Combustor and water heater

Abstract

The application discloses a burner and a water heater, and relates to the technical field of water heaters. The burner comprises a fire grate with an air inlet channel, and an air inlet is arranged at an air inlet end of the air inlet channel. The injection device is provided with a jet flow part corresponding to the air inlet channel, the jet flow part is at least partially inserted into the air inlet channel from the air inlet, the jet flow part is provided with a gas inlet and a jet flow hole, the gas inlet is communicated with the air inlet channel through the jet flow hole, and the jet flow direction of the jet flow hole is obliquely intersected with the gas conveying direction of the air inlet channel. The application prolongs the residence time of the gas in the air inlet channel, improves the fullness degree of the gas in the air inlet channel, enhances the mixing uniformity of the gas and the air in the fire grate, reduces the chemical equivalent ratio of the gas at the fire grate outlet, effectively avoids the local high temperature phenomenon, and further reduces the flue gas emission of pollutants such as CO and NOx.

Description

Technical Field

[0001] This invention relates to the field of water heater technology, and in particular to a burner and a water heater. Background Technology

[0002] In traditional gas water heaters, gas and air flow in the same direction in the burner, resulting in insufficient mixing between the two inside the burner. This leads to uneven distribution of combustion equivalence at the burner outlet, poor flame uniformity, and mediocre emission performance. Summary of the Invention

[0003] The main objective of this invention is to provide a burner and water heater that enhances the uniformity of gas and air mixing within the burner, reduces the chemical stoichiometry of gas at the burner outlet, effectively avoids localized high-temperature phenomena, and thereby reduces the emission of pollutants such as CO and NOx.

[0004] To achieve the above objectives, the present invention provides a burner comprising:

[0005] A burner, having an air intake channel, wherein the air intake end of the air intake channel is provided with an air inlet; and

[0006] An ejector device has a jet section corresponding to the air intake channel. The jet section extends at least partially into the air intake channel from the air inlet. The jet section has a gas inlet and a jet hole. The gas inlet communicates with the air intake channel through the jet hole. The jet direction of the jet hole intersects the gas delivery direction of the air intake channel at an angle.

[0007] In one embodiment, the jet section has an end wall opposite to the air inlet, the end wall being located within the air intake channel, and the jet hole includes a first jet hole disposed on the end wall, the first jet hole extending obliquely along the jet direction toward a side close to the central axis of the air intake channel;

[0008] And / or, the jet section has a peripheral wall opposite to the peripheral surface of the air inlet channel, and the jet hole includes a second jet hole provided on the peripheral wall, the second jet hole extending obliquely along the jet direction toward a side away from the central axis of the air inlet channel.

[0009] In one embodiment, the end wall has a first end face and a second end face that are axially opposite to each other along the jet portion, the first end face and / or the second end face being a tapered surface that expands toward the side away from the air inlet.

[0010] In one embodiment, a first jet angle is formed between the jet direction of the first jet hole and the gas delivery direction of the inlet channel, and a second jet angle is formed between the jet direction of the second jet hole and the gas delivery direction of the inlet channel, wherein the first jet angle and / or the second jet angle are not less than 5 degrees and not greater than 15 degrees.

[0011] In one embodiment, the first jet angle is greater than the second jet angle.

[0012] In one embodiment, a plurality of first jet holes are provided, and the plurality of first jet holes are arranged at intervals along the circumference of the jet section on the end wall;

[0013] And / or, the second jet hole is provided in a plurality of them, and the plurality of the second jet holes are arranged at intervals along the circumference of the jet portion on the peripheral wall.

[0014] In one embodiment, a plurality of second jet holes are provided, and the plurality of second jet holes are equidistantly spaced along the circumference of the jet section;

[0015] The projections of the central axes of the plurality of second jet holes onto a reference plane perpendicular to the gas delivery direction of the inlet air passage lie on the same circumference.

[0016] In one embodiment, the fire bar is provided with a plurality of air intake channels, and a plurality of jet sections are provided. The plurality of jet sections are arranged in a one-to-one correspondence with the plurality of air intake channels, and each jet section is provided with a plurality of first jet holes and / or a plurality of second jet holes.

[0017] In one embodiment, multiple fire bars are provided, and the ejector device is provided with the jet section in the air intake channel of each fire bar.

[0018] In one embodiment, the ejector device further includes a gas distribution section, which has a gas distribution channel. The gas distribution channel has a gas inlet at its inlet end and an exhaust end connected to the gas inlet of each of the ejector sections.

[0019] In one embodiment, the gas distribution channel includes a first flow section and a plurality of second flow sections. The first flow section is provided with the gas inlet. The first flow section is connected to the plurality of second flow sections respectively. The plurality of second flow sections are arranged opposite to each other along a first direction. Each second flow section has a plurality of branch outlets.

[0020] Each of the second flow sections has a plurality of jet sections arranged at intervals along the second direction on its surface, and the gas inlets of the plurality of jet sections are connected one-to-one with the plurality of branch ports;

[0021] The plurality of fire bars are arranged at intervals along a second direction, which intersects with the first direction.

