CN215441108U - Rear cover device and clothes treatment equipment - Google Patents

Abstract

The embodiment of the application provides a rear cover device and clothes treatment equipment, wherein the rear cover device comprises an inner cover and an outer cover; the inner cover is provided with an airflow channel and comprises a first side plate and a plurality of bulges protruding out of the surface of the first side plate, and the airflow channel and the bulges are positioned on two opposite sides of the first side plate; the outer cover sets up in one side that the inner cover deviates from airflow channel, and noise damping chamber is injectd to outer cover and inner cover, and each arch is located the noise damping intracavity, and the inner cover is provided with the sound absorption hole that communicates airflow channel and noise damping chamber, and at least part sound absorption hole runs through first curb plate and arch. According to the rear cover device, the first side plate serves as a perforated thin plate, air in the sound absorption hole rubs with the hole wall due to resonance, sound energy is lost, and noise radiated by the rear cover device is reduced; the protruding air column thickness that can increase in the sound absorption hole, that is to say, increase the air current at the downthehole flow path of sound absorption, promote the sound absorption effect to the low frequency composition noise.

Description

Rear cover device and clothes treatment equipment

Technical Field

The application relates to the technical field of clothes care, in particular to a back cover device and clothes treatment equipment.

Background

As the standard of living increases, the laundry treating apparatus is more and more favored as a clothes drying tool by users.

While the laundry treating apparatus provides convenience to a user, noise radiated to the surrounding environment during the drying process is a big problem to the user. Taking a clothes dryer as an example, the pneumatic noise is a main source of the noise of the clothes dryer, wherein the pneumatic noise radiated outwards by the rear cover device is large, and the noise reduction difficulty is large.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiments of the present application are expected to provide a rear cover device and a clothes treatment apparatus with better noise reduction effect.

The embodiment of the application provides a back cover device, is used for clothing processing equipment, includes:

the inner cover comprises a first side plate and a plurality of bulges protruding out of the surface of the first side plate, and the airflow channel and the bulges are positioned on two opposite sides of the first side plate;

the outer cover, the outer cover set up in the inner cover deviates from one side of airflow channel, the outer cover with the noise elimination chamber is injectd to the inner cover, each the arch is located the noise elimination intracavity, the inner cover is provided with the intercommunication airflow channel with the sound absorption hole in noise elimination chamber, at least part the sound absorption hole runs through first curb plate with the arch.

In some embodiments, the protrusion of the protrusion on the first side panel has a thickness of 2mm to 5 mm.

In some embodiments, the sound-absorbing apertures extending through the first side panel and the projections have a hole depth of 4mm to 9 mm.

In some embodiments, the sound-absorbing apertures have an equivalent diameter of 2.5mm to 10 mm.

In some embodiments, the housing is a metal piece; and/or the inner cover is made of plastic.

In some embodiments, the outer cover includes a second side plate, the first side plate and the second side plate are stacked at intervals, and the protrusion thickness of the protrusion on the first side plate is 0.1 to 0.3 times of the distance between the first side plate and the second side plate.

In some embodiments, the outer cover comprises a second side plate, the first side plate and the second side plate are stacked at intervals, and the distance between the first side plate and the second side plate is 7 mm-20 mm.

In some embodiments, the back cover apparatus includes a sound absorbing material disposed within the sound-deadening chamber.

In some embodiments, each sound absorption hole penetrates through the first side plate and the protrusion, the sound absorption material includes a sound absorption film layer, and the sound absorption film layer covers one end of each protrusion far away from the first side plate to seal each sound absorption hole.

In some embodiments, each sound-absorbing aperture extends through the first side panel and the projection, and the sound-absorbing material comprises a flexible sound-absorbing material that is in a compressed state and blocks each sound-absorbing aperture.

In some embodiments, the outer cover includes a second side panel, the first and second side panels being spaced apart in a stacked arrangement, the first and second side panels compressing the flexible sound absorbing material therebetween.

In some embodiments, the enclosure includes a second side panel, the first and second side panels being stacked in spaced relation, the rear enclosure means including a partition disposed between the first and second side panels, the partition and the first side panel compressing the flexible sound absorbing material therebetween, the partition and the second side panel forming an air interlayer therebetween.

In some embodiments, a side of the inner cover facing away from the outer cover is open, the airflow passage includes an impeller mounting area and a blowing area, the blowing area is located downstream of the impeller mounting area in a flow direction of the airflow, and the airflow passage enters air from the opening of the impeller mounting area and blows air from the opening of the blowing area.

