JPH11324982A - Electric blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the lowering of the blowing performance due to the leak of air flow to an adjacent passage through a clearance and the unevenness of pressure rise by eliminating the clearance generated in a connection part of a resin inducer to a plate blade. SOLUTION: In this blower, a resin inducer 25 is provided with a connection part 27, and this connection part 27 is formed with a groove part 27a, in which an end of a plate blade 24 is to be fitted. With this structure, a clearance between the resin inducer 25 and the plate blade 24 is eliminated so as to restrict the generation of loss at this connection part. High suction performance can be thereby obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower used for a vacuum cleaner for sucking dust.

[0002]

2. Description of the Related Art In recent years, electric vacuum cleaners have tended to increase the output of electric blowers in order to effectively perform carpet cleaning and the like.

A conventional electric blower will be described below with reference to FIG.
-It will be described based on FIG. 13 is a partially cutaway side view of an electric blower including an impeller, a fan case, and a motor. FIG. 14A is a partially cutaway perspective view of the impeller, and FIGS. 14B and 14C are blade-in. FIG. 4 is an enlarged view of a ducer joint.

In FIGS. 13 and 14, reference numeral 1 denotes an impeller main body. Reference numeral 2 denotes a sheet metal rear shroud, and a sheet metal front shroud 3 is disposed so as to face the shroud 2, and a gap is provided between the shrouds 2 and 3. Reference numeral 4 denotes a plurality of sheet metal blades sandwiched between the pair of shrouds 2 and 3. Reference numeral 5 denotes an intake port 3a (also serving as an intake port of the impeller body 1) provided at the center of the front shroud 3. This is an inducer for rectifying the airflow from the intake port 3a, and it is necessary to enhance the rectifying action in terms of increasing the output of the electric blower. Therefore, the shape of the inducer 5 is a three-dimensional curved surface.

The inducer 5 comprises a substantially conical hub 6 and a blade 5a formed thereon. The upper and lower surfaces of each sheet metal blade 4 are each provided with a projection 4a,
4b, and the projections 4a and 4b are
Into the hole provided in the rear shroud 2 and
The ends of a and 4b are crushed (caulking) so that the sheet metal blade 4 is sandwiched between the shrouds 2.3. As described above, the shrouds 2 and 3 and the blades 4 which are the main parts of the impeller body 1 are made of sheet metal so that their strength is increased, and even if the impeller body is rotated at high speed to increase the output, there is no problem in strength. I have to.

Further, it is difficult for the sheet metal blade 4 and the blade part 5a of the separate resin inducer 5 to be properly aligned during assembly, so that the sheet metal blade 4 and the resin inducer 5 are difficult to match. A gap 7 exists between the outermost peripheral portions of the blade portions 5a. Further, the sheet thickness of the blade 4a of the sheet metal blade 4 and the blade portion 5a of the resin inducer 5 are different from each other, and a displacement occurs at the joining position of the two.

Reference numeral 8 denotes a motor for driving the impeller body 1;
Reference numeral 9 denotes an air guide, and the air that has flowed in the outer peripheral direction of the impeller main body 1 through the air guide 9 flows into the motor 8. Reference numeral 10 denotes a fan case which includes the impeller main body 1 and the air guide 9 and is hermetically attached to the outer periphery of the motor 8 and has a suction hole at the center thereof.

The operation in the above configuration will be described. The impeller main body 1 rotates at a high speed and sucks the air flow from the intake port 3a of the impeller main body 1. It passes between the blades 4 and is discharged from the outer periphery of the impeller body 1. Further, the air flow passes through the air guide 9 and the motor 5
It is discharged inside.

[0009]

In the electric blower described above,
Since the gap 7 exists between the resin-made inducer 5 and the sheet-metal blade 4, when air from the resin-made inducer 5 flows into the sheet-metal blade 4, air leaks into an adjacent passage, and the pressure increases. It is difficult to ascend and becomes uneven, and the flow is disturbed and loss occurs. In addition, resin inducer 5
Since the outer peripheral edge of the blade portion 5a tends to have an uneven thickness, and has a thickness different from that of the sheet metal blade 4,
The air flow is further disturbed and losses occur. In addition, there is a problem that the outer peripheral end of the blade portion 5a of the resin-made inducer 5 is deformed, displaced, and broken due to centrifugal force.

[0010] It is an object of the present invention to eliminate a gap between a resin-made inducer and a sheet-metal blade, to suppress loss caused by the gap, and to prevent damage to the inducer portion.

