CN219674219U - Inner fire cover and burner thereof - Google Patents

Abstract

The utility model discloses an inner fire cover and a burner thereof, wherein the inner fire cover is provided with an inner ring air cavity and an annular air cavity, the annular air cavity is positioned at the radial inner side or the radial outer side of the inner ring air cavity, an ignition hole group is arranged on the cavity wall of the inner ring air cavity, which is close to the annular air cavity, the annular air cavity is communicated with the inner ring air cavity through the ignition hole group, an inner ring fire hole group is arranged at the position of the top of the inner fire cover, which corresponds to the inner ring air cavity, the inner ring fire hole group is communicated with the inner ring air cavity, and an air hole group is arranged at the position of the top of the inner fire cover, which corresponds to the annular air cavity, and the air hole group is communicated with the annular air cavity. The inner fire cover disclosed by the utility model has a simple structure, ensures sufficient combustion, effectively improves the thermal efficiency, and realizes that the ignition hole group and the ignition induction needle are hidden in the inner fire cover, so that the reliability of ignition and induction is improved.

Description

Inner fire cover and burner thereof

Technical Field

The utility model relates to the technical field of gas stoves, in particular to an inner fire cover and a burner thereof.

Background

The three-ring fire of the three-ring fire burner in the market is often distributed on three fire covers or two fire covers, and if the three fire covers are distributed, the burner has a relatively complex structure and a larger size; if the three-ring fire is arranged on the two fire covers, two-ring fire needs to be arranged on one fire cover, and if the two-ring fire is arranged on one inner fire cover, the inner ring fire is usually not combusted well because no separate secondary air supplementing channel exists.

The existing fire cover is mainly made of copper, round holes are conveniently drilled on the surface of the copper, special-shaped holes are inconvenient to drill, and in the occasion with special requirements on the hole rate and the shape of the holes, the machining efficiency of the copper fire cover is low, the copper fire cover is inconvenient to machine in batches, and various required hole shapes cannot be met.

The ignition induction needle of gas-cooker is arranged in the outside of interior fire lid usually, can ignite, also can sense the flame when minimum fire, but the ignition needle that exposes makes the combustor difficult clean usually, and food or overflow cover on it when cooking still can influence ignition and response to influence user's use experience.

Disclosure of Invention

The utility model aims to solve one of the problems existing in the related art to at least a certain extent, and therefore, the utility model provides the inner fire cover which is simple in structure, ensures sufficient combustion, effectively improves the heat efficiency, and achieves the purposes of hiding the ignition hole group and the ignition induction needle in the inner fire cover and improving the reliability of ignition and induction.

The utility model also provides a burner with the inner fire cover.

According to the inner fire cover provided by the utility model, the inner fire cover is realized by the following technical scheme:

the inner fire cover is provided with an inner ring air cavity and an annular air cavity, the annular air cavity is positioned at the radial inner side or the radial outer side of the inner ring air cavity, an ignition hole group is arranged on the cavity wall, close to the annular air cavity, of the inner ring air cavity, the annular air cavity is communicated with the inner ring air cavity through the ignition hole group, an inner ring fire hole group is arranged at the position, corresponding to the inner ring air cavity, of the top of the inner fire cover, the inner ring fire hole group is communicated with the inner ring air cavity, an air hole group is arranged at the position, corresponding to the annular air cavity, of the top of the inner fire cover, and the air hole group is communicated with the annular air cavity.

In some embodiments, an inner inclined surface is arranged radially inside the top upper surface of the inner fire cover, the inner inclined surface is arranged from the top center point of the inner fire cover to the radial outer side and is inclined downwards, and the inner fire hole group and the air hole group are both arranged on the inner inclined surface.

In some embodiments, the air hole set includes a plurality of secondary air holes arranged at intervals; the inner ring fire hole group comprises a plurality of inner ring straight fire holes which are arranged at intervals, and the horizontal sectional area of the inner ring straight fire holes is smaller than that of the secondary air holes.

In some embodiments, the secondary air holes are any of circular holes, oblong holes, polygonal holes, arched holes, snowflake holes, star-shaped holes, heart-shaped holes, or pear-shaped holes.

In some embodiments, an opening is provided at a position of the top of the inner fire cover corresponding to the annular air cavity, and the opening is located right above the air outlet direction of the ignition hole group.

