Fire grate, burner and gas water heating apparatus

Abstract

The application belongs to the technical field of combustion, and specifically discloses a fire grate, a combustor and a gas water heating device. The fire grate comprises an injection part with an injection channel, the inner wall of the injection channel is provided with a spoiler structure protruding in the direction of the center line of the injection channel, so that the injection channel forms a spoiler channel part at the position of the spoiler structure; the spoiler structure comprises at least two spoiler parts arranged at intervals in the circumferential direction of the injection channel, the spoiler structure comprises at least two spoiler parts arranged at intervals in the circumferential direction of the injection channel, the spoiler part extends in the direction of airflow flow in the injection channel, and the spoiler part is obliquely arranged so that the two ends of the spoiler part are arranged at intervals in the circumferential direction of the injection channel. The application can prolong the residence time of the gas in the injection channel, improve the mixing effect of the gas and air, and further improve the combustion completeness and combustion stability.

Description

Technical Field

[0001] This invention relates to the field of combustion technology, and in particular to a burner, a gas-fired hot water device. Background Technology

[0002] The burner is the core component of gas water heaters, gas wall-hung boilers and other gas water heating equipment. Its combustion stability and completeness directly affect the performance of the gas water heating equipment.

[0003] Existing burners used in gas-fired water heaters typically consist of multiple burners arranged side-by-side. Each burner contains a connected ejector channel and a gas passage. A flame hole is located at the upper end of the gas passage, igniting the gas flowing through the passage and flame hole to form a flame. With the increasing demand for thinner gas-fired water heaters, the burner thickness is becoming narrower, leading to a reduction in the cross-sectional area of ​​the gas passage. This, in turn, increases the velocity of the gas mixture flowing out of the passage and shortens the residence time of the gas inside the burner. This can easily result in uneven mixing of gas and air, leading to unstable combustion and negatively impacting the user experience of both the burner and the gas-fired water heater.

[0004] Therefore, there is an urgent need for a firebox, burner, and gas-fired hot water equipment to solve the above-mentioned technical problems. Summary of the Invention

[0005] The first technical problem solved by the present invention is to provide a burner that can effectively improve the uniformity of gas-air mixing.

[0006] The second technical problem solved by the present invention is to provide a burner that can effectively improve the uniformity of gas-air mixing during the operation of existing burners.

[0007] The third technical problem solved by the present invention is to provide a gas-fired hot water device that can effectively improve the uniformity of gas-air mixing during the operation of existing burners.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] A fire brute includes an ejector section having an ejector channel, wherein the inner wall of the ejector channel is provided with a turbulence structure protruding along the direction toward the center line of the ejector channel, so that the ejector channel forms a turbulence channel section at the location of the turbulence structure.

[0010] The turbulence structure includes at least two turbulence portions spaced circumferentially along the ejector channel. The turbulence portions extend along the airflow direction within the ejector channel, and the turbulence portions are inclined such that their two ends are spaced circumferentially along the ejector channel.

[0011] Compared with the prior art, the firebox described in this invention has the following advantages: Because the inner wall of the ejector channel is provided with a turbulence structure protruding along the direction towards the centerline of the ejector channel, when the airflow passes through the turbulence channel, the airflow near the wall of the turbulence channel will collide with the turbulence structure, thereby changing the flow direction and better mixing with the airflow (mainly combustion gas) in the central area, improving the mixing effect of air and combustion gas. Simultaneously, the turbulence structure increases the flow resistance of the airflow in the ejector channel, prolonging the residence time of the airflow in the ejector channel, further improving the mixing effect of air and combustion gas. Furthermore, because the turbulence section extends obliquely along the airflow direction, the airflow forms an upward counterclockwise or clockwise swirling flow under the guidance of the obliquely set turbulence section, making the mixing of combustion gas and air more complete, effectively improving the completeness of the mixing of combustion gas and air, thereby effectively improving the uniformity of the flame at the burner holes, improving combustion completeness and combustion efficiency, reducing harmful substances produced during combustion, and improving the combustion stability and reliability of the firebox, which is beneficial for the thinning design of the firebox.

[0012] In one embodiment, the height of the turbulence portion protruding from the inner wall of the ejector channel gradually increases along the airflow direction.

[0013] In one embodiment, in a projection plane perpendicular to the thickness direction of the fire bar, the angle between the extension direction of the turbulence section and the center line of the ejector channel is P, where 20 ≤ P ≤ 80°.

[0014] In one embodiment, the projections of two adjacent turbulence portions in the airflow direction partially overlap;

[0015] And / or, the number of the flow-disrupting parts is 4 to 10.

[0016] In one embodiment, the minimum flow cross-sectional area of ​​the turbulence channel is S1, and the flow cross-sectional area at the inlet end of the turbulence channel is S2, where S1:S2 = 0.4~0.8.

[0017] In one embodiment, in the airflow direction, the length of the ejector channel is L0, the distance between the inlet end of the turbulence channel and the inlet end of the ejector channel is L1, the length of the turbulence channel is L2, and the length of the turbulence section is L3; 0.25≤L1:L0≤0.75, and / or, 0.1≤L2:L0≤0.25, and / or, 0.5≤L3:L2≤1.

[0018] In one embodiment, along the airflow direction, the downstream ends of all the turbulence sections are located in the same plane perpendicular to the centerline of the ejector channel, and the upstream ends of all the turbulence sections are located in the same plane perpendicular to the centerline of the ejector channel.

[0019] In one embodiment, the turbulence structure includes a turbulence protrusion formed by inwardly pressing the ejector portion, the turbulence protrusion surrounding the ejector channel, and one end of the turbulence portion near the air inlet end of the ejector channel being formed by inwardly pressing the turbulence protrusion.

