JPH11148484A - Electric blower - Google Patents

Abstract

(57) [Problem] To provide an electric blower that can reduce the number of parts to be assembled and improve the assembling work while maintaining the dust-proof and waterproof effects, and can also improve the cooling efficiency and the blowing efficiency. provide. A case end plate (22) is attached to one end opening (21a) of a case main body (21), and a stator unit (32) having a stator coil (31) is housed in the case main body (21) and mounted on a bearing mounting part (21b) and a bearing mounting part (22a). The rotor shaft 28 of the rotor unit 33 located inside the stator unit 32 is supported by the bearings 26 and 27 provided, and a centrifugal fan 29 is fixed to an end of the rotor shaft 28 that has penetrated the bearing mounting portion 22a. One end of the fan cover 30 is attached to the opening 21 a so as to cover the fan 29 and the case end face plate 22. The stator coil 31 and the electric system unit are covered with the resin mold 44, and the exposed part of the bearing 26 is covered with the sealing material 36. ing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner, and more particularly to an electric blower mounted on a wet and dry type vacuum cleaner.

[0002]

2. Description of the Related Art In recent years, a so-called wet and dry type vacuum cleaner has been known which is capable of sucking moisture as well as dust on the floor surface.

FIG. 3 shows an electric blower mounted on such a wet and dry type vacuum cleaner.

In FIG. 3, an electric blower 1 has a cylindrical case body 2 made of metal, and bearings 3 and 4 mounted on the case body 2.
A rotating shaft 5 whose both ends are rotatably supported via a shaft; a blower fan 6 fixed to one end of the rotating shaft 5; a blower fan cover 7 that covers the blower fan 6; The inner cylinder 9 fixed to the case main body 2 so as to form the air passage 8 in cooperation with the inner wall of the main body 2, the stator unit 11 fixed to the inner cylinder 9 via the cover 10, and the rotating shaft 5. It includes a fixed rotor unit 12 and a circuit board 15 having a Hall element 14 for monitoring the heating temperature of the stator coil 13 of the stator unit 11.

[0005] When the blower fan 6 rotates with the rotation of the rotating shaft 5, an inlet 7 a formed in the blower fan cover 7 is formed.
Then, the air is taken in, and the air passes through the air passage 8 via the blower fan 6 and the blower fan cover 7 to generate intake air for sucking dust and water droplets. Further, the stator 11 is cooled by passing through the air passage 8.

At this time, the bearings 3, 4 and the stator coil 1
3. Since the circuit board 15 including the Hall element 14 is isolated from the air passage 8 by the inner cylinder 9 and the cover 10, adhesion of dust and water droplets is prevented.

[0007]

By the way, in the electric blower 1 configured as described above, in addition to the bearings 3 and 4,
It is necessary to provide the inner cylinder 9 and the cover 10 to supply power to the stator 11 such as the circuit board 15 including the stator coil 13 and the Hall element 14 and to protect an electric system unit for electric control from dust and water droplets. Was.

The inner cylinder 9 and the cover 10 are formed in consideration of the attachment of the rotating shaft 5 to which the rotor unit 12 is fixed to the case body 2 and the arrangement of the stator unit 11 facing the rotor unit 12. Not only must a complicated structure be adopted in which the cover 10 is interposed and the cover 10 is interposed therebetween, but also the assembly of the rotating shaft 5 and the stator unit 11 becomes difficult due to the presence of the inner cylinder 9 and the cover 10. Had occurred.

Furthermore, since the inner cylinder 9 and the cover 10 cover almost all but a part of the stator unit 11, there has been a problem that the cooling efficiency and the air blowing efficiency of the stator unit 11 are reduced.

