JPS6213520B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric blower used, for example, in a domestic vacuum cleaner.

[Conventional technology]

In this type of electric blower,
No. 58502 and Utility Model Application Publication No. 52-159412
As shown in the figure, the fixed guide plate can be directly fixed to the motor housing (end bracket) with screws, or as shown in Figure 1 of Japanese Utility Model Application No. 52-159412, The housing (end bracket) itself is used as a fixed guide plate.

The above-mentioned Utility Model Application No. 58502 and Utility Model Application No. 52-
The fixed guide plate shown in FIG. 7 of Publication No. 159412 has a cylindrical portion formed at the center of the lower surface of the fixed guide plate,
This cylindrical portion is configured to fit into the outer periphery of a bearing support portion formed in the housing.

[Problem that the invention seeks to solve]

In the conventional example described above, the motor housing itself is used as a fixed guide plate, or the fixed guide plate is directly fixed to the motor housing, so that a single electric motor can be used for blowers of various sizes with various specifications. There is a problem that the parts cannot be installed.

Furthermore, in the fixed plate of the conventional example, there is a problem in that air flows backward from the fitting part between the cylindrical part at the center of the lower surface of the fixed guide plate and the bearing support part of the housing, resulting in a decrease in air blowing efficiency.

The present invention provides an electric blower in which blower parts of various sizes and specifications can be attached to one electric motor, and which can prevent air from flowing backward from the fitting part between the fixed guide plate and the housing. The purpose is to provide.

[Means to solve problems]

The above problem consists of an electric motor having a housing provided with a plurality of ventilation holes, a fan casing support press-fitted to the outer periphery of the housing, and a fixed guide provided above the fan casing support and the housing. a turbo-type fan provided above the fixed guide plate, and a fan casing that covers the fan and the fixed guide plate and is press-fitted into the outer circumferential annular cylindrical portion of the fan casing support, The fixed guide plate is provided with a differential user on the outer surface of its upstream side, and a return guide vane on its downstream side,
In an electric blower in which air from the fan is introduced into the electric motor through the ventilation hole by the differential user and the return guide vane, a fitting hole is formed in the center of the fixed guide plate. A cylindrical portion is provided on the downstream surface of the fixed guide plate, and a cylindrical shaft support portion for supporting the rotating shaft of the electric motor is integrally formed in the housing. When the cylindrical portion is press-fitted to the outer periphery of the fan casing and the fan casing is press-fitted to the outer periphery annular cylindrical portion of the fan casing support, the differential user is attached to the fan casing and the return guide vane is press-fitted to the outer periphery of the fan casing. This is achieved by abutting the fan casing supports, respectively.

[Function] A fan casing support formed separately from the motor housing is provided, and a fixed guide plate and a fan casing are provided on this fan casing support, so by selecting the outer circumferential dimension of the fan casing support, The same electric motor can be used for various electric blowers. Furthermore, since the cylindrical part for forming a fitting hole in the center of the fixed guide plate is press-fitted to the outer periphery of the cylindrical shaft support part that is integrally provided in the housing, the air will not flow backward from the press-fitted part. There is no. Furthermore, since the fan casing support is press-fitted to the outer periphery of the motor housing, and the fan casing is press-fitted to the outer circumferential annular cylindrical portion of the fan casing support, the air will not leak to the outside from these fitted parts. do not have. Furthermore, when the fan casing is press-fitted into the outer circumferential annular cylinder part of the fan casing support, the differential user is brought into contact with the fan casing and the return guide vane is brought into contact with the fan casing support. Circulation of the air flow between the ventilation channels separated by the blades and the ventilation distances partitioned by the return guides is prevented.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the electric blower of the present invention will be described with reference to FIG. A commutator type electric motor 1 is formed from a stator 2, a rotor 3, a first housing 4, and a second housing 5. first housing 4,
The flange portion of the second housing 5 is fixed by screws 6, and the condenser 7 is fixed to this flange by screws 71. Rotor 3
A carbon brush 9 is slidably attached to the commutator 8, and the carbon brush 9 is supported by a brush holder 10.
It is attached to the housing 4. Both ends of the rotor 3 are rotatably supported by ball bearings 11 and 12, and the bearings 11 and 12 are fitted and supported by cylindrical bearing supports 13 and 14 of the first housing 4 and the second housing 5, respectively. There is.

