CN217464899U

CN217464899U - Wall-mounted electrical apparatus and noise reduction device thereof

Info

Publication number: CN217464899U
Application number: CN202221067340.2U
Authority: CN
Inventors: 崔福浩; 唐伟鹏; 汪耀东; 李忠华
Original assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-09-20
Anticipated expiration: 2032-05-06

Abstract

The utility model relates to the technical field of electrical apparatus, a device and wall-hanging electrical apparatus of making an uproar falls of wall-hanging electrical apparatus is provided, this device of making an uproar falls of wall-hanging electrical apparatus includes: the mounting shell is internally provided with a silencing cavity and is used for being mounted on a wall; the panel, the panel install in the installation shell, just the panel be equipped with communicate to a plurality of first through-holes of amortization chamber, the panel is used for the orientation wall-hanging electrical apparatus host computer. According to the utility model discloses a device of making an uproar falls in wall-hanging electrical apparatus, through the structure in porous amortization chamber, can realize the multiple reflection of noise, consume the reflection energy that low frequency noise passes through the wall, provide quieter operational environment.

Description

Wall-mounted electrical apparatus and noise reduction device thereof

Technical Field

The utility model relates to the technical field of electrical apparatus, especially, relate to a device and wall-hanging electrical apparatus of making an uproar falls of wall-hanging electrical apparatus.

Background

Because the wall-mounted electrical appliance does not need to occupy the indoor floor space, the wall-mounted electrical appliance is applied to a plurality of products, such as a wall-mounted gas water heater, a wall-mounted dehumidifier, a wall-mounted closestool and the like. Because of factors such as pleasing to the eye, wall-hanging electrical apparatus sets up air intake or other openings at the back usually for wall-hanging electrical apparatus's noise at work can outwards propagate from this department, and through the reflection of wall again, can produce great noise, brings not good experience to the activity near wall-hanging electrical apparatus people.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a device of making an uproar falls in wall-hanging electrical apparatus can realize the multiple reflection of noise, consumes the reflection energy that low frequency noise passes through the wall.

The utility model discloses still provide a wall-hanging electrical apparatus.

According to the utility model discloses device of making an uproar falls in wall-hanging electrical apparatus of first aspect embodiment, include:

the mounting shell is internally provided with a silencing cavity and is used for being mounted on a wall;

the panel, the panel install in the installation shell, just the panel be equipped with communicate to a plurality of first through-holes of amortization chamber, the panel is used for the orientation wall-hanging electrical apparatus host computer.

According to the utility model discloses device of making an uproar falls in wall-hanging electrical apparatus, through the structure in porous amortization chamber, can realize the multiple reflection of noise, consume the reflection energy that low frequency noise passes through the wall, provide quieter operational environment.

According to the utility model discloses an embodiment, the amortization chamber is a plurality of, and is a plurality of along the perpendicular to the amortization chamber the direction of panel normal distributes, every the amortization chamber all corresponds and is linked together first through-hole.

According to the utility model discloses an embodiment, at least two the volume of amortization chamber, at least two the amortization chamber corresponds the flow cross section area and at least two of first through-hole the amortization chamber corresponds at least one kind is different in the porosity of first through-hole.

According to the utility model discloses an embodiment, it is a plurality of the amortization chamber is along the perpendicular to the direction of panel normal is the array and arranges, every the amortization chamber corresponds to have a plurality of array of arranging of being first through-hole.

According to an embodiment of the invention, at least one surface of the panel is provided with a sound absorbing layer.

According to the utility model discloses an embodiment, be equipped with in the installation shell with the panel reaches the backplate of installation shell is spaced apart at least one baffle that sets up, the baffle is used for following the direction of panel normal is separated the amortization chamber, the baffle is equipped with the second through-hole.

According to an embodiment of the invention, the mounting shell and at least one of the panels is provided with a reinforcement rib.

