Gas water heater noise reduction structure and gas water heater

Abstract

The utility model belongs to hot water equipment technical field discloses gas -heated water heater noise reduction structure and gas -heated water heater. Through setting up sound absorption structure in the shell, the outer wall surface of inner frame sets up first sound absorption layer, the inner wall surface of inner frame sets up second sound absorption layer, forms double -deck sound absorption unit, and the heating device as one of the noise source is installed in sound absorption structure when specific application, can promote the overall noise reduction effect of gas -heated water heater when working, improves user experience. Since sound absorption unit is inserted in the shell through dismounting import and export, when replacing sound absorption unit or maintaining heating device, only need to remove first cover, and the sound absorption unit can be replaced by drawing out sound absorption unit, after drawing out sound absorption unit, the space around heating device increases, and it is convenient to maintain heating device, and heating device does not need to be removed, improves the maintenance convenience of heating device, and does not need to use larger volume shell, is favorable to the miniaturization of gas -heated water heater and reduces the cost of gas -heated water heater.

Description

Technical Field

[0001] This utility model relates to the field of hot water equipment technology, and in particular to a noise reduction structure for a gas water heater and a gas water heater. Background Technology

[0002] Gas water heaters use natural gas as fuel. The burner burns the gas, producing high-temperature flue gas. A fan then blows this high-temperature flue gas into a heat exchanger, where cold water flowing through the heat exchanger absorbs the heat from the flue gas and heats up to form hot water. The burner and fan generate significant noise during operation, which is the main source of noise in gas water heaters and seriously affects the user experience.

[0003] To address this, existing technologies propose setting a sound-absorbing structure on the inner wall of the casing. However, directly setting a sound-absorbing structure on the inner wall of the casing presents the following technical problems:

[0004] 1. During operation, the outer shell of a gas water heater is at a high temperature. The sound-absorbing structure is exposed to a high-temperature environment for a long time, which causes the sound-absorbing structure to age quickly and needs to be replaced regularly. However, this replacement is inconvenient.

[0005] 2. The sound-absorbing structure occupies internal space within the casing, reducing the space available for arranging the heating element of the gas water heater. After the heating element is installed inside the casing, the gap between the sound-absorbing structure and the heating element is small, making future maintenance of the heating element inconvenient. Increasing the gap between the sound-absorbing structure and the heating element would necessitate enlarging the casing, which not only hinders the miniaturization of gas water heaters but also increases production costs. Utility Model Content

[0006] One of the technical problems solved by this utility model is to provide a noise reduction structure for a gas water heater that can improve the ease of replacing the sound-absorbing unit and the ease of maintaining the internal structure of the gas water heater while ensuring the noise reduction effect.

[0007] The second technical problem solved by this utility model is to provide a gas water heater that, while ensuring noise reduction, improves the ease of replacing the sound-absorbing unit and the ease of maintaining the internal structure of the gas water heater.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] The noise reduction structure for gas water heaters includes:

[0010] The sound-absorbing structure includes a sound-absorbing unit, wherein the sound-absorbing unit includes an inner frame arranged through the front and rear direction of the gas water heater, a first sound-absorbing layer disposed on the outer wall of the inner frame, and a second sound-absorbing layer disposed on the inner wall of the inner frame.

[0011] The outer casing has a disassembly and assembly inlet / outlet at one end in the front-rear direction. The sound-absorbing unit is inserted into the outer casing through the disassembly and assembly inlet / outlet. The outer casing is connected to a detachable first cover plate for sealing the disassembly and assembly inlet / outlet.

[0012] The noise reduction structure for gas water heaters described in this utility model has the following advantages compared to the prior art:

[0013] By setting a sound-absorbing structure inside the outer shell, and setting a first sound-absorbing layer on the outer wall of the inner frame and a second sound-absorbing layer on the inner wall of the inner frame, a double-layer sound-absorbing unit is formed. In specific applications, the heating device, which is one of the noise sources, is installed inside the sound-absorbing structure. In this way, the overall noise reduction effect of the gas water heater during operation can be improved, thereby improving the user experience.

[0014] Because the sound-absorbing unit is inserted into the outer casing through the inlet and outlet, when it is necessary to replace the sound-absorbing unit or repair the heating device, only the first cover plate needs to be removed and the sound-absorbing unit can be pulled out for replacement. After the sound-absorbing unit is pulled out, the space around the heating device increases, making it easier for maintenance personnel to repair the heating device without having to disassemble the entire heating device, thus improving the convenience and efficiency of maintenance. Furthermore, it eliminates the need for a larger outer casing, which is conducive to the miniaturization of gas water heaters and reduces their cost.

[0015] In one embodiment, one of the inner frame and the outer shell is provided with a sliding groove, and the other is provided with a sliding rail. The sliding groove is opened at one end near the disassembly / assembly inlet / outlet, and the sliding rail can move in and out of the sliding groove in the front-back direction. The sliding rail and the sliding groove slide in the front-back direction.