[0022] In one embodiment, an airflow channel is defined between the outer peripheral wall of the jet section and the edge of the air inlet, the airflow channel being used to draw air into the air inlet channel.

[0023] The present invention also proposes a water heater, including the burner described above.

[0024] The technical solution of the present invention extends at least partially from the air inlet into the air intake channel of the burner, and makes the jet direction of the jet hole intersect the gas delivery direction of the air intake channel at an angle. This makes the distribution of gas in the air intake channel more uniform and extends the residence time, thereby improving the mixing degree of gas and air, reducing the fluctuation of combustion equivalence ratio at the burner outlet, improving flame uniformity, and helping to reduce the emission levels of pollutants such as CO and NOx. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the burner provided by the present invention;

[0027] Figure 2 Cross-sectional view of the burner provided by the present invention Figure 1 ;

[0028] Figure 3 Cross-sectional view of the burner provided by the present invention Figure 2 ;

[0029] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0030] Figure 5 This is a schematic diagram of the ejector device provided by the present invention;

[0031] Figure 6 A cross-sectional view of the ejector device provided by the present invention.

[0032] Explanation of icon numbers:

[0033] 100. Burner; 10. Flame rack; 11. Flame rack body; 101. Air intake channel; 102. Air inlet; 103. Air flow channel; 12. Combustion head; 121. Flame distribution plate; 1211. First plate surface; 122. Metal mesh; 1201. Flame hole; 20. Injector device; 21. Jet section; 2101. Gas inlet; 2102. Jet hole; 21021. First jet hole; 21022. Second jet hole; 211. End wall ; 2111, First end face; 2112, Second end face; 212, Peripheral wall; 22, Gas distribution section; 2201, Gas distribution channel; 22011, First flow section; 22012, Second flow section; 2202, Gas inlet; 2203, Diversion port; L, Gas delivery direction of the inlet channel / Central axis of the inlet channel; L1, Jet direction of the first jet hole; L2, Jet direction of the second jet hole; α, First jet angle; β, Second jet angle.

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] In traditional gas water heaters, gas and air flow in the same direction in the burner, resulting in insufficient mixing between the two inside the burner. This leads to uneven distribution of combustion equivalence at the burner outlet, poor flame uniformity, and mediocre emission performance.

[0037] The present invention proposes a burner 100.

[0038] Please see Figures 1 to 4 In one embodiment of the present invention, the burner 100 includes a burner 10 and an ejector device 20. The burner 10 has an air intake channel 101, and the air intake end of the air intake channel 101 is provided with an air inlet 102; the ejector device 20 has a jet section 21 corresponding to the air intake channel 101, the jet section 21 extending at least partially into the air intake channel 101 from the air inlet 102, the jet section 21 has a gas inlet 2101 and a jet hole 2102, the gas inlet 2101 communicates with the air intake channel 101 through the jet hole 2102, and the jet direction of the jet hole 2102 is obliquely intersecting the gas delivery direction of the air intake channel 101.

[0039] The burner 10 constitutes the main structure of the burner 100, including a burner body 11. The burner body 11 is hollow, forming an air intake channel 101 and an air inlet 102. For ease of manufacturing, the burner body 11 can be made of two sheet metal parts joined together and fixed by welding or riveting to improve the sealing reliability of the air intake channel 101. The air inlet 102 can be located on one side of the burner body 11 in the height direction so as to communicate with the jet section 21 of the ejector device 20.

[0040] In addition, the exhaust end of the intake duct 101 is provided with a gas head, and the gas head is provided with a flame hole 1201 communicating with the intake duct 101. Multiple flame holes 1201 can be provided, and these multiple flame holes 1201 can be arranged at intervals along the length of the burner 10. The air inlet 102 of the burner 10 is connected to multiple flame holes 1201 via the intake duct 101. The air inlet 102 is used to supply air and gas to the intake duct 101, and the gas is supplied to the flame hole 1201 via the intake duct 101 to ignite and produce a combustion flame. In practical applications, the jet section 21 of the ejector device 20 can be used to inject gas into the air inlet 102 to allow the gas to enter the intake duct 101. Simultaneously, external air can also enter the intake duct 101 through the air inlet 102 via self-priming or forced draft.

[0041] Understandably, the flow direction of the combustion gas and air in the intake channel 101 is the same, making it difficult to form strong turbulence. This results in uneven mixing of the combustion gas and air within the intake channel 101, thus affecting the stability of the combustion process. Because the combustion gas and air are not sufficiently premixed within the intake channel 101, local areas may experience excessively high or low combustion gas concentrations. This leads to differences in the ratio of combustion gas to air participating in the combustion reaction at each burner hole 1201, i.e., uneven distribution of the stoichiometric ratio. The stoichiometric ratio refers to the ratio between the actual molar ratio of combustion gas to air participating in combustion and the stoichiometric ratio required for theoretical complete combustion. Uneven distribution of this ratio directly causes inconsistencies in the flame temperature field. Some areas are rich in fuel and therefore have higher temperatures, while other areas are lean and therefore have incomplete combustion. This manifests as poor flame uniformity, accompanied by increased emissions of pollutants such as carbon monoxide and nitrogen oxides.

