WO2019114228A1 - 一种凸阶梯轴磁流体密封装置 - Google Patents

一种凸阶梯轴磁流体密封装置 Download PDF

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Publication number
WO2019114228A1
WO2019114228A1 PCT/CN2018/091904 CN2018091904W WO2019114228A1 WO 2019114228 A1 WO2019114228 A1 WO 2019114228A1 CN 2018091904 W CN2018091904 W CN 2018091904W WO 2019114228 A1 WO2019114228 A1 WO 2019114228A1
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pole
magnetic fluid
convex
pole piece
shaft
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PCT/CN2018/091904
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English (en)
French (fr)
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杨小龙
陈帆
郝付详
孙彭
何美丽
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广西科技大学
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Publication of WO2019114228A1 publication Critical patent/WO2019114228A1/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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force

Definitions

  • the invention relates to a convex stepped shaft magnetic fluid sealing device, belonging to the field of mechanical engineering sealing.
  • the magnetic fluid seal seals the gas and the liquid by the magnetic fluid seal ring formed by the magnetic fluid under the action of the strong magnetic field. Since it is sealed and sealed by the magnetic fluid between the seal shaft, the seal shaft and the seal are avoided. The direct friction and the additional load are reduced. In addition, the magnetic fluid seal has the characteristics of zero leakage, high reliability and simple structure. Although magnetic fluid has been matured in vacuum low-pressure sealing and has been widely used, there are still many problems in high-pressure gas sealing and liquid sealing, such as magnetic fluid sealing pressure is too small, sealed. The medium can cause deterioration of the magnetic fluid, resulting in rapid failure of the seal, etc., and the sealing is difficult, and there is still a certain gap from the actual application. Therefore, how to rationally design the magnetic fluid seal structure parameters, improve the utilization efficiency of the permanent magnets, and enhance the seal pressure resistance is also a meaningful research content of the current magnetic fluid seal technology.
  • One of the methods for improving the pressure resistance of the magnetic fluid seal under a large gap is to increase the number of magnetic sources in the magnetic circuit by the magnetic fluid and to improve the shape of the pole piece, such as the seal described in the reference 1 (patent number CN204805552U).
  • the device and the sealing device described in the reference 2 (patent number CN202418592U).
  • Magnetic fluids are not magnetic when static, and exhibit magnetic properties only when applied by an external magnetic field.
  • the magnetic particles are integrated with the carrier liquid so that the magnetic fluid has both the magnetic properties of the ordinary magnetic material and the fluidity of the liquid, and thus has many unique properties.
  • the existing sealing device Compared with the common single magnetic source magnetic fluid seal or the common multi-magnetic source magnetic fluid seal, the existing sealing device increases the magnetic field strength and the sealing performance is greatly improved, but still can not meet the high sealing performance of the high speed heavy load occasion. Claim.
  • the object of the present invention is to provide a convex stepped shaft magnetic fluid sealing device, thereby solving the problem of low pressure resistance performance of the existing single magnetic source magnetic fluid sealing device and the multi-magnetic source magnetic fluid sealing device, and reducing stress concentration.
  • This sealing technology has been successfully applied in the fields of high speed and heavy load.
  • a convex stepped shaft magnetic fluid sealing device comprising an outer casing having an open end, a sealing assembly and an end cap for pressing the sealing assembly into the outer casing;
  • the sealing The assembly includes a shaft rotatably mounted in the housing by a bearing, the shaft including at least one convex step portion including a plurality of steps sequentially arranged in the axial direction, and an outer wall of the adjacent step passes between An arc-shaped chamfered transition surface joint; each transition surface jacket is provided with a pole piece matched with the transition surface, and the pole piece extends to one side or both sides of the transition surface to a position corresponding to a corresponding step of the side of the transition surface a gap is left between the inner wall of the pole piece and the corresponding transition surface and the step, and a pole tooth is formed on an inner wall of the pole piece and/or a portion corresponding to the inner wall of the pole piece on the shaft; between adjacent pole pieces Permanent magnets are provided.
  • outer walls of the adjacent steps are connected by a rounded transition surface.
  • the pole shoe has a corresponding portion corresponding to the rounded transition surface, and the radius of curvature of the circular arc of the inner surface of the pole piece is larger than the radius of curvature of the arc of the corresponding transition surface of the shaft; further, the radius of curvature of the circular arc of the inner surface of the pole piece is 3 ⁇ 43mm; correspondingly, the radius of curvature of the arc on the shaft is 2 ⁇ 40mm.
