Burner array and combustion apparatus

Abstract

The present application discloses a combustion grate and a combustion appliance. The combustion grate comprises: a body in which a flow channel is formed; a combustion head comprising a flame spreader plate arranged at a gas outlet of the flow channel, the flame spreader plate being provided with a plurality of combustion fire ports in communication with the flow channel, flanges being provided on a side edge of the flame spreader plate at positions corresponding to part of the combustion fire ports, notches being formed between at least part of the flanges and a side edge of a corresponding combustion fire port; and a metal mesh arranged on the combustion head and disposed opposite to the plurality of combustion fire ports, a part of a side edge of the metal mesh being located on a bottom side of the flanges.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] The present application claims benefit of Chinese Patent Application No. 202323209410.0 filed on November 23, 2023, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD

[0002] The present application relates to the technical field of gas appliance, and particularly to a combustion grate and a combustion appliance.BACKGROUND

[0003] In the related art, in order to reduce the nitrogen oxide content in the combustion exhaust gas of gas water heaters, a full premixed combustion technology, a rich and thin combustion technology and a water-cooled combustion technology are often used. However, due to the high cost and high production technology requirements of these technologies, the selling price of the appliance is also high, and the market acceptance is low, which is not conducive to the wide application of products. In addition to the above low-nitrogen technologies, the low-nitrogen burner with fire holes made of a metal mesh is currently used in products. The fire holes of the combustion grate of this burner are formed by the metal mesh. However, as the combustion area of fire holes made by the metal mesh increases, it is often easy to cause the flame-out and lift-off phenomenon when the wind speed of the fan fluctuates, thereby resulting in problems such as unstable combustion, poor flue gas emission, combustion resonance, and loud noise.SUMMARY

[0004] The main purpose of the present application is to propose a combustion grate that can improve the combustion stability, reduce the combustion noise, reduce the nitrogen oxide emissions, and achieve low-nitrogen combustion.

[0005] In order to achieve the above purpose, the combustion grate of the present application comprises a body, a combustion head and a metal mesh.

[0006] In one embodiment, a flow channel is formed in the body.

[0007] In one embodiment, the combustion head comprises a flame spreader plate arranged at a gas outlet of the flow channel. The flame spreader plate is provided with a plurality of combustion fire ports in communication with the flow channel. Flanges are provided on a side edge of the flame spreader plate at positions corresponding to at least part of the combustion fire ports. Notches are formed between at least part of the flanges and a side edge of a corresponding combustion fire port.

[0008] In one embodiment, the metal mesh is arranged on the combustion head and disposed opposite to the plurality of combustion fire ports, a part of a side edge of the metal mesh is located on a bottom side of the flanges.

[0009] In one embodiment, the plurality of combustion fire ports are arranged at intervals in the length direction of the flame spreader plate, the flanges being provided on two side edges of the flame spreader plate at positions corresponding to all of the combustion fire ports, wherein the two side edges of the flame spreader plate being opposite to each other in a width direction of the flame spreader plate, and the notch being formed between each of the flanges and the side edge of a corresponding combustion fire port.

[0010] In one embodiment, the plurality of combustion fire ports comprise first combustion fire ports and second combustion fire ports, the flanges are provided on two side edges of the flame spreader plate at positions corresponding to all of the first combustion fire ports, wherein the two side edges of the flame spreader plate being opposite to each other in a width direction of the flame spreader plate. Between each of the flanges and the side edge of a corresponding first combustion fire port, the notch being formed.

[0011] In one embodiment, the first combustion fire ports and the second combustion fire ports are arranged alternately and arranged at intervals in a length direction of the flame spreader plate; or, at least two first combustion fire ports are arranged between any two adjacent second combustion fire ports.

[0012] In one embodiment, in a length direction of the flame spreader plate, the flame spreader plate has a middle region and two end regions located at two ends of the middle region, an opening area of each combustion fire port located in either end region is smaller than an opening area of each combustion fire port located in the middle region.

[0013] In one embodiment, the flame spreader plate comprises a plurality of longitudinal ribs arranged at intervals in the length direction of the flame spreader plate, each longitudinal rib extends in a width direction of the flame spreader plate, each combustion fire port is formed between any two adjacent longitudinal ribs, an arrangement density of the longitudinal ribs located in the end regions is greater than the arrangement density of the longitudinal ribs located in the middle region.

[0014] In one embodiment, a plurality of the combustion fire ports located in a middle region of the flame spreader plate are arranged in at least one row, each row of the combustion fire ports comprises third combustion fire ports and fourth combustion fire ports alternately arranged in a length direction of the flame spreader plate, an opening area of each third combustion fire port is larger than an opening area of each fourth combustion fire port.

[0015] In one embodiment, at least two rows of the combustion fire ports are provided in the middle region of the flame spreader plate. The at least two rows of the combustion fire ports comprises a first row of the combustion fire ports and a second row of the combustion fire ports, which are disposed adjacent to each other in a width direction of the flame spreader plate. Both the first row of the combustion fire ports and the second row of the combustion fire ports comprise third combustion fire ports and fourth combustion fire ports alternately arranged in the length direction of the flame spreader plate. The third combustion fire ports in the first row are disposed opposite to the fourth combustion fire ports in the second row.

[0016] In one embodiment, the flame spreader plate comprises a plurality of transverse ribs arranged in the length direction of the flame spreader plate, each of the transverse ribs extends in the length direction of the flame spreader plate. Any two adjacent transverse ribs are staggered in a width direction of the flame spreader plate. The third combustion fire ports and the fourth combustion fire ports adjacent in the width direction of the flame spreader plate are separated by the transverse ribs.

[0017] In one embodiment, the side edge of at least part of the combustion fire ports is provided with protrusions and / or grooves.

[0018] In one embodiment, the combustion head further comprises two side plates arranged on two sides of the flame spreader plate in a width direction of the flame spreader plate. Both of the side plates are bent towards an interior of the flow channel with respect to the flame spreader plate. A main gas outlet channel is formed between the two adjacent side plates, the main gas outlet channel communicates the flow channel with the plurality of combustion fire ports. A lateral gas outlet channel in communication with the flow channel is formed between a side of each side plate facing away from another side plate and the body. A side of the lateral gas outlet channel facing away from the flow channel is opened to form a flame stabilizing opening.

[0019] In one embodiment, a first flow splitter opening is formed between a side of each side plate facing away from the flame spreader plate and the body, the first flow splitter opening communicates the flow channel with the lateral gas outlet channel.

[0020] In one embodiment, each side plate is provided with a second flow splitter opening which communicates the main gas outlet channel with the lateral gas outlet channel.

[0021] In one embodiment, a plurality of lateral protuberances are arranged at intervals in a length direction of the body. The lateral protuberances are arranged on the body at positions opposite to each side plate. The flow channel is formed between each lateral protuberance and the side plate adjacent to the lateral protuberance. The lateral protuberances facing towards the same side plate comprises two end lateral protuberances located at two ends, and middle lateral protuberances located between the two end lateral protuberances. The first flow splitter opening is formed between a side of each side plate facing away from the flame spreader plate and each middle lateral protuberance, the second flow splitter opening is provided on each side plate at positions opposite to the end lateral protuberances and the middle lateral protuberances.

