Fan and motor using same

Abstract

The utility model relates to a fan and a motor applying the same, which solve the problem of loud noise when the fan works in the prior art, and adopt the technical scheme that the fan comprises a housing and an impeller arranged in the housing, and is characterized in that the impeller comprises a chassis and a plurality of blades which are arranged on the front surface of the chassis and are distributed in a central symmetry manner; the cover shell and the base plate are arranged in a deviating mode, an air inlet is formed in the end, deviating from the base plate, of the cover shell, an air outlet is formed between the cover shell and the periphery of the impeller, the blades are of a space structure, and a noise reduction airflow circulation space is formed by the top faces of the blades and the inner wall of the cover shell. The fan has the advantages that the impeller structure in the fan is improved, a noise reduction airflow circulation space is formed between the impeller and the housing, and the purpose of noise reduction is achieved.

Description

Technical Field

[0001] This utility model relates to the field of fans and motors, and in particular to a fan with noise reduction effect and a motor using the same. Background Technology

[0002] As people's pursuit of quality of life increases, the noise problem of household appliances is receiving more and more attention. The main sources of noise in household water pumps are the pump body and the cooling fan. At present, there is more research and optimization on the pump body, but less on the cooling fan. Existing pump cooling fans are mainly flat plate structures, which generate considerable noise during operation. Therefore, the technical solution involved in this utility model mainly focuses on improving and optimizing pump cooling fans. Summary of the Invention

[0003] The purpose of this utility model is to solve the above-mentioned problems existing in the prior art by providing a fan and a motor using the same, improving the impeller structure in the fan, so that a noise-reducing airflow space is formed between the impeller and the casing, thereby achieving the purpose of noise reduction.

[0004] The above-mentioned technical objectives of this utility model are mainly achieved through the following technical solutions:

[0005] The technical solution of the first technical subject matter involved in this utility model is as follows:

[0006] A fan includes a housing and an impeller disposed within the housing. The impeller comprises a chassis and a plurality of blades symmetrically distributed on the front surface of the chassis. The housing is disposed opposite to the chassis, with an air inlet at one end of the housing opposite to the chassis. An air outlet is located between the housing and the periphery of the impeller. The blades have a spatial structure, and the top surface of the blades forms a noise-reducing airflow space with the inner wall of the housing. Improving the impeller structure in the fan creates a noise-reducing airflow space between the impeller and the housing, achieving noise reduction. Specifically, it at least changes the regular flat blade structure of the existing technology to a spatial blade structure, creating a noise-reducing airflow space between the top surface of the blades and the inner wall of the housing. This allows for a more uniform distribution of airflow from the air inlet to the air outlet, reducing eddies formed between the impeller and the housing, thereby reducing noise.

[0007] As a further improvement and supplement to the above technical solution, this utility model adopts the following technical measures: the top surface of the blade includes an air inlet surface, an air outlet surface, and a guide surface disposed between the air inlet surface and the air outlet surface. Both the air inlet surface and the air outlet surface are inclined surfaces. The air inlet surface is inclined towards the air inlet direction, and the air outlet surface is inclined towards the air outlet direction. The guide surface is an arc-shaped surface convex towards the cover. Specific definition of the blade top surface helps to ensure that the blade top surface conforms to the airflow direction, efficiently drawing air from outside the fan through the air inlet into the fan and then blowing it out from the air outlet, while also reducing the possibility of airflow turbulence, thereby contributing to noise reduction.

[0008] Preferably, the bottom surface of the blades is parallel to the guide surface, and the blades are perpendicular to the chassis. Both sides of each blade are curved towards the circumference of the chassis. The parallel alignment of the blade bottom surface with the guide surface helps to further reduce airflow turbulence and noise. The perpendicular alignment of the blades to the chassis facilitates easier demolding during impeller fabrication. The circumferential curvature of the blades increases the intake and exhaust airflow, thereby improving the fan's efficiency.

[0009] Preferably, the diameters of the impeller's inlet and outlet are d1 and d2, respectively, where d1:d2 = 0.3 to 0.8. This ratio of inlet to outlet diameter promotes more balanced airflow within the fan, reduces noise, ensures adequate intake and exhaust volume, and improves fan efficiency.

[0010] Preferably, the ratio of the distance H between the bottom surface of the blade and the guide surface on the blade to the diameter d2 at the outlet of the impeller is: H:d2 = 1 / 4 to 3 / 4. The distance H ensures sufficient airflow efficiency, thereby ensuring the overall blowing efficiency of the fan. The ratio between distance H and diameter d2 helps to ensure a match between airflow efficiency and outlet efficiency, preventing airflow from stagnating or swirling within the fan and generating eddies, thus preventing noise from eddies and ensuring low fan operating noise.

