JPH0232879Y2 - - 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.

[Prior Art] A conventionally known electric blower is 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 one end opening of the case body 2. In this case 1,
A stator 4 is housed therein, and bearings 5 are attached to the case body 2 and the case end plate 3, respectively.
A rotor 6 with a rotor shaft 6a supported therein (only one of which is shown) is housed. A fan 7 is attached to the penetrating end of the rotor shaft 6a passing through the case end plate 3.
is attached, and a fan cover 8 that covers the fan 7 is fitted and supported on the case end plate 3. Incidentally, reference numeral 9 in FIG. 7 indicates that the rectifying plate 10 is a brush device. Furthermore, as shown in FIG. 5, the case end plate 3 is a press-molded product in which a central bearing support part 3b is supported by two arms 3c on an annular attachment part 3a to the opening edge 2a of the case body 2. Alternatively, as shown in FIG. 6, a press-formed product in which a central bearing support part 3b is supported by two arms 3c is used in the annular mounting part 3a.

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.

[Problems to be Solved by the Invention] However, since the case end plate 3 is designed to attach the fan cover 8, 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 in the vertical direction in FIG. 7 between the case body 2 and the opening edge 2a of the stator winding, the case body 2 is formed deeply and the stator winding is placed below the opening edge 2a of the case body 2 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.

An object of the present invention is to provide an electric blower that can shorten the axial length, can be constructed at low cost, and has low windage loss and good 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 one end open, and houses a stator and a rotor in the cylindrical part, and a case body having an exhaust hole on the opposite side, a case end plate located at one end opening 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, a fan cover attached to an opening at one end of the case body to cover the fan, and a pair of brush devices attached to the case body by inserting the cylindrical part thereof. The case end plate is formed in a shape that has the bearing support part in the center and radially crosses one end opening of the cylindrical part, and both ends of the case end plate are connected to the case body. One end of the stator core is fixed to the opening edge and disposed between the fan side portions of the stator windings of the stator, and the outer shape of the stator core of the stator is rectangular when viewed from the axial direction. The corner portions of the child core are brought into close contact with the inner surface of the cylindrical portion, and between the inner surface portion of the cylindrical portion facing the outer surface portion of the longer side of the rectangular stator core, A pair of first air passages are formed, one end of which does not face the case end plate, and an outer portion of the short side of the rectangular stator core and an inner surface of the cylindrical portion opposing thereto. A pair of second air passages each having one end facing the case end face plate are formed between them, 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. One ends of both air passages are made to communicate with the fan side, and the other ends are made to communicate with the exhaust hole side, and the protrusion inside the cylindrical part inserted into the cylindrical part of the brush device is an extension of the second air passage. It is placed on the downstream side.

[Function] According to the configuration of the present invention, the case end plate having a shape that radially crosses the opening at one end of the cylindrical portion of the case body is disposed between the fan side portions of the stator windings of the stator. In this case, a sufficient insulation distance can be secured between the case end plate and the fan side portion of the stator winding without arranging the case end plate so as 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.
A necessary and sufficient air path can be secured in the air path, and the air passing through the case body can mainly pass through the first air path. Moreover, since the cross-sectional area of the air passage is smaller than that of the first air passage and one end faces the case end plate, the cylindrical part of the brush device is located on the downstream side in the extending direction of the second air passage, which cannot be effectively used as an air passage. Since the protrusion is provided, the protrusion inside the cylindrical part does not disturb the flow of air passing through the first air passage. Therefore, windage loss when passing through the case body is reduced, and performance can be improved.

[Embodiment] An embodiment of the present invention will be described below 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 on the downstream side of the air passage, which will be described later.

The case body 22 houses a stator 30 and a rotor 32 with a commutator 31, and a pair of brush devices 33 are attached to the cylindrical portion 25 of the case body 22.

The rotor 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.

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

Further, the pair of brush devices 33 are installed such that the inner cylindrical protrusion 33a, which is inserted through the cylindrical portion 25, is located on the downstream side in the extending direction of the second air passage 37, facing the case end plate 23. . Note that protrusions such as terminal portions of a winding frame (not shown) included in the stator 30 are located within the second air passage 37 .

The case end plate 23 is a press-molded metal product. This end plate 23 has a shape that radially crosses one end opening of the case body 22, for example, a planar shape is formed in a substantially band shape, and a bearing support portion 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.

The first air passage 36 is formed between the outer surface portion of the long side of the stator core 34 and the inner surface portion of the cylindrical portion 25 facing thereto, and the cross-sectional area of the first air passage 36 is reduced to the second air passage 37. Not only is the first air passage 36 larger than the first air passage 36, but also because its inlet does not face the case end plate 23, the first air passage 36 can substantially ensure a necessary and sufficient air passage area. In addition, case end plate 2
The second air passage 37 covered by the second air passage 37 is formed between the outer surface portion of the short side of the stator core 34 and the inner surface portion of the cylindrical portion 25 facing thereto, and has a small cross-sectional area. Because the case end plate 23 is
Even though the air passage 37 is covered, the entrance area of the air passage required for the entire blower is not significantly reduced. Therefore, the performance of the electric blower can be improved.

