JP2004197587A - Electric blower - Google Patents

Electric blower Download PDF

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Publication number
JP2004197587A
JP2004197587A JP2002364593A JP2002364593A JP2004197587A JP 2004197587 A JP2004197587 A JP 2004197587A JP 2002364593 A JP2002364593 A JP 2002364593A JP 2002364593 A JP2002364593 A JP 2002364593A JP 2004197587 A JP2004197587 A JP 2004197587A
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JP
Japan
Prior art keywords
motor
cooling
bracket
fan
blower
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
JP2002364593A
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Japanese (ja)
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JP4029333B2 (en
Inventor
Mamoru Hayatsu
守 早津
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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 Mitsubishi Electric Home Appliance Co Ltd, Mitsubishi Electric Corp filed Critical Mitsubishi Electric Home Appliance Co Ltd
Priority to JP2002364593A priority Critical patent/JP4029333B2/en
Priority to KR10-2003-0005526A priority patent/KR100496552B1/en
Priority to CNB03106728XA priority patent/CN100378340C/en
Publication of JP2004197587A publication Critical patent/JP2004197587A/en
Application granted granted Critical
Publication of JP4029333B2 publication Critical patent/JP4029333B2/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/02—Details
    • A61N1/04—Electrodes
    • A61N1/0404—Electrodes for external use
    • A61N1/0472—Structure-related aspects
    • A61N1/0492—Patch electrodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/02—Details
    • A61N1/08—Arrangements or circuits for monitoring, protecting, controlling or indicating
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/36014—External stimulators, e.g. with patch electrodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/0658—Radiation therapy using light characterised by the wavelength of light used
    • A61N2005/0659—Radiation therapy using light characterised by the wavelength of light used infrared

