CN118257714A - Noise reduction device, application of noise reduction device and electric appliance - Google Patents

Abstract

The application belongs to the technical field of noise control, and particularly relates to a noise reduction device, an application of the noise reduction device and an electric appliance. The noise reduction device comprises a first plate body, a noise elimination body and a second plate body, wherein the first plate body is provided with a plurality of noise elimination holes, the noise elimination body and the noise elimination holes are correspondingly arranged, the noise elimination body is connected to one side of the first plate body, the noise elimination body is provided with a noise elimination cavity, the noise elimination cavity is communicated with the corresponding noise elimination holes, the second plate body is connected to the other side of the first plate body, the second plate body is provided with adjusting holes, the adjusting holes and the noise elimination holes are correspondingly communicated, the aperture of the adjusting holes is smaller than that of the corresponding noise elimination holes, and the aperture of at least part of the adjusting holes is different. The application can realize the absorption of noise with different frequencies so as to have better noise reduction effect.

Description

Noise reduction device, application of noise reduction device and electric appliance

Technical Field

The application belongs to the technical field of noise control, and particularly relates to a noise reduction device, an application of the noise reduction device and an electric appliance.

Background

The frequency multiplication noise can be generated inevitably in the running process of machines such as compressors, and the frequency distribution is wide, and the high-frequency noise, the medium-low-frequency noise are involved.

In the related art, the absorption and isolation of noise with different frequencies are difficult at the same time, and there is room for improvement.

Disclosure of Invention

In order to solve the technical problems, the application provides a noise reduction device, an application of the noise reduction device and an electric appliance, and aims to solve the technical problem that the noise of different frequencies is difficult to absorb and isolate simultaneously in the related art to a certain extent.

The technical scheme of the application is as follows:

in one aspect, the present application provides a noise reduction apparatus, including:

The first plate body is provided with a plurality of silencing holes;

The silencing body is correspondingly arranged with the silencing hole, and is connected to one side of the first plate body, and is provided with a silencing cavity which is communicated with the corresponding silencing hole;

The second plate body is connected to the other side of the first plate body, an adjusting hole is formed in the second plate body and is correspondingly communicated with the silencing hole, the aperture of the adjusting hole is smaller than that of the silencing hole, and at least part of the adjusting holes are different in aperture.

The application provides a noise reduction device, which comprises a first plate body, a noise elimination body and a second plate body, wherein the noise elimination body is provided with a noise elimination cavity, and a regulating hole on the second plate body is communicated with a corresponding noise elimination cavity through a noise elimination hole on the first plate body, so that a Helmholtz resonant cavity is formed to eliminate noise. Because the silencing body and the adjusting holes are correspondingly provided with a plurality of silencing bodies, and the aperture of at least part of the adjusting holes is different, the noise of different frequencies can be absorbed by setting the aperture specification of the adjusting holes, so that a better noise reduction effect is achieved.

In some embodiments, the sound-deadening chamber is open toward an end of the first plate body, the opening and the corresponding sound-deadening hole communicate, and the opening and the corresponding sound-deadening hole have a uniform pore diameter.

In some embodiments, each of the sound-deadening holes is circular, and the sound-deadening cavity and the corresponding sound-deadening hole are coaxially arranged, so that the sound-deadening cavity has a symmetrical structure, stress concentration is avoided, noise absorption is affected, and processing is facilitated.

In some embodiments, the sound attenuation holes are one or a mixture of two or more of triangular, circular, oblong, rectangular or polygonal.

In some embodiments, the first plate body and the sound attenuating body are integrally formed.

In some embodiments, the first plate body is a flat plate, and the muffler body is formed by stamping the flat plate, so as to reduce production and manufacturing costs.

In some embodiments, the aperture of each of the tuning holes is non-uniform, or, alternatively, portions of the tuning holes are uniform to accommodate the absorption of noise at different frequencies.

In some embodiments, a buffer member is disposed between the first plate body and the second plate body, a transition hole is disposed on the buffer member, and the adjusting hole and the corresponding sound damping hole are communicated through the transition hole.

In some embodiments, the transition aperture and the adjustment aperture are of the same pore size, and the adjustment aperture and the corresponding sound attenuation aperture are in communication through one of the transition apertures.

