Burner structure, burner and gas stove

Abstract

The utility model relates to the technical field of kitchen appliances, and particularly discloses a furnace end structure, a burner and a gas stove. According to the furnace end structure and the combustor, the outer mixing cavity formed in the furnace end body is divided into the outer mixing inner cavity and the outer mixing outer cavity, the outer mixing inner cavity is divided into the first outer mixing inner cavity and the second outer mixing inner cavity, and the two outer ring injection pipes extend into the first outer mixing inner cavity and the second outer mixing inner cavity respectively; compared with the prior art, the injection length of the burner is increased, the injection performance of the burner is improved, meanwhile, the first outer mixing inner cavity and the second outer mixing inner cavity are arranged, two streams of airflow are divided to be subjected to gas mixing in the different outer mixing inner cavities, secondary mixing of gas and air is achieved, the gas and the air are mixed more evenly, and the combustion efficiency of the burner is improved. It is guaranteed that gas firstly enters different outer mixing inner cavities to be fully mixed with air, then flows into an outer mixing outer cavity in a split-flow mode, and then is exhausted through fire holes of the outer fire cover to be combusted, and gas is combusted more fully.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a burner head structure, a burner and a gas stove. Background Art

[0002] With the continuous development of the kitchen appliance market, the proportion of integrated stoves in the market has been increasing year by year. The upper-air inlet burner in the integrated stove is widely used, which can not only prevent gas leakage and avoid the disadvantage of insufficient primary air supplement, but also has the characteristics of easy cleaning and easy maintenance.

[0003] However, due to size limitations, the upper-air inlet burner in the prior art has relatively poor ejector performance and cannot improve the power of the burner. Currently, the deficiency caused by the short ejector distance is usually compensated by increasing the number of nozzles. However, the increase in the number of nozzles also requires higher processing technology, resulting in lower production efficiency and increased costs. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a burner head structure, a burner and a gas stove, which effectively improve the ejector performance of the outer ring ejector pipe, improve the uniformity of the gas-air mixture, and enable the gas to be fully burned.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, a burner head structure is provided, including:

[0007] A burner head body, on which an outer mixing chamber is provided. The outer mixing chamber includes a connected inner outer mixing chamber and an outer outer mixing chamber. A first partition plate is provided in the inner outer mixing chamber, and the inner outer mixing chamber is divided into a first inner outer mixing chamber and a second inner outer mixing chamber;

[0008] Two outer ring ejector pipes, which are respectively connected to the burner head body. The first end of the first outer ring ejector pipe passes through the outer wall of the outer ring of the first inner outer mixing chamber and is placed in the first inner outer mixing chamber. The first end of the second outer ring ejector pipe passes through the outer wall of the outer ring of the second inner outer mixing chamber and is placed in the second inner outer mixing chamber. The first ends of the two outer ring ejector pipes are respectively provided with air outlets.

[0009] As an optional technical solution of the above burner head structure, the air outlet is arranged towards the outer wall of the outer ring of the inner outer mixing chamber.

[0010] As an optional technical solution of the above burner head structure, the outer ring ejector pipe includes an air inlet part, a throat part and an ejector part connected in sequence, and a part of the ejector part is placed in the inner outer mixing chamber;

[0011] The air outlet is arranged at the end of the first end of the outer ring ejector tube, and the distance between each air outlet and the outer wall of the outer ring is L2, and d1 ≤ L2 ≤ 2d1;

[0012] wherein, d1 is the inner diameter of the throat.

[0013] As an alternative technical solution of the above burner head structure, the outer ring ejector tube includes an air inlet part, a throat and an ejector part connected in sequence, a part of the ejector part is placed in the outer mixing inner cavity, the length of the ejector part is L1, and L1 ≥ 3.8d1;

[0014] wherein, d1 is the inner diameter of the throat.

[0015] As an alternative technical solution of the above burner head structure, the outer mixing cavity includes a first part and a second part, the depth of the first part is greater than that of the second part, the first part is the outer mixing inner cavity, the orifice of the outer mixing inner cavity is covered with a flow dividing plate, and one side of the flow dividing plate abuts against the first partition plate, the flow dividing plate and the second part enclose to form the outer mixing outer cavity, both ends of the flow dividing plate extend to the connection part of the first part and the second part, and the flow dividing plate is spaced from the bottom wall at the connection part to respectively form a first side air outlet communicating the first outer mixing inner cavity and the outer mixing outer cavity, and a second side air outlet communicating the second outer mixing inner cavity and the outer mixing outer cavity.