According to an embodiment of the utility model, the installation shell with at least one in the panel is equipped with and is used for the installation the wall-hanging electrical apparatus's the first installation department of mainframe.

According to the utility model discloses an embodiment, the installation shell is suitable for the embedding in the mounting groove of wall, the installation shell be equipped with be used for with the second installation department that the mounting groove links to each other.

According to the utility model discloses an embodiment, the amortization chamber is followed the degree of depth of the direction of panel normal is D, the thickness of panel is H, the flow cross section area of first through-hole is S, the porosity of panel is P, satisfies:

20mm≤D≤200mm，0.4mm≤H≤2mm，0.05mm2≤S≤4mm2，0.1％≤P≤2％。

according to the utility model discloses an embodiment, the installation shell is equipped with adhesive structure, adhesive structure be used for paste in the wall of wall.

According to the utility model discloses wall-hanging electrical apparatus of second aspect embodiment includes:

the back of the electrical appliance main machine is provided with an air port;

the noise reduction device as in any above, wherein the air inlet faces the panel.

According to the utility model discloses wall-hanging electrical apparatus, electrical host's noise at the time of outwards propagating through the wind gap, can be absorbed by the device of making an uproar of falling, prevents wall reflection noise, provides quieter operational environment

According to the utility model discloses an embodiment, the mainframe is in the projected area of wall is S1, the panel is in the projected area of wall is S2, the mainframe is in the projection of wall with the panel is in the projected overlapping area' S of wall area is S3, satisfies:

50％≤S2/S1≤200％，S3/S1≥50％。

the embodiment of the utility model provides an in above-mentioned one or more technical scheme, one of following technological effect has at least:

through the structure of the porous sound-deadening cavity, multiple reflections of noise can be realized, the reflected energy of low-frequency noise passing through the wall is consumed, and a quieter working environment is provided.

Furthermore, through the division of the sub-cavity, the design freedom degree of the noise reduction device is higher, a resonator aiming at various frequencies can be formed, and the noise reduction in a larger frequency range is realized.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view illustrating a noise reduction device of a wall-mounted electrical appliance according to an embodiment of the present invention engaged with a wall surface;

fig. 2 is a schematic structural diagram of a noise reduction device for a wall-mounted electrical appliance according to an embodiment of the present invention;

fig. 3 is a second schematic structural diagram of a noise reduction device for a wall-mounted electrical appliance according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating noise transmission from a wall-mounted electrical appliance according to an embodiment of the present invention;

fig. 5 is a second schematic diagram of noise transmission from a wall-mounted electrical appliance according to an embodiment of the present invention;

fig. 6 is a schematic projection diagram of an electrical host and a noise reduction device in a wall-mounted electrical appliance according to an embodiment of the present invention.

Reference numerals:

the noise reduction device 100, the mounting shell 110, the silencing cavity 111, the panel 120, the first through hole 121, the partition 130, the electrical main unit 200 and the wall 300.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

A noise reduction device 100 for a wall-mounted electric appliance according to an embodiment of the present invention is described below with reference to fig. 1 to 5.

As shown in fig. 4 and 5, the noise reduction device 100 of the embodiment of the present invention is suitable for being installed at the rear of the main electrical appliance 200 of a wall-mounted electrical appliance, for absorbing the backward-propagating operating noise of the main electrical appliance 200, and reducing the operating noise reflected to everywhere indoors through the wall.

As shown in fig. 1 to 3, the noise reduction apparatus 100 of the wall-mounted appliance includes: the case 110 and the panel 120 are installed.

The sound attenuation cavity 111 is formed in the mounting shell 110, the mounting shell 110 may be a box-shaped structure with an open front end, and the specific shape of the mounting shell 110 may be determined according to the shape of the electrical host 200, for example, the mounting shell 110 in fig. 1 to 3 is a rectangular box-shaped structure adapted to the electrical host 200 with a rectangular back surface, or when the electrical host 200 is circular, the mounting shell 110 may be a cylindrical box-shaped structure.

