设在密封腔的底部，然后依次是第一非金属柔性填料、第二压变式金属环、第二非金属柔性填料。
作为本发明的优选技术方案，所述第一压变式金属环由金属空心管弯曲构成，第二压变式金属环由弧形或V形金属片弯曲构成。
作为本发明的优选技术方案，所述第一压变式金属环是端口焊接的封闭式金属环，第二压变式金属环是一侧开口的C形金属环。
作为本发明的优选技术方案，所述压变式金属环是铜环或铝合金环，所述非金属柔性填料是石墨盘根或石棉盘根。
作为本发明的优选技术方案，所述外套管的内壁设有内凸环，旋转芯管的端部设有与所述内凸环相配合的台阶形外凸缘，所述外凸缘与内凸环之间形成 的装配间隙位于密封腔底部的中间位置。
作为本发明的优选技术方案，所述旋转芯管的外凸缘设有至少二级台阶，上台阶的侧面与内凸环相对面之间设有线型金属密封环；所述外套管是整体结构的旋转式变径管，外套管的端管内径与旋转芯管的内径相等。
本发明的有益效果是：相对于现有技术，本发明采用软质易拉伸的压变式金属环与非金属柔性填料在外力作用下压紧形成复合密封结构，使金属环及柔性填料在径向得到扩张，其内外两侧的边沿与所在密封腔侧壁紧密配合；同时，旋转芯管外凸缘台阶的侧面与外套管内凸环相对面之间嵌设线型金属密封环，此密封环能够随着管道介质压力的高低变化形成正相关自密封作用，从而达到进一步增强密封的效果。
补偿器工作时，压变式金属环放置在密封腔底部，能够阻隔高温、高压介质与柔性密封填料的直接接触，有效减少柔性填料的损耗，同时达到延长密封填料使用寿命和加强密封的效果。线型金属密封环与压变式金属环在承压状态下形成端面密封，摩擦力小，密封效果好，有利于补偿器的灵活运转。既形成端面密封，又能起到防脱和减摩作用。
本发明具有较强耐高温、高压性能，密封性能好，承压强度大，使用寿命长，安装方便。特别适用于高温、高压热力管网，使用安全可靠，并且有利于节能和保护环境。
附图说明
图1是本发明的结构示意图。
图中：1、压变式金属环，2、线型金属密封环，3、外套管，4、柔性填料，5、填料压盖，6、旋转芯管，31、内凸环，32、端管，61、台阶形外凸缘。
具体实施方式
下面结合附图与具体实施例对本发明作进一步说明：
如图1所示，采用组合式密封结构的管道补偿器，包括外套管3、旋转芯管 6和填料压盖5，旋转芯管6设在外套管3内，填料压盖5的端面与外套管3的内表面、旋转芯管6的外表面构成填料密封腔，密封腔内设有密封填料，所述密封填料包括压变式金属环1和非金属柔性填料4，压变式金属环1在外力作用下会产生径向扩张和变形，使其内外两侧边与所在密封腔的侧壁紧密配合；同时，压变式金属环1与柔性填料4紧密结合，从而达到密封效果。
本实施例中，所述压变式金属环1由金属空心管弯曲构成，或者由截面为半圆形、弧形、V形的金属片弯曲构成；金属空心管包括空心圆管或椭圆形空心管；压变式金属环1包括连接端焊接的封闭式金属环，或一侧开口的C形金属环。
本实施例密封腔内的密封填料包括三层压变式金属环1和两层非金属柔性填料4，第一压变式金属环设在密封腔的底部，然后依次是第一非金属柔性填料、第二压变式金属环、第二非金属柔性填料、第三压变式金属环。所述第一压变式金属环由金属空心管弯曲构成，第二压变式金属环由弧形金属片弯曲构成，第三压变式金属环由V形金属片弯曲构成。所述第一压变式金属环是端口焊接的封闭式金属环，第二和第三压变式金属环是一侧开口的C形金属环。所述压变式金属环1是铜环或铝合金环，柔性填料4是石墨盘根或石棉盘根。
所述外套管3的内壁设有内凸环31，旋转芯管6的端部设有与内凸环31相配合的台阶形外凸缘61，外凸缘61与内凸环31之间形成的装配间隙位于密封腔底部的中间位置。所述旋转芯管6的外凸缘61设有上、下二级台阶，上台阶的侧面与内凸环31相对面之间设有线型金属密封环2。本发明外套管3是整体拉伸结构的旋转式变径管，外套管3端管32的内径与旋转芯管6的内径相等。
上述实施例仅限于说明本发明的构思和技术特征，其目的在于让本领域的技术人员了解发明的技术方案和实施方式，并不能据此限制本发明的保护范围。凡是根据本发明技术方案所作的等同替换或等效变化，都应涵盖在本发明的保护范围之内。

Claims (10)

  1. 一种采用组合式密封结构的管道补偿器，包括外套管、旋转芯管和填料压盖，旋转芯管设在外套管内，填料压盖的端面与外套管的内表面、旋转芯管的外表面构成填料密封腔，密封腔内设有密封填料，其特征是：所述密封填料包括压变式金属环和非金属柔性填料，压变式金属环在外力作用下会产生径向扩张和变形，使其内外两侧边与所在密封腔的侧壁紧密配合；同时，压变式金属环与非金属柔性填料紧密结合，从而达到密封效果。
  2. 根据权利要求1所述采用组合式密封结构的管道补偿器，其特征是：所述压变式金属环由金属空心管弯曲构成，或者由截面为半圆形、弧形、V形的金属片弯曲构成。
  3. 根据权利要求2所述采用组合式密封结构的管道补偿器，其特征是：所述金属空心管包括空心圆管或椭圆形空心管。
  4. 根据权利要求1所述采用组合式密封结构的管道补偿器，其特征是：所述压变式金属环包括封闭式金属环或一侧开口的C形金属环。
  5. 根据权利要求1所述采用组合式密封结构的管道补偿器，其特征是：所述密封填料包括至少两层压变式金属环和两层非金属柔性填料，第一压变式金属环设在密封腔的底部，然后依次是第一非金属柔性填料、第二压变式金属环、第二非金属柔性填料。
  6. 根据权利要求5所述采用组合式密封结构的管道补偿器，其特征是：所述第一压变式金属环由金属空心管弯曲构成，第二压变式金属环由弧形或V形金属片弯曲构成。
  7. 根据权利要求6所述采用组合式密封结构的管道补偿器，其特征是：所述第一压变式金属环是端口焊接的封闭式金属环，第二压变式金属环是一侧开 口的C形金属环。
  8. 根据权利要求1所述采用组合式密封结构的管道补偿器，其特征是：所述压变式金属环是铜环或铝合金环，所述非金属柔性填料是石墨盘根或石棉盘根。
  9. 根据权利要求1至8任一项所述采用组合式密封结构的管道补偿器，其特征是：所述外套管的内壁设有内凸环，旋转芯管的端部设有与所述内凸环相配合的台阶形外凸缘，所述外凸缘与内凸环之间形成的装配间隙位于密封腔底部的中间位置。
  10. 根据权利要求9所述采用组合式密封结构的管道补偿器，其特征是：所述旋转芯管的外凸缘设有至少二级台阶，上台阶的侧面与内凸环相对面之间设有线型金属密封环；所述外套管是整体结构的旋转式变径管，外套管的端管内径与旋转芯管的内径相等。
PCT/CN2020/115049 2019-09-14 2020-09-14 采用组合式密封结构的管道补偿器 WO2021047671A1 (zh)

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