CN220567245U - Fire grate and combustion device - Google Patents

Abstract

The utility model discloses a fire grate and combustion equipment. The fire grate comprises a fire grate body and a metal net, wherein an air flow channel is formed in the fire grate body, a plurality of air outlet holes communicated with the air flow channel are formed in the fire grate body, the air outlet holes are distributed at intervals along the length direction of the fire grate body, and at least part of the edges of the air outlet holes are arranged in a nonlinear manner; the metal mesh is arranged on the fire grate body at positions corresponding to the plurality of air outlet holes. According to the technical scheme, the air and the fuel gas can be fully mixed, so that the combustion is more complete, stable and uniform flame is formed, and the emission of nitrogen oxides is reduced.

Description

Fire grate and combustion device

Technical Field

The utility model relates to the technical field of gas equipment, in particular to a fire grate and combustion equipment.

Background

The burner is a core component of the gas plant. In the burner of the gas water heater in the related art, in the low nitrogen oxide combustion, a full premix combustion technology, a thick and thin combustion technology and a water cooling combustion technology are adopted. The fire hole structure of the burner generally adopts a single fire hole structure, and the single fire hole structure has the advantages of small fire hole area, high fire hole strength of combustion, poor smoke performance of instant combustion, higher nitrogen oxide and incapability of meeting the low-nitrogen emission performance requirement.

Disclosure of Invention

The utility model mainly aims to provide a fire grate, which aims to achieve uniform flame, reduce flame height, achieve full combustion and reduce emission of nitrogen oxides.

In order to achieve the above object, the present utility model provides a fire grate, comprising:

the fire grate body is internally provided with an air flow channel, the fire grate body is provided with a plurality of air outlet holes communicated with the air flow channel, the air outlet holes are distributed at intervals along the length direction of the fire grate body, and at least part of the edges of the air outlet holes are arranged in a nonlinear manner; and

the metal net is arranged on the fire grate body at positions corresponding to the plurality of air outlet holes.

In an embodiment, at least one of the air outlet holes is arranged in a non-straight line at two side edges of the fire grate body in the width direction.

In an embodiment, at least one of the air outlet holes is provided in a tooth shape at both side edges in the width direction of the fire grate body.

In an embodiment, the plurality of air outlet holes include a plurality of first air outlet holes and a plurality of second air outlet holes, the opening area of the first air outlet holes is different from the opening area of the second air outlet holes, and the plurality of first air outlet holes and the plurality of second air outlet holes are alternately arranged along the length direction of the fire row body at intervals;

the hole edges of the first air outlet holes and/or the second air outlet holes are arranged in a tooth shape.

In an embodiment, the opening area of the first air outlet hole is larger than the opening area of the second air outlet hole, and two side edges of the first air outlet hole in the width direction of the fire grate body are arranged in a tooth shape.

In an embodiment, the first air outlet holes comprise two first sub air outlet holes, and the two first sub air outlet holes are arranged at intervals in the width direction of the fire grate body;

and in the width direction of the fire row body, the outer side edges of the two first sub air outlet holes are arranged in a tooth shape.

In one embodiment, the fire grate body comprises a top plate and two side plates connected with the top plate and extending towards the same side of the top plate, and the air flow channel is formed between the two side plates;

the plurality of air outlet holes are formed in the top plate, and the metal net is arranged on the inner side of the top plate.

In an embodiment, the fire grate further comprises a flame stabilizing device sleeved on the upper portion of the fire grate body, a cavity is formed in the flame stabilizing device, the top of the cavity is open, a gap is formed between the side wall of the cavity and the side plate, and a plurality of side air outlets which are communicated with the gap and the air flow channel are formed in the side plate.

In an embodiment, the plurality of side air outlets are distributed at intervals along the length direction of the side plate in a single row, and the flow area of the bottom of the side air outlet is larger than that of the upper part of the side air outlet;

or, the side plate is provided with at least two rows of side air outlets in the height direction, a plurality of side air outlets in the same row are distributed at intervals along the length direction of the side plate, and a plurality of side air outlets in two adjacent rows are distributed in a staggered manner.