[0020] In one embodiment, the turbulence protrusion includes a constricted ring, a main ring, and an expanded ring connected along the airflow direction. The constricted ring is gradually narrowed along the airflow direction, and the expanded ring is gradually widened along the airflow direction. In the airflow direction, the end of the turbulence portion near the air inlet end of the ejector channel is formed by stamping the main ring.

[0021] In one embodiment, the orthographic projection of the turbulence portion is located inside the orthographic projection of the main body ring portion in a projection plane perpendicular to the thickness direction of the fire bar.

[0022] In one embodiment, the inner wall of the main ring portion is provided with an annular protrusion protruding in the direction toward the center line. The annular protrusion is located downstream of the turbulence portion, and the height of the annular protrusion protruding relative to the inner wall of the main ring portion is less than or equal to the height of the turbulence portion protruding relative to the inner wall of the main ring portion.

[0023] The second technical problem mentioned above is solved by the following technical solution:

[0024] A burner comprising a fire bar as described above.

[0025] Compared with the prior art, the burner described in this invention has the following advantages: by adopting the above-mentioned burner, the uniformity of gas and air mixing in the burner can be improved, thereby improving combustion stability and reliability, and enhancing the user experience of the burner.

[0026] The third technical problem mentioned above is solved by the following technical solution:

[0027] A gas-fired water heater includes a burner as described above.

[0028] Compared with the prior art, the gas-fired water heater of the present invention has the following advantages: by adopting the above-mentioned burner, the stability and reliability of the gas-fired water heater can be improved, and the performance of the gas-fired water heater can be enhanced. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the fire rack provided in one embodiment of the present invention;

[0030] Figure 2 This is a front view of the firebox provided in Embodiment 1 of the present invention;

[0031] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0032] Figure 4 This is a longitudinal sectional view of the fire bar provided in Embodiment 1 of the present invention;

[0033] Figure 5 for Figure 4 A magnified view of a section at point I;

[0034] Figure 6 This is a bottom view of the fire bar structure provided in Embodiment 1 of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of the fire briquette provided in Embodiment 2 of the present invention;

[0036] Figure 8 This is a front view of the firebox provided in Embodiment 2 of the present invention;

[0037] Figure 9 This is a cross-sectional view of the fire bar provided in Embodiment 2 of the present invention;

[0038] Figure 10 for Figure 9 A magnified view of a section at point J;

[0039] Figure 11 This is a schematic diagram of the structure of the fire bar provided in Embodiment 3 of the present invention;

[0040] Figure 12 This is a front view of the firebox provided in Embodiment 3 of the present invention;

[0041] Figure 13 This is a cross-sectional view of the fire bar provided in Embodiment 3 of the present invention;

[0042] Figure 14 for Figure 13 A magnified view of a section at point K;

[0043] Figure 15 This is a schematic diagram of the structure of the fire bar provided in Embodiment 4 of the present invention;

[0044] Figure 16 This is a front view of the firebox provided in Embodiment 4 of the present invention;

[0045] Figure 17 This is a cross-sectional view of the fire bar provided in Embodiment 4 of the present invention;

[0046] Figure 18 for Figure 17 A magnified view of the area at point L.

[0047] Label Explanation:

[0048] 100. Flame dam body; 200. Flame stabilizer plate; 300. Flame stabilizer channel;

[0049] 10. Ejector section; 20. Flow equalization section; 201. Flow equalization cavity; 202. Flow equalization molding; 30. Head; 301. Main flame channel; 40. Flame orifice plate; 401. Main flame orifice;

[0050] 1. Ejector channel; 11. Retractor channel section; 12. Main channel section; 121. Baffle channel section; 13. Inlet port section.

[0051] 2. Turbation structure; 21. Turbation part; 211. Guide sidewall; 212. Transition arc surface; 213. Upstream end face; 214. Downstream end face; 22. Turbation convex ring part; 221. Narrowing ring part; 222. Main ring part; 223. Expanding ring part; 23. Annular convex part. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "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 this invention and simplifying the description, 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 limitations on this invention.

[0054] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] Example 1

[0057] This invention provides a burner that can be applied in a burner, which can improve the uniformity of gas and air mixing, enhance the combustion stability of the burner and the burner, and facilitate the thinning of the burner.

[0058] like Figures 1 to 4 As shown, the fire briquette includes an ejector section 10, a flow equalization section 20 and a head 30 connected sequentially from bottom to top along the height direction. The ejector section 10 has an ejector channel 1, the head 30 has a main flame channel 301, and the flow equalization section 20 has a flow equalization cavity 201 that connects the ejector channel 1 and the main flame channel 301.

[0059] In this embodiment, a turbulence structure 2 is provided on the inner wall of the ejector channel 1 protruding along the direction towards the centerline of the ejector channel 1, so that a turbulence channel portion 121 is formed at the location of the turbulence structure 2 in the ejector channel 1; the turbulence structure 2 includes at least two turbulence portions 21 arranged circumferentially along the ejector channel 1, and the turbulence portions 21 are arranged along the airflow direction within the ejector channel 1. Figure 4 The arrow (indicated by the arrow parallel to the axis of the ejector channel 1) extends, and the turbulence section 21 is inclined so that the two ends of the turbulence section 21 are spaced apart in the circumferential direction of the ejector channel 1.

