BURNER HEAD, FIRE GRATE, AND GAS DEVICE

Abstract

A burner head includes a burner cover provided with a plurality of fire holes that are spaced apart from each other, and a metal mesh provided at the burner cover and covering the plurality of fire holes. A welding spot is provided in a welding region of the metal mesh that corresponds to the plurality of fire holes.

Claims

1. A burner head comprising: a burner cover provided with a plurality of fire holes that are spaced apart from each other; and a metal mesh provided at the burner cover and covering the plurality of fire holes, a welding spot being provided in a welding region of the metal mesh that corresponds to the plurality of fire holes.

2. The burner head according to claim 1, wherein the welding spot is provided at a center of the welding region.

3. The burner head according to claim 1, wherein the welding spot is one of at least two welding spots in the welding region that are randomly spaced and distributed.

4. The burner head according to claim 1, wherein the metal mesh includes a plurality layers welded by the welding spot.

5. The burner head according to claim 1, wherein the metal mesh is provided below the burner cover.

6. The burner head according to claim 1, wherein the burner cover includes: a panel provided with a hollow region; and two side plates respectively connected to two sides, in a width direction, of the panel; wherein: the panel includes a plurality of partition ribs in the hollow region and extending in the width direction of the panel, the plurality of partition ribs being spaced apart from each other in a length direction of the panel to separate the hollow region into the plurality of fire holes; and the metal mesh is provided at back of the panel.

7. The burner head according to claim 6, wherein the metal mesh is fixed to the partition ribs by welding.

8. A fire grate comprising: a housing having an airflow channel in the housing; and the burner head according to claim 1, the burner head being provided at a top of the housing and the plurality of fire holes communicating with the airflow channel.

9. The fire grate according to claim 8, wherein the burner cover includes: a panel at the top of the housing; and two side plates provided at two sides, in a width direction, of the panel, the two side plates being inserted in the airflow channel and fixedly connected to an inner wall of the housing.

10. The fire grate according to claim 9, wherein: a plurality of recesses are provided at two sides, in a width direction, of the housing, the plurality of recesses being spaced apart from each other along a length direction of the housing, and each of the plurality of recesses abutting and being fixed to a corresponding one of the two side plates; and the panel is provided with a plurality of partition ribs spaced apart from each other along a length direction of the panel, the plurality of partition ribs being in one-to-one correspondence with the plurality of recesses.

11. A fire grate comprising: a housing having an airflow channel in the housing; a burner cover at a top of the housing and provided with a plurality of fire holes communicating with the airflow channel; and a rectification plate in the airflow channel, the rectification plate being below and spaced apart from the burner cover, the rectification plate extending from one end to another, in a length direction, of the housing, the rectification plate being provided with a vent, and a distance between the rectification plate and the burner cover being greater than or equal to 1 mm.

12. The fire grate according to claim 11, wherein the rectification plate has a first region and second regions provided at two ends of the first region in a length direction of the rectification plate, the first region being provided with a plurality of vents, and a unit air passing area of the second region being smaller than a unit air passing area of the first region.

13. The fire grate according to claim 12, wherein an air passing area of the second region is zero.

14. The fire grate according to claim 12, wherein the second region is an opening region, wherein a unit opening area of the second region is smaller than a unit opening area of the first region.

15. The fire grate according to claim 14, wherein: the plurality of vents are a plurality of first vents; the second region is provided with a plurality of second vents spaced apart from each other and distributed along the length direction of the rectification plate; and a distance between two adjacent second vents gradually increases from a location adjacent to the first region to a location distant from the first region, or an opening area per second vent of the plurality of second vents gradually decreases from the location adjacent to the first region to the location distant from the first region.

16. The fire grate according to claim 12, wherein a length L2 of each of the second regions and a total length L of the rectification plate satisfy 1/7LL21/5L.

17. The fire grate according to claim 12, wherein the plurality of vents include a plurality of first sub-vents and a plurality of second sub-vents, an opening area of each of the first sub-vents being different from an opening area of each of the second sub-vents, the plurality of first sub-vents and the plurality of second sub-vents being spaced apart from one another and alternately provided along the length direction of the rectification plate.

18. The fire grate according to claim 17, wherein: each two first sub-vents of the plurality of first sub-vents are provided between two adjacent ones of the plurality of second sub-vents, and the two first sub-vents are spaced apart from each other in a width direction of the rectification plate; and the plurality of second sub-vents are provided at a middle of the rectification plate in the width direction, and an edge of each of the second sub-vents protrudes toward a space between the corresponding two first sub-vents.

19. The fire grate according to claim 11, further comprising: a metal mesh provided below the burner cover and covering the plurality of fire holes.

20. A gas device comprising: a fire grate including: a housing having an airflow channel in the housing; a burner cover at a top of the housing and provided with a plurality of fire holes communicating with the airflow channel; and a rectification plate in the airflow channel, the rectification plate being below and spaced apart from the burner cover, the rectification plate extending from one end to another, in a length direction, of the housing, the rectification plate being provided with a vent, and a distance between the rectification plate and the burner cover being greater than or equal to 1 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to explain the embodiments of the present application more clearly, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, other accompanying drawings can be obtained based on the provided accompanying drawings without exerting creative efforts for those skilled in the art.

