JP2001289194A - Fan of hollow blade structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the physical properties of a fan material from being deteriorated at the time of recycling by increasing the strength of a fan of hollow vane structure so as to eliminate the mixing of reinforcing materials such as glass fiber into a molding material. SOLUTION: A fan blade 1 comprises a blade body 3 having a recessed part 4 formed therein and a cover member 5 covering the recessed part 4. The hub side connection edge part 10 of the cover member 5 is connected integrally with a hub 2 at a position apart axially a specified distance from the base part 3d of the blade body 3. Thus, the strength of the connection part between the hub 2 and the blade 1 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan having a hollow wing structure.

[0002]

2. Description of the Related Art For example, in an outdoor unit for an air conditioner, an axial flow fan such as a propeller fan is generally used as a blower.

[0003] Conventional fans are known to have a solid wing structure in which no hollow portion is formed in the wing, and a fan having a hollow wing structure in which a hollow portion is formed in the wing.

[0004] The fan has a structure in which a plurality of blades are integrally provided around a central hub, but a connection portion between the hub and the blade (blade base) is required to have a certain strength or more.

[0005] In order to increase the strength of the fan, there is a method of mixing a reinforcing material such as glass fiber into the molding material (for example, polypropylene resin). If glass fibers are mixed, there is a problem that physical properties of the material are deteriorated (particularly, strength is reduced) at the time of reuse. That is, if glass fibers are mixed in the recycled material, most of the glass fibers are cut when the glass fibers are reused, and the glass fiber length is shortened, so that the reinforcing effect is greatly reduced.

Therefore, from the viewpoint of recycling fan materials, it is better to avoid mixing glass fibers into the molding material as much as possible.

On the other hand, in order to increase the strength of the blade base connection portion of the fan, there is a method in which a hollow portion is formed inside the blade to reduce the weight of the blade itself (as a known example which discloses a fan having a hollow blade structure). Is described, for example, in Japanese Patent Application Laid-Open No. 10-22729.
No. 6).

In this known example, as shown in FIGS. 4 and 5, the blades of the fan are divided into an impeller piece (reference numeral 101) and a welding piece (reference number 102). A part (reference numeral 103) is formed.

[0009]

By the way, since the fan described in the above-mentioned prior art has a hollow blade structure, it can be expected that the effect of reducing the weight of the blade portion can be expected to some extent. The structure of the connecting portion 105 and the connecting portion remains the same, and no special reinforcing measures are taken for the connecting portion of the wing base portion 105 to the hub 104 itself.

An object of the present invention is to improve the strength of a blade base connecting portion to a hub in a fan having a hollow blade structure.

[0011]

The present invention is provided with the following means in order to achieve the above object.

First, as shown in FIGS. 1 to 3, a fan according to the present invention comprises a hub 2, a wing body 3 integrally provided on the outer periphery of the hub 2, A concave portion 4 formed on the side surface from the tip 3c side to the hub 2 side, and a lid member 5 joined to the wing body 3 so as to cover the concave portion 4 and form a predetermined hollow portion 6 on the inside. The basic configuration is that the fan has a hollow wing structure.

In the fan according to the present invention, the hub-side joining edge 10 of the lid member 5 is connected to the hub-side base 3 of the wing body 3.
d and a predetermined distance in the axial direction from the hub shaft end side, and is joined and integrated with the hub 2.

The wing body 3 is preferably formed integrally with the hub 2, but depending on the case, the wing body 3 may be separately formed and then integrally joined by an appropriate method.

The cover member 5 includes a wing surface plate portion 9 constituting a wing surface of the fan, and a hub-side joining edge portion 10 serving as a joining portion to the hub 2.
With The hub-side joining edge 10 of the lid member 5 is
The vertical piece 10a extending in the axial direction of the hub 2 and the top surface 2 of the hub 2
and a hook-like shape having a horizontal piece 10b extending in the direction of the central axis along a.

In the hollow wing structure fan of the present invention, as described above, since the hollow portion 6 is formed inside the wing, the weight of the wing portion can be reduced as in the conventional hollow wing structure fan. Since the hub-side joining edge 10 of the lid member 5 is moved toward the hub shaft end side, which is separated from the hub-side base 3d of the wing body 3 by a predetermined distance in the axial direction, and is integrally joined with the hub 2, the blades 1, 1, The strength at the root of the wing with respect to one hub 2 can be improved more than before.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a fan having a hollow blade structure according to the present invention will be described with reference to FIGS.

The fan of the illustrated embodiment is a propeller fan having a hollow blade structure having three blades 1, 1, 1 around a substantially cylindrical hub 2 (the number of blades 1 is arbitrary, such as four). Number).

The blade 1 of this propeller fan is joined and integrated with a blade body 3 having a concave portion 4 on the surface side so as to cover the concave portion 4 with a cover member 5 (between the two). Forms a hollow portion 6).

