Noise reduction module and home appliance

Abstract

The application discloses a noise reduction module and household electrical appliances, wherein the noise reduction module comprises: an energy gathering piece, the energy gathering piece has opposite first and second sides, the energy gathering piece is provided with an energy gathering groove in a direction from the first side to the second side, the energy gathering groove is arranged in a tapering manner to be in an acoustic black hole shape, the energy gathering groove has a large-diameter end and a small-diameter end, the large-diameter end of the energy gathering groove is used for being directed to a noise source; and a damping piece, the damping piece is attached to the second side of the energy gathering piece and covers at least a position corresponding to the small-diameter end of the energy gathering groove on the second side of the energy gathering piece, so as to dissipate sound wave energy penetrating through the energy gathering piece. The technical scheme of the application effectively improves the noise reduction effect of the noise reduction module.

Description

Technical Field

[0001] This invention relates to the field of noise reduction technology, and in particular to a noise reduction module and a home appliance. Background Technology

[0002] Currently, most electrical appliances generate significant noise during operation. Taking gas water heaters as an example, their noise primarily originates from three sources: combustion noise, fan noise, and aerodynamic noise. Combustion noise is produced by the intense vibrations of the heated flue gas within the enclosed combustion chamber, resulting in a loud sound. Fan noise arises because the gas water heater requires continuous air supply during combustion, causing the fan to rotate continuously and resonate with the casing, thus generating mechanical noise. Aerodynamic noise is caused by pressure changes due to turbulence or variations in flow area. While fan noise can be reduced by optimizing the fan structure, aerodynamic and combustion noise are more difficult to reduce specifically. Furthermore, these low-frequency noises have strong penetrating power, making general noise reduction techniques less effective against them.

[0003] Therefore, improving the noise reduction effect of electrical equipment has become an urgent problem to be solved. Summary of the Invention

[0004] The main objective of this invention is to propose a noise reduction module that aims to improve the noise reduction effect of electrical equipment.

[0005] To achieve the above objectives, the noise reduction module proposed in this invention includes:

[0006] An energy-concentrating element has a first side and a second side facing each other. The energy-concentrating element has a tapering energy-concentrating groove extending from the first side to the second side, forming an acoustic black hole shape. The energy-concentrating groove has a large-diameter end and a small-diameter end, with the large-diameter end facing the noise source.

[0007] A damping element is attached to the second side of the energy-concentrating element and covers at least the position corresponding to the small-diameter end of the energy-concentrating groove on the second side of the energy-concentrating element, so as to dissipate the sound wave energy that penetrates the energy-concentrating element.

[0008] Optionally, the inner wall of the energy-concentrating groove from the first side to the second side is an arc-shaped convex surface facing the centerline of the energy-concentrating groove.

[0009] Optionally, the energy-concentrating groove is provided through the second side of the energy-concentrating element and forms one or more through openings, so that the acoustic energy collected by the energy-concentrating groove is transmitted to the damping element for dissipation.

[0010] Optionally, the through opening is a circular opening with a diameter of no more than 5 mm.

[0011] Optionally, the energy-concentrating element is plate-shaped, and there are multiple energy-concentrating slots arranged in an array on the plate-shaped energy-concentrating element.

[0012] Optionally, the damping element is disposed on the second side of the energy-concentrating element at the position corresponding to the small-diameter ends of the plurality of energy-concentrating slots; or,

[0013] There are multiple damping elements, and their number corresponds to the number of energy-concentrating slots. The damping elements are arranged one-to-one with the positions of the multiple energy-concentrating slots on the second side of each energy-concentrating element.

[0014] Optionally, the damping element is bonded to the second side of the energy-concentrating element.

[0015] Optionally, the energy-concentrating component is made of foam board, photosensitive resin, KT board, or rubber; and / or,

[0016] The damping component is made of neoprene rubber, epoxy resin, or asphalt.