[0012] FIG. 1 is a schematic structural diagram of a fire grate according to an embodiment of the present application.

[0013] FIG. 2 is a schematic exploded structural diagram of the fire grate according to an embodiment of the present application.

[0014] FIG. 3 is a schematic structural diagram of a burner head according to an embodiment of the present application.

[0015] FIG. 4 is a schematic exploded structural diagram of the burner head according to an embodiment of the present application.

[0016] FIG. 5 is a top view of the burner head according to an embodiment of the present application.

[0017] FIG. 6 is a side view of a metal mesh welding spot according to an embodiment of the present application.

[0018] FIG. 7 is a top view of the metal mesh welding spot according to an embodiment of the present application.

[0019] FIG. 8 is a schematic structural diagram of the fire grate according to an embodiment of the present application.

[0020] FIG. 9 is a schematic exploded structural diagram of the fire grate according to an embodiment of the present application.

[0021] FIG. 10 is a schematic diagram showing airflow diffusion in the fire grate according to an embodiment of the present application.

[0022] FIG. 11 is a schematic structural diagram according to an embodiment of the present application in which a second region of a rectification plate is a closed region.

[0023] FIG. 12 is a schematic structural diagram in an embodiment of the present application in which the second region of the rectification plate is an opening region.

[0024] The realization of the purpose, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solutions in the embodiments according to the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments according to the present application, and it is clear that the described embodiments are only a part of the embodiments according to the present application, and not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative labor fall within the scope of the present application.

[0026] It should be noted that if there are directional instructions (such as up, down, left, right, front, back or the like) involved in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship, movement and so on between various components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, the meaning of and/or appearing in the entire text includes three parallel solutions, taking A and/or B as an example, it includes solution A, or solution B, or a solution that satisfies both A and B at the same time.

[0028] In addition, if there are descriptions involving first, second or the like, the descriptions of first, second or the like are only for descriptive purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity of the technical features indicated. Therefore, features defined as first and second may explicitly or implicitly include at least one of these features. In addition, the technical solutions of various embodiments can be combined with each other, but it is based on that those skilled in the art can realize. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by the present application.

[0029] In the related art, some burners' fire grates are equipped with metal mesh on their burner heads, and the mesh holes of the metal mesh are used to form fine combustion holes. However, the resistance of the metal mesh fire holes is relatively small, when the wind speed of the fan fluctuates, it is easy to cause flame separation and fire failure, resulting in unstable combustion. Based on this, the present application provides a burner head 1, which aims to increase the resistance of the metal mesh 12 corresponding to the fire hole 101, reduce the airflow intensity, avoid flame separation, ensure complete combustion, and reduce nitrogen oxide emissions by providing welding spots at the metal mesh 30. It can be understood that, as shown in FIG. 1 and FIG. 2, the burner head 1 is applied to the fire grate, and the housing 2 of the fire grate has an airflow channel for passing gas and air. The burner head 1 is provided at the top of the housing 2, so that the mixed gas of gas and air is ejected from the airflow channel and burned. The structure of the burner head 1 is described in the following embodiments.

[0030] As shown in FIG. 2 to FIG. 7, the burner head 1 includes a burner cover 11 and a metal mesh 12. The burner cover 11 is provided with a plurality of fire holes 101 distributed at intervals. The metal mesh 12 is provided at the burner cover 11 and covers the plurality of fire holes 101. The part of the metal mesh 12 corresponding to the fire holes 101 is referred to as a welding region 12a, and a welding spot 13 is provided in the welding region 12a.

[0031] It can be understood that the burner cover 11 is provided at the top of the housing 2 of the fire grate, and the air inlet 202 of the airflow channel in the housing 2 is connected to the airflow source including air and gas. The gas and air enter the airflow channel from the air inlet 202, flow to the air outlet 201 after being premixed in the airflow channel, and are ejected and ignited through the multiple fire holes 101 on the burner cover 11 to form a combustion flame. In an embodiment, the specific structure of the burner cover 11 can be determined according to actual conditions, for example, it can be a plate structure, a U-shaped structure or other shape structures. The burner cover 11 can be made of high temperature resistant sheet metal. The multiple fire holes 101 are distributed at intervals, which can play a role in equalizing the flow, so that the airflow is more uniform when ejected. In an embodiment, the fire hole 101 can be a circular hole, a square hole, a triangular hole, a strip hole or other irregular shape holes.