In an embodiment, the flame stabilizing device comprises two flame stabilizing plates which are respectively arranged at the outer sides of the two side plates, and the two flame stabilizing plates are respectively provided with a plurality of lateral convex hulls which are arranged at intervals along the length direction of the side plates.

In an embodiment, the plurality of lateral convex hulls comprises a plurality of positioning convex hulls facing away from the cavity, and/or a plurality of inner convex hulls recessed toward the side plates;

and/or the upper edge of the flame stabilizing sheet is provided with a plurality of notches.

In order to achieve the above object, the present utility model also provides a combustion apparatus comprising the fire grate.

According to the technical scheme, the fire row body is internally provided with the air flow channel, the fire row body is provided with the plurality of air outlet holes, the plurality of air outlet holes are distributed at intervals along the length direction of the fire row body, the edge length of the air outlet holes is increased by non-linearly arranging at least part of the edges of the air outlet holes, the non-linearly arranging can play a role in dispersing air flow, the flame combustion area is increased, and the flame height is reduced; simultaneously, set up the metal mesh corresponding the position of a plurality of ventholes, can intensive mixing air and gas for the burning is more abundant, forms stable and even flame, reduces nitrogen oxide's emission.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a fire grate according to an embodiment of the present utility model;

FIG. 2 is a top view of the embodiment of FIG. 1;

FIG. 3 is a cross-sectional view of the embodiment of FIG. 1;

FIG. 4 is a schematic diagram of a fire grate body and a metal mesh in an embodiment of the present utility model;

FIG. 5 is a top view of the embodiment of FIG. 4;

FIG. 6 is a cross-sectional view taken at A-A of FIG. 4;

FIG. 7 is a schematic view of an embodiment of a fire grate body according to the present utility model;

FIG. 8 is a top view of the embodiment of FIG. 7;

FIG. 9 is a cross-sectional view at B-B in FIG. 7;

FIG. 10 is a schematic view of another embodiment of a fire grate body according to the present utility model;

FIG. 11 is a schematic view of a flame stabilizing device according to an embodiment of the present utility model;

FIG. 12 is a top view of the embodiment of FIG. 11;

FIG. 13 is a side view of the embodiment of FIG. 11;

FIG. 14 is a cross-sectional view taken at C-C of FIG. 11;

FIG. 15 is a top view of a plurality of flame holding devices, a plurality of flame holding bodies, and a metal mesh according to an embodiment of the present utility model.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

Meanwhile, the meaning of "and/or" and/or "appearing throughout the text is to include three schemes, taking" a and/or B "as an example, including a scheme, or B scheme, or a scheme that a and B satisfy simultaneously.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a fire grate, which aims to realize uniform flame, reduce flame height, reduce flame combustion heat intensity, fully burn and reduce nitrogen oxide generation by improving the structure of air outlet holes at the top of the fire grate and increasing flame area.

In an embodiment of the present utility model, as shown in fig. 1 to 3, the fire grate includes a fire grate body 100 and a metal mesh 200.

An airflow channel 101 is formed in the fire grate body 100, the fire grate body 100 is provided with a plurality of air outlet holes 111 communicated with the airflow channel 101, the plurality of air outlet holes 111 are distributed at intervals along the length direction of the fire grate body 100, and at least part of the hole edges of at least one air outlet hole 111 are arranged in a nonlinear manner; the metal mesh 200 is disposed on the fire grate body 100 at positions corresponding to the plurality of air outlet holes 111.

It will be appreciated that the fire grate is mainly used in a burner, the air inlet of the air flow channel 101 in the fire grate body 100 is connected with an air flow source, the air flow source comprises air and fuel gas, the fuel gas and the air enter the air flow channel 101 from the air inlet, the fuel gas and the air are premixed in the air flow channel 101, and then flow out through the plurality of air outlet holes 111 of the fire grate body 100 and are ignited to form a combustion flame. The plurality of air outlet holes 111 are arranged at intervals along the length direction of the fire grate body 100, so that the air and the fuel gas are fully mixed, the metal net 300 is arranged at the position of the fire grate body 100 where the air outlet holes 111 are arranged, the metal net 300 further plays a role in scattering the gas, and the mixed gas can be fully combusted after being ignited, so that stable and uniform flame is formed. In addition, the metal mesh 300 can prevent safety accidents such as explosion caused by tempering.