The three blade bodies 3 are integrally formed with the hub 2 using a polypropylene resin (specific gravity = 1.0 or less) which is a general-purpose molding material. Some molding materials include
Although a reinforcing material such as glass fiber may be mixed in, the reinforcing material such as glass fiber is not used in the illustrated embodiment from the viewpoint of emphasizing recyclability.

The recess 4 is formed from the tip 3c side of the wing body 3 to the hub 2 side (up to the base 3d).

The lid member 5 has a wing surface plate portion 9 covering the concave portion 4 and a hub-side joining edge portion 10 serving as a joining portion to the hub 2.

In the illustrated embodiment, the hub-side joining edge 10
Has a vertical piece 10a extending in the hub axis direction and a horizontal piece 10b extending in the hub center direction. The hub-side joining edge 10 is not limited to the one in which the vertical piece 10a and the horizontal piece 10b have a right-angle hook shape as in the illustrated embodiment, and the top surface 2a of the hub 2 has a curved surface. In such a case, the shape may be a gentle curved shape along the shape.

The cover member 5 covers the recess 4 with its wing surface plate 9 and the hub-side joining edge 10 is in contact with the hub 2 at a predetermined distance from the base 3 d of the wing body 3. And is joined and integrated with the wing body 3 and the hub 2 by a bonding method. Examples of the bonding method include bonding with an adhesive, hot melt, and ultrasonic bonding.

During the operation of the fan, a vibration force is applied to the blade 1 in the directions indicated by arrows XY in FIG. In order to withstand this, the blade base is usually formed thick in the normal case, but in the case of the present invention, it is joined to the hub when the vibration forces in the directions of arrows XY are separated from each other in the direction of the fan axis. (Arrows ab, cd) indicated by arrows a and b, and the vibration load on the base 3d of the wing body 3 is greatly reduced. Therefore, it is possible to make the entire wing body 3 thinner and lighter than before.

The thinner blade body 3 is also effective for shortening the cooling time during molding and preventing so-called "sink".

If one or both of the wing body 3 and the lid member 5 are made of a transparent material, the joined state between the wing face plate 9 of the lid member 5 and the wing body 3 can be visually confirmed.

In the embodiment shown in the drawing, since no foreign matter such as glass fiber is mixed in the molding material, even if the fan is recycled as it is and reused as a material for another product, the physical properties are not changed. There is almost no deterioration, and it is effective in reusing resources.

[0029]

The fan having the hollow wing structure according to the present invention uses the hub-side edge of the lid member 5 covering the recess 4 of the wing body 3 as the joining edge 10 with the hub 2 to reduce the vibration force applied to the wing. Wing body 3
And the cover member 5 so as to be dispersedly supported. Therefore, the vibration force applied to the wing body 3 is reduced, so that the wing body can be made thinner than before so that the weight of the entire fan can be reduced. In addition, since the vibration of the entire wing 1 is reduced, suppression of noise and abnormal noise can be expected.

If the strength can be maintained even when no reinforcing member such as glass fiber is added to the molding material of the fan, there is almost no deterioration in physical properties when the material of the fan is reused, and the resources are recycled. Can also contribute.

[Brief description of the drawings]

FIG. 1 is a front view of a fan having a hollow blade structure according to an embodiment of the present invention.

FIG. 2 is a view of the fan shown in FIG.

FIG. 3 is an enlarged cross-sectional view of a wing portion of the fan shown in FIG. 1 taken along the line III-III.

FIG. 4 is a front view of a wing portion of an example of a conventionally known fan.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

[Explanation of symbols]

1 is a fan blade, 2 is a hub, 3 is a blade body, 4 is a recess, 5
Is a lid member, 6 is a hollow portion, 9 is a wing face plate portion, and 10 is a hub-side joining edge portion.

Claims (3)

[Claims] 1. A hub (2), a wing body (3) integrally provided on the outer periphery of the hub (2), and a hub (2) on one side surface of the wing body (3) from a tip (3c) side. And a lid member (5) joined to the wing body (3) so as to cover the concave portion (4) and form a predetermined hollow portion (6) inside so as to cover the concave portion (4). A fan having a hollow wing structure, comprising: a joining edge portion (10) on the hub side of the lid member (5).
A fan having a hollow wing structure, wherein the fan is brought closer to a hub shaft end side which is separated from the hub side base portion (3d) of the wing body (3) in the axial direction by a predetermined distance and is joined and integrated with the hub (2). 2. A fan having a hollow wing structure according to claim 1, wherein the wing body (3) is formed integrally with the hub (2). 3. A hub-side joining edge (10) of the lid member (5).
The hooks are hooked along the top surface (2a) of the hub (2) so as to be joined and integrated.
The fan having the hollow wing structure described.