JPS6213519B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric blower, and particularly to an electric blower suitable for use in household vacuum cleaners and the like.

[Conventional technology]

In this type of electric blower, JP-A-51-
As shown in Publication No. 99309, the fixed guide plate is directly fixed to the motor housing (end bracket) with screws, and the fan casing is fitted and fixed to the motor housing (end bracket). .

Furthermore, the fan casing 17 shown in the above-mentioned publication has a conical inclined surface, and the upper end of a spiral differential user blade provided on a fixed guide plate is brought into contact with this inclined surface.

[Problem that the invention seeks to solve]

In the conventional example described above, since the fixed guide plate is directly attached to the housing of the electric motor, there is a problem that blower sections of various sizes and specifications cannot be attached to one electric motor.

Furthermore, on the conical inclined surface of the fan casing,
In order to make the upper ends of the spiral blades that are provided on the fixed guide plate and make up the differential user come into close contact,
There is a problem in that the upper end of the blade needs to be a complicated three-dimensional curved surface along a conical slope, making it extremely difficult to manufacture the fixed guide plate.

The present invention makes it possible to attach blower parts of various sizes with various specifications to one electric motor, and also allows the fan casing and the upper end of the blade to be easily brought into close contact with each other without making the upper end of the blade of the diffuser user into a complicated shape. To provide an electric blower which is easy to manufacture, can prevent airflow circulation between blades, and can smoothly introduce airflow from a fan into an electric motor.

[Means for solving 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 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; is formed from a base plate, a suction side plate having a suction port, and a blade disposed between the two, and the fixed guide plate is formed on a disc-shaped base plate and on the outer periphery of this base plate. a diff user comprising an annular part, a sloped step part formed at the boundary between the annular part and the substrate part to raise the annular part one step above the substrate part, and a plurality of blades formed on the upper surface of the annular part. and a return guide vane formed on the lower surface of the annular part and the base plate part, and an electric blower in which airflow from the fan is introduced into the motor from the vent hole via the differential user and the return guide vane. The fan casing includes a conical part having a suction port in the center, and an annular flat part extending through an inclined step part on the outer periphery of the conical part.
The upper end of the differential user is
A flat surface that closely contacts the inner surface of the annular flat part of the fan casing, and further, the suction port of the suction side plate is connected to the suction port of the fan casing, and the outer periphery of the fan is connected to the inner periphery of the differential user. This is achieved by making the base plate of the fan and the annular portion of the fixed guide plate face each other and flush with each other.

[Effect]

A fan casing support is provided that is formed separately from the motor housing, and a fixed guide plate and fan casing are provided on this fan casing support. Can be used with various electric blowers.

Furthermore, the fan casing includes a conical part having a suction port in the center, an annular flat part extending through an inclined step part on the outer periphery of the conical part, and an annular cylindrical part formed on the outer periphery of the annular flat part. In addition, the upper end of the blade of the differential user is a flat surface that closely contacts the inner surface of the annular flat part of the fan casing, and the fan casing is press-fitted to the fan casing support. The upper ends of the blades of the diff user are brought into close contact with the inner surface of the annular flat portion and are strongly pressed, and the blades of the diff user are completely partitioned, thereby preventing airflow from circulating between the blades.

Further, the suction port of the suction side plate faces the suction port of the fan casing, and the outer periphery of the fan faces the inner periphery of the differential user. are flush with each other, so there is less turbulence in the airflow, the airflow from the fan flows smoothly from the diff user to the return guide vane side, and the space between the fan base plate and the base plate of the fixed guide plate is wide. Therefore, even if the locking protrusion for caulking the blade protrudes from the outer surface of the board of the fan, the locking protrusion does not come into contact with the fixed guide plate.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the drawings, a commutator motor 1 (hereinafter referred to as the motor) is composed of a stator 2, a rotor 3, and a housing. The housing is the first
It is composed of a housing part and a second housing part 5. Both housing parts 4 and 5 are fastened to flanges with screws 6. The condenser 7 is attached to the flange 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 ball bearings 1
Rotatably supported at 11 and 12, both bearings 1
1 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 guide plate 16, a fan casing 17, and a fan casing support 18. The fan 15 and the fixed guide plate 16 are arranged in a space formed by a fan casing 17 and a fan casing support 18.