In some embodiments, the transition hole has a smaller pore diameter than the adjustment hole, and the adjustment hole and the corresponding sound attenuation hole are in communication through two or more transition holes.

On the other hand, the application also provides application of the noise reduction device, which is applied to noise reduction of an electric appliance so as to adapt to absorption of noise with different frequencies generated by the work of the electric appliance, thereby reducing the noise of the electric appliance during the work and improving the use experience.

The application also provides an electric appliance, which comprises a shell, a compressor and the noise reduction device, wherein the compressor is arranged in the shell, the noise reduction device is arranged on the shell, and the adjusting hole of the noise reduction device faces the inside of the shell.

The noise reducing device can absorb noise of different frequencies generated during the operation of the compressor, so that the noise during the operation of an electric appliance is reduced, and the use experience is improved.

In some embodiments, the motor is an air conditioner, dryer, or refrigerator.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

In the accompanying drawings:

FIG. 1 is a schematic diagram of a noise reduction device according to an embodiment of the present application,

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic view of an assembly of the first plate body and the muffler body of FIG. 1;

FIG. 4 is a schematic view of the structure of FIG. 3 from another perspective;

FIG. 5 is a schematic illustration of the sound transmission loss of a structure of a first plate and muffler;

FIG. 6 is a schematic structural view of the second plate in FIG. 1;

FIG. 7 is a schematic diagram of an exploded construction of a noise reducer with a bumper;

FIG. 8 is a schematic view of the cushioning member of FIG. 7;

FIG. 9 is a graph of the sound absorption effect of the noise reducer of FIG. 1 employed in some embodiments;

Fig. 10 is a partial schematic view of the noise reducer of fig. 1.

Reference numerals:

the first plate body-100, the monomer-101 and the sound elimination hole-102;

the muffler comprises a muffler body-200, a muffler cavity-201 and an opening-202;

a second plate body-300, an adjusting hole-301;

A buffer member-400, a transition hole-401;

A shell-500;

Compressor-600.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that all the directional indicators in the embodiments of the present application are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

The application is described below with reference to specific embodiments in conjunction with the accompanying drawings:

The electric equipment with the compressor inevitably generates frequency multiplication noise in the operation process, has wide frequency distribution and relates to high-frequency noise, medium-low-frequency noise. For high-frequency noise, the traditional sound absorption and insulation mode can be adopted to effectively reduce noise. For medium-low frequency noise, the conventional material has difficulty in effectively absorbing or isolating noise due to its long wavelength, which is in the order of meters. Accordingly, there is a strong need in the industry for a structure or material that absorbs or isolates low and medium frequency noise to simultaneously absorb and isolate noise at different frequencies.

Based on the technical problems, the embodiment of the application provides a noise reduction device, application of the noise reduction device and an electric appliance, and aims to solve the technical problem that noise with different frequencies is difficult to absorb and isolate at the same time in the related art to a certain extent.

Fig. 1 is a schematic structural diagram of a noise reduction device according to an embodiment of the present application, and fig. 2 is an exploded schematic diagram of fig. 1. Referring to fig. 1 and fig. 2, the noise reduction device provided by the embodiment of the application includes a first plate body 100, a noise reduction body 200 and a second plate body 300, where the first plate body 100 is provided with a plurality of noise reduction holes 102, the noise reduction body 200 and the noise reduction holes 102 are correspondingly arranged, the noise reduction body 200 is connected to one side of the first plate body 100, the noise reduction body 200 is provided with a noise reduction cavity 201, the noise reduction cavity 201 is communicated with the corresponding noise reduction hole 102, the second plate body 300 is connected to the other side of the first plate body 100, the second plate body 300 is provided with an adjusting hole 301, the adjusting hole 301 and the noise reduction hole 102 are correspondingly communicated, the aperture of the adjusting hole 301 is smaller than that of the corresponding noise reduction hole 102, and at least part of the apertures of the adjusting holes 301 are different.

The noise reduction device provided by the embodiment of the application comprises a first plate body 100, a noise reduction body 200 and a second plate body 300, wherein the noise reduction body 200 is provided with a noise reduction cavity 201, and an adjusting hole 301 on the second plate body 300 is communicated with the corresponding noise reduction cavity 201 through a noise reduction hole 102 on the first plate body 100, so that a Helmholtz resonant cavity is formed for eliminating noise. Because the muffler 200 and the adjusting holes 301 are correspondingly provided with a plurality of adjusting holes 301, and at least part of the adjusting holes 301 have different aperture specifications, the noise of different frequencies can be absorbed by setting the aperture specifications of the adjusting holes 301, so that a better noise reduction effect is achieved.

