Noise reduction device for motor

Abstract

The noise reduction device comprises a fan cover, two ends of the fan cover are open, an air channel extending along the axial direction of the fan cover is formed in the fan cover, the fan cover comprises a first cover body and a second cover body which are coaxial, the second cover body is detachably arranged at one end of the axial direction of the first cover body, and the first cover body and the second cover body are arranged in parallel. The first cover body and the second cover body are provided with openings, first silencing cotton is arranged on the inner circumferential face of the first cover body and the inner circumferential face of the second cover body, a silencing inner container is arranged in the second cover body and comprises an annular shell and second silencing cotton, and the second silencing cotton covers the end faces of the two axial sides of the annular shell and is opposite to the openings. According to the utility model, through dual functions of the first silencing cotton on the inner circumferential surfaces of the first cover body and the second cover body and the second silencing cotton in the silencing liner, noise generated during operation of the motor is obviously reduced, and a quieter working environment is provided for operators.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor noise reduction technical field, specifically, relate to a motor noise reduction device. BACKGROUND

[0002] During the operation of the motor, due to mechanical vibration, air flow disturbance and other factors, a large noise is often generated, and the motor noise not only affects the comfort of the working environment, but also may pose a threat to the hearing health of the operator. Therefore, an effective motor noise reduction device needs to be developed. SUMMARY

[0003] The utility model discloses a motor noise reduction device, through the double effect of the first sound-absorbing cotton on the inner circumferential surface of the first cover body and the second sound-absorbing cotton in the sound-absorbing inner container, the noise generated when the motor operates is significantly reduced, and a more quiet working environment is provided for the operator.

[0004] A motor noise reduction device, comprising a fan cover, the two ends of the fan cover are open, a fan duct extending along the axial direction of the fan cover is formed in the fan cover, the fan cover comprises a first cover body and a second cover body coaxially arranged, the second cover body is detachably arranged at one end of the first cover body in the axial direction, the inner circumferential surface of the first cover body and the second cover body is provided with first sound-absorbing cotton, a sound-absorbing inner container is arranged in the second cover body, the sound-absorbing inner container comprises an annular shell and second sound-absorbing cotton, the second sound-absorbing cotton is arranged on the end surface of the annular shell at both sides in the axial direction and opposite to the opening.

[0005] In the above technical scheme, the two ends of the fan cover are open, and the fan duct is formed in the fan cover to guide the air flow. When the motor operates, the noise generated is introduced into the fan duct along with the air flow. The inner circumferential surface of the first cover body and the second cover body is provided with first sound-absorbing cotton to preliminarily absorb the noise. The sound-absorbing inner container (including the annular shell and the second sound-absorbing cotton) in the second cover body further absorbs and isolates the noise. The second sound-absorbing cotton is arranged on the end surface of the annular shell at both sides in the axial direction and opposite to the opening of the fan duct to ensure that the noise is absorbed by multiple layers of sound-absorbing materials during the propagation process.

[0006] Further, a plurality of support ribs are arranged between the second cover body and the annular shell, the two ends of each support rib are connected to the outer circumferential surface of the annular shell and the inner circumferential surface of the second cover body respectively, and the plurality of support ribs are uniformly distributed along the circumferential direction of the annular shell.

[0007] In the above technical scheme, the addition of the support ribs significantly enhances the connection strength between the sound-absorbing inner container and the second cover body, so that the entire noise reduction device is more stable and reliable, which helps to reduce the structural looseness or damage caused by vibration or air flow impact.

[0008] Further, the end faces of the annular shell on both axial sides are also provided with a plurality of first fixing members, and the first fixing members are used for fixing the second sound-absorbing cotton to the annular shell.

[0009] In the above technical solution, the first fixing member fixes the second sound-absorbing cotton on the end face of the annular shell, ensuring that the sound-absorbing material can fully play its noise reduction effect. This close fit reduces the leakage of noise and improves the noise reduction performance of the entire noise reduction device.

[0010] Further, the second cover body is provided with a flow guide opening near the first cover body, and the diameter of the flow guide opening gradually increases from one end near the first cover body to the sound-absorbing inner container.

[0011] In the above technical solution, the design of the flow guide opening helps to reduce the turbulence and vortex generated by the airflow in the fan cover, thereby reducing the noise level.

[0012] Further, the inner circumferential surfaces of the first cover body and the second cover body are respectively provided with a plurality of second fixing members for fixing the first sound-absorbing cotton.

