Gas water heater

Abstract

The present application relates to the technical field of household appliances, and provides a gas water heater, which comprises a bottom shell, the bottom shell being provided with an opening; a burner, the burner being installed on the bottom shell; and a cover plate assembly, the cover plate assembly being installed on the bottom shell and covering the opening, the cover plate assembly comprising a first cover plate and a second cover plate, the second cover plate being located between the burner and the first cover plate, the cover plate assembly being provided with an air inlet channel between the first cover plate and the second cover plate, the first cover plate being provided with a first air inlet opening communicating with the air inlet channel, and the second cover plate being provided with a second air inlet opening at a position away from the first air inlet opening, the second air inlet opening communicating the air inlet channel with an air inlet of the burner. The gas water heater provided by the present application is provided with a multi-layer cover plate structure, each layer of the cover plate can weaken the internal noise, and the cavity between the cover plates forms a long air inlet channel, which can greatly increase the path length of the noise along the air inlet channel to propagate outward, effectively improve the transmission loss of the noise to propagate outward, and greatly reduce the flow channel resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a gas water heater. BACKGROUND

[0002] The gas water heater is the most convenient and economical device for rapidly heating water at present, and its energy conversion efficiency is more than 90%. Compared with the electric water heater, the gas water heater is more energy-saving. However, the gas water heater will generate a large noise during normal operation, which will bring a bad experience to people who are active near the water heater. SUMMARY

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a gas water heater to greatly reduce the noise and air intake resistance.

[0004] According to the gas water heater of the first aspect of the present application, it comprises:

[0005] A bottom shell having an open mouth;

[0006] A burner mounted on the bottom shell;

[0007] A cover plate assembly mounted on the bottom shell and covering the open mouth, the cover plate assembly comprising a first cover plate and a second cover plate, the second cover plate being located between the burner and the first cover plate, the cover plate assembly having an air inlet channel located between the first cover plate and the second cover plate, the first cover plate being provided with a first air inlet opening communicating with the air inlet channel, and the second cover plate being provided with a second air inlet opening at a position away from the first air inlet opening, the second air inlet opening communicating the air inlet channel with an air inlet of the burner.

[0008] According to the gas water heater of the present application, by arranging a multi-layer cover plate structure, each layer of cover plate can weaken the internal noise and enhance the sound insulation effect. Moreover, a long air inlet channel is formed by the cavities between the cover plates, which can greatly increase the path length of the noise propagating along the air inlet channel to the outside, effectively improve the transmission loss of the noise propagating to the outside, and basically eliminate the air intake noise, thereby greatly reducing the flow channel resistance.

[0009] According to one embodiment of the present application, the second air inlet opening comprises a first group of through holes and a second group of through holes, the first group of through holes being arranged at a position close to a primary air inlet of the burner, and the second group of through holes being arranged at a position close to a secondary air inlet of the burner.

[0010] By independently designing the first group of through holes and the second group of through holes for the primary air inlet and the secondary air inlet, the flow ratio of the primary air intake and the secondary air intake can be improved, which helps the burner to obtain better combustion effect and reduce the content of harmful gases such as CO in the flue gas.

[0011] According to one embodiment of the present application, the flow passage cross-sectional area of the first group of through holes is A1, and the flow passage cross-sectional area of the second group of through holes is A2, satisfying: 1≤A1 / A2≤2.

[0012] According to one embodiment of the present application, the flow passage cross-sectional area of the first air inlet is P1, and the flow passage cross-sectional area of the second air inlet is P2, satisfying: 1.5≤P2 / P1≤3.

[0013] By designing the second air inlet located inside to have a flow passage cross-sectional area greater than the first air inlet located outside, the flow channel resistance caused by the air inlet channel can be eliminated, further reducing the turbulent flow noise in the air inlet channel, and preventing the generation of acoustic whistling at the second air inlet.

[0014] According to one embodiment of the present application, the burner is installed in the lower region of the bottom shell, the second air inlet is located in the lower region of the second cover plate, and the first air inlet is located in the upper region of the first cover plate.

[0015] In this way, the length of the air inlet channel is substantially equivalent to the height of the entire machine, which can greatly increase the path length of noise propagating outward along the air inlet channel, and the first air inlet located outside is at the top end, which will be substantially in the area close to the ceiling in the room when the entire machine is installed on the wall, and will not bring the user a wind feeling, providing a better user experience.

[0016] According to one embodiment of the present application, the first cover plate is provided with a side wall plate facing the bottom shell, the side wall plate is provided with a folded edge bent inward, and the second cover plate is installed on the side of the folded edge away from the bottom shell.

[0017] According to one embodiment of the present application, a sound-absorbing component is arranged in the air inlet channel, and the sound-absorbing component is installed on at least one of the first cover plate and the second cover plate.

