Combustor

Abstract

The utility model provides a burner which comprises a base and a gas mixing chamber, the base is provided with an outer ring channel corresponding to an outer ring injection pipe, the outer ring channel is communicated with the outer ring injection pipe, at least part of the outer ring channel is located under the base, and the base further comprises a first expansion channel and a second expansion channel. The outer ring channel communicates with the gas mixing chamber through a first expansion channel and a second expansion channel in sequence, and the first expansion channel extends to the lower portion of the outer side of the gas mixing chamber from the position under the gas mixing chamber in the first direction away from the center of the combustor. The second expansion channel extends to the position under the gas mixing chamber from the position under the outer side of the gas mixing chamber in the second direction close to the center of the combustor, and the second direction is tangent to a gas channel in the gas mixing chamber. The burner further comprises a flow guide part, the flow guide part is arranged at the joint of the first expansion channel and the second expansion channel, and the flow guide part is used for changing the flowing direction of fuel gas flowing in the first direction into the flowing direction of the fuel gas flowing in the second direction.

Description

Technical Field

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

[0002] Three-ring burners are favored by users due to their versatile heat output configurations, catering to diverse cooking needs. Existing three-ring burners feature three ejector tubes connected to a base, where the base diameter is slightly larger than the maximum distance between the three ejector tubes perpendicular to their axes. The burner diameter is also relatively large, generally exceeding the maximum distance between the three ejector tubes perpendicular to their axes. This increases burner costs, reduces the cooktop cavity space, and leads to higher internal cooktop temperatures.

[0003] To ensure a reasonable allocation of space within the cooktop cavity, allowing for the installation of a three-ring burner, the diameter of the base corresponding to the injector tube is typically reduced. However, in actual use, it has been found that the reduced base size, due to the three-ring structure, results in a relatively complex gas flow channel arrangement within the limited base size, leading to greater gas outlet resistance. This, in turn, causes uneven gas flow velocities at the outlets on both sides (middle and outer rings), resulting in uneven flames. Furthermore, the relatively complex burner structure and smaller base cavity volume result in weaker mixing and less uniform gas mixing, leading to a poor user experience. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of large changes in the outlet gas velocity and uneven gas output and mixing after the base is miniaturized in the prior art, and to provide a burner.

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

[0006] A burner includes a base and a mixing chamber. The base has a communicating outer ring channel corresponding to an outer ring ejector tube. At least a portion of the outer ring channel is located directly below the base. The base also includes a first expansion channel and a second expansion channel. The outer ring channel communicates with the mixing chamber sequentially through the first expansion channel and the second expansion channel. The first expansion channel extends from directly below the mixing chamber along a first direction away from the center of the burner to the lower outer side of the mixing chamber. The second expansion channel extends from the lower outer side of the mixing chamber along a second direction close to the center of the burner to directly below the mixing chamber. The second direction is tangent to a gas passage within the mixing chamber.

[0007] The burner also includes a flow guide, which is disposed at the connection between the first expansion channel and the second expansion channel. The flow guide is used to change the flow direction of the gas flowing in the first direction to flow in the second direction.

[0008] In this design, by setting up a first expansion channel and a second expansion channel, the distance for the gas to enter the mixing chamber from the outer ring channel is extended without increasing the width of the base. This increases the gas mixing time, effectively increasing the diameter at the connection between the outer ring injector and the outer ring channel. Compared to reducing the base diameter for easier installation into the cooktop cavity, this avoids the situation where the gas inlet to the outer ring channel is drastically reduced due to base size limitations, resulting in high gas resistance and a sharp decrease in gas flow velocity. This prevents uneven gas flow into the mixing chamber caused by large gradients in gas flow velocity, thus ensuring thorough mixing. Furthermore, by setting up a guide section to redirect the gas flowing in the first direction to the second direction, pre-mixing occurs when the gas changes direction before entering the mixing chamber. With minimal resistance to gas flow from the guide section, large velocity differences are avoided, allowing the pre-mixed gas to smoothly enter the mixing chamber for thorough mixing and overcoming the problem of inconsistent flame height during combustion.

