Inner ring burner cap, including its burner and stove.

Abstract

This invention discloses an inner ring burner cap, a burner including the inner ring burner cap, and a stove. The inner ring burner cap includes a plurality of flame holes arranged around its axis. The inner ring burner cap includes a lower cover and an upper cover that are separable and interlocking along their height. Open slots are formed on the surface of the upper cover or the lower cover. These slots are closed by the interlocking surfaces of the opposing lower cover or upper cover, thus forming the flame holes. The extension direction of the slots from their inner inlet to their outer outlet is offset radially from the inner ring burner cap to form a relative outward spiral extension. This invention facilitates cleaning of the slots, reducing water droplet adhesion, and increases the extension distance of the flame holes, thereby improving flame stability performance within a limited size. During energy conversion, less energy is lost to the outside per unit time.

Description

Technical Field

[0001] This invention relates to an inner ring burner cap, a burner including the same, and a stove. Background Technology

[0002] In existing gas stoves, the burner holes of the inner ring burner cap are easily clogged by oil, spills, etc., making cleaning inconvenient. Furthermore, even after cleaning, water remaining in the holes (water easily adheres to sealed holes) can prevent ignition. In addition, due to limitations in the overall size of the burner head in actual product design, the cavity size for secondary air between the inner and outer ring burner caps is also limited. Therefore, the extension distance of the burner holes in existing inner ring burner caps is restricted, resulting in excessive gas flow velocity. This leads to poor flame stability under cold and high-pressure conditions, easily causing problems such as flame lift-off, low efficiency, and excessive flue gas emissions.

[0003] Among the existing methods for increasing the flame holes, the first is to increase the outer diameter of the inner ring flame cap. However, this reduces the cavity for secondary air between the inner and outer ring flame caps, leading to excessive smoke (insufficient secondary air causes incomplete combustion). Therefore, the size can only be increased to a limited extent. The second method is to reduce the inner diameter of the inner ring flame cap to increase the extension distance of the flame holes. However, this results in thin walls, insufficient strength, and the inability to process them with molds. Therefore, the size can only be reduced to a limited extent. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the inner ring flame cap in the prior art, which is not easy to clean and has poor flame stability.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] An inner ring flame cap includes a plurality of flame holes arranged around the axis of the inner ring flame cap. The inner ring flame cap includes a lower cover and an upper cover that are separable from each other along the height direction. An open slot is formed on the surface of the upper cover or the lower cover. The slot is closed by the splicing surface of the opposing lower cover or upper cover to form the flame holes. The extension direction of the slot from its inner inlet to its outer outlet is offset from the radial direction of the inner ring flame cap to form a relative outward spiral extension.

[0007] In this design, the separate upper and lower covers facilitate cleaning of the open slots, significantly reducing cleaning time. After cleaning in water, the water droplets adhere less strongly to the open slots, reducing the likelihood of water droplets remaining inside the ignition holes and preventing ignition failure. The design, with one slot matching the other side's spliced ​​surface, avoids the alignment issues of slots on both sides, preventing problems such as excessive smoke, backfire, and detonation.

[0008] On the other hand, by changing the slot, the relative position of the flame hole and the axis of the inner ring flame cap is altered, causing it to deviate from the axis and thus increasing the extension distance, i.e., the depth, of the flame hole. This achieves improved flame stabilization performance despite limited dimensions. The cost of the inner ring flame cap remains essentially the same as before (no increase in material usage). During energy conversion, less energy is lost to the outside per unit time. The open slot also facilitates the machining of the relatively outward-rotating slot and subsequent cleaning.

[0009] Preferably, the cross-sectional shape of the outer outlets exhibits varying extension heights in the direction surrounding the axis. The side of each outer outlet extending in the outward spiral direction has a longer extension height, while the side extending in the opposite direction has a shorter extension height. The side with the longer extension height of each outer outlet extends beyond the adjacent side with the shorter extension height in the axial direction. Due to the relative outward spiral arrangement, the flame from the burner hole is ejected towards the adjacent burner hole on the side of the outward spiral extension direction. Therefore, by setting different extension heights, the flame from the burner hole can cover the root of the flame of the adjacent burner hole on the side of its outward spiral extension direction in the height direction, thereby achieving a flame stabilization effect on the burner hole.

