WO2019064880A1 - Ventilateur axial - Google Patents

Ventilateur axial Download PDF

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Publication number
WO2019064880A1
WO2019064880A1 PCT/JP2018/028350 JP2018028350W WO2019064880A1 WO 2019064880 A1 WO2019064880 A1 WO 2019064880A1 JP 2018028350 W JP2018028350 W JP 2018028350W WO 2019064880 A1 WO2019064880 A1 WO 2019064880A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
frame
shaft holder
hole
impeller
Prior art date
Application number
PCT/JP2018/028350
Other languages
English (en)
Japanese (ja)
Inventor
雅俊 大林
正 岡部
内田　俊哉
悠輔 齋藤
中田　佑希
Original Assignee
日本電産コパル電子株式会社
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.)
Filing date
Publication date
Application filed by 日本電産コパル電子株式会社 filed Critical 日本電産コパル電子株式会社
Publication of WO2019064880A1 publication Critical patent/WO2019064880A1/fr

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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
    • 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
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/058—Bearings magnetic; electromagnetic
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/64—Mounting; Assembling; Disassembling of axial 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing

Definitions

  • the present invention relates to axial fans.
  • An object of embodiments of the present invention is to provide an axial flow fan that facilitates mass imbalance correction of a rotating body.
  • An axial flow fan includes a shaft as a rotating shaft, an air dynamic pressure bearing that suppresses variation in the radial direction of the shaft by air dynamic pressure, and a ring-shaped shaft in the first hole.
  • a third frame provided at the center of a circular surface on which the shaft holder is fitted, and a frame having a shape in which one end of a cylindrical shape is closed and the frame is accommodated so as to accommodate the frame therein.
  • an impeller provided with a hole.
  • FIG. 1 is a perspective view showing a configuration of an axial flow fan according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing the configuration of the axial flow fan according to the embodiment.
  • FIG. 3 is a perspective view showing the configuration of the motor main body according to the embodiment.
  • FIG. 4 is a perspective view showing the configuration from the lower side of the impeller according to the embodiment.
  • FIG. 5 is a perspective view showing a state in which the impeller according to the embodiment is attached to the motor main body.
  • FIG. 6 is a perspective view showing a configuration in which the outer frame according to the embodiment is vertically cut.
  • FIG. 1 is a perspective view showing the configuration of an axial fan 10 according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing the configuration of the axial flow fan 10 according to the embodiment.
  • the axial fan 10 is used, for example, as a cooling fan for cooling the server.
  • the axial fan 10 includes a motor body 1, an impeller 2 and an outer frame 3.
  • FIG. 3 is a perspective view showing the configuration of the motor main body 1 according to the embodiment.
  • the motor body 1 is divided into a rotating body that rotates and a stationary portion that is stationary with respect to the rotation of the rotating body.
  • the rotating body of the motor main body 1 includes a shaft 11, a shaft holder 12, a frame 13, and a magnet 14.
  • the shaft holder 12 and the frame 13 form a rotor holder.
  • the stationary portion of the motor body 1 is configured of a substrate 15, a plurality of coils 16, a core 17, and a plurality of support members 18.
  • the shaft 11 is a rotating shaft of a rotating body, and has a cylindrical shape.
  • the shaft 11 is made of metal such as iron.
  • the shaft holder 12 is ring-shaped, the front surface is flat, and the back surface is shaped to fit in the hole of the frame 13.
  • the shaft holder 12 is joined in a state in which the upper portion of the shaft 11 is fitted in the center hole of the surface.
  • the bottom portion of the shaft holder 12 is joined to the top of the frame 13.
  • the shaft holder 12 is made of metal that can be cut.
  • the shaft holder 12 is made of brass but may be made of steel. Brass is more suitable for the shaft holder 12 because it is less likely to rust than steel.
  • the material of the shaft holder 12 that is close to the metal of the material of the frame 13 and having a linear expansion coefficient, the shift between the shaft holder 12 and the frame 13 due to thermal expansion is suppressed.
  • the shaft holder 12 is preferably made of brass or steel.
  • the frame 13 has a shape in which a hole from which the shaft 11 protrudes is provided at the center on a circular surface (upper surface) that closes one end of the cylindrical shape.
  • the hole in the upper surface of the frame 13 is closed in such a manner that the gap formed between the shaft 11 and the frame 13 is covered by the shaft holder 12 when the shaft 11 passes through.
  • the frame 13 is made of metal such as iron.
  • the frame 13 is formed by pressing.
  • the magnet 14 is a permanent magnet for providing a function as a rotor of the motor body 1.
  • the magnet 14 has a cylindrical shape and is attached to the inside of the frame 13.
