Sound absorption device and air conditioner

Abstract

The invention discloses a sound absorption device and an air conditioner, and relates to the technical field of sound absorption structures, the sound absorption device comprises an air duct wall and a sound absorption structure, the air duct wall is provided with a first side face and a second side face which are opposite, the first side face faces an air duct, and the second side face is an irregular curved surface; the sound absorption structure comprises a plurality of resonant cavities and a plurality of communicating holes, the communicating holes penetrate through the first side face and the second side face, and the resonant cavities are formed in the side where the second side face is located and communicate with the air duct through the communicating holes. According to the technical scheme, the pneumatic noise of the air duct can be reduced.

Description

Technical Field

[0001] This invention relates to the field of sound-absorbing structure technology, and in particular to a sound-absorbing device and an air conditioner. Background Technology

[0002] Air conditioners, such as ducted air conditioners, typically have duct walls that are not perfectly smooth, which can generate significant aerodynamic noise during operation. Since ducted air conditioners are located in indoor spaces, this increased aerodynamic noise can significantly impact the user experience. Summary of the Invention

[0003] The main objective of this invention is to provide a sound-absorbing device and an air conditioner designed to reduce aerodynamic noise in air ducts.

[0004] To achieve the above objectives, the present invention provides a sound-absorbing device comprising:

[0005] The duct wall has a first side and a second side, the first side facing the duct, and the second side being an irregular curved surface; and

[0006] The sound-absorbing structure includes multiple resonant cavities and multiple connecting holes. The connecting holes penetrate the first side and the second side. The resonant cavities are located on the side of the second side and are connected to the air duct through the connecting holes.

[0007] In one embodiment, the sound-absorbing structure is constructed through an equivalent fitting step.

[0008] In one embodiment, the sound-absorbing device further includes an outer shell wall opposite to the duct wall, the outer shell wall having a third side facing the second side;

[0009] The equivalent fitting step includes:

[0010] A plurality of initial cavities are defined between the second side and the third side;

[0011] The initial cavity is equivalent to a cuboid-shaped parametric cavity;

[0012] The parameters of the connecting hole are designed for the parameter cavity to obtain the connecting hole parameters.

[0013] In one embodiment, the step of equivalencing the initial cavity to a parametric cavity of a cuboid includes:

[0014] Multiple sampling points are taken along the first direction on the second side, and the distance between two adjacent sampling points is L. Res ;

[0015] A resampled surface with continuous curvature that passes through all the sampling points is obtained by fitting;

[0016] Four side boundary surfaces extend from the resampling surface toward the third side surface, which are connected end to end and intersect; wherein, the endpoint of any side boundary surface on the resampling surface is the sampling point;

[0017] The four side boundary surfaces, together with the second side surface and the third side surface, together enclose an initial cavity;

[0018] Construct a rectangular parallelepiped-shaped parametric cavity, wherein the cross-section of the parametric cavity has a side length of L. Res It is a square shape, and its volume is equal to that of the initial cavity.

[0019] In one embodiment, if the curvature of the resampled surface is positive or negative throughout its entirety, the step of extending four sequentially connected and intersecting side boundary surfaces from the resampled surface toward the third side surface includes:

[0020] Draw a reference line from all sampling points toward the third side surface, wherein the angle between the reference line and the vertical line of the resampling surface at the sampling point is less than or equal to 10°.

[0021] An interpolation surface is constructed between two adjacent reference lines, and the interpolation surface is configured as the side boundary surface.

[0022] In one embodiment, if the curvature of the resampled surface is partially positive and partially negative, then the step of extending four sequentially connected and intersecting side boundary surfaces from the resampled surface toward the third side surface includes:

[0023] Construct a fitting plane for the resampled surface such that the square of the volume of the entity obtained by projecting the resampled surface perpendicularly onto the fitting plane is minimized.

[0024] Connect all sampling points in pairs to obtain a square topological grid;

[0025] The square topological mesh is extended toward the third side along a direction perpendicular to the fitting plane to form a plurality of pipes with square cross-sections, the pipe walls of which are configured as the side boundary surfaces.

[0026] In one embodiment, the same resonant cavity is provided with x. n There are connected holes, 1 ≤ x n ≤9.

[0027] In one embodiment, at least one of the resonant cavities is provided with a plurality of connecting holes, and the apertures of the plurality of connecting holes are configured to be the same or different.

[0028] In one embodiment, the impedance characteristics of at least two of the resonant cavities are set to be different.

[0029] The present invention also proposes an air conditioner including the aforementioned sound-absorbing device.

[0030] In one embodiment, the air conditioner includes an indoor-side air duct, and the duct wall of the sound-absorbing device is configured as at least a portion of the inner cavity wall of the indoor-side air duct.

[0031] In one embodiment, the air conditioner further includes a heat exchanger disposed in the indoor side air duct, the inner wall of the indoor side air duct including a first plate portion disposed above the heat exchanger, the first plate portion being provided with the sound-absorbing device.