[0010] Preferably, the cross-sectional shape of the outer outlet is a quadrilateral shape with its upper or lower edge inclined in the direction of the axis. The quadrilateral shape can provide greater drag for the same cross-sectional area, which helps to reduce the combustion gas velocity and helps stabilize the flame.

[0011] Preferably, the cross-sectional shape of the interior of the slot is rectangular. A rectangular shape provides greater resistance than a circular or similar shape for the same cross-sectional area, helping to reduce combustion gas velocity and stabilize the flame.

[0012] Preferably, the cross-sectional shape of the outer outlet is a right-angled trapezoid. The right-angled trapezoid shape is simpler to manufacture and can ensure greater resistance to reduce gas velocity, thus helping to stabilize the flame.

[0013] Preferably, the adjacent slots have partial overlap and communication on the side closest to the inner inlet. This allows for an increase in the outward rotation angle of the slots while maintaining the same number of slots, thereby further extending the extension distance of the fire hole.

[0014] Preferably, the cross-sectional shape of the inner inlet exhibits varying extension heights in the direction surrounding the axis. The side of the cross-sectional shape of each inner inlet extending outwards is lower, and the side extending in the opposite direction is higher. The connection between adjacent slots is formed between the splicing surface and the higher part of the slot. This height difference causes the connection between adjacent slots to be narrowed by the higher part, thus blocking a portion of the gas flow in the overlapping area, allowing only a portion to flow into the adjacent slot. Therefore, by increasing the extension distance of the burner holes through overlap, it is possible to avoid affecting the stability of the gas flow in each burner hole and reduce mutual interference.

[0015] Preferably, the slot gradually extends upwards from the inner inlet to the outer outlet, the splicing surface is generally conical, and the end face of the slot formed by the sidewalls of the slot is also conical. The flame hole formed after the splicing surface and the slot extend upwards from the inside out. This can further increase the extension distance of the slot and the flame hole, improving flame stabilization. However, extending upwards will shorten the distance between the inner ring flame and the pot, leading to excessive smoke. Without raising the pot support, the upward extension distance is limited.

[0016] Preferably, a first annular limiting surface is formed on the splicing surface, and a second annular limiting surface is formed at a corresponding position on the groove end face. The slopes of the first and second limiting surfaces are different from the overall slope of the splicing surface or the groove end face. The first and second limiting surfaces can play a limiting role in the radial direction of the inner ring fire cover to ensure that the upper and lower covers are spliced ​​in the correct positions.

[0017] Preferably, the upper cover or the lower cover is provided with a positioning member protruding along the axial direction, and the corresponding position of the lower cover or the upper cover is provided with a receiving portion recessed along the axial direction. The positioning member and the receiving portion mutually limit each other in a plane perpendicular to the axial direction, and the positioning member and the receiving portion are separable along the axial direction. The positioning member and the receiving portion serve to guide the splicing and restrict relative rotation.

[0018] Preferably, the inner side of the upper cover has a protruding bump, and the positioning member is connected to the bump, wherein the ignition hole of the inner ring cap extends and passes through the bump. The bump has more material to increase the connection strength of the positioning member, and also increases the extension distance of the ignition hole, improving ignition stability.

[0019] Preferably, the slot is located on the upper cover, and the splicing surface is located on the lower cover. This makes the slot easier to clean when the upper cover is removed.

[0020] A burner includes a base, an outer ring flame cap, and an inner ring flame cap, with a lower cover connected to the base.

[0021] A stove, the stove including the inner ring burner cap.