  • the adjacent side magnetic poles of the adjacent permanent magnets distributed in the axial direction are the same.
  • pole teeth include axial pole teeth and/or transition pole teeth
  • the axial pole teeth are disposed on the step and/or the inner wall of the pole piece corresponding to the step
  • the transition pole teeth are disposed on the transition surface and/or Or on the inner wall of the pole piece corresponding to the transition surface.
  • the number of steps is 3-11, the number of transition faces is 2-10, and the number of pole pieces is 2-10.
  • the convex step portion includes one first step, two second steps, and two third steps, and the diameters of the first step, the second step, and the third step are sequentially decreased. Small, the two second steps and the two third steps are symmetrically distributed on both sides of the first step.
  • the gap size is 0.05-5 mm, preferably 2-5 mm.
  • annular groove is disposed on the outer wall of the pole piece, and a sealing ring is disposed in the annular groove.
  • the outer sides of the outermost two pole pieces are respectively provided with a first magnetic isolation ring and a second magnetic isolation ring.
  • the number of the bearings is two, which are respectively a first bearing and a second bearing, and are respectively disposed on both sides of the step portion.
  • end cap is detachably fixed to the right end of the outer casing.
  • the end cap is threadedly secured to the right end of the housing.
  • the sealing device of the invention can solve the problem of insufficient pressure resistance of the sealing device under large gap conditions.
  • a convex stepped shaft convex arc stepped shaft
  • the arc-shaped pole piece has a radially inner annular surface and a circular arc type
  • the side surface (the curved surface corresponding to the curved chamfered transition surface) is uniformly provided with correspondingly shaped pole teeth, and the permanent magnet is embedded between the pole pieces, and the radial direction formed by the pole piece and the convex arc stepped shaft A magnetic fluid is injected into the sealing gap of the circular arc surface to realize a convex stepped shaft magnetic fluid seal.
  • the invention improves the structure of the shaft by setting a multi-stage magnetic source and improving the distribution form of the pole teeth on the pole piece on the basis of the stepped magnetic fluid seal, and improves the structure of the shaft to improve the rectangular stepped shaft into a convex arc stepped shaft, thereby making the magnetic fluid seal
  • the pressure resistance is greatly enhanced; the convex arc type sealing structure can reduce the loss of magnetic fluid when the seal fails, reduce the stress concentration, facilitate the production and processing, and increase the secondary pressure bearing capacity and self-repairing ability of the sealing device. Further improve the pressure resistance and sealing reliability of the magnetic fluid seal under large gap conditions, and expand its safe working range.
  • the magnetic fluid sealing device of the invention has strong pressure resistance and convenient production and processing; when the sealing fails, the magnetic fluid loss is small, the secondary pressure bearing capacity and the self-repairing ability are strong, and the pressure resistance of the device under the large gap condition is effectively increased. Capacity and sealing reliability to extend the safe working range.
  • FIG. 1 is a cross-sectional structural view showing a magnetic fluid sealing device according to a first embodiment of the present invention.
  • a convex stepped shaft magnetic fluid sealing device comprises a housing 2 with an open end, a sealing assembly and an end cap 10 for pressing the sealing assembly into the housing 2; the sealing assembly comprises a shaft 1
  • the shaft 1 is rotatably mounted in the outer casing 2 by a bearing.
  • the shaft 1 includes a convex step portion 101 including five steps arranged in the axial direction, between the outer walls of adjacent steps.
  • each transition surface jacket is provided with a pole piece matching the transition surface, the pole piece extending to the outer side of the transition surface (the diameter of the transition surface is reduced) to the corresponding step on the side of the transition surface
  • a gap is left between the inner wall of the pole piece and the corresponding transition surface and the step, and the inner wall of the pole piece and the portion corresponding to the inner wall of the pole piece on the shaft 1 are provided with pole teeth; adjacent pole pieces There are permanent magnets between them.
  • the convex step portion 101 includes one first step 1011, two second steps 1012, and two third steps 1013.
  • the diameters of the first step 1011, the second step 1012, and the third step 1013 are sequentially decreased. Small, the two second steps 1012 and the two third steps 1013 are symmetrically distributed on both sides of the first step 1011.
  • Each adjacent step is connected by a rounded transition surface. Outside the step, from left to right, a position corresponding to each transition surface is respectively provided with a left pole piece 22, a left second pole piece 19, and a right second.
