WO2023025163A1 - 一种防止阀杆卡滞组件、防止阀杆卡滞的阀门结构和方法 - Google Patents

一种防止阀杆卡滞组件、防止阀杆卡滞的阀门结构和方法 Download PDF

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WO2023025163A1
WO2023025163A1 PCT/CN2022/114333 CN2022114333W WO2023025163A1 WO 2023025163 A1 WO2023025163 A1 WO 2023025163A1 CN 2022114333 W CN2022114333 W CN 2022114333W WO 2023025163 A1 WO2023025163 A1 WO 2023025163A1
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Prior art keywords
valve
valve stem
preventing
assembly
sticking
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PCT/CN2022/114333
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English (en)
French (fr)
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钱锦远
母娟
林振浩
金志江
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浙江大学
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Publication of WO2023025163A1 publication Critical patent/WO2023025163A1/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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • 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
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member

Definitions

  • the invention relates to the field of valve structures for preventing valve stem from sticking, in particular to a valve stem preventing component and a valve structure and method for preventing valve stem from sticking.
  • the force on the bottom surface of the spool shows an obvious unbalanced phenomenon, and the unbalanced pressure distribution causes an unbalanced moment at the bottom surface of the spool, and the spool under the unbalanced moment Under the action of the valve stem, the valve stem will be deflected, causing extrusion between the valve stem and the bonnet, causing the valve stem to bend and deform, and finally causing the valve stem to stick.
  • the purpose of the present invention is to solve the sticking phenomenon of the valve stem caused by the unbalanced force of the valve core, and provide a valve structure and method for preventing the sticking assembly of the valve stem and preventing the sticking of the valve stem.
  • the present invention provides a valve rod sticking prevention assembly, including a rigid ring and an elastic ring, the rigid ring is coaxially sleeved inside the elastic ring and the inner wall is a straight cylindrical structure; the valve rod can be guided by the rigid ring Move up and down along the inner wall of the rigid ring, and together form a sliding pair; the connection between the rigid ring and the valve stem is closed.
  • the outer walls of the rigid ring near the two ends extend outward to form annular protrusions, and the inner walls of the elastic ring near the two ends are recessed to form annular grooves; between the rigid ring and the elastic ring Connected by a protrusion and groove snap fit.
  • the thickness of the elastic ring is greater than that of the rigid ring.
  • the present invention provides a valve structure for preventing valve stem from sticking, including an upper valve cover, a lower valve cover, a valve stem, and a valve stem sticking preventing assembly as described in any one of the first aspect;
  • the upper bonnet and the lower bonnet are detachably connected, and jointly constitute a bonnet assembly for closing the valve body; a vertical through hole is opened in the center of the bonnet assembly, and a valve stem is arranged in a clearance fit in the through hole. ;
  • an annular hole is coaxially opened for installing the stem clamping prevention component, so as to prevent the top and bottom of the valve stem clamping component from passing through the upper bonnet and the lower bonnet Compression limit; the outer wall of the elastic ring is in interference fit with the inner wall of the annular hole, and the rigid ring is sleeved on the outer wall of the valve stem and the joint is closed.
  • the upper valve cover and the lower valve cover are detachably connected by bolts.
  • a sealing ring is provided at the joint between the upper valve cover and the lower valve cover.
  • the anti-sticking assembly of the valve stem, the valve stem and the valve cover assembly are coaxially arranged.
  • the present invention provides a method for preventing the valve stem from sticking using any one of the valve structures described in the second aspect, specifically as follows:
  • valve core During the opening and closing process of the valve core, the flow of fluid in the valve is unevenly distributed; the valve core is subjected to unbalanced fluid force during the movement process, and the bottom surface will generate an unbalanced moment, and the valve core is under the action of the unbalanced torque. It drives the valve stem to deflect, and squeezes one side of the valve stem clamping component to prevent the elastic ring of the valve stem clamping component from shrinking and deforming under pressure; while buffering the valve stem deflection, it prevents the valve stem from contacting the valve The wall of the through hole in the cover assembly is deformed due to extrusion, thereby preventing the valve stem from being stuck.
  • the present invention has the following beneficial effects:
  • a certain gap is left between the valve stem and the valve cover assembly by setting the valve stem sticking prevention component, so as to prevent the inner ring surface of the valve stem clamping component from closely fitting with the valve stem, and play a role in the valve stem.
  • the guiding function enables it to move along the vertical direction while ensuring the sealing performance of the valve.
