JP2020133497A - Fan motor - Google Patents

Abstract

To provide a fan motor that has a high degree of freedom in shape of an impeller while facilitating molding of an impeller and furthermore, manufacturing of a fan motor.SOLUTION: A fan motor includes an impeller 3 formed of a first member (31, 21) and a second member (32, 22). The first member (31, 21) overlaps on the second member (32, 22) in a direction of a rotational axis P. Each of the multiple blades 2 included in the impeller 3 is formed of a first piece 21 included in the first member (31, 21) and a second piece 22 included in the second member (32, 22).SELECTED DRAWING: Figure 3

Description

The present invention relates to a centrifugal fan motor.

A centrifugal fan motor (centrifugal blower) is a fan that sucks air from the center and blows air in the centrifugal direction by rotating an impeller having a plurality of blades (also referred to as blades or impellers). This type of fan comprises an impeller in which a plurality of blades are arranged around the rotation axis of the motor and is housed in a casing having a suction port and an outlet.

The centrifugal fan motor causes the air sucked from the suction port to flow from the center of the impeller between the blades and blows out toward the outside in the radial direction of the blades by the centrifugal action accompanying the rotation of the blades. The air blown out from the outer circumference of the impeller is blown out in all directions with the outer circumference of the casing as the outlet. The ventilation performance and noise of a centrifugal fan motor are greatly affected by the shape of the blades of the impeller.

In recent years, such centrifugal fan motors have been miniaturized and increased in rotation speed. For example, in an electric vacuum cleaner, the diameter of the impeller has been reduced to about 50 mm to 60 mm, and the air volume (suction amount) and the air pressure have been secured by ultra-high rotation of tens of thousands of rotations.

The high-speed air flow due to high rotation has a large effect on quietness due to a slight change in the shape of the wing in the impeller. Therefore, in order to reduce noise, it is required to freely design the shape of the blade. Here, as the material of the impeller, the one made of resin is more advantageous than the one made of metal (aluminum) in that various shapes can be formed relatively freely by molding, and the impeller made of resin is advantageous. The adoption of is increasing.

However, even with a resin impeller, in order to form a wing with a complicated shape, the shape of the mold for mass production becomes complicated, and assembling and removing the mold becomes complicated and molding becomes difficult. ..
The difficulty of moldability is the same even if the material is a metal such as aluminum, to varying degrees.

Japanese Unexamined Patent Publication No. 11-324982 Japanese Unexamined Patent Publication No. 2012-207602

Therefore, an example of the present invention is to provide a fan motor which can easily manufacture an impeller, and thus a fan motor, and has a high degree of freedom in the shape of the impeller.

The fan motor of the present invention includes an impeller formed of a first member and a second member.
The first member and the second member overlap each other in the direction of the rotation axis.
Each of the plurality of blades of the impeller is formed by a first piece of the first member and a second piece of the second member.

In the fan motor of the present invention, the first piece and the second piece extend in the radial direction, and the side surface of the first piece and the side surface of the second piece facing each other come into contact with each other in the circumferential direction. Is preferable.
Further, in the fan motor of the present invention, it is preferable that at least the outer peripheral ends of both side surfaces extending in the radial direction of the blade are inclined in the same direction with respect to the rotation axis. At this time, the contact surface between the first piece and the second piece is along the rotation axis direction, or in the direction opposite to the direction in which the outer peripheral ends of both side surfaces extending in the radial direction of the blade are inclined. It is preferably inclined.
Further, in the fan motor of the present invention, the second piece may be arranged between both ends of the first piece in the radial direction.

In the fan motor of the present invention, the first member has a first substrate.
The second member has a second substrate and
A predetermined gap is provided between the first substrate and the second substrate.
The first piece is arranged so as to project toward the second substrate on the surface of the first substrate facing the second substrate.
The second piece may be arranged so as to project toward the first substrate on the surface of the second substrate facing the first substrate.

At this time, it is preferable that the distance between the first substrate and the second substrate is equal to the height of the first piece and the second piece in the direction of the rotation axis.
Further, at this time, a circular opening may be provided in the central portion of the first substrate.

