Premixing noise reducing combustor

Abstract

The application discloses a premixing noise reduction burner and relates to the technical field of burners. The premixing noise reduction burner comprises a burner body and a gas mixing structure. The burner body is internally formed with a first premixing chamber and a second premixing chamber. A first sound insulation plate is located between the first premixing chamber and the second premixing chamber. The burner body is provided with a second sound insulation plate opposite to the first sound insulation plate. The first sound insulation plate is provided with an ignition mechanism. The gas mixing structure is arranged in the second premixing chamber. The first premixing chamber and the second premixing chamber of the premixing noise reduction burner can be used for mixing air and gas. The first sound insulation plate and the second sound insulation plate can reduce the flow rate of the mixed gas, so that the mixed gas can be more fully mixed. Meanwhile, the first sound insulation plate and the second sound insulation plate can also reduce the noise of the mixed gas. Therefore, the premixing noise reduction burner can fully mix the air and the gas, stably burn the mixed gas and effectively reduce the noise of the mixed gas.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and in particular to a premixed noise-reducing burner. Background Technology

[0002] In terms of related technologies, the burner generates noise during operation. The generation of noise is related to a variety of factors. In premixed combustion, the rapid change in combustion rate, the dynamic characteristics of flame propagation, and the mixing process of gas and air all generate noise. Existing burner noise reduction technologies are difficult to achieve the effect of both mixing gas and air and keeping the noise level low. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a premixed noise-reducing burner that can both fully mix and stably combust air and fuel gas, and reduce the noise of the premixed noise-reducing burner.

[0004] A premixed noise-reducing burner according to an embodiment of the present invention includes: a burner body, wherein a first premixing chamber and a second premixing chamber are formed within the burner body, and the burner body has an air inlet and a gas inlet, both of which are connected to the first premixing chamber; the burner body has a first sound insulation plate located between the first premixing chamber and the second premixing chamber, the burner body has a second sound insulation plate opposite to the first sound insulation plate, the second premixing chamber being located between the first sound insulation plate and the second sound insulation plate, the first sound insulation plate having a plurality of first through holes connecting the first premixing chamber and the second premixing chamber, the first sound insulation plate being provided with an ignition mechanism, and the second sound insulation plate having a plurality of second through holes communicating with the second premixing chamber; and a gas mixing structure disposed within the second premixing chamber.

[0005] According to the embodiments of the present invention, the first and second premixing chambers of the premixing noise reduction burner can both be used to mix air and fuel gas. The first and second sound insulation plates can both reduce the flow rate of the mixed gas so that the mixed gas can be mixed more fully. At the same time, the first and second sound insulation plates can also reduce the noise of the mixed gas. The premixing noise reduction burner can make air and fuel gas mix fully and burn stably, and can effectively reduce the noise of the premixing noise reduction burner.

[0006] In some embodiments of the present invention, the gas mixing structure is fixed to the burner body, and the distance between the gas mixing structure and the first sound insulation plate is smaller than the distance between the gas mixing structure and the second sound insulation plate.

[0007] In some embodiments of the present invention, the gas mixing structure includes: gas mixing blades, wherein the gas mixing blades are arc-shaped.

[0008] In some embodiments of the present invention, there are multiple mixing blades, and the multiple mixing blades are arranged circumferentially along the second premixing chamber.

[0009] In some embodiments of the present invention, the gas mixing structure further includes: a fixing plate, the fixing plate being fixed to the burner body, a third through hole being formed in the middle of the fixing plate, and a plurality of gas mixing blades being located on the side of the fixing plate facing the first sound insulation plate, the plurality of gas mixing blades being fixed to the fixing plate and arranged around the third through hole.

[0010] In some embodiments of the present invention, the interval angle between two adjacent mixing blades is β, which satisfies the relationship: 20°≤β≤30°.

[0011] In some embodiments of the present invention, the first sound insulation board is constructed as one of a foam ceramic board, a glass fiber cotton board, or a glass fiber woven mesh board.

