CN220896432U - Noise reduction housing and power equipment - Google Patents

Abstract

The application provides a noise reduction shell cover which is used for being covered on a prime motor of power equipment and comprises a protective layer, a reflecting layer and a first sound absorption layer, wherein the protective layer, the reflecting layer and the first sound absorption layer are sequentially arranged in a stacked mode along a first direction, the first sound absorption layer is arranged closer to the prime motor than the protective layer, the first sound absorption layer comprises a body layer and a plurality of first bulges arranged on the surface of the body layer, and the first bulges are arranged to protrude away from the reflecting layer. When the prime mover of the power equipment works, part of noise generated by the prime mover is absorbed by the first sound-absorbing layer of the noise-reducing housing provided by the application, and then part of noise is reflected to the first sound-absorbing layer through the reflecting layer and is absorbed by the first sound-absorbing layer again, so that the noise of the power equipment is reduced. The noise reduction housing cover has a simple structure, can be directly arranged on a prime motor of power equipment, and is beneficial to reducing the volume and the weight of the power equipment. The application also provides power equipment.

Description

Noise reduction shell cover and power equipment

Technical Field

The application relates to the technical field of noise reduction, in particular to a noise reduction shell cover and power equipment.

Background

Power plants (e.g., generators) that are common in life produce loud noise when operated. Noise generated by the generator can interfere with the surrounding environment, causing discomfort to the person. Therefore, the generator is generally placed in a sound-proof box as a whole for noise reduction. However, the above technical solution has the problems of higher cost and heavier overall generator.

Disclosure of utility model

In view of the above, the present application provides a noise reduction housing and a power apparatus having the same, which solve the above problems.

The application provides a noise reduction housing which is used for housing a prime motor of power equipment and comprises a protective layer, a reflecting layer and a first sound absorption layer, wherein the protective layer, the reflecting layer and the first sound absorption layer are sequentially stacked along a first direction, the reflecting layer is arranged between the protective layer and the first sound absorption layer, the first sound absorption layer is configured to be closer to the prime motor than the protective layer, the first sound absorption layer comprises a body layer and a plurality of first bulges arranged on the surface of the body layer, and the plurality of first bulges are configured to protrude back to the reflecting layer.

The noise reduction housing comprises a protective layer, a reflecting layer and a first sound absorption layer which are sequentially stacked, wherein the first sound absorption layer is closer to a prime motor of power equipment than the protective layer. When the prime mover works, noise generated by the prime mover is firstly absorbed and reduced by the first sound absorption layer, the noise passing through the first sound absorption layer is reflected to the first sound absorption layer by the reflecting layer and is absorbed and weakened by the first sound absorption layer, the noise transmitted through the protective layer is obviously reduced, and the noise of the power equipment is reduced. In the above-mentioned scheme, the surface of body layer is equipped with a plurality of first archs in the first sound absorbing layer, and a plurality of first archs are outstanding back to the reflection stratum, and a plurality of first archs not only can increase the surface area that first sound absorbing layer faces the prime mover, and noise sound wave can also circle round the reflection between a plurality of first archs in addition, is absorbed by a plurality of first archs in the reflection process of circling round of noise sound wave and weakens to the absorption of noise sound wave is increased to the better first sound absorbing layer, thereby improves the effect of making an uproar of falling. The noise reduction housing cover provided by the application has a simple structure, can be directly arranged on a prime mover of power equipment, and is beneficial to reducing the volume and weight of the power equipment.

In some possible embodiments, a plurality of peaks are provided on each first protrusion.

Through the technical scheme, the arrangement of the convex peaks can better improve the surface area of the first convex surface, so that the first sound-absorbing layer can absorb more noise waves, and the noise reduction effect of the first sound-absorbing layer is improved.

In some possible embodiments, the plurality of first protrusions are wavy along a contour line of a cross section parallel to the first direction.

Through the technical scheme, a plurality of adjacent first bulges are connected through the cambered surface, so that the surface of the first sound absorption layer facing the prime motor is enlarged, and the effect of the first sound absorption layer on absorbing noise is improved. The first direction is the direction from the protective layer to the first sound absorbing layer.