It is a perspective view of the fan motor which concerns on embodiment which is an example of this invention. It is a cross-sectional view of the fan motor which concerns on embodiment which is an example of this invention, and is the AA cross-sectional view in FIG. It is a perspective view which extracted only the impeller from the fan motor shown in FIG. 1 and FIG. 2 which concerns on embodiment which is an example of this invention. FIG. 3 is a perspective view seen from diagonally above with the impeller of FIG. 3 separated in the vertical direction by the first member and the second member. FIG. 3 is a perspective view seen from diagonally below with the impeller of FIG. 3 separated in the vertical direction by the first member and the second member. FIG. 3 is a plan view of the first member of the impeller of FIG. 3 as viewed from below. FIG. 3 is a plan view of the second member of the impeller of FIG. 3 as viewed from above. It is a perspective view which shows the state of superimposing the 1st member and the 2nd member in the impeller of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a fan motor 1 according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the fan motor 1, and is a sectional view taken along the line AA in FIG.
In the description of the present embodiment, the terms upward and downward mean the vertical relationship in FIG. 2, and do not necessarily match the vertical relationship in the direction of gravity.

The fan motor 1 is blown by the rotation of the impeller 3. The impeller 3 has seven blades 2 which are arranged at equal intervals in the circumferential direction, and the rotation shaft 11 (P) is a central axis by a motor 13 for rotating the impeller built in the fan motor 1. Rotate as. The direction of rotation is counterclockwise in FIG.

The impeller 3 is made of resin and is stored (stored) in the casing 5. There are no restrictions on the type of resin, but since it rotates at an extremely high rotation speed and receives a large wind pressure, it is preferable that the material has strength that can withstand it. For example, as the resin, fiber reinforced plastic (FRP) is used. Can be mentioned.

The casing 5 is composed of a plate-shaped upper casing 51 and a lower casing 52, each of which has a quadrangular outer shape in a plan view, and four columns 7 are formed at four corners of the casing 5 in order to hold both at equal intervals. It is provided in. The upper casing 51 above the fan motor 1 is provided with an air suction port 8, and an air outlet 9 is provided between the columns 7 and the columns 7 of the casing 5. That is, it is an open casing type in which each of the four sides and four directions of the casing 5 serves as an air outlet 9. The casing 5 may be a scroll casing type provided with an outlet for collecting the air blown from the impeller 3 in one direction and then discharging the air.

FIG. 3 shows a perspective view of only the impeller 3 according to the present embodiment extracted from FIGS. 1 and 2. As shown in FIGS. 2 and 3, the impeller 3 has a disk-shaped first disk portion 31 as a first substrate having a circular opening 12 in the center, and a disk-shaped second disk as a second substrate. A plurality of wings 2 provided between the portion 32 and the first disk portion 31 and the second disk portion 32 and arranged on the circumference are provided. The first disk portion 23 and the second disk portion are arranged in parallel with a predetermined interval. The outer diameters of the first disk portion 23 and the second disk portion 32 are the same. The impeller 3 is fixed to a rotating shaft 11 supported by a bearing 14, and is rotatable about the rotating shaft 11 as a central axis.

The first disk portion 31 includes a flat and annular annular portion 31a and a tubular portion 31b that rises upward at the inner peripheral end of the annular portion 31a and surrounds the opening 12. The impeller 3 is arranged in the casing 5 so that the opening 12 projects toward the suction port 8 of the casing 5, and the opening 12 and the suction port 8 communicate with each other.

Each of the wings 2 has a first piece 21 and a second piece 22 extending in the radial direction, and one wing 2 is formed by these two pieces. Further, the first disk portion 31 has the first piece 21, and the second disk portion 32 has the second piece 22. In the present embodiment, the first disk portion 31 and the first piece 21 and the second disk portion 32 and the second piece 22 are integrally molded, respectively. Hereinafter, the description will be continued with the member having the first disk portion 31 and the first piece 21 as the first member 41 and the member having the second disk portion 32 and the second piece 22 as the second member 42.

A perspective view seen from diagonally above is shown in FIG. 4, and a perspective view seen from diagonally below is shown in FIG. 5 in a state where the impeller 3 is separated into the first member 41 and the second member 42 in the vertical direction. Further, FIG. 6 shows a plan view of the first member 41 viewed from below, and FIG. 7 shows a plan view of the second member 42 viewed from above.

In the first member 41, the first piece 21 is arranged in a protruding state on the surface of the first disk portion 31 facing the second disk portion 32. In other words, the first piece is arranged so as to project toward the second disk portion 32 on the surface of the first disk portion 31 facing the second disk portion 32. As shown in FIG. 6, the first piece 21 extends in the radial direction and has an arc shape. In the seven first pieces 21, the arcs drawn by them are concave in the clockwise direction and convex in the counterclockwise direction in a plan view from above the fan motor 1 (plan view from the opposite side to FIG. 6). Are arranged at equal intervals in the circumferential direction so that they face each other. Further, each of the seven first pieces 21 has a concave side surface and a convex side surface, respectively.