[0012] In some embodiments of the present invention, the premixed noise-reducing burner further includes: a metal plate, the metal plate being fixedly disposed in the second premixing chamber and located between the gas mixing structure and the second sound insulation plate, the metal plate having a fourth through hole.

[0013] In some embodiments of the present invention, the spacing between the metal plate and the gas mixing structure is smaller than the spacing between the metal plate and the second sound insulation plate.

[0014] In some embodiments of the present invention, the first sound insulation plate and the burner body are fixedly connected.

[0015] In some embodiments of the present invention, the burner body includes: a shell, the shell including a first end wall, a second end wall and an annular side wall, the first end wall and the second end wall being opposite to and spaced apart, the annular side wall being connected between the first end wall and the second end wall to form a premixing chamber, a first sound insulation plate being disposed in the premixing chamber to divide the premixing chamber into the first premixing chamber and the second premixing chamber, the first end wall having a fifth through hole configured as the air inlet, the second end wall being configured as the second sound insulation plate; and a gas inlet pipe, the gas inlet pipe extending into the first premixing chamber and spaced apart from the first sound insulation plate, and the gas inlet pipe having an air intake channel configured as the gas inlet.

[0016] In some embodiments of the present invention, the gas inlet pipe extends along the arrangement direction of the first end wall and the second end wall, and a portion of the gas inlet pipe is located within the fifth through hole and spaced apart from the inner wall of the fifth through hole.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of a premixed noise-reducing burner according to an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional schematic diagram of a premixed noise-reducing burner according to an embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional schematic diagram of a premixed noise-reducing burner according to an embodiment of the present invention from another angle;

[0022] Figure 4 This is a schematic diagram of a premixed noise-reducing burner according to an embodiment of the present invention from another angle.

[0023] Figure label:

[0024] Burner body 1; First premixing chamber 11; Second premixing chamber 12; Air inlet 13; Gas inlet 14; First sound insulation plate 15; First through hole 151; Second sound insulation plate 16; Second through hole 161; Outer shell 17; First end wall 171; Fifth through hole 1711; Second end wall 172; Annular side wall 173; Gas inlet pipe 18; Air inlet channel 181;

[0025] 2. Mixing structure; 21. Mixing blade; 22. Fixing plate; 221. Third through hole;

[0026] Metal plate 3; Fourth through hole 31;

[0027] Premixed noise-reducing burner 100. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In existing premixed burners, the gas and air are mixed before entering the combustion chamber to form a combustible mixture. When the mixture is ignited, the combustion process is not uniform but unfolds in the mixture in the form of flame propagation. This unfolding process is accompanied by rapid pressure and temperature changes, which can generate sound waves in the combustion chamber, i.e., combustion noise.

[0030] Combustion noise is generated by a variety of factors, including non-uniform combustion rate, fluctuations in pressure and temperature within the combustion chamber, combustion instability, and rapid expansion of combustion products. In premixed combustion, these factors are particularly pronounced due to the rapid changes in combustion rate and the dynamic characteristics of flame propagation, resulting in higher noise levels.

[0031] Specifically, the generation of combustion noise can be divided into several stages:

[0032] Initial stage of combustion: Ignition creates a local high-temperature area, and then the flame begins to spread in the combustible gas mixture. During this process, shock waves and pressure fluctuations are generated.

[0033] Combustion propagation stage: The flame continues to propagate in the combustion chamber. The non-uniformity of the combustion rate leads to the propagation of pressure and temperature fluctuations. These fluctuations are reflected and superimposed in the combustion chamber, forming a complex acoustic wave structure.

[0034] Stable combustion phase: Once the flame has spread to all the combustible mixture in the combustion chamber, combustion will enter a relatively stable state, but periodic pressure and temperature fluctuations may still occur.

[0035] End of combustion stage: After combustion is complete, the pressure and temperature in the combustion chamber drop rapidly, and sound waves are also generated during this process.

