Inner ring fire cover and combustor

Abstract

The utility model provides an inner ring fire cover and a combustor, and relates to the technical field of cooking utensils. The inner ring fire cover comprises an upper fire cover and a lower fire cover, the upper fire cover detachably covers the lower fire cover to form a center cavity and a plurality of groove fire holes, the top face of the lower fire cover is provided with a limiting part protruding outwards, and the bottom face of the upper fire cover is provided with a limiting groove which is concave inwards and matched with the limiting part. The limiting part is inserted into the limiting groove to limit relative movement of the upper burner cap and the lower burner cap, so that deviation of the upper burner cap and the lower burner cap is prevented, targeted key protection on the ignition hole is facilitated, the ignition effect is improved, flame separation or fire leakage caused by deviation can be avoided, and the external environment interference resistance is higher. The limiting parts and the limiting grooves are simple in structure and convenient to manufacture, and production cost is saved. The bottom face of the limiting groove is provided with an inwards-concave groove, the top face of the limiting part is attached to the bottom face of the limiting groove, so that an ignition hole is formed in the groove, the ignition hole is detachable, and cleaning of the ignition hole is facilitated after the ignition hole is blocked by oil dirt or overflowing liquid.

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] In order to solve the cleaning problem of the inner ring fire cover in the prior art, a common method is to make a slotted fire cover with upper and lower parts, but the ignition hole is still a closed round hole. After being blocked by oil or overflow, the ignition hole is still inconvenient to clean. After the fire cover is cleaned, water droplets will be hidden in the ignition hole, resulting in no fire. The water droplets in the closed small hole are not easy to clear and are not easy for users to find, which can easily lead to problems such as false alarm repairs.

[0003] There are two main positioning methods for the upper and lower split structures of the inner ring fire cover. One is that the upper fire cover has no limit structure, and the upper and lower fire covers cannot be limited. There is no targeted key protection at the ignition hole and the fire protection hole. When encountering a large overflow, it is easy to be extinguished, affecting normal use, affecting the ignition effect, and having poor resistance to external environmental interference. The other uses a positioning pin and a positioning hole structure to limit the upper and lower split structures, which is more complex and more expensive. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art that the inner ring fire cover is difficult to clean, the upper fire cover and the lower fire cover are easily offset to cause flame separation or fire leakage, the ignition effect is poor, and the existing limiting structure is relatively complex. 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 provides an inner ring fire cover, which comprises an upper fire cover and a lower fire cover, wherein the upper fire cover is detachably covered on the lower fire cover to form a central cavity and a plurality of slot fire holes, wherein the slot fire holes communicate with the central cavity and the outside;

[0007] The top surface of the lower fire cover has a limiting portion protruding outward, and the bottom surface of the upper fire cover has a limiting groove that is recessed inward and matches the limiting portion. The limiting portion is inserted into the limiting groove to limit the relative movement of the upper fire cover and the lower fire cover. The bottom surface of the limiting groove has an inwardly recessed groove, and the top surface of the limiting portion fits the bottom surface of the limiting groove so that the groove forms an ignition hole.

[0008] In the present solution, the inner ring fire cover includes an upper fire cover and a lower fire cover. The top surface of the lower fire cover has a limiting portion protruding outward, and the bottom surface of the upper fire cover has a limiting groove recessed inward. The limiting portion is inserted into the limiting groove to limit the relative movement of the upper fire cover and the lower fire cover, thereby preventing the upper fire cover and the lower fire cover from being displaced, which is beneficial for targeted key protection of the ignition hole, improving the ignition effect, and also avoiding flame separation or fire leakage caused by displacement, thereby enhancing the flame stabilization performance of the inner ring fire cover and having a stronger ability to resist interference from the external environment. The limiting portion and the limiting groove have a simple structure, are easy to manufacture, and save production costs. At the same time, the bottom surface of the limiting groove has an inwardly recessed groove, and the top surface of the limiting portion fits the bottom surface of the limiting groove so that the groove forms an ignition hole, thereby making the ignition hole detachable, which is convenient for cleaning the ignition hole after being blocked by oil or overflow.

[0009] Preferably, the limiting portion has first circumferential limiting surfaces on both sides, and the limiting groove has second circumferential limiting surfaces on both sides, and the first circumferential limiting surfaces and the second circumferential limiting surfaces fit together to limit the circumferential rotation of the upper fire cover and the lower fire cover.