[0032] In one embodiment, the inner wall of the indoor side air duct further includes a second plate portion disposed below the heat exchanger, and the second plate portion is provided with the sound-absorbing device.

[0033] In one embodiment, the inner surface of the second plate is provided with a water storage tank corresponding to the heat exchanger, and at least a portion of the connecting holes of the second plate are provided on the bottom surface of the water storage tank and covered with a waterproof membrane.

[0034] In one embodiment, in the air outlet direction, the first plate portion includes at least two intersecting planar plate segments, and at least the planar plate segment near the air outlet extends outward at an angle in the direction near the first plate portion; and / or, the second plate portion includes at least two intersecting planar plate segments, and at least the planar plate segment near the air outlet extends outward at an angle in the direction near the first plate portion.

[0035] The technical solution of this invention employs multiple resonant cavities as a sound-absorbing structure. When the inner wall of the air duct is covered with this sound-absorbing device, some of the sound waves generated by the airflow passing through the air duct will propagate into the resonant cavities and have their sound energy dissipated within them, thereby reducing the aerodynamic noise. In particular, when the air duct of an air conditioner is located in an indoor space, it can significantly improve the user experience of the equipment. Attached Figure Description

[0036] 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, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 A schematic diagram of the structure of the first embodiment of the sound-absorbing device provided by the present invention;

[0038] Figure 2 for Figure 1 Top view of the embodiment shown;

[0039] Figure 3 for Figure 1 The front view of the embodiment shown;

[0040] Figure 4 for Figure 2 Sectional view at point AA;

[0041] Figure 5 A schematic diagram of a model for constructing cavity units between finite and infinite arbitrary surfaces in the design method provided by the present invention;

[0042] Figure 6 This is a schematic diagram of a model for constructing a cuboid cavity in the design method provided by the present invention;

[0043] Figure 7 This is a schematic diagram of the structure of the second embodiment of the sound-absorbing device provided by the present invention;

[0044] Figure 8 for Figure 7 Top view of the embodiment shown;

[0045] Figure 9 for Figure 7 The front view of the embodiment shown;

[0046] Figure 10 This is a cross-sectional view of an embodiment of the air conditioner provided by the present invention.

[0047] Explanation of icon numbers:

[0048] 10. Air duct wall; 11. First side view; 12. Second side view;

[0049] 20. Sound-absorbing structure; 21. Resonance cavity; 22. Connecting hole;

[0050] 30. Air conditioner; 31. Indoor air duct; 311. First panel; 312. Second panel; 313. Water tank; 314. Air outlet; 32. Heat exchanger; 33. Fan;

[0051] 40. Outer shell wall; 41. Third side.

[0052] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0054] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0055] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0056] Air conditioners, such as ducted air conditioners, typically have inner walls that are not perfectly smooth, which can generate significant aerodynamic noise during operation. Since ducted air conditioners are located in indoor spaces, this increased aerodynamic noise can significantly impact the user experience.

[0057] In view of this, the present invention proposes a sound-absorbing device that can improve the aerodynamic noise problem of air ducts.

[0058] Please see Figures 1 to 4 In one embodiment of the present invention, the sound-absorbing device includes:

[0059] The air duct wall 10 has a first side 11 and a second side 12 facing each other. The first side 11 faces the air duct, and the second side 11 is an irregular curved surface.

[0060] The sound-absorbing structure 20 includes multiple resonant cavities 21 and multiple connecting holes 22. The connecting holes 22 penetrate through the first side 11 and the second side 12. The resonant cavities 21 are located on the side where the second side 12 is located and are connected to the air duct through the connecting holes 22.

[0061] The technical solution of this invention employs multiple resonant cavities 21 as sound-absorbing structures 20. When the inner wall of the air duct is equipped with this sound-absorbing device (the first side 11 is located on the inner wall of the air duct), part of the sound waves of the aerodynamic noise generated by the airflow passing through the indoor side air duct 31 will propagate into the resonant cavity 21 and be dissipated within the resonant cavity 21, thereby reducing the aerodynamic noise. In particular, when the air duct of the air conditioner is located in an indoor space, it can significantly improve the user experience of the equipment.

[0062] It should be noted that the duct wall 10 is typically a thin-walled structure with uniform or nearly uniform wall thickness, meaning that the first side 11 and the second side 12 are parallel or nearly parallel. Therefore, when the second side 12 is an irregular curved surface, the first side 11 will also be an irregular curved surface.

[0063] Secondly, the term "irregular surface" in this embodiment of the invention is used in a broad sense. It includes surfaces that have no symmetry, axial symmetry, or planar symmetry in three-dimensional space, as well as surface structures formed by the intersection of at least two regular planes, or surface structures formed by the intersection of at least one regular plane and at least one regular surface, or surface structures formed by the intersection of at least two regular surfaces. The term "intersection" includes two plane segments that are connected and intersect, or two plane segments that are spaced apart and whose planes intersect.