[0060] The burner provided in this embodiment has a turbulence structure 2 protruding from the inner wall of the ejector channel 1 along the direction towards the center line of the ejector channel 1. When the airflow flows through the turbulence channel 121, the airflow near the wall of the turbulence channel 121 will collide with the turbulence structure 2, thereby changing the flow direction and mixing better with the airflow in the central area, improving the mixing effect of air and gas. At the same time, the setting of the turbulence structure 2 can increase the flow resistance of the airflow in the ejector channel 1 and prolong the residence time of the airflow in the ejector channel 1, further improving the mixing effect of air and gas. Furthermore, since the turbulence section 21 extends obliquely along the airflow direction, the airflow forms an upward counterclockwise or clockwise swirling flow under the guidance of the obliquely set turbulence section 21, making the gas and air mix more fully, effectively improving the mixing of gas and air, thereby effectively improving the uniformity of the flame at the burner hole, improving the combustion completeness and combustion efficiency, reducing the harmful substances produced during combustion, and improving the combustion stability and reliability of the burner, which is conducive to the thinning design of the burner.

[0061] Specifically, the ejector channel 1 has a contraction channel section 11 and a main channel section 12 that are connected along the airflow direction. The flow cross-sectional area of ​​the contraction channel section 11 is contracted along the airflow direction. The channel wall of the main channel section 12 is provided with the aforementioned turbulence structure 2 protruding in the direction toward the centerline of the ejector channel 1.

[0062] That is, when the nozzle supplies gas into the firebox, the gas is injected into the contraction channel section 11 through the nozzle. The gas is concentrated in the central area of ​​the contraction channel section 11 and can draw in surrounding air. The surrounding air is distributed around the gas, so that the air entering the ejection channel 1 can flow towards the centerline of the ejection channel 1 under the guidance and collision of the wall of the contraction channel section 11, and mix with the gas concentrated in the central area of ​​the contraction channel section 11, improving the mixing effect of air and gas. As the gas and air continue to flow into the main channel section 12, the air and gas are mixed more fully under the action of the turbulence structure 2.

[0063] It is worth noting that the contraction setting of the contraction channel section 11 along the airflow direction specifically means that when the channel wall of the contraction channel section 11 is a smooth channel wall, the flow cross-sectional area of ​​the contraction channel section 11 gradually decreases along the airflow direction; when the channel wall of the contraction channel section 11 is provided with fluid disturbance structures such as grooves and protrusions, the flow cross-sectional area of ​​the portion of the contraction channel section 11 without fluid disturbance structures gradually decreases along the airflow direction.

[0064] In one embodiment, the flow cross-sectional area of ​​the contraction channel section 11 gradually decreases along the airflow direction, thereby reducing the processing difficulty of the contraction channel section 11 and reducing the processing difficulty and cost of the burner.

[0065] Furthermore, the ejector channel 1 also includes an air inlet port 13 connected to the front end of the constriction channel section 11. The flow cross-sectional area of ​​the air inlet port 13 is equal everywhere along the airflow direction and is equal to the maximum flow cross-sectional area of ​​the constriction channel section 11. By providing the air inlet port 13, it is beneficial to achieve the cooperation between the burner and the external structure.

[0066] It is worth noting that the specific parameter settings of the air intake port section 13 and the retraction channel section 11 can be set with reference to the prior art. This is not the focus of this invention, and this invention will not limit or elaborate on it.

[0067] In one embodiment, the main channel section 12 is extended along the airflow direction, that is, the main channel section 12 includes a diffuser section. Specifically, the diffuser section's extension along the airflow direction means that when the channel wall of the diffuser section is smooth, the flow cross-sectional area of ​​the diffuser section gradually increases along the airflow direction; when the channel wall of the diffuser section has airflow disturbance structures such as grooves or protrusions, the flow cross-sectional area of ​​the portion of the diffuser section without airflow disturbance structures gradually decreases along the airflow direction.

[0068] Furthermore, the cross-sectional area of ​​the main channel section 12 gradually increases along the airflow direction, and the minimum cross-sectional area of ​​the main channel section 12 is equal to the minimum cross-sectional area of ​​the contraction channel section 11. This allows for deceleration and diffusion of the mixed airflow exiting the contraction channel section 11, reducing the airflow velocity exiting the main channel section 12, increasing the airflow pressure, and thus reducing kinetic energy loss. Simultaneously, this design simplifies the structure of the main channel section 12, reduces its processing difficulty, and consequently lowers the processing cost of the firebox.

[0069] In another embodiment, the main channel section 12 is a mixing section, meaning that the flow cross-sectional area of ​​the mixing section is equal everywhere where the turbulence structure 2 is not provided. In yet another embodiment, the main channel section 12 includes a mixing section and a diffuser section connected along the airflow direction, with the turbulence section 21 located between the mixing section and the diffuser section, or located on either the mixing section or the diffuser section. The flow cross-sectional area of ​​the mixing section is the same along the airflow direction and equal to the minimum flow cross-sectional area of ​​the contraction channel section 11, while the flow cross-sectional area of ​​the diffuser section gradually increases along the airflow direction, and the minimum flow cross-sectional area of ​​the diffuser section is equal to the maximum flow cross-sectional area of ​​the contraction channel section 11.

[0070] In one embodiment, the minimum flow cross-sectional area of ​​the turbulence channel section 121 is smaller than the minimum flow cross-sectional area of ​​the contraction channel section 11, thereby enhancing the airflow acceleration and airflow collision effects, improving the airflow disturbance effect, and thus enhancing the mixing effect of gas and air.

[0071] It is worth noting that when the flow cross-sectional area of ​​a certain channel mentioned above or below is equal, gradually increases or gradually decreases along the airflow direction, it refers to the cross-sectional area of ​​the main body of the channel. That is, if the wall of the channel is a smooth wall, then the trend of the change of the flow cross-sectional area of ​​the channel is the trend of the change of the flow cross-sectional area of ​​the main structure. If the wall of the channel is provided with micro airflow disturbance structures such as protrusions or grooves, then the change of the flow cross-sectional area of ​​the main structure of the channel does not take into account the abrupt effect of the airflow disturbance structure on the flow cross-sectional area.

