Noise reduction device and gas water heater

Abstract

The present application relates to the technical field of gas appliances, and an embodiment of the present application provides a noise reduction device and a gas water heater. The noise reduction device comprises at least a housing, wherein a first silencer, a second silencer, and a third silencer are arranged in the housing along the air inlet direction according to the frequency characteristics of the noise generated when the gas water heater is fed with air. The first silencer, the second silencer, and the third silencer are respectively formed with first, second, and third silencer channels connected in sequence. By arranging the silencer channels in sections and combining the first gap channel, the second gap channel, the porous sound-absorbing layer, and the sound-absorbing wedge, the airflow noise gradually attenuates layer by layer after passing through the first silencer channel, the second silencer channel, and the third silencer channel in sequence, thereby reducing the airflow noise and improving the user's comfort.

Description

Technical Field

[0001] The present application relates to the technical field of gas appliances, and in particular to a noise reduction device and a gas water heater. Background Art

[0002] In the related art, when a gas water heater is supplied with air, a high-speed airflow is generated in its air inlet passage. Friction and resistance are generated between the airflow and the air inlet passage due to relative motion, causing the airflow to vibrate violently and generate noise. Summary of the Invention

[0003] Based on this, it is necessary to provide a noise reduction device and a gas water heater to reduce the noise generated when the gas water heater is fed with air.

[0004] According to one aspect of the present application, an embodiment of the present application provides a noise reduction device for use at an air inlet of a gas water heater, comprising:

[0005] a housing having an accommodating chamber, an air inlet being provided at one end of the housing, and an air outlet being provided at the other end of the housing, the air inlet and the air outlet being communicated with the accommodating chamber respectively; and

[0006] A first silencer, a second silencer, and a third silencer are sequentially arranged in the accommodating chamber along the air inlet direction, wherein the first silencer has a first silencer channel communicating with the air inlet, the second silencer has a second silencer channel formed therein, and the third silencer has a third silencer channel communicating with the air outlet, wherein the first silencer channel, the second silencer channel, and the third silencer channel are sequentially connected to form an air inlet channel;

[0007] Wherein, along the air inlet direction, the cross-sectional area of the second silencer channel is larger than the cross-sectional area of the first silencer channel and the cross-sectional area of the third silencer channel, and the junction of the first silencer channel and the second silencer channel and the junction of the second silencer channel and the third silencer channel are respectively formed with a step surface;

[0008] A first gap channel is defined between the first muffler and the shell, and a second gap channel is defined between the second muffler and the shell;

[0009] The first muffler is provided with a plurality of first through holes communicating with the first muffler channel and the first gap channel, and the second muffler is provided with a plurality of second through holes communicating with the second muffler channel and the second gap channel.

[0010] In the above-mentioned noise reduction device, the noise reduction device at least includes a shell. According to the frequency characteristics of the noise generated when the gas water heater is fed with air, a first silencer, a second silencer, and a third silencer are arranged in the shell along the air inlet direction, forming a first silencer channel, a second silencer channel, and a third silencer channel that are connected in sequence. Since the cross-sectional area of the second silencer channel is larger than the cross-sectional area of the first silencer channel and the cross-sectional area of the third silencer channel, and the junctions of the first silencer channel and the second silencer channel and the second silencer channel and the third silencer channel are respectively formed with step surfaces, so that the cross-sectional area at these places is a sudden change, the noise can be reflected and attenuated at the sudden change. In this way, the first silencer channel can reduce noise in the high-frequency band, the second silencer channel can reduce noise in the medium and low-frequency bands, and the third silencer channel can further reduce noise in the low-frequency band. At the same time, because the first silencer and the housing define a first gap channel, and the second silencer and the housing define a second gap channel, combined with the aforementioned structure, the first gap channel can further enhance the reduction of high-frequency noise in the first silencer channel, and the second gap channel can further enhance the reduction of medium and low-frequency noise in the second silencer channel. As a result, the airflow noise generated by the gas water heater when air enters the gas water heater is gradually attenuated layer by layer, thereby reducing noise and improving user comfort.

