Inner ring fire cap and burner

Abstract

The application discloses an inner ring fire cover and a burner, and relates to the technical field of cooking utensils. The inner ring fire cover comprises a lower fire cover and an upper fire cover. The upper fire cover is detachably covered on the lower fire cover to form a plurality of main fire holes, auxiliary fire holes and a central cavity. The main fire holes are communicated with the central cavity and the outside. One of the bottom surface of the upper fire cover and the top surface of the lower fire cover is provided with a groove, and the other is provided with a protrusion. The upper fire cover is covered on the lower fire cover to insert the protrusion into the groove. A gap exists between the groove and the protrusion to form a shunt cavity. The shunt cavity is communicated with the main fire holes and the auxiliary fire holes. The shunt cavity is used for shunting the gas in the main fire holes to the auxiliary fire holes, so that the speed of the gas flowing in the main fire holes can be reduced, and the flame stabilization performance is improved. The auxiliary fire holes are communicated with the shunt cavity instead of being directly communicated with the central cavity, so that the radial depth of the auxiliary fire holes can be prevented from being too large, the gas flow speed in the auxiliary fire holes can be prevented from being too small, the wall thickness between the main fire holes and the auxiliary fire holes can be prevented from being too small, the requirement for a processing die is reduced, and the processing and manufacturing are more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooking utensils, in particular to an inner ring fire cover and a burner. BACKGROUND

[0002] The inner ring fire cover of the split type slot fire hole in the prior art has poor flame stability, and flame separation easily occurs under cold state and high pressure working conditions. In order to improve the flame stability, a flame stabilizing hole is usually arranged above the slot fire hole, the flame stabilizing hole has small diameter but large depth, and the flame stabilizing hole is in horizontal direction, so the flame stabilizing hole is easily blocked by liquid overflow, and the flame stabilizing hole is not easy to clean after being blocked. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defects of poor flame stability of the inner ring fire cover in the prior art, easy blocking of the flame stabilizing hole by liquid overflow, and difficulty in cleaning, and to provide an inner ring fire cover and a burner.

[0004] The present application solves the above technical problems by the following technical solutions:

[0005] The present application provides an inner ring fire cover, which comprises a lower fire cover and an upper fire cover, the upper fire cover is detachably covered on the lower fire cover to form a plurality of main fire holes, auxiliary fire holes and a central cavity, and the main fire holes are communicated with the central cavity and the outside.

[0006] One of the bottom surface of the upper fire cover and the top surface of the lower fire cover is provided with a groove, and the other is provided with a protrusion, the upper fire cover is covered on the lower fire cover to insert the protrusion into the groove, there is a gap between the groove and the protrusion to form a shunt cavity, the shunt cavity is communicated with the main fire holes and the auxiliary fire holes, and the shunt cavity is used for shunting the gas of the main fire holes to the auxiliary fire holes.

[0007] In the scheme, the inner ring fire cover is split type, one of the upper fire cover and the lower fire cover is provided with a groove, and the other is provided with a protrusion, the upper fire cover is covered on the lower fire cover to insert the protrusion into the groove, and a gap exists between the groove and the protrusion to form a shunt cavity, which is used for shunting the gas of the main fire hole to the auxiliary fire hole, so that the speed of the gas flowing in the main fire hole can be reduced, and the flame stabilizing performance of the inner ring fire cover is improved, and the auxiliary fire hole can also play a role of transferring fire between the main fire holes, so that the ignition is faster and is not easy to be extinguished. The auxiliary fire hole is communicated with the shunt cavity instead of being directly communicated with the central cavity, so that the radial depth of the auxiliary fire hole caused by the direct extension of the auxiliary fire hole to the shunt cavity can be avoided, the gas flow speed in the auxiliary fire hole is avoided to be too small, and the wall thickness between the main fire hole and the auxiliary fire hole is avoided to be too small, the requirement for the processing die is reduced, and the processing and manufacturing are more convenient. In addition, the upper fire cover and the lower fire cover can be disassembled, and after disassembly, the main fire hole, the auxiliary fire hole and the shunt cavity are convenient to clean. By inserting the protrusion into the groove, the radial displacement of the upper fire cover and the lower fire cover can also be limited, and the problems such as flame separation caused by displacement of the upper fire cover and the lower fire cover are avoided.

[0008] Preferably, the inner ring fire cover comprises a spacing part extending along the radial direction of the inner ring fire cover.