In this embodiment, at least part of the hole edges of at least one of the plurality of air outlet holes 111 are set in a nonlinear manner, so that the edge length of the air outlet hole 111 is prolonged, the nonlinear manner can play a role in dispersing air flow, the area of flame combustion is increased, the combustion is more sufficient, the flame height is reduced, and the emission of nitrogen oxides is reduced. In practical applications, at least a portion of the edges of the air outlet aperture 111 are disposed in a non-linear configuration, and it is understood that a portion of the edges of the air outlet aperture 111 are non-linear or all of the edges are non-linear. The non-linear arrangement of the edges is understood to mean that the edges are not flat, for example, the hole edges of the air outlet holes 111 may have a tooth structure, a step structure, a wave structure or other concave-convex structures, etc., and the specific shape of the edges of the air outlet holes 111 may be determined according to practical situations, which may not be limited herein.

It should be noted that, in this embodiment, the hole edge of at least one air outlet hole 111 is set in a non-straight line, which may be that the hole edge of one, two or more air outlet holes 111 is set in a non-straight line, and when the number of air outlet holes 111 whose hole edges are set in a non-straight line is two or more, the hole edges of two adjacent air outlet holes 111 are all set in a non-straight line, or the hole edges of two or more air outlet holes 111 which are spaced apart are set in a non-straight line. The specific distribution manner may be determined according to practical situations, and is not limited herein.

The metal mesh 200 is disposed on the fire grate body 100 corresponding to the positions of the plurality of air outlet holes 111, it can be appreciated that the metal mesh 200 may be disposed above or below the plurality of air outlet holes 111, and in practical application, since the flame burns above the fire grate body 100, the requirements of heat resistance, strength, etc. of the metal mesh 200 above the air outlet holes 111 will be higher than those of the metal mesh 200 below the air outlet holes 111, and in consideration of cost, etc., the metal mesh 200 is optionally disposed below the air outlet holes 111. In order to further improve the flame uniformity, the number of layers of the metal mesh 200 may be multiple, and the multiple layers of metal mesh 200 may further scatter air and gas, so that the gas and air may be uniformly mixed, and meanwhile, the multiple layers of metal mesh 200 may increase the resistance, so as to achieve a better tempering preventing effect. In practical application, the number of layers of the metal mesh 200 is related to the number of the metal mesh 200, and the number of layers of the metal mesh 200 with a large number of the metal mesh 200 is small, and the number of layers of the metal mesh 200 with a small number of the metal mesh can be 2-10 layers, specifically 2 layers, 3 layers, 4 layers, 5 layers, 6 layers, 7 layers, 8 layers, 9 layers or 10 layers. The mesh size of the metal mesh 200 may be 20 mesh to 100 mesh, specifically 20 mesh, 40 mesh, 50 mesh, 60 mesh, 80 mesh, 100 mesh, or the like. Considering that an excessive number of layers may result in an insufficient supply of air flow, and that a large mesh wire is expensive, the wire 200 may be a 4-layer wire, 40-mesh combination, as an example.

In the fire row of the technical scheme of the utility model, the air flow channel 101 is formed in the fire row body 100, the fire row body 100 is provided with the plurality of air outlet holes 111, the plurality of air outlet holes 111 are distributed at intervals along the length direction of the fire row body 100, and the edge length of the air outlet holes 111 is increased by arranging at least part of the hole edges of at least one air outlet hole 111 in a nonlinear manner, and the nonlinear arrangement can play a role of dispersing air flow, so that the flame combustion area is increased, and the flame height is reduced; meanwhile, the metal mesh 200 is arranged at the positions corresponding to the plurality of air outlet holes 111, so that air and fuel gas can be fully mixed, combustion is more complete, stable and uniform flame is formed, and emission of nitrogen oxides is reduced.

