Low noise impeller

Abstract

The utility model discloses a low noise impeller, including impeller upper portion and impeller lower portion, the impeller upper portion includes annular air inlet ring, sets up in the air inlet ring one side's a plurality of blades, and sets up in the blade lower end portion's mounting plate, the impeller lower portion is annular, the mounting plate sets up in the inside of the impeller lower portion, and the mounting plate is used to fix motor, the air inlet ring with the impeller lower portion is opposite and sets up, and the upper end portion of blade is connected the air inlet ring, and the lower end portion of blade is connected the mounting plate with the impeller lower portion. Compared with prior art, the low noise impeller of the utility model guarantees the pneumatic performance, reduces the noise level significantly, improves the consistency and reliability of product.

Description

Technical Field

[0001] This utility model relates to the field of rotating component technology in the wind turbine industry, and in particular to a low-noise impeller. Background Technology

[0002] Currently, most household appliances, such as air purifiers, sterilizers, humidifiers, and range hoods, widely use fan impellers as their core rotating components. These devices have high requirements for noise control, but existing impeller designs generally suffer from periodic airflow fluctuation noise. With consumers' increasing demand for quiet operation, reducing impeller noise has become a key technological challenge for the industry. In recent years, domestic and international scholars have mainly attempted to reduce noise by improving blade shape, optimizing material selection, and adding vibration-damping structures; however, many technical bottlenecks still exist in practical applications.

[0003] First, the blades of traditional impellers are typically evenly distributed, generating periodic airflow fluctuations during rotation, leading to increased noise. These periodic airflow fluctuations create noise at specific frequencies, affecting not only the comfort of the user environment but also potentially causing resonance, further exacerbating the noise problem. Second, the vibrations generated by the impeller during high-speed rotation are easily transmitted to the entire machine structure, causing resonance and generating additional noise. Current technologies lack effective isolation measures for this vibration transmission problem. Furthermore, existing impellers suffer from deficiencies in assembly precision and batch production consistency, resulting in inconsistent noise and performance across different batches of machines, making it difficult to guarantee product quality stability.

[0004] Therefore, there is an urgent need for a structurally optimized low-noise impeller that can effectively reduce the periodic noise generated during impeller rotation, isolate vibration transmission, and improve assembly accuracy and consistency in mass production, thereby enhancing the overall performance and user experience. Summary of the Invention

[0005] The purpose of this invention is to provide a low-noise impeller to solve the problems existing in the background technology, aiming to eliminate the periodic airflow fluctuation noise generated when the impeller rotates, block the transmission of motor vibration to the whole machine, and improve the consistency and stability of impeller assembly.

[0006] A low-noise impeller includes an upper impeller portion and a lower impeller portion. The upper impeller portion includes an annular air inlet ring, a plurality of blades disposed on one side of the air inlet ring, and a mounting plate disposed at the lower end of the blades. The lower impeller portion is annular, and the mounting plate is disposed on the inner side of the lower impeller portion for fixing a motor. The air inlet ring and the lower impeller portion are disposed opposite to each other. The upper end of the blades is connected to the air inlet ring, and the lower end of the blades is connected to the mounting plate and the lower impeller portion.

[0007] Preferably, the number of blades is odd, and the blades are not evenly distributed, so that the blades do not generate periodic airflow fluctuations during rotation, effectively reducing noise.

[0008] Preferably, the projection of the blade onto the plane parallel to the air inlet ring forms several intersection points with the outer circle of the air inlet ring, and the central angle α formed between any two adjacent intersection points is not equal.

[0009] Preferably, the projection of the blade onto the plane parallel to the air inlet ring forms several intersection points with the outer circle of the mounting plate, and the central angle β formed between any two adjacent intersection points is not equal.

[0010] Preferably, the blades are streamlined arc-shaped, and the thickness of the blades gradually increases and then gradually decreases along the air outlet direction, and the thickness of the front end of the blades is greater than the thickness of the tail end of the blades. This design improves the aerodynamic efficiency of the impeller.

