Noise reduction device

Abstract

The invention provides a noise reduction device which is used for enclosing the periphery of equipment to be subjected to noise reduction, the noise reduction device comprises a carrier and a noise reduction unit assembled on the carrier, the noise reduction unit is located on the side, facing the equipment to be subjected to noise reduction, of the carrier, and the width of the noise reduction unit is gradually reduced in the direction from the carrier to the equipment to be subjected to noise reduction. According to the noise reduction device, the noise reduction device is arranged on the periphery of the high-rotating-speed device, namely the equipment to be subjected to noise reduction, and the width of the noise reduction unit of the noise reduction device is gradually reduced in the direction from the carrier of the noise reduction device to the equipment to be subjected to noise reduction, so that sound waves can smoothly enter the interior of the noise reduction unit, and sound wave reflection is absorbed to the maximum extent; therefore, the sound absorption efficiency is greatly improved, a noise propagation path is blocked, a better noise reduction effect is achieved, and better experience is provided for a user.

Description

Technical Field

[0001] This invention belongs to the field of noise reduction design technology, and specifically relates to a noise reduction device. Background Technology

[0002] Some large central air conditioning and data center cooling systems typically require high-speed motors to simultaneously drive the compressor and lubricating oil circulation pump. Additionally, high-speed, low-flow pumps are often used in lubricating oil return systems. Since high-speed motors or pumps operate at speeds between 10,000 and 100,000 rpm, this high-speed rotation can cause fluid turbulence, cavitation, and cavitation, generating significant fluid noise. Furthermore, imbalances in bearings, shafts, and impellers under high-speed operation amplify vibrations, leading to mechanical noise. Therefore, the overall noise level of the unit is relatively high, negatively impacting the user experience. Summary of the Invention

[0003] Therefore, the present invention provides a noise reduction device that can solve the technical problem that existing high-speed devices have high noise levels, which affects the user experience.

[0004] To address the aforementioned problems, the present invention provides a noise reduction device for surrounding a device to be noise-reduced. The device comprises a carrier and a noise reduction unit assembled on the carrier. The noise reduction unit is located on the side of the carrier facing the device to be noise-reduced, and the width of the noise reduction unit gradually decreases from the carrier to the device to be noise-reduced.

[0005] In some embodiments, the noise reduction unit is provided with an adjustment mechanism for adjusting the length of the noise reduction unit.

[0006] In some embodiments, the adjustment mechanism includes a motor, a screw, and a push rod. The motor is fixed to the carrier, and the output shaft of the motor is connected to the screw. The push rod has a threaded hole and a socket, which communicate with each other. The screw is threaded into the threaded hole and inserted into the socket. The end of the push rod away from the motor is connected to the noise reduction unit. During the process of the motor driving the screw to rotate, the push rod can move along the screw to adjust the length of the noise reduction unit.

[0007] In some embodiments, the adjustment mechanism further includes a first support rod assembly, the push rod having a first sliding groove extending along the moving direction of the push rod, one end of the first support rod assembly being rotatably connected to the carrier, and the other end of the first support rod assembly being slidably disposed within the first sliding groove.

[0008] In some embodiments, the adjustment mechanism further includes a second support rod assembly, the push rod having a second sliding groove extending along the moving direction of the push rod, one end of the second support rod assembly being rotatably connected to the carrier, and the other end of the second support rod assembly being slidably disposed within the second sliding groove.

[0009] In some embodiments, the noise reduction unit includes a sound-permeable damping cloth and a sound-absorbing structure wrapped within the sound-permeable damping cloth.

[0010] In some embodiments, the end of the push rod away from the motor is connected to the sound-permeable damping cloth, the end of the first support rod assembly away from the push rod abuts against the sound-permeable damping cloth, the end of the second support rod assembly away from the push rod abuts against the sound-permeable damping cloth, the push rod, the first support rod assembly, and the second support rod assembly are all located within the sound-permeable damping cloth, and the push rod, the first support rod assembly, and the second support rod assembly together open up the sound-permeable damping cloth.