[0011]

In order to achieve the above object, according to the present invention, a connecting portion for connecting an intake port side end of a sheet metal blade is formed in a part of an inducer. The gap between the sheet metal blades can be filled, and the air flow smoothly flows from the resin inducer to the sheet metal blade, thereby suppressing loss. Further, since the inducer portion is connected to the sheet metal blade, the strength of the inducer portion is increased, and breakage thereof can be prevented.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION
Equipped with an electric motor and an impeller rotated by the electric motor,
The impeller, a front shroud having an intake port, a rear shroud arranged at a distance from the front shroud, a plurality of sheet metal blades sandwiched by these shrouds, and provided on the intake port side of the impeller. And a resin-made inducer for rectifying the intake air flow, and a connection portion for connecting an intake port side end of the sheet metal blade is formed in a part of the inducer.

With this configuration, the gap between the resin-made inducer and the sheet-metal blade can be filled, and the air flow smoothly flows from the resin-made inducer to the sheet-metal blade.
Reduce the occurrence of losses. Further, since the inducer portion is connected to the sheet metal blade, the strength of the inducer portion is increased, and breakage thereof can be prevented.

[0014] The second aspect of the present invention is the first aspect.
Since the connection portion described above is a fitting portion for fitting the end portion of the sheet metal blade on the intake port side, the assembly can be performed by a simple assembly in which the end portion of the sheet metal blade is fitted.

The third aspect of the present invention is the first aspect of the present invention.
Or, the intake port side end of the sheet metal blade according to 2 is an inclined surface, the connecting portion has an inclined surface that comes into contact with the inclined surface of the sheet metal blade, and the inclined surface of the connecting portion and the inclined surface of the sheet metal blade. Are brought into contact with each other to make the outer shape of these connecting portions smooth.

In this configuration, the sheet metal blade and the resin inducer can be connected by bringing the inclined surfaces into contact with each other,
In addition, since the connection is made between inclined surfaces, the plate thickness of the sheet metal blade and the resin inducer can be the same,
The outer shape of the connection part becomes smooth. Therefore, the air flowing through these connection portions is less likely to be disturbed,
The blowing efficiency can be increased.

The fourth aspect of the present invention is the first aspect of the present invention.
Alternatively, the connecting portion described in 2 is in contact with one side of the end of the sheet metal blade on the intake port side, and the contacting direction is the direction in which the end portion of the sheet metal blade is pressed by impeller rotation.

In this configuration, when the impeller rotates, one side of the end of the sheet metal blade on the suction port side comes into pressure contact with the connection portion, so that the airtightness between the sheet metal blade and the inducer is enhanced, and air leakage can be prevented. .

The invention according to claim 5 of the present invention is directed to claim 4
A part of the end of the sheet metal blade described above on the intake port side is protruded in the direction of pressing, and this protruding portion is cut into the connection part, so that the sheet metal blade can be more firmly attached to the connection part.

The invention according to claim 6 of the present invention is the invention according to claim 1.
Or the connecting portion described in 2 above sandwiches both sides of the end of the sheet metal blade on the inlet side, and in this configuration, both sides of the sheet metal blade can be more firmly connected to the connecting portion; Air leakage at the connection portion can be suppressed as compared with the case where only the pressure is applied.

The seventh aspect of the present invention provides the first aspect.
Alternatively, the sheet metal blade according to 2 is formed with an uneven portion in the height direction at an end portion on the intake port side, and an uneven portion into which the uneven portion is fitted at a connecting portion, and each uneven portion is fitted. It is possible to easily connect the metal blade and the resin inducer simply.

[0022] The invention according to claim 8 of the present invention relates to claim 1.
Alternatively, a bar-shaped portion whose axial direction is the height direction is provided at the end of the sheet-metal blade according to 2 above, and a hole for inserting at least one end of the bar-shaped portion is provided in the shroud. By inserting the rod-shaped part into the hole of the shroud, the position of the end of the sheet metal blade can be securely fixed, and the connection part of the resin inducer to which that end is connected must be firmly attached to the shroud. Can be.

The ninth aspect of the present invention is the first aspect.
Alternatively, the outer shape of the connecting portion described in 2 is a shape that smoothes the flow of the airflow, and turbulence of air generated when flowing through this connecting portion can be suppressed, and the blowing efficiency can be increased.

According to a tenth aspect of the present invention, a fine uneven portion is provided on the surface of the connecting portion according to the first or second aspect, and the separation and leakage of air flowing through the connecting portion are reduced. Can be.

According to an eleventh aspect of the present invention, the connecting portion according to the first or second aspect is formed integrally with the end of the sheet metal blade on the side of the intake port. The alignment work is simplified, and the displacement between the sheet metal blade and the connecting portion caused by the rotation of the impeller can be prevented.