  • valve stem sticking prevention assembly composed of a rigid ring and an elastic ring
  • the rigid contact and extrusion between the valve stem and the valve cover assembly are buffered.
  • the function is to avoid the bending of the valve stem caused by the extrusion between the valve stem and the valve cover assembly under the action of the unbalanced force of the valve core, thereby preventing the valve stem from being stuck.
  • the anti-sticking assembly of the valve stem of the present invention has a simple structure and is easy to manufacture, and is suitable for most valves with long valve stem structures.
  • Fig. 1 is a cross-sectional view when the valve structure for preventing valve stem sticking involved in the present invention is closed;
  • Fig. 2 is a partial enlarged view of the valve stem sticking prevention assembly involved in the present invention
  • the invention provides an assembly for preventing valve stem from sticking.
  • the assembly for preventing valve stem from sticking is a ring-shaped structure. When in use, it is sleeved outside the target valve stem so that the valve stem can be guided by the assembly for preventing valve stem from sticking. While moving in the vertical direction, it can avoid the sticking phenomenon of the valve stem.
  • the valve stem sticking preventing component mainly includes a rigid ring 5-1 and an elastic ring 5-2.
  • the rigid ring 5-1 and the elastic ring 5-2 are coaxially sleeved, and the rigid ring 5-1 is located inside the elastic ring 5-2.
  • the inner wall of the rigid ring 5-1 is a straight cylindrical structure, which is used to guide the movement of the valve stem. Therefore, the valve stem can move up and down along the inner wall of the rigid ring 5-1, and the valve stem and the rigid ring 5-1 work together. form a sliding pair.
  • the joint between the rigid ring 5-1 and the valve stem should be kept closed.
  • the outer walls of the rigid ring 5-1 near the two ends can be horizontally extended outward to form annular protrusions
  • the inner wall near the two ends of the elastic ring 5-2 is recessed to form an annular groove. That is to say, from the perspective of half of the axial sectional view of the stem sticking preventing assembly, the rigid ring 5-1 is in a concave shape, and the elastic ring 5-2 is in a convex shape.
  • the rigid ring 5-1 and the elastic ring 5-2 can be engaged and connected by protrusions and grooves, and the elastic ring 5-2 can completely wrap the outer wall of the rigid ring 5-1.
  • the thickness of the elastic ring 5-2 can be set to be greater than that of the rigid ring 5-1.
  • the present invention provides a valve structure utilizing the valve stem sticking prevention assembly, which mainly includes an upper valve cover 1 , a lower valve cover 2 , a valve stem 6 and a valve stem sticking prevention assembly 5 .
  • the upper valve cover 1 and the lower valve cover 2 are detachably connected, and together constitute a valve cover assembly for closing the valve body 4 .
  • the center of the valve cover assembly is provided with a vertical through hole along the central axis, and a valve stem 6 is arranged in the through hole. That is to say, the valve rod 6 runs through the upper valve cover 1 and the lower valve cover 2 .
  • an annular hole is coaxially opened for installing the stem clamping prevention assembly 5, preventing the top and bottom of the valve stem clamping assembly 5 from passing through the upper bonnet 1 and the lower bonnet 1.
  • the bonnet 2 is press-fitted to a limited position.
  • the upper half of the annular hole can be opened at the bottom center of the upper valve cover 1
  • the lower half of the annular hole can be opened at the top center of the lower valve cover 2 .
  • This arrangement is to facilitate the placement and installation of the valve stem clamping component 5 in the annular hole, and to prevent the valve stem clamping component 5 from interfering with the inner wall of the annular hole after the valve stem clamping component 5 is put into the circular hole.
  • the rigid ring 5-1 is sleeved on the outer wall of the valve stem 6 and the joint is closed.
  • the upper bonnet 1 and the lower bonnet 2 can be detachably connected by bolts; in order to achieve a better valve sealing effect, a sealing ring is provided at the connection between the upper bonnet 1 and the lower bonnet 2 ;, to prevent the valve stem sticking assembly 5, the valve stem 6 and the valve cover assembly are coaxially arranged.
  • the anti-sticking assembly of the valve stem of the present invention can be applied to most valves with elongated valve stem structures, as shown in Figure 1, it is a valve structure that can be applied to the anti-sticking assembly of the valve stem of the present invention, and its main structure includes The upper valve cover 1, the lower valve cover 2, the valve body 4, the valve cage 3, the valve seat 8, the valve core 7, the valve stem 6 and the valve stem sticking preventing component 5.