[0011] Preferably, the inner diameter of the air inlet ring is equal to the inner diameter of the lower part of the impeller, the upper end of the portion of the blade exceeding 2 / 3 of its length is connected to the air inlet ring, and the upper end of the remaining length portion extends into the inner side of the air inlet ring.

[0012] Preferably, the outer diameter of the air inlet ring is equal to the outer diameter of the lower part of the impeller, the lower end of the blade exceeding 2 / 3 of its length is connected to the lower part of the impeller, and the lower end of the remaining length is connected to the mounting plate.

[0013] Preferably, a boss is provided at the lower end of the blade, and a groove adapted to the boss is provided at the lower part of the impeller. The height of the boss is 0.5-2mm. The boss and the groove are connected by ultrasonic welding, which improves the assembly accuracy of the impeller and the consistency of mass production.

[0014] Preferably, the groove is provided with staggered conical protrusions, the height of which is less than the depth of the groove. When the protrusions and the groove are ultrasonically welded, the small protrusions concentrate energy, melting the plastic and firmly connecting the upper and lower parts of the impeller together, ensuring the long-term stability of the impeller.

[0015] Preferably, the mounting plate has a circular mounting hole at its center, and a motor mounting sleeve is fixed in the mounting hole. The motor mounting sleeve includes an impeller sleeve and a motor shaft sleeve fitted inside the impeller sleeve. A shock-absorbing sleeve is also provided between the impeller sleeve and the motor shaft sleeve to absorb impeller vibration and reduce vibration noise.

[0016] Preferably, the impeller sleeve and the motor shaft sleeve are made of metal, and the shock-absorbing sleeve is made of rubber. The three-layer structure design significantly reduces vibration transmission.

[0017] Preferably, the inner wall of the mounting hole is provided with a radially protruding locking platform, and the outer periphery of the impeller sleeve is provided with a locking groove adapted to the locking platform. The locking groove and the locking platform are tightly engaged to prevent loosening and improve the reliability of the impeller in use.

[0018] Preferably, the upper part of the impeller and the motor mounting sleeve are integrally injection molded, and the lower part of the impeller is integrally injection molded.

[0019] Compared with existing technologies, the technical advantages of this solution are as follows:

[0020] (1) The blade design with non-uniform angular distribution effectively eliminates the periodic airflow fluctuation noise of the impeller;

[0021] (2) The three-layer motor mounting sleeve design significantly reduces vibration transmission and reduces overall noise by more than 30%;

[0022] (3) The precise positioning design between the boss at the lower end of the blade and the groove at the lower part of the impeller ensures product consistency, with performance differences between batches being less than 5%;

[0023] (4) The blade design, which combines streamlined arc shape with gradual thickness, improves the aerodynamic efficiency of the impeller, increasing air volume by 15% while reducing noise by 20%.

[0024] The beneficial effects that other technical solutions in this utility model can achieve compared with the prior art are described in detail in the specific embodiments. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the low-noise impeller of this utility model;

[0027] Figure 2 This is a cross-sectional view of the overall low-noise impeller of this utility model;

[0028] Figure 3 This is a schematic diagram of the projection of the blade of this utility model onto the plane where the air inlet ring is located (I);

[0029] Figure 4This is a schematic diagram (II) showing the projection of the blade of this utility model onto the plane where the air inlet ring is located;

[0030] Figure 5 This is a schematic diagram of the upper part of the impeller of this utility model;

[0031] Figure 6 This is an enlarged structural schematic diagram of the lower end of the blade of this utility model;

[0032] Figure 7 This is an enlarged structural diagram of the lower part of the impeller of this utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the motor mounting sleeve of this utility model.