In some embodiments, an air inlet hole group and an ignition needle mounting hole are arranged at the bottom of the inner fire cover at the position corresponding to the annular air cavity, and the ignition needle mounting hole and the air inlet hole are respectively communicated with the annular air cavity; or a plurality of bottom vent holes which are circumferentially arranged at intervals are arranged at the position of the bottom of the inner fire cover corresponding to the inner ring air cavity, and each bottom vent hole is communicated with the inner ring air cavity.

In some embodiments, the inner fire cover is a unitary structure; or the inner fire cover comprises a fire cover body and a cover plate, wherein the fire cover body is provided with an inner ring air cavity with an opening at the top, an annular air cavity with an opening at the top and an ignition hole group, the cover plate covers the openings at the top of the inner ring air cavity and the annular air cavity, and the cover plate is provided with the inner ring fire hole group and the air hole group.

In some embodiments, the inner fire cover further has an intermediate ring air cavity, the intermediate ring air cavity is located at the periphery of the annular air cavity and the inner ring air cavity, and an intermediate ring fire hole set is arranged on the outer side wall or the radial outer side of the top of the inner fire cover and is communicated with the intermediate ring air cavity.

In some embodiments, the set of middle fire holes comprises at least one ring of middle fire holes, each ring of middle fire holes comprising a plurality of middle straight fire holes arranged at intervals along the circumferential direction of the inner fire cover.

In some embodiments, a fire transfer groove is arranged at the top of the inner fire cover along the radial direction, the radial inner end of the fire transfer groove is close to or communicated with the inner ring fire hole group or the air hole group arranged close to the fire transfer groove, and the radial outer end of the fire transfer groove is communicated with the middle ring fire hole group.

According to the burner provided by the utility model, the burner is realized by the following technical scheme:

the burner comprises an ignition induction needle and the inner fire cover, wherein the ignition induction needle is installed in the annular air cavity, and the air outlet direction of the ignition hole group faces to the ignition induction needle.

Compared with the prior art, the utility model at least comprises the following beneficial effects:

1. according to the inner fire cover, the annular air cavity is arranged on the radial inner side or the radial outer side of the inner annular air cavity, and the ignition hole group communicated with the annular air cavity is arranged on the cavity wall of the inner annular air cavity, so that the ignition hole group is hidden in the inner fire cover, the flame windproof effect of the ignition hole group is better, the ignition success rate and the flame induction reliability are improved, and the appearance of the inner fire cover is simpler;

2. the air hole group and the inner ring fire hole group are respectively arranged at the top of the inner fire cover, the air hole group is communicated with the annular air cavity and is positioned at the radial inner side or the radial outer side of the inner ring fire hole group, so that secondary air is supplemented to inner ring fire flames, the fuel gas is combusted fully, the CO emission is reduced, and the thermal efficiency is effectively improved;

3. through installing the ignition response needle in annular air intracavity and being located annular air intracavity's top cavity face below, the direction of giving vent to anger of ignition hole group is towards the ignition response needle, has realized hiding the ignition response needle in annular air intracavity of interior fire lid for the anti crosswind performance of response flame is better, improves the reliability of ignition and response, guarantees that the combustor outward appearance is succinct.

Drawings

FIG. 1 is a cross-sectional view of an inner fire cover and ignition sense needle in example 1 of the present utility model;

FIG. 2 is a schematic view showing the structure of an inner fire cover in embodiment 1 of the present utility model;

FIG. 3 is a cross-sectional view of another inner fire cover in example 1 of the present utility model;

FIG. 4 is a cross-sectional view of the inner fire cover in example 2 of the present utility model;

FIG. 5 is a cross-sectional view of the inner fire cover in example 3 of the present utility model;

FIG. 6 is a schematic view showing the structure of an inner fire cover in embodiment 3 of the present utility model;

FIG. 7 is a schematic diagram showing the structure of an inner fire cover in embodiment 3 of the present utility model;

FIG. 8 is a cross-sectional view of the inner fire cover and ignition sense needle of example 4 of the present utility model;

FIG. 9 is a schematic view showing the structure of an inner fire cover in embodiment 4 of the present utility model;

fig. 10 is a schematic diagram showing a second structure of the inner fire cover in embodiment 4 of the present utility model.