[0013] In the above technical solution, through the fixing effect of the second fixing member, the connection between the first sound-absorbing cotton and the first cover body and the second cover body is more firm and reliable, which helps to prevent the sound-absorbing material from falling off or shifting due to vibration or airflow impact during motor operation, thereby maintaining the long-term stability of the noise reduction device.

[0014] Further, the opening includes a first opening on the first cover body and a second opening on the second cover body, and the diameter of the first opening is greater than the diameter of the second opening.

[0015] In the above technical solution, the diameter difference between the first opening and the second opening helps to optimize the noise reduction effect. The larger first opening can more smoothly accommodate the airflow, reducing the generation of noise; and the smaller second opening helps to further compress and slow down the airflow speed, reducing the spread of noise.

[0016] Further, the second opening is provided with a dust screen.

[0017] In the above technical solution, the first sound-absorbing cotton and the second sound-absorbing cotton and other noise reduction materials inside the noise reduction device are sensitive to dust. Long-term exposure to a dusty environment may gradually degrade the performance of the noise reduction materials. The provision of the dust screen helps to maintain the cleanliness inside the noise reduction materials and prolong their service life.

[0018] Further, the first cover body is provided with a plurality of first mounting holes near one end of the second cover body, the second cover body is provided with a plurality of second mounting holes near one end of the first cover body, and the first mounting holes and the second mounting holes are one-to-one opposite.

[0019] In the above technical solution, the one-to-one correspondence relationship between the first mounting hole and the second mounting hole enables the first cover body and the second cover body to be easily connected together by bolts, nuts or other fasteners. This design greatly simplifies the assembly process of the device and improves the assembly efficiency.

[0020] Compared with the prior art, the wind cover has the following beneficial effects: the two ends of the wind cover are open, and an air duct is formed inside to guide air flow. When the motor is running, the noise generated enters the air duct along with the air flow. The inner circumferential surface of the first cover body and the second cover body is provided with first sound-absorbing cotton to preliminarily absorb the noise. The sound-absorbing inner liner (including the annular shell and the second sound-absorbing cotton) in the second cover body further absorbs and isolates the noise. The second sound-absorbing cotton cover is arranged on the axial two side end faces of the annular shell and opposite to the air duct openings, so as to ensure that the noise is absorbed by the multiple layers of sound-absorbing materials during the propagation process. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a perspective view of the wind cover of the embodiment of the utility model.

[0022] Figure 2 It is a cross-sectional view of the wind cover of the embodiment of the utility model.

[0023] Figure 3 It is a perspective view of the second cover body of the embodiment of the utility model.

[0024] Figure 4 It is a perspective view of the wind cover of the embodiment of the utility model from another angle.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1, wind cover; 101, first cover body; 1011, first opening; 1012, first mounting hole; 102, second cover body; 1021, flow guide opening; 1022, second opening; 1023, second mounting hole; 103, opening; 104, air duct;

[0027] 2, first sound-absorbing cotton;

[0028] 3, sound-absorbing inner liner; 301, annular shell; 302, second sound-absorbing cotton; 303, support rib; 304, first fixing member;

[0029] 4, second fixing member; 5, dust screen. DETAILED DESCRIPTION

[0030] The motor noise reduction device of the utility model will be further described in detail below in combination with specific embodiments and drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein.

[0031] Please refer to Figure 1 and Figure 2 In a preferred embodiment, the motor noise reduction device comprises a fan cover 1, two open ends 103 of the fan cover 1, a wind tunnel 104 formed inside the fan cover 1 extending along its axial direction, the fan cover 1 comprises a coaxial first cover body 101 and a second cover body 102, the second cover body 102 is detachably arranged at one end of the first cover body 101 in the axial direction, the inner circumferential surface of the first cover body 101 and the second cover body 102 is provided with a first sound-absorbing cotton 2, and the second cover body 102 is provided with a sound-absorbing inner container 3, the sound-absorbing inner container 3 comprises an annular shell 301 and a second sound-absorbing cotton 302, and the second sound-absorbing cotton 302 is arranged on the end surface of the annular shell 301 at both axial sides and opposite to the opening 103.

