WO2022032798A1 - 一种箔片动压气体轴承 - Google Patents

一种箔片动压气体轴承 Download PDF

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Publication number
WO2022032798A1
WO2022032798A1 PCT/CN2020/115729 CN2020115729W WO2022032798A1 WO 2022032798 A1 WO2022032798 A1 WO 2022032798A1 CN 2020115729 W CN2020115729 W CN 2020115729W WO 2022032798 A1 WO2022032798 A1 WO 2022032798A1
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WIPO (PCT)
Prior art keywords
foil
corrugated
dynamic pressure
pressure gas
gas bearing
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PCT/CN2020/115729
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English (en)
French (fr)
Inventor
华青松
邱瑞林
仙存妮
刘亚波
魏建新
江涛
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北京稳力科技有限公司
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Publication of WO2022032798A1 publication Critical patent/WO2022032798A1/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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
    • F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic 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
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0662—Details of hydrostatic bearings independent of fluid supply or direction of load
    • F16C32/067—Details of hydrostatic bearings independent of fluid supply or direction of load of bearings adjustable for aligning, positioning, wear or play

Definitions

  • the present invention relates to the technical field of motors, in particular to a disc motor and a stator.
  • Foil dynamic pressure gas bearing is a fluid film lubricated bearing that uses gas as the lubricating medium. In addition to the characteristics of general rigid surface dynamic pressure gas radial bearings, it also has high bearing capacity, low friction power consumption, high stability and Wide operating temperature range, allowable bearing clearance loss, impact resistance, low assembly alignment requirements, good start-stop performance, etc. Since the surface of the bearing is flexible, the foil hydrodynamic gas bearing can establish its working air gap thickness at any time to accept the angular deviation caused by the non-parallel axis of the rotor and the bearing and allow a certain degree of local gap variation.
  • the foil dynamic pressure gas bearing uses the compression effect of the wedge-shaped gas film between the top foil and the thrust plate to generate the axial bearing capacity. Reducing the thickness of the wedge-shaped gas film can enhance the bearing capacity of the corrugated foil dynamic pressure gas bearing.
  • the present invention provides a foil dynamic pressure gas bearing to enhance the bearing capacity of the foil dynamic pressure gas bearing.
  • the present invention provides the following technical solutions:
  • a foil dynamic pressure gas bearing comprising:
  • the bearing seat is provided with a first installation hole matched with the rotor
  • the bottom foil is a circular bottom foil and is installed in the bearing seat, and the bottom foil is provided with a second installation hole corresponding to the position of the first installation hole;
  • the corrugated foil is a fan-shaped corrugated foil and is located on the upper surface of the bottom foil.
  • the number of the corrugated foil is at least three and is evenly distributed along the circumference of the second installation hole.
  • the corrugated foil The first end where one radius of the corrugated foil is located is the first fixed end, the second end where the other radius of the corrugated foil is located is the first free end, and the first fixed end is connected with the bottom foil;
  • the top foil is a fan-shaped flat foil, the top foil corresponds to the position of the corrugated foil and is located on the upper layer of the corrugated foil, and the top foil is evenly distributed along the circumference of the second installation hole,
  • the first end where one radius of the top foil is located is the second fixed end, the second end where the other radius of the top foil is located is the second free end, and the second fixed end and the bottom foil connection;
  • the adjustment foil which is a fan-shaped flat foil, is used to adjust the thickness of the inlet air film between the top foil and the thrust plate, the adjustment foil is at least equal to the size of the corrugated foil, and the adjustment foil is equal to the size of the corrugated foil.
  • the position of the corrugated foil is corresponding to and between the corrugated foil and the bottom foil, the adjustment foil is evenly distributed along the circumference of the second installation hole, and one of the radii of the adjustment foil is located
  • the first end of the adjustment foil is the third fixed end, the second end where the other radius of the adjustment foil is located is the third fixed end, and the third fixed end is connected with the bottom foil.
  • the top foil comprises:
  • the inclined plate is a rectangular inclined plate or a fan-shaped inclined plate, the inclined plate is inclined from the bottom foil to the direction away from the bottom foil, and the first end of the inclined plate is connected to the first end of the top foil body. Two fixed end connections;
  • the first fixing plate is a rectangular fixing plate, the first fixing plate is connected with the second end of the inclined plate, the first fixing plate is connected with the bottom foil, and the first fixing plate is connected with the second end of the inclined plate.
  • the bottom foil is attached as described above.
  • the first connection positions of the first fixed end and the third fixed end and the bottom foil are relative to the second fixed end and the top foil.
  • the second connection positions of the sheets are arranged in a staggered manner, and the first connection positions are located below the inclined plate.
  • a support cantilever is provided on the bottom foil, which is located between the first connection position and the second connection position,
  • the fourth fixed end of the support cantilever is close to the first connection position, and the fourth free end of the support cantilever can abut against the inclined plate.
  • the bottom foil is provided with a groove for accommodating the supporting cantilever.
  • the number of the supporting cantilevers is at least two, and they are arranged along the radial direction of the bottom foil.
  • the first fixing plate and the bottom foil are connected by first rivets.
  • the adjustment foil can be attached to the bottom foil
  • the corrugated foil includes a corrugated foil body and a second fixing plate
  • the second fixing plate is connected with the first fixing end of the corrugated foil body, the second fixing plate is connected with the bottom foil, and can be attached to the adjustment foil.
