A high-efficiency centrifugal wind wheel and fan

Abstract

The present invention provides a high-efficiency centrifugal wind wheel and fan, which relates to the technical field of centrifugal fans, including a wheel disc and a wheel cover, wherein the wheel disc and the wheel cover are provided with a plurality of blades; the plurality of blades are equidistantly arranged around the rotation center of the centrifugal wind wheel; an air inlet is formed at the center of the wheel cover, and an air outlet is formed between adjacent blades; along the blade height direction, the blade root is connected to the wheel disc, and the blade tip is connected to the wheel cover; the blade is arranged into an airfoil structure, and along the chord length direction, includes an air inlet portion located at the leading edge, a middle portion, and an air outlet portion located at the trailing edge, and the thickness of the air inlet portion and the air outlet portion is less than the thickness of the middle portion, and the maximum thickness of the middle portion is set to L, then L=1.5 to 3.5 mm. The benefit of the present invention is that it relates to an integrated wind wheel that can meet the requirements of compact structure, high static pressure, and high efficiency, and can meet the flow range: 500-640m 3 / h, the maximum pressure is 520Pa, the wind wheel efficiency is 30.21%, which is 4.31% higher than that of peers. The structure can fully cover the standard products of peers.

Description

Technical Field

[0001] The present invention relates to the technical field of backward centrifugal fans, and in particular to a high-efficiency centrifugal fan wheel and fan used in indoor fresh air, purifiers, RV air conditioners, heat pumps, power electronics and other industries. Background Art

[0002] The centrifugal impeller used in centrifugal fans refers to a wind wheel with axial air intake and radial air discharge, which uses centrifugal force to do work to increase the air pressure. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and air intake of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and selection of grains; inflation and propulsion of wind tunnel wind sources and hovercraft, etc. The working principle of centrifugal fans is basically the same as that of turbine compressors, but due to the low gas flow rate and small pressure change, it is generally not necessary to consider the change in gas specific volume, that is, the gas is treated as an incompressible fluid.

[0003] Centrifugal fans are an indispensable component of industries such as refrigeration and ventilation. However, there is an airflow boundary layer on the suction surface of the wind wheel blades, and as the centrifugal fan rotates, the airflow boundary layer continuously falls off from the trailing edge of the wind wheel blades, generating a large number of airflow vortices, thereby increasing the vortex noise of the wind wheel. In other words, there is room for improvement in the existing technology. Summary of the invention

[0004] The present invention overcomes the shortcomings of the prior art and provides a high-efficiency centrifugal wind wheel having the advantages of compact structure, high static pressure and high efficiency.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] A high-efficiency centrifugal wind wheel comprises a wheel disc and a wheel cover, wherein the wheel disc and the wheel cover are provided with a plurality of blades; the plurality of blades are arranged equidistantly around the rotation center of the centrifugal wind wheel; an air inlet is formed at the center of the wheel cover, and air outlets are formed between adjacent blades; along the blade height direction, the blade root is connected to the wheel disc, and the blade top is connected to the wheel cover;

[0007] The blade is configured as an airfoil structure, including an air inlet portion located at the leading edge, a middle portion, and an air outlet portion located at the trailing edge along the chord length direction, and the thickness of the air inlet portion and the air outlet portion is less than the thickness of the middle portion, and the maximum thickness of the middle portion is set to L, then L=1.5 to 3.5 mm, and the maximum thickness L is located at 30%-40% of the chord length from the leading edge to the trailing edge along the chord length;

[0008] The blade outlet angle is set to α, which is between 10 and 22 degrees. From the blade root to the blade tip, the outlet angle α on each cross section gradually decreases, and the difference between the maximum angle and the minimum angle is 4 to 6 degrees.

[0009] Furthermore, γ is set as the blade inlet angle, and the setting range of γ is 9 to 17 degrees. From the blade root to the blade tip, the inlet angle γ on each cross section remains basically unchanged.

[0010] Furthermore, the outer diameter edge of the wheel cover is formed with a slightly upturned shape for increasing pressure, and the upturned angle is set to R, and R is limited to 5 to 30 degrees.

[0011] Furthermore, the wheel disc is provided with an arc structure, wherein the arc radius at the outlet position is relatively small, and the diameter is between 5 and 10 mm.

[0012] Furthermore, the surfaces of the wheel disc and the wheel cover are both provided with annular stripes.

[0013] Furthermore, a balancing sheet is provided at the air inlet and / or the air outlet.

