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, a burner installed on the front face of the bottom shell, a back cover plate installed on the back face of the bottom shell and defining an air inlet channel with the bottom shell, the back cover plate being provided with a first air inlet communicating with the air inlet channel, the bottom shell being provided with a second air inlet at a position away from the first air inlet, the second air inlet communicating with the air inlet of the burner and the air inlet channel, and a front cover plate installed on the front face of the bottom shell and located between the burner and the bottom shell. The gas water heater has the structure that the bottom shell and the back cover plate cooperate with each other, the bottom shell and the back cover plate weaken the internal noise, the sound insulation effect is enhanced, the cavity between the bottom shell and the back cover plate forms a long and wide air inlet channel, the path length of the noise along the air inlet channel to the outside is greatly increased, the transmission loss of the noise to the outside is effectively improved, and the flow channel resistance is greatly reduced.

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 moving around the water heater. SUMMARY

[0003] The present application aims at at least solving one of the problems existing in the prior art. To this end, the present application provides a gas water heater with good sound insulation effect.

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

[0005] a bottom shell;

[0006] a burner mounted on the front face of the bottom shell;

[0007] a rear cover plate mounted on the back face of the bottom shell and defining an air inlet channel with the bottom shell, the rear cover plate being provided with a first air inlet communicating with the air inlet channel, the bottom shell being provided with a second air inlet at a position away from the first air inlet, the second air inlet communicating with the air inlet of the burner and the air inlet channel;

[0008] a front cover plate mounted on the front face of the bottom shell, and the burner is located between the front cover plate and the bottom shell.

[0009] According to the gas water heater of the present application, the structure of the bottom shell and the rear cover plate is provided, and the bottom shell and the rear cover plate will weaken the internal noise, thereby enhancing the sound insulation effect. Moreover, the long and wide air inlet channel is formed by the cavity between the bottom shell and the rear cover plate, which can greatly increase the path length of the noise along the air inlet channel to the outside, effectively improve the transmission loss of the noise to the outside, and basically eliminate the air inlet noise and greatly reduce the flow channel resistance.

[0010] According to one embodiment of the present application, the inner side of the front cover plate is provided with a sound absorbing component.

[0011] 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 towards the bottom shell is provided with sound absorbing holes.

[0012] 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 sound absorbing cavity corresponds to a plurality of sound absorbing holes arranged in an array.

[0013] According to one embodiment of the present application, at least one of the volume of the sound attenuation cavity, the flow area of the sound attenuation hole corresponding to the sound attenuation cavity, and the density of the sound attenuation hole corresponding to the sound attenuation cavity is different.

[0014] According to one embodiment of the present application, further comprising: a heat exchanger and a fan system, wherein the heat exchanger and the fan system are installed in the bottom shell.

[0015] The volume of the sound attenuation cavity facing the burner and the heat exchanger is greater than the volume of the sound attenuation cavity facing the fan system, and / or the number of the sound attenuation hole corresponding to the sound attenuation cavity facing the burner and the heat exchanger is less than the number of the sound attenuation hole corresponding to the sound attenuation cavity facing the fan system.

[0016] By designing the volume of the sound attenuation cavity facing the burner and the heat exchanger to be larger, low-frequency noise can be better absorbed; by designing the number of the sound attenuation hole corresponding to the sound attenuation cavity facing the fan system to be larger, high-frequency noise can be better absorbed.

[0017] According to one embodiment of the present application, the sound attenuation component comprises a plurality of baffles.

[0018] According to one embodiment of the present application, the second air inlet is arranged at a position away from the air inlet of the burner in the bottom shell.

[0019] According to one embodiment of the present application, the second air inlet is arranged at a position close to the air inlet of the burner in the bottom shell.

[0020] According to one embodiment of the present application, the second air inlet comprises a first group of through holes and a second group of through holes, wherein the first group of through holes is arranged at a position close to the primary air inlet of the burner, and the second group of through holes is arranged at a position close to the secondary air inlet of the burner.

[0021] 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 and the secondary air can be improved, which helps the burner to obtain better combustion effect and reduce the content of harmful gases such as CO in flue gas.