[0042] In order to improve the uniformity of the mixing of fuel gas and air in the intake air passage 101 and increase the primary air coefficient, the technical solution of the present invention extends at least part of the jet part 21 of the ejector device 20 into the intake air passage 101 from the air inlet 102, that is, a part of the jet part 21 extends into the intake air passage 101, or it can extend completely into the intake air passage 101. The jet section 21 has a gas inlet 2101 and a jet hole 2102. The gas inlet 2101 is connected to the intake channel 101 through the jet hole 2102. In this way, after the jet section 21 extends into the interior of the intake channel 101, its position is closer to the central region of the intake channel 101, so that the gas introduced from the gas inlet 2101 can be transferred to the jet hole 2102. The gas ejected through the jet hole 2102 can directly act on the air flow field in the intake channel 101, avoiding the gas from adhering to or passing quickly along the inner wall of the burner 10 when it first enters the intake channel 101. This improves the spatial distribution and time retention effect of the gas on the cross-section of the intake channel 101, providing more favorable initial conditions for subsequent mixing with air.

[0043] Furthermore, the jet direction of the jet orifice 2102 is inclined to intersect the gas delivery direction of the inlet channel 101. Thus, the gas ejected from the jet orifice 2102 no longer propels directly along the axial direction of the inlet channel 101, but impacts the mainstream airflow in the inlet channel 101 at a non-parallel angle. This induces vortices or shear flows in the local area where the gas ejected from the jet orifice 2102 meets the air in the inlet channel 101, enhancing the momentum exchange and diffusion between the gas and the air, prolonging the effective residence time of the gas in the inlet channel 101, and improving the uniformity of gas distribution on the cross-section of the inlet channel 101, which helps to achieve a more thorough premixing effect.

[0044] The jet direction of the jet orifice 2102 is inclined to intersect the gas delivery direction of the inlet channel 101. That is, the angle formed between the jet direction of the jet orifice 2102 and the gas delivery direction of the inlet channel 101 cannot be 0 degrees or 180 degrees. This indicates that the path of the gas ejected by the jet section 21 is not parallel to the path of the air flow introduced by the air inlet 102 in the inlet channel 101. This can effectively break the laminar flow state caused by the original unidirectional flow, promote turbulent mixing, and thus improve the mixing quality of gas and air before combustion.

[0045] The technical solution of the present invention extends at least partially from the air inlet 102 into the air intake channel 101 of the burner 10 by extending the jet section 21 of the ejector device 20 into the air intake channel 101 of the burner 10, and makes the jet direction of the jet hole 2102 intersect the gas delivery direction of the air intake channel 101 at an angle, so that the distribution of the gas in the air intake channel 101 is more uniform and the residence time is extended, thereby improving the mixing degree of gas and air, reducing the fluctuation of the combustion equivalence ratio at the outlet of the burner 10, improving the flame uniformity, and helping to reduce the emission levels of pollutants such as CO and NOx.

[0046] To improve the uniformity of gas and air mixing within the intake duct 101, such as Figures 2 to 4 As shown, in one embodiment, the jet section 21 has an end wall 211 opposite to the air inlet 102. The end wall 211 is located inside the air inlet channel 101. The jet hole 2102 includes a first jet hole 21021 provided on the end wall 211. The first jet hole 21021 extends obliquely along the jet direction toward the side close to the central axis of the air inlet channel 101.

[0047] In this embodiment, the gas jet path formed by the first jet hole 21021 does not extend in a straight line along the axial direction of the intake channel 101, but is inclined to extend towards the side closer to the central axis of the intake channel 101 along the jet direction. This allows the gas ejected from the first jet hole 21021 to act more effectively on the central region of the cross-section of the intake channel 101, avoiding the gas from concentrating and adhering to the inner wall of the burner 10 or passing quickly along the edge. This enhances the spatial distribution of the gas in the intake channel 101 and creates local disturbances in the mainstream airflow field, which helps to promote momentum exchange and diffusion mixing between the gas and the air.

[0048] like Figures 2 to 4 As shown, in one embodiment, the jet section 21 has a peripheral wall 212 opposite to the peripheral surface of the inlet channel 101, and the jet hole 2102 includes a second jet hole 21022 provided on the peripheral wall 212. The second jet hole 21022 extends obliquely along the jet direction toward the side away from the central axis L of the inlet channel 101.