[0011] In some embodiments, the carrier is provided with a first groove and a receiving groove, the first strut assembly includes a first strut and a first pulley mounted on one end of the first strut, the first pulley is also located in the first groove, and the sound-permeable damping cloth extends into the receiving groove after passing around the first pulley in the first groove.

[0012] In some embodiments, the first strut assembly further includes a first roller mounted on the end of the first strut away from the first pulley, and the first roller is also located within the first groove.

[0013] In some embodiments, the carrier is provided with a second groove and a receiving groove, the second strut assembly includes a second strut and a second pulley mounted on one end of the second strut, the second pulley is also located in the second groove, and the sound-permeable damping cloth extends into the receiving groove after passing around the second pulley in the second groove.

[0014] In some embodiments, the second strut assembly further includes a second roller mounted on the end of the second strut away from the second pulley, and the second roller is also located within the second groove.

[0015] In some embodiments, the number of noise reduction units disposed on the carrier is multiple, and each noise reduction unit is located on the side of the carrier facing the noise reduction device. The width of each noise reduction unit gradually decreases from the carrier to the noise reduction device.

[0016] In some embodiments, the noise reduction units are staggered on the carrier.

[0017] In some embodiments, a cooling structure is mounted on the carrier.

[0018] The noise reduction device provided by this invention has the following beneficial effects: By surrounding the high-speed device (i.e., the device to be noise-reduced) with noise-reducing devices, and by gradually reducing the width of the noise-reducing unit from the carrier of the noise-reducing device to the device to be noise-reduced, this design allows sound waves to smoothly enter the interior of the noise-reducing unit, maximizing the absorption of sound wave reflections, thereby greatly improving sound absorption efficiency, blocking the noise propagation path, achieving better noise reduction effect, and providing users with a better experience. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a noise reduction device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the cooling structure of the noise reduction device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the noise reduction device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the adjustment mechanism of the noise reduction device according to an embodiment of the present invention adjusting the noise reduction unit to its shortest state; Figure 5 This is a schematic diagram of the adjustment mechanism of the noise reduction device according to an embodiment of the present invention, showing the noise reduction unit adjusted to its longest state.

[0021] The reference numerals in the attached figures are as follows: 1. Carrier; 2. Noise reduction unit; 21. Sound-permeable damping cloth; 22. Sound-absorbing structure; 3. Motor; 4. Screw; 5. Push rod; 6. First slide groove; 7. Second slide groove; 8. Receiving groove; 9. First support rod; 10. First pulley; 11. First roller; 12. Second support rod; 13. Second pulley; 14. Second roller; 15. Cooling structure. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0026] See also Figures 1 to 5 As shown, according to an embodiment of the present invention, a noise reduction device is provided for surrounding the device to be noise-reduced, including a carrier 1 and a noise reduction unit 2 assembled on the carrier 1. The noise reduction unit 2 is located on the side of the carrier 1 facing the device to be noise-reduced, and the width of the noise reduction unit 2 gradually decreases from the carrier 1 to the device to be noise-reduced.

[0027] In this technical solution, a noise reduction device is placed around the high-speed device, i.e. the noise reduction equipment to be noise-reduced. The width of the noise reduction unit 2 of the noise reduction device gradually decreases from the carrier 1 of the noise reduction device to the noise reduction equipment. This design allows the sound waves to enter the interior of the noise reduction unit 2 smoothly, absorb the sound wave reflection to the maximum extent, thereby greatly improving the sound absorption efficiency, blocking the noise propagation path, achieving a better noise reduction effect, and giving users a better experience.

[0028] See also Figures 3 to 5 As shown, the noise reduction unit 2 is equipped with an adjustment mechanism, which is used to adjust the length of the noise reduction unit 2.

[0029] In this embodiment, the longer the noise reduction unit 2, the more complete the impedance gradient process, and the lower the lower limit of the noise frequency that can be absorbed. By adjusting the length of the noise reduction unit 2 through the adjustment mechanism, the acoustic impedance can be adjusted, thereby enabling the noise reduction unit 2 to absorb sound wave reflections of different frequencies, ultimately achieving the absorption of noise of different frequencies.