The fan casing support 18 is composed of a disk portion 19, an outer circumferential annular tube portion 20, and an inner circumferential annular tube portion 21. The inner diameter of the inner annular cylinder 21 is 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 periphery of the housing 5. In addition, the inner circumferential annular cylinder portion 21
is provided with an engaging protrusion 22 that protrudes inward, and the housing 5 is formed with an engaging hole 23, so that the fan casing support 18 is securely attached to the housing 5 by engagement between the two. It will be done.

The outer surface of the disc part 19 and the bearing support part 14 of the fan casing support 18 constitute a part of the ventilation passage of the blower part, and the fan casing support 18
The upper surface of the disk portion 19 of the housing 5 and the disk portion of the housing 5 are placed on the same plane.

As described above, since the fan casing support 18 is formed separately from the housing 5, blower sections of various sizes and specifications can be attached to the electric motor 1. In other words, the same electric motor 1 can be used to construct blower motors with various specifications. That is, if the dimensions and shape of the inner circumferential annular cylinder part 21 of the fan casing support 18 are made uniform, by selecting the outer circumferential dimension, it is possible to obtain blower motors with various specifications using the same motor. It is.

A ventilation hole 24 is formed in the disc portion of the housing 5, through which air is blown into the inside of the electric motor 1.

The fan casing 17 includes a suction port 25 provided in the center, a conical part 26, an annular flat part 26' 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 26'. It consists of A stepped portion 27' is formed at the connecting portion between the outer circumferential portion of the conical portion 26 and the annular flat portion 26'. The stepped portion 27' is a slope. A small gap is provided between this stepped portion 27' and the upper edge of the outer periphery of the fan 15.

The inner diameter of the annular cylindrical portion 27 is formed to be the same as the outer diameter of the outer circumferential annular cylindrical portion 20 of the fan casing support 18 . Furthermore, a pry-opening 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 22 of the fan casing support 18 .

When maintaining or inspecting the blower section, use a screwdriver to pry open the ears 28 as shown in Figure 8.
The fan casing 17 can be removed by inserting it into the end of the annular cylinder portion 27 of the fan casing 17 and turning it in the direction of the arrow.

The fixed guide plate 16 includes a disk-shaped base plate 29, an annular part 30 formed on the outer periphery of the base plate 29, and a differential user 31 (consisting of a large number of blades) formed on the upper surface of the annular part 30. and a large number of return guide vanes 32 extending from the center of the lower surface of the base plate section 29 to the lower surface of the annular section 30 on the opposite surface of the differential user 31.

The upper surface of the annular portion 30 on the side of the differential user 31 is higher than the upper surface of the base plate portion 29 by about 3 mm. In other words, the substrate portion 29 is one step lower than the annular portion 30. This stepped portion 30' is a slope. The outer circumference of the differential user 31 is approximately smaller than the outer circumference of the annular portion 30.
It protrudes 2.5mm. Also, Diff user 31
The top surface of is flush and has a flat surface, that is, a non-slanted surface. Furthermore, Diff user 31
The outer diameter of the fan casing 17 is 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 flange portion 34 is formed at the bottom of the cylindrical portion 33 . A small-diameter cylindrical portion 35 is formed at the center lower surface of the annular inner flange portion 34 . Four ribs 36 are formed at equal pitches on the inner peripheral 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 piece 38 is formed by cutting out the cylindrical portion 33, and a locking claw 39 is formed on the inner surface of the tip of the locking piece 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.

A positioning table 40 is provided on the lower surface of the outer peripheral side of the board portion 29.
are formed at equal pitches. Positioning stand 4
A conical projection 41 is formed at the tip of the 0. The height of the positioning base 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. Note that a hole 42 into which the projection 41 is inserted is formed in the disk portion 19 of the fan casing support 18.

