A sound insulation device for a fully premix wall-hung boiler

Abstract

The utility model discloses a kind of noise reduction device of full premix wall-hanging stove, it includes air inlet inner tube, first sound-absorbing cotton cylinder, first sleeve pipe, second sound-absorbing cotton cylinder and second sleeve pipe. Air inlet inner tube is connected fan, first sound-absorbing cotton cylinder, first sleeve pipe, second sound-absorbing cotton cylinder and second sleeve pipe are sequentially sleeved to the outside of air inlet inner tube, multiple rows of inner tube air inlet holes are opened in air inlet inner tube, multiple rows of first sleeve pipe air inlet holes are opened in first sleeve pipe, the bottom end of second sleeve pipe is covered with bottom plate, multiple rows of second sleeve pipe air inlet holes are opened in second sleeve pipe, air inlet inner tube, first sleeve pipe air inlet hole and second sleeve pipe air inlet hole are alternately arranged, it can avoid that hot sound oscillation noise directly and unobstructedly is transmitted from fan, sound wave energy is converted into heat energy when passing through first sound-absorbing cotton cylinder and second sound-absorbing cotton cylinder and its hole wall friction is consumed, and different variable diameter is formed in staggered sound wave propagation channel, sound energy is further consumed by the deformation of medium, the effective noise reduction of wall-hanging stove air inlet structure is realized.

Description

Technical Field

[0001] This utility model relates to the technical field of fully premixed wall-hung boilers, and in particular to a noise reduction device for fully premixed wall-hung boilers. Background Technology

[0002] A fully premixed combustion wall-hung boiler requires premixing gas and air according to a certain air coefficient ratio. The premixed gas is then injected into the burner for combustion. The combustion flame exchanges heat with the water in the surrounding heat exchange tubes to achieve the function of heating water.

[0003] If the gas-to-air equivalence ratio is unstable or the gas composition changes during operation of the wall-hung boiler, it will lead to an imbalance in the flame heat release rate, resulting in unstable local pressure fluctuations and generating thermoacoustic oscillation noise with an intensity of approximately 60dB to 85dB. This makes the surrounding environment noisy and affects the user experience. For the air intake system in a fully premixed combustion wall-hung boiler, the air intake of the DC inverter fan is connected to a venturi tube for pressure tapping. The resulting air intake structure is located inside the equipment housing. This air intake structure is one of the main pathways for the thermoacoustic oscillation noise generated in the combustion chamber to propagate inside the equipment housing.

[0004] Therefore, the key to suppressing the outward propagation of noise is to ensure that the noise energy generated in the combustion chamber is consumed during the transmission of the air intake structure to the inner cavity of the equipment casing. In the existing technology of fully premixed combustion wall-hung boilers, only some use simple sound insulation materials at the air intake structure for noise reduction, which has limited noise reduction effect and needs to be improved. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a silencer for a fully premixed wall-hung boiler to solve the above problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a silencing device for a fully premixed wall-hung boiler, which includes an air inlet inner pipe, a first silencing cotton cylinder, a first sleeve, a second silencing cotton cylinder, and a second sleeve.

[0008] One end of the inner air inlet tube is connected to a fan, and multiple rows of inner air inlet holes are formed on the inner air inlet tube; the first sound-absorbing cotton tube is sleeved on the inner air inlet tube, covering each inner air inlet hole; the first sleeve is sleeved outside the first sound-absorbing cotton tube, and multiple rows of first sleeve air inlet holes are formed on the first sleeve, the projection of each row of first sleeve air inlet holes along the radial direction of the inner air inlet tube on the inner air inlet tube does not overlap with each row of inner air inlet holes; the second sound-absorbing cotton tube is sleeved on the first sleeve, covering each first sleeve air inlet hole; the bottom end of the second sleeve away from the fan is sealed with a bottom plate, the second sleeve is sleeved outside the second sound-absorbing cotton tube, and multiple rows of second sleeve air inlet holes are formed on the second sleeve, the projection of each row of second sleeve air inlet holes along the radial direction of the first sleeve on the first sleeve does not overlap with each row of first sleeve air inlet holes.

