Noise reduction shell of energy-saving air conditioner and air conditioner

Abstract

The invention discloses a noise reduction shell of an energy-saving air conditioner and the air conditioner, and relates to the technical field of air conditioner noise elimination. The noise reduction shell comprises a shell body and a noise elimination assembly arranged in the shell body. The noise elimination assembly is of a multi-layer coupling structure and sequentially comprises a sawtooth grid, an arc-shaped diffusion net and a honeycomb layer from the noise source side. The sawtooth grid is composed of non-parallel sawtooth sheets so as to crush vortexes; the arc-shaped diffusion net is located in a static pressure cavity defined by the grating and the honeycomb layer and used for reconstructing a sound field and eliminating standing waves. The honeycomb layer is formed by connecting a straight-through unit and a curved-through unit with a built-in alternating separation blade in parallel, and phase modulation is achieved through a zigzag path difference. An outlet of the honeycomb layer and a heat dissipation opening in the noise reduction panel are arranged in a non-coaxial staggered mode, and a convergence cavity for hedging and colliding of sound waves is defined between the outlet of the honeycomb layer and the heat dissipation opening. The inner wall of the de-noising panel is provided with salient points which are distributed in an array mode to intercept residual sound energy. While efficient heat dissipation of the air conditioner is guaranteed, full-band deep noise elimination from high-frequency wind noise to low-frequency mechanical noise is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioner noise reduction technology, and particularly relates to a noise reduction shell of an energy-saving air conditioner and the air conditioner. BACKGROUND

[0002] With the popularization of air conditioning technology, users have higher requirements for the mute performance of air conditioner outdoor units. During the operation of the air conditioner outdoor unit, the noise sources are diverse and complex. First, the core power source, the compressor, produces strong mechanical vibration noise and low-frequency electromagnetic noise during operation due to the reciprocating motion of the internal piston, the high-speed rotation of the rotor and the action of electromagnetic force. At the same time, the exhaust process of the compressor is also accompanied by obvious pressure pulsation noise. Second, the fan blades cut the air during high-speed rotation to generate vortex shedding noise and turbulent flow noise. These noises not only propagate directly through the air, but also induce resonance of the machine shell panel, producing secondary structural noise.

[0003] At present, there are mainly two common means for reducing the noise of air conditioner outdoor units. One is to paste sound-absorbing cotton or soundproof felt on the inner wall of the compressor chamber or the machine shell. However, the air conditioner outdoor unit is long-term exposed to the outdoor environment and needs to withstand ultraviolet radiation, rain erosion and severe temperature alternation. As a kind of porous fiber material, the sound-absorbing cotton is prone to physical performance attenuation under the action of these environmental factors, resulting in material aging, pulverization, mildew and even falling off, thereby losing the original noise reduction function. In addition, the sound-absorbing cotton has very limited absorption effect on the low-frequency "hum" with longer wavelength. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a noise reduction shell without sound-absorbing material, which can cover all frequency bands for noise reduction and does not affect the heat dissipation efficiency.

[0005] The above technical purpose of the present application is achieved by the following technical scheme: a noise reduction shell of an energy-saving air conditioner, comprising: a shell body, the shell body comprising a noise reduction panel arranged opposite to a noise source, and a heat dissipation opening arranged on the noise reduction panel; and a noise reduction assembly arranged inside the shell body and located between the noise source and the noise reduction panel; the noise reduction assembly comprises a honeycomb layer, the honeycomb layer is composed of straight-through units and curved-through units, and the internal path of the curved-through units is longer than the internal path of the straight-through units; a gap is left between the honeycomb layer and the noise reduction panel and jointly defines a converging cavity, and the outlet axes of the units in the honeycomb layer and the axis of the heat dissipation opening are arranged in non-coaxial staggered arrangement.

[0006] Furthermore, the noise reduction component also includes a serrated grid disposed on the side of the honeycomb layer near the noise source. The serrated grid is composed of multiple thin sheets with serrated edges, and adjacent thin sheets are arranged in a non-parallel manner.

[0007] Furthermore, the noise reduction component also includes an arc-shaped diffusion mesh disposed between the sawtooth grid and the honeycomb layer, the arc-shaped diffusion mesh being a rigid mesh structure convex toward the noise source side; the sawtooth grid, the honeycomb layer, and the inner wall of the outer shell body are collectively defined as a static pressure cavity, and the arc-shaped diffusion mesh is located within the static pressure cavity.

