Burner and hob comprising same

Abstract

The utility model provides a kind of burner and the stove comprising it, the burner includes gas mixing chamber, the gas mixing chamber includes annular inner ring wall surface, the outer ring wall distributed in the outer side of the inner ring wall surface, from the bottom of the inner ring wall surface along the radial direction of the burner extends to the bottom surface of the outer ring wall;The outer ring wall includes head-to-tail connection inner arc wall, outer arc wall and transition wall, the transition wall includes inner side section and outer side section, the inner arc wall extends from its edge to the direction close to the outer side section and forms the inner side section, the inner side section extends from its edge to the direction close to the outer arc wall and forms the outer side section, the interval between the corresponding two outer side sections gradually decreases along the extension direction of the secondary air channel to the direction close to the inner ring wall surface. Under the condition of same inlet area and gas pressure, make secondary air channel more easily roll up air outside burner by Venturi effect, improve the flow efficiency of secondary air.

Description

Technical Field

[0001] This utility model relates to the field of stove technology, and in particular to a burner and a stove containing the burner. Background Technology

[0002] During operation, burners have specific technical requirements regarding their overall height to ensure uniform mixing of fuel gas and primary air, as well as to facilitate the introduction of secondary air for complete combustion. The mixing chamber, as a key cavity for mixing fuel gas and primary air, directly affects the uniformity of the gas mixture.

[0003] When the mixing chamber height is too small, the residence time of the mixed gas within it is shortened, leading to uneven mixing of fuel gas and air. This results in variations in fuel gas concentration at the ignition port, causing uneven flame distribution, inconsistent flame lengths, and even flame lift-off, affecting combustion stability and safety. Conversely, when the mixing chamber height is too low, the inlet area of ​​the secondary air passage is too small, affecting the intake and flow efficiency of secondary air. This leads to insufficient oxygen supply, incomplete combustion, and decreased thermal efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of existing burners, such as low gas flow efficiency, incomplete combustion, flame detachment from the burner holes, and reduced thermal efficiency, and to provide a burner and a stove containing the same.

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

[0006] A burner includes a mixing chamber comprising an annular inner wall, an outer wall distributed outside the inner wall, and extending radially from the bottom of the inner wall to the bottom of the outer wall. The outer wall comprises an inner arc wall, an outer arc wall, and a transition wall connected end-to-end. The inner and outer arc walls face the inner wall and are radially spaced apart. The inner wall, the bottom, the inner arc wall, and the transition wall enclose a secondary air passage for the burner. Two corresponding transition walls and the bottom form the entrance to the secondary air passage. The transition wall comprises an inner section and an outer section. The inner arc wall extends from its edge toward the outer section to form the inner section, and the inner section extends obliquely from its edge toward the outer arc wall to form the outer section. The distance between two corresponding outer sections gradually decreases along the extension direction of the secondary air passage toward the inner wall.

[0007] In this design, the width of the secondary air passage perpendicular to its extension direction follows a Venturi-like structure of "contraction-remaining constant-expansion." Through the Venturi effect, under the same inlet area and gas pressure, the secondary air passage more easily entrains air from outside the burner, ensuring sufficient secondary air is delivered to the burner orifices on the burner cap. This improves the flow efficiency of secondary air at the burner, thereby promoting complete combustion and preventing flame lift-off, thus enhancing thermal efficiency. Furthermore, the aforementioned structural improvements to the secondary air passage do not involve increasing its height. By increasing the secondary air delivery volume without increasing the height of the secondary air passage, a flattened design of the mixing chamber is possible.

[0008] Optionally, the number of outer ring walls is at least two, and the at least two outer ring walls are arranged symmetrically along the radial direction of the burner.

[0009] In this design, at least two inlets are formed by at least two outer ring walls, which helps to replenish secondary air and make combustion more complete.

[0010] Furthermore, the burner also includes an ignition needle and a thermocouple fixed to the bottom surface. The ignition needle is attached to the inner ring wall near the inlet, and the thermocouple is disposed adjacent to the ignition needle.