  • the substrate 15 is in the shape of a disk having a hole at its center through which the shaft 11 passes.
  • a control circuit for driving the motor body 1 is mounted on the substrate 15.
  • the substrate 15 is provided with a sensor 151 for detecting the rotational position of the rotor.
  • the substrate 15 may be used for a sensorless motor in which the sensor 151 is not provided. Further, the substrate 15 may be attached to the outer frame 3 instead of the motor body 1. Such a configuration is used, for example, in a sensorless motor.
  • the coil 16 and the core 17 are provided inside the frame 13.
  • the coils 16 are wound around the core 17 and circumferentially equally spaced around the shaft 11.
  • the coil 16 and the core 17 have a function as a stator of the motor body 1.
  • the core 17 may be composed of any number of members.
  • the core 17 may be formed by stacking thin plates in the rotational axis direction to suppress eddy current loss.
  • the plurality of support members 18 include a member for supporting the rotating body to rotate with respect to the stationary portion of the motor body 1 and a member for supporting the stationary portion of the motor body 1 to be fixed to the outer frame 3 .
  • the support member 18 is a member for disposing the coil 16 and the core 17 or a rod-like member which is fixed to the outer frame 3 by penetrating the small hole provided in the substrate 15.
  • FIG. 4 is a perspective view showing the configuration from the lower side of the impeller 2 according to the embodiment.
  • FIG. 5 is a perspective view showing a state in which the impeller 2 according to the embodiment is attached to the motor body 1.
  • the impeller 2 is made of resin such as plastic.
  • the impeller 2 has a shape in which a plurality of blades 22 are provided on an impeller main body 21 having a shape in which one end of a cylindrical shape is closed.
  • the impeller main body 21 has a shape in which a hole in which the outer peripheral surface of the shaft holder 12 is fitted is provided at the center on a circular surface (upper surface).
  • the periphery of the hole on the upper surface of the impeller body 21 has a sufficient thickness to prevent cracks due to thermal expansion.
  • the inner shape of the impeller body 21 is such that the frame 13 fits from the top. Inside the impeller main body 21 may be provided a recess for applying an adhesive for bonding to the frame 13.
  • the impeller 2 is attached to the frame 13 so that the outer shape of the shaft holder 12 fits in the hole on the upper surface.
  • the motor main body 1 is in a centered state.
  • the inner peripheral surface of the impeller main body 21 and the outer peripheral surface of the frame 13 are bonded with an adhesive.
  • FIG. 6 is a perspective view showing a configuration in which the outer frame 3 according to the embodiment is vertically cut.
  • the outer frame 3 includes a cup portion 31, a plurality of stationary blades (ribs) 32, an outer portion 33, a bearing sleeve 34, and a magnetic bearing 35.
  • the cup portion 31 is disposed at the center of the bottom portion of the outer frame 3.
  • the cup portion 31 is a place where the motor body 1 is mounted.
  • the motor body 1 is mounted on the bottom of the cup portion 31 such that the impeller 2 is on top.
  • the substrate 15 is arranged to be fixed to the inside of the cup portion 31.
  • the outer shape of the cup portion 31 is one size larger than the outer shape of the substrate 15. Therefore, when the motor body 1 is mounted, there is a slight gap between the vertically extending outer edge on the outer periphery of the cup portion 31 and the substrate 15.
  • the substrate 15 is attached to the outer frame 3, the substrate 15 is bonded to the outer edge of the cup portion 31, and a slight gap is formed on the inner periphery of the hole at a position where the shaft 11 penetrates the hole at the center.
  • a slight gap is formed on the inner periphery of the hole at a position where the shaft 11 penetrates the hole at the center.
  • the stationary wings 32 are provided at equal intervals around the cup portion 31 so as to connect the outer peripheral surface of the cup portion 31 and the inner peripheral surface of the outer portion 33.
  • the stationary wing 32 is shaped in such a way that the wind passes between the two adjacent stationary wings 32 in the direction of the rotation axis according to the rotation of the rotating body.
  • the stationary wing 32 is formed in a thin shape with a flexible material such as a resin to secure the flow characteristics of air.
  • the outer portion 33 is a portion covering the outermost side of the axial flow fan 10.
  • the outer shape portion 33 has a shape in which a square flange portion provided with a hole for attaching the axial flow fan 10 to a mounting location is attached to both ends of a cylindrical shape portion in which the motor body 1 is accommodated.
  • a bearing sleeve 34 is provided at the center of the cup portion 31.
  • the bearing sleeve 34 is cylindrical in shape.
  • the motor body 1 is mounted such that the shaft 11 is inserted into the bearing sleeve 34.
  • the bearing sleeve 34 is an air dynamic pressure bearing for suppressing the fluctuation of the shaft 11 in the radial direction.