[0008] Furthermore, the internal channel of the curved passage unit is provided with multiple baffles that are alternately arranged on the left and right, and the baffles block the internal channel of the curved passage unit into a "zigzag" path.

[0009] Furthermore, the honeycomb layer includes various types of curved passage units, and different types of curved passage units have different numbers of baffles inside to form acoustic propagation paths of different lengths.

[0010] Furthermore, the inner wall of the noise reduction panel is provided with a plurality of inwardly recessed or inwardly protruding protrusions, which are positioned toward the confluence cavity to interfere with the reflected sound field within the confluence cavity.

[0011] Furthermore, the protrusions are distributed in a non-uniform array on the inner wall of the noise reduction panel, and the protrusions at different locations have different depths or heights.

[0012] Furthermore, the heat dissipation vents extend through both the inner and outer sides of the noise reduction panel, and all heat dissipation vents are located outside the projection area of ​​the cell layer unit outlet.

[0013] Furthermore, the difference between the path length of the curved unit and the path length of the straight unit is configured to be half the center wavelength of the target noise, so as to achieve destructive interference.

[0014] The present invention also provides an air conditioner that includes the aforementioned noise-reducing housing.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves complete processing of sound waves from energy breaking, sound field reconstruction to phase modulation through a multi-level coupling design of sawtooth grid, arc diffuser and dual-path honeycomb layer. It utilizes the 180-degree phase difference destructive interference in the confluence cavity and various curved passage units set for different frequencies to achieve a full-band deep noise reduction effect from high-frequency wind noise to low-frequency mechanical noise.

[0016] 2. This invention forces sound wave reflection and collision through the non-coaxial staggered arrangement of the honeycomb layer unit outlet and heat dissipation port, and generates Helmholtz resonance by combining the convex structure distributed on the inner wall of the noise reduction panel, thereby intercepting residual sound waves and dissipating energy. At the same time, the fully rigid geometric topology structure avoids the performance degradation caused by the aging and shedding of traditional sound-absorbing materials, thus achieving a long-lasting noise reduction effect.

[0017] 3. This invention guides airflow smoothly through the static pressure chamber, the confluence chamber, and the heat dissipation holes with a high opening ratio, thereby achieving the effect of maintaining low wind resistance heat dissipation under complex noise reduction path and ensuring the energy-saving operation of the air conditioning system in noise reduction mode. Attached Figure Description

[0018] Figure 1 This is a three-dimensional cross-sectional view of the noise-reducing housing of an energy-saving air conditioner according to the present invention. Figure 2 This is a schematic diagram of the structure of the outer wall of the noise reduction panel in this invention; Figure 3 This is a schematic diagram of the structure of the inner wall of the noise reduction panel in this invention; Figure 4 This is a schematic diagram of the assembly of the noise reduction component and the noise reduction panel in this invention; Figure 5 This is a partially enlarged structural diagram of the sawtooth grid in this invention; Figure 6 This is a three-dimensional structural diagram of the arc-shaped diffusion network in this invention; Figure 7 This is a three-dimensional structural diagram of the honeycomb layer in this invention; Figure 8 This is a cross-sectional view of the straight-through unit and the curved-through unit within the honeycomb layer in this invention.

[0019] In the diagram: 1. Outer shell; 101. Noise reduction panel; 1011. Heat dissipation vent; 1012. Protrusion; 2. Noise reduction component; 201. Serrated grille; 202. Arc-shaped diffuser mesh; 203. Honeycomb layer; 2031. Straight-through unit; 2032. Curved-through unit; 2033. Baffle. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0022] 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed 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 invention according to the specific circumstances.

[0024] Reference Figures 1 to 8 This invention discloses a noise-reducing housing for an energy-saving air conditioner. It can be applied to the compressor compartment housing and condenser heat dissipation surface of the outdoor unit, as well as to the cross-flow fan outlet of the indoor unit, to eliminate mechanical and airflow noise. The housing body 1 is typically made of sheet metal or high-strength engineering plastic, forming a cavity to accommodate the noise-reducing component 2. A noise-reducing panel 101 is provided on the side facing the noise source. It should be noted that the noise-reducing panel 101 and the noise-reducing component 2 are not limited to a single plane of the housing body 1. Depending on the noise radiation direction of different air conditioner models, the above structures can be simultaneously provided on multiple sides of the housing body 1 to achieve all-around acoustic shielding.

