WO2023273065A1 - 一种推力轴承后置式空气悬浮鼓风机 - Google Patents

一种推力轴承后置式空气悬浮鼓风机 Download PDF

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Publication number
WO2023273065A1
WO2023273065A1 PCT/CN2021/127220 CN2021127220W WO2023273065A1 WO 2023273065 A1 WO2023273065 A1 WO 2023273065A1 CN 2021127220 W CN2021127220 W CN 2021127220W WO 2023273065 A1 WO2023273065 A1 WO 2023273065A1
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WIPO (PCT)
Prior art keywords
shaft
motor
rotating shaft
boss
thrust
Prior art date
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PCT/CN2021/127220
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English (en)
French (fr)
Inventor
钟仁志
袁军
项懂欣
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鑫磊压缩机股份有限公司
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Publication of WO2023273065A1 publication Critical patent/WO2023273065A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/053—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/053—Shafts
    • F04D29/054—Arrangements for joining or assembling shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/057—Bearings hydrostatic; hydrodynamic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps

Definitions

  • the invention relates to the field of air suspension blowers, in particular to a thrust bearing rear mounted air suspension blower.
  • Air Suspension Centrifugal Blower is a brand-new concept blower. It adopts three core high-end technologies of ultra-high-speed direct-coupled motor, air suspension bearing and high-precision single-stage centrifugal impeller, creating a high-efficiency, high-performance, low-noise, low-energy consumption fan. new era.
  • Chinese invention patent application discloses an air suspension centrifugal blower, including motor, volute, impeller, impeller shaft, bearing shaft, air suspension radial bearing and air suspension thrust bearing, motor
  • the front and rear ends of the rotor are rotatably connected to the air-suspended radial bearing through the bearing shaft, and the bearing shaft at the front end of the motor is rotatably connected to the air-suspended thrust bearing through the thrust disc.
  • the friction surface of the bearing shaft and the thrust disc is provided with PVD coating.
  • the friction coefficient of PVD coating is less than or equal to 0.1, and the thickness of PVD coating is 2 ⁇ m to 8 ⁇ m; the friction surface of air suspension radial bearing and air suspension thrust bearing is provided with PTFE coating, and the friction coefficient of PTFE coating is less than or equal to 0.05, the thickness of PTFE coating is 0.02mm ⁇ 0.05mm.
  • the invention has the advantages of compact structure, high efficiency, long service life, good stability, high number of starts and stops, low motor temperature rise, and the like.
  • the prior art has the following deficiencies: the thrust disc and the blower impeller in the motor shaft system are arranged on one side of the motor shaft, and the heat dissipation impeller is independently arranged on the other side of the motor shaft; and the blower impeller has a larger mass than the heat dissipation impeller, and the thrust After the disk is set on the side of the blower impeller with a large mass, the mass difference between the two sides of the motor shaft is relatively large; thus, the center of mass of the motor shaft is not at the center of the motor shaft but on the side close to the blower impeller, which in turn causes a blower impeller Compared with the air radial bearing on the heat dissipation impeller side, the air radial bearing on the side of the heat dissipation impeller is subjected to a larger force, which reduces the service life of a single air radial bearing.
  • the purpose of the present invention is: in view of the above problems, it is proposed to set the thrust plate on one side of the heat dissipation impeller, so that the center of mass of the motor shaft system is at the center of the motor shaft; and then ensure that the air radial bearings on both sides are evenly stressed and improve the air radial bearing.
  • a thrust bearing rear-mounted air suspension blower the blower includes a motor shafting, a motor outer cylinder, a motor inner cylinder, a motor stator, a first end cover, a second end cover and an axial air bearing; the first end cover and the second The end covers are respectively fixed on both ends of the motor outer cylinder, the outer wall of the motor inner cylinder is nested into the inner hole of the motor outer cylinder, and the motor stator is fixed on the motor inner cylinder;
  • the motor shaft system includes the motor shaft, the second rotating shaft and the third rotating shaft;
  • the motor shaft A motor rotor is provided, and one end of the second rotating shaft and one end of the third rotating shaft are coaxially fixedly connected to both ends of the motor shaft;
  • the second rotating shaft is fixedly sleeved in sequence from the inner side to the outer side in the axial direction with a second air radial bearing, a thrust plate, The heat dissipation impeller and the second lock nut, the third shaft is fixedly sle
  • the second rotating shaft includes a first shaft section, a second shaft section, a third shaft section and a fourth shaft section; the outer wall of the first shaft section and the outer wall of the fourth shaft section are provided with external threads, and the motor shaft is located at the second One end of the rotating shaft is provided with a second boss; the second boss is provided with an inner hole with an internal thread, and the external thread of the first shaft section and the inner thread of the inner hole of the second boss are screwed to the inner end surface of the second shaft section Fitting position with the outer end surface of the second boss.