[0009] A plurality of spacing parts are arranged in an array along the circumference of the inner ring fire cover, and the main fire hole is formed between two adjacent spacing parts, and the auxiliary fire hole is arranged at the bottom surface of the spacing part and extends along the radial direction of the inner ring fire cover.

[0010] In the scheme, by arranging the auxiliary fire hole at the bottom surface of the spacing part, the auxiliary fire hole can be exposed when the upper fire cover and the lower fire cover are disassembled, which is more conducive to cleaning. The auxiliary fire hole located at the bottom surface of the spacing part is also not easy to be blocked by liquid overflow, avoiding the influence of the blocked fire hole on the fire burning of the inner ring fire cover. The spacing parts are arranged in an array along the circumference of the inner ring fire cover, the main fire hole is formed between two adjacent spacing parts, and the auxiliary fire hole is arranged at the bottom surface of the spacing part, so that the main fire hole and the auxiliary fire hole can be arranged in an interval along the circumference of the inner ring fire cover, so that the auxiliary fire hole can play a better flame stabilizing effect, and the transmission ability of the inner ring fire cover is better, the flame can be transmitted faster between the main fire holes when igniting, and the ignition time is fast and is not easy to be extinguished.

[0011] Preferably, the groove is arranged at the bottom surface of the spacing part, and in the radial direction of the inner ring fire cover, the groove is located at the middle part of the spacing part.

[0012] In the scheme, the recess is arranged on the bottom surface of the spacing part to expose the recess when the upper fire cover and the lower fire cover are disassembled, which is more conducive to cleaning. In the radial direction of the inner ring fire cover, the recess is arranged in the middle of the spacing part, so that the shunt cavity can communicate with the middle of the main fire hole, which is more conducive to guiding the gas of the auxiliary fire hole to the main fire hole. At the same time, arranging the recess in the middle of the spacing part is more conducive to the processing and manufacturing of the fire cover, and the recess and the protrusion can better limit the radial displacement.

[0013] Preferably, the recess extends in the circumferential direction of the inner ring fire cover, so that the shunt cavity communicates with a plurality of main fire holes.

[0014] In the scheme, the recess extends in the circumferential direction of the inner ring fire cover, so that the recess and the protrusion can better limit the radial displacement, and the shunt cavity communicating with a plurality of main fire holes can make the gas flow better between the main fire hole and the auxiliary fire hole, so that the flame stabilizing performance of the inner ring fire cover is better.

[0015] Preferably, the protrusion is arranged around the inner ring fire cover in the circumferential direction, and part of the protrusion is inserted into a plurality of main fire holes.

[0016] In the scheme, part of the protrusion is inserted into a plurality of main fire holes, so that the gas flowing through the main fire hole can be slowed down by the protrusion, and the flow rate of the gas is lower, which can achieve better flame stabilizing effect.

[0017] Preferably, the protrusion includes a first radial limiting surface, and the recess includes a second radial limiting surface, the first radial limiting surface and the second radial limiting surface are fitted to limit the radial displacement of the upper fire cover and the lower fire cover.

[0018] In the scheme, the limiting effect of the protrusion and the recess can be achieved by arranging the first radial limiting surface and the second radial limiting surface, which are fitted to limit the radial displacement of the upper fire cover and the lower fire cover, avoiding the problems such as flame deviation caused by the dislocation of the upper fire cover and the lower fire cover.

[0019] Preferably, the first radial limiting surface and the second radial limiting surface extend in the vertical direction.

[0020] In the scheme, the first radial limiting surface and the second radial limiting surface extend in the vertical direction, so that the first radial limiting surface and the second radial limiting surface are more stable in limiting, and the effect of limiting the radial displacement of the upper fire cover and the lower fire cover is better.

[0021] Preferably, the first radial limiting surface and the second radial limiting surface are arranged on one side of the recess close to the radial inner side of the inner ring fire cover, and the shunt cavity is arranged on one side of the recess close to the radial outer side of the inner ring fire cover.

[0022] In the scheme, by arranging the first radial limiting surface and the second radial limiting surface on one side of the groove close to the radial inner side of the inner ring fire cover, the gap between the protrusion and the groove is arranged on the other side of the groove close to the radial outer side of the inner ring fire cover, that is, the shunt cavity is arranged on the other side of the groove close to the radial outer side of the inner ring fire cover, so that the shunt cavity is closer to the gas outlet of the main fire hole, facilitating the communication between the shunt cavity and the auxiliary fire hole, and the flame stabilizing performance is better.

