Fire grate, burner and gas water heating apparatus

Abstract

This utility model relates to the field of water heater technology, and more particularly to a burner and a flame grid. The burner has a separated gas chamber and a secondary air flow channel. The top of the burner has multiple groups of flame holes communicating with the gas chamber and multiple air supply holes communicating with the secondary air flow channel. Each group of flame holes includes multiple flame holes. These groups of flame holes are spaced apart along the length of the burner, and an air supply hole is located between adjacent groups of flame holes. The burner includes the aforementioned burner. Because an air supply hole is located between adjacent groups of flame holes, the secondary air flow channel directly supplies secondary air to the flame within the burner, increasing the amount of secondary air supplied. Simultaneously, the multiple air supply holes evenly supply air to the adjacent groups of flame holes, achieving uniform secondary air supply and effectively stabilizing the flame.

Description

Technical Field

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

[0002] As the thickness and / or width of gas water heaters decrease, higher demands are placed on burners and flame bars. Flame bars need to achieve better combustion efficiency and flame stability within a smaller space. In related technologies, secondary air channels are set between adjacent flame bars to supply secondary air to the flame and stabilize it. However, when secondary air is supplied from both sides of the flame bar in the width direction, the spacing between the flame bars is too small due to the need to balance combustion efficiency and the compact size of the burner. This causes the secondary air velocity to be too fast and forms a natural wind barrier, resulting in insufficient and uneven supply of secondary air to the flame, thus failing to achieve the desired flame stabilization effect. Utility Model Content

[0003] One of the technical problems solved by this invention is to provide a burner that can effectively improve combustion efficiency.

[0004] The second technical problem solved by this utility model is to provide a burner that can effectively solve the technical problems of insufficient and uneven air supply in the secondary air flow channel between adjacent burners in the prior art.

[0005] The third technical problem solved by this utility model is to provide a gas-fired water heater that can effectively solve the technical problems of insufficient gas supply and uneven gas supply in the secondary air flow channel between adjacent burners in the prior art.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A burner has a separate gas chamber and a secondary air flow channel. The top of the burner has a plurality of burner hole groups communicating with the gas chamber and a plurality of air supply holes communicating with the secondary air flow channel. Each burner hole group includes a plurality of burner holes. The plurality of burner hole groups are spaced apart along the length of the burner, and the air supply holes are provided between two adjacent burner hole groups.

[0008] Compared with the prior art, the firebox described in this utility model has the following beneficial effects: Because a supplementary air hole is provided between two adjacent fire hole groups along the length of the firebox, air at the bottom of the firebox can flow directly to the supplementary air hole through the secondary air flow channel. This provides secondary air supplementation for the flame combustion on both sides of the supplementary air hole, improving combustion completeness and avoiding or alleviating the problems of insufficient and uneven supplementary air caused by the existing burner requiring secondary air to flow through the gap between two adjacent fireboxes to the top of the firebox for supplementary air. Simultaneously, because a supplementary air hole is provided between two adjacent fire hole groups, the supplementary air hole and the fire hole groups are staggered along the length of the firebox. This satisfies the requirement of supplementing air for combustion at the fire hole in any fire hole group while reducing the interference of the supplementary air flow from the supplementary air hole on the flow of the mixed gas from the fire hole, ensuring the stability of the mixed gas flowing out of the fire hole, thereby improving the combustion stability at the fire hole.

[0009] In one embodiment, the gas chamber includes a plurality of gas sub-chambers spaced apart along the width of the burner; in each of the plurality of burner holes in each burner hole group, each gas sub-chamber is connected to at least one burner hole.

[0010] In one embodiment, a secondary air flow channel is provided between two adjacent gas sub-cavities, and a plurality of air replenishment holes are provided at the top of the burner corresponding to each of the secondary air flow channels.

[0011] In one embodiment, the secondary airflow channel includes a pressure stabilizing chamber and an air intake channel arranged vertically. The pressure stabilizing chamber extends along the length of the burner, and multiple air intake channels are spaced apart along the length of the burner. The lower end of each air intake channel is connected to the external environment, and the upper end is connected to the pressure stabilizing chamber. The air replenishment hole is connected to the pressure stabilizing chamber.

[0012] In one embodiment, the secondary air flow channel further includes an air outlet channel located above the pressure stabilizing chamber. Multiple air outlet channels are spaced apart along the length of the burner. The lower end of each air outlet channel is connected to the pressure stabilizing chamber, and the upper end extends through the top of the burner to form the air replenishment hole.

[0013] In one embodiment, the air intake passage and the air outlet passage are at least partially misaligned in the height direction of the firebox.

[0014] In one embodiment, the air intake passage has a lower flared portion extending upward from the air intake port, the width of the lower flared portion gradually increasing from top to bottom in the length direction of the burner.

[0015] And / or, the air intake passage has an upper flare extending downward from the air outlet, the width of which gradually increases from bottom to top along the length of the burner.

