JP2020518761A - Impeller, fan and motor - Google Patents

Abstract

An impeller, a fan, and a motor, wherein the impeller (100) includes a wheel hub (11) having a substantially conical shape and a plurality of wheel hubs (11) arranged at intervals along a circumferential direction on an outer peripheral surface of the wheel hub (11). A blade (12) of a blade, the blade including a leading edge surface located at an inlet end and a trailing edge surface located at an outlet end, the blade being a twisted flat blade blade, The trailing edge section of the blade is twisted and inclined with respect to the circumferential direction.

Description

The present invention relates to the field of impellers, and more specifically to impellers and fans and motors having them.

In the vacuum cleaner, the impeller is driven by an electric motor to rotate at a high speed, a negative pressure environment is formed in the closed housing, and dust and the like are sucked into the dust collector to achieve a cleaning effect. Among them, the impeller is an important member of the vacuum cleaner, and its performance directly determines the overall working efficiency of the fan system.

However, the vacuum cleaner in the prior art generally has a drawback that the volume of the fan is large and the performance deteriorates.Therefore, the design of the impeller structure is continuously optimized to improve the operation performance of the vacuum cleaner. There is a need for further improvement.

In view of the above drawbacks or deficiencies of the prior art, the present invention provides an impeller that can optimize and improve the performance of its operation.

In order to achieve the above-mentioned object, the present invention provides an impeller, wherein the impeller has a substantially conical wheel hub and a plurality of wheel hubs arranged at intervals along the outer circumferential surface of the wheel hub along the circumferential direction. Blades, the blades including a leading edge surface located at an inlet end and a trailing edge surface located at an outlet end, the blades being twisted flat blade blades, and The edge section is twisted and inclined with respect to the circumferential direction.

Preferably, the blade trailing edge section is twisted and inclined toward the upstream side with respect to the rotation direction of the impeller.

Preferably, the inclination declination δ at which the blade trailing edge section is twisted and inclined toward the upstream side is 40° or less.

Preferably, the upstream side of the blade trailing edge section is formed as a concave surface and the downstream side is formed as a convex surface, the length of the convex surface being between 50% and 90% of the total length of the blade. Account for %.

Preferably, the front edge surface is an inclined plane with respect to the central axis of the wheel hub, the angle of the inclined plane with respect to the central axis is γ, and 30°≦γ≦90° is satisfied.

Preferably, the blade is connected to an outer peripheral surface of the wheel hub, and extends from the leading edge surface to the trailing edge surface, and a blade root portion, and extends from a top end of the leading edge surface to a top end of the trailing edge surface. And a height of the blade top surface with respect to the blade root portion in a direction extending from the leading edge surface to the trailing edge surface.

Preferably, the blade root edge line of the blade root portion is a smooth curve extending from the bottom end of the leading edge surface to the bottom end of the trailing edge surface.

Preferably, the height b1 of the leading edge surface and the height b2 of the trailing edge surface satisfy 5 mm ≤ b1 ≤ 9 mm and 2 mm ≤ b2 ≤ 5 mm, respectively.

Preferably, the inlet mounting angle of the blade is β1, the outlet mounting angle is β2, and 30°≦β1≦80° and 40°≦β2≦80° are satisfied.

Preferably, on the outer peripheral surface of the wheel hub, the fan-shaped angle of the fan-shaped distribution region of one of the blades is α, and 50°≦α≦100°.

Preferably, 5 to 12 of the vanes are distributed at equal intervals along the circumferential direction on the outer peripheral surface of the wheel hub.

The present invention further provides a fan and a motor, each of which includes the above-mentioned impeller.

According to the above technical solution, the impeller of the present invention has an optimized design for the shape of the blade, and in particular, in the trailing edge section, the blade trailing edge section of the twisted flat blade is located upstream of the impeller rotation direction. By twisting and tilting a predetermined angle toward, the upstream side of the blade trailing edge section is formed as a concave surface, which effectively reduces the fluid loss at the outlet end of the blade and impeller. The effective working range can be expanded and the performance of the impeller operation can be greatly improved.

Other features and advantages of the present invention are described in detail in the specific embodiments section below.

1 is a perspective view of an impeller according to a preferred embodiment of the present invention. It is a front view of the impeller of FIG. It is a top view of the impeller of FIG.

