Premixing noise reducing burner for a burner and burner having it

Abstract

The application discloses a premixing noise reduction burner of a combustor and a combustor with the same, and relates to the technical field of combustors.The premixing noise reduction burner comprises a shell, a flow divider, a gas pipeline and an air pipeline, the flow divider is arranged in a containing space and defines a first premixing chamber, the flow divider and the inner wall of the shell jointly define a second premixing chamber, and the cross-sectional area of the flow divider gradually decreases from the middle of the flow divider to the two ends of the flow divider.Thus, by configuring the flow divider in the form of gradually decreasing cross-sectional area from the middle of the flow divider to the two ends of the flow divider, a larger sound absorption area can be provided by the flow divider, the sound absorption effect of the premixing noise reduction burner can be enhanced, the noise can be reduced, the acoustic effect can be improved, the use experience of the combustor can be improved, and the emission of nitrogen oxides can be reduced and the environmental pollution can be reduced by separating the first premixing chamber and the second premixing chamber of the premixing noise reduction burner.

Description

Technical Field

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

[0002] Premixed burners are widely used in related technologies. However, the airflow mixing, injection, and periodic oscillations in pressure and temperature caused by combustion instability in premixed burners result in high noise levels and poor acoustic performance, which seriously affects the user experience of premixed burners. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a premixed noise-reducing burner that can reduce noise, improve acoustic performance, enhance the user experience of the burner, and reduce environmental pollution.

[0004] The present invention further proposes a burner having the above-mentioned premixed noise-reducing burner.

[0005] The premixed noise-reducing burner according to the present invention includes: a housing and a flow divider, the housing defining a receiving space, the flow divider disposed within the receiving space and defining a first premixing chamber, the flow divider and the inner wall of the housing jointly defining a second premixing chamber; a gas pipeline and an air pipeline, the gas pipeline and the air pipeline being connected to the first premixing chamber and the second premixing chamber respectively; the cross-sectional area of ​​the flow divider gradually decreases from the middle to both ends of the flow divider.

[0006] The premixed noise-reducing burner of the burner according to the present invention, by constructing the flow divider as having a gradually decreasing cross-sectional area from the middle to both ends of the flow divider, can provide a larger sound-absorbing area through the flow divider, thereby enhancing the sound absorption effect of the premixed noise-reducing burner, reducing noise, improving acoustic performance, and improving the user experience of the burner. Furthermore, by having the premixed noise-reducing burner have a separated first premixing chamber and a second premixing chamber, it can reduce nitrogen oxide emissions and reduce environmental pollution.

[0007] In an embodiment of the present invention, the premixed noise reduction burner further includes: a plurality of swirl blades, all of which are disposed in the second premixing chamber, and one end of each swirl blade is serrated.

[0008] In an embodiment of the present invention, the swirl blade is disposed on the flow divider, and the end of the swirl blade away from the air duct is constructed in a serrated shape; and / or, the swirl blade is constructed as an arc-shaped blade.

[0009] In an embodiment of the present invention, the premixed noise reduction burner further includes: a first orifice plate, the first orifice plate corresponding to the outlet end of the first premixed chamber, the first orifice plate having multiple sets of first through holes, the multiple sets of first through holes surrounding circumferentially, each set of first through holes including multiple first sub-through holes, the multiple first sub-through holes of each set of first through holes gradually moving away from the center of the first orifice plate and the hole diameter gradually increasing.

[0010] In an embodiment of the present invention, the centers of the plurality of first sub-through holes in each group of first through holes are arranged along a vortex line.

[0011] In an embodiment of the present invention, the premixed noise reduction burner further includes: a second orifice plate, the second orifice plate corresponding to the outlet end of the second premixed chamber, the second orifice plate having multiple sets of second through holes, the multiple sets of second through holes surrounding circumferentially, each set of second through holes including multiple second sub-through holes, the multiple second sub-through holes of each set of second through holes gradually moving away from the center of the second orifice plate and gradually increasing in cross-sectional area.

[0012] In an embodiment of the present invention, each group of second through holes has multiple second sub-through holes that are arc-shaped and connected in sequence to form a serpentine through hole.