[0009] Preferably, the guide portion includes a guide surface, the cross-section of which is an arc-shaped structure, wherein the dimension of the first end of the guide surface facing the first direction is greater than the dimension of the second end of the guide surface facing the second direction.

[0010] In this solution, the above-mentioned configuration ensures that the opening of the arc-shaped structure faces the center of the burner, thereby enabling the gas to be smoothly diverted and avoiding an increase in gas flow resistance.

[0011] Preferably, the flow guide further includes an impact surface, which is disposed at the end of the outer ring channel away from the outer ring ejector tube. The impact surface is flat and flush with the inner wall of the gas passage in the mixing chamber.

[0012] In this scheme, the above settings ensure that the gas flow rate is guaranteed and that the gas that has changed direction can quickly flow into the mixing chamber.

[0013] Preferably, one end of the first expansion channel is used to communicate with the outer ring channel, and the size of the first expansion channel is the same as the size of the outer ring channel.

[0014] In this scheme, the above settings ensure that the gas flow rate is not obstructed when the gas enters the first expansion channel, that is, the gas flow rate does not change significantly, thus reducing interference with the gas flow rate.

[0015] Preferably, the first expansion channel and the second expansion channel are integrally formed, and the cross-sections of the first expansion channel and the second expansion channel are L-shaped.

[0016] In this solution, the gas flow direction is changed through the above settings.

[0017] Preferably, the first expansion channel further includes a flow stabilizing section, which extends along the first direction and is located in the middle region of the first expansion channel. The flow stabilizing section and the flow guiding section are spaced apart.

[0018] In this scheme, the above-mentioned arrangement allows the gas in the first expansion channel to be separated by the flow stabilizing section. Based on the spacing between the flow stabilizing section and the flow guiding section, the separated gas can re-contact and mix between the flow stabilizing section and the flow guiding section, i.e., pre-mixing, thereby improving the uniformity of gas mixing.

[0019] Preferably, the current stabilizing section extends from the lower end of the first expansion channel to the upper end of the first expansion channel.

[0020] In this solution, the above settings effectively separate the gas, avoiding the situation where some gas cannot be separated and therefore cannot be premixed.

[0021] Preferably, the burner further includes a flow divider, which is disposed at the outlet of the outer ring channel for communicating with the mixing chamber. The gas flow velocity at the first end of the outlet of the outer ring channel is greater than the gas flow velocity at the second end, and the flow divider is disposed near the first end of the outlet.

[0022] In this scheme, the above settings are used to balance the gas flow rate at the outlet of the outer ring channel, thereby reducing the gas flow rate difference between the first and second ends, so that the gas can be fully mixed when it enters the mixing chamber, thus improving uniformity.

[0023] Preferably, the flow divider includes a flow divider surface, which is arranged in the direction of the outlet gas of the outer ring channel, and the flow divider surface is inclined towards the second end of the outlet along the height direction of the burner.

[0024] In this scheme, the above settings are used to achieve balanced regulation of the gas flow rate at the first and second ends of the outer ring channel outlet.

[0025] Preferably, the base is provided with a central ring ejector tube and a central ring channel connected to the central ring ejector tube. The outlet of the central ring channel is connected to the mixing chamber and the outlet of the central ring channel is close to the outer edge of the mixing chamber. The outlet of the outer ring channel is located close to the axis of the mixing chamber. The mixing chamber includes a sealing plate. The sealing plate is provided with a recessed portion facing the axis of the burner corresponding to the outlet of the central ring channel. The recessed portion is located on the side of the outlet of the outer ring channel.

[0026] In this scheme, the above settings facilitate processing and ensure smoother gas flow at the outlet of the outer ring channel without increasing the diameter of the mixing chamber.