[0032] The metal mesh 12 is provided at the burner cover 11 and covers a plurality of fire holes 101, which plays a role in breaking up the airflow so that the mixed gas can be fully burned after being ignited, forming a stable and uniform flame. In addition, the metal mesh 12 can also prevent safety accidents such as explosions caused by backfire. It can be understood that the metal mesh 12 can be located above or below the fire hole 101. In actual application, since the flame burns above the burner head 1, the heat resistance and strength requirements of the metal mesh 12 located above the fire hole 101 will be higher than those of the metal mesh 12 located below the fire hole 101. Considering factors such as cost and service life, the metal mesh 12 can be provided below the fire hole 101. In an embodiment, the metal mesh 12 is made of high temperature resistant material, such as iron chromium aluminum material.

[0033] In an embodiment, the part of the metal mesh 12 corresponding to the fire hole 101 is referred to as the welding region 12a, by providing the welding spot 13 on the welding region 12a, the resistance at the welding region 12a can be increased. Specifically, during the spot welding process of the metal mesh 12, the center of the welding spot 13 is squeezed most obviously and melted into one at high temperature. Therefore, the metal mesh 12 at the center of the welding spot 13 is the tightest and has the greatest resistance. The resistance spreads from the middle to the surroundings, and the resistance gradually changes from the maximum when it is tight to the normal resistance of the metal mesh 12 in the natural state. Being provided with the welding spot 13, the metal mesh 12 have the characteristic of gradual resistance change. When the airflow ejected from the airflow channel burns on the metal mesh 12, the flames are merged into one. At the position with large resistance, the gas flow rate is slow and it is not easy to flame out. Therefore, the flame stabilization effect adjacent to the welding spot 13 of the metal mesh 12 is the best. At the same time, it is merged with the surrounding flames to play a pulling role. Compared with the solution without the design of the welding spot 13 in the related art, the overall flame of the burner head 1 is more stable, not easy to flame out. The combustion is more complete, and the nitrogen oxide emission in the combustion flue gas is lower.

[0034] In an embodiment, the quantity of layers of the metal mesh 12 can be single layer, double layer or multiple layers. When it is a single layer, spot welding can be performed on the single layer of the metal mesh 12, which can pull the surrounding region, play a role in the gradual change of resistance, and achieve a flame stabilization effect. When it is two or more layers, the welding spot 13 can fuse the two or more layers of metal mesh 12 together, and the center of the welding spot 13 plays a pulling role on the two or more layers of metal mesh 12. The resistance gradually changes from the center position of the welding spot 13 to the surrounding region to the normal resistance of the two or more layers of metal mesh 12 in the natural state, and the gas flow rate also gradually increases from the center position adjacent to the welding spot 13 to the surrounding region, achieving a better flame stabilization effect.

[0035] In summary, in the burner head 1 according to the technical solution of the present application, the burner cover 11 is provided with a plurality of fire holes 101 distributed at intervals, and the metal mesh 12 is provided at the burner cover 11 and covers the plurality of fire holes 101, which can not only increase the combustion area, but also break up the airflow, so that the combustion is more uniform and stable. By providing the welding spot 13 at the position of the metal mesh 12 corresponding to the fire hole 101, the welding spot 13 can play a pulling role on the metal mesh 12, so that the resistance of the metal mesh 12 at the welding spot 13 increases, and the resistance gradually decreases from the center of the welding spot 13 to the surroundings, so that the airflow speed also gradually increases from the position adjacent to the center of the welding spot 13 to the surroundings. When the ejected airflow burns on the burner head 1, the flames will merge into one, and the flames at the low flow rate position will pull the flames at the high flow rate position, thereby making the overall flame of the burner head 1 more stable, not easy to flame out, achieve full combustion, and reduce the emission of nitrogen oxides.

[0036] In an embodiment of the present application, as shown in FIG. 5 to FIG. 7, a welding spot 13 is provided in the welding region 12a, and the welding spot 13 is provided at the center of the welding region 12a.

[0037] In an embodiment, as an example, each welding region 12a is provided with one welding spot 13. By providing the welding spot 13 at the center of the welding region 12a, the resistance at the center of the welding region 12a is the largest and gradually decreases toward the surroundings. In this way, the distribution of the airflow through the welding region 12a can be more uniform. At the same time, the flame at the center of the welding region 12a can pull the surrounding flames to achieve a better flame stabilization effect.

[0038] It should be noted that the welding region 12a in this embodiment corresponds to the fire hole 101, and the specific shape of the welding region 12a matches the shape of the fire hole 101, so the center of the welding region 12a actually corresponds to the center of the fire hole 101.

[0039] In an embodiment of the present application, the welding region 12a is provided with at least two welding spots 13, and the at least two welding spots 13 are randomly spaced and distributed in the welding region 12a.

[0040] In an embodiment, it is taken as an example that at least two welding spots 13 are provided at each welding region 12a. It can be understood that in actual application, the specific positions of the at least two welding spots 13 may not be limited, for example, they may be distributed in a matrix, an annular array, symmetrically, scattered or other forms.

[0041] In order to achieve a more uniform airflow, in an embodiment, the at least two welding spots 13 may be spaced apart along the length direction or the width direction of the welding region 12a, so that the overall combustion flame distribution of the burner head 1 is more uniform and stable.

