一种旋转轴用轴向唇形密封装置Axial lip seal device for rotating shaft
本发明涉及机械制造中用于旋转轴类的密封件，具体是一种旋转轴用轴向唇形密封装置。The present invention relates to a seal for a rotating shaft in mechanical manufacturing, and more particularly to an axial lip seal for a rotating shaft.
在现有的旋转轴密封接触密封中，一般有两种，一种径向密封是用弹性橡胶和聚四氟塑料的唇部接触旋转轴的表面起到密封作用，简称为油封，另一种轴向密封是用两个硬质碳化硅、石墨、陶瓷、合金、钢、青铜、铸铁材料制成两个经研磨的密封端面在轴向弹簧压力下帖合滑动的密封机构，简称为机械密封。虽然都是以不同方式达到密封目的，但也不同程度的存在一些缺点，如弹性橡胶的密封唇部在润滑油介质中易发生膨胀、硬化等现象。聚四氟塑料密封唇部无压缩弹性，不能适应轴的粗糙度和偏心度的变化，对动态偏心跟随能力差，易伤轴，且都不耐压，机械密封的碳化硅和陶瓷密封环易破碎，抗重载不是很好。石墨密封环的密封端面在长期磨擦时易产生膨胀变形降低了密封端面平面度，造成密封介质从密封介面泄漏。在大口径端面密封中采用浮动密封，但使用过程中橡胶压缩轴向力失效现象较为普遍，难以达到预期效果。In the existing rotary shaft seal contact seals, there are generally two types. One type of radial seal is to seal the surface of the rotating shaft with the lip of elastic rubber and polytetrafluoroethylene, which is simply referred to as oil seal, and the other is The axial seal is a sealing mechanism that uses two hard silicon carbide, graphite, ceramic, alloy, steel, bronze, cast iron materials to make two polished sealing end faces that slide under axial spring pressure, which is referred to as mechanical seal. . Although the sealing purpose is achieved in different ways, there are also some disadvantages in different degrees, such as the phenomenon that the sealing lip of the elastic rubber is prone to expansion and hardening in the lubricating medium. The PTFE plastic sealing lip has no compression elasticity, can not adapt to the change of shaft roughness and eccentricity, has poor dynamic eccentric followability, is easy to hurt the shaft, and is not resistant to pressure. The mechanically sealed silicon carbide and ceramic sealing ring are easy. Broken, anti-heavy load is not very good. The sealing end face of the graphite sealing ring is prone to expansion deformation during long-term friction, which reduces the flatness of the sealing end face and causes the sealing medium to leak from the sealing interface. Floating seals are used in large-diameter end face seals, but the axial compression failure of rubber compression during use is more common and it is difficult to achieve the desired results.
发明内容Summary of the invention
针对现有技术的不足，本发明提供一种旋转轴用轴向唇形密封装置，该密封圈不易发生膨胀、硬化现象，能适应轴的粗糙度和偏心度的变化，对偏心跟随能力好，且能承受高压，在高速、高温、高尘、腐蚀密封介质环境中密封性好，可靠性高，使用寿命长，结构简单且易安装。In view of the deficiencies of the prior art, the present invention provides an axial lip seal device for a rotating shaft, which is less prone to expansion and hardening, and can adapt to changes in shaft roughness and eccentricity, and has good eccentric followability. It can withstand high pressure, has good sealing performance in high speed, high temperature, high dust and corrosive sealing medium environment, high reliability, long service life, simple structure and easy installation.
实现本发明目的的技术方案是：The technical solution for achieving the object of the present invention is:
一种旋转轴用轴向唇形密封装置，包括顺序连接的非补偿环、补偿环、补偿环座和压缩弹簧，补偿环的上端面与非补偿环端面贴合，下端面被补偿环座固定，补偿环座的下端面与压缩弹簧贴合，与现有技术不同的是，The invention relates to an axial lip seal device for a rotating shaft, comprising a non-compensating ring, a compensating ring, a compensating ring seat and a compression spring which are sequentially connected, the upper end surface of the compensating ring is matched with the end surface of the non-compensating ring, and the lower end surface is fixed by the compensating ring seat The lower end surface of the compensation ring seat is fitted to the compression spring, which is different from the prior art.