[0017] Optionally, the sound velocity of the noise source, the diameter of the large-diameter end of the energy-concentrating groove, and the thickness of the energy-concentrating element satisfy the following formula;

[0018]

[0019]

[0020]

[0021] Among them, c b Let f be the sound velocity of the noise source, h be the sound frequency of the noise source, E be the thickness of the energy-concentrating element, ρ be the elastic modulus of the energy-concentrating element, γ be the Poisson's ratio of the energy-concentrating element, and D be the diameter of the large-diameter end of the energy-concentrating groove.

[0022] The present invention also proposes a household appliance, including a housing having a receiving cavity; a main body of the household appliance disposed within the receiving cavity of the housing; and a noise reduction module, the noise reduction module comprising:

[0023] An energy-concentrating element has a first side and a second side facing each other. The energy-concentrating element has a tapering energy-concentrating groove extending from the first side to the second side, forming an acoustic black hole shape. The energy-concentrating groove has a large-diameter end and a small-diameter end, with the large-diameter end facing the noise source.

[0024] A damping element is attached to the second side of the energy-concentrating element and covers at least the position corresponding to the small-diameter end of the energy-concentrating groove on the second side of the energy-concentrating element, so as to dissipate the sound wave energy that penetrates the energy-concentrating element.

[0025] The noise reduction module is attached to the inner wall of the housing, and the damping component of the noise reduction module is located between the energy-concentrating component of the noise reduction module and the inner wall of the housing, so as to block the noise generated by the main body of the home appliance from being transmitted to the outside of the housing.

[0026] Optionally, the housing has multiple inner walls, each of which is provided with the noise reduction module.

[0027] Optionally, the main body of the home appliance includes:

[0028] The burner has a first combustion chamber and a second combustion chamber connected in sequence.

[0029] A preheating burner is provided in the burner and is used to connect gas and air for combustion, so as to heat the air in the first combustion chamber to a preset temperature and deliver it to the second combustion chamber;

[0030] Gas injection assembly, the gas injection assembly being used to inject gas into the second combustion chamber to induce a high-temperature air combustion reaction within the second combustion chamber; and

[0031] A heat exchanger, wherein the heat exchanger is configured to exchange heat with the burner.

[0032] The energy-concentrating component of this invention has a first side and a second side. The energy-concentrating component has a tapering energy-concentrating groove, forming an acoustic black hole shape, extending from the first side to the second side. The energy-concentrating groove has a large-diameter end and a small-diameter end. The groove opening is located at the large-diameter end and faces the noise source to concentrate noise sound wave energy. A damping component, made of damping material, is positioned on the second side of the energy-concentrating component, covering the position corresponding to the small-diameter end of the energy-concentrating groove. When sound wave energy approaches the energy-concentrating component, it is concentrated at the large-diameter end of the energy-concentrating groove and propagates towards the small-diameter end. During propagation, due to the acoustic black hole effect, the sound velocity of the sound wave energy is reduced. The sound wave energy penetrates the energy-concentrating component and then passes through the damping component. Due to the damping material characteristics of the damping component, the sound wave energy is dissipated, further reducing the propagation distance of the sound wave energy. Compared to existing noise reduction technologies, this invention effectively improves the noise reduction effect of the noise reduction module. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a schematic diagram of the structure of an embodiment of the noise reduction module of the present invention;

[0035] Figure 2 This is a schematic diagram of another embodiment of the noise reduction module of the present invention;

[0036] Figure 3 This is a top view (section) of the burner in one embodiment of the present invention;

[0037] Figure 4 This is a side view (section) of the burner in one embodiment of the burner of the present invention.

[0038] Explanation of icon numbers:

[0039] label name label name 10 Concentrated energy components 13 Concentrated Energy Trough 11 First side 14 Large diameter end 12 Second side 15 Small diameter end 20 Damping components 16 Through 51 Preheating burner 52 First combustion chamber 53 Gas injection assembly 54 Second combustion chamber 55 nozzle

[0040] 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

[0041] 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.

[0042] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0043] 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. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. 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.

[0044] This invention proposes a noise reduction module.