[0010] In the present scheme, the first circumferential limiting surface and the second circumferential limiting surface fit together to limit the circumferential rotation of the upper fire cover and the lower fire cover, thereby facilitating targeted key protection at the ignition hole position to avoid loss of protection of the ignition hole position due to circumferential deviation, such as extinguishing the fire by overflow, and also to avoid flame separation or fire leakage caused by circumferential deviation, and have a stronger ability to resist external interference.

[0011] Preferably, the ignition hole is provided with a first part and a second part in sequence from the radial inner side of the inner ring fire cover to the radial outer side of the inner ring fire cover, the first part and the second part are connected to each other, and the longitudinal cross-sectional area of ​​the second part is larger than the longitudinal cross-sectional area of ​​the first part.

[0012] In this solution, the longitudinal cross-sectional area of ​​the second part of the ignition hole is larger than that of the first part. The gas flows from the central cavity through the first and second parts in sequence and then flows out of the ignition hole. According to the Venturi principle, when the gas flows from the first part to the second part with a larger cross-sectional area, the gas flow rate decreases, thereby increasing the gas concentration near the ignition needle and improving the ignition success rate. At the same time, it can also increase the backfire resistance, reduce the backfire noise, and improve the user experience when using it.

[0013] Preferably, the upper ignition cover further has a slow flow slit and a drainage hole, the slow flow slit is arranged above the ignition hole, and the drainage hole connects the ignition hole and the slow flow slit.

[0014] In this solution, the drainage hole can drain the gas in the ignition hole to the slow-flow gap above, and diffuse it to the vicinity of the ignition needle through the slow-flow gap, so as to slow down the flow and reduce the pressure under high pressure. The gas can also be drained to the vicinity of the ignition needle head to ensure that the gas concentration is high near the discharge tip of the ignition needle head, thereby improving the ignition success rate.

[0015] Preferably, the ignition hole further includes a drainage portion, the top of which has a drainage surface inclined 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 the drainage hole is connected to the drainage portion.

[0016] In the present embodiment, the top of the drainage portion has a drainage surface which is inclined upward along the radial inner side of the inner ring fire cover toward the radial outer side of the inner ring fire cover. Since the top surface of the drainage portion is inclined upward, it is beneficial to drain the gas upward, resulting in a better drainage effect, making it easier for the gas to diffuse to the vicinity of the ignition needle head, thereby improving the ignition success rate.

[0017] Preferably, the slow flow slot is arranged on the circumferential outer side of the inner ring fire cover, and the slow flow slot includes an arc surface, and the center of the arc surface is located on the radial outer side of the inner ring fire cover.

[0018] In this scheme, since the ignition needle is located radially outside the inner ring fire cover, the center of the arc surface of the slow flow gap is located radially outside the inner ring fire cover, which is beneficial to directing the gas to the vicinity of the ignition needle, increasing the gas concentration near the discharge tip of the ignition needle head, and improving the ignition success rate.

[0019] Preferably, the ignition hole comprises a main ignition hole and a plurality of auxiliary ignition holes, and the plurality of auxiliary ignition holes are respectively arranged on both sides of the main ignition hole.

[0020] In this solution, multiple auxiliary ignition holes are provided on both sides of the main ignition. The auxiliary ignition holes serve to assist the ignition of the main ignition hole. The auxiliary ignition holes can supplement the main ignition hole with the gas required for ignition, making the gas concentration near the ignition hole higher and improving the ignition success rate.

[0021] Preferably, two ignition grooves extending in the vertical direction are provided on the outer peripheral side of the inner ring fire cover, the ignition grooves are located on both sides of the main ignition hole, and the ignition grooves are connected to the auxiliary ignition hole.

[0022] In this scheme, two ignition grooves extending in the vertical direction are provided on both sides of the main ignition hole. The ignition grooves are connected to the auxiliary ignition holes, so that the gas from the auxiliary ignition holes on both sides can be diverted toward the main ignition hole, thereby increasing the gas concentration near the main ignition hole and improving the ignition effect of the inner ring fire cover.

[0023] Preferably, the top of the upper fire cover extends horizontally outward along the circumference of the upper fire cover to form a flange, and the portion of the flange located above the ignition hole extends outward to form a protrusion.

