Combustor

Abstract

The invention provides a combustor which comprises a fire distributor, an inner fire cover and an outer fire cover, an air channel and an outer ring gas channel are formed between the fire distributor and the outer fire cover, and the air channel and the outer ring gas channel are not communicated. The outer fire cover is provided with a plurality of outer fire holes distributed along the first circumference of the outer fire cover and a plurality of outer air holes distributed along the second circumference of the outer fire cover, each outer fire hole corresponds to one outer air hole to form an air hole set, and the axes of the outer fire holes and the axes of the outer air holes in the same air hole set are located on the same radial line. A first included angle is formed between the axis of the outer fire hole and the bottom plane of the outer fire cover, a second included angle is formed between the axis of the outer air hole and the bottom plane of the outer fire cover, the first included angle is alpha 1, the second included angle is alpha 2, and the first included angle and the second included angle meet the following relation that alpha 2 is larger than 0 degree and smaller than alpha 1 and smaller than 90 degrees. According to the combustor, secondary air can make contact with gas flames instantly after being sprayed out, air diffusion and loss are avoided, and the air utilization rate is increased to 80% or above.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and more specifically to a burner. Background Technology

[0002] Currently, blower-type household gas stoves mainly employ two technical approaches: primary air injection and secondary air injection. The primary air injection method forces air into the primary air passage of the burner using a fan, aiming to improve the premixing effect of gas and air. The secondary air injection method forcibly supplements the outer area of ​​the combustion flame with secondary air, promoting complete combustion of gas and avoiding interference with the primary air injection structure.

[0003] However, the current secondary air supplement scheme has an unreasonable structural design and the following technical problems: most of the air cannot participate in combustion, which not only wastes air, but also takes away heat after being heated, ultimately leading to incomplete combustion and difficulty in improving thermal efficiency. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a burner.

[0005] The technical solution used in this invention is as follows: A burner is provided, including a flame distributor, an inner burner cap, and an outer burner cap. The flame distributor and the outer burner cap form an air passage and an outer annular gas passage, which are not connected. The outer burner cap is provided with a plurality of outer flame holes distributed along a first circumference and a plurality of outer air holes distributed along a second circumference. The radii of the first and second circumferences are different. Each outer flame hole corresponds to an outer air hole, forming a group of air holes. The axes of the outer flame holes and outer air holes in the same group are on the same radial line. Viewed from above, multiple external air holes and multiple external flame holes form a double-layered annular radial distribution structure. The external flame holes are connected to the outer annular gas passage, and the external air holes are connected to the air passage. In the axial direction of the outer flame cover, the external air holes are located above the external flame holes. The axis of the external flame holes forms a first angle with the bottom plane of the outer flame cover, and the axis of the external air holes forms a second angle with the bottom plane of the outer flame cover. The first angle is denoted as α1, and the second angle is denoted as α2. The first angle and the second angle satisfy the following relationship: 0° < α2 < α1 < 90°.

[0006] Preferably, the first included angle is 30°~70°.

[0007] Preferably, the first included angle is 30°~50°, and the difference between the first included angle and the second included angle is the cross included angle, which is 10°~30°.

[0008] Preferably, the vertical height difference between the outlet of the external air hole and the outlet of the external fire hole is 1-2 mm.

[0009] Preferably, the flame cap has an exhaust surface, and the outlet of the outer flame hole and the outlet of the outer air hole are both located on the exhaust surface. The exhaust surface is inclined outward from top to bottom, and the exhaust surface forms an angle of 20° to 50° with the bottom plane of the outer flame cap.

[0010] Preferably, the air passage includes a main air passage and a secondary air passage, which are connected by a buffer port. The outer burner cap includes a partition wall, an inner ring wall, an outer ring wall, and an inner baffle wall. The partition wall separates the air passage and the outer ring gas passage. The main air passage is formed between the inner ring wall, the partition wall, and the burner. The outer ring gas passage is formed between the partition wall, the outer ring wall, and the burner. The inner baffle wall is connected below the inner ring wall and extends towards the center of the outer burner cap. The inner burner cap is installed in the mounting position enclosed by the inner baffle wall. The inner baffle wall is provided with circumferentially spaced inner air holes. The secondary air passage is formed between the inner baffle wall and the burner cap. The main air passage is connected to the outer air hole, and the secondary air passage is connected to the inner air hole.