[0016] In one embodiment, at least one of the opposite sides of the first sound-absorbing layer and the inner frame is provided with a first partition groove, and the first sound-absorbing layer is attached to the outer wall of the inner frame to block the opening of the first partition groove to form a first air cavity.

[0017] And / or, at least one of the opposite sides of the second sound-absorbing layer and the inner frame is provided with a second partition groove, and the second sound-absorbing layer is attached to the inner wall of the inner frame so that the opening of the second partition groove is blocked to form a second air cavity.

[0018] In one embodiment, the first sound-absorbing layer is polyester fiber sound-absorbing cotton, or rubber and plastic egg cotton, or polyurethane foam;

[0019] And / or, the second sound-absorbing layer is glass wool, rock wool, or aluminum silicate fiber wool.

[0020] In one embodiment, the housing has a second cover plate disposed opposite to the first cover plate in the front-rear direction, the second cover plate being used to block the opening of the housing away from the disassembly / assembly port in the front-rear direction;

[0021] The outer casing is provided with a sound insulation plate that is opposite to the second cover plate. The sound absorption unit is located on the front side of the sound insulation plate and abuts against the sound insulation plate in the front-back direction.

[0022] In one embodiment, the second cover plate and the sound insulation plate are spaced apart in the front-to-back direction and form an air intake cavity, and the second cover plate is provided with an air intake hole communicating with the air intake cavity;

[0023] The sound-absorbing structure is provided with multiple airflow channels. The air inlet cavity is connected to the inner cavity of the sound-absorbing structure through the airflow channels. The air inlet is located in the area enclosed by all the airflow channels.

[0024] In one embodiment, the rear end face of the sound-absorbing unit is provided with a plurality of ventilation slots arranged at intervals along its circumference, one end of the ventilation slots extending to the inner wall of the sound-absorbing unit; the sound insulation plate is provided with ventilation holes extending through its thickness direction, the ventilation holes being corresponding to the ventilation slots, and the front end of the ventilation hole being at least partially facing the corresponding ventilation slot, so that the ventilation hole and the corresponding ventilation slot are connected to form the airflow channel;

[0025] Alternatively, the sound insulation board may have an airflow channel extending through its thickness, with a portion of the front opening of the airflow channel blocked by the rear end face of the sound absorption unit and the other portion located inside the sound absorption unit.

[0026] The second technical problem mentioned above is solved by the following technical solution:

[0027] A gas water heater includes a heating device and a noise reduction structure for the gas water heater as provided in any of the above embodiments, wherein the heating device is located in the inner cavity of the sound-absorbing structure.

[0028] Compared with the prior art, the gas water heater described in this utility model has the following beneficial effects:

[0029] The gas water heater provided by this utility model has a sound-absorbing structure inside the outer shell, a first sound-absorbing layer on the outer wall of the inner frame, and a second sound-absorbing layer on the inner wall of the inner frame, forming a double-layer sound-absorbing unit. In specific applications, the heating device, which is one of the noise sources, is installed inside the sound-absorbing structure. In this way, the overall noise reduction effect of the gas water heater during operation can be improved, thereby improving the user experience.

[0030] Because the sound-absorbing unit is inserted into the outer casing through the inlet and outlet, when it is necessary to replace the sound-absorbing unit or repair the heating device, only the first cover plate needs to be removed and the sound-absorbing unit can be pulled out for replacement. After removing the sound-absorbing unit, the space around the heating device is increased, making it easier for maintenance personnel to repair the heating device without having to disassemble the entire heating device, thus improving the convenience and efficiency of maintenance. Furthermore, it eliminates the need for a larger outer casing, which is conducive to the miniaturization of gas water heaters and reduces their cost.

[0031] In one embodiment, the gas water heater further includes a mounting bracket, on which the heating device is mounted;

[0032] The outer shell is provided with a sound insulation plate located behind the sound absorption unit. The second cover plate of the outer shell and the sound insulation plate are spaced apart in the front-to-back direction to form an air intake cavity. The mounting bracket passes through the sound insulation plate. One end of the mounting bracket is placed in the air intake cavity and fixed to the bottom wall of the outer shell, and the other end is placed in the inner cavity of the sound absorption structure.

[0033] In one embodiment, the gas water heater further includes a pipe, the pipe including a gas pipe and / or an inlet / outlet water pipe;

[0034] The outer casing contains a sound-insulating plate located behind the sound-absorbing unit. The second cover plate of the outer casing and the sound-insulating plate are spaced apart along the front-to-back direction to form an air intake chamber. The pipe extends from the bottom wall of the outer casing into the air intake chamber, passes through the sound-insulating plate, and then extends into the inner cavity of the sound-absorbing structure; or...