[0011] In this design, the ignition needle is attached to the inner ring wall near the inlet side to prevent secondary air from entering the gap between the ignition needle and the inner ring wall. This allows air to flow around the sides of the ignition needle, which is beneficial for air circulation and prevents the formation of eddies.

[0012] Optionally, the diameter of the ignition needle is d1, and the distance between the two corresponding inner segments is D1. The diameter d1 of the ignition needle satisfies the following relationship: d1 < D1. The diameter of the inner ring wall is d2, and the diameter d1 of the ignition needle also satisfies the following relationship: d1 < 1 / 3d2.

[0013] In this design, the diameter of the ignition needle satisfies the above relationship, which is conducive to the flow of secondary air, improves combustion efficiency, and avoids local eddies, thus ensuring combustion performance.

[0014] Optionally, the ignition needle and the thermocouple are both located in the region of the bottom surface corresponding to the inner arc wall in the extension direction of the secondary air channel.

[0015] In this design, the width of the corresponding inner arc wall of the secondary air passage gradually increases towards the inner ring wall along the extension direction of the secondary air passage, so that the pressure of the mixture of gas and secondary air is relatively stable, thereby preventing deflagration.

[0016] Optionally, the inner ring wall surface protrudes radially toward the ignition needle to form a partition, and the outer peripheral surface of the ignition needle abuts against the partition.

[0017] In this design, a baffle is used to block the gas flow between the ignition needle and the inner ring wall, thereby preventing the formation of eddies between the ignition needle and the inner ring wall.

[0018] Furthermore, the bottom surface is provided with a first mounting hole and a second mounting hole, and the ignition needle and the thermocouple are respectively inserted through the first mounting hole and the second mounting hole and fixedly connected to the bottom surface.

[0019] In this design, the ignition needle and thermocouple are respectively installed in the first mounting hole and the second mounting hole for easy installation.

[0020] Optionally, the ignition needle extends axially along the inner ring wall, and the diameter d1 of the ignition needle gradually decreases in the direction away from the bottom surface.

[0021] In this design, the diameter of the ignition needle gradually decreases in the direction away from the bottom surface, thereby reducing the resistance generated by the ignition needle to the secondary air.

[0022] A stove, including the burner.

[0023] In this design, the burner, under the same inlet area and gas pressure conditions, makes it easier for the secondary air passage to entrain secondary air, avoid flame lift-off, and improve the ejector effect and thermal efficiency.

[0024] The positive and progressive effects of this utility model are as follows:

[0025] In the burner of this invention, the width of the secondary air passage perpendicular to its extension direction has a Venturi-like structure of "first contracting - remaining constant - then expanding." Through the Venturi effect, under the same inlet area and gas pressure, the secondary air passage more easily entrains air from outside the burner, ensuring sufficient secondary air is delivered to the flame holes on the burner cap. This improves the flow efficiency of secondary air in the burner, thereby ensuring complete combustion and preventing flame lift-off, thus improving thermal efficiency. Furthermore, the above-mentioned structural improvements to the secondary air passage do not involve increasing its height. By increasing the secondary air delivery volume without increasing the height of the secondary air passage, a flattened design of the mixing chamber is possible. Attached Figure Description

[0026] Figure 1 This is a first-view structural schematic diagram of a burner according to an embodiment of the present invention.

[0027] Figure 2This is an exploded view of the burner according to an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the mixing chamber according to an embodiment of the present invention.

[0029] Figure 4 This is a first-view structural schematic diagram of the base according to an embodiment of the present invention.

[0030] Figure 5 This is a second-view structural schematic diagram of a burner according to an embodiment of the present invention.

[0031] Figure 6 for Figure 5 Schematic diagram of the AA-direction isometric section.

[0032] Figure 7 for Figure 5 BB-directed sectional view.

[0033] Figure 8 for Figure 8 Schematic diagram of the isometric cross-section along the CC direction.