[0022] The present application also proposes a combustion appliance comprising the combustion grate as described above.

[0023] In the technical solution of the present application, by cooperation of the flame spreader plate and the metal mesh, the combustion fire ports on the flame spreader plate are divided into a plurality of fine fire holes by the fine mesh holes of the metal mesh. On the one hand, the present application can increase the combustion area of the combustion grate compared to the strip-shaped fire hole of the traditional combustion grate; on the other hand, the present application can divided the fire hole, avoid the problem of local high temperature of the strip-shaped fire holes, make the temperature of the combustion surface of the combustion grate more uniform, reduce the thermal intensity of the fire holes, and effectively suppress the generation of nitrogen oxides (NOx) , thereby realizing low-nitrogen combustion. In addition, the metal mesh can also prevent safety accidents such as explosion caused by backfire. In addition, flanges are provided on a side edge of the flame spreader plate at positions corresponding to at least part of the combustion fire ports, notches are formed between at least part of the flanges and a side edge of a corresponding combustion fire port; a part of a side edge of the metal mesh is located on a bottom side of the flanges. By leaving the notch between the side edge of the flange and the combustion fire port, the perimeter of the contact contour between the flame and the flame spreader plate is increased, so that the flame is more stably and the combustion noise is reduced. The parts provided with the flanges on the side edge of the flame spreader plate can just cover the uneven parts on the side edge of the metal mesh, so that the consistency of the combustion area of each combustion grate is more stable. In addition, the flange design having the notches can also reduce the impact of flange on the combustion area, which ensures sufficient combustion area, and avoid the increase of CO and NOx in the flue gas caused by the flange extending across the combustion fire port which reduces the combustion area too much. In this way, through the comprehensive action of the above aspects, the combustion stability can be improved, the combustion noise can be reduced, the nitrogen oxide emissions can be reduced, and low-nitrogen combustion can be achieved.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to explain more clearly technical solutions of the embodiments of the present application or the related technology, the drawings for the description of the embodiments and the related technology will be introduced below. Apparently, the drawings in the below description are only for some embodiments of the present application, and other drawings may be acquired based on the structure shown in these drawings by those skilled in the art without creative efforts. FIG. 1 is a schematic view of a combustion grate according to an embodiment of the present application. FIG. 2 is a front view of the combustion grate of FIG. 1. FIG. 3 is a schematic exploded view of the combustion grate in FIG. 1. FIG. 4 is a schematic section view of the combustion grate in FIG. 1. Fig. 5 is an enlarged partial view showing area A of Fig. 4; FIG. 6 is a schematic view of an assembly structure of the combustion head and the metal mesh. FIG. 7 is a top view of a combustion head of an embodiment. FIG. 8 is an enlarged partial view showing area B of Fig. 7. FIG. 9 is a top view of a combustion head of another embodiment. FIG. 10 is a side view of a combustion head of an embodiment. Reference Numerals:

[0025] Reference NumeralElementReference NumeralElement100Combustion Grate211bSecond Combustion Fire Port10Body211cThird Combustion Fire Port101Flow Channel211dFourth Combustion Fire Port102Gas Inlet212Flange103Gas Outlet213Notch11Lateral Protuberance214Longitudinal Rib11aEnd Lateral Protuberance215Transverse Rib11bMiddle Lateral Protuberance216Protrusion20Combustion Head22Side Plate21Flame Spreader Plate221Second Flow Splitter Opening21aMiddle Region201Main Gas Outlet Channel21bEnd Region202Lateral Gas Outlet Channel211Combustion Fire Port203First Flow Splitter Opening211aFirst Combustion Fire Port30Metal Mesh

[0026] The implementation of objectives, functional characteristics and advantages of the present application will be further described with reference to accompanying drawings in combination with embodiments.DETAILED DESCRIPTION

[0027] Hereinafter a clear and complete description will be given for explaining the technical solution in the embodiments of the present application with reference to the drawings of the embodiments of the present application. It should be noted that the described embodiments are only part of and not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0028] It should be noted that directional and positional terms in the embodiments of the present application, such as "upper", "lower", "left", "right", "front" and "rear", are used to explain the relative position relationship and movement of the elements in a specific attitude. It should be understood that these directional terms may correspondingly change when the specific attitude is changed.

[0029] In the embodiments of the present application, the terms "first" and "second" are used merely for descriptive purposes, and are not to be construed as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first", "second" may explicitly or implicitly means that there is at least one said features. In addition, the meaning of the term "and / or" comprises any and all combinations of one or more of the associated listed items. For example, "A and / or B" comprises scheme A, scheme B, or a scheme comprising both A and B. In addition, the technical solutions of the various embodiments may be combined with each other as long as the person of ordinary skill in the art can realize it. If the combination of the technical solutions results in a contradictory or the combination of the technical solutions is impossible to realize, it should be considered that the combination of the technical solutions does not exist and is not within the scope of protection of the present application.

[0030] The present application proposes a combustion grate 100, and aims to improve combustion stability of the combustion grate 100 and combustion appliance comprising the combustion grate 100, reduce combustion noise, reduce nitrogen oxide emission, and realize low-nitrogen combustion by optimizing the structure of the combustion grate 100.

[0031] Referring to FIGS. 1 to 4, in an embodiment of the present application, the combustion grate 100 comprises a body 10, a combustion head 20, and a metal mesh 30. A flow channel 101 is formed inside the body 10. The combustion head 20 comprises a flame spreader plate 21 provided at a gas outlet 103 of the flow channel 101, and the flame spreader plate 21 is provided with a plurality of combustion fire ports 211 in communication with the flow channel 101. At least one flange 212 is provided on the side edge of the flame spreader plate 21 at a position corresponding to a respective one of the combustion fire ports 211, and a notch 213 is formed between at least one of the at least one flange 212 and the side edge of the corresponding combustion fire port 211. The metal mesh 30 is arranged at the combustion head 20 and is opposite to the plurality of combustion fire ports211, and a part of a side edge of the metal mesh 30 is located on the bottom side of the flange 212.

