JPH0231597Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric blower used in a vacuum cleaner or the like.

[Conventional technology]

Conventionally known electric blowers are shown in FIGS. 5 to 7. Reference numeral 1 in these figures denotes a motor case consisting of a bottomed cylindrical case body 2 provided with an exhaust hole 2b, and a case end plate 3 attached to an opening at one end of the case body 2. The case 1 houses a stator 4 and a rotor 6 whose rotor shaft 6a is supported by bearings 5 (only one shown) attached to the case body 2 and the case end plate 3, respectively. ing. A fan 7 is attached to the penetrating end of the rotor shaft 6a passing through the case end plate 3.
A fan cover 8 that covers the fan 7 is fitted and supported. In addition, in FIG. 7, 9 is a rectifying plate, and 10 is a brush device. Furthermore, as shown in FIG. 5, the case end plate 3 has a central bearing support part 3b attached to the annular attachment part 3a to the opening edge 2a of the case body 2.
Conventionally, a press-formed product supported by a book arm 3c, or a press-formed product in which a central bearing support portion 3b is supported by two arms 3c on an annular mounting portion 3a as shown in Fig. 6, has been used. .

This electric blower includes a rotor 6 and a fan 7.
By rotating the , a wind flow as shown by the solid line arrow in FIG. After passing through the air passages 11 and 12, the air is discharged from the exhaust hole 2b to cool the stator 4 and rotor 6.

[The problem that the idea aims to solve]

However, since the fan cover 8 is attached to the case end plate 3, the annular attachment portion 3a is necessary. For this reason, the case end plate 3 is large, which is a cause of high cost. Furthermore, the arm 3c of the case end plate 3 and the stator winding 4 of the stator 4
Since it is necessary to provide an insulating distance between the case body 2 and the opening edge 2a in the vertical direction in FIG. The stator 4 is housed so that the wire 4a is located. Therefore, the axial length L of the case body 2 is large, and this is also a cause of high cost.

Therefore, the present inventor developed and prototyped an electric blower that can shorten the axial length and can be constructed at low cost.

In this new and unknown electric blower, the eighth
As shown in Fig. 10, the case end plate 3
is shaped so as to radially cross the opening at one end of the case body 2 by providing a bearing support part 3a through which the rotor shaft 6a passes through the central part of the bearing support part 3a. 2a, and a case end plate 3 is disposed between the stator windings 4a of the stator 4.

One measure to improve the performance of this new electric blower is to reduce the loss of air passing through the case body 2.

However, due to the shape and arrangement of the case end plate 3,
It is unavoidable that both ends of this are opposed to the air passage 12. Therefore, when the exhaust hole 2b is provided on the air passage 12 side as shown in Figs. Based on various prototypes, it was found that since the air is discharged from the exhaust hole 2b after changing direction, the windage loss is large.

An object of the present invention is to provide an electric blower that can shorten the axial length and be constructed at low cost, as well as improve performance.

[Means for Solving the Problems] In order to achieve the above object, the electric blower of the present invention has a cylindrical part with an opening at one end, houses a stator and a rotor in this cylindrical part, and a case body having an exhaust hole on the opposite side, a case end plate located at the opening at one end of the cylindrical part and attached to the case body, and a rotor passing through a bearing support provided on the end plate. An electric blower comprising a fan attached to a shaft and a fan cover attached to an opening at one end of the case body to cover the fan, the case end plate having the bearing support part in the center thereof. An opening at one end of the cylindrical portion is formed in a shape that crosses in the radial direction, and both ends of the end plate are fixed to the edge of the opening at one end of the case body to form a fan side of the stator winding of the stator. A stator core disposed between the sections and provided in the stator has a rectangular outer shape when viewed from the axial direction, and the corner portions of the stator core are brought into close contact with the inner surface of the cylindrical portion, respectively. A pair of first air passages, one end of which does not face the case end plate, are formed between the outer surface portion of the longer side of the rectangular stator core and the inner surface portion of the cylindrical portion opposing thereto. In addition, a pair of second windshields, one end of which faces the case end plate, are provided between the outer surface portion of the shorter side of the rectangular stator core and the inner surface portion of the cylindrical portion opposing thereto. forming a road respectively, and
The cross-sectional area of the first air passage is formed to be larger than the cross-sectional area of the second air passage, and one end of both air passages is communicated with the fan side, and the other end is communicated with the exhaust hole side, The exhaust hole is located on the downstream side in the extending direction of the first air path and is provided in the case body.

