CN100378340C - electric blower - Google Patents

Abstract

The object of the present invention is to provide a high-efficiency and long-life electric blower by reducing the suction loss of cooling air for cooling a motor and the like to improve cooling efficiency. In the central portion of the suction port (9a) of the partition member (9) that separates the cooling fan (8) from the motor (2) side, the bracket (5) that is fixed to the opening of the motor bracket (1) The air supply guide device (9b) bonded to the outer peripheral part of the bearing housing (5a) arranged on the central part, the air sucked by the cooling fan (8) can flow into the air supply guide device (9b) without changing the direction. Inside the cooling fan (8).

Description

electric blower

technical field

The present invention relates to an electric blower used in electric vacuum cleaners and the like.

Background technique

Among such electric blowers in the past, there is an electric blower described in Patent Document 1-JP-A-2002-31090 (page 3, FIG. 1 ), which is composed of a stator, a rotor, a rotating fan, and an air guide , fan casing, the stator is fixed by a pair of brackets, the rotor is arranged in the stator, one side has an output shaft extending from the bracket to the length direction, the rotating fan is mounted on the output shaft, and the air guiding device separates the aforementioned The stator and the rotor are installed between the aforementioned rotary fan, and the fan casing is installed to cover the aforementioned rotary fan and the air guide device, and a plurality of air holes are opened on the outer periphery, wherein the rotary fan for air supply and the rotary fan for cooling are installed. The rotary fans are arranged close to each other. The air intake of the air-sending rotary fan faces the outside of the electric blower to attract outside air. The air intake of the cooling rotary fan faces the inside of the electric blower to suck air in the blower. The wind discharged by the fan is discharged from the air holes on the outer periphery of the common fan case.

In the electric blower described in Patent Document 1, there is a problem that when cooling air is sucked from the stator and the rotor side by the cooling rotating fan, the suction port of the partition member separating the cooling fan from the stator and the rotor side, Since it is adjacent to the bearing shell part provided in the center of the bracket, sufficient air passage cannot be ensured, and the air flowing there flows into the suction port while changing direction along the shape of the bearing shell part of the bracket. loss, and sufficient air volume to cool the motor part cannot be obtained.

The present invention was made to solve the above-mentioned problems, and aims to provide a high-efficiency and long-life electric blower by reducing the suction loss of cooling air for cooling motors and the like and improving cooling efficiency.

Contents of the invention

The present invention is an electric blower, which has a motor bracket, a bracket, a motor, a blower fan, a cooling fan, and a partition member. The upper opening of the motor bracket has vent holes on the sides, and a bearing shell is arranged at the central part of the bottom. The bracket is fixed to the opening side of the motor bracket, and a bearing shell is provided at the center. The motor is composed of a rotor and a stator supported on the bearing shell of the motor bracket and the bracket. The blower fan is above the bracket. It is fixed on the motor shaft, and the sucked air is discharged from the periphery. The cooling fan is fixed on the motor side of the blower fan, and the air sucked from the air hole of the motor bracket is discharged from the periphery. The partition member has a suction port in the center. , to separate the aforementioned cooling fan and the motor side, wherein, at the central portion of the suction port of the aforementioned partition member, an air blowing guide device bonded to the outer peripheral portion of the bearing housing provided on the aforementioned bracket is provided.

Description of drawings

Fig. 1 is a longitudinal sectional view of a part of an electric blower according to one embodiment of the present invention.

Fig. 2 is an enlarged view of main parts of Fig. 1 .

Fig. 3 is a plan view showing the relationship between the partition member and the bracket in Fig. 1 .

Fig. 4 is an enlarged sectional view taken along line X-X in Fig. 3 .

Detailed ways

1 is a longitudinal sectional view of a part of an electric blower according to an embodiment of the present invention, FIG. 2 is an enlarged view of main parts in FIG. 1 , and FIG. 3 is a plan view showing the relationship between a partition member and a bracket in FIG. 1 .

In the figure, the motor bracket 1 has a bottom surface and a side surface. The upper opening surrounded by the above-mentioned side surface has a plurality of ventilation holes 1a on the above-mentioned side surface. 3 and a motor 2 composed of a rotor 4 rotating at a high speed.

In addition, the bracket 5 fixed on the upper opening of the motor bracket 1 has a bearing housing 5a in the center, and a first air hole 5b is provided around it, and on the outer periphery of the air hole 5b, on the outer periphery of the motor bracket 1 A plurality of second ventilation holes 5c are provided on the top. Then, the bearings 6 provided on both ends of the shaft 4 a of the motor 2 on the rotor 4 are supported by the motor bracket 1 and the bearing housings 1 b and 5 a of the frame 5 . Moreover, the blower fan 7 which has the suction port 7a in the center part is fixed to the shaft 4a of the rotor 4, and rotates together with the rotor 4. As shown in FIG. 8 is a cooling fan which has a suction port 8a in the center and is fixed to the rear side of the blower fan 7 (motor 2 side).

