Inner fire cover and burner having the same

Abstract

The present invention discloses an inner fire cover and a burner thereof. The inner fire cover has an inner ring air cavity and an annular air cavity. The annular air cavity is located radially inward or radially outward of the inner ring air cavity. An ignition hole group is provided on the cavity wall of the inner ring air cavity near the annular air cavity. The annular air cavity is connected to the inner ring air cavity through the ignition hole group. An inner ring fire hole group is provided at a position corresponding to the inner ring air cavity on the top of the inner fire cover. The inner ring fire hole group is connected to the inner ring air cavity. An air hole group is provided at a position corresponding to the annular air cavity on the top of the inner fire cover. The air hole group is connected to the annular air cavity. The inner fire cover of the present invention has a simple structure, which not only ensures sufficient combustion and effectively improves thermal efficiency, but also realizes hiding the ignition hole group and the ignition induction needle inside the inner fire cover, thereby improving the reliability of ignition and induction.

Description

Technical Field

[0001] The present invention relates to the technical field of gas stoves, and in particular to an inner fire cover and a burner having the same. Background Art

[0002] The three-ring fire of the three-ring fire burner on the market is often arranged on three fire covers or two fire covers. If it is arranged on three fire covers, the burner structure will be relatively complex and the size will be larger; if the three-ring fire is arranged on two fire covers, then one of the fire covers will need to be arranged with two ring fires. If two ring fires are arranged on an inner fire cover, the inner ring fire usually burns poorly because it has no separate secondary air supply channel.

[0003] Existing fire covers are usually made of copper. The copper surface is easy to drill round holes, but not easy to drill special-shaped holes. In situations where there are special requirements for through-hole rate and hole shape, the processing efficiency of copper fire covers is low, it is not convenient for large-scale processing, and it cannot meet the various required hole shapes.

[0004] The ignition sensing pin of a gas stove is usually placed on the outside of the inner fire cover, which can not only ignite but also sense the flame at the lowest fire. However, the exposed ignition pin usually makes the burner difficult to clean. If food or spilled liquid during cooking covers it, it will also affect ignition and sensing, thereby affecting the user experience. Summary of the Invention

[0005] The present invention aims to solve, at least to a certain extent, one of the problems existing in the existing related technologies. To this end, the present invention proposes an inner fire cover with a simple structure, which not only ensures sufficient combustion and effectively improves thermal efficiency, but also realizes the concealment of the ignition hole group and the ignition sensing needle inside the inner fire cover, thereby improving the reliability of ignition and sensing.

[0006] The present invention also provides a burner with an inner fire cover.

[0007] According to the above-mentioned inner fire cover, it is realized by the following technical solutions:

[0008] An inner fire cover, the inner fire cover having an inner ring air cavity and an air cavity, the air cavity being located radially inward or radially outward of the inner ring air cavity, an ignition hole group being provided on the cavity wall of the inner ring air cavity close to the air cavity, the air cavity being connected to the inner ring air cavity through the ignition hole group, an inner ring fire hole group being provided at a position corresponding to the inner ring air cavity on the top of the inner fire cover, the inner ring fire hole group being connected to the inner ring air cavity, an air hole group being provided at a position corresponding to the air cavity on the top of the inner fire cover, the air hole group being connected to the air cavity.

[0009] In some embodiments, an inner bevel is provided on the radial inner side of the top upper surface of the inner fire cover, and the inner bevel is arranged from the top center point of the inner fire cover to the radial outer side and tilted downward, and the inner ring fire hole group and the air hole group are both provided on the inner bevel.

[0010] In some embodiments, the air hole group includes a plurality of secondary air holes arranged at intervals; the inner ring fire hole group includes a plurality of inner ring straight fire holes arranged at intervals, and the horizontal cross-sectional area of the inner ring straight fire holes is smaller than the horizontal cross-sectional area of the secondary air holes.

[0011] In some embodiments, the secondary air hole is any one of a circular hole, an oblong hole, a polygonal hole, an arched hole, a snowflake hole, a star-shaped hole, a heart-shaped hole, or a pear-shaped hole.

[0012] In some embodiments, an opening is provided at a position on the top of the inner fire cover corresponding to the air cavity, and the opening is located directly above the gas outlet direction of the ignition hole group.