In some possible embodiments, each first protrusion is arc-shaped or tapered along a contour line of a cross section parallel to the first direction.

Through the technical scheme, the first bulges with the arc or conical profile lines of the sections have excellent sound absorption effect. The first protrusion may be a cone, such as a pyramid, or the surface of the first protrusion may be a cambered surface.

In some possible embodiments, the reflective layer is an aluminum foil layer.

Through above-mentioned technical scheme, the aluminium foil layer has better reflection to the noise, can play the effect of giving sound insulation.

In some possible embodiments, the surface of the body layer is further provided with at least one second protrusion between two adjacent first protrusions, the second protrusion being configured to protrude away from the reflective layer, and in the first direction, the height of the second protrusion protruding from the body layer is smaller or larger than the height of the first protrusion protruding from the body layer.

Through the technical scheme, the surface area of the first sound-absorbing layer facing the prime motor can be increased better, meanwhile, noise sound waves are absorbed by the first sound-absorbing layer, the number of times of continuous convolution reflection of the noise sound waves between the first bulge and the second bulge is increased by the second bulge, so that the noise sound waves are absorbed and attenuated by the first bulge and the second bulge sufficiently, and the sound-absorbing effect of the first sound-absorbing layer is improved. The first bulges and the second bulges are arranged in a staggered mode so as to absorb more noise waves. The shape of the first protrusion and the second protrusion may be the same or different.

In some possible embodiments, the noise reduction shell further comprises a plurality of second sound absorbing layers disposed between the protective layer and the first sound absorbing layer.

Through the technical scheme, the sound absorption effect of the noise reduction housing can be improved. For example, a plurality of second sound-absorbing layers may be disposed between the reflection layer and the first sound-absorbing layer, and the thickness of the entire sound-absorbing layer may be increased so that more noise sound waves are absorbed. If the plurality of second sound absorbing layers are arranged between the reflecting layer and the protective layer, part of noise can be reflected to the first sound absorbing layer by part of noise when passing through the reflecting layer and absorbed again by the first sound absorbing layer, and the other part of noise is transmitted to the plurality of second sound absorbing layers by the reflecting layer and can be absorbed by the plurality of second sound absorbing layers, so that the noise transmitted to the protective layer is better reduced, and noise waves transmitted to the outside through the noise reduction housing cover when the prime motor is started or works are reduced.

In some possible embodiments, the first sound absorbing layer comprises a sound absorbing sponge layer, a rubber and plastic panel, and/or a fiberglass layer.

Through above-mentioned technical scheme, inhale sound sponge layer, rubber and plastic board or glass fiber layer and all be porous structure, porous structure can play the effect of noise absorption.

In some possible embodiments, a portion of the plurality of second sound absorbing layers is disposed between the reflective layer and the first sound absorbing layer, and another portion of the plurality of second sound absorbing layers is disposed between the reflective layer and the protective layer.

Through above-mentioned technical scheme, compare in a plurality of second sound-absorbing layers setting in the same one side of reflection stratum, all set up the second sound-absorbing layer in reflection stratum both sides, more do benefit to under the same thickness of the shell cover of making an uproar falls, improve the noise reduction effect of the shell cover of making an uproar falls as far as possible.

The application also provides power equipment, which comprises a prime motor, and further comprises a noise reduction housing cover, wherein the noise reduction housing cover is arranged on the prime motor.

The power equipment provided by the application comprises the noise reduction housing, wherein the noise reduction housing comprises the protective layer, the reflecting layer and the first sound absorption layer which are sequentially laminated, the first sound absorption layer is closer to the prime mover than the protective layer, when the prime mover works, noise generated by the prime mover works is absorbed and reduced by the first sound absorption layer, noise passing through the first sound absorption layer is reflected to the first sound absorption layer by the reflecting layer and absorbed and reduced by the first sound absorption layer, noise transmitted through the protective layer is obviously reduced, and noise reduction of the power equipment is realized. In the above-mentioned scheme, the surface of body layer is equipped with a plurality of first archs in the first sound absorbing layer, and a plurality of first archs are outstanding back to the reflection stratum, and a plurality of first archs not only can increase the surface area that first sound absorbing layer faces the prime mover, and noise sound wave can also circle round the reflection between a plurality of first archs in addition, is absorbed by a plurality of first archs in the reflection process of circling round of noise sound wave and weakens to the absorption of noise sound wave is increased to the better first sound absorbing layer, thereby improves the effect of making an uproar of falling. The noise reduction housing cover provided by the application has a simple structure, can be directly arranged on a prime mover of power equipment, and is beneficial to reducing the volume and weight of the power equipment.