[0036] Controlling combustion noise typically involves measures such as optimizing combustion parameters, improving combustion chamber design, and using sound-absorbing materials to reduce noise generation and propagation.

[0037] Currently, common noise reduction technologies for boiler burners include sound insulation devices. These devices significantly reduce the noise generated by the burner by employing sound absorption, sound insulation, or noise reduction techniques. For example, some devices use a soundproof enclosure for the burner inside, with noise-reducing material filled between the enclosure and the burner, effectively reducing noise levels. Measurements taken two meters from the burner show a noise reduction of approximately 20 decibels. However, installing boiler burner noise reduction devices requires a certain cost, including equipment purchase, installation, commissioning, and subsequent maintenance, which increases the financial burden.

[0038] Therefore, developing premixed noise-reducing combustion technology has become an urgent technical challenge that needs to be addressed.

[0039] The following is for reference. Figures 1-4 A premixed noise-reducing burner 100 according to an embodiment of the present invention is described, which can both fully mix air and fuel gas and reduce the operating noise of the premixed noise-reducing burner 100.

[0040] refer to Figures 1-4 As shown, a premixed noise-reducing burner 100 according to an embodiment of the present invention includes: a burner body 1 and a mixing structure 2. A first premixing chamber 11 and a second premixing chamber 12 are formed within the burner body 1. The burner body 1 has an air inlet 13 and a gas inlet 14, both of which communicate with the first premixing chamber 11. A first sound insulation plate 15 is located within the burner body 1, between the first premixing chamber 11 and the second premixing chamber 12. Body 1 has a second sound insulation plate 16 opposite to the first sound insulation plate 15. The second premixing chamber 12 is located between the first sound insulation plate 15 and the second sound insulation plate 16. The first sound insulation plate 15 has a plurality of first through holes 151, which connect the first premixing chamber 11 and the second premixing chamber 12. The first sound insulation plate 15 is provided with an ignition mechanism. The second sound insulation plate 16 has a plurality of second through holes 161, which connect the second premixing chamber 12. The gas mixing structure 2 is disposed in the second premixing chamber 12.

[0041] The premixed noise-reducing burner 100 has an air inlet 13 and a gas inlet 14 in its burner body 1. A first premixing chamber 11 and a second premixing chamber 12 are formed inside the burner body 1. Both the air inlet 13 and the gas inlet 14 are connected to the first premixing chamber 11. Air can enter the first premixing chamber 11 of the burner body 1 from the air inlet 13, and gas can enter the first premixing chamber 11 of the burner body 1 from the gas inlet 14. The air and gas can be mixed in the first premixing chamber 11 to form a combustible mixture, which is conducive to complete and stable combustion.

[0042] A first sound insulation plate 15 is formed inside the burner body 1. The first sound insulation plate 15 is disposed between the first premixing chamber 11 and the second premixing chamber 12. The first sound insulation plate 15 is provided with an ignition mechanism, which can ignite the mixed gas. The mixed gas can burn on the surface and inside of the first sound insulation plate 15. The mixed gas can enter the second premixing chamber 12 through multiple first through holes 151 on the first sound insulation plate 15. The first sound insulation plate 15 can block the mixed gas. The first sound insulation plate 15 can also change the flow direction of the mixed gas, reducing the kinetic energy of the mixed gas. That is to say, the first sound insulation plate 15 can reduce the flow rate of the mixed gas. The slower flow rate of the mixed gas can have more time to be fully mixed in the first premixing chamber 11. Furthermore, the noise of the slower flow rate of the mixed gas is also reduced accordingly.

[0043] The second premixing chamber 12 is provided with a gas mixing structure 2. The mixed gas entering the second premixing chamber 12 from the first through hole 151 is more fully mixed under the action of the gas mixing structure 2. The gas mixing structure 2 can be movably arranged in the second premixing chamber 12. For example, the gas mixing structure 2 can be a swing plate, a rotating plate, a rotating fan, etc., but the present invention is not limited to this. The gas mixing structure 2 can also be set in other structural forms, as long as the gas mixing structure 2 can play the role of further mixing the mixed gas.

