Fire cover structure and stove applying fire cover structure

Abstract

The invention relates to a fire cover structure and a stove applying the fire cover structure, which comprises an inner ring fire cover with a fire retaining hole, a thermocouple which is arranged beside the inner ring fire cover and is opposite to the fire retaining hole, and a fire retaining block with the fire retaining hole, the annular wall of the inner ring fire cover is provided with an installation notch which is matched with the fire retaining block in size and used for embedding the fire retaining block, and the fire retaining block can move back and forth in the radial direction of the inner ring fire cover relative to the installation notch so as to change the distance between the gas outlet end of the fire retaining hole and the thermocouple. Compared with the prior art, the temperature of the thermocouple can be changed, and the electromotive force of the thermocouple can be adjusted to cope with different cooking scenes (different fire powers, different pot sitting states and the like), so that the electromotive force of the thermocouple is always kept in a proper range, and accidental flameout caused by too low electromotive force is avoided; or over-high electromotive force affects the service life of the thermocouple.

Description

Technical Field

[0001] This invention relates to the field of stoves, and more particularly to a burner cap structure and a stove using the burner cap structure. Background Technology

[0002] A stove thermocouple protection device is a kitchen safety device, mainly composed of a thermocouple and a solenoid valve. It controls the gas passage by sensing the flame status. Its working principle is as follows: when the flame is ignited, the thermocouple is heated and generates a thermoelectric potential, which drives the solenoid valve to maintain the gas passage; after the flame is extinguished, the thermoelectric potential disappears, and the solenoid valve resets to cut off the gas supply. Examples include Chinese invention patent application number CN202511067410.2 (publication number CN120740079A) and Chinese utility model patent number ZL202421944837.7 (authorization announcement number CN222895158U).

[0003] However, the electromotive force (EMF) of a thermocouple varies greatly depending on the heat level, the pot's position, the gas pressure, and even the ambient environment. If the EMF at the thermocouple head is too low, its interference resistance is poor, making it prone to accidental flameout; if the EMF is too high, the thermocouple head temperature becomes excessively high, easily causing it to overheat and reducing its lifespan. To address these issues, the EMF under different conditions is typically tested during the product design phase. Through design optimization, the EMF is maintained within a relatively suitable range under typical cooking conditions.

[0004] Furthermore, in actual cooking scenarios, different users have vastly different dietary and cooking habits, regional gas supply conditions, and kitchen airflow environments, resulting in a complex interplay of factors affecting the electromotive force. In different scenarios, the flame state at the flame arrestor hole varies, and the position of the thermocouple head within the flame arrestor also differs (for example, sometimes the thermocouple head is in the inner flame of the flame arrestor, and sometimes in the outer flame), thus exhibiting a large fluctuation range in the electromotive force. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a thermocouple electromotive force structure with adjustable magnitude and good adjustment effect compared with the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a stove that applies the above-mentioned burner cap structure in contrast to the prior art.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: a flame cap structure, including an inner ring flame cap with a flame-keeping hole and a thermocouple disposed on the side of the inner ring flame cap and opposite to the flame-keeping hole, characterized in that it further includes a flame-keeping block with the flame-keeping hole, and the inner ring flame cap has an installation notch on its ring wall that matches the size of the flame-keeping block and allows the flame-keeping block to be embedded, and the flame-keeping block can move back and forth radially along the inner ring flame cap relative to the installation notch to change the distance between the gas outlet end of the flame-keeping hole and the thermocouple.

[0008] Furthermore, the flame-keeping holes include at least two flame-keeping holes with different diameters, and the flame-keeping block is rotatably installed in the mounting notch, and can be rotated to align the different flame-keeping holes with the upper end of the thermocouple. By rotating the flame-keeping block to align the different flame-keeping holes with the upper end of the thermocouple, the temperature at the thermocouple can be changed (the larger the flame-keeping hole, the greater the airflow, and the higher the combustion temperature; conversely, the smaller the flame-keeping hole, the smaller the airflow, and the lower the combustion temperature, etc.). Combined with the movement of the flame-keeping block, the temperature at the thermocouple can be better adjusted according to different cooking scenarios, thereby better regulating the electromotive force of the thermocouple.

