JPH10252694A - Motor-driven air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve air blowing efficiency, and reduce a noise by constituting a motor-driven air blower of an electric motor, fans and diffuser, providing a volute wall to divide a wind from the fans and an exhaust passage in the diffuser, and forming the volute wall of a metallic piece. SOLUTION: An electric motor to house a stator and a rotor rotatably pivots both ends of a rotary shaft of the rotor by a ball bearing. A diffuser 14 is constituted of a synthetic resin base part 16 on which fans are placed at intervals, guide blades 18 to form an exhaust passage 17 by being integrally formed on its reverse and a metallic volute wall 19 to surround an outer peripheral part of obverse side fan of the base part 16. The volute wall 19 is formed by inserting a metallic piece 20 by thinly forming one end part positioned on the outer peripheral side of the fans and the other end part positioned on the outer peripheral side of the base part 16 into the base part 16. Therefore, air blowing efficiency can be improved, and since a vortex flow can be prevented, a noise can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric blower used for a vacuum cleaner or the like.

[0002]

2. Description of the Related Art Conventionally, an electric blower built in a vacuum cleaner or the like is composed of an electric motor section having a stator and a rotor, and a fan section having a centrifugal fan and a diffuser mounted on a rotating shaft of the rotor. I have.

[0003] When the electric blower is driven, the wind blown by the fan rotating with the rotation of the rotor is guided by a volute wall formed on the side surface of the diffuser fan, and is guided to an exhaust passage formed on the back surface of the diffuser. It is being led.

[0004] Since these diffusers are formed of synthetic resin, the volute wall must be thickened to some extent due to the problem of the strength of the volute wall. At the tip of the volute wall, the diffuser is fed by a centrifugal fan. There is a drawback in that a swirling air flow is generated, resulting in a loss of blowing efficiency and noise.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide an electric blower capable of improving blowing efficiency.

[0006]

SUMMARY OF THE INVENTION The present invention comprises an electric motor having a stator and a rotor therein, and a blower having a fan and a diffuser. It is characterized by comprising a volute wall to be divided and an exhaust passage formed on the back surface of the diffuser, wherein the volute wall is formed of a metal piece.

Further, the present invention comprises an electric motor having a stator and a rotor therein, and a blower having a fan and a diffuser, wherein the diffuser has a volute wall formed to face the outer periphery of the fan and dividing the wind from the fan. An exhaust passage formed on the back surface of the diffuser, wherein the volute wall is formed of a metal piece, and the volute wall is integrally formed with a diffuser made of synthetic resin.

Further, the present invention comprises a motor having a stator and a rotor therein, and a blower having a fan and a diffuser, wherein the diffuser has a volute wall formed to face the outer periphery of the fan and dividing the wind from the fan. An exhaust passage formed on the back surface of the diffuser, wherein the volute wall is formed of a metal piece, and a hole is formed at a lower end of the metal piece, and the volute wall is integrally formed with a synthetic resin diffuser. It is characterized by having done.

Further, the present invention comprises a motor having a stator and a rotor therein, and a blower having a fan and a diffuser, wherein the diffuser has a volute wall formed to face the outer periphery of the fan and dividing the wind from the fan. An exhaust passage formed on the back surface of the diffuser, the volute wall is formed of a metal piece having a thin outer peripheral end of the fan, and the volute wall is integrally formed with a synthetic resin diffuser. It is characterized by the following.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes an electric blower, which comprises an electric motor 2 and a blower 3.

First, the electric motor 2 will be described. Reference numeral 4 denotes a bottomed cylindrical bracket having an open end, on which a stator 5 and a rotor 6 are housed. ing. Reference numeral 8 denotes a brush holding portion fixed to the bracket 4, and a carbon brush 9 held inside is elastically provided on the outer peripheral surface of the commutator 10 of the rotor 6.

Reference numerals 11 denote ball bearings which are press-fitted and fixed to the bottom surface of the bracket 4 and the center of the end plate 7, respectively, and rotatably support both ends of a rotating shaft 12 of the rotor 6 respectively.
13 is provided between the ball bearing 11 of the rotating shaft 12 and a fan 22 described later, and the fan 22 and the ball bearing
11 is a sleeve that serves as an interval maintaining unit that maintains an interval between the sleeve 11.

Next, the blower 3 will be described.

Numeral 14 denotes a diffuser fixed to the end plate 7 with screws 15, and a synthetic resin base 16 on which fans 22, which will be described later, are mounted at intervals, and a back surface of the base 16 (the electric motor 3).
Guide vanes 18 which are integrally formed on the
And a metal volute wall 19 disposed on the front side of the base 16 (toward a fan 22 to be described later) and surrounding an outer peripheral portion of the fan 22 to be described later.

As shown in FIG. 2, the volute wall 19 is formed by narrowing both ends, that is, one end located on the outer peripheral side of a fan 22 described later and the other end located on the outer peripheral side of the base 16. The piece 20 is formed by insert molding the base 16. Reference numeral 21 denotes a hole formed in a lower portion of the metal piece 20, that is, a portion to be fitted into the base 16, and
When the base 20 is insert-molded into the base 16, the resin on both sides of the metal piece 20 is connected via the holes 21, so that the strength of the diffuser does not decrease.