[0049] In this embodiment, the peripheral wall 212 of the jet section 21 is arranged facing the inner peripheral surface of the air intake channel 101. The gas jet path formed by the second jet hole 21022 opened on it does not point to the center of the air intake channel 101, but extends obliquely towards the inner wall of the burner 10. This allows the gas ejected from the second jet hole 21022 to act on the area of ​​the air intake channel 101 near the inner peripheral surface, thereby supplementing the gas supply to this area, improving the problem of insufficient mixing caused by the low mainstream air velocity or slow flow in this area, and forming a spatially complementary distribution pattern with the gas ejected from the first jet hole 21021 of the end wall 211, further improving the uniformity of gas coverage across the entire cross-section of the air intake channel 101.

[0050] like Figures 2 to 4 As shown, in one embodiment, the end wall 211 has a first end face 2111 and a second end face 2112 that are axially opposite to each other along the jet portion 21, and the first end face 2111 and / or the second end face 2112 are provided with tapered surfaces that expand toward the side away from the air inlet 102.

[0051] In this embodiment, the first end face 2111 and / or the second end face 2112 of the end wall 211 have a conical or inclined structure, which extends radially outward from the central axis of the jet section 21 and gradually slopes away from the air inlet 102, so that the end wall 211 as a whole has an outwardly expanding geometry while extending axially. This structure helps to guide the gas ejected from the first jet hole 21021 to diffuse more evenly into the cross-sectional area of ​​the air intake channel 101, while reducing the local accumulation of gas near the end wall 211 due to flow stagnation. In combination with the inclined arrangement of the first jet hole 21021, the spatial distribution and mixing characteristics of the gas in the air intake channel 101 are further optimized.

[0052] like Figures 2 to 4 As shown, in one embodiment, a first jet angle α is formed between the jet direction L1 of the first jet hole 21021 and the gas delivery direction L of the inlet channel 101, and a second jet angle β is formed between the jet direction L2 of the second jet hole 21022 and the gas delivery direction L of the inlet channel 101. The first jet angle α and / or the second jet angle β are not less than 5 degrees and not greater than 15 degrees.

[0053] In this embodiment, the angle between the gas jet formed by the first jet hole 21021 and the mainstream airflow direction within the inlet channel 101 is the first jet angle α, and the angle between the gas jet formed by the second jet hole 21022 and the mainstream airflow direction within the inlet channel 101 is the second jet angle β. The values ​​of the first jet angle α and / or the second jet angle β are limited to between 5 degrees and 15 degrees, so that the gas ejected from the first jet hole 21021 and the second jet hole 21022 avoids both complete homology with the mainstream airflow, making it difficult to mix, and avoids excessive dissipation of gas kinetic energy or backflow due to excessively large angles. Within this angle range, the gas jet can cut into the mainstream airflow field at a moderate angle, inducing shear effects and micro-scale vortices in local areas, thereby promoting effective mixing of gas and air while maintaining high flow efficiency.

[0054] The first jet angle α and / or the second jet angle β are not less than 5 degrees, which allows the gas jet to have sufficient deflection relative to the mainstream airflow direction within the inlet channel 101, helping to break the laminar flow state and generate local disturbances, thereby improving the mixing intensity. The first jet angle α and / or the second jet angle β are not greater than 15 degrees, which allows the gas jet to maintain a relatively smooth flow trajectory when it enters the mainstream airflow field, reducing flow separation or energy loss caused by sharp turning, and helping to maintain a stable premixing process. For example, the first jet angle α and / or the second jet angle β can be any angle among 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees, and 15 degrees.

[0055] like Figures 2 to 4 As shown, in one embodiment, the first jet angle α is greater than the second jet angle β.

[0056] In this embodiment, the first jet angle α is 11 degrees and the second jet angle β is 8 degrees. By limiting the angle between the jet direction of the first jet hole 21021 and the gas delivery direction of the inlet channel 101 to 11 degrees and the angle between the jet direction of the second jet hole 21022 and the gas delivery direction of the inlet channel 101 to 8 degrees, the gas ejected from the first jet hole 21021 has a larger deflection angle relative to the mainstream air, thereby acting more effectively on the central region of the inlet channel 101 and enhancing the turbulent mixing in that region; while the second jet hole 21022 injects gas at a relatively smaller angle of 8 degrees, which focuses more on directional supplementary gas supply to the region near the inner circumferential surface of the inlet channel 101, while maintaining low flow resistance and kinetic energy loss. The differentiated setting of the two angles helps to form a gradient jet distribution on the cross-section of the inlet channel 101, synergistically improving the overall premixing uniformity and combustion stability.

[0057] like Figure 5As shown, in one embodiment, a plurality of first jet holes 21021 are provided, and the plurality of first jet holes 21021 are arranged at intervals along the circumference of the jet section 21 on the end wall 211.

[0058] In this embodiment, multiple first jet holes 21021 are circumferentially distributed on the end wall 211, maintaining a certain interval between them. This allows the gas ejected from each first jet hole 21021 to form a surrounding or radial multi-point jet layout in the central region of the cross-section of the inlet channel 101. This arrangement helps to improve the spatial coverage of the gas in the central region of the inlet channel 101, avoids excessively high local concentrations or mixing blind zones caused by a single jet, thereby enhancing the mixing uniformity of the gas and mainstream air in the central region and providing a more consistent component distribution for the premixed gas subsequently delivered to the flame hole 1201.

