WO2015035871A1 - 磁悬浮轴承及离心式压缩机 - Google Patents

磁悬浮轴承及离心式压缩机 Download PDF

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Publication number
WO2015035871A1
WO2015035871A1 PCT/CN2014/085827 CN2014085827W WO2015035871A1 WO 2015035871 A1 WO2015035871 A1 WO 2015035871A1 CN 2014085827 W CN2014085827 W CN 2014085827W WO 2015035871 A1 WO2015035871 A1 WO 2015035871A1
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WIPO (PCT)
Prior art keywords
magnetic suspension
protection mechanism
suspension bearing
rotating shaft
electromagnetic device
Prior art date
Application number
PCT/CN2014/085827
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English (en)
French (fr)
Inventor
黄辉
胡余生
陈东锁
张芳
张小波
刘健宁
Original Assignee
珠海格力节能环保制冷技术研究中心有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 珠海格力节能环保制冷技术研究中心有限公司 filed Critical 珠海格力节能环保制冷技术研究中心有限公司
Priority to DK14844794.9T priority Critical patent/DK3045752T3/da
Priority to KR1020167009726A priority patent/KR20160055263A/ko
Priority to EP14844794.9A priority patent/EP3045752B1/en
Priority to JP2016541785A priority patent/JP6574777B2/ja
Priority to US15/021,473 priority patent/US10190628B2/en
Publication of WO2015035871A1 publication Critical patent/WO2015035871A1/zh

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Classifications

    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0474—Active magnetic bearings for rotary movement
    • F16C32/0476—Active magnetic bearings for rotary movement with active support of one degree of freedom, e.g. axial magnetic bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0442—Active magnetic bearings with devices affected by abnormal, undesired or non-standard conditions such as shock-load, power outage, start-up or touchdown
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C39/00—Relieving load on bearings
    • F16C39/02—Relieving load on bearings using mechanical means
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/44—Centrifugal pumps
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2362/00—Apparatus for lighting or heating
    • F16C2362/52—Compressors of refrigerators, e.g. air-conditioners

