Blast burner

Abstract

The utility model discloses a blast burner which comprises a burner assembly and a blast assembly. The combustor assembly comprises a combustor body and an air suction pipeline. The blast assembly comprises a fuel gas flow outlet and an air flow outlet; the gas flow outlet and the air flow outlet are both located in the side, facing the air suction pipeline, of the air blowing assembly. An air inlet of the air suction pipeline is opposite to the gas flow outlet and the air flow outlet, and a gap is formed between the air inlet of the air suction pipeline and the air flow outlet; according to the combustor, the primary air coefficient can be effectively increased, the combustion efficiency of fuel gas is promoted, the flame temperature is increased, and the heat efficiency of a kitchen range is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a forced-draft burner. Background Art

[0002] Gas stoves are essential kitchen cooking utensils in daily family life. During the use of burners, the supply of primary air and secondary air will affect the combustion efficiency and thus the energy efficiency grade of the gas stove. In existing burners, after the gas is ejected from the nozzle, it draws in primary air through natural entrainment to form a mixed gas. The mixed gas flows to the burner flame holes for combustion, and secondary air is supplemented from the space around the flame holes for continuous combustion. Such burners have the problem of insufficient entrainment, resulting in disadvantages such as low combustion thermal efficiency and more waste gas emissions.

[0003] Figure 1 is a partial structural schematic diagram of a burner in the prior art. As Figure 1 shown, in the prior art, a wind guide cylinder 01 with an axial opening (i.e., opening a) is arranged on one side facing the burner. A gas nozzle 02 is arranged in the wind guide cylinder 01. The air outlet of the wind guide cylinder 01 is docked with the suction pipe 03 of the burner. The opening a of the wind guide cylinder 01 is arranged on the side wall of the wind guide cylinder 01 and surrounds the outer periphery of the gas nozzle 02. The air outlet of the blower is connected to the opening a of the wind guide cylinder 01. Then the gas can be transported to the suction pipe 03 through the gas nozzle 02, and the blower can send in primary air through the opening a on the peripheral wall of the wind guide cylinder 01. Thus, the air introduced from the blower will surround the gas nozzle 02 in a circle, making the air introduced by the blower form a "wind curtain". There is usually a gap when the wind guide cylinder 01 and the suction pipe 03 are docked. The formed "wind curtain" will blow the air between the wind guide cylinder 01 and the suction pipe 03 out through the gap, preventing the natural air at the port of the suction pipe 03 from being entrained into the burner, thus affecting the supply of the naturally entrained air. Summary of the Utility Model

[0004] The utility model provides a forced-draft burner to achieve dual air supply, namely the air supply from the blower to the burner and the air supply from natural entrainment.

[0005] According to one aspect of the utility model, a forced-draft burner is provided, comprising: a burner assembly and a forced-draft assembly;

[0006] The burner assembly includes a burner body and a suction pipe;

[0007] The forced-draft assembly includes a gas flow outlet and an air flow outlet;

[0008] Both the gas flow outlet and the air flow outlet are located on the side of the air blower assembly facing the suction pipeline; the intake port of the suction pipeline is disposed opposite to the gas flow outlet and the air flow outlet, and there is a gap between the intake port of the suction pipeline and the air flow outlet;

[0009] The outlet of each suction pipeline is connected to the burner body.

[0010] Optionally, the air blower assembly further includes: a gas passage and an air passage;

[0011] The air passage is communicated with the air flow outlet, and the intake port of the air passage is communicated with the outlet of the air blower;

[0012] The gas passage is communicated with the corresponding gas flow outlet, and the intake port of the gas passage is communicated with the gas supply device;

[0013] The gas passage and the air passage are isolated from each other.

[0014] Optionally, the width of the gap is D; 2mm ≤ D ≤ 12mm.

[0015] Optionally, the width of the gap is D; D = 8.5mm.

[0016] Optionally, the burner body includes an inner ring burner and an outer ring burner;

[0017] The suction pipelines in the burner assembly include an inner ring suction pipeline and an outer ring suction pipeline;

[0018] The outlet of the inner ring suction pipeline is connected to the inner ring burner, and the outlet of the outer ring suction pipeline is connected to the outer ring burner.

