Noise reduction structure and gas water heater comprising same

Abstract

The utility model provides a kind of noise reduction structure and the gas water heater comprising it.The noise reduction structure includes: cover body, including bottom wall and the side wall being set around bottom wall, bottom wall is opened with multiple air outlet holes along first direction;First noise reduction part and second noise reduction part are all set in accommodating cavity, first noise reduction part is opened with multiple first noise reduction holes, and the side of first noise reduction part towards opening is surrounded with side wall to form first chamber;Between the vertical portion of second noise reduction part and first noise reduction part is equipped with first chamber, and the arc-shaped portion is formed with second chamber connected and communicated with first chamber between side wall, and second noise reduction hole is opened on arc-shaped portion along second direction, wherein, the gas of opening into accommodating cavity, in turn pass through first chamber, first noise reduction hole, second chamber, third chamber, second noise reduction hole and air outlet hole.By setting the specific structure of noise reduction structure, large particle impurities can be effectively isolated outside the box body, and noise can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to a noise reduction structure and a gas water heater containing the same. Background Technology

[0002] Gas water heaters heat water by burning fuels such as natural gas, liquefied petroleum gas, or manufactured gas. Combustion requires air as a combustion medium, primarily sourced from the air inlet on the casing. Current gas water heater casing air inlet designs exhibit the following characteristics: Location-wise, they are mostly designed for the rear or top, prioritizing aesthetics and avoiding obstruction; structurally, they are mainly long slots or louvers to ensure unobstructed airflow. Traditional air inlets are often open designs without obstruction, easily drawing in dust, insects, and other impurities, leading to blockages in the combustion system, reduced equipment lifespan, and ineffective noise insulation from the fan impeller. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the open air inlet in the prior art, which is easily contaminated and cannot effectively block the noise of the fan impeller, and to provide a noise reduction structure and a gas water heater containing the same.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A noise reduction structure, characterized in that it comprises:

[0006] The cover includes a bottom wall and a side wall surrounding the bottom wall. The bottom wall and the side wall form an accommodating cavity. An opening is formed around one end of the side wall away from the bottom wall. The direction from the opening to the bottom wall is a first direction. A plurality of air outlet holes are formed on the bottom wall along the first direction.

[0007] Both the first noise reduction part and the second noise reduction part are disposed within the accommodating cavity. The first noise reduction part is closer to the opening than the second noise reduction part. The outer periphery of the first noise reduction part is connected to the side wall, and a plurality of first noise reduction holes are formed along the first direction. The side of the first noise reduction part facing the opening is enclosed by the side wall to form a first chamber. The second noise reduction part includes a vertical part and an arc-shaped part. One end of the vertical part is connected to the side wall, and the other end is connected to the arc-shaped part. The vertical part is arranged parallel to the first noise reduction part, and a second chamber is provided between the two. A third chamber is formed between the arc-shaped part and the side wall, which is connected to and communicates with the second chamber. A second noise reduction hole is formed on the arc-shaped part along a second direction, which is perpendicular to the first direction.

[0008] The gas entering the accommodating cavity through the opening passes sequentially through the first chamber, the first noise reduction hole, the second chamber, the third chamber, the second noise reduction hole, and the air outlet.

[0009] In this technical solution, by setting a first noise reduction part that connects the outer periphery to the side wall, large particles of impurities can be effectively isolated outside the housing, preventing impurities from entering the housing of the gas water heater and affecting its normal operation. Furthermore, by setting a first noise reduction hole on the first noise reduction part, a second noise reduction hole on the second noise reduction part, and an air duct that sequentially passes through the first chamber, the first noise reduction hole, the second chamber, the third chamber, the second noise reduction hole, and the air outlet, the air entering the noise reduction structure can be guided and buffered, thereby achieving the beneficial technical effect of effectively reducing noise.

[0010] Preferably, the noise reduction structure further includes a third noise reduction part located between the second noise reduction part and the bottom wall. The structure of the third noise reduction part is the same as that of the second noise reduction part. The vertical part of the third noise reduction part is connected to the arcuate part of the second noise reduction part. The arcuate part of the third noise reduction part is provided with a third noise reduction hole along the first direction.