[0023] Preferably, the protrusion comprises a flow guide surface, and the flow guide surface and the groove form the shunt cavity.

[0024] In the scheme, by extending the flow guide surface in the horizontal direction, the shape of the protrusion is more simple, and the processing and manufacturing are more convenient. Meanwhile, the flow guide surface extending in the horizontal direction is also convenient for guiding the gas in the horizontal direction, and is more conducive to the gas flowing to the auxiliary fire hole, so that the flame stabilizing performance is better.

[0025] The application further provides a burner comprising the inner ring fire cover.

[0026] In the scheme, the burner has the same effect as the inner ring fire cover.

[0027] The positive progress effect of the application is that:

[0028] The inner ring fire cover is split type, one of the upper fire cover and the lower fire cover is provided with a groove, and the other is provided with a protrusion. The upper fire cover is combined with the lower fire cover to insert the protrusion into the groove. There is a gap between the groove and the protrusion to form a shunt cavity. The shunt cavity is used for shunting the gas of the main fire hole to the auxiliary fire hole, so that the speed of the gas flowing in the main fire hole can be reduced, and the flame stabilizing performance of the inner ring fire cover is improved. The auxiliary fire hole is communicated with the shunt cavity instead of being directly communicated with the central cavity, so that the auxiliary fire hole is prevented from being directly extended to the shunt cavity to cause the radial depth of the auxiliary fire hole to be too large, the gas flow speed in the auxiliary fire hole is prevented from being too small, and the wall thickness between the main fire hole and the auxiliary fire hole is prevented from being too small. The requirement for the processing die is reduced, and the processing and manufacturing are more convenient. In addition, the upper fire cover and the lower fire cover can be disassembled, and after disassembly, the main fire hole, the auxiliary fire hole and the shunt cavity are convenient for cleaning. By inserting the protrusion into the groove, the radial displacement of the upper fire cover and the lower fire cover is limited, and problems such as flame separation caused by displacement of the upper fire cover and the lower fire cover are avoided. BRIEF DESCRIPTION OF DRAWINGS

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

[0030] Figure 2 It is a schematic diagram of the three-dimensional structure of the upper fire cover according to an embodiment of the application.

[0031] Figure 3Fig. 6 is a perspective view of a lower flame cap according to an embodiment of the present application.

[0032] Figure 4 Fig. 7 is a cross-sectional perspective view of an inner ring flame cap according to an embodiment of the present application.

[0033] Figure 5 Fig. 8 is a cross-sectional view of the inner ring flame cap according to an embodiment of the present application.

[0034] Figure 6 Fig. 9 is a bottom view of an upper flame cap according to an embodiment of the present application.

[0035] Legend of reference signs:

[0036] Inner ring flame cap 100

[0037] Lower flame cap 200

[0038] Protrusion 210

[0039] First radial limiting surface 211

[0040] Flow guiding surface 212

[0041] Upper flame cap 300

[0042] Groove 310

[0043] Second radial limiting surface 311

[0044] Main flame hole 400

[0045] Auxiliary flame hole 500

[0046] Central cavity 600

[0047] Shunt cavity 700

[0048] Spacing portion 800

[0049] Protruding portion 900 DETAILED DESCRIPTION

[0050] The present application will be further described below by way of examples, but the present application is not limited to the following examples.

[0051] The present embodiment provides a burner, which includes an inner ring flame cap 100.

[0052] As Figures 1-6As shown, the inner ring fire cover 100 includes a lower fire cover 200 and an upper fire cover 300, the upper fire cover 300 is detachably covered on the lower fire cover 200 to form a plurality of main fire holes 400, auxiliary fire holes 500 and a central cavity 600, the main fire holes 400 are communicated with the central cavity 600 and the outside. One of the bottom surface of the upper fire cover 300 and the top surface of the lower fire cover 200 is provided with a groove 310, and the other is provided with a protrusion 210, the upper fire cover 300 is covered on the lower fire cover 200 to insert the protrusion 210 into the groove 310, and there is a gap between the groove 310 and the protrusion 210 to form a shunt cavity 700, the shunt cavity 700 is communicated with the main fire holes 400 and the auxiliary fire holes 500, and the shunt cavity 700 is used for shunting the gas in the main fire holes 400 to the auxiliary fire holes 500.