The blower section includes a fan casing 17 , a second housing 5 , a fan casing support 18 , and a turbo-type fan 15 driven by a rotating shaft 66 of a rotor 3 in a space formed by these, the fan 15 and the second housing 5 . and a fixed guide plate 16 shown in FIGS. The fan casing support 18 includes a disk portion 19, an outer annular tube portion 20, and an inner annular tube portion 21.
The inner diameter of the inner circumferential annular cylinder portion 21 is formed to have the same dimension as the outer diameter of the second housing 5. Therefore, the fan casing support 18 is attached by press-fitting the inner circumferential annular cylindrical portion 21 to the outer periphery of the housing 5. Further, the inner circumferential annular cylinder portion 21 is
The engaging convex portion 22 protruding inward is connected to the second housing 5.
By fitting the fan casing support 18 into the engagement hole 23 provided in the second housing 5, the fan casing support 18 can be reliably attached to the second housing 5. Fan casing support 1
The outer surface of the disk portion 19 of the fan casing support 18 and the outer surface of the bearing support portion 14 constitute a part of the ventilation path of the blower section, and the upper surface of the disk portion 19 of the fan casing support 18 and the disk portion of the second housing 5 constitute a part of the ventilation path of the fan casing support 18. They are formed on the same plane.

Since the fan casing support 18 is formed separately from the second housing 5 in this way, blower sections having various specifications and sizes can be attached to the electric motor 1. That is, if the size and shape of the inner circumferential annular cylinder part 21 of the fan casing support 18 is made uniform, electric blowers with various specifications can be obtained with the same electric motor by selecting the outer circumferential size thereof. As shown in FIG. 9, a plurality of sector-shaped ventilation holes 24 are formed in the disk portion of the second housing 5 around the bearing support 14, and air is introduced into the electric motor 1 through the ventilation holes 24. .
As shown in FIGS. 1 and 8, the fan casing 17 includes a suction port 25 provided in the center, a conical portion 26, and an annular flat portion 26A formed on the outer peripheral side of the conical portion 26.
and an annular cylindrical portion 2 formed on the outer periphery of the annular flat portion 26A.
It consists of 7. The inner diameter of the annular cylindrical portion 27 is formed to have the same dimension as the outer diameter of the outer circumferential annular cylindrical portion 20 of the fan casing support 18.
At the time of installation, the annular cylindrical portion 27 is press-fitted onto the outer periphery of the outer annular cylindrical portion 20 and fixed. Furthermore, an ear portion 28 is formed on the outer periphery of the fan casing support 18.

When performing maintenance and inspection on the blower section, as shown in FIG. 1
7 can be removed. The fixed guide plate 16 includes a differential user 31 and a differential user, which is made up of a disk-shaped base plate 29, an annular part 30 formed on the outer circumferential side of the base plate 29, and a number of blades formed on the upper surface of the annular part 30. On the opposite side of the guide vane 31, there are a number of return guide vanes 32 extending from the center of the lower surface of the substrate 29 to the lower surface of the annular portion 30. The upper surface of the annular portion 30 on the differential user 31 side is slightly higher than the upper surface of the base plate portion 29. That is, the substrate portion 29 is lower than the annular portion 30. Further, the outer periphery of the differential user 31 slightly protrudes from the outer periphery of the annular portion 30. The upper surface of each blade of the differential user 31 is formed on the same plane without any inclination. The outer diameter of the differential user 31 is formed to be slightly smaller than the inner diameter of the annular cylindrical portion 27 of the fan casing 17.
A cylindrical portion 34 forming a fitting hole 33 is provided on the central lower surface of the base plate portion 29 of the fixed guide plate 16, and is formed to fit into the bearing support portion 14 of the second housing 5. The inner diameter of the fitting hole 33 is formed to have the same diameter as the outer diameter of the bearing support part 14, and the fitting hole 33 is press-fitted or fitted in a close contact state to obtain close contact with the bearing support part 14. be able to. Four positioning tables 40 are formed at equal pitches on the lower surface of the outer peripheral side of the substrate section 29. A conical projection 41 is formed at the tip of the positioning table 40, and the height of the positioning table 40 excluding the projection 41 is equal to or slightly lower than the height of the return guide vane 32.