所述的补偿环为轴向唇形密封圈，其上端面为内圈低外圈高的漏斗形密封端面，在漏斗形密封端面的背面设有外大内小横V形弹簧槽，V形弹簧槽内配装自紧弹簧，The compensating ring is an axial lip seal ring, the upper end surface of which is a funnel-shaped sealing end face with a low inner ring and a high outer ring ring, and an outer large and small horizontal V-shaped spring groove is arranged on the back surface of the funnel-shaped sealing end face, and the V shape Self-tightening springs are fitted in the spring slots.
所述的压缩弹簧为组合压缩弹簧，包括环形圈、间隔设置在环形圈上下端面的上凸台和下凸台。The compression spring is a combined compression spring, comprising an annular ring, upper and lower bosses spaced apart from the upper and lower end faces of the annular ring.
结成型。The axial lip seal is made of engineering plastic PTFE plastic, and the filler is molded and burned.
所述的轴向唇形密封圈，使用的聚四氟乙烯塑料与填料的重量分配比为100：40-50。The axial lip seal has a weight distribution ratio of polytetrafluoroethylene plastic to filler of 100:40-50.
所述的漏斗形密封端面，内圈低外圈高的倾斜度为25-50°。The funnel-shaped sealing end surface has a low inclination of the inner ring and an outer ring height of 25-50°.
所述的自紧弹簧，是由弹簧钢丝制成的弹簧首尾相连有一定径向自紧力的弹簧。The self-tightening spring is a spring made of a spring steel wire and connected with a spring with a certain radial self-tightening force.
所述的组合压缩弹簧的环形圈由弹簧钢板或钢带冲压而成。The annular ring of the combined compression spring is stamped from a spring steel plate or a steel strip.
所述的上凸台和下凸台，由橡胶制成，分别包覆或包裹在环形圈的上、下端面上。The upper boss and the lower boss are made of rubber and are respectively wrapped or wrapped on the upper and lower end faces of the annular ring.
所述环形圈，在接触腐蚀性密封介质时，其上涂一层胶水烘干，然后包覆氟胶硫化模压而成；The annular ring is coated with a layer of glue when it is in contact with the corrosive sealing medium, and then is formed by vulcanization molding with a fluorine rubber;
所述的补偿环座，是由钢板冲床拉伸加工成有内翻边或外翻边的金属骨架经除油、除锈处理，包覆橡胶模压成型，内翻边和外翻边均设有与轴向唇形密封圈下端面匹配的径向唇形密封圈。The compensation ring seat is formed by drawing and forming a metal frame with an inner flange or an outer flange by a steel plate punching machine, and is subjected to oil removal and rust removal treatment, and the rubber molding is covered, and the inner flange and the outer flange are respectively provided. A radial lip seal that mates with the lower end of the axial lip seal.
本发明的积极效果是组合压缩弹簧产生的弹力使固定在补偿环座上的轴向唇形密封圈长期的贴合到非补偿环的端面，轴向唇形密封圈的V形弹簧槽有利于密封介质冷却密封端面摩擦产生的热量，密封介质承压在V形弹簧槽表面更有利于轴向唇形密封圈端面的承压能力，也利于弹簧的前后滑动作用调节密封介面比压作用；使轴向唇形密封圈的漏斗形密封端面与非补偿环密封端面贴合滑动时不易过紧过热。在密封腐蚀性介质中自紧弹簧采用氟胶O形圈，组合压缩弹簧的环形圈、补偿环座的金属骨架都粘合一层耐腐弹性氟胶，有效隔离腐蚀性介质的作用，铺助密封也采用耐腐弹性氟胶。由工程塑料聚四氟乙烯塑料制成的轴向唇形密封圈的漏斗形密封端面在组合压缩弹簧和自紧弹簧长期作用下会变形贴合滑动在非补偿环的磨损凹槽密封端面上，直到轴向唇形密封端面磨损完；轴向唇形密封圈是由聚四氟填充固体润滑和增强填料，有很好的耐磨性、减磨性、稳定性，大大提高了旋转轴用轴向唇形密封装置的使用寿命和可靠性。The positive effect of the invention is that the elastic force generated by the combined compression spring causes the axial lip seal fixed on the compensation ring seat to adhere to the end face of the non-compensation ring for a long time, and the V-shaped spring groove of the axial lip seal is favorable for The sealing medium cools the heat generated by the friction of the sealing end face, and the sealing medium is pressed on the surface of the V-shaped spring groove to facilitate the pressure bearing capacity of the end face of the axial lip sealing ring, and also facilitates the sealing action of the sealing interface by the front and rear sliding action of the spring; The funnel-shaped sealing end face of the axial lip seal and the non-compensating ring sealing end face are not easy to overheat and overheat when sliding. In the sealing corrosive medium, the self-tightening spring adopts a fluorine rubber O-ring, and the annular ring of the combined compression spring and the metal skeleton of the compensation ring seat are bonded with a corrosion-resistant elastic fluorine rubber to effectively isolate the corrosive medium. The seal is also made of corrosion-resistant elastic fluoro rubber. The funnel-shaped sealing end face of the axial lip seal made of engineering plastic PTFE plastic will deform and fit on the wear groove sealing end face of the non-compensating ring under the long-term action of the combined compression spring and the self-tightening spring. Until the end face of the axial lip seal is worn out; the axial lip seal is made of polytetrafluoro-filled solid lubrication and reinforcing filler, which has good wear resistance, wear-reducing and stability, and greatly improves the shaft for rotating shaft. The service life and reliability of the lip seal.