[0035] The bottom wall of the sound-absorbing unit is provided with a clearance hole. The rear end of the clearance hole extends to the rear end face of the sound-absorbing unit to form an inlet / outlet opening. The clearance hole is vertically disposed through the bottom wall of the sound-absorbing unit. The pipe passes through the bottom wall of the outer shell and the clearance hole and extends into the inner cavity of the sound-absorbing structure. The pipe can enter and exit the clearance hole through the inlet / outlet opening; or,

[0036] The bottom wall of the sound-absorbing unit is provided with a first through hole, which is located in front of the rear end of the sound-absorbing unit. The pipe includes a first pipe section and a second pipe section. The first pipe section passes through the bottom wall of the outer shell and the first through hole and extends into the inner cavity of the sound-absorbing structure. The second pipe section is located in the inner cavity of the sound-absorbing structure. The first pipe section and the second pipe section are detachably and sealed together. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a gas water heater provided in an embodiment of this utility model;

[0038] Figure 2 This is a schematic diagram of the first sound-absorbing structure provided in this embodiment of the utility model;

[0039] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle;

[0040] Figure 4 This is a split schematic diagram of the sound-absorbing unit provided in an embodiment of the present invention;

[0041] Figure 5 This is a first-view structural schematic diagram of a housing with a second cover installed according to an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of the structure of the first sound-absorbing layer provided in an embodiment of the present invention;

[0043] Figure 7 This is a partial cross-sectional view of the first sound-absorbing unit provided in this embodiment of the utility model;

[0044] Figure 8 This is a partial cross-sectional view of the second sound-absorbing unit provided in this embodiment of the present invention;

[0045] Figure 9 This is a second-view structural schematic diagram of a housing with a second cover installed, provided by an embodiment of the present utility model;

[0046] Figure 10 This is a schematic diagram of the second sound-absorbing structure provided in this embodiment of the utility model;

[0047] Figure 11 This is a partial cross-sectional view of the noise reduction structure of a gas water heater according to the first embodiment of this utility model;

[0048] Figure 12 This is a partial cross-sectional view of a second type of noise reduction structure for a gas water heater provided in this embodiment of the present invention;

[0049] Figure 13 This is a partial cross-sectional view of a third type of noise reduction structure for a gas water heater provided in this utility model embodiment.

[0050] In the picture:

[0051] 1. Outer shell; 11. First pipe hole; 12. Slide groove; 13. Mounting component; 14. Third pipe hole; 15. Second through-hole;

[0052] 2. Second cover plate; 21. Air inlet;

[0053] 3. Sound-absorbing structure; 31. Sound-absorbing unit; 311. Inner frame; 3111. Slide rail; 312. First sound-absorbing layer; 3121. First partition groove; 313. Second sound-absorbing layer; 314. Ventilation groove; 315. First air cavity; 316. Second air cavity; 317. Clearance hole; 318. First through-hole; 32. Sound insulation board; 321. Ventilation hole; 322. Second pipe hole; 33. Airflow channel;

[0054] 4. Heating device;

[0055] 100. Disassembly and assembly of inlet and outlet; 200. Air intake chamber. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0057] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0058] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0060] This utility model provides a noise reduction structure for a gas water heater, and a gas water heater including this noise reduction structure. It can improve the ease of replacing the sound-absorbing structure and the ease of maintenance of the internal structure of the gas water heater while ensuring noise reduction effect. It should be noted that in this utility model embodiment, the side of the gas water heater where the control panel is located is the front side, and the side of the gas water heater facing away from the control panel is the rear side. When the user stands facing the control panel, the user's left and right directions are the left and right directions of the gas water heater, and the height direction is the actual up and down direction.

[0061] like Figures 1 to 5 As shown, the noise reduction structure of the gas water heater includes a sound-absorbing structure 3 and a shell 1. The sound-absorbing structure 3 includes a sound-absorbing unit 31, which includes an inner frame 311 extending through the front and rear direction of the gas water heater, a first sound-absorbing layer 312 disposed on the outer wall of the inner frame 311, and a second sound-absorbing layer 313 disposed on the inner wall of the inner frame 311. A disassembly / removal inlet / outlet 100 is provided at one end of the shell 1 in the front and rear direction. The sound-absorbing unit 31 is inserted into the shell 1 through the disassembly / removal inlet / outlet 100. The shell 1 is connected to a detachable first cover plate for sealing the disassembly / removal inlet / outlet 100. Exemplarily, the inner frame 311 is a rectangular frame, the first sound-absorbing layer 312 is disposed on the inner wall of the rectangular frame, and the second sound-absorbing layer 313 is disposed on the outer wall of the rectangular frame. Exemplarily, the disassembly / removal inlet / outlet 100 is located at the front end of the shell 1.

[0062] The gas water heater also includes a heating device 4 and the aforementioned gas water heater noise reduction structure, with the heating device 4 located inside the sound-absorbing structure 3.

[0063] By setting a sound-absorbing structure 3 inside the outer shell 1, and setting a first sound-absorbing layer 312 on the outer wall of the inner frame 311 and a second sound-absorbing layer 313 on the inner wall of the inner frame 311, a double-layer sound-absorbing unit 31 is formed. In specific applications, the heating device 4, which is one of the noise sources, is installed inside the sound-absorbing structure. In this way, the overall noise reduction effect of the gas water heater during operation can be improved, thereby improving the user experience.

