CN112178640A - Infrared burner - Google Patents

Abstract

The invention discloses an infrared burner which comprises a furnace end, an outer burner component and an inner burner component, wherein a plurality of transversely arranged air channels are arranged on the furnace end at intervals, inlets of the air channels are arranged at the upper end of the outer side wall of the furnace end, the outer burner component and the inner burner component are both arranged above the furnace end, the outer side wall of the inner burner component and the inner side wall of the outer burner component at least jointly define an annular air passage with an upward opening, and the annular air passage is communicated with an outlet of the air channel. According to the infrared burner, the secondary air is provided from the outside of the bottom shell of the stove, so that limited primary air does not need to be contended with a nozzle from the inside of the bottom shell of the stove, the air supplement effect is better, and the combustion is more sufficient; in addition, the air channel transversely arranged prevents heat generated by the work of the outer combustion body assembly from radiating to the interior of the furnace end, so that the temperature rise of the bottom of the furnace end is favorably reduced, secondary air can be preheated by the heat absorbed by the air channel, and the combustion heat efficiency is favorably improved.

Description

Infrared burner

Technical Field

The invention relates to the technical field of cooking utensils, in particular to an infrared burner for an energy-gathering stove.

Background

The infrared stove is more and more popular with consumers due to higher thermal efficiency and lower CO emission, the three-ring infrared burner enables flame to be divided into more zones, firepower can be divided into more sections, the purpose of accurately controlling the firepower during cooking is achieved, and cooking experience is better.

Chinese patent CN110207110A discloses a "three-ring infrared burner", in which a vertical secondary air channel leading to the center of the burner is provided in the inner gas-distributing plate, the secondary air required by the middle ring and the inner ring combustion plate is provided from the bottom shell of the cooker, and the primary air required by the burner is also provided from the bottom shell. If the embedded kitchen range and the cabinet are not provided with the air inlet holes or the area of the air inlet holes is insufficient, the air in the bottom shell of the kitchen range is not enough for the normal combustion of the combustor, so that the insufficient combustion is caused.

Disclosure of Invention

The invention aims to solve one of the problems in the prior related art at least to a certain extent, and therefore the invention provides the infrared burner, the air channel is transversely arranged, so that the air supplement effect is better, the combustion is more sufficient, limited primary air does not need to be contended with a nozzle from the inner part of a bottom shell of the stove, the air flowing through the air channel can be preheated, the combustion heat efficiency is improved, and the temperature rise of the stove head is reduced.

According to the infrared burner provided by the above, the following technical scheme is adopted to realize the following:

an infrared burner comprising: the burner is provided with an outer ring air cavity and an inner ring air cavity which are opened upwards, a plurality of transversely arranged air channels are arranged on the burner at intervals, and inlets of the air channels are arranged at the upper end of the outer side wall of the burner; the outer combustion body assembly is covered above the outer ring air cavity; the inner combustion body assembly is arranged above the inner ring air cavity in a covering mode, an annular air passage with an upward opening is defined by the outer side wall of the inner combustion body assembly and the inner side wall of the outer combustion body assembly at least, and the annular air passage is communicated with an outlet of the air passage.

In some embodiments, the air passage crosses the outer ring air cavity and divides the outer ring air cavity into an upper part and a lower part, the outer ring air cavity is formed with an outer ring air outlet for gas to pass through at a position between two adjacent air passages, and the upper part and the lower part of the outer ring air cavity are communicated through the outer ring air outlet.

In some embodiments, the number of the air passages is four, the four air passages are uniformly spaced along the circumferential direction of the burner, the length L of the air passages along the circumferential direction is less than one eighth of the circumference of the outer ring outer wall of the outer ring air chamber, and the length L is greater than one eighth of the circumference of the inner ring outer wall.

In some embodiments, an inward extending boss is circumferentially arranged on the outer wall of the inner ring, the boss is located below the outlet, the inner combustion body assembly comprises an inner air distribution plate, the inner air distribution plate is mounted above the inner ring air cavity, a positioning portion extending outwards is circumferentially arranged on the outer side wall of the inner air distribution plate, the positioning portion abuts against the top surface of the boss, and the outer side wall of the inner air distribution plate, the upper end of the outer wall of the inner ring and the inner side wall of the outer combustion body assembly jointly define the annular air passage.