  • the second fixing plate and the bottom foil are connected by a second rivet, and the second rivet can abut against the inclined plate;
  • the corrugated foil body is provided with a thin groove.
  • a plurality of positioning grooves are opened on the outer circumference of the bottom foil;
  • the bearing seat is provided with a positioning boss matched with the positioning groove.
  • the foil dynamic pressure gas bearing provided by the present invention includes a bearing seat, a bottom foil, a corrugated foil, a top foil and an adjustment foil.
  • an adjustment foil is added between the corrugated foil and the bottom foil to adjust the thickness of the inlet air film between the top foil and the thrust plate.
  • the thickness of the inlet gas film is reduced. The smaller the thickness of the inlet gas film, the greater the compression of the incoming gas, and the stronger the bearing capacity of the foil dynamic pressure gas bearing. .
  • FIG. 1 is a schematic structural diagram of a bearing seat of a foil dynamic pressure gas bearing provided by an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a foil dynamic pressure gas bearing (excluding a bearing seat) provided by an embodiment of the present invention
  • FIG 3 is a partial enlarged view of the foil dynamic pressure gas bearing (excluding the bearing seat) provided by an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a bottom foil provided by an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a top foil provided by an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a corrugated foil provided by an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of an adjustment foil provided by an embodiment of the present invention.
  • Bearing seat 11. Positioning boss, 2. Bottom foil, 21. Supporting cantilever, 3. Corrugated foil, 31. Corrugated foil body, 32, Second fixing plate, 4. Top foil, 41, Top foil body, 42, inclined plate, 43, first fixing plate, 5, adjusting foil.
  • the invention discloses a foil dynamic pressure gas bearing to enhance the bearing capacity of the foil dynamic pressure gas bearing.
  • the invention discloses a foil dynamic pressure gas bearing, which comprises a bearing seat 1 , a bottom foil 2 , a corrugated foil 3 , a top foil 4 and an adjustment foil 5 .
  • the bottom foil 2, the corrugated foil 3, the top foil 4 and the adjustment foil 5 are installed in the bearing seat 1.
  • the top foil 4, the corrugated foil 3, the adjustment paddle and the bottom foil 2 are along the axis of the bearing seat 1 The directions are sequentially overlapped from the open end of the bearing seat 1 to the bottom end of the bearing seat 1 .
  • the bearing seat 1 is provided with a first mounting hole matched with the rotor.
  • the bottom foil 2 is a circumferentially continuous circular bottom foil.
  • the bottom foil 2 is provided with a second mounting hole corresponding to and communicating with the first mounting hole, and the second mounting hole is also matched with the rotor.
  • the corrugated foil 3 is a fan-shaped corrugated foil, that is, the fan-shaped foil is provided with a corrugated structure.
  • the number of the corrugated foil 3 is at least three and is located on the upper surface of the bottom foil 2.
  • the corrugated foil 3 is along the second mounting hole. Evenly distributed around the circumference.
  • the sides of the fan-shaped corrugated foil 3 include two radii and two arc-shaped sides, wherein the first end of one of the radii of the corrugated foil 3 is the first fixed end, and the other radius of the corrugated foil 3 is located.
  • the second end is the first free end, the first fixed end is connected with the bottom foil 2, and the first free end can move along the circumferential direction of the bottom foil 2 under the action of aerodynamic force, balancing its aerodynamic force. Circumferential deformation.
  • the corrugation of the corrugated foil 3 is parallel to the first fixed end of the corrugated foil 3 .
  • the number of layers of the corrugated foil 3 of the foil dynamic pressure gas bearing is not limited to one layer.
  • the number of layers of the corrugated foil 3 of the foil dynamic pressure gas bearing can be one layer, or can be multi-layer, multi-layer corrugated foil
  • the foils 3 are superimposed on each other to adjust the stiffness of the foil dynamic pressure gas bearing.
  • the friction between the adjacent wave foils 3 can increase the damping of the foil dynamic pressure gas bearing and ensure the operation of the foil dynamic pressure gas bearing. stability.
  • the number of corrugated foils 3 is 3-12.
  • the corrugated foil 3 is in groups of 3-12.
  • the top foil 4 is a fan-shaped flat foil, the top foil 4 does not have a corrugated structure, and is a foil structure with equal thickness and height everywhere.
  • the top foil 4 corresponds to the position of the corrugated foil 3, and is located on the upper layer of the corrugated foil 3, and can form an inlet air film with the thrust disc.
  • the number of the top foils 4 is multiple and evenly distributed along the circumference of the second mounting hole.
  • the first end where one radius of the top foil 4 is located is the second fixed end
  • the second end where the other radius of the top foil 4 is located is the second free end
  • the second fixed end is connected to the bottom foil 2
  • the first The two free ends can move circumferentially with the first free end of the bottom foil 2 under the action of aerodynamic force to balance the circumferential deformation caused by the aerodynamic force.
  • the number of layers of the adjustment foil 5 of the foil dynamic pressure gas bearing is not limited to one layer. Specifically, the number of layers of the adjustment foil 5 of the foil dynamic pressure gas bearing can be one layer, or can be multi-layer, multi-layer adjustment The foils 5 are superimposed on each other to adjust the thickness of the inlet gas film of the foil dynamic pressure gas bearing and enhance the bearing capacity of the foil dynamic pressure gas bearing.
  • the number of the top foil 4 is 3-12.