In an embodiment of the present application, referring to fig. 2, 5, 8 and 15, at least one air outlet hole 111 is disposed at two side edges of the fire grate body 100 in the width direction in a non-linear manner.

It can be appreciated that the fire row structure is formed by connecting a plurality of fire row bodies 100 side by side, the plurality of fire row bodies 100 are sequentially arranged in the width direction of the fire row bodies 100, and a gap for supplying secondary air can be formed between two adjacent fire row bodies 100.

In practical use, the nonlinear shape of the both side edges of the air outlet holes 111 in the width direction of the fire grate body 100 may be the same or different. When the shapes of the two side edges are the same, the die design can be simplified, and the manufacturing process efficiency can be improved. When the shapes of the edges of both sides are different, when the multi-row fire grate bodies 100 are connected side by side, the flames at the top of the fire grate structure can be more uniform, and the flame intensity is reduced.

In an embodiment, referring to fig. 2, 5, 8 and 15, at least one of the air outlet holes 111 is disposed in a tooth shape at two side edges of the fire grate body 100 in the width direction.

In this embodiment, through setting up the venthole 111 into the profile of tooth structure at the width direction on both sides edge of fire row body 100, prolonged the length of venthole 111 width direction on both sides edge, increased flame area, the profile of tooth structure can disperse the air current simultaneously for the gaseous mixture of air and gas distributes more evenly at fire row body 100 top, so alright make the gas fully burn.

The tooth-shaped structures may be continuously extended along the edges of the air outlet holes 111, or may be intermittently periodically distributed along the edges of the air outlet holes 111, as an example.

In an embodiment of the present application, referring to fig. 2, 5, 8 and 15, the plurality of air outlet holes 111 includes a plurality of first air outlet holes 111a and a plurality of second air outlet holes 111b, the opening area of the first air outlet holes 111a is different from the opening area of the second air outlet holes 111b, and the plurality of first air outlet holes 111a and the plurality of second air outlet holes 111b are alternately arranged along the length direction of the fire grate body 100 at intervals; the hole edges of the first air outlet holes 111a and/or the second air outlet holes 111b are arranged in a tooth shape.

In this embodiment, the plurality of air outlet holes 111 at the top of the fire grate body 100 are set to be the plurality of first air outlet holes 111a and the plurality of second air outlet holes 111b with different opening areas, so that the air and the gas mixture in the airflow channel 101 of the fire grate body 100 can flow out from the plurality of first air outlet holes 111a and the plurality of second air outlet holes 111b with different opening areas, and the plurality of first air outlet holes 111a and the plurality of second air outlet holes 111b are alternately arranged at intervals, so that the flame is distributed more uniformly at the top of the fire grate body 100, the effect of stabilizing flame is achieved, and the flame height is reduced.

It is understood that the shape and structure of the first air outlet hole 111a and the second air outlet hole 111b may be according to practical situations, such as a bar hole, a square hole, an oval hole, or other holes. The shapes of the first and second air outlet holes 111a and 111b may be the same or different. The hole edges of the plurality of first air outlet holes 111a and/or the plurality of second air outlet holes 111b may be disposed in a toothed shape, and as an example, only the hole edges of the plurality of first air outlet holes 111a may be disposed in a toothed shape, or only the hole edges of the plurality of second air outlet holes 111b may be disposed in a toothed shape, or both the hole edges of the plurality of first air outlet holes 111a and the plurality of second air outlet holes 111b may be disposed in a toothed shape.

In an embodiment of the present application, referring to fig. 2, 5, 8 and 15, the opening area of the first air outlet hole 111a is larger than the opening area of the second air outlet hole 111b, and the edges of the two sides of the first air outlet hole 111a in the width direction of the fire grate body 100 are arranged in a tooth shape.

In this embodiment, by setting the edges of the two sides of the first air outlet holes 111a with a larger opening area in the width direction of the fire grate body 100 to be tooth-shaped, the contact area between the fuel gas and the secondary air can be further increased, so that the combustion is more sufficient.