[0011] In one embodiment, the noise reduction device further includes a porous sound absorbing layer provided between the first muffler and the housing;

[0012] The porous sound absorbing layer and the first muffler define the first gap channel. Thus, due to the provision of the porous sound absorbing layer, the acoustic resistance is increased, so that the first muffler channel can structurally absorb a wider noise frequency band.

[0013] In one embodiment, the noise reduction device further comprises a plurality of sound absorbing wedges disposed in the third silencing channel;

[0014] The sound-absorbing wedge includes a base portion and a wedge portion opposite the base portion. The base portion is disposed on a sidewall of the third muffler channel, and the wedge portion extends away from the sidewall. The provision of the sound-absorbing wedge thus achieves a gradual transition in acoustic impedance between air and the sound-absorbing material, achieving good impedance matching and sound absorption.

[0015] In one embodiment, along the extension direction of the split portion, the length of the split portion is L1, and the length of the base portion is L2;

[0016] The ratio of L1 to L2 is 4. In this way, the sound absorption performance can be improved while ensuring the rigidity of the sound absorbing wedge skeleton.

[0017] In one embodiment, a plurality of the sound absorbing wedges are arranged around the side wall of the third muffler channel, thereby further improving the absorption effect of the third muffler channel on low-frequency noise.

[0018] In one embodiment, the sound absorbing wedge comprises a flat-head wedge, so that a better absorption effect can be achieved while saving space in the third muffler channel.

[0019] In one embodiment, the third sound-absorbing member is made of a porous sound-absorbing material, thereby further improving the noise absorption effect.

[0020] In one embodiment, the aperture of the first through hole is d1, the thickness of the first muffler is t1, the thickness of the first gap channel is h1, and the ratio of the sum of the areas of the plurality of first through holes to the area of the first muffler is P1, satisfying the following conditions:

[0021] 3mm≤d1≤3.5mm;

[0022] 1mm≤t1≤1.5mm;

[0023] 5mm≤h1≤10mm;

[0024] 0.04≤P1≤0.05.

[0025] In this way, the first silencing channel can structurally absorb a wider noise frequency band.

[0026] In one embodiment, the aperture of the second through hole is d2, the thickness of the second muffler is t2, the thickness of the second gap channel is h2, and the ratio of the sum of the areas of the plurality of second through holes to the area of the second muffler is P2, satisfying the following conditions:

[0027] 2.5mm≤d2≤3mm;

[0028] 2mm≤t2≤3mm;

[0029] 30mm≤h2≤35mm;

[0030] 0.025≤P2≤0.03.

[0031] In this way, the second silencing channel can structurally better absorb intermediate frequency noise.

[0032] In one embodiment, a plurality of the first through holes are arranged to form a repeated first unit pattern, and the first unit pattern includes one of a triangle and a rectangle; and / or

[0033] The plurality of second through holes are arranged to form a second unit pattern in a repetitive manner, wherein the second unit pattern comprises a triangle or a rectangle, so as to achieve a desired resonance frequency and better absorb noise.

[0034] In one embodiment, the extension directions of the plurality of first through holes are parallel to each other; and / or

[0035] The extension directions of the plurality of second through holes are parallel to each other. In this way, the required resonance frequency can be achieved to better absorb noise.

[0036] In one embodiment, the noise reduction device further includes a guide channel connected between the air inlet and the first silencer channel;

[0037] The cross-sectional area of the guide channel decreases along the air inlet direction, so as to facilitate the air flow into the first silencer channel.

[0038] In one embodiment, the first muffler and the housing are of an integrated or split structure, which facilitates manufacturing or installation as needed.

[0039] In one embodiment, the noise reduction device further includes a bellows;

[0040] The air outlet is connected to the air inlet of the gas water heater by means of the bellows, thereby destroying the formation of the fluid boundary layer and reducing the air inlet resistance.