[0059] like Figure 5 As shown, in one embodiment, a plurality of second jet holes 21022 are provided, and the plurality of second jet holes 21022 are arranged at intervals along the circumferential direction of the jet portion 21 on the peripheral wall 212.

[0060] In this embodiment, a plurality of second jet holes 21022 are arranged at uniform or non-uniform intervals along the circumferential direction on the peripheral wall 212 of the jet section 21, so that the gas ejected from each second jet hole 21022 can cover multiple directional areas of the inner peripheral surface of the intake channel 101. This arrangement helps to form a multi-point gas supply effect in the annular area near the inner peripheral surface of the intake channel 101, improves the problem of insufficient mixing caused by the low mainstream air velocity or poor flow in this area, and works in synergy with the first jet holes 21021 provided on the end wall 211 to jointly improve the uniformity of gas distribution and premixing efficiency across the entire cross-section of the intake channel 101.

[0061] like Figure 5 As shown, in one embodiment, a plurality of second jet holes 21022 are provided, and the plurality of second jet holes 21022 are equidistantly spaced along the circumference of the jet section 21; the projections of the central axes of the plurality of second jet holes 21022 onto a reference plane perpendicular to the gas delivery direction of the inlet channel 101 are located on the same circumference.

[0062] In this embodiment, multiple second jet holes 21022 are distributed at equal circumferential intervals on the peripheral wall 212 of the jet section 21, and the projections of the central axes of each second jet hole 21022 onto a reference plane perpendicular to the gas delivery direction of the inlet channel 101 lie on the same circumference, giving each second jet hole 21022 rotational symmetry in spatial arrangement. This structure helps to achieve uniform circumferential supply of gas along the inner circumferential region of the inlet channel 101, avoiding excessive or insufficient local gas supply, thereby maintaining overall flow stability while improving the mixing consistency of gas and air in the near-inner circumferential region, and providing a more balanced composition basis for the delivery of premixed gas to the flame hole 1201.

[0063] like Figures 2 to 5 As shown, in one embodiment, the fire duct 10 is provided with a plurality of air intake channels 101 and a plurality of jet sections 21 are provided. The plurality of jet sections 21 are configured in a one-to-one correspondence with the plurality of air intake channels 101. Each jet section 21 is provided with a plurality of first jet holes 21021 and / or a plurality of second jet holes 21022.

[0064] In this embodiment, the burner 10 is internally configured with multiple independent air intake channels 101. Each air intake channel 101 is correspondingly provided with a jet section 21, which at least partially extends into the corresponding air intake channel 101. Multiple first jet holes 21021 and / or multiple second jet holes 21022 are respectively arranged on its end wall 211 and / or peripheral wall 212. Through the one-to-one correspondence between the multiple jet sections 21 and the multiple air intake channels 101, each air intake channel 101 can obtain an independent and controllable gas supply path, avoiding the problem of uneven gas distribution caused by sharing the jet section 21 among different air intake channels 101. Furthermore, combined with the multi-hole arrangement on each jet section 21, the gas can be coordinated in the central region and the region near the inner peripheral surface within each air intake channel 101, thereby improving the premixing uniformity and combustion consistency of the combustion region corresponding to each air intake channel 101 at the overall burner 10 scale.

[0065] like Figures 2 to 5 As shown, in one embodiment, multiple fire bars 10 are provided, and each fire bar 10 has a jet section 21 corresponding to the air intake channel 101 of each fire bar 10.

[0066] In this embodiment, multiple burners 10 are arranged side-by-side or spaced apart in the burner 100. Each burner 10 has multiple air intake channels 101. The ejector device 20 is configured with a corresponding jet section 21 for each air intake channel 101 of each burner 10. Each jet section 21 independently injects gas into its corresponding air intake channel 101. This structure ensures that each air intake channel 101 of each burner 10 receives gas supply from its corresponding jet section 21, avoiding gas distribution deviations that may occur when multiple burners 10 or multiple air intake channels 101 share the same jet section 21. This helps maintain the consistency of the gas-air mixture state in each air intake channel 101 under the overall layout of multiple burners 10, thereby improving the uniformity of combustion and the stability of emission performance of the entire unit.

[0067] For ease of understanding, the following description assumes that there are three burner rows 10, and each burner row 10 has two air intake channels 101. In this case, the ejector device 20 has a total of six jet sections 21, each jet section 21 corresponding to one air intake channel 101 in one burner row 10, and extending into the corresponding air intake channel 101 according to the aforementioned structural features. It injects gas into the corresponding air intake channel 101 through its respective first jet hole 21021 and / or second jet hole 21022, thereby realizing independent and directional gas supply and mixing control for each air intake channel 101.