[0011] Preferably, the inner baffle wall has an ignition mounting port, which is not connected to the air passage. The inner baffle wall is parallel to the bottom plane of the outer flame cap. The inner ring wall is inclined inward from top to bottom. The inner ring wall has multiple secondary air holes at the ignition mounting port, which are connected to the main air passage.

[0012] Preferably, the outer flame cap further includes an outer baffle wall, which is connected to the lower part of the outer ring wall and extends in a direction away from the center of the outer flame cap. The outer baffle wall is inclined outward from top to bottom, and the outer ring gas passage is formed between the partition wall, the outer ring wall, the outer baffle wall and the flame distributor.

[0013] Preferably, the outer flame cap has an annular lower flame stabilizing slit, which cuts through the outer annular wall and communicates with the outer flame hole. The outlet of the lower flame stabilizing slit is located below the outlet of the outer flame hole, and the depth direction of the lower flame stabilizing slit is parallel to the bottom plane.

[0014] Preferably, an upper flame stabilizer hole is provided between adjacent groups of vents, the axis of the outlet of the upper flame stabilizer hole is above the axis of the outlet of the outer flame hole, and the upper flame stabilizer hole is located between the first circumference and the second circumference.

[0015] The burner provided by this invention has the following significant advantages:

[0016] The burner provided by this invention features a rationally designed first and second angle, enabling secondary air and combustion gas to cross-spray. Through airflow collision and entrainment effects, the mixing uniformity is significantly improved. This design allows the secondary air to come into instantaneous contact with the combustion gas flame after being ejected, preventing air diffusion and loss, and increasing air utilization to over 80%, thus ensuring complete combustion of the combustion gas. Attached Figure Description

[0017] The above and other objects, features, and advantages of the invention will become clearer through a more detailed description of the preferred embodiments illustrated in the accompanying drawings. The same reference numerals denote the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of the invention.

[0018] Figure 1 This is a schematic diagram of the burner structure provided by the present invention.

[0019] Figure 2 and Figure 4 These are schematic diagrams of the cross-sectional structure of the burner provided by the present invention at different angles.

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the outer flame cap provided by the present invention.

[0021] Figure 5 This is a top-view structural diagram of the burner provided by the present invention.

[0022] Outer burner cap 100; Gas outlet surface 11; Gas port group 110; Outer burner port 1101; Outer air port 1102; Inner ring wall 121; Outer ring wall 122; Inner baffle wall 123; Ignition mounting port 1231; Outer baffle wall 124; Separator wall 125; Inner air port 13; Secondary air port 131; Buffer port 14; Lower flame stabilizer slit 15; Upper flame stabilizer slit 16; Flame distributor 200; Inner burner cap 300; Main air passage 10; Secondary air passage 20; Outer ring gas passage 30; First circumference a; Second circumference b; Radial line c. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention. In this embodiment, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0024] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to and integrated with the other element, or there may be an intervening element present. The terms "mounted," "one end," "the other end," and similar expressions used in this invention are for illustrative purposes only.

[0025] Please refer to Figure 1-5 This invention provides a burner for supplementing secondary air, including a flame distributor 200, an inner burner cap 300, and an outer burner cap 100. The flame distributor 200 and the outer burner cap 100 form an air passage and an outer ring gas passage 30, which are not connected. The air passage includes a main air passage 10 and a secondary air passage 20. The outer burner cap 100 is provided with a plurality of outer flame holes 1101 distributed along a first circumference a and a plurality of outer air holes 1102 distributed along a second circumference b. The first circumference a and the second circumference b are auxiliary lines to facilitate understanding the distribution of the outer flame holes 1101 and the outer air holes 1102 on the burner cap. The radii of the first circumference a and the second circumference b are different. Each external burner hole 1101 corresponds to an external air hole 1102, forming a vent group 110. The axes of the external burner holes 1101 and the external air holes 1102 in the same vent group 110 are on the same radial line c. From the top view of the external burner cap 100, the multiple external air holes 1102 and the multiple external burner holes 1101 form a double-layer annular radial distribution structure. The external burner holes 1101 are connected to the outer annular gas passage 30, and the external air holes 1102 are connected to the air passage. In the axial direction of the external burner cap 100, the external air holes 1102 are located above the external burner holes 1101. The axis of the external burner holes 1101 forms a first included angle with the bottom plane of the external burner cap 100, and the axis of the external air holes 1102 forms a second included angle with the bottom plane of the external burner cap 100. The first included angle is set as α1, and the second included angle is set as α2. The first included angle and the second included angle satisfy the following relationship: 0°<α2<α1<90°.