[0041] According to another aspect of the present application, a gas water heater is provided, comprising the aforementioned noise reduction device, wherein the noise reduction device is disposed at the air inlet of the gas water heater. This reduces the noise generated by the gas water heater when air is introduced, thereby improving the user experience.

[0042] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the explosion structure of a noise reduction device in one embodiment of the present application;

[0044] Figure 2 This is a schematic cross-sectional view of a noise reduction device in one embodiment of the present application;

[0045] Figure 3 This is a schematic structural diagram of a sound-absorbing wedge in one embodiment of the present application;

[0046] Figure 4A schematic diagram of a first through-hole arrangement in one embodiment of the present application;

[0047] Figure 5 A schematic diagram of an arrangement of first through holes in another embodiment of the present application;

[0048] Figure 6 This is a schematic diagram of an arrangement of first through holes in another embodiment of the present application.

[0049] Brief description of component symbols:

[0050] Housing 100, air inlet 110, air outlet 120;

[0051] A first muffler 200, a first muffler channel 201, a first gap channel 202, a flow guide channel 203, and a first through hole 210;

[0052] A second muffler 300, a second muffler channel 301, a second gap channel 302, and a second through hole 310;

[0053] The third muffler 400, the third muffler channel 401, the sound absorbing wedge 410, the base 411, and the wedge 412;

[0054] porous sound absorbing layer 500;

[0055] Bellows 600;

[0056] Air inlet direction x. DETAILED DESCRIPTION

[0057] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the embodiments of the present application. It should be understood that the specific embodiments described herein are merely used to explain the present application and are not intended to limit the present application. The embodiments of the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the embodiments of the present application are not limited by the specific embodiments disclosed below.

[0058] It is understood that the terms "first", "second", etc. used in this application can be used in this article to describe various professional terms, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. However, unless otherwise specified, these professional terms are not limited by these terms. These terms are only used to distinguish one professional term from another professional term. For example, without departing from the scope of this application, the first silencer, the second silencer and the third silencer are different silencers. In the description of the embodiments of the present application, "multiple" and "several" mean at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," and the like should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two elements or an interaction relationship between two elements, unless otherwise expressly limited. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0060] In the description of the embodiments of the present application, unless otherwise expressly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0061] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0063] In the related art, when the gas water heater is intaken, the outside air flows into the mixing device through the fan air inlet pipe, and then mixes with the gas whose proportion has been adjusted by the gas proportional valve in the premixing chamber at the fan air inlet. Then, the fan blows the resulting air-fuel mixture into the burner for ignition and combustion. During this process, a high-speed airflow is generated in the air inlet channel. The relative movement between the airflow and the air inlet channel generates friction and resistance, causing the airflow to vibrate violently and generate noise. The fan noise frequency of the gas water heater, which has a greater impact on the human living environment, is generally in the frequency range of 650 to 2000 Hz. The noise between 1000 to 2000 Hz is high-frequency noise, the noise between 400 to 1000 Hz is medium-frequency noise, and the noise between 20 Hz to 400 Hz is low-frequency noise.

[0064] The inventors of this application noted that when outside air is drawn into the premix chamber via a high-speed fan at 7,000 to 10,000 rpm, it violently collides with the air inlet channel. If this frequency overlaps with the natural frequency of the gas water heater, resonance occurs, resulting in loud noise. To prevent this resonance, the inventors discovered that the resonant frequency can be improved by providing an air layer, thereby achieving noise reduction.

[0065] Based on the above considerations, in order to reduce the noise generated when the gas water heater is entering the air, the inventors have conducted in-depth research and designed a noise reduction structure. By setting up different noise reduction structures in sections and simultaneously setting corresponding air layers, not only can the noise of different frequencies be reduced in sections, but the noise bandwidth that can be absorbed by the corresponding noise reduction channel can also be widened, thereby improving the resonant frequency and further reducing the noise. The noise reduction device provided in the embodiments of the present application is described below in conjunction with the relevant descriptions of some embodiments.