[0019] Optionally, the gas flow outlet includes an inner ring gas flow outlet and an outer ring gas flow outlet;

[0020] The air flow outlet includes at least one inner ring air flow outlet and at least one outer ring air flow outlet;

[0021] Each inner ring air flow outlet and the inner ring gas flow outlet are disposed opposite to the intake port of the inner ring suction pipeline;

[0022] Each outer ring air flow outlet and the outer ring gas flow outlet are disposed opposite to the intake port of the outer ring suction pipeline.

[0023] Optionally, the flow area of the outer ring air flow outlet is S1, and the flow area of the inner ring air flow outlet is S2;

[0024] 1.1 ≤ S1 / S2 ≤ 6.25.

[0025] Optionally, S1 / S2 = 2.2.

[0026] Optionally, the flow area of the outer ring air flow outlet is S1, and the flow area of the air inlet of the outer ring air suction pipe is S3;

[0027] 0.0075 ≤ S1 / S3 ≤ 0.05.

[0028] Optionally, S1 / S3 = 0.009.

[0029] The blast burner provided by the present utility model is provided with a blast assembly including a gas flow outlet and an air flow outlet, so that the blast assembly can supply gas and air to the burner body through the gas flow outlet and the air flow outlet. The gas flow outlet and the air flow outlet on the blast assembly are both located on the side of the blast assembly facing the air suction pipe, and the air flow outlet is arranged opposite to the air inlet of the air suction pipe with a gap therebetween. When the fan supplies air to the air suction pipe through the air flow outlet, it will not affect the entrainment of natural air into the air suction pipe, and it can simultaneously achieve the dual air supply of the air supply from the fan to the burner and the natural air supply by natural entrainment, thereby effectively increasing the primary air coefficient, promoting the combustion efficiency of the gas and increasing the flame temperature, which is beneficial to improving the thermal efficiency of the blast burner.

[0030] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 is a partial structural schematic diagram of a burner in the prior art;

[0033] Figure 2 is a structural schematic diagram of a blast burner provided by an embodiment of the present utility model;

[0034] Figure 3 is a structural schematic diagram of a blast assembly provided by an embodiment of the present utility model;

[0035] Figure 4It is a schematic structural diagram of a burner assembly provided by an embodiment of the present utility model;

[0036] Figure 5 It is a schematic structural diagram of another burner assembly provided by an embodiment of the present utility model;

[0037] Figure 6 It is a partial structural schematic diagram of a forced-draft burner provided by an embodiment of the present utility model;

[0038] Figure 7 It is a schematic structural diagram of yet another burner assembly provided by an embodiment of the present utility model;

[0039] In the figure:

[0040] 1 - Burner assembly; 2 - Blower assembly; 3 - Fan;

[0041] 11 - Burner body; 12 - Suction pipe; 21 - Gas passage; 22 - Air passage;

[0042] 111 - Inner-ring burner; 112 - Outer-ring burner; 121 - Inner-ring suction pipe; 122 - Outer-ring suction pipe; 211 - Inner-ring gas passage; 212 - Outer-ring gas passage;

[0043] 1211 - Inner-ring suction diffuser; 1212 - Inner-ring suction mixing pipe; 1213 - Inner-ring suction contraction pipe; 1221 - Outer-ring suction diffuser; 1222 - Outer-ring suction mixing pipe; 1223 - Outer-ring suction contraction pipe;

[0044] A1 - Gas flow outlet; A2 - Gas flow inlet; B1 - Air flow outlet; B2 - Air flow inlet; C1 - Inlet of the suction pipe; C2 - Outlet of the suction pipe; H0 - Air domain; D - Width of the gap;

[0045] A11 - Inner-ring gas flow outlet; A12 - Outer-ring gas flow outlet A12; B11 - Inner-ring air flow outlet B11; B12 - Outer-ring air flow outlet B12; C11 - Inlet of the inner-ring suction pipe; C12 - Inlet of the outer-ring suction pipe; C21 - Outlet of the inner-ring suction pipe; C22 - Outlet of the outer-ring suction pipe. Detailed implementation manners

