CN221403040U - Fire grate and combustion device - Google Patents

Abstract

The utility model discloses a fire grate and combustion equipment, wherein the fire grate comprises: the fire grate body is internally provided with an airflow channel; the combustion head comprises a fire dividing plate arranged at an air outlet of the air flow channel, the fire dividing plate is provided with a plurality of combustion fire ports communicated with the air flow channel, a flanging is arranged at the position, corresponding to at least part of the combustion fire ports, of the side edge of the fire dividing plate, and a gap is formed between at least part of the flanging and the corresponding side edge of the combustion fire port; and the metal net is arranged on the combustion head part and is opposite to the plurality of combustion fire ports, and part of side edges of the metal net are positioned on the bottom side of the flanging. The technical scheme of the utility model can improve combustion stability, reduce combustion noise, reduce emission of nitrogen oxides and realize low-nitrogen combustion.

Description

Fire bars and combustion equipment

Technical Field

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

Background technique

In the related technologies, in order to reduce the nitrogen oxide content in the exhaust gas of gas water heaters, full premixed combustion technology, rich-lean combustion technology and water-cooled combustion technology are often used. However, due to the high cost and production technology requirements of these technologies, the selling price is also high, and the market acceptance is low, which is not conducive to the widespread application of the products. In addition to the above-mentioned related low-nitrogen technologies, low-nitrogen burners with fire holes made of metal mesh are currently also used in products. The fire row of this type of burner uses metal mesh to make fire holes, but because the combustion area of the metal mesh fire holes increases, when the fan wind speed fluctuates, it is often easy to cause flame separation and fire failure, resulting in unstable combustion, poor smoke emissions, combustion resonance, high noise and other problems.

Utility Model Content

The main purpose of the utility model is to provide a fire grate, which is intended to improve combustion stability, reduce combustion noise, reduce nitrogen oxide emissions, and achieve low-nitrogen combustion.

In order to achieve the above-mentioned purpose, the fire grate proposed by the utility model comprises:

The fire bar body has an air flow channel formed inside;

The combustion head comprises a fire dividing plate arranged at the air outlet of the air flow channel, the fire dividing plate is provided with a plurality of combustion burners connected with the air flow channel, the side edge of the fire dividing plate is provided with flanges at positions corresponding to at least part of the combustion burners, and a gap is formed between at least part of the flanges and the corresponding side edges of the combustion burners; and

A metal mesh is arranged on the combustion head and is arranged opposite to the plurality of combustion burners, and a part of the side edge of the metal mesh is located on the bottom side of the flange.

In one embodiment, a plurality of the combustion ports are arranged at intervals along the length direction of the fire dividing plate, and the two opposite side edges of the fire dividing plate along the width direction are provided with flanges corresponding to the position of each of the combustion ports, and a gap is formed between each flange and the corresponding side edge of the combustion port.

In one embodiment, the plurality of combustion ports include a first combustion port and a second combustion port, and the flame dividing plate is provided with flanges at two opposite side edges along the width direction thereof corresponding to the position of each of the first combustion ports, and a notch is formed between each flange and the side edge of the corresponding first combustion port;

The first combustion ports and the second combustion ports are arranged alternately and at intervals along the length direction of the fire dividing plate; or, at least two of the first combustion ports are arranged between any two adjacent second combustion ports.

In one embodiment, in the length direction of the fire dividing plate, the fire dividing plate has a middle area and two end areas respectively located at both ends of the middle area, and the opening area of a single combustion port located in the end area is smaller than the opening area of a single combustion port located in the middle area.

In one embodiment, the fire dividing plate includes a plurality of longitudinal ribs arranged at intervals along its length direction, each of the longitudinal ribs extends along the width direction of the fire dividing plate, and the combustion port is formed between any two adjacent longitudinal ribs. The arrangement density of the longitudinal ribs located in the end area is greater than the arrangement density of the longitudinal ribs located in the middle area.

In one embodiment, the plurality of combustion ports located in the middle area of the fire dividing plate are arranged to form at least one row of ports, and each row of ports includes third combustion ports and fourth combustion ports alternately arranged along the length direction of the fire dividing plate, and the opening area of the third combustion port is greater than the opening area of the fourth combustion port.

In one embodiment, at least two rows of the burner rows are arranged in the middle area of the fire dividing plate, and the at least two rows of the burner rows include a first burner row and a second burner row adjacent to each other in the width direction of the fire dividing plate, and the first burner row and the second burner row both include third combustion burners and fourth combustion burners alternately arranged along the length direction of the fire dividing plate, and the third combustion burner in the first burner row is arranged opposite to the fourth combustion burner in the second burner row.

In one embodiment, the fire dividing plate includes a plurality of transverse ribs arranged along the length direction thereof, each of the transverse ribs extends along the length direction of the fire dividing plate, any two adjacent transverse ribs are staggered in the width direction of the fire dividing plate, and the third combustion port and the fourth combustion port adjacent to each other in the width direction of the fire dividing plate are separated by the transverse ribs.

In one of the embodiments, at least part of the side edges of the combustion port are provided with protrusions and/or grooves.

In one embodiment, the combustion head also includes two side panels respectively arranged on both sides of the fire dividing plate in the width direction, and the two side panels are bent and extended relative to the fire dividing plate toward the airflow channel, and a main air outlet channel is formed between the two adjacent side panels, and the main air outlet channel connects the airflow channel with the multiple combustion flames. A side air outlet channel connected to the airflow channel is formed between the side of each side panel facing away from the other side panel and the fire bar body, and the side air outlet channel facing away from the airflow channel is open to form a flame stabilizing port.

In one embodiment, a first diversion opening is formed between a side of each side plate facing away from the fire distribution plate and the fire bar body, and the first diversion opening connects the air flow channel with the side air outlet channel;

And/or, each of the side plates is provided with a second diversion port, and the second diversion port connects the main air outlet channel with the side air outlet channel.

In one of the embodiments, a plurality of lateral bulges are provided at intervals along the length direction of the fire bar body at a portion opposite to each of the side panels, and the air flow channel is formed between each of the lateral bulges and the adjacent side panel; the plurality of lateral bulges opposite to the same side panel include two end lateral bulges respectively located at both ends, and a middle lateral bulge located between the two end lateral bulges; the first diversion port is formed between the side of each side panel away from the fire dividing plate and each of the middle lateral bulges; the second diversion port is provided at a portion of each side panel opposite to the end lateral bulge and the middle lateral bulge.