[0009] Furthermore, each of the aforementioned flame-preserving holes includes a main flame-preserving hole and an auxiliary flame-preserving hole with a smaller diameter. When any flame-preserving hole is aligned with the upper end of the thermocouple, the corresponding main flame-preserving hole is aligned with the upper end of the thermocouple, while the auxiliary flame-preserving hole is located below the main flame-preserving hole. By setting a main flame-preserving hole with a larger diameter and aligning it with the upper end of the thermocouple, flame-preserving performance is ensured. The auxiliary flame-preserving hole stabilizes the flame of the main flame-preserving hole during normal operation and ensures its flame-preserving effect by supplementing sufficient combustion gas. When the main flame-preserving hole becomes blocked, the auxiliary flame-preserving hole heats the thermocouple, ensuring its normal operation and thus improving the reliability of the inner ring flame cap.

[0010] Furthermore, each main flame-retardant hole corresponds to two auxiliary flame-retardant holes, located on either side of the main flame-retardant hole. The channels of each auxiliary flame-retardant hole are inclined from the inside outwards towards the corresponding main flame-retardant hole relative to the inner ring flame cap's annular wall. By providing two auxiliary flame-retardant holes, the flame stabilization effect of the main flame-retardant hole can be improved, while also ensuring a better flame-retardant effect. Furthermore, when the main flame-retardant hole becomes blocked, the flames from the auxiliary flame-retardant holes on both sides can converge at the blocked main flame-retardant hole, thus better ensuring the normal operation of the thermocouple even when the main flame-retardant hole is blocked.

[0011] Furthermore, there are three flame-protecting holes. The main flame-protecting holes are arranged in an equilateral triangle array, and there are three auxiliary flame-protecting holes also arranged in an equilateral triangle array. Each auxiliary flame-protecting hole is located between two adjacent main flame-protecting holes. The flame-protecting block can rotate circumferentially around the center line of the array formed by the main flame-protecting holes. This configuration allows for better alignment of different flame-protecting holes with the upper end of the thermocouple by rotating the flame-protecting block. Only three auxiliary flame-protecting holes are needed to meet the requirement of two auxiliary flame-protecting holes for each main flame-protecting hole, simplifying the internal structure of the flame-protecting block and facilitating temperature adjustment at the thermocouple.

[0012] Furthermore, the flame-protecting block is cylindrical in shape and radially arranged along the inner ring of the flame cap. Each main flame-protecting hole extends along the axis of the flame-protecting block and is arranged around the axis of the block. Correspondingly, the mounting notch is a circular channel formed on the inner ring of the flame cap. The flame-protecting block can rotate relative to the mounting notch around its own axis and can move back and forth relative to the mounting notch along its length. Thus, by rotating and moving the flame-protecting block, the distance between the flame-protecting hole and the thermocouple can be adjusted, and the relative positions of different flame-protecting holes and the upper ends of the thermocouples can be adjusted.

[0013] Furthermore, the outer circumferential surface of the fire-preserving block is provided with external threads, while the wall of the mounting notch is provided with internal threads that can form a threaded connection with the external threads. It also includes a drive mechanism for driving the fire-preserving block to rotate. Thus, when the drive mechanism drives the fire-preserving block to rotate, the fire-preserving block can simultaneously move along its own length.

[0014] Furthermore, the driving mechanism includes a drive motor, a first transmission gear, and a second transmission gear meshing with the first transmission gear. The output shaft of the drive motor extends vertically, while a horizontally extending mounting rod is fixed to the rear end of the fire-preserving block. The first transmission gear is mounted on the output shaft, and the second transmission gear is mounted on the mounting rod. In this way, the drive motor drives the first transmission gear to rotate, which in turn drives the mounting rod to rotate, thereby causing the fire-preserving block to rotate, thus realizing the driving mechanism's control over the fire-preserving block.

