Fire grate and burner

Abstract

This utility model belongs to the field of combustion technology, specifically disclosing a burner and a flame grid. The burner has a central combustion chamber and two main combustion chambers located on opposite sides of the central combustion chamber along its width. The primary air coefficient of the gas mixture in the main combustion chambers is higher than that in the central combustion chambers. The primary air coefficients of the gas mixture in both the main combustion chambers and the central combustion chambers are less than 1. A flame stabilizing hole is provided at the upper end of the central combustion chamber, communicating directly with it. Each main combustion chamber has a main flame hole at its upper end, communicating directly with the corresponding main combustion chamber. The total ventilation area of ​​the main flame holes corresponding to each main combustion chamber is greater than the total ventilation area of ​​the flame stabilizing holes. This utility model enables the combustion of the main flames on both sides of the central flame stabilizing hole, improving combustion stability and completeness.

Description

Technical Field

[0001] This utility model relates to the field of combustion technology, and in particular to a burner and a flame grid. Background Technology

[0002] The burner is the core component of gas water heaters, gas wall-hung boilers and other gas water heating equipment. Its combustion performance, such as complete combustion and stability, directly affects the performance of the gas water heating equipment.

[0003] Existing burners used in gas-fired water heaters typically include multiple burners arranged side-by-side. One existing burner includes a housing with a connecting ejector channel and a combustion chamber. The combustion chamber has an open upper end, and a fire plate covering the open end of the combustion chamber is located on top of the housing. The fire plate has a row of central flame holes and two rows of flame-stabilizing holes located on either side of the central flame holes. When the burner is in use, the flame at the central flame holes is the dominant flame, while the flames at the flame-stabilizing holes are flames that stabilize the flame.

[0004] The existing technology provides a burner where the central burner hole and the flame stabilizer hole are connected to the same combustion chamber, resulting in the same primary air coefficient for the mixed gas flowing out of the central burner hole and the flame stabilizer hole. Since the primary air coefficient is an important parameter in combustion engineering, it represents the ratio of the actual amount of primary air supplied to the fuel to the amount of air required for complete combustion. The closer the primary air coefficient is to 1, the higher the combustion efficiency, but the worse the combustion stability. Therefore, the existing technology provides a burner that cannot effectively balance combustion thermal efficiency and combustion stability. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide a fire duct that can balance combustion efficiency and combustion stability.

[0006] The second technical problem solved by this utility model is to provide a burner that can balance combustion efficiency and combustion stability.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A combustor has an intermediate combustion chamber and two main combustion chambers disposed on opposite sides of the intermediate combustion chamber along its width. When the combustor is in operation, the primary air coefficient of the mixed gas in the main combustion chamber is higher than that of the mixed gas in the intermediate combustion chamber, and the primary air coefficients of the mixed air in both the main combustion chamber and the intermediate combustion chamber are less than 1.

[0009] The burner is provided with a flame stabilizing hole at the upper end of the intermediate combustion chamber, which is directly connected to the intermediate combustion chamber. The burner is provided with a main fire hole at the upper end of each main combustion chamber, which is directly connected to the corresponding main combustion chamber. The total ventilation area of ​​the main fire hole corresponding to each main combustion chamber is greater than the total ventilation area of ​​the flame stabilizing hole.

[0010] Compared with the prior art, the fire purifier described in this utility model has the following beneficial effects: By setting two main combustion chambers and an intermediate combustion chamber located between the two main combustion chambers, the total ventilation area of ​​the flame stabilizing holes corresponding to the intermediate combustion chamber is smaller than the total ventilation area of ​​the main flame holes in each main combustion chamber. This ensures that when the fire purifier is in use, the flame formed at the main flame holes is the main flame, and the flame formed at the flame stabilizing holes is the flame stabilizing flame. Since the primary air coefficient of the mixed gas in the main combustion chamber is higher than that in the intermediate combustion chamber, and the primary air coefficients of both the intermediate and side combustion chambers are less than 1, the main flame is burned by a mixed gas with a high primary air coefficient, resulting in better combustion completeness and higher thermal efficiency. Meanwhile, since the primary air coefficient of the mixed gas in the intermediate combustion chamber is lower than that in the main combustion chamber, the flame at the flame stabilizing holes is burned by a mixed gas with a relatively low primary air coefficient, resulting in high combustion stability. Furthermore, the flame stabilizing flame can stabilize the root of the main flame, thereby achieving a balance between the combustion thermal efficiency and combustion stability of the fire purifier and improving the overall user experience.