  • the top foil 4 is in groups of 3-12.
  • the adjustment foil 5 is used to adjust the thickness of the inlet air film between the top foil 4 and the thrust plate.
  • the adjustment foil 5 is a fan-shaped flat foil, and the adjustment foil 5 corresponds to the corrugated foil 3 and is located between the corrugated foil 3 and the bottom foil 2 .
  • the number of adjustment foils 5 is multiple, the adjustment foils 5 are evenly distributed along the circumference of the second installation hole, the first end where one radius of the adjustment foils 5 is located is the third fixed end, and the other The second end where a radius is located is the third fixed end, the third fixed end is connected with the bottom foil 2, and the third free end is not fixed.
  • this solution is provided with a weight-reducing groove (not shown in the figure) or a weight-reducing hole (not shown in the figure) on the adjustment foil 5 , on the basis of ensuring the adjustment ability of the adjustment foil 5 , reducing the overall weight of the foil dynamic pressure gas bearing.
  • the number of the adjustment foils 5 is 3-12.
  • the foil dynamic pressure gas bearing disclosed in this solution includes a bearing seat 1 , a bottom foil 2 , a corrugated foil 3 , a top foil 4 and an adjustment foil 5 .
  • an adjusting foil 5 is added between the corrugated foil 3 and the bottom foil 2 to adjust the thickness of the inlet air film between the top foil 4 and the thrust plate.
  • the thickness of the inlet gas film is reduced. The smaller the thickness of the inlet gas film, the greater the compression of the incoming gas, and the bearing capacity of the foil dynamic pressure gas bearing the stronger.
  • the thickness of the adjustment foil 5 and the number of layers of the adjustment foil 5 can be changed.
  • the adjustment range of the thickness of the inlet air film is large and the adjustment is convenient.
  • the size of the adjustment foil 5 is at least equal to the size of the corrugated foil 3, so as to ensure that the adjustment foil 5 can support the corrugated foil 3 and the top foil 4, and the corrugated foil 3 and the top foil
  • the height of the sheet 4 relative to the open end of the bearing is raised as a whole. Under the condition of constant air intake, the gap between the foil dynamic pressure gas bearing and the thrust plate becomes smaller, and the compression amount of the gas increases, and the foil dynamic pressure gas The bearing capacity is improved.
  • the top foil 4 includes a top foil body 41 , an inclined plate 42 and a first fixing plate 43 .
  • the top foil body 41 is a flat foil, which is a foil structure with equal thickness and height everywhere;
  • the inclined plate 42 is a rectangular inclined plate or a fan-shaped inclined plate, which is used to connect the top foil body 41 and the first fixing plate 43, and the inclined plate 42 is inclined from the bottom foil to the direction away from the bottom foil;
  • the distance between the top foil 4 and the bottom foil 2 is greater than the distance between the first fixing plate 43 and the bottom foil 2 .
  • the first fixing plate 43 of the top foil 4 is connected to the bottom foil 2 , and the first fixing plate 43 is attached to the bottom foil 2 .
  • the first fixing plate 43 is in contact with the corrugation of the corrugated foil 3 .
  • the corrugated foil 3 is provided with corrugations, the thickness of the corrugated foil 3 in the direction perpendicular to the bottom foil 2 will be relatively large, the top foil 4 is a flat foil, and one end of the inclined plate 42 is connected to the The corrugations are offset, the other end of the inclined plate 42 is connected to the first fixing plate 43 , and the height of one end of the inclined plate 42 close to the corrugated foil 3 is at least equal to the height of the corrugations on the corrugated foil 3 .
  • first fixing plate 43 and the bottom foil 2 There are various ways to connect the first fixing plate 43 and the bottom foil 2 . Specifically, the first fixing plate 43 and the bottom foil 2 are riveted, welded or bonded together.
  • the thickness of the top foil 4 is 0.1-0.2 mm, that is, the thickness of the top foil 4 is relatively thin, so as to ensure that the top foil 4 maintains a good deformability.
  • the first fixing plate 43 is connected with the bottom foil 2 by riveting, a plurality of rivets are arranged on the first fixing plate 43 , and riveting corresponding to the rivets on the first fixing plate 43 is arranged in the radial direction of the bottom foil 2 hole.
  • a wear-resistant coating is provided on the side of the top foil 4 in contact with the thrust disc.
  • the wear-resistant coating can also realize the self-lubricating effect of the rotor and the foil dynamic pressure gas bearing when starting and stopping, reduce the coefficients of static friction and dynamic friction, and improve the efficiency of the foil dynamic pressure gas bearing.
  • the first connection position between the first fixed end and the third fixed end and the bottom foil 2 is staggered relative to the second connection position between the second fixed end and the bottom foil 2, and the first connection position is located on the inclined plate 42 below.
  • the staggered arrangement of the first connection position and the second connection position can provide sufficient riveting space for the corrugated foil 3 and the adjustment foil 5 , and simultaneously realize the abutment of the second rivet and the inclined plate 42 .
  • a support cantilever 21 is provided on the bottom foil 2 , and the support cantilever 21 is located between the first connection position and the second connection position for supporting the inclined plate 42 .
  • the fourth fixed end of the supporting cantilever 21 is close to the first connection position, and the fourth free end of the supporting cantilever 21 can abut against the inclined plate 42 .