[0011] A fourth chamber is provided between the vertical part of the third noise reduction part and the vertical part of the second noise reduction part, and is connected to the third chamber through the second noise reduction hole. A fifth chamber is formed between the arc-shaped part of the third noise reduction part and the side wall, which is connected to and communicates with the fourth chamber.

[0012] In this technical solution, by setting a third noise reduction unit, the path of air entering the noise reduction structure can be further extended, thereby further guiding and buffering the air entering the noise reduction structure, and further improving the noise reduction effect.

[0013] Preferably, along the first direction, the size of the second chamber is 30%-50% of the size of the fourth chamber.

[0014] In this technical solution, by setting the size relationship between the second chamber and the fourth chamber, an effective airflow guiding effect can be achieved. That is, the air entering the second chamber through the first noise reduction hole can gather towards the third chamber connected to the second chamber after it comes into close contact with the vertical part of the second noise reduction part, thereby effectively entering the correct air duct position as designed.

[0015] Preferably, the noise reduction structure further includes a fourth noise reduction part, which is disposed between the third noise reduction part and the bottom wall. One end of the fourth noise reduction part is connected to one end of the vertical part away from the third noise reduction part in the arc-shaped part, and the other end is connected to the side wall.

[0016] The noise reduction structure further includes a first partition, which extends along the first direction and has one end connected to the connection between the vertical part of the third noise reduction part and the arc-shaped part of the second noise reduction part, and the other end connected to the fourth noise reduction part. A sixth chamber is formed between the third noise reduction part and the fourth noise reduction part, which communicates with the fifth chamber through the third noise reduction hole. The first partition separates the third chamber and the sixth chamber.

[0017] The fourth noise reduction part has a fourth noise reduction hole along the first direction. The fourth noise reduction hole corresponds one-to-one with the air outlet hole and is arranged to overlap along the first direction.

[0018] In this technical solution, by setting the specific structure of the fourth noise reduction unit, further noise reduction can be achieved without hindering the normal flow of air.

[0019] Preferably, the noise reduction structure further includes a plurality of second partitions, the two ends of which are respectively connected to the fourth noise reduction part and the bottom wall along the first direction, and the plurality of second partitions are spaced apart along the second direction. Two adjacent second partitions are respectively located on both sides of the air outlet along the second direction, forming a seventh chamber that communicates with the sixth chamber through the fourth noise reduction hole.

[0020] In this technical solution, by setting a second partition to form multiple spaced seventh chambers, the flowing air is further regulated. After being regulated by the seventh chamber, the air enters the box evenly, which reduces noise and makes the combustion more stable.

[0021] Preferably, along the first direction, the size of the seventh chamber is 30%-50% of the size of the sixth chamber; and / or,

[0022] Along the first direction, the size of the seventh chamber is 2mm-4mm.

[0023] In this technical solution, the relationship between the dimensions of the seventh chamber and the sixth chamber is set to ensure that the seventh chamber effectively manages the flowing air. By setting the range of values ​​for the dimensions of the seventh chamber, it is possible to avoid the size being too large to achieve effective management, and to avoid the size being too small to affect airflow.

[0024] Preferably, the total air outlet area of ​​the air outlet is less than the total air inlet area of ​​the first noise reduction hole, and is greater than or equal to 75% of the total air inlet area of ​​the first noise reduction hole.

[0025] In this technical solution, the above settings can reduce noise while ensuring normal airflow.

[0026] Preferably, along the first direction, the size of the second chamber is 2mm-4mm; and / or,

[0027] The dimension of the third chamber along the second direction is 2 to 2.5 times the dimension of the second chamber along the first direction.

[0028] In this technical solution, by setting the range of values ​​for the size of the second chamber, it is possible to avoid the size being too large to achieve the desired airflow guiding effect, and also to avoid the size being too small to affect airflow. By setting the relationship between the size of the third chamber along the second direction and the size of the second chamber along the first direction, air can be guided through the arc-shaped flow channel of the third chamber, further reducing air noise.