[0034] in:

[0035] 1-Upper part of impeller; 11-Air inlet ring; 12-Blade; 121-Upper end; 122-Lower end; 1221-Boss; 13-Mounting plate; 131-Mounting hole; 1311-Clamping platform;

[0036] 2-Lower part of impeller; 21-Groove; 211-Small boss;

[0037] 3-Motor mounting sleeve; 31-Impeller sleeve; 311-Slot; 32-Motor shaft sleeve; 33-Shock-absorbing sleeve. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] like Figures 1-2 As shown, a low-noise impeller includes an upper impeller 1 and a lower impeller 2. The upper impeller 1 includes an annular air inlet ring 11, a plurality of blades 12 disposed on one side of the air inlet ring 11, and a mounting plate 13 disposed on the lower end 122 of the blades 12. The lower impeller 2 is annular, and the mounting plate 13 is disposed on the inner side of the lower impeller 2 for fixing a motor. The air inlet ring 11 and the lower impeller 2 are disposed opposite to each other. The upper end 121 of the blades 12 is connected to the air inlet ring 11, and the lower end 122 of the blades 12 is connected to the mounting plate 13 and the lower impeller 2.

[0040] Please refer to Figure 2 , Figure 2The middle arrow indicates the airflow direction. In this embodiment, the air inlet ring 11 is the air inlet of the impeller, and the airflow channel formed between adjacent blades 12 is the air outlet of the impeller. The upper part 1 and the lower part 2 of the impeller are integrally formed. The upper part 1 and the lower part 2 of the impeller are connected by ultrasonic welding, which makes the impeller have good overall stability.

[0041] Further, please refer to Figure 2 The air inlet ring 11 has two mutually perpendicular sides, one of which is parallel to the air inlet direction and the other is parallel to the air outlet direction. The two sides are smoothly connected, giving the air inlet ring 11 an overall annular arc surface, which guides and reduces noise of the air entering the impeller. The mounting plate 13 and the lower part 2 of the impeller both bulge towards the air inlet. After the upper part 1 and the lower part 2 of the impeller are ultrasonically welded together, the leeward side of the impeller forms a convex arc surface, which reduces the volume of the airflow channel inside the impeller, allowing the airflow to be quickly discharged from the impeller and improving the working efficiency of the impeller.

[0042] In a preferred embodiment, the number of blades 12 is odd, and the blades 12 are not evenly spaced, so that the blades 12 do not generate periodic airflow fluctuations during rotation, effectively reducing noise. Specifically, the number of blades 12 is usually 7, 9, 11, or 13, and 11 is preferred in this embodiment. The uneven distribution of the blades 12 means that the distance between any two adjacent blades 12 is not equal, thereby minimizing airflow fluctuations and reducing noise to the greatest extent.

[0043] In a preferred embodiment, the projection of the blade 12 onto the plane parallel to the air inlet ring 11 forms several intersection points with the outer circle of the air inlet ring 11, and the central angle α formed between any two adjacent intersection points is not equal. Specifically, please refer to... Figure 3 The projection of the air inlet ring 11 onto the plane parallel to the air inlet ring 11 is circular. The projections of each blade 12 intersect with the circular projection of the air inlet ring 11, forming several intersection points. The angle between the radii of two adjacent intersection points connected to the center O of the circle is the central angle α. Any central angle α... i (The value of i is equal to the number of leaves 12) They are all different. That is, when there are 11 leaves 12, there are 11 central angles α, namely α1, α2, α3, α4, α5, α6, α7, α8, α9, α 10 α 11 Where α1≠α2≠α3≠α4≠α5≠α6≠α7≠α8≠α9≠α 10 ≠α 11 .

[0044] In a preferred embodiment, the projection of the blade 12 onto the plane parallel to the inlet ring 11 forms several intersection points with the outer circle of the mounting plate 13, and the central angle β formed between any two adjacent intersection points is unequal. Specifically, please refer to... Figure 4 The projection of the mounting plate 13 onto the plane parallel to the air inlet ring 11 is circular. The projections of each blade 12 intersect with the circular projection of the mounting plate 13, forming several intersection points. The angle between the radii of two adjacent intersection points connected to the center O of the circle is the central angle β. Any central angle β... i (The value of i is equal to the number of leaves 12) They are all different. That is, when there are 11 leaves 12, there are 11 central angles β, namely β1, β2, β3, β4, β5, β6, β7, β8, β9, β 10 ,β 11 Where β1≠β2≠β3≠β4≠β5≠β6≠β7≠β8≠β9≠β 10 ≠β 11 For example, in this embodiment, 11 blades 12 are used, and the corresponding central angle β values ​​are 31°, 26°, 32°, 35°, 37°, 30°, 28°, 33°, 34°, 36°, and 38°.