  • the cage 3 is a sleeve structure, the lower part is provided with a throttling hole, and the upper and lower end surfaces are stepped surfaces, which cooperate with the valve body 4 and the valve seat 8 respectively. effect.
  • the valve seat 8 is a cylindrical structure with a bottom, located below the valve cage 3 and the valve core 7, and is used to support the fully closed position of the valve core 7, and has through holes around it.
  • the valve core 7 is a cylindrical structure with upper and lower through holes inside, the upper end is threaded with the valve stem 6, the lower end is in contact with the valve seat 8 in the fully closed position, and the peripheral surface is in contact with the inner ring surface of the cage 3.
  • the valve stem 6 is a rod-shaped structure, the lower end has an external thread, and is threadedly connected with the valve core 7, and the diameter of the valve stem 6 is slightly smaller than the diameter of the through hole in the upper valve cover 1 and the lower valve cover 2.
  • the method of using this valve structure to prevent sticking of the valve stem is as follows: During the opening and closing process of the valve core 7, the flow of fluid in the valve will be unevenly distributed. Therefore, the spool 7 will be subjected to an unbalanced force from the fluid during the opening and closing movement, and an unbalanced moment will be generated on the bottom surface of the spool 7, and the spool 7 will drive the valve stem 6 to deflect under the action of the unbalanced moment. Squeeze one side of the valve stem locking assembly 5 to prevent the elastic ring 5 - 2 of the valve stem locking assembly 5 from shrinking and deforming under pressure. Therefore, while the valve stem clamping component 5 buffers the deflection of the valve stem 6, it can also avoid the deformation between the valve stem 6 and the through-hole wall in the bonnet assembly due to extrusion, thereby preventing the valve stem from being stuck. .