[0018] According to one embodiment of the present application, the sound-absorbing component includes a plurality of regions corresponding to different positions of the bottom shell in the front-rear direction, respectively, and the sound-absorbing parameters of the sound-absorbing component in at least two of the regions are different.

[0019] According to one embodiment of the present application, the sound-absorbing component has a sound-absorbing cavity, and the wall surface of the sound-absorbing cavity facing the bottom shell is provided with a sound-absorbing hole.

[0020] According to one embodiment of the present application, the sound-absorbing cavity is a plurality of sound-absorbing cavities, and the plurality of sound-absorbing cavities are arranged in an array, and each of the sound-absorbing cavities corresponds to a plurality of sound-absorbing holes arranged in an array.

[0021] According to one embodiment of the present application, at least one of the volume of the at least two sound-absorbing cavities, the flow area of the sound-absorbing holes corresponding to the at least two sound-absorbing cavities, and the density of the sound-absorbing holes corresponding to the at least two sound-absorbing cavities is different.

[0022] According to one embodiment of the present application, the sound-absorbing component comprises a plurality of baffles, and the angle between the normal line of at least part of the baffles and the direction of the airflow in the air inlet is less than 30°.

[0023] According to one embodiment of the present application, the baffles are arc-shaped and curved away from the first air inlet.

[0024] According to one embodiment of the present application, a sealing gasket is clamped between the cover plate assembly and the bottom shell.

[0025] The one or more technical solutions described above in the embodiments of the present application have at least one of the following technical effects:

[0026] By arranging the multi-layer cover plate structure, each layer of cover plate weakens the internal noise, enhances the sound insulation effect, and forms a longer air inlet by the cavities between the cover plates, which can greatly increase the path length of the noise along the air inlet to the outside, effectively improve the transmission loss of the noise to the outside, and substantially eliminate the air inlet noise and greatly reduce the flow passage resistance.

[0027] Further, by independently designing the first and second groups of through holes for the primary air inlet and the secondary air inlet, the flow ratio of the primary air and the secondary air can be improved, which helps the burner to obtain better combustion effect and reduce the harmful gas content such as CO in the flue gas.

[0028] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 is one of the exploded views of the gas water heater provided by the embodiments of the present application;

[0031] Figure 2 is the second exploded view of the gas water heater provided by the embodiments of the present application;

[0032] Figure 3is a structural schematic view of an air inlet of a gas water heater provided by an embodiment of the present application;

[0033] Figure 4 is a structural schematic view of a cover plate assembly of a gas water heater provided by an embodiment of the present application;

[0034] Figure 5 is a structural schematic view of a cover plate assembly of a gas water heater provided by an embodiment of the present application;

[0035] Figure 6 is an explosion view of a partial structure of a gas water heater provided by an embodiment of the present application;

[0036] Figure 7 is a structural schematic view of a sound attenuation component of a gas water heater provided by an embodiment of the present application;

[0037] Figure 8 is a structural schematic view of a sound attenuation component of a gas water heater provided by an embodiment of the present application;

[0038] Figure 9 is an explosion view of a partial structure of a gas water heater provided by an embodiment of the present application;

[0039] Figure 10 is a structural schematic view of a sound attenuation component of a gas water heater provided by an embodiment of the present application;

[0040] Figure 11 is a structural schematic view of a sound attenuation component of a gas water heater provided by an embodiment of the present application;

[0041] Figure 12 is a structural schematic view of a sound attenuation component of a gas water heater provided by an embodiment of the present application;

[0042] Figure 13 is a structural schematic view of a sound attenuation component of a gas water heater provided by an embodiment of the present application.

[0043] Reference signs:

[0044] bottom shell 100;

[0045] burner 140, heat exchanger 150, fan system 160, flue pipe 161, sealing gasket 171, sealing ring 172;

[0046] sound attenuation component 200, base body 210, sound attenuation cavity 220, first region 221, second region 222, sound attenuation hole 230, baffle 240, support plate 250;

[0047] first cover plate 310, first air inlet 311, side wall 312, flange 313;

[0048] The second cover plate 320, the second air inlet 321, the first group of through holes 322, and the second group of through holes 323.

[0049] The air inlet 330. DETAILED DESCRIPTION

[0050] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0051] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0052] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0054] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0055] The following describes the gas water heater according to an embodiment of the present application. Figures 1-13 The gas water heater according to an embodiment of the present application is described below.

[0056] As shown in Figure 1 and Figure 2 , the gas water heater according to an embodiment of the present application comprises a bottom shell 100, a burner 140 and a cover plate assembly.

[0057] The bottom shell 100 is used to support the main functional devices of the gas water heater, and the main functional devices of the gas water heater can be mounted to the bottom shell 100.