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower capable of realizing high cooling efficiency and long service life by reducing suction loss of cooling air for cooling a motor for high cooling efficiency. <P>SOLUTION: A cooling air guide 9b which is brought into close contact with an outer periphery of a bearing housing 5a provided in the middle portion of a bracket 5 fixed at an opening portion of a motor frame 1 is provided in the middle portion of a suction port 9a of a partition member 9 for partitioning a cooling fan 8 and the motor 2, so that the air sucked by the cooling fan 8 flows into the cooling fan 8 without changing its direction along the cooling air guide 9b. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、電気掃除機等に使用される電動送風機に関するものである。
【０００２】
【従来の技術】
従来のこの種電動送風機に、一対のブラケットにより固定された固定子と、固定子の中に設けられ一方がブラケットから長手方向に延びた出力軸を有する回転子と、その出力軸に取り付けられた回転ファンと、前記固定子及び回転子と前記回転ファンとの間を仕切るように取り付けられたエアガイドと、前記回転ファン及びエアガイドを覆うように取り付けられた外周部に複数個の風穴の開いたファンケースから構成された電動送風機において、吸気口が電動送風機の外側を向き外気を吸引する送風用回転ファンと、吸気口が電動送風機の内側を向き送風機内の空気を吸引する冷却用回転ファンとを近接して配置させ、各々の回転ファンから排出される風が共通のファンケース外周部の風穴から排出するようにしたものがある（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開２００２−３１０９０号公報（第３頁、図１）
【０００４】
【発明が解決しようとする課題】
特許文献１に記載された電動送風機においては、冷却用回転ファンにより固定子及び回転子側より冷却風を吸引する際、冷却ファンと固定子及び回転子側を仕切る仕切り部材の吸込口は、ブラケットの中央に設けられた軸受ハウジング部に隣接しているため、十分な風路が確保されていないと共に、そこを流れる空気は、ブラケットの軸受ハウジング部の形状に沿う形で方向を変えながら吸込口に流れ込むため損失が生じ、モータ部を冷却するのに十分な風量が得られないという問題があった。
【０００５】
本発明は、上記の課題を解決するためになされたもので、モータ等を冷却する冷却風の吸引損失の低減を図ることで冷却効率を改善し、高効率で長寿命の電動送風機を提供することを目的としたものである。
【０００６】
【課題を解決するための手段】
本発明は、上部が開口され側面に通気孔を有し底部中央部に軸受ハウジングが設けられたモータフレームと、該モータフレームの開口部側に固定され中央部に軸受ハウジングが設けられたブラケットと、前記モータフレームとブラケットの軸受ハウジングに支持された回転子及び固定子とからなるモータと、前記ブラケットの上方においてモータの軸に固定され吸引した空気を周縁から排出する送風ファンと、該送風ファンのモータ側に固定され前記モータフレームの通気孔から吸引した空気を周縁から排出する冷却ファンと、中央部に吸込口が設けられ前記冷却ファンとモータ側を仕切る仕切り部材とを備えた電動送風機において、前記仕切り部材の吸込口の中央部に前記ブラケットに設けた軸受ハウジングの外周部に密着する送風ガイドを設けたものである。
【０００７】
【発明の実施の形態】
図１は本発明の一実施の形態に係る電動送風機の一部縦断面図、図２は図１の要部の拡大図、図３は図１の仕切り部材とブラケットとの関係を示す平面図である。
図において、モータフレーム１は上部が開口され側面に複数の通気孔１ａを有し、底部中央部に凹状の軸受ハウジング１ｂが設けられており、内部には固定子３と高速で回転する回転子４とからなるモータ２が設置されている。
【０００８】
また、モータフレーム１の上部開口部に固定されたブラケット５は、中央部に軸受ハウジング５ａを有し、その周囲には第１の通気口５ｂが設けられ、さらに通気孔５ｂの外周でモータフレーム１の外周には複数の第２の通気孔５ｃが設けられている。そして、モータ２は、回転子４の軸４ａの両端に設けた軸受６が、モータフレーム１及びブラケット５の軸受ハウジング１ａ，５ａによって支持されている。また、中央部に吸引口７ａを有する送風ファン７は、回転子４の軸４ａに固定されて回転子４と共に回転する。８は中央部に吸込口８ａを有し、送風ファン７の背面側（モータ２側）に固定された冷却ファンである。
【０００９】
モータ２と冷却ファン７を仕切る仕切り部材９は、冷却ファン８の吸込口８ａとほぼ等しい径の吸込口９ａを有し、この吸込口９ａの中央部にはブラケット５の軸受ハウジング５ａの外周に密着する送風ガイド９ｂが設けられており、この送風ガイド９ｂは複数のリブ９ｃにより仕切り部材９と一体的に連結されている。また、ブラケット５の第１の通気口５ｂと第２の通気口５ｃとを仕切る円筒状の脚部９ｄを有し、この脚部９ｄの背面側には、冷却ファン８から排出された空気を、ブラケット５の第２の通気口５ｃへ案内する複数のブレード９ｅが設けられている。
【００１０】
送風ファン７側と冷却ファン８側を仕切るケーシング１０は、仕切り部材９のブレード９ｅの上面に当接され、ブラケット５の外周部に圧入して固定されており、中央部には開口部１０ａが設けられている。１１は案内羽根で、ケーシング１０の外周部上面に固定され、送風ファン７から吐出された空気を外周方向へ導く。送風ファン７及び案内羽根１１を覆うファンカバー１２は、中央部に吸引口１２ａを有し、側面には案内羽根１１から外周方向へ案内された空気を外部へ排出する複数の排気孔１２ｂが設けられている。
【００１１】
上記のように構成した電動送風機において、モータ２を駆動すると、回転子４の軸４ａに取り付けけた送風ファン７及び冷却ファン８が回転し、外気を吸引する。そして、送風ファン７の吸引口７ａから吸引された空気は、図中矢印Ａで示すように、送風ファン７の内部を通り、案内羽根１１で整流されて圧力を回復しながらファンカバー１２の側面に設けた排気口１２ｂから外部へ排出される。
【００１２】
一方、冷却ファン８によって吸引された空気は、図中矢印Ｂで示すように、モータフレーム１の通気口１ｂから流入し、固定子３、回転子４等を冷却しながら、仕切り部材９の送風ガイド９ｂの外周に設けた吸込口９ａから冷却ファン８の吸込口８ａに流入し、冷却ファン８の内部を通って外周部から流出し、ブレード９ｅに案内されてブラケット５の第２の通気口５ｃから外部に排出される。
【００１３】
本発明によれば、仕切り部材９の中央部に、ブラケット５の軸受ハウジング５ａの外周部に密着する送風ガイド９ｂを設けたので、冷却ファン８により吸引された空気は送風ガイド９ｂに沿って、方向を変えることなく冷却ファン８内に流入することができる。このため、従来、流れ方向を変えることによって生じていた損失を低減することができ、冷却風量を増加することができる。これにより、高い冷却効果が得られるため、温度上昇によるモータ２の劣化を防止することができ、長寿命の電動送風機を得ることができる。
【００１４】
また、仕切り部材９の吸込口９ａの内壁と送風ガイド９ｂの外壁との間に、複数のリブ９ｃを設けたので、吸引された空気はこのリブ９ｃにより整流されながら冷却ファン８の吸込口８ａに流入するため、さらに高風量を得ることができ、冷却効果を高めることができる。
なお、図４に示すように、断面矩形状のリブ９ｃの上下面９ｆ，９ｇをＲ形状にすることにより、より高い整流効果を得ることができる。
【００１５】
さらに、仕切り部材９に設けた送風ガイド９ｂは、ブラケット５の軸受ハウジング５ａの外周に密着して固定されているため、回転子４及び送風ファン７が高速で回転する際に発生する振動が、軸受ハウジング５ａからモータ２の外郭へ伝わるのを抑制することができるので、低振動の電動送風機を得ることができる。
【００１６】
【発明の効果】
本発明に係る電動送風機は、冷却ファンとモータ側を仕切る仕切り部材の吸込口の中央部に、モータフレームの開口部に固定されたブラケットの中央部に設けた軸受ハウジングの外周部に密着する送風ガイドを設けたので、冷却ファンにより吸引された空気は送風ガイドに沿って、方向を変えることなく冷却ファン内に流入することができるため、従来、流れ方向を変えることによって生じていた損失を低減することができ、冷却風量を増加することができる。これにより高い冷却効果が得られため温度上昇によるモータの劣化を防止することができ、長寿命の電動送風機を得ることができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る電動送風機の一部縦断面図である。
【図２】図１の要部の拡大図である。
【図３】図１の仕切り部材とブラケットとの関係を示す平面図である。
【図４】図３のＸ−Ｘ拡大断面図である。
【符号の説明】
１ モータフレーム、１ａ 通気孔、１ｂ 軸受ハウジング、２ モータ、５ブラケット、５ａ 軸受ハウジング、７ 送風ファン、８ 冷却ファン、９ 仕切り部材、９ａ 吸込口、９ｂ 送風ガイド、９ｃ リブ、１０ ケーシング、１２ ファンカバー。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric blower used for a vacuum cleaner or the like.
[0002]
[Prior art]