[0027] The positive and progressive effects of this invention are as follows: By setting up a first expansion channel and a second expansion channel, this invention extends the distance for the gas to enter the mixing chamber from the outer ring channel without increasing the width of the base, thereby increasing the gas mixing time. This is equivalent to indirectly increasing the diameter of the connection between the outer ring injector and the outer ring channel. Compared to reducing the base diameter for easier installation into the stove cavity, this avoids the situation where the gas inlet to the outer ring channel is drastically reduced due to base size limitations, resulting in high gas resistance and a sharp decrease in gas flow velocity. In other words, it prevents uneven gas flow into the mixing chamber caused by large gradients in gas flow velocity, thus ensuring thorough gas mixing. In addition, by setting up a guide section to change the gas flow from the first direction to the second direction, premixing the gas before it enters the mixing chamber is possible when the flow direction is changed. Furthermore, with the guide section providing low resistance to gas flow, it avoids large velocity differences in the gas, allowing the premixed gas to smoothly enter the mixing chamber for thorough mixing and overcoming the problem of inconsistent flame height during combustion. Attached Figure Description

[0028] Figure 1 This is a perspective view of a burner according to a preferred embodiment of the present invention.

[0029] Figure 2 This diagram shows the positional relationship between the flow guide and the outer ring channel in a preferred embodiment of the present invention.

[0030] Figure 3 for Figure 2 Sectional view of AA.

[0031] Figure 4 This is a diagram showing the positional relationship between the outer ring channel and the middle ring channel in a preferred embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the sealing plate according to a preferred embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] First expansion channel 1

[0035] Second expansion channel 2

[0036] Flow guide 3

[0037] Base 10

[0038] Mixing chamber 20

[0039] Sealing plate 21

[0040] Recess 211

[0041] Outer ring ejector tube 30

[0042] Outer Ring Road 31

[0043] Export 311

[0044] Guide surface 32

[0045] Impact surface 33

[0046] Flow stabilizer 4

[0047] 40mm central ring ejector tube

[0048] Central Link 41

[0049] First direction A

[0050] Second direction B Detailed Implementation

[0051] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0052] This embodiment provides a burner, the specific structure of which is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the burner includes a base 10 and a mixing chamber 20. The base 10 is provided with an outer ring channel 31 corresponding to the outer ring ejector tube 30. At least a portion of the outer ring channel 31 is located directly below the base 10. The base 10 also includes a first expansion channel 1 and a second expansion channel 2. The outer ring channel 31 is connected to the mixing chamber 20 in sequence through the first expansion channel 1 and the second expansion channel 2. The first expansion channel 1 extends from directly below the mixing chamber 20 along a first direction A away from the center of the burner to the lower outer side of the mixing chamber 20. The second expansion channel 2 extends from the lower outer side of the mixing chamber 20 along a second direction B close to the center of the burner to directly below the mixing chamber 20. The second direction B is tangent to the gas passage in the mixing chamber 20.

[0053] The burner also includes a flow guide 3, which is disposed at the connection between the first expansion channel 1 and the second expansion channel 2. The flow guide 3 is used to change the flow direction of the gas flowing along the first direction A to flow towards the second direction B.