[0072] The ejector section 10 has a tubular ejector tube structure, and an ejector channel 1 is formed inside the ejector tube structure. To improve the processing convenience of the turbulence section 21, in one embodiment, the turbulence section 21 is formed by stamping inward from the outer wall surface of the ejector channel 1, thereby reducing the processing difficulty of the turbulence section 21 and improving the processing effect; at the same time, using stamping to form the turbulence section 21 can enhance the overall structural strength and rigidity of the ejector tube structure, reduce the probability of deformation of the ejector tube structure, and improve the setting stability of the ejector section 10.

[0073] like Figures 2 to 6As shown, in one embodiment, in the projection plane perpendicular to the thickness direction of the fire bar, the angle of inclination of the extension direction of the turbulence section 21 relative to the centerline of the ejector channel 1 is P, where 20°≤P≤80°. When the angle P is small, the turbulence section 21 extends basically along the airflow direction, and the swirling effect formed by the airflow passing through the turbulence section 21 is weak. However, when the angle P is large, the resistance to the upward flow of the airflow passing through the turbulence section 21 increases. Therefore, setting P between 20° and 80° can reduce resistance loss while ensuring the formation of a swirling effect. Further, 20°≤P≤45°.

[0074] In one embodiment, the height of the turbulence-disrupting part 21 protruding from the wall of the main channel section 12 gradually increases along the airflow direction. That is, the turbulence-disrupting part 21 has a downstream end and an upstream end positioned opposite each other, with the downstream end being further away from the converging channel section 11 than the upstream end. The height of the turbulence-disrupting part 21 protruding from the wall of the main channel section 12 gradually increases from the upstream end to the downstream end. This arrangement increases the probability of collision between the airflow and the turbulence-disrupting part 21, better guiding the airflow towards the center of the ejector channel 1, and further improving the uniformity of air and fuel mixing. In another embodiment, the height of the turbulence-disrupting part 21 protruding from the wall of the main channel section 12 can also be equal everywhere.

[0075] The minimum flow cross-sectional area of ​​the turbulence channel section 121 is S1, and the flow cross-sectional area at the inlet end of the turbulence channel section 121 is S2. In one embodiment, S1:S2 = 0.4~0.8. When the ratio of S1 to S2 is large, it indicates that S1 is large, meaning that the height of the turbulence section 21 protruding from the channel wall of the main channel section 12 is small, which can easily lead to poor mixing enhancement effect. When the ratio of S1 to S2 is small, it indicates that the size of S1 is small, which can easily lead to the minimum flow cross-sectional area of ​​the turbulence channel section 121 being too small, resulting in excessive resistance loss, which in turn leads to a reduction in the ejector capacity of the ejector section 10, and consequently, insufficient primary air intake, resulting in high flue gas content and insufficient combustion completeness. Therefore, setting the ratio of S1 to S2 between 0.4 and 0.8 can better ensure the uniformity of gas and air mixing and ensure the ejector capacity of the ejector channel 1, thereby improving combustion completeness and combustion stability, and reducing the content of flue gas generated by combustion. The ratio of S1 to S2 can be, but is not limited to, 0.4, 0.5, 0.6, 0.7, or 0.8.

[0076] In one embodiment, along the airflow direction, the length of the ejector channel 1 is L0, and the distance between the inlet end of the turbulence channel section 121 and the inlet end of the ejector channel 1 is L1, where L1:L0 = 0.25~0.75.

[0077] When the length of the ejector channel 1 remains constant, a larger ratio of L1 to L0 indicates a larger L1 and a smaller distance between the turbulence channel section 121 and the outlet of the ejector channel 1. When L1 is large, the turbulence channel section 121 is close to the outlet of the ejector channel 1, which easily leads to a turbulent state in the gas-air mixture as it flows out of the ejector channel 1. This is not conducive to the uniform distribution of gas in the flow equalization chamber 201, and thus is not conducive to the uniformity and stability of the gas flow out of the burner. When L1 is small, the mixed gas flow from the contraction channel section 11 is prone to flow directly towards the central region of the turbulence channel section 121 without sufficient diffusion, thereby reducing the probability of the gas flow towards the turbulence channel section 121 colliding with the chamber wall, and thus weakening the effect of enhancing the mixing of gas and air. Specifically, L1:L0 can be, but is not limited to, 0.25, 0.3, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, or 0.75, etc.

[0078] In one embodiment, the length of the turbulence channel 121 along the height direction of the burner is L2, where L2:L0 = 0.1~0.25. This arrangement avoids the problem of insufficient primary air injection and incomplete combustion caused by a large length of the turbulence channel 121 leading to high gas flow resistance. Simultaneously, this arrangement also avoids the problem of insufficient airflow disturbance caused by an excessively small length of the turbulence channel 121. Specifically, L2:L0 can be, but is not limited to, 0.1, 0.15, 0.2, or 0.25.

[0079] In one embodiment, the length of the turbulence-dispersing portion 21 along the height direction of the fire bar is L3, where 0.5 ≤ L3 and L2 ≤ 1. This ensures that the length of the turbulence-dispersing channel portion 121 remains constant, preventing the turbulence-dispersing portion 21 from being too short and resulting in poor swirl formation.