[0013] In some embodiments, an air intake hole group and an ignition needle mounting hole are provided at a position on the bottom of the inner fire cover corresponding to the air cavity, and the ignition needle mounting hole and the air intake hole group are respectively connected to the air cavity; or, a plurality of bottom air vents arranged circumferentially at a position on the bottom of the inner fire cover corresponding to the inner ring air cavity are provided, and each of the bottom air vents is connected to the inner ring air cavity.

[0014] In some embodiments, the inner fire cover is an integrated structure; or the inner fire cover includes a fire cover body and a cover plate, the fire cover body has an inner ring air cavity with a top opening, an air cavity with a top opening and the ignition hole group, the cover plate covers the inner ring air cavity and the top opening of the air cavity, and the inner ring fire hole group and the air hole group are provided on the cover plate.

[0015] In some embodiments, the inner fire cover also has a middle ring air cavity, which is located outside the air cavity and the inner ring air cavity. A middle ring fire hole group is provided on the radial outside of the outer wall or top of the inner fire cover, and the middle ring fire hole group is connected to the middle ring air cavity.

[0016] In some embodiments, the middle ring fire hole group includes at least one circle of middle fire hole groups, and each circle of the middle fire hole group includes a plurality of middle ring straight fire holes arranged at intervals along the circumferential direction of the inner fire cover.

[0017] In some embodiments, a fire transfer groove arranged in a radial direction is provided on the top of the inner fire cover, the radial inner end of the fire transfer groove is close to or connected to the inner ring fire hole group or the air hole group arranged adjacent thereto, and the radial outer end of the fire transfer groove is connected to the middle ring fire hole group.

[0018] According to the burner provided above, it is realized by the following technical solution:

[0019] The burner includes an ignition sensing needle and an inner ignition cover as described above. The ignition sensing needle is installed in the air cavity, and the gas outlet direction of the ignition hole group is toward the ignition sensing needle.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] 1. The inner fire cover of the present invention provides an air cavity radially inward or radially outward of the inner ring air cavity, and provides an ignition hole group communicating with the air cavity in the cavity wall of the inner ring air cavity. This allows the ignition hole group to be hidden inside the inner fire cover. This not only ensures better windproofing of the flame of the ignition hole group, improves the ignition success rate and flame sensing reliability, but also makes the inner fire cover more concise in appearance.

[0022] 2. By arranging the air hole group and the inner ring fire hole group on the top of the inner fire cover respectively, the air hole group is connected to the air cavity and is located radially inward or radially outward of the inner ring fire hole group, so that secondary air is added to the inner ring fire flame, the gas is fully burned, CO emissions are reduced, and thermal efficiency is effectively improved;

[0023] 3. By installing the ignition sensing needle in the air cavity and below the top cavity surface of the air cavity, the air outlet direction of the ignition hole group is toward the ignition sensing needle, so that the ignition sensing needle is hidden in the air cavity of the inner fire cover, making the induction flame more resistant to crosswinds, improving the reliability of ignition and induction, and ensuring a simpler appearance of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of the inner ignition cover and the ignition sensor needle in Example 1 of the present invention;

[0025] Figure 2 This is a schematic structural diagram of the inner fire cover in Example 1 of the present invention;

[0026] Figure 3 is a cross-sectional view of another inner fire cover in Example 1 of the present invention;

[0027] Figure 4 is a cross-sectional view of the inner fire cover in Example 2 of the present invention;

[0028] Figure 5 is a cross-sectional view of the inner fire cover in Example 3 of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the inner fire cover in Example 3 of the present invention. Figure 1 ;

[0030] Figure 7 This is a schematic diagram of the structure of the inner fire cover in Example 3 of the present invention. Figure 2 ;

[0031] Figure 8 is a cross-sectional view of the inner ignition cover and the ignition sensor needle in Example 4 of the present invention;

[0032] Figure 9 This is a schematic diagram of the structure of the inner fire cover in Example 4 of the present invention. Figure 1 ;

[0033] Figure 10 This is a schematic diagram of the structure of the inner fire cover in Example 4 of the present invention. Figure 2 .