In this type of conventional electric blower, a stator fixed by a pair of brackets, a rotor provided in the stator and having an output shaft extending in the longitudinal direction from the bracket, and attached to the output shaft A rotating fan, an air guide attached to partition between the stator and the rotor and the rotating fan, and a plurality of air holes formed in an outer peripheral portion attached to cover the rotating fan and the air guide. In the electric blower composed of the fan case, a rotary fan for the blower whose intake port faces the outside of the electric blower and sucks the outside air, and a rotary fan for the cooling whose suction port faces the inside of the electric blower and sucks the air in the blower. Are arranged close to each other so that the wind discharged from each of the rotating fans is discharged from a common fan case outer peripheral hole. Document reference 1).
[0003]
[Patent Document 1]
JP-A-2002-31090 (page 3, FIG. 1)
[0004]
[Problems to be solved by the invention]
In the electric blower described in Patent Literature 1, when cooling air is sucked from the stator and the rotor side by the cooling rotary fan, a suction port of a partition member that separates the cooling fan from the stator and the rotor side is a bracket. Because the airflow path is adjacent to the bearing housing part provided in the center of the bracket, sufficient airflow is not secured, and the air flowing therethrough changes its direction along the shape of the bracket's bearing housing part while changing the suction port. As a result, there is a problem that a loss occurs, and a sufficient amount of air for cooling the motor cannot be obtained.
[0005]
The present invention has been made to solve the above problems, and provides a high-efficiency, long-life electric blower that improves cooling efficiency by reducing suction loss of cooling air for cooling a motor and the like. It is intended for that purpose.
[0006]
[Means for Solving the Problems]
The present invention relates to a motor frame having an opening at an upper portion, a ventilation hole at a side surface, and a bearing housing provided at a center portion of a bottom portion, a bracket fixed to an opening side of the motor frame and provided with a bearing housing at a center portion. A motor comprising a rotor and a stator supported by the motor frame and a bearing housing of a bracket; a blower fan fixed to a shaft of the motor above the bracket to discharge sucked air from a peripheral edge; and a blower fan. A cooling fan fixed to the motor side and discharging the air sucked from the ventilation hole of the motor frame from the peripheral edge, and a partition member provided with a suction port at a central portion to partition the cooling fan and the motor side. A blower guide closely attached to an outer peripheral portion of a bearing housing provided on the bracket at a central portion of a suction port of the partition member; It is those provided.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
1 is a partial longitudinal sectional view of an electric blower according to one embodiment of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a plan view showing a relationship between a partition member and a bracket of FIG. It is.
In the figure, a motor frame 1 has an opening at the top, a plurality of ventilation holes 1a at side surfaces, a concave bearing housing 1b at the bottom center, and a rotor 3 rotating at high speed with a stator 3 inside. 4 is provided.
[0008]
The bracket 5 fixed to the upper opening of the motor frame 1 has a bearing housing 5a at the center, a first ventilation port 5b provided around the bearing housing 5a, and a motor frame at the outer periphery of the ventilation hole 5b. A plurality of second ventilation holes 5c are provided on the outer periphery of one. In the motor 2, bearings 6 provided on both ends of the shaft 4 a of the rotor 4 are supported by bearing housings 1 a and 5 a of the motor frame 1 and the bracket 5. Further, the blower fan 7 having the suction port 7 a in the center is fixed to the shaft 4 a of the rotor 4 and rotates together with the rotor 4. Reference numeral 8 denotes a cooling fan having a suction port 8a at the center and fixed to the rear side (motor 2 side) of the blower fan 7.
[0009]
The partition member 9 for separating the motor 2 and the cooling fan 7 has a suction port 9a having a diameter substantially equal to the suction port 8a of the cooling fan 8, and a central portion of the suction port 9a An air guide 9b is provided which is in close contact with the partition member 9 and is integrally connected to the partition member 9 by a plurality of ribs 9c. The bracket 5 has a cylindrical leg 9d that separates the first ventilation port 5b and the second ventilation port 5c. On the back side of the leg 9d, air discharged from the cooling fan 8 is provided. , A plurality of blades 9e for guiding to the second ventilation port 5c of the bracket 5 are provided.
[0010]