  • the pole piece 17 and the right pole piece 15 are. From left to right, each of the adjacent pole pieces is respectively provided with a left permanent magnet 7, an intermediate permanent magnet 8 and a right permanent magnet 9, and the adjacent side magnetic poles of the adjacent permanent magnets are the same.
  • the pole teeth include axial pole teeth and transition pole teeth, the axial pole teeth are disposed on the inner wall of the pole piece corresponding to the step, and the transition pole teeth are disposed on the transition surface.
  • the left outer pole piece 22 is provided with a first left axial pole tooth 5 on the inner wall corresponding to the third step 1013, and the first left transition pole tooth 6 is provided on the transition surface corresponding to the left pole piece 22
  • the left second pole piece 19 is provided with a second left axial pole tooth on the inner wall corresponding to the second step 1012, and a second left transition pole tooth is provided on the transition surface corresponding to the left pole piece 19 .
  • a first right axial pole tooth 11 is disposed on an inner wall of the right pole piece 15 corresponding to the third step 1013, and a first right transition pole tooth 10 is disposed on a transition surface corresponding to the right pole piece 15;
  • the inner wall of the pole piece 17 corresponding to the second step 1012 is provided with a second right axial pole tooth, and the transition surface corresponding to the right second pole shoe 17 is provided with a second right transition tooth.
  • the gap size is 3 mm.
  • An annular groove is disposed on an outer wall of the pole piece, and a sealing ring is disposed in the annular groove.
  • the left first sealing ring 21, the left second sealing ring 20, and the right are respectively disposed in the annular grooves on the outer wall of the left pole piece 22, the left second pole piece 19, the right second pole piece 17 and the right first pole piece 15 respectively.
  • Two sealing rings 18 and a right sealing ring 16 are respectively disposed in the annular grooves on the outer wall of the left pole piece 22, the left second pole piece 19, the right second pole piece 17 and the right first pole piece 15 respectively.
