A washing machine air duct noise reduction device and a washing machine having the same

Abstract

The present invention provides a washing machine air duct noise reduction device and a washing machine having the same, wherein the noise reduction device comprises an inlet, a guide cavity, a sound absorption cavity and an outlet; the inlet is provided with a first micro-perforated plate; the guide cavity is surrounded by a partition and is divided into an air inlet cavity and an air outlet cavity by the guide cavity; the sound absorption cavity is surrounded by a partition and a second micro-perforated plate; a sound absorbing material is provided on the partition, which can dissipate energy when in contact with the airflow to achieve the purpose of noise reduction; the first micro-perforated plate and the second micro-perforated plate have perforations; the inlet is connected with the air inlet cavity, and the outlet is connected with the air outlet cavity; the airflow enters the air inlet cavity from the first micro-perforated plate, and hair debris therein is filtered; the airflow in the air inlet cavity, the airflow in the sound absorption cavity and the airflow entering the air outlet cavity are respectively in contact with the sound absorbing material to complete three-level noise reduction; the washing machine air duct noise reduction device of the present invention adopts a labyrinth structure and different noise reduction materials to complete multi-level noise reduction, and has a good noise reduction effect; it is easy to install and has a high user experience.

Description

Technical Field

[0001] The present invention relates to the field of laundry equipment, and in particular to a washing machine air duct noise reduction device and a washing machine having the same. Background Art

[0002] With the continuous development of washing machine technology, washing machines now have more and more functions. For example, the popular drying function, while bringing convenience to users, the drying system itself will also bring various noise problems, which will directly affect the user experience.

[0003] At present, the main drying methods of washing machines are electric heating and heat pump. The conventional electric heating drying system mainly includes a drum and a drying component, wherein the drying component includes a heating duct, a condensing duct, a fan and a heating device. After the airflow transported by the fan is heated by the heating device, it enters the drum through the heating duct and exchanges heat and moisture with the clothes in the drum, taking away the moisture on the clothes and turning it into hot and humid airflow, and then enters the condensing duct; in the condensing duct, the hot and humid airflow is cooled by the cooling water in the duct, and the water vapor condenses and is discharged with the cooling water; the dehumidified airflow enters the heating duct through the fan again for the next cycle. Regardless of whether the washing machine is drying or dehydrating, there is a large airflow in the condensing duct, which is prone to airflow pulsation noise. Summary of the invention

[0004] To this end, the present invention provides a washing machine air duct noise reduction device and a washing machine having the same, so as to solve the problems of complex noise reduction structure and low noise reduction efficiency in the prior art.

[0005] The present invention provides a washing machine air duct noise reduction device, the washing machine has a fan and an air duct, the washing machine air duct noise reduction device is arranged on the air duct downstream of the fan, and comprises:

[0006] The inlet is provided with a first micro-perforated plate, wherein the first micro-perforated plate has perforations; the airflow in the air duct enters the washing machine air duct noise reduction device through the perforations of the first micro-perforated plate;

[0007] A guide cavity is surrounded by a baffle, and a first sound absorbing material is provided on the baffle; the airflow entering the guide cavity contacts the first sound absorbing material and dissipates energy; a guide cavity is provided in the guide cavity, and the guide cavity is divided into an air inlet cavity and an air outlet cavity; the air inlet cavity is connected to the inlet;

[0008] A sound absorbing cavity is surrounded by a partition and a second micro-perforated plate; the second micro-perforated plate has perforations; a second sound absorbing material is arranged on the partition, and the airflow entering the sound absorbing cavity contacts the second sound absorbing material and dissipates energy; the sound absorbing cavity is connected with an air inlet cavity and an air outlet cavity; the airflow in the air inlet cavity enters the sound absorbing cavity through the perforations of the second micro-perforated plate, and enters the air outlet cavity after being subjected to noise reduction treatment by the sound absorbing cavity;

[0009] The outlet is communicated with the air outlet cavity, and the airflow re-enters the air duct from the outlet.