According to a twelfth aspect of the present invention, there is provided the sheet metal blade according to the eleventh aspect, wherein a sheet metal hole is formed on a side surface of an end portion on an intake port side. Can be connected to the connection part.

According to a thirteenth aspect of the present invention, there is provided an electric motor, an impeller rotated by the electric motor, the impeller being a front shroud having an intake port, and a rear surface being spaced from the front shroud. Shroud,
A plurality of sheet metal blades sandwiched by these shrouds, and a resin-made inducer provided on the intake port side of the impeller to rectify the intake air flow, and an intake port side end of the sheet metal blade and A filling portion is provided in a gap between the resin-made inducer.

In this configuration, since the filling portion is provided in the gap between the inlet end of the sheet metal blade and the resin-made inducer, it is possible to prevent air from leaking from the gap.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows a first embodiment of the present invention.
This will be described below. Since the mounting configuration of the impeller body and the motor is the same as the conventional configuration, detailed description thereof is omitted. Since the feature of the present embodiment resides in the impeller body, it will be described in detail below. FIG. 1A is a partially cutaway perspective view of an impeller, and FIGS. 1B and 1C are enlarged views of a connection portion between a blade and an inducer.

In FIG. 1, reference numeral 21 denotes an impeller body, which is sandwiched between a rear shroud 22 made of sheet metal, a front shroud 23 made of sheet metal arranged at an interval from the rear shroud 22, and a pair of shrouds 22, 23. A plurality of sheet metal blades 24 and a resin inducer 25 provided corresponding to an air inlet 23 a provided at the center of the front shroud 23. The sheet metal blade 24 is attached to each of the shrouds 22 and 23 by caulking in the same manner as the conventional arrangement. The resin-made inducer 25 comprises a substantially conical hub 25b and a blade 25a formed on the hub 25b.
In order to rectify the air flowing from 3a to the sheet metal blade 24 side, the shape of the blade portion 25a is a shape having a three-dimensional curved surface.
It is preferable that the resin be formed by resin molding.

The resin-made inducer 25 is provided with a connecting portion 27, and a groove 27a is formed for fitting an end of the sheet-metal blade 24 on the intake port side. This groove 27
The both sides of the intake port side end of the sheet metal blade 24 are fitted into a, so that the contact area between the resin inducer 25 and the sheet metal blade 24 is increased.

The operation in the above configuration will be described. The impeller main body 21 rotates at a high speed and the impeller main body 2 rotates.
The airflow is sucked from the first air inlet 23a. This air flow passes through an internal passage surrounded by the front shroud 23 and the resin inducer 25, and subsequently, the front and rear shrouds 23.2
2 and an internal passage surrounded by a sheet metal blade 24,
It is discharged from the outer periphery of the impeller body 21. At this time, since the air flow is connected without any gap between the resin-made inducer 25 and the sheet-metal blade 24, it is difficult for the air flow to leak to the adjacent passage, and the pressure rise and the internal flow are performed smoothly.

As described above, according to the impeller for an electric blower of the present embodiment, the connecting portion 27 is provided on the resin-made inducer 25, and the end of the adjacent sheet-metal blade 25 is fitted. And the pressure drop and the turbulence of the air flow in the connecting portion between the resin-made inducer 25 and the sheet metal blade 24 and in the passage after this connecting portion are reduced, so that high suction performance can be obtained.

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention.
This will be described below. Since the basic configuration of the impeller body is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade and a resin The connection with the inducer will be described in detail below.

FIGS. 2 (a) and 2 (b) are enlarged views of a connection portion between the blade and the inducer in the impeller.

In FIG. 2, the intake port side end of the sheet metal blade 24 is an inclined surface 37, and the connecting portion 38 of the resin-made inducer 25 is an inclined surface that comes into contact with the inclined surface 37 of the sheet metal blade 24. The inclined surface of the connecting portion 38 and the inclined surface 37 of the sheet metal blade 24 are in contact with each other to form a connection portion where no gap is generated. Further, since the plate thickness of the end portion of the sheet metal blade 24 is made equal to the plate thickness of the connection portion 38 of the resin inducer 25, the outer shape of the connection portion has a smooth flat shape as shown in the drawing, Turbulence does not occur in the air flowing through this portion, and the turbulence of the air flow can be further improved. Further, since the inclined surfaces come into surface contact with each other, airtightness can be ensured, it is hard to leak to the adjacent passage, and there is little collision or separation of the air flow, and the pressure rise and the internal flow are performed smoothly.