[0029] A gas water heater is characterized in that the gas water heater includes the noise reduction structure as described above, the noise reduction structure is disposed inside the casing of the gas water heater and located at the air inlet of the gas water heater.

[0030] Preferably, the air inlet is provided with an air guide on the side facing the noise reduction structure, the air guide is located in the first cavity, and there is a gap between the air guide and the first noise reduction part.

[0031] In this technical solution, by setting a gap between the air guide section and the first noise reduction section, the air can be guided from the air inlet through the air guide section and then enter the first chamber through the gap for buffering, thereby ensuring normal air circulation.

[0032] The positive and progressive effects of this utility model are as follows:

[0033] This invention, by setting a first noise-reducing part in the noise-reducing structure with its outer periphery connected to the side wall, can effectively isolate large particles of impurities outside the housing, preventing impurities from entering the gas water heater housing and affecting its normal operation. Furthermore, by setting a first noise-reducing hole on the first noise-reducing part, a second noise-reducing hole on the second noise-reducing part, and an air duct that sequentially passes through the first chamber, the first noise-reducing hole, the second chamber, the third chamber, the second noise-reducing hole, and the air outlet, the air entering the noise-reducing structure can be guided and buffered, thereby achieving the beneficial technical effect of effectively reducing noise. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of a noise reduction structure according to a preferred embodiment of the present invention.

[0035] Figure 2This is a three-dimensional structural diagram of the noise reduction structure of a preferred embodiment of the present invention from another angle.

[0036] Figure 3 This is a cross-sectional view of a noise reduction structure according to a preferred embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of the airflow direction of the noise reduction structure in a preferred embodiment of the present invention.

[0038] Figure 5 This is a three-dimensional structural diagram of a gas water heater according to a preferred embodiment of the present invention.

[0039] Figure 6 This is a partial three-dimensional structural diagram of a gas water heater according to a preferred embodiment of the present invention, taken from another angle.

[0040] Figure 7 This is a partial cross-sectional perspective view of a gas water heater according to a preferred embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures

[0042] Gas water heater 100

[0043] Noise Reduction Structure 1

[0044] 10 Shields

[0045] Bottom wall 101

[0046] Side wall 102

[0047] Opening 103

[0048] Air outlet 104

[0049] Installation Department 105

[0050] First noise reduction section 11

[0051] First noise reduction hole 111

[0052] Second noise reduction section 12

[0053] The vertical part 121 of the second noise reduction section

[0054] The arc-shaped part 122 of the second noise reduction section

[0055] Second noise reduction hole 123

[0056] Third noise reduction section 13

[0057] The vertical section 131 of the third noise reduction unit

[0058] The arc-shaped part of the third noise reduction section 132

[0059] Third noise reduction section hole 133

[0060] Fourth noise reduction section 14

[0061] Fourth noise reduction hole 141

[0062] First partition section 151

[0063] Second partition section 152

[0064] First chamber 161

[0065] Second chamber 162

[0066] Third chamber 163

[0067] Fourth chamber 164

[0068] Fifth chamber 165

[0069] Sixth Chamber 166

[0070] Seventh Chamber 167

[0071] Box 2

[0072] Air inlet 21

[0073] Air guide section 22

[0074] Cover plate 3 Detailed Implementation

[0075] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown 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 this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the protection scope of this utility model.

[0076] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0077] 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 utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0078] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a noise reduction structure 1, which includes: a cover 10, a first noise reduction part 11, and a second noise reduction part 12.

[0079] The cover 10 includes a bottom wall 101 and a side wall 102 surrounding the bottom wall 101. The bottom wall 101 and the side wall 102 form a cavity. An opening 103 is formed around the end of the side wall 102 away from the bottom wall 101. The direction from the opening 103 to the bottom wall 101 is a first direction Q1. A plurality of air outlet holes 104 are opened on the bottom wall 101 along the first direction Q1.