[0034] In the figure: 1-inner fire cover, 101-fire cover body, 1011-annular protrusion, 1012-annular avoidance hole, 12-cover plate, 11-inner ring air cavity, 110-inner ring straight fire hole, 111-ignition hole, 112-bottom vent hole, 12-air cavity, 120-secondary air hole, 121-opening, 122-ignition needle mounting hole, 123-bottom air hole, 13-middle ring air cavity, 130-middle ring main fire hole, 141-top center point, 142-inner bevel, 143-outer plane, 15-fire transfer groove; 2-ignition sensor needle. DETAILED DESCRIPTION

[0035] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0036] Example 1

[0037] refer to Figure 1-2 The present embodiment provides an inner fire cover, which is an integral structure and is cast in one piece from copper. The inner fire cover 1 has an inner ring air cavity 11 opening downward and an air cavity 12 opening downward, and the air cavity 12 is located radially inward of the inner ring air cavity 11. An ignition hole group is provided on the cavity wall of the inner ring air cavity 11 close to the air cavity 12, that is, an ignition hole group is provided on the inner ring wall of the inner ring air cavity 11, and the air cavity 12 is connected to the inner ring air cavity 11 through the ignition hole group. In this way, the ignition hole group is located on the inner side of the inner ring air cavity 11 and is hidden inside the inner fire cover 1, ensuring that the flame windproof effect of the ignition hole group is better, improving the ignition success rate and flame sensing reliability, and making the appearance of the inner fire cover and the entire burner simpler. In this embodiment, the air cavity 12 not only serves as a secondary air supply channel, but also serves as a flame protection space for the ignition hole group and an installation space for the ignition sensing needle 2. When the ignition sensing needle 2 is installed in the air cavity 12 and located in the air outlet direction of the ignition hole group, the flame sensing of the ignition sensing needle 2 is more stable and reliable.

[0038] An inner ring fire hole group is provided at the top of the inner fire cover, corresponding to the inner ring air cavity 11. The inner ring fire hole group is connected to the inner ring air cavity 11, and the gas ignites and burns at the inner ring fire hole group to form the inner ring fire. An air hole group is provided at the top of the inner fire cover, corresponding to the air cavity 12. The air hole group is connected to the air cavity 12. In this way, secondary air is added to the inner ring fire flame through the connected air cavity 12 and the air hole group, ensuring sufficient combustion of the gas, reducing CO emissions and improving thermal efficiency.

[0039] refer to Figure 1-2 In this embodiment, the top surface of the inner fire cover is horizontal. The air hole group is located at the center of the inner fire cover, directly above the air cavity 12. The inner ring fire hole group is located at the top of the inner fire cover, peripherally surrounding the air hole group. When secondary air is ejected upward from the air cavity 12 and the air hole group, it provides the radially inner side of the inner ring fire with the necessary secondary air for combustion, ensuring more complete combustion of the inner ring fire and preventing excessive heat at the center of the bottom of the cookware, which can easily cause the pot to burn.

[0040] refer to Figure 3 In other embodiments, the radial inner side of the top upper surface of the inner fire cover can be designed as an inner bevel 142, and the inner bevel 142 is arranged radially outward and inclined downward from the top center point 141 of the inner fire cover; the radial outer side of the top upper surface of the inner fire cover is designed as an outer plane 143, and the outer plane 143 is set at an obtuse angle to the inner bevel 142. The inner ring fire hole group and the air hole group are both set on the inner bevel 142. Therefore, the inner bevel 142 can serve as a drainage surface. When the gas stove overflows during cooking, the inner bevel 142 can drain the overflow to the outer plane 143, reducing the overflow from being discharged from the air hole group and / or the inner ring fire hole group; the inner bevel 142 can also direct part of the inner ring fire power to the top center point 141, so that the bottom of the pot is heated evenly.

[0041] refer to Figure 1-2 The inner ring fire hole group includes at least one circle of inner fire hole groups, and each circle of inner fire hole groups includes a plurality of inner ring straight fire holes 110 spaced apart along the circumferential direction of the inner fire cover. When the gas ignites and burns at the inner ring straight fire holes 110, an inner ring straight jet fire is formed, thereby evenly heating the bottom of the pot during cooking. In this embodiment, the inner ring fire hole group includes three circles of inner fire hole groups, which are spaced apart along the radial direction on the top of the inner fire cover 1. Each circle of inner fire hole groups includes a plurality of inner ring straight fire holes 110 spaced apart along the circumferential direction of the inner fire cover 1. In this way, the firepower range of the inner ring fire is increased, and the inner ring direct jet fire allows the bottom center of the pot to be evenly heated, providing a good cooking experience.