[0016] As an alternative technical solution of the above burner head structure, one end of the flow dividing plate is connected to the outer wall of the outer ring of the outer mixing inner cavity, and the other end of the flow dividing plate is spaced from the inner wall of the outer ring of the outer mixing inner cavity to form an upper air outlet, and the upper air outlet communicates the first outer mixing inner cavity and the second outer mixing inner cavity with the outer mixing outer cavity respectively;

[0017] and / or, the flow dividing plate and the outer wall of the outer ring of the outer mixing inner cavity are of an integrally connected structure.

[0018] As an alternative technical solution of the above burner head structure, the width of the upper air outlet is greater than or equal to 3 mm.

[0019] As an alternative technical solution of the above burner head structure, a second partition plate is arranged on one side of the outer mixing outer cavity opposite to the outer mixing inner cavity.

[0020] In a second aspect, a burner is provided, which includes an outer fire cover and the burner head structure according to any one of the above, and the outer fire cover is covered on the outer mixing outer cavity.

[0021] In a third aspect, a gas stove is provided, which includes the above burner.

[0022] Advantages of the present utility model:

[0023] For the burner head structure and burner provided by the present utility model, the external mixing chamber provided on the burner head body is divided into an internal external mixing chamber and an external external mixing chamber. The internal external mixing chamber is divided into a first internal external mixing chamber and a second internal external mixing chamber. Two outer ring ejector tubes respectively extend into the first internal external mixing chamber and the second internal external mixing chamber, increasing the ejector length of the burner and improving the ejector performance of the burner. At the same time, the first internal external mixing chamber and the second internal external mixing chamber are provided, and the gas is mixed in two separate airflows in different internal external mixing chambers, realizing the secondary mixing of gas and air, making the mixing of gas and air more uniform. It ensures that the gas first enters different internal external mixing chambers to fully mix with air and then is split and flows into the external external mixing chamber, and then is discharged through the fire holes of the external fire cover covering the external external mixing chamber for combustion, making the gas burn more fully. Description of the drawings

[0024] Figure 1 is a cross-sectional view of the burner head body provided by an embodiment of the present utility model;

[0025] Figure 2 is a first cross-sectional view of the burner provided by an embodiment of the present utility model;

[0026] Figure 3 is an axonometric view of the burner head body provided by an embodiment of the present utility model;

[0027] Figure 4 is a second cross-sectional view of the burner provided by an embodiment of the present utility model.

[0028] In the figure:

[0029] 1, burner head body; 2, external mixing chamber; 3, outer ring ejector tube; 4, flow dividing plate; 5, first side air outlet; 6, second side air outlet; 7, upper air outlet; 8, internal mixing chamber; 9, inner ring ejector tube;

[0030] 11, burner head positioning groove; 12, burner head limiting groove;

[0031] 21, outer ring inner wall; 22, outer ring outer wall; 23, internal external mixing chamber; 231, first internal external mixing chamber; 232, second internal external mixing chamber; 24, external external mixing chamber; 25, first partition plate; 251, avoidance groove; 26, second partition plate; 27, first part; 28, second part; 29, connecting part;

[0032] 31, air outlet; 32, air inlet part; 33, throat; 34, ejector part;

[0033] 41, external fire cover limiting hole;

[0034] 81. Outer ring outer wall; 82. Inner ring inner wall; 83. Inner fire cover positioning block; 84. Thermocouple limit seat;

[0035] 100. Outer fire cover; 101. Outer fire cover positioning post; 200. Inner fire cover; 201. Inner fire cover positioning post; 300. Nozzle seat; 301. Burner head positioning post; 302. Burner head limit post; 303. Gas passage; 304. Gas inlet; 305. Fixed seat installation groove; 306. Fixed seat; 400. Outer ring nozzle; 500. Inner ring nozzle; 600. Thermocouple; 700. Dry - burning prevention probe. Detailed implementation mode