[0080] The first noise reduction part 11 and the second noise reduction part 12 are both disposed in the accommodating cavity. The first noise reduction part 11 is closer to the opening 103 than the second noise reduction part 12. The outer periphery of the first noise reduction part 11 is connected to the side wall 102, and a plurality of first noise reduction holes 111 are opened along the first direction Q1. The side of the first noise reduction part 11 facing the opening 103 and the side wall 102 surround the first chamber 161. The second noise reduction part 12 includes a vertical part 121 and an arc-shaped part 122. One end of the vertical part 121 is connected to the side wall 102, and the other end is connected to the arc-shaped part 122. The vertical part 121 is arranged parallel to the first noise reduction part 11, and a second chamber 162 is provided between the two. A third chamber 163 is formed between the arc-shaped part 122 and the side wall 102, which is connected and communicates with the second chamber 162. A second noise reduction hole 123 is opened on the arc-shaped part 122 along the second direction Q2, which is perpendicular to the first direction Q1.

[0081] The gas entering the accommodating cavity through the opening 103 passes sequentially through the first chamber 161, the first noise reduction hole 111, the second chamber 162, the third chamber 163, the second noise reduction hole 123, and the air outlet 104.

[0082] In this way, by setting the first noise reduction part 11 connected to the outer periphery and the side wall 102, large particles of impurities can be effectively isolated outside the housing 2, preventing impurities from entering the housing 2 of the gas water heater 100 and affecting the normal operation of the gas water heater 100. Furthermore, by setting the first noise reduction hole 111 on the first noise reduction part 11, the second noise reduction hole 123 on the second noise reduction part 12, and the air duct that passes through the first chamber 161, the first noise reduction hole 111, the second chamber 162, the third chamber 163, the second noise reduction hole 123 and the air outlet 104 in sequence, the air entering the noise reduction structure 1 can be guided and buffered, thereby achieving the beneficial technical effect of effectively reducing noise.

[0083] Furthermore, by setting the first chamber 161, the gas that has just entered the accommodating cavity can be effectively buffered. Multiple first noise reduction holes 111 are arranged in an array to make the air intake more uniform. Multiple air outlet holes 104 are arranged in an array to make the air outlet more uniform.

[0084] Preferably, the noise reduction structure 1 further includes a third noise reduction part 13 located between the second noise reduction part 12 and the bottom wall 101. The structure of the third noise reduction part 13 is the same as that of the second noise reduction part 12, that is, the third noise reduction part 13 also includes a vertical part 131 and an arc-shaped part 132 connected to each other. The vertical part 131 of the third noise reduction part 13 is connected to the arc-shaped part 132 of the third noise reduction part 13, and the vertical part 131 of the third noise reduction part 13 and the vertical part 121 of the second noise reduction part 12 are arranged parallel to each other. The arc-shaped part 132 of the third noise reduction part 13 has a third noise reduction hole along the first direction Q1. A fourth chamber 164, connected to the third chamber 163, is provided between the vertical portion 131 of the third noise reduction unit 13 and the vertical portion 121 of the second noise reduction unit 12, and communicates with the third chamber 163 via a second noise reduction hole 123. A fifth chamber 165, connected to and communicating with the fourth chamber 164, is formed between the arc-shaped portion 132 of the third noise reduction unit 13 and the side wall 102. Thus, by providing the third noise reduction unit 13, the path of air entering the noise reduction structure 1 can be further extended, thereby further guiding and buffering the air entering the noise reduction structure 1, and further improving the noise reduction effect. Furthermore, the number and diameter of the third noise reduction hole and the second noise reduction hole 123 are the same to ensure smooth airflow.

[0085] Preferably, along the first direction Q1, the size a1 of the second chamber 162 is 30%-50% of the size a3 of the fourth chamber 164. In this way, by setting the relationship between the size a1 of the second chamber 162 and the size a3 of the fourth chamber 164, an effective airflow guiding effect can be achieved. That is, the air entering the second chamber 162 through the first noise reduction hole 111 can gather towards the third chamber 163, which is connected to the second chamber 162, after it comes into close contact with the vertical part 121 of the second noise reduction part 12, thereby effectively entering the correct air duct position as designed.