[0013] In an embodiment of the present invention, the air pipeline includes a first sub-pipeline and a plurality of second sub-pipelines. The first sub-pipeline is connected to the first premixing chamber, and the plurality of second sub-pipelines are circumferentially connected to the second premixing chamber. The axis of the second sub-pipeline is tangent to the pressure surface of the swirl blade.

[0014] In an embodiment of the present invention, the sum of the flow areas of the plurality of second sub-pipes is greater than the flow area of ​​the first sub-pipe.

[0015] In an embodiment of the present invention, the premixed noise-reducing burner further includes: a plurality of connecting pipes, wherein the gas pipeline has a plurality of first gas outlets and a plurality of second gas outlets, the plurality of first gas outlets are all connected to the first premixing chamber, the plurality of connecting pipes correspond one-to-one with the plurality of second gas outlets, and the connecting pipes are connected between the corresponding first gas outlets and the second premixing chambers; and / or, the gas pipeline is coaxially arranged with the first sub-pipeline.

[0016] In an embodiment of the present invention, the normal to the plane where the outlet of the connecting pipe is located is tangent to the pressure surface of the swirl blade.

[0017] In an embodiment of the present invention, the premixed noise-reducing burner further includes a cone-shaped body, which is disposed at the end of the gas pipeline and located in the first premixing chamber. The cross-sectional area of ​​the cone-shaped body gradually increases from the end of the cone-shaped body near the first gas outlet to the end of the cone-shaped body away from the first gas outlet.

[0018] The burner according to an embodiment of the present invention includes the premixed noise-reducing burner of the burner described above.

[0019] 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

[0020] 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:

[0021] Figure 1 This is a cross-sectional schematic diagram of a premixed noise-reducing burner according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of a premixed noise-reducing burner according to an embodiment of the present invention (shell omitted);

[0023] Figure 3 This is a schematic diagram of the first and second perforated plates according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the first through-hole group according to an embodiment of the present invention.

[0025] Figure label:

[0026] Shell 1; Receiving space 11; First premixing chamber 111; Second premixing chamber 112;

[0027] Diverter component 2;

[0028] Gas pipeline 3; First gas outlet 31; Second gas outlet 32;

[0029] Air line 4; First sub-line 41; Second sub-line 42;

[0030] 5 swirl blades;

[0031] First perforated plate 6; First through hole group 61; First sub-through hole 611;

[0032] Second perforated plate 7; Second through hole group 71; Second sub-through hole 711;

[0033] 8. Connecting pipe; 9. Conical body; 10. Divider plate;

[0034] Premixed noise-reducing burner 100. Detailed Implementation

[0035] 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.

[0036] The following is for reference. Figures 1-4 A premixed noise-reducing burner 100 and a burner having the same are described according to embodiments of the present invention.

[0037] like Figure 1 and Figure 2 As shown, the premixed noise-reducing burner 100 of the burner according to an embodiment of the present invention includes: a housing 1, a flow divider 2, a gas pipeline 3, and an air pipeline 4. The housing 1 defines a receiving space 11. The flow divider 2 is disposed in the receiving space 11 and defines a first premixed chamber 111. The flow divider 2 and the inner wall of the housing 1 together define a second premixed chamber 112. The gas pipeline 3 and the air pipeline 4 are both connected to the first premixed chamber 111 and the second premixed chamber 112. From the middle of the flow divider 2 to both ends of the flow divider 2, the cross-sectional area of ​​the flow divider 2 gradually decreases.

[0038] The premixed noise-reducing burner 100 of the burner has a housing 1 that defines a receiving space 11. A flow divider 2 of the premixed noise-reducing burner 100 is disposed within the receiving space 11. The flow divider 2 defines a first premixing chamber 111. The outer wall of the flow divider 2 and the housing 1 together define a second premixing chamber 112. The gas pipeline 3 and the air pipeline 4 of the premixed noise-reducing burner 100 are both connected to the first premixing chamber 111 and the second premixing chamber 112. The gas pipeline 3 can supply gas to the first premixing chamber 111 and the second premixing chamber 112, and the air pipeline 4 can supply air to the first premixing chamber 111 and the second premixing chamber 112, so that the gas and air can be mixed in the first premixing chamber 111 and the second premixing chamber 112 to form a combustible mixture. The premixed noise-reducing burner 100 can be connected to the burner, and the mixture can further flow into the burner and burn.