In some embodiments, the outer burner body assembly includes an outer gas distribution plate mounted above the outer annular gas chamber and abutting against an upper end surface of the inner annular outer wall, and a gap is formed between an upper end of an outer side wall of the inner gas distribution plate and an inner side wall of the outer gas distribution plate, and the gap constitutes an upper section of the annular gas duct.

In some embodiments, the burner is provided with a middle annular air cavity between the outer annular air cavity and the inner annular air cavity, and the outer burner assembly has an inner annular air cavity and an outer annular air cavity which are arranged at intervals, the inner annular air cavity is communicated with the middle annular air cavity, and the outer annular air cavity is communicated with the inner annular air cavity.

In some embodiments, the air passage crosses the middle air chamber and divides the middle air chamber into an upper part and a lower part, the middle air chamber is formed with a middle air outlet for gas to pass through at a position between two adjacent air passages, and the upper part and the lower part of the middle air chamber are communicated through the middle air outlet.

In some embodiments, the burner is provided with a lower central hole, the inner combustion body assembly is provided with an upper central hole communicated with the lower central hole, the ignition device is arranged at the lower central hole and the upper central hole, the upper end of the ignition device extends to the upper part of the upper central hole, and the inner air distribution disc of the inner combustion body assembly can be reliably connected with the burner through the ignition device.

In some embodiments, the ignition device includes a bracket assembly and an ignition needle, the bracket assembly is installed in the lower central hole and the upper central hole, the lower end of the bracket assembly is connected with the furnace end, the upper end of the bracket assembly is abutted to the inner air distribution plate, the bracket assembly is provided with a mounting hole, the ignition needle is arranged at the mounting hole, and the ignition needle can rotate between a locking position and a zero position of the inner combustion body assembly to be detached.

In some embodiments, the bracket assembly includes a bracket and a fixing seat having the mounting hole, the bracket is connected to the furnace end and the fixing seat respectively, an elastic portion extending towards the direction of the inner air distribution plate is provided on the bracket, the elastic portion is pressed against the lower end of the inner side wall of the upper central hole, and the elastic portion can push the fixing seat to abut against the upper end of the inner side wall of the upper central hole through the bracket.

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

1. according to the infrared burner, secondary air is provided by the atmosphere on the upper side of the stove panel through the transversely arranged air channel and the annular air passage in sequence, limited primary air does not need to be contended with a nozzle from the inside of the bottom shell of the stove, so that the air supplement effect is better, and the more sufficient combustion is ensured;

2. the air channels which are transversely arranged prevent heat generated by the work of the outer combustion body assembly from vertically radiating downwards into the furnace end, so that the temperature rise of the furnace end is favorably reduced, secondary air flowing through the air channels can be preheated by the heat absorbed by the air channels, and the combustion heat efficiency is favorably improved.

Drawings

FIG. 1 is a schematic view of the construction of an infrared burner in embodiment 1 of the present invention;

FIG. 2 is a sectional view of an infrared burner in embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a burner in embodiment 1 of the present invention;

fig. 4 is a sectional view of a burner and inner and outer burner assemblies according to example 1 of the present invention;

FIG. 5 is a schematic view of the structure of a ignition device in embodiment 1 of the present invention;

fig. 6 is a partially enlarged view of a portion a in fig. 4.

Detailed Description

The present invention is illustrated by the following examples, but the present invention is not limited to these examples. Modifications to the embodiments of the invention or equivalent substitutions of parts of technical features without departing from the spirit of the invention are intended to be covered by the scope of the claims of the invention.