[0032] Referring to FIGS. 3 and 4, the body 10 is the main structure of the combustion grate 100. The flow channel 101 is formed in the body 10. The flow channel 101 has a gas inlet 102 arranged on a side of the body 10 and a gas outlet 103 arranged on the top of the body 10. The body comprises two half-shells spliced together, and the two half-shells together define the flow channel 101. Flow channel 101 may comprise an injection channel in communication with the gas inlet 102, a flow splitter channel in communication with the gas outlet 103, and a curved channel communicating the injection channel and the flow splitter channel. The half-shells can be made of a sheet metal, and be punched to form the corresponding cavity channel, and then the two half-shells can be welded and fixed with each other. The combustion head 20 is generally a sheet metal member arranged at the top of the body 10. The combustion head 20 comprises a flame spreader plate 21 disposed opposite to the gas outlet 103 of the flow channel 101. The flame spreader plate 21 is provided with a plurality of combustion fire ports 211, and the metal mesh 30 is arranged opposite to the plurality of combustion fire ports 211. The shape of the combustion fire port 211 comprises, but is not limited to, a square, a circle, a trapezoid, or other special shapes. The flame spreader plate 21 may comprise a plurality of longitudinal ribs 214 and transverse ribs 215 arranged at intervals along a length direction of the flame spreader plate, and the longitudinal ribs 214 and the transverse ribs 215 intersect each other to define the combustion fire ports 211. External gas sources (e.g., the fuel gas and air) enter the flow channel 101 via the gas inlet 102 of body 10, then are fully mixed in flow channel 101 to form a gaseous mixture, which in turn flows from the gas outlet 103 to the metal mesh 30 and the flame spreader plate 21, and is ignited at the combustion fire ports 211 of the flame spreader plate 21 to form a combustion flame.

[0033] Nitrogen oxides (NOx) in gas water heaters are mainly generated due to high combustion temperatures. Traditional combustion grate typically employs a single strip-shaped fire hole structure. Since this single -shaped fire hole structure has a small fire hole area, the intensity of the combustion at the fire hole is high, and the emission performance of the exhaust gas emitted by instantaneous combustion is poor, resulting in high content of nitrogen oxides, which cannot meet the requirements of low nitrogen emission performance. In the present embodiment, by means of the cooperation of the flame spreader plate 21 having the combustion fire ports 211 the metal mesh 30 having a plurality of fine mesh holes, each of the combustion fire ports 211 having a large opening area can be divided into a plurality of fine fire holes through the fine mesh holes of the metal mesh 30. On the one hand, the present application can increase the combustion area of the combustion grate 100 compared to the strip-shaped fire hole of the traditional combustion grate 100; on the other hand, the present application can divided the fire hole, avoid the problem of local high temperature of the strip-shaped fire holes, make the temperature of the combustion surface of the combustion grate 100 more uniform, reduce the thermal intensity of the fire holes, and effectively suppress the generation of nitrogen oxides (NOx) , thereby realizing low-nitrogen combustion. In addition, the metal mesh 30 can also prevent safety accidents such as explosion caused by backfire.

[0034] The metal mesh 30 may be positioned above or below the flame spreader plate 21. In actual use, since the flame is above the flame spreader plate 21, the metal mesh 30 above the flame spreader plate 21 has higher requirements in terms of heat resistance, strength than the metal mesh 30 below the flame spreader plate 21. Considering factors such as cost, the metal mesh 30 may be arranged below the flame spreader plate 21. The assembly manner of the metal mesh 30 and the flame spreader plate 21 may comprise but not limited to welding, riveting or the like. The number of layers of the metal mesh 30 may be a single layer or multiple layers. The mesh number of the metal mesh 30 can be selected according to actual needs. For example, the mesh number of the metal mesh 30 may range from 20 mesh to 40 mesh, and may be 20 mesh, 30 mesh, 40 mesh, etc. In an example, the mesh number of the metal mesh 30 may be 30 mesh.

[0035] It should be noted that at least one flange 212 is provided on the side edge of the flame spreader plate 21 at a position corresponding to a respective one of the combustion fire ports 211. That is, at a position of the side edge of the flame spreader plate 21 facing at least one of the combustion fire ports 211, the flange 212 is arranged. For example, at each of the positions of the side edge of the flame spreader plate 21 opposite to all of the combustion fire ports 211, one flange 212 is arranged. Alternatively, the flanges 212 may be provided at positions of the side edge of the flame spreader plate 21 facing some of the combustion fire ports 211, and there is no flange at the positions of the side edge of the flame spreader plate 21 opposite to the other combustion fire ports 211. Further, the flame spreader plate 21 may be provided with the flange 212 on one side in the width direction, or the flame spreader plate 21 may be provided with flanges 212 on both sides in the width direction. A notch 213 is formed between at least part of the flanges 212 and the side edge of the corresponding combustion fire port 211. That is, a notch 213 is formed between at least one of the flanges 212 on the side edge of the flame spreader plate 21 and the side edge of the corresponding combustion fire port 211. For example, in a case where the flanges 212 are provided at positions on the side edge of the flame spreader plate 21 corresponding to multiple combustion fire ports 211, between each flange 212 and the side edge of the corresponding combustion fire port 211, a notch 213 may be formed, or, between part of the flanges 212 and the side edge of the corresponding combustion fire port 211, the notch 213 may be formed, and the other flanges 212 may be integrally connected with the side edge of the corresponding combustion fire port 211 without forming the notch 213. Further, a notch 213 may be formed between one side edge of the flange 212 and the corresponding combustion fire port 211, or notches 213 may be formed between each of the opposite side edges of the flange 212 and the corresponding combustion fire port 211.

[0036] In an example, as shown in FIG. 7, a flange 212 is provided on the side edge of the flame spreader plate 21 at the position corresponding to one of the combustion fire ports 211, this flange 212 is located in an area surrounded by the combustion fire port 211. The dimension of the flange 212 in the length direction of the flame spreader plate 21 is smaller than the dimension between two opposite side edges of the combustion fire port 211 in the length direction of the flame spreader plate 212, so that notches 213 are formed between two ends of the flange 212 and two side edges of the combustion fire port 211, respectively. Of course, in an example, one end of the flange 212 may extend to be connected to one side edge of the combustion fire port 211, and the notch 213 may be formed between the other end of the flange 212 and the other side edge of the combustion fire port 211. In actual, the combustion fire port 211 with the flange 212 can be directly formed on the flame spreader plate 21 made of sheet metal by a punching process, and a certain notch 213 is left between the flange 212 and the side edge of the combustion fire port 211, which manufacture manner is simple and convenient.