[0022] According to one embodiment of the present application, the flow area of the first group of through holes is A1, and the flow area of the second group of through holes is A2, which satisfies: 1≤A1 / A2≤2.

[0023] By designing the flow area of the first group of through holes to be larger, the proportion of the primary air can be increased, which helps to reduce the emission of harmful gases such as CO and NO

[0024] According to one embodiment of the present application, the bottom shell comprises a back plate, a top plate connected to the upper end of the back plate and bent forward, and a bottom plate connected to the lower end of the back plate and bent forward, the back cover plate is installed on the back of the back plate, and the burner is installed on the front of the back plate.

[0025] The front cover plate comprises a panel and left and right side plates connected to the panel.

[0026] The one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0027] By setting the structure of the bottom shell and the back cover plate cooperating with each other, the bottom shell and the back cover plate can weaken the internal noise, thereby enhancing the sound insulation effect. In addition, the longer and wider air inlet passage is formed by the cavity between the bottom shell and the back cover plate, which can greatly increase the path length of the noise along the air inlet passage to the outside, effectively improve the transmission loss of the noise to the outside, and basically eliminate the intake noise and greatly reduce the flow passage resistance.

[0028] Further, by designing the volume of the sound attenuation cavity towards the burner and the heat exchanger to be larger, low-frequency noise can be better absorbed. By designing the number of sound attenuation holes corresponding to the sound attenuation cavity towards the fan system to be more, high-frequency noise can be better absorbed.

[0029] Further, by independently designing the first and second groups of through holes for the primary and secondary air inlets, the flow ratio of the primary and secondary air can be improved, which helps the burner to obtain better combustion effect and reduce the content of harmful gases such as CO in flue gas.

[0030] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0031] 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.

[0032] Figure 1 is one of the exploded views of the gas water heater provided by the embodiments of the present application;

[0033] Figure 2 is the second exploded view of the gas water heater provided by the embodiments of the present application;

[0034] Figure 3 is one of the air inlet flow direction schematic diagrams of the gas water heater provided by the embodiments of the present application;

[0035] Figure 4 Figure 2 is a schematic diagram of the air inlet flow direction of the gas water heater according to an embodiment of the present application;

[0036] Figure 5 Figure 3 is an exploded view of the gas water heater according to an embodiment of the present application;

[0037] Figure 6 Figure 4 is a schematic diagram of the partial structure of the gas water heater according to an embodiment of the present application;

[0038] Figure 7 Figure 5 is a schematic diagram of the sound attenuation component of the gas water heater according to an embodiment of the present application;

[0039] Figure 8 Figure 6 is a schematic diagram of the sound attenuation component of the gas water heater according to an embodiment of the present application;

[0040] Figure 9 Figure 7 is an exploded view of the partial structure of the gas water heater according to an embodiment of the present application;

[0041] Figure 10 Figure 8 is a schematic diagram of the sound attenuation component of the gas water heater according to an embodiment of the present application;

[0042] Figure 11 Figure 9 is a schematic diagram of the sound attenuation component of the gas water heater according to an embodiment of the present application;

[0043] Figure 12 Figure 10 is a schematic diagram of the sound attenuation component of the gas water heater according to an embodiment of the present application;

[0044] Figure 13 Figure 11 is a schematic diagram of the sound attenuation component of the gas water heater according to an embodiment of the present application.

[0045] Reference signs:

[0046] Bottom shell 100, second air inlet 120;

[0047] Combustor 140, heat exchanger 150, fan system 160, flue 161, sealing ring 172;

[0048] 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;

[0049] Rear cover plate 410, first air inlet 411;

[0050] Front cover plate 420, face plate 421, left side plate 422, right side plate 423. DETAILED DESCRIPTION

[0051] The embodiments of the present application will be further described in details below with reference to 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.

[0052] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "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 used for description purposes and cannot be understood as indicating or implying relative importance.

[0053] 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.

[0054] 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 can only mean 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 can only mean that the horizontal height of the first feature is less than that of the second feature.