[0026] The burner provided by this invention features a rationally designed first and second included angle. This angle design allows secondary air and combustion gas to form a cross-injection pattern, breaking the limitations of traditional parallel or staggered injection. Through the airflow collision and entrainment effect, the mixing uniformity is significantly improved. Because α1 > α2, the combustion gas flow can exert a downward entrainment force on the secondary air, preventing air from diffusing upwards. The shear force and disturbance between the airflows are further enhanced, prompting the combustion gas and air to quickly break the stratification state and form a uniform mixed airflow. At the same time, this angle relationship allows the secondary air to accurately cover the outer to middle layer of the flame, forming a gradient mixing with the combustion gas from the outside to the inside, further solving the problem of incomplete combustion. Furthermore, the outer ring air hole 1102 is located above the corresponding outer ring flame hole 1101. This design allows the secondary air to come into instantaneous contact with the combustion gas flame after being ejected, preventing air diffusing and loss.

[0027] refer to Figure 3 In a preferred embodiment, the included angle between the two airflows is α1 - α2, which is the difference between the first included angle and the second included angle. The included angle between the two airflows satisfies the following condition:

[0028] In the formula: α1 - α2 is the angular difference between the first and second included angles; α2 is the gas ejection velocity, which is about 5~8 m / s at the outlet of the burner of a common household gas stove (affected by pressure and heat load). The secondary air ejection velocity is typically 3-6 m / s; It is the relative velocity of the gas and secondary air in the mixing zone. The greater the relative velocity of the gas and secondary air in the mixing zone, the more intense the mixing. However, if it is too high, it will cause the flame to be blown away from the burner hole (flameout) or backfire. Below 1 m / s, the shear force between the fuel gas and air is insufficient, resulting in slow mixing and potentially incomplete combustion. Above 4 m / s, the mixing is vigorous but excessively disturbs the flame, increasing the risk of flameout. To achieve efficient mixing and flame stability, the value of c is set between 2 and 4 m / s.

[0029] This formula shows that the angle between the two airflows helps to increase relative speed. For example: Take... It is 5 m / s; The velocity is 4.2 m / s; when α1 - α2 = 0°, and the jet is parallel (angle 0°), the calculated value is... = 0.8m / s, the mixing effect is poor; when α1 - α2 = 25°, cross-spraying (angle exists), the calculation yields It has a speed of approximately 2.1 m / s, which provides a highly efficient mixing effect.

[0030] Therefore, to achieve efficient mixing and flame stability, the cross angle between the two airflows is controlled between 10° and 30°. When the cross angle exists, the relative velocity is higher than that of parallel injection (angle 0°, v). r The value of |v2-v1| increases significantly, and because α1>α2, the combustion gas flow can exert a downward entrainment force on the secondary air, preventing air from diffusing upwards. The shear force and disturbance between the airflows are further enhanced, prompting the combustion gas and air to quickly break the stratification state and form a uniformly mixed airflow. At the same time, this angular relationship allows the secondary air to accurately cover the outer to middle layer of the flame, forming a gradient mixing with the combustion gas from the outside to the inside, further solving the problem of incomplete combustion.

[0031] In a preferred embodiment, the difference between the first included angle and the second included angle is the cross included angle (α1 - α2). α1 is preferably set to 30°~70°, and α2 is preferably set to 30°~50°, ensuring that the cross included angle is controlled within 10°~30°. This utilizes the entrainment force of the gas flow to improve the mixing effect, while avoiding excessively large included angles that could cause the flame to scatter or detach. It also adapts to the design of the secondary air being injected from directly above, achieving a precise match between the airflow trajectory and the flame shape.