[0064] Generally speaking, the internal structure of air conditioners typically lacks regular, flat surfaces suitable for sound absorption, and there is limited space to arrange sound-absorbing structures with regular geometric shapes. This is especially true on the inner walls of the fan ducts, where most surfaces with potential for noise reduction are irregular curves. Furthermore, the connection between the duct walls and the external structure (such as the fan casing) is complex and varied, leaving only irregularly shaped geometric spaces for designing sound-absorbing structures. These limitations pose significant challenges to the design and application of sound-absorbing structures on complex and varied structural components.

[0065] In view of this, the present invention proposes an innovative sound-absorbing structure design method, that is, the above-mentioned sound-absorbing structure can be constructed by equivalent fitting steps, and a sound-absorbing structure that fits with two irregular curved surfaces can be designed between two arbitrary irregular curved surfaces, so that the sound-absorbing structure can be better integrated into complex and varied structural components.

[0066] It is understood that the equivalent fitting step of the present invention is applicable not only to the thin-walled structure described above, but also to the shell wall with uneven wall thickness. That is, the air duct wall 10 with the second side 12 being an irregular curved surface and the first side 11 being a regular plane or a regular curved surface can also be designed using the equivalent fitting step of the present invention.

[0067] Please refer to Figure 4 Optionally, the sound-absorbing device further includes an outer shell wall 40 opposite to the duct wall, the outer shell wall having a third side wall 41 facing the second side wall 12; in one embodiment of the equivalent fitting step, the equivalent fitting step includes steps S10, S20 and S30:

[0068] S10: Define several initial cavities between the second and third sides;

[0069] S20: Equivalent to a cuboid parametric cavity in the initial cavity;

[0070] S30: Design the parameters of the connecting hole for the parameter cavity to obtain the connecting hole parameters.

[0071] Optionally, step S20 includes steps S21, S22 and S23.

[0072] S21: Take multiple sampling points along the first direction on the second side, with a distance L between two adjacent sampling points. Res ;

[0073] S22: Fitting to obtain a resampled surface that passes through all sampling points and has continuous curvature;

[0074] S23: The self-resampled surface extends toward the third side surface to form four side boundary surfaces that are connected end to end and intersect; wherein, the endpoints of any side boundary surface on the resampled surface are sampling points;

[0075] S24: The four side boundary surfaces, together with the second and third side surfaces, enclose an initial cavity;

[0076] S25: Construct a parametric cavity of a cuboid shape, the cross-section of which has a side length of L. Res It is a square shape, and its volume is equal to that of the initial cavity.

[0077] It should be noted that the curvature distribution of the fitted resampled surface has three cases: in the first case, the curvature of the entire resampled surface is positive over the entire domain; in the second case, the curvature of the entire resampled surface is negative over the entire domain; and in the third case, the curvature of the resampled surface is negative in some regions and positive in others. In the third case, a second fitting is required for the resampled surface, while in the first and second cases, a second fitting is not required.

[0078] Optionally, if the curvature of the resampled surface is positive or negative over the entire domain, then step S23 includes steps S231 and S232.

[0079] S231: Draw a reference line from all sampling points toward the third side, with the angle between the reference line and the vertical line of the resampling surface at the sampling point being less than or equal to 10°.

[0080] S232: Create an interpolation surface between two adjacent reference lines, and configure the interpolation surface as a side boundary surface.

[0081] Optionally, if the curvature of the resampled surface is positive in some regions and negative in others, then step S23 includes steps S231' and S232'.

[0082] S231': Construct a fitting plane for the resampled surface such that the square of the volume of the solid obtained by projecting the resampled surface perpendicularly onto the fitting plane is minimized.

[0083] S232': Connect all sampling points pairwise to obtain a square topological grid;

[0084] S233': Extend the square topological mesh toward the third side along a direction perpendicular to the fitting plane to form several pipes with square cross-sections, and configure the pipe walls as side boundary surfaces.

[0085] For example, establish a Cartesian coordinate system (xyz axes), a finite arbitrary surface, and an infinite arbitrary surface, which are at least partially non-intersecting, and the infinite arbitrary surface lies below the finite arbitrary surface in the z-axis direction.

[0086] For a finite arbitrary surface, perform a resolution of L Res Sampling (e.g., a square topological lattice, i.e., every linear distance L along the orthogonal first and second directions) Res Take a sampling point (or other sampling methods), and after sampling, perform surface fitting on the entire square topological lattice to obtain a smoother resampled surface than the original surface (i.e., a finite arbitrary surface).

[0087] In both the first and second sampling scenarios, lines (segments) are drawn from all sampling points toward the infinitely arbitrary surface, forming reference lines. The angle between these reference lines and the perpendicular line of the resampled surface at the sampling point is less than or equal to 10°. Interpolation surfaces are constructed between adjacent reference lines. These four interpolation surfaces, connected end-to-end and intersecting, together with the finite and infinitely arbitrary surfaces, enclose a cavity with a hexahedral topology. Thus, multiple cavity units with hexahedral topology as described above can be formed between the finite and infinitely arbitrary surfaces, and these hexahedral cavity units all follow a square topological lattice arrangement.