[Effect]

According to the configuration of the present invention, the case end face plate having a shape that radially crosses the opening at one end of the cylindrical part of the case body is disposed between the fan side portions of the stator windings of the stator. A sufficient insulation distance can be secured between the face plate and the fan side portion of the stator winding without arranging the face plate to be spaced apart from and facing the fan side portion of the stator winding in the axial direction of the case body. Therefore, the electric blower can be made smaller by shortening the axial length of the case body, and by making the case body smaller, the efficiency of material removal can be improved. Since there is no need to provide an annular mounting portion for mounting, and the efficiency of material removal can be improved, the structure can be constructed at low cost. The cross-sectional areas of the first and second air passages are formed between the cylindrical part of the case body and the outer surface of the stator core housed in the case body with the four corner parts brought into close contact with the inner surface of the case body. Due to the difference in air passages and the arrangement of these air passages and the case end plate, the air passage cross-sectional area is larger than the second air passage, and the first air passage is provided not facing the case end plate.
Air passing through the case body can mainly pass through the air path. Moreover, since the exhaust hole is provided in the case body at the downstream side in the direction of extension of the first air passage, the wind passing through the case body changes direction after passing through the first air passage and flows toward the second air passage. It is discharged out of the case body through the exhaust hole without going around.
Therefore, windage loss when passing through the case body can be minimized, and performance can be improved.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

In the figure, 21 is a motor case, which consists of a case body 22 and a case end plate 23.

The case body 22 is a metal press molded product.
This main body 22 is formed by integrally providing an attachment portion 26 that protrudes outward on the opening edge of a cylindrical portion 25 with a bottom 24 on the side opposite to the bottom 24. bottom 2
A bearing support part 27 is integrally formed in the center of the mounting part 4, and a fitting cylinder part 28 is integrally formed in the outer peripheral edge of the mounting part 26. Further, the case body 22 is provided with an exhaust hole 29 at a position to be described later.

This case body 22 houses a rotor 32 with a stator 30 and a commutator 31, and also has a pair of brush devices 33 attached thereto.

The stator 30 is formed from a stator core 34 having a rectangular outer shape when viewed from the axial direction, and a pair of stator windings 35 wound around the core 34. The fan side portion of the stator winding 35 is projected beyond a plane passing through the mounting portion 26. This stator 30 is fixed within the case body 22 with its four corner portions brought into close contact with the inner surface of the cylindrical portion 25. By this fixation, a pair of first air passages 36 and a pair of second air passages 37 are formed between the cylindrical portion 25 and the stator core 34, respectively.

That is, the first air passage 36 is formed between the long side outer surface portion of the stator core 34 having a rectangular outer shape and the inner surface portion of the cylindrical portion 25 facing thereto. . Further, the second air passage 37 is
Stator core 34 having the above-mentioned rectangular outer shape
It is formed between the outer surface portion of the shorter side of the cylindrical portion 25 and the inner surface portion of the cylindrical portion 25 facing thereto.

The first air passage 36 has one end that does not face the case end plate 23 and is connected to a fan 44 (described later).
side, and the other end is arranged so as to communicate with the exhaust hole 29 side. The second air passage 37 has one end facing the case end plate 23 and has a fan 4 which will be described later.
4 side, and the other end communicates with the exhaust hole 29 side. Moreover, the cross-sectional area of the first air passage 36 is larger than the cross-sectional area of the second air passage 37.

The exhaust hole 29 is located downstream of the first air passage 36 and closer to the first air passage 36 than the second air passage 37, that is, the first
It is provided in the cylindrical portion 25 of the case body 22 at the downstream side in the extending direction of the air passage 36 . Moreover, in this embodiment, the exhaust hole 29 is provided closer to the rotation direction side with respect to the first air passage 36. Arrow A in FIGS. 1, 3, and 4 indicates the direction of rotation of the rotor 32. In FIG.

Note that 39 and 40 in FIG. 1 are bearings that support the rotor shaft 38 of the rotor 32. As shown in FIG.

The case end plate 23 is a press-molded metal product. This end plate 23 has a shape that crosses one end opening of the case body 22 in the radial direction, for example, a planar shape is formed in a substantially band shape, and a bearing support part 41 that supports a bearing 40 is integrally formed in the center of the end plate 23. It is formed. In addition, both side portions of the case end plate 23 centered on the bearing support portion 41 are inclined. The case end plate 23 is fixed at both ends to the mounting portion 26 (opening edge of the case body 22) by screws, welding, caulking, etc., and is attached to the fan side of the pair of stator windings 35. placed between the parts. Due to the arrangement of the case end plate 23, one end of the second air passage 37 is connected to the case end plate 23.
3, and the first air passage 36 does not face the case end plate 23.