  • the outer side of the outermost two pole pieces are respectively provided with a first magnetic blocking ring 4 and a second magnetic blocking ring 12.
  • the number of the bearings is two, which are the first bearing 3 and the second bearing 13, respectively, and are disposed outside the first magnetic isolation ring 4 and the second magnetic isolation ring 12, respectively.
  • the end cover 14 is detachably fixed to the right end of the outer casing 2.
  • the right second pole shoe 17, the right first permanent magnet 9, and the right first pole shoe 15 are sequentially mounted on the shaft 1 from the right side of the shaft;
  • the second magnetic isolation ring 12 and the second bearing 13 are sequentially mounted on the shaft 1 from the right side of the shaft to form a sealing assembly;
  • the sealing assembly is mounted in the outer casing 2, and the outer ring of the right bearing 13 is pressed by the screw connection of the end cover 14 and the outer casing 2; a convex stepped shaft magnetic fluid seal is realized.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

公开了一种凸阶梯轴磁流体密封装置，包括外壳(2)、密封组件和端盖(14)；密封组件包括轴(1)，轴(1)通过轴承转动地安装于外壳(2)内，轴(1)包括至少一个凸阶梯部(101)，凸阶梯部(101)包括多个依次沿轴向排列的台阶，相邻台阶的外壁之间通过弧形倒角状过渡面连接；每个过渡面外套设有与该过渡面匹配的极靴，极靴向过渡面一侧或两侧方向延伸至该过渡面侧部相应台阶所对应位置，极靴的内壁与相应过渡面、台阶之间均留有间隙，极靴内壁上和/或轴(1)上与极靴内壁相对应的部位开设有极齿；相邻极靴之间设有永磁体。该磁流体密封装置耐压能力强，二次承压能力和自修复能力强，大间隙条件下磁性流体密封的耐压能力和密封可靠性强，安全工作范围大。

Description

一种凸阶梯轴磁流体密封装置 技术领域
本发明涉及一种凸阶梯轴磁流体密封装置，属于机械工程密封领域。
背景技术
磁流体密封是借助磁流体在强磁场的作用下形成的磁流体密封环对气体、液体进行密封，由于它与密封轴之间是通过磁流体进行接触封密，因而避免了密封轴与密封件的直接摩擦和降低了附加载荷，此外磁流体密封还具有零泄漏、可靠性高、结构简单等特点。尽管磁流体在真空低压密封上技术己经比较成熟，也得到了比较广泛的应用，但在高压气体密封和液体密封上，还有很多问题没有解决，如磁流体密封压力过小、被密封的介质会引起磁流体的变质而导致密封迅速失效等，密封难度大，离实际应用还有一定的差距。因此，如何合理设计磁性流体密封结构参数，提高永磁体的利用效率，增强密封耐压能力也是目前磁流体密封技术一项有意义的研究内容。
提高大间隙下磁性流体密封耐压性能的方法之一是通过增加磁流体密封磁路中磁源的数量并改进极靴的形状，如对比文献1(公开号为CN204805552U的专利)所述的密封装置和对比文献2(公开号为CN202418592U的专利)所述的密封装置。尽管以上文献所述的两种密封装置相对普通磁性流体密封性能得到极大的提高，但现有密封结构的密封性能仍有进一步提高的空间。
磁流体在静态时不具磁性，仅在外加磁场作用时，才表现出磁性。磁性微粒和载液浑成一体，从而使磁流体既具有普通磁性材料的磁性，同时又具有液体的流动性，因此具有很多独特的性质。
相对普通单一磁源磁性流体密封或普通多磁源磁流体密封而言，现有密 封装置增加磁场力强度从而使得密封性能得到极大的提高，但依旧满足不了高速重载场合较高密封性能的要求。
发明内容