[0030] See also Figures 3 to 5 As shown, the adjustment mechanism includes a motor 3, a screw 4, and a push rod 5. The motor 3 is fixed on the carrier 1, and the output shaft of the motor 3 is connected to the screw 4. The push rod 5 has a threaded hole and an insertion hole inside, which are connected. The screw 4 is threaded into the threaded hole and inserted into the insertion hole. The end of the push rod 5 away from the motor 3 is connected to the noise reduction unit 2. During the process of the motor 3 driving the screw 4 to rotate, the push rod 5 can move along the screw 4 to adjust the length of the noise reduction unit 2.

[0031] In this technical solution, since the end of the push rod 5 away from the motor 3 is connected to the noise reduction unit 2, when the motor 3 drives the screw 4 to rotate so that the push rod 5 moves along the screw 4, the push rod 5 will stretch or shorten the noise reduction unit 2, thereby realizing the adjustable length of the noise reduction unit 2.

[0032] See also Figures 3 to 5 As shown, the adjustment mechanism also includes a first support rod assembly. A first slide groove 6 is constructed on the push rod 5. The first slide groove 6 extends along the moving direction of the push rod 5. One end of the first support rod assembly is rotatably connected to the carrier 1, and the other end of the first support rod assembly is slidably disposed in the first slide groove 6.

[0033] In this embodiment, when the motor 3 drives the screw 4 to rotate, the first support rod assembly restricts the rotation of the push rod 5, so the push rod 5 will not rotate synchronously with the screw 4, but will move along the screw 4. At the same time, as the push rod 5 moves along the screw 4, the other end of the first support rod assembly will also slide along the first slide groove 6. Thus, the first support rod assembly will not undergo substantial positional changes due to the movement of the push rod 5. Therefore, based on the adjustment mechanism realizing the adjustment of the length of the noise reduction unit 2, there will be no motion interference between the push rod 5 and the carrier 1.

[0034] See also Figures 3 to 5 As shown, the adjustment mechanism also includes a second support rod assembly. The push rod 5 is provided with a second slide groove 7, which extends along the moving direction of the push rod 5. One end of the second support rod assembly is rotatably connected to the carrier 1, and the other end of the second support rod assembly is slidably disposed in the second slide groove 7.

[0035] In this technical solution, when the motor 3 drives the screw 4 to rotate, the second support rod assembly restricts the rotation of the push rod 5, so the push rod 5 will not rotate synchronously with the screw 4, but will move along the screw 4. Simultaneously, as the push rod 5 moves along the screw 4, the other end of the second support rod assembly will also slide along the second slide groove 7. Therefore, the second support rod assembly will not undergo substantial positional changes due to the movement of the push rod 5. Thus, based on the adjustment mechanism's adjustment of the length of the noise reduction unit 2, there will be no motion interference between the push rod 5 and the carrier 1. It can be understood that the arrangement of the second support rod assembly results in two points of restriction for the push rod 5, increasing the number of force-bearing points and making the force on the push rod 5 more balanced, resulting in greater stability when the push rod 5 moves. Preferably, the first slide groove 6 and the second slide groove 7 are symmetrically distributed on the push rod 5, and the first support rod assembly and the second support rod assembly are symmetrically distributed relative to the push rod 5.

[0036] like Figure 4 As shown, the noise reduction unit 2 is at its shortest length when the other end of the first strut assembly is at the leftmost side of the first slide groove 6 and the other end of the second strut assembly is at the leftmost side of the second slide groove 7; Figure 5 As shown, the noise reduction unit 2 is at its longest length when the other end of the first support rod assembly is at the rightmost side of the first slide groove 6 and the other end of the second support rod assembly is at the rightmost side of the second slide groove 7. The positioning of the leftmost and rightmost ends of the two slide grooves is determined according to the length adjustment range of the noise reduction unit 2 and the length of the two support rods.

[0037] It should be noted that the length of noise reduction unit 2 is related to the frequency of the absorbed noise in the following way: f≈c / (4L) (where c is the speed of sound, approximately 380m / s).