[0037] The combustion grate 100 of the technical solution of the present application comprises a body 10, a combustion head 20, and a metal mesh 30. A flow channel 101 is formed in the body 10. The combustion head 20 comprises a flame spreader plate 21 provided at a gas outlet 103 of the flow channel 101, and the flame spreader plate 21 is provided with a plurality of combustion fire ports 211 in communication with the flow channel 101. The metal mesh 30 is arranged at the combustion head 20 and covers the plurality of combustion fire ports 211. Each combustion fire port 211 having a large opening area can be divided into a plurality of fine fire holes by the fine mesh holes of the metal mesh 30. On the one hand, the present application can increase the combustion area of the combustion grate 100 compared to the strip-shaped fire hole of the traditional combustion grate 100; on the other hand, the present application can divided the fire hole, avoid the problem of local high temperature of the strip-shaped fire holes, make the temperature of the combustion surface of the combustion grate 100 more uniform, reduce the thermal intensity of the fire holes, and effectively suppress the generation of nitrogen oxides (NOx) , thereby realizing low-nitrogen combustion. In addition, the metal mesh 30 can also prevent safety accidents such as explosion caused by backfire. Flanges 212 are provided on the side edge of the flame spreader plate 21 at positions corresponding to at least part of the combustion fire ports 211. Between at least part of the flanges 212 and the side edge of the corresponding combustion fire port 211, the notch 213 is formed. A portion of the side edge of the metal mesh 30 is located on the bottom side of the flanges 212. By leaving the notch 213 between the side edge of the flange 212 and the combustion fire port 211, the perimeter of the contact contour between the flame and the flame spreader plate 21 is increased, so that the flame is more stably and the combustion noise is reduced. In addition, the side edge of the metal mesh 30 usually comprises uneven parts, and when the metal mesh 30 has multiple layers, the uneven phenomenon of the side edge is more obvious. If there is no flanges 212, after the combustion head 20 and the metal mesh 30 are assembled together, the side edge will have some large gaps or some small gaps, and the consistency is poor. Through the above design of the flanges 212, a part of the side edge of the metal mesh 30 is located on the bottom side of the flange 212, that is, the location of the side edge of the flame spreader plate 21 where the flange 212 is arranged can cover the uneven parts of the side edge of the metal mesh 30, so that the consistency of the combustion area of each combustion grate 100 is more stable. In addition, the flange 212 design having the notches 213 can also reduce the impact of flanges 212 on the combustion area, which ensures sufficient combustion area, and avoid the increase of CO and NOx in the flue gas caused by the flange 212 extending across the combustion fire port which reduces the combustion area too much. In this way, through the comprehensive action of the above aspects, the combustion stability can be improved, the combustion noise can be reduced, the nitrogen oxide emissions can be reduced, and low-nitrogen combustion can be achieved.

[0038] As shown in FIG. 7, in one embodiment, a plurality of combustion fire ports 211 are arranged at intervals along the length direction of the flame spreader plate 21. The flanges 212 are provided on two side edges of the flame spreader plate 21 opposite to each other in the width direction at positions corresponding to all of the combustion fire ports 211. Between each of the flanges 212 and the side edge of the corresponding combustion fire port 211, the notch 213 is formed.

[0039] In the present embodiment, since the plurality of combustion fire port 211 are arranged at intervals along the length direction of the flame spreader plate 21, it is possible to divide the gas, so that air and the fuel gas are burned after being sufficiently mixed. Here, the plurality of combustion fire ports 211 may be arranged in one row, two rows, multiple rows, and each row comprises a plurality of combustion fire ports 211 arranged at intervals in the length direction of the flame spreader plate 21. Flanges 212 are provided on two side edges of the flame spreader plate 21 opposite to each other in the width direction at positions corresponding to all of the combustion fire ports 211. The notch 213 is formed between each flange 212 and the side edge of the corresponding combustion fire port 211. In this way, the inner edge contour of each first combustion fire port 211a can be lengthened, and the perimeter of the contact contour between the flame and the flame spreader plate 21 can be maximized, so that the combustion stability can be further improved, and the combustion noise can be reduced. Since there is the notch 213 between each flange 212 and the side edge of the corresponding combustion fire port 211, the influence of the flange 212 on the combustion area can be minimized and the sufficient combustion area is ensured. In addition, in the length direction of the flame spreader plate 21, the uneven portions on two side edges of the metal mesh 30 are covered by the plurality of flanges 212 as much as possible, thereby further improving the uniformity of the combustion area of the combustion grate 100.

[0040] As shown in FIG. 9, in another embodiment, the plurality of said combustion fire ports 211 comprises first combustion fire ports 211a and second combustion fire ports 211b. The flanges 212 are provided on two side edges of the flame spreader plate 21 opposite to each other in the width direction at positions corresponding to all of the first combustion fire ports 211a. The notch 213 is formed between each of the flanges 212 and the side edge of the corresponding first combustion fire port 211a. The first combustion fire ports 211a and the second combustion fire ports 211b are arranged alternately and arranged at intervals in the length direction of the flame spreader plate 21; or, at least two first combustion fire ports 211a are arranged between any two adjacent second combustion fire ports 211b.

[0041] In the present embodiment, the flame spreader plate 21 is provided with first combustion fire ports 211a and second combustion fire ports 211b. Flanges 212 are provided on the side edge of the flame spreader plate 21 at positions corresponding to the first combustion fire ports 211a. The flange 212 may also be or may not be provided at the positions corresponding to the second combustion fire ports 211b. The first combustion fire port 211a and the second combustion fire port 211b may be the same or different in shape. In an example, the first combustion fire port 211a may be in the form of a rectangular opening, and the second combustion fire port 211b may be in the form of a strip-shaped opening extending in the width direction of the flame spreader plate 21. Further, the first combustion fire port 211a and the second combustion fire port 211b may be the same or different in area. For example, in the case that the area of the first combustion fire ports 211a is larger than the area of the second combustion fire ports 211b, the flanges 212 are provided on the side edge of the flame spreader plate 21 at positions corresponding to the first combustion fire ports 211a. In order to avoid the flange 212 shading the second combustion fire port 211b too much, there may be no flange 212 provided at positions corresponding to the second combustion fire ports 211b. In this way, the inner edge contour of the first combustion fire port 211a can be lengthened, and the perimeter of the contact contour between the flame and the flame spreader plate 21 can be increased, so that the combustion stability can be further improved, and the combustion noise can be reduced. Since there is no flange 212 provided at the second combustion fire ports 211b, the excessive shielding to the second combustion fire port 211b can be avoided, which is beneficial to ensuring the overall combustion area of the combustion grate 100. For another example, in the case that the area of the first combustion fire port 211a is equal to the area of the second combustion fire port 211b, the flanges 212 are provided at the positions corresponding to the first combustion fire ports 211a, and there is no flange 212 provided at the positions corresponding to the second combustion fire ports 211b. In this way, the combustion area of the first combustion fire port 211a can be partially shaded, and the actual combustion area of the first combustion fire port 211a is smaller than the actual combustion area of the second combustion fire port 211b, so that the combustion fire ports 211 having two different combustion areas can be formed on the flame spreader plate 21, which is beneficial to realize the mutual cooperation of large and small flames to form a flame stabilization effect.

[0042] In actual, the first combustion fire port 211a and the second combustion fire port 211b may be arranged in a variety of ways. For example, the first combustion fire port 211a and the second combustion fire port 211b are alternately arranged at intervals in the length direction of the flame spreader plate 21. Here, the flanges 212 are provided on the side edge of the flame spreader plate 21 at positions corresponding to the first combustion fire ports 211a, and there is no flange 212 provided at the positions corresponding to the second combustion fire ports 211b. In this way, when the combustion area of the first combustion fire ports 211a is different from the combustion area of the second combustion fire ports 211b (for example, the combustion area of the first combustion fire port 211a is larger than the combustion area of the second combustion fire port 211b), combustion units having smaller area and combustion units having larger area which are alternately arranged in the length direction of the flame spreader plate 21 can be formed, and the flame of the flame spreader plate 21 can be divided into small flames and large flames. Due to the different sizes of the flames, the boundary conditions of the wind speed of the flame-out and lift-off phenomenon are also different. When a certain flame has a tendency to occur the flame-out phenomenon, it can be drawn by the surrounding flames to form a stable flame, which makes the combustion grate 100 more adaptable to the wider range of the wind speed of the wind turbine.