Drawings

Fig. 1 is a schematic structural diagram of a power device according to the present application.

Fig. 2 is a partial exploded view of the power plant shown in fig. 1.

Fig. 3 is a schematic structural view of the noise reduction shell cover shown in fig. 2.

FIG. 4 is a schematic cross-sectional view of the edge IV-IV of the noise reduction housing turned 180 degrees in accordance with one embodiment shown in FIG. 3.

Fig. 5 is a schematic cross-sectional view of the edge IV-IV of the noise reduction housing inverted 180 degrees in another embodiment shown in fig. 3.

FIG. 6 is a schematic cross-sectional view of the edge IV-IV of the noise reduction housing inverted 180 degrees in another embodiment shown in FIG. 3.

FIG. 7 is a schematic cross-sectional view of the edge IV-IV of the noise reduction housing inverted 180 degrees in another embodiment shown in FIG. 3.

Description of the main reference signs

Noise reduction housing-100 first lobe-32 prime mover-200

Protective layer-10 peak-33 shell-300

The reflective layer-20 second bump-34 opening-310

First sound-absorbing layer-30 second sound-absorbing layer-40 first direction-S

Body layer-31 power plant-1000

The application will be better illustrated in the following detailed description in conjunction with the above-described figures 1 to 7.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Power plants (e.g., generators) that are common in life produce loud noise when operated. Noise generated by the generator can interfere with the surrounding environment, causing discomfort to the person. Therefore, the generator is generally placed in a sound-proof box as a whole for noise reduction. However, the above technical solution has the problems of higher cost and heavier overall generator.

In view of the above, the present application provides a noise reduction housing for housing a prime mover of a power plant, the noise reduction housing including a protective layer, a reflective layer, and a first sound absorbing layer stacked in this order in a first direction, the reflective layer being located between the protective layer and the first sound absorbing layer, the first sound absorbing layer being configured to be closer to the prime mover than the protective layer, the first sound absorbing layer including a body layer and a plurality of first protrusions provided on a surface of the body layer, the plurality of first protrusions being configured to protrude away from the reflective layer.

In the scheme, when the prime mover works, part of noise generated by the prime mover works is firstly absorbed and reduced by the first sound absorption layer, the noise passing through the first sound absorption layer is reflected to the first sound absorption layer by the reflecting layer and is absorbed and reduced by the first sound absorption layer, so that the noise transmitted through the protective layer is obviously reduced, and the noise of the power equipment is reduced. In the above-mentioned scheme, the surface of body layer is equipped with a plurality of first archs in the first sound absorbing layer, and a plurality of first archs are outstanding back to the reflection stratum, and a plurality of first archs not only can increase the surface area that first sound absorbing layer faces the prime mover, and noise sound wave can also circle round the reflection between a plurality of first archs in addition, is absorbed by a plurality of first archs in the reflection process of circling round of noise sound wave and weakens to the absorption of noise sound wave is increased to the better first sound absorbing layer, thereby improves the effect of making an uproar of falling. The noise reduction housing cover provided by the application has a simple structure, can be directly arranged on a prime mover of power equipment, and is beneficial to reducing the volume and weight of the power equipment.

The technical means and effects adopted to achieve the preset purpose of the present application are better described, and the present application is described in detail below with reference to the accompanying drawings and embodiments.

Referring to fig. 1 and 2, a noise reduction housing 100 and a power device 1000 are provided in an embodiment of the application. The noise reduction housing 100 is applied to the power plant 1000. In the present embodiment, the power plant 1000 may be an oil-driven generator or an electric motor, and the power plant 1000 will be described below as an example of the oil-driven generator.

