JPH0229270Y2 - - 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 FIG. Reference numeral 1 in FIG. 10 denotes a motor case consisting of a case body 2 and a case end plate 3 attached to an opening at one end of the body 2. As shown in FIG. This 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.
is stored. A fan 8 is attached to the penetrating end of the rotor shaft 6a, which passes through the rectifying plate 7 provided to cover the case end plate 3 and the opening at one end of the case body 2. Further, a fan 78 and a fan cover 9 covering the rectifying plate 7 are fitted and supported on the case end plate 3 .

This electric blower includes a rotor 6 and a fan 8.
By rotating the , air is blown as shown by the solid line arrow in Fig. 10, and this air is directed to the case body 2.
The stator 4 etc. are cooled while passing through the interior.

[Problems to be Solved by the Invention] By the way, since the case end plate 3 is made of metal, it is necessary to provide an insulation distance A between it and the stator winding 4a of the stator 4. However, in the above-mentioned conventional structure, in order to provide the insulation distance A, the case end plate 3 is disposed upwardly away from the stator winding 4a in FIG. In other words, the case body 2 is formed deeply (long), and the stator 4 is arranged so that the stator winding 4a is located lower in the figure than the opening edge 2a.
is stored.

As described above, in the conventional system, the stator winding 4 is located a certain distance below the current plate 7 (in FIG. 10).
a is arranged, the high-velocity airflow that has passed between the rectifying blades inside the baffle plate 7 has a path from there until it reaches the fan side portion of the stator winding 4a which is arranged at a certain downward position. long. Due to the long path length of the wind, the airflow discharged from the fan 8 changes from dynamic pressure to static pressure within the above path, and its speed suddenly drops, becoming a low-velocity airflow. and hits the stator winding 4a. Therefore,
Since the stator winding 4a cannot be efficiently cooled, copper loss in the stator winding 4a increases, resulting in a decrease in the performance of the drive motor.

In addition, as mentioned above, since the entire stator winding 4a is housed within the motor case 1, the motor case must be made longer, resulting in a longer axial length of the electric blower as a whole. It was hot.

An object of the present invention is to provide an electric blower that can improve the performance of a drive motor and shorten its axial length.

[Means for Solving the Problems] In order to achieve the above object, the electric blower of the present invention includes a case body housing a stator and a rotor,
A motor case consisting of a case end plate attached to an annular flat part formed on an opening edge at one end of the main body, and having a wind intake on the side of the case end plate, and a bearing support part provided on the case end plate. a centrifugal fan attached to a rotor shaft passing through the case body; a rectifier plate provided to cover an opening at one end of the case body to guide the wind discharged from the fan into the case body; and the rectifier plate and the fan. and a fan cover attached to one end opening side of the case body, the fan side portion of the stator winding of the stator passing through the air intake port of the motor case, The annular plane portion of the case body is protruded toward the fan side, and the fan side portion is bent in a radial direction away from the rotor axis and inserted into the baffle plate, and the baffle plate A rectifying blade provided inside the rectifying blade is continuously provided from an air inlet formed on the circumference of the rectifying plate to a position near the fan side portion of the stator winding.

[Function] The present invention allows the fan-side portion of the stator winding of the stator to pass through the air intake port of the motor case so that it protrudes beyond the annular plane portion of the case body toward the fan side, and is inserted into the inside of the rectifying plate. Since the fan side part was bent in the radial direction away from the rotor axis, the fan side part of the stator winding was brought closer to the fan outlet, and the stator winding was removed from this outlet. The length of the wind path to the fan side can be shortened. Moreover, the air discharged from the fan is continuously rectified by the rectifying blades of the rectifying plate until it reaches a position near the fan side portion of the stator winding, thereby suppressing speed loss due to turbulence or the like. Therefore, the airflow discharged from the fan hits the fan-side portion of the stator winding inside the baffle plate before flowing into the case body from the wind intake of the motor case. It can cool the wire.
In this case, the speed of the airflow decreases rapidly as the cross-section of the wind path expands; Since the speed loss is suppressed by the rectifying vanes, the stator windings can be cooled by the high-velocity air flow. Therefore, the cooling efficiency of the stator winding is improved, and a rise in temperature of the stator winding can be suppressed. Therefore, the copper loss of the stator winding is reduced and the performance of the drive motor can be improved. In addition, as mentioned above, the fan side part of the stator winding passes through the wind intake of the motor case and is also installed inside the rectifier plate, so the stator winding is inside the case body. There is no need for space to house the entire stator winding, and no space is required between the fan side portion of the stator winding and the rectifier plate. Therefore, the axial length of the entire electric blower can be shortened.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 8 and 11.