[0042] In an embodiment, the quantity of the welding spots 13 may be determined according to actual conditions, for example, 2, 3 or more.

[0043] In order to further improve the flame uniformity, as shown in FIG. 6 and FIG. 7, in an embodiment of the present application, the metal mesh 12 has multiple layers, and the multiple layers of the metal mesh 12 are welded by welding spots 13.

[0044] In an embodiment, the use of multiple layers of metal mesh 12 can further disperse the air and gas so that the gas and air are evenly mixed. There is a certain gap between the metal meshes 12, which will not completely block the mixed airflow, so that the resistance will not be increased. In addition, the metal meshed 12 can shield each other to prevent the airflow from blowing directly through the fire hole 101 and easily flaming out, and can also achieve a better anti-backfire effect.

[0045] In practical applications, the quantity of layers of the metal mesh 12 is related to the mesh of the metal mesh 12. The metal mesh 12 with more meshes has fewer layers, and the metal mesh 12 with fewer meshes has more layers. For example, the quantity of layers of the metal mesh 12 can be 2 to 10 layers, specifically 2 layers, 3 layers, 4 layers, 5 layers, 6 layers, 7 layers, 8 layers, 9 layers or 10 layers. The mesh of the metal mesh 12 can be 20 to 100 meshes, specifically 20 meshes, 40 meshes, 50 meshes, 60 meshes, 80 meshes or 100 meshes, etc. Considering that too many layers may lead to insufficient supply of airflow, and the metal mesh 12 with a larger mesh is expensive, as an example, the metal mesh 12 can be a combination of 4 layers of mesh and 40 meshes.

[0046] In an embodiment, when the welding spot 13 is provided at the welding region 12a, the multi-layer metal mesh 12 is welded through the welding spot 13, that is, the multi-layer metal mesh 12 is fused together at the welding spot 13, so that the multi-layer metal mesh 12 is pulled by the welding spot 13, the resistance at the welding spot 13 is the largest, and the resistance gradually changes from the center position of the welding spot 13 to the surrounding region to the normal resistance of the multi-layer metal mesh 12 in the natural state. The gas flow rate also gradually increases from the center position adjacent to the welding spot 13 to the surrounding region, so as to achieve a better flame stabilization effect.

[0047] In an embodiment of the present application, as shown in FIG. 1 to FIG. 5, the burner cover 11 includes a panel 111 and two side plates 112. The panel 111 has a hollow region, and is provided with a plurality of partition ribs 113 extending along the width direction of the panel 111 in the hollow region. The plurality of partition ribs 113 are spaced apart along the length direction of the panel 111 to separate the hollow region into a plurality of fire holes 101. The metal mesh 12 is provided at the back side of the panel 111, and the two side plates 112 are respectively connected to two sides of the width of the panel 111.

[0048] In an embodiment, the structure of the burner cover 11 will be illustrated. The panel 111 and the two side plates 112 roughly form a n-shaped structure. When applied to the fire grate, the panel 111 is provided at the top of the housing 2, and the two side plates 112 are inserted in the gas channel and fixed to the two side walls of the housing 2 respectively. The two side plates 112 can be an integrally formed structure or a split structure with the panel 111. In order to facilitate production and manufacturing, the burner cover 11 can be selected as an integral sheet metal part, and the two side plates 112 are respectively formed by bending and extending the width of the panel 111.

[0049] The hollow region of the panel 111 corresponds to the air outlet 201 of the housing 2. A plurality of partition ribs 113 extending along the width are provided in the hollow region. The plurality of partition ribs 113 are spaced apart in the length direction of the panel 111 to separate the hollow region into a plurality of fire holes 101. It can be understood that the partition ribs 113 play a role in strengthening the structure on the one hand, and on the other hand, play a role in separating the plurality of fire holes 101. The plurality of fire holes 101 are spaced apart in the length direction of the panel 111, and a fire hole 101 is formed between each two adjacent partition ribs 113, which plays a role in uniform air outlet, making the flame combustion more stable.

[0050] Accordingly, the metal mesh 12 is provided at the back of the panel 111. In an embodiment, the metal mesh 12 and the separation rib 113 are fixed by welding.

[0051] The present application further provides a fire grate, as shown in FIG. 1 and FIG. 2, which includes a housing 2 and a burner head 1. The specific structure of the burner head 1 refers to the above embodiment. Since the fire grate adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. An airflow channel is formed in the housing 2; the burner head 1 is provided at the top of the housing 2, and multiple fire holes 101 all communicate with the airflow channel.

[0052] In an embodiment, the housing 2 is provided with an airflow channel and an air inlet 202 and an air outlet 201 connected to the airflow channel. The air inlet 202 is used to connect with an airflow source, and the airflow source includes air and gas. The gas and air enter the airflow channel from the air inlet 202, are pre-mixed in the airflow channel, and then flow to the air outlet 201. After being dispersed and diverted by the metal mesh 12, they are ejected from multiple fire holes 101 and ignited to form a combustion flame.