Example 1

Referring to fig. 1-3, the present embodiment provides an infrared burner, including a burner head 1, an outer burner body assembly 2 and an inner burner body assembly 3, wherein the burner head 1 is provided with an outer ring air cavity 11 and an inner ring air cavity 12 that are open upward, a plurality of air channels 10 that are transversely arranged are provided at intervals on the burner head 1, an inlet 101 of the air channel 10 is provided at the upper end of the outer side wall of the burner head 1 and is located above a panel of the cooker, and an outlet 102 is located on the inner ring outer wall 121 of the inner ring air cavity 12 and is communicated with the inner ring air cavity 12, so as to ensure secondary air required for combustion of the infrared burner, the air at the upper side of the panel of the cooker is provided through the air channel 10 that is transversely provided on the burner head 1, thereby achieving secondary air supplement from the external environment of the cooker, without contending for limited primary air from the. The outer burner assembly 2 is of an annular configuration and is disposed above the outer annular air chamber 11 to form an outer annular fire. The inner burner body assembly 3 is covered above the inner ring air chamber 12 to form an inner ring fire, and the outer side wall of the inner burner body assembly 3 and the inner side wall of the outer burner body assembly 2 at least jointly define an annular air passage 4 with an upward opening, and the annular air passage 4 is communicated with the outlet 102 of the air passage 10. In this embodiment, the outer side wall of the inner burner assembly 3 and the upper end of the inner ring outer wall 121 of the inner ring air cavity 12 and the inner side wall of the outer burner assembly 2 respectively define the annular air passage 4, so that the secondary air can flow out upwards through the annular air passage 4 in the air passage 10 transversely arranged by the atmospheric pressure person on the upper side of the stove panel, thereby realizing the purpose of supplementing the secondary air required by combustion to the inner side of the inner ring fire and the outer ring fire, and ensuring more sufficient combustion.

It can be seen that the infrared burner of this embodiment, it is through being equipped with a plurality of transverse arrangement's air passage 10 on furnace end 1 at the interval to the annular air flue 4 that intercommunication air passage 10 is injectd jointly to the lateral wall of interior burning body subassembly 3 and the inside wall of outer burning body subassembly 2 at least, thereby make the secondary air provide via air passage 10 and annular air flue 4 by the atmosphere of cooking utensils panel upside, need not to compete limited primary air with the nozzle from the inside of cooking utensils drain pan, make the secondary air supply effect better, guarantee that the burning is more abundant. In addition, the air channel 10 transversely arranged can prevent the heat generated by the work of the outer combustion body assembly 2 from vertically radiating downwards to the interior of the furnace end 1, so that the temperature rise of the furnace end 1 can be reduced, and the temperature rise in the bottom shell of the stove can be further reduced. In addition, the heat absorbed by the air passage 10 can preheat the secondary air flowing through the air passage 10, so that the utilization rate of radiant heat is improved, and the combustion heat efficiency is improved.

Specifically, the air channels 10 cross the outer ring air cavity 11 and divide the outer ring air cavity 11 into an upper part and a lower part, an outer ring air outlet (not shown in the figure) for gas to pass through is formed at a position between two adjacent air channels 10 of the outer ring air cavity 11, and the upper part and the lower part of the outer ring air cavity 11 are communicated through the outer ring air outlet. Therefore, the air channel 10 transversely arranged divides the outer ring air cavity 11 into a plurality of parts, on one hand, the radiation of partial heat to the bottom of the outer ring air cavity 11 is prevented, the temperature rise of the bottom of the burner 1 and the inner part of the bottom shell of the stove is favorably reduced, and the secondary air flowing through the air channel 10 is preheated, so that the heat efficiency of combustion is improved; on the other hand, the gas flowing out of the outer ring gas outlet can be ensured to fill the upper part of the outer ring gas cavity 11 and then overflow to the outer combustion body assembly 2, so that the gas flow velocity flowing to each position above the outer ring gas cavity 11 is ensured to be basically equal, and the combustion uniformity of the outer ring fire is improved.

Referring to fig. 3, preferably, the number of the air channels 10 is four, the four air channels 10 are uniformly spaced along the circumferential direction of the burner head 1, the length L of the air channels 10 along the circumferential direction is less than one eighth of the circumference of the outer ring outer wall 111 of the outer ring air cavity 11, and the length L is greater than one eighth of the circumference of the inner ring outer wall 121, so as to ensure that the air channels 10 do not affect the air outlet effect of the outer ring air cavity 11.

