Low-noise impeller based on blade combination

Abstract

A low-noise impeller based on blade combination belongs to the technical field of machinery and comprises a hub, a front disc and blades, a plurality of blades of different blade types are circumferentially distributed between the hub and the front disc, and the blades are circumferentially and uniformly distributed. Blades with different blade molded lines are combined and arranged in the circumferential direction of an impeller, so that the airflow impact period is influenced when the impeller rotates, the intensity of airflow periodic impact is weakened, the impact noise of airflow is reduced, and the purpose of reducing the aerodynamic noise of the centrifugal fan is achieved.

Description

Technical Field

[0001] This utility model relates to a low-noise impeller based on blade assembly, belonging to the field of mechanical technology. Background Technology

[0002] With the rapid development of modern industry, centrifugal fans, as a type of general-purpose machinery, have the advantages of compact structure, low noise, and high flow and pressure coefficients. They can perform functions such as dust removal, heat dissipation, and ventilation, and are widely used in kitchen appliances for exhausting fumes, air conditioning indoor units for air supply, building ventilation and dust removal, and ventilation and induced draft in factories and boilers. As people's living standards improve, noise issues are receiving increasing attention, and people's requirements for the noise performance of centrifugal fans are also gradually increasing.

[0003] Centrifugal fans have a relatively simple structure, mainly consisting of components such as a volute and impeller. During operation, the noise sources are primarily aerodynamic noise, mechanical noise, and electromagnetic noise. The impeller is the only rotating component in a centrifugal fan. As the rotational speed gradually increases, the vortices generated by the rotating blades are the main source of noise, producing relatively high aerodynamic noise. Utility Model Content

[0004] The technical problem solved by this utility model is to overcome the shortcomings of the prior art and provide a low-noise impeller based on blade combination. By arranging blades with different blade profiles in the circumferential combination of the impeller, the aerodynamic noise of the centrifugal fan is reduced with minimal loss of aerodynamic performance.

[0005] The technical solution of this utility model is: a low-noise impeller based on blade assembly, comprising:

[0006] The hub has a through hole in the center for fixing and mounting the impeller;

[0007] The front disc is arranged coaxially with the wheel hub;

[0008] Multiple blades are evenly distributed circumferentially between the hub and the front disc; the multiple blades are divided into different blade types according to the radial length of the impeller profile, all blades have the same inlet angle, blades of the same blade type have the same outlet angle, and blades of different blade types have different outlet angles.

[0009] Furthermore, the plurality of blades includes a plurality of blade combinations; each blade combination includes a main blade and a plurality of secondary blades; the radial length of the impeller profile of the main blade is greater than that of the secondary blades.

[0010] Furthermore, the range of values ​​for the number of blade combinations m is 4 ≤ m ≤ 12.

[0011] Furthermore, the number m of the blade combinations is an even number, and each blade combination has the same number of blades.

[0012] Furthermore, the range of the number of blades k in each blade combination is 2≤k≤6.

[0013] Furthermore, the total number of blades n is an even number, and n≥12.

[0014] Furthermore, each blade assembly occupies the same angle in the circumferential direction.

[0015] Furthermore, the lengths of the secondary blades in each blade assembly are not the same.

[0016] Furthermore, the primary blades and secondary blades in each blade assembly are arranged sequentially along the circumferential direction according to their radial length.

[0017] Furthermore, the radial length a of the blade profile of the main blade and the radial length b of the blade profile of the secondary blade satisfy a / 2 ≤ b < a.

[0018] The advantages of this utility model compared with the prior art are as follows:

[0019] This invention relates to a low-noise impeller based on blade assembly, which can be used in centrifugal fans. By arranging blades with different blade profiles in the circumferential arrangement of the impeller, the periodic impact of the outlet airflow during impeller rotation is affected, the intensity of the periodic impact of the outlet airflow is weakened, and the impact noise of the airflow is reduced, thereby achieving the purpose of reducing the aerodynamic noise of the centrifugal fan. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 This is a schematic diagram of the low-noise impeller described in this utility model;

[0022] Figure 2 This is a schematic diagram of the blade distribution of the low-noise impeller described in this utility model.

[0023] Explanation of reference numerals in the attached diagram: 1-hub; 2-main blade; 3-secondary blade; 4-front disc. Detailed Implementation

[0024] To better understand the above technical solutions, the technical solutions of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this utility model and the specific features in the embodiments are detailed descriptions of the technical solutions of this utility model, rather than limitations on the technical solutions of this utility model. In the absence of conflict, the embodiments of this utility model and the technical features in the embodiments can be combined with each other.

[0025] The following description, in conjunction with the accompanying drawings, provides a detailed account of a low-noise impeller based on a blade assembly, according to an embodiment of this utility model. The specific implementation may include: a hub with a central through-hole for fixing and mounting the impeller; a front disc coaxially arranged with the hub; and multiple blades evenly distributed circumferentially between the hub and the front disc. The multiple blades are classified into different blade types based on the radial length of the impeller profile. All blades have the same inlet angle, blades of the same blade type have the same outlet angle, and blades of different blade types have different outlet angles. The multiple blades include multiple blade assemblies; each blade assembly includes one main blade and multiple auxiliary blades; the radial length of the impeller profile of the main blade is greater than that of the auxiliary blades.

[0026] In the solutions provided by the embodiments of this utility model, such as Figure 1 As shown, this utility model is a low-noise impeller based on blade assembly, mainly used in centrifugal fans to reduce fan rotation noise. The impeller includes a hub 1, main blades 2, auxiliary blades 3, and a front plate 4. Multiple main blades 2 and auxiliary blades 3 are evenly distributed circumferentially between the hub 1 and the front plate 4.

