Sound and noise reduction air duct structure, air outlet device and air outlet equipment

Abstract

The application relates to the technical field of household appliances, in particular to a sound and noise reduction air duct structure, an air outlet device and equipment. The sound and noise reduction air duct structure comprises a shell, the shell has a hollow inner cavity, the inner cavity is provided with an air outlet, the position of the inner cavity away from the air outlet is provided with an open mouth, a noise reduction cavity is arranged in the area close to the air outlet, the opening of the noise reduction cavity is in the same direction as the open mouth, further comprising a cover body, the cover body is covered on the open mouth and simultaneously seals the opening of the noise reduction cavity. By arranging the noise reduction cavity close to the air outlet and covering the noise reduction cavity with the cover body, the air in the noise reduction cavity is relatively stationary to form an air flow buffer area, due to the existence of the air flow buffer area, the air flow noise is reflected back into the inner cavity, most of the noise is limited in the cavity and cannot effectively spread outward, thereby significantly reducing the noise transmitted to the outside.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a noise reduction duct structure, air outlet device, and air outlet equipment. Background Technology

[0002] With societal development and rising living standards, consumers are demanding greater comfort in their home environments. This necessitates that home appliances, while fulfilling basic functions, also operate with low noise. For example, air purifiers and electric fans that utilize turbine fans, while providing a comfortable living environment, inevitably generate noise during operation. Analysis reveals that this noise primarily originates from the vortex noise created when airflow passes through the air outlet. The sudden widening of the outlet's cross-section causes friction between the airflow and the inner wall of the outlet, significantly impacting the consumer's product experience. Therefore, reducing noise is crucial for improving the quality of these home appliances.

[0003] The above issues need to be addressed. Utility Model Content

[0004] The purpose of this application is to provide a noise reduction duct structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: In a first aspect, this application provides a noise reduction duct structure, comprising: The outer casing has a hollow inner cavity, and the inner cavity is provided with an air outlet; The inner cavity has an opening away from the air outlet, and a noise reduction cavity is provided in the area near the air outlet, with the opening of the noise reduction cavity facing the same direction as the opening; It also includes a cover that covers the opening and simultaneously seals the opening of the noise reduction cavity.

[0006] Furthermore, the noise reduction cavity is formed by the inner wall of the outer shell and a guide rib, the guide rib extending integrally from the inner wall of the outer shell; At least one noise reduction cavity is provided on one or both sides of the air outlet.

[0007] Furthermore, the noise reduction cavity includes a cavity disposed inside the inner cavity.

[0008] Furthermore, the noise reduction cavity is provided along the outer peripheral edge of the inner cavity.

[0009] Furthermore, the cross-section of the noise reduction cavity is triangular or parallelogram-shaped.

[0010] Furthermore, it includes sound-absorbing cotton, which is at least partially filled in the noise reduction cavity.

[0011] Furthermore, along the height direction of the outer shell and around the outer periphery of the opening, the inner wall of the outer shell is provided with a first step that is recessed inward toward the opening; The cover has a second step along its inner circumference on the side facing the outer shell, which is adapted to the first step. When closed, the first step is embedded within the second step.

[0012] Secondly, an air outlet device is proposed, including the above-mentioned air duct structure, wherein the inner cavity is also connected to an air inlet; It also includes a wind turbine disposed in the inner cavity and a motor for driving the wind turbine to rotate; The mounting bracket is horizontally mounted at the air inlet, and the motor is installed inside the mounting bracket.

[0013] Furthermore, an air duct is formed between the outer periphery of the impeller and the inner wall of the outer casing, and the air duct is connected to the air outlet.

[0014] Thirdly, an air outlet device is proposed, including the aforementioned noise reduction duct structure or the aforementioned air outlet device.

[0015] The technical solutions provided in this application have the following advantages compared with the prior art: Firstly, the noise reduction duct structure provided in this application effectively reduces noise by blocking the propagation path of noise. Specifically, a noise reduction cavity is placed in a region near the air outlet where airflow is high-speed and turbulent. A cover is placed over the noise reduction cavity, creating a sealed area isolated from the airflow. In this sealed area, the air inside the noise reduction cavity is relatively still, forming an airflow buffer zone. Therefore, when airflow noise propagates to the interface of the noise reduction cavity, due to the presence of this airflow buffer zone, the noise is reflected back into the inner cavity, confining most of the noise within the cavity and preventing it from effectively propagating outwards, thus significantly reducing the noise transmitted to the outside. Therefore, this technical solution achieves highly efficient noise reduction by blocking the noise propagation path through the noise reduction cavity.

[0016] Secondly, the air outlet device with the noise reduction duct structure using this technical solution can effectively reduce noise when the airflow generated by the high-speed rotation of the impeller reaches the air outlet. The noise generated by the airflow can be reflected back into the inner cavity by the noise reduction cavity and cannot be transmitted to the outside.