The present invention has been made in view of the above circumstances, and it is possible to reduce the number of parts to be assembled and improve the work of assembling while maintaining the dust-proof and waterproof effects, and furthermore, the cooling efficiency and the blowing efficiency It is an object of the present invention to provide an electric blower that can improve the performance.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention according to a first aspect of the present invention is directed to a case body having a bottomed cylindrical shape, and a bearing mounting portion which is attached to an opening of one end of the case body and is provided at a central portion. A motor case consisting of a case end plate having a stator unit having a stator coil and housed in the case body; an electric system unit for supplying power to the stator unit and performing electrical control; A rotor shaft rotatably supported by bearings respectively mounted on a bearing mounting portion formed on a bottom portion and the bearing mounting portion formed on the case end face plate, and disposed inside the stator unit; Rotor unit, a centrifugal fan fixed to the end of the rotor shaft that penetrates the bearing mounting portion of the case end face plate, An electric fan provided with a fan cover attached to one end opening of the case main body so as to cover the case end plate, wherein the stator coil and the electric system unit are covered with a resin mold and an exposed portion of the bearing is provided. Is covered with a sealing material.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the electric blower of the present invention will be described with reference to the drawings.

In FIG. 1, an electric blower 20 includes a metal motor case 23 comprising a substantially bottomed cylindrical case body 21 and a case end plate 22 closing one end opening 21a of the case body 21; A resin air passage partition 25 mounted on the face plate 22 via screws 24, and a bearing mounting portion 2 formed on the case body 21 and the case end face plate 22.
Bearings 26 and 27 fitted to the bearings 1b and 22a, and the bearing 2
Rotor shaft 28 rotatably supported at both ends by 6, 27
And a centrifugal fan 29 fixed to one end of the rotor shaft 28
And a blower fan cover 30 formed on the case body 21 so as to cover the centrifugal fan 29 while forming the intake port 30a at the center and a stator unit 32 around which the stator coil 31 is wound, and the stator unit 32. A rotor unit 33 fixed to the rotor shaft 28 as described above,
A circuit board 34 for supplying power to the stator coil 31 and controlling the power is provided.

A plurality of exhaust ports 21c are formed on the peripheral wall and the bottom wall of the case body 21. Also, the case body 21
The stator unit 32 and the circuit board 34 are fixed to the inner wall of the substrate. The stator unit 32 has a part fixed to the inner wall of the case main body 21 so as to form the exhaust port 2.
An air passage 35 communicating with 1c is secured in the motor case 23.

A plurality of openings or slits (not shown) are formed in the case end plate 22 and the air passage partitioning body 25 (not shown), whereby the air inlet 30a and the air passage 35 are communicated.

The inner and outer peripheral surfaces and one side surface of the bearing 27
Since it is in close contact with the case end plate 22 or the rotor shaft 28, dustproof and waterproof properties are secured. In addition, wind path 3
The other surface located on the fifth side has no dustproof / waterproof property when exposed to the air passage 35, and therefore, as shown in FIG. 2, a sealing material 36 such as Gore-Tex (registered trademark) is provided. ing. In FIG. 2, reference numeral 37 denotes a bearing holding member, 38 denotes a sleeve, and 39 denotes a C-ring.

To the circuit board 34, one ends of a plurality of wiring cords 40 connected to a power supply section of the vacuum cleaner main body for supplying power to the stator coil 31 are connected.
An intermediate portion of the wiring cord 40 is protected by a tube 41, and a connector 42 for connecting to the above-described power supply unit is provided at the other end of the wiring cord 40. Further, the circuit board 34 is provided with electronic control components such as a Hall element 43 for preventing burnout by monitoring the heating state of the stator coil 31.

On the other hand, the stator unit 32 and the circuit board 3
4 means that at least the stator coil 31 and its surroundings, as well as electronic control components and wiring connection parts, in particular, an electric system unit required to ensure waterproofness is covered with a resin mold 44 such as urethane. The unit 32 and the circuit board 34 are integrally unitized.

In the above configuration, the electric blower 20 is
After the stator unit 32 and the circuit board 34 previously unitized by the resin mold 44 are mounted on the case main body 21, the rotor shaft 28 to which the rotor unit 33 is fixed is mounted on the case main body 21 while the one end is opened by the case end face plate 22. The part 21a is closed, and the case main body 21 and the case end face plate 22 are assembled with screws or the like (not shown).