  • the supporting cantilever 21 is located in the air inlet area of the foil dynamic pressure gas bearing, which can support the swash plate 42, improve the deformation resistance of the top foil 4 under the aerodynamic effect, and keep the wedge shape size of the air inlet area basically maintained. Unchanged, to ensure that the gas enters the gas volume between the foil dynamic pressure gas bearing and the thrust plate, increase the gas compression, and further improve the bearing capacity of the foil dynamic pressure gas bearing.
  • the supporting cantilever 21 can be used as a separate part, directly welded between the first connection position and the second connection position, so as to support the inclined plate 42;
  • the supporting cantilever 21 is directly fabricated on the bottom foil 2 , that is, the bottom foil 2 is cut, and the cut supporting cantilever 21 is bent to make the fourth supporting cantilever 21 .
  • the free end abuts against the inclined plate 42 .
  • the bottom foil 2 has a groove for accommodating the supporting cantilever 21 .
  • the number of the supporting cantilevers 21 is at least equal to the number of the top foils 4 , that is, a supporting cantilever 21 needs to be provided between each of the first connection position and the second connection position.
  • the number of the supporting cantilevers 21 between each of the first connection position and the second connection position is at least two. Assuming that the number of top foils 4 is N, the number of supporting cantilevers 21 between each first connection position and the second connection position is MM ⁇ 2, and N and M are positive integers, the number of supporting cantilevers 21 is M*N.
  • the adjustment foil 5 is a flat foil, which can be attached to the bottom foil 2 to effectively support the corrugated foil 3 and the top foil 4 .
  • the corrugated foil 3 includes a corrugated foil body 31 and a second fixing plate 32 .
  • the second fixing plate 32 is connected to the first fixing end of the corrugated foil body 31 , and the second fixing plate 32 is connected to the bottom foil 2 and can be attached to the adjustment foil 5 .
  • both the corrugated foil 3 and the adjustment foil 5 are provided with rivet holes, and the rivet holes of the corrugated foil 3 correspond to the positions of the rivet holes of the adjustment foil 5 .
  • the first fixing plate 43 is connected to the bottom foil 2 by riveting, welding or bonding.
  • the second fixing plate 32 is connected with the bottom foil 2 by riveting, a plurality of rivets are arranged on the second fixing plate 32 , and riveting corresponding to the rivets on the second fixing plate 32 is arranged in the radial direction of the bottom foil 2 hole.
  • the top foil, the corrugated foil and the adjustment foil are connected with the bottom foil by rivets, so that the manufacturing process of the foil dynamic pressure gas bearing is simple, and it can be mass-produced and applied at low cost.
  • the top foil, corrugated foil and adjustment foil are connected with the bottom foil by rivets. As shown in Figure 4, two rows of rivet holes are provided on the bottom foil, and the rivet holes used for connecting with the top foil are along the bottom foil. The radial arrangement of the sheet, the rivet holes for connection with the wave foil and the adjustment foil are parallel to the rivet holes for the connection with the top foil.
  • the second rivet can abut against the inclined plate 42 .
  • the second rivet can also support the inclined plate 42 to further improve the ability of the top foil 4 to resist deformation under the action of aerodynamic force.
  • the thickness of the top foil 4 is 0.1-0.2 mm, that is, the thickness of the top foil 4 is relatively thin, so as to ensure that the top foil 4 maintains a good deformability, but the inclined plate 42 of the top foil 4 is in the Under the supporting action of the supporting cantilever and the second rivet, the deformation basically does not occur, that is, the air inlet is not deformed, and the deformation capacity of other positions remains unchanged.
  • the corrugated foil body 31 is provided with a thin groove.
  • the slot is not limited to the elongated structure, but can also be a circular or other shaped hole.
  • the protruding corrugations on the corrugated foil 3 will be deformed under the action of gas pressure, and gradually approach a plane, and the fine grooves can deform to absorb part of the protruding corrugations.
  • the corrugated foil 3 is pressed into a flat surface, causing the foil dynamic pressure gas bearing to fail.
  • the thin groove can also reduce the cost of the corrugated foil 3 , reduce the weight of the corrugated foil 3 , reduce the bearing force of the riveting position, and prolong the service life of the corrugated foil 3 .
  • the outer periphery of the bottom foil 2 is provided with a plurality of positioning grooves
  • the bearing seat 1 is provided with positioning bosses 11 that cooperate with the positioning grooves.
  • the positioning grooves cooperate with the positioning bosses 11 to realize the bottom foil 2 in the Circumferential fixation within the bearing housing 1 .