[0034] Figure 9 This is a second-view structural schematic diagram of the base according to an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] Base 1

[0037] Inner ring wall 11

[0038] Outer ring wall 12

[0039] Bottom wall 13

[0040] Intake section 131

[0041] Exhaust section 132

[0042] Base cavity 1a

[0043] Inferior chamber 14

[0044] First chamber 141

[0045] Second chamber 142

[0046] Air intake 143

[0047] Upper chamber 15

[0048] Flow booster 16

[0049] Installation Department 17

[0050] Mixing chamber 2

[0051] Inner ring wall 21

[0052] partition 211

[0053] Outer ring wall 22

[0054] Inner arc wall 221

[0055] Outer arc wall 222

[0056] Transition wall 223

[0057] Medial segment 224

[0058] lateral segment 225

[0059] Bottom 23

[0060] First mounting hole 231

[0061] Second mounting hole 232

[0062] Secondary air passage 24

[0063] Entrance 241

[0064] Mating surface 25

[0065] Mixing chamber 26

[0066] Ignition needle 3

[0067] Thermocouple 4 Detailed Implementation

[0068] The present invention will be further illustrated below by way of embodiments, but these embodiments are not intended to limit the scope of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0069] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can mean that two components are internally connected. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0070] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “center,” “top,” “bottom,” “inner,” “outer,” “vertical,” “horizontal,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0071] The terms “first”, “second”, etc., are used merely to distinguish components with similar attributes, not to indicate or imply relative importance or a specific order.

[0072] The terms “including,” “comprising,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0073] See Figure 1 and Figure 2 This utility model provides a stove, which includes a burner comprising a base 1, a mixing chamber 2, and a flame cap (not shown in the figure) stacked from bottom to top. The base 1 has a base cavity 1a, and the mixing chamber 2 and the flame cap form a mixing chamber 26 of the burner. The base cavity 1a and the mixing chamber 26 are vertically connected. The bottom side of the base 1 has an air inlet 143 corresponding to an ejector tube (e.g., ...). Figure 4 As shown), the mixing chamber 2 is provided with a secondary air channel 24. The gas in the gas pipeline enters the base cavity 1a through the injection tube from the air inlet 143. The gas flows upward in the base cavity 1a, flows through the mixing chamber 26, and flows out from the flame hole of the burner to achieve combustion. The air outside the burner is supplemented to the flame hole through the secondary air channel 24 to achieve the purpose of complete combustion.

[0074] See Figure 3The mixing chamber 2 includes an annular inner ring wall 21, an outer ring wall 22 distributed outside the inner ring wall 21, and a bottom surface 23 of the outer ring wall 22 extending radially from the bottom of the inner ring wall 21 to the bottom surface 23 of the burner. Specifically, the outer ring wall 22 includes an inner arc wall 221, an outer arc wall 222, and a transition wall 223 connected end to end. The inner arc wall 221 and the outer arc wall 222 face the inner ring wall 21 and are arranged radially spaced along the inner ring wall 21. The inner arc wall 221, outer arc wall 222, transition wall 223 and burner cap form the mixing chamber 26. The inner ring wall surface 21, bottom surface 23, inner arc wall 221 and transition wall 223 enclose the secondary air passage 24 of the burner. The distance between the two corresponding transition walls 223 forms the inlet 241 of the secondary air passage 24. The combustion gas in the base cavity 1a flows out from the burner hole of the burner cap through the mixing chamber 26 and enters the secondary air passage 24 to achieve complete combustion.

