JPH05296193A - Electric blower for cleaner - Google Patents

Abstract

PURPOSE:To provide an electric blower for a cleaner formed in such a way as to be fit for the automation of an assembling process in addition to being high in fan efficiency, mechanical strength and assembling work performance. CONSTITUTION:A fan 3 driven by a motor 1 is provided with a plate 5 fixed to the rotary shaft 2 of the motor 1, a plate 7 disposed on the anti-motor side of the plate 5 and provided with an air inlet port 6 at the center part protruding onto the anti-motor side so as to be formed into umbrella shape, and a blade plate 8 disposed between both plates 5, 7. An air exhaust port 20 is then formed between the peripheral edges of both plates 5, 7. In such constitution, an umbrella shape air guide member 9 with the center part thereof protruding onto the anti-motor side is supported on the anti-motor side face of the motor side plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower for a vacuum cleaner, and more particularly to an electric blower for a vacuum cleaner which has high fan efficiency, mechanical strength and assembling workability and is suitable for automating the assembling process. ..

[0002]

2. Description of the Related Art A conventional electric blower for a vacuum cleaner is, for example, as shown in a half sectional view of FIG. 20, a motor 101, a centrifugal fan 103 fixed to a rotating shaft 102 thereof, and a wind generated by the centrifugal fan 103. And a fan cover 104 for flowing the air to the side of the motor 101.

The centrifugal fan 103 has a plate-shaped motor side plate 105, an umbrella-shaped anti-motor side plate 107 having a central portion protruding toward the non-motor side, and an air intake port 106 opening at the central portion. Plate 105/10
A large number of vanes 108 spirally arranged between 7
And an exhaust port 109 formed between the peripheral edges of both plates 105 and 107.

This conventional electric blower for a vacuum cleaner has a large wind loss as described in, for example, Japanese Utility Model Publication No. 63-27113, which is disadvantageous in improving fan efficiency.

In another conventional electric blower for a vacuum cleaner, in order to improve the fan efficiency, for example, as shown in the sectional view of FIG. 21, a motor side plate 205 and a non-motor side plate 2 are provided.
The fan 20 and the fan 07 are formed into an umbrella shape.
3 is formed in a mixed flow fan shape.

Further, since the motor side plate 205 is fixed to the rotating shaft 202 of the motor, the washer 21 is attached to the rotating shaft 202.
The plate 205 and the washer 211 are fixed between the washer 210 and the nut 212 by fitting the plate 205 and the washer 211 from the tip of the rotating shaft 202 in order, and then tightening the nut 212 from the tip of the rotating shaft 202. I'm trying to pinch.

[0007]

However, in this conventional example, the motor side plate 205 is rotated at high speed.
The bending moment acts on the bent portion connecting the central flat plate portion and the umbrella-shaped portion by the centrifugal force that acts on the umbrella-shaped portion, so that it is easily deformed during high-speed rotation.

Further, since both plates 205 and 207 are formed in an umbrella shape, it is disadvantageous in improving the assembly dimensional accuracy, and a gap may be formed between the vane 108 and both plates 205 and 207. However, the assembly workability is poor, and many difficulties are involved in automating the assembly process.

Further, in these conventional examples, the washer 210 and the washer 211 are provided in order to prevent the surface deflection of the fan 203.
It is necessary to make the outer diameter of the fan larger than a certain value. Therefore, there is a large limitation in reducing the area of the portion where the air sucked from the air intake port 206 hits the air at a right angle, and there is great dissatisfaction in improving the fan efficiency. ing.

An object of the present invention is to provide an electric blower for a vacuum cleaner, which has high fan efficiency, mechanical strength, and assembling workability and is suitable for automating the assembling process.

[0011]

According to the present invention, there is provided a motor and a fan driven by the motor, the fan being fixed to a rotating shaft of the motor, and the plate being disposed on the side opposite to the motor. It has an umbrella-shaped plate whose central portion projects toward the non-motor side, and a vane plate that is arranged between both plates and fixed to both plates. In order to achieve the above object, in an electric blower for a vacuum cleaner, which is opened and has an exhaust port formed between the peripheral edges of both plates, in order to achieve the above-mentioned object, an umbrella whose central portion projects toward the anti-motor side on the side opposite the motor The air guide member is supported.

[0012]

In the present invention, since the air guide member is formed in the shape of an umbrella with the central portion projecting to the side opposite to the motor, the fan becomes a mixed flow fan shape, and the windage loss is reduced.