[0088] In the third sampling case, firstly, a fitting plane for the resampling surface is constructed, that is, the volume square value of the entity obtained by projecting the resampling surface perpendicularly onto the fitting plane is minimized; then, all sampling points are connected in pairs to obtain a square topological mesh; this square topological mesh is extended along a direction perpendicular to the fitting plane toward an infinite arbitrary surface to form several pipes with quadrilateral cross sections and square topological lattice arrangement; these square topologically arranged pipes, together with the finite arbitrary surface and the infinite arbitrary surface, enclose multiple cavity units with square topological lattice arrangement.

[0089] Furthermore, the separating surface (i.e., the side boundary surface) between two adjacent cavity units is given a thickness, that is, it is materialized as a thickness of t. s The wall, then t s The thickness of the sidewall of the cavity element is represented by t; a finite arbitrary surface is assigned a thickness, that is, it is materialized as a surface with a thickness of t. u The wall, then t u This represents the thickness of the upper wall of the cavity unit, i.e., the wall thickness of the sound-absorbing surface; assigning thickness to an infinitely arbitrary curved surface, that is, materializing it as a surface with a thickness of t. L The wall, then t L This indicates the thickness of the lower wall of the cavity unit. Thus, the cavity unit with each wall thickness corresponds to the basic cavity of the resonant cavity (without connecting holes), wherein the sidewall of the basic cavity extends along the extension direction of the side boundary surface.

[0090] Please refer to Figure 5 This is an example of a resampled surface in the first sampling case described above. Figure 5 The blue dot BL represents a sampling point on the second side, and the straight-line distance between two adjacent sampling points is L. Res The red dotted line represents the first intersection line FIL formed by the intersection of the resampling surface and the reference section (e.g., in the embodiment where the first direction is the X-axis, the reference section is the XZ plane). The purple curve represents the second intersection line SIL formed by the intersection of an infinitely arbitrary surface (i.e., the third side surface) and the reference section. The black curve represents the third intersection line TIL formed by the intersection of a finitely arbitrary surface (i.e., the second side surface) and the reference section. The green line segment GL represents the sidewall of the resonant cavity, and the orange line segment OL represents the wall of the opening of the resonant cavity or the wall of the insertion tube. Two adjacent green line segments, together with the purple curve and the red dotted line, constitute a quadrilateral-like irregularly shaped cavity. This quadrilateral-like cavity represents a resonant cavity, and the volume of a single resonant cavity is defined as V. n (n is the ordinal number of the resonant cavity).

[0091] Figure 5 In the embodiment shown, the space between the finite arbitrary surface and the infinite arbitrary surface is separated by green line segments to form four resonant cavities distributed in the first direction. The volumes of the four resonant cavities are V1, V2, V3 and V4, respectively.

[0092] Please refer to Figure 6 Construct a resonant cavity with a volume of V, identical to the aforementioned cavity. n A rectangular cavity with a square cross-section, the side length of which is L. Res (i.e., the sampling resolution L mentioned above) Res The height of the cuboid cavity is... It is understandable that when h n With L Res When the volumes are equal, the cuboid cavity is a cube cavity. Thus, each irregularly shaped cavity resembling a quadrilateral has a corresponding cuboid cavity (with equal volume), and these cuboid cavities have a consistent cross-sectional shape. These cuboid cavities are arranged in a compact square topological array, with one end aligned during the arrangement. This aligned end face forms a plane, which is defined as the sound-absorbing surface d.

[0093] It is understandable that, based on the aforementioned cuboid cavity array, and given the side length and height of each cuboid cavity in the array, if the cavity array is required to have a sound-absorbing effect within a preset frequency range, this can be achieved by adjusting the number of connecting holes (created by drilling holes in the sound-absorbing surface or inserting tubes) x n Hole depth l ap,n and aperture d o,n These three geometric parameters are implemented. Where 1 ≤ x n ≤9,x n Indicates the number of connecting holes on a single resonant cavity; l ap,n This represents the average hole depth of all connecting holes on a single resonant cavity; d o,n This represents the average aperture of all connecting holes on a single resonant cavity.

[0094] Multiple resonant cavities constitute a complete sound-absorbing structure, and the acoustic impedance Z of this complete sound-absorbing structure satisfies the equation:

[0095]

[0096] Among them, Z HH This represents the acoustic impedance of a single resonant cavity.