Note that the motor case 21, stator 30, rotor 32, brush device 33, and bearings 39, 4
0 forms a drive motor. The rotor shaft 38 passes through a bearing support portion 41 and a bearing 40 supported thereby.

A centrifugal fan 43 is attached to the penetrating end of the rotor shaft 38 with a nut 42 . The fan 43 has an intake port 44 in the center of the plate on the side opposite to the drive motor. Also, Figures 1 and 2
In the figure, reference numeral 45 denotes a fan cover made of metal, which is attached to cover the fan 43 and fit into the fitting cylinder portion 28. This cover 45 has an air guide port 46 that enters the air intake port 44 in the center.

Reference numeral 47 in FIG. 1 denotes a rectifying plate made of synthetic resin that guides the air flow discharged from the fan 43 into the drive motor.

According to the electric blower having the above configuration, since the fan cover 45 is directly attached to the case body 22, there is no need for an annular attachment portion on the case end plate 23, which was conventionally necessary. Therefore, the case end plate 23 can be made smaller, and the efficiency of material removal can be significantly improved. In addition, as a compensation for this, it is necessary to provide the fitting cylinder part 28 in the case main body 22,
The deterioration in the efficiency of material removal for the case body 22 due to this increase is slight, and the reduction in material due to the improvement in the efficiency of material removal for the case end plate 23 is far greater, so the overall amount of material used can be significantly reduced.

Further, by disposing the case end plate 23 between the stator windings 35, the case end plate 23 is not spaced apart from above the stator winding 35 in the figure and is not opposed to the stator winding 35. Even though the stator windings 35
It can be secured between the fan side part of the Therefore, the axial length 1 of the case body 22 can be shortened,
As a result, it is possible to downsize the entire electric blower.
By making the case body 22 smaller, the efficiency of material removal can also be improved.

When the drive motor of this electric blower is operated, the fan 43 is rotated together with the rotor 32, so that the blowing action shown by the arrow in FIG. 1 can be obtained. In this case, the wind passing through the case body 22 has a larger air passage cross-sectional area than the second air passage 37,
In addition, after mainly flowing through the first air passage 36 that does not face the case end plate 23, the first air passage 3
The air is exhausted to the outside of the case body 22 through an exhaust hole 29 located on the downstream side in the extension direction of the housing 6 .

Since the air can pass through the case body 22 in this way, the flow is smooth, and the wind does not change direction to the second air path 37 side, so that it mainly passes through the first air path 36. Since the products are distributed in a uniform manner, windage losses can be minimized. This can improve the performance of the electric blower.

Moreover, in this embodiment, the exhaust hole 29 is connected to the first air path 3.
Since the fan 43 is provided closer to the rotational direction than the fan 43, the exhaust air can be discharged from a position suitable for the bias of the wind caused by the rotation of the fan 43. Therefore, windage loss can be further minimized. Incidentally, if the arrangement is not like this, for example, if the exhaust hole 29 is located directly below the center or right side of the first air passage 36 in FIG. The area is narrowed and windage loss occurs here.

In addition, as described above, wind turbulence can be suppressed and the wind can flow smoothly inside the case body 22, compared to the case where the exhaust holes are provided at the positions shown in FIGS. 9 and 10. , the noise can also be reduced.

Although the above embodiment is configured as described above, in the present invention, both end portions of the case end plate 23 may be formed into a bifurcated shape, and the case end plate 23 may be formed into a bifurcated shape.
Both ends fixed to the mounting portion 26 of No. 3 may be formed to have an L-shaped cross section. Furthermore, the case end plate 23 may have a dogleg-shaped planar shape, and in the present invention, such an aspect is also included in the concept of a shape that radially traverses the opening of the case body 22. In addition, in the above embodiment drawings, the stator winding 3
5 protrudes from the fan-side surface of the case end plate 23, but in the present invention, it is not necessary to protrude, and in this case as well, the axial length can be reduced by the conventional insulation distance. In the present invention, the exhaust hole 29 may be provided on the bottom 24 of the case body 22, or may be provided on both the bottom 24 and the cylindrical portion 25. In addition, when implementing the present invention, unless it is contrary to the gist of the invention, the case body and its cylindrical part, the case end plate, the bearing support part, the fan, the fan cover, the rotor, the rotor shaft, the stator,
The specific structure, shape, position, material, etc. of the stator winding, the first air path, the second air path, the exhaust hole, etc. are not limited to the one embodiment described above, and may be configured in various ways. Of course, it can be implemented.