The utility model also provides a combustion device, comprising the fire grate as described above.

The technical solution of the utility model cooperates with the fire-dividing plate and the metal mesh, and utilizes the fine mesh of the metal mesh to disperse the combustion burner on the fire-dividing plate into a number of fine fire holes. On the one hand, compared with the strip fire holes of the traditional fire grate, the burner area of the fire grate can be increased; on the other hand, the fire holes can be dispersed to avoid the problem of local high temperature of the strip fire holes, so that the temperature of the combustion surface of the fire grate is more uniform, the heat intensity of the fire holes is reduced, there is no local high temperature, and the generation of nitrogen oxides (NOx) is effectively inhibited, thereby achieving low-nitrogen combustion. In addition, the metal mesh can also prevent safety accidents such as explosions caused by flashback. And the side edge of the fire-dividing plate is provided with a flange at a position corresponding to at least part of the combustion burner, and a gap is formed between at least part of the flange and the side edge of the corresponding combustion burner; part of the side edge of the metal mesh is located at the bottom side of the flange. By leaving a gap between the flange and the side edge of the combustion burner, the circumference of the contact contour between the flame and the fire-dividing plate is increased, so that the flame combustion is more stable and the combustion noise is reduced. The flanged part of the side edge of the fire-dividing plate can just cover the uneven part of the side edge of the metal mesh, making the combustion area of each fire row more consistent and stable. In addition, the flanged design with a notch can also reduce the impact of the flange on the combustion area, ensuring sufficient combustion area, and avoiding the through flange causing too much reduction in the combustion area, which leads to an increase in CO and NOx in the flue gas. In this way, through the comprehensive effect of multiple aspects, it can improve combustion stability, reduce combustion noise, reduce nitrogen oxide emissions, and achieve low-nitrogen combustion.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

FIG1 is a schematic structural diagram of an embodiment of a fire grate of the utility model;

FIG2 is a front view of the fire grate in FIG1 ;

FIG3 is a schematic diagram of the exploded structure of the fire bar in FIG1 ;

FIG4 is a schematic cross-sectional view of the fire bar in FIG1 ;

FIG5 is a partial enlarged schematic diagram of point A in FIG4 ;

FIG6 is a schematic diagram of the assembly structure of the combustion head and the metal mesh;

FIG7 is a top view of an embodiment of a combustion head;

FIG8 is a partial enlarged view of point B in FIG7;

FIG9 is a top view of another embodiment of a combustion head;

FIG. 10 is a side view of an embodiment of a burner head.

Description of Figure Numbers:

The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

Detailed ways

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and/or" or "and/or" appears in the full text, its meaning includes three parallel solutions. Taking "A and/or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

The utility model proposes a fire grate 100, which aims to improve the combustion stability of the fire grate 100 and a combustion device having the fire grate 100, reduce combustion noise, reduce nitrogen oxide emissions, and achieve low-nitrogen combustion by optimizing the structure of the fire grate 100.

Please refer to Figures 1 to 4. In one embodiment of the utility model, the fire grate 100 includes a fire grate body 10, a combustion head 20 and a metal mesh 30. An airflow channel 101 is formed inside the fire grate body 10; the combustion head 20 includes a fire dividing plate 21 arranged at the air outlet 103 of the airflow channel 101, the fire dividing plate 21 is provided with a plurality of combustion ports 211 connected to the airflow channel 101, and the side edge of the fire dividing plate 21 is provided with a flange 212 at a position corresponding to at least part of the combustion ports 211, and a gap 213 is formed between at least part of the flange 212 and the corresponding side edge of the combustion port 211; the metal mesh 30 is arranged at the combustion head 20 and arranged opposite to the plurality of combustion ports 211, and part of the side edge of the metal mesh 30 is located at the bottom side of the flange 212.

Please refer to Figures 3 and 4. The fire bar body 10 is the main structure of the fire bar 100. An airflow channel 101 is formed inside the fire bar body 10. The airflow channel 101 has an air inlet 102 arranged on the side of the fire bar body 10, and an air outlet 103 arranged on the top of the fire bar body 10. The fire bar body 10 may specifically include two half shells assembled with each other, and the two half shells enclose the airflow channel 101. The airflow channel 101 may specifically include an ejection channel connected to the air inlet 102, a diversion channel connected to the air outlet 103, and a curved channel connecting the ejection channel and the diversion channel. Among them, the half shells can be stamped out with a corresponding cavity channel using sheet metal parts, and then the two half shells can be welded and fixed to each other. The combustion head 20 is generally a sheet metal part arranged on the top of the fire bar body 10. The combustion head 20 includes a fire dividing plate 21 arranged opposite to the air outlet 103 of the air flow channel 101. The fire dividing plate 21 is provided with a plurality of combustion ports 211. The metal mesh 30 is arranged opposite to the plurality of combustion ports 211. The shape of the combustion port 211 includes but is not limited to a square, a circle, a trapezoid or other special-shaped structures. Specifically, the fire dividing plate 21 may include a plurality of longitudinal ribs 214 and transverse ribs 215 arranged at intervals along its length direction. The longitudinal ribs 214 and the transverse ribs 215 are cross-arranged to form the combustion port 211. The external gas source (such as gas and air) enters the air flow channel 101 through the air inlet 102 of the fire bar body 10, and is fully mixed inside the air flow channel 101 to form a mixed gas. The mixed gas then flows from the air outlet 103 to the metal mesh 30 and the fire dividing plate 21, and is ignited at the combustion port 211 of the fire dividing plate 21 to form a combustion flame.