[0032] From the perspective of heat loss, because all secondary air participates in combustion and no ineffective air is heated and then discharged, combined with the complete combustion characteristics brought about by cross-mixing, both the heat loss from incomplete combustion q3 and the heat loss from exhaust q2 are significantly reduced. The formula for calculating the thermal efficiency of a stove is as follows:

[0033] η = 100% - q2 - q3 - q4 - q5

[0034] In the formula: q2 is the heat loss from flue gas, q3 is the heat loss from incomplete combustion, q4 is the heat dissipation loss, and q5 is the ash loss (which can be ignored for household gas stoves).

[0035] The burner provided by this invention ensures that the cross angle is controlled between 10° and 30°, resulting in good mixing, extremely low heat loss q3 due to incomplete combustion, intense and concentrated combustion, and further efficient heat transfer. It requires less excess air and has less exhaust heat loss. According to calculations, the heat loss is reduced by 30% to 40% compared with existing solutions, and it ultimately aims to achieve a stable thermal efficiency of 80% or higher.

[0036] The burner provided by this invention, with its cross-spray pattern of α1 > α2, makes the flame combustion more intense and the temperature more concentrated, significantly improving the heating uniformity of the pot bottom. It avoids the problems of high-temperature ineffective air carrying away heat and insufficient local heating in existing solutions, thus balancing energy efficiency and user experience.

[0037] The burner provided by this invention features a precise match between the air vent and the flame vent, eliminating flame flickering and flameout issues caused by airflow impact. It also offers more precise oxygen-fuel ratio control, more complete combustion reaction, and significantly reduced carbon monoxide emissions, thus balancing energy efficiency and environmental performance.

[0038] refer to Figure 3 In a preferred embodiment, the vertical height difference between the outlet of the external air hole 1102 and the outlet of the external flame hole 1101 is 1-2 mm. This design allows the secondary air to come into instantaneous contact with the combustion flame after being ejected, preventing air diffusion and loss.

[0039] refer to Figure 1-3 The burner cap has an exhaust surface 11. The outlets of the outer flame hole 1101 and the outer air hole 1102 are both located on the exhaust surface 11. The exhaust surface 11 is inclined outward from top to bottom, forming a third included angle α3 between the exhaust surface 11 and the bottom plane of the outer burner cap 100, with the third included angle being 20°-50°. The inclined exhaust surface 11, and its appropriate angle, provides a common, directional injection reference plane for the outlets of the outer flame hole 1101 and the outer air hole 1102. This allows the combustion gas flow and the air flow ejected at angles α1 and α2, respectively, to acquire a unified, outward-facing axial velocity component the instant they leave the burner cap, promoting earlier and smoother convergence and fusion of the two airflows on a predetermined intersection trajectory, reducing the disordered diffusion of the initial stage of the airflow.

[0040] refer to Figure 2-4 In a preferred embodiment, the outer flame cover 100 includes a partition wall 125, an inner ring wall 121, an outer ring wall 122, and an inner baffle wall 123. The inner ring wall 121, partition wall 125, and outer ring wall 122 are arranged sequentially from the inside to the outside. The partition wall 125 and the wall on the flame distributor 200 separate the air passage and the outer ring gas passage 30, making the air passage and the outer ring gas passage 30 independent. The air passage includes a main air passage 10 and a secondary air passage 20, which are connected by a buffer port 14. The inner ring wall 121, partition wall 125, and flame distributor 200 are connected by a buffer port 14. A main air passage 10 is formed between the burners 200, and an outer ring gas passage 30 is formed between the partition wall 125, the outer ring wall 122 and the burner 200. An inner baffle wall 123 is connected to the lower part of the inner ring wall 121 and extends towards the center of the outer burner cap 100. The inner burner cap 300 is installed in the mounting position enclosed by the inner baffle wall 123. The inner baffle wall 123 is provided with circumferentially spaced inner air holes 13. A secondary air passage 20 is formed between the inner baffle wall 123 and the burner 200. The main air passage 10 is connected to the outer air hole 1102, and the secondary air passage 20 is connected to the inner air hole 13.

[0041] By extending the inner baffle 123 toward the center of the outer burner cap 100, the inner air holes 13 on it are brought closer to the flame root of the inner burner cap 300. This design significantly shortens the secondary air supply path, effectively reducing air diffusion and pressure loss during transport, thereby achieving precise, close-range, and high-intensity air supply to the inner ring flame. This not only greatly improves the mixing speed and uniformity of the inner ring combustion gas and air, enhancing the combustion intensity and stability of the inner ring flame, but also, through synergy with the efficient combustion of the outer ring, improves the overall thermal efficiency and emission performance of the burner.