A casing 10 that separates the blower fan 7 side and the cooling fan 8 side comes into contact with the upper surface of the blade 9e of the partition member 9, is fixed by being pressed into the outer peripheral portion of the bracket 5, and has an opening 10a at the center. Is provided. Reference numeral 11 denotes a guide blade fixed to the upper surface of the outer peripheral portion of the casing 10 and guides the air discharged from the blower fan 7 in the outer peripheral direction. The fan cover 12 that covers the blower fan 7 and the guide blades 11 has a suction port 12a in the center, and a plurality of exhaust holes 12b on the side surface for discharging air guided outward from the guide blades 11 to the outside. Have been.
[0011]
In the electric blower configured as described above, when the motor 2 is driven, the blower fan 7 and the cooling fan 8 attached to the shaft 4a of the rotor 4 rotate to suck outside air. Then, the air sucked from the suction port 7a of the blower fan 7 passes through the inside of the blower fan 7 as shown by an arrow A in the figure, is rectified by the guide vanes 11 and recovers the pressure, and the side of the fan cover 12 is recovered. Is discharged to the outside through an exhaust port 12b provided at the bottom.
[0012]
On the other hand, the air sucked by the cooling fan 8 flows in from the vent 1b of the motor frame 1 as shown by an arrow B in the figure, and blows air from the partition member 9 while cooling the stator 3, the rotor 4 and the like. The air flows into the suction port 8a of the cooling fan 8 from the suction port 9a provided on the outer circumference of the guide 9b, flows out of the outer circumference through the inside of the cooling fan 8, and is guided by the blade 9e to the second ventilation port of the bracket 5. 5c is discharged outside.
[0013]
According to the present invention, the air guide 9b is provided at the center of the partition member 9 in close contact with the outer peripheral portion of the bearing housing 5a of the bracket 5, so that the air sucked by the cooling fan 8 flows along the air guide 9b It can flow into the cooling fan 8 without changing the direction. For this reason, it is possible to reduce the loss that has conventionally been caused by changing the flow direction, and it is possible to increase the amount of cooling air. As a result, a high cooling effect is obtained, so that deterioration of the motor 2 due to temperature rise can be prevented, and a long-life electric blower can be obtained.
[0014]
Further, since a plurality of ribs 9c are provided between the inner wall of the suction port 9a of the partition member 9 and the outer wall of the blower guide 9b, the sucked air is rectified by the ribs 9c and the suction port 8a of the cooling fan 8 is formed. Therefore, a higher air volume can be obtained and the cooling effect can be enhanced.
As shown in FIG. 4, a higher rectifying effect can be obtained by forming the upper and lower surfaces 9f and 9g of the rib 9c having a rectangular cross section in an R shape.
[0015]
Further, since the blower guide 9b provided on the partition member 9 is fixed in close contact with the outer periphery of the bearing housing 5a of the bracket 5, the vibration generated when the rotor 4 and the blower fan 7 rotate at a high speed, Since transmission from the bearing housing 5a to the outer periphery of the motor 2 can be suppressed, a low-vibration electric blower can be obtained.
[0016]
【The invention's effect】
The electric blower according to the present invention is a blower that closely contacts an outer peripheral portion of a bearing housing provided at a central portion of a bracket fixed to an opening of a motor frame at a central portion of a suction port of a partition member that separates a cooling fan and a motor side. With the guide, the air sucked by the cooling fan can flow into the cooling fan along the blower guide without changing the direction, thus reducing the loss previously caused by changing the flow direction. And the amount of cooling air can be increased. As a result, a high cooling effect is obtained, so that deterioration of the motor due to temperature rise can be prevented, and a long-life electric blower can be obtained.
[Brief description of the drawings]
FIG. 1 is a partial vertical sectional view of an electric blower according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a plan view showing a relationship between a partition member and a bracket in FIG. 1;
FIG. 4 is an enlarged sectional view taken along line XX of FIG. 3;
[Explanation of symbols]
Reference Signs List 1 motor frame, 1a ventilation hole, 1b bearing housing, 2 motor, 5 bracket, 5a bearing housing, 7 blower fan, 8 cooling fan, 9 partition member, 9a suction port, 9b blower guide, 9c rib, 10 casing, 12 fan cover.