[0011] In one embodiment, the total ventilation area of ​​the main flame hole corresponding to each main combustion chamber is S1, and the total ventilation area of ​​the flame stabilizing hole is S2, where 2≤S1:S2≤4.5.

[0012] In one embodiment, when the burner is in operation, the primary air coefficient of the intermediate combustion chamber is 0.4 to 0.6, and the primary air coefficient of the mixed gas in the main combustion chamber is 0.7 to 0.9.

[0013] In one embodiment, the top of the burner has a side flame plate covering the upper end of the main combustion chamber, the side flame plate is arranged in a one-to-one correspondence with the main combustion chamber, and the side flame plate has a plurality of main flame holes along the length direction of the burner.

[0014] The top of the fire bar has an intermediate fire plate covering the upper end of the intermediate combustion chamber, and the intermediate fire plate is provided with a plurality of flame stabilizing holes at intervals along the length of the fire bar.

[0015] The upper width of the intermediate combustion chamber is less than or equal to the upper width of the main combustion chamber.

[0016] In one embodiment, the intermediate fire plate is provided with a plurality of intermediate fire hole groups along its length, each intermediate fire hole group including a plurality of flame stabilizing fire holes spaced apart along its length. The side fire plate is provided with a plurality of side fire hole groups along its length, each side fire hole group including a plurality of main fire holes spaced apart along its length. In the width direction of the fire bar, one intermediate fire hole group is aligned with one side fire hole group of each of the two side fire plates. The total ventilation area of ​​each side fire hole group is greater than the total ventilation area of ​​the corresponding intermediate fire hole group.

[0017] In one embodiment, the number of flame stabilizing holes in each of the side flame hole groups is greater than the number of flame stabilizing holes in the corresponding middle flame hole group;

[0018] And / or, both the flame stabilizing hole and the main fire hole are elongated holes extending along the width direction of the fire row, and the width of the flame stabilizing hole is smaller than the width of the main fire hole.

[0019] In one embodiment, the burner has an ejector channel, the intermediate combustion chamber is connected to the ejector channel, and the intermediate combustion chamber is connected to both main combustion chambers so that a portion of the mixed gas in the intermediate combustion chamber is diverted to the two main combustion chambers. The walls of the main combustion chambers are provided with air inlets that connect to the external environment.

[0020] In one embodiment, the fire bar includes an inner shell and two outer shells, the inner shell being sandwiched between the two outer shells, the inner shell having the ejector channel, the intermediate combustion chamber and the flame stabilizing hole, the outer shells surrounding to form the main combustion chamber or the outer shells and the inner shells surrounding to form the main combustion chamber, and the top of the outer shells being provided with the main flame hole.

[0021] In one embodiment, the two outer shells are separately arranged, and each outer shell surrounds the circumferentially closed main combustion chamber. The inner shell has multiple first through holes on its opposite sides. The side of the outer shell facing the inner shell is fitted with the inner shell and has multiple second through holes. The second through holes correspond one-to-one with the first through holes on the same side and are connected.

[0022] In one embodiment, the burner includes an outer plate portion forming the outer cavity wall of the main combustion chamber, the burner includes a side flame plate covering the upper end of the main combustion chamber, the side flame plate has a plurality of main flame holes, and the upper end of the outer plate portion is higher than the upper end of the side flame plate.

[0023] And / or, the outer casing includes a chamber bottom plate forming the bottom of the main combustion chamber, the chamber bottom plate being inclined from top to bottom in a direction away from the inner casing, and the chamber bottom plate having an air intake hole.

[0024] In one embodiment, the height difference between the upper end of the outer side plate and the side fire plate is h, where 1mm ≤ h ≤ 5mm.

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

[0026] A burner comprising a fire bar as described above.

