JP2877526B2 - Electric blower impeller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller used for an electric blower. In particular, the present invention relates to an impeller in which a projection of a fan blade is caulked and fixed to a connection hole of a fan plate.

[0002]

2. Description of the Related Art An impeller of an electric blower in which a fan blade is connected to a fan plate is disclosed in JP-A-2-91500.
No., published in Japanese Patent Application Publication No. In the impeller described in this publication, fan blades are radially fixed between two fan plates. The fan plate and the fan blade are connected in a caulking process. For this reason, a connection hole is provided in the fan plate, and a protrusion is provided in the fan blade. The projection of the fan blade is inserted into the connection hole of the fan plate, and the projection is caulked to connect the fan blade to the fan plate.

FIGS. 16 to 21 show a connecting portion between the fan blade 1 and the fan plate 2. FIG. 16 to 18 show a state before the projection 3 is caulked, and FIGS. 19 to 21 show a state after the projection 3 is caulked.
In the impellers shown in these figures, a projection 3 is provided on the fan blade 1, and a connection hole 4 for inserting the projection 3 is formed in the fan plate 2. As shown in FIGS. 16 to 18, the protrusion 3 of the fan blade 1 is inserted into the connection hole 4 of the fan plate 2. Thereafter, as shown in FIGS. 19 to 21, the projection 3 has its head crushed in a caulking step,
It is fixed to the connecting hole 4 so as not to come off. As shown in FIG. 18, the connection hole 4 of the fan plate 2 is larger than the projection 3 so that the projection 3 of the fan blade 1 can be inserted. The opening width W of the connection hole 4 is designed to be larger than the thickness A of the projection 3. It connects the projection 3 to the connection hole 4
This is for smooth insertion.

[0004]

The conventional impeller shown in these figures has a fan plate 2 and a fan blade 1.
However, there is a disadvantage that a gap is formed between the connection hole 4 and the projection 3 in a state where both are connected. This is because, as shown in FIGS. 16 to 21, the opening width W of the connection hole 4 is larger than the thickness A of the projection 3. When a gap is formed in the swaged portion, a part of the wind sent from the suction port of the impeller to the outer periphery of the impeller leaks from the gap, thereby lowering the impeller efficiency.

The gap formed in the caulked portion can be eliminated by making the connecting hole 4 of the fan plate 2 equal to or smaller than the projection 3 of the fan blade 1 and pressing the projection 3 into the connecting hole 4. However, this structure deteriorates the workability of assembly. In addition, there is a disadvantage that the fan blade and the fan plate are deformed by the force received at the time of press-fitting, and the weight balance of the fan is lost.

Further, in the conventional impeller, in the caulking step, as shown in FIG. This is because when the head of the projection 3 is pressed and crushed, a caulking pressure acts. In particular,
In the conventional impeller, since the peripheral edge of the fan blade 1 is made to project at the same thickness as the projection 3, the strength of the plate material with respect to the projection 3 cannot be increased. For this reason, the pressure at the time of caulking the projections 3 strongly presses the plate material through the projections 3 and causes distortion.

[0007] The distortion generated in the manufacturing process deteriorates the dynamic balance of the impeller. An unbalanced impeller vibrates violently at high speeds. In particular, this type of impeller accelerates air with centrifugal force and blows it.
In order to efficiently accelerate air, it is necessary to rotate at high speed. Therefore, it is extremely important for the impeller having this structure how to reduce the imbalance in dynamic balance.

[0008] The present invention has been developed to solve these disadvantages of the conventional impeller,
An important object of the present invention is to provide an impeller of an electric blower which can eliminate a gap at a caulked portion between a fan plate and a fan blade and can prevent a loss caused by a leak of draft.

Another important object of the present invention is to provide an impeller of an electric blower which can improve the workability at the time of assembling the impeller and can assemble without deteriorating the balance.

[0010]

The impeller of the electric blower according to the present invention comprises two fan plates 2 which are spaced apart from each other and are opposed to each other. A plurality of fan blades for partitioning a space between the fan plates; A connection hole 4 is opened in the fan plate 2. The fan blade 1 has a projection 3 that can be inserted into the connection hole 4. The protrusions 3 of the fan blade 1 are inserted into the connection holes 4 of the fan plate 2, and the protrusions 3 are caulked with a plurality of peaks 11 arranged side by side at intervals in the direction in which the fan blade 1 extends. 1 is connected to the fan plate 2.