[0015] Furthermore, the outer circumferential surface of the fireproof block is provided with circumferentially spaced positioning ball groups that correspond one-to-one with each fireproof hole. Each positioning ball group is provided with retractable positioning balls spaced axially, and the number of positioning balls in each positioning ball group is at least equal to the number of fireproof holes and corresponds one-to-one with each fireproof hole. The inner circumferential surface of the mounting notch is provided with positioning grooves for each positioning ball to be inserted.

[0016] In the initial state, one of the positioning balls is engaged in the positioning groove, while the remaining positioning balls retract and abut against the inner circumferential surface of the mounting notch. As the flame-protecting block moves under the drive mechanism, the positioning ball moves out of the positioning groove and retracts against the inner circumferential surface of the mounting notch until the flame-protecting block moves to the desired position where the main flame-protecting hole aligns with the upper end of the thermocouple. At this point, the corresponding positioning ball engages in the corresponding positioning groove. This interlocking action between the positioning ball and the positioning groove allows the flame-protecting block to be positioned as needed. Furthermore, when the flame-protecting block rotates to the position where the corresponding group of positioning balls aligns with the positioning groove, the block can be further rotated to align the main flame-protecting hole directly, slightly to the right, or slightly to the left of the upper end of the thermocouple, thereby allowing for better adjustment of the thermocouple's electromotive force.

[0017] The technical solution adopted to further solve the second technical problem mentioned above is: a stove, characterized in that it uses the burner cap structure as described above.

[0018] Compared with the prior art, the advantages of the present invention are as follows: In the present invention, the flame-keeping hole is opened on the flame-keeping block, and the flame-keeping block can move back and forth radially along the inner ring flame cap relative to the installation notch, thereby changing the distance between the gas outlet end of the flame-keeping hole and the thermocouple, thereby changing the temperature at the thermocouple and realizing the adjustment of the electromotive force of the thermocouple to cope with different cooking scenarios (different heat, different pot conditions, etc.), so that the electromotive force of the thermocouple is always kept within a suitable range, avoiding accidental flameout caused by excessively low electromotive force, or affecting the service life of the thermocouple by excessively high electromotive force. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the flame cap structure in an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A structural diagram from another direction;

[0021] Figure 3 This is a cross-sectional view of the flame cap structure in an embodiment of the present invention;

[0022] Figure 4 This is a partial exploded view of the flame cap structure in an embodiment of the present invention;

[0023] Figure 5 This is a partial structural diagram of the flame cap structure in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the fire-preserving block in an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the inner ring fire cap in an embodiment of the present invention. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0028] A stove (specifically a gas stove in this embodiment) includes as follows Figures 1-7 The flame cap structure shown includes an inner ring flame cap 1 with a flame-keeping hole 20 and a thermocouple 3 disposed on the side of the inner ring flame cap 1 and opposite to the flame-keeping hole 20.

[0029] Furthermore, the flame cap structure also includes a flame-holding block 2 with the aforementioned flame-holding hole 20, and the inner ring flame cap 1 has an installation notch 11 on its ring wall that matches the size of the flame-holding block 2 and allows the flame-holding block 2 to be installed. The flame-holding block can move back and forth radially along the inner ring flame cap 1 relative to the aforementioned installation notch 11 to change the distance between the gas outlet end of the flame-holding hole 20 and the thermocouple 3.

[0030] As can be seen from the above, in this invention, the flame-keeping hole 20 is opened on the flame-keeping block 2, and the flame-keeping block 2 can move back and forth radially along the inner ring flame cap 1 relative to the mounting notch 11, thereby changing the distance between the gas outlet end of the flame-keeping hole 20 and the thermocouple 3, thereby changing the temperature at the thermocouple 3, realizing the adjustment of the temperature at the thermocouple 3 to cope with different cooking scenarios (different firepower, different pot conditions, etc.), so that the electromotive force of the thermocouple 3 is always kept in a suitable range, avoiding accidental flameout caused by excessively low electromotive force, or affecting the service life of the thermocouple 3 by excessively high electromotive force.