[0066] Figure 1 A schematic diagram of the explosion structure of a noise reduction device in one embodiment of the present application is shown; Figure 2 A schematic cross-sectional view of a noise reduction device in one embodiment of the present application is shown; for ease of explanation, only the portion related to the embodiment of the present application is shown.

[0067] Please refer to Figure 1 and Figure 2The embodiment of the present application provides a noise reduction device for use at the air inlet of a gas water heater. The noise reduction device includes a housing 100, a first silencer 200, a second silencer 300, and a third silencer 400. The housing 100 has a receiving chamber. An air inlet 110 is defined at one end of the housing 100, and an air outlet 120 is defined at the other end of the housing 100. The air inlet 110 and the air outlet 120 are respectively connected to the receiving chamber. The first silencer 200, the second silencer 300, and the third silencer 400 are sequentially disposed within the receiving chamber along the air inlet direction x. The first muffler 200 includes a first muffler channel 201 communicating with the air inlet 110, the second muffler 300 includes a second muffler channel 301, and the third muffler 400 includes a third muffler channel 401 communicating with the air outlet 120. The first muffler channel 201, the second muffler channel 301, and the third muffler channel 401 are sequentially connected to form an air inlet channel. In other words, airflow passes through the air inlet 110, the first muffler channel 201, the second muffler channel 301, the third muffler channel 401, and the air outlet 120 in sequence before entering the air inlet of the gas water heater.

[0068] Along the air inlet direction x, the cross-sectional area of the second silencer channel 301 is larger than the cross-sectional area of the first silencer channel 201 and the cross-sectional area of the third silencer channel 401, and a step surface is formed at the junction of the first silencer channel 201 and the second silencer channel 301, and at the junction of the second silencer channel 301 and the third silencer channel 401. Because the cross-sectional area of the second silencer channel 301 is larger than the cross-sectional area of the first silencer channel 201, a step surface is formed at the junction of the two, so that the cross-sectional area between the two does not change continuously or gradually, but rather intermittently, forming a structural form in which the cross-sectional area suddenly changes. In other words, when the airflow enters the second silencer channel 301 from the first silencer channel 201, the cross-sectional area along the air inlet direction x will suddenly expand, and the sound waves will be reflected at the cross-sectional abrupt change, thereby attenuating the noise, forming an expansion-type noise reduction structure, which has a good attenuating effect on mid- and low-frequency noise. Because the cross-sectional area of the second muffler channel 301 is larger than that of the third muffler channel 401, a stepped surface is formed at the junction between the two. This results in a discontinuous, rather than continuous or gradual, change in cross-sectional area between the two, creating a structure with a sudden change in cross-sectional area. This means that when airflow enters the third muffler channel 401 from the second muffler channel 301, the cross-sectional area along the inlet direction x suddenly decreases. Sound waves are reflected at this sudden change in cross-sectional area, attenuating the noise and further enhancing the second muffler channel 301's ability to attenuate mid- and low-frequency noise.

[0069] The inventors have discovered that an air layer can affect the resonant frequency of the noise reduction structure, reducing the resonant frequency of the first muffler channel 201 to a certain extent. A first gap channel 202 is defined between the first muffler 200 and the housing 100, forming an air layer. To further enhance the regulating effect of the air layer, the first muffler 200 is provided with a plurality of first through-holes 210 connecting the first muffler channel 201 and the first gap channel 202. When airflow passes through the first muffler channel 201, the portion of external noise whose frequency matches the natural frequency of the first muffler 200 causes the air within the first through-holes 210 to resonate. This creates intense vibration and friction in the air at the neck of the first through-hole 210, enhancing the absorption effect of the first muffler channel 201 and forming an absorption peak. This significantly attenuates the sound energy, which is then converted into heat and dissipated through vibration and friction. The portion of external noise whose frequency differs from the natural frequency of the first muffler 200 can continue to be attenuated through the first gap channels 202. In this way, by providing the first gap channel 202 , the sound absorption frequency band of the noise of the first silencing channel 201 is expanded, so that the noise reduction process of the high frequency band noise can be achieved through the first silencing channel 201 .