Specifically, the power plant 1000 includes a prime mover 200, a housing 300, and a noise reduction enclosure 100. The casing 300 is wrapped around the prime mover 200, and the casing 300 has an opening 310. The noise reduction housing 100 covers the opening 310 of the housing 300, and noise is generated when the prime mover 200 is started and operated. The noise reduction housing 100 faces the prime mover 200, and the noise reduction housing 100 can reduce noise generated from the prime mover 200. In some embodiments, prime mover 200 may be a mechanism that generates noise during operation of a generator or the like. The outline of the housing 300 is substantially rectangular parallelepiped. The opening 310 of the housing 300 is formed at a side surface of the housing 300. The prime mover 200 is positioned within the housing 300 proximate the opening 310.

In some embodiments, the noise reduction housing 100 is a plate-like structure, and the noise reduction housing 100 is mounted at the opening 310 of the housing 300 by means of a snap connection, a bolt connection, or welding, etc. The surface area of the noise reduction housing 100 facing the prime mover 200 is larger than the surface area of the prime mover 200 exposed to the opening 310, so that the noise reduction housing 100 can reduce noise on the side of the entire prime mover 200.

In some embodiments, the noise reduction enclosure 100 and the housing 300 form a sealed cavity, which may better reduce noise from escaping through the junction of the noise reduction enclosure 100 and the housing 300, facilitating improved noise reduction to the power plant 1000. In some embodiments, the noise reduction housing 100 and the shell 300 are bolted together to facilitate subsequent repair by removing the noise reduction housing 100.

In some embodiments, a portion of the housing 300 near the prime mover 200 may also be provided to have a similar structure to the noise reduction housing 100, that is, the portion of the housing 300 covering the prime mover 200 also has a noise reduction effect, thereby better improving the noise reduction effect. In some embodiments, the overall housing 300 and noise reduction enclosure 100 are identical in construction, i.e., the entire housing 300 of the prime mover has a noise reduction effect.

Referring to fig. 2, 3, 4 and 5, the noise reduction housing 100 includes a protective layer 10, a reflective layer 20 and a first sound absorbing layer 30 stacked in this order along a first direction (S in fig. 3), i.e. the reflective layer 20 is located between the protective layer 10 and the first sound absorbing layer 30, and the first sound absorbing layer 30 is closer to the prime mover 200 than the protective layer 10. The first sound absorbing layer 30 includes a body layer 31 and a plurality of first protrusions 32 disposed on a surface of the body layer 31, where the plurality of first protrusions 32 protrude from the reflective layer 20. When the prime mover 200 is started or operated, noise generated by the prime mover 200 is absorbed and reduced by the first sound absorbing layer 30 adjacent to the prime mover 200, and noise passing through the first sound absorbing layer 30 is reflected to the first sound absorbing layer 30 by the reflecting layer 20 and absorbed and reduced by the first sound absorbing layer 30, so that noise transmitted through the protective layer 10 is significantly reduced, and noise reduction of the power equipment 1000 is realized. The first direction S is a direction in which the noise reduction housing 100 points toward the prime mover 200 in the thickness direction of the noise reduction housing 100. The direction of the cover sheet 10 to the first sound absorbing layer 30 coincides with the first direction S.

In the above-mentioned scheme, the surface of the body layer 31 in the first sound-absorbing layer 30 is provided with the plurality of first protrusions 32, and the plurality of first protrusions 32 not only can increase the surface area of the first sound-absorbing layer 30 facing the prime mover 200, but also can convolutionally reflect the noise sound wave between the plurality of first protrusions 32, and in the convolutionally reflecting process of the noise sound wave, the noise sound wave is continuously absorbed and weakened by the plurality of first protrusions 32, so as to better increase the absorption of the first sound-absorbing layer 30 to the noise sound wave, thereby improving the noise reduction effect. The noise reduction housing 100 provided by the application has a simple structure, can be directly installed on the prime mover 200 of the power equipment 1000, and is beneficial to reducing the volume and weight of the power equipment 1000.

In some embodiments, the protective layer 10 may be made of plastic or metal, so that the entire noise reduction housing 100 has a certain mechanical strength, and also plays a role in supporting the reflective layer 20 and the first sound absorbing layer 30, so as to ensure the stability of the structural strength of the entire noise reduction housing 100.