[0080] In one embodiment, along the airflow direction, the downstream ends of all the turbulence sections 21 are located in the same plane perpendicular to the centerline, and the upstream ends of all the turbulence sections 21 are located in the same plane perpendicular to the centerline. The main channel section 12 forms the turbulence channel section 121 in the area between the downstream plane and the upstream plane, i.e., L3=L2. That is, the turbulence structure 2 only includes multiple circumferentially distributed turbulence sections 21, thereby simplifying the structure of the turbulence structure 2 and reducing processing costs. At the same time, this arrangement can increase the height of the turbulence section 21 without changing the minimum flow cross-sectional area of ​​the turbulence channel section 121, thereby improving the ability of the turbulence section 21 to form swirling flow and more effectively improving the mixing effect of gas and air. The downstream end of the turbulence section 21 is the end of the turbulence section 21 that is away from the air inlet end of the ejector channel 1.

[0081] In one embodiment, the projections of two adjacent turbulence-disrupting parts 21 in the airflow direction partially overlap, thereby further enhancing the swirling effect generated when the airflow passes through the two adjacent turbulence-disrupting parts 21. In other embodiments, the two adjacent turbulence-disrupting parts 21 may also be staggered in the airflow direction.

[0082] The number of flow-dispersing parts 21 arranged circumferentially along the ejector channel 1 is 4-10. This is to avoid the problems of increased processing difficulty, increased processing cost, and increased flow resistance due to an excessive number of flow-dispersing parts 21, while also avoiding the problem of weak flow mixing effect due to a small number of flow-dispersing parts 21. This ensures the mixing effect while avoiding a large increase in resistance, and reduces processing difficulty and processing cost. More preferably, the number of flow-dispersing parts 21 is 5-8.

[0083] The turbulence section 21 has two guide sidewalls 211 arranged opposite each other in the circumferential direction of the ejector section 10 and a transition arc surface 212 connecting the two guide sidewalls 211. The transition arc surface 212 protrudes in the direction toward the center of the ejector channel 1, thereby improving the smoothness of airflow along the turbulence section 21, avoiding the probability of airflow generating vortices at the turbulence section 21, and also reducing the processing difficulty of the turbulence section 21.

[0084] The turbulence section 21 also has a downstream end face 214 forming the downstream end of the turbulence section 21. The downstream end face 214 is smoothly connected to the guide sidewall 211 and the transition arc surface 212 using a circular arc structure. The downstream end face 214 extends obliquely away from the inner wall of the main channel section 12 along the airflow direction to guide the airflow upward. The turbulence section 21 also has an upstream end face 213 forming the upstream end of the turbulence section 21. The upstream end face 213 is smoothly connected to the guide sidewall 211 and the transition arc surface 212 using a circular arc structure. The upstream end face 213 extends obliquely towards the inner wall of the main channel section 12 along the airflow direction to better guide the airflow out of the turbulence section 21.

[0085] In one embodiment, the ejector channel 1 is vertically arranged, that is, the airflow direction is vertically upward. The lower port of the ejector channel 1 forms the air inlet of the ejector channel 1, and the upper port of the ejector channel 1 forms the air outlet of the ejector channel 1. The burner is a T-shaped burner. There may be only one ejector channel 1, or there may be two or more arranged at intervals along the width direction of the burner.

[0086] In another embodiment, the ejector channel 1 is L-shaped, meaning that the air inlet of the ejector channel 1 faces one side of the burner along the width direction, and the burner is a C-shaped burner. There may be only one ejector channel 1, or two may be spaced apart along the width direction of the burner, with the air inlets of the two ejector channels 1 facing each other and spaced apart.

[0087] like Figure 1 and Figure 3 As shown, in one embodiment, the fire grate includes a fire grate body 100 and a flame stabilizer plate 200. The fire grate body 100 has an ejector section 10, a flow equalization section 20 and a head 30 connected in sequence. Flame stabilizers 200 are provided on opposite sides of the head 30 along the thickness direction of the fire grate. Each flame stabilizer plate 200 and the fire grate body 100 form a flame stabilizing channel 300. Ventilation holes are provided on opposite sides of the head 30. The ventilation holes are connected to the main flame channel 301 and the flame stabilizing channel 300.

[0088] A vent is provided to connect the flame stabilizing channel 300 and the main flame channel 301, allowing some of the gas in the main flame channel 301 to flow through the vent to the flame stabilizing channel 300. This forms a stable flame at the upper end of the flame stabilizing channel 300, thereby reducing the gas flow velocity at the main burner hole 401. This avoids the situation where the gas flow velocity is too high due to the thinning of the water heater while maintaining the same gas flow rate, which would affect combustion stability. At the same time, the gas in the flame stabilizing channel 300 is diverted away from the main flame channel 301, so the gas flow velocity in the flame stabilizing channel 300 is lower than that in the main flame channel 301. This allows the stable flame at the upper end of the flame stabilizing channel 300 to effectively stabilize the main flame at the main burner hole 401, further improving combustion stability.

[0089] In one embodiment, a flame perforation plate 40 is connected to the top of the head 30. The flame perforation plate 40 is horizontally arranged and has a main flame hole 401. The flame grid body 100 is integrally formed to reduce the processing difficulty and cost of the flame grid body 100, thereby reducing the processing difficulty and cost of the flame grid. In other embodiments, the flame grid may include an inner core with an inverted U-shaped cross-section. The inner core is inserted into the main flame channel 301, and the top of the inner core has the aforementioned main flame hole 401.

[0090] In one embodiment, the flame stabilizer plate 200 has a protruding portion extending away from the burner body 100, which together with the burner body 100 forms a flame stabilizing channel 300. This facilitates the forming of the flame stabilizing channel 300 and reduces the processing and assembly difficulty of the burner. The portion of the flame stabilizer plate 200 without the protruding portion fits snugly against the burner body 100, ensuring that the flame stabilizing channel 300 is only open at the top.