[0014] The present invention also seeks to protect a wind turbine, comprising a motor and the above-mentioned high-efficiency centrifugal wind wheel, wherein a labyrinth connection structure is formed between the rotor housing of the motor and the wheel cover of the high-efficiency centrifugal wind wheel.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The blade of the present invention is set as an airfoil structure, including an air inlet portion located at the leading edge, a middle portion and an air outlet portion located at the trailing edge along the chord length direction, and the thickness of the air inlet portion and the air outlet portion is less than the thickness of the middle portion, and the maximum thickness of the middle portion is set to L, and the maximum thickness L is located at 30%-40% of the chord length from the leading edge to the trailing edge along the chord length. Through various test surfaces, the design can meet the flow range: 500-640m 3 / h, the maximum pressure is 520Pa, the wind wheel efficiency is 30.21%, which is 4.31% higher than that of peers. The structure can fully cover the standard products of peers, and has the advantages of compact structure, high static pressure and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 is a cross-sectional view of the centrifugal wind wheel of the present invention;

[0019] Figure 2 is a plan view of the centrifugal wind wheel of the present invention as viewed from the wheel cover direction;

[0020] Figure 3 yes Figure 2 A magnified image of the circled position in the middle;

[0021] Figure 4 This is a schematic diagram of the structure of the centrifugal wind wheel after the motor is installed;

[0022] Figure 5 This is a cross-sectional view of the centrifugal wind wheel after the motor is installed;

[0023] Figure 6 It is a schematic diagram of the joint between the wheel cover of the centrifugal wind wheel and the rotor housing of the motor;

[0024] Figure 7 This is a diagram of the air volume data of a competitor's centrifugal wind wheel of the present invention.

[0025] In the figure:

[0026] 1. Roulette; 101. Arc structure; 2. Wheel cover; 3. Blades; 301. Air inlet; 302. Middle part; 303. Air outlet; 4. Air inlet; 5. Air outlet; 6. Stripes; 7. Balance sheet; 8. Motor; 9. Labyrinth combination structure. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] like Figures 1 to 4 As shown, the present invention claims protection for a high-efficiency centrifugal wind wheel, including a wheel disc 1 and a wheel cover 2, wherein the wheel disc 1 and the wheel cover 2 are provided with a plurality of blades 3; the wheel disc 1, the wheel cover 2 and the blades 3 are connected as a whole to form a centrifugal wind wheel, and the centrifugal wind wheel is made of plastic, which is light in weight and low in cost; the plurality of blades 3 are equidistantly arranged around the rotation center of the centrifugal wind wheel; along the blade height direction, the blade root of the blade 3 is fixedly connected to the wheel disc 1, and the blade top of the blade 3 is fixedly connected to the wheel cover 2. In this embodiment, the number of blades 3 is 7, which are evenly distributed.

[0029] An air inlet 4 is formed at the center of the wheel cover 2 , and an air outlet 5 is formed between adjacent blades 3 ; when the high-efficiency centrifugal wind wheel rotates, wind enters from the air inlet 4 and is finally discharged from the air outlet 5 .

[0030] In the present invention, Figure 3As shown, the blade 3 is configured as an airfoil structure, including an air inlet portion 301 located at the leading edge, a middle portion 302 and an air outlet portion 303 located at the trailing edge along the chord length direction, and the thickness of the air inlet portion 301 and the air outlet portion 303 is less than the thickness of the middle portion 302. The maximum thickness of the middle portion 302 is set to L, then L=1.5 to 3.5 mm, and the maximum thickness L is located at 30%-40% of the chord length from the leading edge to the trailing edge along the chord length; in the present embodiment, L=2.5 mm, and the maximum thickness L is located at 35% of the chord length from the leading edge to the trailing edge along the chord length; the blade outlet angle is set to α, then α is between 10 and 22 degrees, and the outlet angle α on each cross section gradually decreases from the blade root to the blade top, and the difference between the maximum angle and the minimum angle is 4 to 6 degrees; in the present embodiment, the difference between the maximum angle and the minimum angle is 5 degrees.

[0031] If γ is set as the blade inlet angle, the setting range of γ is 9 to 17 degrees, and the inlet angle γ on each section from the blade root to the blade tip is basically unchanged. The thickness of the airfoil structure, the blade outlet angle α, and the blade inlet angle γ are set in various structures to help increase the air volume generated when the centrifugal wind wheel rotates.

[0032] In addition, from Figure 1 It can be seen that the outer diameter edge of the wheel cover 2 is formed with a slightly upturned shape for boosting. The upturned angle is set to R, and R is limited to 5 to 30 degrees. This structure setting has a boosting effect, effectively improves the efficiency of the wind wheel, and improves the noise.

[0033] from Figure 1 It can be seen that the wheel 1 is provided with an arc structure, wherein the arc radius at the outlet position is relatively small, with a diameter between 5 and 10 mm. The large arc is related to the size of the motor, and a flange structure is designed at the outlet position of the wheel, and the flange size is related to the small arc radius. This makes the centrifugal fan wheel have a good air outlet effect and the product running noise will be smoother.