In the figure: 1-an inner fire cover, 101-a fire cover body, 1011-annular protrusions, 1012-annular avoidance holes, 12-cover plates, 11-inner annular air cavities, 110-inner annular straight fire holes, 111-ignition holes, 112-bottom vent holes, 12-annular air cavities, 120-secondary air holes, 121-open holes, 122-ignition needle mounting holes, 123-bottom air equalizing holes, 13-middle annular air cavities, 130-middle annular main fire holes, 141-top center points, 142-inner inclined surfaces, 143-outer planes and 15-fire transfer grooves; 2-ignition sense needle.

Detailed Description

The following examples illustrate the utility model, but the utility model is not limited to these examples. Modifications and equivalents of some of the technical features of the specific embodiments of the present utility model may be made without departing from the spirit of the present utility model, and they are all included in the scope of the claimed utility model.

Example 1

Referring to fig. 1-2, the present embodiment provides an inner fire cover 1 of an integral structure, which is integrally cast from copper. The inner fire cover 1 has an inner annular air chamber 11 opening downward and an annular air chamber 12 opening downward, the annular air chamber 12 being located radially inward of the inner annular air chamber 11. The inner ring air cavity 11 is close to the cavity wall of the annular air cavity 12 and is provided with an ignition hole group, namely, the inner ring wall of the inner ring air cavity 11 is provided with the ignition hole group, and the annular air cavity 12 is communicated with the inner ring air cavity 11 through the ignition hole group, so that the ignition hole group is positioned at the inner side of the inner ring air cavity 11 and is hidden in the inner fire cover 1, the flame windproof effect of the ignition hole group is better, the ignition success rate and the flame induction reliability are improved, and meanwhile, the appearance of the inner fire cover and the whole combustor is more concise. In this embodiment, the annular air chamber 12 not only serves as a secondary air supplementing channel, but also serves as a flame protecting space of the ignition hole group and an installation space of the ignition sense needle 2, and when the ignition sense needle 2 is installed in the annular air chamber 12 and located in the air outlet direction of the ignition hole group, the flame sensing of the ignition sense needle 2 is more stable and reliable.

An inner ring fire hole group is arranged at the position of the top of the inner fire cover corresponding to the inner ring air cavity 11, the inner ring fire hole group is communicated with the inner ring air cavity 11, and fuel gas ignites and burns at the inner ring fire hole group to form inner ring fire. The air hole group is arranged at the position of the top of the inner flame cover corresponding to the annular air cavity 12 and is communicated with the annular air cavity 12, so that secondary air is supplemented for the inner annular flame through the communicated annular air cavity 12 and the air hole group, the combustion of fuel gas is sufficient, the emission of CO is reduced, and the thermal efficiency is improved.

Referring to fig. 1-2, in this embodiment, the top upper surface of the inner fire cover is a horizontal plane, the air hole group is disposed at the center of the top of the inner fire cover and directly above the annular air chamber 12, and the inner annular fire hole group is disposed at the top of the inner fire cover and is located at the periphery of the air hole group. When secondary air is sprayed upwards from the annular air cavity 12 and the air hole group in sequence, the secondary air required by combustion is provided for the radial inner side of the inner ring fire, so that the inner ring fire is ensured to burn more fully, and meanwhile, the phenomenon that the pot is burnt easily due to overlarge firepower at the central position of the bottom of the pot can be avoided.

Referring to fig. 3, in other embodiments, the radially inner side of the top upper surface of the inner fire cover may be designed as an inner bevel 142, the inner bevel 142 being arranged obliquely radially outward and downward from the top center point 141 of the inner fire cover; the radially outer side of the top upper surface of the inner fire cover is designed as an outer plane 143, and the outer plane 143 and the inner inclined plane 142 are arranged at an obtuse angle. The inner ring fire hole set and the air hole set are both disposed on the inner inclined surface 142. Thus, the inner inclined surface 142 can be used as a drainage surface, when the gas stove cooks in a scene of overflow, the inner inclined surface 142 can drain the overflow to the outer plane 143, and the overflow is reduced from being discharged from the air hole group and/or the inner ring fire hole group; the inner inclined surface 142 can also guide part of inner ring fire power to the center point 141 of the top, so that the bottom of the cooker is heated uniformly.