The front end of the mounting case 110 is open.

For example, for a gas water heater, the mounting case 110 has a rectangular box-shaped structure; for a circular wall-mounted dryer, the mounting case 110 has a cylindrical box-like structure.

The mounting case 110 is used to be mounted on the wall 300, the mounting case 110 may be mounted on the wall 300 in various ways, in the embodiment shown in fig. 4, the wall 300 is provided with a mounting groove, the mounting case 110 is embedded into the mounting groove, the bottom wall of the mounting case 110 may be supported on the mounting groove, and the back plate or the side plate of the mounting case 110 may be connected with the wall surface of the mounting groove by means of glue, a threaded connection member, a rivet, or the like.

The mounting case 110 may be made of plastic, resin, metal plate, or ceramic, or the mounting case 110 may be made of a composite material, the inner surface of the mounting case 110 may be a non-smooth surface to enhance the sound absorption effect, and the inner surface of the mounting case 110 may be coated with a sound attenuation coating.

As shown in fig. 1 to 3, the panel 120 is mounted to the mounting case 110, the panel 120 is mounted to the front end of the mounting case 110, and the panel 120 can be connected to the mounting case 110 by various means, such as gluing, screwing, riveting, and snapping.

An acoustic insulator pad may be interposed between the panel 120 and the mounting case 110 to prevent noise from being transmitted outward from a gap between the panel 120 and the mounting case 110.

When the noise reduction device 100 is mounted in a state of being fitted to the main electric appliance 200, the panel 120 faces the back surface of the main electric appliance 200.

As shown in fig. 1 and 3, the panel 120 is provided with a plurality of first through holes 121, the first through holes 121 are communicated to the sound-deadening chamber 111, and the sound-deadening chamber 111 is communicated with the outside through the first through holes 121.

The first through hole 121 may have a circular, triangular, or square shape.

The panel 120 may be made of plastic, resin, or sheet metal, or the panel 120 may be made of a composite material.

In some embodiments, at least one surface of the panel 120 is provided with a sound absorbing layer. The sound absorbing layer may be made of sound attenuating materials, including but not limited to: foam, sponge, porous coating, which enhances the absorption of high frequency noise by the noise reducer 100.

When the wall-mounted electrical appliance works, the electrical appliance host 200 can generate working noise, particularly, air openings are formed in the rear ends of some electrical appliance hosts 200, the working noise inside the electrical appliance host 200 can be outwards transmitted through the air openings, when the working noise is transmitted backwards, the working noise can be transmitted to the silencing cavity 111 through the first through hole 121, and the noise energy is consumed through multiple reflection in the silencing cavity 111.

For example to the low frequency noise that gas heater during operation produced, sound absorbing material such as soundproof cotton in the correlation technique all is difficult to effectively, the utility model discloses the device 100 of making an uproar of falling passes through the first through-hole 121 of amortization chamber 111 cooperation, can absorb low frequency noise, if other structures of recombination absorb medium-high frequency noise, then can realize falling the noise relatively well.

According to the utility model discloses device 100 of making an uproar falls of wall-hanging electrical apparatus, through the structure in porous amortization chamber 111, can realize the multiple reflection of noise, the energy of low frequency noise in the reflection consumption through the wall provides quieter operational environment.

In some embodiments, the sound-deadening chamber 111 is multiple, the multiple sound-deadening chambers 111 are distributed along a direction perpendicular to the normal of the panel 120, and each sound-deadening chamber 111 corresponds to the first through hole 121 communicated with each other.

The sound-deadening chambers 111 may be distributed at intervals, and adjacent sound-deadening chambers 111 are physically separated by a wall in the installation case 110.

Each sound-deadening chamber 111 may have a rectangular parallelepiped shape, or a spherical shape, or a hexagonal prism, or a triangular pyramid, or other shapes, and the region of the mounting case 110 where no sound-deadening chamber 111 is provided may have a thin-walled structure, so as to reduce the weight of the noise reducer 100.