[0016] In one embodiment, the gas chamber includes three gas sub-chambers, namely a middle sub-chamber and two side sub-chambers located on opposite sides of the middle sub-chamber. The top of the burner has a middle burner plate covering the middle sub-chamber and two side burner plates covering the upper ends of the two side sub-chambers respectively. Multiple burner holes of each burner hole group are distributed on the middle burner plate and the two side burner plates. The gas supply hole is disposed between the side burner plate and the middle burner plate.

[0017] In one embodiment, in each of the burner groups, the burner holes on the intermediate burner plate constitute an intermediate burner subgroup, and the burner holes on each of the side burner plates constitute a side burner group, wherein the number of burner holes in the side burner groups is greater than the number of burner holes in the intermediate burner groups; the air supply hole is relatively close to the burner holes on the side burner plates.

[0018] In one embodiment, each of the side flame hole subgroups includes a first flame hole unit and a second flame hole unit arranged side by side and facing each other along the width direction of the flame bar. The first flame hole unit is arranged close to the middle flame plate relative to the second flame hole unit. Both the first flame hole unit and the second flame hole unit include a plurality of flame holes spaced apart along the length direction of the flame bar. Along the length direction of the flame bar, the air supply hole is directly opposite the first flame hole unit.

[0019] In one embodiment, along the length of the burner, the burner hole distribution area of ​​the second burner hole unit is larger than that of the first burner hole unit. The outer contour of the air supply hole on the side burner plate is a first trapezoid, and the two parallel sides of the first trapezoid extend along the length of the burner hole, with the shorter side of the two parallel sides being away from the middle burner plate.

[0020] In one embodiment, the two side flame plates are located on both sides of the intermediate flame plate and are inclined upward relative to the intermediate flame plate so that the top of the flame plate has a recessed structure.

[0021] In one embodiment, along the height direction of the fire bar, the two side fire plates are higher than the middle fire plate and are arranged parallel to the middle fire plate, so that the top of the fire bar has a recessed structure.

[0022] In one embodiment, the gas chamber includes three gas sub-chambers, namely a middle sub-chamber and two side sub-chambers. The burner includes an inner shell and two outer shells disposed on opposite sides of the inner shell along its width. The inner shell has a communicating ejector channel and the middle sub-chamber. Each outer shell has a side sub-chamber that communicates with the ejector channel. Multiple burner holes of each burner hole group are distributed at the top of the inner shell and the two outer shells. The opposite sides of the inner shell and the two outer shells are surrounded to form the secondary air flow channel and the air supply hole.

[0023] In one embodiment, the ejector channel is provided, and both of the side chambers are connected to the intermediate chamber, so that a portion of the mixed gas in the intermediate chamber is diverted to the two side chambers.

[0024] In one embodiment, the outer casing has an air inlet that communicates with the side cavity.

[0025] The second technical problem mentioned above is solved by the following technical solution:

[0026] A burner comprising the aforementioned burner vent.

[0027] Compared with the prior art, the burner described in this utility model has the following beneficial effects:

[0028] Because there are air supply holes between two adjacent flame hole groups, the secondary air flow channel directly supplies secondary air to the flame in the flame bar, increasing the amount of secondary air supplied. At the same time, through multiple air supply holes, air is evenly supplied to the flame hole groups adjacent to the air supply holes, achieving uniform air supply and effectively stabilizing the flame.

[0029] The third technical problem mentioned above is solved by the following technical solution:

[0030] A gas-fired hot water device includes the burner described above.

[0031] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages:

[0032] Because there are air supply holes between two adjacent flame hole groups, the secondary air flow channel directly supplies secondary air to the flame in the flame bar, increasing the amount of secondary air supplied. At the same time, through multiple air supply holes, air is evenly supplied to the flame hole groups adjacent to the air supply holes, achieving uniform air supply and effectively stabilizing the flame. Attached Figure Description

[0033] Figure 1 This is a top view of the fire rack provided in Embodiment 1 of this utility model;

[0034] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0035] Figure 3 This is a longitudinal sectional view of the fire bar provided in Embodiment 1 of this utility model;

[0036] Figure 4 This is an exploded view of the structure of the fire bar provided in Embodiment 1 of this utility model;

[0037] Figure 5 This is a partial structural schematic diagram of the outer shell provided in Embodiment 1 of this utility model;

[0038] Figure 6 This is a schematic diagram of the structure of the fire rack provided in Embodiment 2 of this utility model;

[0039] Figure 7 yes Figure 6 A magnified view of a section at point B.