  • a second shaft sleeve is sheathed on the outer wall of the second boss; the second rotating shaft passes through the inner hole of the second shaft sleeve, and the outer wall of the second shaft sleeve is rotatably connected with the second air radial bearing; the second shaft The sleeve is provided with a boss of the second shaft sleeve, and the thrust plate and the cooling impeller are sleeved on the outer wall of the boss of the second shaft sleeve; the second lock nut is screwed with the external thread of the fourth shaft section; the second lock nut is locked When tight, the second shaft sleeve is axially locked on the second rotating shaft, and the thrust disc and the cooling impeller are axially locked on the second shaft sleeve.
  • the outer surface of the second shaft sleeve is provided with PVD coating.
  • the third rotating shaft includes a fifth shaft section, a sixth shaft section, a seventh shaft section and an eighth shaft section; the outer wall of the fifth shaft section and the eighth shaft section are provided with external threads, and the motor shaft is located at the third One end of the rotating shaft is provided with a third boss; the third boss is provided with an inner hole with an internal thread, and the external thread of the fifth shaft section is screwed with the inner thread of the inner hole of the third boss to the inner end surface of the sixth shaft section and The position where the outer end surface of the third boss is in contact with each other.
  • a third shaft sleeve is sheathed on the outer wall of the third boss; the third rotating shaft passes through the inner hole of the third shaft sleeve, and the outer wall of the third shaft sleeve is rotatably connected with the third air radial bearing; the third shaft The sleeve is provided with a boss of the third shaft sleeve, and the blower impeller is sleeved on the outer wall of the boss of the third shaft sleeve, and the third lock nut is screwed with the external thread of the eighth shaft section; when the third lock nut is locked, The third shaft sleeve is axially locked on the third rotating shaft, and the blower impeller is axially locked on the third shaft sleeve.
  • the outer surface of the third shaft sleeve is provided with PVD coating.
  • the second shaft sleeve and the third shaft sleeve are axially symmetrically distributed along the centroid of the motor shaft.
  • the second air radial bearing and the third air radial bearing are respectively fixed on the first end cover and the second end cover.
  • the second end cover is provided with a first thrust disk groove and a second thrust disk groove, and the first thrust disk groove and the second thrust disk groove are arranged at opposite ends of the thrust disk;
  • the axial air bearing is provided with a An axial limiting part for the axial position of the thrust disc, the two axial limiting parts are respectively fixed on the groove of the first thrust disc and the groove of the second thrust disc.
  • the second rotating shaft, the thrust disc, the heat dissipation impeller, the second locking nut, the third rotating shaft, the blower impeller and the third locking nut are all rotating parts, and their respective centers of mass are all located at the center of rotation; meanwhile, the motor shaft, the third locking nut
  • the three of the second rotating shaft and the third rotating shaft are coaxially connected, that is, the respective centers of mass of the above rotating body parts are all located on the axis of the motor shaft;
  • the sum of the product of the distance from the center of mass to the center of the motor shaft is equal to the sum of the products of the respective weights of the third rotating shaft, the blower impeller and the third lock nut and the distances from the center of mass to the center of the motor shaft; that is, the pair of parts on the second rotating shaft
  • the influence of the position of the center of mass of the motor shaft and the influence of the parts on the third rotating shaft on the position of the center of mass of the motor shaft are offset, so that the center of mass of the motor shaft remains
  • Fig. 1 is a structural schematic diagram of the present invention.
  • Fig. 2 is a structural schematic diagram of the motor shaft system.