(Embodiment 3) FIG. 3 shows a third embodiment of the present invention.
This will be described below. Since the basic configuration of the impeller body is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade and a resin The connection with the inducer will be described in detail below.

FIGS. 3A and 3B are enlarged views of the blade-inducer connection portion of the impeller.

In FIG. 3, the connecting portion 47 of the resin-made inducer 25 is connected to the inlet-side end 24 of the sheet metal blade 24.
The stepped portion 47a is formed so as to abut one side of the blade a, and the direction in which the stepped portion 47a is abutted is the direction in which the end 24a of the sheet metal blade 24 is pressed by the rotation of the impeller. Further, since the end of the sheet metal blade 24 is fitted into the step portion 47 a of the connecting portion 47, the other surface 24 b of the end 24 a of the sheet metal blade and the outer peripheral surface of the connecting portion 47 are flush. Further, the connecting portion 4
The inner peripheral surface 47b side of 7 is formed in a plane circular arc shape and is thick so as to obtain sufficient strength to receive the force of the end 24a of the sheet metal blade 24.

In this configuration, when the impeller 21 rotates, one surface of the inlet-side end 24a of the sheet metal blade 24 comes into pressure contact with the connecting portion 47, so that the airtightness between the sheet metal blade 24 and the inducer 25 is increased, and air Can be prevented from leaking. In particular, when the impeller 21 starts rotating, even if the sheet metal blade 24 and the connecting portion 47 are not in strict contact, the rotational force is transmitted in the order of the connecting portion 47 and the sheet metal blade 44, so that the pressure contact between the two is completed simultaneously with the rotation. I do. Also,
Since the outer periphery of the connecting portion 47 is formed in an arc shape, it is possible to prevent the air passing through this portion from being greatly disturbed and lowering the efficiency, and the inner peripheral surface side of the connecting portion 47 is formed flush. There is almost no turbulence in the airflow flowing on this side.

Even if the assembly is performed without precise positioning, the connecting portion 47 is slightly rotated / deformed, and the positioning between the sheet metal blade 24 and the resin inducer 25 is automatically performed during rotation. Therefore, assembly of parts becomes easy.

(Embodiment 4) FIG. 4 shows a fourth embodiment of the present invention.
This will be described below. Since the basic configuration of the impeller body is the same as that of the third embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade which is a feature of this embodiment will be described. Hereinafter, a connection portion between the resin and the resin inducer will be described in detail.

FIGS. 4A and 4B are enlarged views of a connection portion between the blade and the inducer in the impeller.

In FIG. 4, a part of the inlet side end 24a of the sheet metal blade 24 of the third embodiment is protruded in the direction of pressing, and the protruding portion 24c is cut into the connecting portion 47. is there. The protruding portion 24c has a tapered shape to make it easy to bite into the connecting portion 47.

As described above, according to the impeller for an electric blower of this embodiment, in addition to the effects of the third embodiment, the protruding portion 24c is provided on the sheet metal blade 24,
At the time of rotation, the connecting portion 47 is always kept in pressure contact with the sheet metal blade 24, and furthermore, the protruding portion 24c bites into the connecting portion 47, and the degree of adhesion is improved over the details to reduce the leakage of the air flow. The pressure drop and the turbulence of the air flow in the connection part with the blade 24 and the passage after this connection part are reduced, and high suction performance can be obtained.

(Embodiment 5) A fifth embodiment of the present invention is shown in FIG.
This will be described below. Since the basic structure of the impeller body is the same as that of the first embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade which is a feature of this embodiment will be described. Hereinafter, a connection portion between the resin and the resin inducer will be described in detail.

FIGS. 5A and 5B are enlarged views of the connection between the blade and the inducer in the impeller.

In FIG. 5, the suction port side end 24a of the sheet metal blade 24 of the first embodiment is press-fitted into the tapered groove 27a of the connecting portion 27. That is, before the suction port side end 24a of the sheet metal blade 24 is inserted, as shown in FIG.
is tapered. When the suction port side end 24a of the sheet metal blade 24 is press-fitted into the groove 27a, it is press-fitted and held in the groove 27a as shown in FIG. Also,
Since the end portion 24a of the sheet metal blade 24 is sandwiched on both sides by the connecting portion 27, even if the impeller 21 rotates, the connecting portion can surely receive the force of the end portion 24a of the sheet metal blade 24, In particular, when the rotation of the impeller 21 is rapidly reduced, the end portion 24a of the sheet metal blade 24 tends to move in a direction opposite to the normal rotation, but this end portion 24a is sandwiched by the connecting portions 27 from both sides. As a result, such a force can be reliably received, and there is no displacement between the resin-made inducer 25 and the sheet-metal blade 24.