Hereinafter, a specific implementation method of the present invention will be described in detail with reference to the drawings. It should be understood that the specific implementation modes described here are used only for explaining and interpreting the present invention, and not for limiting the present invention.

Note that, if not inconsistent, the embodiments of the present invention and the features of the embodiments can be combined with each other.

In this invention, unless stated to the contrary, the azimuth terms used are generally such that the terms "top", "bottom", "top", "bottom" refer to the direction indicated in the drawings or to the vertical. , Is a term for explaining the mutual positional relationship of each member in the vertical or gravitational direction.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings along with embodiments.

As shown in FIGS. 1 to 3, the present invention includes a substantially conical wheel hub 11, and a plurality of blades 12 arranged on an outer peripheral surface of the wheel hub 11 at intervals along the circumferential direction. An impeller 100 is provided in which each blade 12 includes a leading edge surface 121 located at an inlet end and a trailing edge surface 122 located at an outlet end, the blade 12 being a twisted flat blade blade of the blade 12. The blade trailing edge section is twisted and inclined with respect to the circumferential direction.

Preferably, the blade trailing edge section is twisted and inclined toward the upstream side 21 with respect to the rotation direction w of the impeller 100. The blade trailing edge section is not limited to being twisted on the upstream side 21, and can rotate in the opposite direction of the illustrated rotation direction w with respect to the same impeller 100, but it is inefficient.

Since the trailing edge section of the vane 12 is twisted to the upstream side 21, it is in fluid contact, which is advantageous for drainage, in particular the concave surface 126 after twisting is streamlined or the like. That is, by twisting the trailing edge of the flat blade, the impeller 100 of the present invention can effectively reduce the fluid loss at the outlet end of the blade 12 and increase the working area of the impeller 100 at a small flow rate. The effective work range can be increased, and the operation performance of the impeller 100 can be greatly improved.

Specifically, it is preferable that the trailing edge section of the blade 12 has an inclination declination δ of 40° or less that is twisted and inclined toward the upstream side 21. That is, as shown in FIG. 2, 0≦δ≦40° is satisfied. For example, δ can take 15°, 25°, 40°, etc., and can be specifically set according to the actual situation.

Referring to FIG. 1, after the trailing edge section of the blade 12 is twisted to the upstream side 21, the upstream side of the trailing edge section of the blade 12 is formed as a concave surface 126 and the downstream side is a convex surface. Formed as 125. Among them, the ratio of the length of the convex surface to the entire length of the blade 12 is preferably 50% to 90%. Specifically, each blade 12 extends from the leading edge surface 121 to the trailing edge surface 122 on the outer peripheral surface of the wheel hub 11, and some blades near the trailing edge surface 122 are twisted. After that, the surface located on the upstream side is formed into the concave surface 126, and the surface located on the downstream side is formed into the corresponding convex surface 125, and the length of the convex surface 125 is the length of the blade 12. Limited to 50% to 90% of total length. The streamlined design of the vanes 12 is advantageous in improving the performance of the impeller 100 operation by reducing fluid losses in the vane passages and improving fluid flow characteristics.

Specifically, the front edge surface 121 of the blade 12 is an inclined plane with respect to the central axis of the wheel hub 11 having a substantially conical shape, the angle of the inclined plane with respect to the central axis is γ, and 30°≦ γ≦90° is satisfied, that is, when the fluid flows in from the front edge surface 121 of each blade 12 from the inclined direction, it effectively controls the air volume and pressure at the inlet end of the blade 12, and reduces the fluid loss at the inlet end. Reduce.