  • a thrust bearing rear-mounted air suspension blower includes a motor shaft system, a motor outer cylinder 12, a motor inner cylinder 13, a motor stator 14, a first end cover 15, and a second end cover 16 and axial air bearing 17; the first end cover 15 and the second end cover 16 are respectively fixed on both ends of the motor outer cylinder 12, the outer wall of the motor inner cylinder 13 is nested into the inner hole of the motor outer cylinder 12, and the motor stator 14 is fixed on the motor On the inner cylinder 13; the motor shaft system includes a motor shaft 1, a second shaft 2 and a third shaft 3; the motor shaft 1 is provided with a motor rotor 11, and one end of the second shaft 2 and one end of the third shaft 3 are fixedly connected to the motor respectively Both ends of the shaft 1; the second rotating shaft 2 is fixedly sleeved with the second air radial bearing 21, the thrust disc 22, the heat dissipation impeller 23 and the second lock nut 24 from the inside to the outside in the axial direction
  • the locking direction of the second locking nut 24 and the third locking nut 33 is opposite to the running direction of the shaft system, and can prevent loosening during high-speed running.
  • the second rotating shaft 2, the thrust disc 22, the cooling impeller 23, the second locking nut 24, the third rotating shaft 3, the blowing impeller 32 and the third locking nut 33 are all parts of a rotating body, and their respective centers of mass are located at the center of rotation.
  • the motor shaft 1, the second rotating shaft 2 and the third rotating shaft 3 are coaxially connected, that is, the respective centroids of the above rotating body parts are all located on the axis of the motor shaft 1; and, the second rotating shaft 2, the thrust disc 22
  • the sum of the product of the respective weights of the cooling impeller 23 and the second lock nut 24 and the distance from the center of mass to the center of the motor shaft 1 is equal to the respective weights of the third rotating shaft 3, the blower impeller 32 and the third lock nut 33 and their center of mass
  • the sum of the products of the distances to the center position of the motor shaft 1; that is, the influence of the parts on the second shaft 2 on the position of the center of mass of the motor shaft and the influence of the parts on the third shaft 3 on the position of the center of mass of the motor shaft are offset, so that the motor shaft
  • the center of mass of the system is kept at the center of the motor shaft 1; furthermore, the second air radial bearing 21 and the third air radial bearing 31 on both sides of the motor
  • the second rotating shaft 2 includes a first shaft section 521, a second shaft section 522, a third shaft section 523 and a fourth shaft section 524; the outer wall of the first shaft section 521 and the outer wall of the fourth shaft section 524 are provided There is an external thread, and the motor shaft 1 is provided with a second boss 54 at one end of the second rotating shaft 2; the second boss 54 is provided with an inner hole with an internal thread, and the external thread of the first shaft section 521 is connected with the second boss. The internal thread of the inner hole of 54 is screwed to the position where the inner end surface of the second shaft section 522 and the outer end surface of the second boss 54 are attached.
  • the outer wall of the second boss 54 is covered with a second shaft sleeve 55; the second rotating shaft 2 passes through the inner hole of the second shaft sleeve 55, and the outer wall of the second shaft sleeve 55 is rotatably connected with the second air radial bearing 21;
  • the second shaft sleeve 55 is provided with a second shaft sleeve boss 551, and the thrust plate 22 and the cooling impeller 23 are sleeved on the outer wall of the second shaft sleeve boss 551;
  • the second locking nut 24 is locked, the second shaft sleeve 55 is axially locked on the second rotating shaft 2 , and the thrust disc 22 and the cooling impeller 23 are axially locked on the second shaft sleeve 55 .
  • the outer surface of the second shaft sleeve 55 is provided with PVD coating.
  • the second axle sleeve 55 has not been supported and suspended by the second air radial bearing 21, and dry friction will be generated between the second axle sleeve 55 outer wall and the second air radial bearing 21;
  • the surface of the two shaft sleeves 55 is relatively smooth and has a PVD coating on the surface, which has a low coefficient of friction and high hardness, and the number of contact frictions can reach more than 40,000 times. When the contact friction reaches the upper limit and is damaged, only the worn second shaft sleeve 55 needs to be replaced without replacing the second rotating shaft 2 , thereby increasing the service life of the second rotating shaft 2 .
  • the third rotating shaft 3 includes a fifth shaft segment 531, a sixth shaft segment 532, a seventh shaft segment 533 and an eighth shaft segment 534; the outer wall of the fifth shaft segment 531 and the outer wall of the eighth shaft segment 534 are provided with external threads, and the motor shaft 1.
  • a third boss 56 is arranged at one end of the third rotating shaft 3; the third boss 56 is provided with an inner hole with an internal thread, and the outer thread of the five-axis section 531 is consistent with the inner thread of the inner hole of the third boss 56. Screw to the position where the inner end surface of the sixth shaft segment 532 is in contact with the outer end surface of the third boss 56 .