(Embodiment 6) FIG. 6 shows a sixth embodiment of the present invention.
This will be described below. Since the basic configuration of the impeller body is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade and a resin The connection with the inducer will be described in detail below.

FIGS. 6A and 6B are enlarged views of the connection between the blade and the inducer in the impeller.

In FIG. 6, an uneven portion 77 is formed in the height direction at the end of the sheet metal blade 24 on the intake port side, and an uneven portion to be fitted into the uneven portion 77 is formed at the connecting portion 78. Then, the sheet metal blade 24 and the resin inducer 25 can be easily connected simply by fitting the respective concave and convex portions. In addition, since the plate thickness of the connection portion between the sheet metal blade 24 and the resin inducer 25 is equal,
Both sides of this connection portion are flush with each other, and it is possible to suppress the occurrence of turbulence in the air flow. Further, since the connection can be made flush with the connecting portion 78 without reducing the thickness of the sheet metal blade 24, the strength of the sheet metal blade 24 can be reduced despite the smooth connection from the resin inducer 25. Can be enhanced.

(Embodiment 7) FIG. 7 shows a seventh embodiment of the present invention.
This will be described below. Since the basic configuration of the impeller body is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade and a resin The connection with the inducer will be described in detail below.

FIGS. 7A and 7B are enlarged views of a connection portion between the blade and the inducer in the impeller.

In FIG. 7, a rod-shaped portion 88 whose axial direction is the height direction is provided at the end of the sheet metal blade 24 on the intake port side, and a hole 89 into which one end of the rod-shaped portion 88 is inserted is formed in the rear shroud 22. By inserting the rod-shaped portion 88 of the sheet metal blade 24 into the hole 89 of the rear shroud 22, the position of the end of the sheet metal blade 24 can be reliably fixed and the end is connected. The connecting portion 87 of the resin-made inducer 25 can also be firmly attached to the rear shroud 22, and positional displacement and generation of a gap due to positional displacement can be reduced.

Although the rod-shaped portion 88 is inserted into the hole 89 of the rear shroud 22 in this embodiment, it may be inserted into the hole of the front shroud 23.
Alternatively, holes may be provided in both of the shrouds 22 and 23, and both ends of the bar-shaped portion may be inserted into the holes of the shrouds 22 and 23.

(Embodiment 8) FIG. 8 shows an eighth embodiment of the present invention.
This will be described below. Since the basic configuration of the impeller body is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade and a resin The connection with the inducer will be described in detail below.

FIGS. 8A and 8B are enlarged views of the connection between the blade and the inducer in the impeller.

In FIG. 8, the suction port side end of the sheet metal blade 24 is fitted into the connecting portion 97 of the resin inducer. In addition, the outer shape of the connection portion 97 allows air flowing outside the connection portion 97 to flow smoothly. That is, the shape of the connection portion 97 is formed of a smooth curved surface, and is continuously connected to the sheet metal blade 94.

As described above, since the outer shape of the connecting portion 97 is formed of a smooth curved surface and is connected to the sheet metal blade 94, the air at the connecting portion between the resin inducer 25 and the sheet metal blade 24 is formed. Current collisions and turbulence are reduced,
High suction performance can be obtained.

(Embodiment 9) A ninth embodiment of the present invention will be described with reference to FIG.
This will be described below. Since the basic configuration of the impeller body is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade and a resin The connection with the inducer will be described in detail below.

FIGS. 9A and 9B are enlarged views of the connection between the blade and the inducer in the impeller.

In FIG. 9, the end of the sheet metal blade 24 on the side of the intake port is fitted into the connecting portion 107 of the resin inducer 25. In addition, the slits 1 with a small interval are formed on the surface of the connecting portion 107 from the front shroud 103, which is perpendicular to the streamline of the air flow, toward the rear shroud 102.
08 are provided.

The operation of the above configuration will be described. When air flows from the resin-made inducer 25 to the sheet-metal blade 24, the air passes through the slit 108 on the surface of the connection portion 107 at the connection between them. The separation due to the development of the boundary layer is suppressed. Furthermore, it is hard to leak to the adjacent passage, and the pressure rise and the internal flow are performed smoothly.

(Embodiment 10) A tenth embodiment of the present invention will be described with reference to FIG. Since the basic configuration of the impeller body is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade and a resin The connection with the inducer will be described in detail below.

FIGS. 10A and 10B are enlarged views of the connection between the blade and the inducer in the impeller.

