Centrifugal fan blade

Abstract

The utility model belongs to the technical field of fans, and discloses a centrifugal fan blade which comprises an annular impeller (1), a connecting arm (2), a first blade (3), a second blade (4) and a fan blade cover piece (5), one end of the connecting arm is fixedly connected with the fan blade cover piece, and the other end of the connecting arm is connected with the inner ring wall of the annular impeller. The bottom end of the first blade and the bottom end of the second blade are connected to the top face and the bottom face of the annular impeller respectively, the side, close to the circle center of the fan blade, of the top end (301) of the first blade is in a rounded corner shape, and the side, close to the circle center of the fan blade, of the top end (401) of the second blade is in a rounded corner shape. The air inlet amount of the fan can be increased, air resistance can be reduced, efficiency can be improved, and energy consumption can be obviously reduced under the condition that the same air amount is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans, and in particular relates to a centrifugal fan blade. Background Art

[0002] With the increasing popularity of handheld fans and neck-hanging fans, people have an increasing demand for portable air-cooling fans, and also have certain requirements for air cooling effects and air volume. In the case of unchanged battery capacity, users particularly favor fans that produce more air volume with the same energy consumption, and improving the endurance of fans has also attracted much attention.

[0003] In Chinese patent document CN220452282U, a fan blade is disclosed, the fan blade includes a fan blade connector and a fan blade member, the fan blade connector includes an annular impeller 24 and a connecting arm 25, one end of the connecting arm is connected to the inner ring wall of the annular impeller, the other end of the connecting arm is fixed to the outer wall of the fan blade cover member 26, a plurality of the fan blade members are fixed to the top and bottom surfaces of the annular impeller along the circumferential direction of the fan blade cover member, the fan blade member is in an arc shape, the fan blade member includes a first blade 27 and a second blade 28 that partially extend along the axial direction of the rotating shaft of the fan blade and are arranged along the circumferential direction, at least part of the first blade is located on the top surface of the annular impeller, and at least part of the second blade is located on the bottom surface of the annular impeller. It can be seen that the shape of the blade, the connection method between the annular impeller and the fan blade cover member (the shape of the connecting arm), and the connection method between the blade and the annular impeller all affect the air volume, the wind resistance is large, and it is not conducive to improving the endurance of the fan operation. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a centrifugal fan blade, which can increase the air intake of the fan, reduce wind resistance, improve efficiency, and significantly reduce energy consumption under the condition of achieving the same air volume.

[0005] The utility model embodiment is achieved in this way:

[0006] A centrifugal fan blade comprises an annular impeller, a connecting arm, a first blade, a second blade and a fan blade cover, wherein one end of the connecting arm is fixedly connected to the fan blade cover, and the other end is connected to the inner annular wall of the annular impeller, the bottom end of the first blade and the bottom end of the second blade are respectively connected to the top surface and the bottom surface of the annular impeller, the top end of the first blade is rounded on the side close to the fan blade center, and the top end of the second blade is rounded on the side close to the fan blade center;

[0007] The first blade and the second blade are arranged and distributed along the circumference of the annular impeller, the outer end surface of the first blade is flush with the outer annular surface of the annular impeller, and the outer end surface of the second blade is flush with the outer annular surface of the annular impeller; the inner end surface of the first blade is set beyond the inner annular surface of the annular impeller, and the inner end surface of the second blade is set beyond the inner annular surface of the annular impeller.

[0008] There are multiple connecting arms, which are evenly distributed on the inner circumference of the annular impeller. The connecting arms are curved when viewed from the axial direction of the blades, and the curvature of the connecting arms is convex inward toward the center of the blades.

[0009] Wherein, the inner end surface of the first blade is flush with the inner end surface of the second blade.

[0010] Among them, the distance between the inner annular surface of the annular impeller and the wind blade cover is greater than the length of the inner end surface of the first blade exceeding the inner annular surface of the annular impeller; the distance between the inner annular surface of the annular impeller and the wind blade cover is greater than the length of the inner end surface of the second blade exceeding the inner annular surface of the annular impeller.

[0011] The embodiment of the utility model makes the inner edge of the blade (the side close to the center of the fan blade) into a rounded shape, which is beneficial to air intake and reduces wind resistance, and can reduce energy consumption under the same wind conditions; the inner diameter of the annular impeller is increased on the basis of the existing fan blades, which has the advantage that when it is applied to a fan with single-sided air intake, it is more conducive for air to pass through the inner side of the annular impeller and reach the back blades, which can increase the air volume for the fan with single-sided air intake; the arc of the inner connecting arm of the annular impeller is different from that of the existing fan blades. The arc of the existing fan blades is generally convex outward, while the arc of the connecting arm of the present fan blade is convex inward, which can improve wind resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the front view of the centrifugal fan blade of the utility model;

[0013] Figure 2 It is a rear view of the centrifugal fan blade of the utility model;

[0014] Figure 3 It is a three-dimensional centrifugal fan blade of the utility model. Figure 1 ;