[0086] In this embodiment, the noise reduction structure 1 further includes a fourth noise reduction part 14, which is disposed between the third noise reduction part 13 and the bottom wall 101. One end of the fourth noise reduction part 14 is connected to one end of the vertical part 131 away from the third noise reduction part 13 in the arcuate part 132 of the third noise reduction part 13, and the other end is connected to the side wall 102. The noise reduction structure 1 also includes a first partition part 151, which extends along the first direction Q1. One end is connected to the connection between the vertical part 131 of the third noise reduction part 13 and the arcuate part 122 of the second noise reduction part 12, and the other end is connected to the fourth noise reduction part 14. A sixth chamber 166 is formed between the third noise reduction part 13 and the fourth noise reduction part 14, which communicates with the fifth chamber 165 through a third noise reduction hole. The first partition part 151 separates the third chamber 163 and the sixth chamber 166. The fourth noise reduction unit 14 has a fourth noise reduction hole 141 along the first direction Q1. The fourth noise reduction hole 141 corresponds one-to-one with the air outlet 104 and is arranged overlappingly along the first direction Q1. In this way, by setting the specific structure of the fourth noise reduction unit 14, further noise reduction can be achieved without hindering the normal flow of air.

[0087] Furthermore, the noise reduction structure 1 also includes multiple second partitions 152. The two ends of each second partition 152 along the first direction Q1 are respectively connected to the fourth noise reduction section 14 and the bottom wall 101. The multiple second partitions 152 are spaced apart along the second direction Q2. Two adjacent second partitions 152 are respectively located on both sides of the air outlet 104 along the second direction Q2, forming a seventh chamber 167 that communicates with the sixth chamber 166 through the fourth noise reduction hole 141. In this way, by setting the second partitions 152 to form multiple spaced seventh chambers 167, the flowing air is further regulated. After being regulated by the seventh chambers 167, the air enters the housing 2 evenly, reducing noise while also making combustion more stable.

[0088] Preferably, along the first direction Q1, the size a6 of the seventh chamber 167 is 30%-50% of the size a5 of the sixth chamber 166. Along the first direction Q1, the size a6 of the seventh chamber 167 is 2mm-4mm.

[0089] In this way, by setting the relationship between the size a6 of the seventh chamber 167 and the size a5 of the sixth chamber 166, it is ensured that the seventh chamber 167 effectively manages the flowing air. By setting the range of values ​​for the size of the seventh chamber 167, it is possible to avoid the size being too large and thus failing to achieve effective management, and on the other hand, to avoid the size being too small and thus affecting the airflow.

[0090] Preferably, the total air outlet area of ​​the air outlet 104 is smaller than the total air inlet area of ​​the first noise reduction hole 111, so as to further enhance the noise reduction effect. More preferably, the total air outlet area of ​​the air outlet 104 is smaller than the total air inlet area of ​​the first noise reduction hole 111, and greater than or equal to 75% of the total air inlet area of ​​the first noise reduction hole 111. Thus, through the above arrangement, noise reduction can be achieved while ensuring normal airflow. Furthermore, the aperture r2 of the air outlet 104 is the same as the aperture r1 of the first noise reduction hole 111, so that the total air inlet area and the total air inlet area can be adjusted by adjusting the number of air outlets 104 and the first noise reduction holes 111.

[0091] Specifically, the aperture r1 of the first noise reduction hole 111 is 8 mm - 10 mm. By setting the aperture r1 range of the first noise reduction hole 111, on the one hand, it can effectively prevent impurities from entering the interior of the gas water heater 100 housing 2 and affecting the normal operation of the gas water heater 100; on the other hand, it can ensure smooth air circulation.