The fixed guide plate 16 having the above structure is integrally formed of plastic and is assembled in the following manner.

That is, by aligning the cylindrical part 33 of the fixed guide plate 16 with the bearing support part 14 of the electric motor 1 and pressing the fixed guide plate 16 against the electric motor 1 side, the rib 36 is fixed to the outer periphery of the bearing support part 14 as a guide. The guide plate 16 is fixed to the electric motor 1 side.

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,
The fixed guide plate 16 is completely incorporated into the electric motor 1.

By incorporating 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 correct insertion.

If the positions of the positioning table 40 and the hole 42 do not match,
The protrusion 41 contacts the fan casing support 18,
The tip of the locking piece 38 is placed in a state where it does not come into contact with the bearing support part 14. If the positioning table 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 at the center of the electric motor 1 with the rib 36, and can be prevented from moving in the radial direction by engaging 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 abuts against the fan casing support 18 and the bearing support 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.

By press-fitting the annular cylindrical portion 27 of the fan casing 17 to the outer periphery of the outer annular cylindrical portion 22 of the fan casing support 18, the fan casing 17
is attached to the electric motor 1 side. The annular flat part 26' of the fan casing 17 is connected to the differential user 3.
1 and press it firmly. As a result, the fixed guide plate 16 is held between the fan casing and the fan casing support 18, and is securely attached.

In addition, since 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, the outer end of the differential user 31 is connected to the inner circumference of the cylindrical portion of the fan casing 17. Do not collide with the

This is because the fixed guide plate 16 is centered by the bearing support part 14 of the electric motor 1 and the rib 36, so conversely, a gap is created between the outer diameter of the differential user 31 and the inner diameter of the annular cylinder part 27. By this,
Can absorb dimensional variations.

Since the differential user 31 and the annular flat portion 26' abut on a flat surface (not an inclined surface), the user can sit comfortably. At the same time, the anti-vibration rubber 70 attached as shown in FIG. 7 has a good seating position.

Moreover, the blades of the ventilation path partitioned by the blades of the differential user 31 are completely partitioned. Therefore, the circulation of the airflow is blocked together with the annular cylinder portion 27 of the fan casing 17, so that aerodynamic performance is improved.

A ventilation passage is formed between the outer periphery of the annular part 30 of the fixed guide plate 16 and the annular cylindrical part 27 of the fan casing 17, and the ventilation passage of the differential user 31 and the return guide vane 32 side are connected via this ventilation passage. The ventilation ducts are connected.

The fan 15 is composed of a base plate 60, a suction side plate 61 having a suction port, and a blade 62 disposed between the two.

The base plate 60, the suction side plate 61, and the blade 62 are made of aluminum plates, and locking protrusions (not shown) formed at the upper and lower ends of the blade 62 are fitted into holes provided on the base plate 60 and the suction side plate 61. The fan 15 is formed by caulking and integrating the three parts. 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 edge of the fan 15 is the differential user 3.
It is formed to have almost the same height as 1.

A guide boss 63 is provided at the center of the inside surface of the base plate 60 of the fan 15, and a support plate 64 is provided at the center of the outside.
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 crushing 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. Guide boss 63
A shaft hole 67 is formed in which a rotating shaft 66 of the electric motor 1 is inserted.

A pit hole 68 formed concentrically with the shaft hole 67 is provided in the upper end surface of the guide boss 63 .

The fan 15 is fixed to the rotating shaft 66 of the electric motor 1 by fitting the shaft hole 66 into the rotating shaft 67 and screwing the nut 69 into the threaded portion of the rotating shaft 66. Since the nut 69 fits 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, it can be used to adjust the imbalance of the fan 15. That is, the unbalance can be adjusted by feeling a portion of the upper surface of the guide boss 63 with a drill.

Fan 1 attached to the rotor 3 side of electric motor 1
5, its base plate 60 is placed substantially flush with the annular portion 30 of the fixed guide plate 16. Also, Juan 1
The outer periphery of the guide plate 5 has approximately the same diameter as the base plate portion 29 of the fixed guide plate 16.