[0010] Further optionally, the flow direction of the airflow in the air inlet cavity is different from that in the air outlet cavity; while the airflow changes its flow direction through the air inlet cavity and the air outlet cavity, the contact area with the first sound absorbing material increases and the contact time is prolonged.

[0011] Further optionally, the sound absorbing chamber is arranged downstream of the air inlet chamber, and at least a part of the airflow of the air inlet chamber first passes through the perforations of the second micro-perforated plate and then contacts the second sound absorbing material of the sound absorbing chamber.

[0012] Further optionally, the guide cavity includes a first guide cavity and a second guide cavity; the first guide cavity has a first air inlet cavity and a first air outlet cavity, and the second guide cavity has a second air inlet cavity and a second air outlet cavity; the first air inlet cavity and the second air inlet cavity are connected to the inlet, and the airflow enters the first air inlet cavity and the second air inlet cavity from the inlet to complete the first-level noise reduction.

[0013] Further optionally, the sound absorption cavity is connected with the first air inlet cavity, the second air inlet cavity, the first air outlet cavity, and the second air outlet cavity; the airflow in the first air inlet cavity and the second air inlet cavity enters the sound absorption cavity to complete the secondary noise reduction.

[0014] Further optionally, the outlet has a first outlet and a second outlet, which are respectively arranged on both sides of the inlet; the first air outlet cavity is connected to the first outlet, and the second air outlet cavity is connected to the second outlet; the airflow in the sound absorption cavity enters the first air outlet cavity and / or the second air outlet cavity to complete the three-level noise reduction, and enters the air duct through the first outlet and / or the second outlet.

[0015] Further optionally, the air duct noise reduction device is a symmetrical structure, and the first air inlet cavity and the second air inlet cavity, the first air outlet cavity and the second air outlet cavity, and the first outlet and the second outlet are all symmetrically arranged.

[0016] Further optionally, the first micro-perforated plate and the second micro-perforated plate have holes with different apertures, and by adjusting the aperture size, hole depth or perforation rate of the perforations, the first micro-perforated plate and the second micro-perforated plate have different noise reduction frequencies.

[0017] Further optionally, the depth of the sound absorption cavity is adjusted along the airflow direction of the air inlet cavity, and the sound absorption cavity has different noise reduction effects.

[0018] Further optionally, the first micro-perforated plate and the guide plate of the guide cavity, and the second micro-perforated plate and the partition plate of the sound absorption cavity are all detachably connected.

[0019] Further optionally, the aperture of the first micro-perforated plate and the second micro-perforated plate is ≤1 mm, the plate thickness is ≤1 mm, and the perforation rate ranges from 4% to 6%; and the depth of the sound absorption cavity is 20 mm to 40 mm.

[0020] Further optionally, the first micro-perforated plate and the second micro-perforated plate are new porous sound-absorbing materials; the first sound-absorbing material and the second sound-absorbing material are both glass fibers.

[0021] The present invention also provides a washing machine, comprising a fan, an air duct and a washing machine air duct noise reduction device as described in any one of the above items, wherein the washing machine air duct noise reduction device is arranged on the air duct downstream of the fan and is detachably connected to the air duct; the inlet is connected to the upper air outlet of the air duct, and the outlet is connected to the lower air outlet of the air duct.

[0022] The washing machine air duct noise reduction device provided by the present invention has a guide cavity and a sound absorption cavity, which is arranged at the washing machine air duct, and the air flow enters from the micro-perforated plate at the entrance, and the micro-perforated plate can filter the hair debris therein; the air flow in the air inlet cavity contacts with the sound absorbing material and dissipates energy, and the first-level noise reduction is performed, and the air flow enters the sound absorbing cavity through the micro-perforated plate and contacts with the sound absorbing material and dissipates energy, and the second-level noise reduction is performed; the air flow changes direction and enters the air outlet cavity and contacts with the sound absorbing material and dissipates energy, and the third-level noise reduction is performed; the washing machine air duct noise reduction device of the present invention adopts a maze structure and different sound absorbing materials to achieve the purpose of multi-stage noise reduction, and has a good noise reduction effect; it is detachably connected to the air duct, which is easy to install and has a high user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0025] Figure 1a This is a schematic diagram of the main structure of an embodiment of the washing machine air duct noise reduction device provided by the present invention;