[0068] like Figure 5 and Figure 6 As shown, in one embodiment, the ejector device 20 further includes a gas distribution section 22, which has a gas distribution channel 2201. The gas distribution channel 2201 has a gas inlet 2202 at its inlet end and the exhaust end of the gas distribution channel 2201 is connected to the gas inlet 2101 of each ejector section 21.

[0069] In this embodiment, the gas distribution section 22 serves as a structure for distributing gas in the ejector device 20. One end of the gas distribution channel 2201 formed inside it receives an external gas source through a gas inlet 2202, and the other end is connected to the gas inlet 2101 of each of the multiple ejector sections 21, thereby distributing the introduced gas and delivering it to each ejector section 21. This configuration allows multiple ejector sections 21 to share the same gas inlet 2202, while the internal channels of the gas distribution channel 2201 enable the synchronous supply of gas to each ejector section 21. This helps to maintain a relative balance in the gas supply pressure and flow rate of each ejector section 21 in the burner 100 structure with multiple burners 10 or multiple air inlets 101, providing stable upstream conditions for the uniform mixing of gas and air in each air inlet 101.

[0070] like Figure 5 and Figure 6As shown, in one embodiment, the gas distribution channel 2201 includes a first flow section 22011 and a plurality of second flow sections 22012. The first flow section 22011 is provided with a gas inlet 2202. The first flow section 22011 is connected to the plurality of second flow sections 22012 respectively. The plurality of second flow sections 22012 are arranged opposite to each other along a first direction. Each second flow section 22012 has a plurality of diversion ports 2203. The surface of each second flow section 22012 is provided with a plurality of jet sections 21 spaced apart along a second direction. The gas inlets 2101 of the plurality of jet sections 21 are connected one-to-one with the plurality of diversion ports 2203. A plurality of burners 10 are arranged spaced apart along the second direction, and the second direction intersects with the first direction.

[0071] In this embodiment, the gas distribution channel 2201 introduces gas through the first flow section 22011 as the main channel, and distributes the gas flow from the first flow section 22011 to multiple second flow sections 22012 arranged opposite to each other along the first direction; each second flow section 22012 is provided with multiple flow outlets 2203, and each flow outlet 2203 is independently connected to the gas inlet 2101 of a jet section 21 to achieve one-to-one gas distribution; the multiple jet sections 21 are arranged in space at intervals along the second direction to form a multi-row layout, and correspondingly, the multiple burner rows 10 are also arranged along the second direction. The spaced arrangement allows each row of jet sections 21 to serve the corresponding burner 10. Since the second direction intersects with the first direction, this spatial layout helps to rationally arrange the connection between the gas distribution channels 2201, the jet sections 21, and the burner 10 within the limited installation space. At the same time, through the connection structure of the first flow section 22011 to multiple second flow sections 22012, the relative balance of gas pressure at each flow outlet 2203 is maintained, thereby supporting each jet section 21 to provide consistent gas supply conditions to the intake flow channel 101 of the corresponding burner 10.

[0072] like Figure 1 and Figure 2 As shown, in one embodiment, an airflow channel 103 is defined between the outer peripheral wall 212 of the jet section 21 and the edge of the air inlet 102, and the airflow channel 103 is used to draw air into the air inlet channel 101.

[0073] In this embodiment, when the jet section 21 extends at least partially into the intake passage 101 from the air inlet 102, an annular or partially annular gap is formed between its outer peripheral wall 212 and the inner edge of the air inlet 102, which constitutes the air passage 103. Under the ejection effect generated by the combustion gas ejected from the jet section 21, external air is drawn in through the air passage 103 and introduced into the intake passage 101, thereby realizing the autonomous ejection supply of primary air. This structure spatially separates the path of air entering the intake passage 101 through the air passage 103 from the path of combustion gas entering the intake passage 101 through the jet section 21, which helps to improve the primary air coefficient without relying on an external blower and provides the basic conditions for the premixing of combustion gas and air in the intake passage 101.

[0074] The structure of the combustion head 12 is described below.

[0075] like Figure 1 and Figure 2 As shown, in one embodiment, the combustion head 12 includes a flame distribution plate 121 and a metal mesh 122. The flame distribution plate 121 is provided with a plurality of flame holes 1201. The metal mesh 122 is stacked with the flame distribution plate 121 and covers the plurality of flame holes 1201.

[0076] It is understandable that when the metal mesh 122 covers multiple flame holes 1201, the dense mesh structure of the metal mesh 122 can play the role of flame segmentation. When the mixed gas is sprayed out from the multiple flame holes 1201 on the flame distribution plate 121 and ignited, the flame spreads upward. The dense mesh of the metal mesh 122 divides the relatively concentrated flame into countless uniform and stable micro flames, thereby preventing the flames from merging and forming local high-temperature areas.