[0097] The acoustic impedance of the single resonant cavity described above satisfies the following equation:

[0098]

[0099] Where A is the total area of ​​the sound-absorbing surface d, and S apLet represent the cross-sectional area of ​​the connecting hole in the current resonant cavity, ρ0 be the air density, c0 be the speed of sound in air, γ be the specific heat capacity of air, η be the viscosity coefficient of air, j be the imaginary part of the complex number, and S be the density of air. ca k represents the area of ​​the square cross-section of the cavity. ap Ψ va and Ψ ha Let ω represent the wavenumber, viscosity, and thermal terms of the annular aperture under narrow acoustic conditions, respectively; ω be the noise angular frequency; δ be the acoustic quality correction factor; τ be the acoustic capacitance correction factor; x be the number of annular apertures on the current resonant cavity; and ρ be the sound quality correction factor. ca c ca and k ca These represent the air density, sound speed, and wave number inside the cavity, respectively.

[0100] Next, using an optimization algorithm, the number of interconnecting holes x in the cuboid cavity array is determined. n Hole depth l ap,n and aperture d o,n The optimal or best solution is found so that the acoustic impedance Z achieves the best match with the air impedance within the preset frequency range (target frequency range), thereby obtaining the best sound absorption effect.

[0101] Then, based on the number of holes x in the aforementioned cuboid cavity array... n Hole depth l ap,n and aperture d o,n The optimal or best solution is to design the connecting holes on the side of the initial irregularly shaped cavity array (e.g., the hexahedral topological cavity array in the first sampling case) that connects to the finite arbitrary curved surface, i.e., the sound-absorbing surface. Specifically, the number, depth, and diameter of the connecting holes in this irregularly shaped cavity array are x times the number of connecting holes in the corresponding cuboid cavity array. n Hole depth l ap,n and aperture d o,n The design is consistent. For example, the number, depth, and diameter of the connecting holes of the first resonant cavity V1 on the cuboid cavity array and the first resonant cavity V1 on the irregularly shaped cavity array are designed to be consistent; the number, depth, and diameter of the connecting holes of the second resonant cavity V2 on the cuboid cavity array and the second resonant cavity V2 on the irregularly shaped cavity array are designed to be consistent; and so on.

[0102] After the aforementioned through-hole design, the impedance characteristics of any irregularly shaped cavity array on a finite arbitrary curved surface are almost identical to the impedance characteristics of the corresponding rectangular cavity on the sound-absorbing plane. Therefore, the impedance characteristics of the entire irregularly shaped cavity array on a finite arbitrary curved surface are also almost identical to the impedance characteristics of the cuboid cavity array on the sound-absorbing plane. This results in the irregularly shaped cavity array achieving the expected sound absorption effect within the target frequency range, with its geometric parameters approaching optimality.

[0103] It should be noted that, since the surface of the finite arbitrary curved surface (i.e., the second side surface 11) is not necessarily flat, the depth of the connecting hole 22 provided on it will vary radially. In this case, the hole depth can be taken as the average value of all depths of the connecting hole 22. Secondly, the axis of the connecting hole 22 is set parallel to the reference connection line, that is, the angle between the axis of the connecting hole 22 and the perpendicular line of the fitting plane at that point is less than or equal to 10°.

[0104] It is understood that the inherent logic of the above-described design method of the present invention lies in the fact that, when the cavity volume remains constant, changes in the cavity shape of the Helmholtz resonator will not significantly alter its equivalent acoustic volume and equivalent acoustic mass within a certain range. In other words, changing only the cavity shape without changing the cavity volume will not significantly affect the impedance characteristics of the Helmholtz resonator. Therefore, to simplify mathematical modeling, the irregularly shaped cavity is approximated as a cuboid cavity. Geometric parameters are optimized using mature theories, and after optimization, the optimized geometric features are transferred back to the irregularly shaped cavity.

[0105] The above-mentioned design method of the present invention can design a sound-absorbing structure 20 that fits perfectly between two arbitrary curved surfaces, so that the sound-absorbing structure 20 can be integrated into complex and varied structural components, greatly expanding the application scenarios of the sound-absorbing structure 20, especially suitable for air ducts with irregular curved surfaces.

[0106] Of course, other existing design methods can also be used to obtain the structural parameters of the resonant cavity 21, including the use of other acoustic impedance calculation formulas. This application does not make any specific limitations on this.

[0107] To make the above design method more reasonable, in one embodiment, the distance between two adjacent sampling points is L. Res 10mm < L Res <40mm. L Res In other words, the sampling resolution is too large. If the sampling resolution is too large, the fitting degree of the resampled surface to the finite arbitrary surface (i.e., the second side) will not be high. If the sampling resolution is too small, the number of cavities in the irregularly shaped cavity array will be too large, which will significantly increase the workload of subsequent optimization calculation steps.

[0108] In one embodiment, the resonant cavity 21 is configured as a Helmholtz resonator. This results in a simple structure that effectively absorbs and reduces noise within a certain frequency range. Of course, in other embodiments, other structural forms of the resonant cavity 21 can also be used.