[0011] Preferably, the angle between the bottom surface of the blade and the air inlet surface of the blade is D, where 75°≤D≤105°. The blade and the chassis are an integral structure, with the bottom surface of the blade being part of the chassis, i.e., the junction between the blade and the chassis. This angular relationship between the bottom surface of the blade and the air inlet surface facilitates the efficient entry and exit of external air into the fan, while also ensuring smooth airflow within the fan, thus reducing fan operating noise.

[0012] Preferably, the rear surface of the chassis is a flat surface perpendicular to the axis of the impeller. The front surface of the chassis is a wind guiding surface that gradually protrudes towards the air inlet direction from the outer edge to the inner edge. The angle between the front surface and the rear surface is C, where 30° ≤ C ≤ 60°. The shape of the front surface of the chassis is conducive to sucking air from the air inlet, guiding the air flow to flow smoothly to the air outlet, and then discharging the air smoothly through the air outlet, reducing the generation of eddy currents in the air flow, thereby helping to reduce the noise generated by the eddy currents and further reducing the working noise of the fan.

[0013] Preferably, the housing includes a cylindrical part and a wind guiding part disposed in the inner cavity of the cylindrical part. The wind guiding part includes a cylindrical air inlet part and a flared horn part with two ends respectively connected to the cylindrical part and the cylindrical air inlet part. The inclination angle E of the flared horn part is adapted to the inclination angle of the front surface of the chassis. The inner diameter H1 of the cylindrical air inlet part is smaller than the diameter d2 at the air outlet of the impeller. Among them, the inclination angle E of the flared horn part is adapted to the inclination angle of the front surface of the chassis, that is, the value of the inclination angle E is adapted to the value of the angle C between the front surface and the rear surface. The difference between the inclination angle E and the angle C is ±30°. H1 < d2 is conducive to ensuring that the noise reduction air flow circulation space inside the fan can reduce eddy currents and achieve the purpose of noise reduction. The inner diameter H2 of the outlet of the wind guiding part is matched with the outer shell size of the motor.

[0014] Preferably, the angle between the air inlet end of the blade and the tangent line at its corresponding position is the air inlet angle B, where 60° ≤ B ≤ 90°. Limiting the air inlet angle is conducive to reducing the impact sound generated by the collision between the air flow and the corresponding part of the fan during air inlet, and also conducive to reducing the noise generated by the eddy currents in the air flow, thereby ensuring a low working noise of the fan.

[0015] Preferably, the angle between the air outlet end of the blade and the tangent line at its corresponding position is the air outlet angle A, where 45° ≤ A ≤ 75°. Limiting the air outlet angle is conducive to reducing the resistance and enabling the air flow inside the fan to flow outwards quickly along the trend, reducing the collision between the air flow and the corresponding part of the fan during air outlet and the impact sound generated, and also conducive to reducing the noise generated by the eddy currents in the air flow, thereby ensuring a low working noise of the fan.

[0016] The technical solution of the second technical subject of this utility model is as follows: an electric motor, including a motor body and a fan detachably fixed to the rotating shaft of the motor body. The fan is the aforementioned type of fan, with a shaft hole in the middle of the impeller. The rotating shaft passes through the shaft hole and forms a detachable fixed fit with the impeller. The air outlet of the fan is along the axial direction of the motor body and faces the motor body. Corresponding to the air outlet, the inner diameter of the cover is larger than the outer diameter of the motor body. The use of a noise-reducing fan on the motor results in low noise during operation, which in turn helps reduce the operating noise of household appliances (such as household water pumps) using this motor, ensuring a low-noise environment and providing a more comfortable living, learning, and working environment for people.

[0017] The beneficial effects of this utility model are as follows: 1. It improves the impeller structure in the fan, creating a noise-reducing airflow space between the impeller and the casing, thus achieving noise reduction. 2. The blades are spatially structured, creating a noise-reducing airflow space between the top surface of the blade and the inner wall of the casing. This allows for a more uniform distribution of airflow from the inlet to the outlet, reducing eddies between the impeller and the casing, thereby reducing noise. 3. Specific definitions are made for the top surface of the blades and the front surface of the chassis, forming a defined noise-reducing airflow space to reduce noise generated when airflow flows inside the fan. 4. The angle between the bottom surface of the blades and the inlet surface of the blades, as well as the definition of the inlet and inlet angle, reduce noise generated during air intake. 5. Definitions are made for the outlet and outlet angle of the impeller, which helps reduce noise generated during air exhaust. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a fan that relates to this utility model.