[0009] Preferably, the air inlets of each inner tube in the same row extend radially along the air inlet inner tube, and the air inlets of each row are arranged in pairs around the circumference of the air inlet inner tube. The projection of the first sleeve air inlet of each row along the radial direction of the air inlet inner tube on the air inlet inner tube is located between the corresponding adjacent two rows of inner tube air inlets, and the projection of the second sleeve air inlet of each row along the radial direction of the first sleeve on the first sleeve is located between the corresponding adjacent two rows of first sleeve air inlets.

[0010] Preferably, the first sound-absorbing cotton cylinder includes a layer of sound-absorbing cotton and a layer of sound-insulating felt stacked together, and the sound-absorbing cotton layer has a plurality of honeycomb-shaped pores.

[0011] Preferably, the air inlet inner pipe, the first sleeve and the second sleeve are polypropylene pipes, the sound-absorbing cotton layer is polyurethane sound-absorbing cotton, and the sound insulation felt layer is a glass fiber rock wool composite felt layer.

[0012] Preferably, the diameter of the inner inlet pipe at the inlet is larger than the diameter of the air inlet hole, and the outer pipe opening of the second sleeve near the fan covers the inner pipe opening of the inner inlet pipe.

[0013] Preferably, the bottom plate of the second sleeve has a secondary air inlet, and the secondary air inlet is equipped with a funnel-shaped air guide connector, and the bottom of the air guide connector is provided with a sound-absorbing cotton sheet to block the secondary air inlet.

[0014] Preferably, one end of the air inlet pipe is connected to a fan via a venturi tube, and the fan is a DC inverter fan.

[0015] The main technical effects achieved by this utility model are as follows:

[0016] The silencing device provided by this utility model consists of an inner inlet pipe, a first silencing cotton cylinder, a first sleeve, a second silencing cotton cylinder, and a second sleeve arranged sequentially at the air inlet of a fan. Because the air inlet holes of the inner pipe and the first sleeve are misaligned, and the air inlets of the first and second sleeves are also misaligned, a multi-layered staggered turbulence hole structure is formed. Sound waves must propagate outwards through the air intake channel formed by the inner pipe air inlet of the inner pipe, the first silencing cotton cylinder, the first sleeve air inlet of the first sleeve, the second silencing cotton cylinder, and the second sleeve air inlet of the second sleeve. This prevents sound waves from directly and unobstructedly exiting the fan's air inlet. The misaligned sound wave propagation channel creates different diameters, compressing or expanding the medium to consume sound energy. Furthermore, when the air medium carrying the sound waves passes through the first and second silencing cotton cylinders, friction occurs with the pores of the silencing cotton, converting sound energy into heat energy, thus reducing the propagation of thermal oscillation noise from the fan. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a silencer device for a fully premixed wall-hung boiler provided by this utility model;

[0018] Figure 2 This is an exploded view of the structure of the silencing device;

[0019] Figure 3 This is a side view of the silencing device;

[0020] Figure 4 For the corresponding Figure 3 A half-sectional view of the section line A-A' in the diagram;

[0021] Figure 5 This is another side view of the silencing device;

[0022] Figure 6 For the corresponding Figure 5 A cross-sectional view of the section line B-B' in the diagram;

[0023] Figure 7 This is an exemplary microstructure diagram of the first sound-absorbing cotton tube in the sound-absorbing device;

[0024] Figure 8 This is a schematic diagram of another embodiment of the silencing device corresponding to the second sleeve;

[0025] Figure 9 For the corresponding Figure 8 Cross-sectional structural diagram.

[0026] The reference numerals in the above figures are as follows:

[0027] Inner air inlet 1, inner air inlet hole 10, inner air inlet 11;

[0028] First sound-absorbing cotton cylinder 2, sound-absorbing cotton layer 21, sound-insulating felt layer 22;

[0029] First sleeve 3, first sleeve air inlet 30;

[0030] Second sound-absorbing cotton tube 4;

[0031] Second sleeve 5, second sleeve air inlet 50, base plate 51, auxiliary air inlet 510, outer pipe inlet 52, air guide connector 53, sound-absorbing cotton sheet 54;

[0032] Fan 100, Venturi tube 200. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the drawings. The embodiments of this utility model shown in and described with reference to the drawings are merely exemplary, and this utility model is not limited to these embodiments.