Nitrogen oxides (NOx) in gas water heaters are mainly generated due to high combustion temperatures. Traditional fire grates usually use a single-strip fire hole structure. This single-strip fire hole structure has a small fire hole area, high burning fire hole intensity, and poor flue gas performance emitted by instantaneous combustion, resulting in high nitrogen oxides and failing to meet low nitrogen emission performance requirements. In this embodiment, a fire distribution plate 21 having a combustion burner 211 is matched with a metal mesh 30 having a plurality of fine meshes. The fine meshes of the metal mesh 30 can disperse the combustion burner 211 with a large opening area into a plurality of fine fire holes. On the one hand, compared with the strip fire holes of the traditional fire grate 100, the burner area of the fire grate 100 can be increased; on the other hand, the fire holes can be dispersed to avoid the problem of local high temperature of the strip fire holes, so that the temperature of the combustion surface of the fire grate 100 is more uniform, the heat intensity of the fire holes is reduced, there is no local high temperature, and the generation of nitrogen oxides (NOx) is effectively suppressed, thereby achieving low nitrogen combustion. In addition, the metal mesh 30 can also prevent safety accidents such as explosions caused by flashback.

It is understandable that the metal mesh 30 can be located above or below the fire-dividing plate 21. In practical applications, since the flame burns above the fire-dividing plate 21, the requirements for heat resistance and strength of the metal mesh 30 located above the fire-dividing plate 21 will be higher than the requirements for heat resistance and strength of the metal mesh 30 located below the fire-dividing plate 21. Considering factors such as cost, the metal mesh 30 can be located below the fire-dividing plate 21. Among them, the metal mesh 30 and the fire-dividing plate 21 are assembled and fixed, including but not limited to welding, riveting, etc. The number of layers of the metal mesh 30 can be single-layer or multi-layer. The mesh number of the metal mesh 30 can be set according to actual needs. For example, the mesh number range of the metal mesh 30 can be selected between 20 mesh and 40 mesh, specifically 20 mesh, 30 mesh, 40 mesh, etc. Exemplarily, the mesh number of the metal mesh 30 can be 30 mesh.

It should be noted that the side edge of the fire-dividing plate 21 is provided with a flange 212 at a position corresponding to at least part of the burning ports 211. That is, the side edge of the fire-dividing plate 21 is provided with a flange 212 at a position corresponding to at least one of the burning ports 211. For example, the side edge of the fire-dividing plate 21 is provided with a flange 212 at a position corresponding to each of the burning ports 211. Alternatively, the side edge of the fire-dividing plate 21 is provided with a flange 212 at a position corresponding to a part of the burning ports 211, and the position corresponding to the other part of the burning ports 211 is not provided with a flange 212. In addition, the fire-dividing plate 21 may be provided with a flange 212 on one side in the width direction, or the fire-dividing plate 21 is provided with a flange 212 on both sides in the width direction. A notch 213 is formed between at least part of the flange 212 and the side edge of the corresponding burning port 211. That is, a notch 213 is formed between at least one flange 212 of the side edge of the fire-dividing plate 21 and the side edge of the corresponding burning port 211. For example, when flanges 212 are provided at positions corresponding to the side edges of the fire-dividing plate 21 and the plurality of combustion ports 211, a notch 213 may be formed between each flange 212 and the side edge of the corresponding combustion port 211, or a notch 213 may be formed between part of the flanges 212 and the side edge of the corresponding combustion port 211, while another part of the flanges 212 and the side edge of the corresponding combustion port 211 are connected as a whole without forming a notch 213. In addition, a notch 213 may be formed between the flange 212 and one of the side edges of the corresponding combustion port 211, or a notch 213 may be formed between the flange 212 and the opposite side edges of the corresponding combustion port 211.

Exemplarily, as shown in FIG7 , the side edge of the fire-dividing plate 21 is provided with a flange 212 corresponding to the position of one of the burning ports 211, and the flange 212 is located in the area enclosed by the burning port 211. In the length direction of the fire-dividing plate 21, the size of the flange 212 is smaller than the size between the two opposite side edges of the burning port 211, so that a gap 213 is formed between the two ends of the flange 212 and the two side edges of the burning port 211. Of course, one end of the flange 212 can also be extended to connect with one side edge of the burning port 211, and a gap 213 is formed between the other end of the flange 212 and the other side edge of the burning port 211. In practical application, the burning port 211 with the flange 212 can be directly stamped out on the fire-dividing plate 21 of sheet metal material by a stamping process, and a certain gap 213 is left between the flange 212 and the side edge of the burning port 211, which is simple and convenient to manufacture.

The fire grate 100 of the technical solution of the utility model comprises a fire grate body 10, a combustion head 20 and a metal mesh 30. An airflow channel 101 is formed inside the fire grate body 10; the combustion head 20 comprises a fire distribution plate 21 arranged at the air outlet 103 of the airflow channel 101, the fire distribution plate 21 is provided with a plurality of combustion ports 211 connected to the airflow channel 101, and the metal mesh 30 is arranged at the combustion head 20 and covers the plurality of combustion ports 211. The fine mesh of the metal mesh 30 can disperse the combustion ports 211 with a large opening area into a plurality of fine fire holes. On the one hand, compared with the strip fire holes of the traditional fire grate 100, the burner area of the fire grate 100 can be increased; on the other hand, the fire holes can be dispersed to avoid the problem of local high temperature of the strip fire holes, so that the temperature of the combustion surface of the fire grate 100 is more uniform, the heat intensity of the fire holes is reduced, there is no local high temperature, and the generation of nitrogen oxides (NOx) is effectively suppressed, thereby achieving low-nitrogen combustion. In addition, the metal mesh 30 can also prevent safety accidents such as explosions caused by flashback. A flange 212 is provided at a position corresponding to at least a portion of the combustion port 211 on the side edge of the fire-spreading plate 21, and a gap 213 is formed between at least a portion of the flange 212 and the corresponding side edge of the combustion port 211; a portion of the side edge of the metal mesh 30 is located at the bottom side of the flange 212. By leaving the gap 213 between the flange 212 and the side edge of the combustion port 211, the circumference of the contact profile between the flame and the fire-spreading plate 21 is increased, so that the flame burns more stably and the combustion noise is reduced. In addition, the side edge of the metal mesh 30 is usually uneven. When the metal mesh 30 is provided with multiple layers, the uneven side edge phenomenon is more obvious. If there is no flange 212, after the combustion head 20 and the metal mesh 30 are assembled, the side edge will have some large gaps and some small gaps, and the consistency is poor. Through the above-mentioned flange 212 design, part of the side edge of the metal mesh 30 is located at the bottom side of the flange 212, that is, the side edge of the fire-distributing plate 21 is provided with the flange 212. The part of the uneven side edge of the metal mesh 30 can just cover the uneven part of the side edge of the metal mesh 30, so that the consistency of the combustion area of each fire row 100 is more stable. In addition, the flange 212 design with a notch 213 can also reduce the impact of the flange 212 on the combustion area, ensure sufficient combustion area, and avoid the flange 212 that penetrates too much to reduce the combustion area and cause the CO and NOx in the flue gas to increase. In this way, through the comprehensive effect of many aspects, it is possible to improve the combustion stability, reduce the combustion noise, reduce the emission of nitrogen oxides, and achieve low-nitrogen combustion.