Abstract

一种箔片动压气体轴承，包括轴承座（1）、底箔片（2）、波箔片（3）、顶箔片（4）和调整箔片（5）。在波箔片（3）与底箔片（2）之间增加了调整箔片（5），用于调节顶箔片（4）与推力盘之间的进口气膜厚度。通过在波箔片（3）的下方增设调整箔片（5），以减小进口气膜的厚度，进口气膜的厚度越小，对进入的气体的压缩量越大，箔片动压气体轴承的承载力越强。

Description

一种箔片动压气体轴承
本申请要求于2020年08月14日提交中国专利局、申请号为202010818095.3、发明名称为“一种箔片动压气体轴承”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及电机技术领域，特别涉及一种盘式电机及定子。
背景技术
箔片动压气体轴承是一种采用气体作为润滑介质的流体膜润滑轴承，除了具有一般刚性表面动压气体径向轴承的特点外，还具有高承载力、低摩擦功耗、高稳定性和工作温度范围宽、容许轴承间隙损失、耐冲击、装配对中要求低、起停性能好等优点。由于轴承的表面是柔性的，箔片动压气体轴承能够随时建立它的工作气膜间隙厚度，以接收转子与轴承轴线不平行而产生的角偏差并容许一定程度的局部间隙变化。
箔片动压气体轴承是利用顶层箔片和止推盘之间楔形气膜的压缩效应来产生轴向承载力，缩小楔形气膜的厚度能够增强波箔片动压气体轴承的承载力。
因此，如何增强箔片动压气体轴承的承载力，成为本领域技术人员亟待解决的技术问题。
发明内容
有鉴于此，本发明提供了一种箔片动压气体轴承，以增强箔片动压气体轴承的承载力。
为实现上述目的，本发明提供如下技术方案：
一种箔片动压气体轴承，包括：
轴承座，所述轴承座上开设有与转子配合的第一安装孔；
底箔片，为圆形底箔片且安装在所述轴承座内，所述底箔片上开设有与所述第一安装孔位置对应的第二安装孔；
波箔片，为扇形波纹箔片且位于所述底箔片的上表面，所述波箔片的个数至少为三个且沿所述第二安装孔的圆周均匀分布，所述波箔片的其中一条半径所在的第一端为第一固定端，所述波箔片的另一条半径所在的第二端为第一自由端，所述第一固定端与所述底箔片连接；
顶箔片，为扇形平箔片，所述顶箔片与所述波箔片位置对应且位于所述波箔片的上层，所述顶箔片沿所述第二安装孔的圆周均匀分布，所述顶箔片的其中一条半径所在的第一端为第二固定端，所述顶箔片的另一条半径所在的第二端为第二自由端，所述第二固定端与所述底箔片连接；
调整箔片，为扇形平箔片，用于调节所述顶箔片与推力盘之间的进口气膜厚度，所述调整箔片至少等于所述波箔片的尺寸，所述调整箔片与所述波箔片位置对应且位于所述波箔片与所述底箔片之间，所述调整箔片沿所述第二安装孔的圆周均匀分布，所述调整箔片的其中一条半径所在的第一端为第三固定端，所述调整箔片的另一条半径所在的第二端为第三固定端，所述第三固定端与所述底箔片连接。
优选的，在上述箔片动压气体轴承中，所述顶箔片包括：
顶箔片本体；
斜板，为矩形斜板或者扇形斜板，所述斜板自所述底箔片向远离所述底箔片的方向倾斜，所述斜板的第一端与所述顶箔片本体的第二固定端连接；
第一固定板，为矩形固定板，所述第一固定板与所述斜板的第二端连接，且所述第一固定板与所述底箔片连接，所述第一固定板与所述底箔片贴合。
优选的，在上述箔片动压气体轴承中，所述第一固定端和所述第三固定端与所述底箔片的第一连接位置相对于所述第二固定端与所述顶箔片的第二连接位置错位布置，且所述第一连接位置位于所述斜板的下方。
优选的，在上述箔片动压气体轴承中，所述底箔片上设置有支撑悬臂，位于所述第一连接位置与所述第二连接位置之间，
所述支撑悬臂的第四固定端靠近所述第一连接位置，所述支撑悬臂的第四自由端能够与所述斜板相抵。
优选的，在上述箔片动压气体轴承中，所述底箔片上开设有用于容纳所述支撑悬臂的凹槽。
优选的，在上述箔片动压气体轴承中，所述支撑悬臂的个数至少为两个，且沿着所述底箔片的径向方向设置。
优选的，在上述箔片动压气体轴承中，所述第一固定板与所述底箔片通过第一铆钉连接。
优选的，在上述箔片动压气体轴承中，所述调整箔片能够与所述底箔片贴合；
所述波箔片包括波箔片本体和第二固定板，
所述第二固定板与所述波箔片本体的第一固定端连接，所述第二固定板与 所述底箔片连接，且能够与所述调整箔片贴合。
优选的，在上述箔片动压气体轴承中，所述第二固定板与所述底箔片通过第二铆钉连接，所述第二铆钉能够与所述斜板相抵；
所述波箔片本体上开设细槽。
优选的，在上述箔片动压气体轴承中，所述底箔片的外周上开设有多个定位槽；
所述轴承座上开设有与所述定位槽配合的定位凸台。
从上述技术方案可以看出，本发明提供的箔片动压气体轴承，包括轴承座、底箔片、波箔片、顶箔片和调整箔片。本方案在波箔片与底箔片之间增加了调整箔片，用于调节顶箔片与推力盘之间的进口气膜厚度。通过在波箔片的下方增设调整箔片，以减小进口气膜的厚度，进口气膜的厚度越小，对进入的气体的压缩量越大，箔片动压气体轴承的承载力越强。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的箔片动压气体轴承的轴承座的结构示意图；
