The invention discloses a gate valve sealing structure. As a sealing structure between the valve seat and the gate plate, the valve stem drives the wedge in the gate bracket to move downward during the gate closing process, and the interaction force between the wedge and the angle inclined block at the back of the parallel gate plate provides the initial sealing specific pressure of the valve, thus realizing the low pressure sealing. Under the action of medium force, the valve can be sealed under high pressure; during the opening process of the gate, the valve stem drives the wedge to move upward, and the reset spring provides rebound force, which makes the sealing surface of the gate break away from the sealing surface of the valve body, reduces the wear between the two sealing surfaces, and at the same time reduces the friction moment when the valve is opened and closed. As the sealing structure between the valve seat and the gate plate, the invention can improve the sealing reliability of the gate valve and the service life of the valve, make the valve realize reliable sealing under the conditions of high pressure and low pressure, adopt pure metal seal, use high temperature, and solve the problem that the traditional gate valve can not be used in high temperature and ultra-high temperature conditions.
【技术实现步骤摘要】
一种闸阀密封结构
本专利技术涉及一种用于阀门领域的闸阀密封结构。
技术介绍
闸阀是一种使用广泛,性能可靠的截断阀门。在高温、高压工况下,对闸阀的密封性能、可靠性等要求特别高。高温、高压工程项目中,闸阀一般采用了楔式闸板密封结构,在介质压力的共同作用下,保证了阀座与闸板间的密封性能。但高温工况下材料的热膨胀、阀杆部位的热伸长及频繁启闭导致的密封面磨损,通常会导致阀门密封泄漏和卡滞现象的发生,严重影响了工程系统的可靠运行。图1是目前市场上适用于高温高压工况的楔式闸阀密封结构。楔式闸板500在驱动力的作用下向下作关闭运动,由于闸板500两侧密封面与阀门竖直中心线夹角为3°~5°,闸板500两侧密封面贴紧阀座密封面,提供了初始密封比压,在高压介质力的作用下,密封效果越来越好;同时在阀门出现泄漏的情况下,可增加阀门驱动力,实现强制密封。上述结构,在冷热交变的工况下,由于阀门内部结构件形状、材质及热膨胀系数的差异,经常会出现在高温工况下关闭,恢复到常温工况时,闸板500与阀座600密封面抱死,启闭力矩增大,密封面磨损严重,甚至阀门无法启闭,严重影响了工程系统的可靠运行。图2是目前市场上适用于高温高压工况的平板闸阀密封结构。双平行式的闸板500在驱动力的作用下向下作关闭运动,由于双平行式的闸板500内侧设置有撑开弹簧510,在弹簧力的作用下,两侧闸板500密封面贴紧阀座600密封面,并提供了初始密封比压,在高压介质力的作用下,密封效果越来越好。由于是平行式闸板结构,需通过弹簧力及介质作用力共同作用实现阀门密封,在阀门趋于开启时,闸板500密封面与阀座600密封面在介质力 ...
【技术保护点】
1.一种闸阀密封结构,包括位于闸板托架、平行式闸板、楔块、阀杆和复位弹簧,其特征在于:所述闸板托架的左右两个侧面开设有闸板插槽,所述闸板托架的顶面设有托架支撑架,所述托架支撑架的顶部中央开设通孔,所述阀杆穿过通孔与设置在所述闸板托架中央的楔块连接;每个所述闸板插槽内均插接一个所述平行式闸板,所述平行式闸板的朝向所述闸板托架内侧的表面上设有角斜块,所述角斜块的斜面与所述楔块相匹配;所述平行式闸板上和所述插板托架的底部设有复位弹簧。
【技术特征摘要】
1.一种闸阀密封结构,包括位于闸板托架、平行式闸板、楔块、阀杆和复位弹簧,其特征在于:所述闸板托架的左右两个侧面开设有闸板插槽,所述闸板托架的顶面设有托架支撑架,所述托架支撑架的顶部中央开设通孔,所述阀杆穿过通孔与设置在所述闸板托架中央的楔块连接;每个所述闸板插槽内均插接一个所述平行式闸板,所述平行式闸板的朝向所述闸板托架内侧的表面上设有角斜块,所述角斜块的斜面与所述楔块相匹配;所述平行式闸板上和所述插板托架的底部设有复位弹簧。2.根据权利要求1所述的一种闸阀密封结构,其特征在...
【专利技术属性】
技术研发人员:郑志成,刘其斌,邵正胜,刘敏,陈成,
申请(专利权)人:上海阀门厂股份有限公司,
类型:发明
国别省市:上海,31
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