[0077] Meanwhile, the mesh openings of the metal mesh 122 can generate a certain flow resistance to the ejected airflow. The uniformly distributed resistance formed by the metal mesh 122 helps to balance the airflow velocity across the entire combustion surface, preventing the gas from being excessively concentrated in certain burner holes 1201, thus avoiding excessively high local flame temperatures and allowing the flame to spread evenly on the surface of the metal mesh 122. This avoids concentrated flames and excessively high local flame temperatures during combustion, which would lead to the formation of large amounts of thermal nitrogen oxides.

[0078] like Figure 1 and Figure 2 As shown, in one embodiment, the metal mesh 122 is stacked in three or four layers along its thickness direction.

[0079] Understandably, if too many layers of metal mesh 122 are stacked, it will result in greater gas flow resistance. When the gas flows out of the burner holes 1201, it will encounter greater flow resistance, affecting combustion. If fewer layers of metal mesh 122 are stacked, such as only one layer, the gas flow resistance will be smaller, making it difficult to ensure that the gas is evenly ejected from the burner holes 1201. Therefore, three or four layers of metal mesh 122 are stacked to ensure moderate gas flow resistance and to ensure that the gas is evenly distributed to each burner hole 1201, thereby ensuring a more uniform flame distribution during combustion.

[0080] like Figure 1 and Figure 2 As shown, in one embodiment, the mesh size of the metal mesh 122 is not less than 0.55 mm and not more than 0.6 mm. For example, the mesh size of the metal mesh 122 can be a square mesh, and the mesh size can be the width of the mesh. This setting can avoid the mesh size being too small, which would affect the smooth flow of gas, and also avoid the mesh size being too large, which would prevent the metal mesh 122 from uniformly separating the flame. Exemplarily, the mesh size can be 0.55 mm, 0.56 mm, 0.57 mm, 0.58 mm, 0.59 mm, 0.6 mm, and any point value within the range [0.55, 0.6].

[0081] like Figure 1 and Figure 2 As shown, in one embodiment, the wire diameter of the metal mesh 122 is not less than 0.22 mm and not more than 0.25 mm. This setting ensures that the metal mesh 122 has sufficient wire diameter, thereby providing sufficient structural strength and durability in high-temperature environments, and preventing damage or deformation due to prolonged heating. Simultaneously, sufficient metal content allows the metal mesh 122 to have better thermal conductivity, which is beneficial for uniform temperature distribution. Exemplarily, the wire diameter of the metal mesh 122 can be 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, or any value within the range [0.22, 0.25].

[0082] like Figure 1 and Figure 2As shown, in one embodiment, the mesh count of the metal mesh 122 is not less than 30 mesh and not more than 40 mesh. It can be understood that a mesh count between 30 and 40 meshes means there are 30 to 40 holes per inch of length. This roughly corresponds to a mesh aperture of approximately 0.425 mm to 0.595 mm. This arrangement ensures that the mesh of the metal mesh 122 is dense enough to effectively divide the flame into uniform micro-flames, avoiding localized high temperatures, while also allowing sufficient airflow without causing excessive resistance to the flow of the mixed gas. This ensures that the burner 10 can output sufficient heat load and prevents the flame from concentrating on a few larger flame holes 1201, which could lead to excessively high combustion temperatures. Exemplarily, the mesh count of the metal mesh 122 can be 30, 32, 34, 36, 38, or 40 mesh.

[0083] like Figure 1 and Figure 2 As shown, in one embodiment, the metal mesh 122 is made of iron-chromium-aluminum. It is understood that iron-chromium-aluminum has better high-temperature resistance, can withstand the high temperatures generated by combustion, and can prevent deformation under high-temperature combustion conditions, thus extending the service life of the metal mesh 122.

[0084] like Figure 1 and Figure 2 As shown, in one embodiment, the combustion head 12 is welded and fixed to the burner body 11 to ensure assembly reliability. The combustion head 12 may also include a connecting edge circumferentially disposed around the burner plate 121. The connecting edge may be integrally formed with the burner plate 121 and can be welded to the inner peripheral wall 212 of the air intake channel 101 to achieve welding and fixing of the combustion head 12 and the burner body 11.

[0085] like Figure 1 and Figure 2 As shown, in one embodiment, the metal mesh 122 is welded to the flame distribution plate 121. The metal mesh 122 and the flame distribution plate 121 can be fixed by welding, for example, by spot welding. Of course, other welding methods can also be used to fix the metal mesh 122 and the flame distribution plate 121, and this is not limited here.

[0086] like Figure 1 and Figure 2 As shown, in one embodiment, the flame distribution plate 121 has a first plate surface 1211 disposed away from the air intake channel 101, the sum of the total areas of the plurality of flame holes 1201 is defined as S1, the area of ​​the first plate surface 1211 is defined as S2, and the ratio of S1 to S2 is not less than 0.5 and not greater than 0.65.