[0053] In an embodiment, the housing 2 is formed by splicing two roughly symmetrical sheet metal parts. After the two sheet metal parts are pressed accordingly, an airflow channel is formed therein, and the air outlet 201 is formed at the top of the two sheet metal parts. The burner cover 11 is provided at the air outlet 201. The burner cover 11 includes a panel 111 and two side plates 112 provided at two sides of the width of the panel 111. The two side plates 112 are inserted in the airflow channel and fixedly connected to the inner wall of the housing 2. The panel 111 is provided at the top of the housing 2. It can be understood that the two side plates 112 are fixedly connected to the two sheet metal parts respectively, so that the panel 111 covers the air outlet 201. The metal mesh 12 is provided below the panel 111, so that the airflow in the airflow channel is first dispersed and diverted by the metal mesh 12 and then ejected from the fire hole 101 on the panel 111.

[0054] In an embodiment, as shown in FIG. 1 and FIG. 2, a plurality of recesses 21 are provided at two sides of the width direction of the housing 2. The plurality of recesses 21 are spaced apart along the length direction of the housing 2, and the plurality of recesses 21 are abutted and fixed with corresponding side plates 112. The panel 111 is provided with a plurality of partition ribs 113 spaced apart along the length direction of the panel 111, and the plurality of partition ribs 113 are provided in a one-to-one correspondence to the plurality of recesses 21.

[0055] In an embodiment, the separation ribs 113 can enhance the strength of the burner cover 11 and prevent it from being deformed or twisted. When the burner cover 11 is assembled with the housing 2, the recess 21 plays a role in positioning and installing the side plate 112. The side plate abuts against the recess 21, and the two can be welded and fixed. By providing the distribution of the separation ribs 113 in a one-to-one correspondence with the recesses 21, it can play a supporting role for the welding position, prevent the recesses 21 from being sunken when being welded to the side plate, and ensure the strength of the assembly structure.

[0056] The present application further provides a fire grate, which aims to form a mixing flow cavity between the rectification plate 3 and the burner cover 220 by providing a rectification plate 3 at intervals below the fire holes of the fire grate, thereby lowering the airflow speed, achieving a uniform flame, reducing the flame height, and sufficiently reducing the production of nitrogen oxides through combustion.

[0057] In the embodiment of the present application, as shown in FIG. 8 to FIG. 10, the fire grate includes a housing 2, a burner cover 220 and a rectification plate 3.

[0058] An airflow channel is formed in the housing 2, and the burner cover 220 is provided at the top of the housing 2 and is provided with a plurality of fire holes 2012 connected to the airflow channel. The rectification plate 3 is provided in the airflow channel and is spaced apart below the burner cover 220. The rectification plate 3 extends from one end of the housing 2 in the length direction to another end in the length direction, and the rectification plate 3 is provided with vents (301/302), and the distance h between the upper surface of the rectification plate 3 and the plate surface of the burner cover 220 where the fire holes 2012 are provided is greater than or equal to 1 mm.

[0059] The fire grate is applied to the burner. The air inlet 102 of the airflow channel in the housing 2 is connected to the airflow source. The airflow source includes air and gas. The gas and air enter the airflow channel from the air inlet 102, flow to the air outlet 1012 after being premixed in the airflow channel, and are ejected through the multiple fire holes 2012 of the burner cover 220 and ignited to form a combustion flame. In an embodiment, the multiple fire holes 2012 can have the same or different areas and the same or different shapes. The shape of the fire hole 2012 can be determined according to actual conditions, for example, it can be circular, triangular, square, rectangular or other irregular shapes.

[0060] A rectification plate 3 is provided below the burner cover 220, so that the airflow first passes through the rectification plate 3 and then enters the fire hole 2012 of the burner cover 220. It can be understood that a mixing chamber is formed between the rectification plate 3 and the burner cover 220, and the airflow can first mix in the mixing chamber after passing through the rectification plate 3, thereby reducing the flow rate, thereby reducing the speed of flowing out of the fire hole 2012, and avoiding flame failure.

[0061] In actual application, the distance h between the rectification plate 3 and the burner cover 220 should not be too small. If it is too small, some fire holes 2012 of the burner cover 220 are easily blocked by the rectification plate 3 and cannot emit gas. Therefore, in this embodiment, the distance h between the upper surface of the rectification plate 3 and the plate surface of the burner cover 220 where the fire holes 2012 are provided is greater than or equal to Imm, so that there is enough space between the rectification plate 3 and the burner cover 220. Therefore, the airflow can be smoothly mixed and diffused between the rectification plate 3 and the burner cover 220, further improving the uniformity of airflow distribution, and making the multiple fire holes 2012 on the burner cover 220 emit gas more evenly, thereby achieving a better flame stabilization effect.