[0046] To enable those skilled in the art to better understand the solution of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0047] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0048] Figure 2 is a schematic structural diagram of a blast burner provided by an embodiment of the present utility model, Figure 3 is a schematic structural diagram of a blast assembly provided by an embodiment of the present utility model, Figure 4 is a schematic structural diagram of a burner assembly provided by an embodiment of the present utility model, Figure 5 is a schematic structural diagram of another burner assembly provided by an embodiment of the present utility model, Figure 6 is a partial schematic structural diagram of a blast burner provided by an embodiment of the present utility model. With reference to Figures 2 to 6 , the blast burner includes: a burner assembly 1 and a blast assembly 2; the burner assembly 1 includes a burner body 11 and a suction pipe 12; the blast assembly 2 includes a gas flow outlet A1 and an air flow outlet B1. Both the gas flow outlet A1 and the air flow outlet B1 are located on the side of the blast assembly 2 facing the suction pipe 12; the intake ports C1 of the suction pipes 12 are arranged opposite to the gas flow outlet A1 and the air flow outlet B1, and there is a gap between the intake port C1 of the suction pipe 12 and the air flow outlet B1; the outlet port C2 of the suction pipe 12 is connected to the burner body 11.

[0049] Specifically, the gas flow outlet A1 and the air flow outlet B1 of the air blowing assembly 2 can be located on the side of the air blowing assembly 2 facing the suction pipeline 12, and are oppositely arranged with the air inlet C1 of the suction pipeline 12. The gas flow outlet A1 can be set as a nozzle structure. On the side of the air blowing assembly 2 facing the suction pipeline 12, the extension length of the nozzle structure towards the suction pipeline 12 can be greater than the extension length of the air flow outlet B1 towards the suction pipeline 12, so that the gas flow outlet A1 can extend into the corresponding suction pipeline 12 to supply all the gas to the burner body 11.

[0050] Both the gas flow outlet A1 and the air flow outlet B1 are located on the same side of the air blowing assembly 2 and are oppositely arranged with the air inlet C1 of the suction pipeline 12, so that the air blowing assembly 2 can supply air and gas to the suction pipeline 12 through the gas flow outlet A1 and the air flow outlet B1. Then the suction pipeline 12 can transport the air and gas to the inside of the burner body 11 for mixed combustion. A gap is provided between the air flow outlet B1 and the air inlet C1 of the suction pipeline 12, so that an air domain H0 is left between the air inlet C1 of the suction pipeline 12 and the air flow outlet B1 of the air blowing assembly 2. In this way, the air in the air domain H0 can enter the suction pipeline 12 by natural entrainment, and then can be sent into the burner body 11 through the suction pipeline 12 to realize the natural air supply to the burner. Since the air flow outlet B1 is oppositely arranged with the air inlet C1 of the suction pipeline 12, when the fan 3 supplies air to the suction pipeline 12 through the air flow outlet B1, a "wind curtain" will not be formed around the gas flow outlet A1, thus not affecting the entrainment of natural air in the air domain H0 into the burner. It can simultaneously realize the dual air supply of the primary air supply of the fan to the burner and the natural air supply of natural entrainment, thereby effectively increasing the primary air coefficient, promoting the combustion efficiency of the gas and increasing the flame temperature, which is beneficial to improving the thermal efficiency of the cooker.

[0051] In the embodiment of the present utility model, the air blowing assembly is provided with a gas flow outlet and an air flow outlet, so that the air blowing assembly can supply gas and air to the burner assembly through the gas flow outlet and the air flow outlet. The gas flow outlet and the air flow outlet on the air blowing assembly are both located on the side of the air blowing assembly facing the suction pipeline, and it is provided that the air flow outlet is oppositely arranged with the air inlet of the suction pipeline and there is a gap, which can ensure that when the fan supplies air to the suction pipeline through the air flow outlet, it will not affect the entrainment of natural air into the suction pipeline. It can simultaneously realize the dual air supply of the air supply of the fan to the burner and the natural air supply of natural entrainment, thereby effectively increasing the primary air coefficient, promoting the combustion efficiency of the gas and increasing the flame temperature, which is beneficial to improving the thermal efficiency of the air blowing burner.

[0052] Optionally, the air blowing assembly 2 further includes: a gas channel 21 and an air channel 22; the air channel 22 is communicated with the air flow outlet B1, and the air flow inlet B2 of the air channel 22 is communicated with the air outlet of the blower 3; the gas channel 21 is communicated with the gas flow outlet A1, and the gas flow inlet A2 of the gas channel 21 is communicated with a gas supply device (not shown in the figure); the gas channel 21 and the air channel 22 are isolated from each other.