[0054] Specifically, an outer ring channel 31 is provided on the base 10 corresponding to the outer ring ejector tube 30. One end of the outer ring channel 31 is coaxially arranged with the outer ring ejector tube 30, and the other end of the outer ring channel 31 is arranged around the axis of the base 10. The outer ring channel 31 is used to receive the gas from the outer ring ejector tube 30 and introduce the gas into the mixing chamber 20 for thorough mixing. This is existing technology and will not be described in detail here. In addition, this embodiment is provided with a first expansion channel 1 and a second expansion channel 2. One end of the first expansion channel 1 is connected to the outer ring channel 31 near the area of ​​the outer ring ejector tube 30, and the other end of the first expansion channel 1 is connected to the second expansion channel 2. The other end of the second expansion channel 2 is connected to the area of ​​the outer ring channel 31 away from the outer ring ejector tube 30. The area of ​​the outer ring channel 31 away from the outer ring ejector tube 30 is connected to the mixing chamber 20 through the first expansion channel 1 and the second expansion channel 2. The first expansion channel 1 is coaxially arranged with the outer ring channel 31 near the area of ​​the outer ring ejector tube 30, and the first expansion channel 1 extends along the first direction A. From the cross-section, the first expansion channel 1 is tangent to the outer edge of the base 10 in the direction away from the center of the burner, which is equivalent to indirectly increasing the diameter of the connection between the outer ring ejector tube 30 and the outer ring channel 31. Compared with the outer ring channel 31 being directly connected to the mixing chamber 20, the additional first expansion channel 1 makes the gas stay for a longer time before entering the mixing chamber 20. Furthermore, without increasing the width of the outer ring channel 31, the width of the base 10 remains unchanged. This allows for a longer residence time of the gas before it enters the mixing chamber 20, increasing the gas mixing time and improving the mixing effect. It also reduces uneven mixing in the outer ring channel 31 region far from the outer ring injector 30. Compared to reducing the diameter of the base 10 for easier installation into the cooktop cavity, maintaining the same width allows for installation within the cooktop cavity. This prevents a sharp decrease in gas resistance and flow velocity due to the drastic reduction in the gas inlet of the outer ring channel 31 caused by the size limitation of the base 10. In other words, it prevents uneven gas flow into the mixing chamber 20 caused by large gradients in gas flow velocity in the areas of the outer ring channel 31 near and far from the outer ring injector 30, thus ensuring thorough gas mixing.

[0055] The second expansion channel 2 extends along the second direction B. In cross-section, the second expansion channel 2 is tangent to the gas passage in the mixing chamber 20 along the direction close to the center of the burner. This changes the gas flow direction while increasing the gas residence time in the first expansion channel 1, so that the gas both increases the mixing time and changes the flow direction, allowing them to fully contact each other before flowing into the mixing chamber 20. In particular, the gas on the side of the first expansion channel 1 away from the center of the burner and the gas on the side close to the center of the burner contact each other when changing the flow direction, thereby improving the mixing effect.

[0056] In addition, in this embodiment, a guide section 3 is additionally provided at the connection between the first expansion channel 1 and the second expansion channel 2. The guide section 3 is used to change the flow of gas flowing in the first direction A to flow in the second direction B. Compared with the connection between the first expansion channel 1 and the second expansion channel 2 changing the gas flow direction through its own inner wall, the guide section 3 makes the change of gas flow direction smoother, avoids the inner wall of the connection between the first expansion channel 1 and the second expansion channel 2 forming resistance to the gas flow, and prevents uneven gas mixing caused by low local gas flow velocity. By setting the guide section 3, the gas can be premixed when changing the flow direction before entering the mixing chamber 20. And with the guide section 3 having low resistance to gas flow, it avoids large flow velocity differences of gas, so that the premixed gas can smoothly enter the mixing chamber 20 for full mixing, overcoming the problem of inconsistent flame height during combustion.

[0057] like Figure 3 As shown, in this embodiment, the flow guide 3 includes a flow guide surface 32, the cross-section of which is an arc-shaped structure, wherein the dimension of the first end of the flow guide surface 32 facing the first direction A is greater than the dimension of the second end of the flow guide surface 32 facing the second direction B.

[0058] Specifically, the guide surface 32 is located at the connection between the first expansion channel 1 and the second expansion channel 2, with its arc-shaped opening facing the first direction A. The first end of the guide surface 32 faces the first expansion channel 1, and the second end faces the second expansion channel 2. The first end of the guide surface 32 is used to contact the gas in the first expansion channel 1, changing the gas flow direction through its arc-shaped surface, causing the gas to flow from the first direction A to the second direction B and finally into the mixing chamber 20. It can be understood that, compared to other shapes in the prior art, the arc-shaped cross-section of the guide surface 32 can prevent abrupt changes in gas flow velocity and ensure a relatively high gas flow velocity, thus avoiding increased gas flow resistance.