Fig. 3 is an assembled schematic view of the first plate body and the muffler body in fig. 1, and fig. 4 is a schematic view of another view of fig. 3. Referring to fig. 3 and fig. 4, the first plate body 100 may be formed by combining a plurality of units 101, each unit 101 may be in a regular hexagon shape, and the units 101 may be integrally formed or welded.

In other embodiments, the single body 101 may be triangular, rectangular, or the like, which is not limited herein.

Referring to fig. 3 and 4, each of the silencing bodies 200 may be cylindrical as a whole, each of the silencing bodies 200 and the single bodies 101 are disposed in one-to-one correspondence, and the silencing cavity 201 of each of the silencing bodies 200 faces the end opening 202 of the first plate 100, the opening 202 is communicated with the corresponding silencing hole 102, and the apertures of the opening 202 and the corresponding silencing hole 102 are consistent, so that noise blocking of noise sucked through the adjusting hole 301 of the second plate 300 is avoided, and the noise absorbing capacity is improved.

With reference to fig. 3 and fig. 4, each of the sound-deadening holes 102 may be circular, and the sound-deadening cavities 201 are coaxially disposed with the corresponding sound-deadening hole 102, so that the sound-deadening cavities 201 are symmetrical, to avoid stress concentration, influence the noise absorption, and facilitate the processing.

In other embodiments, the sound attenuation holes 102 may also be one or a mixture of two or more of triangular, circular, oblong, rectangular, or polygonal. The mixing of two or more types of sound deadening holes 102 means: the partial sound-deadening holes 102 are one of triangle, circle, waist-circle, rectangle or polygon, and the other partial sound-deadening holes 102 are another one of triangle, circle, waist-circle, rectangle or polygon, etc., without limitation.

Also, the cross section of the muffler body 200 may be in a shape consistent with the corresponding muffler hole 102 or in a shape inconsistent with the corresponding muffler hole 102, for example, the cross section of the muffler body 200 may be circular, and the corresponding muffler hole 102 may be in a oval shape. It should be noted that, no matter how the cross sections of the sound deadening holes 102 and the sound deadening body 200 are, the geometric centers of the sound deadening cavities 201 and the corresponding sound deadening holes 102 are preferably coaxially arranged, so that the sound deadening cavities 201 are symmetrical as much as possible, so as to avoid stress concentration, influence the absorption of noise, and facilitate the processing.

The first plate 100 and the muffler 200 according to the embodiment of the present application are preferably integrally formed, so that the connection between them has sufficient strength and reliability to improve the reliability in use.

The materials of the Helmholtz resonant cavity in the related technology are mostly plastic structures, aging can occur after long-time use, and the 3D printing technology is adopted, so that the processing cost is high. Based on this, the first plate body 100 of the embodiment of the present application may be a flat plate, which may be a steel plate, and the muffler body 200 is formed by flat plate punching. Because the muffler 200 is formed by stamping a steel plate, the processing cost can be reduced, and in addition, the muffler 200 with a rigid structure has good durability, structural stability and rigidity, so as to improve the sound insulation amount for low frequency (less than 500 Hz), have better sound insulation effect, and can improve the sound insulation amount for low frequency.

In practical implementation, each unit 101 may be correspondingly stamped to form a muffler body 200, and then the units 101 are combined and spliced, or a plurality of muffler bodies 200 are stamped by an integral steel plate, which is not limited herein.

In some embodiments, the depth of the sound-damping cavity 201 is 1mm-5mm, so as to prevent the deep stamping depth of the steel plate from being too deep, which may result in insufficient material of the steel plate, and the sound-damping body 200 and/or the first plate body 100 are broken during the stamping process, which affects the reliability of the structure.

Fig. 5 is a schematic diagram of the sound transmission loss of the structure composed of the first plate body and the muffler body, as shown in fig. 5, the sound transmission loss of the structure composed of the first plate body and the muffler body is a solid line, and the law of mass is a broken line, and it can be found that the sound transmission loss of the structure is higher than that of a homogeneous plate with the same mass area density, mainly because the rigidity of the plate is improved due to the existence of the stamping part, and meanwhile, the acoustic impedance of the plate is also improved, so that the sound transmission loss of the structure is improved.