[0038] Where c is the speed of sound, approximately 380 m / s; L is the length of noise reduction unit 2, in meters (m); and f is the sound frequency, in Hz. Taking high-speed pump noise reduction as an example, the sound frequency of the high-speed pump is: f = v 泵 ×n. Where, v 泵 'n' represents the pump's rotational speed in revolutions per second (rpm); 'n' represents the number of impeller blades. When the pump's speed is 11000 rpm and the impeller has 5 blades, the noise frequency is f = 917 Hz. The recommended length of the noise reduction unit 2 is L ≈ 105 mm (rounded to the nearest integer). After calculating the recommended length, the rotation direction and number of revolutions of the motor 3 are determined by comparing it with the current length. Initially, the length of the noise reduction unit 2 is L0. If the target length L < L0, the motor 3 rotates clockwise, the push rod 5 moves backward, and the length of the noise reduction unit 2 shortens. If the calculated L > L0, the motor 3 rotates counterclockwise, the push rod 5 moves forward, and the length of the noise reduction unit 2 lengthens. Furthermore, for each revolution of the motor 3, the distance the push rod 5 moves is equal to the pitch on the screw 4. Therefore, by calculating the difference between L and L0, and then dividing this difference by the pitch P of the screw 4, the number of revolutions N of the motor can be calculated (rounded to the nearest integer). Finally, the actual moving length L of push rod 5 was obtained. S =P*N, then L0±L S (Subtract clockwise and add counterclockwise) is assigned to L0 so that the length of noise reduction unit 2 can be adjusted again after the noise frequency changes.

[0039] See Figure 3 As shown, the noise reduction unit 2 includes a sound-permeable damping cloth 21 and a sound-absorbing structure 22 wrapped inside the sound-permeable damping cloth 21. Noise passes through the sound-permeable damping cloth 21 and is absorbed by the sound-absorbing structure 22, thereby achieving the effect of sound absorption and noise reduction. Specifically, the sound-absorbing structure 22 can be a high-density, porous foam made of melamine.

[0040] See Figures 3 to 5 As shown, the end of the push rod 5 away from the motor 3 is connected to the sound-permeable damping cloth 21. The end of the first support rod assembly away from the push rod 5 abuts against the sound-permeable damping cloth 21, and the end of the second support rod assembly away from the push rod 5 abuts against the sound-permeable damping cloth 21. The push rod 5, the first support rod assembly, and the second support rod assembly are all inside the sound-permeable damping cloth 21, and the push rod 5, the first support rod assembly, and the second support rod assembly together open the sound-permeable damping cloth 21.

[0041] In this embodiment, by using push rod 5, first support rod assembly and second support rod assembly to jointly open the sound-permeable damping cloth 21, the noise reduction unit 2 composed of flexible sound-permeable damping cloth 21 and sound-absorbing structure 22 can be erected and formed into a preset cone shape, thereby achieving a better sound absorption and noise reduction effect.

[0042] See Figures 3 to 5As shown, the carrier 1 has a first groove and a receiving groove 8. The first support rod assembly includes a first support rod 9 and a first pulley 10 installed at one end of the first support rod 9. The first pulley 10 is also located in the first groove. The sound-permeable damping cloth 21 extends into the receiving groove 8 after passing around the first pulley 10 in the first groove. The carrier 1 also has a second groove. The second support rod assembly includes a second support rod 12 and a second pulley 13 installed at one end of the second support rod 12. The second pulley 13 is also located in the second groove. The sound-permeable damping cloth 21 extends into the receiving groove 8 after passing around the second pulley 13 in the second groove.