[0091] In one embodiment, the flame hole plate 40 is provided with multiple flame hole groups spaced apart along the width direction of the fire row. Each flame hole group is provided with multiple main flame holes 401. In the width direction of the fire row, flame stabilizing channels 300 are provided one-to-one with the flame hole groups, so that the flame stabilizing flame at the upper end of each flame stabilizing channel 300 stabilizes the flame of the corresponding group of main flame holes 401, which is conducive to realizing grouped combustion of flames and to realizing combustion heat dissipation. Specifically, the protruding parts are provided one-to-one with the flame stabilizing channels 300.

[0092] To further improve the uniformity of the mixed gas flow in the thickness direction of the burner, the flow equalization section 20 has flow equalization pressure profiles 202 formed by inward pressing on opposite sides. The flow equalization pressure profiles 202 extend at least at their upper ends along the width direction of the burner. The arrangement of the flow equalization pressure profiles 202 creates a relatively narrow flow equalization channel in the portion of the flow equalization chamber 201 located between the two oppositely arranged flow equalization pressure profiles 202. This increases the resistance to the gas flow into the flow equalization channel, reduces the gas flow rate into the flow equalization channel, and guides the gas flow from the ejector channel 1 to flow along both sides in the width direction. This avoids the problem of low gas flow rates at both ends in the width direction caused by the gas flow from the ejector channel 1 flowing directly upwards out of the flow equalization chamber 201, thus improving the consistency of gas flow rate in the width direction of the burner.

[0093] In one embodiment, the flow equalization pressure type 202 is preferably arranged in an inverted triangle, with the lower tip of the inverted triangle facing the gas outlet end of the ejector channel 1, so as to improve the flow equalization pressure type 202's effect on the gas flow. In other embodiments, the flow equalization pressure type 202 may also be a long strip structure extending along the width direction of the burner.

[0094] It is worth noting that other structures of the fire duct can be set with reference to existing technology, which is not the focus of this invention and will not be described in detail in this embodiment.

[0095] This embodiment also provides a burner including multiple burners arranged side-by-side as described above, with the multiple burners arranged side-by-side along the thickness direction of the burners. The burner provided in this embodiment, by employing the aforementioned burners, can improve the uniformity of mixing of fuel gas and air within the burners, thereby improving combustion stability and reliability, and enhancing the user experience of the burners.

[0096] This embodiment also provides a gas-fired water heater, including the burner described above. By employing the burner described above, the gas-fired water heater provided in this embodiment can improve the stability and reliability of its operation, thereby enhancing its performance.

[0097] Example 2

[0098] This embodiment provides a fire bar and a burner containing the fire bar. The basic structure of the fire bar provided in this embodiment is the same as that in Embodiment 1, with only some differences in the configuration. This embodiment will not describe the structure that is the same as that in Embodiment 1 again.

[0099] like Figures 7 to 10 As shown, in this embodiment, the turbulence structure 2 includes a turbulence protrusion 22 formed by pressing the ejector portion inward. The turbulence protrusion 22 is arranged around the ejector channel 1, and one end of the turbulence portion 21 near the air inlet end of the ejector channel 1 is formed by pressing the turbulence protrusion 22 inward.

[0100] In this embodiment, the turbulence structure 2 includes a turbulence protrusion 22 and a turbulence section 21, wherein the minimum distance between the turbulence protrusion 22 and the centerline is greater than the minimum distance between the turbulence section 21 and the centerline. This arrangement causes the airflow, when flowing through the turbulence channel section 121, to first collide with the inner wall of the turbulence protrusion 22 and change its flow direction. Then, during its upward flow, it collides with the turbulence section 21 and changes its direction again, simultaneously forming a swirling flow. This results in the airflow undergoing multiple changes in direction and speed as it flows through the turbulence channel section 121, further improving the mixing effect of air and fuel gas, enhancing combustion completeness, and reducing harmful substances produced during combustion.

[0101] In this embodiment, the turbulence protrusion ring 22 includes a constricted ring 221, a main ring 222, and a flared ring 223 connected sequentially along the airflow direction. The constricted ring 221 is gradually constricted along the airflow direction, and the flared ring 223 is gradually expanded along the airflow direction. In the airflow direction, the end of the turbulence part 21 near the air inlet end of the ejector channel 1 is formed by stamping the main ring 222. This configuration causes the cross-sectional area of ​​the ejector channel 1 within the turbulence-enlarging ring 22 to gradually decrease at the inlet and increase at the outlet. This allows the constricted ring 221 to increase the airflow velocity and change the airflow direction, thereby increasing the degree of collision between the airflow and the turbulence-enlarging ring 21. This better guides the airflow from the wall towards the center of the ejector channel 1, improving the mixing effect of the fuel gas and air. The flared ring 223 better restores the fluid pressure and flow direction exiting the turbulence-enlarging ring 121 and increases the number of collisions between the fluid and the ejector channel 1 wall, further improving mixing uniformity. In other embodiments, the turbulence-enlarging ring 22 may consist only of the constricted ring 221 and the flared ring 223.

[0102] The flow cross-sectional area of ​​the main ring portion 222 is smaller than the maximum flow cross-sectional area of ​​the constricted ring portion 221 and smaller than the maximum flow cross-sectional area of ​​the flared ring portion 223, so as to maximize the airflow velocity in the main ring portion 222. In one embodiment, the flow cross-sectional area of ​​the main ring portion 222 is equal everywhere along the airflow direction, so as to reduce the processing difficulty of the turbulence protruding ring portion 22 and improve the processing convenience of the turbulence protruding ring portion 22.

[0103] In other embodiments, the main ring portion 222 may be tapered along the airflow direction, and the inclination angle of the channel wall of the main ring portion 222 relative to the center line is smaller than the inclination angle of the channel wall of the constricted ring portion 221 relative to the center line. In yet another embodiment, the main ring portion 222 may be gradually widened along the airflow direction, and the inclination angle of the inner wall of the main ring portion 222 relative to the center line is smaller than the inclination angle of the inner wall of the flared ring portion 223 relative to the center line.