Referring to fig. 1-2, the inner ring fire hole group includes at least one ring of inner fire hole groups, each ring of inner fire hole groups includes a plurality of inner ring straight fire holes 110 arranged at intervals along a circumferential direction of the inner fire cover, and when fuel gas is ignited and burned at the inner ring straight fire holes 110, an inner ring straight fire is formed, so that the bottom of the pot is heated uniformly during cooking. In this embodiment, the inner ring fire hole group includes three rings of inner fire hole groups, and the three rings of inner fire hole groups are arranged at the top of the inner fire cover 1 along the radial direction at intervals, and each ring of inner fire hole group includes a plurality of inner ring straight fire holes 110 arranged along the circumferential direction of the inner fire cover 1 at intervals, so that the range of the firepower area of the inner ring fire is enlarged, and the inner ring straight fire makes the center of the bottom of the pot be heated uniformly, and the cooking experience is good.

Referring to fig. 1-2, the air hole group includes a plurality of secondary air holes 120 arranged at intervals, and all the secondary air holes 120 are distributed at the top center position of the inner fire cover 1. The horizontal sectional area of each secondary air hole 120 is larger than the horizontal sectional area of the inner ring straight fire hole 110 to ensure that the inner fire cover 1 has a larger secondary air ventilation area, thereby realizing secondary air required for the supplementary combustion of the inner ring fire or the inner ring straight fire and enabling the combustion of the inner ring fire to be more sufficient.

In the present embodiment, since the inner fire cover 1 is of an integral structure, the secondary air holes 120 are designed as circular holes to ensure the success rate of drilling and reduce the defective yield of the inner fire cover 1.

Referring to fig. 1-2, in the present embodiment, three sets of ignition hole sets are circumferentially spaced apart from the inner cavity wall of the inner annular air cavity 11, and of course, the number of the ignition hole sets may be designed to be five. Each ignition hole group comprises two or three ignition holes 111 which are arranged at intervals up and down, so that the ignition area is increased, and the ignition success rate and the fire transmission reliability are further improved. The three ignition hole groups are ordered clockwise, and the air outlet direction of the middle ignition hole group (namely the second group) is designed to face the ignition induction needle 2, so that the ignition and flame induction of the ignition induction needle 2 are ensured to be more reliable, after the fuel gas sprayed from the middle ignition hole group is ignited, the fuel gas sprayed from the ignition hole groups on the left side and the right side of the ignition hole group can be rapidly ignited, the ignition flame area range is effectively enlarged, the ignition flame is ensured to be more difficult to blow out, and the ignition and flame transmission reliability is improved. At least one secondary air hole 120 is designed to be located directly above or near the direction of the gas outlet of the second ignition hole group, so that after the gas is ejected from the second ignition hole group and ignited, the part of flame can directly pass upwards through the secondary air hole 120 located directly above or near the second ignition hole group, and the gas which is arranged near the secondary air hole and ejected upwards from the inner ring fire hole group can be quickly ignited.

The direction of the gas outlet of the first ignition hole group is designed to be located directly under one of the secondary air holes 120, and the direction of the gas outlet of the third ignition hole group is designed to be located directly under the other secondary air hole 120, so that when the gas is ignited and combusted at the ignition holes 111 of the part of the ignition hole group, the part of flame can directly pass upwards through the secondary air hole 120 located above the part of flame, and the gas sprayed upwards from the inner ring fire hole group can be quickly ignited. It can be seen that the secondary air hole 120 located right above the air outlet direction of the ignition hole set is not only a secondary air supplementing channel during normal combustion, but also a fire transferring channel during ignition combustion of the burner, which is beneficial to increasing the fire transferring area and further improving the fire transferring reliability.

Referring to fig. 1-3, the inner fire cover 1 further has an intermediate ring air cavity 13, the intermediate ring air cavity 13 is located at the periphery of the annular air cavity 12 and the inner ring air cavity 11, and an intermediate ring hole group is arranged on the outer side wall or the top radial outer side of the inner fire cover 1 and is communicated with the intermediate ring air cavity 13. It can be seen that the inner fire cover 1 has two ring fires, namely an inner ring fire and an intermediate ring fire, by matching the set of middle ring fire holes communicated with the middle ring air cavity 13 and the set of inner ring fire holes communicated with the inner ring air cavity 11.

In this embodiment, the inner ring air chamber 11 is located between the middle ring air chamber 13 and the ring air chamber 12, and the middle ring fire hole group is provided on the outer side wall of the inner fire cover 1. The middle fire hole group includes at least one ring of middle fire hole group including a plurality of middle main fire holes 130 arranged at intervals in the circumferential direction of the inner fire cover, and each middle main fire hole 130 has a diameter smaller than that of the secondary air holes 120 in the air hole group.

