Combustor and gas water heater

Abstract

The application discloses a burner and a gas water heater. The burner comprises a cavity, a plurality of distribution cavities arranged in a first direction in the cavity, a plurality of ejectors arranged side by side in the first direction and connected with one end of the cavity in a second direction, and a cover arranged at the other end of the cavity in the second direction. Each of the ejectors has an ejecting flow channel, one end of the distribution cavity is communicated with a gas outlet of the corresponding ejecting flow channel of the ejector, and the other end of the distribution cavity is arranged to discharge gas towards the cover. According to the burner, the cover is arranged on the whole cavity, the space in the cavity is used to the maximum, the gas discharge area of the cover is increased, the heat load of the burner is increased, the combustion capacity of the burner is greatly improved, the emission of nitrogen oxides is reduced, the structure of the burner is simpler, the manufacture of the burner is more convenient, and the adaptability of the burner is stronger.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202110602441.9, filed on May 31, 2021, by Wuhu Midea Kitchen & Bath Appliances Manufacturing Co., Ltd. and Midea Group Co., Ltd., the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of gas equipment technology, and in particular to a burner and a gas water heater. Background Technology

[0004] In gas water heaters, the burner is the core component. Existing gas water heater burners use fully premixed combustion technology, rich-lean combustion technology, and water-cooled combustion technology to achieve low nitrogen oxide combustion. They typically employ a multi-piece combined burner structure. This single-piece burner structure has a low combustion intensity due to its small heat load (generally 2-3kW per piece), resulting in poor flue gas performance and high nitrogen oxide emissions. Although fully premixed combustion technology can achieve low emissions of carbon monoxide and nitrogen oxides, its high manufacturing requirements lead to high costs, preventing mass production. Furthermore, the existing burner structure cannot meet the requirements for low nitrogen oxide emissions. Therefore, it is necessary to improve the structure of the burner. Summary of the Invention

[0005] 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 burner with a simple structure that can increase the heat load of the burner, greatly improve the combustion capacity of the burner, and reduce nitrogen oxide emissions.

[0006] The present invention also proposes a gas water heater having the above-mentioned burner.

[0007] According to a first aspect of the present invention, a burner includes: a cavity having a plurality of distribution cavities arranged along a first direction; a plurality of ejectors arranged side-by-side along the first direction and connected to one end of the cavity in a second direction; and a cover disposed at the other end of the cavity in the second direction, wherein each ejector has an ejector channel, one end of the distribution cavity is connected to the outlet of the ejector channel of the corresponding ejector, and the other end of the distribution cavity exits towards the cover.

[0008] According to the present invention, the burner, by setting the cover on the entire cavity, can maximize the use of the space inside the cavity, increase the gas outlet area of ​​the cover, thereby increasing the heat load of the burner, greatly improving the combustion capacity of the burner, and reducing nitrogen oxide emissions. The burner has a simpler structure, is easier to manufacture, and has stronger adaptability.

[0009] According to some embodiments of the present invention, the cover has multiple air outlet zones, each of which corresponds to a plurality of distribution cavities, and each air outlet zone is provided with multiple air outlet holes arranged at intervals.

[0010] In some embodiments, each of the vents forms an elongated hole extending along the first direction, and in each vent region, at least a portion of the plurality of vents are spaced apart along a third direction.

[0011] In some examples, in the third direction, a plurality of the air vents located in the middle are arranged at intervals along the first direction and the third direction, and a plurality of the air vents located on both sides are arranged alternately in the third direction.

[0012] In some examples, the plurality of air outlets are respectively a first air outlet and a second air outlet, and each air outlet area is provided with a plurality of first hole groups, wherein the plurality of first hole groups are arranged at intervals along the first direction, and each first hole group includes a plurality of first air outlets and the plurality of first air outlets are arranged at intervals along the third direction.

[0013] In some specific examples, each of the air outlet areas is provided with two second hole groups, which are arranged at intervals along the third direction and located on both sides of the first hole group. The second hole group includes a plurality of first air outlets and a plurality of second air outlets, which are arranged at intervals along the third direction. A plurality of first air outlets are arranged at intervals along the first direction between two adjacent second air outlets.

[0014] In some specific examples, the length of the second vent in the first direction is greater than the length of the first vent in the first direction.

[0015] In some examples, the first direction, the second direction, and the third direction are perpendicular to each other.

[0016] In some embodiments, the cover includes: a cover plate having a plurality of spaced-apart mounting openings; and a metal mesh sandwiched between the cover plate and the cavity and covering the plurality of mounting openings, wherein a plurality of air vents are formed on the metal mesh.

[0017] In some examples, the other end of the cavity has a connecting flange on its periphery, the metal mesh is supported on the connecting flange, the cover plate covers the outside of the metal mesh, and the periphery of the cover plate has a limiting flange that clamps the metal mesh and the connecting flange.

[0018] According to some embodiments of the present invention, the cover is a one-piece molded part.

[0019] According to some embodiments of the present invention, the outer periphery of the cover is provided with a bent portion, the bent portion surrounding the cavity.

[0020] According to a further embodiment of the present invention, the burner further includes: a guide plate disposed in the cavity and opposite to the air outlet of the ejector channel, the guide plate being provided with vent holes to allow the airflow delivered by the ejector channel to uniformly pass through the cover.

[0021] In some embodiments, the guide plate is located between the cavity and the cover, and the guide plate has a plurality of ventilation zones arranged along the first direction. The plurality of ventilation zones correspond one-to-one with the air outlets of the plurality of ejector channels, and each ventilation zone is provided with a plurality of ventilation holes arranged at intervals.

[0022] In some examples, the outer periphery of the guide plate is sandwiched between the cavity and the cover and connected together by a plurality of fasteners.

[0023] In some examples, the guide plate includes a plurality of flow guides spaced apart along the first direction, the plurality of flow guides being opposite to the ejector channels of the plurality of ejectors, wherein the flow guides are located within the dispensing cavity and spaced apart from the cover, and the venting zone is disposed in the flow guides.

[0024] In some specific examples, the guide section forms a horizontal plate segment.

[0025] In some specific examples, the flow guide includes a first plate segment and a second plate segment arranged and connected along the first direction, the first plate segment and the second plate segment extending obliquely toward the air outlet in a direction close to each other, and a plurality of the air vents are provided on the first plate segment and the second plate segment.

[0026] In some specific examples, two adjacent flow guides are connected by an embedding part, one side of which protrudes towards the cover and the other side forms an embedding groove. The cavity is provided with multiple partitions, which divide the inner cavity of the cavity into multiple distribution cavities. The edges of the partitions are embedded in the embedding groove.

[0027] In some specific examples, each of the partitions includes: two vertical partitions, which are spaced apart along the first direction, with one end of each vertical partition abutting against the inner wall of the cavity and the other end engaging with the embedding groove; and a horizontal partition, with both ends of the horizontal partition connected to the two vertical partitions respectively, and the horizontal partition having an air passage connecting the distribution cavity and the air outlet.

[0028] In some embodiments, the guide plate includes a blocking portion and an inclined portion, the blocking portion having a gap with the cover, and the blocking portion being opposite to the high-speed air outlet position of the ejector channel, the inclined portion being connected to the blocking portion and inclined toward the cover.

[0029] In some embodiments, the guide plate separates the ejector channel and the cover, and there is a gap between the guide plate and the cover.

[0030] In some embodiments, the ejector channel extends along a third direction and is connected to an air inlet at one end, an air outlet is formed on one side of the ejector channel along a second direction, and the guide plate is opposite to the end of the ejector channel away from the air inlet, wherein the second direction and the third direction are perpendicular.

[0031] In some examples, the inner surface of the ejector channel at the end away from the air inlet is configured as an arcuate surface, with the opening of the arcuate surface facing the air inlet.