[0026] Figure 1bThis is a schematic diagram of the axial structure of an embodiment of the washing machine air duct noise reduction device provided by the present invention;

[0027] Figure 2 A schematic diagram of the structure of an embodiment of the air duct of a washing machine provided by the present invention;

[0028] In the figure:

[0029] 1-noise reduction device; 11-air inlet chamber; 111-first air inlet chamber; 112-second air inlet chamber; 12-inlet; 121-first micro-perforated plate; 131-first guide plate; 132-second guide plate; 14-air outlet chamber; 141-first air outlet chamber; 142-second air outlet chamber; 15-outlet; 151-first outlet; 152-second outlet; 16-sound absorption chamber; 161-second micro-perforated plate; 17-partition plate; 171-first sound absorption material; 172-second sound absorption material;

[0030] 2- air duct; 21- air duct entrance; 22- air duct exit; 231- left wall; 232- right wall. DETAILED DESCRIPTION

[0031] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0033] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0035] The washing machine air duct noise reduction device provided by the present invention has a guide cavity and a sound absorption cavity, which is arranged at the washing machine air duct, and the air flow enters from the micro-perforated plate at the entrance, and the micro-perforated plate can filter the hair therein; the air flow in the air inlet cavity contacts with the sound absorbing material and dissipates energy, and the first-level noise reduction is performed, and the air flow enters the sound absorbing cavity through the micro-perforated plate and contacts with the sound absorbing material and dissipates energy, and the second-level noise reduction is performed; the air flow changes direction and enters the air outlet cavity and contacts with the sound absorbing material and dissipates energy, and the third-level noise reduction is performed; the air duct noise reduction device of the present invention adopts a labyrinth structure and different sound absorbing materials to achieve the purpose of multi-level noise reduction, and has a good noise reduction effect; the air duct noise reduction device is detachably connected to the air duct, which is easy to install.

[0036] Example 1

[0037] <Noise reduction device>

[0038] like Figure 1a and Figure 1bAs shown, this embodiment provides a washing machine air duct noise reduction device, wherein the washing machine has a fan and an air duct 2; the noise reduction device 1 is arranged on the air duct 2 downstream of the fan, and includes an inlet 12, a guide cavity, a sound absorption cavity 16 and an outlet 15; the inlet 12 is connected to the upper air outlet of the air duct 2, and a first micro-perforated plate 121 is arranged at the inlet 12, and the first micro-perforated plate 121 has perforations with different apertures; the air flow in the air duct 2 enters the noise reduction device 1 through the perforations of the first micro-perforated plate 121, and due to the holes The guide cavity is surrounded by a partition 17, and a first sound absorbing material 171 is provided on the partition 17. When the airflow enters the guide cavity, it contacts the first sound absorbing material 171 to dissipate the energy of the airflow, thereby achieving the purpose of reducing noise. In addition, a guide plate is provided in the guide cavity, which divides the guide cavity into an air inlet cavity 11 and an air outlet cavity 14. The air inlet cavity 11 is connected to the inlet 12, and the airflow is The inlet 12 enters the air inlet chamber 11; the flow direction of the airflow in the air inlet chamber 11 is different from that in the air outlet chamber 14, so that when the airflow changes its direction in the air inlet chamber 11 and the air outlet chamber 14, the contact area and contact time of the airflow with the first sound absorbing material 171 on the partition 17 are increased, thereby improving the noise reduction effect of the guide chamber; the sound absorbing chamber 16 is surrounded by the partition 17 and the second micro-perforated plate 161, and the second micro-perforated plate 161 has perforations with different apertures; the partition 17 is provided with a second sound absorbing material 171 on the second micro-perforated plate 161. The sound absorbing chamber 16 is connected with the air inlet chamber 11 and the air outlet chamber 14; when the airflow enters the sound absorbing chamber 16 through the perforations of the second micro-perforated plate 161, the second micro-perforated plate 161 has perforations with different apertures, which can reduce the airflow noise to different degrees. The airflow entering the sound absorbing chamber 16 contacts with the second sound absorbing material 172 on the partition 17, dissipates the energy in the airflow, and achieves the purpose of reducing noise; the outlet 15 is connected with the lower air outlet of the air duct, and the airflow enters the air duct 2 again from the outlet 15.