[0064] Since the sound-absorbing unit 31 is inserted into the outer casing 1 through the disassembly and assembly inlet / outlet 100, when it is necessary to replace the sound-absorbing unit 31 or to repair the heating device 4, it is only necessary to remove the first cover plate and pull out the sound-absorbing unit 31 to replace it. After removing the sound-absorbing unit 31, the space around the heating device 4 is increased, which makes it easier for maintenance personnel to repair the heating device 4 without having to disassemble the entire heating device 4, thus improving the convenience and efficiency of maintenance. It also eliminates the need to replace the outer casing 1 with a larger one, which is conducive to the miniaturization of gas water heaters and reduces the cost of gas water heaters.

[0065] In some embodiments, the first sound-absorbing layer 312 is polyester fiber sound-absorbing cotton, and the second sound-absorbing layer 313 is glass wool. This design can reduce the cost and weight of the gas water heater while ensuring sound absorption. It should be noted that the first sound-absorbing layer 312 can also be made of rubber-plastic eggshell cotton or polyurethane foam, and the second sound-absorbing layer 313 can also be made of rock wool or aluminum silicate fiber cotton. When setting the first sound-absorbing layer 312 and the second sound-absorbing layer 313, since the second sound-absorbing layer 313 is closer to the heating device 4 than the first sound-absorbing layer 312, the ambient temperature of the second sound-absorbing layer 313 is higher. Therefore, the high-temperature resistance of the second sound-absorbing layer 313 is required to be superior to that of the first sound-absorbing layer 312.

[0066] In some embodiments, the first sound-absorbing layer 312 is adhered to the outer wall surface of the inner frame 311, and the second sound-absorbing layer 313 is adhered to the inner wall surface of the inner frame 311. The inner frame 311 primarily serves a supporting function for both the first and second sound-absorbing layers 312 and 313. After prolonged use, the first and second sound-absorbing layers 312 and 313 age, thus requiring periodic replacement. Adhesive bonding of the first sound-absorbing layer 312 to the outer wall surface of the inner frame 311 and the second sound-absorbing layer 313 to the inner wall surface not only ensures a strong connection between the first and second sound-absorbing layers 312 and 313 and the inner frame 311, but also facilitates the removal of the old first and second sound-absorbing layers 312 and 313 during replacement, allowing the new first and second sound-absorbing layers 312 and 313 to be adhered to the inner frame 311.

[0067] In some embodiments, such as Figures 1 to 5 As shown, one of the inner frame 311 and the outer shell 1 is provided with a slide groove 12, and the other is provided with a slide rail 3111. The slide groove 12 is opened at one end near the disassembly and assembly inlet / outlet 100. The slide rail 3111 can move in and out of the slide groove 12 in the front-back direction. The slide rail 3111 and the slide groove 12 slide in the front-back direction.

[0068] By utilizing the sliding engagement of the slide groove 12 and the slide rail 3111 in the front-to-back direction, the sound-absorbing unit 31 can be removed from the housing 1 or installed into the housing 1 simply by pulling out the sound-absorbing unit 31. The sound-absorbing unit 31 is easy and quick to install and remove, which helps to improve the efficiency of the installation and removal of the sound-absorbing unit 31.

[0069] For example, the slide groove 12 is disposed on the outer shell 1, and the slide rail 3111 is disposed on the inner frame 311. Both the slide groove 12 and the slide rail 3111 have a T-shaped cross section perpendicular to the front-back direction. As an alternative, the slide groove 12 and the slide rail 3111 can also adopt a dovetail structure; the slide groove 12 can also be disposed on the inner frame 311, and the slide rail 3111 can be disposed on the outer shell 1.

[0070] For example, both the upper and lower ends of the outer casing 1 are provided with two sliding grooves 12 arranged at intervals along the left and right direction. The slide rail 3111 and the sliding groove 12 are arranged in a one-to-one correspondence to improve the stability of the pull-out sound insulation structure. It should be noted that the number of sliding grooves 12 is not limited to two, but can also be one, three or more, and two sliding grooves 12 arranged at intervals along the height direction can also be provided on both the left and right sides of the outer casing 1.

[0071] In some embodiments, such as Figure 6 and Figure 7 As shown, at least one of the opposite sides of the first sound-absorbing layer 312 and the inner frame 311 is provided with a first partition groove 3121. The first sound-absorbing layer 312 is attached to the outer wall of the inner frame 311, thus sealing the opening of the first partition groove 3121 to form a first air cavity 315. By setting the first air cavity 315, noise enters the first air cavity 315 through the inner frame 311 and is reflected back and forth, making the sound absorption effect of the first sound-absorbing layer 312 and the second sound-absorbing layer 313 more effective and improving the noise reduction effect.