[0058] The bottom shell 100 has an opening, and the main functional devices of the gas water heater can be mounted to the bottom shell 100 from the opening.

[0059] The bottom shell 100 can be a shell structure, in some embodiments, the bottom shell 100 can be an integrated structure to minimize the gap between the bottom shell 100 and the rear mounting wall, or the bottom shell 100 can be an integrated non-porous structure. In this way, the radiation noise of the back of the gas water heater can be reduced, and the reflection of the back noise on the mounting wall can be weakened.

[0060] As shown in Figure 1 and Figure 2 , the bottom shell 100 can include a back plate at the rear end of the bottom shell 100, an opening at the front end of the bottom shell 100, and a side plate connected to the back plate, and the side plate can include four plates up, down, left and right, and the back plate and the side plate can be an integrated structure. In this way, there is no gap between the plates, and the noise transmitted backward can be reduced.

[0061] The bottom shell 100 can be a metal shell structure, so that the strength of the bottom shell 100 is large, and the fireproof performance is good; or the bottom shell 100 can be a plastic shell structure, so that the mass of the bottom shell 100 is light, and the molding is convenient, and the plastic bottom shell 100 can also be added with a fire retardant to enhance the fireproof performance.

[0062] The burner 140 is mounted to the bottom shell 100, and the burner 140 can be mounted to the bottom shell 100 by a threaded connection structure or a buckle or the like mounting structure.

[0063] As shown in Figure 1 , the gas water heater can further include a heat exchanger 150 mounted to the bottom shell 100, and the heat exchanger 150 can be in communication with the combustion chamber of the burner 140. The oxidant (air) enters the burner 140 from the air inlet of the burner 140, mixes with the gas and burns in the combustion chamber, and the water to be heated and the high-temperature air are exchanged in the heat exchanger 150. The heat exchanger 150 can be located at the upper end of the burner 140.

[0064] The gas water heater can be a natural air intake type and a forced exhaust type. For the forced exhaust type gas water heater, a fan system 160 can be further included, which can be mounted to the upper end of the heat exchanger 150 as shown in Figure 1 .

[0065] The cover plate assembly is mounted to the bottom shell 100 and covers the opening, and the cover plate assembly can be located at the front end of the bottom shell 100.

[0066] As shown in Figures 1-6 , the cover plate assembly includes a first cover plate 310 and a second cover plate 320. That is, the front end of the gas water heater is at least a double-layer cover plate structure.

[0067] The second cover plate 320 is located between the burner 140 and the first cover plate 310, and the bottom shell 100, the second cover plate 320, and the first cover plate 310 are sequentially arranged from back to front.

[0068] In this way, the working noise of the gas water heater needs to pass through at least the second cover plate 320 and the first cover plate 310 when it is transmitted forward, and the second cover plate 320 and the first cover plate 310 can reflect most of the working noise directly transmitted outward, and the second cover plate 320 and the first cover plate 310 can block the direct path of the noise.

[0069] As shown in Figure 3 , the cover plate assembly has an air inlet channel 330 located between the first cover plate 310 and the second cover plate 320, and the first cover plate 310 and the second cover plate 320 define the air inlet channel 330.

[0070] As shown in Figure 1 , Figure 3 and Figure 4 , the first cover plate 310 is provided with a first air inlet 311 in communication with the air inlet channel 330, and the first air inlet 311 can be a through hole formed in the first cover plate 310, which penetrates the first cover plate 310.

[0071] As shown in Figure 1 andFigure 4 As shown, the first air inlet 311 can include a plurality of through holes formed in the first cover plate 310, and the shape of the through holes can be various, including but not limited to parallelogram, triangle, circle and other polygons, etc.

[0072] The plurality of through holes of the first air inlet 311 can be symmetrically arranged along the central axis of the air inlet channel 330, so that the air intake is balanced, and the smoothness of the airflow in the air inlet channel 330 can be improved. For example, in the case of Figure 1 And Figure 4 In the embodiment shown, the first air inlet 311 includes a central triangular through hole and a plurality of parallelogram through holes symmetrically distributed on both sides of the triangular through hole.

[0073] The second cover plate 320 is provided with a second air inlet 321, and the second air inlet 321 communicates the air inlet channel 330 with the air inlet of the burner 140. As shown, Figure 1 And Figure 3 As shown, the second air inlet 321 is located at the position of the second cover plate 320 away from the first air inlet 311. For example, in the case that the first air inlet 311 is located at the lower part of the first cover plate 310, the second air inlet 321 is arranged at the upper part of the second cover plate 320; in the case that the first air inlet 311 is located at the upper part of the first cover plate 310, the second air inlet 321 is arranged at the lower part of the second cover plate 320. In this way, the length of the air inlet channel 330 is long enough.