Further, the burner 1 of the present embodiment is further provided with an intermediate annular chamber 13 which is opened upward, the intermediate annular chamber 13 is located between the outer annular chamber 11 and the inner annular chamber 12, the outer annular wall of the intermediate annular chamber 13 is the outer annular inner wall 112 of the outer annular chamber 11, and the inner annular wall is the inner annular outer wall 121 of the inner annular chamber 12. From this, the setting of well annular chamber 13 for the infrared burner can possess outer, well and interior three ring fire, makes cooking utensils have more segmentation firepower, can reach the purpose of firepower accurate control during the culinary art, and culinary art experience is better.

Specifically, the air passages 10 also cross the middle air chamber 13 and divide the middle air chamber 13 into upper and lower portions, the middle air chamber 13 is formed with a middle air outlet for gas to pass through at a position between two adjacent air passages 10, and the upper and lower portions of the middle air chamber 13 are communicated through the middle air outlet. Therefore, the transversely arranged air channel 10 also divides the middle air cavity 13 into a plurality of parts, on one hand, the radiation of partial heat to the bottom of the middle air cavity 13 is prevented, and the reduction of the temperature rise of the bottom of the burner 1 and the inner part of the bottom shell of the cooker is facilitated; on the other hand, the gas flowing out from the middle ring gas outlet can be ensured to fill the upper part of the middle ring gas cavity 13 first and then overflow, which is beneficial to ensuring that the gas flow velocity flowing to each position above the middle ring gas cavity 13 is basically equal and improving the combustion uniformity of middle ring fire.

Further, the burner 1 is provided with a lower center hole 14 for facilitating the mounting of the ignition device 5, an upper end surface of the lower center hole 14 is lower than an upper end surface of the inner ring outer wall 121 of the inner ring air chamber 12, and a peripheral wall of the lower center hole 14 constitutes an inner ring inner wall 123 of the inner ring air chamber 12. In addition, a boss 122 extending toward the lower center hole 14 is provided in the inner ring outer wall 121 of the inner ring air chamber 12, and the boss 122 is used for supporting the inner burner body assembly 3 to limit and position the installation position of the inner burner body assembly 3.

Further, the infrared gas burner further comprises an outer injection pipe 61, an inner injection pipe 62 and a middle injection pipe 63, wherein the outer injection pipe 61 is respectively provided with a gas valve of the cooker and the outer ring gas cavity 11, the inner injection pipe 62 is respectively provided with a gas valve of the cooker and the inner ring gas cavity 12, and the middle injection pipe 63 is respectively provided with a gas valve of the cooker and the middle ring gas cavity 13, so that a user can conveniently control the firepower of the infrared burner through the gas valve of the cooker.

Referring to fig. 1 to 3, in particular, the outer burner assembly 2 includes an outer distributor 21 and an outer burner 22, the outer distributor 21 is mounted above the outer annular air chamber 11 and the middle annular air chamber 13 and abuts against the upper end surface of the inner annular outer wall 121, and a gap (not shown) is formed between the upper end of the outer side wall of the inner burner assembly 3 and the inner side wall of the outer distributor 21, and the gap constitutes the upper section of the annular air duct 4, so that the secondary air flowing out of the annular air duct 4 supplements sufficient air to the inner sides of the inner annular flame and the outer burner 22, ensuring more sufficient combustion of the inner burner assembly 3 and the inner sides of the outer burner 22, and improving the heat efficiency.

In addition, an inner air distribution cavity 211 and an outer air distribution cavity 212 which are arranged at intervals are formed inside the inner air distribution disc 31, the inner air distribution cavity 211 is communicated with the middle air distribution cavity 13, and the outer air distribution cavity 212 is communicated with the inner air distribution cavity 12. The outer burner 22 is installed in the inner branch air disk 31, and the outer burner 22 covers the upper portions of the inner branch air cavity 211 and the outer branch air cavity 212, so that the outer burner 22 has a middle ring fire area and an outer ring fire area, the fire control of the outer burner is ensured to be finer, and secondary air flowing out of the annular air passage 4 can supplement sufficient air to the inner ring fire and the middle ring fire, and the combustion of the inner ring fire and the middle ring fire is further improved.