Definitions

  • the present invention relates to a magnetic suspension bearing and a centrifugal compressor, and more particularly to a magnetic suspension shaft and a centrifugal compressor having a protective structure.
  • the magnetic suspension bearing relies on the current flowing in the winding, and the generated magnetic field forms a loop between the iron core and the thrust plate to form an electromagnetic attraction between the iron core and the thrust plate; and the displacement sensor is used to test the air gap between the rotating shaft and the stator.
  • Distance by adjusting the current of the bearing winding, adjusting the electromagnetic force to control the value of the air gap between the shaft and the stator, to achieve the purpose of stable suspension.
  • the magnetic suspension bearing bears more radial load
  • the auxiliary bearing is used to protect the radial load of the bearing from being out of control
  • the axial protection of the bearing is basically not mentioned.
  • Magnetic suspension bearings are used in the field of centrifugal compressors, mainly for axial loads.
  • FIG. 1 is a schematic cross-sectional view of a conventional magnetic suspension bearing 100 including a rotating shaft 110, a core 120, a thrust plate 130 and a wire 150.
  • the thrust plate 1 30 is fixed on the rotating shaft 110, and the thrust disk 130 is maintained at a certain distance L from the iron core 120, wherein L>0. After the magnetic suspension bearing is energized, due to the attraction of the electromagnetic force, when the control precision is not high, or the control system is out of control, the thrust plate 1 30 approaches the iron core 120, and finally collides with the iron core 120, the iron The core 120 or the thrust plate 1 30 may be damaged.
  • a magnetic suspension bearing of the present invention comprises a rotating shaft and an electromagnetic device, wherein the electromagnetic device is distributed on the outer circumference of the rotating shaft, and has a gap with the rotating shaft for adjusting the position of the rotating shaft;
  • the electromagnetic device includes an iron core and a winding having a winding groove, and the wire is placed in the winding groove, and the magnetic suspension bearing further includes a protection mechanism for preventing the rotating shaft from colliding with the electromagnetic device.
  • the magnetic suspension bearing further includes a thrust plate
  • the thrust plate is fixed on the rotating shaft
  • the protection mechanism is fixed to the electromagnetic device, and the protection mechanism is placed on an outer circumference of the thrust plate.
  • the protection mechanism maintains a gap between the thrust plate and the electromagnetic device at L, where L>0.
  • the protection mechanism includes a support body and an outer cover layer
  • the outer cover is fixed to an outer surface of the support, and the outer cover is made of a wear-resistant non-magnetic material.
  • the protection mechanism is fixed to the inner side, the outer side of the iron core or the winding groove.
  • the protection mechanism is fixed on the inner side of the iron core, and a positioning groove is disposed on the inner side wall of the iron core for axially positioning the protection mechanism.
  • the magnetic suspension bearing further includes a base, the base is configured to receive the rotating shaft and the electromagnetic device;
  • the protection mechanism is fixed to the base.
  • the protection mechanism is placed in an intermediate position of the base.
  • the protection mechanism is fixed by a heat jacket, an adhesive or an assembly.
  • a centrifugal compressor includes the magnetic suspension bearing.
  • the protection mechanism of the magnetic suspension bearing keeps the thrust plate and the iron core at a certain distance.
  • the thrust plate does not collide with the iron core, and the thrust plate or the thrust plate is avoided.
  • the core is damaged; the thrust plate and the iron core cannot be completely absorbed.
  • the protection mechanism is made of wear-resistant non-magnetic material, which does not affect.
  • the magnetic circuit structure has no influence on the bearing capacity; the protection mechanism is easy to install and position, and has strong practicability, which is convenient for modification of existing products and maintenance after loss; centrifugal compressor using the magnetic suspension bearing, axially protected , long service life.
  • FIG. 1 is a schematic cross-sectional view of a conventional magnetic suspension bearing
  • Figure 1 is a cross-sectional view showing a first embodiment of a magnetic suspension bearing of the present invention
  • Figure 3 is a cross-sectional view showing a second embodiment of the magnetic suspension bearing of the present invention.
  • Figure 4 is a cross-sectional view showing a third embodiment of the magnetic suspension bearing of the present invention.
  • Figure 5 is a cross-sectional view showing a fourth embodiment of the magnetic suspension bearing of the present invention. detailed description In order to solve the problem of axial protection of magnetic suspension bearings, a magnetic suspension bearing is proposed to realize axial protection and centrifugal compressor.