[0053] The inner ring fire cover 100 is split type, one of the upper fire cover 300 and the lower fire cover 200 is provided with a groove 310, and the other is provided with a protrusion 210, the upper fire cover 300 is covered on the lower fire cover 200 to insert the protrusion 210 into the groove 310, and there is a gap between the groove 310 and the protrusion 210 to form a shunt cavity 700, the shunt cavity 700 is used for shunting the gas in the main fire holes 400 to the auxiliary fire holes 500, so as to reduce the speed of the gas flowing in the main fire holes 400, and further improve the flame stabilization performance of the inner ring fire cover 100, the auxiliary fire holes 500 can also play a role in transmitting fire between the main fire holes 400, so that the inner ring fire cover 100 is ignited faster and is not easy to be extinguished. The auxiliary fire holes 500 are communicated with the shunt cavity 700 instead of being directly communicated with the central cavity 600, so as to avoid that the auxiliary fire holes 500 directly extend to the shunt cavity 700 to cause the radial depth of the auxiliary fire holes 500 to be too large, avoid that the gas flow speed in the auxiliary fire holes 500 is too small, and also avoid that the wall thickness between the main fire holes 400 and the auxiliary fire holes 500 is too small, the requirement for the processing die is reduced, and the processing and manufacturing are more convenient. In addition, the upper fire cover 300 and the lower fire cover 200 are detachable, and after being detached, the main fire holes 400, the auxiliary fire holes 500 and the shunt cavity 700 are easy to clean. By inserting the protrusion 210 into the groove 310, the radial displacement of the upper fire cover 300 and the lower fire cover 200 can also be limited, and the problems such as flame separation caused by the displacement of the upper fire cover 300 and the lower fire cover 200 are avoided.

[0054] In the embodiment, the main fire holes 400 and the auxiliary fire holes 500 are both slot type fire holes. In other embodiments, other shapes of the main fire holes 400 and the auxiliary fire holes 500 which are considered appropriate by those skilled in the art can also be selected.

[0055] The inner ring fire cover 100 comprises a spacing part 800 extending in the radial direction of the inner ring fire cover 100, a plurality of spacing parts 800 are arranged in an array in the circumferential direction of the inner ring fire cover 100, two adjacent spacing parts 800 form a main fire hole 400, and the auxiliary fire hole 500 is arranged on the bottom surface of the spacing part 800 and extends in the radial direction of the inner ring fire cover 100. By arranging the auxiliary fire hole 500 on the bottom surface of the spacing part 800, the auxiliary fire hole 500 can be exposed when the upper fire cover 300 and the lower fire cover 200 are disassembled, which is more conducive to cleaning. The auxiliary fire hole 500 on the bottom surface of the spacing part 800 is also not easy to be blocked by liquid overflow, avoiding the influence of fire hole blockage on the fire burning of the inner ring fire cover 100. The spacing part 800 is arranged in an array in the circumferential direction of the inner ring fire cover 100, two adjacent spacing parts 800 form a main fire hole 400, and the auxiliary fire hole 500 is arranged on the bottom surface of the spacing part 800, so that the main fire hole 400 and the auxiliary fire hole 500 can be arranged in the circumferential direction of the inner ring fire cover 100, and the auxiliary fire hole 500 can have a better flame stabilizing effect. The spacing arrangement of the main fire hole 400 and the auxiliary fire hole 500 can also make the inner ring fire cover 100 have better ignition ability, and the flame can be transmitted faster between the main fire holes 400 during ignition, so that the ignition time is fast and the flame is not easy to extinguish.

[0056] The groove 310 is arranged on the bottom surface of the spacing part 800, and in the radial direction of the inner ring fire cover 100, the groove 310 is located in the middle of the spacing part 800. By arranging the groove 310 on the bottom surface of the spacing part 800, the groove 310 can be exposed when the upper fire cover 300 and the lower fire cover 200 are disassembled, which is more conducive to cleaning. In the radial direction of the inner ring fire cover 100, the groove 310 is arranged in the middle of the spacing part 800, so that the shunt cavity 700 can communicate with the middle of the main fire hole 400, which is more conducive to guiding the gas in the auxiliary fire hole 500 to the main fire hole 400. At the same time, arranging the groove 310 in the middle of the spacing part 800 is more conducive to the processing and manufacturing of the inner ring fire cover 100, and the cooperation of the groove 310 and the protrusion 210 can better limit the radial displacement.