[0070] Correspondingly, a second gap channel 302 is defined between the second muffler 300 and the housing 100, forming an air layer through the second gap channel 302. To further enhance the air layer's regulating effect, the second muffler 300 is provided with a plurality of second through-holes 310 connecting the second muffler channel 301 and the second gap channel 302. When airflow passes through the second muffler channel 301, the first muffler channel 201 attenuates most high-frequency noise, and the step formed at the junction of the first and second muffler channels 201 and 301 reduces noise to a certain extent. At this point, the second muffler channel 301 and the second gap channel 302 can further reduce mid- and low-frequency noise. When airflow passes through the third muffler channel 401, the step formed at the junction of the first and second muffler channels 201 and 301 further reduces noise, allowing the third muffler channel 401 to reduce low-frequency noise.

[0071] Therefore, combined with the structure of each silencer channel, the first gap channel 202 and the second gap channel 302, the first silencer channel 201 can reduce the noise in the high-frequency band, the second silencer channel 301 can reduce the noise in the medium and low-frequency bands, and the third silencer channel 401 can further reduce the noise in the low-frequency band. The airflow noise generated when the gas water heater is entering the air is silenced layer by layer and gradually attenuated, thereby reducing noise and improving user comfort.

[0072] In order to further enhance the attenuation effect of the sound waves far from the resonant frequency in the first muffler channel 201, in some embodiments, please continue to refer to Figure 2 The noise reduction device further includes a porous sound absorbing layer 500 disposed between the first muffler 200 and the housing 100. In this case, the first gap channel 202 is defined between the porous sound absorbing layer 500 and the first muffler 200. In other words, the porous sound absorbing layer 500 can be as follows: Figure 2 As shown, the porous sound-absorbing layer 500 is positioned adjacent to the inner wall of the housing 100, forming a first gap channel 202 with the outer wall of the first muffler 200. Thus, due to the porous sound-absorbing layer 500, it, together with the first muffler channel 201, the first through-hole 210, and the first gap channel 202, forms a resonant sound-absorbing structure, increasing acoustic resistance. This allows the first muffler channel 201 to absorb a wider frequency band of noise, thereby enhancing its noise reduction effect.

[0073] It should be noted that the porous sound-absorbing layer 500 can be composed of porous sound-absorbing materials such as organic fiber materials, linen cotton felt, inorganic fiber materials, glass wool, rock wool, mineral wool, urea-formaldehyde foam plastic, and urethane foam plastic. It can be selected according to actual conditions, and the embodiments of the present application do not make specific limitations on this.

[0074] Figure 3 A schematic structural diagram of a sound-absorbing wedge 410 in an embodiment of the present application is shown; for ease of explanation, only portions related to the embodiment of the present application are shown.