[0034] To avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not of great importance are omitted.

[0035] like Figure 1 and Figure 2 As shown, this utility model embodiment provides a silencing device for a fully premixed wall-hung boiler, which includes an air inlet pipe 1, a first silencing cotton cylinder 2, a first sleeve 3, a second silencing cotton cylinder 4, and a second sleeve 5.

[0036] Combination Figures 3 to 6 As shown, one end of the inner air inlet pipe 11 is connected to a fan 100, and the inner air inlet pipe 1 has multiple rows of inner air inlet holes 10. The first sound-absorbing cotton cylinder 2 is sleeved on the inner air inlet pipe 1, covering each inner air inlet hole 10. The first sleeve 3 is sleeved outside the first sound-absorbing cotton cylinder 2, and the first sleeve 3 has multiple rows of first sleeve air inlet holes 30. The projection of each row of first sleeve air inlet holes 30 on the inner air inlet pipe 1 along the radial direction of the inner air inlet pipe 1 is parallel to the projection of each row of inner air inlet holes 10. The air holes 10 do not overlap; the second sound-absorbing cotton cylinder 4 is sleeved on the first sleeve 3, covering each of the first sleeve air inlets 30; the bottom end of the cylinder away from the fan 100 on the second sleeve 5 is covered with a bottom plate 51, the second sleeve 5 is sleeved outside the second sound-absorbing cotton cylinder 4, and multiple rows of second sleeve air inlets 50 are opened on the second sleeve 5. The projection of each row of second sleeve air inlets 50 on the first sleeve 3 along the radial direction of the first sleeve 3 does not overlap with each row of first sleeve air inlets 30.

[0037] The working principle of the silencer device of the above-mentioned fully premixed wall-hung boiler is as follows:

[0038] By installing the aforementioned silencing device at the air inlet of the fan 100, when thermal oscillation noise is generated, it enters the silencing device from the fan 100 through the inner pipe port 11 of the inner air inlet pipe 1. Since the bottom end of the second sleeve 5, which is sleeved on the outermost part of the silencing device, is covered with a bottom plate 51, the inner pipe air inlet 10 is misaligned with the first sleeve air inlet 30, and the first sleeve air inlet 30 is misaligned with the second sleeve air inlet 50, forming a multi-layered staggered turbulence hole structure. The sound wave needs to pass sequentially through the inner pipe air inlet 10 of the inner air inlet pipe 1, the first silencing cotton cylinder 2, the first sleeve air inlet 30 of the first sleeve 3, the second silencing cotton cylinder 4, and the second sleeve air inlet of the second sleeve 5. The air intake channel of the vent 50 propagates outward, preventing sound waves from being directly and unobstructed from the air inlet of the fan 100. The first sound-absorbing cotton cylinder 2 and the second sound-absorbing cotton cylinder 4 are set between the two intervals of the air intake inner pipe 1, the first sleeve 3, and the second sleeve 5. The sound-absorbing cotton material of the first sound-absorbing cotton cylinder 2 and the second sound-absorbing cotton cylinder 4 has a large number of tiny interconnected pores. When sound can penetrate into the material along these material pores, due to the air viscosity resistance and the vibration friction between the air and the material pore wall, the sound energy will be converted into heat energy and consumed. In addition, different diameters are formed in the misaligned sound wave propagation channel, realizing the compression or expansion deformation of the medium, thereby consuming sound energy and suppressing the outward propagation of noise.

[0039] Furthermore, the multi-layered staggered perforation structure smooths and stabilizes the airflow entering the inner air intake duct 1, facilitating airflow control and ensuring accurate air-fuel ratio, thus controlling thermal oscillation noise at its source. Additionally, the second sound-absorbing cotton cylinder 4, combined with the sleeve misalignment structure, prevents dust in the air from directly entering the fan 100, effectively avoiding blockage of the combustion system channels and preventing combustion instability caused by load changes, thereby controlling the generation of thermal oscillation noise.