Further, since the motor side plate is flat, there are no weak points in terms of strength. Particularly in the present invention, when the air guide member is fixed to the motor side plate by adhesion or the like, the motor side plate is reinforced by the air guide member, so that the mechanical strength is further enhanced.

Moreover, since the motor side plate is flat, the air guide member, the vane plate and the anti-motor side plate can be assembled with high precision on the basis of this and the assembling workability can be improved. This is advantageous in automating the assembly process. In particular, in the present invention, when the motor side plate is circumferentially indexed and externally fitted to the motor side portion of the air guide member, the motor side plate and the air guide member are aligned with each other in the circumferential direction. Since the position can be easily aligned and the blade plate can be easily assembled, it is more advantageous in terms of improving the assembly workability and automating the assembly process.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric blower for a vacuum cleaner according to an embodiment of the present invention will be specifically described with reference to the drawings.

As shown in the half cross-sectional view of FIG. 1, this electric blower includes a motor 1, a fan 3 fixed to a rotation shaft 2 of the motor 1, and a fan cover 4 for flowing the wind generated by the fan 3 toward the motor 1. Is equipped with.

The fan 3 is formed into a flat plate-shaped motor side plate (hereinafter referred to as a stay plate) 5, a central portion protruding toward the side opposite to the motor, and a peripheral edge formed into an umbrella shape approaching the stay plate 5, and the central portion. A plate on the side opposite to the motor in which the air intake port 6 is formed (hereinafter referred to as a counter plate)
7, a plurality of blades 8 arranged spirally between both plates 5 and 7, and a baffle member 9 mounted on the side of the stay plate 5 opposite to the motor.

The stay plate 5 is formed of, for example, an aluminum plate, and has a sectional view of FIG. 2, a plan view of FIG.
As shown in the schematic view of (a), the rectangular long holes 11 formed on the installation line 10 of each blade 8 at appropriate intervals.
And a circular hole 12 formed at the center, and projections 13 formed at the end edges of each vane plate 8 at appropriate intervals are inserted into each rectangular elongated hole 11 to caulk the vane plate. 8 is fixed to the stay plate 5.

As shown in FIG. 2, the counter plate 7 is also provided with the same rectangular long holes 14 as the stay plate 5, and the projections 1 are formed at the end edges of the blade plates 8 at appropriate intervals.
The blade plate 8 is fixed to the counter plate 7 by pushing 5 into each square hole 14 and caulking.

The air guide member 9 is made of, for example, a synthetic resin, and as shown in the side views of FIGS. 1 to 3 and FIG. And a plurality of slits 16 through which each blade 8 is inserted.
And a central hole 17 through which the rotary shaft 202 is inserted. Each slit 16 is formed in a spiral shape as shown in the plan view of FIG. 5A, and is arranged at equal intervals in the circumferential direction.

The procedure for mounting the air guide member 9 is not particularly limited. For example, after fixing the vane plate 8 to the stay plate 5, each vane plate 8 is inserted into each slit 16 and adhered to the stay plate 5. Alternatively, the procedure of fixing the air guide member 9 to the stay plate 5 in advance and then fixing each vane plate 8 to the stay plate 5 can be adopted.

As shown in FIG. 2, the counter plate 7 and each vane plate 8 are appropriately spaced from each other at the end edges of each vane plate 8 in the same manner as the method of fixing each vane plate 8 to the stay plate 5. The protrusions 18 formed by placing them are inserted into the rectangular elongated holes 19 formed in the counter plate 7 and caulked to be fixed.

An air exhaust port 20 is opened over the entire circumference between the peripheral edges of the plates 5 and 7.

Further, as shown in FIGS. 1 and 2, the fan 3 is externally fitted to the rotary shaft 2 of the motor 1, and a nut 21 screwed to the tip of the rotary shaft 2 is screwed into the fan 3, so that The washer 22 fixed to the tip of the rotary shaft 2 is tightened and fixed to the rotary shaft 2.

In this electric blower for a vacuum cleaner, the fan 3 is rotated by rotating the motor 1, air is sucked into the fan 3 from the air intake 6, and the air discharged from the air exhaust 20 is covered by the fan cover. 4 is guided to the motor 1 side.

Since the central portion of the air guide member 9 is formed in an umbrella shape projecting to the side opposite to the motor, the fan 3 has a mixed flow fan shape, which reduces wind loss and improves fan efficiency.