[0039] It should be noted that one of the first premixed chamber 111 and the second premixed chamber 112 can be configured as a lean combustion chamber, and the other can be configured as a rich combustion chamber. Compared to the rich combustion chamber, the ratio of fuel gas to air in the lean combustion chamber is smaller, and correspondingly, the ratio of the cross-sectional area of ​​the fuel gas inlet to the cross-sectional area of ​​the air inlet in the lean combustion chamber is smaller. This configuration can lower the combustion temperature, thereby reducing the generation of nitrogen oxides and reducing pollution from combustion exhaust gases. At the same time, it can make combustion more stable, thereby reducing noise.

[0040] From the middle to both ends of the flow divider 2, the cross-sectional area of ​​the flow divider 2 gradually decreases. In other words, the flow divider 2 can be constructed in an olive-shaped structure. This shape design can provide a larger sound-absorbing area to enhance the sound absorption effect of the premixed noise-reducing burner 100 and reduce noise.

[0041] In the above embodiments, by constructing the diverter 2 with a gradually decreasing cross-sectional area from the middle to both ends of the diverter 2, a larger sound-absorbing area can be provided by the diverter 2, thereby enhancing the sound absorption effect of the premixed noise-reducing burner 100, reducing noise, improving acoustic effects, and improving the user experience of the burner. Furthermore, by having the premixed noise-reducing burner 100 have a separated first premixing chamber 111 and a second premixing chamber 112, nitrogen oxide emissions can be reduced, thus reducing environmental pollution.

[0042] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the premixed noise reduction burner 100 also includes: multiple swirl blades 5, all of which are disposed in the second premixing chamber 112, and one end of the swirl blades 5 is serrated.

[0043] In this design, multiple swirl blades 5 of the premixed noise-reducing burner 100 can be disposed in the second premixing chamber 112. The swirl blades 5 can cause the air flowing through them to rotate. The number of swirl blades 5 can be four, six, eight, etc., and they can be evenly distributed in the second premixing chamber 112, or arranged in a circular pattern. This arrangement causes the air flowing into the second premixing chamber 112 to rotate, ensuring thorough mixing of the air and fuel gas. Furthermore, it allows the mixed gas exiting the second premixing chamber 112 to entrain the high-temperature flue gas formed after combustion, which improves combustion efficiency, reduces nitrogen oxide generation, and minimizes exhaust pollution. Additionally, one end of each swirl blade 5 can be serrated, which breaks up larger air vortices into smaller ones, thus reducing noise.

[0044] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the swirl vane 5 is disposed on the flow divider 2, and the end of the swirl vane 5 away from the air pipe 4 is constructed in a sawtooth shape, and / or the swirl vane 5 is constructed in an arc shape.

[0045] The swirl vanes 5 can be installed on the flow divider 2, and multiple swirl vanes 5 can be welded to the flow divider 2, snap-fitted to it, etc. The end of the swirl vane 5 away from the air duct 4 can be constructed in a sawtooth shape. The sawtooth-shaped swirl vane 5 can break up larger air vortices into smaller air vortices to reduce noise. By making the end of the swirl vane 5 away from the air duct 4 serrated, the placement of the sawtooth shape can be reasonable, so as to effectively break up larger air vortices into smaller air vortices and effectively reduce noise.

[0046] Alternatively, the swirl vane 5 can be constructed as an arc-shaped vane. The arc-shaped swirl vane 5 can effectively cause the air flowing through the swirl vane 5 to rotate, so that the air and fuel gas are mixed more fully, which is beneficial to improving combustion efficiency, reducing the generation of nitrogen oxides, and reducing pollution from combustion exhaust gas.