[0024] In this solution, the protruding portion of the flange is located above the ignition hole, which is conducive to targeted protection of the ignition hole, preventing overflow from entering the ignition hole, avoiding contamination of the ignition hole, and is more conducive to keeping the inner ring fire cover clean.

[0025] The utility model provides a burner, which comprises the inner ring fire cover mentioned above.

[0026] In this embodiment, the burner includes the same effect as the inner ring fire cover described above.

[0027] The positive and progressive effects of the utility model are:

[0028] The utility model provides an inner ring fire cover and a burner, wherein the inner ring fire cover comprises an upper fire cover and a lower fire cover, the top surface of the lower fire cover has a limiting portion protruding outward, and the bottom surface of the upper fire cover has a limiting groove recessed inward, the limiting portion is inserted into the limiting groove to limit the relative movement of the upper fire cover and the lower fire cover, thereby preventing the upper fire cover and the lower fire cover from being displaced, which is beneficial for targeted key protection of the ignition hole, improving the ignition effect, and also avoiding flame separation or fire leakage caused by displacement, enhancing the flame stabilization performance of the inner ring fire cover, and having a stronger ability to resist interference from the external environment. The limiting portion and the limiting groove have a simple structure, are easy to manufacture, and save production costs. At the same time, the bottom surface of the limiting groove has an inwardly recessed groove, and the top surface of the limiting portion fits the bottom surface of the limiting groove so that the groove forms an ignition hole, thereby making the ignition hole detachable, which is convenient for cleaning the ignition hole after being blocked by oil or overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the inner ring fire cover and the ignition needle according to an embodiment of the utility model.

[0030] Figure 2 It is an exploded view of an inner ring fire cover according to an embodiment of the utility model.

[0031] Figure 3 It is a cross-sectional view of an inner ring fire cover according to an embodiment of the utility model.

[0032] 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.

[0033] Figure 5 It is a side view of an upper fire cover according to an embodiment of the utility model.

[0034] Figure 6 It is a transverse cross-sectional view of an upper fire cover according to an embodiment of the utility model.

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of the lower fire cover according to an embodiment of the utility model.

[0036] Description of reference numerals:

[0037] Inner ring fire cover 100

[0038] Lower fire cover 200

[0039] Limiting portion 210

[0040] The first circumferential limiting surface 211

[0041] The first radial limiting surface 220

[0042] Lower flame stabilizing tank 230

[0043] Fire cover 300

[0044] Limiting slot 310

[0045] The second circumferential limiting surface 311

[0046] Groove 312

[0047] The second radial limiting surface 320

[0048] Flanging 330

[0049] Protrusion 331

[0050] Upper flame stabilizing ring seam 340

[0051] Slot fire hole 400

[0052] Ignition hole 500

[0053] Main ignition hole 510

[0054] Part 1511

[0055] Part 2512

[0056] Drainage section 513

[0057] Drainage surface 515

[0058] Auxiliary ignition hole 520

[0059] Ignition slot 530

[0060] Slow flow seam 600

[0061] Arc surface 610

[0062] Drainage hole 700

[0063] Center cavity 800

[0064] Ignition needle 900 DETAILED DESCRIPTION

[0065] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0066] This embodiment provides a burner, which includes an ignition needle 900 and an inner ring fire cover 100 .

[0067] like Figure 1-Figure 3 As shown, the inner ring fire cover 100 includes an upper fire cover 300 and a lower fire cover 200. The upper fire cover 300 can be detachably covered on the lower fire cover 200 to form a central cavity 800 and a plurality of slot fire holes 400. The slot fire holes 400 connect the central cavity 800 with the outside.

[0068] The top surface of the lower fire cover 200 has a limiting portion 210 protruding outward, and the bottom surface of the upper fire cover 300 has a limiting groove 310 that is concave inward and matches the limiting portion 210. The limiting portion 210 is inserted into the limiting groove 310 to limit the relative movement of the upper fire cover 300 and the lower fire cover 200, thereby preventing the upper fire cover 300 and the lower fire cover 200 from being offset, which is conducive to targeted key protection of the ignition hole 500, improves the ignition effect, and can also avoid flame separation or fire leakage caused by offset, and has a stronger ability to resist interference from the external environment. The limiting portion 210 and the limiting groove 310 have a simple structure, are easy to manufacture, and save production costs.