[0062] In summary, in the fire grate according to the technical solution of the present application, an airflow channel is formed in the housing 2, and a burner cover 220 with multiple fire holes 2012 is provided at the top of the housing 2, so that the airflow can be ejected from the multiple fire holes 2012 for combustion. A rectification plate 3 is provided below the burner cover 220, and the distance h between the rectification plate 3 and the plate body of the burner cover 220 where the fire holes 2012 are provided is greater than or equal to Imm, so that a sufficient mixing chamber is formed between the rectification plate 3 and the burner cover 220. Therefore, the airflow can be smoothly mixed and diffused between the rectification plate 3 and the burner cover 220, and the uniformity of airflow distribution can be improved while the flow speed can be reduced, so as to achieve the purpose of uniform flame, reduced flame height, and sufficient combustion to reduce the generation of nitrogen oxides.

[0063] In an embodiment of the present application, as shown in FIG. 9 to FIG. 12, in the length direction of the rectification plate 3, the rectification plate 3 has a first region 3a and a second region 3b provided at two ends of the first region 3a, the first region 3a is provided with a plurality of first vents 301, and the unit air passing area of the second region 3b (i.e., an air passing area per unit area of the second region 3b) is smaller than the unit air passing area of the first region 3a (i.e., an air passing area per unit area of the first region 3a).

[0064] The rectification plate 3 has a first region 3a and two second regions 3b in the length direction, and the two second regions 3b are provided at two sides of the first region 3a, so that the two second regions 3b correspond to the fire holes 2012 at the two ends in the length direction of the burner cover 220, and the first region 3a corresponds to the fire holes 2012 in the middle area in the length direction of the burner cover 220. It can be understood that when the gas flows toward the gas outlet 1012, the rectification plate 3 can generate resistance to the airflow, which plays a role in lowering the airflow speed. By providing the unit gas passing area of the second region 3b to be smaller than the unit gas passing area of the first region 3a, the resistance of the second region 3b to the airflow can be increased, and the airflow speed at the fire holes 2012 at the two ends can be reduced, so as to avoid the occurrence of flame-out and flame separation at the fire holes 2012 at the two ends, so as to achieve the purpose of reducing the overall flame height, make the combustion more complete, and reduce the emission of nitrogen oxides.

[0065] The unit air passing area of the second region 3b is smaller than that of the first region 3a. It is understandable that the air passing area of the second region 3b can be 0. The second region 3b is a closed region without openings. The airflow can flow from the first airflow hole 301 of the first region 3a into the space between the rectification plate 3 and the burner cover 220 and diffuse to both ends, so that the multiple fire holes 2012 on the burner cover 220 can all be discharged for combustion. In an embodiment, the second region 3b can be an opening region, the unit opening area of the second region 3b (i.e., an opening area per unit area of the second region 3b) is smaller than that of the first region 3a (i.e., an opening area per unit area of the first region 3a), so as to ensure that both ends of the rectification plate 3 have sufficient resistance to the airflow, so as to lower the airflow speed at both ends.

[0066] In addition, based on the aforementioned embodiments, it can be known that the distance h between the upper surface of the rectification plate 3 and the plate surface of the burner cover 220 where the fire holes 2012 are provided is greater than or equal to Imm, so that there is enough space between the rectification plate 3 and the burner cover 220, and the airflow can be smoothly diffused from the first region 3a to the second regions 3b on two sides. Then, even if the second region 3b is a closed region, it can be ensured that gas is ejected and burned from the fire holes 2012 at both ends.

[0067] Furthermore, the specific gas distribution mode on the second region 3b of the rectification plate 3 can be determined according to the actual situation.

[0068] In an embodiment, as shown in FIG. 11, the air passing area of the second region 3b is 0, and the second region 3b is a closed region. The airflow only passes through the plurality of first air passing holes 301 on the first region 3a, and after entering the space between the rectification plate 3 and the burner cover 220, it can diffuse to both ends, so that the plurality of fire holes 2012 on the entire burner cover 220 can all be used for combustion.

[0069] In an embodiment, as shown in FIG. 12, the second region 3b is an opening region; the unit opening area of the second region 3b is smaller than the unit opening area of the first region 3a. At this time, the airflow can pass through the multiple first vents 301 on the first region 3a and the multiple second vents 302 on the second region 3b at the same time. By providing the unit opening area of the second region 3b to be smaller than the unit opening area of the first region 3a, the two ends of the rectification plate 3 have sufficient resistance to the airflow, and the airflow speed at the two ends can be reduced. Specifically, the multiple second vents 302 are spaced apart along the length direction of the rectification plate 3 to play a role in breaking up the airflow to make the airflow more uniform.