[0043] For another example, at least two first combustion fire ports 211a may be arranged between any two adjacent second combustion fire ports 211b. Here, the flanges 212 are provided on the side edge of the flame spreader plate 21 at positions corresponding to the first combustion fire ports 211a, and there is no flange 212 provided at the positions corresponding to the second combustion fire ports 211b. In this way, the flame spreader plate 21 can also be divided into combustion units having different areas, and thus the combustion stability can be improved. In an example, as shown in FIG. 9, four first combustion fire ports 211a are arranged between any two adjacent second combustion fire ports 211b. The four first combustion fire ports 211a are arranged in an array of two rows and two columns. At the position on the side edge of the flame spreader plate 21 near each first combustion fire port 211a, the flange 212 is arranged, and the notch 213 is formed between each flange 212 and the side edge of the corresponding first combustion fire port 211a.

[0044] The gas flow at both ends of the combustion grate 100 collides with the boundary wall surface and then rapidly flows upward, that is, the speed of the gas flow in two end regions 21b of the flame spreader plate 21 is faster than that the speed of the gas flow in the middle region 21a, and thus the problem of flame-out and lift-off is likely to occur in the two end regions 21b, which will impact the combustion stability.

[0045] In order to solve the above problems, as shown in FIG. 6, in one embodiment, in the length direction of the flame spreader plate 21, the flame spreader plate 21 has a middle region 21a and two end regions 21b located at two ends of the middle region 21a, and the opening area of each combustion fire port 211 located in either end region 21b is smaller than the opening area of each combustion fire port 211 located in the middle region 21a. In this way, the opening area of each combustion fire port 211 located in the end regions 21b is relatively small, which is beneficial to increasing the resistance to the gas flow at the end regions 21b, thereby balancing the speed and the flow rate of the gas flow at the entire flame spreader plate 21, avoiding excessively fast flow rate in the two end regions 21b and thus the problem of flame-out and lift-off, so as to achieve the effect of stable combustion.

[0046] As shown in FIG. 6, in one embodiment, the flame spreader plate 21 comprises a plurality of longitudinal ribs 214 arranged at intervals along the length direction of the flame spreader plate. Each longitudinal rib 214 extends in the width direction of the flame spreader plate 21, each combustion fire port 211 is formed between any two adjacent longitudinal ribs 214. The arrangement density of the longitudinal ribs 214 located in the end regions 21b is greater than the arrangement density of the longitudinal ribs 214 located in the middle region 21a.

[0047] In the present embodiment, a plurality of longitudinal ribs 214 arranged at intervals cooperate with each other to form the plurality of combustion fire ports 211, which makes the structure of the combustion fire port 211 simpler and facilitates the production and the manufacture. The arrangement density of the longitudinal ribs 214 located in the end regions 21b is greater than the arrangement density of the longitudinal ribs 214 located in the middle region 21a, i.e. Compared with the longitudinal ribs 214 located in the middle region, the number of the longitudinal ribs 214 located in either end region 21b is greater per unit area. Therefore, the opening area of each combustion fire port 211 located in the end regions 21b is smaller than the opening area of each combustion fire port 211 located in the middle region 21a. As such, by arranging more longitudinal ribs 214 in the end regions 21b, the resistance to the gas flow can be increased, the speed and the flow rate of the gas at the entire flame spreader plate 21 can be balanced, and thus the problem of flame-out and lift-off caused by the excessively fast flow rate at the end regions 21b can be avoided, and the effect of stable combustion can be further achieved.

[0048] As shown in FIGS. 6 and 7, in one embodiment, a plurality of combustion fire ports 211 located in the middle region 21a of the flame spreader plate 21 are arranged in at least one row, and each row of the combustion fire ports comprises third combustion fire ports 211c and fourth combustion fire ports 211d alternately arranged in the length direction of the flame spreader plate 21, and the opening area of each third combustion fire port 211c is larger than the opening area of each fourth combustion fire port 211d.

[0049] In the present embodiment, the plurality of combustion fire ports 211 located in the middle region 21a of the flame spreader plate 21 may be arranged in one row, two rows, or multiple rows. In the example of one row of the combustion fire ports, the row of the combustion fire ports comprises third combustion fire ports 211c and fourth combustion fire ports 211d alternately arranged in the length direction of the flame spreader plate 21. The combustion area of each third combustion fire ports 211c is greater than the combustion area of each fourth combustion fire ports 211d, so that combustion units having smaller area and combustion units having larger area which are alternately arranged in the length direction of the flame spreader plate 21 can be formed, and the flame of the flame spreader plate 21 can be divided into small flames and large flames. Due to the different sizes of the flames, the boundary conditions of the wind speed of the flame-out and lift-off phenomenon are also different. When a certain flame has a tendency to occur the flame-out phenomenon, it can be drawn by the surrounding flames to form a stable flame, which makes the combustion grate 100 more adaptable to the wider range of the wind speed of the wind turbine.

[0050] As shown in FIG. 7, in one embodiment, at least two rows of the combustion fire ports are provided in the middle region 21a of the flame spreader plate 21. The at least two rows of combustion fire ports comprise a first row of combustion fire ports and a second row of combustion fire ports, which are disposed adjacent to each other in the width direction of the flame spreader plate 21. Both the first row of combustion fire ports and the second row of combustion fire ports comprise third combustion fire ports 211c and fourth combustion fire ports 211d alternately arranged in the length direction of the flame spreader plate 21. The third combustion fire ports 211c in the first row of combustion fire ports is disposed opposite to the fourth combustion fire ports 211d in the second row of combustion fire ports.

[0051] In the embodiments comprising two rows of combustion fire ports, the two rows of combustion fire port are a first row of combustion fire ports and a second row of combustion fire ports. The combustion fire ports in the first row may be distributed in the length direction of the flame spreader plate 21 according to the following sequence: the third combustion fire port 211c, the fourth combustion fire port 211d, the third combustion fire port 211c, the fourth combustion fire port 211d...; the combustion fire ports in the second row may be distributed in the length direction of the flame spreader plate 21 according to the following sequence: the fourth combustion fire port 211d, the third combustion fire port 211c, the fourth combustion fire port 211d, the third combustion fire port 211c... As such, the third combustion fire ports 211c in the first row and the fourth combustion fire ports 211d in the second row are arranged opposite to each other in the width direction of the flame spreader plate 21. In this way, it is possible to form a plurality of combustion units having different sizes and arranged alternately in the length direction of the flame spreader plate 21, and also a plurality of combustion units having different sizes and arranged alternately in the width direction of the flame spreader plate 21. In this way, the flame on the flame spreader plate 21 can be divided into large flames and small flames in the length direction and the width direction, thereby allowing a better flame stabilization effect, further improving the combustion stability, and reducing the combustion noise.