[0075] In one embodiment, the transition wall 223 includes an inner section 224 and an outer section 225. The inner arc wall 221 extends from its edge toward the outer section 225 to form the inner section 224, and the inner section 224 extends obliquely from its edge toward the outer arc wall 222 to form the outer section 225. The spacing between the two corresponding outer sections 225 gradually decreases along the extension direction of the secondary air channel 24 toward the inner ring wall 21. In this embodiment, the secondary air channel 24 includes a contraction section, a mixing section, and a diffusion section arranged sequentially along the extension direction of the secondary air channel 24. The two corresponding outer sidewalls 225 form the contraction section, and the outer sidewalls 225 are inclined relative to the inner sidewalls, so that the width of the contraction section gradually decreases towards the inner ring wall. The two corresponding inner sidewalls 224 form the mixing section, and the width of the mixing section remains unchanged. The two corresponding inner arc walls 221 form the diffusion section, and the width of the diffusion section gradually increases along the extension direction of the secondary air channel towards the inner ring wall 21. This makes the width of the secondary air channel 24 perpendicular to its extension direction have a Venturi-like structure of "first contraction - remain unchanged - then expansion". Through the Venturi effect, under the same inlet 241 area and gas pressure, the secondary air channel can more easily entrain air from outside the burner, ensuring sufficient secondary air is delivered to the burner holes on the burner cap, improving the flow efficiency of secondary air at the burner, thereby improving thermal efficiency by ensuring complete combustion of the flame and preventing flame lift-off from the burner holes. In addition, the above-mentioned structural improvement of the secondary air channel 24 does not involve increasing the height of the secondary air channel 24. By increasing the secondary air delivery volume without increasing the height of the secondary air channel 24, it is beneficial to achieve a flattened design for the mixing chamber 2.

[0076] In some embodiments, the number of outer ring walls 22 is at least two, and the corresponding two transition walls 223 of the at least two outer ring walls 22 respectively form the aforementioned inlet 241 with the bottom surface 23. The formation of at least two corresponding inlets 241 by the at least two outer ring walls 22 facilitates the replenishment of secondary air, resulting in more complete combustion. It should be noted that this invention does not limit the number of outer ring walls 22. Figure 3 As shown, there are two outer ring walls 22, symmetrically arranged, so that the two secondary air channels 24 formed are also symmetrically arranged. In other embodiments, the number of outer ring walls 22 may be one, three, or more, so that the number of secondary air channels 24 formed is also only one, or three or more. Wherein, when there are three or more secondary air channels 24 formed, these secondary air channels 24 are preferably circumferentially evenly distributed on the burner to ensure that the amount of secondary air on each side of the burner is relatively uniform.

[0077] See Figure 1 and Figure 2 The burner also includes an ignition needle 3 and a thermocouple 4. The ignition needle 3 is used to cooperate with the inner ring burner cap to achieve ignition, while the thermocouple 4 is used to detect flame problems so that in the event of accidental flame extinguishing, the gas valve can be shut off to prevent the continued supply of gas to the burner. The ignition needle 3 and thermocouple 4 are fixed to the bottom surface 23 of the mixing chamber 2. Specifically, the bottom surface 23 of the mixing chamber 2 has a first mounting hole 231 and a second mounting hole 232. The ignition needle 3 and thermocouple 4 pass through the first mounting hole 231 and the second mounting hole 232 respectively and are fixedly connected to the bottom surface 23. In one embodiment, the base 1 is provided with a mounting part 17 (such as...). Figure 3 As shown), the first mounting hole 231 corresponds to the through hole of the mounting part 17. The ignition needle 3 passes through the through hole and the first mounting hole 231 of the mounting part 17 in sequence, and is fixedly connected to the mounting part 17 by means of snap-fit ​​or interference fit, which facilitates installation.

[0078] In one embodiment, the ignition needle 3 is fitted against the side of the inner ring wall 21 near the inlet 241 to prevent secondary air from entering the gap between the ignition needle 3 and the inner ring wall 21. This allows the secondary air entering the secondary air channel 24 from the inlet 241 to flow around both sides of the ignition needle 3, facilitating airflow and preventing eddy currents. Optionally, the inner ring wall 21 protrudes radially towards the ignition needle 3 to form a baffle 211 (e.g., Figure 3 As shown), the outer peripheral surface of the ignition needle 3 abuts against the partition 211. The partition 211 blocks the gas flow between the ignition needle 3 and the inner ring wall 11, thereby preventing secondary air from forming a vortex between the ignition needle 3 and the inner ring wall 11.