  • the outer wall of the third boss 56 is covered with a third shaft sleeve 57; the third rotating shaft 3 passes through the inner hole of the third shaft sleeve 57, and the outer wall of the third shaft sleeve 57 is rotatably connected with the third air radial bearing 31;
  • the third sleeve 57 is provided with a third sleeve boss 571, the blower impeller 32 is sleeved on the outer wall of the third sleeve boss 571, and the third locking nut 33 is screwed with the external thread of the eighth shaft section 534;
  • the third locking nut 33 is locked, the third shaft sleeve 57 is axially locked on the third rotating shaft 3 , and the blower impeller 32 is axially locked on the third shaft sleeve 57 .
  • the outer surface of the third shaft sleeve 57 is provided with PVD coating.
  • the third shaft sleeve 57 has not been supported and suspended by the third air radial bearing 31, and dry friction will occur between the outer wall of the third shaft sleeve 57 and the third air radial bearing 31;
  • the surface of the triaxial sleeve 57 is relatively smooth and has a PVD coating on the surface, which has a low coefficient of friction and high hardness, and the number of contact frictions can reach more than 40,000 times. When the contact friction reaches the upper limit and is damaged, only the worn third shaft sleeve 57 needs to be replaced without replacing the third rotating shaft 3 , thereby increasing the service life of the third rotating shaft 3 .
  • the second shaft sleeve 55 and the third shaft sleeve 57 are axially symmetrically distributed along the center of mass of the motor shaft 1 so as to ensure that the second shaft sleeve 55 and the third shaft sleeve 57 do not affect the position of the center of mass of the motor shaft system.
  • the second air radial bearing 21 and the third air radial bearing 31 are respectively fixed on the first end cover 15 and the second end cover 16 .