On the other hand, in the second member 42, the second piece 22 is arranged in a protruding state on the surface of the second disk portion 32 facing the first disk portion 31. In other words, the first piece is arranged so as to project toward the first disk portion 31 on the surface of the second disk portion 32 facing the first disk portion 31. As shown in FIG. 7, the second piece 22 extends radially and has an arc shape. In the seven second pieces 22, the arcs drawn by them are concave in the clockwise direction and convex in the counterclockwise direction in a plan view from above the fan motor 1 (plan view from the same side as in FIG. 7). They are arranged at equal intervals in the circumferential direction so that they face each other. Further, each of the seven second pieces 22 has a concave side surface and a convex side surface, respectively.

That is, the first piece 21 and the second piece 22 have an arc shape that is convex in the same direction. Further, in the circumferential direction, the convex side surface of the first piece 21 (hereinafter, referred to as "first piece convex side surface") 21x and the concave side surface of the second piece 22 (hereinafter, "second piece concave side surface"). 22y has an arcuate surface that is substantially perpendicular to the vertical direction (that is, along the rotation axis P direction) and has substantially the same curvature in a plan view.

FIG. 8 is a perspective view showing a state in which the first member 41 and the second member 42 are overlapped with each other. The first member 41 and the second member 42 are in the rotation axis P direction (up and down) so that the first one convex side surface 21x and the second one concave side surface 22y come into contact with each other along the alternate long and short dash line in FIG. In the direction), overlap and fix. When the first member 41 and the second member 42 are overlapped with each other, as shown in FIG. 3, the first piece 21 and the second piece 22 are combined to form a wing 2 as a whole. .. At this time, the straight line of the symbol L in the broken elliptical region Z in FIG. 3 is the joint portion between the first piece 21 and the second piece 22.

Further, the concave side surface of the first piece 21 (hereinafter referred to as "first piece concave side surface") 21y and the convex side surface of the second piece 22 (hereinafter referred to as "second piece convex side surface"). 22x is both side surfaces extending in the radial direction of the blade 2 (facing the surface in the circumferential direction). The outer peripheral ends (see the inside of the elliptical region Z of the broken line in FIG. 3) 21a and 22a of the first concave side surface 21y and the second convex side surface 22x are in the same direction with respect to the rotation axis P (in FIG. 3, in FIG. 3). It is inclined to the left) toward the top. This inclination extends substantially in the radial direction on the first one-side concave side surface 21y and the second one-side convex side surface 22x, and the inclination gradually decreases toward the inner peripheral end in the radial direction. The slope is almost gone. That is, the blade 2 has a twisted shape in the rotation axis P direction.

The height of the first piece 21 and the second piece 22 in the rotation axis P direction is equal to the distance between the first disk portion 31 and the second disk portion 32, and the first piece 21 and the second piece 22 are the first disk portion 31. It also plays the role of a spacer between the second disk portions 32. Therefore, steps, seams, and seams are not provided on both side surfaces of the blade 2 extending in the radial direction in the rotation axis P direction.

In the first piece 21, the outer peripheral end in the radial direction is located near the outer periphery of the first disk portion 31, and the inner peripheral end in the radial direction extends so as to protrude into the opening 12 in a plan view. On the other hand, in the second piece 22, the outer peripheral end in the radial direction is at the same position as the first piece 21 (near the outer circumference of the second disk portion 31), but the inner peripheral end in the radial direction is the first piece 21. It is shorter than, and does not reach the opening 12 in plan view. That is, in the radial direction, the second piece 22 is arranged between both ends of the first piece 21. Therefore, the first piece 21 can be visually recognized from the opening 12 when viewed from above.

As described above, in the fan motor 1 of the present embodiment, when the impeller 3 is rotated counterclockwise in FIGS. 1 and 3 with the rotation shaft 11 as the central axis by the motor 13, the second single convex side surface of the blade 2 is projected. A wind flow is generated outward in the radial direction through the flow path formed by the 22x (pressure surface) and the first one-sided concave side surface 21y (negative pressure surface). Therefore, the air outside the fan motor 1 is taken in from the suction port 8, goes outward in the radial direction of the impeller 3, passes between the blades 2 from the opening 12, and is blown out from the outlet 9.