[0017] Thirdly, a device, such as an air purifier, when it adopts the aforementioned noise reduction duct structure or is directly equipped with an air outlet device using the duct structure, can effectively isolate the airflow noise generated during normal operation of the device through the noise reduction cavity of the duct structure, significantly reducing the noise transmitted from the device to the external environment, and ultimately achieving the effect of quiet operation of the device. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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.

[0020] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 This is a structural diagram of a noise reduction duct structure provided in an embodiment of this application; Figure 2 A top view of a noise reduction duct structure provided in an embodiment of this application; Figure 3 This is a schematic diagram showing the positions of the cover and the inner cavity in an explosion. Figure 4 This is a structural diagram of the second embodiment of the air duct structure; Figure 5 This is a structural diagram of the third embodiment of the air duct structure; Figure 6 This is a diagram showing the structural arrangement of the first and second steps.

[0022] Explanation of reference numerals in the attached figures: 1. Outer shell; 11. Air inlet; 12. Inner cavity; 13. Air outlet; 14. Opening; 15. Noise reduction cavity; 16. First step; 17. First flange; 18. Air duct; 2. Guide ribs; 3. Cover; 31. Second step; 32. Second flange; 4. Mounting bracket; 5. Wind turbine. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0025] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0026] In order to solve the technical problem of high noise during operation of existing home appliances, this application provides a noise reduction duct structure 18, which can reduce the noise generated during operation of home appliances.

[0027] like Figure 1 and Figure 2As shown, a noise reduction duct structure 18 includes: a shell 1 having a hollow inner cavity 12, an air inlet 11 on one side of the inner cavity 12 and an air outlet 13 on the other side; an opening 14 in the inner cavity 12 in the coaxial direction of the air inlet 11; a noise reduction cavity 15 near the air outlet 13, the opening of the noise reduction cavity 15 being in the same direction as the opening 14; and a cover 3 covering the opening 14 and simultaneously sealing the opening of the noise reduction cavity 15.

[0028] In one specific embodiment, such as Figure 2 The air outlet device shown includes the noise reduction duct 18 structure described above, a fan 5 disposed in the inner cavity 12, a motor driving the fan 5 to rotate, and a mounting frame 4. The mounting frame 4 is horizontally mounted at the air inlet 11, the motor is installed inside the mounting frame 4, and the opening 14 of the inner cavity 12 is coaxially arranged with the air inlet 11, while the air outlet 13 is arranged perpendicularly to the air inlet 11. The outer periphery of the fan 5 and the inner wall of the outer casing 1 form the air duct 18, one end of which is connected to the air inlet 11, and the other end is connected to the air outlet 13 to form a complete airflow channel. When the motor drives the impeller 5 to rotate, it breaks the air pressure balance between the outside of the outer shell 1 and the inner cavity 12. The rotation of the impeller 5 causes the air pressure in the inner cavity 12 to be lower than the air pressure outside the outer shell 1. Therefore, the external airflow rushes into the inner cavity 12 from the air inlet 11 and flows to the air duct 18 under the guidance of the rotation of the impeller 5. Then, it flows along the direction of the air duct 18 and finally flows to the air outlet 13, completing the entire airflow transportation process.

[0029] It should be noted that when the airflow reaches the air outlet 13, the interface at the air outlet 13 widens, and the friction between the airflow and the inner wall of the air outlet 13 generates vortex noise. To block the outward propagation of this vortex noise, this technical solution provides a noise reduction cavity 15 at the air outlet 13. The airflow buffer area formed by the noise reduction cavity 15 allows the airflow passing through the noise reduction cavity to be reflected into the inner cavity by the airflow buffer area, thereby reducing noise. In particular, this allows the equipment with this air duct 18 structure to exhibit a quiet operation, thereby improving the user experience.

[0030] Detailed, such as Figure 2 and Figure 3As described above, a noise reduction cavity 15 is provided near the air outlet 13. The opening of the noise reduction cavity 15 faces the same direction as the open 14. When the cover 3 is placed on the open 14, the cover 3 also closes the opening of the noise reduction cavity 15, forming a sealed space in this area. At this time, the air inside the noise reduction cavity 15 is relatively still, forming an airflow buffer area. Therefore, when airflow noise propagates to the interface of the noise reduction cavity 15, due to the existence of this airflow buffer area, the noise is reflected back into the inner cavity 12 and cannot effectively propagate outward, thereby significantly reducing the noise transmitted to the outside and achieving the purpose of noise reduction.