The embodiment of the application provides a clothes treatment device, clothes treatment device has the circulation wind channel, clothes treatment device include the box, set up in section of thick bamboo dress in the box and the back shroud device of this application arbitrary embodiment, section of thick bamboo dress has the clothing treatment chamber, the air current passageway with the clothing treatment chamber all is located on the circulation wind channel.

In some embodiments, the rear side wall of the box body is provided with an air outlet and an air inlet; the rear cover device is arranged outside the box body and located on the rear side of the rear side wall of the box body, and the airflow channel is communicated with the air outlet and the air inlet.

In some embodiments, the clothing processing apparatus includes base, evaporimeter, condenser and wind wheel, the wind wheel set up in the airflow channel, the box cover is located the top of base, the evaporimeter with the condenser set up in on the base and be located on the circulation wind channel, come from the air current of clothing processing chamber flows through in proper order get into behind evaporimeter, the condenser in the airflow channel.

The rear cover device of this application embodiment, first curb plate are as a perforation sheet metal, and it forms a perforated plate sound absorbing structure with the amortization chamber behind one's back, and the air in the sound absorbing hole produces the friction and then loses the acoustic energy with the pore wall because of resonance, reduces the noise of rear cover device radiation. In addition, under the unchangeable condition of the wall thickness of inner cover, the arch of this application embodiment can increase the downthehole air column thickness of sound absorption, that is to say, increases the air current and in the downthehole flow path of sound absorption, promotes the sound absorption effect to low frequency composition noise.

Drawings

Fig. 1 is a simplified schematic view of a laundry treating apparatus according to an embodiment of the present application, wherein arrows illustrate airflow flow paths;

FIG. 2 is a schematic view of the rear cover device of the present application cooperating with the rear sidewall of the box body;

FIG. 3 is a rear view of FIG. 2;

FIG. 4 is an exploded view of the structure of FIG. 2 from another perspective;

FIG. 5 is a schematic view of the structure of FIG. 4 from another perspective;

FIG. 6 is a schematic structural diagram of a rear cover device according to an embodiment of the present application;

FIG. 7 is an enlarged view of a portion of FIG. 6 at A;

FIG. 8 is a schematic view of the structure of FIG. 6 from another perspective;

FIG. 9 is a simplified cross-sectional view of a rear housing arrangement of a first embodiment of the present application;

FIG. 10 is an enlarged partial view at B of FIG. 9;

FIG. 11 is a fragmentary schematic view of a simplified cross-sectional view of a rear housing arrangement of a second embodiment of the present application, wherein the cut-away and partially shown positions are the same as in FIG. 10;

FIG. 12 is a fragmentary schematic view of a simplified cross-sectional view of a rear housing arrangement of a third embodiment of the present application, wherein the cut-away and partially shown positions are the same as in FIG. 10;

FIG. 13 is a fragmentary schematic view of a simplified cross-sectional view of a rear housing arrangement of a fourth embodiment of the present application, wherein the cross-sectional and partially shown positions are the same as in FIG. 10;

fig. 14 is a partial schematic view of a simplified cross-sectional view of a rear cover apparatus of a second embodiment of the present application, wherein the cut-away position and partial display position are the same as in fig. 10.

Description of the reference numerals

A box body 1; an air outlet 1 a; an air inlet 1 b; a rear side wall 11; the cylinder part is arranged 2; a laundry treatment chamber 2 a; an evaporator 3; a condenser 4; a base 5; a wind wheel 6; a rear cover device 7; an inner cover 71; the airflow passage 71 a; the impeller mounting area 71 a'; the blast zone 71a "; a first side plate 711; a first shroud 712; a first flange 7121; a projection 713; sound absorbing holes 71 b; a mounting ear 714; a housing 72; a second side plate 721; a second web 722; a second flange 7221; a sound absorbing material 73; a sound-deadening chamber 7 a; partition 74

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "front", "back", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1, and are only used for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The embodiment of the application provides a rear cover device 7 which is used for a clothes treatment device to guide the flow of circulating airflow of the clothes treatment device.

The embodiment of the application provides a clothes treatment device which is provided with a circulating air duct. Referring to fig. 1, the laundry treating apparatus includes a cabinet 1, a drum assembly 2 disposed in the cabinet 1, and a rear cover assembly 7 according to any embodiment of the present application.