  • the air dynamic pressure around the shaft 11 keeps the gap between the shaft 11 and the bearing sleeve 34 constant, whereby the fluctuation of the shaft 11 is suppressed. Therefore, when the shaft 11 rotates, the shaft 11 and the bearing sleeve 34 are kept in non-contact with each other.
  • the magnetic bearing 35 is provided at a portion located on the bottom surface of the bearing sleeve 34.
  • the magnetic bearing 35 is mainly composed of permanent magnets.
  • the magnetic bearing 35 suppresses the fluctuation of the shaft 11 in the thrust direction by utilizing the attractive force or the repulsive force due to the magnetism of the permanent magnets. Therefore, the shaft 11 and the magnetic bearing 35 are kept in non-contact with each other.
  • the magnetic bearing 35 not only the magnetic bearing 35 but any thing may be used.
  • the magnetic bearing 35 as long as it is a non-contact type bearing in which the shaft 11 is kept non-contacting, it has good durability and is suitable for high-speed rotation, it may be a contact type.
  • the shaft holder 12 is provided around the top of the shaft 11.
  • the material of the shaft holder 12 is brass which has a relatively high specific gravity and is easy to cut. Therefore, by cutting the shaft holder 12, mass imbalance correction of the negative balance method is performed.
  • mass imbalance correction of the negative balance method is performed.
  • the mass balance of the rotor of the axial fan 10 is measured. Based on this measurement result, the location and depth at which the shaft holder 12 is drilled are determined. According to this determination result, the shaft holder 12 is bored with a drill.
  • the location and depth of the hole can be determined mechanically by using a conventionally known method. Therefore, from the measurement of the mass balance, the location and depth of the hole may be determined, and the process of performing the mass imbalance correction process on the shaft holder 12 may be automated.
  • a portion where the outer peripheral surface of the upper portion of the shaft holder 12 and the inside of the hole on the upper surface of the impeller 2 are in contact with each other is defined as a centering point SN of the axial flow fan 10.
  • centering adjustment is performed so that the center of the rotation axis of the shaft 11 is at a desired position at the centering position SN.
  • each component is thermally expanded by the heat generated by the operation of the axial flow fan 10.
  • the influence of the thermal expansion is smaller at the centering point SN inside the hole of the upper surface whose diameter is smaller than the inner peripheral surface of the impeller 2.
  • the outer peripheral surface of the shaft holder 12 as the centering location SN and the impeller 2
  • the gap between the top of the hole and the inside of the hole may be 0-50 ⁇ m.
  • the centering adjustment at the centering position SN it is not necessary to center at the contact portion between the inner peripheral surface of the impeller 2 and the outer peripheral surface of the frame 13, so the gap at this portion is the impeller 2 and the frame 13. In consideration of the difference in the linear expansion coefficient of the above, it can be made wide enough not to cause a crack. Further, by setting the centering position SN inside the hole on the upper surface having a diameter smaller than the inner peripheral surface of the impeller 2, the width of the gap that needs to be secured in consideration of thermal expansion may be narrow. Accuracy can be increased.
  • the centering may be performed at the point of contact between the inner peripheral surface of the impeller 2 of the axial flow fan 10 and the outer peripheral surface of the frame 13 or at any other position.
  • the inner peripheral surface of the impeller 2 is centered by centering at the centering point SN where the outer peripheral surface of the shaft holder 12 in which the shaft 11 is fitted in the central hole and the inner side of the upper surface of the impeller 2 contact.
  • the gap between the inner peripheral surface of the impeller 2 and the outer peripheral surface of the frame 13 can be secured widely considering the thermal expansion.
  • the diameter of the centering location SN of the impeller 2 is smaller than the diameter of the inner peripheral surface of the impeller 2, so the magnitude of change due to thermal expansion also decreases. Therefore, by performing centering at the centering position SN, the width of the gap in consideration of thermal expansion can be reduced as compared to the case where centering is performed on the inner peripheral surface of the impeller 2, so the centering accuracy is high. can do.
  • the present invention is not limited to the above-described embodiment, and the constituent elements may be deleted, added or changed. Further, by combining or exchanging the constituent elements in a plurality of embodiments, a new embodiment may be made. Even if such an embodiment differs directly from the above-described embodiment, the description of the same principle as the present invention is omitted as it is described as the embodiment of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