[0025] As the sound waves propagate outward, they first encounter the sawtooth grid 201 in the noise reduction component 2. This sawtooth grid 201 is composed of multiple thin sheets arranged horizontally in parallel with a preset spacing, each sheet having serrated edges. When the high-speed airflow passes over the sawtooth edges, the large-scale detachment vortex is cut into multiple smaller vortices, reducing the self-excited wind noise generated by airflow pulsation. Adjacent sheets are designed to be non-parallel; through the differentiated tilt angles of each sheet, the sound waves undergo non-equiangular diffuse reflection between the grids, thus breaking the standing wave effect that easily occurs in parallel spaces. After passing through the grid, the sound waves enter the static pressure cavity formed by the sawtooth grid 201, the honeycomb layer 203, and the outer shell 1. This cavity serves as a sound energy buffer space to smooth the sound pressure distribution.

[0026] An arc-shaped diffusion mesh 202 is installed inside the static pressure cavity. This arc-shaped diffusion mesh 202 is a rigid iron mesh structure with a central bulge facing the noise source. After sound wave particles collide with the arc surface, they scatter in all directions due to the curvature. This scattering mechanism further weakens the directivity of the sound waves, allowing the sound energy to be uniformly coupled into the honeycomb layer 203 at the rear end. The honeycomb layer 203 is the key part for phase modulation in this invention. It is composed of alternating arrays of straight-through units 2031 and curved-through units 2032. The straight-through unit 2031 is a hollow tube, through which the sound wave passes with the shortest path, maintaining its original phase characteristics. The internal channel of the curved-through unit 2032 is equipped with multiple baffles 2033 arranged alternately on the left and right sides. These baffles 2033 force the sound wave particles to propagate along a zigzag path. From an acoustic point of view, the straight-through unit 2031 and the curved-through unit 2032 have significant differences in equivalent sound path and flow impedance. The sound wave undergoes multiple acoustic impedance abrupt changes and rematching processes when passing through this structure. This process causes some of the acoustic energy to be reflected, scattered, and redistributed at the unit boundaries, thereby further weakening the coherence of the sound waves.

[0027] By setting different numbers of baffles 2033 in different types of curved-through units 2032, the equivalent sound path length within each unit can be adjusted. Since curved-through units 2032 with multiple path lengths are arranged in parallel within the honeycomb layer 203, a distributed phase delay structure is actually formed, causing different frequency components to exhibit a decorrelated phase distribution in space. According to the principle of destructive interference, the path difference between the curved-through unit 2032 and the straight-through unit 2031 can be configured to approach half the target noise center wavelength, resulting in a phase difference of approximately 180 degrees between the two sound waves at the exit. The sound waves processed by the honeycomb layer 203 then enter the merging cavity, which is formed by the gap between the honeycomb layer 203 and the noise reduction panel 101. Within this cavity, sound waves with phase decorrelation or opposite phase characteristics collide, and the sound pressure fluctuations cancel each other out, thus creating a broadband energy attenuation effect within the merging cavity.

[0028] The heat dissipation vents 1011 on the noise reduction panel 101 have a ventilation and heat dissipation function. To prevent sound waves from directly exiting from the honeycomb layer outlet, the outlet axes of all honeycomb units are staggered with respect to the heat dissipation vents 1011 on the axis, meaning that the outlet of each honeycomb tube faces the solid wall area of ​​the noise reduction panel 101. This staggered arrangement does not simply block the sound wave propagation path, but rather extends the propagation time and number of reflections of the sound wave in the confluence cavity, allowing the sound wave to gradually dissipate its ordered energy during multiple phase reconstructions. The sound wave must undergo multiple reflections and path deflections in the confluence cavity to find its outlet, which significantly extends the residence time of the sound wave in the interference field and enhances the interference depth. Multiple inwardly recessed protrusions 1012 are also distributed on the inner wall of the noise reduction panel 101. These protrusions 1012, together with the confluence cavity, form a Helmholtz-like resonance-like sound energy capture structure, specifically designed to capture the residual low-frequency sound energy after interference. The sound waves undergo viscous friction with the air inside the recessed microcavity, ultimately converting the sound energy into a small amount of heat energy that is dissipated, ensuring that the airflow discharged from the heat dissipation port 1011 maintains an extremely low noise level.