[0075] In order to further enhance the silencing effect of the third silencing channel 401, in some embodiments, please refer to Figure 3 , and combined with reference Figure 1 and Figure 2 , the noise reduction device also includes a plurality of sound-absorbing wedges 410 arranged in the third silencer channel 401. The sound-absorbing wedges 410 have a base 411 and a wedge 412 opposite to the base 411. The base 411 is arranged on the side wall of the third silencer channel 401, and the wedge 412 extends away from the side wall. In this way, by arranging the sound-absorbing wedges 410, the acoustic impedance between the air and the sound-absorbing material is gradually transitioned, thereby obtaining good impedance matching and sound absorption effects. Specifically in some embodiments, along the extension direction of the wedge 412, the length of the wedge 412 is L1, and the length of the base 411 is L2. The ratio of L1 to L2 is 4. In this way, the sound absorption performance can be improved while ensuring the skeleton stiffness of the sound-absorbing wedge 410. In other embodiments, please refer to Figure 1Multiple sound-absorbing spikes 410 are arranged around the sidewalls of the third muffler channel 401. This further enhances the absorption of low-frequency noise within the third muffler channel 401. In yet other embodiments, the third muffler 400 is constructed from a porous sound-absorbing material. Because the entire third muffler 400 is constructed from a porous sound-absorbing material, the thickness of the porous sound-absorbing material is greater than that of the porous sound-absorbing layer 500, resulting in a greater flow resistance—in other words, a greater resistance to the passage of air particles. This increases the sound absorption coefficient of low-frequency noise, further enhancing the noise absorption effect.

[0076] In some embodiments, please refer to Figure 3 The sound-absorbing wedge 410 comprises a flat-top wedge. That is, a cut surface is provided on the side of the wedge portion 412 away from the base portion 411, forming a flat-top wedge portion 412. This achieves a better absorption effect while saving space within the third muffler channel 401.

[0077] To better integrate the overall characteristics of the gas water heater, the inventors discovered that maintaining the resonant frequency of the first muffler channel 201 within the range of 1800Hz to 2200Hz and the resonant frequency of the second muffler channel 301 within the range of 500Hz to 700Hz can effectively reduce noise and eliminate most of the noise. Therefore, in some embodiments, the aperture of the first through hole 210 is d1, the thickness of the first muffler 200 is t1, the thickness of the first gap channel 202 is h1, and the ratio of the sum of the areas of the multiple first through holes 210 to the area of the first muffler 200 is P1, meeting the following conditions: 3mm≤d1≤3.5mm; 1mm≤t1≤1.5mm; 5mm≤h1≤10mm; 0.04≤P1≤0.05. This allows the first muffler channel 201 to structurally absorb a wider noise frequency band. In other embodiments, the diameter of the second through hole 310 is d2, the thickness of the second muffler 300 is t2, the thickness of the second gap channel 302 is h2, and the ratio of the sum of the areas of the plurality of second through holes 310 to the area of the second muffler 300 is P2, satisfying the following conditions: 2.5 mm ≤ d2 ≤ 3 mm; 2 mm ≤ t2 ≤ 3 mm; 30 mm ≤ h2 ≤ 35 mm; and 0.025 ≤ P2 ≤ 0.03. This allows the second muffler channel 301 to structurally better absorb mid-frequency noise. For example, the diameter d1 of the first through hole 210 can be 3 mm, the thickness t1 of the first muffler 200 can be 0.6 mm, the spacing between the first through holes 210 can be 6 mm, and the ratio P1 of the sum of the areas of the plurality of first through holes 210 to the area of the first muffler 200 can be 0.042. This allows the resonant frequency of the first muffler channel 201 to approach 2000 Hz.

[0078] Figure 4A schematic diagram showing an arrangement of the first through holes 210 in one embodiment of the present application is shown; Figure 5 A schematic diagram showing an arrangement of the first through holes 210 in another embodiment of the present application is shown; Figure 6 A schematic diagram of an arrangement of the first through holes 210 in another embodiment of the present application is shown; for ease of explanation, only the portion related to the embodiment of the present application is shown.

[0079] Since noises of different frequencies have different resonant frequencies, the arrangement of the first through holes 210 and the second through holes 310 will also be different. In actual use, the arrangement can be selected according to the resonant frequency. In some embodiments, a plurality of first through holes 210 are arranged to form a repeated first unit pattern, and the first unit pattern includes one of a triangle and a rectangle. In other embodiments, the extension directions of the plurality of first through holes 210 are parallel to each other. In some embodiments, a plurality of second through holes 310 are arranged to form a repeated second unit pattern, and the second unit pattern includes one of a triangle and a rectangle. In other embodiments, the extension directions of the plurality of second through holes 310 are parallel to each other. In this way, the desired resonant frequency can be achieved to better absorb noise. For example, Figure 4 The first unit pattern is a triangle. Figure 5 The first unit pattern is a square. Figure 6 The diagram shows that the first through holes 210 are strip-shaped holes and the plurality of first through holes 210 are parallel to each other. The arrangement of the second through holes 310 can refer to the arrangement diagram of the first through holes 210 and will not be repeated here.