[0039] Preferably, the sound absorbing chamber 16 is disposed downstream of the air inlet chamber 11 , and at least a portion of the airflow of the air inlet chamber 11 first passes through the perforations of the second micro-perforated plate 161 and then contacts the second sound absorbing material 172 of the sound absorbing chamber 16 .

[0040] Preferably, the guide chamber includes a first guide chamber and a second guide chamber, which are respectively arranged on the left and right sides of the noise reduction device 1; the first guide chamber is divided into a first air inlet chamber 111 and a first air outlet chamber 141 by the upper end edge of the first guide plate 131, and the first air outlet chamber 141 is arranged on the left side of the first air inlet chamber 111; the second guide chamber is divided into a second air inlet chamber 112 and a second air outlet chamber 142 by the upper end edge of the second guide plate 132, and the second air outlet chamber 142 is arranged on the right side of the second air inlet chamber 112; the air inlet chamber 11 is divided into a first air inlet chamber 111 and a second air inlet chamber 112 by the partition 17; the lower ends of the first guide plate 131 and the second guide plate 132 form an inlet; the first air inlet chamber 111 and the second air inlet chamber 112 are connected to the inlet 12, and the airflow enters the air inlet chamber 11 from the inlet 12, and is diverted into the first air inlet chamber 111 and the second air inlet chamber 112.

[0041] Specifically, partitions 17 extending in the left and right directions are provided on the left and right sides of the inlet 12 of the noise reduction device 1, so that the airflow can only enter the air inlet chamber 11 through the first micro-perforated plate 121; after the airflow enters the first air inlet chamber 111 and the second air inlet chamber 112, it contacts the first sound-absorbing material 171 on the partition 17 and dissipates energy, so that the airflow noise is reduced, completing the first-level noise reduction.

[0042] Preferably, the sound absorption cavity 16 is connected with the first air inlet cavity 111, the second air inlet cavity 112, the first air outlet cavity 141, and the second air outlet cavity 142; the airflow in the first air inlet cavity 111 and the second air inlet cavity 112 enters the sound absorption cavity 16, and after noise reduction treatment, enters the first air outlet cavity 141 and / or the second air outlet cavity 142. Specifically, the sound absorption cavity 16 is a rectangular cavity structure, a second micro-perforated plate 161 is arranged at the lower end, a partition 17 is arranged at the upper end, and a second sound absorbing material 172 is arranged on the partition 17. The airflow entering the sound absorption cavity 16 along the length direction has a longer contact distance with the second sound absorbing material 172, so that the noise reduction effect is better.

[0043] Specifically, when the airflow enters the sound absorption cavity 16 from the second micro-perforated plate 161, the second micro-perforated plate 161 has a noise reduction effect on the airflow; the airflow entering the sound absorption cavity 16 contacts the second sound absorption material 172 on the partition 17 and dissipates energy, so that the airflow noise is reduced, completing the secondary noise reduction.

[0044] Preferably, the outlet 15 has a first outlet 151 and a second outlet 152, which are respectively arranged on both sides of the inlet 12; specifically, the first air outlet 151 is arranged at the lower side of the first air outlet cavity 141 and is connected to the first air outlet cavity 141; the second air outlet 152 is arranged at the lower side of the second air outlet cavity 142 and is connected to the second air outlet cavity 142; the airflow in the first air outlet cavity 141 enters the air duct 2 through the first air outlet 151, and the airflow in the second air outlet cavity 142 enters the air duct 2 through the second air outlet 152.

[0045] Specifically, after the airflow enters the first air outlet cavity 111 and the second air outlet cavity 112, it contacts the first sound absorbing material 171 on the partition 17 and dissipates energy, so that the airflow noise is reduced, completing the three-level noise reduction.