[0079] Optionally, the ignition needle 3 extends axially along the inner ring wall 21, and the diameter d1 of the ignition needle 3 gradually decreases in the direction away from the bottom surface 23, reducing the resistance of the ignition needle 3 to secondary air. The ignition needle 3 can be made of ceramic. Since a glaze is formed on the surface of the ignition needle 3, the resistance of secondary air flowing into the surface of the ignition needle 3 is reduced, further preventing the formation of eddies.

[0080] In one embodiment, the ignition needle 3 and the thermocouple 4 are both located in the area corresponding to the inner arc wall 221 on the bottom surface 23 in the extension direction of the secondary air channel 24, and are far away from the transition wall 223. The width of the corresponding inner arc wall 221 of the secondary air channel 24 (i.e. the width perpendicular to the extension direction of the secondary air channel 24) gradually increases along the extension direction of the secondary air channel 24 towards the inner ring wall 21, so that the pressure of the mixture of gas and secondary air in this area is relatively stable, thereby preventing deflagration.

[0081] Furthermore, the diameter of the ignition needle 3 is d1, and the distance between the two corresponding inner sections 224 (i.e., the width of the mixing section of the secondary air channel 24) is D1. The diameter d1 of the ignition needle 3 satisfies the following relationship: d1 < D1. Furthermore, the diameter of the inner ring wall 21 is d2, and the diameter d1 of the ignition needle 3 also satisfies the following relationship: d1 < 1 / 3d2. This facilitates the flow of secondary air, improves combustion efficiency, and avoids local eddies, ensuring combustion performance.

[0082] See Figure 7 and Figure 9 In some embodiments, the base 1 includes an inner ring wall 11, an outer ring wall 12 surrounding the inner ring wall 11, and a bottom wall 13 connecting the inner ring wall 11 and the outer ring wall 12. The outer ring wall 12, the inner ring wall 11, and the bottom wall 13 enclose an annular base cavity 1a. Figure 2 and Figure 6 As shown, the mixing chamber 2 is mounted on top of the base 1, and both the inner ring wall surface 11 and the outer ring wall surface 12 are mating surfaces 25 of the mixing chamber 2 (e.g., ...). Figure 6 As shown, the outer ring wall 12, inner ring wall 11, bottom wall 13 and mating surface 25 abut against each other to form the above-mentioned base cavity 1a.

[0083] In some embodiments, a flow-boosting portion 16 protrudes from the lower side of the outer ring wall 12, and the flow-boosting portion 16 extends axially along the outer ring wall 12 to the bottom wall 13. Specifically, the flow-boosting portion 16 can be fixedly attached to the outer ring wall 12 by means of welding, riveting, or fastener connection, or it can be integrally formed with the base 1, such as... Figure 9 As shown, the outer ring wall 12 protrudes radially to form a flow booster 16. This utility model does not limit the connection method between the flow booster 16 and the outer ring wall 12.

[0084] Furthermore, such as Figure 9 As shown, in the height direction, the base cavity 1a includes a lower chamber 14 corresponding to the flow booster 16 and an upper chamber 15 located above the lower chamber 14. The projected area of ​​the lower chamber 14 along the axial direction of the outer ring wall 12 is S1, while the projected area of ​​the upper chamber 15 along the axial direction of the outer ring wall 12 is S2. Because the flow booster 16 reduces the projected area of ​​the lower chamber 14, S1 < S2. During burner operation, the combustion gas from the injector enters the lower chamber 14 from the inlet 143. By reducing the flow cross-sectional area (i.e., projected area S1) of the lower chamber 14 through the flow booster 16, the combustion gas velocity in the lower chamber 14 is increased, thereby preventing backfire and suppressing detonation. Since the projected area S2 of the upper chamber 15 is larger than the projected area S1 of the lower chamber 14, the gas flow rate entering the upper chamber 15 is reduced, the gas pressure is relatively stable, and the gas and air are mixed more evenly. This avoids incomplete combustion caused by excessively high or low local gas concentration, prevents local deflagration or flame detachment of the mixture at the burner orifice, and thus improves the thermal efficiency of the burner.