[0069] The bottom surface of the limiting groove 310 has an inwardly recessed groove 312, and the top surface of the limiting portion 210 fits the bottom surface of the limiting groove 310 so that the groove 312 forms an ignition hole 500, thereby making the ignition hole 500 detachable and facilitating the cleaning of the ignition hole 500 after it is blocked by oil or overflow.

[0070] like Figure 4 and Figure 7 As shown, the limiting portion 210 has a first circumferential limiting surface 211 on both sides, and the limiting groove 310 has a second circumferential limiting surface 311 on both sides. The first circumferential limiting surface 211 and the second circumferential limiting surface 311 fit together to limit the circumferential rotation of the upper fire cover 300 and the lower fire cover 200, thereby facilitating targeted key protection at the position of the ignition hole 500, avoiding the ignition hole 500 position from losing protection due to circumferential deviation, such as extinguishing the fire by overflow, and also avoiding flame separation or fire leakage caused by circumferential deviation, and having a stronger ability to resist external interference.

[0071] In this embodiment, a first radial limiting surface 220 is provided on the top surface of the lower fire cover 200, and a second radial limiting surface 320 is provided on the bottom surface of the upper fire cover 300. The first radial limiting surface 220 and the second radial limiting surface 320 fit together to limit the radial displacement of the upper fire cover 300 and the lower fire cover 200, thereby enhancing the radial limiting effect of the inner ring fire cover 100, avoiding flame separation or fire leakage caused by deviation, enhancing the flame stabilization performance of the inner ring fire cover 100, and making it more resistant to external interference.

[0072] like Figure 3 As shown, the ignition hole 500 is provided with a first part 511 and a second part 512 in sequence from 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 part 511 and the second part 512 are connected to each other, and the longitudinal cross-sectional area of ​​the second part 512 is larger than the longitudinal cross-sectional area of ​​the first part 511.

[0073] The longitudinal cross-sectional area of ​​the second part 512 of the ignition hole 500 is larger than the longitudinal cross-sectional area of ​​the first part 511. The gas passes through the first part 511 and the second part 512 in sequence from the central cavity 800 and then flows out of the ignition hole 500. According to the Venturi principle, when the gas flows from the first part 511 to the second part 512 with a larger cross-sectional area, the gas flow rate decreases, thereby increasing the gas concentration near the ignition needle 900 and improving the ignition success rate. At the same time, it can also increase the backfire resistance, reduce the backfire noise, and improve the user experience when using it.

[0074] In this embodiment, the ignition hole 500 is divided into a first portion 511 and a second portion 512 with different longitudinal cross-sectional areas. In other embodiments, the ignition hole 500 may also be divided into more segments with different longitudinal cross-sectional areas, and the longitudinal cross-sectional area of ​​each segment increases from the radial inner side of the inner ring fire cover 100 to the radial outer side of the inner ring fire cover 100. The ignition hole 500 may also be set as a segment with a continuously changing longitudinal cross-sectional area, or other longitudinal cross-sectional arrangement methods of the ignition hole 500 deemed appropriate by those skilled in the art may also be selected.

[0075] The ignition hole 500 includes a main ignition hole 510 and multiple auxiliary ignition holes 520. The multiple auxiliary ignition holes 520 are respectively arranged on both sides of the main ignition hole 510. The auxiliary ignition holes 520 serve to assist the main ignition hole 510 in ignition. They can supplement the main ignition hole 510 with the gas required for ignition, make the gas concentration near the ignition hole 500 higher, and improve the ignition success rate.

[0076] In this embodiment, an auxiliary ignition hole 520 is provided on both sides of the main ignition hole 510. In other embodiments, multiple auxiliary ignition holes 520 may be provided on both sides, or other auxiliary ignition holes 520 locations and numbers deemed appropriate by those skilled in the art may be selected.

[0077] like Figure 3 As shown, the upper ignition cover 300 also has a slow flow slit 600 and a drainage hole 700. The slow flow slit 600 is arranged above the ignition hole 500. The drainage hole 700 connects the ignition hole 500 and the slow flow slit 600. The drainage hole 700 can drain the gas in the ignition hole 500 to the slow flow slit 600 above, and diffuse it to the vicinity of the ignition needle 900 through the slow flow slit 600, so as to slow down the flow and reduce the pressure under high pressure, and can also drain the gas to the vicinity of the head of the ignition needle 900, to ensure that the gas concentration is high near the discharge tip of the head of the ignition needle 900, thereby improving the ignition success rate.

