JPS6060040B2 - electric blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electric blower suitable for use in a domestic vacuum cleaner.

[Background of the invention]

This type of electric blower is designed so that blowers with various specifications can be obtained using the same electric motor, and in order to enable automatic assembly.
A configuration has been developed in which the housing of the electric motor is divided into two parts, a first housing part and a second housing part, and a separate fan casing support is press-fitted into the second housing part.

The electric blower under development is constructed by stacking the parts that make up the electric blower one after another and moving and tightening the screws that fix the first housing part and the second housing part from the top to the bottom. Therefore, attempts have been made to achieve automatic assembly using gravity. However, with the above configuration, in order to disassemble the electric motor when repairing the electric motor, etc., it is necessary to use a screwdriver to remove the screws that fix the first housing part and the second housing part to the fan casing support. It is necessary to provide a hole for inserting the

However, since the fan casing support becomes the flow path wall of the blower section, at least when the blower section is assembled,
If the hole is provided in the fan casing support, it is necessary to close the hole. Furthermore, the return guide vane provided on the fixed guide plate and the second housing part need to have a predetermined positional relationship in terms of aerodynamic performance. [Object of the Invention] An object of the present invention is that even if the fan casing support is provided with a hole for inserting a screwdriver for removing the screw fixing the first housing part and the second housing part, the hole cannot be inserted into the blower part. The present invention is to provide an electric blower that can be closed off when the assembly is completed and that the fixed guide plate can be positioned at the same time.

[Summary of the invention]

The present invention is characterized by: an electric motor having a housing divided into two parts, a first housing part and a second housing part; a fan casing support press-fitted into the second housing of the electric motor; a fan casing press-fitted to a fan casing support; a fan disposed between the fan casing and the fan casing support and attached to the rotating shaft of the electric motor; placed between
and a fixed guide plate clamped and fixed between the fan casing and the fan casing support, a return guide vane provided on the back surface of the fixed guide plate and guiding airflow to the ventilation hole of the second housing part, and the second housing part. In the electric blower, the fan casing support has a hole for inserting a screwdriver that turns the screw, and a screw for tightening and fixing both flanges of the first housing part and the second housing part. In addition, the fixed guide plate is provided with a positioning base that fits into the hole, so that the position of the hole provided in the fan casing support and the fixed guide plate can be adjusted to match the position of the blower. This can be done simultaneously when the parts are assembled.

[Embodiments of the invention]

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

In the drawings, commutator motor 1 (hereinafter referred to as motor)
is composed of a stator 2, a rotor 3, and a housing. The housing is composed of a first housing part 4 and a second housing part 5. Both housing parts 4, 5 are fastened to flanges with screws 6, and the condenser is attached to the flanges with screws 7. A carbon brush 9 is slidably attached to the commutator 8 of the rotor 3, and the carbon brush 9 is supported by a brush holder 10.

The brush holder 10 is attached to the first housing part 4. Both ends of the rotor 3 are rotatably supported by shafts 11 and 12 of ball bearings.

Both bearings 11 and 12 are fitted and attached to cylindrical bearing support parts 13 and 14 of both housing parts 4 and 5.
The blower section includes a turbo fan 15, a fixed indoor board 16, a fan casing 17, and a fan casing support 18.

The fan 15 and the fixed guide plate 16 are connected to the fan casing 1
7 and a fan casing support 18. The fan casing support 18 is composed of a disk portion 19, an outer annular cylindrical portion 20, and an inner annular cylindrical portion 21.

The inner circumferential annular cylindrical portion 21 and the inner diameter are formed to have the same dimensions as the outer diameter of the second housing 5. For this purpose, the fan casing support 18 is attached by press-fitting the inner circumferential annular cylindrical portion 21 to the outer circumference of the housing 5 .
The inner circumferential annular cylindrical portion 21 is provided with an engaging convex portion 22 that protrudes inward, and the housing 5 is formed with an engaging hole 23, so that the fan casing is supported by engagement between the two. 18 is securely attached to the housing 5.
The outer surface of the disc part 19 of the fan casing support 18 and the bearing support part 14 constitute a part of the ventilation path of the blower part, and the upper surface of the disc part 19 of the fan casing support 18 and the disc part of the housing 5 The parts are placed on the same plane.