[0085] In one embodiment, the outer annular wall 12 is provided with multiple relatively independent flow-enhancing sections 16 to collectively reduce the flow cross-sectional area of ​​the lower chamber 14, making the flow cross-sectional area of ​​the lower chamber 14 smaller than that of the upper chamber 15. These flow-enhancing sections 16 can be arranged circumferentially on the inner side of the outer annular wall 12 and symmetrically arranged radially along the outer annular wall 12. This symmetrical arrangement of the flow-enhancing sections avoids localized concentration of gas and improves the uniformity of gas within the base cavity. Figure 3 In the embodiment shown, the number of flow boosting sections 16 is specifically three, and these three flow boosting sections 16 are evenly distributed along the circumference of the outer ring wall 12.

[0086] See Figure 9 In some embodiments, the axial height of the upper chamber 15 along the outer ring wall 12 is h1, and the average axial height of the lower chamber 14 along the outer ring wall 12 is h2, satisfying the following relationship: 5mm ≤ h1 < h2. During the flow of gas from the upper chamber 15 into the mixing chamber 26, it is necessary to ensure the structural compatibility between the base 1 and the mixing chamber 2. Since the radial diameter of the outer ring wall 12 along the burner is relatively fixed due to the burner structure, if the height of the upper chamber 15 is too small, its internal volume will be insufficient, affecting the injection effect and leading to incomplete combustion or unstable flame. Conversely, if the height of the upper chamber 15 is too large, the gas residence time in the upper chamber 15 will be prolonged, resulting in local gas mixture accumulation, which can easily cause detonation during ignition due to excessive instantaneous combustion energy release. The base 1 of this invention, with 5mm ≤ h1 < h2, provides sufficient gas buffer space for the upper chamber 15, ensuring the injection effect while making the gas output more stable, thus suppressing detonation.

[0087] In one embodiment, the ratio of the projected area S2 of the upper chamber 15 to the projected area S1 of the lower chamber 14 is within the range of 1.5 to 2. Further, the volume V1 of the upper chamber 15 and the volume V2 of the lower chamber 14 satisfy the following relationship: V1 ≤ 1 / 2V2. When the gas flows through the lower chamber 14, which has a smaller projected area and a larger volume, the gas flow velocity increases, thereby preventing backfire and improving the ejection effect. When the gas enters the upper chamber 15, which has a larger projected area and a smaller volume, the gas flow velocity decreases and the static pressure increases, achieving a uniform distribution of gas pressure and avoiding detonation caused by sudden changes in gas flow velocity.

[0088] See Figure 5 , Figure 7 and Figure 8 In one embodiment, the lower chamber 14 includes a first chamber 141 and a second chamber 142 that are connected to each other. The first chamber 141 is located on the side of the inner ring wall 11 near the air inlet 143, and the second chamber 142 is located on the side of the inner ring wall 11 away from the air inlet 143. The bottom wall 13 is inclined relative to the outer ring wall 12. The bottom wall 13 includes an air inlet section 131 corresponding to the first chamber 141 and an air outlet section 132 corresponding to the second chamber 142. The angle between the air inlet section 131 and the outer ring wall 12 is smaller than the angle between the air outlet section 132 and the inner ring wall 11. The smaller angle between the air inlet section 131 and the outer ring wall 12 results in a relatively small projected area of ​​the first chamber 141 along the axial direction of the outer ring wall, which increases the gas flow rate, prevents backfire, and enhances the entrainment of primary air, thereby improving combustion efficiency. The large angle between the outlet section 132 and the inner ring wall 11 makes the area of ​​the bottom wall 13 corresponding to the outlet section 132 more gentle. The gas pressure in this area is relatively stable, which is conducive to the uniform mixing of gas and air, thereby preventing knocking and improving combustion stability.

[0089] Furthermore, combined Figure 4 The total area of ​​the air inlet 143 is S3, and satisfies the following relationship: S3≥1 / 4 S1, which ensures that the gas maintains a stable and continuous flow state during the process of entering the first chamber 141, thereby improving the ejection performance.