[0043] In this technical solution, when the push rod 5 moves along the screw 4 to push the sound-permeable damping cloth 21, the first pulley 10 and the second pulley 13 will also rotate in the first groove and the second groove respectively. The pushing force of the push rod 5 and the rotational force of the pulleys will drive the sound-permeable damping cloth 21 out, thereby extending the sound-permeable damping cloth 21 forward and reducing the amount of sound-permeable damping cloth 21 contained in the receiving groove 8. Moreover, during the process of the sound-permeable damping cloth 21 extending forward, it will also drive the sound-absorbing structure 22 to move forward, and the amount of sound-absorbing structure 22 contained in the receiving groove 8 will also decrease, ultimately increasing the length of the entire noise reduction unit 2. When the push rod 5 moves along the screw 4 to pull the sound-permeable damping cloth 21, the first pulley 10 and the second pulley 13 will also rotate in the first groove and the second groove respectively. The pulling force of the push rod 5 and the rotational force of the pulleys will drive the sound-permeable damping cloth 21 back, thereby retracting the sound-permeable damping cloth 21 and increasing the amount of sound-permeable damping cloth 21 contained in the receiving groove 8. Furthermore, during the retraction of the sound-permeable damping cloth 21, the sound-absorbing structure 22 will also move backward, increasing the amount of sound-absorbing structure 22 that can be accommodated in the receiving groove 8, ultimately shortening the overall length of the noise reduction unit 2. It is understandable that during the retraction of the sound-permeable damping cloth 21, there may be insufficient retraction or wrinkling, but this does not affect the shortening of the overall length of the noise reduction unit 2 and can therefore be ignored. It should be noted that the filling of the sound-absorbing structure 22 within the sound-permeable damping cloth 21 avoids the first support rod 9 and the second support rod 12. Thus, during the forward or backward movement of the sound-permeable damping cloth 21, the two support rods will not obstruct the sound-absorbing structure 22.

[0044] See Figures 3 to 5 As shown, the first strut assembly also includes a first roller 11, which is mounted on the end of the first strut 9 away from the first pulley 10, and is also located within the first groove 6. The second strut assembly also includes a second roller 14, which is mounted on the end of the second strut 12 away from the second pulley 13, and is also located within the second groove 7.

[0045] In this embodiment, when the push rod 5 moves along the screw 4, the first roller 11 and the second roller 14 roll within the first groove 6 and the second groove 7 respectively. This reduces the friction between the first support rod assembly and the push rod 5, as well as between the second support rod assembly and the push rod 5, thereby ensuring that the push rod 5 moves with less resistance and smoother movement. It is understood that during the movement of the push rod 5, the first roller 11 and the second roller 14 are actually mainly rotating; it is only the movement of the push rod 5 that makes the two rollers appear to roll within the two grooves respectively.

[0046] See Figure 1 As shown, there are multiple noise reduction units 2 on the carrier 1. Each noise reduction unit 2 is located on the side of the carrier 1 facing the noise reduction device. The width of each noise reduction unit 2 gradually decreases from the carrier 1 to the noise reduction device.

[0047] In this technical solution, increasing the number of noise reduction units 2 enables the noise reduction device to absorb more sound wave reflections, thereby further improving sound absorption efficiency and achieving a better noise reduction effect. It should be noted that when there are multiple noise reduction units 2, each noise reduction unit 2 is equipped with an adjustment mechanism, and each adjustment mechanism can adjust the length of each noise reduction unit 2.

[0048] See Figure 1 As shown, the noise reduction units 2 are staggered on the carrier 1. This staggered distribution can prevent sound waves from being reflected or diffracted along a specific direction, thereby improving the absorption capability of sound waves incident from multiple angles. Specifically, the noise reduction units 2 are grouped into sets of three, and each group of noise reduction units 2 is arranged horizontally and vertically in a staggered manner on the carrier 1.

[0049] See also Figure 1 and Figure 2 As shown, a cooling structure 15 is installed on the carrier 1.

[0050] In this embodiment, after the high-speed device starts working, sound waves enter the interior of the noise reduction unit 2. Air molecules vibrate in the micropores of the sound-absorbing structure 22 and experience intense friction and adhesion with the pore walls, thereby dissipating the energy of the sound waves and blocking their transmission to achieve noise reduction. The dissipated sound wave energy is converted into a small amount of heat. When the unit operates for a long time, the heat generated by the sound wave accumulates, causing the noise reduction device to reach a high temperature. By installing a cooling structure 15 on the carrier 1, the device can be cooled when its temperature rises to a limit, thus preventing the noise reduction device from overheating. Specifically, as shown... Figure 2 As shown, the cooling structure 15 is formed by bending the cooling pipe multiple times. The bent cooling pipe is installed on the side of the carrier 1 facing away from the noise reduction unit 2. The coolant flows in from the inlet of the cooling pipe and flows out from the outlet of the cooling pipe to cool the noise reduction device.