That is, 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 of the housing 6 . Moreover, the second air passage 3
Since the brush device 33 and the protrusion of the winding frame are disposed on the 7 side so that they do not face the first air path 36, a large amount of air passing through the first air path 36 is directed toward the brush. The gas is discharged from the exhaust hole 29 without being disturbed by colliding with the inner protrusion 33a of the cylindrical portion of the device 33 or the like.

In this way, the air can mainly pass through the first air passage 36 and into the case body 22.
Its distribution is smooth and windage damage can be reduced. Therefore, the performance of the electric blower can be improved.

Although the above embodiment is configured as described above, the exhaust hole 29 may be provided in the bottom 24 on the downstream side in the extending direction of the first air passage 36. and,
In the present invention, both end portions of the case end plate 23 may be formed into a bifurcated shape, and both end portions of the case end plate 23 fixed to the mounting portion 26 may be formed into an L-shaped cross section. Further, the case end plate 23 may have a dogleg shape in plan view, and such an aspect is also included in the concept of a shape that radially traverses the opening of the case body 22 in the present invention. Further, in the above embodiment drawings, the stator winding 35 protrudes from the fan side surface of the case end plate 23, but in the present invention, it does not necessarily need to protrude, and in this case also, the stator winding 35 protrudes from the fan side surface of the case end plate 23. helps shorten the axial length. 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, case end plate, bearing support part, fan, fan cover, rotor, rotor shaft, stator, fixing Child winding, first air path, second air path, exhaust hole,
It goes without saying that the specific structure, shape, position, material, etc. of the brush device and its cylindrical internal protrusion are not limited to the one embodiment described above, and can be configured and implemented in various ways.

[Effects of the invention] In the electric blower of the invention described 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 part 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 of the main body on the opening side, and a pair of brush devices attached by inserting the cylindrical part into the case main body, the case end plate is attached to the central part of the electric blower with the bearing support in the center. The stator of the stator is formed such that the end face plate has a shape that radially crosses the opening at one end of the cylindrical part, and both ends of the end plate are fixed to the edge of the opening at one end of the case body. A stator core disposed between the fan side portions of the windings 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 respectively arranged on the inner surface of the cylindrical portion. A pair of first first plates, one end of which does not face the case end plate, are closely spaced between the outer surface portion of the long side of the rectangular stator core and the inner surface portion of the cylindrical portion opposing thereto. One end faces the case end plate, forming an air path, and is located 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. a pair of second air passages, and the cross-sectional area of the first air passage is larger than the cross-sectional area of the second air passage, and the one ends of the two air passages are communicated with the fan side. At the same time, the other end is communicated with the exhaust hole side, and the protruding part inside the cylindrical part inserted into the cylindrical part of the brush device is arranged on the downstream side in the extending direction of the second air path. By bringing the bearing support part of the face plate closer to the stator side and shortening the axial length of the case body, the entire electric blower can be made smaller, and this miniaturization improves the efficiency of material removal for the case body and case end plates. Therefore, the material cost is reduced and the structure can be made at low cost. Then, the necessary A sufficient cross-sectional area of the air passage is ensured in the first air passage, and the wind passing through the first air passage is not disturbed by the protrusion inside the cylindrical part of the brush device, so that the air passing inside the case body is Since windage loss can be reduced, 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. 22...Case body, 23...Case end plate,
25...Cylindrical portion, 29...Exhaust hole, 30...Stator, 32...Rotor, 33...Brush device, 33a
...Cylindrical portion inner protrusion, 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] A case body having a cylindrical part with an opening at one end, housing a stator and a rotor in the cylindrical part, and having an exhaust hole on the opposite side to the opening; A case end plate located at the opening at one end 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 body 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 and a pair of brush devices attached by inserting the cylindrical part into the case body, the case end plate is attached to the center part of the electric blower, and the bearing support part is attached to the center of the electric blower. The stator winding of the stator is formed by having a shape that radially crosses the opening at one end of the cylindrical portion, and fixing both ends of the end plate to the edge of the opening at one end of the case body. The stator core of the stator is arranged between the fan side portions of the wire, and the stator core of the stator has a rectangular outer shape when viewed from the axial direction, and the corner portions of the stator core are closely connected to the inner surface of the cylindrical portion. A pair of first windshields, one end of which does not face the case end plate, are 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. a pair of rectangular stator cores, one end of which is opposed to the case end plate, is provided between the short side outer surface portion of the rectangular stator core and the opposing inner surface portion of the cylindrical portion; and a cross-sectional area of the first air path is larger than a cross-sectional area of the second air path, and the one ends of the two air paths are communicated with the fan side. In addition, the other end is communicated with the exhaust hole side, and the protruding part inside the cylindrical part inserted into the cylindrical part of the brush device is disposed on the downstream side in the extending direction of the second air path. Blower.