With continued reference to fig. 1, the drum assembly 2 has a laundry treatment chamber 2a, a circulation duct communicating with the laundry treatment chamber 2a, and an air flow passage 71a located on the circulation duct, that is, an air flow in the circulation duct flows through the interior of the rear cover device 7 and the laundry treatment chamber 2 a.

The specific type of the laundry treating apparatus is not limited, and may be, for example, a dryer, a washer-dryer, etc.

Exemplarily, in an embodiment in which the laundry treating apparatus is an all-in-one washer dryer, the drum assembly 2 includes an inner drum and an outer drum, and the inner drum is rotatably disposed in the outer drum.

In the embodiment in which the laundry treating apparatus is a dryer, the drum unit 2 is configured with only an inner drum, and not with an outer drum, that is, the laundry treating apparatus has only one drum in this embodiment.

The rear cover device 7 may be provided inside the casing 1 or outside the casing 1.

Exemplarily, in an embodiment in which the laundry treating apparatus is a washer dryer, the back cover device 7 is disposed inside the cabinet 1, that is, the back cover device 7 is hidden inside the cabinet 1.

Exemplarily, in an embodiment in which the laundry treating apparatus is a clothes dryer, the rear cover device 7 is disposed outside the cabinet 1 and at a rear side of the rear sidewall 11 of the cabinet 1. Specifically, referring to fig. 3 to 5, the rear sidewall 11 of the box 1 is provided with an air outlet 1a and an air inlet 1b, and the air flow channel 71a communicates the air outlet 1a and the air inlet 1 b. In this embodiment, the rear cover device 7 is exposed to the outside of the clothes treating apparatus, and noise generated by the rear cover device 7 is directly radiated to the surrounding environment, and therefore, the noise reduction treatment of the rear cover device 7 is particularly important.

It should be noted that the clothes treatment apparatus is provided with a condensing device for cooling and dehumidifying, a heating element for heating dehumidified air, and a wind wheel 6 on a circulating air duct located outside the clothes treatment cavity 2a, wherein the wind wheel 6 is used for making the air flow in the circulating air duct form a directional flow.

The drying process and principle of the laundry treating apparatus are as follows: the hot drying air flow enters the clothes treatment cavity 2a from the downstream of the circulating air duct, in the clothes treatment cavity 2a, the hot drying air flow flows through the surface of wet clothes, the hot and wet exchange is carried out with the wet clothes, the moisture in the clothes is absorbed and changed into the hot wet air flow, the hot wet air flow enters the upstream of the circulating air duct, a low-temperature drying air flow is formed after the condensation and the dehumidification of a condensing device in the circulating air duct, the low-temperature drying air flow forms the hot drying air flow after being heated by a heating element, and the hot drying air flow enters the clothes treatment cavity 2a again, so that the continuous and efficient drying of the clothes is realized.

Illustratively, in some embodiments, the laundry treating apparatus includes a base 5, an evaporator 3, and a condenser 4, the cabinet 1 is covered above the base 5, the evaporator 3 and the condenser 4 are disposed on the base 5 and on a circulating air duct, both the evaporator 3 and the condenser 4 are disposed on the circulating air duct, and the evaporator 3 is disposed upstream of the condenser 4 in an airflow flowing direction, and an airflow from the laundry treating chamber 2a sequentially flows through the evaporator 3 and the condenser 4 and then enters the airflow passage 71 a. Among them, the evaporator 3 and the condenser 4 are part of a heat pump system, that is, the laundry treating apparatus of the embodiment, which employs a heat pump technology to condense, dehumidify and heat the air stream.

The evaporator 3 is used as a condensing device for cooling and dehumidifying the air flow, and the condenser 4 is used as an air flow heating element.

In the related art, the rear cover is a single-layer plate structure, and the plate thickness of the rear cover is generally not more than 4mm (millimeters) based on factors such as manufacturing process and production cost, that is, the rear cover is a thin-walled member. In the process that the airflow flows through the rear cover, for the wall surface boundary layer of the rear cover, the flow velocity is reduced due to viscosity retardation in the boundary layer, and the flow velocity of the airflow outside the boundary layer is higher than that in the boundary layer, so that pressure pulsation is generated between the inside and the outside of the boundary layer, the rear cover is impacted, and dipole noise is generated; in addition, in the embodiment that the impeller is installed in the rear cover, the blades of the impeller periodically cut air to generate rotating noise, and accelerated air continuously pulsates and impacts the volute tongue of the rear cover to generate a dipole. Therefore, the wall surface of the rear cover in the related art is a noise radiation surface with a large area,

referring to fig. 6 and 8, the rear cover device 7 includes an inner cover 71 and an outer cover 72. The inner cover 71 is formed with an air flow passage 71a, and it is understood that the air flow passage 71a is located on the circulation duct.