Further, since the stay plate 5 is formed in a flat plate shape, there is no possibility of generating a moment to bend the plate by centrifugal force, so that the stay plate 5 is stronger than the conventional stay plate 205 formed in an umbrella shape. In addition to being advantageous, since the stay plate 5 is reinforced by the baffle member 9,
The mechanical strength is increased. Therefore, there is no possibility that the stay plate 5 is deformed during high-speed rotation.

Further, since the air guide member 9 is formed in an umbrella shape projecting to the side opposite to the motor at the central portion, the central portion of the air guide member 9 is formed thick, and the air guide member 9 is fitted onto the rotary shaft 2 outside. Can be accurately aligned with the rotating shaft 2, and by increasing the outer diameters of the air guide member 9 and the washer 22, the stay plate 5 can be accurately connected to the rotating shaft at a right angle. Is less likely to occur.

In addition, since the stay plate 5 has a flat plate shape, the vane plate 8, the air guide member 9 and the plate 7 on the side opposite to the motor can be assembled with high precision on the basis of this.
This is advantageous in automating the assembly process.

In the above embodiment, for example, as shown in FIG. 4A, the joint between the blade 8 and the air guide member 9 is angular, and turbulent flow e is generated at the corner. Alternatively, as shown in FIG. 4B, a turbulent flow e is generated in the vicinity of the negative pressure surface 8a of the vane plate 8, or a gap s is formed at the joint between the vane plate 8 and the baffle member 9, It was found that there is a problem that the wind w leaks from this gap and the fan efficiency decreases.

As a method for solving these problems, as shown in FIG. 4 (c), a fillet 9a is formed at the joint between the blade 8 and the baffle member 9, preferably its surface is R-shaped. It is effective to form the fillet portion 9a so that the surface of the blade plate 8 and the surface of the air guide member 9 are smoothly continuous.

In another embodiment of the present invention, as shown in, for example, the two views of FIG. 6 and the enlarged sectional view of FIG. 7, the wall 23 rising along the negative pressure surface 8a of the vane plate 8 is the air guide member 9.
Are continuously provided.

As shown in FIG. 6A, the thickness of the wall 23 becomes maximum at the central portion in the flow direction of each vane plate 8, and the wall 2
The radius of curvature R1 of the surface of No. 3 is larger than the radius of curvature R2 of the pressure surface 8b of the blade plate 8.

Since the other construction of this embodiment is the same as that of the above-mentioned one embodiment, the description thereof will be omitted to avoid duplication.

According to this embodiment, since the radius of curvature R1 of the surface of the wall 23 is made larger than the radius of curvature R2 of the positive pressure surface 8b of the vane plate 8, turbulent flow occurs on the negative pressure face 8a side of each vane plate 8. It is possible to reliably prevent the occurrence of the above, and to further improve the fan efficiency.

Further, the radius of curvature of the vane plate 8 is made smaller and assembled to the stay plate 5, and the air guide member 9 is pressed from the positive pressure surface 8b side of the vane plate 8 so that the vane plate 8 is pressed.
When the air guide member 9 is inserted into the slit 16 of the air guide member 9, the air guide member 9 can be easily assembled simply by pushing the air guide member 9 toward the stay plate 5 side even if there is some variation in the radius of curvature of the blade plate 8. Therefore, it is more advantageous in automating the assembly process.

Further, by integrally forming the air guide member 9 and the wall 23, it is possible to prevent air from leaking from the joint portion between the stay plate 5 and the blade plate 5, thereby further improving the fan efficiency. You can

In this case, especially when an R-shaped fillet is formed at the joint between the air guide member 9 and the wall 23, turbulent flow may occur at the joint between the air guide member 9 and the wall 23. Can be prevented and the fan efficiency can be further enhanced.

Further, the thickness of the vane plate 8 can be freely set,
Moreover, it is possible to prevent chattering noises and vibrations that occur when there is a slight gap in the connecting portion between the vane plate 8 and the stay plate 5 or the non-motor side plate 7, and it is even more advantageous in terms of strength.

Although the wall 23 receives a centrifugal force when the fan 3 rotates, it is reinforced by the blade plate 8,
Even in the thin portion, there is no problem in strength.

The other operations and effects of this embodiment are the same as those of the above-mentioned one embodiment, and therefore their explanations are omitted to avoid duplication.

In another embodiment of the present invention, for example, FIG.
2 and a magnified sectional view of FIG.
Walls 23 and 24 continuous with the baffle member 9 are provided along both surfaces of the.