Fig. 6 is a schematic structural view of the second plate in fig. 1. Referring to fig. 6, the second plate 300 is covered on the other side of the first plate 100, and the adjusting hole 301 provided on the second plate 300 is communicated with the silencing cavity 201 of the corresponding silencing body 200, where the adjusting hole 301 is used to guide noise into the silencing cavity 201 of the corresponding silencing body 200, and in addition, the aperture specification of the adjusting hole 301 can be used to absorb noise with different frequencies, so as to have better noise reduction effect.

In the embodiment of the present application, the aperture of each adjusting hole 301 may be inconsistent, so that each silencing cavity 201 may be regarded as a helmholtz resonator, which can absorb noise with a single frequency, and may be suitable for absorbing noise with different frequencies; or the apertures of the partial adjusting holes 301 are consistent, that is, the apertures of the partial adjusting holes 301 are of the same size, and the apertures of the other partial adjusting holes 301 are of another same size, so that part of the noise-eliminating cavity 201 can absorb part of noise with the same frequency, and the other part of the noise-eliminating cavity 201 can absorb the rest of noise with the same frequency, and the division of the apertures can be set according to actual requirements without limitation.

In the embodiment of the present application, the adjusting hole 301 is preferably disposed with the same geometric center as the corresponding sound-damping cavity 201 of the sound-damping body 200, for example: in the case that the cross section of the muffling cavity 201 of the muffling body 200 is circular, the adjusting hole 301 and the muffling cavity 201 of the corresponding muffling body 200 are concentrically arranged, and as described above, the purpose of this arrangement is to make the structure be a symmetrical structure, so as to avoid stress concentration, influence the absorption of noise, and facilitate the processing.

In the embodiment of the application, the first plate body 100 and the second plate body 300 may be welded or bolted, and when welding is adopted, only the periphery of the first plate body 100 and the second plate body 300 or the middle of the first plate body 100 and the second plate body 300 may be partially welded, and when bolting is adopted, only the periphery of the first plate body 100 and the second plate body 300 or the middle of the first plate body 100 and the second plate body 300 may be partially bolted, so as to improve the processing efficiency.

Fig. 7 is an exploded view of a noise reduction device having a buffer, and fig. 8 is a view of the buffer of fig. 7. The first plate 100 and the second plate 300 may be mounted in such a manner that a gap exists between the first plate 100 and the second plate 300, and in a practical application process, sound may enter the gap between the first plate 100 and the second plate 300 during the propagation process of the sound introduced into the sound-deadening chamber 201, thereby generating additional impact sound. Referring to fig. 6 and 7, based on the above-mentioned problems, a buffer member 400 may be disposed between the first plate body 100 and the second plate body 300, the buffer member 400 may be a damping patch or rubber, a transition hole 401 is disposed on the buffer member 400, and the adjusting hole 301 and the corresponding sound damping hole 102 are communicated through the transition hole 401, so as to improve the sealing effect of the first plate body 100 and the second plate body 300, and prevent sound from entering between the first plate body 100 and the second plate body 300, so as to improve the noise reduction effect.

In actual assembly, the buffer member 400 may be laid on the first plate body 100, then the second plate body 300 is placed on the buffer member 400, and finally the buffer member 400 is fixed between the first plate body 100 and the second plate body 300 by welding or bolting.

The transition hole 401 in the embodiment of the present application may be identical to the aperture of the adjusting hole 301, and the adjusting hole 301 and the corresponding sound-deadening hole 102 are communicated through one transition hole 401. In other embodiments, the aperture of the transition hole 401 may be smaller than that of the adjustment hole 301, and the adjustment hole 301 and the corresponding sound attenuation hole 102 are communicated through more than two transition holes 401, and the specific setting mode may be adjusted accordingly according to the actual requirement, which is not limited herein.

Fig. 9 is a diagram showing the sound absorption effect of the noise reduction device shown in fig. 1, where it can be seen from fig. 9 that the sound absorption effect of the wide frequency band 500-700Hz (medium-high frequency) can be achieved under the combined working condition that the radius of the adjusting hole 301 is 0.5-0.9mm, so as to achieve the absorption and noise reduction of sound waves with different frequencies.