  • the second end cover 16 is provided with a first thrust plate groove 161 and a second thrust plate groove 162, and the first thrust plate groove 161 and the second thrust plate groove 162 are oppositely arranged on the thrust plate 22 at both ends;
  • the axial air bearing 17 is provided with an axial limiter 171 for limiting the axial position of the thrust plate 22, and the two axial limiters 171 are respectively fixed in the first thrust plate groove 161 and the second thrust plate Groove 162. Therefore, it is ensured that the axial position limiting parts 171 located at both ends of the thrust disc 22 control the axial position of the thrust disc 22 to further control the axial position of the motor shaft 1 .

Abstract

本发明涉及空气悬浮鼓风机领域，尤其涉及一种推力轴承后置式空气悬浮鼓风机。该鼓风机包括电机轴系，电机轴系包括电机轴、第二转轴和第三转轴；第二转轴在轴向从内侧至外侧依次固定套设有第二空气径向轴承、推力盘、散热叶轮和第二锁紧螺母，第三转轴在轴向从内侧至外侧依次固定套设有第三空气径向轴承、鼓风叶轮和第三锁紧螺母；第二转轴、推力盘、散热叶轮和第二锁紧螺母各自的重量与其质心至电机轴中心位置的距离的乘积之和等于第三转轴、鼓风叶轮和第三锁紧螺母各自的重量与其质心至电机轴中心位置的距离的乘积之和。该鼓风机保证两侧的空气径向轴承受力均匀，提高空气径向轴承使用寿命。

Description

一种推力轴承后置式空气悬浮鼓风机 技术领域
本发明涉及空气悬浮鼓风机领域，尤其涉及一种推力轴承后置式空气悬浮鼓风机。
 背景技术
空气悬浮离心鼓风机是一种全新概念鼓风机，它采用超高速直联电机、空气悬浮轴承和高精度单级离心式叶轮三大核心高端科技，开创了高效率、高性能、低噪音、低能耗风机新纪元。
中国发明专利申请（公开号CN112228361A，公开日：20210115）公开了一种空气悬浮离心鼓风机，包括电机、蜗壳、叶轮、叶轮轴、轴承转轴、空气悬浮径向轴承和空气悬浮止推轴承，电机转子的前后两端分别通过轴承转轴与空气悬浮径向轴承转动连接，位于电机前端的轴承转轴通过推力盘与空气悬浮止推轴承转动连接，轴承转轴和推力盘的摩擦面设有PVD涂层，PVD涂层的摩擦系数小于或等于0.1，PVD涂层的厚度为2μm～8μm；空气悬浮径向轴承和空气悬浮止推轴承的摩擦面设有PTFE涂层，PTFE涂层的摩擦系数小于或等于0.05，PTFE涂层的厚度为0.02mm～0.05mm。采用本发明，具有结构紧凑、效率高、寿命长、稳定性好、启停次数高、电机温升低等优点。
 技术问题
现有技术存在以下不足：电机轴系中推力盘与鼓风叶轮设置在电机轴一侧，散热叶轮独自设置在电机轴另一侧；而鼓风叶轮与散热叶轮相比其质量较大，推力盘设置在质量较大的鼓风叶轮一侧后使得电机轴两侧质量差别较大；从而造成电机轴系的质心不在电机轴中心而是在靠近鼓风叶轮一侧，进而造成鼓风叶轮一侧的空气径向轴承与散热叶轮一侧的空气径向轴承相比受力较大，降低了单个空气径向轴承的使用寿命。
 技术解决方案
本发明的目的是：针对上述问题，提出将推力盘设置在散热叶轮一侧，使得电机轴系的质心在电机轴中心；进而保证两侧的空气径向轴承受力均匀，提高空气径向轴承使用寿命的一种推力轴承后置式空气悬浮鼓风机。
为了实现上述的目的，本发明采用了以下的技术方案：