[0074] The first cover plate 310 and the second cover plate 320 can be sheet metal structures, so that the fireproof performance and protection performance of the cover plate assembly are relatively strong.

[0075] The main function of the air inlet channel 330 is to introduce external air into the burner 140, but the working noise of the gas water heater will also be transmitted outward through the air inlet channel 330. The gas water heater of the embodiment of the present application can greatly increase the path length of the noise transmitted outward along the air inlet channel 330 through the design of at least double cover plates, with an increase of more than 500%, effectively improving the transmission loss of the noise transmitted outward.

[0076] In related technologies, some structures are also designed to extend the air inlet channel, but all are through pipeline structures. On the one hand, due to the limitation of the overall volume of the gas water heater, the length increase is limited, and on the other hand, the extended air inlet channel has a small flow area, which will generate air intake noise.

[0077] The gas water heater of the embodiment of the present application forms an air inlet channel 330 between the cover plates, the width of the air inlet channel 330 is equivalent to the width of the whole machine, the flow area of the air inlet channel 330 can be increased, the air inlet channel 330 is linear, the flow resistance is small, the cross-sectional area difference is small, the flow field in the flow channel flows uniformly, the air flow velocity gradient is small, the turbulent noise is small, the air inlet noise can be basically eliminated, and the air inlet pressure is basically not lost, and the combustion efficiency of the burner 140 is not affected.

[0078] In addition, in the related art, the air inlet holes are arranged on the back of the whole machine, and when the whole machine is installed on the wall, the distance between the air inlet holes and the wall is close, generally only 10mm-20mm, and the flow channel resistance is large.

[0079] The gas water heater of the embodiment of the present application is arranged on the front of the whole machine, the air inlet is not blocked by the external structure, the air inlet resistance of the air inlet channel 330 can be greatly reduced, and the overall flow channel resistance is reduced by 70% through test calculation.

[0080] According to the gas water heater of the embodiment of the present application, the multi-layer cover plate structure is arranged, each cover plate can weaken the internal noise, the sound insulation effect is enhanced, the long and wide air inlet channel 330 is formed by the cavities between the cover plates, the path length of the noise propagating outward along the air inlet channel 330 can be greatly increased, the transmission loss of the noise propagating outward is effectively improved, the air inlet noise can be basically eliminated, and the flow channel resistance can be greatly reduced.

[0081] In some embodiments, as shown in Figure 1 The burner 140 is arranged on the lower region of the bottom shell 100, the first air inlet 311 is arranged on the upper region of the first cover plate 310, and the second air inlet 321 is arranged on the lower region of the second cover plate 320.

[0082] In this way, the length of the air inlet channel 330 is basically equivalent to the height of the whole machine, the path length of the noise propagating outward along the air inlet channel 330 can be greatly increased, and the first air inlet 311 is arranged on the top, when the whole machine is installed on the wall, the first air inlet 311 is basically arranged in the area close to the roof in the room, the user will not feel the wind, and the use experience is better.

[0083] In some embodiments, the flow area of the first air inlet 311 is P1, the flow area of the second air inlet 321 is P2, and 1.5≤P2 / P1≤3 is met.

[0084] It can be understood that the second air inlet 321 located inside is designed to have a larger flow passage area than the first air inlet 311 located outside, which can eliminate the flow passage resistance caused by the air inlet passage 330, further reduce the turbulent noise in the air inlet passage 330, and prevent the generation of acoustic whistling at the second air inlet 321. For example, in some embodiments, P2 / P1=2, or P2 / P1=2.5.

[0085] In actual design, the flow passage area of the first air inlet 311 can be adjusted according to the maximum load of the gas water heater. The larger the maximum load of the gas water heater, the larger the flow passage area of the first air inlet 311, so as to ensure that the gas in the burner 140 can be fully burned. The maximum load of the gas water heater can be 25kW, 30kW or 34kW, etc., and the flow passage area P1 of the first air inlet 311 can be between 2000mm 2 3500mm 2 , such as P1=2500mm 2 .

[0086] In some embodiments, as shown in Figure 2 and Figure 5 , the second air inlet 321 can include a first hole group 322 and a second hole group 323. The first hole group 322 is arranged at the position of the primary air inlet close to the burner 140, and the second hole group 323 is arranged at the position of the secondary air inlet close to the burner 140.

[0087] It can be understood that the burner 140 includes a primary air inlet and a secondary air inlet. The primary air inlet is in communication with the gas inlet passage of the burner 140 and relies on the negative pressure generated by the high-speed passing gas to suck in air. The secondary air inlet directly introduces air. By independently designing the first hole group 322 and the second hole group 323 for the primary air inlet and the secondary air inlet, the flow ratio of the primary air and the secondary air can be improved, which helps the burner 140 to obtain better combustion effect and reduce the content of harmful gases such as CO in flue gas.