In order to facilitate rapid transfer of the inner annular fire to the middle fire hole group, a fire transfer groove (not shown in the figure) arranged along the radial direction may be additionally arranged at the top of the inner fire cover, the radial inner end of the fire transfer groove is communicated with the inner annular fire hole group arranged close to the fire transfer groove, and the radial outer end of the fire transfer groove 15 is communicated with the middle fire hole group.

Referring to fig. 1 or 3, the present embodiment also provides a burner comprising an ignition sense needle 2 and an inner fire cover 1 as described above, the ignition sense needle 2 being mounted in an annular air chamber 12, the air outlet direction of the ignition hole group being directed towards the ignition sense needle 2. Therefore, the ignition induction needle 2 is arranged in the annular air cavity 12 and is positioned below the top cavity wall of the annular air cavity 12, the ignition hole group is arranged on the inner side of the inner annular air cavity 11, the air outlet direction of the ignition hole group faces to the ignition induction needle 2, both the ignition hole group and the ignition induction needle 2 are hidden in the inner fire cover 1, firstly, the induction flame side wind resistance performance is better, the ignition and induction reliability is improved, and secondly, the appearance of the burner is more concise.

Example 2

Referring to fig. 4, this embodiment is different from embodiment 1 in that the arrangement positions of the annular air chamber 12 and the inner annular air chamber 11 are interchanged, and in this embodiment, the annular air chamber 12 is located radially outside the inner annular air chamber 11 so that the annular air chamber 12 is located between the inner annular air chamber 11 and the middle annular air chamber 13. Correspondingly, the air hole group is positioned at the periphery of the inner ring fire hole group and communicated with the annular air cavity 12, and the inner ring fire hole group is arranged at the center of the top of the inner fire cover 1 and communicated with the inner ring air cavity 11.

Therefore, by designing the annular air cavity 12 to be positioned between the inner annular air cavity 11 and the middle annular air cavity 13, an independent secondary air supply channel is effectively ensured between the inner annular fire and the middle annular fire, and secondary air is better supplemented for the radial outer side of the inner annular fire and the radial inner side of the middle annular fire, so that fuel gas is fully combusted on the inner fire cover 1, and the inner fire cover is distributed with more heat load to ensure that CO emission is low and heat exchange efficiency is high.

Example 3

Referring to fig. 5 to 7, this embodiment is different from embodiment 1 in that the inner fire cover 1 is a split structure including a fire cover body 101 and a cover plate 102, wherein the fire cover body 101 has an inner annular air chamber 11 open at the top, an annular air chamber 12 open at the top, an ignition hole group, and an intermediate annular air chamber 13 open downward, the inner annular air chamber 11 being located between the annular air chamber 12 and the intermediate annular air chamber 13. The cover plate 102 covers the top openings of the inner ring air cavity 11 and the annular air cavity 12 and is fixedly connected or detachably connected with the fire cover body 101, and an inner ring fire hole group and an air hole group are arranged on the cover plate 102. The ignition sense pin is mounted within the annular air chamber 12 and below the cover plate 102. In this embodiment, the fire cover body 101 is integrally formed of copper, and the cover plate 102 is integrally formed of sheet metal.

Therefore, the inner fire cover 1 is designed into a split structure, and the inner ring fire hole group and the air hole group are arranged on the cover plate 102, so that various hole shapes required by punching can be realized faster while the yield is ensured, and occasions with higher requirements on the through hole rate or/and special requirements on the hole shapes are better met.

Referring to fig. 5-6, in the present 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 may also be designed as other shaped holes, such as any of oblong holes, arched holes, snowflake holes, star-shaped holes, heart-shaped holes, or pear-shaped holes, wherein the oblong holes are oval holes or kidney-shaped holes.

An opening 121 is arranged at the top of the inner fire cover 1 (namely the cover plate 102) corresponding to the annular air cavity 12, and the opening 121 is positioned right above the air outlet direction of the ignition hole group. In this embodiment, the opening 121 is used as a fire transfer channel and a secondary air supplementing channel, and the opening 121 is formed by two, three or more secondary air holes 120 which are located right above the air outlet direction of the ignition hole group and are adjacent to each other and are designed to be communicated, so that the unit fire transfer channel area is advantageously increased, and the ignition flame at the ignition hole group can be conveniently and rapidly transferred upwards through the opening 121 and ignite the fuel gas sprayed upwards from the inner ring fire hole group.

