Rear cover device and clothes processing equipment

Abstract

The utility model relates to the technical field of clothes treatment, and provides a rear cover device and clothes treatment equipment. The rear cover device comprises an inner cover and an outer cover, silencing holes are formed in the inner cover, the outer cover is arranged on the periphery of the inner cover in a covering mode, a first cavity is defined by the outer cover and the inner cover, a net-shaped grating structure is arranged on the surface of the side, facing the outer cover, of the inner cover and protrudes out of the surface of the inner cover, and a plurality of cavity-shaped body structures are constructed on the surface of the side, facing the outer cover, of the inner cover. The multiple silencing holes are distributed in the multiple cavity structures in a scattered mode. Noise waves penetrate through the silencing holes from the inner side of the inner cover and then enter the cavity structures, the impedance of the cavity structures to the noise waves is larger than that of airflow on the inner side of the inner cover to the noise waves, therefore, the phase of the noise waves in the first cavity is not consistent with that of the noise waves on the inner side of the inner cover, and the wave values of the two noise waves are counteracted due to the existence of the phase difference. Therefore, the energy of the noise waves is reduced, the sound insulation index of the tangential propagation noise waves is enhanced, and the noise reduction effect is good.

Description

Technical Field

[0001] This invention relates to the field of garment processing technology, and more particularly to a back cover device and garment processing equipment. Background Technology

[0002] Clothing drying equipment is an indispensable household appliance in modern homes. As a drying tool, it effectively shortens drying time and improves efficiency. However, clothing drying equipment generates significant noise during operation, primarily from the fan. Fan noise can account for up to 50% of the total noise level in clothing drying equipment; therefore, reducing fan noise is crucial.

[0003] In related technologies, methods to reduce wind noise include optimizing the impeller and duct system or using sound-absorbing and insulating materials. While impeller and duct system optimization is nearing perfection, wind noise still negatively impacts daily life, and the effectiveness of using sound-absorbing and insulating materials is limited. Therefore, how to reduce wind noise in garment processing equipment has become a pressing technical problem to be solved in this field. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, the present invention provides a back cover device and a garment processing device.

[0005] The first aspect of the present invention provides a rear cover device, comprising:

[0006] Inner cover, which is provided with multiple sound-absorbing holes;

[0007] An outer cover is provided outside the inner cover and together with the inner cover to form a first cavity. The inner cover has a mesh grid structure on the side surface facing the outer cover. The mesh grid structure protrudes from the surface of the inner cover and forms multiple cavity structures on the side surface of the inner cover facing the outer cover. Multiple sound-absorbing holes are distributed in multiple cavity structures.

[0008] The rear cover device provided by this invention allows noise waves to enter the cavity structure after passing through the silencing hole from the inside of the inner cover. The impedance of the cavity structure to the noise waves is greater than the impedance of the airflow inside the inner cover to the noise waves. Therefore, the phase of the noise waves in the first cavity is inconsistent with the phase of the noise waves inside the inner cover. The two noise waves cancel each other out due to the phase difference, thereby reducing the energy of the noise waves, enhancing the sound insulation of tangentially propagating noise waves, and achieving good noise reduction effect.

[0009] In some embodiments, the mesh grid structure includes a plurality of grid ribs, which intersect to form a plurality of grid units, and each grid unit constructs a cavity structure.

[0010] In some embodiments, each of the grid units includes a plurality of side plates connected end to end, and at least one of the side plates of each grid unit is provided with an opening, and two adjacent grid units are connected through the opening.

[0011] In some embodiments, the first cavity is further provided with a sealing plate, which is fitted and connected to the side of the mesh grid structure opposite to the inner cover to cover the plurality of cavity structures.

[0012] In some embodiments, the side surface of the side plate facing the outer cover is a first surface, and the opening is formed as a notch penetrating the first surface.

[0013] In some embodiments, at least a portion of the grille unit is rectangular and includes four side plates, each side plate of the grille unit having one of the openings.

[0014] In some embodiments, the side plate protrudes from the surface of the inner cover by a height of 6mm-20mm;

[0015] And / or, the length of the side plate is 20mm-100mm.

[0016] In some embodiments, the area of ​​the opening is 1 mm. 2 -100 mm 2 .

[0017] In some embodiments, the sealing plate is a metal plate.

[0018] A second aspect of the present invention provides a garment processing device, including a housing and a rear cover device as described in the first aspect, the rear cover device being disposed on the housing and located on the outside of the housing. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the clothing processing equipment described in an embodiment of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the inner cover according to an embodiment of the present invention;

[0023] Figure 3 for Figure 2 A magnified schematic diagram of the local structure at point A;

[0024] Figure 4 This is a schematic diagram of the transmission path of noise waves generated by the fan according to an embodiment of the present invention;

[0025] Figure 5 This is a comparison diagram of the sound insulation of the rear cover device described in this embodiment of the invention and a conventional rear cover device for noise waves of different frequency bands propagating (tangential propagation) along a direction parallel to the surface of the first inner cover.