[0040] The component names and labels in the diagram are as follows:

[0041] 1. Inner shell; 11. Intermediate fire plate; 12. Injector channel; 13. First through hole;

[0042] 2. Outer shell; 21. Side fire plate; 22. First boss portion; 221. Second through hole; 222. Air intake hole; 23. First recess portion; 24. Second boss portion; 25. Second recess portion;

[0043] 3. Gas chamber; 31. Gas sub-chamber; 31a. Intermediate sub-chamber; 31b. Side sub-chamber;

[0044] 4. Flame hole group; 41. Middle flame hole group; 42. Side flame hole group; 421. First flame hole unit; 422. Second flame hole unit;

[0045] 5. Secondary airflow channel; 51. Intake channel; 511. Upper flare; 512. Middle intake; 513. Lower flare; 52. Pressure stabilizing chamber; 53. Exhaust channel;

[0046] 6. Air inlet. Detailed Implementation

[0047] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0048] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0051] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0052] Example 1

[0053] This embodiment provides a burner that can be applied to a burner to improve the combustion stability and efficiency of the burner and reduce harmful substances produced during combustion.

[0054] like Figures 1 to 5 As shown, in this embodiment, the burner is provided with a separate gas chamber 3 and a secondary air channel 5. The top of the burner is provided with a plurality of burner hole groups 4 communicating with the gas chamber 3 and a plurality of air supply holes 6 communicating with the secondary air channel 5. Each burner hole group 4 includes a plurality of burner holes. Along the length of the burner, the plurality of burner hole groups 4 are spaced apart, and an air supply hole 6 is provided between two adjacent burner hole groups 4.

[0055] The burner provided in this embodiment has a supplementary air hole 6 between two adjacent burner hole groups 4 along its length. This allows air at the bottom of the burner to flow directly to the supplementary air hole 6 through the secondary air flow channel 5, thereby supplementing the flame combustion on both sides of the supplementary air hole 6 with secondary air, improving combustion completeness, and avoiding or alleviating the problems of insufficient and uneven supplementary air caused by the existing burner's secondary air flowing through the gap between two adjacent burners to the top of the burner for supplementary air. At the same time, since the supplementary air hole 6 is provided between two adjacent burner hole groups 4, the supplementary air hole 6 and the burner hole groups 4 are staggered along the length of the burner. This satisfies the need to supplement the combustion at the burner hole in any burner hole group 4 while reducing the interference of the supplementary air flow from the supplementary air hole 6 on the flow of the mixed gas from the burner hole, ensuring the stability of the mixed gas flowing out of the burner hole, and thus improving the combustion stability at the burner hole.

[0056] In one embodiment, the gas chamber 3 includes a plurality of gas sub-chambers 31 spaced apart along the width of the burner. In each burner hole group 4, each gas sub-chamber 31 is connected to at least one burner hole. By providing a plurality of gas sub-chambers 31, the gas flow in the burner is diverted and rectified, thereby improving the stability of flame combustion.

[0057] In one embodiment, a secondary air flow channel 5 is provided between each two adjacent gas sub-cavities 31, and multiple air supply holes 6 are provided at the top of the burner corresponding to each secondary air flow channel 5. This arrangement allows the placement of the air supply holes 6 to better correspond to the placement of the gas sub-cavities 31 and the burner holes, increasing the number of air supply positions and improving the air supply effect; at the same time, providing a secondary air flow channel 5 between two adjacent gas sub-cavities 31 also improves the ease of placement of the secondary air flow channel 5.

[0058] To simplify the structure and improve combustion performance, the gas chamber 3 includes three gas sub-chambers 31 arranged side by side. The three gas sub-chambers 31 are a middle sub-chamber 31a and two side sub-chambers 31b located on opposite sides of the middle sub-chamber 31a. A secondary air flow channel 5 is provided between each side sub-chamber 31b and the middle sub-chamber 31a. In other embodiments, two, four, or other numbers of gas sub-chambers 31 can be provided, and the number of gas sub-chambers 31 can be set according to requirements.

[0059] In one embodiment, the top of the burner has a central fire plate 11 covering the central sub-cavity 31a and side fire plates 21 covering the two side sub-cavities 31b respectively. Multiple fire holes of each fire hole group 4 are distributed on the central fire plate 11 and the two side fire plates 21. A gas supply hole 6 is located between the side fire plates 21 and the central fire plate 11. By setting the central fire plate 11 and the side fire plates 21, the upper end of each gas sub-cavity 31 is blocked by the corresponding central fire plate 11 or side fire plate 21, preventing direct gas outflow and excessively fast flow, which could lead to some gas not having enough time to burn, thus avoiding gas waste and improving combustion performance. By setting the gas supply hole 6 between the side fire plates 21 and the central fire plate 11, it is easier to form the gas supply hole 6 by enclosing it, reducing the difficulty of setting the gas supply hole 6, and ensuring that the position of the gas supply hole 6 corresponds to the position of the secondary air flow channel 5 in the width direction of the burner.