[0080] It should be noted that the first unit pattern refers to the shape formed by the lines connecting the centers of adjacent first through-holes 210. For example, when the first unit pattern is a triangle, the first unit pattern refers to the triangle formed by the lines connecting the centers of three adjacent first through-holes 210. For another example, when the first unit pattern is a square, the first unit pattern refers to the square formed by the lines connecting the centers of four adjacent first through-holes 210. The description of the second unit pattern can refer to the description of the first unit pattern and is not repeated here.

[0081] In some embodiments, please refer to Figure 1 and Figure 2 The noise reduction device further includes a guide channel 203 connected between the air inlet 110 and the first muffler channel 201. The cross-sectional area of the guide channel 203 decreases along the air inlet direction x. This facilitates the diversion of air into the first muffler channel 201. It should be noted that the cross-sectional area of the guide channel 203 can be continuously or discontinuously reduced. For example, Figure 1 and Figure 2It illustrates a situation where the cross-sectional area of the flow guiding channel 203 gradually decreases.

[0082] In some embodiments, please refer to Figure 1 and Figure 2 The first muffler 200 and the housing 100 are of an integrated structure or a split structure. This makes it easy to manufacture or install as needed. For example, Figure 1 and Figure 2 The diagram shows a situation where the first muffler 200 and the housing 100 are an integrated structure.

[0083] In some embodiments, please refer to Figure 1 and Figure 2 The noise reduction device also includes a bellows 600. The air outlet 120 communicates with the gas water heater's air inlet via the bellows 600. This disrupts the formation of the fluid boundary layer and reduces air inlet resistance. Optionally, a pressure gauge (not shown) can be installed on the bellows 600, and a Venturi flowmeter (not shown) can be added as needed to more accurately measure the intake air flow rate.

[0084] Based on the same inventive concept, the present application provides a gas water heater, including the noise reduction device of the above embodiment, which is arranged at the air inlet of the gas water heater. In this way, the noise generated by the gas water heater when air is introduced can be reduced, thereby improving the user experience.

[0085] In summary, the noise reduction device in the embodiment of the present application, by setting up the silencer channel in sections, and combining the first gap channel 202, the second gap channel 302, the porous sound-absorbing layer 500 and the sound-absorbing wedge 410, improves the resonance frequency and absorbs noise of different frequencies layer by layer. From the perspective of, after the airflow noise passes through the first silencer channel 201, the second silencer channel 301 and the third silencer channel 401 in sequence, the silencer gradually attenuates layer by layer, thereby reducing the airflow noise and improving the user's comfort.

[0086] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A noise reduction device for use at the air inlet of a gas water heater, characterized in that: include: A housing (100) having a housing chamber, an air inlet (110) being provided at one end of the housing (100), and an air outlet (120) being provided at the other end of the housing (100), the air inlet (110) and the air outlet (120) being respectively connected to the housing chamber; and A first silencer (200), a second silencer (300) and a third silencer (400) are sequentially arranged in the accommodating chamber along an air inlet direction (x), wherein a first silencer channel (201) communicating with the air inlet (110) is formed in the first silencer (200), a second silencer channel (301) is formed in the second silencer (300), and a third silencer channel (401) communicating with the air outlet (120) is formed in the third silencer (400), and the first silencer channel (201), the second silencer channel (301) and the third silencer channel (401) are sequentially connected to form an air inlet channel; Wherein, along the air inlet direction (x), the cross-sectional area of the second silencer channel (301) is greater than the cross-sectional area of the first silencer channel (201) and the cross-sectional area of the third silencer channel (401), and a step surface is formed at the connection point between the first silencer channel (201) and the second silencer channel (301), and at the connection point between the second silencer channel (301) and the third silencer channel (401); A first gap channel (202) is defined between the first muffler (200) and the housing (100), and a second gap channel (302) is defined between the second muffler (300) and the housing (100); The first muffler (200) is provided with a plurality of first through holes (210) communicating with the first muffler channel (201) and the first gap channel (202), and the second muffler (300) is provided with a plurality of second through holes (310) communicating with the second muffler channel (301) and the second gap channel (302).