[0031] Furthermore, the aforementioned flame-keeping holes 20 include at least two flame-keeping holes 20 with different diameters, and the aforementioned flame-keeping block 2 is rotatably installed in the aforementioned mounting notch 11, and can be rotated to align the different flame-keeping holes 20 with the upper end of the aforementioned thermocouple 3. By rotating the flame-keeping block 2 to align the different flame-keeping holes 20 with the upper end of the thermocouple 3, the temperature at the thermocouple 3 can be changed (the larger the flame-keeping hole 20, the greater the airflow, and the higher the combustion temperature; conversely, the smaller the flame-keeping hole 20, the smaller the airflow, and the lower the combustion temperature, etc.), and combined with the movement of the flame-keeping block 2, the temperature at the thermocouple 3 can be better adjusted according to different cooking scenarios, thereby better adjusting the electromotive force of the thermocouple 3.

[0032] Preferably, each of the aforementioned flame-keeping holes 20 includes a main flame-keeping hole 21 and an auxiliary flame-keeping hole 22 with a smaller diameter than the main flame-keeping hole 21. When any flame-keeping hole 20 is opposite to the upper end of the thermocouple 3, the corresponding main flame-keeping hole 21 is opposite to the upper end of the thermocouple 3, while the auxiliary flame-keeping hole 22 is located below the main flame-keeping hole 21. By setting a main flame-keeping hole 21 with a larger diameter and positioning it opposite to the upper end of the thermocouple 3, flame-keeping performance is ensured. By setting the auxiliary flame-keeping hole 22, when the main flame-keeping hole 21 is working normally, the auxiliary flame-keeping hole 22 can stabilize the flame of the main flame-keeping hole 21. Simultaneously, by supplementing sufficient fuel gas, the flame-keeping effect of the main flame-keeping hole 21 is ensured. When the main flame-keeping hole 21 is blocked, the auxiliary flame-keeping hole 22 can heat the thermocouple, ensuring the normal operation of the thermocouple 3, thereby improving the reliability of the inner ring flame cap 1. Further preferably, as... Figure 6 As shown, there are two auxiliary fireproof holes 22 corresponding to each of the main fireproof holes 21, and they are located on both sides of the main fireproof hole 21 (e.g., Figure 4 As shown in the diagram, the channels of each auxiliary flame-keeping hole 22 are inclined from the inside out towards the corresponding main flame-keeping hole 21 relative to the annular wall of the inner ring flame cap 1. By setting two auxiliary flame-keeping holes 22, the flame stabilization effect of the main flame-keeping hole 21 can be better achieved, and the flame-keeping effect of the main flame-keeping hole 21 can also be better guaranteed. Furthermore, when the main flame-keeping hole 21 is blocked, the flames from the auxiliary flame-keeping holes 22 on both sides can converge at the blocked main flame-keeping hole 21, thus better ensuring the normal operation of the thermocouple 3 when the main flame-keeping hole 21 is blocked.

[0033] Specifically, in this embodiment, as Figure 6As shown, there are three flame-protecting holes 20. The main flame-protecting holes 21 of each flame-protecting hole 20 are arranged in an equilateral triangle array, and there are also three auxiliary flame-protecting holes 22 arranged in an equilateral triangle array. Each auxiliary flame-protecting hole 22 is located between two adjacent main flame-protecting holes 21. Furthermore, the flame-protecting block 2 can rotate circumferentially around the center line of the array formed by the main flame-protecting holes 21 of the flame-protecting holes 20. With the above arrangement, it is easier to rotate the flame-protecting block 2 so that different flame-protecting holes 20 are aligned with the upper end of the thermocouple 3. Only three auxiliary flame-protecting holes 22 are needed (if two auxiliary flame-protecting holes 2022 are configured for each main flame-protecting hole 21, then six auxiliary flame-protecting holes 2022 are required). This satisfies the requirement of configuring two auxiliary flame-protecting holes 22 for each main flame-protecting hole 21, making the internal structure of the flame-protecting block 2 simple and facilitating the adjustment of the electromotive force of the thermocouple 3. In this embodiment, the diameters of the three main fire-preserving holes 21 increase sequentially (preferably, in this embodiment, they are in a geometric sequence relationship), while the diameters of the three auxiliary fire-preserving holes 22 are equal.