As described above, the fan casing support 18 is formed separately from the housing 5, so that the fan casing support 18 is
It is possible to install blower sections of various sizes with various specifications.

That is, by using the same electric motor 1, it is possible to construct blower motors with various specifications.In other words, if the dimensions and shape of the inner circumferential annular cylinder portion 21 of the fan casing support 18 are made uniform, this outer circumferential dimension can be Depending on the selection, it is possible to obtain blower motors with various specifications using the same motor.A ventilation hole 24 is formed in the disk portion of the housing 5, and air is blown into the inside of the motor 1 from here. will be done.

The fan casing 17 is composed of a suction port 25 provided in the center, a conical part 26, an annular flat part 26a formed on the outer periphery of the conical part 26, and an annular cylindrical part 27 formed on the outer periphery of the annular flat part 26a. has been done.

The inner diameter of the annular cylindrical portion 27 is the same as that of the fan casing support 18.
It is formed to have the same outer diameter as the outer peripheral annular cylinder portion 20 of.

An ear portion 28 is formed on the outer periphery of the fan casing support 18. The fan casing 17 is attached by press-fitting the annular cylindrical portion 27 to the outer periphery of the outer annular cylindrical portion 20 of the fan casing support 18 .

When maintaining or inspecting the blower section, use a screwdriver as shown in Fig. 8, insert it into the pry ear 28 and the end of the annular tube section 27 of the fan casing 17, and turn it in the direction of the arrow. By doing so, the fan casing 17 can be removed. The fixed guide plate 16 has a disk-shaped base plate 29
an annular portion 30 formed on the outer periphery of the substrate portion 29; a diffuser 31 (consisting of a large number of blades) formed on the upper surface of the annular portion 30; It is composed of a large number of return guide vanes 32 extending over the lower surface of the annular portion 30. The upper surface of the annular portion 30 on the diffuser 31 side is approximately 3W lower than the upper surface of the substrate portion 29! It's going up. In other words, the substrate portion 29 is one step lower than the annular portion 30. The outer periphery of the diffuser 31 protrudes from the outer periphery of the annular portion 30 by about 2.5 w$t. Further, the upper surface of the diffuser 31 is flush and has a flat surface, that is, a non-slanted surface. The outer diameter of the diffuser 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 33 is formed on the lower center surface of the base plate portion 29 of the fixed guide plate 16 . An annular inner ring portion 34 is formed at the bottom of the cylindrical portion 33 . A small-diameter cylindrical portion 35 is formed on the lower center surface of the annular inner flange portion 34 . Four ribs 36 are formed at equal pitches on the inner circumferential surface of the cylindrical portion 33. The inner diameter of the rib 36 (the inner diameter of the circle connecting the inner ends of each rib 36) is made to match the outer diameter of the cylindrical bearing support portion 14 that supports the bearing 12. A locking portion 38 is formed by cutting out the cylindrical portion 33, and a locking pawl 39 is formed on the inner surface of the tip of the locking portion 38.

The height of the small diameter cylindrical portion 35 is made to substantially match the depth of the recess 37 formed at the base of the bearing support portion 14. Four positioning tables 40 are formed at equal pitches on the lower surface of the outer peripheral side of the disc portion 19.

A conical projection 41 is formed at the tip of the positioning table 40. The height of the positioning table 40, excluding the protrusion 41, is set to be the same as or slightly lower than the height of the return guide vane 32. The overall height of the positioning table 40 is formed to be more than enough higher than the height of the locking claw 39.