[0109] Optionally, the cross-sectional shape of the connecting hole 22 can be a regular shape, such as a circle, triangle, or rectangle, or a regular annular hole, such as a circular annular slit, or an irregular shape. This application does not specifically limit this. The circular annular slit can be formed by two separate sub-shell walls. For example, one sub-shell wall has a circular hole, and the other sub-shell wall has a cylindrical protrusion corresponding to the circular hole. When the two sub-shell walls are joined to form the duct wall, the end of the cylindrical protrusion extends into the circular hole, and the cylindrical surface of the cylindrical protrusion and the hole wall surface of the circular hole are spaced apart to form the circular annular slit. Of course, other structures can also be used to form the circular annular slit.

[0110] In one embodiment, the same resonant cavity 21 is provided with a corresponding connecting hole 22, 1≤x n ≤9. It is understandable that, on the one hand, if the number of connecting holes 22 in the same resonant cavity 21 is too large, it will significantly affect the structural strength of the duct wall 10 on the first side 11. On the other hand, if the number of connecting holes 22 in the same resonant cavity 21 is too small, and the diameter of a single connecting hole 22 is too large, the gas will lose too much kinetic energy when flowing through the first side 11.

[0111] Optionally, at least one resonant cavity 21 is provided with a plurality of connecting holes 22, and the apertures of the plurality of connecting holes 22 are configured to be the same or different. That is, at least some of the resonant cavities 21 have more than two connecting holes 22. In this way, while ensuring that the resonant cavities 21 have the same impedance characteristics, the aperture of a single connecting hole 22 can be reduced by increasing the number of connecting holes 22, which helps to reduce the kinetic energy lost by the gas when flowing through the first side 11.

[0112] Optionally, at least two resonant cavities 21 may have different impedance characteristics. In this way, the complete sound-absorbing structure 20 formed by all resonant cavities 21 can absorb aerodynamic noise waves over a wider frequency range, thereby improving the sound absorption effect. Of course, in other embodiments, all resonators may have the same impedance characteristics.

[0113] In one embodiment, the first side surface 11 is configured as an irregular curved surface and includes at least one planar segment, which is provided with a connecting hole 22 and a resonant cavity 21. That is, the sound-absorbing device of the present invention can be applied to an irregular curved surface structure having a planar segment. Optionally, the first side surface 11 includes at least two planar segments, which are arranged intersecting each other.

[0114] The axial direction of the connecting holes 22 can be flexibly designed according to the structure of the air duct wall 10. For example, in one embodiment, the axes of the connecting holes 22 on the same plane segment are arranged in parallel. It should be noted that parallel means parallel or nearly parallel. In this way, opening all the connecting holes 22 along the same direction on the same plane segment is beneficial to the manufacturing and forming of the connecting holes 22. For example, when the area of ​​the air duct wall 10 corresponding to the plane segment is an injection molding structure, all the connecting holes 22 can be formed in one step along the mold opening direction. Of course, in other embodiments, the axes of the connecting holes 22 on the same plane segment can also be at least partially intersecting. For example, the axes of some connecting holes 22 extend along the Z-axis direction, and the axes of other connecting holes 22 extend along the Y-axis direction.

[0115] In one embodiment, the axes of the connecting holes 22 on different planar segments are arranged in parallel. This embodiment is applicable when the air duct wall 10 regions corresponding to different planar segments are the same part; that is, the same part is formed into different planes (planar segments), and the connecting holes 22 on these planes (planar segments) are opened in the same direction, which is beneficial for the manufacturing and forming of the part. For example, when the part is an injection-molded structure, all connecting holes 22 can be formed in one step along the mold opening direction. Of course, even if the air duct wall 10 regions corresponding to different planar segments are different parts, the scheme of having the axes of the connecting holes 22 on different planar segments parallel can also be adopted.

[0116] Of course, in another embodiment, the axes of the connecting holes 22 on different planar segments can also be arranged to intersect. This embodiment is applicable when the areas of the duct wall 10 corresponding to different planar segments are different parts, that is, different parts are formed into different planes (planar segments), and the connecting holes 22 on these planes (planar segments) are opened in different directions, which is beneficial for the manufacturing and forming of the parts. For example, when these parts are injection molded structures, their respective connecting holes 22 are formed in one step along their mold opening direction. Of course, even if the areas of the duct wall 10 corresponding to different planar segments are the same part, the scheme of intersecting axes of the connecting holes 22 on different planar segments can also be adopted.

[0117] Please refer to Figure 10 The present invention also proposes an air conditioner that includes the aforementioned sound-absorbing device. The specific structure of the sound-absorbing device is as described in the above embodiments. Since the air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0118] It should be noted that the types of air conditioners in this invention include, but are not limited to, ducted air conditioners, wall-mounted air conditioners, integrated portable air conditioners, fresh air systems, and air purifiers.

[0119] In one embodiment, the air conditioner 30 includes a housing with an indoor air duct 31 inside, and the duct wall 10 of the sound-absorbing device is configured as at least a portion of the inner cavity wall of the indoor air duct 31. Of course, in other embodiments, the sound-absorbing device can also be applied to the outdoor air duct.