[0053] Specifically, the air flow inlet B2 and the air flow outlet B1 can be located on opposite sides of the air channel 22. When the blower 3 operates, the blown air can be provided to the suction pipeline 12 successively through the air flow inlet B2, the air channel 22 and the air flow outlet B1. The gas flow inlet A2 and the gas flow outlet A1 can be located on the same side of the air blowing assembly 2, and the gas flow inlet A2 and the gas flow outlet A1 are communicated through the gas channel 21. The gas channel 21 and the air channel 22 can be isolated from each other to prevent the gas and air from mixing inside the air blowing assembly 2, thereby avoiding safety accidents.

[0054] Optionally, the width of the gap is D; 2mm ≤ D ≤ 12mm.

[0055] Specifically, setting the width D of the gap between the air inlet C1 of the suction pipeline 12 and the air flow outlet B1 within the range of 2mm to 12mm can make the range of the air domain H0 left at the position of the air inlet C1 of the suction pipeline 12 larger, and the range of the area for natural entrainment of air larger, so as to be able to provide sufficient natural entrained air to the burner assembly 1.

[0056] In a preferred embodiment, the width D of the gap = 8.5mm. After testing, when the gap D between the air inlet C1 of the suction pipeline 12 and the air flow outlet B1 is set to 8.5mm, the primary air coefficient can be increased by 3% to 5%.

[0057] Optionally, Figure 7 is a schematic structural diagram of another burner assembly provided by an embodiment of the present invention. With reference to Figure 2 、 Figure 4 、 Figure 5 and Figure 7 , the burner body 11 includes an inner-ring burner 111 and an outer-ring burner 112; the suction pipeline 12 in the burner assembly 1 includes an inner-ring suction pipeline 121 and an outer-ring suction pipeline 122; the air outlet C21 of the inner-ring suction pipeline 121 is connected to the inner-ring burner 111, and the air outlet C22 of the outer-ring suction pipeline 122 is connected to the outer-ring burner 112. In this way, the air blowing assembly 2 can supply air and gas to the inner-ring burner 111 through the inner-ring suction pipeline 121 and supply air and gas to the outer-ring burner 112 through the outer-ring suction pipeline 122.

[0058] Exemplarily, the inner ring air intake pipe 121 may include an inner ring air intake diffuser pipe 1211, an inner ring air intake mixing pipe 1212, and an inner ring air intake contraction pipe 1213. Along the direction from the air inlet C11 to the air outlet C21 of the inner ring air intake pipe 121, the inner ring air intake contraction pipe 1213, the inner ring air intake mixing pipe 1212, and the inner ring air intake diffuser pipe 1211 are connected in sequence. Then, the fuel gas and air provided by the blower assembly 2 can be sequentially provided to the inner ring burner 111 through the inner ring air intake contraction pipe 1213, the inner ring air intake mixing pipe 1212, and the inner ring air intake diffuser pipe 1211 (as Figure 7 shown). Similarly, the outer ring air intake pipe 122 may include an outer ring air intake diffuser pipe 1221, an outer ring air intake mixing pipe 1222, and an outer ring air intake contraction pipe 1223. Along the direction from the air inlet C12 to the air outlet C22 of the outer ring air intake pipe 122, the outer ring air intake contraction pipe 1223, the outer ring air intake mixing pipe 1222, and the outer ring air intake diffuser pipe 1221 are connected in sequence. Then, the fuel gas and air provided by the blower assembly 2 can be sequentially provided to the outer ring burner 112 through the outer ring air intake contraction pipe 1223, the outer ring air intake mixing pipe 1222, and the outer ring air intake diffuser pipe 1221.

[0059] Optionally, the fuel gas flow outlet A1 includes an inner ring fuel gas flow outlet A11 and an outer ring fuel gas flow outlet A12; the air flow outlet B1 includes at least one inner ring air flow outlet B11 and at least one outer ring air flow outlet B12; each inner ring air flow outlet B11 and the inner ring fuel gas flow outlet A11 are oppositely arranged with respect to the air inlet C11 of the inner ring air intake pipe 121; each outer ring air flow outlet B12 and the outer ring fuel gas flow outlet A12 are oppositely arranged with respect to the air inlet C12 of the outer ring air intake pipe 122.