The blade 12 is connected to the outer peripheral surface of the wheel hub 11, and extends from the leading edge surface 121 to the trailing edge surface 122, and a blade root portion 124 from the top end of the leading edge surface 121 to the trailing edge surface. A blade top surface 123 extending to a top end of the blade 122, and a height of the blade top surface 123 with respect to the blade root portion 124 in a direction extending from the leading edge surface 121 to the trailing edge surface 122. Gradually decreases. Specifically, from the height b1 of the leading edge surface 121 of the blade 12 to the height b2 of the trailing edge surface 122, the height gradually decreases. Among them, preferably, 5 mm≦b1≦9 mm and 2 mm≦b2≦5 mm are satisfied. In other words, the value b1 of the height of the blade top surface 123 of the leading edge surface 121 of each blade 12 with respect to the blade root portion 124 is the maximum and is limited to 5 mm≦b1≦9 mm, and The height value b2 of the blade top surface 123 of the trailing edge surface 121 of the blade 12 is the minimum and is limited to 2 mm≦b2≦5 mm, and the height between the maximum height b1 and the minimum height b2 of the blade 12 is reduced. Sa gradually decreases. By designing and limiting the height of the blades, the structural strength and operation performance of the blades 12 can be ensured, and by reducing the volume of the blades 12, the weight of the entire fan is reduced.

To achieve a streamlined design, the blade root edge line of the blade root portion 124 is preferably a smooth curve extending from the bottom edge of the leading edge surface 121 to the bottom edge of the trailing edge surface 122. is there.

Further, as shown in FIG. 3, the inlet mounting angle of the blade 12 is β1, the outlet mounting angle is β2, and 30°≦β1≦80° and 40°≦β2≦80° are satisfied. .. Specifically, as also shown in FIG. 1, the blade root edge line of the blade root portion 124 of the blade 12 is a line of intersection between the side surface of the blade 12 and the outer peripheral surface of the wheel hub 11, that is, the surface to surface. And the inlet attachment angle of the vane 12 is the angle between the first tangent and the second tangent at the leading edge of the vane root edge line. The first tangent line is a tangent line of the blade root edge line to the blade root edge line, and the second tangent line is the frontmost edge point of the blade root edge line to the frontmost edge point and the center axis of the wheel hub 11. It is a tangent to a circle whose radius is the distance from. Similarly, the outlet attachment angle is the tangent angle at the last edge point of the blade root edge line, that is, the last edge point is the tangent to the blade root edge line, and the last edge point is the last edge point and the wheel hub 11. Is an angle β2 with a tangent to a circle whose radius is the distance from the central axis of the.

Therefore, by limiting β1 and β2 to 30°≦β1≦80° and 40°≦β2≦80°, it is possible to further reduce the fluid loss at the inlet end and the outlet end.

Preferably, on the outer peripheral surface of the wheel hub 11, the fan angle of the fan-shaped distribution region of one of the blades is α, and 50°≦α≦100°. That is, a radial divergence line between the most upstream point of each blade 12 and the central axis of the wheel hub, a radial divergence line between the most downstream point and the central axis of the wheel hub, and the two radial divergence lines. The angle of the connecting line formed by the line is α, that is, the angle that each blade 12 straddles in the circumferential direction on the outer peripheral surface of the wheel hub 11. In all the impellers 100 referred to in the present embodiment, 5-12 blades 12 are distributed at equal intervals along the circumferential direction on the outer peripheral surface of the wheel hub 11.

Based on the optimized structure of the impeller 100 described above, the present invention further provides a fan including the impeller 100 described above. By adopting the impeller 100, the overall performance of the fan can be improved. In addition, the present invention further provides a motor including the impeller 100 described above, and by adopting the impeller 100, the overall performance of the motor can be improved.

The following was a vacuum cleaner test. Among them, the fans in the vacuum cleaner used different impellers. Specifically, shown in Table 1 are performance test data for examples using the impeller of the present invention and a comparative example using the impeller of the related art.

Among them, the Maydi (aesthetic) S3-L041C vacuum cleaner, which is often seen on the market, is used. The vacuum cleaner in the embodiment of the present invention uses the impeller structure shown in FIGS. 1 to 3, specifically, the blade is a twisted flat blade, and the blade trailing edge section is in the rotational direction w. On the other hand, it is twisted and inclined toward the upstream side 21, and the inclination deviation angles δ in Example 1 and Example 2 are 25° and 35°, respectively, and the convex surface 125 occupying the entire blade length is 60%. The angle γ of the leading edge surface 121 with respect to the central axis is 60°, the height b1 of the leading edge surface is 8 mm, the height b2 of the trailing edge surface is 4 mm, and the inlet mounting angle β1 is The outlet mounting angles β2 are all 60°, eight blades are attached to each impeller, and the fan-shaped angle α of one blade is 85°. The basic structure and parameters of the impeller of the comparative example and the impeller of the present invention are the same, and the difference is that the impeller of the comparative example is a flat blade.