The disc portion 19 of the fan casing support 18 includes
A hole 42 into which a protrusion 41 is inserted is formed.
The fixed guide plate 16 thus constructed is integrally formed of plastic and is assembled in the following manner. First, the cylindrical portion 3 of the fixed guide plate 16
4 to the bearing support part 14 of the electric motor 1 and press the fixed guide plate 16 to the electric motor 1 side, the fitting hole 33 is press-fitted to the outer periphery of the bearing support part 14, and the fixed guide plate 16 is attached to the electric motor 1. It is temporarily fixed at 1. Then, by inserting the protrusion 41 of the positioning base 40 into the hole 42 of the fan casing support 18, the second housing 5 and the casing support 18 are positioned by the engagement protrusion 22 and the engagement hole 23, so that the return The proper combination of guide vane 23 and ventilation hole 24 can be aligned automatically, accurately, and reliably. When the fixed guide plate 16 is attached, the lower end of the return guide vane 32 abuts against the fan casing support 18 and the disc portion of the second housing 5. As a result, a ventilation passage having a constant width is formed between the lower surface of the fixed guide plate 16 and the disk portions of the fan casing support 18 and the second housing 5.

After installing the fixed guide plate 16, the fan casing 17 is attached to the fan casing support 18, so that the fixed guide plate 16 is completely fixed to the electric motor 1, which will be described below. The fan casing 17 is attached to the electric motor 1 by press-fitting the annular cylindrical portion 27 of the fan casing 17 to the outer periphery of the outer annular cylindrical portion 20 of the fan casing support 18 . In this case, the flat portion 26A of the fan casing 17 causes the differential user 31 to
The upper end surfaces of are brought into contact and strongly pressed. As a result, the fixed guide plate 16 is held between the fan casing 17 and the fan casing support 18 and is securely attached. Note that the outer diameter of the differential user 31 is formed to be slightly smaller than the inner diameter of the annular portion 27 of the fan casing 17, so the outer end of the differential user 31 is connected to the inner circumference of the annular tube portion 27 of the fan casing 17. There is no contact with the department. This means that the fixed guide plate 16 is connected to the bearing support part 14 of the electric motor 1.
The fan casing 17 is centered and fixed by the fitting hole 33 of the cylindrical portion 34.
This means that when the annular cylindrical part 27 and the outer diameter of the differential user 31 come into contact, there is no escape, and by providing a gap between the inner diameter of this annular cylindrical part 27, dimensional variations can be absorbed. .

Since the differential user 31 and the annular flat part 26A abut on a flat surface rather than an inclined surface, they are flexible, and at the same time, the vibration isolating rubber 7 can be attached as shown in FIG.
0's sitting position is also good. In addition, the blades of the ventilation passage partitioned by the blades of the differential user 31 are completely partitioned by the annular flat portion 26A, forming independent ventilation passages. Therefore, airflow circulation between each ventilation passage is prevented, thereby improving aerodynamic performance. A ventilation path is formed between the outer periphery of the annular portion 30 of the fixed guide plate 16 and the annular cylindrical portion 27 of the fan casing 17, and the ventilation path of the differential user 31 and the return guide vane 32 are connected via this ventilation path. The side ventilation passages are connected.