Referring to fig. 6 and 7, the inner cover 71 includes a first side plate 711 and a plurality of protrusions 713 protruding from a surface of the first side plate 711, and referring to fig. 9, the airflow passage 71a and the protrusions 713 are located on two opposite sides of the first side plate 711.

With continued reference to fig. 9, the outer cover 72 is disposed on a side of the inner cover 71 away from the airflow passage 71 a. The outer cover 72 and the inner cover 71 define a sound-deadening chamber 7a, and each of the bosses 713 is located inside the sound-deadening chamber 7 a. Referring to fig. 10 to 14, the inner cover 71 is provided with a sound absorption hole 71b communicating the airflow passage 71a and the sound-deadening chamber 7a, and at least a part of the sound absorption hole 71b penetrates the first side plate 711 and the protrusion 713.

It should be noted that the penetration of at least part of the sound absorption hole 71b through the first side plate 711 and the protrusion 713 includes the following two cases: first, only a part of the sound absorbing holes 71b penetrate through the first side plate 711 and the protrusion 713, and the other part of the sound absorbing holes 71b penetrate only through the first side plate 711 and do not penetrate through the protrusion 713; and the second method comprises the following steps: each sound absorption hole 71b penetrates the first side plate 711 and the boss 713.

In the rear cover device 7 of the embodiment of the present application, the first side plate 711 is used as a perforated thin plate, and forms a perforated plate sound absorption structure with the back silencing cavity 7a, so that air in the sound absorption hole 71b generates friction with the hole wall due to resonance, and further loses sound energy, thereby reducing the noise radiated by the rear cover device 7. In addition, under the condition that the wall thickness of the inner cover 71 is not changed, the protrusions 713 of the embodiment of the present application can increase the thickness of the air column in the sound absorption hole 71b, that is, increase the flow path of the air flow in the sound absorption hole 71b, and improve the sound absorption effect on the low-frequency component noise.

The specific shape of the projection 713 is not limited, and for example, a hollow cylindrical shape, a hollow truncated cone shape, a hollow rectangular parallelepiped shape, or the like.

It is understood that the outer contour of the protrusions 713 may be regular or irregular in shape.

In some embodiments, referring to fig. 10, the protrusion thickness d1 of the protrusion 713 on the first side plate 711 is 2mm to 5mm, for example, 2mm, 2.4mm, 3mm, 3.5mm, 4mm, 4.6mm, 5mm, etc. In this embodiment, in the case of having the noise reduction function, the projecting thickness of the bosses 713 does not excessively increase the size of the rear cover device 7 in the front-rear direction of the laundry treating apparatus.

In some embodiments, referring to fig. 10, for the sound absorption holes 71b passing through the first side plate 711 and the protrusion 713, the hole depth d3 of the sound absorption holes 71b is 4mm to 9mm, for example, 4mm, 4.5mm, 5mm, 5.4mm, 6mm, 6.6mm, 7mm, 7.3mm, 7.8mm, 8mm, 8.5mm, 9mm, etc. The sound absorption hole 71b of this embodiment can control the air column thickness of the sound absorption hole 71b in a suitable range under the condition of satisfying the noise reduction, so that the air flow loses a large sound energy in the sound absorption hole 71 b.

Referring to fig. 5, 8 and 9, a side of the inner cover 71 facing away from the outer cover 72 is open, the air flow channel 71a includes an impeller mounting area 71a ' and an air supply area 71a ", the air supply area 71 a" is located downstream of the impeller mounting area 71a ' along the airflow direction, and the air flow channel 71a supplies air from the opening of the impeller mounting area 71a ' and supplies air from the opening of the air supply area 71a ".

Referring to fig. 2, 4 and 5, the air outlet 1a on the rear sidewall 11 of the box 1 is aligned with the impeller mounting area 71 a', and the air inlet 1b on the rear sidewall 11 of the box 1 is aligned with the air blowing area 71a ″.

After the rear cover device 7 is assembled in the box body 1, the rear side wall 11 of the box body 1 closes the opening of the inner cover 71, and the airflow enters the impeller mounting area 71 a' of the airflow channel 71a from the air outlet 1a below the rear side wall 11 of the box body 1, flows upwards along the airflow channel 71a, enters the box body 1 from the air inlet 1b above the rear side wall 11 of the box body 1, and further enters the clothes treatment cavity 2 a.

