Inner ring fire cover and combustor
By designing multiple grooves on the bottom of the inner ring fire cover to form groove fire holes, and increasing the gas outflow resistance through the inclined and horizontally arranged hole sections, the problems of poor coke stability and discharge in the prior art are solved, and better sealing and coke stability are achieved.
Patent Information
- Application Number
- CN202420628612.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-29
AI Technical Summary
The flame stability of the groove-type fire hole inner ring fire cover in the prior art is poor, and it is prone to leave the flame, and the weight of the fire cover is thin and easy to lose. It is easy to deviate during assembly, causing leakage or leave the flame, and the discharge liquid is easily entered into the burner.
An inner ring fire cover is designed, with a plurality of inwardly recessed grooves at the bottom of the upper fire cover, forming a groove fire hole, increasing the weight and stability of the upper fire cover, improving sealing and flame stability through gravity and structural design, and increasing the depth and resistance of the groove fire holes through inclined and horizontally arranged hole sections.
It improves the flame stability of the inner ring fire cover, reduces the occurrence of fire leakage or flame removal, prevents the discharge from entering the burner, and the fire cover is not easily lost or deformed, makes assembly more convenient, and the fire holes in the groove are easy to clean.
Smart Images
Figure CN222597713U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of stoves, in particular to an inner ring fire cover and a burner. Background Art
[0002] Traditional fire covers usually use an integrated cylindrical fire hole and a flame-stabilizing ring seam. The cylindrical fire hole and the flame-stabilizing ring seam are easily blocked by oil and dirt, and are not easy to clean. To facilitate cleaning, a split slot-type fire hole is usually used.
[0003] The inner ring fire cover of the split slot-type fire hole in the prior art has poor flame stability and is prone to flame separation under cold and high-pressure conditions. The upper fire cover is a thin plate, which is light in weight and easy to be lost and deformed by burning. The upper fire cover and the lower fire cover are easily misaligned when matched, causing the depth of the slot fire hole to change, resulting in fire leakage or flame separation. When assembling the upper fire cover and the lower fire cover, the upper fire cover and the lower fire cover are over-constrained, resulting in poor sealing and fire leakage. The slot fire hole is usually tilted upward, has poor flame stability, and is easy to flame separate. There is no obstruction above the slot fire hole. When there is overflow, the overflow can easily pass through the slot fire hole into the burner. Utility Model Content
[0004] The technical problem to be solved by the utility model is to overcome the defects of the inner ring fire cover of the slot-type fire hole in the prior art, which has poor flame stability, the upper fire cover is thin and easy to be lost and deformed by burning, the upper fire cover and the lower fire cover are easy to be misaligned when matched, resulting in fire leakage or flame separation, the slot fire hole is arranged obliquely upward, which has poor flame stability, and overflow liquid is easy to enter the inside of the burner through the slot fire hole, and an inner ring fire cover and a burner are provided.
[0005] The utility model solves the above technical problems through the following technical solutions:
[0006] The utility model discloses an inner ring fire cover, the inner ring fire cover comprises an upper fire cover and a lower fire cover, the bottom of the upper fire cover has a plurality of inwardly concave grooves, the upper fire cover can be detachably covered on the lower fire cover, so that a central cavity is formed between the upper fire cover and the lower fire cover, and a slot fire hole is formed through the groove, and the slot fire hole communicates the central cavity with the outside;
[0007] The top surface of the lower fire cover has a first inclined surface arranged obliquely upward along the radial inner side of the inner ring fire cover toward the radial outer side of the inner ring fire cover and a first plane arranged in the horizontal direction, and the bottom surface of the upper fire cover has a second inclined surface arranged obliquely upward along the radial inner side of the inner ring fire cover toward the radial outer side of the inner ring fire cover and a second plane arranged in the horizontal direction;
[0008] The first inclined surface and the second inclined surface are in contact with each other, and the first plane and the second plane are in contact with each other, so that the slot fire hole forms a first hole segment and a second hole segment which are sequentially arranged along the radial inner side of the inner ring fire cover to the radial outer side of the inner ring fire cover, the first hole segment is arranged obliquely upward along the radial inner side of the inner ring fire cover to the radial outer side of the inner ring fire cover, and the second hole segment is arranged horizontally.