[0104] In this embodiment, the orthographic projection of the turbulence-disrupting part 21 is located inside the orthographic projection of the main body ring part 222 in a projection plane perpendicular to the thickness direction of the burner. This reduces the processing difficulty of the turbulence-disrupting structure 2 and thus reduces the processing cost of the burner. Furthermore, the two ends of the turbulence-disrupting part 21 are spaced apart from the corresponding ends of the main body ring part 222. That is, the turbulence-disrupting channel part 121 is a channel located between the inlet end and the outlet end of the turbulence-disrupting convex ring part 22.

[0105] In this embodiment, the maximum height of the turbulence protrusion 22 protruding relative to the inner wall of the ejector channel 1 is less than the height of the turbulence protrusion 21 protruding relative to the inner wall of the turbulence protrusion 22. This results in the turbulence channel 121 having the minimum flow cross-sectional area at the location where the turbulence protrusion 21 is provided, so as to ensure the turbulence effect of the turbulence channel 121 while reducing the protrusion height of the turbulence protrusion 22. At the same time, this arrangement can avoid the turbulence protrusion height of the turbulence protrusion 21 being too small to form an effective vortex.

[0106] The angle between the channel wall of the constriction ring 221 and the centerline is Q, where Q ≥ 30°. Generally, the larger Q is, the faster the cross-section of the constriction ring 221 changes, i.e., the greater the rate of change of the flow cross-sectional area, the better the disturbance effect on the airflow, and the better the mixing effect of the gas and air. Therefore, setting Q to be greater than 30° can more effectively ensure the disturbance effect on the airflow, thereby improving the mixing effect. Furthermore, 30° ≤ Q ≤ 80° to avoid the problem that if Q is too large, the channel wall of the constriction ring 221 will be nearly perpendicular to the centerline of the ejector channel 1, resulting in a large increase in the backward flow resistance of the airflow. At the same time, it also avoids the problem that if Q is too large, the length of the constriction ring 221 will be too small, thereby increasing the processing difficulty of the turbulence channel 121.

[0107] In one embodiment, the channel wall of the flared ring 223 is inclined relative to the centerline of the turbulence channel 121, and the angle between the channel wall of the flared ring 223 and the centerline is M, where M ≥ 15°. Generally, the larger M is, the faster the cross-section of the flared ring 223 changes, that is, the greater the rate of change of the flow cross-sectional area, the better the turbulence effect on the airflow, and the better the mixing effect of the gas and air. Therefore, setting M to be greater than 15° can more effectively ensure the airflow turbulence effect. At the same time, a relatively large M can shorten the length of the flared ring 223, so that the pressure of the mixed airflow can be quickly restored, avoiding the problem of insufficient ejection capacity of the ejector channel 1 due to excessive length of the turbulence channel 121. Further, 15° ≤ M ≤ 80°.

[0108] In one embodiment, the constricted ring 221 is connected to the main ring 222 and the main channel wall of the ejector channel 1 by a rounded transition to improve airflow smoothness; and / or, the flared ring 223 is connected to the main channel section 12 and the channel wall of the main ring 222 by a rounded transition to improve airflow smoothness. In other embodiments, the wall surfaces of the constricted ring 221 and / or the flared ring 223 may also be rounded surfaces.

[0109] This embodiment also provides a gas-fired water heating device, including the burner described above. The gas-fired water heating device provided in this embodiment can improve combustion stability and reliability, and enhance combustion efficiency.

[0110] Example 3

[0111] This embodiment provides a fire bar and a burner containing the fire bar. The basic structure of the fire bar provided in this embodiment is basically the same as that in Embodiment 2, with only some differences in the configuration. This embodiment will not describe the structure that is the same as that in Embodiment 2 again.

[0112] like Figures 11 to 14 As shown, in this embodiment, in the airflow direction, the upstream end of the turbulence-disrupting part 21 is located between the two ends of the main ring part 222, and the downstream end of the turbulence-disrupting part 21 is located downstream of the turbulence-disrupting convex ring part 22. This arrangement allows the turbulence-disrupting part 21 to cross the downstream end of the turbulence-disrupting convex ring part 22 in the airflow direction, thereby increasing the airflow disturbance effect and reducing the size requirements of the turbulence-disrupting convex ring part 22 in the airflow direction.

[0113] It is worth noting that the downstream ends of all the turbulence sections 21 are located on the plane downstream of the center line of the vertical ejector channel 1, the plane where the inlet end of the turbulence convex ring section 22 is located is the upstream plane, and the part of the ejector channel 1 located between the downstream plane and the upstream plane forms the turbulence channel section 121.

[0114] In this embodiment, the length of the flared ring portion 223 in the airflow direction is greater than the length of the main ring portion 222 in the airflow direction. In other embodiments, the length of the flared ring portion 223 in the airflow direction may be less than or equal to the length of the main ring portion 222 in the airflow direction.

[0115] This embodiment also provides a gas-fired water heating device, including the burner described above. The gas-fired water heating device provided in this embodiment can improve combustion stability and reliability, and enhance combustion efficiency.

[0116] Example 4

[0117] This embodiment provides a fire bar and a burner containing the fire bar. The basic structure of the fire bar provided in this embodiment is basically the same as that in Embodiment 2, with only some differences in the settings. This embodiment will not repeat the same structure as in Embodiment 2.