[0045] In a preferred embodiment, the blade 12 is streamlined and arc-shaped, and the thickness of the blade 12 gradually increases and then gradually decreases along the air outlet direction, with the thickness of the leading edge of the blade 12 being greater than the thickness of the trailing edge. For details, please refer to... Figure 5 The end of blade 12 connected to the inlet ring 11 is the upper end 121, and the end of blade 12 connected to the mounting plate 13 is the lower end 122. The end of blade 12 closer to the impeller center is the front end, and the end of blade 12 farther from the impeller center is the tail end. For example, in this embodiment, the thickness of the front end of blade 12 is 1.5mm, the thickness is greatest at a position 0.4 times the length from the front end to the rear end, which is 4.1mm, and the thickness of the tail end of blade 12 is 1.4mm. This design combines streamlined arc shape with gradual thickness change, further optimizing airflow guidance and velocity distribution, reducing blade 12 resistance, reducing impeller vortex noise, and improving impeller efficiency.

[0046] In a preferred embodiment, the inner diameter of the inlet ring 11 is equal to the inner diameter of the lower impeller 2. The upper end 121 of the blade 12, exceeding two-thirds of its length, is connected to the inlet ring 11, while the upper end 121 of the remaining length extends into the inner side of the inlet ring 11. In this embodiment, the blade 12 length refers to the length of the blade 12 extending in a direction parallel to the airflow direction; the upper end 121 of the blade 12, exceeding two-thirds of its length from the tail end to the front end, is connected to the inlet ring 11, while the upper end 121 of the remaining length extends into the inner side of the inlet ring 11, which refers to the side closest to the impeller center. This design is beneficial for improving the impeller's aerodynamic efficiency.

[0047] In a preferred embodiment, the outer diameter of the inlet ring 11 is equal to the outer diameter of the lower impeller 2. The lower end 122 of the blade 12, exceeding two-thirds of its length, is connected to the lower impeller 2, while the lower end 122 of the remaining length is connected to the mounting plate 13. In this embodiment, the blade 12 length refers to the length of the blade 12 extending in a direction parallel to the airflow direction; the lower end 122 of the blade 12, exceeding two-thirds of its length from the tail end to the front end, is connected to the lower impeller 2, while the lower end 122 of the remaining length is connected to the mounting plate 13. This design further improves the aerodynamic efficiency of the impeller.

[0048] In a preferred embodiment, please refer to Figure 6 The lower end 122 of the blade 12 is provided with a boss 1221, and the lower part 2 of the impeller is provided with a groove 21 that matches the boss 1221. The height of the boss 1221 is 0.5-2mm. In this embodiment, the boss 1221 and the groove 21 are connected by ultrasonic welding, which improves the assembly accuracy of the impeller and the consistency of mass production.

[0049] Further, please refer to Figure 7 The lower part 2 of the impeller has staggered conical protrusions 211 arranged in the groove 21. The height of the protrusions 211 is less than the depth of the groove 21. When the protrusions 1221 and the groove 21 are ultrasonically welded, the small protrusions 211 concentrate energy and melt the plastic, so that the upper part 1 and the lower part 2 of the impeller are firmly connected together, ensuring the stability of the impeller in long-term operation.

[0050] In a preferred embodiment, please refer to Figure 8 The mounting plate 13 has a circular mounting hole 131 at its center, and a motor mounting sleeve 3 is fixed inside the mounting hole 131. The motor mounting sleeve 3 includes an impeller sleeve 31 and a motor shaft sleeve 32 fitted inside the impeller sleeve 31. A shock-absorbing sleeve 33 is also provided between the impeller sleeve 31 and the motor shaft sleeve 32 to absorb impeller vibration and reduce vibration noise. Preferably, the motor shaft sleeve 32 and the impeller sleeve 31 are made of metal, and the shock-absorbing sleeve 33 is made of rubber. The three-layer structure design significantly reduces vibration transmission.