[0088] For example, the primary air inlet of the burner 140 in the embodiments shown in Figure 1 and Figure 2 is on the right side, and the secondary air inlet is at the bottom. Correspondingly, the first hole group 322 and the second hole group 323 shown in Figure 2 are designed. The first hole group 322 is located on the right side, and the second hole group is located on the left side. The length of the first hole group is longer and extends upward more to adapt to the primary air inlet.

[0089] The shape of the holes in the first hole group 322 and the second hole group 323 can be various, such as in Figure 2In the shown embodiment, the first group of through holes 322 and the second group of through holes 323 each include a plurality of long strip-shaped through holes, and the length of each through hole in the first group of through holes 322 is longer than the length of each through hole in the second group of through holes 323. Figure 5 In the shown embodiment, the first group of through holes 322 and the second group of through holes 323 each include a plurality of circular through holes, and the radius of each through hole in the first group of through holes 322 is larger than the radius of each through hole in the second group of through holes 323.

[0090] Of course, the first group of through holes 322 and the second group of through holes 323 can also be designed in other shapes, such as polygonal shapes, etc.

[0091] In some embodiments, the flow cross-sectional area of the first group of through holes 322 is A1, and the flow cross-sectional area of the second group of through holes 323 is A2, and 1≤A1 / A2≤2 is satisfied. By designing the flow cross-sectional area of the first group of through holes 322 to be larger, the proportion of the first intake can be increased, which helps to reduce the emission of harmful gases such as CO and NO. In actual design, the value of A1 / A2 can be adjusted according to the specific combustion conditions, such as A1 / A2=1.5 or A1 / A2=1.8, etc.

[0092] In some embodiments, as shown in Figure 3 As shown, the first cover plate 310 is provided with a side wall 312 facing the bottom shell 100, and the side wall 312 is provided with a inwardly bent flange 313, and the second cover plate 320 is mounted on the side of the flange 313 away from the bottom shell 100.

[0093] In this embodiment, the second cover plate 320 can be mounted inside the first cover plate 310, and the second cover plate 320 is located on the front side of the flange 313. In this way, the integrated cover plate assembly is easier to install, and only the first cover plate 310 needs to be mounted on the bottom shell 100, such as through a snap or threaded connection structure to assemble the flange 313 of the first cover plate 310 with the bottom shell 100.

[0094] Alternatively, a sealing structure can also be installed at the joint between the flange 313 of the first cover plate 310 and the bottom shell 100 to prevent noise from spreading out from the gap between the bottom shell 100 and the cover plate assembly.

[0095] For example, Figure 1 and Figure 2 As shown, a sealing gasket 171 is clamped between the cover plate assembly and the bottom shell 100, which can block the gap between the bottom shell 100 and the first cover plate 310 and cut off the path for the direct spread of noise outside. The shape of the sealing gasket 171 can be similar to the outer periphery of the bottom shell 100, such as a square ring shape. The sealing gasket 171 can be sealing cotton.

[0096] Of course, the second cover plate 320 can also be designed outside the first cover plate 310, as shown in Figure 4 andFigure 5 As shown, the second cover plate 320 is installed at the rear side of the first cover plate 310, and in assembly, the second cover plate 320 needs to be connected with the bottom shell 100, such as through a snap or threaded connection structure to connect the second cover plate 320 with the bottom shell 100.

[0097] Alternatively, the second cover plate 320 is located at the rear side of the first cover plate 310, and a sealing structure can also be installed at the abutting position of the second cover plate 320 and the bottom shell 100 to prevent noise from spreading out from the gap between the bottom shell 100 and the cover plate assembly. A sealing gasket 171 is clamped between the cover plate assembly and the bottom shell 100, which can block the gap between the bottom shell 100 and the second cover plate 320 and cut off the path for the direct spread of noise outside. The shape of the sealing gasket 171 can be similar to the outer periphery of the bottom shell 100, such as a square ring shape. The sealing gasket 171 can be sealing cotton.

[0098] As shown in Figure 1 and Figure 2 , the gas water heater can also include a sealing ring 172, the smoke pipe 161 of the fan system 160 penetrates the bottom shell 100, the sealing ring 172 is sleeved outside the smoke pipe 161, and the sealing ring 172 is clamped between the smoke pipe 161 and the bottom shell 100, so as to block the gap between the smoke pipe 161 and the bottom shell 100 and cut off the path for the direct spread of noise outside.

[0099] The sealing ring 172 can include two sub-segments with different outer diameters, so as to form a stepped surface on the outside of the sealing ring 172. In installation, the sub-segment with a shorter outer diameter is inserted into the through hole of the bottom shell 100, and the stepped surface is stopped against the top surface of the bottom shell 100, so as to form a sealing structure combined with multiple surfaces, and the sound insulation effect is better.