[0044] The second sound insulation plate 16 has multiple second through holes 161, which can be constructed as circular holes or regular hexagonal holes, etc. The second through holes 161 are connected to the second premixing chamber 12. The mixed gas in the second premixing chamber 12 can flow out of the premixed noise reduction burner 100 through the multiple second through holes 161 of the second sound insulation plate 16. The second sound insulation plate 16 can block the mixed gas and change the flow direction of the mixed gas, thereby reducing the kinetic energy of the mixed gas. In other words, the second sound insulation plate 16 can reduce the flow rate of the mixed gas. The mixed gas with a slower flow rate in the second premixing chamber 12 can have more time to mix fully in the second premixing chamber 12, and the noise of the mixed gas with a slower flow rate is also reduced accordingly.

[0045] In the above embodiments, the first premixing chamber 11 and the second premixing chamber 12 of the premixed noise-reducing burner 100 can both be used to mix air and fuel gas. The first sound insulation plate 15 and the second sound insulation plate 16 can both reduce the flow rate of the mixed gas so that the mixed gas can be mixed more fully. At the same time, the first sound insulation plate 15 and the second sound insulation plate 16 can also reduce the noise of the mixed gas. The premixed noise-reducing burner 100 can make air and fuel gas mix fully and burn stably, and effectively reduce the noise of the premixed noise-reducing burner 100.

[0046] In embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the gas mixing structure 2 is fixed to the burner body 1, and the distance between the gas mixing structure 2 and the first sound insulation plate 15 is smaller than the distance between the gas mixing structure 2 and the second sound insulation plate 16.

[0047] The gas mixing structure 2 can be fixedly connected to the burner body 1. The gas mixing structure 2 and the burner body 1 can be welded, snapped, bolted, etc. Along the arrangement direction of the first sound insulation plate 15 and the second sound insulation plate 16, the interval between the gas mixing structure 2 and the first sound insulation plate 15 can be smaller than the interval between the gas mixing structure 2 and the second sound insulation plate 16, so that the mixed gas flowing through the first sound insulation plate 15 and entering the second premixing chamber 12 can flow to the gas mixing structure 2 more quickly and be mixed by the gas mixing structure 2, so as to form a more fully mixed gas mixture more quickly, thereby making the combustion more stable.

[0048] In embodiments of the present invention, such as Figures 1-3 As shown, the gas mixing structure 2 includes: gas mixing blade 21, which is arc-shaped.

[0049] The gas mixing structure 2 may include a gas mixing blade 21, which may be constructed in an arc shape, such as a circular arc structure or a similar circular arc structure. When the mixed gas entering the second premixing chamber 12 from the first through hole 151 flows to the gas mixing blade 21, the gas mixing blade 21 may be fixed to the burner body 1. The arc-shaped gas mixing blade 21 can change the flow direction of the mixed gas, causing the mixed gas to rotate. This rotational motion is beneficial for gas mixing, making the mixed gas more uniform and complete, and thus enabling more stable combustion of the mixed gas.

[0050] In embodiments of the present invention, such as Figures 1-3 As shown, there are multiple mixing blades 21, which are arranged circumferentially along the second premixing chamber 12.

[0051] The mixing blades 21 can be configured as multiple, and the number of mixing blades 21 can be, but is not limited to, four, six, eight, etc. The multiple mixing blades 21 can be arranged circumferentially along the second premixing chamber 12. Furthermore, the multiple mixing blades 21 can be evenly arranged circumferentially along the second premixing chamber 12, and the interval between any two adjacent mixing blades 21 is the same. When the mixed gas entering the second premixing chamber 12 from the first through hole 151 flows to the multiple mixing blades 21, the multiple mixing blades 21 can act on the mixed gas simultaneously, so that the mixed gas can be mixed more fully and more evenly, thereby making the mixed gas burn more stably.