[0036] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0037] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0039] In the description of this embodiment, the terms such as "above", "below", "right", etc., regarding the orientation or position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] As Figure 1 and Figure 2 shown, this embodiment provides a burner head structure applied to the burner of a gas stove. The burner head structure includes a burner head body 1 and two outer ring ejector tubes 3. An outer mixing chamber 2 is provided on the burner head body 1. The outer mixing chamber 2 includes a connected inner outer mixing chamber 23 and an outer outer mixing chamber 24. A first partition plate 25 is provided in the inner outer mixing chamber 23, and the inner outer mixing chamber 23 is divided into a first inner outer mixing chamber 231 and a second inner outer mixing chamber 232. The two outer ring ejector tubes 3 are respectively connected to the burner head body 1. The first end of the first outer ring ejector tube 3 passes through the outer wall 21 of the outer ring of the first inner outer mixing chamber 231 and is placed in the first inner outer mixing chamber 231. The first end of the second outer ring ejector tube 3 passes through the outer wall 21 of the outer ring of the second inner outer mixing chamber 232 and is placed in the second inner outer mixing chamber 232. The first ends of the two outer ring ejector tubes 3 are respectively provided with air outlets 31.

[0041] The burner head structure provided in this embodiment divides the outer mixing chamber 2 provided on the burner head body 1 into an inner outer mixing chamber 23 and an outer outer mixing chamber 24. The inner outer mixing chamber 23 is divided into a first inner outer mixing chamber 231 and a second inner outer mixing chamber 232. The two outer ring ejector tubes 3 respectively extend into the first inner outer mixing chamber 231 and the second inner outer mixing chamber 232, increasing the ejector length of the burner and improving the ejector performance of the burner. At the same time, the first inner outer mixing chamber 231 and the second inner outer mixing chamber 232 are provided, and two airflows are divided to perform gas mixing in different inner outer mixing chambers 23, realizing the secondary mixing of gas and air, making the mixing of gas and air more uniform, ensuring that the gas first enters different inner outer mixing chambers 23 to fully mix with air and then is shunted to flow into the outer outer mixing chamber 24, and then is discharged through the fire holes of the outer fire cover covering the outer outer mixing chamber 24 for combustion, and the gas is burned more fully.

[0042] Optionally, the air outlet 31 is arranged facing the outer wall 22 of the outer ring of the inner outer mixing chamber 23, that is, the air outlet 31 of one outer ring ejector tube 3 is arranged facing the outer wall 22 of the outer ring of the first inner outer mixing chamber 231, and the air outlet 31 of the other outer ring ejector tube 3 is arranged facing the outer wall 22 of the outer ring of the second inner outer mixing chamber 232. The gas discharged through the air outlet 31 in the outer ring ejector tube 3 is directly ejected onto the outer wall 22. The outer wall 22 can slow down the flow rate of the air flow, and the outer wall 22 and the first partition plate 25 respectively play a guiding role in the air flow in the first inner outer mixing chamber 231 and the second inner outer mixing chamber 232, realizing the shunting of the gas in the first inner outer mixing chamber 231 and the gas in the second inner outer mixing chamber 232 to flow into the outer outer mixing chamber 24.

[0043] In some embodiments, the outer ring ejector tube 3 includes an air inlet portion 32, a throat portion 33, and an ejector portion 34 that are connected in sequence. A part of the ejector portion 34 is disposed in the outer mixing inner cavity 23. The air outlet 31 is provided at the end of the first end of the outer ring ejector tube 3. The distance between each air outlet 31 and the outer wall 22 of the outer ring is L2, and d1 ≤ L2 ≤ 2d1, where d1 is the inner diameter of the throat portion 33, and the inner diameter of the throat portion 33 is the same along its axial direction. With this distance setting, the air flow velocity of the outer ring ejector tube 3 entering the first outer mixing inner cavity 231 or the second outer mixing inner cavity 232 can be slowed down, preventing the occurrence of a flame detachment phenomenon in the burner. The air inlet portion 32 supplies gas and air, and in the air inlet portion 32, the gas and air are mixed for the first time, and then flow through the throat portion 33 and the ejector portion 34 in sequence and enter the first outer mixing inner cavity 231 or the second outer mixing cavity 232.

[0044] The length of the ejector portion 34 is L1, and L1 ≥ 3.8d1, where d1 is the inner diameter of the throat portion 33, so that the outer ring ejector tube 3 extends into the first outer mixing inner cavity 231 or the second outer mixing inner cavity 232, increasing the ejector length of the burner and ensuring the distance between the air outlet 31 of the outer ring ejector tube 3 and the outer wall 22 of the outer ring, and slowing down the air flow velocity of the outer ring ejector tube 3 entering the first outer mixing inner cavity 231 or the second outer mixing inner cavity 232.