[0060] Specifically, the inner ring air flow outlet B11 may be arranged on the outer periphery of the inner ring fuel gas flow outlet A11, and the inner ring air flow outlet B11 is adjacent to the inner ring fuel gas flow outlet A11. In this way, both the inner ring air flow outlet B11 and the inner ring fuel gas flow outlet A11 can be oppositely arranged with respect to the air inlet C11 of the inner ring air intake pipe 121, so that the inner ring air flow outlet B11 can provide air into the inner ring air intake pipe 121, and the inner ring fuel gas flow outlet A11 can provide fuel gas into the inner ring air intake pipe 121. Similarly, the outer ring air flow outlet B12 may be arranged on the outer periphery of the outer ring fuel gas flow outlet A12, and the outer ring air flow outlet B12 is adjacent to the outer ring fuel gas flow outlet A12. In this way, both the outer ring air flow outlet B12 and the outer ring fuel gas flow outlet A12 can be oppositely arranged with respect to the air inlet C12 of the outer ring air intake pipe 122, so that the outer ring air flow outlet B12 can provide air into the outer ring air intake pipe 122, and the outer ring fuel gas flow outlet A12 can provide fuel gas into the outer ring air intake pipe 122.

[0061] Exemplarily, the gas flow inlet A2 may include an inner-ring gas flow inlet A21 and an outer-ring gas flow inlet A22. The gas channel 21 may correspondingly include an inner-ring gas channel 211 and an outer-ring gas channel 212. The inner-ring gas flow inlet A21 can be communicated with the inner-ring gas flow outlet A11 through the inner-ring gas channel 211, and the outer-ring gas flow inlet A22 can be communicated with the outer-ring gas flow outlet A12 through the outer-ring gas channel 212, so as to be able to supply gas to the inner-ring burner 111 and the outer-ring burner 112 respectively, and perform independent firepower control on the inner-ring burner 111 and the outer-ring burner 112.

[0062] Exemplarily, the flow area of the outer-ring air flow outlet B12 is S1, and the flow area of the inner-ring air flow outlet B11 is S2; 1.1 ≤ S1 / S2 ≤ 6.25. Setting the flow area S1 of the outer-ring air flow outlet B12 to be 1.1 to 6.25 times the flow area S2 of the inner-ring air flow outlet B11 can make the amount of primary air supplied to the inner-ring burner 111 match the amount of gas, and make the amount of primary air and the amount of gas supplied to the outer-ring burner 112 match, which can increase the primary air coefficient, thereby significantly improving the combustion efficiency and flame temperature of the gas, and being beneficial to improving the thermal efficiency of the cooker.

[0063] In a preferred embodiment, S1 / S2 = 2.2. After testing, when the ratio of the flow area S1 of the outer-ring gas flow outlet B12 to the flow area S2 of the inner-ring air flow outlet B11 is set to 2.2, the gas efficiency of the gas can be increased by 3% - 5%, and the effect of improving the thermal efficiency of the cooker can be effectively achieved.

[0064] Among them, the diameters of the inner-ring gas flow outlet A11 and the outer-ring gas flow outlet A12 can be the same.

[0065] Optionally, the flow area of the outer-ring air flow outlet B12 is S1, and the flow area of the air inlet C12 of the outer-ring air suction pipe 122 is S3; 0.0075 ≤ S1 / S3 ≤ 0.05. Setting the ratio of the flow area S1 of the outer-ring air flow outlet B12 to the flow area S3 of the air inlet C12 of the outer-ring air suction pipe 122 to be 0.0075 - 0.05, this size setting can prevent the flow area of the outer-ring air flow outlet B12 from being too small or too large, ensuring that the air volume and air velocity provided by the air blowing assembly 2 to the burner body 11 are not too small, and enabling the sufficient mixing of the gas, the primary blown air (i.e., the primary blown air provided by the air blowing assembly 2) and the primary natural air drawn naturally provided to the outer-ring burner 112, thereby promoting the full combustion of the gas and improving the flame temperature and the thermal efficiency of the cooker.