[0031] In a specific embodiment, such as Figure 2 As shown, the noise reduction cavity 15 is formed by the inner wall of the outer shell 1 and a guide rib 2, and the guide rib 2 extends integrally from the inner wall of the outer shell 1; at least one noise reduction cavity 15 is provided on one or both sides of the air outlet 13.

[0032] In this embodiment, the guide rib 2 is integrally formed with the inner wall of the outer shell 1, which facilitates the generation of the noise reduction cavity 15 during production.

[0033] In addition, to further improve the noise reduction effect, at least one noise reduction cavity 15 can be provided on one or both sides of the air outlet 13. For example, in Figure 2 In the embodiment shown, a noise reduction cavity 15 is provided on each side of the air outlet 13, so that the noise generated by the airflow flowing through the air outlet 13 can be reflected back into the inner cavity 12 on both sides at the same time, thereby effectively reducing the outward propagation of noise.

[0034] The number and location of the noise reduction cavities 15 can be configured according to the actual noise distribution. Experiments have shown that the vortex noise generated by the abrupt change in airflow cross-section near the air outlet 13 is the most significant; therefore, concentrating the noise reduction cavities 15 in this area can achieve a noise reduction effect. In other optional embodiments, the arrangement of the noise reduction cavities 15 can be flexibly adjusted according to the location of the vortex sound source in the specific product to achieve precise and efficient noise reduction.

[0035] exist Figure 2 In the illustrated embodiment, the noise reduction cavity 15 is disposed within the inner cavity 12. Specifically, the noise reduction cavity 15 is disposed inside the air outlet 13, that is, inside the inner cavity 12. In addition, as... Figure 4As shown, the noise reduction cavity 15 can also be disposed outside the inner cavity 12, for example, on the outer wall of the inner cavity 12. It should be noted that when the noise reduction cavity 15 is disposed on the outer wall of the inner cavity 12, its opening is still within the range of the opening 14 of the outer shell 1. When the cover 3 is closed, it must simultaneously cover both the opening of the inner cavity 12 and the opening of the noise reduction cavity 15, thereby ensuring that the noise reduction cavity 15 remains sealed while closing the opening 14. This structure effectively isolates noise inside the inner cavity 12, thereby achieving the effect of sound reduction.

[0036] To achieve better noise reduction and soundproofing effects for the air duct 18, in another embodiment, such as... Figure 5 As shown, the noise reduction cavity 15 is arranged along the outer peripheral edge of the inner cavity 12. It should be understood that by arranging the noise reduction cavities 15 continuously or intermittently along the outer peripheral edge, an acoustic impedance matching barrier is formed in the main area where the airflow interacts with the wall of the duct 18. For example... Figure 5 As shown, noise reduction cavities 15 are continuously arranged along the outer periphery of the inner cavity 12. When airflow noise propagates along the wall of the duct 18, the sound waves encounter the airflow buffer area generated by the noise reduction cavities 15, causing the noise to be reflected back into the inner cavity 12 and unable to be transmitted to the outside of the inner cavity 12. This structure not only achieves coordinated control of noise across the entire duct 18, avoiding the limitations of local noise reduction, but also maximizes the noise reduction effect area within a limited space. In addition, it maintains the smoothness of the airflow core area, maximizing the aerodynamic performance of the duct 18 while reducing noise.

[0037] It should be further explained that in the embodiment where the noise reduction cavities 15 are arranged along the outer periphery of the inner cavity 12, the projected outline of the cover 3 in the direction perpendicular to the opening 14 must completely cover the opening of the inner cavity 12 and the openings of all the noise reduction cavities 15. This ensures that a reliable seal can be achieved on each noise reduction cavity 15 simultaneously when the cover is closed, so that the airflow inside the noise reduction cavity 15 is inconsistent with the airflow in the air duct 18. It should be understood that when the turbulent airflow at the air outlet 13 impacts the noise reduction cavity 15, the internal air pressure of the noise reduction cavity 15 will be lower than the air pressure at the air outlet 13 because the noise reduction cavity 15 is sealed. At this time, the noise reduction cavity 15 is equivalent to an elastic airflow buffer zone. The turbulent airflow at the air outlet 13 will be effectively buffered at the buffer zone, changing from a turbulent state to a gentle state, ultimately achieving the effect of noise reduction.

[0038] Furthermore, in order to maximize the cross-sectional area of ​​the noise reduction cavity 15 within the confined space of the air duct 18 structure, thereby achieving better sound reduction and noise cancellation effects, in one specific embodiment, the cross-section of the noise reduction cavity 15 is triangular or parallelogram-shaped.

[0039] It should be understood that these two polygonal structures not only make full use of the corner area between the inner wall of the air duct 18 and the guide rib 2, but also provide a larger air chamber volume with the triangular and parallelogram cross-sections within the same space, resulting in a longer and larger airflow buffer area. While ensuring the overall compactness of the air duct 18 structure, this design significantly improves the isolation of the noise reduction cavity 15 through geometric optimization, maximizing the noise reduction effect within a limited space.