[0042] refer to Figure 1-2The air hole group includes multiple secondary air holes 120 arranged at intervals. All secondary air holes 120 are distributed throughout the center of the top of the inner fire cover 1. The horizontal cross-sectional area of each secondary air hole 120 is larger than that of the inner ring direct fire hole 110, ensuring that the inner fire cover 1 has a larger secondary air ventilation area, thereby supplementing the secondary air required for combustion of the inner ring fire or inner ring direct jet fire, ensuring more complete combustion of the inner ring fire.

[0043] In this embodiment, since the inner fire cover 1 is an integrated structure, the secondary air hole 120 is designed to be a circular hole to ensure the drilling success rate and reduce the defective product rate of the inner fire cover 1.

[0044] refer to Figure 1-2 In this embodiment, three groups of ignition hole groups are provided at circumferential intervals on the inner cavity wall of the inner ring air cavity 11. Of course, the number of ignition hole groups can also be designed to be five groups. Each group of ignition hole groups includes two or three ignition holes 111 arranged at intervals in the upper and lower directions to increase the ignition area, which is conducive to further improving the ignition success rate and the reliability of fire transmission. The three groups of ignition hole groups are arranged in a clockwise order, and the outlet direction of the middle group (i.e., the second group) of ignition hole groups is designed to be toward the ignition sensing needle 2 to ensure that the ignition and flame induction of the ignition sensing needle 2 are more reliable. When the gas ejected from the middle group of ignition hole groups is ignited, the gas ejected from the ignition hole groups on the left and right sides can be quickly ignited, which effectively increases the range of the ignition flame area, ensures that the ignition flame is less likely to be blown out, and improves the reliability of ignition and fire transmission. At least one secondary air hole 120 is designed to be located directly above or near the gas outlet direction of the second group of ignition holes. In this way, after the gas is ejected from the second group of ignition holes and ignited, this part of the flame can directly transmit the fire upward through the secondary air hole 120 located directly above or near the second group of ignition holes, thereby quickly igniting the gas arranged near it and ejected upward from the inner ring fire hole group.

[0045] The gas outlet direction of the first ignition hole group is designed to be located directly below one of the secondary air holes 120. Similarly, the gas outlet direction of the third ignition hole group is designed to be located directly below another secondary air hole 120. Thus, by designing the gas outlet direction of some ignition hole groups to be located directly below some secondary air holes 120, when the gas ignites and burns at the ignition holes 111 of this part of the ignition hole group, this part of the flame can directly transmit fire upward through the secondary air holes 120 located above it, thereby quickly igniting the gas ejected upward from the inner ring fire hole group. It can be seen that the secondary air holes 120 located directly above the gas outlet direction of the ignition hole group are both the secondary air supplement channel during normal combustion and the fire transmission channel when the burner ignites and burns, which is conducive to increasing the fire transmission area and further improving the fire transmission reliability.

[0046] refer to Figure 1-3The inner fire cover 1 also has a middle ring air cavity 13, which is located outside the air cavity 12 and the inner ring air cavity 11. A middle ring fire hole group is provided on the radially outer side of the outer wall or top of the inner fire cover 1, and the middle ring fire hole group is connected to the middle ring air cavity 13. Thus, through the cooperation of the middle ring fire hole group connected to the middle ring air cavity 13 and the inner ring fire hole group connected to the inner ring air cavity 11, the inner fire cover 1 has two rings of fire, namely, an inner ring fire and a middle ring fire.

[0047] In this embodiment, the inner ring air cavity 11 is located between the middle ring air cavity 13 and the air cavity 12, and the middle ring fire hole group is provided on the outer wall of the inner fire cover 1. The middle ring fire hole group includes at least one ring of middle fire hole groups, which includes a plurality of middle ring primary fire holes 130 spaced apart along the circumference of the inner fire cover. The diameter of each middle ring primary fire hole 130 is smaller than the diameter of the secondary air holes 120 in the air hole group.