Claims (2)

上部が開口され側面に通気孔を有し底部中央部に軸受ハウジングが設けられたモータフレームと、該モータフレームの開口部側に固定され中央部に軸受ハウジングが設けられたブラケットと、前記モータフレームとブラケットの軸受ハウジングに支持された回転子及び固定子とからなるモータと、前記ブラケットの上方においてモータの軸に固定され吸引した空気を周縁から排出する送風ファンと、該送風ファンのモータ側に固定され前記モータフレームの通気孔から吸引した空気を周縁から排出する冷却ファンと、中央部に吸込口が設けられ前記冷却ファンとモータ側を仕切る仕切り部材とを備えた電動送風機において、
前記仕切り部材の吸込口の中央部に前記ブラケットに設けた軸受ハウジングの外周部に密着する送風ガイドを設けたことを特徴とする電動送風機。A motor frame having an opening at the top, a ventilation hole at the side surface, and a bearing housing provided at the bottom center, a bracket fixed to the opening of the motor frame and provided with a bearing housing at the center, and the motor frame A motor comprising a rotor and a stator supported by a bearing housing of a bracket, a blower fan fixed to a shaft of the motor above the bracket and discharging suctioned air from a peripheral edge, and a motor side of the blower fan. A cooling fan that is fixed and discharges air sucked from the ventilation hole of the motor frame from the peripheral edge, and an electric blower including a partition member that is provided with a suction port at a central portion and partitions the cooling fan and the motor side,
An electric blower, wherein a blower guide is provided at the center of the suction port of the partition member so as to be in close contact with the outer periphery of a bearing housing provided on the bracket. 前記仕切り部材の吸込口と送風ガイドとの間に両者を連結する複数のリブを設けたことを特徴とする請求項１記載の電動送風機。The electric blower according to claim 1, wherein a plurality of ribs are provided between the suction port of the partition member and the blower guide to connect the two.
JP2002364593A 2002-12-17 2002-12-17 Electric blower Expired - Fee Related JP4029333B2 (en)

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JP2002364593A JP4029333B2 (en) 2002-12-17 2002-12-17 Electric blower
KR10-2003-0005526A KR100496552B1 (en) 2002-12-17 2003-01-28 Electric ventilator
CNB03106728XA CN100378340C (en) 2002-12-17 2003-02-27 Electric blowing-in machine

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CN1900616B (en) * 2005-07-19 2010-12-22 乐金电子(天津)电器有限公司 Air blower
CN100538084C (en) * 2007-01-24 2009-09-09 建准电机工业股份有限公司 The reduction noise structure of fan case seat
JP4431602B2 (en) * 2007-07-10 2010-03-17 日立アプライアンス株式会社 Electric blower and vacuum cleaner equipped with the same
US10638900B2 (en) * 2015-09-10 2020-05-05 Nidec Corporation Air blowing device and vacuum cleaner

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JPH08277800A (en) * 1995-04-05 1996-10-22 Toho Eng Kk Centrifugal blower
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CN100378340C (en) 2008-04-02
KR100496552B1 (en) 2005-06-22

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