[0040] In addition, sound-absorbing cotton can be filled into the noise reduction cavity 15. The sound-absorbing cotton can absorb noise through its own physical properties. With the combined effect of the sound-absorbing cotton and the noise reduction cavity 15, better sound reduction and noise reduction can be achieved. In summary, the noise reduction cavity 15 effectively isolates noise within the inner cavity 12. However, the noise reduction cavity 15 needs to be located in a sealed area to form an airflow buffer zone. To maintain the sealing effect of the noise reduction cavity 15, such as... Figure 6 As shown, along the height direction of the outer shell 1 and around the outer periphery of the opening 14, the inner wall of the outer shell 1 is provided with a first step 16 recessed towards the inside of the opening 14; the cover 3 has a second step 31 along its inner periphery on the side facing the outer shell 1, which is adapted to the first step 16; when closed, the first step 16 is embedded in the second step 31. This design structure achieves high-precision fitting between the two components through mechanical fitting, ensuring the sealing integrity of the noise reduction cavity 15 and providing the necessary working conditions for the acoustic impedance effect.

[0041] To achieve a tight seal between the cover 3 and the opening 14, several first flanges 17 are provided on the outer wall of the inner cavity 12. A second flange 32 is provided at the corresponding location on the outer periphery of the cover 3. The first flanges 17 and the second flanges 32 are coaxially arranged to form a coaxial hole. Fasteners such as screws are inserted into the coaxial hole to ensure a tight seal between the cover 3 and the opening 14, while also maintaining the airtightness of the noise reduction cavity 15. It should be understood that this design prevents the cover 3 from detaching from the opening 14 due to airflow generated by the impeller 5 during prolonged use.

[0042] When the air duct structure 18 or air outlet device described above is applied to equipment, such as an air purifier, the air purifier adopts the above-mentioned noise reduction air duct structure 18, or directly uses the air outlet device of the air duct structure 18. During normal operation of the equipment, the airflow noise generated can be effectively isolated in the inner cavity 12 through the noise reduction cavity 15 of the air duct structure 18. The principle of the noise reduction cavity 15 effectively isolating noise has been explained in detail above and will not be described again here. Applying the air duct structure 18 or air outlet device described above to equipment can significantly reduce the noise transmitted by the equipment to the external environment, and ultimately achieve the effect of quiet operation of the equipment.

[0043] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0044] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0049] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0050] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A noise reduction duct structure, characterized in that, include: The outer casing has a hollow inner cavity, and the inner cavity is provided with an air outlet; The inner cavity has an opening away from the air outlet, and a noise reduction cavity is provided in the area near the air outlet, with the opening of the noise reduction cavity facing the same direction as the opening; It also includes a cover that covers the opening and simultaneously seals the opening of the noise reduction cavity.

2. The noise reduction duct structure according to claim 1, characterized in that: The noise reduction cavity is formed by the inner wall of the outer shell and a guide rib, and the guide rib extends integrally from the inner wall of the outer shell; At least one noise reduction cavity is provided on one or both sides of the air outlet.

3. The noise reduction duct structure according to claim 1, characterized in that: The noise reduction cavity includes a cavity disposed inside the inner cavity.

4. The noise reduction duct structure according to claim 1, characterized in that: The noise reduction cavity is provided along the outer periphery of the inner cavity.

5. The noise reduction duct structure according to claim 1, characterized in that: The cross-section of the noise reduction cavity is triangular or parallelogram.

6. The noise reduction duct structure according to claim 1, characterized in that: It includes sound-absorbing cotton, which is at least partially filled in the noise reduction cavity.

7. The noise reduction duct structure according to claim 1, characterized in that: Along the height direction of the outer shell and around the outer periphery of the opening, the inner wall of the outer shell is provided with a first step that is recessed inward toward the opening; The cover has a second step along its inner circumference on the side facing the outer shell, which is adapted to the first step. When closed, the first step is embedded within the second step.

8. An air outlet device, characterized in that, The air duct structure includes any one of claims 1-7, wherein the inner cavity is further connected to an air inlet; It also includes a wind turbine disposed in the inner cavity and a motor for driving the wind turbine to rotate; The mounting bracket is horizontally mounted at the air inlet, and the motor is installed inside the mounting bracket.

9. The air outlet device according to claim 8, characterized in that: An air duct is formed between the outer periphery of the wind turbine and the inner wall of the outer casing, and the air duct is connected to the air outlet.

10. An air outlet device, characterized in that: The duct structure for noise reduction and soundproofing as described in any one of claims 1-7 or the air outlet device as described in any one of claims 8-9.

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