[0070] In an embodiment, the effect of better uniform flame can be achieved by distributing the plurality of second vents 302 or setting the opening area. As an example, the distance between two adjacent second vents 302 can be gradually increased from adjacent to the first region 3a to distant from the first region 3a. Such an arrangement can make the resistance of the part distant from the first region 3a greater than the resistance of the part adjacent to the first region 3a, so that the air volume at both ends of the rectification plate 3 will be less than the air volume adjacent to the middle position. At the same time, the airflow entering from the first vent 301 will also diffuse to both ends, so that the airflow distribution between the rectification plate 3 and the burner cover 220 is more uniform, so that it can be more evenly ejected from the plurality of fire holes 2012, so that the flame combustion is more stable. Or, as an example, the opening area of the plurality of second vents 302 gradually decreases from adjacent to the first region 3a to distant from the first region 3a. Such an arrangement can make the resistance of the portion distant from the first region 3a greater than the resistance of the portion adjacent to the first region 3a, so the air volume at both ends of the rectification plate 3 will be smaller than the air volume adjacent to the middle position. At the same time, the airflow entering from the first vent 301 will also diffuse to both ends, making the airflow distribution between the rectification plate 3 and the burner cover 220 more uniform, so that it can be more evenly ejected from multiple fire holes 2012, making the flame combustion more stable.

[0071] In an embodiment, the shape of the second vent 302 can be determined according to actual conditions, such as circular, triangular, square, rectangular, strip, or other irregular shapes. The shape of the second vent 302 can be identical to or different from that of the first vent 301.

[0072] In an embodiment of the present application, as shown in FIG. 11 and FIG. 12, the multiple first vents 301 include multiple first sub-vents 301a and multiple second sub-vents 301b, the opening area of the first sub-vents 301a is different from the opening area of the second sub-vents 301b, and the multiple first sub-vents 301a and the multiple second sub-vents 301b are alternately provided along the length direction of the rectification plate 3.

[0073] By providing the multiple first vents 301 as the first sub-vents 301a and the multiple second sub-vents 301b with different opening areas, the air and fuel gas mixture in the airflow channel can flow from the multiple first sub-vents 301a and the multiple second sub-vents 301b with different opening areas to the space above the rectification plate 3. In addition, since the multiple first sub-vents 301a and the multiple second sub-vents 301b are alternately spaced apart, the airflow can be broken up when passing through the rectification plate 3, thereby making the airflow distribution between the rectification plate 3 and the burner cover 220 more uniform, so that the airflow can be more evenly distributed when it flows out from the fire hole 2012, thereby playing a role in stabilizing the flame.

[0074] It is understandable that the shapes of the first sub-vents 301a and the second sub-vents 301b can be determined according to actual conditions, such as strip holes, square holes, elliptical holes or holes of other shapes. The shapes of the first and second sub-vents 301a, 301b can be the same or different.

[0075] In an embodiment, there are two first sub-vents 301a between each two adjacent second sub-vents 301b, and the two first sub-vents 301a are spaced apart in the width direction of the rectification plate 3. The second sub-vent 301b is provided at the middle position in the width direction of the rectification plate 3, and the hole edge of the second sub-vent 301b protrudes toward the interval between the corresponding two first sub-vents 301a.

[0076] In an embodiment, there are two first sub-vents 301a spaced apart in the width direction between each two adjacent second sub-vents 301b, and such arrangement can further divert and disperse the air and fuel gas mixture. It can be understood that there is a gap between the two first sub-vents 301a, which can not only divert the gas but also enhance the structural strength of the rectification plate 3.

[0077] The second sub-vents 301b are provided at the middle of the width direction of the rectification plate 3, and can be staggered with the air passing areas of the two first sub-vents 301a, so as to further break up the airflow and make the airflow more uniform. In an embodiment, the hole edge of the second sub-vent 301b protrudes toward the interval between the corresponding two first sub-vents 301a, which can not only increase the air passing area of the second sub-vent 301b, but also avoid affecting the area size of the first sub-vent 301a compared to the solution of protruding toward the first sub-vent 301a. Therefore, such a design can ensure the overall structural strength while increasing the air passing area.

[0078] In an embodiment of the present application, as shown in FIG. 11 and FIG. 12, the length of the second region 3b (one second region 3b) is L2, and the length of the rectification plate 3 is L, satisfying:

[00001]$\frac{1}{7}LL2\frac{1}{5}L.$

[0079] It can be understood that the two second regions 3b are provided at two ends of the length direction of the rectification plate 3, and the second regions 3b play the role of lowering the airflow speed of the fire holes 2012 at both ends of the fire grate. The first region 3a is located between the two second regions 3b, and the first region 3a needs to ensure that there is sufficient airflow passing through. In practical applications, the length of the second region 3b should not be too short or too long. If it is too short, it will not play the role of lowering the airflow speed of the fire holes 2012 at both ends. If it is too long, it is easy to cause excessive airflow resistance and insufficient air output. Based on this, this embodiment sets the relationship between the length L2 of the second region 3b and the length L of the rectification plate 3 to satisfy

[00002]$\frac{1}{7}LL2\frac{1}{5}L,$

so as to lower the airflow speed of the fire holes 2012 at both ends and ensure sufficient air output. If the length L1 of the first region 3a is used as an example, it satisfies:

[00003]$\frac{3}{5}LL1\frac{5}{7}L.$

[0080] In order to achieve a better uniform flame effect, in an embodiment, the relationship between the length L2 of the second region 3b and the length L of the rectification plate 3 is set to satisfy

[00004]$L2=\frac{1}{6}L.$

[0081] In an embodiment of the present application, as shown in FIG. 8 to FIG. 10, the fire grate further includes a metal mesh 4 provided below the burner cover 220, and the metal mesh 4 covers the plurality of fire holes 2012.

