Unequal outer diameter blades

Abstract

The present invention discloses a fan blade with unequal outer diameter, comprising a motor shell and blades, wherein a plurality of blades extend outward from the outer circumferential wall of the motor shell, and the distances from the end face of each blade to the center of the motor shell are different. The present invention designs the blades around the fan blade to have different lengths, and the lengths of the blades fluctuate in length within a certain range according to a quasi-sinusoidal wave line, so that the fan blades can maintain balance during operation, and the same vibration frequency of the blades sweeping the wind can be avoided, so that the swept wind areas of the blades are different, and energy concentration under a single frequency is avoided, which greatly reduces the noise generated by the operation of the fan. The lengths of the blades can be calculated according to a formula, and the obtained blade lengths are different and evenly distributed, so that the operation of the fan is balanced.

Description

Technical Field

[0001] The invention relates to a fan, in particular to a fan blade with unequal outer diameters. Background Art

[0002] In general fan blade design, the outermost ends of the blades are at the same diameter. The air volume swept by each blade of such a fan is the same, which easily causes the energy concentration at a certain frequency to produce relatively loud noise, causing trouble when used in a quiet environment. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the present invention provides a fan blade with unequal outer diameters, which greatly reduces the noise generated by the operation of the fan.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a fan blade with unequal outer diameter, including a motor shell and blades, a plurality of blades extending outward from the circumferential outer wall of the motor shell, and each blade end face has a different distance from the center of the motor shell.

[0005] As a further improvement of the present invention, the length of each blade on the outer side of the circumference of the motor housing fluctuates in length along a sinusoidal wave line within a set range.

[0006] As a further improvement of the present invention, the blade length fluctuation values ​​around the motor housing form at least two groups of sinusoidal wavy lines.

[0007] As a further improvement of the present invention, the ends of each blade are respectively located on a circular ring concentric with the motor housing, and the diameter of the circular ring is calculated according to the following formula:

[0008]

[0009] in:

[0010] A is the diameter of the circular ring where the end of the reference blade of the fan blade is located;

[0011] N is the total number of blades on the fan;

[0012] n is the 1st to Nth blade;

[0013] X is the number of peaks on the sinusoidal wave line formed by the blades distributed around the fan blade.

[0014] As a further improvement of the present invention, a fixing ring is further provided, wherein the fixing ring is arranged concentrically with the motor housing, and each blade side wall is fixedly connected to the fixing ring.

[0015] As a further improvement of the present invention, the blades are of a spirally outwardly radiating structure and are evenly distributed on the outer side wall of the motor housing.

[0016] The beneficial effects of the present invention are as follows: the present invention designs the blades around the fan blade to have different lengths, and the lengths of the various blades fluctuate in length within a certain range according to a sine-curve-like wave line, so that the fan blades can maintain balance during operation, and the consistent vibration frequency of the blades sweeping the wind is avoided, so that the wind sweeping areas of the various blades are different, and energy concentration at a single frequency is avoided, which greatly reduces the noise generated by the operation of the fan. The lengths of the various blades can be calculated according to the formula, and the obtained blade lengths are different and evenly distributed, so the balance of the fan operation is maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of the first structure of the present invention;

[0018] Figure 2 is a data diagram of the first embodiment;

[0019] Figure 3 is a data diagram of the second embodiment;

[0020] Figure 4 This is a front view of the second structure of the present invention;

[0021] Figure 5 It is a rear view of the second structure of the present invention. DETAILED DESCRIPTION

[0022] Embodiment: A fan blade with unequal outer diameter includes a motor housing 2 and blades 1, wherein a plurality of blades 1 extend outward from the circumferential outer wall of the motor housing 2, and the distance from the end face of each blade 1 to the center of the motor housing is different.

[0023] Since the length of each blade 1 is different, the wind sweeping area of ​​each blade 1 is different. By controlling the difference in the length of the blade 1 to vary within a smaller range, the change in the wind sweeping area of ​​each blade 1 will not be too large to cause unbalanced operation. This can maintain balanced operation and avoid energy concentration at a single frequency, greatly reducing the noise generated by the operation of the fan.

[0024] The length of each blade 1 on the outer side of the motor housing 2 fluctuates along a sinusoidal wave line within a set range. A reference value is designed for the length of the fan blade 1, and the length of each blade 1 fluctuates within a certain range above and below the reference value. The fluctuation value forms a wave line relative to the reference value, so that the fan blades are balanced during the operation of the fan.

[0025] The fluctuation value of the length of the blade 1 in one cycle of the motor housing 2 forms at least two groups of sinusoidal wavy lines. Through the distribution state of multiple groups of sinusoidal wavy lines, the fluctuation of the length of the blade 1 forms a uniform and balanced distribution, which greatly improves the stability of the fan operation.

[0026] The ends of each blade 1 are respectively located on a circular ring concentric with the motor housing 2, and the diameter of the circular ring is calculated according to the following formula:

[0027]

[0028] in:

[0029] A is the diameter of the circular ring where the end of the reference blade of the fan blade is located;

[0030] N is the total number of blades on the fan;

[0031] n is the 1st to Nth blade;

[0032] X is the peak value of the sinusoidal wave line formed by the blades distributed around the fan blade

[0033] The number of groups.

[0034] A fixing ring 3 is also provided, which is concentrically arranged with the motor housing 2, and the side walls of each blade 1 are fixedly connected to the fixing ring 3. The fixing ring 3 connects the side walls of each blade 1, greatly enhancing the strength of the blade 1 and preventing the blade 1 from being deformed and broken. The fixing ring 3 is as close to the end of each blade 1 as possible, and the blade 1 with a long length can extend out of the fixing ring 3 by a certain distance, and the end of the blade 1 with a short length is just aligned with the fixing ring 3 and connected.

[0035] The blades 1 are spirally radiated outwards and are evenly distributed on the outer wall of the motor housing 2. A larger wind sweeping area is obtained within a smaller range of fan diameter, thereby forming a stronger wind volume. This structure can better gather wind and has greater strength.

[0036] Example 1: The blade lengths of a fan blade having a base diameter of 40 mm and 61 blades are as follows:

[0037]

[0038]

[0039] Example 2: The blade lengths of a fan blade with a base diameter of 40 mm and 37 blades are as follows:

[0040]

[0041]

Claims

1. A fan blade with unequal outer diameters, comprising a motor housing and blades, wherein a plurality of blades (1) extend outward from the outer circumferential wall of the motor housing (2), Features: The distance from each blade end face to the center of the motor housing is different. The length of each blade outside the circumference of the motor housing fluctuates along a sinusoidal wave line within a set range. The ends of each blade are respectively located on a circular ring concentric with the motor housing. The diameter of the circular ring is calculated according to the following formula: in: A is the diameter of the circular ring where the end of the reference blade of the fan blade is located; N is the total number of blades on the fan; n is the 1st to Nth blade; X is the number of peaks on the sinusoidal wave line formed by the blades distributed around the fan blade; It also includes a fixing ring, and each blade side wall is fixedly connected to the fixing ring.

2. The fan blades of unequal outer diameter according to claim 1, Features: The blade length fluctuation values ​​of the motor housing form at least two groups of sinusoidal wave lines.

3. The fan blades of unequal outer diameter according to claim 1, Features: The fixing ring is arranged concentrically with the motor housing.

4. The fan blades of unequal outer diameter according to claim 1, Features: The blades are of a spirally outwardly radiating structure and are evenly distributed on the outer side wall of the motor housing.

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