[0052] As shown in FIG. 7, in one embodiment, the flame spreader plate 21 comprises a plurality of transverse ribs 215 arranged in the length direction of the flame spreader plate. Each of the transverse ribs 215 extends in the length direction of the flame spreader plate 21, any two adjacent transverse ribs 215 are staggered in the width direction of the flame spreader plate 21, and the third combustion fire ports 211c and the fourth combustion fire ports 211d adjacent in the width direction of the flame spreader plate 21 are separated by the transverse rib 215.

[0053] In the present embodiment, any two adjacent transverse ribs 215 in the plurality of transverse ribs 215 of the flame spreader plate 21 are staggered with respect to one another, that is, the center lines of the any two adjacent transverse ribs 215 are not coincident. In this way, the third combustion fire ports 211c and the fourth combustion fire ports 211d adjacent in the width direction of the flame spreader plate 21 can be separated by the transverse ribs 215, and the third combustion fire ports 211c and the fourth combustion fire ports 211d in the same row can also be staggered by means of the staggered transverse ribs 215. Therefore, large combustion units and small combustion units, staggered with respect to one another and arranged at intervals, are formed on the flame spreader plate 21. In this way, the flame on the flame spreader plate 21 can be divided into large flames and small flames, and the large and small flames are staggered with respect to one another. When a certain flame has a tendency to occur the flame-out phenomenon, it can be drawn by the surrounding flames to form a stable flame, which makes the combustion grate 100 more adaptable to the wider range of the wind speed of the wind turbine.

[0054] Of course, in other embodiments, the centerlines of the plurality of transverse ribs 215 on the flame spreader plate 21 may also be coincident. In this case, it is only necessary to design the shape of the combustion fire ports 211 on the flame spreader plate 21 to achieve the effect of dividing the flame on the flame spreader plate 21 into large and small flames to allow the stable combustion. For example, as shown in FIG. 9, in one embodiment, the plurality of combustion fire ports 211 on the flame spreader plate 21 comprise first combustion units and second combustion units alternately arranged in the length direction of the flame spreader plate 21. The first combustion unit comprises four first combustion fire ports 211a arranged in an array, and the four first combustion fire ports 211a are separated from each other by the transverse rib 215 and longitudinal rib 214 which intersect one another. The second combustion unit comprises a single second combustion fire port 211b. In this case, the center lines of the plurality of transverse ribs 215 are coincident. The combustion area of each first combustion unit is larger than the combustion area of each second combustion unit.

[0055] As shown in FIGS. 7 and 9, in some embodiments, the side edge of at least part of the combustion fire ports 211 is provided with protrusions 216 and / or grooves. By providing the protrusions 216 and / or the grooves on the side edges of the combustion fire ports 211, on the one hand, the contact surface between the flame and the surrounding air can be increased, and on the other hand, the inner edge contour of the combustion fire ports 211 can be further extended, so that the perimeter of the contact contour between the flame and the flame spreader plate 21 can be increased, and the flame is more stable.

[0056] Two adjacent combustion fire ports 211 are generally separated by the transverse rib 215 or the longitudinal rib 214, i.e. the transverse rib 215 or the longitudinal rib 214 forms a part of the side edge of the combustion fire port 211. Since the width of the transverse rib 215 and the width of the longitudinal rib 214 are generally narrow, in order to avoid that the structural strength of the rib greatly affect by the arrangement of the grooves, the protrusions 216 may be provided on the edge of the transverse rib 215 and / or the longitudinal rib 214. In this way, the inner edge contour of the combustion fire port 211 can be extended while ensuring the structural strength. Furthermore, in the case that the flanges 212 are provided at part of the combustion fire ports 211, the flanges 212 may also be regarded as a part of the side edges of the combustion fire ports 211, and the protrusions 216 may also be provided on the flanges 212. The shape of the protrusions 216 may be hemispherical, toothed, or other shapes as desired.

[0057] In an example, as shown in FIG. 7, in one embodiment, the flame spreader plate 21 is provided with third combustion fire ports 211c and fourth combustion fire ports 211d arranged alternately in the length direction. The opposite side edges of each third combustion fire port 211c are provided with the protrusions 216. In an example, as shown in FIG. 9, in another embodiment, the flame spreader plate 21 is provided with first combustion fire ports 211a and second combustion fire ports 211b. The second combustion fire ports 211b extend in the width direction of the flame spreader plate 21, and two protrusions 216 are provided on each of two long sides of each second combustion fire port 211b. It should be noted that, the arrangement manner of the protrusions 216 is not limited thereto, and the protrusions 216 may be provided at side edges of each combustion fire port 211. Further, the number of protrusion 216 within a single combustion fire port 211 may be one, two, or more. In the case that the number of the protrusions 216 within a single combustion fire port 211 is even, the protrusions 216 may be arranged symmetrically or asymmetrically.

[0058] In addition to any of the above embodiments, referring to FIGS. 3 to 5, the combustion head 20 further comprises two side plates 22 provided on two sides of the flame spreader plate 21 in the width direction. Both of the side plates 22 are bent towards the interior of the flow channel 101 with respect to the flame spreader plate 21. A main gas outlet channel 201 is formed between the two adjacent side plates 22, and the main gas outlet channel 201 communicates the flow channel 101 with the plurality of combustion fire ports 211. A lateral gas outlet channel 202 in communication with the flow channel 101 is formed between a side of each side plate 22 facing away from another side plate 22 and the body 10. A side of the lateral gas outlet channel 202 facing away from the flow channel 101 is opened to form a flame stabilizing opening.

[0059] In the present embodiment, the two side plates 22 and the flame spreader plate 21 may be integrally formed by bending of a sheet metal plate, or may be connected and fixed by welding, riveting, or the like. In order to simplify the manufacturing process, in one embodiment, the combustion head 20 is a sheet metal part. The sheet metal part is bent to integrally form the flame spreader plate 21 and two side plates 22, and then the corresponding combustion fire ports 211 are formed on the flame spreader plate 21 by punching. During the assembly, the combustion head 20 is placed in the gas outlet 103 of the body 10, and then the two side plates 22 are welded and fixed to the two half-shells of the body 10, respectively. By the cooperation of the combustion head 20 and the body 10, the portion of the body 10 at the gas outlet 103 can be divided into the main gas outlet channel 201 and the lateral gas outlet channel 202 located on two sides of the main gas outlet channel 201. The fuel gas and air are thoroughly mixed within the flow channel 101 of the body 10 to form a gaseous mixture. The gaseous mixture is transported to a position at the combustion head 20 to be divided, a part of the gaseous mixture is transported to the combustion fire ports 211 of the flame spreader plate 21 via the main gas outlet channel 201 and burned at the combustion fire ports to form a main flame, and the other part of the gaseous mixture is output through the lateral gas outlet channel 202 on two sides and burned at the flame stabilizing opening to form a lateral flame. The lateral flame on the two sides can stabilize the main flame on the flame spreader plate 21, thereby further improving the combustion stability.