[0045] In embodiments of the present invention, such as Figure 1 As shown, the noise reduction module includes:

[0046] An energy-concentrating element 10 has opposing first sides 11 and second sides 12. The energy-concentrating element 10 has a tapering energy-concentrating groove 13 extending from the first side 11 to the second side 12, forming an acoustic black hole shape. The energy-concentrating groove 13 has a large-diameter end 14 and a small-diameter end 15, with the large-diameter end 14 facing the noise source.

[0047] A damping element 20 is attached to the second side 12 of the energy focusing element 10 and covers at least the position corresponding to the small diameter end 15 of the energy focusing groove 13 on the second side 12 of the energy focusing element 10, so as to dissipate the sound wave energy that penetrates the energy focusing element 10.

[0048] In this embodiment, the energy-concentrating element 10 is used to block the propagation of noise. It is disposed around the noise source to reduce the propagation distance of the noise sound wave energy. Specifically, it can be plate-shaped, thus having two opposing plate surfaces, namely the aforementioned opposing first side 11 and second side 12. The energy-concentrating element 10 has an energy-concentrating groove 13 that is gradually narrowed and forms an acoustic black hole shape from the first side 11 toward the second side 12.

[0049] It's important to explain that sound waves passing through an acoustic black hole structure exhibit the acoustic black hole effect. The acoustic black hole (ABH) effect utilizes the gradient changes in the geometric or material properties of a thin-walled structure to gradually reduce the wave propagation speed within the structure. Ideally, the wave speed can be reduced to zero, thus eliminating reflection. The main method to achieve the acoustic black hole effect is to cut the thickness of the thin-plate structure according to a specific pattern. The acoustic black hole can then concentrate the wave energy propagating within the structure at a specific location. In practical applications, acoustic black holes offer advantages such as wide bandwidth efficiency, simple and flexible implementation methods, and significant benefits in vibration reduction, noise reduction, and energy recovery applications of thin-walled structures.

[0050] Meanwhile, the acoustic black hole-shaped energy-concentrating groove 13 has a large-diameter end 14 and a small-diameter end 15. The large-diameter end 14 is located on the first side 11 of the energy-concentrating element 10 and faces the noise source, serving as the entrance for the concentration of sound wave energy. The small-diameter end 15 is located near the second side 12 of the energy-concentrating element 10, serving as the outlet for the output of sound wave energy. It can be understood that when the noise source emits noise sound waves, these noise sound waves will be concentrated at the large-diameter end 14 of the energy-concentrating groove 13 and propagate towards the small-diameter end 15 of the energy-concentrating groove 13 when they approach the energy-concentrating groove 13 on the energy-concentrating element 10. During the propagation process, due to the acoustic black hole effect, the propagation speed of the sound waves is reduced, thereby reducing the propagation distance of the sound waves and achieving a noise reduction effect.

[0051] The damping element 20 is used to absorb the energy accumulated in the acoustic black hole structure, thereby reducing structural vibration and sound radiation. It is attached to the second side 12 of the energy-concentrating element 10, and at least covers the position corresponding to the small-diameter end 15 of the energy-concentrating groove 13 on the second side 12 of the energy-concentrating element 10. This dissipates the sound wave energy penetrating the energy-concentrating groove 13. Specifically, the damping element 20 is made of damping material, which is used to convert the kinetic energy of solid mechanical vibration into heat energy for dissipation, mainly used for vibration and noise control. When sound wave energy passes through the damping material, due to the characteristics of the damping material, the sound wave energy is continuously reflected within the damping material, thus continuously dissipating the sound wave energy. This effectively blocks the sound wave energy from continuing to propagate away from the noise source, further reducing the propagation distance of the sound wave energy and improving the noise reduction effect.