[0027] The multiple blades distributed circumferentially are distinguished by their blade profiles. The blade with the longest radial length is the main blade 2, and the rest are secondary blades 3.

[0028] Multiple circumferentially distributed main blades 2 and secondary blades 3 are divided into multiple blade combinations, and each group of blades occupies the same angle in the circumferential direction. The blade combinations are divided as follows: the circumferentially distributed blades are sequentially divided into various blade combinations, and each blade combination consists of one main blade 2 and multiple secondary blades 3. In each blade combination, the main blades 2 and secondary blades 3 are arranged sequentially along the circumferential direction according to their radial length, as follows: Figure 2 As shown.

[0029] Rotational noise in centrifugal fans is generated by the periodic impact of the airflow at the blade outlet on the volute tongue. In conventional impellers, the blades are symmetrically and uniformly distributed along the circumference, and the inlet / outlet angles of the blades are the same. Therefore, when the impeller rotates, the impact intensity and phase difference of the airflow at the outlet of adjacent blades are the same, which leads to the superposition of this impact noise, thus increasing the rotational noise of the centrifugal fan.

[0030] In this invention, by combining and arranging a main blade 2 and multiple auxiliary blades 3, the circumferential distribution symmetry of the impeller blades is changed, thereby altering the impact period of the airflow at the blade outlet on the flow channel, and thus reducing the rotational noise generated when the impeller rotates.

[0031] In circumferentially distributed blades, the inlet angle is the same for all blades. Blades of the same leaf type have the same outlet angle, while blades of different leaf types have different outlet angles.

[0032] The blades are divided into multiple blade combinations in such a way that each group of blades consists of one main blade 2 and multiple secondary blades 3. The number of blade combinations m is not less than 4 and the value range is 4≤m≤12.

[0033] Specifically, the number of blade combinations is even to avoid the blade grouping arrangement affecting the dynamic balance of the impeller. Each blade combination contains the same number of blades, with the number of blades ranging from 2 to k and from 6 to 2.

[0034] Furthermore, the total number of blades n in the impeller is even, and n≥12.

[0035] In the impeller blade assembly, the radial length of the blade profile of the main blade 2 is 'a', and the radial length of the blade profile of the secondary blade 3 is in the range of a / 2 ≤ b < a. This avoids unstable airflow caused by a large difference in radial length between the secondary blade 3 and the main blade 2, which could lead to impeller vibration and additional vibration noise.

[0036] In this application, because the radial lengths and outlet angles of the main blades 2 and auxiliary blades 3 with different blade shapes are different, the outlet positions and directions of the airflow of different blades in the same blade assembly are different, and the impact intensity of the airflow between different blades is different. Therefore, the impact noise frequencies generated by the outlet airflow of adjacent blades are different. So when the impeller rotates, the noise generated by each blade in the blade assembly cannot be superimposed, thereby reducing the noise of the centrifugal fan.

[0037] In summary, this invention relates to a low-noise impeller based on blade assembly. To reduce the aerodynamic noise of a centrifugal fan, the impeller blades are arranged in a circumferentially distributed manner with different blade shapes, reducing the periodic impact of the airflow at the blade outlet during impeller rotation. The circumferentially distributed blades are divided into multiple blade assemblies, each consisting of one main blade 2 and multiple auxiliary blades 3. The number of blade assemblies m is an even number and not less than 4, with a value range of 4 ≤ m ≤ 12. The number of blades within each blade assembly is the same as the circumferentially distributed arrangement. This impeller exhibits good dynamic balance, reducing the aerodynamic noise of the centrifugal fan with minimal aerodynamic performance loss.

[0038] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications.

[0039] Including variations.

[0040] The contents not described in detail in this utility model specification are common knowledge to those skilled in the art.

Claims

1. A low-noise impeller based on blade assembly, characterized in that, include: The hub has a through hole in the center for fixing and mounting the impeller; The front disc is arranged coaxially with the wheel hub; Multiple blades are evenly distributed circumferentially between the hub and the front disc; the multiple blades are divided into different blade types according to the radial length of the impeller profile, all blades have the same inlet angle, blades of the same blade type have the same outlet angle, and blades of different blade types have different outlet angles.

2. The low-noise impeller based on blade assembly according to claim 1, characterized in that, The plurality of blades includes a plurality of blade combinations; each blade combination includes a main blade and a plurality of secondary blades; the radial length of the impeller profile of the main blade is greater than that of the secondary blades.

3. A low-noise impeller based on blade assembly according to claim 2, characterized in that, The range of values ​​for the number of blade combinations m is 4 ≤ m ≤ 12.

4. A low-noise impeller based on blade assembly according to claim 2, characterized in that, The number m of the blade combinations is an even number, and the number of blades in each blade combination is the same.

5. A low-noise impeller based on blade assembly according to claim 4, characterized in that, The number of leaves k in each leaf combination is in the range of 2≤k≤6.

6. A low-noise impeller based on blade assembly according to claim 2, characterized in that, The total number of leaves, n, is an even number, and n ≥ 12.

7. A low-noise impeller based on blade assembly according to claim 2, characterized in that, Each blade assembly occupies the same angle in the circumferential direction.

8. A low-noise impeller based on blade assembly according to claim 2, characterized in that, The lengths of the secondary blades in each blade assembly are not the same.

9. A low-noise impeller based on blade assembly according to claim 8, characterized in that, In each blade assembly, the primary and secondary blades are arranged sequentially along the circumference according to their radial length.

10. A low-noise impeller based on blade assembly according to claim 1, characterized in that, The radial length a of the blade profile of the main blade and the radial length b of the blade profile of the secondary blade satisfy a / 2 ≤ b < a.

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