In some embodiments, the thicknesses of the protective layer 10, the reflective layer 20, and the first sound absorbing layer 30 may be set according to actual requirements. The protective layer 10, the reflective layer 20 and the first sound absorbing layer 30 are sequentially stacked, and adjacent layers can be bonded together by curing glue.

In some embodiments, the first protrusions 32 are arranged in a matrix on the surface of the body layer 31, and the first protrusions 32 are distributed over the entire body layer 31. In some embodiments, the adjacent first protrusions 32 may be disposed at intervals, and the number of the first protrusions 32 on the surface of the body layer 31, the size of each first protrusion 32, the spacing between the adjacent first protrusions 32, and the density of the first protrusions 32 disposed on the surface of the entire body layer 31 may be set according to practical requirements.

Referring to fig. 2 and 5, in some embodiments, the plurality of first protrusions 32 are wavy along a contour line of a cross section parallel to the first direction S, and the plurality of adjacent first protrusions 32 are connected with each other by an arc surface, so as to increase a surface of the first sound absorbing layer 30 facing the prime mover 200, and improve the effect of the first sound absorbing layer 30 in absorbing noise.

Referring to fig. 5, in some embodiments, each of the first protrusions 32 is arc-shaped or tapered along a contour line of a cross section parallel to the first direction S, and the plurality of first protrusions 32 of the above shape have an excellent sound absorbing effect. The first protrusion 32 may be a cone, such as a pyramid, or the surface of the first protrusion 32 may be an arc surface, and the entire first sound-absorbing layer 30 may be an egg-shaped structure. The surface of the first protrusion 32 is provided with multiple holes, and holes and gaps are fully distributed in the first protrusion 32, so that a large amount of sound waves can be absorbed, the sound waves are attenuated, and the sound absorption and noise reduction effects of the first sound absorption layer 30 are improved. In some embodiments, the first protrusion 32 may also have other shapes such as a cylinder or a square protruding from the body layer 31.

Referring to fig. 5, in some embodiments, each of the first protrusions 32 is provided with a plurality of peaks 33 to better increase the surface area of the surface of the first protrusion 32, and the noise wave is swirled and reflected between the plurality of peaks 33, and is gradually absorbed by the plurality of peaks 33 during the swirled and reflected process of the noise wave, so that the first sound absorbing layer 30 can absorb more noise wave, and the noise reduction effect of the first sound absorbing layer 30 is improved.

In some embodiments, the plurality of peaks 33 undulate along a contour line of a cross section parallel to the first direction S to increase a surface of first protrusion 32 facing prime mover 200 to enhance an effect of first sound absorbing layer 30 absorbing noise. In some embodiments, each of the peaks 33 is arc-shaped or tapered along the contour line of the cross section parallel to the first direction S, and the plurality of peaks 33 of the above-described shape have excellent sound absorbing effect. The peaks 33 may be pyramidal, such as pyramid-shaped, or the surface of the peaks 33 may be arcuate.

Referring to fig. 5, in some embodiments, in the first direction S, the height of the protruding peak 33 protruding from the first protrusion 32 is smaller than the height of the protruding peak 32 protruding from the body layer 31, so that the excessive height of the protruding peak 33 protruding from the first protrusion 32 can be avoided, the absorption of the noise waves by the whole first protrusion 32 is affected, and the thickness of the whole first sound absorbing layer 30 is reduced.

In some embodiments, the reflective layer 20 is an aluminum foil layer, which has a good reflection effect on noise and can play a role in sound insulation.