The partition member 9 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 at the central portion of the suction port 9a, an adhesive bonded to the outer periphery of the bearing housing 5a of the bracket 5 is provided. Combined air supply guide device 9b, the air supply guide device 9b is integrally connected with the partition member 9 through a plurality of reinforcing ribs 9c. In addition, there is also a columnar leg portion 9d that separates the first vent hole 5b and the second vent hole 5c of the bracket 5. On the back side of the leg portion 9d, a plurality of air guide brackets that are discharged from the cooling fan 8 are provided. 5 blades 9e of the second air hole 5c.

The bushing 10 separating the fan 7 side and the cooling fan 8 side is in contact with the top of the vane 9e of the partition member 9, the outer peripheral portion of the press-fit bracket 5 is fixed, and an opening 10a is provided in the center. 11 is a guide impeller, which is fixed on the outer peripheral surface of the casing 10 and guides the air discharged from the blower fan 7 into the outer peripheral direction. The fan cover 12 covering the blower fan 7 and the guide vane 11 has a suction hole 12a in the center and a plurality of exhaust holes 12b on the side for discharging the air guided by the guide vane 11 to the outside.

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 4 a of the rotor 4 rotate to suck outside air. Then, the air sucked from the suction port 7a of the blower fan 7, as shown by the arrow A in the figure, passes through the inside of the blower fan 7, is rectified by the guide impeller 11, and flows from the side surface of the fan cover 12 while restoring the pressure. The exhaust hole 12b exhausts to the outside.

On the other hand, the air sucked by the cooling fan 8 flows in from the vent hole 1b of the motor bracket 1 as shown by the arrow B in the figure, and cools the stator 3, the rotor 4, etc., while cooling the stator 3, the rotor 4, etc. The suction port 9a on the outer periphery of the wind guide device 9b flows into the suction port 8a of the cooling fan 8, flows out from the outer peripheral portion through the inside of the cooling fan 8, is introduced into the blade 9e, and is discharged from the second air hole 5c of the bracket 5 to the outside.

According to the present invention, since the central part of the partition member 9 is provided with an air blowing guide 9b bonded to the outer peripheral portion of the bearing housing 5a of the bracket 5, the air sucked by the cooling fan 8 can pass along the air blowing guide 9b without The flow changes direction into the cooling fan 8 . Therefore, the conventional loss caused by changing the flow direction can be reduced, and the cooling air volume can be increased. Accordingly, since a high cooling effect can be obtained, deterioration of the motor 2 due to temperature rise can be prevented, and a long-life electric blower can be obtained.

In addition, since a plurality of reinforcing ribs 9c are provided between the inner wall of the suction port 9a of the partition member 9 and the outer wall of the air supply guide 9b, the sucked air flows into the cooling fan while being rectified by the reinforcing ribs 9c. 8 suction port 8a, so further high air volume can be obtained, which can improve the cooling effect.

In addition, as shown in FIG. 4 , by making the upper and lower surfaces 9f and 9g of the rib 9c having a rectangular cross section R-shaped, a higher rectifying effect can be obtained.

In addition, the air blowing guide 9b arranged on the partition member 9 is bonded and fixed with the outer periphery of the bearing shell 5a of the support 5, since the vibration generated when the rotor 4 and the blowing fan 7 rotates at a high speed can be suppressed from the bearing shell 5a to the bearing shell 5a. The motor 2 is externally transmitted, so a low-vibration electric blower can be obtained.

In the electric blower of the present invention, since the central portion of the suction port of the partition member separating the cooling fan and the motor side is provided, the outer peripheral portion of the bearing housing provided on the central portion of the bracket fixed to the opening of the motor bracket is provided. With the bonded air supply guide device, the air sucked by the cooling fan can flow into the cooling fan without changing the direction along the air supply guide device, so the loss caused by changing the flow direction in the past can be reduced and the cooling air volume can be increased. Accordingly, since a high cooling effect can be obtained, deterioration of the motor due to temperature rise can be prevented, and a long-life electric blower can be obtained.

Claims (2)

1. electric blowing machine, has the motor carriage, support, motor, blowing fan, cooling fan, partition member, the upper opening of this motor carriage has vent on the side, central part in the bottom is provided with cartridge housing, this support is fixed in the opening portion side of this motor carriage, be provided with cartridge housing at central part, this motor is made of rotor and the stator on the cartridge housing that is supported on aforementioned motor carriage and support, this blowing fan in the upper fixed of aforementioned brackets on motor drive shaft, discharge the air that attracts from periphery, this cooling fan is fixed in the motor-side of this blowing fan, discharge the air that attracts from the vent of aforementioned motor carriage from periphery, this partition member is provided with suction port at central part, separate aforementioned cooling fan and motor-side, it is characterized in that,, be provided with and be arranged at the bonding air-supply guiding device of peripheral part of the cartridge housing on the aforementioned brackets at the central part of the suction port of aforementioned partition member.

2. electric blowing machine as claimed in claim 1 is characterized in that, between the suction port and air-supply guiding device of aforementioned partition member, is provided with both stiffening ribs of a plurality of connections.

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