Based on the noise reduction device, the embodiment of the application also provides application of the noise reduction device, and the noise reduction device is applied to noise reduction of an electric appliance so as to adapt to absorption of noise with different frequencies generated by the work of the electric appliance, thereby reducing the noise of the electric appliance during the work and improving the use experience.

Based on the card noise reduction device, the embodiment of the application also provides an electric appliance. Fig. 10 is a partial schematic view of the noise reducer shown in fig. 1, and in combination with fig. 10, the electrical appliance includes a housing 500, a compressor 600, and the noise reducer, wherein the compressor 600 is disposed in the housing 500, the noise reducer is disposed on the housing 500, and the adjusting hole 301 of the noise reducer faces the interior of the housing 500. The noise reducing device can absorb noise of different frequencies generated during the operation of the compressor, so that the noise during the operation of an electric appliance is reduced, and the use experience is improved.

The housing 500 may be provided with one or more noise reducing devices according to actual needs, and the noise reducing devices may be assembled inside the housing 500 by means of installation during actual assembly, or the noise reducing devices may be integrated on the housing, i.e. a part of the housing is a noise reducing device, which is not limited herein.

The electric appliance shown in the embodiment of the present application may be a motor having a compressor to operate, such as an air conditioner, a clothes dryer, or a refrigerator, etc., and is not limited thereto.

The noise reduction device may be applied to an electric appliance having no compressor, for example, an electric appliance having a stirring function, and the like, and is not limited thereto.

In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

In the description of the present application, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 the present application. In this specification, schematic representations of the above terms are not necessarily directed 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. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (13)

1. A noise reduction device, characterized in that the noise reduction device comprises:

The first plate body is provided with a plurality of silencing holes;

The silencing body is correspondingly arranged with the silencing hole, and is connected to one side of the first plate body, and is provided with a silencing cavity which is communicated with the corresponding silencing hole;

The second plate body is connected to the other side of the first plate body, an adjusting hole is formed in the second plate body and is correspondingly communicated with the silencing hole, the aperture of the adjusting hole is smaller than that of the silencing hole, and at least part of the adjusting holes are different in aperture.

2. The noise reduction device according to claim 1, wherein the sound attenuation chamber is open toward an end of the first plate body, the opening communicates with the corresponding sound attenuation hole, and the opening and the corresponding sound attenuation hole have a uniform aperture.

3. The noise reduction device of claim 1, wherein each of the sound attenuation holes is circular, and the sound attenuation chamber is coaxially disposed with the corresponding sound attenuation hole.

4. The noise reducing device according to claim 1, wherein the sound deadening hole is one or a mixture of two or more of a triangle, a circle, a lumbar circle, a rectangle, or a polygon.

5. The noise reducer of claim 1, wherein the first plate body and the muffler body are integrally formed.

6. The noise reduction device according to claim 5, wherein the first plate body is a flat plate, and the noise reduction body is formed by punching the flat plate.

7. The noise reduction device according to claim 1, wherein the aperture of each of the adjustment holes is not uniform, or the aperture of a part of the adjustment holes is uniform.

8. The noise reduction device according to claim 1, wherein a buffer member is provided between the first plate body and the second plate body, a transition hole is provided on the buffer member, and the adjusting hole and the corresponding noise elimination hole are communicated through the transition hole.

9. The noise reduction device of claim 8, wherein the transition hole and the adjustment hole have a uniform pore diameter, and the adjustment hole and the corresponding sound attenuation hole are communicated through one of the transition holes.

10. The noise reduction device according to claim 8, wherein the aperture of the transition hole is smaller than the aperture of the adjustment hole, and the adjustment hole and the corresponding sound attenuation hole are communicated through two or more transition holes.

11. Use of a noise reducing device according to any of claims 1-10, wherein the noise reducing device is applied to noise reduction of an electrical appliance.

12. An electrical appliance comprising a housing, a compressor and a noise reduction device according to any one of claims 1 to 10, the compressor being arranged in the housing, the noise reduction device being arranged on the housing, the adjustment aperture of the noise reduction device being oriented towards the interior of the housing.

13. The appliance of claim 12, wherein the motor is an air conditioner, dryer, or refrigerator.