Referring to fig. 2 and 6, in some embodiments, the surface of the body layer 31 is further provided with at least one second protrusion 34 between two adjacent first protrusions 32, and the second protrusion 34 protrudes away from the reflective layer 20. Along the first direction S, the height of the second protrusion 34 protruding from the body layer 31 is smaller than or greater than the height of the first protrusion 32 protruding from the body layer 31, so that the surface area of the first sound absorbing layer 30 facing the prime mover 200 can be increased better, and meanwhile, the number of times of continuous convolution reflection of the noise sound wave between the first protrusion 32 and the second protrusion 34 is increased due to the arrangement of the second protrusion 34 in the process of being absorbed by the first sound absorbing layer 30, so that the noise sound wave is absorbed and attenuated by the first protrusion 32 and the second protrusion 34 sufficiently, and the sound absorbing effect of the first sound absorbing layer 30 is improved. The first plurality of protrusions 32 and the second plurality of protrusions 34 are staggered in height so as to absorb more noise waves.

Referring to fig. 2 and 7, in some embodiments, the noise reduction shell 100 further includes a plurality of second sound absorbing layers 40, and the plurality of second sound absorbing layers 40 are disposed between the protection layer 10 and the first sound absorbing layer 30, so that the sound absorbing effect of the noise reduction shell 100 can be improved. For example, a plurality of second sound-absorbing layers 40 may be disposed between the reflection layer 20 and the first sound-absorbing layer 30 so that more noise sound waves are absorbed. If the plurality of second sound absorbing layers 40 are disposed between the reflective layer 20 and the protective layer 10 (as shown in fig. 7), when the noise passes through the reflective layer 20, a part of the noise can be reflected to the first sound absorbing layer 30 and absorbed again by the first sound absorbing layer 30, and another part of the noise is transmitted to the plurality of second sound absorbing layers 40 through the reflective layer 20 and absorbed by the plurality of second sound absorbing layers 40, so that the noise transmitted to the protective layer 10 is preferably reduced, and the noise transmitted to the outside through the noise reduction housing 100 when the prime mover 200 is started or operated is reduced.

In some embodiments, a portion of the plurality of second sound-absorbing layers 40 is disposed between the reflective layer 20 and the first sound-absorbing layer 30, and another portion of the plurality of second sound-absorbing layers 40 is disposed between the reflective layer 20 and the protective layer 10. Compared with the plurality of second sound absorbing layers 40 disposed on the same side of the reflective layer 20, the second sound absorbing layers 40 disposed on both sides of the reflective layer 20 are beneficial to improving the noise reduction effect of the noise reduction housing 100 as much as possible under the same thickness of the noise reduction housing 100.

In some embodiments, the first sound absorbing layer 30 includes a sound absorbing sponge layer, a rubber and plastic plate, and/or a fiberglass layer. The second sound-absorbing layer 40 may be selected from the same or different materials as the first sound-absorbing layer 30. In some embodiments, the surface of the second sound absorbing layer 40 is planar. The sound-absorbing sponge has a porous structure, and when noise passes through the sound-absorbing sponge, the sound-absorbing sponge can be reflected back and forth repeatedly. Because the reflection of sound is energy-consuming, the sound absorbing sponge consumes most of the sound energy in the continuous reflection process, thereby effectively achieving the effect of noise reduction. Meanwhile, the sound-absorbing sponge can absorb low-frequency, medium-frequency and high-frequency noise. The rubber-plastic plate is also of a porous structure, and a plurality of tiny holes and holes connected inside and outside are formed in the rubber-plastic plate, so that the rubber-plastic plate has an excellent sound absorption effect. The glass fiber layer is also a porous structure, noise can rebound among gaps or cavities in the porous structure to generate friction with materials, so that the noise is converted into heat energy to be consumed, and the effect of attenuating sound waves is achieved. The glass fiber layer has numerous tiny pores and can absorb external noise.

In some embodiments, the first sound absorbing layer 30 may be one of a sound absorbing sponge layer, a rubber-plastic plate, or a fiberglass layer. The above three structures can be used as sound absorbing layers, and when in use, the structure of the material with better quality can be determined and selected as the sound absorbing layer according to the size of noise wave generated by the operation of the prime motor 200.