As shown in Figure 7, in one embodiment, a plurality of the combustion ports 211 are arranged at intervals along the length direction of the fire dividing plate 21, and the fire dividing plate 21 is provided with the flange 212 at the position corresponding to each of the combustion ports 211 on two opposite side edges along the width direction thereof, and a notch 213 is formed between each of the flanges 212 and the side edge of the corresponding combustion port 211.

In this embodiment, a plurality of combustion ports 211 are arranged at intervals along the length direction of the fire dividing plate 21, which can play the role of diverting gas, so that air and gas are fully mixed and burned. Among them, the plurality of combustion ports 211 can be arranged in a single row, a double row or a plurality of rows of ports, and each row of ports includes a plurality of combustion ports 211 arranged at intervals along the length direction of the fire dividing plate 21. The fire dividing plate 21 is provided with flanges 212 at the positions of each of the combustion ports 211 at two opposite side edges along its width direction, and a notch 213 is formed between each flange 212 and the side edge of the corresponding combustion port 211, so that the inner edge profile of each combustion port 211 can be lengthened, so that the circumference of the contact profile between the flame and the fire dividing plate 21 can be increased to the maximum extent, further improving the combustion stability and reducing the combustion noise. In addition, a notch 213 is left between each flange 212 and the side edge of the corresponding combustion port 211, which can also minimize the influence of the flange 212 on the combustion area and ensure sufficient combustion area. In addition, in the length direction of the fire dividing plate 21 , the uneven positions on both side edges of the metal mesh 30 are covered by multiple flanges 212 as much as possible, thereby further improving the consistency of the combustion area of the fire grate 100 .

As shown in Figure 9, in another embodiment, the plurality of combustion ports 211 include a first combustion port 211a and a second combustion port 211b, and the two opposite side edges of the fire dividing plate 21 along the width direction thereof are provided with the flange 212 corresponding to the position of each of the first combustion ports 211a, and a notch 213 is formed between each of the flanges 212 and the corresponding side edge of the first combustion port 211a; the first combustion ports 211a and the second combustion ports 211b are arranged alternately and at intervals along the length direction of the fire dividing plate 21; or, at least two of the first combustion ports 211a are arranged between any two adjacent second combustion ports 211b.

In this embodiment, the fire-dividing plate 21 is provided with a first combustion port 211a and a second combustion port 211b, wherein a flange 212 is provided at a position corresponding to the first combustion port 211a on the side edge of the fire-dividing plate 21, and a flange 212 may or may not be provided at a position corresponding to the second combustion port 211b. The shapes of the first combustion port 211a and the second combustion port 211b may be the same or different. For example, the first combustion port 211a may be provided in a square shape, and the second combustion port 211b may be provided in a strip shape extending along the width direction of the fire-dividing plate 21. In addition, the areas of the first combustion port 211a and the second combustion port 211b may be the same or different. For example, when the area of the first combustion port 211a is larger than the area of the second combustion port 211b, a flange 212 is provided at the position corresponding to the side edge of the fire-dividing plate 21 and the first combustion port 211a. In order to avoid excessive shielding of the second combustion port 211b by the flange 212, the position corresponding to the second combustion port 211b may not be provided with the flange 212. In this way, the inner edge contour of the first combustion port 211a can be lengthened, thereby increasing the circumference of the contact contour between the flame and the fire-dividing plate 21, further improving the combustion stability and reducing the combustion noise. No flange 212 is provided at the second combustion port 211b, so that the flange 212 can avoid excessive shielding of the second combustion port 211b by the flange 212, which is conducive to ensuring the overall combustion area of the fire row 100. For another example, when the areas of the first combustion port 211a and the second combustion port 211b are the same, a flange 212 is provided at a position corresponding to the first combustion port 211a, while no flange 212 is provided at a position corresponding to the second combustion port 211b. In this way, a portion of the combustion area of the first combustion port 211a can be blocked, so that the actual combustion area of the first combustion port 211a is smaller than the actual combustion area of the second combustion port 211b, thereby forming a combustion port 211 with two different combustion areas on the fire dividing plate 21, which is conducive to achieving the coordination of large and small flames to form a flame stabilization effect.

In actual application, the first combustion burner 211a and the second combustion burner 211b may be arranged in various ways. For example, the first combustion burner 211a and the second combustion burner 211b are arranged alternately and at intervals along the length direction of the fire-dividing plate 21. The side edge of the fire-dividing plate 21 is provided with a flange 212 at a position corresponding to the first combustion burner 211a, and no flange 212 is provided at a position corresponding to the second combustion burner 211b. In this way, when the combustion areas of the first combustion flame port 211a and the second combustion flame port 211b are different, for example, the combustion area of the first combustion flame port 211a is larger than the combustion area of the second combustion flame port 211b, a plurality of combustion units alternately arranged one large and one small can be formed in the length direction of the fire dividing plate 21, and the flame on the fire dividing plate 21 can be divided into a large and a small flame. Due to the different sizes of the flames, the boundary conditions of the wind speed when the flame is out of flame are also different. When a flame tends to be away from the flame, the surrounding flames can be pulled in to form a stable flame, so that the fire row 100 has a wider range of adaptability to the fan wind speed.

For another example, at least two first combustion ports 211a may be arranged between any two adjacent second combustion ports 211b. Among them, the side edge of the fire-dividing plate 21 is provided with a flange 212 at the position corresponding to the first combustion port 211a, and the position corresponding to the second combustion port 211b is not provided with a flange 212. With such a configuration, the fire-dividing plate 21 can also be divided into combustion units with different areas, thereby improving combustion stability. Exemplarily, as shown in FIG9, four first combustion ports 211a are arranged between any two adjacent second combustion ports 211b, and the four first combustion ports 211a are arranged in an array into two rows and two columns, and each first combustion port 211a is provided with a flange 212 at a position close to the side edge of the fire-dividing plate 21, and a gap 213 is left between each flange 212 and the side edge of the corresponding first combustion port 211a.