  • the magnetic suspension bearing 100 includes a rotating shaft 110, a core 120, a thrust plate 130, a protection mechanism 140 and a wire 150.
  • the rotating shaft 110 is a high-speed rotating shaft
  • the thrust plate 130 is fixed to one end of the rotating shaft 110
  • the iron core 120 has a winding groove
  • the winding 150 is placed in the winding groove, the line ⁇ 150 is connected to the circuit.
  • the protection mechanism 140 is not capable of guiding the magnetic material, so that the installation of the protection mechanism 140 does not affect the magnetic circuit structure, and has no influence on the bearing capacity of the magnetic suspension bearing 100.
  • the protection mechanism 140 includes a support body and an outer cover layer (not shown), the outer cover layer is covered and fixed on an outer surface of the support body, and the outer cover layer is made of a wear-resistant non-magnetic material Made.
  • the protection mechanism 140 is a cylinder in which the number of the protection mechanisms 140 is at least one.
  • the protection mechanism 140 maintains a certain distance L between the thrust plate 1 30 and the iron core 120, wherein, L
  • the thrust plate 1 30 When the coil 150 is energized, the thrust plate 1 30 is subjected to electromagnetic attraction, and the control system causes the magnetic suspension bearing 100 to operate at a center position, at which time the distance L is a rated value and is set to L. .
  • the attraction of the electromagnetic force causes the thrust plate 1 30 to approach the iron core 120; due to the presence of the protection mechanism 140, when the axial load is out of control, the The thrust plate 1 30 does not collide with the iron core 120 to prevent the thrust disk 1 30 or the iron core 120 from being damaged.
  • the thrust plate 1 30 and the iron core 120 cannot be completely absorbed. After the magnetic suspension bearing 100 is powered off, the residual magnetic flux after the power failure is prevented from being excessive. The pusher disk 1 30 and the iron core 120 cannot be quickly separated.
  • the protection mechanism 140 is fixed by a heat sleeve, an adhesive or an assembly method, and is convenient to install and position, and has strong practicability, and is convenient for modification of existing products and maintenance after loss.
  • the protection mechanism 140 is fixed to the inner side of the iron core 120, and a positioning groove 122 is disposed on the inner side wall of the iron core 120 for axially positioning the protection mechanism 140.
  • the positioning groove 122 should be as small as possible, but the relevant bearing capacity and the structure of the protection mechanism 140 are required to be strong. Degree requirements.
  • FIG. 3 which is a cross-sectional view of a second embodiment of the magnetic levitation bearing of the present invention
  • the protection mechanism 140 is fixed to the outer side of the core 120.
  • FIG. 4 which is a cross-sectional view of a third embodiment of the magnetic suspension bearing of the present invention, the protection mechanism 140 is fixed in the winding groove of the core 120.
  • the protection mechanism 140 is fixed to the inner side of the iron core 120, the outer side or the winding groove of the iron core 120.
  • the distance between the thrust plate 130 and the iron core 120 is L ⁇ , The push plate 1 30 is in contact with the protection mechanism 140.
  • the protection plate 140 In the case where the axial load of the magnetic levitation bearing 100 is out of control, the protection plate 140 is in contact with the protection mechanism 140 at a high speed, and does not contact the iron core 120, avoiding two The collision occurs to protect the thrust plate 1 30 and the iron core 120, and the mechanical structure of the thrust disk 130 and the iron core 120 is ensured to be good, and the service life is prolonged.
  • the support body of the protection mechanism 140 has a high hardness and can withstand a large axial force.
  • the outer cover of the protection mechanism 140 can have a certain elasticity and serve the purpose of buffering collision.
  • the magnetic levitation bearing 100 further includes a base 160, and the iron core 120 is placed on the thrust plate 1 30 and Between the pedestals 160.
  • the protection mechanism 140 is fixed to the base 160, and preferably, the protection mechanism 140 is placed at an intermediate position of the base 160.
  • the distance between the thrust plate 1 30 and the core 120 is L Bin , the end of the rotating shaft 110 contacts the protection mechanism 140.
  • the rotating shaft 110 is smaller than the diameter of the thrust plate 1 30, the linear speed of the rotating shaft 110 is small, and when the end of the rotating shaft 110 contacts the protection mechanism 140, the protection mechanism 140 is The frictional force is relatively small, and the closer the protection mechanism 140 is to the center of the base 160, the smaller the frictional force.
  • a centrifugal compressor comprising the magnetic suspension bearing 100, which can effectively protect the magnetic suspension bearing 100 in actual use, has a long service life, and can be quickly separated after power failure.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