[0090] Combination Figure 9 and Figure 6 In one embodiment, the inner ring wall 11 of the base 1 is provided with a mounting portion 17, which extends axially along the inner ring wall 11 to the bottom wall 13 of the base 1. The projection of the mounting portion 17 along the axial direction of the inner ring wall 11 is circular or arc-shaped towards the inner ring wall 11. The mounting portion 17 has a through hole along its axial direction for the ignition needle 3 to pass through. During installation, the ignition needle 3 passes through the through hole and the first mounting hole 231 sequentially from the bottom of the burner, and is fixedly connected to the mounting portion 17 by means of snap-fit ​​or interference fit.

[0091] Furthermore, the mounting part 17 is located in the area of ​​the inner ring wall 11 corresponding to the air inlet 143 and far away from the air inlet end (not shown in the figure). The minimum distance between the mounting part 17 and the outer ring wall 12 is L1, and the minimum distance between the outer ring wall 12 and the inner ring wall 11 is L2, and the following relationship is satisfied: L1≤1 / 2L2. The mounting part 17 plays a turbulence role, changing the flow path of the gas around the inner ring wall 11, so as to balance the gas flow velocity on the opposite sides of the inner ring wall 21 near the mounting part 17 and away from the mounting part 17, thereby improving the circumferential uniformity of gas flow in the base cavity 1a, improving the mixing uniformity of gas and primary air, and preventing detonation.

[0092] The cooktop containing the burner 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 cooktop to perform corresponding operations, thereby realizing intelligent control of the cooktop and improving the user experience.

[0093] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model 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 this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A burner comprising a mixing chamber, characterized in that, The mixing chamber includes an annular inner ring wall, an outer ring wall distributed outside the inner ring wall, and extends radially from the bottom of the inner ring wall to the bottom of the outer ring wall. The outer ring wall includes an inner arc wall, an outer arc wall, and a transition wall connected end to end. The inner arc wall and the outer arc wall face the inner ring wall surface and are arranged radially spaced along the inner ring wall surface. The inner ring wall surface, the bottom surface, the inner arc wall, and the transition wall enclose and form the secondary air passage of the burner. The two corresponding transition walls and the bottom surface form the inlet of the secondary air passage. The transition wall includes an inner section and an outer section. The inner arc wall extends from its edge toward the outer section to form the inner section. The inner section extends obliquely from its edge toward the outer arc wall to form the outer section. The spacing between the two corresponding outer sections gradually decreases along the extension direction of the secondary air channel toward the inner ring wall.

2. The burner as claimed in claim 1, characterized in that, The number of outer ring walls is at least two, and the at least two outer ring walls are arranged symmetrically along the radial direction of the burner.

3. The burner as described in claim 1, characterized in that, The burner also includes an ignition needle and a thermocouple fixed to the bottom surface. The ignition needle is attached to the inner ring wall near the inlet, and the thermocouple is disposed adjacent to the ignition needle.

4. The burner as described in claim 3, characterized in that, The diameter of the ignition needle is d1, and the distance between the two inner segments is D1. The diameter d1 of the ignition needle satisfies the following relationship: d1 < D1.

5. The burner as described in claim 4, characterized in that, The diameter of the inner ring wall is d2, and the diameter of the ignition needle d1 also satisfies the following relationship: d1 < 1 / 3d2.

6. The burner as claimed in claim 3, characterized in that, The ignition needle and the thermocouple are both located on the bottom surface in the region corresponding to the inner arc wall in the extension direction of the secondary air channel.

7. The burner as claimed in claim 3, characterized in that, The inner ring wall surface protrudes radially toward the ignition needle to form a partition, and the outer peripheral surface of the ignition needle abuts against the partition.

8. The burner as claimed in claim 3, characterized in that, The bottom surface has a first mounting hole and a second mounting hole. The ignition needle and the thermocouple are respectively inserted through the first mounting hole and the second mounting hole and are fixedly connected to the bottom surface.

9. The burner as claimed in claim 8, characterized in that, The ignition needle extends axially along the inner ring wall, and the diameter d1 of the ignition needle gradually decreases in the direction away from the bottom surface.

10. A stove, characterized in that, Includes the burner according to any one of claims 1-9.

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