[0052] In embodiments of the present invention, such as Figure 2 and Figure 3 As shown, the gas mixing structure 2 may further include: a fixing plate 22, which is fixed to the burner body 1. A third through hole 221 is formed in the middle of the fixing plate 22. Multiple gas mixing blades 21 are located on the side of the fixing plate 22 facing the first sound insulation plate 15. Multiple gas mixing blades 21 are fixed to the fixing plate 22 and arranged around the third through hole 221.

[0053] The fixing plate 22 of the gas mixing structure 2 can be fixed to the burner body 1. The fixing plate 22 can be fixed to the burner body 1 by welding, bonding, or other methods, or it can be integrally formed with the burner body 1. Multiple gas mixing blades 21 can be fixed to the fixing plate 22, and all multiple gas mixing blades 21 are located on the side of the fixing plate 22 facing the first sound insulation plate 15. That is, if... Figure 2As shown, multiple air mixing blades 21 are located on the left end face of the fixing plate 22. The air mixing blades 21 can be fixed to the fixing plate 22 by welding, bonding or other methods. The fixing plate 22 can also be integrally formed with the air mixing blades 21. The fixing plate 22 may include a third through hole 221. Multiple air mixing blades 21 can be arranged around the third through hole 221 in the circumferential direction. After the mixed gas flowing through the mixing structure 2 is more thoroughly mixed by multiple mixing blades 21, the mixed gas can flow to the second sound insulation plate 16 through the third through hole 221. The cross-section of the third through hole 221 is relatively small, which can reduce the flow rate of the mixed gas through the fixed plate 22 per unit time. The fixed plate 22 can block the mixed gas and change the flow direction of the mixed gas, thereby reducing the kinetic energy of the mixed gas. In other words, it can reduce the flow rate of the mixed gas. The slower flow rate of the mixed gas can have more time to be fully mixed in the second premixing chamber 12. In addition, the noise of the slower flow rate of the mixed gas is also reduced accordingly, so as to achieve the effect of fully mixing and stabilizing the mixed gas and reducing noise.

[0054] In embodiments of the present invention, such as Figure 3 As shown, the interval angle between two adjacent mixing blades 21 is β, which satisfies the relationship: 20°≤β≤30°.

[0055] The interval angle β between the two mixing blades 21 can satisfy the relationship: 20°≤β≤30°. The interval angle β between the two mixing blades 21 can be, but is not limited to, 20°, 25°, 30°, etc. This setting can be more conducive to the full mixing of the gas mixture, so that the gas mixture can burn more stably.

[0056] In an embodiment of the present invention, the first sound insulation board 15 is constructed as one of a foam ceramic board, a glass fiber cotton board, or a glass fiber woven mesh board.

[0057] The first sound insulation board 15 can be constructed as one of a foam ceramic board, a fiberglass cotton board, or a fiberglass woven mesh board. The foam ceramic board has a porous structure, which can effectively block the transmission of sound to reduce the noise of the mixed gas flowing through the first sound insulation board 15. The fiber structure of the fiberglass cotton board can absorb sound to reduce the noise reflection and transmission of the mixed gas. The fiberglass woven mesh board can absorb sound more effectively and reduce the noise of the mixed gas.

[0058] In embodiments of the present invention, such as Figures 1-3 As shown, the premixed noise reduction burner 100 may further include: a metal plate 3, which is fixed in the second premixing chamber 12 and is located between the gas mixing structure 2 and the second sound insulation plate 16. The metal plate 3 has a fourth through hole 31.

[0059] The metal plate 3 of the premixed noise-reducing burner 100 can be fixed in the second premixing chamber 12. The metal plate 3 can be welded, bolted, or snapped to the burner body 1. The metal plate 3 can be located between the gas mixing structure 2 and the second sound insulation plate 16. The metal plate 3 can include at least one fourth through hole 31 through which the mixed gas can flow. The metal plate 3 can block the mixed gas and change the flow direction of the mixed gas, thereby reducing the kinetic energy of the mixed gas. In other words, the metal plate 3 can reduce the flow rate of the mixed gas so that the mixed gas can be more fully mixed in the second premixing chamber 12, so that the mixed gas can burn stably. Furthermore, the noise of the mixed gas with a slower flow rate is also reduced accordingly.