[0045] As Figure 1 and Figure 3 shown, in some embodiments, the outer mixing cavity 2 includes a first part 27 and a second part 28. The depth of the first part 27 is greater than that of the second part 28. The first part 27 is the outer mixing inner cavity 23. The orifice of the outer mixing inner cavity 23 is covered with a flow dividing plate 4, and one side of the flow dividing plate 4 abuts against the first partition plate 25. The flow dividing plate 4 and the other part of the outer mixing cavity 2 enclose an outer mixing outer cavity 24. The two ends of the flow dividing plate 4 extend to the connection part 29 between the first part 27 and the second part 28, and the flow dividing plate 4 is spaced from the bottom wall at the connection part 29, respectively forming a first side air outlet 5 communicating the first outer mixing inner cavity 231 and the outer mixing outer cavity 24, and a second side air outlet 6 communicating the second outer mixing inner cavity 232 and the outer mixing outer cavity 24. The first side air outlet 5 and the second side air outlet 6 are provided at both ends of the outer mixing inner cavity 23. The gas in the first outer mixing inner cavity 231 enters the outer mixing outer cavity 24 through the first side air outlet 5, and the gas in the second outer mixing inner cavity 232 enters the outer mixing outer cavity 24 through the second side air outlet 6, extending the mixing path of the gas and air, and thus realizing the uniformity of the flame during the combustion of the burner.

[0046] Optionally, the connection part 29 is an inclined surface, the inclined surface connects the bottom walls of the first part 27 and the second part 28, and the flow dividing plate 4 extends at least to the connection part of the inclined surface and the first part 27.

[0047] The flow splitter plate 4 and the outer ring outer wall 22 of the outer mixing inner cavity 23 are integrally connected structures, which improves the connection strength between the flow splitter plate 4 and the burner body 1, enables the flow splitter plate 4 to withstand the impact of the high-speed airflow at the air outlet 31 of the outer ring ejector tube 3, reduces the processing technology, improves the production efficiency, and realizes the cost reduction.

[0048] One end of the flow splitter plate 4 is connected to the outer ring outer wall 22 of the outer mixing inner cavity 23, and the other end of the flow splitter plate 4 is spaced from the outer ring inner wall 21 of the outer mixing inner cavity 23 to form an upper air outlet 7. The upper air outlet 7 enables the first outer mixing inner cavity 231 and the second outer mixing inner cavity 232 to communicate with the outer mixing outer cavity 24 respectively, ensuring that there is a gas outlet volume between the first side air outlet 5 and the second side air outlet 6, and further improving the uniformity of the flame during the combustion of the burner. Optionally, the width of the upper air outlet 7 is greater than or equal to 3 mm, ensuring that there is sufficient gas outlet volume between the first side air outlet 5 and the second side air outlet 6.

[0049] Continue to refer to Figure 1 and Figure 3 As shown, in some embodiments, a second partition plate 26 is provided on the side of the outer mixing outer cavity 24 opposite to the outer mixing inner cavity 23 to divide the outer mixing outer cavity 24. The gas flowing from the first outer mixing inner cavity 231 into the outer mixing outer cavity 24 and the gas flowing from the second outer mixing inner cavity 232 into the outer mixing outer cavity 24 will not mix, ensuring that the respective gases burn independently without interference. At the same time, it can also avoid problems such as gas leakage and flashback when one of the outer ring ejector tubes 3 cannot normally introduce airflow.

[0050] As Figure 1 、 Figure 3 and Figure 4 As shown, the flow splitter plate 4 is provided with an outer fire cap limiting hole 41, which is correspondingly arranged with the first partition plate 25. The first partition plate 25 is provided with an avoidance groove 251. The outer fire cap positioning post 101 on the outer fire cap 100 passes through the outer fire cap limiting hole 41 and is inserted into the avoidance groove 251 to prevent the outer fire cap 100 from rotating circumferentially, causing the flame to burn the pot rack and resulting in higher flue gas. Further optionally, the outer fire cap limiting hole 41 is arranged on the side close to the upper air outlet 7, and the outer fire cap limiting hole 41 penetrates the edge of the flow splitter plate 4, facilitating the processing of the outer fire cap limiting hole 41.