[0055] 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 appropriate 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.

[0056] 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.

[0057] 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, a rear cover plate 410 and a front cover plate 420.

[0058] 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 on the front surface of the bottom shell 100, which refers to the side of the front surface.

[0059] The bottom shell 100 can be a shell structure, and in some embodiments, the bottom shell 100 can be an integrated structure to minimize the gap between the bottom shell 100 and the mounting wall behind, 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 Figures 1-5 , the bottom shell 100 can comprise a back plate, a top plate and a bottom plate, the back plate is located at the rear end of the bottom shell 100, the top plate is connected to the upper end of the back plate and the top plate is bent forward, the bottom plate is connected to the lower end of the back plate and the bottom plate is bent forward. The back plate, the top plate and the bottom 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 a fire retardant can be added to the plastic bottom shell 100 to enhance the fireproof performance.

[0062] The burner 140 is mounted on the front surface (front surface) of the bottom shell 100, and the burner 140 can be mounted on the bottom shell 100 by a threaded connection structure or a buckle mounting structure. As shown in Figures 2-5As shown, the burner 140 can be mounted on the front (front surface) of the back panel.

[0063] like Figures 2-5 As shown, the gas water heater may further include a heat exchanger 150, which is installed on the bottom shell 100. The heat exchanger 150 can communicate with the combustion chamber of the burner 140. Oxidant (air) enters the burner 140 through the air inlet, mixes with the gas, and burns in the combustion chamber. The water to be heated and the high-temperature air exchange heat in the heat exchanger 150. The heat exchanger 150 can be located at the upper end of the burner 140. Figures 2-5 As shown, the heat exchanger 150 can be installed on the front (front surface) of the back plate.

[0064] Gas water heaters can be either natural draft or forced draft. Forced draft gas water heaters may also include a fan system 160, which can be as follows: Figures 2-5 As shown, it is installed on the upper end of heat exchanger 150. Figures 2-5 As shown, the heat exchanger 150 can be installed on the front (front surface) of the back plate.

[0065] like Figures 1-4 As shown, the rear cover 410 is mounted on the back of the bottom shell 100. The rear cover 410 can be mounted on the back of the back panel.

[0066] The burner 140, the bottom shell 100, and the rear cover plate 410 are arranged sequentially in the front-to-back direction. The newly added rear cover plate 410 has virtually no impact on the original installation structure of the burner 140 and the bottom shell 100.

[0067] The functional components, bottom shell 100, and rear cover plate 410 are arranged sequentially in the front-to-back direction. The newly added rear cover plate 410 has virtually no impact on the original installation structure of the burner 140 and bottom shell 100. The functional components include the burner 140, heat exchanger 150, and fan system 160.

[0068] In this way, when the operating noise of the gas water heater is transmitted backward, it needs to pass through at least the bottom shell 100 and the rear cover plate 410. The second cover plate and the first cover plate can reflect most of the operating noise that is directly transmitted outward, and the second cover plate and the first cover plate can block the direct path of the noise.

[0069] The rear cover 410 and the bottom shell 100 define an air intake duct. The main body of the rear cover 410 and the back plate of the bottom shell 100 are spaced apart to form an air intake duct.

[0070] The rear cover plate 410 is provided with a first air inlet 411, which is connected to the air intake channel. The first air inlet 411 can be a through hole opened on the rear cover plate 410, which penetrates the rear cover plate 410.

[0071] like Figures 1-4As shown, the first air inlet 411 can include a plurality of through holes formed in the first cover plate, and the shape of the through holes can be various, including but not limited to: long strip, parallelogram, triangle, circle and other polygons, etc.

[0072] The plurality of through holes of the first air inlet 411 can be symmetrically arranged along the central axis of the air inlet channel, so that the air inlet is balanced, and the smoothness of the airflow in the air inlet channel can be improved. For example, as shown in Figures 1-4 As shown in the embodiment, the first air inlet 411 includes three long strip-shaped through holes in the middle and a plurality of long strip-shaped through holes symmetrically distributed on both sides of the three long strip-shaped through holes.

[0073] As shown in Figure 1 , Figure 3 and Figure 4 , the bottom shell 100 is provided with a second air inlet 120, and the second air inlet 120 communicates the air inlet of the burner 140 and the air inlet channel. The second air inlet 120 is located at the position of the bottom shell 100 away from the first air inlet 411.

[0074] For example, as shown in Figures 1-3 , when the first air inlet 411 is located at the lower part of the rear cover plate 410, the second air inlet 120 is arranged at the upper part of the bottom shell 100; correspondingly, when the burner 140 is installed at the lower part of the bottom shell 100, the air inlet channel is a long channel as shown by the arrow.

[0075] As shown in Figure 4 , when the first air inlet 411 is located at the upper part of the rear cover plate 410, the second air inlet 120 is arranged at the lower part of the bottom shell 100. In this way, the length of the air inlet channel is long enough, and the distance between the second air inlet 120 and the air inlet of the burner 140 is short, and the air inlet resistance is small.

[0076] The main function of the air inlet channel 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. 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 through the structural design of the cooperation of the bottom shell 100 and the rear cover plate 410, and the increase is greater than 500%, which effectively improves the transmission loss of the noise transmission outward.

[0077] In related technologies, some structures are also designed to extend the air inlet channel, but all are through a pipeline structure. 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 inlet noise.

[0078] The gas water heater of the embodiment of the present application forms an air inlet channel between the bottom shell 100 and the rear cover plate 410 through the structural design of the cooperation of the bottom shell 100 and the rear cover plate 410, the width of the air inlet channel is equivalent to the width of the whole machine, the flow area of the air inlet channel can be increased, the air inlet channel is linear, the flow channel 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 generated is small, the air inlet noise can be basically eliminated, the air inlet pressure is basically not lost, and the combustion efficiency of the burner 140 is not affected.

[0079] The front cover plate 420 is installed on the front of the bottom shell 100, and the burner 140 is located between the front cover plate 420 and the bottom shell 100. The front cover plate 420 is used for reflecting the noise propagating forward.

[0080] The front cover plate 420 can be a shell structure, in some embodiments, the front cover plate 420 can be an integrated structure to minimize the porosity of the front cover plate 420, or the front cover plate 420 can be an integrated non-porous structure. In this way, the radiation noise of the front of the gas water heater can be reduced.

[0081] As shown in Figure 5 The front cover plate 420 includes a panel 421 and left and right side plates 422 and 423 connected to the panel 421. The panel 421, the left side plate 422 and the right side plate 423 are formed in an integrated structure. In this way, there is no porosity between the plates, and the noise transmitted backward can be reduced.

[0082] The rear cover plate 410 and the front cover plate 420 can be sheet metal structures, so that the fireproof performance and protection performance of the rear cover plate 410 and the front cover plate 420 are relatively strong; or the rear cover plate 410 and the front cover plate 420 can be plastic shell structures, so that the rear cover plate 410 and the front cover plate 420 are light in weight and easy to form, and a fire retardant can be added to the plastic rear cover plate 410 and the plastic front cover plate 420 to enhance the fireproof performance.

[0083] According to the gas water heater of the embodiment of the present application, the bottom shell 100 and the rear cover plate 410 are cooperated to weaken the internal noise, the sound insulation effect is enhanced, a long and wide air inlet channel is formed in the cavity between the bottom shell 100 and the rear cover plate 410, the path length of the noise propagating outward along the air inlet channel is 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 is greatly reduced.

[0084] In some embodiments, the flow area of the first air inlet 411 is P1, the flow area of the second air inlet 120 is P2, and 1.5≤P2 / P1≤3 is satisfied.

[0085] It is understandable that designing the internal second air inlet 120 to have a larger flow cross-sectional area than the external first air inlet 411 can eliminate the flow resistance caused by the air intake, further reduce turbulent noise within the air intake, and prevent whistling at the second air inlet 120. For example, in some embodiments, P2 / P1=2, or P2 / P1=2.5.

[0086] In practical design, the flow cross-sectional area of ​​the first air inlet 411 can be adjusted according to the maximum load of the gas water heater. The greater the maximum load of the gas water heater, the larger the flow cross-sectional area of ​​the first air inlet 411 should be to ensure that the gas in the burner 140 can be fully combusted. The maximum load of the gas water heater can be 25kW, 30kW, or 34kW, etc., and the flow cross-sectional area P1 of the first air inlet 411 can be between 2000mm². 2 ~3500mm 2 Between, for example, P1=2500mm 2 .

[0087] In some embodiments, the second air inlet 120 is located on the bottom shell 100 at a position away from the air inlet of the burner 140.

[0088] like Figure 3 As shown, the burner 140 is installed at the lower part of the bottom shell 100, the second air inlet 120 is located at the upper part of the bottom shell 100, and the first air inlet 411 is located at the lower part of the rear cover plate 410; the air in the gas water heater basically passes through two long straight channels from top to bottom, which can effectively improve the transmission loss of noise.

[0089] In other embodiments, the second air inlet 120 is located on the bottom shell 100 near the air inlet of the burner 140.

[0090] like Figure 4 As shown, the burner 140 is installed at the lower part of the bottom shell 100, the second air inlet 120 is located at the lower part of the bottom shell 100, and the first air inlet 411 is located at the upper part of the rear cover plate 410. The air in the gas water heater basically passes through a long straight channel, which can effectively reduce the transmission loss of noise. In addition, the distance between the second air inlet 120 and the air inlet of the burner 140 is short, resulting in low air intake resistance.

[0091] When the second air inlet 120 is located on the bottom shell 100 near the air inlet of the burner 140, the second air inlet 120 includes a first through hole group and a second through hole group. The first through hole group is located near the primary air inlet of the burner 140, and the second through hole group is located near the secondary air inlet of the burner 140.

[0092] It can be understood that the burner 140 includes a primary air inlet and a secondary air inlet, the primary air inlet is communicated with the gas inlet channel of the burner 140, and the secondary air inlet directly introduces air, and by independently designing the first and second groups of through holes for air inlet for the primary air inlet and the secondary air inlet, the flow ratio of the primary air and the secondary air can be improved, and the burner 140 can obtain better combustion effect and reduce the content of harmful gases such as CO in flue gas.

[0093] For example, the primary air inlet of the burner 140 is on the right side, and the secondary air inlet is at the bottom, and correspondingly, the first group of through holes is located on the right side, and the second group of through holes is located on the left side, and the length of the first group of through holes is longer and extends upward more to adapt to the primary air inlet.

[0094] The shape of the through holes in the first and second groups of through holes can be various, for example, the first and second groups of through holes can each include a plurality of long strip-shaped through holes, and the length of each through hole in the first group of through holes is longer than the length of each through hole in the second group of through holes; or, the first and second groups of through holes can each include a plurality of circular through holes, and the radius of each through hole in the first group of through holes is larger than the radius of each through hole in the second group of through holes.

[0095] Of course, the first and second groups of through holes can also be designed in other shapes, such as polygons, etc.

[0096] In some embodiments, 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, and 1≤A1 / A2≤2 is satisfied. By designing the flow passage cross-sectional area of the first group of through holes to be larger, the proportion of primary air intake can be increased, which is helpful to reduce the emission of harmful gases such as CO and NO, and in actual design, the value of A1 / A2 can be adjusted according to the specific combustion condition, such as A1 / A2=1.5, or A1 / A2=1.8, etc.

[0097] As shown in FIGS. 1, 2 and 3, the gas water heater can further include a fan system 160, and the fan system 160 can include a fan 161 and a fan motor 162. Figure 1 and Figure 2 As shown in FIGS. 1, 2 and 3, the gas water heater can further include a fan system 160, and the fan system 160 can include a fan 161 and a fan motor 162.

[0098] The sealing ring 172 can include two sub-segments with different outer diameters, so that a stepped surface is formed on the outside of the sealing ring 172, and when installed, 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 on the top plate of the bottom shell 100, so that a sealing structure combined with multiple surfaces can be formed, and the sound insulation effect is better.

[0099] The sealing ring 172 can be made of silica gel. The sealing ring 172 made of silica gel is resistant to high temperature, and can prolong the aging time of the sealing ring 172 in a high-temperature environment at the smoke pipe 161.

[0100] The gas water heater can further include other sound-absorbing components 200. Figure 6 As shown in the figure, the sound-absorbing components 200 can be installed on the inner side of the front cover plate 420, i.e., the rear surface of the front cover plate 420.

[0101] The front cover plate 420 itself can reflect most of the working noise directly transmitted outward. In combination with the sound-absorbing components 200 arranged on the inner side of the front cover plate 420, most of the noise is absorbed by the sound-absorbing components 200, and the remaining small amount of noise is reflected by the front cover plate 420, so that the sound-absorbing effect is better.

[0102] The sound-absorbing components 200 can be installed on the front cover plate 420 in various ways, including adhesion, clamping, or threaded connection, etc.

[0103] The sound-absorbing components 200 can have various structural forms. The embodiments of the present application will be described in detail from four different structural forms respectively.

[0104] I. The sound-absorbing components 200 are sound-absorbing cotton

[0105] In this embodiment, sound-absorbing cotton is arranged on the inner side of the front cover plate 420, and the sound-absorbing cotton can be adhered to the inner side of the front cover plate 420.

[0106] The sound-absorbing cotton can include a plurality of regions with different parameters, and the plurality of regions are distributed along a direction perpendicular to the front-rear direction. The parameters include at least one of bulk density and 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.

[0107] The sound-absorbing components 200 include 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 components 200 are different in at least two regions.

[0108] 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, etc. 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.

[0109] By arranging a plurality of regions with different sound-absorbing parameters, various noises can be targetedly eliminated.

[0110] For example, the sound-absorbing cotton may include a first region and a second region. The first region faces the burner 140 and the heat exchanger 150. Preferably, the first region faces the combustion chamber of the burner 140 and the heat exchanger 150. The second region faces the fan system 160. Here, A facing B means that the projections of A and B in the front-back direction are basically coincident.

[0111] The density of the first region is greater than that of the second region, or the thickness of the first region is greater than that of the second region.

[0112] II. The silencing component 200 has a porous silencing cavity structure.

[0113] In this embodiment, the noise reduction component 200 has a noise reduction cavity 220, and the noise reduction cavity 220 has a noise reduction hole 230 on the wall facing the bottom shell 100.

[0114] like Figures 7-8 As shown, the noise reduction component 200 includes a base 210, which can be made of materials such as plastic, metal, or ceramic.

[0115] The base 210 has a sound-absorbing cavity 220, which can be cuboid, spherical or other shapes. The area of ​​the base 210 without the sound-absorbing cavity 220 can be a thin-walled structure to reduce the weight of the sound-absorbing component 200.

[0116] The base 210 has a sound-absorbing hole 230 on the surface (rear surface) facing the bottom shell 100, and the sound-absorbing hole 230 is connected to the sound-absorbing cavity 220.

[0117] When the gas water heater is working, most of the noise will be transmitted to the silencing cavity 220 through the silencing hole 230. Through multiple reflections in the silencing cavity 220, it can be absorbed. A small portion of the noise will be reflected by the front cover plate 420, resulting in a better overall noise reduction effect.

[0118] like Figure 8 As shown, there are multiple silencing cavities 220, which are arranged in an array. Each silencing cavity 220 corresponds to multiple silencing holes 230 arranged in an array.

[0119] In this way, noise from each area can be absorbed through the silencing holes 230 and the silencing cavity 220.

[0120] In some embodiments, at least one of the following is different: the volume of at least two silencing cavities 220, the flow cross-sectional area of ​​the silencing holes 230 corresponding to at least two silencing cavities 220, and the density of the silencing holes 230 corresponding to at least two silencing cavities 220.

[0121] In other words, at least one of the following three parameters of the at least two sound attenuation cavities 220 is different: the volume of the sound attenuation cavity 220, the flow passage cross-sectional area of the sound attenuation hole 230, and the density of the sound attenuation hole 230 corresponding to the sound attenuation cavity 220, so that the sound attenuation can be targeted for different frequency characteristics of the combustion noise, water flow noise, and flow-induced noise of the gas water heater.

[0122] In some embodiments, as shown in FIG. 1, the volume of the sound attenuation cavity 220 towards the burner 140 and the heat exchanger 150 is greater than the volume of the sound attenuation cavity 220 towards the fan system 160. Figure 9

[0123] 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, and the fan and water pump noise has obvious high-frequency characteristics and is sharp and piercing, with poor auditory perception.

[0124] By designing the volume of the sound attenuation cavity 220 towards the burner 140 and the heat exchanger 150 to be larger, the low-frequency noise can be better absorbed.

[0125] In some embodiments, the number of sound attenuation holes 230 corresponding to the sound attenuation cavity 220 towards the burner 140 and the heat exchanger 150 is less than the number of sound attenuation holes 230 corresponding to the sound attenuation cavity 220 towards the fan system 160. By designing the number of sound attenuation holes 230 corresponding to the sound attenuation cavity 220 towards the fan system 160 to be larger, the high-frequency noise can be better absorbed.

[0126] In one embodiment, as shown in FIG. 1, the base body 210 can include a first region 221 and a second region 222, the first region 221 is towards the burner 140 and the heat exchanger 150, preferably, the first region 221 is towards the combustion chamber of the burner 140 and the heat exchanger 150; the second region 222 is towards the fan system 160, where A is towards B means that A and B project substantially coincide in the front-back direction. Figure 9 The volume of the sound attenuation cavity 220 corresponding to the first region 221 is V1, the hole diameter of the sound attenuation hole 230 corresponding to the first region 221 is D1, and the number of sound attenuation holes 230 corresponding to each sound attenuation cavity 220 of the first region 221 is N1, which satisfies: 60mm 3 ≤V1≤455mm 3 , 0.6mm≤D1≤2mm, 50≤N1≤75; for example, V1=200mm 3 , D1=1mm, N1=66. This form of the first region 221 can better absorb noise with a frequency of about 300Hz.

[0127]

[0128] ​​The volume of the sound attenuation cavity 220 corresponding to the second region 222 is V2, the hole diameter of the sound attenuation hole 230 corresponding to the second region 222 is D2, and the number of the sound attenuation holes 230 corresponding to each sound attenuation cavity 220 corresponding to the second region 222 is N2, and the following conditions are satisfied: 10mm 3 ≤V2≤80mm 3 , 0.6mm≤D2≤2mm, 76≤N2≤120; for example, V1=50mm 3 , D1=1.2mm, N1=99. The second region 222 in this form can well attenuate noise with a frequency of about 600Hz-800Hz.

[0129] III. The sound attenuation component 200 is a labyrinthine sound attenuator

[0130] In this embodiment, as shown in Figures 10-13 , the sound attenuation component 200 includes a plurality of baffles 240.

[0131] The plurality of baffles 240 can form a labyrinthine structure, so that the noise is reflected multiple times in the labyrinthine flow channel, consumes the energy of the noise, and achieves the purpose of reducing the noise, which can greatly weaken the noise that propagates outward through the air intake.

[0132] The normal line of at least a portion of the baffle 240 and the up-down direction forms an angle less than 30°, and the plurality of baffles 240 are spaced apart. In this way, most of the noise can be reflected multiple times, consume the energy of the noise, and achieve the purpose of reducing the noise.

[0133] As shown in Figures 10-12 , the baffle 240 can be arc-shaped, and the baffle 240 is curved away from the second air inlet 120. In this way, the noise reflected by the baffle 240 is basically far away from the second air inlet 120, and needs to be reflected more times to enter the air intake through the second air inlet 120, reducing the energy of the noise entering the air intake.

[0134] As shown in Figures 10-12 , the number and distribution of the baffles 240 can have various forms. As shown in Figure 10 , the length of the baffle 240 is short, the number of the baffle 240 is large, and the left and right sides are symmetrically arranged; as shown in Figure 11 , the length of the baffle 240 is long, the number of the baffle 240 is small, and the left and right sides are symmetrically arranged; as shown in Figure 12 , the length of the baffle 240 is long, the number of the baffle 240 is small, and the left and right sides are asymmetrically arranged.