[0022] The positive and progressive effects of this invention are as follows: on the one hand, it facilitates cleaning of the slots and reduces water droplet adhesion; on the other hand, it increases the extension distance of the flame holes, thereby achieving improved flame stabilization performance despite limited dimensions. Furthermore, during energy conversion, less energy is lost to the outside per unit time. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the inner ring flame cap according to a preferred embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the exploded structure of the inner ring flame cap according to a preferred embodiment of the present invention.

[0025] Figure 3 This is a side view of the inner ring fire cap according to a preferred embodiment of the present invention.

[0026] Figure 4 This is a cross-sectional view of the inner ring flame cap according to a preferred embodiment of the present invention.

[0027] Figure 5 This is a three-dimensional structural diagram of the lower cover body according to a preferred embodiment of the present invention.

[0028] Figure 6 This is a three-dimensional structural diagram of the upper cover body according to a preferred embodiment of the present invention.

[0029] Figure 7 This is a bottom view of the upper cover structure of a preferred embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram of the external rotation of the slot hole in a preferred embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the outer outlet of a preferred embodiment of the present invention.

[0032] Figure 10 This is a schematic diagram showing the overlapping of the inner inlet in a preferred embodiment of the present invention.

[0033] Figure 11 This is a schematic diagram of the inner inlet structure of a preferred embodiment of the present invention.

[0034] Figure 12 This is a schematic diagram of the burner according to a preferred embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures

[0036] Upper cover 100

[0037] Fire Hole 101

[0038] 102 slot end face

[0039] Slot 110

[0040] Inner Inlet 111

[0041] Outer Exit 112

[0042] 113 on one side of the direction of external rotation extension

[0043] 114 on the opposite side

[0044] 115 at a higher position

[0045] 116 at the lower end

[0046] Bump 120

[0047] Ignition port 130

[0048] Flame stabilizing hole 140

[0049] Positioning component 150

[0050] Second limiting ring 160

[0051] Lower cover 200

[0052] splicing surface 210

[0053] First limiting ring surface 220

[0054] Reception 230

[0055] Outer ring fire cap 300

[0056] Base 400

[0057] Axis O

[0058] External rotation direction X

[0059] Extension direction A

[0060] Radial B

[0061] Extended height c

[0062] Extended height d

[0063] Overlapping region E

[0064] Connecting point F Detailed Implementation

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

[0066] like Figures 1-11 As shown, a preferred embodiment of the present invention discloses an inner ring flame cap. Wherein, as... Figures 1-4 As shown, the inner ring flame cap of this embodiment includes a lower cover 200 and an upper cover 100 that are separable and connectable along the height direction. The upper cover 100 and the lower cover 200 together form the inner ring flame cap. The upper cover 100 and the lower cover 200 are connected by stacking, and can be separated by lifting the upper cover 100. In other embodiments, the upper cover 100 and the lower cover 200 can also be connected using known methods. The separate upper cover 100 and lower cover 200 facilitate cleaning of the open slots 110 and significantly reduce cleaning time. After cleaning the open slots 110 in water, the adhesion of water droplets is less, thus reducing the likelihood of water droplets adhering to the inside of the flame holes 101 and preventing ignition.

[0067] like Figure 2 , Figure 5 and Figure 6 As shown, the inner ring flame cap of this embodiment includes a plurality of flame holes 101 arranged around the axis O of the inner ring flame cap. A splicing surface 210 is formed on the side of the lower cover 200 facing the upper cover 100. An open slot 110 is formed on the surface of the upper cover 100. The slot 110 is closed by the splicing surface 210 of the opposite lower cover 200 to form the flame holes 101. In this embodiment, the flame hole 101 refers to a closed channel with open ends formed by the splicing surface 210 and the slot 110, while the slot 110 refers to a semi-closed channel not obstructed by the splicing surface 210. Therefore, the two are inclusive, and some of the guide lines in the figure simultaneously refer to the slot 110 and its associated flame hole 101. Furthermore, as... Figure 6 As shown, the open slot 110 also facilitates the machining of the relatively outward-rotating slot 110 and subsequent cleaning. In this embodiment, the slot 110 is only on the upper cover 100. Compared with directly dividing the fire hole 101 in half, this avoids alignment and fitting problems, as well as problems such as excessive smoke, backfire, and detonation caused by it.