[0052] The energy-concentrating component 10 of the present invention has a first side 11 and a second side 12. The energy-concentrating component 10 has a gradually narrowing energy-concentrating groove 13, shaped like an acoustic black hole, extending from the first side 11 to the second side 12. The energy-concentrating groove 13 has a large-diameter end 14 and a small-diameter end 15. The opening of the energy-concentrating groove 13 is located at the large-diameter end 14 and faces the noise source to concentrate noise sound wave energy. The damping component 20 is made of damping material and covers the position corresponding to the small-diameter end 15 of the energy-concentrating groove 13 on the second side 12 of the energy-concentrating component 10. When sound wave energy approaches the energy-concentrating element 10, it is concentrated at the large-diameter end 14 of the energy-concentrating groove 13 and propagates towards the small-diameter end 15 of the energy-concentrating groove 13. During propagation, due to the acoustic black hole effect, the sound speed of the sound wave energy can be reduced. After the sound wave energy penetrates the energy-concentrating element 10, it passes through the damping element 20. Due to the damping material characteristics of the damping element 20, the sound wave energy is dissipated, thereby further reducing the propagation distance of the sound wave energy. Compared with existing noise reduction technologies, the technical solution of this invention effectively improves the noise reduction effect of the noise reduction module on electrical equipment.

[0053] Furthermore, such as Figure 1 and Figure 2As shown, the inner wall of the energy-concentrating groove 13 from the first side 11 to the second side 12 is an arc-shaped convex surface facing the center line of the energy-concentrating groove 13. In this embodiment, the energy-concentrating groove 13 is gradually tapered from the first side 11 to the second side 12 of the energy-concentrating component 10. It can be understood that the energy-concentrating groove 13 has a large-diameter end 14 and a small-diameter end 15 from the groove opening to the bottom. The groove wall of the energy-concentrating groove 13 has various forms from the groove opening to the bottom, such as an arc-shaped convex surface facing the center line of the energy-concentrating groove 13, a straight plane facing the center line of the energy-concentrating groove 13, or an arc-shaped concave surface facing the center line of the energy-concentrating groove 13. Different forms have different effects on sound waves. In this embodiment, the inner wall of the energy-concentrating groove 13 is an arc-shaped convex surface facing the center line of the energy-concentrating groove 13. Compared with other shapes of the inner wall of the energy-concentrating groove 13, its sound wave attenuation effect is better, thus effectively improving the noise reduction effect of the noise reduction module.

[0054] Furthermore, such as Figure 1 and Figure 2 As shown, the energy-concentrating groove 13 is disposed through the second side 12 of the energy-concentrating component 10 and forms one or more through-holes 16, so that the acoustic energy collected by the energy-concentrating groove 13 is transmitted to the damping component 20 for dissipation. In this embodiment, the energy-concentrating groove 13 may or may not penetrate the energy-concentrating element 10. When the energy-concentrating groove 13 does not penetrate the energy-concentrating element 10, if the sound wave propagation speed is too fast, it will collide with the energy-concentrating element 10, that is, with the bottom wall of the energy-concentrating groove 13. As a result, the sound wave will generate a reflection effect and then reflect towards the large-diameter end 14 of the energy-concentrating groove 13, and collide with the sound wave at the large-diameter end 14 of the energy-concentrating groove 13, causing the sound wave energy in the energy-concentrating groove 13 to become disordered, which may cause greater noise and affect the noise reduction effect. When the energy-concentrating groove 13 penetrates the energy-concentrating element 10, the second side 12 of the energy-concentrating element 10 forms one or more through-holes 16 that communicate with the energy-concentrating groove 13. After the sound wave passes through the through-hole 16, it can be directly absorbed by the damping element 20 and dissipated inside the damping element 20, thereby effectively improving the stability of the sound wave energy dissipation and thus improving the noise reduction effect of the noise reduction module.

[0055] Furthermore, the through-hole 16 is a circular opening with a diameter of no more than 5 mm. In this embodiment, since the noise reduction module of this technical solution is generally installed in small electrical appliances to solve low-frequency noise, if the diameter of the energy-concentrating groove 13 is too large and the noise source is small, it will reduce the effect of the acoustic black hole structure and affect the noise reduction effect. Therefore, in this embodiment, the through-hole 16 of the energy-concentrating groove 13 is set to a circular opening with a diameter of no more than 5 mm, so as to effectively utilize the acoustic black hole effect and improve the noise reduction effect of the noise reduction module installed in small electrical appliances.