[0047] Alternatively, the end of the swirl vane 5 away from the air duct 4 can be constructed as a serrated shape and the swirl vane 5 can be constructed as an arc-shaped blade. This configuration can improve combustion efficiency, reduce the generation of nitrogen oxides, and effectively reduce noise.

[0048] In some embodiments of the present invention, such as Figure 1 , Figure 3 and Figure 4 As shown, the premixed noise reduction burner 100 also includes: a first orifice plate 6, which corresponds to the outlet end of the first premixed chamber 111. The first orifice plate 6 has multiple sets of first through holes 61, which surround the first orifice plate 6 in the circumferential direction. Each set of first through holes 61 includes multiple first sub-through holes 611. The multiple first sub-through holes 611 of each set of first through holes 61 gradually move away from the center of the first orifice plate 6 and the hole diameter gradually increases.

[0049] The first orifice plate 6 of the premixed noise reduction burner 100 can correspond to the outlet end of the first premixed chamber 111. The first orifice plate 6 can have multiple sets of first through holes 61. The number of first through holes 61 can be, but is not limited to, three, five, seven, etc. The multiple sets of first through holes 61 can surround the circumference. Each set of first through holes 61 can include multiple first sub-through holes 611 with different apertures. The number of first sub-through holes 611 in each set of first through holes 61 can be, but is not limited to, three, five, ten, etc. Along the direction gradually moving away from the center of the first orifice plate 6, the aperture of the multiple first sub-orifices 611 of each group of first through holes 61 gradually increases. The mixed gas flowing through the first sub-orifice 611 with a smaller aperture has a relatively larger flow velocity, while the mixed gas flowing through the first sub-orifice 611 with a larger aperture has a relatively smaller flow velocity. Under pressure, the mixed gas flowing through the first sub-orifice 611 with a larger aperture can flow toward the mixed gas flowing through the first sub-orifice 611 with a smaller aperture. In other words, a negative pressure backflow zone is formed at the center of the first orifice plate 6 to entrain the high-temperature flue gas formed after the mixed gas is burned, which can improve combustion stability and reduce combustion noise.

[0050] As some embodiments of this application, the first orifice plate 6 can be connected to the outlet end of the first premixed chamber 111 so that the mixed gas in the first premixed chamber 111 can flow directly out of the premixed noise reduction burner 100 through a plurality of first sub-through holes 611 of the first orifice plate 6, thereby reliably forming a negative pressure reflux zone to improve combustion stability.

[0051] In some embodiments of this application, the first perforated plate 6 and the diverter 2 can be separate components, and the first perforated plate 6 can be welded to the diverter 2, snap-fitted to it, or otherwise connected to it. In some embodiments of this application, the first perforated plate 6 can be connected to the housing 1.

[0052] As some embodiments of this application, the first orifice plate 6 can be integrally formed with the diverter 2. The integrally formed part has good structural strength, which can reduce the risk of breakage at the connection between the first orifice plate 6 and the diverter 2, improve the connection stability between the first orifice plate 6 and the diverter 2, and reduce the assembly difficulty of the premixed noise reduction burner 100.

[0053] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the centers of the multiple first sub-through holes 611 of each first through hole group 61 are arranged along a vortex line.

[0054] By arranging the centers of the multiple first sub-through holes 611 in each group of first through holes 61 along a vortex line, the arrangement of the multiple first sub-through holes 611 in each group of first through holes 61 can be made more reasonable. This allows for a better formation of a negative pressure recirculation zone at the center of the first orifice plate 6, which better entrains the high-temperature flue gas formed after the combustion of the mixed gas, greatly improving combustion stability and more effectively reducing noise. Furthermore, this arrangement increases the number of first sub-through holes 611 in each group of first through holes 61, thereby increasing the gas throughput of the first orifice plate 6, improving the mixing efficiency of the premixed noise-reducing burner 100, and simultaneously reducing the impact area between the mixed gas and the first orifice plate 6, thus reducing airflow impact and noise caused by impact.