[0078] In this embodiment, the drainage hole 700 is vertically arranged and shallow, so that the drainage hole 700 is not easily blocked, ensuring the drainage effect. In other embodiments, the drainage hole 700 can also be inclined, or other drainage hole 700 arrangement directions deemed appropriate by those skilled in the art can be selected.

[0079] In this embodiment, both the main ignition hole 510 and the auxiliary ignition hole 520 are provided with a drainage hole 700 connected to the slow flow slot 600. In other embodiments, only the main ignition hole 510 may be connected to the slow flow slot 600 through the drainage hole 700, and the number of drainage holes 700 deemed appropriate by other persons skilled in the art may also be selected.

[0080] The ignition hole 500 further includes a drainage portion 513, the top of which has a drainage surface 515 that tilts 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 the drainage hole 700 is connected to the drainage portion 513. Since the top surface of the drainage portion 513 tilts upward, it is beneficial to drain the gas upward, and the drainage effect is better, so that the gas can be more easily diffused to the vicinity of the head of the ignition needle 900, thereby improving the ignition success rate.

[0081] In this embodiment, the drainage portion 513 is disposed between the first portion 511 and the second portion 512, and the drainage portion 513 connects the first portion 511 and the second portion 512. In other embodiments, the drainage portion 513 may also be disposed at other positions that are considered appropriate by those skilled in the art.

[0082] In this embodiment, the drainage surface 515 is a plane. In other embodiments, the drainage surface 515 may also be a curved surface, or other drainage surface 515 structures considered appropriate by those skilled in the art may be selected.

[0083] like Figure 4-Figure 6 As shown, the slow flow slot 600 is arranged on the circumferential outer side of the inner ring fire cover 100, and the slow flow slot 600 includes an arc surface 610, and the center of the arc surface 610 is located on the radial outer side of the inner ring fire cover 100. Since the ignition needle 900 is located on the radial outer side of the inner ring fire cover 100, the center of the arc surface 610 of the slow flow slot 600 is located on the radial outer side of the inner ring fire cover 100, which is conducive to guiding the gas to the vicinity of the ignition needle 900, increasing the gas concentration near the discharge tip of the ignition needle 900 head to a higher level, thereby improving the ignition success rate.

[0084] like Figure 5 As shown, the height of the slow flow slot 600 is h0, 0.5mm≤h0≤1mm, and the distance between the lower edge of the slow flow slot 600 and the upper end surface of the ignition hole 500 is h1, 1mm≤h1≤1.5mm. h1 should not be too large, otherwise the depth of the drainage hole 700 will be too large, resulting in too much resistance, and the kinetic energy of the gas will be too reduced to reach the vicinity of the needle pole of the ignition needle 900; h1 should not be too small, otherwise the thickness of the material between the slow flow slot 600 and the lower ignition hole 500 will be too small, and deformation will easily occur at high temperature, affecting the service life of the inner ring fire cover 100.

[0085] like Figure 6As shown, the gas of the slow flow gap 600 is supplied by three drainage holes 700, the diameter of the drainage hole 700 is d, and the technical personnel in this field can select the size of d according to the needs. The three drainage holes 700 are in the same straight line and the distance from the outer diameter of the inner ring fire cover 100 is h2, 2mm≤h2≤3mm. The radius of the arc surface 610 is R, and the technical personnel in this field can select the size of R according to the needs. The center of the circle is A, and point A is the position of the axis of the ignition needle 900. The arc surface 610 can gather the gas in the direction of the ignition needle 900 to improve the ignition effect.

[0086] like Figure 1 and Figure 2 As shown, two ignition grooves 530 extending in the vertical direction are provided on the outer peripheral side of the inner ring fire cover 100. The ignition grooves 530 are located on both sides of the main ignition hole 510. The ignition grooves 530 are connected to the auxiliary ignition holes 520, so that the gas of the auxiliary ignition holes 520 on both sides can be diverted toward the main ignition hole 510, thereby increasing the gas concentration near the main ignition hole 510 and improving the ignition effect of the inner ring fire cover 100.

[0087] In this embodiment, the ignition groove 530 is in an arc shape. In other embodiments, it can also be in a folded surface shape, or other shapes of the ignition groove 530 that are considered appropriate by those skilled in the art can be selected.