[0100] The sealing ring 172 can be made of silica gel material. The sealing ring 172 made of silica gel material is resistant to high temperature, which can prolong the aging time of the sealing ring 172 in the high temperature environment of the smoke pipe 161.

[0101] The gas water heater of the embodiment of the application can also include other sound-absorbing components 200, which can be installed in the air inlet passage 330. As shown in Figure 1 , Figure 2 and Figure 6 , the sound-absorbing component 200 is installed in at least one of the second cover plate 320 and the first cover plate 310. The thickness of the sound-absorbing component 200 in the front-rear direction is less than the thickness of the air inlet passage 330 in the front-rear direction, so that there is enough passage for the air flow.

[0102] The first cover plate 310 and the second cover plate 320 can reflect most of the working noise directly transmitted outward by themselves. In combination with the sound-absorbing component 200 arranged in the air inlet channel 330, a part of the noise is reflected by the second cover plate 320, most of the noise penetrating the second cover plate 320 is absorbed by the sound-absorbing component 200, and the remaining small amount of noise is reflected by the first cover plate 310, so that the sound-absorbing effect is better.

[0103] The sound-absorbing component 200 can be installed on the second cover plate 320 or the first cover plate 310 in various ways, including adhesion, clamping, or threaded connection.

[0104] The sound-absorbing component 200 can have various structural forms. The embodiments of the present application are described in detail from four different structural forms respectively.

[0105] I. The sound-absorbing component 200 is sound-absorbing cotton

[0106] In this embodiment, sound-absorbing cotton is arranged in the air inlet channel 330. The sound-absorbing cotton can be adhered to the first cover plate 310 or the second cover plate 320, and the thickness of the sound-absorbing cotton in the front-rear direction can be less than the width of the air inlet channel 330 in the front-rear direction. In this way, a large enough air inlet channel can be left to reduce the air inlet resistance.

[0107] The sound-absorbing cotton can include a plurality of regions with different parameters, and the plurality of regions are distributed in a direction perpendicular to the front-rear direction. The parameters include at least one of the bulk density and the thickness. In this way, the sound-absorbing effects of different regions are different, and the parameters of different regions of the sound-absorbing cotton can be designed according to the different noise characteristics of each part of the gas water heater.

[0108] The sound-absorbing component 200 includes a plurality of regions, and the plurality of regions correspond to different positions of the bottom shell 100 in the front-rear direction respectively. The sound-absorbing parameters of the sound-absorbing component 200 are different in at least two regions.

[0109] The inventor has found through research that the noise sources of the normal operation of the gas water heater include combustion noise, fan noise, gas injection noise, mechanical vibration noise, and water flow noise. The combustion noise has obvious low-frequency characteristics and strong penetration. The fan and water pump noise has obvious high-frequency characteristics and is sharp and piercing, and the auditory perception is poor.

[0110] By arranging a plurality of regions with different sound-absorbing parameters, various noises can be targetedly eliminated.

[0111] For example, the sound-absorbing cotton can include a first region and a second region. The first region is directed towards the burner 140 and the heat exchanger 150, and preferably, the first region is directed towards the combustion chamber of the burner 140 and the heat exchanger 150. The second region is directed towards the fan system 160. Here, the direction of A towards B means that the projections of A and B in the front-rear direction substantially coincide.

[0112] The first region has a greater volume than the second region, or the first region has a greater thickness than the second region.

[0113] II. The sound-damping component 200 is a porous sound-damping cavity structure

[0114] In this embodiment, the sound-damping component 200 has a sound-damping cavity 220, which is provided with sound-damping holes 230 towards the wall surface of the bottom shell 100.

[0115] As shown in Figures 6-8 The sound-damping component 200 includes a base body 210, which can be made of plastic, metal, ceramic or other materials.

[0116] The base body 210 is provided with a sound-damping cavity 220, which can be a cuboid, a sphere or other shapes. The region of the base body 210 without the sound-damping cavity 220 can be a thin-walled structure to reduce the weight of the sound-damping component 200.

[0117] The base body 210 is provided with sound-damping holes 230 towards the surface (rear surface) of the bottom shell 100, which are connected to the sound-damping cavity 220.

[0118] When the gas water heater is working, part of the noise is reflected by the second cover plate 320. Most of the noise that penetrates the second cover plate 320 will be transmitted to the sound-damping cavity 220 through the sound-damping holes 230, and can be absorbed through multiple reflections in the sound-damping cavity 220. A small number of noises will be reflected by the first cover plate 310, and the overall sound-damping effect will be better.

[0119] As shown in Figure 8 The sound-damping cavity 220 is in an array, and each sound-damping cavity 220 corresponds to a plurality of sound-damping holes 230 arranged in an array.