In FIG. 10, the sheet metal blade 24 is connected to a connecting portion 117 provided at the outer edge of the resinous inducer 24. The connecting portion 117 is connected to the resinous inducer 25 by integral molding. Sheet metal blade 2
4 are integrally formed so as not to form a gap.

As described above, according to the impeller for an electric blower of the present embodiment, the end of the sheet metal blade 24 and the connection portion 117 of the resin inducer 25 are integrally formed, so that the resin at the time of assembly is formed. There is no need to position the inducer 25 and the sheet metal blade 24, and no displacement occurs during rotation.

Embodiment 11 An eleventh embodiment of the present invention will be described with reference to FIG. Since the basic configuration of the impeller body is the same as that of the tenth embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade which is a feature of this embodiment will be described. Hereinafter, a connection portion between the resin and the resin inducer will be described in detail.

FIGS. 11A and 11B are enlarged views of a connection portion between the blade and the inducer in the impeller.

In FIG. 11, a plurality of sheet metal holes 127 are formed on the side surface of the end of the sheet metal blade 24 of the tenth embodiment on the side of the intake port, and these sheet metal holes 127 are connected so as to be embedded. The part 117 is integrally formed. As a result, the inside of the sheet metal hole 127 is filled with the resin, and no gap is formed between the resin-made inducer 25 and the sheet metal blade 24, and the connection can be made firmly. Therefore,
Even if stress such as torsion or bending is concentrated on the connection portion 117, deformation or destruction is unlikely to occur.

(Embodiment 12) A twelfth embodiment of the present invention will be described with reference to FIG. Since the basic configuration of the impeller body is the same as that of the above-described embodiment, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and a sheet metal blade and a resin The connection with the inducer will be described in detail below.

FIGS. 12A and 12B are enlarged views of a connection portion between the blade and the inducer in the impeller.

In FIG. 12, a filling portion 140 is provided in a gap between the end of the sheet metal blade 24 on the side of the intake port and the resin inducer 25. Reference numerals 137 and 138 denote inner peripheral ends of the sheet metal blade 24 and the resin inducer 25, respectively.
It is a notch provided on the outer edge. These notches 1
37, 138 and the filling portion 1
40 is formed, and the inner peripheral edge of the sheet metal blade 24 and the outer edge of the resin-made inducer 25 are connected through the filling portion 140 without a gap.

As described above, according to the impeller for an electric blower of the present embodiment, the filler 139 is filled in the vicinity of the notches 137 and 138 to fill the gap between the resin inducer 135 and the sheet metal blade 134. Thereby, the leakage of the air flow is reduced, and the pressure drop and the turbulence of the air flow in the connecting portion between the resin inducer 135 and the sheet metal blade 134 and in the passage after the connecting portion are reduced, thereby obtaining high suction performance. be able to. Here, the filler 139 is smoothly filled by the cutout portions 137 and 138, and the resin inducer 25 and the sheet metal blade 24 are smoothly joined. Further, the filling section 140 is provided with the front and rear shrouds 2.
Both 3 and 22 are in close contact. As a result, it is possible to reduce the occurrence of collision or separation of the air flow in the filling section 140, and to realize a higher suction performance with a shape that can be easily expressed.

[0076]

According to the first aspect of the present invention, a resin inducer and a sheet metal blade are provided by providing a connection part to a resin inducer and connecting an end of a sheet metal blade to the connection part. Air gap is reduced, the leakage of air flow is reduced, the pressure drop and the turbulence of the air flow are reduced in the connection part between the resin inducer and the sheet metal blade and in the passage after this connection part. High suction performance can be obtained.

According to the second aspect of the present invention, since the connecting portion is a fitting portion for fitting the end portion on the intake port side of the sheet metal blade, a simple assembly in which the end portion of the sheet metal blade is fitted. In addition, as in the first aspect of the present invention, high suction performance by filling the gap can be ensured.

In the invention according to claim 3 of the present invention, since the end of the sheet metal blade on the side of the intake port is formed as an inclined surface, and the connecting portion has an inclined surface which comes into contact with the inclined surface of the sheet metal blade. By contacting the inclined surfaces, the sheet metal blade and the resin inducer can be connected, and since the inclined surfaces are connected, the plate thickness of the sheet metal blade and the resin inducer can be the same. As a result, the outer shape of the connection portion becomes smooth. Therefore, the air flowing through these connection portions is less likely to be disturbed, and high suction performance can be obtained.