一种推力轴承后置式空气悬浮鼓风机，该鼓风机包括电机轴系、电机外筒、电机内筒、电机定子、第一端盖、第二端盖和轴向空气轴承；第一端盖和第二端盖分别固定在电机外筒两端，电机内筒外壁嵌套至电机外筒内孔，电机定子固定在电机内筒上；电机轴系包括电机轴、第二转轴和第三转轴；电机轴设置有电机转子，第二转轴一端和第三转轴一端分别同轴固定连接至电机轴两端；第二转轴在轴向从内侧至外侧依次固定套设有第二空气径向轴承、推力盘、散热叶轮和第二锁紧螺母，第三转轴在轴向从内侧至外侧依次固定套设有第三空气径向轴承、鼓风叶轮和第三锁紧螺母；第二转轴、推力盘、散热叶轮和第二锁紧螺母各自的重量与其质心至电机轴中心位置的距离的乘积之和等于第三转轴、鼓风叶轮和第三锁紧螺母各自的重量与其质心至电机轴中心位置的距离的乘积之和。
作为优选，第二转轴包括第一轴段、第二轴段、第三轴段和第四轴段；第一轴段外壁和第四轴段外壁都设置有外螺纹，电机轴在位于第二转轴一端设置有第二凸台；第二凸台设置有带有内螺纹的内孔，第一轴段的外螺纹与第二凸台内孔的内螺纹相旋合至第二轴段内侧端面与第二凸台外侧端面相贴合位置。
作为优选，第二凸台的外壁上套设有第二轴套；第二转轴穿过第二轴套的内孔，第二轴套外壁与第二空气径向轴承可转动连接；第二轴套设置有第二轴套凸台，推力盘和散热叶轮都套设在第二轴套凸台外壁；第二锁紧螺母与第四轴段的外螺纹相旋合；第二锁紧螺母锁紧时，第二轴套轴向锁紧在第二转轴上，推力盘和散热叶轮轴向锁紧在第二轴套上。第二轴套外表面设置有PVD涂层。
作为优选，第三转轴包括第五轴段、第六轴段、第七轴段和第八轴段；第五轴段外壁和第八轴段外壁都设置有外螺纹，电机轴在位于第三转轴一端设置有第三凸台；第三凸台设置有带有内螺纹的内孔，五轴段的外螺纹与第三凸台内孔的内螺纹相旋合至第六轴段内侧端面与第三凸台外侧端面相贴合位置。
作为优选，第三凸台的外壁上套设有第三轴套；第三转轴穿过第三轴套的内孔，第三轴套外壁与第三空气径向轴承可转动连接；第三轴套设置有第三轴套凸台，鼓风叶轮套设在第三轴套凸台外壁，第三锁紧螺母与第八轴段的外螺纹相旋合；第三锁紧螺母锁紧时，第三轴套轴向锁紧在第三转轴上，鼓风叶轮轴向锁紧在第三轴套上。第三轴套外表面设置有PVD涂层。
作为优选，第二轴套和第三轴套沿着电机轴的质心轴向对称分布。
作为优选，第二空气径向轴承和第三空气径向轴承分别固定在第一端盖、第二端盖上。第二端盖上设置有第一推力盘凹槽和第二推力盘凹槽，第一推力盘凹槽和第二推力盘凹槽相对设置在推力盘两端；轴向空气轴承设置有用于限制推力盘轴向位置的轴向限位部，两个轴向限位部分别固定在第一推力盘凹槽和第二推力盘凹槽上。
 有益效果
本发明采用上述技术方案的一种推力轴承后置式空气悬浮鼓风机的优点是：
第二转轴、推力盘、散热叶轮、第二锁紧螺母、第三转轴、鼓风叶轮和第三锁紧螺母都为回转体零件，其各自的质心都位于回转中心；同时，电机轴、第二转轴和第三转轴三者同轴连接，即以上回转体零件的各自的质心都位于电机轴的轴线上；而且，第二转轴、推力盘、散热叶轮和第二锁紧螺母各自的重量与其质心至电机轴中心位置的距离的乘积之和等于第三转轴、鼓风叶轮和第三锁紧螺母各自的重量与其质心至电机轴中心位置的距离的乘积之和；即第二转轴上零件对电机轴系质心位置的影响和第三转轴上零件对电机轴系质心位置的影响相抵消，从而使得电机轴系质心保持在电机轴中心位置；进而使得电机轴两侧的第二空气径向轴承和第三空气径向轴承受力均匀，提高空气径向轴承使用寿命。
 附图说明
图1为本发明的结构示意图。
图2为电机轴系的结构示意图。
A-电机轴系的质心位置。
 本发明的最佳实施方式
如图1、图2所示的一种推力轴承后置式空气悬浮鼓风机，该鼓风机包括电机轴系、电机外筒12、电机内筒13、电机定子14、第一端盖15、第二端盖16和轴向空气轴承17；第一端盖15和第二端盖16分别固定在电机外筒12两端，电机内筒13外壁嵌套至电机外筒12内孔，电机定子14固定在电机内筒13上；电机轴系包括电机轴1、第二转轴2和第三转轴3；电机轴1设置有电机转子11，第二转轴2一端和第三转轴3一端分别同轴固定连接至电机轴1两端；第二转轴2在轴向从内侧至外侧依次固定套设有第二空气径向轴承21、推力盘22、散热叶轮23和第二锁紧螺母24，第三转轴3在轴向从内侧至外侧依次固定套设有第三空气径向轴承31、鼓风叶轮32和第三锁紧螺母33；第二转轴2、推力盘22、散热叶轮23和第二锁紧螺母24各自的重量与其质心至电机轴1中心位置的距离的乘积之和等于第三转轴3、鼓风叶轮32和第三锁紧螺母33各自的重量与其质心至电机轴1中心位置的距离的乘积之和。而此种方式中，第二锁紧螺母24和第三锁紧螺母33的锁紧方向与轴系运转方向相反，高速运转时，可以起到防松作用。第二转轴2、推力盘22、散热叶轮23、第二锁紧螺母24、第三转轴3、鼓风叶轮32和第三锁紧螺母33都为回转体零件，其各自的质心都位于回转中心；同时，电机轴1、第二转轴2和第三转轴3三者同轴连接，即以上回转体零件的各自的质心都位于电机轴1的轴线上；而且，第二转轴2、推力盘22、散热叶轮23和第二锁紧螺母24各自的重量与其质心至电机轴1中心位置的距离的乘积之和等于第三转轴3、鼓风叶轮32和第三锁紧螺母33各自的重量与其质心至电机轴1中心位置的距离的乘积之和；即第二转轴2上零件对电机轴系质心位置的影响和第三转轴3上零件对电机轴系质心位置的影响相抵消，从而使得电机轴系质心保持在电机轴1中心位置；进而使得电机轴1两侧的第二空气径向轴承21和第三空气径向轴承31受力均匀，提高空气径向轴承使用寿命。