Further, the first air outlet hole 111a includes two first sub air outlet holes 1111, and the two first sub air outlet holes 1111 are arranged at intervals in the width direction of the fire grate body 100; in the width direction of the fire grate body 100, the outer edges of the two first sub-air outlet holes 1111 are arranged in a tooth shape.

In this embodiment, through setting up first venthole 111a into two first sub ventholes 1111 at fire row body 100 width direction interval, can play the effect of scattering to air and gas mixture further shunts for the flame of first sub venthole 111 department is more easy with the secondary air contact of fire row body 100 both sides, is tooth form setting with the outside edge of two first sub ventholes 1111 simultaneously, further increases the area of contact of gas and secondary air, and the burning is more abundant, promotes flame homogeneity.

As an example, the first sub-air outlet holes 1111 may be substantially square holes, and the second air outlet holes 111b may be substantially bar-shaped holes extending along the width direction of the fire grate body 100, and the two sub-air outlet holes 1111 and the second air outlet holes 111b are alternately distributed along the length direction of the fire grate body 100 at intervals, so as to further improve the flame stabilizing effect, reduce the flame height, make the performance of instantaneous combustion exhaust smoke better, and reduce the nitrogen oxides generated after combustion.

In addition, the two first sub-air outlets 1111 are symmetrically distributed in the width direction of the fire grate body 100, so that the mold design can be simplified and the process efficiency can be improved while the flame is uniform.

In an embodiment of the present application, referring to fig. 1 to 10, a fire grate body 100 includes a top plate 110 and two side plates 120 connected to the top plate 110 and extending to the same side thereof, and an air flow channel 101 is formed between the two side plates 120; the plurality of air outlet holes 111 are formed in the top plate 110, and the metal mesh 200 is disposed inside the top plate 110.

The structure of the fire grate body 100 is illustrated in this embodiment, the fire grate body 100 includes two side plates 120 and a top plate 110, the two side plates 120 may be connected by riveting or welding to form an air flow channel 101 therebetween, the top plate 110 may be integrated with the two side plates 120 or be in a split structure, and a plurality of air outlet holes 111 are formed on the top plate 110, so that air and gas mixture in the air flow channel 101 can flow out from the plurality of air outlet holes 111 on the top plate 110 and be ignited for combustion.

In practice, the air outlet 111 may be stamped from the top plate 110.

It will be appreciated that the metal mesh 200 may be disposed on the upper surface or the lower surface of the top plate 110, and when disposed on the upper surface of the top plate 110, the air flows out from the air outlet holes 111 and then is dispersed through the metal mesh 200 to be burned on the upper surface of the metal mesh 200. When the metal mesh 200 is disposed below the top plate 110, the air flows are dispersed and mixed by the metal mesh 200, and then flow out from the plurality of air outlet holes 111 and burn. In the present embodiment, the metal mesh 200 is disposed inside the top plate 110, that is, below the air outlet hole 111, by way of example, in consideration of the life of the metal mesh 200, the cost, and the like.

In an embodiment of the present application, referring to fig. 1 to 3 and fig. 11 to 15, the flame row further includes a flame stabilizing device 300 sleeved on the upper portion of the flame row body 100, a cavity 301 is formed in the flame stabilizing device 300, a top of the cavity 301 is an opening 302, a gap 303 is formed between a side wall of the cavity 301 and the side plate 120, and a plurality of side air outlets 121 communicating the gap 303 with the air flow channel 101 are formed in the side plate 120.

In this embodiment, by arranging the flame stabilizing device 300 on the upper portion of the flame row body 100, a gap 303 is formed between the cavity 301 of the flame stabilizing device 300 and the side plate 120 of the flame row body 100, and by arranging a plurality of side air outlets 121 on the side plate 120, part of the air in the air flow channel 101 can enter the gap 303 through the side air outlets 121 and flow out from the opening 302 on the top surface, so that the air outlet amount of the flame row structure can be increased, and the combustion flame is more stable.