In the figure, reference numeral 11 denotes a motor case, which consists of a case body 12 and a case end plate 13.

The case body 12 is a metal press molded product.
This main body 12 is formed by integrally providing an annular flat part 16 protruding outward on the opening edge of a cylindrical part 15 with a bottom 14 on the opposite side from the bottom 14.
A bearing support portion 17 is integrally formed at the center of the bottom 14, and a fitting cylinder portion 18 is integrally formed at the outer peripheral edge of the annular plane portion 16. Furthermore, the case body 12 has an exhaust hole 1 on the downstream side of the air passage, which will be described later.
9 is drilled.

This case body 12 houses a stator 20 and a rotor 22 with a commutator 21, and also has a pair of brush devices 23 attached thereto.

The stator 20 includes a stator core 24 having a rectangular outer diameter when viewed from the axial direction, and a pair of stator windings 25 wound around the core 24. The fan side portion of the stator winding 25 is
The annular plane part 1 passes through the air intake port which will be described later.
It protrudes more toward the fan side than 6, which will be described later. Not only that, the fan side portion is the rotor 22.
The rotor shaft 28 is bent in a radial direction away from the rotor shaft 28 of the rotor shaft 28 .

Further, the stator 20 has its corner portion connected to the cylindrical portion 15.
The case body 12 is fixed in close contact with the inner surface of the case body 12. By this fixation, a pair of first air passages 26 and a pair of second air passages 27 are formed between the cylindrical portion 15 and the stator core 24, respectively. In addition, the first
In the figure, 29 and 30 are bearings that support the rotor shaft 28 of the rotor 22.

The case end plate 13 is a press-molded metal product. This end plate 13 has a bearing 30 in its center.
A bearing support part 31 is integrally provided to support the bearing support part 31, and the end part is screwed to the annular flat part 16,
It is fixedly attached by welding, caulking, etc.

In this embodiment, in order to shorten the axial length of the case body 12 by bringing the bearing support part 31 closer to the stator core 24 side, and to improve the efficiency of material removal for the case end plate 13, the case end plate 13 is 13,
It is formed to have a shape that radially crosses one end opening of the case body 12, for example, a substantially band-like planar shape, and is disposed between a pair of stator windings 25. Of course, the case end plate 13 and the stator winding 25
Needless to say, the necessary insulation distance is ensured between the two.

A substantially fan-shaped opening formed by the side edge of the case end plate 13 and the inner peripheral edge of the annular plane portion 16 (see FIGS. 2 and 6) serves as the air intake of the motor case 11. As described above, the fan side portion of the stator winding 25 passes through this intake port.

The motor case 11, stator 20,
rotor 22, brush device 23, and bearing 29,
30 forms a drive motor.

Further, numeral 32 in FIGS. 1, 7, and 8 is a rectifying plate made of synthetic resin. The current plate 32 has an outer diameter that is the same as the outer diameter of the annular plane portion 16, and has a plurality of air inlets 33 arranged at equal intervals around the circumference, and a plurality of flow regulating vanes 34 inside. It is formed. The rectifying plate 32 is supported by the annular flat portion 16 and covers one end opening of the case body 12. Further, the fan side portion of the stator winding 25 that protrudes toward the fan side from the annular plane portion 16 is
It is located inside the current plate 32.
Moreover, each of the rectifying vanes 34 has a substantially arc shape, and is continuously provided from the air inlet 33 to a position near the fan side portion of the stator winding 25.

