JPH09203395A - Motor-driven blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool the circumference of a commutator and a brush device, by providing a rib which starts from an opening end on a non-opening side not including a brush device in the peripheral rotating direction of a housing and is extended in the direction of a brush or the commutator, from the peripheral line of a stator core to a motor inside. SOLUTION: Discharge openings 16 to 19 are opened to the periphery of a housing 4, and non-opening parts 20 to 23 are arranged thereto by being sandwiched between the discharge openings. A sieving flow 24 is generated by the non-opening parts 20 and 22. A wind speed of wind discharged from a channel between a stator core 28 and the housing 4 is strengthened toward a rotating direction, therefore, a rib 25 is arranged from opening ends on a side that are brought into contact with the non-opening parts 20 and 22 not including brush devices in the openings 16 and 18 in the rotating direction to a hosing inside. Hereby, wind having a strong wind speed can be efficiently made to be the slewing flow, and a cooling wind around a commutator 26 and the brush device can be strengthened, therefore, cooling can be effectively executed.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an electric blower.

[0002]

2. Description of the Related Art Conventionally, as a cooling method around a commutator / brush device, a cross-sectional area of an air passage between a stator core and a housing or between an armature and a stator is increased, and an area of an exhaust port on a side surface of the housing is increased. There is a method of increasing the flow rate of the air, and a method of providing an air guide or the like in the housing and concentrating the entire air flow around the commutator / brush device to cool it.

[0003]

However, in the former case, the increase in the output of the electric blower causes restrictions on the wire diameter of the winding wire, the core width, etc., and the problem of strength. It is difficult. Further, in the latter case, since the wind direction is forcibly corrected to the opposite direction to the original direction, a large ventilation loss occurs, and there is a drawback that the overall efficiency deteriorates.

An object of the present invention is to cool the commutator and the area around the brush device while suppressing the deterioration of efficiency without increasing the number of parts or drastically changing the conventional structure.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a rib starts from an opening end on the non-opening side on the outer periphery of the housing and does not include a brush device portion in the rotational direction, and extends toward the brush or the commutator inward of the motor from the outer periphery of the stator core. By providing the above, the above-mentioned problems can be solved.

As a result of analyzing the flow of the cooling air inside the electric blower, the highest exhaust air velocity at the core outlet is
It was found that it was the tip on the rotation direction side of the space between the stator core and the housing. In addition, the cooling air near the commutator does not come directly from the core side, but the wind that swirls along the inner surface of the housing above the brush device flows from above the commutator toward the core side. It was found that this flow is called swirl flow. Further, the flow path of the swirling flow is mainly the non-opening part sandwiched by the opening part of the housing and not including the brush device part, and the expansion of this area leads to the increase of the swirling flow. However, if the area of the non-opening portion is simply expanded as it is, the area of the exhaust port is reduced, which leads to an increase in loss.

Looking at the positional relationship between the stator core and the housing opening of the conventional electric blower, the housing opening is located near the tip in the rotational direction between the stator core and the housing where the exhaust wind velocity is highest at the core outlet. The strongest exhaust flows out of the electric blower through the housing opening, and only a part of the exhaust is swirled.

According to the present invention, the rib extending from the housing opening end start position to the inside of the housing is provided so as to face the brush and the sliding portion of the brush and the commutator. Can be prevented from flowing out of the opening, and can be efficiently directed to the commutator cooling.

[0009]

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

First, FIGS. 5 and 6 show an example of a typical electric blower used for an electric vacuum cleaner.

The electric blower 1 is composed of an electric motor section 2 and a blower section 3.

The electric motor section 2 is a commutator type electric motor, and as shown in FIG.
The armature 6 and the stator 7 are stored. Stator 7
Is a two-pole structure, and a pair of brush device parts 10 arranged between the stator windings 8 and 9 are mounted in the housing 4. The armature 6 is supported by bearings 11 and 12,
The rotating shaft 13 penetrates the end bracket 5 and extends toward the blower unit 3 side. In the blower unit 3, a centrifugal impeller 14 is arranged on the end bracket 5 so as to be integrally fixed to the rotating shaft 13, and a casing 15 is press-fitted and fixed to the outer periphery of the end bracket 5 so as to cover them.

Next, FIG. 1 shows an embodiment of the present invention.

In this example, four exhaust ports 16 to 19 are opened on the outer circumference of the housing 4, and there are four non-opening parts 20 to 23 sandwiched by the exhaust ports. Of these, the swirling flow 2
What is most important for generating No. 4 is 20, 22 that does not include the brush device unit 10. Stator core 28 and housing 4
Since the wind speed of the wind coming out of the flow path between the two becomes stronger in the rotation direction, the opening ends of the openings 16 and 18 in the rotation direction on the side in contact with the non-opening portions 20 and 22 not including the brush device. Therefore, by providing the rib inside the housing, the wind in the portion having a high wind speed can be efficiently turned into the swirling flow 24, and thus the cooling air around the commutator 25 and the brush device portion 26 can be strengthened. Further, at this time, although the ventilation loss increases because the exhaust flow path is slightly narrowed, the efficiency of the electric blower 1 as a whole is improved because the efficiency improvement due to the increase of the cooling air is superior.

2 to 4 show another embodiment of the present invention.

FIG. 2 shows an example in which the opening is widened to the upper surface of the housing 4 and the rib 25 is expanded vertically to be integrated with the upper surface of the housing 4 in order to avoid the reduction of the opening area due to the rib 25. It has the advantages of excellent strength and little leakage of swirling flow.

FIG. 3 and FIG. 4 are intended to reduce the ventilation resistance by integrating the non-opening portion 20 and the rib 25.

[0018]

According to the present invention, the deterioration of efficiency is minimized and the commutator and the brush device parts are effectively surrounded without increasing the number of parts or significantly changing the conventional structure. Cooling can be done.

[Brief description of drawings]

FIG. 1 is a perspective view of an electric blower according to an embodiment of the present invention.

FIG. 2 is a perspective view of an electric blower according to a second embodiment of the present invention.

FIG. 3 is a perspective view of an electric blower according to a third embodiment of the present invention.

FIG. 4 is a perspective view of an electric blower according to a fourth embodiment of the present invention.

FIG. 5 is a perspective view of a conventional example of an electric blower.

FIG. 6 is a cross-sectional view of an internal structure example of an electric blower.

[Explanation of symbols]

4 ... Housing, 9 ... Winding, 10 ... Brush device, 16-
19 ... Exhaust port, 20-23 ... Non-opening part, 24 ... Swirl flow,
25 ... Rib, 26 ... Commutator, 28 ... Stator core.

Claims (1)

[Claims] 1. An end bracket having a suction port is provided on an end face on the opening side, the stator being provided with a stator, an armature, and a pair of brush device parts inside a housing having a cylindrical part whose one end is opened. An electric motor for a two-pole stator having a fan in which a bearing support portion of the end bracket is attached to a shaft of a rotor passing therethrough, a fixed guide vane for guiding an exhaust flow of the fan to the end bracket, and a fan casing covering the fixed guide vane. In the blower, a rib that extends in the brush or commutator direction from the outer peripheral line of the stator core to the inside of the motor is provided, starting from the opening end on the non-opening side that does not include the brush device portion in the rotation direction of the outer periphery of the housing. A characteristic electric blower.