[Effect of idea]

In the electric blower of the present invention explained above,
a case body having a cylindrical part with one end open, a stator and a rotor housed within the cylindrical part, and an exhaust hole provided on the side opposite to the opening;
A case end plate located at one end opening of the cylindrical portion and attached to the case body, a fan attached to the rotor shaft that passes through a bearing support provided on the end plate, and a case that covers the fan and is attached to the case body. In an electric blower equipped with a fan cover attached to one end opening side of the main body, the case end plate has a shape that has the bearing support part in the center and crosses the one end opening of the cylindrical part in the radial direction. In addition to forming
This end face plate is fixed at both ends to the opening edge of one end of the case body, and is disposed between the fan side portions of the stator windings of the stator, and is arranged in the axial direction of the stator core of the stator. The outer shape as seen from above is rectangular, and the corner portions of this stator core are brought into close contact with the inner surface of the cylindrical portion, so that the outer surface portion of the long side of the rectangular stator core and this A pair of first air passages, one end of which does not face the case end plate, are formed between the opposing inner surfaces of the cylindrical portion, and an outer surface of the short side of the rectangular stator core. A pair of second air passages each having one end facing the case end plate are formed between the inner surface portion of the cylindrical portion and the inner surface portion of the cylindrical portion opposing thereto, and the cross-sectional area of the first air passage is set to the above-mentioned size. The cross-sectional area of the second air passage is larger than that of the first air passage, and one end of both air passages is communicated with the fan side, and the other end is communicated with the exhaust hole side, so that the exhaust hole is connected to the first air passage. The configuration provided in the case body on the downstream side in the extension direction allows the bearing support portion of the case end plate to be brought closer to the stator side, reducing the axial length of the case body, making it possible to downsize the entire electric blower. At the same time, due to the improved efficiency of material removal for the case main body and case end plate due to this miniaturization, the material cost is reduced and the structure can be made at low cost. The case is determined by the size of the cross-sectional area of each of the first air passage and second air passage formed within the case body, the arrangement of the case end plate with respect to these air passages, and the arrangement of the exhaust holes with respect to each air passage. Since the windage loss of the wind flowing inside the main body can be minimized, performance can be improved.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
1 is a side view partially shown in cross section, FIG. 2 is an exploded perspective view, FIG. 3 is a side view of the drive motor, and FIG. 4 is a plan view of the drive motor partially shown in cross section. 5 to 7 show a conventional example, FIG. 5 is an exploded perspective view, FIG. 6 is a perspective view showing another example of the motor end plate, and FIG. 7 is a partially sectional side view. It is.
8 to 10 show the prior art, FIG. 8 is a perspective view showing a part of the drive motor, FIG. 9 is a front view of the drive motor, and FIG. 10 is a partially sectional view of the drive motor. FIG. 22...Case body, 23...Case end plate,
25... Cylindrical part, 29... Exhaust hole, 30... Stator, 32... Rotor, 34... Stator core, 35
...Stator winding, 36...First air path, 37...Second air path, 38...Rotor shaft, 41...Bearing support portion, 43...Fan, 45...Fan cover.

Claims (1)

[Claims for Utility Model Registration] (1) Having a cylindrical part with an open end, housing a stator and a rotor in this cylindrical part, and
It passes through a case body with an exhaust hole provided on the opposite side of the opening, a case end plate located at the opening at one end of the cylindrical part and attached to the case body, and a bearing support provided on this end plate. In an electric blower equipped with a fan attached to a rotor shaft and a fan cover attached to an opening side at one end of the case body to cover the fan, the case end plate has the above-mentioned bearing support part in the center. The opening at one end of the cylindrical portion is formed in a shape that crosses the opening in the radial direction, and both ends of the end plate are fixed to the edge of the opening at one end of the case body so that the stator windings of the stator are connected to each other. A stator core provided in the stator is disposed between the fan side portions, and has a rectangular outer shape when viewed from the axial direction, and each of the corner portions of the stator core is brought into close contact with the inner surface of the cylindrical portion. A pair of first air channels, one end of which does not face the case end plate, is provided between the outer surface portion of the longer side of the rectangular stator core and the inner surface portion of the cylindrical portion opposing thereto. Along with forming;
A pair of second air channels, one end of which faces the case end plate, is provided between the outer surface portion of the shorter side of the rectangular stator core and the inner surface portion of the cylindrical portion opposing thereto. and the cross-sectional area of the first air passage is larger than the cross-sectional area of the second air passage, and one end of both air passages is communicated with the fan side, and the other end is connected to the fan side. An electric blower, characterized in that the electric blower is connected to an exhaust hole side, and the exhaust hole is provided in the case body on the downstream side in the extending direction of the first air path. (2) The electric blower according to claim (1), wherein the exhaust hole is located closer to the rotational direction of the first air path.