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 60 and the base plate portion 29. This gap allows the caulking locking protrusion of the blade 62 protruding toward the substrate 16 side of the fan 15 to escape.

Both housings 4 and 5 of the electric motor 1 are fastened with screws 7, which are positioned in holes 42 in the fan casing support 18. When the housings 4 and 5 are opened to disassemble, maintain, or inspect the electric motor 1, a screwdriver can be inserted through the hole 42, so the screw 7 can be loosened without removing the fan casing support 18 from the housing 5.

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, it is particularly necessary to disassemble, maintain and inspect the electric motor 1 without removing the fan casing support 18.

As described above, the electric blower is composed of the electric motor 1 and the blower section, and by rotating the electric motor 1, the gas sucked from the suction port 25 of the fan casing 17 flows inside the electric motor 1, and 1 is exhausted outside.

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

However, a small portion of the high pressure gas returns to the upstream side within the blower section. That is, the air pressure on the gap side between the base plate 60 of the fan 15 and the base plate portion 29 of the fixed guide plate 16 is lower than on the return guide vane 32 side. For this reason, the water flows backward through the small gap between the locking piece 38 and the cylindrical portion 33.

If there is no backflow from this small gap, a portion of the high-pressure gas 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 vacuum cleaners.
Since high-pressure gas contains fine dust, bearing 1
When the inside of the bearing 12 is reversed, the inside of the bearing 12 becomes dirty with 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, since the backflow is allowed to occur through the small gap between the locking piece 38 and the cylindrical portion 33, such deterioration of bearing performance can be prevented.

Further, 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 disk portion 29 and the base plate 60 of the fan 15, the fixed guide plate 16 Receives force in a direction that moves away from you.

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, the fixed guide plate 16 is the differential user 32.
Since the upper surface of the fan casing 17 is pressed against the fan casing 17, the fan casing 17 does not lift up.

Further, since the outer periphery of the guide boss 63 of the fan 15 is formed with a tapered surface, the gas flowing in from the suction port 25 smoothly flows toward the blade inlet side. Therefore, fan performance is improved.

Furthermore, since the fixed guide plate 16 has ribs 36 and is centered on the bearing support part 14 of the electric motor 1, the dimensional accuracy between the outer circumference of the fan 15 and the inner circumference of the differential user 31 can be improved, and the fan effect is improved. can be raised.

Furthermore, since the blades 62 of the fan 15 and the blades of the differential user 31 are approximately the same in height, the airflow discharged from the fan 15 smoothly flows into the differential user 31 without being suddenly expanded. I can do it. Loss caused by expansion and turbulence of airflow can be kept to a minimum.

Furthermore, the stepped portion 27' of the fan casing 17 is sloped, and even if there is a difference in height between the side plate 62 on the suction side of the fan 15 and the annular portion 26' of the fan casing 17, the airflow will collide with the slope. So there is less loss.

Further, the upper edge of the outer periphery of the fan 15 is formed by the stepped portion 27'.
They face each other with a small gap. Since this small gap provides a labyrinth effect as a fluid, leakage of the airflow circulating to the fan suction port through the gap between the fan suction side plate 61 and the fan casing conical portion 26 can be suppressed to a minimum. This improves aerodynamic performance.

Because of the above-mentioned labyrinth effect, aerodynamic performance will not deteriorate even if the distance between the conical portion 26 and the fan suction side plate 61 is made slightly larger so that the locking protrusion that caulks the fan blade 62 does not hit the outer surface of the suction side plate 61. .

Moreover, even if the locking protrusion rotates together with the fan 15 in this wide space, viscous resistance is small, and stirring loss can be kept small.

Further, the annular portion 26' of the fan casing is a flat portion with no slope. The fan casing made of sheet metal can be flattened with high dimensional accuracy, and the end surface of the differential user 31 that comes into contact with this surface is also flat,
They can be brought into close contact without the need for special rubbing. This prevents leakage between the differential users 31 (blades) and is effective in improving aerodynamic performance and workability.