本发明的目的是提供一种凸阶梯轴磁流体密封装置，从而解决现有单磁源磁流体密封装置和多磁源磁流体密封装置存在的耐压性能低的难题，同时减小应力集中，使得该密封技术成功应用于高速重载等领域中。
为了解决上述技术问题，本发明的技术方案如下：一种凸阶梯轴磁流体密封装置，包括两端开口的外壳、密封组件和用于将密封组件压紧于外壳内的端盖；所述密封组件包括轴，所述轴通过轴承转动地安装于外壳内，所述轴包括至少一个凸阶梯部，所述凸阶梯部包括多个依次沿轴向排列的台阶，相邻台阶的外壁之间通过弧形倒角状过渡面连接；每个过渡面外套设有与该过渡面匹配的极靴，所述极靴向过渡面一侧或两侧方向延伸至该过渡面侧部相应台阶所对应位置，所述极靴的内壁与相应过渡面、台阶之间均留有间隙，所述极靴内壁上和/或轴上与极靴内壁相对应的部位开设有极齿；相邻极靴之间设有永磁体。
进一步地，相邻台阶的外壁之间通过圆角状过渡面连接。
进一步地，极靴与圆角状过渡面相对应部分，极靴内环面的圆弧曲率半径大于轴上相应过渡面的圆弧曲率半径；进一步地，极靴内环面的圆弧曲率半径为3～43mm；相应的，轴上圆弧的曲率半径为2～40mm。
进一步地，当单个凸阶梯部中台阶的数量超过2个时，沿轴向分布的相邻永磁体的相邻侧磁极相同。
进一步地，所述极齿包括轴向极齿和/或过渡极齿，轴向极齿设置于台阶 上和/或与台阶相对应的极靴内壁上，过渡极齿设置于过渡面上和/或与过渡面相对应的极靴内壁上。
优选地，单个凸阶梯部中，台阶的数量为3-11个，过渡面的数量为2-10个，极靴的数量为2-10个。
作为本发明的一种实施方式，所述凸阶梯部包括1个第一台阶、2个第二台阶和2个第三台阶，所述第一台阶、第二台阶和第三台阶的直径依次减小，所述2个第二台阶和2个第三台阶依次对称分布于第一台阶两侧。
进一步地，所述间隙大小为0.05-5mm，优选为2-5mm。
进一步地，所述极靴的外壁上设有环状凹槽，所述环状凹槽内设有密封圈。
进一步地，单个凸阶梯部中，最外侧的两个极靴的外侧分别设有第一隔磁环和第二隔磁环。
进一步地，所述轴承的数量为两个，分别为第一轴承和第二轴承，且分别设置于阶梯部的两侧。
进一步地，所述端盖可拆卸地固定于外壳右端。优选地，所述端盖通过螺纹固定于外壳右端。
本发明的密封装置可解决大间隙条件下密封装置耐压能力不足的难题。通过设计一种带有弧形倒角状过渡面的凸阶梯式转轴(凸圆弧阶梯轴)和圆弧式极靴结构，优选地，圆弧式极靴径向内环面和圆弧式侧面(与弧形倒角状过渡面相对应的弧形面)上均布开设相应形状的极齿，将永磁体嵌入在极靴之间，在极靴与凸圆弧阶梯轴形成的径向和圆弧面方向密封间隙内注入磁流体，从而实现一种凸阶梯轴磁流体密封。本发明在阶梯式磁流体密封基础上，通过设置多级磁源及改进极靴上极齿的分布形式，改进轴的结构，将矩形阶 梯轴改进为凸圆弧阶梯轴，从而使得磁流体密封耐压能力大大增强；凸圆弧式的密封结构可减小密封失效时磁流体的损失，减小应力集中，方便生产与加工，同时增加密封装置的二次承压能力和自修复能力。进一步提高大间隙条件下磁性流体密封的耐压能力和密封可靠性，扩大了其安全工作范围。
综上，本发明的磁流体密封装置耐压能力强，生产加工方便；密封失效时，磁流体的损失小，二次承压能力和自我修复能力强，有效增大大间隙条件下装置的耐压能力和密封可靠性，从而扩大安全工作范围。
附图说明
图1是本发明第一种实施方式的磁流体密封装置的剖面结构示意图。
具体实施方式
以下将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本发明中的实施例及实施例中的特征可以相互组合。为叙述方便，下文中如出现“上”、“下”、“左”、“右”字样，仅表示与附图本身的上、下、左、右方向一致，并不对结构起限定作用。
如图1所示，一种凸阶梯轴磁流体密封装置，包括两端开口的外壳2、密封组件和用于将密封组件压紧于外壳2内的端盖10；所述密封组件包括轴1，所述轴1通过轴承转动地安装于外壳2内，所述轴1包括一个凸阶梯部101，所述凸阶梯部101包括5个依次沿轴向排列的台阶，相邻台阶的外壁之间通过圆角状过渡面连接；每个过渡面外套设有与该过渡面匹配的极靴，所述极靴向过渡面外侧方向(过渡面直径缩减方向)延伸至该过渡面侧部相应台阶所对应位置，所述极靴的内壁与相应过渡面、台阶之间均留有间隙，所述极靴内壁上和轴1上与极靴内壁相对应的部位开设有极齿；相邻极靴之间设有 永磁体。
其中，所述凸阶梯部101包括1个第一台阶1011、2个第二台阶1012和2个第三台阶1013，所述第一台阶1011、第二台阶1012和第三台阶1013的直径依次减小，所述2个第二台阶1012和2个第三台阶1013依次对称分布于第一台阶1011两侧。各相邻台阶之间通过圆角状过渡面连接，所述阶梯部外，从左至右，与各过渡面相对应的位置分别套设有左一极靴22、左二极靴19、右二极靴17和右一极靴15。从左至右，上述各相邻极靴之间分别设有左一永磁体7、中间永磁体8和右一永磁体9，相邻永磁体的相邻侧磁极相同。