一种磁悬浮轴承及离心式压缩机，包括转轴（110）和电磁装置，所述电磁装置分布在所述转轴（110）的外周，与所述转轴（110）之间具有间隙，用于调节所述转轴（110）的位置；所述电磁装置包括具有绕组槽的铁芯（120）和线圈（150），线圈（150）置于绕组槽内，所述磁悬浮轴承（100）还包括保护机构（140），用于防止所述转轴（110）碰撞所述电磁装置，达到轴向保护所述磁悬浮轴承（100）的目的。离心式压缩机，包括所述的磁悬浮轴承（100），得到了轴向保护，延长了使用寿命。

Description

磁悬浮轴承及离心式压缩机
相关申请
本专利申请要求 201 3年 9月 1 3 日申请的, 申请号为 201 310419738. 7 , 名称为 "磁 悬浮轴承及离心式压缩机" 的中国专利申请的优先权， 在此将其全文引入作为参考。 技术领域
本发明涉及一种磁悬浮轴承及离心式压缩机， 特别是涉及一种具有保护结构的磁悬浮 轴 及离心式压缩机。 背景技术
磁悬浮轴承依靠绕组中通入电流， 产生的磁场在铁芯与止推盘之间形成回路， 使铁芯 和止推盘之间形成电磁吸力； 并利用位移传感器测试转轴与定子之间气隙的距离， 通过调 节轴承绕组的电流大小， 调节电磁力的作用来控制转轴与定子之间气隙的数值， 来达到稳 定悬浮的目的。
现有的磁悬浮轴承保护系统中， 一般情况下， 磁悬浮轴承多承担径向负载， 釆用辅助 轴承对轴承的径向进行负载失控时的保护， 对轴承的轴向保护基本未提及。 而磁悬浮轴承 应用在离心式压缩机领域， 主要承担轴向负载。
请参阅图 1所示， 图 1为现有的磁悬浮轴承的剖视示意图， 所述磁悬浮轴承 100包括 转轴 110、 铁芯 120、 止推盘 1 30与线圏 150。
所述止推盘 1 30固定于所述转轴 110上， 所述止推盘 1 30与所述铁芯 120之间维持一 定的距离 L , 其中， L〉0。 磁悬浮轴承通电后， 由于电磁力的吸引， 当控制精度不高， 或 控制系统失控时， 所述止推盘 1 30向所述铁芯 120靠近， 最后碰撞到所述铁芯 120 , 所述 铁芯 120或所述止推盘 1 30会发生损坏。
鉴于上述缺陷， 本发明人经过长时间的研究和实践终于获得了本发明创造。 发明内容
基于此， 有必要提供一种能避免轴向受力的磁悬浮轴承及离心式压缩机。
本发明的一种磁悬浮轴承， 包括转轴和电磁装置， 电磁装置分布在转轴的外周， 与转 轴之间具有间隙， 用于调节转轴的位置；
电磁装置包括具有绕组槽的铁芯和线圏， 线圏置于绕组槽内 , 所述磁悬浮轴承还包括 保护机构 , 用于防止所述转轴碰撞所述电磁装置。
作为一种可实施方式， 所述的磁悬浮轴承还包括止推盘；
所述止推盘固定于所述转轴上；
所述保护机构固定在所述电磁装置上， 所述保护机构置于所述止推盘的外周。
作为一种可实施方式， 所述保护机构将所述止推盘与所述电磁装置之间的间隙维持在 L , 其中 L〉 0。
作为一种可实施方式， 所述保护机构包括支撑体和外覆层；
所述外覆层固定在所述支撑体的外表面上， 所述外覆层由耐磨的不导磁材料制成。 作为一种可实施方式， 所述保护机构固定于所述铁芯的内侧、 外侧或所述绕组槽内。 作为一种可实施方式， 所述保护机构固定在所述铁芯的内侧， 在所述铁芯的内侧壁上 设置有定位槽， 用于轴向定位所述保护机构。
作为一种可实施方式， 所述的磁悬浮轴承还包括基座， 所述基座用于容纳所述转轴与 所述电磁装置；
所述保护机构固定到所述基座上。
作为一种可实施方式， 所述保护机构置于所述基座的中间位置。
作为一种可实施方式， 所述保护机构通过热套、 粘胶或组装方式固定。
一种离心式压缩机， 包括所述的磁悬浮轴承。
与现有技术比较本发明的有益效果在于： 磁悬浮轴承的保护机构使止推盘与铁芯保持 一定距离， 在轴向负载失控时， 止推盘不会碰撞到铁芯， 避免止推盘或铁芯发生损坏； 止 推盘与铁芯无法完全吸合避免了断电后， 剩磁过大导致止推盘与铁芯不能迅速分离； 保护 机构使用耐磨的非导磁材料制作， 不影响磁路结构， 对承载力无影响； 保护机构安装和定 位很方便， 实用性很强， 便于现有产品的改装和损耗后的维修； 使用所述磁悬浮轴承的离 心式压缩机， 轴向得到保护， 使用寿命较长。 附图说明
图 1为现有的磁悬浮轴承的剖视示意图；
图 1为本发明的磁悬浮轴承的第一实施例的剖视示意图；
图 3为本发明的磁悬浮轴承的第二实施例的剖视示意图；
图 4为本发明的磁悬浮轴承的第三实施例的剖视示意图；
图 5为本发明的磁悬浮轴承的第四实施例的剖视示意图。 具体实施方式 为了解决磁悬浮轴承轴向无保护的问题， 提出了一种磁悬浮轴承来实现轴向保护及离 心式压缩机。
以下结合附图， 对本发明上述的和另外的技术特征和优点作更详细的说明。