[0068] like Figure 7 and Figure 8As shown, in this embodiment, the extension direction A of the slot 110 from its inner inlet 111 to its outer outlet 112 is offset relative to the radial direction B to form a relatively outward spiral extension. The distance traveled by the existing inner inlet 111 along the radial direction B is the existing extension distance of the slot. In this embodiment, due to the inclined setting of the extension direction A, as... Figure 8 The extension distance or depth of the slot 110 in the inner ring is increased. The larger the angle of inclination relative to the radial direction B, the greater the increase in the extension distance or depth of the slot 110. Thus, by changing the extension direction A of the slot 110, the relative position of the flame hole 101 and the axis O of the inner ring flame cap is changed radially by B, causing it to deviate from the axis O, thereby increasing the extension distance, i.e., the depth, of the flame hole 101. This achieves improved flame stabilization performance despite the limited dimensions. The cost of the inner ring flame cap remains basically the same as before (no increase in material usage).

[0069] Meanwhile, along the exhaust direction of the burner hole 101, the circle formed by the distance extending outward from the root of the burner hole 101 relative to the axis X constitutes the effective circle (energy efficiency effect) of the inner ring burner cap. Due to the inclined arrangement of the slot 110 and the burner hole 101, the distance range extending outward from the burner hole 101 in this embodiment is at an angle relative to the radial direction B. Therefore, for the same extension distance, the point of outward extension in this embodiment is closer to the axis X (due to the inclination, the distance component along the radial direction B is smaller than the outward extension distance). The resulting energy efficiency circle has a smaller diameter, meaning it is closer to the inside of the burner. During energy conversion, less energy is lost outward per unit time. According to the law of conservation of energy, Qtotal = Qeffective + Qloss. Since the total energy Qtotal remains unchanged, Qloss is reduced, thereby increasing Qeffective and improving energy efficiency. Furthermore, because the energy efficiency circle is smaller, the flame acts on the energy-efficient cookware for a longer time, which also contributes to improved energy efficiency.

[0070] like Figure 9 As shown, in a preferred embodiment, the cross-sectional shape of the outer outlet 112 has different extension heights in the direction surrounding the axis O. The side 113 of each outer outlet 112 in the outward spiral extension direction (outward spiral direction X) has a longer extension height d, while the side 114 in the opposite direction has a shorter extension height c. The side 114 with the longer extension height of each outer outlet 112 extends beyond the adjacent side 113 with the shorter extension height in the direction of the axis O; that is, the extension height d exceeds the extension height c in the direction of the axis O. Due to the relative outward spiral arrangement, the flame from the flame hole 101 will be ejected towards the adjacent flame hole 101 in the outward spiral extension direction (outward spiral direction X). Figure 9The flame is ejected from the adjacent flame hole 101 or slot 110 on the left side. By setting different extension heights, the flame of the flame hole 101 can cover the root of the flame of the adjacent flame hole 101 on the left side of its outward spiral extension direction in the height direction, thereby achieving the flame stabilization effect of the flame hole 101. Figure 9 The various fire holes 101 or slots 110 shown have the same shape, so the relative size relationship can be guaranteed simply by one side 113 of each slot 110 being larger than the other side 114. Of course, in other embodiments, the fire holes 101 or slots 110 have different shapes.

[0071] like Figure 9 As shown, in a preferred embodiment, the cross-sectional shape of the outer outlet 112 is such that its upper edge is in the direction of axis O (i.e., Figure 9 The shape is a sloping quadrilateral (in the vertical direction). Existing flame holes are generally circular. The flame hole 101 in this embodiment and the existing circular flame hole can have the same area, that is, the flame hole strength is the same. However, when the cross-sectional shape is different, the resistance coefficient is different; for rectangular or quadrilateral holes with the same area, the perimeter corresponding to the same area is longer, and its resistance coefficient is greater. From the perspective of flame stabilization, it is more conducive to flame stabilization. Moreover, due to the larger resistance coefficient, the larger perimeter is less likely to backfire, thus solving the problem of knocking when the flame is turned off.