[0055] In some embodiments of the present invention, such as Figures 1-3 As shown, the premixed noise reduction burner 100 also includes: a second orifice plate 7, which corresponds to the outlet end of the second premixed chamber 112. The second orifice plate 7 has multiple sets of second through holes 71, which surround the second orifice plate 7 in the circumferential direction. Each set of second through holes 71 includes multiple second sub-through holes 711. The multiple second sub-through holes 711 of each set of second through holes 71 gradually move away from the center of the second orifice plate 7 and their cross-sectional area gradually increases.

[0056] The second orifice plate 7 of the premixed noise reduction burner 100 can correspond to the outlet end of the second premixed chamber 112. The second orifice plate 7 can have multiple sets of second through holes 71. The number of second through hole sets 71 can be, but is not limited to, two, three, four, etc. The multiple sets of second through hole sets 71 can be arranged around the circumference. Each set of second through hole sets 71 can include multiple second sub-through holes 711 with different cross-sectional areas. The number of second sub-through holes 711 in each set of second through hole sets 71 can be, but is not limited to, three, four, five, etc. The multiple second sub-through holes 711 in each set of second through hole sets 71 can be arranged at intervals to reduce airflow impact.

[0057] Along the direction that gradually moves away from the center of the second orifice plate 7, the cross-sectional area of ​​the multiple second sub-through holes 711 in each group of second through holes 71 gradually increases. The multiple second sub-through holes 711 on the second orifice plate 7 are spaced apart from each other so that the mixed gas can be injected into the combustion chamber of the burner at intervals, thereby slowing down the combustion speed of the mixed gas, reducing the local pressure rise rate, and thus reducing combustion noise.

[0058] As some embodiments of this application, the second orifice plate 7 can be connected to the outlet end of the second premixed chamber 112 so that the mixed gas in the second premixed chamber 112 can flow directly out of the premixed noise reduction burner 100 through a plurality of second sub-through holes 711 of the second orifice plate 7, thereby effectively reducing the local pressure rise rate and reducing combustion noise.

[0059] In some embodiments of the present invention, such as Figure 2and Figure 3 As shown, each group of second through holes 71 has multiple second sub-through holes 711 that are arc-shaped and connected in sequence to form a serpentine through hole.

[0060] In this design, each of the multiple second sub-through holes 711 in each group of second through holes 71 can be an arc-shaped hole, and the multiple second sub-through holes 711 in each group of second through holes 71 can be connected in sequence to form a serpentine through hole. This arrangement can increase the surface area of ​​the second through hole plate 7, thereby increasing the propagation path of sound waves and reducing noise.

[0061] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the air duct 4 includes a first sub-duct 41 and a plurality of second sub-ducts 42. The first sub-duct 41 is connected to the first premixing chamber 111. The plurality of second sub-ducts 42 are circumferentially connected to the second premixing chamber 112. The axis of the second sub-duct 42 is tangent to the pressure surface of the swirl vane 5.

[0062] The air duct 4 has a first sub-duct 41 that can connect to the first premixing chamber 111 and can supply air to the first premixing chamber 111. The air duct 4 has multiple second sub-ducts 42, such as two, four, or six. These multiple second sub-ducts 42 can circumferentially surround the first premixing chamber 112 and can all connect to it, supplying air to it. The sum of the flow areas of the multiple second sub-ducts 42 is equal to that of the first premixing chamber 111. The flow area of ​​the sub-pipe 41 can be different so that the amount of air flowing into the first premixed chamber 111 and the second premixed chamber 112 is different. Thus, one of the first premixed chamber 111 and the second premixed chamber 112 can be set as a lean combustion chamber, and the other of the first premixed chamber 111 and the second premixed chamber 112 can be set as a rich combustion chamber. This setting can reduce the periodic oscillation amplitude of pressure and temperature caused by unstable airflow mixing, injection and combustion, so as to reduce noise, and can also reduce the combustion temperature, so as to reduce the generation of nitrogen oxides and reduce exhaust pollution.

[0063] In addition, the pressure surface of the swirl vane 5 is the side that bears the gas pressure, and the pressure surface faces the second sub-pipe 42. The axis of the second sub-pipe 42 can be tangent to the pressure surface of the swirl vane 5. This arrangement can reduce the noise caused by air impacting the swirl vane 5, and can also improve the effect of making the air rotate by setting the swirl vane 5.