[0120] Please refer to Figures 1 to 4 , Figure 10 ,in, Figure 10 The first plate portion 311 in the middle corresponds to Figures 1 to 4 The structure of the sound-absorbing device embodiment shown, that is, the first plate portion 311 is Figures 1 to 4 The sound-absorbing device shown has an air duct wall 10, and the outer wall of the housing is... Figures 1 to 4 The sound-absorbing device shown includes an outer shell wall 40. In one embodiment, the air conditioner 30 further includes a heat exchanger 32 disposed within an indoor air duct 31. The inner wall of the indoor air duct 31 includes a first plate portion 311 disposed above the heat exchanger 32, and the first plate portion 311 is provided with a sound-absorbing device. It is understood that aerodynamic noise is generated when airflow passes through the heat exchanger 32. Therefore, providing a sound-absorbing device on the first plate portion 311 above the heat exchanger 32 can specifically improve the aerodynamic noise problem at this location. Of course, the sound-absorbing device can also be provided in the area of ​​the indoor air duct 31 corresponding to the lower or side position of the heat exchanger 32, or the sound-absorbing device can be provided only in the area of ​​the air outlet 314 of the indoor air duct 31.

[0121] Please refer to Figures 7 to 10 ,in, Figure 10 The second plate portion 312 in the middle corresponds to Figures 7 to 9 The structure of the sound-absorbing device embodiment shown, that is, the second plate portion 312 is Figures 7 to 9 The sound-absorbing device shown has an air duct wall 10, and the outer wall of the housing is... Figures 7 to 9 The sound-absorbing device shown includes an outer shell wall 40. To further improve the aerodynamic noise generated in the area where the heat exchanger 32 is located, in one embodiment, the inner wall of the indoor side air duct 31 further includes a second plate portion 312 located below the heat exchanger 32, and the second plate portion 312 is equipped with a sound-absorbing device. That is, the first plate portion 311 and the second plate portion 312 above and below the heat exchanger 32 work together to absorb sound, thereby further improving the aerodynamic noise generated in the area where the heat exchanger 32 is located.

[0122] It is easy to understand that the second plate 312, located below the heat exchanger 32, can utilize at least a portion of its structure as a drip tray to collect the condensate from the heat exchanger 32 (when the heat exchanger 32 is used as a condenser), thereby simplifying the structure of the indoor air duct 31. For example, please refer to... Figure 7 and Figure 10In one embodiment, the inner surface of the second plate portion 312 is provided with a water storage tank 313 corresponding to the heat exchanger 32. At least a portion of the connecting holes 22 of the second plate portion 312 are provided on the bottom surface of the water storage tank 313 and covered with a waterproof membrane (not shown in the drawings). Thus, the waterproof membrane prevents water in the water storage tank 313 from entering the resonant cavity 21, while aerodynamic noise can be transmitted into the resonant cavity 21 through the waterproof membrane, thereby simultaneously achieving the water storage function and sound absorption function of the water storage tank 313. Optionally, the waterproof membrane is a waterproof and breathable organic waterproof membrane. Of course, in other embodiments, the water storage tank 313 may not be provided on the second plate portion 312; for example, a water receiving tray may be added between the second plate portion 312 and the heat exchanger 32.

[0123] Please refer to Figure 10 In one embodiment, the distance between the first plate portion 311 and the second plate portion 312 gradually decreases in the direction toward the air outlet 314 of the indoor air duct 31. That is, one of the first plate portion 311 and the second plate portion 312 extends obliquely toward the other in the region near the air outlet 314. In this way, the obliquely extending wall surface of the indoor air duct 31 formed in the region of the air outlet 314 can reflect part of the aerodynamic noise sound waves back, so that the part of the noise sound waves can propagate again into the sound-absorbing structure 20 of the first plate portion 311 and the second plate portion 312, thereby further improving the sound absorption effect of the first plate portion 311 and the second plate portion 312. Secondly, the flow area of ​​the indoor air duct 31 can also be reduced at the air outlet 314, which is beneficial to increasing its airflow velocity.

[0124] In one embodiment, in the air outlet direction of the air outlet 314, the first plate portion 311 includes at least two intersecting planar plate segments, and at least the planar plate segment near the air outlet 314 extends outward at an angle in the direction near the first plate portion 311. Optionally in this embodiment, the second plate portion 312 includes at least two intersecting planar plate segments, and at least the planar plate segment near the air outlet 314 extends outward at an angle in the direction near the first plate portion 311. Of course, in other embodiments, only the first plate portion 311 or the second plate portion 312 may have planar plate segments.

[0125] Please refer to Figure 10 Furthermore, the air conditioner also includes a fan 33 located on the side of the heat exchanger 32 away from the air outlet 314. The fan 33 is used to direct the air in the indoor air duct 31 towards the air outlet 314. Optionally, in this embodiment, the fan 33 is configured as a cross-flow fan 33, and the number can be set to multiple, with the multiple cross-flow fans 33 distributed along the width direction of the air conditioner.