[0009] In this solution, the inner ring fire cover sets the groove for forming the slot fire hole on the upper fire cover, so that the upper fire cover is heavier. Relying on the gravity of the upper fire cover, the upper fire cover and the lower fire cover are better sealed when they are matched. The upper fire cover and the lower fire cover are not easy to shift, avoiding leakage or flame separation caused by shifting, and the upper fire cover is not easy to be lost or deformed by burning. The upper fire cover and the lower fire cover are detachable, easy to disassemble and assemble, and the slot fire hole is easy to clean. The first inclined surface and the second inclined surface fit together, and the first plane and the second plane fit together, so that the bottom surface of the upper fire cover and the top surface of the lower fire cover fit more closely, improving the flame stability of the fire cover. The gas flows from the central cavity into the slot fire hole, and passes through the first hole section and the second hole section in sequence. The first hole section is set obliquely upward, and the second hole section is set horizontally, thereby increasing the depth of the slot fire hole, increasing the resistance of the gas flowing out of the slot fire hole, and improving the flame separation problem. The gas flows out horizontally at the outlet of the slot fire hole. When the gas is burned, it has a downward pressure on the flame, and the root flame at the outlet of the slot fire hole spreads to the left and right sides, improving the flame stability of the flame root. The horizontal setting of the slot fire hole can also effectively prevent overflow from entering the inside of the burner through the slot fire hole.
[0010] Preferably, a notch is provided at a junction of the first inclined surface and the first plane and / or a junction of the second inclined surface and the second plane.
[0011] In this solution, the notch provided at the junction can avoid the problems of poor sealing and fire leakage due to over-constraint when the upper fire cover and the lower fire cover are matched, improve the flame stability, and also facilitate the assembly of the upper fire cover and the lower fire cover.
[0012] Preferably, the top surface of the lower fire cover and / or the bottom surface of the upper fire cover further has a third plane, the third plane is vertically arranged, and the third plane cooperates with the first plane and / or the second plane to form the gap.
[0013] In this solution, the gap is formed by setting a third plane in the vertical direction. The third plane can cooperate with the first plane and / or the second plane to form the gap. The structure is simple and easy to manufacture and clean.
[0014] Preferably, the notch is connected to a plurality of the slot fire holes.
[0015] In this solution, the gap connects multiple slot fire holes, and the gas can flow in the multiple slot fire holes through the gap, so that the amount of gas in each slot fire hole can be adjusted, making the gas outlet of each slot fire hole more uniform, thereby improving the flame stability of the inner ring fire cover.
[0016] Preferably, the longitudinal cross-sectional areas of the first hole segment and the second hole segment are the same.
[0017] In this solution, the longitudinal cross-sectional areas of the first hole segment and the second hole segment are the same, so that the flow of the gas in the slot fire hole is more stable, the gas outlet of the slot fire hole is more stable, and the flame stability of the inner ring fire cover is improved.
[0018] Preferably, the plurality of slotted fire holes include a plurality of first slotted fire holes and a plurality of second slotted fire holes, the longitudinal cross-sectional area of the first slotted fire holes is larger than the longitudinal cross-sectional area of the second slotted fire holes, and the plurality of first slotted fire holes and the plurality of second slotted fire holes are cross-spaced along the circumference of the inner ring fire cover.
[0019] In this solution, the inner ring fire cover is provided with two types of slot fire holes, namely the first slot fire hole and the second slot fire hole. The two slot fire holes have different cross-sectional areas and are arranged at cross-intervals, so that the load of the slot fire holes is reasonable, the gas burns more completely, the smoke generated by the gas combustion is reduced, and the overall combustion efficiency of the inner ring fire cover is improved.
[0020] Preferably, the upper fire cover is provided with a plurality of flame stabilizing holes at intervals along the circumference of the upper fire cover, the flame stabilizing holes are provided above the slot fire holes, and the flame stabilizing holes connect the central cavity with the outside.