[0027] Compared with the prior art, the burner of this utility model has the following advantages: by adopting the above-mentioned burner, the combustion stability, completeness and safety can be improved, and the user experience of the burner can be enhanced. Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of the fire briquette provided in an embodiment of this utility model;

[0029] Figure 2 This is a cross-sectional structural diagram of the fire bar provided in an embodiment of the present utility model;

[0030] Figure 3 for Figure 2 A magnified view of a section at point I;

[0031] Figure 4 A partial structural cross-sectional view of the fire briquette provided in an embodiment of this utility model;

[0032] Figure 5 This is a schematic diagram of the disassembled structure of the fire briquette provided in an embodiment of the present utility model.

[0033] Label Explanation:

[0034] 1. Inner shell; 11. Intermediate fire plate; 111. Flame stabilizing hole; 12. Inner half shell; 121. First through hole; 13. Intermediate combustion chamber; 14. Injector channel;

[0035] 2. Outer shell; 21. Outer side plate; 22. Side burner plate; 221. Main burner hole; 23. Inner side plate; 231. Second through hole; 24. Cavity bottom plate; 241. Air intake hole; 25. Edge banding; 26. Folding plate; 27. Insert plate; 28. Side end plate; 29. ​​Fixed edge; 210. Main combustion chamber. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 application 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 application.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] This embodiment provides a burner that can be applied to a burner to reduce the combustion heat load and improve the stability and safety of the burner and burner.

[0041] like Figure 1 and Figure 2 As shown, in this embodiment, the burner has an intermediate combustion chamber 13 and main combustion chambers 210 disposed on opposite sides of the intermediate combustion chamber 13 along its width. The primary air coefficient of the mixed gas in the main combustion chamber 210 is higher than that in the intermediate combustion chamber 13. The primary air coefficients of the mixed air in both the main combustion chamber 210 and the intermediate combustion chamber 13 are less than 1. The burner has a flame stabilizing hole 111 at the upper end of the intermediate combustion chamber 13, which is directly connected to the intermediate combustion chamber 13. The burner has a main fire hole 221 at the upper end of each main combustion chamber 210, which is directly connected to the corresponding main combustion chamber 210. The total ventilation area of ​​the main fire hole 221 corresponding to each main combustion chamber 210 is greater than the total ventilation area of ​​the flame stabilizing hole 111.

[0042] By setting two main combustion chambers 210 and an intermediate combustion chamber 13 located between the two main combustion chambers 210, the total ventilation area of ​​the flame stabilizing holes 111 corresponding to the intermediate combustion chamber 13 is smaller than the total ventilation area of ​​the main flame holes 221 of each main combustion chamber 210. This ensures that when the burner is in use, the flame formed at the main flame holes 221 is the main flame, and the flame formed at the flame stabilizing holes 111 is the stabilizing flame. Since the primary air coefficient of the gas mixture in the main combustion chamber 210 is higher than that in the intermediate combustion chamber 13, and the primary air coefficient of the gas mixture in the intermediate combustion chamber 13 and the side combustion chambers... With air coefficients all less than 1, the main flame is burned by a mixture of gases with a high air coefficient, resulting in good combustion completeness and high thermal efficiency. Since the primary air coefficient of the mixture in the intermediate combustion chamber 13 is lower than that of the mixture in the main combustion chamber 210, the flame at the flame stabilizing port 111 is burned by a mixture of gases with a relatively low primary air coefficient, resulting in high combustion stability. Furthermore, the flame stabilizing flame can stabilize the root of the main flame, thereby achieving a balance between the combustion thermal efficiency and combustion stability of the firebox and improving the overall user experience of the firebox.

[0043] In one embodiment, the burner has an ejector channel 14, an intermediate combustion chamber 13 connected to the ejector channel 14, and a main combustion chamber 210 and an intermediate combustion chamber 13 connected through a gas vent hole, so that part of the mixed gas in the intermediate combustion chamber 13 is diverted to the two main combustion chambers 210. An air inlet hole 241 is provided on the wall of the main combustion chamber 210. When the burner is in use, a mixture of gas and air with a certain air-fuel ratio enters the intermediate combustion chamber 13 through the ejector channel 14. Part of the mixed gas in the intermediate combustion chamber 13 flows upward to the flame stabilizing hole 111, and part enters the two main combustion chambers 210 through the gas vent hole. Because an air intake hole 241 is provided at the main combustion chamber 210, external air enters the main combustion chamber 210 through the air intake hole 241 and mixes with the gas mixture in the main combustion chamber 210. This results in the air-fuel ratio of the gas mixture in the main combustion chamber 210 being higher than that in the intermediate combustion chamber 13. In other words, the primary air coefficient in the main combustion chamber 210 is higher than that in the intermediate combustion chamber 13. Consequently, during combustion in the burner, the combustion completeness at the main flame hole 221 is enhanced, and the flame stabilizing hole 111 can play a better role in stabilizing the flame.