[0060] As some embodiments of the present invention, the fourth through hole 31 of the metal plate 3 can be a sintered hole with large gaps. The metal plate 3 with large gap sintered holes has the advantages of high temperature resistance, corrosion resistance and high strength, which can improve the durability of the metal plate 3 and extend its service life.

[0061] In embodiments of the present invention, such as Figure 1 and 2 As shown, the distance between the metal plate 3 and the air mixing structure 2 is smaller than the distance between the metal plate 3 and the second sound insulation plate 16.

[0062] Specifically, the distance between the metal plate 3 and the gas mixing structure 2 can be made smaller than the distance between the metal plate 3 and the second sound insulation plate 16, so that the metal plate 3 can reduce the flow rate of the mixed gas earlier, so that the residence time of the mixed gas in the second premixing chamber 12 is longer, thereby allowing the mixed gas to be mixed more fully and so that the mixed gas can burn more stably.

[0063] In embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the first sound insulation plate 15 is fixedly connected to the burner body 1.

[0064] As some embodiments of the present invention, the first sound insulation plate 15 and the burner body 1 can be integrally formed. The integrally formed part has good structural strength. By making the first sound insulation plate 15 and the burner body 1 integrally formed, the probability of breakage at the connection between the first sound insulation plate 15 and the burner body 1 can be reduced, and the connection stability between the first sound insulation plate 15 and the burner body 1 can be improved, thereby improving the reliability of the premixed noise reduction burner 100.

[0065] In some other embodiments of the present invention, the first sound insulation plate 15 and the burner body 1 can be separate components. By setting the first sound insulation plate 15 and the burner body 1 as separate components, the first sound insulation plate 15 and the burner body 1 can be designed and manufactured separately. The first sound insulation plate 15 and the burner body 1 can be welded, snapped, or bolted together, which can reduce the difficulty of designing and manufacturing the first sound insulation plate 15 and the burner body 1 and improve the efficiency of designing and manufacturing the first sound insulation plate 15 and the burner body 1.

[0066] In embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the burner body 1 may include: a housing 17 and a gas inlet pipe 18. The housing 17 includes a first end wall 171, a second end wall 172 and an annular side wall 173. The first end wall 171 and the second end wall 172 are opposite to each other and spaced apart. The annular side wall 173 is connected between the first end wall 171 and the second end wall 172 to form a premixing chamber. A first sound insulation plate 15 is disposed in the premixing chamber to divide the premixing chamber into a first premixing chamber 11 and a second premixing chamber 12. The first end wall 171 forms a fifth through hole 1711, which is configured as an air inlet 13. The second end wall 172 is configured as a second sound insulation plate 16. The gas inlet pipe 18 extends into the first premixing chamber 11 and is spaced apart from the first sound insulation plate 15. The gas inlet pipe 18 forms an air intake channel 181, which is configured as a gas inlet 14.

[0067] The outer shell 17 of the burner body 1 may include a first end wall 171, a second end wall 172, and an annular side wall 173. The first end wall 171 and the second end wall 172 may be arranged opposite to each other and spaced apart. The annular side wall 173 may be connected between the first end wall 171 and the second end wall 172. The annular side wall 173, the first end wall 171, and the second end wall 172 together define a premixing chamber. A first sound insulation plate 15 is disposed in the premixing chamber to divide the premixing chamber into a first premixing chamber 11 and a second premixing chamber 12. The first sound insulation plate 15 can be used to reduce the flow rate of the mixed gas and reduce the noise of the mixed gas. The first end wall 171 may have a fifth through hole 1711. The fifth through hole 1711 may be configured as an air inlet 13. Air can enter the first premixing chamber 11 through the fifth through hole 1711. The second end wall 172 may be configured as a second sound insulation plate 16. The second sound insulation plate 16 can reduce the flow rate of the mixed gas and reduce the noise of the mixed gas.