Further, as shown in FIG. 7, a vibration isolating rubber 70 is fitted around the outer periphery of the fan casing 17. Since the inner diameter end 71 of the vibration isolating rubber 70 is located at the stepped part of the fan casing 17, even if there are variations in the assembly dimensions when this electric blower is assembled into a vacuum cleaner, the inner diameter end 71 of the vibration isolating rubber 70 is located at the step part of the fan casing 17. It will not be deformed. Since the vibration conductivity of the anti-vibration rubber 70 does not change significantly,
Vibration is well absorbed.

In addition, an inclined step portion 3 is provided at the connecting portion between the outer peripheral portion of the base plate portion 29 of the fixed guide plate 16 and the annular portion 30.
1' is formed, even if the outer periphery of the base plate 60 of the fan 15 is slightly lower than the annular part 30 due to variations in the assembly of the blower part, the air performance will not deteriorate significantly. This is because since the stepped portion 31' is inclined, the airflow flows smoothly and no turbulence occurs in the airflow.

[Effects of the Invention] As described above, according to the present invention, it is possible to attach blower sections of various sizes with various specifications to one electric motor, and it is also possible to make the upper end of the blade of a daily user into a complicated shape. without doing,
To provide an electric blower in which the fan casing, blades, and upper end can be easily brought into close contact with each other, which is easy to manufacture, and which can prevent airflow circulation between the blades and smoothly introduce airflow from the fan into the electric motor. can.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
The figure is a vertical cross-sectional view of the electric blower, the second figure is a plan view of the fixed guide plate, the third figure is a longitudinal cross-sectional view of the fixed guide plate, and the fourth figure is a longitudinal cross-sectional view of the electric blower.
The figure is a bottom view of the fixed guide plate, Figure 5 is a plan view of the fan, Figure 6 is a vertical cross-sectional view of the fan, Figure 7 is a vertical cross-sectional view of the fan casing and vibration isolating rubber, and Figure 8 is a partial view. FIG. 9 is a perspective view of the blower section broken away, and FIG. 9 is a perspective view showing the fan casing support and the electric motor. DESCRIPTION OF SYMBOLS 1...Electric motor, 5...Housing, 15...Fan, 16...Fixed guide plate, 17...Fan casing, 18...Fan casing support, 20...
...Outer annular cylinder part, 24...Vent hole, 25...Suction port, 26...Conical part, 26'...Annular flat part, 2
7... Annular tube part, 29... Base plate part, 30... Annular part, 31... Diff user, 32... Return guide vane, 60... Base board, 61... Suction side plate, 62... Blade.

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, a fan 15 provided above the fixed guide plate 16, and a fan 15 that covers the fan 15 and the fixed guide plate 16, and
Outer circumferential annular cylinder portion 2 of the fan casing support 18
0, the fan 15 is formed from a base plate 60, a suction side plate 61 having a suction port, and a blade 62 disposed between the two, and the fixed guide Board 16
, a disk-shaped substrate section 29, and this substrate section 29.
an annular portion 30 formed on the outer periphery of the substrate portion 29;
In order to raise the annular part 30 one step further, a differential user is formed of a sloped stepped part 31' formed at the boundary between the annular part 30 and the base plate part 29, and a plurality of blades formed on the upper surface of the annular part 30. 31
and a return guide vane 32 formed on the lower surface of the annular portion 30 and the base plate portion 29, and the airflow from the fan 15 passes through the differential user 31 and the return guide vane 32 to the ventilation hole. In the electric blower introduced into the electric motor 1 from 24, the fan casing 17 is connected to a conical part 26 having a suction port 25 in the center.
and a step portion 27' that slopes on the outer periphery of this conical portion 26.
and an annular cylindrical part 27 formed on the outer circumference of the annular flat part 26', and the upper end of the differential user is connected to the annular flat part 26 of the fan casing 17. ', and the suction port of the suction side plate 61 is opposed to the suction port of the fan casing 17, and the outer circumference of the fan 15 is opposed to the inner circumference of the differential user. , An electric blower characterized in that a base plate 60 of the fan 15 and an annular portion 30 of the fixed guide plate 16 are flush with each other.