[0064] As some embodiments of this application, such as Figure 1 and Figure 2 As shown, the premixed noise-reducing burner 100 also includes a partition plate 10.

[0065] The partition plate 10 can be disposed in the accommodating space 11. The partition plate 10, the housing 1 and the diverter 2 can jointly define the second premixing chamber 112. The first sub-pipe 41 and multiple second sub-pipes 42 can be fixedly connected to the partition plate 10 to make the connection structure of the premixed noise reduction burner 100 more reasonable and to enhance the structural strength of the premixed noise reduction burner 100.

[0066] As some embodiments of this application, the partition plate 10 may have a number of connecting holes, and the number of connecting holes may be multiple. The multiple connecting holes may correspond one-to-one with multiple second sub-pipes 42. Each second sub-pipe 42 may be connected to the second premixing chamber 112 through the corresponding connecting hole. This arrangement can make the structure of the partition plate 10 more reasonable, which can both cover the second premixing chamber 112 and allow air to enter the second premixing chamber 112 through the partition plate 10.

[0067] In some embodiments of the present invention, such as Figure 2 As shown, the sum of the flow areas of the multiple second sub-pipes 42 is greater than the flow area of ​​the first sub-pipe 41.

[0068] Specifically, the sum of the flow areas of multiple second sub-pipes 42 can be set to be greater than the flow area of ​​the first sub-pipe 41, so that the amount of air flowing into the second premixed chamber 112 is greater than the amount of air flowing into the first premixed chamber 111. Furthermore, the amount of fuel gas flowing into the first premixed chamber 111 and the second premixed chamber 112 can be made approximately the same, so that the first premixed chamber 111 is constructed as a fuel-rich chamber and the second premixed chamber 112 is constructed as a fuel-lean chamber. This configuration can reduce the periodic oscillations of pressure and temperature caused by airflow mixing, injection, and combustion instability, thereby reducing noise, and can also lower the combustion temperature, thereby reducing the generation of nitrogen oxides and reducing exhaust gas pollution.

[0069] As a specific embodiment of this application, the first premixed chamber 111 can be a fuel-rich chamber, and the equivalence ratio (gas to air ratio) of the first premixed chamber 111 can be 1.2. The second premixed chamber 112 can be a lean chamber, and the equivalence ratio (gas to air ratio) of the second premixed chamber 112 can be 0.8. By adopting a staged combustion mode with the combined effects of fuel-rich and lean combustion, the periodic oscillations of pressure and temperature caused by airflow mixing, injection, and combustion instability can be reduced to reduce noise. At the same time, the combustion temperature can be lowered to reduce the generation of nitrogen oxides and reduce exhaust gas pollution.

[0070] In some embodiments of the present invention, such as Figure 1As shown, the premixed noise reduction burner 100 also includes: multiple connecting pipes 8, the gas pipeline 3 has multiple first gas outlets 31 and multiple second gas outlets 32, the multiple first gas outlets 31 are all connected to the first premixing chamber 111, the multiple connecting pipes 8 correspond one-to-one with the multiple second gas outlets 32, the connecting pipes 8 are connected between the corresponding first gas outlets 31 and the second premixing chamber 112, and / or, the gas pipeline 3 and the first sub-pipeline 41 are arranged coaxially.

[0071] The number of first gas outlets 31 in the gas pipeline 3 can be, but is not limited to, two, four, or six. Multiple first gas outlets 31 can be connected to the first premixing chamber 111, allowing gas in the gas pipeline 3 to flow into the first premixing chamber 111 through these outlets. Similarly, the number of second gas outlets 32 in the gas pipeline 3 can be, but is not limited to, two, four, or six. The connecting pipe 8 of the premixed noise-reducing burner 100 can connect between the corresponding first gas outlet 31 and the second premixing chamber 112. In other words, each second gas outlet 32 ​​can be connected to... Each corresponding connecting pipe 8 is connected to the second premixed chamber 112. The gas in the gas pipeline 3 can flow into the multiple connecting pipes 8 through multiple second gas outlets 32, and then into the second premixed chamber 112 through the multiple connecting pipes 8. This arrangement can achieve the purpose of distributing gas to the first premixed chamber 111 and the second premixed chamber 112, so that both the first premixed chamber 111 and the second premixed chamber 112 can mix gas and air. Moreover, gas can be distributed to the first premixed chamber 111 and the second premixed chamber 112 simultaneously through only one gas pipeline 3. The structural design is ingenious.