The rotor shaft 28 passes through a bearing support portion 31, a bearing 30 supported by the bearing support portion 31, and a current plate 32, and a centrifugal fan 36 is attached to the penetrating end portion with a nut 35. fan 36
There is an intake port 37 in the center of the plate on the opposite drive motor side.
have. Reference numeral 38 in FIGS. 1 and 3 denotes a metal fan cover, which covers the fan 36 and is fitted into the fitting cylinder 18.
This cover 38 has an air guide port 39 that enters the air intake port 37 in the center.

According to the electric blower having the above configuration, the stator winding 2
5 is not completely housed in the motor case 11, but its fan side portion is passed through the air intake opening of the motor case 11 to protrude beyond the annular flat part 16 of the case body 11 toward the fan 36, Since the rectifying plate 32 is placed inside the rectifying plate 32, there is no need for space to accommodate the entire stator winding 25 within the motor case 11, and the stator winding 25
Also, no space is required between the fan side portion and the rectifying plate 32. Therefore, the axial length of the motor case 11 and the axial length of the entire electric blower can be shortened.

When the drive motor of this electric blower is operated, the fan 36 is rotated together with the rotor 22, so that the blowing action shown by the arrow in FIG. 1 can be obtained. Note that arrow B in FIGS. 5 to 8 indicates the swirling direction of the wind provided by the fan 36.

In this case, the fan side portion of the stator winding 25 is
It penetrates the air intake port of the motor case 11 and protrudes toward the fan 36 side from the annular plane portion 16 of the case body 12, and is bent in the radial direction away from the rotor shaft 28, so that the fan 36 The path of the air from the discharge port to the fan side portion of the stator winding 25 is short. Moreover, since the fan-side protruding portion of the stator winding 25 is located inside the rectifier plate 32, the wind from the fan 36 that has entered the rectifier plate 32 is transferred to the stator winding 25.
After cooling the fan-side protruding portion of the fan, the air flows into the case body 12 through the air intake port.

Therefore, the fan-side portion of the stator winding 25 is impinged on by wind that has a high velocity before flowing into the case body 12. Therefore, the cooling efficiency of the stator winding 25 is improved, and a rise in temperature of the winding 25 can be suppressed. Therefore, the copper loss of the stator winding 25 is reduced, and the performance of the drive motor can be improved.

Moreover, from the air inlet 33 of the rectifier plate 32 to the rectifier plate 3
2 is rectified by the rectifying blade 34, but since the rectifying blade 34 is continuously provided from the air inlet 33 to a position near the fan side portion of the stator winding 25, the wind is rectified by the rectifying blade 34. It can be guided along the rectifying blades 34 so as to hit the fan side portion of the stator winding 25. Therefore,
Speed loss due to turbulent flow of wind from the air inlet 33 to the fan side portion of the stator winding 25 is reduced, and the stator winding 24 can be efficiently cooled by high-speed wind, improving drive motor performance. can be further improved.

FIG. 11 is a characteristic diagram showing the relationship between the temperature of the stator winding (measured by the resistance method) and the air volume. As can be seen from the comparison with the characteristics of the electric blower, even with the same air volume, the temperature rise of the stator winding in this embodiment is smaller than that in this embodiment, and the usefulness of the present invention is clear.

Moreover, since the fan-side portion of the stator winding 25 is provided in the wind intake of the motor case 11, that is, in the position where the wind is concentrated, almost all of the wind discharged from the fan 33 can blow the fan-side portion. Can be cooled. This also helps to further improve the performance of the drive motor.

Although the above embodiment is constructed as described above, the case end plate used in the present invention may be as shown in FIG. 9. In other words, the annular mounting part 40 fixed to the annular plane part and the central bearing support part 41 are
An arm 42 that radially crosses the opening at one end of the case body.
This is the case end plate 43 that is integrally connected to the case end plate 43. When using this end plate 43, the fan side portion of the stator winding protrudes from the annular plane portion through the hole 44 formed by the annular mounting portion 40 and the arm 42, that is, the air intake opening of the case body. It is something that will be done. Of course, since the end plate 43 is formed with the fitting cylinder part 45 for attaching the fan cover, the fitting cylinder part 45 is not required on the outer periphery of the annular flat part of the case body. When provided in the case body, the fitting cylinder portion 45 does not need to be provided on the case end plate 43.