图2为本发明实施例提供的箔片动压气体轴承(不包含轴承座)的结构示意图；
图3为本发明实施例提供的箔片动压气体轴承(不包含轴承座)的局部放大图；
图4为本发明实施例提供的底箔片的结构示意图；
图5为本发明实施例提供的顶箔片的结构示意图；
图6为本发明实施例提供的波箔片的结构示意图；
图7为本发明实施例提供的调整箔片的结构示意图。
其中，
1、轴承座，11、定位凸台，2、底箔片，21、支撑悬臂，3、波箔片，31、波箔片本体，32、第二固定板，4、顶箔片，41、顶箔片本体，42、斜板，43、第一固定板，5、调整箔片。
具体实施方式
本发明公开了一种箔片动压气体轴承，以增强箔片动压气体轴承的承载力。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参阅图1-图7。本发明公开了一种箔片动压气体轴承，包括轴承座1、底箔片2、波箔片3、顶箔片4和调整箔片5。
轴承座1内安装有底箔片2、波箔片3、顶箔片4和调整箔片5，顶箔片4、 波箔片3、调整拨片和底箔片2沿轴承座1的轴线方向自轴承座1的开口端向轴承座1的底端依次重叠设置。轴承座1上开设有与转子配合的第一安装孔。
底箔片2为周向连续的圆形底箔片，底箔片2上开设有与第一安装孔位置对应且连通的第二安装孔，第二安装孔也与转子配合。
波箔片3为扇形波纹箔片即扇形箔片上设置有波纹状结构，波箔片3的个数至少为三个且位于底箔片2的上表面，波箔片3沿第二安装孔的圆周均匀分布。扇形波箔片3的边包括两条半径所在的边和两条弧形边，其中波箔片3的其中一条半径所在的第一端为第一固定端，波箔片3的另一条半径所在的第二端为第一自由端，第一固定端与底箔片2连接，第一自由端能够在气动力的作用下沿着底箔片2的周向运动，平衡其因气动力造成的周向变形。
如图6所示，波箔片3的波纹与波箔片3的第一固定端平行。
箔片动压气体轴承的波箔片3的层数不限于一层，具体的，箔片动压气体轴承的波箔片3的层数可以为一层，也可以为多层，多层波箔片3相互叠加，以调节箔片动压气体轴承的刚度，同时相邻波箔片3之间的摩擦作用能够增大箔片动压气体轴承的阻尼，保证箔片动压气体轴承运行的平稳性。
在波箔片的层数为一层的实施例中，波箔片3的个数为3-12个。
在波箔片的层数为不只一层的实施例中，波箔片3为3-12组。
顶箔片4为扇形平箔片，顶箔片4上不具有波纹状结构，为各处厚度且高度相等的箔片结构。顶箔片4与波箔片3的位置对应，且位于波箔片3的上层，能够与推力盘之间形成进口气膜。顶箔片4的个数为多个且沿着第二安装孔的圆周均匀分布。顶箔片4的其中一条半径所在的第一端为第二固定端，顶箔片4的另一条半径所在的第二端为第二自由端，第二固定端与底箔片2连接，第 二自由端能够在气动力的作用下随底箔片2的第一自由端作周向运动，平衡其因气动力造成的周向变形。
箔片动压气体轴承的调整箔片5的层数不限于一层，具体的，箔片动压气体轴承的调整箔片5的层数可以为一层，也可以为多层，多层调整箔片5相互叠加，以调节箔片动压气体轴承的进口气膜厚度，增强箔片动压气体轴承的承载力。
在调整箔片的层数为一层的实施例中，顶箔片4的个数为3-12个。
在调整箔片的层数不只为一层的实施例中，顶箔片4为3-12组。
调整箔片5用于调节顶箔片4与推力盘之间的进口气膜厚度。调整箔片5为扇形平箔片，调整箔片5与波箔片3位置对应且位于波箔片3与底箔片2之间。调整箔片5的个数为多个，调整箔片5沿第二安装孔的圆周均匀分布，调整箔片5的其中一条半径所在的第一端为第三固定端，调整箔片5的另一条半径所在的第二端为第三固定端，第三固定端与底箔片2连接，第三自由端不进行固定。
为了进一步优化上述技术方案，本方案在调整箔片5上开设有减重槽(图中未示出)或者减重孔(图中未示出)，在保证调整箔片5的调整能力的基础上，减轻箔片动压气体轴承的整体重量。
在本方案的一个具体实施例中，调整箔片5的个数为3-12个。
具体安装时，首先将波箔片3和调整箔片5与底箔片2连接，然后将顶箔片4与底箔片2连接。
本方案公开的箔片动压气体轴承，包括轴承座1、底箔片2、波箔片3、顶箔片4和调整箔片5。本方案在波箔片3与底箔片2之间增加了调整箔片5， 用于调节顶箔片4与推力盘之间的进口气膜厚度。通过在波箔片3的下方增设调整箔片5，以减小进口气膜的厚度，进口气膜的厚度越小，对进入的气体的压缩量越大，箔片动压气体轴承的承载力越强。
在对进口气膜厚度进行调整时，可以改变调整箔片5的厚度，也可以改变调整箔片5的层数，进口气膜厚度的调整范围大，且调节方便。
如图2所示，调整箔片5的尺寸至少等于波箔片3的尺寸，保证调整箔片5能够对波箔片3和顶箔片4起到支撑作用，将波箔片3和顶箔片4相对于轴承的开口端的高度整体抬高，在进气量不变的情况下，箔片动压气体轴承与推力盘之间的间隙变小，气体的压缩量变大，箔片动压气体轴承的承载力提高。