  • valve stem 6 In the general valve structure, there is no gap between the valve stem 6 and the internal channel of the valve cover and they are tightly fitted.
  • the valve core 7 When the valve core 7 is opened and closed, the fluid distribution in the valve is uneven, resulting in uneven fluid force on the valve core 7. 7 will generate an unbalanced moment on the bottom surface, and the valve core 7 will drive the valve stem 6 to deflect under the action of the unbalanced moment, resulting in extrusion between the valve stem 6 and the valve covers 1 and 2, causing the valve stem 6 to bend Deformation eventually causes valve stem 6 to stick.
  • the present invention provides a valve stem sticking preventing component composed of a rigid ring and an elastic ring, while ensuring the normal movement of the valve stem and the sealing performance of the valve, the rigid contact and extrusion between the valve stem and the valve cover assembly are buffered. , to avoid the valve stem bending caused by extrusion between the valve stem and the valve cover assembly under the action of the unbalanced force of the valve core, thereby preventing the valve stem from being stuck.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)

Abstract

公开了一种防止阀杆卡滞组件、防止阀杆卡滞的阀门结构和方法。防止阀杆卡滞组件包括刚性环(5-1)和弹性环(5-2)，刚性环同轴套设于弹性环内部且内壁为直筒状结构；阀杆(6)能在刚性环的导向下沿刚性环内壁上下移动，并共同构成滑动副；刚性环与阀杆之间的连接处封闭。该防止阀杆卡滞组件结构简单，制造方便，适用于大多数具有长形阀杆结构的阀门。

Description

一种防止阀杆卡滞组件、防止阀杆卡滞的阀门结构和方法 技术领域
本发明涉及防止阀杆卡滞的阀门结构领域，尤其涉及一种防止阀杆卡滞组件、防止阀杆卡滞的阀门结构和方法。
背景技术
在水平布置的采用活塞式阀芯结构的阀门中，其阀芯底面受力表现出明显的不均衡现象，压力分布不均衡现象使得阀芯底面处产生一个不平衡力矩，阀芯在不平衡力矩的作用下会带动阀杆发生偏转，从而造成阀杆与阀盖之间产生挤压，导致阀杆弯曲变形，最终引起阀杆卡滞。
在目前市面上的阀门结构中，缺乏针对由于阀芯受到的不平衡力矩引起的阀杆卡滞问题的改进设计，尤其缺乏一种将阀杆与阀盖接触面分离的防止阀杆卡滞的结构。中国实用新型专利CN 211371292U公开了一种新型蒸汽调节阀，该结构将阀芯与流通板通过弹性件连接，当该蒸汽阀上部的驱动原件失效时，阀芯在重力和弹性件的作用下向下移动，并且通过蒸汽带来的压力使得阀芯和流通板紧密贴合，使的蒸发阀始终处于关闭状态，防止对用汽设备造成伤害，便于维修人员检修。但该阀门结构阀杆与阀盖之间仍紧密配合，阀杆与阀盖之间容易产生较大挤压力，且结构较为复杂，不具有普适性。
发明内容
本发明的目的在于解决由于阀芯不平衡力导致的阀杆卡滞现象，提供了一种防止阀杆卡滞组件、防止阀杆卡滞的阀门结构和方法。
本发明所采用的具体技术方案如下：
第一方面，本发明提供了一种防止阀杆卡滞组件，包括刚性环和弹性环，刚性环同轴套设于弹性环内部且内壁为直筒状结构；阀杆能在刚性环的导向下沿刚性环内壁上下移动，并共同构成滑动副；刚性环与阀杆之间的连接处封闭。