[0056] Furthermore, such as Figure 1 and Figure 2As shown, the energy-concentrating element 10 is plate-shaped, and there are multiple energy-concentrating slots 13 arranged in an array on the plate-shaped energy-concentrating element 10. In this embodiment, the plate-shaped energy-concentrating element 10 can uniformly concentrate sound wave energy to maintain the stability of sound wave energy within the energy-concentrating slots 13. Furthermore, the multiple energy-concentrating slots 13 arranged in an array on the energy-concentrating element 10 can effectively increase the distribution range of the noise reduction module, thereby improving the noise reduction effect.

[0057] Furthermore, the damping element 20 is disposed at the position corresponding to the small-diameter ends 15 of the plurality of energy-concentrating grooves 13 on the second side 12 of the energy-concentrating element 10. In this embodiment, the shape of the damping element 20 can be the same as that of the energy-concentrating element 10, so that the damping element 20 is attached to the second side 12 of the energy-concentrating element 10 and covers the small-diameter ends 15 of the plurality of energy-concentrating grooves 13, thereby dissipating the sound wave energy passing through the energy-concentrating grooves 13.

[0058] Not just generally, the number of damping elements 20 can also be multiple, and the number is the same as that of the energy-concentrating grooves 13. The second side 12 of the energy-concentrating element 10 is set one-to-one with the small diameter end 15 of each energy-concentrating groove 13, so as to absorb the sound wave energy that penetrates each energy-concentrating groove 13 and dissipate it inside, thereby improving the noise reduction effect of the noise reduction module.

[0059] Furthermore, such as Figure 1 and Figure 2 As shown, the damping element 20 is bonded to the second side 12 of the energy-concentrating element 10. In this embodiment, the damping element 20 is bonded to the second side 12 of the energy-concentrating element 10. It should be explained that this bonding can be done with glue, double-sided tape, or by pressing together using a process. There are no specific limitations here. The main purpose is to fix the damping element 20 to the second side 12 of the energy-concentrating element 10 to improve the structural stability of the noise reduction module.

[0060] Furthermore, such as Figure 1 and Figure 2 As shown, the energy-concentrating component 10 is made of foam board, photosensitive resin, KT board, or rubber. In this embodiment, the energy-concentrating component 10 is made of an easy-to-cut material, so that the noise reduction module can be applied to more places by cutting the energy-concentrating component 10, thereby improving the practicality of the noise reduction module. Its specific material can be foam board, photosensitive resin, KT board, or rubber, but no specific limitation is made in this embodiment.

[0061] Furthermore, such as Figure 1 and Figure 2As shown, the damping element 20 is made of neoprene rubber, epoxy resin, or asphalt. In this embodiment, the damping element 20 is made of a porous or slit material, so that after the damping element 20 absorbs sound wave energy, the sound wave energy can be continuously reflected inside the damping element 20. During the reflection process, the sound wave energy is gradually dissipated, thereby blocking the propagation of sound waves and effectively improving the noise reduction effect of the noise reduction module. Its specific material can be neoprene rubber, epoxy resin, or asphalt, but no specific limitation is made in this embodiment.

[0062] Furthermore, such as Figure 1 and Figure 2 As shown. In this embodiment, different locations or devices generate noise frequencies that are different, and the noise reduction parameters used for different frequencies of noise are also different. In this embodiment, by setting the diameter of the energy-concentrating groove 13 and the thickness of the energy-concentrating component 10, the noise reduction module achieves the same noise reduction effect when applied to different locations.

[0063] The sound velocity of the noise source, the diameter of the large-diameter end 14 of the energy-concentrating groove 13, and the thickness of the energy-concentrating element 10 satisfy the following formula.

[0064]

[0065]

[0066]

[0067] It needs to be explained that c b ρ is the sound velocity of the noise source, f is the sound frequency of the noise source, h is the thickness of the energy-concentrating element 10, E is the elastic modulus of the energy-concentrating element 10, ρ is the density of the energy-concentrating element 10, γ is the Poisson's ratio of the energy-concentrating element 10, and D is the groove diameter of the large-diameter end 14 of the energy-concentrating groove 13.