[0059] Furthermore, in this embodiment, the flow guide 3 also includes an impact surface 33, which is disposed at the end of the outer ring channel 31 away from the outer ring ejector tube 30. The surface of the impact surface 33 is flat and flush with the inner wall of the gas passage in the mixing chamber 20.

[0060] Specifically, the impact surface 33 is located within the outer ring channel 31 and at the end of the outer ring channel 31 furthest from the outer ring ejector tube 30. The surface of the impact surface 33 is flat along the burner height direction. Viewed along the burner height direction, the inner wall of the gas passage in the mixing chamber 20 and the impact surface 33 are on the same plane. This facilitates smoother gas flow through the guiding impact surface 33. By setting the impact surface 33 as a flat surface and flush with the inner wall of the gas passage in the mixing chamber 20, the gas flows from the first expansion channel 1 into the second expansion channel 2 along the first direction A, and changes its flow direction to the second direction B through the guiding surface 32. When the gas flows into the mixing chamber 20 through the impact surface 33 in the outer ring channel 31, the gas velocity does not decrease significantly. In particular, it reduces the situation where there is a large difference in the gas velocity gradient between the area near the outer ring ejector tube 30 and the area far from the outer ring ejector tube 30.

[0061] In this embodiment, one end of the first expansion channel 1 is used to communicate with the outer ring channel 31, and the size of the first expansion channel 1 is the same as the size of the outer ring channel 31.

[0062] Specifically, the diameter of the first expansion channel 1 is the same as the diameter of the outer ring channel 31. Looking along the width direction of the burner, the additional first expansion channel 1 will not increase the width of the base 10. On the one hand, this ensures that the gas flow rate will not be obstructed due to the change in the channel diameter when the gas enters the first expansion channel 1, that is, the gas flow rate will not change significantly, reducing interference with the gas flow rate. On the other hand, it facilitates the installation of the burner, especially the base 10, into the stove cavity, preventing the situation where the burner cannot be installed into the stove cavity when the diameter of the outer ring channel 31 is increased to improve the gas mixing effect.

[0063] In this embodiment, the first expansion channel 1 and the second expansion channel 2 are integrally formed, and the cross-sections of the first expansion channel 1 and the second expansion channel 2 are L-shaped.

[0064] Specifically, the diameter of the end of the second expansion channel 2 that connects to the first expansion channel 1 is the same as the diameter of the first expansion channel 1, to avoid obstruction of the channel due to the change in diameter during gas flow. The first direction A and the second direction B are perpendicular to each other, that is, the first expansion channel 1 and the second expansion channel 2 are set perpendicularly, thus forming an L-shaped structure. Compared with other angles, when the gas flows in the first expansion channel 1 and the second expansion channel 2, the flow direction changes significantly, the gas contacts fully, and the mixing effect is better.

[0065] Of course, in other embodiments, the first expansion channel 1 and the second expansion channel 2 may be at other angles, such as 80°, in order to effectively change the gas flow direction, which will not be elaborated on here.

[0066] In this embodiment, the first expansion channel 1 also includes a flow stabilizing part 4, which extends along the first direction A and is located in the middle region of the first expansion channel 1. The flow stabilizing part 4 and the flow guiding part 3 are spaced apart.