[0021] In this solution, a plurality of flame stabilizing holes are provided above the slot fire holes, thereby slowing down the flow rate of the fuel gas flowing through the slot fire holes, further playing a flame stabilizing role.
[0022] Preferably, the top of the upper fire cover horizontally extends outward along the circumference of the upper fire cover to form a flange, and the grooved fire hole is arranged below the flange.
[0023] In this solution, the flange provided above the slot fire hole can block the overflow, prevent the overflow from entering the slot fire hole, avoid the slot fire hole from being contaminated, and help the inner ring fire cover to keep clean. The flange can press the flame of the slot fire hole downward, further playing a role in stabilizing the flame.
[0024] Preferably, the inner ring fire cover further includes an ignition hole, and the flange extends outward above the ignition hole to form a protrusion.
[0025] In this solution, a protrusion is provided above the ignition hole, so that the ignition hole can be protected more specifically to prevent overflow from entering the ignition hole and affecting the ignition effect.
[0026] The utility model also provides a burner, which comprises the inner ring fire cover mentioned above.
[0027] In this embodiment, the burner includes the same effect as the inner ring fire cover described above.
[0028] The positive and progressive effects of the utility model are:
[0029] The utility model provides an inner ring fire cover and a burner. The inner ring fire cover sets a groove for forming a slot fire hole on the upper fire cover, so that the weight of the upper fire cover is greater. Relying on the gravity of the upper fire cover, the upper fire cover and the lower fire cover are better sealed when they are matched. The upper fire cover and the lower fire cover are not easy to shift, so as to avoid leakage or flame separation caused by shifting, and the upper fire cover is not easy to be lost or deformed by burning. The upper fire cover and the lower fire cover are detachable, convenient for disassembly and assembly, and the slot fire hole is easy to clean. The first inclined surface and the second inclined surface fit together, and the first plane and the second plane fit together, so that the bottom surface of the upper fire cover and the top surface of the lower fire cover fit more closely, improving the flame stability of the fire cover. The gas flows from the central cavity into the slot fire hole, and passes through the first hole section and the second hole section in sequence. The first hole section is set obliquely upward, and the second hole section is set horizontally, thereby increasing the depth of the slot fire hole, increasing the resistance of the gas flowing out of the slot fire hole, and improving the flame separation problem. The gas flows out horizontally at the outlet of the slot fire hole. When the gas is burned, it has a downward pressure on the flame, and the root flame at the outlet of the slot fire hole spreads to the left and right sides, improving the flame stability of the flame root. The horizontal setting of the slot fire hole can also effectively prevent overflow from entering the inside of the burner through the slot fire hole. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the inner ring fire cover according to an embodiment of the utility model.
[0031] Figure 2 It is a cross-sectional view of an inner ring fire cover according to an embodiment of the utility model.
[0032] Figure 3 for Figure 2 Magnified view of part A.
[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of the upper fire cover according to an embodiment of the utility model.
[0034] Figure 5 It is a schematic diagram of the three-dimensional structure of the lower fire cover according to an embodiment of the utility model.
[0035] Description of reference numerals:
[0036] Inner ring fire cover 100
[0037] Lower fire cover 200
[0038] The first inclined surface 210
[0039] First plane 220
[0040] Fire cover 300
[0041] The second inclined surface 310
[0042] Second plane 320
[0043] Flame stabilizing hole 330
[0044] Flanging 340
[0045] Protrusion 341
[0046] Groove 350
[0047] Gap 400
[0048] The third plane 410
[0049] Slot fire hole 500
[0050] First hole section 510
[0051] Second hole section 520
[0052] First slot fire hole 530
[0053] Second slot fire hole 540
[0054] Ignition hole 600
[0055] Center cavity 700 DETAILED DESCRIPTION
[0056] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.
[0057] This embodiment provides a burner, which includes an inner ring fire cover 100 .