[0072] For example, such as Figure 6 and 7 As shown, a first partition groove 3121 is formed on the side of the first sound-absorbing layer 312 facing the inner frame 311. As an alternative, the first partition groove 3121 can also be formed on the side of the inner frame 311 facing the first sound-absorbing layer 312, or the first partition groove 3121 can be formed on both the side of the first sound-absorbing layer 312 facing the inner frame 311 and the side of the inner frame 311 facing the first sound-absorbing layer 312.

[0073] As an alternative, such as Figure 8 As shown, at least one of the opposite sides of the second sound-absorbing layer 313 and the inner frame 311 may be provided with a second partition groove, and the second sound-absorbing layer 313 is attached to the inner wall surface of the inner frame 311 so that the opening of the second partition groove is blocked to form a second air cavity 316. Figure 8 As shown, a first air cavity 315 can also be provided between the first sound-absorbing layer 312 and the inner frame 311, while a second air cavity 316 can be provided between the second sound-absorbing layer 313 and the inner frame 311.

[0074] In some embodiments, such as Figure 5 and Figure 9As shown, the outer casing 1 has a second cover plate 2 disposed opposite to the first cover plate in the front-rear direction. The second cover plate 2 is used to block the opening of the outer casing 1 at the end away from the disassembly / assembly inlet / outlet 100 in the front-rear direction. The sound-absorbing structure 3 also includes a sound-insulating plate 32 disposed inside the outer casing 1 and disposed opposite to the second cover plate 2. The sound-absorbing unit 31 is located on the front side of the sound-insulating plate 32 and abuts against the sound-insulating plate 32 in the front-rear direction. Specifically, the outer casing 1 is disposed through in the front-rear direction, and the second cover plate 2 blocks the rear opening of the outer casing 1. It should be noted that the connection method between the second cover plate 2 and the outer casing 1 is prior art in the art and will not be described in detail here. The inner cavity of the sound-absorbing structure 3 refers to the cuboid-shaped chamber formed by the sound-absorbing unit 31 and the sound-insulating plate 32.

[0075] By installing a sound insulation plate 32 behind the sound absorption unit 31, noise reduction can be achieved in all four directions (up, down, left, and right) of the heating device 4, as well as behind the heating device 4, thereby further improving the noise reduction effect of the gas water heater. Moreover, the sound insulation plate 32 is installed behind the sound absorption unit 31, and its installation does not affect the disassembly of the sound absorption unit 31.

[0076] It should be noted that the sound insulation panel 32 can be made of commonly used existing technologies, such as a panel with a polymer damping material sandwiched between two panels, or a sound insulation felt, or a rubber layer, etc. The choice can be made according to the actual noise reduction needs and cost, and will not be specifically limited here.

[0077] In some embodiments, such as Figure 9 and Figure 11 As shown, the inner cavity of the outer shell 1 has a mounting plane facing the second cover plate 2. The sound insulation panel 32 abuts against the mounting plane. The second cover plate 2 has a protruding pressing part on the side facing the sound insulation panel 32, which presses against the mounting plane. The sound insulation panel 32 is detachably installed on the outer shell 1. Simply fixing the second cover plate 2 to the outer shell 1 allows the sound insulation panel 32 to be sandwiched between the mounting plane and the sound insulation panel 32, making the installation and removal of the sound insulation panel 32 convenient.

[0078] For example, mounting members 13 are provided on opposite sides of the second cover plate 2. One end of the mounting member 13 is connected to the outer casing 1 by fasteners, and the other end is pressed forward against the rear side of the second cover plate 2.

[0079] Specifically, the rear end face of the outer shell 1 is provided with a threaded hole. After the fastener passes through the mounting part 13, it is threaded into the threaded hole to connect the mounting part 13 to the outer shell 1, so that the second cover plate 2 can be clamped between the mounting part 13 and the sound insulation plate 32.

[0080] In some embodiments, such as Figure 2 , Figure 3 , Figure 9 and Figure 11As shown, the second cover plate 2 and the sound insulation plate 32 are spaced apart in the front-to-back direction to form an air intake cavity 200. The second cover plate 2 is provided with an air intake hole 21 that connects to the air intake cavity 200. The sound absorption structure 3 is provided with multiple airflow channels 33. The air intake cavity 200 is connected to the inner cavity of the sound absorption structure 3 through the airflow channels 33. The air intake hole 21 is located in the area enclosed by all the airflow channels 33.

[0081] Since gas water heater combustion requires air, external air enters the air intake chamber 200 through the air intake hole 21, and then enters the inner cavity of the sound absorption structure 3 through the airflow channel 33, so as to provide the heating device 4 arranged in the inner cavity of the sound absorption structure 3 for operation, thereby ensuring the normal operation of the heating device 4.

[0082] By placing the air inlet 21 within the area enclosed by all the airflow channels 33, the air entering the air intake chamber 200 through the air inlet 21 is reflected back and forth between the sound insulation plate 32 and the second cover plate 2, increasing the number of reflections and helping to reduce the noise level when the air enters the inner cavity of the sound absorption structure 3.