请参阅图 2所示， 其为本发明的磁悬浮轴承的第一实施例的剖视示意图， 所述磁悬浮 轴承 100包括转轴 110、 铁芯 120、 止推盘 130、 保护机构 140与线圏 150。
所述转轴 110为高速旋转轴， 所述止推盘 1 30固定于所述转轴 110的一端， 所述铁芯 120上具有绕组槽， 所述绕组槽内放置所述线圏 150 , 所述线圏 150连接电路。
所述保护机构 140不能导磁材料， 这样所述保护机构 140的安装不影响磁路结构， 对 所述磁悬浮轴承 100的承载力无影响。所述保护机构 140包括支撑体和外覆层（未示出）， 所述外覆层覆盖并固定在所述支撑体的外表面上， 所述外覆层由耐磨的不导磁材料制作而 成。
所述保护机构 140为柱体， 在所述磁悬浮轴承 100中所述保护机构 140的数量为至少 一个。
所述保护机构 140将所述止推盘 1 30与所述铁芯 120之间维持一定的距离 L , 其中， L
> 0。
所述线圏 150通电时， 所述止推盘 1 30受到电磁吸力作用， 控制系统使所述磁悬浮轴 承 100工作在中心位置， 此时距离 L为额定值， 设为 L。。
所述线圏 150通电后， 由于所述止推盘 1 30受到电磁吸力作用， 所述止推盘 1 30向所 述铁芯 120靠近， 直到距离 L达到最小值， 设为 LBin, 其中， L。〉LBin〉0。 当 LBin= ( 0. 5— 0. 8 ) L。时， 所述磁悬浮轴承 100达到较优的保护效果， 且所述磁悬浮轴承 100的内部布置 紧凑。
所述磁悬浮轴承 100通电后， 受电磁力的吸引， 会使所述止推盘 1 30向所述铁芯 120 靠近； 由于有所述保护机构 140的存在， 在轴向负载失控时， 所述止推盘 1 30不会碰撞到 所述铁芯 120 , 避免所述止推盘 1 30或所述铁芯 120发生损坏。
同时， 由于有所述保护机构 140的存在， 所述止推盘 1 30与所述铁芯 120无法完全吸 合， 所述磁悬浮轴承 100断电后， 避免了断电后剩磁过大， 止推盘 1 30与所述铁芯 120不 能迅速分离。
所述保护机构 140通过热套、粘胶或组装方式固定，安装和定位很方便，实用性很强， 便于现有产品的改装和损耗后的维修。
本实施例中， 所述保护机构 140固定于所述铁芯 120的内侧， 在所述铁芯 120的内侧 壁上设置定位槽 122 , 用于轴向定位所述保护机构 140。 为不影响所述磁悬浮轴承 100磁 路和漏磁， 所述定位槽 122应尽可能小， 但要满足相关承载力及所述保护机构 140结构强 度的要求。
请参阅图 3所示， 其为本发明的磁悬浮轴承的第二实施例的剖视示意图， 所述保护机 构 140固定于所述铁芯 120的外侧。 请参阅图 4所示， 其为本发明的磁悬浮轴承的第三实 施例的剖视示意图， 所述保护机构 140固定于所述铁芯 120的绕组槽内。
所述保护机构 140固定于所述铁芯 120的内侧、 外侧或所述铁芯 120的绕组槽内， 当 所述止推盘 1 30与所述铁芯 120之间的距离 L ^时， 所述止推盘 1 30接触到所述保护机构 140。
所述保护机构 140在所述磁悬浮轴承 100的轴向负载失控的情况下， 高速旋转的所述 止推盘 1 30与所述保护机构 140接触， 不会接触到所述铁芯 120 , 避免两者发生碰撞， 起 到保护所述止推盘 1 30与所述铁芯 120的作用， 保证所述止推盘 1 30与所述铁芯 120的机 械结构完好， 延长了使用寿命。
较优地， 所述保护机构 140的支撑体具有较高硬度， 能承受较大的轴向力， 所述保护 机构 140的外覆层可具有一定的弹性， 起到緩冲碰撞的目的。
请参阅图 5所示， 其为本发明的磁悬浮轴承的第四实施例的剖视示意图， 所述磁悬浮 轴承 100还包括基座 160 , 所述铁芯 120置于所述止推盘 1 30与所述基座 160之间。
所述保护机构 140固定在所述基座 160上， 较优地， 所述保护机构 140置于所述基座 160的中间位置。 当所述止推盘 1 30与所述铁芯 120之间的距离 LBin时， 所述转轴 110的端 部接触到所述保护机构 140。
由于所述转轴 110较所述止推盘 1 30的直径小， 所以所述转轴 110的线速度较小， 所 述转轴 110的端部接触到所述保护机构 140时， 对所述保护机构 140摩擦力相对较小， 所 述保护机构 140越靠近所述基座 160的中心， 摩擦力就越小。
一种离心式压缩机， 包括所述磁悬浮轴承 100 , 在实际使用中， 能有效地保护所述磁 悬浮轴承 100 , 使用寿命较长， 在断电后能够迅速分离。
以上所述实施例仅表达了本发明的几种实施方式， 其描述较为具体和详细， 但并不能 因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若千变形和改进， 这些都属于本发明的保护范 围。