[0058] like Figure 1-Figure 5 As shown, the inner ring fire cover 100 includes an upper fire cover 300 and a lower fire cover 200. The bottom of the upper fire cover 300 has a plurality of inwardly concave grooves 350. The upper fire cover 300 can be detachably covered on the lower fire cover 200, so that a central cavity 700 is formed between the upper fire cover 300 and the lower fire cover 200, and a slot fire hole 500 is formed through the groove 350, and the slot fire hole 500 connects the central cavity 700 and the outside. The inner ring fire cover 100 sets the groove 350 for forming the slot fire hole 500 on the upper fire cover 300, so that the weight of the upper fire cover 300 is greater. Relying on the gravity of the upper fire cover 300, the upper fire cover 300 and the lower fire cover 200 are better sealed when they are matched, and the upper fire cover 300 and the lower fire cover 200 are not easy to shift, so as to avoid leakage or flame separation caused by shifting, and the upper fire cover 300 is not easy to be lost or burned and deformed. The upper fire cover 300 and the lower fire cover 200 are detachable, and are convenient for disassembly and assembly, and the grooved fire hole 500 is easy to clean.
[0059] The top surface of the lower fire cover 200 has a first inclined surface 210 inclined upward along the radial inner side of the inner ring fire cover 100 toward the radial outer side of the inner ring fire cover 100 and a first plane 220 arranged in the horizontal direction, and the bottom surface of the upper fire cover 300 has a second inclined surface 310 inclined upward along the radial inner side of the inner ring fire cover 100 toward the radial outer side of the inner ring fire cover 100 and a second plane 320 arranged in the horizontal direction.
[0060] The first inclined surface 210 and the second inclined surface 310 are in contact with each other, and the first plane 220 and the second plane 320 are in contact with each other, so that the slot fire hole 500 forms a first hole segment 510 and a second hole segment 520 which are sequentially arranged along the radial inner side of the inner ring fire cover 100 to the radial outer side of the inner ring fire cover 100, the first hole segment 510 is arranged obliquely upward along the radial inner side of the inner ring fire cover 100 to the radial outer side of the inner ring fire cover 100, and the second hole segment 520 is arranged horizontally.
[0061] The first inclined surface 210 and the second inclined surface 310 are fitted together, and the first plane 220 and the second plane 320 are fitted together, so that the bottom surface of the upper fire cover 300 and the top surface of the lower fire cover 200 are more closely fitted, and the flame stability of the fire cover is improved. The gas flows from the central cavity 700 into the slot fire hole 500, and passes through the first hole section 510 and the second hole section 520 in sequence. The first hole section 510 is set obliquely upward, and the second hole section 520 is set horizontally, thereby increasing the depth of the slot fire hole 500, increasing the resistance of the gas flowing out of the slot fire hole 500, and improving the flame separation problem. The gas flows out in a horizontal direction at the outlet of the slot fire hole 500. When the gas is burned, it has a downward pressure on the flame. The root flame at the outlet of the slot fire hole 500 spreads to the left and right sides, and the flame stability of the flame root is improved. The horizontal arrangement of the slot fire hole 500 can also effectively prevent the overflow from entering the interior of the burner through the slot fire hole 500.
[0062] like Figure 2 As shown, in this embodiment, the length of the first hole section 510 is L2, the length of the second hole section 520 is L1, and L1 / L2=1 / 3. In other embodiments, other length ratios of the first hole section 510 and the second hole section that are considered appropriate by those skilled in the art may also be selected.
[0063] like Figure 2 and Figure 3 As shown, in the present embodiment, a notch 400 is provided at the junction of the second inclined surface 310 and the second plane 320, thereby avoiding problems of poor sealing and fire leakage due to over-constraint when the upper fire cover 300 and the lower fire cover 200 are matched, improving flame stability, and making it easier to assemble the upper fire cover 300 and the lower fire cover 200.
[0064] In other embodiments, a notch 400 may be provided at the junction of the first inclined surface 210 and the first plane 220, or a notch 400 may be provided at the junction of the first inclined surface 210 and the first plane 220 and at the junction of the second inclined surface 310 and the second plane 320. Other notch 400 settings deemed appropriate by those skilled in the art may also be selected.
[0065] In this embodiment, the bottom surface of the upper fire cover 300 also has a third plane 410, which is vertically arranged. The third plane 410 cooperates with the first plane 220 to form a notch 400, which has a simple structure and is easy to manufacture and clean.