According to a fourth aspect of the present invention, the connecting portion is in contact with one side of the inlet end of the sheet metal blade,
And since the direction of the contact is set to the direction in which the end of the sheet metal blade is pressed by the impeller rotation, when the impeller rotates, the airtightness between the sheet metal blade and the inducer is increased, and air can be prevented from leaking. Suction performance can be obtained.

According to a fifth aspect of the present invention, a part of the end of the sheet metal blade according to the fourth aspect on the intake port side is protruded in a direction of pressing, and this protruding portion is cut into the connecting portion. Therefore, the sheet metal blade can be more firmly attached to the connecting portion, and the airtightness between the connecting portion and the end portion of the sheet metal blade can be ensured even when the impeller is rapidly decelerated or rapidly rotated.

According to the sixth aspect of the present invention, since the connecting portion sandwiches both sides of the end of the sheet metal blade on the intake port side, both ends of the sheet metal blade can be connected more firmly by the connecting portion. Further, air leakage at the connection portion can be suppressed as compared with the case where only one surface of the sheet metal blade is pressed. Further, even in the case of rapid deceleration or rapid acceleration rotation of the impeller, the airtightness between the connection portion and the end of the sheet metal blade can be ensured.

According to a seventh aspect of the present invention, the sheet metal blade has an uneven portion in the height direction at an inlet end of the sheet metal blade and an uneven portion to be fitted into the uneven portion at a connection portion. Thus, the sheet metal blade and the resin inducer can be easily connected only by fitting the respective concave and convex portions.

The invention according to claim 8 of the present invention is characterized in that a bar-shaped portion whose axial direction is the height direction is provided at the end of the sheet metal blade at the intake port side, and at least one end of the bar-shaped portion is inserted. The end of the sheet metal blade can be securely fixed by inserting the rod-shaped part of the sheet metal blade into the hole of the shroud, and the resin inducer to which the end is connected is provided. Can be firmly attached to the shroud. Therefore, even when the impeller is rapidly decelerated or rapidly accelerated, airtightness between the connection portion and the end of the sheet metal blade can be ensured.

According to a ninth aspect of the present invention, the outer shape of the connecting portion is a shape for smoothing the flow of the air flow, and the turbulence of air generated when flowing through the connecting portion is suppressed. And high suction performance can be obtained.

According to a tenth aspect of the present invention, fine irregularities are provided on the surface of the connection portion, and separation and leakage of air flowing through the connection portion can be reduced.

According to the eleventh aspect of the present invention, the connecting portion is formed integrally with the end of the sheet metal blade on the side of the intake port, thereby simplifying the work of aligning the sheet metal blade with the connecting portion. In addition, it is possible to prevent the displacement between the sheet metal blade and the connection portion caused by the rotation of the impeller.

According to a twelfth aspect of the present invention, there is provided the sheet metal blade according to the eleventh aspect, wherein a sheet metal hole is formed on a side surface of an end portion on an intake port side. A blade can be connected to the connection.

According to the thirteenth aspect of the present invention, the filling portion is provided in the gap between the inlet end of the sheet metal blade and the resin inducer, so that the end of the sheet metal blade and the resin inducer are provided. Air can be prevented from leaking from the gap with
High suction performance can be obtained.

[Brief description of the drawings]

FIG. 1 (a) is a partially cutaway perspective view of an impeller for an electric blower according to a first embodiment of the present invention, (b) an enlarged plan view of a connection portion between a blade and an inducer of the impeller, and (c) an impeller. Enlarged sectional view of the connection part between the blade and the inducer

FIG. 2 (a) is an enlarged plan view of a connection portion between a blade and an inducer in an impeller of an electric blower according to a second embodiment of the present invention; and (b) an enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure

FIG. 3 (a) is an enlarged plan view of a connection portion between a blade and an inducer in an impeller of an electric blower according to a third embodiment of the present invention; and (b) an enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure

FIG. 4 (a) is an enlarged plan view of a connection portion between a blade and an inducer of an impeller of an electric blower according to a fourth embodiment of the present invention. (B) An enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure

FIG. 5 (a) is an enlarged plan view of a connection portion between a blade and an inducer in an impeller of an electric blower according to a fifth embodiment of the present invention. (B) An enlarged cross section of a connection portion between the blade and the inducer of the impeller. Fig. (C) An enlarged plan view of the connection portion between the blade and the inducer of the impeller before press-fitting.