[0048] In order to facilitate the rapid transfer of the inner ring fire to the middle fire hole group, a fire transfer groove (not shown in the figure) arranged in the radial direction can be added to the top of the inner fire cover. The radial inner end of the fire transfer groove is connected to the inner ring fire hole group arranged close to it, and the radial outer end of the fire transfer groove 15 is connected to the middle ring fire hole group.

[0049] refer to Figure 1 or Figure 3 This embodiment further provides a burner, which includes an ignition sensing needle 2 and the inner ignition cover 1 as described above. The ignition sensing needle 2 is installed in the air cavity 12, and the air outlet direction of the ignition hole group is toward the ignition sensing needle 2. Therefore, by installing the ignition sensing needle 2 in the air cavity 12 and below the top cavity wall of the air cavity 12, and arranging the ignition hole group on the inner side of the inner ring air cavity 11 with its air outlet direction toward the ignition sensing needle 2, it is achieved that both the ignition hole group and the ignition sensing needle 2 are hidden in the inner ignition cover 1. This not only makes the induced flame more resistant to crosswinds and improves the reliability of ignition and induction, but also makes the burner more concise in appearance.

[0050] Example 2

[0051] refer to Figure 4 This embodiment differs from the first embodiment in that the air cavity 12 and the inner ring cavity 11 are interchanged in position. In this embodiment, the air cavity 12 is located radially outward of the inner ring cavity 11, so that the air cavity 12 is located between the inner ring cavity 11 and the middle ring cavity 13. Correspondingly, the air hole group is located outside the inner ring fire hole group and communicates with the air cavity 12. The inner ring fire hole group is located at the top center of the inner fire cover 1 and communicates with the inner ring cavity 11.

[0052] Therefore, by designing the air cavity 12 to be located between the inner ring air cavity 11 and the middle ring air cavity 13, it is effectively ensured that there is a separate secondary air supply channel between the inner ring fire and the middle ring fire, so that the secondary air is better replenished for the radial outside of the inner ring fire and the radial inside of the middle ring fire, so that the gas can burn fully on the inner fire cover 1, and the inner fire cover is equipped with more heat loads to reduce CO emissions and increase heat exchange efficiency.

[0053] Example 3

[0054] refer to Figure 5-7 The difference between this embodiment and embodiment 1 is that the inner fire cover 1 is a split structure, which includes a fire cover body 101 and a cover plate 102, wherein the fire cover body 101 has an inner ring air cavity 11 with a top opening, an air cavity 12 with a top opening, an ignition hole group and a middle ring air cavity 13 with a downward opening, and the inner ring air cavity 11 is located between the air cavity 12 and the middle ring air cavity 13. The cover plate 102 covers the top openings of the inner ring air cavity 11 and the air cavity 12 and is fixedly connected or detachably connected to the fire cover body 101, and an inner ring fire hole group and an air hole group are provided on the cover plate 102. The ignition sensor needle is installed in the air cavity 12 and is located below the cover plate 102. In this embodiment, the fire cover body 101 is formed by integrally processing copper material, and the cover plate 102 is formed by integrally processing sheet metal material.

[0055] Therefore, by designing the inner fire cover 1 as a split structure and arranging the inner ring fire hole group and the air hole group on the cover plate 102, while ensuring the yield, the required various hole shapes can be stamped out more quickly, better meeting the occasions with high requirements for through-hole rate and / or special requirements for hole shape.

[0056] refer to Figure 5-6 In this embodiment, the inner ring straight fire holes 110 in the inner ring fire hole group are circular holes, and the secondary air holes 120 in the air hole group are polygonal holes. In other embodiments, the secondary air holes 120 can also be designed as other special-shaped holes, such as oblong holes, arched holes, snowflake holes, star holes, heart holes, or pear holes. The oblong holes can be elliptical holes or waist-shaped holes.