[0060] In one embodiment, the burner has an ejector channel 12 that communicates with the intermediate sub-cavity 31a, and both side sub-cavities 31b are also connected to the intermediate sub-cavity 31a. This allows a portion of the mixed gas entering the intermediate sub-cavity 31a through the ejector channel 12 to be diverted into the two side sub-cavities 31b. This arrangement reduces the number of ejector channels 12, thereby simplifying the burner's structure, reducing its manufacturing difficulty, and improving the convenience of gas supply.

[0061] In other embodiments, the firebox has a first ejector channel and a second ejector channel. The first ejector channel is connected to the intermediate sub-cavity 31a, and both side sub-cavities 31b are connected to the second ejector channel. The first ejector channel and the second ejector channel eject mixed gases with different air-fuel ratios, so that the air-fuel ratio of the intermediate sub-cavity 31a is different from that of the two side sub-cavities 31b, thereby improving combustion stability.

[0062] To improve the ease of setting up the gas sub-cavity 31 and the secondary air flow channel 5, in one embodiment, the burner includes an inner shell 1 and two outer shells 2 disposed on opposite sides of the inner shell 1 along its width. The inner shell 1 has an ejector channel 12 and a central sub-cavity 31a, and the outer shells 2 have side sub-cavities 31b. Multiple burner holes of each burner hole group 4 are distributed at the top of the inner shell 1 and the two outer shells 2. Each outer shell 2 and the inner shell 1 are arranged to form a secondary air flow channel 5 and a gas supply hole 6. Specifically, the top of the outer shell 2 has a side burner plate 21, and the top of the inner shell 1 is provided with a central burner plate 11.

[0063] The secondary air flow channel 5 and the air supply hole 6 are formed by the inner shell 1 and the outer shell 2, which makes the setting of the secondary air flow channel 5 and the air supply hole 6 more convenient and helps to avoid the secondary air flow channel 5 from communicating with the gas sub-cavity 31, thus improving the structural rationality of the burner. At the same time, the outer shell 2 is set on opposite sides of the inner shell 1, and the outer shell 2 has a side sub-cavity 31b, which helps to reduce the assembly difficulty of the burner, improves the modular setting of the outer shell 2, and enhances the processing and assembly convenience of the burner.

[0064] To improve the connectivity between the side sub-cavities 31b and the intermediate sub-cavities 31a, the inner shell 1 has first through holes 13 on both opposite sides in the width direction, and the outer shell 2 has a second through hole 221 on the side facing the inner shell 1. The second through hole 221 is sealed and connected to the corresponding first through hole 13, so that the mixed gas in the intermediate sub-cavities 31a is diverted to the corresponding side sub-cavities 31b through the first through hole 13 and the second through hole 221. Multiple second through holes 221 are spaced apart along the length of the burner. The first through holes 13 on both sides of the inner shell 1 are correspondingly arranged with the corresponding second through holes 221 to improve the uniformity of the mixed gas in the side sub-cavities 31b along the length of the burner.

[0065] In one embodiment, the outer casing 2 has an air inlet 222 communicating with the side chamber 31b. The air inlet 222 is used to supply air into the side chamber 31b, so that the primary air coefficient of the mixed gas in the side chamber 31b is higher than that of the intermediate chamber 31a. This is beneficial to improving combustion stability and combustion completeness, and reducing harmful substances produced by combustion. Multiple air inlets are spaced apart along the length of the burner, thereby improving the uniformity of air supply to the side chamber 31b in the length direction, and further improving the uniformity of the mixed gas in the side chamber 31b in the length direction of the burner, thus improving combustion stability and combustion reliability.

[0066] In one embodiment, the secondary airflow channel 5 includes a pressure stabilizing chamber 52 and an air intake channel 51 arranged vertically. The pressure stabilizing chamber 52 extends along the length of the burner, and multiple air intake channels 51 are arranged at intervals along the length of the burner. The lower end of each air intake channel 51 is connected to the external environment and the upper end is connected to the pressure stabilizing chamber 52. The air supply hole 6 is connected to the pressure stabilizing chamber 52. By setting multiple intake channels 51 at intervals along the length of the burner, the intake flow rate and the uniformity of air supply are increased. At the same time, it is beneficial to avoid the communication positions between the intake channels 51 and the inner sub-cavity and the side sub-cavity 31b, and to facilitate the processing and shaping of the side sub-cavity 31b and the middle sub-cavity 31a, as well as the secondary air flow channel 5. By setting a pressure stabilizing cavity 52, and having multiple intake channels 51 connected to the pressure stabilizing cavity 52, the air entering from the intake channels 51 can enter the pressure stabilizing cavity 52 for buffering and uniform flow, thereby improving the uniformity of air flowing out of the multiple air supply holes 6, and further improving the uniformity of air supply to the multiple burner hole groups 4, thus improving combustion stability and reliability.