Thus, under the condition that the volume of the noise reduction device 100 is fixed, the volume of the sound attenuation cavity 111 is smaller, noise can be reflected on the inner wall of the sound attenuation cavity 111 more times, and noise in each area can be transmitted into the sound attenuation cavity 111 through the corresponding first through hole 121, so that the noise reduction effect is better.

In some embodiments, at least one of the volume of the at least two sound-attenuating cavities 111, the flow cross-section of the first through-holes 121 corresponding to the at least two sound-attenuating cavities 111, and the porosity of the first through-holes 121 corresponding to the at least two sound-attenuating cavities 111 is different.

In other words, there are at least two sound-deadening chambers 111 which differ in at least one of the parameters of the three following: the volume of the sound attenuation cavity 111, the flow cross-sectional area of the first through holes 121 and the density of the first through holes 121 corresponding to the sound attenuation cavity 111 can be used for specifically attenuating noise of various frequencies of wall-mounted electrical appliances.

For example, combustion noise, water flow noise and mechanical noise of the gas water heater have different frequency characteristics, and in corresponding areas behind a burner, a heat exchanger and a fan system, a silencing cavity 111 and a first through hole 121 with different parameters are respectively designed to carry out targeted silencing.

In some embodiments, the volume of the sound-deadening chamber 111 facing the combustor and the heat exchanger is greater than the volume of the sound-deadening chamber 111 facing the fan system.

The inventor finds that the noise sources for the normal operation of the gas water heater include: combustion noise, fan noise, gas injection noise, mechanical vibration noise, water flow noise, and the like. The combustion noise has obvious low frequency characteristic, and the penetrability is strong, and fan and water pump noise have obvious high frequency characteristic, and sharp-pointed harsh, the sense of hearing is felt poorly.

By designing the volume of the sound-deadening chamber 111 towards the burner and the heat exchanger to be larger, the low-frequency noise can be better absorbed.

In some embodiments, the number of first through holes 121 corresponding to the sound-deadening chamber 111 facing the burner and the heat exchanger is less than the number of first through holes 121 corresponding to the sound-deadening chamber 111 facing the fan system. By designing the number of the first through holes 121 corresponding to the noise reduction chamber 111 facing the blower system to be more, high frequency noise can be more effectively reduced.

In some embodiments, the plurality of sound-deadening cavities 111 are arranged in an array along a direction perpendicular to a normal of the panel 120, and each sound-deadening cavity 111 corresponds to a plurality of first through holes 121 arranged in an array. Thus, each area has a considerable number of silencing cavities 111 and first through holes 121, and multi-area silencing can be realized.

In some embodiments, a partition 130 is disposed in the mounting case 110, the partition 130 is disposed apart from the front panel 120 and the back panel of the mounting case 110, the partition 130 is used for partitioning the sound-deadening chamber 111 along a direction normal to the front panel 120, and the partition 130 is provided with a second through hole. The separator 130 may be one or more layers.

The noise reduction cavity 111 is divided into a plurality of layers along the normal direction of the panel 120, so that a plurality of sub-cavities can be formed, the design freedom of the noise reduction device 100 is higher through the division of the sub-cavities, a resonator aiming at various frequencies can be formed, and the noise reduction in a larger frequency range is realized.

In some embodiments, the mounting housing 110 may be provided with a plurality of ribs, which may be integrally formed with the mounting housing 110, and the plurality of ribs may intersect with each other, for example, the plurality of ribs may be in a grid shape, or the plurality of ribs may be arranged in parallel and spaced apart. The reinforcing ribs may enhance the strength of the mounting case 110. The reinforcing ribs may be provided on the inner wall of the mounting case 110 so as not to affect the external form, and of course, the reinforcing ribs may be provided on the outer wall.

Of course, the strength of the mounting shell 110 can also be increased by other methods, including local thickening and other processing methods.

