Low-noise fan blade structure

Abstract

The utility model discloses a low-noise fan blade structure which comprises a hub and a plurality of blades, the blades are distributed along the hub in a circumferential clearance mode, the blades are concave inwards in a wing shape, the chord length of the contact portion of each blade and the hub is L2, the chord length of the end, far away from the hub, of each blade is L1, L2: L1 = 12.5: 27.5, the bending degree of the wing-shaped inner side of each blade is 10 degrees, and the wing-shaped inner side of each blade is 10 degrees. The bending degree of the wing-shaped outer side of the blade is 11 degrees, the wrap angle of the blade is 84 degrees, the hub installation angle alpha of the blade is 48.5 degrees, and the installation angle beta of the end, away from the hub, of the blade is 24.2 degrees. The fan blades are in a wing shape, separation of fluid and the blades under negative pressure is reduced by setting related parameters including chord length, mounting angle, wrap angle and camber of the front edge and the rear edge, the fluid is highly gathered, and the utilization rate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a low noise fan blade structure. BACKGROUND

[0002] With the progress of science and technology, the fan noise quality is increasingly required to be quiet, and the fan blade design also has to improve the negative pressure layer thickness and adjust the forward bending architecture, which faces challenges on the blade shape curved surface. At present, the common fan blade shape is mostly NACA conventional cross section structure, the airflow direction is relatively scattered, and the fluid utilization rate acting on the module is not high. The PQ value of the fan in the free field is relatively large, and the noise is also large, so as to meet the system heat dissipation. How to improve the used efficiency of the fan fluid on the limited structure, the wind gathering design on the blade shape is needed, so as to reduce the equivalent PQ of heat dissipation and the PQ of the free field, thereby reducing the noise, which is the current thinking problem. SUMMARY

[0003] The utility model discloses a low noise fan blade structure to solve the problem in the background art. In order to realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0004] A low noise fan blade structure, comprising a hub, a plurality of blades, the plurality of blades are distributed along the hub with a circumferential gap, the blade is concave inwardly in the airfoil shape, the chord length of the blade contact part with the hub is L2, the chord length of the blade far away from the hub is L1, L2: L1 = 12.5: 27.5, the curvature of the inner side of the airfoil of the blade is 10 degrees, the curvature of the outer side of the airfoil of the blade is 11 degrees, the wrap angle of the blade is 84 degrees, the hub installation angle of the blade is alpha = 48.5 °, the installation angle of the blade far away from the hub is beta = 24.2 °.

[0005] Further, the blade outer side is provided with a wind protection ring.

[0006] Beneficial effect: the fan blade of the utility model adopts the shape of the airfoil, and the relevant parameters: chord length, installation angle, wrap angle and the curvature of the front and rear edges are set to reduce the separation of the fluid and the blade under the negative pressure, make the fluid highly gather, and improve the utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed in the embodiment will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0008] Fig. 1 It is the low noise fan blade structure diagram of the utility model;

[0009] Fig. 2 is a fan blade arrangement structure of the present application;

[0010] Fig. 3 is a fan blade arrangement structure of the present application;

[0011] Fig. 4 is a fan blade arrangement structure of the present application;

[0012] Fig. 5 is a fan blade arrangement structure of the present application;

[0013] Fig. 6 is a fan blade arrangement structure of the present application.

[0014] It should be noted that the drawings are not necessarily drawn to scale, but are only shown in a schematic manner without affecting the understanding of the reader. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0016] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0017] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0018] Furthermore, the terms "mounting", "arrangement", "provided with", "connected", "linked" should be interpreted broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication between two devices, elements or components. The specific meaning of the above terms in the utility model can be understood by the person skilled in the art according to the specific circumstances.

[0019] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific type and structure can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "multiple" is two or more.

[0020] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0021] It should be further understood that the term "and / or" used in the utility model specification and the appended claims means one or more of the associated listed items in any combination and all possible combinations, and includes these combinations.

[0022] As shown in Figs. 1 to 4 The embodiment provides a low-noise fan blade structure, which comprises a hub 1 and a plurality of blades 2, the plurality of blades 2 are distributed in a circumferential gap along the hub 1, the blade 2 is inwardly recessed in an airfoil shape, the chord length of the contact part of the blade 2 and the hub 1 is L2, the chord length of the end of the blade away from the hub is L1, L2: L1 = 12.5: 27.5, the curvature of the inner side 21 of the airfoil of the blade 2 is 10 degrees, the curvature of the outer side 22 of the airfoil of the blade 2 is 11 degrees, the wrap angle of the blade 2 is 84 degrees, the hub installation angle of the blade 2 is α = 48.5°, and the installation angle of the end of the blade 2 away from the hub is β = 24.2°.

[0023] Further, the outer side of the blade 2 is provided with a wind guard ring 3.

[0024] In order to verify the effect of the fan blade structure of the embodiment, specifically, simulation is carried out through the ANSYS simulation software, and a figure is obtained, from which it can be seen that the fluid is well gathered, and the noise can be greatly reduced.

[0025] See Fig. 5The fan blade structure is applied to a corresponding fan system and tested according to the following steps:

[0026] See Fig. 6 The fan is placed in a soundproof room with background noise of 10 dB-A, the Sensor is directly opposite the air inlet of the fan and is 1 meter away from the edge, the fan is 1 meter away from the air inlet, and the fan is tested in a free field, the fan is suspended (the shaft is parallel to the horizon), the rated voltage is adjusted, the dB-A is obtained, the corresponding rotating speed is obtained, and the test conditions are as follows:

[0027]

[0028] The test results are shown in the following table:

[0029]

[0030] As shown in the table, the blade disclosed by the utility model has good heat dissipation effect.

[0031] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form, and the protection scope of the utility model should be subject to the protection scope of the claims. Although the utility model has been disclosed as above, it is not used to limit the utility model, and any skilled person in the art can make some changes or modifications to the equivalent embodiments without departing from the technical scheme of the utility model, as long as the changes or modifications do not depart from the technical scheme of the utility model. Any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model still belong to the scope of the technical scheme of the utility model.

Claims

1. A low-noise fan blade structure, comprising a hub and multiple blades, wherein the multiple blades are distributed circumferentially along the hub, the blades are airfoil-shaped and concave inward, the chord length of the portion of the blade in contact with the hub is L2, the chord length of the end of the blade away from the hub is L1, L2:L1 = 12.5:27.5, the camber of the inner side of the airfoil of the blade is 10 degrees, the camber of the outer side of the airfoil of the blade is 11 degrees, the wrap angle of the blade is 84 degrees, the hub mounting angle of the blade is α = 48.5°, and the mounting angle β of the end of the blade away from the hub is 24.2°.

2. The low-noise fan blade structure according to claim 1, characterized in that: A wind-protecting ring is provided on the outer side of the blade.

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