[0082] In an embodiment, by providing the metal mesh 4 under the burner cover 220, the temperature of the metal mesh 4 can be reduced during the combustion process, avoiding high temperature burning, and increasing the service life of the metal mesh 4. Each mesh hole is a tiny fire hole, and is covered with multiple fire holes 2012, which greatly increases the total combustion fire hole area, and also reduces the unit fire hole combustion heat intensity, which is beneficial to reduce the generation of nitrogen oxides.

[0083] In order to further improve the flame uniformity, the quantity of layers of the metal mesh 4 can be multiple layers. The multiple layers of the metal mesh 4 can further disperse the air and the gas so that the gas and the air can be mixed evenly. At the same time, the multiple layers of the metal mesh 4 can increase the resistance and achieve a better anti-backfire effect. In practical applications, the quantity of layers of the metal mesh 4 is related to the mesh of the metal mesh 12. The metal mesh 4 with more meshes has fewer layers, and the metal mesh 4 with fewer meshes has more layers. For example, the quantity of layers of the metal mesh 4 can be 2 to 10 layers, specifically 2 layers, 3 layers, 4 layers, 5 layers, 6 layers, 7 layers, 8 layers, 9 layers or 10 layers. The mesh of the metal mesh 4 can be 20 to 100 meshes, specifically 20 meshes, 40 meshes, 50 meshes, 60 meshes, 80 meshes or 100 meshes, etc.

[0084] Considering that too many layers may result in insufficient airflow supply and that metal meshes with larger mesh sizes are expensive, as an example, the metal mesh 4 can be a combination of 2 to 5 layers of mesh and 20 to 50 meshes.

[0085] In an embodiment of the present application, as shown in FIG. 8 to FIG. 10, the burner cover 220 includes a top plate 212 and two side plates 22 connected to the top plate 212 on two sides of the width, the two side plates 22 are inserted in the gas channel, the top plate 212 is provided with a plurality of fire holes 2012, and the plurality of fire holes 2012 are spaced apart along the length direction of the top plate 212.

[0086] In an embodiment, the structure of the burner cover 220 is illustrated. The two side plates 22 and the top plate 212 roughly form a n-shaped structure. The top plate 212 is provided at the top of the housing 2. The two side plates 22 are inserted in the gas passage and are respectively welded and fixed to the two side walls of the housing 2. The two side plates 22 can be an integrally formed structure or a separate structure with the top plate 212. In order to facilitate production and manufacturing, the burner cover 220 can be an integral sheet metal piece, and the two side plates 22 are respectively formed by bending and extending the two sides of the width direction of the top plate 212.

[0087] The plurality of fire holes 2012 are spaced apart along the length direction of the top plate 212, which plays a role in uniform gas discharge, making the flame combustion more stable. Accordingly, the metal mesh 4 is provided below the top plate 212, and the metal mesh 4 and the top plate 212 can be fixed by welding.

[0088] In an embodiment of the present application, as shown in FIGS. 8 to 10, side sheets 31 are respectively provided at two sides of the rectification plate 3 in the width direction, and the side sheets 31 are inserted in the burner cover 220.

[0089] It can be understood that the two side sheets 31 play the role of installing and fixing the rectification plate 3 and increasing the structural strength of the rectification plate 3. In an embodiment, the two side sheets 31 can be fixedly connected to the housing 2, or can be fixedly connected to the burner cover 220. In an embodiment, considering the convenience of installation, the side sheets 31 are fixedly connected to the burner cover 220. During assembly, the rectification plate 3 can be first installed on the burner cover 220, and then the whole can be inserted in the housing 2, which simplifies the assembly structure and improves the installation efficiency.

[0090] In an embodiment, the side sheet 31 is fixed to the side plate 22 of the burner cover 220 by welding.

[0091] In an embodiment, the side sheets 31 and the rectification plate 3 are an integrated sheet metal structure, and the two side sheets 31 can be formed by bending the two side edges of the rectification plate 3.

[0092] The present application further provides a gas device, which includes a fire grate. The specific structure of the fire grate refers to the above embodiment. Since the gas device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0093] As an example, the gas device can be a burner, such as an atmospheric burner, a thick-lean burner, a water-cooled burner, or other forms of burners.

[0094] As an example, the gas device can also be a gas water heater, a boiler, or other equipment.

[0095] The above are only some embodiments of the present application, and are not intended to limit the scope of the present application. Under the concept of the present application, any equivalent structure transformation made by using the description and accompanying drawings of the present application, or directly or indirectly applied in other related technical fields, is included within the scope of the present application.