In addition, when implementing the present invention, unless it is contrary to the gist of the invention, the case main body, annular plane part, case end plate, bearing support part, fan, fan cover,
The specific structure, shape, position, material, etc. of the rotor, rotor shaft, stator, stator winding and its fan side portion, rectifier plate, air inlet, rectifier blades, etc. are not limited to the above-mentioned example. It goes without saying that it can be configured and implemented in various ways without having to do so.

[Effects of the invention] In the electric blower of the invention described above,
A motor case consisting of a case body housing a stator and a rotor, and a case end plate attached to an annular flat part formed at one end opening edge of the main body, and having a wind intake port on the side of the case end plate. , a centrifugal fan attached to the rotor shaft passing through a bearing support provided on the end plate of the case, and a centrifugal fan installed to cover an opening at one end of the case body to direct air discharged from the fan into the case body. In the electric blower, the electric blower is equipped with a rectifying plate that guides the fan, and a fan cover that is attached to one end opening side of the case body to cover the rectifying plate and the fan, and the fan side portion of the stator winding of the stator is connected to the fan cover. It passes through the air intake port of the motor case and protrudes toward the fan side from the annular plane part of the case body, and bends this fan side part in the radial direction away from the rotor axis, and the rectifying plate. The rectifying blade is arranged so as to be inserted into the interior thereof, and the rectifying blade provided therein is continuously connected from the air inlet formed in the circumferential portion of the rectifying plate to a position near the fan side portion of the stator winding. With this configuration, as the fan rotated by the drive motor blows air, the fan side portion of the stator winding of the stator is exposed to the high-velocity air flowing inside the rectifying plate and before flowing into the case body. The stator windings can be effectively cooled by cooling the stator windings, thereby improving the performance of the drive motor. Furthermore, the axial length of the entire electric blower can be shortened, such as by not requiring a space for housing the entire stator winding in the motor case, and a compact electric blower can be provided.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the present invention,
Figure 1 is a side view showing a part of the drive motor, Figure 2 is a perspective view of part of the drive motor, Figure 3 is an exploded perspective view, Figure 4 is a front view of the drive motor, and Figure 5 is the drive motor. 6 is a plan view of the drive motor partially shown in cross section, FIG. 7 is a plan view of the drive motor covered with a rectifying plate, and FIG. 8 is a back view of the rectifying plate.
FIG. 9 is a perspective view showing another case end plate.
FIG. 10 is a partially sectional side view of a conventional example. FIG. 11 is a characteristic diagram showing the relationship between air volume and stator winding temperature. 11...Motor case, 12...Case body,
13, 41... Case end plate, 16... Annular plane part, 17, 31, 39... Bearing support part, 20...
Stator, 22... rotor, 24... stator core,
25... Stator winding, 26... First air path, 27...
...Second air passage, 28...Rotor shaft, 29, 30...
Bearing, 32... Current plate, 33... Air inlet, 34...
... Rectifier vane, 36... Fan, 38... Fan cover.

Claims (1)

[Claim for Utility Model Registration] Consisting of a case body housing a stator and a rotor, and a case end plate attached to an annular flat part formed at one end of the opening edge of the main body, the case end plate side is provided with airflow. a motor case having an intake;
A centrifugal fan is attached to the rotor shaft that passes through a bearing support provided on the case end plate, and a centrifugal fan is installed to cover an opening at one end of the case body to guide the air discharged from the fan into the case body. In an electric blower equipped with a current plate and a fan cover attached to one end opening side of the case body to cover the current plate and the fan, the fan side portion of the stator winding of the stator is connected to the fan side of the stator winding of the stator. It passes through the wind intake of the case and protrudes toward the fan side from the annular plane part of the case body, and bends this fan side part in the radial direction away from the rotor axis, and the inside of the current plate. The rectifier blades are arranged so as to be inserted into the rectifier plate, and the rectifier blades provided inside the rectifier plate are continuously provided from an air inlet formed in a peripheral portion of the rectifier plate to a position near a fan side portion of the stator winding. An electric blower characterized by: