A water heater sound attenuation passage and a water heater

Abstract

The utility model discloses a water heater sound elimination passage and water heater, the water heater sound elimination passage includes: air inlet channel has air inlet and air outlet, and sound elimination part is arranged in air inlet channel, sound elimination part is water drop state, and the bottom of water drop state is towards the air current of air inlet.

Description

Technical Field

[0001] This utility model relates to household appliances, and in particular to a sound-absorbing channel for a water heater, and a water heater using the sound-absorbing channel. Background Technology

[0002] Currently, most gas water heaters use a blower-type air intake method, which means that a fan is installed on the bottom side of the combustion chamber to provide the air required for combustion.

[0003] The fan is one of the main noise sources in a gas water heater, and its air inlet is the primary source of noise radiation. Because the fan inlet faces the back panel, noise leaks along the back panel through the air inlet, resulting in significant sound leakage. Consequently, the gas water heater causes noise interference during continuous combustion. The noise from the zero-cold-water function is particularly noticeable, especially when the water heater suddenly starts during sleep or nap time, causing severe disturbance. A common solution is to install a sheet metal panel on the back, but its sound insulation is far from sufficient, and noise still escapes through the air inlet at the back of the water heater.

[0004] Chinese Patent Application No. 202210459508.2 discloses a gas water heater, which includes: a bottom shell with an opening; a burner installed on the bottom shell; and a cover assembly installed on the bottom shell and covering the opening. The cover assembly includes a first cover plate and a second cover plate, with the second cover plate located between the burner and the first cover plate. The cover assembly has an air inlet located between the first cover plate and the second cover plate. The first cover plate has a first air inlet communicating with the air inlet, and the second cover plate has a second air inlet located away from the first air inlet. The second air inlet communicates with the air inlet of the burner. A silencing component is provided in the air inlet, and the silencing component is installed on at least one of the first cover plate and the second cover plate. The silencing component is sound-absorbing cotton or a porous silencing cavity structure.

[0005] The sound-absorbing components in the air intake of this type of water heater can reduce noise, but they also increase fluid resistance and affect normal air intake. Utility Model Content

[0006] The first technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a sound-absorbing channel for a water heater, reducing noise at the air inlet while ensuring that the flow resistance does not change significantly.

[0007] The second technical problem to be solved by this utility model is to provide a water heater that uses the above-mentioned water heater silencing channel.

[0008] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a sound-absorbing channel for a water heater, comprising:

[0009] The air intake channel has an air inlet and an air outlet; and

[0010] The noise reduction component is located inside the air intake passage;

[0011] Its features are:

[0012] The silencing component is teardrop-shaped, with the bottom of the teardrop facing the airflow entering through the air inlet.

[0013] By incorporating teardrop-shaped noise-reducing components, noise emanating from the air outlet can be reduced. Furthermore, the teardrop shape of the noise-reducing components reduces fluid resistance as the airflow flows from the inlet to the outlet, preventing excessive resistance to the fluid caused by the noise-reducing components.

[0014] Preferably, the outline of the noise-reducing component includes a first curve, a second curve, and a third curve. The first curve corresponds to the tip of the water droplet, the second curve corresponds to the bottom of the water droplet, and the third curve has two opposite curves. Each third curve is directly or indirectly connected between the corresponding ends of the first curve and the second curve.

[0015] Preferably, the radius of curvature of the first curve is R1, and satisfies 0.2≤R1 / W≤0.5, where W is the width of the silencing component. This improves flow adhesion, allows the rounded corners to guide a smooth fluid transition, delays the separation point, and reduces eddy size; optimizes the pressure gradient, resulting in a more uniform distribution of the high-pressure zone at the leading edge, more sufficient pressure recovery at the tail, and reduced pressure drag.

[0016] Preferably, the radius of curvature of the second curve is R2, and satisfies 0.2≤R2 / W≤0.4, where W is the width of the silencer component. This improves flow adhesion: rounded corners guide a smooth airflow transition, delaying the separation point and reducing wake size; pressure gradient optimization allows the airflow to flow more stably along the surface, reducing pressure drag.

[0017] Preferably, the radius of curvature of the third curve is R3, and satisfies 0.2≤R3 / W≤0.4, where W is the width of the silencing component. This improves flow adhesion: rounded corners guide a smooth airflow transition, reducing lateral separation and minimizing three-dimensional turbulence effects; pressure gradient optimization: airflow can circulate more uniformly, reducing local high / low pressure zones and lowering pressure drag.

[0018] Preferably, each third curve is connected to any endpoint of the first curve by a first straight line, and the angle between the two first straight lines is θ1, satisfying 30°≤θ1≤60°. This improves flow adhesion: the airflow flows more smoothly along the slope, delaying the separation point and reducing the wake size; and achieves optimal drag balance: pressure drag is significantly reduced while avoiding excessive increase in frictional drag.

[0019] Preferably, each third curve is connected to any endpoint of the second curve by a second straight line, and the angle between the two second straight lines is θ2, satisfying 30°≤θ2≤60°. This allows the airflow to flow more smoothly along the slope, delaying separation and significantly reducing the wake region; the drag balance is optimal: pressure drag is greatly reduced while avoiding excessive increase in frictional drag.

[0020] Furthermore, the silencing components are multiple and arranged in at least two columns, with a spacing of L1 between two adjacent columns of silencing components, and satisfying 0.8L≤L1≤L, where L is the length of the silencing component.

[0021] If L1 > L, the sound will escape through the gaps between the sound-absorbing components, thus failing to reduce noise. If L1 is less than 0.8L, the airflow resistance will increase, affecting the air intake of the water heater.

[0022] Furthermore, the silencing components are multiple and arranged in at least two rows, with a spacing of L2 between two adjacent rows of silencing components, and satisfying 0.4W≤L2≤0.6W, where W is the width of the silencing component.

[0023] If L2 < 0.4W, the distance between the two rows of silencers will be too small and too dense, which will affect the airflow. If L2 > 0.6W, the distance between the two rows of silencers will be too large and too sparse, which will affect the noise reduction effect.

[0024] Preferably, the length of the silencing component is L and the width is W, and the condition 1 ≤ L / W ≤ 3 is met. When the aspect ratio of the water droplet is within the above range, the water droplet tends to be streamlined, the proportion of surface friction resistance increases, but the pressure drag decreases significantly, the boundary layer flow is more stable, the wake region shrinks, and the eddies weaken.

[0025] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a water heater, characterized in that: it applies the water heater silencing channel as described above.

[0026] Furthermore, to facilitate the formation of an air intake passage, the water heater includes a bottom shell housing a burner and a fan, the bottom shell having an opening, and the water heater also includes a cover plate covering the opening and a back plate disposed on the back side of the cover plate away from the bottom shell, the air intake passage being formed between the cover plate and the back plate.

[0027] Preferably, the back plate includes a back plate body and a flange formed around the periphery of the back plate body. The flange fits into the cover plate, while the back plate body is spaced apart from the cover plate, thereby forming the air intake channel between the cover plate and the back plate. The outline of the muffler is the outline of the muffler projected onto the cover plate or the back plate.

[0028] Preferably, the air inlet is formed on the back plate and the air outlet is formed on the cover plate.

[0029] Furthermore, the air inlet is located near the bottom of the flange, and the air outlet is located near the top of the cover plate, thereby maximizing the path for the fan noise to propagate outward and reducing noise leakage.

[0030] Compared with the prior art, the advantages of this utility model are: by setting a teardrop-shaped silencing component, the noise coming out from the air outlet can be reduced. At the same time, since the silencing component is teardrop-shaped, when the airflow enters from the air inlet and flows to the air outlet, its streamlined shape can reduce fluid resistance and avoid the silencing component causing great resistance to the fluid. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a water heater according to an embodiment of the present utility model;

[0032] Figure 2 This is an exploded view of the water heater according to an embodiment of the present utility model;

[0033] Figure 3 This is a cross-sectional view of a water heater according to an embodiment of the present utility model;

[0034] Figure 4 This is a rear view of the concealed back panel of the water heater according to an embodiment of the present utility model.

[0035] Figure 5 This is a schematic diagram of the sound-absorbing cotton in a water heater according to an embodiment of the present utility model;

[0036] Figure 6 This is a flow field simulation diagram of the air intake channel of the water heater according to an embodiment of the present invention. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0039] See Figures 1-5 A water heater, specifically a gas water heater, includes a bottom shell 1, a cover plate 2, and a back plate 3.

[0040] The bottom shell 1 is roughly rectangular, with one side (the rear side against the wall in the installed state) being open. The burner, fan, etc. (not shown) are installed inside the bottom shell 1.

[0041] A cover plate 2 is installed on the open side of the bottom shell 1, while a back plate 3 is installed on the back side of the cover plate 2 away from the bottom shell 1. The back plate 3 includes a back plate body 31 and flanges 32 formed around the periphery of the back plate body 31. The cover plate 2 and the back plate body 31 are generally rectangular and adapted to fit the bottom shell 1, with flanges 32 formed around the periphery of the back plate body 31. The flanges 32 are fitted to the cover plate 2, while the back plate body 31 is spaced apart from the cover plate 2. Thus, the flanges 32 create an air intake passage Q between the cover plate 2 and the back plate 3.

[0042] An air inlet 33 is formed on the back plate 3, allowing the water heater to be fluidly connected to the air intake channel Q through the air inlet 33. An air outlet 21 is formed on the cover plate 2, allowing the air intake channel Q to be fluidly connected to the interior of the bottom shell 1. The air outlet 21 serves as the air inlet for the bottom shell 1. Thus, external air can enter the air intake channel Q through the air inlet 33 and enter the bottom shell 1 through the air outlet 21. Fan noise is transmitted from the air outlet 21 into the air intake channel Q.

[0043] The structure of the bottom shell 1, cover plate 2 and back plate 3 is the same as that of the prior art.

[0044] The air inlet 33 can be located on the back panel body 31 or on the flange 32. In this embodiment, the air inlet 33 is located on the flange 32 and at the lower part of the flange 32, preferably near the bottom of the flange 32. The air outlet 21 is located at the upper part of the cover plate 2, preferably near the top of the cover plate 2.

[0045] A silencer component 4 is installed inside the air intake channel Q. It can be fixed to the cover plate 2 or the back plate body 31. The opposite sides of the silencer component 4 can respectively fit against the cover plate 2 and the back plate body 31. The silencer component 4 can be a sound-absorbing material or a porous sound-absorbing structure. Sound-absorbing materials include commonly used sound-absorbing cotton, and porous sound-absorbing structures include commonly used perforated plates. The silencer component 4 is teardrop-shaped, with its head facing upwards and its bottom facing downwards. The length of the silencer component 4 is L, and its width is W. The length direction of the silencer component 4 is consistent with the airflow direction (from bottom to top), while the width direction is perpendicular to the length direction. Figure 4 The diagram shows the left-right direction, and satisfies 1≤L / W≤3, more preferably 1.5≤L / W≤2.5. The aspect ratio of the teardrop shape has a certain influence on flow resistance. When L / W<1, it is a flat teardrop, and the resistance is mainly pressure difference resistance. Figure 4 The image shows the top tip) high-pressure zone and the tail ( Figure 4 The diagram shows a low-pressure region (the flat bottom section) where a significant pressure difference forms, leading to high flow resistance. Frequent vortex shedding at the tail results in significant energy dissipation. When L / W = 1–3, the droplets tend to streamline, increasing the proportion of surface friction drag, but significantly reducing pressure drag. The boundary layer flow is more stable, the wake region shrinks, and the vortex weakens. When L / W > 3, the droplets are elongated, where surface friction drag dominates. Due to the increased wetted surface area, frictional energy dissipation increases. Excessive elongation may cause the flow separation point to shift forward, thus increasing pressure drag. When L / W = 1.5–2.5, the droplet flow resistance is usually the lowest. Within this aspect ratio range, pressure drag and friction drag are balanced, allowing the fluid to smoothly bypass the droplet, delaying flow separation, resulting in the weakest wake turbulence, better pressure distribution symmetry, minimal pressure difference, and lowest energy loss. In summary, the droplet is at its optimal aspect ratio at this point, offering the following advantages: 1. Enhanced flow adhesion: The fluid flows stably along the droplet surface, with the separation point closer to the tail; 2. Reduced wake region: The eddy size is reduced, pressure recovery is more complete, and kinetic energy loss is reduced; 3. Minimized drag coefficient: Compared to flat or elongated shapes, the total drag can be reduced by 30%–50% (the specific value depends on the Reynolds number).

[0046] The outline of the projection of the silencing component 4 onto the cover plate 2 or the back plate body 31 (normally, in the installed state, the cover plate 2 and the back plate body 31 extend vertically) is shown in the figure. Figure 5The contour line includes a first curve 41, a second curve 42, and a third curve 43. The first curve 41 convexes upwards (in the direction of airflow), and the second curve 42 convexes downwards (facing the airflow). Each endpoint of the first curve 41 is connected by a first straight line 44, and each third curve 43 is connected to any endpoint of the second curve 42 by a second straight line 45. The two endpoints of each first straight line 44 are A and B, and the two endpoints of each second straight line 45 are C and D. Adjacent curves and adjacent curves and straight lines have smooth transitions. Alternatively, the third curve 43 and the first curve 41, and the third curve 43 and the second curve 42, can be directly connected. The radius of curvature of the first curve 41 is R1, the radius of curvature of the second curve 42 is R2, and the radius of curvature of the third curve 43 is R3. The distance between the vertices of the first curve 41 and the second curve 42 is the aforementioned length L, and the distance between the vertices of the third curve 43 is the aforementioned width W.

[0047] R1 represents the radius of curvature of the droplet tip, describing the degree of curvature at the top of the droplet. A smaller radius of curvature indicates a sharper tip, while a larger radius of curvature indicates a smoother tip. R1 and W satisfy the following relationship: 0.2 ≤ R1 / W ≤ 0.5, and more preferably, 0.3 ≤ R1 / W ≤ 0.4. R1 / W represents the ratio of the radius of curvature R of the top fillet to the width W of the droplet, used to dimensionlessly calculate the fillet size. When R1 / W < 0.2, flow separation occurs early: the fluid makes a sharp turn at the top edge, the boundary layer easily separates, forming a large vortex region, significantly increasing pressure drag and causing high energy dissipation: the separation vortex leads to instability in the wake and large kinetic energy loss. When 0.2 ≤ R1 / W ≤ 0.5, flow adhesion improves, the fillet guides the fluid to a smooth transition, delays the separation point, reduces vortex size, optimizes the pressure gradient, the high-pressure region at the leading edge is more uniformly distributed, the pressure recovery at the tail is more sufficient, and the pressure drag is reduced. When R / W > 0.5, frictional resistance increases: the wetted surface area increases significantly, the proportion of surface shear force rises, and the potential separation point shifts backward. Although the pressure difference drag is small, excessively large fillets may lead to "over-adhesion" of the flow, which in turn increases frictional energy consumption. When 0.3 ≤ R1 / W ≤ 0.4, the top fillet is in the optimal range, with the following effects: 1. No significant flow separation: the fluid flows closely to the surface of the water droplet, and the separation point is pushed to the vicinity of the tail; 2. The low-pressure area shrinks: the intensity of the wake vortex is weakened, and the symmetry of the pressure distribution is improved; 3. The drag coefficient decreases: compared with sharp edges or excessively large fillets, the total drag can be reduced by 20% to 40%.

[0048] R2 represents the radius of curvature at the bottom of the water droplet, describing the degree of curvature at the bottom of the droplet. A larger radius of curvature makes the bottom of the droplet more rounded, while a smaller radius of curvature makes the bottom appear flatter. R2 and W satisfy the following relationship: 0.2≤R2 / W≤0.4, with a more preferred ratio of 0.25≤R2 / W≤0.35. The meaning of the ratio is the same as above. When R2 / W is less than 0.2, flow separation occurs early: the airflow suddenly separates at the sharp edge, forming a large-scale turbulent wake region with high pressure drag. High energy dissipation: the eddy shearing is intense, resulting in large kinetic energy loss, similar to flow around a blunt body. When 0.2≤R2 / W≤0.4, flow adhesion improves: rounded corners guide the airflow to a smooth transition, delaying the separation point and reducing the wake size; pressure gradient optimization: the airflow can flow more stably along the surface, reducing pressure drag. When R / W is greater than 0.4, frictional drag increases: the wetted surface area increases, and the proportion of surface shear force increases. Potential backflow zone: Excessively large fillets may cause the airflow to adhere too long at the tail, triggering secondary separation and increasing turbulent drag. When 0.25 ≤ R² / W ≤ 0.35, this is the optimal range for the bottom fillet curvature radius, which has the following effects: 1. Delayed flow separation: The airflow flows stably along the water droplet surface, and the separation point is closer to the tail, reducing eddy shedding; 2. Reduced wake region: The intensity of turbulent vortex shedding is weakened, pressure recovery is more complete, and pressure drag is reduced; 3. Reduced total drag: Compared to sharp edges or excessively large fillets, the drag coefficient can be reduced by 20% to 40%.

[0049] The lateral radius of curvature R3 is the radius of curvature on both sides of the water droplet, describing the degree of curvature on both sides of the droplet. A larger radius of curvature makes the sides of the droplet fuller, while a smaller radius of curvature makes the sides appear sharper. R3 and W satisfy the following relationship: 0.2≤R3 / W≤0.4, and more preferably 0.25≤R3 / W≤0.35, with the same meaning as above. When R3 / W is less than 0.2, it is close to a sharp edge, and airflow separation occurs early: the airflow separates at the acute angle on the side, forming a three-dimensional vortex structure, increasing pressure drag. Lateral turbulence enhancement: Unstable vortex streets form on the sides of the airflow, leading to additional energy dissipation. When 0.2 ≤ R3 / W ≤ 0.4, flow adhesion improves: rounded corners guide the airflow through a smooth transition, reducing lateral separation and lowering the three-dimensional turbulence effect. Pressure gradient optimization: The airflow can flow more evenly around the droplet, reducing local high / low pressure zones and lowering pressure drag. When R3 / W is much greater than 0.4, it approaches a semi-circle, at which point frictional drag increases: the wetted surface area on the sides increases, and the proportion of surface shear force rises. Excessive flow diffusion: Overly large rounded corners may cause the airflow to diffuse too quickly on the sides, which increases turbulent drag. When 0.25 ≤ R3 / W ≤ 0.35 is satisfied, this is the optimal range for the side curvature radius, with the following effects: 1. More stable three-dimensional flow: The airflow flows smoothly along the side of the droplet, reducing lateral vortex shedding; 2. Reduced pressure drag: The pressure distribution on the sides is more uniform, reducing local high-pressure zones; 3. Reduced total drag: Compared to sharp edges or overly large rounded corners, the drag coefficient can be reduced by 15% to 30%. .

[0050] The included angle at the tip of the water droplet is θ1, which is the angle between the first straight line 44. The smaller the angle, the more slender the tip of the water droplet; the larger the angle, the blunter the tip. This included angle satisfies the following relationship: 30°≤θ1≤60°, with a more preferred 50°≤θ1≤60°. When θ1<30°, the flow is relatively sharp, resulting in early flow separation: the airflow is forced to separate at the sharp edge, forming a large-scale turbulent wake region with extremely high pressure drag. High energy dissipation: the separation vortex oscillates strongly (similar to flow around a blunt body), resulting in significant kinetic energy loss. When 30°≤θ1≤60°, the flow adhesion is improved: the airflow can flow more smoothly along the slope, delaying the separation point and reducing the wake size; optimal drag balance: pressure drag is significantly reduced while avoiding excessive increase in friction drag. When θ1>60°, the flow adhesion is improved: the airflow can flow more smoothly along the slope, delaying the separation point and reducing the wake size. Optimal balance: pressure drag is significantly reduced while avoiding excessive increase in friction drag. When 50°≤θ1≤60° is satisfied, this is the optimal tip angle range, which has the following effects: 1. Delayed flow separation: The airflow flows close to the surface of the water droplet, pushing the separation point to the area near the top; 2. Reduced wake region: The intensity of wake turbulence is reduced, and the pressure recovery is more complete; 3. Lowest drag: Compared with sharp or overly rounded designs, the drag coefficient can be reduced by 25% to 40%.

[0051] The angle at the bottom of the water droplet is θ2, which is the angle between the second straight line and 45°. The bottom angle affects the stability of the water droplet; a smaller angle makes the droplet appear more unstable, while a larger angle makes it more stable. This angle satisfies the following relationship: 30°≤θ2≤60°, with 50°≤θ2≤60° being more preferred. When θ2<30°, the flow separation is severe: the airflow suddenly separates at the sharp edge, forming a large-scale turbulent wake region with extremely high pressure drag. The wake is unstable: strong eddy shedding leads to a large dissipation of kinetic energy. When 30°≤θ2≤60°, the airflow can flow more smoothly along the slope, delaying separation and significantly reducing the wake region. Optimal drag balance is achieved: pressure drag is significantly reduced while avoiding excessive increase in friction drag. When θ2>60°, friction drag increases: the wetted surface area increases, and the proportion of surface shear force increases. Flow "stagnation" effect: the airflow may form a low-speed backflow zone in the lower half, which actually increases turbulent drag. When 50°≤θ2≤60° is satisfied, this is the optimal range of bottom included angle, which has the following effects: 1. Most stable wake: The separation point is close to the bottom end, and the wake turbulence intensity is reduced by 40% to 60%; 2. Sufficient pressure recovery: The tail pressure is closer to the incoming flow pressure, and the pressure difference drag is reduced by 25% to 35%.

[0052] Preferably, there are multiple silencing components 4, which can be arranged in at least two columns in the horizontal direction and / or at least two rows in the vertical direction. Here, "column" refers to an arrangement perpendicular to the airflow direction, i.e., along the width of the silencing component 4, and "row" refers to an arrangement in the same direction as the airflow direction, i.e., along the length of the silencing component 4. In this embodiment, they are arranged in at least two columns in the horizontal direction and at least two rows in the vertical direction. The distance (minimum horizontal distance) between two adjacent silencing components 4 in each row is L1, and satisfies 0.8L ≤ L1 ≤ L. If L1 > L, sound will escape through the gaps between the silencing components 4, failing to achieve noise reduction. If L1 is less than 0.8L, airflow resistance will increase, affecting the air intake of the water heater. The minimum vertical distance between two adjacent rows of silencers 4 is L2, and it satisfies 0.4W≤L2≤0.6W. If L2<0.4W, the distance between the two rows of silencers 4 is too small and too dense, which will affect the airflow. If L2>0.6W, the distance between the two rows of silencers 4 is too large and too sparse, which will affect the noise reduction effect.

[0053] See Figure 6 As can be seen, when the airflow flows from bottom to top, the fluid is not significantly obstructed when the back air intake channel of this invention is present, and can pass through the channel smoothly. The simulation results show that the outlet mass flow rate is reduced by about 12% compared to the original outlet mass flow rate without a back silencer air intake channel, which meets the combustion requirements of the gas water heater.

[0054] The fan speed of the aforementioned water heater can be intelligently controlled by voice. To this end, the water heater can be equipped with an intelligent voice control module, which includes a controller, a voice receiving module, and a voice parsing module. The voice receiving module can receive user commands, and the voice parsing module can parse the commands. Based on the parsed commands, the system can control the water heater to perform corresponding operations, thereby realizing intelligent regulation of the water heater and improving the user experience of this utility model water heater.

[0055] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A sound-absorbing channel for a water heater, comprising: The air intake passage (Q) has an air inlet (33) and an air outlet (21); as well as A muffler (4) is installed inside the air intake passage (Q); Its features are: The silencing component (4) is teardrop-shaped, with the bottom of the teardrop facing the airflow entering through the air inlet (33).

2. The sound-absorbing channel for a water heater according to claim 1, characterized in that: The outline of the noise-reducing component (4) includes a first curve (41), a second curve (42) and a third curve (43). The first curve (41) corresponds to the tip of the water droplet, the second curve (42) corresponds to the bottom of the water droplet, and the third curve (43) has two opposite curves. Each third curve (43) is directly or indirectly connected between the corresponding ends of the first curve (41) and the second curve (42).

3. The sound-absorbing channel for a water heater according to claim 2, characterized in that: The radius of curvature of the first curve (41) is R1, and satisfies 0.2≤R1 / W≤0.5, where W is the width of the silencing component (4).

4. The sound-absorbing channel for a water heater according to claim 2, characterized in that: The radius of curvature of the second curve (42) is R2, and satisfies 0.2≤R2 / W≤0.4, where W is the width of the silencing component (4).

5. The sound-absorbing channel for a water heater according to claim 2, characterized in that: The radius of curvature of the third curve (43) is R3, and satisfies 0.2≤R3 / W≤0.4, where W is the width of the silencing component (4).

6. The sound-absorbing channel for a water heater according to claim 2, characterized in that: Each third curve (43) is connected to any endpoint of the first curve (41) by a first straight line (44), and the angle between the two first straight lines (44) is θ1, which satisfies 30°≤θ1≤60°.

7. The sound-absorbing channel for a water heater according to claim 2, characterized in that: Each third curve (43) is connected to one of the endpoints of the second curve (42) by a second straight line (45), and the angle between the two second straight lines (45) is θ2, satisfying 30°≤θ2≤60°.

8. The sound-absorbing channel of the water heater according to any one of claims 1 to 7, characterized in that: The silencing component (4) has a plurality of components arranged in at least two columns along the width direction of the silencing component (4), the spacing between two adjacent columns of silencing components (4) is L1, and satisfies 0.8L≤L1≤L, where L is the length of the silencing component (4).

9. The sound-absorbing channel of a water heater according to any one of claims 1 to 7, characterized in that: The silencing component (4) has a plurality of components arranged in at least two rows along the length of the silencing component (4), with a spacing of L2 between two adjacent rows of silencing components (4), and satisfying 0.4W≤L2≤0.6W, where W is the width of the silencing component (4).

10. The sound-absorbing channel of a water heater according to any one of claims 1 to 7, characterized in that: The length of the silencing component (4) is L and the width is W, and it satisfies 1≤L / W≤3.

11. A water heater, characterized in that: The application includes a water heater silencing channel as described in any one of claims 1 to 10.

12. The water heater according to claim 11, characterized in that: The water heater includes a bottom shell (1) housing a burner and a fan, the bottom shell (1) having an opening, the water heater also includes a cover plate (2) covering the opening and a back plate (3) disposed on the back side of the cover plate (2) away from the bottom shell (1), and the air intake channel (Q) is formed between the cover plate (2) and the back plate (3).

13. The water heater according to claim 12, characterized in that: The back plate (3) includes a back plate body (31) and a flange (32) formed around the back plate body (31). The flange (32) fits against the cover plate (2), while the back plate body (31) is spaced apart from the cover plate (2), thereby forming the air intake channel (Q) between the cover plate (2) and the back plate (3). The outline of the muffler (4) is the outline of the muffler (4) projected onto the cover plate (2) or the back plate (3).

14. The water heater according to claim 13, characterized in that: The air inlet (33) is formed on the back plate (3), and the air outlet (21) is formed on the cover plate (2).

15. The water heater according to claim 14, characterized in that: The air inlet (33) is near the bottom of the flange (32), and the air outlet (21) is near the top of the cover plate (2).

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