[0040] Specifically, each inner tube air inlet hole 10 in the same row extends radially along the inner tube 1. The inner tube air inlets 10 in each row are arranged in pairs around the circumference of the inner tube 1, that is, the inner tube air inlets in adjacent rows are arranged at the same interval. The projection of the first sleeve air inlet hole 30 in each row along the radial direction of the inner tube 1 on the inner tube 1 is located between the corresponding two adjacent rows of inner tube air inlets 10. The projection of the second sleeve air inlet hole 50 in each row along the radial direction of the first sleeve 3 on the first sleeve 3 is located between the corresponding two adjacent rows of first sleeve air inlets 30. That is, the first sleeve air inlets 30 in multiple rows and the inner tube air inlets 10 in multiple rows are arranged alternately. The second sleeve air inlets 50 in multiple rows and the first sleeve air inlets 30 in multiple rows are arranged alternately. The arrangement of the inner tube air inlet 10, the first sleeve air inlet 30, and the second sleeve air inlet 50 in the above array form is relatively clear, and the structure is easy to manufacture and install.

[0041] like Figure 7 As shown, the first sound-absorbing cotton cylinder 2 includes a layered sound-absorbing cotton layer 21 and a sound-insulating felt layer 22. The sound-absorbing cotton layer 21 has multiple honeycomb-shaped pores. When sound waves are incident on the sound-absorbing cotton layer 21, the sound waves penetrate into the material along these honeycomb-shaped pores, and the sound energy is gradually converted into heat energy and consumed, achieving 60% to 80% sound energy consumption of mid-to-high frequency noise. The sound-insulating felt layer 22 can block low-frequency noise that has not been absorbed by the sound-absorbing cotton layer 21, achieving comprehensive coverage and weakening of sound waves in all frequency bands, and improving the effect of suppressing noise propagation. Similarly, the second sound-absorbing cotton cylinder 4 can also be equipped with the same sound-absorbing cotton layer 21 and sound-insulating felt layer 22 to form its sound-absorbing structure.

[0042] For example, the air inlet pipe 1, the first sleeve 3 and the second sleeve 5 are polypropylene pipes, which can be formed by vacuum forming process. The sound-absorbing cotton layer 21 is polyurethane sound-absorbing cotton, which has the advantages of high temperature resistance, good chemical stability, good toughness and flame retardancy reaching V0 level, and meets the needs of wall-hung boilers. The sound insulation felt layer 22 is a glass fiber rock wool composite felt layer.

[0043] Specifically, in combination Figure 2 and Figure 3 As shown, the diameter of the inner inlet pipe 1 at the inner pipe opening 11 is larger than the diameter of the inner pipe inlet hole 10. That is, the diameter of the inner inlet pipe 1 at the connection port with the fan 100 is larger than that of other areas. The outer pipe opening 52 of the second sleeve 5 near the fan 100 covers the inner pipe opening 11 of the inner inlet pipe 1. During installation, first, the inner pipe opening 11 of the inner inlet pipe 1 is fitted onto the connection port with the fan 100, i.e., the air inlet. Then, the first sound-absorbing cotton cylinder 2, the first sleeve 3, and the second sound-absorbing cotton cylinder 4 are fitted one by one into the area where the inner pipe inlet hole 10 of the inner inlet pipe 1 is located. Finally, the second sleeve 5 is fitted onto the outermost layer. The outer pipe opening 52 of the second sleeve 5 covers the inner pipe opening 11 of the inner inlet pipe 1. Under the coverage of the second sleeve 5, the connection between the inner inlet pipe 1 and the fan 100 is more compact.

[0044] In this embodiment, the diameters of the inner tube air inlet 10, the first sleeve air inlet 30, and the second sleeve air inlet 50 are set according to the air intake requirements. As long as the total area of ​​all air inlets on the air intake channel is not less than the area of ​​the connection between the inner air intake tube 1 and the fan 100, the air intake volume is not affected. Furthermore, combined with... Figure 8 and Figure 9As shown, in another embodiment of the second sleeve 5, the bottom plate 51 of the second sleeve 5 is provided with a secondary air inlet 510. The secondary air inlet 510 is equipped with a funnel-shaped air guide connector 53. The bottom of the air guide connector 53 is provided with a sound-absorbing cotton sheet 54 to block the secondary air inlet 510. By appropriately selecting the aperture of the secondary air inlet 510, the air intake can be increased, and with the assistance of the sound-absorbing cotton sheet 54, the impact on noise propagation is small.