[0032] In some embodiments, one end of the cavity is provided with a mating hole, and the edge of the mating hole is provided with a first positioning flange that is inserted into the air outlet of the ejector channel; and / or, the guide plate is provided with a plurality of vent holes, the plurality of vent holes having the same size or at least some of the plurality of vent holes having different sizes.

[0033] A gas water heater according to a second aspect of the present invention includes a burner as described in the above embodiments.

[0034] According to embodiments of the present invention, by employing the above-described burner, the quality and performance indicators of the gas water heater can be improved, thus meeting production and usage requirements.

[0035] 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

[0036] 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:

[0037] Figure 1This is a schematic diagram of a burner according to an embodiment of the present invention;

[0038] Figure 2 yes Figure 1 An enlarged view of part A shown in the image;

[0039] Figure 3 yes Figure 1 Top view of the burner shown;

[0040] Figure 4 yes Figure 3 A partial enlarged view of the burner cover shown;

[0041] Figure 5 yes Figure 1 Side view of the burner shown;

[0042] Figure 6 yes Figure 1 The assembly diagram of the burner ejector and cavity shown is shown.

[0043] Figure 7 yes Figure 6 A top view of the structure shown;

[0044] Figure 8 yes Figure 1 The diagram shows the structural design of the burner cover.

[0045] Figure 9 yes Figure 8 An enlarged view of the cover shown;

[0046] Figure 10 yes Figure 8 The top view of the cover shown;

[0047] Figure 11 This is a schematic diagram of a burner according to another embodiment of the present invention;

[0048] Figure 12 yes Figure 11 An enlarged view of part B shown in the diagram;

[0049] Figure 13 yes Figure 11 The diagram shows the structural design of the burner cover.

[0050] Figure 14 yes Figure 13 An enlarged view of the cover shown;

[0051] Figure 15 yes Figure 13 The top view of the cover shown;

[0052] Figure 16This is a schematic diagram of a burner according to another embodiment of the present invention;

[0053] Figure 17 yes Figure 16 An enlarged view of section C shown in the diagram;

[0054] Figure 18 This is a schematic diagram of a burner from another direction according to yet another embodiment of the present invention;

[0055] Figure 19 This is a schematic diagram of a burner from another embodiment of the present invention, in which the arrows indicate the airflow direction;

[0056] Figure 20 This is a schematic diagram showing the assembly of the burner cover, metal mesh, and guide plate according to another embodiment of the present invention.

[0057] Figure 21 This is a schematic diagram of the guide plate of a burner according to another embodiment of the present invention;

[0058] Figure 22 This is a side view of the guide plate of a burner according to another embodiment of the present invention;

[0059] Figure 23 This is a schematic diagram of the separator of a burner according to another embodiment of the present invention;

[0060] Figure 24 This is a side view of the separator of a burner according to another embodiment of the present invention;

[0061] Figure 25 This is a schematic cross-sectional view of the separator of a burner according to another embodiment of the present invention;

[0062] Figure 26 This is a schematic diagram of a burner from another direction according to another embodiment of the present invention;

[0063] Figure 27 This is a schematic diagram of a burner from another direction according to another embodiment of the present invention;

[0064] Figure 28 This is a schematic diagram showing the assembly of the burner cover, metal mesh, and guide plate according to another embodiment of the present invention;

[0065] Figure 29 This is a schematic diagram of the guide plate of a burner according to another embodiment of the present invention.

[0066] Reference numerals: Burner 100, Ejector 10, Inlet 101, Outlet 102, Ejector Flow Channel 108, First Flow Channel 1081, Second Flow Channel 1082, Third Flow Channel 1083, Cavity 20, Mixing Chamber 201, Mating Hole 202, Top Opening 203, Distribution Chamber 204, Connecting Flanged Flange 21, Connecting Hole 211, Second Positioning Flanged Flange 221, First Positioning Flanged Flange 222, Separator 23, Air Outlet 231, Vertical Baffle 232, Horizontal Baffle 233, Cover 30 Air outlet area 301, first hole group 3011, second hole group 3012, air outlet 302, first air outlet 3021, second air outlet 3022, bending part 303, cover plate 31, metal mesh 32, guide plate 40, vent hole 401, venting area 4011, flow guide part 402, horizontal plate segment 4021, first plate segment 4022, second plate segment 4023, embedding part 403, embedding groove 404, shielding part 41, inclined part 42, fastener 50, mating flange 51, limiting flange 53. Detailed Implementation

[0067] 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.

[0068] The following is for reference. Figures 1-29 A burner 100 according to an embodiment of the present invention is described.

[0069] like Figures 1-4 As shown, the burner 100 according to an embodiment of the present invention includes a cavity 20, and the cavity 20 has a plurality of distribution cavities 204 arranged along a first direction.

[0070] The burner 100 includes a plurality of ejectors 10 and a cover 30. The plurality of ejectors 10 are arranged along a first direction, and the plurality of ejectors 10 are all located at one end of the cavity 20 in a second direction. The cover 30 is located at the other end of the cavity 20 in the second direction, that is, the cover 30 and the plurality of ejectors 10 are located at opposite ends of the cavity 20.

[0071] Furthermore, each ejector 10 has an ejector channel 108, one end of the distribution cavity 204 is connected to the air outlet 102 of the ejector channel 108 of the corresponding ejector 10, and the other end of the distribution cavity 204 is directed to the cover 30 for air discharge.

[0072] According to the present invention, the burner 100, by setting the cover 30 on the entire cavity 20, can make maximum use of the space inside the cavity 20, increase the air outlet area of ​​the cover 30, thereby increasing the heat load of the burner 100, greatly improving the combustion capacity of the burner 100, and reducing the emission of nitrogen oxides. The burner 100 has a simpler structure, is easier to manufacture, and has stronger adaptability.

[0073] According to some embodiments of the present invention, the cover 30 has a plurality of venting zones 301, which correspond one-to-one with a plurality of distributing cavities 204. That is, the plurality of venting zones 301 are arranged along a first direction, and each venting zone 301 is provided with a plurality of spaced-apart vent holes 302. In other words, the cover 30 covers the cavity 20 as an integral structure.

[0074] In some embodiments, the ejector channel 108 has an air inlet 101 and an air outlet 102. The air outlets 102 of the plurality of ejector channels 108 are connected to the plurality of distribution chambers 204 in a one-to-one correspondence, so that the gas entering from the air inlet 101 can enter the corresponding distribution chamber 204 through the ejector channel 108.

[0075] like Figure 1 and Figure 2 As shown, in this embodiment, the length direction of the cavity 20 is along the first direction (e.g., Figure 1 The cavity 20 extends in the left-right direction (as shown), and its height direction follows the second direction (as shown). Figure 1 Extending in the vertical direction shown, the lower surface of the cavity 20 is provided with a plurality of mating holes 202 arranged at intervals along its length direction, and the upper surface of the cavity 20 is provided with a plurality of top openings 203 arranged at intervals along its length direction. The cavity 20 has a plurality of distribution cavities 204, which are arranged along the length direction of the cavity 20. The plurality of distribution cavities 204 correspond one-to-one with the plurality of top openings 203, and the plurality of distribution cavities 204 correspond one-to-one with the plurality of mating holes 202, so that the top openings 203 and the mating holes 202 are connected through the corresponding distribution cavities 204.

[0076] Furthermore, multiple ejectors 10 are connected to the lower end of the cavity 20, and the multiple ejectors 10 are arranged at intervals along the length direction of the cavity 20, that is, multiple ejector channels 108 are arranged at intervals along the length direction of the cavity 20, and the air outlets 102 of the multiple ejector channels 108 are connected to the mating holes 202 of the multiple distribution cavities 204 in a one-to-one correspondence.

[0077] The cover 30 is connected to the upper end of the cavity 20. The cover 30 extends along the length of the cavity 20. The cover 30 has a plurality of air outlet areas 301 arranged along the length of the cavity 20, so that the mating hole 202 of the distribution cavity 204 is connected to the air outlet 102 of the corresponding ejector channel 108, and the top opening 203 of the distribution cavity 204 is connected to a plurality of air outlet holes 302 on the corresponding air outlet area 301.