[0034] Specifically, in this embodiment, as Figure 4 As described above, the flame-holding block 2 is cylindrical in shape and radially arranged along the inner ring flame cap 1. Each main flame-holding hole 21 extends along the axis of the flame-holding block 2 and is arranged around the axis of the flame-holding block 2. Correspondingly, the mounting notch 11 is a circular channel formed on the inner ring flame cap 1, and the flame-holding block 2 can rotate relative to the mounting notch 11 around its own axis and can move back and forth relative to the mounting notch 11 along its own length. Thus, by rotating and moving the flame-holding block 2, the distance between the flame-holding hole 20 and the thermocouple 3 can be adjusted, and the relative positions of different flame-holding holes 20 and the upper ends of the thermocouple 3 can be adjusted. Further, as... Figure 4 and Figure 7 As shown, the outer circumferential surface of the fire-preserving block 2 is provided with an external thread 23, and the wall of the mounting notch 11 is provided with an internal thread 111 that can form a threaded connection with the external thread 23. It also includes a drive mechanism 8 for driving the fire-preserving block 2 to rotate. In this way, when the drive mechanism 8 drives the fire-preserving block 2 to rotate, the fire-preserving block 2 can move along its own length direction at the same time, realizing the rotation and translation of the fire-preserving block 2.

[0035] Furthermore, such as Figure 5 and Figure 7 As shown, the inner edge of the above-mentioned installation notch 11 is provided with flow guiding grooves 12 on both the left and right sides. When each of the above-mentioned flame-preserving holes 20 is opposite to the upper end of the thermocouple 3, each flow guiding groove 12 is located on one side of the corresponding auxiliary flame-preserving hole 22 (e.g., Figure 5(As shown). In the working state, part of the airflow in the inner ring burner cap 1 enters and stagnates in each guide groove 12. When the flame-holding block 2 moves to the required position and the gas in each auxiliary flame-holding hole 22 is burning, a momentary negative pressure is formed at the air inlet end of each auxiliary flame-holding hole 22, driving the airflow stagnating in each guide groove 12 into the corresponding auxiliary flame-holding hole 22, thereby supplementing the combustion gas to each auxiliary flame-holding hole 22, which helps to ensure the combustion of each auxiliary flame-holding hole 22, thereby improving the flame stabilization effect of each auxiliary flame-holding hole 22 on the main flame-holding hole 21. In this embodiment, each flow guide groove 12 is an elongated channel with a closed outer end and an open inner end, and the extension direction of each flow guide groove 12 is parallel to the extension direction of the channel of the corresponding auxiliary flame-preserving hole 22. This allows each flow guide groove 12 to better supplement the corresponding auxiliary flame-preserving hole 22 with gas (i.e., the gas flow in each flow guide groove 12 enters the corresponding auxiliary flame-preserving hole 22 in a downstream manner under the action of instantaneous negative pressure, with little interference to the original gas flow of each auxiliary flame-preserving hole 22).

[0036] In this embodiment, as Figure 2 As shown, the drive mechanism 8 includes a drive motor 81, a first transmission gear (not shown), and a second transmission gear (not shown) meshing with the first transmission gear. The output shaft 811 of the drive motor 81 extends vertically, while a horizontally extending mounting rod 82 is fixed to the rear end of the fire-preserving block 2. The first transmission gear is mounted on the output shaft 811, and the second transmission gear is mounted on the mounting rod 82. Thus, the drive motor 81 drives the first transmission gear to rotate, which in turn drives the mounting rod 82 to rotate, thereby causing the fire-preserving block 2 to rotate, thus realizing the drive mechanism 8's control over the fire-preserving block 2.

[0037] In this embodiment, as Figure 3 As shown, the aforementioned flame cap structure also includes a cylindrical base 4 and an inner ring ejector tube 7 located on one side of the base 4. The base 4 is hollow, forming an open annular groove 40. The inner ring flame cap 1 covers the opening of the annular groove 40, forming an inner ring mixing chamber 5. The air inlet of the inner ring mixing chamber 5 is connected to the inner ring ejector tube 7. The drive motor 81 is located in the central hole 400 of the base 4 and is away from the flame holes of the inner ring flame cap 1 (to avoid the influence of high combustion temperatures on the drive motor 81).