[0044] In other embodiments, the burner may have a first ejector channel and a second ejector channel, which respectively eject mixed gases with different air-fuel ratios. The first ejector channel is connected to the intermediate combustion chamber 13, and the second ejector channel is connected to the main combustion chamber 210.

[0045] In one embodiment, when the burner is in operation, the primary air coefficient of the gas mixture in the intermediate combustion chamber 13 is 0.4–0.6, and the primary air coefficient of the gas mixture in the main combustion chamber 210 is 0.7–0.9. Setting the primary air coefficient of the gas mixture in the main combustion chamber 210 to 0.7–0.9 makes the primary air coefficient of the gas mixture in the main combustion chamber 210 close to 1, resulting in strong combustion completeness. Meanwhile, the primary air coefficient of the gas mixture in the intermediate combustion chamber 13 can better achieve stable flame combustion, avoiding the problems of low combustion efficiency and fuel waste caused by a low primary air coefficient. It also better stabilizes the flame at the flame port 111. In other words, this configuration better balances combustion stability and combustion thermal efficiency.

[0046] Specifically, the primary air coefficient of the gas mixture in the intermediate combustion chamber 13 can be, but is not limited to, 0.4, 0.45, 0.5, 0.55, and 0.6, and the primary air coefficient of the gas mixture in the main combustion chamber 210 can be, but is not limited to, 0.7, 0.75, 0.8, 0.85, and 0.9. Optionally, the primary air coefficient of the gas mixture in the intermediate combustion chamber 13 is 0.5, and the primary air coefficient of the gas mixture in the two main combustion chambers 210 is 0.8.

[0047] In one embodiment, the total ventilation area of ​​the main burner hole 221 corresponding to each main combustion chamber 210 is S1, and the total ventilation area of ​​the flame stabilizing burner hole 111 is S2, where 2≤S1:S2≤4.5. This results in the total ventilation area of ​​the flame stabilizing burner hole 111 accounting for 10% to 20% of the total ventilation area of ​​the burner holes in the entire burner, and the heat load of flame stabilizing combustion accounting for 10% to 25% of the heat load of the entire burner combustion.

[0048] To better control the total ventilation area of ​​the flame stabilizer holes 111 and the main flame holes 221, in one embodiment, the top of the fire rack has an intermediate fire plate 11 covering the upper end of the intermediate combustion chamber 13, and the intermediate fire plate 11 is provided with a plurality of flame stabilizer holes 111 spaced apart along the length of the fire rack; the top of the fire rack has a side fire plate 22 covering the upper end of the main combustion chamber 210, and the side fire plate 22 is provided in a one-to-one correspondence with the main combustion chamber 210, and the side fire plate 22 is provided with a plurality of main flame holes 221 spaced apart along the length of the fire rack. This allows for control of the total ventilation area of ​​the main flame holes 221 and the total ventilation area of ​​the flame stabilizer holes 111 by adjusting the number of main flame holes 221 and the area of ​​each hole, thus improving the design flexibility of the fire rack; simultaneously, this arrangement allows the main flame and the flame stabilizer flame to be dispersed, facilitating heat dissipation during flame combustion, reducing the temperature at the flame root, thereby reducing the heat load and improving the performance of the fire rack.

[0049] In other embodiments, the intermediate combustion chamber 13 may be open at the top, that is, the open top of the intermediate combustion chamber 13 forms a flame stabilizing hole 111.

[0050] In one embodiment, the upper width of the intermediate combustion chamber 13 is less than or equal to the upper width of the main combustion chamber 210. This allows for an increase in the width of the side flame plate 22 while maintaining the overall width of the flame bar. This facilitates the arrangement of a larger number of main flame holes 221 or the setting of larger main flame holes 221. At the same time, this arrangement avoids the problem of excessively fast flow of the mixed gas out of the main combustion chamber 210 due to the small upper width of the main combustion chamber 210 and the large amount of mixed gas, further improving the stability of combustion.