The specific structural form of the inner cover 71 is not limited, for example, referring to fig. 6 and 8, the inner cover 71 includes a first enclosing plate 712 connected to the first side plate 711, the first enclosing plate 712 extends along an edge of the first side plate 711, and the first enclosing plate 712 is located on a side of the first side plate 711 facing away from the second side plate 721, that is, the first enclosing plate 712 is located on a side of the first side plate 711 facing the box 1. The first side plate 711 and the first enclosing plate 712 define the air flow passage 71 a.

It should be noted that a volute tongue is formed at a position of the first enclosing plate 712 close to the air outlet position of the impeller 6, that is, the first enclosing plate 712 and the first side plate 711 corresponding to the impeller mounting region 71 a' form a volute, and the volute and the impeller 6 are matched to form a structural form of a centrifugal fan.

For example, referring to fig. 6 and 7, a first flange 7121 is formed at an end of the first enclosing plate 712 away from the first side plate 711. After the rear cover device 7 is assembled on the box body 1, the first flange 7121 is attached to the rear side wall 11 of the box body 1. The first flange 7121 can increase the contact area of the inner cover 71 and the rear side wall 11 of the box body 1, and improve the attachment reliability of the inner cover 71 and the rear side wall 11.

Illustratively, referring to fig. 6 and 7, the inner shroud 71 includes a plurality of mounting ears 714 disposed on the first flange 7121, the mounting ears 714 being provided with first connection apertures. During assembly, the inner cover 71 is attached to the rear side wall 11, and the inner cover 71 is mounted on the rear side wall 11 of the box body 1 by screwing screws into the rear side wall 11 through the first connecting holes.

In the rear cover device 7, the inner cover 71 bears large airflow impact during operation, and the mounting lugs 714 can improve the connection reliability of the inner cover 71 and the rear side wall 11 of the box body 1.

The inner cover 71 may be a split structure, for example, made of a plurality of plates joined together; the inner cover 71 may also be of an integrally formed structure, such as integrally injection molded, or formed from sheet metal by a cold working process.

The inner cover 71 is not limited to a plastic material, but may be made of a metal material. The inner cover 71 is made of plastic, i.e., injection molded plastic, such as ABS (Acrylonitrile Butadiene Styrene), PP (Polypropylene), etc.

The specific structure of the outer cover 72 is not limited, for example, referring to fig. 6, 8 and 9, the outer cover 72 includes a second side plate 721, the first side plate 711 and the second side plate 721 are stacked at intervals, that is, the first side plate 711 and the second side plate 721 are arranged in a face-to-face manner, the first side plate 711 and the second side plate 721 are arranged at intervals, and the sound-deadening cavity 7a is located between the first side plate 711 and the second side plate 721.

Illustratively, the outer cover 72 includes a second enclosing plate 722, the second enclosing plate 722 extends along the edge of the second side plate 721, and the second enclosing plate 722 is positioned on the side of the second side plate 721 facing the first side plate 711, that is, the second enclosing plate 722 is positioned on the side of the second side plate 721 facing the box body 1. The second enclosure 722 surrounds the first enclosure 712, and when the rear cover device 7 is assembled to the rear side wall 11 of the cabinet 1, the inner cover 71 is located in a space defined by the outer cover 72 and the rear side wall 11. In the related art, one side of the first side plate facing the box body 1 is provided with the second side plate, but the second enclosing plate 712 is not provided, and in the present application, by providing the second enclosing plate 722 and surrounding the first enclosing plate 712, the sound can be prevented from leaking outwards from the side, and the noise influence is reduced.

In some embodiments, referring to fig. 8, a second flange 7221 is formed at an end of the second enclosing plate 722 remote from the second side plate 721. After the rear cover device 7 is assembled on the box body 1, the second flange 7221 is attached to the rear side wall 11 of the box body 1. The second flange 7221 can increase the contact area between the outer cover 72 and the rear wall 11 of the case 1, and improve the reliability of the attachment between the outer cover 72 and the rear wall 11.

In some embodiments, the second flange 7221 is provided with a second coupling hole. During assembly, the outer cover 72 is attached to the rear side wall 11 and covers the inner cover 71, and the outer cover 72 can be mounted on the rear side wall 11 of the box body 1 by screwing screws into the rear side wall 11 through the first connecting holes.

The housing 72 may be a split structure, for example, made of multiple panels that are joined together; the outer cover 72 may also be a one-piece structure, such as injection molded in one piece, or formed from sheet metal by a cold-working process.

