JP2005133595A - Electric blower - Google Patents

Electric blower Download PDF

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Publication number
JP2005133595A
JP2005133595A JP2003368480A JP2003368480A JP2005133595A JP 2005133595 A JP2005133595 A JP 2005133595A JP 2003368480 A JP2003368480 A JP 2003368480A JP 2003368480 A JP2003368480 A JP 2003368480A JP 2005133595 A JP2005133595 A JP 2005133595A
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JP
Japan
Prior art keywords
commutator
rotor
electric
case
stator
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.)
Pending
Application number
JP2003368480A
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Japanese (ja)
Inventor
Katsuhide Kato
勝英 加藤
Original Assignee
Toshiba Tec Corp
東芝テック株式会社
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 Toshiba Tec Corp, 東芝テック株式会社 filed Critical Toshiba Tec Corp
Priority to JP2003368480A priority Critical patent/JP2005133595A/en
Publication of JP2005133595A publication Critical patent/JP2005133595A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide an electric blower capable of sufficiently cooling a commutator even when the amount of exhaust air guided into a case is reduced.
An electric unit comprising a stator 3 and a rotor 4 provided rotatably with respect to the stator 3, and a centrifugal fan fixed to one end of an output shaft 5 provided on the rotor 4. 6, a commutator 10 provided at the other end of the output shaft 5 for supplying current to the rotor 4, and a cylindrical case 2 that covers the electric part and guides exhaust air from the centrifugal fan 6 to the electric part A carbon brush 11 that contacts the commutator 10, and a thermo protector 20 that is connected in series to the carbon brush 11 and that turns off the current when it is detected that the current flowing through the commutator is an overcurrent; The holding part 15 is provided with a holding part 15 that holds the thermoprotector 20, and the holding part 15 is provided with an inclined surface 16 that guides the exhaust air guided in the cylindrical case 2 to the commutator 10.
[Selection] Figure 1