In some embodiments, the panel 120 may be provided with a plurality of ribs, the ribs may be integrally formed with the panel 120, and the plurality of ribs may intersect with each other, for example, the plurality of ribs may be in a grid shape, or the plurality of ribs may be arranged in parallel and spaced apart. The reinforcing ribs may enhance the strength of the panel 120. The reinforcing beads may be provided on the front surface or the rear surface of the panel 120.

Of course, the strength of the panel 120 may be increased by other means, including local thickening.

In some embodiments, at least one of the mounting case 110 and the panel 120 is provided with a first mounting part for mounting the main appliance 200 of the wall-mounted electric appliance. Thus, the main electric appliance 200 may be directly mounted to the noise reducing device 100 and hung on the wall 300 through the noise reducing device 100.

Of course, the mainframe 200 of the wall-mounted electric appliance may be directly mounted to the wall 300, i.e., the mainframe 200 and the noise reduction device 100 are separately mounted, so that the mainframe 200 is more stably mounted.

The noise reduction device 100 according to the embodiment of the present invention can also be designed to be embedded and external, and the following two different structural forms are used to specifically describe the embodiment of the present invention.

One, embedded type

In this embodiment, the mounting case 110 is adapted to be inserted into a mounting groove of the wall 300, and the mounting case 110 is provided with a second mounting portion for coupling with the mounting groove.

As shown in fig. 1 and 4, the mounting housing 110 is inserted into the mounting groove, the bottom wall of the mounting housing 110 can be supported by the mounting groove, and the back plate or the side plate of the mounting housing 110 can be connected to the wall surface of the mounting groove by gluing, screwing, riveting, or the like.

In this embodiment, due to the embedded structure, the noise reducer 100 does not occupy space outside the wall, and accordingly, the noise reducer 100 can be designed to be thicker, and accordingly, the design margins of the sound-deadening chamber 111 and the panel 120 are also large.

In some embodiments, the depth of the sound-deadening chamber 111 along the direction of the normal line of the panel 120 is D, the thickness of the panel 120 is H, the flow cross-sectional area of the first through-hole 121 is S, and the porosity of the panel 120 is P, which satisfy:

20mm≤D≤200mm，0.4mm≤H≤2mm，0.05mm ² ≤S≤4mm ² ，0.1％≤P≤2％。

the specific values of the above parameters can be determined by combining the noise frequency characteristics of the main electrical appliance 200, for example, D is 100mm, H is 0.6mm, and S is 0.1mm ² And P is 0.8%, and the noise reduction device 100 has a good absorption effect on medium and low frequency noise near 400 Hz.

Two, external

In this embodiment, the mounting case 110 is provided with an adhesive structure for adhering to a wall of the wall 300. As shown in fig. 5, the back plate of the installation case 110 can be adhered to the wall, so that the installation is simpler without modifying the installation groove of the house.

In some embodiments, the depth of the sound-deadening chamber 111 along the direction of the normal line of the panel 120 is D, the thickness of the panel 120 is H, the flow cross-sectional area of the first through hole 121 is S, and the porosity of the panel 120 is P, which satisfy:

5mm≤D＜20mm，0.5mm≤H≤5mm，0.3mm ² ≤S≤10mm ² ，0.1％≤P≤2％。

the specific values of the above parameters can be determined by combining the noise frequency characteristics of the main electrical appliance 200, for example, D is 15mm, H is 2mm, and S is 3mm ² And P is 0.3%, and the noise reduction device 100 has a good absorption effect on low and medium frequency noise near 400 Hz.

The embodiment of the utility model provides a wall-hanging electrical apparatus is still provided.

As shown in fig. 4 and 5, the wall-mounted electric appliance includes an electric appliance main body 200 and a noise reduction device 100.

The back of the main electrical appliance 200 has an air inlet facing the panel 120 of the noise reducer 100.

The air inlet can be an air inlet or an air outlet.