[0051] In one embodiment, the upper width of the intermediate combustion chamber 13 is 2mm to 4.5mm, which may be, but is not limited to, 2mm, 2.5mm, 3mm, 3.5mm, 4mm or 4.5mm; the upper width of the main combustion chamber 210 is 4mm to 6mm, which may be, but is not limited to, 4mm, 4.5mm, 5mm, 5.5mm or 6mm.

[0052] In one embodiment, the side flame plate 22 is horizontally arranged to simplify the structure of the flame bar. In other embodiments, the side flame plate 22 can extend upward at an angle away from the middle flame plate 11, thereby increasing the area of ​​the side flame plate 22 while keeping the upper width of the main combustion chamber 210 unchanged, thereby increasing the area that can be opened in the main flame hole 221.

[0053] The intermediate flame plate 11 has multiple intermediate flame hole groups spaced apart along its length, each intermediate flame hole group including multiple flame stabilizing holes 111 spaced apart along its length. The side flame plates 22 have multiple side flame hole groups spaced apart along their length, each side flame hole group including multiple main flame holes 221 spaced apart along its length. In the width direction of the fire bar, one intermediate flame hole group is aligned with one side flame hole group on each of the two side flame plates 22, and the total ventilation area of ​​each intermediate flame hole group is smaller than the ventilation area of ​​each side flame hole group. By setting multiple intermediate flame hole groups and multiple side flame hole groups, the main flame combustion and the flame stabilizing flame can be grouped for combustion, thereby further improving heat dissipation during flame combustion and reducing the heat load generated by combustion.

[0054] In one embodiment, the number of flame stabilizing holes 111 in the intermediate flame hole group is less than the number of main flame holes 221 in the side flame hole group. This allows for control over the total ventilation area of ​​the flame stabilizing holes 111 and the total ventilation area of ​​the main flame holes 221 by adjusting the number of holes, thus preventing the large area of ​​a single main flame hole 221 from affecting combustion performance. Optionally, the number of flame stabilizing holes 111 in each intermediate flame hole group is 2 to 5, but is not limited to 2, 3, 4, or 5; the number of main flame holes 221 in each side flame hole group is 3 to 6, but is not limited to 3, 4, 5, 6, 7, or 8.

[0055] To improve the ease of setting the flame stabilizer hole 111 and the main flame hole 221, in one embodiment, both the flame stabilizer hole 111 and the main flame hole 221 are elongated holes extending along the width direction of the flame bar, thereby increasing the flame heat dissipation area and improving combustion completeness. The width of the flame stabilizer hole 111 is smaller than the width of the main flame hole 221, so that the ventilation area of ​​a single flame stabilizer hole 111 is smaller than the ventilation area of ​​a single main flame hole 221.

[0056] Optionally, the width of the stabilizing flame hole 111 is 0.25mm to 0.6mm, which may, but is not limited to, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, or 6mm. The width of the main flame hole 221 is 0.5mm to 1mm, which may, but is not limited to, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm.

[0057] In one embodiment, the burner includes an outer plate portion 21 forming the outer cavity wall of the main combustion chamber 210, and a side flame plate 22 covering the upper end of the main combustion chamber 210. The side flame plate 22 has multiple main flame holes 221, and the upper end of the outer plate portion 21 is higher than the upper end of the side flame plate 22. This arrangement can prevent the flame at the main flame holes 221 from spreading outward, which is beneficial to the concentration of the flame at the main flame holes 221 and improves combustion stability. At the same time, this arrangement can protect the root of the main flame at the main flame holes 221, preventing the root of the main flame from being impacted by the secondary air from the outside, thus improving combustion stability.