[0057] As shown in Figure 2 and Figure 6 , the width of the main fire hole 400 is B1, the width of the auxiliary fire hole 500 is B2, and the thickness A1, A2, A3 of the thinnest part of the wall of the upper fire cover 300 is less than 1, which can better meet the requirements of part processing die and is more conducive to the processing and manufacturing of the inner ring fire cover 100.

[0058] As shown in Figure 5As shown, the diameter of the main fire hole 400 gradually increases from the radial inner side to the radial outer side of the inner ring fire cover 100. The height of the main fire hole 400 close to the radial inner side is L1, and the height of the main fire hole 400 close to the radial outer side is L2, L1 < L2. The angle between the top surface and the bottom surface of the main fire hole 400 is a, 10°≤a≤15°. According to the Venturi principle, the flow rate of gas flowing through a small cross-section is large, and the flow rate of gas decreases when flowing from a small cross-section to a large cross-section. Therefore, the flow rate of gas close to the outlet end of the main fire hole 400 decreases, thereby improving the off-flame problem, that is, playing a role in slowing down the flow and stabilizing the flame.

[0059] As shown in the drawings, Figure 5 The depth of the auxiliary fire hole 500 is L3, and the height is h2, h2≤B2, 2.5*h2≤L3≤3*h2. Therefore, the depth of the auxiliary fire hole 500 is within a reasonable range, and the flow rate of the gas is maintained within a suitable combustion range, thereby achieving better flame stabilization effect.

[0060] As shown in the drawings, Figure 2 The groove 310 extends along the circumferential direction of the inner ring fire cover 100 to connect the plurality of main fire holes 400. By extending the groove 310 along the circumferential direction of the inner ring fire cover 100, the groove 310 and the protrusion 210 can better limit the radial displacement. The connection of the plurality of main fire holes 400 by the shunt cavity 700 can make the gas flow through the shunt cavity 700 better between the main fire hole 400 and the auxiliary fire hole 500, thereby improving the flame stabilization performance of the inner ring fire cover 100.

[0061] As shown in the drawings, Figure 3 The protrusion 210 is arranged along the circumferential direction of the inner ring fire cover 100, and part of the protrusion 210 is inserted into the plurality of main fire holes 400. Therefore, the protrusion 210 can slow down the flow of gas flowing through the main fire hole 400, so that the flow rate of the gas is lower, thereby achieving better flame stabilization effect.

[0062] In this embodiment, the protrusion 210 is continuously arranged along the circumferential direction of the inner ring fire cover 100. In other embodiments, the protrusion 210 can be divided into multiple segments, or other specific shapes of the protrusion 210 can be selected by those skilled in the art.

[0063] As shown in the drawings, Figures 2-4 The protrusion 210 includes a first radial limiting surface 211, and the groove 310 includes a second radial limiting surface 311. The first radial limiting surface 211 and the second radial limiting surface 311 are fitted to limit the radial displacement of the upper fire cover 300 and the lower fire cover 200. The limiting effect of the protrusion 210 and the groove 310 can be achieved by setting the first radial limiting surface and the second radial limiting surface 311. The first radial limiting surface and the second radial limiting surface 311 are fitted to limit the radial displacement of the upper fire cover 300 and the lower fire cover 200, thereby avoiding the off-flame problem caused by the misalignment of the upper fire cover 300 and the lower fire cover 200.

[0064] In the embodiment, the first radial limiting surface 211 and the second radial limiting surface 311 extend along the vertical direction, so that the first radial limiting surface 211 and the second radial limiting surface 311 are more stable in limiting, and the effect of limiting the radial displacement of the upper fire cover 300 and the lower fire cover 200 is better. In other embodiments, the first radial limiting surface 211 and the second radial limiting surface 311 can also extend obliquely, and those skilled in the art can select the appropriate extension direction of the first radial limiting surface 211 and the second radial limiting surface 311 according to the actual situation.

[0065] The first radial limiting surface 211 and the second radial limiting surface 311 are arranged on one side of the groove 310 close to the radial inner side of the inner ring fire cover 100, and the flow distribution cavity 700 is arranged on the other side of the groove 310 close to the radial outer side of the inner ring fire cover 100, so that the gap between the protrusion 210 and the groove 310 is located on the side of the groove 310 close to the radial outer side of the inner ring fire cover 100, that is, the flow distribution cavity 700 is arranged on the side of the groove 310 close to the radial outer side of the inner ring fire cover 100, so that the flow distribution cavity 700 is closer to the gas outlet of the main fire hole 400, facilitating the communication between the flow distribution cavity 700 and the auxiliary fire hole 500, and making the flame stabilizing performance better.