[0038] Furthermore, such as Figure 4 and Figure 7As shown, the outer circumferential surface of the aforementioned fireproof block 2 is provided with circumferentially spaced positioning ball groups 24 corresponding to each fireproof hole 20, and each positioning ball group 24 is provided with retractable positioning balls 241 spaced axially. The number of positioning balls 241 in each positioning ball group 24 is at least equal to the number of fireproof holes 20 and corresponds to each fireproof hole 20. The inner circumferential surface of the aforementioned mounting notch 11 is recessed with positioning grooves 112 for each positioning ball 241 to be inserted into. In this embodiment, specifically, the outer circumferential surface of the fireproof block 2 is recessed with mounting grooves (not shown) corresponding to each positioning ball 241, and each positioning ball 241 is respectively embedded in the corresponding mounting groove. The retraction and extension of each positioning ball 241 are achieved by the compression and rebound of a return spring (not shown). Of course, other existing feasible structures can also be used to achieve the retractable setting of each positioning ball 241.

[0039] In the initial state, one of the aforementioned positioning balls 241 is engaged in the positioning groove 112, while the remaining positioning balls 241 retract and abut against the inner circumferential surface of the mounting notch 11. When the flame-protecting block 2 moves under the drive of the aforementioned drive mechanism 8, the positioning ball 241 moves out of the positioning groove 112 and abuts against the inner circumferential surface of the mounting notch 11, retracting until the flame-protecting block 2 moves to the point where the required main flame-protecting hole 21 is aligned with the upper end of the thermocouple 3. At this point, the corresponding positioning ball 241 engages in the corresponding positioning groove 112. In this way, the flame-protecting block 2 can be positioned in the required position through the snap-fit ​​engagement of the corresponding positioning ball 241 with the positioning groove 112. Furthermore, when the flame-protecting block 2 rotates to the point where the corresponding positioning ball group 24 is aligned with the positioning groove 112, the flame-protecting block 2 can be further rotated so that the main flame hole of the corresponding flame-protecting hole 20 is directly aligned with, slightly to the right of, or slightly to the left of, the upper end of the thermocouple 3. This increases the adjustable range of the electromotive force of the thermocouple 3, allowing the electromotive force of the thermocouple 3 to be adjusted to a suitable value. In this embodiment, specifically, there are three fireproof holes 20, and therefore three sets of positioning ball groups 24 (e.g., Figure 6 As shown), and each set of four position balls 241 (as shown) Figure 4 (As shown).

[0040] Furthermore, suppose the fire-preserving block 2 in this invention has n rotation positions and m translation positions. In this embodiment, n=3 and m=4. Then, the control method of the stove in this invention is as follows:

[0041] When the standard deviation of a consecutive electromotive forces is found to be greater than k, the entry condition is triggered, and the adjustment of the electromotive force of thermocouple 3 is started (by starting the drive motor 81 through the control module). The "i rotation gear - j translation gear" are switched sequentially (i=1……n; j=1……m). Three electromotive forces are recorded continuously at each gear, and the average value is calculated until the magnitude of the electromotive force enters the optimal range.

[0042] In another embodiment, the stove in this invention can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the stove to perform corresponding operations, thereby realizing intelligent control of the stove and improving the user experience.

Claims

1. A flame cap structure, comprising an inner ring flame cap (1) having a flame-holding hole (20) and a thermocouple (3) disposed beside the inner ring flame cap (1) and opposite to the flame-holding hole (20), characterized in that, It also includes a fireproof block (2) with the fireproof hole (20) and the inner ring fire cover (1) has an installation notch (11) on its ring wall that matches the size of the fireproof block (2) and allows the fireproof block (2) to be installed. The fireproof block (2) can move back and forth radially along the inner ring fire cover (1) relative to the installation notch (11) to change the distance between the gas outlet end of the fireproof hole (20) and the thermocouple (3).