[0026] Figure 6 This is a comparison diagram of the sound insulation of the rear cover device described in the embodiment of the present invention and a conventional rear cover device for noise waves of different frequency bands propagating along the direction perpendicular to the surface of the first inner cover (normal propagation).

[0027] Figure 7 This is a schematic diagram illustrating the noise reduction effect of the rear cover device described in an embodiment of the present invention.

[0028] Among them, 1. Inner cover; 11. Silencing hole; 12. Side plate; 121. First surface; 13. Opening; 2. Outer cover; 3. Mesh grid structure; 4. Sealing plate; 5. Box body. Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0031] Clothing processing equipment, including dryers and dry-cleaning combos, is an indispensable household appliance in modern homes. It effectively shortens drying time and improves efficiency. However, clothing processing equipment generates significant noise during operation, which not only affects the comfort of the living environment but may also have some impact on human health. Therefore, controlling the noise level of dryers and reducing noise pollution is an important direction for improving the performance of clothing processing equipment and the user experience.

[0032] The noise from garment processing equipment mainly originates from the rotation of the drum, the operation of the motor and fan, and the vibration of structural components. Wind noise generated by the fan can account for up to 50% of the total noise in garment processing equipment, making its reduction particularly important. Related technologies reduce wind noise by optimizing the impeller and duct system or by using sound-absorbing and insulating materials. While impeller and duct system optimization is nearing perfection, wind noise still negatively impacts daily life, and the effectiveness of using sound-absorbing and insulating materials is limited.

[0033] Therefore, this application provides a rear cover device that can effectively reduce wind noise in garment handling equipment. (Refer to...) Figures 1 to 7 As shown, the rear cover device includes an inner cover 1 and an outer cover 2. The inner cover 1 is provided with a sound-absorbing hole 11. The outer cover 2 covers the outer periphery of the inner cover 1 and forms a first cavity with the inner cover 1. A mesh grid structure 3 is provided on the side surface of the inner cover 1 facing the outer cover 2. The mesh grid structure 3 protrudes from the surface of the inner cover 1 and constructs multiple cavity structures on the side surface of the inner cover 1 facing the outer cover 2. Multiple sound-absorbing holes 11 are distributed in multiple cavity structures.

[0034] like Figures 1 to 3 As shown, the inner cover 1 is provided with silencing holes 11, which extend along the thickness direction of the inner cover 1 and penetrate through the inner cover 1. The mesh grid structure 3 constructs multiple cavity structures, and the multiple silencing holes 11 are distributed in multiple cavity structures. Noise waves from the inner side of the inner cover 1 (the side of the inner cover away from the outer cover) enter the cavity structure through the silencing holes 11. After the noise waves pass through the silencing holes 11 from the inner side of the inner cover 1, they enter the cavity structure. The impedance of the cavity structure to the noise waves is greater than the impedance of the airflow inside the inner cover 1 to the noise waves. Therefore, the phase of the noise waves in the first cavity is inconsistent with the phase of the noise waves inside the inner cover 1. The two noise waves cancel each other out due to the existence of the phase difference, thereby reducing the energy of the noise waves.

[0035] like Figure 4 As shown, the wind noise generated by the impeller of the fan enters the rear cover device through the air outlet on the housing 5, and mainly has two propagation directions and paths: one is propagation along the direction parallel to the surface of the inner cover 1, which is tangential propagation; the other is propagation along the direction perpendicular to the surface of the inner cover 1, which is normal propagation. Without the mesh grid structure 3, the tangentially propagating noise wave would hardly be "blocked," and the noise reduction effect would be very weak. The mesh grid structure 3 has a good "blocking" effect on the tangentially propagating noise wave coming out of the silencing hole 11, greatly isolating the noise wave's ability to propagate along the surface of the inner cover 1, and enhancing the sound insulation of the tangentially propagating noise wave. "Blocking" can be understood as the change in the transmission path of the noise wave when it enters the physical medium from the gas medium because the density of the physical medium is greater than that of the gas, thus weakening the energy of the noise wave passing through the physical medium. The mesh grid structure 3 is the physical medium.

[0036] Of course, the airflow carrying noise waves inside the silencing holes 11 generates friction with the hole wall due to resonance, thereby reducing the energy of the noise waves. At the same time, the airflow in the first cavity and the airflow columns in the multiple silencing holes 11 form a resonance system, and the energy of the noise waves is reduced after passing through this resonance system.