[0092] Preferably, along the first direction Q1, the size a1 of the second chamber 162 is 2mm-4mm. In this way, by setting the range of values ​​for the size of the second chamber 162, it is possible to avoid the size being too large and thus failing to guide the airflow, and to avoid the size being too small and thus affecting the airflow.

[0093] The dimension b2 of the third chamber 163 along the second direction Q2 is 2 to 2.5 times the dimension a1 of the second chamber 162 along the first direction Q1. By setting the relationship between the dimension b2 of the third chamber 163 along the second direction Q2 and the dimension a1 of the second chamber 162 along the first direction Q1, air can be guided through the arc-shaped flow channel of the third chamber 163, further reducing air noise. The dimension b4 of the fifth chamber 165 along the second direction Q2 is the same as the dimension b2 of the third chamber 163 along the second direction Q2.

[0094] The noise reduction structure 1 has a mounting part 105 on the outer periphery of the opening 103. The mounting part 105 is used to fix the noise reduction structure 1 to other components.

[0095] like Figure 4 As shown, the air duct formed by the noise reduction structure 1 in this embodiment is as follows: passing through the first chamber 161, the first noise reduction hole 111, the second chamber 162, the second noise reduction hole 123, the third chamber 163, the fourth chamber 164, the third noise reduction hole, the fifth chamber 165, the sixth chamber 166, the fourth noise reduction hole 141, the seventh chamber 167 and the air outlet 104 in sequence. Figure 4 The double arrows in the diagram indicate the direction of airflow.

[0096] like Figure 5 , Figure 6 and Figure 7As shown, this embodiment also provides a gas water heater 100, which includes the noise reduction structure 1 described above. The noise reduction structure 1 is disposed inside the casing 2 of the gas water heater 100 and located at the air inlet 21 of the gas water heater 100. A cover plate 3 is provided on the casing 2. Figure 6 In order to better showcase the internal structure of the box 2, the cover plate 3 is removed.

[0097] The fastener passes through the mounting part 105 and the housing 2, fixing the noise reduction structure 1 to the housing 2.

[0098] Preferably, the air inlet 21 has an air guide 22 on the side facing the noise reduction structure 1. The air guide 22 is located inside the first chamber 161, and a gap is provided between the air guide 22 and the first noise reduction part 11. In this way, by providing a gap between the air guide 22 and the first noise reduction part 11, air can be guided from the air inlet 21 through the air guide 22 and then enter the first chamber 161 through the gap for buffering, thereby ensuring normal airflow. Specifically, the gap is greater than or equal to 2mm.

[0099] In this embodiment, by setting a first noise reduction part 11 with its outer periphery connected to the side wall 102 in the noise reduction structure 1, large particles of impurities can be effectively isolated outside the housing 2, preventing impurities from entering the housing 2 of the gas water heater 100 and affecting the normal operation of the gas water heater 100. Furthermore, by setting a first noise reduction hole 111 on the first noise reduction part 11, a second noise reduction hole 123 on the second noise reduction part 12, and an air duct that sequentially passes through the first chamber 161, the first noise reduction hole 111, the second chamber 162, the third chamber 163, the second noise reduction hole 123, and the air outlet 104, the air entering the noise reduction structure 1 can be guided and buffered, thereby achieving the beneficial technical effect of effectively reducing noise.

[0100] The gas water heater 100 can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the gas water heater 100 to perform corresponding operations, thereby realizing intelligent control of the gas water heater 100 and improving the user experience.