[0032] In actual application, the fan cover 1 is composed of the coaxial first cover body 101 and the second cover body 102, forming a wind tunnel 104 extending along the axial direction. The main function of this wind tunnel 104 is to guide the airflow generated during the operation of the motor and reduce the propagation of noise in the process. The two open ends 103 of the fan cover 1 allow air to freely enter and exit, while also helping to dissipate heat. The inner circumferential surface of the first cover body 101 and the second cover body 102 is provided with the first sound-absorbing cotton 2, which is a sound-absorbing material that can effectively absorb and attenuate noise. The second cover body 102 is additionally provided with a sound-absorbing inner container 3, which is composed of an annular shell 301 and a second sound-absorbing cotton 302. The second sound-absorbing cotton 302 is arranged on the end surface of the annular shell 301 at both axial sides and opposite to the opening 103 of the wind tunnel 104, forming an additional noise barrier. This multi-layer sound-absorbing design can significantly improve the noise reduction effect. The second cover body 102 is detachably mounted at one end of the first cover body 101, which facilitates user maintenance and replacement of sound-absorbing materials. When the sound-absorbing cotton loses its effectiveness due to long-term use, the user can easily detach the second cover body 102 and replace it with new sound-absorbing cotton, thereby maintaining the long-term effectiveness of the noise reduction device.

[0033] Further, please refer to Figure 1 and Figure 3The second cover body 102 and the annular shell 301 are provided with a plurality of support ribs 303, the two ends of the support ribs 303 are connected to the outer circumferential surface of the annular shell 301 and the inner circumferential surface of the second cover body 102 respectively, and the plurality of support ribs 303 are uniformly distributed along the circumference of the annular shell 301. In the motor noise reduction device, the plurality of support ribs 303 arranged between the second cover body 102 and the annular shell 301 play a key role in structural support. The two ends of these support ribs 303 are firmly connected to the outer circumferential surface of the annular shell 301 and the inner circumferential surface of the second cover body 102 respectively, forming a stable support network. They are uniformly distributed along the circumference of the annular shell 301, ensuring the stability and uniform stress of the entire sound attenuation inner container 3 in the second cover body 102. Specifically, when the motor is running, the vibration and airflow impact generated may have a certain impact on the sound attenuation inner container 3. The presence of the support ribs 303 can effectively resist these external forces and prevent the sound attenuation inner container 3 from shifting or deforming, thereby maintaining its optimal noise reduction effect. At the same time, the support ribs 303 can also guide the flow of airflow to a certain extent, reducing the formation of turbulent flow and vortex, further reducing the generation of noise.

[0034] Please refer to Figure 1 , the end faces of the annular shell 301 on both axial sides are also provided with a plurality of first fixing members 304, which are used to fix the second sound attenuation cotton 302 to the annular shell 301. The first fixing members 304 fix the second sound attenuation cotton 302 to the end face of the annular shell 301, ensuring that the sound attenuation material can fully play its noise reduction effect. This close fit reduces the leakage of noise and improves the noise reduction performance of the entire noise reduction device. Specifically, the first fixing members 304 can use bolts, buckles, adhesives or other fastening methods to tightly fit the second sound attenuation cotton 302 to the end face of the annular shell 301. In this way, the second sound attenuation cotton 302 can effectively absorb and isolate the noise generated during the operation of the motor, preventing it from being transmitted outward through the air duct 104.

[0035] Further, please refer to Figure 2 , Figure 3 and Figure 4 , the second cover body 102 is provided with a flow guide opening 1021 near the first cover body 101, and the diameter of the flow guide opening 1021 gradually increases from the end near the first cover body 101 towards the sound attenuation inner container 3. The design of the flow guide opening 1021 helps to reduce the turbulent flow and vortex generated in the second cover body 102, thereby reducing the generation and propagation of noise. When the motor is running, the airflow generated will pass through the flow guide opening 1021 into the air duct inside the second cover body 102. Due to the gradually increasing diameter of the flow guide opening 1021, the airflow will undergo a smooth transition when entering the air duct 104, reducing the turbulent flow and vortex caused by sudden expansion or contraction. This smooth airflow flow helps to reduce noise generation and improve the overall performance of the noise reduction device.

[0036] Please refer to Figure 2 The inner circumferential surfaces of the first cover body 101 and the second cover body 102 are respectively provided with a plurality of second fixing members 4 for fixing the first sound-absorbing cotton 2. Through the fixing action of the second fixing members 4, the connection between the first sound-absorbing cotton 2 and the first cover body 101 and the second cover body 102 is more firm and reliable, which helps to prevent the sound-absorbing material from falling off or shifting due to vibration or airflow impact during the operation of the motor, thereby maintaining the long-term stability of the noise reduction device.