FIG. 6 (a) is an enlarged plan view of a connection portion between a blade and an inducer in an impeller of an electric blower according to a sixth embodiment of the present invention; and (b) an enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure

FIG. 7A is an enlarged plan view of a connection portion between a blade and an inducer in an impeller of an electric blower according to a seventh embodiment of the present invention. FIG. 7B is an enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure (c) Exploded perspective view of the connection part between the blade and the inducer of the impeller

FIG. 8A is an enlarged plan view of a connection portion between a blade and an inducer of an impeller of an electric blower according to an eighth embodiment of the present invention. FIG. 8B is an enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure

9A is an enlarged plan view of a connection portion between a blade and an inducer of an impeller of an electric blower according to a ninth embodiment of the present invention. FIG. 9B is an enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure

FIG. 10 (a) is an enlarged plan view of a connection portion between a blade and an inducer in an impeller of an electric blower according to a tenth embodiment of the present invention; and (b) an enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure

FIG. 11 (a) is an enlarged plan view of a connection portion between a blade and an inducer of an impeller of an electric blower according to an eleventh embodiment of the present invention. (B) An enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure

FIG. 12 (a) is an enlarged plan view of a connection portion between a blade and an inducer of an impeller of an electric blower according to a twelfth embodiment of the present invention. (B) An enlarged cross section of a connection portion between the blade and the inducer of the impeller. Figure

FIG. 13 is a partially cutaway side view of a conventional electric blower.

14A is a partially cutaway perspective view of a conventional impeller for an electric blower, FIG. 14B is an enlarged plan view of a blade and an inducer of the impeller, and FIG. 14C is an enlarged sectional view of a blade and an inducer of the impeller.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 21 Impeller main body 22 Rear shroud 23 Front shroud 24 Sheet metal blade 24c Projecting part 25 Resin inducer 27/38/47/78/87/97/107/117
Connection part 37 Inclined surface 77 Uneven part 88 Bar part 89 Hole part 127 Sheet metal hole part 140 Filling part

Claims (13)

[Claims] 1. An electric motor, comprising an impeller rotated by the electric motor, wherein the impeller is sandwiched between the front shroud having an intake port, a rear shroud arranged at a distance from the front shroud, and the shroud. A plurality of sheet metal blades and a resin-made inducer provided on the intake port side of the impeller to rectify the intake air flow, and a part of the inducer has an intake port side end of the sheet metal blade. Electric blower formed with a connecting portion for connecting the air blower. 2. The electric blower according to claim 1, wherein the connecting portion is a fitting portion for fitting an end portion of the sheet metal blade on the side of the intake port. 3. An inclined end portion of the sheet metal blade on the side of the intake port, a connecting portion having an inclined surface in contact with the inclined surface of the sheet metal blade, and an inclined surface of the connecting portion and an inclined surface of the sheet metal blade. 3. The electric blower according to claim 1, wherein the outer shape of the connecting portion is smoothed by contacting and connecting the air blower. 4. The sheet metal blade according to claim 1 or 2, wherein the connecting part is in contact with one side of the end of the inlet of the sheet metal blade, and the direction of the contact is a direction in which the end of the sheet metal blade is pressed against by impeller rotation. Electric blower. 5. The electric blower according to claim 4, wherein a part of the end of the sheet metal blade on the side of the intake port is protruded in a direction in which the blade is pressed, and the protruding part is cut into the connection part. 6. The electric blower according to claim 1, wherein the connecting portion sandwiches both sides of the end of the sheet metal blade on the side of the intake port. 7. The electric blower according to claim 1, wherein an uneven portion is formed in a height direction at an end of the sheet metal blade on an intake port side, and an uneven portion for fitting the uneven portion is formed at a connection portion. . 8. A shroud, wherein a bar-shaped portion whose axial direction is the height direction is provided at an end of the sheet metal blade on the intake port side, and a hole for inserting at least one end of the bar-shaped portion is provided in the shroud. The described electric blower. 9. The electric blower according to claim 1, wherein an outer shape of the connection portion is a shape for smoothing an air flow. 10. The electric blower according to claim 1, wherein a fine uneven portion is provided on a surface of the connecting portion. 11. The electric blower according to claim 1, wherein the connection portion is formed integrally with an end portion of the sheet metal blade on the side of the intake port. 12. The electric blower according to claim 11, wherein a sheet metal hole is formed on a side surface of an end of the sheet metal blade on an intake port side. 13. An electric motor, comprising an impeller rotated by the electric motor, wherein the impeller is sandwiched between the front shroud having an intake port, a rear shroud arranged at a distance from the front shroud, and the shroud. A plurality of sheet metal blades, and a resin inducer provided on the intake port side of the impeller to rectify the intake air flow, wherein an end of the sheet metal blade on the intake port side and the resin inducer are formed. An electric blower with a filling section in the gap.