如图5所示，顶箔片4包括顶箔片本体41、斜板42和第一固定板43。
顶箔片本体41为平箔片，为各处厚度和高度均相等的箔片结构；
斜板42为矩形斜板或者扇形斜板，用于连接顶箔片本体41和第一固定板43，斜板42自底箔向着远离底箔的方向倾斜；
第一固定板43与斜板42连接后，顶箔片4与底箔片2之间的距离大于第一固定板43与底箔片2之间的距离。
顶箔片4的第一固定板43与底箔片2连接，且第一固定板43与底箔片2贴合。优选的，第一固定板43与波箔片3的波纹相抵。
由于波箔片3上设置有波纹，波箔片3在垂直于底箔片2方向上的厚度会相对较大，顶箔片4为平箔片，斜板42的一端与波箔片3的波纹相抵，斜板42的另一端与第一固定板43连接，斜板42靠近波箔片3的一端的高度至少等于波箔片3上波纹的高度。
第一固定板43与底箔片2的连接方式有多种，具体的，第一固定板43 与底箔片2铆接、焊接或者粘接连接在一体。
优选的，本方案中顶箔片4的厚度为0.1-0.2mm，即顶箔片4的厚度相对较薄，保证顶箔片4保持良好的变形能力。
优选的，第一固定板43与底箔片2铆接连接，第一固定板43上设置有多个铆钉，底箔片2的径向方向上设置有与第一固定板43上铆钉对应的铆接孔。
为了提高顶箔片的耐磨性能，本方案在顶箔片4与推力盘接触的一面设置有耐磨涂层。耐磨涂层还能够实现转子与箔片动压气体轴承启停时的自润滑作用，降低静摩擦和动摩擦的系数，提高箔片动压气体轴承的效率。
本方案中，第一固定端和第三固定端与底箔片2的第一连接位置相对于第二固定端与底箔片2的第二连接位置错位布置，且第一连接位置位于斜板42的下方。第一连接位置与第二连接位置错位布置，能够为波箔片3和调整箔片5提供足够的铆接空间，同时实现第二铆钉与斜板42的相抵。如图2和4所示，本方案在底箔片2上设置有支撑悬臂21，支撑悬臂21位于第一连接位置与第二连接位置之间，用于支撑斜板42。支撑悬臂21的第四固定端靠近第一连接位置，支撑悬臂21的第四自由端能够与斜板42相抵。
支撑悬臂21位于箔片动压气体轴承的进气口区域，能够对斜板42起到支撑作用，提高顶箔片4在气动力作用下抗变形的能力，使进气口区域楔形尺寸基本保持不变，保证气体进入箔片动压气体轴承与推力盘之间的气体量，增大气体的压缩量，进一步提高箔片动压气体轴承的承载力。
在本方案的一个具体实施例中，支撑悬臂21可以作为一个单独的零件，直接焊接在第一连接位置和第二连接位置之间，以实现对斜板42的支撑；
在本方案的另一个具体实施例中，支撑悬臂21直接在底箔片2上进行制 作，即对底箔片2进行切割，对切割出的支撑悬臂21弯折，使支撑悬臂21的第四自由端与斜板42相抵。该实施例中，底箔片2上具有容纳支撑悬臂21的凹槽。
如图4所示，支撑悬臂21的个数至少与顶箔片4的数量相等，即每个第一连接位置与第二连接位置之间均需要设置支撑悬臂21。
如图4所示，每个第一连接位置与第二连接位置之间的支撑悬臂21的个数为至少两个。假设顶箔片4的个数为N，每个第一连接位置与第二连接位置之间的支撑悬臂21的个数为MM≥2，且N和M为正整数，支撑悬臂21的个数为M*N个。
调整箔片5为平箔片，能够与底箔片2贴合，以实现对波箔片3和顶箔片4的有效支撑。
波箔片3包括波箔片本体31和第二固定板32。第二固定板32与波箔片本体31的第一固定端连接，第二固定板32与底箔片2连接且能够与调整箔片5贴合。
如图2所示，波箔片3和调整箔片5上均设置有铆钉孔，且波箔片3的铆钉孔与调整箔片5的铆钉孔的位置对应。
第二固定板32和调整箔片5与底箔片2的连接方式有多种，具体的，第一固定板43与底箔片2铆接、焊接或者粘接连接在一体。
优选的，第二固定板32与底箔片2铆接连接，第二固定板32上设置有多个铆钉，底箔片2的径向方向上设置有与第二固定板32上铆钉对应的铆接孔。
本方案中顶箔片、波箔片和调整箔片与底箔片的连接均采用铆钉连接，使得箔片动压气体轴承的制造工艺简单，可在低成本条件下大规模生产和应用。
顶箔片、波箔片和调整箔片与底箔片采用铆钉连接，如图4所示，底箔片上开设有两排沿铆钉孔，其中用于与顶箔片连接的铆钉孔沿底箔片的径向设置，用于与波箔片和调整箔片连接的铆钉孔与用于与顶箔片连接的铆钉孔平行。
如图3所示，第二铆钉能够与斜板42相抵。第二铆钉也能够对斜板42起到支撑作用，进一步提高顶箔片4在气动力作用下抵抗变形的能力。
优选的，本方案中顶箔片4的厚度为0.1-0.2mm，即顶箔片4的厚度相对较薄，保证顶箔片4保持良好的变形能力，但是顶箔片4的斜板42在支撑悬臂和第二铆钉的支撑作用下基本不发生变形，即进气口不发生变形，其余位置的变形能力不变。
本方案中，波箔片本体31上开设有细槽。
细槽不限于长条形结构，还可以为圆形或者其他形状的孔。
在箔片动压气体轴承工作时，波箔片3上突起的波纹会在气体压力的作用下发生形变，逐渐趋近于一个平面，细槽能够发生变形来吸收一部分突起的波纹的形变，避免在极限情况下波箔片3被压成平面造成箔片动压气体轴承失效。