[0126] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sound-absorbing device, characterized in that, include: The air duct wall has a first side and a second side, the first side is facing the air duct, and the second side is an irregular curved surface; and The sound-absorbing structure includes multiple resonant cavities and multiple connecting holes. The connecting holes penetrate the first side and the second side. The resonant cavities are located on the side of the second side and are connected to the air duct through the connecting holes.

2. The sound-absorbing device as described in claim 1, characterized in that, The sound-absorbing structure is constructed through an equivalent fitting process.

3. The sound-absorbing device as described in claim 2, characterized in that, The sound-absorbing device also includes an outer shell wall opposite to the air duct wall, the outer shell wall having a third side facing the second side; The equivalent fitting step includes: A plurality of initial cavities are defined between the second side and the third side; The initial cavity is equivalent to a cuboid-shaped parametric cavity; The parameters of the connecting hole are designed for the parameter cavity to obtain the connecting hole parameters.

4. The sound-absorbing device as described in claim 3, characterized in that, The step of equivalencing the initial cavity to a cuboid parametric cavity includes: Multiple sampling points are taken along the first direction on the second side, and the distance between two adjacent sampling points is L. Res ; A resampled surface with continuous curvature that passes through all the sampling points is obtained by fitting; Four side boundary surfaces extend from the resampling surface toward the third side surface, which are connected end to end and intersect; wherein, the endpoint of any side boundary surface on the resampling surface is the sampling point; The four side boundary surfaces, together with the second side surface and the third side surface, together enclose an initial cavity; Construct a rectangular parallelepiped-shaped parametric cavity, wherein the cross-section of the parametric cavity has a side length of L. Res It is a square shape, and its volume is equal to that of the initial cavity.

5. The sound-absorbing device as described in claim 4, characterized in that, If the curvature of the resampled surface is positive or negative throughout its entirety, then the step of extending four sequentially connected and intersecting side boundary surfaces from the resampled surface toward the third side surface includes: Draw a reference line from all sampling points toward the third side surface, wherein the angle between the reference line and the vertical line of the resampling surface at the sampling point is less than or equal to 10°. An interpolation surface is constructed between two adjacent reference lines, and the interpolation surface is configured as the side boundary surface.

6. The sound-absorbing device as described in claim 4, characterized in that, If the curvature of the resampled surface is partially positive and partially negative, then the step of extending four sequentially connected and intersecting side boundary surfaces from the resampled surface toward the third side surface includes: Construct a fitting plane for the resampled surface such that the square of the volume of the entity obtained by projecting the resampled surface perpendicularly onto the fitting plane is minimized. Connect all sampling points in pairs to obtain a square topological grid; The square topological mesh is extended toward the third side along a direction perpendicular to the fitting plane to form a plurality of pipes with square cross-sections, the pipe walls of which are configured as the side boundary surfaces.

7. The sound-absorbing device as described in claim 1, characterized in that, The same resonant cavity is provided with x n There are connected holes, 1 ≤ x n ≤9.

8. The sound-absorbing device as described in claim 7, characterized in that, At least one of the resonant cavities is provided with a plurality of connecting holes, and the apertures of the plurality of connecting holes are configured to be the same or different.

9. The sound-absorbing device as claimed in claim 1, characterized in that, The impedance characteristics of at least two of the resonant cavities are set to be different.

10. An air conditioner, characterized in that, Includes the sound-absorbing device as described in any one of claims 1 to 9.

11. The air conditioner as claimed in claim 10, characterized in that, The air conditioner includes an indoor side air duct, and the duct wall of the sound-absorbing device is configured as at least a portion of the inner cavity wall of the indoor side air duct.

12. The air conditioner as described in claim 11, characterized in that, The air conditioner also includes a heat exchanger disposed in the indoor side air duct, and the inner wall of the indoor side air duct includes a first plate portion disposed above the heat exchanger, and the first plate portion is provided with the sound-absorbing device.

13. The air conditioner as described in claim 12, characterized in that, The inner wall of the indoor side air duct also includes a second plate portion located below the heat exchanger, and the second plate portion is provided with the sound-absorbing device.

14. The air conditioner as described in claim 13, characterized in that, The inner surface of the second plate is provided with a water storage tank corresponding to the heat exchanger, and at least part of the connecting holes of the second plate are provided on the bottom surface of the water storage tank and covered with a waterproof membrane.

15. The air conditioner as described in claim 13, characterized in that, In the air outlet direction, the first plate portion includes at least two intersecting planar plate segments, and at least the planar plate segment near the air outlet extends outward at an angle in the direction close to the first plate portion; And / or, the second plate portion includes at least two intersecting planar plate segments, at least the planar plate segment near the air outlet extending outward at an angle in the direction close to the first plate portion.

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