The material of the outer cover 72 is not limited, and may be plastic or metal. Illustratively, the housing 72 is a sheet metal component, i.e., made of metal.

It will be appreciated that in some embodiments, inner cover 71 is a plastic component and outer cover 72 is an integrally injection molded plastic component. In other embodiments, the inner cover 71 is a plastic part and the outer cover 72 is a sheet metal part. In still other embodiments, the inner cover 71 is a sheet metal part and the outer cover 72 is also a sheet metal part. In other embodiments, the inner cover 71 is a sheet metal component and the outer cover 72 is a plastic component.

In the embodiment that the inner cover 71 is a plastic part and the outer cover 72 is a sheet metal part, the inner cover 71 made of plastic is weaker in heat conduction capability, so that the inner cover has better heat insulation performance, the heat loss of the airflow in the process of flowing through the airflow channel 71a is smaller, and the energy consumption of the clothes treatment equipment is reduced; the housing 72 made of a metal material has excellent sound insulation performance, and therefore, this embodiment can achieve both heat preservation and sound insulation performance.

It should be noted that in some embodiments, the first shroud 712 may also include sound absorbing apertures.

In some embodiments, referring to fig. 10, the distance d2 between the first side plate 711 and the second side plate 721 is 7mm to 20mm, for example, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20 mm. The depth of the sound-deadening chamber 7a is related to the vibration-absorbing frequency, and the distance range of this embodiment enables the sound-deadening chamber 7a to have an appropriate depth, with the size of the rear cover device 7 controlled in an appropriate range, so that the resonance frequency is shifted toward the low-frequency end.

In some embodiments, with reference to fig. 10, the protrusion thickness d1 of the protrusion 713 on the first side plate 711 is 0.1 to 0.3 times the distance d2 between the first side plate 711 and the second side plate 721. E.g., 0.1, 0.12, 0.15, 0.18, 0.2, 0.23, 0.25, 0.3, etc. Specifically, the protrusion thickness of the protrusion 713 on the first side plate 711 is d1, the distance between the first side plate 711 and the second side plate 721 is d2, and d1 is d2 (0.1-0.3). In this embodiment, the first dimension is much smaller than the second dimension, taking into account the overall dimension of the rear cover device 7 in the front-rear direction of the laundry treating apparatus.

The specific shape of the sound-absorbing hole 71b is not limited, and may be circular, polygonal, elliptical, or the like.

In some embodiments, the equivalent diameter of the sound-absorbing holes 71b is 2.5mm to 10mm, for example, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10 mm. The size range is convenient to process and manufacture under the condition of having the sound absorption function.

It should be noted that if the hole diameter of the sound absorbing hole 71b is too small, the process complexity of the inner cover 71 increases, resulting in a high manufacturing cost of the rear cover device 7. If the aperture of the sound-absorbing hole 71b is too large, the air flow in the air flow passage 71a enters the sound-deadening chamber 7a from the sound-absorbing hole 71b, resulting in a large loss of the air volume of the air flow passage 71 a.

The equivalent diameter means the diameter of the circular sound-absorbing hole 71b having the same area as that of the non-circular sound-absorbing hole 71b when the sound-absorbing hole 71b is non-circular.

In some embodiments, the porosity on the first side panel 711 is 2% -40%, e.g., 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, etc. This range of porosity can be adapted to the frequency band of sound absorption to be achieved by the rear cover device 7 of the embodiment of the present application.

The porosity is a ratio of the sum of the areas of all the sound absorbing holes 71b in the first side plate 711 to the area of the first side plate 711.

In some embodiments, referring to fig. 9 and 10, the sound-deadening chamber 7a is an air chamber, that is, no sound-absorbing material is disposed in the sound-deadening chamber 7 a.

In other embodiments, referring to fig. 11 to 14, the rear cover device 7 includes a sound absorbing material 73, and the sound absorbing material 73 is disposed in the sound-deadening chamber 7 a. The specific type of the sound absorbing material 73 is not limited, and the sound absorbing material 73 can cause the sound waves passing through the sound absorbing holes 71b to lose sound energy again, further reducing the noise radiated from the rear cover device 7 to the environment.

Illustratively, in an embodiment where each sound-absorbing hole 71b passes through the first side plate 711 and the protrusion 713, the sound-absorbing material 73 covers an end of each protrusion 713 away from the first side plate 711 to close off each sound-absorbing hole 71 b. Note that the blocking means that the sound absorbing material 73 blocks the airflow entering the sound absorbing holes 71b, and the sound absorbing material 73 may be a material that is air-permeable or air-impermeable.