[0068] The gas inlet pipe 18 of the burner body 1 can extend into the first premixing chamber 11. The gas inlet pipe 18 can form an air intake channel 181, which can be configured as a gas inlet 14. Gas can enter the first premixing chamber 11 through the air intake channel 181. The gas inlet pipe 18 can be separated from the first sound insulation plate 15, and a flow gap is formed between the gas inlet pipe 18 and the first sound insulation plate 15. The flow gap connects the first premixing chamber 11 and the air intake channel 181. Gas can flow into the first premixing chamber 11 through the flow gap, so that the gas flowing through the gas inlet pipe 18 can enter the first premixing chamber 11. Gas and air can mix in the first premixing chamber 11 to form a mixed gas.

[0069] As some embodiments of the present invention, the first end wall 171 and the annular side wall 173 can be separate components, and the first end wall 171 and the annular side wall 173 can be designed separately, reducing the design difficulty.

[0070] As some embodiments of the present invention, the first end wall 171 and the annular side wall 173 can be integrally formed, which can reduce manufacturing difficulty and reduce the risk of breakage at the connection between the first end wall 171 and the annular side wall 173.

[0071] As some embodiments of the present invention, the second end wall 172 and the annular side wall 173 can be separate components, and the second end wall 172 and the annular side wall 173 can be designed separately, reducing the design difficulty.

[0072] As some embodiments of the present invention, the second end wall 172 and the annular side wall 173 can be integrally formed, which can reduce manufacturing difficulty and reduce the risk of breakage at the connection between the second end wall 172 and the annular side wall 173.

[0073] In embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the gas inlet pipe 18 extends along the arrangement direction of the first end wall 171 and the second end wall 172, and a portion of the gas inlet pipe 18 is located inside the fifth through hole 1711 and is spaced apart from the inner wall of the fifth through hole 1711.

[0074] The gas inlet pipe 18 can be arranged along the first end wall 171 and the second end wall 172. Figure 1 and Figure 2Extending in the left-right direction (as shown), the gas inlet pipe 18 can extend into the first premixing chamber 11 through the fifth through hole 1711. The outer peripheral wall of the gas inlet pipe 18 is spaced apart from the inner wall of the fifth through hole 1711, thereby forming an air intake gap between the outer peripheral wall of the gas inlet pipe 18 and the inner wall of the fifth through hole 1711. Air enters the first premixing chamber 11 through the air intake gap, facilitating air flow into the first premixing chamber 11. The gas entering the premixed noise reduction burner 100 through the gas inlet pipe 18 can flow towards the first sound insulation plate 15, so that air and gas can enter the first premixing chamber 11 through the corresponding air inlet 13 and gas inlet 14 respectively for mixing. This reduces the risk of mutual interference between gas and air during intake and facilitates the arrangement of external pipelines connected to the air inlet 13 and gas inlet 14 to provide air and gas, improving the practicality, rationality, and reliability of the premixed noise reduction burner 100.

[0075] The gas inlet pipe 18 is located inside the fifth through hole 1711, which makes the gas inlet pipe 18 and the fifth through hole 1711 more compact, which can improve space utilization, reduce the volume of the premixed noise reduction burner 100, and facilitate the installation of the premixed noise reduction burner 100.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0077] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0078] In the description of this invention, "a plurality of" means two or more.