[0072] In addition, both the gas pipeline 3 and the first sub-pipeline 41 can be constructed as cylindrical pipelines. The gas pipeline 3 and the first sub-pipeline 41 can be arranged coaxially. This arrangement can reduce the processing difficulty of the premixed noise reduction burner 100, make the premixed noise reduction burner 100 compact and reasonable in structure, and improve the space utilization of the premixed noise reduction burner 100.

[0073] As some embodiments of this application, the number of first gas outlets 31 and second gas outlets 32 and the pipeline flow area can be the same. In this way, by designing the flow area of ​​the first sub-pipeline 41 and the second sub-pipeline 42, the first premixed chamber 111 can be constructed as a fuel-rich chamber and the second premixed chamber 112 can be constructed as a fuel-lean chamber, which can reduce the difficulty of designing the gas pipeline 3.

[0074] In some embodiments of the present invention, the normal to the plane where the outlet of the connecting pipe 8 is located is tangent to the pressure surface of the swirl blade 5.

[0075] This configuration reduces noise caused by air impacting the swirl vanes 5. Furthermore, it allows the flow direction of the gas flowing into the second premixing chamber 112 to be approximately the same as the flow direction of the rotating air flowing into the second premixing chamber 112, thereby reducing noise caused by gas impact and further improving the noise reduction effect of the premixed noise-reducing burner 100. In addition, it allows the air and gas to be fully mixed.

[0076] In some embodiments of the present invention, such as Figure 1 As shown, the premixed noise reduction burner 100 also includes a cone 9, which is disposed at the end of the gas pipeline 3 and located in the first premixing chamber 111. The cross-sectional area of ​​the cone 9 gradually increases from the end of the cone 9 near the first gas outlet 31 to the end away from the first gas outlet 31.

[0077] The cone 9 of the premixed noise-reducing burner 100 can be located within the first premixing chamber 111, and can be positioned at the end of the gas pipeline 3. The cone 9 can be constructed as a closed structure to seal the end of the gas pipeline 3, allowing the gas in the gas pipeline 3 to flow to the first gas outlet 31 and the second gas outlet 32. From the end of the cone 9 closest to the first gas outlet 31 to the end furthest from the first gas outlet 31, the cross-sectional area of ​​the cone 9 can gradually increase to reduce the flow area of ​​the mixed gas at the cone 9, thereby increasing the flow rate of the mixed gas. Furthermore, a reflux zone can be formed, which is beneficial for further thorough mixing of air and gas, and for more stable combustion of the subsequent mixed gas.

[0078] The premixed noise-reducing burner 100 proposed in this application has great flexibility in use and can be applied to different premixed combustion gas boilers, with high reliability in use.

[0079] The burner according to an embodiment of the present invention includes the premixed noise-reducing burner 100 described above. By configuring the flow divider 2 such that its cross-sectional area gradually decreases from the middle to both ends of the flow divider 2, a larger sound-absorbing area can be provided by the flow divider 2, thereby enhancing the sound absorption effect of the premixed noise-reducing burner 100, reducing noise, improving acoustic performance, and improving the user experience of the burner. Furthermore, by having the premixed noise-reducing burner 100 have a separated first premixing chamber 111 and a second premixing chamber 112, nitrogen oxide emissions can be reduced, thus reducing environmental pollution.

[0080] 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.

[0081] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0082] In the description of this invention, "a plurality of" means two or more.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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) for a burner, characterized in that, include: The housing (1) and the diverter (2) define a receiving space (11), the diverter (2) is disposed in the receiving space (11) and defines a first premixing chamber (111), and the diverter (2) and the inner wall of the housing (1) together define a second premixing chamber (112); Gas pipeline (3) and air pipeline (4), both of which are connected to the first premixed chamber (111) and the second premixed chamber (112); From the middle of the diverter (2) to both ends of the diverter (2), the cross-sectional area of ​​the diverter (2) gradually decreases.