图1为本发明的一种旋转轴用轴向唇形密封装置纵剖面结构示意图；1 is a schematic longitudinal sectional view showing an axial lip seal device for a rotating shaft according to the present invention;
图2为单唇轴向唇形密封圈结构示意图；Figure 2 is a schematic view showing the structure of a single lip axial lip seal;
图3为双唇轴向唇形密封圈结构示意图；Figure 3 is a schematic view showing the structure of a lip-shaped axial lip seal;
图4为组合压缩弹簧结构示意图；Figure 4 is a schematic view showing the structure of a combined compression spring;
图中，1.非补偿环 2.补偿环 3.补偿环座 4.组合压缩弹簧 5.漏斗形密封端面 6.V形弹簧槽 7.自紧弹簧 8.环形圈 9.上凸台 10.下凸台 11金属骨架 12.径向唇形密封圈。In the figure, 1. Non-compensated ring 2. Compensating ring 3. Compensating ring seat 4. Combined compression spring 5. Funnel-shaped sealing end face 6. V-shaped spring groove 7. Self-tightening spring 8. Annular ring 9. Upper boss 10. Lower boss 11 metal frame 12. Radial lip seal.
The content of the present invention is further described below in conjunction with the accompanying drawings and embodiments, but is not intended to limit the invention.
如图1所示，一种旋转轴用轴向唇形密封装置，包括顺序连接的非补偿环1、补偿环2、补偿环座3和压缩弹簧4，补偿环2的上端面与非补偿环1的端面贴合，补偿环2的下端面被补偿环座3固定，补偿环座3的下端面与压缩弹簧4的上凸台9贴合。As shown in FIG. 1 , an axial lip seal device for a rotating shaft comprises a non-compensating ring 1 , a compensating ring 2 , a compensating ring seat 3 and a compression spring 4 which are sequentially connected, and an upper end surface and a non-compensating ring of the compensating ring 2 The end faces of 1 are bonded, and the lower end surface of the compensating ring 2 is fixed by the compensating ring seat 3, and the lower end surface of the compensating ring seat 3 is fitted to the upper boss 9 of the compression spring 4.
如图2所示，所述的补偿环2为单唇轴向唇形密封圈结构示意图，其上端面为内圈低外圈高的漏斗形密封端面5，在漏斗形密封端面5的背面设有外大内小横V形弹簧槽6，V形弹簧槽6内配装自紧弹簧7。As shown in FIG. 2, the compensating ring 2 is a schematic diagram of a single lip axial lip seal ring, and the upper end surface is a funnel-shaped sealing end surface 5 having a low inner ring and an outer ring height, and is disposed on the back surface of the funnel-shaped sealing end surface 5. There is a small inner V-shaped spring groove 6 in the outer large, and a self-tightening spring 7 is arranged in the V-shaped spring groove 6.