[0058] The height difference h between the upper end of the outer side plate 21 and the side fire plate 22 is 1mm to 5mm, so as to protect the main flame while avoiding excessive height that would affect the secondary air supply. Specifically, h can be, but is not limited to, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0059] In one embodiment, the burner includes a chamber bottom plate 24 forming the bottom of the main combustion chamber 210. The chamber bottom plate 24 is inclined from top to bottom along the direction away from the intermediate combustion chamber 13, and the chamber bottom plate 24 is provided with an air inlet 241. Since the gap between the lower ends of two adjacent burners is larger than the gap between the upper ends of two adjacent burners when multiple burners are arranged in a burner, by setting the air intake port 241 at the bottom plate 24, air can enter the main combustion chamber 210 from bottom to top, which can better ensure the air intake volume and avoid the problem of insufficient air supply caused by the small gap between the upper parts of two adjacent burners. At the same time, this creates a downwardly flared air supply space between the bottom plate 24 and the outer side of the cavity wall of the intermediate combustion chamber 13, which helps to guide the lower air into the air supply space and then into the main combustion chamber 210 through the air intake port 241, further ensuring smooth air intake and ensuring the air supply volume. Furthermore, the bottom plate 24 is inclined, which can increase the width of the bottom plate 24 without changing the width of the main combustion chamber 210, thus facilitating the setting of the air intake port 241 on the bottom plate 24.

[0060] Multiple air intake holes 241 are spaced along the length of the cavity bottom plate 24 to ensure uniform air supply and improve the uniformity of the mixed gas in the main combustion cavity 210.

[0061] like Figures 3 to 5 As shown, the burner includes an inner shell 1 and two outer shells 2 disposed on opposite sides of the inner shell 1. The inner shell 1 has an ejector channel 14 connecting to an intermediate combustion chamber 13, and the outer shells 2 have a main combustion chamber 210, or the outer shells 2 and the inner shell 1 enclose a main combustion chamber 210. This arrangement allows the burner to have only one ejector channel 14, simplifying the burner structure, reducing the complexity of the burner's gas supply structure, and lowering costs. The top of the outer shells 2 has the aforementioned side flame plates 22.

[0062] In one embodiment, the two outer shells 2 are separately arranged, with the inner shell 1 sandwiched between the two outer shells 2. This facilitates the processing of the outer shells 2 according to the structure of the main combustion chamber 210, improves the modularity of the outer shells 2, and reduces the processing difficulty of the outer shells 2. In other embodiments, one end of the two outer shells 2 along the length direction is integrally bent and connected, and the other end of the two outer shells 2 along the length direction is connected by riveting, snap-fitting, and / or welding, that is, the two outer shells 2 are integrally formed.

[0063] In one embodiment, the outer shell 2 surrounds and forms a circumferentially enclosed main combustion chamber 210. Multiple first through holes 121 are respectively opened on opposite sides of the inner shell 1. The side of the outer shell 2 facing the inner shell 1 is fitted with the inner shell 1 and has multiple second through holes 231. The second through holes 231 are directly opposite and communicate with the first through holes 121 on the same side to form gas vents. This arrangement facilitates ensuring the airtightness of the main combustion chamber 210 through the structural design of the outer shell 2 itself, reducing the fitting requirements and difficulty of fitting between the outer shell 2 and the inner shell 1. In other embodiments, the main combustion chamber 210 can also be formed by the outer walls of the outer shell 2 and the inner shell 1 enclosing each other; that is, the outer wall of the inner shell 1 partially forms the cavity wall of the main combustion chamber 210.

[0064] The inner shell 1 includes two opposing inner half-shell portions 12, which together form an ejector channel 14 and an intermediate combustion chamber 13. The inner shell 1 also includes an intermediate fire plate 11 connecting the two inner half-shell portions 12. The inner shell 1 is preferably integrally formed. The specific structure of the inner shell 1 can be designed with reference to existing technology, which is not the focus of this utility model and will not be limited or described in detail here.

[0065] The intermediate combustion chamber 13 includes multiple chambers connected sequentially from top to bottom. The width of these chambers gradually decreases from bottom to top in the direction of the burner width. This facilitates communication between the lowermost chamber and the ejector channel 14 while simultaneously reducing the width of the uppermost chamber, thereby increasing the upper width of the main combustion chamber 210. Simultaneously, this arrangement also causes the width of the main combustion chamber 210 to increase from bottom to top, which helps to slow down the velocity of the gas-mixed mixture exiting the main combustion chamber 210, avoiding combustion instability problems such as flame lift-off.

[0066] For example, the intermediate combustion chamber 13 includes a first chamber, a second chamber and a third chamber that are connected from bottom to top. The upper port of the third chamber is the upper port of the intermediate combustion chamber 13. In the height direction of the burner, the lower end of the main combustion chamber 210 extends to the first chamber. A first through hole 121 is provided on the cavity wall of the second chamber.