An annular protrusion 1011 extending upwards and positioned at the periphery of the cover plate 102 is integrally formed at the top of the fire cover body 101, and the cover plate 102 is fixed by assembling the annular protrusion 1011 through spin riveting, so that the cover plate 102 is firmly and reliably connected to the fire cover body 101. The annular avoidance hole 1012 which is opened towards the cover plate 102 is formed in the radial inner side surface of the annular protrusion 1011, and the thickness of the lower end of the annular protrusion 1011 in the radial direction is reduced through the annular avoidance hole 1012, so that the annular protrusion 1011 can be more conveniently riveted and fixed with the cover plate 102.

Referring to fig. 5 to 6, a fire transfer groove 15 which is arranged along the radial direction and penetrates through the annular protrusion 1011 is arranged at the top of the fire cover body 101, and the radial inner end of the fire transfer groove 15 is closely arranged with an inner ring fire hole group which is arranged close to the fire transfer groove 15, of course, the radial inner end of the fire transfer groove 15 can also be designed to be communicated with the inner ring fire hole group; the radially outer end of the fire transfer groove 15 communicates with the set of pilot holes. Thus, through the fire transfer groove 15, the flames at the inner ring fire hole group are quickly transferred to the middle ring fire hole group, so that the fuel gas sprayed from the middle ring fire hole group is ignited to form middle ring fire.

Referring to fig. 7, a plurality of bottom vent holes 112 are arranged at positions of the bottom of the fire cover body 101 corresponding to the inner ring air cavity 11 at uniform intervals in the circumferential direction, and each bottom vent hole 112 is communicated with the inner ring air cavity 11, so that the inner ring fuel gas can be further premixed uniformly at the bottom of the fire cover body 101 and uniformly flows into the inner ring air cavity 11 through the plurality of bottom vent holes 112 uniformly distributed in the circumferential direction, and the effects of gas distribution and gas uniformity are achieved.

Example 4

Referring to fig. 8 to 10, this embodiment is different from embodiment 3 in that the arrangement positions of the annular air chamber 12 and the inner annular air chamber 11 are interchanged, and in this embodiment, the annular air chamber 12 is located radially outside the inner annular air chamber 11 so that the annular air chamber 12 is located between the inner annular air chamber 11 and the middle annular air chamber 13. Correspondingly, the air hole group is positioned at the periphery of the inner ring fire hole group and communicated with the annular air cavity 12, and the inner ring fire hole group is arranged at the center of the top of the inner fire cover 1 and communicated with the inner ring air cavity 11. From this, guarantee to have independent secondary air supply channel between inner ring fire and the middle ring fire, for the radial outside of inner ring fire and the radial inboard of middle ring fire supply secondary air better, make the gas burn fully on inner fire lid 1 to inner fire lid lays more thermal load and makes the CO emission low, and heat exchange efficiency is high.

In this embodiment, the inner ring straight fire holes 110 in the inner ring fire hole group are circular holes, the secondary air holes 120 in the air hole group are oblong holes, and the oblong holes are arranged in the length direction along the radial direction, so that the radially inner side of the secondary air holes 120 is closer to the inner ring fire hole group, and the radially outer end is closer to the middle ring fire hole group, thereby effectively increasing the secondary air supplementing width of the secondary air holes 120 in the radial direction. In addition, the radial inner end of the fire transfer groove 15 is arranged close to the air hole group arranged close to the radial inner end, and of course, the radial inner end of the fire transfer groove 15 can also be designed to penetrate through the radial outer side of the cover plate 102 until the radial inner end of the fire transfer groove 15 is close to or communicated with the inner ring fire hole group.

Referring to fig. 10, an air inlet hole group and an ignition needle mounting hole 122 are provided at a position corresponding to the annular air cavity 12 at the bottom of the fire cover body 101, and the ignition needle mounting hole 122 is waist-shaped and is communicated with the annular air cavity 12 for passing through the ignition sensing needle 2. The air intake hole group includes a plurality of bottom air equalizing holes 123 arranged at intervals in the circumferential direction, and each bottom air equalizing hole 123 communicates with the annular air chamber 12 for the passage of secondary air. Therefore, the secondary air flows into the annular air cavity 12 more uniformly through the plurality of bottom air equalizing holes 123 uniformly distributed in the circumferential direction, and the air dividing effect is achieved.