[0042] The main air channel 10 and the secondary air channel 20 are connected by a buffer port 14, introducing a crucial dynamic damping and buffering mechanism into the inner ring air supply system. When the combustion load drops sharply, the amount of fuel gas decreases rapidly, but the airflow may still maintain a high velocity due to its inertia. Without a buffer, this excessively fast secondary air will directly impact the initial small flame (ignition flame) in the inner ring, easily blowing it away or extinguishing it, leading to interruption of ignition and failure. This invention, through the buffer port 14 connecting the main and secondary channels, can quickly absorb and dissipate excess air pressure in the main channel, preventing all high-pressure air from rushing into the secondary channel. This effectively slows down the airflow velocity towards the inner air hole 13, making it stable. The stable airflow ensures that the air supplied to the small flame is appropriate and gentle, supporting combustion without causing impact, thereby greatly improving the reliability and success rate of ignition.

[0043] refer to Figure 2-4 In a preferred embodiment, the outer flame cap 100 further includes an outer baffle wall 124. The outer baffle wall 124 is connected to the lower part of the outer ring wall 122 and extends in a direction away from the center of the outer flame cap 100. The outer baffle wall 124 is inclined outward from top to bottom. An outer ring gas passage 30 is formed between the partition wall 125, the outer ring wall 122, the outer baffle wall 124 and the flame distributor 200. The outer baffle wall 124 can act as a baffle to turbulent the outer ring gas passage 30. When the gas enters the outer ring gas passage 30, it will be affected by the outer baffle wall 124.

[0044] The design of the outer baffle wall 124 further optimizes the burner's aerodynamic performance and structural stability. Its outwardly inclined extension from top to bottom forms a gradually expanding guide surface at the gas passage inlet, effectively guiding the gas smoothly and evenly into the outer annular gas passage 30, reducing local eddies and pressure losses caused by abrupt changes in flow direction, thereby improving gas delivery efficiency and the uniformity of the output gas. Simultaneously, the outer baffle wall 124 acts as a physical baffle, moderately disturbing and rectifying the gas flow, allowing for more thorough premixing of the gas within the passage, laying a good foundation for rapid cross-mixing with secondary air at the outlet. Furthermore, this inclined structure enhances the rigidity of the bottom edge of the outer burner cap 100 and facilitates the outward diffusion of heat from the high-temperature zone, reducing the risk of localized overheating of the burner cap to some extent, and improving the long-term structural reliability and durability of the burner. This design, combined with the aforementioned angle-optimized outer burner orifice 1101 and outer air orifice 1102, works synergistically from multiple dimensions—airflow distribution, enhanced mixing, and structural stability—to jointly ensure the burner's efficient, stable, and complete combustion performance.

[0045] refer to Figure 4-5 In a preferred embodiment, the inner baffle wall 123 has an ignition mounting port 1231 for mounting an ignition needle and thermocouple, ensuring that the ignition needle and thermocouple are close to the inner burner cap 300. The ignition mounting port 1231 is not connected to the air passage, effectively isolating the secondary airflow with a certain velocity from the secondary air passage 20 from interfering with the ignition spark path and ensuring a high ignition success rate. While ensuring the stability and reliability of the core functions of ignition and safety protection, the structure is cleverly integrated and works in conjunction with the air supply system, contributing to the overall design goals of a highly efficient, safe, and compact burner.

[0046] refer to Figure 2-4 In a preferred embodiment, the inner baffle wall 123 is parallel to the bottom plane of the outer flame cap 100. This parallel design of the inner baffle wall 123 ensures that the secondary air passage 20 formed by the inner baffle wall 123 and the flame spreader 200 maintains a more consistent cross-section and flow direction in both the circumferential and axial directions. This facilitates smooth and uniform flow of secondary air within it, reducing unnecessary turbulence and pressure loss. Simultaneously, it provides a reference plane for the opening of the inner air holes 13, making it easier to precisely control the axial angle and exhaust direction of all inner air holes 13.