Referring to fig. 1-3, specifically, the inner burner assembly 3 includes an inner gas distribution plate 31 and an inner burner 32, the inner gas distribution plate 31 is annular and has an upper central hole 312 corresponding to the lower central hole 14, a positioning portion 311 extending outward is circumferentially provided at a lower end of an outer side wall of the inner gas distribution plate 31, when the inner gas distribution plate 31 is installed, the inner gas distribution plate 31 is installed above the inner ring air cavity 12, a lower end of the inner side wall of the inner gas distribution plate 31 is inserted into the lower central hole 1, so that the upper central hole 312 is communicated with the lower central hole 14, a lower end of the outer side wall of the inner gas distribution plate 31 is inserted into the inner ring air cavity 12, and a bottom surface of the positioning portion 311 abuts against a top surface of the boss 122. In this embodiment, the outer side wall of the inner air distribution disc 31, the upper end of the inner ring outer wall 121 of the inner ring air cavity 12 and the inner side wall of the outer air distribution disc 21 define the annular air passage 4 together, so that the annular air passage 4 for supplementing secondary air is effectively ensured between the inner ring fire and the middle ring fire, and sufficient secondary air is provided for the inner ring fire and the middle ring fire through the outer ring environment of the cooker.

Referring to fig. 4-6, further, the burner head 1 further comprises an ignition device 5, the lower central hole 14 of the burner head 1 is communicated with the upper central hole 312 of the inner gas distribution plate 31, and the lower central hole 14 and the upper central hole 312 which are communicated with each other jointly form a central through hole (not shown in the figure) of the infrared burner. The ignition device 5 is arranged at the lower central hole 14 and the upper central hole 312, the upper end of the ignition device extends to the upper part of the upper central hole 312, and the inner gas distribution disc 31 of the inner burner component 3 can be reliably connected with the burner 1 through the ignition device 5, so that the inner gas distribution disc 31 is indirectly and reliably connected with the burner 1, the connection reliability between the burner 1 and the inner gas distribution disc 31 is further improved, the inner burner component 3 and the burner 1 are ensured to be in a conduction state, and the reliability of an induction loop of the infrared burner is further ensured.

Specifically, the ignition device 5 includes a bracket assembly 51 and an ignition needle 52, the bracket assembly 51 is installed in the lower central hole 14 and the upper central hole 312, the lower end of the bracket assembly 51 is connected to the burner 1, and the upper end of the bracket assembly 51 abuts against the inner gas distribution plate 31, so that the bracket assembly 51 realizes reliable connection between the burner 1 and the inner gas distribution plate 31, and ensures that the inner combustion body assembly 3 is in a conduction state with the burner 1.

In addition, a mounting hole (not shown in the figure) is arranged on the bracket assembly 51, the ignition needle 52 is arranged at the mounting hole, the upper end of the ignition needle 52 protrudes above the mounting hole, the ignition needle 52 can rotate between a locking position and a zero position for detaching the inner combustion body assembly 3, and the ignition needle 52 is electrically connected with a stove controller arranged in a stove bottom shell through a lead. When the ignition needle 52 is rotated to the zero position, the inner burner assembly 3 can be removed for the user to clean, and is re-installed in the burner 1 after the cleaning; when the ignition needle 52 rotates to the locking position, the inner combustion body assembly 3 cannot be detached, the ignition needle 52 is positioned on the support assembly 51, the ignition needle 52 is ensured to be stably and reliably installed, the infrared combustor can be normally used at the moment, and the ignition needle 52, the stove controller, the stove bottom shell, the stove head 1 and the inner combustion body assembly 3 form an induction loop.

Specifically, the bracket assembly 51 includes a bracket 511 and a fixing base 512 having a mounting hole, the bracket 511 is respectively connected to the burner 1 and the fixing base 512, an elastic portion 501 extending toward the inner air distribution plate 31 is disposed on the bracket 511, the elastic portion 501 is tightly pressed against the lower end of the inner side wall of the upper central hole 312, and the elastic portion 501 can push the fixing base 512 to abut against the upper end of the inner side wall of the upper central hole 312 through the bracket 511. In this way, the bracket 511 and the elastic part 501 arranged on the bracket 511 are used for clamping the bracket 511 and the elastic part 501 on two opposite inner side walls of the upper central hole 312, so that the burner 1 and the inner air distribution plate 31 are indirectly connected reliably, the connection and the abutment between the burner 1 and the inner air distribution plate 31 are further enhanced, and the induction loop is ensured to be more reliable. Preferably, the fixing base 51 and the bracket 511 are both metal pieces capable of conducting electricity to ensure the conducting effect.

