Unequal-angle noise reduction fan for motor

Abstract

The utility model belongs to the technical field of fans, and particularly relates to an unequal-angle noise reduction fan for a motor, which comprises a circular plate, a mounting sleeve is arranged in the middle of the circular plate, blades are mounted on the circular plate, and the blades are distributed around the mounting sleeve; the blades are distributed around the center line of the circular plate in an unequal angle mode, and the included angles between the blades are unequal. Mounting grooves are formed in the side faces, away from the mounting sleeve, of the blades, and sound absorption cotton is mounted in the mounting grooves. The noise reduction fan is simple in structure and capable of effectively reducing noise generated during operation of the fan.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans, in particular to an unequal angle noise reduction fan for a motor. Background Art

[0002] The blades of existing fans are usually composed of a hub and blades of equal length arranged at equal intervals on the periphery of the hub. When the fan is running, the blades generate a large flow resistance and generate a large noise, which causes noise pollution to the working environment and increases the power consumption of the fan. Utility Model Content

[0003] In order to make up for the deficiencies of the prior art and reduce the noise generated when the fan is running, the utility model provides an unequal angle noise reduction fan for a motor.

[0004] The technical solution adopted by the utility model to solve the technical problem is: the utility model is a non-uniform angle noise reduction fan for a motor, comprising a circular plate, a mounting sleeve is arranged at the middle position of the circular plate, blades are installed on the circular plate, and the blades are distributed around the mounting sleeve;

[0005] The blades are distributed at unequal angles around the center line of the circular plate, and the angles between the blades are not equal;

[0006] A mounting groove is provided on the side of the blade away from the mounting sleeve, and sound-absorbing cotton is installed in the mounting groove.

[0007] Preferably, a connecting ring is installed on the blade, and the connecting ring is located at the tip of the blade away from the mounting sleeve.

[0008] Preferably, a protrusion is provided on the sound-absorbing cotton, the protrusion is located outside the installation groove, and the protrusion is in an arc shape.

[0009] Preferably, a guide block is provided on the surface of the blade, the length direction of the guide block is the same as the length direction of the blade, and the height of one end of the guide block close to the mounting sleeve is greater than the height of one end of the guide block away from the mounting sleeve.

[0010] Preferably, the guide blocks are symmetrically arranged on both side surfaces of the blade, and a plurality of groups of guide blocks are arranged on the blade from top to bottom.

[0011] Preferably, a noise reduction hole is opened on the surface of the blade, and the inner wall of the noise reduction hole is polished with coarse sandpaper.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1. The utility model discloses an unequal-angle noise reduction fan for a motor. By arranging blades and sound-absorbing cotton, the blades are distributed at unequal angles around the center line of a circular plate, so that the angles between the blades are unequal. This is to utilize the asymmetry of the blade arrangement to avoid resonance of the blades and to help achieve better dynamic balance, thereby reducing vibration and noise. At the same time, the sound-absorbing cotton installed at the edge of the blades absorbs the noise generated during the operation of the fan, thereby further reducing the noise generated during the operation of the fan.

[0014] 2. The utility model discloses an unequal-angle noise reduction fan for a motor, which, by providing a connecting ring, a guide block and a noise reduction hole, enables the blades to be connected as a whole under the action of the connecting ring and avoids the tip on the edge of the blade from interfering with the airflow during rotation. At the same time, the guide block also guides the airflow to reduce mutual interference between the airflows, thereby further ensuring smooth and stable airflow, avoiding noise caused by turbulent airflow, and cooperating with the noise reduction hole to reduce the noise generated by the operation of the fan, thereby improving the noise reduction effect of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a top view of the fan in the utility model;

[0017] Figure 2 It is a structural schematic diagram of the fan in the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the fan in the utility model when the connecting ring and the sound-absorbing cotton are not installed;

[0019] Figure 4 It is a cross-sectional view of the sound-absorbing cotton on the fan in the utility model;