As shown in FIGS. 5 and 6, the fan 15 includes a base plate 60, a suction side plate 61 having an intake port, and a blade 62 disposed between the two. The board 60, the suction side plate 61, and the blade 62 are made of aluminum plates, and the blade 62
The fan 15 is formed by fitting locking protrusions (not shown) formed on the upper and lower ends of the fan into holes provided in the base plate 60 and the suction side plate 61 and crimping them together. Therefore, the outer surfaces of the base plate 60 and the suction side plate 61 are in a state in which the locking projections protrude by the height of the caulking. The height of the outer peripheral end of the fan 15 is formed to be approximately the same as the height of the differential user 31. A guide boss 63 is disposed at the center of the inner surface of the base plate 60 of the fan 15, and a support plate 64 is disposed at the center of the outer side.
4 and a locking protrusion 65 formed on the guide boss 63.
are passed through the substrate 60 and the support plate 64, and the ends of the locking protrusions 65 are caulked to connect and fix. The guide boss 63 is made of zinc die-casting material, has a tapered surface formed on its outer periphery, and has a height slightly higher than the height of the fan 15 on the discharge port side, and also has a rotating shaft 66 of the electric motor 1 inserted therein. A shaft hole 67 is formed. And guide boss 6
A pit hole 68 is formed in the upper end surface of the shaft hole 67 and is concentric with the shaft hole 67.

The fan 15 is fixed to the rotating shaft 66 of the electric motor 1 by fitting the rotating shaft 66 into the shaft hole 67 and screwing a nut 69 into the threaded portion of the rotating shaft 66. Since the nut 69 enters into the pit 68, the amount of protrusion is reduced and the flow of fluid is not obstructed. Since the guide boss 63 is thick, the fan 15
It can be used to adjust the imbalance. In that case,
This is done by feeling a part of the upper surface of the guide boss 63 with a drill. The fan 15 attached to the rotating shaft 66 of the rotor 3 of the electric motor 1 has its base plate 60 placed almost on the same plane as the flat part of the annular portion 30 of the fixed guide plate 16, and the outside of the fan 15 is placed on the same plane as the fixed guide plate 16. 1
Since it is formed to have approximately the same diameter as the substrate portion 29 which is formed lower than the annular portion 30 of No. 6, a certain amount of gap is formed between the substrate 60 and the substrate portion 29. This gap allows the caulking locking protrusion of the blade 62 protruding toward the substrate 60 side of the fan 15 to escape. It goes without saying that the fan 15 is assembled before the fan casing 17 is assembled.

The first housing 4 and the second housing 5 of the electric motor 1 are fixed to screws 6, and the screws 6 are located at the same position as the hole 42 of the fan casing support 18. Therefore, the first housing 4, the second
When the housing 5 is opened and the electric motor 1 is disassembled or maintained or inspected, a screwdriver can be inserted through the hole 42 and the screw 6 can be loosened without removing the fan casing support 18 from the second housing 5. This means that the fan casing support 18 is press-fitted with the second housing 5 and the engagement convex portion 22
Since the fan casing 18 cannot be easily removed since the engaging hole 23 is engaged with the fan casing 18, this is effective when disassembling the electric motor 1 and performing maintenance and inspection.

The electric blower of this embodiment is configured as described above, and by rotating the electric motor 1, the air sucked in from the suction port 25 of the fan casing 17 is transferred to the differential user 31, which is pressurized by the fan 15, and the return air. It passes through the ventilation path of the guide vane 32 and flows into the motor 1 from the ventilation hole 24 of the first housing 5 . In this case, the air pressure in the gap between the base plate 60 of the fan 15 and the base plate portion 29 of the fixed guide plate 16 is lower than that on the return guide vane 32 side. For this reason, if there is a gap between the bearing support part 14 and the fitting hole 33 of the cylindrical part 34, leakage airflow will flow backward through this gap, resulting in curve A showing the aerodynamic characteristics shown by the dotted line in FIG. This reduces performance by 1-3%. However, in the electric blower of this embodiment, the fitting hole 33 of the cylindrical portion 34 is press-fitted into the bearing support portion 14, so that the leakage air flow as described above does not occur, and as shown in FIG. As shown by the solid curve B, a 1 to 3% decrease in performance can be prevented without using packing.