[0067] In other embodiments, the secondary airflow channel 5 may include a plurality of sub-channels spaced apart along the length of the burner, each sub-channel having its lower end connected to the external environment and its upper end connected to a corresponding air supply port 6. Along the length of the burner, a second through-hole 221 is located between two adjacent sub-channels.

[0068] In one embodiment, the second through hole 221 is located on the lower side of the pressure stabilizing cavity 52, and a second through hole 221 is provided between two adjacent air intake channels 51, so as to effectively balance the air intake uniformity of the secondary air flow channel 5 and the air replenishment uniformity of the side cavity 31b.

[0069] In one embodiment, the secondary airflow channel 5 further includes an air outlet channel 53 located above the pressure stabilizing chamber 52. Multiple air outlet channels 53 are spaced apart along the length of the burner. The lower end of each air outlet channel 53 communicates with the pressure stabilizing chamber 52, and the upper end extends through the top of the burner to form a supplementary air hole 6. By providing multiple air outlet channels 53 spaced apart along the length of the burner, the airflow exiting the supplementary air hole 6 can be guided and rectified, better controlling the direction and speed of the airflow exiting the supplementary air hole 6, and improving the supplementary air effect. Simultaneously, this arrangement allows the upper end of the inner shell 1 to partially fit and partially separate from the outer shell 2, which helps ensure the overall structural stability of the upper structure of the burner and improves the burner's instructions for use and user experience. In other embodiments, the supplementary air hole 6 can also be directly connected to the pressure stabilizing chamber 52.

[0070] In one embodiment, in a projection plane perpendicular to the width direction of the burner, the orthographic projections of the intake channel 51 and the exhaust channel 53 are at least partially offset, meaning the intake channel 51 and the exhaust channel 53 are offset in the height direction of the burner. This avoids the problem of uneven airflow from the intake channel 51 to the pressure stabilizing chamber 52, which would otherwise result in uneven airflow from the air supply port 6. It also facilitates uniform diffusion of the airflow from the intake channel 51 into the pressure stabilizing chamber 52, improving the airflow uniformity within the pressure stabilizing chamber 52. In other embodiments, in a projection plane perpendicular to the width direction of the burner, the orthographic projections of the intake channel 51 and the exhaust channel 53 are directly opposite each other in the height direction.

[0071] To increase the intake volume of the secondary airflow channel 5, in one embodiment, the intake channel 51 has a lower flared portion 513 extending upward from the intake port, and the width of the lower flared portion 513 gradually increases from top to bottom in the length direction of the burner; so as to increase the width of the lower end of the intake channel 51 while keeping the width of the middle part of the intake channel 51 unchanged, so as to facilitate the guidance of external air to enter the intake channel 51, thereby reducing the intake resistance and increasing the intake volume.

[0072] To further improve the uniformity of air supply, in one embodiment, the air intake channel 51 has an upper flared portion 511 extending downward from the air outlet port, the width of which gradually increases from bottom to top along the length of the burner. By providing the upper flared portion 511, the air flowing out of the air intake channel 51 can be more evenly diffused into the pressure stabilizing chamber 52, thereby improving the air uniformity within the pressure stabilizing chamber 52. Furthermore, the air intake channel 51 also has an intermediate air intake portion 512 located between the upper flared portion 511 and the lower flared portion 513, the width of which is approximately the same.

[0073] To improve the ease of forming the secondary airflow channel 5, in one embodiment, the outer shell 2 has a plurality of first protrusions 22 and a plurality of first recesses 23 on the side facing the inner shell 1. The plurality of first protrusions 22 and the plurality of first recesses 23 are staggered along the length direction of the burner. The first protrusions 22 abut against the inner shell 1, and the first protrusions 22 are provided with second through holes 221. The first recesses 23 are spaced apart from the inner shell 1, so that the first recesses 23 form an air intake channel 51 relative to the recessed space of the inner shell 1. The outer shell 2 also has a plurality of second protrusions 24 and second recesses 25 on the side facing the inner shell 1. The plurality of second protrusions 24 and the plurality of second recesses 25 are staggered along the length direction of the burner. The second protrusions 24 abut against the inner shell 1, and the second recesses 25 are spaced apart from the inner shell 1, so that the second recesses 25 form an air outlet channel 53 relative to the recessed space of the inner shell 1. The second protrusion 24 is spaced above the first protrusion 22, and the pressure stabilizing cavity 52 is located between the second protrusion 24 and the first protrusion 22.

[0074] In one embodiment, the lower sidewall of the second protrusion 24 extends obliquely from top to bottom away from the inner shell 1, thereby forming an air intake space that is flared from top to bottom between the lower sidewall of the second protrusion 24 and the inner shell 1. An air intake hole 222 is provided on the lower sidewall of the second protrusion 24, thereby facilitating the guidance of the external space into the side cavity 31b through the air intake hole 222.