[0078] According to some embodiments of the present invention, each vent 302 is formed into an elongated hole, the length direction of which is along a first direction (e.g., Figure 3 Extending in the left-right direction (as shown). In each venting zone 301, at least a portion of the plurality of vents 302 extend along a third direction (e.g., as shown in the left-right direction). Figure 3 The air outlets 302 are arranged at intervals in the front-to-back direction as shown. Therefore, by setting the air outlets 302 as elongated holes and arranging some of the air outlets 302 in each air outlet area 301 at intervals in the third direction, the uniformity of airflow can be effectively improved, so that the airflow in the cavity 20 can be evenly delivered through the cover 30.

[0079] In some embodiments, in the third direction, a plurality of air outlets 302 located in the middle are arranged at intervals along the first direction and the third direction, that is, the plurality of air outlets 302 located in the middle are arranged in multiple rows, and each row includes a plurality of air outlets 302. The arrangement is orderly, which is convenient for processing and helps to improve the uniformity of airflow, so as to achieve low emissions of nitrogen oxides and the like.

[0080] Furthermore, in the third direction, multiple air outlets 302 located on both sides are staggered in the third direction, thereby balancing the airflow in various parts of the cavity 20, effectively improving the uniformity of airflow in the cavity 20 and the mixing effect of gas and air, thereby greatly improving the combustion capacity of the burner 100 and reducing nitrogen oxide emissions.

[0081] Specifically, such as Figure 3 As shown, in this embodiment, in the third direction, the multiple air outlets 302 located in the middle are arranged in two rows. The multiple air outlets 302 in each row are arranged at intervals along the third direction, and the multiple air outlets 302 in the two rows are directly opposite each other, while the multiple air outlets 302 located on both sides are arranged alternately.

[0082] like Figure 3 and Figure 4 As shown, in some embodiments, the multiple air outlets 302 are respectively the first air outlet 3021 and the second air outlet 3022. Each air outlet area 301 is provided with multiple first hole groups 3011. The multiple first hole groups 3011 are arranged at intervals along the first direction. Each first hole group 3011 includes multiple first air outlets 3021. The multiple first air outlets 3021 are arranged at intervals along the third direction, and are arranged in an orderly manner, which is convenient for processing and manufacturing.

[0083] In some examples, each air outlet zone 301 is provided with two second hole groups 3012, which are arranged at intervals along a third direction. The two second hole groups 3012 are located on both sides of the first hole group 3011. The second hole group 3012 includes a plurality of first air outlets 3021 and a plurality of second air outlets 3022, which are arranged at intervals along a third direction. A plurality of first air outlets 3021 are provided between two adjacent second air outlets 3022, which are arranged at intervals along a first direction.

[0084] Therefore, by setting multiple air outlets 302 in the air outlet area 301 as described above, the airflow can be guided to balance the airflow in various parts of the cavity 20, effectively improving the uniformity of the airflow and its mixing effect in the front cavity 20.

[0085] In some examples, the length of the second vent 3022 in the first direction is greater than the length of the first vent 3021 in the first direction, resulting in a simple structure that is easy to process and manufacture.

[0086] Figure 3 and Figure 4 A specific embodiment of the burner 100 is shown. Each air outlet zone 301 on the cover 30 is provided with two first hole groups 3011 and two hole groups 3012. The two first hole groups 3011 are located in the middle of the cover 30 in a third direction, and the two second hole groups 3012 are located on both sides of the cover 30 in a third direction. The two first hole groups 3011 are spaced apart along a first direction, and each first hole group 3011 includes a plurality of first air outlet holes 3021, which are spaced apart along a third direction. The second hole group 3012 includes two first air outlet holes 3021 and two second air outlet holes 3022. The two second air outlet holes 3022 are spaced apart along a third direction, and the two first air outlet holes 3021 are spaced apart along the first direction and located between the two second air outlet holes 3022. The length of the second air outlet hole 3022 is greater than the length of the first air outlet hole 3021.

[0087] In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other. Specifically, as shown in the figure... Figure 1 and Figure 3 As shown, the first direction extends along the left and right direction, the second direction extends along the up and down direction, and the third direction extends along the front and back direction. The cavity 20 can form a cuboid structure. The length direction of the cavity 20 extends along the left and right direction, the height direction of the cavity 20 extends along the up and down direction, and the width direction of the cavity 20 extends along the front and back direction, resulting in a compact structure.

[0088] According to some embodiments of the present invention, the cover 30 is a one-piece molded part. By making the cover 30 a one-piece molded part, not only is the processing procedure of the cover 30 simplified and the structural strength improved, but also unnecessary connecting structures can be eliminated, reducing costs. In addition, this arrangement of the cover 30 also helps to increase the area of ​​the gas outlet zone 301, thereby increasing the number of gas outlet holes 302 and improving the performance of the burner 100.

[0089] According to some embodiments of the present invention, the outer periphery of the cover 30 is provided with a bending portion 303, which surrounds the cavity 20. The bending portion 303 can not only position the cavity 20 and realize the positioning and installation of the cavity 20 and the cover 30, but also cover the gap between the cavity 20 and the cover 30, ensuring the appearance of the burner 100 and protecting the cavity 20.

[0090] Specifically, such as Figure 1 , Figures 3-4 As shown, the cover 30 is disposed at the upper end of the cavity 20. The outer periphery of the cover 30 is provided with a downwardly bent portion 303. The bent portion 303 surrounds the upper outer periphery of the cavity 20, thereby covering the gap between the cover 30 and the upper outer periphery of the cavity 20.

[0091] In some embodiments, the upper outer periphery of the cavity 20 is provided with an outwardly bent connecting flange 21, the connecting flange 21 forming an annulus extending circumferentially along the cavity 20, and the connecting flange 21 is provided with a plurality of connecting holes 211 arranged at intervals along its circumference. The cover 30 covers the upper end of the cavity 20, and the cover 30 and the connecting flange 21 are engaged by a plurality of fasteners 50 passing through the plurality of connecting holes 211, thereby connecting the cavity 20 and the cover 30 together. The structure is simple and easy to assemble and disassemble.

[0092] Among them, such as Figure 2 As shown, a second positioning flange 221 is provided on the side surface of the connecting flange 21 facing away from the cover 30. The second positioning flange 221 forms an annular flange extending circumferentially along the connecting hole 211. The second positioning flange 221 can cooperate with the fastener 50 to further ensure the reliability of the connection between the cavity 20 and the cover 30.

[0093] According to other embodiments of the present invention, the cover 30 includes a cover plate and a metal mesh. The cover plate has a plurality of spaced-apart mounting openings, and the metal mesh is sandwiched between the cover plate and the cavity and covers the plurality of mounting openings. A plurality of air outlets 302 are formed on the metal mesh. By providing the metal mesh, the uniformity of airflow can be effectively improved, so that the airflow in the cavity 20 can be uniformly delivered through the cover 30.

[0094] like Figure 16 and Figure 17The other end of the cavity 20 has a connecting flange 21 around its periphery. The metal mesh 32 is supported on the connecting flange 21, and the cover plate 31 covers the outside of the metal mesh 32. The cover plate 31 has a limiting flange 53 around its periphery, which clamps the metal mesh 32 and the connecting flange 21. By setting the connecting flange 21 and the limiting flange 53, the connection between the cover plate 30 and the cavity 20 can be effectively improved, and the stability of the connection can be enhanced.

[0095] According to some embodiments of the present invention, the burner 100 further includes a guide plate 40, which is disposed in the mixing chamber 201 and opposite to the air outlet 102 of the ejector channel 108. The guide plate 40 is provided with a vent hole 401 so that the airflow sent from the ejector channel 108 can be uniformly delivered to the cover 30.