A hole 42 into which the protrusion 41 is inserted is formed in the disk portion 19 of the fan casing support 18 . This hole 42
As shown in FIGS. 1 and 9, is provided at a position corresponding to the screw 6, and is set to a size that allows the screw 6 to be turned with a driver 71. The fixed guide plate 16 having the above configuration is integrally formed of plastic and is assembled in the following manner.

That is, the cylindrical part 33 of the fixed guide plate 16 is aligned with the bearing support part 14 of the electric motor 1, and the fixed guide plate 16 is aligned with the bearing support part 14 of the electric motor 1.
By pressing it toward the side, the fixed guide plate 16 is fixed to the electric motor 1 side using the rib 36 as a guide on the outer periphery of the bearing support part 14. The fixed guide plate 16 is assembled in this way, and the positioning table 40 has the following function.

That is, the positioning table 40 ensures the alignment of the locking piece 38 and the ventilation hole 24, and the fixed guide plate 16
is completely incorporated into the electric motor 1.

By assembling the fixed guide plate 16 so that the protrusion 41 of the positioning base 40 is inserted into the hole 42, the locking claw 39 of the locking piece 38 is locked to the inner diameter end of the ventilation hole 24.

This automatically ensures accurate insertion. If the positioning base 40 and the hole 42 are not aligned, the protrusion 41 will come into contact with the fan casing support 18 and the tip of the locking piece 38 will not come into contact with the bearing support 14.

If the positioning stand 40 is not provided, the tip of the locking piece 38 will be strongly pressed against the fan casing support 18, and the locking piece 38 will be bent and damaged. In this way, the fixed guide plate 16 is centered on the central rib 36 of the electric motor 1, and can be prevented from moving in the radial direction by engagement with the positioning table 40 and the hole 42.

When the fixed guide plate 16 is attached, the lower end of the return guide vane 32 is connected to the fan casing support 1.
8 and the bearing support portion 14 .

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 portion 19 of the fan casing support 18 and the disk portion of the 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.

I will discuss this in detail. 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 . The annular flat portion 26a of the fan casing 17 contacts and strongly presses against the upper end surface of the diffuser 31. By this,
The fixed guide plate 16 is held between the fan casing 17 and the fan casing support 18 and is securely attached.
Since the outer diameter of the diffuser 31 is formed to be slightly smaller than the inner diameter of the annular cylindrical portion 27 of the fan casing 17, the outer end of the diffuser 31 is connected to the fan casing 17.
Do not collide with the inner circumference of the cylindrical part.

This means that the fixed guide plate 16 is connected to the bearing support part 14 of the electric motor 1.
Since it is centered by the rib 36, the outer diameter of the diffuser 31 and the annular . By providing a gap with the inner diameter of the cylindrical portion 27, dimensional variations can be absorbed.

The diffuser 31 and the annular flat portion 26a are flat surfaces (not sloped surfaces).

) makes it easy to sit. At the same time, the anti-vibration comb 70 installed as shown in FIG. 7 can sit comfortably. Each blade of the ventilation path partitioned by the blades of the diffuser 31 is completely partitioned.

Therefore, the circulation of the airflow is blocked together with the annular tube portion 27 of the fan casing 17, and aerodynamic performance is improved. A ventilation passage is formed between the outer periphery of the annular pond 30 of the fixed guide plate 16 and the annular cylinder portion 27 of the fan casing 17, and the diffuser 31 is
The ventilation passage on the return guide vane 32 side is in communication with the ventilation passage on the return guide vane 32 side.

The fan 15 includes a substrate 60 and a suction side plate 6 having a suction port.
1 and a blade 62 disposed between them.The substrate 60, the suction side plate 61, and the blade 62 are made of aluminum plates, and are formed at the upper and lower ends of the blade 62. The fan 15 is formed by fitting the locking protrusions (shown) into holes provided in the substrate 60 and the suction side plate 61 and caulking them, thereby integrating the three.

Locking protrusions are placed on the outer surfaces of the base plate 60 and the suction side plate 61 in a slightly protruding state. The height of the outer peripheral end of the fan 15 is formed to be approximately the same as the height of the diffuser 31.