[0051] In a preferred embodiment, a radially protruding mounting plate 1311 is provided on the inner sidewall of the mounting hole 131, and a mounting groove 311 adapted to the mounting plate 1311 is provided on the outer periphery of the impeller sleeve 31. The mounting groove 311 and the mounting plate 1311 are tightly engaged to prevent loosening and improve the reliability of the impeller.

[0052] Preferably, the upper part 1 of the impeller and the motor mounting sleeve 3 are integrally injection molded, and the lower part 2 of the impeller is integrally injection molded.

[0053] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0054] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A low-noise impeller, characterized in that, The impeller comprises an upper part (1) and a lower part (2). The upper part (1) includes an annular inlet ring (11), a plurality of blades (12) disposed on one side of the inlet ring (11), and a mounting plate (13) disposed at the lower end (122) of the blades (12). The lower part (2) is annular, and the mounting plate (13) is disposed inside the lower part (2) of the impeller. The mounting plate (13) is used to fix the motor. The inlet ring (11) and the impeller The lower part (2) is arranged opposite to each other. The upper end (121) of the blade (12) is connected to the air inlet ring (11), and the lower end (122) of the blade (12) is connected to the mounting plate (13) and the lower part (2) of the impeller. The lower end (122) of the blade (12) is provided with a boss (1221), and the lower part (2) of the impeller is provided with a groove (21) that matches the boss (1221). The height of the boss (1221) is 0.5-2mm.

2. The low-noise impeller according to claim 1, characterized in that, The number of blades (12) is odd, and the blades (12) are not evenly distributed.

3. The low-noise impeller according to claim 2, characterized in that, The projection of the blade (12) on the plane parallel to the air inlet ring (11) forms several intersection points with the outer circle of the air inlet ring (11), and the central angle α formed between any two adjacent intersection points is not equal.

4. The low-noise impeller according to claim 2 or 3, characterized in that, The projection of the blade (12) on the plane parallel to the air inlet ring (11) forms several intersection points with the outer circle of the mounting plate (13), and the central angle β formed between any two adjacent intersection points is not equal.

5. The low-noise impeller according to claim 1, characterized in that, The blade (12) is streamlined and arc-shaped. The thickness of the blade (12) gradually increases and then gradually decreases along the air outlet direction. The thickness of the front end of the blade (12) is greater than the thickness of the tail end of the blade (12).

6. The low-noise impeller according to claim 1, characterized in that, The inner diameter of the air inlet ring (11) is equal to the inner diameter of the lower part (2) of the impeller. The upper end (121) of the blade (12) exceeding 2 / 3 of its length is connected to the air inlet ring (11), and the upper end (121) of the remaining length extends into the inside of the air inlet ring (11).

7. The low-noise impeller according to claim 1, characterized in that, The outer diameter of the air inlet ring (11) is equal to the outer diameter of the lower part of the impeller (2). The lower end (122) of the blade (12) exceeding 2 / 3 of its length is connected to the lower part of the impeller (2), and the lower end (122) of the remaining length is connected to the mounting plate (13).

8. The low-noise impeller according to claim 1, characterized in that, The mounting plate (13) has a circular mounting hole (131) in the center. The mounting hole (131) is fixed with a motor mounting sleeve (3). The motor mounting sleeve (3) includes an impeller sleeve (31) and a motor shaft sleeve (32) sleeved inside the impeller sleeve (31). A shock-absorbing sleeve (33) is also provided between the impeller sleeve (31) and the motor shaft sleeve (32).

9. The low-noise impeller according to claim 8, characterized in that, The inner wall of the mounting hole (131) is provided with a radially protruding locking platform (1311), and the outer periphery of the impeller sleeve (31) is provided with a locking groove (311) that is adapted to the locking platform (1311).

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