Reference numeral 22 denotes a fan fixed to the rotating shaft 12 of the rotor 6 extending through the diffuser 14. The front shroud 24, the rear shroud 25 and the front and rear shroud 25 have an air inlet 23 at the center of the fan 22. It comprises a plurality of blades 26 fixed between the shrouds 24,25.

Reference numeral 27 denotes the diffuser 14 and the fan 22
The fan cover 27 is press-fitted and fixed to the end plate 7, and an intake port 28 is formed at a substantially central portion of the fan cover 27.

According to the above configuration, since the volute wall 19 is formed of the metal piece 20, one end of the metal piece 20, that is, the air blown out by the fan 22 is compared with the case where the volute wall is integrally formed of resin. Can be formed sharply, the airflow loss of the air sent out by the fan 22 can be reduced, the blowing efficiency can be improved, and the vortex at the entrance of the volute wall 19 can be prevented. Can be reduced.

When the volute wall is formed of resin, it is conceivable to perform post-processing in order to sharpen the tip portion. However, if the thickness of the resin is too small, the strength is reduced. By forming the volute wall with the metal pieces 20 as in the present embodiment, it is possible to improve the strength while making the volute wall thin.

Further, when the volute wall 19 is integrally formed of resin, the height dimension of the volute wall is not stable, for example, the sinking after molding causes the volute wall to be deformed and lowered.
Although a gap may be generated between the fan cover 27 and the volute wall 19, the height dimension of the volute wall 19 can be stabilized by forming the volute wall 19 with a metal piece 20, and the fan cover The sealing efficiency of 27 can be improved, and the blowing efficiency can be improved.

Further, since the hole 21 is formed in the lower portion of the metal piece 20, when the metal piece 20 is formed integrally with the base 16 and the guide blade 18, the resin on both sides of the metal piece 20 passes through the hole 20. Because of the connection, the strength of the diffuser 14 does not decrease.

[0023]

According to the first aspect of the present invention, since the volute wall is made of a metal piece, the volute wall can be made thinner, so that the air flow loss of the air sent out by the fan can be reduced. In addition, the blowing efficiency can be improved, and eddy currents at the entrance of the volute wall can be prevented, so that noise can be reduced.

According to the second aspect of the present invention, since the volute wall is made of a metal piece, the volute wall can be made thinner, so that the air flow loss of the air sent out by the fan can be reduced, and Efficiency can be improved and eddy currents at the entrance of the volute wall can be prevented, so that noise can be reduced.

In addition, by integrally molding the metal piece with the diffuser made of synthetic resin, the height of the volute wall can be stabilized, and the sealing performance between the volute wall and the fan cover can be improved to improve the blowing efficiency. Can be improved.

According to the third aspect of the present invention, since the volute wall is made of a metal piece, the volute wall can be made thinner, so that the airflow loss of the air sent out by the fan can be reduced, and Efficiency can be improved and eddy currents at the entrance of the volute wall can be prevented, so that noise can be reduced.

In addition, since the hole is formed in the lower part of the metal piece, when the metal piece is integrally formed with the diffuser, the resin on both sides of the metal piece is connected through the hole, thereby preventing the strength of the diffuser from being reduced. it can.

According to the fourth aspect of the present invention, since the volute wall is made of a metal piece, the volute wall can be made thinner, so that the air flow loss of the air sent out by the fan can be reduced, and Efficiency can be improved, and eddy at the entrance of the volute wall can be further prevented by forming the end of the metal piece on the outer peripheral side of the fan to be thin, so that noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a diffuser showing an embodiment of the present invention.

FIG. 2 is a plan view of a metal piece constituting the volute wall.

FIG. 3 is an enlarged view of an end portion of the metal piece.

FIG. 4 is a partially cutaway view of the electric blower.

[Explanation of symbols]

 2 Blower 3 Motor 5 Stator 6 Rotor 14 Diffuser 17 Exhaust passage 19 Volute wall 20 Metal piece 22 Fan

Claims (4)

[Claims] 1. A volute wall comprising a motor having a stator and a rotor therein, and a blower having a fan and a diffuser, wherein the volute wall is formed on the diffuser so as to face the outer periphery of the fan and divides the wind from the fan, and the diffuser An electric blower, comprising: an exhaust passage formed on a back surface; and wherein the volute wall is formed of a metal piece. 2. A diffuser comprising: a motor having a stator and a rotor therein; and a blower having a fan and a diffuser, wherein the diffuser is formed to face the outer periphery of the fan and divides the wind from the fan; An electric blower comprising: an exhaust passage formed on a back surface; wherein the volute wall is formed of a metal piece; and the volute wall is integrally formed with a synthetic resin diffuser. 3. A volute wall comprising a motor having a stator and a rotor therein, and a blower having a fan and a diffuser, wherein the volute wall is formed on the diffuser so as to face the outer periphery of the fan and divides the wind from the fan, and the diffuser An exhaust passage formed on the back surface, wherein the volute wall is formed of a metal piece, a hole is formed at the lower end of the metal piece, and the volute wall is formed integrally with a synthetic resin diffuser. Characterized electric blower. 4. A volute wall comprising a motor having a stator and a rotor therein, and a fan having a fan and a diffuser, wherein the volute wall is formed on the diffuser so as to face the outer periphery of the fan and divides the wind from the fan, and the diffuser An exhaust passage formed on the back surface, wherein the volute wall is formed of a metal piece having a thin outer peripheral end of the fan, and the volute wall is integrally formed with a synthetic resin diffuser. And electric blower.