细槽还能够降低波箔片3的成本，减轻波箔片3的重量，减小铆接位置的承受的力，延长波箔片3的使用寿命。
如图4所示，底箔片2的外周开设有多个定位槽，轴承座1上开设有与定位槽配合的定位凸台11，定位槽与定位凸台11配合，实现底箔片2在轴承座1内的周向固定。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本 发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (10)

  1. 一种箔片动压气体轴承，其特征在于，包括：
    轴承座(1)，所述轴承座(1)上开设有与转子配合的第一安装孔；
    底箔片(2)，为圆形底箔片且安装在所述轴承座(1)内，所述底箔片(2)上开设有与所述第一安装孔位置对应的第二安装孔；
    波箔片(3)，为扇形波纹箔片且位于所述底箔片(2)的上表面，所述波箔片(3)的个数至少为三个且沿所述第二安装孔的圆周均匀分布，所述波箔片(3)的其中一条半径所在的第一端为第一固定端，所述波箔片(3)的另一条半径所在的第二端为第一自由端，所述第一固定端与所述底箔片(2)连接；
    顶箔片(4)，为扇形平箔片，所述顶箔片(4)与所述波箔片(3)位置对应且位于所述波箔片(3)的上层，所述顶箔片(4)沿所述第二安装孔的圆周均匀分布，所述顶箔片(4)的其中一条半径所在的第一端为第二固定端，所述顶箔片(4)的另一条半径所在的第二端为第二自由端，所述第二固定端与所述底箔片(2)连接；
    调整箔片(5)，为扇形平箔片，用于调节所述顶箔片(4)与推力盘之间的进口气膜厚度，所述调整箔片(5)至少等于所述波箔片(3)的尺寸，所述调整箔片(5)与所述波箔片(3)位置对应且位于所述波箔片(3)与所述底箔片(2)之间，所述调整箔片(5)沿所述第二安装孔的圆周均匀分布，所述调整箔片(5)的其中一条半径所在的第一端为第三固定端，所述调整箔片(5)的另一条半径所在的第二端为第三固定端，所述第三固定端与所述底箔片(2)连接。
  2. 根据权利要求1所述的箔片动压气体轴承，其特征在于，所述顶箔片(4)包括：
    顶箔片本体(41)；
    斜板(42)，为矩形斜板或者扇形斜板，所述斜板(42)自所述底箔片(2)向远离所述底箔片(2)的方向倾斜，所述斜板(42)的第一端与所述顶箔片本体(41)的第二固定端连接；
    第一固定板(43)，为矩形固定板，所述第一固定板(43)与所述斜板(42)的第二端连接，且所述第一固定板(43)与所述底箔片(2)连接，所述第一固定板(43)与所述底箔片(2)贴合。
  3. 根据权利要求2所述的箔片动压气体轴承，其特征在于，所述第一固定端和所述第三固定端与所述底箔片(2)的第一连接位置相对于所述第二固定端与所述顶箔片(4)的第二连接位置错位布置，且所述第一连接位置位于所述斜板(42)的下方。
  4. 根据权利要求3所述的箔片动压气体轴承，其特征在于，所述底箔片(2)上设置有支撑悬臂(21)，位于所述第一连接位置与所述第二连接位置之间，
    所述支撑悬臂(21)的第四固定端靠近所述第一连接位置，所述支撑悬臂(21)的第四自由端能够与所述斜板(42)相抵。
  5. 根据权利要求4所述的箔片动压气体轴承，其特征在于，所述底箔片(2)上开设有用于容纳所述支撑悬臂(21)的凹槽。
  6. 根据权利要求4所述的箔片动压气体轴承，其特征在于，所述支撑悬臂(21)的个数至少为两个，且沿着所述底箔片(2)的径向方向设置。
  7. 根据权利要求2所述的箔片动压气体轴承，其特征在于，所述第一固定板(43)与所述底箔片(2)通过第一铆钉连接。
  8. 根据权利要求1所述的箔片动压气体轴承，其特征在于，所述调整箔片(5)能够与所述底箔片(2)贴合；
    所述波箔片(3)包括波箔片本体(31)波箔片本体(31)(31)和第二固定板(32)，
    所述第二固定板(32)与所述波箔片本体(31)波箔片本体(31)(31)的第一固定端连接，所述第二固定板(32)与所述底箔片(2)连接，且能够与所述调整箔片(5)贴合。
  9. 根据权利要求8所述的箔片动压气体轴承，其特征在于，所述第二固定板(32)与所述底箔片(2)通过第二铆钉连接，所述第二铆钉能够与所述斜板(42)相抵；
    所述波箔片本体(31)波箔片本体(31)(31)上开设细槽。
  10. 根据权利要求1所述的箔片动压气体轴承，其特征在于，所述底箔片(2)的外周上开设有多个定位槽；
    所述轴承座(1)上开设有与所述定位槽配合的定位凸台(11)。
PCT/CN2020/115729 2020-08-14 2020-09-17 一种箔片动压气体轴承 WO2022032798A1 (zh)

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