[0051] Based on the above structure, an inner mixing chamber 8 is further provided on the burner head body 1. The inner mixing chamber 8 is disposed inside the outer ring inner wall 21 of the outer mixing chamber 2, and the inner mixing chamber 8 is formed by enclosing an inner ring outer wall 81 and an inner ring inner wall 82. The diameter of the inner ring inner wall 82 is smaller than the diameter of the inner ring outer wall 81. An inner ring ejector tube 9 is provided on the burner head body 1, and the first end of the inner ring ejector tube 9 is communicated with the inner mixing chamber 8. An inner burner cap 200 is covered on the inner mixing chamber 8. The gas and air entering the inner ring ejector tube 9 flow into the inner mixing chamber 8. In the inner mixing chamber 8, after the gas and air are fully mixed, they are discharged through the fire holes on the inner burner cap 200 for combustion.

[0052] An inner burner cap positioning block 83 is provided outside the inner ring outer wall 81. The inner burner cap positioning block 83 is provided with an inner burner cap limiting hole. The inner burner cap positioning post 201 on the inner burner cap 200 is inserted into the inner burner cap limiting hole to prevent the inner burner cap 200 from rotating circumferentially.

[0053] As Figures 2 to 4 shown, the present application further provides a burner, including the above burner head structure and an outer burner cap 100. The outer burner cap 100 is covered on the outer mixing outer cavity 24. The burner further includes an inner burner cap 200. The inner burner cap 200 is covered on the inner mixing chamber 8.

[0054] The burner further includes a nozzle seat 300. The burner head body 1 is placed on the nozzle seat 300. The burner head body 1 is provided with a burner head positioning groove 11 and a burner head limiting groove 12. The nozzle seat 300 is provided with a burner head positioning post 301 and a burner head limiting post 302. The burner head positioning post 301 is inserted into the burner head positioning groove 11, and the burner head limiting post 302 is inserted into the burner head limiting groove 12, realizing the positioning installation of the burner head body 1, and ensuring the stability of the burner head body 1 placed on the nozzle seat 300, and improving the ejector performance of the burner head.

[0055] The nozzle seat 300 is further provided with a gas passage 303. The gas passage 303 is provided with a gas inlet 304. The gas inlet 304 is used to connect with a gas source to introduce gas into the gas passage 304.

[0056] The nozzle seat 300 is provided with an outer ring nozzle 400 and an inner ring nozzle 500. The end of the outer ring ejector tube 3 that is opposite to the first end is set as the second end, and the second end of each outer ring ejector tube 3 corresponds to an outer ring nozzle 400. The end of the inner ring ejector tube 9 that is opposite to the first end is set as the second end, and the second end of the inner ring ejector tube 9 is set corresponding to the inner ring nozzle 500. The air inlet end of the outer ring nozzle 400 is connected with the gas channel 303, and the jet end of the outer ring nozzle 400 is arranged opposite to the air inlet portion arranged at the second end of the outer ring ejector tube 3, and the gas ejected by the outer ring nozzle 400 directly enters the outer ring ejector tube 3. The air inlet end of the inner ring nozzle 500 is connected with the gas channel 303, and the jet end of the inner ring nozzle 500 is arranged opposite to the air inlet portion arranged at the second end of the inner ring ejector tube 9, and the gas ejected by the inner ring nozzle 500 directly enters the inner ring ejector tube 9.

[0057] The air inlet end of the outer ring nozzle 400 passes through the side wall of the gas channel 303 and is threadedly locked with the side wall, thereby improving the sealing performance of the connection between the outer ring nozzle 400 and the gas channel 303 and avoiding safety risks such as gas leakage.

[0058] The air inlet end of the inner ring nozzle 500 passes through the side wall of the gas channel 303 and is threadedly locked with the side wall, thereby improving the sealing performance of the connection between the inner ring nozzle 500 and the gas channel 303 and avoiding safety risks such as gas leakage.

[0059] Reference Figure 3 and Figure 4 As shown, the burner further includes a thermocouple 600, one end of which is fixed on the nozzle seat 300, and the other end of which penetrates the space between the outer mixing chamber 2 and the inner mixing chamber 8 of the burner body 1 and is placed between the inner fire cover 200 and the outer fire cover 100. A thermocouple stopper 84 is provided on the outer side of the inner ring outer wall 81 of the burner body 1, and a thermocouple stopper hole is provided on the thermocouple stopper 84. The thermocouple 600 penetrates the thermocouple stopper hole, which plays a role in limiting the position of the thermocouple 600.

[0060] The burner also includes an anti-dry burning probe 700, a fixed seat mounting groove 305 is provided on the nozzle seat 300, a fixed seat 306 is provided in the fixed seat mounting groove 305, one end of the anti-dry burning probe 700 is fixedly connected to the fixed seat 306, and the other end of the anti-dry burning probe 700 passes through the annular cavity of the inner mixing chamber 8 and the inner ring of the inner fire cover 200 and is placed in the middle of the burner.