[0079] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0080] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A premixed noise-reducing burner (100), characterized in that, include: The burner body (1) has a first premixing chamber (11) and a second premixing chamber (12) formed therein. The burner body (1) has an air inlet (13) and a gas inlet (14), and the air inlet (13) and the gas inlet (14) are both connected to the first premixing chamber (11). The burner body (1) has a first sound insulation plate (15) located between the first premixing chamber (11) and the second premixing chamber (12). The burner body (1) has a second sound insulation plate (16) opposite to the first sound insulation plate (15). The second premixing chamber (12) is located between the first sound insulation plate (15) and the second sound insulation plate (16). The first sound insulation plate (15) has a plurality of first through holes (151) that connect the first premixing chamber (11) and the second premixing chamber (12). The first sound insulation plate (15) is provided with an ignition mechanism. The second sound insulation plate (16) has a plurality of second through holes (161) that connect the second premixing chamber (12). The gas mixing structure (2) is disposed in the second premixing chamber (12).

2. The premixed noise-reducing burner (100) according to claim 1, characterized in that, The gas mixing structure (2) is fixed to the burner body (1), and the distance between the gas mixing structure (2) and the first sound insulation plate (15) is smaller than the distance between the gas mixing structure (2) and the second sound insulation plate (16).

3. The premixed noise-reducing burner (100) according to claim 1, characterized in that, The gas mixing structure (2) includes: gas mixing blade (21), which is arc-shaped.

4. The premixed noise-reducing burner (100) according to claim 3, characterized in that, There are multiple mixing blades (21), and the multiple mixing blades (21) are arranged circumferentially along the second premixing chamber (12).

5. The premixed noise-reducing burner (100) according to claim 4, characterized in that, The gas mixing structure (2) further includes: a fixing plate (22), which is fixed to the burner body (1), and a third through hole (221) is formed in the middle of the fixing plate (22). A plurality of gas mixing blades (21) are located on the side of the fixing plate (22) facing the first sound insulation plate (15), and the plurality of gas mixing blades (21) are fixed to the fixing plate (22) and arranged around the third through hole (221).

6. The premixed noise-reducing burner (100) according to claim 5, characterized in that, The interval angle between two adjacent mixing blades (21) is β, which satisfies the relationship: 20°≤β≤30°.

7. The premixed noise-reducing burner (100) according to claim 1, characterized in that, The first sound insulation board (15) is constructed as one of foam ceramic board, glass fiber cotton board, and glass fiber woven mesh board.

8. The premixed noise-reducing burner (100) according to claim 1, characterized in that, Also includes: Metal plate (3) is fixed in the second premix chamber (12) and is located between the gas mixing structure (2) and the second sound insulation board (16). The metal plate (3) has a fourth through hole (31).

9. The premixed noise-reducing burner (100) according to claim 8, characterized in that, The distance between the metal plate (3) and the air mixing structure (2) is less than the distance between the metal plate (3) and the second sound insulation plate (16).

10. The premixed noise-reducing burner (100) according to claim 1, characterized in that, The first sound insulation plate (15) and the burner body (1) are fixedly connected.

11. The premixed noise-reducing burner (100) according to any one of claims 1-10, characterized in that, The burner body (1) includes: The outer casing (17) includes a first end wall (171), a second end wall (172), and an annular side wall (173). The first end wall (171) and the second end wall (172) are opposite to each other and spaced apart. The annular side wall (173) is connected between the first end wall (171) and the second end wall (172) to form a premixing chamber. The first sound insulation plate (15) is disposed in the premixing chamber to divide the premixing chamber into the first premixing chamber (11) and the second premixing chamber (12). The first end wall (171) has a fifth through hole (1711) which is configured as the air inlet (13). The second end wall (172) is configured as the second sound insulation plate (16). A gas inlet pipe (18) extends into the first premix chamber (11) and is spaced apart from the first sound insulation plate (15). The gas inlet pipe (18) forms an air intake channel (181), which is configured as the gas inlet (14).

12. The premixed noise-reducing burner (100) according to claim 11, characterized in that, The gas inlet pipe (18) extends along the arrangement direction of the first end wall (171) and the second end wall (172), and a portion of the gas inlet pipe (18) is located inside the fifth through hole (1711) and spaced apart from the inner wall of the fifth through hole (1711).

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