[0045] Specifically, one end of the air inlet pipe 1 is connected to the fan 100 via a venturi tube 200, and the fan 100 is a DC inverter fan.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A noise reduction device for a fully premixed wall-hung boiler, characterized in that, It includes: An air inlet pipe (1) is provided, with a fan (100) connected to one end of the air inlet pipe (11) at the pipe opening (11). Multiple rows of air inlet holes (10) are provided on the air inlet pipe (1). The first sound-absorbing cotton tube (2) is sleeved on the air inlet inner tube (1) and covers each air inlet hole (10) of the inner tube; The first sleeve (3) is sleeved outside the first sound-absorbing cotton tube (2). The first sleeve (3) has multiple rows of first sleeve air inlets (30). The projection of each row of first sleeve air inlets (30) on the air inlet inner tube (1) along the radial direction of the air inlet inner tube (1) does not overlap with each row of inner tube air inlets (10). The second sound-absorbing cotton tube (4) is sleeved on the first sleeve (3) and covers each air inlet (30) of the first sleeve; The second sleeve (5) has a bottom plate (51) at the bottom end of the cylinder away from the fan (100). The second sleeve (5) is sleeved outside the second sound-absorbing cotton cylinder (4). Multiple rows of second sleeve air inlets (50) are opened on the second sleeve (5). The projection of each row of second sleeve air inlets (50) on the first sleeve (3) along the radial direction of the first sleeve (3) does not overlap with each row of first sleeve air inlets (30).

2. The silencing device for a fully premixed wall-hung boiler according to claim 1, characterized in that, Each inner tube air inlet hole (10) in the same row extends radially along the air inlet inner tube (1). The inner tube air inlets (10) in each row are arranged in pairs around the circumference of the air inlet inner tube (1). The projection of the first sleeve air inlet hole (30) in each row along the radial direction of the air inlet inner tube (1) on the air inlet inner tube (1) is located between the corresponding adjacent two rows of inner tube air inlets (10). The projection of the second sleeve air inlet hole (50) in each row along the radial direction of the first sleeve (3) on the first sleeve (3) is located between the corresponding adjacent two rows of first sleeve air inlets (30).

3. The silencing device for a fully premixed wall-hung boiler according to claim 1, characterized in that, The first sound-absorbing cotton tube (2) includes a sound-absorbing cotton layer (21) and a sound-insulating felt layer (22) stacked together, and the sound-absorbing cotton layer (21) has a plurality of honeycomb-shaped pores.

4. The silencing device for a fully premixed wall-hung boiler according to claim 3, characterized in that, The air inlet pipe (1), the first sleeve (3) and the second sleeve (5) are polypropylene pipes, the sound-absorbing cotton layer (21) is polyurethane sound-absorbing cotton, and the sound insulation felt layer (22) is a glass fiber rock wool composite felt layer.

5. The silencing device for a fully premixed wall-hung boiler according to claim 1, characterized in that, The diameter of the inner inlet pipe (1) at the inner pipe opening (11) is larger than the diameter of the inner pipe inlet hole (10). The outer pipe opening (52) of the second sleeve (5) near the fan (100) covers the inner pipe opening (11) of the inner inlet pipe (1).

6. The silencing device for a fully premixed wall-hung boiler according to claim 1, characterized in that, The second sleeve (5) has a base plate (51) with a secondary air inlet (510), and a funnel-shaped air guide connector (53) is installed on the secondary air inlet (510). The bottom of the air guide connector (53) is provided with a sound-absorbing cotton sheet (54) to block the secondary air inlet (510).

7. The silencing device for a fully premixed wall-hung boiler according to claim 1, characterized in that, One end of the air inlet pipe (1) is connected to the fan (100) through a venturi tube (200), and the fan (100) is a DC inverter fan.

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