It is understandable that the airflow at both ends of the fire bar 100 collides with the boundary wall and flows upward rapidly, that is, the gas flow rate in the two end areas 21b of the fire dividing plate 21 is faster than the gas flow rate in the middle area 21a. The problem of flameout is easy to occur in the two end areas 21b, which is not conducive to combustion stability.

In order to solve the above problem, as shown in FIG6 , in one embodiment, in the length direction of the fire-dividing plate 21, the fire-dividing plate 21 has a middle area 21a and two end areas 21b respectively located at both ends of the middle area 21a, and the opening area of the single combustion burner 211 located in the end area 21b is smaller than the opening area of the single combustion burner 211 located in the middle area 21a. In this way, the opening area of the single combustion burner 211 located in the end area 21b is relatively small, which is conducive to increasing the airflow resistance of the end area 21b, thereby balancing the gas flow and flow rate of the entire fire-dividing plate 21, avoiding the occurrence of flameout and flame separation due to excessive gas flow rate in the two end areas 21b, and further achieving the effect of stabilizing combustion.

Furthermore, as shown in Figure 6, in one embodiment, the fire dividing plate 21 includes a plurality of longitudinal ribs 214 arranged at intervals along its length direction, each of the longitudinal ribs 214 extends along the width direction of the fire dividing plate 21, and the combustion port 211 is formed between any two adjacent longitudinal ribs 214, and the arrangement density of the longitudinal ribs 214 located in the end area 21b is greater than the arrangement density of the longitudinal ribs 214 located in the middle area 21a.

In this embodiment, a plurality of longitudinal ribs 214 arranged at intervals cooperate with each other to form a plurality of combustion ports 211, so that the structure of the combustion ports 211 is simpler and easier to manufacture. The arrangement density of the longitudinal ribs 214 located in the end area 21b is greater than the arrangement density of the longitudinal ribs 214 located in the middle area 21a, that is, within a unit area, the number of longitudinal ribs 214 arranged in the end area 21b is greater, so that the opening area of a single combustion port 211 located in the end area 21b is smaller than the opening area of a single combustion port 211 located in the middle area 21a, so that the end area 21b can increase the airflow resistance through more longitudinal ribs 214, thereby balancing the gas flow and flow rate of the entire fire-dividing plate 21, avoiding the occurrence of flameout and flame separation due to excessive gas flow rate in the two end areas 21b, and further achieving the effect of stabilizing combustion.

As shown in Figures 6 and 7, in one embodiment, the plurality of combustion ports 211 located in the middle area 21a of the fire dividing plate 21 are arranged to form at least one row of ports, and each row of ports includes third combustion ports 211c and fourth combustion ports 211d alternately arranged along the length direction of the fire dividing plate 21, and the opening area of the third combustion port 211c is larger than the opening area of the fourth combustion port 211d.

In this embodiment, the plurality of combustion ports 211 located in the middle area 21a of the fire dividing plate 21 can be arranged to form a single row, double row or multiple rows of ports. Taking the single row of ports as an example, the port row includes a plurality of third combustion ports 211c and fourth combustion ports 211d arranged alternately along the length direction of the fire dividing plate 21, and the opening area of the third combustion port 211c is larger than the opening area of the fourth combustion port 211d. In this way, a plurality of combustion units arranged alternately in a large and a small manner can be formed in the length direction of the fire dividing plate 21, and the flame on the fire dividing plate 21 can be divided into a large and a small flame. Due to the different sizes of the flames, the boundary conditions of the wind speed when the flame is out of the flame are also different. When a flame has a tendency to leave the flame, the surrounding flames can be pulled to form a stable flame, so that the fire row 100 has a wider range of adaptability to the wind speed of the fan.

As shown in Figure 7, in one embodiment, at least two rows of the burner rows are provided in the middle area 21a of the fire dividing plate 21, and the at least two rows of the burner rows include a first burner row and a second burner row adjacent to each other in the width direction of the fire dividing plate 21, and the first burner row and the second burner row both include third combustion burners 211c and fourth combustion burners 211d alternately arranged along the length direction of the fire dividing plate 21, and the third combustion burner 211c in the first burner row is arranged opposite to the fourth combustion burner 211d in the second burner row.

In this embodiment, taking two rows of burner ports as an example, namely the first burner port row and the second burner port row, the first burner port row can be arranged in the length direction of the fire dividing plate 21 according to the rule of the third combustion burner port 211c, the fourth combustion burner port 211d, the third combustion burner port 211c, the fourth combustion burner port 211d..., and the second burner port row can be arranged in the length direction of the fire dividing plate 21 according to the rule of the fourth combustion burner port 211d, the third combustion burner port 211c, the fourth combustion burner port 211d, the third combustion burner port 211c..., so that in the width direction of the fire dividing plate 21, the third combustion burner port 211c in the first burner port row and the fourth combustion burner port 211d in the second burner port row are arranged opposite to each other. In this way, not only can a number of large and small combustion units arranged alternately be formed in the length direction of the fire dividing plate 21, but also a number of large and small combustion units arranged alternately can be formed in the width direction of the fire dividing plate 21. The flame on the fire dividing plate 21 can be divided into a large and a small flame along its length and width directions, thereby forming a better flame stabilizing effect, further improving combustion stability and reducing combustion noise.

As shown in Figure 7, in one embodiment, the fire dividing plate 21 includes a plurality of transverse ribs 215 arranged along the length direction thereof, each of the transverse ribs 215 extends along the length direction of the fire dividing plate 21, and any two adjacent transverse ribs 215 are staggered in the width direction of the fire dividing plate 21, and the third combustion port 211c and the fourth combustion port 211d adjacent to each other in the width direction of the fire dividing plate 21 are separated by the transverse ribs 215.