What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.

Claims (11)

1. An inner fire cover is characterized by comprising an inner ring air cavity (11) and an annular air cavity (12), wherein the annular air cavity (12) is positioned at the radial inner side or the radial outer side of the inner ring air cavity (11), an ignition hole group is arranged on the inner ring air cavity (11) close to the cavity wall of the annular air cavity (12), the annular air cavity (12) is communicated with the inner ring air cavity (11) through the ignition hole group,

an inner ring fire hole group is arranged at the position of the top of the inner fire cover, corresponding to the inner ring air cavity (11), and is communicated with the inner ring air cavity (11), and an air hole group is arranged at the position of the top of the inner fire cover, corresponding to the annular air cavity (12), and is communicated with the annular air cavity (12).

2. An inner fire cover according to claim 1, characterized in that an inner inclined surface (142) is provided radially inside the top upper surface of the inner fire cover, the inner inclined surface (142) is arranged radially outwards and downwards from the top center point (141) of the inner fire cover, and the inner fire hole group and the air hole group are both arranged on the inner inclined surface (142).

3. An inner fire cover according to claim 1 or 2, wherein the air hole group comprises a plurality of spaced apart secondary air holes (120); the inner ring fire hole group comprises a plurality of inner ring straight fire holes (110) which are arranged at intervals, and the horizontal sectional area of the inner ring straight fire holes (110) is smaller than the horizontal sectional area of the secondary air holes (120).

4. An inner fire cover according to claim 3, characterized in that the secondary air holes (120) are any of circular holes, oblong holes, polygonal holes, arched holes, snowflake holes, star-shaped holes, heart-shaped holes or pear-shaped holes.

5. An inner fire cover according to claim 1 or 2, characterized in that an opening (121) is provided at the top of the inner fire cover in a position corresponding to the annular air chamber (12), said opening (121) being located directly above the direction of the ignition hole group outlet.

6. An inner fire cover according to claim 1, characterized in that an air inlet hole group and an ignition needle mounting hole (122) are arranged at the bottom of the inner fire cover at the position corresponding to the annular air cavity (12), and the ignition needle mounting hole (122) and the air inlet hole group are respectively communicated with the annular air cavity (12); or a plurality of bottom vent holes (112) which are circumferentially arranged at intervals are arranged at the position of the bottom of the inner fire cover corresponding to the inner ring air cavity (11), and each bottom vent hole (112) is communicated with the inner ring air cavity (11).

7. An inner fire cover according to claim 1, 2 or 6, wherein the inner fire cover is of unitary construction; or the inner fire cover comprises a fire cover body (101) and a cover plate (102), wherein the fire cover body (101) is provided with an inner ring air cavity (11) with an opening at the top, an annular air cavity (12) with an opening at the top and an ignition hole group, the cover plate (102) covers the inner ring air cavity (11) and the opening at the top of the annular air cavity (12), and the cover plate (102) is provided with the inner ring fire hole group and the air hole group.

8. An inner fire cover according to claim 1, characterized in that the inner fire cover is also provided with an intermediate ring air cavity (13), the intermediate ring air cavity (13) is arranged at the periphery of the annular air cavity (12) and the inner ring air cavity (11), and an intermediate ring fire hole group is arranged on the outer side wall or the radial outer side of the top of the inner fire cover and is communicated with the intermediate ring air cavity (13).

9. An inner fire cover according to claim 8, wherein the set of middle fire holes comprises at least one ring of middle fire hole sets, each ring of middle fire hole sets comprising a plurality of middle straight fire holes (130) arranged at intervals along the circumferential direction of the inner fire cover.

10. An inner fire cover according to claim 8, characterized in that a fire transfer groove (15) is provided at the top of the inner fire cover, which fire transfer groove (15) is arranged in radial direction, the radially inner end of which fire transfer groove (15) is in close proximity or communication with the inner ring fire hole group or the air hole group arranged close thereto, and the radially outer end of which fire transfer groove (15) is in communication with the middle ring fire hole group.

11. Burner comprising a fire sensing needle (2), characterized in that it further comprises an inner fire cover according to any one of claims 1-10, said fire sensing needle (2) being mounted in said annular air chamber (12), the air outlet direction of said set of fire holes being directed towards said fire sensing needle (2).