Thus, the operation noise of the main electric appliance 200 can be absorbed by the noise reducer 100 when it is transmitted to the outside through the air outlet, preventing the wall from reflecting the noise, and providing a quieter operation environment.

The wall-mounted electrical appliance can be a gas water heater, a wall-mounted dehumidifier, a wall-mounted closestool and the like.

In some embodiments, as shown in fig. 6, the projection area of the main electrical appliance 200 on the wall 300 is S1, the projection area of the panel 120 on the wall 300 is S2, and the area of the overlapping region of the projection of the main electrical appliance 200 on the wall 300 and the projection of the panel 120 on the wall 300 is S3, which satisfies: S2/S1 is more than or equal to 50% and less than or equal to 200%, and S3/S1 is more than or equal to 50%. For example, S2/S1 is 100%, and S3/S1 is 100%.

In the actual production and installation process, the size of the noise reduction device 100 can be determined according to the actual situation of noise, so as to achieve better noise elimination and reduction effects.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

The above embodiments are merely illustrative, and not restrictive, of the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of the technical solutions should be covered by the scope of the claims of the present invention.

Claims

1. A wall-mounted appliance noise reduction device, comprising:

the mounting structure comprises a mounting shell, a first fixing piece and a second fixing piece, wherein a silencing cavity is arranged in the mounting shell, and the mounting shell is used for being mounted on a wall;

2. The wall-mounted electrical appliance noise reduction device according to claim 1, wherein the plurality of sound-deadening chambers are distributed in a direction perpendicular to a normal line of the panel, and each sound-deadening chamber corresponds to the first through hole communicated with the first through hole.

3. The wall-mounted appliance noise reduction device according to claim 2, wherein at least one of a volume of at least two of the sound-deadening chambers, a flow cross-sectional area of the first through-hole corresponding to at least two of the sound-deadening chambers, and a porosity of the first through-hole corresponding to at least two of the sound-deadening chambers is different.

4. The wall-mounted electrical appliance noise reduction device according to claim 2, wherein the plurality of sound-deadening chambers are arranged in an array in a direction perpendicular to a normal line of the panel, and each sound-deadening chamber corresponds to the plurality of first through holes arranged in an array.

5. The wall-mounted appliance noise reducer according to claim 1, wherein at least one surface of the panel is provided with a sound absorbing layer.

6. The wall-mounted electric appliance noise reduction device according to claim 1, wherein at least one partition plate is arranged in the mounting shell and is spaced from the panel and the back plate of the mounting shell, the partition plate is used for partitioning the sound attenuation cavity along the normal direction of the panel, and the partition plate is provided with a second through hole.

7. The wall-mounted appliance noise reducer according to claim 1, wherein at least one of the mounting shell and the panel is provided with a reinforcing rib.

8. The wall hanging appliance noise reduction device of any of claims 1 to 7, wherein the mounting shell is adapted to fit into a mounting slot of the wall, the mounting shell being provided with a second mounting portion for connection to the mounting slot.

9. The wall-mounted electrical appliance noise reduction device according to claim 8, wherein the noise reduction cavity has a depth D along a direction normal to the panel, the panel has a thickness H, the first through hole has a cross-sectional flow area S, and the panel has a porosity P, which satisfies:

10. the wall-mounted appliance noise reduction device according to any one of claims 1 to 7, wherein the mounting case is provided with an adhesive structure for adhering to a wall of the wall.

11. A wall-mounted appliance, comprising:

the back of the electrical appliance main machine is provided with an air port;

the noise reducing device of any of claims 1-10, the air opening being directed towards the panel.

12. The wall-mounted electric appliance according to claim 11, wherein the area of the projection of the main electric appliance on the wall is S1, the area of the projection of the panel on the wall is S2, and the area of the overlapping area of the projection of the main electric appliance on the wall and the projection of the panel on the wall is S3, so that:

50％≤S2/S1≤200％，S3/S1≥50％。