[0088] The top of the upper fire cover 300 extends horizontally outward along the circumference of the upper fire cover 300 to form a flange 330, and the portion of the flange 330 located above the ignition hole 500 extends outward to form a protrusion. The protrusion of the flange 330 is located above the ignition hole 500, which is conducive to targeted key protection of the ignition hole 500, preventing overflow from entering the ignition hole 500, avoiding the ignition hole 500 from being contaminated, and more conducive to keeping the inner ring fire cover 100 clean.

[0089] like Figure 1 As shown, in the present embodiment, a plurality of lower flame stabilizing grooves 230 are provided at intervals along the circumference of the lower fire cover 200. The lower flame stabilizing grooves 230 are provided below the slot fire hole 400 and are connected with the slot fire hole 400, thereby playing a pulling effect on the flame at the root of the slot fire hole 400, and improving the flame stabilizing performance of the inner ring fire cover 100.

[0090] An upper flame-stabilizing annular seam 340 is provided on the outer peripheral side of the upper fire cover 300, and the upper flame-stabilizing annular seam 340 is partially connected with the slot fire, and the upper top surface of the upper flame-stabilizing annular seam 340 is at least partially flush with the upper top surface of the slot fire hole 400, thereby being able to pull the flame at the root of the slot fire hole 400 to enhance the flame-stabilizing effect, and also facilitating the gas to flow between the slot fire holes 400 through the upper flame-stabilizing annular seam 340, thereby making the combustion more uniform and the flame-stabilizing effect better.

[0091] The upper flame-stabilizing ring seam 340 is partially connected to the ignition hole 500, so that the gas concentration in the ignition hole 500 is higher, and the ignition success rate is improved. After the ignition hole 500 is ignited, the flame can ignite the slot fire holes 400 on the left and right sides more quickly through the upper flame-stabilizing ring seam 340, making the circumferential fire transfer speed of the inner ring fire cover 100 faster.

[0092] 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.

[0093] 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, wherein the upper fire cover is detachably covered on the lower fire cover to form a central cavity and a plurality of slot fire holes, wherein the slot fire holes communicate with the central cavity and the outside; The top surface of the lower fire cover has a limiting portion protruding outward, and the bottom surface of the upper fire cover has a limiting groove that is recessed inward and matches the limiting portion. The limiting portion is inserted into the limiting groove to limit the relative movement of the upper fire cover and the lower fire cover. The bottom surface of the limiting groove has an inwardly recessed groove, and the top surface of the limiting portion fits the bottom surface of the limiting groove so that the groove forms an ignition hole.

2. The inner ring fire cover according to claim 1, characterized in that: The limiting portion has first circumferential limiting surfaces on both sides, and the limiting groove has second circumferential limiting surfaces on both sides. The first circumferential limiting surfaces and the second circumferential limiting surfaces fit together to limit the circumferential rotation of the upper fire cover and the lower fire cover.

3. The inner ring fire cover according to claim 1, characterized in that: The ignition hole is provided with a first part and a second part in sequence from the radial inner side of the inner ring fire cover to the radial outer side of the inner ring fire cover, the first part and the second part are connected to each other, and the longitudinal cross-sectional area of ​​the second part is larger than the longitudinal cross-sectional area of ​​the first part.

4. The inner ring fire cover according to claim 1, characterized in that: The upper ignition cover also has a slow flow slit and a drainage hole. The slow flow slit is arranged above the ignition hole, and the drainage hole connects the ignition hole and the slow flow slit.

5. The inner ring fire cover according to claim 4, characterized in that: The ignition hole also includes a drainage portion, the top of which has a drainage surface inclined 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 the drainage hole is connected to the drainage portion.

6. The inner ring fire cover according to claim 4, characterized in that: The slow flow slot is arranged on the circumferential outer side of the inner ring fire cover, and the slow flow slot includes an arc surface, and the center of the arc surface is located on the radial outer side of the inner ring fire cover.

7. The inner ring fire cover according to claim 1, characterized in that: The ignition holes include a main ignition hole and a plurality of auxiliary ignition holes, and the plurality of auxiliary ignition holes are respectively arranged on both sides of the main ignition hole.

8. The inner ring fire cover according to claim 7, characterized in that: Two ignition grooves extending in a vertical direction are provided on the outer peripheral side of the inner ring fire cover, the ignition grooves are located on both sides of the main ignition hole, and the ignition grooves are connected to the auxiliary ignition hole.

9. 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 portion of the flange located above the ignition hole extends outward 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.

Images