The air guide member 9 and the walls 23 and 24 may be formed in advance by, for example, injection molding, and may be assembled to the stay plate 5 after or before the vane plate 8 is assembled to the stay plate 5. In the embodiment, after the vane plate 8 is assembled to the stay plate 5, it is molded and
A synthetic resin is molded to form a stay plate 5 and a vane plate 8.
It is formed as an integral part with.

Further, through holes 25 are formed at appropriate intervals in the vane plate 8 in order to increase the bonding strength between the air guide member 9 and both walls 23 and 24 and the vane plate 8, and the through holes 25 are formed at the time of molding. Is filled with synthetic resin that is integral with both walls 23 and 24.

In this embodiment, air leakage from between the vane plate 8 and the stay plate 5 can be reliably prevented, and
The assembling strength of these can be increased.

The other constructions, functions and effects of this embodiment are the same as those of the previous example, and therefore their explanations are omitted to avoid duplication.

In still another embodiment of the present invention, as shown in the half sectional view of FIG. 10, the motor 1 is moved from the center of the air guide member 9.
The boss portion 26 is extended to the side, and the stay plate 5 is externally fitted to the base end portion of the boss portion 26.

As shown in the bottom view of FIG. 11 and the sectional view of FIG. 12, there are provided positioning protrusions 27 that project outward in the radial direction. Correspondingly, a central hole 12 of the stay plate 5 is provided.
As shown in FIG. 15, a positioning groove 28 that is recessed radially outward is formed in the.

Here, the rectangular long hole 11 of the stee plate 5
The slit 16 of the baffle member 9 is formed at a position where the positioning protrusion 27 of the boss portion 26 and the positioning groove 28 of the stay plate 5 are aligned and the stay plate 5 is fitted to the boss portion 26. There is.

Although the air guide member 9 and the boss portion 26 have different diameters, the R-shaped fillet portion 2 is formed at the base end portion of the non-boss 26.
By providing 9, the connecting portion between the baffle member 9 and the boss portion 26 is strengthened.

Further, the tip end surface of the boss portion 26 is directly received by the inner race of the bearing 30 of the motor 1, so that the washer 22 can be omitted, the number of assembling steps can be reduced, and the cost can be reduced.

According to this embodiment, when the staying plate 5 is fitted into the boss portion 26 by aligning the positioning protrusion 27 of the boss portion 26 and the positioning groove 28 of the staying plate 5, the square elongated hole 11 of the stay plate 5 is formed. Slit 1 of air guide member 9
3, the stay plate 5 and the air guide member 9 can be aligned.
It is possible to further improve the assembling workability with the above, and it is possible to easily automate the assembling process of the stay plate 5 and the air guide member 9.

The other construction, operation and effect of this embodiment are the same as those of the above-mentioned one embodiment, and therefore their explanation is omitted to avoid duplication.

In each of the above embodiments, the air guide member 9 is formed with the slit 16 through which the blade plate 8 penetrates. For example, as shown in FIG. 14, the edge of the blade plate 8 on the motor 1 side is guided. The wind member 9 is shaped like an umbrella, and the projections 13 inserted into the elongated holes 11 of the stay plate 5 are continuously extended from this edge, while the wind guide member 9 has the edge of the blade plate 8 on the motor 1 side. It may be configured to form a spiral groove 31 to be fitted, and each elongated hole-like projection insertion hole 32 that penetrates the motor-side end surface of the air guide member 9 from this groove and inserts the projection 13. ..

In this case, by forming both side surfaces 33 of the groove 31 into tapered surfaces as shown in FIG. 15, it is possible to easily fit the edge of the blade 8 into the groove 31. Further, by forming a chamfer 34 having an R surface shape or a taper shape at the end portion of the projection insertion hole 32 as shown in FIG. 16,
The projection 13 can be easily inserted into the projection insertion hole 32, the assembly is facilitated, and the assembling workability can be improved.

If the dimensional accuracy and the positional accuracy of one of the groove 31 and the rectangular hole 11 are severely set, the dimensional accuracy and the positional accuracy of the other can be roughly set. Can be further increased.

In each of the above-described embodiments, the end surface of the air guide member 9 on the side opposite to the motor is formed to be a flat surface having a diameter larger than the outer diameter of the nut 21. 6
The part facing the airflow drawn from
The outer diameter can be reduced to further reduce the wind loss and further increase the fan efficiency.

In this case, further, for example, the cross-sectional view of FIG.
Alternatively, as shown in the cross-sectional view of FIG. 18, a counterbore 35 into which the nut 21 projects is formed in the center of the air guide member 9, and a part of the nut 21 is sunk into the air guide member 9 to further reduce wind loss. can do.