[0075] In one embodiment, in each group of flame holes 4, the flame holes on the intermediate flame plate 11 constitute an intermediate flame hole subgroup 41, and the flame holes on each side flame plate 21 constitute a side flame hole subgroup 42. The number of flame holes in the side flame hole subgroup 42 is greater than the number of flame holes in the intermediate flame hole subgroup 41. This results in the flame combustion at the side flame hole subgroup 42 being the main flame combustion, while the flame combustion at the intermediate flame hole subgroup 41 is a stable flame combustion, effectively improving combustion stability. The air supply hole 6 is relatively close to the flame holes on the side flame plate 21, which facilitates the processing and shaping of the air supply hole 6 and avoids the air supply hole 6 occupying the width space of the intermediate flame plate 11.

[0076] The intermediate flame hole group 41 includes a plurality of flame holes spaced apart along the length of the flame bar. The flame holes are preferably elongated holes extending along the width of the flame bar to increase the ventilation area of ​​a single flame hole and reduce the width of a single flame hole, which is beneficial to increase the heat dissipation area of ​​the flame while controlling the speed at which the mixed gas flows out of the flame hole.

[0077] In one embodiment, each side flame hole subgroup 42 includes a first flame hole unit 421 and a second flame hole unit 422 arranged side-by-side and facing each other along the width direction of the flame bar. The first flame hole unit 421 is positioned close to the middle flame plate 11 relative to the second flame hole unit 422. Both the first flame hole unit 421 and the second flame hole unit 422 include a plurality of flame holes spaced apart along the length direction of the flame bar. Along the length direction of the flame bar, the air supply hole 6 is directly opposite the first flame hole unit 421. By setting the first flame hole unit 421 and the second flame hole unit 422, the number of flame holes on the side flame plate 21 can be increased, thereby increasing the flame heat dissipation area. By directly opposite the first flame hole unit 421 to the air supply hole 6, interference between the air supply hole 6 and the flame holes can be avoided, while increasing the available area for opening the flame holes.

[0078] Along the length of the fire bar, the fire hole distribution area of ​​the second fire hole unit 422 is larger than the fire hole indexing area of ​​the first fire hole unit 421. The outer contour of the air supply hole 6 on the side fire plate 21 is a first trapezoid. The two parallel sides of the first trapezoid extend along the length of the fire bar, and the shorter side of the two parallel sides is far away from the middle fire plate 11. By setting the outer contour of the air supply hole 6 on the side burner plate 21 in a first trapezoidal shape, with the long parallel side of the first trapezoid close to the middle burner plate 11, the width of the air supply hole 6 in the length direction of the burner plate gradually increases towards the middle burner plate 11. This results in a shorter length of the parallel side of the air supply hole 6 near the second burner unit 422, thus avoiding interference between the airflow from the air supply hole 6 and the burner hole of the second burner unit 422 due to excessively small spacing, thereby better ensuring combustion stability. At the same time, the length of the first trapezoid near the middle burner plate 11 is relatively large, which can better utilize the spacing between two adjacent first burner units 421, increasing the ventilation area of ​​the air supply hole 6, thereby better ensuring the air supply volume. Setting the air supply hole 6 in a first trapezoidal shape facilitates the forming of the air supply hole 6 by stamping.

[0079] Along the length of the firebox, the minimum distance between the air supply hole 6 and the adjacent fire hole is H, where 1mm ≤ H ≤ 10mm. The distance H can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, etc., to keep the distance H between the air supply hole 6 and the adjacent fire hole group 4 within a suitable range. This prevents the secondary air from the air supply hole 6 from directly impacting the flame root, while ensuring sufficient secondary air is supplied to the two adjacent flames to guarantee the air supply effect. If the distance H is too small, the secondary air from the air supply hole 6 may directly impact the flame root, causing flame instability; if the distance H is too large, it will reduce the air supply effect of the air supply hole 6 to the two adjacent flames.

[0080] In the width direction of the burner, the width of the air supply hole 6 is L, where 1mm ≤ L ≤ 5mm. L can be 1mm, 2mm, 3mm, 4mm, or 5mm, etc., to ensure the air supply volume of the air supply hole 6 while reducing the processing difficulty. If L is too small, the opening area of ​​the air supply hole 6 will be reduced, thereby reducing the air supply volume and leading to incomplete combustion and reduced combustion performance. If L is too large, the stamping and stretching dimensions of the air supply hole 6 will be too large, increasing the processing difficulty.

[0081] Furthermore, in the width direction of the fire bar, the width of the air supply hole 6 is smaller than the width of the first fire hole unit 421 in the distribution area, which helps to increase the distance between the air supply hole 6 and the fire holes in the second fire hole unit 422, and reduce the impact of the airflow from the air supply hole 6 on the flame combustion at the second fire hole unit 422.