作为优选，所述刚性环靠近两个端部的外壁周侧向外延伸形成环状凸起，弹 性环靠近两个端部的内壁凹陷形成环状凹槽；所述刚性环和弹性环之间通过凸起和凹槽卡合连接。
作为优选，所述弹性环的厚度大于刚性环的厚度。
第二方面，本发明提供了一种防止阀杆卡滞的阀门结构，包括上阀盖、下阀盖、阀杆和如第一方面任一所述的防止阀杆卡滞组件；
所述上阀盖和下阀盖可拆卸式连接，并共同构成用于封闭阀体的阀盖组件；所述阀盖组件的中心开设竖直的通孔，通孔内间隙配合设有阀杆；在位于上阀盖和下阀盖的连接处，同轴开设用于安装所述防止阀杆卡滞组件的环形孔，防止阀杆卡滞组件的顶部和底部通过上阀盖和下阀盖压合限位；所述弹性环的外壁与环形孔内壁过盈配合，刚性环套设于阀杆外壁且连接处封闭。
作为优选，所述上阀盖和下阀盖之间通过螺栓可拆卸式连接。
作为优选，所述上阀盖和下阀盖的连接处设有密封圈。
作为优选，所述防止阀杆卡滞组件、阀杆和阀盖组件均同轴设置。
第三方面，本发明提供了一种利用第二方面任一所述阀门结构以实现防止阀杆卡滞的方法，具体如下：
在阀芯的启闭过程中，阀内流体的流动呈现分布不均匀状态；阀芯在运动过程中受到流体不平衡的作用力，底面会产生不平衡力矩，阀芯在不平衡力矩的作用下带动阀杆发生偏转，对防止阀杆卡滞组件的一侧产生挤压，防止阀杆卡滞组件的弹性环在压力作用下收缩变形；在缓冲阀杆发生偏转的同时，避免阀杆与阀盖组件内通孔壁之间由于挤压作用产生变形，进而防止阀杆发生卡滞现象。
本发明相对于现有技术而言，具有以下有益效果：
1)本发明通过设置防止阀杆卡滞组件，使阀杆与阀盖组件之间留有一定的间隙，防止阀杆卡滞组件的内环面与阀杆紧密配合，在对阀杆起到导向作用使其能沿垂直方位移动的同时，保证了阀门的密封性能。
2)本发明通过设置由刚性环和弹性环组成的防止阀杆卡滞组件，在保证阀杆正常运动以及阀门密封性的同时，缓冲了阀杆与阀盖组件之间的刚性接触以及挤压作用，避免阀杆在阀芯不平衡力的作用下与阀盖组件之间产生挤压造成的阀杆弯曲，进而避免阀杆卡滞。
3)本发明的防止阀杆卡滞组件结构简单，制造方便，适用于大多数具有长 形阀杆结构的阀门。
附图说明
图1为本发明所涉及防止阀杆卡滞的阀门结构关闭时的剖视图；
图2为本发明所涉及防止阀杆卡滞组件的局部放大图；
图中：1、上阀盖；2、下阀盖；3、阀笼；4、阀体；5、防止阀杆卡滞组件；5-1、刚性环；5-2、弹性环；6、阀杆；7、阀芯；8、阀座。
具体实施方式
下面结合附图和具体实施方式对本发明做进一步阐述和说明。本发明中各个实施方式的技术特征在没有相互冲突的前提下，均可进行相应组合。
本发明提供了一种防止阀杆卡滞组件，防止阀杆卡滞组件整体为一个环状结构，在使用时套设于目标阀杆外部，使阀杆能在防止阀杆卡滞组件的导向下实现竖直方向移动的同时，避免阀杆发生卡滞现象。
如图2所示，防止阀杆卡滞组件主要包括刚性环5-1和弹性环5-2。刚性环5-1和弹性环5-2同轴套设，刚性环5-1位于弹性环5-2的内部。刚性环5-1的内壁为直筒状结构，用于为阀杆的移动起到导向作用，因此，阀杆能沿着刚性环5-1的内壁上下移动，阀杆和刚性环5-1共同构成滑动副。同时，为了保证阀门的气密性，刚性环5-1与阀杆之间的连接处应当保持封闭。
在实际应用时，为了保证刚性环5-1和弹性环5-2之间的连接配合，可以将刚性环5-1靠近两个端部的外壁周侧向外水平延伸形成环状凸起，将弹性环5-2靠近两个端部的内壁凹陷形成环状凹槽。也就是说，从防止阀杆卡滞组件的轴向剖面图的一半来看，刚性环5-1呈凹字形结构，弹性环5-2呈凸字形结构。刚性环5-1和弹性环5-2之间能通过凸起和凹槽卡合连接，且弹性环5-2能将刚性环5-1的外壁完全包裹。为了实现更好的缓冲效果，可以将弹性环5-2的厚度设置为大于刚性环5-1的厚度。
本发明提供了一种利用上述防止阀杆卡滞组件的阀门结构，主要包括上阀盖1、下阀盖2、阀杆6和防止阀杆卡滞组件5。其中，上阀盖1和下阀盖2之间可拆卸式连接，并共同构成用于封闭阀体4的阀盖组件。阀盖组件的中心沿中轴线开设竖直的通孔，通孔内设有阀杆6。也就是说，阀杆6贯穿上阀盖1和下阀盖2。阀杆6与通孔壁之间具有一定的空隙，阀杆6与通孔之间为间隙配合。在位于上阀盖1和下阀盖2的连接处，同轴开设用于安装防止阀杆卡滞组件5的环形 孔，防止阀杆卡滞组件5的顶部和底部通过上阀盖1和下阀盖2压合限位。在实际应用时，可以将环形孔的上半部分开设于上阀盖1的底部中心处，环形孔的下半部分开设于下阀盖2的顶部中心处。该种设置方式是为了便于向环形孔内放置安装防止阀杆卡滞组件5，防止阀杆卡滞组件5在放入环形孔内后，弹性环5-2的外壁与环形孔内壁过盈配合，刚性环5-1套设于阀杆6外壁且连接处封闭。
在实际使用时，上阀盖1和下阀盖2之间可以通过螺栓可拆卸式连接；为了实现更好的阀门密封效果，在上阀盖1和下阀盖2的连接处设有密封圈；，防止阀杆卡滞组件5、阀杆6和阀盖组件均同轴设置。