Preferably, support 511 is "L" or "Z" font, and the bottom surface of support 511 passes through screw fastening and connects in furnace end 1 bottom, and the top surface is reliably connected with fixing base 512, and elastic component 501 is the flexure strip, and the one end integrated into one piece of this flexure strip sets up on the vertical face of support 511, and the other end orientation deviates from ignition needle 52 direction and extends, not only guarantees that elastic component 501 and support 511's connection is reliable and stable, still makes things convenient for the quick machine-shaping of elastic component 501, has improved the utilization ratio of the vertical face of support 511.

Referring to fig. 6, when one end of the elastic piece away from the bracket 511 abuts against the lower end of the inner side wall of the upper central hole 312 of the inner air distribution plate 31, the elastic piece can push the fixing base 512 to move towards the direction opposite to the elastic piece through the bracket 511, so that the fixing base 512 tightly abuts against the upper end of the inner side wall of the upper central hole 312, and further the fixing base 512 is clamped between the bracket 511 and the inner side wall of the upper central hole 312 of the inner air distribution plate 31, thereby further ensuring the connection reliability between the fixing base 512 and the inner air distribution plate 31.

Referring to fig. 5-6, more specifically, the ignition device 5 further includes a spring 53 and a snap ring 54, the snap ring 54 is clamped on the outer surface of the ignition needle 52 and is located below the fixing seat 512, the spring 53 is sleeved on the outer surface of the ignition needle 52, and the upper end and the lower end of the spring 53 respectively abut against the fixing seat 512 and the snap ring 54.

Example 2

This embodiment is different from embodiment 1 in that the infrared burner has only the inner ring fire and the outer ring fire. Specifically, the burner 1 omits the outer ring inner wall 112 of the outer ring air chamber 11, so that the outer ring air chamber 11 and the middle ring air chamber 13 are merged to form one outer ring air mixing chamber. Correspondingly, the outer burner body assembly 2 eliminates the need for a partition plate that separates the outer gas distribution disk 21 into the inner gas distribution chamber 211 and the outer gas distribution chamber 212, thereby allowing the inner gas distribution chamber 211 and the outer gas distribution chamber 212 to merge to form a larger gas chamber that communicates with the outer gas mixing chamber. The annular air duct 4 is located between the outer burner assembly 2 and the inner burner assembly 3, and the secondary air flowing upward from the annular air duct 4 is used to supplement sufficient air to the radially inner side of the outer burner assembly 2 and the inner burner assembly 3 to ensure more complete combustion of the inner ring fire and the outer ring fire and improve the thermal efficiency. The rest of the process was the same as in example 1.

It can be seen that the infrared burner has only the inner ring fire and the outer ring fire by omitting the middle ring air chamber 13 and the inner air distribution chamber 211 of the outer air distribution plate 21, so that the structure of the whole infrared burner is simpler and the manufacturing cost is lower.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims (10)

1. An infrared burner, comprising:

the burner comprises a burner (1), wherein the burner (1) is provided with an outer ring air cavity (11) and an inner ring air cavity (12) which are opened upwards, a plurality of transversely arranged air channels (10) are arranged on the burner (1) at intervals, and inlets (101) of the air channels (10) are arranged at the upper end of the outer side wall of the burner (1);

the outer burner assembly (2), the said outer burner assembly (2) is covered and located above the said outer ring air cavity (11);

the inner combustion body assembly (3) is arranged above the inner ring air cavity (12) in a covering mode, an annular air passage (4) with an upward opening is at least defined by the outer side wall of the inner combustion body assembly (3) and the inner side wall of the outer combustion body assembly (2) together, and the annular air passage (4) is communicated with an outlet (102) of the air passage (10).