[0020] In the figure: a circular plate 1, a mounting sleeve 11, a blade 2, a guide block 21, a noise reduction hole 22, a mounting groove 23, a sound-absorbing cotton 24, a protrusion 241, and a connecting ring 3. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] like Figures 1 to 4 As shown, the utility model of the non-uniform angle noise reduction fan for the motor comprises a circular plate 1, a mounting sleeve 11 is arranged in the middle of the circular plate 1, blades 2 are mounted on the circular plate 1, and the blades 2 are distributed around the mounting sleeve 11;

[0023] The blades 2 are distributed at unequal angles around the center line of the circular plate 1, and the angles between the blades 2 are not equal;

[0024] The side of the blade 2 away from the mounting sleeve 11 is provided with a mounting groove 23, and a sound-absorbing cotton 24 is installed in the mounting groove 23;

[0025] An odd number of blades 2 is provided on the fan, such as eleven blades 2, so that the blades 2 are arranged asymmetrically on the fan, thereby avoiding the resonance problem caused when the fan adopts an even number of blades 2, avoiding the resonance to generate huge noise and causing damage to the fan. At the same time, an odd number of blades can also help to achieve better dynamic balance and reduce vibration and noise when the fan rotates;

[0026] At the same time, when the air driven by the blades 2 on the fan leaves the surface of the blades 2, the airflow generates turbulence, thereby generating noise. Therefore, sound-absorbing cotton 24 is installed on the side of the blade 2 away from the mounting sleeve 11. The sound-absorbing cotton 24 is used to absorb the noise caused by the turbulence at the edge of the blade 2, thereby reducing the noise generated when the fan rotates. At the same time, since the sound-absorbing cotton 24 is located on the side of the blade 2 away from the mounting sleeve 11, the sound-absorbing cotton 24 will not directly contact the airflow driven by the fan during the rotation of the fan, thereby avoiding the uneven surface of the position where the sound-absorbing cotton 24 is located, which disturbs the airflow driven by the blade 2, causing airflow turbulence and noise.

[0027] As an embodiment of the utility model, a connecting ring 3 is installed on the blade 2, and the connecting ring 3 is located at the tip of the blade 2 away from the mounting sleeve 11;

[0028] Since there is a tip at the edge of the blade 2 away from the mounting sleeve 11, when the fan is running, the tip at the edge of the blade 2 will disturb and interfere with the air, affecting the smooth and stable flow of the airflow along the surface of the blade 2, causing the airflow to be turbulent and generate noise. At the same time, a connecting ring 3 is installed at the edge of the blade 2, and the tips at the edges of each blade 2 are connected to each other by the connecting ring 3, so that the tip becomes an arc shape, thereby avoiding or reducing the disturbance and interference of the tip of the blade 2 on the air when the blade 2 rotates, reducing the resistance of the blade 2 when it rotates, and improving the smoothness of the airflow when it flows;

[0029] At the same time, since the tips at the edges of the blades 2 are connected to each other by the connecting ring 3, the ends of the blades 2 away from the mounting sleeve 11 are connected to each other as a whole, thereby improving the structural strength and stability of the fan blades, reducing the possibility of vibration and resonance when the fan is rotating, avoiding noise caused by vibration and resonance, and at the same time, it can also increase the speed of the fan, thereby improving the heat dissipation effect of the fan on the motor.

[0030] As an embodiment of the utility model, the sound-absorbing cotton 24 is provided with a protrusion 241, the protrusion 241 is located outside the installation groove 23, and the protrusion 241 is in an arc shape;

[0031] A protrusion 241 is provided on the sound-absorbing cotton 24, so that the sound-absorbing cotton 24 covers the side of the blade 2 away from the mounting sleeve 11, increasing the contact area between the sound-absorbing cotton 24 and the noise, thereby facilitating the sound-absorbing cotton 24 to absorb noise and reduce the noise generated by the operation of the fan. At the same time, the protrusion 241 is in an arc shape, so that the side of the blade 2 away from the mounting sleeve 11 is relatively smooth, reducing the disturbance of the airflow at the edge of the blade 2 and ensuring a good noise reduction effect.