[0083] For example, multiple air inlets 21 are provided, and the multiple air inlets 21 are divided into two groups. Each group of air inlets 21 is arranged in an array along the height direction and the left and right direction to meet the air intake requirements of the gas water heater.

[0084] Specifically, such as Figure 2 , Figure 5 and Figure 9 As shown, the rear end face of the sound-absorbing unit 31 is provided with a plurality of ventilation grooves 314 arranged at intervals along its circumference, one end of the ventilation groove 314 extending through to the inner wall of the sound-absorbing unit 31; the sound insulation plate 32 is provided with ventilation holes 321 extending through its thickness direction, the ventilation holes 321 are correspondingly provided with the ventilation grooves 314, and the front end of the ventilation hole 321 is at least partially facing the corresponding ventilation groove 314, so that the ventilation hole 321 and the corresponding ventilation groove 314 are connected to form an airflow channel 33.

[0085] This configuration extends the airflow path from the air inlet 21 into the air intake chamber 200 to the airflow channel 33, thereby further increasing the number of reflections between the sound insulation plate 32 and the second cover plate 2 and improving the noise reduction effect. Moreover, when the air flows through the ventilation groove 314, the sound absorption structure 3 can also absorb noise and improve the noise reduction effect.

[0086] For example, each ventilation slot 314 is provided with a ventilation hole 321. The ventilation slot 314 is a U-shaped slot, and one end of the U-shaped slot on the sound-absorbing unit 31 extends through to the outer wall surface of the sound-absorbing unit 31. The ventilation hole 321 is a U-shaped hole opened on the outer peripheral wall of the sound insulation plate 32. The bottom wall of the ventilation hole 321 is located between the outer wall surface and the inner wall surface of the sound-absorbing unit 31, so that the ventilation hole 321 and the corresponding ventilation slot 314 are connected.

[0087] As an alternative, such as Figure 10 As shown, an airflow channel 33 can also be formed on the sound insulation panel 32, extending through its thickness. A portion of the front opening of the airflow channel 33 is blocked by the rear end face of the sound absorption unit 31, while the other portion is located inside the sound absorption unit 31. In this case, it is unnecessary to form a ventilation slot 314 on the sound absorption unit 31. To ensure that the air inlet chamber 200 is connected to the inner cavity of the sound absorption structure 3 through the airflow channel 33, a portion of each airflow channel 33 must be located on the side of the inner wall of the sound absorption unit 31 facing away from the outer wall of the sound absorption unit 31.

[0088] In some embodiments, such as Figure 1 and Figure 11 As shown, the gas water heater also includes a mounting bracket, and the heating device 4 is mounted on the mounting bracket; the outer shell 1 is provided with a sound insulation plate 32 located behind the sound absorption unit 31, the mounting bracket passes through the sound insulation plate 32, one end of the mounting bracket is placed in the air inlet cavity 200 and fixed to the bottom wall of the outer shell 1, and the other end is placed in the inner cavity of the sound absorption structure 3.

[0089] The installation requirements of the heating device 4 are met by setting up an installation bracket; the installation bracket is inserted through the sound insulation plate 32, and one end of the installation bracket is placed in the air inlet cavity 200, and the other end is placed in the inner cavity of the sound absorption structure 3, so as to avoid the installation bracket affecting the space between the outer shell 1 and the heating device 4 through the disassembly and assembly inlet and outlet 100 of the sound absorption structure 3.

[0090] In some embodiments, such as Figure 11 As shown, the gas water heater also includes pipes, including a gas pipe and inlet / outlet water pipes; a sound insulation plate 32 is provided inside the outer casing 1 behind the sound absorption unit 31, and the pipes extend from the bottom wall of the outer casing 1 into the air intake chamber 200, and after passing through the sound insulation plate 32, the pipes extend into the inner cavity of the sound absorption structure 3. It should be noted that the inlet and outlet water pipes refer to the cold water inlet pipe and the hot water outlet pipe of the gas water heater.

[0091] This configuration satisfies the requirements for pipe layout while preventing the pipe layout from affecting the installation and removal of the sound-absorbing unit 31.

[0092] Specifically, the bottom wall of the outer shell 1 is provided with a first through hole 11 that runs vertically through the bottom. The upper end of the first through hole 11 is connected to the air intake chamber 200. The sound insulation plate 32 is provided with a second through hole 322 that runs from front to back through the top and bottom. The rear end of the second through hole 322 is connected to the air intake chamber 200, and the front end of the second through hole 322 is connected to the inner cavity of the sound absorption structure 3, so that the pipe can be extended into the air intake chamber 200 through the first through hole 11 and then into the inner cavity of the sound absorption structure 3 through the second through hole 322.