表におけるデータを比較して分かるように、本発明の構造を最適化されたインペラの風量、真空度、及び効率は、従来技術のインペラより著しく高い。

As can be seen by comparing the data in the table, the air volume, vacuum and efficiency of the inventive structure optimized impeller are significantly higher than the prior art impellers.

The preferred embodiment of the present invention has been described in detail above with reference to the drawings. However, the present invention is not limited to the specific details of the above embodiment, and is within the scope of the technical idea of the present invention. In addition, various modifications can be easily made to the technical solution of the present invention, and all these simple modifications are within the protection scope of the present invention.

The specific technical features described in the above specific embodiments can be combined in any appropriate form when they do not contradict each other, and in order to avoid unnecessary duplication, the present invention includes various The possible combinations are not separately described.

Also, any combination between various different embodiments of the present invention can be made, and should be considered as the contents disclosed by the present invention without departing from the spirit of the present invention.

100 Impeller 11 Wheel Hub 12 Blade 121 Leading Edge Surface 122 Trailing Edge Surface 123 Blade Top 124 Blade Root 125 Convex Surface 126 Concave Surface 21 Upstream 22 Downstream δ Inclination Declination γ Angle b1 Leading Edge Height b2 Trailing Edge Surface Height of
W Rotation direction β1 Inlet mounting angle β2 Outlet mounting angle

Claims (13)

An impeller,
The impeller (100) includes a substantially conical wheel hub (11), and a plurality of blades (12) arranged on the outer peripheral surface of the wheel hub (11) at intervals along the circumferential direction. ,
The vane includes a leading edge surface located at an inlet end and a trailing edge surface located at an outlet end, the vane is a twisted flat blade vane, and the vane trailing edge section of the vane is circumferentially oriented. Twist and tilt with respect to
Impeller characterized by that. The blade trailing edge section is twisted and inclined toward the upstream side with respect to the rotation direction (w) of the impeller,
The impeller according to claim 1, wherein: An inclination declination δ at which the blade trailing edge section is twisted and inclined toward the upstream side is 40° or less.
The impeller according to claim 1 or 2, characterized in that. The upstream side of the blade trailing edge section is formed as a concave surface and the downstream side is formed as a convex surface, the length of the convex surface occupying 50% to 90% of the total length of the blade. ,
The impeller according to any one of claims 1 to 3, which is characterized in that. The front edge surface is an inclined plane with respect to the central axis of the wheel hub, the angle of the inclined plane with respect to the central axis is γ, and 30°≦γ≦90° is satisfied.
The impeller according to any one of claims 1 to 4, characterized in that: The blade is connected to the outer peripheral surface of the wheel hub, and extends from the leading edge surface to the trailing edge surface, and the blade root portion extends from the top end of the leading edge surface to the top end of the trailing edge surface. Including the top surface of the blade,
In a direction extending from the leading edge surface to the trailing edge surface, the height of the blade top surface with respect to the blade root portion gradually decreases,
The impeller according to any one of claims 1 to 5, which is characterized in that. The blade root edge line of the blade root portion is a smooth curve extending from the bottom end of the leading edge surface to the bottom end of the trailing edge surface,
The impeller according to claim 6, wherein: The height b1 of the front edge surface and the height b2 of the rear edge surface satisfy 5 mm≦b1≦9 mm and 2 mm≦b2≦5 mm, respectively.
The impeller according to claim 6, wherein: The inlet mounting angle of the blade is β1, the outlet mounting angle is β2, and 30°≦β1≦80° and 40°≦β2≦80° are satisfied,
The impeller according to claim 6, wherein: On the outer peripheral surface of the wheel hub, the fan-shaped angle of the fan-shaped distribution region of one of the blades is α, and 50°≦α≦100°.
The impeller according to any one of claims 1 to 9, which is characterized in that. The outer peripheral surface of the wheel hub is circumferentially distributed with 5 to 12 blades at equal intervals.
The impeller according to any one of claims 1 to 10, which is characterized in that. A fan,
The fan includes the impeller according to any one of claims 1 to 11,
A fan characterized by that. A motor,
The motor includes the impeller according to any one of claims 1 to 11,
A motor characterized by that.

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