[0037] As one possible implementation, the mesh grid structure 3 specifically includes multiple grid ribs, which intersect to form multiple grid units, each grid unit constructing a cavity-like structure. The inner cover 1 and the mesh grid structure 3 can be injection molded into an integral structure.

[0038] Although the impedance of the mesh grid structure 3 to the noise wave is greater than the impedance of the airflow inside the inner cover 1 to the noise wave, the phase of the noise wave in the first cavity is inconsistent with the phase of the noise wave inside the inner cover 1. However, due to the over-impedance in the cavity structure, the peak value of the noise wave in the first cavity is smaller than the peak value of the noise wave inside the inner cover 1. The two noise waves will cancel each other out due to the phase difference, but the canceled energy is low.

[0039] Therefore, in some embodiments, the grille unit includes multiple side plates 12 connected end to end, and at least one side plate 12 of each grille unit is provided with an opening 13, and two adjacent grille units are connected through the opening 13. The airflow entering the grille unit through the silencing hole 11 can enter and exit another adjacent grille unit through the opening 13 to eliminate over-impedance, thereby increasing the peak value of the noise wave in the first cavity, so that when the noise wave in the first cavity cancels out the noise wave on the inside of the inner cover 1, more noise wave energy can be consumed, resulting in a better noise reduction effect.

[0040] In some embodiments, a sealing plate is provided in the first cavity, and a sealing plate 4 is attached to the side of the mesh grid structure 3 facing away from the inner cover 1. The sealing plate 4 is attached to the mesh grid structure 3 to cover multiple cavity structures, forming multiple second cavities. That is, the side surface of the inner cover 1 facing the outer cover 2, the side plates 12 of multiple grid units, and the sealing plate 4 enclose multiple second cavities. The sealing plate 4 firstly improves the blocking effect on noise waves propagating in a direction perpendicular to the surface of the inner cover 1, and secondly facilitates the phase adjustment of noise waves entering the second cavity after passing through the silencing hole 11, so as to promote the cancellation of noise waves in the first cavity with noise waves inside the inner cover 1, thereby reducing the energy of the noise waves.

[0041] In some embodiments, such as Figure 3As shown, the side surface of the side plate 12 facing the outer cover 2 is the first surface 121, and the opening 13 is formed as a notch that penetrates the first surface 121. That is to say, the opening 13 is U-shaped. The inner cover 1 and the mesh grid structure 3 are integrally formed during injection molding. The opening 13 penetrating the first surface 121 facilitates demolding during injection molding and simplifies the molding process. For example, when molding the mesh grid structure 3, it is only necessary to press a notch on the top and bottom of the first surface 121 of the side plate 12.

[0042] To achieve a phase difference between the noise wave phase inside the first cavity and the noise wave phase inside the inner cover 1, while avoiding excessively low peak values ​​of the noise wave inside the first cavity, requirements are placed on the size of the mesh grid structure 3 and the opening area of ​​each grid unit.

[0043] In some embodiments, such as Figure 3 As shown, at least some of the grid units are rectangular, but can be square or rectangular. Each grid unit includes four side plates 12, each with an opening 13. Given a fixed total opening area for each grid unit, having an opening 13 on all four side plates 12, compared to having an opening 13 on only one side plate 12, reduces the opening area of ​​one side plate 12, preventing it from becoming too large and affecting the grid unit's ability to block noise waves from the corresponding silencing holes 11 in one direction. Simultaneously, the inner cover 1 and the mesh grid structure 3 are integrally molded during injection molding. The smaller area of ​​the openings 13 on the side plates 12 facilitates demolding during injection molding, preventing the side plates 12 from easily bending or even breaking during demolding.

[0044] In some embodiments, the height of the grille unit is 6mm-20mm. For example, the height of the grille unit can be 8mm, 12mm, 14mm or 18mm. That is, the height of the side plate 12 protruding from the surface of the inner cover is 6mm-20mm. If the side plate 12 is less than 6mm, the blocking effect on noise waves is not good. If the side plate 12 is more than 20mm, the inner cover 1 and the mesh grille structure 3 are not easy to demold during injection molding, which increases the cost and also increases the weight of the rear cover device.

[0045] The length of the side plate 12 is 20mm-100mm, and can be 30mm, 40mm, 50mm, 60mm, 70mm, 80mm or 90mm. The inner cover 1 and the mesh grid structure 3 are easy to demold during injection molding, and the grid unit formed by the side plate of this length has a good blocking effect on noise waves.