Claims

权利要求
1、 一种磁悬浮轴承， 包括转轴和电磁装置， 所述电磁装置分布在所述转轴的外周， 与所述转轴之间具有间隙， 用于调节所述转轴的位置； 所述电磁装置包括具有绕组槽的铁 芯和线圏， 所述线圏置于所述绕组槽内， 其特征在于， 还包括保护机构， 用于防止所述转 轴碰撞所述电磁装置。
2、 根据权利要求 1所述的磁悬浮轴承， 其特征在于， 还包括止推盘；
所述止推盘固定于所述转轴上；
所述保护机构固定在所述电磁装置上， 所述保护机构置于所述止推盘的外周。
3、 根据权利要求 1 所述的磁悬浮轴承， 其特征在于， 所述保护机构将所述止推盘与 所述电磁装置之间的间隙维持在 L , 其中 L〉 0。
4、 根据权利要求 1 所述的磁悬浮轴承， 其特征在于， 所述保护机构包括支撑体和外 覆层；
所述外覆层固定在所述支撑体的外表面上， 所述外覆层由耐磨的不导磁材料制成。
5、 根据权利要求 1 所述的磁悬浮轴承， 其特征在于， 所述保护机构固定于所述铁芯 的内侧、 外侧或所述绕组槽内。
6、 根据权利要求 5 所述的磁悬浮轴承， 其特征在于， 所述保护机构固定在所述铁芯 的内侧， 在所述铁芯的内侧壁上设置有定位槽， 用于轴向定位所述保护机构。
7、 根据权利要求 1 所述的磁悬浮轴承， 其特征在于， 还包括基座， 所述基座用于容 纳所述转轴与所述电磁装置；
所述保护机构固定到所述基座上。
8、 根据权利要求 7 所述的磁悬浮轴承， 其特征在于， 所述保护机构置于所述基座的 中间位置。
9、 根据权利要求 1至 8任一项所述的磁悬浮轴承， 其特征在于， 所述保护机构通过 热套、 粘胶或组装方式固定。
10、一种离心式压缩机，其特征在于，包括权利要求 1至 9任一项所述的磁悬浮轴承。
PCT/CN2014/085827 2013-09-13 2014-09-03 磁悬浮轴承及离心式压缩机 WO2015035871A1 (zh)

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