[0046] Preferably, the air duct noise reduction device 1 is a labyrinth-type symmetrical structure, and the first air inlet chamber 111 and the second air inlet chamber 112, the first air outlet chamber 141 and the second air outlet chamber 142, and the first outlet 151 and the second outlet 152 are all symmetrically arranged; the air flow directions of the air inlet chamber 11 and the air outlet chamber 14 are different, and the sound absorption chamber 16 is a rectangular cavity structure, so that the air flow passes through the air inlet chamber 11, the sound absorption chamber 16 and the air outlet chamber 14 in sequence, and the contact area between the air flow and the first sound absorbing material 171 and the second sound absorbing material 172 is increased, and the contact time is prolonged. Combined with the noise reduction treatment of the micro-perforated plate, the three-level noise reduction structure and treatment method make the noise reduction effect of the air flow obvious.

[0047] It should be noted that the first guide plate 131, the second guide plate 132 and the partition plate 17 provided in this embodiment are all flat plates, but the first guide plate 131, the second guide plate 132 and the partition plate 17 are not limited to flat plates, and can be corrugated plates or arc plates, on which the first sound absorbing material 171 or the second sound absorbing material 172 is arranged, both of which can increase the contact area between the airflow and the sound absorbing material, which is beneficial to noise reduction. The structure of the noise reduction device 1 provided in this embodiment is not limited to this, and multiple labyrinth structures or nested labyrinth structures can be arranged along the length or width direction, both of which can prolong the contact time between the airflow and the sound absorbing material, so that the noise reduction device has a better noise reduction effect.

[0048] Preferably, the first micro-perforated plate 121 and the second micro-perforated plate 161 have perforations with different apertures, and by adjusting the aperture size, hole depth or perforation rate of the perforations, the first micro-perforated plate 121 and the second micro-perforated plate 161 have different noise reduction frequencies; correspondingly, along the air flow direction of the air inlet cavity 11, by adjusting the depth of the sound absorption cavity 16, the sound absorption cavity 16 has different noise reduction effects.

[0049] Preferably, the first micro-perforated plate 121 and the guide plate of the guide cavity, and the second micro-perforated plate 161 and the partition of the sound absorption cavity are all detachably connected, which is convenient for connecting the first micro-perforated plate 121 of different structures with the guide plate of the guide cavity, and the second micro-perforated plate 161 with the partition 17 of the sound absorption cavity 16, so that the noise reduction device 1 can achieve the best noise reduction effect.

[0050] It should be noted that the number and structure of the first micro-perforated plates 121 and the second micro-perforated plates 161 are not limited, and multiple first micro-perforated plates 121 and second micro-perforated plates 161 with different structures can be provided according to actual needs.

[0051] Preferably, the first micro-perforated plate 121 and the second micro-perforated plate 161 are new porous sound-absorbing materials; the first sound-absorbing material 171 and the second sound-absorbing material 172 are glass fibers, and the noise reduction effect of the new porous sound-absorbing material and the glass fibers is combined to make the noise reduction device applicable to different airflows in the air duct. Specifically, the new porous sound-absorbing material is a clean sound-absorbing structure with low sound quality and high sound resistance, and has the characteristics of high temperature resistance, high-speed airflow impact resistance and environmental protection.

[0052] <Washing Machine>

[0053] like Figure 2 As shown, this embodiment provides a washing machine having a fan, an air duct 2 and an air duct noise reduction device as described in any of the above items, wherein the air duct noise reduction device 1 is arranged on the air duct 2 downstream of the fan, near the air duct outlet 22; the air duct noise reduction device 1 is connected to the air duct 2 with a detachable structure, which is convenient for maintenance and replacement of the noise reduction device 1; the inlet 12 of the air duct noise reduction device 1 is connected to the upper air outlet of the air duct 2, and the outlet 15 of the air duct noise reduction device 1 is connected to the lower air outlet of the air duct 2.

[0054] Preferably, partitions 17 extending in the left and right directions are provided on the left and right sides of the inlet 12 of the noise reduction device 1, and are respectively connected to the left wall 231 and the right wall 232 of the air duct 2, so that the airflow in the air duct 2 can only enter the noise reduction device 1 through the first micro-perforated plate 121; the first guide plate 131 and the second guide plate 132 are parallel to the air duct 2, so that the airflow enters the noise reduction device 1 along the air duct 2.