如图2所示，第二转轴2包括第一轴段521、第二轴段522、第三轴段523和第四轴段524；第一轴段521外壁和第四轴段524外壁都设置有外螺纹，电机轴1在位于第二转轴2一端设置有第二凸台54；第二凸台54设置有带有内螺纹的内孔，第一轴段521的外螺纹与第二凸台54内孔的内螺纹相旋合至第二轴段522内侧端面与第二凸台54外侧端面相贴合位置。
第二凸台54的外壁上套设有第二轴套55；第二转轴2穿过第二轴套55的内孔，第二轴套55外壁与第二空气径向轴承21可转动连接；第二轴套55设置有第二轴套凸台551，推力盘22和散热叶轮23都套设在第二轴套凸台551外壁；第二锁紧螺母24与第四轴段524的外螺纹相旋合；第二锁紧螺母24锁紧时，第二轴套55轴向锁紧在第二转轴2上，推力盘22和散热叶轮23轴向锁紧在第二轴套55上。第二轴套55外表面设置有PVD涂层。在空气悬浮鼓风机刚启动时，第二轴套55还未被第二空气径向轴承21支撑悬浮，第二轴套55外壁与第二空气径向轴承21之间会产生干摩擦；而由于第二轴套55表面较光滑并且其表面具有PVD涂层，摩擦系数低，硬度高，接触式摩擦次数可达到40000次以上。当接触式摩擦达到上限发生损坏时，只需要更换磨损的第二轴套55即可而不需要更换第二转轴2，从而增加了第二转轴2的使用寿命。
第三转轴3包括第五轴段531、第六轴段532、第七轴段533和第八轴段534；第五轴段531外壁和第八轴段534外壁都设置有外螺纹，电机轴1在位于第三转轴3一端设置有第三凸台56；第三凸台56设置有带有内螺纹的内孔，五轴段531的外螺纹与第三凸台56内孔的内螺纹相旋合至第六轴段532内侧端面与第三凸台56外侧端面相贴合位置。
第三凸台56的外壁上套设有第三轴套57；第三转轴3穿过第三轴套57的内孔，第三轴套57外壁与第三空气径向轴承31可转动连接；第三轴套57设置有第三轴套凸台571，鼓风叶轮32套设在第三轴套凸台571外壁，第三锁紧螺母33与第八轴段534的外螺纹相旋合；第三锁紧螺母33锁紧时，第三轴套57轴向锁紧在第三转轴3上，鼓风叶轮32轴向锁紧在第三轴套57上。第三轴套57外表面设置有PVD涂层。在空气悬浮鼓风机刚启动时，第三轴套57还未被第三空气径向轴承31支撑悬浮，第三轴套57外壁与第三空气径向轴承31之间会产生干摩擦；而由于第三轴套57表面较光滑并且其表面具有PVD涂层，摩擦系数低，硬度高，接触式摩擦次数可达到40000次以上。当接触式摩擦达到上限发生损坏时，只需要更换磨损的第三轴套57即可而不需要更换第三转轴3，从而增加了第三转轴3的使用寿命。
第二轴套55和第三轴套57沿着电机轴1的质心轴向对称分布从而保证第二轴套55和第三轴套57不影响电机轴系的质心位置。第二空气径向轴承21和第三空气径向轴承31分别固定在第一端盖15、第二端盖16上。
如图1所示，第二端盖16上设置有第一推力盘凹槽161和第二推力盘凹槽162，第一推力盘凹槽161和第二推力盘凹槽162相对设置在推力盘22两端；轴向空气轴承17设置有用于限制推力盘22轴向位置的轴向限位部171，两个轴向限位部171分别固定在第一推力盘凹槽161和第二推力盘凹槽162上。从而保证位于推力盘22两端的轴向限位部171通过控制推力盘22的轴向位置进而控制电机轴1的轴向位置。

Claims (10)

  1. 一种推力轴承后置式空气悬浮鼓风机，其特征在于，该鼓风机包括电机轴系、电机外筒（12）、电机内筒（13）、电机定子（14）、第一端盖（15）、第二端盖（16）和轴向空气轴承（17）；第一端盖（15）和第二端盖（16）分别固定在电机外筒（12）两端，电机内筒（13）外壁嵌套至电机外筒（12）内孔，电机定子（14）固定在电机内筒（13）上；电机轴系包括电机轴（1）、第二转轴（2）和第三转轴（3）；电机轴（1）设置有电机转子（11），第二转轴（2）一端和第三转轴（3）一端分别同轴固定连接至电机轴（1）两端；第二转轴（2）在轴向从内侧至外侧依次固定套设有第二空气径向轴承（21）、推力盘（22）、散热叶轮（23）和第二锁紧螺母（24），第三转轴（3）在轴向从内侧至外侧依次固定套设有第三空气径向轴承（31）、鼓风叶轮（32）和第三锁紧螺母（33）；第二转轴（2）、推力盘（22）、散热叶轮（23）和第二锁紧螺母（24）各自的重量与其质心至电机轴（1）中心位置的距离的乘积之和等于第三转轴（3）、鼓风叶轮（32）和第三锁紧螺母（33）各自的重量与其质心至电机轴（1）中心位置的距离的乘积之和。