[0096] Specifically, the ejector channel 108 can guide the airflow into the cavity 20, where it mixes. When the airflow enters the cavity 20, the jet velocity of the gas injected from the ejector channel 108 is not uniform at different points. However, as the airflow passes through the guide plate 40, it is homogenized to a certain extent. By setting the guide plate 40, the airflow can be more evenly distributed to the cover 30, effectively improving the uniformity of the airflow and achieving low emissions of nitrogen oxides. The burner 100 has a uniform flame, low combustion noise, wide adaptability, stable combustion performance, better flue gas emission indicators, and lower emissions of carbon monoxide and nitrogen oxides. It can also reduce the size and lower the cost.

[0097] In some embodiments, the guide plate 40 is disposed between the cavity 20 and the cover 30. The guide plate 40 has a plurality of ventilation zones 4011, which are arranged along a first direction. The plurality of ventilation zones 4011 correspond one-to-one with the air outlets 102 of the plurality of ejector channels 108. Each ventilation zone 4011 is provided with a plurality of spaced ventilation holes 401.

[0098] Specifically, such as Figure 3 As shown, the inner surface of the ejector channel 108 at the end furthest from the air inlet 101 is constructed as an arc-shaped surface, with the opening of the arc-shaped surface facing the air inlet 101. This allows the airflow to flow smoothly and improves the stability of the airflow. When the airflow flows along the arc-shaped surface, the flow rate and velocity of the airflow exiting from the edge of the arc-shaped surface are relatively large. Therefore, this area constitutes a high-speed air outlet position. A guide plate 40 can be positioned at this location, with the guide plate 40 opposite to all the air outlets 102, effectively homogenizing the airflow and mixing effect within the cavity 20.

[0099] In this configuration, the multiple vents 401 may be of the same size or at least some of them may be of different sizes, and the multiple vents 401 may be arranged at equal intervals; alternatively, a portion of the multiple vents 401 may be arranged at equal intervals with a first interval, while another portion of the multiple vents 401 may be arranged at equal intervals with a second interval. Specifically, the airflow uniformity can be achieved by different settings for the shape, size, density, etc. of the vents 401 on the guide plate 40.

[0100] In some embodiments, the outer periphery of the guide plate 40 is sandwiched between the cavity 20 and the cover 30. The outer periphery of the guide plate 40, the cavity 20 and the cover 30 are connected together by a plurality of fasteners 50 to ensure the installation reliability and stability of the guide plate 40.

[0101] Specifically, the connecting flange 21 of the cavity 20 is provided with a plurality of connecting holes 211 arranged at intervals along its circumference. The guide plate 40 is disposed at the upper end of the cavity 20. The outer periphery of the guide plate 40 is provided with a plurality of through holes arranged at intervals along its circumference. The positions of the plurality of through holes correspond one-to-one with the positions of the plurality of connecting holes 211. The cover 30 covers the top of the guide plate 40. The cover 30 is provided with a plurality of through holes arranged at intervals along its circumference. The positions of the plurality of through holes correspond one-to-one with the positions of the plurality of through holes. Each fastener 50 can sequentially pass through the through holes on the cover 30, the through holes on the guide plate 40, and the connecting holes 211 on the connecting flange 21, thereby connecting the cavity 20, the guide plate 40, and the cover 30 together.

[0102] Optionally, the inner peripheral wall of the second positioning flange 221 on the connecting flange 21 may be provided with a threaded structure. The fastener 50 cooperates with the threaded structure, eliminating the need for a nut structure. This makes the structure simpler, easier to install and disassemble, and lower in cost. It also ensures the installation reliability of the fastener 50, thereby ensuring the connection reliability of the cavity 20, the cover 30, and the guide plate 40.

[0103] like Figures 7-9 as well as Figures 12-14 As shown, in some embodiments, the guide plate 40 includes a plurality of flow guide sections 402, which are spaced apart along a first direction. Each flow guide section 402 is opposite to the ejector channels of a plurality of ejectors. The flow guide sections 402 are located within the distribution cavity 204 and are spaced apart from the cover 30. A ventilation zone 4011 is located within the flow guide section 402. The flow guide section 402 is directly opposite the air outlet 102. By providing the flow guide section 402, the airflow and mixing effect within the cavity 20 can be effectively homogenized.

[0104] In some examples, each guide section 402 is provided with two sets of vent holes 401, the two sets of vent holes 401 are arranged at intervals along a first direction, and a plurality of vent holes 401 in each set are arranged at intervals along a third direction, and the plurality of vent holes 401 in the two sets are aligned. Each vent hole 401 forms an elongated hole extending along the first direction.

[0105] like Figure 8 As shown, in some examples, the flow guide 402 includes a first plate segment 4022 and a second plate segment 4023, which are arranged along a first direction. One side of the first plate segment 4022 is connected to one side of the second plate segment 4023. The first plate segment 4022 and the second plate segment 4023 extend obliquely toward the air outlet 102 in a direction close to each other.

[0106] The first plate segment 4022 extends along the third direction in the length direction, and the first plate segment 4022 is provided with a plurality of vent holes 401 arranged at intervals along its length direction. The second plate segment 4023 is provided with a plurality of vent holes 401 arranged at intervals along its length direction.

[0107] like Figure 13 As shown, in some examples, the guide section 402 forms a horizontal plate segment 4021, which has a simple structure and is easy to form.

[0108] In some examples, two adjacent flow guides 402 are connected by an embedding part 403. That is, the guide plate 40 includes a plurality of flow guides 402 and a plurality of embedding parts 403. The plurality of flow guides 402 are arranged at intervals along a first direction, and the plurality of embedding parts 403 are arranged at intervals along a first direction. Two adjacent flow guides 402 are connected by an embedding part 403, and two adjacent embedding parts 403 are connected by a flow guide 402.

[0109] Furthermore, one side of the embedding part 403 protrudes towards the cover and the other side defines an embedding groove 404. The cavity 20 is provided with a plurality of partitions 23, which divide the inner cavity of the cavity 20 into a plurality of distribution cavities 204. The edges of the partitions 23 are embedded in the embedding groove 404.

[0110] Therefore, by providing multiple partitions 23 within the cavity 20, multiple distribution chambers 204 can be constructed within the cavity 20, ensuring that the mixed gases entering from each chamber are evenly distributed without interfering with each other, thus improving the uniformity of airflow. Furthermore, the partitions 23 can support the cover 30 and the guide plate 40, reducing their deformation after heating, achieving segmented combustion, and lowering the heat load. By providing an insert 403 between the two guide sections 402, the guide plate 40 and the partitions 23 can be easily fitted together, ensuring the stability of the partitions 23 within the cavity 20.

[0111] like Figure 5 As shown, in some specific examples, each partition 23 includes two vertical partitions 232 and a horizontal partition 233. The two vertical partitions 232 are arranged at intervals along a first direction. One end of each vertical partition 232 abuts against the inner wall of the cavity 20, and the other end of each vertical partition 232 is inserted into the embedding groove 404. The horizontal partition 233 extends along the first direction. One end of the horizontal partition 233 is connected to one end of one of the vertical partitions 232, and the other end of the horizontal partition 233 is connected to one end of the other vertical partition 232. The horizontal partition 233 is provided with an air passage 231, which connects the distribution cavity 204 and the air outlet 102.

[0112] In other words, the separator 23 is constructed in the shape of a U-shaped cross section, and the closed end of the separator 23 is provided with an air outlet 231. The edge of the air outlet 231 is provided with a fixed flange that is inserted into the mating hole 202 of the cavity 20, thereby further improving the stability of the separator 23 and enabling the airflow to flow stably between the ejector channel 108 and the distribution cavity 204, thereby improving the airflow effect.

[0113] In some specific examples, the length of the air outlet 102 extends along a third direction, and the width of the air outlet 102 extends along a first direction. Correspondingly, the length of the air passage 231 extends along a third direction, and the width of the air passage 231 extends along a first direction.