Since the rotational force of the motor 13 forces the air flow through the flow path between the blades 2 and the air flows at an extremely high speed, the shape of the blades 2 in the impeller 3 has an intake or exhaust efficiency and quietness as the fan motor 1. It has a big influence.
In the present embodiment, as described above, by forming the blade 2 into a twisted shape, the rigidity of the blade 2 is improved, the air flow is smoothed, the generation of turbulent flow is suppressed, and the intake air or We are trying to improve exhaust efficiency and quietness.

When the wing 2 having a twisted shape as in the present embodiment is to be molded in the same shape as one of the first disk portion 31 and the second disk portion 32, it is formed from the rotation axis P direction. Even if an attempt is made to use a mold that combines the two members, the diagonal wing 2 portion cannot be die-cut and may not be molded as it is. In order to mold, it is necessary to divide the mold into multiple pieces, which may complicate the mold and complicate the molding work, or increase the work cost and the cost of the mold itself. ..

On the other hand, in the present embodiment, each of the wings 2 is formed of two members, the first piece 21 and the second piece 22. Since the wing 2 is formed of the first piece 21 and the second piece 22, the rigidity is improved. Therefore, although the air flowing at high speed acts on both side surfaces of the blade 2, it is possible to suppress the deformation of the blade 2 when the impeller 3 is rotated, and the air can be efficiently flowed at high speed.

Further, in each of the twisted blades 2, the second single convex side surface 22x (pressure surface) and the first single concave side surface 21y (negative pressure surface) are inclined to the same side with respect to the rotation axis P. By dividing this into the first piece 21 and the second piece 22 on the way, both side surfaces extending in the radial direction of the first piece 21 and the second piece 22 are inclined to the same side with respect to the rotation axis P direction. The side surface of the first piece and the side surface of the second piece, which are in contact with each other in the circumferential direction, are along the rotation axis P.

Specifically, in the first piece 21, the first piece concave side surface 21y (negative pressure surface) is tilted with respect to the rotation axis P, but the first piece convex side surface 21x stands vertically like the rotation axis P ( (Along the rotation axis P), the cross section from the rotation axis P direction is triangular. On the other hand, in the second piece 22, the second piece convex side surface 22x (pressure surface) is tilted with respect to the rotation axis P, but the second piece concave side surface 22y stands up vertically like the rotation axis P (rotation axis). (Along P), and the cross section from the rotation axis P direction is trapezoidal. The first piece 21 is in a state of protruding from the flat portion of the first disk portion 31, and the second piece 22 is in a state of protruding from the flat portion of the second disk portion 32, and each has a triangular or trapezoidal skirt. It is arranged so as to be connected on the spreading side.

The former is integrally molded as the first member 41 and the latter as the second member 42. Therefore, when a mold for combining the two members from the rotation axis P direction is used, the first piece 21 and the second piece 22 of both the first member 41 and the second member 42 are narrowed in the die cutting direction. Since it has a shape (the above-mentioned cross section is triangular or trapezoidal), it can be molded without increasing the number of mold pieces, and it can be easily die-cut after molding.

In the example of the present embodiment, the contact surfaces (the first piece convex side surface 21x and the second piece concave side surface 22y) between the first piece 21 and the second piece 22 are along the rotation axis P direction. From the viewpoint of moldability, the outer peripheral ends (21a, 22a) of both side surfaces extending in the radial direction of the blade 2 may be inclined in the direction opposite to the direction of inclination. In this case as well, as in the case of the present embodiment, the mold can be molded without increasing the number of mold pieces, and the mold can be easily die-cut after molding.

Further, since the height of the first piece 21 and the second piece 22 in the rotation axis P direction is equal to the distance between the first disk portion 31 and the second disk portion 32, both sides extending in the radial direction of the wing 2 are formed. In the direction of the rotation axis P, there are no steps, seams, or seams, the air flow can be smoothed, the generation of turbulent flow can be suppressed, and the intake / exhaust efficiency and quietness can be improved. it can.

Although the fan motor of the present invention has been described with reference to preferred embodiments, the fan motor of the present invention is not limited to the configuration of the above-described embodiment. For example, in the above embodiment, the number of wings 2 is described as an example, but the number of wings 2 is not particularly limited, and even if the number of wings 2 is 6 or less, it is 8 or more. It doesn't matter if there is.

Further, in the above embodiment, the twisted region in each of the blades 2, that is, both side surfaces extending in the radial direction of each of the blades 2 (facing the plane in the circumferential direction) (first single concave side surface 21y (negative)). The region inclined with respect to the rotation axis P on the (pressure surface) and the second single convex side surface 22x (pressure surface)) covers almost the entire length direction (from the outer peripheral end to the inner peripheral end). In, the region of twist is not limited to this. For example, a twisted region may be formed from the outer peripheral end in the longitudinal direction to the middle, and the remaining region may be along the rotation axis P.