[0066] In other embodiments, the top surface of the lower fire cover 200 may have a third plane 410, and the third plane 410 and the second plane 320 may cooperate to form a gap 400. Alternatively, the top surface of the lower fire cover 200 and the bottom surface of the upper fire cover 300 may both have a third plane 410, and the third plane 410 may cooperate with the first plane 220 and the second plane 320 to form a gap 400.
[0067] The gap 400 connects the multiple slot fire holes 500, and the gas can flow in the multiple slot fire holes 500 through the gap 400, so that the amount of gas in each slot fire hole 500 can be adjusted, so that the gas outlet of each slot fire hole 500 is more uniform, and the flame stability of the inner ring fire cover 100 is improved.
[0068] In this embodiment, the longitudinal cross-sectional areas of the first hole segment 510 and the second hole segment 520 are the same, so that the flow of the gas in the slot fire hole 500 is more stable, the gas outlet of the slot fire hole 500 is more stable, and the flame stability of the inner ring fire cover 100 is improved.
[0069] In other embodiments, the longitudinal cross-sectional areas of the first hole segment 510 and the second hole segment 520 may be different, and other longitudinal cross-sectional area settings deemed appropriate by those skilled in the art may also be selected.
[0070] like Figure 2 As shown, in this embodiment, the height of the first hole section 510 is B1, the height of the second hole section 520 is B2, and B1 = B2. In other embodiments, B1 and B2 may also be unequal.
[0071] The plurality of slotted fire holes 500 include a plurality of first slotted fire holes 530 and a plurality of second slotted fire holes 540 . The longitudinal cross-sectional area of the first slotted fire holes 530 is greater than the longitudinal cross-sectional area of the second slotted fire holes 540 . The first slotted fire holes 530 and the second slotted fire holes 540 are cross-spaced and arranged along the circumference of the inner ring fire cover 100 .
[0072] In this embodiment, the inner ring fire cover 100 is provided with two types of slot fire holes 500, namely a first slot fire hole 530 and a second slot fire hole 540. The cross-sectional areas of the two slot fire holes 500 are different and they are arranged at cross-intervals, so that the load of the slot fire holes 500 is reasonable, the gas burns more completely, the smoke generated by the gas combustion is reduced, and the overall combustion efficiency of the inner ring fire cover 100 is improved.
[0073] In other embodiments, one or more slotted fire holes 500 with different longitudinal cross-sectional areas may also be provided, and those skilled in the art may determine the arrangement of the slotted fire holes 500 according to actual needs.
[0074] The upper fire cover 300 is provided with a plurality of flame stabilizing holes 330 at intervals along the circumference of the upper fire cover 300 . The flame stabilizing holes 330 are arranged above the slot fire holes 500 . The flame stabilizing holes 330 connect the central cavity 700 with the outside world, thereby slowing down the flow rate of the fuel gas flowing through the slot fire holes 500 , and further playing a flame stabilizing role.
[0075] In this embodiment, flame stabilizing holes 330 are provided above both the first slotted fire hole 530 and the second slotted fire hole 540. In other embodiments, flame stabilizing holes 330 may be provided only above the first slotted fire hole 530 or the second slotted fire hole 540, or other arrangements of flame stabilizing holes 330 deemed appropriate by those skilled in the art may be selected.
[0076] In this embodiment, the heights of the flame stabilizing holes 330 above the first slot fire hole 530 and above the second slot fire hole 540 are different. In other embodiments, the heights of the flame stabilizing holes 330 above the first slot fire hole 530 and above the second slot fire hole 540 may be the same, or other settings of the flame stabilizing holes 330 deemed appropriate by other technicians in this field may be selected.
[0077] like Figure 2 As shown, in this embodiment, the width of the slotted flame hole 500 is b1, and the width of the flame stabilizing hole 330 is d, where d = b1. In other embodiments, other widths of the flame stabilizing hole 330 that are considered appropriate by those skilled in the art may also be selected.
[0078] The distance between the axis of the flame stabilizing hole 330 and the upper edge of the slotted flame hole 500 is h. In this embodiment, d≤h≤L2 / 2. In other embodiments, other positions of the flame stabilizing hole 330 that are considered appropriate by those skilled in the art may also be selected.