[0114] In some specific examples, each mating hole 202 of the cavity 20 is provided with a first positioning flange 222, which is inserted into the air outlet 102 of the ejector channel 108. That is, multiple first positioning flanges 222 on the lower end of the cavity 20 are inserted into the air outlets 102 of multiple ejector channels 108 in a one-to-one correspondence.

[0115] In this invention, a multi-ejector 10 air intake structure design is adopted, which improves the ejector capacity of the burner 100. The combustion surface adopts an integral cover 30 structure to maximize the use of the cavity 20 space, which can realize low-emission water heaters of various specifications. A guide plate 40 is added at the position of the cavity 20 where the airflow speed is relatively fast, which makes the combustion more uniform, the performance more stable, and the flue gas emission index better.

[0116] Combination Figures 16 to 29According to some embodiments of the present invention, the burner 100 includes: an ejector 10, a cavity 20, and a guide plate 40. The ejector 10 has an ejector channel 108. The cavity 20 is connected to the ejector 10 on one side along a second direction and has a cover 30 on the other side. The cavity 20 has a mixing chamber 201 communicating with the outlet 102 of the ejector channel 108. The guide plate 40 is disposed in the mixing chamber 201 and faces the outlet 102 of the ejector channel 108. The guide plate 40 has vent holes 401 to ensure that the airflow from the ejector channel 108 flows evenly to the cover 30.

[0117] Specifically, the ejector channel 108 can guide the airflow into the cavity 20, where it mixes. When the airflow enters the cavity 20, the jet velocity of the gas injected from the ejector channel 108 is not uniform at different points. However, as the airflow passes through the guide plate 40, it is homogenized to a certain extent. By setting the guide plate 40, the airflow can be more evenly distributed to the cover 30, effectively improving the uniformity of the airflow and achieving low emissions of nitrogen oxides.

[0118] According to the embodiment of the present invention, the burner 100 can improve the uniformity of airflow to achieve low emissions of nitrogen oxides, etc. The burner 100 has a uniform flame, low combustion noise, wide adaptability, stable combustion performance, better flue gas emission indicators, and lower emissions of carbon monoxide and nitrogen oxides, and can reduce the size and cost.

[0119] like Figure 18 and Figure 19 In some embodiments of the present invention, the guide plate 40 includes a blocking portion 41 and an inclined portion 42. The blocking portion 41 has a gap with the cover 30, and the blocking portion 41 is opposite to the high-speed air outlet position of the ejector channel 108. The inclined portion 42 is connected to the blocking portion 41 and is inclined towards the cover 30. The high-speed air outlet position refers to the position where the output airflow velocity of the air outlet 102 is relatively high, corresponding to other air outlet positions of the air outlet 102. Specifically, due to the structural design of the ejector 10, the air outlet velocity of the ejector 102 may be different at various points, resulting in positions with higher and lower airflow velocities. The high-speed air outlet position of the air outlet 102 refers to the position where the airflow velocity of the air outlet 102 is higher. For ejectors 10 with different shapes or structures, the high-speed air outlet position will be different and can be determined according to actual design, measurement, and other methods. In this invention, by providing the shielding part 41, the high-speed air output of the air outlet 102 can be slowed down, thereby averaging the airflow velocity. The inclined part 42 can guide the airflow to balance the airflow in various parts of the cavity 20, effectively improving the airflow uniformity and mixing effect in the front cavity 20.

[0120] Optionally, such as Figures 26 to 29 The guide plate 40 separates the ejector channel 108 and the cover 30, and there is a gap between the guide plate 40 and the cover 30. This further improves the uniformity of airflow. Specifically, as the airflow is sent from the outlet 102 of the ejector 10 to the cavity 20, it is blocked by the guide plate 40 and flows to the cover 31 through the vent 401 on the guide plate 40. By setting the guide plate 40, the airflow to the cover 30 can be made uniform, improving the uniformity of airflow to the cover 30, thereby reducing the emissions of nitrogen oxides and carbon monoxide.

[0121] The guide plate has multiple vents, which may be the same size or at least partially different in size. For example, the airflow can be homogenized by varying the shape, size, and density of the vents. For instance, the size of the vents on the guide plate opposite the area with higher airflow velocity can be designated as S1, and the size of the vents on the guide plate opposite the area with lower airflow velocity can be designated as S2. S1 can be set smaller than S2, or, depending on the specific circumstances, S1 can be set larger than S2. This is merely one specific embodiment of the invention and not a limitation on its scope. In this invention, airflow homogenization can also be achieved by varying the shape and density of the vents. Furthermore, the size, shape, and density of the vents at various points on the guide plate can be made identical.

[0122] Optionally, such as Figure 18 , Figure 19 , Figure 26 as well as Figure 27 The ejector channel 108 extends along a third direction and is connected at one end to the air inlet 101. An air outlet 102 is formed on one side of the ejector channel 108 along a second direction. The guide plate 40 is opposite to the end of the ejector channel 108 furthest from the air inlet 101. The second direction and the third direction are perpendicular. That is, airflow can flow along the ejector channel 108 along the second direction. After entering the mapping channel, the airflow will flow towards the air outlet 102 of the ejector channel 108. Most of the airflow will flow towards the air outlet 102 after reaching the end of the ejector channel 108 furthest from the air inlet 101. This will result in a difference in the airflow velocity delivered into the cavity 20 from the ejector channel 108. Furthermore, by making the extension direction of the ejector channel 108 perpendicular to the air outlet direction, the uniformity of air delivery can be improved, and air intake and exhaust can be facilitated, thus improving the uniformity of airflow and facilitating air supply.

[0123] In this invention, the air outlet 102 of the ejector channel 108 can be a long strip shape extending in a third direction.

[0124] like Figure 18 and Figure 19 In some embodiments of the present invention, the inner surface of the ejector channel 108 at the end furthest from the air inlet 101 is constructed as an arc-shaped surface, with the opening of the arc-shaped surface facing the air inlet 101. This allows the airflow to flow smoothly from a third direction toward a second direction, improving the stability of the airflow. When the airflow flows along the arc-shaped surface, the flow rate and velocity of the airflow exiting from the edge of the arc-shaped surface are relatively large. Therefore, this location constitutes a high-speed air outlet. A guide plate 40 can be positioned at this location, with the guide plate 40 opposite to the entire air outlet 102, effectively homogenizing the airflow and mixing effect within the cavity 20.

[0125] Optionally, the guide plate 40 is disposed adjacent to the cover 30.

[0126] Optionally, such as Figure 16 As shown, the burner 100 includes a plurality of ejectors 10 arranged side by side along a first direction. A cavity 20 is connected to the plurality of ejectors 10. A partition 23 is provided inside the cavity 20, which divides the cavity 20 into a plurality of distribution chambers corresponding to the plurality of ejectors 10. One end of each distribution chamber is connected to the air outlet 102 of the ejector channel 108 of the corresponding ejector 10, and the other end of the distribution chamber faces the cover 30 to discharge air. By providing a plurality of ejectors 10, the uniformity of the airflow delivered to the cavity 20 can be improved, effectively improving the uniform combustion effect. Furthermore, by providing the partition 23 and constructing the distribution chambers, the uniformity of the airflow can be further improved.

[0127] Optionally, combined Figures 16 to 29 The guide plate 40 includes multiple guide sections 402 and embedding sections 403 connecting the multiple guide sections 402. The guide sections 402 are spaced apart from the cover 30, and the multiple guide sections 402 are respectively opposite to the ejector channels 108 of the multiple ejectors 10. One side of the embedding section 403 protrudes towards the cover 30, and the other side forms an embedding groove 404. The edge of the separator 23 is embedded in the embedding groove 404. When the embedding section 403 protrudes towards the cover 30, the embedding section 403 can abut against the surface of the cover 30, or a predetermined gap can be provided between the embedding section 403 and the cover 30. The embedding section 403 can serve as an extension of the separator 23. The internal space of the cavity 20 is separated by the cooperation between the embedding section 403 and the separator 23, thereby improving the uniformity of airflow. By providing the embedding groove 404, the separator 23 can be easily embedded, and the stability of the separator 23 and the guide plate 40 can be improved.