[0037] In some embodiments of the present application, the opening 103 includes a first opening 1011 located on the first cover body 101 and a second opening 1022 located on the second cover body 102, and the diameter of the first opening 1011 is larger than that of the second opening 1022. The diameter difference between the first opening 1011 and the second opening 1022 helps to optimize the noise reduction effect. The larger first opening 1011 can more smoothly admit airflow, reducing noise generation; while the smaller second opening 1022 helps to further compress and slow down airflow speed, reducing noise propagation. When the motor is running, the generated airflow first enters the fan cover 1 through the larger-diameter first opening 1011. Since the first opening 1011 is larger, it can more smoothly admit airflow, reducing the formation of turbulent flow and vortex, thereby reducing noise generation. As the airflow flows in the axial direction in the air duct 104 within the fan cover 1, it is gradually hindered and absorbed by the first sound-absorbing cotton 2 and the second sound-absorbing cotton 302, further reducing the noise level. When the airflow approaches the second cover body 102, it will flow out of the fan cover 1 through the smaller-diameter second opening 1022. Since the second opening 1022 has a smaller diameter, the airflow will be limited to a certain extent when flowing out, which helps to further compress and slow down the airflow speed, thereby reducing noise propagation. At the same time, the design of the second opening 1022 also takes into account the heat dissipation requirement, ensuring that the motor will not overheat during operation.

[0038] Further, please refer to Figure 2 A dust screen 5 is provided on the second opening 1022. The noise reduction materials such as the first sound-absorbing cotton 2 and the second sound-absorbing cotton 302 inside the noise reduction device are relatively sensitive to dust. Long-term exposure to a dusty environment may gradually degrade the performance of the noise reduction materials. The provision of the dust screen 5 helps to maintain the cleanliness inside the noise reduction materials, prolonging their service life.

[0039] It should be noted that in some embodiments of the utility model, first cover body 101 is equipped with several first mounting holes 1012 near one end of second cover body 102, second cover body 102 is equipped with several second mounting holes 1023 near one end of first cover body 101, and first mounting hole 1012 and second mounting hole 1023 are one-to-one corresponding. The one-to-one correspondence of first mounting hole 1012 and second mounting hole 1023 makes first cover body 101 and second cover body 102 can be easily connected together by bolts, nuts or other fasteners. This design greatly simplifies the assembly process of the device, improves the assembly efficiency. When it is necessary to clean or replace the noise reduction material, the user can easily separate the first cover body 101 and the second cover body 102 by disassembling the fasteners. This design makes the maintenance work more simple and efficient.

[0040] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0041] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0042] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0043] Although the description of the utility model is combined with the above specific embodiments, it is obvious that many substitutions, modifications and changes can be made according to the above content for those skilled in the art. Therefore, all such alternatives, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A noise reduction device for an electric machine, characterized by, The utility model provides a wind cover, both ends of the wind cover are open, a wind channel extending along the axial direction is formed in the wind cover, the wind cover comprises a first cover body and a second cover body which are coaxial, the second cover body is detachably arranged at one end of the first cover body in the axial direction, the inner circumferential surface of the first cover body and the second cover body is provided with first sound-absorbing cotton, the second cover body is internally provided with a sound-absorbing inner container, the sound-absorbing inner container comprises an annular shell and second sound-absorbing cotton, the second sound-absorbing cotton is arranged on the end face of the annular shell at both axial sides and is opposite to the opening.

2. The noise reduction device for an electric machine according to claim 1, characterized by A plurality of support ribs are arranged between the second cover body and the annular shell, both ends of the support rib are connected with the outer circumferential surface of the annular shell and the inner circumferential surface of the second cover body respectively, and the plurality of support ribs are uniformly distributed along the circumferential direction of the annular shell.

3. The noise reduction device for an electric machine according to claim 1, characterized by The end face of the annular shell at both axial sides is further provided with a plurality of first fixing members for fixing the second sound-absorbing cotton to the annular shell.

4. The noise reduction device for an electric machine according to claim 1, characterized by A flow guide opening is arranged in the second cover body close to the first cover body, and the diameter of the flow guide opening gradually increases from one end close to the first cover body to the sound-absorbing inner container.

5. The noise reduction device for an electric machine according to claim 1, characterized by A plurality of second fixing members for fixing the first sound-absorbing cotton are arranged on the inner circumferential surface of the first cover body and the second cover body respectively.

6. The noise reduction device for an electric machine according to claim 1, characterized by The opening comprises a first opening on the first cover body and a second opening on the second cover body, and the diameter of the first opening is greater than that of the second opening.

7. The noise reduction device for an electric machine according to claim 6, characterized by A dustproof screen is arranged on the second opening.

8. The noise reduction device for an electric machine according to claim 1, characterized by A plurality of first mounting holes are arranged on one end of the first cover body close to the second cover body, a plurality of second mounting holes are arranged on one end of the second cover body close to the first cover body, and the first mounting holes are opposite to the second mounting holes one by one.

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