[0047] refer to Figure 2-4In a preferred embodiment, the inner ring wall 121 slopes inward from top to bottom, resulting in a relatively small volume above the main air passage 10. Air is discharged from the outer air hole 1102 above the main air passage 10. The reduced volume at the top of the passage, combined with the position of the outer air hole 1102, effectively converges and guides the airflow. This concentrates the flow path of the secondary air towards the combustion flame area ejected from the outer flame hole 1101, reducing the diffusion and dissipation of air within the passage before ejection. This concentrated supply mode allows precious secondary air to be delivered more precisely to the rear part of the flame where combustion is most needed, avoiding ineffective loss and improving air utilization efficiency.

[0048] refer to Figure 2-5 In a preferred embodiment, the radius of the first circumferential line a is greater than the radius of the second circumferential line b. Relatively speaking, the outer air hole 1102 is positioned higher in the axial direction (the terms "upper" and "lower" in the axial direction in this invention can be referenced). Figure 3 To understand this, the radially upward outer air hole 1102 is closer to the center of the outer flame cap 100, while the outer flame hole 1101 is farther from the center of the outer flame cap 100 and closer to the edge of the outer flame cap 100 (refer to...). Figure 5 (To understand).

[0049] The external air vent 1102 is positioned higher in the axial direction, and combined with its smaller injection elevation angle (α2), its airflow trajectory is closer to horizontal or slightly downward in the initial stage. The external flame vent 1101, on the other hand, is positioned slightly lower and injects air upward at a larger elevation angle (α1). This difference in axial position, combined with the angular difference of α1 > α2, forms a three-dimensional shearing and enveloping structure where "lower-layer combustion gas is lifted upwards, and upper-layer air is cut downwards," effectively preventing secondary air from drifting upwards and being lost without being utilized.

[0050] The outer air hole 1102 is located on the inner side (near the center), while the outer flame hole 1101 is located on the outer side (near the edge). This gives the secondary airflow ejected from the outer air hole 1102 a radial velocity component from the inside out, while the combustion gas flow ejected from the outer flame hole 1101 mainly diffuses radially outward. The two form a natural opposing crossover and penetration relationship in the radial direction. The airflow actively cuts into the combustion gas flow from the inner root of the flame, enabling earlier and deeper contact and mixing with the combustion gas, achieving deep mixing starting from the core region of the flame.

[0051] refer to Figure 4-5In a preferred embodiment, the stable and efficient combustion of the inner ring flame relies on the secondary air provided by the circumferentially uniformly distributed inner air holes 13 on the inner baffle wall 123. However, the opening of the ignition mounting port 1231 creates an air supply gap at this circumferential location. To address this issue, the inner ring wall 121 is provided with multiple secondary air holes 131 at the ignition mounting port 1231 to compensate for the secondary air. These secondary air holes 131 are connected to the main air channel 10. This structure effectively eliminates the problems of incomplete local combustion, uneven flame height, or uneven temperature distribution that may be caused by uneven air supply, ensuring the circumferential integrity and uniformity of the inner ring flame.

[0052] refer to Figure 3-4 In a preferred embodiment, the outer flame cap 100 has a continuous annular lower flame stabilizing slit 15. The lower flame stabilizing slit 15 cuts through the outer annular wall 122 and communicates with the outer flame hole 1101. The outlet of the lower flame stabilizing slit 15 is located below the outlet of the outer flame hole 1101, and the depth direction of the lower flame stabilizing slit 15 is parallel to the bottom plane. Although the design of the first and second included angles greatly promotes mixing, it also increases the uncertainty of the flow field and the risk of the flame being blown away. The lower flame stabilizing slit 15 establishes a continuous and stable flame anchor point in the flame root region that is not subject to severe disturbances from the main airflow, ensuring the stability and safety of combustion (preventing flameout and backfire).

[0053] In a preferred embodiment, an upper flame stabilizing hole 16 is provided between adjacent vent groups 110. The axis of the outlet of the upper flame stabilizing hole 16 is above the axis of the outlet of the outer flame hole 1101, and the upper flame stabilizing hole 16 is located between the first circumferential line a and the second circumferential line b. The upper flame stabilizing hole 16 is not a simple repetition of the function of the lower flame stabilizing slot 15, but a precise intervention for different spatial regions of the flame and different instability mechanisms. It and the lower flame stabilizing slot 15 form a three-dimensional flame anchoring network from the root to the middle, and together with the cross-angled mixed airflow, it constitutes a virtuous cycle of promoting mixing through stability and strengthening stability through mixing.