As an example, referring to fig. 1 to 3 and 11 to 15, the flame stabilizing device 300 includes two flame stabilizing plates 310 disposed outside the two side plates 120, and the two flame stabilizing plates 310 may be welded or riveted to the corresponding side plates 120, and a gap 303 is formed between each flame stabilizing plate 310 and the corresponding side plate 120. It can be appreciated that the two flame stabilizing sheets 310 extend upward and protrude from the top of the flame row body 100, and can play a role of flame guiding and stabilizing, so that the side flame gathers towards the target area of the flame row, which is beneficial to improving the heat gathering effect in the combustion process.

In an embodiment, referring to fig. 1 to 3 and fig. 11 to 15, two flame holders 310 are respectively provided with a plurality of lateral convex hulls 311 arranged at intervals along the length direction of the side plate 120. It can be appreciated that the fire grate structure is formed by connecting a plurality of fire grate bodies 100 side by side, and the upper portion of each fire grate body 100 is provided with a flame stabilizing device 300, and in this embodiment, by arranging a plurality of lateral convex hulls 311 on the flame stabilizing plates 310, the positioning effect of two adjacent fire grate bodies 100 can be achieved or the effect of increasing the secondary air supply can be achieved.

Specifically, the plurality of lateral protrusions 311 includes a plurality of positioning protrusions 3111 facing away from the cavity 301 and/or a plurality of inner protrusions 3112 recessed toward the side plate 120. It can be appreciated that the positioning convex hulls 3111 are protruding towards the outside of the flame stabilizing plates 310, and at this time, the adjacent flame stabilizing plates 310 of the two adjacent flame row bodies 100 are propped against each other and positioned by the plurality of positioning convex hulls 3111, so that gaps between adjacent flame row units are consistent, and supply of secondary air is ensured. The inner convex hull 3112 is formed by the inward concave of the flame stabilizing fin 310 toward the side plate 120, so that the flow area of the secondary air supply between adjacent flame row units can be increased, and the supply amount of the secondary air can be further increased. Alternatively, the inner convex hull 3112 may include a swaged tooth structure, a pull through swage structure, or the like.

Further, referring to fig. 1 to 3 and 11 to 15, the upper edge of the flame stabilizing plate 310 is provided with a plurality of notches 312.

In this embodiment, by providing a plurality of notches 312 on the upper edge of the flame stabilizing plate 310, the generation of vortex can be reduced, and the air flow resistance can be reduced, so that the flame combustion stability is higher. Alternatively, the plurality of notches 312 may be spaced apart along the length of the flame holder 310.

In an embodiment of the present application, referring to fig. 10, the plurality of side air outlets 121 are arranged in a single row and are distributed at intervals along the length direction of the side plate 120, and the flow area of the bottom of the side air outlets 121 is larger than the flow area of the upper portion of the side air outlets 121.

In this embodiment, taking the side air outlets 121 as single-row air outlets as an example, the plurality of side air outlets 121 are distributed in a single row, so that the resistance of the air flowing from bottom to top is smaller as the air flows from bottom to top, and the air outlet resistance can be reduced and the stability of side air outlet can be ensured by setting the flow area of the bottom of the side air outlets 121 to be larger than the flow area of the upper part of the side air outlets 121.

In an embodiment of the present application, referring to fig. 4 to 9, the side plate 120 is provided with at least two rows of side air outlets 121 in a height direction, and a plurality of side air outlets 121 in the same row are distributed at intervals along a length direction of the side plate 120, and a plurality of side air outlets 121 in two adjacent rows are distributed in a staggered manner.

In this embodiment, taking two or more rows of the side air outlets 121 as an example, at least two side air outlets 121 are spaced apart in the height direction of the side plate 120, and the plurality of side air outlets 121 in each row are spaced apart along the length direction of the side plate 120, so that the air flow in the air flow channel 101 can enter the gap 303 through the plurality of side air outlets 121, and the air outlet amount is increased. The plurality of side air outlets 121 of adjacent two rows are staggered so that the side air flow can enter the gap 303 more uniformly, thereby making the flame more uniform and stable.