[0135] Of course, the baffle 240 can be a flat plate, as shown in Figure 13 , the baffle 240 is a flat plate, and the plurality of baffles 240 are spaced apart for air flow.

[0136] The flat plate-shaped baffle 240 and the arc-shaped baffle 240 can also be mixed.

[0137] In Figures 10-13 In the embodiment shown, the sound-damping component 200 comprises a support plate 250, the baffle plates 240 are mounted on the support plate 250, and the support plate 250 is connected with the front cover plate 420, for example, the support plate 250 can be attached to the inner side of the front cover plate 420.

[0138] Four, the sound-damping component 200 is a combination of the above-mentioned various structures

[0139] For example, a combination of sound-absorbing cotton and a porous sound-damping 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 Hz to 1000 Hz can be better absorbed, and the porous sound-damping 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.

[0140] Other combination forms will not be described one by one here.

[0141] 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.

[0142] 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, characterized in that, include: Bottom shell; A burner, the burner being mounted on the front of the bottom shell; The rear cover plate is installed on the back of the bottom shell and defines an air intake passage with the bottom shell. The rear cover plate is provided with a first air inlet that communicates with the air intake passage. The bottom shell is provided with a second air inlet at a position away from the first air inlet. The second air inlet communicates with the air inlet of the burner and the air intake passage. A front cover plate is mounted on the front of the bottom shell, and the burner is located between the front cover plate and the bottom shell; The width of the air intake duct is approximately equal to the overall width of the gas water heater; The flow cross-sectional area of ​​the first air inlet is P1, and the flow cross-sectional area of ​​the second air inlet is P2, satisfying: 1.5≤P2 / P1≤3; The second air inlet is located on the bottom shell at a position away from or close to the air inlet of the burner; When the second air inlet is located on the bottom shell near the burner's air inlet, The second air inlet includes a first through hole group and a second through hole group. The first through hole group is located near the primary air inlet of the burner, and the second through hole group is located near the secondary air inlet of the burner. The flow cross-sectional area of ​​the first through-hole group is A1, and the flow cross-sectional area of ​​the second through-hole group is A2, satisfying: 1≤A1 / A2≤2.

2. The gas water heater according to claim 1, characterized in that, The inner side of the front cover is provided with a sound-absorbing component.

3. The gas water heater according to claim 2, characterized in that, The noise-absorbing component has a noise-absorbing cavity, and the noise-absorbing cavity has noise-absorbing holes on the wall surface facing the bottom shell.

4. The gas water heater according to claim 3, characterized in that, The silencing chambers are multiple, and the multiple silencing chambers are arranged in an array. Each silencing chamber corresponds to multiple silencing holes arranged in an array.

5. The gas water heater according to claim 4, characterized in that, At least one of the following is different: the volume of at least two of the silencing cavities, the flow cross-sectional area of ​​the silencing holes corresponding to at least two of the silencing cavities, and the density of the silencing holes corresponding to at least two of the silencing cavities.

6. The gas water heater according to claim 5, characterized in that, Also includes: A heat exchanger and a fan system, both of which are mounted on the bottom shell; The volume of the silencing cavity facing the burner and the heat exchanger is greater than the volume of the silencing cavity facing the fan system, and / or the number of silencing holes corresponding to the silencing cavity facing the burner and the heat exchanger is less than the number of silencing holes corresponding to the silencing cavity facing the fan system.

7. The gas water heater according to claim 2, characterized in that, The noise reduction component includes multiple baffles.

8. The gas water heater according to any one of claims 1-7, characterized in that, The bottom shell includes a back plate, a top plate connected to the upper end of the back plate and bent forward, and a bottom plate connected to the lower end of the back plate and bent forward. The rear cover plate is installed on the back of the back plate, and the burner is installed on the front of the back plate. The front cover includes a front panel and a left side panel and a right side panel connected to the front panel.

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