From this state, the air path partition 25 is screwed with the screw j2.
After fixing to the case end plate 22 by 4, the centrifugal fan 29 is attached to one end of the rotor shaft 28 and the blower fan cover 30 is attached.

When power is supplied from the wiring cord 40,
Current flowing through stator coil 31 and rotor unit 33
The rotor shaft 28 rotates integrally with the centrifugal fan 29 due to the magnetic force of the drive magnet 33a provided in the motor, and the air is sucked from the air inlet 30a by this rotation.

The sucked air is supplied to a centrifugal fan 29,
The air path 35 via the air path partition body 25 and the case end face plate 22
After being guided to, it is discharged from the exhaust port 21c. Also,
The inside of the motor case 23 is cooled by the atmosphere when passing through the air passage 35.

On the other hand, by driving the electric blower 1,
A suction function works on a vacuum cleaner body (not shown), and dust and water droplets on the floor are sucked by the suction function.

Most of the sucked dust and water droplets are stored in a dust collecting case (not shown) in the main body of the vacuum cleaner, but depending on the size and amount of the particles, they pass through the dust collecting case and are electrically driven. There is a possibility that the air is guided to the blower 20, and a part of the air enters the air passage 35 from the air inlet 30a.

However, the electric units such as the stator coil 31 and the Hall element 43 of the stator unit 32 and the circuit board 34 are covered with a resin mold 44 such as urethane, and the bearing 26 (27) is exposed on the air passage 35 side. Since the portion is protected by the seal member 36, the adhering dust and water drops are prevented.

The life of the electric blower 20 used in such a vacuum cleaner is determined by the durability of the bearings 26 and 27.

Therefore, by eliminating the inner cylinder 9 and the cover 10 described in the prior art, not only the number of components can be reduced and the assembling work efficiency can be improved, but also the area of the air passage 35 accompanying the abolition can be increased. In addition to ensuring the dustproof and waterproofness of the electric system unit, the dustproof and waterproofness of the bearing 26 (27) can be ensured, so that the life of the electric blower 20 can be extended. it can.

[0028]

As described above, in the electric blower of the present invention, the stator coil and the electric system unit are covered with the resin mold and the exposed portion of the bearing is covered with the sealing material, so that the dust-proof and waterproof effect can be obtained. It is possible to reduce the number of parts to be assembled and to improve the assembling work while maintaining the above conditions, and it is possible to improve the cooling efficiency and the blowing efficiency.

[Brief description of the drawings]

FIG. 1 is a side view of an electric blower according to an embodiment of the present invention, with a part of the electric blower cut away.

FIG. 2 is also an enlarged sectional view of a main part.

FIG. 3 shows a conventional electric blower, and is a longitudinal sectional view of the electric blower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Electric blower 21 ... Case main body 21a ... One end opening part 21b ... Bearing mounting part 22 ... Case end face plate 22a ... Bearing mounting part 23 ... Motor case 26 ... Bearing 27 ... Bearing 28 ... Rotor shaft 29 ... Centrifugal fan 30 ... Fan Cover 31 ... Stator coil 32 ... Stator unit 33 ... Rotor unit 34 ... Circuit board 36 ... Sealing material 40 ... Wiring code (electrical unit) 43 ... Hall element (electrical unit) 44 ... Resin mold

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02K 7/14 H02K 7/14 A

Claims (1)

[Claims] 1. A motor case comprising a case body having a bottomed cylindrical shape, a case end face plate attached to one end opening of the case body and having a bearing mounting portion at a center portion, and a case body having a stator coil. A power supply to the stator unit and an electric system unit for performing electric control, a bearing mounting portion formed at a bottom of the case body, and the bearing formed at the case end face plate A rotor unit having a rotor shaft rotatably supported by bearings respectively mounted on the mounting portion and disposed inside the stator unit;
A centrifugal fan fixed to the end of the rotor shaft that penetrated the bearing mounting portion of the case end plate, and was attached to one end opening of the case body so as to cover the centrifugal fan and the case end plate. An electric blower comprising a fan cover, wherein the stator coil and the electric system unit are covered with a resin mold, and an exposed part of the bearing is covered with a sealing material.