[0019] Figure 2 yes Figure 1 A schematic diagram of a cross-sectional structure.

[0020] Figure 3 This is a schematic diagram of one type of impeller involved in this utility model.

[0021] Figure 4 yes Figure 3 A structural diagram from another perspective.

[0022] Figure 5 yes Figure 4 A schematic diagram of a frontal structure.

[0023] Figure 6 This is a cross-sectional structural schematic diagram of an impeller involved in this utility model.

[0024] Figure 7This is a cross-sectional structural diagram of a cover related to this utility model.

[0025] Figure 8 This is a cross-sectional structural diagram of an electric motor involved in this utility model.

[0026] Figure 9 yes Figure 8 A structural diagram from another perspective.

[0027] In the diagram: 1. Cover; 2. Impeller; 3. Blade; 4. Air inlet; 5. Air outlet; 6. Noise-reducing airflow space; 7. Air inlet surface; 8. Air outlet surface; 9. Guide surface; 10. Bottom surface; 12. Rear surface; 13. Front surface; 14. Motor body; 15. Shaft; 16. Cylindrical section; 17. Cylindrical air inlet section; 18. Flared horn section. Detailed Implementation

[0028] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0029] Example: Figures 1-7 As shown, the technical solution of the first technical subject of this utility model is: a fan, including a housing 1 and an impeller 2 disposed in the housing 1.

[0030] The difference between this technical solution and the prior art is that: the impeller 2 includes a chassis, and a number of blades 3 are arranged on the front surface 13 of the chassis and are centrally symmetrically distributed. The cover 1 is disposed opposite to the chassis. An air inlet 4 is provided at one end of the cover 1 opposite to the chassis. An air outlet 5 is provided between the cover 1 and the periphery of the impeller 2. The blades 3 have a spatial structure. The top surface of the blades 3 and the inner wall of the cover 1 form a noise-reducing airflow space 6.

[0031] In this technical solution, the structure of the impeller 2 in the fan is improved so that a noise-reducing airflow space 6 is formed between the impeller 2 and the casing 1, thereby achieving the purpose of noise reduction.

[0032] Specifically, at least the blade 3 with a regular flat structure in the existing technology is changed to a blade 3 with a spatial structure, so that a noise-reducing airflow space 6 is formed between the top surface of the blade 3 and the inner wall of the casing 1. This allows the airflow to be distributed more evenly from the air inlet 4 to the air outlet 5, and reduces the eddies formed between the impeller 2 and the casing 1, thereby achieving the purpose of reducing noise.

[0033] The above technical solution will then be further explained in detail:

[0034] In practical applications, the top surface of the blade 3 includes an air inlet surface 7, an air outlet surface 8, and a guide surface 9 disposed between the air inlet surface 7 and the air outlet surface 8. Both the air inlet surface 7 and the air outlet surface 8 are inclined surfaces. The air inlet surface 7 is inclined toward the air inlet 4, and the air outlet surface 8 is inclined toward the air outlet 5. The guide surface 9 is an arc-shaped surface that protrudes toward the cover 1.

[0035] In this technical solution, the top surface of the blade 3 is specifically defined, which helps the top surface of the blade 3 to conform to the airflow direction. This not only efficiently draws air from the outside of the fan into the inside of the fan through the air inlet 4 and then blows it out from the air outlet 5, but also reduces the possibility of airflow vortex, thus helping to reduce noise.

[0036] In practical applications, the bottom surface 10 of the blade 3 is arranged parallel to the guide surface 9, the blade 3 is perpendicular to the chassis, and both sides of each blade 3 are bent toward the circumference of the chassis.

[0037] In this technical solution, the bottom surface 10 of the blade 3 is parallel to the guide surface 9, which helps to further reduce airflow vortices and noise. The blade 3 is perpendicular to the chassis, which facilitates easier demolding during impeller 2 fabrication. The circumferential curvature of the blade 3 helps to increase the air intake and exhaust volume, thereby improving the fan's efficiency.

[0038] In practical applications, the diameters of the air inlet 4 and air outlet 5 of the impeller 2 are d1 and d2, respectively, with d1:d2 = 0.3 to 0.8. The ratio of d1 to d2 can be selected from any value between 0.3 and 0.8 according to the actual situation, such as 0.5, 0.6, 0.7, or 0.65.

[0039] In practical applications, the ratio of the distance H between the bottom surface 10 of the blade 3 and the guide surface 9 on the blade 3 to the diameter d2 at the air outlet 5 of the impeller 2 is: H:d2 = 1 / 4 to 3 / 4. The ratio of H to d2 can be selected as any value between 1 / 4 and 3 / 4 according to the actual situation, such as 1 / 2, 1 / 3, 5 / 12, 7 / 12, or 2 / 3, etc.