[0128] Optionally, combined Figures 23-25The separator 23 is constructed with a U-shaped cross-section, and the closed end of the separator 23 is provided with an air outlet 231. The edge of the air outlet 231 is provided with a mating flange 51 that is inserted into the air outlet 102 of the ejector channel 108. This further improves the stability of the separator 23 and allows the airflow to flow stably between the ejector channel 108 and the distribution chamber, thereby improving the airflow effect.

[0129] Optionally, the flange 51 is provided with a positioning groove, and the inner side of the air outlet 102 of the ejector 10 is provided with a positioning protrusion embedded in the positioning groove. By setting the positioning groove and the positioning protrusion, a stable fit between the flange 51 and the ejector 10 can be achieved, which facilitates the positioning of the separator 23 and the ejector 10, optimizes the fit structure, and improves airflow stability.

[0130] Optionally, combined Figure 16 and Figure 17 The cover 30 includes a cover plate 31 and a metal mesh 32. A connecting flange 21 is provided around the other end of the cavity 20. The metal mesh 32 is supported on the connecting flange 21. The cover plate 31 covers the outside of the metal mesh 32, and a limiting flange 53 is provided around the periphery of the cover plate 31, which clamps the metal mesh 32 and the connecting flange 21. By providing the metal mesh 32, the uniformity of airflow can be effectively improved, allowing the airflow inside the cavity 20 to be evenly delivered through the cover 30. By providing the connecting flange 21 and the limiting flange 53, the connection between the cover 30 and the cavity 20 can be effectively improved, enhancing the stability of the connection.

[0131] Optionally, one end of the cavity 20 is provided with a mating hole 202, and the edge of the mating hole 202 is provided with a first positioning flange 222 that is inserted into the air outlet 102 of the ejector channel 108. This further improves the stability of the connection between the cavity 20 and the ejector 10.

[0132] The aforementioned second direction, third direction, and first direction can be perpendicular to each other. The second direction can be up and down, the third direction can be front and back, and the first direction can be left and right. Of course, this is merely a clear illustration of this application based on the accompanying drawings and is not intended to limit the scope of protection of this invention.

[0133] A specific embodiment of the burner 100 according to the present invention is described below with reference to the accompanying drawings.

[0134] like Figures 1-15 As shown, the burner 100 includes a cavity 20, a plurality of ejectors 10, a cover 30, a guide plate 40, and a plurality of fasteners 50.

[0135] The cavity 20 is roughly rectangular in shape. The length of the cavity 20 extends in the left-right direction, the height of the cavity 20 extends in the up-down direction, and the width of the cavity 20 extends in the front-back direction. The upper outer periphery of the cavity 20 is provided with an outwardly bent connecting flange 21. The connecting flange 21 is provided with a plurality of connecting holes 211 arranged at intervals along its extension direction. Each connecting hole 211 has a second positioning flange 221 extending downward along its edge. The bottom of the cavity 20 is provided with a plurality of mating holes 202 arranged at intervals along its length direction. Each mating hole 202 has a first positioning flange 222 extending downward along its edge.

[0136] A distribution cavity is defined within the cavity 20. Multiple partitions 23 are spaced apart along the length of the distribution cavity. Each partition 23 extends in the front-to-back direction, dividing the inner cavity (distribution cavity) of the cavity 20 into multiple distribution cavities 204. Each partition 23 includes two vertical partitions 232 and a horizontal partition 233. The two ends of the horizontal partition 233 are connected to the lower ends of the two vertical partitions 232, respectively. An air vent 231 extending in the front-to-back direction is provided on the horizontal partition 233. Specifically, one distribution cavity 204 is defined between the two vertical partitions 232 of each partition 23, and one distribution cavity 204 is defined between the vertical partitions 232 of two adjacent partitions 23. The leftmost and rightmost partitions 23 each define a distribution cavity between themselves and the inner wall of the cavity 20.

[0137] Multiple ejectors 10 are arranged at intervals along the left-right direction. Each ejector 10 has an ejection channel 108. Each ejector 10 has an air inlet 101 on its front side and an air outlet 102 at its upper end. Both the air inlet 101 and the air outlet 102 are connected to the ejection channel 108. Specifically, as shown... Figure 5 As shown, the ejector channel 108 includes a first channel 1081, a second channel 1082, and a third channel 1083 arranged in the vertical direction. The second channel 1082 is located above the first channel 1081 and below the third channel 1083. The first channel 1081 extends horizontally, with one end connected to the air inlet 101 and the other end of the first channel 1081 connected to one end of the second channel 1082 via an arc transition. The second channel 1082 can extend horizontally, or it can extend upwards at an angle away from the first channel 1081. The third channel 1083 extends horizontally and is connected to the second channel 1082, thereby forming an S-shape in the ejector channel 108.

[0138] The cover 30 is roughly a rectangular plate. The length of the cover 30 extends in the left-right direction, and the width of the cover 30 extends in the front-back direction. The cover 30 has multiple venting areas 301 arranged in the left-right direction. Each venting area 301 is provided with multiple venting holes 302 arranged at intervals. The outer periphery of the cover 30 is provided with a downwardly bent portion 303.

[0139] The guide plate 40 is a roughly rectangular plate. The length of the guide plate 40 extends in the left-right direction, and the width of the guide plate 40 extends in the front-back direction. The guide plate 40 has multiple ventilation zones 4011 arranged in the left-right direction, and each ventilation zone 4011 is provided with multiple ventilation holes 401 arranged at intervals. The guide plate 40 includes multiple flow guides 402 and multiple embeddings 403. The multiple flow guides 402 are arranged at intervals in the left-right direction, and the multiple embeddings 403 are arranged at intervals in the left-right direction. Adjacent flow guides 402 are connected by embeddings 403, and adjacent embeddings 403 are connected by flow guides 402. Multiple vent holes 401 are provided on the flow guides 402. The flow guides 402 can form a horizontal plate segment 4021, or a first plate segment 4022 and a second plate segment 4023 connected to each other. The first plate segment 4022 and the second plate segment 4023 extend obliquely toward the air outlet 102 in a direction close to each other. The embeddings 403 define an embedding groove 404 with the opening facing downward.

[0140] During installation, multiple ejectors 10 are positioned below the cavity 20, with their outlets 102 corresponding to the mating holes 202 of the cavity 20. A guide plate 40 is positioned above the cavity 20, with its ventilation zones 4011 corresponding to the positions of the distribution chambers 204. A cover 30 is placed over the guide plate 40, with its outlet zones 301 corresponding to the positions of the ventilation zones 4011.

[0141] Specifically, the connecting flange 21 of the cavity 20 is provided with a plurality of connecting holes 211 arranged at intervals along its circumference. The guide plate 40 is disposed at the upper end of the cavity 20. The outer periphery of the guide plate 40 is provided with a plurality of through holes arranged at intervals along its circumference. The positions of the plurality of through holes correspond one-to-one with the positions of the plurality of connecting holes 211. The cover 30 covers the top of the guide plate 40. The cover 30 is provided with a plurality of through holes arranged at intervals along its circumference. The positions of the plurality of through holes correspond one-to-one with the positions of the plurality of through holes. Each fastener 50 can sequentially pass through the through holes on the cover 30, the through holes on the guide plate 40, and the connecting holes 211 on the connecting flange 21, thereby connecting the cavity 20, the guide plate 40, and the cover 30 together.

[0142] During operation, gas enters the ejector channel 108 through the inlet 101 and exits through the outlet 102, being delivered to the cavity 20. The ejector channel 202 is used to eject a mixture of fuel gas and air into the cavity 201. The fuel gas and air are thoroughly mixed in the distribution cavity 204. As the mixture passes through the guide plate 40, it is homogenized to a certain extent, allowing the airflow to reach the cover 30 more evenly, effectively improving the uniformity of the airflow and achieving low emissions of nitrogen oxides.