[0082] In one embodiment, the first flame hole unit 421 includes N flame holes spaced apart along the length of the flame bar, and the second flame hole unit 422 includes N+2 flame holes spaced apart along the length of the flame bar. The N flame holes of the first flame hole unit 421 and the N flame holes in the middle of the second flame hole unit 422 are arranged directly opposite each other. In the width direction of the flame bar, the two outermost flame holes of the second flame hole unit 422 are directly opposite the long side ends of the air supply hole 6. This allows the shape of the air supply hole 6 to better match the distribution area of ​​the side flame hole subgroup 42, and ensures that there is a certain distance between the air supply hole 6 and the adjacent flame holes. Furthermore, the distance between two adjacent flame holes of two adjacent second flame hole units 422 in the length direction of the flame bar is greater than the length of the short side of the air supply hole 6, thereby ensuring the installation area of ​​the air supply hole 6 while avoiding the air supply hole 6 being too close to the flame holes in the second flame hole unit 422.

[0083] In one embodiment, two side fire plates 21 are located on both sides of the middle fire plate 11 and are inclined upward relative to the middle fire plate 11, so that the top of the fire row has a concave structure. This arrangement can increase the width of the side fire plates 21 while keeping the overall width of the fire row unchanged, thereby increasing the opening area of ​​the fire holes on the side fire plates 21, which is conducive to the opening of the first fire hole unit 421 and the second fire hole unit 422. At the same time, this arrangement can make the flame corresponding to the middle sub-cavity 31a sink slightly, which has a better flame stabilization effect on the flame roots corresponding to the two side sub-cavities 31b, which is conducive to improving the flame combustion stability.

[0084] Example 2

[0085] This embodiment also proposes a burner, a burner including the burner, and a gas-fired water heater. The burner provided in this embodiment has a structure that is largely the same as that in Embodiment 1, with only some differences in the configuration. This embodiment will not repeat the contents that are the same as those in the above embodiments.

[0086] like Figure 6 and Figure 7As shown, the gas chamber 3 includes three gas sub-chambers 31, namely a central gas chamber 3 and two side gas chambers 3 located on opposite sides of the central gas chamber 3. The top of the burner has a central flame plate 11 covering the central gas chamber 3 and two side flame plates 21 covering the upper ends of the two side gas chambers 3 respectively. Multiple flame holes of each flame hole group 4 are distributed on the central flame plate 11 and the two side flame plates 21. The gas supply hole 6 is disposed between the side flame plates 21 and the central flame plate 11. Along the height direction of the burner, the two side flame plates 21 are higher than the central flame plate 11 and are arranged parallel to the central flame plate 11, so that the top of the burner has a concave structure. In this embodiment, by setting the side flame plates 21 to be higher than the central flame plate 11, the upper end of the burner is concave. This setting allows the flame corresponding to the central sub-chamber 31a to sink slightly, providing a better flame stabilization effect for the flame roots corresponding to the two side sub-chambers 31b.

[0087] In this embodiment, the outer contour of the air supply hole 6 on the side fire plate 21 is a second trapezoid. The two parallel sides of the second trapezoid are arranged along the length direction of the fire bar, and the longer side of the two parallel sides is close to the middle fire plate 11. The width of the air supply hole 6 in the width direction of the fire bar is less than one-third of the width of the side fire plate 21, so as to reduce the interference of the airflow flowing out of the air supply hole 6 with the airflow flowing out of the fire hole on the side fire plate 21.

[0088] Furthermore, the firebox includes an inner shell 1 and two outer shells 2 disposed on opposite sides of the inner shell 1, with the upper end of the outer shell 2 being higher than the upper end of the inner shell 1.

[0089] Other structures of the firebox can be set up with reference to Embodiment 1.

[0090] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fire grill, characterized in that, The burner is provided with a separate gas chamber (3) and a secondary air flow channel (5). The top of the burner is provided with a plurality of burner hole groups (4) communicating with the gas chamber (3) and a plurality of air supply holes (6) communicating with the secondary air flow channel (5). Each burner hole group (4) includes a plurality of burner holes. Along the length of the burner, the plurality of burner hole groups (4) are spaced apart, and the air supply hole (6) is provided between two adjacent burner hole groups (4).

2. The fire grill according to claim 1, characterized in that, The gas chamber (3) includes a plurality of gas sub-chambers (31) arranged separately along the width direction of the burner; in each of the plurality of burner holes of each burner hole group (4), each gas sub-chamber (31) is connected to at least one burner hole.

3. The fire grill according to claim 2, characterized in that, The secondary air flow channel (5) is provided between two adjacent gas sub-cavities (31), and the top of the burner is provided with a plurality of air replenishment holes (6) corresponding to each of the secondary air flow channels (5).

4. The fire grill according to claim 3, characterized in that, The secondary airflow channel (5) includes a pressure stabilizing chamber (52) and an air intake channel (51) arranged vertically. The pressure stabilizing chamber (52) extends along the length of the burner. Multiple air intake channels (51) are arranged at intervals along the length of the burner. The lower end of each air intake channel (51) is connected to the external environment and the upper end is connected to the pressure stabilizing chamber (52). The air supply hole (6) is connected to the pressure stabilizing chamber (52).