[0120] In this way, the noise of each region can be absorbed through the sound-damping holes 230 and the sound-damping cavity 220.

[0121] In some embodiments, at least one of the volume of the at least two sound-damping cavities 220, the flow area of the sound-damping holes 230 corresponding to the at least two sound-damping cavities 220, and the density of the sound-damping holes 230 corresponding to the at least two sound-damping cavities 220 is different.

[0122] In other words, at least one of the volume of the sound-damping cavity 220, the flow area of the sound-damping hole 230, and the density of the sound-damping hole 230 corresponding to the sound-damping cavity 220 is different, so that the sound-damping can be targeted according to the different frequency characteristics of the combustion noise, water flow noise and flow-induced noise of the gas water heater.

[0123] In some embodiments, as Figures 8-9As shown, the volume of the silencing cavity 220 facing the burner 140 and heat exchanger 150 is larger than the volume of the silencing cavity 220 facing the fan system 160.

[0124] The inventors discovered through research that the noise sources of a gas water heater during normal operation include: combustion noise, fan noise, gas injection noise, mechanical vibration noise, and water flow noise. Combustion noise has obvious low-frequency characteristics and strong penetrating power, while fan and water pump noise has obvious high-frequency characteristics, is sharp and piercing, and has poor auditory perception.

[0125] By designing the volume of the silencing cavity 220 facing the burner 140 and heat exchanger 150 to be larger, low-frequency noise can be better absorbed.

[0126] In some embodiments, the number of silencing holes 230 corresponding to the silencing chambers 220 facing the burner 140 and heat exchanger 150 is less than the number of silencing holes 230 corresponding to the silencing chambers 220 facing the fan system 160. By designing a greater number of silencing holes 230 corresponding to the silencing chambers 220 facing the fan system 160, high-frequency noise can be better absorbed.

[0127] In one embodiment, such as Figure 9 As shown, the substrate 210 may include a first region 221 and a second region 222. The first region 221 faces the burner 140 and the heat exchanger 150. Preferably, the first region 221 faces the combustion chamber of the burner 140 and the heat exchanger 150. The second region 222 faces the fan system 160. Here, A facing B means that the projections of A and B in the front-back direction are substantially coincident.

[0128] The volume of the silencing cavity 220 corresponding to the first region 221 is V1, the diameter of the silencing hole 230 corresponding to the first region 221 is D1, and the number of silencing holes 230 corresponding to each silencing cavity 220 in the first region 221 is N1, satisfying: 60mm 3 ≤V1≤455mm 3 0.6mm≤D1≤2mm, 50≤N1≤75; for example, V1=200mm 3 D1=1mm, N1=66. This type of first region 221 can effectively absorb noise with a frequency of approximately 300Hz.

[0129] The volume of the silencing cavity 220 corresponding to the second region 222 is V2, the diameter of the silencing hole 230 corresponding to the second region 222 is D2, and the number of silencing holes 230 corresponding to each silencing cavity 220 in the second region 222 is N2, satisfying: 10mm 3 ≤V2≤80mm 3 0.6mm≤D2≤2mm, 76≤N2≤120; for example, V1=50mm 3D1=1.2mm, N1=99. This type of second zone 222 can effectively absorb noise with a frequency of approximately 600Hz-800Hz.

[0130] III. The silencing component 200 is a labyrinth-type silencer.

[0131] In this embodiment, such as Figures 10-13 As shown, the muffler 200 includes a plurality of baffles 240, the angle between the normal of at least a portion of the baffle 240 and the airflow direction in the air intake 330 is less than 30°, and the plurality of baffles 240 are spaced apart to allow airflow.

[0132] In other words, the baffle 240 is basically oriented towards the line connecting the second air inlet 321 and the first air inlet 311, so that when noise is transmitted from the second air inlet 321 to the first air inlet 311, it can be reflected back by the baffle 240.

[0133] The labyrinth silencer allows noise to be reflected multiple times within the labyrinthine flow channel, consuming the energy of the noise and thus reducing noise levels. It can significantly weaken the noise transmitted outward through the intake duct 330.

[0134] like Figures 10-12 As shown, the baffle 240 can be arc-shaped, and the baffle 240 bends away from the first air inlet 311. In this way, the noise reflected by the baffle 240 is basically directed towards the second air inlet 321, and the baffle 240 provides little air intake resistance from the first air inlet 311 to the second air inlet 321.

[0135] like Figures 10-12 As shown, the number and distribution of baffles 240 can take many forms. For example... Figure 10 As shown, the baffles 240 are short in length, numerous in number, and symmetrically arranged on the left and right sides; as Figure 11 As shown, the baffles 240 are long, few in number, and symmetrically arranged on the left and right sides; Figure 12 As shown, the baffles 240 are long, few in number, and asymmetrically arranged.