[0054] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A burner, characterized in that, The device includes a flame distributor, an inner flame cap, and an outer flame cap. The flame distributor and the outer flame cap form an air passage and an outer ring gas passage, which are not connected. The outer flame cap has multiple outer flame holes distributed along a first circumference and multiple outer air holes distributed along a second circumference. The radii of the first and second circumferences are different. Each outer flame hole corresponds to one outer air hole, forming a group of air holes. The axes of the outer flame holes and outer air holes in the same group are on the same radial line. Viewed from the top of the outer flame cap, the multiple outer flame holes... An air hole and multiple external flame holes form a double-layer annular radial distribution structure. The external flame holes are connected to the outer annular gas passage, and the external air holes are connected to the air passage. On the axial direction of the external flame cap, the external air holes are located above the external flame holes. The axis of the external flame holes forms a first angle with the bottom plane of the external flame cap, and the axis of the external air holes forms a second angle with the bottom plane of the external flame cap. The first angle is set as α1, and the second angle is set as α2. The first angle and the second angle satisfy the following relationship: 0° < α2 < α1 < 90°.

2. The burner as claimed in claim 1, characterized in that, The first included angle is 30°~70°.

3. The burner as described in claim 2, characterized in that, The first included angle is 30°~50°, and the difference between the first included angle and the second included angle is the cross included angle, which is 10°~30°.

4. The burner as claimed in claim 1, characterized in that, The vertical height difference between the outlet of the external air hole and the outlet of the external fire hole is 1~2mm.

5. The burner as claimed in claim 1, characterized in that, The outer flame cap has an exhaust surface, and the outlet of the outer flame hole and the outlet of the outer air hole are both located on the exhaust surface. The exhaust surface is inclined outward from top to bottom, and the exhaust surface forms an angle of 20°-50° with the bottom plane of the outer flame cap.

6. The burner as claimed in claim 1, characterized in that, The air passage includes a main air passage and a secondary air passage, which are connected by a buffer port. The outer burner cap includes a partition wall, an inner ring wall, an outer ring wall, and an inner baffle wall. The partition wall separates the air passage and the outer ring gas passage. The main air passage is formed between the inner ring wall, the partition wall, and the burner. The outer ring gas passage is formed between the partition wall, the outer ring wall, and the burner. The inner baffle wall is connected to the lower part of the inner ring wall and extends towards the center of the outer burner cap. The inner burner cap is installed in the mounting position enclosed by the inner baffle wall. The inner baffle wall is provided with circumferentially spaced inner air holes. The secondary air passage is formed between the inner baffle wall and the burner cap. The main air passage is connected to the outer air hole, and the secondary air passage is connected to the inner air hole.

7. The burner as claimed in claim 6, characterized in that, The inner baffle wall has an ignition mounting port, which is not connected to the air passage. The inner baffle wall is parallel to the bottom plane of the outer flame cap. The inner ring wall is inclined inward from top to bottom. The inner ring wall has multiple secondary air holes at the ignition mounting port, which are connected to the main air passage.

8. The burner as claimed in claim 6, characterized in that, The outer flame cap also includes an outer baffle wall, which is connected to the lower part of the outer ring wall and extends in a direction away from the center of the outer flame cap. The outer baffle wall is inclined outward from top to bottom, and the outer ring gas passage is formed between the partition wall, the outer ring wall, the outer baffle wall and the flame distributor.

9. The burner as claimed in claim 1, characterized in that, The outer flame cap has an annular lower flame stabilizing slit, which cuts through the outer annular wall and communicates with the outer flame hole. The outlet of the lower flame stabilizing slit is located below the outlet of the outer flame hole, and the depth direction of the lower flame stabilizing slit is parallel to the bottom plane.

10. The burner as claimed in claim 1, characterized in that, There is an upper flame stabilizer between adjacent groups of vents, the axis of the outlet of the upper flame stabilizer is above the axis of the outlet of the outer flame hole, and the upper flame stabilizer is located between the first circumference and the second circumference.

Images