Description

  The present invention has an electric part composed of a stator and a rotor provided rotatably with respect to the stator, and a fan fixed to one end of an output shaft provided in the rotor, The present invention relates to an electric blower configured to guide exhaust air from the fan to an electric part.
  Conventionally, a stator, a rotor provided rotatably with respect to the stator, a fan fixed to one end of an output shaft provided on the rotor, and provided on the other end of the output shaft There is known an electric blower including a commutator for supplying current to a rotor and a carbon brush or the like that contacts the commutator (see Patent Document 1).
In such an electric blower, the stator, the rotor and the like are housed in a cylindrical case, and the exhaust air from the fan is guided into the case to cool the rotor, the stator and the carbon brush. It is like that.
Japanese Patent Laid-Open No. 2001-295792
  However, in such an electric blower, the exhaust air is simply sent into the case, so that the commutator with which the carbon brush contacts cannot be sufficiently cooled. In particular, when an electric blower is used in a vacuum cleaner, when the dust collecting filter is clogged, the exhaust air flowing in the case becomes slight, and as a result, the commutator cannot be cooled sufficiently. There was a problem that.
  An object of the present invention is to provide an electric blower that can sufficiently cool a commutator even when the amount of exhaust air guided into a case is reduced.
The invention according to claim 1 is an electric part composed of a stator and a rotor provided rotatably with respect to the stator, a fan fixed to one end of an output shaft provided in the rotor, A commutator provided at the other end of the output shaft for supplying a current to the rotor, a case that covers the electric part and guides exhaust air from the fan to the electric part, and contacts the commutator A carbon brush, a thermo protector that is provided in series with the carbon brush and the commutator and that turns off the current when it is detected that the current flowing through the commutator is an overcurrent, and holds the thermo protector An electric blower comprising a holding part,
The holding portion is provided with a guide portion for guiding the exhaust air guided in the case to the commutator.
  According to this invention, since the guide portion for guiding the exhaust air to the commutator is provided in the holding portion, the commutator can be sufficiently cooled even if the amount of exhaust air guided into the case is reduced. .
  Embodiments of an electric blower according to the present invention will be described below with reference to the drawings.
  An electric blower 1 shown in FIG. 1 is used, for example, in a vacuum cleaner, and has a cylindrical tube case (case) 2, a stator 3 fixed in the tube case 2, and the stator 3. And a rotor 4 and the like that are rotatably provided therein. The stator 3 and the rotor 4 constitute an electric part, and the electric part is covered with the cylindrical case 2. That is, the electric part is provided in the cylindrical case 2. A plurality of exhaust holes 2A are formed in the upper part (in FIG. 1) of the cylindrical case 2.
  A centrifugal fan (fan) 6 is attached to one end of the output shaft 5 provided in the rotor 4, and the centrifugal fan 6 is covered with a fan cover 7. The fan cover 7 is attached to one end of the cylindrical case 2. An air inlet 7 </ b> A is formed in the center of the fan cover 7, and a rectifying plate 8 is provided in the fan cover 7. The centrifugal fan 6 rotates to suck air from the air inlet 7A and send it into the cylindrical case 2 through the rectifying plate 8. This air (exhaust air) flows in the cylindrical case 2 as indicated by the arrow direction.
  The other end of the output shaft 5 of the rotor 4 is provided with a commutator 10 for supplying a current to the coil 4 </ b> A of the rotor 4. The commutator 10 has tip portions of a pair of carbon brushes 11. In contact. The carbon brush 11 is held by a brush holder 12, and this brush holder 12 is mounted on a holder receiving portion 13 provided on the cylindrical case 2 as shown in FIGS.
  A pair of holder receivers 13 are provided at opposing positions, and are provided along the radial direction of the output shaft 5. A holding portion 15 that holds the thermoprotector 20 is integrally formed below each holder receiving portion 13 (in FIG. 3).
  The holding portion 15 extends along the radial direction of the output shaft 5 and includes side wall portions 15A and 15B facing each other along the radial direction. The side wall portion 15A is located on the output shaft 5 side and enters the inner side from the outer diameter of the rotor 4, and the side wall portion 15B is located on the cylindrical case 2 side.
  And the inclined surface (guide part) 16 which approaches the output-shaft 5 side (center axis line side of the electric blower 1) is formed in the side wall part 15A as it goes to the other end side (upper side in FIG. 4). The inclined surface 16 is located inside the outer diameter of the rotor 4.
  The thermo protector 20 is for preventing an overcurrent flowing in the electric part. As shown in FIGS. 5 and 6, a metal case 21 whose upper surface (in FIG. 5) is opened, and the inside of the metal case 21 And a bimetal 22 and the like provided on the board. One end of the bimetal 22 is fixed to the metal case 21, and a movable contact 23 is provided on the other end of the bimetal 22.
  A metal plate 25 is attached to the upper surface opening 21A of the metal case 21 via an insulating sheet 24, and a fixed contact 26 provided on the metal plate 25 projects into the metal case 21 via a hole 24A of the insulating sheet 24. ing. The movable contact 23 of the bimetal 22 is in contact with the fixed contact 26, and when the temperature of the bimetal 22 exceeds a predetermined temperature (about 130 ° C.) due to overcurrent flowing through the bimetal 22, the movable contact 23 is moved from the fixed contact 26. It is supposed to leave.
  The metal plate 25 is in contact with the brush holder 12 of the carbon brush 11, and one end of the bimetal 22 is electrically connected to a terminal 28 provided on the terminal block 27. 7, the coil 3A of the stator 3, the thermo protector 20, the carbon brush 11, the commutator 10 of the rotor 4, the carbon brush 11, and the coil 3B of the stator 3 are electrically connected. Are connected in series to form a series circuit. When the thermoprotector 20 reaches a predetermined temperature or more, the movable contact 23 is separated from the fixed contact 26, so that the series circuit is turned off and the rotation of the rotor 4 is stopped.
[Operation]
Next, operation | movement of the electric blower 1 comprised as mentioned above is demonstrated.
  When the fan 6 is rotated by the rotation of the rotor 4 and the output shaft 5, air is sucked from the air inlet 7A of the fan cover 7, and the sucked air flows into the cylindrical case 2 as shown by the solid line arrow. . The air flowing into the cylindrical case 2 flows toward the holding portion 15 holding the thermoprotector 20 after cooling the electric portion.
  The air toward the holding unit 15 is guided to the commutator 10 side by the inclined surface 16 of the holding unit 15, and as a result, the commutator 10 is sufficiently cooled. In addition, since the inclined surface 16 is positioned on the inner side of the outer diameter of the rotor 4, a sufficient amount of air can be secured to cool the commutator 10, and the commutator 10 can be further cooled. The air that has cooled the commutator 10 is exhausted from the exhaust hole 2 </ b> A of the cylindrical case 2 to the outside.
  As described above, the air directed toward the holding unit 15 is guided by the inclined surface 16 of the holding unit 15 and flows toward the commutator 10. For example, the dust collecting filter of the electric vacuum cleaner is clogged to cause a fan. Even if the amount of air sucked into the air inlet 7A of the cover 7 is reduced, the commutator 10 can be sufficiently cooled, and therefore the malfunction of the thermo protector 20 due to the temperature rise of the commutator 10 is prevented by clogging. can do.
It is the semi-sectional view which showed the structure of the electric blower which concerns on this invention. It is the top view which showed the cylinder case of the electric blower shown in FIG. It is sectional drawing of the cylinder case shown in FIG. It is the elements on larger scale which showed a part of electric blower of FIG. It is the longitudinal cross-sectional view which showed the structure of the thermo protector. It is the cross-sectional view which showed the structure of the thermo protector. It is the circuit diagram which showed the circuit of the electric blower.
Explanation of symbols
1 Electric blower 2 Tube case (case)
3 Stator 4 Rotor 5 Output shaft 6 Centrifugal fan (fan)
DESCRIPTION OF SYMBOLS 10 Commutator 11 Carbon brush 15 Holding part 16 Inclined surface 20 Thermo protector

Claims (2)

  1. An electric part composed of a stator and a rotor provided rotatably with respect to the stator, a fan fixed to one end of an output shaft provided in the rotor, and a second end of the output shaft A commutator provided to supply current to the rotor; a case that covers the electric part and guides exhaust air from the fan to the electric part; a carbon brush that contacts the commutator; and the carbon brush And a thermo protector that is provided in series with the commutator and that turns off the current when it is detected that the current flowing through the commutator is an overcurrent, and a holding unit that holds the thermo protector. An electric blower,
    An electric blower characterized in that a guide portion for guiding exhaust air guided in the case to the commutator is provided in the holding portion.
  2.   The electric blower according to claim 1, wherein the guide portion is provided at a position inside the outer diameter of the rotor.
JP2003368480A 2003-10-29 2003-10-29 Electric blower Pending JP2005133595A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003368480A JP2005133595A (en) 2003-10-29 2003-10-29 Electric blower

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003368480A JP2005133595A (en) 2003-10-29 2003-10-29 Electric blower

Publications (1)

Publication Number Publication Date
JP2005133595A true JP2005133595A (en) 2005-05-26

Family

ID=34646128

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003368480A Pending JP2005133595A (en) 2003-10-29 2003-10-29 Electric blower

Country Status (1)

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JP (1) JP2005133595A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101994707B (en) * 2009-08-24 2012-07-18 神基科技股份有限公司 Airflow generation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101994707B (en) * 2009-08-24 2012-07-18 神基科技股份有限公司 Airflow generation device

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