2. The flame cap structure as described in claim 1, characterized in that, The fire-preserving hole (20) includes at least two fire-preserving holes (20) with different diameters, and the fire-preserving block (2) is rotatably installed in the mounting notch (11), and can be rotated to make the different fire-preserving holes (20) face the upper end of the thermocouple (3).

3. The flame cap structure as described in claim 2, characterized in that, Each of the aforementioned flame-protecting holes (20) includes a main flame-protecting hole (21) and an auxiliary flame-protecting hole (22) with a diameter smaller than that of the main flame-protecting hole (21). When any flame-protecting hole (20) is opposite to the upper end of the thermocouple (3), the corresponding main flame-protecting hole (21) is opposite to the upper end of the thermocouple (3), and the auxiliary flame-protecting hole (22) is located below the main flame-protecting hole (21).

4. The flame cap structure as described in claim 3, characterized in that, There are two auxiliary fireproof holes (22) corresponding to each of the main fireproof holes (21), and they are located on both sides of the main fireproof hole (21). The channels of each auxiliary fireproof hole (22) are inclined from the inside to the outside towards the corresponding main fireproof hole (21) relative to the inner ring fire cover (1).

5. The flame cap structure as described in claim 4, characterized in that, There are three fireproof holes (20), wherein the main fireproof holes (21) of each fireproof hole (20) are arranged in an equilateral triangle array, and there are three auxiliary fireproof holes (22) also arranged in an equilateral triangle array, and each auxiliary fireproof hole (22) is located between two adjacent main fireproof holes (21). Furthermore, the fireproof block (2) can rotate circumferentially around the center line of the array formed by the main fireproof holes (21) of the fireproof holes (20).

6. The flame cap structure as described in claim 5, characterized in that, The fire-preserving block (2) is cylindrical in shape and is arranged radially along the inner ring fire cover (1). Each main fire-preserving hole (21) extends along the axis of the fire-preserving block (2) and is arranged with the axis of the fire-preserving block (2) as the center. Correspondingly, the mounting notch (11) is a circular channel opened on the inner ring fire cover (1). The fire-preserving block (2) can rotate relative to the mounting notch (11) with its own axis as the center and can move back and forth relative to the mounting notch (11) along its own length direction.

7. The flame cap structure as described in claim 6, characterized in that, The outer peripheral surface of the fireproof block (2) is provided with an external thread (23), and the hole wall of the mounting notch (11) is provided with an internal thread (111) that can form a threaded connection with the external thread (23). It also includes a drive mechanism (8) for driving the fireproof block (2) to rotate.

8. The flame cap structure as described in claim 7, characterized in that, The drive mechanism (8) includes a drive motor (81), a first transmission gear, and a second transmission gear meshing with the first transmission gear. The output shaft (811) of the drive motor (81) extends vertically, and a horizontally extending mounting rod (82) is fixed to the rear end of the fireproof block (2). The first transmission gear is mounted on the output shaft (811), and the second transmission gear is mounted on the mounting rod (82).

9. The flame cap structure as described in claim 7 or 8, characterized in that, The outer circumferential surface of the fireproof block (2) is provided with circumferentially spaced positioning ball groups (24) that correspond one-to-one with each fireproof hole (20). Each positioning ball group (24) is provided with retractable positioning balls (241) spaced axially. The number of positioning balls (241) in the positioning ball group (24) is at least equal to the number of fireproof holes (20) and corresponds one-to-one with each fireproof hole (20). The inner circumferential surface of the mounting notch (11) is provided with positioning grooves (112) for each positioning ball (241) to be inserted. In the initial state, one of the positioning balls (241) is locked in the positioning groove (112), and the remaining positioning balls (241) abut against the inner circumferential surface of the mounting notch (11) and retract. When the fire-preserving block (2) moves under the drive of the driving mechanism (8), the positioning ball (241) moves out of the positioning groove (112) and abuts against the inner circumferential surface of the mounting notch (11) and retracts until the fire-preserving block (2) moves to the position where the required main fire-preserving hole (21) is opposite to the upper end of the thermocouple (3), and the corresponding positioning ball (241) is locked into the corresponding positioning groove (112).

10. A stove, characterized in that, The application has the flame cap structure as described in any one of claims 1 to 9.

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