[0066] The protrusion 210 includes a flow guide surface 212, and the flow distribution cavity 700 is formed between the flow guide surface 212 and the groove 310. The flow guide surface 212 extends along the horizontal direction, so that the shape of the protrusion 210 is more simple and convenient for processing and manufacturing. At the same time, the horizontally extending flow guide surface 212 is also convenient for guiding the gas flow in the horizontal direction, which is more conducive to the gas flow to the auxiliary fire hole 500, and makes the flame stabilizing performance better.

[0067] As shown in Figure 5 In the embodiment, the inner side wall of the lower fire cover 200 protrudes to form a protruding portion 900 radially inward at the position below the gas inlet of the main fire hole 400, that is, d1

[0068] In the direction from the radial inner side to the radial outer side of the inner ring fire cover 100, the upper surface of the protruding portion 900 is inclined upward, so that the gas can be better guided into the lower side of the gas inlet of the main fire hole 400. Those skilled in the art can adjust the length L4 of the upper surface of the protruding portion 900 to make the gas flow rate within a suitable range, so as to improve the flame stabilizing effect.

[0069] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that the present application is only illustrated by way of example, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the scope of protection of the present application.

Claims

1. An inner ring fire cover characterized by, The inner ring fire cover comprises a lower fire cover and an upper fire cover, the upper fire cover is detachably covered on the lower fire cover to form a plurality of main fire holes, auxiliary fire holes and a central cavity, the main fire holes communicate with the central cavity and the outside; One of the bottom surface of the upper fire cover and the top surface of the lower fire cover is provided with a groove, and the other is provided with a protrusion, the upper fire cover is covered on the lower fire cover to insert the protrusion into the groove, there is a gap between the groove and the protrusion to form a shunt cavity, the shunt cavity communicates with the main fire holes and the auxiliary fire holes, the shunt cavity is used for shunting the gas of the main fire holes to the auxiliary fire holes, and the auxiliary fire holes do not directly communicate with the central cavity.

2. The inner ring flame cap of claim 1 wherein, The inner ring fire cover comprises a spacing part, and the spacing part extends along the radial direction of the inner ring fire cover; A plurality of spacing parts are arranged in an array along the circumferential direction of the inner ring fire cover, the main fire holes are formed between two adjacent spacing parts, the auxiliary fire holes are arranged on the bottom surface of the spacing part, and the auxiliary fire holes extend along the radial direction of the inner ring fire cover.

3. The inner ring flame cap of claim 2 wherein, The groove is arranged on the bottom surface of the spacing part, and in the radial direction of the inner ring fire cover, the groove is located in the middle of the spacing part.

4. The inner ring flame cap of claim 1 wherein, The groove extends along the circumferential direction of the inner ring fire cover, so that the shunt cavity communicates with a plurality of main fire holes.

5. The inner ring flame cap of claim 1 wherein, The protrusion is arranged around the inner ring fire cover in the circumferential direction, and part of the protrusion is inserted into a plurality of main fire holes.

6. The inner ring flame cap of claim 1 wherein, The protrusion comprises a first radial limiting surface, the groove comprises a second radial limiting surface, and the first radial limiting surface and the second radial limiting surface are in close contact to limit the radial displacement of the upper fire cover and the lower fire cover.

7. The inner ring flame cap of claim 6 wherein, The first radial limiting surface and the second radial limiting surface extend along the vertical direction.

8. The inner ring flame cap of claim 6 wherein, The first radial limiting surface and the second radial limiting surface are arranged on one side of the groove close to the inner side in the radial direction of the inner ring fire cover, and the shunt cavity is arranged on the other side of the groove close to the outer side in the radial direction of the inner ring fire cover.

9. The inner ring flame cap of claim 1 wherein, The protrusion comprises a flow guide surface, the flow guide surface and the groove form the shunt cavity, and the flow guide surface extends along the horizontal direction.

10. A burner characterized by, The inner ring fire cover comprises a lower fire cover and an upper fire cover, the upper fire cover is detachably covered on the lower fire cover to form a plurality of main fire holes, auxiliary fire holes and a central cavity, the main fire holes communicate with the central cavity and the outside;

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