[0057] An opening 121 is provided at the top of the inner fire cover 1 (i.e., the cover plate 102) at a position corresponding to the air cavity 12. Opening 121 is located directly above the ignition hole group in the direction of gas outlet. In this embodiment, opening 121 serves as a flame transmission channel and a secondary air supply channel. Opening 121 is formed by interconnecting two, three, or more adjacent secondary air holes 120 located directly above the ignition hole group in the direction of gas outlet. This increases the unit flame transmission channel area, facilitating the rapid upward transmission of the ignition flame at the ignition hole group through opening 121 and igniting the gas ejected upward from the inner ring fire hole group.

[0058] An annular protrusion 1011 extending upward and located on the periphery of the cover plate 102 is integrally formed on the top of the fire cover body 101. The annular protrusion 1011 is assembled and fixed to the cover plate 102 by screw riveting, so that the cover plate 102 is firmly and reliably connected to the fire cover body 101. An annular avoidance hole 1012 is provided on the radial inner side of the annular protrusion 1011, which opens toward the cover plate 102. The annular avoidance hole 1012 reduces the radial thickness of the lower end of the annular protrusion 1011, making it easier to screw rivet the annular protrusion 1011 to the cover plate 102.

[0059] refer to Figure 5-6 A radially extending flame transfer groove 15 is provided at the top of the fire cover body 101 and extends through the annular protrusion 1011. The radially inner end of the flame transfer groove 15 is positioned adjacent to the inner ring fire hole group. Alternatively, the radially inner end of the flame transfer groove 15 can be connected to the inner ring fire hole group, while the radially outer end of the flame transfer groove 15 is connected to the middle ring fire hole group. Thus, the flame from the inner ring fire hole group is rapidly transferred to the middle ring fire hole group through the flame transfer groove 15, thereby igniting the gas ejected from the middle ring fire hole group to form a middle ring fire.

[0060] refer to Figure 7 A plurality of bottom air vents 112 are arranged at circumferentially uniform intervals at the position of the inner ring air cavity 11 at the bottom of the fire cover body 101, and each bottom air vent 112 is connected to the inner ring air cavity 11. In this way, the inner ring gas can be further premixed and evenly flowed into the inner ring air cavity 11 at the bottom of the fire cover body 101 through the plurality of bottom air vents 112 evenly distributed circumferentially, thereby achieving the effect of gas separation and gas equalization.

[0061] Example 4

[0062] refer to Figure 8-10 The difference between this embodiment and embodiment 3 is that the setting positions of the air cavity 12 and the inner ring cavity 11 are interchanged. In this embodiment, the air cavity 12 is located radially outside the inner ring cavity 11, so that the air cavity 12 is located between the inner ring cavity 11 and the middle ring cavity 13. Correspondingly, the air hole group is located on the periphery of the inner ring fire hole group and is connected to the air cavity 12, and the inner ring fire hole group is set at the top center of the inner fire cover 1 and is connected to the inner ring cavity 11. In this way, a separate secondary air supply channel is ensured between the inner ring fire and the middle ring fire, which better replenishes secondary air for the radial outside of the inner ring fire and the radial inside of the middle ring fire, so that the gas burns fully on the inner fire cover 1, and the inner fire cover is equipped with more heat loads to reduce CO emissions and increase heat exchange efficiency.

[0063] In this embodiment, the inner ring straight fire holes 110 in the inner ring fire hole group are circular holes, and the secondary air holes 120 in the air hole group are oblong holes. The oblong holes are elliptical in shape, and their lengths are arranged radially, so that the radial inner sides of the secondary air holes 120 are closer to the inner ring fire hole group, and the radial outer ends are closer to the middle ring fire hole group, effectively increasing the radial secondary air replenishment width of the secondary air holes 120. In addition, the radial inner ends of the fire transfer grooves 15 are arranged close to the air hole group arranged adjacent to them. Of course, the radial inner ends of the fire transfer grooves 15 can also be designed to pass through the radial outer sides of the cover plate 102 until the radial inner ends of the fire transfer grooves 15 are close to or connected to the inner ring fire hole group.

[0064] refer to Figure 10 At the bottom of the fire cap body 101, corresponding to the air cavity 12, are located an air intake hole group and an ignition needle mounting hole 122. The ignition needle mounting hole 122 is waist-shaped and connects to the air cavity 12, allowing the ignition sensor needle 2 to pass through. The air intake hole group includes multiple bottom air distribution holes 123 spaced circumferentially. Each bottom air distribution hole 123 connects to the air cavity 12, allowing secondary air to pass through. This circumferential distribution of the multiple bottom air distribution holes 123 ensures a more even flow of secondary air into the air cavity 12, achieving an air distribution effect.