[0061] The present application also provides a gas stove, comprising the above-mentioned burner. The gas stove can be an integrated stove or a split gas stove.

[0062] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Furnace head structure, characterized in that: include: A burner body (1), wherein an external mixing chamber (2) is provided on the burner body (1), wherein the external mixing chamber (2) comprises an external mixing inner chamber (23) and an external mixing outer chamber (24) which are connected to each other, wherein a first partition plate (25) is provided in the external mixing inner chamber (23) and divides the external mixing inner chamber (23) into a first external mixing inner chamber (231) and a second external mixing inner chamber (232); Two outer ring ejector tubes (3), the two outer ring ejector tubes (3) being respectively connected to the furnace head body (1), the first end of the first outer ring ejector tube (3) passing through the outer ring inner wall (21) of the first outer mixing cavity (231) and being placed in the first outer mixing cavity (231), the first end of the second outer ring ejector tube (3) passing through the outer ring inner wall (21) of the second outer mixing cavity (232) and being placed in the second outer mixing cavity (232), the first ends of the two outer ring ejector tubes (3) being respectively provided with air outlets (31).

2. The furnace head structure according to claim 1, characterized in that: The gas outlet (31) is arranged toward the outer ring outer wall (22) of the outer mixing cavity (23).

3. The furnace head structure according to claim 2, characterized in that: The outer ring ejector tube (3) comprises an air inlet portion (32), a throat portion (33) and an ejector portion (34) which are connected in sequence, and a portion of the ejector portion (34) is disposed in the outer mixing cavity (23); The gas outlet (31) is arranged at the end of the first end of the outer ring ejector tube (3), and the distance between each gas outlet (31) and the outer wall (22) of the outer ring is L2, and d1≤L2≤2d1; Wherein, d1 is the inner diameter of the throat (33).

4. The furnace head structure according to claim 1, characterized in that: The outer ring ejector tube (3) comprises an air inlet portion (32), a throat portion (33) and an ejector portion (34) which are connected in sequence, a portion of the ejector portion (34) is disposed in the outer mixing cavity (23), and a length of the ejector portion (34) is L1, and L1 is ≥ 3.8d1; Wherein, d1 is the inner diameter of the throat (33).

5. The furnace head structure according to any one of claims 1 to 4, characterized in that: The outer mixing chamber (2) comprises a first portion (27) and a second portion (28), the depth of the first portion (27) being greater than that of the second portion (28), the first portion (27) being the outer mixing chamber (23), the chamber opening cover of the outer mixing chamber (23) being provided with a diverter plate (4), and one side of the diverter plate (4) being in contact with the first partition plate (25), the diverter plate (4) and the second portion (28) being arranged to enclose the outer mixing chamber (24), the two ends of the diverter plate (4) extending to the connecting portion (29) of the first portion (27) and the second portion (28), and the diverter plate (4) and the bottom wall of the connecting portion (29) being spaced apart, respectively forming a first side air outlet (5) connecting the first outer mixing chamber (231) and the outer mixing chamber (24), and a second side air outlet (6) connecting the second outer mixing chamber (232) and the outer mixing chamber (24).

6. The furnace head structure according to claim 5, characterized in that: One end of the splitter plate (4) is connected to the outer ring outer wall (22) of the outer mixing inner cavity (23), and the other end of the splitter plate (4) is spaced apart from the outer ring inner wall (21) of the outer mixing inner cavity (23) to form an upper air outlet (7), wherein the upper air outlet (7) enables the first outer mixing inner cavity (231) and the second outer mixing inner cavity (232) to communicate with the outer mixing outer cavity (24) respectively; And / or, the diverter plate (4) and the outer ring outer wall (22) of the outer mixing cavity (23) are an integrally connected structure.

7. The furnace head structure according to claim 6, characterized in that: The width of the upper air outlet (7) is greater than or equal to 3 mm.

8. The furnace head structure according to any one of claims 1 to 4, characterized in that: A second partition plate (26) is provided on a side of the external mixing cavity (24) opposite to the external mixing cavity (23).

9. A burner, characterized in that It comprises an outer fire cover (100) and a burner head structure according to any one of claims 1 to 8, wherein the outer fire cover (100) is arranged on the outer mixing cavity (24).

10. A gas stove, characterized in that: Comprising the burner as claimed in claim 9.

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