2. The premixed noise-reducing burner (100) of the burner according to claim 1, characterized in that, Also includes: Multiple swirl blades (5) are provided in the second premixing chamber (112), and one end of each swirl blade (5) is serrated.

3. The premixed noise-reducing burner (100) of the burner according to claim 2, characterized in that, The swirl vane (5) is disposed on the flow divider (2), and the end of the swirl vane (5) away from the air duct (4) is constructed in a sawtooth shape; And / or, the swirl blade (5) is constructed as an arc-shaped blade.

4. The premixed noise-reducing burner (100) of the burner according to claim 1, characterized in that, Also includes: The first orifice plate (6) corresponds to the outlet end of the first premix chamber (111). The first orifice plate (6) has multiple sets of first through holes (61). The multiple sets of first through holes (61) surround the circumference. Each set of first through holes (61) includes multiple first sub-through holes (611). The multiple first sub-through holes (611) of each set of first through holes (61) gradually move away from the center of the first orifice plate (6) and the hole diameter gradually increases.

5. The premixed noise-reducing burner (100) of the burner according to claim 4, characterized in that, The centers of the plurality of first sub-through holes (611) of each first through hole group (61) are arranged along a vortex line.

6. The premixed noise-reducing burner (100) of the burner according to claim 1, characterized in that, Also includes: The second orifice plate (7) corresponds to the outlet end of the second premix chamber (112). The second orifice plate (7) has multiple sets of second through holes (71). The multiple sets of second through holes (71) surround the circumference. Each set of second through holes (71) includes multiple second sub-through holes (711). The multiple second sub-through holes (711) of each set of second through holes (71) gradually move away from the center of the second orifice plate (7) and the cross-sectional area gradually increases.

7. The premixed noise-reducing burner (100) of the burner according to claim 6, characterized in that, Each of the second sub-through holes (711) of the second through hole group (71) is an arc-shaped hole and is connected in sequence to form a serpentine through hole.

8. The premixed noise-reducing burner (100) of the burner according to claim 2 or 3, characterized in that, The air duct (4) includes a first sub-duct (41) and a plurality of second sub-ducts (42). The first sub-duct (41) is connected to the first premix chamber (111). The plurality of second sub-ducts (42) are circumferentially connected to the second premix chamber (112). The axis of the second sub-duct (42) is tangent to the pressure surface of the swirl vane (5).

9. The premixed noise-reducing burner (100) of the burner according to claim 8, characterized in that, The sum of the flow areas of the multiple second sub-pipes (42) is greater than the flow area of ​​the first sub-pipe (41).

10. The premixed noise-reducing burner (100) of the burner according to claim 8, characterized in that, Also includes: Multiple connecting pipes (8), the gas pipeline (3) has multiple first gas outlets (31) and multiple second gas outlets (32), the multiple first gas outlets (31) are all connected to the first premixed chamber (111), the multiple connecting pipes (8) correspond one-to-one with the multiple second gas outlets (32), the connecting pipes (8) are connected between the corresponding first gas outlets (31) and the second premixed chambers (112); And / or, the gas pipeline (3) is arranged coaxially with the first sub-pipeline (41).

11. The premixed noise-reducing burner (100) of the burner according to claim 10, characterized in that, The normal to the plane where the outlet of the connecting pipe (8) is located is tangent to the pressure surface of the swirl blade (5).

12. The premixed noise-reducing burner (100) of the burner according to claim 10, characterized in that, Also includes: A cone (9) is provided at the end of the gas pipeline (3) and located in the first premixing chamber (111). The cross-sectional area of ​​the cone (9) gradually increases from the end of the cone (9) near the first gas outlet (31) to the end away from the first gas outlet (31).

13. A burner, characterized in that, Includes a premixed noise-reducing burner (100) for the burner according to any one of claims 1-12.

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