In this embodiment, any two adjacent transverse ribs 215 of the plurality of transverse ribs 215 of the fire-dividing plate 21 are arranged in a staggered manner, that is, the center lines of any two adjacent transverse ribs 215 are not on the same straight line. In this way, the third combustion port 211c and the fourth combustion port 211d arranged adjacently in the width direction of the fire-dividing plate 21 can be separated by the transverse ribs 215, and at the same time, the third combustion port 211c and the fourth combustion port 211d in the same row of ports can also be arranged in a staggered manner by the staggered transverse ribs 215. Thus, a plurality of combustion units arranged in a staggered interval of one large and one small can be formed on the fire-dividing plate 21. In this way, the flame on the fire-dividing plate 21 can be divided into a large and a small flame, and the large and small flames are staggered and separated. When a flame has a tendency to leave the flame, the surrounding flames can be pulled, which can form a better flame stabilization effect, which is conducive to further widening the adaptability range of the fire row 100 to the wind speed of the fan.

Of course, in other embodiments, the center lines of the multiple transverse ribs 215 on the fire-dividing plate 21 can also be set to be on the same straight line. In this case, it is only necessary to design the shape of the combustion port 211 on the fire-dividing plate 21, and the flame on the fire-dividing plate 21 can be divided into a large and a small flame to form a stable combustion. For example, as shown in Figure 9, in one embodiment, the multiple combustion ports 211 on the fire-dividing plate 21 include a first combustion unit and a second combustion unit alternately arranged along the length direction of the fire-dividing plate 21, wherein the first combustion unit includes four first combustion ports 211a arranged in an array, and the four first combustion ports 211a are separated from each other by cross-arranged transverse ribs 215 and longitudinal ribs 214, and the second combustion unit includes a single second combustion port 211b. At this time, the center lines of the multiple transverse ribs 215 are on the same straight line. Among them, the combustion area of the first combustion unit is larger than the combustion area of the second combustion unit.

As shown in Fig. 7 and Fig. 9, in some embodiments, at least part of the side edge of the combustion burner 211 is provided with a convex portion 216 and/or a groove. By providing the convex portion 216 and/or the groove on the side edge of the combustion burner 211, on the one hand, the contact surface between the flame and the surrounding air can be increased to make the combustion more complete, and on the other hand, the inner edge contour of the combustion burner 211 can be further extended, thereby increasing the circumference of the contact contour between the flame and the fire-distributing plate 21, making the flame more stable.

Usually, two adjacent combustion ports 211 are separated by transverse ribs 215 or longitudinal ribs 214, that is, the transverse ribs 215 or longitudinal ribs 214 constitute part of the side edge of the combustion port 211. Considering that the width of the transverse ribs 215 and longitudinal ribs 214 is usually narrow, in order to avoid the significant impact on the structural strength caused by the opening of the groove, a convex portion 216 can be optionally provided on the edge of the transverse ribs 215 and/or longitudinal ribs 214, so that the inner edge contour of the combustion port 211 can be extended while ensuring the structural strength. In addition, when part of the combustion port 211 is provided with a flange 212, the flange 212 can also be regarded as part of the side edge of the combustion port 211, and a convex portion 216 can also be provided on the flange 212. The shape of the convex portion 216 can be designed as a hemispherical shape, a tooth shape or other shapes as needed.

Exemplarily, as shown in FIG7, in one embodiment, the fire-spreading plate 21 is provided with a third combustion port 211c and a fourth combustion port 211d arranged alternately along the length direction, wherein the opposite side edges of each third combustion port 211c are provided with convex portions 216 correspondingly. Exemplarily, as shown in FIG9, in another embodiment, the fire-spreading plate 21 is provided with a first combustion port 211a and a second combustion port 211b, the second combustion port 211b is extended along the width direction of the fire-spreading plate 21, and the two long sides of the second combustion port 211b are respectively provided with two convex portions 216. Of course, the arrangement form of the convex portions 216 is not limited thereto, and the side edges of each combustion port 211 may be provided with convex portions 216. In addition, the number of convex portions 216 in a single combustion port 211 may be one, two or more. When the convex portions 216 in a single combustion port 211 are set to an even number, the even number of convex portions 216 may be arranged symmetrically or asymmetrically.

On the basis of any of the above embodiments, please refer to Figures 3 to 5. In one embodiment, the combustion head 20 also includes two side panels 22 respectively arranged on both sides of the width direction of the fire dividing plate 21, and the two side panels 22 are bent and extended relative to the fire dividing plate 21 toward the air flow channel 101, and a main air outlet channel 201 is formed between two adjacent side panels 22. The main air outlet channel 201 connects the air flow channel 101 with the plurality of combustion flames 211, and a side air outlet channel 202 connected to the air flow channel 101 is formed between the side of each side panel 22 facing away from the other side panel 22 and the fire bar body 10, and the side air outlet channel 202 facing away from the air flow channel 101 is open to form a flame stabilizing port.

In this embodiment, the two side panels 22 and the fire dividing plate 21 can be integrally bent and formed by a sheet metal plate, or can also be connected and fixed by welding, riveting, etc. In order to simplify the manufacturing process, optionally, the combustion head 20 is a sheet metal part, and the fire dividing plate 21 and two side panels 22 are integrally bent and formed, and then the corresponding combustion fire port 211 is punched out on the fire dividing plate 21. During assembly, the combustion head 20 is placed in the air outlet 103 of the fire bar body 10, and then the two side panels 22 are respectively welded and fixed to the two half shells of the fire bar body 10. Through the cooperation between the combustion head 20 and the fire bar body 10, the part of the air outlet 103 of the fire bar body 10 can be divided into a main air outlet channel 201 and a side air outlet channel 202 located on both sides of the main air outlet channel 201. In this way, the gas and air are fully mixed in the air flow channel 101 of the fire grate body 10 to form a mixed gas, and the mixed gas is transported to the position of the combustion head 20 for diversion. A part of the mixed gas is transported to the combustion port 211 of the fire distribution plate 21 through the main gas outlet channel 201 to burn and form a main flame, and the other part of the mixed gas is output through the side gas outlet channels 202 on both sides and burns at the flame stabilization port to form a side flame. The side flames on both sides can stabilize the main flame on the fire distribution plate 21, further improving the combustion stability.