A guide boss 63 is located at the center of the inner surface of the board 60 of the fan 15.
A support plate 64 is disposed at the center of the outside, and the guide boss 63 and the support plate 64 are connected and fixed by sandwiching the board 60.

This is done by passing the locking projection 65 formed on the guide boss 63 through the substrate 60, passing through the locking projection 65 and the support plate 64, and closing the tip of the locking projection 65. . The guide boss 63 is made of zinc die-cast material, and has a tapered surface formed on its outer periphery. The height of the guide boss 63 is formed to be slightly higher than the height of the fan 15 on the discharge side. The guide boss 63 is formed with a shaft hole 67 into which the rotating shaft 66 of the electric motor 1 is inserted. A pit hole 68 is formed at the upper end of the guide boss 63 so as to be concentric with the shaft hole 67 .

The fan 15 has a shaft hole 67 fitted into the rotating shaft 66.
The fan 15 is fixed to the rotating shaft 66 of the electric motor 1 by fitting a nut 69 to the threaded portion of the fan 15 . nut 69
Since it enters the pit 68, the amount of protrusion is reduced, and the flow of fluid is not obstructed. Since the guide boss 63 is thick, it can be used to adjust the imbalance of the fan 15.

In other words, the unbalance can be adjusted by hollowing out a portion of the upper surface 63a of the guide boss 63 with a drill.
The fan 15 is attached to the rotor 3 side of the electric motor 1, and its base plate 60 is placed substantially flush with the annular portion 30 of the fixed guide plate 16. The outer periphery of the fan 15 is a fixed guide plate 16
The diameter is approximately the same as that of the substrate portion 29. Since the base plate 60 of the fan 15 is placed flush with the annular portion 30 of the fixed guide plate 16, a certain amount of gap is formed between the base plate 6C and the base plate portion 29.

This gap allows the caulking locking protrusion of the blade 62 protruding toward the board 16 side of the fan 15 to escape. Both housings 4 and 5 of the electric motor 1 are tightened with screws 6, and the screws 6 are attached to the fan casing support 1.
It is positioned in the hole 42 of No.8.

When the housings 4 and 5 are opened and the motor 1 is disassembled, maintained, or inspected, a screwdriver can be inserted through the hole 42 as shown in FIG. 9, so the screw 7 can be loosened without removing the fan casing support 18 from the housing 5. be able to. Since the fan casing support 18 is press-fitted and the engagement protrusion 22 and the engagement hole 23 are engaged, the fan casing support 18 cannot be easily removed.

Therefore, the electric motor 1 can be disassembled, maintained, and inspected without removing the fan casing support 18. As described above, the blower motor is composed of the motor 1 and the blower section, and by rotating the motor 1, the airflow sucked from the suction port 25 of the fan casing 17 flows through the inside of the motor 1. and is exhausted to the outside of the motor 1.

The high-pressure airflow discharged from the fan 15 flows into the electric motor 1 through the ventilation hole 24 of the bearing support part 14 via the ventilation path of the diffuser 31 and the return guide vane 32.

However, a small portion of the high pressure airflow returns to the upstream side within the blower section. That is, the board 60 of the fan 15 and the fixed guide plate 1
The air pressure on the side of the gap with the base plate 29 of 6 is lower than that on the return guide vane 32 side.
It flows backwards from the small gap between 3 and 3. If there is no backflow from this small gap, a portion of the high-pressure airflow that has flowed into the motor 1 will flow back through the bearing 12 to the upstream side of the blower section.

This electric blower is used for a vacuum cleaner, and the high-pressure airflow contains fine dust, so if the air flows backward through the bearing 12, the inside of the bearing 12 will be contaminated by the fine dust. At the same time, the lubricating oil inside the bearing 12 flows out due to the reverse flow, thereby deteriorating the bearing performance. However, the locking piece 38 and the cylindrical part 3
Since the back flow is made to occur through the small gap between the bearing and the bearing, it is possible to prevent such deterioration of the bearing performance.