[0029] The aforementioned structure is entirely based on a rigid spatial configuration and does not rely on easily dissipated materials such as sound-absorbing cotton. Therefore, it will not suffer from performance degradation or material shedding under long-term outdoor operation. Through the flow-guiding design of the static pressure chamber and the confluence chamber, deep noise reduction is achieved while ensuring the smoothness of the airflow for heat exchange in the air conditioner, reducing the system's back pressure, and thus achieving energy-saving effects.

[0030] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A noise-reducing housing for an energy-saving air conditioner, characterized in that, include: The outer casing (1) includes a noise reduction panel (101) facing the noise source, and the noise reduction panel (101) has a heat dissipation vent (1011); and The noise reduction component (2) is disposed inside the housing body (1) and located between the noise source and the noise reduction panel (101); The noise reduction component (2) includes a honeycomb layer (203), which is composed of a straight-through unit (2031) and a curved-through unit (2032), wherein the internal path of the curved-through unit (2032) is longer than the internal path of the straight-through unit (2031); The honeycomb layer (203) and the noise reduction panel (101) have a gap and are defined together as a confluence cavity. The outlet axis of each unit in the honeycomb layer (203) is non-coaxially misaligned with the axis of the heat dissipation port (1011).

2. The noise-reducing housing of an energy-saving air conditioner according to claim 1, characterized in that: The noise reduction component (2) also includes a sawtooth grid (201) disposed on the side of the honeycomb layer (203) near the noise source. The sawtooth grid (201) is composed of multiple thin sheets with sawtooth structures on the edges, and the adjacent thin sheets are arranged in a non-parallel manner.

3. The noise-reducing housing of an energy-saving air conditioner according to claim 2, characterized in that: The noise reduction component (2) further includes an arc-shaped diffusion mesh (202) disposed between the sawtooth grid (201) and the honeycomb layer (203). The arc-shaped diffusion mesh (202) is a rigid mesh structure convex to the noise source side. The sawtooth grid (201), the honeycomb layer (203) and the inner wall of the outer shell body (1) are collectively defined as a static pressure cavity, and the arc-shaped diffusion mesh (202) is located in the static pressure cavity.

4. The noise-reducing housing of an energy-saving air conditioner according to claim 1, characterized in that: The internal channel of the curved passage unit (2032) is provided with multiple baffles (2033) arranged alternately on the left and right, and the baffles (2033) block the internal channel of the curved passage unit (2032) into a "zigzag" path.

5. The noise-reducing housing of an energy-saving air conditioner according to claim 4, characterized in that: The honeycomb layer (203) includes various types of the curved passage units (2032), and different types of the curved passage units (2032) have different numbers of baffles (2033) inside to form acoustic propagation paths of different lengths.

6. The noise-reducing housing of an energy-saving air conditioner according to claim 1, characterized in that: The inner wall of the noise reduction panel (101) has a plurality of inwardly recessed or inwardly protruding protrusions (1012), which are arranged toward the confluence cavity to interfere with the reflected sound field in the confluence cavity.

7. The noise-reducing housing of an energy-saving air conditioner according to claim 6, characterized in that: The bumps (1012) are distributed in a non-uniform array on the inner wall of the noise reduction panel (101), and the bumps (1012) at different positions have different depths or heights.

8. The noise-reducing housing of an energy-saving air conditioner according to claim 1, characterized in that: The heat dissipation vent (1011) extends through both the inner and outer sides of the noise reduction panel (101), and all heat dissipation vents (1011) are located outside the projection area of ​​the cell layer (203) unit outlet.

9. The noise-reducing housing of an energy-saving air conditioner according to claim 5, characterized in that: The difference between the path length of the curved unit (2032) and the path length of the straight unit (2031) is configured to be half the center wavelength of the target noise to achieve destructive interference.

10. An air conditioner, characterized in that, The noise-reducing housing of an energy-saving air conditioner as described in any one of claims 1-9.

Images