[0067] The outer shell 2 includes an outer side plate 21 and an inner side plate 23 that are opposite to and spaced apart. The inner side plate 23 is fitted and connected to the outer side wall of the inner shell 1 and has a second through hole 231. A side flame plate 22 is connected between the upper end of the inner side plate 23 and the upper end of the outer side plate 21, and a cavity bottom plate 24 is connected between the lower end of the inner side plate 23 and the lower end of the outer side plate 21. The inner side plate 23, the outer side plate 21, the cavity bottom plate 24, and the side flame plate 22 together form the main combustion chamber 210. This arrangement facilitates the connection between the outer shell 2 and the inner shell 1 and facilitates the processing of the outer shell 2. That is, the outer side plate 21 forms the outer cavity wall of the main combustion chamber 210, the inner side plate 23 forms the inner cavity wall of the main combustion chamber 210, and the cavity bottom plate 24 forms the bottom of the main combustion chamber 210.

[0068] The outer side plate 21 is bent at both ends along its length to form side end plate 28. The edges of the side fire plate 22, the cavity bottom plate 24, and the inner side plate 23 all abut against the side end plate 28, so that the side end plate 28 closes the two ends of the main combustion chamber 210 along its length. The side end plate 28 is folded outward to form a fixing edge 29, which fits against the outer wall of the inner shell 1. The two ends of the inner shell 1 along its length are sandwiched between the fixing edges 29 at the corresponding ends of the two outer shells 2.

[0069] It is worth noting that the assembly and fastening structure of the inner shell 1 and the outer shell 2 can be set with reference to the existing technology. This is not the focus of this utility model and will not be described in detail here.

[0070] In other embodiments, the outer shell 2 may not have an inner side plate 23, and the lower end of the side fire plate 22 extends downward to install a side portion, the upper end of the cavity bottom plate 24 extends upward to install a plate portion, the plate portion is fitted and fastened to the inner shell 1, and the outer shell 2 and the inner shell 1 together form the main combustion chamber 210.

[0071] In one embodiment, the lower end of the outer side plate 21 is folded inward to form a edging portion 25, and a slot is formed between the edging portion 25 and the outer side plate 21. The lower end of the cavity bottom plate 24 is connected to an insert plate portion 27, which is inserted into the slot and pressed between the outer side plate 21 and the edging portion 25.

[0072] Furthermore, the upper end of the outer side plate 21 is folded inward to form a folding plate 26, which fits against the outer side plate 21, and the upper end of the side flame plate 22 is connected to the lower end of the folding plate 26. In other embodiments, the side flame plate 22 may also be welded or riveted to the outer side plate 21.

[0073] In one embodiment, the outer casing 2 is integrally formed to reduce assembly difficulty. In other embodiments, some structures in the outer casing 2 may be welded or riveted.

[0074] This embodiment also provides a burner, including the aforementioned burner array. The burner provided in this embodiment can improve combustion stability, combustion completeness, and combustion safety.

[0075] This embodiment also provides a gas-fired water heater, including the aforementioned burner. The gas-fired water heater provided in this embodiment, by employing the aforementioned burner, can improve combustion stability, combustion completeness, and combustion safety, thereby enhancing the performance of the gas-fired water heater.

[0076] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0077] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A fire grate, characterized in that, The burner has an intermediate combustion chamber (13) and two main combustion chambers (210) disposed on opposite sides of the intermediate combustion chamber (13) along the width direction. When the burner is in operation, the primary air coefficient of the mixed gas in the main combustion chamber (210) is higher than that of the mixed gas in the intermediate combustion chamber (13). The primary air coefficients of the mixed air in the main combustion chamber (210) and the intermediate combustion chamber (13) are both less than 1. The burner is provided with a flame stabilizing hole (111) at the upper end of the intermediate combustion chamber (13) and communicates with the intermediate combustion chamber (13). The burner is provided with a main fire hole (221) at the upper end of each main combustion chamber (210) and communicates with the corresponding main combustion chamber (210). The total ventilation area of ​​the main fire hole (221) corresponding to each main combustion chamber (210) is greater than the total ventilation area of ​​the flame stabilizing hole (111).

2. The fire grate of claim 1, wherein, The total ventilation area of ​​the main combustion chamber (210) corresponding to the main flame hole (221) is S1, and the total ventilation area of ​​the flame stabilizing hole (111) is S2, where 2≤S1:S2≤4.