所述极齿包括轴向极齿和过渡极齿，轴向极齿设置于与台阶相对应的极靴内壁上，过渡极齿设置于过渡面上。相应地，左一极靴22与第三台阶1013相对应的内壁上设有第一左轴向极齿5，与左一极靴22相对应的过渡面上设有第一左过渡极齿6；左二极靴19与第二台阶1012相对应的内壁上设有第二左轴向极齿，与左二极靴19相对应的过渡面上设有第二左过渡极齿。右一极靴15与第三台阶1013相对应的内壁上设有第一右轴向极齿11，与右一极靴15相对应的过渡面上设有第一右过渡极齿10；右二极靴17与第二台阶1012相对应的内壁上设有第二右轴向极齿，与右二极靴17相对应的过渡面上设有第二右过渡极齿。
所述间隙大小为3mm。
所述极靴的外壁上设有环状凹槽，所述环状凹槽内设有密封圈。相应地，左一极靴22、左二极靴19、右二极靴17和右一极靴15外壁上的环状凹槽内分别设有左一密封圈21、左二密封圈20、右二密封圈18和右一密封圈16。
单个凸阶梯部中，最外侧的两个极靴的外侧分别设有第一隔磁环4和第二 隔磁环12。
所述轴承的数量为两个，分别为第一轴承3和第二轴承13，且分别设置于第一隔磁环4和第二隔磁环12的外侧。
所述端盖14可拆卸地固定于外壳2右端。
装配时，主要包括如下步骤：
(1)将左一密封圈21安装在左一极靴22外圆面上的凹槽内；
将左二密封圈20安装在左二极靴19外圆面上的凹槽内；
将右二密封圈18安装在右二极靴17外圆面上的凹槽内；
将右一密封圈16安装在右一极靴15外圆面上的凹槽内；
(2)将中间永磁体8、左二极靴19、左一永磁体7、左一极靴22从轴的左侧依次安装在轴1上；
将磁流体注入在左一极靴22、左二极靴19与轴1形成的密封间隙内；
将右二极靴17、右一永磁体9、右一极靴15从轴的右侧依次安装在轴1上；
将磁流体注入在右二极靴17、右一极靴15与轴1形成的密封间隙内；
(3)将第一隔磁环4、第一轴承3从轴的左侧顺依次安装在轴1上；
将第二隔磁环12、第二轴承13从轴的右侧依次安装在轴1上，形成密封组件；
(4)将密封组件安装在外壳2内，通过端盖14与外壳2的螺纹连接压紧右轴承13的外圈；实现一种凸阶梯轴磁流体密封。
上述实施例阐明的内容应当理解为这些实施例仅用于更清楚地说明本发明，而不用于限制本发明的范围，在阅读了本发明之后，本领域技术人员对本发明的各种等价形式的修改均落入本申请所附权利要求所限定的范围。

Claims (10)

  1. 一种凸阶梯轴磁流体密封装置，包括两端开口的外壳(2)、密封组件和用于将密封组件压紧于外壳(2)内的端盖(10)；所述密封组件包括轴(1)，所述轴(1)通过轴承转动地安装于外壳(2)内，其特征在于，所述轴(1)包括至少一个凸阶梯部(101)，所述凸阶梯部(101)包括多个依次沿轴向排列的台阶，相邻台阶的外壁之间通过弧形倒角状过渡面连接；每个过渡面外套设有与该过渡面匹配的极靴，所述极靴向过渡面一侧或两侧方向延伸至该过渡面侧部相应台阶所对应位置，所述极靴的内壁与相应过渡面、台阶之间均留有间隙，所述极靴内壁上和/或轴(1)上与极靴内壁相对应的部位开设有极齿；相邻极靴之间设有永磁体。
  2. 根据权利要求1所述的凸阶梯轴磁流体密封装置，其特征在于，相邻台阶的外壁之间通过圆角状过渡面连接。
  3. 根据权利要求1所述的凸阶梯轴磁流体密封装置，其特征在于，当台阶的数量超过2个时，沿轴向分布的相邻永磁体的相邻侧磁极相同。
  4. 根据权利要求1所述的凸阶梯轴磁流体密封装置，其特征在于，所述极齿包括轴向极齿和/或过渡极齿，轴向极齿设置于台阶上和/或与台阶相对应的极靴内壁上，过渡极齿设置于过渡面上和/或与过渡面相对应的极靴内壁上。
  5. 根据权利要求1所述的凸阶梯轴磁流体密封装置，其特征在于，所述凸阶梯部(101)包括1个第一台阶(1011)、2个第二台阶(1012)和2个第三台阶(1013)，所述第一台阶(1011)、第二台阶(1012)和第三台阶(1013)的直径依次减小，所述2个第二台阶(1012)和2个第三台阶(1013)依次对称分布于第一台阶(1011)两侧。
  6. 根据权利要求1所述的凸阶梯轴磁流体密封装置，其特征在于，所述间隙大小为0.05-5mm。
  7. 根据权利要求1所述的凸阶梯轴磁流体密封装置，其特征在于，所述极靴的外壁上设有环状凹槽，所述环状凹槽内设有密封圈。
  8. 根据权利要求1所述的凸阶梯轴磁流体密封装置，其特征在于，单个凸阶梯部中，最外侧的两个极靴的外侧分别设有第一隔磁环(4)和第二隔磁环(12)。
  9. 根据权利要求1所述的凸阶梯轴磁流体密封装置，其特征在于，所述轴承的数量为两个，分别为第一轴承(3)和第二轴承(13)，且分别设置于阶梯部的两侧。
  10. 根据权利要求1所述的凸阶梯轴磁流体密封装置，其特征在于，所述端盖(14)可拆卸地固定于外壳(2)右端。
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CN107893853B (zh) * 2017-12-13 2021-02-12 广西科技大学 一种凸阶梯轴磁流体密封装置
CN108980358A (zh) * 2018-08-13 2018-12-11 广西科技大学 一种阶梯极齿型磁流体密封结构
CN112178199A (zh) * 2020-09-10 2021-01-05 上海宇航系统工程研究所 一种采用螺纹连接轴的磁流体密封装置
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