It will be appreciated that the shape and configuration of the plurality of side air outlets 121 may be varied according to the actual situation, such as a circular hole, a bar-shaped hole, a triangular hole, or other shaped holes. The shapes of the plurality of side air outlets 121 of the same row may be the same or different, and the shapes of the plurality of side air outlets 121 of different rows may be the same or different. In order to secure the air output, in the embodiment for the adjacent two rows of the side air outlets 121, the flow area of the plurality of side air outlets 121 of the lower row may be set to be larger than the flow area of the plurality of side air outlets 121 of the upper row, and as an example, the number of side air outlets 121 of the lower row may be larger than the number of side air outlets 121 of the upper row.

The utility model also provides a combustion device, which comprises a fire row, wherein the specific structure of the fire row refers to the embodiment, and as the combustion device adopts all the technical schemes of all the embodiments, the combustion device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

By way of example, the combustion device may be a burner, such as an atmospheric burner, a rich-lean burner, or other forms of water-cooled burner.

The combustion device may be a gas water heater, a boiler, or the like, as an example.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (12)

1. A fire grate, comprising:

the fire grate body is internally provided with an air flow channel, the fire grate body is provided with a plurality of air outlet holes communicated with the air flow channel, the air outlet holes are distributed at intervals along the length direction of the fire grate body, and at least part of the edges of the air outlet holes are arranged in a nonlinear manner; and

the metal net is arranged on the fire grate body at positions corresponding to the air outlet holes.

2. The fire grate of claim 1 wherein at least one of said gas outlet holes is non-linearly disposed on opposite side edges of said grate body in a width direction.

3. The fire grate of claim 2 wherein at least one of said gas outlet holes is provided in a toothed configuration on both widthwise edges of said grate body.

4. The fire grate of claim 3 wherein said plurality of air outlet holes comprises a plurality of first air outlet holes and a plurality of second air outlet holes, said first air outlet holes having a different open area than said second air outlet holes, said plurality of first air outlet holes and said plurality of second air outlet holes being alternately arranged along the length of said fire grate body;

the hole edges of the first air outlet holes and/or the second air outlet holes are arranged in a tooth shape.

5. The fire grate of claim 4 wherein the first air outlet holes have a larger open area than the second air outlet holes, and wherein the first air outlet holes are arranged in a toothed pattern on the two side edges of the fire grate body in the width direction.

6. The fire grate of claim 5 wherein said first air outlet holes comprise two first sub air outlet holes, said two first sub air outlet holes being spaced apart in a width direction of said fire grate body;

and in the width direction of the fire row body, the outer side edges of the two first sub air outlet holes are arranged in a tooth shape.

7. A fire grate as claimed in any one of claims 1 to 6 wherein said grate body includes a top plate and two side plates connected to and extending to the same side as said top plate, said air flow passage being formed between two of said side plates;

the plurality of air outlet holes are formed in the top plate, and the metal net is arranged on the inner side of the top plate.

8. The fire grate of claim 7 further comprising a flame stabilizing device sleeved on the upper portion of the fire grate body, wherein a cavity is formed in the flame stabilizing device, the top of the cavity is open, a gap is formed between the side wall of the cavity and the side plate, and a plurality of side air outlets communicating the gap with the air flow channel are formed in the side plate.

9. The fire grate of claim 8 wherein a plurality of said side air outlets are spaced apart in a single row along the length of said side panels, the flow area at the bottom of said side air outlets being greater than the flow area at the upper portion of said side air outlets;

or, the side plate is provided with at least two rows of side air outlets in the height direction, a plurality of side air outlets in the same row are distributed at intervals along the length direction of the side plate, and a plurality of side air outlets in two adjacent rows are distributed in a staggered manner.

10. The fire grate of claim 8 wherein said flame stabilizing means comprises two flame stabilizing fins spaced outwardly of said side panels, said two flame stabilizing fins each having a plurality of lateral projections spaced along the length of said side panels.

11. A fire grate as claimed in claim 10 wherein a plurality of said lateral projections include a plurality of locating projections facing away from said cavity and/or a plurality of inner projections recessed toward said side panels;

and/or the upper edge of the flame stabilizing sheet is provided with a plurality of notches.

12. A combustion apparatus comprising a fire grate as claimed in any one of claims 1 to 11.