5. The fire grill according to claim 4, characterized in that, The secondary air flow channel (5) also includes an air outlet channel (53) located above the pressure stabilizing chamber (52). Multiple air outlet channels (53) are spaced apart along the length of the burner. The lower end of each air outlet channel (53) is connected to the pressure stabilizing chamber (52) and the upper end penetrates the top of the burner to form the air replenishment hole (6).

6. The fire grill according to claim 5, characterized in that, In the height direction of the fire bar, the air intake channel (51) and the air outlet channel (53) are at least partially misaligned.

7. The fire grill according to claim 4, characterized in that, The air intake channel (51) has a lower flared portion (513) extending upward from the air intake port, and the width of the lower flared portion (513) gradually increases from top to bottom in the length direction of the burner. And / or, the air intake passage (51) has an upper flare (511) extending downward from the air outlet, the width of the upper flare (511) gradually increasing from bottom to top in the length direction of the burner.

8. The fire grill according to claim 3, characterized in that, The gas chamber (3) includes three gas sub-chambers (31), which are a middle sub-chamber (31a) and two side sub-chambers (31b) located on opposite sides of the middle sub-chamber (31a). The top of the burner has a middle burner plate (11) covering the middle sub-chamber (31a) and two side burner plates (21) covering the upper ends of the two side sub-chambers (31b). Multiple burner holes of each burner hole group (4) are distributed on the middle burner plate (11) and the two side burner plates (21). The gas supply hole (6) is located between the side burner plate (21) and the middle burner plate (11).

9. The fire grill according to claim 8, characterized in that, In each of the flame hole groups (4), the flame holes on the intermediate flame plate (11) constitute an intermediate flame hole subgroup (41), and the flame holes on each of the side flame plates (21) constitute a side flame hole subgroup (42). The number of flame holes in the side flame hole subgroup (42) is greater than the number of flame holes in the intermediate flame hole subgroup (41). The air supply hole (6) is relatively close to the flame holes on the side flame plate (21).

10. The fire grill according to claim 9, characterized in that, Each of the side flame hole subgroups (42) includes a first flame hole unit (421) and a second flame hole unit (422) arranged side by side and facing each other along the width direction of the flame bar. The first flame hole unit (421) is arranged close to the middle flame plate (11) relative to the second flame hole unit (422). Both the first flame hole unit (421) and the second flame hole unit (422) include a plurality of flame holes spaced apart along the length direction of the flame bar. Along the length direction of the flame bar, the air supply hole (6) is directly opposite to the first flame hole unit (421).

11. The fire briquette according to claim 10, characterized in that, Along the length of the fire bar, the fire hole distribution area of ​​the second fire hole unit (422) is larger than that of the first fire hole unit (421). The outer contour of the air supply hole (6) on the side fire plate (21) is a first trapezoid. The two parallel sides of the first trapezoid extend along the length of the fire bar, and the shorter side of the two parallel sides is far away from the middle fire plate (11).

12. The fire briquette according to claim 8, characterized in that, The two side fire plates (21) are located on both sides of the middle fire plate (11) and are inclined upward relative to the middle fire plate (11) so that the top of the fire plate has a recessed structure.

13. The fire grill according to claim 8, characterized in that, Along the height direction of the fire bar, the two side fire plates (21) are higher than the middle fire plate (11) and are arranged parallel to the middle fire plate (11) so that the top of the fire bar has a recessed structure.

14. The fire rack according to any one of claims 3-13, characterized in that, The gas chamber (3) includes three gas sub-chambers (31), which are a middle sub-chamber (31a) and two side sub-chambers (31b). The burner includes an inner shell (1) and two outer shells (2) disposed on opposite sides of the inner shell (1) along the width direction. The inner shell (1) has a communicating ejector channel (12) and the middle sub-chamber (31a). Each outer shell (2) has a side sub-chamber (31b) which communicates with the ejector channel (12). Multiple burner holes of each burner hole group (4) are distributed at the top of the inner shell (1) and the two outer shells (2). The opposite sides of the inner shell (1) and the two outer shells (2) are surrounded to form the secondary air flow channel (5) and the air supply hole (6).

15. The fire grill according to claim 14, characterized in that, The ejector channel (12) is provided in one way, and both of the side chambers (31b) are connected to the intermediate chamber (31a) so that part of the mixed gas in the intermediate chamber (31a) is diverted to the two side chambers (31b).

16. The fire grill according to claim 15, characterized in that, The outer casing (2) has an air inlet (222) that communicates with the side cavity (31b).

17. A burner, characterized in that, Including the fire rack as described in any one of claims 1-16.

18. A gas-fired hot water device, characterized in that, Includes the burner as described in claim 17.

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