[0136] Of course, the baffle 240 can be flat, such as Figure 13 As shown, the baffle 240 is flat, and multiple baffles 240 are spaced apart to allow air circulation.

[0137] Flat baffle 240 and curved baffle 240 can also be used interchangeably.

[0138] exist Figures 10-13 In the embodiment shown, the noise reduction component 200 includes a support plate 250 and baffles 240, both of which are installed on the support plate 250. The support plate 250 is then connected to the cover plate assembly. For example, the support plate 250 can be pasted onto the inner side of the first cover plate 310.

[0139] Four, the sound-absorbing component 200 is a combination of the above-mentioned various structures

[0140] For example, a combination of sound-absorbing cotton and porous sound-absorbing cavity structure: sound-absorbing cotton is used in the area facing the fan system 160, so that the noise in the medium-high frequency band of 600-1000 Hz can be better absorbed; porous sound-absorbing cavity structure is used in the area facing the burner 140 and the heat exchanger 150, so that the noise in the low frequency band of 300 Hz can be better absorbed.

[0141] Other combination forms will not be introduced one by one here.

[0142] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

[0143] The above embodiments are only used to illustrate the present application, but not limit the present application. Although the present application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present application do not deviate from the spirit and scope of the technical solutions of the present application, and should be covered in the scope of claims of the present application.

Claims

1. A gas water heater, characterised in that, The application relates to a gas stove, which comprises: a bottom shell with an opening; a burner installed on the bottom shell; a cover plate assembly installed on the bottom shell and covering the opening, the cover plate assembly comprising a first cover plate and a second cover plate, the second cover plate being located between the burner and the first cover plate, the cover plate assembly having an air inlet channel between the first cover plate and the second cover plate, the first cover plate being provided with a first air inlet opening communicating with the air inlet channel, and the second cover plate being provided with a second air inlet opening at a position away from the first air inlet opening, the second air inlet opening communicating the air inlet channel with an air inlet of the burner; the second air inlet opening comprising a first group of through holes and a second group of through holes, the first group of through holes being arranged at a position close to a primary air inlet of the burner, the primary air inlet communicating with a gas inlet channel of the burner, and the second group of through holes being arranged at a position close to a secondary air inlet of the burner, the secondary air inlet being used for introducing air; wherein the length of the first group of through holes is greater than the length of the second group of through holes.

2. The gas water heater of claim 1, wherein, the flow cross-sectional area of the first group of through holes is A1, and the flow cross-sectional area of the second group of through holes is A2, and 1<=A1 / A2<=2 is satisfied.

3. The gas water heater of claim 1, wherein, the flow cross-sectional area of the first air inlet opening is P1, and the flow cross-sectional area of the second air inlet opening is P2, and 1.5<=P2 / P1<=3 is satisfied.

4. The gas water heater of claim 1, wherein, the burner is installed on a lower region of the bottom shell, the second air inlet opening is located on a lower region of the second cover plate, and the first air inlet opening is located on an upper region of the first cover plate.

5. The gas water heater of claim 1, wherein, the first cover plate is provided with a side wall plate facing the bottom shell, the side wall plate is provided with a bent inward flange, and the second cover plate is installed on a side of the flange away from the bottom shell.

6. The gas water heater according to any one of claims 1 to 5, wherein, the air inlet channel is provided with a sound absorbing component, and the sound absorbing component is installed on at least one of the first cover plate and the second cover plate.

7. The gas water heater of claim 6, wherein, the sound absorbing component comprises a plurality of regions corresponding to different positions of the bottom shell in the front-rear direction, and the sound absorbing parameters of at least two of the regions are different.

8. The gas water heater of claim 6, wherein, the sound absorbing component has a sound absorbing cavity provided with sound absorbing holes on a wall surface facing the bottom shell.

9. The gas water heater of claim 8, wherein, a plurality of sound absorbing cavities are arranged in an array, and each sound absorbing cavity corresponds to a plurality of sound absorbing holes arranged in an array.

10. The gas water heater of claim 9, wherein, at least one of the volume of at least two sound absorbing cavities, the flow cross-sectional area of the sound absorbing holes corresponding to at least two sound absorbing cavities, and the density of the sound absorbing holes corresponding to at least two sound absorbing cavities is different.

11. The gas water heater of claim 6, wherein, the sound absorbing component comprises a plurality of baffles, and the normal line of at least a partial region of the baffles and the airflow direction in the air inlet channel form an angle less than 30 degrees.

12. The gas water heater of claim 11, wherein, the baffles are arc-shaped and curved in a direction away from the first air inlet opening.

13. The gas water heater according to any one of claims 1 to 5, wherein, a sealing gasket is clamped between the cover plate assembly and the bottom shell.

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