[0040] In this technical solution, the diameter ratio of the air inlet 4 to the air outlet 5 is conducive to a more balanced airflow within the fan, which helps reduce noise and ensures sufficient airflow and improves the fan's working efficiency.

[0041] In practical applications, the angle between the bottom surface 10 of the blade 3 and the air inlet surface 7 of the blade 3 is D, where 75°≤D≤105°. D can be selected from any value between 75° and 105° according to the actual situation, such as 80°, 90°, 95° or 101°.

[0042] In this technical solution, the blade 3 and the chassis are of an integral structure. The bottom surface 10 of the blade 3 is part of the chassis, that is, the junction part of the blade 3 and the chassis. The angular relationship between the bottom surface 10 of the blade 3 and the air inlet surface 7 is conducive to the efficient entry of the air outside the fan into the fan and the efficient discharge of the air through the fan, and can also ensure the smooth flow of the air flow inside the fan, which is conducive to reducing the working noise of the fan.

[0043] In practical applications, the rear surface 12 of the chassis is a plane, the rear surface 12 is perpendicular to the axis of the impeller 2, the front surface 13 of the chassis is a wind guiding surface, which gradually protrudes towards the air inlet 4 from the outer edge to the inner edge, and the included angle between the front surface 13 and the rear surface 12 is C, 30° ≤ C ≤ 60°. C can take any value between 30° and 60° according to the actual situation, such as 35°, 40°, 50° or 55°, etc.

[0044] In this technical solution, the shape of the front surface 13 of the chassis is conducive to sucking the wind from the air inlet 4, guiding the air flow to flow smoothly to the air outlet 5, and then discharging the air smoothly through the air outlet 5, reducing the generation of eddy currents in the air flow, which is conducive to reducing the noise generated by the eddy currents, and further conducive to reducing the working noise of the fan.

[0045] In practical applications, the housing 1 includes a cylindrical part 16 and a wind guiding part arranged in the inner cavity of the cylindrical part 16. The wind guiding part includes a cylindrical air inlet part 17 and a flared horn part 18 with two ends respectively connected to the cylindrical part 16 and the cylindrical air inlet part 17. The inclination angle E of the flared horn part 18 is adapted to the inclination angle of the front surface 13 of the chassis, and the inner diameter H1 of the cylindrical air inlet part 17 is smaller than the diameter d2 at the air outlet 5 of the impeller 2.

[0046] In this technical solution, the inclination angle E of the flared horn part 18 is adapted to the inclination angle of the front surface 13 of the chassis, that is, the value of the inclination angle E is adapted to the value of the included angle C between the front surface 13 and the rear surface 12, and the difference between the inclination angle E and the included angle C is ±30°. H1 < d2 is conducive to ensuring that the noise reduction air flow circulation space 6 inside the fan can reduce eddy currents and achieve the purpose of noise reduction. The inner diameter H2 of the outlet of the wind guiding part is matched with the outer shell size of the motor.

[0047] In this technical solution, the distance H is used to ensure that the fan has sufficient wind guiding efficiency, so as to ensure the overall blowing efficiency of the fan. The ratio between the distance H and the diameter d2 is conducive to ensuring the matching of the wind guiding efficiency and the air outlet efficiency, preventing the air flow from staying or swirling inside the fan to generate eddy currents, thereby preventing the generation of noise due to eddy currents, and further ensuring that the working noise of the fan is low.

[0048] In practical applications, the angle between the air inlet end of the blade 3 and the tangent of its location is the air inlet angle B, where 60°≤B≤90°.

[0049] In this technical solution, limiting the air inlet angle helps to reduce the impact noise generated by the airflow colliding with the corresponding parts of the fan during air intake, and also helps to reduce the noise generated by the airflow vortex, thereby ensuring low fan operating noise.

[0050] In practical applications, the angle between the air outlet end of the blade 3 and the tangent of its location is the air outlet angle A, where 45°≤A≤75°.

[0051] In this technical solution, limiting the air outlet angle helps to reduce the airflow inside the fan from the inside to the outside quickly, reducing obstruction and reducing the impact noise caused by the airflow colliding with the corresponding parts of the fan when the air is discharged. It also helps to reduce the noise generated by the vortex of the airflow, thereby ensuring low operating noise of the fan.

[0052] Example 2: As Figure 8 and Figure 9 As shown, the technical solution of the second technical subject of this utility model is: an electric motor, including a motor body 14 and a fan detachably fixed on the rotating shaft 15 of the motor body 14.