本发明的防止阀杆卡滞组件可以适用于大多数具有长形阀杆结构的阀门，如图1所示，为一种可以应用本发明防止阀杆卡滞组件的阀门结构，其主体结构包括上阀盖1、下阀盖2、阀体4、阀笼3、阀座8、阀芯7、阀杆6以及防止阀杆卡滞组件5。阀笼3为套筒结构，下部开设节流孔，上下端面均为台阶面，分别与阀体4和阀座8配合，阀笼3内环面与阀芯7接触，同时起阀芯7导向作用。阀座8为有底面的筒状结构，位于阀笼3与阀芯7下方，用于支撑阀芯7全关位置，四周开设有通孔。阀芯7为圆柱状结构，内部设有上下通孔，上端与阀杆6螺纹连接，全关位置时下端与阀座8接触，周面与阀笼3内环面接触。阀杆6为杆状结构，下端有外螺纹，与阀芯7之间为螺纹连接，阀杆6直径略小于上阀盖1和下阀盖2内部通孔的直径。
以图1所示的阀门结构为例，利用该阀门结构实现防止阀杆卡滞的方法具体如下：在阀芯7的启闭过程中，阀内流体的流动会呈现分布不均匀状态。因此，阀芯7在启闭的运动过程中会受到来自流体的不平衡作用力，阀芯7底面会产生不平衡力矩，阀芯7在不平衡力矩的作用下会带动阀杆6发生偏转，对防止阀杆卡滞组件5的一侧产生挤压，防止阀杆卡滞组件5的弹性环5-2在压力作用下收缩变形。因此，防止阀杆卡滞组件5在缓冲阀杆6发生偏转的同时，还能避免阀杆6与阀盖组件内通孔壁之间由于挤压作用产生变形，进而防止阀杆发生卡滞现象。
在一般阀门结构中，阀杆6与阀盖内部通道之间没有空隙并紧密贴合，当阀芯7启闭时，阀内流体分布不均匀导致阀芯7受到的流体力也不均匀，阀芯7底面就会产生一个不平衡力矩，阀芯7在不平衡力矩的作用下会带动阀杆6发生 偏转，从而造成阀杆6与阀盖1、2之间产生挤压，导致阀杆6弯曲变形，最终引起阀杆6卡滞。而本发明通过设置由刚性环和弹性环组成的防止阀杆卡滞组件，在保证阀杆正常运动以及阀门密封性的同时，缓冲了阀杆与阀盖组件之间的刚性接触以及挤压作用，避免阀杆在阀芯不平衡力的作用下与阀盖组件之间产生挤压造成的阀杆弯曲，进而避免阀杆卡滞。
以上所述的实施例只是本发明的一种较佳的方案，然其并非用以限制本发明。有关技术领域的普通技术人员，在不脱离本发明的精神和范围的情况下，还可以做出各种变化和变型。因此凡采取等同替换或等效变换的方式所获得的技术方案，均落在本发明的保护范围内。

Claims (8)

  1. 一种防止阀杆卡滞组件，其特征在于，包括刚性环(5-1)和弹性环(5-2)，刚性环(5-1)同轴套设于弹性环(5-2)内部且内壁为直筒状结构；阀杆(6)能在刚性环(5-1)的导向下沿刚性环(5-1)内壁上下移动，并共同构成滑动副；刚性环(5-1)与阀杆(6)之间的连接处封闭。
  2. 根据权利要求1所述的一种防止阀杆卡滞组件，其特征在于，所述刚性环(5-1)靠近两个端部的外壁周侧向外延伸形成环状凸起，弹性环(5-2)靠近两个端部的内壁凹陷形成环状凹槽；所述刚性环(5-1)和弹性环(5-2)之间通过凸起和凹槽卡合连接。
  3. 根据权利要求1所述的一种防止阀杆卡滞组件，其特征在于，所述弹性环(5-2)的厚度大于刚性环(5-1)的厚度。
  4. 一种防止阀杆卡滞的阀门结构，其特征在于，包括上阀盖(1)、下阀盖(2)、阀杆(6)和如权利要求1～3任一所述的防止阀杆卡滞组件(5)；
    所述上阀盖(1)和下阀盖(2)可拆卸式连接，并共同构成用于封闭阀体(4)的阀盖组件；所述阀盖组件的中心开设竖直的通孔，通孔内间隙配合设有阀杆(6)；在位于上阀盖(1)和下阀盖(2)的连接处，同轴开设用于安装所述防止阀杆卡滞组件(5)的环形孔，防止阀杆卡滞组件(5)的顶部和底部通过上阀盖(1)和下阀盖(2)压合限位；所述弹性环(5-2)的外壁与环形孔内壁过盈配合，刚性环(5-1)套设于阀杆(6)外壁且连接处封闭。
  5. 根据权利要求4所述的一种防止阀杆卡滞的阀门结构，其特征在于，所述上阀盖(1)和下阀盖(2)之间通过螺栓可拆卸式连接。
  6. 根据权利要求4所述的一种防止阀杆卡滞的阀门结构，其特征在于，所述上阀盖(1)和下阀盖(2)的连接处设有密封圈。
  7. 根据权利要求4所述的一种防止阀杆卡滞的阀门结构，其特征在于，所述防止阀杆卡滞组件(5)、阀杆(6)和阀盖组件均同轴设置。
  8. 一种利用权利要求4～7任一所述阀门结构以实现防止阀杆卡滞的方法，其特征在于，具体如下：
    在阀芯(7)的启闭过程中，阀内流体的流动呈现分布不均匀状态；阀芯(7)在运动过程中受到流体不平衡的作用力，底面会产生不平衡力矩，阀芯(7)在 不平衡力矩的作用下带动阀杆(6)发生偏转，对防止阀杆卡滞组件(5)的一侧产生挤压，防止阀杆卡滞组件(5)的弹性环(5-2)在压力作用下收缩变形；在缓冲阀杆(6)发生偏转的同时，避免阀杆(6)与阀盖组件内通孔壁之间由于挤压作用产生变形，进而防止阀杆发生卡滞现象。
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