In some embodiments, the first sound absorbing layer 30 is secured together by any two of a sound absorbing sponge layer, a rubber plastic plate, or a fiberglass layer, in any order. For example, the first sound absorbing layer 30 formed by laminating the sound absorbing sponge layer and the glass fiber layer can absorb and cut down noise sound waves through the sound absorbing sponge layer in the process of being absorbed by the first sound absorbing layer 30, and then rebound among the holes in the glass fiber layer, so that the noise sound waves can be absorbed by two structures made of different materials, the noise sound waves with different frequencies can be absorbed by different materials, and the noise sound wave attenuation degree can be improved through the arrangement. In some embodiments, the first sound absorbing layer 30 or the three sound absorbing sponge layers, the rubber plastic plate and the glass fiber layer are stacked in any order, so that the noise sound waves sequentially pass through the sound absorbing layers made of the three different materials, and the sound absorbing layers made of the three materials can fully absorb the noise sound waves with different frequencies so as to fully reduce the noise sound waves transmitted through the protective layer 10.

The noise reduction housing 100 in the present application includes a cover layer 10, a reflection layer 20, and a first sound absorbing layer 30, which are sequentially stacked, and the first sound absorbing layer 30 is closer to a prime mover 200 of the power plant 1000 than the cover layer 10. When the prime mover 200 of the power equipment 1000 works, noise generated by the prime mover 200 is absorbed and reduced by the first sound absorbing layer 30, noise passing through the first sound absorbing layer 30 is reflected to the first sound absorbing layer 30 by the reflecting layer 20 and absorbed and reduced by the first sound absorbing layer 30, noise transmitted through the protective layer 10 is remarkably reduced, and noise reduction of the power equipment 1000 is realized. In the above-mentioned scheme, the surface of the body layer 31 in the first sound absorbing layer 30 is provided with a plurality of first protrusions 32, and the plurality of first protrusions 32 protrude away from the reflective layer 20, so that the surface area of the first sound absorbing layer 30 facing the prime mover 200 can be increased by the plurality of first protrusions 32, and the noise sound wave can be swirled and reflected between the plurality of first protrusions 32, and is absorbed and weakened by the plurality of first protrusions 32 in the swirled and reflected process of the noise sound wave, so that the absorption of the first sound absorbing layer 30 to the noise sound wave is better increased, and the noise reduction effect is improved. The noise reduction housing 100 provided by the application has a simple structure, can be directly installed on the prime mover 200 of the power equipment 1000, and is beneficial to reducing the volume and weight of the power equipment 1000.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.

Claims (9)

1. The noise reduction housing is used for covering a prime motor of power equipment and is characterized by comprising a protection layer, a reflecting layer and a first sound absorption layer which are sequentially stacked along a first direction, wherein the first sound absorption layer is configured to be closer to the prime motor than the protection layer, the first sound absorption layer comprises a body layer and a plurality of first bulges arranged on the surface of the body layer, the first bulges are configured to be protruded away from the reflecting layer, at least one second bulge is further arranged on the surface of the body layer between two adjacent first bulges, the second bulge is configured to be protruded away from the reflecting layer, and the second bulge is protruded away from the body layer along the first direction, and the height of the second bulge is smaller than or larger than that of the first bulge.

2. The noise-reducing shell cover of claim 1, wherein each of the first protrusions is provided with a plurality of peaks.

3. The noise-reducing shell cover of claim 1, wherein the plurality of first protrusions are wavy along a contour line of a cross section parallel to the first direction.

4. The noise-reducing shell cover of claim 1, wherein each of the first protrusions is arcuate or tapered along a contour line of a cross section parallel to the first direction.

5. The noise-reducing shell cover of claim 1, wherein the reflective layer is an aluminum foil layer.

6. The noise-reducing shell cover of any one of claims 1-5, further comprising a plurality of second sound-absorbing layers disposed between the protective layer and the first sound-absorbing layer.

7. The noise-reducing shell cover of claim 6, wherein the first sound-absorbing layer comprises a sound-absorbing sponge layer, a rubber-plastic panel, and/or a fiberglass layer.

8. The noise-reducing shell cover of claim 6, wherein a portion of the plurality of second sound-absorbing layers is disposed between the reflective layer and the first sound-absorbing layer and another portion of the plurality of second sound-absorbing layers is disposed between the reflective layer and the protective layer.

9. A power plant comprising a prime mover, wherein the power plant further comprises a noise reduction enclosure as defined in any one of claims 1 to 8, the noise reduction enclosure being housed in the prime mover.