[0053] This technical solution utilizes the fan described in Embodiment 1 (such as...). Figures 1-7 As shown, the impeller 2 in the fan has a shaft hole in the middle, the rotating shaft 15 passes through the shaft hole and forms a detachable fixed fit with the impeller 2, the air outlet 5 on the fan is along the axial direction of the motor body 14 and the air outlet 5 faces the motor body 14, and the inner diameter of the cover 1 is larger than the outer diameter of the motor body 14 corresponding to the air outlet 5.

[0054] In this technical solution, a fan with noise reduction effect is applied to the motor, which makes the motor work with low noise. This helps to reduce the working noise of household appliances (such as household water pumps) that use this motor, ensuring a low noise environment and providing people with a more comfortable living, learning and working environment.

[0055] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fan comprising a housing (1) and an impeller (2) disposed within the housing (1), characterized in that... The impeller (2) includes a chassis, a number of blades (3) arranged on the front surface (13) of the chassis and distributed in a centrally symmetrical manner, the cover (1) is disposed away from the chassis, the end of the cover (1) away from the chassis is provided with an air inlet (4), and there is an air outlet (5) between the outer periphery of the cover (1) and the impeller (2), the blades (3) have a spatial structure, and the top surface of the blades (3) and the inner wall of the cover (1) form a noise reduction airflow space (6).

2. The fan according to claim 1, characterized in that... The top surface of the blade (3) includes an air inlet surface (7), an air outlet surface (8), and a guide surface (9) disposed between the air inlet surface (7) and the air outlet surface (8). Both the air inlet surface (7) and the air outlet surface (8) are inclined surfaces. The air inlet surface (7) is inclined toward the air inlet (4), and the air outlet surface (8) is inclined toward the air outlet (5). The guide surface (9) is an arc-shaped surface that protrudes toward the cover (1).

3. The fan according to claim 2, characterized in that... The bottom surface (10) of the blade (3) is parallel to the guide surface (9), and the blade (3) is perpendicular to the chassis. Both sides of each blade (3) are bent toward the circumference of the chassis.

4. The fan according to claim 1, 2, or 3, characterized in that... The diameters of the air inlet (4) and air outlet (5) of the impeller (2) are d1 and d2, respectively, where d1:d2 = 0.3 to 0.

8. The ratio of the distance H between the bottom surface (10) of the blade (3) and the guide surface (9) on the blade (3) to the diameter d2 of the air outlet (5) of the impeller (2) is: H:d2 = 1 / 4 to 3 / 4.

5. The fan according to claim 1, 2, or 3, characterized in that... The angle between the bottom surface (10) of the blade (3) and the air inlet surface (7) of the blade (3) is D, where 75°≤D≤105°.

6. The fan according to claim 1, 2, or 3, characterized in that... The rear surface (12) of the chassis is a plane, and the rear surface (12) is perpendicular to the axis of the impeller (2). The front surface (13) of the chassis is an air guide surface, which gradually protrudes towards the air inlet (4) from the outer edge to the inner edge. The included angle between the front surface (13) and the rear surface (12) is C, 30°≤C≤60°.

7. The fan according to claim 1, 2, or 3, characterized in that... The casing (1) includes a cylindrical part (16) and an air guide part disposed in the inner cavity of the cylindrical part (16). The air guide part includes a cylindrical air inlet part (17) and a flared horn part (18) with its two ends connected to the cylindrical part (16) and the cylindrical air inlet part (17) respectively. The tilt angle E of the flared horn part (18) is adapted to the tilt angle of the front surface (13) of the chassis. The inner diameter H1 of the cylindrical air inlet part (17) is smaller than the diameter d2 at the air outlet (5) of the impeller (2).

8. The fan according to claim 1, 2, or 3, characterized in that... The angle between the air inlet end of the blade (3) and the tangent of its location is the air inlet angle B, where 60°≤B≤90°.

9. The fan according to claim 8, characterized in that... The angle between the air outlet end of the blade (3) and the tangent of its location is the air outlet angle A, where 45°≤A≤75°.

10. An electric motor, comprising a motor body (14) and a fan detachably fixed to a shaft (15) on the motor body (14), characterized in that... The fan is the fan according to any one of claims 1-9. The impeller (2) is provided with a shaft hole in the middle. The rotating shaft (15) passes through the shaft hole and forms a detachable fixed fit with the impeller (2). The air outlet (5) on the fan is along the axial direction of the motor body (14) and the air outlet (5) faces the motor body (14). Corresponding to the air outlet (5), the inner diameter of the cover (1) is larger than the outer diameter of the motor body (14).

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