如图3所示，所述的补偿环2还可以是双唇轴向唇形密封圈结构示意图，设置有两个轴向唇形密封圈，两个轴向唇形密封圈平行排列，轴向唇形密封圈与轴向唇形密封圈之间用橡胶密封圈密封，每个轴向唇形密封圈的上端面为内圈低外圈高的漏斗形密封端面5，其倾斜度为45°，在漏斗形密封端面5的背面设有外大内小横V形弹簧槽6，V形弹簧槽6内配装自紧弹簧7。As shown in FIG. 3, the compensation ring 2 can also be a schematic diagram of a double lip axial lip seal, which is provided with two axial lip seals, and two axial lip seals are arranged in parallel, axially. The lip seal and the axial lip seal are sealed by a rubber seal ring, and the upper end surface of each axial lip seal is a funnel-shaped seal end face 5 with a low inner ring and a low outer ring, and the inclination is 45°. An outer large and small horizontal V-shaped spring groove 6 is provided on the back surface of the funnel-shaped sealing end surface 5, and a self-tightening spring 7 is disposed in the V-shaped spring groove 6.
如图4所示，所述的压缩弹簧4为组合压缩弹簧，包括环形圈8、间隔设置在环形圈上下端面的上凸台9和下凸台10。As shown in FIG. 4, the compression spring 4 is a combined compression spring, and includes an annular ring 8, an upper boss 9 and a lower boss 10 which are disposed at upper and lower end faces of the annular ring.
所述的轴向唇形密封圈，是由工程塑料聚四氟乙烯塑料为基体，加入填料经模压烧结成型，聚四氟乙烯塑料与填料的重量分配比为100：45，填料是固体的润滑剂和增强剂经压缩模塑烧结冷却等工艺制成；漏斗形密封端面的背面用车床加工成V形弹簧槽，V形弹簧槽内的自紧弹簧使漏斗形密封端面具有适度的弹性。The axial lip seal is made of engineering plastic PTFE plastic, and the filler is molded by molding. The weight distribution ratio of the polytetrafluoroethylene plastic to the filler is 100:45, and the filler is solid lubrication. The agent and the reinforcing agent are formed by compression molding, sintering, cooling, etc.; the back surface of the funnel-shaped sealing end face is processed into a V-shaped spring groove by a lathe, and the self-tightening spring in the V-shaped spring groove has a moderate elasticity of the funnel-shaped sealing end face.
所述的自紧弹簧7，是由弹簧钢丝制成的弹簧首尾相连有一定径向自紧力的弹簧；The self-tightening spring 7 is a spring made of a spring steel wire and a spring having a certain radial self-tightening force connected end to end;
所述的组合压缩弹簧的环形圈8由弹簧钢板或钢带冲压而成；The annular ring 8 of the combined compression spring is stamped from a spring steel plate or a steel strip;
所述的上凸台9和下凸台10，由橡胶制成，分别包覆或包裹在环形圈8的上、下端面上，若要获取更大的弹力，只需增加环形圈8的直径和增加凸台的数量，就能达到效果；The upper boss 9 and the lower boss 10 are made of rubber and are respectively wrapped or wrapped on the upper and lower end faces of the annular ring 8. To obtain a larger elastic force, it is only necessary to increase the diameter of the annular ring 8. And increase the number of bosses to achieve results;
所述环形圈8，在接触腐蚀性密封介质时，其上涂一层胶水烘干，然后包覆氟胶硫化模压而成；The annular ring 8 is coated with a layer of glue when it is in contact with the corrosive sealing medium, and then is formed by vulcanization molding with a fluorine rubber;
所述的补偿环座3，是由钢板冲床拉伸加工成有内翻边或外翻边的金属骨架11经除油、除锈处理，包覆橡胶模压成型，内翻边和外翻边均设有与轴向唇形密封圈下端面匹配的径向唇形密封圈12。The compensation ring seat 3 is a metal frame 11 which is stretched by a steel plate punching machine into an inner flange or an outer flange. After degreasing and derusting treatment, the rubber molding is covered, the inner flange and the outer flange are both A radial lip seal 12 is provided that mates with the lower end face of the axial lip seal.
In use, the non-compensating ring 1, the compensating ring 2, the compensating ring seat 3 and the compression spring 4 are sequentially arranged as an axial lip seal device for the rotating shaft, and the elastic force generated by the compression spring 4 after the force is applied to the upper boss 9 and the lower boss 10 make the annular ring 8 corrugated under the displacement of the displacement, and the upper boss 9 bears against the end surface of the compensation ring seat 3 so as to be fixed on the compensation ring seat 3.
The funnel-shaped sealing end face 5 of the axial lip seal 2 is attached to the end face of the non-compensation 1, and as the compression force increases, the sealing interface increases, and the sealing effect increases.