In the first place, in the present invention, the shape of the wing is not limited and may not be in a twisted state, or may be a combination of the twist and another shape. The shape of the blade may be designed to be the optimum shape according to various conditions such as the usage environment and purpose, the rotation speed of the fan, the air volume, the size and material of the impeller, and the like. At that time, even if the die-cutting becomes difficult as it is, such as a complicated shape or a twisted shape, according to the present invention, the impeller can be made into two members to cope with various shapes. It can be molded without increasing the number of mold pieces, and can be easily die-cut after molding.

Further, in the above embodiment, as the material of the impeller 3, a resin material which is advantageous in that it is easy to reduce the weight has been described as an example, but a metal material such as aluminum may be used, and the moldability is similarly improved. Can be improved. Further, the first member and the second member may be made of different materials (including a combination of different materials for the resin and the metal as well as the resin and the metal). In addition, other known materials such as ceramics may be used, if desired.

Further, in the above-described embodiment, a configuration in which steps, seams, and seams are not provided on both side surfaces extending in the radial direction of the blade in the rotation axis P direction has been described as an example. , Seams, and seams may be provided.

Further, in the above embodiment, it is assumed that the first piece 21 and the second piece 22 are in a solid state, but they may be in a hollow state, which is preferable from the viewpoint of weight reduction. At this time, there is no partition on the contact surface between the first piece and the second piece (the first piece convex side surface 21x and the second piece concave side surface 22y in the present embodiment), and the first piece and the second piece are one. It may be in a state of forming a cavity. In this case, there is no "face" as an entity between the first piece and the second piece, but the hollow space is regarded as a part of the first piece or the second piece. The inner region of the first piece and the second piece, including the contacting outer diameter contour portion, is regarded as one surface, and is interpreted as the "side surface" and the "contact surface" in the present invention.

In addition, those skilled in the art can appropriately modify the fan motor of the present invention according to conventionally known knowledge. As long as the modification still has the constitution of the present invention, it is, of course, included in the category of the present invention.

1 ... fan motor, 2 ... wing, 3 ... impeller, 5 ... casing, 7 ... strut, 8 ... suction port, 9 ... outlet, 11 ... rotating shaft, 12 ... opening, 13 ... motor, 14 ... bearing, 21 ... 1st piece, 21a ... outer peripheral end, 21x ... first single convex side surface, 21y ... first single concave side surface, 22 ... second piece, 22a ... outer peripheral end, 22x ... second single convex side surface, 22y ... second single concave side Side surface, 31 ... 1st disk part, 31a ... Ring part, 31b ... Cylinder part, 32 ... 2nd disk part, 41 ... 1st member, 42 ... 2nd member, 51 ... Upper casing, 52 ... Lower casing, P …Axis of rotation

Claims (8)

With an impeller formed by the first member and the second member,
The first member and the second member overlap each other in the direction of the rotation axis.
A fan motor in which each of the plurality of blades of the impeller is formed of a first piece of the first member and a second piece of the second member. The first piece and the second piece extend in the radial direction and extend in the radial direction.
The fan motor according to claim 1, wherein the side surface of the first piece and the side surface of the second piece that face each other are in contact with each other in the circumferential direction. The fan motor according to claim 2, wherein at least the outer peripheral ends of both side surfaces extending in the radial direction of the blade are inclined in the same direction with respect to the rotation axis. The contact surface between the first piece and the second piece is inclined in the direction opposite to the direction in which the outer peripheral ends of both side surfaces extending along the rotation axis direction or extending in the radial direction of the blade are inclined. The fan motor according to claim 3. The fan motor according to any one of claims 2 to 4, wherein the second piece is arranged between both ends of the first piece in the radial direction. The first member has a first substrate and
The second member has a second substrate and
A predetermined gap is provided between the first substrate and the second substrate.
The first piece is arranged so as to project toward the second substrate on the surface of the first substrate facing the second substrate.
The fan motor according to any one of claims 1 to 5, wherein the second piece is arranged so as to project toward the first substrate on a surface of the second substrate facing the first substrate. The fan motor according to claim 6, wherein the distance between the first substrate and the second substrate is equal to the heights of the first piece and the second piece in the rotation axis direction. The fan motor according to claim 6 or 7, wherein an opening is provided in the central portion of the first substrate.

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