In some embodiments, referring to fig. 11 and 12, the sound absorbing material 73 includes a sound absorbing film layer 731, and the sound absorbing film layer 731 covers each sound absorbing hole 71 b. Each sound-absorbing hole 71b and the sound-deadening chamber 7a behind it form a row of cavity resonators. The sound absorption film layer 731 may be a plastic film, a varnished cloth, artificial leather, or the like. The sound absorption film layer 731 has the characteristics of air impermeability, softness, elasticity when being tensioned and the like, and absorbs incident sound energy near the resonance frequency.

In some embodiments, referring to fig. 11, the sound-deadening chamber 7a behind the sound-absorbing film layer 731 is an air chamber, i.e. the sound-absorbing material 73 only has the sound-absorbing film layer 731.

In other embodiments, referring to fig. 12, the sound absorbing material 73 further comprises a flexible sound absorbing material 732 filled in the sound-deadening chamber 7a behind the sound absorbing film layer 731. The flexible sound absorbing material 732 should have a large number of pores and/or gaps therein, and the pores should be as fine as possible and uniformly distributed within the material. The pores within the material should be interconnected rather than closed. The micropores are open to the outside, so that sound waves can easily enter the micropores.

The specific type of flexible sound absorbing material 732 is not limited, and illustratively includes one or more of organic fibrous material, hemp felt, inorganic fibrous material, glass wool, rock wool, mineral wool, urea formaldehyde foam, urethane foam.

In some embodiments, referring to fig. 13 and 14, in which each sound-absorbing hole 71b extends through the first side plate 711 and the protrusion 713, the sound-absorbing material 73 includes a flexible sound-absorbing material 732, and the flexible sound-absorbing material 732 is in a compressed state and blocks the sound-absorbing hole 71 b. That is, the flexible sound absorbing material 732 is compressed and compressed to minimize the flow of the air through the sound absorbing holes 71b and into the sound-deadening chamber 7a, thereby reducing the air flow loss.

In this embodiment, in the case of ensuring that the plate thickness of the inner cover 71 is the same as that in the related art, since the projections 713 increase the hole depth of the sound absorbing holes 71b, the flexible sound absorbing material 732, particularly the fibrous flexible sound absorbing material 732, such as sound absorbing cotton, is less likely to enter the airflow passage 71 a.

Specifically, the fibrous flexible sound absorbing material is a relatively bulky material, and may be deformed into the sound absorbing hole 71b after being compressed, and in the related art, if the protrusion is not provided, the fibrous flexible sound absorbing material is likely to enter the airflow channel, thereby affecting the amount of air and possibly interfering with the impeller.

The compression and compression method of the flexible sound absorbing material 732 is not limited.

For example, referring to fig. 14, in some embodiments, the first side plate 711 and the second side plate 721 compress the flexible sound absorbing material 732 therebetween, that is, the sound-deadening chamber 7a is filled with the flexible sound absorbing material 732.

In another embodiment, referring to fig. 3, the sound absorbing material 73 includes a partition 74 disposed between the first side plate 711 and the second side plate 721, the partition 74 and the first side plate 711 press the flexible sound absorbing material 732 therebetween, and an air interlayer is formed between the partition 74 and the second side plate 721.

It should be noted that the condenser 4 and the heating element may be located upstream of the airflow channel 71a in the airflow direction, or may be located downstream of the airflow channel 71 a.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," 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 embodiments of the present application. In this application, 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. Moreover, various embodiments or examples and features of different embodiments or examples described herein may be combined by one skilled in the art without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (16)

1. A rear cover device for a laundry treating apparatus, comprising:

an inner cover (71), the inner cover (71) being formed with an airflow passage (71a), the inner cover (71) including a first side plate (711) and a plurality of protrusions (713) protruding from a surface of the first side plate (711), the airflow passage (71a) and each of the protrusions (713) being located on opposite sides of the first side plate (711);

an outer cover (72), the outer cover (72) is arranged on one side of the inner cover (71) departing from the airflow channel (71a), the outer cover (72) and the inner cover (71) define a silencing cavity (7a), each protrusion (713) is positioned in the silencing cavity (7a), the inner cover (71) is provided with a sound absorption hole (71b) communicating the airflow channel (71a) and the silencing cavity (7a), and at least part of the sound absorption hole (71b) penetrates through the first side plate (711) and the protrusion (713).