[0065] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A burner comprising an ignition sensing needle (2), characterized in that: The invention also includes an inner fire cover, wherein the inner fire cover has an inner ring air cavity (11) and an air cavity (12), wherein the air cavity (12) is located radially inward or radially outward of the inner ring air cavity (11), and an ignition hole group is provided on the cavity wall of the inner ring air cavity (11) close to the air cavity (12), and the air cavity (12) is connected to the inner ring air cavity (11) through the ignition hole group, and an inner ring fire hole group is provided at a position corresponding to the inner ring air cavity (11) on the top of the inner fire cover, and the inner ring fire hole group is connected to the inner ring air cavity (11), and an air hole group is provided at a position corresponding to the air cavity (12) on the top of the inner fire cover, and the air hole group is connected to the air cavity (12), and the inner fire cover has an inner ring fire hole group. An inner bevel (142) is provided on the radial inner side of the top upper surface, and the inner bevel (142) is arranged from the top center point (141) of the inner fire cover to the radial outer side and tilted downward, and the inner ring fire hole group and the air hole group are both arranged on the inner bevel (142), and the inner fire cover also has a middle ring air cavity (13), and the middle ring air cavity (13) is located outside the air cavity (12) and the inner ring air cavity (11), and a middle ring fire hole group is provided on the outer side wall or the radial outer side of the top of the inner fire cover, and the middle ring fire hole group is connected to the middle ring air cavity (13), and the ignition sensing needle (2) is installed in the air cavity (12), and the air outlet direction of the ignition hole group is toward the ignition sensing needle (2).

2. A burner according to claim 1, characterized in that: The air hole group comprises a plurality of secondary air holes (120) arranged at intervals; the inner ring fire hole group comprises a plurality of inner ring straight fire holes (110) arranged at intervals, and the horizontal cross-sectional area of the inner ring straight fire holes (110) is smaller than the horizontal cross-sectional area of the secondary air holes (120).

3. A burner according to claim 2, characterized in that: The secondary air hole (120) is any one of a circular hole, an oblong hole, a polygonal hole, an arched hole, a snowflake hole, a star-shaped hole, a heart-shaped hole, or a pear-shaped hole.

4. A burner according to claim 1, characterized in that: An opening (121) is provided at a position on the top of the inner fire cover corresponding to the air cavity (12), and the opening (121) is located directly above the gas outlet direction of the ignition hole group.

5. The burner according to claim 1, characterized in that: An air intake hole group and an ignition needle mounting hole (122) are provided at a position on the bottom of the inner fire cover corresponding to the air cavity (12), and the ignition needle mounting hole (122) and the air intake hole group are respectively connected to the air cavity (12); or, a plurality of bottom air vents (112) arranged circumferentially at intervals are provided at a position on the bottom of the inner fire cover corresponding to the inner ring air cavity (11), and each of the bottom air vents (112) is connected to the inner ring air cavity (11).

6. A burner according to claim 1 or 5, characterized in that: The inner fire cover is an integrated structure; or the inner fire cover includes a fire cover body (101) and a cover plate (102), wherein the fire cover body (101) has an inner ring air cavity (11) with a top opening, an air cavity (12) with a top opening, and the ignition hole group, and the cover plate (102) covers the inner ring air cavity (11) and the top opening of the air cavity (12), and the inner ring fire hole group and the air hole group are provided on the cover plate (102).

7. A burner according to claim 6, characterized in that: The middle ring fire hole group comprises at least one circle of middle fire hole groups, and each circle of the middle fire hole group comprises a plurality of middle ring straight fire holes (130) arranged at intervals along the circumferential direction of the inner fire cover.

8. A burner according to claim 6, characterized in that: A fire transmission groove (15) arranged in a radial direction is provided on the top of the inner fire cover, the radial inner end of the fire transmission groove (15) is close to or connected to the inner ring fire hole group or the air hole group arranged adjacent thereto, and the radial outer end of the fire transmission groove (15) is connected to the middle ring fire hole group.

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