[0055] Preferably, a partition plate 17 extending in the front-to-rear direction is provided on the left side of the first air outlet cavity 141, and forms a first airflow guide cavity together with the left wall surface 231 of the air duct 2, so that the airflow in the first air outlet cavity 141 smoothly enters the air duct 2 through the first outlet 151 and the first airflow guide cavity.

[0056] Preferably, a partition plate 17 extending in the front-to-rear direction is provided on the right side of the second air outlet cavity 142, and forms a second air flow guiding cavity with the right wall surface 232 of the air duct 2, so that the air flow in the second air outlet cavity 142 can smoothly enter the air duct through the second outlet 152 and the second air flow guiding cavity.

[0057] <Working Principle>

[0058] The noise reduction principle of the air duct noise reduction device is as follows: the airflow in the air duct 2 enters the cavity through the perforations of the first micro-perforated plate 121 of the noise reduction device 1, and the first micro-perforated plate 121 can filter out the hair in the airflow; the airflow entering the air inlet cavity 11 is diverted by the partition 17 and flows to the first air inlet cavity 111 and the second air inlet cavity 112 respectively, and the airflow contacts the corresponding first sound-absorbing material 171 and dissipates energy, so that the airflow noise is reduced, and the first-level noise reduction is completed; part of the airflow in the first air inlet cavity 111 and the second air inlet cavity 112 enters the second micro-perforated plate 161 enters the sound absorbing cavity 16, the second micro-perforated plate 161 performs noise reduction treatment on the airflow, the airflow in the sound absorbing cavity 16 contacts and dissipates energy with the corresponding second sound absorbing material 172, so that the airflow noise is reduced, and the secondary noise reduction is completed; the airflow enters the first air outlet cavity 141 and the second air outlet cavity 142, contacts and dissipates energy with the corresponding first sound absorbing material 171, so that the airflow noise is reduced, and the tertiary noise reduction is completed; the airflow enters the air duct 2 again from the first outlet 151 and the first airflow guiding cavity, and / or from the second outlet 152 and the second airflow guiding cavity.

[0059] Example 2

[0060] This embodiment provides a washing machine air duct noise reduction device, wherein the aperture of the first micro-perforated plate and the second micro-perforated plate is ≤1mm, the plate thickness is ≤1mm, the perforation rate ranges from 4% to 6%, and the depth of the sound absorption cavity is 20mm to 40mm.

[0061] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A washing machine air duct noise reduction device, the washing machine having a fan and an air duct, It is characterized in that The washing machine air duct noise reduction device is arranged on the air duct downstream of the fan, and comprises: The inlet is provided with a first micro-perforated plate, wherein the first micro-perforated plate has perforations; the airflow in the air duct enters the washing machine air duct noise reduction device through the perforations of the first micro-perforated plate; A guide cavity is surrounded by a baffle, and a first sound absorbing material is provided on the baffle; the airflow entering the guide cavity contacts the first sound absorbing material and dissipates energy; a guide cavity is provided in the guide cavity, and the guide cavity is divided into an air inlet cavity and an air outlet cavity; the air inlet cavity is connected to the inlet; A sound absorbing cavity is surrounded by a partition and a second micro-perforated plate; the second micro-perforated plate has perforations; a second sound absorbing material is arranged on the partition, and the airflow entering the sound absorbing cavity contacts the second sound absorbing material and dissipates energy; the sound absorbing cavity is connected with an air inlet cavity and an air outlet cavity; the airflow in the air inlet cavity enters the sound absorbing cavity through the perforations of the second micro-perforated plate, and enters the air outlet cavity after being subjected to noise reduction treatment by the sound absorbing cavity; An outlet is communicated with the air outlet cavity, and the airflow reenters the air duct from the outlet; The air inlet chamber and the air outlet chamber are arranged opposite to each other on the left and right; the inlet and the outlet are both used to be arranged on one side of the upper air outlet of the air duct, the inlet is used to communicate with the upper air outlet of the air duct, and the outlet is used to communicate with the lower air outlet of the air duct; the air outlet chamber is used to be arranged toward the upper air outlet of the air duct, and the sound absorption chamber is used to be arranged on one side of the lower air outlet of the air duct.