2. The rear cover device according to claim 1, wherein the protrusion thickness of the protrusion (713) on the first side plate (711) is 2mm to 5 mm.

3. The rear cover device according to claim 1, wherein the hole depth of the sound absorption hole (71b) penetrating the first side plate (711) and the boss (713) is 4mm to 9 mm.

4. The rear cover device according to claim 1, wherein the equivalent diameter of the sound-absorbing hole (71b) is 2.5mm to 10 mm.

5. Rear cover arrangement according to claim 1, characterized in that the outer cover (72) is a metal piece; and/or the inner cover (71) is made of plastic.

6. The rear cover device according to claim 1, wherein the outer cover (72) comprises a second side plate (721), the first side plate (711) and the second side plate (721) are arranged in a stacked manner at intervals, and the protrusion thickness of the protrusion (713) on the first side plate (711) is 0.1 to 0.3 times the distance between the first side plate (711) and the second side plate (721).

7. The rear cover device according to claim 1, wherein the outer cover (72) comprises a second side plate (721), the first side plate (711) and the second side plate (721) are arranged in a stacked manner at intervals, and the distance between the first side plate (711) and the second side plate (721) is 7 mm-20 mm.

8. Rear cover arrangement according to any of claims 1-5, characterized in that the rear cover arrangement comprises sound absorbing material (73), which sound absorbing material (73) is arranged in the sound-deadening chamber (7 a).

9. A rear cover arrangement as claimed in claim 8, wherein each sound-absorbing aperture (71b) extends through the first side plate (711) and the protrusion (713), the sound-absorbing material (73) comprising a sound-absorbing film layer (731), the sound-absorbing film layer (731) covering an end of each protrusion (713) remote from the first side plate (711) to close off each sound-absorbing aperture (71 b).

10. The rear cover apparatus according to claim 8, wherein each of the sound-absorbing holes (71b) penetrates the first side plate (711) and the boss (713), and the sound-absorbing material (73) includes a flexible sound-absorbing material (732), and the flexible sound-absorbing material (732) is in a compressed state and blocks each of the sound-absorbing holes (71 b).

11. Rear cover arrangement according to claim 10, characterized in that the outer cover (72) comprises a second side plate (721), the first side plate (711) and the second side plate (721) being arranged stacked at intervals, the first side plate (711) and the second side plate (721) squeezing the flexible sound absorbing material (732) in between.

12. The rear cover arrangement according to claim 10, wherein the outer cover (72) comprises a second side plate (721), the first side plate (711) and the second side plate (721) being arranged in a spaced-apart stacked arrangement; the rear cover device comprises a partition plate (74) arranged between the first side plate (711) and the second side plate (721), the flexible sound absorption material (732) is squeezed between the partition plate (74) and the first side plate (711), and an air interlayer is formed between the partition plate (74) and the second side plate (721).

13. The aft cover arrangement according to any one of claims 1-7, wherein a side of the inner cover (71) facing away from the outer cover (72) is open, the air flow passage (71a) includes an impeller mounting area (71a ') and an air supply area (71a "), the air supply area (71 a") being located downstream of the impeller mounting area (71a ') in a flow direction of the air flow, the air flow passage (71a) supplying air from the opening of the impeller mounting area (71a ') and from the opening of the air supply area (71a ").

14. A laundry treating apparatus, characterized in that it has a circulating air duct, said laundry treating apparatus comprising a cabinet (1), a drum package (2) provided in said cabinet (1), said drum package (2) having a laundry treating chamber (2a), and a rear cover device according to any one of claims 1-13, said air flow passage (71a) and said laundry treating chamber (2a) being located on said circulating air duct.

15. Laundry treatment apparatus according to claim 14, characterized in that the rear side wall (11) of the cabinet (1) is provided with an air outlet (1a) and an air inlet (1 b); the rear cover device is arranged outside the box body (1) and located on the rear side of a rear side wall (11) of the box body (1), and the air flow channel (71a) is communicated with the air outlet (1a) and the air inlet (1 b).

16. The laundry treatment apparatus according to claim 14, characterized in that the laundry treatment apparatus includes a base (5), an evaporator (3), a condenser (4), and a wind wheel (6), the wind wheel (6) is disposed in the airflow channel (71a), the box (1) is covered above the base (5), the evaporator (3) and the condenser (4) are disposed on the base (5) and located on the circulating air duct, and the airflow from the laundry treatment chamber (2a) sequentially flows through the evaporator (3) and the condenser (4) and then enters the airflow channel (71 a).

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