FIG. 11 shows another embodiment, in which the bearing support part 14
A plurality of uneven grooves 72 are provided in the axial direction on the outer periphery. Therefore, even if the dimensions of the fitting hole 33 vary and the fitting hole is somewhat small, the fitting hole 33
The remaining inside can enter into the concave portion of the uneven groove 72, and the cylindrical portion 34 has the advantage of being able to be press-fitted stably without cracking, and has the same effects as the above-mentioned embodiments.

[Effects of the Invention] As described above, according to the present invention, the fan casing support is provided separately from the motor housing,
Since the fixed guide plate and the fan casing are attached to this fan casing support, various electric blowers can be obtained with the same electric motor, and the fan casing support is press-fitted to the outer periphery of the motor housing, and the fixed guide plate Press-fit the cylindrical portion of the housing to the outer periphery of the shaft support portion of the housing, and
When the fan casing is press-fitted into the outer annular cylinder part of the fan casing support, the differential user is brought into contact with the fan casing, and the return guide vane is brought into contact with the fan casing support, thereby preventing backflow of air. In addition, an electric blower with excellent air blowing efficiency is obtained in which leakage of air from the fitting portion between the fan casing and the fan casing support and the fitting portion between the fan casing support and the motor housing is prevented.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the electric blower of the present invention, FIG. 2 is a plan view of the fixed guide plate of the blower in FIG. 1, FIG. 3 is a longitudinal sectional view of FIG. The figure is a bottom view of the fan shown in Fig. 2, Fig. 5 is a plan view of the fan shown in Fig. 1, Fig. 6 is a longitudinal cross-sectional view of the fan shown in Fig. 5, and Fig. 7 is the fan casing shown in Fig. 1 when the anti-vibration rubber is installed. 8 is a partially cutaway perspective view of the fan casing support and electric motor shown in FIG. 1, FIG. 10 is a perspective view of the fan casing support and electric motor shown in FIG. FIG. 11, which is a curve diagram showing the aerodynamic characteristics of the blower, is a perspective view of a bearing support portion of another embodiment of the electric blower of the present invention. 1... Electric motor, 5... Second housing, 14...
...Bearing support part, 15...Fan, 16...Fixed guide plate, 17...Fan casing, 18...Fan casing support, 20...Outer circumference annular cylinder part, 24
...Vent, 31...Diff user, 32...
Return guide vane, 33... Fitting hole, 34...
... Cylinder part, 65 ... Rotating shaft.

Claims (1)

[Claims] 1 An electric motor 1 having a housing 5 provided with a plurality of ventilation holes 24, a fan casing support 18 press-fitted to the outer periphery of the housing 5, and a fan casing support 18 provided above the fan casing support 18 and the housing 5. a fixed guide plate 16 and a turbo fan 15 provided above the fixed guide plate 16.
and a fan casing 17 that covers the fan 15 and the fixed guide plate 16 and is press-fitted into the outer peripheral annular cylinder part 20 of the fan casing support 18, and the fixed guide plate 16 has an upstream side surface thereof. A differential user 31 is provided on the outer periphery of the fan, and a return guide vane 32 is provided on the downstream side of the fan. In the electric blower introduced into the electric motor 1, the fixed guide plate 1
Cylindrical portion 34 for forming a fitting hole 33 in the center of 6
is provided on the downstream side surface of the fixed guide plate 16, and a cylindrical shaft support part 14 for supporting the rotating shaft 65 of the electric motor 1 is integrally formed in the housing 5. When the cylindrical portion 34 is press-fitted to the outer periphery of the shaft support portion 14 and the fan casing 17 is press-fitted to the outer periphery annular cylindrical portion 20 of the fan casing support 18, the differential user 31 is inserted into the fan casing support 18. In the casing 17,
An electric blower characterized in that the return guide vanes 32 are brought into contact with the fan casing supports 18, respectively.