[0072] Specifically, refer to Stokes' Law: the viscosity of a fluid causes resistance between the fluid and the solid sidewalls during flow, F = 6πηυR. In this formula, F is the resistance, R is the radius of the sphere, υ is its velocity relative to the liquid, and η is the viscosity coefficient of the liquid. This formula is called Stokes' Law. Transforming the formula F = 6πηυR, we get F = 3*(2πR)ηυ = 3Cηυ; where 2πR is the circumference C of the circle. Given the same initial fluid velocity V0, for cross-sections with equal cross-sections but different shapes, and the same flow length L, the reduction in outlet velocity V1 compared to V0 is affected by the resistance between the fluid and the cross-section sidewalls. The longer the perimeter of the cross-section, the larger the contact area between the flow path and the channel, the greater the resistance F, and the larger the velocity reduction ΔV = V0 - V1, meaning a greater velocity decrease at the outlet. According to the Stokes' Law resistance formula F = 6πηυR, a quadrilateral flame hole has greater resistance than a circular flame hole, which is more conducive to flame stabilization.

[0073] It can be seen that a quadrilateral shape can provide greater resistance for the same cross-sectional area, which helps to reduce the gas velocity and stabilize the flame. In other embodiments, if the slot 110 is provided on the upper cover, the cross-sectional shape of the corresponding outer outlet 112 is a quadrilateral shape with its lower edge inclined in the direction of axis O.

[0074] In a further preferred embodiment, the cross-sectional shape of the interior of the slot 110 is rectangular. A rectangular shape provides greater resistance than a circular or similar shape for the same cross-sectional area, helping to reduce combustion gas velocity and stabilize the flame.

[0075] like Figure 9 As shown, in a further preferred embodiment, the cross-sectional shape of the outer outlet 112 is a right-angled trapezoid. The right-angled trapezoid shape is simpler to manufacture and can ensure greater resistance to reduce gas velocity, thus helping to stabilize the flame. Of course, in other embodiments, a suitable shape can be set according to actual conditions.

[0076] like Figure 8 , Figure 10 and Figure 11 As shown, in a preferred embodiment, adjacent slots 110 may have partial overlap and communication on the side near the inner inlet 111. For example... Figure 10 As shown, there is an overlapping area E between the inner inlets 111 of adjacent slots 110. With a fixed number of slots 110, while tilting the slots 110 can increase their extension distance, it also increases the extension distance of the inner inlets 111 around the axis O. Therefore, by overlapping, the outward tilt angle of the slots 110 can be further increased without reducing the number of slots 110, thereby further extending the extension distance of the fire hole 101. Of course, in other embodiments, the slots 110 can also be completely non-overlapping and isolated from each other.

[0077] like Figure 11 As shown, in a further preferred embodiment, the cross-sectional shape of the inner inlet 111 extends to different heights in the direction surrounding the axis O. The side of the cross-sectional shape of each inner inlet 111 facing the outward spiral extension direction (outward spiral direction X) is the lower part 116, and the side of the cross-sectional shape of each outer outlet 112 facing the opposite outward spiral extension direction is the higher part 115. See details. Figure 11In the diagram, the left side of slot 110 (located in the direction of outward spiral extension, i.e., outward spiral direction X) is the lower point 116, and the right side is the higher point 115. The connection F between adjacent slots 110 is formed between the splicing surface 210 and the higher point 115 of slot 110. This height difference causes the connection F of the inner inlet 111 of adjacent slots 110 to be narrowed by the higher point 115. Essentially, the space below the connection F is blocked by the raised higher point 115 of the left slot 110. Consequently, a portion of the gas at the lower point 116 of the inner inlet 111 of the adjacent right slot 110 is blocked in the overlapping area E by the higher point 115 of the inner inlet 111 of the left slot 110, and only a portion flows into the adjacent slot 110. Therefore, by increasing the extension distance of the burner holes 101 through overlap, it is possible to avoid affecting the stability of the gas in each burner hole 101 and reduce mutual interference.