  2. 根据权利要求1所述的一种推力轴承后置式空气悬浮鼓风机，其特征在于，第二转轴（2）包括第一轴段（521）、第二轴段（522）、第三轴段（523）和第四轴段（524）；第一轴段（521）外壁和第四轴段（524）外壁都设置有外螺纹，电机轴（1）在位于第二转轴（2）一端设置有第二凸台（54）；第二凸台（54）设置有带有内螺纹的内孔，第一轴段（521）的外螺纹与第二凸台（54）内孔的内螺纹相旋合至第二轴段（522）内侧端面与第二凸台（54）外侧端面相贴合位置。
  3. 根据权利要求2所述的一种推力轴承后置式空气悬浮鼓风机，其特征在于，第二凸台（54）的外壁上套设有第二轴套（55）；第二转轴（2）穿过第二轴套（55）的内孔，第二轴套（55）外壁与第二空气径向轴承（21）可转动连接；第二轴套（55）设置有第二轴套凸台（551），推力盘（22）和散热叶轮（23）都套设在第二轴套凸台（551）外壁；第二锁紧螺母（24）与第四轴段（524）的外螺纹相旋合；第二锁紧螺母（24）锁紧时，第二轴套（55）轴向锁紧在第二转轴（2）上，推力盘（22）和散热叶轮（23）轴向锁紧在第二轴套（55）上。
  4. 根据权利要求3所述的一种推力轴承后置式空气悬浮鼓风机，其特征在于，第二轴套（55）外表面设置有PVD涂层。
  5. 根据权利要求1所述的一种推力轴承后置式空气悬浮鼓风机，其特征在于，第三转轴（3）包括第五轴段（531）、第六轴段（532）、第七轴段（533）和第八轴段（534）；第五轴段（531）外壁和第八轴段（534）外壁都设置有外螺纹，电机轴（1）在位于第三转轴（3）一端设置有第三凸台（56）；第三凸台（56）设置有带有内螺纹的内孔，五轴段（531）的外螺纹与第三凸台（56）内孔的内螺纹相旋合至第六轴段（532）内侧端面与第三凸台（56）外侧端面相贴合位置。
  6. 根据权利要求5所述的一种推力轴承后置式空气悬浮鼓风机，其特征在于，第三凸台（56）的外壁上套设有第三轴套（57）；第三转轴（3）穿过第三轴套（57）的内孔，第三轴套（57）外壁与第三空气径向轴承（31）可转动连接；第三轴套（57）设置有第三轴套凸台（571），鼓风叶轮（32）套设在第三轴套凸台（571）外壁，第三锁紧螺母（33）与第八轴段（534）的外螺纹相旋合；第三锁紧螺母（33）锁紧时，第三轴套（57）轴向锁紧在第三转轴（3）上，鼓风叶轮（32）轴向锁紧在第三轴套（57）上。
  7. 根据权利要求6所述的一种推力轴承后置式空气悬浮鼓风机，其特征在于，第三轴套（57）外表面设置有PVD涂层。
  8. 根据权利要求3或6所述的一种推力轴承后置式空气悬浮鼓风机，其特征在于，第二轴套（55）和第三轴套（57）沿着电机轴（1）的质心轴向对称分布。
  9. 根据权利要求1所述的一种推力轴承后置式空气悬浮鼓风机，其特征在于，第二空气径向轴承（21）和第三空气径向轴承（31）分别固定在第一端盖（15）、第二端盖（16）上。
  10. 根据权利要求1所述的一种推力轴承后置式空气悬浮鼓风机，其特征在于，第二端盖（16）上设置有第一推力盘凹槽（161）和第二推力盘凹槽（162），第一推力盘凹槽（161）和第二推力盘凹槽（162）相对设置在推力盘（22）两端；轴向空气轴承（17）设置有用于限制推力盘（22）轴向位置的轴向限位部（171），两个轴向限位部（171）分别固定在第一推力盘凹槽（161）和第二推力盘凹槽（162）上。
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CN112228361A (zh) * 2020-09-18 2021-01-15 益鑫能源科技(上海)有限公司 一种空气悬浮离心鼓风机
CN113404704A (zh) * 2021-06-28 2021-09-17 鑫磊压缩机股份有限公司 一种推力轴承后置式空气悬浮鼓风机
CN215672762U (zh) * 2021-06-28 2022-01-28 鑫磊压缩机股份有限公司 一种推力轴承后置式空气悬浮鼓风机

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