2. An infrared burner according to claim 1, wherein the air passages (10) cross the outer ring air chamber (11) and divide the outer ring air chamber (11) into an upper part and a lower part, the outer ring air chamber (11) is formed with an outer ring air outlet for gas to pass through at a position between two adjacent air passages (10), and the upper part and the lower part of the outer ring air chamber (11) are communicated through the outer ring air outlet.

3. An infrared burner according to claim 1 or 2, characterized in that the number of said air channels (10) is four, four of said air channels (10) are evenly spaced in the circumferential direction of said burner head (1), the length L of said air channels (10) in the circumferential direction is less than one eighth of the circumference of the outer ring outer wall (111) of said outer ring air chamber (11), and said length L is greater than one eighth of the circumference of said inner ring outer wall (121).

4. An infrared burner according to claim 1, characterized in that the inner ring outer wall (121) is circumferentially provided with an inwardly extending boss (122), the boss (122) is located below the outlet (102), the inner burner body assembly (3) comprises an inner gas distribution plate (31), the inner gas distribution plate (31) is mounted above the inner ring gas chamber (12), an outwardly extending positioning portion (311) is circumferentially provided on an outer side wall of the inner gas distribution plate (31), the positioning portion (311) abuts against a top surface of the boss (122), and the outer side wall of the inner gas distribution plate (31) defines the annular gas duct (4) together with an upper end of the inner ring outer wall (121) and an inner side wall of the outer burner body assembly (2).

5. An infrared burner according to claim 4, characterized in that the outer burner body assembly (2) comprises an outer gas distribution disc (21), the outer gas distribution disc (21) is mounted above the outer ring air cavity (11) and abuts against the upper end face of the inner ring outer wall (121), a gap is formed between the upper end of the outer side wall of the inner gas distribution disc (31) and the inner side wall of the outer gas distribution disc (21), and the gap constitutes the upper section of the annular gas duct (4).

6. An infrared burner according to claim 1, characterized in that the burner head (1) is provided with an intermediate air cavity (13) between the outer annular air cavity (11) and the inner annular air cavity (12), the outer burner body assembly (2) has an inner air cavity (211) and an outer air cavity (212) arranged at an interval, the inner air cavity (211) communicates with the intermediate air cavity (13), and the outer air cavity (212) communicates with the inner annular air cavity (12).

7. An infrared burner according to claim 6, characterized in that said air passages (10) cross said middle annular chamber (13) and divide said middle annular chamber (13) into upper and lower portions, said middle annular chamber (13) being formed with middle annular air outlets for gas passage at a position between two adjacent air passages (10), said upper and lower portions of said middle annular chamber (13) being communicated through said middle annular air outlets.

8. An infrared burner according to claim 1 or 6, characterized in that it further comprises an ignition device (5), said burner (1) is provided with a lower central hole (14), said inner burner body assembly (3) is provided with an upper central hole (312) communicating with said lower central hole (14), said ignition device (5) is provided at said lower central hole (14) and said upper central hole (312) and its upper end extends above said upper central hole (312), an inner gas disk (31) of said inner burner body assembly (3) is capable of being securely connected with said burner (1) through said ignition device (5).

9. An infrared burner according to claim 8, characterized in that said ignition means (5) comprises a bracket assembly (51) and an ignition needle (52), said bracket assembly (51) being mounted in said lower central hole (14) and said upper central hole (312), and said bracket assembly (51) being connected at its lower end to said burner head (1) and at its upper end to said inner disk (31), and said bracket assembly (51) being provided with mounting holes at which said ignition needle (52) is provided, and said ignition needle (52) being rotatable between a locking position and a zero position in which said inner burner assembly (3) is removed.

10. The infrared burner as claimed in claim 9, wherein the bracket assembly (51) includes a bracket (511) and a fixing base (512) having the mounting hole, the bracket (511) connects the burner (1) and the fixing base (512), an elastic portion (501) extending toward the inner air distribution plate (31) is disposed on the bracket (511), the elastic portion (501) is pressed against the lower end of the inner side wall of the upper central hole (312), and the elastic portion (501) can push the fixing base (512) against the upper end of the inner side wall of the upper central hole (312) through the bracket (511).

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