[0078] In the preferred embodiment described above, the inner inlet 111 of each slot 110 is configured to be one high and one low, thereby forming a continuous sawtooth shape (e.g. Figure 6 In other embodiments, the connection point F of the overlapping region E can also be narrowed by other structures, such as by adding wall structures extending in the overlapping region E to block part of the airflow.

[0079] like Figure 4 , Figure 5 and Figure 6 As shown, in a preferred embodiment, the slot 110 gradually extends upwards from the inner inlet 111 to the outer outlet 112. The splicing surface 210 is generally conical, and the slot end face 102 formed by the sidewalls of the slot 110 is also conical. The flame hole 101 formed after the splicing surface 210 and the slot 110 are joined extends upwards from the inside to the outside. This can further increase the extension distance of the slot 110 and the flame hole 101, improving the flame stabilization capability. However, extending upwards will shorten the distance between the inner ring flame and the pot, resulting in excessive smoke. Without raising the pot support, the upward extension distance is limited.

[0080] like Figure 5 and Figure 6As shown, in a preferred embodiment, a first annular limiting surface 220 is formed on the splicing surface 210, and a second annular limiting surface 160 is formed at the corresponding position on the groove end face 102. The slopes of the first limiting surface 220 and the second limiting surface 160 are different from the overall slope of the splicing surface 210 or the groove end face 102. The first limiting surface 220 and the second limiting surface 160 can play a limiting role in the radial direction of the inner ring fire cover to ensure that the upper cover 100 and the lower cover 200 are spliced ​​in the correct position. In a further preferred embodiment, both the first limiting surface 220 and the second limiting surface 160 are set as planes with a slope of 0. The overall slope in this preferred embodiment includes the slope of a straight line and the curvature of a curve. That is, the first limiting surface 220 and the second limiting surface 160 can also be in the form of curved surfaces to produce different overall slopes.

[0081] like Figure 4 , Figure 5 and Figure 6 As shown, in a preferred embodiment, the upper cover 100 is provided with a positioning member 150 protruding along the axis O, and the lower cover 200 is provided with a receiving portion 230 recessed along the axis O at a corresponding position. The positioning member 150 and the receiving portion 230 mutually limit each other in a plane perpendicular to the axis O, and the positioning member 150 and the receiving portion 230 are separable along the axis O. The positioning member 150 and the receiving portion 230 serve to guide the splicing and restrict relative rotation. In other embodiments, the positions of the positioning member 150 and the receiving portion 230 can be interchanged as needed. The number of positioning members 150 and the receiving portion 230 is not limited to one, and the corresponding number and position can be set according to actual needs. The positioning member 150 can be detachably connected to the upper cover 100 or the lower cover 200. For example, it can be connected by threads. A corresponding operating shape, such as a cross shape, can be provided on the surface of the positioning member for screwdriver installation and removal.

[0082] like Figure 4 , Figure 5 and Figure 6 As shown, in a further preferred embodiment, the inner side of the upper cover 100 has a protruding bump portion 120, and the positioning member 150 is connected to the bump portion 120. The ignition hole 130 of the inner ring burner cap extends and passes through the bump portion 120. The bump portion 120, on the one hand, has more material to increase the connection strength of the positioning member 150; on the other hand, the bump portion 120 also increases the extension distance of the ignition hole 130, improving ignition stability. Of course, in other embodiments, multiple bump portions 120 can be provided for both the setting of the ignition hole 130 and the installation of the positioning member 150.

[0083] This embodiment Figures 1-11The illustration shows an embodiment where the slot 110 is located on the upper cover 100 and the splicing surface 210 is located on the lower cover 200. This makes the slot 110 easier to clean when the upper cover 100 is removed. However, in other embodiments, the configuration can be reversed, with the upper cover 100 having the splicing surface and the lower cover 200 having the slot.