2. The noise reduction device according to claim 1, characterized in that The noise reduction device further comprises a porous sound absorbing layer (500) provided between the first muffler (200) and the housing (100); The first gap channel (202) is defined between the porous sound absorbing layer (500) and the first sound-absorbing member (200).

3. The noise reduction device according to claim 1, characterized in that The noise reduction device further includes a plurality of sound-absorbing wedges (410) arranged in the third muffler channel (401); The sound absorbing wedge (410) has a base (411) and a tip (412) opposite to the base (411), wherein the base (411) is provided on a side wall of the third muffler channel (401), and the tip (412) extends away from the side wall.

4. The noise reduction device according to claim 3, characterized in that: Along the extension direction of the tip (412), the length of the tip (412) is L1, and the length of the base (411) is L2; Among them, the ratio of L1 to L2 is 4.

5. The noise reduction device according to claim 3, characterized in that: A plurality of the sound absorbing wedges (410) are arranged around the side wall of the third muffler channel (401); and / or The sound absorbing wedge (410) comprises a flat-head wedge.

6. The noise reduction device according to any one of claims 1 to 5, characterized in that: The third sound-absorbing member (400) is made of a porous sound-absorbing material; and / or The extension directions of the plurality of first through holes (210) are parallel to each other; and / or The extension directions of the plurality of second through holes (310) are parallel to each other.

7. The noise reduction device according to any one of claims 1 to 5, characterized in that: The aperture of the first through hole (210) is d1, the thickness of the first muffler (200) is t1, the thickness of the first gap channel (202) is h1, and the ratio of the sum of the areas of the plurality of first through holes (210) to the area of the first muffler (200) is P1, satisfying the following conditions: 3mm≤d1≤3.5mm; 1mm≤t1≤1.5mm; 5mm≤h1≤10mm; 0.04≤P1≤0.05； And / or, the aperture of the second through hole (310) is d2, the thickness of the second muffler (300) is t2, the thickness of the second gap channel (302) is h2, and the ratio of the sum of the areas of the plurality of second through holes (310) to the area of the second muffler (300) is P2, and the following conditions are satisfied: 2.5mm≤d2≤3mm; 2mm≤t2≤3mm; 30mm≤h2≤35mm; 0.025≤P2≤0.03。 8. The noise reduction device according to any one of claims 1 to 5, characterized in that: A plurality of the first through holes (210) are arranged to form a first unit pattern repeatedly, wherein the first unit pattern comprises one of a triangle and a rectangle; and / or A plurality of the second through holes (310) are arranged to form a second unit pattern in a repetitive manner, and the second unit pattern includes one of a triangle and a rectangle.

9. The noise reduction device according to any one of claims 1 to 5, characterized in that: The noise reduction device further comprises a bellows (600), and the air outlet (120) is connected to the air inlet of the gas water heater by means of the bellows (600); and / or The noise reduction device further comprises a guide channel (203) connected between the air inlet (110) and the first muffler channel (201); along the air inlet direction (x), the cross-sectional area of the guide channel (203) decreases.

10. A gas water heater, characterized in that: It comprises the noise reduction device according to any one of claims 1 to 9, wherein the noise reduction device is arranged at the air inlet of the gas water heater.

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