[0051] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A noise reduction device for enclosing the periphery of a device to be noise reduced, characterized in that, The noise reduction unit (2) is gradually reduced in width from the carrier (1) to the equipment to be reduced in noise.

2. The noise reducing device of claim 1, wherein, The noise reduction unit (2) is provided with an adjusting mechanism for adjusting the length of the noise reduction unit (2).

3. The noise reducing device of claim 2, wherein, The adjusting mechanism comprises a motor (3), a screw rod (4) and a push rod (5), the motor (3) is fixed on the carrier (1), the output shaft of the motor (3) is connected with the screw rod (4), the push rod (5) is internally provided with a threaded hole and a insertion hole, the threaded hole and the insertion hole are communicated, the screw rod (4) is threadedly connected in the threaded hole and is inserted in the insertion hole, one end of the push rod (5) away from the motor (3) is connected with the noise reduction unit (2), in the process that the motor (3) drives the screw rod (4) to rotate, the push rod (5) can move along the screw rod (4) to adjust the length of the noise reduction unit (2).

4. The noise reducing device of claim 3, wherein, The adjusting mechanism further comprises a first support rod assembly, the push rod (5) is provided with a first sliding groove (6) extending along the moving direction of the push rod (5), one end of the first support rod assembly is rotatably connected on the carrier (1), the other end of the first support rod assembly is slidably arranged in the first sliding groove (6).

5. The noise reducing device of claim 4, wherein, The adjusting mechanism further comprises a second support rod assembly, the push rod (5) is provided with a second sliding groove (7) extending along the moving direction of the push rod (5), one end of the second support rod assembly is rotatably connected on the carrier (1), the other end of the second support rod assembly is slidably arranged in the second sliding groove (7).

6. The noise reducing device of claim 5, wherein, The noise reduction unit (2) comprises a sound permeable damping cloth (21) and a sound absorption structure (22) wrapped in the sound permeable damping cloth (21).

7. The noise reducing device of claim 6, wherein, One end of the push rod (5) away from the motor (3) is connected with the sound permeable damping cloth (21), one end of the first support rod assembly away from the push rod (5) abuts against the sound permeable damping cloth (21), one end of the second support rod assembly away from the push rod (5) abuts against the sound permeable damping cloth (21), the push rod (5), the first support rod assembly and the second support rod assembly are all in the sound permeable damping cloth (21), and the push rod (5), the first support rod assembly and the second support rod assembly jointly support the sound permeable damping cloth (21).

8. The noise reducing device of claim 7, wherein, A first recess and a containing groove (8) are formed on the carrier (1), the first support rod assembly comprises a first support rod (9) and a first pulley (10) mounted on one end of the first support rod (9), the first pulley (10) is also in the first recess, the sound permeable damping cloth (21) extends into the containing groove (8) after passing around the first pulley (10) in the first recess.

9. The noise reducing device of claim 8, wherein, The first supporting rod assembly further comprises a first roller (11) installed at one end of the first supporting rod (9) away from the first pulley (10), and the first roller (11) is also located in the first sliding groove (6).

10. The noise reducing device of claim 7, wherein, The carrier (1) is provided with a second groove and a containing groove (8), the second supporting rod assembly comprises a second supporting rod (12) and a second pulley (13) installed at one end of the second supporting rod (12), the second pulley (13) is also located in the second groove, and the sound permeable damping cloth (21) extends into the containing groove (8) after passing around the second pulley (13) in the second groove.

11. The noise reducing device of claim 10, wherein, The second supporting rod assembly further comprises a second roller (14) installed at one end of the second supporting rod (12) away from the second pulley (13), and the second roller (14) is also located in the second sliding groove (7).

12. The noise reducing device of any one of claims 1 to 11, wherein, The number of the noise reduction units (2) provided on the carrier (1) is multiple, each noise reduction unit (2) is located on the side of the carrier (1) facing the equipment to be reduced in noise, and the width of each noise reduction unit (2) gradually decreases from the carrier (1) to the equipment to be reduced in noise.

13. The noise reducing device of claim 12, wherein, Each noise reduction unit (2) is distributed in a staggered manner on the carrier (1).

14. The noise reducing device of any one of claims 1 to 11, wherein, The carrier (1) is provided with a cooling structure (15).

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