[0093] To prevent the sound insulation panel 32 from affecting its noise reduction effect due to the second pipe hole 322, a sealing element, such as heat insulation adhesive or heat insulation pad, is installed between the inner peripheral wall of the second pipe hole 322 and the outer peripheral wall of the pipe. This design can prevent the vibration of the gas water heater during operation from being transmitted to the pipe and causing the pipe to shake, and can also prevent air in the air intake chamber 200 from entering the inner cavity of the sound absorption structure 3 through the gap between the inner peripheral wall of the second pipe hole 322 and the outer peripheral wall of the pipe, thus preventing noise from increasing.

[0094] As an alternative, such as Figure 12 As shown, the bottom wall of the sound-absorbing unit 31 is provided with a clearance hole 317. The rear end of the clearance hole 317 extends to the rear end face of the sound-absorbing structure 3 to form an inlet / outlet opening. The clearance hole 317 is arranged vertically through the bottom wall of the sound-absorbing structure 3. The pipe passes through the bottom wall of the outer shell 1 and the clearance hole 317 and then extends into the inner cavity of the sound-absorbing structure 3. The pipe can enter and exit the clearance hole 317 through the inlet / outlet opening. Specifically, the bottom wall of the outer shell 1 is provided with a third pipe hole 14. The third pipe hole 14 is located directly below the clearance hole 317, which facilitates the pipe to enter the outer shell 1 through the third pipe hole 14 and then enter the inner cavity of the sound-absorbing structure 3 through the clearance hole 317.

[0095] After the sound-absorbing unit 31 is installed, heat-insulating adhesive is filled into the clearance hole 317 located between the pipe and the rear end face of the sound-absorbing unit 31. This not only reduces the impact of the high-temperature environment inside the sound-absorbing structure 3 on the service life of the outer shell 1, but also improves the noise reduction effect. Moreover, the heat-insulating adhesive is easy to remove. When disassembling the sound-absorbing unit 31 later, the sound-absorbing unit 31 can be pulled out through the disassembly inlet and outlet 100. The clearance hole 317 not only meets the needs of pipe penetration, but also, since the rear end of the clearance hole 317 extends to the rear end face of the sound-absorbing unit 31 to form an inlet and outlet opening, the pipes passing through the clearance hole 317 will not affect the subsequent disassembly of the sound-absorbing structure 3.

[0096] As an alternative, such as Figure 13 As shown, the bottom wall of the sound-absorbing unit 31 is provided with a first through-hole 318, which is located in front of the rear end face of the sound-absorbing unit 31. The pipe includes a first pipe section and a second pipe section. The first pipe section passes through the bottom wall of the outer shell 1 and the first through-hole 318 and extends into the inner cavity of the sound-absorbing structure 3. The second pipe section is located in the inner cavity of the sound-absorbing structure 3. The first pipe section and the second pipe section are detachably and sealed together. Specifically, the bottom wall of the outer shell 1 is provided with a second through-hole 15, which is located directly above the first through-hole 318, so that the pipe can pass through the second through-hole 15 into the outer shell 1 and then extend into the inner cavity of the sound-absorbing structure 3 through the first through-hole 318.

[0097] When it is necessary to disassemble the sound-absorbing unit 31, the connection between the first tube and the second tube can be disconnected, and then the first tube can be pulled down to completely exit the sound-absorbing unit 31. After that, the sound-absorbing unit 31 can be pulled forward directly.

[0098] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0099] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A noise reduction structure for a gas water heater, characterized in that, include: The sound-absorbing structure (3) includes a sound-absorbing unit (31), wherein the sound-absorbing unit (31) includes an inner frame (311) arranged through the front and rear direction of the gas water heater, a first sound-absorbing layer (312) disposed on the outer wall of the inner frame (311), and a second sound-absorbing layer (313) disposed on the inner wall of the inner frame (311). The outer shell (1) has a disassembly and assembly inlet (100) at one end in the front-rear direction. The sound-absorbing unit (31) is inserted into the outer shell (1) through the disassembly and assembly inlet (100). The outer shell (1) is connected to a detachable first cover plate for sealing the disassembly and assembly inlet (100).

2. The noise reduction structure for a gas water heater according to claim 1, characterized in that, One of the inner frame (311) and the outer shell (1) is provided with a slide groove (12), and the other is provided with a slide rail (3111). The slide groove (12) is opened at one end near the disassembly and assembly inlet / outlet (100). The slide rail (3111) can move in and out of the slide groove (12) in the front-back direction. The slide rail (3111) and the slide groove (12) slide in the front-back direction.

3. The noise reduction structure for a gas water heater according to claim 1, characterized in that, At least one of the opposite sides of the first sound-absorbing layer (312) and the inner frame (311) is provided with a first partition groove (3121). The first sound-absorbing layer (312) is attached to the outer wall of the inner frame (311) so that the opening of the first partition groove (3121) is blocked to form a first air cavity (315). And / or, at least one of the opposite sides of the second sound-absorbing layer (313) and the inner frame (311) is provided with a second partition groove, and the second sound-absorbing layer (313) is attached to the inner wall surface of the inner frame (311) so that the opening of the second partition groove is blocked to form a second air cavity (316).