[0067] Specifically, the flow stabilizer 4 is arranged along the first direction A. The flow stabilizer 4 is used to separate the gas in the first expansion channel 1, so as to form an inner gas near the center of the burner and an outer gas near the center of the burner in the first expansion channel 1. The inner gas and the outer gas flow along the first expansion channel 1 toward the second expansion channel 2. In the flow path, the flow stabilizer 4 and the guide 3 are arranged at intervals. When the separated inner gas and outer gas change their flow direction through the guide 3, the outer gas flows to the inner gas in the gap between the flow stabilizer 4 and the guide 3. The two come into full contact and mix, that is, they are fully mixed when they flow into the area of ​​the outer ring channel 31 away from the outer ring ejector 30 and into the mixing chamber 20. This is also called premixing, thereby improving the uniformity of gas mixing.

[0068] In this embodiment, the flow stabilizing part 4 is a plate, extending from the lower end of the first expansion channel 1 to the upper end of the first expansion channel 1. That is, along the burner height direction, the flow stabilizing part 4 forms two semi-circular channels in a portion of the first expansion channel 1 to effectively separate the gas and avoid the situation where some gas cannot be separated and therefore cannot be premixed.

[0069] In this embodiment, the burner also includes a flow divider (not shown in the figure). The flow divider is located at the outlet 311 of the outer ring channel 31 for communicating with the mixing chamber 20. The gas flow velocity at the first end of the outlet 311 of the outer ring channel 31 is greater than the gas flow velocity at the second end. The flow divider is located near the first end of the outlet 311.

[0070] Specifically, there are two outlets 311, one located near the outer ring ejector tube 30 and the other located away from it. Because the first and second ends of outlet 311 are at different distances from the outer ring ejector tube 30, the gas velocity at the first end of outlet 311 is greater than that at the second end. A flow divider is provided within outlet 311 to balance the gas velocity at outlet 311, thereby reducing the velocity difference between the first and second ends. This ensures thorough mixing of the gas when it enters the mixing chamber 20, improving uniformity. The flow divider can be a plate as in the prior art, or other structures used to block the gas to balance its velocity; details will not be elaborated upon here.

[0071] In this embodiment, the flow divider includes a flow divider surface, which is arranged in the direction of the gas outlet 311 of the outer ring channel 31. The flow divider surface is inclined towards the second end of the outlet 311 along the height direction of the burner.

[0072] Specifically, the cross-section of the flow divider is a right-angled triangle structure, where one side of the right angle is perpendicular to the height direction of the burner, and the other side is in the same direction as the height direction of the burner. The hypotenuse is the flow divider surface, which is set in the direction of the gas outlet 311 of the outer ring channel 31. The flow divider surface is inclined towards the second end of the outlet 311 along the height direction of the burner, so that when the gas passes through the flow divider surface, the gas flow velocity towards the second end increases, thereby achieving a balanced adjustment of the gas flow velocity at the first and second ends of the outlet 311 of the outer ring channel 31.

[0073] In this embodiment, the base 10 is provided with a central ring ejector tube 40 and a central ring channel 41 connected to the central ring ejector tube 40. The outlet of the central ring channel 41 is connected to the mixing chamber 20 and the outlet of the central ring channel 41 is located at the outer edge of the mixing chamber 20. The outlet 311 of the outer ring channel 31 is located near the axis of the mixing chamber 20. The mixing chamber 20 includes a sealing plate 21. The sealing plate 21 is provided with a recess 211 facing the axis of the burner corresponding to the outlet of the central ring channel 41. The recess 211 is located on the side of the outlet 311 of the outer ring channel 31.