[0015] Figure 4 It is a three-dimensional centrifugal fan blade of the utility model. Figure 2 . DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments:

[0018] like Figures 1 to 4 As shown, a centrifugal fan blade comprises an annular impeller 1, a connecting arm 2, a first blade 3, a second blade 4 and a fan blade cover 5, one end of the connecting arm is fixedly connected to the fan blade cover, and the other end is connected to the inner ring wall of the annular impeller, the bottom end of the first blade and the bottom end of the second blade are respectively connected to the top surface and the bottom surface of the annular impeller, the top end 301 of the first blade is rounded on the side close to the center of the fan blade, and the top end 401 of the second blade is rounded on the side close to the center of the fan blade;

[0019] The first blade and the second blade are arranged and distributed along the circumference of the annular impeller (either staggered or aligned), the outer end face 302 of the first blade is flush with the outer annular surface 101 of the annular impeller, and the outer end face 402 of the second blade is flush with the outer annular surface 101 of the annular impeller; the inner end face 303 of the first blade is set beyond the inner annular surface 102 of the annular impeller, and the inner end face 403 of the second blade is set beyond the inner annular surface 102 of the annular impeller.

[0020] In the figure, there are multiple connecting arms (four in the figure), which are evenly distributed on the inner circumference of the annular impeller. The connecting arms are curved from the axial angle of the fan blades, and the curvature of the connecting arms is convex inward toward the center of the fan blades. Figure 1 and Figure 2 They are all axial angle directions of the fan blades. The connecting arms in the figure are curved and are convex toward the center of the fan blades.

[0021] In the figure, the inner end surface of the first blade is flush with the inner end surface of the second blade.

[0022] In the figure, the distance between the inner annular surface of the annular impeller and the blade cover is greater than the length of the inner end surface of the first blade exceeding the inner annular surface of the annular impeller; the distance between the inner annular surface of the annular impeller and the blade cover is greater than the length of the inner end surface of the second blade exceeding the inner annular surface of the annular impeller.

[0023] In the utility model, the top end 301 of the first blade is rounded on the side close to the center of the fan blade, and the top end 401 of the second blade is rounded on the side close to the center of the fan blade, so that the wind resistance is reduced. Compared with a flat angle shape, the air resistance encountered will be less. The connecting arm is arranged in a curved shape, which reduces the air space ratio between the annular impeller and the fan blade cover, so that more air volume passes through the space between the annular impeller and the fan blade cover. The first blade and the second blade are connected to the annular impeller in a manner that the outer ends are flush and the inner ends protrude, so that the air volume is more concentrated in the space between the annular impeller and the fan blade cover, the air volume intensity is higher, and the air volume is more concentrated and larger when the rotation speed is constant.

[0024] The embodiment of the utility model makes the inner edge of the blade into a rounded shape, which is beneficial to air intake and reduces wind resistance, and can reduce energy consumption under the same wind conditions; the inner diameter of the annular impeller is increased on the basis of the existing fan blades, which has the advantage that when it is applied to a fan with single-sided air intake, it is more conducive for air to pass through the inner side of the annular impeller and reach the back blades, which can increase the air volume for the fan with single-sided air intake; the arc of the inner connecting arm of the annular impeller is different from that of the existing fan blades. The arc of the existing fan blades is generally convex outward, while the arc of the connecting arm of the present fan blades is convex inward, which can improve wind resistance.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A centrifugal fan blade, comprising an annular impeller, a connecting arm, a first blade, a second blade and a blade cover, wherein one end of the connecting arm is fixedly connected to the blade cover, and the other end is connected to the inner annular wall of the annular impeller, and the bottom end of the first blade and the bottom end of the second blade are respectively connected to the top surface and the bottom surface of the annular impeller, characterized in that: The top of the first blade is rounded on one side close to the center of the blade, and the top of the second blade is rounded on one side close to the center of the blade; The first blade and the second blade are arranged and distributed along the circumference of the annular impeller, the outer end surface of the first blade is flush with the outer annular surface of the annular impeller, and the outer end surface of the second blade is flush with the outer annular surface of the annular impeller; the inner end surface of the first blade is set beyond the inner annular surface of the annular impeller, and the inner end surface of the second blade is set beyond the inner annular surface of the annular impeller.

2. A centrifugal fan blade according to claim 1, characterized in that: There are multiple connecting arms, which are evenly distributed on the inner circumference of the annular impeller. The connecting arms are curved when viewed from the axial direction of the fan blades, and the curvature of the connecting arms is convex inwardly toward the center of the fan blades.

3. A centrifugal fan blade according to claim 1, characterized in that: The inner end surface of the first blade is flush with the inner end surface of the second blade.

4. A centrifugal fan blade according to claim 1, characterized in that: The distance between the inner annular surface of the annular impeller and the wind blade cover is greater than the length of the inner end surface of the first blade exceeding the inner annular surface of the annular impeller; the distance between the inner annular surface of the annular impeller and the wind blade cover is greater than the length of the inner end surface of the second blade exceeding the inner annular surface of the annular impeller.

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