[0143] In summary, the burner 100 of this application has a simple structure and a simple and reliable manufacturing process. It can make maximum use of the space inside the cavity 20, increase the area occupied by the gas outlet zone 301, that is, increase the combustion area, reduce the combustion heat intensity, thereby making the flame more uniform and the combustion noise lower, increasing the adaptability of the burner 100. While ensuring combustion performance, the external size of the burner 100 can be reduced, thus reducing costs.

[0144] Another specific embodiment of the burner 100 according to the present invention is described below with reference to the accompanying drawings.

[0145] like Figures 16-29 As shown, the burner 100 of this application embodiment includes an ejector 10, a cavity 20, a cover 30, and a guide plate 40.

[0146] The ejector 10 includes multiple ejectors arranged side-by-side in a left-right direction, each ejector 10 having an ejector channel 108. A cavity 20 is mounted above the multiple ejectors 10, and the cavity 20 defines a mixing chamber 201. The upper end of each ejector 10 is connected to the cavity 20, and the outlets of the multiple ejectors 10 are connected to the mixing chamber 201. "Multiple" refers to two or more ejectors; however, in this invention, only one ejector 10 may be used. In this invention, gas enters the ejector channel 108 through the inlet 101 and flows out through the outlet 102 of the ejector channel 108, being delivered to the cavity 20. The ejector channel 108 is used to eject a mixture of fuel gas and air into the mixing chamber 201. After the fuel gas and air are fully mixed in the mixing chamber 201, they are discharged through the cover 30 above the cavity 20. In this invention, due to uneven airflow velocity and flow rate when the air enters the mixing chamber 201, excessively high velocity in some areas can easily lead to incomplete combustion. Therefore, to improve combustion performance, a guide plate 40 is provided to homogenize the airflow within the chamber 20, effectively improving combustion efficiency and achieving low nitrogen oxide emissions. According to the burner 100 of this application embodiment, by providing multiple ejectors 10 to eject gas and air into the chamber 20, the efficiency of air ejection into the mixing chamber 201 can be improved, solving the problem of insufficient primary air intake in burners 100 in related technologies. The mixing effect of gas and air in the mixing chamber 201 is good, and the ejection capacity and ejection coefficient of the burner 100 are high, thereby increasing the combustion heat intensity and heat load of the burner 100.

[0147] The cavity 20 can be formed by bending. The cavity 20 includes a first sidewall, a bottom wall, and a second sidewall connected in sequence. The first and second sidewalls are arranged opposite each other in a first direction (i.e., the left-right direction in the figure). Therefore, the cavity 20 has a simple structure and is easy to manufacture, reducing manufacturing costs. Optionally, the cavity 20 also includes two end plates, a first end plate and a second end plate, arranged opposite each other in a third direction (i.e., the front-back direction in the figure). Both the first and second end plates have corresponding mounting through holes for inserting cooling pipes. The bottom of the cavity 20 has mating holes 202. Each mating hole 202 has a first positioning flange 222 along its edge. The first positioning flange 222 extends into the inner wall of the ejector 10's outlet 102 and is spot-welded.

[0148] The cavity 20 is also provided with a partition 23, which is constructed in a U-shaped cross-section. The bottom of the partition 23 is provided with an air passage 231, and the edge of the air passage 231 is provided with a mating flange 51. The mating flange 51 is adapted to be inserted into the air outlet 102 of the ejector 10 and spot welded together. In the left-right direction, one of every two adjacent ejectors 10 is connected to the partition 23. The mating flange 51 on the partition 23 is inserted into the air outlet 102 of the corresponding ejector 10. The mating flange 51, the first positioning flange 222, and the air outlet 102 of the ejector 10 are stacked in sequence and spot welded together in at least two layers. The upper edge of the cavity 20 is provided with an outwardly bent connecting flange 21. The metal mesh 32 rests on the connecting flange 21, and the cover plate 31 covers the outside of the metal mesh 32. The periphery of the cover plate 31 is provided with a limiting flange 53. The cross-section of the cover plate 31 is constructed as a U-shaped ring with an opening facing inward. The periphery of the cover plate 31 holds the connecting flange 21 and the metal mesh 32 to achieve the positioning and installation of the metal mesh 32. The cover plate 31 is a hollow annular structure or is provided with a grid shape.

[0149] like Figure 18 , Figure 19 , Figure 26 as well as Figure 27 As shown, the ejector channel 108 includes a first section and a second section connected together. The first section is arranged in the front-to-back direction, and its free end forms the air inlet 101 of the ejector channel 108. The second section forms an angle with the first section, and its top is open to form the air outlet 102 of the ejector channel 108. The connection between the first and second sections is smoothly transitioned. The angle between the second and first sections is an acute angle, which allows for a further reduction in the height dimension of the ejector 10 and an increase in the length of the ejector channel 108, thereby improving the air-fuel mixing effect while reducing the size of the ejector 10.

[0150] Optionally, the maximum dimension of the ejector channel 108 in the height direction (i.e., the vertical direction in the figure) is smaller than its maximum dimension in the length direction (i.e., the front-to-back direction in the figure). This allows for a further reduction in the dimension of the ejector 10 in the height direction, thereby reducing the overall height of the burner 100 and improving its applicability.

[0151] The guide plate 40 is provided with a plurality of vent holes 401 arranged at intervals. The plurality of vent holes 401 are arranged in multiple rows at intervals along the front-back direction, and each row includes at least one vent hole 401.

[0152] Additionally, the burner 100 may include a cooling pipe that passes through the mounting cavity, with its outer wall surface fitting against the inner wall surface of the mounting cavity. The cooling pipe may include multiple pipe bodies connected end-to-end, each pipe body passing through a corresponding mounting cavity.

[0153] Optionally, combined Figure 20 , Figure 21 , Figure 28 as well as Figure 29 In this invention, the multiple vents on the guide plate can be of the same size, or they can be configured to have different sizes. For example, the vent size of the portion of the guide plate opposite to the high-speed air outlet position is smaller than the vent size at other positions; or the vent size of the portion of the guide plate opposite to the high-speed air outlet position is smaller than the vent size at other positions. The size of the vents on the guide plate can also be configured to gradually change. For example, the size of the vents on the guide plate gradually increases or decreases from the portion opposite to the high-speed air outlet position to other positions on the guide plate.

[0154] Furthermore, in this invention, the multiple vents on the guide plate can have the same density, or they can be configured with different densities. For example, the density of vents on the portion of the guide plate opposite to the high-speed air outlet position is lower than the density of vents at other positions; or the density of vents on the portion of the guide plate opposite to the high-speed air outlet position is lower than the density of vents at other positions. The density of the vents on the guide plate can also be configured to gradually change. For example, the density of vents on the portion of the guide plate opposite to the high-speed air outlet position gradually increases or gradually decreases from the vents at other positions on the guide plate.

[0155] The following description, in conjunction with the accompanying drawings, describes a gas water heater according to an embodiment of the present invention.

[0156] A gas water heater according to an embodiment of the present invention includes the burner 100 as described above.

[0157] According to an embodiment of the present invention, the gas water heater, by providing the aforementioned burner 100, can effectively improve the uniformity of airflow to achieve low emissions of nitrogen oxides, etc. The burner 100 has a uniform flame, low combustion noise, wide adaptability, stable combustion performance, better flue gas emission indicators, and lower emissions of carbon monoxide and nitrogen oxides, and can reduce the size and reduce costs.

[0158] In this invention, a multi-horizontal ejector 10 air intake structure design is adopted, which improves the ejector 10 capacity of the burner 100. The combustion surface adopts an integral metal mesh 32 structure to maximize the use of the cavity 20 space, which can realize low-emission water heaters of various specifications. An airflow guide plate 40 is added at the position of the cavity 20 where the airflow speed is relatively fast, which makes the combustion more uniform, the performance more stable, and the flue gas emission index better.