Since the air pressure on the return guide vane 32 side of the fixed guide plate 16 is higher than the air pressure on the gap side formed by the disc part 29 and the base plate 60 of the fan 15, the fixed guide plate 16 is lower than the bearing support part 14. Receives force in the direction of separation.

However, since the fixed guide plate 16 is locked to the bearing support portion 14 side by the locking claw 39 of the locking piece 38, the center of the fixed guide plate 16 is reliably held.

Of course, since the fixed guide plate 16 is pressed against the upper surface of the diffuser 32 by the fan casing 17, it will not float up. Fan 15 guide boss 6
Since the outer periphery of the blade 3 has a tapered surface, the airflow flowing in from the suction port 25 smoothly flows toward the inlet side of the blade. Therefore, fan performance is improved. The fixed guide plate 16 has ribs 36 and supports the bearing support part 1 of the electric motor 1.
4, the dimensional accuracy between the outer periphery of the fan 15 and the inner periphery of the diffuser 31 can be improved, and the fan effect can be improved.

〔Effect of the invention〕

As described above, according to the present invention, there is provided an electric motor having a housing divided into two parts, a first housing part and a second housing part, and a fan formed by press-fitting into the second housing of the electric motor. a casing support; a fan casing press-fitted into the fan casing support; a fan disposed between the fan casing and the fan casing support and attached to the rotating shaft of the electric motor; A fixed guide plate disposed between the fan casing support and clamped and fixed between the fan casing and the fan casing support; a return guide vane for guiding the first
In the electric blower, the fan casing support has a hole for inserting a screwdriver that turns the screw, and the fan casing support has a hole for inserting a screwdriver that turns the screw. In addition to providing the fixed guide plate at the corresponding position, the fixed guide plate is provided with a positioning base that fits into the hole, so that the fan casing support can be
Even if a hole is provided for inserting a screwdriver to remove the screw that fixes the first housing part and the second housing part,
It is possible to provide an electric blower in which the hole can be closed when the blower section is assembled and the fixed guide plate can be positioned at the same time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of an electric blower, FIG. 2 is a plan view of a fixed guide plate, FIG. 3 is a longitudinal cross-sectional view of a fixed guide plate, and FIG. The figures are a bottom view of the fixed guide plate, Figure 5 is a plan view of the fan, Figure 6 is a vertical sectional view of the fan, Figure 7 is a vertical sectional view of the fan casing and anti-vibration rubber, and Figure 8 is a partially cutaway view. FIG. 9 is a perspective view of the blower section, and FIG. 9 is a perspective view showing the fan casing support and the electric motor. 1... Electric motor, 4... Housing part,
5... Housing part, 6... Screw, 1
5...Fan, 16...Fixed guide plate, 17...
...Fan casing, 18...Fan casing support, 24...Ventilation hole, 32...
Return guide vane, 40...Positioning base,
42...hole.

Claims (1)

[Claims] 1 an electric motor 1 having a housing divided into two parts, a first housing part 4 and a second housing part 5; a fan casing support 18 press-fitted into the second housing 5 of the electric motor 1; This fan casing support 1
a fan casing 17 press-fitted into the motor 1; a fan 15 disposed between the fan casing 17 and the fan casing support 18 and attached to the rotating shaft of the electric motor 1; A fixed guide plate 16 disposed between the fan casing support 18 and clamped and fixed between the fan casing 17 and the fan casing support 18, and a second housing part provided on the back surface of the fixed guide plate 16. Ventilation hole 24 provided in 5
In the electric blower, the fan casing support 18 includes a return guide vane 32 that guides airflow to the fan casing support 18, and a screw 6 that tightens and fixes both the flanges of the first housing part 4 and the second housing part 5. , a hole 42 for inserting a screwdriver to turn the screw 6 is inserted into the screw 6.
and the fixed guide plate 16.
An electric blower characterized in that a positioning stand 40 that fits into the hole 42 is provided.