4. The noise reduction structure for a gas water heater according to any one of claims 1 to 3, characterized in that, The first sound-absorbing layer (312) is polyester fiber sound-absorbing cotton, or rubber and plastic egg cotton, or polyurethane foam; And / or, the second sound-absorbing layer (313) is glass wool, or rock wool, or aluminum silicate fiber wool.

5. The noise reduction structure for a gas water heater according to any one of claims 1 to 3, characterized in that, The outer casing (1) has a second cover plate (2) disposed opposite to the first cover plate in the front-back direction. The second cover plate (2) is used to block the opening of the outer casing (1) away from the disassembly and assembly inlet / outlet (100) in the front-back direction. The sound-absorbing structure (3) further includes a sound insulation plate (32) disposed inside the outer shell (1) and opposite to the second cover plate (2), and the sound-absorbing unit (31) is located on the front side of the sound insulation plate (32) and abuts against the sound insulation plate (32) in the front-back direction.

6. The noise reduction structure for a gas water heater according to claim 5, characterized in that, The second cover plate (2) and the sound insulation plate (32) are spaced apart in the front-to-back direction and form an air inlet cavity (200). The second cover plate (2) is provided with an air inlet hole (21) that communicates with the air inlet cavity (200). The sound-absorbing structure is provided with multiple airflow channels (33), the air inlet cavity (200) is connected to the inner cavity of the sound-absorbing structure (3) through the airflow channels (33), and the air inlet (21) is located in the area enclosed by all the airflow channels (33).

7. The noise reduction structure for a gas water heater according to claim 6, characterized in that, The rear end face of the sound-absorbing unit (31) is provided with a plurality of ventilation slots (314) arranged at intervals around its perimeter. One end of each ventilation slot (314) extends through to the inner wall of the sound-absorbing unit (31). The sound insulation plate (32) is provided with ventilation holes (321) that extend through its thickness direction. Each ventilation hole (321) is corresponding to a ventilation slot (314). At least part of the front end of each ventilation hole (321) is positioned directly opposite the corresponding ventilation slot (314), so that the ventilation hole (321) and the corresponding ventilation slot (314) are connected to form the airflow channel (33). Alternatively, the sound insulation plate (32) may have an airflow channel (33) extending through its thickness direction. Part of the front opening of the airflow channel (33) is blocked by the rear end face of the sound absorption unit (31), and the other part is located inside the sound absorption unit (31).

8. A gas-fired water heater, characterized in that, It includes a heating device (4) and a noise reduction structure for a gas water heater as described in any one of claims 1 to 7, wherein the heating device (4) is located in the inner cavity of the sound-absorbing structure (3).

9. The gas water heater according to claim 8, characterized in that, The gas water heater also includes a mounting bracket, and the heating device (4) is mounted on the mounting bracket; The outer shell (1) is provided with a sound insulation plate (32) located behind the sound absorption unit (31). The second cover plate (2) of the outer shell (1) and the sound insulation plate (32) are spaced apart in the front-back direction and form an air intake cavity (200). The mounting bracket passes through the sound insulation plate (32). One end of the mounting bracket is placed in the air intake cavity (200) and fixed to the bottom wall of the outer shell (1), and the other end is placed in the inner cavity of the sound absorption structure (3).

10. The gas water heater according to claim 8, characterized in that, The gas water heater also includes pipes, which include a gas pipe and / or inlet and outlet water pipes; The outer casing (1) contains a sound insulation plate (32) located behind the sound-absorbing unit (31). The second cover plate (2) of the outer casing (1) and the sound insulation plate (32) are spaced apart in the front-rear direction and form an air intake chamber (200). The pipe extends from the bottom wall of the outer casing (1) into the air intake chamber (200). After passing through the sound insulation plate (32), the pipe extends into the inner cavity of the sound-absorbing structure (3); or, The bottom wall of the sound-absorbing unit (31) is provided with a clearance hole (317). The rear end of the clearance hole (317) extends to the rear end face of the sound-absorbing unit (31) to form an inlet / outlet opening. The clearance hole (317) is provided vertically through the bottom wall of the sound-absorbing unit (31). The pipe passes through the bottom wall of the outer shell (1) and the clearance hole (317) and then extends into the inner cavity of the sound-absorbing structure (3). The pipe can enter and exit the clearance hole (317) through the inlet / outlet opening; or, The bottom wall of the sound-absorbing unit (31) is provided with a first through hole (318). The first through hole (318) is located in front of the rear end face of the sound-absorbing unit (31). The pipe includes a first pipe section and a second pipe section. The first pipe section passes through the bottom wall of the outer shell (1) and the first through hole (318) and extends into the inner cavity of the sound-absorbing structure (3). The second pipe section is located in the inner cavity of the sound-absorbing unit (31). The first pipe section and the second pipe section are detachably and sealed together.

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