[0066] In a preferred embodiment, S1 / S3 can be set to 0.009. After testing, when the ratio of the flow area S1 of the outer ring air flow outlet B12 to the flow area S3 of the air inlet C12 of the outer ring suction pipe 122 is 0.009, the gas efficiency of the gas can be increased by 3% - 5%, and the effect of improving the thermal efficiency of the cooker can be effectively achieved.

[0067] Exemplarily, the flow area of the air inlet C11 of the inner ring suction pipe 121 is S4, and the ratio of the flow area S2 of the inner ring air flow outlet B11 to the flow area S4 of the air inlet C11 of the inner ring suction pipe 121 can be set to 0.0075 - 0.05, that is, 0.0075 ≤ S2 / S4 ≤ 0.05, so as to enable the sufficient mixing of the gas, the primary blast air (i.e., the primary blast air provided by the blast assembly 2) and the primary natural air naturally entrained into the inner ring burner 111, thereby promoting the sufficient combustion of the gas and improving the flame temperature and the thermal efficiency of the cooker.

[0068] In a preferred embodiment, S2 / S4 can be set to 0.009 to effectively achieve the effect of improving the thermal efficiency of the cooker.

[0069] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A blast burner, characterized in that: include: A burner assembly (1) and an air blast assembly (2); The burner assembly (1) comprises a burner body (11) and an air intake duct (12); The air blowing assembly (2) comprises a gas outlet (A1) and an air outlet (B1); The gas flow outlet (A1) and the air flow outlet (B1) are both located on a side of the air blowing assembly (2) facing the air intake duct (12); the air inlet (C1) of the air intake duct (12) is arranged opposite to the gas flow outlet (A1) and the air flow outlet (B1), and a gap is provided between the air inlet (C1) of the air intake duct (12) and the air flow outlet (B1); The air outlet (C2) of the air intake duct (12) is connected to the burner body (11).

2. The blast burner according to claim 1, characterized in that: The air blowing assembly (2) further comprises: a gas channel (21) and an air channel (22); The air passage (22) is in communication with the air outlet (B1), and the air inlet (B2) of the air passage (22) is in communication with the air outlet of the fan (3); The gas channel (21) is in communication with the gas outlet (A1), and the gas inlet (A2) of the gas channel (21) is in communication with a gas supply device; The gas passage (21) and the air passage (22) are isolated from each other.

3. The blast burner according to claim 1, characterized in that: The width of the gap is D; 2mm≤D≤12mm.

4. The blast burner according to claim 1, characterized in that: The width of the gap is D; D=8.5 mm.

5. The blast burner according to claim 1, characterized in that: The burner body (11) comprises an inner ring burner (111) and an outer ring burner (112); The air intake duct (12) in the burner assembly (1) comprises an inner ring air intake duct (121) and an outer ring air intake duct (122); The air outlet (C21) of the inner ring air intake duct (121) is connected to the inner ring burner (111), and the air outlet (C22) of the outer ring air intake duct (122) is connected to the outer ring burner (112).

6. The blast burner according to claim 5, characterized in that: The gas flow outlet (A1) comprises an inner ring gas flow outlet (A11) and an outer ring gas flow outlet (A12); The air outlet (B1) includes at least one inner ring air outlet (B11) and at least one outer ring air outlet (B12); Each of the inner ring air outlet (B11) and the inner ring gas outlet (A11) is arranged opposite to the air inlet (C11) of the inner ring air intake duct (121); Each of the outer ring air outlets (B12) and the outer ring gas outlets (A12) is arranged opposite to the air inlet (C12) of the outer ring air intake duct (122).

7. The blast burner according to claim 6, characterized in that: The flow area of ​​the outer ring air outlet (B12) is S1, and the flow area of ​​the inner ring air outlet (B11) is S2; 1.1≤S1 / S2≤6.

25.

8. The blast burner according to claim 7, characterized in that: S1 / S2=2.

2.

9. The blast burner according to claim 6, characterized in that: The flow area of ​​the outer ring air outlet (B12) is S1, and the flow area of ​​the air inlet (C12) of the outer ring air intake duct (122) is S3; 0.0075≤S1 / S3≤0.

05.

10. The blast burner according to claim 9, characterized in that: S1 / S3=0.009.

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