[0060] As shown in FIGS. 2 and 5, in one embodiment, a plurality of lateral protuberances 11 may be arranged at intervals in the length direction of the body 10, the lateral protuberances are arranged on the body 10 at positions opposite to each side plate 22, and the lateral protuberances 11 may be formed by stamping the body 10 outward from the inner side. The lateral gas outlet channel 202 is formed between each lateral protuberance 11 and the side plates 22. Further, a recess recessed toward the side plate 22 is formed between any two adjacent lateral protuberances 11. The recess can abut against the side plate 22 and form a welding position so as to weld the side plate 22 to the body 10.

[0061] As shown in FIG. 5, in one embodiment, a first flow splitter opening 203 is formed between a side of each side plate 22 facing away from the flame spreader plate 21 and the body 10, the first flow splitter opening 203 communicates the flow channel 101 with the lateral gas outlet channel 202. In the present embodiment, a gap is formed between the side of each side plate 22 facing away from the flame spreader plate 21 (that is, the bottom side of each side plate 22) and the body 10, and the gap is the first flow splitter opening 203. In the process of the upward transportation of the gaseous mixture in the flow channel 101, a part of the gaseous mixture can enter the lateral gas outlet channel 202 via the first flow splitter opening 203, and then be transported to the flame stabilizing opening through the lateral gas outlet channel 202 to burn to form a lateral flame, so as to play a flame stabilizing effect on the main flame on the flame spreader plate 21. In one embodiment, the body 10 is provided with a inclined guide surface at a position corresponding to the first flow splitter opening 203, the inclined guide surface extends from the first flow splitter opening 203 toward the inside of the lateral gas outlet channel 202 and inclines upward. In this way, the gas entering from the first flow splitter opening 203 can be better guided upward to the flame stabilizing opening. In addition, the inclined guide surface can also guide the gas from the first flow splitter opening 203 to the side wall of the body 10, and then the gas can flow upward to the flame stabilizing mouth along the side wall, thereby avoiding the excessive speed of the gas passing through the lateral gas outlet channel 202, which is beneficial to further improving the flame stabilizing effect.

[0062] As shown in FIG. 5, in one embodiment, each side plate 22 is provided with a second flow splitter opening 221, the second flow splitter opening 221 communicates the main gas outlet channel 201 with the lateral gas outlet channel 202. In the present embodiment, each side plate 22 is provided with the second flow splitter opening 221. After the gaseous mixture in the flow channel 101 is transported upward to the main gas outlet channel 201 between the two side plates 22, a part of the gaseous mixture can be continuously transported upward to the combustion fire ports 211 to burn, and another part of the gaseous mixture can enter the lateral gas outlet channel 202 through the second flow splitter opening 221, and then transported to the flame stabilizing opening through the lateral gas outlet channel 202 for combustion to burn to form a lateral flame which may exert a flame stabilizing effect on the main flame on the flame spreader plate 21.

[0063] The number of the second flow splitter openings 221 on each side plate 22 may be determined according to actual requirements, and may be one or more. In one embodiment, each side plate 22 is provided with a plurality of second flow splitter opening 221 at intervals along the length direction of the side plate. For example, if the plurality of lateral protuberances 11 arranged at intervals along the length direction of the body 10 are provided on the body at positions opposite to each side plate 22, and the lateral gas outlet channel 202 is formed between each lateral protuberance 11 and the side plate 22, one or more second flow splitter openings 221 may be provided on each side plate 22 at positions corresponding to the lateral protuberances 11. The shape of the second flow splitter openings 221 comprises, but is not limited to, a circle, a rectangle, an elongated strip, a triangle, a trapezoid, or other special shapes. In the case that a plurality of second flow splitter openings 221 are provided on the side plate 22, the plurality of second flow splitter openings 221 may be the same or different in shape. In an example, as shown in FIG. 10, each side plate 22 is provided with a plurality of second flow splitter openings 221 along the length direction, each of the second flow splitter openings 221 located on two sides is in the form of a strip-shaped opening extending in the length direction of the side plate 22, and each of the second flow splitter openings 221 located at the middle is in the form of a circular opening. In one embodiment, each side plate 22 is provided with a strip-shaped second flow splitter opening 221 at a position corresponding to the lateral gas outlet channel 202 at each end in the length direction of the body 10, and each side plate 22 is provided with three circular second flow splitter openings 221 arranged side by side at a position corresponding to the lateral gas outlet channel 202 at middle.

[0064] As shown in FIG. 5, in one embodiment, a first flow splitter opening 203 is formed between a side of each side plate 22 facing away from the flame spreader plate 21 and the body 10, each side plate is provided with a second flow splitter opening 221 that communicates the main gas outlet channel 201 with the lateral gas outlet channel 202.

[0065] In this embodiment, in the process of the upward transportation of the gaseous mixture in the flow channel 101, a part of the gaseous mixture can enter the lateral gas outlet channel 202 via the first flow splitter opening 203, and the other part of the gaseous mixture can enter the lateral gas outlet channel 202 via the second flow splitter opening 221. In this way, the side of the combustion grate 100 has the effect of graded gas outlet, and it is possible to ensure that there always is gaseous mixture flowing out for combustion (side flame) on the side of the combustion grate 100 under different load conditions. On the one hand, it has the effect of stabilizing the main flame. On the other hand, it increases the amount of gaseous mixture on the side, makes full use of the space on the side of the combustion grate 100, increases the total combustion area, and reduce the nitrogen oxides NOx in the combustion exhaust gas. Generally, NOx in gas water heaters is mainly generated by high combustion temperature. In the present application, the side flame consumes part of the gaseous mixture originally used for the main flame, which reduces the thermal intensity of the fire ports in the main flame region, reduces the temperature of the main flame region, and effectively suppresses the generation of NOx.

[0066] As shown in FIGS. 2 and 5, in one embodiment, a plurality of lateral protuberances 11 are arranged at intervals in a length direction of the body 10, the lateral protuberances is arranged on the body 10 at positions opposite to each side plate 22. The flow channel is formed between each lateral protuberance 11 and the side plate 22 adjacent to the lateral protuberance 11. The lateral protuberances 11 facing towards the same side plate 22 comprises two end lateral protuberances 11a located at two ends, and middle lateral protuberances 11b located between the two end lateral protuberances 11a. The first flow splitter opening 203 is formed between a side of each side plate 22 facing away from the flame spreader plate 21 and each middle lateral protuberance 11b, the second flow splitter opening 221 is provided on each side plate 22 at positions opposite to the end lateral protuberances 11a and the middle lateral protuberances 11b.