[0034] The surfaces of the wheel disc 1 and the wheel cover 2 are both provided with annular stripes 6, which form a certain wind flow due to wind resistance when the surfaces of the wheel disc 1 and the wheel cover 2 rotate, thereby also achieving the purpose of increasing the wind volume generated when the centrifugal wind wheel rotates.

[0035] In this embodiment, in order to be suitable for different products and installations by different customers, a balancing sheet 7 can be installed at the air inlet 4 and / or the air outlet 5 according to actual conditions, which is beneficial to improving the stability of the operation of the centrifugal wind wheel and preventing vibration and noise from occurring during operation.

[0036] The present invention also claims protection for a fan, including a motor 8 and the above-mentioned high-efficiency centrifugal wind wheel, wherein the rotor housing of the motor 8 rotates to drive the centrifugal wind wheel to rotate, thereby Figure 6It can be seen that a labyrinth connection structure 9 is formed between the rotor housing of the motor 8 and the wheel cover 2 of the high-efficiency centrifugal wind wheel, which can enhance the tightness and sealing between the two and achieve the purpose of waterproof penetration.

[0037] The performance of one of the centrifugal wind wheels of the present invention was tested, and the following test data were obtained:

[0038]

[0039] We selected products from other companies for performance testing and obtained the following test data:

[0040]

[0041] From the above test data, it can be seen that the maximum static pressure efficiency of the centrifugal wind wheel of the present invention is 30.21%, which is 4.13% higher than that of the competitor's products, and the structural dimensions can fully cover the competitors' products; and the centrifugal wind wheel of the present invention and the competitors' products are tested for air volume, and the following results are obtained: Figure 7 As shown in the air volume data diagram, it can be seen from the diagram that the unit air volume of the centrifugal wind wheel of the present invention is higher than that of products of competitors, with larger air volume and higher efficiency.

[0042] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency centrifugal wind wheel, characterized in that: The invention comprises a wheel disc (1) and a wheel cover (2), wherein the wheel disc (1) and the wheel cover (2) are provided with a plurality of blades (3); the plurality of blades (3) are arranged equidistantly around the rotation center of the centrifugal wind wheel; an air inlet (4) is formed at the center of the wheel cover (2), and air outlets (5) are formed between adjacent blades (3); along the blade height direction, the blade root of the blade (3) is connected to the wheel disc (1), and the blade top of the blade (3) is connected to the wheel cover (2); The blade (3) is configured as an airfoil structure, and comprises an air inlet portion (301) located at a leading edge, a middle portion (302), and an air outlet portion (303) located at a trailing edge along the chord length direction, and the thickness of the air inlet portion (301) and the air outlet portion (303) is smaller than the thickness of the middle portion (302), and the maximum thickness of the middle portion (302) is set to L, then L=1.5 to 3.5 mm, and the maximum thickness L is located at 30%-40% of the chord length in the direction from the leading edge to the trailing edge along the chord length; The blade outlet angle is set to α, which is between 10 and 22 degrees. From the blade root to the blade tip, the outlet angle α on each cross section gradually decreases, and the difference between the maximum angle and the minimum angle is 4 to 6 degrees.

2. The high-efficiency centrifugal wind wheel according to claim 1, characterized in that: Assuming γ is the blade inlet angle, the setting range of γ is 9 to 17 degrees. From the blade root to the blade tip, the inlet angle γ on each section remains basically unchanged.

3. The high-efficiency centrifugal wind wheel according to claim 2, characterized in that: The outer diameter edge of the wheel cover (2) is formed with a slightly upward tilt for increasing pressure, and the upward tilt angle is set to R, and R is limited to 5 to 30 degrees.

4. The high-efficiency centrifugal wind wheel according to claim 2, characterized in that: The wheel disc (1) is provided with an arc structure (101), wherein the arc radius at the outlet position is relatively small, with a diameter between 5 and 10 mm.

5. The high-efficiency centrifugal wind wheel according to claim 1, characterized in that: The surfaces of the wheel disc (1) and the wheel cover (2) are both provided with ring-shaped stripes (6).

6. The high-efficiency centrifugal wind wheel according to claim 1, characterized in that: A balancing sheet (7) is provided at the air inlet (4) and / or the air outlet (5).

7. A fan, characterized in that: It comprises a motor (8) and a high-efficiency centrifugal wind wheel as claimed in any one of claims 1 to 6, wherein a labyrinth connection structure (9) is formed between the rotor housing of the motor (8) and the wheel cover (2) of the high-efficiency centrifugal wind wheel.

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