[0074] Specifically, the sealing plate 21 is installed on the base 10. A gas port is provided on the sealing plate 21 corresponding to the outer ring channel 31. The gas port is located on the sealing plate 21 near the axis of the mixing chamber 20. A gas port is also provided on the sealing plate 21 corresponding to the middle ring channel 41. The gas port corresponding to the middle ring channel 41 is located near the outer edge of the mixing chamber 20. Compared with the existing structure, where the outlet 311 of the outer ring channel 31 is close to the outer edge of the mixing chamber 20 and the outlet of the middle ring channel 41 is close to the axis of the mixing chamber 20, the path radius of the gas flowing from the outer ring channel 31 into the mixing chamber 20 is reduced, so as to ensure that the gas flow rate is faster and smoother. It is understandable that the sealing plate 21 is provided with a recess 211 at the outlet of the middle ring channel 41. The middle ring channel 41 is connected to the mixing chamber 20 near the outer edge area through the recess 211. By providing the recess 211, it is convenient to process, and on the other hand, without increasing the diameter of the mixing chamber 20, the location of the outlet 311 of the outer ring channel 31 near the axis of the mixing chamber 20 will not affect the flow rate of the gas in the middle ring channel 41, ensuring smoother gas flow at the outlet of the middle ring channel 41 and the outlet 311 of the outer ring channel 31.

[0075] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A burner, the burner comprising a base and a mixing chamber, the base having a communicating outer annular channel corresponding to an outer annular ejector tube, at least a portion of the outer annular channel being located directly below the base, characterized in that, The base also includes a first expansion channel and a second expansion channel. The outer ring channel communicates with the mixing chamber through the first expansion channel and the second expansion channel in sequence. The first expansion channel extends from directly below the mixing chamber along a first direction away from the center of the burner to the lower outer side of the mixing chamber. The second expansion channel extends from the lower outer side of the mixing chamber along a second direction close to the center of the burner to directly below the mixing chamber. The second direction is tangent to the gas passage in the mixing chamber. The burner also includes a flow guide, which is disposed at the connection between the first expansion channel and the second expansion channel. The flow guide is used to change the flow direction of the gas flowing in the first direction to flow in the second direction.

2. The burner as claimed in claim 1, characterized in that, The flow guiding part includes a flow guiding surface, the cross-section of which is an arc-shaped structure, wherein the dimension of the first end of the flow guiding surface facing the first direction is greater than the dimension of the second end of the flow guiding surface facing the second direction.

3. The burner as described in claim 2, characterized in that, The flow guide also includes an impact surface, which is located at the end of the outer ring channel away from the outer ring ejector tube. The impact surface is flat and flush with the inner wall of the gas passage in the mixing chamber.

4. The burner as claimed in claim 1, characterized in that, One end of the first expansion channel is used to communicate with the outer ring channel, and the size of the first expansion channel is the same as the size of the outer ring channel.

5. The burner as described in claim 4, characterized in that, The first expansion channel and the second expansion channel are integrally formed, and the cross-sections of the first expansion channel and the second expansion channel are L-shaped.

6. The burner as described in claim 5, characterized in that, The first expansion channel also includes a flow stabilizing section, which extends along the first direction and is located in the middle region of the first expansion channel. The flow stabilizing section and the flow guiding section are spaced apart.

7. The burner as claimed in claim 6, characterized in that, The current stabilizing section extends from the lower end of the first expansion channel to the upper end of the first expansion channel.

8. The burner as claimed in claim 1, characterized in that, The burner also includes a flow divider, which is located at the outlet of the outer ring channel for communicating with the mixing chamber. The gas velocity at the first end of the outlet of the outer ring channel is greater than the gas velocity at the second end, and the flow divider is located near the first end of the outlet.

9. The burner as claimed in claim 8, characterized in that, The flow divider includes a flow divider surface, which is arranged in the direction of the outlet gas of the outer ring channel, and the flow divider surface is inclined towards the second end of the outlet along the height direction of the burner.

10. The burner as claimed in claim 1, characterized in that, The base is provided with a central ring ejector tube and a central ring channel connected to the central ring ejector tube. The outlet of the central ring channel is connected to the mixing chamber and the outlet of the central ring channel is close to the outer edge of the mixing chamber. The outlet of the outer ring channel is located close to the axis of the mixing chamber. The mixing chamber includes a sealing plate. The sealing plate is provided with a recessed portion facing the axis of the burner corresponding to the outlet of the central ring channel. The recessed portion is located on the side of the outlet of the outer ring channel.

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