Blower and the blade structure thereof

The present invention provides a blade structure used in a blower to not only increase the wind pressure and gas quantity but also reduce the noise. The blade structure includes a vane group constituted by a plurality of vanes. A plurality of inclined portions is also included in the blade structure. Each of the plurality of the inclined portions is connected to each of the plurality of vanes of the vane group.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a blade structure and, more particularly, to a blade structure used in a blower.

2. Description of the Related Art

Conventional blowers can be categorized into a single side entry blower and a double side entry blower. As for the single side entry blower, the blade structure used in the blower is a blade structure having equally spaced vanes on a single side. That is, as shown inFIGS. 1A and 1B, all blades11of the blade structure are provided on one side of a supporting plate12. A motor drives the supporting plate to rotate the blade structure. However, such kind of blade structure has the following drawbacks. First, if trying to improve the characteristic of wind pressure, it is necessary to increase the number of the blades of the blade structure so as to increase the wind pressure. However, since the space and size of the blades are limited, the increased number of the blades is inevitably limited. Therefore, it is impossible to make any breakthrough regarding the characteristic of the wind pressure. Second, when the blade structure is rotating, the air stream passes through both the air inlet and the smallest clearance between the vanes and the outer casing13. Since the air passage is reduced drastically from a large size to a small size, the turbulence and noise may be generated easily.

In addition, referring toFIGS. 2A and 2B, the blade structure of another conventional blower includes a plurality of blades21. The blades21are formed at two sides of a supporting annular plate22in an opposite manner to reduce the noise. The number of the blades can be doubled with respect to the above-mentioned blade structure so as to improve the wind pressure characteristic without changing the size of the blower. However, since the added annular plate may decrease the working area and block the passage of the air stream, a predetermined wind pressure and gas quantity may be lost.

In view of the above-mentioned drawbacks in the prior art, the present invention provides an improved blower and the blade structure thereof.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide a blade structure for a blower to not only increase the wind pressure and gas quantity but also reduce the noise.

According to one aspect of the present invention, the blade structure includes a vane group and a plurality of inclined portions. The vane group is constituted by a plurality of vanes. Each of the plurality of inclined portions is connected to each of the plurality of vanes of the vane group.

In addition, the blade structure may further include a base around which the plurality of vanes of the vane group is mounted. The base, the vane group, and the plurality of inclined portions may be integrally formed. The base may be formed with a central opening for a motor driving the blade structure to be mounted therein. Preferably, the plurality of vanes of the vane group may partially protrude from a bottom of the base.

Furthermore, the blade structure may further include a hoop mounted around a top edge of each of the inclined portions.

According to another aspect of the present invention, the vane group and the plurality of inclined portions may be alternately arranged in multiple levels to increase the wind pressure of the guided air stream. Each of the plurality of vanes of the vane group may have a structural type selected from the group consisting of a curved surface, an inclined surface, an arched surface, and a flat surface.

According to still another aspect of the present invention, the blade structure includes a first vane group constituted by a plurality of vanes, a second vane group constituted by a plurality of vanes, and a plurality of inclined portions connected between the vanes of the first and second vane groups. The vanes of the first and second vane groups may be arranged alternately.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring toFIG. 3, which is a pictorial view of a blower3of the present invention, the blower3includes an outer casing32and a blade structure31provided within the outer casing. The outer casing may be composed of a base seat and an upper cover. In addition, the blade structure31includes a first vane group311composed of a plurality of vanes, a second vane group312composed of a plurality of vanes, and a plurality of inclined portions313. As shown inFIG. 4A, the inclined portions313are connected between the vanes of the first vane group and the vanes of the second vane group. Each vane of the first vane group has an outer edge311aand an inner edge311b. Each vane of the second vane group has an outer edge312aand an inner edge312b. Each inclined portion has an outer edge313aand an inner edge313b. According to the invention, the outer edges311a,312aand313aare in the same plane parallel to an axis330of the blower. More specifically, when the blade structure31is viewed from one side, it would be more clearly seen that the outer edges311a,312aand313aare arranged in a line such as the dashed line A–A′, which is included in a vertical plane with respect to the rotation of the rotor. As shown inFIG. 4B, the outer edge of each inclined portion313, the outer edge of each vane of the first vane group, and the outer edge of each vane of the second vane group are in the same plane.

In this embodiment, the vanes of the first vane group311and the second vane group312are arranged in a staggered or alternate manner, as shown inFIG. 4B. Alternatively, the vanes may also be arranged in multiple levels so as to increase the wind pressure of their guided air stream. Consequently, the number of vanes can be greatly increased without changing the size of the blade so as to improve the wind pressure characteristic effectively. The vanes of the first vane group311and the second vane group312may be of a structural type of a curved surface, an inclined surface, an arched surface, or a flat surface. The vanes of the first vane group311and the second vane group312may be made of plastic, metal, or other materials with special applications.

The blade structure further includes a base314for the vanes of the first vane group311and second vane group312to be mounted around. The base314is formed with a central opening315within which a motor for rotating the blade structure is mounted. The vanes of the first vane group311and second vane group312partially protrude from the bottom of the base. In addition, the blade structure further includes a hoop316arranged on the top edges of the vanes of the first vane group so as to reinforce the blade structure31. The base, the first vane group311, the second vane group312, and the inclined portions313may be integrally formed.

Please refer toFIG. 5, which shows the comparative result regarding the characteristic of wind pressure between the blower3of the present invention and the second type of the conventional blower. As shown inFIG. 5, the design of the blade structure31of the present invention, in which the inclined portions are used instead of the annular plate to increase the working area, may significantly increase the wind pressure and the gas quantity, and decrease the noise.

In addition to the above-mentioned embodiment, the blade structure of this invention may also be configured to be the structure as shown inFIG. 6. The difference between this and the above-mentioned embodiments resides in that the blade structure as shown inFIG. 6only includes one vane group412and each of the inclined portions413is connected to each vane of the vane group, respectively. A hoop416is arranged on the top edges of the inclined portions413. The characteristics of the wind pressure and gas quantity are also similar to those of the above-mentioned embodiment.

To sum up, the blade structure of this invention may be applied to the single side entry blower or the double side entry blower. The present invention improves the blade structure with respect to the advantages and disadvantages of the prior art by forming the inclined portions for connecting the upper and lower vanes. Therefore, the fan performance can be improved while the noise can also be reduced.