Further, as shown in FIG. 18, by extending the tip end portion 36 of the rotary shaft 2 of the motor 1 and forming it in a streamlined manner, the windage loss due to the tip end portion of the rotary shaft 2 can be reduced.

Further, as shown in FIG. 19, the surface of the air guide member 9 has a conical or streamlined surface which is continuous.
For example, it is possible to cover the nut 21 and the tip of the rotary shaft 2 with a cap 37 made of synthetic resin to reduce the windage loss due to the tip of the rotary shaft 2 and the nut 21.
In this case, the nut 21 can be fixed in the cap 21 by casting.

In the present invention, the umbrella-shaped air guide member whose central portion projects toward the non-motor side may be any umbrella shape in which at least the surface on the opposite motor side projects toward the non-motor side. Therefore, it is not necessary to be solid as shown in each of the above-described embodiments, and the hollow body or the plate material can be used.

[0062]

As described above, according to the present invention, the fan on the plate on the motor side is attached with the umbrella-shaped air guide member having the central portion projecting to the side opposite to the motor, and the fan is formed into a mixed flow fan. Therefore, the windage loss is reduced and the fan efficiency can be improved.

Further, since the motor side plate has a flat plate shape, there are no points of weakness in strength at high speed rotation, so deformation at high speed rotation can be prevented.

Particularly in the present invention, when the air guide member is fixed to the motor side plate by adhesion or the like, since the motor side plate is reinforced by the air guide member, the mechanical strength is further enhanced and the high speed rotation is more surely performed. It is possible to prevent deformation of the fan at the time.

Moreover, since the motor side plate is flat, the air guide member, the vane plate and the counter motor side plate can be assembled with high precision based on this, and the workability of the assembling work can be improved. Both are advantageous in automating the assembly process.

In particular, in the present invention, when the motor side plate is circumferentially indexed to the motor side portion of the air guide member so as to be externally fitted, the motor side plate and the air guide member are aligned. In addition, the positioning in the circumferential direction can be easily performed, and the vane plate can be easily assembled, which is further advantageous in improving the assembling workability and automating the assembling process.

[Brief description of drawings]

FIG. 1 is a half sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of an embodiment of the present invention.

FIG. 3 is a plan view of a stay plate according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a main part of the present invention, in which (a) is a schematic diagram of the above-described embodiment, and (b) and (c) are schematic diagrams of modified examples thereof.

FIG. 5 is a plan view and a side view of a wind guide member according to an embodiment of the present invention.

FIG. 6 is a plan view and a side view of a baffle member according to another embodiment of the present invention.

FIG. 7 is a schematic view showing a cross section of a main part of another embodiment of the present invention.

FIG. 8 is a plan view and a side view of a baffle member according to another embodiment of the present invention.

FIG. 9 is a schematic view showing a cross section of a main part of still another embodiment of the present invention.

FIG. 10 is a half cross-sectional view showing a cross section of the main part of still another embodiment of the present invention.

FIG. 11 is a bottom view of an air guide member according to still another embodiment of the present invention.

12 is a cross-sectional view taken along the line AA of FIG.

FIG. 13 is a plan view of a stay plate according to still another embodiment of the present invention.

FIG. 14 is a cross-sectional view of a modified example of the fan of the present invention.

15 is a cross-sectional view taken along the line BB of FIG.

16 is an enlarged view of a portion indicated by an arrow C in FIG.

FIG. 17 is a sectional view of another modification of the present invention.

FIG. 18 is a cross-sectional view of another modification of the present invention.

FIG. 19 is a sectional view of still another modification of the present invention.

FIG. 20 is a half sectional view of a conventional example.

FIG. 21 is a cross-sectional view of a main part of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 motor 2 rotating shaft 3 fan 5 stay plate 6 air intake 7 counter plate 8 vane plate 9 air guide member

Claims (1)

[Claims] 1. A plate comprising a motor and a fan driven by the motor, the plate being fixed to the rotation shaft of the motor, the plate being disposed on the side opposite to the motor, and the central portion protruding toward the side opposite to the motor. An umbrella-shaped plate,
A vacuum cleaner having a vane plate disposed between both plates and fixed to both plates, an air intake opening being formed in the center of the plate on the side opposite to the motor, and an air exhaust opening being formed between the peripheral edges of both plates. An electric blower for a vacuum cleaner, characterized in that an umbrella-shaped air guide member having a central portion protruding toward the non-motor side is supported on the side of the motor side plate opposite the motor.