Further, in the impeller of the present invention, the thickness of the projection 3 is made smaller than the thickness of the plate material constituting the fan blade 1 in order to prevent drafts between the fan blade 1 and the fan plate 2. , Fan plate 2
The size of the connection hole 4 opened at the bottom is set to be larger than the thickness of the projection 3 and smaller than the thickness of the blade material of the fan blade 1.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below are examples of an electric blower and an impeller for embodying the technical idea of the present invention. It is not specified in the following structure. Various changes can be made to the impeller of the present invention based on the scope described in the claims.

Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members shown in the embodiments are indicated by "the claims" and "the conventional problems are solved." In the column of "Means for Means".
However, the members described in the claims are not limited to the members of the embodiments.

FIG. 1 is a sectional view of an electric blower equipped with an impeller. The electric blower shown in FIG.
The impeller 6 is fixed to the rotating shaft of the. Impeller 6
, A fan cover 7 is fixed. In the electric blower having this structure, the wind sucked from the suction port 8 of the fan cover 7 is accelerated by the impeller 6, passes through the diffuser 9, and is discharged to the outside from the bracket.

The impeller 6 is shown in a plan view in FIG. 2 and a sectional view in FIG. The impellers shown in these figures are composed of two fan plates 2 arranged vertically apart.
And a fan blade 1 that partitions the space between the fan plates 2. The fan plate 2 on the upper surface is inclined so that an air suction hole is opened at the center and the center portion is higher. The fan plate 2 on the lower surface is processed into a planar disk shape. The curved fan blades 1 are fixed radially between the fan plates 2.

The fan blade 1 and the fan plate 2 are connected by caulking the projection 3 of the fan blade 1.
The structure of the connecting portion between the fan blade 1 and the fan plate 2 is shown in FIGS. The fan plate 2 shown in these figures has a square connection hole 4 opened. On the other hand, the fan blade 1 is provided with a projection 3 to be inserted into the connection hole 4. As shown in FIG. 4, the thickness of the projection 3 is processed to be smaller than the thickness of the blade material constituting the fan blade 1. In order to make the projection 3 thinner than the blade material, when punching the fan blade 1 with a mold,
An extra pressure is applied to the projection 3 to make it thin.

The connecting hole 4 is larger than the outer shape of the projection 3 so that the projection 3 can be smoothly inserted therein. The connecting hole 4 is designed to be larger than the protrusion 3 but smaller than the plate thickness of the blade material of the fan blade 1 so that there is no gap when the protrusion 3 is inserted and caulked and fixed here. As shown in FIG. 6, when the thickness of the projection 3 is A and the thickness of the blade material of the fan blade 1 is B, the opening width C of the connection hole 4 is designed to a value satisfying A <C <B. Is done. As shown in FIG. 4, when the projection 3 is inserted, the connection hole 4 designed in this range is closed by the blade material of the fan blade 1 which is thicker than the connection hole 4. The length L of the connection hole 4 is designed to be slightly longer than the length D of the projection 3. Even if the length L of the connection hole 4 is slightly increased, no gap is formed between the connection hole 4 and the projection 3. This is because the fan blade 1 is closed at the peripheral edge.

FIGS. 7 to 13 show a state in which the projection 3 is fixed by being caulked in the connection hole 4. 7 and 8, the head of the projection 3 inserted into the connection hole 4 is crushed so as to form the inclined groove 10, expanded in the width direction, and fixed by caulking. 9 and 10, two ridges 11 are provided on the head of the projection 3, and the ridges are crushed and caulked. The projection 3 whose head is swaged has a thick upper end so that it cannot be pulled out of the connection hole 4. As shown in FIG. 11, the fan blade 1 connected to the fan plate 2 in this state makes the upper edge of the blade material closely adhere to the lower surface of the fan plate 2, and the gap of the connection hole 4 is closed. That is, the gap between the connection hole 4 and the projection 3 is closed by the upper end surface of the plate material. For this reason,
It is possible to prevent air leakage at the swaged portion generated in the conventional impeller and improve the fan efficiency.

Further, as shown in FIG. 14, the fan blade 1 may be provided with a projection 3 having a curved upper end edge of the blade material. Fan blade 1 of this shape
The curved surface contacts the lower surface of the fan plate 2 and
Close the gap.