[0068] This invention also proposes a household appliance, particularly a water heater, which includes a shell, a main body, and a noise reduction module for a wiping cloth. The specific structure of the noise reduction module is as described in the above embodiments. Since the household appliance 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. The shell forms a receiving cavity; the main body is disposed within the receiving cavity of the shell; the noise reduction module is attached to the inner wall of the shell, and the damping element 20 of the noise reduction module is located between the energy-concentrating element 10 of the noise reduction module and the inner wall of the shell, so as to block the noise generated by the water heater body from being transmitted to the outside of the shell.

[0069] In this embodiment, when the noise reduction module is applied to a water heater, the appliance includes a housing with a cavity forming a receiving cavity. This cavity provides installation space for other components of the water heater. The main body of the appliance is installed within the cavity and used to heat water. The main body of the appliance generates noise during operation, which is transmitted to the outside of the water heater. Attaching the noise reduction module to the inner wall of the housing can block this noise transmission. It can be understood that one side of the damping element 20 is bonded to the energy-concentrating element 10, and the other side is bonded to the inner wall of the water heater housing, effectively fixing the noise reduction module to the water heater. The noise reduction module can be cut to fit the shape of the water heater housing, allowing it to be positioned at multiple points around the noise source, thus effectively reducing the noise propagation distance and improving the noise reduction effect of the water heater.

[0070] Furthermore, the outer casing has multiple inner walls, and each inner wall is provided with the noise reduction module. In this embodiment, the water heater has multiple outer casings, which together form an accommodating cavity. Each outer casing has an inner wall, and in this embodiment, a noise reduction module is provided on the inner wall of each outer casing, thereby enabling multi-directional noise reduction of the water heater and effectively improving its noise reduction performance.

[0071] Furthermore, such as Figure 3 and Figure 4 As shown, when the appliance is a water heater, the main body of the appliance includes:

[0072] The burner has a first combustion chamber 52 and a second combustion chamber 54 connected in sequence.

[0073] A preheating burner 51 is provided in the burner and is used to connect gas and air for combustion, so as to heat the air in the first combustion chamber 52 to a preset temperature and deliver it to the second combustion chamber 54;

[0074] Gas injection assembly 53, the gas injection assembly 53 being used to inject gas into the second combustion chamber 54 to cause a high-temperature air combustion reaction in the second combustion chamber 54; and

[0075] A heat exchanger, wherein the heat exchanger is configured to exchange heat with the burner.

[0076] In this embodiment, the water heater is a gas water heater. During combustion, it employs high-temperature air combustion, i.e., distributed combustion, resulting in lower combustion noise. However, to achieve this high-temperature air combustion state, a high-speed jet method is required. Specifically, gas and air are first introduced into the preheating burner 51 and mixed for combustion in the first combustion chamber 52, preheating the gas temperature in the first combustion chamber 52 to the target temperature. The gas is then delivered to the second combustion chamber 54 of the burner. Simultaneously, gas and / or air are injected into the second combustion chamber 54 via the gas injection assembly 53, causing a high-temperature air combustion reaction to occur within the second combustion chamber 54. A heat exchanger connects cold water to the burner or to the high-temperature flue gas discharged from the second combustion chamber 54 for heat exchange, thereby producing hot water. High-temperature air combustion results in uniform combustion without the popping sounds of combustion, thus lower combustion noise. It also ensures complete combustion, reducing sulfur dioxide and carbon monoxide emissions. However, achieving high-temperature air combustion requires gas injection, resulting in relatively high aerodynamic noise. In this embodiment, the noise reduction module can significantly reduce the aerodynamic noise, thereby improving the noise reduction effect of the gas water heater that uses high-temperature air combustion.

[0077] Furthermore, the gas injection assembly 53 may include multiple nozzles 55, which are spaced apart within the second combustion chamber 54 to inject gas into the second combustion chamber 54. Since the gas injection assembly 53 injects gas in a high-speed jet manner and there are many nozzles 55, the noise accumulation is relatively large. The existing method of applying sound-absorbing cotton is not effective and also poses safety issues. However, by attaching the noise reduction module in the above embodiment to the outer shell, the aerodynamic noise can be significantly reduced by utilizing the noise reduction principle of acoustic black holes, and safety issues can also be avoided.