[0032] As an embodiment of the utility model, a guide block 21 is provided on the surface of the blade 2, the length direction of the guide block 21 is the same as the length direction of the blade 2, and the height of one end of the guide block 21 close to the mounting sleeve 11 is greater than the height of the other end of the guide block 21 away from the mounting sleeve 11;

[0033] A guide block 21 is provided on the surface of the blade 2 so that the airflow driven by the blade 2 is separated and guided by the guide block 21, thereby ensuring that the airflow on the surface of the blade 2 flows smoothly, avoiding mutual interference between the airflows, turbulence and eddy currents, and further reducing the noise generated when the fan rotates.

[0034] As an embodiment of the utility model, the guide blocks 21 are symmetrically arranged on both sides of the blade 2, and multiple groups of guide blocks 21 are arranged on the blade 2 from top to bottom;

[0035] By installing multiple sets of guide blocks 21 on the blades 2, the structure of the blades 2 is strengthened, and the structural strength and rigidity of the blades 2 are improved, thereby preventing the blades 2 from deforming, vibrating or resonating during operation, which causes the blades 2 to generate noise. At the same time, by setting up multiple sets of guide blocks 21, the airflow passing through the surface of the blades 2 is guided, making the air flow smoother and more stable, reducing the turbulence generated during the air flow, and thus improving the noise reduction effect when the fan rotates.

[0036] As an embodiment of the utility model, a noise reduction hole 22 is opened on the surface of the blade 2, and the inner wall of the noise reduction hole 22 is polished with coarse sandpaper;

[0037] The noise reduction holes 22 are provided to reduce the boundary layer separation caused by the airflow separating from the surface of the blade 2 during the rotation of the blade 2, thereby ensuring the smooth and stable flow of the airflow, thereby avoiding the airflow turbulence and the generation of high-decibel noise;

[0038] At the same time, the inner wall of the noise reduction hole 22 is frosted or polished with coarse sandpaper, so that the inner wall of the noise reduction hole 22 is relatively rough. After the noise enters the noise reduction hole 22, the noise will be continuously emitted and refracted on the rough inner wall of the noise reduction hole 22, increasing and accelerating the loss and absorption of noise in the noise reduction hole 22, thereby further improving the noise reduction effect of the fan.

[0039] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An unequal-angle noise reduction fan for a motor, comprising a circular plate (1), a mounting sleeve (11) being arranged in the middle of the circular plate (1), blades (2) being mounted on the circular plate (1), and the blades (2) being distributed around the mounting sleeve (11); Features: The blades (2) are distributed at unequal angles around the center line of the circular plate (1), and the angles between the blades (2) are unequal; A mounting groove (23) is provided on the side of the blade (2) away from the mounting sleeve (11), and a sound-absorbing cotton (24) is installed in the mounting groove (23).

2. The unequal angle noise reduction fan for a motor according to claim 1, characterized in that: A connecting ring (3) is installed on the blade (2), and the connecting ring (3) is located at the tip of the blade (2) at one end away from the installation sleeve (11).

3. The unequal angle noise reduction fan for a motor according to claim 1, characterized in that: The sound-absorbing cotton (24) is provided with a protrusion (241), the protrusion (241) is located outside the installation groove (23), and the protrusion (241) is in an arc shape.

4. The unequal angle noise reduction fan for a motor according to claim 1, characterized in that: A guide block (21) is provided on the surface of the blade (2); the length direction of the guide block (21) is the same as the length direction of the blade (2); and the height of one end of the guide block (21) close to the mounting sleeve (11) is greater than the height of one end of the guide block (21) away from the mounting sleeve (11).

5. The unequal angle noise reduction fan for a motor according to claim 4, characterized in that: The guide blocks (21) are symmetrically arranged on both side surfaces of the blade (2), and a plurality of groups of guide blocks (21) are arranged on the blade (2) from top to bottom.

6. The unequal angle noise reduction fan for a motor according to claim 3, characterized in that: A noise reduction hole (22) is opened on the surface of the blade (2), and the inner wall of the noise reduction hole (22) is polished with coarse sandpaper.

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