[0087] The first plate surface 1211 can be defined as the combustion surface of the flame distribution plate 121. When the ratio of the total area of ​​multiple flame holes 1201 to the area of ​​the combustion surface is between 0.5 and 0.65, it avoids the situation where the total area of ​​the flame holes 1201 occupies too little of the combustion surface area, resulting in excessively fast gas output velocity from each flame hole 1201, leading to an excessively long flame that concentrates in a few flame holes 1201, causing localized high temperatures and the generation of high-temperature nitrogen oxides. Conversely, it avoids the situation where the total area of ​​the flame holes 1201 occupies too much of the combustion surface area, resulting in insufficient structural strength of the flame distribution plate 121 and potentially excessively dispersed flames, leading to insufficient combustion intensity. Therefore, setting the ratio of the total area of ​​multiple flame holes 1201 to the area of ​​the first plate surface 1211 to between 0.5 and 0.65 ensures that the gas flow and combustion uniformity are balanced, guaranteeing combustion intensity while preventing the generation of nitrogen oxides from localized high temperatures. For example, the ratio of S1 to S2 can be 0.5, 0.52, 0.55, 0.56, 0.58, 0.6, 0.62, 0.65, or any point value within the interval [0.5, 0.65].

[0088] The present invention also proposes a water heater, which includes a burner 100. The specific structure of the burner 100 is as described in the above embodiments. Since the water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0089] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A burner, characterized in that, include: The burner has an air intake channel, and the air intake end of the air intake channel is provided with an air inlet; as well as An ejector device has a jet section corresponding to the air intake channel. The jet section extends at least partially into the air intake channel from the air inlet. The jet section has a gas inlet and a jet hole. The gas inlet communicates with the air intake channel via the jet hole. The jet direction of the jet hole is obliquely intersecting the gas delivery direction of the air intake channel. The jet section has an end wall opposite to the air inlet. The end wall is located within the air intake channel. The jet hole includes a first jet hole disposed on the end wall. The first jet hole extends obliquely towards the side close to the central axis of the air intake channel along the jet direction. The end wall has a first end face and a second end face opposite to each other along the axial direction of the jet section. The first end face and / or the second end face are conical surfaces that expand away from the air inlet.

2. The burner as claimed in claim 1, characterized in that, The jet section has a peripheral wall opposite to the peripheral surface of the air intake channel, and the jet hole includes a second jet hole provided on the peripheral wall. The second jet hole extends obliquely along the jet direction toward a side away from the central axis of the air intake channel.

3. The burner as described in claim 2, characterized in that, A first jet angle is formed between the jet direction of the first jet hole and the gas delivery direction of the inlet channel, and a second jet angle is formed between the jet direction of the second jet hole and the gas delivery direction of the inlet channel. The first jet angle and / or the second jet angle are not less than 5 degrees and not greater than 15 degrees.

4. The burner as described in claim 3, characterized in that, The first jet angle is greater than the second jet angle.

5. The burner as described in claim 2, characterized in that, The first jet hole is provided in multiple ways, and the multiple first jet holes are arranged at intervals along the circumference of the jet section on the end wall; And / or, the second jet hole is provided in a plurality of them, and the plurality of the second jet holes are arranged at intervals along the circumference of the jet portion on the peripheral wall.

6. The burner as claimed in claim 2, characterized in that, The second jet hole is provided in multiple ways, and the multiple second jet holes are arranged at equal intervals along the circumference of the jet section; The projections of the central axes of the plurality of second jet holes onto a reference plane perpendicular to the gas delivery direction of the inlet air passage lie on the same circumference.

7. The burner as claimed in claim 2, characterized in that, The fire duct is provided with multiple air intake channels, and the jet section is provided with multiple jet sections. The multiple jet sections are arranged in a one-to-one correspondence with the multiple air intake channels. Each jet section is provided with multiple first jet holes and / or multiple second jet holes.

8. The burner as claimed in claim 7, characterized in that, Multiple fire bars are provided, and the ejector device is provided with the jet section in the air intake channel of each fire bar.

9. The burner as claimed in claim 8, characterized in that, The ejector device further includes a gas distribution section, which has a gas distribution channel. The gas distribution channel has a gas inlet at its inlet end and an exhaust end connected to the gas inlet of each ejector section.

10. The burner as claimed in claim 9, characterized in that, The gas distribution channel includes a first flow section and multiple second flow sections. The first flow section is provided with the gas inlet. The first flow section is connected to multiple second flow sections respectively. The multiple second flow sections are arranged opposite to each other along a first direction. Each second flow section has multiple distribution ports. Each of the second flow sections has a plurality of jet sections arranged at intervals along the second direction on its surface, and the gas inlets of the plurality of jet sections are connected one-to-one with the plurality of branch ports; The plurality of fire bars are arranged at intervals along a second direction, which intersects with the first direction.

11. The burner according to any one of claims 1 to 10, characterized in that, An airflow channel is defined between the outer peripheral wall of the jet section and the edge of the air inlet, and the airflow channel is used to draw air into the air inlet channel.

12. A water heater, characterized in that, Including the burner as described in any one of claims 1 to 11.

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