[0084] like Figure 12 As shown, this embodiment also discloses a burner, which includes a base 400, an outer ring burner cap 300, and an inner ring burner cap, with a lower cover 200 connected to the base 400. The inner ring burner cap of this embodiment can be used in stoves.

[0085] This invention facilitates cleaning of the slot 110, reducing water droplet adhesion, and increases the extension distance of the flame hole 101, thereby improving flame stabilization performance despite limited dimensions. Furthermore, it reduces energy loss to the outside per unit time during energy conversion.

[0086] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An inner ring flame cap, comprising a plurality of flame holes arranged circumferentially relative to the axis of the inner ring flame cap, characterized in that, The inner ring flame cap includes a lower cover and an upper cover that are separable and splicable to each other along the height direction. An open slot is formed on the surface of the upper cover or the lower cover. The slot is closed by the splicing surface of the opposite lower cover or the upper cover to form the flame hole. The extension direction of the slot from its inner inlet to its outer outlet is offset relative to the radial direction of the inner ring flame cap to form a relative outward spiral extension. The cross-sectional shape of the outer outlet has different extension heights in the direction surrounding the axis. The side of the cross-sectional shape of each outer outlet in the outward extension direction has a longer extension height, and the side in the opposite direction has a shorter extension height. The side of each outer outlet with a longer extension height extends beyond the side of the adjacent outer outlet with a shorter extension height in the direction of the axis.

2. The inner ring flame cap as described in claim 1, characterized in that, The cross-sectional shape of the outer outlet is a quadrilateral shape with the upper or lower edge inclined in the direction of the axis.

3. The inner ring flame cap as described in claim 2, characterized in that, The cross-sectional shape of the inside of the slot is rectangular.

4. The inner ring flame cap as described in claim 2, characterized in that, The cross-sectional shape of the outer outlet is a right trapezoid.

5. The inner ring flame cap as described in claim 1, characterized in that, The adjacent slots have partial overlap and connection on the side closest to the inner inlet.

6. The inner ring flame cap as described in claim 5, characterized in that, The cross-sectional shape of the inner inlet has different extension heights in the direction surrounding the axis. The side of the cross-sectional shape of each inner inlet in the direction of outward spiral extension is lower, and the side of the cross-sectional shape of each inner inlet in the opposite direction of outward spiral extension is higher. The connection between adjacent slots is formed between the splicing surface and the higher part of the slot.

7. The inner ring flame cap as described in claim 1, characterized in that, The slot gradually extends upwards from the inner inlet to the outer outlet. The splicing surface is generally conical in shape, and the end face of the slot formed by the sidewall of the slot is also conical. The fire hole formed after the splicing surface and the slot are spliced ​​together extends upwards from the inside to the outside.

8. The inner ring flame cap as described in claim 7, characterized in that, A first annular limiting ring is formed on the splicing surface, and a second annular limiting ring is formed at the corresponding position on the groove end face. The slopes of the first limiting ring and the second limiting ring are different from the overall slope of the splicing surface or the groove end face.

9. The inner ring flame cap as described in claim 1, characterized in that, The upper cover or the lower cover is provided with a positioning member protruding along the axis, and the corresponding position of the lower cover or the upper cover is provided with a receiving portion recessed along the axis. The positioning member and the receiving portion are mutually limited in a plane perpendicular to the axis, and the positioning member and the receiving portion are separable in the direction along the axis.

10. The inner ring flame cap as described in claim 9, characterized in that, The inner side of the upper cover has a protruding bump portion, and the positioning member is connected to the bump portion, wherein the ignition hole of the inner ring cap extends through the bump portion.

11. The inner ring flame cap as described in any one of claims 1-10, characterized in that, The slot is provided on the upper cover, and the splicing surface is provided on the lower cover.

12. A burner, characterized in that, The burner includes a base, an outer ring flame cap, and an inner ring flame cap as described in any one of claims 1-11, with the lower cap connected to the base.

13. A stove, characterized in that, The stove includes the inner ring burner as described in any one of claims 1-11.

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