[0078] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive 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 noise reduction module, characterized in that, Applied to a water heater, the water heater includes a housing, and the noise reduction module is disposed on the inner wall of the housing; the noise reduction module includes: An energy-concentrating element has a first side and a second side facing each other. The energy-concentrating element has a tapering energy-concentrating groove extending from the first side to the second side, forming an acoustic black hole shape. The energy-concentrating groove has a large-diameter end and a small-diameter end. The large-diameter end of the energy-concentrating groove faces the noise source and serves as an inlet for concentrating sound wave energy. The small-diameter end is located near the second side of the energy-concentrating element and serves as an outlet for discharging sound wave energy. A damping element is attached to the second side of the energy-concentrating element and covers at least the position corresponding to the small-diameter end of the energy-concentrating groove on the second side of the energy-concentrating element, so as to dissipate the sound wave energy that penetrates the energy-concentrating element. The diameter of the large-diameter end of the energy-concentrating groove and the thickness of the energy-concentrating element are determined based on the sound wave frequency of the noise source. The energy-concentrating groove is provided through the second side of the energy-concentrating component and forms one or more through openings, so that the acoustic energy collected by the energy-concentrating groove is transmitted to the damping component for dissipation; The through-hole is a circular opening with a diameter of no more than 5 millimeters; The sound velocity of the noise source, the diameter of the large-diameter end of the energy-concentrating groove, and the thickness of the energy-concentrating element satisfy the following formula; ； ； ； in, Let be the speed of sound of the noise source. The sound wave frequency of the noise source is... The thickness of the energy-concentrating element, The elastic modulus of the energy-concentrating component is... The density of the energy-concentrating element, Let be the Poisson's ratio of the energy-concentrating element, and D be the diameter of the groove at the large-diameter end of the energy-concentrating groove.

2. The noise reduction module as described in claim 1, characterized in that, The inner wall of the energy-concentrating trough from the first side to the second side is an arc-shaped convex surface facing the center line of the energy-concentrating trough.

3. The noise reduction module as described in claim 1, characterized in that, The energy-concentrating element is plate-shaped, and there are multiple energy-concentrating slots arranged in an array on the plate-shaped energy-concentrating element.

4. The noise reduction module as described in claim 3, characterized in that, The damping element is positioned on the second side of the energy-concentrating element, covering the positions corresponding to the small-diameter ends of the plurality of energy-concentrating slots; or... There are multiple damping elements, and their number corresponds to the number of energy-concentrating slots. The damping elements are arranged one-to-one with the positions of the multiple energy-concentrating slots on the second side of each energy-concentrating element.

5. The noise reduction module as described in claim 1, characterized in that, The damping element is bonded to the second side of the energy-concentrating element.

6. The noise reduction module as described in claim 1, characterized in that, The energy-concentrating component is made of foam board, photosensitive resin, KT board, or rubber; and / or, The damping component is made of neoprene rubber, epoxy resin, or asphalt.

7. A household appliance, characterized in that, include: The outer shell forms a receiving cavity; The main body of the household appliance is disposed within the receiving cavity of the outer casing; and, The noise reduction module as described in any one of claims 1 to 6, wherein the noise reduction module is attached to the inner wall of the housing, and the damping element of the noise reduction module is located between the energy-concentrating element of the noise reduction module and the inner wall of the housing, so as to block the transmission of noise generated by the main body of the home appliance to the outside of the housing.

8. The household appliance as described in claim 7, characterized in that, The outer shell has multiple inner walls, and each inner wall is provided with the noise reduction module.

9. The household appliance as described in claim 7, characterized in that, The main body of the home appliance includes: The burner has a first combustion chamber and a second combustion chamber connected in sequence. A preheating burner is provided in the burner and is used to connect gas and air for combustion, so as to heat the air in the first combustion chamber to a preset temperature and deliver it to the second combustion chamber; Gas injection assembly, the gas injection assembly being used to inject gas into the second combustion chamber to induce a high-temperature air combustion reaction within the second combustion chamber; and A heat exchanger, wherein the heat exchanger is configured to exchange heat with the burner.

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