As shown in FIG. 2 and FIG. 5 , in one embodiment, a plurality of lateral convex bumps 11 may be provided at intervals along the length direction of the fire bar body 10 at positions opposite to each side plate 22, and the lateral convex bumps 11 may be formed by punching outward from the inner side of the fire bar body 10. A side air outlet channel 202 is formed between each lateral convex bump 11 and the side plate 22. In addition, a concave portion that is sunken toward the side plate 22 is formed between any two adjacent lateral convex bumps 11, and the concave portion can just abut against the side plate 22 and form a welding position, so as to weld the side plate 22 to the fire bar body 10.

As shown in FIG5 , in one embodiment, a first diverter port 203 is formed between the side of each side plate 22 away from the fire dividing plate 21 and the fire bar body 10, and the first diverter port 203 connects the airflow channel 101 with the side outlet channel 202. In this embodiment, a certain gap is formed between the side of the side plate 22 away from the fire dividing plate 21 (that is, the bottom side of the side plate 22) and the fire bar body 10, and the gap is the first diverter port 203. During the upward transportation of the mixed gas in the airflow channel 101, part of the gas can enter the side outlet channel 202 through the first diverter port 203, and then be transported to the flame stabilizing port through the side outlet channel 202 to burn and form a side flame, so as to stabilize the main flame on the fire dividing plate 21. Optionally, a guide slope is provided at a position corresponding to the first diversion port 203 of the fire bar body 10, and the guide slope extends from the first diversion port 203 toward the side air outlet channel 202 and is inclined upward. In this way, the airflow entering the first diversion port 203 can be better guided upward to the flame stabilizing port; and the guide slope can also guide the airflow from the first diversion port 203 to flow to the side wall of the fire bar body 10, and then the airflow can flow upward along the side wall to the flame stabilizing port, thereby avoiding the airflow speed through the side air outlet channel 202 being too fast, which is beneficial to further enhance the flame stabilizing effect.

As shown in Fig. 5, in one embodiment, each of the side plates 22 is provided with a second diverter port 221, and the second diverter port 221 connects the main gas outlet channel 201 with the side gas outlet channel 202. In this embodiment, each side plate 22 is provided with a second diverter port 221, and after the mixed gas in the airflow channel 101 is transported upward to the main gas outlet channel 201 between the two side plates 22, a part of it can continue to be transported upward to the combustion port 211 for combustion, and another part can enter the side gas outlet channel 202 through the second diverter port 221, and then be transported to the flame stabilization port through the side gas outlet channel 202 for combustion to form a side flame, so as to stabilize the main flame on the fire-dividing plate 21.

Among them, the number of second diversion ports 221 on each side panel 22 can be set according to actual needs, and can be single or multiple. Optionally, each side panel 22 is provided with multiple second diversion ports 221 at intervals along its length direction. For example, the position of the fire bar body 10 relative to each side panel 22 is provided with multiple lateral convex bumps 11 at intervals along its length direction, and a side air outlet channel 202 is formed between each lateral convex bump 11 and the side panel 22, then each side panel 22 can be provided with a single or multiple second diversion ports 221 at the position corresponding to the lateral convex bump 11. Among them, the shape of the second diversion ports 221 includes but is not limited to circular, square, long strip, triangle, trapezoidal or other special-shaped structures. When multiple second diversion ports 221 are provided on the side panel 22, the shapes of the multiple second diversion ports 221 can be the same or different. Exemplarily, as shown in Fig. 10, each side plate 22 is provided with a plurality of second diversion openings 221 along its length direction, wherein the second diversion openings 221 located at both sides are strip-shaped openings extending along the length direction of the side plate 22, and the second diversion openings 221 located in the middle are circular openings. Optionally, each side plate 22 is provided with a single strip-shaped second diversion opening 221 at a position corresponding to the side air outlet channels 202 located at both ends of the length direction of the fire bar body 10, and each side plate 22 is provided with three circular second diversion openings 221 arranged side by side at a position corresponding to the side air outlet channels 202 at other middle positions.

Optionally, as shown in Figure 5, in one embodiment, a first diversion port 203 is formed between the side of each side panel 22 facing away from the fire dividing plate 21 and the fire bar body 10, and each side panel 22 is provided with a second diversion port 221, and the second diversion port 221 connects the main air outlet channel 201 with the side air outlet channel 202.

In this embodiment, during the upward transportation of the mixed gas in the airflow channel 101, part of the gas can enter the side gas outlet channel 202 through the first diversion port 203, and the other part can enter the side gas outlet channel 202 through the second diversion port 221. In this way, the side of the fire grate 100 forms a graded gas outlet effect, which can ensure that under different load conditions, there is gas flowing out and burning (side flame) on the side of the fire grate 100. On the one hand, it has the effect of stabilizing the main flame, and on the other hand, it increases the amount of gas on the side, fully utilizes the space on the side of the fire grate 100, increases the total combustion area, and makes the nitrogen oxides NOx in the combustion exhaust lower. In general, NOx in gas water heaters is mainly generated due to high combustion temperature. The side flame shares part of the gas of the main flame, reduces the heat intensity of the fire hole in the main flame area, reduces the temperature in the main flame area, and effectively inhibits the generation of NOx.

As shown in Figures 2 to 5, in one embodiment, a plurality of lateral bulges 11 are provided at intervals along the length direction of the fire bar body 10 at a portion opposite to each of the side panels 22, and the air flow channel 101 is formed between each of the lateral bulges 11 and the adjacent side panel 22; the plurality of lateral bulges 11 opposite to the same side panel 22 include two end lateral bulges 11a respectively located at both ends, and a middle lateral bulge 11b located between the two end lateral bulges 11a; the first diversion port 203 is formed between the side of each side panel 22 away from the fire dividing plate 21 and each of the middle lateral bulges 11b; the second diversion port 221 is provided at a portion of each side panel 22 opposite to the end lateral bulges 11a and the middle lateral bulge 11b.