2. The washing machine air duct noise reduction device according to claim 1, It is characterized in that The flow direction of the airflow in the air inlet cavity is different from that in the air outlet cavity; while the airflow changes its flow direction through the air inlet cavity and the air outlet cavity, the contact area with the first sound absorbing material increases and the contact time is prolonged.

3. The washing machine air duct noise reduction device according to claim 1, It is characterized in that The sound absorbing chamber is arranged downstream of the air inlet chamber, and at least a part of the airflow of the air inlet chamber first passes through the perforations of the second micro-perforated plate and then contacts the second sound absorbing material of the sound absorbing chamber.

4. The washing machine air duct noise reduction device according to claim 1, It is characterized in that The guide cavity includes a first guide cavity and a second guide cavity; the first guide cavity has a first air inlet cavity and a first air outlet cavity, and the second guide cavity has a second air inlet cavity and a second air outlet cavity; the first air inlet cavity and the second air inlet cavity are connected to the inlet, and the airflow enters the first air inlet cavity and the second air inlet cavity from the inlet to complete the first-level noise reduction.

5. The washing machine air duct noise reduction device according to claim 4, It is characterized in that The sound absorption cavity is connected with the first air inlet cavity, the second air inlet cavity, the first air outlet cavity, and the second air outlet cavity; the airflow in the first air inlet cavity and the second air inlet cavity enters the sound absorption cavity to complete the secondary noise reduction.

6. The washing machine air duct noise reduction device according to claim 5, It is characterized in that The outlet has a first outlet and a second outlet, which are respectively arranged on both sides of the inlet; the first air outlet cavity is connected to the first outlet, and the second air outlet cavity is connected to the second outlet; the airflow in the sound absorption cavity enters the first air outlet cavity and / or the second air outlet cavity to complete the three-level noise reduction, and enters the air duct through the first outlet and / or the second outlet.

7. The washing machine air duct noise reduction device according to claim 6, It is characterized in that The air duct noise reduction device is a symmetrical structure, wherein the first air inlet cavity and the second air inlet cavity, the first air outlet cavity and the second air outlet cavity, and the first outlet and the second outlet are all symmetrically arranged.

8. The washing machine air duct noise reduction device according to claim 1, It is characterized in that The first micro-perforated plate and the second micro-perforated plate have holes with different apertures. By adjusting the aperture size, hole depth or perforation rate of the perforations, the first micro-perforated plate and the second micro-perforated plate have different noise reduction frequencies.

9. The washing machine air duct noise reduction device according to claim 1, It is characterized in that The depth of the sound absorption cavity is adjusted along the airflow direction of the air inlet cavity, and the sound absorption cavity has different noise reduction effects.

10. The washing machine air duct noise reduction device according to claim 1, It is characterized in that The first micro-perforated plate and the partition of the flow guide cavity, and the second micro-perforated plate and the partition of the sound absorption cavity are all detachably connected.

11. The washing machine air duct noise reduction device according to claim 1, It is characterized in that The aperture of the first micro-perforated plate and the second micro-perforated plate is ≤1 mm, the plate thickness is ≤1 mm, and the perforation rate ranges from 4% to 6%; the depth of the sound absorption cavity ranges from 20 mm to 40 mm.

12. The washing machine air duct noise reduction device according to claim 1, It is characterized in that The first micro-perforated plate and the second micro-perforated plate are novel porous sound-absorbing materials; the first sound-absorbing material and the second sound-absorbing material are both glass fibers.

13. A washing machine, It is characterized in that A washing machine air duct noise reduction device having a fan, an air duct and any one of claims 1 to 12, wherein the washing machine air duct noise reduction device is arranged on the air duct downstream of the fan and is detachably connected to the air duct; the inlet is connected to the upper air outlet of the air duct, and the outlet is connected to the lower air outlet of the air duct.

Images