[0067] In the present embodiment, the height of the end lateral protuberance 11a is lower than the height of the middle lateral protuberance 11b due to the structural restriction of the body 10. In order to better match the gas flow rate at the lateral protuberances 11a at different positions, a first flow splitter opening 203 is formed between the side of each side plate 22 facing away from the flame spreader plate 21 and each middle lateral protuberance 11b, and a second flow splitter opening 221 is provided on each side plate at positions opposite to each middle lateral protuberance 11b. In this way, a two-stage shunt effect can be formed at the positions where the middle lateral protuberances 11b are located. However, there is no first flow splitter opening 203 between the side of each side plate 22 facing away from the flame spreader plate 21 and each end lateral protuberance 11a, and only the second flow splitter opening 221 is provided on the side plate 22 at the position opposite to each end lateral protuberances 11a, that is, the positions where the end lateral protuberances 11a are located has only one-stage shunt effect. In one embodiment, the second flow splitter opening 221 corresponding to each end lateral protuberance 11a is in the form of a strip-shaped opening, which is simple in structure and easy to manufacture. In one embodiment, the second flow splitter opening 221 corresponding to each middle lateral protuberance 11b is in the form of a circular opening, which is simple in structure, easy to manufacture. In addition, it is convenient to adjust the opening area and the number of openings according to actual requirements, so as to realize the adjustment of the flow rate of the gas. For example, three circular second flow splitter openings 221 are arranged side by side on each side plate 22 at positions corresponding to all of middle lateral protuberances 11b.

[0068] The present application also proposes a gas appliance comprising the combustion grate 100 of the embodiment described above. Since the gas appliance adopts all the technical solutions of all the above embodiments, it has at least all the effects brought by the technical solutions of the above embodiments, which will not be repeatedly described here.

[0069] As an example, the combustion appliance may be a burner, such as an atmospheric burner, a rich lean burner, or other form of burner such as a water-cooled burner.

[0070] As an example, the combustion appliance may also be a gas water heater, a boiler, or the like.

[0071] What described are merely preferable embodiments of the present application, and are not intended to limit the scope of protection of the present application. All equivalent structures made using the specification and accompanying drawings of the present application, or direct or indirect applications of the application to other related technical fields should be comprised within the scope of protection of the present application.

Claims

1. A combustion grate, characterized in that the combustion grate comprises: a body in which a flow channel is formed; a combustion head comprising a flame spreader plate arranged at a gas outlet of the flow channel, the flame spreader plate being provided with a plurality of combustion fire ports in communication with the flow channel, flanges being provided on a side edge of the flame spreader plate at positions corresponding to at least part of the combustion fire ports, notches being formed between at least part of the flanges and a side edge of a corresponding combustion fire port; and a metal mesh arranged on the combustion head and disposed opposite to the plurality of combustion fire ports, a part of a side edge of the metal mesh being located on a bottom side of the flanges.

2. The combustion grate according to claim 1, wherein the plurality of combustion fire ports are arranged at an interval in a length direction of the flame spreader plate, the flanges being provided on two side edges of the flame spreader plate at positions corresponding to all of the combustion fire ports, wherein the two side edges of the flame spreader plate being opposite to each other in a width direction of the flame spreader plate, and the notch being formed between each of the flanges and the side edge of the corresponding combustion fire port.

3. The combustion grate according to claim 1 or 2, wherein the plurality of combustion fire ports comprise first combustion fire ports and second combustion fire ports, the flanges being provided on two side edges of the flame spreader plate at positions corresponding to all of the first combustion fire ports, wherein the two side edges of the flame spreader plate being opposite to each other in a width direction of the flame spreader plate), and the notch being formed between each of the flanges and the side edge of the corresponding first combustion fire port; and the first combustion fire ports and the second combustion fire ports are arranged alternately and arranged at an interval in a length direction of the flame spreader plate; or, at least two first combustion fire ports are arranged between any two adjacent second combustion fire ports.

4. The combustion grate according to any one of claims 1 to 3, wherein in a length direction of the flame spreader plate, the flame spreader plate has a middle region and two end regions located at two ends of the middle region, an opening area of each combustion fire port located in either end region being smaller than an opening area of each combustion fire port located in the middle region.

5. The combustion grate according to claim 4, wherein the flame spreader plate comprises a plurality of longitudinal ribs arranged at an interval in the length direction of the flame spreader plate, each longitudinal rib extending in a width direction of the flame spreader plate, each combustion fire port being formed between any two adjacent longitudinal ribs, an arrangement density of the longitudinal ribs located in the end regions being greater than the arrangement density of the longitudinal ribs located in the middle region.

6. The combustion grate according to any one of claims 1 to 5, wherein a plurality of the combustion fire ports located in a middle region of the flame spreader plate are arranged in at least one row, each row of the combustion fire ports comprising third combustion fire ports and fourth combustion fire ports alternately arranged in a length direction of the flame spreader plate, an opening area of each third combustion fire port being larger than an opening area of each fourth combustion fire port.

7. The combustion grate according to claim 6, wherein at least two rows of the combustion fire ports are provided in the middle region of the flame spreader plate, the at least two rows of the combustion fire ports comprising a first row of the combustion fire ports and a second row of the combustion fire ports, which are disposed adjacent to each other in a width direction of the flame spreader plate, both the first row of the combustion fire ports and the second row of the combustion fire ports comprising third combustion fire ports and the fourth combustion fire ports alternately arranged in the length direction of the flame spreader plate, the third combustion fire ports in the first row being disposed opposite to the fourth combustion fire ports in the second row.

8. The combustion grate according to claim 7, wherein the flame spreader plate comprises a plurality of transverse ribs arranged in the length direction of the flame spreader plate, each of the transverse ribs extending in the length direction of the flame spreader plate, any two adjacent transverse ribs being staggered in the width direction of the flame spreader plate, the third combustion fire ports and the fourth combustion fire ports adjacent in the width direction of the flame spreader plate being separated by the transverse ribs.

9. The combustion grate according to any one of claims 1 to 8, wherein the side edge of at least part of the combustion fire ports is provided with protrusions and / or grooves.

10. The combustion grate according to any one of claims 1 to 9, wherein the combustion head further comprises two side plates arranged on two sides of the flame spreader plate in a width direction of the flame spreader plate, both of the side plates being bent towards an interior of the flow channel with respect to the flame spreader plate, a main gas outlet channel being formed between the two adjacent side plates, the main gas outlet channel communicating the flow channel with the plurality of combustion fire ports, a lateral gas outlet channel in communication with the flow channel being formed between a side of each side plate facing away from another side plate and the body, a side of the lateral gas outlet channel facing away from the flow channel being opened to form a flame stabilizing opening.

11. The combustion grate according to claim 10, wherein a first flow splitter opening is formed between a side of each side plate facing away from the flame spreader plate and the body, the first flow splitter opening communicating the flow channel with the lateral gas outlet channel, and / or each side plate is provided with a second flow splitter opening which communicates the main gas outlet channel with the lateral gas outlet channel.

12. The combustion grate according to claim 11, wherein a plurality of lateral protuberances are arranged at an interval in a length direction of the body, the lateral protuberances being arranged on the body at positions opposite to each of the side plates, the flow channel being formed between each lateral protuberance and the side plate adjacent to the lateral protuberance, the lateral protuberances facing towards the same side plate comprising two end lateral protuberances located at two ends, and middle lateral protuberances located between the two end lateral protuberances, the first flow splitter opening being formed between a side of each side plate facing away from the flame spreader plate and each middle lateral protuberance, the second flow splitter opening being provided on each side plate at positions opposite to the end lateral protuberances and the middle lateral protuberances.

13. A combustion appliance, comprising a combustion grate according to any one of claims 1 to 12.

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