[0020]

The impeller according to the present invention has a structure that can easily and efficiently mass-produce, suppresses air leaks generated in the connection holes, and improves the fan efficiency.
This is because a connection hole larger than the protrusion of the fan blade can be opened to caulk and connect the fan plate and the fan blade. That is, in the impeller of the present invention, the protrusion is smaller than the blade material of the fan blade, and the connection hole is larger than the protrusion and smaller than the thickness of the blade material of the fan blade. Insert the fan blade projection into the
The gap between the caulked portion between the fan plate and the fan blade, which has conventionally occurred, cannot be formed. In this state, even if the projections inserted into the connection holes are connected by employing a method such as squeezing the tip of the head and caulking, no gap is generated in the caulked portion.

Further, since a plurality of protrusions of the fan blade are arranged in parallel at intervals in the direction in which the fan blade extends, not only the thickness direction of the fan blade but also the direction in which the fan blade extends. The pressing can be performed, and the rattling of the fan blade can be more reliably suppressed, and the deviation of the dynamic balance can be suppressed. Further, there is a feature that the distortion generated during the caulking step can be suppressed, and the deviation of the dynamic balance caused by the distortion can be suppressed. This is because, as shown in FIG. 15, the protrusion is made thinner than the thickness of the blade material of the fan blade. When caulking this shaped protrusion,
The caulking pressure acts on the blade material, which is thicker than the projections, as shown by arrows. Further, the blade material thicker than the projection has a higher strength than the projection, and the projection is not deformed even when pressed through the projection, so that the blade material is not deformed. For this reason, the distortion generated in the caulking step is reduced, the impeller has a good dynamic balance, and there is a characteristic that the vibration generated during high-speed rotation can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electric blower equipped with an impeller.

FIG. 2 is a plan view of an impeller.

FIG. 3 is a sectional view of an impeller.

FIG. 4 is a cross-sectional view of a connection portion between a fan blade and a fan plate of an impeller, showing one embodiment of the present invention.

FIG. 5 is a perspective view of a connection portion between a fan blade and a fan plate of an impeller, showing one embodiment of the present invention.

FIG. 6 is a plan view of a connection portion between a fan blade and a fan plate of an impeller, showing an embodiment of the present invention.

FIG. 7 is a plan view showing a state where a projection is swaged.

FIG. 8 is a sectional view of the protrusion shown in FIG. 7;

FIG. 9 is a plan view showing a state in which a protrusion is swaged.

FIG. 10 is a sectional view of the protrusion shown in FIG. 9;

FIG. 11 is a cross-sectional view showing a state where a projection is swaged.

FIG. 12 is a longitudinal sectional view of the protrusion shown in FIG. 11;

FIG. 13 is a plan view of the protrusion shown in FIG. 11;

FIG. 14 is a cross-sectional view showing a state where a protrusion is inserted into the connection hole 4;

FIG. 15 is a perspective view showing a caulking pressure acting on a projection.

FIG. 16 is a perspective view showing a projection and a connection hole portion of a conventional impeller.

FIG. 17 is a cross-sectional view showing a protrusion and a connection hole portion shown in FIG. 16;

FIG. 18 is a plan view showing a protrusion and a connection hole portion shown in FIG. 16;

FIG. 19 is a cross-sectional view of a conventional impeller, in which a crimping portion of a projection and a connection hole is provided.

FIG. 20 is a longitudinal sectional view of a projection and a connection hole shown in FIG. 19;

FIG. 21 is a plan view of a protrusion and a connection hole shown in FIG.

FIG. 22 is a perspective view showing distortion generated in a foot portion of a projection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fan blade 2 Fan plate 3 Projection 4 Connection hole 5 Motor 6 Impeller 7 Fan cover 8 Inlet 9 Diffuser 10 Inclined groove 11 Mountain

Claims (1)

(57) [Claims] 1. Two fan plates (2) arranged opposite to each other, and a plurality of fan plates (2) radially arranged between the fan plates (2) to partition a space between the fan plates (2). The fan plate (2) is provided with a connecting hole (4), the fan blade (1) is provided with a protrusion (3), and the fan blade (1) is provided with a projection (3). The projection (3) is inserted into the connection hole (4) of the fan plate (2),
In the impeller in which the projection (3) is caulked and the fan blade (1) is connected to the fan plate (2), the peak (11) of the projection (3) of the fan blade (1) is connected to the fan blade (1). A plurality of protrusions (3) are arranged side by side at intervals in the extending direction, and the thickness of the projection (3) is made smaller than the thickness of the blade material constituting the fan blade (1). An impeller for an electric blower, wherein the size of the opened connection hole (4) is set to be larger than the thickness of the projection (3) and smaller than the thickness of the blade material of the fan blade (1).