[0046] In some embodiments, the area of ​​the opening 13 on the side plate 12 of the grille unit is 1 mm. 2 -10mm 2 The area of ​​opening 13 can be 2mm.2 4mm 2 6mm 2 Or 8mm 2 The area of ​​opening 13 is less than 1 mm². 2 The inner cover 1 and the mesh grid structure 3 are difficult to demold during injection molding, and the grid unit cannot eliminate excessive obstruction of noise waves. Furthermore, the area of ​​the opening 13 is greater than 10 mm². 2 At the same time, it will reduce the blocking of noise waves by the grid unit. The specific height of the mesh grid structure 3 (height of the side plate 12), the side length of the grid unit (length of the side plate 12), and the area of ​​the opening 13 simultaneously affect the above-mentioned phase difference and peak value. The specific height of the mesh grid structure 3, the side length of the grid unit, and the area of ​​the opening 13 are adjusted according to the wind noise waves in different frequency bands to achieve the best noise reduction effect.

[0047] like Figure 5 As shown, Figure 5 This diagram compares the sound insulation of the rear cover device provided in this application with that of a conventional rear cover device for noise waves propagating (tangentially propagating) in a direction parallel to the surface of the inner cover 1 at different frequency bands. Figure 5 It can be seen that for noise waves with frequencies in the range of 0Hz-400Hz and 500Hz-3800 Hz, the rear cover device provided in this application embodiment provides significantly greater sound insulation than the traditional rear cover device. Figure 5 The value of the medium sound pressure level is the sound insulation amount.

[0048] like Figure 6 As shown, Figure 6 This diagram compares the sound insulation of the rear cover device provided in this application with that of a conventional rear cover device for noise waves propagating (normal propagation) in a direction perpendicular to the surface of the inner cover 1. Figure 6 It can be seen that for noise waves with frequencies between 500Hz and 5000Hz, the rear cover device provided in this application embodiment provides significantly greater sound insulation than the traditional rear cover device.

[0049] like Figure 7 As shown, the noise reduction effect of the rear cover device provided in this application embodiment is further verified by the overall noise reduction effect of the garment processing equipment. The noise of the garment processing equipment decreases by 1.8dB when the whole machine is unloaded under the energy efficiency program and by 1.7dB under the quick drying program.

[0050] In some embodiments, the sealing plate 4 is a metal plate, such as a stainless steel plate or an aluminum alloy plate, which has a good blocking effect on noise waves.

[0051] Other embodiments of the present invention provide a garment processing device, including a housing 5 and the aforementioned rear cover device. The rear cover device is disposed on the housing 5 and located outside the housing 5. The wind noise generated by the operation of the fan impeller enters the rear cover device through the air outlet on the housing 5. The outer cover 2 covers the air outlet on the housing 5.

[0052] The garment processing device provided in the above embodiments of the present invention has the beneficial effects of the back cover device of any of the above embodiments because it includes the back cover device of any of the above embodiments, and will not be described again here.

[0053] It should be noted that the clothing processing equipment can specifically be a washing machine, dryer, washer-dryer combo, etc. Specifically, it can be a drum washing machine, a drum washer-dryer combo, a drum dryer, or other types of clothing processing equipment.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rear cover device, characterized in that, include: Inner cover, which is provided with multiple sound-absorbing holes; An outer cover is provided outside the inner cover and together with the inner cover to form a first cavity. The inner cover has a mesh grid structure on the side surface facing the outer cover. The mesh grid structure protrudes from the surface of the inner cover and forms multiple cavity structures on the side surface of the inner cover facing the outer cover. Multiple sound-absorbing holes are distributed in multiple cavity structures.

2. The rear cover device according to claim 1, characterized in that, The mesh grid structure includes multiple grid ribs, which intersect to form multiple grid units, and each grid unit constructs a cavity structure.

3. The rear cover device according to claim 2, characterized in that, Each of the grid units includes multiple side plates connected end to end, and at least one of the side plates of each grid unit is provided with an opening, through which two adjacent grid units are connected.

4. The rear cover device according to claim 3, characterized in that, The first cavity is also provided with a sealing plate, which is attached to the side of the mesh grid structure opposite to the inner cover to cover the multiple cavity structures.

5. The rear cover device according to claim 3, characterized in that, The side surface of the side plate facing the outer cover is the first surface, and the opening is formed as a notch penetrating through the first surface.

6. The rear cover device according to claim 3, characterized in that, At least a portion of the grille unit is rectangular and includes four side plates, each side plate of the grille unit having one of the openings.

7. The rear cover device according to claim 3, characterized in that, The height by which the side plate protrudes from the surface of the inner cover is 6mm-20mm; And / or, the length of the side plate is 20mm-100mm.

8. The rear cover device according to claim 3, characterized in that, The area of ​​the opening is 1 mm. 2 -100mm 2 .

9. The rear cover device according to claim 4, characterized in that, The sealing plate is a metal plate.

10. A garment processing device, characterized in that, It includes a housing and a rear cover device as described in any one of claims 1 to 9, the rear cover device being disposed on the housing and located on the outside of the housing.

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