5.

3. The fire grate of claim 1, wherein, When the burner is in operation, the primary air coefficient of the mixed gas in the intermediate combustion chamber (13) is 0.4 to 0.6, and the primary air coefficient of the mixed gas in the main combustion chamber (210) is 0.7 to 0.

9.

4. The fire grate of claim 1, wherein, The top of the fire bar has a side fire plate (22) covering the upper end of the main combustion chamber (210). The side fire plate (22) is arranged in a one-to-one correspondence with the main combustion chamber (210). The side fire plate (22) has a plurality of main fire holes (221) along the length direction of the fire bar. The top of the fire bar has an intermediate fire plate (11) covering the upper end of the intermediate combustion chamber (13), and the intermediate fire plate (11) is provided with a plurality of flame stabilizing holes (111) at intervals along the length of the fire bar. The upper width of the intermediate combustion chamber (13) is less than or equal to the upper width of the main combustion chamber (210).

5. The fire grate of claim 4, wherein, The intermediate fire plate (11) is provided with a plurality of intermediate fire hole groups along its length direction. Each intermediate fire hole group includes a plurality of flame stabilizing fire holes (111) spaced apart along its length direction. The side fire plate (22) is provided with a plurality of side fire hole groups along its length direction. Each side fire hole group includes a plurality of main fire holes (221) spaced apart along its length direction. In the width direction of the fire row, one intermediate fire hole group is aligned with one side fire hole group of each of the two side fire plates (22). The total ventilation area of ​​each side fire hole group is greater than the total ventilation area of ​​the corresponding intermediate fire hole group.

6. The fire grill according to claim 5, characterized in that, The number of flame stabilizing holes (111) in each of the side flame hole groups is greater than the number of flame stabilizing holes (111) in the corresponding middle flame hole group; And / or, the flame stabilizing hole (111) and the main fire hole (221) are both elongated holes extending along the width direction of the fire row, and the width of the flame stabilizing hole (111) is smaller than the width of the main fire hole (221).

7. The fire rack according to any one of claims 1-6, characterized in that, The burner has an ejector channel (14), the intermediate combustion chamber (13) is connected to the ejector channel (14), and the intermediate combustion chamber (13) is connected to both main combustion chambers (210) so that part of the mixed gas in the intermediate combustion chamber (13) is diverted to the two main combustion chambers (210). The main combustion chamber (210) has an air inlet (241) on its wall that connects to the external environment.

8. The fire grill according to claim 7, characterized in that, The firebox includes an inner shell (1) and two outer shells (2). The inner shell (1) is sandwiched between the two outer shells (2). The inner shell (1) has the ejector channel (14), the intermediate combustion chamber (13) and the flame stabilizing hole (111). The outer shells (2) surround and form the main combustion chamber (210), or the outer shells (2) and the inner shell (1) surround and form the main combustion chamber (210). The top of the outer shells (2) is provided with the main flame hole (221).

9. The fire grill according to claim 8, characterized in that, The two outer shells (2) are separately arranged, and each outer shell (2) is surrounded by a circumferentially closed main combustion chamber (210). The inner shell (1) has multiple first through holes (121) on its opposite sides. The outer shell (2) facing the inner shell (1) is fitted with the inner shell (1) and has multiple second through holes (231). The second through holes (231) are corresponding to and connected to the first through holes (121) on the same side.

10. The fire rack according to any one of claims 1-6, characterized in that, The burner includes an outer plate portion (21) forming the outer cavity wall of the main combustion chamber (210), and the burner includes a side flame plate (22) covering the upper end of the main combustion chamber (210). The side flame plate (22) has a plurality of main flame holes (221), and the upper end of the outer plate portion (21) is higher than the upper end of the side flame plate (22). And / or, the burner includes a bottom plate (24) forming the bottom of the main combustion chamber (210), the bottom plate (24) being inclined from top to bottom in a direction away from the intermediate combustion chamber (13), and the bottom plate (24) having an air inlet (241).

11. The fire grill according to claim 10, characterized in that, The height difference between the upper end of the outer side plate (21) and the side fire plate (22) is h, where 1mm ≤ h ≤ 5mm.

12. A burner, characterized in that, Including the fire rack as described in any one of claims 1-11.

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