La présente invention porte sur un ventilateur axial (10) comprenant un arbre (11) qui est un arbre rotatif, un palier à pression dynamique d'air (34) supprimant des fluctuations radiales de l'arbre (11) au moyen d'une pression dynamique d'air, un support d'arbre (12) qui a une forme annulaire, a un premier trou dans lequel l'arbre (11) est ajusté et assemblé, et corrige un déséquilibre de masse en étant coupé, un cadre (13) ayant une forme cylindrique dont l'une des extrémités est fermée avec un plan circulaire pourvu d'un second trou au milieu qui est équipé du support d'arbre (12) et fermé par celui-ci, et une roue (2) qui recouvre le cadre (13) de façon à recevoir le cadre (13) et comporte un troisième trou prévu au milieu du plan circulaire dans lequel le support d'arbre (12) est monté.
PCT/JP2018/028350 2017-09-26 2018-07-27 Ventilateur axial WO2019064880A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-185309 2017-09-26
JP2017185309A JP2019060281A (ja) 2017-09-26 2017-09-26 軸流ファン

Publications (1)

Publication Number Publication Date
WO2019064880A1 true WO2019064880A1 (fr) 2019-04-04

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ID=65901618

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/028350 WO2019064880A1 (fr) 2017-09-26 2018-07-27 Ventilateur axial

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JP (1) JP2019060281A (fr)
TW (1) TW201915344A (fr)
WO (1) WO2019064880A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000009090A (ja) * 1998-06-23 2000-01-11 Matsushita Electric Ind Co Ltd 冷却ファン及びそれを用いたヒートシンク装置
JP3082701U (ja) * 2001-06-14 2001-12-26 皚▲文▼科技股▲分▼有限公司 ファン
JP2002034205A (ja) * 2000-07-17 2002-01-31 Shicoh Eng Co Ltd 含油軸受を用いたファンモータ
JP2009247143A (ja) * 2008-03-31 2009-10-22 Nidec Sankyo Corp ファンモータ
DE102015112731A1 (de) * 2015-08-03 2017-02-09 Ebm-Papst St. Georgen Gmbh & Co. Kg Lüftervorrichtung und Verfahren zur Auswuchtung einer Lüftervorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000009090A (ja) * 1998-06-23 2000-01-11 Matsushita Electric Ind Co Ltd 冷却ファン及びそれを用いたヒートシンク装置
JP2002034205A (ja) * 2000-07-17 2002-01-31 Shicoh Eng Co Ltd 含油軸受を用いたファンモータ
JP3082701U (ja) * 2001-06-14 2001-12-26 皚▲文▼科技股▲分▼有限公司 ファン
JP2009247143A (ja) * 2008-03-31 2009-10-22 Nidec Sankyo Corp ファンモータ
DE102015112731A1 (de) * 2015-08-03 2017-02-09 Ebm-Papst St. Georgen Gmbh & Co. Kg Lüftervorrichtung und Verfahren zur Auswuchtung einer Lüftervorrichtung

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Publication number Publication date
JP2019060281A (ja) 2019-04-18
TW201915344A (zh) 2019-04-16

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