[0079] The top of the upper fire cover 300 extends horizontally outward along the circumference of the upper fire cover 300 to form a flange 340, and the slot fire hole 500 is arranged below the flange 340. The flange 340 arranged above the slot fire hole 500 can block the overflow, prevent the overflow from entering the slot fire hole 500, avoid the slot fire hole 500 from being contaminated, and is more conducive to keeping the inner ring fire cover 100 clean. The flange 340 can press the flame of the slot fire hole 500 downward, further playing a role in stabilizing the flame.
[0080] The inner ring fire cover 100 also includes an ignition hole 600, and the flange 340 extends outward above the ignition hole 600 to form a protrusion 341. The protrusion is arranged above the ignition hole 600, so that the ignition hole 600 can be protected more specifically to prevent overflow from entering the ignition hole 600 and affecting the ignition effect.
[0081] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship of the device or component in normal use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation at any time, and therefore cannot be understood as a limitation on the present invention in this regard.
[0082] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.
Claims
1. An inner ring fire cover, characterized in that: The inner ring fire cover comprises an upper fire cover and a lower fire cover, the bottom of the upper fire cover has a plurality of inwardly concave grooves, the upper fire cover can be detachably covered on the lower fire cover, so that a central cavity is formed between the upper fire cover and the lower fire cover, and a slot fire hole is formed through the groove, and the slot fire hole communicates the central cavity with the outside; The top surface of the lower fire cover has a first inclined surface arranged obliquely upward along the radial inner side of the inner ring fire cover toward the radial outer side of the inner ring fire cover and a first plane arranged in the horizontal direction, and the bottom surface of the upper fire cover has a second inclined surface arranged obliquely upward along the radial inner side of the inner ring fire cover toward the radial outer side of the inner ring fire cover and a second plane arranged in the horizontal direction; The first inclined surface and the second inclined surface are in contact with each other, and the first plane and the second plane are in contact with each other, so that the slot fire hole forms a first hole segment and a second hole segment which are sequentially arranged along the radial inner side of the inner ring fire cover to the radial outer side of the inner ring fire cover, the first hole segment is arranged obliquely upward along the radial inner side of the inner ring fire cover to the radial outer side of the inner ring fire cover, and the second hole segment is arranged horizontally.
2. The inner ring fire cover according to claim 1, characterized in that: A notch is provided at a junction of the first inclined surface and the first plane and / or a junction of the second inclined surface and the second plane.
3. The inner ring fire cover according to claim 2, characterized in that: The top surface of the lower fire cover and / or the bottom surface of the upper fire cover further has a third plane, which is vertically arranged and cooperates with the first plane and / or the second plane to form the gap.
4. The inner ring fire cover according to claim 2, characterized in that: The notch is connected to a plurality of the slot fire holes.
5. The inner ring fire cover according to claim 1, characterized in that: The first hole segment and the second hole segment have the same longitudinal cross-sectional area.
6. The inner ring fire cover according to claim 1, characterized in that: The plurality of slot fire holes include a plurality of first slot fire holes and a plurality of second slot fire holes, the longitudinal cross-sectional area of the first slot fire holes is larger than the longitudinal cross-sectional area of the second slot fire holes, and the plurality of first slot fire holes and the plurality of second slot fire holes are arranged crosswise and spaced along the circumference of the inner ring fire cover.
7. The inner ring fire cover according to claim 1, characterized in that: The upper fire cover is provided with a plurality of flame stabilizing holes at intervals along the circumference of the upper fire cover, the flame stabilizing holes are arranged above the slot fire holes, and the flame stabilizing holes communicate with the central cavity and the outside.
8. The inner ring fire cover according to claim 1, characterized in that: The top of the upper fire cover horizontally extends outward along the circumference of the upper fire cover to form a flange, and the grooved fire hole is arranged below the flange.
9. The inner ring fire cover according to claim 8, characterized in that: The inner ring fire cover also includes an ignition hole, and the flange extends outward above the ignition hole to form a protrusion.
10. A burner, characterized in that: It comprises an inner ring fire cover as described in any one of claims 1-9.