[0118] like Figures 15 to 18 As shown, in this embodiment, in a projection plane perpendicular to the thickness direction of the fire bar, the orthographic projection of the turbulence-disrupting part 21 is located inside the orthographic projection of the main body ring part 222. An annular protrusion 23 protrudes from the inner wall of the main body ring part 222 along the direction towards the center line of the ejector channel 1. The annular protrusion 23 is located downstream of the turbulence-disrupting part 21, and the height of the annular protrusion 23 relative to the inner wall of the main body ring part 222 is less than or equal to the height of the turbulence-disrupting part 21 relative to the inner wall of the main body ring part 222.

[0119] By setting the main ring 222, the airflow flowing out of the turbulence section 21, especially the airflow flowing out between two adjacent turbulence sections 21, can further collide with the inner wall of the annular protrusion 23, thereby changing the airflow speed and direction and improving the airflow mixing effect. Furthermore, the airflow flowing out of the main ring 222 can change its direction and speed again when flowing through the flared ring 223, further improving the gas and air mixing effect.

[0120] In this embodiment, the annular protrusion 23 and the flared ring 223 are spaced apart to increase the probability of airflow colliding with the channel wall of the ejector channel 1. In other embodiments, the downstream end of the flared ring 223 can be directly connected to the upstream end of the annular protrusion 23, so that the airflow exiting the annular protrusion 23 flows directly to the flared ring 223.

[0121] In this embodiment, the length of the main ring portion 222 in the airflow direction is L4, and 0.7≤L4 / L2≤0.95, so as to facilitate the setting of the annular protrusion 23 and the turbulence portion 21 on the main ring portion 222.

[0122] In the specific embodiments described above, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the technical features are described. However, as long as the combinations of these technical features are not contradictory, they should be considered within the scope of this specification. The specific embodiments described above only illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A fire briquette, comprising an ejector section (10) having an ejector channel (1), characterized in that, The ejector channel (1) is circumferentially closed and has a contraction channel section (11) and a main channel section (12) connected along the airflow direction. The flow cross-sectional area of ​​the contraction channel section (11) is contracted along the airflow direction. The inner wall of the main channel section (12) is provided with a turbulence structure (2) protruding along the direction towards the center line of the ejector channel (1), so that the ejector channel (1) forms a turbulence channel section (121) at the location of the turbulence structure (2). The turbulence structure (2) includes at least two turbulence sections (21) arranged circumferentially along the ejector channel (1). The turbulence sections (21) extend along the airflow direction in the ejector channel (1), and the turbulence sections (21) are arranged at an angle so that the two ends of the turbulence sections (21) are arranged circumferentially along the ejector channel (1). The turbulence section (21) and the contraction channel section (11) are spaced apart in the airflow direction, and in the airflow direction, the length of the ejector channel (1) is L0, and the distance between the inlet end of the turbulence section (121) and the inlet end of the ejector channel (1) is L1, 0.25≤L1:L0≤0.75; The height of the turbulence section (21) protruding from the inner wall of the ejector channel (1) gradually increases along the airflow direction.

2. The fire grill according to claim 1, characterized in that, In the projection plane perpendicular to the thickness direction of the fire bar, the angle between the extension direction of the turbulence section (21) and the center line of the ejector channel (1) is P, 20≤P≤80°.

3. The fire grill according to claim 1, characterized in that, The projections of two adjacent turbulence elements (21) in the airflow direction partially overlap; And / or, the number of the turbulence-disrupting parts (21) is 4 to 10.

4. The fire grill according to claim 1, characterized in that, The minimum flow cross-sectional area of ​​the turbulence channel section (121) is S1, and the flow cross-sectional area of ​​the inlet end of the turbulence channel section (121) is S2, where S1:S2 = 0.4~0.

8.

5. The fire grill according to claim 1, characterized in that, The length of the turbulence channel (121) is L2, and the length of the turbulence section (21) is L3; 0.1≤L2:L0≤0.25, and / or, 0.5≤L3:L2≤1.

6. The fire grill according to claim 1, characterized in that, Along the airflow direction, the downstream ends of all the turbulence sections (21) are located in the same plane perpendicular to the center line of the ejector channel (1), and the upstream ends of all the turbulence sections (21) are located in the same plane perpendicular to the center line of the ejector channel (1).

7. The fire rack according to any one of claims 1-6, characterized in that, The turbulence structure (2) includes a turbulence protrusion (22) formed by pressing the ejector inward. The turbulence protrusion (22) is arranged around the ejector channel (1). The end of the turbulence section (21) near the air inlet end of the ejector channel (1) is formed by pressing the turbulence protrusion (22) inward.

8. The fire grill according to claim 7, characterized in that, The turbulence protrusion (22) includes a constricted ring (221), a main ring (222), and a flared ring (223) connected along the airflow direction. The constricted ring (221) is gradually constricted along the airflow direction, and the flared ring (223) is gradually expanded along the airflow direction. In the airflow direction, the end of the turbulence part (21) near the air inlet end of the ejector channel (1) is formed by stamping the main ring (222).

9. The fire grill according to claim 8, characterized in that, In the projection plane perpendicular to the thickness direction of the fire bar, the orthographic projection of the turbulence part (21) is located inside the orthographic projection of the main body ring part (222).

10. The fire grill according to claim 9, characterized in that, The inner wall of the main ring (222) is provided with an annular protrusion (23) protruding in the direction toward the center line. The annular protrusion (23) is located downstream of the turbulence part (21), and the height of the annular protrusion (23) protruding relative to the inner wall of the main ring (222) is less than or equal to the height of the turbulence part (21) protruding relative to the inner wall of the main ring (222).

11. A burner, characterized in that, Includes the fire rack as described in any one of claims 1-10.

12. A gas-fired hot water device, characterized in that, Including the burner as described in claim 11.

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