[0101] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A noise reduction structure, characterized in that, The noise reduction structure includes: The cover includes a bottom wall and a side wall surrounding the bottom wall. The bottom wall and the side wall form an accommodating cavity. An opening is formed around one end of the side wall away from the bottom wall. The direction from the opening to the bottom wall is a first direction. A plurality of air outlet holes are formed on the bottom wall along the first direction. Both the first noise reduction part and the second noise reduction part are disposed within the accommodating cavity. The first noise reduction part is closer to the opening than the second noise reduction part. The outer periphery of the first noise reduction part is connected to the side wall, and a plurality of first noise reduction holes are formed along the first direction. The side of the first noise reduction part facing the opening is enclosed by the side wall to form a first chamber. The second noise reduction part includes a vertical part and an arc-shaped part. One end of the vertical part is connected to the side wall, and the other end is connected to the arc-shaped part. The vertical part is arranged parallel to the first noise reduction part, and a second chamber is provided between the two. A third chamber is formed between the arc-shaped part and the side wall, which is connected to and communicates with the second chamber. A second noise reduction hole is formed on the arc-shaped part along a second direction, which is perpendicular to the first direction. The gas entering the accommodating cavity through the opening passes sequentially through the first chamber, the first noise reduction hole, the second chamber, the third chamber, the second noise reduction hole, and the air outlet.

2. The noise reduction structure as described in claim 1, characterized in that, The noise reduction structure further includes a third noise reduction part located between the second noise reduction part and the bottom wall. The structure of the third noise reduction part is the same as that of the second noise reduction part. The vertical part of the third noise reduction part is connected to the arc-shaped part of the second noise reduction part. The arc-shaped part of the third noise reduction part is provided with a third noise reduction hole along the first direction. A fourth chamber is provided between the vertical part of the third noise reduction part and the vertical part of the second noise reduction part, and is connected to the third chamber through the second noise reduction hole. A fifth chamber is formed between the arc-shaped part of the third noise reduction part and the side wall, which is connected to and communicates with the fourth chamber.

3. The noise reduction structure as described in claim 2, characterized in that, Along the first direction, the size of the second chamber is 30%-50% of the size of the fourth chamber.

4. The noise reduction structure as described in claim 2, characterized in that, The noise reduction structure further includes a fourth noise reduction part, which is disposed between the third noise reduction part and the bottom wall. One end of the fourth noise reduction part is connected to one end of the vertical part away from the third noise reduction part in the arc-shaped part, and the other end is connected to the side wall. The noise reduction structure further includes a first partition, which extends along the first direction and has one end connected to the connection between the vertical part of the third noise reduction part and the arc-shaped part of the second noise reduction part, and the other end connected to the fourth noise reduction part. A sixth chamber is formed between the third noise reduction part and the fourth noise reduction part, which communicates with the fifth chamber through the third noise reduction hole. The first partition separates the third chamber and the sixth chamber. The fourth noise reduction part has a fourth noise reduction hole along the first direction. The fourth noise reduction hole corresponds one-to-one with the air outlet hole and is arranged to overlap along the first direction.

5. The noise reduction structure as described in claim 4, characterized in that, The noise reduction structure further includes a plurality of second partitions, the two ends of which are respectively connected to the fourth noise reduction part and the bottom wall along the first direction, and the plurality of second partitions are spaced apart along the second direction. Two adjacent second partitions are respectively located on both sides of the air outlet along the second direction, forming a seventh chamber that communicates with the sixth chamber through the fourth noise reduction hole.

6. The noise reduction structure as described in claim 5, characterized in that, Along the first direction, the size of the seventh chamber is 30%-50% of the size of the sixth chamber; and / or, Along the first direction, the size of the seventh chamber is 2mm-4mm.

7. The noise reduction structure as described in claim 1, characterized in that, The total air outlet area of ​​the air outlet is less than the total air inlet area of ​​the first noise reduction hole, and is greater than or equal to 75% of the total air inlet area of ​​the first noise reduction hole.

8. The noise reduction structure as described in claim 1, characterized in that, Along the first direction, the size of the second chamber is 2mm-4mm; and / or, The dimension of the third chamber along the second direction is 2 to 2.5 times the dimension of the second chamber along the first direction.

9. A gas water heater, characterized in that, The gas water heater includes a noise reduction structure as described in any one of claims 1-8, the noise reduction structure being disposed inside the gas water heater housing and located at the air inlet of the gas water heater.

10. The gas water heater as described in claim 9, characterized in that, The air inlet is provided with an air guide on the side facing the noise reduction structure. The air guide is located in the first chamber, and there is a gap between the air guide and the first noise reduction part.

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