[0159] This invention features a U-shaped separator 23 within the cavity 20, ensuring uniform distribution of the intake gas mixtures without interference and enabling segmented combustion. The cover plate 31 includes a support structure for the metal mesh 32, reducing mesh deformation after heating. The cover plate 31 and cavity 20 utilize a partially interlocking structure, simplifying the connection. The AB sheet of this invention employs an integral structure, reducing the number of parts required for machining.

[0160] In this invention, the burner is equipped with multiple ejectors 10, which can greatly improve the overall combustion capacity. The structure of the metal mesh 32 is simple, easy to manufacture, low in cost, and highly adaptable. It can not only reduce nitrogen oxide emissions, but also increase heat load, improve the quality and performance of gas water heaters, and meet production and usage requirements. It has positive significance for the development of various low-emission water heater products.

[0161] The burner 100 of this invention is applicable to various gas appliances, especially various forced draft gas water heaters. This invention employs multiple ejector air intake structures combined with an integral metal mesh 32 structure combustion surface, maximizing the utilization of the cavity 20 space, increasing the overall heat load of the burner 100, and improving its adaptability; in the position where the airflow velocity in the cavity 20 is relatively fast ( Figure 18 An airflow guide plate 40 is added to the upper left of the cavity 20 to make combustion more even. A U-shaped partition 23 structure is provided inside the cavity 20 to achieve segmented combustion. The cover plate 31 is provided with horizontal and vertical support structures connected to the metal mesh 32. The cover plate 31 and the cavity 20 are provided with a partial fastening structure.

[0162] In the description of this invention, it should be understood that the terms "center," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0163] Other configurations and operations of the gas water heater according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0164] 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.

[0165] 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 burner, characterized in that, include: A cavity having a plurality of distribution cavities arranged along a first direction; Multiple ejectors, wherein the multiple ejectors are arranged side by side along the first direction and connected to one end of the cavity in the second direction; A cover, wherein the cover is disposed at the other end of the cavity in the second direction. Each ejector has an ejector channel, one end of the distribution cavity is connected to the air outlet of the ejector channel of the corresponding ejector, and the other end of the distribution cavity is directed to the cover to discharge air. The cover has multiple air outlet areas, and each of the multiple air outlet areas corresponds to a multiple of the multiple distribution chambers. Each air outlet area is provided with multiple air outlet holes arranged at intervals. The cover includes: A cover plate, wherein the cover plate is provided with a plurality of spaced-apart mounting openings; A metal mesh is sandwiched between the cover plate and the cavity and covers a plurality of the mounting ports, and a plurality of the air vents are formed on the metal mesh.

2. The burner according to claim 1, characterized in that, Each of the vents forms an elongated hole extending along the first direction, and in each venting area, at least a portion of the plurality of vents are spaced apart along a third direction.

3. The burner according to claim 2, characterized in that, In the third direction, a plurality of air outlets located in the middle are arranged at intervals along the first direction and the third direction, and a plurality of air outlets located on both sides are arranged alternately in the third direction.

4. The burner according to claim 2, characterized in that, The plurality of air outlets are designated as first air outlets and second air outlets, and each air outlet zone is provided with a plurality of first hole groups. The plurality of first hole groups are arranged at intervals along the first direction, and each first hole group includes a plurality of first air outlets and the plurality of first air outlets are arranged at intervals along the third direction.

5. The burner according to claim 4, characterized in that, Each of the air outlet zones is provided with two second hole groups, which are arranged at intervals along the third direction and located on both sides of the first hole group. The second hole group includes a plurality of first air outlets and a plurality of second air outlets. The plurality of second air outlets are arranged at intervals along the third direction, and a plurality of first air outlets are arranged at intervals along the first direction between two adjacent second air outlets.

6. The burner according to claim 4, characterized in that, The length of the second vent in the first direction is greater than the length of the first vent in the first direction.

7. The burner according to claim 2, characterized in that, The first direction, the second direction, and the third direction are perpendicular to each other.

8. The burner according to claim 1, characterized in that, The other end of the cavity is provided with a connecting flange, the metal mesh is supported on the connecting flange, the cover plate covers the outside of the metal mesh, and the periphery of the cover plate is provided with a limiting flange, the limiting flange clamps the metal mesh and the connecting flange.

9. The burner according to claim 1, characterized in that, The cover is a one-piece molded part.

10. The burner according to claim 1, characterized in that, The outer periphery of the cover is provided with a bent portion, which surrounds the cavity.

11. The burner according to any one of claims 1-10, characterized in that, Also includes: A guide plate is disposed in the cavity and opposite to the air outlet of the ejector channel. The guide plate is provided with vent holes so that the airflow delivered by the ejector channel can be evenly directed to the cover.

12. The burner according to claim 11, characterized in that, The guide plate is located between the cavity and the cover. The guide plate has multiple ventilation zones arranged along the first direction. Each ventilation zone corresponds to an air outlet of a multiple ejector channel. Each ventilation zone is provided with multiple vent holes arranged at intervals.

13. The burner according to claim 12, characterized in that, The outer periphery of the guide plate is sandwiched between the cavity and the cover and connected together by a plurality of fasteners.

14. The burner according to claim 12, characterized in that, The guide plate includes a plurality of flow guides spaced apart along the first direction. The plurality of flow guides are respectively opposite to the ejector channels of the plurality of ejectors. The flow guides are located in the distribution cavity and spaced apart from the cover. The ventilation area is located in the flow guide.

15. The burner according to claim 14, characterized in that, The flow guide section forms a horizontal plate segment.

16. The burner according to claim 14, characterized in that, The flow guide includes a first plate segment and a second plate segment arranged and connected along the first direction. The first plate segment and the second plate segment extend obliquely toward the air outlet in a direction close to each other, and a plurality of the air vents are provided on the first plate segment and the second plate segment.

17. The burner according to claim 14, characterized in that, The two adjacent flow guides are connected by an insert, one side of which protrudes towards the cover and the other side has an insert groove. The cavity is provided with multiple partitions, which divide the inner cavity of the cavity into multiple distribution cavities, and the edges of the partitions are embedded in the embedding grooves.

18. The burner according to claim 17, characterized in that, Each of the partitions includes: Two vertical partitions are arranged at intervals along the first direction, with one end of each vertical partition abutting against the inner wall of the cavity and the other end engaging with the embedding groove; A horizontal partition, the two ends of which are respectively connected to the two vertical partitions, and the horizontal partition is provided with an air outlet connecting the distribution chamber and the air outlet.

19. The burner according to claim 11, characterized in that, The guide plate includes a shielding part and an inclined part. There is a gap between the shielding part and the cover, and the shielding part is opposite to the high-speed air outlet position of the ejector channel. The inclined part is connected to the shielding part and is inclined toward the cover.

20. The burner according to claim 11, characterized in that, The guide plate separates the ejector channel and the cover, and there is a gap between the guide plate and the cover.

21. The burner according to claim 11, characterized in that, The ejector channel extends along a third direction and is connected to an air inlet at one end. An air outlet is formed on one side of the ejector channel along the second direction. The guide plate is opposite to the end of the ejector channel away from the air inlet. The second direction and the third direction are perpendicular.

22. The burner according to claim 21, characterized in that, The inner surface of the ejector channel at the end away from the air inlet is configured as an arc-shaped surface, and the opening of the arc-shaped surface faces the air inlet.

23. The burner according to claim 11, characterized in that, One end of the cavity is provided with a mating hole, and the edge of the mating hole is provided with a first positioning flange that inserts into the air outlet of the ejector channel; and / or, The guide plate is provided with a plurality of vent holes, wherein the plurality of vent holes are of the same size or at least some of the plurality of vent holes are of different sizes.

24. A gas-fired water heater, characterized in that, Includes the burner according to any one of claims 1-23.

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