In this embodiment, due to the structural limitation of the fire bar body 10, the height of the end lateral convex bump 11a is lower than the height of the middle lateral convex bump 11b. In order to better match the airflow of the lateral convex bumps 11a at different positions, a first diversion port 203 is formed between the side of each side plate 22 away from the fire dividing plate 21 and each middle lateral convex bump 11b, and a second diversion port 221 is provided at the position opposite to each middle lateral convex bump 11b of each side plate 22, so that a secondary diversion effect can be formed at the position where the middle lateral convex bump 11b is located. However, the first diversion port 203 is not formed between the side of each side plate 22 away from the fire dividing plate 21 and each end lateral convex bump 11a, and only the second diversion port 221 is provided at the position opposite to each side lateral convex bump 11a of the side plate 22, that is, there is only a primary diversion at the position where the end lateral convex bump 11a is located. Optionally, the second flow diversion opening 221 corresponding to each end lateral convex bump 11a is set as a strip-shaped opening, which has a simple structure and is easy to manufacture. Optionally, the second flow diversion opening 221 corresponding to each middle lateral convex bump 11b is set as a circular opening, which has a simple structure and is easy to manufacture, and it is convenient to adjust the opening area and the number of openings as needed, thereby achieving air flow regulation. For example, each side plate 22 is provided with three circular second flow diversion openings 221 in parallel at the portion corresponding to each middle lateral convex bump 11b.

The utility model also proposes a combustion device, which includes a fire grate 100. The specific structure of the fire grate 100 refers to the above embodiment. Since the combustion device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

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

As an example, the combustion equipment may also be a gas water heater, a boiler or the like.

The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly/indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims (13)

1. A fire grate, characterized by comprising: The fire bar body has an air flow channel formed inside; The combustion head comprises a fire dividing plate arranged at the air outlet of the air flow channel, the fire dividing plate is provided with a plurality of combustion burners connected with the air flow channel, the side edge of the fire dividing plate is provided with flanges at positions corresponding to at least part of the combustion burners, and a gap is formed between at least part of the flanges and the corresponding side edges of the combustion burners; and A metal mesh is arranged on the combustion head and is arranged opposite to the plurality of combustion burners, and a part of the side edge of the metal mesh is located on the bottom side of the flange. 2. The fire grate as described in claim 1 is characterized in that a plurality of the combustion ports are arranged at intervals along the length direction of the fire dividing plate, and the two opposite side edges of the fire dividing plate along the width direction are provided with the flanges corresponding to the position of each of the combustion ports, and a gap is formed between each of the flanges and the side edge of the corresponding combustion port. 3. The fire bar according to claim 1, characterized in that the plurality of said combustion ports include a first combustion port and a second combustion port, the said fire dividing plate is provided with said flanges at two opposite side edges along the width direction thereof corresponding to the position of each of the first combustion ports, and the said notch is formed between each of the said flanges and the side edge of the corresponding first combustion port; The first combustion ports and the second combustion ports are arranged alternately and at intervals along the length direction of the fire dividing plate; or, at least two of the first combustion ports are arranged between any two adjacent second combustion ports. 4. The fire grate as described in claim 1 is characterized in that, in the length direction of the fire dividing plate, the fire dividing plate has a middle area and two end areas respectively located at both ends of the middle area, and the opening area of a single combustion port located in the end area is smaller than the opening area of a single combustion port located in the middle area. 5. The fire grate as described in claim 4 is characterized in that the fire dividing plate includes a plurality of longitudinal ribs arranged at intervals along its length direction, each of the longitudinal ribs extends along the width direction of the fire dividing plate, the combustion port is formed between any two adjacent longitudinal ribs, and the arrangement density of the longitudinal ribs located in the end area is greater than the arrangement density of the longitudinal ribs located in the middle area. 6. The fire grate as described in claim 1 is characterized in that the plurality of combustion ports located in the middle area of the fire dividing plate are arranged to form at least one row of flame ports, and each row of the flame ports includes third combustion ports and fourth combustion ports alternately arranged along the length direction of the fire dividing plate, and the opening area of the third combustion port is larger than the opening area of the fourth combustion port. 7. The fire grate as described in claim 6 is characterized in that at least two rows of the burner ports are arranged in the middle area of the fire dividing plate, and the at least two rows of the burner ports include a first burner port row and a second burner port row adjacent to each other in the width direction of the fire dividing plate, and the first burner port row and the second burner port row both include third combustion burners and fourth combustion burners alternately arranged along the length direction of the fire dividing plate, and the third combustion burner in the first burner port row is arranged opposite to the fourth combustion burner in the second burner port row. 8. The fire grate as described in claim 7 is characterized in that the fire dividing plate includes a plurality of transverse ribs arranged along the length direction thereof, each of the transverse ribs extends along the length direction of the fire dividing plate, any two adjacent transverse ribs are staggered in the width direction of the fire dividing plate, and the third combustion port and the fourth combustion port adjacent to each other in the width direction of the fire dividing plate are separated by the transverse ribs. 9. The fire grate according to claim 1, characterized in that at least part of the side edges of the combustion ports are provided with protrusions and/or grooves. 10. The fire grate as described in any one of claims 1 to 9 is characterized in that the combustion head also includes two side panels respectively arranged on both sides of the width direction of the fire dividing plate, the two side panels are bent and extended relative to the fire dividing plate toward the air flow channel, a main air outlet channel is formed between two adjacent side panels, the main air outlet channel connects the air flow channel with the plurality of combustion flames, a side air outlet channel connected to the air flow channel is formed between a side of each side panel facing away from the other side panel and the fire grate body, and the side of the side air outlet channel facing away from the air flow channel is open to form a flame stabilizing port. 11. The fire bar according to claim 10, characterized in that a first diversion port is formed between a side of each side plate away from the fire diversion plate and the fire bar body, and the first diversion port connects the air flow channel with the side air outlet channel; And/or, each of the side plates is provided with a second diversion port, and the second diversion port connects the main air outlet channel with the side air outlet channel. 12. The fire bar as described in claim 11 is characterized in that a plurality of lateral bulges are provided at intervals along the length direction of the fire bar body at a portion opposite to each of the side panels, and the air flow channel is formed between each of the lateral bulges and the adjacent side panel; the plurality of lateral bulges opposite to the same side panel include two end lateral bulges respectively located at both ends, and a middle lateral bulge located between the two end lateral bulges; the first diversion port is formed between a side of each side panel away from the fire dividing plate and each of the middle lateral bulges; the second diversion port is provided at a portion of each side panel opposite to the end lateral bulge and the middle lateral bulge. 13. A combustion device, characterized by comprising the fire bar according to any one of claims 1 to 12.